| The spontaneous combustion of coal always occurs deep under the ground, so people cannot come close. Furthermore, the hidden fire source makes the accurate detection become thekey of Fire Prevention, which is also a global problem. With the rapid development ofinfrared technology, the detection of hidden fire source with infrared technology has become ahot issue. Using infrared thermograph to detect and analysis the change and influence oftemperature field of heat reservoir loose coal qualitatively and quantitative, realizing andmastering heat transfer regularity of it has important application value.This paper studied the temperature field of the heat reservoir loose coal using theoreticalanalysis, experimental study and computer simulation. An experimental setup of heatreservoir loose coal was established to study the difference of 400℃linear heat source,pointheat source, surface heat and 300℃,400℃,500℃surface heat。Infrared thermographs ofThermoProTMTP8 were used to get surface infrared images. Using the software of infraredcamera, the surface thermal field and the radiation characteristics of 400℃linear heatsource,point heat source, surface heat and 300℃,400℃,500℃surface heat were studied. Theexperiment comprehensively reflected the surface thermal field and the radiationcharacteristics of different heating temperature and shape. Using infrared technology, thelocation and shape of the heat source can be roughly determined. Under the same heattemperature, the surface temperature of surface heat was the highest, followed by that of lineheat source, then the point source. Under the same heat shape, the surface temperature riseswith the inner heat source. A physical model of loose coal with inner heat reservoir usingFluent was set up to simulate heat transfer process. The model can reflect the temperaturevariation of loose coal. Study on thermal conductivity of loose coal through changingparameters concluded that the impact of thermal conductivity was mainly on the surface temperature field and rate heat transfer. |
