OFFLINE MEASUREMENT OF HONEYCOMB BODY FILTRATION EFFICIENCY

    公开(公告)号:US20230213433A1

    公开(公告)日:2023-07-06

    申请号:US18008510

    申请日:2020-07-08

    CPC classification number: G01N15/1434 G01N15/1404 G01N2015/1486

    Abstract: Apparatus and methods are disclosed which are capable of being used to determine filtration efficiency of a filter body even in a clean state. Methods of determining a filtration efficiency of a filter including forcing an inlet flow comprised of a gas (such as air) flow into the inlet end of the filter at a set flow rate, introducing particles such as smoke particles into the inlet flow, and optically counting the number of particles entering and exiting the filter during a sampling event, such as with diffraction based optical particle counters positioned upstream and downstream of the filter. Preferably the gas flow is a soot-free flow stream which does not load the honeycomb filter body with contaminants that need to be removed or burned out. The filter body can thus remain in an essentially clean state even after testing its filtration efficiency.

    HONEYCOMB BODY AND PARTICULATE FILTER COMPRISING A HONEYCOMB BODY

    公开(公告)号:US20200254435A1

    公开(公告)日:2020-08-13

    申请号:US16861783

    申请日:2020-04-29

    Abstract: A honeycomb body having a porous ceramic honeycomb structure with a first end, a second end, and a plurality of walls having wall surfaces defining a plurality of inner channels. A highly porous layer is disposed on one or more of the wall surfaces of the honeycomb body. The highly porous layer has a porosity greater than 90%, and has an average thickness of greater than or equal to 0.5 μm and less than or equal to 10 μm. A method of making a honeycomb body includes depositing a layer precursor on a ceramic honeycomb body and binding the layer precursor to the ceramic honeycomb body to form the highly porous layer.

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