Research Of Spontaneous Combustion Danger Zone Partition Of Gob Of Fully Mechanized Caving Face In High Ground Temperature Coalmine

Coal is among the most important energy resources around the world, and sustainable conservation of the coal resources becomes increasingly important. Consequently, the mine on better geologic condition and with low strata has nearly been ended, which lead to the inevitably tendency of deep exploit. Along with mine pit depth's increase, the deep mining and superficial part mining had the very big difference. And the geostatic pressure and ground temperature enlargement, matches the amount of wind to increase, creates increases to the mined out area leaking out quantity, the mined out area penetration coefficient and the leaking out area correspondingly has also changed, coal spontaneous combustion danger zones distribution rule along with it change. The coal bed spontaneous combustion's risk increased, enables the fire to have the rise tendency. Therefore, it is very necessary to research the partition of spontaneous combustion danger zone in gob of fully mechanized caving face in high ground temperature coalmine.In this article, the 1301N working face in Longgu coal mine of Shandong province was taken as example; methods of experiment, field observation and numerical simulation were combined to study the law of loose coal spontaneous combustion. Firstly, by making the use of large experiment device of coal spontaneous combustion, experiment the property parameter of coal self-ignition, and provide basic data for setting–up of forcast model of the golf and it numerical analogue for ventilation leakage condition of the gob of fully mechanized caving face in deep and high ground temperature coalmine. Secondly, on-the-spot observe face of the 1301N working face, with the property parameter of coal self-ignition, boundary of self-heating zone is partitioned, and got the safe advancing. Thirdly, the distribution of rock pressure, porosity, leakage channels and permeability of the gob were studied through theoretical analysis and flied observation. Then a mathematical model of Seepage and air species concentration was built and simplified using the theory of heat and mass transfer in porous media. After that, distribution of oxygen concentration and the velocity of air flow in the gob were calculated by simulating the flow field using fluent software numerically. Then, with the result of simulation, contrast with the coal spontaneous combustion dangerous zones which partitioned from the observation of the workface, and its results are identical on the whole with on-the-spot of reality. Proved the model validity and eradicates the guiding sense of the control of spontaneous combustion in mined out area. Meanwhile has studied the change of oxygen concentration, the gas seepage velocity, the pressure of mined out area in different amount of wind, then studied the change of self-heating zone.