CN1902384B - Particulate matter-containing exhaust emission controlling filter, exhaust emission controlling method and device - Google Patents
Particulate matter-containing exhaust emission controlling filter, exhaust emission controlling method and device Download PDFInfo
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- CN1902384B CN1902384B CN2004800393306A CN200480039330A CN1902384B CN 1902384 B CN1902384 B CN 1902384B CN 2004800393306 A CN2004800393306 A CN 2004800393306A CN 200480039330 A CN200480039330 A CN 200480039330A CN 1902384 B CN1902384 B CN 1902384B
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Abstract
A particulate matter-removing filter being resistant to clogging and ash blocking, requiring no special means such as back-washing and heating combustion, and being formed of inexpensive materials; and exhaust emission controlling method and device using this. (1) A particulate-matter-containing exhaust emission controlling filter which uses as a basic unit a pair of porous corrugated sheet and a porous flat sheet that support an exhaust emission controlling catalyst, has a molding formed by laminating the porous corrugated sheets so that their ridge lines alternately cross perpendicularly, has one of side surfaces, perpendicularly crossing the corrugated sheet ridge lines, of the molding or mutually-adjoining two surfaces that are the perpendicularly-crossing side surfaces sealed, and has exhaust gas in-flow passage and out-flow passage respectively formed between porous corrugated sheets via a porous flat sheet. (2) A filter having the exhaust emission controlling catalyst that is an oxidizing catalyst for oxidizing nitrogen monoxide in an exhaust gas.
Description
Technical field
The present invention relates to a kind of toxic emission controlled filter device that contains particulate matter; It can be with a kind of mode efficiently; Remove particularly particulate matter (PM) contained from the waste gas of diesel emission; And have low ventilation loss, and when ashes and cigarette ash gather, can remove sediments and need not to adopt large-sized equipment; The device that the invention still further relates to the exhaust gas purifying method of a kind of PM of containing and use above-mentioned filter.
Background technique
Diesel engine (DE) is one of internal-combustion engine the most effectively, because the carbon dioxide (CO of its each quantitative output power
2) discharge amount reduced and very economical, thereby can use low-quality fuel, such as heavy oil.There is a kind of trend, promptly uses diesel engine continually to prevent global warming.This is because people rethink that automobile has high energy efficient and carbon dioxide (CO with the stationary power generation facility that use diesel engine
2) discharge amount little.
Yet, from these use heavy oil or the diesel engine of light gas oil, giving off a large amount of particulate matter (PM) as its fuel, unburned hydrocarbon mixes with cigarette ash in the particulate matter, and this has become the principal element and the social concern of pollution.Various industries are studied and are developed aspect the PM removing such as diesel engine manufacturer and auto-maker; And make research and invention aspect the filter of PM ability having fabulous removing; Thereby design prefilter oxidation catalyst and DP (diesel particulate) filter (DPF), its middle filtrator is manufactured into and is supported with a kind of oxidation catalyst so that the nitrous oxide in the waste gas (NO) is oxidized to nitrogen dioxide (NO
2) and burning cigarette ash, thereby prevent or delay to be stopped up for a long time (for example, non-patent literature 1) by cigarette ash.
In these technology, many technology are wanted the filtering exhaust through making thin-walled that waste gas processes through the porous ceramics of a few μ m size.Through plate shape or cylindrical filter, the filter (its mesh is alternately silted up) of employing ceramic honeycomb porous molding and the filter that adopts the fine metal wire fabric to process that calcining metal or pottery are obtained, all be known.And, through these filters are had NO is oxidized to NO
2With oxidation with the burning cigarette ash the filter that ability was obtained, its objective is can prevent or limit these filters blocked (for example, patent documentation 1 and 2 and non-patent literature 2).
Non-patent literature 1: Japanese industry Environmental Management Association (Japan EnvironmentalManagement Association for Industry), environmental management (EnvironmentalManagement), the 37th volume, P441-449
Patent documentation 1: japanese unexamined patent application communique No.1-318715
Patent documentation 2: japanese unexamined patent application communique No.60-235620
Non-patent literature 2: the academic report collected works of Japanese car IEEE (Society ofAutomotive Engineers of Japan Academic Lecture Publisher) No.22-2
Above-mentioned conventional art has high DP calcination efficiency and premium properties.Yet; These technology waste gas use under the situation that light oil or heavy oil acts as a fuel and with these technical application under the situation of the stationary power generation machine that uses DE; Have following problems: (i) these filters are based on through utilizing pore to remove by filter the basic principle of PM; Thereby ventilation loss is big, and weakens the performance of high efficiency DE through regular meeting.(ii) producing because of inappropriate running under the situation of a large amount of cigarette ashes, many tendencies that obstruction is all arranged of these filters, and finally need take some countermeasures and eliminate to stop up such as, back scrubbing filter, or heating and burning cigarette ash, are stopped up preventing.(iii) the ashes in the fuel are accumulated in the pore of filter and cause stopping up, and this has shortened the working life of filter.The NO that is not consumed by burning cigarette ash (iv) is not set under the situation of denitrification apparatus in the downstream of waste gas
2Be discharged, cause producing tobacco and secondary pollution problems.
Summary of the invention
An object of the present invention is to solve the problems referred to above of conventional art; And a kind of filter of removing particulate matter is provided; Its material by cheapness is processed, and can prevent to be stopped up or sealing and need not take special means by ashes, such as the heating and the burning of back scrubbing or cigarette ash.Also device that purpose provides a kind of exhaust gas purifying method and uses above-mentioned filter of the present invention.
To achieve these goals, the present patent application claimed invention is following.
(1) a kind of exhaust emission control filter that contains particulate matter; It adopts a pair of porous corrugated sheet that is supported with a kind of exhaust gas purifying catalyst and porous flat plate as an elementary cell; And have by the said moulded parts that stack forms to porous corrugated sheet and porous flat plate; So that alternately square crossing of the crestal line of porous corrugated sheet; And two sides that adjoin each other with the side square crossing of said corrugated sheet crestal line or square crossing side moulded parts are sealed, thereby between said porous corrugated sheet, are formed with waste gas flow channel and flow pass respectively via porous flat plate.
(2) according to above-mentioned (1) filter, wherein, said exhaust gas purifying catalyst is a kind of oxidation catalyst, its nitrous oxide in can oxidation gaseous effluent.
(3) according to above-mentioned (1) or the filter of (2), wherein, said oxidation catalyst comprises platinum.
(4) according to above-mentioned (1) to (3) each filter, wherein, said oxidation catalyst comprises titanium oxide.
(5) a kind of exhaust gas purifying method that contains particulate matter; It adopts according to each filter of above-mentioned (1) to (4); Comprise: the crestal line of waste gas from passage along corrugated sheet introduced said filter; This passage is formed between the porous corrugated sheet and porous flat plate of molding; Allow that cleaned gas flows through porous flat plate and porous corrugated sheet in the passage, then along the crestal line of adjacent corrugated sheet from adjacent passage exhausting air, adjacency channel is formed between porous flat plate and the porous corrugated sheet and with the said channel vertical along this corrugated sheet crestal line and intersects.
(6) a kind of waste gas cleaning plant that contains particulate matter; Comprise above-mentioned (1) desired filter; A device and a device that is used for the carrier frequency channel break of the gas that discharges from said flow pass that is used for waste gas is introduced the said waste gas flow channel of filter.
(7) according to above-mentioned (6) waste gas cleaning plant, wherein, the said device that is used for the block gas passage has a kind of structure, this structure have permit gas through or the conversion function passed through of block gas.
(8) a kind of exhaust emission control filter that contains particulate matter; It has a molding; This molding is provided with a pair of porous corrugated sheet and the porous flat plate as elementary cell; Molding is through forming the elementary cell mutual superposition, so that the alternately square crossing of the crestal line of porous corrugated sheet, wherein; Molding sealed with one of surface square crossing of said corrugated sheet crestal line or with the side of said corrugated sheet crestal line square crossing and two surfaces that adjoin each other; Between these porous corrugated sheets, forming waste gas flow channel and waste gas flow pass through said porous flat plate, and, on two surfaces of porous corrugated sheet and a surperficial upper support that contacts with this porous corrugated sheet of porous flat plate have can oxidization of nitric oxide oxidation catalyst; Form the waste gas flow channel; And said oxidation catalyst neither is supported on of also not being supported in porous flat plate on two surfaces of porous corrugated sheet and the surface that this porous corrugated sheet contacts, and forms the waste gas flow pass.
(9) according to above-mentioned (8) filter, wherein, said oxidation catalyst comprises platinum.
(10) according to above-mentioned (8) or the filter of (9), wherein, said oxidation catalyst comprises titanium oxide.
(11) a kind of exhaust gas purifying method that contains particulate matter; It adopts according to each filter of above-mentioned (8) to (10); Comprise: the crestal line of waste gas from passage along corrugated sheet introduced said filter; This passage is formed between porous corrugated sheet and the porous flat plate and at the molding internal support has said oxidation catalyst; Crestal line along an adjacent corrugated plate discharges from passage with the gas that is cleaned in the molding, and this passage is formed between the porous flat plate and porous corrugated sheet that does not have catalyzer, and intersects with the channel vertical of this corrugated sheet crestal line.
(12) a kind of waste gas cleaning plant that contains particulate matter; It comprises above-mentioned (8) filter that requires; A device and a device that is used for the carrier frequency channel break of the gas that discharges from said flow pass that is used for waste gas is introduced the said waste gas flow channel of filter.
(13) according to above-mentioned (12) waste gas cleaning plant, wherein, the said device that is used for the block gas passage has a kind of structure, this structure have permit gas through or the conversion function passed through of block gas.
According to exhaust emission control filter and the exhaust gas purifying method that contains PM of the present invention, can realize having the DPF of catalyzer, it has high-performance and has reduced pressure and falls, and does not have to use the ceramic post sintering filter of the costliness that is used at present.And, because PM can and be removed by burning effectively, even when the amount of oxidation catalyst such as the platinum of costliness is greatly reduced, so cost is considerably reduced.In addition, in the present invention, direction and the sealing configuration thereof of waste gas being introduced exhaust emission control filter are prevented that with activation filter from being stopped up by things such as dusts by design like this effectively.
And; Among the exhaust steam passage that will alternately be formed in the molding, the passage that only is introduced on the direction along waste gas is designed to be supported with oxidation catalyst, after PM is removed; NO in the passage in the waste gas is almost not oxidized, thereby makes it possible to prevent NO
2From this device, emit.
Description of drawings
Fig. 1 is a kind of explanatory of exhaust emission control filter, and an instance of the present invention is shown;
Fig. 2 is the explanatory of an elementary cell, and it is made up of a porous corrugated sheet and a porous flat plate;
Fig. 3 is the explanatory of the used DPF piece of the present invention;
Fig. 4 is waste gas flow channel and the explanatory of flow pass among the present invention;
Fig. 5 is used for explaining the view that gathers at DPF particulate matter of the present invention;
Fig. 6 is used for explaining the view that gathers at traditional DPF particulate matter;
Fig. 7 is a kind of explanatory of exhaust emission control filter, and another instance of the present invention is shown;
Fig. 8 is the explanatory of a reactor, and DPF of the present invention is loaded into wherein;
Fig. 9 is the explanatory of a reactor, and DPF used in the instance is loaded into wherein.
Reference character:
1 porous corrugated sheet
2 porous flat plates
3 DPF pieces
4 sealing materials
5 particulate matters
The hole wall of 6 ceramic DPF (cell wall)
7 reactors
8 flanges
9 DPF support accessory
10 valves
Embodiment
According to a kind of exhaust emission control filter that contains particulate matter of the present invention; Has a kind of molding; This molding is provided with a pair of porous corrugated sheet and the porous flat plate as an elementary cell; Said plate is supported with a kind of exhaust gas purifying catalyst, and such as a kind of oxidation catalyst, this catalyzer can be oxidized to NO with the NO in the waste gas
2And molding is through forming the setting so that the crestal line of porous corrugated sheet alternately meets at right angles with said elementary cell stack; Wherein, sealed with side of the corrugated sheet crestal line square crossing of molding or two sides that adjoin each other of square crossing side.
Fig. 1 is an explanatory of the filter (DPF) of removing particulate matter, and one embodiment of the present of invention are shown.Fig. 2 is the explanatory of an elementary cell among the present invention, and it is made up of a porous corrugated sheet and a porous flat plate.Fig. 3 is the explanatory of molding, and wherein elementary cell is applied.
In Fig. 1, DPF is provided with the molding (being known as the DPF piece here) 3 and a kind of sealing material 4 of a bulk.This DPF piece 3 is constructed like this, and a plurality of elementary cells of being made up of a pair of porous corrugated sheet 1 and porous flat plate 2 (as shown in Figure 2) are applied, and the setting so that the crestal line of porous corrugated sheet 1 alternately meets at right angles is as shown in Figure 3.On one of them side of piece 3, be provided with sealing material 4, the crestal line square crossing of the porous corrugated sheet 1 of said side and formation DPF piece 3.Like this, between sealing material 4 and porous corrugated sheet 1, form a waste gas flow channel a (pending gas) and a gas flow pass b (Purge gas) (see figure 4) through porous flat plate 2.
In the present invention, as the material of porous corrugated sheet 1 and porous flat plate 2, such as the nonwoven fabric or the woven fabric that can adopt the ceramic fiber that has used the silica aluminum type, steel fiber plate or pottery are such as the porous sintered body of steinheilite.See that from the viewpoint that obtains to have highly porous lightweight DPF in these materials, thickness is that 0.5 to 0.1mm ceramic nonwoven fabric (plate) is preferential especially the employing.Although the shape to the corrugated sheet of porous corrugated sheet 1 has no particular limits,, under the situation that adopts above-mentioned thickness of slab, the pitch of ripple and highly preferably being designed respectively in the scope of 2-10mm and 1-5mm.As for the shape of the elementary cell of being made up of porous corrugated sheet 1 and porous flat plate 2, two boards preferably bundles through inorganic binder each other, although they can be by stack simply.
As for sealing material, material is comprised its sealing configuration has no particular limits, as long as can stoping, it on the surperficial facing surfaces of the crestal line introducing of the corrugated sheet of porous corrugated sheet 1, is forming exhaust gas flow path with the waste gas quilt.Can adopt such means, such as, a kind of method; Wherein, The lip-deep flow channel that will be sealed is filled in a kind of inorganic solidified material, a kind of method, wherein flow channel a kind of inorfil pulvilliform sealing material of being applied ointment or plaster under pressure; Perhaps a kind of method, wherein flow channel is stopped up by sheet metal.And; Can adopt a kind of material to cover the periphery of DPF piece and form integral body with the supporting hole wall of DPF piece; This material is to prepare such as the ceramic binder with high viscosity through soak into a kind of high adhesive glue to inorganic fiber mat, thereby forms the high sealing material of a kind of soundness.
Porous corrugated sheet 1 is necessary to support a kind of exhaust gas purifying catalyst with porous flat plate 2, especially a kind of oxidation catalyst component, and it in waste gas is introduced the said exhaust steam passage of side, is oxidized to NO with NO contained in the waste gas at least
2As catalytic component; Can adopt a kind of known catalyzer; This catalyzer is to make through allowing a kind of common precious metal to be supported on the support with large surface area such as platinum (Pt), such as titanium oxide, aluminium oxide, zirconium oxide or silica.When after the high heavy oil of combustion of sulfur amount, handling waste gas, particularly preferably be and adopt titanium oxide with highly-acidproof ability.
For the DPF of the application of the invention comes purifying exhaust air, pending gas is supplied along the crestal line of corrugated sheet porous corrugated sheet 1 and the passage between the porous flat plate 2 through being formed at DPF piece 3.Particularly, as shown in Figure 4, on DPF, be formed with a passage a and a passage b along direction B along direction A, passage a is formed between porous corrugated sheet 1 and the porous flat plate 2, and wherein direction B is perpendicular to direction A.The pending gas of introducing from direction A can only be introduced into passage a (waste gas flow channel); Simultaneously; The gas that is introduced into passage a pass on the porous flat plate 2 the hole and along direction B flow channel b (waste gas flow pass); This passage b forms by porous flat plate 2, with these porous flat plate 2 adjacent another porous corrugated sheet 1 and another porous flat plates 2, because the exit portion of passage a is sealed by sealing material 4.When waste gas passed through porous flat plate 2, PM contained in the gas was removed and is accumulated on the surface of porous flat plate 2 through filtration.Fig. 5 shows the schematic representation of the state of the PM that is gathered.In Fig. 5, the PM (particulate matter) that symbol 5 expressions are gathered.
And when pending gas contacted with porous flat plate 2 with porous corrugated sheet 1, the catalyst oxidation with oxidability that the NO in the pending gas is supported on these plates became NO
2According to following formula (1), the PM that gathers (cigarette ash) passes through NO
2Reaction be oxidized to CO
2, be removed then.Thereby might prevent such trouble, promptly along with change of time, the pressure of porous corrugated sheet 1 and porous flat plate 2 falls the PM that increases or gathered and stops up.
2NO
2+ C (cigarette ash) → CO
2+ 2NO (1)
In DPF of the present invention, as shown in Figure 5, there is not PM to gather on the surface of the porous corrugated sheet 1 in passage a.Thereby the NO in the gas can effectively contact with the porous corrugated sheet 1 that is positioned at porous flat plate 2 upper reaches, and PM is accumulated on the porous flat plate 2, causes NO
2Effective generation.So accumulating in porous flat plate 2 lip-deep PM can be by NO
2Oxidation and removing with effective and efficient manner.Thereby; Even the amount at the precious metal of the amount of the catalyzer of porous corrugated sheet 1 and porous flat plate 2 upper supports and the costliness that will be used is reduced; Also can carry out the oxidation of PM effectively and always reduce the amount of the cigarette ash of deposition, make the low pressure drop running of DPF become possibility.Should be noted that cigarette ash can not effectively be burnt in formed traditional DPF through the passage that alternately stops up cellular molding, because NO is arranged in the generation of the bottom of accumulated soot
2, as shown in Figure 6.
Shift to passage b through filtering the gas of therefrom removing cigarette ash, this passage b is made up of with porous flat plate 2 the porous corrugated sheet 1 of supporting NO oxidation catalyst.NO gas among the passage b also is oxidized to NO
2Thereby, when being used to reduce urea or NH
3Middle NO
xDenitrating catalyst when being present in the downstream of passage b, preferentially carry out according to the denitration reaction of following formula (2) with very high speed, even under low temperature condition, the NO in the waste gas
xAlso removed very effectively, improved the denitration ability of system.
NO+NO
2+2NH
3→2N
2+3H
2O (2)
In the present invention, the NO in the waste gas is oxidized to NO
2Oxidation catalyst can be supported on all porous corrugated sheets 1 of constituting said and the porous flat plate 2.Yet catalyzer can only be supported among the passage a that constitutes the waste gas flow channel, particularly on two surfaces of the porous corrugated sheet 1 that constitutes the waste gas flow channel and on the surface that contacts with porous corrugated sheet 1 at porous flat plate 2.
Under preceding a kind of situation, oxidation catalyst is supported on all porous corrugated sheets 1 and the porous flat plate 2, and the NO in the waste gas that PM is therefrom removed is also by oxidation in passage b.Thereby, the NO of the high poison that is produced is not set under the situation of denitrification apparatus in the downstream of filter
2Be discharged in the air, cause producing secondary pollution thus, produce tobacco and similar problem.At this moment, preferably as latter event, only be that the passage a that constitutes the waste gas flow channel is made into to support oxidation catalyst, and the passage b of formation waste gas flow pass is made into not support oxidation catalyst.This structural limitations in passage b NO be oxidized to NO
2Thereby, prevented NO
2The discharge system.
When not supporting oxidation catalyst,, can use support as it is if porous corrugated sheet 1 has high rigidity with porous flat plate 2 in the inside of passage b.Yet; Improving under the situation of support intensity, the slurries of titanium oxide, aluminium oxide or zirconic nonactive oxide or colloidal sol can be used as strengthening agent and are supported on two surfaces of porous corrugated sheet 1 on each surface with the porous flat plate 2 that contacts with porous corrugated sheet 1.
The direction A of slurries from Fig. 4 through with catalytic component easily introduces and these slurries pulled out the other way around; Also through the direction B of strengthening agent slurries from Fig. 4 easily introduced and these slurries pulled out the other way around; The inner surface of passage a just can be made into the supporting catalyst component, and the inner surface of passage b can be made into to support above-mentioned strengthening agent.At this moment, the surface that preferably slurries is not introduced into passage is wherein protected, such as through to this surface coverage sealing material.And, can adopt a kind of method, wherein be manufactured into when as shown in Figure 2 when the elementary cell of support, said components is supported, and these components are comprised or are coated on the support, and the elementary cell that is generated then is applied.
Fig. 7 is the explanatory of a kind of DPF, and another instance of the present invention is shown.In Fig. 7, DPF and difference shown in Figure 1 are that sealing material 4 is to be set on two adjacent surfaces, and these two surfaces are perpendicular to the side of the corrugated sheet crestal line of DPF piece 3.This structure is guaranteed to be introduced into the pending gas of this DPF piece 3 and can be discharged in one direction, thereby is loaded into that dead-space volume is reduced in the reactor of DPF, thereby makes waste gas cleaning plant compacter.
Fig. 8 is an explanatory, and the various instances of DPF structure when DPF of the present invention is loaded in the reactor are shown.Fig. 8 (A) is an explanatory of this reactor; The DPF that on two surfaces of DPF piece 3, is provided with sealing material 4 packs into wherein; Fig. 8 (B) and 8 (C) are the explanatory of a reactor; This reactor is provided with a valve 10, and this valve will be blocked with the exhaust steam passage on the surperficial relative side of introducing waste gas.In Fig. 8 (B), two planes are sealed by the combination of sealing material 4 and valve 10, and in Fig. 8 (C), only a surface is by valve 10 sealings.When valve 10 is provided for sealing, through switch on or off valve 10 control waste gas can by through or be stopped.Thereby because misoperation or engine failure, when passage was surpassed the soot oxidation ability of DPF by cigarette ash (PM) obstruction, valve 10 was unlocked with exhausting air, thereby the cigarette ash that gathers can be discharged from promptly running is returned to its reset condition.
Instance
To explain in more detail the present invention through instance below, right rather than will use these instances restrictions the present invention.
A kind of stack piece that is made up of the thick porous corrugated sheet of 0.2mm and thick porous flat plate of 0.2mm has been soaked into a kind of 15% TiO
2Colloidal sol (making) by Ishihara Sangyo Co., Ltd; Said plate is processed by the nonwoven fabric of silica aluminum fiber that (the corrugated honeycomb of intersection is by the NICHIAS manufactured; Corrugated sheet pitch: 3.3mm; Gap between two flat boards: 1.9mm, boundary dimension: 300mm * 300mm * 300mm), stack piece are dried by ventilation and 150 ℃ of dryings.Then, the stack piece soaked into a kind of dinitro diamino platinum (dinitrodiammineplatinum) solution (Pt concentration: 1.33g/L), dry once more and 600 ℃ of calcinings so that for DPF makes a kind of base material, DPF supports a kind of oxidation catalyst that contains 0.2g/L Pt.
The base material that is used to make the DPF with oxidation catalyst is to adopt to make with instance 1 identical mode, and just the 1.33g/L of concentration from instance 1 of dinitro diamino platinum becomes 0.32g/L.
Through solution (Pt concentration: the TiO of suspension 300g 1.7g/L) at a kind of dinitro diamino platinum
2(trade (brand) name: G5 is made surface area: 320m to powder by Millennium Pharmaceuticals limited company
2/ g) prepared a kind of slurries are kept 2 hours so that the Pt component is absorbed into TiO down at 80 ℃
2The surface.(trade (brand) name: Silicasol-OS is made SiO to the silica gel of 1kg by Nissan Chemical Industries (chemical industry) Co., Ltd
2Concentration: 20%) be added in the resulting solution of 1kg, the pH value of solution is regulated by a kind of salpeter solution, to obtain a kind of catalyst slurry that will be supported in the passage a.
Prepare the thick corrugated-crossed shape honeycomb of a kind of 0.2mm, its nonwoven fabric by the silica aluminum fiber process (by the NICHIAS manufactured, corrugated sheet pitch: 3.3mm, the gap between two flat boards: 1.9mm, boundary dimension: 300mm * 300mm * 300mm).Adopt a kind of method; Wherein, slurries are introduced a surface by the direction A from Fig. 4, discharge from facing surfaces then; Catalytic component only is supported in the internal surface of passage a; Ventilated and dry, calcine so that for DPF makes a kind of base material 150 ℃ of dryings and at 600 ℃, DPF supports a kind of oxidation catalyst that contains 0.1g/L Pt.
Through solution (Pt concentration: the TiO of suspension 300g 1.7g/L) at a kind of dinitro diamino platinum
2(trade (brand) name: G5 is made surface area: 320m to powder by Millennium Pharmaceuticals limited company
2/ g) prepared a kind of slurries are kept 2 hours so that the Pt component is absorbed into TiO down at 80 ℃
2The surface.(the trade (brand) name: Silicasol-OS of the silica gel of 1kg; Make by Nissan Chemical Industries (chemical industry) Co., Ltd) be added in the resulting solution of 1kg; The pH value of this solution is regulated by a kind of salpeter solution, to obtain a kind of catalyst slurry that will be supported in the passage a.
In addition, and the silica gel of 1kg (trade (brand) name: Silica sol-OS, made SiO by Nissan ChemicalIndustries (chemical industry) Co., Ltd
2Concentration: 20%) be added into a kind of of 1kg through suspension 300g TiO
2(trade (brand) name: CR50 is made surface area: 3m to powder by Ishihara Sangyo Co., Ltd
2/ g) in the prepared slurries, the pH value of this solution is regulated by a kind of salpeter solution, to obtain a kind of nonactive inorganic oxide slurries that will be supported in the passage b.
Prepare the thick corrugated-crossed shape honeycomb of a kind of 0.2mm, its nonwoven fabric by the silica aluminum fiber process (by the NICHIAS manufactured, corrugated sheet pitch: 3.3mm, the gap between two flat boards: 1.9mm, boundary dimension: 300mm * 300mm * 300mm).Adopt a kind of method, wherein, the above-mentioned slurries that are used for passage a are introduced a surface by the direction A from Fig. 4, and discharge from facing surfaces, and catalytic component only is supported in the internal surface of passage a, is ventilated and dries, 150 ℃ of dryings.Then, adopt a kind of method, wherein; The above-mentioned slurries that are used for passage b are introduced a surface by the direction B from Fig. 4; And from the facing surfaces discharge, said nonactive oxide is supported in the internal surface of passage b, is ventilated and dries; 150 ℃ of dryings, and make a kind of base material 600 ℃ of calcinings so that for the DPF with oxidation catalyst.
The base material that is used to make the DPF with oxidation catalyst is to adopt to make with instance 4 identical modes; The catalyst slurry flow channel b that just is used for passage a; Rather than inactive ingredients slurries flow channel b is with supporting catalyst, thereby makes passage a and b be supported with a kind of NO-oxidation component.
Comparative example 1
(made by Hitachi Metals (Hitachi Metals) Co., Ltd, honeycomb is counted 100cpsi to a kind of commercial obtainable DPF, 5.66 inches
Inch is long) to process by cordierite ceramic, it is made through alternately the opening portion of the passage of honeycomb molding being stopped up, and this DPF is soaked into a kind of TiO 2 sol and (is made TiO by Ishihara Sangyo Co., Ltd
2Content: 30%), then dry TiO with supporting 60g/L with centrifuge
2The DPF that is soaked into TiO 2 sol is after 150 ℃ of dryings; Further by a kind of dinitro diamino platinic acid solution impregnation; Thereby based on PDF the Pt that is supported amount is 1.6g/L, drying is then 600 ℃ of temperature lower calcinations 2 hours, to make a kind of DPF with catalyzer.
Comparative example 2
The base material that is used to make the DPF with catalyzer is to adopt to make with comparative example 1 identical mode, is that the concentration of dinitro diamino platinum is diluted to 1/8 and reduces to 0.2g/L with the amount with the platinum that is supported.
Test Example
Each base material that will be used for being manufactured on the DPF with oxidation catalyst that instance 1-5 obtains is cut into the cuboid that 150mm is long, 150mm is high and 117mm is wide, and a kind of sealing material is used on its one of them surface.This base material (DPF piece) is filled in the reactor as shown in Figure 9, thereby one of surface that all the other are not sealed is (gas supply side) up.In other words, this DPF piece 3 is fixed on the DPF supporting accessory 9 that is arranged in the reactor 7, thereby this surface that is not sealed up.And each the DPF piece with catalyzer that in comparative example 1 and 2, is obtained is filled in the columniform reactor, and has sealed the periphery of DPF piece and this reactor.
Each of these reactors is set at the floss hole place of the diesel engine that acts as a fuel with heavy oil, and exhaust gas discharged is allowed to 100m from diesel engine
3The speed of/h is discharged, to detect following project.Its result is shown in Table 1.
(1) existence of cigarette ash during engine start.
(2) situation (dpf temperature: about 300 ℃) of rising falls in pressure when low load operation.
(3) the rising situation (dpf temperature: about 400 ℃) of falling with pressure falls in pressure when 100% specified running.
(4) when 100% specified running in the concentration of the entrance and exit place of DPF particulate matter.
(5) under 100% specified running situation in the outlet port of DPF NO
2Concentration.
Table 1
The result who is obtained has been shown in the table 1, from table, can have found, the DPF with oxidation catalyst according to the present invention can make cigarette ash by burning effectively, can its pressure be fallen even the amount of catalyst Pt is very little be suppressed to one low-level.
From table 1, can find; Compare with the DPF that in comparative example, is obtained; The DPF that in instance 1-5 of the present invention, obtains with oxidation catalyst can make cigarette ash by more effectively the burning, even the amount of catalyst Pt is very little, but also can its pressure be fallen be suppressed to one low-level.And can know, because this oxidation catalyst is not supported among the passage b (waste gas flow pass) NO in the DPF outlet port in instance 3 and 4
2Concentration be limited to one low-level, demonstrating these DPF of the present invention is good on environment.In turn, has under the situation of oxidation catalyst of instance 5 NO at DPF in the DPF outlet port
2Concentration be raised because oxidation catalyst is supported in the whole exhaust steam passage.Yet, under this situation, a denitrating catalyst device is set through downstream at DPF, just can prevent that NO2 from discharging system.
On the contrary, increase falls in traditional its pressure of ceramic DPF that in comparative example 1 and 2, is obtained, and in the outlet port of each DPF NO
2Concentration also increase.
Industrial applicibility
According to the present invention; Particularly from diesel engine in the exhaust gas discharged contained particulate matter mass-energy be removed; And have low ventilation loss and high efficient, and when ash content and cigarette ash gathered, they can also be removed and but need not to adopt large-sized equipment; This can guarantee to provide a kind of DPF that helps preventing the cheapness of environmental air pollution, thereby DPF of the present invention will produce very big society and economic benefit.
Claims (6)
1. exhaust emission control filter that contains particulate matter; It has a molding; This molding is provided with a pair of porous corrugated sheet and the porous flat plate as elementary cell; This molding through with said elementary cell mutual superposition so that the crestal line of porous corrugated sheet alternately square crossing form; Wherein, Molding sealed,, it is characterized in that between these porous corrugated sheets, to form waste gas flow channel and waste gas flow pass through said porous flat plate with surface square crossing of said corrugated sheet crestal line or with the side of said corrugated sheet crestal line square crossing and two surfaces that adjoin each other; The oxidation catalyst that the ability oxidization of nitric oxide is arranged on two surfaces of porous corrugated sheet and at a surperficial upper support that contacts with this porous corrugated sheet of porous flat plate; Form the waste gas flow channel, said oxidation catalyst neither is supported in and also is not supported on porous flat plate and the surface that this porous corrugated sheet contact formation waste gas flow pass on two surfaces of porous corrugated sheet.
2. according to the described filter of claim 1, it is characterized in that said oxidation catalyst comprises platinum.
3. according to claim 1 or 2 described filters, it is characterized in that said oxidation catalyst comprises titanium oxide.
4. exhaust gas purifying method that contains particulate matter; It adopts according to any described filter among the claim 1-3; Comprise the crestal line of waste gas from passage along corrugated sheet introduced the said filter; This passage is formed in molding between the porous corrugated sheet and porous flat plate of the said oxidation catalyst of supporting; Will be in molding the crestal line discharging of cleaned gas from passage along adjacent corrugated plate, this passage is formed between the porous flat plate that do not have supporting catalyst and the porous corrugated sheet and with the channel vertical of this corrugated sheet crestal line and intersects.
5. waste gas cleaning plant that contains particulate matter; Comprise filter as claimed in claim 1, and be provided for waste gas introduce filter said waste gas flow channel device and be used for device from the carrier frequency channel break of the gas of said flow channel discharging.
6. according to the described waste gas cleaning plant of claim 5, it is characterized in that the said device that is used for the block gas passage has a structure, this structure have permit gas through or the conversion function passed through of block gas.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003393879 | 2003-11-25 | ||
| JP393879/2003 | 2003-11-25 | ||
| JP099149/2004 | 2004-03-30 | ||
| JP2004099149A JP4758071B2 (en) | 2003-11-25 | 2004-03-30 | PM-containing exhaust gas purification filter, exhaust gas purification method, and purification apparatus |
| PCT/JP2004/017395 WO2005052327A1 (en) | 2003-11-25 | 2004-11-24 | Particulate matter-containing exhaust emission controlling filter, exhaust emission controlling method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1902384A CN1902384A (en) | 2007-01-24 |
| CN1902384B true CN1902384B (en) | 2012-09-05 |
Family
ID=37657562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2004800393306A Expired - Fee Related CN1902384B (en) | 2003-11-25 | 2004-11-24 | Particulate matter-containing exhaust emission controlling filter, exhaust emission controlling method and device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2008309160A (en) |
| CN (1) | CN1902384B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9084957B2 (en) | 2008-07-25 | 2015-07-21 | Donaldson Company, Inc. | Pleated filtration media, media packs, filter elements, and methods for filtering fluids |
| US9433884B2 (en) | 2007-06-26 | 2016-09-06 | Donaldson Company, Inc. | Filtration media pack, filter element, and methods |
| US9517430B2 (en) | 2007-02-02 | 2016-12-13 | Donaldson Company, Inc. | Air filtration media pack, filter element, air filtration media, and methods |
| CN111432909A (en) * | 2017-08-10 | 2020-07-17 | 唐纳森公司 | Fluid filtration apparatus, systems and methods |
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| CN105148614B (en) | 2008-02-04 | 2020-01-17 | 唐纳森公司 | Method and apparatus for forming fluted filtration media |
| EP2334423B1 (en) * | 2008-08-30 | 2017-03-01 | Corning Incorporated | Methods and devices for fluid handling |
| JP2010132591A (en) * | 2008-12-03 | 2010-06-17 | Kao Corp | Solid powdery cosmetic |
| JP5711230B2 (en) | 2009-08-03 | 2015-04-30 | ドナルドソン カンパニー，インコーポレイティド | Method and apparatus for forming fluted filtration media having tapered flutes |
| EP2528675B2 (en) | 2010-01-25 | 2021-12-22 | Donaldson Company, Inc. | Pleated filtration media having tapered flutes |
| DE102011003019A1 (en) * | 2011-01-24 | 2012-07-26 | Ford Global Technologies, Llc | Particulate filter and method for purifying an exhaust gas stream |
| JP5649503B2 (en) | 2011-04-08 | 2015-01-07 | 株式会社豊田中央研究所 | Exhaust gas purification apparatus and exhaust gas purification method using the same |
| CN105201595A (en) * | 2015-10-10 | 2015-12-30 | 特威泰克环保技术（山东）有限公司 | Diesel vehicle tail gas after-treatment device |
| CN110180387A (en) * | 2019-07-02 | 2019-08-30 | 苏州仕净环保科技股份有限公司 | A kind of efficient process system polluting gas source |
| CN111980786B (en) * | 2020-08-27 | 2022-06-03 | 哈尔滨艾瑞排放控制技术股份有限公司 | Split-flow type tail gas purification device for energy conservation and emission reduction of automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989003720A1 (en) * | 1987-10-23 | 1989-05-05 | Massachusetts Institute Of Technology | Methods and devices for gas cleaning |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4343631A (en) * | 1981-01-30 | 1982-08-10 | Westinghouse Electric Corp. | Hot gas particulate removal |
| JP2954609B2 (en) * | 1989-10-12 | 1999-09-27 | 旭硝子株式会社 | Exhaust black smoke removal device |
| JP3900421B2 (en) * | 2001-11-09 | 2007-04-04 | トヨタ自動車株式会社 | Wall flow type diesel exhaust gas purification filter type catalyst and diesel exhaust gas purification device |
-
2004
- 2004-11-24 CN CN2004800393306A patent/CN1902384B/en not_active Expired - Fee Related
-
2008
- 2008-07-08 JP JP2008177756A patent/JP2008309160A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989003720A1 (en) * | 1987-10-23 | 1989-05-05 | Massachusetts Institute Of Technology | Methods and devices for gas cleaning |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9517430B2 (en) | 2007-02-02 | 2016-12-13 | Donaldson Company, Inc. | Air filtration media pack, filter element, air filtration media, and methods |
| US9433884B2 (en) | 2007-06-26 | 2016-09-06 | Donaldson Company, Inc. | Filtration media pack, filter element, and methods |
| US9084957B2 (en) | 2008-07-25 | 2015-07-21 | Donaldson Company, Inc. | Pleated filtration media, media packs, filter elements, and methods for filtering fluids |
| CN111432909A (en) * | 2017-08-10 | 2020-07-17 | 唐纳森公司 | Fluid filtration apparatus, systems and methods |
| CN111432909B (en) * | 2017-08-10 | 2022-07-01 | 唐纳森公司 | Fluid filtration apparatus, systems and methods |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1902384A (en) | 2007-01-24 |
| JP2008309160A (en) | 2008-12-25 |
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Owner name: MITSUBISHI HITACHI POWER SYSTEM LTD. Free format text: FORMER OWNER: BABUCOCK-HITACHI KABUSHIKI KAISHA Effective date: 20150402 |
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Effective date of registration: 20150402 Address after: Kanagawa, Japan Patentee after: Mitsubishi Hitachi Power System Ltd. Address before: Tokyo, Japan Patentee before: Babucock-Hitachi Kabushiki Kaisha |
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