Compressed Air Dryer,Industrial Compressed Air Dryer,Heatless Air Dryer,Refrigerated Air Dryers,India

Showcase
Play now

Compressed Air Dryers

Why Dry Air ?

Compressed air is used in industries for various applications in pneumatic tools, pneumatic instruments, pneumatic machines and in a variety of production processes. The consequences of using wet air are rust and scale deposits in steel pipes, increased resistance in flow, malfunctioning of process control instruments, corrosion and damage to electromagnetic valves and pneumatic system, peeling and blistering effect on spray painted surface etc. Thus it will affect the quality of product and lead to excessive maintenance cost.

Ideal compressed Air System:

Air from the compressor has excessive moisture and contaminants. The sketch below shows a typical Compressed air system to remove these damaging impurities and get Clean and Dry air. When compressed to 7Kg/cm2g the temperature of discharge air reaches around 140oC. The after cooler and Separator installed after the compressor will cool the air, and removes 90% of moisture and oil. For instance, when the compressor takes in 100 NM3/hr of ambient air at 40oC and 50% relative humidity, at 7Kg/cm2g the after cooler will condense an average of 30 liters of water in 24 hours. If the outlet air temperature from the after cooler is 40oC, it still contains 8000 ppm moisture. At 45o C compressed air contains 10,500 ppm, at 50oC, 13,500 ppm moisture which is removed by Air Dryer. Therefore, lower the temperature of air at dryer inlet, smaller would be the size of Air Drying Unit.

Product Description

At, SAM Gas Projects (P) Ltd, we manufacture a wide range of compressed air dryers, which are great in demand in domestic and international market. Few of them are listed below for your reference:

Heatless Type
Heat of Compression (HOC) Type
Internal Heat Reaction Type
No Purge Loss Type

Application of Compressed Air Dryers

The compressed air dryers based on PSA technology has a broad range of commercial applications. They are the following:

Replace Bottle Nitrogen.
Lasers.
Air Bearings.
Thermal Test Equipment.
Dry Boxes.
Purge Electrical Boxes.
Pneumatic Instrumentation.

Request a Quote

Heatless Type Air Dryers

A Heatless compressed air dryer ( drier ) is the simplest form of dessicant type gas or air dryer ( drier ) for achieving a dew point of -40°C or better for compressed air systems and other gas and air dryer ( drier ) applications .

PROCESS - Wet incoming Compressed air after passing through pre filter passes through the slide piston valve assembly and is directed towards adsorber chamber I where the compressed air passes upward through the desiccant ( Activated Alumina / Molecular Sieves ). Compressed Air drying takes place by adsorption. Dry Compressed air from adsorber chamber I then passes through the Check valve assembly and then through the after- filter to the application or work area.

While Compressed air is being drying in chamber I the dessiccant in chamber II where the desiccant has been wetted in the previous cycle is being simultaneously regenerated. The chamber II is depressurized to atmosphere through the purge valve in the downward direction. A portion of the dry compressed air passes through the needle valve / orifice plate through the desiccant and flushes out the desorbed moisture.

When the regeneration is complete, the purge valve is closed and the tower is slowly repressurised to line pressure for a smooth changeover. A drying period of 5 minutes provides an efficient dew point of -40°C or better (at atmospheric pressure ). In regeneration process approximately 30 seconds are required for repressurisation.

Request a Quote

Heat Reactivated Type Air Dryers

Heat Reactivated dryers are used when one needs compressed air of very low Dew point of (-)60oC or (-)80o Deg C. In this design, the desiccant is regenerated at higher temperature, along with small quantity of Dry air purge. Due to purging with Dry air and thermal regeneration, residual moisture loading on desiccant becomes low and this gives very low Dew point.

The Drying unit has 2-vessels filled with Activated Alumina or Molecular sieves desiccant. One vessel remains in drying cycle for 4 hours, while other vessel is simultaneously regenerated at atmospheric pressure. Around 3% flow of dryer capacity is used as purge for regeneration. Electrical heaters are provided in a central finned Stainless steel pipe in both drying vessels. Heating cycle is for 2 hours and in this time hot purge air increases desiccant temperature to around 100oC. At this temperature regeneration is complete (due to dry air purge). Dew point achieved is around (-)40oC. If still lower Dew point is required, air purging rate is slightly increased to 5% for (-)60oC and to 7.5% for (-)80oC Dew point.

SAM Gas Filters

A Pre-filter with automatic drain valve is provided to remove any physical moisture from compressed air before entering Air dryer. A micronic filter is also provided in the Dryer outlet to arrest any desiccant dust particles, up to 1 micron size. Thus, you get absolutely “Clean & dry compressed air”.

SAM Gas Salient Features

A fully Automatic unit requiring no attention of the operator. Heaters switch ON/ off and all valves operate automatically.
Pressure is equalized to line pressure before changeover of drying vessels. This prevents pressure and flow surge, and, desiccant dusting
Low purge air requirement in comparison to Heatless type dryer.
Desiccant life is around 5 years.
Internal heaters provide maximum heat transfer efficiency resulting in lower power requirement.
Counter current heated dry purge air provides maximum removal of moisture with minimum gas purge loss.
Heaters are not in physical contact with the desiccant.
Standard units are designed to deliver dry gas / air of (-)40deg C Dew Point. By using more purge airflow, and using Molecular sieves, Dew point of (-) 80deg C can be achieved.

Air capacity	5 to 3000 NM3/ Hr.
Dew point	(-)40oC to (-)80oC.
Operating pressure	2 to 50 kg/ cm2g.

Request a Quote

Heat Of Compression Type Air Dryers

In this type Compressed air, directly from Air compressor discharge is taken to Air dryer inlet through insulated pipelines, at 120 deg C(minimum) temperature. This hot air is passed through one drying vessel where saturated desiccant is regenerated by this hot air. After picking up moisture from desiccant bed, the air is cooled in an intermediate cooler. Here moisture is condensed and removed by auto drain valve. Cooled to 40oC, this air passes through the second drying vessel where balance moisture gets adsorbed and Dry air comes out. Cycle time is 4 hours regeneration & 4 hours drying. After 4 hours the changeover of vessels takes place automatically. In regeneration cycle heating of the bed is only 2 hours, and thereafter the bed is cooled by Dry air. After bed cooling, Dry air is again cooled to 40oC in another cooler, and delivered out of unit as Dry air at 40deg C temp.

The Dryer is fully automatic with pneumatically actuated Ball/ plug valves. A sequence timer controls operation of these valves. Desiccant used is Activated Alumina and it dries the air upto (-)40deg C Dew point.

SAM Gas Salient Features

No power requirement for regeneration.
No loss of compressed air.
Maintenance is easy as there are no Blower, no Heaters, and no moving parts.
Maintains desiccant adsorption capacity to give (-)400C Dew point for almost 5 years.
Low-pressure drop across the Dryer- less than 0.3kg/cm2.
Skid mounted construction on channel base frame.
Fully Automatic, continuous operation.
Negligible operating cost. It neither requires Electric power for regeneration, nor there is any loss of compressed air

Air capacity	500 to 6000 NM3/Hr.
Dew Point	up to (-)40oC.

Request a Quote

Regenerated Type Air Dryers

In small Air capacities upto 500 NM3/hr we offer Model-SP. It's simple and very compact design consisting of a cylindrical heat exchanger with freon tubes. Air flows outside the tubes and gets cooled to 3°C temperature. Moisture condenses out and is drained continuously. The out going air is at 3°C temperature with (+) 3°C Pressure Dew Point which is equivalent to approx (-) 23°C dew point at atmospheric pressure.

For larger Ah capacities, above 500 NM3/hr, we recommend Model -AA. It is a skid mounted unit consisting of Air-Freon chiller, Air to Air pre-Cooler and a moisture separator. First air is precooled with outgoing chilled air to around 25°C and then it is cooled in a freon cooler to {+) 3°C temperature. This reduces refrigeration load of the Unit. Outgoing dry air has (+) 3°C Pressure Dew Point and comes out at around 25°C temperature. (+) 3°C Dew Point in Refrigerated Air Dryers corresponds to around (-) 23°C Atmospheric Pressure Dew Point. Still lower Dew Point ls not possible from Refrigerated Dryer as moisture condensed would start freezing on freon tubes if lower dew points are tried.
(-) 23°C is the best possible Dew Point achievable from Refrigerated Air Dryers.

Request a Quote

No Purge Loss Type Air Dryers

In this design there is NO LOSS of compressed air. Time cycle is 4+4 hours with (-) drying towers filled with SILICA GEL desiccant. For regeneration, a centrifugal air blower and an electrical heater is provided. Desiccant is heated upto 200degC by hot air for complete regeneration. These dryers are bulky in size and the power consumption is almost double as compared to "INTERNALLY HEAT REACTIVATED TYPE DRYER". In capacities less than 500 NM3/hr these are uneconomical and not recommended. Also, since regeneration of the desiccant is by atmospheric air, these dryers give Dew Point only upto (-) 40oC.

Cost wise these Airdryers are 100% more costly as compared to "Internally Heat Reactivated Type Dryers". One should go for this type of Dryer only when loss of compressed air during regeneration is not acceptable and Dew Point required is not critical. These are recommended for capacities above 500 NM3/hr only. Operating pressure can be from 1 kg/cm2g to 50 kg/cm2g.

CAPACITIES	500NM3/hr to 6000 NM3/hr
PRESSURE	From 1 kg/cm2g to 50 kg/cm2g
DEW POINT	Upto minus(-)40oC

Request a Quote

--- What We Offer ---