选择性催化还原烟气脱硝系统速度场及组分分布对脱硝效率的影响

赵大周; 王传奇; 司风琪; 徐治皋

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选择性催化还原烟气脱硝系统速度场及组分分布对脱硝效率的影响

热力发电 2016年45卷第2期页码：29-33

热能科学研究 | 更新时间：2025-09-28

- 选择性催化还原烟气脱硝系统速度场及组分分布对脱硝效率的影响
- Influence of inlet velocity field and component concentration distribution on de-NO_x efficiency of SCR denitration systems
- 作者机构：
  
  1. 东南大学能源热转换及其过程测控教育部重点实验室
  2. 华电电力科学研究院
  3. 大唐马鞍山当涂发电有限公司
- 作者简介：
- 基金信息：
- DOI：
  中图分类号： X773
- 纸质出版：2016
- 稿件说明：
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赵大周, 王传奇, 司风琪, 等. 选择性催化还原烟气脱硝系统速度场及组分分布对脱硝效率的影响[J]. 热力发电, 2016,45(2):29-33.

ZHAO Dazhou, WANG Chuanqi, SI Fengqi, et al. Influence of inlet velocity field and component concentration distribution on de-NO_x efficiency of SCR denitration systems[J]. Thermal Power Generation, 2016, 45(2): 29-33.
赵大周, 王传奇, 司风琪, 等. 选择性催化还原烟气脱硝系统速度场及组分分布对脱硝效率的影响[J]. 热力发电, 2016,45(2):29-33. DOI：

ZHAO Dazhou, WANG Chuanqi, SI Fengqi, et al. Influence of inlet velocity field and component concentration distribution on de-NO_x efficiency of SCR denitration systems[J]. Thermal Power Generation, 2016, 45(2): 29-33. DOI：

摘要

为了获得较高的选择性催化还原(SCR)反应器内脱硝效率

通过Fluent软件耦合SCR详细反应机理的方法建立了脱硝反应三维数值模型

研究了脱硝反应入口烟气速度及氨氮摩尔比分布不均对脱硝效率和氨逃逸量的影响。结果表明:首层催化剂入口烟气速度分布不均对脱硝反应影响不大;氨氮摩尔比分布不均对脱硝反应影响较大

当氨氮摩尔比为0.85∶1时

其相对偏差系数从0增大到30%

2层催化剂的脱硝效率从84.6%降低到77.8%

出口氨逃逸量从2.02×10-6增大到36.00×10-6。所以在设计SCR脱硝反应器时

应尽可能地提高喷氨格栅及混合器对NH3和NO的混合效果

使进入前层催化剂的氨氮摩尔比相对偏差控制在5%以内。

Abstract

To obtain a high de-NOxefficiency in selective catalytic reduction(SCR)reactor

a three-dimensional numerical model was established by using Fluent software coupled with detailed SCR reaction mechanism.On this basis

the effects of non-uniform distribution of both flue gas inlet velocity and mole ratio of NH3 to NO(n(NH3)∶n(NO))on the system de-NOxefficiency was investigated.The results show that

for the first catalyst layer

the uniform degree of flue gas inlet velocity has little influence on the system deNOxefficiency

while that of the mole ratio of NH3 to NO has a great influence.When the feed mole ratio of NH3 to NO equals 0.85∶1

the relative deviation coefficient of n(NH3)∶n(NO)increases from 0to 30%

the de-NOxefficiency of the second catalyst layer reduced from 84.6% to 77.8%.At the same time

the volume fraction of ammonia slip increased from 2.02×10-6 to 36.00×10-6.Therefore

during the SCR deNOxreactor design

it is necessary to improve the mixing of NO and NH3 with ammonia injection grid and mixer.

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