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Method for simulating spontaneous combustion of coal stacks

A coal pile and spontaneous combustion technology, applied in the direction of material thermal development, can solve the problems of inability to simulate oxygen diffusion process, inability to simulate temperature and energy point-to-surface contact form transfer, oxidation reaction control and simulation difficulties, etc.

Inactive Publication Date: 2015-05-20
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is impossible to simulate the diffusion process of oxygen in the coal pile, the process of temperature and energy transfer in the form of point-to-surface contact, and it is also difficult to control and simulate the oxidation reaction

Method used

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  • Method for simulating spontaneous combustion of coal stacks
  • Method for simulating spontaneous combustion of coal stacks
  • Method for simulating spontaneous combustion of coal stacks

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Embodiment Construction

[0031] In order to better illustrate the construction of the coal pile spontaneous combustion model, the working conditions of an example coal pile are explained first. This example is a coal pile of a factory, which needs to use a large amount of coal in the production process, and the coal pile is large in volume. In order to avoid the possible spontaneous combustion accident caused by the long-term stacking of coal piles, our institute was commissioned by the factory to analyze the spontaneous combustion process of the coal pile and its preventive measures. PFC3D is especially suitable for this coal pile analysis. According to the information provided by the manufacturer and the relevant parameters obtained from the field survey: the height of the top surface of the coal pile from the ground (slope height) is 10m, the horizontal length of the pile top is 8m, and the horizontal length of the pile bottom is 20.5m. Due to hardware limitations and analysis requirements, the wi...

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Abstract

The invention discloses a method for simulating the spontaneous combustion of coal stacks. The method is characterized by comprising the following steps: based on the particle characteristics of the coal stacks, establishing a coal stack spontaneous combustion model by using PFC3D as a simulation, and simulating the spontaneous combustion oxidiation of the coal stacks and the temperature field change and energy migration during the process by using a thermal coupling model; simulating the flowing of oxygen and reaction of the oxygen and coal by using small particles, and achieving the process through FISH. The method comprises the following steps: establishing a coal stack model and an oxygen flowing model, and analyzing a temperature field and a flow field. The method can be used for analyzing the spontaneous combustion process of the certain scale coal stacks.

Description

technical field [0001] The present invention relates to coal engineering, especially involving Process analysis of spontaneous combustion caused by chemical reaction caused by long-term stacking of coal. Background technique [0002] The reason for spontaneous combustion of coal piles is that the coal particles inside the coal piles oxidize with the oxygen in the air due to their large specific surface area, releasing heat. When the released heat is greater than the heat emitted to the external environment, the coal piles begin to store heat and heat up; but At the beginning, the temperature of the coal pile rises slowly. When the temperature reaches a certain level, the temperature of the coal pile rises rapidly, and finally the coal pile begins to spontaneously combust. Due to the interaction between the external environment of the coal pile and the porous medium of the coal pile and the complexity of the coal oxidation reaction, the factors affecting the spontan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/22
Inventor 崔铁军赫飞赵东洋吴作启冯亚林孔晶
Owner LIAONING TECHNICAL UNIVERSITY
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