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CFAS Enterprises Inc.
After Market Utility Power Equipment Brokerage
Mailto:[email protected]
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1 x Unused MHI 250MW STG Inlet 1800 PSIG, 19000 V/3/50Hz 541*C, 3000 RPM
USD $15,.75M
250 Mw Unused Oil-fired Steam Power Plant
A. Steam Generation System
The steam generator is a Mitsubishi Heavy Industries Ltd single reheat drum type
natural circulation, balanced draught, tangentially oil fired unit. Located in the gas
convection pass is a three stage radiant and convection type superheater, a single stage
reheater section and a two bank extended fin economizer. Included with the unit are four
Oraka Blower Mtg Co Ltd, igniter fans, two each Mitsubishi Electric Company gas
recirculating, forced draught and induced draught fans, two steam air heaters, two
Gadelius KK air preheaters and a Mitsubishi Vulcan soot blower system.
Designed for a maximum continuous rating of 825,000 kg of steam per hour
continuously at 139.7 kg/cm• absolute at 541°C and combustion air at 69 °C . An
average superheater and reheater outlet temperature of 541°C is maintained at all loads
from 492,000 kg to 825,000 kg of steam per hour. The steam generator is designed for
operation on residual fuel oil.
Boiler Plant
Manufacturer :
Type :
Mitsubishi Heavy Industries Ltd, Japan
Mitsubishi CE natural Circulation boiler
Radiant, Reheat, Balance Draft and Indoor type.
Number of Unit
Maximum Continuous :
Steam Conditions
820,000 kg/h
(overload 825,000 kg/h)
132.6 kg/cm• (G), @ 541°C
Mitsubishi Heavy Industries Ltd, Japan
Three casing, tandem compound, flow, condensing, single reheat.
250,000 kW
Component specifications are as follows:¬
2. Boiler & Furnace
The steam drum is 1775 mm internal diameter furnished with four Dresser Industrial
Valve and Instrument Division’s safety valves, and two Diamond Power Speciality
Corporation’s bi-colour water level gauges. One gauge is equipped with a liquid cooled
camera and remote mounted monitor for closed circuit tele-viewing of the drum level.
The boiler is 11.5 meters wide, 14 meters deep and approximately 44.5 metres high.
The three stage radiant and convection type super-heater, a single stage reheater
section and a two bank extended fin economizer are located in the gas convection pass.
Seal air is provided for observation doors, soot-blowers, flame scanners and other
fittings requirement cooling because of exposure to hot combustion gases.
B. Turbine Generator And Station Auxiliary Plant
The unit is a Mitsubishi Heavy Industries Ltd, three casing, tandem ¬compound, double
flow, condensing, single reheat steam turbine operating at 3000 rpm. The unit is directly
coupled to a two¬pole, three phase, 50 Hz, 19,000 volts, hydrogen cooled generator.
Field excitation for the generator is supplied by a Mitsubishi Electric Company brushless
excitation system, driven from the main generator rotor and rated at 1500 kW, 420 VDC,
3000 rpm.
Design steam conditions are 124 bar gauge and 538 °C at the turbine stop valves.
Reheat temperature is 538 °C and the design exhaust pressure is 74 m absolute.
The nominal rating of the unit is 250,000 kW at guaranteed steam flow rate of 748,000
kg/h through the stop valves are 124 bar gauge main steam pressure and 76 m absolute
back pressure.
1. Steam Turbine Plant
Maker Type double
Speed Nominal Rating
Steam Conditions at Turbine Valves ¬
Location and Access
The station is sited on 22 hectares of land in a beach front situation, approximately 40
metres inland from the high water line.
The site is serviced by good asphalt surfaced local feeder roads and is only 6 km from
the main inter¬city highway.
The nearest port is approximately 5 km from the site.
The nearest airport is approximately 43 km and 40 minutes drive away, however this
airport is served only by domestic services. The International Airport is approximately 2
hours drive from the site.
Scope of Supply
Steam generator and auxiliaries including a single reheat, drum type natural circulation,
balanced draught, tangentially fired steam generator designed for a maximum
continuous rating of 825,000 kg/h steam at 137 bar (abs.) and 541°C at the superheater
outlet, and 811,400 kg/h steam at 37.2 bar (abs.) and 541°C at the reheater outlet. The
steam generator is designed to burn residual (No. 6) fuel oil. Tilting burners, gas
recirculation and spray desuperheating are provided for temperature control. Other plant
items include seal air system, oil burners, igniters, FD and ID fans, sootblowers steam
air heaters, Ljungstrom regenerative air reheaters, gas recirculation fans, hydrostatic test
pump, continuous blowdown flash tank, atmospheric blow¬off tank and burner cleaning
Steam turbine generator and auxiliaries including a single reheat, tandem compound,
double flow, condensing steam turbine generator operating at 3000 rpm and directly
coupled to a two pole, 3 phase, 50 hertz, 19 kV hydrogen cooled generator. Brushless
field excitation is driven from the main generator rotor. The normal rating of the unit is
250,000 kW. Other plant items include oil pumps, lube oil reservoir, lube oil conditioner,
lube oil coolers, hydrogen seal oil coolers and seal oil system.
Condensate system including single pressure, single pass radial flow, vertically divided,
rectangular bonnet, sea water cooled condenser, steam jet air ejector, inter and after
condenser, first, second and third stage low pressure regenerative feedwater heaters,
deaerator, deaerator storage tank, boiler fill pump and demineralised water storage tank.
Boiler feedwater system including fourth and fifth stage high pressure regenerative
feedwater heaters and three half capacity electrically driven boiler feedwater pumps.
Fuel oil system including main oil storage tanks light oil tank, serpentine heating coils,
fuel tank suction heaters, primary fuel oil pumps, secondary fuel oil heaters, secondary
fuel oil pumps, jet steam atomised oil guns for the main steam generators, fuel oil
transfer pump, primary and secondary fuel oil sump pump sets, and light oil pumps.
Circulating water systems including intake structure recirculating water gates,
straight¬through, band type, travelling screens with wash water system, screen wash
pumps, intake structure sump pumps, cooling water pumps, closed cooling water heat
exchangers, auxiliary cooling water pump, auxiliary cooling water heat exchanger,
circulating water pumps, condensed water box vacuum pump, and sodium hypochlorite
generator system.
Auxiliary steam system including a two drum D type water tube packaged boiler
complete with superheater section, trim, combustion and flame safeguard system, FD
fan, sootblower, auxiliary deaerating heater, fuel oil pump, feed pumps, condensate
pumps, reboiler heat exchanger and reboiler drain pump.
General Description
Two Drum D¬Type Water Tube, Packaged Boiler complete with Super¬heater Section
Trim, Combustion Controls and Flame Safe guard System.
Performance Data ¬Boiler
Maxlmum Design Pressure 26.4KG / CM2 Maximum Operating Pressure 21.0 KG / CM2
Normal Continuous Output 34,636 KG / HR Type of Fuel Burned API No. 6 (residual)
API No. 2 (distillate) Efficiency at NCO 81.7%
(Based upon firing No. 6 oil) Furnace Heat Liberation 1,906,700 KJ / HR / M3 Minimum
Steaming Rate 6,930 KG / HR
Physical Data ¬Boiler
Manufacturer Babcock & Wilcox Canada Ltd. Type FM 13¬79 Total Heating Surface 633
787 M2 (Full Circulation)
Furnace Volume 59. 5 MWeight (Shipped) 57,600 KG Weight (Flooded) 76,600 KG
Tube Size: Outside Diameter 2¬.inch Drum Size: Steam/ Lower (Nominal Dia) 1.07
metres / 0.6 metres Lower Drum Steam Coil: Size / Material / Type 1 • ¬Inch / steel /
Super¬heater Data ¬Boiler Type
Design Pressure Operating Pressure Outlet Temperature at N.C.O. Tube Size: Outside
Diameter Reader Size: Inlet / Outlet (inches nominal)
Accessories ¬Boiler
Drum & Superheater Relief VaIves: Site / Manufacturer Set Pressure Main Steam outlet
stop Check. Size / Manufacturer Feed¬water Stop Check & Regulator Size /
Main Steam Backpressure valve Size / Manufacturer Continuous Blow¬down Valve Size
Manufacturer Lower Drum Blow¬off Valves Size / Manufacturer
Materials ¬Boiler
Boiler Pressure & Casing Parts Steam and Water Valves; ¬Boiler Pressure Steam Valve
¬Reduced Pressure Oil Valves
Forced Draught Fan
Number of Units Spec. Number
General Description
Fan Data
Manufacturer model Number Fan Size Fan Speed Rated Capacity Static Pressure Rated
Temperature Barometric Pressure Fan Power Requirement
Drainable ¬3 pass ¬4 loop ¬13 element
26.4 KG / CM2
21.0 KG / CM2
324 C 2¬inch 10 / 10
(2) 2" Figure 706 Hopkinson
(1) 1 • " Figure 706 Hopkinson 22.8 KG / CM2 Gauge
(1) 8" Figure 2193 Hopkinson
(1) 8" Figure 6003 Hopkinson
(1) 3" Figure 3773 Hopkinson
(2) 3" Figure 2193 Hopkinson Feed water Control Valve supplied with Combustion Controls
(1) 8" Mark I / Valtek with Bailey, Positioner
(2) 1 • " Figure 8736 / Hopklnson
(1) 1 • " Figure 2576/ Hopklnson
Steel Cast or Forged Steel
 1 11021 ¬M ¬227
 Single Width, Horizontal Shaft Centrifugal Fan, Direct Connected Motor with Inlet
Damper, Pedestal Mounted.
 Taylors Limited (NZ.) 730 CP 142 CM 1480 RPM 11,400 Iitres / sec.
 2.73 KPA
 32 c 760 MM HG 39 KW
 Fan Motor Data
 Rating Rated Speed Voltage Phase Frequency Type of Enclosure Insulation
Class Bearings Lubrication
 Burners ¬Boiler
 Number of units Manufacturer spec. Number
 General Description
 Performance Data ¬Oil Burner
 Oil Pressure: Maximum Oil Pressure: Minimum Oil Viscosity (Maximum)
Atomising Steam Pressure
 Atomising; Air Pressure Ignition Power Supply Burner Throat Diameter
 Ignition ¬Burner
 Carbon Arc lgnitor with Air Cylinder Stroke Mechanism lgnltor Manufacturer
 Atomisers ¬Burner
 Number Manufacturer Sprayer Plates
 Soot Blower ¬Boiler
 Number Manufacturer Spec. Number
 General Description:
 Operating Media Source
 1480 RPM 45 KW 400 3 50 HZ TEFC B Ball Grease
 1 Babcock & Wilcox Canada Limited 11021 ¬M ¬227
 Venturi Throat, Forced Draught Type for Oil Firing.
 17.6 KG / CM2
 10.5 KG / CM2 135 SSU
 8.75 KG / CM2
 7.70 KG / CM2 110 VOLT 50 HZ 457 MM
 254mm Travel
 Electronic Corp. of AmerIca (E.C.A.)
 2 Racer 305 MM Dia.
 1 Babcock & Wilcox Canada Limited 11021 ¬M ¬227
Valve¬in¬Head. Chain Wheel Operated, Retractable, Telescoping Type Rotary Soot
Blower In Convection Section of Boiler.
Super¬heated Steam Boiler Main steam Outlet Compressed air system including two
rotary screw compressors, two air dryers and two air receivers.
Water treatment system including demineralising plant. Chemical feed system including
pumps, tanks and agitators. Sampling system.
Fire protection system including a diesel driven emergency fire pump. Service water
Cranes and hoists including 45/10 tonne turbine bay bridge crane.
Generator 19 kV system including isolated phase bus duct, load break switch, voltage
transformer and generator neutral earthing transformer.
220 and 110 kV systems including one main 305 MVA 19 kV/220 kV generator
transformer, one 15/20 MVA 6.6 kV/110 kV reserve transformer, 220 kV surge diverters
and 110 kV surge diverters.
Auxiliary power system including one 15/20 MVA 19 kV/6.6 kV auxiliary power
transformer, 6.6 kV switchgear, 415 volt substations and DC switchgear.
Control and instrumentation systems including combustion control system, automatic
burner control system, turbine generator controls, control room equipment and
annunciator systems and protection and metering panels.
Piping including interconnecting main steam, reheat, feedwater condensate, cooling
water, service water, compressed air and miscellaneous services.
Power, instrumentation and control cabling. Structural steelwork including turbine and
boiler support structures, turbine and boiler buildings, access galleries and stairways.
Chimney flue liner 4.27 m diameter Corten B steel, insulate with 50 mm fibreglass.
Yard tanks including service water tanks and a demineralised water storage tank.
The data processing computer and one of the 240 V DC battery banks, which have been
removed for use at other sites, are not available for sale.
Concrete structures including the turbine, building and chimney foundations, chimney
windshield and intake structure.
Buried fixtures including concrete circulating water pipework, cable ducting and site
While the plant has been in long term storage, some plant items have been used to
maintain the stored condition and for operation and storage of the adjacent Power
Station. Specific plant in regular use and therefore not in near new condition, includes
the following. Consideration of this equipment for sale would be by negotiation.
Auxiliary transformer ¬used for providing power to services such as lighting and
Air compressors ¬used for supplying dry air to both stations, for storage purposes.
The circulating water system hypochlorinator ¬used for the dosing of the adjacent
stations circulating water pipelines on a regular basis.
The DC battery system.
The power station has been in long term storage since construction was stopped in
1979. It was initially envisaged that the storage period would be for a maximum of 10
years, and that the situation would be reviewed and procedures possibly amended if the
period was to be extended.
The original storage philosophy, based on a 10 year storage period, was that the
equipment should be stored and maintained in as near operating condition as possible.
Storage procedures incorporated a combination of methods but mainly comprised dry air
for internal, closed volumes, such as boiler and pipework and various coatings for other
surfaces. Radiant heaters in the boiler furnace have ensured an elevated temperature in
this space.
Outdoor plant which could be readily moved has been moved to indoor storage. Such
plant includes most motors and pumps, with the motors being stored with
anti¬condensation heaters connected and energised.
Not commissioning the station prior to storage and the fully enclosed design of the boiler
and turbine buildings have greatly aided the long term storage process. This has
resulted in minimal corrosion within the generally dry, warm atmosphere within the
The proximity of the station to the coast means that outdoor plant suffers from the harsh
corrosive atmosphere, especially where equipment is not regularly washed by rain to
remove salt deposits. For certain minor structural steelwork, small¬bore pipework and
valves located outdoors, no particular storage procedures have been followed, as
replacement prior to commissioning was seen as the most appropriate action.
From the time the long term storage procedures were instigated, the station has
continued to be maintained by staff from the adjacent power station. The scope of
maintenance work has generally ensured that the plant is kept in excellent condition.
This has been confirmed by several plant reviews in the period 1987 to 1993 by
independent consultants. In addition to the scope of maintenance work required by the
long term storage procedures, the following has been carried out in recent years:¬
External boiler ductwork has had its cladding and thermal insulation removed and the
underlying steelwork surfaces have been cleaned and painted to arrest corrosion.
The main and reserve transformers have been refurbished and repainted allowing the
removal of most of their cooling fans to indoor storage.
The service water tank anchor bolts and supports have been modified and upgraded.
Duct support steelwork has been sandblasted and painted.
Bottom sections of the chimney have been sandblasted and painted.
Summary of Option Reviews and Investigations
The owner has carried out numerous reviews, studies and investigations of options for
utilising the power station in the local power system.
In 1980, the year following the decision to place the situation in long term storage, the
then Electricity Division to the Ministry of Energy engaged the original designer of the
power station, to carry out a feasibility study on using alternative fuels for the station.
They studied four options: fuel oil as designed,
replacement coal fired boiler, coal¬oil mixture firing and coal gasification.
The study concluded that a new coal fired boiler was the best option.