石油学报(石油加工) ›› 2020, Vol. 36 ›› Issue (6): 1389-1397.doi: 10.3969/j.issn.1001-8719.2020.06.030

• 其他 • 上一篇    下一篇

惰性载体支撑钙铜复合吸收剂的碳酸化性能及其动力学分析

张振民1,陈健2,王研凯1,连世文1,李丰泉1,王超1,袁东辉1,李迎春1,段伦博2   

  1. 1. 内蒙古电力(集团)有限责任公司 内蒙古电力科学研究院分公司, 内蒙古 呼和浩特 010020;
    2. 东南大学 能源热转换及基过程测控教育部重点实验室,江苏 南京 210096
  • 收稿日期:2020-06-29 修回日期:2020-08-13 出版日期:2020-11-25 发布日期:2020-12-02
  • 通讯作者: 段伦博,男,教授,博士,从事洁净煤技术,CO2捕集与利用,固废处理等研究工作,E-mail:duanlunbo@seu.edu.cn E-mail:duanlunbo@seu.edu.cn
  • 作者简介:第一作者:张振民,男,高级工程师,硕士,从事循环液化床锅炉灵活性调峰技术,锅炉清洁燃烧技术研究工作,E-mail:asbzhangzhenmin@126.com
  • 基金资助:

    国家重点研发计划项目(2018YFB0605301)基金资助

Analysis of Carbonation and Kinetic Performance of Inert Support-Stabilized CaO/CuO Composites

ZHANG Zhenmin1, CHEN Jian2, WANG Yankai1, LIAN Shiwen1, LI Fengquan1, WANG Chao1, YUAN Donghui1, LI Yingchun1, DUAN Lunbo2   

  1. 1. Inner Mongolia Electric Power Research Institute Branch, Inner Mongolia Electric Power (Group) Co. Ltd., Huhhot 010020, China;
    2. Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, Southeast University, Nanjing 210096, China 
  • Received:2020-06-29 Revised:2020-08-13 Online:2020-11-25 Published:2020-12-02
  • Supported by:
     

摘要:

采用Pechini法分别制备了无惰性载体支撑和惰性载体(Al2O3或者ZrO2)支撑的钙铜复合吸收剂。借助热重分析仪研究了反应温度、载体种类对其氧化性能和CO2捕集性能的影响,并借助扫描电子显微镜(SEM)和氮吸附分析其微观结构。最后,利用缩核模型对惰性载体支撑和无惰性载体支撑的钙铜复合吸收剂的碳酸化反应中的动力学控制阶段开展了动力学分析。结果表明:惰性载体可以显著提升钙铜复合吸收剂的CO2捕集性能,相比于无惰性载体支撑的钙铜复合吸收剂,Al2O3和ZrO2支撑的钙铜复合吸收剂经历10次循环后,CO2捕集量分别提升了100%和71%;添加惰性载体会降低钙铜复合吸收剂的载氧量,但并不影响其循环稳定性。随着碳酸化温度的升高,钙铜复合吸收剂的碳酸化速率和最终CO2捕集量均显著增加。动力学结果表明,添加惰性载体不仅可以加快碳酸化反应动力学控制阶段的反应速率,延缓动力学控制阶段反应速率的衰减,同时还可以降低碳酸化反应活化能,进而对碳酸化反应起到显著的促进作用。

关键词: CO2捕集, 钙循环, 化学链燃烧, 复合材料, 载体, 动力学

Abstract:

Unstabilized and inert support (i.e. Al2O3 or ZrO2) stabilized CaO/CuO composites were synthesized by the Pechini method, respectively. The effects of reaction temperatures and types of inert support on their oxidation and CO2 capture performance were investigated via the thermogravimetric analyzer (TGA). The morphologies and microstructures were characterized by the scanning electron microscopy (SEM) and N2 physisorption measurements. Finally, a shrinking core model was employed to describe the kinetically-controlled stage of the carbonation process for Al2O3 stabilized and unstabilized CaO/CuO composites, respectively. The results show that the incorporation of inert support significantly enhances the CO2 capture performance by 100% and 71% for Al2O3 and ZrO2 stabilized CaO/CuO composites, respectively, after 10 repeated cycles. Although the incorporation of inert support decreases O.2 carrying capacities, negligible effects have been found for the cyclic stability. Carbonation temperatures show an important role in the CO2 capture performance: with the increase in carbonation temperatures, the carbonation rate and final CO2 uptake increased simultaneously. The kinetic studies show that the incorporation of inert support enhances the reaction rate of the kineticscontrolled stage slows down the decline in reaction rate, and lower the activation energies. Overall, the inert support-stabilized CaO/CuO composites exhibit better CO2 capture performance.

Key words: CO2 capture, calcium looping, chemical looping combustion, composite material, stabilizer, kinetics

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