Showing posts with label heatless air dryer manufacturers in india. Show all posts
Showing posts with label heatless air dryer manufacturers in india. Show all posts

Monday, 22 April 2019

Regenerative desiccant Air Dryer – (Heated & Heatless)

Desiccant Air Dryer

Air Dryers are used for removing water vapor from compressed air and now they are commonly found in a huge range in commercial and industrial areas. Today in this article we are going to talk about regenerative desiccant Air dryer.

Regenerative desiccant Air dryer or “Heatless Air Dryer” or “Twin tower Air dryer” are used to remove all the water or vapor from compressed air at very low dew point. Regenerative desiccant Air dryer contain a special material known as desiccant (hygroscopic dry agent) which helps to absorb the moisture from compressed air. 
Through a refrigerated Air dryer a compressed air application can filter the proper and require air quality but when compressed air application getting exposed to freezing temperature then it is Regenerative desiccant Air dryer which maintain dew point, save energy and through its desiccant medium remove moisture from the compressed air when a wet air pass through the desiccant medium, which then adsorbs the moisture. Desiccant medium can absorb finite capacity of moisture before it dried out, or regenerated. Desiccant dryers generally construct in twin-tower structure, each tower contain its own desiccant bed because one bed is used to dry compressed air as the second process the undergoes regeneration.

 Advantages of Regenerative Desiccant Type Dryers include:
1.    Regenerative Desiccant can achieve very low dew point without freeze-up.
2.     Regenerative Desiccant maintains the level of purge air.
3.     Regenerative Desiccant is designed to operate pneumatically for remote, hazardous, or mobile work sites.
4.     Regenerative Desiccant filter a compressed air down to-40oC (-40oF).
5.     Regenerative Desiccant maintain the pressure dew point of -70oC (-100oF).
6.     Regenerative Desiccant doesn’t require electrical power for operation.

Types of Regenerative desiccant Air Dryer
1.     Heatless (no internal or external heaters)
2.     Heated (internal or external heaters)

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Monday, 14 January 2019

Heatless Desiccant Dryers Overview

Heatless Desiccant Dryer

The Working Principle - Flow Direction

Wet air from the compressor flows UP the tower. This means that gravity will encourage the water, already collected from the air, down the tower and away from the dry desiccant. More water exists at the bottom of the tower than at the top.

A small amount of the dried air, is feed through the purge line DOWNWARDS through the “wet” tower. Water is concentrated at the bottom of the tower due to the direction of the wet air.

The downward direction of the purge air means that the bulk of the water in the tower does not have to pass through the bulk of the desiccant. The moisture only has to travel a short distance before it’s ejected.

Performance Recalculation - A Question

Why is it that you cannot up rate the dryer for inlet temperature below 35°C ?

The Answer:

  • You cannot push more than the nominal flow through the dryer because the pressure drop increases dramatically.
  • Additionally, the speed of the air increases, meaning that the air is in contact with the desiccant for less time, which results in less effective drying and an increased PDP
  • The additional air speed also disrupts the desiccant bead and causes “channels” to be formed - resulting in less effective drying. The extra friction also reduces the desiccant lifetime.
  • Up-rating the dryer for a lower inlet temperature means that after 3 minutes the desiccant bed is saturated as normal. However, the purge air is also cooler than normal, meaning that it has less capacity to hold water. The purge flow (nozzle) is sized based on a purge air temp of 35°C, meaning that if the temperature of the air is only 30°C, it will not have the capacity to dry the desiccant bed. 

Heatless Desiccant Dryer :

Choice Of Desiccant 

Why Use Different Desiccant ?

Different desiccants have different levels of water attraction
The greater the attraction, the better pressure dew point is possible, but the more purge is needed to regenerate the desiccant.
Most desiccant cannot provide a -70°C PDP
Desiccant that can provide a -70°C PDP is more expensive
We don’t want the customer to pay for something that’s not needed

What Desiccant Do We Use in Heatless Desiccant Dryers? 

For PDP’s of -20 to -40°C PDP Activated Alumina
For PDP’s of -70°C PDP Molecular Sieve
We balance performance with capital investment and ongoing running cost through purge air
For smallest dryers Molecular Sieve is used as due to small amount of desiccant the cost of it is not critical.


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Monday, 1 October 2018

heatless air dryer working principle

Heatless air dryer working principle

Heatless Desiccant dryer

All about heatless air dryers

A majority of the Industrial Compressed Air Systems and different other applications of air dryers involve the use of Heatless Compressed Air  systems. High Pressure Gas and Air Drying Systems also involve the use of these compressed air dryers in many of their applications. Annair DryChill Tech india Pvt Ltd. in heatless air dryer manufacturing.

How heatless air dryer it functions?

The simplest form of a desiccant kind of air dryer is the heatless compressed one. It can achieve a dew-point of -40°C for the compressed air systems as well as the other applications of air dryers. After passing through the pre-filter, the wet incoming compressed air passes thorugh the assembly of the slide piston. Next, this air is directed towards the first chamber where in it travels upwards through the desiccant bed consisting of activated alumina or molecular sieves. This causes it to dry up due to the adsorption effect of the bed. The dry compressed air coming out of the first chamber now travels through the assembly of check valves hence paving its way through the alter-filter and thereby to the area of application or work. The desiccant in the second chamber that had been wetted in the previous cycle regenerates simultaneously as the compressed air dries in the first chamber. The purge valve depressurizes the second chamber down to the atmospheric pressure in the downward direction. Meanwhile, a portion of the dry compressed air flushes the desorbed moisture out by passing through the needle valve or orifice plate through the desiccant. The purge valve closes and the tower slowly re-pressurizes to line pressure ensuring a smooth changeover as the regeneration completes. An effective dewpoint of -40°C or even better is obtained at atmospheric pressure with an additional period of 5 minutes for drying. An approximate of 60 seconds is all the re-pressurization takes in the regeneration process. This is the principle involved in heatless air dryer manufacturing.

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Heatless Air Dryer
Air Dryer Manufacturer
Air Dryer
Compressed Air Dryer Manufacturers

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