SU1647125A1 - Method of underground treatment of coal seam - Google Patents

Abstract

The invention relates to mining, in particular to the processing of coal in the field where it lies, and m. used to produce heat and electricity. The goal is to increase the processing efficiency of xto F toptHU rV / pwv coal seam products by increasing the energy extraction from gasification and obtaining steam purified from gasification products. In the underlying rocks, UE 3 blows a blower 2 and a gas vent hole (C). Between C 1 and 2 in the roof and the soil of the UE and in the UIP itself, permeable zones are formed using hydraulic fracture. Particularly 4 and 5 zones for water supply are formed in the roof and the host rocks of the UE 3 at a distance determined by a given formula, and they are connected with C 1 and 2 With C 2, UE 3 is supplied with air, they ignite UE 3 and form a burning hearth 7. The resulting combustion products are discharged through C 1 into the heat exchanger 8. Water is injected in countercurrent to the combustion products in C 1 in a weight ratio to the air determined by the given formula. The steam is discharged through the gas discharging C 2 separately from the gasification products 1 or 3 fe dojdy . Oh § u ate

Description

The invention relates to mining, in particular to the processing of coal at the place of its occurrence, and can be used to generate thermal energy and electrical energy.

The purpose of the invention is to increase the efficiency of coal seam processing by increasing the extraction of energy from gasification and the production of steam purified from gasification products.

In this method, the water, filtered through permeability zones, senses the heat generated during the oxidation of the coal, and is heated. In this case, the mode of combustion in the hearth is optimal.

The best heat balance is achieved by supplying water and air in a ratio derived from the amount of heat that is released during the oxidation of carbon.

1 kg2.67 kg

C 02 C02 +7100 kcal / kg mol and the amount necessary to absorb this heat

miKisp. H

ma 13, (Tn-T0) + rJ where mi, gp2 is the mass of water and air, respectively, kg;

q-specific heat release during combustion of 1 kg of carbon, kcal / kg;

Cisp is the coefficient of heat loss in the rock strata separating the coal seam and fracturing cracks;

c- specific heat capacity of water, kcal / kg;

g — specific heat of water vaporization, kcal / kg;

TP - temperature, necessary for consumer, ° С;

That is the initial temperature of the injected water, ° C.

The water heated to the required temperature is extracted from the production well and sent to the power unit or to the heat supply network.

Formation of additional permeability zones in the roof and soil of the reservoir, separation of the source of combustion and water filtration zones significantly increases the completeness of extraction of the coal seam energy, prevents the resulting steam from contamination by combustion products.

The method is explained in the drawing.

The coal processing scheme includes a well 1 for injecting water and removing combustion products, a well 2 for supplying air and removing steam (mining), coal seam 3, zones 4 and 5 of permeability (hydraulic fracturing) in the roof and soil of the formation; zone

6 for supplying air, a fire chamber 7, a heat exchanger 8, a heat supply network 9, and packs 10-13. The method is carried out as follows.

Drill two wells 1 and 2 of the three-pipe structure into the soil of the coal seam 3. Between the wells 1 and 2 in the roof and soil of the seam, as well as in the coal seam 3 with

using hydraulic fracturing, additional permeability zones 4.5 for water supply and zone 6 for air supply are formed. The well 2 in the coal seam 3 serves the air, coal seam is ignited

and form the hearth 7 burning. In order to avoid steam contamination by combustion products, three hydrodynamically independent contours are created. To create them, wells 1 and 2 install a packer system. The packers 10 and 11 installed in the well 2 serve to prevent steam from entering zone 6, and the packers 12 and 13 installed in the well 1 prevent water from contacting the combustion products. The resulting combustion products are discharged through the well 1 into the heat exchanger 8. In the countercurrent to the combustion products into the well 1 water is injected in a ratio

mi kisp -q

gp2 13, (Tp-To) + heat exchanger 8 passed and the residual heat removed from the combustion products. The heated water is injected into well 1,

filtered by zones 4 and 5 of permeability in the roof and the soil of the reservoir; it takes away the heat generated during the oxidation of the coal; it is heated and the resulting steam is discharged through the internal column of well 2 to the network 9

heat supply or energy, unit.

Claims (1)

The invention of the method of underground processing of coal seam, including the drilling of a blast and gas extraction wells on the reservoir, assembling them through the coal seam, supplying an air oxidizer to the blast hole, discharging coal gasification products, supplying water to a permeable zone to meet the flow of blowing and removal of steam to the surface, characterized in that, in order to increase processing efficiency by increasing the extraction of energy from gasification and obtaining steam purified from gasification products, wells are drilled into the underlying rocks of the coal seam, permeable zones for supply water is formed in the roof and surrounding rocks of the coal seam at a distance from it, determined by the formula . 52.5 + h L 1D 20 where L is the distance between wells, m; h is the depth of the coal m; and connect them to the wells, water is supplied to the permeable zones through the blow hole in a weight ratio to the air, defined by the formula PM Kisp. ABOUT. ma 13, (Tn-To) + gG where m 1 and m are the mass of water and air, respectively; Kisp. - coefficient of heat loss in the rock strata separating the coal seam and permeable zones; q - specific heat generation during combustion kg of carbon, kcal / kg; c- specific heat capacity of water. kcal7kg; r-specific heat of water vaporization, kcal / kg; TP - temperature, necessary for consumer, ° С; That is the initial temperature of the injected water, ° С steam is discharged through the gas exhaust well separately from the gasification products.