This study presents a superstructure based mathematical model for the optimisation of the CO₂ capture process from flue gas by use of a fixed site carrier membrane. The goal is to determine the optimum process flow sheet that gives the minimum total cost whilst achieving 90 % recovery and 95 % purity of CO₂. The model is applied to a case study of a coal-fired power plant to assess the merits of the optimisation and the feasibility of implementing the membrane at a large scale. The membrane properties used in the simulation are obtained from the literature. This work involves the use of an accurate expression for CO₂ permeance of CO₂ in a poly-amine fixed site carrier membrane in relation to CO₂ partial pressure. This allows pressure to be a variable in the optimisation problem. The use of water vapour as sweep is also explored and compared to the vacuum-driven only process. The application of the model results in a decrease in membrane area requirement of 46 % and a decrease of 13.6 % in the cost of CO₂ avoided compared to a pre-determined two stage cascade process operating at uniform pressure. The results show that the use of water vapour as sweep in conjunction with vacuum pumps on the other membrane stages is more economical compared to the use of vacuum pumps only.

这项研究提出了一个基于上层结构的数学模型，用于通过使用固定位点载体膜优化烟气中CO ₂捕集过程的方法。目的是确定最佳工艺流程，使总成本最小，同时实现90％的回收率和95％的CO ₂纯度。该模型被应用于一个燃煤电厂的案例研究，以评估优化的优点以及大规模实施该膜的可行性。模拟中使用的膜特性可从文献中获得。这项工作涉及使用精确表达式的对CO ₂的CO渗透性₂在聚胺固定站点载体膜相对于CO ₂分压。这使压力成为优化问题中的变量。还探索了使用水蒸气作为清扫物，并将其与仅由真空驱动的过程进行了比较。与在均匀压力下运行的预定两级串联工艺相比，该模型的应用导致膜面积需求减少了46％，避免的CO ₂成本减少了13.6％。结果表明，与仅使用真空泵相比，在其他膜级上结合使用水蒸气作为扫气与真空泵更经济。