How to save energy in Shandong Dongying inverter air compressor

Speaking of variable frequency air compressor, we generally think of energy saving, and in the world of variable frequency air compressor, the most energy saving is the permanent magnet variable frequency air compressor.

Shanghai granklin group is a modern enterprise specializing in the design and manufacture of air compressors. it is mainly engaged in Shanghai air compressor, variable frequency screw air compressor, permanent magnet variable frequency air compressor, screw compressor, Shanghai screw air compressor, Shanghai air compressor, oil free air compressor.

1. the current problems of air compressor

at present, most air compressors use two-point control (upper and lower limit control), that is, when the pressure in the compressed gas cylinder reaches the set upper limit, the air compressor closes the intake valve through its own air pressure or oil pressure. When the pressure drops to the lower limit of the set value, the air compressor opens the intake valve. The main problems of this control method:

it is easy to cause impact on the power grid, and it also has certain damage to the air compressor itself, especially when the gas consumption fluctuates frequently.

2. Direct start control mode (Y/& Delta;) and loading and unloading will not only cause great impact on power supply and distribution equipment and screw, but also cause serious waste of electric energy.

3. The original control system adjusts the intake valve mechanically, so that the air supply cannot be continuously adjusted. When the air consumption is constantly changing, the air supply pressure will inevitably produce large fluctuations. Coupled with frequent adjustment of the intake valve and exhaust valve, it will accelerate the wear of the intake valve and exhaust valve, increase the amount of maintenance and maintenance costs.

The working principle of energy saving of 2. air compressor system

it is a more scientific energy-saving control method to control the speed of air compressor by frequency converter to achieve energy saving. According to the similarity theorem, it is concluded that Q1/Q2 = n1/n2

H1/H2 =(n1/n2)2

P1/P2 =(n1/n2)3

where: Q is air supply flow rate of air compressor; H is pipe network pressure; P is motor power consumption; N is air compressor speed. It can be seen that if the motor speed drops to 70% of the rated speed, the air compressor supply pipe network flow rate is reduced to 70%, the pipe network pressure is reduced to (70%) square, the motor power consumption is reduced to 70% cubic, I .e. the energy saving is 34.3, excluding the motor mechanical loss, motor copper loss, iron loss, etc., the energy saving efficiency is about 30%. The variable frequency air compressor can accurately change the speed of the main motor of the air compressor according to the change of the air volume under the constant exhaust pressure; the air compressor only outputs the required air volume, and at the same time only consumes the necessary energy for the output of these air compressors, thus achieving the purpose of energy saving. The frequency conversion speed regulation system takes the output pressure as the control object. The system adopts Komron speed sensorless vector frequency converter and remote pressure transmitter SP to form a closed-loop constant pressure control system. The required pressure value can be directly operated by the frequency converter panel. The on-site pressure is detected by the transmitter and fed back to the frequency converter. The frequency converter adjusts its output frequency through built-in PID comparison and calculation to meet the requirement of constant pressure gas supply by the air compressor.

Frequency Conversion Operation of 3. Air Compressor

the inverter starts the compressor from a low frequency, and the start acceleration time can be adjusted, thereby reducing the impact on the electrical and mechanical components of the compressor during startup, enhancing the reliability of the system, and extending the service life of the compressor. In addition, the frequency conversion control can reduce the current fluctuation when the unit starts, which will affect the power consumption of the power grid and other equipment, and the frequency converter can effectively reduce the peak value of the starting current to a minimum. According to statistics, its power saving rate can reach 25% ~ 35%. In addition, the frequency converter also has a series of protection functions, such as overload, overcurrent, overvoltage, phase loss and other protection functions.

4. transformation effect

1, the whole set of transformation device does not change the original air compressor control principle, that is to say, the original air compressor system protection device is still effective, thus greatly improving the safety and reliability of the system.

2. After the installation of the air compressor renovation project, the operation is stable, and the vibration and noise of the air compressor are greatly reduced.

3. After the frequency conversion transformation, the startup is a soft start, and there is no unloading and loading impact current during operation, and the mechanical impact of the air compressor itself is greatly reduced.

4. Under the condition of ensuring the gas supply of the pipe network, the current is greatly reduced, and there is basically no full load phenomenon, generally around 40Hz. Compared with the past, the power saving rate is above 30%.

5, air compressor, power supply and distribution equipment and mechanical equipment due to stable gas supply, maintenance is greatly reduced, the overall benefit is obvious.

6. After the transformation, the operation of the air compressor is safe and reliable, and the process requirements of gas consumption are met at the same time.