Comparative experimental study on carbon removal by aqueous ammonia or MEA under oxy-enrich combustion

Experimental studies on decarbonization by aqueous ammonia under oxy-enrich combustion flue gas( 30 %~ 40 % v /v CO2) in a packed column are carried out compared with MEA. Effects of different operating and design parameters on CO2removal efficiency,including concentration of CO2,concentration of aqueous ammonia,aqueous ammonia flow rate,flue gas temperature,total gas flow rate and mole ratio of NH3to CO2are investigated. The research results show that when the concentration of aqueous ammonia is 6 %,and the CO2concentration is from 10 %( V/V) to 35 %( V/V),there is little change in removal efficiency. Improving concentration of aqueous ammonia and increasing flow rate of aqueous ammonia can increase removal efficiency of CO2respectively. When gas temperature is 50 ℃,the removal efficiency is the highest,and increasing flow rate of simulated flue gas can decline the removal efficiency. With the mole ratio of NH3to CO2increasing,the removal efficiency increases,and the magnitude of increase slow down. Under comparable conditions,by comparing,the results show that carbon removal by aqueous ammonia is better than MEA.