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GENERATOR SEAL OIL SYSTEM

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   1:- Introduction of generator seal oil system.    2:- Calculation & parameters for example.    3:- DCS snap view & some important images. INTRODUCTION / GENERAL DESCRIPTION 1:- A turbo generator for a generating unit  can not operate without this system. 2:- It prevents the leakage of gas (Hydrogen or Carbon dioxide) along the generator rotor shaft where it passes through the casing. 3:- To prevent hydrogen coming into contact with oxygen in the atmosphere (hydrogen oxygen mixture is highly explosive). 4:- Hydrogen leakage is prevented by providing gas tight housing at the generator end shields (mounted between end shields bearing either end of the stator). 5:- Some gas leak through the annular gap between shaft and stator housing, to prevent hydrogen leakage from this gap, high pressure oil film is provided continuously. 6:- So the shaft se...
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HPBP & LPBP

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HP Bypass Station 1:- HP/LP bypass system can handel 60% of boiler load. 2:- HPBP valve is a combined pressure reducing and desuperheating station valve 3:- Spray water is tapped from BFP discharge  and spray controled by spray control valve. 4:- HPBP dumps the depressurised and desuperheated steam with suitable parameter into CRH line. 5:-Can operate without coordinate with turbine. 6:- Allows quick raising of steam parameters at a level acceptable to turbine for rolling operqtion during start up. 7:-Oil supply unit is installed for operation of HPBP & LPBP valves  8:-Supply oil pressure is maintained at 160 kg/cm2 by the pump and accumulator unit. Modes of HP Bypass Operation 1:- Boiler start-up with TG set at stand still. 2:- Rising of steam parameters to a level acceptable to turbine for rolling. 3:- Turbine start-up and loading while steam flow gets transferred to the turbine 4:- Parallel operation with turbine on load rejection. 5:- Allowing boiler...
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Furnace Safeguard Supervisory System (FSSS)

Introduction :- The Furnace Safeguard Supervisory System (FSSS) is designed for  To assure the execution of a safe, orderly operating sequence in the start up & shut down of fuel firing equipment. To prevent errors of omission and commission in following such a safe operating procedure. The system provides protection, should there be a malfunction of fuel firing equipment and associated air systems. The safety features of the system are designed for protection in most common emergency situations. Basic Functions of FSSS:- Prevent any fuel firing unless a satisfactory furnace purge sequence has first been completed.  Prevent start-up of individual fuel firing equipment unless certain permissive interlocks have first been satisfied.  Monitor and control the proper component sequence (manual or automatic) during start-up and shutdown of fuel firing equipment. Make continued operation of fuel firing equipment subject to certain safety interlocks remaining satisfied. ...
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