FIELD: boiler engineering. SUBSTANCE: boiler unit has air heater 1, burner unit 2, transfer air duct 3 between them, fuel line running to burner unit, recuperator 5 for heating fuel by hot air, injector 6 for feeding steam-water mixture to cold air flow, and also gate 7 for limiting air feed to burner unit during its firing. Fuel and air are heated in boiler unit to same temperature level higher than or equal to 150 C. EFFECT: improved design. 1 dwg
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