立式旋风燃烧器冷态实验及数值模拟研究  

Cold State Experiment and Numerical Simulation Study on Vertical Cyclone Burner

作　　者：徐维晖[1] 黄志豪[1] 房凡[2] 王为术[1] 王涵 何小可[1] XU Weihui;HUANG Zhihao;FANG Fan;WANG Weishu;WANG Han;HE Xiaoke(Institute of Thermal Energy Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;Xi'an Thermal Power Research Institute Co.Ltd.,Xi'an 710054,China)

机构地区：[1]华北水利水电大学热能工程研究中心,河南郑州450045 [2]西安热工研究院有限公司,陕西西安710054

出　　处：《工业加热》2022年第1期24-28,34,共6页Industrial Heating

基　　金：国家重点研发计划资助项目(2018YFB060413)。

摘　　要：针对立式纯燃高碱煤旋风燃烧器,按4∶1比例建立旋风燃烧器冷态物模实验系统,研究不同叶片倾角下燃烧器内空气动力学特性,同时通过ANSYS软件数值研究了不同叶片倾角对燃烧器内速度分布、温度分布、组分分布以及NO_(x)浓度分布的影响。研究结果表明:数值模拟与实验结果吻合较好,旋风燃烧器内空气动力场良好,轴向速度沿径向方向呈W型对称分布,叶片倾角越大,旋风燃烧器内轴向速度越小;在研究工况范围内,随着叶片倾角的增加,煤粉停留时间增加,旋风燃烧器出口温度先上升后降低,NO_(x)浓度先降低后升高;当叶片倾角为30°时,旋风燃烧器内燃烧温度较高,燃烧器出口NO_(x)浓度最低。For vertical cyclone burner with pure burning high alkali coal, according to the practical size, the experimental system of the cyclone burner was established at the ratio of 4∶1, and the aerodynamic characteristics of the burner under different blade inclinations were studied. The effect of different blade inclinations on the velocity distribution, temperature distribution, component distribution and NO_(x)concentration distribution in the burner were numerically studied by ANSYS software. The numerical simulation agree well with the experimental results. The results show that the aerodynamic field in the cyclone burner is good, and the axial velocity is distributed symmetrically along the radial direction in W-shaped, the larger the blade inclination, the smaller the axial velocity in cyclone burner it is. Under the range of study conditions, with the increase of blade inclination, the residence time of pulverized coal increases, the outlet temperature of cyclone burner increases first and then decreases, and NO;concentration decreases first and then increases. When the blade inclination is 30°, the combustion temperature in the cyclone burner is high and the NO_(x)concentration at the burner outlet is the lowest.

关 键 词：立式旋风燃烧器 叶片倾角 冷态实验 空气动力场 数值模拟 NO_(x)释放特性 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]