Application du variateur de fréquence Harsvert dans ventilateur brasseur d'air
Application du variateur de fréquence Harsvert dans ventilateur brasseur d'air
2009-12-15 13:52:29
I. Introduction
Tongli Cement Co., Ltd a été fondé en 1995 et est doté de deux lignes de production, avec une productivité journalière de 2500t et une productivité annuelle de 2 000 000t. En 2006, Tongli cement plant s’est procuré un Harsvert-A06/150 pour ajuster la vitesse. L’entraînement à fonctionné stablement depuis qu’il a pris en charge les opérations (janvier 2007) et l’économie en énergie est considérable.
II. Energy-saving effect
Circulating fan is driven by wire-wound motor. Its rated power is 6kV/1250kW. Before using VFD, air flow was adjusted by valve and there is much power loss on valve. Meanwhile, because valve was adjusted frequently, reliability of valve was not good, which affected system stability. After using VFD ( short connecting rotor winding), motor speed is adjusted by VFD. There is no need to adjust valve frequently and valve opens at a large scope.
Data in the site:
item | Before modification | After modification |
Total material volume (t/h) | 220 | 200 |
Given speed of VFD (r/min) | 1000 | 820 |
Grinding head pressure(Pa) | 13 | 160 |
Grinding tail pressure(Pa) | 1000 | 1100 |
Motor current A | 55 | 35 |
Noise | 67 | 67 |
Outlet pressure(Pa) | 2300 | 1800 |
Outlet temperature (℃) | 78 | 52 |
III. Characters of Harsvert VFD
Model | Harsvert-A06/150 |
Rated capacity | 1565KVA |
Rated current | 150A |
Rated voltage | 6kV |
Output frequency | 0~50Hz |
Motor power | 1250kW |
Acceleration/deceleration time | 0~3200s |
Over load capacity | 120% for 60s, 150% for 3s, 200% immediately |
Protection | Over voltage, low voltage, over current, over heat, earth, lack phase and so on. |
IV Advantages
When motor starts, current increases from zero and will be not over rated current. So VFD avoids big current impact when motor starts, decreases maintaince, improves system safety.
V. Conclusion
Adjusting speed by VFD is not only easy and convenient but also saves much energy. It improves system safety and manufacture process.
