Zr-Mg改性吸附剂捕集热解气中CO_(2)的实验研究  

Experiment Study of Capturing CO_(2) from Pyrolysis Gases by Zr-Mg Modified Sorbents

作　　者：唐玉婷[1] 陈晓斌 马晓茜[1] TANG Yuting;CHEN Xiaobin;MA Xiaoqian(School of Electric Power Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China)

机构地区：[1]华南理工大学电力学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2022年第7期118-125,143,共9页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家重点研发计划项目(2018YFC1901200)。

摘　　要：随着经济的不断发展和城市化进程的加快,城市生活垃圾的产量日益增长,给人们的日常生活和健康带来了极大的影响,如何将其资源化、减量化、无害化地处理成为当前亟需解决的问题。对城市生活垃圾进行热解处理,是解决当前“垃圾围城”和资源短缺的有效途径,但热解气中含量过高的CO_(2)会影响其后续的燃烧利用。钙基吸附剂因具有来源广泛、造价低廉和吸附容量大等特点,被认为是最具市场应用前景的CO_(2)捕集材料之一。但常规的钙基吸附剂随着循环使用次数的增加,吸附性能会迅速衰减。针对这个问题,本研究利用共沉淀法制备了金属Zr和Mg同时掺杂的改性钙基吸附剂,通过固定床实验分析了Zr掺杂比、Mg掺杂比、碳酸化温度、煅烧温度对改性钙基吸附剂循环反应特性的影响规律。实验结果表明,金属Mg和Zr的掺杂比例不宜过高或过低,最佳的掺杂比例(即附剂中Ca、Mg、Zr物质的量比)为10∶1∶0.5。因为掺杂比例过低不足以延缓吸附剂的烧结,而掺杂比例过高会导致吸附剂中CaO的含量和表面上的活性反应位点减少。当掺杂比例为10∶1∶0.5的吸附剂分别在700℃吸附和900℃煅烧时,具有最佳的吸附性能,10次循环后的平均碳酸化转化率为76.3%。同时,本实验制备的掺杂比为10∶1∶0.5的吸附剂在700℃时对热解气中的CO_(2)捕集率高达83.8%。With the development of economy and accelerated urbanization,the increasing production of municipal solid wastes brings great impact on people’s daily life and health.How to recycle,reduce and harmlessly treat solid wastes has become an urgent problem.The pyrolysis of municipal solid wastes is an effective way to solve the cur⁃rent“garbage siege”and resource shortage,but the high content of CO_(2)in the pyrolysis gas will affect its subse⁃quent combustion and utilization.Calcium-based sorbents are considered as one of the most promising CO_(2)capture materials due to their wide source,low cost and high adsorption capacity.However,the adsorption performance of conventional calcium-based sorbents decays rapidly as the number of cycles increases.To address this problem,this study prepared modified calcium-based sorbents doped with metal Zr and Mg by co-precipitation method.The effects of doping ratios of Zr and Mg,carbonation temperature and calcination temperature on the modified calciumbased sorbents were obtained by fixed bed reactor.The experimental results show that the doping ratios of metal Mg and Zr should not be too high or too low,and the optimal doping ratio(the molar ratios of Ca,Mg and Zr)is 10∶1∶0.5.Because too low doping ratio will retard the sintering of the sorbent,while too high doping ratio will lead to the reduction of CaO content and active reaction sites on the surface of the sorbent.The sorbent with the doping ratio of 10∶1∶0.5 has the best adsorption performance when adsorbed at 700°C and calcined at 900°C,respectively,with an average carbonation conversion of 76.3%after ten cycles.When applying on product gas,the capture ratio of CO_(2)reaches 83.8%with 10∶1∶0.5 doping ratio under 700℃ carbonation temperature.

关 键 词：热解气 钙基吸附剂 CO_(2)捕集 金属掺杂 碳酸化转化率 

分 类 号：TK16[动力工程及工程热物理—热能工程]