On the frequency converter in the application of Energy Saving Air Compressor - inverter - Education

On the frequency converter in the application of Energy Saving Air Compressor - inverter - Education

Article by jekky

1, air compressor in industrial production has been widely used.There are many types of air compressor, a piston-type air compressor, screw compressor, centrifugal compressor, but almost all of its gas supply control method with loading and unloading control method. Although the principle of the gas supply control method was simple, but there are high energy consumption, the intake valve fragile, unstable air pressure and many other issues. With the social development and progress, efficiency and low consumption Technology Has become more and more attention. Air compressor gas field in the application of variable frequency speed control technology can save energy while improving compressor performance, improve quality of supply has become a topic of concern to us.

2, air compressor air compressor works on both the current use of two-type control (upper and lower limits of control) or start-stop-type control (small air compressor), that is, when the compressed gas cylinder pressure reaches the set value ceiling, air compressor or hydraulic pressure through its intake valve closure, small air compressor is shut down.

When the pressure drops to a lower limit set value, the intake valve open air compressor, small air compressor is then started. The traditional power control mode is easy on the impact of air compressor itself has some damage, when gas consumption frequent fluctuations, in particular.

Normal operating conditions, air is compressed to the gas tank. Air compressor test points (including air temperature, pressure and Luo pole temperature, cooling water pressure, temperature, and hydraulic, oil temperature etc.) and overall control by the main control SBC control.

When the compressor outlet pressure reaches the set value of upper limit, hydraulic splitter through the inlet valve is closed, and open the internal circulation pipe for self-loop operation. At this point continue to use gas with gas units.

When the pressure drops to a lower limit set value, hydraulic splitter valve closed loop line, open the air inlet, air is compressed by the filter to the tank. In the static way of the original start (Y- ), and the loading, unloading to grid power supply equipment and Luo bar will have a major impact. Especially Energy Serious waste.

Down the main motor speed, shaft power will drop a lot. Considerable energy saving potential. ) Frequency energy saving effect is very significant, especially adjustment range of systems and equipment, through practical application can directly see the changes in the flow as long as the speed (frequency) will make minor changes in a greater degree of shaft power changes, the result of this character makes the frequency control (energy) approach as a trend and the deepening of the adjustment used in various industries and various areas.

3, loading and unloading problems in gas supply control method3.1 energy analysis we know, contains control mode allows the pressure of compressed gas back and forth between the Pmin ~ Pmax changes. Pmin is the lowest pressure that can guarantee customers a minimum pressure of work. Under normal circumstances, Pmin, Pmax relationship can be expressed in the following formula: CPmax = (1 + ) Pmin is a percentage, its value roughly 10% to 25%. The use of a Frequency Converter with Continuously Variable gas volume, then we will always maintain the pressure pipeline network to meet the gas supply pressure, ie, Pmin in the vicinity. It can be seen in the loading and unloading gas compressor control method than under the control of the compressor inverter system, the waste of energy mainly in two parts:

(1) compressed air pressure exceeds the energy consumption Pmin to Pmin pressure, the original control mode to determine its pressure will continue to rise (until Pmax). This process is also an energy-consuming process.

(2) unloading the unreasonable regulation of energy normally consumed, when the pressure reaches Pmax, the air compressor through the following methods to uninstall the buck: close the intake valve in the motor idling state, while separation excess compressed air tank valve by shorting shorting. This adjustment method to cause great waste of energy.

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