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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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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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CONDENSATE EXTRACTION PUMP (CEP) IN A THERMAL POWER PLANT

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CONDENSATE EXTRACTION PUMP (CEP) Its Importance in Thermal Power Plant It handles water from hot well. The characteristic of that pump is that it handles water from vacuum.  Berceuse the condenser and the hot well are in vacuum bellow atmospheric pressure. No other pump has this characteristic to handle in such condition. It takes water from vacuum pressure and delivered above atmospheric pressure.   It is a vertical turbine type pump which is multi stage. It deliver water from hot well to deaerator. They may be used to pump the condensate produced from latent water vapors in any of the following mixtures: Steam condensed (exhaust from LP turbine) in condenser Make up water (dumped in condenser hot well from condensate storage tank) Flash box water LPDFT water HPDFT water Drip from ejector Drip from LPFWH   CEP for a 200 MW unit:- Each unit has been equipped with three nos. of condensate pumps installed vertically at minus four meter level in to...
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