CN111997717A - Injection module for a reducing agent - Google Patents
Injection module for a reducing agent Download PDFInfo
- Publication number
- CN111997717A CN111997717A CN202010459630.0A CN202010459630A CN111997717A CN 111997717 A CN111997717 A CN 111997717A CN 202010459630 A CN202010459630 A CN 202010459630A CN 111997717 A CN111997717 A CN 111997717A
- Authority
- CN
- China
- Prior art keywords
- injection
- spray
- reducing agent
- openings
- injection openings
- 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.)
- Pending
Links
- 238000002347 injection Methods 0.000 title claims abstract description 73
- 239000007924 injection Substances 0.000 title claims abstract description 73
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 51
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims description 53
- 230000007423 decrease Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 230000035515 penetration Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
-
- 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]
-
- 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
-
- 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
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
The invention relates to an injection module (1) for injecting a reducing agent into an exhaust system (2) of an internal combustion engine, wherein the injection module (1) has an injection plate (5) having two injection openings (7) for the metered release of the reducing agent. The injection openings (7) are oriented in such a way that the reducing agent jets (9) injected through the injection openings (7) partially overlap. The two injection openings (7) are designed as bores in the injection plate (5) and each have a longitudinal axis (8,8 '), wherein the longitudinal axes (8, 8') of the injection openings (7) do not intersect.
Description
Technical Field
The invention relates to an injection module, such as is preferably used for introducing a reducing agent into an exhaust system of a motor vehicle or an internal combustion engine.
Background
When fuel is combusted in an internal combustion engine, nitrogen oxides are always formed, which are removed in the exhaust gas flow. In order to reduce these nitrogen oxides, a liquid reducing agent, for example an aqueous urea solution, is injected into the exhaust pipe of the passenger or load vehicle by means of a dosing unit. Subsequently, the reducing agent reacts with the nitrogen oxides in an SCR catalyst (selective catalytic reduction) and reduces the nitrogen oxides to nitrogen gas and water. For reliable functioning, good mixing of the reducing agent with the exhaust gas is indispensable, by: the reducing agent is introduced into the exhaust system in the form of a corresponding spray. These sprays must match the geometry of the exhaust system in shape and depth. To achieve this, different atomizing mechanisms are known, wherein a distinction is made between turbulent atomizers and swirl atomizers. In general, small droplet sizes are sought here in order to ensure good mixing of the exhaust gas with the reducing agent. However, applications requiring larger droplets may also be obtained, since these droplets can penetrate deeper into the exhaust gas flow without decelerating rapidly and being deflected by the flow. However, such a reducing agent jet has the following disadvantages: the released spray cone has only a narrow angle and cannot be released in a wide uniform angle. Similar problems are also known when metering fuel or water into the combustion chamber or into the exhaust system of an internal combustion engine.
DE 102014210638 a1 discloses an injection module and an exhaust system having an injection module, which has an injection plate with two injection openings for a reducing agent. The holes are oriented in such a way that the reducing agent jets intersect outside the module, so that a turbulent flow is generated, which leads to a broad, space-filling spray. However, larger droplets with large penetration depths cannot be produced, making the jet valve less than optimally suited for such applications.
Disclosure of Invention
The object of the invention is therefore to produce a spray with relatively large droplets which spread over a large angle in space, wherein the spray cone should simultaneously have a uniform mass distribution.
The spray module according to the invention has the following advantages: by means of the arrangement of the injection openings, a uniform production of the reducing agent can be achieved when injecting into the exhaust system, wherein at the same time a larger droplet size and a greater penetration depth are achieved. For this purpose, the injection module has an injection disk with two injection openings for the metered release of the reducing agent, wherein the injection openings are oriented in such a way that the reducing agent jets emerging through the injection openings partially overlap. For this purpose, the two injection openings are embodied as bores in the injection disk, wherein the bores each have a longitudinal axis and the longitudinal axes of the injection openings do not intersect.
The reducing agent jets which are sprayed through the spray openings overlap only partially due to the arrangement of the longitudinal axes, so that only a part of the respective reducing agent jets influence one another and thus form a turbulent flow. This results in a turbulent flow, and thus a good swirling of the reducing agent with correspondingly small droplets, mainly close to the longitudinal axis of the injection module, whereas larger droplets are present in the edge region, which have a large penetration depth into the exhaust system. At the same time, it is thereby achieved that the reducing agent jet remains relatively sharply delimited, so that the reducing agent is introduced into a desired spatial region of the exhaust system and cannot be separated uncontrolled, for example on a wall of the exhaust system.
In a first advantageous configuration, the injection openings at least partially overlap within the injection disk. The desired effect can thus be set very precisely by the precise orientation of the injection openings in their position relative to one another, wherein the precise properties can be set by the shape and size of the intersection region.
In a further advantageous embodiment, the injection opening is configured as a cylindrical bore with a circular cross section perpendicular to the longitudinal axis. In a further advantageous embodiment, the injection opening has an oval or rectangular cross section perpendicular to its longitudinal axis. This configuration of the injection openings makes it possible to specifically influence the shape of the reducing agent jet, for example by means of a rectangular cross section, whereas injection openings with a circular cross section can be produced cost-effectively and quickly.
In a further advantageous embodiment, the cross section of the injection openings decreases perpendicular to their longitudinal axis in the flow direction of the reducing agent. This makes it possible to achieve a flow acceleration in the injection opening and thus a higher injection speed of the reducing agent from the injection opening, which leads to stronger turbulence or to a further penetration of the reducing agent into the exhaust system.
In a further advantageous embodiment, more than two injection openings are formed in the injection plate, wherein the injection openings are preferably arranged in pairs such that the reducing agent jets of the respective injection opening pairs partially overlap each other. By forming a plurality of injection openings or injection opening pairs, the reducing agent can be introduced into a very large spatial region of the exhaust system in order to achieve an optimum action there.
The minimum distance of the central axes of the injection openings, which overlap with one another or the central axes of the injection jets, is preferably 0.25 to 0.75 times the diameter of the injection openings at their outlet. Thus, the desired partial swirl is achieved, but complete penetration of the jet jets into one another is not achieved.
Drawings
In the drawings, different embodiments of the jetting module according to the invention are shown. The figures show:
fig. 1 is a schematic illustration of a longitudinal section of a spray module, which as is known from the prior art,
fig. 2a and 2b are schematic representations of different spray shapes, such as spray shapes formed by different spray orifices,
figure 3a is a cross-section of a jet disc according to the invention with corresponding jet holes,
figure 3b is a top view of the side of the injector plate of figure 3a from which reducing agent is sprayed,
FIG. 4a is a cross-section of another spray disk according to the invention, and
figure 4b corresponds to the top view of the spray disk of figure 3b,
FIG. 5 is a perspective view of a spray disk 5 according to the invention, the arrangement of the spray openings corresponding to the greatest extent to FIG. 3a, and
fig. 6 is a top view of the same spray disk of fig. 5 as viewed from the inflow-side end of the spray hole.
Detailed Description
Fig. 1 shows an injection module, as it is used for introducing a reducing agent into an exhaust system of an internal combustion engine. The injection module 1 has a housing 3 which is inserted into an opening 4 in the wall of the exhaust system 2. The housing 3 has a reducing agent chamber 12, in which the reducing agent is held at the injection pressure. Furthermore, a valve element 11, which is designed here as a ball and interacts with a valve seat 14 for opening and closing a flow cross section, is arranged in the reducing agent chamber 12 so as to be longitudinally displaceable. The housing 3 is bounded at its end facing the exhaust system 2 by an injection plate 5. The spray disk 5 is designed as a circular or rectangular plate and has two spray openings 7, which are formed in the spray disk 5 opposite one another with respect to the longitudinal axis 6 of the spray module 1. If the valve element 11 is moved away from the valve seat 14 by a mechanism, for example an electromagnet, the reducing agent flows through the reducing agent chamber 12 between the valve element 11 and the valve seat 14, and thus into the injection openings 7 and finally into the exhaust system 2, where the reducing agent forms a reducing agent jet 9, the individual droplets of which are illustrated schematically and exaggeratedly in fig. 1, when it is sprayed out of the injection openings 7. Depending on the shape of the injection openings 7, different reducing agent jet shapes are obtained, as shown in fig. 2a and 2 b. If there is a largely laminar flow in the injection orifice 7, a narrow spray cone is produced, which, as shown in fig. 2a, has a greater penetration depth into the exhaust system. If turbulent flow occurs in the injection openings 7, the reducing agent jet 9 opens up in advance and forms a fine spray and thus a wide spray cone, as shown in fig. 2 b. Both shapes can be desirable as required, but with a large penetration depth, the introduction of the reducing agent into a large spatial region can therefore only be achieved with difficulty.
Fig. 3a shows a first exemplary embodiment of a spray disk 5 of a spray module 1 according to the invention in cross section. Two injection openings 7 are formed in the injection disk 5, each of which is in the form of a cylindrical bore having a longitudinal axis 8. The spray openings 7 partially intersect in the spray disk 5 and form a superposition area 16 there. The longitudinal axes 8 in fig. 3a intersect only in projection, but are actually oriented in such a way that they do not intersect. This is clearly visible from the view of fig. 3b, which shows a top view of the spray disk 5 from the ejection-side end of the spray orifices 7. The two longitudinal axes 8 are oriented mathematically obliquely to one another, so that the reducing agent jets only partially overlap. Due to the partial overlap, strong turbulence occurs in this region and thus the already described formation of the spray with small droplets, which are distributed over a large spatial region, while the portion of the reducing agent jet in the edge region with larger droplets has a large penetration depth into the exhaust system, wherein a more sharply delimited reducing agent jet is achieved.
Fig. 4a shows a further exemplary embodiment of a spray disk 5 according to the invention, in which the spray openings 7 decrease in cross section in the flow direction. As a result, the flow of the reducing agent is accelerated in the injection openings 7, which in turn leads to stronger turbulence or to a greater penetration depth into the exhaust system. For this purpose, fig. 4b shows a top view of an alternative spray disk 5, in which the spray openings 7' additionally have a rectangular cross-sectional shape. This allows a further shaping of the reducing agent jet in order to achieve an optimum distribution of the reducing agent in the exhaust system. Here too, the reducing agent jet and the injection openings 7' partially overlap.
Fig. 5 shows a perspective view of the spray disk 5 already shown in fig. 3a, which has spray openings 7 and its longitudinal axis 8. Accordingly, fig. 6 shows the injection openings 7 and their orientation of the longitudinal axis 8 in a plan view of the injection disk 5 shown in fig. 5, which visually illustrates the oblique arrangement of the longitudinal axes 8 relative to one another.
Claims (8)
1. An injection module (1) for injecting a reducing agent into an exhaust system (2) of an internal combustion engine, wherein the injection module (1) has an injection plate (5) with two injection openings (7) for metered release of the reducing agent, and the injection openings (7) are oriented in such a way that reducing agent jets (9) injected through the injection openings (7) partially overlap,
it is characterized in that the preparation method is characterized in that,
the two injection openings (7) are designed as bores in the injection plate (5), each having a longitudinal axis (8,8 '), wherein the longitudinal axes (8, 8') of the injection openings (7) do not intersect.
2. Spray module according to claim 1, characterized in that the spray holes (7) partly overlap in the spray disc (5).
3. The spray module according to claim 1 or 2, characterized in that the spray holes (7) are configured as cylindrical bores with a circular cross section perpendicular to the longitudinal axis (8, 8').
4. The spray module according to claim 1 or 2, characterized in that the spray orifice (7) has an oval or rectangular cross section perpendicular to its longitudinal axis (8, 8').
5. The spray module according to claim 1, 3 or 4, characterized in that the cross section of the spray orifice (7) decreases perpendicular to its longitudinal axis (8, 8') in the flow direction.
6. The spray module according to one of claims 1 to 5, characterized in that more than two spray orifices (7) are configured in the spray disk (5).
7. The injection module as claimed in claim 6, characterized in that the injection openings (7) are arranged in pairs such that the reducing agent jets (9) of the respective injection opening pairs partially overlap each other.
8. The spray module of any one of claims 1 to 7 wherein the minimum spacing of the central axes of the partially overlapping spray holes is 0.25 to 0.75 times the diameter of the spray holes at their outlets.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019207697.1A DE102019207697A1 (en) | 2019-05-27 | 2019-05-27 | Injection module for a reducing agent |
| DE102019207697.1 | 2019-05-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111997717A true CN111997717A (en) | 2020-11-27 |
Family
ID=73264372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010459630.0A Pending CN111997717A (en) | 2019-05-27 | 2020-05-27 | Injection module for a reducing agent |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111997717A (en) |
| DE (1) | DE102019207697A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4706631B2 (en) * | 2006-12-20 | 2011-06-22 | 株式会社デンソー | Exhaust purification device |
| JP4992801B2 (en) * | 2008-04-09 | 2012-08-08 | 株式会社デンソー | Urea water injection valve |
| DE102009034072A1 (en) * | 2009-07-22 | 2011-01-27 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Injector for the supply of reducing agent and apparatus for the treatment of exhaust gases |
-
2019
- 2019-05-27 DE DE102019207697.1A patent/DE102019207697A1/en active Pending
-
2020
- 2020-05-27 CN CN202010459630.0A patent/CN111997717A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019207697A1 (en) | 2020-12-03 |
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