Erosion of Economizer Tube Bundles in Pressurized Oxy-Fuel Coal-Fired Boiler

doi:10.7652/xjtuxb201303010

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Erosion of Economizer Tube Bundles in Pressurized Oxy-Fuel Coal-Fired Boiler

更新时间：2025-07-09

- Erosion of Economizer Tube Bundles in Pressurized Oxy-Fuel Coal-Fired Boiler
- Vol. 47, Issue 3, Pages: 53-59(2013)
- 作者机构：
  
  华北电力大学能源与动力工程学院,河北,保定,071003
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201303010
  CLC： TK223.3
- Online First：10 March 2013，
  
  Published：2013
- 稿件说明：
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Erosion of Economizer Tube Bundles in Pressurized Oxy-Fuel Coal-Fired Boiler[J]. 2013, 47(3): 53-59.
DOI：

Erosion of Economizer Tube Bundles in Pressurized Oxy-Fuel Coal-Fired Boiler[J]. 2013, 47(3): 53-59. DOI： 10.7652/xjtuxb201303010.

摘要

针对常压空气燃烧和增压富氧燃烧两种工况

利用CFD软件、应用k-ε双方程模型模拟锅炉省煤器管束间烟气的流动

用拉格朗日方法研究管束间颗粒的运动

并利用颗粒与管壁的碰撞和反弹模型考虑颗粒与壁面碰撞后的运动。通过对比3种磨损模型

得出Oka模型考虑的因素相对更全面

与实验数据也比较吻合。利用该模型可得壁面磨损量随流速呈指数规律变化

随着入射角度的增大磨损量先增加后减小

壁面材料硬度越大

磨损量越小

并且随着颗粒粒径增大磨损量略有增加。增压富氧燃烧下

最大磨损速率比常压下小很多

且最大磨损位置也发生了变化

各管排的颗粒撞击和平均磨损速率分布较均匀

除了第1排管外

单管最大磨损区域位于管壁迎风阶两侧60°附近。这对省煤器实际运行及增压富氧燃烧下省煤器的设计有重要意义。

Abstract

A simulation on the flue gas flow between the economizer tube bundles was performed using the k-ε two-equation model in the CFD software. The particle motion between the bundles was examined by the Lagrangian method and the particle motion after collision with the wall was investigated using the collision and bounce model for the situations of atmospheric air combustion and pressurized oxy-fuel combustion. By comparing three wear models

it is found that model Oka is relatively more comprehensive and more consistent with the experimental data. According to the model

the amount of wall erosion changes exponentially with an increase in the flow rate

and it increases first and then decreases with the increase in the incidence angle. The erosion decreases with an increase in the hardness of the wall

and it increases slightly with the particle size. Under pressurized oxy-fuel combustion

the maximum erosion rate is much lower than that under atmospheric condition

the position of the maximum erosion changes and the particle impact and erosion rate distributes more uniform on each tube row. The single-tube maximum erosion area is located near 60 degrees of the wall on both sides of the windward-order except the first row. These results are of significance for the economizer design and operation under pressurized oxy-fuel combustion.

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references

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