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Desiccant Dryer, Heat Of Compression
Desiccant Dryer, Heat Of Compression
Fine Air offers a heat of compression Desiccant Dryer. For this type of dryer, an after cooler is not provided immediately after the compressor discharge, as the heat of compression is used to regenerate the desiccant of the dryer. In the dryer, inlet air first comes to the 3-way diaphragm control valve, where it is directed to flow for heating or cooling, depending upon cycle of reactivation. For heating in the reactivation cycle, air is directed to the reactivation tower via a booster heater (if the temperature of the inlet air to the reactivation tower is not adequate, booster heater shall be switched On to increase the temperature as required); while in cooling of the reactivation, the air is directed to the reactivation tower via the air inlet cooler. This air will reach the reactivation tower through the top 4-way valve. Incoming air is partially saturated with high temperature, so that it has maximum moisture carrying capacity and passes through the reactivation tower, where it carries the moisture adsorbed (in the previous cycle) by the desiccant and leaves the tower from the bottom 4-way valve. Now this wet air enters the reactivation air cooler, where the air will be cooled to 40ºC and moisture will be removed in the moisture separator. Further the air passes through pre-filter where it comes into contact with polymer candle element which removes dust particles up to 5 micron and water droplets too are effectively removed. Thereafter this air enters the second desiccant packed via 4-way valves to get dried. The desiccant has a high surface area to porosity that enables it to hold large quantity of moisture from the compressed air (desiccant also possess the property of expelling moisture on heating, hence the reactivation is done by hot air). Dry air leaves from the bottom 4-way valve and enters the after filter, which like the pre-filter has a polymer candle element, which prevents the desiccant dust carry over to the system. Hence in this process, there is no loss of compressed air and heat of compression is used for reactivation.