TECHNICAL DATA

1.          INTRODUCTION

GENERAL

Type of station

 

Thermal

Fuel

 

Residual fuel oil

Output

Main turbines

2 x 500 MW

 

Gas turbine plant

2 x 25 MW

Grid connections

 

2 x 1000 MVA, 275 kV lines to Capenhurst sub-station

OPERATING CONDITIONS

Boiler CMR flow

447 kg/s

Steam at HP stop valve

159 bar at 538 oC

Steam at IP stop valve

38 bar at 538 oC

Condenser pressure

60.96 mbar abs

Final feed temperature

252

Generator rating

22kV

Generator power factor

0.85

Generator output

588 MVA

Hot run-up rate

21 min to CMR

Cold run-up rate

330 min to CMR

CIVIL

Site area

50.6 ha (125 acres)

Site datum

+7.5 m O.D.

Boiler house dimensions

102.5 x 49.5 x 61 m high

Turbine house dimensions

123 x 60 x 32 m high

Cooling tower height

116.7 m

Chimney height

152 .5 m

Flue diameter

12.5 m tapering to 7.6 m

FUEL

Residual fuel oil from tanker berth on Manchester Ship Canal or by pipeline from Stanlow Oil Refinery.

Gross calorific value

41.9 to 43.5 MJ/kg

Net calorific value

39.3 to 40.9 MJ/kg

Viscosity

6.6 to 115 centistokes

Specific gravity

0.9 to 0.995

Ash (by weight)

0 to 0.15%

Consumption (CMR per Unit)

108.6 tonne/h

Main oil tanks

3 x 46,000 tonne

2.       MAIN BOILERS

General

Clarke Chapman Ltd, forced-circulation radiant type membrane-walled furnace and rear enclosure; horizontal primary, and pendant secondary superheaters and reheaters; horizontal continuous tube multi-loop extended surface economiser. Firing is from the front wall. The Units are designed to operate continuously, or a two-shift basis.

Operating Conditions at Boiler CMR

 

Evaporation rate

447.3 kg/s

Superheater outlet conditions

166.5 bar at 541 C

Reheater steam flow

365 kg/s

Reheater inlet conditions

42 bar at 348 C

Economiser inlet conditions

184.6 bar at 252 C

Economiser outlet temperature

40.3 bar at 541 C

Drum working pressure

181.7 bar

Gross thermal efficiency

88.85 %

Spray water temperature

141

Burner oil flow

32 x 1.115 kg/s

Burner oil temperature

120 to 150 C

Air flow

1593 tonne / h

Chimney exit speed

26.7 m/s

 Physical Details

Maximum design pressure

191.7 bar

Water content (cold) at NWL

195.5 tonne

Drum size

28.1 m x 1.52 m dia.

Drum thickness

107.95 mm

Maximum lift (drum)

150.4 tonne

Safety valve settings

 

 

drum

190.3 bar

 

superheater

173.4 bar

 

reheater inlet

51 bar

 

reheater outlet

47.6 bar

Safety valve type

Dewrance ‘Maxiflow’

 

I.D. Fans

 

Fan

Davidson & Co. Ltd., two per Unit, inlet guide vane controlled.

Motor

 Laurence-Scott & Electromotors Ltd., air cooled, squirrel cage, single speed, induction motor

Volume rating

301.9 m3/s

Speed

740 rev / min

Motor power

2670 kW at 11 kV

Gas conditions at inlet

35 mbar at 43 C

Running diameter

3.38 m

 

F.D. Fans (as I.D. fans except for) –

 

Volume rating

207 m3/s

Speed

740 rev / min

Motor power

1842 kW at 11 kV

Gas conditions at inlet

37 mbar at 32 C

Running diameter

2.9 m

 

3.       MAIN TURBINE

C.A. Parsons & Co. Ltd., five cylinder, tandem compound, single reheat, 50% reaction turbine, with single-flow H.P., dual-flow I.P. and three dual-flow L.P. cylinders, mounted on a concrete plinth. Mechanical hydraulic governor using lubricating oil as the power fluid.

 

CMR Conditions

 

Rating

500 MW; 588 MVA

Power factor

0.85

HP stop valve conditions

159 bar at 538 C

HP exhaust conditions

42.1 bar at 538 C

IP inlet conditions

38 bar at 538 C

Cycle efficiency

43.01 %

Steam consumption

434 kg/s

Lubricating oil capacity

41.8 m3

Oil flow

128.8 litres / s

 

11          ASSISTED DRAUGHT COOLING TOWER

One tower serves both Units.

Normal generation on natural draught

600 MW (at design temps)

Maximum generation on natural draught

950 MW

Tower height

116.7 m

Tower diameter podium / base / top

172 / 96.5 / 54 m

Podium height

14 m

Assisted cooling by 35 fans, each 588 m3 / s and 212 kW:

17 fans by Keith Blackman

135 rev / min

six blades

8.4 m dia.

18 fans by Edgar Allen Aerex

70 rev / min

twenty blades

8.4 m dia.

Air flow per cell

588 m3 / s

Water flow per cell

0.93 m3 / s

Total water flow

32.6 m / s

Total fan power

6.9 MW

 

14      GAS TURBINE PLANT

Two Units, each with 2 Avon gas generators driving an a.c. generator via one power turbine.

Manufacturer

G.E.C. Gas Turbines Ltd.

Type

Twin Avon gas generator (1533-75L)

Output per Unit

25.4 MW

A.C. generator

3000 rev / min, 11 kV, 0.8 power factor

Gas generator speed CMR

7900 rev / min

Mass gas flow

158 kg / s

Fuel consumption per Unit

3 litre / s

Fuel viscosity

34 cSt

Fuel tanks

3 x 3010 m3 (2570 tonne)

Power turbine

2 – stage

Overall efficiency

28 %

Chimney height (2 off, steel)

45 m

 

24          COMPUTER

GEC 2050 type, two Unit computers, each with two processors.

March 4 peripherals

3 loggers, IBM type 735 per Unit