针对海上平台天然气脱硫脱碳及废气处理问题,提出一种“膜分离+酸气回注”工艺体系。分析了膜分离技术与酸气回注技术在石油化工领域应用情况,提出采用膜分离技术对海上平台采出气进行脱硫脱碳处理,再采用酸气回注技术将脱除的酸气回注至地层封存。结合某海上平台生产情况,设计了“二级膜分离+四级压缩”酸气回注工艺,从工艺设备成橇体积、系统生产能耗、工艺副产物处理等方面与LOCAT工艺做对比。对比结果表明:“二级膜分离+四级压缩”酸气回注工艺设备成橇尺寸更小(11 m×8 m×7 m),系统生产能耗更低(269.9 kW),兼具无副产物生成、脱硫脱碳等优点。结论认为:膜材料多样性、分离与压缩级数可调节性,使“膜分离+酸气回注”工艺体系对不同油气田开发方案均有良好适用性,在海上平台应用具有良好经济与环保前景,国内相关领域研究有待进一步推进。

 In order to address the issues of gas desulfurization and CO2 removal control and waste gas treatment in offshore platforms, a process system of “membrane separation + acid gas reinjection” is proposed. Firstly, the application of membrane separation technology and acid gas reinjection technology in petrochemical industry is analyzed. The paper proposed that the membrane separation technology be used to desulphurize and remove CO2 from the gas produced on offshore platform, and then the acid gas reinjection technology be used to reinject the acid tail gas back into the formation for storage. Secondly, the “two-stage membrane separation+four-stage compression” process is designed and compared with LO-CAT process from the aspects of process equipment skid footprint, process system production energy consumption, process by-product treatment and so on. The results show that “two-stage membrane separation + fourstage compression” process equipment skid-size is smaller (11 m×8 m×7 m), and the system production energy consumption is lower (269.9 kW), with simultaneous desulfurization and CO2 removal and emits no by-prduct. It is concluded that with the diversified membrane material and the adjustable separation and compression stages, the “membrane separation + acid gas reinjection” technology system has good applicability to various oil and gas field development plans, and enjoys promising economic and environmental protection prospects on offshore platform application. It is recommended that this related research needs to be further promoted in China.