Operational Characteristics and Thermodynamic Calculation Method for Chain-Grate Stokers under Low-Pressure Conditions

ZONG Siyu; DU Yongbo; XU Qiong; ZHANG Jingkun; DA Yaodong; CHE Defu

doi:10.7652/xjtuxb202508006

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Operational Characteristics and Thermodynamic Calculation Method for Chain-Grate Stokers under Low-Pressure Conditions

更新时间：2025-07-30

- Operational Characteristics and Thermodynamic Calculation Method for Chain-Grate Stokers under Low-Pressure Conditions
- Journal of Xi’an Jiaotong University Vol. 59, Issue 8, Pages: 53-63(2025)
- 作者机构：
  
  1.西安交通大学能源与动力工程学院， 710049，西安
  2.中国特种设备检测研究院， 100029，北京
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202508006
  CLC： TK16
- Received：13 January 2025，
  
  Online First：09 April 2025，
  
  Published：10 August 2025
- 稿件说明：
移动端阅览
ZONG Siyu, DU Yongbo, XU Qiong, et al. Operational Characteristics and Thermodynamic Calculation Method for Chain-Grate Stokers under Low-Pressure Conditions[J]. Journal of Xi’an Jiaotong University, 2025, 59(8): 53-63.
DOI：

ZONG Siyu, DU Yongbo, XU Qiong, et al. Operational Characteristics and Thermodynamic Calculation Method for Chain-Grate Stokers under Low-Pressure Conditions[J]. Journal of Xi’an Jiaotong University, 2025, 59(8): 53-63. DOI： 10.7652/xjtuxb202508006.

摘要

针对低气压导致锅炉出现的出力不足、排烟温度升高及效率下降等问题，以某10 t/h燃煤链条炉为研究对象，采用数值方法分析了气压下降对炉膛内温度分布、煤的燃尽情况和炉膛出口烟气参数的影响规律。通过用户自定义函数实现煤颗粒在炉排上的运动，并根据实际链条炉的炉排结构，对模拟真实炉排孔隙的三维物理模型加以改进。考虑到燃烧中灰层不断累积在炭核表面，阻碍氧气扩散进而对燃烧速率造成的影响，改进了焦炭燃烧模型。数值结果表明：随着气压降低，炉排煤颗粒相较常压下的燃烧进程推迟，焦炭燃尽率减小；炉膛出口的NO

排放量先增大后减小，其在77.273 kPa下的增幅约为常压下的8.79%；低气压下，气体火焰黑度减小造成辐射传热量减少，炉膛出口烟气温度升高，但气压过低时，由于不完全燃烧热损失的增大，炉膛出口烟气温度略有降低。提出的

数（火焰形状系数）修正公式可为低气压下采用热力计算方法预测炉膛出口烟气温度提供参考。

Abstract

To address the issues of insufficient output

increased flue gas temperature

and decreased efficiency caused by low pressure in boilers

this study focuses on a 10 t/h coal-fired chain grate boiler. A numerical method is employed to analyze

the effects of pressure drop on temperature distribution within the furnace

coal burnout

and flue gas parameters at the furnace exit. Through a user-defined function

the motion of coal particles on the grate is simulated

and the three-dimensional physical model is improved to accurately reflect the actual grate structure. Considering the accumulation of ash on the surface of the carbon core during combustion

which hinders oxygen diffusion and affects the combustion rate

the coke combustion model is refined. Numerical results indicate that as pressure decreases

the combustion process of coal particles on the grate is delayed compared to normal pressure

resulting in a reduced coke burnout rate. The NO

emissions at the furnace exit initially increase and then decrease

with an increase of approximately 8.79% at 77.273 kPa compared to normal pressure. Under low pressure

the reduced blackness of the gas flame leads to decreased radiative heat transfer

causing an increase in the flue gas temperature at the furnace exit. However

when the pressure is too low

the increase in heat loss due to incomplete combustion slightly lowers the furnace exit flue gas temperature. The proposed correction formula for the

number provides a reference for predicting the flue gas temperature at the furnace exit using thermodynamic calculation methods under low pressure conditions.

关键词

Keywords

references

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