Abstract:Carbon capture of blast furnace flue gas can effectively reduce the carbon emissions of blast furnace process. The carbon capture of blast furnace flue gas was carried out by chemical absorption, and the carbon capture capacity of blast furnace flue gas of several main absorbents was studied. Through the self-built simulated carbon capture experimental device, the carbon capture of blast furnace flue gas with 20% CO2 content by absorbents such as ammonia hydroxide and ethanolamine (MEA) was studied, and its carbon capture capacity and regeneration and reuse capacity were analyzed. The results show that ammonia hydroxide has the strongest CO2 capture capacity, reaching 105.4 L of CO2 per kilogram solution, which is 71.38 % higher than that of MEA solution with the least capture capacity. In addition, the CO2 desorption rate of each absorbent can reach more than 92%, and only the MEA desorption rate is 68.94%. The carbon capture capacity of the reused absorbent also reaches more than 90% of the original. At the same time, it is found that the dust in the blast furnace flue gas will degrade the organic amine absorbent during the process of heating and desorption, and reduce the carbon capture capacity by about 20%. This paper can lay a theoretical foundation for the subsequent development of absorbent and blast furnace carbon capture process suitable for blast furnace process.