PSA PLANTOXYGEN GENERATION SYSTEMS

WHAT IS PSA?

Pressure Swing Adsorption (PSA)

Pressure Swing Adsorption (PSA) is a technology used to separate some gas species from a mixture of gases under pressure according to the species' molecular characteristics and affinity for an adsorbent material.

HOW PSA PLANT WORKS? Process:

Pressure swing adsorption processes rely on the fact that under high pressure, gases tend to be attracted to solid surfaces, or "adsorbed".

It has 2-vessels filled with molecular sieves. Clean compressed air at 30º c temp. Is passed through 1-vessel and oxygen comes out as product gas. The other vessel is depressurized to atmospheric pressure and purged with little quantity of oxygen coming out from other vessel.

AIR

Air, mixture of gases that composes the atmosphere surrounding Earth.

As we know Air contains 21% Oxygen, 0.03% CO2, 78% Nitrogen, 0.9% Argon and 0.1% other trace gases. Oxygen generation systems separate this oxygen from Compressed Air through a unique process called Pressure Swing Adsorption. (PSA).

MOLECULAR SIEVES (ZEOLITES)

Molecular Sieves is a material that can absorb largeamount of moisture and certain other gases. (Used in separation of mixture).

It containing tiny pores of uniform size that is used as an adsorbent for gases and liquid.

Molecular Sieves comes in different Type, 3A, 4A, 5A and 13X ( used in oxygen plants).

MOLECULAR SIEVES 13X

It is a form of SODIUM base - type -X crystal structure (Pore diameter of MS is 10angstrom (i.e. - 1.0nm) )It absorbs the kinetic diameter less than 10A and excluded the larger size.They are in the form of pellets & spheres. It is commonly used for the separation of N2, from O2. This is its unique Characteristics. Application of Molecular Sieve 13X are: PSA Plant, Carbon dioxide (CO2) Removal, Mercaptans removal from LPG, Aerosol industries. Etc..

APPLICATION OF PSA

Refineries

Nitrogen Generator Medical

Industry

Bio-Gas Plant

ADVANTAGES OF PSA ADSORPTION PROCESS

(1) Complete automation and simplicity of operation(2) No manned attendance required during operation(3) Enhanced failure safety and reliability(4) Quick start and stop (5) Moderate dimensions and light weight (6) Low noise level(7) Extended operational life(8) Low operating costs(9) No special workshop requirements(10) Easy installation and integration into an existing air system.

DISADVANTAGES OF PSA ADSORPTION PROCESS

•Relativity low oxygen purity - 93-95% for adsorption

•Limited capacity.

PROCESS ( STEP BY STEP)

Compression feed air and conditioning:Using an air compressor, the ambient air gets compresses, dried by an air dryer and then filtered before entering the process vessels.

OXYGEN GENERATION SYSTEM

•PSA is Primary used in Oil Refineries.

•The separation of carbon dioxide from biogas to increase the methane (CH4) content.

•Nitrogen generator units employ the PSA technique.

•PSA technology has a major use in the medical industry to produce oxygen. Etc..

RECEIVER:

THE ADSORPTION AND DESORPTION PROCESS TAKE PLACE AT EQUAL TIME INTERVALS, AND THERE IS CONTINUOUS GENERATION OF OXYGEN. BY USING A CONNECTED OXYGEN RECEIVER, A CONSTANT PRODUCT FLOW AND PURITY IS MAINTAINED, WHICH CAN STORE THE OXYGEN WITH PURITIES UP TO 95%.

OXYGEN (O2) APPLICATIONS AND USES

Pulp and Paper

Industries

Ferrous & Non-

Ferrous Metals

Chemical and Petrochemical

Industries

Hospitals

Fish Farming

Glass Industry

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