氨水与MEA喷雾捕集CO_2能力的比较  

Comparison of Capture Efficiencies of Carbon Dioxide by Fine Spray of Aqueous Ammonia and MEA Solution

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：《高校化学工程学报》2010年第3期514-517,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：北京市科委科技计划课题资助(Z08040902950803)

摘　　要：为了研究喷雾捕集CO2技术的可行性,并比较新型吸收剂——氨水与传统吸收剂——MEA喷雾捕集CO2的能力,用微细雾化喷头将氨水与MEA溶液雾化,在喷雾塔中与模拟烟气逆向接触。研究了不同的氨水与MEA浓度、氨水与MEA流量、气体总流量、温度对CO2脱除率的影响。实验结果表明,喷雾捕集CO2技术可达很高的CO2脱除率(96.0%以上);CO2脱除率随着氨水、MEA浓度和流量的提高而增大,其中流量提高时MEA吸收CO2的脱除率增大幅度较大,可由36.9%增加到63.2%;随烟气流量的增大,MEA和氨水吸收CO2的脱除率分别下降16.5%和17.3%。在可比条件下,与相同浓度的MEA溶液相比,氨水脱除CO2的能力较强。In order to investigate the feasibility of using fine spray method to capture CO2 and compare the CO2 capturing capabilities of new absorbent—aqua ammonia and conventional absorbent —MEA, experimental studies on CO2 capture were carried out in a spray scrubber, in which the fine spray of MEA and ammonia solution respectively contacted reversely with the artificial flue gas. The effects of different operation parameters, such as absorbent concentration, liquid flow rate, total gas flow rate and initial temperature, on CO2 removal efficiency were investigated. The experimental results show that using fine spray method to capture CO2 can reach a very high CO2 removal efficiency （above 96.0%）, and the higher concentration and flow rate of the aqueous ammonia or MEA solution are beneficial to promote the CO2 removal efficiency. With the increase of the absorbent flow rate, the CO2 removal efficiency of using MEA can increase from 36.9% to 63.2%, this increment is higher than that of using aqueous ammonia as absorbent. On the other hand, with increasing the total gas flow rate, the CO2 removal efficiencies of using MEA solution and aqueous ammonia decrease 16.5% and 17.3%, respectively. However, under comparable conditions and with the same absorbent concentration, the CO2 removal efficiency of using aqueous ammonia is higher than that of using MEA solution.

关 键 词：CO2 喷雾 吸收 氨水 一乙醇胺(MEA) 

分 类 号：X701.7[环境科学与工程—环境工程] TQ028.14[化学工程]