METHOD OF COMBUSTION PROCESS IN FURNACE PLANTS WITH GRATE Russian patent published in 2020 - IPC F23B80/02 F23B10/00 F23G5/16 F23L7/00 

FIELD: physics.

SUBSTANCE: invention relates to the field of power engineering. Disclosed is method of combustion process for furnace plants with grate, in which amount of gas for primary combustion is passed through fuel into zone of primary combustion and in rear grate zone part of offgas flow is pumped and this part of offgas flow is again supplied to combustion process as internal recirculation gas. In primary combustion zone reaction conditions are set from stoichiometric to highly non-stoichiometric from λ=1 to λ=0.5, and into the afterburning zone, which in the flow direction is located after the primary combustion zone, internal recirculation gas is fed. Fuel is gasified on gasification grid, on incipient afterburning grid ensured complete combustion of slag and in the afterburning zone complete combustion of gas is provided due to that therein internal recirculation gas is supplied to exhaust gas flow for complete combustion of these gases to achieve air excess coefficient value from λ=1.1 to λ=1.5. In the first channel for off-gas, in addition to this part of off-gas flow pumped out in the rear grate part, secondary air is not supplied and, thus, another gas of recirculation is not supplied. Flue gas residence time at temperature over 850 °C after the last supply of internal recirculation gas is at least 2 seconds. Said swirling gas is fed in flow direction downstream of primary combustion zone to create turbulence.

EFFECT: higher quality of fuel combustion and reduced emission of hazardous substances.

5 cl, 13 dwg