某燃煤电厂SCR脱硝装置堵塞问题分析及改进
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摘要
结合某电厂300 MW机组脱硝装置运行实例,分析脱硝装置运行过程中整流装置、喷氨格栅、催化剂以及空气预热器等设备堵塞问题及其成因,并提出优化大灰滤网结构和布置、实行定期运行蒸汽吹灰器,调整声波吹灰器工作频次、及时清理选择性催化还原(SCR)脱硝装置各层及钢梁、导流板积灰、确保催化剂通道畅通以及更换积灰严重的催化剂等相应的优化改进措施,以提高SCR脱硝装置运行安全稳定性。可为防控和应对燃煤电厂SCR脱硝装置积灰提供参考。
Combining with the practical operation of a denitrification device in a 300 MW unit,blockage in rectifying device,ammonia injection grid,catalyst and air preheater during the running of denitrification device and the corresponding causes are analyzed.It is proposed to optimize the structure and arrangement of the large ash filter,run steam soot blower regularly,adjust the frequency of the sonic soot blower,timely clean up the ash accumulated on steel beams and the deflectors on different layers of the selective catalytic reduction(SCR) denitration device,ensure the flow channels of catalyst and replace catalysts with severe ash deposit.These optimization measures can improve the security and stability of the SCR denitrification devices,which provides reference for prevention and control of the accumulation of ash in SCR denitrification devices of coal-fired power plants.
Combining with the practical operation of a denitrification device in a 300 MW unit,blockage in rectifying device,ammonia injection grid,catalyst and air preheater during the running of denitrification device and the corresponding causes are analyzed.It is proposed to optimize the structure and arrangement of the large ash filter,run steam soot blower regularly,adjust the frequency of the sonic soot blower,timely clean up the ash accumulated on steel beams and the deflectors on different layers of the selective catalytic reduction(SCR) denitration device,ensure the flow channels of catalyst and replace catalysts with severe ash deposit.These optimization measures can improve the security and stability of the SCR denitrification devices,which provides reference for prevention and control of the accumulation of ash in SCR denitrification devices of coal-fired power plants.
引文
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[3]汪洋,胡永锋.燃煤电站SCR脱硝系统预防大颗粒灰堵塞方法[J].环电力科技与环保,2012,28(2):17-19.
[4]柏源,薛建明,唐仲恺.燃煤电厂脱硝设施性能诊断及策略研究[J].环电力科技与环保,2018,34(3):30-32.
[5]陈鸿伟,罗敏,王远鑫,等.燃煤锅炉飞灰对SCR脱硝催化剂的影响及预防措施[J].燃烧科学与技术,2017,23(3):200-211.
[6]邵媛,张海燕,李乐丰,等.火电厂SCR脱硝系统运行中存在的问题及解决措施[J].山东电力技术,2015,42(1):72-74,80.
[7]胡永锋,梁新磊.燃煤电厂SCR法烟气脱硝装置常见问题及原因分析[J].华电技术,2015,37(11):62-63,75.
[8]张杨,冯前伟,裴煜坤,等.燃煤电厂SCR烟气脱硝装置运维技术分析[J].环电力科技与环保,2016,32(5):32-34.
[9]邓全胜,孙法治.脱硝SCR反应器堵灰原因分析[J].东北电力技术,2017,38(4):57-60.
[10]徐劲,陈鸿伟,赵超,等.脱硝系统催化剂模块磨损及堆灰模拟改造[J].区域供热,2016(6):22-29.
[11]王海刚.SCR脱硝机组空气预热器堵塞治理建议[J].环境工程,2016(2):96-101.