DEAERATOR

THE CONDENSATE WATER FROM L.P.HEATER OUTLET IS ADMITTED AT THE TOP OF THE DEARATING COLUMN AND FLOWS DOWNWARDS THROUGH THE SPRAY VALVES AND TRAYS.THE TRAYS ARE DESINED TO EXPOSE TO THE MAXIMUM WATER SURFACES FOR EFFICIENT SCRUBBING TO EFFECT THE LIBERATION OF THE ASSOCIATED GASES.STEAM IS ALLOWED TO ENTER FROM THE UNDERNEATH OF THE TRAY AND FLOWS IN THE COUNTER DIRECTION OF CONDENSATE WATER.WHILE FLOWING UPWARDS THROUGH THE TYAYS SCRUBBING AND HEATING IS DONE.THUS THE LIBRATED GASES MOVE UPWARDS ALONG WITH THE STEAM.STEAM GETS CONDENSED ABOVE THE TYAYS AND IN TURN HEAT THE CONDENSATE WATER.LIBRATED GASES ESCAPE TO ATMOSPHERE FROM THE ORRIFICE OPENING MEANT FOR IT.THIS OPENING IS PROVIDED WITH NUMBER OF DEFLECTOR TO MINIMISE THE LOSS OF STEAM.

CONDENSATE PUMP

CONDENSATE PUMP TAKES SUCTION FROM CONDENSER AND DELIVERS CONDENSATE WATER TO DEARATOR THROUGH MAIN EJECTORS,GLAND STEAM COOLERS AND L.P.HEATERS.CONDENSATE WATER DISCHARGED BY THE CONDENSATE PUMP IS ALSO UTILISED FOR THE SEALING OF VALVES WITH GLANDS,FOR PRDS AND DD TEMPCONTROL OF MAIN STEAM LINES AND HOT REHEAT LINES RESPECTIVELY,FOR FILLING SYPHONS OF EJECTORS AND SYPHON DRAIN EXPANDER,CONDENSATE WATER FROM INTERMEDIATE STAGE OF PUMPS IS UTILISED FOR FORCED CLOSING OF NON RETURN VALVE OF TURBINE STEAM EXTRACTION LINES AND FOR GROUP PROCTION DEVICE FOR BY PASSING OF H.P.HEATERS AND FOR COOLING DOWN THE STEAM DUMPED IN STEAM THROW OFF DEVICE BUILT IN BOTH CONDENSER.

BOILER FEED PUMP

DURING NORMAL RUNNING OF UNIT THE FEED PUMP HAS TO HANDLE HOT WATER RECEIVED FROM FEED WATER STORAGE TANK OF DEARATOR THROUGH ITS BOOSTER PUMP ENHANCING THE POSITIVE SUCTION PRESSURE AND HAS TO DELIVER THE HOT WATER UNDER HIGH PRESSURE TO BOILER DRUM THROUGH HIGH PRESSURE HEATERS AND ECONOMISER FROM STEAM GENERATION.THE FEED PUMP MAY BE TREATED AS THE HEART OF THE UNIT AND THEREFORE FULL ATTENTION IS TO BE PAID DURING ITS STARTING UP SHUTTING DOWN AND NORMAL RUNNING.FEED WATER DELIVERED BY THE FEED PUMP IS ALSO UTILISED IN THE PLANT FOR THE TEMPERATURE CONTROL OF AUXILIARY PRDS STEAM,FOR TEMPERATURE CONTROL OF SUPERHEATED STEAM AND FOR TEMPERATURE CONTROL OF REHEAT STEAM.

GOVERNING AND PROTECTION SYSTEM OF TURBINE

THE TURBINE IS EQUIPPED WITH HYDROMECHANICAL SYSTEM OF AUTOMATIC GOVERNING WHICH ENSURES SMOOTH AND STABLE OPERATION OF THE TURBOSET UNDER ALL CONDITIONS OF OPERATION.THE SYSTEM IS CAPABLE OF SUSTAINING FULL LOAD DUMP FROM THE GENERATOR WITHOUT THE OPERATION OF PROTECTION SYSTEM AND THUS ENABLES QUICK RELOADING OF THE TURBOSET.SPEED GOVERNOR-THE PRINCIPAL SENSING ORGAN IS DIRECTLY COUPLED TO THE TURBINE ROTOR THROUGH A GEAR COUPLING AND HAS BEEN SO DESIGNED TO MAINTAIN AUTOMATICALLY THE SPEED OF THE TURBOSET WITHIN THE STATIC SPEED REGULATION OF 4.1PERCENT.THE SPEED GOVERNER IS HYDRAULICALLY LOCATED WITHIN THE FRONT BEARING PEDESTAL.