Difficulties and countermeasures of SCR denitration system operation in ultra low emission situation

WANG Lele; KONG Fanhai; HE Jinliang; FANG Zhaojun; YANG Xun; LEI Siyuan; YAO Yan; YANG Xiaoning

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Difficulties and countermeasures of SCR denitration system operation in ultra low emission situation

更新时间：2025-09-28

- Difficulties and countermeasures of SCR denitration system operation in ultra low emission situation
- Thermal Power Generation Vol. 45, Issue 12, Pages: 19-24(2016)
- 作者机构：
  
  西安热工研究院有限公司苏州分公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： X773
- Published：2016
- 稿件说明：
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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.
DOI：

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. DOI：

摘要

针对超低排放形势下选择性催化还原(SCR)脱硝系统运行过程中出现的NO_x排放超限、空气预热器硫酸氢铵堵塞加重等问题

分析其主要与超低排放对SCR反应器中NH3/NO_x分布的均匀性要求提高

SO_2/SO_3转化率升高

喷氨优化控制要求提高

最低喷氨温度升高及催化剂寿命管理更加复杂等有关。对此

提出了通过喷氨优化调整和流场优化改造改善NH3/NO_x分布均匀性

减少催化剂的用量及钒含量控制SO_2/SO_3转化率

降低脱硝系统入口喷氨量、SO_3质量浓度或设备改造来拓宽低负荷脱硝运行范围

通过喷氨控制系统优化降低NO_x排放超标及过量喷氨的风险

采取有效的催化剂寿命管理延长催化剂使用寿命、降低废催化剂产生量等解决方案。对实现燃煤电厂SCR脱硝系统的安全、高效及经济运行具有指导意义。

Abstract

Against the frequent NO_xemission overrunning and increasingly air preheater ammonium bisulfate(ABS)blocking in the ultra low emission situation

reason analysis was carried out and the reasons are considered as the followings

the improved requirement of the NH3/NO_xmixing uniformity

the increased SO_2 to SO_3oxidation rate

the higher requirement of denitration control system

the improved minimum ammonia injection temperature and more difficulty with management catalyst life

and so on.To solve these problems

several countermeasures were put forward

such as adjusting the ammonia injection grid to improve the distribution uniformity of NH3/NO_x

reducing the amount of catalyst and vanadium proportion to control the SO_2/SO_3 oxidation rate

decreasing the ammonia injection quantity

SO_3 concentration or by equipment modifications to broaden the scope of low load operation

performing ammonia injection control system optimization to reduce the NO_xemission overrunning and the risk of excessive spraying ammonia

prolonging the service life of the catalyst and reducing the amount of spent catalyst through effective catalyst management.All of these can provide guidance for realizing safety

economic and efficient operation of the SCR equipment in coal-fired power plants.

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