钝体燃烧器在烟气再循环条件下的燃烧模拟  

Combustion Simulation of Blunt Body Burners Under Flue Gas Recirculation Conditions

作　　者：于鹤 Yu He(Danyang Zhongxin Huahai Clean Energy Co.,Ltd.,Jiangsu,212300)

机构地区：[1]丹阳中鑫华海清洁能源有限公司,江苏212300

出　　处：《当代化工研究》2023年第22期41-43,共3页Modern Chemical Research

摘　　要：研究了钝体燃烧器内煤粉在高温烟气助燃下的着火特性。首先对燃烧器及一维炉进行建模并划分网格,然后对该燃烧系统进行燃烧数值模拟。通过改变烟气温度及烟气速度来观察着火距离的变化,测量计算不同工况下的着火距离,并对计算结果进行数据处理,分析着火距离的变化趋势,从而得出最佳燃烧工况。研究发现,当烟气温度为1000K、烟气流速为14m/s时,着火距离最短,为139.2mm,且温度场等均具有良好的对称性。研究结论表明在烟气质量流量一定时,升高烟气温度也能够缩短着火距离,并能够提高炉膛整体温度水平以及改善炉内各成分的分布,对于煤粉的燃烧及稳燃有着促进作用。In this paper,the characteristics of pulverized coal fuelled by high temperature flue gas in a one-dimensional furnace by a blunt body burner are studied.Firstly,the internal structure of one-dimensional furnace is modeled and the grid is divided.Then the combustion system is numerically simulated.Other conditions remain unchanged,the change of the ignition distance is observed by changing the temperature and speed of the flue gas,and the ignition distance under different working conditions is measured and calculated,and the data is processed to observe the changing trend of the ignition distance,so as to obtain the best combustion condition.When the flue gas mass flow rate is constant,increasing the flue gas temperature can also shorten the ignition distance,improve the overall temperature level of the furnace and improve the distribution of various components in the furnace,and promote the combustion and steady combustion of pulverized coal.Due to the limited simulated working conditions,in the simulated working conditions,the flue gas temperature is 1000 K,the flue gas flow rate is 14 m/s,and the ignition distance is the shortest,which is 139.2 mm,and the temperature field and other diagrams have good symmetry.

关 键 词：钝体燃烧器 数值模拟 烟气再循环 煤粉燃烧 

分 类 号：TQ[化学工程]