one. Some aspects of energy waste of ordinary air compressors
1. There are mainly two kinds of working conditions of ordinary air compressors, one is the loading state and the other is the no-load state. In the loading state, the air compressor intake valve is opened, free air is sucked in, compressed air is output, and the production needs are satisfied; in an unloaded state, the air compressor intake valve is closed, and the compressed air is stopped, and the air compressor is idle. . The motor overcomes the mechanical resistance during idling and consumes about 30% of the rated power.
2, the general air compressor pressure control is the upper and lower limit control, first according to the minimum pressure requirements of the production equipment, set the lower limit of the air compressor output pressure, which is the pressure of the air compressor to start loading; then add 1 in the minimum pressure Pa around, as the upper limit of the compressor output pressure, that is, the pressure to start unloading. The output pressure of the compressor will fluctuate between the upper and lower limits. The power consumption of the air compressor is proportional to the output pressure. The higher the output pressure is, the greater the power consumption is. The pressure difference of 1 Pa from the lower limit of the output pressure to the upper limit will consume 7-10% of the total power.
3. In the air compressor system, if there are multiple air compressors operating at the same time, the output pressure of each air compressor will fluctuate between the upper and lower limits as the pressure of the pipe network fluctuates, so each machine has more Consumption of 7-10% of rated power.
4. Different air compressor operating parameters will also cause different air compressor power consumption, must be set according to air conditions in order to achieve the most economical operating results.
two. Switch to energy-saving principle of frequency converter
Such as frequency conversion air compressor work flow chart shows: pressure air supply control by the gas tank pressure transmitter acquisition signal 4-20mA, anti-left to the inverter, the inverter after PID operation to control the inverter output frequency, and thus control The speed of air compressors stabilizes the pressure and achieves constant pressure air supply. Features are as follows:
1. The air compressor is a constant torque load, that is, the torque is the same at different speeds, but the required power is also proportional to the speed, so when the speed is reduced, the required power is also reduced, so as to achieve the purpose of energy saving .
2. The pressure setting of the variable frequency air compressor can be one point, that is, the minimum pressure that meets the requirements of the production equipment can be used as the set pressure. The variable frequency air compressor will adjust the speed of the air compressor according to the fluctuation of the pipe network pressure. Even eliminating the unloading operation of the air compressor saves energy.
3. Because the variable frequency air compressor makes the down pressure on the pipe network stable, the pressure fluctuations can be reduced or even eliminated, so that all the air compressors in the system are operated under a lower pressure that meets the production requirements, reducing the pressure upwards. Power loss caused by fluctuations.
Third, the benefits of the transformation
1. Can save a lot of energy;
2. The operating noise is greatly reduced;
3. The supply pressure is stable and the pressure control accuracy is improved;
4. The number of loading and unloading of the air compressor is greatly reduced, which reduces the wear of the operating parts of the intake valve;
5. Under the premise of guaranteeing lubrication, it is also beneficial to the mechanical aspects. Since most of the rotational speed is operated at a lower speed than the original design, the wear of each rotating part is greatly reduced, and the service life of the air compressor is reduced. extend.