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Application in the induced draft fan and powder exhaust fan of fire-power plant.
Summary
In fire-power plants, the fans and water pumps are the most important and most power consumption equipments, which often run continuously under the low load or variable load states for a long time. There is a huge energy saving potential if we can reduce the power consumption by adjusting the running speed of those equipments.
This is a application case of IDrive2000 MV VFD (with automatic bypass function) used in a Hubei Shiyan thermal power plant. Four Drive respectively apply to#1powder exhaust fan, #2 powder exhaust fan, #3 induced draft fan, #4 induced draft fan.
Application
Motor parameters
|
No. |
Parameter |
#1powder exhaust fan |
#2 powder exhaust fan |
#3 induced draft fan |
#4 induced draft fan |
|
1 |
Rated voltage (V) |
6000 |
6000 |
6000 |
6000 |
|
2 |
Rated current (A) |
33.8 |
34.6 |
35.2 |
33.8 |
|
3 |
Rated frequency (Hz) |
50 |
50 |
50 |
50 |
|
4 |
Rated power (kW) |
260 |
260 |
260 |
260 |
|
5 |
Speed (r/min) |
1485 |
1390 |
1500 |
1485 |
|
6 |
Power factor |
0.84 |
0.83 |
0.82 |
0.84 |
Drive Operation parameters:
|
No. |
Motor |
Output frequency (Hz) |
Output current (A) |
Efficiency |
|
1 |
#1powder exhaust fan |
43 |
17.3 |
0.95 |
|
2 |
#2 powder exhaust fan |
35 |
19.5 |
0.98 |
|
3 |
#3 induced draft fan |
35 |
18.5 |
0.98 |
|
4 |
#4 induced draft fan |
40 |
14.5 |
0.96 |
Energy saving calculation (reference P1/P2= (n1/n)³)
1) #1powder exhaust fan，energy saving rate =30.4%
2) #2 powder exhaust fan，energy saving rate =31.35%
3) #3 induced draft fan，energy saving rate =31.35%
4) #4 induced draft fan，energy saving rate =30.76%
According to the actual calculation, the average annual energy saving rate of Hubei Shiyan thermal power plant can reach 30.965%. If the machines run 8226 hours per year, 4 MV Drive can save energy 2649068 KWH.
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