多管回转式煤调湿工艺模拟与分析

Simulation and Analysis of Rotary Tube Coal Moisture Control Technology

基于Fluent软件,采用欧拉多相流模型,模拟回转管内烟气(焦炉烟气)与干燥器内煤粉的流场分布、湿度和温度变化情况.结果表明,烟气速度在入口处最大,为9.65 m/s,在回转管内最小,为3.22 m/s,烟气经转弯处汇集于中心管,速度约为6～7 m/s;靠近回转管的煤粉速度最大,远离回转管的煤粉速度最小;煤粉与水分离后,水分比例减少,煤粉比例增加,脱水率约为7%;由干燥器周边到中心煤粉密度减弱;烟气和煤粉均有温度梯度,烟气温度差约为65 K,煤粉温度差约为31 K.

Based on Fluent simulation software, the model of Euler multi-phase flow was adopted to simulate the flow field distribution, humidity and temperature variation of flue gas（coke oven gas） and coal in a rotary tube dryer. The results showed that the maximum velocity of flue gas is 9.65 m/s at the entrance, the minimum velocity of flue gas is 3.22 m/s in the rotary pipe, flue gas gathers in the center pipe by turning on pipe bend with the velocity of about 6～7 m/s, the maximum velocity of coal appears near the rotary pipe, and the minimum velocity of coal far away from the rotary pipe. After separation of coal with water, coal content increases, under normal circumstances, the dehydration rate can reach about 7%. The distribution of pulverized coal form the peripheral to central part in the dryer becomes dilute. The gas and coal have temperature gradient distributions, the temperature difference of flue gas is about 65 K, and that of pulverized coal about 31 K.