A Multi-dimensional Hybrid Modelling Method for Pulverized Coal Boiler Secondary Air Accurate Description and Air Distribution Numerical Simulation Research

CAO Yuanhao; CHEN Xi; ZHOU Guanwen; SHI Jianliang; HUANG Guoshun

doi:10.19805/j.cnki.jcspe.2025.240558

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A Multi-dimensional Hybrid Modelling Method for Pulverized Coal Boiler Secondary Air Accurate Description and Air Distribution Numerical Simulation Research

更新时间：2025-11-28

- A Multi-dimensional Hybrid Modelling Method for Pulverized Coal Boiler Secondary Air Accurate Description and Air Distribution Numerical Simulation Research
- Chinese Journal of Power Engineering Vol. 45, Issue 11, Pages: 1777-1786(2025)
- 作者机构：
  
  1. 东南大学苏州联合研究生院,江苏,苏州,215123
  2. 碳中和科学技术研究院(东南大学),江苏,南京,210096
  3. 能源热转换及其过程测控教育部重点实验室(东南大学),江苏,南京,210096
  4. 国能承德热电有限公司,河北,承德,067000
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240558
  CLC：
- Published Online：17 November 2025，
  
  Published：17 November 2025
- 稿件说明：
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曹元昊,陈曦,周冠文,石建良,黄国顺. 面向二次风精确描述的燃煤锅炉多维混合建模方法及变配风数值模拟研究动力工程学报, 2025, 45(11): 1777-1786 https://doi.

org/10.19805/j.cnki.jcspe.2025.240558
曹元昊,陈曦,周冠文,石建良,黄国顺. 面向二次风精确描述的燃煤锅炉多维混合建模方法及变配风数值模拟研究动力工程学报, 2025, 45(11): 1777-1786 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240558.

org/10.19805/j.cnki.jcspe.2025.240558 DOI：

摘要

计算流体力学(CFD)模拟广泛用于锅炉设计及运行优化

但模拟过程常将二次风简化为速度边界条件

难以反映锅炉实际运行中风门开度对于风速的非线性调节作用

以及风门间的相互影响。针对以上问题

提出了一种基于多维混合建模的耦合数值模拟方法

即对锅炉炉膛建立三维数理模型

对锅炉二次风系统建立一维模型

并且在风门处进行压力与速度耦合。利用该方法对某330 MW四角切圆燃煤锅炉进行数值模拟并验证

同时对锅炉在均等、正宝塔、倒宝塔、缩腰4种配风工况的燃烧特性进行分析。结果表明:所建立的模型能够精确反映出二次风门开度变化对燃烧的影响;正宝塔配风燃烧器区温度相对较高

倒宝塔配风相对较低

均等和缩腰配风炉内的温度分布类似且较平均;正宝塔配风CO摩尔分数相对较低

而倒宝塔相对较高

均等和缩腰配风的CO摩尔分数分布较平均。

Abstract

Computational fluid dynamics (CFD) numerical simulation has been widely applied in boiler design and operation optimization. However

in simulation process

the secondary air is often simplified as a velocity boundary condition

which makes it difficult to reflect the non-linear adjustment effect of damper opening on air velocity and the mutual influence among dampers during the actual operation of boiler. In response to above problems

a coupled numerical simulation method based on multi-dimensional modelling was proposed

by establishing a three-dimensional mathematical model for boiler furnace and a one-dimensional model for boiler secondary air system

while coupling the pressure and velocity in air dampers. Numerical simulation and validation were conducted on a 330 MW tangentially fired coal-fired boiler using this method

and the combustion characteristics of boiler under four air distribution conditions

including uniform

positive pagoda-shaped

inverted pagoda-shaped

and waist-shrinking

were analyzed. Results show that the model can accurately reflect the impact of secondary air damper opening change on combustion. In the burner zone

the temperature is relatively higher under positive pagoda-shaped air distribution

while it is lower under inverted pagoda-shaped air distribution. The temperature distributions in furnace under uniform and waist-shrinking air distribution are similar and relatively uniform. The CO mole fraction is relatively low under positive pagoda-shaped air distribution

while it is comparatively higher under inverted pagoda-shaped air distribution. In contrast

the CO mole fraction distributions are relatively uniform under both uniform and waist-shrinking air distributions.

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references

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