RU2678246C1 - Method of underground gasification of coal in cryolithic zone condition - Google Patents

Abstract

FIELD: mining.SUBSTANCE: invention relates to the mining industry and can be used for underground gasification of coal in permafrost conditions. Method includes passaging inclined workings along coal seam, connected to the surface at the top and among themselves at the bottom to create a fire slaughter. Organ lining is installed between the prepared pillars, wire saws are laid around at least two pillars, and as the next pole is burned out, hemming of the coal seam is conducted using wire saws.EFFECT: technical result consists in excluding the overlap of the firing face with the thawed rocks of the roof.1 cl, 2 dwg

Description

The invention relates to the mining industry and can be used in the conditions of a permafrost zone to increase the reliability of obtaining gasification products in the required volumes and reduce coal losses in reserves.

A known method of underground coal gasification, including conducting coal seam of two inclined workings, interconnected by a horizontal drift and from the surface of the earth by vertical wells [1].

The main disadvantage of this method is that under the conditions of cryolithozone the formation roof is thawed, passes into the zone of positive temperatures and the rocks during the collapse can block the fire face.

There is a method of underground coal gasification, including the burning of pillars of coal left after using deep seam mining technology [2] - a prototype.

The disadvantages of this method are:

- the possibility of overlapping the fire face with thawed rocks of the roof;

- collapse of roof rocks between pillars during coal burning.

The technical task was to ensure a reliable and continuous process of burning a coal seam by maintaining the fire face in a normal state throughout the entire process.

The technical result obtained is the elimination of the overlapping of the fire face with thawed roof rocks, which ensures the reliability of underground gasification.

The proposed method is characterized by the fact that in the workings between the prepared columns of coal, a fire-resistant organ support is installed, wire saws are laid around at least two columns, the mouths of the workings are reliably sealed, devices for blasting (gas removal) are created in the insulating jumpers and, as the next column of coal burns out, they lead coal bedding with a cable saw.

Introduced in the claims, such an essential feature, as the fact that between the pillars in the workings a fire-resistant organ support is installed, allows for reliable burning to eliminate the complete collapse of the roof in the workout, to save free space at the next pillar.

Another significant sign that wire saws are being laid around at least two posts makes it possible to safely prepare the other post for burning.

The next significant sign is that as the column is burned, the formation is cut with a wire saw to increase the reliability of the work of the face, to eliminate its complete overlap and reduce coal losses in the columns.

The method is illustrated by drawings, where in FIG. 1 shows in plan a section of a formation prepared for burning out, in FIG. 2 is a section AA in FIG. one

Symbols adopted in the drawings: 1 - a section of a coal seam; 2 - columns of coal; 3 - inclined working; 4 - fire-resistant organ support; 5 - wire saws; 6 - cable saw drive; 7 - sealing wall, 8 - devices for blasting (gas removal), 9 - fire face.

The method is as follows:

In the area of the coal seam 1, prepared for burning, between the posts 2 in the inclined workings 3, fire-resistant organ supports 4 are installed, and around the posts 2, wire saws 5 with drives 6 installed on the surface are laid. The mouths of the workings 3 in the places where the coal seam exits to the surface are isolated with a continuous sealing wall 7, in which devices for blasting (gas removal) are installed 8. After creating the fire face 9, as the seam burns out, the wire saw 5 for cutting the seam is put into operation, which ensures reliable operation fire face 9 and its blockages are excluded.

The advantages of this method are:

- mining safety;

- reliability of the gasification process;

- coal losses are reduced.

Information sources

1. V.Zh. Arena Physical and chemical geotechnology. - M .: Publishing house of the Moscow State Mining University. 2001 .-- S. 370-371.

2. RF patent No. 2311531 Е21В 43/295. - 2007.

Claims (1)

A method of underground coal gasification in a cryolithozone environment, including carrying out inclined workings over a coal seam connected to a surface in the upper part and to each other in the lower part to create a fire face, characterized in that fire-resistant organ supports are installed between the prepared pillars around at least 2- x pillars are laid with wire saws, and as the next pillar is burned, a coal seam is cut with wire saws.

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