Research on ammonia decarbonization of blast furnace gas to produce ammonium bicarbonate
Blast furnace gas presents high CO2 content,and the CO2 capture and resource utilization of blast furnace gas cannot only help to reduce carbon emissions in the iron and steel industry,but also increase the calorific value of blast furnace gas.The ammonia is employed as an absorbent to capture CO2(ammonia method),and the effects of ammonia concentration,gas-liquid ratio,reaction temperature and CO2 volume fraction of blast furnace gas on CO2 emission reduction are carried out.The results show that increasing the concentration of ammonia can significantly enhance the chemical adsorption of CO2 by ammonia,increasing the temperature of ammonia will accelerate the absorption rate of CO2,and increasing the liquid-gas ratio can make the contact between the liquid in the spray tower and CO2 more fully under the action of the spraying device,so increasing ammonia concentration,temperature and gas-liquid ratio can lead to the increase of CO2 removal rate.With the continuous introduction of CO2,the ratio of the amount of NH3 to CO2 decreases,and the reaction impetus decreases,which are not conducive to CO2 absorption.When the concentration of ammonia is 1.5 mol/L,the gas-liquid ratio is 1.3 L/m3,the reaction temperature is 20 ℃,and the CO2 volume fraction in blast furnace gas is 15％,the CO2 removal rate of ammonia method can reach 90.73％.The absorption solution is evaporated to obtain the white crystal product ammonium bicarbonate(NH3HCO3).
万方数据
维普
