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GenDry Wind Turbine Oil Contamination Membrane Dryers
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larger image "For long term protection of wind turbine gearboxes from oil contamination and the harmful effects of moisture" Problem Gearboxes present the biggest challenge to wind turbine reliability due to the extreme stresses imposed by the turbine blades directly connected to the gearbox assembly. These problems are further exacerbated by lubricant degradation caused by moisture, particulate, viscosity issues and acidity. Once liquid water is adsorbed into oil it emulsifies and can never be removed, despite the use of cellulose filter systems. Moisture Intrusion Moisture intrusion occurs during diurnal exchanges of air caused by temperature variations during the day. Moisture is inhaled into the gear box through polyurethane and/or PTFE seals and gaskets by leaks and moisture vapor transmission (MVTR). In cases where a desiccant breather is used, inhale will take place through the breather but these units are generally inadequate in both size and capacity to handle the significant levels of moisture. Currently desiccant breathers are used in various configurations, but as it can be seen from prior paragraphs, the volume of available desiccant is inadequate for required desiccant life cycle of 6 months before change out and in extreme cases could only provide protection for a month before saturation and the gearbox starting to see contamination from moisture at levels of a cup of moisture per week. Solution Recognizing that desiccant breathers provide inadequate protection for the large wind turbines being produced (1-3 MW range). Drytech has developed a stand alone continuous air drying membrane system, GenDry™, that will provide an on going source of dry air <-30° F Dew Point (<400 ppm) to envelop the gearbox free air space, preventing oil contamination from moisture. The GenDry™ system will not require maintenance not desiccant change outs and provide a MTBF of 3-5 years and are designed for rigorous and harsh environments such as offshore or tropical applications where moisture and salt air will accelerate gearbox degradation. The GenDry™ system design utilizes two pneumatic cylinders in parallel acting as air pumps and driven by a heavy duty linear actuator. Essentially, the actuator drives the air pumps and generates a volume of compressed air which is stored in an air reservoir (accumulator). This accumulator will store all of the pressurized atmospheric air produced by the pump cylinder stroke cycle (s) thus minimizing the amount of cycles (3-4 strokes/hour) extending the life of the system to 3-5 years before maintenance. The stored air is continuously released from the accumulator at a given flow and pressure into a coalescer to take out liquid water and then downstream into the membrane filter which removes the moisture and provides < 400 ppm air (<-30° DP) into the gearbox. This design will supply a constant purge supply of low humidity air to the gearbox or other enclosures requiring moisture protection. Example Typical inhale of air into a 10 ft³ gearbox free air space under a diurnal temperature swing of 115°F represents 5.7 grams of moisture/day. Typical MVTR of urethane seals represents approximately 2.0 grams of moisture/day. Typical change out of desiccant breather every 6 months. 183 days @ 7.7 grams/day = 1409.10 grams to be adsorbed (3.1 lb). Typical adsorbtion capability of 3 lb desiccant breather is 476 grams (1.05 lb). Therefore under these conditions a 3 lb desiccant breather will last approximately 2 months.

Results Per Page :


Results 1 - 3 of 3		1

Item #

Model No.

Windturbine

Gear Box Free Air Volume

Air Dryer

Min. Gear Box Air Exchange

1DT70600-10

GenDry™ 10

1.0 to 1.5 MW

10 ft³

<400 ppm
<-30ºC dp

3/hour

1DT70600-20

GenDry™ 20

1.5 to 2.5 MW

20 ft³

<400 ppm
<-30ºC dp

3/hour

1DT70600-30

GenDry™ 30

3 MW

30 ft³

<400 ppm
<-30ºC dp

3/hour


Results 1 - 3 of 3	1

APPLICATIONS: Defense & Aerospace - Electronics - Electro-optics - Marine - Bulk Liquid/Powder Storage - Wind Power/Wind Turbine

Drytech, Inc. | 54 Wrightstown-Cookstown Rd P.O. Box 0128 Cookstown, NJ 085110128
Toll Free: 800-221-0208 | Phone: 609-758-1794 | Fax: 609-758-1774 | email: drytech@drytechinc.com