Integrated Process of Monoethanolamine-Based CO2 Absorption and CO2 Mineralization with SFGD Slag: Process Simulation and Life-Cycle Assessment of CO2 Emission,ACS Sustainable Chemistry & Engineering

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Integrated Process of Monoethanolamine-Based CO2 Absorption and CO2 Mineralization with SFGD Slag: Process Simulation and Life-Cycle Assessment of CO2 Emission
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-06-09 , DOI: 10.1021/acssuschemeng.1c02278
Zhi Yan ₁ , Yan Wang ₁ , Hairong Yue _{1,

2} , Changjun Liu ₁ , Shan Zhong ₁ , Kui Ma ₁ , Wenjie Liao ₂ , Siyang Tang ₁ , Bin Liang _{1,

2}

Affiliation

Integrated CO₂ absorption and mineralization (IAM) is a promising approach to fix CO₂ in a far less energy-intensive way. The semidry flue gas desulfurization (SFGD) slag containing a considerable amount of Ca(OH)₂ is potential for mineralizing CO₂. In this work, an IAM process combining monoethanolamine (MEA)-based CO₂ absorption and mineralization with SFGD slag is proposed and investigated to provide a systematical evaluation of the net CO₂ fixation. A desorption efficiency of 68% and an entrainment efficiency of 32 wt % were experimentally determined. An entire IAM process model with a design specification of 8350 N m³/h flue gas feeding and a CO₂ fixation efficiency of 90% is simulated using Aspen Plus software. Net CO₂ fixation efficiency is analyzed through life-cycle assessment (LCA). A direct relationship between parameters and LCA of CO₂ emission is built based on parameter sensitivity analysis. The IAM process, achieving the goal of gaseous waste treatment with solid waste, shows significant environmental benefits in reducing CO₂ emission. MEA loss is the major contributor to CO₂ emission, and energy consumption follows. A net CO₂ fixation efficiency of 87.6% can be obtained with the optimized parameters. Reducing MEA loss would be effective to increase net CO₂ fixation efficiency of the whole process. This work provides a quantitative understanding of CO₂ fixation of the IAM process for industrial application and a guideline for further process optimization.

中文翻译：

单乙醇胺基CO ₂吸收与SFGD矿渣CO ₂矿化一体化工艺：CO ₂排放过程模拟与全生命周期评价

综合 CO ₂吸收和矿化 (IAM) 是一种很有前景的方法，可以以低得多的能源密集型方式固定 CO ₂。含有大量 Ca(OH) ₂的半干烟气脱硫 (SFGD) 炉渣具有矿化 CO _{2 的}潜力。在这项工作中，提出并研究了一种将基于单乙醇胺 (MEA) 的 CO ₂吸收和矿化与 SFGD 炉渣相结合的 IAM 工艺，以提供对净 CO ₂固定的系统评估。实验确定解吸效率为 68%，夹带效率为 32wt%。设计规格为 8350 N m ³ /h 烟气进料和 CO的完整 IAM 工艺模型₂ 90% 的固定效率是使用 Aspen Plus 软件模拟的。净 CO ₂固定效率通过生命周期评估 (LCA) 进行分析。基于参数敏感性分析建立了参数与CO ₂排放的LCA 之间的直接关系。IAM 工艺实现了用固体废物处理气体废物的目标，在减少 CO ₂排放方面显示出显着的环境效益。MEA损失是CO ₂排放的主要贡献者，其次是能源消耗。使用优化的参数可以获得87.6%的净CO ₂固定效率。减少 MEA 损失将有效增加净 CO ₂整个过程的固定效率。这项工作提供了对工业应用中 IAM 过程的 CO ₂固定的定量理解，并为进一步的过程优化提供了指导。

更新日期：2021-06-21

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