摘要
借助FLUENTCFD软件平台 ,应用Eulerian/Lagrangian方法 ,在 3种不同工况下 ,对2 0 0MW四角切向燃烧煤粉锅炉炉内的流动、传热及燃烧进行了数值模拟 .为减小数值伪扩散的影响 ,采用了改进网格系统的措施 .模拟结果表明 :炉内最高温度出现在燃烧器区域 ,随着炉膛高度的增加 ,温度逐渐降低 ;整个炉膛空间存在旋转流场 ,从下至上旋转强度从弱到强 ,然后再逐渐减弱 ,直到炉膛出口仍存在残余旋流 ;炉内CO、O2 和CO2 的质量浓度分布与温度分布有很大关系 ,高温区对应着高的CO质量浓度和低的O2 、CO2 质量浓度 .数值模拟结果为锅炉的运行和改造提供了参考依据 .
Using a CFD software FLUENT, an Eulerian/Lagrangian approach was employed to investigate numerically the flow field, heat transfer and combustion process in a tangentially fired furnace of 200 MW pulverized coal boiler. Three different cases were simulated. To reduce the influence of the numerical pseudo-diffusion on the computational results, a measure was taken to improve the grid system so that fluids enter the control unit in the direction of perpendicular to the unit's border, not 45 degrees to the border. The simulation results show that temperature drops with the increase of furnace height, and the highest temperature appears in the area of the burners; from bottom to top, the intensity of swirl firstly strengthens and then weakens in the furnace, but residual swirl still exists at the exit of furnace; the distributions of CO, O2 and CO2 concentration are strongly related to the temperature field, that is, the high temperature area corresponds to the high CO and low O2 and CO2 concentration area. The distributions of the velocity, temperature and the particles' trajectories in the furnace were also obtained and analyzed.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2002年第3期241-245,共5页
Journal of Xi'an Jiaotong University
基金
国家"九七三"重点基础研究发展规划资助项目 (G19990 2 2 30 8)
重点实验室访问学者基金资助项目
