中国电力 ›› 2015, Vol. 48 ›› Issue (4): 36-39.DOI: 10.11930.2015.4.36

• 火电厂烟气脱硝技术专栏 • 上一篇    下一篇

提高SCR反应器入口烟气温度的技术方法

谢尉扬   

  1. 浙江浙能技术研究院,浙江 杭州 310003
  • 收稿日期:2015-01-13 出版日期:2015-04-25 发布日期:2015-12-03
  • 作者简介:谢尉扬(1966—),男,浙江天台人,硕士,高级工程师(教授级),从事电力工程建设和生产技术研究工作。E-mail: xieweiyang@tom.com

Technical Measures to Raise the Inlet Flue Gas Temperature of SCR Reactor

XIE Weiyang   

  1. Zhejiang Energy Group R & D, Hangzhou 310003, China
  • Received:2015-01-13 Online:2015-04-25 Published:2015-12-03

摘要: SCR催化剂的活性受烟气温度影响,当反应器进口烟气温度降低到催化剂最低投运温度时,脱硝系统须退出运行。按照火电厂燃煤锅炉SCR脱硝装置的常规设计,在低负荷运行时经常出现SCR反应器进口烟气温度低于催化剂最低投运温度的情况,导致氮氧化物排放浓度超标。为了保证锅炉日常运行时SCR反应器进口的烟气温度满足催化剂投运条件,介绍了采用高温烟气加热、省煤器分段布置、旁路部分省煤器给水、提高锅炉给水温度等技术方法,并就其特点进行了对比分析。

关键词: 烟气脱硝, 选择性催化还原, 入口烟温, 保证措施

Abstract: The flue gas temperature may have significant impact on the activity of SCR catalyst. The denitrification system will have to be turned off from service when the flue gas temperature falls down below the allowed minimum commissioning temperature of the catalyst. As it is designed in the conventional denitrification systems, it is not uncommon that the SCR inlet flue gas temperature is lower than the minimum catalyst commissioning temperature at low loads, which will cause the NOx emissions higher than the standard limit. In this paper, in order to make the inlet flue gas temperature of SCR reactor meet the catalyst commissioning conditions in boiler routine operation, the technical measures to raise the inlet flue gas temperature are proposed such as heating by high temperature flue gas, economizer partition arrangement, bypassing the economizer on the waterside and raising the feedwater temperature. In addition, the comparative analysis on the characteristics of these measures is also conducted.

Key words: flue gas denitrification, selective catalytic reduction, inlet flue gas temperature, technical measures

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