负载PO43-的离子交换树脂膜在烟气中变湿吸附CO_(2)的性能研究  

Study on performance of ion exchange resin membranes loaded with PO43-for moisture-swing adsorption of CO_(2) from flue gas

作　　者：王凯[1] 李锋 郑世强 成欣悦 朱亮亮 陈曦[3] WANG Kai;LI Feng;ZHENG Shiqiang;CHENG Xinyue;ZHU Liangliang;CHEN Xi(School of Chemical Engineering,Northwest University,Xi’an 710069,Shaanxi,China;Shaanxi Institute of Energy and Chemical Engineering,Xi’an 710069,Shaanxi,China;Department of Earth and Environmental Engineering,Columbia University,New York NY 10027,New York,America)

机构地区：[1]西北大学化工学院,陕西西安710069 [2]陕西省能源化工研究院,陕西西安710069 [3]哥伦比亚大学地球与环境工程系,纽约州纽约市NY10027

出　　处：《低碳化学与化工》2023年第3期140-147,共8页Low-Carbon Chemistry and Chemical Engineering

基　　金：国家自然科学基金青年科学基金(12002271);西安市科协青年人才托举计划(095920221368)。

摘　　要：基于磷酸根(PO_(4)^(3−))在纳米界面上的可逆水解反应,负载PO_(4)^(3−)的纳米多孔材料能够实现低能耗变湿吸附空气中的CO_(2),但PO4变湿吸附剂在烟气中的CO_(2)捕集性能尚未有系统的实验研究。基于负载PO_(4)^(3−)的离子交换树脂膜,探究了PO_(4)^(3−)变湿吸附剂在不同进气CO_(2)浓度(体积分数,下同)、混合气体温度及混合气体流量下的CO_(2)吸附性能。结果表明,吸附环境中进气CO_(2)浓度和混合气体温度的提高,可以有效增加PO_(4)^(3−)变湿吸附剂的CO_(2)平衡吸附量。当吸附环境中的进气CO_(2)浓度从3.5%提高至15.0%时,PO_(4)^(3−)变湿吸附剂的CO_(2)平衡吸附量从0.22 mol/kg提高至0.33 mol/kg;吸附环境中的进气CO_(2)浓度一定时(5.0%),混合气体温度从10℃提高至50℃,PO_(4)^(3−)变湿吸附剂的CO_(2)平衡吸附量从0.19 mol/kg提高至0.25 mol/kg。此外,基于对微观尺度气体扩散和干燥吸附的相关机制的研究,发现随着入口处混合气体流量和混合气体温度的提高,可以有效缩短PO_(4)^(3−)变湿吸附剂的吸附饱和时间。当混合气体流量从5 L/min增大至20 L/min时,PO_(4)^(3−)变湿吸附剂的CO_(2)吸附饱和时间从135 min缩短至43 min;当混合气体温度从10℃升高至50℃时,PO_(4)^(3−)变湿吸附剂的CO_(2)吸附饱和时间从120 min缩短至43 min。PO_(4)^(3−)变湿吸附剂在较高进气CO_(2)浓度、混合气体温度和混合气体流量下的吸附性能提升,为实现烟气中低能耗捕集CO_(2)提供了可能。Based on the reversible hydrolysis reaction of phosphate radical(PO_(4)^(3-))on the nano-interface,nano-porous materials loaded with PO_(4)^(3-)can achieve moisture-swing adsorption of CO_(2) with low energy consumption in the air.However,there is no systematic experimental study on the CO_(2) capture performance of PO_(4)^(3-)moisture-swing sorbent in flue gas.Based on the ion exchange resin membrane loaded with PO_(4)^(3-),the CO_(2) adsorption performance of PO_(4)^(3-)moisture-swing sorbent under different intake CO 2 concentrations(volume fraction,the same below),mixed gas temperatures and mixed gas flow rates was investigated.The results show that the increase of intake CO_(2) concentration and mixture temperature in adsorption environment can effectively increase the CO_(2) equilibrium adsorption capacity of PO_(4)^(3-)moisture-swing sorbent.When the intake CO_(2) concentration in adsorption environment increases from 3.5%to 15.0%,the CO_(2) equilibrium adsorption capacity of PO_(4)^(3-)moisture-swing sorbent increases from 0.22 mol/kg to 0.33 mol/kg.The CO_(2) equilibrium adsorption capacity of PO_(4)^(3-)moisture-swing sorbent increases from 0.19 mol/kg to 0.25 mol/kg when the temperature of mixing gas increases from 10℃ to 50℃ with constant intake CO_(2) concentration in the environment(5.0%).In addition,based on the research of the relevant mechanisms of micro-scale gas diffusion and drying adsorption,it is found that CO_(2) adsorption saturation time of PO_(4)^(3-)moisture-swing sorbent can be effectively shortened by increasing the flow rate and temperature of the mixed gas at the entrance.CO_(2) adsorption saturation time of PO_(4)^(3-)moisture-swing sorbent decreases from 135 min to 43 min when the mixed gas flow rate increases from 5 L/min to 20 L/min.With the temperature of mixed gas increases from 10℃ to 50℃,CO_(2) adsorption saturation time of PO_(4)^(3-)moisture-swing sorbent decreases from 120 min to 43 min.The improved adsorption performance of PO_(4)^(3-)moisture-swing sorbent at hi

关 键 词：CO_(2) 吸附 变湿吸附剂 磷酸根 烟气 

分 类 号：TQ09[化学工程] X701[环境科学与工程—环境工程]