Liquid nitrogen washing of molecular sieves
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How is the molecular sieve switched during initial driving? There’s no need to regenerate any of them.
When starting up the system for the first time, it’s necessary to regenerate both molecular sieves before allowing gas to be introduced. It’s also essential to ensure that the molecular sieves are in good condition before doing so. I’ve seen an accident occur where, at the start of operation, the molecular sieves had been regenerated a month earlier and were under nitrogen protection; however, an increase in water content in the nitrogen system caused the molecular sieves to become saturated with water by the time process gas was introduced. As a result, the molecular sieves were not functioning properly, which led to a lot of time being wasted. Therefore, we must ensure that the molecular sieve is in a well-regenerated state before introducing gas.
Reply to 2# zhaohaiwei: Do you mean that even those just purchased need to be replaced (with two units) to ensure reliability? Then gas guidance is carried out.
Reply to 3# Eagle over Xibei: Yes. Also, make sure that the nitrogen level is within the specified range.
The newly filled molecular sieve also needs to be regenerated and meet the required standards before it can be used.
Reply to 3# Eagle Over Xibei: The molecular sieve is already activated at the time of manufacture, but it absorbs moisture from the air during the loading process; therefore, it needs to be regenerated before operation.
Those that have just been bought also need to be regenerated; and even after they have been regenerated, they will need to be regenerated again after some time passes
During the loading process, the molecular sieve adsorbent absorbs a large amount of moisture; it must be thoroughly regenerated before it can be put into use. Automatic or manual regeneration can be carried out according to the control procedures specific to molecular sieves, and it is essential to ensure that the molecular sieve has been properly regenerated before using it. For well-regenerated molecular sieve adsorbents, they must be protected by purging with dry nitrogen before being put into use, to prevent moisture from the air from entering.
Yes, molecular sieves must be regenerated properly before use; otherwise, accidents can easily occur! Moreover, the valves used in this area are all imported, and they are quite expensive; it is essential to make all necessary preparations before production stops!