EP2464841A1 - Entkopplungselement, insbesondere für abgasanlagen - Google Patents
Entkopplungselement, insbesondere für abgasanlagenInfo
- Publication number
- EP2464841A1 EP2464841A1 EP11749733A EP11749733A EP2464841A1 EP 2464841 A1 EP2464841 A1 EP 2464841A1 EP 11749733 A EP11749733 A EP 11749733A EP 11749733 A EP11749733 A EP 11749733A EP 2464841 A1 EP2464841 A1 EP 2464841A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- bellows
- guiding element
- exhaust gas
- decoupling element
- 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
- 238000002347 injection Methods 0.000 claims abstract description 39
- 239000007924 injection Substances 0.000 claims abstract description 39
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000004202 carbamide Substances 0.000 claims abstract description 37
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000008021 deposition Effects 0.000 abstract description 2
- 238000009736 wetting Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 65
- 239000003054 catalyst Substances 0.000 description 7
- 238000004804 winding Methods 0.000 description 7
- 230000003197 catalytic effect Effects 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000002485 urinary effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- F01N3/24—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
- 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
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- 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
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
- F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
- F01N13/1816—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes
-
- 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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/08—Gas passages being formed between the walls of an outer shell and an inner chamber
-
- 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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
-
- 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
- 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]
Definitions
- the invention relates to a decoupling element, in particular for exhaust systems, for use with an injection device for injecting a reducing agent, such as urea, with a corrugated metal bellows and disposed within the bellows flow-guiding element whose outer diameter is smaller than the inner diameter of the bellows. Furthermore, the invention relates to a method for guiding exhaust gas of an internal combustion engine through a corrugated metal bellows.
- reducing agent e.g. Urea, as known from DE 10 2008 010 071 AI.
- a device for the conversion of exhaust components of an internal combustion engine by means of at least one catalyst and / or a particulate filter is described. It is provided that the at least one catalyst for the conversion of exhaust gas components is arranged within a part of the exhaust tract, which is permanently connected to a compensator.
- Such a compensator or decoupling element usually has a bellows-a screw-shaped or ring-corrugated bellows-and an agraff hose protecting it, which rests against the wall of the bellows.
- the Agraffschlauch serves primarily for protection
- CONFIRMATION COPY the bellows in front of the hot exhaust gas and shows a helical winding, with a substantially S-shaped cross-sectional profile, wherein adjacent elements of the winding intermesh.
- a reducing agent is added to the hot exhaust gas. This is done primarily by an injection device which injects an aqueous urea solution into the hot exhaust gas.
- the metering takes place as a function of operating parameters of the internal combustion engine, controlled by an engine control unit, in such a way that the aqueous urea solution is sprayed into the exhaust gas stream via a nozzle directly in front of a hydrolysis catalytic converter.
- the Agraffschlauch having a diameter which is smaller than or equal to the inner diameter of the bellows, it is almost directly on the inner turns of the bellows on. Between outer turns of the bellows and the Agraffschlauch therefore gaps are formed, which can fill with exhaust gas.
- the windings of the Agraffschlauchs represent a significant flow resistance, but a Agraffschlauch is not gas-tight as such, for different reasons, a gas exchange between Agraffschlauch and bellows takes place.
- small gas flows can arise due to turbulence of the flowing exhaust gas and by diffusion.
- pressure changes in the exhaust system for example by load changes on the engine are possible.
- the movements of the vehicle generate movements of the decoupling element and thus of the bellows, whereby the volume between bellows and Agraffschlauch changes with each compression or stretching of the bellows.
- This allows a negative pressure in the space between bellows and Agraffschlauch arise.
- This causes a volume flow through the Agraffschlauch therethrough.
- urea-enriched exhaust gas passes into the bellows or into the bellows turns, whereby the urea can condense and crystallize out on the cooler bellows wall.
- the object of the invention is therefore to provide an apparatus and a method which prevent the aforementioned disadvantages, in particular, to avoid that a reducing agent, such. Urea can settle in the Balgwandung.
- the object is achieved by a decoupling element of the aforementioned type, which is characterized in that the flow-guiding element the
- the invention provides a method for using the decoupling element of the aforementioned type, wherein flows in an exhaust gas stream flowing exhaust gas divided by a finite radial distance within the bellows arranged flow guiding element into a core stream and a sheath stream.
- an outer agrafl hose is arranged inside the bellows, the outer surface of which is arranged inside the bellows. diameter is less than or equal to the inner diameter of the bellows. It is further particularly preferred vorgese ⁇ hen, that the flow-guiding element is formed as an inner Agraffschlauch and / or a piece of pipe.
- the flow-guiding element is particularly preferably held coaxially within the bellows, it being provided that the flow-guiding element is held on the input and / or output side by at least two supports which are distributed uniformly over the circumference of the flow-guiding element.
- the flow-guiding element is arranged with a finite radial distance within the bellows, where ⁇ results from the fact that between the flow-guiding element and bellows and / or outer Agraffschlauch an annular cross-section space is formed, in which exhaust gas flows in a antelstrom.
- An outer Agraffschlauch can also be provided for guiding the exhaust stream, so that turbulence in the region of the bellows shafts are prevented.
- a urea injection into the core stream takes place by means of an injection device, with particular preference provided that the injection device is arranged on the input side.
- the reducing agent is thus injected into the core stream upstream of the flow-guiding element by an injection device arranged on the input side.
- the injection takes place at a certain angle.
- the invention provides that the injection device is arranged on the input side centrally in front of the inner Agraffschlauch and that the injection ⁇ device by struts on the input side of the inner
- Agraffschlauchs is attached. So that an injection takes place evenly, it is provided that urea by means of the injector is injected cone-shaped in the core stream. It can also be provided according to the invention that the injection device is arranged laterally on an elongated exhaust pipe in front of the flow-guiding element, wherein the injection device is formed at an angle between 45 ° and 90 ° at the exhaust pipe, wherein in a space between flow-guiding element and bellows and / or outer Agraffschlauch urea-free exhaust flows freely in a sheath flow, wherein a wall of the inner Agraffschlauchs penetrating urea is washed away.
- a conical tube insert is inserted into the exhaust pipe at the appropriate angle and connected to a pipe section as a flow-guiding element. As a result, a direct injection of urea is ensured in the core stream.
- the invention further provides that the length of the flow-guiding element is greater than or equal to the length of the bellows, so that the flow-guiding element protrudes over the length of the bellows.
- the length of the flow-guiding element can be varied in such a way that the length of the flow-guiding element is smaller than the length of the bellows, the speed of the exhaust gas being dimensioned such that on the output side both exhaust gas streams are not mixed immediately.
- the decoupling element itself is positively connected by widening and / or by means of clamps with a rigid exhaust pipe, wherein the individual components of the decoupling element are preferably also materially connected by welding with each other.
- a particularly preferred embodiment of the invention provides that urea-enriched exhaust gas flows in a core stream within the flow-guiding element, and that in a space between the flow-guiding element and bellows or outer Agraffschlauch urea-free exhaust flows freely in a bypass flow.
- the flow-conducting element is thus surrounded by urea-free sheath flow and a wall of the flow-guiding element penetrating urea is washed away by the sheath flow.
- the invention provides that the flow-guiding element is connected on the output side to a flange of the bellows, so that a passage between bellows and inner Agraffschlauch is blocked. It can be provided as a flow-guiding element within the bellows only an inner Agraffschlauch, so that an outer Agraffschlauch deleted.
- the flow-guiding element may also have a flange which is connected to the flange of the bellows. The connection provides that the flow-guiding element is on the output side materially connected by means of welding and / or positive fit by means of widening and / or clamps with a flange of the bellows.
- the invention provides that the current-carrying element is connected to a conically widening piece of pipe, which is fastened with its free end on the flange. As a result, a tearing of a possibly used Agraffschlauchs is avoided. On the input side, the intermediate space between the bellows and the flow-guiding element is open towards the exhaust gas flow.
- the invention preferably provides that an overpressure in the sheath flow is generated in the case of such an outlet which is blocked on the output side, whereby a penetration of the urea into the bellows is prevented. It flows urinary ⁇ substance-free sheath flow between flow leading element and bellows. Due to the closed end of a velocity of the exhaust gas stream is greatly reduced, whereby the static pressure increases in the sheath flow. In the core stream in the interior of the flow-guiding element, the flow velocity increases due to the reduced cross section of the flow-guiding element, whereby the static pressure within the core stream decreases. The result is a pressure gradient between the inner and the outer region of the flow-guiding element, whereby a penetration of the urea is prevented to the bellows.
- the decisive advantage of the invention is the separation between urea-free exhaust gas and urea-enriched exhaust gas in the inside.
- the use of the (sheath flow) air gap is provided with only a small gas exchange for the thermal insulation of the exhaust gas flow with chemically identical composition of core and sheath flow.
- a urea injection is not mounted directly in front of the decoupling element, but further forward in the exhaust system is provided, wherein a current split can be carried out in an exhaust pipe in front of the decoupling element, so that core and sheath current are fed to the decoupling element separately.
- Decisive in the decoupling element according to the invention is that two gas streams with different composition are present.
- a suitable feed can be provided according to the invention.
- the additional installation of a turbulator or a mixer for better mixing after the injection at the entrance or within the decoupling element.
- the invention includes dividing the exhaust gas flow of an internal combustion engine into a catalyst through a flow-guiding element within a decoupling element as a flexible conduit element into a core flow through the flow-guiding element and a bypass flow between the flow-guiding element and a bellows of the decoupling element.
- the flow guiding element is formed or held so as not to restrict the mobility of the decoupling element, i. itself is designed as a flexible element, such as a winding tube, or stored as a more or less rigid inner tube with at least one end relatively movable to the bellows.
- the reducing agent is injected ⁇ only in the core flow, so that it is not in the cooler outer region, namely on the inner wall of a directly arranged within the same liner can (also known as winding tube) condense the bellows or the like.
- the two partial streams are recombined downstream of the flow-conducting element and upstream of a catalytic converter. leads, so that the reducing agent in the subsequent catalyst acts on the entire exhaust gas flow.
- This can be done in that the outlets for sheath flow and core flow at the downstream end face of the flow-guiding part are open and the two partial streams can mix in such a way, or in that the flow-conducting element itself is permeable or porous, such as a winding tube, and Therefore, at least one of the two flows can pass through the jacket of the flow-guiding element in the other partial flow.
- the invention further includes a conduit part having a decoupling element designed according to the invention and tubes inflated to both end sides thereof, and an exhaust system with at least one catalytic converter arranged downstream of the decoupling element.
- FIG. 1 shows a longitudinal section of part of an exhaust system ⁇ with a first embodiment of a decoupling element according to the invention.
- FIG. 2 shows a longitudinal section through an embodiment of a decoupling element according to the invention
- Fig. 3 is a longitudinal section through an alternative
- Embodiment of a decoupling element according to the invention shows a longitudinal section through an inventive decoupling element with an alternative injection device.
- FIG. 1 shows a longitudinal section through an inventive decoupling element 1 in the composite of a part of an exhaust system 2.
- the decoupling element 1 is in this case inserted between an input-side exhaust pipe 3 and an exhaust pipe 4 on the output side.
- the latter is followed by a catalytic converter 5 and a further exhaust pipe 6, the catalytic converter 5 being arranged inside a widened exhaust pipe or a suitable housing (not shown).
- catalyst 5 an SCR catalyst may be provided.
- the components are materially bonded, preferably by welding or positively connected by widening and clamps.
- FIG. 2 shows a longitudinal section through a first embodiment of a decoupling element 1 according to the invention.
- the Entkopp ⁇ ment element 1 comprises a ring-corrugated bellows 7, which is positively connected to the rigid exhaust pipe 3 of the exhaust system 2, as by widening and clamps, or cohesively by welding.
- an outer Agraffschlauch 8 is arranged, which protects the bellows from the hot exhaust gas stream.
- a flow-guiding element 9 is arranged coaxially within the outer Agraffschlauchs 8.
- an inner Agraffschlauch is preferably provided as the flow-guiding element 9.
- the inner Agraffschlauch 9 is spirally wound or has a plurality of ring segments, which has a wall 10 form.
- Such a flow-guiding element may be formed from partially gas-permeable tubular shaped materials or other metallic elements for current conduction.
- the inner Agraffschlauch 9 is supported by means of supports 11 centrally within the outer Agraffschlauchs 8 and held in this position. There are at least two, preferably four evenly distributed over the circumference supports 11 provided on the input and output sides. The supports 11 do not impede a flowing exhaust gas stream 12 (characterized by an arrow pointing to the left in the image). The flow direction of the exhaust gas is given by the arrow direction.
- An outer diameter Dl of the inner Agraffschlauchs 9 is smaller than an inner diameter D2 of the bellows 7.
- the outer Agraffschlauch 8 has an outer diameter corresponding to the inner diameter D2 of the bellows 7.
- a gap 13 is formed with a finite radial distance d, in which a part of the exhaust gas can flow.
- the outer Agraffschlauch 8 has an outer diameter which is equal to or smaller than the inner diameter D2 of the bellows 7, so that the outer
- Agraffschlauch 8 rests against the inside of the flange of the bellows 7.
- the width of the intermediate space 13, that is, the distance d between inner Agraffschlauch 9 and bellows 7 corresponds to the distance between inner Agraffschlauch 9 and outer Agraffschlauch 8 minus the wall thickness of the outer Agraffschlauchs 8.
- the wall thickness of the outer Agraffschlauchs 8 with respect to the width of the gap 13 is not relevant.
- Agraffschlauchs 9 to the bellows 7 can also be much narrower be formed, as long as a flow through an exhaust gas through the gap 13 is ensured. If the gap 13 is very narrow, ie. formed in the size range of the wall thickness of the Agraffschlauche, an outer Agraffschlauch 8 can be omitted.
- an injection device 14 for injecting urea into the exhaust gas flow is provided centrally in front of the inner injection hose 9.
- Urea is sprayed cone-shaped into an exhaust gas flow (characterized by an injection cone 15) and thus evenly distributed in the inner Agraffschlauch 9
- the inner Agraffschlauch 9 is formed longer than the surrounding him bellows 7 and thus protrudes on the input side as well as on the output side beyond the bellows 7 in the adjacent exhaust gas pipes 3, 4 into it. It is also possible the inner
- Agraffschlauch 9 as a flow-guiding element shorter than the bellows 7 form.
- Agraffschlauchs 9 is so washed around by urea-free exhaust, thereby possibly the wall 10 of the inner
- Agraffschlauchs 9 penetrating urea is washed away by the exhaust gas flowing in the bypass flow 17.
- Urinary Substance injection itself is centrally in the core stream 16 within the inner Agraffschlauchs 9 conical, so that a uniform injection is given.
- the outer Agraffschlauch 8 serves primarily the protection of the bellows 7 before the hot exhaust gas within the bypass flow 17 and the same leadership.
- a combination of the exhaust gas flows takes place in a rigid part of the exhaust system behind the decoupling element 1. This is shown in Fig. 1.
- the urea-rich core stream 16 is highlighted by a black and white puncture. Due to the uniform flow of the exhaust gases in the core and sheath flow turbulence of the exhaust gases on the output side of the decoupling element is avoided.
- the bellows 7 thus comes in no way in contact with urea-enriched exhaust gas.
- FIG. 3 an alternative embodiment of the decoupling element 1 according to the invention is shown, wherein within the bellows 7, only an inner Agraffschlauch 9 is provided. An external Agraffschlauch 8 can also be omitted.
- On the output side of the decoupling element 1 of the Agraffschlauch 9 is connected to the bellows 7 gas-tight at its flange 18 preferably by welding and / or positive locking by clamps, wherein the diameter Dl of the inner Agraffschlauchs 9 widens conically in the output area conical to the diameter D2 of the bellows 7. On the output side is thus a passage for the exhaust gas locked.
- the intermediate space 13 between the bellows and the inner agrafling hose 9 is open toward the exhaust gas stream 12. Due to the closed end of the intermediate space 13, the velocity of the exhaust gas within the bypass flow 17 is greatly reduced, whereby the static pressure in the intermediate space 13 increases.
- Inside the inner Agraffschlauchs 9 takes the flow rate of the exhaust gas in the core stream 16 due to the reduced cross-section, whereby the static pressure within the core stream 13 decreases.
- a flow gradient arises between the two exhaust gas flows, as a result of which urea-free exhaust gas flows out of the sheath flow 17 through the agravating hose 9 to the core flow 16. This is illustrated in Fig. 3 by the arrows 19 (outflow Mantelström), the path of the exhaust gas from the sheath flow 17 through the wall of the inner
- Agraffschlauchs 9 show. A penetration of the urea to the bellows 7 is thus also prevented.
- a flow resistance 20 is arranged.
- the flow resistance 20 in Fig. 3 shows a quarter-circle-shaped cross-section, wherein the rounded side is opposite to the exhaust gas stream 12.
- the flow resistance 20 can have an annular configuration or can also be present in a plurality of section-shaped pieces.
- the flowing exhaust gas strikes the flow resistors 20 and is compacted into the inner injection hose 9. The speed of the flowing exhaust gas is thereby increased again. If in the embodiments of FIGS.
- Fig. 4 shows a longitudinal section through an alternative embodiment of the injection device 14. The same parts are identified by the same reference numerals.
- an elongated exhaust pipe 22 is disposed on the input side flange 21.
- a pipe section 23 is arranged by means of supports 11 as a flow-guiding element. The parts are dimensioned such that they can be inserted into the input-side end of the decoupling element.
- connection is the exhaust pipe 22 to the flange 21 and the pipe piece 23 preferably welded to the input-side end of the inner Agraffschlauchs 9.
- the exhaust gas stream 12 can be separated by means of the pipe piece 23 again into a flow 17 and core stream 16.
- the injection device 14 is here formed laterally outside of the exhaust pipe 22 and is arranged at an angle of 45 ° - 90 ° to the central axis of the ⁇ device, whereby the reducing agent is injected at an angle 45 ° to 90 °.
- the separation between pure exhaust gas and enriched with reducing agent or chemically modified exhaust gas is particularly advantageous.
- this decoupling element 1 it is possible, by dividing the exhaust gas stream into a core stream 16 with injected urea and a urea substance-free sheath flow 17 to keep the additive added to the exhaust gas from the bellows and thus avoid deposition of the same entirely.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Silencers (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010035311 DE102010035311A1 (de) | 2010-08-25 | 2010-08-25 | Entkopplungselement, insbesondere für Abgasanlagen |
PCT/EP2011/004219 WO2012025218A1 (de) | 2010-08-25 | 2011-08-23 | Entkopplungselement, insbesondere für abgasanlagen |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2464841A1 true EP2464841A1 (de) | 2012-06-20 |
EP2464841B1 EP2464841B1 (de) | 2013-12-11 |
EP2464841B8 EP2464841B8 (de) | 2014-02-19 |
Family
ID=44534255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20110749733 Active EP2464841B8 (de) | 2010-08-25 | 2011-08-23 | Entkopplungselement, insbesondere für abgasanlagen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2464841B8 (de) |
DE (1) | DE102010035311A1 (de) |
WO (1) | WO2012025218A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012014333A1 (de) * | 2012-07-20 | 2014-01-23 | Man Truck & Bus Ag | Mischvorrichtung zur Nachbehandlung von Abgasen |
DE102013111033B4 (de) | 2012-10-08 | 2019-10-17 | Witzenmann Gmbh | Verfahren und Vorrichtung für Thermomanagement einer Kfz-Abgasanlage |
DE102012024118A1 (de) | 2012-12-11 | 2014-06-26 | Man Diesel & Turbo Se | Kompensator eines Abgasnachbehandlungssystems |
GB2528764B (en) * | 2014-06-13 | 2020-07-29 | Cummins Emission Solutions Inc | In-line decomposition reactor pipe with exhaust assist |
DE102014015868A1 (de) * | 2014-10-25 | 2016-04-28 | Daimler Ag | Abgasnachbehandlungseinrichtung für eine Verbrennungskraftmaschine, insbesondere eines Kraftwagens |
DE102016119306A1 (de) * | 2016-10-11 | 2018-04-12 | Witzenmann Gmbh | Vorrichtung zum Vermischen von Fluidströmen |
SE541082C2 (en) | 2017-06-14 | 2019-04-02 | Scania Cv Ab | Exhaust additive distribution arrangement and system |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH11182234A (ja) * | 1997-12-17 | 1999-07-06 | Sango Co Ltd | 排気管 |
EP1398469B1 (de) * | 2002-09-12 | 2005-04-20 | Ford Global Technologies, LLC | Balganordnung zur Verbindung wenigstens zweier Abgasauslassrohre einer Fahrzeugbrennkraftmaschine mit Abgasrohren und eine Brennkraftmaschine ausgestattet mit einer solchen Anordnung |
DE102004020138B4 (de) * | 2004-04-24 | 2007-02-08 | Daimlerchrysler Ag | Reduktionsmittelzugabesystem |
SE528119C2 (sv) * | 2004-08-06 | 2006-09-05 | Scania Cv Ab | Arrangemang för att tillföra ett medium till en avgasledning hos en förbränningsmotor |
US7941995B2 (en) * | 2007-10-02 | 2011-05-17 | Cummins Filtration Ip, Inc. | Exhaust aftertreatment system with compliantly coupled sections |
DE102008010071A1 (de) | 2008-02-19 | 2009-08-20 | Man Nutzfahrzeuge Ag | Kompaktes Abgasnachbehandlungssystem |
DE102009043577B4 (de) * | 2008-10-01 | 2014-01-23 | Witzenmann Gmbh | Entkoppelelement mit einem Filterelement |
DE202010006126U1 (de) * | 2010-04-28 | 2010-08-12 | Witzenmann Gmbh | Entkoppelelement für Abgasanlagen |
DE202010006231U1 (de) * | 2010-04-29 | 2010-08-05 | Boa Balg- Und Kompensatoren-Technologie Gmbh | Flexibles Leitungselement |
DE102010025611A1 (de) * | 2010-06-30 | 2011-01-13 | Daimler Ag | Abgasstrang für ein Kraftfahrzeug |
-
2010
- 2010-08-25 DE DE201010035311 patent/DE102010035311A1/de not_active Withdrawn
-
2011
- 2011-08-23 EP EP20110749733 patent/EP2464841B8/de active Active
- 2011-08-23 WO PCT/EP2011/004219 patent/WO2012025218A1/de active Application Filing
Non-Patent Citations (1)
Title |
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See references of WO2012025218A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2012025218A1 (de) | 2012-03-01 |
EP2464841B8 (de) | 2014-02-19 |
DE102010035311A1 (de) | 2012-03-01 |
EP2464841B1 (de) | 2013-12-11 |
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