华电技术 ›› 2019, Vol. 41 ›› Issue (2): 69-72.

• 节能与环保 • 上一篇    下一篇

600MW超临界机组锅炉省煤器分级优化改造

  

  1. 广州发展电力集团有限公司,广州〓510623
  • 出版日期:2019-02-25 发布日期:2019-03-13

Classification and optimizing retrofit of economizer for 600MW supercritical boilers

  1. Guangzhou Development Group Incorporated,Guangzhou 510623, China
  • Online:2019-02-25 Published:2019-03-13

摘要:

为解决燃煤电厂低负荷工况下选择性催化还原(SCR)脱硝装置入口烟温偏低,SCR装置无法正常投运的问题,提出了省煤器上下分级的改造方案。该改造方案既能有效提高SCR脱硝装置入口烟温,满足SCR脱硝装置投运要求,又不影响锅炉效率和排烟温度;同时,新增的一级省煤器采用H型鳍片管能解决SCR脱硝装置出口空间紧凑问题。改造后,通过优化锅炉本体吹灰方式,可避免长时间低负荷工况下SCR脱硝装置入口烟温偏低,以及急升负荷时SCR脱硝装置入口烟温偏高。最后给出了不同类型机组进行省煤器分级布置设计时需考虑的问题。

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Abstract:

Low inlet flue gas temperature of selective catalytic reduction (SCR) denitrification system under low load condition cannot meet the requirement for the operation of SCR devices. An upanddown classification retrofit for economizer is proposed. The plan can effectively increase the inlet temperature of the SCR denitrification device and meet the requirements of SCR operation without affecting the boiler efficiency and exhaust temperature. The new added primary economizer adopts H finned tube to solve the compact space at SCR exit . After the retrofit, the optimized soot blowing method for boiler can avoid the low flue gas temperature at the SCR exit under the longtime and low load condition, and avoid high flue gas temperature at the SCR exit under rising load condition. Finally, the problems that need to be considered in economizers classifying layout for different types of units are given.

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