孔隙结构对水冷燃烧器燃烧换热特性的影响  

Effect of Pore Structure on the Combustion and Heat Transfer Characteristics of Water-Cooled Burners

作　　者：王恩宇[1,2,3] 张翔宇 史忠天 段润泽 田亮[1,2,3] Wang Enyu;Zhang Xiangyu;Shi Zhongtian;Duan Runze;Tian Liang(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;Hebei Key Laboratory of Thermal Science and Energy Clean Utilization,Tianjin 300401,China;Tianjin Key Laboratory of Clean Energy and Pollution Control,Tianjin 300401,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300401 [2]河北省热科学与能源清洁利用技术重点实验室,天津300401 [3]天津市清洁能源利用与污染物控制重点实验室,天津300401

出　　处：《燃烧科学与技术》2023年第1期27-35,共9页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(12042211,51806057);河北省自然科学基金资助项目(E2019202451,E2019202460)。

摘　　要：针对天然气等高热值气体燃烧时氮氧化物排放高和多孔介质烧蚀问题,设计开发了变孔隙多孔介质燃烧试验系统,研究了燃烧室内沿横向孔密度变化的孔隙结构对多孔介质中燃烧换热的影响.结果表明:燃烧室内平均孔密度相同条件下,孔密度沿横向由内而外先阶跃增加再阶跃减小的孔隙结构有利于燃烧放热沿冷却边界方向的传递,该燃烧室内整体温度低,从燃烧室中心截面处沿冷却边界方向的温差最大达568℃,多孔介质燃烧器的温升速率最小为16.2℃/min,平均传热系数最大为656.6 W/(m^(2)·℃);横向孔密度变化的6种燃烧室内芯结构采用水冷方式降低了燃烧室温度,NO排放都可以达到20 mg/m^(3)以下,而CO最高也仅有60 mg/m^(3).Aiming at high NOx emission and the erosion of porous media during the combustion of high calorific value gases,a variable porosity porous media combustion system was designed and developed. The effect of the pore structure varying along the transverse pore density inside the combustor on the heat transfer characteristics of combustion in porous media was investigated. The results show that under the same average pore density in the combustion chamber,the pore structure,in which the pore density increases transversely first and then decreases in a stepwise fashion from the inside to the outside,facilitates the transfer of combustion heat in the direction of the cooling boundary. The overall temperature in the combustion chamber is low. The maximum temperature difference from the central section of the combustion chamber to the cooling boundary is 568 ℃. The minimum temperature rise rate of the porous media burner is 16.2 ℃/min,and the maximum average heat transfer coefficient is 656.6 W/(m^(2)·℃). The temperature of combustion chamber is reduced by the water cooling method for 6 kinds of combustion chamber core structures with varying transverse hole density. The NO emission can drop below 20 mg/m^(3),and the highest CO emission is only 60 mg/m^(3).

关 键 词：变孔隙 多孔介质燃烧器 内芯结构 水冷 换热特性 

分 类 号：TK16[动力工程及工程热物理—热能工程]