喷雾干燥塔内两相流动特性的数值模拟研究  

NUMERICAL SIMULATION OF TWO-PHASE FLOW CHARACTERISTICS IN SPRAY DRYING TOWER

作　　者：臧仁德[1] 

机构地区：[1]重庆理工大学汽车学院,重庆400050

出　　处：《热力发电》2012年第11期12-16,共5页Thermal Power Generation

摘　　要：通过在喷雾干燥塔内加装均流板,优化塔内烟气与浆滴两相流动特性。利用Fluent软件包及RNGk-ε和Navier-Stokes方程,对优化后塔内的两相流动特性进行数值模拟。结果表明,干燥塔轴线位置烟气的平均速度最大,喷嘴位置及其两侧温度变化大;当入口烟气流速为4m/s时,塔内温度梯度变化最大,浆滴在塔内的充满度最高;随着均流板开孔区域直径的增加,塔内阻力逐渐减小,浆滴粘壁率先增加再减小。To optimize the two-phase flow characteristics of flue gas and slurry droplets in spray drying tower,an equalizing plate was installed inside the tower.The Fluent software package,turbulence model and the stochastic model of droplet track were adopted in numerical simulation.Results showed that,the average speed of flue gas along the tower axis was the greatest;the temperature variation in the vicinity of spray nozzle was the largest;when the inlet flue gas speed v was 4 m/s,the temperature gradient variation inside the tower was the maximum,and the slurry droplets full filled the tower;with an increase in the diameter of hole area on equalizing plate,the resistance in tower was gradually decreased,and the viscosity to the wall of slurry droplets first increased and then reduced.

关 键 词：喷雾 干燥塔 均流板 两相流动 浆滴 烟气流速 

分 类 号：X701[环境科学与工程—环境工程]