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Cases of internal feedback chopped wave speed regulating applied in projects:
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The high-voltage internal feedback chopped wave speed regulating system has been widely and well applied in the national-wide key projects. Customers have made a substantial comparison of internal feedback speed regulating products and other speed regulating products, especially on the safety, reliability, stability, energy-saving efficiency and cost performance of the internal feedback speed regulating, which is well received and highly praised by our customers. The following cases showing the internal feedback chopped wave speed regulating system of our company applied in the projects are provided just for your references. For other cases, please refer to the achievement list of our company.
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Case I: Zhejiang Hongshi Cement Co., Ltd. (practical case of fan)
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Model of motor: YRKK630-10-710
Power of motor: 710KW
Rated voltage of motor: 10KV
Rated revolutions of motor: 595r/min
Scope of speed regulating: 260-595r/min
Motor in full-speed operation: 60% opening of valve, the actual motor power is 575.1KW
Motor in speed regulating operation: 100% opening of valve, the actual motor power is 356.56KW |
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Case II: Zhejiang Hongshi Cement Co., Ltd. (practical case of primary fan)
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Power of motor: 1,120KW
Rated voltage of motor: 6KV
Rated revolutions of motor: 1,487r/min
Rated efficiency of motor: 94.6%
Rated power factor of motor: 0.89 |
Comparison of primary fan of No. 1 and No. 2 furnaces in operation with the same load in Nanlin Self-sufficient Power Plant
| Date |
Time |
Primary fan of No. 1 furnace |
Primary fan of No. 2 furnace (speed regulating) |
Reading on electric meter |
Accumulation of consumption MWh |
Reading on electric meter |
Accumulation of consumption MWh |
Oct. 5 |
17:00 |
4024.30 |
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3775.67 |
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Oct. 5 |
20:00 |
4026.22 |
1.92 |
3776.79 |
1.12 |
Oct. 6 |
6:00 |
4032.71 |
8.41 |
3780.42 |
4.75 |
Oct. 6 |
17:30 |
4040.03 |
17.02 |
3784.47 |
8.8 |
Oct. 7 |
9:00 |
4049.92 |
25.62 |
3790.24 |
14.57 |
Oct. 7 |
15:30 |
4054.31 |
30.01 |
3792.71 |
17.04 |
Oct. 8 |
8:30 |
4065.48 |
41.18 |
3799.12 |
23.45 |
Oct. 8 |
16:00 |
4070.19 |
45.89 |
3801.83 |
26.16 |
Oct. 9 |
16:00 |
4085.60 |
61.3 |
3810.81 |
35.14 |
Time in total: 94 hours |
Average power |
0.65213MW |
Average power |
0.37383MW |
Average electricity saving |
△P = 652.13-373.83 = 278.3KW |
Average electricity saving rate |
ζ= ( 0.65213-0.37383)/0.65213 = 42.67% |
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Case III: Guizhou Zunyi Alkali Works Self-sufficient Power Plant (practical case of fan used in fluidized bed)
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Model of motor: YRKKCT630-4-1250
Power of motor: 1,250KW
Rated voltage of motor: 10KV
Rated revolutions of motor: 1,484r/min
Scope of speed regulating: 720-1,484r/min
Power factor of motor: 0.89
Efficiency of speed regulating: ≥0.95
Current harmonic: ≤4%
Motor in full-speed operation: the actual motor power is 1,019.75KW
Motor in speed regulating operation: the actual motor power is 632.24KW on average
The above metrical data is measured when the machine set is in generating state with full load. The average electricity saving rate of 70 hours is 38%. The generation and motor power at trough is not measured. If the machine set is in generating state at trough, the energy-saving efficiency will be higher.
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Case IV: Power Plant of Panzhihua Iron &Steel Co., Ltd. (practical case of suction fan)
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Model of motor: YRKKNT560-8-710
Power of motor: 710KW
Rated voltage of motor: 6KV
Rated revolutions of motor: 742r/min
Scope of speed regulating: 2,500-742r/min
Rated efficiency of motor: 95%
Power factor of motor: 0.87
Grade of protection of motor: IP44
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| 1# Suction Fan |
| Date |
Time |
Duty ratio |
Rotating
speed |
Rotor
voltage
ac |
Rotor current
ac |
Feedback
voltage
dc |
Feedback current
ac |
Chopped wave
IGBT
temperature |
Temperature of rectification |
Inverting
IGBT
temperature |
Temperature of reactor |
Opening of air door |
| 11.1 |
10:00 |
13 |
341 |
450 |
95 |
701 |
79 |
25 |
26 |
26 |
40 |
99% |
| 11.2 |
8:00 |
25 |
410 |
371 |
145 |
729 |
110 |
39 |
38 |
36 |
70 |
77% |
| 11.2 |
12:00 |
40 |
443 |
336 |
191 |
734 |
112 |
40 |
40 |
36 |
67 |
56% |
| 11.3 |
13:00 |
14 |
460 |
460 |
110 |
728 |
91 |
33 |
33 |
32 |
42 |
48% |
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| 2# Suction Fan |
| Date |
Time |
Duty ratio |
Rotating
speed |
Rotor
voltage
ac |
Rotor current
ac |
Feedback
voltage
dc |
Feedback current
ac |
Chopped wave
IGBT
temperature |
Temperature of rectification |
Inverting
IGBT
temperature |
Temperature of reactor |
Opening of air door |
| 11.2 |
8:00 |
25 |
402 |
382 |
174 |
708 |
110 |
34 |
36 |
33 |
69 |
81% |
| 11.2 |
14:00 |
35 |
421 |
360 |
178 |
725 |
106 |
43 |
41 |
36 |
60 |
70% |
| 11.3 |
15:00 |
13 |
318 |
426 |
102 |
729 |
80 |
37 |
33 |
33 |
41 |
99% |
| 11.4 |
12:00 |
53 |
514 |
256 |
222 |
718 |
96 |
46 |
43 |
39 |
74 |
41% |
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| Effect of Electricity Saving (gross generation: 100,000 KW) |
| Input power of motor |
1# Suction Fan |
2# Suction Fan |
Total |
| Full-speed operation |
435KW |
510KW |
945KW |
| Speed regulating operation K=13 |
208KW |
198KW |
406KW |
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| Average electricity saving rate ζ=(945-406)÷945=57% |
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Case V:Shanxi Linfen Hexi Thermal Supply Power Plant Co., Ltd. (practical case of circulating pump)
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Model of motor: YRKKNT500-4-630
Power of motor: 630KW
Rated voltage of motor: 6KV
Rated revolutions of motor: 1,487r/min
Scope of speed regulating: 590-1,487r/min
Power factor of motor: 0.89
Efficiency of speed regulating: 96%
Current harmonic: ≤4%
Motor in full-speed operation: 36% opening of valve, the actual motor power is P=497.7KW
Motor in speed regulating operation: 100% opening of valve, the actual motor power is P=288.66KW
Average electricity-saving rate: 42%
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