CN101629507A - Particulate oxidation catalyst postprocessor using metal carriers with two buffer gaps and preparation process thereof - Google Patents
Particulate oxidation catalyst postprocessor using metal carriers with two buffer gaps and preparation process thereof Download PDFInfo
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- CN101629507A CN101629507A CN200910066913A CN200910066913A CN101629507A CN 101629507 A CN101629507 A CN 101629507A CN 200910066913 A CN200910066913 A CN 200910066913A CN 200910066913 A CN200910066913 A CN 200910066913A CN 101629507 A CN101629507 A CN 101629507A
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Abstract
The invention relates to a particulate oxidation catalyst (POC) postprocessor using metal carriers with two buffer gaps and a preparation process thereof, which is characterized in that the carriers are alternately stacked up in a carrier shell by one or two kinds of substrates, the two buffer gaps are arranged in the carrier shell, and the entrances and the exits of the metal carriers as well as the end faces of the buffer gaps are all provided with foam metal cakes-A type carriers; the carriers are coated by oxidation catalyst coatings; the foam metal cakes-A type carriers at the entrances and the exits as well as on both sides of the buffer gaps are welded and fixed with the carrier shell by metal retaining rings. The carriers have high mechanical strength and ensure the exhaust smoke of the engines to be reduced by 51-72% when being applied to the vehicle POC postprocessors. The postprocessors are free of backpressure; under the condition of equivalent performance, the price is equivalent to 1/4-1/5 of the price of imported products, thus saving the cost.
Description
Technical field:
The present invention relates to the POC metallic carrier preprocessor and the preparation process of two buffer gaps, be applied to the motor car engine industry, satisfied the environmental protection standard requirement of Europe more than 4.
Background technique:
Harmful components in the automobile engine to exhaust mainly are PM, NOX, HC and CO etc.In 2～3 years, low emission level engine has become people's arguement, has been concerned about even has thirsted for an ideal of realization in the past.
The 2007 emission regulation demands automakers of American National Environmental Protection Agency (EPA) reduce particle (PM) and the two kinds of main pollutants of nitrogen oxide (NOX) in the vehicle exhaust simultaneously.This needs suitable skill, and what shortcut addresses this problem does not have to walk.By traditional method, reduce a kind of pollution and certainly will cause another kind of increase of polluting.As if the automaker be absorbed in predicament.
Under the pressure of Abgasgesetz, diesel engine for automobile just constantly carries out technology upgrading and improvement on the one hand, on the other hand, selects appropriate post-processing technology strategy and equipment, and for example, Europe 4 or Europe 5 emission standards are satisfied in reprocessing measures such as SCR, DPF, DOC, POC.
The essence of SCR preprocessor technology is to utilize urea at high temperature to decomposite NH
3, as the NH of reducing agent
3React under the comprehensive function of catalyzer and temperature with the NOX in the engine exhaust, generate nontoxic N under the desirable operating mode
2And H
2O, thus reach the purpose of purification.But the complex structure of SCR after-treatment system, the cost of every cover becomes the obstacle of applying at 11000 yuan～25000 yuan.
The essence of DPF preprocessor technology is to utilize a kind of special carrier, for example the honeycomb hole of import and outlet end replaces ' wall stream ' formula pottery or the Carboround after the shutoff, the filter efficiency of ' black smoke ' of PM one class that fresh DPF preprocessor exemplar is discharged diesel-oil vehicle is the highest can to reach 90%, new car dispatches from the factory to detect and can reach Europe 4 or Europe 5 emission standards fully, but, costing an arm and a leg of this ceramic DPF carrier, can't be homemade, all monopolized in the world wide by ' NGK ' house journal of ' Corning ' company of the U.S. and Japan, not only the cost of every cover is at 7000 yuan～12000 yuan, and the easiest obstruction was lost efficacy, and became the obstacle of applying.
The essence of DOC preprocessor technology is the three-way catalytic converter (TWC) that is similar to the gasoline passenger car, is used for removing CO and HC in the tail gas, and carrier and catalyst technology comparative maturity all can domesticize, and price is low, the efficient height.But after being applied to diesel-oil vehicle, because the main object of its main processing is PM, only 10～30%, therefore, efficient is low, becomes the obstacle of applying to the removal efficient of PM.
The essence of POC preprocessor technology is earlier PM ' filtration ' or ' holding back ' get off, under the effect of catalyzer, carry out oxidation then, main component SOF partial oxygen among the PM is changed into CO2 and H2O, the PM particle size is reduced, eliminate the factor of its toxicity and harm, therefore, solved the essential problem that PM exceeds standard.The POC preprocessor can reach 50～80% to the treatment effeciency of PM, and blocked rate of fault is also well below DPF.Therefore, POC is the focus of foreign study, and is wherein, the most representative with Ecocat company.
The essence of POC preprocessor is advanced person's the carrier and the combination of catalyst technology.Wherein, carrier is the most key, not only influences performance, also influences cost and life-span.
The POC of Ecocat company carrier is its patented technology, and its essence is the metal honeycomb plate of structure uniqueness and the assemblying body of ultrafine metal fibers weaving felt.But cost an arm and a leg, homemade diesel-oil vehicle can not adopt in enormous quantities.
The POC carrier becomes POC preprocessor key in application.Some utilize some that the ultra thin high temperature resistant corrosion resistant plate makes ' Cellular board with and combination ', and for example, the patent No. is ' ternary cleaner metallic carrier ' patent of ' 02241118.6 '; The patent No. is ' corrugated ribbon and the metallic carrier thereof of Motor Vehicle ternary catalyst purifier metallic carrier ' patent of ' 200720088652.0 '; The patent No. is ' exhaust gas purifying metal carrier, use laminate exhaust gas purifying filter ' patent of ' 200810091662.9 '; The patent No. is ' a kind of method for making automobile tail gas three-element catalytic device with metal carrier ' patent of ' 200610114608.2 '; The patent No. is ' manufacture method of exhaust gas purifying metal carrier, exhaust gas purifying metal carrier and exhaust emission control filter ' patent of ' 200480036580.4 '; The patent No. is ' manufacture method of metallic carrier and metallic carrier ' patent of ' 200710003694.4 '; The patent No. is ' metallic carrier of motor vehicle vent gas purification catalysis agent ' patent of ' 99201749.1 '; The patent No. is ' honeycomb metal carrier ' patent of ' 00268303.2 '; The patent No. is ' metallic carrier of the outer ternary catalyst purifier of machine ' patent of ' 00243739.2 '; The patent No. is ' metallic carrier that is used for toxic emission control ' patent of ' 02202495.6 '; The patent No. is ' metallic carrier of new ceramics processing ' patent of ' 200410022788.2 '; The patent No. is ' metallic carrier for catalyst ' patent of ' 98125354.7 '; The patent No. is ' 03208434.X's ' ' honeycomb metal carrier ' patent; The patent No. is ' a kind of catalyst metal carrier with alumina layer ' patent of ' 99101110.4 '; The patent No. is ' metallic carrier that is used for internal combustion engine exhaust system ' patent of ' 98119279.3 '; The patent No. is ' 00100560.X's ' ' metal carrier for purifying waste gas ' patent; The patent No. is ' metal carrier catalyst that is used for waste-gas cleaning ' patent of ' 01111387.1 ' or the like, because the mass transfer of gas and the passage of heat transfer are through or are equal to perforation, therefore, bad to the treatment effect of PM, can't be applicable to the POC after-treatment device.
Some patents adopt wire cross to be woven into the wire netting on plane, these net sheets are stacked together again, and for example the patent No. is ' netted ceramic monolith ' patent of ' 98248772.X '; The patent No. is ' netted ceramic monolith ' patent of ' 99253757.6 '; The patent No. is ' Cellulated wiremesh carrier of catalyzing and reducing nitrogen oxides ' patent of ' 200710010357.8 '; The patent No. is ' a kind of Cellulated wiremesh carrier with aluminum oxide coating layer and preparation method thereof ' patent of ' 200710010359.7 '; The patent No. is ' method of covering aluminum oxide coating on honeycomb shaped wire mesh carrier ' patent of ' 200810011365.9 '; The patent No. is ' Cellulated wiremesh carrier that is used for purifying exhaust air ' patent of ' 200810011366.3 '; The patent No. is ' 200420094705.6 ' ' area load nano-TiO
2Metal screen ' patent or the like, because the passage of the mass transfer of gas and heat transfer is to be similar to throughly, the degree of air-flow path disorder is not high, the probability that the PM particle is collided and holds back is not high, therefore, bad to the treatment effect of PM, can't be applicable to the POC after-treatment device.
Some patents adopt complete foam metal as the post-treating metal carrier, though solved the problems referred to above, can be applied to small-scale occasion, but face the inferior position of cost, can't be applied to the production in enormous quantities of automobile, for example the patent No. is ' composite photocatalyst antimicrobial spume metal ' patent of ' 200320119469.4 '; The patent No. is ' a kind of preparation method of high porosity metal porous carrier materials ' patent of ' 200610156330.5 '; The patent No. is ' metal carrier for automobile tail gas purifier catalyst and preparation method thereof ' patent of ' 200510024944.3 '; The patent No. is ' 200410096609.X's ' ' a kind of foam metal hydrogenating catalyst and its production and application ' patent; The patent No. is ' a kind of Lacunaris metal carrier and preparation method thereof ' patent of ' 200710034317.7 ' or the like.
Summary of the invention:
The object of the present invention is to provide the POC metallic carrier preprocessor and the preparation process of two buffer gaps, it comprises foam metal cake-A type carrier, or foam metal cake-A type carrier and wire gaze cake-Type B carrier stack combination continuously; It has very high mechanical strength, is applied to vehicle-mounted POC preprocessor, and the engine exhaust smoke intensity reduces by 51～72%; No back pressure problems; Under the suitable situation of performance, price is equivalent to 1/4～1/5 of imported product, saves cost.
Technological scheme of the present invention is achieved in that the POC metallic carrier preprocessor and the preparation process of two buffer gaps, is made up of and pressure transducer the ring washer of the suction tude of engine exhaust, air inlet expanding duct, adpting flange, carrier, carrier housing, the expanding duct of giving vent to anger, steam outlet pipe, immobilization carrier cake; It is characterized in that: carrier is stacked alternately in the carrier housing by one or both matrixes, and is provided with two buffer gaps in the carrier housing, and the import of metallic carrier and outlet and buffer gap are foam metal cake-A type carrier; Coating oxidation catalyst coating on the carrier; Foam metal cakes import and outlet and end face both sides, buffer gap-A type carrier is fixing with metal collar and the welding of carrier housing.
The described carrier of being made up of a kind of matrix is foam metal cake-A type carrier, import and outlet are provided with the buffer gap, arrange and are installed in the carrier housing by foam metal cake-A type carrier, buffer gap, foam metal cake-A type carrier, buffer gap, foam metal cake-A type vector sequence.
Described carrier is made up of two kinds of matrix foam metal cake-A type carriers and wire gaze cake-Type B carrier, and two buffer gaps are arranged and are installed in the carrier housing by foam metal cake-A type carrier, buffer gap, foam metal cake-A type carrier, wire gaze cake-Type B carrier, foam metal cake-A type carrier, wire gaze cake-Type B carrier, foam metal cake-A type carrier, buffer gap, foam metal cake-A type vector sequence.
Described carrier is made up of two kinds of matrix foam metal cake-A type carriers and wire gaze cake-Type B carrier, the export and import place is provided with the buffer gap respectively, arranges and is installed in the carrier housing by foam metal cake-A type carrier, wire gaze cake-Type B carrier, foam metal cake-A type carrier, buffer gap, foam metal cake-A type carrier 4, wire gaze cake-Type B carrier 5, foam metal cake-A type carrier, buffer gap, foam metal cake-A type carrier, wire gaze cake-Type B carrier, foam metal cake-A type vector sequence.
The preparation process of POC metallic carrier preprocessor is as follows:
1. body material is prepared: at first select the ventilative hole count 35ppi of per inch, the density in hole is greater than 90% foam sheet, and the diameter of cake is 300mm, and the thickness of cake is 2.5mm～150mm; Selecting the silk footpath is the siderochrome aluminium gas-liquid filter net of 0.4mm, and cutting into diameter is 300mm, and thickness is the silk sheet of 15mm, stacks edge sealing;
2. chemical treatment: to above-mentioned body material, through the oil removing degreasing process of alkaline medium; Under 650～750 ℃ condition, be incubated 2 hours then; Immigration contains 0.5%HCl and 0.2%Cr (NO
3)
2Treatment fluid in handled 4 hours; Earlier, use distilled water flushing again 2 times, 110 ℃ of dryings 2 hours with tap water flushing 2 times; Apply the catalyst coat of following material and ratio successively, ratio is 1 part Al
2O
3, 0.2 part TiO
2, 0.04 part La
2O
3, 0.1 part CeO
2, 0.06 part Cr
2O
3Carry out sintering after coating is finished, the sintering temperature of its coating is 250～550 ℃, and the time is 2～3 hours; Process the body material that has catalyzer;
3. the combination of body material and assembling: chosen material is a SUS44 corrosion resistant plate material, and plate thickness is 1.5mm, and the welding internal diameter is 302mm, and length is 480mm garden tubbiness carrier housing; Finish the ring washer welding of immobilization carrier cake at the outlet end of garden tubbiness carrier housing; Promptly above the ring washer of elder generation in bucket, put into one deck foam metal cake-A type carrier cake, finish the welding of ring washer; Second ring washer of 6mm place welding above this foam metal cake-A type carrier above the ring washer, put into the foam metal cake-A type carrier cake of the regulation number of plies then, finishes the welding of ring washer; The 3rd ring washer of 6mm place welding above this foam metal cake-A type carrier above the ring washer, put into the foam metal cake-A type carrier cake of one deck then, finishes the welding of ring washer; Before the ring washer welding of each entrance point, this carrier is vertically put, on A type carrier surface topmost, place the plane steel plate of a diameter less than this carrier diameter 10～20mm, place 10 kilograms metal counterweight then thereon, it is closely knit that whole carrier is stacked, reduce the space and move radially, finish the welding of ring washer;
4. finish the welding of the expanding duct of giving vent to anger, steam outlet pipe, suction tude, air inlet expanding duct, adpting flange and pressure transducer more in order.
Foam metal cake-A type carrier is foamed nickel, foam nickel chromium triangle, foam nickel chromium triangle aluminium, bubble iron chromium, bubble iron chromium aluminum, bubble iron chromium material.The diameter of wire gaze cake-Type B carrier is identical with foam metal cake-A type carrier.
Good effect of the present invention be price be equivalent to the imported product price 1/4～1/5, possess the competitive ability of technology and economic aspect.
Description of drawings:
Fig. 1 is the structural representation of three kinds of matrixes for the carrier of two buffer gaps of the present invention;
Fig. 2 is another example structure schematic representation of three kinds of matrixes of the present invention;
Fig. 3 is another example structure schematic representation of three kinds of matrixes of the present invention;
Embodiment:
The present invention will be further described below in conjunction with drawings and Examples:
Embodiment 1:
Body material is prepared: at first select the ventilative hole count 35ppi of per inch, the density in hole is greater than 90% foam sheet, and the diameter of cake is 300mm, and the thickness of cake is 2.5mm～150mm; Selecting the silk footpath is the siderochrome aluminium gas-liquid filter net of 0.4mm, and cutting into diameter is 300mm, and thickness is the silk sheet of 15mm, stacks edge sealing; Selecting the silk footpath again is the siderochrome aluminium wire of 0.5～1mm, is woven into the individual layer silk screen of the ventilative hole count 15～65ppi of per inch;
Embodiment 2:
Chemical treatment: to above-mentioned body material, through the oil removing degreasing process of alkaline medium; Under 650～750 ℃ condition, be incubated 2 hours then; Immigration contains 0.5%HCl and 0.2%Cr (NO
3)
2Treatment fluid in handled 4 hours; Earlier, use distilled water flushing again 2 times, 110 ℃ of dryings 2 hours with tap water flushing 2 times; Apply the catalyst coat of following material and ratio successively, ratio is 1 part Al
2O
3, 0.2 part TiO
2, 0.04 part La
2O
3, 0.1 part CeO
2, 0.06 part Cr
2O
3Carry out sintering after coating is finished, the sintering temperature of its coating is 250～550 ℃, and the time is 2～3 hours; Process the body material that has catalyzer;
Embodiment 3:
As shown in Figure 1, the described carrier of being made up of a kind of matrix is foam metal cake-A type carrier 4, import and outlet are provided with the buffer gap, arrange and are installed in the carrier housing 6 by foam metal cake-A type carrier 4, buffer gap and foam metal cake-A type carrier 4, buffer gap and foam metal cake-A type carrier 4 orders; , the import of metallic carrier and outlet and buffer gap are foam metal cake-A type carrier 4; Coating oxidation catalyst coating on the carrier; Foam metal cakes import and outlet and end face both sides, buffer gap-A type carrier 4 usefulness metal collar 9 are fixing with 6 welding of carrier housing.
Chosen material is a SUS44 corrosion resistant plate material, and plate thickness is 1.5mm, and the welding internal diameter is 302mm, and length is 480mm garden tubbiness carrier housing 6; Finish ring washer 9 welding of immobilization carrier cake at the outlet end of garden tubbiness carrier housing 6;
Above the ring washer in bucket, put into-layer foam metal cake-A type carrier 4 cakes earlier, finish the welding of ring washer 9; Second ring washer 9 of 6mm place welding above this foam metal cake-A type carrier 4 above the ring washer, put into foam metal cake-A type carrier 4 cakes of the regulation number of plies then, finishes the welding of ring washer 9; The 3rd ring washer 9 of 6mm place welding above this foam metal cake-A type carrier 4 above the ring washer, put into foam metal cake-A type carrier 4 cakes of one deck then, finishes the welding of ring washer 9; Before ring washer 9 welding of each entrance point, this carrier is vertically put, on A type carrier 4 surfaces topmost, place the plane steel plate of a diameter less than this carrier diameter 10～20mm, place 10 kilograms metal counterweight then thereon, it is closely knit that whole carrier is stacked, reduce the space and move radially, finish the welding of ring washer 9;
Finish the welding of the expanding duct 7 of giving vent to anger, steam outlet pipe 8, suction tude 1, air inlet expanding duct 2, adpting flange 3 and pressure transducer 10 more in order.
Embodiment 4:
As shown in Figure 2, described carrier is made up of two kinds of matrix foam metal cakes-A type carrier 4, wire gaze cake-Type B carrier 5, and two buffer gaps are arranged and are installed in the carrier housing 6 by foam metal cake-A type carrier 4, buffer gap, foam metal cake-A type carrier 4, wire gaze cake-Type B carrier 5, foam metal cake-A type carrier 4, wire gaze cake-Type B carrier 5, foam metal cake-A type carrier 4, buffer gap, foam metal cake-A type carrier 4 orders; The import of metallic carrier and outlet and buffer gap are foam metal cake-A type carrier 4; Coating oxidation catalyst coating on the carrier; Foam metal cakes import and outlet and end face both sides, buffer gap-A type carrier 4 usefulness metal collar 9 are fixing with 6 welding of carrier housing.
Chosen material is a SUS44 corrosion resistant plate material, and plate thickness is 1.5mm, and the welding internal diameter is 302mm, and length is 480mm garden tubbiness carrier housing 6; Finish ring washer 9 welding of immobilization carrier cake at the outlet end of garden tubbiness carrier housing 6;
Above the ring washer in bucket, put into one deck foam metal cake-A type carrier 4 cakes earlier, finish the welding of ring washer 9; Second ring washer 9 of 6mm place welding above this foam metal cake-A type carrier 4 above the ring washer, put into foam metal cake-A type carrier 4 cakes and the wire gaze cake-Type B carrier 5 of the regulation number of plies then, finishes the welding of ring washer 9; The 3rd ring washer 9 of 6mm place welding above this foam metal cake-A type carrier 4 above the ring washer, put into foam metal cake-A type carrier 4 cakes of one deck then, finishes the welding of ring washer 9; Before ring washer 9 welding of each entrance point, this carrier is vertically put, on A type carrier 4 surfaces topmost, place the plane steel plate of a diameter less than this carrier diameter 10～20mm, place 10 kilograms metal counterweight then thereon, it is closely knit that whole carrier is stacked, reduce the space and move radially, finish the welding of ring washer 9;
Finish the welding of the expanding duct 7 of giving vent to anger, steam outlet pipe 8, suction tude 1, air inlet expanding duct 2, adpting flange 3 and pressure transducer 10 more in order.
Embodiment 5:
As shown in Figure 3, described carrier is made up of two kinds of matrix foam metal cakes-A type carrier 4 and wire gaze cake-Type B carrier 5, the export and import place is provided with the buffer gap respectively, arranges and is installed in the carrier housing 6 by foam metal cake-A type carrier 4, wire gaze cake-Type B carrier 5, foam metal cake-A type carrier 4, buffer gap, foam metal cake-A type carrier 4, wire gaze cake-Type B carrier 5, foam metal cake-A type carrier 4, buffer gap, foam metal cake-A type carrier 4, wire gaze cake-Type B carrier 5, foam metal cake-A type carrier 4 orders; The import of metallic carrier and outlet and buffer gap end face are foam metal cake-A type carrier 4; Coating oxidation catalyst coating on the carrier; Foam metal cakes import and outlet and the both sides, buffer gap-A type carrier 4 usefulness metal collar 9 are fixing with 6 welding of carrier housing.
Chosen material is a SUS44 corrosion resistant plate material, and plate thickness is 1.5mm, and the welding internal diameter is 302mm, and length is 480mm garden tubbiness carrier housing 6; Finish ring washer 9 welding of immobilization carrier cake at the outlet end of garden tubbiness carrier housing 6;
Above the ring washer in bucket, put into one deck foam metal cake-A type carrier 4 cakes, layer of metal silk screen cake-Type B carrier 5 and one deck foam metal cake-A type carrier 4 earlier, finish the welding of ring washer 9; Second ring washer 9 welded at the 6mm place above this foam metal cake-A type carrier 4 then, the ring washer top, put into one deck foam metal cake-A type carrier 4 cakes, layer of metal silk screen cake-Type B carrier 5 and one deck foam metal cake-A type carrier 4, finish the welding of ring washer 9; The 3rd ring washer 9 welded at the 6mm place above this foam metal cake-A type carrier 4 then, the ring washer top, put into one deck foam metal cake-A type carrier 4 cakes, layer of metal silk screen cake-Type B carrier 5 and one deck foam metal cake-A type carrier 4, finish the welding of ring washer 9; Before ring washer 9 welding of each entrance point, this carrier is vertically put, on A type carrier 4 surfaces topmost, place the plane steel plate of a diameter less than this carrier diameter 10～20mm, place 10 kilograms metal counterweight then thereon, it is closely knit that whole carrier is stacked, reduce the space and move radially, finish the welding of ring washer 9;
Finish the welding of the expanding duct 7 of giving vent to anger, steam outlet pipe 8, suction tude 1, air inlet expanding duct 2, adpting flange 3 and pressure transducer 10 more in order.
Claims (6)
1, the POC metallic carrier preprocessor of two buffer gaps is made up of and pressure transducer (10) the ring washer (9) of the suction tude (1) of engine exhaust, air inlet expanding duct (2), adpting flange (3), carrier, carrier housing (6), the expanding duct of giving vent to anger (7), steam outlet pipe (8), immobilization carrier cake; It is characterized in that: carrier is stacked alternately in carrier housing (6) by one or both matrixes, and is provided with two buffer gaps in carrier housing (6), and the import of metallic carrier and outlet and buffer gap end face are foam metal cake-A type carrier (4); Coating oxidation catalyst coating on the carrier; Foam metal cakes import and outlet and the both sides, buffer gap-A type carrier (4) is fixing with carrier housing (6) welding with metal collar (9).
2, the POC metallic carrier preprocessor of two buffer gaps according to claim 1, it is characterized in that the described carrier of being made up of a kind of matrix is foam metal cake-A type carrier (4), import and outlet are provided with the buffer gap, arrange and are installed in the carrier housing (6) by foam metal cake-A type carrier (4), buffer gap and foam metal cake-A type carrier (4), buffer gap and foam metal cake-A type carrier (4) order.
3, the POC metallic carrier preprocessor of two buffer gaps according to claim 1, it is characterized in that described carrier is by two kinds of matrix foam metal cakes-A type carrier (4), wire gaze cake-Type B carrier (5) is formed, and foam metal cake-A type carrier (4) is pressed in two buffer gaps, the buffer gap, foam metal cake-A type carrier (4), wire gaze cake-Type B carrier (5), foam metal cake-A type carrier (4), wire gaze cake-Type B carrier (5), foam metal cake-A type carrier (4), the buffer gap, foam metal cake-A type carrier (4) order is arranged and is installed in the carrier housing (6).
4, the POC metallic carrier preprocessor of two buffer gaps according to claim 1, it is characterized in that described carrier is by two kinds of matrix foam metal cakes-A type carrier (4), wire gaze cake-Type B carrier (5) is formed, the export and import place is provided with the buffer gap respectively, presses foam metal cake-A type carrier (4), wire gaze cake-Type B carrier (5), foam metal cake-A type carrier (4), the buffer gap, foam metal cake-A type carrier (4), wire gaze cake-Type B carrier (5), foam metal cake-A type carrier (4), the buffer gap, foam metal cake-A type carrier (4), wire gaze cake-Type B carrier (5), foam metal cake-A type carrier (4) order is arranged and is installed in the carrier housing (6).
5, the POC metallic carrier preprocessor of two buffer gaps according to claim 1 is characterized in that the preparation process of described POC metallic carrier preprocessor is as follows:
1. body material is prepared: at first select the ventilative hole count 35ppi of per inch, the density in hole is greater than 90% foam sheet, and the diameter of cake is 300mm, and the thickness of cake is 2.5mm～150mm; Selecting the silk footpath is the siderochrome aluminium gas-liquid filter net of 0.4mm, and cutting into diameter is 300mm, and thickness is the silk sheet of 15mm, stacks edge sealing;
2. chemical treatment: to above-mentioned body material, through the oil removing degreasing process of alkaline medium; Under 650～750 ℃ condition, be incubated 2 hours then; Immigration contains 0.5%HCl and 0.2%Cr (NO
3)
2Treatment fluid in handled 4 hours; Earlier, use distilled water flushing again 2 times, 110 ℃ of dryings 2 hours with tap water flushing 2 times; Apply the catalyst coat of following material and ratio successively, ratio is 1 part Al
2O
3, 0.2 part TiO
2, 0.04 part La
2O
3, 0.1 part CeO
2, 0.06 part Cr
2O
3Carry out sintering after coating is finished, the sintering temperature of its coating is 250～550 ℃, and the time is 2～3 hours; Process the body material that has catalyzer;
3. the combination of body material and assembling: chosen material is a SUS44 corrosion resistant plate material, and plate thickness is 1.5mm, and the welding internal diameter is 302mm, and length is 480mm garden tubbiness carrier housing (6); Finish ring washer (9) welding of immobilization carrier cake at the outlet end of garden tubbiness carrier housing (6); Promptly above the ring washer of elder generation in bucket, put into one deck foam metal cake-A type carrier (4) cake, finish the welding of ring washer (9); At the 6mm place, top of this foam metal cake-A type carrier (4) welding second ring washer (9), above the ring washer, put into foam metal cake-A type carrier (4) cake of the regulation number of plies then, finish the welding of ring washer (9); At the 6mm place, top of this foam metal cake-A type carrier (4) welding the 3rd ring washer (9), above the ring washer, put into foam metal cake-A type carrier (4) cake of one deck then, finish the welding of ring washer (9); Before the ring washer of each entrance point (9) welding, this carrier is vertically put, on A type carrier (4) surface topmost, place the plane steel plate of a diameter less than this carrier diameter 10～20mm, place 10 kilograms metal counterweight then thereon, it is closely knit that whole carrier is stacked, reduce the space and move radially, finish the welding of ring washer (9);
4. finish the welding of the expanding duct of giving vent to anger (7), steam outlet pipe (8), suction tude (1), air inlet expanding duct (2), adpting flange (3) and pressure transducer (10) more in order.
6, the POC metallic carrier preprocessor of two buffer gaps according to claim 7 is characterized in that described foam metal cake-A type carrier (4) is foamed nickel, foam nickel chromium triangle, foam nickel chromium triangle aluminium, bubble iron chromium, bubble iron chromium aluminum, bubble iron chromium material.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102380377A (en) * | 2011-09-07 | 2012-03-21 | 中国第一汽车股份有限公司 | Metal-foam structure unit for POC (particle oxidation catalyst) postprocessor |
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| CN102658211A (en) * | 2011-12-15 | 2012-09-12 | 无锡威孚环保催化剂有限公司 | Metallic honeycomb catalyst for motorcycle exhaust gas purification and preparation method thereof |
| CN104594995A (en) * | 2014-11-26 | 2015-05-06 | 上海交通大学 | Car tail gas purifier based on metal foam |
| CN104594995B (en) * | 2014-11-26 | 2017-02-22 | 上海交通大学 | Car tail gas purifier based on metal foam |
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