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

Inactive Publication Date: 2014-03-26
陈善乐
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Problems solved by technology

For these problems, neither analytical calculation nor continuum theoretical simulation can give a good response to the development process of mesoscopic spontaneous combustion.

Method used

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  • Method for stimulating goaf ignition process under U-shaped ventilation
  • Method for stimulating goaf ignition process under U-shaped ventilation

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Experimental program
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Embodiment Construction

[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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Abstract

The invention discloses a method for stimulating a goaf ignition process under U-shaped ventilation. The method is characterized in that grain flow based PFC3D is used as a stimulation platform in consideration of a residual coal seam having a loose and porous structure caused by mining, and the loose and porous structure is in favor of a contact reaction of oxygen and coal in order to stimulate the temperature distribution and energy migration of the residual coal seam in a natural ignition process; extremely small grains are used to stimulate the flow of oxygen and the reaction of oxygen and coal, and the process is realized through FISH; and the method comprises the steps of residual coal seam model construction, stimulation of oxygen in the residual coal seam, and temperature field stimulation effect obtaining and analysis. The method is very suitable for the researches on the determination of the ignition process of the residual coal seam under normal propulsion under U-shaped ventilation.

Description

technical field [0001] The invention relates to mining engineering, in particular to the determination of the ignition characteristics and process of the remaining coal seam during normal propulsion under U-shaped ventilation. Background technique [0002] Mine spontaneous combustion disaster has long been one of the main factors that seriously threaten the safety of coal mine production. Many experts and scholars have conducted many studies on simulating the spontaneous combustion of residual coal, but spontaneous combustion accidents still occur frequently. In recent years, with the popularization of top-coal caving technology, the top-coal discharge rate at the end support is low, resulting in more coal left in the goaf, and the risk of spontaneous fire in the goaf is gradually increasing. About 56% of mines in China have potential spontaneous combustion, far more than other countries. However, 94% of the fires in my country's coal mines are caused by spontaneous combus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/22
Inventor 陈善乐汪华君崔铁军陈亮
Owner 陈善乐
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