Abstract
There is an increasing awareness that process gases, such as associated gases in oil extraction and byproduct gases in liquidizing of natural gas, can be utilized for energy production. Efficient energy production through the use of a gas turbine is profitable both from economical and environmental point of view compared to simply getting rid of the process gas in flares. Gases with an elevated amount of heavier hydrocarbons generally speaking burns faster and more intense compared to standard natural gas. In gas turbines with so called premixed, low emitting combustor systems this might induce changes in flame stability and the combustion stability connected with this. This might in turn affect the emissions from the gas turbine, the operation life and ability to operate. This work aimed at proving the potential of running Siemens standard SGT-600 and SGT-700 engines on gas with elevated amount of heavy hydrocarbons. Pentane (C{sub 5}H{sub 12}) was used as a model substance for heavy hydrocarbons and a facility for feeding and mixing pentane with natural gas was designed and built at Siemens delivery test bed in Finspaang. The two engines were demonstrated to be able to operate on the mixed fuel at various loads. The results
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Citation Formats
Naesvall, Henrik, and Larfeldt, Jenny.
Power Generation Utilizing Process Gases to Avoid Flaring; Elkraftproduktion ur processgas som idag facklas.
Sweden: N. p.,
2011.
Web.
Naesvall, Henrik, & Larfeldt, Jenny.
Power Generation Utilizing Process Gases to Avoid Flaring; Elkraftproduktion ur processgas som idag facklas.
Sweden.
Naesvall, Henrik, and Larfeldt, Jenny.
2011.
"Power Generation Utilizing Process Gases to Avoid Flaring; Elkraftproduktion ur processgas som idag facklas."
Sweden.
@misc{etde_1004309,
title = {Power Generation Utilizing Process Gases to Avoid Flaring; Elkraftproduktion ur processgas som idag facklas}
author = {Naesvall, Henrik, and Larfeldt, Jenny}
abstractNote = {There is an increasing awareness that process gases, such as associated gases in oil extraction and byproduct gases in liquidizing of natural gas, can be utilized for energy production. Efficient energy production through the use of a gas turbine is profitable both from economical and environmental point of view compared to simply getting rid of the process gas in flares. Gases with an elevated amount of heavier hydrocarbons generally speaking burns faster and more intense compared to standard natural gas. In gas turbines with so called premixed, low emitting combustor systems this might induce changes in flame stability and the combustion stability connected with this. This might in turn affect the emissions from the gas turbine, the operation life and ability to operate. This work aimed at proving the potential of running Siemens standard SGT-600 and SGT-700 engines on gas with elevated amount of heavy hydrocarbons. Pentane (C{sub 5}H{sub 12}) was used as a model substance for heavy hydrocarbons and a facility for feeding and mixing pentane with natural gas was designed and built at Siemens delivery test bed in Finspaang. The two engines were demonstrated to be able to operate on the mixed fuel at various loads. The results show that both engines are able to stable operation on fuels with up to 10% by volume pentane content. Stable in the sense that no change in combustion dynamics was noted and the control system worked as normal. There were no impact on the temperature distribution through the turbine that could be seen and a boroscope inspection after the test did not reveal anything unusual. A slight increase in emissions of nitrogen oxides (NO{sub x}) was detected explained by a slightly more intense flame which also explains the simultaneous lowering of carbon monoxide (CO) emissions. Unexpected difficulties were faced by the external laboratories when the sampled gas samples should be analysed. If the difficulties in analysing the samples could have been foreseen, more effort would have been put into developing and evaluating the different methods before the test. The error margin in determining the pentane content was thus quite high, about 10% of the volumetric concentration. To conclude the work, it is demonstrated that SGT-600 and SGT-700 standard engines can operate on natural gas containing up to 10% by volume pentane with slight increase in NOx emissions. The limit of pentane in these tests was given by the gas feeding temperature and the dew point. At gas temperatures lower than the dew point, droplets of pentane form which can cause uncontrolled combustion resulting in burner hardware damages. Heating of the gas fuel allows for test on operation on gas with even higher contents of heavy hydrocarbons}
place = {Sweden}
year = {2011}
month = {Jan}
}
title = {Power Generation Utilizing Process Gases to Avoid Flaring; Elkraftproduktion ur processgas som idag facklas}
author = {Naesvall, Henrik, and Larfeldt, Jenny}
abstractNote = {There is an increasing awareness that process gases, such as associated gases in oil extraction and byproduct gases in liquidizing of natural gas, can be utilized for energy production. Efficient energy production through the use of a gas turbine is profitable both from economical and environmental point of view compared to simply getting rid of the process gas in flares. Gases with an elevated amount of heavier hydrocarbons generally speaking burns faster and more intense compared to standard natural gas. In gas turbines with so called premixed, low emitting combustor systems this might induce changes in flame stability and the combustion stability connected with this. This might in turn affect the emissions from the gas turbine, the operation life and ability to operate. This work aimed at proving the potential of running Siemens standard SGT-600 and SGT-700 engines on gas with elevated amount of heavy hydrocarbons. Pentane (C{sub 5}H{sub 12}) was used as a model substance for heavy hydrocarbons and a facility for feeding and mixing pentane with natural gas was designed and built at Siemens delivery test bed in Finspaang. The two engines were demonstrated to be able to operate on the mixed fuel at various loads. The results show that both engines are able to stable operation on fuels with up to 10% by volume pentane content. Stable in the sense that no change in combustion dynamics was noted and the control system worked as normal. There were no impact on the temperature distribution through the turbine that could be seen and a boroscope inspection after the test did not reveal anything unusual. A slight increase in emissions of nitrogen oxides (NO{sub x}) was detected explained by a slightly more intense flame which also explains the simultaneous lowering of carbon monoxide (CO) emissions. Unexpected difficulties were faced by the external laboratories when the sampled gas samples should be analysed. If the difficulties in analysing the samples could have been foreseen, more effort would have been put into developing and evaluating the different methods before the test. The error margin in determining the pentane content was thus quite high, about 10% of the volumetric concentration. To conclude the work, it is demonstrated that SGT-600 and SGT-700 standard engines can operate on natural gas containing up to 10% by volume pentane with slight increase in NOx emissions. The limit of pentane in these tests was given by the gas feeding temperature and the dew point. At gas temperatures lower than the dew point, droplets of pentane form which can cause uncontrolled combustion resulting in burner hardware damages. Heating of the gas fuel allows for test on operation on gas with even higher contents of heavy hydrocarbons}
place = {Sweden}
year = {2011}
month = {Jan}
}