What is the energy-saving effect of frequency converter in the application of fan and water pump?

Frequency converters are now widely used in petroleum, chemical, light industry, paper, rubber, electric power, metallurgy and many other industries. The energy-saving effect of variable frequency speed regulation technology improves the technological level and saves resources for enterprise production. It plays an important role in energy conservation and environmental protection, and is also an important role for enterprises to transform and update products. The application of frequency converter in fan and water pump is as follows:

The pump load is a typical square torque load. Generally, the type of pump load is selected according to the amount required for full load operation. In practical applications, most of the time is not full load. Therefore, as long as the average speed decreases slightly, the load power will decrease rapidly, thus achieving the effect of energy saving.

However, when the motor is started directly, due to the inability to adjust the speed, the wind deflector and valve are often used to adjust the air volume or flow, which not only causes energy waste, but also causes power grid impact, equipment vibration and water hammer due to excessive starting current.

When frequency conversion technology is used, the speed can be easily controlled according to the actual process requirements. For example, when the motor speed is 80% of the rated speed, the load power is the third power (80%) of the rated power, that is, about 50%. This speed is reduced by 20% and energy saving is more than 40%. At the same time, the closed-loop constant pressure control can also be realized conveniently, and the energy-saving efficiency will be further improved. After adopting the frequency converter of fan and water pump, it not only avoids the impact on the power grid during startup, but also reduces the equipment failure rate, eliminates vibration and water hammer, extends the service life of the equipment, and reduces the capacity requirements and reactive power loss of the power grid.