Minneapolis MN USA -- Donaldson Company, Inc. introduces XLR, a new air inlet filtration system for gas turbine intake systems that uses Donaldson PowerCore filter media technology to achieve high efficiency self-cleaning performance with a 40% smaller 3-dimensional footprint.
The PowerCore high density filter media packaging technology, as applied in the new Donaldson XLR self-cleaning filter system, not only reduces the size of the intake filter system, but also reduces the complexity of the installation, shortens field installation time, and significantly reduces the cost of shipping. The key to this size reduction is PowerCore, a way of packaging the filter media that allows for twice the airflow per filter at the same initial pressure loss and filtration efficiency as Donaldson GDX, the current industry standard in self-cleaning filter systems.
Donaldson has marketed a media similar to PowerCore in the past as a replacement panel filter to the aftermarket, but XLR is the first time it has been offered to OEM’s in a complete system. Donaldson has applied PowerCore very successfully in air filtration systems for diesel engines and automotive vehicles. In the XLR system, PowerCore is offered with a choice of Donaldson Duratek or synthetic base media, both with Spider-Web nanofiber technology.
Overview of the Next Generation in Inlet Filtration:
Airflow through the XLR filter system is horizontal with the filter elements mounted horizontally against a vertical tubesheet plenum. The filters are protected from direct exposure to rain and sun with an enclosed access area on the dirty air side. Incoming air is pretreated with either a weather louver, or a weather protection hood with optional inertial moisture separators. Incoming air is cleaned by pairs of PowerCore filters in an outside-to-inside airflow path. Cleaned air then passes to the turbine.
XLR is designed for very low maintenance with automatic self-cleaning, so is appropriate for even remote or difficult-to-access locations. Filter cleaning is accomplished in the same manner as Donaldson’s current GDX: a strong reverse pulse-jet of air is automatically initiated when the pressure loss through the system exceeds a preset limit (per the conditions of the environment.) The filters are then cleaned on a cycle from top to bottom until the system pressure loss returns below the automatic set point. The ejected dust settles to a collection hopper at the bottom of the unit for dust evacuation. And, because the pulse cleaning operation keeps system pressure loss (delta P) low, the turbine can run at peak efficiency to maximize power output.
A walkway behind the louvers or inlet hoods provides easy service access to the filters and pulse valves. The XLR is modular in construction, with module width limited for shipping purposes, and heights varying from 8 filters to 20 filters to accommodate a diverse range of large turbine airflows. The modular design is assembled at the power plant site using 40% fewer bolts and gaskets (than the Donaldson GDX requires) to connect components.
PowerCore is a high-density corrugated flute media technology, and for XLR, it’s packaged in a V shape. The high density of the media pack, as compared to a pleated sheet of media, allows for a greater amount of filter media to be packaged into a given volume of space. This denser construction has the ability to reduce pressure losses due to the flow path changes of air through a filter.
PowerCore -- High-Density Corrugated Media Technology
This corrugated media is constructed by layering alternating rows of flat sheet and corrugated media.The result is a dense, honeycomb-like structure of filter media. The resulting media pack consists of parallel rows of flutes that are open at only one end. To create a filter from this media pack, the ends of the flutes are sealed at alternating ends with an adhesive bead. This bead of adhesive creates a barrier to air on the upstream side of alternating flutes within the media pack, and a corresponding barrier on the adjacent flute at the downstream end. The result is that when placed in an air stream, the air is allowed to enter half of the flute chambers on the upstream side of the media pack, but blocked from exiting those flute chambers on the downstream side. Because of the permeable nature of filter media, the airflow passes through the media fibers and gets cleaned. Once in the adjacent chamber, it exits on the open downstream end and is directed to the turbine.
Airflow path is straighter than it is through conventional pleated media; in fact, turns have been reduced by 25% in the XLR. The result is low pressure loss.
For further details about XLR, contact a regional Donaldson sales office:
In the Americas email or call 800-431-0555
In Europe, Africa, Middle East, email or call +32-16-38-3840
In Asia Pacific, email or call 65-6546-4400
Donaldson Company, Inc., headquartered in Minneapolis, Minnesota USA, is a leading worldwide provider of filtration systems and replacement parts. Founded in 1915, Donaldson is a technology-driven company committed to satisfying customer needs for filtration solutions through innovative research and development. Donaldson serves customers in the industrial and engine markets including power generation, hydraulic systems, dust collection, specialty filtration, compressed air purification, off-road equipment, industrial compressors, and the on-road markets for heavy trucks and light vehicles. More than 9,000 employees contribute to the company's success at 35 manufacturing locations around the world. In fiscal year 2003, Donaldson reported sales of more than $1.2 billion and achieved its 14th consecutive year of double-digit earnings growth. Donaldson is a member of the S&P MidCap 400 Index and Donaldson shares are traded on the New York Stock Exchange under the symbol DCI. Additional company information is available on this website at: “About Donaldson.”
NOTE: PowerCore, Spider-Web, Duratek, XLR, and GDX are tradenames and/or registered trademarks of Donaldson Company, Inc.##
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