The three (3) gas turbine units shall be arrayed outdoors in axial parallel line, the spacing interval shall be 35m.
Low pour oil is the main fuel for the plant and crude oil is the auxiliary fuel. If natural gas is available, it will be the main fuel. All the fuel is piped to 1m outside of the plant from the source (the information is assumed).
There will be some oilcans、gas turbine prepositive skids、and all inner pipes in the fuel oil system of the plant. It comprises of oilcan section, shed of unload oil pumps、dirt oil sump and crude oil treatment station etc. The oilcan section will be set isolated as per diversified quality of the fuel oil. The unload oil shed will be constructed in the adjacent area which is beside the fire protection dyke of the oilcan section, it has the function of unloading the low pour oil and the crude oil respectively. The crude oil treatment station shall purify the crude oil through the centrifugal device, it will get rid of the heavy metal hydronium such as Na+K＋etc in the crude oil in order to meeting the requirement of the gas turbine. The crude oil treatment equipment will be transferred to the site as several skid which will be manufactured in the factory. The dirt oil sump will accept the waste oil and water of the oilcan section and dispose it in order to safety drainage. The prepositive skid of the gas turbine will be transferred to the site as several skid too, all these will be set beside the gas turbine respectively.
The detail content for this system will be shown in the drawing: AF2009029-J03-01.
The Fuel Oil System(FOS) shall include the following major components (the system will be set based on the low pour oil) :
f. crude oil unloading device 1 set
l. one set of sewag, e & waste oil separator.
This system will be designed based on the natural gas parameter.
The gas turbine units and their auxiliary systems and relevant auxiliaries of gas turbine units shall be designed and supplied by GE. The Major auxiliary systems are described below:
During the startup, normal operation and shutdown of unit, the common lube oil system supplies the clean lube oil with sufficient flow-rate, suitable temperature and pressure to each bearing, gearing device and its auxiliaries of the unit to ensure safe and reliable operation of the unit, as well as to prevent bearing from over-heating, rotor from bending, and high speed gear flange from distortion.
a. One 6435L lube oil tank installed under the base-plate of the accessory compartment.
b. One main lube oil pump driven by the shaft of accessory gear box: 110m3/hr, 0.82MPa, 30kW
c. One AC motor driven auxiliary lube oil pump: 104.4m3/hr, 0.475MPa, 30kW, AC
d. One DC motor driven emergency lube oil pump: 56.7m3/hr, 0.21MPa, 7.5kW, DC
The hydraulic oil system shall supply the required high-pressure oil to the actuators of all control system. The hydraulic oil shall be taken from lube oil system. The major components of hydraulic oil system are listed as follows:
a. One main hydraulic oil pump driven by the shaft of accessory gear box: 3.75m3/hr, 8.3MPa
b. One DC motor driven auxiliary hydraulic oil pump: 2.1m3/hr, 13.79MPa, 6kW, DC
c. Dual-link hydraulic oil filter: paper made cartridge: 0.5mm
d. Manifold hydraulic assembly
The trip oil system shall serve as the basic control and protection system of the fuel gas turbine. It shall locate between the fuel gas turbine control panel and the fuel gas turbine component, to control the supply and shut-off of the fuel gas. The trip oil coming from the lube oil system shall enable the functions of trip (abnormal shutdown and emergency shutdown), and shall transfer the signal of hydraulic oil to fuel globe valve to enable the normal startup and shutdown.
During startup, the accessory gear transmits torque form the starting device and torque convertor assembly to the gas turbine shaft. After startup, torque is transmitted form the gas turbine shaft via suitable gear drives to the following:
a. Fuel pump
b. Main lube oil pump
c. Main hydraulic supply pump
d. Main atomizing air compressor
The starting system includes the drive equipment to bring the unit to self-sustaining speed during the starting cycle. The cool-down system provides even cooling of the rotor after shutdown. The unit is ready to start on signal at any time after it has come to rest. The starting system consists of the following equipment:
a. Starting motor: 600HP, 3000V
b. Hydraulic torque converter and its oil supply pump
c. Starting torque converter
d. Turning gear device, applying for low-speed turning, 0.6kW, DC
The fuel system provides the fuel with required flow and suitable pressure to the combustion chamber, to meet the requirement of starting, accelerating, and loading of the gas turbine. The system consists of the following equipment:
a,. Fuel forward pump
b. Speed/Ratio valve
c. Control valve
The heating system shall supply the lube oil at suitable temperature during gas turbine shutdown and standby, the main equipment consists of the electrical heater in lube oil tank.
The ventilation fan shall be provided on the roof of the gas turbine compartment. It shall automatically engage after unit initial startup. The ventilation fan shall extract the hot air out of the gas turbine compartment, and forces the fresh air into the gas turbine compartment through each vent openings, thus cooling down the air temperature in the compartment during normal operation, and also shall disable the accumulation of combustible gas.
Two ventilation fans shall be installed on the top of load gearbox, to supply fresh air and for the purpose of ventilation and heat dissipation.
A cooling water system shall be supplied to dissipate the heat from the lubrication oil coolers, turbine support legs and the generator in operation with outside water supply system. The system consists of the following equipment:
a. Two lube oil coolers: tube-shell type
b. One atomizing air cooler: tube-shell type
c. One generator closed air coolers: surface type
d. Two temperature control valve: adjusting the cooling water flow by means of adopting temperature sensor to ensure the lube oil temperature and atomizing air temperature lie within the suitable scope.
The air inlet system leads the air from air inlet filter to the inlet of the compressor, and supplies the clean air required for fuel gas burning. It also reduces the sound to a minimum level. The system consists of self-cleaning type air filter, silencer, piping, inlet chamber and supporting.
The exhaust system is the portion of the gas turbine in which the gases used to drive the turbine are redirected and released to atmosphere. It also reduces the sound to a minimum. The system includes exhaust plenum, transition ducting, silencer, expansion joints and a vertical direct exhaust stack of 22.5m height.
The compressor cleaning system includes a water-washing skid (one per plant), fixed washing nozzles (seven per unit) and piping. Off-line washing is the process of injecting cleaning solution into the compressor while the gas turbine is being turned at cranking speed. Proper using of this system can efficiently remove the various water-soluble materials and oil, gas deposits on compressor blades, so as to resume compress ratio and flow of compressor, improve unit output.
Compressor extraction air handling system serves as an air process skid with individual base-plate. It reduces both temperature and pressure as well as remove moisture of the high-pressure and high-temperature air extracted from gas turbine compressor exhaust, so as to enable on-line blow for inlet filter reverse blowing system.
One standby air compressor (1.65m3/min, 0.69Mpa) engages during unit maintenance and performing the experiment of reserve blowing system.
The fire-fighting system provides fire protection for unit, which includes a CO2 cabinet for location of fire sensors, high-pressure CO2 bottles and nozzles, control and piping. In case of fire occurring in compartments, the system will release CO2, close all ventilation openings, reduce the oxygen content from normal density 21% to below 15% which can not support firing of fuel oil and lube oil, and thus enable fire-fighting. As the consideration of the re-fire possibility of combustible material on exposed high-temperature metal surface after fire has been extinguished, the CO2 re-release function is provided for this system to keep the CO2 density maintaining at extinguish density for lasting 40 min.
The oil mist eliminating system consists of oil mist eliminator and piping. Its function is to separate the oil from the air extracted from load gearbox and lube oil tank. The separated oil returns to oil tank and the clean air exhausts to atmosphere. Two benefits can be expected: the first is to reduce the pollution of the environment and the other is to reduce the lube oil consumption.
The workshop and store building with total areas of 150m2 will be furnished in the power plant, in which one (1) electric single-girder under-slung crane with lifting capacity of 5 ton is provided.
Three (3) sets of 42MW gas turbine generator will be built in this project on this stage. Generator will be connected to the 132 kV substation via the step-up transformer. A circuit breaker will be furnished between gas turbine generator and the step-up transformer, its rated breaking current will be 63kA and rated current will be 3150A. Generator will be connected to the step-up transformer by HV cable.
Double bus will be adopted in the 132kV air insulated system substation. There are three Switchgear bays for generator transformer, three Switchgear bays for outgoing lines, one Switchgear bay for standby transformer, one bus-couple Switchgear bay and one busbar equipment switchgear bay.
A set of two circles unit auxiliary transformer rated 500kVA will be branched from the copper busbar, and then supply the 400/230V LV auxiliary load after dropping voltage to 400V.
A set of diesel generators rated 1600kW which used for black-startup will be provided for 3kV medium voltage auxiliary electric system. They will supply the 3kV auxiliary load such as starting motor and LV standby transformer.
One set 132kV standby transformer rated 3150kVA will be connected to 132kV double bus. They will be changed to 3kV as the start up and standby power supply.
One set 3kV standby transformer rated 500kVA will be connected to 3kV bus. They will be changed to 400/230V as the spare power supply.
The neutral point of generator will be ungrounded, medium voltage auxiliary electric system will be ungrounded while the low voltage auxiliary electric system will be solid-grounding .
Detail connection drawing refer to the drawing “ELECTRICAL SINGLE LINE DIAGRAM�?/DIV>
In order to prevent the damage from direct lightning, lightning rods will be installed on main building and other place where necessary.
The earthing grid made of horizontal and vertical earthing device will be installed in the whole plant. Horizontal earthing conductor will be 40x3mm2 copper bar, vertical earthing copper rod will be Φ25mm . The grounding wire of the equipment will be connected with grounding grid by 100mm2 copper wire.
Normal lighting and DC emergency lighting system will be provided. AC normal lighting system will be 400/230V, 50Hz, 3 phase 4 wires system. DC emergency lighting services will be obtained from the batteries supplied. Under AC failure conditions, the DC emergency lighting to be installed will be automatically switched on.
10.5kV cable will be of copper conductor with stranded copper wires, insulated type, the size will be 500 mm2.
Power cables for systems rated 3 kV and below will have stranded copper conductors with XLPE insulation, conductor screen, insulation screen and steel wire armouring and a PVC reduced propagation oversheath .
Control cables shall have stranded copper conductors with XLPE insulation, conductor screen,, Instrument and data cables shall be armored and shall have conductors and insulation appropriate for their duty.
Cables associated with the fire fighting system shall fire resistant in accordance with Chinese code.
Cable raceway in plant area and workshops will be mainly cable tray and cable trench.Cable will be layout through conduit from cable tray or trench to equipment.
4.5 Secondary wiring
4.5.1 Excitation System
The excitation for GTG will be provided by a brushless excitation. The excitation system shall match the generator rating and shall maintain the voltage of the unit within a tolerance of plus and minus 0.5% of rated voltage regulation. The exciter shall have capacity to supply not less than 110% of the field current required by the generator at rated output, power factor, frequency and voltage.
The excitation for GTG will be provided by the manufacturer of GTG.
The AVR for GTG will be arranged in the control room for the GTG.
4.5.2 Control, Signaling and Metering
The electric equipment for this GTG power plant will be controlled in the main control room (MCR). Control and supervision of the electrical system, GCB and the intermediate voltage for GTG internal plant power distribution system shall be via the Human-Machine interface (HMI) and LCD display in the MCR. The following equipment will be controlled and supervised on the DCS: 10.5kV circuit breaker, unit auxiliary system, motor and DC systems etc. The DC220V one-to-one control mode with supervisory connections will be adopted for all the equipments, which will be controlled and supervised on the DCS.
The automatically quasi-synchronizing device for GCB will be provided.
Tariff metering will be provided at GCB to measure the import and export of Class 0.2 accuracy MWh meters and MVARh meters. The 10.5kV will be provided with Class 0.2 accuracy MWh meters and MVARh meters. The unit auxiliary transformer will be provided with Class0.2 accuracy MWh meters.
4.5.3 Protection System
Microprocessor based data protection relays will be provided for GTG, step up transformer, standby transformer and unit auxiliary transformer.
The protection for GTG will include differential, over-current protection, negative phase sequence over-current protection, field failure protection, 100%stator earth fault protection, reverse power protection, time delayed over-voltage, under/over frequency, overflowing, reverse power, pole slipping, voltage transformer balance (fuse fail), circuit breaker failure and necessary auxiliary relays, lockout relays, test terminal blocks, etc.
The protection for step up transformer and unit auxiliary transformer will include differential protection, over current with under-voltage restrained protection, earth fault protection, temperature protection, pressure protection and necessary auxiliary relays, lockout relays, test terminal blocks, etc.
The protection for 3kV motors will be integrated protection device mounted on the 3kV switchgear cabinets.
Manufacturer of GTG will provide the protection relays for GTG generator.
4.5.4 DC System
The DC system shall be designed to provide power source for emergency lighting, control, protection, DC motor, indication and alarm as required by GTG unit, 11kV CB, power control centre and motor control centre.
Two sets of 220V batteries of 1000Ah will be provided. Battery will be lead acid (VRLA) batteries.
Each bank of batteries will be provided with one charger, which rated capability is 180A. The battery chargers shall be silicon rectifiers. Each charger will be rated for supplying 100% of the total DC normal load plus full boots charging of one bank of batteries following emergency discharge period of 2 hours.
4.5.4 UPS
One set of 220Vac UPS supply system will be adopted. The 220Vac UPS supply system should be inverter fed from the 220V DC system .
The 220Vac UPS system will service:
(a) DCS
(b) GTG Supervisory Equipment
(c) Unit Operator Workstation
(d) Engineering Workstation
4.5.6 SCADA
A set of supervisory control and data acquisition (SCADA) system will be equipped.
The supervisory range includes generator, step up transformer, unit auxiliary transformer and standby transformer.
The supervisory and control range includes the bus coupler breaker and the transmission line.
5. Instrument and Control
The main design scope covers:
Gas turbine generator unit;
Fuel oil system;
Air compressors ;
Circulating water system;
Make-up water treatment system.
Auxiliary power system
5.2 Main system and equipment
5.2.1 The control of gas turbine generator
The control of the gas turbine generator will be implemented by MARK VI control system based microprocessor which furnished by gas turbine generator. A fully comprehensive control system will be provided for the control, protection and supervision of the gas turbine generator. Operator can supervise the main parameter of the unit, and can control the unit via the HMI station.
5.2.2 The functions of the MARK VI
On the MARK VI control cabinets there are some important switches such as normal start-stop switch, emergency stop switch, Base-peak load selector switch, manual load control etc.
On the HMI the following functions can implement:
--Normal start-stop
--Emergency stop down
--Base –peak load select
--Status indicate: standby, starting, on-line, Emergency shut down etc.
--Speed indicator
5.3 The design principle of the auxiliary workshops
5.3.1 Fuel oil system
The fuel oil system will be controlled by DCS, DCS cabinets will be located locally, and its HMI station will be in the Central Control Room (CCR). Operator can monitor and control the system in the CCR.
5.3.2 Circulating water system
The circulating water system will be controlled by DCS,DCS cabinets will be located locally, and its HMI station will be in the Central Control Room (CCR). Operator can monitor and control the circulating water system in the CCR.
5.3.3 Make-up water treatment system.
Make-up water treatment system will be controlled by DCS. The DCS and MMI station will be located in make-up water treatment system house.
5.3.4 Auxiliary power system
Auxiliary power system will be controlled by DCS, DCS cabinets will be located in rack room, and its HMI station will be in the Central Control room(CCR). Operator can monitor and control the auxiliary power system in the CCR.
5.4 Local control and instrumentation
Instruments utilizing signal-transmitting for measurement of plant process parameters such as sensors, process switches, transmitters, etc. will be provided to support the four functions of control, monitoring, alarm and protection for plant. Local indicators, such as pressure gauges, thermometers, level gauges, flow meters, and etc. will also be provided for maintenance, local monitoring and operation
6 Water Supply and Drainage System
The water supply & drainage system for the 3´6B gas turbine power plant will include the following sub-systems:
l Closed circulating water system
l Make-up water system
l Service water system
l Potable water system.
l Sanitary water system
l Rain water system
l Industry waste water treatment system
l Fire fighting water system
6.2.1 Closed Circulating Water System
The cooling water for the gas turbine, generator and auxiliary equipment will be of a closed circulating system with forced draft dry cooling tower.
For one 6B gas turbine generator, the cooling water quantity is about 280 m3/h.
The system�?process will be as follows: Dry type cooling tower --- C.W. pumps --- C.W. pipe --- Main and auxiliary cooler --- C.W. pipe --- Dry type cooling tower.
The system include the following items:
l Dry type cooling tower
The cooling towers will be of the 6 cells induced draft designed so that one cell of six out of operation they will cool the heated water to the required design temperature when one GTG unit operating at full rated output. The total designed capacity of the cooling tower is 300m3/h, each cell’s capacity is 60 m3/h, and consists of fan blade, drive motor, drive shaft, gearbox, air cooler, RC frame structures, and hoist equipment for easy to maintenance.
l Circulating water pumps
Two C.W. pumps with each of 100% capacity for the One 6B GTG unit will be provided (One work one for backup). The specification for the C.W. pump as following:
|
Capacity (m3/h) |
300 |
|
Delivery head (m) |
20 |
|
Pump motor power (kW) |
75 |
l Circulating water pipe
Stainless steel pipe will be used for C.W system pipe mains, and the proposal diameter of C.W main pipe will be DN300.
6.2.2 Make-up Water System
The make-up water system provide make up water to circulating water system. For close circulating water system blowdown flow is 3 m3/h, so the make-up water quantity is 3 m3/h. The required water quality will be demineralized water. So the raw water must be treated.
The make up raw water flow list as following:
|
No. |
Item |
Water flow |
|
1 |
For circulating water system |
3 m3/h |
|
2 |
Potable water system |
2 m3/h |
|
3 |
Service & others water |
1 m3/h |
The make up raw water flow from outside will 6 m3/h and will come from outside of the power plant and the terminal point will be at 1 meter outside of plant fence proposal. A raw water balancing reservoir with capacity of 5 days make-up water demands will be provided. The proposal volume of the reservoir will be 1000 m3, the reservoir also considered as fire-fighting water purpose.
6.2.3 Service Water System
The flow diagram of the service water system will be designed as: water treatment plant --- service water pumps --- pipelines --- auxiliary cooling water.
6.2.4 Potable Water System
The maximum hourly water consumption will be 2 m3/h.
Potable water will be supplied for the users by potable water pump. Two (2) 100% capacity pumps will be installed in the complex pump-house, one work and one standby..
6.2.5 Sanitary Water System
The sanitary water will be collected by pipe at various points and then flow to the sanitary water-regulating pond. It will be pumped into the sewage treatment facility. After treatment, the water will be discharged to the Rain water system to discharge outside of power plant. The capacity of sanitary water that will be treated is about 2 m3/h.
All surface storm water will be collected gravity by the storm water pipe and discharged to outside of plant (the terminal point will be at 1 meter outside of plant fence). The design scope will be within the plant fence.
6.2.7 Industrial Waste Water System
All industrial wastewater, such as waste oil water, transformer emergency oil must be treated or stored.
6.2.8 Fire-fighting Water Supply System
There are one 100% motor driven fire fighting, one 100% diesel fire fighting pump and two jockey pumps will supply water to fire-fighting system. The water source will come from raw water balance reservoir and pumps will be set at complex pump house.
7 Chemical water treatment
7.1 Scope of Design
Chemical water treatment section includes the following subsystems:
· Demineralized water treatment system
· Waste Water Neutralization System
· Auxiliary Closed Cooling Water Dosing System
· Chemical Laboratory
7.2 Demineralized Water Treatment System
7.2.1 System Design Description
Raw water for the power plant is deep well water. The assumed TDS of the deep well water is less than 800ppm. The proposal water treatment system process will be:
Raw water →Raw water tank→Raw water pump→self-cleaning filter→Ultrafiltration (UF) Device →UF water tank→UF water pump→safty filter→HP pump→The first pass Reverse Osmosis (RO) →The first desalinated water tank→HP pump→The secondary pass Reverse Osmosis (RO)→The second desalinated water tank→Desalinated water pump →Mixed-bed exchanger→demin. water tank →Demin. water transfer pump→Users
The treated water can meet the water quality requirement of the unit.
7.2.2 Demin.
Water consumption of the plant and the capacity of water treatment equipment
|
Item |
Demin. Water consumption |
Data(t/h) |
|
Closed cycle cooling water make up |
Make up rate:0.3%~0.5% |
2 |
|
Gas turbine injection water |
~10t/h for each unit |
30 |
|
Total (Normal) |
|
32 |
According to the total demin. water consumption of the plant and considering 30% margin for water treatment equipments, the capacity of the water treatment equipment will be 42t/h.
The chemical waste water from water treatment system will be connected in one neutralization basin, where the wastewater will be neutralized until the value of pH reach 6~9 before discharge or reuse.
7.4 Auxiliary Closed Cooling Water Dosing System
In order to protect the pipe and equipment from corrosion,a kind of corrosion inhibitor will be added into auxiliary closed cooling water.
The auxiliary closed cooling water dosing device includes two (2) tanks and two (2) metering pumps.
7.5 Chemical Laboratory
The necessary laboratory equipment for testing of water and oil will be provided in the chemical laboratory.
The office building should be two-storied, the floor height should be 3.6m and it should be frame construction. Office, meeting room, duty room, and toilet should be set in it. The toilet and coffee bar should be set separately on the first floor and the second floor. The manager room, the deputy manager room should be on the second floor. Gypsum board ceiling should be set for all rooms in the office building.
The workshop & warehouse should be one-storied and frame construction. It contains maintenance and material storage room.
The electrical control building should be one-storied, it is frame construction and the height is 5.00m. Each distribution room, battery room, control room should be set on it. Gypsum board ceiling should be set for central control room, Two reinforced concrete stairs should be installed in the central control building in order to satisfy the requirement of safety and evacuation.
The chemical water treatment plant is the L shape arrangement and should be two-storied and frame construction. The water treatment plant is in the first floor and the floor height of it should be 10.0m. Beside it, there should be chemical dosing room，measurement room and etc, the floor height of them should be 6.0m laboratory, distribution room and control room is set on the side of the water treatment plant, the floor height should be 5.0m and it should be two-storied.
8.1 Architectural treatment
It shall be compact and clear, fluent in line, plain and brief in the treatment of elevation in Main Block. Each producing auxiliary and ancillary building shall be harmonized with each other in elevation mould and color. The pressed thermal insulation steel plate shall be adopted in the exterior wall of Main Block.
8.2 List of plant buildings
|
NO. |
Name of buildings and constructions |
Number of floor levels |
Area
(m2) |
Story height
(m) |
Construction type |
|
1 |
Office Building |
2 |
900 |
7.5 |
Frame |
|
2 |
Workshop & Warehouse |
1 |
240 |
7.0 |
Frame |
|
3 |
Electrical Control Building |
1 |
425 |
5.0 |
Frame |
|
4 |
Chemical Water Treatment Plant |
2 |
1115 |
10.0/6.0 |
Frame |
8.3 List of architecture decoration
|
NO. |
Name of room |
Flooring |
Wall & Dado |
Ceiling |
Door and Window |
|
1 |
Office Building |
|
|
|
|
|
|
Office |
PVC plastic floor or floor tile |
Paint |
Gypsum board |
Aluminium alloy window and wood door |
|
|
Meeting room |
ditto |
ditto |
ditto |
ditto |
|
|
Duty room |
ditto |
ditto |
ditto |
ditto |
|
|
Coffee bar |
Floor tile |
ditto |
ditto |
ditto |
|
|
Toilet |
Floor tile |
Tile |
ditto |
ditto |
|
2 |
Workshop & Warehouse |
|
|
|
|
|
|
Maintenance room |
Cement mortar |
Paint |
Paint |
Aluminium alloy window and steel-plate door |
|
|
Material storage room |
ditto |
ditto |
ditto |
ditto |
|
3 |
Electrical Control Building |
|
|
|
|
|
|
Central control room |
PVC plastic floor or floor tile |
Paint |
ditto |
Aluminium alloy window and fireproof door |
|
|
Distribution Room
|
Electrostatic prevention movable floor board |
ditto |
ditto |
ditto |
|
|
Battery room |
ditto |
ditto |
ditto |
ditto |
|
4 |
Chemical Water Treatment Plant |
|
|
|
|
|
|
Water treatment plant |
Anti-rot tile |
Anti-rot paint |
Anti-rot paint |
Aluminium alloy window and steel-plate door |
|
|
Laboratory |
ditto |
ditto |
ditto |
ditto |
|
|
Chemical dosing room |
ditto |
ditto |
ditto |
ditto |
|
|
Control room |
PVC plastic floor or floor tile |
Paint |
Gypsum |
ditto |
|
|
Distribution room
|
Tile |
ditto |
ditto |
ditto |
8.4. Designs uses main engineering data
1）The basic wind pressure values are left vacant for the time being.
2) The earthquake resistances intensity 7, the design basic earthquake acceleration considered as the 0.10g.
8.5 Main building materials
1）Concrete:C20~C30, C10 used for the foundation mat.
2）Steelwork: grades of structural steel and steel plate are Q235 and Q345.
Steel bar: HPB235, HRB335, HRB400.
3�?nbsp; Cement: Portland cement ISO42.5~52.5.
4）Bricking-up: according to the local materials.
5）Fire protections coatings: Used for the steel structure.
6）Waterproofing materials: mix addition agent with concrete structure from the waterproofing.
7）Anticorrosive materials: Used for all of the steel structure, chemical water treatment system pits and trenches.
8）Profilings steel sheet: Double-decked compound profiling steel sheet, single-layer profiling steel sheet.
8.6 Grounds and Foundation
Inspect the judgment according to the existence information and the scene, no expansive soil, no liquefied soil. Further determines on soil category and ground grade and so on have to be made in the future.
8.7 Structural Design
8.7.1 Mainly constructions
1) The central control building
The central control building is reinforced concrete framework, total length is 50.00m, width is 8.50m.There is ±0.00m floor (bottom level), 5.00m (roof layer).
In this building the bottom level is equipped with the control room, the electrical power distribution room, the battery room.
2) The chemical water treatment building
The chemical water treatment building is the L shape arrangement monolayer reinforced concrete framework, total length is 45.00m and width is 35.00m, height is 10.00m.There is chemical water treatment room, the transformer room, the medicine room, the chlorine manufacture shop, the examination lab.
3) Office building
The office building is two reinforced concrete framework, total length is 30.00m, width is15.00m.There is ±0.00m(bottom layer), 3.60 (intermediate layer), 7.20m(roofing layer).
4）gas turbine foundation
Large reinforced concrete foundation
8.7.2 Annexes
1) material and overhaul, single-layer frame, height 7.0m, 24mx10m.
2) security guard and reception room, single-layer frame, height3.3m, 6mx4m.
3) unit gas scrubber skid, single-layer frame, height6.0m, 20mx12m.
4) clarified water pump clarified water tank，Large reinforced concrete foundation
8.7.3 Electrical constructions
1) Diesel Engine Room
single-layer frame, height 6.0m, 18mx8.5m.
2) Transformer oil pit
The main transformer, the common/backup transformer foundation applied with the reinforced concrete foundation, fire protect wall settled between each other.
3) Outdoor power distribution equipment
The 161kV power distribution equipment framework uses galvanizes the anticorrosion steel pipe Λ-sharp column structure and the triangle trellis type steel girder, the reinforced concrete foundation.
9 COMMUNICATION PART
9.1 General Description
The whole communication system is designed and installed in accordance with the following codes and standards:
ITU-T International Telecommunication Union-Telecommunication
IEC International Electromechanical Commission
ISO , International Standard Organization
9.2 Telephone System
This system shall consist of PABX (Private Automatic Branch Exchange) and the auxiliary equipment, MDF (main distribution frame), distribution terminal equipments, cable network, etc. It shall not only provide the communication among designated locations in the power station, but also realize the external communication with the dispatching center, the local public telephone network and power system communication network.
In the project, The capacity of the PABX is 100 extensions and can be expandable.
The design interface of linking to the public telephone network is at the MDF(Main Distribution Frame).
9.3 Intercommunication paging/party system
The system consists of center exchange, main control terminal, indoor stations, outdoor stations, amplifiers, loudspeakers, distribution equipments and cable network, etc. In this project, one set of Intercommunication paging/party system with 20 intercom stations shall be supplied to cover the designated locations of the power plant.
The system can accomplish two-way communication by the page/party function and spread message, alarm signal at the same time, and it is easy to find the shifting staff by the broadcasting function.
9.4 Mobile Radio System
10 sets of walkie-talkies shall be supplied to realize communication between operators and the shifting stuff or the remote area.
9.5 Distribution Equipment and Cable Network
The cable network for the PABX communication system shall include MDF(Main Distribution Frame), cable distribution boxes, junction boxes, telephone sockets, cables and wires.
The cable distribution boxes and junction boxes shall be arranged indoor or outdoor as required.
Cables shall be laid along with electrical cable trench or tray, etc; in case electric cable trench and tray are not available, cables shall be laid through tubes.
9.6 Communication Power Supply and Communication rooms
The power supply system consists of one set of 120A/-48V high frequency switch power equipment and two banks of 300Ah/-48V maintenance-free batteries. The power for paging system is supplied by A.C UPS.
Communication rooms shall be in the control building and include communication equipment room and batteries room.
10 VENTILATION AND AIR CONDITIONING
10.1 System Functions
Ventilating systems will be designed to supply and/or exhaust air to assure reliable equipment operation, to facilitate maintenance activities and to control the spread of contaminated air to adjacent spaces.
10.1.2 Air Conditioning System
Air conditioning systems will be designed to maintain specified temperature, humidity and air quality, in order to provide comfortable working conditions for operators, and to maintain the electronic and data processing equipment in good conditions.
10.2 System Description
10.2.1 Ventilation
Mechanical exhaust systems with axial fans for emergency will be provided for the high-voltage distribution rooms or low-voltage distribution rooms The rate of air exchange will not be less than 12 times per hour for these exhaust systems.
Ventilation equipments for distribution rooms will be shut down automatically to avoid the spreading of fire when fire occurs in these rooms.
Chemical dosing room, chemical storage room will be served with natural suction and mechanical exhaust ventilation by anti-corrosive & explosion-proof axial fans to discharge the poisonous gases to the outside. The air change rate will not be less than 15 times per hour.
Testing rooms and analysis rooms will be provided with natural suction and mechanical exhaust ventilation systems by axial fans with an air change rate not less than 6 times per hour.
10.2.2 Air Conditioning
Central Control Room and Electronic Equipment Room will be served with a year-round air conditioning system so as to maintain indoor temperature 26±1℃（hot season），and relative humidity at 50±10%. The system will consist of two air-cooled air conditioning units, supply/return air ducts (one unit in operation, another on standby), air registers or diffusers, dampers etc.
Air-condition system may be designed for local control rooms, Office Building and offices in other Buildings according to the required temperature.
The System covers the Fire Detection and Protection System for 3´6B Gas Turbine Generator power plant in Xxxxx.
The system will include the following sub-system:
l Fire-fighting water supply system
l Outdoor hydrants system
l Indoor hydrants system
l Fixed water spray system
l CO2 gas extinguishing system
l Foam extinguishing system
l Portable fire-fighting equipment
l Fire detection and alarm system
The structural and process-related fire protection measures serve both to protect the plant operating personnel and the fire brigade, and to reduce/minimize the potential for damage by fire.
The system described herein, takes into account combustible material that include the following:
· Fuel fired at the plant
· Lubricating oil, seal oil, control oil
· Material used for electrical equipment
NFPA - National Fire Protection Association
NFPA-850 Electric Generating Plants & High Voltage Direct Current Converter StationsFire Protection for Fossil Fueled Steam & Combustion Turbine
NFPA-10 Standard for Portable Fire Extinguishers
NFPA-11 Low expansion foam system
NFPA-14 Standard for the Installation of Standpipe & Hose Systems
NFPA-15 Fixed water spray system
NFPA-1961 Fire Hose
NFPA-20 Carbon dioxide system
NFPA-1963 Fire Hose Connections
NFPA-24 Standard for the Installation of Private Fire Service Mains and Their Appurtenances
The scope of fire fighting system design and supply will include the whole plant area, it includes GTG area, transformer area, switchyard area, control building, work house, administration building and other auxiliary areas.
11.4.2 Fire Fighting Water Supply System
Independent fire water supply system will be provided for the plant. The system includes water storage basin, fire-fighting pumps, pump house and piping, etc.
There are one 100% motor driven fire fighting, one 100% diesel fire fighting pump and two jockey pumps will supply water to fire-fighting system. The water source will come from raw water balance reservoir and the fire fighting pumps will be set at pump house near the water reservoir. The reservoir capacity will be 1000 m3.
Fire fighting water pipes will be looped around the power area and auxiliary buildings and buried. Underground pipe mains will be steel pipes with diameter of DN200, the measures against corrosion will be considered.
11.4.3 Outdoor Hydrant System
The hydrant will be installed on the water supply pipe mains. The distance of the hydrants is no more than 80 meters.
11.4.4 Indoor Hydrant System
The indoor hydrant system will be designed to provide fire fighting at each floor of buildings in plant.
The arrangement of hydrant can ensure two water-streams can reach any place simultaneous. Location of hydrant should allow for ease of access to operate. Isolating valve will be provided at each hydrant to allow for ease of maintenance.
11.4.5 Fixed Water Spray System
Fixed water spray system is used to protect main transformers.
11.4.6 Foam Extinguishing System
A low expansion foam system will be provided to protect the fuel oil tank area.
11.4.7 CO2 Gas Extinguishing System
High pressure CO2 gas extinguishing system will be provided to protected the GTG enclosure.
11.4.8 Portable & Moveable Fire Extinguishers
The portable & moveable fire extinguisher system will be designed to extinguish the initial fire at the hazardous areas.
11.4.9 Fire Detection & Alarm System
Fire diction and alarm system will provided for the whole plant according to the codes requirement
China National
Electric Wire&Cable Imp./Exp. Corp
