FUEL PREPARATION AND COMBUSTION CIRCUIT (EMBODIMENTS) Russian patent published in 2023 - IPC F23K1/00 

FIELD: thermal power engineering.

SUBSTANCE: invention can be used in boiler technology. The fuel preparation and combustion circuit includes a raw fuel tank with a feeder connected by a crude fuel supply pipeline to a dryer pipe and a drying agent path, a mill with a separator, the upper part of which is connected through a primary air duct to the combustion chamber burners located above the fluidized bed grate, whereas the lower part of the separator volume is connected to the mill by a pipeline for partial return of the coarse fraction to the final mill, the flue gas duct is connected to the hot air duct and then to the drying agent path, and the blower fan is connected to the air heater, and the hot air duct is connected to the hot air high-pressure blower connected to the fluidized bed grate, as well as to the burners and the drying agent path. The separator is separated from the mill to a height that ensures the transport of coarse dust to the lower part of the volume of the combustion chamber, and the lower part of the volume of the separator is connected through a coarse fraction pipeline with an additionally installed tank with a feeder and further, through a coarse fraction pipeline, to the lower part of the combustion chamber, above the fluidized bed grate, moreover, on the dust pipeline of the grinding product connecting the mill and a separate separator, an additional separation device is installed behind the mill.

EFFECT: group of inventions makes it possible to simplify the design of the boiler, reduce the aerodynamic resistance of its gas path and thereby increase the efficiency of the boiler.

3 cl, 2 dwg