| The hidden heat place detection of coal mine has been a problem which obsesses china's prevention and control of spontaneous combustion of coal. Using infrared thermography to detect and analysis the change and influence of temperature field of heat reservoir loose coal qualitatively and quantitative, realizing and mastering heat transfer regularity of it has important application value.This paper studied the temperature field of the heat reservoir loose coal using finite element method analysis theory, experimental study and computer simulation. First of all, design and put up experimental table of heat reservoir loose coal. In the experiment, using a linear heating stick as inner heat reservoir, using infrared thermography to get surface infrared images, analysis surface temperature field and it's change. The experiment reflect the change of whole surface temperature field preferably. From the images the position of heat reservoir can be roughly found. It showed that infrared thermography has many advantages in hidden fire detection of coal mines. The paper proposed judging the time length of heat reservoir existence with change rate of temperature.Then, set up a physical model of loose coal with inner heat reservoir, using Fluent to simulate, compare the simulation result and experimental simulate, verify effectiveness of the model. It proved the model reflect the change of whole surface temperature field preferably. The physical parameters has been changed in the model to analysis the influence of heat conductivity and heat depth. It can be concluded that the mainly influence of loose coal heat conductivity was surface temperature field and developing rate of heat reservoir, the influence of inner temperature field is little. The influence of loose heat depth was surface temperature field, inner temperature field and developing rate of heat reservoir. Small heat conductivity and big heat depth was the favorable conditions of heat reservoir development.
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