FLUIDISED BED FUEL COMBUSTION METHOD AND DEVICE Russian patent published in 2010 - IPC F23C10/12 F23C6/04 

FIELD: power engineering.

SUBSTANCE: fluidised bed fuel combustion device includes reactor having lower and upper zones, device for fuel feeding to upper zone, device for supplying primary compressed air flow to lower zone, air-distributing grid installed in upper part of lower reactor zone, chamber located under air-distributing grid and connected to non-combustible component discharge device; at that, inner surface of upper zone is made in the form of inner side surface of rotation body, and outlet hole is made in upper edge of reactor coaxially to the above inner side surface. Upper reactor zone is divided into combustion zone and afterburning zone; at that, inner surface of combustion zone is cylindrical and it is located between low reactor zone and afterburning zone restricted with upper edge of reactor; at that, combustion zone and afterburning zone are connected by means of cylindrical channel, and each zone has device for tangential supply of secondary compressed air, which is connected with one or several tangential nozzle channels to inner surface of the appropriate zone; at that, device for supplying secondary compressed air of combustion zone is located in its upper part, and device for supplying secondary compressed air of afterburning zone - in lower part of afterburning zone; at that, fuel feeding device is connected to upper part of combustion zone. Diametre of inner surface of afterburning zone in section of location of device for supplying secondary compressed air is equal to 0.4-0.8 of diametre of inner surface of combustion zone. Inner diametre of cylindrical channel connecting combustion zone and afterburning zone to each other is equal to 0.5-0.8 of diametre of inner surface of afterburning zone in section of location of device for tangential supply of secondary compressed air. Inner surface of afterburning zone is cone-shaped and has opening angle of 0-12 degrees in direction of upper reactor edge. In devices for tangential supply of secondary compressed air of combustion zone and afterburning zone, channels are directed to one and the same side.

EFFECT: improving fuel combustion efficiency.

10 cl, 3 dwg