SU1121458A1 - Method of reducing the endogenic fire hazard in mined-out space - Google Patents

Abstract

THE METHOD OF REDUCING ENDOGENOUS HARNESS 5IR. BOTTOM SPACE, vkiochpyuschy yudachu an aqueous solution of angshshrogene vyra {) ta1P1 space, characterized in that, in order to novyshp uf (|) the efficiency of the pro: 1kpcheeky obrabotkpkp -: coal spontaneous ignition zone, aptinpr water solution () | -sna is fed across the movement of air leaks from the stored part of vept 11,1 pi () pn P1 track Nozadp clearing, starting from the boundary of fireproof 30 | 1Ы. § (L to 4 rec) 00

Description

The invention relates to the safety technique in the coal industry and can be used to prevent industrial fires during the excavation of E (5 hl, prone to spontaneous ignition), the system developed with the collapse of the roof.

The currently used technology of coal mining of thick flat and nylon layers provides layer-by-layer excavation, leaving an interlayer coal layer with a capacity of 0.5 m or more. When digging a seam into two or three layers of total thickness, the capacity of interlayer coal packs, deposited as operational losses, represents an increased danger of coal spontaneous combustion in any place of the developed space. Large losses of coal occur in places of geological disturbances, as well as in the development of thick layers and layers with variable power in mechanized complexes in one layer.

The greatest endogenous fire hazard is represented by coal losses in the developed space due to air leakage, and coal combustion ignites the following factors: duration and speed of air filtration, size and nature of the distribution of operational coal losses, and its oxygen sorption capacity airs

The known method reduces the endogenous fire hazard in the working space of mines, which consists in the fact that after working the area from the surface or from the mine workings, a network of wells is drilled into the developed space, through which the aqueous solutions of antipyrogen are supplied.

However, the method does not provide high-quality and uniform preventive processing of the entire area of the developed space, there is a need to drill a large number of wells, does not allow to combine the process of coal extraction and preventive processing of the developed space adjacent to a very close face, because of the danger of breaking through the solution of pyrogenogen into the lava workspace.

There is also known a method for reducing the endogenous fire hazard of an exhausted space, which consists in introducing an antipyrogenic agent into a virtual space through a separate air flow, which is supplied to the exhausted space through a sonar line with air leakage paths, the amount of air in the pipeline being equal to the natural air leakage, with ego pre-entering air-depressing surveys prior to entering the mined-in space to determine the values and it leaks. Besides

Moreover, to increase the efficiency of prophylaxis of the treatment of coal losses in long clearing holes by adjusting the thermophysical parameters of air leaks at the inlet to the inlet space and out of it, as well as controlling the process of condensation of water vapor from the air-antipyrogenic mixture before entering the antinogen in the developed space determine the temperature and moisture content of air leaks at the entrance to the worked-out space and exit from it, and the air-anti-pyrogenic mixture before entering the tannoe space is heated. This control is performed for processing quality by measuring the inlet air and te.mperatur antipirogennoy mixture at the inlet and outlet goaf 2.

However, this method is not effective for large cleansing faces, where it is necessary to create several points along their length for the input of an aqueous solution of pyrogen, which complicates the organization of preventive work, the work is expensive and technically difficult to implement.

In addition, this method requires the use of additional equipment, such as a ShVKS-5 compressor, a VMP-6 or PGR-BO fan, an Zh-6 pump, an em heater, an electric heater, piping, electrical equipment, cables, etc. which is located on platforms that block production, which in turn complicates the cleaning works, increases the cost of coal, and the presence in the system of heating devices in mines that are dangerous due to an explosion is unsafe;

The method is inefficient with straight-through circuits for airing the excavation sites, since the loss of aerosol from the air jet is observed 60-80 m from the injection site of the anti-pyrogen, while the fire hazard zone is located behind the clearing hole much further.

For example, the beginning of a fire-hazardous zone from the clearing of the bottom when it moves Lots - m / month, the incubation period of the spontaneous combustion of T 4 months and the safety coefficient of the clearing works K 0,7 will be

Lro, 0,7x80x4 - 224

m

With the use of recirculation schemes for airing the excavation sites, the duration of air leaks in the developed space outside the clearing area with speeds that create favorable conditions for coal to self-ignite (0.1-0.9 m / min) reaches 550 m. Therefore, self-ignition coal left in the developed space and processed by a known method.

behind the fireproof zone is possible. Spontaneous combustion of the coal in the developed space will occur behind the clearing of the hole at a distance of 224 m, while the extent of the possible spontaneous combustion of

Lno3 550-224 326 m.

This method does not ensure complete safety of cleaning works during the mining of coal seams that are prone to spontaneous combustion, which leads to a violation of the rhythm of work, reducing the load on the excavation site,

The purpose of the invention is to increase the efficiency of the prophylactic treatment of operational losses of coal in the developed space by treating the dam along the entire length of the active zone of spontaneous combustion of coal.

The goal is achieved by the fact that according to the method of reducing the endogenous fire hazard of an exhausted space, including the supply of an aqueous solution of an anti-pyrogen to the open space, an aqueous solution of an anti-pyrogen is applied across the air leakage movement from the part of the ventilation drift behind the cleansing face, starting from the extreme fire safety limit. zone.

The drawing shows a scheme for implementing a method for reducing the endogenous fire hazard of a goaf.

The method is carried out as follows.

The developed space 1 is treated on the side of the preserved part of the ventilation drift 2 behind the cleaning hole 3 at a distance equal to the length of the fireproof PPSE zone, and an aqueous solution of antipyrogen is introduced into the developed space across the air leakage movement.

The extent of the fireproof zone is determined from the formula

PbE Kr Loch,

whereKB01708 coefficient taking into account the safe conduct of work;

Loc-movement of the clearing face,

m / month;

t-incubation period of spontaneous combustion of coal, months

After clarification in the spent space 1, the water saturated with antipyrogens is repeatedly used in a closed cycle using a pump unit 5 and a piping system 6. Excess water is pumped to the working horizon or directly to the surface via a pipeline 7.

The monitoring of the quality of processing of the developed space I is carried out to measure the temperature and composition of the air leaving the dam along the entire length of the preserved drift 2, starting from the clearing hole. When a change in temperature or air composition is detected at any measurement point, the developed space is additionally treated by introducing a larger volume of water saturated with, for example, fire-fighting components of increased concentration. Processing is carried out until 0, until the temperature and composition of the air comply with the standards.

Thus, the additional aerodynamic drag created by

5, the flow of water directed into the worked-out space prevents the movement of air leaks along the dam, which reduces the extent of their action in the worked-out space. Increases wetting efficiency of the entire array.

0 collapsed rocks of the roof and coal, both within the treated area of the open space and beyond its limits in the course of the movement of leaks. In addition, the temperature of the self-heating coal decreases along the entire filtration path.

5 leaks. According to the method, the airborne anti-pyrogenic treatment of the dam is conducted along the entire length of the core of the spontaneous combustion of coal.

The proposed method allows multiple use of one volume of water in a closed cycle.

The application of the method will increase the load on the working face by combining mining and preventive maintenance, as well as control and timely extinguishing of possible fires in their initial stages.

Claims (1)

METHOD FOR REDUCING THE ENDOGENOUS FIRE HAZARD OF EXTREME BOTAN SPACE, including the supply of an aqueous solution of anti-pyrogen to the worked out space, which is explained by the fact that, in order to increase the efficiency of the preventive treatment of operational losses of coal in the worked out space by treating a blockage along the entire length of the coal self-ignition active zone , an aqueous solution of flame retardant is fed across the movement of air leaks from the side of the conserved part of the ventilation drift behind the face, starting from the extreme boundary along arobezopasnoy zone. SU „„ 1121458 I 1