高效低能耗氨基酸盐水溶液固-液相变吸收剂捕集CO_(2)性能探究  

Study on amino acid salt aqueous solid-liquid phase change absorbent for energy-efficient CO_(2) capture

作　　者：顾永正 李晓辉 高歌 李小姗 熊卓 GU Yongzheng;LI Xiaohui;GAO Ge;LI Xiaoshan;XIONG Zhuo(Guodian Power Development Co.,Ltd.,Beijing 100101,China;Guoneng Sanhe Power Generation Co.,Ltd.,Langfang 065201,Hebei,China;State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)

机构地区：[1]国电电力发展股份有限公司,北京100101 [2]国能三河发电有限责任公司,河北廊坊065201 [3]华中科技大学能源与动力工程学院煤燃烧与低碳利用全国重点实验室,湖北武汉430074

出　　处：《低碳化学与化工》2025年第4期122-130,共9页Low-Carbon Chemistry and Chemical Engineering

基　　金：国家重点研发计划(0270120160);河北省重点研发计划(22373708D)。

摘　　要：利用传统有机胺水溶液捕集CO_(2)的再生能耗较高,制约了其在CO_(2)捕集领域的广泛应用。为降低吸收剂的再生能耗,提出了一种高效低能耗氨基酸盐水溶液固-液相变吸收剂。制备了不同浓度的L-苏氨酸钾溶液(PL-T)作为固-液相变吸收剂,研究了其CO_(2)吸收、解吸过程,并对吸收、解吸速率,以及反应热、显热等进行了评价。结果表明,在吸收、解吸温度分别为313 K、363 K下,当PL-T浓度为4 mol/L时,吸收、解吸速率均达到最大值,分别为2.20×10^(-5)mol/s、1.43×10^(-4)mol/s。在313 K下,5 mol/L PL-T与CO_(2)的反应热为-80.94 kJ/mol,其绝对值小于5 mol/L单乙醇胺溶液对应值(-88.22 kJ/mol),因此解吸能耗更低;当只解吸5 mol/L PL-T的固相沉淀物时,其显热可较5 mol/L MEA降低51.4%。High regeneration energy consumption for CO_(2) capture by traditional aqueous amine solution is still one of the bottlenecks restricting its wide application in CO_(2) capture field.In order to reduce the regenerative energy consumption of the absorbent,an energy-efficient amino acid solution solid-liquid phase change absorbent was proposed.Potassium L-threonine solutions(PL-T)with different concentrations were prepared as the solid-liquid phase change absorbent.The CO_(2) absorption and desorption processes of PL-T were investigated,and the absorption and desorption rates,reaction heat and sensible heat were evaluated.The results show that under absorption and desorption temperatures of 313K and 363 K,respectively,the absorption and desorption rates both reach the maximum values with PL-T concentration of 4 mol/L,which are 2.20×10^(-5) mol/s and 1.43×10^(-4) mol/s,respectively.Under 313 K,the reaction heat of 5 mol/L PL-T with CO_(2) is-80.94 kJ/mol,and its absolute value is less than the corresponding value(-88.22 kJ/mol)of 5 mol/L monoethanolamine solution,leading to a lower desorption energy consumption.When only solid precipitate of 5 mol/L PL-T is desorbed,its sensible heat can be reduced by 51.4%,compared to 5 mol/L MEA.

关 键 词：CO_(2)捕集 固-液相变吸收剂 氨基酸盐 再生能耗 反应热 显热 

分 类 号：TQ028[化学工程]