中文摘要：

针对气流干燥纯碱干燥效率低的问题,应用Fluent流体软件结合气固两相流的理论知识对U型干燥管内的流场进行数值仿真,研究U型管道内两相流的速度、压力、温度流场的变化规律以及在不同气流入口速度条件下纯碱颗粒湿度的变化。结果表明：热空气温度越高,气固两相间的传热速率越大,在保证纯碱颗粒不分解的情况下入口热空气可尽量选择较高温度;热空气的入口速度的改变对干燥效率基本没影响甚至降低干燥效率;增大气固两相流之间的相对速度,可以更好地发挥管道加速段的作用来提高U型干燥管的干燥能力。所得结论为工业生产中纯碱干燥效率的提高提供了非常重要的理论依据。

英文摘要：

For low drying efficiency of air drying sodium carbonate,this paper uses the Fluent Software and the theory of the gas solid two phase flow to numerical simulation of the U-shape drying tube flow field,and studies the two phase flow velocity,pressure,temperature variation in the U-shape pipe and Sodium carbonate particles＇ humidity changes at different inlet velocity airflow conditions. The results show： The higher air temperature is,the greater the rate of heat transfer between the gas-solid becomes,hot air inlet can try to choose a higher temperature Ensuring carbonate particles do not decompose; The changs of hot air inlet velocity have no effect on the drying efficiency and even reduce the drying efficiency; Increasing the relative velocity between the gas solid flow can better play the role of pipeline acceleration to improve the U-type drying capacity.