PSA Oxygen Generator for Industrial Applications

This PSA oxygen generator produces oxygen at 90–95% purity on site using zeolite molecular sieve (ZMS) in a twin-tower pressure swing adsorption system.

Flow ranges from 1 to 500 Nm³/h with outlet pressure from 0.1 to 0.4 MPa and energy use of 0.3 to 0.5 kWh per Nm³ of oxygen produced, and the two towers alternate between adsorption and regeneration for a continuous supply.

The sieve separates oxygen from compressed air at the plant, so the oxygen does not have to be delivered and the supply can be sized to the actual duty.

It is used for aquaculture aeration, wastewater aeration, metallurgy enrichment and combustion enhancement; the standard range is not intended for direct respiratory medical use.

The PSA oxygen range is published as a purity and capacity configuration rather than a numbered model table: fix the required oxygen flow first, then confirm purity, outlet pressure and energy use for the duty.

• Adsorption towers: two adsorber vessels alternate between adsorption and regeneration, so the oxygen supply is continuous.
• Molecular sieve: zeolite molecular sieve (ZMS) selectively adsorbs nitrogen from the compressed air so oxygen passes through as product gas at 90–95% purity.
• Air dryer: the package includes an air dryer that brings the compressed-air moisture load down so the feed-air dew point requirement is met before the air reaches the sieve bed.
• Filtration: filtration stages remove oil aerosol and dust carried over from the compressor and receiver, protecting the sieve bed.
• Air receiver: a buffer tank (air receiver) between the compressor and the PSA towers steadies the feed-air supply.
• Control cabinet: PLC automatic control with an optional HMI touch screen; the control cabinet manages the valve cycle and the operating parameters.
• Purity monitoring: an oxygen analyser monitors the purity of the product oxygen, and its calibration is checked on schedule.
• Feed air: compressed air at 0.6–0.8 MPa with a dew point of -40°C or lower, oil-free.

• Aquaculture aeration: supplies oxygen for dissolved-oxygen enrichment in fish and shrimp ponds.
• Wastewater aeration: provides oxygen for oxygen-enhanced aeration of the biological treatment stage.
• Metallurgy enrichment: enriches combustion air and supports oxygen enrichment in metallurgical processes.
• Combustion enhancement: raises the oxygen content of combustion air to improve combustion in furnaces and kilns.
• Glass manufacturing: applied to combustion efficiency improvement in glass production.
• Chemical oxidation: supports oxidation processes in chemical production.
• Cutting and welding support: supplies oxygen for metal cutting and welding support duties.

• Confirm the required purity and flow first, since these set the ZMS charge and the system size.
• Check the outlet pressure against the 0.1 to 0.4 MPa range and the energy use of 0.3 to 0.5 kWh per Nm³ when sizing power and operating cost.
• Confirm the feed-air supply is oil-free with a dew point of -40°C or lower, conditioned by an air dryer and filtration stages.
• Remember that standard PSA oxygen at 90–95% is not for direct respiratory medical use without certified medical-grade equipment.
• State the application, operating hours and installation conditions so the package can be sized as one system.
• Allow for start-up to rated purity of 30 minutes or less when planning the production schedule.