含内热源非饱和松散煤体热质耦合仿真计算与试验

发布时间：2018-04-21 09:04

本文选题：煤自然发火 + 非饱合松散煤体　；参考：《煤炭科学技术》2017年12期

【摘要】：为研究含内热源非饱和松散煤体内的传热传质的基本规律,考虑了水分的蒸发和在热动力驱动下因速度和温度的变化引起的自然对流与热弥散效应,采用流体分析软件对建立的含内热源松散煤体热质耦合物理模型进行仿真计算,并对试验结果和仿真结果进行分析。结果表明:在含内热源的松散煤体内部,以热源为中心温度纵向呈椭圆形分布规律,即纵向温度变化比其在横向的变化要快,此现象随着内热源控制温度的不断增大而变得越来越显著,且所得的试验结果和Fluent模拟结果基本吻合。试验与模拟表明在平均粒径小于6 mm的含内热源的松散煤体中存在明显的自然对流和热弥散效应,松散煤体内部水分的蒸发和迁移对温度的分布有很大的影响。
[Abstract]:In order to study the basic rules of heat and mass transfer in unsaturated loose coal with internal heat source, the effects of water evaporation and natural convection and thermal dispersion caused by the change of velocity and temperature driven by thermal power are considered. The physical model of thermal and mass coupling of loose coal with internal heat source was simulated by using fluid analysis software, and the experimental results and simulation results were analyzed. The results show that in the loose coal body with internal heat source, the temperature of the inner heat source is elliptical, that is, the change of longitudinal temperature is faster than that of transverse temperature. This phenomenon becomes more and more obvious with the increasing of the internal heat source control temperature, and the experimental results are in good agreement with the Fluent simulation results. The experiment and simulation show that there are obvious natural convection and thermal dispersion effects in loose coal with average diameter less than 6 mm, and the evaporation and migration of water in loose coal have great influence on temperature distribution.
【作者单位】：安徽理工大学机械工程学院;
【基金】：国家自然科学基金资助项目(51574009) 中国博士后科学基金资助项目(2014M561807) 安徽省高校优秀青年人才支持计划重点资助项目(gxyq ZD2016087)
【分类号】：TD752.2

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