KR20100064876A - Exhaust gas filter system - Google Patents

Exhaust gas filter system Download PDF

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Publication number
KR20100064876A
KR20100064876A KR1020080123525A KR20080123525A KR20100064876A KR 20100064876 A KR20100064876 A KR 20100064876A KR 1020080123525 A KR1020080123525 A KR 1020080123525A KR 20080123525 A KR20080123525 A KR 20080123525A KR 20100064876 A KR20100064876 A KR 20100064876A
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KR
South Korea
Prior art keywords
coating layer
filter
formed
exhaust gas
washcoat
Prior art date
Application number
KR1020080123525A
Other languages
Korean (ko)
Inventor
권충일
서정민
Original Assignee
기아자동차주식회사
현대자동차주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 기아자동차주식회사, 현대자동차주식회사 filed Critical 기아자동차주식회사
Priority to KR1020080123525A priority Critical patent/KR20100064876A/en
Publication of KR20100064876A publication Critical patent/KR20100064876A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/02—Solids
    • B01J35/023—Catalysts characterised by dimensions, e.g. grain size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure, e.g. thickness, cell density
    • B01D46/247—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure, e.g. thickness, cell density of the cells, e.g. diamonds, hexagonal configuration, cell density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/0006—Catalysts containing parts with different compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/02—Solids
    • B01J35/04—Foraminous structures, sieves, grids, honeycombs
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0006—Honeycomb structures
    • C04B38/0009—Honeycomb structures characterised by features relating to the cell walls, e.g. wall thickness or distribution of pores in the walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure, e.g. thickness, cell density
    • B01D46/2466—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure, e.g. thickness, cell density of the adhesive layers, i.e. joints between segments, e.g. undulations, thickness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/60—Discontinuous, uneven properties of filter material, e.g. different material thickness along the longitudinal direction; Higher filter capacity upstream than downstream in same housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • F01N2510/0682—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa

Abstract

PURPOSE: An exhaust gas filter system is provided to improve regeneration efficiency while preventing increase of back pressure by reducing a thickness of a catalyst coating layer on a rear end part, and to improve fuel efficiency. CONSTITUTION: An exhaust gas filter system comprises an asymmetric diesel particulate filter in which a small channel(310) is formed. On the channel, a first coating layer(500) formed by coating an inner side of the front surface with first wash-coat, and a second coating layer(505) formed by coating the inner side of the rear surface with second wash-coat. A thickness of the second coating layer is thicker or the same with the thickness of the first coating layer.

Description

Exhaust Gas Filter System {EXHAUST GAS FILTER SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas filter system, and more particularly, to an exhaust gas filter system which reduces back pressure of exhaust gas and improves the removal efficiency of particulate matter.

In general, the exhaust system of the engine functions to discharge the exhaust gas to the rear of the vehicle and to reduce the exhaust sound.

In recent years, catalytic devices have been used to purify exhaust gases, which convert harmful emissions into harmless carbon dioxide and water.

In particular, the catalytic device reduces hydrocarbons, carbon monoxide and nitrogen oxides (NOx). The catalytic device also collects or burns particulate matter. In general, a catalytic device that physically collects and burns particulate matter discharged from diesel is called a diesel particulate filter (DPF), and the diesel particulate filter has a plurality of channels formed in an exhaust gas flow direction. .

In addition, at least one of the channels has a structure in which the inlet is closed and the outlet is open, and at least one of the channels is the inlet is opened, the outlet is closed, and the closed part of the inlet or outlet is alternately arranged. .

On the other hand, diesel oxidation catalyst (DOC) and Catalyzed Particulate Filter (CPF) are applied among the catalyst devices, and they collect and remove particulate matter (PM).

On the other hand, an expensive SiC or AT filter is used for the filter, and an asymmetric filter is used to increase the effective volume of particulate matter trapping of the filter. However, there is a problem in that fuel efficiency is worsened by increasing the back pressure as the particulate matter is collected.

It is an object of the present invention to provide an exhaust gas filter system which prevents an increase in the exhaust gas back pressure in advance and improves the regeneration efficiency.

Exhaust gas filter system according to the present invention for achieving this object is asymmetric diesel filtration filter having a large diameter of the open inlet, a small diameter of the outlet portion of the closed rear end face, the inner surface of the front end of the channel A first coating layer formed by coating a first washer coat, and a second coating layer formed by coating a second washer coat on the inner side surface of the rear end of the channel, wherein the thickness of the second coating layer is that of the first coating layer. It is characterized by being formed equal to or smaller than the thickness.

The first coating layer is formed at the front end with respect to the longitudinal center of the filter, and the second coating layer is formed at the rear end with respect to the longitudinal center of the filter with respect to the center.

The amount of the first washcoat for the first coating layer is about twice the amount of the second washcoat for the second coating layer.

The total amount (g) of the noble metal contained in the first wash coat and the noble metal contained in the second wash coat is the same, and the concentration (g / L) of the noble metal is varied.

In the filter, a plurality of the channels are formed in the exhaust gas flow direction, at least one of the channels is closed at the inlet and the outlet is opened, at least one of the channels is at the inlet is opened, and the outlet is closed, The closed portions of the inlet or outlet are alternately arranged.

The front end of the filter is immersed in the first washcoat liquid, and the rear end is immersed in the second washcoat liquid to form the first coating layer and the second coating layer.

The thickness of the first coating layer and the thickness of the second coating layer is adjusted by adjusting the amount of the first wash coat.

As described above, according to the exhaust gas filter system according to the present invention, by reducing the thickness of the catalyst coating layer at the rear end, it is possible to prevent the back pressure from increasing and improve the regeneration efficiency.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of an exhaust gas filter system according to an exemplary embodiment of the present invention.

Referring to FIG. 1, 100 indicates a diesel engine, 110 indicates an exhaust pipe, and 120 indicates a diesel particulate filter (DPF).

The diesel filtration filter 120 mainly collects and removes particulate matter (PM) including soot contained in exhaust gas.

In the exemplary embodiment of the present invention, a catalyzed particulate filter (CPF) may be applied instead of the diesel filtration filter 120.

2 is a schematic side view of a filter provided in an exhaust gas filter system according to an exemplary embodiment of the present invention, FIG. 3 is a side view illustrating View A of FIG. 2, and FIG. 4 is a side view illustrating View B of FIG. 2. to be.

Referring to FIG. 2, a filter 200 for collecting particulate matter is disposed inside the diesel filtration filter 120, and the filter 200 has a front end 230 based on the central portion 250 in a longitudinal direction. And the rear end 240 is formed. In addition, a front end surface 210 is formed in front of the front end 230, and a rear end surface 220 is formed behind the rear end 240.

3 and 4, a plurality of channels 310 and 320 through which exhaust gas passes from the front end surface 210 of the filter 200 to the rear end surface 220 is formed.

The channels 310 and 320 formed on the front surface 210 are alternately closed by the first plug 300, and the channels 310 and 320 formed on the rear surface 220 are alternately second. The plug 400 is closed.

More specifically, the cross-sectional area of the first channel 310 in which the inlet of the front end surface 210 is opened and the outlet of the rear end surface 220 is closed by the second plug 400 is defined by the filter 200. It has a structure that gradually decreases in the longitudinal direction.

On the contrary, the cross-sectional area of the second channel 320 in which the inlet of the front end surface 210 is closed by the first plug 300 and the outlet of the rear end surface 220 is opened gradually increases in the longitudinal direction of the filter 200. It has an elongated structure.

As described above, the filter 200 has an asymmetric structure, which can effectively increase the accumulation amount of particulate matter and increase the effective volume by increasing the inlet of the filter, thereby simultaneously reducing the volume and production cost of the filter. Can be.

FIG. 5 is a detailed cross-sectional view of the filter taken along the VV and VI-VI lines of FIG. 2.

Referring to FIG. 5, a first coating layer 500 is formed on an inner surface of the first channel 310 formed in the front end 230 of the filter 200, and the rear end of the filter 200. A second coating layer 505 is formed on an inner side surface of the first channel 310 formed at 240.

The thickness d1 of the first coating layer 500 and the thickness d2 of the second coating layer 505 are the same, or the thickness of the first coating layer is larger than that of the second coating layer, so that the filter 200 The back pressure can be prevented from increasing backwards.

That is, by reducing the back pressure formed in the second coating layer and the ash and soot discharged from the engine are accumulated on the rear end surface, the back pressure of the entire exhaust system can be reduced.

6 is a table showing the features of the washcoat applied to the filter according to an embodiment of the present invention.

Referring to FIG. 6, a first wash coat is used to form the first coating layer 500 formed on the front end 230 of the filter 200, and the first formed on the rear end 240. A second washcoat is used to form the two coating layer 505.

In an embodiment of the invention, the volume of the first washcoat is greater than the volume of the second washcoat.

As described above, since the thickness d1 of the first coating layer 500 and the thickness d2 of the second coating layer 505 are the same, the first washer coat used in a portion having a large inner surface area of the channel. The amount is large. More specifically, the amount of the first washcoat is twice the amount of the second washcoat.

When the second coating layer 505 formed in the rear end 240 is thick because the particulate matter is collected and accumulated in the rear end 240 of the filter 200, the ash caused by the oil additive ( Ash and soot are accumulated on the front end or the inner wall of the filter to increase the back pressure or to reduce the removal efficiency of particulate matter.

However, in the exemplary embodiment of the present invention, the thickness of the second coating layer 505 is the same as that of the first coating layer 500 so that ash and soot are normally accumulated at the rear end of the filter, thereby reducing the back pressure and improving the regeneration efficiency. Can be improved.

The method of coating the inner surfaces of the channels 310 and 320 formed in the filter 200 may be performed by dipping the filter 200 in the washcoat liquid by dipping the front end 230 or the rear end 240. If the diameter of the channel (310, 320) is small, if the same amount of washcoat is coated, the washcoat is thicker than the case where the diameter of the front end portion is relatively large.

In this case, the thickness of the second coating layer 505 formed on the rear end 240 of the filter 200 may be thick, but in the embodiment of the present invention, the second coating layer 505 is used. The thickness of the second coating layer 505 may be adjusted to be thin by making the amount of the wash coat smaller than the amount of the first wash coat.

In addition, in the embodiment of the present invention, the temperature for forming the second washer coat used for the second coating layer 505 may be set higher than the temperature for forming the first washer coat so that the thickness may be adjusted to be thin.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and easily changed and equalized by those skilled in the art from the embodiments of the present invention. It includes all changes to the extent deemed acceptable.

1 is a schematic diagram of an exhaust gas filter system according to an exemplary embodiment of the present invention.

2 is a schematic side view of a filter provided in an exhaust gas filter system according to an exemplary embodiment of the present invention.

FIG. 3 is a side view illustrating View A of FIG. 2.

4 is a side view illustrating View B of FIG. 2.

FIG. 5 is a detailed cross-sectional view of the filter taken along the VV and VI-VI lines of FIG. 2.

6 is a table showing the features of the washcoat applied to the filter according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: engine

110: exhaust pipe

120: diesel filtration filter

200: filter

210: shear surface

220: back section

230: shear

240: rear end

310: first channel

320: second channel

300: first plug

400: second plug

500: first coating layer

505: second coating layer

Claims (7)

  1. In the asymmetric diesel filtration filter in which a large diameter of the open inlet and a small diameter of the outlet of the closed rear end face is formed,
    A first coating layer formed by coating a first washer coat on an inner surface of a front end portion of the channel; And
    And a second coating layer formed by coating a second washer coat on the inner side of the rear end of the channel.
    The thickness of the two coating layer is the exhaust gas filter system, characterized in that formed in the same or smaller than the thickness of the first coating layer.
  2. According to claim 1,
    The first coating layer is formed in the front end with respect to the longitudinal center of the filter, the second coating layer is formed in the rear end with respect to the longitudinal center of the filter with respect to the center.
  3. The method of claim 2,
    And the amount of the first washcoat for the first coating layer is about twice the amount of the second washcoat for the second coating layer.
  4. The method of claim 3,
    The total amount (g) of the noble metal contained in the first washcoat and the noble metal contained in the second washcoat is the same, and the concentration (g / L) of the noble metal is varied.
  5. According to claim 1,
    In the filter,
    A plurality of said channels are formed in the direction of the exhaust gas flow, at least one of the channels being closed at the inlet and the outlet being open, at least one of the channels having the inlet open and the outlet closed, Exhaust gas filter system in which closed sections are alternately arranged.
  6. According to claim 1,
    And dipping the front end portion of the filter into the first washcoat liquid and forming the first coating layer and the second coating layer by dipping the rear end portion into the second washcoat liquid.
  7. The method according to claim 6,
    And controlling the thickness of the first coating layer and the thickness of the second coating layer by adjusting the amount of the first washer coat.
KR1020080123525A 2008-12-05 2008-12-05 Exhaust gas filter system KR20100064876A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020080123525A KR20100064876A (en) 2008-12-05 2008-12-05 Exhaust gas filter system

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020080123525A KR20100064876A (en) 2008-12-05 2008-12-05 Exhaust gas filter system
US12/466,174 US20100139261A1 (en) 2008-12-05 2009-05-14 Exhaust Gas Filter System
DE200910022270 DE102009022270A1 (en) 2008-12-05 2009-05-22 Exhaust gas filtration system

Publications (1)

Publication Number Publication Date
KR20100064876A true KR20100064876A (en) 2010-06-15

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US (1) US20100139261A1 (en)
KR (1) KR20100064876A (en)
DE (1) DE102009022270A1 (en)

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Publication number Publication date
US20100139261A1 (en) 2010-06-10
DE102009022270A1 (en) 2010-06-10

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