PSA nitrogen generation adopts carbon molecular sieve as adsorbent whose capacity of adsorbing oxygen is larger than adsorbing nitrogen. The two adsorbers (a&b) alternately adsrbing and regenerating to separate oxygen from nitrogen in air to obtain purified nitrogen by Auto-operated valves controlled by PLC.

1. Compressed air system

Air compressor supply the raw material air for the nitrogen generator. The nitrogen making system need high quality,stable pressure and enough air consumption.Air compressor should use the reliable, maintenance easily,low noise,screw air compressor.

2. Pressure Swing Adsorption Nitrogen making system

Pressure swing adsorption (PSA) is an advanced gas separate technique,it is widely used in gas supply field in the world.

2 .1 Adsorbing material

Adsorbing material is the center part of PSA nitrogen generator,Normally use the the Carbon Molecular Sieve,it can adsorb the oxygen,CO2,water in the air,but can't adsorb the nitrogen..

2.2 PSA principal

Because O2 and N2 these two gas molecule have diffusion rate difference on the molecule sieve surface,O2 smaller diameter can diffuse faster,most of them inlet micropore of CMS,the large diameter N2 diffuse slowly,less of them can inlet ,use this adsorption difference come true O2 and N2 separate.

2.3 PSA N2 making processing

(1)Inlet air:The air compressor press the air into transporting pipe,then use the compressed air clarification system to remove the water,oil,dust and so on,reach to air buffer tank,then pass through air buffer tank into two adsorption tower.

(2),Adsorption: When air inlet adsorption tower,during the pressure function,O2 and CO2 be adsorbed quickly.Formed N2 near the outlet position.

(3),Air outlet :When the adsorption process working in the best status(Adsorption N2:O2 is the smallest),open the outlet valve,transport the N2 into N2 buffer tank.

(4), Average pressure:After finished exhaust,rest some N2 in the tower,so let it into another tower adsorb again with new air.This process is finished when the pressure of two tower is the same,so called average pressure.

(5),Exhaust :After average pressure finished,need to releasing the air which adsorb by CMS to be ready for next adsorption,the programme will open the air releasing valve automatically,let the pressure in the tower back to the original status,meanwhile release the O2,CO2,so than the CMS can adsorb new air again.

(6), These two tower exchange work can got N2 purity 99.9 %

Please check below chart of CMS adsorb under different pressure of O2 and N2 :

Specification:

Item	Technical	Remark
N2 flow rate	150Nm3/h	Standard state
N2 purity	≥95.0%	non-oxygen content
N2 outlet pressure	0.1~0.6Mpa	Gage pressure, adjustable
N2 outlet dew point	≤ 45 °C	Atmospheric dew point

Applications
1.) Metallurgy: For anneal protection, agglomeration protection, nitrogenizing, furnace washing and blowing, etc. Used in fields such as metal heating treatment, powder metallurgy, magnetic material, copper process, metallic mesh, galvanized wire, semiconductor, etc.
2.)Chemical and new material industries: For chemical material gas, pipeline blowing, gas replacement, gas protection, product transport, etc. Used in fields such as chemical, urethane elastic fiber, rubber, plastic, tyre, polyurethane, biological technology, intermediate, etc.
3.)Electronic industry: For encapsulation, agglomeration, anneal, deoxidization, storage of electronic products. Used in fields such as peak welding, circumfluence welding, crystal, piezoelectricity, electronic porcelain, electronic copper tape, battery, electronic alloy material, etc.

Features of Our Products
Full Automation
All systems are designed for unattended operation and automatic Nitrogen demand adjustment.
Low Electric Energy Consumption
All systems are designed for Energy-Efficient.
Lower Space Requirement and Short installation period
The design and Instrumentation makes the plant size very compact, assembly on skids, prefabricated and supplied from factory. Tongyue Machinery has own TRUE brand of gas separation equipments.
Installation is very easy and convenient.
Fast Start-Up
Start-up time is about 30 minutes to get desired Nitrogen purity. So these units can be switched ON & OFF as per Nitrogen
Demand changes.
High Reliability
Very reliable for continuous and steady operation with constant Nitrogen purity. Plant availability time is better than 98% always.
Molecular Sieves Life
Expected Molecular sieves life is more than 10-years i. e. Whole life time of Nitrogen plant. So no replacement costs.
Simple operation and maintenance
All systems are designed by integrated solution for easy-operation and easy-maintenance.

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