Heatless Air Dryer How does it Works and its Features

Heatless Air Dryer Working Principle

“Heatless Air dryer” often referred as Pressure swing adsorption Dryer. Desiccant dryer, and to a lesser extent Regenerative Dryer. The compressed air is passed through a coalescing type pre filter. 

Here dust particles, water and oil coalesce and removed from the stream. Then the air is passed through a pressure vessel with two “tower” filled with a media such as activated alumina molecular sieve or other desiccant material. 

This desiccant material attracts the water from the compressed air via adsorption. As the water clings to the desiccant the, the desiccant “bed”  become saturated. The dryer is timed to switch towers based on a standard cycle, once this cycle complete some compressed air from the system is used to “purge” the saturated desiccant bed by simply blowing the water that has adhered to the desiccant off. 

 The duty of the desiccant is to bring the pressure dew point of the compressed air to a level in which the water will no longer condense, A standard dew point that is expected by heatless Air dryer is -40°C (-40°F), Required dew point is dependent on application and -70°C is required is some application.

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Main Features are:

Heatless Air Dryer in Thane Mumbai

Heatless Air Dryer in Thane Mumbai

Heatless Air Dryer Manufacturers in Thane Mumbai

Leading Air Compressor manufacturer and solution provider for Refrgerated Air Dryers, Water chillers, Industrial Cooling Application.

Leading Air Compressor manufacturer and solution provider for Water chillers, Industrial Cooling Application. Annair is the best solution when it comes to Air Dryer and Air Compressor Manufacturers in India. Annair Drychill Tech India Pvt Ltd Mumbai is a world class Manufacturer, Exporter and solution provider for compressed air treatment. We are also the best and quality manufacturer of Heatless Air dryer and Refrigerated Air Dryer in India. Annair Drychill Tech India Pvt Ltd is the part of ‘Thalakott’ group which is established in the year of 2005 with Annair as a first organization. One of the trusted brand in India since 2005 with more than 5000 successful installations and satisfied clients.

Our products being exported regularly to South Asia, Middle East, Africa, Europe & South America.

Silver Line Series ( 5 CFM - 70 CFM)

These dryers are used for instrumentation and process applications as well. Some applications are , CNC machines , CMM machines , Spray painting , Nitrogen generators , laboratory air & gas applications , powder coating, etc….

 Main Features are

1.     Dew point achieved - 40˚C.
2.     compact and can be mounted on wall.
3.     Low power consumption.
4.     Light weight Aluminum construction, no rusting.
5.     Specially graded desiccants for optimum performance.
6.     Equipped with pre filter & internal post filter.
7.     Quality as per ISO 8573.1 class 3.
8.     Range from 5 CFM to 100 CFM.

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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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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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What is Air Dryer ?

Air dryer

In simple word Air dryer is a machine, device, or a type of equipment which is used as Industrial as well as a Residential/Home Applications, to remove moisture (forced, dry or hot) from compressed air. Most commonly, Air dryers are used in industrial application in many industries like Hospital, Textile, and Telecom Industries etc. Air dryer process concentrates atmospheric contaminants, including water vapor. Nowadays equipment's are very costly and Air dryers prevent them from rusting and corrosion, which can be caused by unnecessary moisture. It also prevent from the rid of moisture which can affect the attachments, color and the finish of coats and paints. Air dryer works by cooling a warm and moisture full air by 3 degree and separate air and moisture, than through water-trap separated water removed.

TYPES

1.     Refrigerant

2.     Regenerative desiccant

3.     Single Tower

4.     Membrane

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Annair Drychill Tech India Pvt. Ltd. Mumbai Manufacture Company Unit No. 101, I Wing, Plot - K1, Udyog Bhavan-2, Additional M.I.D.C, Anandnagar, Ambernath East, Thane- 421506, Maharashtra, India.

 Request a Quote for Annair Drychill Tech India Pvt. Ltd. Mumbai

Mail Us: sales@annair.com

Call US: 9320950116/ + (91)-251 2620660

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 Desiccant Air Dryers

Heatless Desiccant Air Dryer Manufacturers

What is HeatlessDesiccant Air Dryers?

Heatless Desiccant Dryer is also called as Regenerative Desiccant Dryers, Twin Tower Dryer and lesser extent adsorption dryer these dryer provide simplest way to clean a factory by drying compressed air. Heatless desiccant dryer are extremely reliable with very low maintenance and also have few moving parts. In Desiccant air dryer compressed air pass through a twin tower pressure vessels which is filled with desiccant material such as silica gel, activated alumina, or molecular sieve.

Heatless dryer installed with generally a small footprint or we can say it take less space of valuable factory floor. There is no need for constant supervision in heatless desiccant dryers because it doesn’t need replacement for approximately 5 years. Heatless Air dryer is also known as twin tower dryer and both tower work separately like while first tower is in use then the second tower purge air to regenerate and the biggest cost of installing these dryers is this purge air accounts for approximately 15% of the processed air.

HeatlessAir dryers are ideally suited for moisture sensitive applications and also used for instrumentation and process applications as well such as CNC & CMM machines, spray painting, laboratory air & gas applications, Nitrogen generators, powder coating, etc…. Heatless regenerative produce pressure dew points as low as -40°F with optional features like adjustable cycle timer, solid state controls,  switching failure alarm , active tower lights  and purge saver control increases efficiency at reduced flows and adapted users requirement.  

Types of Heatless Air Dryer

Heatless (no internal or external heaters): There are no internal or external heaters are used in heatless regenerative desiccant type. It can range up to 18% Purge air requirement from the total air-flow also it has a pressure dew point which is -40°F but can be obtained dew points down to -100°F.

Heated (internal or external heaters): In this type the amount of purge air is approximately 5-10 % of the total air flow and purge air is heated to a high temperature and after that it passes through the desiccant bed.

Role and Features

·         Dew point achieved - 40˚C

·         Compact and can be mounted on wall

·         Low power consumption

·         Lightweight Aluminum construction, no rusting

·         Specially graded desiccants for optimum performance

·         Equipped with pre filter & internal post filter

·         Quality as per ISO 8573.1 class 3

·         Range from 5 CFM to 100 CFM

Heatless Air Dryer

•  Silver Line Series (5CFM - 70CFM)

• Heatless Air Dryer - Gold Line Series (100CFM - 1000CFM)

Annair Drychill Tech (I) Pvt, Ltd Mumbai Manufacture Company Unit No. 101, I Wing, Plot - K1, Udyog Bhavan-2, Additional M.I.D.C, Anandnagar, Ambernath East, Thane- 421506, Maharashtra, India. Undoubtedly it is one of the best Manufacturer Company in Mumbai.

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 We are identified as one of the world class Air Dryer Manufacturers. Refrigerated Air Dryer System provided by us is extremely effective to purify impure compressed air that contains dust, oil, and moisture. Refrigerated Air Dryer Refrigerated Air Dryer Manufacturer Water Chiller India Water Chiller Water Chiller Manufacturers Refrigerated Air Dryer in Thane Air Dryer Manufacturer in India Air Dryer Manufacturer Air Dryer in India Air Dryer India Air Dryer Compressed Air Dryers Compressed Air Dryer Compressed Air Dryer Manufacturer Gold star series Air Dryer Compressed Air Dryer In Mumbai Air Compressor Manufacturers Air Compressor Manufacturer Air Compressor Manufacturer in india Auto Drain Valve Auto Drain Valve Suppliers Automatic Drain Valves Manufacturers Micro filters Micro filters Manufacturers Heatless Air dryer Heatless Desiccant Air dryer Heatless Air dryer Manufacturers Desiccant Air Dryer Manufacturers Heatless Air dryer in mumbai Moisture Separator Moisture Separator Manufacturers Moisture Separator in mumbai

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