直接点火燃烧器煤粉二次混合冷态数值模拟  

Numerical Simulation of Pulverized Coal Mixing in the Second-stage of a Multi-stage Oil-less Ignition System

作　　者：张巍[1] 徐江荣[2] 周俊虎[1] 岑可法[1] 

机构地区：[1]浙江大学能源洁净利用与环境工程教育部重点实验室,浙江杭州310027 [2]杭州电子科技大学理学院,浙江杭州310018

出　　处：《锅炉技术》2005年第3期42-47,共6页Boiler Technology

摘　　要：为掌握直接点火燃烧器第二级部分内部流动特征,应用Fluent6.1.22软件对浙江大学热能工程研究所的两级直接点火燃烧器第二级部分的内部紊流气固两相流动进行了数值模拟,采用标准k-ε紊流模型和壁面函数法模拟气相流动,采用双向耦合拉格朗日法追踪颗粒运动轨迹。对连续相速度和湍流动能分布特征以及颗粒相运动轨迹进行了分析,得出了不同工况条件下煤粉的混合状况和煤粉颗粒在整个混合区域内的分布规律。此结果对于燃烧器的现场运行及其优化设计都有一定的指导作用。In order to recognize the flow characteristics in the second-stage of a multi-stage oil-less ignition system, Fluent 6.1.22 was employed to simulate the gas-solid two phase flow in the second-stage of a multi-stage oil-free ignition system originated by Institute for Thermal Power Engineering of Zhejiang University. The k-ε turbulent model and wall function were used to simulate the gas phase flow, the bidirectional coupling Lagrangian scheme was used to trace the particle movements. The continuous phase speed, the turbulent kinetic energy distribution characteristics, and the particle phase movements were analyzed, the mixing of pulverized coal in various working conditions and the particle concentration distribution in the second-stage were discussed.

关 键 词：直接点火燃烧器 气固两相流 数值模拟 

分 类 号：TK223.23[动力工程及工程热物理—动力机械及工程]