In order to address the current global warming, this work proposes CO₂ capture from flue gas and CO₂ hydrogenation to produce methane, methanol, and CO₂ to produce ammonium bicarbonate. Aspen Plus process simulation model is developed for the three processes. Based on the thermodynamic model, sensitivity analysis of main operating parameters is conducted on the energy, economic, environment, and exergy (4E) indicator. Non-dominated sorting genetic algorithm is used to achieve multi-objective optimization. The optimum operating parameters of the three processes are obtained under the 4E indicators. It is concluded that the CO₂ to ammonium bicarbonate is the optimal process route for CO₂ conversion. The corresponding total annual cost is 4.071 M$/year, the CO₂ equivalent emission per unit product is −0.0667 tCO₂/t pro, the annual total utility consumption is 7062.75 kW/year, and the exergy efficiency of system is 53.42 %. This work shows significance for achieving resource utilization with capture CO₂.

中文翻译：

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低浓度烟气 CO2 捕集和多产品转化过程的 4E 评价和多目标优化


为了解决当前的全球变暖问题，本研究提出了从烟气中捕获 CO₂ 和 CO₂ 加氢以产生甲烷、甲醇和 CO₂ 以生产碳酸氢铵。Aspen Plus 工艺模拟模型是为这三个工艺开发的。基于热力学模型，对能源、经济、环境和用能 （4E） 指标进行主要运行参数的敏感性分析。采用非支配排序遗传算法实现多目标优化。在 4E 指标下获得三个过程的最佳运行参数。结论是，CO₂ 制碳酸氢铵是 CO₂ 转化的最佳工艺路线。相应的年总成本为 4.071 M$/年，单位产品的_CO2 当量排放量为 -0.0667 tCO₂/t pro，年总公用事业消耗量为 7062.75 kW/年，系统用能效率为 53.42 %。这项工作显示了通过捕获 CO₂ 实现资源利用的重要性。