Selection and Application of High Voltage Variable Frequency Speed ​​Control System for Large Fans

Technical performance

(1) After using the inverter control, it can achieve smooth start without impact (soft start), and the starting current is small, avoiding the mechanical damage caused by the starting shock and the heating of the appliance caused by the large starting current and long time.

(2) The air volume control is controlled by the motor speed to realize the air volume adjustment under different working conditions, and it is easy to realize the computer closed-loop automatic adjustment control, which avoids the motor and the smoke exhaust machine working at the rated speed when the air volume is small. The device operates at a lower current and lower speed, which increases the service life of the device, reduces the failure rate, and improves system efficiency.

(3) The fan is a typical quadratic load. The load power (p) is proportional to the cube of the speed (n): p=kp×n3, as long as the motor speed (n) drops a little, the load power (p) It drops a lot, the power saving effect is very obvious, the smoke exhaust machine often works at a frequency of 40 ~ 47hz, and the power saving is about 17% compared with the previous one.

(4) The direct economic loss caused by the fault shutdown before the transformation is as high as 24,000 yuan/h per kiln. Since the inverter control was changed, the electrical and mechanical faults have been significantly reduced. Comprehensive comparison before and after technical transformation

The comprehensive pairs before and after the technical transformation are shown in Tables 3 and 4.

Application of high voltage variable frequency speed control system for wind turbine

Before the transformation, the exhaust fan of the firing kiln usually has a opening degree of 50-80%, and the throttling loss of the fan is very large. After the frequency conversion transformation, the preliminary statistics show that the power saving rate reaches 17%. After the frequency conversion transformation, the fan starts smoothly and runs. The medium vibration is reduced, and the bearing temperature is lowered, which plays a role in reducing the dust accumulation of the fan impeller, prolonging the cleaning cycle, and improving the operating life of the equipment.

After the successful transformation of the large wind turbine, it began to be put into industrial use, the operation was in good condition, and the various technologies also met the expected requirements. In this transformation, it showed a relatively good effect of reducing consumption, and then provided a number of protective measures to extend The service life of the equipment. The above is a detailed analysis of the small series for everyone.