CONDENSATE EXTRACTION PUMP (CEP) IN A THERMAL POWER PLANT

-

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 the turbine hall. Two pumps is required to run on the full load of turbine and one pump mill remains 50% stand by.
  • This group is characterized as having bearings lubricated with the pumped liquid.
  • These pumps are popular in multi-stage construction.
  • The impellers discharge into a vertical support column housing the rotating shaft.
  • These pumps are often installed into deep well water applications.
  • The impellers are commonly mixed flow types, where one stage feeds the next stage through a bell shaped vertical diffuser.
  • Electrically powered  (6.6 kV)centrifugal pumps.

FUNCTION:-

Condensate pump takes suction from condenser and delivers condensate water to deaerator through main ejectors, gland coolers and L.P.heaters.

TECHENICAL DATA FOR A CEP IN A 200 MW UNIT:-

PUMP           

Multistage (9 stage), vertical turbine type centrifugal pump, low specific speed.

Medium head

Medium capacity

Direction of rotation: clock wise viewed from motor end.

Type: BHRC 28

Size 300x250

Discharge:  281 tons/hour

RPM: 1489

BHP: 256

Motor HP: 300

CAUTION: not to run bellow 193 M barometric heat.

MOTOR:

3 phase, 50 Hz, cosΦ=0.84

Voltage: 6600v

Power 220KW, H.P.:300

Weight : 3000kg

Line diagram of a power plant



 ***


Comments

Post a Comment

Popular Posts

HPBP & LPBP

-
Image
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 operatio
Read more

APRDS in THERMAL POWER PLANT

-
Image
OBJECTIVE Auxiliary steam is the steam that is required for various auxiliary requirements in a power plant. A part of main steam is tapped off for auxiliary steam station from MS/CRH line, after pressure reducing and de-superheating up to 16 Kg/cm 2   & 320 °C. At the HT header (16 16 Kg/cm 2    & 320⁰C) and then at the LT header (16 Kg/cm2 & 210⁰C) through desuperheater b/w the HT & LT headers. Spray water quantity required for the temperature reduction of the steam is controlled by separate spray water valve (taken from CEP discharge). TYPES OF STATIONS System consists of  two auxiliary  steam pressure reducing and desuperheating stations (APRDS). High capacity PRDS (LTPRDS)  with tapping off steam from main steam line or CRH line . Low Capacity PRDS(LTPRDS)  from HT header. APRDS SERVICES Auxiliary steam system is designed to provide steam for following systems. 1:-  Turbine  &  Turbine auxiliaries . 2:-  Boiler auxiliaries . 3:-
Read more