内嵌锥筒连续式多晶硅固渣干燥机的流动行为

发布时间：2018-02-11 18:15

本文关键词： 锥筒螺带连续干燥机多晶硅　出处：《化学工程》2017年01期 　论文类型：期刊论文

【摘要】：设计了一种新型的内嵌锥筒且有内外2层螺带的连续式多晶硅固渣干燥机,通过对干燥机的流场进行Fluent模拟和实验验证,分析了示踪粒子的停留时间和示踪粒子在外筒的移动轨迹,以及干燥机的流场,得出如下结论:对流场进行模拟的方法是正确的,且在模拟粒子轨迹时用的DPM模型和嵌入的UDF源代码也是可靠的。示踪粒子在锥筒内的停留时间大约是在外筒的15.8%—25.4%,相对于传统连续式干燥机延长了停留时间。锥筒、辐杆、螺带组成的旋转结构可以带动物料运动:其一是向出口处流动;其二绕壁面旋转,形成漩涡,强化传热,且转速越快,强化程度越高。出口速度对流场结构的影响很小,只影响物料的处理量:速度越大,物料在筒内的停留时间越短,干燥程度越低。
[Abstract]:A new type of continuous polysilicon solid slag dryer with inner and outer two layers of spiral belt is designed. The flow field of the dryer is simulated by Fluent and verified by experiments. The residence time of tracer particles, the moving track of tracer outer cylinder and the flow field of dryer are analyzed. The conclusion is as follows: the method of simulating the flow field is correct. The DPM model and the embedded UDF source code used in the simulation of particle trajectories are also reliable. The residence time of tracer particles in the cone is about 15.8-25.4in the outer cylinder, which extends the residence time compared with the traditional continuous dryer. The rotating structure of the snail belt can drive the material movement: first, it flows to the outlet; secondly, it rotates around the wall to form a whirlpool to enhance the heat transfer, and the faster the rotation speed, the higher the strengthening degree. The flow field structure of the exit velocity has little effect on the flow field structure. Only affect the processing capacity: the greater the speed, the shorter the residence time of the material in the cylinder, the lower the drying degree.
【作者单位】：天津大学化工学院;中建安装工程有限公司;
【分类号】：TQ127.2;TQ051.892

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