Research progress of CO2 capture by using ammonia from flue gas of power plant

With the coming of the post-Kyoto period, CO2 removal by using ammonia solutions has become an emerging, hot research subject in the recent years. This paper focuses on the related researches on the mechanism of CO2 removal by the ammonia method, major technical details and parameters, and gives a detailed summary and analysis. Some conclusions of the researches, existing problems and the future of this technology are described. The results of the experiments and simulations show that the efficiency of CO2 removal by ammonia solutions could reach more than 90% and the CO2 absorption capacity might be above 1.0 kg CO2/kg NH3. Experimental results show that CO2 removal efficiency, absorption capacity and absorption rate mainly depend on the concentration of aqueous ammonia, reaction temperature of absorption and conditions for reagent regeneration. The economic analysis tells that the combined removal of acid gases and heavy metal from flue gas by using ammonia might achieve the goal of only 20% increase in the cost of electricity (COE).