DE102013211245A1 - mixing element - Google Patents
mixing element Download PDFInfo
- Publication number
- DE102013211245A1 DE102013211245A1 DE102013211245.9A DE102013211245A DE102013211245A1 DE 102013211245 A1 DE102013211245 A1 DE 102013211245A1 DE 102013211245 A DE102013211245 A DE 102013211245A DE 102013211245 A1 DE102013211245 A1 DE 102013211245A1
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- DE
- Germany
- Prior art keywords
- gas
- mixing
- mixing element
- exhaust
- train
- 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.)
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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
- F01N3/24—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
- B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
- B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
- B01F25/25—Mixing by jets impinging against collision plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
- B01F25/43163—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod in the form of small flat plate-like elements
-
- 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
- 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
-
- 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
Abstract
Ein Mischelement (8) zum Vermischen wenigstens eines durch einen Gasstrang strömenden Gases (6) mit einem Fluid (16), insbesondere eines durch einen Abgasstrang (2) strömenden Abgases (6) mit einem fluiden Reduktionsmittel (16), weist wenigstens eine kammartige und/oder rillenförmige Struktur auf.A mixing element (8) for mixing at least one gas (6) flowing through a gas line with a fluid (16), in particular an exhaust gas (6) flowing through an exhaust line (2) with a fluid reducing agent (16), has at least one comb-like and / or groove-shaped structure.
Description
Die Erfindung betrifft ein Gas/Fluid-Mischelement, das ausgebildet ist, um das Vermischen wenigstens eines strömenden Gases mit wenigstens einem Fluid, das in das strömenden Gas eingespritzt wird, zu unterstützen.The invention relates to a gas / fluid mixing element configured to assist in mixing at least one flowing gas with at least one fluid injected into the flowing gas.
Stand der TechnikState of the art
Zur Reduktion von Stickoxiden in den Abgasen von Verbrennungsmotoren, insbesondere Dieselmotoren, wird häufig ein flüssiges, harnstoffhaltiges Reduktionsmittel in die durch einen Abgasstrang strömenden Abgase eingespritzt.For the reduction of nitrogen oxides in the exhaust gases of internal combustion engines, especially diesel engines, a liquid, urea-containing reducing agent is often injected into the exhaust gases flowing through an exhaust line.
Um eine optimale Vermischung des eingespritzten Reduktionsmittels mit den durch den Abgasstrang strömenden Abgasen zu erreichen, können Mischvorrichtungen vorgesehen sein, die innerhalb des Abgasstranges angeordnet sind. Solche Mischvorrichtungen sind z.B. in
Neben der Durchmischung des Abgases mit Reduktionsmittel können die Mischvorrichtungen auch zur Wärmeübertragung von den Abgasen auf das Reduktionsmittel beitragen, um das Verdampfen des Reduktionsmittles zu unterstützen.In addition to the mixing of the exhaust gas with reducing agent, the mixing devices can also contribute to the heat transfer from the exhaust gases to the reducing agent in order to promote the evaporation of the Reduktionsmittles.
Beim Einsatz derartiger Mischvorrichtungen hat sich gezeigt, dass die Gefahr besteht, dass ein Teil des in den Abgasstrang eingespritzten flüssigen Reduktionsmittels an der Mischvorrichtung haften bleibt und Ablagerungen auf der Mischvorrichtung und/oder der Begrenzung des Abgasstranges bildet, so dass dieser Teil des Reduktionsmittels nicht für die Schadstoffreduktion zur Verfügung steht. Die Ablagerungen können auch aushärten und die Strömungseigenschaften der Abgase im Abgasstrang negativ beeinflussen, so dass sie einen erhöhten Kraftstoffverbrauch und/oder einen erhöhten Schadstoffausstoß zur Folge haben.When using such mixing devices has been shown that there is a risk that a portion of the injected into the exhaust line liquid reducing agent adheres to the mixing device and forms deposits on the mixing device and / or the boundary of the exhaust line, so that this part of the reducing agent not for the pollutant reduction is available. The deposits may also harden and adversely affect the flow characteristics of the exhaust gases in the exhaust line, resulting in increased fuel consumption and / or increased pollutant emissions.
Offenbarung der ErfindungDisclosure of the invention
Es ist daher eine Aufgabe der Erfindung, Mischelemente, wie sie zum Vermischen eines Fluids mit wenigstens einem strömenden Gas verwendet werden, dahingehend zu verbessern, dass ein dauerhaftes Anhaften des Fluids an den Mischelementen verhindert oder zumindest deutlich reduziert wird.It is therefore an object of the invention to improve mixing elements, as used for mixing a fluid with at least one flowing gas, to the extent that a permanent adhesion of the fluid to the mixing elements is prevented or at least significantly reduced.
Diese Aufgabe wird durch ein erfindungsgemäßes Mischelement nach dem unabhängigen Patentanspruch 1 gelöst.This object is achieved by an inventive mixing element according to independent claim 1.
Die abhängigen Patentansprüche beschreiben eine Gas/Fluid-Mischvorrichtung, die wenigstens ein erfindungsgemäßes Mischelement umfasst, und einen Gasstrang, in dem wenigstens ein erfindungsgemäßes Mischelement bzw. eine erfindungsgemäße Gas/Fluid-Mischvorrichtung installiert ist.The dependent claims describe a gas / fluid mixing device which comprises at least one mixing element according to the invention, and a gas train in which at least one mixing element according to the invention or a gas / fluid mixing device according to the invention is installed.
Ein erfindungsgemäßes Mischelement zum Vermischen wenigstens eines durch einen Gasstrang strömenden Gases mit einem Fluid, insbesondere eines durch einen Abgasstrang strömenden Abgases mit einem in den Abgasstrang eingespritzten fluiden Reduktionsmittel, weist wenigstens eine Oberfläche mit einer kamm- und/oder rillenförmig ausgebildeten Struktur auf.A mixing element according to the invention for mixing at least one gas flowing through a gas train with a fluid, in particular an exhaust gas flowing through an exhaust line with a fluid reducing agent injected into the exhaust line, has at least one surface with a comb-shaped and / or groove-shaped structure.
Eine rillenförmige Struktur des Mischelements ermöglicht es, dass sich Teile des Fluids, die sich auf dem Mischelement niedergeschlagen haben, in den Rillen der rillenförmigen Struktur sammeln und Tropfen bilden, die durch die Abgasströmung, die auf das Mischelement trifft und an dem Mischelement entlang strömt, auf die von der Abgasströmung abgewandte (Lee-)Seite des Mischelements gedrückt werden. A groove-like structure of the mixing element allows portions of the fluid deposited on the mixing element to collect in the grooves of the groove-shaped structure and to form droplets that flow through the flow of exhaust gas impinging on the mixing element and flowing along the mixing element. be pressed on the side facing away from the exhaust flow (lee-) side of the mixing element.
Dort können sich die Tropfen, wenn sie eine gewisse Größe erreicht haben, von dem Mischelement lösen, werden von der Abgasströmung stromabwärts des Mischelements mitgerissen und lösen sich im weiteren Strömungsverlauf in der Abgasströmung auf. Das Ablösen der Tropfen auf der von der Abgasströmung abgewandten (Lee-)Seite des Mischelements kann zusätzlich dadurch unterstützt werden, das auf der Oberfläche der von der Abgasströmung abgewandten Seite eine kammartige Struktur ausgebildet ist.There, the drops, when they have reached a certain size, solve the mixing element, are entrained by the exhaust gas flow downstream of the mixing element and dissolve in the further flow in the exhaust gas flow. The detachment of the drops on the side facing away from the exhaust gas flow (lee-) side of the mixing element can be additionally supported by the fact that a comb-like structure is formed on the surface of the side facing away from the exhaust gas flow side.
Durch ein erfindungsgemäßes Mischelement wird das Ausbilden von Fluidablagerungen auf dem Mischelement und/oder an der Wand des Abgasstranges, insbesondere im Bereich stromabwärts des Mischelements, verhindert oder zumindest erheblich reduziert.By means of a mixing element according to the invention, the formation of fluid deposits on the mixing element and / or on the wall of the exhaust line, in particular in the area downstream of the mixing element, is prevented or at least considerably reduced.
Die Erfindung umfasst auch eine Gas/Fluid-Mischvorrichtung, die zur Anordnung in einem Gasstrang vorgesehen ist und ein oder mehrere erfindungsgemäße Mischelemente umfasst. Eine Gas/Fluid-Mischvorrichtung mit mehreren Mischelementen ermöglicht eine besonders effektive Vermischung des eingespritzten Fluids mit dem durch den Gasstrang strömenden Gas. Dadurch, dass in einer derartigen Gas/Fluid-Mischvorrichtung erfindungsgemäß ausgebildete Mischelemente verwendet werden, können Fluid-Ablagerungen auf und/oder stromabwärts der Mischvorrichtung erfolgreich verhindert bzw. minimiert werden.The invention also includes a gas / fluid mixing device, which is intended to be arranged in a gas train and comprises one or more mixing elements according to the invention. A gas / fluid mixing device with a plurality of mixing elements allows a particularly effective mixing of the injected fluid with the gas flowing through the gas train. By virtue of the fact that mixing elements designed according to the invention are used in such a gas / fluid mixing device, fluid deposits on and / or downstream of the mixing device can be successfully prevented or minimized.
Ein erfindungsgemäßes Mischelement kann so im Gasstrang angeordnet sein, dass es sich orthogonal oder nicht-orthogonal zur Richtung der Gasströmung im Gasstrang erstreckt. Insbesondere kann eine erfindungsgemäße Gas/Fluid-Mischvorrichtung sowohl Mischelemente umfassen, die orthogonal zur Richtung der Gasströmung angeordnet sind, als auch Mischelemente, die nicht-orthogonal zur Richtung der Gasströmung angeordnet sind, um eine optimale Vermischung des durch den Gasstrang strömenden Gases mit dem eingespritzten Fluid zu erreichen.An inventive mixing element may be arranged in the gas train so that it extends orthogonal or non-orthogonal to the direction of the gas flow in the gas train. In particular, can a gas / fluid mixing device according to the invention comprise both mixing elements, which are arranged orthogonal to the direction of gas flow, as well as mixing elements, which are arranged non-orthogonal to the direction of gas flow, for optimal mixing of the gas flowing through the gas line with the injected fluid to reach.
Die in dem Mischelement ausgebildeten Rillen können sowohl parallel zur Richtung der Gasströmung als auch nicht-parallel zur Richtung der Gasströmung ausgebildet sein, um einen besonders effektiven Transport des Fluids auf die von der Gasströmung abgewandten (Lee-)Seite des Mischelements zu ermöglichen.The grooves formed in the mixing element can be formed both parallel to the direction of the gas flow and non-parallel to the direction of the gas flow in order to allow a particularly effective transport of the fluid to the (lee) side of the mixing element facing away from the gas flow.
Zusätzlich kann auch die dem Gasstrom zugewandte Vorderseite (Luvseite) des Mischelements eine kammartige Struktur aufweisen, um die Gasströmung so zu modifizieren, dass sie eine besonders effektive Ablösung des Fluids von dem Mischelement ermöglicht. Insbesondere kann die Gasströmung durch eine auf der Vorderseite des Mischelements ausgebildete kammartige Struktur in die oder entlang der in dem Mischelement ausgebildeten Rillen geführt werden, um auf diese Weise einen besonders effektiven Transport des auf dem Mischelement abgeschiedenen Fluids zu bewirken.In addition, the front side (windward side) of the mixing element facing the gas stream may also have a comb-like structure in order to modify the gas flow in such a way that it enables a particularly effective separation of the fluid from the mixing element. In particular, the gas flow can be guided by a formed on the front of the mixing element comb-like structure in or along the grooves formed in the mixing element, in order to effect in this way a particularly effective transport of the fluid deposited on the mixing element.
Die Mischvorrichtung bzw. das Mischelement sind vorzugsweise stromabwärts in geringem Abstand hinter der Einspritzvorrichtung im Gasstrang angeordnet, um eine effektive Vermischung des von der Einspritzvorrichtung eingespritzten Fluids mit der durch den Gasstrang strömenden Gasströmung zu gewährleisten.The mixing device or the mixing element are preferably arranged downstream at a short distance behind the injection device in the gas train in order to ensure effective mixing of the fluid injected by the injection device with the gas flow flowing through the gas train.
Figurenbeschreibungfigure description
Die Erfindung wird im Folgenden anhand der beigefügten Figuren näher erläutert.The invention will be explained in more detail below with reference to the attached figures.
Dabei zeigt:Showing:
Abgase
In einem Bereich stromaufwärts des SCR-Katalysators
Zwischen der Einspritzvorrichtung
Die
Ein Teil des als Sprühnebelfilm in den Abgasstrang
Derartige Ablagerungen
Ein erfindungsgemäßes Mischelement
Auf der vom Abgasstrom
Um das Abreißen der Reduktionsmitteltropfen
Dabei können sowohl die Riefen bzw. Rillen
Alternativ können die Riefen bzw. Rillen
Zusätzlich oder alternativ können auch kammartige Spitzen
Die Struktur der Riefen bzw. Rillen
Insbesondere kann anstelle des einen, in den
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 102006019052 A1 [0003] DE 102006019052 A1 [0003]
- DE 2340483 [0003] DE 2340483 [0003]
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013211245.9A DE102013211245A1 (en) | 2013-06-17 | 2013-06-17 | mixing element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013211245.9A DE102013211245A1 (en) | 2013-06-17 | 2013-06-17 | mixing element |
Publications (1)
Publication Number | Publication Date |
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DE102013211245A1 true DE102013211245A1 (en) | 2014-12-18 |
Family
ID=52009771
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102013211245.9A Withdrawn DE102013211245A1 (en) | 2013-06-17 | 2013-06-17 | mixing element |
Country Status (1)
Country | Link |
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DE (1) | DE102013211245A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2340483A1 (en) | 1972-08-11 | 1974-02-21 | Svenska Rotor Maskiner Ab | GRATING TO BE INSERTED IN A PIPE |
DE102006019052A1 (en) | 2006-04-25 | 2007-10-31 | Robert Bosch Gmbh | Built-in component for installation in an exhaust system |
-
2013
- 2013-06-17 DE DE102013211245.9A patent/DE102013211245A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2340483A1 (en) | 1972-08-11 | 1974-02-21 | Svenska Rotor Maskiner Ab | GRATING TO BE INSERTED IN A PIPE |
DE102006019052A1 (en) | 2006-04-25 | 2007-10-31 | Robert Bosch Gmbh | Built-in component for installation in an exhaust system |
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |