Numerical Simulation Study of Pulse-type Hood Technology for Large CFB Boiler

LIU Zhicun; WANG Quanhai; LI Jianbo; LU Xiaofeng; WANG Yingqiu

doi:10.19805/j.cnki.jcspe.2026.240807

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Numerical Simulation Study of Pulse-type Hood Technology for Large CFB Boiler

更新时间：2026-07-16

- Numerical Simulation Study of Pulse-type Hood Technology for Large CFB Boiler
- Chinese Journal of Power Engineering Vol. 46, Issue 7, Pages: 144-151(2026)
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.240807
  CLC： TK229.6
- Published：2026
- 稿件说明：
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刘志村, 王泉海, 李建波, 卢啸风, 王瀛丘. 大型CFB锅炉脉冲风帽技术数值模拟研究[J]. 动力工程学报, 2026, 46(7): 144-151.
刘志村, 王泉海, 李建波, 卢啸风, 王瀛丘. 大型CFB锅炉脉冲风帽技术数值模拟研究[J]. 动力工程学报, 2026, 46(7): 144-151. DOI： 10.19805/j.cnki.jcspe.2026.240807.

DOI： 10.19805/j.cnki.jcspe.2026.240807

摘要

为改善循环流化床(CFB)锅炉调峰运行时的颗粒流化质量

研发了一种新型脉冲风帽

并进行了数值模拟研究。结果表明:风量比低于40%时仍具有足够的脉冲效果

高于40%后脉冲强度随着风量的增大而增大;满风量下

模拟风温为20、100、250 ℃时

脉冲风帽进出口两端阻力压降是2.31、4.03、5.65 kPa;气流在脉冲风帽内部流动时

会在Helmholtz振荡腔渐缩段、腔室等位置产生局部加速

其出口射流"雨滴形"的运动轨迹是风帽顶部产生流化死区的主要原因;内芯小孔等位置会导致较大的阻力压降

也是整个脉冲风帽阻力的核心来源;风帽外罩开孔数为10时既可以保证较好的流化效果

又能防止顶部颗粒的积累。

Abstract

A novel pulse-type hood has been developed to improve particle fluidization quality during peak-shaving operation of circulating fluidized bed (CFB) boilers

with numerical simulations conducted for research. Results indicate that a sufficient pulsation effect is still achieved when the air flow ratio is below 40%

and the pulsation intensity increases with the rise in air flow ratio above 40%. Under full air flow rate conditions

when the simulated air temperatures are 20

100

and 250 ℃

the pressure drops across the inlet and outlet of the pulse-type hood are measured to be 2.31

4.03

and 5.65 kPa

respectively. When the air flows inside the pulse-type hood

localized acceleration occurs at positions such as the contraction section and the chamber of Helmholtz oscillation cavity. The "raindrop-shaped" trajectory of the outlet jet is identified as the main reason for the formation of fluidization dead zones at the top of the hood. Significant pressure drops are caused by positions such as the small orifices in the inner core

which are also the core sources of the overall resistance of pulse-type hood. It has been found through optimization that when the number of openings in the outer cover of the hood is 10

both good fluidization effects can be ensured and the accumulation of particles at the top can be prevented.

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references

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