Nitrogen Generation System Working Principle Type Of Membrane

Nitrogen Generation System Working Principle Type Of Membrane

Working Principle of Membrane

The membranes are created within the kind of hollow fibers. Gas separation membranes work on the principle of selective permeation through a membrane surface.

The distinction between the partial pressure of the gas on the inner facet of the membrane and external facet. If larger this distinction, the bigger the permeation of gas through the membrane.

The permeation rate of every gas depends on its diffusion rate within the membrane. Gases with a higher diffusion rate and lower molecular size penetrate the membrane quicker than giant, lesser diffusion gases.

Each membrane module contains various hollow fibers. The high density of the fiber bundle provides a massive membrane area through that the air parts permeate with completely different velocities. element features a lower permeation rate than O2, carbon dioxide, and water vapor.

Thus these gases have the membrane and ventilated to the atmosphere at the safe location (particular attention shall be to the very fact that the ventilated gas to atmosphere is enriched with oxygen). sole element is the kick-off of the membrane. Refer to the top of the figure.

Working With Membrane type element Generation

The figure shows the simplified schematic of membrane sort N generation. the most parts of element generations square measure

1. Air compressor
2. Dryer Unit
3. Inlet Filters
4. Air Heater (Optional)
5. Membrane
6. Nitrogen Storage Reservoir

Also Read: Classifications Of Marine Steam Engine

Normally, the air is feed from a compressor so it passes through a drier unit wherever the wetness from the air is removed.

Then the dry air passes through the series of filters. The filters square measure accustomed to taking away the contamination gift within the air. Usually, 3 kinds of filters ar employed in the N generation system. the primary filter is employed to get rid of the particles up to one micron.

The second filter is employed to filter the particles up to zero.01 micron. The third filter is AN activated charcoal filter. it’s accustomed take away hydrocarbons up to zero.004 ppm.

Generally, the performance of the membrane is directly associated with the operating temperature of the air. If the in operation temperature of the air is below forty-five of, then the membrane performance can cut back drastically.

Thus a heater is introduced into the element generation system to take care of the temperature of the air around 55~60oC. If the feed air temperature is as regards to 55oC then the heater isn’t needed.

Then the air enters into the membrane bundle. every membrane module contains various hollow fibers. The high density of the fasciculus provides a colossal membrane area through that the air parts permeate with completely different velocities.

Element features a lower permeation rate than gas, carbonic acid gas, and water vapor. thus these gases have the membrane and ventilated to the atmosphere. solely element is the kick-off of the membrane and hold on within the element storage vessel.

Then the element is shipped to the top users (ie., compressor, pumps, tanks, etc.,) through element distributor networks.

Points to taken care whereas choosing Membrane sort element generator

• Membranes square measure work higher at a continuing temperature. Usually, the membrane’s potency gets higher at the upper temperature.
• Therefore, the element generator is mostly given Associate in Nursing electrical heater upstream the membrane modules so as to lift the air temperature to concerning 50~60°C.
• The maximum operating temperature of the membrane is around 65~75°C. If the in operation temperature of air reaches around 65oC, the element generation unit can trip.
• Inlet filter is enclosed within the membrane sort generator package so as to scale back the membranes plugging frequency.
• A gas analyzer is put in at the outlet of the element generation system to indicates performance and controls element purity to be among the necessity.

Advantages:

1. Proven technology additionally for off-shore applications
2. Simple and extremely reliable operation
3. Lower weight, footprint, and noise compared to different technologies
4. Easy to work and maintain
5. Future scale-up of membranes capability is simple, solely further membrane banks square measure required

Disadvantage:

1. Higher feed air consumption compared to different technologies
2. Higher electrical consumption compared with Pressure Swing sorption for recess air heating
3. Very sensitive to water, oil droplets and impurities
4. Irreversible fouling and straightforward breakage square measure the most issues regarding hollow fiber filtration.

The membranes square measure additional possible to interrupt once below high strain compared to different ways of element generation