title: Removal of carbon dioxide by a spray dryer.
abstract: With the global warming due to greenhouse effects becoming serious, many efforts are carried out to decrease the emissions of CO2 from the combustion of carbonaceous materials. In Taiwan, there are 19 large-scale municipal solid waste incinerators running and their total emission of CO2 is about 16,950 kton y-1. Spray dryer is the most prevailing air pollution control devise for removing acid gas in waste incineration; however, the performance of spray dryer on the removal of CO2 is seldom studied. This study employs a laboratory-scale spray dryer to investigate the removal efficiency of CO2 under different operating conditions. The evaluated parameters include different absorbents mixed with CaOH2, operating temperature, the concentration of absorbent, and the inlet concentration of CO2. Experimental results show that the best removal efficiency of CO2 by a spray dryer is 48% as the absorbent is 10%NaOH+5%CaOH2 and the operating temperature is 150 degrees C. Comparing this result with previous study shows that the performance of spray dryer is better than traditional NaOH wet scrubber. For NaOH+CaOH2 spray dryer, the removal efficiency of CO2 is decreased with the inlet concentration of CO2 increased and the optimum operating temperature is 150 degrees C. Except NaOH+CaOH2, absorbents DEA+CaOH2, TEA+CaOH2, and single CaOH2 are not effective in removing CO2 by a spray dryer.
authors.affiliation: Department of Environmental Engineering, Hung-Kuang University, No. 34, Chung-Chie Road, Shalu, Taichung County, Taiwan 43302, Province of China. jcchen@sunrise.hk.edu.tw
authors.forename: Jyh-Cherng
authors.initials: JC
authors.lastname: Chen
authors.forename: Guor-Cheng
authors.initials: GC
authors.lastname: Fang
authors.forename: Jun-Tian
authors.initials: JT
authors.lastname: Tang
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Liu
mesh_terms: D000042:Absorption; D000393:Air Pollutants / Q000737:chemistry / Q000302:isolation & purification*; D000397:Air Pollution / Q000517:prevention & control*; D002126:Calcium Hydroxide / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry / Q000302:isolation & purification*; D012037:Refuse Disposal / Q000295:instrumentation* / Q000379:methods*; D012972:Sodium Hydroxide / Q000737:chemistry; D013624:Taiwan; D013696:Temperature
chemical_list: D000393:Air Pollutants; D002245:Carbon Dioxide; D012972:Sodium Hydroxide; D002126:Calcium Hydroxide