Differences Between VSA,VPSA And PSA

PSA oxygen generator

VPSA/VSA oxygen generator

Description

Process

high pressure adsorption, normal pressure desorption

VPSA/VSA dedicated oil-free intelligent rotary vane air compressor to obtain oil-free, low pressure compressed air

Low pressure adsorption, vacuum desorption

Compressors

Compressors need oil injection screw air compressors to produce high-pressure, oil-containing compressed air.

Oil-free intelligent air compressor, special design for oxygen production, to obtain oil-free, low-pressure compressed air.

The effect of oil on equipment

The compressed air containing oil will pollute the molecular sieve when separating oxygen and reduce the adsorption efficiency of the molecular sieve.

This leads to a gradual decline in oxygen production and concentration, resulting in oxygen containing oil.

Oil-free compressed air prevents molecular sieve oil contamination.

The life and performance of the molecular sieve are not affected, ensuring stable oxygen production and concentration.

The oxygen produced does not contain oil.

If contaminated molecular sieves are not replaced in time, more molecular sieves will lose efficiency, resulting in high maintenance costs and reduced oxygen output and concentration.

Influence of pressure on equipment

The molecular sieve pressure of the adsorption tower is 0.55-0.75MPa.

Long-term high-pressure airflow erosion will cause wind erosion and crushing of molecular sieve mesh.The oxygen production decreased due to the decrease of sieve volume.

Adsorption column molecular sieve bearing pressure < 0.1MPa, is one tenth of PSA.

This avoids wind erosion and crushing of the molecular sieve, ensuring consistent oxygen production.

The life of molecular sieve was not affected and the oxygen production was stable.

The number of molecular sieves is proportional to the oxygen production.

PSA may require molecular sieve supplementation every 1-2 years.

The effect of pressure on energy consumption.

PSA requires high-pressure compressed air for molecular sieve adsorption, resulting in high energy consumption of air compressors.

Provides low pressure compressed air, significantly reducing energy consumption.

Compared with PSA, VPSA has low operating load and overall energy saving of about 40%.

Impact of pressure on safety and reliability

High pressure and operating temperature cause equipment to be exposed to high temperature and pressure for a long time, reducing safety and increasing failure rates.

Atmospheric pressure, low temperature, low failure rate.

No pressure vessel is used to ensure safe operation and reliable equipment performance.

The working temperature, working pressure, failure rate and energy consumption of mechanical and electrical equipment are proportional.