CN201401209Y - POC Metal Carrier Post Processor with Buffer Gap at Inlet and Outlet - Google Patents

Abstract

The utility model relates to a POC metal-carrier postprocessor with buffer gaps at the inlet and outlet ends, and is characterized in that a carrier is formed by the overlapping of foam metal cakes; two buffer gaps are arranged at the inlet and outlet of the carrier; foam metal cakes-A-type carriers are coated with oxidation catalysts; and the foam metal cakes-A-type carriers at the inlet, the outlet and in the buffer gaps are all welded and fixed with a casing through metal retaining rings. The postprocessor has very high mechanical intensity, can be applied for assembling export vehicles ofthe vehicle-mounted POC postprocessor, and has no backpressure problem. The exhaust smoke degree of an engine is remarkably reduced. Under the circumstance with comparative performances, the price ofthe postprocessor is half of import products, so that cost is saved.

Description

POC Metal Carrier Post Processor with Buffer Gap at Inlet and Outlet

Technical field:

The utility model relates to a POC metal carrier post-processor with buffer gaps at the inlet and outlet ends, which is applied in the automobile engine industry and meets 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 2007 U.S. Environmental Protection Agency (EPA) 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 the post-processing metal carrier. Although the above problems are solved, they face the disadvantage of cost and cannot be applied to the mass production of automobiles in the domestic market. However, their reliability is high, and the carrier unit needs to be structured. Improvement, in the case of guaranteed performance, lower cost, can be applied to export-oriented vehicles, such as the patent of 'composite photocatalytic antibacterial metal foam' with patent number '200320119469.4'; The patent for the preparation method of metal porous carrier material'; the patent number '200510024944.3' for 'metal carrier for automobile exhaust purifier catalyst and its preparation method'; the patent number '200410096609.X' for 'a metal foam hydrogenation catalyst And its preparation method and application' patent; the patent number of '200710034317.7' is 'a porous metal carrier and its preparation method' patent and so on.

Invention content:

The purpose of this utility model is to provide the metal carrier and post-processing device [13] of POC for diesel vehicles, which is composed of foam metal cake-A type carrier (4) stacked; 2 buffer gaps are set at the inlet and outlet of the carrier ;With high mechanical strength, it is applied to export vehicles equipped with vehicle-mounted POC post-processors, and the exhaust smoke of the engine is significantly reduced; there is no back pressure problem; in the case of equivalent performance, the price is equivalent to 1/2 of imported products, save costs.

The technical scheme of the utility model is realized in this way: the POC metal carrier post-processor with a buffer gap at the inlet and outlet ends, the intake pipe exhausted by the engine, the intake expansion pipe, the connecting flange, the foam metal cake-A type carrier , buffer gap D, carrier shell, air outlet expansion pipe, air outlet pipe, retaining ring for fixing the carrier cake and pressure sensor; it is characterized in that: the carrier is composed of stacked foam metal cakes; two are set at the inlet and outlet of the carrier Buffer gap; the metal foam cake-A carrier is coated with an oxidized catalyst coating; the metal foam cake-A carrier of the inlet and outlet and the buffer gap is welded and fixed with the shell by a metal retaining ring. The shell is single-layer or with insulation layer, and the material of the shell 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 50mm ~ 150mm.

Two buffer gaps are set at the inlet and outlet of the carrier; the size of the buffer gap D is 1/4 to 1/8 of the inner diameter of the POC processor.

The number of the ends of the A-type carrier used for the inlet and outlet of the carrier and the number of retaining rings on both sides of the buffer gap D is 6.

The positive effect of the utility model is that the price of the metal carrier and post-processing device [13] of POC for diesel vehicles is equivalent to 1/2 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, there is the POC metal carrier postprocessor of buffer gap at the inlet and the outlet, connected by the intake pipe 1, the intake expansion pipe 2, of the exhaust of the engine Flange 3, metal foam cake-A type carrier 4, buffer gap D, carrier shell 5, air outlet expansion pipe 6, air outlet pipe 7, retaining ring 8 for fixing carrier cake and pressure sensor 9; it is characterized in that: the carrier is composed of Metal foam cake 4 is stacked; two buffer gaps are set at the inlet and outlet of the carrier; the metal foam cake-A type carrier 4 is coated with an oxidized catalyst coating; the metal foam cake at the inlet and outlet and the buffer gap- The A-type carrier 4 is welded and fixed with the shell by a metal retaining ring. The shell is single-layer or with insulation layer, and the material of the shell 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 thickness is 50mm ~ 150mm.

Two buffer gaps are set at the inlet and outlet of the carrier; the size of the buffer gap D is 1/4 to 1/8 of the inner diameter of the POC processor.

The number of ends of the A-type carrier 4 used for the inlet and outlet of the carrier and the retaining rings 9 on both sides of the buffer gap D are six.

When in use, first 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 diameter of the cake is 300mm, and the thickness of the cake is 150mm, and then go through the degreasing and degreasing process of the alkaline medium; 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; rinse with tap water twice, then rinse twice with distilled water; 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 metal foam cake-A type carrier 4 with catalyst.

The selected material is 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 5 .

Complete the retaining ring 8 welding of the fixed carrier cake at the outlet end of the barrel-shaped carrier shell 5 .

Firstly, above the retaining ring in the barrel, put a specified number of layers of metal foam cake-A-type carrier 4 cake to complete the filling of the first stage of carrier; the carrier is placed vertically and placed on the surface of the uppermost A-type carrier 4 A flat steel plate with a diameter of 10 to 20 mm in diameter smaller than the A-type carrier 4, and then place a 10-kilogram metal weight on it to make the entire carrier stack densely, reduce gaps and radial movement, and complete the welding of the retaining ring 9; then Weld the second retaining ring 9 at 6 mm above the metal foam cake-A-type carrier 4, and put a specified number of layers of metal foam cake-A-type carrier 4 above the retaining ring to complete the filling of the second stage of the carrier The carrier is vertically placed, and a flat steel plate with a diameter of 10-20 mm in diameter smaller than the A-type carrier 4 is placed on the surface of the uppermost A-type carrier 4, and then a 10-kg metal weight is placed on it, so that the entire carrier is stacked. Dense, reduce the gap and radial movement, and complete the welding of the retaining ring 9; then weld the third retaining ring 9 at 6 mm above the metal foam cake-A-type carrier 4, above the retaining ring, put a specified number of layers of foam Metal cake-A-type carrier 4 cakes, complete the filling of the third stage carrier; the carrier is placed vertically, and a flat steel plate with a diameter of 10-20mm smaller than the diameter of the A-type carrier 4 is placed on the surface of the uppermost A-type carrier 4, Then place 10 kilograms of metal weights on it, so that the entire carrier is stacked densely, reducing gaps and radial movement, and completing the welding of the retaining ring 9 at the inlet end.

Complete the welding of the outlet expansion pipe 6, the outlet pipe 7, the intake pipe 1, the intake expansion pipe 2, the connecting flange 3 and the installation of the pressure sensor 9 in order, and complete the manufacturing and processing of the POC metal carrier post-processor.

Claims (5)

1, import and outlet end have the POC metallic carrier preprocessor of buffer gap, are made up of the ring washer (8) and the pressure transducer (9) of the suction tude (1) of engine exhaust, air inlet expanding duct (2), adpting flange (3), foam metal cake-A type carrier (4), buffer gap D, carrier housing (5), the expanding duct of giving vent to anger (6), steam outlet pipe (7), immobilization carrier cake; It is characterized in that: carrier is stacked by foam metal cake (4) to be formed; Import and outlet at carrier are provided with 2 buffer gaps; Foam metal cake-A type carrier (4) is gone up coating oxidation catalyst coating; Foam metal cake import and outlet and the buffer gap-A type carrier (4) adopts metal collar fixing with the housing welding.

2, import according to claim 1 and outlet end have the 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, import according to claim 1 and outlet end have the POC metallic carrier preprocessor of buffer gap, it is characterized in that described foam metal cake-A type carrier (4) is hole count 15～65ppi that per inch is ventilative, the density in hole is 50mm～150mm greater than the foamed material thickness of compositions such as 90% foamed nickel, foam nickel chromium triangle, foam nickel chromium triangle aluminium, bubble iron chromium aluminum, bubble iron chromium.

4, import according to claim 1 and outlet end have the POC metallic carrier preprocessor of buffer gap, it is characterized in that the import of described carrier and outlet are provided with 2 buffer gaps; The size of buffer gap D is 1/4～1/8 of a POC processor internal diameter.

5, import according to claim 1 and outlet end have the POC metallic carrier preprocessor of buffer gap, it is characterized in that the import of described carrier and the quantity of the both sides ring washer (9) of termination that exports the A type carrier (4) that uses and buffer gap D are 6.