MEA、NaOH与氨水喷雾捕集CO_2性能  

Carbon dioxide removal efficiencies by fine sprays of MEA,NaOH and aqueous ammonia solutions

作　　者：牛振祺[1] 郭印诚[1] 林文漪[1] 

机构地区：[1]清华大学工程力学系,北京100084

出　　处：《清华大学学报（自然科学版）》2010年第7期1130-1134,1140,共6页Journal of Tsinghua University(Science and Technology)

基　　金：北京市科委科技计划课题(Z08040902950803)

摘　　要：为验证喷雾捕集CO2技术的可行性,并比较一乙醇胺(monoethanolamine,MEA)溶液、NaOH溶液和氨水喷雾捕集CO2的性能,该文用微细雾化喷头将吸收剂雾化,在喷雾塔中与模拟烟气逆向接触。30～40μm的雾滴直径使气液接触面积迅速增加的同时,雾滴的旋转运动又增强了气液两相界面的湍动程度。研究了三种溶剂的浓度和流量、气体总流量、温度以及CO2初始进口浓度对CO2脱除率的影响。实验结果表明:喷雾捕集CO2技术是可行的,在较低的浓度下可实现很高的CO2脱除率;在可比条件下,氨水喷雾捕集CO2的性能最好,NaOH溶液次之,MEA溶液最差。The feasibility of capturing CO2 by a fine spray of monoethanolamine（MEA）,NaOH or aqueous ammonia solutions was studied experimentally in a spray scrubber.Fine sprays of these three absorbents contacted the artificial flue gas in a counter flow design in the reactor.The mean diameter of the spray droplets was 30～40 μm,which rapidly increases the gas-liquid contact area,while rotation of the droplets enhances the turbulent motion of the gas-liquid interface.The tests inverstigated the effects of different operating and design parameters,including the concentrations of these three absorbents,liquid flow rate,total gas flow rate,and the initial carbon dioxide concentration on the CO2 removal efficiency.The results show that CO2 capture by these fine sprays can achieve very high CO2 removal efficiencies using low concentrations of absorbent.In general,the carbon dioxide removal efficiency by aqueous ammonia is the highest among these three absorbents,with the NaOH solution being lower,and the MEA solution the lowest.

关 键 词：CO2 喷雾 吸收 一乙醇胺 氢氧化钠 氨水 

分 类 号：X701.7[环境科学与工程—环境工程]