关键词: 高含硫天然气, 净化装置, , 醇胺溶液

Abstract: To address the problem of high energy consumption of highly sour natural gas purification plant，exergy analysis was used to study the energy process of highly sour gas purification plant. The exergy calculation methods of natural gas purification process were established，and exergy calculation method of ionic solution system was corrected to calculate exergy of methylamine solution. On the basis of the whole process model built with simulation software of gas purification process ProMax，energy consumption process of the whole process of highly-sour natural gas purification plant was analyzed by exergy analysis. The exergy efficiency of the whole process of purification plant was 54.2%，with the highest exergy efficiency values of sulfur recovery unit and tail gas treatment unit 66.8% and 66.1% respectively. And the exergy loss of acid gas sweetening unit was the highest. The raw gas of purification plant was high H2S concentration and needed a greater amount of circulating solvent to remove acid gas to reach commodity gas standards. So the energy consumption of absorbing solvent regeneration process was greatly increased. Research conclusions could be used to guide energy evaluation and energy saving retrofit for highly sour natural gas purification plant.

Key words: highly sour natural gas, purification plant, exergy, methylamine solution