A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
WALL-FLOW FILTER WITH THIN POROUS CERAMIC WALL
PROBLEM TO BE SOLVED: To provide a thin-walled wall-flow filter which combines sufficient mechanical strength and sufficient bulk heat capacity, realizes a relatively low pressure drop and relatively high initial filtration efficiency (EP0), and enables packaging of the filter in a smaller volume.SOLUTION: The ceramic wall-flow filter includes a plurality of porous ceramic walls forming multiple cell channels. At least some of the cell channels have plugs to force an exhaust gas to pass through the walls, thereby filtering out particulates contained in the exhaust gas. The walls have a thickness and a median pore diameter (MPD) that satisfy 102 μm≤Twall<279 μm and 10<40. The relatively small median pore diameter (MPD) in comparison to the wall thickness (Twall) allows the use of thinner walls that provide less flow resistance than thicker walls while maintaining sufficient initial filtration efficiency (EP0).
【課題】十分な機械的強度と十分な嵩熱容量を組み合せて、薄壁を備えた壁流通式フィルタを比較的高い初期濾過効率（ＥＰ０）と、比較的低い圧力低下を実現し、かつより小さい容積内にフィルタを収めることを可能にする壁流通式フィルターの提供。【解決手段】フィルタは、複数のセルチャンネルを形成する多数の多孔質セラミック壁を備え、少なくとも一部分のセルチャンネルは、排気ガスをして強制的に壁を通過させる栓を備え、これにより排気ガスに含まれている微粒子を濾過し、壁は、１０２μｍ≰Ｔｗａｌｌ＜２７９μｍの厚さと、１０＜Ｔｗａｌｌ／ＭＰＤ＜４０でもある気孔径中央値（ＭＰＤ）とを有し、壁の厚さ（Ｔｗａｌｌ）に比較して小さい気孔径中央値（ＭＰＤ）は、十分な初期濾過効率（ＥＰ０）を保ちながら、より厚い壁よりも低い流動抵抗を提供する、より薄い壁の使用を可能にするセラミック壁流通式フィルタ。【選択図】図９
WALL-FLOW FILTER WITH THIN POROUS CERAMIC WALL
PROBLEM TO BE SOLVED: To provide a thin-walled wall-flow filter which combines sufficient mechanical strength and sufficient bulk heat capacity, realizes a relatively low pressure drop and relatively high initial filtration efficiency (EP0), and enables packaging of the filter in a smaller volume.SOLUTION: The ceramic wall-flow filter includes a plurality of porous ceramic walls forming multiple cell channels. At least some of the cell channels have plugs to force an exhaust gas to pass through the walls, thereby filtering out particulates contained in the exhaust gas. The walls have a thickness and a median pore diameter (MPD) that satisfy 102 μm≤Twall<279 μm and 10<40. The relatively small median pore diameter (MPD) in comparison to the wall thickness (Twall) allows the use of thinner walls that provide less flow resistance than thicker walls while maintaining sufficient initial filtration efficiency (EP0).
【課題】十分な機械的強度と十分な嵩熱容量を組み合せて、薄壁を備えた壁流通式フィルタを比較的高い初期濾過効率（ＥＰ０）と、比較的低い圧力低下を実現し、かつより小さい容積内にフィルタを収めることを可能にする壁流通式フィルターの提供。【解決手段】フィルタは、複数のセルチャンネルを形成する多数の多孔質セラミック壁を備え、少なくとも一部分のセルチャンネルは、排気ガスをして強制的に壁を通過させる栓を備え、これにより排気ガスに含まれている微粒子を濾過し、壁は、１０２μｍ≰Ｔｗａｌｌ＜２７９μｍの厚さと、１０＜Ｔｗａｌｌ／ＭＰＤ＜４０でもある気孔径中央値（ＭＰＤ）とを有し、壁の厚さ（Ｔｗａｌｌ）に比較して小さい気孔径中央値（ＭＰＤ）は、十分な初期濾過効率（ＥＰ０）を保ちながら、より厚い壁よりも低い流動抵抗を提供する、より薄い壁の使用を可能にするセラミック壁流通式フィルタ。【選択図】図９
WALL-FLOW FILTER WITH THIN POROUS CERAMIC WALL
薄い多孔質セラミック壁を備えた壁流通式フィルタ
BEALL DOUGLAS M (author) / HEIBEL ACHIM K (author) / TANDON PUSHKAR (author)
2015-07-02
Patent
Electronic Resource
Japanese
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