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Heatless Desiccant Dryers

Presenting. Heatless Desiccant Dryers. HHE – HHL – HHS Desiccant Dryer Features. Industrial grade desiccant beads offer enhanced surface area and high crush strength which prolongs bed life

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Heatless Desiccant Dryers

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  1. Presenting. . . Heatless Desiccant Dryers

  2. HHE – HHL – HHS Desiccant Dryer Features • Industrial grade desiccant beads offer enhanced surface area and high crush strength which prolongs bed life • Tower sized so that air velocity through the bed won’t fluidize the desiccant bed, reducing bed movement and dusting • Up-flow drying design allows water and heavy contaminants to drop out as the air enters a tower • Large flow diffusers ensure even flow distribution • Separate fill and drain ports for ease of desiccant replacement

  3. HHE – HHL – HHS Desiccant Dryer Features • Pressure vessels are CRN and ASME Certified • Heavy duty mufflers for quiet operation ( extra muffler core supplied when shipped ) • NEMA 4 / 4X electrical construction is standard • Pressure relief valve standard

  4. Operating pressures and temperatures • Maximum Pressure • 150 psig Standard • 250 psig Optional • Maximum Inlet Temperature • 140 deg F or 60 deg C • Maximum Temperature • 120 deg F or 49 deg C • Minimum Pressure • 60 psig for 150 psig machine • 120 psig for 250 psig machine • Minimum Temperature • 35 deg F or 2 deg C • -20 deg F or –29 deg C ** • ** With low ambient package

  5. Desiccant Fundamentals

  6. Desiccant Beads • 1/8” Activated alumina • Large surface area • High crush strength • Highly abrasive

  7. Adsorption Process Stage 1: Water vapor moves from areas of higher concentration to areas of lower concentration

  8. Adsorption Process Stage 2: Water vapor molecules come in contact with the surface of the bead and are adsorbed

  9. Adsorption Process Stage 3: Water vapor builds up on surfaces, eventually becoming dense enough to change states into a liquid

  10. Adsorption Process Stage 4: Heat is released as water is adsorbed (1250 BTU’s per pound of water)

  11. Adsorption Process Stage 5: The desiccant adsorbs water until the concentration of water vapor equals that of the compressed air stream

  12. Operating Principles • Compressed air passes through a vessel filled with desiccant • Water vapor is captured on the surface of the desiccant by the process called adsorption • Dry air exits the dryer

  13. Inlet & Outlet switching valves automatically shifts to the low pressure side of circuit • Shuttle valve life tested to over 500,000 cycles • Shuttle valve position memory ensures drying continues, even with the loss of electrical power to the dryer

  14. HHE Controller • Solid state controller in polycarbonate box • NEMA 4/4X, IP66 rated • 10 minute fixed time ONLY • Amber tower status lights • 12 volt DC coil voltage

  15. HHL Controller

  16. Filter Maintenance LED Left Tower Pressure Switch LED On = Switch Closed Off = Switch Open Right Tower Pressure Switch LED On = Switch Closed Off = Switch Open Right Tower LED Left Tower Drying LED Left Purge Valve LED On =Valve Open Off =Valve Closed Left Tower Regenerating LED Right Purge Valve LED On = Valve Open Off = Valve Closed Left inlet Valve LED On = Valve Open Off = Valve Closed Right tower Regenerating LED Right Inlet Valve LED On = Valve Open Off = Valve Closed Filter Maintenance LED Operating Cycling LED’s ISO class 1-4 and Manual Cycle (Test Mode) Energy (Purge) Savings LED’s Energy Savings Icon ISO Class Selector Switch Energy Savings Selector Switch Communications Icon Maintenance Reminder LED Reset Switch (Normal Maintenance Reminder & Alarm) Alarm LED Power On LED On/Off switch HHL Controller

  17. HHS Controller

  18. Filter Maintenance LED Left Tower Pressure Switch LED On = Switch Closed Off = Switch Open Right Tower Pressure Switch LED On = Switch Closed Off = Switch Open Left Tower Drying LED Left Purge Valve LED On = Valve Open Off = Valve Closed Right Tower Drying LED Left Tower Regenerating LED Right Purge Valve LED On = Valve Open Off = Valve Closed Right Tower Regenerating LED Left Inlet Valve LED On = Valve Open Off = Valve Closed Right Inlet Valve LED On = Valve Open Off = Valve Closed Filter Maintenance LED “Enter”Switch “Select” Switch Maintenance Reminder LED Communications Icon Reset Switch (For Maintenance Reminder & Alarm) Vacuum Fluorescent Text Display 2 Line x 16 Character Alarm LED Power On LED On/Off switch HHS Controller

  19. ISO 8573.1 Air Quality Classes

  20. 40 – 3000 SCFM Air Flow Schematic • Inlet shuttle valve • Outlet shuttle valve • Muffler • Right Tower Purge -Depressurization Valve • Left Tower Purge- Depressurization Valve

  21. 40 – 3000 SCFM Sequence of Operation • Compressed air flows through inlet shuttle valve (A) to Tower 1 where the air is dried • After the air is dried it flows through outlet shuttle valve (B) and then to the dryer outlet • 15% of the dried air branches off of the outlet, flows through the purge orifice, and then through the adjustable purge rate valve

  22. 40 – 3000 SCFM Sequence of Operation • The purge flow that has been throttled to near atmospheric pressure is directed to tower 2 • When the purge air passes over the desiccant it removes the water vapor that was deposited there when the tower was on line drying • The purge air exits through valve (D) (normally closed) purge/repress valve, then out of the muffler (C) to atmosphere

  23. 40 – 3000 SCFM Sequence of Operation • After time has elapsed valve (D) closes allowing tower 2 to re-pressurize slowly • Adequate time is allowed to fully re-pressurize tower 2 before switch over • After a controlled time period purge/repress valve (E) opens • The inlet and outlet shuttle valves will shift. Tower 2 will • Tower 2 is now drying the main air stream and Tower 1 is being regenerated

  24. 4100 – 5400 SCFM Airflow Schematic Purge check valve Orifice Purge adjust valve Outlet check valve Right Tower Left Tower Muffler Purge Valve Air Inlet Inlet valve

  25. 4100 - 5400 SCFM Sequence of Operation • Air enters through inlet switching valve (Normally Open) UP through the left tower where it is dried • The dry air flows through the outlet check valve and out the dryer outlet • A portion of the dry air (15 percent) branches off from the main air stream before the outlet • The purge air is controlled by the adjustable purge rate valve and goes through the single orifice

  26. 4100 - 5400 SCFM Sequence of Operation • The purge air that is throttled to near atmospheric pressure goes through the purge check valve and DOWN through the right tower • The dry air removes the water vapor that was deposited while the tower was on line drying • The purge air passes through the purge/repress valve (normally closed) and out through the muffler to atmosphere

  27. 4100 - 5400 SCFM Sequence of Operation • After time has allotted the purge/repress valve closes allowing the right tower to re-pressurize slowly • Adequate re-pressurization time is allowed so the the tower is fully pressurized before switchover

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