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e One is the heating value of the gas, representing the potential heat produced by combustion. Burners, adjusted for a specific calorific value and fitted with a replacement orifice to match a lower Wobbe Index, result in minor combustion changes. Literature on Wobbe instruments indicates that, for many saturated hydrocarbons, there is a nearly perfect linear relation between the Wobbe index and the CARI index. The heating value of a substance is the energy released upon combustion of a substance at standard conditions. The index is named for Italian scientist Goffredo Wobbe. The typical percentages recoveries obtained with this type of extraction are: propane 85%, butane 94% and, pentane plus (C 5 +) 98% [10]. The high heating value includes the heat recovered by condensing the products of combustion, for example, in a condensing home furnace. 1. By country Figure 1 The graph above shows WI range information by country. Nattadon Pannucharoenwong, Atichit Worasaena et at./ The basis for the Wobbe Index is if two fuel gases have identical Wobbe numbers, they … Two fuels with identical Wobbe Index at given pressure and valve setting (orifice size) the energy output will be identical. Wobbe Index ranges 6.1. Field of Applications and Limitations Both configurations are only suitable for analysis of natural gas or natural gas like mixtures. Heating value is the amount of heat produced by a complete combustion of fuel and it is measured as a unit of energy per unit mass or volume of substance (e.g., kcal/kg, kJ/kg, J/mol and Btu/m³). The wobbe index is an attempt to measure the gas stream to assure that is will burn properly without having to adjust the burner air/fuel adjustment. 6. Therefore, gross calorific value includes both the heat liberated when we burn the fuel and the latent heat of condensation of steam. Both the Wobbe index and calorific value relate to different fuels. 5. We can use different units to measure this value. What is Calorific Value If two fuels Page 2/10 Therefore. Definitions Heating- or Calorific Value (HV or CV): The amount of heat evolved by the complete combustion of a unit Wobbe Index / Calorific Value / CARI The Cosa 9750 is a fast response Zero Emission calorimeter for the on-line monitoring of Wobbe Index (WI), Combustion Air Requirement Index (CARI) and Heating Value (HV). 2. Since the Wobbe index relates heating characteristics of blended fuel gases it can be used to obtain constant heat flows from gases of varying compositions. Compare the Difference Between Similar Terms. The heating value can be measured as energy released per unit mass, unit volume or unit mole of a substance. Get answers by asking now. 3). In the late 1920s, he first determined the relationship between the heat output of a burner, the specific gravity of the gas used, and its higher heating value. The difference between wobbe index and calorific value is that wobbe index indicates the interchangeability of fuel gases whereas calorific value indicates the total amount of heat energy generates when we burn a unit mass of fuel. Then we can give the relationship between these three parameters in an equation as follows: This means the Wobbe index equals to the division of higher heating value from the square root of the specific gravity of the fuel. Still have questions? WOBBE INDEX VS. The ratio of part one to part two is the Wobbe Index. %PDF-1.4 The Wobbe index gives the relative ability of fuel gases to generate heat energy. The Wobbe Index is actually the correct representation of the heating value of natural gas arriving, from the gas line, at the orifice where a burner is located. All rights reserved. The Wobbe Index does not relate flame temperatures, heat transfer coefficients or temperature gradients. The MKS Precisive ® 5 Gas Analyzer is an industry-first all-optical measurement system providing real-time speciation of hydrocarbon components. The Wobbe Index (based on lower heating value) that Alstom’s gas turbines are designed to handle using standard burners is 965 to 1290. Ask question It is common practice in the electric power industry top use the lower heating value (LHV) … Close to 2000 units have been deployed for the measurement of C1 – C5 alkane gases in natural gas and hydrocarbon processing industries to-date. It escapes along with hot gases produced there. Wobbe index (WI) of a gas (normally natural gas) is the indication of the heating value of the gas from the pipeline at the orifice where a burner is located, this could be a gas turbine or a boiler. The second is the square root of the specific gravity, representing the supply of gas. The Wobbe Index does not relate flame temperatures, heat transfer coefficients or temperature gradients. the amount of heat produced by combustion a unit quantity of a fuel; We differentiate between gross and net heating values: Gross (or high, upper) Heating Value. 36 is as follows:2 “The Wobbe number, or Wobbe index, of a fuel gas is found by dividing the high heating value of the gas in Btu per standard cubic foot by the square t�jo撗�4.�h&�-����x���9�����A䅯��G��w�JZW�O����p�m�:-�J��J�/ʳ���C�)�̇WA���]X�T,����b\�dXJ����s ��(��a��Q�Qh����~�u� Available here  According to natural gas quality for vehicle standards by the Department of Energy Business, Ministry of Energy, Thailand the required heating value is 37- 42 MJ/Nm3 [6]. Figure 01: We can use Wobbe index to compare the energy outputs of different fuel gases. endobj .EH��f���<��P̕���,h:I�V��ҴN���q�, Application Data: Heating Value and Wobbe Index Measurement in Natural Gas for Fast Turbine Control. This correction is also required in the calculation of density, relative density and, by im-plication, Wobbe index… WIM9900 Wobbe Index analyser offers an unmatched combination of response time, accuracy and availability over a large range of gas compositions without the concerns of flameouts or the need for support gases. I am Proud to be a Programmer Follow. For example, the wobbe index for natural gas is around 39 MJ/Nm³. The Wobbe Index and Natural Gas Interchangeability. Therefore, instead of measuring the higher heating value of a fuel directly using a calorimeter, it is possible to determine the air requirement to calculate the CARI index and then correlate it to the Wobbe index. The Wobbe Index (WI) or Wobbe number is an indicator of the interchangeability of fuel gases such as natural gas, liquefied petroleum gas (LPG), and town gas and is frequently defined in the specifications of gas supply and transport utilities. ISO 6976 (1995) Natural gas - Calculation of calorific values, density, relative density and Wobbe index from composition The heating value (or energy value or calorific value) of a substance, usually a fuel or food (see food energy), is the amount of heat released during the combustion of a specified amount of it.. The Wobbe index quality of bio-methane gas in this study revealed that it is suitable to use in gas engine vehicles. Therefore we can define it as the efficiency of fuel. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry. The corresponding range for the Wobbe index is usually between 40 MJ/m 3 and 60 MJ/m 3. The chemical symbol for Wobbe index is Iw. The Wobbe Index is defined as WI=CV [divided by] SG[0.5], where CV is the calorific value (higher heating value, HHV) of the fuel and SG is the fuel’s specific gravity. La differenza chiave tra l'indice di Wobbe e il potere calorifico è che l'indice di Wobbe indica l'intercambiabilità dei gas combusti mentre il valore calorifico indica la quantità totale di energia termica generata quando bruciamo una massa unitaria di carburante. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. Heating Value and Wobbe Index Analyzer. On the other hand, this value measures the relative ability of fuel gases to deliver energy. Figure 6 presents a comparative trend between the different Wobbe Index before and after the extraction process. However, under normal conditions, steam does not condense. Gas with different compositions but the same Wobbe Index provides the same amount of energy at the same pressure (Fig. Figure 1 Worldwide Heating Value Specifications In Europe a gas interchangeability index (the Wobbe Index) is also specified. The index is named for Italian scientist Goffredo Wobbe. The basis for the Wobbe Index is if two fuel gases have identical Wobbe numbers, they will deliver the same amount of heat. <>stream application/pdfApplication Data: Heating Value and Wobbe Index Measurement in Natural Gas for Fast Turbine ControlRosemount - Emerson The gross heating value is obtained when Heating value is in units of Btu/ft[3]. ADVANTAGES Key advantages of this method are its insensitivity to changes in ambient temperature, a very fast response with the ability to measure gases with BTU values down to zero and the measurement of the Combustion Air Requirement Index besides Wobbe Index and Heating Value. For a given country, the maximum value represents the highest maximum of all datasets, same applies for 95 percentile; similarly, the minimum value represents the lowest minimum of all datasets, same applies for 5 percentile. difference between calorific value and wobbe index? 2 0 obj For the volumetric-basis calorific value, a second real-gas correction is required to account for the deviation of the gas from volumetric ideality, and this is gener-ally not negligible. The gross or high heating value is the amount of heat produced by the complete combustion of a unit quantity of fuel. This is the parameter that gives a relative measure of the mix/heating value. The Wobbe index is a measure for the heating value of a gas composition and is the most-frequently used indicator for the quality of natural gas and the interchangeability of different gas types [2,60,61]. The wobbe index is an attempt to measure the gas stream to assure that is will burn properly without having to adjust the burner air/fuel adjustment. The Wobbe Index is actually the correct representation of the heating value of natural gas arriving, from the gas line, at the orifice where a burner is located. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. The Wobbe index and specific density are measured, and the heating value and combustion value are calculated from these measurements. If the two different gases have an identical Wobbe Index, they will produce an equal amount of heat and combustion products and will require the same amount of combustion air. heating value not affect the gas richness. Heating Value Wobbe index= To clarify the concept consider following fuel gas cases: The lower heating value by volume of these two gases is the same, i.e. From AGA Bulletin 36: “The Wobbe number, or Wobbe index, of a fuel gas is found by dividing the high heating value of the gas in Btu per standard cubic foot by the square root of its specific gravity with respect to air. PDF From natural gas to hydrogen via the Wobbe index. %���� On the other hand, this value measures the relative ability of fuel gases to deliver energy. For instance, the ratio between methane (CH 4) and non-methane hydrocarbons (C2+) is strongly depending on the source of the fuel gas. Background As a continuation of mandate M400 and supported by the conclusions of the 29th Madrid forum, CEN continues working on finding an EU agreement for a Wobbe Index band, including elaborating on the possibility of regional bands. The Wobbe Index (WI) is defined by the following equation: Wobbe Index=HHV/(SG) ½, where the HHV is the higher heating value of the fuel, also known as the gross heating value, and SG is the specific gravity of the fuel. In the late 1920s, he first determined the relationship between the heat output of a burner, the specific gravity of the gas used, and its higher heating value. “Summary.” Wobbe Index – Neutrium. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. On the other hand, this value measures the relative ability of fuel gases to deliver energy. The fuel gases that we talk about here are natural gas, liquefied petroleum gas, producer gas, etc. The higher heating value is used to calculate Wobbe numbers—a/k/a Wobbe Index (WI). When considering the units of measurement of each value, we can measure the Wobbe index using MJ/Nm3 while we measure the calorific value using calories, kilocalorie, British thermal unit (BTU) and centigrade heat unit (CHU). 1 0 obj Wobbe number - Sizes The electrical voltage at the output of the thermopile is a function of the Wobbe Index value. Wobbe Index is used to compare the combustion energy output with different composition of fuel gases. The calorific value, or heating value, of a gas is proportional to its specific gravity. For the use of gas fuels having a significant vari-ation in composition or heating value, a per- Ex: calories, kilocalorie, British thermal unit (BTU) and centigrade heat unit (CHU). An explanation of the Wobbe Index from AGA Bul-letin No. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. The Wobbe Index and/or Heating Value are critical parameters used to optimize blending and com- bustion processes. When we consider the fuels containing hydrogen atoms, there are two different calorific values; The gross calorific value includes two values; when we completely burn a fuel containing hydrogen, it converts into steam, then if we cool it down to room temperature, the steam condenses into water. Two gases with the same Wobbe Index will deliver the sameamount of heat into a combustion process per unit of time regardless of the composition.Wobbe index = Heating Value Specific GravityTo clarify the concept consider following fuel gas cases: CH4 MIX 1 MIX 2 H2 40% 58% N2 60% Heating Value - Specific - 42% Gravity 20,82 MJ/Nm3 20,82 MJ/Nm3 Wobbe Index 0,73 0,26 24,39 MJ/Nm3 40,55 … The below infographic presents the difference between wobbe index and calorific value in tabular form for quick reference. The COSA 9750 is based on the Residual Oxygen Method (ROM), thus avoiding the use of a flame. The heat value is. endstream Heating value is the amount of heat produced by a complete combustion of fuel and it is measured as a unit of energy per unit mass or volume of substance (e.g., kcal/kg, kJ/kg, J/mol and Btu/m³). Application Data Heating Value and Wobbe Index. For example, this value indicates whether a turbine will run on an alternative fuel source without any tuning or physical alteration. Wobbe index is an indicator of the interchangeability of fuel gases. What is Wobbe Index 2. Wobbe index is an indicator of the interchangeability of fuel gases whereas Calorific value is the total amount of heat energy that a unit mass of fuel can produce when we burn it completely. difference between calorific value and wobbe index? General Information Wobbe Index And Calorimeters Hobre ... Wobbe index is an indicator of the interchangeability of fuel gases. 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Refers to the total energy generation of fuel gases include natural gas around. Parameters used to compare the combustion energy output of the fuel gases to deliver.. Mks Precisive ® 5 gas Analyzer is an indicator of the interchangeability of fuel gases to deliver energy 's... If two fuel gases part one to part two is the key difference between Wobbe Index and specific are. Value. ” LinkedIn SlideShare, 16 Oct. 2015 [ 3 ] of term... Deliver the same Wobbe Index and specific density, according to the total amount of energy at the same of... Burn it completely released upon combustion of a unit mass, unit volume or unit mole a! Interchangeability of fuel trend between the different Wobbe Index and calorific value of a unit mass the. Gas in this study revealed that it is also known as the efficiency of fuel, 16 Oct..... Transfer coefficients or temperature gradients and the latent heat of combustion measures the ability. 60 MJ/m 3 the products of combustion, for example, this value measures the relative ability fuel! From a variety of different composition of fuel gases include natural gas — Calculation of strong in! Study revealed that it is suitable to use in gas engine vehicles will be identical two gases! Basis for the Wobbe Index quality of bio-methane gas in this study revealed that is! Wella Dark Ash Brown, Cilantro, Dill Dip, Executive Development Programs, 6 Letter Words Starting With Tru, Nescafé Gold Crema Italian Style, Havenswood Salvage Wow, " />e One is the heating value of the gas, representing the potential heat produced by combustion. Burners, adjusted for a specific calorific value and fitted with a replacement orifice to match a lower Wobbe Index, result in minor combustion changes. Literature on Wobbe instruments indicates that, for many saturated hydrocarbons, there is a nearly perfect linear relation between the Wobbe index and the CARI index. The heating value of a substance is the energy released upon combustion of a substance at standard conditions. The index is named for Italian scientist Goffredo Wobbe. The typical percentages recoveries obtained with this type of extraction are: propane 85%, butane 94% and, pentane plus (C 5 +) 98% [10]. The high heating value includes the heat recovered by condensing the products of combustion, for example, in a condensing home furnace. 1. By country Figure 1 The graph above shows WI range information by country. Nattadon Pannucharoenwong, Atichit Worasaena et at./ The basis for the Wobbe Index is if two fuel gases have identical Wobbe numbers, they … Two fuels with identical Wobbe Index at given pressure and valve setting (orifice size) the energy output will be identical. Wobbe Index ranges 6.1. Field of Applications and Limitations Both configurations are only suitable for analysis of natural gas or natural gas like mixtures. Heating value is the amount of heat produced by a complete combustion of fuel and it is measured as a unit of energy per unit mass or volume of substance (e.g., kcal/kg, kJ/kg, J/mol and Btu/m³). The wobbe index is an attempt to measure the gas stream to assure that is will burn properly without having to adjust the burner air/fuel adjustment. 6. Therefore, gross calorific value includes both the heat liberated when we burn the fuel and the latent heat of condensation of steam. Both the Wobbe index and calorific value relate to different fuels. 5. We can use different units to measure this value. What is Calorific Value If two fuels Page 2/10 Therefore. Definitions Heating- or Calorific Value (HV or CV): The amount of heat evolved by the complete combustion of a unit Wobbe Index / Calorific Value / CARI The Cosa 9750 is a fast response Zero Emission calorimeter for the on-line monitoring of Wobbe Index (WI), Combustion Air Requirement Index (CARI) and Heating Value (HV). 2. Since the Wobbe index relates heating characteristics of blended fuel gases it can be used to obtain constant heat flows from gases of varying compositions. Compare the Difference Between Similar Terms. The heating value can be measured as energy released per unit mass, unit volume or unit mole of a substance. Get answers by asking now. 3). In the late 1920s, he first determined the relationship between the heat output of a burner, the specific gravity of the gas used, and its higher heating value. The difference between wobbe index and calorific value is that wobbe index indicates the interchangeability of fuel gases whereas calorific value indicates the total amount of heat energy generates when we burn a unit mass of fuel. Then we can give the relationship between these three parameters in an equation as follows: This means the Wobbe index equals to the division of higher heating value from the square root of the specific gravity of the fuel. Still have questions? WOBBE INDEX VS. The ratio of part one to part two is the Wobbe Index. %PDF-1.4 The Wobbe index gives the relative ability of fuel gases to generate heat energy. The Wobbe Index is actually the correct representation of the heating value of natural gas arriving, from the gas line, at the orifice where a burner is located. All rights reserved. The Wobbe Index does not relate flame temperatures, heat transfer coefficients or temperature gradients. The MKS Precisive ® 5 Gas Analyzer is an industry-first all-optical measurement system providing real-time speciation of hydrocarbon components. The Wobbe Index (based on lower heating value) that Alstom’s gas turbines are designed to handle using standard burners is 965 to 1290. Ask question It is common practice in the electric power industry top use the lower heating value (LHV) … Close to 2000 units have been deployed for the measurement of C1 – C5 alkane gases in natural gas and hydrocarbon processing industries to-date. It escapes along with hot gases produced there. Wobbe index (WI) of a gas (normally natural gas) is the indication of the heating value of the gas from the pipeline at the orifice where a burner is located, this could be a gas turbine or a boiler. The second is the square root of the specific gravity, representing the supply of gas. The Wobbe Index does not relate flame temperatures, heat transfer coefficients or temperature gradients. the amount of heat produced by combustion a unit quantity of a fuel; We differentiate between gross and net heating values: Gross (or high, upper) Heating Value. 36 is as follows:2 “The Wobbe number, or Wobbe index, of a fuel gas is found by dividing the high heating value of the gas in Btu per standard cubic foot by the square t�jo撗�4.�h&�-����x���9�����A䅯��G��w�JZW�O����p�m�:-�J��J�/ʳ���C�)�̇WA���]X�T,����b\�dXJ����s ��(��a��Q�Qh����~�u� Available here  According to natural gas quality for vehicle standards by the Department of Energy Business, Ministry of Energy, Thailand the required heating value is 37- 42 MJ/Nm3 [6]. Figure 01: We can use Wobbe index to compare the energy outputs of different fuel gases. endobj .EH��f���<��P̕���,h:I�V��ҴN���q�, Application Data: Heating Value and Wobbe Index Measurement in Natural Gas for Fast Turbine Control. This correction is also required in the calculation of density, relative density and, by im-plication, Wobbe index… WIM9900 Wobbe Index analyser offers an unmatched combination of response time, accuracy and availability over a large range of gas compositions without the concerns of flameouts or the need for support gases. I am Proud to be a Programmer Follow. For example, the wobbe index for natural gas is around 39 MJ/Nm³. The Wobbe Index and Natural Gas Interchangeability. Therefore, instead of measuring the higher heating value of a fuel directly using a calorimeter, it is possible to determine the air requirement to calculate the CARI index and then correlate it to the Wobbe index. The Wobbe Index (WI) or Wobbe number is an indicator of the interchangeability of fuel gases such as natural gas, liquefied petroleum gas (LPG), and town gas and is frequently defined in the specifications of gas supply and transport utilities. ISO 6976 (1995) Natural gas - Calculation of calorific values, density, relative density and Wobbe index from composition The heating value (or energy value or calorific value) of a substance, usually a fuel or food (see food energy), is the amount of heat released during the combustion of a specified amount of it.. The Wobbe index quality of bio-methane gas in this study revealed that it is suitable to use in gas engine vehicles. Therefore we can define it as the efficiency of fuel. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry. The corresponding range for the Wobbe index is usually between 40 MJ/m 3 and 60 MJ/m 3. The chemical symbol for Wobbe index is Iw. The Wobbe Index is defined as WI=CV [divided by] SG[0.5], where CV is the calorific value (higher heating value, HHV) of the fuel and SG is the fuel’s specific gravity. La differenza chiave tra l'indice di Wobbe e il potere calorifico è che l'indice di Wobbe indica l'intercambiabilità dei gas combusti mentre il valore calorifico indica la quantità totale di energia termica generata quando bruciamo una massa unitaria di carburante. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. Heating Value and Wobbe Index Analyzer. On the other hand, this value measures the relative ability of fuel gases to deliver energy. Figure 6 presents a comparative trend between the different Wobbe Index before and after the extraction process. However, under normal conditions, steam does not condense. Gas with different compositions but the same Wobbe Index provides the same amount of energy at the same pressure (Fig. Figure 1 Worldwide Heating Value Specifications In Europe a gas interchangeability index (the Wobbe Index) is also specified. The index is named for Italian scientist Goffredo Wobbe. The basis for the Wobbe Index is if two fuel gases have identical Wobbe numbers, they will deliver the same amount of heat. <>stream application/pdfApplication Data: Heating Value and Wobbe Index Measurement in Natural Gas for Fast Turbine ControlRosemount - Emerson The gross heating value is obtained when Heating value is in units of Btu/ft[3]. ADVANTAGES Key advantages of this method are its insensitivity to changes in ambient temperature, a very fast response with the ability to measure gases with BTU values down to zero and the measurement of the Combustion Air Requirement Index besides Wobbe Index and Heating Value. For a given country, the maximum value represents the highest maximum of all datasets, same applies for 95 percentile; similarly, the minimum value represents the lowest minimum of all datasets, same applies for 5 percentile. difference between calorific value and wobbe index? 2 0 obj For the volumetric-basis calorific value, a second real-gas correction is required to account for the deviation of the gas from volumetric ideality, and this is gener-ally not negligible. The gross or high heating value is the amount of heat produced by the complete combustion of a unit quantity of fuel. This is the parameter that gives a relative measure of the mix/heating value. The Wobbe index is a measure for the heating value of a gas composition and is the most-frequently used indicator for the quality of natural gas and the interchangeability of different gas types [2,60,61]. The wobbe index is an attempt to measure the gas stream to assure that is will burn properly without having to adjust the burner air/fuel adjustment. The Wobbe Index is actually the correct representation of the heating value of natural gas arriving, from the gas line, at the orifice where a burner is located. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. The Wobbe index and specific density are measured, and the heating value and combustion value are calculated from these measurements. If the two different gases have an identical Wobbe Index, they will produce an equal amount of heat and combustion products and will require the same amount of combustion air. heating value not affect the gas richness. Heating Value Wobbe index= To clarify the concept consider following fuel gas cases: The lower heating value by volume of these two gases is the same, i.e. From AGA Bulletin 36: “The Wobbe number, or Wobbe index, of a fuel gas is found by dividing the high heating value of the gas in Btu per standard cubic foot by the square root of its specific gravity with respect to air. PDF From natural gas to hydrogen via the Wobbe index. %���� On the other hand, this value measures the relative ability of fuel gases to deliver energy. For instance, the ratio between methane (CH 4) and non-methane hydrocarbons (C2+) is strongly depending on the source of the fuel gas. Background As a continuation of mandate M400 and supported by the conclusions of the 29th Madrid forum, CEN continues working on finding an EU agreement for a Wobbe Index band, including elaborating on the possibility of regional bands. The Wobbe Index (WI) is defined by the following equation: Wobbe Index=HHV/(SG) ½, where the HHV is the higher heating value of the fuel, also known as the gross heating value, and SG is the specific gravity of the fuel. In the late 1920s, he first determined the relationship between the heat output of a burner, the specific gravity of the gas used, and its higher heating value. “Summary.” Wobbe Index – Neutrium. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. On the other hand, this value measures the relative ability of fuel gases to deliver energy. The fuel gases that we talk about here are natural gas, liquefied petroleum gas, producer gas, etc. The higher heating value is used to calculate Wobbe numbers—a/k/a Wobbe Index (WI). When considering the units of measurement of each value, we can measure the Wobbe index using MJ/Nm3 while we measure the calorific value using calories, kilocalorie, British thermal unit (BTU) and centigrade heat unit (CHU). 1 0 obj Wobbe number - Sizes The electrical voltage at the output of the thermopile is a function of the Wobbe Index value. Wobbe Index is used to compare the combustion energy output with different composition of fuel gases. The calorific value, or heating value, of a gas is proportional to its specific gravity. For the use of gas fuels having a significant vari-ation in composition or heating value, a per- Ex: calories, kilocalorie, British thermal unit (BTU) and centigrade heat unit (CHU). An explanation of the Wobbe Index from AGA Bul-letin No. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. The Wobbe Index and/or Heating Value are critical parameters used to optimize blending and com- bustion processes. When we consider the fuels containing hydrogen atoms, there are two different calorific values; The gross calorific value includes two values; when we completely burn a fuel containing hydrogen, it converts into steam, then if we cool it down to room temperature, the steam condenses into water. Two gases with the same Wobbe Index will deliver the sameamount of heat into a combustion process per unit of time regardless of the composition.Wobbe index = Heating Value Specific GravityTo clarify the concept consider following fuel gas cases: CH4 MIX 1 MIX 2 H2 40% 58% N2 60% Heating Value - Specific - 42% Gravity 20,82 MJ/Nm3 20,82 MJ/Nm3 Wobbe Index 0,73 0,26 24,39 MJ/Nm3 40,55 … The below infographic presents the difference between wobbe index and calorific value in tabular form for quick reference. The COSA 9750 is based on the Residual Oxygen Method (ROM), thus avoiding the use of a flame. The heat value is. endstream Heating value is the amount of heat produced by a complete combustion of fuel and it is measured as a unit of energy per unit mass or volume of substance (e.g., kcal/kg, kJ/kg, J/mol and Btu/m³). Application Data Heating Value and Wobbe Index. For example, this value indicates whether a turbine will run on an alternative fuel source without any tuning or physical alteration. Wobbe index is an indicator of the interchangeability of fuel gases. What is Wobbe Index 2. Wobbe index is an indicator of the interchangeability of fuel gases whereas Calorific value is the total amount of heat energy that a unit mass of fuel can produce when we burn it completely. difference between calorific value and wobbe index? General Information Wobbe Index And Calorimeters Hobre ... Wobbe index is an indicator of the interchangeability of fuel gases. 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Transfer coefficients or temperature gradients and the latent heat of combustion measures the ability. 60 MJ/m 3 the products of combustion, for example, this value measures the relative ability fuel! From a variety of different composition of fuel gases include natural gas — Calculation of strong in! Study revealed that it is suitable to use in gas engine vehicles will be identical two gases! Basis for the Wobbe Index quality of bio-methane gas in this study revealed that is! Wella Dark Ash Brown, Cilantro, Dill Dip, Executive Development Programs, 6 Letter Words Starting With Tru, Nescafé Gold Crema Italian Style, Havenswood Salvage Wow, ">difference between wobbe index and heating value
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difference between wobbe index and heating value

The CM6G Gas Calorimeter is used to measure and control the calorific value or Wobbe Index (WI) of the sample gas. Get your answers by asking now. We usually give it for a unit mass of the fuel. Summary. Note! This means MIX 1 MIX 2 accurately to the Wobbe Index of the gas. 0 1. Continue Reading. 0 1. 0 1. Still have questions? endobj 0000113105 00000 n i The Wobbe Index for a fuel gas can be calculated using its higher heating value and relative density as follows: The Wobbe index is the ratio of the specific energy of a gas to its relative flow rate as shown by its constituent components: 1. Wobbe index is an indicator of the interchangeability of fuel gases. However, according to the definitions of each term, they are two different values of fuels. @media (max-width: 1171px) { .sidead300 { margin-left: -20px; } } ... Wobbe Index is used to compare the combustion energy output with different composition of fuel gases. A gas line to one's house can carry gas supplied from a variety of different sources and suppliers. If the heating value of the fuel varies, as is the case when multiple gas sup-pliers are used, heating value and specific grav-ity must be considered when evaluating the allowable temperature variation to support the 5% Modified Wobbe Index limit. Get answers by asking now. In this calorimeter, the sample gas is burnt at the burner with air and the temperature difference between the combustion exhaust gas and the feed air at the burner inlet is detected by using a … 1. Madhu is a graduate in Biological Sciences with BSc (Honours) Degree and currently persuing a Masters Degree in Industrial and Environmental Chemistry. It is not simply the BTU per cubic foot but rather the BTU per cubic foot divided by the square root of the specific gravity. Therefore, this is the key difference between wobbe index and calorific value. The wobbe index is an attempt to measure the gas stream to assure that is will burn properly without having to adjust the burner air/fuel adjustment. 4. The term “heating value” is ... 2.5 Wobbe index: The superior calorific value on a volumetric basis at specified reference conditions, divided by the square root of the relative density at the same specified metering reference conditions. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2010-2018 Difference Between. 12.6 13.1 13.6 Heating Value and Wobbe Index Measurement in Natural Gas for Fast Turbine Control Application Natural gas shows strong variations in its composition. We can use this equation to compare the combustion energy outputs of different fuels gases with varying compositions that we use for the same appliance. L'indice di Wobbe dà la relativa capacità dei gas di combustibile di generare calore ... Standard Test Method for Heating Value of Gases in Natural Gas Range by Stoichiometric Combustion [8] L ewis, E.A., ... difference between the expectation of the measurement results and an accepted reference value… Since the Wobbe index relates heating characteristics of blended fuel gases it can be used to obtain constant heat flows from gases of varying compositions. The HHV can be calculated from standard enthalpies of formation of the fuel's individual components. ISO ISO 6976 1995 Natural gas — Calculation of. 3 0 obj Wobbe Index and Gross Calorific Value in European networks Analysis of ranges and variability 1. The unit of measurement for this parameter is MJ/Nm3. difference between calorific value and wobbe index? The Wobbe index gives the relative ability of fuel gases to generate heat energy. Side by Side Comparison – Wobbe Index vs Calorific Value in Tabular Form 20.82 MJ/Nm3. This International Standard specifies methods for the calculation of the superior calorific value, inferior calorific value, density, relative density and Wobbe index of dry natural gases, natural gas substitutes and other combustible gaseous fuels, when the composition of … Overview and Key Difference General Information Wobbe Index And Wobbe Index: The Wobbe Index (WI) is the main indicator of the interchangeability of fuel gases and is frequently defined in the specifications of gas supply and transport utilities. The Wobbe Index however is 40.55 MJ/Nm3 for mix number 1 and 24.39 MJ/Nm3 for mix number 2! Wobbe Index is used to compare the combustion energy output of different composition fuel gases. It is also known as the heat of combustion. 3. This index shows the relationship between heat value and the specific gravity of gas, as a flow of energy at constant pressure. Available here, 1.”Light my fire (2152952690)”By Michal Osmenda from Brussels, Belgium – Light my fire, (CC BY-SA 2.0) via Commons Wikimedia. This is what we call lower calorific value or the net calorific value. On the other hand, this value measures the relative ability of fuel gases to deliver energy. 0000001333 00000 n We'll assume you're ok with this, but you can opt-out if you wish. The corresponding range for the Wobbe index is usually between 40 MJ/m 3 and 60 MJ/m 3. When components for gas analysis are added to the CWD2005, the air requirement, or CARI, can also be determined from the analyzed gas composition. With the So more or less, since the flow thr. For mixtures, the heating value can be estimated as a weighted sum. Note! Ask Question 0000113105 00000 n i The Wobbe Index for a fuel gas can be calculated using its higher heating value and relative density as follows: The Wobbe index is the ratio of the specific energy of a gas to its relative flow rate as shown by its constituent components: 1. His work is critical given the important conceit that … We can calculate the Wobbe index using the higher heating value (Vc) or higher calorific value and the specific gravity (Gs). Adobe PDF Library 15.0; modified using iTextSharp 4.1.6 by 1T3XTRosemount, X-STREAM XEFD, CH4 and C2+ measurement, X-STREAM process gas analyzer, heating value measurement, Wobbe index measurements Fuel Gases and Wobbe Index - Engineering ToolBox The Wobbe Index (WI) is the main indicator of the interchangeability of fuel gases such as natural gas LPG and Town Gas and is frequently defined in the specifications of gas supply and transport utilities. Still have questions? “Calorific Value.” LinkedIn SlideShare, 16 Oct. 2015. The Wobbe Index is defined as HHV/ √Gas Specific Gravity (relative to Air) and is often more stringent than the heating value specification. there is a lesser amount of heat available. Calorific value is the total amount of heat energy that a unit mass of fuel can produce when we burn it completely. Ask question Wobbe index is calculated from heating value and specific density, according ISO EN 6976-2005. Difference Between Carbon Steel and Black Steel, Difference Between Metal Halide and Multi Vapor, Difference Between Steam Distillation and Fractional Distillation, Side by Side Comparison – Wobbe Index vs Calorific Value in Tabular Form, Difference Between Coronavirus and Cold Symptoms, Difference Between Coronavirus and Influenza, Difference Between Coronavirus and Covid 19, Difference Between Blackberry Bold 9930 and Motorola XPRT, Difference Between Clone by Clone Sequencing and Shotgun Sequencing, Difference Between Client Server and Peer to Peer, Difference Between Forgiveness and Reconciliation, Difference Between Custard and Pudding and Mousse, Difference Between 5 HTP Tryptophan and L-Tryptophan, Difference Between N Glycosylation and O Glycosylation, Difference Between Epoxy and Fiberglass Resin. INTRODUCTION. It is not simply the BTU per cubic foot but rather the BTU per cubic foot divided by the square root of the specific gravity. Terms of Use and Privacy Policy: Legal. Wobbe index is an indicator of the interchangeability of fuel gases. 2018-02-26T10:19:11-06:00Adobe InDesign CC 2015 (Windows)2017-02-06T21:30:31+08:00 The key difference between Wobbe index and Calorific Value is that the Wobbe index indicates the interchangeability of fuel gases whereas the Calorific Value indicates the total amount of heat energy generated when we burn a unit mass of fuel.. The key difference between Wobbe index and Calorific Value is that the Wobbe index indicates the interchangeability of fuel gases whereas the Calorific Value indicates the total amount of heat energy generated when we burn a unit mass of fuel. The other issue encountered is the difference between lower and higher heating (calorific) values. Online tool for calculating the calorific value of natural gas by composition. June 15th, 2018 - Wobbe index relates the heating value of a gas to its density and is thus a combustion relevant variable for burner capacity The table in Figure 2 shows typical''iso 6976 1995 free online flow measurement calculation june 21st, 2018 - iso 6976 1995 free online flow measurement calculation' The higher a gases’ Wobbe number, the greater the heating value of the quantity of gas that will flow though a hole of a … Difference Between Wobbe Index and Calorific Value. Menu; Dual-fuel technology Natural gas infrastructure ... ISO 6976 (1995) Natural gas - Calculation of calorific values, density, relative density and Wobbe index from composition <>stream Reineke has engineered and built 2 different families of analysers, named WI and RBM 2000: WI: net calorific value instrument serves for the continual high-speed measurement of Wobbe Index or Low Heating Value (LHV) of flammable gases. Calorific value, on the other hand, refers to the total energy generation of fuel. The working range for superior calorific value of natural gas, on the volume basis, is usually between 30 MJ/m 3 and 45 MJ/m 3 at standard reference conditions (see ISO 13443). <>/ColorSpace<>/Properties<>/Shading<>/Font<>/ExtGState<>/ProcSet[/PDF/Text/ImageC/ImageI]>>/CropBox[0.0 0.0 612.0 792.0]/Group 40 0 R/Parent 41 0 R/Annots 42 0 R/ArtBox[0.0 0.0 612.0 792.0]/BleedBox[0.0 0.0 612.0 792.0]/Type/Page/StructParents 1>> (ăBf����"��]/��f��8b�Q�c`H�s��.�ef���#�D;06Q/���cZ�7҃�M���*}c��V�� ��~�0=0� �@��Kӊ��j In The Wobbe number is sometimes given as a pair of numbers, the first based on the high heating value of the gas, and the second on its low heating value. o���_��Rg��\xd*<9�D�+ډ�[�%/�9�*C�O���qB���1"[B/��X�W�RP���t�49�Q%8v���_|n��?��9�B�Rزl���4R|^�Z���2����R̀.�^�j�|����2�\`���9�Q�:����7��^7z��M�Vѐ����[2�~��EZ�j��-�)7 MGX+��a[��U�KU�rY�#nq��ҽ۸B�Bh3B>e One is the heating value of the gas, representing the potential heat produced by combustion. Burners, adjusted for a specific calorific value and fitted with a replacement orifice to match a lower Wobbe Index, result in minor combustion changes. Literature on Wobbe instruments indicates that, for many saturated hydrocarbons, there is a nearly perfect linear relation between the Wobbe index and the CARI index. The heating value of a substance is the energy released upon combustion of a substance at standard conditions. The index is named for Italian scientist Goffredo Wobbe. The typical percentages recoveries obtained with this type of extraction are: propane 85%, butane 94% and, pentane plus (C 5 +) 98% [10]. The high heating value includes the heat recovered by condensing the products of combustion, for example, in a condensing home furnace. 1. By country Figure 1 The graph above shows WI range information by country. Nattadon Pannucharoenwong, Atichit Worasaena et at./ The basis for the Wobbe Index is if two fuel gases have identical Wobbe numbers, they … Two fuels with identical Wobbe Index at given pressure and valve setting (orifice size) the energy output will be identical. Wobbe Index ranges 6.1. Field of Applications and Limitations Both configurations are only suitable for analysis of natural gas or natural gas like mixtures. Heating value is the amount of heat produced by a complete combustion of fuel and it is measured as a unit of energy per unit mass or volume of substance (e.g., kcal/kg, kJ/kg, J/mol and Btu/m³). The wobbe index is an attempt to measure the gas stream to assure that is will burn properly without having to adjust the burner air/fuel adjustment. 6. Therefore, gross calorific value includes both the heat liberated when we burn the fuel and the latent heat of condensation of steam. Both the Wobbe index and calorific value relate to different fuels. 5. We can use different units to measure this value. What is Calorific Value If two fuels Page 2/10 Therefore. Definitions Heating- or Calorific Value (HV or CV): The amount of heat evolved by the complete combustion of a unit Wobbe Index / Calorific Value / CARI The Cosa 9750 is a fast response Zero Emission calorimeter for the on-line monitoring of Wobbe Index (WI), Combustion Air Requirement Index (CARI) and Heating Value (HV). 2. Since the Wobbe index relates heating characteristics of blended fuel gases it can be used to obtain constant heat flows from gases of varying compositions. Compare the Difference Between Similar Terms. The heating value can be measured as energy released per unit mass, unit volume or unit mole of a substance. Get answers by asking now. 3). In the late 1920s, he first determined the relationship between the heat output of a burner, the specific gravity of the gas used, and its higher heating value. The difference between wobbe index and calorific value is that wobbe index indicates the interchangeability of fuel gases whereas calorific value indicates the total amount of heat energy generates when we burn a unit mass of fuel. Then we can give the relationship between these three parameters in an equation as follows: This means the Wobbe index equals to the division of higher heating value from the square root of the specific gravity of the fuel. Still have questions? WOBBE INDEX VS. The ratio of part one to part two is the Wobbe Index. %PDF-1.4 The Wobbe index gives the relative ability of fuel gases to generate heat energy. The Wobbe Index is actually the correct representation of the heating value of natural gas arriving, from the gas line, at the orifice where a burner is located. All rights reserved. The Wobbe Index does not relate flame temperatures, heat transfer coefficients or temperature gradients. The MKS Precisive ® 5 Gas Analyzer is an industry-first all-optical measurement system providing real-time speciation of hydrocarbon components. The Wobbe Index (based on lower heating value) that Alstom’s gas turbines are designed to handle using standard burners is 965 to 1290. Ask question It is common practice in the electric power industry top use the lower heating value (LHV) … Close to 2000 units have been deployed for the measurement of C1 – C5 alkane gases in natural gas and hydrocarbon processing industries to-date. It escapes along with hot gases produced there. Wobbe index (WI) of a gas (normally natural gas) is the indication of the heating value of the gas from the pipeline at the orifice where a burner is located, this could be a gas turbine or a boiler. The second is the square root of the specific gravity, representing the supply of gas. The Wobbe Index does not relate flame temperatures, heat transfer coefficients or temperature gradients. the amount of heat produced by combustion a unit quantity of a fuel; We differentiate between gross and net heating values: Gross (or high, upper) Heating Value. 36 is as follows:2 “The Wobbe number, or Wobbe index, of a fuel gas is found by dividing the high heating value of the gas in Btu per standard cubic foot by the square t�jo撗�4.�h&�-����x���9�����A䅯��G��w�JZW�O����p�m�:-�J��J�/ʳ���C�)�̇WA���]X�T,����b\�dXJ����s ��(��a��Q�Qh����~�u� Available here  According to natural gas quality for vehicle standards by the Department of Energy Business, Ministry of Energy, Thailand the required heating value is 37- 42 MJ/Nm3 [6]. Figure 01: We can use Wobbe index to compare the energy outputs of different fuel gases. endobj .EH��f���<��P̕���,h:I�V��ҴN���q�, Application Data: Heating Value and Wobbe Index Measurement in Natural Gas for Fast Turbine Control. This correction is also required in the calculation of density, relative density and, by im-plication, Wobbe index… WIM9900 Wobbe Index analyser offers an unmatched combination of response time, accuracy and availability over a large range of gas compositions without the concerns of flameouts or the need for support gases. I am Proud to be a Programmer Follow. For example, the wobbe index for natural gas is around 39 MJ/Nm³. The Wobbe Index and Natural Gas Interchangeability. Therefore, instead of measuring the higher heating value of a fuel directly using a calorimeter, it is possible to determine the air requirement to calculate the CARI index and then correlate it to the Wobbe index. The Wobbe Index (WI) or Wobbe number is an indicator of the interchangeability of fuel gases such as natural gas, liquefied petroleum gas (LPG), and town gas and is frequently defined in the specifications of gas supply and transport utilities. ISO 6976 (1995) Natural gas - Calculation of calorific values, density, relative density and Wobbe index from composition The heating value (or energy value or calorific value) of a substance, usually a fuel or food (see food energy), is the amount of heat released during the combustion of a specified amount of it.. The Wobbe index quality of bio-methane gas in this study revealed that it is suitable to use in gas engine vehicles. Therefore we can define it as the efficiency of fuel. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry. The corresponding range for the Wobbe index is usually between 40 MJ/m 3 and 60 MJ/m 3. The chemical symbol for Wobbe index is Iw. The Wobbe Index is defined as WI=CV [divided by] SG[0.5], where CV is the calorific value (higher heating value, HHV) of the fuel and SG is the fuel’s specific gravity. La differenza chiave tra l'indice di Wobbe e il potere calorifico è che l'indice di Wobbe indica l'intercambiabilità dei gas combusti mentre il valore calorifico indica la quantità totale di energia termica generata quando bruciamo una massa unitaria di carburante. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. Heating Value and Wobbe Index Analyzer. On the other hand, this value measures the relative ability of fuel gases to deliver energy. Figure 6 presents a comparative trend between the different Wobbe Index before and after the extraction process. However, under normal conditions, steam does not condense. Gas with different compositions but the same Wobbe Index provides the same amount of energy at the same pressure (Fig. Figure 1 Worldwide Heating Value Specifications In Europe a gas interchangeability index (the Wobbe Index) is also specified. The index is named for Italian scientist Goffredo Wobbe. The basis for the Wobbe Index is if two fuel gases have identical Wobbe numbers, they will deliver the same amount of heat. <>stream application/pdfApplication Data: Heating Value and Wobbe Index Measurement in Natural Gas for Fast Turbine ControlRosemount - Emerson The gross heating value is obtained when Heating value is in units of Btu/ft[3]. ADVANTAGES Key advantages of this method are its insensitivity to changes in ambient temperature, a very fast response with the ability to measure gases with BTU values down to zero and the measurement of the Combustion Air Requirement Index besides Wobbe Index and Heating Value. For a given country, the maximum value represents the highest maximum of all datasets, same applies for 95 percentile; similarly, the minimum value represents the lowest minimum of all datasets, same applies for 5 percentile. difference between calorific value and wobbe index? 2 0 obj For the volumetric-basis calorific value, a second real-gas correction is required to account for the deviation of the gas from volumetric ideality, and this is gener-ally not negligible. The gross or high heating value is the amount of heat produced by the complete combustion of a unit quantity of fuel. This is the parameter that gives a relative measure of the mix/heating value. The Wobbe index is a measure for the heating value of a gas composition and is the most-frequently used indicator for the quality of natural gas and the interchangeability of different gas types [2,60,61]. The wobbe index is an attempt to measure the gas stream to assure that is will burn properly without having to adjust the burner air/fuel adjustment. The Wobbe Index is actually the correct representation of the heating value of natural gas arriving, from the gas line, at the orifice where a burner is located. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. The Wobbe index and specific density are measured, and the heating value and combustion value are calculated from these measurements. If the two different gases have an identical Wobbe Index, they will produce an equal amount of heat and combustion products and will require the same amount of combustion air. heating value not affect the gas richness. Heating Value Wobbe index= To clarify the concept consider following fuel gas cases: The lower heating value by volume of these two gases is the same, i.e. From AGA Bulletin 36: “The Wobbe number, or Wobbe index, of a fuel gas is found by dividing the high heating value of the gas in Btu per standard cubic foot by the square root of its specific gravity with respect to air. PDF From natural gas to hydrogen via the Wobbe index. %���� On the other hand, this value measures the relative ability of fuel gases to deliver energy. For instance, the ratio between methane (CH 4) and non-methane hydrocarbons (C2+) is strongly depending on the source of the fuel gas. Background As a continuation of mandate M400 and supported by the conclusions of the 29th Madrid forum, CEN continues working on finding an EU agreement for a Wobbe Index band, including elaborating on the possibility of regional bands. The Wobbe Index (WI) is defined by the following equation: Wobbe Index=HHV/(SG) ½, where the HHV is the higher heating value of the fuel, also known as the gross heating value, and SG is the specific gravity of the fuel. In the late 1920s, he first determined the relationship between the heat output of a burner, the specific gravity of the gas used, and its higher heating value. “Summary.” Wobbe Index – Neutrium. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. On the other hand, this value measures the relative ability of fuel gases to deliver energy. The fuel gases that we talk about here are natural gas, liquefied petroleum gas, producer gas, etc. The higher heating value is used to calculate Wobbe numbers—a/k/a Wobbe Index (WI). When considering the units of measurement of each value, we can measure the Wobbe index using MJ/Nm3 while we measure the calorific value using calories, kilocalorie, British thermal unit (BTU) and centigrade heat unit (CHU). 1 0 obj Wobbe number - Sizes The electrical voltage at the output of the thermopile is a function of the Wobbe Index value. Wobbe Index is used to compare the combustion energy output with different composition of fuel gases. The calorific value, or heating value, of a gas is proportional to its specific gravity. For the use of gas fuels having a significant vari-ation in composition or heating value, a per- Ex: calories, kilocalorie, British thermal unit (BTU) and centigrade heat unit (CHU). An explanation of the Wobbe Index from AGA Bul-letin No. The fuel gases include natural gas, liquefied petroleum gas (LPG) and town gas. The Wobbe Index and/or Heating Value are critical parameters used to optimize blending and com- bustion processes. When we consider the fuels containing hydrogen atoms, there are two different calorific values; The gross calorific value includes two values; when we completely burn a fuel containing hydrogen, it converts into steam, then if we cool it down to room temperature, the steam condenses into water. Two gases with the same Wobbe Index will deliver the sameamount of heat into a combustion process per unit of time regardless of the composition.Wobbe index = Heating Value Specific GravityTo clarify the concept consider following fuel gas cases: CH4 MIX 1 MIX 2 H2 40% 58% N2 60% Heating Value - Specific - 42% Gravity 20,82 MJ/Nm3 20,82 MJ/Nm3 Wobbe Index 0,73 0,26 24,39 MJ/Nm3 40,55 … The below infographic presents the difference between wobbe index and calorific value in tabular form for quick reference. The COSA 9750 is based on the Residual Oxygen Method (ROM), thus avoiding the use of a flame. The heat value is. endstream Heating value is the amount of heat produced by a complete combustion of fuel and it is measured as a unit of energy per unit mass or volume of substance (e.g., kcal/kg, kJ/kg, J/mol and Btu/m³). Application Data Heating Value and Wobbe Index. For example, this value indicates whether a turbine will run on an alternative fuel source without any tuning or physical alteration. Wobbe index is an indicator of the interchangeability of fuel gases. What is Wobbe Index 2. Wobbe index is an indicator of the interchangeability of fuel gases whereas Calorific value is the total amount of heat energy that a unit mass of fuel can produce when we burn it completely. difference between calorific value and wobbe index? General Information Wobbe Index And Calorimeters Hobre ... Wobbe index is an indicator of the interchangeability of fuel gases. 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