A gel foam for coal seam fire control

Abstract

The invention discloses a gel foam for coal seam fire control, wherein the gel foam comprises 1.5%-0.7% of foaming agent, 1%-0.4% of synthetic super absorbent foam stabilizer and the balance of water by weight percentage. Compared with the traditional water slurry and gel, the gel foam is wider in coverage and can be piled up in the vertical direction quickly; the gel foam is capable of bringing more water and solid incombustible matters into a fire preventing and extinguishing region; as a result, the foam intensity is enhanced and the fire preventing and extinguishing efficiency is greatly improved; the foaming agent is formed by compounding surfactants such as an alkyl glycoside and an alkane sulfonate; the synthetic super absorbent resin is good in salt resistance; the gel foam is also obviously improved in water absorption capability in contrast with other gel foam; besides, the time taken to separate out 50 ml of water by standing the gel foam ranges from 4 to 5 hours; the time of the half foam life period is more than 18 hours; the stability of the foam and the persistence of foam plugging are improved; and moreover, the gel foam can be piled up in the vertical direction and is capable of achieving the prevention and treatment effects on high-position and medium-position coal.

Description

technical field [0001] The invention relates to the application field of underground coal mine fire prevention and extinguishing technology, in particular to a gel foam used for coal seam fire control. Background technique [0002] Spontaneous combustion of coal is a natural phenomenon that exists objectively, and the heat released by the recombination of coal and oxygen is the root cause of spontaneous combustion of coal. The specific process is: air enters the interior of the coal body along with the cracks in the coal body, and the coal oxygen spontaneously recombines to release a large amount of heat, which is accumulated under certain heat storage conditions. When the accumulated heat can meet the needs of the development of the coal spontaneous combustion process, The temperature of the coal body continues to rise, which eventually leads to spontaneous combustion of the coal. [0003] In our country, mines that spontaneously combust are widespread and numerous, seriou...

AI Technical Summary

Problems solved by technology

But there are also great limitations: the gel has poor flow ability in the goaf, the penetration range is small, it is not suitable for extinguishing large-scale fires, the cost of use is also high, and the ammonium salt gel has a great impact on the environment

[0005] Some domestic scholars have successfully applied foam technology to fire prevention and extinguishing in coal mines. The three-phase foam covers the surface of the coal body. After a period of stability, the solid-phase medium can still cover the floating coal evenly after the foam bursts, which can permanently hinder the adsorption of oxygen by coal. , to prevent the oxidation of coal, so as to effectively prevent the spontaneous combustion of coal, but although the three-phase foam technology produces a large amount, the strength of the foam is low and the stability is poor, and the durability of the plugging cannot be guaranteed.