Abstract Carbon capture and storage (CCS) is a promising method for limiting the effects of global warming. A multistage membrane process is needed to capture and recover high-purity CO2 from off-gas with low CO2 concentrations in thermal power plants. In this study, a simple design method based on the “no-mixing-loss” concept was suggested. The performance of the process could be improved by avoiding mixing loss and the optimization process was simplified using a reduced number of optimization parameters. The feed and permeate pressure, and the design criteria of CO2 concentration at the retentate side in each section were considered as decision variables for optimizing the process with a target purity of 95% and a target recovery of 90%. Three-, five-, and seven-stage processes were designed and evaluated in terms of energy consumption and capture cost. In addition, a well-designed inner cooling system in the pressure units enhanced compressor efficiency and contributed to the reduction in energy consumption and costs.

中文翻译：

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火电厂尾气多级膜碳捕集工艺无混合损失设计

摘要 碳捕获与封存 (CCS) 是限制全球变暖影响的一种很有前景的方法。需要采用多级膜工艺从火力发电厂低 CO2 浓度的废气中捕获和回收高纯度 CO2。在这项研究中，提出了一种基于“无混合损失”概念的简单设计方法。通过避免混合损失可以提高过程的性能，并且使用减少的优化参数数量来简化优化过程。进料压力和渗透压力，以及各段截留侧 CO2 浓度的设计标准被视为优化过程的决策变量，目标纯度为 95%，目标回收率为 90%。三、五、并根据能源消耗和捕获成本设计和评估了七阶段过程。此外，压力机组中精心设计的内部冷却系统提高了压缩机效率，有助于降低能耗和成本。