SU1286790A1 - Method of extinguishing fires - Google Patents

Abstract

The invention relates to mining and makes it possible to extinguish underground fires with high efficiency by increasing the capacity of the pipeline (TP) for supplying fire extinguishing compositions and improving the heat and loss regime during nitrogen gasification. To this end, an inert fire extinguishing agent is prepared by mixing foaming agents (CEL) and liquid nitrogen directly in the fire zone, where the water collector is installed. Under the water level in the sump, the output ends of the separate TPs are placed for dl-a. BWP and nitrogen. Moreover, the output end of the TP for the supply of nitrogen is placed in the area of the STO exit. When extinguishing a fire, TP and nitrogen are supplied. At the outlet of the TP, nitrogen is reduced, due to a high heat exchange, is instantly evaporated, with the formation of a large number of puffs of inert foam. Collapsed rocks and a layer of water in the sump additionally contribute to the dispersion of foam flow. 1 hp f-ly, 3 ill. : sl CZ

Description

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The invention relates to methods of preventing and extinguishing fires and can be used to extinguish underground fires and mercury foam in isolated spaces of mines.

The purpose of the invention is to increase the efficiency of extinguishing underground fires by increasing the capacity of pipelines supplying extinguishing compositions and improving the mode of heat removal during nitrogen gasification,.

FIG. 1 shows a scheme for carrying out the method for extinguishing an underground fire through wells from the surface; figure 2 - the same, when extinguishing a fire in an isolated mine workings; in FIG. 3, a variant using a sump.

The scheme includes a tank 1 with liquid nitrogen, mounted on a car or a mine trolley site (in stationary complexes the tank is fixed), having a bellows hose 2 supplying nitrogen, pipeline 3 supplying a frother solution, equipped with a regulating valve 4 and a pressure gauge 5 and connected via elbow 6 to the casing 7 of squalling drilled into the treatment area from the cast section of the mine, and the pipeline 8 from the material with a high thermal conductivity, dismounted; 1 that cased in the casing 7, P By supplying liquid nitrogen for short distances, for example, by a dam (up to 8 m), it can be transported through an uninsulated pipe. Pipe icing plays the role of natural thermal insulation. When transporting liquid nitrogen over long distances, a special pipeline is required, for example, with high-vacuum or vacuum-powder insulation. When extinguishing a fire in an isolated mine workout, a pipe 7, provided with a pipe 9, is mounted in the body of an insulating bridge 10, while in the case of i-wah being flooded by the presence of a water collector, the outlet end of the pipe 7 is placed in water to improve the heat removal mode due to the environment during generation foam,

The method is carried out as follows.

To casing pipe 7 squash drilled into the goaf

or installed in the body of the jumper of an isolated fire area, subjected to treatment with inert foam, connected by means of a knee

b or pipe 9 a pipe for supplying a foaming agent solution; in this case, a pipeline 8 for supplying liquid nitrogen is introduced into the casing pipe. For a short casing pipe this

may be bellows hose. When extinguishing a fire, in the isolated excavation, the output ends of the pipelines supplying the foaming agent solution and liquid nitrogen are preferably placed under the water level of the catchment basin or overflow channel. The bellows hose 2 for supplying nitrogen nitrogen is then connected and the foaming agent and liquid nitrogen are supplied through casing 7 and conduit 8. At the outlet of the pipeline, nitrogen is washed by the foaming agent due to high heat exchange, evaporates instantly to form a large amount of inert bubbles foam. Improving the heat removal regime provide the environment of the fire site (accumulation of rock, heated air, water catchment basin, etc.). In this case, the collapsed rocks and the water layer in the sump additionally contribute to the dispersion of the stream.

The proposed method allows for existing casing diameters (50-100 mm) to dramatically increase the supply of inert foam when extinguishing fires in hard-to-reach places (space developed, isolated areas of mine workings, dome mining, mine workings after the collapse, and m, n,) .

Claims (1)

1. A method of extinguishing fires, including pumping through pipelines into a firefilled area, having an inert foam water collector prepared by mixing a foaming agent and liquid nitrogen, characterized in that, in order to increase fire extinguishing efficiency by increasing the capacity of the pipelines and improving the mode heat removal during nitrogen gasification, mixing of the blowing agent and liquid nitrogen is carried out in a fire zone, 13 5Fi8.1  l /// /// /// /// /// // fO  // /// /// /// /// /// / 7 / /// 7 // /// /// /// ///// 3-i W /// //////////////// /// A / 7 / ////// / 7 / / U / // U // U / A eight / w FIG. J