Numerical Simulation Study on Characteristics and Prevention Methods of Ash Deposition in Thermal Power Units Flue

YAN Youyang; CHEN Donglin; YANG Zhan; WANG Shuaihao

doi:10.3969/j.issn.1008-0198.2025.02.008

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Numerical Simulation Study on Characteristics and Prevention Methods of Ash Deposition in Thermal Power Units Flue

更新时间：2025-11-30

- Numerical Simulation Study on Characteristics and Prevention Methods of Ash Deposition in Thermal Power Units Flue
- Vol. 45, Issue 2, Pages: 63-68(2025)
- 作者机构：
  
  长沙理工大学能源与动力工程学院,湖南,长沙,410114
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.1008-0198.2025.02.008
  CLC： TK227.3
- Published Online：30 April 2025，
  
  Published：2025
- 稿件说明：
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闫优洋, 陈冬林, 杨展, 王帅浩. 火电机组烟道积灰特性及防治方法的数值模拟研究[J]. 湖南电力, 2025, 45(2): 63-68.

YAN Youyang, CHEN Donglin, YANG Zhan, et al. Numerical Simulation Study on Characteristics and Prevention Methods of Ash Deposition in Thermal Power Units Flue[J]. 2025, 45(2): 63-68.
闫优洋, 陈冬林, 杨展, 王帅浩. 火电机组烟道积灰特性及防治方法的数值模拟研究[J]. 湖南电力, 2025, 45(2): 63-68. DOI： 10.3969/j.issn.1008-0198.2025.02.008.

YAN Youyang, CHEN Donglin, YANG Zhan, et al. Numerical Simulation Study on Characteristics and Prevention Methods of Ash Deposition in Thermal Power Units Flue[J]. 2025, 45(2): 63-68. DOI： 10.3969/j.issn.1008-0198.2025.02.008.

摘要

针对火电机组深度调峰引发的烟道内积灰问题

通过构建烟道结构几何模型及内部流动的数学模型

基于Fluent的数值模拟方法

研究机组不同负荷工况下烟道内飞灰沉积特性及其颗粒分布特性

并基于工程实践经验提出烟道防积灰方法——烟道内加装导流板和高速射流喷管。模拟研究表明：当机组负荷低于80%时烟道内飞灰开始沉积

而当负荷低于40%时烟道内飞灰大量沉积;不同结构烟道的飞灰颗粒沉积量呈现出以下规律：T型烟道直角弯头水平烟道渐变烟道

且所沉积的飞灰颗粒90%以上直径大于34 μm;与现有烟道相比

加装导流板或射流喷管后的烟道在机组低至40%负荷运行时飞灰沉积量可减少29.16%~58.62%。

Abstract

In order to solve the problem of ash deposition in the flue caused by deep peak loading regulation of thermal power units

based on the numerical simulation method of Fluent

the characteristics of fly ash deposition and particle distribution in the flue under different load conditions of thermal power units are studied by constructing a geometric model of the flue structure and a mathematical model of its internal flow. A method to prevent ash deposition in the flue is put forward based on the practical experience of engineering

which is to install a baffle and a high-speed jet nozzle in the flue. The simulation results show that fly ash begins to deposit in the flue when the load of the unit is lower than 80%

and a large number of fly ash deposits in the flue when the load is lower than 40%. The pattern of fly ash particle deposition in different flue structures is as follows: T-shaped flueright-angle elbowhorizontal fluegradual flue. And more than 90% of the deposited fly ash particles are larger than 34 μm in diameter. Compared with the existing flue

the flue equipped with the baffle or jet nozzle can reduce the fly ash deposition by 29.16%~58.62% when the unit is operating at 40% of the rated load.

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