KR100763411B1 - Catalytic converter with multi-arrangement type for diesel engine - Google Patents

Catalytic converter with multi-arrangement type for diesel engine Download PDF

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KR100763411B1
KR100763411B1 KR1020060048161A KR20060048161A KR100763411B1 KR 100763411 B1 KR100763411 B1 KR 100763411B1 KR 1020060048161 A KR1020060048161 A KR 1020060048161A KR 20060048161 A KR20060048161 A KR 20060048161A KR 100763411 B1 KR100763411 B1 KR 100763411B1
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South Korea
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oxidation
exhaust gas
catalyst
inner tube
catalytic converter
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KR1020060048161A
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Korean (ko)
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이진욱
정용일
조규백
김홍석
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한국기계연구원
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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
    • 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
    • F01N13/009—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 having two or more separate purifying devices arranged in series
    • F01N13/0097—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 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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
    • F01N3/28—Construction of catalytic reactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1021—Platinum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1025—Rhodium
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/10—Carbon or carbon oxides
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/12—Hydrocarbons

Abstract

A multi-arrangement type catalytic converter for a diesel engine is provided to maximize a purification efficiency of the converter by controlling the flow of exhaust gas using a solenoid valve, which is interlocked with a temperature sensor. A multi-arrangement type oxidation/reduction catalytic converter for a diesel engine comprises a fluid path(20) for discharging exhaust gas. An inner tube(28) is installed in the middle of the fluid path. A high temperature valve(27) is installed on an inner wall of the inner tube and the fluid path. An electric heater(29) is installed on the inner tube. A fourth oxidation catalyst(34) is installed at a rear side of the electrical heater in the inner tube. An oxidation/reduction catalyst complex(36) is installed at a rear side of the inner tube in the fluid path. A filtering apparatus(37) for exhaust gas is installed at a fluid exhausting end of the oxidation/reduction catalyst complex.

Description

다중배열형 디젤 산화/환원 촉매변환장치{CATALYTIC CONVERTER WITH MULTI-ARRANGEMENT TYPE FOR DIESEL ENGINE}Multi-Array Diesel Oxidation / Reduction Catalytic Converter {CATALYTIC CONVERTER WITH MULTI-ARRANGEMENT TYPE FOR DIESEL ENGINE}

도 1은 본 발명의 바람직한 실시일예에 따른 솔레노이드밸브가 장착된 촉매변환장치를 도시한 개략도이고, Figure 1 is a schematic diagram showing a catalytic converter equipped with a solenoid valve according to an embodiment of the present invention,

도 2는 본 발명의 다른 실시일예에 따른 솔레노이드밸브가 장착된 촉매변환장치를 도시한 개략도이고, Figure 2 is a schematic diagram showing a catalytic converter equipped with a solenoid valve according to another embodiment of the present invention,

도 3은 본 발명의 또다른 실시일예에 따른 전기히터가 장착된 촉매변환장치를 도시한 개략도이다.Figure 3 is a schematic diagram showing a catalytic converter equipped with an electric heater according to another embodiment of the present invention.

<도면의 주요 부분에 대한 부호 설명><Description of the symbols for the main parts of the drawings>

10 : 촉매변환장치 20 : 유로10: catalytic converter 20: flow path

21 : 제1유로 22 : 제2유로21: the first euro 22: the second euro

23 : 분리격벽 24 : 온도센서23: separating partition 24: temperature sensor

25 : 제1솔레노이드밸브 26 : 제2솔레노이드밸브25: first solenoid valve 26: second solenoid valve

27 : 고온밸브 28 : 내부관27: high temperature valve 28: inner tube

29 : 전기히터 31 : 제1산화촉매29: electric heater 31: first oxidation catalyst

32 : 제2산화촉매 33 : 제3산화촉매32: second oxidation catalyst 33: third oxidation catalyst

34 : 제4산화촉매 35 : 환원촉매34: fourth oxidation catalyst 35: reduction catalyst

36 : 산화환원복합촉매 37 : 매연여과장치(DPF)36: redox complex catalyst 37: soot filtration device (DPF)

본 발명은 디젤엔진의 산화/환원 촉매변환장치에 관한 것으로, 더 상세하게는 배출되는 배기가스의 온도에 따라 배출경로를 다르게 하고, 각 배출경로에는 배기가스의 성분분포에 적합한 촉매층을 형성하여 유해한 성분의 변환 효율을 극대화하여 환경오염을 방지하도록 한 다중배열형 디젤 산화/환원 촉매변환장치에 관한 것이다.The present invention relates to an oxidation / reduction catalytic converter of a diesel engine. More particularly, the emission path is changed according to the temperature of the exhaust gas, and in each discharge path, a catalyst layer suitable for the component distribution of the exhaust gas is harmful. The present invention relates to a multi-array diesel oxidation / reduction catalytic converter that maximizes the conversion efficiency of components to prevent environmental pollution.

상대적으로 디젤엔진은 이산화탄소(CO2)저감 및 열효율이 우수하여 연비향상된다는 사회적 인식의 전환으로, 현재에는 중/대형 경유차량과 더불어 소형 경유승용차량에도 적용/보급되고 있는 실정이다. 따라서 디젤엔진의 유해 오염물질에 대한 규제가 더욱 엄격히 강화되고 있으며, 상기 규제를 충족시키기 위한 다양한 연구가 이루어지며 현재 이에 대응하기 위해 대표적으로 사용되는 후처리기술이 디젤 산화촉매기술이다.Relatively speaking, diesel engines are transforming the social perception that fuel efficiency is improved by reducing CO 2 (CO 2 ) and thermal efficiency. Currently, diesel engines are being applied / supplied to small diesel vehicles as well as medium and large diesel vehicles. Therefore, the regulation of harmful pollutants in diesel engines is being more strictly strengthened, various studies have been made to satisfy the above regulations, and the post-treatment technology that is typically used to cope with this is the diesel oxidation catalyst technology.

예컨데, 디젤엔진은 다수의 공기에 소량의 연료를 혼합하는 공기와 연료가 균일하지 않는 공기과잉의 조건으로 연료혼합물이 공급되며, 점화는 압축 혼합물의 압축을 통해 이루어진다. 따라서 공기와 연료의 비율은 직접적으로 제어되지 않으며, 엔진출력은 흡입공기보다는 분사된 연료의 양에 의하여 결정된다. 따라서 엔진 자체에서 모든 연소반응이 완전하게 이루어지기 위한 연소기간이 충분하지 않아서 촉매에 의한 배기후처리는 필수적이다.For example, a diesel engine is supplied with a mixture of fuels in a condition where a large amount of fuel is mixed with a small amount of fuel and a fuel inconsistent air excess, and ignition is performed by compression of the compression mixture. Therefore, the ratio of air to fuel is not directly controlled, and the engine output is determined by the amount of fuel injected rather than the intake air. Therefore, after the combustion period for all combustion reactions to be complete in the engine itself is not enough, after-treatment by catalyst is essential.

또한, 디젤엔진의 배기가스는 산소분자가 많은 분위기인 희박상태에 존재함으로, 이의 정화를 위해서는 화학적으로 산화반응을 필요로 한다. 1970년대 후반에 개발된 산화촉매(oxidation catalyst)변환기는 상기 산화반응을 이용하는 것으로, 일산화탄소(CO)와 탄화수소(HC)를 저온에서 재연소시키는 촉매 산화반응으로 일으켜서, 일산화탄소는 이산화탄소, 탄화수소는 물(H2O)과 이산화탄소로 산화되어 약 80% 정화되나, 질소산화물(NOX)은 정화할 수 없다.In addition, since the exhaust gas of the diesel engine is in a lean state having a lot of oxygen molecules, it requires a chemical oxidation reaction for its purification. The oxidation catalyst converter developed in the late 1970s uses the above oxidation reaction, which is a catalytic oxidation reaction that reburns carbon monoxide (CO) and hydrocarbons (HC) at low temperatures. It is oxidized by H 2 O) and carbon dioxide, but purification of about 80%, nitrogen oxides (nO X) can not be cleaned.

따라서, 디젤엔진의 배기가스중 다량 포함되어 있는 일산화탄소와 탄화수소는 물론 질소산화물도 촉매산화반응에 의해 정화되어 정화효율을 증대시킬 수 있는 장치가 요구되고 있다.Therefore, there is a demand for an apparatus capable of increasing the purification efficiency by purifying carbon monoxide and hydrocarbons as well as nitrogen oxides contained in a large amount of exhaust gas of a diesel engine by catalytic oxidation.

이러한 배기가스의 정화에 사용되는 디젤 산화촉매변환기는 펠릿(pellet)형과 단일체(monolithic)형의 두 가지 형태로 구분될 수 있다. 현재 대부분의 경우, 벌집(honeycomb)구조의 단일체형의 산화촉매변환기를 사용하고 있다. 단일체형 촉매변환기에서는 디젤 배출가스가 벌집 형태의 세라믹 담체(substrate)를 통과하게 된다. 그리고 이 담체 내부 표면에는 직접 배출가스와 반응하는 촉매물질이 도포되어져 있다. 촉매물질로는 백금(Pt, platinum)이나 팔라듐(Pd, Palladium)을 사용하 고 있는데, 백금산화촉매(platinum-based oxidation catalyst)가 대부분을 차지하고 있다. 이 백금산화촉매의 경우, 주로 CO와 HC를 저감시키는 산화반응을 촉진시키고, 이러한 산화반응으로 NO를 NO2로 변환시킨다.The diesel oxidation catalyst converter used to purify the exhaust gas can be divided into two types, pellet type and monolithic type. Currently, in most cases, a monolithic oxidation catalyst converter having a honeycomb structure is used. In a monolithic catalytic converter, diesel exhaust gas passes through a honeycomb ceramic substrate. The inner surface of the carrier is coated with a catalytic material which reacts directly with the exhaust gas. As the catalyst material, platinum (Pt, platinum) or palladium (Pd, Palladium) is used. Platinum-based oxidation catalysts are mostly used. In the case of this platinum oxidation catalyst, an oxidation reaction mainly for reducing CO and HC is promoted, and such an oxidation reaction converts NO into NO 2 .

즉, 일반적으로 촉매변환율이 50%가 될 때의 촉매온도를 반응개시온도(light-off 온도)라고 하며, 디젤엔진의 경우 촉매 반응이 시작되는 초기 온도가 저온 시동 성능에 매우 중요한 요소가 되는 것이다. 따라서 이 온도를 저감하는 방안 및 NOX반응을 촉진하는 방안이 백금산화촉매 사용시, 함께 고려되어야 한다.In other words, the catalyst temperature when the catalytic conversion rate is 50% is called the light-off temperature. In the case of diesel engines, the initial temperature at which the catalytic reaction starts is a very important factor for the low temperature starting performance. . Therefore, when using the methods for reducing the temperature and NO X react way the platinum oxidation catalyst to promote, to be considered together.

따라서, 본 발명은 상기 종래의 문제점을 해소하기 위해 안출된 것으로,Accordingly, the present invention has been made to solve the above conventional problems,

디젤엔진의 배기가스에 포함되어 있는 유해물질을 정화시키기 위해 저온과 고온조건에서 각각 정화율이 높은 촉매필터를 다중으로 설치하여 정화가 이루어지도록 하되, 상기 촉매필터는 산화촉매필터 또는 환원촉매필터로 1차반응후 백금촉매필터에서 2차산화반응이 발생되고 최종적으로 디젤입자상물질필터를 통해 외부로 배출되게 함으로써 다중 정화가 이루어지는 촉매변환장치의 제공을 목적으로 한다.In order to purify the harmful substances contained in the exhaust gas of diesel engines, a plurality of catalyst filters having a high purification rate are respectively installed under low temperature and high temperature conditions to purify the catalyst. The catalyst filter is an oxidation catalyst filter or a reduction catalyst filter. A secondary oxidation reaction occurs in the platinum catalyst filter after the first reaction and finally discharged to the outside through the diesel particulate filter to provide a catalytic converter in which multiple purification is performed.

또한, 본 발명은 온도센서와 연계되어 개폐되는 솔레노이드밸브를 이용하여 배기가스가 산화촉매필터나 환원촉매필터로 공급되는 것을 조절하여 최적의 정화효율을 수득하는 것을 다른 목적으로 한다.In addition, another object of the present invention is to obtain an optimum purification efficiency by controlling the supply of the exhaust gas to the oxidation catalyst filter or the reduction catalyst filter using a solenoid valve that is opened and closed in connection with the temperature sensor.

상기 목적을 달성하기 위한 본 발명의 다중배열형 디젤 산화/환원 촉매변환장치는, Multi-array diesel oxidation / reduction catalytic converter of the present invention for achieving the above object,

디젤엔진의 배기가스를 정화하는 촉매변환장치에 있어서, 배기가스가 배출되는 유로가 구비되고, 유로의 중단에는 축방향으로 일정길이의 분리격벽이 형성되어 배기가스가 분리되어 진행되도록 하고, 상기 분리격벽으로 분리된 제1, 제2유로에는 제1, 제2솔레노이드 밸브를 각각 장착하여 유로의 개폐가 조절되도록 하고, 상기 분리된 제1유로에는 제1산화촉매와 제2산화촉매를 설치하고, 제2유로에는 환원촉매와 제3산화촉매를 순차적으로 설치하여 배기가스의 정화가 이루어지도록 하고, 상기 유로의 배출단부에는 매연여과장치를 장착하여 디젤입자상물질(PM)이 포집되어 연소되도록 한 것을 특징으로 한다.In a catalytic converter for purifying exhaust gas of a diesel engine, a flow path through which exhaust gas is discharged is provided, and a separation partition having a predetermined length in the axial direction is formed at an interruption of the flow path so that the exhaust gas is separated and proceeds. The first and second flow paths separated by the partition wall are equipped with first and second solenoid valves, respectively, to control opening and closing of the flow path, and the first and second oxidation catalysts are installed in the separated first flow path. In the second flow path, the reduction catalyst and the third oxidation catalyst are sequentially installed to purify the exhaust gas, and the exhaust end of the flow path is equipped with a soot filtration device to collect and burn diesel particulate matter (PM). It features.

상기 제1유로와 제2유로에 설치된 제2산화촉매와 제3산화촉매는 격벽이 끝난 부분에 하나의 일체형으로 형성하여 설치될 수 있다. The second oxidation catalyst and the third oxidation catalyst installed in the first flow passage and the second flow passage may be formed by being formed as a single body at the end of the partition wall.

또한, 상기 제1유로에는 제1솔레노이드밸브가 장착되고, 제2유로에는 제2솔레노이드밸브가 장착되되, 상기 제1유로와 제2유로가 분리되는 전방에는 온도센서를 장착하여 센서의 감지온도가 저온일 때에는 제1솔레노이드밸브를 개방하고, 감지온도가 고온일때는 제2솔레노이드밸브가 개방되도록 한다.In addition, a first solenoid valve is mounted on the first flow path, and a second solenoid valve is mounted on the second flow path, and a temperature sensor is mounted on a front side in which the first flow path and the second flow path are separated. The first solenoid valve is opened when the temperature is low, and the second solenoid valve is opened when the detection temperature is high.

상기 제1산화촉매로는 냉간상태에서 일산화탄소(CO)와 탄화수소(HC)의 저감에 효율적인 팔라듐(Pb)을 사용하고, 상기 제2 및 제3산화촉매로는 일산화탄소(CO)와 탄화수소(HC)를 저감시키는 백금(Pt)을 사용하며, 상기 환원촉매로는 산화질 소(NO)의 환원반응을 촉진시키는 로듐(Rh)을 사용한다.Palladium (Pb), which is effective for reducing carbon monoxide (CO) and hydrocarbons (HC), is used as the first oxidation catalyst in the cold state, and carbon monoxide (CO) and hydrocarbons (HC) are used as the second and third oxidation catalysts. Using platinum (Pt) to reduce the, and as the reduction catalyst is used rhodium (Rh) to promote the reduction reaction of nitric oxide (NO).

한편, 다른 실시예의 촉매변환장치는, 디젤엔진의 배기가스를 정화하는 촉매변환장치에 있어서, 배기가스가 배출되는 유로가 구비되고, 상기 유로의 중심에는 내부관을 설치하되 내부관과 유로의 내벽에는 고온밸브를 장착하여 고온의 배기가스가 유입되면 개구되도록 하고, 상기 내부관에는 전기히터를 장착하여 고온밸브가 차단시 작동되도록 하고, 상기 전기히터 후방의 내부관에는 제4산화촉매를 설치하고, 상기 설치된 내부관 후방의 유로에는 산화환원복합촉매를 설치하여 산화와 환원에 의해 정화가 이루어지도록 하고, 상기 산화환원복합촉매의 유로배출단부에는 매연여과장치를 장착하여 디젤입자상물질(PM)이 포집되어 연소되도록 할 수 있다.On the other hand, the catalytic converter of another embodiment, in the catalytic converter for purifying the exhaust gas of the diesel engine, the flow path for exhaust gas is provided, the inner tube is provided in the center of the flow path and the inner tube and the inner wall of the flow path It is equipped with a high temperature valve to open when the exhaust gas of high temperature is introduced, the inner tube is equipped with an electric heater to operate when the high temperature valve is shut off, the fourth oxidation catalyst is installed in the inner tube behind the electric heater In the flow path behind the inner tube, a redox composite catalyst is installed to purify by oxidation and reduction, and a particulate filter (PM) is installed at a channel discharge end of the redox composite catalyst. It can be captured and burned.

상기 제4산화촉매로는 일산화탄소(CO)와 탄화수소(HC)를 저감시키는 백금(Pt)을 사용하고, 상기 산화환원복합촉매로는 산화반응을 촉진시키는 백금(Pt)과 환원반응을 촉진시키는 로듐(Rh)을 사용한다.Platinum (Pt) for reducing carbon monoxide (CO) and hydrocarbons (HC) is used as the fourth oxidation catalyst, and platinum (Pt) for promoting oxidation reaction and rhodium for promoting reduction reaction are used as the redox complex catalyst. Use (Rh).

이하 도면을 참조하여 본 발명의 다중배열형 디젤 산화/환원 촉매변환장치를 상세히 설명한다.Hereinafter, a multi-array diesel oxidation / reduction catalytic converter of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 바람직한 실시일예에 따른 솔레노이드밸브가 장착된 촉매변환장치를 도시한 개략도이고, 도 2는 본 발명의 다른 실시일예에 따른 솔레노이드밸브가 장착된 촉매변환장치를 도시한 개략도이고, 도 3은 본 발명의 또다른 실시일예에 따른 전기히터가 장착된 촉매변환장치를 도시한 개략도이다.1 is a schematic diagram showing a catalytic converter equipped with a solenoid valve according to a preferred embodiment of the present invention, Figure 2 is a schematic diagram showing a catalytic converter equipped with a solenoid valve according to another embodiment of the present invention, Figure 3 is a schematic diagram showing a catalytic converter equipped with an electric heater according to another embodiment of the present invention.

도 1을 참조한 바와같이 본 발명에 따른 촉매변환장치(10)는, 배기가스가 배 출되는 유로(20)와, 상기 유로의 축방향으로 형성된 분리격벽(23)과, 상기 분리격벽에 의해 분리된 제1(21) 및 제2유로(22)에 각각 설치되는 솔레노이드밸브(25, 26), 산화촉매(31, 32, 33, 34) 및 환원촉매(35)와 상기 유로의 배출단부에 설치되는 매연여과장치(37)로 구성된다.As shown in FIG. 1, the catalytic converter 10 according to the present invention includes a flow path 20 through which exhaust gas is discharged, a separation partition 23 formed in the axial direction of the flow path, and a separation by the separation partition. The solenoid valves 25 and 26, the oxidation catalysts 31, 32, 33 and 34, and the reduction catalyst 35 and the discharge ends of the flow paths respectively installed in the first and second flow paths 21 and 22, respectively. Consisting of a soot filtration device (37).

상기 유로(20)의 중앙 부분에는 축방향으로 분리격벽(23)이 일정길이 형성되고, 상기 분리격벽으로 분리된 두 유로 중 일측을 제1유로(21)로 하고, 타측을 제2유로(22)로 한다. 상기 제1유로와 제2유로에는 솔레노이드밸브(25, 26)가 각각 장착되고, 분리격벽이 형성되는 전방인 배기가스가 유입되는 유입단부에는 온도센서(24)를 장착하여 온도에 따라 개폐되는 솔레노이드밸브(25, 26)를 다르게 한다.In the central portion of the flow path 20, a separation partition 23 is formed to have a predetermined length in the axial direction, and one side of the two flow paths separated by the separation partition is the first flow path 21, and the other flow path is the second flow path 22. ) The solenoid valves 25 and 26 are respectively installed in the first flow path and the second flow path, and the solenoids are opened and closed according to the temperature by mounting a temperature sensor 24 at an inflow end portion at which the exhaust gas, which is the front of the separation partition, is introduced. The valves 25 and 26 are different.

예컨데, 제1유로(21)에는 제1솔레노이드밸브(25)와 제1산화촉매(31) 및 제2산화촉매(32)가 순차적으로 설치되고, 제2유로(22)에는 제2솔레노이드밸브(26)와 환원촉매(35) 및 제3산화촉매(33)가 순차적으로 설치되는 것이다. 이 때 사용되는 촉매로는 팔라듐과, 로듐 및 백금을 사용함이 바람직하고, 특히 상기 로듐은 산화촉매이나 본 발명에서는 환원제 기능이 강함으로 환원촉매라 칭한다.For example, a first solenoid valve 25, a first oxidation catalyst 31, and a second oxidation catalyst 32 are sequentially installed in the first flow passage 21, and a second solenoid valve is installed in the second flow passage 22. 26), the reduction catalyst 35 and the third oxidation catalyst 33 are sequentially installed. Palladium, rhodium and platinum are preferably used as the catalyst used. Particularly, the rhodium is referred to as a reduction catalyst because the oxidum is an oxidation catalyst or a strong reducing agent in the present invention.

상기 촉매는 배기가스의 유해물질을 잘 정화시키는 것으로, CO, HC, NO, NO2, PM 이 주성분인 배기가스 중 인체나 환경에 유해한 CO, HC, NO의 정화효율이 높은 촉매이며, 접촉면적을 증가시키기 위해 벌집 형태로 형성하는 것이 바람직하다. The catalyst is to purify the harmful substances in the exhaust gas well, CO, HC, NO, NO 2 , PM is a catalyst with high purification efficiency of CO, HC, NO harmful to humans and the environment among the exhaust gas, the contact area is high It is preferable to form in the form of honeycomb to increase the.

상기 촉매 중 팔라듐(Pd, palladium)은 CO와 HC의 반응개시온도를 약 150 ~ 200℃사이로 유지할 수 있는데, 이는 기존 대비 약 100℃정도 낮은 것으로, 냉간 시동상태에서 배출되는 CO와 HC저감에 상대적으로 유리하나, NOX반응에는 불리하다. 따라서, 팔라듐은 저온 상태에서 CO와 HC정화효율이 높은 것이다.Palladium (Pd, palladium) of the catalyst can maintain the reaction start temperature of CO and HC between about 150 ~ 200 ℃, which is about 100 ℃ lower than the conventional, relative to the reduction of CO and HC discharged from the cold start state Advantageous, but disadvantageous for the NO X reaction. Therefore, palladium has high CO and HC purification efficiency at low temperature.

또한, 상기 로듐(Rh, rhodium)은 NO 환원반응을 촉진시켜 NO를 N2, CO2, H2O로 변환시킨다. 일반적으로 NO반응은 중간매체(agent) 가스인 CO와 HC가 많은 농후한 조건에서 발생되나, 로듐이 이러한 역할을 수행할 수 있다.In addition, the rhodium (Rh, rhodium) promotes the NO reduction reaction to convert NO to N 2 , CO 2 , H 2 O. In general, the NO reaction occurs under rich conditions with a lot of intermediate gases such as CO and HC, but rhodium may play this role.

그리고, 상기 백금(Pt, Platinum)은 CO와 HC를 정화하는데 잘 알려진 것으로, 일반적으로 촉매변환장치에 단독으로 사용된 촉매이다.The platinum (Pt, Platinum) is well known to purify CO and HC, and is generally a catalyst used alone in a catalytic converter.

또한, 유로(20)의 배출단부에 설치되는 매연여과장치(Diesel Particulate Filter; DPF; 37)는 디젤입자상물질(PM)을 포집하여 연소시킴으로써 배출되는 PM량을 최소화시키는 것이다.In addition, the diesel particulate filter (DPF) 37 installed at the discharge end of the flow path 20 is to minimize the amount of PM discharged by collecting and burning diesel particulate matter (PM).

이와같은 구성에서 초기 냉간 시동상태 및 저속 엔진운전영역에서는 상대적으로 저온의 배기가스가 배출된다. 이러한 배기가스의 성분은 다량의 CO, HC, NO 와 미량의 NO2, PM으로 이루어지며, 유로(20)의 유입단부로 유입되어 온도센서(24)의 감지에의해 제1솔레노이드밸브(25)를 개방시키고, 제1유로(21)를 따라 제1산화촉매(31)와 제2산화촉매(32) 및 DPF(37)를 통해 배출되는 것이다. In such a configuration, relatively low temperature exhaust gas is discharged in the initial cold start state and the low speed engine operation region. The exhaust gas is composed of a large amount of CO, HC, NO and a small amount of NO 2 and PM, and flows into the inflow end of the flow path 20 to detect the temperature sensor 24 so as to detect the first solenoid valve 25. Is opened and discharged through the first oxidation catalyst 31, the second oxidation catalyst 32, and the DPF 37 along the first flow passage 21.

이러한 과정에서 팔라듐인 제1산화촉매(31)에서는 상대적으로 낮은 온도와 다량의 O2 분위기에서 산화작용이 발생되어 CO는 CO2와 H2로, HC는 CO2와 H2O로, NO 는 NO2로 각각 정화시키는 것이다.In this process, the first oxidation catalyst 31, which is palladium, is oxidized at a relatively low temperature and a large amount of O 2 atmosphere, so that CO is CO 2 and H 2 , HC is CO 2 and H 2 O, and NO is NO. Purify with NO 2 respectively.

이러한 산화작용은 유사한 산화기능을 갖는 백금촉매인 제2산화촉매(32)에서도 동일한 산화작용이 발생하여 정화율을 더욱 향상시키게 하는 것이다. 이와같이 제1산화촉매(31)와 제2산화촉매(32)를 통과한 배기가스의 성분은 CO2, H2, H2O, NO2, PM가 되며, 이러한 성분의 배기가스는 DPF(37)를 통과하게 된다. This oxidation is the same oxidation occurs in the second oxidation catalyst 32, which is a platinum catalyst having a similar oxidation function to further improve the purification rate. Thus, the components of the exhaust gas passing through the first oxidation catalyst 31 and the second oxidation catalyst 32 are CO 2 , H 2 , H 2 O, NO 2 , PM, and the exhaust gas of these components is DPF (37). Will pass).

상기 DPF(37)에서는 PM을 포집 연소시키는데 PM의 주성분인 탄소입자가 일반적인 분위기에는 약 550℃ 이상에서 연소되나, 앞선 산화과정에서 NO2의 량이 증가되어 다량의 NO2분위기 조건이 형성됨으로 탄소입자는 약 250℃의 온도에서도 연소가 발생되어 소거되는 것이다. 따라서 최종적으로 배출되는 배기가스 성분은 CO2, H2, N2로 비교적 안정된 상태로 배출시켜 환경오염을 예방하도록 하는 것이다.The DPF (37) in the PM trapping combustion sikineunde mainly composed of carbon particles is a common atmosphere, but the combustion at least about 550 ℃, is in advanced oxidation process increases the amount of NO 2 carbon particles with a large amount of NO 2 atmosphere condition formed of PM Is a combustion occurs even at a temperature of about 250 ℃ to be eliminated. Therefore, the final exhaust gas component is CO 2 , H 2 , N 2 to be discharged in a relatively stable state to prevent environmental pollution.

한편, 고속운전시에는 상대적으로 고온의 배기가스가 배출되며, 이 때 상기 배기가스를 감지한 온도센서(24)는 제2솔레노이드밸브(26)를 개방시켜 배기가스가 제2유로(22)를 따라 환원촉매(35)와 제3산화촉매(33) 및 DPF(37)를 통해 배출되는 것이다. On the other hand, relatively high temperature exhaust gas is discharged during high speed operation. At this time, the temperature sensor 24 detecting the exhaust gas opens the second solenoid valve 26 so that the exhaust gas opens the second flow path 22. Accordingly, it is discharged through the reduction catalyst 35, the third oxidation catalyst 33 and the DPF (37).

이러한 과정에서 유로(20)로 유입된 배기가스의 성분은 다량의 CO, HC, NO, NO2, PM으로 이루어지며, 특히 NO가 다량 포함되어 있다. 이러한 배기가스는 로듐촉 매인 환원촉매(35)를 통과하면서 NO가 N2, CO2, H2O로 정화되고, 백금촉매인 제3산화촉매(33)에서 CO는 CO2와 H2로, HC는 CO2와 H2O로 각가 정화된다. 따라서, DPF(37)에 공급되는 배기가스성분은 CO2, H2, H2O, N2, NO2, PM이 되며, DPF에서는 NO2의 조건에서 PM의 탄소입자를 연소시키는 것이다.In this process, the components of the exhaust gas introduced into the flow path 20 are composed of a large amount of CO, HC, NO, NO 2 , PM, and particularly contains a large amount of NO. The exhaust gases are passing through the rhodium catalyst bound reduction catalyst (35) NO is N 2, CO 2, and purged with H 2 O, in a platinum catalyst in the third oxidation catalyst (33) CO is a CO 2 and H 2, HC is angled to CO 2 and H 2 O. Therefore, the exhaust gas components supplied to the DPF 37 are CO 2 , H 2 , H 2 O, N 2 , NO 2 , and PM. In the DPF, carbon particles of PM are burned under the condition of NO 2 .

이와같은 작용을 하는 본 발명의 촉매변환장치(10)는 도 2를 참조한 바와같이 분리격벽의 형성길이를 짧게 하고, 제1유로(21)의 제2산화촉매와 제2유로(22)의 제3산화촉매(33)를 하나의 산화촉매층(32, 33)으로 형성할 수 있다. 이때 정화작용은 상술된 과정과 동일하게 이루어진다.The catalytic converter 10 of the present invention having such a function shortens the length of formation of the separation partition as shown in FIG. 2, and the second oxidation catalyst of the first passage 21 and the second of the second passage 22. The trioxide catalyst 33 may be formed of one oxidation catalyst layer 32 or 33. At this time, the purification is performed in the same manner as described above.

다음으로, 본 발명의 촉매변환장치(10)의 다른 실시예로는 유로(20)의 중심에 내부관(28)을 설치하여 배기가스가 내부관(28)의 내부와 외부로 이동되도록 할 수 있다. 도 3을 참조한 바와같이 배기가스가 배출되는 유로의 중심에 내부관(28)이 설치되고, 상기 내부관(28)과 유로(20)의 내벽사이에는 고온밸브(27)를 장착하여 고온의 배기가스가 유로로 유입되면 개방되어 배기가스를 배출하도록 하고, 저온의 배기가스가 유입되면 고온밸브(27)는 차단되어 배기가스는 내부관(28)의 내측을 통해 배출되도록 구성된다. 이 때 상기 내부관(28)에는 유입부분에 전기히터(29)를 장착하여 고온밸브가 닫혔을 때 작동하게 함으로써 상대적으로 저온의 배기가스를 고온으로 가열하도록 하고, 내부관의 내측에는 백금촉매인 제4산화촉 매(34)가 설치되어 산화반응이 이루어지도록 하고, 내부관의 배출단부 외측인 유로에는 산화환원복합촉매(36)를 설치하여 산화반응과 환원반응이 동시에 이루어져 정화가 발생되도록 하고, 유로(20)의 단부에는 매연여과장치(37)를 설치하여 디젤입자상물질을 제거하도록 한 것이다.Next, in another embodiment of the catalytic converter 10 of the present invention by installing the inner tube 28 in the center of the flow path 20 to allow the exhaust gas to be moved into and out of the inner tube (28). have. As shown in FIG. 3, an inner tube 28 is installed at the center of the flow path through which the exhaust gas is discharged, and a high temperature valve 27 is mounted between the inner pipe 28 and the inner wall of the flow path 20 to exhaust the high temperature gas. When the gas flows into the flow path to open the exhaust gas, and when the low-temperature exhaust gas flows in, the high temperature valve 27 is blocked so that the exhaust gas is discharged through the inside of the inner tube (28). At this time, the inner tube (28) is equipped with an electric heater (29) in the inlet to operate when the high temperature valve is closed to heat the exhaust gas of relatively low temperature to a high temperature, inside the inner tube is a platinum catalyst The fourth oxidation catalyst 34 is installed to allow the oxidation reaction to occur, and the redox complex catalyst 36 is installed in the flow path outside the discharge end of the inner tube so that the oxidation reaction and the reduction reaction are performed at the same time so that purification occurs. At the end of the flow path 20, a soot filtration device 37 is installed to remove the diesel particulate matter.

이러한 구성에서 배기가스가 고온일 경우에는 고온밸브(27)가 개방되어 내부관(28)의 내외부 유로를 통해 고온의 배기가스가 배출되고, 내부관을 통해 배출되는 배기가스는 제4산화촉매(34)와 산화환원복합촉매(36)를 통해 DPF(37)에 전달되고, 내부관의 외측 유로를 통해 배출되는 배기가스는 산화환원촉매(35)만으로 통해 DPF(37)에 전달되어 DPF에서 PM을 포집 연소시키는 것이다.In this configuration, when the exhaust gas is at a high temperature, the high temperature valve 27 is opened to discharge the high temperature exhaust gas through the inner and outer flow paths of the inner tube 28, and the exhaust gas discharged through the inner tube is the fourth oxidation catalyst ( 34) and the redox composite catalyst 36 are delivered to the DPF 37, and the exhaust gas discharged through the outer flow path of the inner tube is transferred to the DPF 37 only through the redox catalyst 35, and PM in the DPF. Is to capture and burn.

한편, 배기가스가 상대적으로 저온일 경우에는 고온밸브(27)가 폐쇄되어 배기가스는 내부관(28)을 통해 배출이 이루어진다. 이때 내부관(28)에 설치된 전기히터(29)가 작동되어 저온의 배기가스를 가열하게 되며, 가열된 배기가스는 제4산화촉매(34)와 산화환원촉매(35) 및 DPF(37)를 통해 정화되어 배출되는 것이다.On the other hand, when the exhaust gas is relatively low temperature, the high temperature valve 27 is closed so that the exhaust gas is discharged through the inner tube (28). At this time, the electric heater 29 installed in the inner tube 28 is operated to heat the low-temperature exhaust gas, and the heated exhaust gas supplies the fourth oxidation catalyst 34, the redox catalyst 35, and the DPF 37. Purified and discharged through.

상기 저온의 배기가스의 경우에도 전기히터(29)에 의해 가열되어 제4산화촉매(34)에서는 고온상태의 배기가스가 전달되어 정화과정이 이루어진다. 즉, 저온의 경우에는 NO의 성분이 많이 포함되기 때문에 이를 정화시키기 위해 산화촉매(34)층을 한번더 통과시키는 것이다.The low temperature exhaust gas is also heated by the electric heater 29, and the exhaust gas in a high temperature state is transferred from the fourth oxidation catalyst 34 to perform a purification process. That is, in the case of low temperature, since a large amount of NO components are contained, the oxidation catalyst 34 passes through the layer once more to purify it.

이러한 정화과정을 간략하게 설명하면, 촉매변환장치(10)의 유로(20)로 유입되는 배기가스의 성분은 O, HC, NO, NO2, PM으로 이루어진다. 저온의 경우 내부관으 로 유입된 배기가스는 백금이 주성분인 제4산화촉매(34)에서 CO는 CO2, H2로 정화시키고, HC는 CO2, H2O로 정화시키며, NO는 NO2로 정화시키게 되는 것이다. 이와같이 1차정화가 이루어진 CO2, H2, H2O, NO2, PM 성분의 배기가스 또는 정화가 이루어지지 않고 내부관(28)의 외측 유로를 통해 배출되는 배기가스는 백금과 로듐의 혼합촉매로 이루어진 산화환원복합촉매(36)에서 잔여 NO는 N2, CO2, H2O로 정화되고, 잔여 CO는 CO2, H2로 정화시키고, 잔여 HC는 CO2, H2O로 각각 정화되는 것이다. 따라서, 최종 DPF(37)에 공급되는 배기가스 성분은 CO2, H2, H2O, N2, NO2, PM이며, DPF(37)에서는 다량의 NO2분위기가 조성되어 연소온도가 낮아짐으로 포집된 PM의 탄소입자를 약 250℃에서 연소제거하는 것이다.Briefly, this purification process, the components of the exhaust gas flowing into the flow path 20 of the catalytic converter 10 is composed of O, HC, NO, NO 2 , PM. In case of low temperature, the exhaust gas introduced into the inner tube is purified by CO 2 , H 2 , HC in CO 4 , H 2 O, and NO in NO 4 It will be purified. Thus, the exhaust gas discharged through the outer flow path of the inner tube 28 without purification or exhaust gas of the CO 2 , H 2 , H 2 O, NO 2 , and PM components, which are primarily purified, is a mixed catalyst of platinum and rhodium. In the redox composite catalyst 36, residual NO is purified by N 2 , CO 2 , H 2 O, residual CO is purified by CO 2 , H 2 , and residual HC is purified by CO 2 , H 2 O, respectively. Will be. Accordingly, the exhaust gas components supplied to the final DPF 37 are CO 2 , H 2 , H 2 O, N 2 , NO 2 , and PM, and a large amount of NO 2 atmosphere is formed in the DPF 37 to lower the combustion temperature. The carbon particles of PM collected by the combustion are removed at about 250 ° C.

한편, 상기 서술한 예는, 본 발명을 설명하고자하는 예일 뿐이다. 따라서 본 발명이 속하는 기술분야의 통상적인 전문가가 본 상세한 설명을 참조하여 부분변경 사용한 것도 본 발명의 범위에 속하는 것은 당연한 것이다.In addition, the above-mentioned example is only an example to demonstrate this invention. Therefore, it is obvious that the ordinary skilled in the art to which the present invention pertains uses the partial change with reference to the detailed description.

이상에서 살펴본 바와 같이, 본 발명의 다중배열형 디젤 산화/환원 촉매변환장치은,As described above, the multi-array diesel oxidation / reduction catalytic converter of the present invention,

디젤엔진의 배기가스에 포함되어 있는 유해물질을 정화시키기 위해 저온과 고온조건에서 각각 정화율이 높은 촉매필터를 다중으로 설치하여 정화가 이루어지도록 하되, 상기 촉매필터는 산화촉매필터 또는 환원촉매필터로 1차반응후 백금촉매필터에서 2차산화반응이 발생되고 최종적으로 디젤입자상물질필터를 통해 외부로 배출되게 함으로써 다중 정화가 이루어지도록 하는 것이다.In order to purify the toxic substances contained in the exhaust gas of diesel engine, multiple catalyst filters having high purification rate are installed at low temperature and high temperature, respectively, so that the purification can be performed. After the first reaction, the secondary oxidation reaction occurs in the platinum catalyst filter, and finally, it is discharged to the outside through the diesel particulate filter to allow multiple purification.

또한, 온도센서와 연계되어 개폐되는 솔레노이드밸브를 이용하여 배기가스가 산화촉매필터나 환원촉매필터로 공급되는 것을 조절하여 최적의 정화효율을 수득할 수 있는 환경오염을 예방하는 장치의 제공이 가능하게 된 것이다.In addition, by using a solenoid valve that is opened and closed in conjunction with a temperature sensor, it is possible to provide an apparatus for preventing environmental pollution that can obtain an optimum purification efficiency by controlling the supply of exhaust gas to the oxidation catalyst filter or reduction catalyst filter. It is.

Claims (9)

디젤엔진의 배기가스를 정화하는 촉매변환장치에 있어서,In the catalytic converter for purifying the exhaust gas of the diesel engine, 배기가스가 배출되는 유로(20)가 구비되고, 상기 유로의 중심에는 내부관(28)을 설치하되 내부관(28)과 유로(20)의 내벽에는 고온밸브(27)를 장착하여 고온의 배기가스가 유입되면 개구되도록 하고, 상기 내부관(28)에는 전기히터(29)를 장착하여 고온밸브가 차단시 작동되도록 하고, 상기 전기히터 후방의 내부관에는 제4산화촉매(34)를 설치하고, 상기 설치된 내부관 후방의 유로에는 산화환원복합촉매(36)를 설치하여 산화와 환원에 의해 정화가 이루어지도록 하고, 상기 산화환원복합촉매의 유로배출단부에는 매연여과장치(37)를 장착하여 디젤입자상물질(PM)이 포집되어 연소되도록 한 것을 특징으로 하는 다중배열형 디젤 산화/환원 촉매변환장치.A flow path 20 through which exhaust gas is discharged is provided, and an inner tube 28 is installed at the center of the flow path, and a high temperature valve 27 is mounted on the inner wall of the inner tube 28 and the flow path 20 to exhaust the high temperature. When the gas flows in and opens, the inner tube 28 is equipped with an electric heater 29 to operate when the high temperature valve is shut off, and the fourth oxidation catalyst 34 is installed in the inner tube behind the electric heater. In addition, the redox composite catalyst 36 is installed in the flow passage behind the inner tube so that purification can be performed by oxidation and reduction, and a soot filtration device 37 is installed in the flow path discharge end of the redox composite catalyst. A multi-array diesel oxidation / reduction catalytic converter characterized in that particulate matter (PM) is collected and combusted. 제 1항에 있어서,The method of claim 1, 상기 제4산화촉매(34)로는 일산화탄소(CO)와 탄화수소(HC)를 저감시키는 백금(Pt)을 사용함을 특징으로 하는 다중배열형 디젤 산화/환원 촉매변환장치.The fourth oxidation catalyst (34) is a multi-array type diesel oxidation / reduction catalytic converter characterized in that the use of platinum (Pt) to reduce the carbon monoxide (CO) and hydrocarbons (HC). 제 1항에 있어서,The method of claim 1, 상기 산화환원복합촉매(36)로는 산화반응을 촉진시키는 백금(Pt)과 환원반응을 촉진시키는 로듐(Rh)을 사용함을 특징으로 하는 다중배열형 디젤 산화/환원 촉매변환장치.The redox catalyst (36) is a multi-array type diesel oxidation / reduction catalytic converter characterized in that it uses platinum (Pt) to promote the oxidation reaction and rhodium (Rh) to promote the reduction reaction. 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011031555A2 (en) * 2009-08-27 2011-03-17 Cummins Ip, Inc. Exhaust flow segregator and associated systems and methods
CN108317602A (en) * 2018-01-19 2018-07-24 河海大学常州校区 Tandem type ring cylinder discharges and catalytic association air cleaning system

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KR950008921A (en) * 1993-09-22 1995-04-19 한승준 Variable exhaust gas purification device of automobile
JPH10266826A (en) 1997-03-21 1998-10-06 Nippon Soken Inc Exhaust gas processing device for diesel engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR950008921A (en) * 1993-09-22 1995-04-19 한승준 Variable exhaust gas purification device of automobile
JPH10266826A (en) 1997-03-21 1998-10-06 Nippon Soken Inc Exhaust gas processing device for diesel engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011031555A2 (en) * 2009-08-27 2011-03-17 Cummins Ip, Inc. Exhaust flow segregator and associated systems and methods
WO2011031555A3 (en) * 2009-08-27 2011-07-14 Cummins Ip, Inc. Exhaust flow segregator and associated systems and methods
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CN108317602A (en) * 2018-01-19 2018-07-24 河海大学常州校区 Tandem type ring cylinder discharges and catalytic association air cleaning system

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