Diagnosis and Countermeasures of SCR Denitration Catalyst Abrasion in Coal-fired Power Plants

doi:10.11930/j.issn.1004-9649.201610116

Abstract

Abstract: In order to solve the increasingly prominent issue of gas denitration catalyst system abrasion in coal-fired power plants, the mechanism as well as the causes and the damages of the catalyst abrasion are analyzed. The diagnostic idea and strategies are also summarized. Then detailed solution procedures are introduced by taking the example of the catalyst abrasion treatment for a 300 MW unit. Firstly, the distribution statistics of the abrasion was compiled. While sufficient mechanical resistances of the catalyst elements was confirmed, the steam sootblower was verified to cause no blowing loss of catalyst. Secondly, CFD numerical simulation was employed to investigate the flow fields inside both the honeycomb pores and the reactor. The root cause of abrasion was revealed as the extraordinarily high velocity and deviation of injection angle of gas flow at some parts of the upper layer. Afterwards the flow field design was optimized. Since the implementation of optimized plan, the catalyst abrasion has been effectively improved by eliminating the parts with high velocity and adjusting the injection angle of gas flow. The diagnosis strategy to the catalyst abrasion in this investigation is of great significance to solve the practical problem of the power plants.

Key words: coal-fired power plants, SCR de-NO_x catalyst, abrasion mechanism, flow field, flue gas velocity, flue gas denitration

CLC Number:

X705
TM621.9

LEI Siyuan, KONG Fanhai, WANG Lele, YANG Xiaoning, DU Changfei. Diagnosis and Countermeasures of SCR Denitration Catalyst Abrasion in Coal-fired Power Plants[J]. Electric Power, 2018, 51(1): 158-163.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201610116

https://www.electricpower.com.cn/EN/Y2018/V51/I1/158

References

[1] 张强. 燃煤电站SCR烟气脱硝技术及工程应用[M]. 北京:化学工业出版社,2007.
[2] NAKAJIMA F, HAMADA I. The state-of-the-art technology of NO_x control[J]. Catalysis Today, 1996, 29(1-4):109-115.
[3] 陈进生. 火电厂烟气脱硝技术——选择性催化还原法[M]. 北京:中国电力出版社,2008:51-54.
[4] FORZATTI P. Present status and perspectives in de-NO_x SCR catalysis[J]. Applied Catalysis A:General, 2001, 222(1-2):221-236.
[5] 冯前伟,张杨,王丰吉,等. 现役燃煤机组SCR烟气脱硝装置运行现状分析[J]. 中国电力,2017,50(4):157-161. FENG Qianwei, ZHANG Yang, WANG Fengji. et al. Analysis on operating status of SCR facilities in active coal-fired units[J].Electric Power, 2017, 50(4):157-161.
[6] 鲁佳易,卢啸风,刘汉周,等. SCR法烟气脱硝催化剂及其应用特性的探讨[J]. 电站系统工程,2008,24(1):5-8. LU Jiayi, LU Xiaofeng, LIU Hanzhou, et al. The recent application of de-NO_x SCR catalysts[J]. Power System Engineering, 2008, 24(1):5-8.
[7] 孙艺心,韩强. SCR脱硝系统催化剂防磨措施的探讨[J]. 锅炉制造,2013(4):39-40. SUN Yixin, HAN Qiang. Discussion of SCR de-NO_x catalyst abrasion proof measures[J]. Boiler Manufacturing, 2013(4):39-40.
[8] 何文深,陈建军,郑佐东. SCR蜂窝式脱硝催化剂抗磨损性能研究[J]. 电力科技与环保,2011,27(5):10-12. HE Wenshen, CHEN Jianjun, ZHENG Zuodong. Study of abrasion performance of SCR honeycomb catalysts[J]. Electric Power Environmental Protection, 2011, 27(5):10-12.
[9] 李俊华,杨恂,常化振. 烟气催化脱硝关键技术研发及应用[M]. 北京:科学出版社,2015.
[10] 杨泽伦. SCR烟气脱硝工程设计原则和关键设计技术[J]. 中国电力,2015,48(4):27-31. YANG Zelun. Principles and key techniques for SCR De-NO_x engineering design[J]. Electric Power, 2015, 48(4):27-31.
[11] 肖雨亭,徐莉,贾曼,等. 蜂窝式脱硝催化剂在烟气中磨损行为的模拟研究[J]. 中国电力,2012,45,(12):96-98. XIAO Yuting, XU Li, JIA Man, et al. Research on abrasion simulation of de-NO_x honeycomb catalysts in flue gas[J]. Electric Power, 2012, 45(12):96-98.
[12] 李锋,於承志,张朋,等. 高尘烟气脱硝催化剂耐磨性能研究[J]. 热力发电,2010,39(12):73-75. LI Feng, YU Chengzhi, ZHANG Peng, et al. Study on abrasieveness of catalyst used for denitrification in flue gas with high dust content[J]. Thermal Power Generation, 2010, 39(12):73-75.
[13] 邓静杰,韦红旗,仲亚飞. 670 MW机组SCR脱硝催化剂磨损的研究分析[J]. 电站系统工程,2015,31(4):58-60. DENG Jingjie, WEI Hongqi, ZHONG Yafei. Analysis on abrasion of catalyst in SCR denitrification device of 670 MW power unit[J]. Power System Engineering, 2015, 31(4):58-60.
[14] WILHITE DAVID C. The use of computational fluid dynamics in selective reduction system ductwork design[C]//Proceedings of the ASME Fluids Engineering Division, New York, 1998:247-248.
[15] XU Yuanyuan, ZHANG Yan, LIU Fengna, et al. CFD analysis on the catalyst layer breakage failure of an SCR de-NO_x system for a 350 MW coal-fired power plant[J]. Computers & Chemical Engineering, 2014, 69(3):119-127.