Airro Engineering Company

Savli, Vadodara, Gujarat

Nitrogen gas generator produces nitrogen gas from atmospheric air based on PSA (Pressure Swing Adsorption) technology. We provide variety of PSA Nitrogen gas generator, Nitrogen Plant, in all kind of industries such as Chemicals, Pharmaceuticals, Bulk Drugs, Food, Electronic Industry, Steel, Coal Mines, etc. PSA technique is simple and reliable process of separation of nitrogen gas form compressed air by adsorption of oxygen over a compact tower of carbon molecular sieves.

The Treated atmospheric compressed air enters an adsorption tower where it comes in contact of carbon molecular Sieves that binds the oxygen molecules and allows nitrogen to pass through void space. Pure nitrogen flows product delivery operation and once the oxygen capturing capacity in a bed is diminished the feed switches to a new adsorption tower and the old bed is regenerated through rapid depressurization and is ready for the next cycle.

PSA Nitrogen system comprises of four main operations :

Air Compression -> Air Pretreatment -> Adsorption / Desorption -> Product Delivery

EXO-gas generators produces protective atmosphere for heat treatment furnaces. Lean exo-gas or rich exo-gas is produced simply by changing air/fuel ratio.

Lean exo-gas generators are suitable for non-ferrous metals heat treatment whereas rich exo-gas generators are used for heat treatment of steel/brazing/annealing applications.

Oxygen gas generators are based on the PSA technology. A special grade of synthetic Zeolite, known as molecular sieves is used to separate oxygen from atmospheric air. Oxygen generator consists of two absorption vessels, filled with molecular sieves are alternately charged with compressed air up to 5 bar pressure. Nitrogen is adsorbed and enriched oxygen flows to the surge tank. After the adsorption cycle, one bed is depressurized to atmospheric pressure, thereby evacuating nitrogen and sieve bed gets regenerated completely by counter current oxygen flow from the other bed.

Nitrogen gas generators produces nitrogen gas from atmospheric air by PSA (Pressure Swing Adsorption) technology. PSA technique is a simple & reliable process of separation of nitrogen from compressed atmospheric air by adsorption of oxygen over a bed of Carbon Molecular Sieves (CMS). CMS is an adsorbent having infinite number of small pores. The diameter of the Bottle Necks is in the same range as those of the molecules. Thus when CMS is used in the PSA process, an Oxygen Molecule, having a smaller diameter than a Nitrogen molecule traps in to the pores. Therefore the nitrogen is recovered to a high degree while almost all the oxygen is adsorbed. Process The production of nitrogen gas from atmospheric air is based on pressure swing absorption (PSA) principle by adsorption of oxygen gas using a special grade of imported carbon molecular sieves (CMS). Atmospheric air is compressed by an air compressor to a pressure of 7.0 kg/cm2g and cooled to ambient temperature in a shell and tube type heat exchanger. The condensed moisture shall be drain out automatically from air receiver by automatic drain valve (ADT). The compressed air at ambient temperature is passed through PSA module packed with activated alumina and special grade of Carbon Molecular Sieves. The production of Nitrogen from air by PSA technology is largely based on the kinetic separation. Oxygen that is smaller in size (kinetic diameter 3.46 A0) diffuses much faster than Nitrogen (kinetic diameter 3.64 A0) and hence oxygen gets adsorbed in carbon molecular sieves and Nitrogen is collected as the high-pressure product. The entire operation is fully automatic and controlled by a combination of sequence programmer and quick change over valves. Nitrogen gas of desired purity at 5.0 kg/cm2g pressure and having a Dew Point of (-) 40 degree celcius is produced by the PSA Unit, now flows to a surge vessel to balance the fluctuations in pressure and concentration. Now the gas can be stored in a storage tank at 5 Kg/cm2g pressure from where it can be made available for process application. The storage tank can selected of any desired capacity as per peak hours demand for Nitrogen gas or power interruptions. This system is fully automatic and need not any special operator for operation. Once it is started it generates Nitrogen at constant flow rate and at constant pressure. Further the produced nitrogen gas can be boosted to high pressures by providing any reliable booster compressors up to 40 kg/cm2g pressure. We offer three models of nitrogen gas generators and selection is based on the purity required

Principle Of Operations Oxygen gas generators are based on the PSA technology. A special grade of synthetic Zeolite, known as molecular sieves is used to separate oxygen from atmospheric air. Oxygen generator consists of two absorption vessels, filled with molecular sieves are alternately charged with compressed air up to 5 bar pressure. Nitrogen is adsorbed and enriched oxygen flows to the surge tank. After the adsorption cycle, one bed is depressurized to atmospheric pressure, thereby evacuating nitrogen and sieve bed gets regenerated completely by counter current oxygen flow from the other bed. Salient Features 1) Operation is cyclic and automatic. 2) Automatic start-up and shut-off. 3) Working life of molecular sieves is almost 10 years on continuous run of the plant. 4) Very low maintenance cost. Applications Steel Plants Welding Brazing Paper IndustriesChemical Oxidation Battery Manufacturing Ozone Generation