WO2016169709A1 - Vorrichtung zum einbringen eines fluids in einen gasstrom - Google Patents
Vorrichtung zum einbringen eines fluids in einen gasstrom Download PDFInfo
- Publication number
- WO2016169709A1 WO2016169709A1 PCT/EP2016/056161 EP2016056161W WO2016169709A1 WO 2016169709 A1 WO2016169709 A1 WO 2016169709A1 EP 2016056161 W EP2016056161 W EP 2016056161W WO 2016169709 A1 WO2016169709 A1 WO 2016169709A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- protective sleeve
- wall
- gas
- doing
- mixing chamber
- 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.)
- Ceased
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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
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
- F01N3/2066—Selective catalytic reduction [SCR]
-
- 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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
-
- 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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
-
- 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
-
- 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
- F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
-
- 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
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- 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 arrangement for introducing a fluid into a gas stream, in particular a reducing agent in an exhaust stream of an internal combustion engine.
- the urea solution is introduced into the exhaust gas stream in a well-defined form.
- the introduced into the exhaust stream urea solution is evaporated as completely as possible and evenly distributed in the exhaust gas stream.
- the urea solution is injected or sprayed through a metering device into the exhaust gas line, which is flowed obliquely or laterally from the exhaust gas flow. This can lead to the sprayed-on reducing agent being blown away. Often the added additive forms a spray cone. Due to the exhaust gas flow this is deformed and may even be pressed against the walls of the exhaust system.
- the injected fluid is distributed less well, resulting in a reduction in the efficiency of catalysis.
- unwanted deposits of the fluid may form inside the device, especially in the area around the metering device, which may also lead to a reduction in the efficiency or even failure of the device or the exhaust gas cleaning system.
- the device has a mixing chamber and a metering device.
- the fluid can be introduced by the metering device by means of a metering tip into an injection space defined by a protective sleeve.
- the injection space is located inside the chamber and in fluid communication therewith.
- the protective sleeve has a circumferentially extending intermediate chamber, which is bounded radially on the inside by an inner wall and radially on the outside by an outer wall.
- the intermediate chamber is in fluid communication with the injection space via a gap formed by or formed on the inner wall, in particular an annular gap.
- the intermediate chamber is in fluid communication with the mixing chamber via at least one opening, in particular a plurality of openings, in the outer wall.
- the fluid is introduced by means of the metering tip of the metering device into the injection space defined by the protective sleeve.
- the injection space is open towards the mixing chamber.
- the protective sleeve thus forms a kind Shielding that prevents the gas from flowing directly to the dosing tip.
- the protective sleeve also protects - at least initially - the injection cone, which leads to a better distribution of the fluid in the gas stream.
- the protective sleeve acts as a kind of "flushing device" to protect the dosing tip by a flow of gas around the formation of deposits. Part of the gas flowing against the protective sleeve can in fact penetrate through the openings in the outer wall of the protective sleeve into the intermediate chamber.
- the gas flows through the gap forming a constriction into the injection space.
- the exhaust gas flowing through the gap into the injection space can be guided in such a way that it at least largely prevents the formation of deposits in the area of the injection space and in particular of the metering tip.
- the gap surrounds the dosing tip in the circumferential direction at least partially, preferably completely.
- the gap is arranged such that at least a portion of the gas flow flowing through it backwashes the metering tip.
- the gap may be shaped in the axial direction, i. in the direction of introduction of the fluid, seen - be approximately at the level of the dosing or even arranged in front of it.
- At least one guide element may be arranged in the gap, through which at least part of the gas flow flowing through it is impressed by a swirl component.
- a swirl component such as a vortex can help to prevent the formation of deposits even more efficiently.
- the swirl ensures that the flow of a contour of the inner wall defining the injection space better follows, so that flow separation is minimized.
- a part of a wall of the mixing chamber limits the intermediate chamber at least in sections. In particular, it limits these in the area around the dosing tip.
- the protective sleeve may for example be attached to the wall of the mixing chamber, in particular via its outer wall, so that the wall of the mixing chamber and the inner and outer walls of the protective sleeve together define the intermediate chamber.
- an end of the intermediate chamber facing the dosing tip may be bounded, at least in sections, by a bottom section of the protective sleeve.
- the bottom portion of the protective sleeve is connected to the outer wall or integrally formed therewith. The bottom portion may be spaced from the wall of the mixing chamber. This provides a flow path between the protective sleeve and the mixing chamber wall which contributes to (additional) backwashing of the dosing tip to further reduce the formation of deposits.
- the gap can be bounded by an end portion of the inner wall facing the metering tip, a part of a wall of the mixing chamber which partially delimits the intermediate chamber and / or, if provided, the bottom portion of the protective sleeve.
- the inner wall is at her the
- Dosing tip end provided with a collar which projects into the intermediate chamber to efficiently direct the flow of gas through the gap. That in one embodiment of the device according to the invention, the end portion of the inner wall of the sleeve - with or without collar - is spaced from the wall of the mixing chamber or the bottom portion to form the gap.
- the at least one opening in the outer wall may be a bore, a slot and / or a slot.
- a plurality of openings are provided, which are preferably distributed uniformly in the circumferential direction.
- the inner wall has a funnel-shaped or conical section which opens in a direction away from the metering tip. That said portion diverges in the direction of introduction of the fluid to accommodate its "unfolding".
- the inner wall is formed without interruption, so that the gas can only pass through the gap from the intermediate chamber into the injection space.
- the outer wall may also have a funnel-shaped or conical section which opens in a direction towards the metering tip. That In this embodiment, said portion converges in the direction of introduction of the fluid.
- the protective sleeve this is integrally formed.
- the inner wall and the outer wall of the protective sleeve may be separately manufactured elements which are connected to each other, in particular welded or soldered together.
- the connection between the inner wall and the outer wall may, for example, be provided at the ends facing away from the dosing tip.
- the protective sleeve is formed substantially rotationally symmetrical. In order to take into account special flow conditions, however, an asymmetrical design can also be provided.
- the mixing chamber may have at least one inlet opening, which is arranged and designed such that the protective sleeve, in particular its outer wall, of at least part of the inflowing into the mixing chamber
- Gas stream is flown.
- each of the inlet openings can be assigned to at least one, in particular exactly one, opening in the outer wall of the protective sleeve.
- a gas guide element may be arranged, which feeds at least a part of the gas flow of the protective sleeve.
- the gas-conducting element can be connected to the protective sleeve and protrude into the gas flow flowing to the protective sleeve.
- an upstream end of the gas guiding element is arranged substantially parallel to the gas flow to prevent the generation of unnecessary turbulence.
- the gas-conducting element can be a separate component which-as mentioned above-is or is not connected to the protective sleeve.
- the gas-conducting element can also be formed by a section of the outer wall of the protective sleeve.
- the gas guiding element is associated with the at least one opening in the outer wall of the protective sleeve in order to direct a part of the gas flow in or through the opening, so that it passes into the intermediate chamber.
- the gas guide element is arranged in the region of the opening.
- the gas guide is at least partially formed by a portion of the outer wall of the protective sleeve, which has been bent out, for example, to form the at least one opening in the outer wall.
- the gas guiding element may have a section which is U-shaped or has the shape of an incomplete U. It is conceivable, for example, that the gas guide element is bent out of the outer wall, so that it merges into the outer wall in a bend. In the further course, the gas-conducting element can be shaped accordingly in order to direct a desired subset of the gas flow into the intermediate chamber.
- the gas guiding element may have openings, e.g. Holes have.
- the openings are arranged in a region which is arranged adjacent to the protective sleeve.
- the bypass flow path is defined at least in sections by a wall of the mixing chamber and an end of the protective sleeve facing away from the metering tip.
- the wall of the mixing chamber may have an inwardly directed bead, which is arranged in the axial direction of the mixing chamber approximately at the level of the protective sleeve.
- Einsprühkegels may be arranged in the mixing chamber, a Gasleitrohr whose outer periphery is spaced from the wall of the mixing chamber.
- the wall of the mixer chamber and the outer The circumference of the gas guide thus define in sections a gap through which gas can flow.
- the Gasleitrohr is arranged in particular downstream of the metering device.
- at least one flow guide may be arranged to impart a well-defined flow pattern to the gas flowing through the gap.
- a swirl is imparted to the gas flow by one or preferably a plurality of flow guide elements arranged distributed in the circumferential direction of the gap.
- the one or more flow guide elements are arranged in particular on the input side of the gap.
- At least one flow guide element is arranged in the gas guide tube.
- at least one flow-guiding element protrudes at least in sections into the gas-conducting tube or is arranged completely therein.
- a flow-guiding element is provided at the inlet-side end of the gas-conducting tube, which at least partially projects into the gas-conducting tube and / or is in communication with the inner circumference of the gas-conducting tube.
- a plurality of flow guide elements are provided.
- the at least one flow guide element can be arranged between the protective sleeve and the gas guide tube.
- the at least one flow-guiding element is arranged at least in sections in a gap or gap between the protective sleeve and the gas-conducting tube.
- a plurality of flow directing elements are provided which impart a twist to the gas flow which flows through the intermediate space or gap between the protective sleeve and the gas guide tube in the latter.
- the at least one flow guide element is arranged between a downstream section of the protective sleeve and an upstream section of the gas guide tube.
- the stream mungsleitelement may be in contact with the Gasleitrohr and / or the protective sleeve or even connected.
- the protective sleeve can protrude in the axial direction at least partially into the Gasleitrohr. Side flowing gas can therefore not directly flow the injected fluid.
- the Gasleitrohr may have a portion which widens in the flow direction of the gas stream.
- the gas guide tube has a funnel-shaped inlet region and / or a constriction with a reduced cross-section.
- the funnel-shaped inlet region efficiently "traps" the gas flowing into the gas conduit and the injected fluid.
- the optionally provided constriction produces an advantageous nozzle effect, which increases the efficiency of the device according to the invention.
- the gas guide tube can also have a curved section.
- the Gasleitrohr is arranged coaxially with the mixing chamber and / or protective sleeve.
- the mixing chamber is in particular a tubular section of an exhaust system.
- FIG. 1 shows a first embodiment of the device according to the invention
- FIG. 2 to 5 an embodiment of the protective sleeve a sectional or side view of another embodiment form of the device according to the invention, a sectional view of a further embodiment of the device according to the invention, different views of the protective sleeve with an attached gas guide element shown in Figs. 6 and 6a embodiment of the device according to the invention, further embodiments of the protective sleeve , A further embodiment of the device according to the invention in a sectional view, another embodiment of the protective sleeve and a sectional view or top view of the protective sleeve of FIG. 17 in its installed position.
- Fig. 1 shows a first embodiment 10 of the device according to the invention for introducing a fluid into a gas stream.
- the device is integrated in an exhaust system of a motor vehicle.
- the exhaust gas emitted from its internal combustion engine flows through an exhaust pipe 12 through an inlet port 14 into a mixer pipe 16.
- the mixer pipe 16 in turn communicates with downstream components of the exhaust system, which, however, are not shown.
- a metering device for introducing the reducing agent is secured in the exhaust stream.
- FIG. 1 shows only one dosing tip 20 of the dosing device, which projects into the mixer tube 16.
- the dosing tip 20 is replaced by a Protective sleeve 22 prevented from being directly flowed from the flowing through the inlet port 14 exhaust gas. If the protective sleeve 22 were not present, an injection cone 24 of the reducing agent indicated by dashed lines would be deformed by the exhaust gas flowing into the mixer pipe 16 almost immediately after it leaves the dosing tip 20. In other words, the sprayed-in fluid would be urged against the left side of the mixer tube 16 in FIG. 1, whereby the fluid in the exhaust gas flow would be distributed unevenly and even unwanted deposits of the reducing agent on the inner wall of the mixer tube 16 could occur.
- the protective sleeve 22 comprises an outer wall 26, which is connected to the bottom portion 18 (eg deflection shell) of the mixer tube 16, in particular welded or soldered.
- the outer wall 26 has openings 28 through which a portion of the exhaust gas flowing in the protective sleeve 22 can pass into an intermediate chamber 30, which is delimited by the outer wall 26 and an inner wall 32 which opens in a cone-shaped manner away from the dosing tip 20.
- the inner wall 32 and the outer wall 26 are connected via an end portion 34 in indirect connection with each other.
- a direct connection of the walls 26, 32 is also conceivable.
- the inner wall 32 and the outer wall 26 and - if present - the end portion 34 integrally formed.
- the substantially funnel-shaped inner wall 32 defines an injection space 36 which is open toward the interior of the mixer tube 16 and in which the injection cone 24, which is produced by the dosing tip 20, is protected from direct flow through the exhaust gas.
- injection space 36 which is open toward the interior of the mixer tube 16 and in which the injection cone 24, which is produced by the dosing tip 20, is protected from direct flow through the exhaust gas.
- backwashing has to be sufficiently efficient, on the other hand it is intended to avoid impairment of the deployment of the spray cone 24 as much as possible.
- an annular gap 38 is formed, which is a bottleneck for flowing from the intermediate chamber 30 into the injection space 36 exhaust gas.
- At least a portion of the exhaust gas flowing laterally to the protective sleeve 22 flows through the openings 28 into the intermediate chamber 30.
- a portion of the exhaust gas also flows around the protective sleeve 22 and enters sides of the protective sleeve 22 that are not facing the inlet opening 14 in the intermediate chamber 30 a.
- the intermediate chamber 30 prevail in an operation of the exhaust system substantially homogeneous pressure conditions.
- the exhaust gas passes through the gap 38 into the injection space 36. Due to the homogeneous pressure conditions in the chamber 30, a substantially homogeneous flow in the circumferential direction is also formed through the gap 38.
- the positioning of the gap 38 ensures that the dosing tip 20 is surrounded by exhaust gas, so that no deposits of the reducing agent can form here.
- the protective sleeve 22 acts - functionally speaking - something like a two-stage throttle device.
- the first throttling takes place when the exhaust gas flows through the openings 28 into the intermediate chamber 30.
- the second throttling is achieved by the gap 38. This ensures that in the region around the dosing tip 20 well-defined flow conditions and pressure conditions which reliably prevents the formation of deposits. Since the inner wall 32 is formed without interruption, and the Einsprühkegel 24 is not disturbed by radially incoming gas - except for the area around the gap 38 -.
- the exhaust gas passing through the gap 38 follows the geometry of the inner wall 32 in the injection space 36 and therefore has mainly axial flow components.
- the end of the inner wall 32 facing the metering tip 20 is provided with a curved collar 42 which extends into the intermediate chamber 30.
- FIGS. 2 to 5 show various views of a further embodiment 22a of the protective sleeve (side view, sectional view, plan view and perspective view, respectively).
- the outer wall 26 of the protective sleeve 22a is slightly conically shaped.
- the outer wall 26 is provided with oblong holes 44, which are uniformly distributed in the circumferential direction. At the in the installed position of the metering tip 20 facing the end of the outer wall 26, this is provided with a flange portion 46 to facilitate the attachment of the protective sleeve 22 a to the bottom portion 18 of the mixer tube 16.
- the inner wall 32 of the protective sleeve 22a is funnel-shaped (see in particular FIG. 3) and has a curved shape, which merges dosing tip side into a collar 42 which optimizes the flow through the gap 38.
- the inner wall 32 passes through a curvature in the outer wall 26. It can be clearly seen (compare in particular Fig. 3) that the protective sleeve 22a is a one-piece sheet metal component.
- FIGS. 6 and 6a show a further embodiment 10 'of the device according to the invention.
- the device 10 ' is integrally connected to an inlet port 48 and an outlet port 50, which allow the connection to the other components of the exhaust system.
- the exhaust gas of the protective sleeve which is formed here as a further embodiment 22b, through the inlet opening 14 into a well-defined form, it comprises a gas-conducting element 52.
- the gas-conducting element 52 is also shown in different views in FIGS to 1 1 shown. It essentially comprises a tongue-shaped plate, which is connected at approximately half the height with the outer wall 26 of the protective sleeve 22b.
- the gas guide element 52 protrudes in the installed position through the inlet opening 14 into the inlet nozzle 48.
- An upstream end 54 of the gas guide element 52 is arranged and formed so that it is aligned substantially parallel to the inflowing gas flow. Thus, adverse swirling at the upstream end 54 is avoided.
- the gas guide 52 of the device 10 'flowing gas stream is divided into two streams.
- a first partial flow flows below the gas guide element 52 to the protective sleeve 22b.
- the outer wall 26 of the protective sleeve 22b is provided with circular holes 44 'in the region in which the first partial flow flows, so that this part of the gas flow can reach the intermediate chamber 30.
- the exhaust gas flows through the gap 38 into the injection space 36 and backwashes the metering tip 20 of the metering device (not shown), which is attached via a mounting flange 55 gas-tight to the bottom portion 18.
- the second partial flow flows above the gas guide element 52 to a portion of the protective sleeve 22b, which is formed without interruption.
- this part of the exhaust gas can not get into the intermediate chamber 30, but flows through an annular gap 56 between an arranged in the mixer tube 16 Gasleitrohr 58 and the dosing tip end facing away from the protective sleeve 22b in the tube 58 a. Since the protective sleeve 22b projects into the end of the gas guide tube 58 facing the metering tip 20 in the axial direction, no exhaust gas can flow directly into the gas guide tube 58, but must "force" through the gap 56. This causes the originally obliquely or laterally flowing exhaust gas inside the Gasleitrohrs 58 has a substantially axial direction of flow, which contributes to a further protection of the spray cone 24 and thus supports the uniform distribution of the reducing agent in the exhaust gas stream.
- the part of the second partial flow not flowing in the protective sleeve 22b strikes the outer wall of the end of the gas guide tube 58 facing the protective sleeve 22 " and flows through a bypass gap 60 which is formed by the outer wall of the Gasleitrohrs 58 and the spaced therefrom inner wall of the mixer tube 16. This part of the exhaust gas stream thus does not come into contact with the protective sleeve 22b.
- the protective sleeve 22b and the Gasleitrohr 58 are aligned coaxially with the mixer tube 16.
- FIG. 6a shows a side view of the device 10 ', whereby the fastening flange 55 for the metering device can be clearly seen.
- Fig. 7 shows an embodiment 10 "'of the device according to the invention, which corresponds in most respects to the device 10' of Figs 6 and 6a., However, to optimize the gas flow through the device 10" 'additional flow guide elements 59, 59' are provided.
- the flow guide elements 59 are arranged in the bypass gap 60, more precisely in its input area.
- the flow guide elements 59 which have curved and / or planar surface sections set against the main flow direction in particular, impress a swirl-like flow pattern on the gas flow flowing into the bypass gap 60 in the exemplary embodiment 10 ". This achieves the effect that the gas guide tube 58 is simplified It is understood that the number, arrangement and / or configuration of the flow guide elements 59 can be freely selected in order to produce the flow pattern (with or without swirl component) which is suitable for the respective application.
- the flow guide elements 59 'span the annular gap 56 between the gas guide tube 58 and the end of the protective sleeve 22b facing away from the dosing tip.
- the flow guide elements 59 ' are in the device 10 "' for generating a swirl-shaped flow pattern provided. That is, the exhaust gas flowing through the annular gap 56 into the gas guide tube 58 has a spin-loaded flow pattern. Again, that the number, configuration and / or arrangement of the flow guide 59 'can be adapted to the prevailing conditions in each case to produce the respective desired flow pattern.
- the flow guide 59 extend over the entire annular gap 56. However, they only partially project into the tube 58.
- the flow guide 59 ' are on the one hand to the upstream end portion of the Gasleitrohrs 58 and on the other hand with a downstream portion of the
- the flow guiding elements 59 ' may be firmly connected to the components 58, 22b, but it is also possible for the flow guiding elements 59' to extend only over part of the annular gap 56. The same applies, of course, to the flow guiding elements 59.
- FIG. 8 shows a cross section through the protective sleeve 22b with the gas-conducting element 52.
- Both components 22b, 52 are sheet metal components. It has been joined together, for example by welding or soldering.
- the protective sleeve 22b has a more conically shaped outer wall 26 than the protective sleeve 22a.
- the inner wall 32 of the protective sleeve 22b forms a funnel slightly longer than the inner wall 32 of the protective sleeve 22a.
- the inner wall 32 is also slightly curved.
- the collar 42 of the protective sleeve 22b in contrast to the collar 42 of the protective sleeve 22a has a weaker curvature. This makes it clear that the geometry of the protective sleeve can be widely varied to meet the respective requirements.
- FIG. 12 shows an embodiment 22c of the protective sleeve. However, in addition to the walls 26, 32, it has a base portion 62 which is integrally formed with the wall 26 or made separately therefrom and subsequently connected thereto.
- the base portion 62 has an opening associated with the metering tip 20 to allow the injection of the reducing agent into the injection space 36.
- spacers 64 it is ensured that the base section 62 is arranged at a distance from the bottom section 18 of the mixer tube 16. This creates a backflushing gap 66, through which a flow path 40 "passes. The exhaust gas flowing through the gap 66 contributes to backwashing of the metering tip 20.
- FIG. 13 shows a further embodiment 22d of the protective sleeve which has both a curved inner wall 32 and a curved one At the right part of the outer wall, openings 28 are provided to allow the entry of exhaust gas into the intermediate chamber 30.
- the outer wall 26 On the left side of the protective sleeve 22d, the outer wall 26 has no openings 28 However, it is provided with an outer wall section 68, i he - similar to the gas guide 52 of the protective sleeve 22b - projects through the inlet opening 14 in the inlet port 48.
- the wall of the mixer tube 16 is provided in the region of the protective sleeve 22d with a bead 70, whose configuration varies in the circumferential direction. Depending on the axial position - in particular if the bead 70 is located in the axial direction above the inlet opening 14 - this can also have a constant configuration in the circumferential direction.
- Figs. 14 and 15 show another embodiment 22e of the protective sleeve (only one aperture 28 shown in Fig. 15). It has conical inner and outer walls 32, 26.
- guide elements 72 are arranged, through which the exhaust gas flowing through the gap 38 a swirl component is impressed, as the flow path 40 "" indicates by way of example.
- This measure also leads to a better backwashing of the dosing tip 20 and to a more efficient distribution of the reducing agent in the exhaust gas flow. In addition, this measure allows larger angles on the cone, without a release of the flow is to be feared.
- the protective sleeve 22f differs from the protective sleeve 22b in that guide elements 72 are provided which convey the exhaust gas located in the intermediate chamber 30 to the gap 38 and thereby impart a twist to the exhaust gas.
- the guide elements 72 of the protective sleeve 22 f are bent outwards so that they protrude into the intermediate chamber 30.
- the mounting flange 55 shown in Figs. 6 and 7 has not been shown in Fig. 16 for clarity. However, it is clear that the attachment of the dosing Device can be carried out in the same or similar manner as in the device 10 '.
- the Gasleitrohr 58 ' has a funnel-shaped inlet portion 74, in which the dosing tip 20 facing away End (end portion 34) of the protective sleeve 26f protrudes.
- An opening plane of the funnel-shaped inlet region 74 is not parallel to a plane which is remote from the dosing tip 20 by the protective sleeve 26f.
- the funnel-shaped inlet region 74 is followed by a constriction 76, which develops a nozzle effect, by which the efficiency of the device 10 "is increased.
- the Gasleitrohr 58 ' also extends deeper into the mixer tube 16 as the mixer tube 58. It follows essentially a downstream geometry of the mixer tube 16, which is why it has a curved portion 78.
- a gas-conducting element 52 'of the device 10 is likewise designed somewhat differently than the gas-conducting element 52 of the device 10'. It not only protrudes into the inlet connection 48, but even extends into a tube 80 connected to the inlet connection 48. In this case, the geometry of the tube 80 follows, so that the upstream end 54 of the gas-conducting element 52 'is arranged parallel to the main flow direction of the exhaust gas in the tube 80.
- the gas-conducting element 52, 52' can also be embodied in several pieces, eg inserted into one another or cohesively with one another include related components.
- the gas-conducting element 52 ' also has holes 44 ", which are arranged in a region adjacent to the protective sleeve 22f and allow the passage of exhaust gas in this region Exhaust gas flow into a portion which is fed to a lower portion of the protective sleeve 22f and into a portion which is fed to the upper part of the protective sleeve 22f and the bypass gap 60.
- the Bypass gap 60 a flow mechanics more favorable embodiment of the inlet region as the gap 60 of the device 10 '.
- Fig. 17 shows a protective sleeve 22g
- the flow guide elements forming tabs 82 has.
- the tabs 82 are each associated with a gap opening 84. That Each tab 82 directs the incoming gas to a specific gap opening 84.
- the tabs 82 may be obtained, for example, by making cuts in the outer wall 26 and then bending the tabs 82 out.
- Figures 18 and 19 show the protective sleeve 22g in its installed position. The
- Protective sleeve 22g has - as can be clearly seen in the section of FIG. 18 - a perforation-free inner wall 32, which opens meterierspitzen medical in a protruding into the intermediate chamber 30 collar 42.
- the collar 42 defines, together with the bottom portion 18, the gap 38.
- the bottom portion 18 is disposed slightly lowered relative to inlet ports 48 which open into the mixer tube 16. He is a separate from the tube 16, but gas-tight connected to this component.
- FIG. 18 shows that four connecting pieces 48 connected to exhaust pipes 12 open into the mixer pipe 16. Each nozzle 48, and thus each inlet opening 14, a gap opening 84 is associated in each case. Each gap opening 84 is in turn assigned in each case to a tab 82, by means of which a precisely defined portion of the exhaust gas flowing into the mixer pipe 16 can be conducted into the intermediate chamber 30.
- the throttle sleeve can be actively heated to even faster vaporize reducing agent occurring on it, especially if the exhaust gas flow has not yet led to the heating of the components of the device according to the invention (for example, shortly after starting the engine).
- the surface of the protective sleeve can also be coated catalytically.
- the throat forming gap for establishing fluid communication between the intermediate chamber and the injection space may have a circumferentially varying configuration (e.g., varying gap width). However, it is preferred to form the gap in the circumferential direction as constant as possible in order to enable a circumferentially homogeneous flow of the gas into the injection space.
- the concept according to the invention of firstly allowing an inlet of the exhaust gas into an intermediate chamber through openings in the outer wall of the protective sleeve and then using the exhaust gas for backwashing the dosing tip leads to significantly lower deposits than in previously known concepts.
- concepts Namely, a substantially uniform pressure level is formed in the intermediate chamber, so that the flow through the gap and thus the backwashing of the dosing tip are also comparatively homogeneous.
- the exhaust gas flowing through the gap also flushes the reducing agent out of the injection space. Overall, a more homogeneous distribution of the reducing agent in the exhaust gas flow results.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201680023363.4A CN107532494A (zh) | 2015-04-21 | 2016-03-21 | 用于将流体引入气流的装置 |
| BR112017022441A BR112017022441A2 (pt) | 2015-04-21 | 2016-03-21 | dispositivo para introdução de um fluido em uma corrente de gás |
| US15/568,234 US20180142597A1 (en) | 2015-04-21 | 2016-03-21 | Device for introducing a fluid into a gas stream |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015106078 | 2015-04-21 | ||
| DE102015106078.7 | 2015-04-21 | ||
| DE102015110319.2 | 2015-06-26 | ||
| DE102015110319.2A DE102015110319A1 (de) | 2015-04-21 | 2015-06-26 | Vorrichtung zum Einbringen eines Fluids in einen Gasstrom |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2016169709A1 true WO2016169709A1 (de) | 2016-10-27 |
Family
ID=57110224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2016/056161 Ceased WO2016169709A1 (de) | 2015-04-21 | 2016-03-21 | Vorrichtung zum einbringen eines fluids in einen gasstrom |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20180142597A1 (de) |
| CN (1) | CN107532494A (de) |
| BR (1) | BR112017022441A2 (de) |
| DE (1) | DE102015110319A1 (de) |
| WO (1) | WO2016169709A1 (de) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018149509A1 (en) | 2017-02-20 | 2018-08-23 | Volvo Penta Corporation | A mixer box, a use thereof and a method for mixing |
| EP3492718A1 (de) * | 2017-11-30 | 2019-06-05 | Katcon Global S.A. | Abgasleitung für ein fahrzeug |
| CN111315972A (zh) * | 2017-11-03 | 2020-06-19 | 佛吉亚排放控制技术美国有限公司 | 流动反向混合器组件 |
| FR3111826A1 (fr) * | 2020-06-30 | 2021-12-31 | Faurecia Systemes D'echappement | Dispositif de mélange d’un agent réducteur avec un gaz d’échappement, notamment pour une ligne d’échappement de moteur thermique |
| EP4402353A1 (de) * | 2021-09-16 | 2024-07-24 | Proventia Oy | Strömungsvorrichtung |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10174658B2 (en) | 2016-07-20 | 2019-01-08 | Faurecia Emissions Control Technologies, Usa, Llc | Flow diverter to mitigate deposits in a doser cone |
| DE112016007361T5 (de) * | 2016-10-21 | 2019-07-04 | Faurecia Emissions Control Technologies, Usa, Llc | Reduktionsmittelmischer |
| WO2018156146A1 (en) | 2017-02-24 | 2018-08-30 | Faurecia Emissions Control Technologies, Usa, Llc | Injector spray protector |
| US10907522B2 (en) | 2018-08-03 | 2021-02-02 | Faurecia Systemes D'echappement | Internal box flow deflector for a vehicle exhaust system mixer assembly |
| US10787946B2 (en) | 2018-09-19 | 2020-09-29 | Faurecia Emissions Control Technologies, Usa, Llc | Heated dosing mixer |
| US10794252B1 (en) | 2019-04-18 | 2020-10-06 | Faurecia Emissions Control Technologies, Usa, Llc | Direct spray exhaust mixer system |
| US11624310B2 (en) | 2020-03-30 | 2023-04-11 | Faurecia Emissions Control Technologies, Usa, Llc | Vehicle exhaust system mixer with flexible doser mount |
| US11293328B2 (en) | 2020-06-16 | 2022-04-05 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer baffle with integrated sensor |
| US20220055148A1 (en) * | 2020-08-19 | 2022-02-24 | Transportation Ip Holdings, Llc | Welding window device |
| FI131091B1 (en) | 2021-07-06 | 2024-09-24 | Proventia Oy | Method in a flow device for exhaust gas aftertreatment and flow device |
| CN115898597A (zh) * | 2021-08-26 | 2023-04-04 | 佛吉亚排气控制技术开发(上海)有限公司 | 混合器、混合器组件以及混合方法 |
| CN114570166B (zh) * | 2022-01-21 | 2023-02-10 | 江苏智道工程技术有限公司 | 一种径向进气的脱硫塔气体分布装置 |
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|---|---|---|---|---|
| EP2325452A1 (de) * | 2009-11-19 | 2011-05-25 | MAN Truck & Bus AG | Vorrichtung zur Nachbehandlung von Abgasen von Brennkraftmaschinen |
| WO2012044233A1 (en) * | 2010-09-30 | 2012-04-05 | Scania Cv Ab | Arrangement for introducing a liquid medium into exhaust gases from a combustion engine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8297050B2 (en) * | 2008-07-11 | 2012-10-30 | GM Global Technology Operations LLC | Nozzle diffuser mixer |
| DE102012010878B4 (de) * | 2012-06-01 | 2025-01-23 | Daimler Truck AG | Reduktionsmittelzugabe- und Aufbereitungssystem eines Kraftfahrzeugs |
| WO2015187128A1 (en) * | 2014-06-03 | 2015-12-10 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer and doser cone assembly |
| DE102014009015A1 (de) * | 2014-06-17 | 2015-12-17 | Daimler Ag | Mischvorrichtung eines Abgasreinigungssystems einer Kraftfahrzeug-Brennkraftmaschine |
-
2015
- 2015-06-26 DE DE102015110319.2A patent/DE102015110319A1/de not_active Withdrawn
-
2016
- 2016-03-21 WO PCT/EP2016/056161 patent/WO2016169709A1/de not_active Ceased
- 2016-03-21 BR BR112017022441A patent/BR112017022441A2/pt not_active IP Right Cessation
- 2016-03-21 CN CN201680023363.4A patent/CN107532494A/zh active Pending
- 2016-03-21 US US15/568,234 patent/US20180142597A1/en not_active Abandoned
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2325452A1 (de) * | 2009-11-19 | 2011-05-25 | MAN Truck & Bus AG | Vorrichtung zur Nachbehandlung von Abgasen von Brennkraftmaschinen |
| WO2012044233A1 (en) * | 2010-09-30 | 2012-04-05 | Scania Cv Ab | Arrangement for introducing a liquid medium into exhaust gases from a combustion engine |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018149509A1 (en) | 2017-02-20 | 2018-08-23 | Volvo Penta Corporation | A mixer box, a use thereof and a method for mixing |
| US11047284B2 (en) | 2017-02-20 | 2021-06-29 | Volvo Penta Corporation | Mixer box, a use thereof and a method for mixing |
| CN111315972A (zh) * | 2017-11-03 | 2020-06-19 | 佛吉亚排放控制技术美国有限公司 | 流动反向混合器组件 |
| US11242790B2 (en) | 2017-11-03 | 2022-02-08 | Faurecia Emissions Control Technologies | Flow reversing mixer assembly |
| EP3492718A1 (de) * | 2017-11-30 | 2019-06-05 | Katcon Global S.A. | Abgasleitung für ein fahrzeug |
| US10473018B2 (en) | 2017-11-30 | 2019-11-12 | Katcon Global S.A. | Exhaust line for a vehicle |
| FR3111826A1 (fr) * | 2020-06-30 | 2021-12-31 | Faurecia Systemes D'echappement | Dispositif de mélange d’un agent réducteur avec un gaz d’échappement, notamment pour une ligne d’échappement de moteur thermique |
| EP4402353A1 (de) * | 2021-09-16 | 2024-07-24 | Proventia Oy | Strömungsvorrichtung |
| EP4402353B1 (de) * | 2021-09-16 | 2026-03-04 | Proventia Oy | Strömungsvorrichtung |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102015110319A1 (de) | 2016-10-27 |
| CN107532494A (zh) | 2018-01-02 |
| US20180142597A1 (en) | 2018-05-24 |
| BR112017022441A2 (pt) | 2018-07-17 |
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