Molecular sieve regeneration temperature curve
In the molecular sieve regeneration curve, the temperature begins to drop when the pressure is relieved, but the temperature at the beginning of heating should increase slightly, then gradually increase until the heating is over.
When the pressure is first released, some substances adsorbed by the molecular sieve under high pressure will be desorbed. This process needs to absorb heat and the bed temperature will drop.
At the beginning of heating, since the temperature of the regenerated intake air is not high enough and it inevitably contains moisture, it is still an adsorption and exothermic process when passing through the molecular sieve bed, so the temperature will rise slightly.
After the intake air temperature rises, the molecular sieve is in the process of desorption and heat absorption. Part of the heat of the regeneration gas is used to heat the upper molecular sieve, and the other part is absorbed by the molecular sieve desorption, causing the regeneration gas outlet temperature to gradually decrease during the heating stage.
When it drops to the same temperature as the bed, the regeneration gas is no longer a heat carrier, but only plays a role of "washing" the regenerated molecular sieve bed. The heat stored in the upper middle and upper part of the molecular sieve bed during the heating phase is also gradually taken out by the regeneration gas. As the heat penetrates the entire bed, the outlet temperature gradually rises again until the heating regeneration is completed.