Abstract Energy management is always facing a trade-off among the constrains of efficiency, energy consumption and CO2 capture rate. For example, the Rectisol wash is a promising and efficient purification process for acid gas removal. However, this process has the problems of high cold energy consumption and low CO2 capture rate. To solve the problems, this paper proposed an improved integrated Rectisol (Int-Rectisol) process with CO2 partial liquefaction. This paper demonstrated how to comprehensively reduce the energy consumption by liquefying part of the CO2 from the treated syngas before absorption. The decreased CO2 concentration in the syngas consequently reduced the methanol solvent consumption and regeneration in the process. Meanwhile, less solvent circulation and regeneration further reduced the energy consumption of the overall process. Process modeling and simulation was conducted in Aspen Plus. The techno-economic performance was then evaluated and compared with the conventional process. The results showed that the solvent circulation in the Int-Rectisol process reduced by 46.5% and the energy consumption decreased from 389.1 MJ to 204.3 MJ for capturing 1 kg of CO2. Meanwhile, the CO2 capture rate also increased from 46.7% to 85%. The exergy analysis showed that the exergy destruction in the Int-Rectisol was 20.95 MW less than the Rectisol process. As for the economic benefit, the Int-Rectisol process reduced the total capital investment and the total product cost by 12.4% and 8.7%, respectively.

中文翻译：

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综合能源消耗和 CO2 捕集管理：改进的酸性气体去除工艺与 CO2 液化相结合

摘要 能源管理总是面临效率、能源消耗和二氧化碳捕集率之间的权衡。例如，Rectisol 洗涤是一种很有前景且有效的酸性气体去除净化工艺。但该工艺存在冷能消耗高、CO2捕集率低的问题。针对上述问题，本文提出了一种改进的CO2部分液化一体化Rectisol（Int-Rectisol）工艺。本文展示了如何通过在吸收前将处理后的合成气中的部分 CO2 液化来综合降低能耗。合成气中 CO2 浓度的降低因此减少了该过程中的甲醇溶剂消耗和再生。同时，更少的溶剂循环和再生进一步降低了整个过程的能耗。在 Aspen Plus 中进行过程建模和模拟。然后评估技术经济性能并与传统工艺进行比较。结果表明，Int-Rectisol 工艺中的溶剂循环减少了 46.5%，捕获 1 kg CO2 的能耗从 389.1 MJ 降低到 204.3 MJ。同时，CO2 捕集率也从 46.7% 提高到 85%。火用分析表明，Int-Rectisol 工艺的火用破坏比 Rectisol 工艺小 20.95 MW。就经济效益而言，Int-Rectisol 工艺使总投资和总产品成本分别降低了 12.4% 和 8.7%。结果表明，Int-Rectisol 工艺中的溶剂循环减少了 46.5%，捕获 1 kg CO2 的能耗从 389.1 MJ 降低到 204.3 MJ。同时，CO2 捕集率也从 46.7% 提高到 85%。火用分析表明，Int-Rectisol 工艺的火用破坏比 Rectisol 工艺小 20.95 MW。就经济效益而言，Int-Rectisol 工艺使总投资和总产品成本分别降低了 12.4% 和 8.7%。结果表明，Int-Rectisol 工艺中的溶剂循环减少了 46.5%，捕获 1 kg CO2 的能耗从 389.1 MJ 降低到 204.3 MJ。同时，CO2 捕集率也从 46.7% 提高到 85%。火用分析表明，Int-Rectisol 工艺的火用破坏比 Rectisol 工艺小 20.95 MW。在经济效益方面，Int-Rectisol 工艺使总投资和总产品成本分别降低了 12.4% 和 8.7%。比 Rectisol 工艺低 95 MW。就经济效益而言，Int-Rectisol 工艺使总投资和总产品成本分别降低了 12.4% 和 8.7%。比 Rectisol 工艺低 95 MW。就经济效益而言，Int-Rectisol 工艺使总投资和总产品成本分别降低了 12.4% 和 8.7%。