Product Description
Quincy QHD heatless desiccant dryers use a small portion of dried, compressed air to purge and regenerate the off-line tower. The QHD has been engineered to ensure optimal performance and efficiency in a range of different applications while keeping downtime to a minimum.
The QHD series of desiccant dryer systems includes 13 models that deliver between 230 and 3,600 CFM of clean, dry air at a pressure of 100 psig. All feature a heavy-duty steel base and dual tower configuration that regenerates automatically.
Under normal operation, air is forced upwards through the drying tower, where moisture and contaminants are removed and a small amount — 15% — of air is diverted downwards through the regeneration tower where it depressurizes the desiccant bed to ambient conditions. Overall velocities are kept below 50 feet/minute so that air remains in contact with the desiccant for a minimum of 4.5 seconds. The entire process follows a 6-10 minute NEMA cycle, which consists of three to five minutes of drying time, 2 minutes and 25 seconds to 4 minutes and 20 seconds of regeneration and 40 seconds of re-pressurization.
Like all our desiccant-type air dryers, the QHD heatless air dryer system includes high-quality components and is backed by a two-year comprehensive warranty. For details, download the product brochure or contact a Quincy rep directly.
- Initial cost: Low
- Operating cost: Moderate to high
- Maintenance cost: Low
- -40° to -100°F dew point
- 230 – 3,600 cfm
- 15% purge
- Microprocessor control
Desiccant air dryer systems consist of a pair of towers containing silica gel or another desiccant. Quincy machines use our proprietary Q-Sorb product, an enhanced formula derived from activated alumina that provides improved absorption, lower pressure drop and higher crush strength.
As air passes through the towers, water vapor clings to the desiccant, effectively stripping it from the air until a desired moisture content is met. We measure moisture in pressure dew point (PDP). PDP refers to the temperature it would be necessary to cool air to achieve the same amount of dryness. For example, in many process industry applications, a PDP of at least -40°F is recommended. In other words, air is required to have the same moisture level it would have at -40°F.
Desiccant air dryers work in conjunction with an industrial air compressor. Their dual tower design allows you to time drying operations to a standard NEMA cycle, in which the one tower regenerates (purges) while the other performs the drying function. This prolongs desiccant life and allows for continuous operation for extended periods.
A desiccant air dryer system is an important component of any industrial operation in which compressed air of a uniform quality is required. Most air dryers run off electrical power. Because they are for continuous use, however, they can represent a significant operating expense over time. That’s why it’s important to choose a machine from a manufacturer you can trust.
Quincy Compressors has been in business since 1920. Our products are designed to work together to provide a complete compressed air solution for any heavy-duty or industrial application. Our current line of products includes heatless, heated purge, blower purge and modular desiccants.
