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Atmospheric pressure influence considered mine goaf temperature field simulation method

A simulation method and goaf technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of affecting the reliability of the judgment of spontaneous combustion hazard areas in goafs, not considering the boundary conditions of atmospheric pressure, and the simulation results are not accurate. Accuracy and other issues

Active Publication Date: 2015-09-23
CCTEG SHENYANG RES INST +1
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Problems solved by technology

[0006] The purpose of the present invention is to simulate the temperature field of the goaf according to the actual air flow and temperature changes, so as to solve the problem that the temperature field model of the gob in the prior art does not consider the boundary condition of atmospheric pressure, which makes the simulation result inaccurate and affects the mining area. Reliability Problems of Judgment of Spontaneous Combustion Hazardous Area in Empty Space

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  • Atmospheric pressure influence considered mine goaf temperature field simulation method
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  • Atmospheric pressure influence considered mine goaf temperature field simulation method

Examples

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Embodiment 1

[0053] see figure 1 , figure 2 , image 3 , a mine goaf temperature field simulation method considering the influence of atmospheric pressure, including the following steps: Step ① determine the goaf boundary, including the rectangular target goaf formed by the first boundary 1, the second boundary 2 and the third boundary 3 , determine the rectangular target goaf length L=500m value and the width W=300m value, determine the coordinate axes x (m), y (m), form the whole calculation area by the order of points, lines, and planes, and establish the goaf The size of the calculation domain is 500m*300m, and the interface length of each discrete unit is determined, that is, the grid unit is 0.5m, and the structured grid is used for discrete, and the map grid division method in Gambit is used to generate the following: figure 2 As shown in the grid, after the grid division is successful, Gambit will output the mesh file, so that it can be used in the identification and calculatio...

Embodiment 2

[0096] see figure 1 , figure 2 , Figure 4 , a mine goaf temperature field simulation method considering the influence of atmospheric pressure, including the following steps: Step ① determine the goaf boundary, including the rectangular target goaf formed by the first boundary 1, the second boundary 2 and the third boundary 3 , determine the rectangular target goaf length L=500m value and the width W=300m value, determine the coordinate axes x (m), y (m), form the whole calculation area by the order of points, lines, and planes, and establish the goaf The size of the calculation domain is 500m*300m, and the interface length of each discrete unit is determined, that is, the grid unit is 0.5m, and the structured grid is used for discrete, and the map grid division method in Gambit is used to generate the following: figure 2 As shown in the grid, after the grid division is successful, Gambit will output the mesh file, so that it can be used in the identification and calculati...

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Abstract

The invention relates to an atmospheric pressure influence considered mine goaf temperature field simulation method which is used for obtaining a total pressure value p<in> at an air inlet throat and a total pressure value p<out> at an air return throat. A set of simultaneous plane temperature field model equations is formed, and a wind pressure boundary condition equation and a thermodynamics boundary condition equation are added; a numerical solution is obtained in computational fluid dynamics software FLUENT to obtain a goaf temperature field simulation cloud atlas under certain ground atmospheric pressure; and a rule that if the atmospheric pressure is increased, the absolute pressure of air in the goaf is increased, the flow velocity is caused to decrease, and therefore low heat convection and conduction efficiency and small temperature distribution gradient is caused due to multi-field coupling is obtained, and the rule conforms to a practical situation of a mine. The method has the advantages of small error and high precision.

Description

technical field [0001] The invention relates to the technical field of spontaneous combustion fire prevention in coal mines, in particular to a simulation method for the temperature field of a mine goaf considering the influence of atmospheric pressure changes. Background technique [0002] Spontaneous combustion of coal is the main cause of spontaneous combustion in coal mines. The situation of spontaneous combustion in coal mines in my country is very serious, and about 56% of coal mines in the country have spontaneous combustion problems. How to judge the dangerous area of ​​coal spontaneous combustion is an important research topic of coal safety production. The importance of coal spontaneous combustion prediction as the first line of defense is self-evident. Coal spontaneous combustion mainly occurs in goafs. Therefore, coal spontaneous combustion in goafs is the focus of spontaneous combustion fire prevention in coal mines. How to accurately determine spontaneous combu...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 郝贵梁运涛张光德王刚周勇张占国田富超于贵生唐辉宋双林
Owner CCTEG SHENYANG RES INST
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