Does the laboratory liquid nitrogen machine molecular sieve need to be replaced?

　　The application of carbon molecular sieves in nitrogen generation systems is also very important, but few users realize that the carbon molecular sieves in nitrogen generation systems are a very important component. We often hear feedback from users.Laboratory liquid nitrogen generatorUnder what circumstances should the carbon molecular sieve of the device be replaced due to failure? So, let's find out if the molecular sieve of the laboratory liquid nitrogen generator needs to be replaced!

　　Laboratory liquid nitrogen generatorAnalysis of the reasons for carbon molecular sieve replacement

　　1. Aging phenomenon

　　The service life of the carbon molecular sieve in the laboratory liquid nitrogen generator decreases by 5% of its production capacity annually. (Inevitable in the case of carbon molecular sieve aging) If the nitrogen generator is used for too long, the quality of the carbon molecular sieve deteriorates, the purity of the nitrogen produced decreases, and the carbon molecular sieve needs to be replaced to restore the purity. Many customers have reported that after years of use, the nitrogen generator produces insufficient gas, the purity decreases, and the purity cannot be reached.

　　2. Adding oil or water to the laboratory liquid nitrogen generator

　　During the use of the carbon molecular sieve in the laboratory liquid nitrogen generator, improper operation and maintenance can lead to poisoning. For example, due to the lack of pre-treatment equipment for air purification or the malfunction of auxiliary equipment, oil and water impurities, together with air, directly enter the adsorption tower and are adsorbed by the carbon molecular sieve, causing poisoning. The analysis capability is significantly impaired, and the nitrogen generation amount and purity are significantly reduced.

　　Carbon molecular sieve poisoning in the nitrogen generator refers to the manufacturer's failure to timely maintain the air oil removal system, resulting in oil stains entering the adsorption tower inside the nitrogen generator. The oil stains block the adsorption cavity of the carbon molecular sieve, making it unable to adsorb oxygen molecules and leading to reduced output flow. Currently, employers must, according to production needs, timely replace air filters, automatic drain valves, and oil removal activated carbon, primarily replacing the nitrogen generator adsorbent, to restore normal nitrogen generation capacity.

　　3. Pulverization and ejection of carbon molecular sieve

　　Different tightening mechanisms of the laboratory liquid nitrogen generator, including existing cylinder tightening, spring tightening, airbag tightening, and tightening cylinders can be monitored in real time, but future additions will damage the pulverizability of the carbon molecules, causing black smoke to appear in the nitrogen generator. In this case, it is necessary to completely replace the carbon molecular sieve in the entire system. If the carbon molecular sieve is added normally at this time, the carbon molecular sieve will continuously eject, and the consequences will become increasingly serious, with carbon molecular sieve powder from the nitrogen generator throughout the nitrogen gas pipeline system.

　　4. Systemic structural damage

　　Due to detachment of pipes, etc., in the laboratory liquid nitrogen generator, the carbon molecular sieve of the nitrogen generator is damaged. This requires an airtight check of the adsorption tower structure of the nitrogen generator to locate the detachment and replace the new carbon molecular sieve. During the use of the nitrogen generator, due to vibration, equipment movement, etc., structural faults in the adsorption tower, such as detachment of the adsorption tower pipes, outflow of the carbon molecular sieve, and loosening and pulverization of the carbon molecular sieve.

　　After the nitrogen gas production system stops, it needs to be replaced and installed immediately by an experienced nitrogen generator carbon molecular sieve replacement manufacturer. Our company briefly introduces the replacement steps and precautions for the nitrogen generator carbon molecular sieve:

　　1. First, stop the compressed air supply, unload the internal pressure of the nitrogen generation system until all pressure gauges read zero, and turn off the system power;

　　2. When the nitrogen gas outlet pipe is connected to the top of the adsorption tower, the nitrogen gas outlet pipe must be separated, and then the adsorption tower top cover must be removed one by one;

　　3. Clean the carbon molecular sieve in the packing tower filled with carbon molecular sieve;

　　4. Check if the wire mesh and brown bear in the packing tower are damaged;

　　5. After checking that there are no residues in the packing tower packing, prepare for filling;

　　6. Lay a brown mat on the floor, then lay 5 cm of activated alumina, and start filling the carbon crystal sieve;

　　7. Fill the top, vibrate the adsorption tower with a hammer or vibrating tool, confirm that the carbon molecular sieve is firmly filled, and then fill the carbon molecular sieve by at least 5-10 cm to improve the packing cover;

　　8. After filling, Reset all equipment and parameters.

　　The above is an introduction toLaboratory liquid nitrogen generatorWhether the molecular sieve needs to be replaced. For more information, please Contact Us!