H_(2)O和SO_(2)对钙循环捕集CO_(2)碳酸化过程协同效应的研究  

Study on Synergistic Effect of H_(2)O and SO_(2) During Carbonation on CO_(2) Capture in Calcium Looping Cycle

作　　者：戴文浩 王春波[1] 陈亮[1] 方远[1] 袁峰 闫广精 DAI Wenhao;WANG Chunbo;CHEN Liang;FANG Yuan;YUAN Feng;YAN Guangjing(Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,Department of Power Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China;China Urban Construction Design&Research Institute,Beijing 100120,China)

机构地区：[1]华北电力大学动力工程系,河北省低碳高效发电技术重点实验室,河北保定071003 [2]中国城市建设研究院有限公司,北京100120

出　　处：《动力工程学报》2022年第8期784-792,共9页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51976059);河北省自然科学基金资助项目(E2020502018);中央高校基本科研业务费专项资金资助项目(2020MS101)。

摘　　要：采用自制恒温热重系统研究了H_(2)O和SO_(2)对钙循环捕集CO_(2)的协同效应,并结合吸收剂的孔径进行了机理分析。结果表明:气氛中的H_(2)O加速了碳酸化快速反应阶段的反应速度,改善了CaO颗粒的孔结构,从而提高了碳酸化转化率;气氛中的SO_(2)阻碍了CO_(2)的捕集,使碳酸化转化率下降,且随循环进行碳酸化转化率下降更加明显;当H_(2)O和SO_(2)协同作用于碳酸化过程时,钙循环特性受H_(2)O和SO_(2)的协同效应影响:加入0.05%体积分数的SO_(2)后,当H_(2)O体积分数从0%增加至20%时,吸收剂孔容积逐步上升,CO_(2)捕集能力得到改善;加入10%体积分数的H_(2)O后,当SO_(2)体积分数从0%增加至0.1%时,吸收剂孔隙堵塞更加严重,CO_(2)捕集能力下降,但是相较于无H_(2)O工况,仍保持更高的碳酸化转化率;H_(2)O和SO_(2)的协同效应主要体现在H_(2)O可以减弱SO_(2)对CO_(2)捕集的阻碍作用,从而提高吸收剂的碳酸化转化率。Synergistic effect of H_(2)O and SO_(2)on the cyclic capture of CO_(2)was studied by a homemade thermostatic thermogravimetric system, and combined with the pore size of the absorbent, the mechanism analysis was carried out.Results show that H_(2)O in the carbonation atmosphere can accelerate the reaction rate of the fast reaction stage of carbonation, and improve the pore structure of CaO particle and the conversion rate of carbonation. SO_(2)in the carbonation atmosphere can hinder CO_(2)capture and reduce the conversion rate of carbonation, and the conversion rate decreases more obviously in the cycle process. When H_(2)O and SO_(2)act synergically in the carbonation process, the calcium cycling characteristics may be affected by the synergistic effect of H_(2)O and SO_(2). When H_(2)O volume fraction increases from 0% to 20% with 0.05% volume fraction of SO_(2), the absorbent pore volume gradually increases and CO_(2)capture capacity can be improved.With the addition of 10% volume fraction of H_(2)O, when the volume fraction of SO_(2)increases from 0% to 0.1%, the pore clogging of absorbent becomes more serious and CO_(2)capture capacity decreases. However, the carbonation conversion rate still remain a higher value than that without H_(2)O. Synergistic effect of H_(2)O and SO_(2)mainly reflects in that H_(2)O could weaken the hindering effect of SO_(2)on CO_(2)capture, thereby improving the carbonation conversion rate of absorbent.

关 键 词：CO_(2)捕集 钙循环 H_(2)O SO_(2) 协同效应 孔结构 

分 类 号：TQ424[化学工程] X511[环境科学与工程—环境工程]