Patent ID: 7473288
Filing Date: 2009-01-06
Classification: C10L,F01N,Y10S

Abstract:
1. A particulate matter reducing apparatus for burning and reducing particulate matter contained in exhaust gas of a diesel engines, while collecting the matter on the apparatus, which comprises: at least one filter for collecting the particulate matter thereon, the filter being comprised of a plurality of wire mesh filter elements wherein the wire mesh is superposed on itself in a plurality of layers, each being formed in a column shape and provided with a central through hole, the filter elements having their central holes being axially aligned and the plurality of filter elements being coaxially housed in an outer cylindrical casing for connection to an exhaust pipe for the exhaust gas, and the filter being releasably retained between a pair of shielding plates having one or more air holes while having a gap provided between the outer circumferential surface of the filter and the outer cylindrical casing, the pair of shielding plates dividing the inside of the outer cylindrical casing in front and rear, respectively, an outer circumferential section of one shielding plate being provided with one or more of said air holes communicating with the gap, while a central section of the other shielding plate is provided with a center air hole communicating with the central through holes of the filter elements, and the filter causing the exhaust gas to flow between the outer and inner circumferential surfaces thereof, wherein one of said shielding plates is upstream and the other of said shielding plates is downstream relative to flow of the exhaust gas, an outer circumferential surface of the filters serves as an intake surface of the exhaust gas and an inner circumferential surface thereof serves as an exhaust surface of the exhaust gas, and the exhaust gas flows through the filters from the outside to the inside thereof, whereby the particulate matter is evenly collected on each of the filters, at a predetermined collection rate of particulate matter of from 20 to 50% in the absence of a catalyst in total by a combination of selection of wire diameter, wire mesh filling density and the number of filter layers of wire mesh in the filter elements, wherein each of the filters is provided with a filter surface area necessary for the predetermined collection rate relative to the quantity of exhaust gas; wherein the structure of wire mesh of each of the filter elements is comprised of mesh aggregates of a metal wire, the filter elements are regeneratable by burning and eliminating the particulate matter collected thereon, the wire of each of the filter elements has a diameter of from 0.2 mm to 0.8 mm, and the filling density of each of the filters being from 10% to 40%.