How it works:
In traditional low temperature air separation system, water in the air will freeze and separate out at cold temperature and block equipment and pipelines; hydrocarbon (especially acetylene) gather in the air separation device may cause explosion under certain conditions. So before the air enters the low-temperature separation process, these impurities all need to be removed through the air purification system filled with the adsorbent such as molecular sieves and activated aluminal.
Adsorption heat:
Water absorption in the process is physical adsorption, and CO2 condensation heat is generated, so the temperature after the adsorbent is raised.
Regeneration:
Because the adsorbent is solid, its porous adsorption surface area is limited, so it cannot be operated continuously. When the adsorption capacity is saturate, it needs to be regenerated.
Adsorbent:
Activated alumina, molecular sieve, ceramic ball
Activated Alumina: the main effect is the preliminary water absorption, it is adsorb most of the moisture.
Molecular Sieve: deep water and carbon dioxide absorption. It is important to ensure the CO2 adsorption capacity of the molecular sieve, as water and CO2 are coadsorbed in 13X, and CO2 can ice block the device. Therefore, in the deep cold air separation, the CO2 adsorption capacity of 13X is the key factor.
Ceramic Ball: bottom bed for air distribution.