• Compression in a nitrogen membrane system
The atmospheric air is sucked through the air filter (1) of the compressor (2) powered by an electrical motor. At the outlet of the compressor, the temperature of the air is between 80 to 100 degrees C and is full of oil particles in suspension. The oil is filtered through the oil separator (2)
1 - Air Filter This equipment usually ships with the compressor. Its role is to avoid any objects or heavy solid particles to get into the process. The original filter can be replaced on demand with an external one, of a bigger size when the environment is very dusty.
2 - Compressor + Oil separator This equipment exists on every lubricated air compressor to eliminate liquid oil as well as oil aerosol particles from the air mixture that is going into the system.
3- Cooling system
• Filtration in a nitrogen membrane system Filtration is maybe the most important step of on-site gas generation systems. In order to supply pure gases at optimal quality, the systems are drastically designed. Nothing is let to hazard to provide you with the best quality of gas.
4 - Condensate separator The cooling system (3) brings the air down at the inlet of the separator (4). This equipment is intended to remove liquid oil and water that was formed by condensation after the air was cooled.
5 - Coalescing filters Those 2 filters (5) remove oil and water aerosol droplets that are in suspension in the compressed air. The solid particles which size are under 0.01um are also stopped.
6 - Carbon tower This device is full of activated carbon. When the air goes through, the activated carbon catches in his pores the remaining vaporous oil phase in the air stream.
7 - Dust Filter This ultimate filter was placed in case that the activated carbon tower would release some microscopic grains of carbon with the time.
7-bis Liquid Detector Shuts the unit down in case of any liquid detection.
• Separation in a nitrogen membrane system
The separation is the core of the on site nitrogen generation systems. The clean air that comes out of the filtration line enters the modules (or bundles) (10) to be permeated. The residue (gas enriched in O2) is released, whereas nitrogen moves to the last part of the system : the production regulation.
9 - Heater This electric device heats the air to de-saturate it at the inlet of the bundle.
10 - Membrane module It's inside those modules (10) that the permeation principle separates the different molecules of gas. At the end of each module, there is a valve as well as an analyzer to regulate and optimize the productivity of the system in Nitrogen by balancing each of the modules in the system.
• Production in a nitrogen membrane system
Those regulation devices watch and adjust the quality of the production of nitrogen in real time. The product flow is controlled by PLC either by purity regulation or by a patented cascade design based on the product purity and the product flow rate to enable a smooth and optimal production control.
11 - Flow regulator This automatic valve permanently adjusts the flow rate of Nitrogen at the outlet of the system to maintain the same level of purity needed.
12 - Production Valve This valve is open when the system starts and closes to turn the system to production mode when needed pressure is accessed and concentration of N2 is obtained.
14 - Oxygen analyzer : It measures the concentration of O2 in the N2 stream. If the level of Oxygen gets too high, an alarm is set on and stops the Unit. This alarm level is configurable by the user to meet his requirements.
15 - Controlled temperature zone The temperature inside the cabinet of the system is maintained to a constant temperature to avoid condensation as well as changes of phases (Liquid-vapor-aerosol) during the filtration process.
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