失活钙基吸收剂环境中自活化机理

doi:10.16085/j.issn.1000-6613.2018-2382

化工进展 ›› 2019, Vol. 38 ›› Issue (9): 4302-4307.DOI: 10.16085/j.issn.1000-6613.2018-2382

失活钙基吸收剂环境中自活化机理

叶江明(),梁绍华,张思文,孙荣岳(),毕小龙

南京工程学院能源与动力工程学院，江苏南京 211167

收稿日期:2018-12-10 出版日期:2019-09-05 发布日期:2019-09-05
通讯作者: 孙荣岳
作者简介:叶江明（1964—），男，硕士，教授，研究方向为电站锅炉燃烧优化与节能改造。E-mail: jmynj@njit.edu.cn。
基金资助:
国家自然科学基金(51706094);南京工程学院引进人才科研启动基金(YKJ201407)

Self-activation mechanism of the spent calcium-sorbent under environmental conditions

Jiangming YE(),Shaohua LIANG,Siwen ZHANG,Rongyue SUN(),Xiaolong BI

School of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, Jiangsu, China

Received:2018-12-10 Online:2019-09-05 Published:2019-09-05
Contact: Rongyue SUN

摘要/Abstract

摘要：

将经历多次循环后失活的钙基吸收剂置于环境中吸水自活化，通过XRD分析了自活化过程吸收剂物相演变规律，在双固定床反应器系统上分析了吸水率对失活钙基吸收剂循环捕集CO₂性能的影响规律，通过SEM和N₂吸附分析了自活化提高钙基吸收剂循环碳酸化转化率的机理。结果表明：失活钙基吸收剂首先吸收环境中水分生成Ca(OH)₂，当吸水率达到100%后继续吸水生成Ca(OH)₂?2H₂O，自活化极限为170%；自活化可以提高失活钙基吸收剂循环碳酸化转化率，自活化后钙基吸收剂循环捕集CO₂性能与吸水率呈线性比例关系，重复自活化可再次提高吸收剂循环碳酸化转化率；自活化过程中，失活钙基吸收剂颗粒表面重新生成孔隙，比孔容和比表面积增加，有利于吸收剂中CO₂的扩散，因此自活化后钙基吸收剂循环捕集CO₂性能提高。

关键词: 钙循环, 失活钙基吸收剂, 自活化机理

Abstract:

The spent Ca-based sorbent after multiple calcination/carbonation cycles was put in the natural environment to be activated by absorbing the water in the environment. XRD analysis was employed to analyze the phase transition of the sorbent during the self-activation process. The CO₂ capture capacity of the sorbent after self-activation was then tested in a dual fixed-bed reactor. SEM and N₂ adsorption were employed to explain why self-activation process can enhance the CO₂ capture capacity of the spent sorbent. The results showed that the spent sorbent firstly absorbed the water in the environment to form Ca(OH)₂. The CaO in the sorbent completely converted to Ca(OH)₂ when the value of φ was 100%, and after that the sorbent continued to adsorb water to form Ca(OH)₂?2H₂O until the value of φ reach 170%. The self-activation process can enhance the carbonation conversion of the spent sorbent. The CO₂ capture capacity of the sorbent after self-activation process was proportional to the value of φ. Repetitive self-activation can enhance the carbonation conversion of the sorbent once again. Many new pores were formed on the grain surface of the spent sorbent during the self-activation process, and the values of pore volume and BET surface area increased, which made it easier for the diffusion of CO₂ in the sorbent to react with CaO. That is why self-activation process can enhance the CO₂ capture capacity of the spent sorbent.

Key words: calcium looping process, spent Ca-based sorbent, self-activation mechanism

中图分类号:

TQ534.9

叶江明,梁绍华,张思文,孙荣岳,毕小龙. 失活钙基吸收剂环境中自活化机理[J]. 化工进展, 2019, 38(9): 4302-4307.

Jiangming YE,Shaohua LIANG,Siwen ZHANG,Rongyue SUN,Xiaolong BI. Self-activation mechanism of the spent calcium-sorbent under environmental conditions[J]. Chemical Industry and Engineering Progress, 2019, 38(9): 4302-4307.

图/表 8

图1 钙循环捕集CO2 技术工艺流程

图2 失活钙基吸收剂自活化时吸水率随时间变化规律

图3 自活化过程中钙基吸收剂物相演变规律

图4 吸水率对自活化后钙基吸收剂循环捕集CO2 性能的

图5 重复自活化对钙基吸收剂循环捕集CO2 性能的影响

图6 XN ,R10与自活化过程中吸水率φ的关系

图7 自活化过程中不同吸水率的钙基吸收剂煅烧后SEM分析

图8 吸水率φ对煅烧后钙基吸收剂比孔容和比表面积的影响

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失活钙基吸收剂环境中自活化机理

Self-activation mechanism of the spent calcium-sorbent under environmental conditions

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