A kind of gas circulation utilization fire extinguishing system and control method in goaf

Abstract

The invention discloses an anti-extinguishing system and a control method for gas circulation utilization in a goaf, including a gas transmission pipeline, a gas return pipeline, a flame retardant system, a wind flow blocking system and a gas generating device. The gas transmission pipeline includes a gas transmission main pipe and a gas transmission pipe The air branch pipe and the air return pipeline include the suction main pipe and the vertical column branch pipe, in which the gas transmission main pipe and the suction main pipe are connected by a multi-section straight pipe through a three-way valve; the flame retardant system includes a flame retardant tank, a flame retardant pipeline, The water injection pipe and the injection head are connected with a number of injection heads parallel to the flame retardant pipeline; the air flow blocking system is composed of a hydraulic support and a coal gangue pile whose gaps are sealed by foam; the gas generating device includes nitrogen gas. Production unit, nitrogen work station and gas recovery unit, this part is placed in the roadway. The whole system has simple structure, coherent working process and high efficiency, which can greatly reduce the occurrence rate of spontaneous combustion fire in the goaf.

Description

technical field [0001] The invention relates to an anti-fire-extinguishing system suitable for preventing spontaneous combustion of goaf in underground coal mines. Background technique [0002] Spontaneous combustion in coal mines has always been one of the major disasters in coal mines in my country and even in the world. Spontaneous combustion in coal mines is extremely harmful and difficult to extinguish. It will not only cause huge waste of coal resources, but also cause damage to underground equipment, paralyze the underground system, and endanger the lives of underground workers. [0003] At present, nitrogen injection in goaf is one of the main measures to prevent spontaneous combustion in goaf in China. It is to send nitrogen into the oxidation zone of the goaf to remove the air in the fire zone and reduce the oxygen concentration, so as to suppress the oxidation zone. The effect of spontaneous combustion of internal coal. The most commonly used nitrogen injection ...

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Problems solved by technology

Due to the small area of ​​nitrogen injection in the traditional method, a single pipeline is used to inject nitrogen, and the diffusion of nitrogen gas is slow, so the oxygen concentration in the goaf cannot be quickly reduced, and when the working face is normally supplied with air, air will enter the goaf, increasing In addition, the traditional method also has the problem of low utilization rate of nitrogen

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