FIELD: heating equipment.;SUBSTANCE: group of inventions relates to regenerative boiler device. Device comprises a furnace for combustion of waste liquor and a flue gas duct, comprising vertical channels of flue gas, some of them are equipped with heat recovery units for heat recovery from flue gases. Flue gas channel first after the furnace is equipped with a heater and one of the following heat recovery units: an economizer or a boiler accumulator. Heater and second heat recovery unit are located one after another in horizontal direction of flue gas inlet so that in flue gas channel flue gas flows in vertical direction from top to bottom and simultaneously heats heater and second heat regeneration unit. According to the other device, the heater heat regeneration elements and the second heat regeneration unit are located one next to the other in the direction, which is transverse to horizontal direction of flue gas inlet.;EFFECT: technical result is creation of device for heat recovery from flue gases formed during spent liquor combustion.;10 cl, 5 dwg
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