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Assignee3M Innovative Properties Company
InventorsZ. Gerald Liu, Matthew P. Henrichsen, William C. Haberkamp, Elaine M. Yorkgitis, Robert K. Miller, Thomas E. Wood, Zhongshu Tan, Barry M. Verdegan
Estimating the term…
A filter, system and method is provided for filtering nanoparticles in a hot gas, namely particles <about 1 micron in a gas >about 200° C. and further particularly >about 450° C. including diesel exhaust. The filter includes filter media material composed of fibrous filter media having a plurality of fibers and granular filter media having a plurality of granules extending from the surfaces of the fibers. The filter is characterized by a permeability >about 3×10−12 m2 and an inertial resistance coefficient <about 1×106 m−1. The filter captures particles in the Most Penetrating Region (MPR). A filter system includes a nanoparticle filter in series with a diesel exhaust treatment element.
A filter comprising a hybrid filter media for filtering nanoparticles in a gas flowing along an axial flow direction and having a gas temperature greater than about 200° C., said hybrid filter media comprising first and second sheets, said second sheet having a plurality of pleats defined by wall segments extending in a zig-zag manner between pleat tips at axially extending bend lines, the pleat tips on one side of said second sheet being in contact with said first sheet to define axial flow channels, at least one sheet of said sheets comprising, in the same sheet, a) fibrous filter media having a plurality of fibers;
A filter comprising a hybrid filter media for filtering nanoparticles in a gas flowing along an axial flow direction and having a gas temperature greater than about 200° C., said hybrid filter media comprising first and second sheets, said second sheet having a plurality of pleats defined by wall segments extending in a zig-zag manner between pleat tips at axially extending bend lines, the pleat tips on one side of said second sheet being in contact with said first sheet to define axial flow channels, the hybrid filter media having a permeability greater than about 3×10−12 m2 and an inertial resistance coefficient less than about 1×106 m−1.
Dependencies are inferred from the claim text.