Numerical simulation on single channel catalyst in selective catalytic reduction system

ZHAO Dazhou; HE Sheng; SI Fengqi; XU Zhigao

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Numerical simulation on single channel catalyst in selective catalytic reduction system

Thermal Power Generation Vol. 45, Issue 4, Pages: 100-105(2016)

更新时间：2025-09-28

- Numerical simulation on single channel catalyst in selective catalytic reduction system
- 作者机构：
  
  1. 华电电力科学研究院
  2. 东南大学能源与环境学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： X773
- Published：2016
- 稿件说明：
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ZHAO Dazhou, HE Sheng, SI Fengqi, et al. Numerical simulation on single channel catalyst in selective catalytic reduction system[J]. Thermal Power Generation, 2016, 45(4): 100-105.
DOI：

ZHAO Dazhou, HE Sheng, SI Fengqi, et al. Numerical simulation on single channel catalyst in selective catalytic reduction system[J]. Thermal Power Generation, 2016, 45(4): 100-105. DOI：

摘要

考虑内外扩散以及副反应的影响

采用Fluent软件

建立了选择性催化还原(SCR)脱硝反应单孔催化剂三维模型

并以E-R反应动力学为基础

研究了运行参数和催化剂壁厚对脱硝效率和SO_2转化率的影响。结果表明:SCR脱硝反应工作温度区间较宽

为553~653K;当温度超过653K

由于副反应的加剧

脱硝效率显著下降;在催化剂中沿烟气流向温度略有升高

但放热现象不明显;随着氨氮摩尔比的升高

脱硝效率逐渐升高

SO_2的转化率降低

氨逃逸增加;随着空速的增加

脱硝效率和SO_2的转化率均降低;SO_2转化率随催化剂壁厚的增加而线性增加

但由于内扩散的限制

脱硝效率随催化剂壁厚的增大而显著降低。

Abstract

Considering the influence of internal and external diffusion and the adsorption of ammonia

the Fluent software was applied to establish the three dimensional model for single channel catalyst during selective catalytic reduction denitration process.On the basis of the E-R reaction kinetics

the effects of operation parameters and catalyst layer thickness on the denitration efficiency and SO_2 conversion rate were investigated.The simulation results show that

the denitration reaction has a wide operating temperature window which ranges from 553 Kto 653K.At temperature above 653 K

with the aggravation of the side effects

the denitration efficiency decreased significantly.Along the flow gas flowing direction in the catalyst

the reaction temperature rises slightly

but the exothermic phenomenon is not obvious.With an increase in mole ratio of NH_3 to NO

the denitration efficiency and ammonia escape rate increased while the conversion rate of SO_2 decreased.High space velocity can reduce both the denitration efficiency and the SO_2 conversion rate.In addition

the SO_2 conversion rate increases linearly with wall thickness of the catalyst.Due to the limitation of inner diffusion

the denitration efficiency drops significantly with the increasing catalyst wall thickness.

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Related Institution

Key Laboratory of Energy Heat Conversion and Process Measurement and Control, Ministry of Education, Southeast University

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