Underground liquid nitrogen direct injection type fire preventing and extinguishing device

Abstract

The invention discloses an underground liquid nitrogen direct injection type fire preventing and extinguishing device. The upper end of a liquid nitrogen tank of the device is connected with a liquid inlet control valve, a buffering tank is connected with the upper end of the liquid nitrogen tank via a buffering tank nitrogen outlet control valve, an upper one-way valve, a nitrogen return pipe and a liquid nitrogen tank nitrogen inlet control valve sequentially, the lower end of the liquid nitrogen tank is connected with the lower end of the buffering tank via a liquid nitrogen tank liquid outlet control valve, a lower one-way valve, a heat-insulation tube and a buffering tank liquid inlet control valve sequentially, and the lower end of the buffering tank is connected with a drilling tube via a hopper-shaped gathering opening and a buffering tank liquid outlet control valve. By the aid of the device, fire extinguishing efficiency can be improved by 30% at least, fire district treatment time is shortened by 20% at least, the device can be dragged by a mine underground rail vehicle to reach a closed wall to movably extinguish fire, and accordingly the underground liquid nitrogen direct injection type fire preventing and extinguishing device is flexible, convenient, safe and environment-friendly, is rapid in fire extinguishment, and is particularly applicable to high-efficiently preventing and controlling coal seam spontaneous fire hazards.

Description

technical field [0001] The invention relates to a liquid nitrogen direct injection type fire prevention and extinguishing device under a coal mine. Background technique [0002] During mine fire disasters, due to the depth of the mine, the lack of ground drilling conditions for liquid nitrogen injection, or the high cost of ground drilling, mines often use underground direct injection liquid nitrogen fire prevention and extinguishing technology. The liquid nitrogen underground direct injection fire extinguishing device is mainly transported to the underground through the trackless rubber wheeled liquid nitrogen tanker or the liquid nitrogen sub-package tank, and directly injected into the borehole through the pipeline, but during the nitrogen injection process, with the storage tank device With the reduction of internal liquid nitrogen, the power of liquid nitrogen injection is insufficient, and part of the liquid nitrogen is vaporized in the nitrogen injection pipeline, whi...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects of the existing trackless rubber-wheeled liquid nitrogen tanker or liquid nitrogen sub-package tank that the liquid nitrogen vaporizes in the nitrogen injection pipeline, which will cause air lock and affect the liquid nitrogen perfusion efficiency, the present invention provides a liquid nitrogen Downhole direct injection fire extinguishing device, which has high fire extinguishing efficiency and can realize high-efficiency prevention and control of coal seam spontaneous combustion fire

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