SU1305388A1 - Method of extinguishing underground fire - Google Patents

Abstract

The invention relates to the mining industry and is intended to eliminate underground fires in the development of minerals. The goal is to increase the efficiency of extinguishing and eliminate the recurrence of a fire by deactivating the coal surface and preventing the generation of combustible gases. To do this, the collapsed mountain mass having a fire source is treated with an antipyrogen in two stages. In the first stage, a halogenated foam is used which inhibits the burning of volatile products of the oxidation of coal. As a result, fiery burning is eliminated and the mine atmosphere is prevented from exploding. In the second stage of processing, a mixture of calcium chloride or calcium hypochlorite with a frother and water is used in the ratio of the components, respectively, wt.%: 5-7, 2-6, the rest. This mixture inhibits the process of heterogeneous oxidation of coal, reduces its chemical activity and the generation of combustible gases. Free chlorine is released, which also prevents the mine atmosphere from exploding. 1 il. i Ico: about D1 CAD 00 00

Description

11305388

The invention relates to the mining industry and can be used to extinguish underground fires in the development of mineral resources.

The purpose of the invention is to increase the efficiency of extinguishing and eliminate the recurrence of fire by deactivating the coal surface and preventing the generation of combustible gases.

In the first stage of treatment, halogenated hydrocarbons, enclosed

in foam, inhibit the burning of volatile products of the oxidation of coal, eliminate flaming combustion and prevent the mine atmosphere from exploding. In the second stage of treatment, chlorine lime or calcium hypochlorite inhibit the processes of heterogeneous oxidation of coal, reduce its chemical activity and the generation of combustible gases. In addition, these substances decompose in the process of fire, release active chlorine, which inhibits oxidation processes in the gas phase and helps prevent the mine atmosphere from exploding. When using such a two-stage treatment, a more effective elimination of the source of fire is achieved, since this produces new properties,

, but. it is the elimination of the fire source that is achieved by the lower total costs of the means used (surfactants, inhibitors, halogenated hydrocarbons) and more

Short deadlines due to postadiene exposure to both homogeneous and heterogeneous oxidative processes: the risk of a recurrence of a fire and the re-formation of an explosive situation is eliminated due to the deactivation of the coal surface and the cessation of the generation of combustible gases.

The drawing shows a process flow diagram for the implementation of the proposed method.

The technological scheme includes a foam generator 1, to which pipelines 2-4 with valves 5-7 are connected to supply, respectively, a foaming solution from tank 8, halogenated hydrocarbons from tank 9, bleach solution or calcium hypochlorite from the tank 10 and nitrogen from the gas generating plant 11.

The proposed method is implemented as follows.

In the excavated space 12 in the area of the hearth 13 of the fire is drilled

five

0

five

0

a well 14, a foam 15 connected to the outlet of the foam generator 1 is supplied to it. In containers 8 and 10, a leaching solution is prepared containing 2-6% of a frother and a 20% solution of calcium chloride or hypochlorite. The concentration of the foaming agent is based on the generally accepted consumption rates, depending on its nature, and the concentration of inhibitors is accepted, based on their solubility until the solution is completely saturated. The tank 9 is filled with a liquid halogenated hydrocarbon, for example, freon 114B2. Before supplying the foam, valves 5 and 6 are opened, the pump 16 is turned on, the foaming solution enters the foam generator and is displaced with the liquid hydrogen halide coming in through ejection, while nitrogen gas flows from pipe 11 into the foam generator 1. Thus formed foam through the foam pipe 15 and the well 14 enters the area of the hearth 13 of the fire. The required concentration of halogen hydrocarbon is controlled by varying the replenishment coefficient by means of the valve 5 in the pipeline 3.

five

0

0

Halogenated foam 17 enters the area of the hearth 13 of the fire and phlegmatizes the mine atmosphere, changing the gas composition in the direction of non-explosive mixtures. In the area of the fire nidge 13, the foam is destroyed with the release of halogenated hydrocarbons, which eliminate fiery burning.

After the elimination of the flame burning, the valve 6 is closed and the valve 7 is opened, and in the same mode, foam is already active, containing calcium chloride or calcium hypochloridate. The content of bleach in the liquid phase is maintained at 6–7%, and that of hypochlorite, 5–7% due to the change in the ejection coefficient of valve 5 in pipeline 3. The active foam layer 18, following the halogenated foam layer 17, deactivates the coal surface in the area of the fire and, entering further directly into the fire center 13, inhibits heterogeneous oxidative processes, stops coal smoldering and reduces its chemical activity. The release of chlorine promotes phlegmatization of the environment.

five

313

After stopping the supply of foam, its destruction and reopening of the area of the fire, despite the fresh air stream, the heterogeneous oxidation processes practically do not resume as a result of deep coal deactivation. This eliminates the generation of heat and volatile products, and therefore eliminates the recurrence of fire and the recurrence of an explosive situation.

Claims (1)

The invention of the method of extinguishing an underground fire, which includes a two-stage treatment of mined-5 crumbling rock mass having a hearth fire retardant, characterized in that, in order to increase the efficiency of extinguishing and prevent recurrence of fire by deactivating the coal surface and preventing the generation of combustible gases, to treat the rock mass of the rock mass in the first stage, g aloidated foam is used, and in the second stage - a mixture of bleach or calcium hypochlorite with a foaming agent and water in the following ratio, wt.%: chlorine lime or calcium hypochlorite 5-7 foaming agent 2-6 WaterOther Editor L. Langazo Compiled by I.Fed eva Tehred A. Kravchuk Proofreader S. Shekmar Order 1409/32 Draw 430 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4