Will the purity of a nitrogen generator decrease after being used for a period of time?

Classification: Industry News

Release time: 2023-07-15

Summary:

Industrial nitrogen generation at normal temperature generally uses two methods: pressure swing adsorption (PSA) and membrane separation. Both methods generate nitrogen at normal temperature and do not require high air pressure; ordinary piston air compressors and screw air compressors can meet the requirements.
The process flow of these two nitrogen generation methods is as follows:
Pressure swing adsorption (PSA) nitrogen generation: The air compressor discharges compressed air, which reaches the air filter group, then the air buffer tank, and then the pressure swing adsorption tower. Nitrogen and oxygen are separated using a carbon molecular sieve; oxygen is discharged, and qualified nitrogen is sent to the nitrogen buffer tank; unqualified nitrogen is discharged.
Membrane separation nitrogen generation: The air compressor discharges compressed air, which reaches the air filter group, then the air buffer tank. The purified compressed air passes through the membrane group; oxygen is discharged, and qualified nitrogen is sent to the nitrogen buffer tank; unqualified nitrogen is discharged.
The principles of these two nitrogen generation methods are different, but the process flow is similar. Three main standards are used to evaluate nitrogen generators: purity, pressure, and flow rate.
After a nitrogen generator has been used for some time, if the same pressure and purity are to be maintained, the flow rate must be reduced. This is because the core components of the nitrogen generator, the carbon molecular sieve and the membrane group, have high requirements for air cleanliness. Therefore, a filter group is installed after the air compressor. After a period of use, the filter cartridges in the filter group will become clogged, reducing efficiency and causing a significant drop in compressed air pressure, reducing the efficiency of the nitrogen generation unit and decreasing nitrogen production. At this time, the filter cartridges need to be replaced promptly.
The general replacement cycle for industrial nitrogen generator filter cartridges is approximately 8000 hours, or the filter cartridges can be replaced according to the pressure difference gauge on the filter group. In an extreme case, if the filter group fails, the air discharged from the air compressor will directly enter the main nitrogen generation unit, causing the carbon molecular sieve or membrane group to be poisoned. In this case, the nitrogen purity will definitely decrease, and it is basically impossible to salvage the situation; the main unit must be replaced or returned to the factory for major repairs.

Key words: Will the purity of a nitrogen generator decrease after being used for a period of time?

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