HEATLESS AIR DRYER

PNEUM SYSTEMS INC, has developed Heatless Air Dryer which is a chemical desiccant using dryer, working on adsorption principle. The system consists of twin towers filled with desiccant of appropriate quality and quantity. Wet compressed air after being filtered by the prefilter and coalescing oil filter enters the distribution valve. An electrically operated valve with built in passages, which directs the air to one tower. The air is then passed through the tower and comes out in dry condition. The air is then passed through after filter to remove any carry over dust, via non-return valve. There is a by-pass arrangement with an orifice, to allow a fraction of dry compressed air to expand and pass through the other tower, here by regenerating it and making it ready for adsorption Cycle. The Regenerating air is passed out to the Atmosphere via muffler. At a preset time, the sequence control timer actuates the Distributor valve to reverse the tower function . For lower capacities, the distribution valve and control valve are integral units, however for higher capacity these control elements comprise of discrete control valves and orifices. Our Heatless air dryers are compact, economical, pre assembled, fully automatic, “Fit and Forget” type of units with very little power consumption of around 100 watts.  For detailed offer, please indicate capacity, pressure, and source of compressed air. 

FEATURES (ALL MODELS)

* Outlet air dew point of -40oC is achieved. 
* There is no increase in the effluent gas temperature. 
* Since the drier size depends only on flow and pressure, inlet temp. of 10oC to 50oC can be handled by same unit. 
* Very low spare parts inventory. 
* Desiccant beds can remove oil in its vapour form. 

AIR RECEIVER
These are either horizontal or vertical installations depending upon the space availability. The size may vary from 100 liters to 10 m3. On horizontal receivers the compressor and motor can be mounted to save the space of operation. Compressors up to 20 H.P. can be suitably mounted on the horizontal tanks up to 500 liters capacity.

CONSTRUCTION :

All receivers are made from carbon steel and built to IS-2825 or ASME code section VIII. The working pressures may vary from 75 psig (5 kg/cm2) to 750 psig (50 kg/cm2) Vessels can be manufactured as per other codes if required. Each vessel is fitted with a pressure relief valve, a pressure gauge, a drain valve, air inlet and air outlet connections. Pressure switch and other safety fittings can be supplied on request. Each vessel is hydrostatically tested as per relevant code. Other non destructive testing like radiography, Ultrasonic test etc. can be provided if required.

AFTER COOLER

CONSTRUCTION :
The unit is a shell and tube heat exchange with M.S. shell and Copper tubes. In case of Horizontal after cooler the water passes through shell over the tubes carring hot compressed air. There is a moisture separator provided at the outlet of the cooler which removes the oil and water droplets formed due to cooling.

INSTALLATIONS :
The unit is suitably supported horizontally. The outlet of the compressor is connected to the inlet of the cooler and the outlet of the cooler is connected to the receiver with necessary piping. This is the ideal suggestion. However sometimes the cooler can be connected at the outlet of the receiver and out fleat of the moisture separator can be connected to the downstream consumers. The cooling water connection to the unit should be given after the pump and outlet from the cooler can be lead to pump or cooling tower.

OPERATION :
The cooling water circulation is started. The compressor is started. Hot air from the compressor is passed through the cooler where it gets cooled to ambient condition. The water and oil vapours, which are condensed are separated in the moisture separator. This condensate should be drained regularly to avoid carry over. Removal of excess water droplets from any compressed air or gas system, is efficiently and simply accomplished in the moister separators. Capacities ranges from 10CFM To 6000 CFM with various WORKING PRESSURES.

DUPLEX FILTERS

The Compressed air at the outlet of its receiver contains oil, Dust and some Moisture. To deal with this menace, Pneum Systems Inc, have developed the duplex filter, to take care of wide range of these impurities. These filters are the combination of carbon filter and micro filter. The first part consists of an activated carbon bed. This bed is capable of removing oil vapours by absorption principle, during upward flow of the gas/air. The air leaving this unit will contain oil vapours to the tune of 8 ppm. min. depending on the inlet oil content and status of charge. The micro filter unit has micro porous filter elements of polyethylene / ceramic. These elements have filtration efficiency of 99% upto 5-10 microns of solids or liquid particles.

These filters have following characteristics :

1. Wide range covering from 10 CFM to CFM-FAD. 
2. Low pressure loss across the unit. 
3. Filteration efficiency upto 8 ppm for oil content and 99% upto 5-10 microm for dust. 
4. The unit can be designed for any working pressure upto 50 bar. However standard units are designed for 7-10 bar pressure. 
5. The units are designed and constructed in accordance with pressure vessel codes i.e. IS-2825 or ASME VIII DIV. I. 

The activated carbon charge provided in the filter is non regenerative type and should be replaced after about 2500 hrs. of operation, depending upon the oil content in the compressed air. The porous filer elements can be cleaned by reverse flow of clean air under pressure.

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