When preparing to purchase the air compressor, first determine the working pressure required by the gas end, plus the 1-2 bar margin, and then select the pressure of the air compressor. (The margin is considered from the air compressor installation location. The pressure loss to the actual end of the pipeline, depending on the length of the distance between 1-2 bar, consider the pressure margin). Of course, the size of the pipe diameter and the number of turning points are also factors affecting the pressure loss. The larger the pipe diameter and the smaller the turning point, the smaller the pressure loss; otherwise, the pressure loss is greater.
Therefore, when the distance between the air compressor and each air end line is too far, the diameter of the main line should be properly enlarged. If the environmental conditions meet the installation requirements of the air compressor and the working conditions permit, it can be installed near the air end.
Volume flow selection:
1. When selecting the volume flow of the air compressor, first understand the volume flow of all the gas equipment, and multiply the total flow volume by 1.2 (ie, enlarge the 20% margin);
2. The new project can be selected according to the flow value provided by the design institute;
3. To select the volume flow parameters of the gas equipment from the gas equipment supplier for selection;
4. The modification of the air compressor station can be selected according to the original parameter value combined with the actual gas usage;
Appropriate selection is beneficial to both the user and the air compressor equipment. The selection is too large and wasteful. If the selection is too small, the air compressor may be in a loaded state for a long time or the air is not enough or the pressure cannot be used.
The relationship between power and working pressure and volume flow
In the case of constant power, when the speed changes, the volume flow and working pressure also change accordingly; for example: a 22KW air compressor, the working pressure is determined to be 7bar at the time of manufacture, according to the compressor main engine technical curve The speed and displacement are 3.8 m3/min; when the working pressure is determined to be 8 bar, the speed must be reduced (otherwise the drive motor will be overloaded). At this time, the displacement is 3.6 m3/min; because the speed is reduced, the row is reduced. The gas is also reduced accordingly, and so on.
The power selection is to meet the working pressure and volume flow conditions, and the power supply capacity can meet the power consumption of the matched drive motor.
Therefore, the steps of selecting an air compressor are: first determine the working pressure, then determine the corresponding volume flow, and finally the power supply capacity.
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