双组分混合有机胺溶液吸收沼气中CO_2的传质性能  

Mass Transfer Performance of CO_2 Absorption by Two-component Blended Organic Amine Solutions for Biogas Purification

作　　者：李虎[1] 刘应书[1,2] 张辉[1,2] 郑新港[3] 杨雄[1,2] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]北京科技大学北京高校节能与环保工程研究中心,北京100083 [3]中国科学院过程工程研究所,北京100083

出　　处：《过程工程学报》2015年第3期386-392,共7页The Chinese Journal of Process Engineering

基　　金：国家高技术研究发展计划(863)基金资助项目(编号:2012AA101802-3);中央高校基本科研业务费专项资金资助项目(编号:FRF-TP-14-037A2)

摘　　要：在填料塔中,对以二乙醇胺(DEA)为基础溶剂,以N-甲基二乙醇胺(MDEA)、(N-2-羟乙基)乙二胺(AEE)、二乙烯三胺(DETA)、三乙烯四胺(TETA)为添加剂的二元混合胺溶液吸收沼气中高浓度CO2的传质性能进行了实验研究,考察了添加剂浓度及种类对吸收过程中CO2脱除率n、总体积传质系数KGae、气液相传质阻力的影响.结果表明,双组分混合有机胺溶液中,以AEE,DETA和TETA为添加剂时,KGae和随添加剂浓度增加而增大,气相传质系数kG及气相阻力占总阻力的分率减小,液相阻力占总阻力的分率增大;以MDEA为添加剂时趋势相反n和KGae沿塔高方向增大,其在4种溶液中的大小为DEA-TETA>DEA-DETA>DEA-AEE>DEA-MDEA.An experimental packed tower was set up to study the absorption of high-concentration CO2 in aqueous solutions of blended organic amine with diethanolamine （DEA） as base solvent, and N-methyldiethanolamine （MDEA）, （N-2-hydroxyethyl） ethylenediamine （AEE）, diethylenetriamine （DETA） and triethylenetetramine （TETA） as additives respectively. The effects of concentration and species of additives on the mass transfer performance, such as conversion rate of CO2 r/, volumetric overall mass transfer coefficient Kc, ae, and gas and liquid phase mass transfer resistance, were systematically examined. The results show that KGae and r1 increase with increasing of additive concentration when AEE, DETA and TETA are taken as additives. And the gas phase mass transfer coefficient kG and gas phase mass transfer resistance decrease, but liquid phase mass transfer resistance increases. For the additive of MDEA, the trends were just contrary to the above. In the absorption process of CO2 in two-component blended organic amine solutions, the values of Koae and η increase along the tower packing height, which follow the order of DEA-TETA 〉 DEA-DETA 〉 DEA-AEE 〉 DEA-MDEA.

关 键 词：沼气提纯CO2 吸收 填料塔 混合有机胺 传质 

分 类 号：TQ028.2[化学工程]