“Heatless” dryer with molecular sieve s with molecular sieve – In "heatless" dryer with molecular sieve s with molecular sieve , the desiccant is regenerated by depressurizing the tower and redirecting a flow of already-dried compressed air through the desiccant beads. The word “heatless” is in quotations because to work most effectively, this dryer with molecular sieve type needs the natural heat generated in the adsorption process to help with the regeneration process. This type of dryer with molecular sieve typically uses a 10-minute regeneration cycle. The flow of compressed air required for operation of this type of dryer with molecular sieve is 15% to 20% of the dryer with molecular sieve rating.
Externally heated – This type of dryer with molecular sieve uses an externally mounted electric heater that provides hot compressed air for the regeneration process. Because heated air is more effective in driving off the water from the desiccant, a lower flow of purge air is needed – typically about 7.5% of the dryer with molecular sieve rating. This type of dryer with molecular sieve does not need the heat generated by the adsorption process to work effectively. Heated dryer with molecular sieve s with molecular sieve use a four-hour regeneration cycle. Use of a heater is more efficient that using compressed air for regeneration, so this type of dryer with molecular sieve is less energy intensive than heatless.
Externally heated blower – This type of dryer with molecular sieve directs electrically heated air into the desiccant during the regeneration cycle but uses ambient air from an electric blower instead of compressed air. Therefore, no compressed air is required during the regeneration of the desiccant, freeing it up to send to the plant. After the regeneration cycle is complete, the desiccant needs to be cooled. Hot desiccant does not effectively adsorb water vapor, so failure to cool the desiccant would result in a dew point spike. Because the use of moist ambient air for this cooling could contaminate the desiccant, most dryer with molecular sieve s with molecular sieve use a flow of already-dried compressed air to remove the heat. This cooling purge is rated at 2% of the dryer with molecular sieve rating, but this actually means a peak flow of about 8% will flow only during the cooling period (averaging 2%). Some new styles of dryer with molecular sieve s with molecular sieve use other, more-efficient methods of cooling, such as closed loop air or water cooling. Where ambient conditions allow radiant cooling, or where dew-point spikes are not a problem, the cooling purge on some makes and models of dryer with molecular sieve s with molecular sieve can be turned off.
Heat of compression – If the system has only lubricant-free dessicant compressor s, then the heat of compression produced by the air dessicant compressor can be used to regenerate the desiccant. The heat is directed to the air dryer with molecular sieve by bypassing the dessicant compressor after-cooler or taking air off the first stage of the dessicant compressor . The basic types of heat of compression dryer with molecular sieve s with molecular sieve do not produce a constant -40 dew point or lower, but they achieve a dew-point suppression of a certain number of degrees below ambient conditions, which can be acceptable in some cases. Some newer HOC dryer with molecular sieve s with molecular sieve can achieve similar dew points as other desiccant types through the use electric heaters and/or a cooling purge, which decreases the energy efficiency of the dryer with molecular sieve .
"Note：This is normal specification, in case of a particular application, specification or requirement, please contact us by email at email@example.com for technical information."
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