含硫高炉煤气氛围下混合胺吸收剂的脱碳性能

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文章编号：1003-9015（2025）04-0724-08

中图分类号：TQ546.5;TQ421.1 文献标志码：A DOI：10.3969/j.issn.1003-9015.2025.00.029

Abstract：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 sulfide（COS）in blast furnace gas on the performance of mixed amine absorbents in absorbing carbon dioxide（ CO2 ） and their reaction characteristics during the chemical absorption decarbonization process，four mixed amine absorbents were formed by using methyl diethanolamine （MDEA）as the main agent and adding piperazine （PZ），aminoethylpiperazine（AEP），2-（methylamino）ethanol（MMEA）and 2-（ethylamino）ethanol（EMEA）， respectively. Additionally，ethanolamine solution （30% MEA，mas fraction）and 40% MDEA solution were used as control groups. The removal rates of H2 S and COS，the absorption rate，regeneration rate and cycle capacity of （20号 CO2 in the mixed amine absorbents under the atmosphere of sulfur-containing blast furnace gas were tested. The results showed that the absorption rate，regeneration rate and cycle capacity of CO2 in the MDEA + PZ and MDEA + （204 AEP systems were higher than those in the MDEA + MMEA and MDEA + EMEA systems.Piperazine and its derivatives had a better activation effect on tertiary amines than secondary amines.Among them，the CO2 cycle capacity of the 20% MDEA + 20% PZ absorbent formulation reached 1.87mol⋅L-1 ，which was 86.2% higher than that of （204 30% MEA.The removal rate of H2S was higher than 90% ，and it exhibited high CO2 absorption and regeneration effects and good desulfurization capacity，making it an excelent formula fordesulfurization and decarbonization of blast furnace gas. The study also found that trace H2S and COS had a small impact on the CO 2 absorption and regeneration performances and did not significantly affect the CO2 absorption rate and cycle capacity. The research providesa theoretical reference fortheapplicationof chemical absorptioncarboncapture in theactualengineering of blast furnace gas decarbonization.

Key words： blast furnace gas；mixed amine；hydrogen sulfide；carbonyl sulfide；desulfurization and decarbonization

1前言

2023年我国粗钢产量为10.19亿吨，其中 90% 的粗钢通过高炉-转炉工艺生产。（剩余11584字）