Research progress on removal of HCl from coal-fired flue gas by alkaline absorbent

doi:10.16085/j.issn.1000-6613.2021-0236

Abstract

Abstract:

Chlorine is a trace element in coal, which is released in the form of HCl gas in the combustion process. HCl has adverse effects on limestone-gypsum wet desulfurization facilities in coal-fired power units. The technology of HCl removal from coal-fired flue gas by alkaline absorbent was put forward based on chloride ion material balance in wet desulphurization absorber slurry. The technology of HCl removal was reviewed from the aspects of the types of alkaline absorbent, the effect of reaction conditions on HCl removal, and the mechanism of HCl removal. The research direction of removing low concentration HCl from coal-fired flue gas with alkaline absorbent was pointed out.

Key words: coal-fired flue gas, hydrochloride (HCl), absorbent, reaction condition, mechanism, competing reaction

摘要：

氯是煤中的微量元素，在燃烧过程中以HCl气体的形式释放出来，对燃煤发电机组石灰石-石膏湿法脱硫设施造成不利影响。基于湿法脱硫吸收塔浆液中氯离子的物料平衡，本文提出了碱性吸收剂脱除燃煤烟气中HCl的技术思路，从碱性吸收剂种类、反应条件对脱除HCl的影响、HCl脱除机理方面对烟气脱氯技术进行了综述，指出了碱性吸收剂脱除燃煤烟气低浓度HCl的研究方向。

关键词: 燃煤烟气, 氯化氢, 吸收剂, 反应条件, 机理, 竞争反应

CLC Number:

TK09

LI Bing, ZHANG Qilong, WANG Meng, LI Jichen, XI Wen, ZHOU Can. Research progress on removal of HCl from coal-fired flue gas by alkaline absorbent[J]. Chemical Industry and Engineering Progress, 2021, 40(S1): 404-410.

李兵, 张其龙, 王猛, 李济琛, 席雯, 周灿. 碱性吸收剂脱除燃煤烟气中HCl的研究进展[J]. 化工进展, 2021, 40(S1): 404-410.

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