SU1278445A1 - Method of underground processing of coal - Google Patents

Abstract

The invention relates to the underground processing of coal and increases the yield of liquid products for. by dissolving non-carbonated carbon. Boreholes are drilled from the surface to the coal seam and coal is gasified. The formation is divided into two blocks. Gasification is performed in one block. The gasification products of the first unit preheat the formation of the second unit. Preheating is carried out up to 250-400 ° C. After this temperature has been reached, the blocks are separated from each other by an impenetrable partition. Then, in the second block, coal is liquefied by feeding into the heated reservoir in the critical state of aliphatic alcohols or their water-alcohol mixture. The products of thermal dissolution in the form of a pulp are pumped out and fed to a separator. 1 Il.

Description

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The invention relates to the underground processing of coal and, more specifically, to the thermal dissolution of an underground coal seam due to the creation of high temperature and pressure, ensuring the flow of relevant chemical processes in the coal in such a way that it becomes possible to extract it from under the earth in the form of gas and liquid, as well as directly underground gasification of coal, and can be used for mining deep-seated low-thickness coal seams in order to produce liquid and gaseous fuels and associated valuable tonic products.

The purpose of the invention is to increase the yield of liquid products by dissolving non-carbonated carbon.

The drawing shows a diagram of the processing of coal seam. J The diagram shows the coal block 1 5 in which the underground is produced

gasification of coal Black coal block II, borehole 1, used for blowing, borehole 2, serving to split the coal seam into two blocks, borehole 3, which is used to pump liquid and gas thermal dissolution products, 4 to pick up the generation gas after separating the coal seam two units, a well 5, through which the solvent is supplied, a compressor 6, a separator 7, a warehouse 8 and a heat exchanger 9.

The method is carried out as follows.

Through boreholes 1–3 with closed wells 4 and 5, limestone method (for example, by injection of water or air under pressure) creates coal channels sequentially in sections 1-2 and 2-3. The sequence of creating channels can be changed, for example channels can be created sequentially sections 1-4.4-5 and 5-3. As a result, a single channel is created between wells 1-3. After this, the compressor 6 is supplied with a blast to well 1 and underground gasification of the coal seam in the area of well 1 is carried out in a known manner. gas while carried out through the well 3 at the closed wells 2 4 and 5, With the spread of the hearth in the direction of the well 4 go278445

3:

The generator gas is used to dry and heat the coal seam in section 2-3.

After several days, when due to the heat of the generator gas, the temperature of the coal seam in section 2-3 reaches the required reaction temperature (250 -), through well 2 into the coal channel

charge is introduced and an explosion is performed to collapse the roof of the channel in the area of well 2. For a more reliable separation of the coal seam, an aqueous solution is fed through the same well 2.

cement with sand. Thus, the coal seam is divided into two blocks I and II. After that, the generator gas is extracted through well 4 with its further flow through heat exchanger 9 on

Warehouse 8 If, after dividing the coal seam into two blocks, the coal temperature in section 5-3 falls below reactionary, generating gas from heat exchanger 9 is fed through well 5 to coal block II (section 5-3) and removed through well 3 to further heat the coal on this site. After that, the solvent with

0 of the warehouse 8 through the heat exchanger 9 and the well 5 is pumped under pressure into the coal block II, and the thermal solution in the form of slurry is pumped through the well 3 to the surface and

5 is fed to the separator 7, after which the separated solid, liquid and gaseous phases enter the warehouse 8. The distilled solvent through the well 5 is again fed to the repeated

0 cycle to coal block AND,

The solvent circulates until it is removed from the coal block II, its organic

5 part. Then the spent block II is subjected to additional gasification by a known method. In this case, residues of undissolved carbon and solvent adsorbed by host rocks are used.

Claims (1)

Invention Formula The method of underground coal processing, 5 including drilling wells from the surface to the coal seam, preheating the reservoir with gasification products and liquefying coal by submission to the heated formation in the supercritical state of aliphatic alcohols or their water-alcohol mixture, about t-l and due to the fact that, in order to increase the yield of liquid products due to the dissolution of non-carbonated carbon, preheating is carried out to The reservoir holes 250 -, wherein the reservoir is divided into two blocks and produces ; gasification in one of them, and preheating and liquefaction of the plate in the other - gasification products of the first block, and after reaching the specified temperature, the blocks are separated from each other by an impermeable crosspiece.