From the structure, there are oil-free screw air compressor, oil-free piston air compressor and pressurized air compressor; The purchase mainly depends on three standards: economy, reliability and safety. The economy is the cost performance ratio. Generally, the cost performance of imported machines is relatively low due to their high price, expensive parts, and difficult after-sales. If the budget is limited, it is recommended that you choose the first-class domestic air compressor. Reliable and stable, timely and efficient after-sales.

1. Exhaust pressure

The higher the discharge pressure of the compressor, the more energy is consumed. The sum of operating pressure, pipeline resistance loss and pressure drop of supporting equipment is set as the lower limit of rated exhaust pressure of screw air compressor or piston air compressor. Generally, the diameter of gas transmission pipeline should be larger to reduce resistance loss and achieve the purpose of reducing energy consumption during long-term operation.

2. Exhaust volume

The actual total gas consumption is calculated as the X 1.1-1.2 coefficient, which is used as the model for selecting the exhaust volume. If the selection is too low, the specified value of the gas equipment cannot be reached. If the selection is too large, the energy consumption will be large and the operation will be uneconomical. At the same time, the purchase cost of large displacement screw or piston air compressor is higher.

The quality of compressed air shall be based on the requirements of industrial gas equipment for compressor gas, and the air compressor and supporting equipment shall be appropriately purchased. The following points need to be considered:

To reduce the oil content in the compressed gas, an oil removal purifier can be used. If the treatment index is high, multi-stage treatment can be used. To reduce the water content in the compressed gas, auxiliary water removal equipment can be used.