Regarding

1# From pressure equalization to adsorption, there are three reasons for the increase in the temperature at the molecular sieve outlet. 2# From pressure relief to heating, there is only one reason for the decrease in the temperature at the molecular sieve outlet; those below know this

Reply to 2#: During the 525h pressure equalization process, the pressure at the third outlet stage of the booster decreases first and then increases. When pressure relief occurs, the pressure at this outlet stage keeps decreasing; it rises again when heating starts. What’s going on?

During pressure equalization, the gas flows toward the molecular sieve, which results in less gas reaching the booster pump; as a consequence, the pressure at the final stage decreases. Once pressure equalization is complete, and just before pressure relief occurs, an increase in gas flow causes the pressure of the booster pump to drop. Subsequently, the temperature at the inlet of the booster pump rises, leading to a decrease in its efficiency, and the pressure at the final stage continues to drop. Generally, this pressure returns to normal during pressure relief, while sometimes it is only after heating that the pressure at the final stage increases again.

Reply to 4# 525h: Could you tell us about the specific properties of molecular sieves? In other words, when the molecular sieve switches from parallel adsorption to operation in a single group, a small peak appears within about 20 minutes – that is, it first rises slowly and then falls slowly. This is due to the specific properties of the molecular sieve. How can this be explained?

The outlet temperature rises gradually for three reasons: insufficient cooling, the heat generated during pressure equalization adsorption, and the strong adsorption capacity of the newly regenerated molecular sieve, which results in significant adsorption heat

:) How can one determine that the molecular sieve has absorbed water when there is no carbon dioxide analysis after the purifier?

Check for pressure fluctuations in the molecular sieve, as well as the temperature difference between the outlet and inlet temperatures; this is usually around 4-6 degrees. Additionally, consider the resistance of the plate exchanger, the expander, and the pressure differences in the heat exchangers

If the air contains water, this can be detected through the drain before the molecular sieve; as for water in the heater, refer to the information above

The pressure release of the molecular sieve is considered to be the beginning of regeneration. At the start of this pressure release, due to the change in pressure, some of the molecular sieve is desorbed; this process requires heat absorption, and as a result the temperature of the bed decreases. At the beginning of the heating process, the temperature of the regenerated intake air is not high enough. In fact, the molecular sieve is involved in an adsorption process that releases heat, so the temperature needs to increase slightly further. As the inlet temperature rises, part of the heat in the regenerating gas is used to heat the molecular sieve, while the rest is absorbed by the desorption process carried out by the molecular sieve; as a result, the outlet temperature of the regenerating gas gradually decreases during the heating phase. However, the temperature does not keep dropping; as the analysis progresses and more molecular sieves are analyzed, the amount of adsorption heat required gradually decreases, so the temperature rises again. If there are any mistakes in what I’ve said, please point them out. Regarding the booster pump, if your process is similar to one I’ve seen before, you can think of it this way: with the total volume of air from the air compressor remaining unchanged, the molecular sieve requires more air due to the pressurization process; as a result, the amount of air going to the booster pump decreases, and the pressure drops. Once the pressurization is complete and the air is released, the pressure will naturally rise again

The explanation upstairs was excellent; I completely agree.