Exergy Analysis and Retrofitting of Natural Gas-based Acetylene process

Abstract

Abstract: This article presents an acetylene production process by partial oxidation/combustion of natural gas. The thermodynamic performance and exergy analysis in the process are investigated using the flow-sheeting program Aspen Plus.The results indicate that the most important destruction of exergy is found to occur in the reactor and water quenching scrubber,amounting to 8.23% and 10.39%,respectively,of the entire system.Based on the results of thermodynamic and exergy analysis,the acetylene reactor has been retrofitted.The improvement ratios of molar O₂ to CH₄ and molar CO to CH₄ are 0.65 and 0.20,respectively.An improvement of the acetylene production system is proposed.Adopting the improvement operation conditions and using oil to realize the reaction heat recovery,the feedstock of natural gas is reduced by 9.88%and the exergy loss in the retrofitting process is decreased by 19.71%compared to the original process.

Key words: acetylene, exergy analysis, natural gas, partial oxidation, hydrogen

摘要： This article presents an acetylene production process by partial oxidation/combustion of natural gas. The thermodynamic performance and exergy analysis in the process are investigated using the flow-sheeting program Aspen Plus.The results indicate that the most important destruction of exergy is found to occur in the reactor and water quenching scrubber,amounting to 8.23% and 10.39%,respectively,of the entire system.Based on the results of thermodynamic and exergy analysis,the acetylene reactor has been retrofitted.The improvement ratios of molar O₂ to CH₄ and molar CO to CH₄ are 0.65 and 0.20,respectively.An improvement of the acetylene production system is proposed.Adopting the improvement operation conditions and using oil to realize the reaction heat recovery,the feedstock of natural gas is reduced by 9.88%and the exergy loss in the retrofitting process is decreased by 19.71%compared to the original process.

关键词: acetylene, exergy analysis, natural gas, partial oxidation, hydrogen

WANG Zhifang, ZHENG Danxing. Exergy Analysis and Retrofitting of Natural Gas-based Acetylene process[J]. , 2008, 16(5): 812-818.

王志方, 郑丹星. Exergy Analysis and Retrofitting of Natural Gas-based Acetylene process[J]. , 2008, 16(5): 812-818.

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