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Vapor purification with self-cleaning filter

United States Patent

December 9, 2003
View the Complete Patent at the US Patent & Trademark Office
Pacific Northwest National Laboratory - Visit the Technology Commercialization Program Website
A vapor filtration device including a first electrode, a second electrode, and a filter between the first and second electrodes is disclosed. The filter is formed of dielectric material and the device is operated by applying a first electric potential between the electrodes to polarize the dielectric material such that upon passing a vapor stream through the filter, particles from the vapor stream are deposited onto the filter. After depositing the particles a second higher voltage is applied between the electrodes to form a nonthermal plasma around the filter to vaporize the collected particles thereby cleaning the filter. The filter can be a packed bed or serpentine filter mat, and an optional upstream corona wire can be utilized to charge airborne particles prior to their deposition on the filter.
Josephson; Gary B. (Richland, WA), Heath; William O. (Richland, WA), Aardahl; Christopher L. (Richland, WA)
Battelle Memorial Institute (Richland, WA)
10/ 013,010
October 26, 2001
This invention was made with Government support under Contract Number DEAC0676RL01830 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.