中国电力 ›› 2016, Vol. 49 ›› Issue (2): 164-169.DOI: 10.11930/j.issn.1004-9649.2016.02.164.06

• 节能与环保 • 上一篇    下一篇

SNCR+SCR烟气联合脱硝工艺在电站锅炉中的应用

朱晨曦1,郑迎九1,周昊2   

  1. 1.杭州华电半山发电有限公司,浙江 杭州 310015;
    2.浙江大学 热能工程研究所,浙江 杭州 310027
  • 收稿日期:2015-04-17 修回日期:2016-03-21 出版日期:2016-02-18 发布日期:2016-03-21
  • 作者简介:朱晨曦(1966-),男,江苏南通人,高级工程师,从事电站锅炉脱硫脱硝除灰技术管理工作。E-mail: zhucx1966@126.com

The Application of SNCR+SCR United Flue Gas Denitration Technique in Power Generation Boilers

ZHU Chenxi1, ZHENG Yingjiu1, ZHOU Hao2   

  1. 1. Hangzhou Huadian Banshan Power Generation Co., Ltd., Hangzhou 310015, China;
    2. Institute for Thermal Power Engineering of Zhejiang University, Hangzhou 310027, China
  • Received:2015-04-17 Revised:2016-03-21 Online:2016-02-18 Published:2016-03-21

摘要: 简述了选择性非催化还原(SNCR)+选择性催化还原(SCR)烟气联合脱硝技术原理,针对某电厂5号机组(装机容量130 MW)氮氧化物(NOx)排放超标问题,通过CFD数值模拟,制定了SNCR+SCR烟气联合脱硝工艺。首先采用低氮燃烧技术,将锅炉NOx排放控制在350 mg/m3以下,并且保证SNCR区域较低CO浓度;其次采用SNCR技术,将SCR脱硝装置前NOx质量浓度控制在200 mg/m3以下;最后采用SCR技术,将锅炉出口烟气NOx质量浓度控制在90 mg/m3以下,实现了重点地区NOx达标排放。

关键词: 火电厂, 烟气脱硝, SNCR, SCR, CFD, 流场, 脱硝效率, 氨逃逸

Abstract: Regarding the NOx emission over national standard in Unit 5 of(130 MW) a power plant, this article briefly introduces the fundamentals of SNCR+SCR united flue gas denitration technique and establishes the corresponding implementation procedures through CFD numerical simulation. Firstly, the low-nitrogen combustion technique is utilized to control the boiler NOx emissions under 350 mg/m3 and guarantee low CO concentration in the SNCR zone. Secondly, the SNCR technique is adopted to control the NOx concentration before SCR under 200 mg/m3. At last the SCR technique is adopted to control the NOx emission concentration under 90 mg/m3. In this way, the NOx emissions can meet the related standards in major regions.

Key words: SNCR, SCR, CFD, flow field, denitration efficiency, ammonia escape

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