CN201401218Y - Special-shaped POC metal carrier post-processor with buffer gap at the outlet of three substrates - Google Patents

Abstract

The utility model relates to a special-shaped POC metal carrier post-processor with a buffer gap at the outlet of three kinds of substrates. The inlet and outlet of the metal carrier are metal foam cake-A-type carrier; the outlet end is provided with a buffer gap completely composed of foam metal cake; metal foam cake-A-type carrier, wire mesh cake-B-type carrier and single-layer wire The nets are all coated with an oxidation catalyst coating; the top of the foam metal cake-A type carrier on both sides of the buffer gap and the inlet and outlet is welded and fixed with the shell by a metal retaining ring. With high mechanical strength, it is applied to the vehicle-mounted POC post-processor, and the exhaust smoke of the engine is reduced by 39-61%; there is no back pressure problem; in the case of comparable performance, the price is equivalent to 1/4-1/ of the imported product 5. Cost saving.

Description

Special-shaped POC metal carrier post-processor with buffer gap at the outlet of three substrates

Technical field:

The utility model relates to three types of special-shaped POC metal carrier post-processors with buffer gaps at the outlet of the base body, which are applied in the automobile engine industry and meet the requirements of environmental protection standards above Euro 4.

Background technique:

The harmful components in automobile engine exhaust are mainly PM, NOX, HC and CO. In the past 2 to 3 years, low-emission engines have become an ideal that people debate, care about, and even aspire to achieve.

The United States Environmental Protection Agency (EPA) 2007 emissions regulations require automakers to simultaneously reduce particulate (PM) and nitrogen oxides (NOX), two major pollutants, in vehicle exhaust. This requires considerable skill, and there are no shortcuts to solving this problem. According to the traditional method, the reduction of one kind of pollution will inevitably lead to the increase of another kind of pollution. Automakers appear to be in trouble.

Under the pressure of emission regulations, on the one hand, vehicle diesel engines are constantly undergoing technical upgrades and improvements; 4 or Euro 5 emission standards.

The essence of SCR post-processor technology is to use urea to decompose NH ₃ at high temperature, and NH ₃ as a reducing agent reacts with NOX in engine exhaust under the combined action of catalyst and temperature, and produces non-toxic NH 3 under ideal conditions. N ₂ and H ₂ O, so as to achieve the purpose of purification. However, the structure of the SCR post-processing system is complicated, and the cost of each set is between 11,000 yuan and 25,000 yuan, which has become an obstacle to popularization and application.

The essence of the DPF post-processor technology is to use a special carrier, such as a 'wall-flow' ceramic or silicon carbide carrier after the honeycomb holes at the inlet and outlet ends are blocked alternately. The filtration efficiency of 'black smoke' such as PM can reach up to 90%, and the factory inspection of new cars can fully meet the Euro 4 or Euro 5 emission standards. However, this kind of ceramic DPF carrier is expensive and cannot be produced domestically. Monopolized by American 'Corning' company and Japan's 'NGK' company, not only the cost of each set is 7,000 to 12,000 yuan, but also, it is most likely to block and fail, which becomes an obstacle to popularization and application.

The essence of DOC post-processor technology is similar to the three-way catalytic converter (TWC) of gasoline passenger cars, which is used to remove CO and HC in exhaust gas. The carrier and catalyst technology are relatively mature, can be localized, and the price is low. efficient. However, after being applied to diesel vehicles, since the main object of treatment is PM, the removal efficiency of PM is only 10-30%. Therefore, the low efficiency has become an obstacle to popularization and application.

The essence of POC post-processing technology is to 'filter' or 'retain' PM first, and then oxidize it under the action of a catalyst to partially oxidize SOF, the main component in PM, into CO2 and H2O, reduce the particle size of PM, and eliminate Its toxicity and hazard factors, therefore, solve the essential problem of PM exceeding the standard. The processing efficiency of POC post-processor to PM can reach 50-80%, and the failure rate of being blocked is far lower than that of DPF. Therefore, POC is a hotspot of foreign research, among which Ecocat is the most representative.

The essence of the POC post-processor is the combination of advanced carrier and catalyst technologies. Among them, the carrier is the most critical, not only affecting performance, but also affecting cost and life.

Ecocat's POC carrier is its patented technology, and its essence is a combination of uniquely structured metal honeycomb panels and ultrafine metal fiber textile felts. But the price is high, and domestic diesel vehicles cannot be adopted in large quantities.

The POC carrier becomes the key to the application of the POC post-processor. Some 'honeycomb plates and their combinations' made of ultra-thin heat-resistant stainless steel plates, for example, the 'three-way purifier metal carrier' patent with the patent number '02241118.6'; the 'motor vehicle three The corrugated belt of the metal carrier of the elemental catalytic converter and its metal carrier' patent; the patent of 'exhaust gas purification metal carrier and laminated exhaust gas purification filter' with the patent number of '200810091662.9'; the patent of '200610114608.2' Automobile exhaust metal carrier three-way catalytic converter' patent; patent number '200480036580.4' patent for 'manufacturing method of exhaust gas purification metal carrier, exhaust gas purification metal carrier and exhaust gas purification filter' patent; patent number '200710003694.4' for 'metal Carrier and metal carrier manufacturing method' patent; patent number '99201749.1' for 'metal carrier for motor vehicle exhaust purification catalyst'; patent number '00268303.2' for 'honeycomb metal carrier' patent; patent number '00243739.2' "Metal carrier for external three-way catalytic converter" patent; patent number "02202495.6" for "metal carrier for exhaust emission control"; patent number "200410022788.2" for "new metal carrier for ceramic treatment" Patents; Patent No. '98125354.7' of 'Metal Support for Catalysts'; Patent No. '03208434.X' of 'Honeycomb Metal Support'; Patent No. '99101110.4' of 'A Catalyst with an Alumina Layer' Metal carrier' patent; patent number '98119279.3' for 'metal carrier for internal combustion engine exhaust system'; patent number '00100560.X' for 'metal carrier for exhaust gas purification'; patent number '01111387.1' Patents of 'Metal Carrier Catalyst for Exhaust Gas Purification', etc., because the gas mass transfer and heat transfer channels are through-type or equivalent to through-type, therefore, the treatment effect on PM is not good, and cannot be applied to POC after-treatment devices.

Some patents use metal wires to cross weave into a flat metal mesh, and then stack these mesh sheets together, such as the 'net ceramic carrier' patent with the patent number '98248772.X'; Patent No. '200710010357.8' for 'Honeycomb Metal Mesh Carrier for Catalytic Reduction of Nitrogen Oxides'; Patent No. '200710010359.7' for 'A Honeycomb Wire Mesh with Aluminum Oxide Coating Carrier and its preparation method'patent; patent number '200810011365.9' patent 'method for coating aluminum oxide coating on honeycomb wire mesh carrier'patent; patent number '200810011366.3''honeycomb metal for purifying exhaust gas Screen carrier'patent; Patent No. '200420094705.6''Surface Loaded Nano TiO ₂ Metal Filter' patent, etc., because the gas mass transfer and heat transfer channels are similar to through-type, the degree of air flow channel disorder is not high , the probability of PM particles being collided and trapped is not high, therefore, the treatment effect on PM is not good, and it cannot be applied to POC post-processing devices.

Some patents use complete metal foam as post-processing metal carrier. Although the above problems are solved, it can be applied to small-scale occasions, but facing the disadvantage of cost, it cannot be applied to mass production of automobiles, and the structure of the carrier unit needs to be improved. , in the case of ensuring performance, reduce costs, such as the patent of 'composite photocatalytic antibacterial metal foam' with patent number '200320119469.4'; patent number '200610156330.5' of 'a preparation method of a high-porosity metal porous carrier material' Patents; Patent No. '200510024944.3' on 'Metal Carrier for Automobile Exhaust Purifier Catalyst and Its Preparation Method'; Patent No. '200410096609.X' on 'A Metal Foam Hydrogenation Catalyst and Its Preparation Method and Application'; Patent No. '200710034317.7', 'a porous metal carrier and its preparation method' patent and so on.

Invention content:

The purpose of this utility model is to provide a kind of special-shaped POC metal carrier post-processor with a buffer gap at the outlet of three kinds of substrates, which includes foam metal cake-A-type carrier, metal mesh cake-B-type carrier and single-layer wire mesh and 3 The stacking combination of the former has high mechanical strength, and the exhaust smoke of the engine is reduced by 39-61%; there is no back pressure problem; in the case of equivalent performance, the price is equivalent to 1/4-1/5 of imported products ,save costs.

The technical scheme of the utility model is realized in this way: three types of special-shaped POC metal carrier post-processors with buffer gaps at the outlet of the substrate, the intake pipe exhausted by the engine, the intake expansion pipe, the connecting flange, and the foam metal cake-A type Carrier, wire mesh cake-B-type carrier, carrier shell, air outlet expansion pipe, air outlet pipe, retaining ring for fixing the carrier cake, single-layer wire mesh and pressure sensor; it is characterized in that: the carrier is made of foamed metal cake and single-layer The cakes composed of wire mesh and iron-chromium-aluminum wire mesh are arranged alternately. The inlet and outlet of the metal carrier are both metal foam cakes-A-type carrier; the outlet end is provided with a buffer gap completely composed of metal foam cakes; the metal foam cake- A-type carrier, metal mesh cake-B-type carrier and single-layer wire mesh are coated with oxidation catalyst coating; foam metal cake on both sides of the buffer gap and the inlet and outlet-A-type carrier top with a metal retaining ring with the shell Welding fixed.

The shell is single-layer or with insulation layer, and the shell material is SUS441 ferritic stainless steel or St11 ordinary steel plate with aluminized surface; the inlet and outlet of the carrier are respectively connected with the air inlet or outlet expansion pipe.

Metal foam cake-type A carrier is a foam material composed of foamed nickel, foamed nickel-chromium, foamed nickel-chromium-aluminum, foamed iron-chromium-aluminum, foamed iron-chrome, etc. , the thickness is 2.5mm ~ 150mm.

Metal mesh cake-type B carrier is a gas-liquid filter mesh woven by iron-chromium-aluminum wire with a wire diameter of 0.2-0.6mm, the thickness is 2.5mm-150mm, and the diameter is the same as that of type A carrier.

The single-layer wire mesh is iron-chromium-aluminum wire with a wire diameter of 0.5-1mm, which is woven into a single-layer wire mesh with a per-inch air-permeable hole number of 15-65ppi; the diameter of the single-layer wire mesh is the same as that of the A-type carrier.

The carrier is based on metal foam cake-A carrier, cake-B-type carrier composed of iron-chromium-aluminum wire mesh, single-layer wire mesh, cake-B-type carrier composed of iron-chromium-aluminum wire mesh, single-layer wire mesh, iron The cake-B type carrier composed of chromium-aluminum wire mesh, the metal foam cake-A type carrier, the buffer gap, and the metal foam cake-A type carrier are sequentially installed in the carrier shell.

The metal foam cake-type A carrier is placed on both sides of the cake-type B carrier composed of iron-chromium-aluminum wire mesh, and the single-layer wire mesh is placed in the middle of the cake-type B carrier composed of iron-chromium-aluminum wire mesh.

The outlet end of the carrier is provided with a buffer gap D whose size is 1/4-1/8 of the inner diameter of the POC processor.

The end of the A-type carrier used for the inlet and outlet of the carrier is welded and fixed with a retaining ring.

The positive effect of the utility model is that the price is equivalent to 1/4 to 1/5 of the price of imported products, and has technical and economic competitiveness.

Description of drawings:

Fig. 1 is the structural representation of the utility model.

Detailed ways:

Below in conjunction with accompanying drawing 1, the utility model is further described: as shown in Figure 1, three kinds of substrate outlets have the special-shaped POC metal carrier postprocessor of buffer gap, by the intake pipe 1 of engine exhaust, intake expansion pipe 2, Connecting flange 3, metal foam cake-A-type carrier 4, wire mesh cake-B-type carrier 5, carrier shell 6, air outlet expansion pipe 7, air outlet pipe 8, retaining ring for fixing carrier cake 9, single-layer wire mesh 10 and a pressure sensor 11; it is characterized in that: the carrier is composed of metal foam cake 4 and cake 5 composed of single-layer wire mesh 10 and iron-chromium-aluminum wire mesh alternately arranged, and the inlet and outlet of the metal carrier are metal foam cake- A-type carrier 4; the outlet end is provided with a buffer gap that is completely made of metal foam cake; metal foam cake-A-type carrier 4, metal mesh cake-B-type carrier 5 and single-layer wire mesh 10 are all coated with oxidation catalyst coating layer; both sides of the buffer gap and the metal foam cake-A type carrier 4 at the inlet and outlet are welded and fixed with the shell by a metal retaining ring.

The shell is single-layer or with insulation layer, and the shell material is SUS441 ferritic stainless steel or St11 ordinary steel plate with aluminized surface; the inlet and outlet of the carrier are respectively connected with the air inlet or outlet expansion pipe.

Foamed metal cake-type A carrier 4 is a foam made of nickel foam, nickel-chromium foam, nickel-chromium-aluminum foam, iron-chromium-aluminum foam, iron-chromium foam, etc. Material, the thickness is 2.5mm ~ 150mm.

The wire mesh cake-type B carrier 5 is a gas-liquid filter net woven by iron-chromium-aluminum wires with a wire diameter of 0.2-0.6mm, the thickness is 2.5mm-150mm, and the diameter is the same as that of the A-type carrier 4.

The single-layer wire mesh 10 is FeCrAl wire rod with a wire diameter of 0.5-1 mm, which is woven into a single-layer wire mesh 10 with air-permeable holes per inch of 15-65 ppi; the diameter of the single-layer wire mesh 10 is the same as that of the A-type carrier 4 .

The carrier is based on metal foam cake-A carrier 4, cake composed of iron-chromium-aluminum wire mesh-B-type carrier 5, single-layer wire mesh 10, cake-B-type carrier composed of iron-chromium-aluminum wire mesh 5, single layer Screen 10, iron-chromium-aluminum wire mesh cake-B-type carrier 5, metal foam cake-A-type carrier 4, buffer gap, foam metal cake-A-type carrier 4 are sequentially installed in the carrier shell 6.

Foam metal cake-A-type carrier 4 is placed on both sides of the cake-B-type carrier 5 composed of iron-chromium-aluminum wire mesh, and the single-layer wire mesh 10 is placed in the middle of the cake-B-type carrier 5 composed of iron-chromium-aluminum wire mesh .

The outlet end of the carrier is provided with a buffer gap D whose size is 1/4-1/8 of the inner diameter of the POC processor.

The end of the used A-type carrier 4 of the import and export of the carrier is welded and fixed with the retaining ring 9.

When in use, firstly select a foamed nickel-chromium-iron-iron sheet with a per-inch air-permeable hole number of 35ppi and a hole density greater than 90%. The cake has a diameter of 300mm and a cake thickness of 15mm, and undergoes the degreasing and degreasing process of the alkaline medium respectively; Burn at 650-750°C for 2 hours; transfer to a treatment solution containing 0.5% HCl and 0.2% Cr(NO3)2 for 4 hours; first rinse with tap water twice, then rinse twice with distilled water; 110°C Dry for 2 hours; apply the catalyst coatings of the following materials and ratios in turn to complete sintering. The ratio of the coating is 1 part of Al2O3, 0.2 parts of TiO2, 0.04 parts of La2O3, 0.1 parts of CeO2, and 0.06 parts of Cr2O3; The sintering temperature of the layer is 250-550° C., and the time is 2-3 hours. Processed into metal foam cake with catalyst-type A carrier (4).

The material is iron-chromium-aluminum, gas-liquid filter with a wire diameter of 0.4 mm, cut into wire pieces with a diameter of 300 mm and a thickness of 15 mm, stacked, edge-sealed, and degreased by alkaline media; and then Insulate at 650-750°C for 2 hours; transfer to a treatment solution containing 0.5% HCl and 0.2% Cr(NO3)2 for 4 hours; first rinse with tap water twice, then rinse twice with distilled water, and dry at 110°C 2 hours; apply the catalyst coatings of the following materials and ratios in turn, and complete the sintering. The ratio of the coating is 1 part of Al2O3, 0.2 parts of TiO2, 0.04 parts of La2O3, 0.1 part of CeO2, and 0.06 parts of Cr2O3; The sintering temperature is 250-550°C, and the time is 2-3 hours. Processed into a catalyst-carrying wire mesh cake-type B carrier (5).

Select iron-chromium-aluminum wire with a wire diameter of 1mm, and weave it into a wire mesh with air permeable holes of 15-65ppi per inch; Insulate for 2 hours under the condition of ℃; transfer to the treatment solution containing 0.5% HCl and 0.2% Cr(NO3) 2 for 4 hours; first rinse with tap water for 2 times, then rinse with distilled water for 2 times; dry at 110°C for 2 hours; Coat the catalyst coating of following material and ratio, finish sintering, the ratio of coating is the Al2O3 of 1 part, the TiO2 of 0.2 part, the La2O3 of 0.04 part, the CeO2 of 0.1 part, the Cr2O3 of 0.06 part; The sintering temperature of coating is 250～550℃, the time is 2～3 hours. Processed as a single layer wire mesh 10 with catalyst.

The selected material is a SUS44 stainless steel plate material, the plate thickness is 1.5mm, the welding inner diameter is 302mm, and the length is 480mm. The garden barrel-shaped carrier shell 6 .

Complete the retaining ring 9 welding of fixed carrier cake at the outlet end of garden barrel shape carrier shell 6.

First, put a layer of metal foam cake-A-type carrier 4 cake above the retaining ring in the bucket to complete the filling of the first segment of carrier; place the carrier vertically, and place a diameter A flat steel plate with a diameter of 10 to 20 mm smaller than the A-type carrier 4, and then place a 10-kilogram metal weight on it to make the entire carrier densely stacked, reduce gaps and radial movement, and complete the welding of the retaining ring 9; The metal foam cake-A-type carrier 4 is welded with the second retaining ring 9 at 6 mm above the retaining ring, and a layer of metal foam cake-A-type carrier 4 cake is placed on the top of the retaining ring, and a specified number of wire mesh cakes- B-type carrier 5 and single-layer wire mesh 10, finally put into one layer of foamed metal cake-A-type carrier 4, complete the filling of the second stage carrier; Place a diameter smaller than A-type carrier on the surface of the A-type carrier 4 at the top 4. A flat steel plate with a diameter of 10-20 mm, and then place a 10 kg metal weight on it to make the entire carrier stack dense, reduce gaps and radial movement, and complete the welding of the retaining ring 9 at the inlet end.

Complete the welding of the outlet expansion pipe 7, the outlet pipe 8, the intake pipe 1, the intake expansion pipe 2, the connecting flange 3 and the installation of the pressure sensor 11 in order, and complete the manufacturing and processing of the POC metal carrier post-processor.

Claims (9)

1, the outlet of three kinds of matrixes has the special-shaped POC metallic carrier preprocessor of buffer gap, is made up of ring washer (9), individual layer silk screen (10) and the pressure transducer (11) of the suction tude (1) of engine exhaust, air inlet expanding duct (2), adpting flange (3), foam metal cake-A type carrier (4), wire gaze cake-Type B carrier (5), carrier housing (6), the expanding duct of giving vent to anger (7), steam outlet pipe (8), immobilization carrier cake; It is characterized in that: the cake (5) that carrier is made up of foam metal cake (4) and individual layer silk screen (10) and iron-chromium-aluminum metal silk screen alternately rearranges, and the import of metallic carrier and outlet are foam metal cake-A type carrier (4); Outlet end is provided with the buffer gap that is made of the foam metal cake fully; Foam metal cake-A type carrier (4), wire gaze cake-Type B carrier (5) and individual layer silk screen (10) all apply the oxidation catalyst coating; The foam metal cake of both sides, buffer gap and import and outlet-A type carrier (4) top is fixing with the housing welding with metal collar.

2, three kinds of matrixes outlet according to claim 1 has the special-shaped POC metallic carrier preprocessor of buffer gap, it is characterized in that described housing be individual layer or band thermal insulation layer housing, case material is the St11 general steel plate of aluminizing in SUS441 Ferritic Stainless Steel or surface; The import of carrier connects with the air inlet or the expanding duct of giving vent to anger respectively mutually with outlet.

3, three kinds of matrixes outlet according to claim 1 has the special-shaped POC metallic carrier preprocessor of buffer gap, it is characterized in that described foam metal cake-A type carrier (4) is the ventilative hole count 15～65ppi of per inch, the density in hole is greater than the foamed material of compositions such as 90% foamed nickel, foam nickel chromium triangle, foam nickel chromium triangle aluminium, bubble iron chromium aluminum, bubble iron chromium, and thickness is 2.5mm～150mm.

4, three kinds of matrixes outlet according to claim 1 has the special-shaped POC metallic carrier preprocessor of buffer gap, it is characterized in that described wire gaze cake-Type B carrier (5) is a gas-liquid filter net that the Fe-Cr-Al wire that directly is 0.2～0.6mm is made into, thickness is 2.5mm～150mm, and diameter is identical with A type carrier (4).

5, three kinds of matrixes outlet according to claim 1 has the special-shaped POC metallic carrier preprocessor of buffer gap, it is characterized in that described individual layer silk screen (10) for the silk footpath is the siderochrome aluminium wire of 0.5～1mm, is woven into the individual layer silk screen (10) of the ventilative hole count 15～65ppi of per inch; Individual layer silk screen (10) diameter is identical with A type carrier (4).

6, three kinds of matrixes outlet according to claim 1 has the special-shaped POC metallic carrier preprocessor of buffer gap, it is characterized in that described carrier is to be installed in the carrier housing (6) by cake-Type B carrier (5) and foam metal cake-A type carrier (4), buffer gap, foam metal cake-A type carrier (4) order that cake-Type B carrier (5), individual layer silk screen (10), iron-chromium-aluminum metal silk screen that cake-Type B carrier (5), individual layer silk screen (10), iron-chromium-aluminum metal silk screen that foam metal cake-A type carrier (4), iron-chromium-aluminum metal silk screen are formed are formed are formed.

7, three kinds of matrixes outlet according to claim 1 has the special-shaped POC metallic carrier preprocessor of buffer gap, it is characterized in that described foam metal cake-A type carrier (4) is placed on the both sides of the cake-Type B carrier (5) of iron-chromium-aluminum metal silk screen composition, individual layer silk screen (10) is placed on the centre of the cake-Type B carrier (5) of iron-chromium-aluminum metal silk screen composition.

8, three kinds of matrixes outlet according to claim 1 has the special-shaped POC metallic carrier preprocessor of buffer gap, and the size that the outlet end that it is characterized in that described carrier is provided with buffer gap D is 1/4～1/8 of a POC processor internal diameter.

9, three kinds of matrixes outlet according to claim 1 has the special-shaped POC metallic carrier preprocessor of buffer gap, it is characterized in that the import of described carrier and the termination that exports used A type carrier (4) are fixing with ring washer (9) welding.

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