Reason analysis on abrasion of upper catalyst layer in an SCR deNO<sub>x</sub> device:field test and numerical simulation

XIA Liwei; ZHANG Xuesuo; WEI Hongqi; SHENG Bo

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Reason analysis on abrasion of upper catalyst layer in an SCR deNO_x device:field test and numerical simulation

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- Reason analysis on abrasion of upper catalyst layer in an SCR deNO_x device:field test and numerical simulation
- Thermal Power Generation Vol. 44, Issue 2, Pages: 110-114(2015)
- 作者机构：
  
  1. 皖能马鞍山发电有限公司
  2. 东南大学能源与环境学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： X773
- Published：2015
- 稿件说明：
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XIA Liwei, ZHANG Xuesuo, WEI Hongqi, et al. Reason analysis on abrasion of upper catalyst layer in an SCR deNO_x device:field test and numerical simulation[J]. Thermal power generation, 2015, 44(2): 110-114.
DOI：

XIA Liwei, ZHANG Xuesuo, WEI Hongqi, et al. Reason analysis on abrasion of upper catalyst layer in an SCR deNO_x device:field test and numerical simulation[J]. Thermal power generation, 2015, 44(2): 110-114. DOI：

摘要

采用冷态试验与数值模拟相结合的方式

对某电厂660 MW机组锅炉选择性催化还原(SCR)烟气脱硝系统内部流场进行测试计算

分析了该脱硝系统上层催化剂在横梁两侧区域磨损比较严重的原因。结果表明

催化剂磨损与其上方的流场有直接关系。气流经过转向烟道撞击横梁后在一侧形成高速向下气流

并在靠近催化剂入口处分成两股不同方向的气流

一股气流继续沿垂直方向向下运动

另一股气流受涡流影响

向水平方向偏斜

从而使横梁两侧下方催化剂出现不同特点的严重磨损。

Abstract

In order to deal with serious abrasion on upper catalyst layer at both sides of beam in an SCR denitration device and ensure the equipment's efficient and safe operation

field test combined with numerical simulation was conducted to analyze the flow field inside the denitration system for a 660 MW unit boiler.The reasons for serious abrasion of the upper catalyst layer around beam area were investigated.The experimental results dovetailed nicely with that of the numerical simulation

and they both agreed well with the actual abrasion situation.The results indicate that the abrasion of the catalyst is directly related to the flow field above the catalyst layer.The gas stream after turning flue is separated by the supporting beams so that a high-speed downstream airflow is formed at the front side of the beam

which is then divided into two airflows with different directions at the catalyst layer entrance.One of the airflow moves down in the vertical direction while the other deflects horizontally due to the vortexes.As a result

the catalyst at both sides of the beam is worn seriously.

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Related Institution

School of Chemistry and Chemistry Engineering, South China University of Technology

Science and Technology Development Branch of Jilin Electric Power Co., Ltd.

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School of Energy and Power Engineering, Northeast Dianli University

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Reason analysis on abrasion of upper catalyst layer in an SCR deNOx device:field test and numerical simulation

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Reason analysis on abrasion of upper catalyst layer in an SCR deNO_x device:field test and numerical simulation