To address the diverse requirements for liquid nitrogen usage across various industries and user groups, our company provides personalized, professional small-scale liquid nitrogen equipment designed to fully meet specific operational needs.
These small-scale liquid nitrogen systems operate on the principle of Pressure Swing Adsorption (PSA), utilizing high-quality carbon molecular sieves as the adsorbent to generate nitrogen from the air. Compressed air—having undergone purification and drying—undergoes pressurized adsorption and depressurized desorption within the adsorption vessel. Leveraging kinetic effects—whereby the diffusion rate of oxygen molecules into the micropores of the carbon molecular sieve is significantly higher than that of nitrogen—nitrogen becomes enriched in the gas phase before adsorption equilibrium is reached, thereby yielding the final nitrogen product.
Proper maintenance is essential during the long-term use of small-scale liquid nitrogen equipment to extend its service life. Here are the recommended maintenance procedures:
1、Carbon molecular sieves are the core component of the equipment. To prevent contamination and loss of functionality, strictly control the oil content in the air compressor's discharge and regularly replace the precision filter elements and the activated carbon within the high-efficiency oil remover.
2、If large amounts of black dust are observed blowing out of the muffler exhaust port during operation, shut down the equipment immediately to investigate the cause and prevent further pulverization of the carbon molecular sieves.
3、Regularly check the pressure gauge on the clamping cylinder. If there is no pressure or if the pressure drops during the desorption phase, it indicates that the cylinder is failing to properly clamp the molecular sieves. Troubleshoot and resolve the issue promptly to prevent the sieves from shifting due to inadequate clamping, which could lead to pulverization.
If a "carbon level" alarm triggers due to the settling or normal depletion of the carbon molecular sieve, the unit must be shut down immediately to replenish the material. The storage, transport, and handling of carbon molecular sieves pose no health risks to humans; however, operators should wear safety goggles and respiratory protection and use an exhaust fan during filling, and any skin that comes into contact with the material should be washed thoroughly with soap afterward.
4. In the event of faults such as nitrogen purity alarms, carbon level alarms, or a drop in adsorption pressure, the unit must be shut down immediately to diagnose and rectify the issue.
5. If the equipment is left idle for an extended period or used only intermittently, it should be powered on at least once a month for four hours to ensure it remains in a ready-to-operate state.
6. During continuous operation, regularly inspect all pipe connections for airtightness to ensure there are no leaks. Also, frequently check the operating status of all pneumatic valves and the refrigerated dryer to ensure they are functioning correctly.
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