Finite element numerical simulation of stress on long spraying gun of SNCR flue gas denitration system

GAO Ning; ZHANG Xiangyu; ZHANG Bo; LU Xu; XIANG Xiaofeng; XU Hongjie

doi:10.19666/j.rlfd.201809173

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Finite element numerical simulation of stress on long spraying gun of SNCR flue gas denitration system

更新时间：2025-09-28

- Finite element numerical simulation of stress on long spraying gun of SNCR flue gas denitration system
- Thermal Power Generation Vol. 48, Issue 4, Pages: 48-54(2019)
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201809173
  CLC： X701.7
- Published Online：01 April 2019，
  
  Published：2019
- 稿件说明：
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GAO Ning, ZHANG Xiangyu, ZHANG Bo, et al. Finite element numerical simulation of stress on long spraying gun of SNCR flue gas denitration system[J]. Thermal power generation, 2019, 48(4): 48-54.
DOI：

GAO Ning, ZHANG Xiangyu, ZHANG Bo, et al. Finite element numerical simulation of stress on long spraying gun of SNCR flue gas denitration system[J]. Thermal power generation, 2019, 48(4): 48-54. DOI： 10.19666/j.rlfd.201809173.

摘要

在选择性非催化还原(SNCR)脱硝技术中

还原剂与烟气混合的均匀程度对脱硝效率和氨逃逸量具有重要影响。SNCR脱硝长喷枪喷射还原剂覆盖范围广

适宜布置在锅炉空间较大区域。长喷枪结构自重大

伸入锅炉炉膛内工作时为悬臂梁结构

需要对其应力状态和结构变形程度进行评估。本文通过ANSYS软件有限元方法

分析已加工成型的6 m长喷枪及模拟6～11m长喷枪在冷态下的结构变形状态和VonMises等效应力情况

利用传热学计算方法得到长喷枪最外层不锈钢管内外壁温度后

对长喷枪小孔附近热应力进行分析。结果表明

在类似结构设计下

长喷枪的最大加工长度应小于8 m方可保证其在锅炉内安全运行。

Abstract

The mixing homogeneity of reductant and flue gas has significant influence on denitration efficiency and amount of ammonia slip in selective non-catalytic reduction(SNCR) denitration technology. The long spraying gun of the SNCR denitration system has a wide spray coverage and is suitable for application in large zone of the boiler. The long spraying gun shows a cantilever beam structure when working in the furnace of boiler

so it is necessary to evaluate the stress and deformation for its heavy weight. By the finite element method(ANSYS)

the structural deformation and Von Mises equivalent stress of 6～11 m spraying gun at cold state are analyzed. The heat transfer method is used to obtain the inner and outer wall temperatures of the outmost shell of the long spraying gun

then the thermal stress around the small hole of the long spraying gun is investigated. The result shows that

the length of the long spraying gun should be shorter than 8 m to ensure its safe operation in the boiler.

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