SU1392085A1 - Method of underground gasification of coal - Google Patents

Abstract

The invention relates to the mining industry and m. used for mineless mining of coal and other combustible minerals by means of their gasification at the place of occurrence. The purpose of the invention is to improve the quality of the gas-vapor mixture. The coal seam (UE) is opened by the wells and a well-reaction channel is created between them (using a hydraulic fracture or burning of the UE). Knee pack, form the face and blunt, the air is supplied oxygen air blowing towards the fire slaughter. In the direction of movement of the fire in the burnt-out zone from the surface, a mixture of water with metals is supplied. Water is mixed with nickel or cobalt, or iron, or mixtures thereof. Mixtures of water with metals are prepared in the form of aerosols. The vapor-gas mixture is pumped out. 1 il. S a

Description

The invention relates to the mining sector and can be used in the mining industry for mine-free mining of coal and other combustible minerals, by means of their gasification in situ.

The purpose of the invention is to improve the quality of the gas-vapor mixture by reducing the methane content.

In order to understand the essence of the proposed method, it is necessary to consider the following, and not the reaction of the gas generating process:

0

five

termination of the underground generator.

However, there is a fundamentally different way to reduce the formation of methane and to increase the generation of CO and H even at low temperatures and high pressures. This way constitutes the essence of the proposed method: it is based on the introduction of metals into the firing zone of the hydrosols, which activate CO and H generation and suppress the generation of CH.

It was established experimentally that in the presence of iron sols, even at 450 ° C, the reaction

C + CO,

2 WITH

С + N. О СО + Н,

WITH + ZN ,,, +

2CO + + COj

Reactions (1) and (2) proceed with the absorption of heat, the poet, and to shift them to the right, it is necessary to raise the temperature and decrease the pressure. Reactions (3) and (4) in the same direction shift with decreasing temperature) and increasing pressure.

Therefore, the first condition for the intensification of the formation of H and CO, also a decrease in the share of CH is b: an increase in temperature. This condition is observed in the prototype method, which provides for a temperature increase at the firing face not lower. However, at an air blast, such a high temperature is not always sustainably maintained, hence the reduction in the quality of the gas-generating gas, the decrease in its calorific value.

The second condition for the intensification of the formation of H and CO, as well as reduced: 1 share of CH is the low pressure of the vapor-gas mixture at the firing face. At pressures of 0.1–0.3 MPa, the generation of H and CO sharply increases, and methane is practically not formed. This condition is not observed in the prototype method, so even at 1500 ° C up to 10% of methane is formed. However, the observance of this condition is difficult, since at low pressures at the firing face sharply the conditions of gas circulation worsen, which can lead to

+ CO

C0 „+ N.

(five)

20

In the presence of nickel or cobalt sols at 760-800 ° C, the reaction is shifted to the right.

+

CE,

CO, + 4H

2

(6)

25 and at 1200-1400 ° С - also reaction

Hjo +

CH,

: CO + ZN,

(7)

0

five

0

five

0

five

The cost of preparing hydrosol is negligible. To obtain 1 liter of Ni, Co or Fe hydrosol, you only need to

4-5 g of these metals with particle sizes in the order of 0.1-0.001 mm.

The drawing shows a diagram of the coal seam gasification.

The scheme includes a well 1 for air and air-oxygen blowing, a well 2 for removal of the vapor-gas mixture 3 formed, a well 4 for supplying hydrosols 5 to the set up space, a fire slab b and a gasification boiler 7 in the coal seam 8.

The coal seam is opened by three wells (or three groups of wells) 1, 2 and 4. Between the wells 1 and 2 they form a boiler 7 (using a hydraulic fracturing or burning coal seam 8). The coal seam is ignited and the firing face 6 is formed with the help of blowing through the well 1. Then, through the well 4, a hydrosol 5 is fed in the opposite direction to the firing face 6.

The gas-vapor mixture 3, in which, under the influence of Ni, Co and Fe sols, CO and H generation reactions actively take place, is withdrawn along well 2. After the section of the reservoir has been developed.

Claims (1)

contoured wells 1 and 2, proceed to gasification of the next section. In this case, well 2 is used already to supply hydrosol to the exhausted space, and well 1 is used to drain the vapor-gas mixture. Invention Formula The method of underground coal gasification involving the opening of the reservoir by wells, the creation of a well-reaction channel between them, the supply of air oxygen blowing towards Hydrozo / tb J H20,, co, F € / ;;, SHSh 3920854 the fire face, the flow into the burnt out zone from the water surface in the direction of the fire face and the evaporating gas-vapor mixture, characterized in that, in order to improve the quality of the vapor-gas mixture while reducing energy consumption by reducing the methane content, is mixed with nickel or cobalt, or iron, or their mixtures, while mixtures of water with metals are prepared in the form of hydrosols. ten Gas Autye L / WA I .