Chemical absorption is currently the most promising large-scale CO₂ capture technology due to its high capture efficiency, mature process, and good compatibility. While this process uses solvent to absorb the CO₂ from flue gas in absorption column, part of the solvents and its degradation products are discharged with the flue gas, causing new environmental pollution. This paper introduces the pollutants emission situation of chemical absorption CO₂ capture process. The characteristics of three typical emission forms, including physical entrainment, gas and aerosol, are systematically depicted. Then, the formation mechanism and influencing factors of pollutant emissions are discussed. And the effect of flue gas nuclei and absorber conditions on aerosol emissions are also described. Finally, the paper summarizes the effects, advantages, and disadvantages of different emission control methods. This review can provide guidance for industrial applications of chemical absorption systems.

化学吸收由于其高捕获效率，成熟的工艺和良好的兼容性，目前是最有前途的大规模CO ₂捕获技术。尽管该方法使用溶剂从吸收塔中的烟道气中吸收CO ₂，但部分溶剂及其降解产物随烟道气一起排出，造成了新的环境污染。介绍了化学吸收CO ₂的污染物排放状况捕获过程。系统地描绘了三种典型的排放形式的特征，包括物理夹带，气体和气溶胶。然后，讨论了污染物排放的形成机理和影响因素。并且还描述了烟气核和吸收器条件对气溶胶排放的影响。最后，本文总结了不同排放控制方法的效果，优缺点。该综述可以为化学吸收系统的工业应用提供指导。