to: Inverter for Power Generation
in Category: Application
Category
- Products
-
- Wiki
- Contact us
Inverter manufacturers
sales@inverters.cn
<- - Back to Inverter for Power Generation - ->
Frequency inverters have a great of prospect in application because the inverter can save a large amount of electric energy when they are used for fans.Capacity of the Power Generation is 110MW. After reconstruction of 1# dedust fan, the power of fan increases 525kW. Variable frequency technology is an effective method to save energy. Variable frequency can realize soft start, reduce impact on equipment. In addition, inverter installation is very easy. It only series connects between breaker and motor. No need to change load and motor. It is necessary to use inverter to save energy for ID fan.
Inverter reform
Air flow is controlled by damper in 1# system. Big redundancy power and damper adjusting mode cause high power consumption.
Motor parameters ID fan parameters
model: Y560-8 Y4-73-11-27D
power: 1000kW flow:425700m3/h
voltage: 6kV pressure: 5064Pa
current: 118.6A media ℃: 90℃
frequency: 50HZ
speed: 744r/min
According to practical operation, inverter current can be 100A, 18.6A less than motor rated current 118.6A. After research market, we finally choose Gozuk inverter. The inverter current is 105A.
Bypass cabinet is installed to ensure system stability. When the frequency inverter is broken, motor can be switched to direct on line manually. Bypass circuit is composed of 3 breakers QS1, QS2 and QS3. QS2 and QS3 are interlocked. In variable frequency state, QS1 and QS2 close, QS3 opens. In direct on line state, QS3 closes, QS1 and QS2 open.
In order to protect inverter, we design link lock with QF. Once the inverter is broken, inverter switches off QF. In direct on line state, inverter cancels signal of QF trip-off to make motor run in direct on line.
Frequency inverter can also be equipped with upper PC. The PC is installed in control room. User can start/stop, set speed through PC. PC can show operation data and current state. User can also control inverter through operation platform.
Data Comparison
A:
Load MW | Fan current (A) | Damper opening (%) | A side speed (r/min) | A side frequency (Hz) | pressure (KPa) | Furnace subpressure (Pa) | ||
A side | B side | A side | B side | |||||
65 | 3.6/46.4 | 55 | 100 | 30 | 350 | 23.41 | 3.0 | -20 |
65 | 3.5/45.6 | 55 | 100 | 30 | 350 | 23.41 | 3.0 | -20 |
63 | 3.5/45.6 | 56 | 100 | 30 | 349.3 | 23.41 | 3.0 | -20 |
62 | 3.5/46.2 | 55 | 100 | 30 | 349.3 | 23.41 | 3.0 | -20 |
106 | 30.5/84.8 | 48 | 100 | 5 | 746 | 49.9 | 4.1 | -20 |
109 | 29.8/83.7 | 52 | 100 | 25 | 746 | 49.9 | 4.1 | -20 |
B:
Load MW | Fan current (A) | Damper opening (%) | A side speed (r/min) | A side frequency (Hz) | Pressure (Ka) | Subpressure (Pa) | ||
A side | B side | A side | B side | |||||
60 | 77 | 1.7/42.5 | 60 | 100 | 242 | 16.18 | 3.0 | -20 |
60 | 68 | 3.8/42.4 | 49 | 100 | 299 | 19.95 | 3.0 | -20 |
60 | 58 | 9.6/44.3 | 34 | 100 | 400 | 26.63 | 3.0 | -20 |
60 | 55 | 18.1/49.6 | 20 | 100 | 500 | 33.28 | 3.0 | -20 |
60 | 50 | 32.2/58 | 10 | 100 | 600 | 39.91 | 3.0 | -20 |
93 | 53 | 49.8/70.3 | 20 | 100 | 700 | 46.54 | 3.8 | -20 |
93 | 52 | 61/77.3 | 17 | 100 | 747 | 49.68 | 3.8 | -20 |
Calculation
1) 110MW, energy saved in an hour
ID fan power before reconstruction:
0.9539*6*67*1.732*0.8506=565kw
ID fan power after reconstruction:
0.9539*6*29*1.05*1.732*0.8506=257kw
(565-257)*2=616kw
2) 80MW, energy saved in an hour
ID fan power before reconstruction:
0.9539*6*60*1.732*0.8506=506kw
ID fan power after reconstruction:
0.9539*6*21*1.05*1.732*0.8506=186kw
(506-186)*2=640kw
3) 60MW, energy saved in an hour
ID fan powr before reconstruction:
0.9539*6*55*1.732*0.8506=464kw
ID fan power after reconstruction:
0.9539*6*11*1.05*1.732*0.8506=97kw
(464-97)*2=734kw
#1 yearly work time is 7764h in 2002,yearly energy saved is:
7764* (616*25%+640*50%+734*25%)=5104830Kwh
Price: 0.22yuan/Kwh
Energy saved is: 5104830*0.22=1123100yuan
In addition, because the power factor of Gozuk inverter is up to 0.95 which is much better than motor 0.85. It reduces reactive power and heightens equipment utilization factor. Inverter realizes motor soft start and reduces influence of motor insulation and lifetime.
Conclusion
Energy saving effect of frequency inverter is very obvious, especially in low load. With inverter, motor realizes soft-start. Damper is full open, which reduces vibration and damage. The inverter will be widely used for more and more power plants as its excellent energy saving effect.