• CN:11-2187/TH
  • ISSN:0577-6686

›› 2014, Vol. 50 ›› Issue (24): 152-157.doi: 10.3901/JME.2014.24.152

• 论文 • 上一篇    下一篇

篦冷机的渗流传热模型与数值模拟

王美琪;刘 彬;闻 岩;刘浩然   

  1. 燕山大学信息科学与工程学院 燕山大学河北省特种光纤与光纤传感重点实验室 燕山大学机械工程学院
  • 出版日期:2014-12-20 发布日期:2014-12-20

Seepage Heat Transfer Model and Numerical Simulation of Grate Cooler

WANG Meiqi; LIU Bin; WEN Yan; LIU Haoran   

  • Online:2014-12-20 Published:2014-12-20

摘要: 针对水泥篦冷机内熟料堆积体的多孔介质特性,应用非热平衡理论并结合Forchheimer-Brinkman-Darcy扩展模型,建立篦冷机的渗流换热模型。采用此模型对篦冷机内水泥熟料的冷却过程进行数值模拟,获得了不同供风风速、不同篦速下的气体和熟料层温度的变化规律。研究结果表明,所建模型可以较为准确地反映水泥熟料堆积体的冷却过程;供风风速的增加虽有利于熟料颗粒的冷却,但会降低回收风的温度,不利于热量的回收,合理的供风风速区间为1.5~2.0 m/s;在产量不变的情况下,增加篦速可强化熟料的前端骤冷效果,有利于形成高品质熟料,但是过高的篦速会使篦冷机前端的气体温度偏低,不利于水泥熟料的烧成;在料层厚度不变的情况下,增加篦速,回收风温与出料温度升高,但篦速过高时出料温度偏高;综合考虑产量不变与厚度不变这两种情况下篦速对熟料冷却过程的影响,得出合理的篦速区间为0.006~0.008 m/s。

关键词: 多孔介质, 非热平衡, 数值模拟, 水泥熟料

Abstract: Based on the porous media characteristics of cement clinker accumulation body in grate cooler, a seepage heat transfer model of grate cooler is established with the thermal non-equilibrium theory and the Forchheimer-Brinkman-Darcy extended model. The model is utilized to make the numerical simulation of the cooling process of cement clinker in grate cooler and then the temperature variation of air and clinker can be achieved in different wind speed and different grate speed. The results show that the established model can reflect the cooling process of cement clinker accumulation body more accurately. The increase of wind speed is conducive to the cooling of clinker, but it will lower the wind temperature of the recovery. The reasonable range of wind speed is 1.5-2.0 m/s. Secondly, the increase of grate speed can strengthen the front quenching in the case of a fixed yield, which is good to formatting high-quality clinker. But the gas temperature in the front of grate cooler will decrease if the grate speed is too fast. In this way, the sintering of cement clinker is not very well. In the case of a fixed bed depth, the increase of grate speed can improve the recovery wind temperature and the discharging temperature. The discharging temperature is on the high side when the grate speed is too high. By comprehensive consideration of the influence of grate speed on the cooling process under the fixed yield and the fixed bed depth, the reasonable range of grate speed is 0.006-0.008 m/s.

Key words: cement clinker, non-equilibrium, numerical simulation, porous media

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