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Molecular Sieve And Very Long Drying Time


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#1 Guest_RobT_*

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Posted 06 May 2011 - 05:09 AM

I'm hoping someone with some experience of heated molecular sieve driers can help me out.

Essentially, I'm using a 2 bed system to dry water from airflow. The intention is to unload one bed while fully loading the other. I'm applying heat to the regenerating bed and regenerating with very dry air (partial pressure <1Pa). All pretty standard. No pressure swing unfortunately; it's all at atmospheric pressure.

Trouble is, I can't seem to purge the regenerating bed in anything like the time it takes to load. I'm actually finding drying times >10x as long as the load cycle. This is with various airflows (up to the flow rate used to load the bed).

I've read about systems that can regenerate in similar time to loading (several minutes). How is this acheived? Is there something major I'm missing?

#2 Art Montemayor

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Posted 07 May 2011 - 02:21 PM


Rob:

Please furnish ALL the basic data:

  • Is this a conceptual design? Or is it an installed and operating adsorption air dryer?
  • If an installed and operating unit, what are all its physical characterisitcs, such as size, adsorber bed size and quantity of mol sieves in each bed, air flow rate on adsorption, regeneration cycle type and regen fluid with max temperatures and pressures of inlet and bed, who designed it and how long has it been in service. What are the temperatures and pressures of the feed, wet air and the regen gas prior to entering the unit.
  • A sketch of the unit showing all the main piping;
  • Do you have designer/fabricator’s instruction manual?
  • If this is a conceptual design project, then furnish all your calculations and scope of work.
Await your reply






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