Kenics型静态混合器强化NaOH溶液吸收CO_(2)的实验分析  

Experimental analysis of enhanced absorption of CO_(2) by NaOH solution in Kenics static mixer

作　　者：禹言芳[1] 于恒磊 孟辉波 张埔瑜 Yanfang YU;Henglei YU;Huibo MENG;Puyu ZHANG(Liaoning Key Laboratory of Chemical Technology for Efficient Mixing,Shenyang University of Chemical Technology,Shenyang,Liaoning 110142,China;College of New Energy,China University of Petroleum(East China),Qingdao,Shandong 266580,China)

机构地区：[1]沈阳化工大学辽宁省高效化工混合技术重点实验室,辽宁沈阳110142 [2]中国石油大学(华东)新能源学院,山东青岛266580

出　　处：《过程工程学报》2024年第10期1149-1157,共9页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:21476142);辽宁省教育厅重点项目(编号:LJKMZ20220773);辽宁省自然科学基金(编号:2022-MS-290);青岛市自然科学基金原创探索项目(编号:23-2-1-236-zyyd-jch);中国石油大学(华东)引进人才科研基金资助项目(编号:R20220113)。

摘　　要：碳达峰和碳中和的“双碳”目标一直备受关注,目前二氧化碳排放过多导致的全球变暖问题十分严重。为了缓解全球生态问题,需要对CO_(2)捕集技术进行研究与开发。为丰富静态混合器在CO_(2)吸收领域的应用,将Kenics型静态混合器(KSM)作为强化反应设备。基于氢氧化钠溶液与二氧化碳(NaOH-CO_(2))体系,对KSM和空管两种结构下不同采样位置及气液流率的CO_(2)吸收效率进行分析对比。使用自动电位滴定法对CO_(2)吸收效率进行测量。结果表明,在气相流率(Q_G)为6 L/min,液相流率(Q_L)为17 L/min,采用KSM的CO_(2)最大吸收效率比空管结构提高了72.3%。一定Q_(G)下,空管结构的CO_(2)的吸收效率随Q_(L)增加而下降,而管道内装有KSM元件时,CO_(2)的吸收效率随Q_L增大而上升。对KSM结构的体积能量耗散率(ε)进行分析,管道装备KSM元件时,CO_(2)吸收效率达90%以上,最小ε=4.85 m^(2)/s^(3)。在管道Z_1到Z_2段,当Q_G=6 L/min时,气液混合总流率(Q_(T))从20 L/min增至22 L/min,ε增大了14.7%。当Q_(L)=14 L/min时,Q_(T)从20 L/min增至22 L/min,ε增大了7.83%。ε受Q_(L)影响大于Q_(G),在管道Z_1到Z_(2)段,系统能量消耗及反应较为剧烈。达西摩擦系数(f)随液相表观流速(U_(L))和气相表观流速(U_G)增加均出现下降趋势。基于实验数据拟合得到U_(G),U_(L)和f之间的经验关联式,R^(2)=0.999,关联式偏差为-0.88%~0.82%。The carbon peaking and carbon neutrality goals has been concerned,and the current global warming problem caused by excessive carbon dioxide emissions is very serious.In order to alleviate global ecological problems and better achieve the dual-carbon strategy,the research and development of carbon dioxide capture technology is indispensable.In order to enrich the application of static mixers in the field of carbon dioxide absorption,Kenics static mixer(KSM)was used as the enhanced reaction equipment.Based on sodium hydroxide aqueous solution and carbon dioxide(NaOH-CO_(2))system,the absorption efficiency of carbon dioxide concentration in the range of 25%~33% volume concentration was analyzed using KSM and empty tube structures under different sampling positions and gas-liquid flow rates.The absorption efficiency of carbon dioxide was measured by automatic potentiometric titration.The absorption performance of the KSM structure was compared with that of the empty pipe.The results showed that the maximum absorption efficiency of CO_(2) in KSM was 72.3%higher than that of the empty pipe.The absorption efficiency of CO_(2) decreased with the increase of the liquid phase flow rate(Q_(L))at a certain gas phase flow rate(QG)in the empty pipe structure.In contrast,the absorption efficiency of CO_(2) increased with the increase of QL when KSM elements were installed in the pipe.The volume energy dissipation rate(ε)of KSM structure was analyzed,and it was concluded that the minimumεwas 4.85 m^(2)/s^(3) when the CO_(2) absorption efficiency reached more than 90%.Theεincreased by 14.7%when total gas-liquid flow rate(Q_(T))varied from 20 L/min to 22 L/min at Q_(G)=6 L/min from the first sampling point(Z1)to second sampling point(Z2)in the pipeline.However,theεincreased by 7.83%when Q_(T) changed in the same range at Q_(L)=14 L/min.The results showed that the change ofεwas more affected by Q_(L) than Q_(G),and the system energy consumption and reaction were more obvious from Z1 to Z2 in the pipeline.When the gas superfici

关 键 词：静态混合器 强化反应 吸收效率 体积能量耗散率 达西摩擦系数 

分 类 号：TQ051.71[化学工程]