In general, to select a twin-screw air compressor, the following standards should be referred to: 1. Discharge pressure: the perspective of discharge pressure, air compressors with excessively high discharge pressure should not be chosen, because the higher the discharge pressure of the air compressor, the more-consuming it is. In order to achieve the purpose of reducing energy consumption during long-term operation, the diameter of the gas pipeline should generally be selected to be larger2. Discharge volume: The actual total gas consumption can be calculated and used as a standard for selecting the appropriate discharge volume. If this standard value is not to, selecting a discharge volume that is too low will not meet the specified value of the gas-consuming equipment; selecting a discharge volume that is too large will result high energy consumption during unloading. Another point to note is that the purchase cost of large-discharge-volume air compressors is relatively high, so a comprehensive consideration be made. 3. Quality of compressed air: This should be selected based on the requirements of the industry's gas-consuming equipment for the gas produced by the air, as a reference to choose the appropriate