ARRANGEMENT OF LOW-TEMPERATURE HEATING SURFACES IN A RECOVERY BOILER Russian patent published in 2020 - IPC F22B31/04 

FIELD: waste processing and disposal.

SUBSTANCE: invention relates to a chemical waste heat boiler having a furnace for burning spent liquor and a gas duct comprising vertical channels for furnace gases, at least in part of which there installed are heat recovery devices for flue gas heat recovery. Heat recovery devices have a width substantially equal to the width of the gas duct, wherein in the fuel gas above the furnace after the furnace a superheater is installed. In addition to superheater in first channel for furnace gases one of following heat recovery devices is installed: economiser, boiler unit or heater. Superheater and second heat recovery device are located one after another in horizontal direction of furnace gases inlet, therefore in the channel flue gases flow downwards in vertical direction and simultaneously the superheater and the second heat recovery device are heated. Also elements of heating surface of superheater and second heat recovery device are arranged parallel in direction, which is transverse to horizontal input direction of furnace gases.

EFFECT: this allows reducing the need to increase boiler building dimensions.

12 cl, 7 dwg