SU1435801A1 - Method of preventing and extinguishing endogenic fires - Google Patents

Abstract

This invention relates to the coal industry. The goal is to increase the effectiveness of fire extinguishing prevention. In the area of the spontaneous ignition center, a drill hole is drilled to mark the place of the fire. Directly at the well location site, a slurry of gypsum composition is prepared, which is fed into the well simultaneously with aluminum sulphate solution through two insulated pipelines. The components are mixed in the well with carbon dioxide evolution and the formation of a foamed slurry, which increases the fire extinguishing efficiency. The ratio was ush, their resulting suspension is the following,% by weight of dry matter: gypsum in a hearth, its 86-94; chalk ground 3-7, aluminum sulphate 3-7. The foamed gypsum mix fills all voids and chinks around the fire, produces heat removal, releases inert gas and solidifies. (L

Description

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This invention relates to safety in the coal industry and can be used to prevent and extinguish underground fires.

The aim of the invention is to increase the effectiveness of the prevention and extinguishing of fire.

The method is carried out as follows.

In the area of the alleged outbreak of spontaneous combustion, several wells are drilled along its contour (at least three) and are surrounded by pipes. In working out, a mixture of gypsum with chalk and an aqueous solution of aluminum sulphate is prepared at the injection site. A dry gypsum mix (94-86% gypsum and 3-7% chalk of the total weight of dry components) is loaded into the aggregate hopper, where it is mixed with water at a normal water-hard ratio with a solution mobility of 180 mm and transported through a rubber-fabric sleeve to the mixer installed in front of well. An aqueous solution of aluminum sulphate (3-7% by weight of dry components) is fed to the mixer under pressure through the other hose, where the solutions are mixed and the foam mass is transported through the well to the spontaneous combustion area.

During transportation along the well and at the site of the spread of the gypsum mix, carbon dioxide is released from the reaction between calcium carbonate and aluminum sulphate, which foams the gypsum mix. .

Carbon dioxide is released as a result of the following chemical reaction:

/ 2 (5O,) 3 + 3 // 20-f ЗСаСО, - 3CaSO + + 2Al (OH) 3 + 3C02i

The foamed gypsum mix fills all voids and cracks around the fire, produces heat removal from the surfaces to be treated, releases inert gas and solidifies. Thus, the center of spontaneous combustion is isolated for a long time by a solid shell filled with carbon dioxide.

Example 1. A dry gypsum mix mixture containing 94% gypsum and 3% chalk (by weight) is loaded into the monolith aggregate bunker, where it is mixed with water with a slanting ratio of 0.56 and as a mortar mixture with a mobility of 180 mm Suttard viscometer is fed to the mixer. Alternatively, a solution of aluminum sulphate (3% by weight of dry matter) is fed into the mixer. The solutions are mixed and well pumped and the area of the center of spontaneous combustion. In the process of pumping, at the place of spreading of the resulting solution, as a result of the reaction between calcium carbonate and aluminum sulphate, 5.87 m of carbon dioxide gas is produced from 1 ton of solution, which foams the gypsum melt solution.

Example 2. In the bunker unit "Monolith

they load a dry gypsum mix containing 90% gypsum and 5% chalk (by weight), where it is mixed with water with a water ratio of 0.56 and in the form of a mortar mixture with a mobility of 180 mm using a Suttard viscometer is fed to the mixer. Alternatively, a solution of aluminum sulphate (5% by weight of dry matter) is fed into the mixer.

The solutions are mixed and are not pumped through the well 5 into the area of the center of spontaneous combustion. During the injection process and at the site of the spread of the resulting solution, as a result of the reaction between calcium carbonate and aluminum sulphate, 9.73 m of carbon dioxide gas is produced from the It solution, which foams the gypsum melt solution.

Example 3. In the bunker unit "Pneumolite load dry gypsum mix,

containing 86% gypsum and 7% chalk (according to

mass), where it is mixed with water at

5 waters with a ratio of 0.56 and in the form of a mortar mixture with a mobility of 180 mm using the Suttard viscometer are supplied to the mixer. Alternatively, a solution of aluminum sulphate (7% by weight of dry matter) is fed into the mixer. The solutions are mixed and pumped through the well to the area of the spontaneous combustion center. During the injection process, and at the site of the spread of the resulting solution, as a result of the reaction between calcium carbonate and aluminum sulphate, 13.72 m of carbon dioxide gas is produced from 1 ton of solution, which foams the gypsum melt solution.

Claims (1)

Invention Formula The method of preventing and extinguishing endogenous fires, including drilling a well in the area of the center of spontaneous combustion, preparing a foam suspension and feeding it through the wells to the center of spontaneous combustion, characterized in that. that, in order to increase the efficiency of prophylaxis and fire extinguishing, the preparation of foamed slurry is carried out in the well, while the well is fed simultaneously through two insulated pipelines and an aqueous gypsum mist suspension and an aluminum sulphate solution 0 are mixed in the following ratio of the resulting foam slurry % by weight of dry matter; Gypsum per serving86-94 Chalk, ground3-7 Aluminum Sulphate3-7