Abstract

In this paper, the flying heat transfer characteristics of slag particles are studied in the process of the dry centrifugal granulation. When the solidification time of particle surface decreased by 66.67% at the rotational speed of 800 rpm, the total solidification time on the particle surface decreased by 55.5% and the average cooling rate increases faster in the phase transition region; When the rotating speed is increased by 87.5%, the complete solidification time on the surface of particles with different particle sizes is shortened by about 6%, and the average cooling rate is increased in the transformation region. Compared with particle size, it has little effect on heat transfer; When the air outlet angle is increased from 30° to 90°, the solidification time of particle surface increases from 0.095 s to 0.1 s; The decrease of space temperature has a great influence on shortening the time of liquid phase existence and particle solidification process. The obtained results could provide a reference for the design of granulation equipment and the adjustment and control of various parameters in the operation process in the industrial application process.

摘要

本文研究了干法离心造粒过程中渣颗粒的飞扬传热特性。当转速为800 rpm时，颗粒表面凝固时间减少66.67%，相变区颗粒表面总凝固时间减少55.5%，平均冷却速度增加较快；当转速提高87.5%时，不同粒径颗粒表面的完全凝固时间缩短约6%，相变区的平均冷却速度提高。与粒径相比，对传热影响不大；当出风角由30°增加到90°时，颗粒表面凝固时间由0.095 s增加到0.1 s；空间温度的降低对缩短液相存在时间和颗粒凝固过程有很大的影响。所得结果可为工业应用过程中制粒设备的设计和运行过程中各种参数的调节控制提供参考。