Sinopec Greatwall Energy and Chemical Co.,Ltd.，Beijing ,China

In order to study the evolution law of temperature field during spontaneous combustion process of coal in gob of rhe working face, based on geometric similarity and the principle of coal spontaneous combustion, a similar simulation test device for the temperature field distribution in the gob was developed.After crushing the large lump coal samples collected on site, the mixed coal with particle size less than 30 mm were selected for filling. Heat sources and measuring points were set up to simulate the heat transfer process of coal spontaneous combustion in gob, and the distribution law of temperature field inside loose coal body, the effect of heat source temperature on the heat transfer law of loose coal body, and the distribution law of temperature field of Y-shaped ventilated gob were studied. The test results show that under the condition of no convection, the heat transfer from the heat source to the surrounding coal body is isotropic.With the increase of the heat source temperature, the heat transfer capacity of the heat source in the loose coal rapidly increases in a non-linear form, and increase rate is getting larger and larger. The relationship between the temperature of a measuring point around the constant temperature heat source and the distance and time of the constant temperature heat source is that, when the distance or time is less than the value of parabolic symmetry axis, it conforms to the quadratic function relationship, and when the value is greater than the value of parabolic symmetry axis, the temperature of the measuring point is basically stable. In the process of coal spontaneous combustion, the high temperature point in the spontaneous combustion process of coal will migrate to the oxygen enrichment area in an accelerated manner. Affected by the pressure and suction effect of the fire wind, the migration effect of the upper area of the fire source is more obvious.

0 引言
1 试验
1.1 松散煤体热传递方式
1.2 试验仪器
1.3 试验方法
2 松散煤体温度场分布规律
2.1 松散煤体内部温度场分布规律
2.2 松散煤体内部温度随时间变化关系
2.3 松散煤体温度与距热源距离的关系
3 热源温度对松散煤体热量传递规律的影响
4 Y型通风采空区松散煤体温度场分布规律
5 结论

刘振岭,郑忠亚.采空区煤体自燃温度场演变模拟试验研究[J].煤炭科学技术,2020,48(8):114-120.