Introduction

HGPL Offers Below Given Nitrogen Generation Plant Models:

1. Nitrogen RP

First and basic model for producing Nitrogen Gas which requires only compressed air to produce Nitrogen Gas at a desired flow. Nitrogen is produced by PSA (Pressure Swing Adsorption) technology in the bed filled with molecular sieve.

This is a twin tower system. Where one tower is in adsorption mode, other one is in re-generation mode hence ensuring continuous operations.

Carbon Molecular Sieve – CMS used in PSA system is from Carbotech-AcGmBH.

Purity achieved from this unit is 99% (vol.).

Guaranteed Parameters:

Process Flow:

2. Nitrogen HP

High Purity Nitrogen HP-Model is offered by HGPL in the field of NITROGEN GENERATION PROCESS by reducing oxygen(impurity) content as low as it can i.e. below 5 ppm.

A PSA system (as in NITROGEN LP-model) is followed by additional purification unit using palladium as catalyst for removal of oxygen & moisture contents upto 1 PPM level.

The De-oxidation unit is a reactor bed filled with Palladium Catalyst.

The Nitrogen, coming directly from the PSA System with the remaining Oxygen, is mixed with Hydrogen before entering the catalyst reactor.
At the catalyst surface the oxygen reacts with Hydrogen to produce water and heat.

The heat and water have to be removed by a standard water separator after cooler and gas dryer to required level.

The remaining hydrogen concentration in the Nitrogen is around 0.5 to 1% minimum.

The high purity HP-Model finds application in chemical/electronics/ metallurgical industries.

Maximum purity achieved from this unit is 99.99% (vol.).

Carbon Molecular Sieve – CMS used in PSA system is from Carbotech-AcGmBH.

Guaranteed Parameters:

Process Flow:

3. Nitrogen UHPr

High Purity Nitrogen HP-Model is offered by HGPL.

In this model, different type of DE-Oxidation unit is used for additional cleaning using.

copper catalyst is used for removal of extra Oxygen, the moisture and Hydrogen contents are maintained upto 1PPM level.

This Ultra-pure nitrogen gas finds application in electronic, synthetic fibre and optical fibre industries. These systems are installed where along with Oxygen & Moisture, Hydrogen is not desired in the Nitrogen gas Stream.

This DE-Oxidation unit consists of two externally heated and filled columns with copper as catalyst for the endothermic reaction.

The loaded copper bed can be regenerated by adding Hydrogen during the regeneration step.

For this two-step process (Deoxidization and regeneration), two reactors are necessary to achieve a continuously operating DE-OXO system.

The nitrogen from the PSA System with the remaining oxygen passes over one of the reactors without adding Hydrogen. On passing through the reactor, the oxygen is removed by reacting with the copper surface.

The advantage of the DE-OXO unit based on the copper is that the high purity nitrogen leaves the unit absolutely dry & without any remaining Hydrogen.

Maximum purity achieved from this unit is 99.9999% (vol.).
Carbon Molecular Sieve – CMS used in PSA system is from Carbotech-Ac GmBH.

Guaranteed Parameters:

Process Flow:

Applications of Nitrogen Gas

Steel & Metal Processing

It is often used in annealing stainless-steel alloys, magnetic steel alloys, sintering and copper brazing.

Nitrogen gas also acts as a reducing agent in processing metallic ores, an important application in metallurgy and industries requiring pure metals.

Nitrogen is mixed with Hydrogen, mixture known as HNX to obtain a reducing atmosphere, which is required for many applications in the metallurgical industry, such as heat treating steel and welding.

Float Glass

In order to allow the irregularities in the glass to even out, the glass is held in a controlled atmosphere with a ratio of approximately 90% N2; : 10% H2.

To produce sheets of flawless glazing for windows, doors, etc., a continuous ribbon of glass is “floated” on a bed of tin. The hydrogen in the controlled atmosphere acts as a scavenging agent to ensure an oxygen-free environment, since molten tin is highly sensitive to oxidation.

Food Packaging & FMCG Industry

Being inert in nature (unlike Oxygen and Air), Nitrogen is used to preserve food items by keeping Oxygen and Moisture away.

When compressed, it is also used for pneumatic operations in the industrial machinery.

Emergency and Purging Applications

Being an inert gas and having the ability to freeze, Nitrogen is used for emergency flushing in case of fires.

Also, nitrogen is used to flush any system or plant machinery pre and post startup and shutdown respectively.

Gas Blanketing

A critical nitrogen gas application is the blanketing of storage tanks for volatile chemical compounds.

2. VPSA Based Oxygen Generation Plant

In this process, Air from a Blower is first cooled in an Aftercooler to reduce its moisture content and condensed moisture is separated in Moisture Separator.

The cooled air passes through a Tower containing an adsorbent which has the property to separate Oxygen from the air resulting in a gas contains 93% Oxygen (balance being Argon & Nitrogen) coming out as product gas.

To ensure continuous flow of product gas, the other Tower is simultaneously regenerated by extracting the gases adsorbed in the previous cycle by a Vacuum Pump.

Automatic operation is achieved by opening & closing the valves in a pre-set sequence by using a PLC.

The Oxygen product flow is compressed to the required discharge pressure, if required and fed to end use process.

Power efficient systems with Flow achievable from 500-5000 Nm3/hr.

The waste gas is 80-85% Nitrogen and 11-15% Oxygen which is vented to atmosphere via discharge silencer.

Guaranteed Parameters:

Process Flow: