鼓风式燃气灶低氮燃烧数值模拟研究  

Numerical simulation of low nitrogen combustion in blast gas stove

作　　者：徐顺生[1,2] 于东港 鞠澄源 王京 冉伟铃 Shunsheng XU;Donggang YU;Chengyuan JU;Jing WANG;Weiling RAN(School of Mechanical Engineering,Xiangtan University,Xiangtan,Hunan 411105,China;School of Energy Science and Engineering,Central South University,Changsha,Hunan 410083,China)

机构地区：[1]湘潭大学机械工程学院,湖南湘潭411105 [2]中南大学能源科学与工程学院,湖南长沙410083

出　　处：《过程工程学报》2023年第3期438-450,共13页The Chinese Journal of Process Engineering

基　　金：国家自然科学青年基金资助项目(编号:51806184);湘潭市科技计划项目(编号:CG-YB20201006)。

摘　　要：合适的结构、运行参数能显著降低燃烧器的氮氧化物(NOx)和CO排放。基于数值计算的方法建立了35 kW鼓风式燃气灶的数学模型,通过实际运行数据与模拟结果的对比验证了该数值模型的可靠性。采用模拟计算与正交试验相结合的方法,验证了旋流燃烧的合理性,研究了燃烧室高度、空气系数、一、二次风配比以及二次风入射角度对旋流燃气灶燃烧性能的影响。结果表明,上述因素对NOx和CO排放的影响程度不同,影响NOx和CO排放的最主要因素分别为空气系数和一、二次风配比,根据正交数值实验分析,当燃烧室高度为330 mm,空气系数为1.15,一、二次风配比为2:1,二次风入射角度α为60°时,燃烧器NOx和CO排放量最少,计算值分别为13.6和308 mg/m^(3),较优化前对应的33.0和898 mg/m^(3)分别降低19.4和590 mg/m^(3)。The problem of air pollution is becoming increasely serious,and it brings more and more problems to people's health.As one of the main sources of pollutants,choosing appropriate structure and operating parameters to reduce the pollutant emission of burner has become the research focus of many researchers.The combustion efficiency and emission of the burner are often determinedbymany factors.However,the existing studies mostly adopt localanalysis,wwhich only consider the impact of a single factor on the combustion efficiency and pollutant emission,and do not consider the impact of the correlation of various factors on the combustion performance of the burner.Due to the high cost of experiments,the optimization of multiple design parameters to improve the combustion performance of burner is still lack of systematic research.Taking a blast gas stove at 35 kW as the case study,the staged combustion model of the air flow inside the combustion chamber established is implemented by FLUENT to analyze the effects of different parameters and the model is verified by experimental data.In order to reduce the emission concentration of NOx and CO in the combustion chamber,a cyclone is installed on the original blast gas stove,and the combustion chamber height,air coefficient,the volume ratio of primary air to secondary air and the incident angle of secondary air are analyzed by numerical simulation,and the orthogonal experimental analysis is carried out finally.The results show that compared to the original parameters,the NOx concentration and the CO concentration discharged under the optimal situation decreased by 19.4 and 590 mg/m',respectively.The study plays a role in the parameter optimization of the methane burner for reducing NOx and CO emission.It provides guidance for the design of low pollution combustion emission ofburner.

关 键 词：旋流燃烧器 数值模拟 降氮燃烧 燃烬风 正交分析 

分 类 号：TU996.75[建筑科学—供热、供燃气、通风及空调工程] X701[建筑科学—市政工程]