Study On Electromagnetic Radiation Heating Of Coal In The Process Of Acoustic Emission

Our mine fire is very serious, life-threatening the safety of the miners, wasting a lot of coal resources, and therefore predict more obvious each mine fire prevention. How can locate the source of fire occurrence and location of effective fire detection remains a problem in urgent need of further research. Geophysical method in coal power disaster has been widely used, and therefore examine whether changes of acoustic emission and electromagnetic radiation exists coal heating process, the fire detection is of great significance.In this thesis, deformation and failure of coal heating systems acoustic-electric effect experiment tested different samples (coal, rock-like) sound rupture when heated emission of electromagnetic radiation signals:A comparative analysis of coal samples during heating and electromagnetic acoustic emission radiated signal characteristics laws; studied coal samples emit sound at different frequencies, the signal variation of electromagnetic radiation, electromagnetic radiation at different locations to test the variation of the same frequency.Research shows that coal samples, rock samples in the heating up process will produce reduced acoustic emission signals and electromagnetic radiation, acoustic coal in heating up the whole process increases arising after the first launch, electromagnetic radiation signal with the temperature the rise is increasing, as the temperature decreases the signal strength is also reduced, and temperature trends are basically the same; coal acoustic emission, electromagnetic radiation and coal pore structure and crack have a close relationship, but also with coal samples at different stages of combustion are closely related, with a clear distribution phase; different frequencies of electromagnetic radiation received by the antenna signal has a substantially uniform, but there are differences; different spatial positions are the presence of electromagnetic radiation signals, as the distance increases, interference increases.According to the above features, you can accurately predict the location of fire hazards and fires, coal fires for safety significance.