石油学报(石油加工) ›› 2020, Vol. 36 ›› Issue (6): 1178-1188.doi: 10.3969/j.issn.1001-8719.2020.06.008

• 化学链燃烧 • 上一篇    下一篇

碱金属掺杂对NiFeAlO4载氧体结构及反应特性的影响

魏泽华, 刘道诚, 王九占, 荆洁颖   

  1. 太原理工大学 煤科学与技术省部共建国家重点实验室培育基地,山西 太原 030024
  • 收稿日期:2020-06-28 修回日期:2020-08-12 出版日期:2020-11-25 发布日期:2020-12-02
  • 通讯作者: 荆洁颖,女,副教授,博士,从事煤基能源资源 催化转化及污染物控制研究,Tel:86-351-6018453,E-mail:jingjieying@tyut.edu.cn E-mail:jingjieying@tyut.edu.cn
  • 作者简介:第一作者:魏泽华,女,硕士研究生,从事化学链燃烧载氧体制备的研究,E-mail:weizehua0406@link.tyut.edu.cn
  • 基金资助:
    国家重点研发计划项目(2018YFB0605401-01)基金资助

Effect of Alkali Metal Doping on NiFeAlO4 Oxygen Carrier Structures and Its Coal Chemical Looping Combustion Performance

 WEI Zehua, LIU Daocheng, WANG Jiuzhan, JING Jieying   

  1.  Training Base of State Key Laboratory of Coal Science and Technology Jointly Constructed by Shanxi Province and Ministry of Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2020-06-28 Revised:2020-08-12 Online:2020-11-25 Published:2020-12-02
  • Supported by:
     

摘要:

采用溶胶-凝胶法和浸渍法制备了碱金属掺杂的尖晶石结构NiFeAlO4载氧体,考察了制备方法、碱金属种类、碱金属掺杂比例对NiFeAlO4载氧体结构、煤化学链燃烧特性和循环稳定性的影响。结果表明,溶胶凝胶法制备的钾掺杂NiFeAlO4载氧体具有更好的反应性,当载氧体与煤质量比为20∶1时,掺杂质量分数为5% K2CO3的NiFeAlO4载氧体与煤反应的碳转化率为99%,高于NiFeAlO4载氧体与煤反应时的碳转化率(87%)。与NiFeAlO4载氧体相比,掺杂质量分数为5% K2CO3的NiFeAlO4载氧体呈现出更好的循环稳定性,主要归因于碱金属K的掺杂改善了载氧体的反应活性,对载氧体的团聚有抑制作用,且反应前后载氧体晶相结构保持不变。

关键词: 化学链燃烧;NiFeAlO4, 碱金属;载氧体;CO2

Abstract:

The alkali metal doped NiFeAlO4 oxygen carrier with spinel structures were prepared via the impregnation and the sol-gel methods. The coal chemical looping combustion reaction and cycling stability of the alkali metal doped NiFeAlO4 oxygen carrier were investigated via considering the factors of preparation methods, the alkali metal type and the alkali metal doping dosage. Results show that potassium doped NiFeAlO4 oxygen carrier synthesized by the sol-gel method possesses superior reactivity. When the mass ratio between oxygen carrier and coal is 20∶1, 99% carbon conversion has been obtained over NiFeAlO4 oxygen carrier doped with 5% (mass fraction) K2CO3, which is much higher than that of the NiFeAlO4 oxygen carrier reacting with coal (87%)。Compared with NiFeAlO4 oxygen carrier, NiFeAlO4 oxygen carrier doped with 5% (mass fraction) K2CO3 exhibited better cyclic stability. The analysis of crystal structures and morphology of NiFeAlO4 oxygen carrier doped with 5% (mass fraction) K2CO3 shows that the grain agglomeration is inhibited by potassium and crystal structures remain unchanged before and after reactions.

Key words: chemical looping combustion; NiFeAlO4 , alkali metal, oxygen carrier, carbon dioxide

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