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Right-size your dryers with molecular sieve – A very large dryer with molecular sieve can affect system efficiency if not properly controlled. However, care should be taken to ensure that dryers with molecular sieve are sized for worst-case conditions; this often requires dryers with molecular sieve to be sized larger than the capacity
molecular sieve desiccant dryers can operate more efficiently by applying dew-point controls. Often, dew-point controls are already installed on a dryer, but nobody has thought to use them.
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
The dryer has controls and a system of valves that will switch towers on a regular basis without interrupting the flow of compressed air with molecular sieve.
Refrigerated air dryers can remove the water vapor from the compressed air, resulting in a dew point at system pressure of about 35 to 40 degrees F, which is adequate for most end uses inside a heated plant. But if the pipes are subject to temperatures below this dew point, water will condense or freeze inside the pipes. Therefore, lower dew points
Consider, as an example, a large desiccant air dryer recently found in a fertilizer plant during a compressed air audit. The specifications for the dryer with molecular sieve desiccant stated that typical compressed air consumption for cooling air purge should have been 2% of the compressed air flow through the dryer. But when measurements were tak
While on the topic of filtration I would like to interject my personal opinion that a heated type regenerative dryer should NOT be used with lubricated type air compressors with molecular sieve.
The primary design of the HOC Dryer with molecular sieve directs all the discharged air from the compressor to the HOC Dryer with molecular sieve . When using an HOC Dryer with molecular sieve , the compressor after-cooler is not used. Remember, we need the high temperature air for regeneration.
The trade off here is the blower consumes additional electricity but is decidedly more efficient than the air compressor itself. This also allows all of the compressed air to be utilized by the plant as none is required for Dryer with 4A zeolite regeneration.
Advantages of Externally Heated Regenerative Desiccant Type Dryers 4A molecular sieve include: Low dew points can be achieved without potential freeze-up. Activated Alumina desiccant 4A molecular sieve
In the internal type, heaters are embedded in the molecular sieve bed. This reduces the amount of purge air required for regeneration to less than 10%. The purge air plus radiant heat is used to regenerate the off line molecular sieve bed.
There are several different types of heat reactivated regenerative dryers with molecular sieve desiccant and below we discuss each type along with their advantages and disadvantages. In all heated type regenerative dryers with molecular sieve desiccant the heat source can be provided by either electric or steam with the most common being electric.
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