The cold blow peak is normal, but carbon dioxide levels are above the limit
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The cold-blow peak is normal, but two hours before the end of adsorption when it was time to switch over, carbon dioxide levels started to rise, reaching a maximum of 4 ppm. I wondered whether to bring water along, with the heating temperature set at 260 and the cold blow peak at 180. It’s all useless. What is the reason for this? If the bed layer is uneven, two peaks will appear, but none were observed here, so it seems that the problem isn’t with the bed layer. Is it possible that there’s a shortage of molecular sieves, but how did it appear suddenly? Another molecular sieve is working properly
There may be two possible reasons: one is the deactivation of the adsorbent, and the other is an excessive amount of adsorption. If the adsorbent becomes deactivated, it indicates that there is not enough molecular sieve and it needs to be replaced. If the adsorption capacity is too high, it is necessary to increase the cold blowing time or the amount of molecular sieve used. Before determining the specific cause, it is recommended to conduct further inspections and tests to rule out other possibilities, such as checking whether the bed layer is level and examining the carbon dioxide concentration in the air. Ultimately, appropriate solutions can be adopted based on the actual situation. .
Is the deactivation of the adsorbent instantaneous? Because everything was fine before, and the carbon dioxide levels were stable as well; it was only suddenly that this situation arose. If the bed layer is not level, two cold-blow peaks should appear, but there are none here either