SU1420183A2 - Apparatus for extinguishing underground fires - Google Patents

Abstract

This invention relates to the mining industry. The purpose of the invention is to increase the efficiency of extinguishing due to the intensification of the cooling of fire gases and rocks in the combustion zone. The device has an intermediate isothermal tank (E) 9 for liquefied inert gas, having an inlet 10 and an outlet 1 1 branch pipes with shut-off valves 12 and 13. The branch pipe 10 is installed in the upper part of E 9 and through pipe 14 is connected to a cylinder 16 filled with liquefied inert gas. The nozzle 11 is located at the bottom of the E 9 and is connected via a low-temperature pipeline 8 to an ejector 5. In the latter, a liquefied inert gas exiting at high speed creates an ejecting force and in a spray form mixes with the ejected high-temperature firefighters gase. As a result, intense heat transfer takes place between the gases. The liquefied inert gas passes from the liquid phase into the gaseous one, which inert the gas mixture and ensures its intensive circulation through the system. 1 ill., 1 tab. (L

Description

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The invention relates to mining, and can be used in guiding fires in a confined space.

I The purpose of the invention is to increase the efficiency of fire extinguishing due to the intensity of cooling of fire gases and rocks in the combustion zone.

The drawing shows a schematic diagram of the proposed device.

The device consists of jumpers 1 and 2,: installed in the workings and shut off - I Sh. IH of the fire field, pressure 3 I and suction 4 pipelines, connecting I work, ejector 5 with inlet pipe 6 and ; Scrap 7, connected to a low-temperature pipeline 8, which, through intermediate 1 isothermal tank 9, has I sh, 10 inlet 10 and outlet 11 spigot I with shut-off valves 12 and 13, is connected via conduit 14 with valve 20

15 balloon 16 filled with a liquefied inert gas, for example carbon dioxide.

The system works in the following way.

Open the valve 12 of the inlet pipe 25 10 intermediate isothermal tank 9 and the valve 15 of the cylinder 16.

LP gas from cylinder

16 under pressure enters the isothermal tank 9 via pipeline 14. The gas pressure in the upper part of intermediate tank 9 is controlled by valve 15 of cylinder 16.

The valve 13 installed in the outlet pipe 11 of the intermediate tank 9 is opened. The liquefied inert gas in the liquid phase due to the overpressure 35 in the upper part of the intermediate tank 9 flows through the low-temperature pipeline 8 to the ejector nozzle 7 5. In the ejector the liquefied inert gas leaving at high speed from the nozzle, creates an ejecting force and in the sprayed form mixes with the ejected high-temperature fire gases. As a result, there is an intense heat exchange between the gases, and a liquefied inert gas (with

Effective cooling of fire gases and rocks in the combustion zone is achieved by intensively supplying the necessary flow rate of the refrigerant - a liquefied low-temperature inert gas, which is provided by the design parameters of the low-temperature pipeline determined by empirical dependence

.6.

where 1 is the length of the low-temperature pipeline (determined under specific conditions by mining engineering factors influencing the choice of installation location), m; d is the diameter of the low temperature pipeline (determined depending on its length), m;

. b - diameter of the ejector nozzle, determining the flow rate of the liquid phase of a liquefied inert gas, m; kg empirical coefficient. It is determined in advance by experiment, depending on the parameters of the ventilation pipe and its aerodynamic resistance, as well as on the ejection properties of the nozzle, depending on its diameter. The coefficient Ke characterizes the level of inert gas head during the operation of an ejector, which (head level) according to the laws of hydraulics is proportional to the ratio of the length of the pipeline to its diameter to a fifth degree.

Examples of determining the geometric parameters of the low-temperature pipeline are given in the table.

Claims (1)

Invention Formula A device for the suppression of underground fires on the ed. St. No. 643655, characterized in that, in order to increase the efficiency of fire extinguishing due to the intensification of cooling of fire gases and rocks in the combustion zone, the device is equipped with an intermediate isothermal tank for liquefied inert gas having inlet and outlet nozzles with shut-off valves. the nozzle with a boiling point of -195.8 ° C) from a liquid in the upper part of the intermediate tank This phase is transformed into a gaseous phase, which inerts the gas mixture and, due to the ejector force, the ejector ensures its intensive circulation through the system: fire field - ventilation pipe - ejector. and through a pipeline connected to a balloon filled with a liquefied inert gas, and the output in this part of the intermediate tank and through a low-temperature pipeline connected to the ejector. Effective cooling of fire gases and rocks in the combustion zone is achieved by intensively supplying the necessary flow rate of the refrigerant - a liquefied low-temperature inert gas, which is provided by the design parameters of the low-temperature pipeline determined by empirical dependence .6. 0 five five 0 where 1 is the length of the low-temperature pipeline (determined under specific conditions by mining engineering factors influencing the choice of installation location), m; d is the diameter of the low temperature pipeline (determined depending on its length), m; . b - diameter of the ejector nozzle, determining the flow rate of the liquid phase of a liquefied inert gas, m; kg empirical coefficient. It is determined in advance by experiment, depending on the parameters of the ventilation pipe and its aerodynamic resistance, as well as on the ejection properties of the nozzle, depending on its diameter. The coefficient Ke characterizes the level of inert gas head during the operation of an ejector, which (head level) according to the laws of hydraulics is proportional to the ratio of pipeline length to its diameter to the fifth degree. Examples of determining the geometric parameters of the low-temperature pipeline are given in the table. Invention Formula A device for the suppression of underground fires on the ed. St. No. 643655, characterized in that, in order to increase the efficiency of fire extinguishing due to the intensification of cooling of fire gases and rocks in the combustion zone, the device is equipped with an intermediate isothermal tank for liquefied inert gas having inlet and outlet nozzles with shut-off valves. nozzle installed in the upper part of the intermediate tank  flax at the top of the intermediate tank and through a pipeline connected to a balloon filled with a liquefied inert gas, and the output in this part of the intermediate tank and through a low-temperature pipeline connected to the ejector. 100 10 5-10 to 2-10 2,5.10 -2 3 1g 2. 10 1.6 -10 -2