POWER STEAM BOILER Russian patent published in 2002 - IPC

FIELD: steam generation in steam-turbine plants. SUBSTANCE: boiler has multiple-stage water economizes and steam superheater with steam temperature controlled by spraying own condensate, and also condenser communicating with boiler drum through condensate drain line running to drum that incorporates shutoff element and water seal. Tee-piece is mounted in boiler on feedwater line downstream of supply unit and has shutoff elements at its outlet to ensure feedwater supply either to first stage of economizer or to condenser; Tee-pieces are also installed at inlet and outlet of condenser, at inlet and outlet of first economizer stage, and at inlet of second economizer stage; valves installed on both ends of Tee- piece disposed at outlet of first economizer stage provide for water supply either to inlet of second economizer stage or to condenser inlet; valves installed on both ends of Tee-piece disposed at condenser outlet ensure water supply to inlet of second or first economizer stage. EFFECT: reduced temperature of stack gases; reduced metal input; enhanced reliability of boiler. 1 dwg