THREE-STAGE METHOD OF COMBUSTION IN A BOILING LAYER OF HIGH-ASH FUELS Russian patent published in 2018 - IPC F23C10/00 F23B10/00 F23C6/04 

FIELD: power engineering.

SUBSTANCE: invention relates to heat power engineering and can be used in combustion of high-ash coals in a fluidized bed, for example, high-ash coals of Ekibastuz Basin of Kazakhstan and a number of Russian deposits. Method for burning solid fuel in a fluidized bed, comprising feeding a pulverized fuel to a first stage boiling bed furnace, solid volatile products of combustion of which are divided into volatile coarse fractionation and fly ash, the volatile coarse fractionation is directed to combustion in the second stage boiling furnace, fly ash is sent to the third stage boiling furnace, and the furnaces of the fluidized bed of the second and third stages are arranged sequentially along the movement path of the solid volatile particles in the furnace.

EFFECT: improving economical efficiency of the fluidized bed furnace operation while burning high-ash fuels by increasing the ash content of the combustion products.

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