KR20110138556A - Exhaust gas purification system of diesel vehicle - Google Patents

Exhaust gas purification system of diesel vehicle Download PDF

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KR20110138556A
KR20110138556A KR1020100058501A KR20100058501A KR20110138556A KR 20110138556 A KR20110138556 A KR 20110138556A KR 1020100058501 A KR1020100058501 A KR 1020100058501A KR 20100058501 A KR20100058501 A KR 20100058501A KR 20110138556 A KR20110138556 A KR 20110138556A
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diesel
exhaust gas
oxidation catalyst
diesel oxidation
gas purification
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KR1020100058501A
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Korean (ko)
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KR101628131B1 (en
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이상민
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현대자동차주식회사
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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
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

PURPOSE: An exhaust gas purifying device for a diesel vehicle is provided to reduce nitride oxide through HC-DeNOX reaction using the volume of a diesel-particulate filter and use existing diesel oxidation catalyst and diesel-particulate filter converter as it is. CONSTITUTION: An exhaust gas purifying device for a diesel vehicle comprises a housing(10), diesel oxidation catalyst(11), and a diesel-particulate filter. The housing is formed on an exhaust line. The diesel oxidation catalyst is arranged in the housing. The diesel oxidation catalyst consists of a coated area and a non-coated area(13b). Catalyst is coated on the carrier of the coated area and not on that of the non-coated area. The diesel-particulate filter is arranged on the rear of the diesel oxidation catalyst in the housing. An opening/closing unit is arranged on the diesel oxidation catalyst.

Description

디젤 차량의 배기가스 정화장치 {EXHAUST GAS PURIFICATION SYSTEM OF DIESEL VEHICLE}Exhaust gas purification system of diesel vehicle {EXHAUST GAS PURIFICATION SYSTEM OF DIESEL VEHICLE}

본 발명의 예시적인 실시예는 디젤 차량의 배기가스 정화장치에 관한 것으로서, 보다 상세하게는 디젤 산화 촉매(DOC)와 디젤 입자상 물질 필터(DPF)로 구성된 디젤 차량의 배기가스 정화장치에 관한 것이다.An exemplary embodiment of the present invention relates to an exhaust gas purification apparatus for a diesel vehicle, and more particularly, to an exhaust gas purification apparatus for a diesel vehicle composed of a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF).

일반적으로, 디젤 엔진은 저연비이면서도 고출력 및 고부하의 운전이 가능하여 그 수요가 계속 증가하고 있는 추세이다.In general, diesel engines have a low fuel consumption, high power and high load operation, the demand is continuously increasing.

그러나, 디젤 차량에 의한 대기 오염은 배기가스에 포함되어 배출되는 질소산화물(NOx)에 의한 것이며, 총 대기 오염의 약 40%를 차지할 정도로 대기 오염의 주범으로 인식되고 있고, 이에 대응하기 위하여 각 국에서는 디젤엔진의 배기가스 규제를 강화하고 있다. However, air pollution caused by diesel vehicles is caused by nitrogen oxides (NOx) emitted from the exhaust gas and is recognized as a major cause of air pollution, accounting for about 40% of total air pollution. Is tightening emissions regulations for diesel engines.

디젤 엔진용 배기가스 규제에 대응하기 위하여 초기에는 디젤 산화 촉매(Diesel Oxidize Catalyst: DOC)를 주로 적용하였으나, 점차 규제가 강화됨에 따라 최근에는 디젤 입자상 물질 필터(Diesel Particulate matter Filter: DPF)를 추가로 적용하여 대응하고 있다.In order to cope with the emission regulations for diesel engines, diesel oxidation catalysts (DOC) were mainly applied, but as the regulations are gradually strengthened, the diesel particulate filter (DPF) has recently been added. It applies and responds.

이와 같이 디젤 산화 촉매(DOC)와 디젤 입자상 물질 필터(DPF)로 구성된 배기가스 정화장치는 배기가스 중의 총 탄화수소(THC)를 이용한 HC-DeNOX 반응으로서 배기가스 중의 질소산화물(NOX)을 저감시킬 수 있다.As described above, the exhaust gas purification device including the diesel oxidation catalyst (DOC) and the diesel particulate filter (DPF) is a HC-DeNO X reaction using total hydrocarbons (THC) in the exhaust gas to reduce nitrogen oxides (NO X ) in the exhaust gas. You can.

그런데, 종래 기술에 따른 상기 배기가스 정화장치는 엔진에서 배출되는 배기가스 중의 총 탄화수소(THC)가 디젤 산화 촉매(DOC)에서 반응하여 산화되고, 디젤 산화 촉매(DOC)의 후단에 위치한 디젤 입자상 물질 필터(DPF)에 환원제로서의 HC가 충분하게 공급되지 않기 때문에, 디젤 입자상 물질 필터(DPF)에서 HC에 의한 질소산화물(NOX)의 정화율을 기대할 수 없다.However, the exhaust gas purifying apparatus according to the prior art has a total particulate matter (THC) in the exhaust gas discharged from the engine is reacted and oxidized in the diesel oxidation catalyst (DOC), diesel particulate matter located in the rear end of the diesel oxidation catalyst (DOC) Since HC as a reducing agent is not supplied sufficiently to the filter DPF, the purification rate of nitrogen oxide (NO X ) by HC cannot be expected in the diesel particulate filter DPF.

특히, 배기 온도가 상승할 경우, 디젤 산화 촉매(DOC)에 의한 HC의 산화 반응이 촉진되기 때문에 더 많은 양의 HC가 필요하고, HC의 대부분이 디젤 산화 촉매(DOC)에서 반응하게 되므로 디젤 산화 촉매(DOC)와 디젤 입자상 물질 필터(DPF)의 전체 부피에서 HC에 의한 DeNOX의 기능을 활용하지 못하게 된다.In particular, when the exhaust temperature is increased, a larger amount of HC is required because the oxidation reaction of HC by the diesel oxidation catalyst (DOC) is promoted, and since most of the HC is reacted in the diesel oxidation catalyst (DOC), diesel oxidation The entire volume of the catalyst (DOC) and diesel particulate filter (DPF) will not be able to utilize the function of DeNO X by HC.

그리고, 종래 기술에서는 HC에 의한 질소산화물(NOX)의 정화 성능을 향상시키기 위해 THC로서의 환원제를 디젤 입자상 물질 필터(DPF)에 별도로 공급할 필요가 있다.In the prior art, it is necessary to separately supply a reducing agent as THC to the diesel particulate filter (DPF) in order to improve the purification performance of nitrogen oxides (NO X ) by HC.

본 발명의 예시적인 실시예는 상기에서와 같은 문제점을 개선하기 위하여 창출된 것으로서, 디젤 산화 촉매에서 반응하는 THC의 일부를 간단한 구조로서 디젤 입자상 물질 필터에 공급하여 HC에 의한 DeNOX 반응을 유도할 수 있도록 한 디젤 차량의 배기가스 정화장치를 제공한다.Exemplary embodiments of the present invention have been created to improve the above problems, and supply a portion of THC reacted in a diesel oxidation catalyst as a simple structure to a diesel particulate filter to induce a DeNO X reaction by HC. To provide an exhaust gas purification device for a diesel vehicle.

이를 위해 본 발명의 예시적인 실시예에 따른 디젤 차량의 배기가스 정화장치는, 엔진으로부터 배출되는 배기가스 중의 질소산화물을 저감하기 위한 것으로서, ⅰ)배기라인 상에 구성되는 하우징과, ⅱ)상기 하우징의 내부에 배치되며, 담체에 촉매가 코팅된 코팅 영역과 촉매가 코팅되지 않은 비코팅 영역으로 이루어지는 디젤 산화 촉매와, ⅲ)상기 하우징의 내부에서 상기 디젤 산화 촉매의 후단에 배치되는 디젤 입자상 물질 필터를 포함하며, 상기 디젤 산화 촉매에는 배기 온도에 반응하여 상기 비코팅 영역을 선택적으로 개폐시키기 위한 개폐수단이 구성되는 것을 특징으로 한다.To this end, an exhaust gas purifying apparatus for a diesel vehicle according to an exemplary embodiment of the present invention is to reduce nitrogen oxides in exhaust gas discharged from an engine, i) a housing configured on an exhaust line, and ii) the housing. A diesel oxidation catalyst comprising a coating area coated with a catalyst and a non-coating area uncoated with a catalyst, and iii) a diesel particulate filter disposed at a rear end of the diesel oxidation catalyst inside the housing. It includes, The diesel oxidation catalyst is characterized in that the opening and closing means for selectively opening and closing the uncoated region in response to the exhaust temperature is configured.

상기 디젤 차량의 배기가스 정화장치에 있어서, 상기 개폐수단은 상기 비코팅 영역의 전단 혹은 후단에 구성될 수 있다.In the exhaust gas purification apparatus of the diesel vehicle, the opening and closing means may be configured at the front end or the rear end of the uncoated region.

상기 디젤 차량의 배기가스 정화장치에 있어서, 상기 디젤 산화 촉매는 상기 비코팅 영역이 원형 담체의 가장자리 내측에 형성될 수 있다.In the exhaust gas purification apparatus of the diesel vehicle, the diesel oxidation catalyst may have the uncoated region formed inside the edge of the circular carrier.

상기 디젤 차량의 배기가스 정화장치에 있어서, 상기 개폐수단은 상기 비코팅 영역을 선택적으로 개폐하는 커버와, 상기 커버에 연결되며 배기 온도에 따라 변형하는 바이메탈 지지체를 포함하여 이루어질 수 있다.In the exhaust gas purification apparatus of the diesel vehicle, the opening and closing means may include a cover for selectively opening and closing the uncoated region, and a bimetallic support connected to the cover and deformed according to the exhaust temperature.

상기 디젤 차량의 배기가스 정화장치에 있어서, 상기 바이메탈 지지체는 200℃ 이상에서 상기 커버를 이동시켜 상기 비코팅 영역을 개방할 수 있다.In the exhaust gas purification apparatus of the diesel vehicle, the bimetallic support may open the uncoated region by moving the cover at 200 ° C or higher.

상술한 바와 같은 본 발명의 예시적인 실시예에 따른 디젤 차량의 배기가스 정화장치에 의하면, 배기 가스 중의 THC 일부가 디젤 산화 촉매에서 반응하여 산화되고, 나머지가 THC와 CO가 디젤 산화 촉매의 비코팅 영역을 통해 디젤 입자상 물질 필터로 충분히 공급되면서 디젤 입자상 물질 필터에서의 HC-DeNOX 반응에 의한 질소산화물(NOX)의 정화율을 기대할 수 있다.According to the exhaust gas purification apparatus of a diesel vehicle according to an exemplary embodiment of the present invention as described above, a part of THC in the exhaust gas is reacted and oxidized in the diesel oxidation catalyst, the rest of the THC and CO is uncoated of the diesel oxidation catalyst As the diesel particulate filter is sufficiently supplied to the diesel particulate filter, the purification rate of nitrogen oxide (NO X ) by HC-DeNO X reaction in the diesel particulate filter can be expected.

따라서, 본 실시예에서는 디젤 산화 촉매와 더불어 디젤 입자상 물질 필터의 부피를 이용, HC-DeNOX 반응을 통해 질소산화물(NOX)을 효과적으로 저감할 수 있다.Therefore, in this embodiment, by using the volume of the diesel particulate filter in addition to the diesel oxidation catalyst, it is possible to effectively reduce the nitrogen oxides (NO X ) through the HC-DeNO X reaction.

또한, 본 실시예에서는 디젤 산화 촉매의 비코팅 영역이 디젤 입자상 물질 필터에 대한 환원제의 공급 통로 역할을 하므로, 디젤 입자상 물질 필터에 대하여 별도의 환원제 공급 없이 HC-DeNOX 반응을 통해 질소산화물(NOX)을 저감할 수 있다.In addition, in this embodiment, since the uncoated region of the diesel oxidation catalyst serves as a supply passage of the reducing agent to the diesel particulate filter, the nitrogen oxide (NO) through the HC-DeNO X reaction without supplying a reducing agent to the diesel particulate filter. X ) can be reduced.

그리고, 본 실시예에서는 기존에 양산되고 있는 디젤 산화 촉매(DOC) 및 디젤 입자상 물질 필터(DPF) 컨버터를 그대로 활용할 수 있으므로, LNT 및 SCR 보다 수평 전개가 용이하며 적용이 편리하다.In addition, in the present embodiment, since the existing mass-produced diesel oxidation catalyst (DOC) and diesel particulate filter (DPF) converter can be utilized as it is, horizontal deployment is easier and easier to apply than LNT and SCR.

이 도면들은 본 발명의 예시적인 실시예를 설명하는데 참조하기 위함이므로, 본 발명의 기술적 사상을 첨부한 도면에 한정해서 해석하여서는 아니된다.
도 1a 및 도 1b는 본 발명의 예시적인 실시예에 따른 디젤 차량의 배기가스 정화장치를 개략적으로 도시한 도면이다.
도 2는 본 발명의 예시적인 실시예에 따른 디젤 차량의 배기가스 정화장치의 작용을 설명하기 위한 도면이다.These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1A and 1B schematically illustrate an exhaust gas purifying apparatus of a diesel vehicle according to an exemplary embodiment of the present invention.
2 is a view for explaining the operation of the exhaust gas purification apparatus of a diesel vehicle according to an exemplary embodiment of the present invention.

이하, 첨부한 도면을 참고로 하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. 그러나 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 동일 또는 유사한 구성요소에 대해서는 동일한 참조 부호를 붙이도록 한다.In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

또한, 도면에서 나타난 각 구성의 크기 및 두께는 설명의 편의를 위해 임의로 나타내었으므로, 본 발명이 반드시 도면에 도시된 바에 한정되지 않으며, 여러 부분 및 영역을 명확하게 표현하기 위하여 두께를 확대하여 나타내었다.In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to those shown in the drawings, and is shown by enlarging the thickness in order to clearly express various parts and regions. It was.

도 1a 및 도 1b는 본 발명의 예시적인 실시예에 따른 디젤 차량의 배기가스 정화장치를 개략적으로 도시한 도면이다.1A and 1B schematically illustrate an exhaust gas purifying apparatus of a diesel vehicle according to an exemplary embodiment of the present invention.

도면을 참조하면, 본 발명의 예시적인 실시예에 따른 디젤 차량의 배기가스 정화장치(100)는 엔진에서 배출되는 배기가스 중의 총 탄화수소(THC)를 이용한 HC-DeNOX 반응으로서 배기가스 중의 질소산화물(NOX)을 저감시키기 위한 디젤 차량용 배기가스 후처리 시스템에 적용된다.Referring to the drawings, the exhaust gas purifying apparatus 100 of a diesel vehicle according to an exemplary embodiment of the present invention is a nitrogen oxide in the exhaust gas as HC-DeNO X reaction using the total hydrocarbon (THC) in the exhaust gas discharged from the engine Applied to diesel exhaust gas aftertreatment systems for reducing (NO X ).

본 실시예에 의한 상기 디젤 차량의 배기가스 정화장치(100)는 HC-DeNOX 반응을 통해 질소산화물(NOX)을 저감시킬 수 있는 디젤 산화 촉매(11)(Diesel Oxidize Catalyst: DOC)와, 디젤 입자상 물질 필터(21)(Diesel Particulate matter Filter: DPF)를 기본적으로 포함하여 구성된다.The exhaust gas purifying apparatus 100 of the diesel vehicle according to the present embodiment includes a diesel oxidation catalyst 11 (Diesel Oxidize Catalyst: DOC) capable of reducing nitrogen oxides (NO X ) through HC-DeNO X reaction, A diesel particulate matter filter 21 (Diesel Particulate matter Filter) is basically included.

여기서, 상기 디젤 산화 촉매(11)와 디젤 입자상 물질 필터(21)는 배기라인 상의 하우징(10) 내부에 구성되는 바, 디젤 산화 촉매(11)는 배기가스 중의 HC를 산화 반응으로서 H2O와 CO2로, CO를 CO2로, NO를 N2와 NO2로 변환시키고, 디젤 입자상 물질 필터(21)는 디젤 산화 촉매(11)의 후단에 배치되며 THC를 환원제로 사용하여 HC-DeNOX 반응이 이루어진다.Here, the diesel oxidation catalyst 11 and the diesel particulate filter 21 is configured in the housing 10 on the exhaust line, the diesel oxidation catalyst 11 is H 2 O and HC in the exhaust gas as an oxidation reaction as CO 2, CO to CO 2, NO to N 2 and was converted to NO 2, diesel particulate filter 21 is disposed downstream of a diesel oxidation catalyst (11) using THC as a reducing agent HC-DeNO X The reaction takes place.

본 실시예에서, 상기 디젤 산화 촉매(11)는 원형의 담체에 촉매가 일부 코팅된 구조로 이루어지는 바, 촉매가 코팅된 코팅 영역(13a)과 촉매가 코팅되지 않은 비코팅 영역(13b)으로 이루어진다.In the present embodiment, the diesel oxidation catalyst 11 has a structure in which a catalyst is partially coated on a circular carrier, and includes a catalyst-coated region 13a and an uncoated region 13b without a catalyst. .

이 경우, 상기 코팅 영역(13a)은 담체의 가장자리부에 형성되며, 비코팅 영역(13b)은 담체의 가장자리 내측, 바람직하게는 그 담체의 중심부에 형성될 수 있다.In this case, the coating area 13a is formed at the edge of the carrier, and the uncoated area 13b may be formed inside the edge of the carrier, preferably at the center of the carrier.

그리고, 본 실시예에서는 배기 온도에 반응하여 디젤 산화 촉매(11)의 비코팅 영역(13b)을 선택적으로 개폐시키기 위한 개폐수단(30)이 구성된다.In this embodiment, the opening and closing means 30 for selectively opening and closing the uncoated region 13b of the diesel oxidation catalyst 11 is configured in response to the exhaust temperature.

여기서, 상기 개폐수단(30)은 도 1a에서와 같이 비코팅 영역(13b)의 전단에 구성될 수 있으며, 도 1b에서와 같이 비코팅 영역(13b)의 후단에 구성될 수도 있다.Here, the opening and closing means 30 may be configured at the front end of the uncoated region 13b as in FIG. 1A, or may be configured at the rear end of the uncoated region 13b as in FIG. 1B.

대안으로서, 상기 개폐수단(30)은 비코팅 영역(13b)의 전단 및 후단에 각각 구성될 수도 있음은 당연하다 할 것이다.As an alternative, it will be appreciated that the opening and closing means 30 may be configured at the front and rear ends of the uncoated region 13b, respectively.

이러한 개폐수단(30)은 디젤 산화 촉매(11)의 비코팅 영역(13b)을 선택적으로 개폐하는 커버(31)와, 그 커버(31)에 연결되며 배기 온도에 따라 변형하는 바이메탈 지지체(33)를 포함하여 이루어진다.The opening and closing means 30 includes a cover 31 for selectively opening and closing the uncoated region 13b of the diesel oxidation catalyst 11, and a bimetallic support 33 connected to the cover 31 and deformed according to the exhaust temperature. It is made, including.

여기서, 상기 바이메탈 지지체(33)는 열팽창률이 다른 2개의 얇은 금속판이 맞붙은 것으로서, 온도의 높고 낮음에 비례해서 변형하는 성질을 지닌 통상적인 바이메탈 소재로서 이루어진다.Here, the bimetallic support 33 is formed by joining two thin metal plates having different thermal expansion coefficients, and is formed as a conventional bimetallic material having a property of deforming in proportion to high and low temperatures.

예를 들면, 상기 바이메탈 지지체(33)는 배기 온도가 200℃ 이상인 경우, 커버(31)를 이동시켜 디젤 산화 촉매(11)의 비코팅 영역(13b)을 개방할 수 있고, 배기 온도가 200℃ 미만인 경우, 커버(31)를 이동시켜 디젤 산화 촉매(11)의 비코팅 영역(13b)을 폐쇄할 수 있다.For example, when the exhaust temperature is 200 ° C or higher, the bimetallic support 33 may move the cover 31 to open the uncoated region 13b of the diesel oxidation catalyst 11, and the exhaust temperature is 200 ° C. If less, the cover 31 may be moved to close the uncoated region 13b of the diesel oxidation catalyst 11.

이하, 상기와 같이 구성되는 본 발명의 예시적인 실시예에 따른 디젤 차량의 배기가스 정화장치(100)의 작용을 첨부한 도면을 참조하여 상세하게 설명하기로 한다.Hereinafter, the operation of the exhaust gas purification apparatus 100 of a diesel vehicle according to an exemplary embodiment of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 예시적인 실시예에 따른 디젤 차량의 배기가스 정화장치의 작용을 설명하기 위한 도면이다.2 is a view for explaining the operation of the exhaust gas purification apparatus of a diesel vehicle according to an exemplary embodiment of the present invention.

도면을 참조하면, 우선 본 실시예에서는 냉시동 초기의 경우 즉, 배기 온도가 200℃ 미만인 경우, 개폐수단(30)의 커버(31)는 도 1a를 기준할 때, 디젤 산화 촉매(11)의 비코팅 영역(13b)을 폐쇄하고 있는 상태에 있다.Referring to the drawings, firstly, in the present embodiment, in the case of the initial cold start, that is, when the exhaust temperature is less than 200 ° C, the cover 31 of the opening and closing means 30 is based on the diesel oxidation catalyst 11 based on FIG. 1A. The uncoated region 13b is in a closed state.

이 경우는 배기 가스 중의 THC와 CO가 디젤 산화 촉매(11)의 비코팅 영역(13b)을 통과할 수 없으므로, 디젤 산화 촉매(11)의 비코팅 영역(13b)을 통해 디젤 입자상 물질 필터(21)로 공급되는 THC와 CO를 차단하는 것이다.In this case, since the THC and CO in the exhaust gas cannot pass through the uncoated region 13b of the diesel oxidation catalyst 11, the diesel particulate filter 21 is passed through the uncoated region 13b of the diesel oxidation catalyst 11. ) To block the THC and CO.

상기와 같은 상태에서, 예컨대 배기 온도가 200℃ 이상인 경우, 커버(31)는 바이메탈 지지체(33)의 변형에 의해 디젤 산화 촉매(11)의 비코팅 영역(13b)을 개방한다.In such a state, for example, when the exhaust temperature is 200 ° C. or more, the cover 31 opens the uncoated region 13b of the diesel oxidation catalyst 11 by deformation of the bimetallic support 33.

이에, 배기 가스 중의 THC 일부는 디젤 산화 촉매(11)의 코팅 영역(13a)에서 반응(HC-DeNOX 반응)하며 산화되고, 나머지 THC와 CO는 디젤 산화 촉매(11)의 비코팅 영역(13b)을 통과하여 디젤 입자상 물질 필터(21)로 공급된다.Accordingly, some of the THC in the exhaust gas is oxidized while reacting (HC-DeNO X reaction) in the coating region 13a of the diesel oxidation catalyst 11, and the remaining THC and CO are uncoated region 13b of the diesel oxidation catalyst 11. ) Is supplied to the diesel particulate filter 21.

따라서, 상기 디젤 입자상 물질 필터(21)에서는 THC와 CO가 환원제로서 산화되면서 HC-DeNOX 반응이 활발하게 이루어진다.Therefore, in the diesel particulate filter 21, the HC-DeNO X reaction is actively performed while THC and CO are oxidized as a reducing agent.

이로써, 본 실시예에서는 배기 가스 중의 THC 일부가 디젤 산화 촉매(11)에서 반응하여 산화되고, 나머지가 THC와 CO가 디젤 산화 촉매(11)의 비코팅 영역(13b)을 통해 디젤 입자상 물질 필터(21)로 충분히 공급되면서 디젤 입자상 물질 필터(21)에서의 HC-DeNOX 반응에 의한 질소산화물(NOX)의 정화율을 기대할 수 있다.Thus, in this embodiment, a part of THC in the exhaust gas is reacted and oxidized in the diesel oxidation catalyst 11, and the remainder is the diesel particulate filter (THC and CO through the uncoated region 13b of the diesel oxidation catalyst 11). 21), the purification rate of the nitrogen oxide (NO X ) by the HC-DeNO X reaction in the diesel particulate filter 21 can be expected.

즉, 본 실시예에서는 디젤 산화 촉매(11)와 더불어 디젤 입자상 물질 필터(21)의 부피를 이용, HC-DeNOX 반응을 통해 질소산화물(NOX)을 효과적으로 저감할 수 있게 된다.That is, in this embodiment, by using the volume of the diesel particulate filter 21 together with the diesel oxidation catalyst 11, it is possible to effectively reduce the nitrogen oxide (NO X ) through the HC-DeNO X reaction.

또한, 본 실시예에서는 디젤 산화 촉매(11)의 비코팅 영역(13b)이 디젤 입자상 물질 필터(21)에 대한 환원제의 공급 통로 역할을 하므로, 디젤 입자상 물질 필터(21)에 대하여 별도의 환원제 공급 없이 HC-DeNOX 반응을 통해 질소산화물(NOX)을 저감할 수 있다.In addition, in this embodiment, since the uncoated region 13b of the diesel oxidation catalyst 11 serves as a supply passage of the reducing agent to the diesel particulate filter 21, a separate reducing agent is supplied to the diesel particulate filter 21. It is possible to reduce NO x through HC-DeNO X reaction without.

그리고, 본 실시예에서는 기존에 양산되고 있는 디젤 산화 촉매(11) 및 디젤 입자상 물질 필터(21)의 컨버터를 그대로 활용할 수 있으므로, LNT 및 SCR 보다 수평 전개가 용이하며, 적용이 편리하다.In addition, in the present embodiment, since the converters of the diesel oxidation catalyst 11 and the diesel particulate filter 21, which are mass-produced, may be utilized as they are, horizontal deployment is easier and easier to apply than LNT and SCR.

이상을 통해 본 발명의 바람직한 실시예에 대하여 설명하였지만, 본 발명은 이에 한정되는 것이 아니고 특허청구범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러 가지로 변형하여 실시하는 것이 가능하고 이 또한 본 발명의 범위에 속하는 것은 당연하다.Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

10... 하우징 11... 디젤 산화 촉매(DOC)
13a... 코팅 영역 13b... 비코팅 영역
21... 디젤 산화 촉매(DPF) 30... 개폐수단
31... 커버 33... 바이메탈 지지체10 ... Housing 11 ... Diesel Oxidation Catalyst (DOC)
13a ... coating area 13b ... uncoated area
21. Diesel oxidation catalyst (DPF) 30 ... Switching means
31 ... Cover 33 ... Bimetallic Support

Claims (5)

엔진으로부터 배출되는 배기가스 중의 질소산화물을 저감하기 위한 디젤 차량의 배기가스 정화장치로서,
배기라인 상에 구성되는 하우징;
상기 하우징의 내부에 배치되며, 담체에 촉매가 코팅된 코팅 영역과 촉매가 코팅되지 않은 비코팅 영역으로 이루어지는 디젤 산화 촉매; 및
상기 하우징의 내부에서 상기 디젤 산화 촉매의 후단에 배치되는 디젤 입자상 물질 필터
를 포함하며,
상기 디젤 산화 촉매에는 배기 온도에 반응하여 상기 비코팅 영역을 선택적으로 개폐시키기 위한 개폐수단이 구성되는 것을 특징으로 하는 디젤 차량의 배기가스 정화장치.An exhaust gas purification device of a diesel vehicle for reducing nitrogen oxides in exhaust gas emitted from an engine,
A housing configured on the exhaust line;
A diesel oxidation catalyst disposed in the housing, the diesel oxidation catalyst including a coating region coated with a catalyst and an uncoated region not coated with a catalyst; And
Diesel particulate filter disposed at the rear of the diesel oxidation catalyst inside the housing
Including;
The diesel oxidation catalyst exhaust gas purification device of a diesel vehicle, characterized in that the opening and closing means for selectively opening and closing the uncoated region in response to the exhaust temperature. 제1 항에 있어서,
상기 개폐수단은 상기 비코팅 영역의 전단 혹은 후단에 구성되는 것을 특징으로 하는 디젤 차량의 배기가스 정화장치.The method according to claim 1,
The opening and closing means is an exhaust gas purification device of a diesel vehicle, characterized in that configured in the front or rear end of the uncoated area. 제1 항에 있어서,
상기 디젤 산화 촉매는 상기 비코팅 영역이 원형 담체의 가장자리 내측에 형성되는 것을 특징으로 하는 디젤 차량의 배기가스 정화장치.The method according to claim 1,
The diesel oxidation catalyst exhaust gas purification device of a diesel vehicle, characterized in that the uncoated region is formed inside the edge of the circular carrier. 제1 항 내지 제3 항 중에서 선택되는 어느 한 항에 있어서,
상기 개폐수단은,
상기 비코팅 영역을 선택적으로 개폐하는 커버와,
상기 커버에 연결되며 배기 온도에 따라 변형하는 바이메탈 지지체를 포함하는 것을 특징으로 하는 디젤 차량의 배기가스 정화장치.The method according to any one of claims 1 to 3,
The opening and closing means,
A cover for selectively opening and closing the uncoated area;
And a bimetallic support connected to the cover and deformed according to the exhaust temperature. 제4 항에 있어서,
상기 바이메탈 지지체는 200℃ 이상에서 상기 커버를 이동시켜 상기 비코팅 영역을 개방하는 것을 특징으로 하는 디젤 차량의 배기가스 정화장치.The method of claim 4, wherein
The bimetal support is a diesel vehicle exhaust gas purification apparatus, characterized in that for opening the uncoated area by moving the cover at 200 ℃ or more.
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