MOLECULAR SIEVE HEAT REGENERATION
MOLECULAR SIEVE HEAT REGENERATION
(OP)
I am designing a furnace for MS regeneration, what is intended is to eliminate sorbed water by means of a hot air or nitrogen stream. MS are used in oxygen enriching devices (PSA systems).Would like to know about tips and facts about of someone who walked this way before me. Gas temperature, and humidity measure in the hot gas are worrying me.Thanks





RE: MOLECULAR SIEVE HEAT REGENERATION
We did not actually attempt to measure the water content of the regen gas leaving the bed (the moisture probe was blocked in as hot gas destroyed it). During the heat up cycle, the outlet temperature will show a small plateau (in our case) as adsorbed hydrocarbons came off the MS. There was a much longer plateau later as adsorbed water came off. Once the bulk of the adsorbed water came off, the outlet temperature would continue to rise and approach the inlet temperature.
RE: MOLECULAR SIEVE HEAT REGENERATION
The total duty should equal the heat for heating the steel of the vessel + losses + sensible heat to bring the water to about boiling temp + heat of desorption. Heat Of desorption in MS could be ~4200KJ/kg. Typical outlet temp should be about 270- 290 degC for 4A/5A.
The overall equation is mCpdelT, where m is regen gas flow, Cp is sp heat of regen gas, deT is th temp diff of regen gas between initial and final temp.
The furnace would typically have some efficiency, so use this to estimate the final furnace heat duty.
RE: MOLECULAR SIEVE HEAT REGENERATION
why u need a furnace to supply regeneration duty ..most mol sieves are regenerated using steam heaters or electric heaters ...unless u have some waste heat recovery potential ..
what type of mol seives u have ...do u need a preload step after regeneration ( safety related step ) ,,,what is maximum temperature ur regen gas can have ,,,what is normal direction for adsorption versus ur plan for regen operation ..what is allowed back pressure for regeneration operation ,,,is your control system adequate ?
i think u should go carefully through this and other considerations before trying to just provide a hot enough regen gas ...
the vendor should be of great help to u ...
regards ..
RE: MOLECULAR SIEVE HEAT REGENERATION
The regenerated MS needs to be repoured on small cilinders.
I am working now on how to obtain a "humidity zero room" to perform this operation into.
RGDS
mmo
RE: MOLECULAR SIEVE HEAT REGENERATION