Formulated absorbent for fine desulfurization and carbon capture of blast furnace gas based on alcohol amine solution

Abstract

The development of deep desulfurization of blast furnace gas combined with carbon capture is the key implementation point of pollution reduction and carbon reduction in the steel industry. Combined with the current situation of immature deep desulfurization technology and urgent demand for carbon capture, a CO2/COS（carbon oxysulfide）/H2S integrated high-efficiency removal formula absorbent was designed and developed. The main conclusions of this paper are as follows: The absorbent system for simultaneous deep removal of CO2, H2S and COS from blast furnace gas was constructed, and the formula absorbent composed of 1.5 mol/L MDEA + 0.5 mol/L MEA + 6% MOR + 4% DBU + 3% DDBAC was obtained. The total sulfur in the purified gas is less than 20 mg/Nm³, with a CO2 capture efficiency greater than 90%, and the regeneration rate of the formulated absorbent is above 80%, exhibiting excellent anti-corrosion and thermal stability performance. This research lays the foundation for the practical implementation of collaborative pollution reduction and carbon reduction in the steel industry. It integrates the achievement of ultra-low emissions and carbon reduction, providing significant environmental and economic benefits, and demonstrates important practical value and research significance.