含高温热源的储煤筒仓温度场实验研究

Experimental research on temperature field of coal storage silo containing high temperature heat source

为了解决储煤筒仓因煤体发生自燃而引发事故的难题,采用实验研究的方法,搭建储煤筒仓实验台,利用人工热源模拟自燃高温热源,对松散煤体温度场进行研究,分析不同测点距离、热源强度和热源相对位置对温度场的影响。结果表明:储煤筒仓内松散煤体温度场与热源强度、时间、距离等多种因素相关,其中,受热源强度影响更加明显;当热源温度低于150℃时,对流影响区域远小于导热影响区域;当热源温度高于200℃时,导热因素对温度场的影响占主要地位;对比筒仓壁面同层以及同列温度测点之间的温度变化趋势,可以推出高温热源的位置并监测筒仓储煤温度场,有利于预防储煤自燃。

In order to solve the problem that the coal’s spontaneous combustion causes accidents in storage silos, this paper adopts experimental research method, and builds an experimental table of coal storage silo. It utilizes the artificial heat source to simulate high temperature heat source of spontaneous combustion to test the temperature field of the loose coal body, and analyze the influence of the distance of testing points, the intensity and the relative location of heat source on temperature field. The results show that temperature field of the loose coal body in silo is related to many factors, such as heat source strength, time and distance etc, and the influence of heat source intensity is more obvious. When heat source temperature is lower than 150 ℃, the convection influence area is much smaller than the heat conduction influence area. As heat source temperature is higher than 200 ℃, the effect of conduction factors on temperature field is dominant. Comparing the temperature change trend of testing points between the same layer and column on the wall of silo, it can determine the heat source location of high temperature and monitor the temperature field of storage silo, which is beneficial to prevent coal’s spontaneous combustion.