Membrane Air/Gas Dryers
Membrane dryers are a cost-effective way to manufacture a continuous stream of dry air on-site. These robust dryers use selective permeation, a passive technology, to separate water vapor from the air stream. The resulting flow of dry air is ready for use in most industrial applications.
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Air Products Cactus Membrane Air & Gas Dryers
- Available in Alberta, Saskatchewan and Manitoba
- Call 1-800-665-9725 (Alberta), 1-306-580-9000 (Saskatchewan), 1-877-323-7247 (Manitoba) for pricing
- OR request a quote below
Air Products Cactus Membrane Air & Gas DryersAir Products CACTUS PC membrane dryers are a cost-effective way to manufacture a continuous stream of dry air/gas on-site. These robust dryers use selective permeation, a passive technology, to separate water vapor from the air/gas stream. The resulting flow of dry air/gas is ready for use in most industrial applications.The fixed internal purge makes these dryers robust and easy to operate.Cactus dryers require no outside power supply, have no moving parts, and do not require regeneration or replacement of expensive desiccants to function. These maintenance-free, compact dryers work where desiccants and refrigeration units are not practical.
Features and Benefits
The Cactus dryer is manufactured with durability and performance in mind. The passive technology uses no electricity, which makes it ideal for use in remote applications, mobile compressor stations, or on construction sites. Built from high performance ABS, aluminum, and stainless steel, PC dryers withstand the most grueling environments. Many of our dryers are in service longer than ten years.
Cactus membrane dryers can be mounted vertically or horizontally to meet your design requirements. Dryers are available in a variety of configurations (see ordering information). Multiple dryers in parallel are used to increase capacity beyond that available with a single dryer. Note: all of the dryers must be the same model, and piping must be configured so that the feed air is distributed evenly between the parallel dryers.
Every membrane dryer has to pass our rigorous testing requirements before it will be released into service. You can be confident that every dryer will perform as advertised. The AS 9100 certification meets the exacting requirements of the global aerospace industry for quality management systems.
Cactus membrane dryers are designed to handle industrial production loads. Pressures up to 20.7 barg (300 psig) ensure that your air/gas production requirements will be met. The solid construction is a perfect match for remote and severe-duty installations like oil platforms and mining operations.
The selective permeation technology uses a passive system with no moving parts. This simple system allows you to engineer more reliable products that can be deployed in a wide range of environments, including mobile systems.
Cactus membrane dryers are easily commissioned. Simply apply compressed air/gas, and production begins. No break-in period, expensive media, or complex equipment to manage and maintain.
How the Cactus Membrane Dryer WorkThe CACTUS PC air dryer is a membrane dryer. Membrane dryers passively produce dry air with no moving parts or electrical components, consumable media, or desiccant dust carry-over. They provide silent and uninterrupted operation for a wide range of dew point specifications. Membrane dryers remove water vapor from gas streams by the selective permeation of water molecules through polymers. Membrane dryers can be described as “molecular filters” where water travels across the membrane faster than other gas molecules.
The permeation of gases is driven by the difference in partial pressure across a thin polymeric separating layer supported on a spongy porous substrate which makes up the core of the membrane. Gases permeate across the separating layer in either direction at a rate that is proportional to the driving force and the permeation coefficient. As wet feed gas flows along the high-pressure side (the“feed” side) of a membrane dryer, water permeates across the membrane to the low-pressure side (the “permeate” side). The water vapor content of the feed gas becomes progressively lower as it flows along the length of the membrane dryer, which causes less driving force for permeation.
A dry stream of air flows in a counter current direction at low pressure on the permeate side to increase the driving force for water permeation at the dry end of the membrane dryer. This dry stream is called the dry sweep or inlet purge. Cactus dryers utilize an internal purge which eliminates the need for a secondary stream of dry air to be fed into the membrane separator.
The purge gas carrying the removed water vapor on the permeate side flows in the direction opposite to the feed stream. This “counter-current”flow enables the highest possible driving force to be created over the length of the membrane dryer. Performance is improved (increased dryer capacity or decreased purge) by operating the permeate side at the lowest feasible pressure.
The module houses the membrane element and provides connection ports for the inlet feed air and outlet dry product air. The membrane element consists of a bundle of hollow fibers with the ends potted in epoxy or other resin. The wet feed gas enters and flows through the bores of the hollow fibers, and dry gas exits the bores of the hollow fibers at the opposite end.
Feed Air/Gas Requirements
Cactus dryers are specifically designed to remove water vapor. Dryer performance will be reduced if liquid water or liquid compressor oilenters the membrane dryer. Coalescing filters must be installed upstream of the membrane dryer in order to remove both bulk and aerosol liquid water and liquid compressor oil. Food and drug applications or special electronic uses require oil vapor removal by installing an activated carbon adsorption filter after the coalescing filters.
Dryer Performance - Quick Reference
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