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Технологии

PRESSURE SWING ADSORPTION – OXYGEN

A pressure swing adsorption (PSA) oxygen production unit is designed to output enriched oxygen extracted from feed gas (most often atmospheric air). This unit is particularly useful when high purity oxygen is required on a smaller scale or when cryogenic ASU technology is uneconomical.

Operational concept

• Cyclic operation:

Multiple layers of adsorbent operate in opposite phase to provide a continuous flow of oxygen.

• Pressure cycle:

Once nitrogen is captured by the adsorbent, oxygen passes through it as a product gas. Once the cycle is completed, reduced pressure releases the adsorbed nitrogen and regenerates the adsorbent for the next cycle.

• Selective adsorption:

PSA for oxygen production is normally based on adsorbents (such as zeolites) that have a high affinity for nitrogen. When air is compressed in the presence of an adsorbent, nitrogen will be preferentially adsorbed.

Main components

• Adsorbers:

Are filled with nitrogen selective adsorbents.

• Control valves and cycling mechanisms:

Enable compression, product extraction and pressure reduction.

• Air pre-treatment:

Filters and dehumidifiers are used to ensure the high quality of feed air.

Products

Oxygen: up to 50 tonnes per day.

Product purity

Oxygen: 90–95%

Use

• Medical applications:

Respiratory therapy and oxygen used by hospitals.

• Industrial processes:

For metal cutting, chemical synthesis and combustion enhancement applications.

• Environmental applications:

Such as wastewater treatment and oxygenation of aquaculture systems.

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