加装SCR脱硝装置对空预器冷端腐蚀的影响解析

doi:10.11930/j.issn.1004-9649.201612097

摘要/Abstract

摘要： 选择性催化还原（SCR）脱硝工艺是燃煤电站应用最为广泛的脱硝方法，由于部分电厂未在脱硝改造的同时对空气预热器（简称空预器）进行防腐改造，脱硝系统在运行一段时间之后，出现了空预器冷端元件腐蚀的问题。基于2×300MW机组典型案例，分析了加装SCR脱硝装置后空预器冷端腐蚀的成因，指出了催化剂活性降低是直接原因，并从运行管理角度提出了防范措施及治理建议。

关键词: 火电机组, 空气预热器, 冷端元件, 腐蚀, 硫酸氢铵, 催化剂活性

Abstract: Selective catalytic reduction technology is most widely used in the coal-fired power plant. Since some power plants have not retrofitted the air preheater in the process of denitration transformation, corrosion of the cold end components within the air preheater happens after a certain period of operation of the denitrification system. A 2×300 MW unit is taken as a case for this study to analyze the causes of the corrosion of the cold end components within the air preheater after the installation of the SCR denitrification. It concludes that the direct cause is the catalyst activity reduction some preventive measures and treatment suggestions are proposed from the operation management perspective.

Key words: thermal power unit, air preheater, cold end element, corrosion, ammonium bisulfate (NH₄HSO₄), catalyst activity

中图分类号:

李超. 加装SCR脱硝装置对空预器冷端腐蚀的影响解析[J]. 中国电力, 2018, 51(5): 47-51.

LI Chao. Analysis of the Influence of the Added SCR Denitrification Unit on Cold End Corrosion of the Air Preheater[J]. Electric Power, 2018, 51(5): 47-51.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.201612097

https://www.electricpower.com.cn/CN/Y2018/V51/I5/47

参考文献

[1] 孙克勤, 钟秦, 黄丽娜, 等. OI2-SCR烟气脱硝技术在改造工程中的应用[J]. 中国电力, 2007, 40(2):67-70.SUN Keqin, ZHONG Qin, HUANG Lina, et al. Application of OI2-SCR flue gas denitrification technology in the retrofit project[J]. Electric Power, 2007, 40(2):67-70.
[2] 沈艳梅, 魏书洲, 崔智勇. 造成SCR脱硝催化剂失活的关键物质及预防[J]. 中国电力, 2016, 49(4):1-5.SHEN Yanmei, WEI Shuzhou, CUI Zhiyong. The key substances causing SCR denitration catalyst deactivation and the preventive measures[J]. Electric Power, 2016, 49(4):1-5.
[3] 朱林, 吴碧君, 段玖祥, 等. SCR烟气脱硝催化剂生产与应用现状[J]. 中国电力, 2009, 42(8):61-64.ZHU Lin, WU Bijun, DUAN Jiuxiang, et al. Situation of production and application on selective catalytic reduction flue gas de-NO_x catalysts[J]. Electric Power, 2009, 42(8):61-64.
[4] 李超, 于丽新, 韩钟国, 等. 200 MW燃煤机组SCR脱硝改造关键技术问题解析[J]. 环境科学与技术, 2012, 35(12):298-301.LI Chao, YU Lixin, HAN Zhongguo, et al. The key technical issues resolution for 200 MW coal-fired units SCR De NOx transformation[J]. Environmental Science & Technology, 2012, 35(12):298-301.
[5] 曹志勇, 谭城军, 李建中, 等.燃煤锅炉SCR烟气脱硝系统喷氨优化调整试验[J]. 中国电力, 2011, 44(11):55-58.CAO Zhiyong, TAN Chengjun, LI Jianzhong, et al. Experiment of optimization adjustment for ammonia injection of selective catalytic reduction flue gas denitration system in coal-fired boiler[J]. Electric Power, 2011, 44(11):55-58.
[6] 惠润堂, 庄柯, 韦飞, 等.加装SCR脱硝装置对燃煤锅炉系统的影响及对策[J]. 环境工程, 2013, 31(6):82-85.HUI Runtang, ZHUANG Ke, WEI Fei, et al. The influence and countermeasure of SCR denitration device on boiler system of coal-fired power plant[J]. Environmental Engineering, 2013, 31(6):82-85.
[7] 方立军, 杨雪, 刘玉东, 等. SCR烟气脱硝空气预热器堵灰NH₄HSO₄含量实验研究[J]. 电力科学与工程, 2017, 33(1):37-42.FANG Lijun, YANG Xue, LIU Yudong, et al. Experimental Study on NH₄HSO₄ Content in the air preheater of SCR flue gas denitrification[J]. Electric Power Science and Engineering, 2017, 33(1):37-42.
[8] 梁川, 沈越. 1000 MW机组SCR烟气脱硝系统优化运行[J]. 中国电力, 2012, 45(1):41-44.LIANG Chuan, SHEN Yue. Optimal operation of selective catalytic reduction (SCR) flue gas denitrification system in 1000 MW unit[J]. Electric Power, 2012, 45(1):41-44.
[9] 于洪海, 陈利, 曲立涛. SCR催化剂活性降低对空预器腐蚀的影响分析[J]. 环境科学导刊, 2016, 35(5):6-8.YU Honghai, CHEN Li, QU Litao. Analysis on the SCR catalyst activity reducing the effects of corrosion to the air preheater[J]. Environmental Science Survey, 2016, 35(5):6-8.
[10] 马双忱, 金鑫, 孙云雪, 等.SCR烟气脱硝过程硫酸氢铵的生成机理与控制[J]. 热力发电, 2010, 39(8):12-17.MA Shuangchen, JIN Xin, SUN Yunxue, et al. The formation mechanism of ammonium bisulfate in SCR flue gas denitrification process and control thereof[J]. Thermal Power Generation, 2010, 39(8):12-17.
[11] 王乐乐, 孔凡海, 何金亮, 等. 超低排放形势下SCR脱硝系统运行存在问题与对策[J]. 热力发电, 2016, 45(12):19-24.WANG Lele, KONG Fanhai, HE Jinliang, et al. Difficulties and countermeasures of SCR denitration system operation in ultra low emission situation[J]. Thermal Power Generation, 2016, 45(12):19-24.
[12] 刘健. 火电厂脱硝系统催化剂故障分析及解决对策[J]. 华北电力技术, 2012(11):38-39.LIU Jian. Failure Analysis and Countermeasures of denitration system in thermal power plant[J]. North China Electric Power, 2012(11):38-39.
[13] 何金亮, 金理鹏, 卢承政, 等. 燃煤电站SCR烟气脱硝系统运行典型故障诊断[J]. 中国电力, 2016, 49(8):148-153.HE Jinliang, JIN Lipeng, LU Chengzheng, et al. Diagnosis of typical operation faults of SCR flue gas denitrification system in coal-fired power plants[J]. Electric Power, 2016, 49(8):148-153.
[14] 姜烨, 高翔, 吴卫红, 等.选择性催化还原脱硝催化剂失活研究综述[J]. 中国电机工程学报, 2013, 33(14):18-31.JIANG Ye, GAO Xiang, WU Weihong, et al. Review of the deactivation of selective catalytic reduction De NO_x catalysts[J]. Proceedings of the CSEE, 2013, 33(14):18-31.
[15] BARTHOLOMEW C H. Mechanisms of catalyst deactivation[J]. Applied Catalysis A:General, 2001, 212(1/2):17-60.
[16] 刘红辉, 刘伟, 黄锐, 等.燃煤电厂SCR脱硝催化剂失活及其再生性能研究[J]. 中国电力, 2014, 47(4):139-143.LIU Honghui, LIU Wei, HUANG Rui, et al. Study on performance of deactivated and regenerated catalysts for coal-fired power plant SCR denitration[J]. Electric Power, 2014, 47(4):139-143.
[17] NISCHT W, HINES J, ROBINSON K. Update of selective catalytic reduction retrofit on a 675 MW boiler at AES somerset[C]//ASME International Joint Power Generation Conference. Miami:ASME, 2000.
[18] CLAY E, ROBERT L, NTHONY L. What's new in SCRs[C]//Environmental Control Conference. USA:DOE, 2006.
[19] JAMES E, TONY E, WILLIAM H, et al. The impact of arsenic on coal fired power plants equipped with SCR[C]//ICAC 2002 forum, Operating experience for reducing NO_x emissions. 2002.