煤粉燃烧火焰特征影响因素的分析研究  

Analysis and Study on the Influencing Factors of Flame Characteristics in Pulverized Coal Combustion

作　　者：王铁健 闫文刚 程海鹰 苏燕芹 张志明 WANG Tiejian;YAN Wengang;CHENG Haiying;SU Yanqin;ZHANG Zhiming(Inner Mongolia University of Technology School of Mechanical Engineering,Hohhot 010051,China;Chang'an University,School of Engineering Machinery,Xi'an 710064,China;Engineering Research Center of Highway Construction Equipment and Technology,Ministry of Education,Xi'an 710064,China)

机构地区：[1]内蒙古工业大学机械工程学院,呼和浩特010051 [2]长安大学工程机械学院,西安710064 [3]高速公路筑养装备与技术教育部工程研究中心,西安710064

出　　处：《工程热物理学报》2024年第12期3906-3914,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51665043);内蒙古自治区科技计划资助项目(No.2020GG0269);内蒙古自治区重大基础研究开放课题(No.2017030256)。

摘　　要：煤粉燃烧火焰的稳定性影响燃烧效率和污染物排放量。为了探究火焰燃烧稳定性的影响因素,本文根据骨料烘干工艺需求,运用燃烧学、传质传热、多相流动等相关理论,构建湍流流动、热辐射、离散相以及燃烧等行为的控制模型,采用数值模拟与实验验证相结合的方法,研究了过量空气系数和预热风温度对煤粉燃烧火焰的影响。研究表明:过量空气系数及预热风温度均会对骨料烘干煤粉燃烧火焰特征产生影响;过量空气系数由1.0增加至1.3,火焰长度降低12.1%,火焰体积降低16.3%,高温占有率升高6.1%,火焰整体变形量增加;预热风温度由303 K增加至373 K,火焰长度提升17.1%,火焰体积提升10.8%,高温占有率提升14.7%,火焰整体变形量增加;当过量空气系数为1.2,预热风温度为343 K时,火焰特征达到最佳,具有较好稳定性,燃烧效率高,污染物排放量小。Pollutant emissions and combustion efficiency of pulverized coal are influenced by the stability of the fame during combustion.This paper uses the related theories of combustion,mass and heat transfer,multiphase flow,and other related theories to construct the control model of turbulent fow,thermal radiation,discrete phase,and combustion.It then studies the influence of excess air coefficient and preheating air temperature on the combustion flame of pulverized coal by combining numerical simulation and experimental verification.This research aims to investigate the influencing factors of flame combustion stability in accordance with the requirements of the aggregate drying process.The findings indicate that the features of the combustion flame of aggregate drying pulverized coal will be influenced by the surplus air coeficient and preheating air temperature.The flame length fell by 12.1%,the flame volume reduced by 16.3%,the high temperature occupancy increased by 6.1%,the surplus air coefficient increased from 1.0 to 1.3,and the total flame deformation increased.The temperature of the preheating air rose from 303 K to 373 K,and there was an increase in flame length 17.1%,fame volume 10.8%,high temperature occupancy 14.7%,and total flame deformation.Good stability,high combustion eficiency,and low pollutant emissions are the characteristics of the optimum flame when the surplus air coefficient is 1.2 and the preheating air temperature is 343 K.

关 键 词：煤粉燃烧 过量空气系数 预热风温度 火焰特征 骨料烘干 

分 类 号：TH16[机械工程—机械制造及自动化]