Technical specification of 2 MW Diesel Generator Set for pwoer plant from China
2.1 CLIMATIC CONDITIONS
2.1.1 ISO Conditions
. Air temp. to turbocharger inlet 27 deg. C
. Atmospheric pressure 750 mm Hg
. Relative humidity 60 %
. Water temp. at charge air cooler inlet 27 deg. C
2.1.2 Site Conditions (Assumed)
. Air temp. to turbocharger inlet 45 deg. C
. Atmospheric pressure 750 mm Hg
. Relative humidity 60 %
. Water temp. at Cooling tower outlet 32 deg. C
2.2 Rating of the D.G.set
2.2.1 Under above mentioned site conditions
---------------------------------------------
Rating at Alternator Rating at
engine efficiency alternator
crankshaft terminal(MCR)
KWm ( % ) KWe KVA
(0.8 pf)
---------------------------------------------
Nominal 2206 90.7 2000 2500
Running
-----------------------------------------------
Note : COP rating will be 90 % of MCR
3 DIESEL ENGINE
3.1 TECHNICAL DATA
Technical particulars for the diesel engine are as follows:
. Number of cylinders 8
. Arrangement of cylinders In Line
. Bore (mm) X Stroke (mm) 300 X 380
. Type 4 stroke, single
acting, direct
injection/turbocharged
charge air cooled
. Rotational speed 600 RPM
. Mean effective pressure 20.5 Bar
at rated power & speed
. Mean piston speed 7.6 m/sec.
. Rotation as seen from Clockwise
coupling side.
. Swept volume per cylinder 26.875 litres
. Combustion chamber volume 2.067 litres
. Compression ratio 13:1
. Avg max. combustion pressure 130 bar
(at rated power/speed)
3.2 Power rating
3.2.1 Rated power under ISO Conditions mentioned in 2.1.1
. Maximum continuous rating (MCR) 3000 HP
at engine crankshaft
. Corresponding rotational speed 600 RPM
3.2.2 Under the following limiting ambient conditions :
. Air temp. at turbocharger inlet 45 deg. C
. Water temp. at charge air cooler inlet32 deg. C
Deration to power applicable for engine 0 %(nil)
Beyond the abovementioned limiting conditions, deration to power as per ISO 3046 will be applicable.
Rated Power under site conditions mentioned in 2.1.2
. Maximum continuous rating (MCR) 3000 HP
at engine crankshaft
3.2.3 The engine should be capable of accepting a sudden load as per the guidelines in ISO-8528-5-1993(e). As per this standard, the maximum sudden load increase stages are
Baseload % Sudden load increase to %
---------------------------------------------------
1st Stage 0% 40 40%
2nd Stage 40% 30 70%
3rd Stage 70% 20 90%
4th Stage 90% 10 100%
During each of the above-mentioned stages of sudden loading, the transient speed drop will be restricted to a maximum value of 10% of the rated speed.
3.3 FUEL AND LUBE OIL
3.3.1 Fuel
Each of the engine offered should be suitable for operation on Fuels: HFO / DO.(max. viscosity 700 cst at 50 deg.C.)
Fuel consumption:
The hourly rate of fuel consumption per Metric Horse Power delivered at the crankshaft flange at rated power & speed (after running in of the engine & for engine with driven raw water, fresh water & lube oil pumps ) is 145.00 gms, when engine operates at Maximum Continuous Rating (MCR).
FUEL CONSUMPTION (with 3 driven pumps)
====================================================
G8300ZD8 Consumption at
(600 RPM) engine Cr.shaft
gm/hp/hr
====================================================
100% Load 145.00
SITE -----------------------------------------------
75% Load 148.00
CONDITION-------------------------------------------
50% Load 155.00
====================================================
The values are subject to a 3% tolerance and apply when burning fuel with a net calorific value of 10,200 KCal/Kg minimum.
3.3.2 Lubricating Oil:
Oil sump capacity (ltr)
The engine is equipped with a dry sump attached to the bottom of the crankcase. The lube oil for the engine is stored in a separate tank positioned away from the engine. This arrangement offers much more reliability than the wet sump arrangement & also increases the time between oil changes.
The total oil capacity of this lube oil tank is 2000 ltrs.
Lube oil consumption
The average lube oil consumption is 1.6 gm/kwh (+/- 0.2 gm/kwh) at MCR at crankshaft for a well-run engine.
Continuous centrifuging is essential for lube oil when operating on Furnace Oil.
3.4 SCOPE OF SUPPLY (STD)
3.4.1 Starting air circuit
3.4.1.1 Equipment fitted on the engine:
Compressed air starting equipment including:
- One rotary distributor
- One air starting valve in each cylinder head
- Connecting air piping on the engine
3.4.1.2 Equipment delivered loose:
- One air compressor air
- One air bottle of 500 ltrs (30 bar) capacity. This capacity is enough to start the engine 7 times without intermediate refilling of the receiver.
- Complete interconnecting piping with flanges, fasteners, valves, non-return valves, bosses, supports, etc as necessary.
3.4.2 Lube Oil Circuit:
3.4.2.1 Equipment fitted on the Engine:
- One engine driven lube oil supply pump
- One engine driven lube oil transfer pump
- One pressure regulating valve
- One lube oil thermostatic valve (option)
- Complete interconnecting piping with flanges, fasteners, valves, non-return valves, bosses, supports, etc as necessary.
3.4.2.2 Equipment delivered loose:
- One tank for lube oil (2000 ltrs capacity) with interconnections to the engine
- One electric motor driven lube oil-priming pump (option)
- One manual lube oil-priming pump
- One lube oil cooler
- One centrifugal lube oil filter (FLL75 bypass type)
3.4.3 Cooling Water Circuit
The engine cooling is achieved by close cooling water circuit.
A) Close Loop circuit:
Drawn by the water pump from the radiator, the cooling water flows to the air cooler, and to the injector cooling oil cooler if provided and to the lube oil cooler, and then enters the inlet water main pipe and the turbocharger. The cooling water is discharged out through the outlet water main pipe. Between the inlet water main pipe and the outlet water main pipe there is a thermostatic valve with a sensor at the engine outlet water main pipe, which by-passes part of the outlet water to the inlet of the water pump to keep the water temperature to be not too low. Finally the water is cooled in the radiator.
B) Injector cooling:
A separate tank contains lube oil for injector cooling circuit. An engine-driven pump circulates lube oil through all injectors and an injector cooler carries out the heat transfer. After cooling the injectors, the lube oil returns to the separate tank.
3.4.3.1 Equipment fitted on the engine:
- One electrical water pump
- One engine driven injector cooling pump
- One water thermostatic valve
- One water-cooled charge air cooler
- Injector cooling circuit pipes
- Injectors with cooling pipe connections
3.4.3.2 Equipment delivered loose:
- One radiator
- One injector cooler
- One separate tank
- One dosing arrangement for water system (for each D.G. Set)
3.4.4 Fuel Circuit
While starting or stopping the engine DO (Diesel Oil) is used as fuel. When the water temperature at inlet to engine is more than 60 deg.C and the HFO (Heavy Fuel Oil) is heated to the required temperature, the fuel can be changed from DO to HFO through a 3-way fuel valve.
3.4.4.1 Equipment fitted on the engine:
- Individual fuel injection pump for each cylinder with fuel rack & linkages.
- Individual injector fitted on each cylinder head
- High-pressure injection pipes
- Main fuel rails for feeding and return.
- High-pressure pipe connection for each cylinder
3.4.4.2 Equipment delivered loose:
1) Two HFO separator (one for working, one for standby)
2) One fuel viscosity control unit (booster) consisting of:
Two electric motor driven fuel feed pump (one for working, one for standby);
Two electric motor driven fuel booster pump (one for working, one for standby);
One duplex type coarse filter;
One pressure-regulating valve;
One steam heater for HFO;
One flow meter for HFO;
One 3 way fuel changeover valve;
One viscosimeter & temp controller;
One emergency pressure safety valve;
One duplex type fine filter;
one mixing vessel with safety valve;
One pressure-regulating valve in fuel return;
- Complete interconnecting piping with flanges, fasteners, valves, non-return valves, bosses, supports, etc as necessary up to Day Tank.
3.4.5 Air intake & Exhaust system
3.4.5.1 Equipment fitted on the engine:
- Lagged set of exhaust manifold with expansion bellows
- One ABB turbocharger.
- Exhaust outlet connection with expansion bellow.
3.4.5.2 Equipment delivered loose:
- One air filtration system with air ducting
- Exhaust ducting with necessary expansion bellows
- One exhaust silencer
- Insulation /lagging/cladding for exhaust ducting
3.4.6 Compressed Air Circuit for Over-speed Protection
3.4.6.1 Equipment fitted on the engine:
- One pneumatically operated safety valve in the engine fuel pipe shuts off the fuel in case of engine over-speed.
3.4.6.2 Equipment delivered loose:
- See 3.4.1.2.
3.4.7 Control and measuring instrument:
3.4.7.1 Equipment fitted on the engine:
- One YT111 type hydraulic governor.
- One servobooster with piping for governor
- Exhaust gas pyrometric system with thermocouple for each cylinder for turbine inlet & turbine outlet with pyrometric duct.
- One engine barring arrangement (manual) with safety arrangement for detecting engaged barring gear.
- Arrangement for manual stopping of the engine with safety arrangement for detecting locked hand stop control.
Note: All electrical equipments installed on the engine are electrically wired up to one or more terminal strips attached to the common baseframe. Connections for remote pressure detection are also grouped together on the baseframe.
3.4.8 Miscellaneous equipments.
3.4.8.1 Equipment fitted on engine:
- Individual cylinder head for each cylinder, each containing two inlet and two exhaust valves (with valve rotators).
- One torsional vibration damper
- 4 nos of explosion relief valves on crankcase.
- One flywheel & coupling arrangement with necessary fasteners.
- One common baseframe for engine & alternator with coupling guard, fasteners, anchor bolt etc.
NOTE
The system is designed for max 380 cst fuel at 50 degree C since this is the most commonly available fuel. If fuel of higher cst is to be used, then please furnish the specifications of the fuel for proper designing of the system. In this case there will be change in certain auxiliary equipment specifications and a corresponding increase in price.
4. Complete electrical system includes
1) Alternator
2) Control Panel for Generator
3) Operation Panel for Generator
4) Local control desk
5) Air Circuit Breaker panel
6) Battery Charger and Batteries (24V/220VDC)
7) Control panel for gen-set auxiliaries
1. Alternator
Alternator is self-excited, brush less type in two bearing construction with single shaft extension and IP 23 enclosure. Alternator is fitted with bearing temperature detectors.
Technical data of Alternator
- Rated KVA 2500 KVA
- Power factor 0.8 lag
- Max. Alternator output at site 2000 KW
- Duty Continuous
- Rated speed 600 RPM
- Output voltage 11000 V
- Efficiency at 100% load and 0.8 PF 90.7 %
- Direction of rotation anticlockwise
- Number of poles 10
- Rated frequency 50 Hz
- Over-speed 20% for 2 minutes
- Overload capacity and duration 10%, for max. 1 hr in every 12 hrs
- Insulation class F
- Enclosure IP 23
- Temp. rise class F
- Excitation and AVR type Brush-less, AVR
- Connection Star
NOTE
Alternator design considers harmonics in load.
2. Control Panel For Generator & Operation Panel For Generator
2.1 Function
Control Panel and Operation Panel provide necessary Monitoring, Control and Protection functions for the DG set. It is located in the DG control room.
2.2 Major Components
1) Programmable Logic Controller (PLC)
2) Generator Protection relays锛圫IEMENS锛?/FONT>
3) Automatic Voltage Regulator
4) Meters, indicators, hour counters
5) Push buttons, selector switches
6) Engine Frequency Monitoring Unit
2.3 Metering Devices
7) Analog Engine RPM meter
8) Ammeters (3 nos.)
9) Voltmeter with selector switch
10) Frequency meter
11) PF meter
12) Analog Excitation fundamental ammeter
13) Analog Excitation harmonics ammeter
14) Counter for running hours
2.4 Generator Protections
15) Differential
16) Voltage controlled over current
17) Under / Over voltage
18) Under / Over frequency
19) Earth fault
20) Very high Alternator bearing temperature
21) Reverse power
22) Field failure
23) Master trip
2.5 Status Indications
24) Low lube oil priming pressure
25) Breaker engaged
26) Engine start permission
27) Unit ready for excitation
28) HFO operation not possible
29) PLC failure
30) Ready for excitation
31) DG breaker ON
32) DG breaker OFF
33) DG breaker Tripped
2.6 Alarm Indications
34) Low lube oil pressure
35) Low water pressure
36) Low fuel pressure (in booster control box)
37) Low start air pressure
38) High lube oil temperature
39) High water temperature engine inlet
40) High fuel temperature engine inlet (in booster control box)
41) Alternator bearing temperature high
2.7 Trip Indications
42) Very low lube oil pressure
43) Very high lube oil temperature
44) Very high water engine outlet temperature
45) Engine over speed
46) Emergency stop
47) Speed sensing failure
48) Alternator fault
49) Differential
50) Under / over voltage
51) Under / over frequency
52) Voltage controlled over current
53) Earth fault
2.8 Controls possible
- Engine speed raise/low
- Engine start
- Engine normal and emergency stop
54) Excitation ON / OFF
55) Excitation Raise / Low
56) Excitation adjust
57) Breaker control
- Fault indication
- Lamp test
- Reset
3. Local Control Desk
,
3.1 Function
Local Control Desk (LCD) is provided for monitoring Pressure and Temperature parameters of the engine. Also starting, stopping and speed control of engine is possible in local Control operation mode. It is located near the engine.
3.2 Major Component
58) Pressure gauges, switches
59) Temperature indicators or scanner
60) Scanner for Engine exhaust temperatures
61) Push buttons, indicating lamps, selector switches
62) Flasher
3.3 Pressure Gauges
63) Lube oil filter inlet pressure
64) Lube oil filter outlet pressure
65) Lube oil cylinder head inlet pressure
- Fuel engine inlet pressure
- Starting air pressure
- Water engine inlet pressure
3.4 Pressure Switches
66) Lube oil engine inlet pressure
3.5 Temperature Indicators / scanner
67) Lube oil engine inlet temperature
68) Lube oil engine outlet temperature
69) Water engine outlet temperature
70) Water engine inlet temperature
71) Exhaust gas temperature for each cylinder
72) Exhaust gas temperature for turbocharger
73) Water temperature for each cylinder
3.6 Misc. Indications
- Engine RPM indicator
- Common engine alarm
- Engine start permission
3.7 Controls possible from LCD
- Local / remote mode
- Engine start / stop
- Flasher off
74) Engine speed raise / low
75) Emergency stop
4. Control Panel For Gen-set Auxiliaries
4.1 Function
Various DG set auxiliaries are fed and controlled through the Control Panel for Gen-set Auxiliaries. It utilizes the concept of compartmentalized, non-draw out type design, which provides total isolation between different feeders. This Panel is located in DG control room.
4.2 Major Components
76) MCCB for incomer
77) Contactors
78) MCCB / FSU
79) Push buttons, selector switches, indicating lamps
80) Voltmeter, ammeter
4.3 Outgoing Feeders
- Lube oil priming pump
- Cooling tower fan
81) Air compressor
82) Lube oil separator module
83) HFO separator module
84) Fuel booster module
85) DO transfer pump
86) HFO transfer pump
87) Standby
88) Standby
4.4 Controls possible from GACP
89) Motor / Feeder ON
90) Motor / Feeder OFF
91) Auto/ Manual (for specific feeders)
5. Battery Charger Panel
5.1 Function
For functioning of devices in Generator Control Panel, LCD etc., 24V/220VDC battery charger of suitable capacity along with Lead acid automotive type rechargeable batteries (2 x 12 V DC) is used. Charger is fully automatic, with trickle and boost charging facility.
5.2 Major Components
92) Transformer
93) Electronic controllers
94) AC/DC ammeter, voltmeter
5.3 Metering Devices
95) Voltmeter (with selector switch) for AC input voltage
96) Voltmeter for DC output voltage
97) Ammeter for load and battery current
5.4 Indications
98) Mains supply ON
99) Float mode / Boost mode
100) Charger Tripped
5.5 Controls possible from Charger
101) Mains supply ON / OFF
102) Initial / Normal charging mode selection
103) Fault reset
5.6 Protections provided for Charger
104) Over load / short circuit / earth fault
105) Over voltage
106) Battery reverse
6. Vacuum Circuit Breaker (for HT generator)
6.1 Function
Vacuum circuit breaker is used to deliver the generated output power to the consumer. It is used for 11KV level of generated voltage.
6.2 Major Components
1) VCB
2) Metering / Protection CT and PT
3) Meters, indicators
6.3 Metering devices
4) Ammeter with selector switch
5) Voltmeter with selector switch
6.4 Indications
6) VCB ON
7) VCB OFF
8) Auto trip
9) Spring charged
6.5 Current Transformers (with 5 amp. secondary)
10) Differential CT
11) Two core Metering / Protection CT (3 nos.) class 1 / 5P10, 20 / 20VA
6.6 Potential Transformers (with 110V AC secondary)
12) Two core potential transformer for Metering/Protection, class 1/3P, 100 /100 VA
5 SPARE & TOOLS
Scope of supply includes.
5.1 - One set of spare parts for the engine for operation and routine maintenance
5.2 - One set of tools for engine maintenance
6 INSPECTION AND TESTING
6.1 Engine testing:
The engine will be run-in at the test bench at worshop before delivery. Subsequent test of 3.5 hours will then be carried out as per following schedule.
. 1/2 Hour at 50 % COP
. 1/2 Hour at 75 % COP
. 2 Hours at 100 % COP
. 1/2 Hour at 110 % COP
For these tests, engine will be coupled to a hydraulic dynamometer and run on DO as fuel. An allowance of 4.5 gm/hp/hr on SFC will be considered for the first 500 hrs of engine operation.
6.2 Alternator testing:
Following Routine tests, as per Annexure will be conducted on the alternator at Workshop.
6.2.1 For generator armature, generator field, exciter armature and exciter field.
. Measurement of resistance.
. Measurement of insulation resistance.
. High voltage test.
6.2.2 Phase sequence test and voltage balance check.
6.2.3 Open circuit characteristics
With generator line voltage recorded against exciter field current.
6.2.4 Short circuit characteristics
With generator line current recorded against exciter field current.
6.2.5 Voltage regulation test
Conducted with AVR in the circuit with reactive loads up to 800 KVA.
6.2.6 Control panel test
Standard routine tests as per the relevant ISO standard.
6.2.7 DG set test.
After D.G.Set installation, online checking of all the auxiliary functioning & fine tuning of fluid circuit pressure/temperature setting is carried out on load. This exercise requires one week (Approx.) for completion. During this time, load for D.G.Set shall be made available by customer as & when required. After completion of above D.G.Set shall undergo the load tests at site, for 4 hours. For this purpose the load is to be made available by the purchaser. During the tests, all the important parameters, as per our standard procedure will be checked & recorded.
7 DOCUMENTATION
The Scope of Supply includes supply of Technical documentation for the supplied equipment.
- Operating instructions for engine, alternator (1 set).
- Maintenance manual for engine (1 set).
- Spare parts catalog for engine.
- Documentation for auxiliaries and electrical system.
- Test reports/certificates for engine, alternator & control panel
NOTE
1) For detailed scope please refer to the scope of supply checklist submitted with this offer.
2) There might be minor modifications in the specifications of equipments mentioned in this document at the time of detailed engineering.
8 PURCHASER'S RESPONSIBILITY
8.1 UTILITIES
8.1.1 Fuel
The fuel of desired specifications shall be provided by the PURCHASER.
In case steam is to be used for fuel heating, a boiler for generating steam to heat HFO in bulk storage tank, settling tank and daily service tank and the fuel piping will have to be arranged. The capacity of the boiler will depend on the storage capacity of bulk storage tank and piping lengths.
8.1.2 Lubricating Oil:
Lube oil selected from the approved list of lube oils is to be made available by the purchaser in the lube oil tank.
8.1.3 Water
The PURCHASER should make available water.
8.1.4 Air
It will be purchaser's responsibility to ensure that the temperature near the engine does not exceed 5 deg C above the ambient. Necessary data of heat radiations shall be provided on request.
A ventilation system can be provided for the powerhouse
Quality of air required inside powerhouse is as follows
Dust content<0.5 mg/Nm3 of which
90% Particles are < 5 microns size
99% Particles are < 10 microns size
100% Particles are < 20 microns size
8.1.6 Electricity
All the auxiliaries for the D.G.Set are suitable for running on 400VAC/3PH/50HZ supply. Power for these auxiliaries is to be supplied by the purchaser.
8.2 CONSUMABLES
Fuel, Lube oil, cooling water, grease, Jacket water chemicals etc. required for normal operation.
8.3 CIVIL WORKS:
The civil works of the power station is NOT in Supplier scope. We will provide the following drawings and technical information, which will assist your civil consultant in designing the foundation and powerhouse.
- General assembly drawing
- Powerhouse layout
- Foundation plan.
- Schematic piping diagram.
Please provide the following data for our information and use:
. Soil bearing capacity
. Dynamic characteristics of soil
8.4 FOUNDATION:
Detail design of the foundation should be made based on the soil bearing capacity at the site by the Purchaser.
8.5 APPROVALS:
It is purchaser鎶?responsibility to obtain all statutory approvals and any other sanctions from the local authorities.
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