松散煤体导热系数的温度及粒度效应

发布时间：2018-03-18 17:36

本文选题：导热系数　切入点：松散煤体　出处：《中国安全生产科学技术》2015年02期 　论文类型：期刊论文

【摘要】：松散煤体导热系数受诸多因素影响,但对于同一煤体,其导热系数主要与温度、粒度有关。通过建立松散煤体的热传导模型,对导热系数采用二分法逐步逼近,数值模拟不同环境温度、不同粒度煤体传热过程的温度变化规律,并与实测结果对比分析,进而确定与实测规律吻合最好时的煤的导热系数。研究结果表明:采用二分法逐步逼近取得煤样导热系数的模拟结果可无限接近实测结果,进而确定煤的导热系数是切实可行的。在不同的环境温度下,煤的传热过程温度变化规律差异较大,同一粒度煤样,其导热系数值随环境温度升高而线性增大。同一环境温度下,粒度较小时对导热系数影响较大,而粒度较大时对导热系数影响较小。该方法也可用于其它同类型材料的导热系数测定,具有一定的实用价值。
[Abstract]:The thermal conductivity of loose coal body is affected by many factors, but for the same coal body, its thermal conductivity is mainly related to temperature and particle size. By establishing the heat conduction model of loose coal body, the thermal conductivity coefficient is approached step by step by dichotomy. The temperature variation law of different ambient temperature and different particle size coal body heat transfer process is simulated numerically, and the results are compared with the measured results. The results show that the thermal conductivity of coal samples obtained by the dichotomy approach is infinitely close to the measured results. Furthermore, it is feasible to determine the thermal conductivity of coal. Under different ambient temperatures, the variation of the temperature in the process of heat transfer of coal varies greatly, and the coal sample of the same size is obtained. The thermal conductivity increases linearly with the increase of ambient temperature. The method can also be used to determine the thermal conductivity of other materials of the same type, which has certain practical value.
【作者单位】：河南理工大学安全科学与工程学院;
【基金】：国家自然科学基金资助项目(51274090) 河南省科技攻关计划项目(142102310268) 中国博士后科学基金项目(2013M531673) 河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地开放课题项目(WS2012B01)
【分类号】：TD752

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