US20130104531A1 - Static mixer for mixing urea aqueous solution and engine exhaust gas - Google Patents

Static mixer for mixing urea aqueous solution and engine exhaust gas Download PDF

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Publication number
US20130104531A1
US20130104531A1 US13/808,759 US201113808759A US2013104531A1 US 20130104531 A1 US20130104531 A1 US 20130104531A1 US 201113808759 A US201113808759 A US 201113808759A US 2013104531 A1 US2013104531 A1 US 2013104531A1
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United States
Prior art keywords
static mixer
urea solution
exhaust gas
internal tube
tube
Prior art date
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Abandoned
Application number
US13/808,759
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English (en)
Inventor
Young Jin Cho
Ji Woong Park
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyundai Doosan Infracore Co Ltd
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Doosan Infracore Co Ltd
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Filing date
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Assigned to DOOSAN INFRACORE CO., LTD. reassignment DOOSAN INFRACORE CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHO, YOUNG JIN, PARK, JI WOONG
Publication of US20130104531A1 publication Critical patent/US20130104531A1/en
Abandoned legal-status Critical Current

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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
    • F01N3/24—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
    • 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
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • 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
    • B01F25/4315—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed flat pieces of material
    • 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
    • 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
    • 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
    • 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
    • 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]
    • 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 disclosure relates to a static mixer for mixing a urea solution and engine exhaust gas, and more particularly, to a static mixer for mixing a urea solution and engine exhaust gas capable of finely and evenly mixing exhaust gas discharged from an exhaust manifold of a diesel engine to an inlet portion of an SCR (Selective Catalytic Reduction) of an exhaust pipe and a urea solution supplied from a urea solution injector of the exhaust pipe to the inlet portion of the SCR in order to decrease an amount of exhaust gas generated during a combustion process of mixed gas of the diesel engine and accompanying nitrogen oxide (NOx) discharged to the atmosphere.
  • SCR Selective Catalytic Reduction
  • a diesel engine injects fuel, such as diesel, into a combustion chamber in a state where air supplied from the outside to the combustion chamber is compressed at a high temperature and high pressure, to generate output by turning force of a crank shaft connected with a connecting rod of a vertically moving piston by explosive force generated during a process of combusting and exploding mixed gas of air and fuel.
  • fuel such as diesel
  • a recent diesel engine has employed an exhaust gas post-treatment method of increasing the amount of air supplied to the combustion chamber to be larger than of the fuel supplied to the combustion chamber to considerably increase output, and making mixed gas of a urea solution and exhaust gas pass through an SCR by injecting the urea solution to the inlet portion of the SCR to change nitrogen oxide (NOx) accompanied by the exhaust gas to innoxious water (H 2 O) and nitrogen (N 2 ).
  • NOx nitrogen oxide
  • H 2 O innoxious water
  • N 2 nitrogen
  • a mixer of the diesel engine serving to mix a urea solution and exhaust gas for the exhaust gas post-treatment includes an exhaust pipe including a urea solution injector adapter in which a urea solution injector is simply mounted, and a channel unit installed inside the exhaust pipe and including a plurality of guiding channels.
  • exhaust gas generated in a combustion chamber and the urea solution injected from the urea solution injector are mixed together while passing through the plurality of guiding channels of the channel unit, to be guided to an SCR disposed at a rear side of the mixer, and the nitrogen oxide (NOx) accompanied by the exhaust gas generates catalytic reduction reaction with the urea solution while passing through the SCR to be changed to innoxious water and nitrogen.
  • NOx nitrogen oxide
  • the mixer of the diesel engine in the related art has a structure in which the channel unit including the plurality of guiding channels is simply accommodated inside the exhaust pipe, there is a problem in that the exhaust gas discharged from an exhaust manifold of the engine to the mixer is not finely and evenly mixed well with the urea solution supplied from the urea solution injector, so that an amount of nitrogen oxide (NOx) discharged to the atmosphere is not largely decreased.
  • NOx nitrogen oxide
  • the exhaust pipe accommodating the channel unit has a form of a single duct, when the urea solution is in direct contact with an inner wall surface of the exhaust pipe directly exposed to the air, the urea solution is not evaporated and flows down along the inner wall surface of the exhaust pipe, so that there is a problem in that the urea solution is not appropriately used for decreasing nitrogen oxide (NOx) and is directly discharged to the outside.
  • NOx nitrogen oxide
  • the present disclosure provides a static mixer for mixing a urea solution and engine exhaust gas, by which exhaust gas before passing through an SCR and the urea solution can be finely and evenly mixed in order to considerably decrease an amount of nitrogen oxide (NOx) discharged to the atmosphere.
  • a static mixer for mixing a urea solution and engine exhaust gas, by which exhaust gas before passing through an SCR and the urea solution can be finely and evenly mixed in order to considerably decrease an amount of nitrogen oxide (NOx) discharged to the atmosphere.
  • NOx nitrogen oxide
  • the present disclosure provides a static mixer for mixing a urea solution and engine exhaust gas, by which exhaust gas and a urea solution can be finely and evenly mixed by improving an evaporation environment of the urea solution supplied from a urea solution injector to an input portion of an SCR, thereby decreasing an amount of nitrogen oxide (NOx) discharged to the atmosphere and removing waste of the urea solution.
  • a static mixer for mixing a urea solution and engine exhaust gas, by which exhaust gas and a urea solution can be finely and evenly mixed by improving an evaporation environment of the urea solution supplied from a urea solution injector to an input portion of an SCR, thereby decreasing an amount of nitrogen oxide (NOx) discharged to the atmosphere and removing waste of the urea solution.
  • NOx nitrogen oxide
  • the present disclosure provides a static mixer for mixing a urea solution and engine exhaust gas, including: an external tube including one end portion connected to an exhaust manifold of a diesel engine, the other end portion connected to an SCR (Selective Catalytic Reduction), and a part with which a urea solution injection adaptor is provided; an internal tube installed inside the external tube so as to have a constant gap between at least a part of an outer wall surface and an inner wall surface of the external tube; and a channel unit including a plurality of guiding channels provided inside the internal tube in a longitudinal direction, and having a inlet portion facing a lower end portion of the urea solution injector adaptor.
  • SCR Selective Catalytic Reduction
  • present disclosure further provides detailed exemplary embodiments for the exemplary embodiment of the present disclosure below.
  • the internal tube may include at least one protrusion at an outer peripheral portion.
  • the channel unit may include a plurality of first channel plates arranged in the internal tube with predetermined intervals therebetween, and a plurality of second channel plates inclined at a predetermined angle with respect to the plurality of first plates and disposed to cross the plurality of first plates with predetermined intervals therebetween.
  • an exposed portion of at least one of the plurality of first and second channel plates may have at least one through hole so as to achieve a fine and even mixing behavior between the exhaust gas and the urea solution.
  • a plurality of blades may be provided at an end portion of an outlet side of at least one of the plurality of first and second channel plates so as to achieve a fine and even mixing behavior between the exhaust gas and the urea solution.
  • the plurality of blades may be inclinedly arranged in an opposite direction for each layer of the first and second channel plates.
  • the inlet portion of the channel unit may include a first inclined portion having a predetermined angle with respect to a longitudinal direction of the internal tube, and a second inclined portion having a predetermined angle with respect to the first inclined portion.
  • an orientation angle of the first inclined portion may be 0 to 30° in an outside direction with respect to a virtual axial line perpendicular to the longitudinal direction of the internal tube.
  • each of end surfaces of the first and second inclined portions at an end surface of an inlet side may have a shape of a straight line, a curved line, or a combination thereof.
  • the respective three first and second channel plates are included so as to form four rooms in one direction and the other direction, respectively.
  • the gap between the internal tube and the external tube is 5 to 10 mm.
  • the present disclosure may form fine and even mixed gas by providing the channel unit having the plurality of guiding channels and the inlet portion inside the internal tube shaped like a dual tube including the external tube surrounding the internal tube at a predetermined gap, and making the exhaust gas and the urea solution before passing through the SCR pass through the inlet portion and the plurality of guiding channels of the channel unit, thereby largely decreasing an amount of nitride oxide (NOx) discharged to the outside by improving a catalytic reduction reaction ratio in the SCR.
  • NOx nitride oxide
  • the present disclosure provides the channel unit including the plurality of guiding channels and the inlet portion inside the internal tube shaped like a dual tube to insulate the internal tube against the external tube directly exposed to the outside, so that an evaporation ratio of the urea solution supplied from the urea solution injector to the inlet portion and the plurality of guiding channels of the channel unit, thereby decreasing an amount of nitride oxide (NOx) discharged to the outside and removing waste of the urea solution.
  • NOx nitride oxide
  • FIG. 1 is a schematic perspective view illustrating a static mixer for mixing a urea solution and engine exhaust gas according to the present disclosure.
  • FIG. 2 is a schematic perspective view illustrating an end portion of an outlet of the static mixer according to the present disclosure.
  • FIG. 3 is a schematic perspective view illustrating an internal tube and a channel unit provided inside the internal tube of the static mixer according to the present disclosure.
  • FIG. 4 is a schematic cross-sectional view illustrating an angle orientation relation between a first inclined portion of a inlet portion provided at the channel unit and an external tube of the static mixer according to the present disclosure.
  • Static mixer 102 External tube 3: Internal tube 3a: Protrusion 5: Urea solution injector adaptor 10: Channel unit 11: Guiding channel 12: Bent inlet portion 12a: First inclined portion 12b: Second inclined portion 13: First channel plate 14: Second channel plate 15: Through-hole 16: Blade
  • FIGS. 1 to 4 an exemplary embodiment of a static mixer for mixing a urea solution and engine exhaust gas according to the present disclosure will be described with reference to FIGS. 1 to 4 .
  • a term “static mixer” is an expression widely used in a corresponding business field and is a counterpart concept to a dynamic mixer, and means a mixer (or a mixing device) for finely and evenly mixing exhaust gas and a urea solution without a dynamic motion.
  • two terms of “a plurality of” and “multiple” are discriminatingly used.
  • the term of “a plurality of” is used so as to emphasize a case in which a technical meaning is significant when the number of corresponding constituent elements is two or more, and the term of “multiple” is used so as to represent a case in which there are simply a lot of corresponding constituent elements.
  • the static mixer 1 of the present disclosure includes, as illustrated in FIGS. 1 to 3 , an external tube 2 , an internal tube 3 , and a channel unit 10 .
  • one end portion of the external tube 2 is connected to an exhaust manifold (not illustrated) of a diesel engine, and the other end portion is connected to an SCR (not illustrated), and a urea solution injector adaptor 5 is provided at a part of the external tube 2 .
  • the external tube 2 may be connected to an exhaust pipe (not illustrated) by a welding method or a detachable method.
  • the internal tube 3 is fixed while being accommodated inside the external tube 2 so that at least one portion of an outer wall surface of the internal tube 3 has a constant gap from an inner wall surface of the external tube 2 .
  • the channel unit 10 is provided inside the internal tube 3 and includes multiple guiding channels 11 in a longitudinal direction, and has a inlet portion 12 facing a lower end portion of the urea solution injector adaptor 5 .
  • exhaust gas discharged from the exhaust manifold to the static mixer 1 of the diesel engine and the urea solution supplied from a urea solution injector (not illustrated) installed in the urea solution injector adaptor 5 of the static mixer 1 to the static mixer 1 are finely and evenly mixed with each other while passing through the channel unit 10 including the bent inlet portion 12 and the multiple guiding channels 11 .
  • the urea solution supplied from the urea solution injector (not illustrated) installed in the urea solution injector adaptor 5 to the static mixer 1 may be injected to the channel unit 10 inside the internal tube 3 , thereby solving a problem of the related art in that the urea solution is in directly contact with the inner wall surface of the external tube 2 to be changed in a liquid state and flow down along the inner wall surface of the external tube 2 .
  • the static mixer 1 of the present disclosure enables mixed gas of the exhaust gas and the urea solution finely and evenly mixed well while passing through the static mixer to well have a catalytic reduction reaction when passing through the SCR (not illustrated), thereby eventually greatly decreasing an amount of nitrogen oxide (NOx) discharged to the air and decreasing waste of the urea solution.
  • NOx nitrogen oxide
  • the channel unit 10 may include a plurality of first channel plates 13 arranged in the internal tube 3 with predetermined intervals therebetween, and a plurality of second channel plates 14 inclined with respect to the plurality of first plates 13 at a predetermined angle, and disposed to cross the plurality of first plates 13 with predetermined intervals therebetween.
  • the plurality of guiding channels 11 for guiding the exhaust gas, the urea solution, or mixed gas in which the exhaust gas is mixed with the urea solution may be conveniently formed by a structure of the plurality of first and second channel plates.
  • an exposed portion of at least one of the plurality of first and second channel plates 13 and 14 may be provided in a form having at least one through-hole 15 so that the exhaust gas and the urea solution are evenly mixed.
  • the through hole 15 may have various shapes, such as a circular shape, an elliptical shape, a slit, or a slot.
  • a structure of the through-hole of the plurality of first and second channel plates improves an active mixing behavior between the exhaust gas and the urea solution guided to the adjacent guiding channels among the plurality of guiding channels 11 .
  • a plurality of blades 16 may be provided at an end portion of an outlet side of at least one of the plurality of first and second channel plates 13 and 14 so that the exhaust gas and the urea solution are finely and evenly mixed.
  • the plurality of blades 16 may be inclinedly arranged in an opposite direction for each layer of the first and second channel plates 13 and 14 . This is because an active mixing behavior between the exhaust gas and the urea solution is improved by creating a vortex phenomenon in the exhaust gas and the urea solution passing through the end portions of the outlet sides of the plurality of first and second channels plates 13 and 14 .
  • the internal tube 3 may be fixed concentrically or eccentrically with respect to the external tube 2 .
  • a structure in which the internal tube 3 is disposed concentrically with respect to the external tube 2 has an advantage in that the gap between the internal tube 3 and the external tube 2 may be regularly formed.
  • a structure in which the internal tube 3 is disposed eccentrically with respect to the external tube 2 has an advantage in that the internal tube 3 may be simply and conveniently fixed to the external tube 2 .
  • the gap between the internal tube 3 and the external tube 2 may be 5 to 10 mm. This is because there is a disadvantage in that an insulation effect of the internal tube 3 against the external tube 2 is decreased when the gap between the internal tube 3 and the external tube 2 is less than 5 mm, and there are high concerns regarding the direct discharge of a part of the exhaust toward the SCR without the mixing behavior with the urea solution when the gap between the internal tube 3 and the external tube 2 exceeds 10 nm.
  • the bent inlet portion 12 of the channel unit 10 may include a first inclined portion 12 a having a predetermined angle with respect to a longitudinal direction of the internal tube 3 , and a second inclined portion 12 b having a predetermined angle with respect to the first inclined portion 12 a.
  • an orientation angle of the first inclined portion 12 a may be 0 to 30° in an outside direction with respect to a virtual axial line perpendicular to the longitudinal direction of the internal tube 3 .
  • the three first channel plates 13 and the three second channel plates 14 may be included so as to have four rooms in one direction and the other direction, respectively.
  • the structure of the plurality of first and second channel plates having the aforementioned arrangement improves the mixing behavior between the exhaust gas and the urea solution compared to a case where the number of each of the first and second channels plates is smaller than 3 or exceeds 3. This is because discharge pressure of the exhaust gas and/or mixing power between the exhaust gas and the urea solution is changed according to a dense arrangement or sparse arrangement of the plurality of first and second channel plates 13 and 14 .
  • urea solution is simultaneously injected from the urea solution injector (not illustrated) installed in the urea solution injector adaptor 5 of the external tube 2 of the static mixer 1 to the inlet portion of the channel unit 10 of the static mixer 1 .
  • the exhaust gas and the urea solution are primarily finely and evenly mixed together while flowing inside the plurality of guiding channels 11 through the bent inlet portion 12 of the channel unit 10 .
  • the through-hole 15 is further provided at the exposed portions of the first and second channel plates 13 and 14 of the channel unit 10 , the mixing behavior between the exhaust gas and the urea solution passing through the plurality of guiding channels 11 may be more actively performed.
  • the exhaust gas and the urea solution discharged to the end portion of the outlet side of the channel unit 10 through the plurality of guiding channels 11 of the channel unit 10 generate a vortex while crashing against the plurality of blades 16 of the channel unit 10 , thereby being more finely and evenly mixed secondarily.
  • the static mixer for mixing a urea solution and engine exhaust gas is installed at a side of an exhaust pipe of a diesel engine to change nitrogen oxide (NOx) accompanied by the exhaust gas into innoxious water (H2O) and nitrogen (N2), so that the static mixer is usable for decreasing atmosphere environmental pollution.
  • NOx nitrogen oxide
  • H2O innoxious water
  • N2 nitrogen

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
US13/808,759 2010-07-08 2011-07-07 Static mixer for mixing urea aqueous solution and engine exhaust gas Abandoned US20130104531A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020100065983A KR101664494B1 (ko) 2010-07-08 2010-07-08 요소 수용액과 엔진 배기가스의 혼합을 위한 정적 혼합기
KR10-2010-0065983 2010-07-08
PCT/KR2011/004979 WO2012005527A2 (ko) 2010-07-08 2011-07-07 요소 수용액과 엔진 배기가스의 혼합을 위한 정적 혼합기

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US20130104531A1 true US20130104531A1 (en) 2013-05-02

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US13/808,759 Abandoned US20130104531A1 (en) 2010-07-08 2011-07-07 Static mixer for mixing urea aqueous solution and engine exhaust gas

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Country Link
US (1) US20130104531A1 (ko)
EP (1) EP2592246B1 (ko)
KR (1) KR101664494B1 (ko)
CN (1) CN102985654B (ko)
WO (1) WO2012005527A2 (ko)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150101311A1 (en) * 2012-04-24 2015-04-16 Perkins Engines Company Limited Exhaust Mixer, Emissions Cleaning Module and Method
JP2016089823A (ja) * 2014-10-31 2016-05-23 エーバーシュペッヒャー・エグゾースト・テクノロジー・ゲーエムベーハー・ウント・コンパニー・カーゲー 排気ガス処理装置
DE102016119969A1 (de) 2015-11-04 2017-05-04 Ford Global Technologies, Llc Verfahren und Systeme für einen Mischer
DE102016121870A1 (de) 2015-11-18 2017-05-18 Ford Global Technologies, Llc System für einen Harnstoffmischer
US9664082B2 (en) 2014-06-02 2017-05-30 Caterpillar Inc. Reductant dosing system having staggered injectors
CN106731932A (zh) * 2016-12-28 2017-05-31 潍柴动力股份有限公司 一种scr尿素溶液混合器
DE102017102410A1 (de) 2016-02-12 2017-08-17 Ford Global Technologies, Llc Harnstoffmischer
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DE102017116316A1 (de) 2016-07-20 2018-01-25 Ford Global Technologies, Llc Harnstoffmischer
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