KR100820685B1 - Selective catalytic reduction purification system - Google Patents

Selective catalytic reduction purification system Download PDF

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KR100820685B1
KR100820685B1 KR1020060125676A KR20060125676A KR100820685B1 KR 100820685 B1 KR100820685 B1 KR 100820685B1 KR 1020060125676 A KR1020060125676 A KR 1020060125676A KR 20060125676 A KR20060125676 A KR 20060125676A KR 100820685 B1 KR100820685 B1 KR 100820685B1
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case
active core
scr
temperature active
purification
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KR1020060125676A
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김동우
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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
    • F01N3/18—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]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Toxicology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

An SCR(Selective Catalytic Reduction) type purifying apparatus is provided to improve the purification efficiency of the SCR, by separating high temperature and lower temperature of exhaust gas through control of fluid flow and separating high flux and low flux of the exhaust gas. DOC(Diesel Oxidation Catalyst) or a DPF(Diesel Particle Filter) is mounted at the front of a case(100) having an inner space(120). An injector(200) is mounted at a front surface of the case to inject urea into the inner space of the case. A purifying unit(300) is mounted at a rear surface of the case to purify gas where exhaust gas inputted through the DOC or the DPF and the urea supplied through the injector are mixed. A high-temperature active core(320) is disposed at the edge of the purifying unit, and a low-temperature active core(340) is disposed at the center of the purifying unit.

Description

에스 씨 알 정화장치{Selective Catalytic Reduction purification system}Selective Catalytic Reduction purification system

도 1은 de-NOx 촉매별 온도에 대한 정화 효율을 나타낸 그래프. 1 is a graph showing the purification efficiency versus temperature for each de-NOx catalyst.

도 2는 종래의 S C R 정화장치를 나타낸 구성도. Figure 2 is a block diagram showing a conventional S C R purifier.

도 3은 본 발명에 따른 S C R 정화장치를 나타낸 구성도. Figure 3 is a block diagram showing an S C R purifier according to the present invention.

도 4는 본 발명에 따른 고효율 NOx 정화를 나타낸 흐름도.4 is a flow chart showing high efficiency NOx purification according to the present invention.

도 5는 본 발명에 따른 고효율 부가장치 작동을 나타낸 흐름도.5 is a flowchart showing the operation of the high efficiency attachment device according to the present invention.

※ 도면의 주요부분에 대한 부호의 설명. ※ Explanation of symbols for main part of drawing.

1 : ＳＣＲ정화장치, 100 : 케이스,1: Scr purification device, 100: case,

120 : 내부공간, 200 : 인젝터, 120: internal space, 200: injector,

300 : 정화부, 320 : 고온 활성코어, 300: purification unit, 320: high temperature active core,

340 : 저온 활성코어, 400 : 히터, 340: low temperature active core, 400: heater,

500 : 트윈 스로틀 밸브.500: twin throttle valve.

본 발명은 ＳＣＲ정화장치에 관한 것으로서, 더욱 상세하게는 하드웨어적으 로 유동 흐름을 조절하여 배기가스의 저온/고온 상태를 분리하고 또한 고 배기유량/저 배기유량을 분리하여 SCR의 정화효율을 높일 수 있도록 한 ＳＣＲ정화장치에 관한 것이다. The present invention relates to a scr purification device, and more specifically, it is possible to increase the purification efficiency of the SCR by separating the low / high temperature state of the exhaust gas by adjusting the flow flow in hardware and further separating the high exhaust flow rate / low exhaust flow rate. The present invention relates to an SCR purification device.

더욱 엄격해지는 NOx 배기 가스 규제를 만족하기 위해서는 상용디젤엔진 차량의 De-NOx 촉매의 적용은 세계적인 개발 추세이며 그 중 SCR 촉매가 현재 OEM의 개발 방향으로 추진되고 있다.In order to meet the stricter NOx emission regulations, the application of De-NOx catalysts in commercial diesel engine vehicles is a global development trend, of which SCR catalysts are currently being pushed toward OEM development.

또한, 향후 배기 가스 규제(예, 북미 2010년)를 만족하기 위해서는 SCR 촉매와 DPF 촉매를 모두 적용하여 NOx와 PM 규제 대응 개발을 OEM 들은 수행하고 있다.In addition, OEMs are developing responses to NOx and PM regulations by applying both SCR catalysts and DPF catalysts to meet future emission regulations (eg, North America 2010).

그리고 두 시스템간의 배열 순서는 DPF가 SCR 전단에 위치할 경우 DPF의 자연 재생 활용성 및 두 시스템의 내구성 관점의 장점이 있으며 이 조합의 경우 DPF의 강제 재생시 SCR 시스템은 고온(예, 600℃ 이상)에서 de-NOx 효율을 유지(도시된 도 1 참조)하기 위해서는 Zeolite SCR 촉매의 적용이 현재 OEM의 추세이다. The arrangement order between the two systems has advantages in terms of the natural regeneration utilization of the DPF and the durability of the two systems when the DPF is located in front of the SCR. In this combination, the SCR system has a high temperature (e.g., more than 600 ° C) when the DPF is forcedly regenerated. In order to maintain de-NOx efficiency (see FIG. 1 shown), the application of Zeolite SCR catalyst is currently the trend of OEMs.

또한, 북미 Transient 규제 모드 (상온 20℃에서 모드 시작)는 배기온 200℃ 이하의 분포가 빈번하므로 배기가스의 승온 전략이 개발의 난제인데 즉, 단열 배기관 및 후분사등의 FIE(연료분사시스템) 적용 전략 또는 대체 연소 전략(저온 연소)등인데, 이들은 연비/토크변동성/엔진 내구성 악화 등의 희생을 요구하고 있어 다양한 FLEET TEST 시험 항목을 통한 정밀한 튜닝을 요구되고 있다. In addition, the North American Transient regulation mode (starting at room temperature of 20 ℃) is frequently distributed below 200 ℃ of exhaust temperature, so the temperature raising strategy of exhaust gas is a challenge for development, that is, fuel injection system (FIE) such as adiabatic exhaust pipe and post injection. These include application strategies or alternative combustion strategies (low temperature combustion), which require fuel economy / torque variability / engine durability deterioration, requiring precise tuning through various test tests.

도시된 도 1에 의하면 SCR 촉매 중 저온 활성 효율이 양호한 V2O5 촉매의 적용이 엔진측 승온 개발 노력의 경감에 하나의 대안일 수 있지만 V2O5 촉매는 고온(450℃ 이상)에서는 효율이 악화되므로 SCR 촉매 내열 내구성이 약한 취약점이 있다. According to FIG. 1, application of the V 2 O 5 catalyst having good low temperature activity efficiency among SCR catalysts may be an alternative to reducing the development of the engine side temperature increase, but the V 2 O 5 catalyst is effective at high temperatures (above 450 ° C.). As this worsens, the SCR catalyst has a weak heat resistance durability.

도시된 도 2는 SCR 정화장치를 나타낸 구성도로 엔진의 배기메니폴드(미도시)쪽으로부터 산화촉매(10), 필터(12), 환원제 분무관(14a)이 설치되는 공간, 그리고 SCR 촉매(16)가 나란히 배열된 시스템으로 구성되어 있다.2 is a block diagram illustrating an SCR purifier and a space in which an oxidation catalyst 10, a filter 12, a reducing agent spray tube 14a is installed, and an SCR catalyst 16 from an exhaust manifold (not shown) of the engine. Consists of systems arranged side by side.

좀더 보충설명하면, 상기 환원제 분무관(14a)은 노즐을 통해 요소를 SCR 촉매(16)의 전단에 분사를 하게 되며 분사된 요소에서 암모니아 생성(가수분해, 150-180℃)된다. 이때, NH2-CO-NH2 + H20→ 2NH3 + CO2 와 같은 반응식을 얻게 되는 것이다.In further detail, the reducing agent spray tube 14a sprays urea to the front end of the SCR catalyst 16 through a nozzle and generates ammonia (hydrolysis, 150-180 ° C.) in the injected urea. In this case, a reaction scheme such as NH 2 -CO-NH 2 + H 2 0-> 2NH 3 + CO 2 is obtained.

그리고 상기와 같이 생성된 암모니아는 NOx와 반응하여 질소와 물로 변환하게 된다 이때, a NH3 + b NOx → c N2 + d H2O(대표적인 두 반응식 : ① 8NH3 + 6NO2 → 7N2 + 12H2O / ② 4NH3 + 4NO +O2 → 4N2 + 6H2O)와 같은 반응식을 얻게 되는 것이며, 여기서 미반응 NH3 는 대기 중에 배출된다.In addition, the ammonia produced as described above is converted into nitrogen and water by reacting with NOx. At this time, a NH 3 + b NO x → c N 2 + d H 2 O (Two representative equations: ① 8NH 3 + 6NO 2 → 7N 2 + 12H 2 O / ② 4NH 3 + 4NO + O 2 → 4N 2 + 6H 2 O), where the unreacted NH 3 is released to the atmosphere.

다시 말하면, 상기 SCR 정화장치의 고효율 NOx 정화율을 위해서는 정밀한 요소 분사량 제어가 요구되는데, 이때 제어 관점의 과제는 NOx 농도에 대한 요소 수용액의 양이 함수 정립되어 있지 않은 문제점이 있었다. In other words, precise urea injection amount control is required for the high efficiency NOx purification rate of the SCR purifier. In this case, the problem of the control point is that the amount of the urea aqueous solution with respect to the NOx concentration is not functioned.

즉, 비선형적인 관계가 아닌 배기온도, 배기유량(촉매 반응을 위한 촉매 체류 시간), NO2의 함량(빠른 반응을 위한 Radical), 촉매의 암모니아 storage capacity 등의 함수이고, 단순히 NOx 환원효율을 높이기 위해 요소를 추가 분사시 NOx 환원에 사용되지 않고 암모니아의 tailpipe로의 배출(암모니아 슬립)만 결과로 나타날 수 있기 때문이다. That is, it is not a non-linear relationship but a function of exhaust temperature, exhaust flow rate (catalyst residence time for catalyst reaction), NO 2 content (radical for fast reaction), ammonia storage capacity of catalyst, and simply increase NOx reduction efficiency. This is because only the release of ammonia into the tailpipe (ammonia slip) can result in the additional injection of the hazard without the use of NOx reduction.

따라서, 엔진 운전 상태와 연동된 SCR 시스템의 성능 특성 파악을 통해 상기 언급한 비선형적인 관계(배기온도, 유량, 암모니아 storage 특성)를 엔진 운전상태 및 엔진 기종별로 규명되어 모델링되어야 NOx 센서 신호값에 의존한 Fast Feedback Close Loop의 Urea 분사량 제어가 필요한 실정이다. Therefore, the above-mentioned nonlinear relationship (exhaust temperature, flow rate, ammonia storage characteristics) should be identified and modeled by engine operating state and engine type through the performance characteristics of the SCR system linked to the engine operating state. Urea injection rate control of a Fast Feedback Close Loop is needed.

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 하드웨어적으로 유동 흐름을 조절하여 배기가스의 저온/고온 상태를 분리하고 또한 고 배기유량/저 배기유량을 분리하여 SCR의 정화효율을 높일 수 있도록 한 ＳＣＲ정화장치를 제공하는데 목적이 있다. The present invention has been made to solve the above problems, by adjusting the flow flow in hardware to separate the low / high temperature state of the exhaust gas and also to separate the high exhaust flow rate / low exhaust flow rate to increase the purification efficiency of the SCR An object of the present invention is to provide a scr purification device.

상기와 같은 목적을 달성하기 위하여 본 발명은, ＳＣＲ정화장치에 있어서, 전방으로 디젤산화촉매(DOC) 또는 디젤입자상 물질필터(DPF)가 장착되고 내부로 장착공간이 형성되는 케이스와, 상기 케이스의 전면에 장착되어 내부로 요소를 분사하는 인젝터와, 상기 케이스의 내부공간 후면에 장착되어 상기 디젤산화촉매 또는 디젤입자상 물질필터를 통해 유입된 배기가스와 인젝터를 통해 공급된 요소가 혼합된 기체를 정화하되, 가장자리로는 고온 활성코어가 중앙으로는 저온 활성코어가 마련되는 정화부를 포함하여 이루어지는 것을 특징으로 한다. In order to achieve the above object, the present invention, in the SC purification apparatus, the case is equipped with a diesel oxidation catalyst (DOC) or a diesel particulate filter (DPF) in the front and the mounting space is formed therein, An injector mounted on the front and injecting the urea into the interior, and a gas mixed with the exhaust gas introduced through the diesel oxidation catalyst or the diesel particulate filter and the urea supplied through the injector are mounted on the rear of the inner space of the case. However, the edge is characterized in that the high temperature active core comprises a purifying unit provided with a low temperature active core in the center.

이하, 본 발명의 구성을 첨부된 도면을 참조로 설명하면, 도 3은 본 발명에 따른 S C R 정화장치를 나타낸 구성도이고, 도 4는 본 발명에 따른 고효율 NOx 정화를 나타낸 흐름도이며, 도 5는 본 발명에 따른 고효율 부가장치 작동을 나타낸 흐름도이다. Hereinafter, the configuration of the present invention with reference to the accompanying drawings, Figure 3 is a block diagram showing an SCR purification apparatus according to the present invention, Figure 4 is a flow chart showing a high efficiency NOx purification according to the present invention, Figure 5 A flowchart illustrating the operation of the high efficiency attachment device according to the present invention.

본 발명의 ＳＣＲ정화장치(100)는 내부로 장착공간(120)이 형성되는 케이스(100)와, 상기 케이스(100)의 전면에 장착되고 내부로 요소를 분사하는 인젝터(200)와, 상기 케이스(100)의 내부공간(120) 후면에 장착되어 혼합된 기체를 정화하는 정화부(300)로 대별할 수 있다. The scr purification apparatus 100 of the present invention includes a case 100 in which a mounting space 120 is formed therein, an injector 200 mounted on the front of the case 100 and injecting an element therein, and the case. Mounted on the rear of the inner space 120 of 100 may be divided into a purification unit 300 for purifying the mixed gas.

내부로 장착공간(120)이 마련되는 케이스(100)는 소정의 구간을 가지고 형성되고 전방으로 디젤산화촉매(DOC) 또는 디젤입자상 물질필터(DPF)가 설치되어 배기가스가 공급되게 된다. The case 100 in which the mounting space 120 is provided inside is formed to have a predetermined section, and a diesel oxidation catalyst (DOC) or a diesel particulate filter (DPF) is installed forward to supply exhaust gas.

상기 케이스(100)의 전면에 장착되는 인젝터(200)는 제어된 신호에 따라 요소를 상기 케이스(100)의 내부공간(120)을 공급분사하게 된다. The injector 200 mounted on the front of the case 100 supplies and sprays the elements to the internal space 120 of the case 100 according to a controlled signal.

상기 케이스(100)의 후면에 장착되어 혼합된 기체를 정화하는 정화부(300)는 케이스(100)의 전방에 설치되는 디젤산화촉매 또는 디젤입자상 물질필터를 통해 유입되는 배기가스와 상기 인젝터(200)를 통해 공급된 요소가 혼합된 기체를 정화하는 역할을 하게 된다. The purifying unit 300 mounted on the rear of the case 100 to purify the mixed gas includes exhaust gas and the injector 200 introduced through a diesel oxidation catalyst or a diesel particulate filter installed in front of the case 100. The urea supplied through) serves to purify the mixed gas.

그리고 상기 정화부(300)는 가장자리로 고온 활성코어(320)가 중앙으로는 저온 활성코어(340)가 구성되며 여기서 상기 고온 활성코어(320)는 정상적인 상태에서 상기 케이스(100)의 중/고부하의 배기(배기온 200℃ 이상)에 상용엔진 고부하 또는 디젤입자상 물질필터 강제 재생 전/후 운전영역(고온 600℃ 이상)에서도 de- NOx 효율 및 내열 내구성을 유지할 수 있는 좋은 Zeolite 촉매가 사용된다. In addition, the purification unit 300 is composed of a high temperature active core 320 at the edge and a low temperature active core 340 at the center, where the high temperature active core 320 is in a normal state of the heavy / high load of the case 100. Good Zeolite catalyst is used to maintain de-NOx efficiency and heat resistance even in the operating area (high temperature above 600 ℃) of commercial engine high load or diesel particulate filter forced regeneration to exhaust (exhaust temperature 200 ℃).

또한, 상기 저온 활성코어(340)는 시동 후부터 DOC LIGHT-OFF시까지의 저온영역(저부하 영역 포함)에서 고효율의 de-NOx 좋은 V205 촉매가 사용된다. In addition, the low temperature active core 340 uses a highly efficient de-NOx good V205 catalyst in a low temperature region (including a low load region) from starting up to DOC LIGHT-OFF.

그리고 상기 정화부(300)로는 히터(400)와 트윈 스로틀 밸브(500)가 더 포함되어 구성될 수 있는데, 상기 히터(400)는 상기 케이스(100)에 장착되는 정화부(300)의 전면 중앙에 장착되어 상기 저온 활성코어(340)의 활성을 촉진시키기 역할을 하게 된다. The purifier 300 may further include a heater 400 and a twin throttle valve 500. The heater 400 may include a front center of the purifier 300 mounted on the case 100. Is mounted on the serves to promote the activity of the low temperature active core 340.

또한, 상기 트윈 스로틀 밸브(500)는 상기 히터(400)의 전면에 장착되어 저온 활성코어(340)와 고온 활성코어(320)에 공급되는 혼합 기체를 개폐하는 역할을 하게 된다. In addition, the twin throttle valve 500 is mounted on the front surface of the heater 400 to open and close the mixed gas supplied to the low temperature active core 340 and the high temperature active core 320.

상기와 같이 구성되는 본 발명의 실시 예를 설명하면 다음과 같다. Referring to the embodiment of the present invention configured as described above are as follows.

먼저, 내부공간(120)이 형성되는 케이스(100)의 전방으로 디젤산화촉매(DOC) 또는 디젤입자상 물질필터(DPF)가 장착한 후 상기 케이스(100)의 전면에 인젝터(200)를 장착한다. First, the diesel oxidation catalyst (DOC) or the diesel particulate filter (DPF) is mounted to the front of the case 100 in which the inner space 120 is formed, and then the injector 200 is mounted on the front of the case 100. .

그리고 상기 케이스(100)의 내부공간(120) 후면으로 가장자리에 고온 활성코어(320)가 중앙으로는 저온 활성코어(340)가 마련되는 정화부(300)를 장착하되, 상기 정화부(300)의 전면 중앙으로 저온 활성코어(340)의 활성을 촉진시키기 위해 히터(400)와 상기 히터(400)의 전면으로 저온 활성코어(340)와 고온 활성코어(320)에 공급되는 혼합 기체를 개폐하기 위해 트윈 스로틀 밸브(500)가 더 포함되어 장착하면 ＳＣＲ정화장치(1)는 조립이 완료된다. In addition, a purification unit 300 having a high temperature active core 320 at the edge of the inner space 120 of the case 100 and a low temperature active core 340 at the center thereof is mounted, and the purification unit 300 is disposed. Opening and closing the mixed gas supplied to the heater 400 and the low temperature active core 340 and the high temperature active core 320 to the front of the heater 400 to promote the activity of the low temperature active core 340 toward the front center of the heater 400. In order to further include a twin throttle valve 500, the SRC purifier 1 is assembled.

이때, 상기 정화부(300)에 장착되는 고온 활성코어(320)는 Zeolite 촉매를 사용하고 저온 활성코어(340)는 V205 촉매를 사용한다. At this time, the high temperature active core 320 mounted on the purification unit 300 uses a zeolite catalyst and the low temperature active core 340 uses a V205 catalyst.

상기와 같이 상태에서 도시된 도 4 및 5와 같은 흐름을 가지고 진행을 하게된다. It proceeds with the flow as shown in Figures 4 and 5 shown in the above state.

즉, 입력측에서는 NOx 센서 값(SCR 전/후단)과, 공기유량 센서값과, NH3 센서값과, 배기온도(SCR 전/후단)와, 배기 배압과, 요소 시스템 값을 정한 후 다음 단계인 요소 분사량 계산과 SCR 모니터링과 고효율 목적의 부가장치 작동계산을 한 후 출력측에 전달되면 인젝터에서 이에 대응하는 요소를 케이스(100)의 내부공간에 분사하게 되는 것이다. That is, the input side determines the NOx sensor value (before / after SCR), air flow sensor value, NH3 sensor value, exhaust temperature (before / after SCR), exhaust back pressure, and element system value. After the injection amount calculation, SCR monitoring and operation of the additional device for the purpose of high efficiency is delivered to the output side, the injector to inject the corresponding element into the inner space of the case 100.

좀더 보충설명하면, 입력측에서 유입되는 공기의 유량센서 값과 배기온도를 측정한 후 배기온도 값이 설정온도 1보다 작게 되면 트윈 스로틀의 내측을 전개하게 되고 반대로 설정온도 1보다 크게 되면 트윈 스로틀 외측을 전개하여 출력측에 전달되는 것이다. More specifically, after measuring the flow sensor value and the exhaust temperature of the air flowing from the input side, if the exhaust temperature value is lower than the set temperature 1, the inner side of the twin throttle is developed. It is expanded and passed to the output.

그리고 상기 트윈 스로틀의 내측이 전개되고 배기유량이 저온 활성촉매의 설계 용량을 초과하게 되면 트윈 스로틀 외측을 전개하여 출력측에 전달되고, 배기유량이 저온 활성촉매의 설계보다 작고 배기온도가 설정온도 2보다 작을 경우 히터는 가열되어 출력측에 전달하게 되는 것이다. When the inside of the twin throttle is developed and the exhaust flow rate exceeds the design capacity of the low temperature active catalyst, the outside of the twin throttle is developed and transmitted to the output side, and the exhaust flow rate is smaller than the design of the low temperature active catalyst, and the exhaust temperature is less than the set temperature 2. If small, the heater is heated and delivered to the output side.

본 발명에 따르면, 하드웨어적으로 유동 흐름을 조절하여 배기가스의 저온/고온 상태를 분리하고 또한 고 배기유량/저 배기유량을 분리하여 SCR의 정화효율을 높일 수 있는 효과가 있다.According to the present invention, it is possible to increase the purification efficiency of the SCR by separating the low / high temperature state of the exhaust gas by adjusting the flow flow in hardware and further separating the high exhaust flow rate / low exhaust flow rate.

Claims (5)

ＳＣＲ정화장치에 있어서, In scr purifier, 전방으로 디젤산화촉매(DOC) 또는 디젤입자상 물질필터(DPF)가 장착되고 내부로 내부공간(120)이 형성되는 케이스(100)와, A case 100 in which a diesel oxidation catalyst (DOC) or a diesel particulate filter (DPF) is mounted forward and an inner space 120 is formed therein; 상기 케이스(100)의 전면에 장착되어 내부로 요소를 분사하는 인젝터(200)와, An injector 200 mounted to the front of the case 100 to inject the element into the inside; 상기 케이스(100)의 내부공간(120) 후면에 장착되어 상기 디젤산화촉매 또는 디젤입자상 물질필터를 통해 유입된 배기가스와 인젝터(200)를 통해 공급된 요소가 혼합된 기체를 정화하되, 가장자리로는 고온 활성코어(320)가 중앙으로는 저온 활성코어(340)가 마련되는 정화부(300)를 포함하여 이루어지는 것을 특징으로 하는 ＳＣＲ정화장치.It is mounted on the rear of the inner space 120 of the case 100 to purify the gas mixed with the exhaust gas introduced through the diesel oxidation catalyst or diesel particulate filter and the urea supplied through the injector 200, to the edge SRC purification apparatus, characterized in that the high temperature active core 320 comprises a purification unit 300 is provided with a low temperature active core 340 in the center. 제 1항에 있어서, The method of claim 1, 상기 케이스(100)에 장착되는 정화부(300)의 전면 중앙으로 저온 활성코어(340)의 활성을 촉진시키기 위해 히터(400)가 더 포함되어 이루어지는 것을 특징으로 하는 ＳＣＲ정화장치.Scr purification device, characterized in that further comprises a heater 400 to promote the activity of the low-temperature active core 340 to the front center of the purification unit 300 mounted to the case 100. 제 2항에 있어서, The method of claim 2, 상기 히터(400)의 전면으로 저온 활성코어(340)와 고온 활성코어(320)에 공급되는 혼합 기체를 개폐하기 위해 트윈 스로틀 밸브(500)가 더 포함되어 이루어지는 것을 특징으로 하는 ＳＣＲ정화장치. SRC purification apparatus further comprises a twin throttle valve (500) to open and close the mixed gas supplied to the low temperature active core (340) and the high temperature active core 320 to the front of the heater (400). 제 1항에 있어서, The method of claim 1, 상기 정화부(300)에 장착되는 저온 활성코어(340)는 V205 촉매로 형성되는 것을 특징으로 하는 ＳＣＲ정화장치.The low temperature active core 340 mounted on the purification unit 300 is scr purifier, characterized in that formed with a V205 catalyst. 제 1항에 있어서, The method of claim 1, 상기 정화부(300)에 장착되는 고온 활성코어(320)는 Zeolite 촉매로 형성되는 것을 특징으로 하는 ＳＣＲ정화장치.Scr purifier, characterized in that the high temperature active core 320 is mounted to the purification unit 300 is formed of a zeolite catalyst.
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KR101028556B1 (en) 2008-12-05 2011-04-11 기아자동차주식회사 System for purifying exhaust gas

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JPH11159320A (en) 1997-11-28 1999-06-15 Tokyo Gas Co Ltd Exhaust emission control device for internal combustion engine
EP1281842A2 (en) 2001-07-31 2003-02-05 Toyota Jidosha Kabushiki Kaisha Emission control apparatus
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JPH11159320A (en) 1997-11-28 1999-06-15 Tokyo Gas Co Ltd Exhaust emission control device for internal combustion engine
EP1281842A2 (en) 2001-07-31 2003-02-05 Toyota Jidosha Kabushiki Kaisha Emission control apparatus
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Publication number Priority date Publication date Assignee Title
KR101028556B1 (en) 2008-12-05 2011-04-11 기아자동차주식회사 System for purifying exhaust gas

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