Scope of design includes C.W. system, industrial service water system, potable water, discharge system and makeup water supply system of the power plant.
1) Circulating water will be provided by secondary through for condenser cooling and for heat exchanger cooling. The heat exchanger will be used for auxiliary equipment cooling.
2) Make up water will be surface water from San Pedro river.
3) Sanitary waste water and oil waste water will be treated and reused.
4) Rain water will be drainage to river in gravity.
The cooling water for the power plant will be taken from the cooling tower basin and the cooling water system will be of a secondary circulating water supply system. The CW System will consist of the following equipment:
l Concrete Cooling Tower Basin and C.W. Pump House
l hydraulic actuated butterfly valves, Expansion Joints, CW Pipe, and All Other Necessary Valves, Piping, and Accessories for a Complete System
The C.W. pump house consists of screen chamber and pump chamber. It will be designed as a complete structure made of reinforced concrete.
1). Cooling Water Quantity for Condenser and auxiliary equipment.
1X200MW condenser generator unit will be installed in the plant. Second-through water system with induced draft cooling tower will be adopted. The C.W. water flow for the plant is as following(see9.3-TABLE 1).
2). Make-up Water Quantity.
A) Vacuum dust removing will be adopted in the coal conveyance system. Ash disposal system will be dry ash disposal system and the Ash humidifier water will be adopted the reused water.
B) Close cycle cooling water system will be used for auxiliary equipment cooling water, and the heat exchanger will be used.
C) Sanitary waste water will be treated and reused.
D) Oily waste water will be treated and reused.
E) Coal yard runoff water will be treated and reused.
Number of cells 7 cells�?work+1standby�?/DIV>
Arrangement of cells 1 line
Tower length (one cell inside) 17.8m
Tower width (one cell inside) 17.8m
Total tower length of line (inside) 124.6m
Total tower width of line (inside) 17.8m
Tower storage water basin capacity approx.4400 m3
Construction description:
Cooling tower will be installed outdoor with cooling water basin. Cooling tower consists of housing, filling, air inlet opening, water distribution system, motor, speed reducer, fan, support frame, sound absorption material, water inlet, water outlet, overflow and drain pipe.
Tower housing will be made of reinforced concrete frame structure. Tower filling will be made of PVC corrugated plates. The plates will provide better water distribution efficiency. The plates will have good thermal stability and be the fire resistant. Water distribution pipe will be made of PVC. Water will be distributed evenly, with low head loss. Fan will be of low noise, high efficiency axial flow type. Water basin will be half- underground shape. Cooling tower water basin will be made of reinforced concrete structure. The headroom dimension is 124.6m long and 17.8m wide. The depth of basin is 2.2m.
9.3.4 The Selection of C.W. System
The flow diagram for the cooling water system will be:
C.W. pump house------pressurized inlet pipe ------condenser and oil coolers------C.W. discharge culvert------induced draft cooling tower ------C.W. discharge channel------ C.W. pump house.
The C.W. steel inlet and discharge pressurized pipes (1xDN1800), The water velocity is about 2.57m/s..
9.3.5 Structures Collocation
1) C.W pump house
The pump house will be provided with front intake room, screen and C.W. pump room.
Total 2X100% vertical mixed flow pumps and 2x100% ACW pumps will be installed in two separate water sumps in pump room, each of which will be 3 m wide. Two hydraulic butterfly valve will be installed at the outlet of the C.W. pump.
For maintenance and installation of the equipment, the lifting equipment of 20 tons in capacity will be installed in pump house.
9.3.6 Circulating Water Pump and Pipe
Cooling Water System will be provided with 2x100% capacity vertical wet pit, single stage, mixed flow type circulating water pumps.
Capacity 6.55 m3/s
Delivery head approx. 20mH2O
Pump motor power 1700kW
Reversal running speed of circulating water pump will be 125% of nominal running speed when accident. When one pump accident and the outer valve accident concurrence the pump will be permitted that any parts associated with body and motor will not be damaged by such reversion (100% full speed) for not longer than fifteen minutes.
The inlet and outlet culvert for opened cooling water system will be 1xDN1800 steel pipe (Q235B) independently. The flow velocity in the pipe is 2.57 m/s. The pipes will be laid under the ground with an overburden with 3.5 m.
Auxiliary Cooling Water System will be provided with 2x100% capacity vertical circulating water pumps.
Capacity 0.44 m3/s
Delivery head approx. 20mH2O
Pump motor power 120kW
9.4 Make-Up Water System
9.4.1 Water characteristic
Water will be supplied for plant operation from surface water from San Pedro river.
The design average flow of make-up water is 611 m3/h.
9.4.2 make-up pumps satation
Three channels which are 1.5m wide will be constructed in Make-up pump station. And 3x50% make-up water pumps for this unit will be installed.
9.4.3 Pretreatment station
According to the request of contract, the raw water should be treated. Two flocculate sedimentation tank with capacity of 600m3/h will be designed for unit 1. There have drainage sludge pump house and drainage sludge channel and distribution well.
9.5 Service and Potable water System
Two 1000m3 service water storage basins will be provided, via this basin, water will be pumped to service water users. The basins also contain the fire fighting water.
One 200m3 portable water pond and 2x5m3/h pressured filter will be provided. The water source is from river water after pretreatment.
One 200m3 reused water pond will be provided.
A pumping station with 2×100% service water pumps and 2×100% potable water pumps and 2×100% reused water pumps will be provided. The potable water pumps will be with a transducer.
The sanitary sewage will be collected by pipe at various trapping points and then flow into sanitary waste water lift pond. It will be pumped into the sanitary sewage treatment equipment and then discharged to reuse water pond. The quantity of sanitary sewage treatment is 2x3m3/h.
9.7 Rain water System
Rainfall from inside the power island loop and roads including the asphalt and building roofs will be collected to underground rainwater drainage pipe and flow to the San Pedro river in gravity.
9.8 Oily waste water treatment System
9.8.1 Function of the System
Oil contained in the oily waste water will be extracted out for re-utilization and the waste water after complying with the drainage standards will be discharged to the Wastewater Collection Basin.
Oily Wastes, which basically arise from:
· Main Plant oil handling area washing water and oil spillage
· Transformers area wash water
· Fuel oil tank yard storm.
· Lube Oil storage area
· Plant vehicle fueling station
Oily water separator and a rectangle oily water pond are arranged for oily water from oil area. Capacity of oily waste water pond is 150 m3.
There is one emergency oil basin in the transformer area. When fire emergency occurs, the transformers will drain oil to the oil basin for storage so that the fire can be controlled. The effective volume of each basin is 100m3 to store one main transformer’s oil quantity and 10min water quantity of water spray system.
9.8.2 Major Equipment:
Oily water separator
Numbers: 2 sets
Capacity: 5 m3/h
Oil content in water after separation: less than 10 mg/l.
9.9 Permanent Ash Landfill at Site
The capacity of annual ash disposal for 1×200MW units is 9.818×104 m3 at design condition.
According to the invite bidding document, Space only is designated for future addition of a dry ash storage landfill inside of the security fence. No allocations for grading, liner, ash storage run-off pond for the dry ash storage landfill outside of the security fence are included.
The volume of ash yard for 10 yeas of 1×200MW unit is 98.18×104 m3; for 20 yeas is 196.36×104 m3.
Because of the information of site condition is not clear, doesn’t consider the cost of ash yard at this stage.
The contractor will provide a complete fire protection system that furnished with all required equipment to form a complete fire protection system as define by NFPA codes, standard and recommended practices codes, as listed below:
(1) Yard mains and outdoor fire hydrant will be in accordance with NFPA 24 and 26
(2) Stand pipes and hose systems will be pre NFPA 14, 1961 and 1962.
(3) Automatic fire detectors, Fire Alarms and fire protection actuation system, will be per NFPA 72A-E.
(4) Portable fire extinguisher and dry chemical extinguishing system will be per NFPA 10 and 17.
(5) Dry chemical systems will be per NFPA 17.
(6) Carbon dioxide systems will be per NFPA 12.
(7) Water spray fixed systems will be per NFPA 15.
(8) Fire water valves will be per NFPA 13, 14, 15, 20, 24 and 26.
(9) Fire pumps will be per NFPA 13 and 20.
(10) Water supply will be per NFPA 13, 15, 20 and 22.
(11) The deluge fire protection system will be per NFPA 13 & NFPA 15.
(12) The water and foam monitors will be provided per NFPA 11
The fire protection system design will be adequate for the site condition, to provide a high degree of protection to the plant, equipments, buildings and employees.
10.2 Scope of Design
Indoor and outdoor fire fighting of buildings will be designed, including main block, transformer, administration building and other auxiliary workshop.
According to NFPA, the fire fighting measures for building and equipment in the power plant is as the following list.
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(1)Building |
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1. Turbine Floors |
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2. Boiler Floors |
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3. Bunker Room |
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4.Plat Control Operating Floor |
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5. Electric Equipment Control Room |
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6.Cable Room |
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7.Battery Room |
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8. Coal Handing Control Building |
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9.Ash Handing Control Building |
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10. Fire Fighting Pump House |
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11. Gate House |
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11. Air Compressor House |
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12. Ash Air Compressor House |
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13. Water Treatment Plant |
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14. C.W. Dosing Room |
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15. Auxiliary Boiler House |
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16．C.W pump house |
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(2)Turbine-Generator Area |
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1. Gen.Bearing |
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2. Turbine-Bearing |
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3. Turbine Lubrication Oil |
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4. Turbine Oil Storage Tank |
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5. Turbine Oil Cleaner/Purifier |
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6. Main Transformers |
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(3) Boiler Area |
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1. Coal Feeder |
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2. Conveyor Gallery |
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3. coal bunker. |
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(4) coal Conveyor Transfer system |
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1. Conveyor Transfer Towers and Crusher House |
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2. coal yard |
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3. Bulldozer Garage |
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4. coal dock and Conveyor belt |
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(5) oil tank |
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1.oil tank |
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2. oil burning pump house |
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(6) Others |
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1.coal waste water treatment station |
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2. Ash Silos Area |
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3. Limestone Crusher House |
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Note:
a. fire Hydrant
b. Automatic Spray
c. Portable Fire Extinguisher
d. Fire Alarm Detector
e. low pressure carbon dioxide system
f. low expansion foam system
The source of water for the Fire Water Systems will be the service/fire water storage pond with dedicated fire water storage.
In order to ensure fire fighting water supply system credibility and test convenience, independent fire fighting water supply system will be designed to provide enough quantity and pressure for Indoor and outdoor fire fighting of main block, transformer, administration building and other auxiliary workshop. The fire fighting makeup water is well water.
The fire fighting water supply system is consist with one set of 100% motor driven fire pump, two sets of jockey pump and one 1m3 buffer tank, one 100% diesel fire pump and network. All the fire fighting pumps install in the service/fire fighting water pump house. two 1000m3 fire water storage basin will be provided. The capacity of fire fighting is 600 m3.
Fire fighting pump’s performance parameters:
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Name |
Flow
(m3/h�?/DIV> |
Head
(m) |
Quantity
(set) |
Motor |
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Power（kw�?/DIV> |
Voltage
（V�?/DIV> |
Quantity
(set) |
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Motor driven fire pumps |
342 |
80 |
1 |
100 |
380 |
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Diesel fire pump |
342 |
80 |
1 |
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Jockey pump |
18 |
90 |
2 |
15 |
380 |
2 |
10.5 The fire fighting truck
A fire water/foam fighting truck will be provided for the power plant.
