|
|
350 MW (3 x 117 MW) STEAM TURBINE POWER
PLANT
|
|
- 3 x 117 MW gas/oil fired steam generating units
- Dual-fuel burners ā€” HFO / natural gas (1990ā€™s)
- Manufactured 1974
- Shut down 2008/2009
|
Boilers
Manufacturer
Type
Normal output
Max. Evaporation @ MCR
|
|
Babcock & Wilcox
Radiant Natural Circulation
117 MW
825,000 lbs/h
|
|
Turbine Generators:
|
Manufacturer
Type
Speed |
|
AEI
horizontal, close coupled, tandem compound, reheat, impulse
3,000 rpm
|
|
Condition
- Very good, planned operation to at least 2012 and maintained
accordingly
- still installed
- Availability: immediately
- Location: Europe
|
|
| Plant Technical Details |
|
| Boilers |
|
|
Type
Rating
Fuel
Firing Equipment
Oil pumping Plant
Oil Heating Medium
Air Heaters (main)
Air Heaters (aux.)
FD Fans
ID Fans
GR Fans
Controls
|
|
Radiant Natural Circulation
825,000 lbs/hr
1,850 psig, 540 degrees C
Natural Gas ā€” Residual fuel oil as standby
12 off low NOx XCL Gas/oil burners
3 off HP & LP pumps & Heaters per boiler
Aux. Steam
2 off Regenerative
Steam
2 off Centrifugal vane control
2 off Centrifugal speed control via inlet damper
2 off Centrifugal damper control
DCS
|
|
Turbines
|
|
Type
No. of Cylinders
Stages
Speed
Speed Control
Steam Flow
Steam Pressure
Steam Temperature
Reheat Pressure
Reheat Temperature
Turbine Gland Sealing
Bearing Temp. Limits
|
|
Tandem, compound, reheat, impulse/reaction
3
11 HP, 13 IP & 6 double flow LP.
3,000 RPM
Electronic Governor
760,000 lbs/hr
1,800 psig.
540 degrees C
375 psig
540 degrees C
Steam & Water
43 ā€” 49 degrees C
|
|
Generator
|
Max. Continuous Rating
Generated Voltage
Coolant
Excitation
|
|
120 MW @PF 0.8 (lag)
13.8 kV
Hydrogen @ 30 psig
AVR
|
|
| Condenser |
|
|
Type
Capacity:
:Back Pressure
CW Flow
Surface Area
No of Tubes
Tube Material
FEED HEATERS
No of HP
No of LP
|
|
Twin Shell double pass
530,000 lbs/hr
1ā€¯ Hg
65,000 galls./sec.
68,000 square feet
10,400
Aluminium Brass
3
2 + Deaerator
|
|
|
Technical Details ā€” 117 MW Units
The boilers are front-wall fired using natural gas or residual
fuel oil and are a Babcock & Wilcox design. Each boiler has 12
burners and comprises a single furnace compartment with a main and
a rear gas pass, horizontal continuous-loop feed water economiser,
three horizontal and one vertical primary super-heater stages and
two banks of pendant secondary super-heaters with interstage
attemperators, and two pendant banks of re-heaters.
|
|
| Boiler Specification. |
|
Manufacturer
Type
Normal Output
Max. Evaporation @ MCR
Super-heater Out. Press.
Super-heater Out. Temp.
Re-heater Outlet Temp.
Econ. Water Inlet Temp.
|
|
Babcock & Wilcox
Natural Gas / HFO
117 MW
825,000 lb/hr
1,850 psi
541 C
541 C
230 C
|
|
| Induced Draught Fans |
|
|
Number required per unit
Manufacturer
Type
Output Control
Gas Volume Design
Gas Temperature
Motor Details
|
|
2
Davidson & Co Ltd/Harland & Wolff
SI.BAB 122A
V. S. Coupling
200,000 c.f.m. at 160 C and 13.35 in.w.g
150 C
989 rpm 600 H.P. @ 6.6 KV
|
|
|
| Forced Draught Fans |
|
Number required per unit
Manufacturer
Type
Output Control
Air Volume Design
Air inlet suction
Air Temperature at fan inlet
Motor Details
|
|
2
Davidson & Co Ltd/Harland & Wolff
SI.BAB 122A
Constant Speed Vane
122,000 c.f.m. at 27ļ‚°C and18.95 in.w.g.
100% MCR 1.5 in. w.g.
27 C
989 rpm 474 H.P. @ 6.6 kV
|
|
| Gas Recycling Fans |
|
|
Number required per unit
Manufacturer
Gas Volume Design
Output Control
Motor Details
|
|
2
Davidson & Co Ltd/Harland & Wolff
37,400 c.f.m at 321 C and 8.32 in.w.g.
C. S. Damper
985 rpm 140 H.P. @ 400 V
|
|
| Gas Air Heaters |
|
Number required per uni
Manufacturer
Type
Heating Surface
|
|
2
Davidson & Co Ltd/AEI
Rotary
55,200 sq. ft.
|
|
| Steam Air Heaters |
|
|
Number required per unit
Manufacturer
|
|
2
Gibbons Bros. Ltd.
|
|
| Sootblowers |
|
Number required per unit
Manufacturer
|
|
12 plus 4 for air heaters
Diamonds Ltd
|
|
| L.P. Oil Pumps |
|
|
Number required per unit
Manufacturer
Model
Type
Pump outlet pressure
|
|
3
HAMWORTHY ENG. LTD
SHO660 L3
Screw pump
90psi
|
|
| HP Oil Pump |
|
Number required per unit
Manufacturer
Model
Type
Pump outlet pressure
|
|
3
HAMWORTHY ENG. LTD.
SHO.600 M3
Screw pump
650psi
|
|
|
TURBINE Specification
The Associated Electrical Industries (AEI) designed turbine
generator is a horizontal, close coupled, tandem compound, reheat,
impulse type, operating at 3,000rpm, with a stop valve steam
condition of 1,800 psig at 1,000 F (538 C). The turbine is directly
coupled to the generator capable of generating 117 MW of electrical
power at 13.8 kilovolts.
|
|
| HP TURBINE: (11 Stages ) |
|
|
Number required per unit
Steam Conditions
|
|
1
HP Inlet 1,800psig 538 C
HP Exhaust 380psig 346 C
|
| The reverse flow HP Turbine cylinder is of double
shell construction, comprising an inner and outer casing, each
divided and bolted at its horizontal line joint. Each casing is
cast separately in Cr-Mo-V steel. The HP Rotor is machined from a
1%Cr-Mo-V alloy steel forging with eleven blade disc formed
integral with the rotor and bolted to the IP rotor shaft through a
rigid coupling. |
|
| IP TURBINE ( 13 Stages) |
|
Number required per unit
Steam Conditions
|
|
1
IP Inlet, 380psig, 538 C
|
| The IP turbine consists of a single shell
construction comprising a molybdenum vanadium steel inlet and a
cast carbon steel outlet cylinder bolted together. The IP turbine
rotor will be forged in Cr-Mo-V steel with eleven discs formed
integral with the shaft. |
|
| LP TURBINE: (Double flow - 6 stages ) |
|
|
Number required per unit
|
|
1
|
The LP turbine cylinder consists of an inlet
cylinder and two exhaust cylinders, the exhaust cylinders being
bolted to the inlet cylinder front and rear vertical flanges. Steam
enters the inlet midway along the length of the cylinder and
divides in two equal axially opposed flows. Each flow passes
through four impulse stages followed by a Baumann multi-exhaust
comprising the two last stages. The LP rotor is machined from a
Ni-Cr-Mo-V alloy steel forging with an integral half coupling at
each end connecting the rotor to the IP turbine and the
generator.
|
|
| FEED HEATING PLANT: |
|
|
3 HP stages
3 LP stages and Deaerator
Each Feed Heater will comprise a heater shell, a tubenest
assembly and an Inlet and Outlet waterbox. The high level Deaerator
will consist of a cylindrical storage vessel upon which is mounted
a deaerating chamber and a vent condenser.
|
|
| LP HEATERS: (1, 2 & 3) |
|
Number required per unit
Manufacturer
Tube material
|
|
3
AEI
70/30 Brass
|
|
| DEAERATOR: |
|
|
Number required per unit
Manufacturer
|
|
1
AEI
|
|
| H.P FEED Heaters (4, 5 & 6) |
|
|
Number required per unit
Manufacture
Tube material
Final Feed Water temperature
|
|
3
AEI
Cold drawn steel
225 C |
|
| BOILER FEED PUMPS: |
|
|
Number per unit
Manufacturer
Duty
Rated capacity/pump
Discharge Press.
Feed Water Temperature
Suction
Main pump
Motor
Number required per 117MW unit
|
|
3
MATHER & PLATT
3 x 50%
770 gpm
2375psig
126 C
From high level deaerator
twelve chamber plurovane
5,500 rpm (Max)
through a Wellman Bibby coupling.
3000 rpm, 2000 BHP & 6.6 kV.
2
|
|
| CONDENSERS: (twin shell, two flow) |
|
|
Number required per unit
Manufacturer
Number of tubes
Condenser backpressure
Surface area
Steam to Condenser
Cooling water Inlet
Cooling water flow
Outside tube diameter
Tube wall thickness
Tube material
|
|
1
AEI
10,400
29ā€¯ Hg
68,000 sq. ft.
530,097 lb/hr
12.8 C
60,000gpm (with clean tubes)
25.4 mm
18 s.w.g.
Aluminium brass or titanium
|
|
| Generators and Exciters |
|
Generator Rating with hydrogen at 30
psig
Main Exciter rating
Pilot Exciter rating
Permanent Magnet Generator rating |
|
117MW, 150MVA, 0.8 pf lag,13.8kV - 3,000
rpm.
650 kW, 375 V 1.730 amp, 1.007 rpm
20 kVA, 550 V, 21 amp, 1,007 rpm
0.618 kVA, 54 V, 7.14 amp, - 1,007 rpm. |
|
|
|
|
|
|
|
