摘要
目前,高炉煤气碳捕集是我国钢铁行业低碳减排的重点。为了探究高炉煤气中硫化氢(H2S)、羰基硫(COS)等微量硫化物对混合胺吸收剂吸收二氧化碳(CO_(2))性能的影响和在化学吸收法脱碳过程中的反应特性,采用了甲基二乙醇胺(MDEA)为主剂,分别添加哌嗪(PZ)、氨基乙基哌嗪(AEP)、2-(甲氨基)乙醇(MMEA)和2-(乙氨基)乙醇(EMEA)形成了四种混合胺吸收剂,并以乙醇胺溶液(30%MEA,质量分数)和40%MDEA溶液为对照组,测试了含硫高炉煤气氛围下混合胺吸收剂对H2S和COS的脱除率,对CO_(2)的吸收速率、再生速率和循环容量等指标。结果表明,MDEA+PZ和MDEA+AEP吸收体系对CO_(2)的吸收速率、再生速率和循环容量均较MDEA+MMEA和MDEA+EMEA体系更优,哌嗪及其衍生物对叔胺的活化效果较仲胺更好,其中20%MDEA+20%PZ吸收剂配方的CO_(2)循环容量达187mol·L^(-1),较30%MEA提高86.2%,对H2S的脱除率高于90%,具备较高的CO_(2)吸收再生效果和良好的脱硫能力,是适用于高炉煤气脱硫脱碳的优良配方。研究还发现,微量H_(2)S和COS对CO_(2)的吸收再生效果影响较小,不会显著影响CO_(2)吸收速率和循环容量。研究结论为化学吸收法碳捕集在实际工程中应用于高炉煤气脱碳提供了理论参考。
At present,carbon capture from blast furnace gas is a key focus for low⁃carbon emission reduction in China’s steel industry.To explore the influence of trace sulfides such as hydrogen sulfide(H2S)and carbonyl sul⁃fide(COS)in blast furnace gas on the performance of mixed amine absorbents in absorbing carbon dioxide(CO_(2))and their reaction characteristics during the chemical absorption decarbonization process,four mixed amine absorb⁃ents were formed by using methyl diethanolamine(MDEA)as the main agent and adding piperazine(PZ),amin⁃oethylpiperazine(AEP),2⁃(methylamino)ethanol(MMEA)and 2⁃(ethylamino)ethanol(EMEA),respectively.Additionally,ethanolamine solution(30%MEA,mass fraction)and 40%MDEA solution were used as control groups.The removal rates of H_(2)S and COS,the absorption rate,regeneration rate and cycle capacity of CO_(2)in the mixed amine absorbents under the atmosphere of sulfur⁃containing blast furnace gas were tested.The re⁃sults showed that the absorption rate,regeneration rate and cycle capacity of CO_(2)in the MDEA+PZ and MDEA+AEP systems were higher than those in the MDEA+MMEA and MDEA+EMEA systems.Piperazine and its deriv⁃atives had a better activation effect on tertiary amines than secondary amines.Among them,the CO_(2)cycle capacity of the 20%MDEA+20%PZ absorbent formulation reached 1.87 mol·L^(-1),which was 86.2%higher than that of 30%MEA.The removal rate of H_(2)S was higher than 90%,and it exhibited high CO_(2)absorption and regeneration effects and good desulfurization capacity,making it an excellent formula for desulfurization and decarbonization of blast furnace gas.The study also found that trace H_(2)S and COS had a small impact on the CO_(2)absorption and re⁃generation performances and did not significantly affect the CO_(2)absorption rate and cycle capacity.The research provides a theoretical reference for the application of chemical absorption carbon capture in the actual engineering of blast furnace gas decarbonization.
作者
牟曼
夏芝香
许晓明
夏阳
谢颖
胡昔鸣
刘子豪
向浩
方梦祥
MOU Man;XIA Zhixiang;XU Xiaoming;XIA Yang;XIE Ying;HU Ximing;LIU Zihao;XIANG Hao;FANG Mengxiang(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;Qingshanhu Energy Research Center,Zhejiang University,Hangzhou 311300,China;Wuhan City Environment Protection Engineering Limited Company,Wuhan 430205,China)
出处
《高校化学工程学报》
北大核心
2025年第4期724-731,共8页
Journal of Chemical Engineering of Chinese Universities
基金
国家重点研发计划国际合作(2023YFE0199300)。
关键词
高炉煤气
混合胺
硫化氢
羰基硫
脱硫脱碳
blast furnace gas
mixed amine
hydrogen sulfide
carbonyl sulfide
desulfurization and decar⁃bonization
