Does the perlite in the air separation cryogenic tank need to be replaced regularly?

Pearlescent sand generally does not need to be replaced, as settlement occurs over time as the equipment operates; it only needs to be replenished from time to time. There are usually two situations in which replacement is necessary: one is when its service life has expired； First, the pearlescent sand becomes damp, leading to issues such as caking that do not meet the process requirements.

What is the service life of pearlescent sand? Are there any standards?

Can insulation be filled directly with pearlescent sand?

Pearlescent sand can only be used for filling, not for wrapping, right? ?

Make a thermal insulation chamber and fill it directly with pearlescent sand!

So it’s to create a thermal insulation module, with pearlescent sand inside? ? ?

As a filler-type insulation material, there are usually no strict regulations regarding its replacement. Regarding air separation towers, to determine whether replacement is necessary, one must first assess the degree of cooling loss in the cryogenic tank, ruling out the possibility of leaks. Extensive frosting appears on the surface of the cold box, usually on the top. There are two factors: first, long-term vibration causes it to become pulverized and settle, resulting in cold loss as the equipment inside the tower top cold box is exposed without proper insulation. Secondly, the top of the tower may not be properly sealed, or the sealing pressure in the cold box may be too low or non-existent, allowing moist air to enter the cold box or causing leaks. Pearl sand has an extremely high moisture absorption capacity, and its thermal conductivity increases after absorbing moisture, which leads to heat loss. If the impact of these two factors on production is significant, considering a comprehensive on-site assessment, planning to replace the pearlescent sand may be advisable. The replacement is usually partial; only the frozen section needs to be replaced. If severe powdering or significant heat loss is detected when the components are placed under the cold box, it is necessary to consider replacing them all. It is important to make a comprehensive assessment; do not mistake the device’s own leakage for the \"aging\" of the perlite, as this could lead to waste. This task enables the prediction of its usage during major tower overhauls. For reference.

No replacement is required; only regular checks are needed to ensure there are no leaks, that the pearlescent sand inside the cold box has not settled, and that the panels are not frosted over. If the pearlescent sand sinks severely inside the cold box, it is necessary to replenish it!