Difference between revisions of "Twin Tower Dryers"

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[[File:Twin_Tower_Dryers.jpg|thumb|200px|right|Twin Tower Dryers]]
[[File:Twin_Tower_Dryers_Principle.jpg|thumb|200px|right|Twin Tower Dryer Principle]]
The '''Twin Tower 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 '''Twin Tower 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 Twin Tower Dryers consist mainly of two cylinders containing desiccant, connected by a valve system.
The Twin Tower 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 Twin Tower Dryers, as noted in the Plant Services magazine article, "The Economics  of Operating Twin Tower Dryers," by Noel Corral and Andrew  Sheaffer.
While  manual desiccant dryers exist, many dryers are Twin Tower Dryers.
 


==Most Expensive==
==Most Expensive==
Heatless Twin Tower Dryers run a portion of dried compressed air through the previously utilized cylinder to extract moisture from its desiccant.
Heatless Twin Tower 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 Twin Tower 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 Twin Tower 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 Twin Tower Dryers use air from outside the dryer  that is heated and sent through the water-saturated desiccant for  drying.
 


==Classification==
==Classification==
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* Compact Heatless Twin Tower Dryer
* Compact Heatless Twin Tower Dryer
* Mini Heatless Twin Tower Dryer
* Mini Heatless Twin Tower Dryer
* DMD Desiccant Modular Dryer
* DHL Desiccant Heatless Dryer
* DEX Desiccant Externally Heated Dryer
* DBP Desiccant Regenerative Blower Purge Dryer
==Small Heatless Desiccant Air Dryers==
[[File:Hrglam02.jpg|thumb|right|100px|Small Heatless Twin Tower Dryer]]
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==
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==
[[File:Vsagroup.gif|thumb|right|100px|Compact Heatless Twin Tower Dryer]]
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==
[[File:Mdh_group_174h.jpg|thumb|right|100px|Mini Heatless Twin Tower Dryer]]
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 Twin Tower 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 Twin Tower 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 Twin Tower 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.

Latest revision as of 04:58, 2 August 2012


Twin Tower Dryers
Twin Tower Dryer Principle

The Twin Tower 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

The Twin Tower Dryers consist mainly of two cylinders containing desiccant, connected by a valve system.


Operation

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


Dessicant Types

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


Types of Dryers

While manual desiccant dryers exist, many dryers are Twin Tower Dryers.


Most Expensive

Heatless Twin Tower Dryers run a portion of dried compressed air through the previously utilized cylinder to extract moisture from its desiccant.


Least Expensive

Heated purge Twin Tower 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 Twin Tower Dryers use air from outside the dryer that is heated and sent through the water-saturated desiccant for drying.


Classification

There are different types of Twin Tower Dryers. These are:

  • Small Heatless Twin Tower Dryer
  • Large Heatless Twin Tower Dryer
  • Compact Heatless Twin Tower Dryer
  • Mini Heatless Twin Tower Dryer
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