METHOD OF UNDERGROUND GASIFICATION OF COAL Russian patent published in 2023 - IPC E21B43/295 

FIELD: mining industry.

SUBSTANCE: present invention relates to the methods for underground coal gasification. A method for underground gasification of coal is claimed, including the determination of the area of the deposit to be mined and the construction of an underground gas generator. The method includes the following steps: drilling along the strike of the coal seam one inclined-horizontal well of the ignition row, which serves as the lower boundary of the gas generator; two vertically inclined blast holes are drilled from the surface to the entrance to the coal seam, continuing along the dip of the coal seam to the intersection with the inclined horizontal well of the ignition row and serving as the lateral boundaries of the gas generator; one vertically inclined well is drilled from the surface to the entrance to the coal seam along the dip of the coal seam to the intersection with the inclined horizontal well of the ignition series, which serves to remove the resulting synthesis gas; two vertical wells are drilled to ignite the bottom hole of the gas generator and to fire the initial gasification channel; means are introduced into the blast wells and delivered to the ignition points for smooth transfer of the blast supply point; ignition is done at points representing the point of intersection of the inclined-horizontal wells of the ignition series with wells blowing through vertical wells designed to ignite the bottom hole of the gas generator; compressed air is injected to the wells of the inclined-horizontal ignition row, two vertically inclined blast and two vertical wells intended for ignition of the gas generator bottom hole; after debugging the operating conditions of the gas generator, synthesis gas is pumped out for previously defined energy or coal-chemical purposes through one vertically inclined well, which serves, respectively, to remove the resulting synthesis gas.

EFFECT: ensuring a constant composition of synthesis gas, increasing its calorific value, utilizing coal-bed methane, bury carbon dioxide and using it as a reagent to increase the calorific value of the resulting synthesis gas, increasing the suitability of the latter for further processing into raw materials for chemical production, reducing the scope of drilling operations and material consumption of production.

15 cl, 3 dwg