US20030230072A1 - Urea injector in exhaust gas turbine housing - Google Patents
Urea injector in exhaust gas turbine housing Download PDFInfo
- Publication number
- US20030230072A1 US20030230072A1 US10/248,073 US24807302A US2003230072A1 US 20030230072 A1 US20030230072 A1 US 20030230072A1 US 24807302 A US24807302 A US 24807302A US 2003230072 A1 US2003230072 A1 US 2003230072A1
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- US
- United States
- Prior art keywords
- urea
- injector
- turbine
- housing
- arrangement
- 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.)
- Granted
Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000004202 carbamide Substances 0.000 title claims abstract description 63
- 238000002485 combustion reaction Methods 0.000 claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 23
- 230000003068 static effect Effects 0.000 claims description 21
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims 2
- 239000000314 lubricant Substances 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- F01N3/2066—Selective catalytic reduction [SCR]
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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 a combustion engine in which the emission level of nitrogen oxides emitted to the environment is reduced by means of injecting urea into the exhaust pipe.
- the present invention also relates to a vehicle utilizing such an engine.
- a number of previously known methods can be utilized in order to reduce the amount of NOx in the exhaust gases. For instance, the combustion process can be cooled down by means of recirculation of exhaust gases, or the introduction of cooling medium in the form of water into the combustion chambers can be performed. These processes are utilized in order to reduce the formation of NOx in the combustion process. Another possibility is to reduce the amount of NOx in exhaust gases that have already been formed.
- One method for reducing the NOx content occurring in exhaust gases is to reduce NOx in a selective, reducing catalytic converter where reduction of NOx takes place influenced by urea. Accordingly, for this purpose, urea is injected into the exhaust pipe of the combustion engine, whereafter reaction takes place in a reaction chamber.
- the injected urea passes through the entire turbine housing and, accordingly, also in the vicinity of the rotational shaft of the turbine wheel that is mounted in bearings in the housing enclosing the turbine wheel.
- the rotational shaft is mounted in bearings in a through-hole in the housing.
- An object of the present invention is to provide a combustion engine in which urea is injected into the exhaust pipe of the combustion engine. Thorough mixing of the urea and exhaust gases is accomplished by at least partially passing these contents through a turbine step, but in such a way that the risk of degradation of a bearing assembly, seals and lubricant for a rotational shaft of a turbine wheel included at the turbine step is reduced.
- an injector for injecting urea into the housing which encloses the turbine wheel included in the turbine step injection is enabled in such a position that the risk of bearing assembly, seals and lubricant for the rotation axis being degraded is reduced.
- the injector is arranged in the chamber that encloses the turbine wheel, preferably downstream of the largest diameter of the turbine wheel.
- the injector jet is positioned in the turbine housing in a position where a mean flow trajectory does not pass past the through-hole for the turbine shaft.
- the injector jet can be located upstream the largest diameter of the turbine wheel, and that the static pressure at the injector jet may exceed the static pressure at the through-hole for the turbine shaft, but that there is a high probability that the particle trajectory for the injected urea does not pass past the through-hole, wherein a reduction of the exposure of the through-hole to urea is obtained, and the risk of bearing assembly, seals and lubricant being degraded is reduced.
- FIG. 1 shows a schematic illustration of a combustion engine configured according to the invention
- FIG. 2 shows an enlargement of the region 11 in FIG. 1;
- FIG. 3 shows a simplified, two-dimensional illustration of the pressure at different positions inside the turbine housing.
- FIG. 1 is a schematic representation of a combustion engine 1 .
- the combustion engine 1 is preferably constituted by a diesel engine, or alternatively a petrol engine, and which is adapted for lean operation; that is, a so-called lean-burn engine.
- An inlet manifold 2 is connected to the combustion engine for air supply to the engine.
- an exhaust pipe 3 is connected to the outlet ports of the combustion engine 1 .
- the combustion engine 1 is exemplarily of a conventional type, which is the reason why the remaining components required for the operation of the engine are not described in any greater detail.
- a turbine housing 4 is connected to the exhaust pipe 3 .
- the connection between the turbine housing 4 and the exhaust pipe 3 can be designed as a flange joint 5 whereby the turbine housing 4 and the exhaust pipe 3 are connected. Accordingly, the turbine housing exhibits an inlet opening 6 and an outlet opening 7 connected to an exhaust pipe.
- a chamber 8 in which a turbine wheel 9 is arranged is located between the inlet opening 6 and the outlet opening. The turbine wheel 9 is supported by a rotational shaft 10 which extends through a through-hole 11 in the turbine housing 4 .
- FIG. 2 shows an embodiment of the bearing assembly of the rotational shaft 10 in the through-hole 11 in greater detail.
- a sealing member 12 which prevents leakage out from the chamber 8 into the environment, is arranged.
- a leakage in the exhaust pipe also results in power loss, since a loss of pressure occurs in the exhaust pipe without any possibility to recover the energy in the exhaust gases.
- the sealing member 12 rests against a protrusion 13 arranged in the housing 4 .
- a spacing member 14 which can be constituted by a portion of a bearing assembly 15 .
- the bearing assembly is constituted by a conventional plain bearing 15 which is secured by a locking washer 17 arranged in a groove 18 .
- the turbine housing 4 is provided with an orifice 19 of an injector 20 for injecting urea into the turbine housing 4 while the combustion engine 1 is in a predetermined operating condition.
- the injector 20 is connected to a control unit 21 which, via a set of input channels 22 , obtains information about relevant vehicle or engine data, such as load, engine speed, engine temperature, and the like.
- the control unit is of a conventional type therefore will not be described in any greater detail.
- the injector 20 can be of a conventional type.
- the one shown in FIG. 1 can include a piston 24 arranged inside a cylinder 23 .
- the piston 24 divides the cylinder into a first portion facing an orifice 25 that forms a duct (together with a duct of a through-hole located in the turbine housing 4 ) that terminates in an injection orifice 19 .
- a second portion includes a means or arrangement 28 for pressurizing the urea contained in the first portion, and as a result of such pressuring, the urea in the first portion is caused to be injected into the turbine housing 4 .
- the injector 20 is connected to the turbine housing 4 by means of screwing an externally threaded portion of the injector 20 into a recess in the turbine housing 4 that has a mating internal thread.
- a supply duct 26 which connects a urea container 27 to the first portion of the cylinder 23 , is arranged for supplying urea to the first portion of the cylinder 23 .
- the pressuring means or arrangement 28 to pressurize the urea in the first portion of the cylinder 23 , for example by acting on the piston 24 , the urea is injected into the turbine housing 4 .
- the injector 20 may be established through the utilization of an on/off-valve that opens and closes an inlet port leading into the turbine housing 4 .
- a conventional pump can be arranged for pressurizing the urea in order to enable transport into the turbine housing 4 when the valve is opened.
- the injector jet can be specially arranged at the turbine housing for jetting the urea either from a specific location, or in a specific direction within the exhaust system.
- this unique configuration may be considered a special aiming of the injection of the urea at or near the turbine housing.
- the injector jet is installed at the chamber 8 that encloses the turbine wheel at a location downstream of a largest diameter of the turbine wheel 9 .
- the injector discharges into the chamber within a region where the static pressure is lower than the static pressure at the through-hole for the rotational shaft. As a result of this position, the exposure of the through-hole to urea is reduced even further.
- the injector discharges into the housing from a position where a mean flow trajectory does not pass past the through-hole.
- mean flow trajectory refers to the trajectory a particle having a certain kinetic energy and direction of movement will exhibit when it is introduced into the exhaust gas flow. Since the flow is turbulent, the trajectory will not be identical in every case. Accordingly, “mean flow trajectory” refers to the trajectory an average of the introduced particles will exhibit. “Passes past the through-hole of the rotational shaft” means that a particle trajectory flows through a boundary layer surrounding the through-hole where the probability of passage through the through-hole into the bearing assembly of the rotational shaft is high. This boundary layer is relatively thin and of the magnitude of 1-10 mm.
- FIG. 3 shows a simplified diagram of the static pressure through the turbine housing.
- the static pressure, P as a function of a transformed longitudinal coordinate Z, which has its zero value at the inlet opening 6 of the turbine housing and the value Z 1 at the outlet opening 7 of the turbine housing.
- the static pressure at the through-hole 11 for the rotational shaft 10 is P(Z 2 ).
- the injector jet can be positioned in different positions in the turbine housing, for example in the position Zm 1 where the static pressure exceeds the static pressure at the through-hole, or in the position Zm 2 where the static pressure is lower than the static pressure at the through-hole. Should the injector jet be positioned in the position Zm 1 : that is, where the static pressure exceeds the static pressure at the through-hole, the injector will then preferably be directed in a downstream direction so that the risk of exposure to urea is reduced at the through-hole.
- the injector jet can be directed or aimed upwards, that is upstream toward the hole 11 for improving the mixing degree of urea and exhaust gas.
- the initial velocity of the injected urea into the exhaust flow should be adapted so that a mean flow trajectory of the urea does not pass past the through-hole 11 .
Abstract
Description
- This application is a continuation patent application of International Application No. PCT/SE01/01304 filed Jun. 8, 2001 which was published in English pursuant to Article 21(2) of the Patent Cooperation Treaty, and which claims priority to Swedish Application No. 0002229-3 filed Jun. 14, 2000. Both applications are expressly incorporated herein by reference in their entireties.
- 1. Technical Field
- The present invention relates to a combustion engine in which the emission level of nitrogen oxides emitted to the environment is reduced by means of injecting urea into the exhaust pipe. The present invention also relates to a vehicle utilizing such an engine.
- 2. Background of the Invention
- Diesel and petrol engines that are designed for lean operation, so-called lean-burn engines, exhibit good properties where fuel economy is concerned, though in normal operation generate particles and nitrogen oxides, NOx. A number of previously known methods can be utilized in order to reduce the amount of NOx in the exhaust gases. For instance, the combustion process can be cooled down by means of recirculation of exhaust gases, or the introduction of cooling medium in the form of water into the combustion chambers can be performed. These processes are utilized in order to reduce the formation of NOx in the combustion process. Another possibility is to reduce the amount of NOx in exhaust gases that have already been formed. One method for reducing the NOx content occurring in exhaust gases is to reduce NOx in a selective, reducing catalytic converter where reduction of NOx takes place influenced by urea. Accordingly, for this purpose, urea is injected into the exhaust pipe of the combustion engine, whereafter reaction takes place in a reaction chamber.
- An example of a device for NOx-reduction at a combustion engine is disclosed in U.S. Pat. No. 5,976,475, the disclosure of which is hereby incorporated herein by reference. In order to obtain high efficiency of the injected urea quantity in relation to the amount of NOx present in the exhaust pipe, it is required that the injected urea be mixed thoroughly with the exhaust gases. This is of particular importance, since the time of exposure inside the exhaust pipe is short as a result of the relatively high flow rate through the system. In the device disclosed in the above-mentioned document, urea is injected upstream of a turbine located in the exhaust pipe in order to achieve a thorough mixing of exhaust gases and urea.
- As a result of the positioning of the injection site upstream of the turbine, the injected urea passes through the entire turbine housing and, accordingly, also in the vicinity of the rotational shaft of the turbine wheel that is mounted in bearings in the housing enclosing the turbine wheel. The rotational shaft is mounted in bearings in a through-hole in the housing. When the urea passes this through-hole, there is a risk of urea penetrating the bearing assembly of the rotational shaft in the housing, since the pressure inside the housing is higher than the ambient pressure. Since urea is very reactive and aggressive, there is a risk of the urea degrading the bearing assembly, seals and lubricant that are present therein.
- An object of the present invention is to provide a combustion engine in which urea is injected into the exhaust pipe of the combustion engine. Thorough mixing of the urea and exhaust gases is accomplished by at least partially passing these contents through a turbine step, but in such a way that the risk of degradation of a bearing assembly, seals and lubricant for a rotational shaft of a turbine wheel included at the turbine step is reduced. By means of arranging an injector for injecting urea into the housing which encloses the turbine wheel included in the turbine step, injection is enabled in such a position that the risk of bearing assembly, seals and lubricant for the rotation axis being degraded is reduced.
- In a preferred embodiment, the injector is arranged in the chamber that encloses the turbine wheel, preferably downstream of the largest diameter of the turbine wheel. By arranging the injector jet within a region where the static pressure is lower than the static pressure at the through-hole for the rotational shaft, the risk of the through-hole being exposed to urea is reduced even further.
- Furthermore, according to another preferred embodiment of the invention, the injector jet is positioned in the turbine housing in a position where a mean flow trajectory does not pass past the through-hole for the turbine shaft. This means that the injector jet can be located upstream the largest diameter of the turbine wheel, and that the static pressure at the injector jet may exceed the static pressure at the through-hole for the turbine shaft, but that there is a high probability that the particle trajectory for the injected urea does not pass past the through-hole, wherein a reduction of the exposure of the through-hole to urea is obtained, and the risk of bearing assembly, seals and lubricant being degraded is reduced.
- In the following, the invention will be described in greater detail with reference to attached drawings, in which:
- FIG. 1 shows a schematic illustration of a combustion engine configured according to the invention;
- FIG. 2 shows an enlargement of the
region 11 in FIG. 1; and - FIG. 3 shows a simplified, two-dimensional illustration of the pressure at different positions inside the turbine housing.
- FIG. 1 is a schematic representation of a
combustion engine 1. Thecombustion engine 1 is preferably constituted by a diesel engine, or alternatively a petrol engine, and which is adapted for lean operation; that is, a so-called lean-burn engine. An inlet manifold 2 is connected to the combustion engine for air supply to the engine. Furthermore, anexhaust pipe 3 is connected to the outlet ports of thecombustion engine 1. Thecombustion engine 1 is exemplarily of a conventional type, which is the reason why the remaining components required for the operation of the engine are not described in any greater detail. - A
turbine housing 4 is connected to theexhaust pipe 3. The connection between theturbine housing 4 and theexhaust pipe 3 can be designed as aflange joint 5 whereby the turbine housing 4 and theexhaust pipe 3 are connected. Accordingly, the turbine housing exhibits an inlet opening 6 and an outlet opening 7 connected to an exhaust pipe. Achamber 8 in which a turbine wheel 9 is arranged is located between the inlet opening 6 and the outlet opening. The turbine wheel 9 is supported by arotational shaft 10 which extends through a through-hole 11 in theturbine housing 4. - FIG. 2 shows an embodiment of the bearing assembly of the
rotational shaft 10 in the through-hole 11 in greater detail. Closest to the orifice of the through-hole 11 into thechamber 8, a sealingmember 12, which prevents leakage out from thechamber 8 into the environment, is arranged. In addition to the above-mentioned degradation of lubricant in the bearing assembly of therotational shaft 10, a leakage in the exhaust pipe also results in power loss, since a loss of pressure occurs in the exhaust pipe without any possibility to recover the energy in the exhaust gases. In a direction towards the orifice of the through-hole 11 into thechamber 8, the sealingmember 12 rests against aprotrusion 13 arranged in thehousing 4. The end of the sealingmember 12 facing away from the orifice rests against aspacing member 14, which can be constituted by a portion of abearing assembly 15. In one embodiment, the bearing assembly is constituted by a conventional plain bearing 15 which is secured by alocking washer 17 arranged in agroove 18. - Furthermore, according to the invention, the
turbine housing 4 is provided with anorifice 19 of aninjector 20 for injecting urea into theturbine housing 4 while thecombustion engine 1 is in a predetermined operating condition. In order to verify that the injection is performed in the correct way, according to one embodiment of the invention, theinjector 20 is connected to acontrol unit 21 which, via a set ofinput channels 22, obtains information about relevant vehicle or engine data, such as load, engine speed, engine temperature, and the like. The control unit is of a conventional type therefore will not be described in any greater detail. - The
injector 20 can be of a conventional type. For example, the one shown in FIG. 1 can include apiston 24 arranged inside acylinder 23. Thepiston 24 divides the cylinder into a first portion facing anorifice 25 that forms a duct (together with a duct of a through-hole located in the turbine housing 4) that terminates in aninjection orifice 19. A second portion includes a means orarrangement 28 for pressurizing the urea contained in the first portion, and as a result of such pressuring, the urea in the first portion is caused to be injected into theturbine housing 4. Conveniently, theinjector 20 is connected to theturbine housing 4 by means of screwing an externally threaded portion of theinjector 20 into a recess in theturbine housing 4 that has a mating internal thread. Asupply duct 26, which connects aurea container 27 to the first portion of thecylinder 23, is arranged for supplying urea to the first portion of thecylinder 23. By utilizing the pressuring means orarrangement 28 to pressurize the urea in the first portion of thecylinder 23, for example by acting on thepiston 24, the urea is injected into theturbine housing 4. In another embodiment of the invention, theinjector 20 may be established through the utilization of an on/off-valve that opens and closes an inlet port leading into theturbine housing 4. In this configuration, a conventional pump can be arranged for pressurizing the urea in order to enable transport into theturbine housing 4 when the valve is opened. - In another aspect of the invention, the injector jet can be specially arranged at the turbine housing for jetting the urea either from a specific location, or in a specific direction within the exhaust system. Regarding this second aspect, this unique configuration may be considered a special aiming of the injection of the urea at or near the turbine housing. In a preferred embodiment, the injector jet is installed at the
chamber 8 that encloses the turbine wheel at a location downstream of a largest diameter of the turbine wheel 9. As a result of this position, passage of urea into the through-hole 11 in theturbine housing 4 for therotational shaft 10 is made more difficult, wherein degradation of bearing assembly, seals and lubricants placed within the lead-through is reduced. - In another preferred embodiment, the injector discharges into the chamber within a region where the static pressure is lower than the static pressure at the through-hole for the rotational shaft. As a result of this position, the exposure of the through-hole to urea is reduced even further.
- In still another embodiment of the invention, the injector discharges into the housing from a position where a mean flow trajectory does not pass past the through-hole. In this respect, “mean flow trajectory” refers to the trajectory a particle having a certain kinetic energy and direction of movement will exhibit when it is introduced into the exhaust gas flow. Since the flow is turbulent, the trajectory will not be identical in every case. Accordingly, “mean flow trajectory” refers to the trajectory an average of the introduced particles will exhibit. “Passes past the through-hole of the rotational shaft” means that a particle trajectory flows through a boundary layer surrounding the through-hole where the probability of passage through the through-hole into the bearing assembly of the rotational shaft is high. This boundary layer is relatively thin and of the magnitude of 1-10 mm.
- FIG. 3 shows a simplified diagram of the static pressure through the turbine housing. The static pressure, P, as a function of a transformed longitudinal coordinate Z, which has its zero value at the inlet opening6 of the turbine housing and the value Z1 at the
outlet opening 7 of the turbine housing. There is of course also a pressure variation in a radial direction of the turbine; this, however, is neglected in order to provide a more simplified illustration of the pressure variation. The static pressure at the through-hole 11 for therotational shaft 10 is P(Z2). The injector jet can be positioned in different positions in the turbine housing, for example in the position Zm1 where the static pressure exceeds the static pressure at the through-hole, or in the position Zm2 where the static pressure is lower than the static pressure at the through-hole. Should the injector jet be positioned in the position Zm1: that is, where the static pressure exceeds the static pressure at the through-hole, the injector will then preferably be directed in a downstream direction so that the risk of exposure to urea is reduced at the through-hole. Should the injector jet be positioned sufficiently far downstream of thechamber 8 in thehousing 4 that there is little risk of exposure to urea at the through-hole 11, such as in the position characterized as Zm3, the injector jet can be directed or aimed upwards, that is upstream toward thehole 11 for improving the mixing degree of urea and exhaust gas. In this respect, the initial velocity of the injected urea into the exhaust flow should be adapted so that a mean flow trajectory of the urea does not pass past the through-hole 11.
Claims (19)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0002229-3 | 2000-06-14 | ||
SE0002229A SE516624C2 (en) | 2000-06-14 | 2000-06-14 | Apparatus for injecting urea into a turbine housing in an exhaust system |
PCT/SE2001/001304 WO2001096718A1 (en) | 2000-06-14 | 2001-06-08 | Urea injector in exhaust gas turbine housing |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2001/001304 Continuation WO2001096718A1 (en) | 2000-06-14 | 2001-06-08 | Urea injector in exhaust gas turbine housing |
Publications (3)
Publication Number | Publication Date |
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US20030230072A1 true US20030230072A1 (en) | 2003-12-18 |
US20040103643A2 US20040103643A2 (en) | 2004-06-03 |
US6883308B2 US6883308B2 (en) | 2005-04-26 |
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ID=20280091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/248,073 Expired - Fee Related US6883308B2 (en) | 2000-06-14 | 2002-12-16 | Urea injector in exhaust gas turbine housing |
Country Status (8)
Country | Link |
---|---|
US (1) | US6883308B2 (en) |
EP (1) | EP1295016B1 (en) |
JP (1) | JP4659330B2 (en) |
AU (1) | AU2001264507A1 (en) |
BR (1) | BR0111705B1 (en) |
DE (1) | DE60122886T2 (en) |
SE (1) | SE516624C2 (en) |
WO (1) | WO2001096718A1 (en) |
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US7966811B2 (en) * | 2007-11-30 | 2011-06-28 | Perkins Engines Company Limited | Exhaust treatment system having a diverter valve |
DE102009014361A1 (en) * | 2009-03-21 | 2010-09-23 | Daimler Ag | Exhaust gas treatment device and method for operating an exhaust gas treatment device |
JP5768331B2 (en) * | 2010-06-11 | 2015-08-26 | いすゞ自動車株式会社 | Exhaust pipe fuel injection system |
JP5768330B2 (en) | 2010-06-11 | 2015-08-26 | いすゞ自動車株式会社 | Exhaust pipe fuel injection system |
US8756921B2 (en) | 2011-01-10 | 2014-06-24 | Paccar Inc | Reductant delivery device |
US9115641B2 (en) | 2012-08-20 | 2015-08-25 | General Electric Company | Methods and systems for an engine |
US9874129B2 (en) | 2016-04-05 | 2018-01-23 | Ford Global Technologies, Llc | SCR device |
GB2552482A (en) * | 2016-07-25 | 2018-01-31 | Jaguar Land Rover Ltd | Direct injection of gas into a turbine volute |
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- 2001-06-08 WO PCT/SE2001/001304 patent/WO2001096718A1/en active IP Right Grant
- 2001-06-08 AU AU2001264507A patent/AU2001264507A1/en not_active Abandoned
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- 2001-06-08 BR BRPI0111705-0A patent/BR0111705B1/en not_active IP Right Cessation
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US20060101811A1 (en) * | 2004-10-29 | 2006-05-18 | Jan-Roger Linna | Reducing agent metering system for reducing NOx in lean burn internal combustion engines |
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US11015508B2 (en) | 2016-10-26 | 2021-05-25 | Scania Cv Ab | Exhaust additive dosing system comprising an exhaust additive distribution device and an exhaust additive metering device |
Also Published As
Publication number | Publication date |
---|---|
BR0111705B1 (en) | 2010-02-23 |
EP1295016A1 (en) | 2003-03-26 |
US6883308B2 (en) | 2005-04-26 |
US20040103643A2 (en) | 2004-06-03 |
AU2001264507A1 (en) | 2001-12-24 |
SE516624C2 (en) | 2002-02-05 |
SE0002229D0 (en) | 2000-06-14 |
BR0111705A (en) | 2003-07-08 |
SE0002229L (en) | 2001-12-15 |
DE60122886D1 (en) | 2006-10-19 |
JP4659330B2 (en) | 2011-03-30 |
EP1295016B1 (en) | 2006-09-06 |
JP2004503706A (en) | 2004-02-05 |
DE60122886T2 (en) | 2007-05-10 |
WO2001096718A1 (en) | 2001-12-20 |
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