Research on mass transfer of CO2 absorption using ammonia solution in spray tower

摘要

Research on mass transfer of carbon capture process plays an important role in the design of absorbing device. The effects of ammonia concentration, L/G, gas flow rate, gas temperature, CO_2 partial pressure and other factors on the volumetric overall mass transfer coefficient (K_Ga_v), the gas phase mass transfer coefficient (K_G) and the effective mass transfer cross-sectional area (a_v) were investigated with ammonia solution as the absorbent in homemade spray tower. Experimental results show that K_Ga_v has upward trend with the increasing ammonia concentration, L/G and gas flow rate, and first increases and then decreases with the rises of CO_2 partial pressure and gas temperature; K_G increases with the increasing L/G, gas flow rate and CO_2 partial pressure; a_v increases with the increasing ammonia solution and gas flow rates; C02 partial pressure has less impact on K_Ga_v,K_G and a_v. Under the experimental conditions, maximums of K_Ga_V, K_G and a_v are 0.17 kmol m~(-3) h~(-1) kPa~(-1); 0.0022 kmol kPa m~(-2) h~(-1) and 99.25 m~2 m~(-3) respectively.