Goaf fire preventing and extinguishing method based on air flow distribution and dry ice phase change

By measuring the wind flow intersection between the goaf and the coal mining working surface, scientifically arrange the insulation box equipped with dry ice, solving the problems of large consumption and uneven distribution of fire-extinguishing materials in the existing goaf fire prevention and extinguishing methods, achieving efficient and uniform fire prevention and extinguishing effects, and reducing safety risks.

CN119664419AActive Publication Date: 2025-03-21CHINA COAL TECH & ENG GRP SHENYANG ENG CO +2
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Patent Information

Application Number
CN202411740041.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-29
Publication Date
2025-03-21
Estimated Expiration
2044-11-29

AI Technical Summary

Technical Problem

The existing fire-fighting methods in the goaf area have problems such as large consumption of fire-fighting materials, uneven distribution and difficult to evaluate the fire-fighting effect. Especially when there are air leakage channels and structural cracks, the fire-fighting effect is poor, and the injection of inert gas may lead to a decrease in oxygen concentration, endangering personnel safety.

Method used

Fire-fighting method based on airflow distribution and dry ice phase transformation is adopted. By measuring the wind flow intersection between the goaf and the coal mining working surface, an insulated box equipped with dry ice is scientifically arranged according to the airflow distribution in different sections. After the dry ice breaks, it sublimates to form CO2 gas to achieve uniform distribution and precise fire-fighting.

Benefits of technology

It improves the fire prevention and extinguishing effect, ensures the uniform distribution of CO2 gas after dry ice sublimation in the goaf area, reduces the consumption and cost of fire extinguishing materials, and avoids the risk of personnel suffocation, achieving the dual effect of inhibiting spontaneous combustion of coal.

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Abstract

The invention discloses a goaf fire preventing and extinguishing method based on wind flow distribution and dry ice phase change. The method comprises the following steps that the wind flow intersection condition of a goaf and a coal face is measured; detecting the influence range when the dry ice is sublimated into CO2 gas in a laboratory; putting dry ice in the goaf; during stoping, after the goaf roof collapses, the goaf roof coal rock falls onto the heat preservation box filled with the dry ice, the heat preservation box is broken, and the dry ice is buried by the goaf roof coal rock and sublimates to form CO2 gas which is diffused all around for fire prevention and extinguishment. According to the method, the heat preservation boxes filled with the dry ice are arranged in the direction parallel to the coal face and are divided into sections according to wind flow intersection in the goaf, and it is guaranteed that CO2 gas formed after sublimation of the dry ice is evenly distributed in the goaf to the maximum extent. The dry ice in the heat preservation box does not generate phase change when being located in a heat dissipation zone, and sublimates after being smashed by goaf roof coal rocks after falling down when being located in an oxidation zone where spontaneous combustion is most likely to happen, and accurate fire prevention and extinguishing are achieved.
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