旋转闪蒸干燥设备的流体动力学分析

Hydrodynamics analysis of spin flash drying equipment

为探究旋转闪蒸干燥过程的流场特性及热质传递机理,应用计算流体动力学技术建立了此过程的CFD模型,模拟得到了干燥过程的速度场、温度场和压力场,分析了不同进风速度、温度、刀组转速对干燥性能的影响,并以碳酸钙为原料进行了试验验证.结果表明,干燥室内速度、温度及压力在近壁面区域均大于中心区域,随着高度增加总体呈衰减趋势,同时存在回流、漩涡等现象;不同进风速度、温度对压降影响明显,不同刀组转速对切向、径向速度有较大影响.

In order to explore the flow field characteristics and heat mass transfer mechanism of spin flash drying process, the CFD model of this process was established by computational fluid dynamics. The velocity field, temperature field and pressure field of the drying process were simulated. The effects of different inlet velocity,temperature and blade speed on the dr ying performance were analyzed, and the test was carried out with calcium carbonate as the raw material. The results show that the velocity, temperature and pressure in the drying chamber are all larger than the central area in the near wall area. As the height increases,the overall attenuation trend is present. At the same time, there is a phenomenon of reflux and whirlpool. The influence of different inlet velocity and temperature on pressure drop is obvi ous,and the speed of different blades has a great influence on tangential and radial velocity.