Who knows why heatless regeneration isn’t used for molecular sieve dehydration?
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As the title suggests, please have an expert answer this! Thank you!
Which device or process is used? Molecular sieves for regeneration without heat have been in use all along~~
The dehydration and regeneration of molecular sieves generally requires heating
There are also those that use adiabatic regeneration or mild heat regeneration~~
Instrument air is generally dried by pressure swing adsorption.
The choice of regeneration method depends on the requirements regarding the dew point of the air after adsorption. Molecular sieve adsorbers in air separation units require a high dew point; heatless regeneration cannot meet these requirements, and only high-temperature regeneration can ensure stability in the dew point at the outlet of the molecular sieves. If it is instrument air or compressed air for equipment, where low requirements are placed on the dew point and non-thermal regeneration or mild thermal regeneration is sufficient, then high-temperature regeneration will certainly not be used. Saving a little counts!
I believe that drying with dry polluted nitrogen or nitrogen for an extended period can also achieve dehydration; the key is whether such a long time is feasible, and whether the amount of nitrogen used over that period is cost-effective
Most air separation systems are heatless regeneration systems; natural gas purification requires a high water dew point, and heat regeneration is used in most of these cases
The choice between thermal regeneration and non-thermal regeneration for molecular sieve dehydration depends on the requirements regarding dew point at the site. If a low dew point is required, non-thermal regeneration is sufficient; whereas if a high dew point is required, thermal regeneration should be used, as it allows for more thorough regeneration of the molecular sieves