NH<sub>3</sub>-NO<sub>x</sub> mixture optimization for SCR denitrification system in a coal-fired unit

L Tai; ZHAO Xuekui; WANG Qian

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NH₃-NO_x mixture optimization for SCR denitrification system in a coal-fired unit

Thermal Power Generation Vol. 45, Issue 7, Pages: 13-20(2016)

更新时间：2025-09-28

- NH₃-NO_x mixture optimization for SCR denitrification system in a coal-fired unit
- 作者机构：
  
  1. 东北电力大学能源与动力工程学院
  2. 江西省电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC： X773
- Published：2016
- 稿件说明：
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L Tai, ZHAO Xuekui, WANG Qian. NH₃-NO_x mixture optimization for SCR denitrification system in a coal-fired unit[J]. Thermal Power Generation, 2016, 45(7): 13-20.
DOI：

L Tai, ZHAO Xuekui, WANG Qian. NH₃-NO_x mixture optimization for SCR denitrification system in a coal-fired unit[J]. Thermal Power Generation, 2016, 45(7): 13-20. DOI：

摘要

以某电厂660 MW燃煤机组选择性催化还原(SCR)脱硝系统为研究对象

针对氨逃逸严重、空气预热器(空预器)运行短时间堵塞的问题

结合物理模型速度场冷态试验及现场NO_x浓度分布测试试验

建立了该脱硝系统的三维模型

并运用Fluent软件模拟了不同圆盘导流板安装角度及不同喷氨方案下该SCR脱硝系统烟气流场和组分分布。结果表明

适当调大圆盘导流板倾角及各喷口喷氨速度

可有效改善催化剂层入口处NH_3浓度和氨氮摩尔比分布的均匀性

使催化剂层入口处氨氮摩尔比相对标准偏差控制在4%以下

满足设计和运行要求

为大型燃煤机组SCR脱硝系统的优化调整和运行提供理论参考。

Abstract

Taking the SCR denitrification system of a 660 MW coal-fired unit as the object

to solve such problems as large amount of ammonia escape and air-preheater blockage within short operation time

a three dimensional model for this denitration system was established

combining with the results of velocity field cold test in physical model and local NO_xconcentration distribution test.Moreover

numerical simulation of flow field and components field with different disc deflector installation angles and variant ammonia injection schemes was performed by using Fluent fluid calculation software.The results show that

increasing the disc deflector angle properly and adjusting the parameters of each ammonia injection entrance distinguishingly and rationally can improve the distribution situation of NH_3 concentration and the molar ratio of NH_3 to NO_xat the catalyst layer inlet

the standard relative deviation of molar ratio of NH_3 to NO_xcan be controlled within 4%

which satisfies the design and operation requirements well.The optimal solutions can provide a theoretical reference to optimization of SCR denitrification system and operation of large-scale coal-fired units.

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NH3-NOx mixture optimization for SCR denitrification system in a coal-fired unit

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摘要

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NH₃-NO_x mixture optimization for SCR denitrification system in a coal-fired unit