METHOD TO PREPARE POWER GAS OF UNDERGROUND GASIFICATION OF STONE AND BROWN COALS Russian patent published in 2012 - IPC E21B43/295 

FIELD: mining.

SUBSTANCE: method includes primary cooling of gas in a well of an underground gasification rig using supply of sprayed water into a wall or a recuperative boiler, in which cooled gas and cooling water are separated with a wall, forced gas suction from the well, its cleaning and burning to produce heat and power energy. Primary gas cooling is carried out to the temperature of not less than 600°C. At the same time gas cleaning from dust is carried out by dry method at one, two or three stages, combining a cyclone device, a cyclone device of battery type, an electric filter or a cassette filter from gauze nets. Gas supply for burning is carried out at the temperature that is higher than temperature of stone coal resin condensation, i.e. not below 400°C.

EFFECT: improved ecological parameters of power gas preparation process, reduced capital costs for arrangement of a complex ground part and improved process parameters of power gas burning process.

2 dwg