CN86100318A - Filter and catalyzer for treating particles in exhaused gas from diesel engine - Google Patents

Abstract

The invention relates to filter that removes the diesel engine particulate thing and catalytic filter with ceramic filter element of integrated.It captures the particulate matter in the blast air get off by filtration, is removed through catalytic oxidation.It is made with extrinsion pressing.It is to be made of the refractory element and the adjunct that contain catalyzer dioptric type corrugated hollow cylinder.This element has wall and approaches.Effectively outer surface is big, resistance is little, zigzag wall at an angle, spacing is little between wall, has the noise elimination effect.After this element assembling, all not moving radially and move axially generation in filter in any case can be not cracked because of vibrations yet.

Description

Filter and catalyzer for treating particles in exhaused gas from diesel engine

The utility model is about diesel exhaust filter and the catalytic filter with integrated ceramic filter element.

Be to remove noxious pollutant, especially particulate matter in the diesel exhaust gas, U. S. Patent 4,364,761 and existing report such as EPO073634.Their solution is: use and the honeycomb ceramic body identical materials, the hole of honeycomb ceramic body both ends of the surface, respectively stop up some holes respectively, blast air is entered from the unplugged duct of an end, pass the micropore on the wall, discharge from the adjacent unplugged duct of the other end, the particulate matter in the air-flow is retained down, attached on the wall of honeycomb ceramic body and in the wall, particulate matter is removed under the effect of catalyzer.The shortcoming of this filter is: 1, need post forming; 2, obstruction and body easily produce the crack after roasting; 3, the duct of both ends of the surface some be plugged, cause useful area to reduce; 4, resistance is big.

As you know, before the air inlet of various internal-combustion engines air-strainer is housed all.It is made with paper, and it has, and the little outer surface of volume is big, and resistance is little, the advantage that air speed is big.In view of the deficiency of above-mentioned filter, we get its advantage, abandon its shortcoming, change shape and material, it is extended just can make filter in the purification work of diesel engine particulate thing.

For this reason, we have designed a kind of mould.Required material, Bond, oiling agent and water mix by a certain percentage, mediate, and just can extrude the object identical with mold shape by this mould.For example aluminium oxide or steinheilite grinding are become fine powder, get the screening of 200～400 purposes, 1 part in alumina powder or steinheilite powder, add Bond (polyvinyl alcohol, methyl cellulose, poly-propionamide) 0.1～0.25 part, oiling agent (machine oil, fluid wax) 0.01～0.1 part and water are mixed together for 0.1～0.3 part, mediate, through extrusion modling, high temperature (1000～1400 ℃) roasting forms dioptric type corrugated thin-walled hollow cylinder refractory body (external diameter 100mm, internal diameter 50mm), its length is decided with the need, from manufacture method, it only need once push just plastic, and the alternate amplifier case of blocking a part of hole of both ends of the surface then needs twice moulding; Do not have the crack after the former moulding, the latter but has; The former resistance is little, and latter's resistance is big; The former gas is radial and axial flowing, and the latter is a wall-flow type; The former has several angle by two zig zag planes, faces the wall and meditates from complications and goes up the air-flow that micropore comes out, repeatedly refraction between two walls, the phase mutual interference just can play the effect of noise elimination, and the latter's wall is vertical, air-flow flows along wall, and noiseless generation, its noise elimination effect are just not as the former; Its both ends of the surface cushioned and are fixed on the insulation cushion on the flange of base when the former assembled, and were again the spaces of gas flow around it, and under any circumstance, it does not have radially or moves axially, can be not cracked because of vibrations yet; The former is easy for installation, and the latter installs complexity.

Catalyzer is catalytic filter on the filter appendix of the present utility model.It can from blast air, be retained down, attached on its wall and the particulate matter in the wall remove through catalytic oxidation.

Brief description: Fig. 1 is the longitudinal section by filter and catalyzer for treating particles in exhaused gas from diesel engine; Fig. 2 is the cross section of Figure 1A-A; Fig. 3 is the amplification cross section of Figure 1A-A.

Base in the accompanying drawing (7) welds with an end of shell (5), the tight joint welding of internal diameter of the outer rim of this end and exhaust hood (8), and the other end of exhaust hood is welded with outlet pipe (9).An end that contains the dioptric type corrugated hollow cylinder refractory element (11) of catalyzer is fixed on the flange of the base (7) that is with heat-resisting insulation elastic pad (10), and the other end compresses it by means of insulation elastic pad (13) and compressing tablet (4).In an end of tube (12) place in the groove of base (7), the other end then compresses it and seal up with the end plate (2) and the heat keeper (3) that are welded with suction tude (1), the space between it and the shell (5) is filled with thermal insulating material.End plate (2) and shell (5) welding.

Claims (2)

1, the catalytic filter of being made up of ceramic filter element is characterized in that the particulate filter that the hollow refractory cylinder of undulatory hollow refractory cylinder of dioptric type and analogous shape is made;

2, require the design specification requirement of model utility according to claim 1.

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