SU861646A1 - Method of preventing and fighting fire in mine worked-out space - Google Patents

Description

The invention relates to the mining industry, mainly to coal, and can be used for the prevention and suppression of endogenous fires.

A known method of extinguishing a fire, comprising supplying carbon dioxide to the fire in the form of a stable aerosol W.

There is also known a method of preventing and extinguishing an endogenous fire in a mine mine space, including preparing a fire extinguishing mixture in the form of a stable aerosol and supplying it to the place of the fire site, 15 moreover, tetrafluorodibromethane pairs are used as a component of the fire extinguishing mixture, which are introduced into the ventilation flow of the mine and then to the fire source f2j:

A common drawback of known nye rayas with the use of gases and gas-vapor mixtures of prophylaxis and fire extinguishing is the impossibility of effective prevention and extinguishing of fires; It is explained by the fact that both inert gases and vapor – gas mixtures exert a passive effect on the coal mass, without affecting its chemical techinert for the burning properties and kinetics. To achieve a positive effect, complete displacement of oxygen from the exhausted space and its replacement with an inert vapor-gas mixture is required. However, the achievement of such an effect is not possible due to the presence of the aerodynamic connection of mining through the collapse zone with the day surface. This circumstance contributes to an intensive intake of introduced inert gases or gas-vapor mixtures from the worked out space through the leakage channels, which requires constant recharge.

The aim of the invention is to increase the effectiveness of the prevention and extinguishing of an endogenous fire by affecting the chemical properties of coal and its combustion kinetics.

This is achieved by the fact that ethyl bromide vapors are used as another component of the extinguishing mixture in a ratio of 1: 1, and the extinguishing mixture is fed into the worked out space from the bottom up after reaching the equalized air pressure.

The method is carried out as follows.

When _h hearth occurrence of spontaneous combustion in goaf from the bottom floor with a special aerosol generator through line via an insulating jumper serves antipirogen-inhibitor in the form of an aerosol, a mixture of vapors of ethyl bromide and tetra fluorine (Freon 114b2) in the ratio 1: 1. The supply of aerosol is carried out after equalizing the air pressure between the exhausted space and the surface. The supplied aerosol fills the exhausted space to the entire floor height and is kept in it by creating a constant pressure equalized with the surface! 5 or by adjacent layers for the time necessary for the effect of the flame retardant inhibitor on the chemical properties of coal.

Due to sorption of vapors of ethyl bromide 20 ethyl and Freon 114B2 with coal, its chemical activity decreases by 15-20%, which, in turn, reduces the incoming part of the heat balance of the coal cluster, and therefore the danger of its spontaneous combustion. Vapors of a mixture that have not undergone sorption, condensing, coolantly act on combustible reagents. In the presence of methane-hydrogen accumulations in the cleaned working space, pairs of bromphreon-30 mixture phlegmatize them, breaking the chains of explosive combustion reactions even in the presence of a heat pulse. The flame of foci of self-ignition of coal is inhibited by the physicochemical effect on the combustion process, which consists in cooling hot accumulations of coal, displacing air oxygen from them, and breaking the combustion reaction chains. Pressure equalization to keep aerosol 4Q sol in the worked-out space from leaks or dilution with air is carried out by means of a special automatic air pressure control system SREDA-1, developed by the Eastern branch of VNIIGD. The SREDA-1 system consists of a compensating installation, built in a controlled pressure chamber on the return horizon, and two automatic ventilation windows, built in the lock bridges on the ventilation horizon. The use of ethyl bromide vapor and Freon 114B2 was taken from the condition that the extinguisher toxicity be reduced. The ratio of the components in the mixture 1: 1 is taken on the basis of studies conducted by the Eastern branch of VNIIGD as having the most effective fire extinguishing properties, as well as on the basis of a feasibility study taking into account the cost of 114B2 freon and ethyl bromide ..

An advantage of the invention lies in the fact that the proposed method enables the volumetric distribution of the aerosol extinguishing mixture from the place of its withdrawal, which, even if the location of the self-ignition or burning point is unknown, leads to flooding by antipyrogen inhibitor pairs and, due to equalization of air pressure, to aerosol retention in the worked out space for a given time. This reduces the consumption of the inhibitor, eliminating the need for multiple exchange of the extinguishing mixture in the worked out space in the presence of air leaks (leaks).

Claims (1)

Claim A method for the prevention and extinguishing of endogenous fires in a mined space of a mine, including the preparation of a fire-extinguishing mixture in the form of a stable aerosol, one of the components of which is tetrafluorodibromoethane vapor and supplying it to the site of the fire, in order to increase the effectiveness of prevention and extinguishing an endogenous fire by affecting the chemical properties of coal and the kinetics of its combustion, 1: 1 vapors of ethyl bromide are used as another component of the fire-extinguishing mixture, and negasitelnuyu mixture was fed into goaf bottom up after reaching of adjusted air pressure.