Numerical Simulation of the Flow Characteristics of a Flue Gas Damper

doi:10.7652/xjtuxb202102011

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Numerical Simulation of the Flow Characteristics of a Flue Gas Damper

更新时间：2025-07-09

- Numerical Simulation of the Flow Characteristics of a Flue Gas Damper
- Vol. 55, Issue 2, Pages: 93-99(2021)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202102011
  CLC： TM621.2
- Online First：10 February 2021，
  
  Published：2021
- 稿件说明：
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Numerical Simulation of the Flow Characteristics of a Flue Gas Damper[J]. 2021, 55(2): 93-99.
DOI：

Numerical Simulation of the Flow Characteristics of a Flue Gas Damper[J]. 2021, 55(2): 93-99. DOI： 10.7652/xjtuxb202102011.

摘要

为了优化烟气挡板的工作开度区间以提高锅炉热效率和适应调峰的能力

在烟气速度为18 m/s的条件下

分别模拟了某烟气挡板在开度10°、20°、30°、40°、50°、60°、70°、80°和90°下的速度云图、压力云图、流阻系数和流量系数

并评价了烟气挡板的流动特性。研究结果表明:随着挡板开度的增大

下游烟气的速度场和压力场的均匀性逐渐变好

流阻系数先快速后缓慢地减小

而流量系数则先缓慢后快速地增加; 当挡板全开时

挡板的阻力小于100 Pa

流阻系数小于1.08; 在余热利用装置的引风机全压为1 000 Pa

挡板开度介于17°～80°范围内时

烟气流量随挡板开度的变化特性良好。综合考虑挡板的流阻系数特性

建议该挡板的常用工作开度区间为40°～80°。

Abstract

To optimize the working opening degree range of flue gas damper to improve boiler’s thermal efficiency and the ability to adapt to peak load regulation

the flow fields of a flue gas damper with opening degrees of 10°

20°

30°

40°

50°

60°

70°

80° and 90° are simulated under the condition that the flue gas velocity is 18 m/s. The flow characteristics of the flue gas damper is evaluated according to the flow resistance coefficients

flow coefficients

and the distributions of velocity and pressure of different opening degrees of the flue gas damper. The results show that the uniformity of velocity field and pressure field of downstream flue gas gradually becomes better with the increase of damper opening degree. Along with the increase of damper opening degree

the flow resistance coefficient first decreases rapidly and then decreases slowly and the flow coefficient first increases slowly and then increases rapidly. The resistance of the damper is less than 100 Pa and the flow resistance coefficient of the damper is less than 1.08 when the damper is fully opened. If the total pressure of induced draft fan in the waste heat utilization device is 1 000 Pa

the variation characteristics of flue gas flow is well with the damper opening degree when the damper opens in the range of 17°- 80°. Considering the flow resistance coefficient characteristics of the damper

it is suggested that its opening degree range in common operation is from 40° to 80°.

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references

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