Device for preventing coal from burning spontaneously and rapidly extinguishing under coal mine and working method thereof

Abstract

The invention discloses a device for preventing coal from burning spontaneously and rapidly extinguishing under a coal mine and a working method thereof. The device comprises a cylindrical foamed shell of which the two ends contract, wherein one end of the foamed shell is connected with a compressed air line; one side of the compressed air line is provided with a foam stock solution inlet; the other end of the foamed shell is connected with a foam output pipeline; 6-8 groups of spiral blades are arranged on a hollow shaft of an axis in the foamed shell at certain intervals; air outlet holes are formed among the spiral blades; included angles between the turning directions of the spiral blades and the axial direction of the hollow shaft are 45-60 degrees; each group of spiral blades has the same turning direction; and two adjacent groups of spiral blades have opposite turning directions. A mixture is foamed twice, so that the foaming times are raised to 50-150 times rapidly within a short period of time, and the aims of preventing and controlling spontaneous turning of coal and rapidly extinguishing are fulfilled.

Description

technical field [0001] The invention relates to a device for preventing and controlling coal spontaneous combustion and a rapid fire extinguishing device, especially for preventing and controlling coal spontaneous combustion and a rapid fire extinguishing device for underground coal mines Background technique [0002] Under certain conditions, coal left in goafs in coal mines is prone to spontaneous combustion fires, and the effective way to extinguish them is to spray gel foam. [0003] The currently used foam generators mainly include mesh foamers for firefighting, which consist of an air compressor, a pressure vessel, a foaming cylinder with a metal grid and gas-liquid pipelines. This kind of foamer requires an external power source , Not suitable for underground fire prevention and extinguishing operations in coal mines. [0004] Patent No. 02148411.2 "Three-phase foam generating device for preventing spontaneous combustion of coal" applied by China University of Mining...

AI Technical Summary

Problems solved by technology

This device relies on the mixture of yellow mud, fly ash and other foams to protect the coal, so as to achieve the effect of preventing coal spontaneous combustion. Its shortcomings: First, the three-phase foam produced by the mixture of yellow mud and fly ash Particles and particle size are not uniform, and cannot be used for fire extinguishing and cannot completely block the contact between air and coal; second, the foaming ratio is low, only about 30 times, which has a certain effect on preventing coal spontaneous combustion in underground coal mines, and cannot realize rapid fire extinguishing in coal mines The third is that this kind of foam generator should be equipped with a barrier plate in the mixer, the manufacturing process is complicated, and it is easy to produce stagnation.

Its disadvantages are: compared with the patent No. 02148411.2, the barrier plate in the mixer is replaced with a central shaft with a long barrier piece and a short barrier piece. Low

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