From What Aspects We Can Achieve More Energy Saving of Air Compressor

In order to ensure that the air compressor will not start and stop repeatedly, there is generally a shutdown delay of about 5 minutes, that is no-load. During no-load period, the air compressor air end does not pump air, and the motor is in no-load idling state, but the motor will also consume electricity when idling, and its power consumption is about 25% of that under load (the performance of air compressors of different types, brands and powers is different, and this data is only for illustration).

The energy waste caused by compressed air leakage ranks first among various waste factors, accounting for 20% to 50%. For example, when the air supply pressure is 0.7MPa, a 1mm diameter leakage hole in the air pipe causes a loss of about 3525 kwh per year.
In addition to the energy waste caused by the direct leakage of compressed air, the leakage will also cause the pressure drop of the whole compressed air system. If you want to ensure the pressure, you need to increase the discharge pressure of the air compressor or start other air compressor to further increase the energy consumption cost.

Due to the uncertainty of pipeline pressure loss and the peak flow in equipment startup, the air supply pressure of the air compressor is often 0.2MPa ~ 0.3MPa higher than the required pressure at the air end, and the power consumption of the air compressor increases by 4% ~ 8% every time the end equipment increases by 0.1MPa. Sometimes, the pressure of the whole air supply pipe network system will be increased for a few equipment with high pressure requirements, resulting in serious energy waste. Therefore, on the basis of ensuring the demand for gas, we should reduce the supply pressure as much as possible and compress the range between the minimum and maximum pressure as much as possible.

A lot of energy is consumed in the process of compressed air production. When the air compressor is running, the electric energy really used to increase the air potential energy accounts for only a small part of the total power consumption of the air compressor, about 15%, and about 85% of the electric energy is converted into heat and discharged into the air through air cooling or water cooling. 70-94% of the lost heat can be recycled, equivalent to about 60-80% of the shaft power of the compressor. Recovering heat from compressed air can reduce the demand for purchased energy, such as coal, electricity, natural gas, heating, hot water, etc., so as to reduce operating costs and carbon dioxide emissions.

Compared with the fix speed air compressor, the appearance of frequency conversion air compressor is not for full speed continuous operation. What it does is not only load and unload, but also accurately match the compressed air output with the demand. Therefore, PM variable frequency air compressor is an ideal choice for enterprises with fluctuating demand, so as to achieve more energy-saving effect.