Service life of pearlescent sand
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Under the condition that the equipment has no internal leaks and the cryogenic box is in good condition, how many years can pearlescent sand be used?
There are no specific requirements for this; it is a consumable item that needs to be checked and replenished on a regular basis. In principle, it doesn’t need to be replaced specifically unless you remove the sand from it.
What was said upstairs is correct, but it’s too idealistic to assume that the equipment doesn’t leak and that the cold box isn’t damaged.
In an ideal situation, it can be understood as not needing to replace everything deliberately, right?
This is generally done in the following way: First, it is determined that there is a leak inside the tower; after removing the sand from the cold box, almost all of it is replaced, as storing it outdoors makes it prone to absorbing moisture from the air； (Prior to now, the factory would discard the frozen blocks, while keeping those that still seemed dry for further use to save money.) Additionally, during regular inspections, additional pearl sand was added as it settled at the bottom of the cold boxes.
In principle, there is no need for replacement, but regular inspections and replenishment are required
There is no leakage inside the cryogenic tank, and a slight positive pressure is maintained (~200 Pa); sand is added regularly, giving it a lifespan that is roughly equivalent to that of air separation equipment~~
Thank you for your answer; I now have a clear idea
However, pay attention to the supply of sealing gas in the cold box to prevent the entry of moist air. If moist air enters, it will have a significant impact on the pearlescent sand. The cooling effect **decreases**.
Well, it is indeed a key point. Fortunately, we are all still paying attention to the cold box pressure