Application of economizer bypass on selective catalytic reduction system

DONG Chen; WANG Xiaobing; NIU Guoping

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Application of economizer bypass on selective catalytic reduction system

Thermal Power Generation Vol. 43, Issue 3, Pages: 96-100(2014)

更新时间：2025-09-28

- Application of economizer bypass on selective catalytic reduction system
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： X701
- Published：2014
- 稿件说明：
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DONG Chen, WANG Xiaobing, NIU Guoping. Application of economizer bypass on selective catalytic reduction system[J]. Thermal Power Generation, 2014, 43(3): 96-100.
DOI：

DONG Chen, WANG Xiaobing, NIU Guoping. Application of economizer bypass on selective catalytic reduction system[J]. Thermal Power Generation, 2014, 43(3): 96-100. DOI：

摘要

由于机组低负荷运行时

选择性催化还原(SCR)烟气脱硝系统的入口烟气温度低于最低喷氨温度

会导致SCR系统无法喷氨运行。为此

需设置省煤器烟气旁路。以某火电厂600MW机组SCR系统为例

通过数值模拟的方法得到最佳省煤器烟气旁路方案

即将省煤器旁路入口设于喷氨格栅前

将部分接口伸入进口烟道内

加深高温烟气进入SCR系统水平烟道的射入距离

有利于高温烟气和低温烟气迅速混合。该方案实施后

第1层催化剂入口截面上烟气平均温度为319℃

烟气温度分布的最大偏差为2.4%

满足最低喷氨温度要求。

Abstract

To protect catalyst from ammonium sulfate/bisulfate deposition and subsequent poisoning

the minimum operation temperature at low load should not be violated.Therefore

the selective catalytic reduction(SCR)system should be down at low load.However

the exit NOxconcentration may not meet the emission standards.The application of economizer bypass is an effective way to solve this problem.Taking the SCR system of a 600MW coal-fired power plant as the example

the numerical simulation method was employed to obtain the optimum economizer bypass scheme.By using the optimum economizer bypass

the average flue gas temperature at inlet cross section of the first catalytic layer increases to 319℃

which is above the minimum operation temperature

and the maximum deviation of the flue gas temperature distribution in this cross section is 2.4%

which satisfies the minimum ammonia spraying temperature.

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