Why this choice?

Permanent magnet variable frequency air compressor is sure to be familiar to everyone. More people know that permanent magnet variable frequency air compressor is energy-saving, but its energy efficiency is relatively low in the environment of high gas consumption. However, two-stage compression technology can solve this problem very well. So today we will introduce two-stage compression technology.

The exhaust volume of two-stage compressed screw air compressor is higher than that of single-stage compressed screw air compressor with the same power. At present, the application of this technology can achieve energy saving of 120,000 tce/a and carbon dioxide emission reduction of about 320,000 t/a.

I. Technical Principles

Two-stage compression is used to improve the energy efficiency of the compressor, the main reasons for which are:

Each stage reduces compression ratio, improves volumetric efficiency and reduces internal and external leakage.The oil-gas mixture can be mixed sufficiently before the primary exhaust enters the secondary suction process, thus playing the role of inter-stage cooling, making the compression process of the second stage close to the ideal isothermal compression process.

II. Technical features

1. Using high-efficiency rotor profile technology, through more than 20 finishing processes, to ensure the efficiency and reliability of two-stage compressor.

2. Using inter-stage cooling technology, spray curtain is formed by installing several jet holes in the compressed gas channel, which reduces the compression temperature and approaches isothermal compression.

3. Use special oil lubrication system and independent lubrication system for compression and bearing lubrication to ensure adequate lubrication and prolong service life of the main engine.

4. Other system structure optimization techniques, etc.

III. Workflow

Natural air enters the first stage of compression through an air filter, mixes with a small amount of lubricating oil in the compression chamber, and compresses the mixture to interstage pressure at the same time.The compressed gas enters the cooling channel and is in contact with a large amount of oil mist, thus greatly reducing the temperature.The cooled compressed gas enters the second-stage rotor for secondary compression and is compressed to the final exhaust pressure.