SYSTEM OF DUST AND GAS SUPPRESSION, VENTILATION AND FIRE EXTINGUISHING DURING LARGE SURFACE AND UNDERGROUND EXPLOSIONS, AUTOGENIC AND OPEN FIRES AT OBJECTS DIFFICULT TO ACCESS AND LARGE AREAS Russian patent published in 2015 - IPC E21F5/14 

FIELD: mining.

SUBSTANCE: invention relates to mine industry, and can be used to control dust and gas content in case of coyote blasts in mines and at borrow pits in rocks of any strength category and watercut degree, and during fire extinguishing of large areas of difficult to access fixed objects. The dust and gas suppression, ventilation and fire fighting system is suggested for mines, it contains: first block comprising mine field with spent chambers and mine tunnels, borrow pit, aquifer, drain system connected in single system, having outputs to open space; at least one second block to form three-phase flow, installed at output to the open space and comprising the ejector device, they contain turbocharger, cryogenic plant, pressure accumulator, cryogenic chamber with build-in at output Laval nozzle; third block to control sequence of switching on of the system assemblies. At that the spent chambers are connected with the aquifer and are tanks to store water supplied to the ejector plant to form the three-phase screen above blasts of the dust-gas discharges and/or for three-phase mixture delivery to the fire spot. Also method of dust-gas suppression is described with use of the said system.

EFFECT: increased degree of dust and gas suppression during large coyote blasts and ventilation of the deep borrow pits and mine tunnels.

14 cl, 6 dwg