US20070175204A1 - SCR muffler - Google Patents
SCR muffler Download PDFInfo
- Publication number
- US20070175204A1 US20070175204A1 US10/588,980 US58898005A US2007175204A1 US 20070175204 A1 US20070175204 A1 US 20070175204A1 US 58898005 A US58898005 A US 58898005A US 2007175204 A1 US2007175204 A1 US 2007175204A1
- Authority
- US
- United States
- Prior art keywords
- reducing agent
- exhaust gas
- scr
- pipe
- supplying nozzle
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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Classifications
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- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
- B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
- B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
- B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/435—Mixing tubes composed of concentric tubular members
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- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- 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
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/08—Exhaust treating devices having provisions not otherwise provided for for preventing heat loss or temperature drop, using other means than layers of heat-insulating material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to an SCR muffler with an SCR catalyst for selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas.
- NOx nitrogen oxide
- a reducing agent or a reducing agent precursor such as urea water is supplied by spraying to exhaust gas via a reducing agent, etc., supplying nozzle from upstream of an SCR muffler having a selective reduction SCR (Selective Catalytic Reduction) catalyst, thereby selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas by the SCR catalyst.
- SCR Selective Catalytic Reduction
- an object of the present invention is to provide an SCR muffler that can retain the heat of the reducing agent, etc., supplying nozzle and the exhaust pipe, thereby preventing the reduction of the efficiency of the SCR catalyst purging nitrogen oxide (NOx) even at low temperatures and improving the durability of the reducing agent, etc., supplying nozzle.
- NOx nitrogen oxide
- the present invention to solve the above problems is an SCR muffler which comprises an SCR catalyst for selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas; an exhaust pipe that allows the exhaust gas to flow into the SCR catalyst; and a reducing agent, etc., supplying nozzle that supplies a reducing agent or a reducing agent precursor to the exhaust gas.
- the SCR muffler is characterized in that the reducing agent, etc., supplying nozzle is of a double pipe structure.
- the SCR muffler of the invention may be characterized in that a heat retaining material is provided in between an inner pipe and an outer pipe that form the double pipe structure.
- the SCR muffler of the invention may be characterized in that there is a space defined between an inner pipe and an outer pipe that form the double pipe structure.
- an SCR muffler which comprises an SCR catalyst for selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas; an exhaust pipe that allows the exhaust gas to flow into the SCR catalyst; and a reducing agent, etc., supplying nozzle that supplies a reducing agent or a reducing agent precursor to the exhaust gas.
- the SCR muffler is characterized in that the exhaust pipe is of a double pipe structure.
- the SCR muffler of the invention may be characterized in that a heat retaining material is provided in between an inner pipe and an outer pipe that form the double pipe structure.
- the SCR muffler of the invention may be characterized in that there is a space defined between an inner pipe and an outer pipe that form the double pipe structure.
- FIG. 1 is a basic schematic view of an SCR muffler according to an embodiment of the present invention.
- FIG. 1 is a basic schematic view of an SCR muffler according to an embodiment of the present invention, which comprises an SCR catalyst 1 for selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas, an exhaust pipe 2 that allows exhaust gas to flow into the SCR catalyst 1 , and a reducing agent, etc., supplying nozzle 3 that supplies a reducing agent or a reducing agent precursor to exhaust gas, the reducing agent, etc., supplying nozzle 3 or the exhaust pipe 2 having a heat-retaining double pipe structure.
- NOx nitrogen oxide
- FIG. 1 ( a ) shows an SCR muffler with a reducing agent, etc., supplying nozzle 3 having a heat-retaining double pipe structure
- FIG. 1 ( b ) shows an SCR muffler with an exhaust pipe 2 having a heat-retaining double pipe structure.
- exhaust gas passes through the exhaust pipe 2 in a direction from upstream to downstream and flows into the SCR catalyst 1 .
- Exhaust gas is exhausted from an internal combustion engine such as a diesel-engine and contains as toxic substances unburned hydrocarbon (HC), carbon monoxide (CO), and nitrogen oxide (NOx) such as nitric monoxide (NO) and nitric dioxide (NO 2 ).
- HC unburned hydrocarbon
- CO carbon monoxide
- NOx nitrogen oxide
- NO nitric monoxide
- NO 2 nitric dioxide
- Such exhaust gas is supplied via the reducing agent, etc., supplying nozzle 3 with a reducing agent or a reducing agent precursor during the time before flowing into the SCR catalyst 1 .
- the reducing agent or reducing agent precursor includes a reducing agent precursor such as a substance that liberates a reducing agent, as well as a reducing agent itself, and may be any of hydrocarbon, cyanurate, ammonia, ammonium carbonate, ammonium carbamate, urea, and combinations of them.
- the reducing agent or reducing agent precursor may be in the form of any of solid, liquid, and gas.
- the reducing agent, etc., supplying nozzle 3 may supply ammonia itself as a reducing agent, but ammonia is strong in smell and high in toxicity at a relatively high concentration.
- urea water of low toxicity as a reducing agent precursor is preferably supplied by spraying.
- urea in urea water is mixed and in contact with exhaust gas in the exhaust pipe, and is thermally or hydrolytically resolved to liberate ammonia, a reducing agent.
- the reducing agent, etc., supplying nozzle 3 is of a heat-retaining double pipe structure as shown in FIG. 1 ( a ), even at low temperatures, a reducing agent or a reducing agent precursor such as urea water is hardly cooled in the reducing agent, etc., supplying nozzle, and hence is hardly stuck in the reducing agent, etc., supplying nozzle 3 and is stably supplied to exhaust gas.
- FIG. 1 ( a ) shows the outer side of the reducing agent, etc., supplying nozzle 3 is of a double pipe structure
- the invention is not limited to this.
- the inner side of the reducing agent, etc., supplying nozzle 3 may be of a double pipe structure.
- a space inside the double pipe structure, i.e., between an inner pipe 3 a and an outer pipe 3 b forming the double pipe structure, there may be a space, but the space is preferably filled with a heat retaining material or the like of low heat conductivity from the point of view of raising the capability to retain the heat.
- a heat retaining material 4 is provided in between the inner pipe 3 a and the outer pipe 3 b forming the double pipe structure of the reducing agent, etc., supplying nozzle 3 .
- the material, etc., of the heat retaining material 4 is not limited to a specific one.
- the double pipe structure also reinforces the reducing agent, etc., supplying nozzle 3 , the durability of the reducing agent, etc., supplying nozzle 3 is improved.
- exhaust gas flows through the exhaust pipe further in the downstream direction, and flows into the SCR catalyst 1 , where nitrogen oxide (NOx) contained in the exhaust gas is absorbed into the SCR catalyst 1 and selectively reduced and purged.
- NOx nitrogen oxide
- the exhaust pipe 2 is of a heat-retaining double pipe structure as shown in FIG. 1 ( b )
- exhaust gas heat is hard to be released outside the exhaust pipe, and the heat is retained inside the exhaust pipe.
- a reducing agent or a reducing agent precursor such as urea water supplied by spraying to exhaust gas is hardly cooled in the exhaust pipe.
- the reducing agent or reducing agent precursor such as urea water hardly precipitates in the exhaust pipe and is stably supplied to the SCR catalyst 1 together with exhaust gas.
- the inside of the exhaust pipe 2 being of a heat-retaining double pipe structure, its upstream side is fixed by a flange, while on the downstream side of the double pipe structure, the exhaust pipe inside gradually expands toward the downstream so as to allow exhaust gas to easily flow into the SCR catalyst 1 .
- the invention is not limited to this.
- the outside of the exhaust pipe 2 may be of a heat-retaining double pipe structure, or the downstream side of the double pipe structure may be fixed by not only a flange but also welding, bolts, or the like.
- the exhaust pipe inside may take a structure that expands stepwise.
- the space is preferably filled with a heat retaining material or the like of low heat conductivity from the point of view of raising the capability to retain the heat.
- the space is preferably filled with a heat retaining material or the like of low heat conductivity from the point of view of raising the capability to retain the heat.
- the SCR (Selective Catalytic Reduction) catalyst 1 may be made of any of titanium dioxide (TiO 2 ), vanadium pentoxide (V 2 O 5 ), tungstic trioxide (WO 3 ), molybdenum trioxide (MoO 3 ), silicon dioxide (SiO 2 ), sulfate, zeolite, etc., and combinations thereof. Also, the SCR catalyst 1 may be cased, or supported by a catalyst support having a honeycomb structure.
- the SCR muffler retains the heat of the reducing agent, etc., supplying nozzle and the exhaust pipe, thereby preventing the reduction of the efficiency of the SCR catalyst purging nitrogen oxide (NOx) even at low temperatures and improving the durability of the reducing agent, etc., supplying nozzle.
- NOx nitrogen oxide
Abstract
Description
- The present application claims priority from Japanese Patent Application No. 2004-35449 filed on Feb. 12, 2004, which is herein incorporated by reference.
- The present invention relates to an SCR muffler with an SCR catalyst for selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas.
- In these years, as to particulate matter (PM) and nitrogen oxide (NOx) contained in exhaust gas exhausted from internal combustion engines such as diesel-engines, the necessity of purging them is high because of the problem of environment pollution such as acid rain and photochemical smog.
- Accordingly, there is conventional technology in which, in the exhaust system of an internal combustion engine, a reducing agent or a reducing agent precursor such as urea water is supplied by spraying to exhaust gas via a reducing agent, etc., supplying nozzle from upstream of an SCR muffler having a selective reduction SCR (Selective Catalytic Reduction) catalyst, thereby selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas by the SCR catalyst. See, e.g., Japanese Patent Application Laid-Open Publication No. 2001-20724.
- Furthermore, since at low temperatures the efficiency of the SCR catalyst purging nitrogen oxide (NOx) is low, there is technology in which a muffler is made of a heat insulator or covered by a heat insulating cover, thereby retaining the heat of the SCR catalyst.
- However, with such conventional technology, the heat of the SCR catalyst itself is retained, but it is not that the heat of the reducing agent, etc., supplying nozzle and the exhaust pipe upstream of the catalyst is retained.
- Hence, there is the problem that at low temperatures a reducing agent or a reducing agent precursor such as urea water is cooled to be solidified in the reducing agent, etc., supplying nozzle and cannot be stably supplied to exhaust gas, thus being unable to prevent the reduction of the efficiency of the SCR catalyst purging nitrogen oxide (NOx).
- Furthermore, there is the problem that at low temperatures, even a reducing agent or a reducing agent precursor such as urea water mixed and in contact with exhaust gas is cooled to be solidified in the exhaust pipe before flowing into the SCR catalyst and hence cannot stably flow into the SCR catalyst, thus being unable to prevent the reduction of the efficiency of the SCR catalyst purging nitrogen oxide (NOx).
- Moreover, with conventional technology, there is the problem that a reducing agent, etc., supplying nozzle, which is affected by vibrations of the vehicle, exhaust gas, and the like, is subject to damage and deformation and is low in durability.
- Accordingly, an object of the present invention is to provide an SCR muffler that can retain the heat of the reducing agent, etc., supplying nozzle and the exhaust pipe, thereby preventing the reduction of the efficiency of the SCR catalyst purging nitrogen oxide (NOx) even at low temperatures and improving the durability of the reducing agent, etc., supplying nozzle.
- The present invention to solve the above problems is an SCR muffler which comprises an SCR catalyst for selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas; an exhaust pipe that allows the exhaust gas to flow into the SCR catalyst; and a reducing agent, etc., supplying nozzle that supplies a reducing agent or a reducing agent precursor to the exhaust gas. The SCR muffler is characterized in that the reducing agent, etc., supplying nozzle is of a double pipe structure.
- Further, the SCR muffler of the invention may be characterized in that a heat retaining material is provided in between an inner pipe and an outer pipe that form the double pipe structure.
- Alternatively, the SCR muffler of the invention may be characterized in that there is a space defined between an inner pipe and an outer pipe that form the double pipe structure.
- Another implementation of the invention is an SCR muffler which comprises an SCR catalyst for selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas; an exhaust pipe that allows the exhaust gas to flow into the SCR catalyst; and a reducing agent, etc., supplying nozzle that supplies a reducing agent or a reducing agent precursor to the exhaust gas. The SCR muffler is characterized in that the exhaust pipe is of a double pipe structure.
- The SCR muffler of the invention may be characterized in that a heat retaining material is provided in between an inner pipe and an outer pipe that form the double pipe structure.
- Alternatively, the SCR muffler of the invention may be characterized in that there is a space defined between an inner pipe and an outer pipe that form the double pipe structure.
-
FIG. 1 is a basic schematic view of an SCR muffler according to an embodiment of the present invention. - 1 SCR catalyst, 2 (2 a, 2 b) Exhaust pipe (inner and outer pipes), 3(3 a, 3 b) Reducing agent, etc., supplying nozzle (inner and outer pipes), 4 Heat retaining material
- The best mode for implementing an SCR muffler of the present invention will be described below with reference to the accompanying drawings.
-
FIG. 1 is a basic schematic view of an SCR muffler according to an embodiment of the present invention, which comprises anSCR catalyst 1 for selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas, anexhaust pipe 2 that allows exhaust gas to flow into theSCR catalyst 1, and a reducing agent, etc., supplyingnozzle 3 that supplies a reducing agent or a reducing agent precursor to exhaust gas, the reducing agent, etc., supplyingnozzle 3 or theexhaust pipe 2 having a heat-retaining double pipe structure. -
FIG. 1 (a) shows an SCR muffler with a reducing agent, etc., supplyingnozzle 3 having a heat-retaining double pipe structure, andFIG. 1 (b) shows an SCR muffler with anexhaust pipe 2 having a heat-retaining double pipe structure. - In the SCR muffler with such a configuration, exhaust gas passes through the
exhaust pipe 2 in a direction from upstream to downstream and flows into theSCR catalyst 1. - Exhaust gas is exhausted from an internal combustion engine such as a diesel-engine and contains as toxic substances unburned hydrocarbon (HC), carbon monoxide (CO), and nitrogen oxide (NOx) such as nitric monoxide (NO) and nitric dioxide (NO2).
- Such exhaust gas is supplied via the reducing agent, etc., supplying
nozzle 3 with a reducing agent or a reducing agent precursor during the time before flowing into theSCR catalyst 1. The reducing agent or reducing agent precursor includes a reducing agent precursor such as a substance that liberates a reducing agent, as well as a reducing agent itself, and may be any of hydrocarbon, cyanurate, ammonia, ammonium carbonate, ammonium carbamate, urea, and combinations of them. Furthermore, the reducing agent or reducing agent precursor may be in the form of any of solid, liquid, and gas. - For example, the reducing agent, etc., supplying
nozzle 3 may supply ammonia itself as a reducing agent, but ammonia is strong in smell and high in toxicity at a relatively high concentration. Hence, urea water of low toxicity as a reducing agent precursor is preferably supplied by spraying. In this case, urea in urea water is mixed and in contact with exhaust gas in the exhaust pipe, and is thermally or hydrolytically resolved to liberate ammonia, a reducing agent. - Where the reducing agent, etc., supplying
nozzle 3 is of a heat-retaining double pipe structure as shown inFIG. 1 (a), even at low temperatures, a reducing agent or a reducing agent precursor such as urea water is hardly cooled in the reducing agent, etc., supplying nozzle, and hence is hardly stuck in the reducing agent, etc., supplyingnozzle 3 and is stably supplied to exhaust gas. - Although
FIG. 1 (a) shows the outer side of the reducing agent, etc., supplyingnozzle 3 is of a double pipe structure, the invention is not limited to this. The inner side of the reducing agent, etc., supplyingnozzle 3 may be of a double pipe structure. - Also, inside the double pipe structure, i.e., between an
inner pipe 3 a and anouter pipe 3 b forming the double pipe structure, there may be a space, but the space is preferably filled with a heat retaining material or the like of low heat conductivity from the point of view of raising the capability to retain the heat. In the Figure, aheat retaining material 4 is provided in between theinner pipe 3 a and theouter pipe 3 b forming the double pipe structure of the reducing agent, etc., supplyingnozzle 3. The material, etc., of theheat retaining material 4 is not limited to a specific one. - Since the double pipe structure also reinforces the reducing agent, etc., supplying
nozzle 3, the durability of the reducing agent, etc., supplyingnozzle 3 is improved. - Thereafter, exhaust gas flows through the exhaust pipe further in the downstream direction, and flows into the
SCR catalyst 1, where nitrogen oxide (NOx) contained in the exhaust gas is absorbed into theSCR catalyst 1 and selectively reduced and purged. As a result, the nitrogen oxide (NOx) is transformed into nitrogen and water, which are gentle to the environment. - Meanwhile, where the
exhaust pipe 2 is of a heat-retaining double pipe structure as shown inFIG. 1 (b), exhaust gas heat is hard to be released outside the exhaust pipe, and the heat is retained inside the exhaust pipe. Hence, even at low temperatures, a reducing agent or a reducing agent precursor such as urea water supplied by spraying to exhaust gas is hardly cooled in the exhaust pipe. As a result, the reducing agent or reducing agent precursor such as urea water hardly precipitates in the exhaust pipe and is stably supplied to theSCR catalyst 1 together with exhaust gas. - In
FIG. 1 (b), the inside of theexhaust pipe 2 being of a heat-retaining double pipe structure, its upstream side is fixed by a flange, while on the downstream side of the double pipe structure, the exhaust pipe inside gradually expands toward the downstream so as to allow exhaust gas to easily flow into theSCR catalyst 1. However, the invention is not limited to this. For example, the outside of theexhaust pipe 2 may be of a heat-retaining double pipe structure, or the downstream side of the double pipe structure may be fixed by not only a flange but also welding, bolts, or the like. Alternatively, the exhaust pipe inside may take a structure that expands stepwise. - Also, inside the double pipe structure, i.e., between an
inner pipe 2 a and anouter pipe 2 b forming the double pipe structure, there may be a space, but the space is preferably filled with a heat retaining material or the like of low heat conductivity from the point of view of raising the capability to retain the heat. In the Figure, there is a space defined between theinner pipe 2 a and theouter pipe 2 b forming the double pipe structure of theexhaust pipe 2. - The SCR (Selective Catalytic Reduction)
catalyst 1 may be made of any of titanium dioxide (TiO2), vanadium pentoxide (V2O5), tungstic trioxide (WO3), molybdenum trioxide (MoO3), silicon dioxide (SiO2), sulfate, zeolite, etc., and combinations thereof. Also, theSCR catalyst 1 may be cased, or supported by a catalyst support having a honeycomb structure. - According to the present invention, the SCR muffler retains the heat of the reducing agent, etc., supplying nozzle and the exhaust pipe, thereby preventing the reduction of the efficiency of the SCR catalyst purging nitrogen oxide (NOx) even at low temperatures and improving the durability of the reducing agent, etc., supplying nozzle.
Claims (6)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2004035449 | 2004-02-12 | ||
JP2004035449A JP2005226528A (en) | 2004-02-12 | 2004-02-12 | Scr muffler |
PCT/JP2005/001457 WO2005078251A1 (en) | 2004-02-12 | 2005-02-02 | Scr muffler |
Publications (1)
Publication Number | Publication Date |
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US20070175204A1 true US20070175204A1 (en) | 2007-08-02 |
Family
ID=34857683
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/588,980 Abandoned US20070175204A1 (en) | 2004-02-12 | 2005-02-02 | SCR muffler |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070175204A1 (en) |
EP (1) | EP1715153A4 (en) |
JP (1) | JP2005226528A (en) |
CN (1) | CN1918370A (en) |
WO (1) | WO2005078251A1 (en) |
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US20110162358A1 (en) * | 2008-07-30 | 2011-07-07 | Emitec Gesellschaft Fur Emissionstechnologie Mbh | Exhaust gas purification system for diesel engines of utility motor vehicles |
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US9657362B2 (en) | 2012-05-31 | 2017-05-23 | Ud Trucks Corporation | Method for improving durability of exhaust pipe |
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US7328572B2 (en) * | 2006-02-23 | 2008-02-12 | Fleetguard, Inc. | Exhaust aftertreatment device with star-plugged turbulator |
DE102007048560A1 (en) | 2007-10-09 | 2009-04-23 | Audi Ag | Device for post-treatment of exhaust gases of a lean-running internal combustion engine |
KR100999614B1 (en) * | 2007-12-14 | 2010-12-08 | 기아자동차주식회사 | Apparatus for reducing nitrogen oxide in exhaust pipe |
DE102009041592A1 (en) * | 2009-09-15 | 2011-04-14 | Huber Automotive Ag | Device for hydrolytic production of ammonia in silicon-controlled rectifier-exhaust system for internal combustion engine, has exhaust gas pipe for conducting exhaust gas flow to silicon-controlled rectifier-catalyzer |
JP5693061B2 (en) * | 2010-06-30 | 2015-04-01 | 三菱重工業株式会社 | Exhaust gas treatment equipment |
JP2013119773A (en) * | 2011-12-06 | 2013-06-17 | Ud Trucks Corp | Exhaust emission control device |
JP2013119772A (en) | 2011-12-06 | 2013-06-17 | Ud Trucks Corp | Exhaust emission control device |
KR20200019781A (en) * | 2013-03-28 | 2020-02-24 | 얀마 가부시키가이샤 | Engine device |
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US20070261393A1 (en) * | 2006-05-05 | 2007-11-15 | Christian Stiebinger | Multi-Cylinder Internal Combustion Engine |
US20110162358A1 (en) * | 2008-07-30 | 2011-07-07 | Emitec Gesellschaft Fur Emissionstechnologie Mbh | Exhaust gas purification system for diesel engines of utility motor vehicles |
US9784161B2 (en) | 2008-07-30 | 2017-10-10 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Exhaust gas purification system for diesel engines of utility motor vehicles |
US9657362B2 (en) | 2012-05-31 | 2017-05-23 | Ud Trucks Corporation | Method for improving durability of exhaust pipe |
RU2609009C2 (en) * | 2012-12-21 | 2017-01-30 | Сканиа Св Аб | Device to feed fluid into internal combustion engine exhaust gases |
WO2014098728A1 (en) * | 2012-12-21 | 2014-06-26 | Scania Cv Ab | Arrangement to insert a liquid medium into exhausts from a combustion engine |
US10724418B2 (en) * | 2015-02-17 | 2020-07-28 | Scania Cv Ab | Method and a system for determining a flow resistance across a particulate filter |
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US10337380B2 (en) | 2017-07-07 | 2019-07-02 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer for a vehicle exhaust system |
US10287948B1 (en) | 2018-04-23 | 2019-05-14 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
US10316721B1 (en) | 2018-04-23 | 2019-06-11 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
US10787946B2 (en) | 2018-09-19 | 2020-09-29 | Faurecia Emissions Control Technologies, Usa, Llc | Heated dosing mixer |
CN114829754A (en) * | 2019-12-12 | 2022-07-29 | 斯堪尼亚商用车有限公司 | Exhaust gas additive dosing system including a turbocharger |
US20230019174A1 (en) * | 2019-12-12 | 2023-01-19 | Scania Cv Ab | Exhaust additive dosing system comprising a turbocharger |
US11725559B2 (en) * | 2019-12-12 | 2023-08-15 | Scania Cv Ab | Exhaust additive dosing system comprising a turbocharger |
Also Published As
Publication number | Publication date |
---|---|
JP2005226528A (en) | 2005-08-25 |
EP1715153A1 (en) | 2006-10-25 |
EP1715153A4 (en) | 2007-02-14 |
CN1918370A (en) | 2007-02-21 |
WO2005078251A1 (en) | 2005-08-25 |
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