有芯热管对高温煤堆温度场的影响实验研究

Experiment research on the influence of cored heat pipe on temperature field of high temperature coal pile

为了研究有芯热管对煤堆温度场的影响特征与防治煤堆自燃的可行性,利用实验测试有芯、无芯2种热管在不同热源温度下煤堆内部的热量运移规律,并结合数值模拟分析有芯热管不同布置方式对大面积煤堆的移热效果。结果表明:在不同的热源温度下,有芯热管作用煤堆最大降温幅度为130.6 K,无芯热管作用煤堆最大降温幅度为118.6 K;热管对煤堆内部温度场的影响根据距离可划分为高效降温区、过渡区域、缓慢降温区3个区域;采用三角形管群布置,煤堆内部高温区域面积较小;管间间距为25 cm时具有最好的移热效果;相比于管群布置,管间间距对有芯热管的移热效果影响更大。

In order to study the influence characteristics of cored heat pipes on the temperature field of coal pile and the feasibility of preventing the spontaneous combustion of coal pile,the heat transfer law of two kinds of heat pipes with core and without core under different heat source temperature conditions was tested by experiments,and the heat transfer effect of different arrangement modes of cored heat pipes on large area coal pile was analyzed by numerical simulation.The results show that under different heat source temperature conditions,the maximum cooling range of cored heat pipe is 130.6 K,and the maximum cooling range of non-cored heat pipe is 118.6 K.The influence of heat pipes on the internal temperature field of coal pile can be divided into three regions according to the distance:high efficiency cooling zone,transition zone and slow cooling zone;the high temperature area inside the coal pile is smaller with triangular tube group arrangement;the best heat transfer effect is obtained when the spacing between tubes is 25 cm;compared with the tube group arrangement,the distance between tubes has more influence on the heat transfer effect of the core heat pipe.