Application of Sepp inverter in constant pressure

2022-06-16
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Application of CEP inverter in constant pressure air supply system

application of CEP inverter in constant pressure air supply system

I. advantages of variable frequency automatic control system for constant pressure air supply, Thus, the air compressor can save energy, reduce consumption and improve gas supply quality. At the same time, the automation of the control process is realized, and the air compressor is provided with automatic alarm protection for overpressure, overload, overcurrent, undervoltage, etc.

II. Working principle

generally, the air compressor station is composed of multiple air compressors, and each air compressor is driven by a motor for independent control. In actual work, the air compressor station is designed according to the maximum working load. Therefore, when the gas consumption is small, start one or two units. When the gas consumption is large, start multiple units in parallel. When the pipe pressure value is preset in the system, the system will automatically load and unload according to the lower and upper limits of the preset pressure value to meet the gas consumption. This control mode of air compressor station brings many problems. The existing air compressor station control usually uses the following three methods to adjust the exhaust volume:

first: vent the excess compressed air

II: turn off the motor

III: close the suction valve to make the motor idle

the above air supply methods make it impossible to realize continuous regulation of air supply volume. When the air consumption is constantly changing, the air supply pressure will inevitably fluctuate greatly. Frequent start and stop will easily cause damage to the equipment by pressing the reset key, which will have a considerable impact on the electricity and air compressor

III. Effect Analysis of the original pressure control method: ⑴ venting the compressed air will cause a great waste of energy, and the compressed air will be put into the atmosphere. Δ W=P ×Δ Q ( Δ Q discharged air flow) ⑵ stop the motor to regulate the pressure, which is only used in the air compressor with small capacity. The frequent start and stop of the motor consumes a lot of energy and shortens the service life of the air compressor. (3) close the suction valve to regulate the pressure. Most air compressors close the suction valve to make the motor idle to regulate the pressure, but the air compressor still drives the compressor during idle operation. At this time, the energy consumption accounts for about 30%~50% of the full load operation of the air compressor. The energy consumed by the motor during starting the air compressor is a load with large moment of inertia. The power required by the motor during no-load starting is approximately 2~3 times that consumed during full load operation, and the time is about 5~60s. When the exhaust volume is controlled during frequent starting, the electric shock is large and the energy consumption is obvious. After using the frequency converter, the harmful volatiles can be generated to realize smooth soft start and soft stop, reduce the electric shock and prolong the service life of the equipment. Variable frequency constant pressure control mode the roasting furnace innovatively adopts the on load oven drying mode to automatically adjust the difference between the gas transmission and the set value through the PID to keep the pressure constant. The system pressure converts the pipe pressure into an electrical signal through the pressure

transmitter and transmits it to the PID unit for comparison with the set value, and calculates according to the difference according to the established control mode, so that the frequency converter outputs the corresponding speed to control the motor of the compressor, Make the actual pressure equal to the set pressure to achieve the purpose of constant pressure, realize the continuous regulation of gas supply and ensure the stability of pipe pressure

IV. applicable air compressor type,

1 piston air compressor

2 screw air compressor

3 centrifugal air compressor

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