Membrane nitrogen gas generators

How it works

Ambient air contains nitrogen (78.1%), oxygen (20.9%), argon (1%), carbon dioxide, water vapor and traces of other inert gasses. Pressurized air is led through hollow fibre membranes . The various air components diffuse through the porous wall of the membranes.

The diffusion rate differs for the various gasses:

• Oxygen and water vapour have a high diffusion rate and diffuse rapidly through the membrane wall.

• Nitrogen has a low diffusion rate and diffuses slowly through the membrane wall. Nitrogen enriched air is released at the outlet of the membranes. Pressurized nitrogen enriched air is released at the outlet of the membranes. This air can be lead to a nitrogen storage vessel.

Features

• Can operate from a standard factory compressed air supply

• Delivers 5% down to 0.5% oxygen content, without the need for any additional purification

• Built-in oxygen analyser for continuous purity monitoring

• Digital and analogue outputs for remote monitoring

• Alarm capabilities

• User friendly control interface

• Alarm capabilities

• User friendly control interface

• Compact design

• Modular concept

Process parameters

The nitrogen production depends on these parameters:

• Flow rate. The lower the flow rate of compressed air through the hollow fiber membranes, the more oxygen can move through the membrane wall. As a result the nitrogen produced at the outlet will have a higher purity.

• Temperature. The Membranes operates optimally at a temperature of about 20-25°C (68°- 77°F). If the temperature increases, the pressurized air consumption will also increase. Do not place the system in a room where the temperature may rise unnecessarily high.

• Membrane pressure. A higher membrane pressure will increase the capacity of the Membrane.

• External pressure. There must be atmospheric pressure at the vent outlet. The capacity and the selectivity of the system decrease dramatically if the vent outlet pressure exceeds atmospheric pressure.

Benefits

• Up to 90% cost savings. Typical capital pay-back is achievable within 12-24 months.

• Energy savings. Does not require an inlet air heater and can operate from a standard factory compressed air supply.

• Convenient and safe. The easy to use system is simple to install, requires minimal maintenance and eliminates safety hazards associated with traditional gas supplies.

• Space saving design. The compact design means the system demands less floor space.

• Flexible modular option. The modular concept allows the generator to grow with the factory.

• Reduced carbon footprint. The elimination of cylinder deliveries and transportation means carbon footprint can be reduced