化工进展 ›› 2023, Vol. 42 ›› Issue (1): 215-225.DOI: 10.16085/j.issn.1000-6613.2022-0558

• 工业催化 • 上一篇    下一篇

钒钛系脱硝催化剂抗硫酸氢铵中毒改进措施研究进展

刘亮1(), 王朝曦1, 李鑫龙1, 张高山2, 王守阳2, 张林林1, 陆畅1, 卿梦霞1()   

  1. 1.长沙理工大学能源与动力工程学院,湖南 长沙 410114
    2.中国华电集团有限公司湖南分公司,湖南 长沙 410000
  • 收稿日期:2022-04-04 修回日期:2022-07-01 出版日期:2023-01-25 发布日期:2023-02-20
  • 通讯作者: 卿梦霞
  • 作者简介:刘亮(1967—),男,博士,教授,研究方向为煤与生物质高效清洁利用。E-mail:liuliang_hn@126.com
  • 基金资助:
    国家自然科学基金(52106131);湖南省自然科学基金(2022JJ40489)

Research progress on the improvement of vanadium and titanium denitrification catalysts against ammonium bisulfate poisoning

LIU Liang1(), WANG Zhaoxi1, LI Xinlong1, ZHANG Gaoshan2, WANG Shouyang2, ZHANG Linlin1, LU Chang1, QING Mengxia1()   

  1. 1.School of Energy and Power Engineering, Changsha University of Science Technology, Changsha 410114, Hunan, China
    2.China Huadian Group Corporation Hunan Branch, Changsha 410000, Hunan, China
  • Received:2022-04-04 Revised:2022-07-01 Online:2023-01-25 Published:2023-02-20
  • Contact: QING Mengxia

摘要:

NH3选择性催化还原(SCR)技术具有较高的脱硝效率、优良的选择性和实用性,是当前燃煤电厂去除NO x 的主流方法。其中V2O5/TiO2催化剂在中温段(300~450℃)具有较高的脱硝活性和抗硫性,被广泛应用。但是,烟气中的SO3、NH3和水蒸气会发生反应生成硫酸氢铵(ABS)和硫酸铵(AS),其中硫酸氢铵在低温条件下因毛细冷凝现象沉积在V2O5/TiO2催化剂表面致其中毒,活性降低。为了改善低温条件下催化剂中毒问题,本文通过分析ABS在催化剂表面的生成机理、对催化剂的危害及催化剂抗ABS中毒改性研究进展,发现钒钛系脱硝催化剂抗ABS中毒改进措施主要集中在抑制硫酸氢铵生成、促进硫酸氢铵分解两方面。最后,总结了合理调控催化剂壁厚、孔径和隔离层等物理结构以及添加MoO3、BaO、Nb2O5、Fe2O3、CeO2、SiO2等助剂对低温条件下SCR脱硝催化剂抗ABS中毒性能的促进作用,为未来提高低温条件下SCR脱硝催化剂抗ABS中毒性能的研究提供了一定的理论指导。

关键词: V2O5/TiO2催化剂, 催化剂载体, 选择性催化还原, SO2氧化, 硫酸氢铵

Abstract:

NH3 selective catalytic reduction (SCR) technology has high denitration efficiency, excellent selectivity and good usefulness. It is thus the mainstream method of NO x removal in coal-fired power plants. V2O5/TiO2 catalyst is widely used due to its high denitration activity and sulfur resistance in the medium temperature range (300—450℃). However, SO3, NH3 and water vapor in the flue gas would produce ammonium bisulfate (ABS) and ammonium sulfate (AS). Due to the capillary condensation at low temperature, ABS would deposit on the surface of V2O5/TiO2 catalyst and the activity will be reduced. In order to avoid the catalyst poisoning at low temperature, we analyzed the formation mechanism of ABS on the catalyst surface, the harm to the catalyst and the research progress of anti ABS poisoning by catalyst modification, and found that the improvement measures mainly focus on inhibiting the ABS formation and promoting its decomposition. Finally, the promotion of the anti ABS poisoning performance of SCR denitration catalyst at low temperature by reasonably adjusting the catalyst's physical structure such as wall thickness, pore diameter and isolation layer, and by adding additives such as MoO3, BaO, Nb2O5, Fe2O3, CeO2 and SiO2 were summarized, which could provide some theoretical guidance for the future research in this area.

Key words: V2O5/TiO2 catalyst, catalyst support, selective catalytic reduction, SO2 oxidation, ammonium kisulfate

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