Research On Abnormal Values Analysis Of Radon Measurement In Coal Spontaneous Combustion

Although coal industry has developed so much with opening and reformation, there are still problems of great waste of resource and poor environmental control, especially frequent safety accidents. Fire disaster is one of the major hazards in coal mines, which brings great effect and economic loss to coal mines production because 56% of coal mines are prone to combust spontaneously in China. The detection of fire area can forecast early fire in coal mines and give beneficial references to safety management in fire area as well as rescue after accidents. However, the spontaneous combustion fire of coal usually takes place in hundreds meters deep covered underground, and people can not get close, so the accurate detection of spontaneous combustion fire position becomes the key technique of fire prevention as a worldwide problem.The paper researched on analyzing abnormal value of radon measurement in fire detection based on Isotopic Radon Measurement Technique to make clear position of coal spontaneous combustion. Firstly, it discussed mechanism of radon transition in solid medium. The radioelement radon and its children or matrix disintegrated and complex cluster formed, this was the reason of radon up-moving. So conclusion was drawn that movable radon moved up to earth surface through small openings and tiny crannies by mechanism of diffusion, seepage, dissolution and evaporation, etc.. Secondly, all kinds of interfering factors should be reduced or eliminated to get better application effects in coal fire detection because of weak radon information formed in surface layer soil. Then it analyzed reasons of radon measurement abnormal values and its exclusion methods during covered coal fire detection process. At last, using abnormal value analysis of radon measurement in fire detection as an application example in Shanxi province Dongshan coal mine, it detected coal spontaneous combustion successfully which has great significance to protect safety production in coal mines. This research gave great references to coal spontaneous combustion fire control and detection.