Method for stimulating goaf ignition process under U-shaped ventilation
A simulation method and process simulation technology, applied in the field of mining engineering, can solve the problem of non-spontaneous development process reaction and so on
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[0042] In a mine, the 18305 mining face is 200 m long and 4.8 m high. Taking this working face as an example, the numerical simulation of goaf spontaneous combustion under U-shaped ventilation is carried out. The depth of the goaf is taken as 300m, the normal advancing speed of the working face is about 3.6 m / d, the ventilation resistance is 58 Pa, the inclination angle is 5°, and the maximum air volume of the working face is 700~810m 3 / min, the inlet air temperature is 19°C, the original rock temperature is 21.7°C, and the average thickness of residual coal is 0.4 m during normal advance. model such as figure 1 shown. The origin of the model is the gob (point O) in the lower left corner, the X-axis direction is from left to right (horizontal), and the Y-axis direction is from bottom to top (vertical).
[0043] Using PFC3D to simulate oxygen in the remaining coal seam, three problems need to be solved: 1) the oxygen in the air is equivalent to particles in proportion, 2) ...
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