Psa Chemical Oxygen Generator , ASU Industrial Oxygen / Nitrogen Gas Plant

2. Process Flow Brief Description

PSA oxygen generator is an automatic equipment which separate oxygen from air. According to the performance of molecular sieve, its adsorption when pressure risen and desorption when pressure loose. Molecular sieve’s surface and inner surface and interior are filled with micro pores. Nitrogen molecule has a faster diffusion rate of molecular sieve and oxygen molecules has a slower diffusion rate. Oxygen molecules are enriched in the end from the absorption tower.

Oxygen generator is constructed according to the principle of operation PSA ( pressure swing adsorption ) and it compressed by two absorption towers filled up with molecular sieve. The two absorption towers are crossed by compressed air ( previously purified oil, water,dust, etc ) . While one of the absorption tower produce oxygen, the other one release nitrogen gas to atmosphere. The process comes in cycle way. The generator is controlled by a PLC.

3. Oxygen Generator Applications

a. Ferrous metallurgy: For electric furnace steel making, blast furnace iron making, cupola oxygen blasting and heating and cutting, etc

b. Non-ferrous metal refinery: It can improve productivity and reduce energy cost, also protect our environment.

c. Water process: For oxygen aeration active mud process, reaeration of surface water, fish farming, industrial oxidation process, humid oxygenation.

d. Customized equipment with pressure high up to 100bar, 120bar, 150bar, 200bar and 250 bar are available for cylinder filling.

e. Medical-grade O2 gas can be obtained by equipping extra purifying device for removing bacteria, dust and odor.

f. Others: Chemical industry production, solid garbage burning, concrete production, glass manufacturing...etc.

4. Technical Features

1). Full Automation

All systems are designed for un-attended operation and automatic oxygen demand adjustment.

2). Lower Space Requirement

The design and Instrument makes the plant size very compact,assembly on skids,prefabricated from factory.

3). Fast Start-up

Start-up time is only 5 minutes to get desired oxygen purity.So these units can be switched ON&OFF as per Nitrogen demand changes.

4). High Reliabiity

Very reliable for continuous and steady operation with constant oxygen purity.Plant availability time is better than 99% always.

5). Molecular Sieves life

Expected Molecular sieves life is around 15-years i.e. whole life time of oxygen plant.So no replacement costs.

6). Adjustable

By altering flow,you can deliver oxygen with precisely the right purity.

5. working principle

According to the press swing adsorption theory,the high quality zeolite molecular sieve as the adsorbent, under the certain pressure, zeolite molecular sieve has the adsorption capacity selectively,the nitrogen is adsorbed largely by the zeolite molecular sieve selectively, and the oxygen and nitrogen is separated.
We usd two adsorption towers, one adsorb the nitrogen to generate oxygen, one desorb the nitrogen to regenerate the zeolite molecular sieve, cycle and alternation,on the basis of PLC automatic process system to control the pneumatic valve open and colse, thus to get the high quliaty oxygen continuously.