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Analysis on the existing problems of air compressor loading and unloading control

time:2017-09-14 13:12:35source:Ziqi compressorauthor: 胡译鑫Clicks: 0
There are some problems in the way of air compressor's loading and unloading control. 1. The way of energy consumption analysis, we know that the pressure change between Canada and the control compressed gas is PMIN ~ Pmax. Pmin is the minimum pressure v

空压机加卸载供气控制方式存在的问题分析

  Problems in the control mode of air compressor adding and unloading

  1, the way of energy consumption analysis

  We know that the pressure in Canada controls the pressure of compressed gas to change back and forth between PMIN and Pmax. Pmin is the minimum pressure value, that is, the minimum pressure to ensure the normal work of the user. The relation of Pmin and Pmax can be expressed as follows: cpMax will be = (1+ delta), Pmin is a percentage, and its value is basically 10% to 25%. The VVVF technology can adjust the volume of the gas continuously, and you can always keep the pressure in the pipe to meet the pressure of the Pmin. Therefore, the air compressor in the way of loading and unloading gas control is made up of the air compressor waste under the control of the inverter system in two parts:

  (1) the energy of compressed air is Pmin higher than that of Pmin, and the original control determines that the pressure will continue to rise until maximum power is reached. This same process is a process of energy consumption.

  (2) the power consumption is not reasonable unloading adjustment method is usually the case when the pressure reaches Pmax, the air compressor through the following method to buck uninstall: close the inlet valve, the motor in the idle state, and the separating tank of compressed air through the vent valve in excess. The way to adjust is to cause a lot of energy to be wasted.

  2, other inadequacies

  (1) by adjusting the intake valve, the volume of gas can not be adjusted continuously. The consumption of natural gas is constantly changing. The pressure of supply will inevitably fluctuate considerably. The accuracy of the arrival of the process gas. In addition to the frequently adjusted intake valve, the intake valve will accelerate the wear and increase the cost of maintenance and maintenance.

  (2) frequent opening and closing the vent valve, the durability of the relief valve can not be guaranteed. Four, the energy saving inverter of the air compressor system controls the speed of the air compressor and realizes the principle of the energy saving control method. It is more scientific. According to the operating characteristics of the air compressor to know: Q1/ = n1/ N2 H1/ Q2 H2= (N1 / N2) 2 P1/ P2= (N1 / N2) of the Q--- type air compressor, air supply pipe network; power H - P - pipe pressure motor speed N - air consumption; compressor. From the above equation, when the motor speed is reduced to 80% of the rated speed, the air supply volume of the air compressor supply pipe network is reduced to 80%, the pressure drop of the pipe network (80%) is 2, and the power consumption of the motor is reduced (80%).

  3, or 51.2%, to remove the mechanical loss of the motor and the motor copper, iron loss, and nearly 40% energy efficiency, which is the effect of the principle of speed regulation. The control plan of constant pressure gas supply is aimed at many problems of the original supply control mode, through the above analysis, the application of constant pressure supply gas frequency conversion technology. Collect by sending to the actual pressure P pressure transmitter, intelligent PID control, and the set pressure value of P0, and operating in accordance with the PID control mode in the size of the difference, generating a control signal is sent to the VVVF control inverter through frequency and speed of the inverter motor, so that the actual pressure P is always close to the set pressure P0. The system adopts closed loop pressure gauge, a pressure sensor installed the original pressure gas tank, pressure signal of 4-20mA is converted into electrical signals sent to the inverter internal PID regulator, signal pressure regulator setting value comparison operation, and outputs a control signal according to the output signal of the frequency inverter the motor speed adjustment, change the supply pressure, keep the pressure constant, so that the air compressor operation in a power saving state always. The same time, the program can increase the frequency and frequency switching function, and retain the control and protection system, the use of the program, from a fixed rotary air compressor motor, the inverter start to achieve a soft start, to avoid the inrush current and the air compressor and mechanical shock.

  Analysis on control mode of air compressor adding and unloading gas supply

  1. energy consumption analysis

  In general, the loading and unloading control mode makes the pressure of the compressed gas change between Pmin and Pmax. Pmin is the minimum pressure to ensure the normal work of the user, and also called the minimum pressure value. The conversion relationship between Pmax, Pmin such as the formula: Pmax = (1 + 8) Pmin (1), which is a parameter in the 10% ~ 25% percentage. When we use frequency conversion technology to achieve continuous adjustment of gas supply, the pipe network pressure will remain near the minimum pressure value of Pmin.

  Through this information, we can know that the air compressor under the control mode of loading and unloading and air supply is much more energy wasting than that of the air compressor controlled by frequency conversion system in 2 parts.

  (1) in the process of compressed air, the pressure of compressed air exceeds the minimum pressure value, that is, the energy consumed by Pmin. After the compressed air pressure reaches Pmin, the original control mode causes the pressure to continue to rise to Pmax. So this process will release a lot of energy to the outside world, causing a lot of loss of energy.

  When the gas above the Pmin is entered into the pneumatic element, the pressure is reduced to the position of close to Pmin after the pressure relief valve is decompressed. This process also consumes energy.

  (2) in the process of unloading, the energy consumed by the incorrect pressure regulation mode

  Generally speaking, when the pressure reaches the maximum pressure value of Pmax, the air compressor mainly uses the following method to depressurization and unloading: closing the intake valve to make the motor in a state of idle, and emptying the excess compressed air in the separating tank. This method leads to a large number of


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