Brighton 'B' Power Station - Page 4

 

 

Turbo-Alternator Feed

Heating & Condensing Plant

 

The six turbo-alternators were arranged longitudinally in the turbine house. Four, having a capacity of 55.5 MW were of the three cylinder type with single flow H.P. cylinder, single flow I.P, and double flow L.P, cylinder with the alternators air cooled. The last two turbo-alternators had a capacity of 60 MW and were of a two cylinder type with single flow H.P. cylinder and single/double flow I.P. combined with quadruple flow L.P. cylinder.

 

Turbine room, looking west

The steam conditions at the H.P. turbine stop valve were 900 Ibs/sq. in, and 482"C (900"F). The generators operated at 3,000 RPM and the two 60 MW sets were cooled by hydrogen at a pressure of 0.5 Ibs/sq. inch. The rated terminal voltage was 11.8 kV at a power factor of 0.8. Main and pilot exciters were direct-driven from the generator shaft.

 

The condensers were twin shell, two flow, surface type designed to maintain a vacuum of 29" Hg when supplied with 45,000 galls/min. of cooling water at 15"C and condensing 340,000 Ib. of steam per hour. Two 100% duty, three stage, steam jet air ejectors extracted air from the condenser.

 

After passing through the turbine the steam exhausts into a condenser, and again becomes water which is returned to the boiler.

 

Two 100% duty extraction pumps delivered condensate to the three L.P. stages of feed heating from which it passed to a de-aerator. The condensate then discharged to a de-aerator extraction pump before passing to the main boiler feed pump and three high pressure feed heating stages.

 

Circulating Water System

 

The "B" Station required approximately 280,000 galls/minute of the sea water for condenser cooling under full load conditions.

 

One of the two boiler make-up water treatment units.

 

This was normally pumped from the tidal side of the harbour locks and discharged, after use, to sea. It could, however, be diverted into the eastern (locked) arm of the harbour and this was done in order to maintain the level required by the Harbour-master in this section, i.e. to make up losses including water used for locking operations.

 

 

 

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