掺杂高铝水泥钙基吸附剂碳酸化反应动力学特性研究  

Carbonation Kinetic Characteristics Study of Cao-based Adsorbents Doped With High Alumina Cement

作　　者：李志新 王勤辉[1] 方梦祥[1] 岑建孟[1] 骆仲泱 LI Zhixin;WANG Qinhui;FANG Mengxiang;CEN Jianmeng;LUO Zhongyang(State Key Laboratory of Clean Energy Utilization(Zhejiang University),Hangzhou 310027,Zhejiang Province,China)

机构地区：[1]能源清洁利用国家重点实验室(浙江大学),浙江省杭州市310027

出　　处：《中国电机工程学报》2022年第6期2208-2215,共8页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2019YFE0100100-05)。

摘　　要：钙基碳捕集技术是一种非常有前景的燃烧后碳减排技术。通过水合法制备了掺杂5%高铝水泥的新型低成本合成钙基吸附剂,在热天平装置上开展合成吸附剂在不同工况下(碳酸化温度(600~750℃),CO_(2)浓度(10%~40%CO_(2)))的碳捕集动力学测试研究,探索合成吸附剂多碳酸–煅烧循环后的吸附特性。吸附动力学实验结果表明合成钙基吸附剂的吸附效率随着碳酸化温度的逐渐升高呈现增大的趋势,而CO_(2)浓度对吸附剂的吸附性能影响不是很大,吸附剂快速反应阶段和扩散控制阶段的活化能分别为37.9kJ/mol和119.7kJ/mol。多循环实验结果表明合成吸附剂经过30次碳酸–煅烧实验后,吸附剂在750℃时吸附效率达到最大,稳定在23%,合成吸附剂第1次和30次碳酸–煅烧循环后的碳酸化动力学反应阶段活化能几乎相同。在实验的基础上,建立了颗粒吸附模型来并进一步成功解释了实验过程中钙基吸附剂烧结现象,结果表明吸附剂颗粒表面存在的烧结层导致CO_(2)扩散到颗粒内可反应的CaO表面的时间延长,引起合成吸附剂多次循环实验后反应曲线开始出现延迟段。CaO-based carbon capture technology is a very promising post-combustion carbon emission reduction technology.In this paper,the performance of a novel synthetic CaO adsorbent doped with 5%high-aluminum cement was prepared by hydration method.We explored the adsorption characteristics of synthetic adsorbent after multiple carbonation-calcination cycle.The adsorption kinetics experiment results showed that the adsorption efficiency of synthetic CaO-based adsorbent increased with the carbonation temperature gradually increased.CO;concentration had little effect on the adsorption performance of adsorbent.Multiple carbonation-calcination cycles results showed that the adsorption efficiency of adsorbent reached maximum at 750℃,which was steady at 23%after 30 carbonation-calcination cycles.The activation energy in carbonation reaction stage of the synthetic adsorbent after the first and 30 cycles was almost the same.The activation energy of rapid reaction stage and diffusion control stage for the synthetic adsorbent was 37.9kJ/mol and 119.7kJ/mol,respectively.The particle adsorption mode was further established to explain the phenomenon of CaO-based adsorbent deactivation.The results showed that the sintering layer on the surface of adsorbent particles led to the prolonged time of CO;diffusion to the surface of CaO molecules,which could be reacted in the particles.

关 键 词：钙基吸附剂 碳酸化 吸附效率 吸附模型 活化能 

分 类 号：TM91[电气工程—电力电子与电力传动]