摘要
采用计算流体动力学软件对电站锅炉炉内实际燃烧过程进行数值计算并结合其热态试验数据进行对比分析,已成为验证数学模型和指导工程实践的一种重要研究手段。该文利用PHOENICS软件,采用IPSA两相流模型及煤粉燃烧综合模型,对一台有16只径向浓淡旋流燃烧器两侧墙对冲布置的200MW燃煤锅炉炉内燃烧过程进行了数值计算,得出了炉内燃烧器区域以及炉膛出口的烟气温度场和燃烧产物的组分浓度分布。模拟结果与锅炉热态试验数据进行了比较,两者吻合情况较好。结果表明:在燃烧器出口处形成了高煤粉浓度和高温区,使得煤粉着火及时,燃烧器区域维持较高温度,炉内煤粉燃烧充分,从而表明了径向浓淡旋流燃烧器具有高效稳燃的性能。
The comparative study between CFD numerical results of pulverized coal combustion process and theexperimental data acquired in actual combustion process isbecoming an important measure for validating mathematicalmodels and direct engineering practice. It is presented in this paper that a swirling combustion process in a 200MWpulverized coal fired boiler with 16 radial bias combustion(RBC) swirl burners is numerically calculated by using thePHOENICS CFD codes. The Inter-phase Slip Algorithm model is employed for the two-phase flow simulation and thecomprehensive coal combustion models are used to simulate the combustion process in a furnace. The numerical resultsshow the temperature field and the concentration distributions of the combustion species in the combustion zone and at exit of the furnace. The comparison between the simulation and the measurement of hot test show a good coincidence. The results illustrate that a high pulverized coal concentration and hightemperature zone is formed at the outlet of RBC swirl burners which makes pulverized coal ignition more favorable. The gas temperature at the burner region is high enough to guarantee the pulverized coal fired rapidly and completely. ThereforeRBC swirl burners have the advantages such as highcombustion efficiency and good flame stability.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2003年第8期215-220,共6页
Proceedings of the CSEE
