| section two CO-generation power station design
1. General
1.1 Composing
Heat-electricity co-generation consisted mostly of following part: six QDR20 gas turbine electricity generator sets, six 6.3t/h waste heat recovery boilers, tow 15t/h natural gas boilers and so on. The inclusion of natural gas room, high voltage room, low voltage room, control room, flue, chimney and otherwise.
1.2 Technical data of the power station master equipment(ISO standard atmosphere condition):
| Unit generate power: |
6x2000KW = 12MW |
| Voltage: |
6.3 kV |
| Frequency: |
50 Hz |
| Waste heat recovery boiler steam output: |
66.3 t/h = 37.8t/h |
| natural gas boiler steam output: |
215 t/h = 30t/h |
| Steam pressure: |
1.0MPa |
| Steam temperature: |
190°C |
| One gas turbine gas consumption: |
908Nm3/h |
| One natural gas boiler gas consumption: |
1072Nm3/h |
| Yawp: |
�?5dBA |
1.3 Planar disposal
According to user request the all power station area is about 110×49=5390m2.
The master equipment of power station arranged in line. All round is annular way. The six QDR20 gas turbine electricity generator sets set for gather to pack the pattern. The set is open-air to be alongside of to arrange, the each pedestal is apart from to 6 meters. 16 bolts fixed on the ground of engine base connect to civil base. Six 6.3t/h Waste heat recovery boilers is whole steeliness in the open air. Two 15t/h gas boilers set in the civil boiler room. High voltage room, low voltage room and control room all set a civil workshop, the high voltage room and the low-tension room are on the first floor, and the control room is on the second floor, they connect to generator trench or cable tray.
2. FUEL SYSTEM
2.1 The fuel system can supply natural gas fuel with stable pressure and appropriate temperature by purifying, supercharging and transporting natural gas fuel in order to meet combustion requirements of gas turbine engine and natural gas boiler.
2.2 Technics flow
Natural gas fuel with 0.09MPa supplied by user is divided into two route fuel after through prefilter. A part of natural gas fuel is delivered to natural gas boiler and decompressed to 0.02MPa for using of natural gas boiler. Other part of natural gas fuel is supercharged by natural gas compressor and cooled by cooler to 0.9MPa, 50°C , then is supplied to 6 QDR20 gas turbine engine generator set.
2.3 Main parameters of natural gas fuel is as follows:
Medium : natural gas
Fuel gas pressure before supercharging : 0.09MPa
Fuel gas pressure : 0.9MPa
Fuel gas temperature after supercharging: 50°C
Fuel gas caloric value : �?36.16MJ/Nm3
Fuel gas flow : 9100Nm3/h
Fuel gas filtration precision: <10μm
2.4 Fuel system makeup
The fuel system mainly consists of three natural gas compressors with assistant equipments (two using and one spare-using), two separating pre-filter (one using and one spare-using), two fine separating filter(one using and one spare-using), two reduction pressure valves, several gate valves, several stop valves, instruments and piping etc.
3. The cooling water
Cooling water is used to cool lubricating oil of gas turbine engine and generator. in addition, boiler water feed pump and sampling cooler also need cooling water.
Cooling water can mostly uses with circulation and reclaiming except for wastage of a little drains.
The cooling water system mainly consists of piping and valves. Piping includes feed water piping, backwater piping and all sorts of branch piping supplied for using. Valves mainly consists of ordinary gates valves or stop-valves, but electro-mode adjustable valve is set on cooler water feed entrance of gas turbine engine lubricating oil and generator lubricating oil to control lubricating oil temperature by adjusting cooling water flow in the control room.
cooling water parameters see the next table:
|
Sequence Number |
Item |
Parameter required |
|
1 |
Turbidness degree |
�?0FTU |
|
2 |
Ph(25°C) |
Normally is 7-9�?/SPAN> no lower than 6.5 |
|
3 |
Carbonate rigidity |
�?mg equal quantity/L |
|
4 |
Total rigidity( calculated as CaO ) |
�?.5mmol/L |
|
5 |
Total soluble solid |
�?000mg/L |
|
6 |
Oil content |
�?mg/L |
|
7 |
Organisms content |
�?5mg/L |
|
8 |
Conductance ratio |
�?000μs/cm |
|
9 |
Feed water temperature |
�?0°C |
|
10 |
Feed water pressure |
�?.35Mpa |
|
11 |
Circulation flow |
350m3 /h |
|
12 |
Wastage |
10 m3 /h |
4. Boiler system
Boiler system consist of the waste heat recovery boiler and natural gas boiler. Both boiler use soft water from one deoxidizing equipment .
Requirement of Soft water is as follow:
|
No. |
Item |
Parameter required |
|
1 |
Suspending substance |
�?mg/L |
|
2 |
Total rigidity |
�?.03mmol/L |
|
3 |
Total alkalinity |
�?mmol/L |
|
4 |
Ph(25°C) |
�? |
|
5 |
Soluble Oxygen |
�?.1mg/L |
|
6 |
Oil content |
�?mg/L |
|
7 |
Iron content |
�?.3mg/L |
|
8 |
Pressure |
�?.35MPa |
|
9 |
Feed water temperature |
15°C |
|
10 |
Supply quantity |
72.5 t/h |
4.1 the waste heat recovery boiler
The particular description of waste heat recovery boiler see section one.
4.2 Natural Gas Boiler
The main equipment of natural boiler: boiler body , economizer, burner, fan, water feed pump, flue, sampling set, boiler blowdown tank, pipe, valve and control instrument
Technical performance of natural gas boiler :
Temperature of steam: 190°C
Pressure of steam : 1.0MPa
rated capacity:15 t/h
Wastage of gas :1072 Nm3/h
natural gas Pressure :20-30kPa
Temperature of exhaust gas: �?30°C
5. High voltage system
The whole High voltage system is designed and provided by the purchaser.
The generator stator output cables are 6, separately connected to 2 junction boxes on generator each side. In 6 cables, 3 are electricity power ( U, V, W 3 phases ), the other 3 cables are generator neutral cables.
The generator protection signal , current, voltage, electricity network voltage signal will send to GTCON2000 controller. The controller realize generator protection and display voltage and current value in HMI. and control the generator output breaker close and trip .
generator protection as follows:
Generator main protection: Differential protection
Generator backup protection: over current, over voltage, under frequency, under insulation.
The signals need contacts type. The generator output breaker need send 4 normal open and 4 normal close contacts signal.
When the generator is in rated state, 3 phase current signal is 5A, 3 phase voltage signal is100V.
When the electricity network voltage is in rated state, 3 phase voltage signal is 100V.
6�?/FONT>Motor control center
Motor control centre supply electrical energy to pumps, heaters, control instruments,
6.1 Motor control centre
project load as follows table:
Project load list
|
|
Start cubicle |
Workshop lighting |
Recovery boiler feed water pump |
Gas fired boiler feed water pump |
Gas fired boiler ventilation fan |
Deoxidize water pump |
Direct current cubicle |
total |
|
Power(kW) |
90 |
60 |
22 |
22 |
75 |
7.5 |
5 |
|
|
number |
2 |
1 |
3 |
3 |
2 |
1 |
1 |
|
|
work number |
2 |
1 |
2 |
2 |
2 |
2 |
1 |
|
|
calculate power(kW) |
90 |
60 |
44 |
44 |
150 |
7.5 |
5 |
270 |
|
reactive power(kVar) |
|
|
|
|
|
|
|
202 |
|
Capacity(kVA) |
|
|
|
|
|
|
|
337 |
6.2 Start System
Start system consists of starter and 3-ph, AC, Start System
transducer, it configures 2 AC transducers and 6 start-motors aggregately. Two AC transducers of start system can spare each other. usually, one AC transducer can start six engines separately.
Frequency of AC transducer is controlled by speed of engine in startup. Frequency change rate of AC transducer is bigger than speed change rate of engine for that generators start up all right.
7. DC system
7.1 General
24VDC control power supply of six engines is provided by DC cubicle, secondary cells are in DC cubicle. The power supply of DC cubicle is provided by two 220VAC powers supply, it output by the reclosers.
It provide for 24VDC control power supply of engine and 24VDC emergency supply power of fire Extinguishing system.
7.2 DC cubicle introduce
Master technical parameter of DC cubicle as follows:
Input power supply :two powers supply, voltage is 220±10%V, frequency is 50±1HZ.
output voltage rating: DC 24V. charge voltage: 27V.
commutate output current:100A
capacity of secondary cells:40Ah.
Work temperature: -5°C-+40°C, everyday average temperature�?5 °C.
Secondary cells of DC cubicle are maintenance-free. after it is used, except charge and discharge, it does not usually need maintenance.
Secondary cells of DC cubicle have two ways of charging, that are normal average charge and online charge. Usually, secondary cells are online charge.
8. Concentrating display system
The whole power plant equips one background computer. The background computer can concentrating display all parameters of 6 QDR20 package and 2 gas fired boiler. The background computer monitoring software is INTOUCH configuration software. The background computer communicate with 6 HMI and gas fired boiler controller via Ethernet, communication protocol is DDE.
Concentrating display network figure as follows :
EMBED AutoCAD.Drawing.16
9. Fire control
9.1. Fire control of the QDR20 package
In order that QDR20 package can run safely and reliably, the package equips fire control eatablishment as follows:
Inside the QDR20 package container: adopt CF3CHFCF3 automatic extinguishing system.
Outside the QDR20 package container: outside the container, hang CO2 portable extinguishing cylinders.
9.2. Power plant fire control
The whole power plant is situated at a chemical plant,
So the fire control establishment of the power plant should equipped according to chemical plant fire control establishment in existence. But at least have fire control establishment as follows:
(1). outdoor hydrant
(2). indoor hydrant
(3). mobile extinguishing equipment (portable or go-cart) (4). Round fire control
10. Enviroment protection
10.1. Adoption standard and criterion
Can refer to the power plant local or both sides agreed standard and criterion.
10.2. The influence of package on enviroment
When the QDR20 gas turbine co-generation package running, it will influence of ambience on noise, exhaust gas, waste water, waste oil etc..
10.3.environment protect measure
10.3.1. noise
Gas turbine co-generation power plant main noise source is gas turbine engine. Because the gas turbine engine noise is loud and frequency scope is wide, the key to the whole power plant noise managing is control the transmission of the gas turbine engine noise and vibration. Gas turbine engine take measures as follows to manage noise:
Gas turbine engine is installed a separate sealed enclosure with sound insulation and absorption to prevent gas turbine noise transmitting outside directly.
All airflow channels on Gas turbine engine enclosure install silencer, such as air inlet filter system, ventilation system etc..
For preventing vibration ,all conduits connecting to gasturbine engine adopt soft connection, for example that inlet duct adopts canvas to connection, exhaust duct adopts ripple duct expansion joint to soft connection, engine Lube oil duct and gas duct adopt soft duct to connection.
Gas turbine acoustic must be airproof, including gate, window,hole, connection of acoustic and base.
Base of gas turbine generator sets adopt to segregate vibration. Other assistant power equipment must be low-yawp .as follow fan motor, pump etc.
So yawp and vibration of gas turbine engine powerstation is better, yawp is no over 85dB(A).
10.3.2 . Waste Gas
After natural gas is burned ,waste gas contents :CO2, H2O, O2 and SO2, NOX etc. CO2,H2O, O2 is no nocuous gas, SO2, NOX is nocuous gas.
Because NOX have contact with temperature of gas turbinefirebox main burning part, in gas turbine engine design,through choose appropriate temperature of main burningpart control NOX production. Base account and result of existing gas turbine engine generator set, output content of NOX<47mg/m3.
Natural gas is cleanly fuel, and it is cleansed, sulfide content is low( HS content�?0mg/Nm3 ). fuel waste of one gas turbine is about 908Nm3/h, It is calculated that SO2 output content of every gas turbine engine is about 0.31mg/m3.
Waste gas goes through chimney stack of 15m to meet drain requirements.
10.3.3 Control measure of let waste water and waste oil
(1) Sewage drain of every waste heat recovery boiler is about 0.3t/h, and sewage drain of every natural gas boiler is about 0.5t/h. The temperature is about 184°C. Before the feedwater put in the boiler through a series of processing, it has no use for enter any medication at running. At first the sewage drain in the sinkhole, and then cooling drain in barrel-drain
(2) The cooling water of power station repeat use, it has no use fordrain.
(3) Waste oil
10.3.4 Vibration safety
Gas turbine was test running before leave factory, the vibration is not excess 2.5g.
Civil work of base use measure of separate vibration.
The gas turbine engine generator set fix the meter of watch, it will give an alarm when the vibration excess 3.5g of the gas turbine engine generator set.
It will come into being a little waste oil (about 11kg/week) at the running and repair of gas turbine engine generator set. Reclaim in the jerrican of operator, after the exceed the certain quantity send on the customer specify of purify station, drain it when the up to par.
10.3.4 Vibration safety
10.3.4 Gas turbine was test running before leave factory, the vibration is not excess 2.5g.
Civil work of base use measure of separate vibration.
The gas turbine engine generator set fix the meter of watch, it will give an alarm when the vibration excess 3.5g of the gas turbine engine generator set.
10.3.5 Station virescence
10.3.5 The virescence have especial effect of depollution and improve environment. The can adjust temperature, clean the dust, purify atmosphere, weaken noise. Develop virescence of power station when build the power station, grow the tree of the feat growth side of the way, lay green fencing and shrub under the conduit, grow greensward and flower around the workshop. |
China National
Electric Wire&Cable Imp./Exp. Corp
