KR20200055524A - Urea mixing device of SCR system - Google Patents

Urea mixing device of SCR system Download PDF

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KR20200055524A
KR20200055524A KR1020180139265A KR20180139265A KR20200055524A KR 20200055524 A KR20200055524 A KR 20200055524A KR 1020180139265 A KR1020180139265 A KR 1020180139265A KR 20180139265 A KR20180139265 A KR 20180139265A KR 20200055524 A KR20200055524 A KR 20200055524A
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urea water
compartment
wall portion
scr system
urea
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KR1020180139265A
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Korean (ko)
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김상범
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현대자동차주식회사
기아자동차주식회사
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Priority to KR1020180139265A priority Critical patent/KR20200055524A/en
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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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • 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
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2807—Metal other than sintered metal
    • F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
    • F01N3/2821—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates the support being provided with means to enhance the mixing process inside the converter, e.g. sheets, plates or foils with protrusions or projections to create turbulence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—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

Abstract

The present invention relates to a urea mixing device of an SCR system, and more specifically, the purpose of the present invention is to provide a urea mixing device of an SCR system in which a urea mixer having a compartment structure is newly constructed in a urea spray position inside a mixing chamber between an LNT catalyst and an SCR reactor in an engine exhaust line to prevent corrosion of the mixing chamber due to urea deposition and the like and, at the same time, to uniformly adsorb urea into the SCR reactor.

Description

SCR 시스템의 요소수 혼합 장치 {Urea mixing device of SCR system}Urea mixing device of SCR system

본 발명은 SCR 시스템의 요소수 혼합 장치에 관한 것으로서, 상세하게는 배기가스내 유해 물질을 저감하기 위해 요소수를 이용하는 SCR 시스템의 요소수 혼합 장치에 관한 것이다. The present invention relates to a device for mixing urea water in an SCR system, and more particularly, to a device for mixing urea water in an SCR system using urea water to reduce harmful substances in exhaust gas.

엔진에서 배출되는 배기가스에는 부유성 미립자와 질소산화물(NOx) 및 황산화물(SOx) 등의 유해성 기체상 물질이 포함되어 있으며, 이러한 유해 물질의 배출을 저감하기 위해 엔진 배기라인에 질소산화물을 제거하는 선택적 촉매 환원(SCR, Selective Catalytic Reduction) 반응기 등을 설치하고 있다. The exhaust gas emitted from the engine contains suspended particulates and harmful gaseous substances such as nitrogen oxides (NOx) and sulfur oxides (SOx), and nitrogen oxides are removed from the engine exhaust line to reduce the emission of these harmful substances. A selective catalytic reduction (SCR) reactor is installed.

상기 SCR 반응기(혹은 SCR 촉매라고 함)는 촉매를 이용하여 배기가스내의 질소산화물(NOx)을 인체에 무해한 질소와 물로 환원시켜 배출하는 것으로서 주로 암모니아(NH3) 또는 요소수(우레아)를 환원제로 이용한다.The SCR reactor (or SCR catalyst) is used to reduce and discharge nitrogen oxides (NOx) in exhaust gas into nitrogen and water, which are harmless to humans, and mainly use ammonia (NH3) or urea water (urea) as a reducing agent. .

종래의 SCR 시스템은 도 4에 보듯이, 질소산화물의 환원제인 요소수를 엔진 배기라인에 분사하는 요소수 인젝터(4), 상기 요소수 인젝터(4)에서 분사된 요소수를 충돌을 통해 무화시키는 플레이트형 요소수 믹서(5), 저온 조건에서 질소산화물을 흡장한 후 정화하는 LNT(Lean NOx Trap) 촉매(1), 중고속 조건에서 질소산화물을 정화하는 SCR 반응기(2), 상기 LNT 촉매(1)와 SCR 반응기(2) 사이의 유로에 해당되는 믹싱챔버(3)로 구성되어 엔진 배기라인에 배치된다.As shown in FIG. 4, the conventional SCR system atomizes the urea water injected from the urea water injector 4 that injects urea water, which is a reducing agent of nitrogen oxide, into the engine exhaust line through collision with the urea water injected from the urea water injector 4. Plate-type urea water mixer (5), LNT (Lean NOx Trap) catalyst (1) for purifying after storing nitrogen oxide at low temperature conditions, SCR reactor (2) for purifying nitrogen oxide at medium and high speed conditions, and the LNT catalyst ( It consists of a mixing chamber (3) corresponding to the flow path between 1) and the SCR reactor (2) is disposed in the engine exhaust line.

한편, 상기 SCR 반응기에서의 질소산화물 정화율을 극대화하기 위해서는 SCR 반응기에서 요소수의 농도균일도가 일정 수준 이상으로 제어되어야 한다.On the other hand, in order to maximize the nitrogen oxide purification rate in the SCR reactor, the concentration uniformity of urea water in the SCR reactor should be controlled to a certain level or more.

이에 종래의 SCR 시스템은 요소수 인젝터에 의해 배기라인내에 분사되는 요소수 분사 패턴을 고려하여 다양한 구조의 플레이트형 요소수 믹서를 적용하고 있다. Accordingly, the conventional SCR system employs a plate-type urea water mixer of various structures in consideration of the urea water injection pattern injected into the exhaust line by the urea water injector.

그러나, 종래의 SCR 시스템은 믹싱챔버내에 요소수가 분사될 때 일부 요소수가 믹싱챔버의 내벽면에 직접적으로 분사됨에 의해 액체 상태의 요소수가 믹싱챔버의 내벽면에 퇴적(deposit)되는 문제점, 상기 요소수 퇴적에 의한 믹싱챔버의 부식 문제점이 있으며, 또한 요소수 믹서에 의한 배기유로의 저항 증가에 따른 배압 증대와 온도 손실 등의 문제점이 있다. However, in the conventional SCR system, when urea water is injected into the mixing chamber, some urea water is directly sprayed on the inner wall surface of the mixing chamber, so that the urea water in a liquid state is deposited on the inner wall surface of the mixing chamber. There is a problem of corrosion of the mixing chamber due to deposition, and there is also a problem of an increase in back pressure and temperature loss due to an increase in resistance of the exhaust flow path by the urea water mixer.

또한, 종래의 SCR 시스템은 배기라인에 설치되어 있는 질소산화물 센서 등으로 요소수가 비산됨에 의해 질소산화물 센서의 신호 교란을 초래하게 되며, 요소수 믹서의 혼합 성능을 높이기 위해 요소수 인젝터에서 분사되는 요소수의 타겟팅(targeting) 관리가 중점적으로 이루어져야 하는 단점이 존재한다. In addition, the conventional SCR system causes a signal disturbance of the nitrogen oxide sensor by scattering urea water with a nitrogen oxide sensor or the like installed in the exhaust line, and the element injected from the urea water injector to increase the mixing performance of the urea water mixer. There is a disadvantage in that the number of targeting management should be focused.

공개특허 제2016-0109981호Published Patent No. 2016-0109981

본 발명은 상기와 같은 종래 문제점을 감안하여 안출한 것으로서, 엔진 배기라인의 LNT 촉매와 SCR 반응기 사이의 믹싱챔버내 요소수 분사 위치에 격실 구조를 갖는 요소수 믹서를 새롭게 구성하여 상기 믹싱챔버의 요소수 퇴적에 의한 부식 등을 방지하는 동시에 상기 SCR 반응기로의 균일한 요소수 흡장이 가능하도록 하는 SCR 시스템의 요소수 혼합 장치를 제공하는데 목적이 있다.The present invention has been devised in view of the above-described conventional problems, and newly configured a urea water mixer having a compartment structure at the urea water injection position in the mixing chamber between the LNT catalyst and the SCR reactor in the engine exhaust line to form an element of the mixing chamber. An object of the present invention is to provide a urea water mixing device of an SCR system that prevents corrosion due to water deposition and allows uniform urea water storage to the SCR reactor.

이에 본 발명에서는, 엔진 배기가스 내의 유해 물질을 제거하기 위해 엔진 배기라인에 구비된 LNT 촉매와 SCR 반응기 사이에 배기가스와 요소수의 혼합을 위한 믹싱챔버가 형성되는 SCR 시스템의 요소수 혼합 장치로서, Accordingly, in the present invention, as a urea water mixing device of an SCR system in which a mixing chamber for mixing exhaust gas and urea water is formed between an LNT catalyst and an SCR reactor provided in the engine exhaust line to remove harmful substances in the engine exhaust gas. ,

상기 믹싱챔버에 요소수를 분사하는 요소수 인젝터; 상기 믹싱챔버내에 배치되어 상기 요소수 인젝터의 요소수 분사 위치에 요소수 격실을 형성하고 상기 요소수를 충돌에 의해 무화시키는 격실형 요소수 믹서;를 포함하는 것을 특징으로 하는 SCR 시스템의 요소수 혼합 장치를 제공한다. A urea water injector for spraying urea water into the mixing chamber; It is arranged in the mixing chamber to form a urea water compartment at the urea water injection position of the urea water injector and a compartment type urea water mixer to atomize the urea water by collision; Provide a device.

구체적으로, 상기 격실형 요소수 믹서는 요소수 격실과 믹싱챔버 사이에 격벽을 형성하는 측벽부와 상기 측벽부의 하측단에 형성되는 하벽부로 이루어지며, 상기 측벽부와 하벽부에 의해 상기 믹싱챔버내에 별도로 구획되는 상기 요소수 격실을 형성하게 된다. Specifically, the compartment type urea water mixer is composed of a side wall portion forming a partition wall between the urea water compartment and the mixing chamber and a lower wall portion formed at a lower end of the side wall portion, and is formed in the mixing chamber by the side wall portion and the lower wall portion. The urea water compartment, which is separately partitioned, is formed.

이때 상기 측벽부는 요소수의 분사방향을 기준으로 상류에서 하류로 갈수록 직경이 축소되는 구조로 형성되고, 상기 하벽부는 요소수의 흐름을 방지할 수 있는 밀폐형으로 형성되는 것이 바람직하다. At this time, the side wall portion is formed in a structure in which the diameter decreases as it goes from upstream to downstream based on the injection direction of the urea water, and the lower wall portion is preferably formed in a closed type that can prevent the flow of urea water.

또한 상기 측벽부에는 요소수 격실내에서 기화 및 무화된 요소수의 배출 및 LNT 촉매를 통과한 배기가스의 출입을 위한 복수의 미세홀이 형성되며, 상기 측벽부의 하측으로 갈수록 미세홀의 직경이 점차 축소되는 것이 바람직하다. 이때 상기 미세홀 중 측벽부의 원주방향으로 배치된 미세홀은 동일 직경을 가지게 된다. In addition, a plurality of micro-holes are formed in the side wall portion for the discharge of vaporized and atomized urea water and the entry and exit of exhaust gas through the LNT catalyst in the urea water compartment, and the diameter of the micro-hole gradually decreases toward the lower side of the side wall portion. It is desirable to be. At this time, the micro-holes arranged in the circumferential direction of the sidewall portion of the micro-holes have the same diameter.

본 발명에 따른 SCR 시스템의 요소수 혼합 장치에 의하면, 격실형 요소수 믹서를 믹싱챔버내 요소수 분사 위치에 배치하여 상기 믹싱챔버의 요소수 퇴적에 의한 부식 등을 방지하는 동시에 요소수의 혼합성(분배성)과 무화성을 개선함으로써 SCR 반응기로의 균일한 요소수 흡장이 이루어지도록 할 수 있다.According to the urea water mixing device of the SCR system according to the present invention, the compartment type urea water mixer is disposed at the urea water injection position in the mixing chamber to prevent corrosion, etc. due to urea water deposition in the mixing chamber, and at the same time, the mixing ability of urea water By improving (distributibility) and atomization property, it is possible to achieve uniform urea water storage to the SCR reactor.

도 1은 본 발명에 따른 SCR 시스템의 요소수 혼합 장치를 보여주는 도면
도 2는 본 발명에 따른 격실형 요소수 믹서를 나타낸 도면
도 3은 본 발명에 따른 격실형 요소수 믹서의 작용 효과를 나타낸 도면
도 4는 종래의 요소수 믹서가 적용된 SCR 시스템을 나타낸 도면1 is a view showing a urea water mixing device of the SCR system according to the present invention
2 is a view showing a compartment type urea water mixer according to the present invention
3 is a view showing the effect of the compartment type urea water mixer according to the present invention
4 is a view showing a conventional SCR system urea water mixer is applied

이하, 본 발명을 해당 기술분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 설명하기로 한다. Hereinafter, the present invention will be described so that those skilled in the art can easily implement it.

본 발명은 엔진 배기가스 내에 함유된 유해 물질을 제거하기 위해 요소수를 이용하는 SCR 시스템의 요소수 혼합 장치에 관한 것으로, 엔진 배기라인에 구비되는 SCR 시스템의 LNT 촉매와 SCR 반응기(혹은 'SCR 촉매'라고 함) 사이에 형성되는 믹싱챔버내 요소수가 분사되는 위치(지점)에 격실형 요소수 믹서를 구성하여 상기 믹싱챔버의 요소수 퇴적에 의한 부식 등을 방지하는 동시에 상기 SCR 반응기로의 균일한 요소수 흡장이 가능하도록 한다. The present invention relates to a device for mixing urea water in an SCR system using urea water to remove harmful substances contained in engine exhaust gas, an LNT catalyst and an SCR reactor (or 'SCR catalyst') of an SCR system provided in an engine exhaust line. ) To form a compartmentalized urea water mixer at a position (point) where urea water is injected in the mixing chamber to prevent corrosion, etc. due to urea water deposition in the mixing chamber, and at the same time uniform elements into the SCR reactor Make water storage possible.

도 1에 도시된 바와 같이, 상기 SCR 시스템은 일정 온도 조건(저온 조건)에서 질소산화물을 흡장한 후 정화하는 LNT(Lean NOx Trap) 촉매(1), 일정 부하 조건(중고속 조건)에서 질소산화물을 정화하는 SCR 반응기(2), 상기 LNT 촉매(1)와 SCR 반응기(2) 사이에 요소수와 배기가스의 혼합이 이루어지는 유로를 형성하는 믹싱챔버(3), 질소산화물의 환원제인 요소수를 상기 LNT 촉매(1)와 SCR 반응기(2) 사이에 분사하는 요소수 인젝터(4), 상기 요소수 인젝터(4)에서 분사된 요소수를 충돌 등에 의해 무화시키는 격실형 요소수 믹서(10) 등을 포함하여 구성되며, 배기가스의 흐름방향을 기준으로 LNT 촉매(1), 요소수 인젝터(4)와 격실형 요소수 믹서(10)가 배치된 믹싱챔버(3), SCR 반응기(2)의 순으로 엔진 배기라인에 배치된다.As shown in Figure 1, the SCR system is a LNT (Lean NOx Trap) catalyst 1 that purifies and absorbs nitrogen oxides under a certain temperature condition (low temperature condition), nitrogen oxides under a constant load condition (medium-high-speed condition) The SCR reactor (2) for purifying the mixture, the mixing chamber (3) forming a flow path for mixing urea water and exhaust gas between the LNT catalyst (1) and the SCR reactor (2), and the urea water as a reducing agent for nitrogen oxides Urea water injector (4) injected between the LNT catalyst (1) and SCR reactor (2), compartment type urea water mixer (10) for atomizing the urea water injected from the urea water injector (4) It comprises, and based on the flow direction of the exhaust gas LNT catalyst (1), urea water injector (4) and a compartment type urea water mixer (10) of the mixing chamber (3), SCR reactor (2) It is arranged in the engine exhaust line in this order.

상기 믹싱챔버(3)는 요소수 인젝터(4)에서 분사되는 요소수와 LNT 촉매(1)를 통과한 배기가스의 혼합을 위해 LNT 촉매(1)와 SCR 반응기(2) 사이에 형성되는 배기유로로서, 믹싱챔버(3)의 내부에 요소수를 분사하는 요소수 인젝터(4)가 믹싱챔버(3)의 외측에 설치된다. The mixing chamber 3 is an exhaust passage formed between the LNT catalyst 1 and the SCR reactor 2 for mixing urea water injected from the urea water injector 4 and exhaust gas passing through the LNT catalyst 1. As, a urea water injector 4 for spraying urea water inside the mixing chamber 3 is installed outside the mixing chamber 3.

구체적으로, 상기 믹싱챔버(3)는 대략 ┌ 모양으로 굴곡된 유로로 포함하여 형성될 수 있으며, LNT 촉매(1)의 출구에 연결된 제1 유로와 SCR 반응기(2)의 입구와 연결된 제2 유로를 포함하여 형성될 수 있다. 그리고, 상기 요소수 인젝터(4)는 배기라인의 외측에 설치되어 상기 제1 유로와 제2 유로가 교차하는 지점에 요소수를 분사하도록 구성될 수 있다. Specifically, the mixing chamber 3 may be formed by including a flow path that is curved in an approximately ┌ shape, a first flow path connected to the outlet of the LNT catalyst 1 and a second flow path connected to the inlet of the SCR reactor 2 It may be formed, including. In addition, the urea water injector 4 may be installed outside the exhaust line and configured to spray urea water at a point where the first flow path and the second flow path intersect.

상기 격실형 요소수 믹서(10)는, 요소수가 분사되는 믹싱챔버(3)내 소정 위치에 설치되어 별도의 요소수 격실(11)을 형성하고 충돌에 의해 요소수를 무화시키는 것으로서, LNT 촉매(1)의 후단에 배치된 요소수 인젝터(4)의 하측에 배치될 수 있으며, 요소수 인젝터(4)에서 분사된 요소수 액체가 믹싱챔버(3)의 내벽면에 직접적으로 분사되어 퇴적(deposit)되는 것을 방지한다. The compartment-type urea water mixer 10 is installed at a predetermined position in the mixing chamber 3 in which urea water is injected to form a separate urea water compartment 11 and atomize urea water by collision. It may be disposed under the urea water injector 4 disposed at the rear end of 1), and urea water liquid sprayed from the urea water injector 4 is directly sprayed on the inner wall surface of the mixing chamber 3 to deposit. ).

다시 말해, 상기 격실형 요소수 믹서(10)는 요소수 인젝터(4)로부터 믹싱챔버(3)내에 분사되는 요소수 분사 위치에 요소수 격실(11)을 형성할 수 있도록 믹싱챔버(3)내에 설치되며, 상기 인젝터(4)에서 분사된 요소수가 믹싱챔버(3)의 내벽면쪽에 액적 상태로 비산되어 부착되는 것을 방지할 수 있도록 구성된다.In other words, the compartment-type urea water mixer 10 is in the mixing chamber 3 so as to form the urea water compartment 11 at the urea water injection position injected into the mixing chamber 3 from the urea water injector 4. It is installed, and is configured to prevent the number of elements injected from the injector 4 from being scattered and attached to the inner wall surface of the mixing chamber 3 in a droplet state.

도 2에 도시된 바와 같이, 격실형 요소수 믹서(10)는 상기 요소수 격실(11)과 믹싱챔버(3)의 내벽면 사이에 배치되어 격벽을 형성하는 측벽부(12) 및 상기 측벽부(12)의 하측단에 일체로 배치되는 하벽부(13)를 포함하여 이루어지며, 상기 측벽부(12)와 하벽부(13)에 의해 둘러싸여 믹싱챔버(3)내에 별도로 구획되는 상기 요소수 격실(11)을 형성하게 된다. 2, the compartment type urea water mixer 10 is disposed between the urea water compartment 11 and the inner wall surface of the mixing chamber 3 to form a partition wall side wall portion 12 and the side wall portion It comprises a lower wall portion 13 which is integrally disposed at the lower end of (12), and surrounded by the side wall portion 12 and the lower wall portion 13, the urea water compartment partitioned separately in the mixing chamber 3 (11) is formed.

상기 요소수 믹서(10)는 요소수 인젝터(4)에서 믹싱챔버(3)내에 분사되는 요소수 분사 위치에 별도의 요소수 격실(11)을 형성함으로써, 충돌에 의해 상기 요소수를 무화시키는 동시에, 상기 요소수가 액체 상태로 비산되어 믹싱챔버(3)의 내벽면에 직접적으로 퇴적되는 것을 방지하게 된다. 이때 요소수 인젝터(4)에서 분사되는 액체 상태의 요소수는 상기 측벽부(12)와 하벽부(13)로 둘러싸인 요소수 격실(11) 내부로 분사되어 충돌에 의해 무화되거나 믹싱챔버(3)내 배기가스의 열기에 의해 기화된다. The urea water mixer 10 forms a separate urea water compartment 11 at the urea water injection position injected into the mixing chamber 3 in the urea water injector 4, thereby atomizing the urea water by collision. , It prevents the urea water is scattered in a liquid state and directly deposited on the inner wall surface of the mixing chamber 3. At this time, the urea water in the liquid state injected from the urea water injector 4 is sprayed into the urea water compartment 11 surrounded by the side wall part 12 and the lower wall part 13 to be atomized by collision or the mixing chamber 3 It is vaporized by the heat of my exhaust gas.

또한 상기 요소수 믹서(10)는, 그 측벽부(12)가 요소수의 분사/유동방향을 기준으로 상류에서 하류로 갈수록 직경이 축소되는 구조로 형성되고, 그 하벽부(13)가 측벽부(12)의 하측단을 닫는 밀폐형 구조로 형성되는 것이 바람직하다. In addition, the urea water mixer 10, the side wall portion 12 is formed in a structure that is reduced in diameter as it goes upstream to downstream based on the injection / flow direction of the urea water, the lower wall portion 13 is a side wall portion It is preferably formed in a closed structure closing the lower end of (12).

상기 요소수 믹서(10)는 그 측벽부(12)가 요소수 격실의 하측으로 갈수록 직경(내경)이 작아지는 구조로 형성됨으로써 요소수 격실(11)내에서 미기화 및 미무화된 요소수 액체의 와류 생성을 유도할 수 있으며, 상기 와류 생성에 의해 요소수 액체의 격실(11)내 체류를 연장하고 격실(11)내 기화를 촉진시켜 요소수 액체의 유출(측벽부의 미세홀에 의한 유출)을 최소화할 수 있다. 또한 요소수 믹서(10)는 그 하벽부(13)가 밀폐형의 닫힌 구조로 형성됨으로써 아직 기화 및 무화되지 못한 요소수 액체가 요소수 격실(11) 밖으로 흘러 유출되는 것을 방지한다. 이러한 요소수 믹서(10)는 그 하측단은 밀폐되고 상측단은 개방되어 있는 테이퍼진 원통 구조로 형성될 수 있다.The urea water mixer 10 is formed in a structure in which the side wall portion 12 becomes smaller in diameter (inner diameter) toward the lower side of the urea water compartment, so that the urea water liquid that has not been vaporized and un atomized in the urea water compartment 11 is formed. Of urea can be induced, and the vortex formation extends the residence of the urea water liquid in the compartment 11 and promotes vaporization in the compartment 11, causing the urea water to flow out (outflow by micro holes in the side wall). Can be minimized. In addition, the urea water mixer 10 prevents the urea water liquid, which has not been vaporized and atomized, from flowing out of the urea water compartment 11 because the lower wall portion 13 is formed in a closed closed structure. The urea water mixer 10 may be formed in a tapered cylindrical structure in which its lower end is closed and its upper end is open.

또한, 상기 측벽부(12)에는 요소수 격실(11)내에서 기화 및 무화된 요소수의 배출 및 LNT 촉매(1)를 통과한 배기가스의 격실 출입을 위한 복수의 미세홀(14)이 형성된다. In addition, a plurality of micro-holes 14 are formed in the side wall part 12 to discharge vaporized and atomized urea water from the urea water compartment 11 and to enter and exit the compartment of the exhaust gas that has passed through the LNT catalyst 1. do.

상기 미세홀(14)은 기화된 요소수 가스 및 무화된 요소수 미립자는 통과할 수 있고, 미기화 및 미무화된 요소수 액적은 거의 통과할 수 없는 크기(직경)로 형성될 수 있으며, 측벽부(12)의 상단부에서 하단부까지 원주방향을 따라 전체적으로 배치되도록 형성될 수 있다. The micro-hole 14 may be formed in a size (diameter) in which vaporized urea water gas and atomized urea water fine particles can pass through, and unvaporized and un atomized urea water droplets cannot pass through. It may be formed to be disposed as a whole along the circumferential direction from the upper end to the lower end of the portion (12).

요소수 인젝터(4)에서 분사된 요소수 액적은 충돌에 의해 아주 작은 미립자 형태로 무화될 때 배기가스중에 비산되어 안개처럼 분무되는 효과가 발생하고, 무화된 요소수 미립자는 상기 미세홀(14)을 통과할 때 배기가스와 보다 균일하게 혼합되면서 SCR 반응기(2)의 입구 전방에 분배된다. The urea water droplets injected from the urea water injector 4 are scattered in the exhaust gas when atomized into a very small particulate form by collision, and sprayed like fog occurs, and the atomized urea water fine particles are the fine holes 14 As it passes through, it is more uniformly mixed with the exhaust gas and is distributed in front of the inlet of the SCR reactor 2.

상기 미세홀(14)은, LNT 촉매(1)에서 배출되는 배기가스가 요소수 격실(11)에 출입하도록 배기가스를 통과시킴으로써 상기 격실(11)내 요소수의 기화 및 무화를 촉진시킬 수 있으며, 요소수와 배기가스의 균일한 혼합을 유도할 수 있다(도 3 참조). 또한, 미세홀은 상기 요소수 격실(11)에서 믹싱챔버(3)로 유출되는 요소수가 SCR 반응기(2)의 입구 전방에 균일하게 배분/분포되며 배출되도록 한다. 그에 따라 요소수와 배기가스의 보다 균일한 혼합을 유도할 수 있으며, 결과적으로 SCR 반응기(2)로의 균일한 배기 유동을 형성하고 균일한 요소수 흡장을 도모할 수 있다. The micro-hole 14 can promote vaporization and atomization of the urea water in the compartment 11 by passing the exhaust gas through the exhaust gas discharged from the LNT catalyst 1 to enter and exit the urea water compartment 11, , It is possible to induce uniform mixing of urea water and exhaust gas (see FIG. 3). In addition, the micro holes allow the urea water flowing out of the urea water compartment 11 to the mixing chamber 3 to be uniformly distributed / distributed and discharged in front of the inlet of the SCR reactor 2. Accordingly, a more uniform mixing of urea water and exhaust gas can be induced, and as a result, a uniform exhaust flow to the SCR reactor 2 can be formed and uniform urea water occlusion can be promoted.

또한 상기 미세홀(14)은 요소수 격실(11)의 외부 즉, 믹싱챔버(3)로의 균일한 요소수 배출 및 분배를 도모하기 위해 위치별 직경차를 가질 수 있다. 구체적으로, 미세홀(14)은 요소수의 분사/유동방향을 기준으로 상류에서 하류로(즉, 측벽부(12)의 상측에서 하측으로) 갈수록 직경이 점차 축소될 수 있다. 이때 측벽부(12)의 원주방향으로 배치된 미세홀은 동일 직경을 가지며, 요소수의 분사방향으로 배치된 미세홀은 하류측으로 갈수록 그 크기가 점차 감소된다. 이러한 미세홀(14)의 패턴에 의해 기화 및 무화된 요소수는 (배기가스와 함께) 측벽부(12)의 외측으로 균일하게 배분되며 배출될 수 있게 된다. In addition, the micro-hole 14 may have a diameter difference for each location to promote uniform discharge and distribution of urea water to the outside of the urea water compartment 11, that is, to the mixing chamber 3. Specifically, the diameter of the micro-hole 14 may gradually decrease as it goes from upstream to downstream (that is, from the upper side to the lower side of the side wall portion 12) based on the injection / flow direction of the urea water. At this time, the micro-holes arranged in the circumferential direction of the side wall portion 12 have the same diameter, and the micro-holes arranged in the injection direction of urea water gradually decrease in size as they go downstream. By the pattern of the micro-hole 14, the number of vaporized and atomized urea is uniformly distributed to the outside of the side wall portion 12 (along with exhaust gas) and discharged.

상기와 같이 구성되는 격실형 요소수 믹서(10)는 요소수에 의한 부식 등에 강건한 재질로 형성된다. The compartment-type urea water mixer 10 configured as described above is formed of a strong material such as corrosion by urea water.

이러한 격실형 요소수 믹서(10)를 이용한 SCR 시스템의 요소수 혼합 장치는 다음과 같은 이점이 있다. The urea water mixing device of the SCR system using the compartment type urea water mixer 10 has the following advantages.

1. 믹싱챔버(3)의 내벽면에 요소수 액적이 직접적으로 분사되어 퇴적되는 것을 방지하여 상기 믹싱챔버(3)의 내부식성을 강화할 수 있다. 1. It is possible to enhance the corrosion resistance of the mixing chamber 3 by preventing the urea water droplets from being directly sprayed and deposited on the inner wall surface of the mixing chamber 3.

2. 요소수 인젝터(4)에서 (예를 들어, 3홀 분사 패턴으로) 분사되는 요소수의 혼합성(분배성)과 무화성을 개선하여 SCR 반응기(2)로의 균일한 요소수 흡장이 이루어지도록 하며, 그에 따라 SCR 반응기(2)에서의 질소산화물 정화율을 극대화할 수 있다.2. Improved mixing (distributibility) and atomization of the urea water injected from the urea water injector (for example, in a three-hole injection pattern) to achieve uniform urea water absorption into the SCR reactor 2 It is possible to maximize the nitrogen oxide purification rate in the SCR reactor 2 accordingly.

3. 믹서(10) 자체가 갖는 배기 유동 저항을 최소화하여 LNT 촉매(1)에서 SCR 반응기(2)에 도달하기까지의 배압 증대 및 온도 손실을 최소화할 수 있으며, 상기 온도 손실을 최소화함에 따라 배기가스내 입자상 물질(PM)의 재생을 위한 온도 조건을 좀더 효율적으로 확보할 수 있다.3. By minimizing the exhaust flow resistance of the mixer 10 itself, it is possible to minimize back pressure increase and temperature loss from the LNT catalyst 1 to the SCR reactor 2, and exhaust the exhaust gas by minimizing the temperature loss. Temperature conditions for the regeneration of particulate matter (PM) in the gas can be secured more efficiently.

4. 요소수 인젝터(4)에서 분사되는 요소수의 타겟팅 민감도가 종래 플레이트 타입의 요소수 믹서 대비 감소되어 요소수 충돌에 의한 무화 강건성을 확보할 수 있다. 4. The targeting sensitivity of the urea water injected from the urea water injector 4 is reduced compared to the conventional plate type urea water mixer, thereby ensuring atomization robustness due to urea water collision.

이상으로 본 발명의 실시예에 대해 상세히 설명하였는바, 본 발명의 권리범위는 상술한 실시예에 한정되지 않으며, 다음의 특허청구범위에서 정의하고 있는 본 발명의 기본 개념을 이용한 당업자의 여러 변형 및 개량 또한 본 발명의 권리범위에 포함된다.The embodiments of the present invention have been described in detail above, and the scope of the present invention is not limited to the above-described embodiments, and various modifications of those skilled in the art using the basic concepts of the present invention defined in the following claims and Improvements are also included in the scope of the present invention.

1 : LNT 촉매
2 : SCR 반응기
3 : 믹싱챔버
4 : 요소수 인젝터
10 : 격실형 요소수 믹서
11 : 요소수 격실
12 : 측벽부
13 : 하벽부
14 : 미세홀1: LNT catalyst
2: SCR reactor
3: Mixing chamber
4: Urea injector
10: compartment type urea water mixer
11: urea compartment
12: side wall part
13: lower wall
14: micro hole

Claims (7)

엔진 배기가스 내의 유해 물질을 제거하기 위해 엔진 배기라인에 구비된 LNT 촉매와 SCR 반응기 사이에 배기가스와 요소수의 혼합을 위한 믹싱챔버가 형성되는 SCR 시스템의 요소수 혼합 장치로서,
상기 믹싱챔버에 요소수를 분사하는 요소수 인젝터;
상기 믹싱챔버내에 배치되어 상기 요소수 인젝터의 요소수 분사 위치에 요소수 격실을 형성하고 상기 요소수를 무화시키는 격실형 요소수 믹서;
를 포함하는 것을 특징으로 하는 SCR 시스템의 요소수 혼합 장치.
A urea water mixing device of an SCR system in which a mixing chamber for mixing exhaust gas and urea water is formed between an LNT catalyst and an SCR reactor provided in an engine exhaust line to remove harmful substances in the engine exhaust gas,
A urea water injector for spraying urea water into the mixing chamber;
A compartment-type urea water mixer disposed in the mixing chamber to form a urea water compartment at an urea water injection position of the urea water injector and atomize the urea water;
Urea water mixing device of the SCR system, characterized in that it comprises a.
청구항 1에 있어서,
상기 격실형 요소수 믹서는 요소수 격실과 믹싱챔버 사이에 격벽을 형성하는 측벽부와 상기 측벽부의 하측단에 형성되는 하벽부로 이루어지며, 상기 측벽부와 하벽부에 의해 상기 믹싱챔버내에 별도로 구획되는 상기 요소수 격실을 형성하게 된 것을 특징으로 하는 SCR 시스템의 요소수 혼합 장치.
The method according to claim 1,
The compartment-type urea water mixer is composed of a side wall portion forming a partition wall between the urea water compartment and the mixing chamber and a lower wall portion formed at a lower end of the side wall portion, and is separately partitioned in the mixing chamber by the side wall portion and the lower wall portion. Urea water mixing device of the SCR system, characterized in that to form the urea water compartment.
청구항 2에 있어서,
상기 측벽부는 요소수의 분사방향을 기준으로 상류에서 하류로 갈수록 직경이 축소되는 구조로 형성된 것을 특징으로 하는 SCR 시스템의 요소수 혼합 장치.
The method according to claim 2,
The side wall portion is a urea water mixing device of the SCR system, characterized in that the diameter is formed in a structure that decreases in diameter from the upstream to the downstream based on the injection direction of the urea.
청구항 2에 있어서,
상기 측벽부에는 요소수 격실내에서 기화 및 무화된 요소수의 배출 및 LNT 촉매를 통과한 배기가스의 출입을 위한 복수의 미세홀이 형성된 것을 특징으로 하는 SCR 시스템의 요소수 혼합 장치.
The method according to claim 2,
A urea water mixing device of the SCR system, characterized in that a plurality of micro-holes are formed in the side wall part for discharge of vaporized and atomized urea water and entry and exit of exhaust gas through the LNT catalyst in the urea water compartment.
청구항 2에 있어서,
상기 하벽부는 요소수의 흐름을 방지할 수 있는 밀폐형으로 형성된 것을 특징으로 하는 SCR 시스템의 요소수 혼합 장치.
The method according to claim 2,
The lower wall portion urea water mixing device of the SCR system, characterized in that formed in a closed type that can prevent the flow of urea water.
청구항 4에 있어서,
상기 측벽부는 그 하측으로 갈수록 미세홀의 직경이 점차 축소되는 것을 특징으로 하는 SCR 시스템의 요소수 혼합 장치.
The method according to claim 4,
The side wall portion urea water mixing device of the SCR system, characterized in that the diameter of the micro-hole gradually decreases toward the lower side.
청구항 4에 있어서,
상기 미세홀 중 측벽부의 원주방향으로 배치된 미세홀은 동일 직경을 가지는 것을 특징으로 하는 SCR 시스템의 요소수 혼합 장치.
The method according to claim 4,
The urea water mixing device of the SCR system, characterized in that the micro-holes arranged in the circumferential direction of the sidewall portion of the micro-holes have the same diameter.
KR1020180139265A 2018-11-13 2018-11-13 Urea mixing device of SCR system KR20200055524A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114382571A (en) * 2022-01-27 2022-04-22 无锡威孚力达催化净化器有限责任公司 Layering crushing urea mixing device
US11767778B1 (en) 2022-05-31 2023-09-26 Hyundai Motor Company Urea solution mixing chamber for diesel vehicle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160109981A (en) 2015-03-13 2016-09-21 현대중공업 주식회사 Selective catalytic reduction system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160109981A (en) 2015-03-13 2016-09-21 현대중공업 주식회사 Selective catalytic reduction system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114382571A (en) * 2022-01-27 2022-04-22 无锡威孚力达催化净化器有限责任公司 Layering crushing urea mixing device
US11767778B1 (en) 2022-05-31 2023-09-26 Hyundai Motor Company Urea solution mixing chamber for diesel vehicle
KR20230166745A (en) 2022-05-31 2023-12-07 현대자동차주식회사 Device for supplying urea water diesel vehicles

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