Do PSA Oxygen Generators Provide Pure Oxygen?

July 22, 2022

Pressure swing adsorption is the process used by a PSA oxygen plant to extract oxygen from the air. The adsorber and the desorber are the two chambers that make up the plant. In the adsorber, oxygen is absorbed by a bed of activated carbon as compressed air travels over it.

The desorber is where the pressure is released and the carbon desorbs the oxygen after the compressed air has entered. The oxygen is then sent to the consumer after being cooled and compressed. Hospitals, classrooms, and other locations requiring a lot of oxygen employ PSA oxygen plants. Industrial-grade oxygen is also produced in PSA oxygen plants for use in metal cutting and welding.

Air is made up of 0.1 percent various trace gases, 78 percent nitrogen, 0.9 percent argon, and 21 percent oxygen. This oxygen is extracted from compressed air by hi-tech oxygen generating devices using a method known as pressure swing adsorption (PSA)

The Pressure Swing Adsorption method uses a synthetic zeolite molecular sieve's capacity to absorb mostly nitrogen to produce enriched oxygen gas from ambient air. Oxygen Gas is a byproduct while nitrogen condenses in the pore system of the zeolite.

A PSA oxygen plant should be at the top of your list if you're looking to purchase an oxygen production facility. Compared to conventional methods of producing oxygen, PSA oxygen plants have a number of benefits. PSA plants are a great option for tiny or remote sites because they are also reasonably compact and require little upkeep. Additionally, PSA technology is getting more and more inexpensive, making it a sensible choice for larger operations.

Do PSA Oxygen Generators Provide Pure Oxygen?

PSA oxygen generators can easily produce oxygen with a purity of up to 95%; the remaining 5% is typically a mixture of inert gases like nitrogen and argon. While many applications, like water purification and furnace enrichment, are suitable for this purity, they might not be suited for those where 99 percent purity is required.

The majority of applications are suited for our PSA oxygen generators since they can deliver oxygen directly at 5 kg/cm2g pressure without the need for an additional booster. We offer an additional booster if the client procedure or storage calls for higher pressure.

Equipment called pressure swing adsorption (PSA) oxygen generators use adsorbents to capture nitrogen gas from the air to produce oxygen with a purity of 90 to 93 percent. Vacuum swing adsorption, vacuum pressure swing adsorption, and pressure vacuum swing adsorption are additional names for the procedure (VSA).

These generators efficiently remove nitrogen from the air through adsorption under pressure to create high-purity oxygen by making use of the fact that the adsorption amount of the adsorbent (synthetic zeolite) under pressure is larger for nitrogen than oxygen.

They have been used in places that utilize a lot of oxygen because they can deliver a steady supply at a lower price than liquid oxygen.

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Concept Of Adsorption

The affinity of fluid for a solid surface is known as adsorption. It is feasible to separate the distinct components of a gas mixture (like air) using their varying affinities. That is essentially how a PSA oxygen plant operates.

The ability of such a plant to produce oxygen can vary. It makes use of a technique that concentrates oxygen for delivery to hospitals or the industry, depending on the situation, by absorbing nitrogen from the surrounding air. The oxygen produced in this way can be delivered directly to the location of usage through a dedicated pipeline or compressed to fill cylinders.

How Does PSA Oxygen Generator Produce Pure Oxygen?

This method is based on the idea that certain gases have a tendency to be more or less strongly attracted to various solid surfaces. This takes place when nitrogen is drawn to the zeolites. The oxygen and nitrogen are less adsorbed and are transported to the end of the zeolite bed before being retrieved in the oxygen buffer tank as the air is compressed, forcing the nitrogen into the crystalline cages of the zeolite. When using two zeolite beds at once: Under pressure, one filters the air, allowing oxygen to pass through but nitrogen to become saturated. While the first filter regenerates, nitrogen is expulsed (desorbed) by releasing the pressure, starting the second filter to function similarly.

To understand the process in simpler terms

1. Filtered, degreased, and dried compressed air (78 percent nitrogen, 21 percent oxygen, and 1 percent argon) is used, and the production pressure is automatically controlled.

2. Zeolite absorbs nitrogen as it passes through the molecular sieves, raising the oxygen percentage in the air to 95%.

3. The oxygen generated from the molecular sieve is transported via the buffer tank by way of a multifunction block.

4. Nitrogen is driven back outdoors after being silently discharged.

5. While the second vessel ensures oxygen production, some of the oxygen created is used to aid with one vessel's nitrogen desorption (and vice versa).

6. A pneumatic and automated vessel balance mechanism ensure a steady supply of oxygen.

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