PSA Nitrogen Generator 95–99% Purity

This PSA nitrogen generator produces nitrogen at 95–99% purity on site using carbon molecular sieve (CMS) in a twin-tower pressure swing adsorption system.

Flow ranges from 1 to 2000 Nm³/h with outlet pressure from 0.1 to 1.0 MPa and a dew point of -40°C or lower, and the two adsorber vessels alternate between adsorption and regeneration to give a continuous supply.

This is the entry purity tier: it needs the least feed air per Nm³ of nitrogen and suits duties where simple oxygen displacement is enough rather than a tight oxygen limit.

Typical service covers general purging, tyre inflation, conveyor blanketing, tank inerting and grain storage.

The PSA nitrogen range is published as a purity and capacity configuration rather than a numbered model table: fix the purity tier first, then the flow, outlet pressure and dew point for the duty.

• Adsorption towers: two adsorber vessels alternate between adsorption and regeneration, so the nitrogen supply is continuous.
• Molecular sieve: carbon molecular sieve (CMS) retains oxygen at pressure while nitrogen passes through as product gas; when a bed approaches saturation it is depressurised and the captured oxygen is vented.
• 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 residual oxygen in the product nitrogen, and its calibration is checked on schedule.
• Feed air: clean compressed air at 0.6–0.8 MPa with a dew point of -40°C or lower, oil-free.

• General purging: provides nitrogen for purging and displacement of air in vessels, tanks and pipework.
• Tyre inflation: supplies nitrogen for tyre inflation and pressure-maintenance service.
• Conveyor blanketing: blankets conveyor and process areas where oxygen ingress must be reduced.
• Tank inerting: inerts storage tanks to lower the oxygen content of the vapour space.
• Grain storage: supplies nitrogen for grain and agricultural storage protection.
• Packaging and warehousing: supports general packaging and warehouse blanketing duties.

• Confirm the required purity first, because it determines the CMS charge and the nitrogen flow available from a given skid.
• Check the required flow and outlet pressure against the 1 to 2000 Nm³/h and 0.1 to 1.0 MPa ranges.
• Specify the dew point requirement; the system delivers -40°C or lower.
• Confirm the feed-air supply is oil-free with a dew point of -40°C or lower, as this protects the sieve bed.
• For critical uptime, plan a small liquid-nitrogen backup to cover maintenance windows.
• State the power supply and installation conditions for a complete system selection.