Classification of Pressure Ranges for Conventional Industrial Compressors
The discharge pressure range of industrial compressors is quite broad and not a fixed value. In the industrial sector, compressors are typically classified into the following standard categories based on their discharge pressure:
- Low-pressure compressor:Exhaust pressure is typically in the range of 0.2 MPa To 1.0 MPa It is widely used in general pneumatic conveying, textile machinery, and routine blow-off operations.
- Medium-pressure compressor:Exhaust pressure is at 1.0 MPa To 10.0 MPa It is commonly used in chemical process gas compression, mine pneumatic equipment, and certain high-pressure cleaning applications.
- High-Pressure and Ultra-High-Pressure Compressors:Exhaust pressure is greater than 10.0 MPa Even reaching 100 MPa The above applications are primarily employed in extreme operating conditions such as the filling of specialty gases, petrochemical synthesis, and cryogenic separation.
Actual pressure requirements in typical application scenarios
In actual production, most conventional factories are concerned withAir compressor pressureThe demand is concentrated in the low-pressure range. Understanding the actual requirements of terminal equipment is essential for determining…Compressor operating pressureThe premise.
- Conventional pneumatic tools and cylinders:The rated working pressure of most standard pneumatic tools, cylinders, and valves is 0.6 MPa To 0.8 MPa (i.e., the commonly referred to pressure of 6 to 8 kilograms).
- Material Conveying and Mixing:The pressure required for pneumatic conveying of powders or liquid mixing is relatively low, typically in the range of 0.3 MPa To 0.5 MPa This will suffice.
- Special Process Requirements:Processes such as PET bottle blow molding and compressed auxiliary gases for laser cutting often require 1.6 MPa To 3.0 MPa Even higher-pressure gases.
Compressor Sizing Principles Based on Pressure Parameters
In progressCompressor SelectionAt that time, the determination of pressure parameters is directly related to the system’s stability and operating costs. When selecting equipment, the following principles should be followed:
- Clarify the peak demand at the terminal end:Determine the highest working pressure requirement among all gas‑powered equipment and use this value as the reference pressure.
- Reserved pressure drop margin in the pipeline network:Gas transmission through pipelines results in pressure losses, and the pressure drops across downstream equipment such as filters and dryers must also be taken into account. Typically, it is necessary to add a margin on top of the reference pressure. 0.1 MPa To 0.2 MPa The margin.
- Avoid using high pressure for low-demand applications:Selection pressure is not always better when higher. For every increase in discharge pressure, 0.1 MPa, compressor energy consumption increases by approximately 7% Approximately. Blindly selecting a high-pressure model for low-pressure applications will result in significant energy waste.
Pressure Regulation and System Energy-Saving Recommendations
Determine a reasonable oneIndustrial compressorAfter pressurization, in actual operation it is also essential to focus on pressure control and energy conservation. For operating conditions with significant fluctuations in air demand, variable‑frequency drive technology is recommended to maintain the compressor discharge pressure within a set range, thereby reducing unloading‑idle time. Furthermore, if the plant has multiple pressure requirements, a high‑low‑pressure segregated supply system should be considered to avoid raising the overall system supply pressure simply to meet the needs of a few high‑pressure devices, thus optimizing the energy efficiency of the entire compressed‑air system.