对于浮式液化天然气生产储卸装置（FLNG）天然气脱CO₂项目，当原料气处理量与CO₂含量均处于较高水平时，采用醇胺工艺存在能耗高、塔器尺寸大、塔器性能受风浪摇晃影响大等问题。针对该问题，提出先采用膜分离工艺对原料气粗脱CO₂，再采用醇胺工艺对原料气精脱CO₂；依托某深水气田开发项目生产数据，采用HYSYS软件建立“膜分离+醇胺法”耦合工艺仿真模型，从设备尺寸、系统能耗、烃类损失等方面与醇胺工艺进行对比分析。结果表明：“膜分离+醇胺法”耦合工艺的塔器（吸收塔与再生塔）尺寸小于醇胺工艺；膜分离工艺将原料气中CO₂物质的量分数从28.8%降至15.0%~20.0%后，再用膜分离工艺将CO₂质量浓度降至98 mg/m³，系统总能耗可降至42%~61%，但烃类损失率从1.2%增至5.0%~8.0%，且新增膜分离设备的膜面积为890~1 481 m³。这说明“膜分离+醇胺法”耦合技术在FLNG天然气脱CO₂领域具有潜力，工艺设计时应综合考虑系统能耗、设备投资、产品收益与废气处理。

For the natural gas CO₂ removal project applied in the floating liquefied natural gas production storage and unloading system（FLNG），when the feed gas processing capacity and CO₂ content are both at a high level，the alkanolamine process has problems such as high energy consumption，large tower size，and tower performance being greatly affected by wind and wave shaking.In response to this issue，it was proposed to firstly use membrane separation technology for crude CO₂ removal from raw gas，and then use alkanolamine process for fine CO₂ removal from raw gas.Based on the production data of a certain deep⁃water gas field development project，a coupled process simulation model of "membrane separation+alkanolamine method" was established using HYSYS software.The model was compared and analyzed with the alkanolamine process in terms of equipment size，system energy consumption，hydrocarbons loss，etc.The results showed that the size of the tower（absorption tower and regeneration tower） in the "membrane separation+alkanolamine method" coupling process was smaller than that in the alkanolamine process.After the membrane separation process reducing the molar fraction of CO₂ in the feed gas from 28.8% to 15.0%~20.0%，the CO₂ concentration was then reduced to 98 mg/m³ using the membrane separation process，the total energy consumption of the system was decreased to 42%~61%，but the hydrocarbons loss rate was increased from 1.2% to 5.0%~8.0%，and the membrane area of the membrane separation equipment was 890~1 481 m³.The conclusion was that the coupling technology of "membrane separation+alkanolamine method" had potential in the field of FLNG natural gas CO₂ removal，and the process design should comprehensively consider system energy consumption，equipment investment，product revenue，and waste gas treatment.