化工进展 ›› 2021, Vol. 40 ›› Issue (11): 6385-6392.DOI: 10.16085/j.issn.1000-6613.2020-2283

• 资源与环境化工 • 上一篇    下一篇

镁负载CaO基吸附剂捕集CO2性能及抗烧结机理

孙荣岳(), 彭超, 陈宇皇, 朱洪亮   

  1. 南京工程学院能源与动力工程学院,江苏 南京 211167
  • 收稿日期:2020-11-16 修回日期:2021-01-27 出版日期:2021-11-05 发布日期:2021-11-19
  • 通讯作者: 孙荣岳
  • 作者简介:孙荣岳(1986—),男,博士,副教授,研究方向为电厂烟气CO2捕集技术。E-mail: sunrongyue@163.com
  • 基金资助:
    国家自然科学基金(51706094);江苏省大学生创新创业训练项目(202011276061Y)

CO2 capture capacity and anti-sintering mechanism of MgO supported CaO based sorbent

SUN Rongyue(), PENG Chao, CHEN Yuhuang, ZHU Hongliang   

  1. School of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, Jiangsu, China
  • Received:2020-11-16 Revised:2021-01-27 Online:2021-11-05 Published:2021-11-19
  • Contact: SUN Rongyue

摘要:

复合钙基吸附剂制备成本过高是限制其工业化应用的主要瓶颈问题。本文以不可溶的CaCO3和Ca(OH)2作为钙源,通过燃烧合成法制备钙镁复合吸附剂,在双固定床反应器上研究了其循环捕集CO2性能。结果显示:制备得到的钙镁复合吸附剂具有更发达的孔隙结构,吸附剂表面Ca和Mg分散均匀,MgO均匀分布于CaO晶粒之间,有效提高了钙镁复合吸附剂的抗烧结特性,因此钙镁复合吸附剂循环反应过程中具有高捕集CO2活性。以Ca(OH)2作为钙源时,燃烧合成过程中Ca和Mg均匀同时析出,分散更加均匀,有效避免了CaCO3作为钙源时Mg的团聚问题,因此得到的钙镁复合吸附剂循环捕集CO2性能最优。最佳的Ca/Mg摩尔比为(8∶2)~(7.5∶2.5)。本研究以不可溶钙源制备得到高活性钙镁复合吸附剂,有效控制了吸附剂成本,具有更好的工程应用前景。

关键词: CO2捕集, 吸附法, 钙镁复合吸附剂

Abstract:

The costs for the synthesis of calcium based sorbents are quite high, which has severely limited their industrial application. In this article, insoluble CaCO3 and Ca(OH)2 were used as raw materials to synthesize CaO/MgO sorbents by solution combustion. The CO2 capture capacity of the synthesized sorbents was investigated in a double fixed-bed reactor. The results showed that the CaO/MgO sorbents presented highly porous microstructures, with MgO uniformly distributed on the surface of CaO and their anti-sintering performance was improved obviously. Therefore, the CaO/MgO sorbents showed much higher CO2 capture capacities. When Ca(OH)2 was used as calcium precursor, the Ca and Mg crystallized simultaneously during the solution combustion process and distribute more evenly on the obtained sorbent. The optimum Ca/Mg molar ratio range was (8∶2)~(7.5∶2.5). The synthetic cost is effectively controlled by using insoluble calcium precursors as raw materials and hence the produced CaO/MgO sorbent here has a better engineering application prospect.

Key words: CO2 capture, adsorption method, CaO/MgO sorbents

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