working principle
The membrane separation nitrogen generator technology separates nitrogen and oxygen in the air based on their different solubility and diffusion coefficients in the membrane under the pressure difference on both sides of the membrane. Some gases with high permeability, such as water vapor and oxygen, first pass through the membrane to become oxygen rich gases, while nitrogen with slower permeability is retained and enriched, becoming dry nitrogen rich gases, achieving the purpose of oxygen nitrogen separation.
Technical indicators
Nitrogen production: 5-3000Nm3/h
Nitrogen purity: 95%~99.9%
Nitrogen pressure: 0.1~2.0Mpa (adjustable, pressurized)
Nitrogen dew point: -40 ° C~-60 ° C
Different gases are separated based on their permeation rates when passing through hollow fiber membranes

Schematic diagram of nitrogen production by membrane separation

The membrane separation nitrogen generator separates nitrogen and oxygen through hollow fiber membranes. Oxygen is a "fast" gas that selectively diffuses through the membrane wall, while slower nitrogen continues to flow along the interior and smaller parts of the fiber, forming a high concentration airflow and reaching the outlet of the fiber bundle where it is collected. Oxygen rich or permeable gases are discharged from the membrane separator at atmospheric pressure. The physical reason for separation is the difference between the partial pressure of gas inside the hollow fiber and the external pressure. No need to drive valves or moving parts, simplicity and reliability are the foundation of this technology, from system installation to nitrogen production and related maintenance. The inlet of the membrane generator only requires clean compressed air with constant temperature (or even humidity) to be immediately put into production. Many nitrogen applications require high purity for inerting or fine and precise purposes (such as in the food or pharmaceutical industry), and membranes can produce nitrogen with a purity of up to 99.9%.

Process of membrane separation nitrogen generator

The process of membrane separation nitrogen generator and PSA pressure swing adsorption nitrogen generator is roughly the same. The air is compressed, purified, and separated into nitrogen gas, which is finally stored in a nitrogen buffer tank. The difference lies in the method of separating and removing nitrogen gas. Membrane separation mainly uses central control fiber membranes for nitrogen and oxygen separation. Compared to PSA nitrogen generators, the nitrogen purity is not as high, generally below 99.9%. The membrane separation nitrogen generator also has its own advantages:
1. Simple operation, reliable operation, high degree of automation, no moving parts, no need for cyclic switching, meeting the requirements of long-term continuous operation;
2. Convenient and fast start/stop, qualified nitrogen can be produced in about 10 minutes after startup: low operating energy consumption, continuously adjustable nitrogen purity;
3. The gas separation process is noise free, pollution-free, does not produce harmful waste, and has high nitrogen production cleanliness;
4. The nitrogen production capacity of the system can be expanded by adding membrane components to meet customers' needs for different nitrogen production rates;
5. Equipped with a membrane inlet quality detection and protection device, ensuring qualified gas enters the membrane module and improving the service life of the membrane;
6. The whole machine has a compact structure, easy installation, small footprint, wide applicability, and can resist many chemical pollutants.
As long as it is mechanical equipment, regular maintenance and upkeep are indispensable. After all, the wear and tear generated by equipment in daily work will increase the probability of failure.
Daily maintenance of membrane separation nitrogen generator
1. Regularly check and clean the blockages at the drain outlet and heat dissipation hole of the air compressor storage tank;
2. Regularly clean the air inlet filter and the cooling fan inlet filter; And the oil level and safety valve level;
3. Clean the fins of the radiator; Check whether the drain valve and pipeline are normal;
4. Check the drain valve and pipeline of the filter to confirm that they are not blocked;
5. Regularly use a damp cloth or neutral soapy water to clean the dust, oil stains, and water on the equipment to keep it clean and tidy.
Regular maintenance of membrane separation nitrogen generator
1. Carefully review the product manual and regularly replace the air compressor oil, air filter, oil filter, oil fine separator, three-stage air filter, etc. as required.
2. Regularly check safety valves, belts, wiring terminals, threaded connections, refrigerant levels, and various instruments according to the product manual to ensure that there are no problems.
3. Regularly replace the filter to reduce the wear and tear on the membrane's lifespan.