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Regenerative Desiccant Dryers (view source)

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[[File:Regenerative_Desiccant_Dryers.jpg|thumb|200px|right|Regenerative Desiccant Dryers]]
[[File:Regenerative_Desiccant_Dryer_Principle.jpg|thumb|200px|right|Regenerative Desiccant Dryer Principle]]
The '''Regenerative Desiccant Dryers''' are used for drying air in storage tanks  or pneumatic systems and are beneficial in the drying of hygroscopic  (water-absorbing) resins. These dryers remove water from the air by  passing it through a desiccant that absorbs moisture.
The '''Regenerative Desiccant Dryers''' are used for drying air in storage tanks  or pneumatic systems and are beneficial in the drying of hygroscopic  (water-absorbing) resins. These dryers remove water from the air by  passing it through a desiccant that absorbs moisture.


==Features==
==Features==
The Regenerative Desiccant Dryers consist mainly of two cylinders containing desiccant, connected by a valve system.
The Regenerative Desiccant Dryers consist mainly of two cylinders containing desiccant, connected by a valve system.


==Operation==
==Operation==
When  the desiccant in the first cylinder is saturated, the air flow can be  switched to the cylinder containing the dried desiccant.
When  the desiccant in the first cylinder is saturated, the air flow can be  switched to the cylinder containing the dried desiccant.


==Dessicant Types==
==Dessicant Types==
Common  desiccants are silica gel (an oxide of silica), alumina (aluminum  oxide) and calcium sulfate (the anhydrous form of gypsum).
Common  desiccants are silica gel (an oxide of silica), alumina (aluminum  oxide) and calcium sulfate (the anhydrous form of gypsum).


==Types of Dryers==
==Types of Dryers==
While  manual desiccant dryers exist, many dryers are regenerative desiccant  dryers, as noted in the Plant Services magazine article, "The Economics  of Operating Regenerative Desiccant Dryers," by Noel Corral and Andrew  Sheaffer.
While  manual desiccant dryers exist, many dryers are regenerative desiccant  dryers, as noted in the Plant Services magazine article, "The Economics  of Operating Regenerative Desiccant Dryers," by Noel Corral and Andrew  Sheaffer.


==Most Expensive==
==Most Expensive==
Heatless  regenerative desiccant dryers run a portion of dried compressed air  through the previously utilized cylinder to extract moisture from its  desiccant.
Heatless  regenerative desiccant dryers run a portion of dried compressed air  through the previously utilized cylinder to extract moisture from its  desiccant.


==Least Expensive==
==Least Expensive==
Heated purge  regenerative desiccant air dryers use less air than the heatless variety  in addition to heat, which helps the air carry away more water as it  passes through the saturated desiccant.==Best Compromise==Heated blower  purge regenerative desiccant air dryers use air from outside the dryer  that is heated and sent through the water-saturated desiccant for  drying.
Heated purge  regenerative desiccant air dryers use less air than the heatless variety  in addition to heat, which helps the air carry away more water as it  passes through the saturated desiccant.
 
 
==Best Compromise==
Heated blower  purge regenerative desiccant air dryers use air from outside the dryer  that is heated and sent through the water-saturated desiccant for  drying.
 


==Classification==
==Classification==
There are different types of regenerative desiccant compressed air dryers. These are:
There are different types of regenerative desiccant compressed air dryers. These are:
* Small Heatless Desiccant Air Dryers
* Small Heatless Desiccant Air Dryers
* Large Heatless Desiccant Air Dryers
* Large Heatless Desiccant Air Dryers
* Compact Heatless Desiccant Air Dryers
* Compact Heatless Desiccant Air Dryers
* Mini Heatless Desiccant Air Dryers
* Mini Heatless Desiccant Air Dryers
* DMD Desiccant Modular Dryer
 
* DHL Desiccant Heatless Dryer
* DEX Desiccant Externally Heated Dryer
* DBP Desiccant Regenerative Blower Purge Dryer


==Small Heatless Desiccant Air Dryers==
==Small Heatless Desiccant Air Dryers==
[[File:Hrglam02.jpg|thumb|right|100px|Small Heatless Desiccant Air Dryers]]
Using  Pressure Swing Adsorption (PSA) technology, the Twin Tower Engineering  regenerative air dryers are designed to maximize the efficiency of the  drying process. Ultra-Dry compressed air dew points of -40°F to better  than -100°F can be achieved.
Using  Pressure Swing Adsorption (PSA) technology, the Twin Tower Engineering  regenerative air dryers are designed to maximize the efficiency of the  drying process. Ultra-Dry compressed air dew points of -40°F to better  than -100°F can be achieved.


==Large Heatless Desiccant Air Dryers==
==Large Heatless Desiccant Air Dryers==
Engineered  for long service life and superior protection of your air-operated  equipment and processes. THL series heatless regenerative desiccant  compressed air dryers deliver the peace of mind of high quality, value  and fast delivery.
Engineered  for long service life and superior protection of your air-operated  equipment and processes. THL series heatless regenerative desiccant  compressed air dryers deliver the peace of mind of high quality, value  and fast delivery.


==Compact Heatless Desiccant Air Dryers==
==Compact Heatless Desiccant Air Dryers==
[[File:Vsagroup.gif|thumb|right|100px|Compact Heatless Desiccant Air Dryers]]
Economical  and compact, these heatless desiccant compressed air dryers provide low  dew points to -100°F ADP(atmospheric dew point). This proven  "no-frills" design uses Pressure Swing Adsorption (PSA) technology and  will provide years of trouble-free service.
Economical  and compact, these heatless desiccant compressed air dryers provide low  dew points to -100°F ADP(atmospheric dew point). This proven  "no-frills" design uses Pressure Swing Adsorption (PSA) technology and  will provide years of trouble-free service.


==Mini Heatless Desiccant Air Dryers==
==Mini Heatless Desiccant Air Dryers==
[[File:Mdh_group_174h.jpg|thumb|right|100px|Mini Heatless Desiccant Air Dryers]]
Ultra-small  desiccant compressed air dryers can be used for low-flow applications  or with fractional horsepower air compressors. These units are heatless  regenerative desiccant air dryers designed to produce low dew points.  Extremely small footprint allows for packaging inside equipment cabinets  or at point-of-use.
Ultra-small  desiccant compressed air dryers can be used for low-flow applications  or with fractional horsepower air compressors. These units are heatless  regenerative desiccant air dryers designed to produce low dew points.  Extremely small footprint allows for packaging inside equipment cabinets  or at point-of-use.


==DMD Desiccant Modular Dryer==
[[File:PIC_DMD30_lrg.jpg|thumb|right|100px|DMD Desiccant Modular Dryer]]
The  Sullair DMD series is a lightweight modular desiccant dryer that offers  unsurpassed installation flexibility. This lightweight modular dryer  design brings a whole new concept in compressed air technology offering  total installation flexibility to meet your specific needs. A small  amount of the dried compressed air is used to regenerate the saturated  desiccant bed by expanding air from line pressure to atmospheric  pressure, removing the moisture absorbed by the desiccant material.  Protection is built-in. Extruded aluminum housings that surround the  dryers are fully protected from corrosion.
==DHL Desiccant Heatless Dryer==
[[File:PIC_DHL600_lrg.jpg|thumb|right|100px|DHL Desiccant Heatless Dryer]]
The  dual tower design of the DHL series dryers allows for continuous  absorption of water from compressed air by using a desiccant bed. Drying  is accomplished by passing wet compressed air through the desiccant bed  of one tower where moisture is absorbed. Regeneration of the desiccant  is accomplished without the use of heat. The wet bed is dried by  diverting a small amount of dry air from the outlet at near atmospheric  pressure. The purge flow rate is adjustable to suit the desired dew  point. The dry air flows in a counter direction through the wet bed,  sweeping all the water vapor previously absorbed by the desiccant.
==DEX Desiccant Externally Heated Dryer==
[[File:PIC_DEX400_lrg.jpg|thumb|right|100px|DEX Desiccant Externally Heated Dryer]]
The  dual tower design of the DEX dryers allows for continuous absorption of  water from compressed air by using a desiccant. Drying is accomplished  by passing wet compressed air through the desiccant bed of one of the  towers where moisture is absorbed. Regeneration of the desiccant is  accomplished with the use of a low watt density heater. The heated air  has a greater affinity to absorb moisture. When passed through the  regenerating tower at near ambient pressure, the heated air flows in a  counter direction through the wet bed, removing moisture previously  absorbed by the desiccant.


==DBP Desiccant Regenerative Blower Purge Dryer==
[[File:PIC_DBP1000_lrg.jpg|thumb|right|100px|DBP Desiccant Regenerative Blower Purge Dryer]]
The  dual tower design of the DBP, blower purge dryer, allows for continuous  absorption of water from compressed air by using a desiccant. Drying is  accomplished by passing wet compressed air through the desiccant bed of  one of the towers where moisture is absorbed. Regeneration of the  desiccant is accomplished using a blower to pass ambient air through a  low watt density heater because heated air has a greater affinity to  absorb moisture. When passed through the regenerating tower at near  ambient pressure, the heated air flows through the wet bed, removing  water vapor previously absorbed by the desiccant.
==Video==
==Video==
<youtube>EuOH0slYqbc</youtube>
<youtube>EuOH0slYqbc</youtube>
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