KR20060038947A - Treatment of nox sorber regeneration gas - Google Patents

Treatment of nox sorber regeneration gas Download PDF

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KR20060038947A
KR20060038947A KR1020057024346A KR20057024346A KR20060038947A KR 20060038947 A KR20060038947 A KR 20060038947A KR 1020057024346 A KR1020057024346 A KR 1020057024346A KR 20057024346 A KR20057024346 A KR 20057024346A KR 20060038947 A KR20060038947 A KR 20060038947A
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South Korea
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engine
sorber
formulation
sorption
exhaust gas
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KR1020057024346A
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Korean (ko)
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아이브 토드 로니 알란손
안데르스 클라스 안드레아손
마츠 라베니우스
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존슨 맛쎄이 퍼블릭 리미티드 컴파니
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Publication of KR20060038947A publication Critical patent/KR20060038947A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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    • 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
    • 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
    • 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
    • B01D53/9481—Catalyst preceded by an adsorption device without catalytic function for temporary storage of contaminants, e.g. during cold start
    • 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
    • B01D53/96—Regeneration, reactivation or recycling of reactants
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    • 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
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    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0231—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 using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
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    • F01N3/0233—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 using means for regenerating the filters, e.g. by burning trapped particles periodically cleaning filter by blowing a gas through the filter in a direction opposite to exhaust flow, e.g. exposing filter to engine air intake
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    • 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
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    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
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    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
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    • 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
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    • 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
    • F01N3/2093—Periodically blowing a gas through the converter, e.g. in a direction opposite to exhaust gas flow or by reversing exhaust gas flow direction
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    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
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    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
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    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
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  • General Chemical & Material Sciences (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
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  • Exhaust Gas After Treatment (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

A method of treating an exhaust gas of a lean-burn reciprocating engine comprises sorbing NOx on at least one NOx sorber (30A; 30B) when the exhaust gas is lean, intermittently contacting the at least one NOx sorber with an agent effective to convert NOx to N2, thereby to regenerate the at least one NOx sorber and feeding effluent of said intermittent contacting step to the engine inlet (14).

Description

ＮＯＸ 수착기 재생 가스의 처리{TREATMENT OF NOX SORBER REGENERATION GAS}Treatment of NOX Sorption Regeneration Gas {TREATMENT OF NOX SORBER REGENERATION GAS}

본 발명은 엔진 배기 가스 중의 NOx의 처리에 관한 것이며, 보다 구체적으로는 린번 왕복 엔진의 배기에서 NOx 수착기 재생 가스의 처리에 관한 것이다.The present invention relates to the treatment of NO x in engine exhaust gas, and more particularly to the treatment of NO x sorber regeneration gas in the exhaust of a lean burn reciprocating engine.

그러한 NOx를 염기성 산화 물질에 수착한 다음, 그 물질을 재생하고, 동시에 NOx를 환원제 또는 NOx 특이적인 반응물로 N2로 전환시킴으로써 제거하는 것이 제시되어 있다. 이 공정은 통상 과량으로 사용되고, 따라서 100% 반응하지 않는 그러한 제제가 대기로 방출되는 것을 제한 또는 회피하는 문제를 앉고 있다.To play the good, then the substance can be such an NO x in a basic oxide material and, at the same time removed by conversion to N 2 in the NO x reducing agent or NO x specific reactant is presented. This process is usually used in excess and thus poses a problem of limiting or avoiding the release of such formulations that are not 100% reactive into the atmosphere.

하기 상세한 설명 및 청구범위에서: 단어 '수착'에 기초한 용어는 '흡수' 또는 '흡착' 또는 그러한 두 공정의 출현을 표현하는 데 사용될 것이며, NOx를 수착하는 데 효과적인 금속 화합물은 '산화물'로 언급되는데, 이 용어는 NOx 흡수제로서 효과적이고, 배기 가스 처리의 조건에 존재하는 수산화물 및 탄산염과 같은 다른 산화성 화합물을 포함하는 것으로 이해해야 한다. In the following detailed description and claims: The term based on the word 'sorption' will be used to express 'absorption' or 'sorption' or the appearance of two such processes, and the metal compound effective for sorption of NO x is referred to as 'oxide'. It is to be understood that this term is effective as a NO x absorbent and includes other oxidizing compounds such as hydroxides and carbonates which are present in the conditions of the exhaust gas treatment.

EP-B-0341832호(본 명세서에서 참고 인용함)에는 디젤 배기 가스 내 미립자 물질을 연소하는 공정이 기재되어 있으며, 상기 방법은 배기 가스 내 일산화질소를 촉매 상에서 이산화질소로 산화시키는 단계, 미립자 물질을 배기 가스로부터 여과하는 단계 및 400℃ 이하에서의 이산화질소 중에서 여과된 미립자 물질을 연소하는 단계를 포함한다. 그러한 시스템은 존슨 맛세이에서 구입할 수 있으며, CRT®로 시판되고 있다. EP-B-0341832 (incorporated herein by reference) describes a process for combusting particulate matter in diesel exhaust gas, the method comprising oxidizing nitrogen monoxide in exhaust gas to nitrogen dioxide on a catalyst, Filtering from the exhaust gas and combusting the filtered particulate material in nitrogen dioxide at 400 ° C. or less. Such systems are available from Johnson Massey and are marketed as CRT®.

NOx 흡수기 재생과 관련된 문제는 환원제로서 미연소 탄화수소(HC) 및 NOx를 함유하는 풍부한 배기 가스의 펄스를 재생하는 것이다. 미반응 HC 및 NOx는 배기관으로부터 방출되고, 종종 연기로서 보일 수 있다. 통상의 NOx 흡수기 재생 전략이 순간적으로 또는 수 분마다 재생하는것을 포함하기 때문에, 그러한 방출은 미립자, HC 및 NOx에 대한 미래의 방출 표준의 부재에 기여할 수 있다. A problem associated with NO x absorber regeneration is the regeneration of pulses of rich exhaust gases containing unburned hydrocarbons (HC) and NO x as reducing agents. Unreacted HC and NO x are released from the exhaust pipe and can often be seen as smoke. Since conventional NO x absorber regeneration strategies include regenerating instantaneously or every few minutes, such releases may contribute to the absence of future emission standards for particulates, HC and NO x .

이제, 본 발명자들은 이 종래 기술의 문제점을 줄이는, 그러한 NOx 흡수기 재생 가스를 처리하기 위한 기술을 개발하였다. Now, the inventors have developed a technique for treating such NO x absorber regeneration gas, which reduces the problems of this prior art.

제1 양태에 따르면, 본 발명은 NOx를 함유하는 린번 왕복 엔진의 배기 가스를 처리하는 방법을 제공하며, 상기 방법은 배기 가스가 희박할 때 1 이상의 NOx 수착기 상에 상기 NOx를 수착하는 단계, 1 이상의 NOx 수착기를, NOx를 NO2로 전환시키는 데 효과적인 제제와 간헐적으로 접촉시켜서 1 이상의 NOx 수착기를 재생하는 단계 및 상기 간헐적 접촉 단계의 유출물을 엔진 입구에 공급하는 단계를 포함한다.According to a first aspect, the present invention provides a method of treating the exhaust gas of a lean burn reciprocating engine containing NO x , wherein the method sorbs the NO x on at least one NO x sorber when the exhaust gas is lean. step, the step of supplying an at least one NO x sorption, the effluent of the step and the intermittent contacting step to thereby having contact with an effective pharmaceutical composition and intermittently to convert NO x to NO 2 reproducing an one or more NO x sorbent to the engine inlet for It includes.

제2 양태에 따르면, NOx를 함유하는 배기 가스를 방출하고, 배기 가스가 희박할 때 NOx를 수착하기 위한 1 이상의 NOx 수착기, 1 이상의 NOx 수착기를, NOx를 N2로 전환시키는 데 효과적인 제제로 간헐적으로 접촉시켜 1 이상의 NOx 수착기를 재생하는 수단 및 상기 접촉 단계의 유출물을 엔진 입구에 공급하는 수단을 포함하는 처리 시스템을 갖춘 린번 왕복 엔진이 제공된다.According to a second aspect, the emission of exhaust gas containing NO x, and the exhaust gas is switched to the lean NO x the number chakhagi least one NO x sorption exchanger, at least one NO x sorption group for, the NO x to N 2 A lean burn reciprocating engine is provided having a treatment system comprising means for intermittently contacting with an agent effective to regenerate one or more NO x sorbers and supplying the effluent of the contacting step to the engine inlet.

엔진은 정상 또는 임시 작동 모드로 배기 가스 순환(EGR)을 위해 장착된 것이 바람직하다. 대안으로, EGR 시스템이 정상적으로 EGR을 사용하는 것이 아닌 엔진에 추가될 수 있다. The engine is preferably equipped for exhaust gas circulation (EGR) in normal or temporary mode of operation. Alternatively, the EGR system can be added to the engine rather than using EGR normally.

유출물을 엔진 입구로 공급하는 것은 그 안에 함유된 제제를 폐기하는 것에 지나지 않기 때문에, 그 유속은 종래의 EGR의 원칙적으로 종래의 EGR의 엔진 내 연소 요건에 관한 것이 아니다. 과량의 EGR없이 유출물의 완전하게 재생하기 위하여, 시스템은 평행하게 배열된 2 이상의 NOx 수착기를 포함하고, 이들 모두를 제제와 접촉시키기 보다는 소수만을 선택적으로 접촉시키는 수단을 포함한다. 재생 하의 NOx 수착기(들) 내 가스의 유속은 바람직하게는 나머지 NOx 수착기(들)에서보다 낮게, 특히 기존의 EGR 시스템에서의 재순환 속도 아래로 더 제한된다. 그러한 시스템은 EGR 펌프를 포함하는 것이 바람직한데, 이는 재순환된 유출물의 유속을 결정한다. Since supplying the effluent to the engine inlet is only a waste of the formulation contained therein, the flow rate is not in principle related to the in-engine combustion requirements of conventional EGR. In order to completely regenerate the effluent without excess EGR, the system includes two or more NO x sorbers arranged in parallel and includes means for selectively contacting only a few rather than contacting all of them with the formulation. The flow rate of the gas in the NO x sorber (s) under regeneration is preferably lower than in the remaining NO x sorber (s), especially below the recycle rate in the existing EGR system. Such a system preferably includes an EGR pump, which determines the flow rate of the recycled effluent.

제제는 NOx 수착기에 진입하려하는 가스로 분사함으로써 용이하게 제공되어 이와 접촉한다. 환원제는 풍부하거나 대략 중성인 공기 연료비, 즉 람다 = 1에서 실린더 전부 보다는 소수, 바람직하게는 하나를 간헐적으로 작동하고, 생성된 배기물을 NOx 수착기(들)에 공급하여 재생시킴으로써 다중 실린더 엔진에 구비된다. The formulation is readily provided and contacted by spraying with a gas that is about to enter the NO x sorber. The reducing agent is a multi-cylinder engine by intermittently operating a small number, preferably one, rather than all of the cylinders at a rich or approximately neutral air fuel ratio, i.e. lambda = 1, and supplying the resulting exhaust to the NO x sorber (s) for regeneration. Is provided.

제제는 NOx 수착기에서의 재생 조건 하에 또는 예비 분사 단계에서 전환될 수 있는, 그 자체로서 분사되거나 또는 화합물(들), 예컨대 엔진 연료로 분사되는, 탄화수소, CO 또는 수소와 같은 비선택성 환원제일 수 있다. 커먼레일 연료 분사 시스템을 가진 엔진에는 NOx 수착기 분사기에 대한 분관이 있을 수 있다. 비선택성 환원제는 실린더의 풍부/중성 작동에 의해 제공된다면 만족스럽게 사용된다.The formulation may be a non-selective reducing agent such as hydrocarbon, CO or hydrogen, which is sprayed on its own or which is injected into the compound (s), such as engine fuel, which can be converted under regeneration conditions in a NO x sorption unit or in a preliminary injection step. Can be. Engines with common rail fuel injection systems may have branch lines for NO x sorber injectors. Non-selective reducing agents are used satisfactorily if provided by the rich / neutral operation of the cylinder.

대안으로, 제제는 아미드와 같은 전구체, 예를 들면 우레아 또는 암모늄 카르바메이트트로 용이하게 제공되고, 가능하게는 유리 수소화물을 발생시키기에 효과적인 촉매를 경유하여 제공되는, NOx 특이적인 환원제, 예를 들면 암모니아 또는 히드라진과 같은 질소 수소화물일 수 있다. Alternatively, the formulations are readily provided with precursors such as amides, for example urea or ammonium carbamate, and possibly via a catalyst effective to generate free hydrides, eg NO x specific reducing agents, eg For example, it may be a nitrogen hydride such as ammonia or hydrazine.

NOx 제거 단계 이외에, 엔진 배기 시스템은 NOx 수착기(들)의 상류에서 HC 및 CO의 증기 및 CO2로의 촉매 산화 및/또는 NO의 NO2로의 촉매 산화; 바람직하게는 촉매 산화의 하류에서의 PM 수집; 및/또는 NOx 수착기(들)의 하류에서 잔류 HC 및 CO의 촉매 산화; NOx 수착기를 통과하거나, 또는 너무 작은 입도 또는 필터 유동 반전에 의한 방출의 결과로서 상류 필터를 통과하는 PM의 수집을 포함할 수 있다. In addition to the NO x removal step, the engine exhaust system comprises catalytic oxidation of HC and CO to CO 2 and / or catalytic oxidation of NO to NO 2 upstream of the NO x sorber (s); PM collection preferably downstream of catalytic oxidation; And / or catalytic oxidation of residual HC and CO downstream of the NO x sorber (s); Collection of PM through the upstream filter as a result of release by the NO x sorber or by too small a particle size or filter flow reversal.

시스템이 PM 수집을 포함하는 경우, 엔진은 상기 PM의 전체 탄소상 분획의 NO에서 NO2로의 산화 후, 연소를 위한 충분한 NOx를 포함하는 원 배기 가스를 방출하도록 설계 및 보정될 수 있다. 대안으로, NO에서 NO2로의 산화 후, 상기 연소를 완결하기에 너무 적은 NOx를 함유하는 원 배기 가스를 적어도 일시적으로 방출하도록 설계될 수 있다. PM 수집 수단은 상기 연소를 촉진하는 데 효과적인 촉매 및 가능하게는 산소 저장 물질도 포함하는 것이 바람직하다. 그러한 연소 과정에서, 온도는 PM이 설계 수준으로 누적된 경우 연속 또는 간격을 둔 NO2 또는, 추가로 산소에 대한 '균형 온도' 이상이다. PM 수집이 필터를 사용하는 경우, 유동 방향의 간헐적 반전을 조건으로 한다. 엔진 제어 시스템은 정상 실행을 위한 매우 희박한(예컨대, a/f = 30), 그러나 산소에 의한 PM의 연소를 위해 온도를 증가시킨 경우 보통으로 희박한(예컨대, a/f = 16) 입구 공기 연료비에서의 작동을 제공한다.If the system includes PM collection, the engine can be designed and calibrated to release raw exhaust gas containing sufficient NO x for combustion after oxidation of NO to NO 2 of the entire carbonaceous fraction of the PM. Alternatively, after oxidation from NO to NO 2 , it can be designed to at least temporarily release the original exhaust gas containing too little NO x to complete the combustion. The PM collection means preferably also comprise a catalyst and possibly an oxygen storage material which are effective for promoting the combustion. In such a combustion process, the temperature is above the 'balance temperature' for continuous or spaced NO 2 or further oxygen when PM has accumulated to the design level. If PM collection uses a filter, it is subject to intermittent inversion of the flow direction. The engine control system is very sparse (e.g. a / f = 30) for normal performance, but usually sparse (e.g. a / f = 16) at inlet air fuel ratios when the temperature is increased for combustion of PM by oxygen. To provide the operation.

통상적으로, NOx 수착제는 다음 중에서 선택된다:Typically, the NO x sorbent is selected from:

(a) 수착 조건에서 적당한 안정성을 가지며, 재생 조건에서 질소 산화물을 방출/반응하는 니트록시염을 형성할 수있는 알칼리, 알칼리토, 희토류 및 전이 금속의 산화물.(a) Oxides of alkali, alkaline earth, rare earth and transition metals having moderate stability in sorption conditions and capable of forming nitrooxy salts which release / react nitrogen oxides under regeneration conditions.

(b) 제올라이트, 탄소 및 고면적 산화물과 같은 흡착성 물질.(b) adsorbent materials such as zeolites, carbon and high area oxides.

어떠한 화합물이 사용되건, NOx와 환원제 또는 NOx 특이적인 반응물의 반응을 촉진하는 데 효과적인 1 이상의 촉매 물질, 예컨대 귀금속, 특히 Pt + Rh가 존재하는 것이 바람직하다. Whichever compound is used, it is preferred that there is at least one catalytic material, such as a noble metal, in particular Pt + Rh, which is effective in promoting the reaction of NO x with a reducing agent or NO x specific reactant.

수착제(들) 및 촉매(들)는 세라믹, 권취 골함석 또는 금속 폼 또는 소결 또는 정렬 또는 랜덤 패킹 와이어 또는 플랫 와이어로 구성된 유통 모놀리식 기재에 적당하게 배치된다. 필터를 사용하는 경우, 수착제 및 필터의 것과 유사한 기재를 사용할 수 있지만, 가스에 투과성이고, PM에 대한 제한된 투과성을 가진 '필터 등급'으로 사용할 수 있다.The sorbent (s) and catalyst (s) are suitably disposed on a flow monolithic substrate composed of ceramic, wound bone iron or metal foam or sintered or aligned or random packed wire or flat wire. When using filters, substrates similar to those of sorbents and filters may be used, but may be used as 'filter grades' that are permeable to gas and have limited permeability to PM.

사용시 및 재생 하에 NOx 수착기(들)로부터 연속적으로 유래하는 가스 유동을 전환하고/하거나 PM 필터에서 유동 방향을 반전하기 위하여, 시스템은 4방향 밸브를 포함하는 것이 적당하다. 통상적으로, 그러한 밸브는 각각 외부 유체 연통을 초래하는 각지게 간격을 둔 장치로 형성된 외부 원통형 또는 절두 원추형 캐스팅; 및 두 개의 유입 스트림을 단일 출구로 향하게 하거나; 또는 단일 스트림을 두 개의 출구 중 어느 하나로 향하게 하거나; 또는 두 개의 유입 스트림을 단일 스트림으로 배합하는 데 효과적인 변류기 수단을 포함한다.In use and under regeneration, the system preferably includes a four-way valve in order to divert the gas flow that is continuously derived from the NO x sorber (s) and / or to reverse the flow direction in the PM filter. Typically, such valves include outer cylindrical or truncated conical castings each formed of an angled device that results in external fluid communication; And directing two inlet streams to a single outlet; Or direct a single stream to either of the two outlets; Or current transformer means effective for combining the two inlet streams into a single stream.

또한, 밸브 수단은 밀봉부를 통하여 작동하는 액츄에이터 수단을 포함한다. 변류기는 선택된 가스 유동이 요구되는, 두 개의 극단 위치 간의 정확한 경로에서 작동할 수 있는 것이 바람직하다. 변류기는 '버터플라이'일 수 있다. 밸브 캐스팅은 버터플라이의 소정의 횡단에 해당하는 더 큰 직경의 벽 영역으로 형성될 수 있으며, 횡단의 극단에서 더 작은 직경으로의 변경은 버터플라이의 프로파일에 정합하고, 가스 누출에 대한 밀봉부로서 효과적인 단계로서 형성된다. 통상적으로, 버터플라이의 횡단은 캐스팅 주변의 10 내지 20%이다. 간헐적인 비선택성 가스 유동이 요구되는 겨우, 액츄에이터 수단이 구비된다.The valve means also comprises actuator means for operating through the seal. The current transformer is preferably capable of operating in the correct path between the two extreme positions where the selected gas flow is desired. The current transformer may be a 'butterfly'. The valve casting may be formed with a larger diameter wall area corresponding to the desired cross section of the butterfly, with the change from the extreme to the smaller cross section of the cross section conforming to the butterfly profile and as a seal against gas leakage. It is formed as an effective step. Typically, the crossing of the butterfly is 10-20% around the casting. Actuator means are provided only if intermittent non-selective gas flow is desired.

변류기 수단은 캐스팅 내에서 유체 조밀하고, 유체 유동의 주 방향에 횡단하는 축에 대하여 회전가능한 배럴 맞춤에 의해 제공되고; 배럴의 2 이상의 방사면 각각을 따라서 1 이상의 유체 조밀한 구동 부재를 형성하며; 배럴의 외주에 대하여 상호 각진 위치에서의 1 이상의 통공이 각 구역에 형성될 수 있고, 상기 위치는 구멍에 해당한다.The current transformer means is provided by barrel fitting fluid tight in the casting and rotatable about an axis transverse to the main direction of the fluid flow; Form at least one fluid dense drive member along each of the at least two radial surfaces of the barrel; One or more openings in mutually angled positions with respect to the outer circumference of the barrel may be formed in each zone, which positions correspond to holes.

배럴(사용되는 경우)은 시트 물질을 통합하여 그 외형 및 내부 통로를 한정하거나, 또는 고체 물질을 성형하고, 그 안으로 천공함으로써 통로를 형성하여, 천공 간의 잔여물이 구동 부재를 구성하도록 하여 제공될 수 있다. 보통, 각각의 통로는 그 내부에 각진, 예를 들면 한 입구 연결부와 둘 또는 세 개의 출구 연결부를 가진 4방향 밸브에 수직으로 각진 출구를 가진다. 두 개의 입구 연결부와 두 개의 출구 연결부를 가진 4 방향 밸브에서, 각각의 통로는 1 개의 입구 및 2 개의 출구를 가질 수 있다.The barrel (if used) may be provided by integrating the sheet material to define its outer and inner passages, or by forming solid passageways and perforating them to form passages so that residues between perforations constitute the drive member. Can be. Usually, each passage has an angled outlet perpendicular to a four-way valve with an angled inside thereof, for example one inlet connection and two or three outlet connections. In a four-way valve with two inlet connections and two outlet connections, each passage may have one inlet and two outlets.

본 발명은 첨부 도면으로 설명하고자 한다.The invention is illustrated by the accompanying drawings.

도 1은 밸브가 두 개의 NOx 수착제 간의 유동 전환을 제공하는 데 사용된 배기가스 처리 시스테을 도시하는 흐름도이다.1 is a flow chart showing an exhaust gas treatment cyste where a valve is used to provide flow divergence between two NO x sorbents.

도 2는 변형예에서 밸브가 PM 필터를 통하여 유동 반전을 제공하는 데 사용되는 배기 가스 처리 시스템을 도시하는 흐름도이다.FIG. 2 is a flow diagram illustrating an exhaust gas treatment system in which a valve is used to provide flow reversal through a PM filter in a variant.

도 3a, 3b 및 3c는 도 1 및 2에 사용된 밸브의 확대 평면도를 도시한다.3A, 3B and 3C show enlarged plan views of the valves used in FIGS. 1 and 2.

도 4a 및 4b는 도 1 및 2에 사용된 밸브의 확대 평면도를 도시한다.4A and 4B show enlarged plan views of the valves used in FIGS. 1 and 2.

도 1을 참조하면, 디젤 엔진(10)에서, 입구 시스템은 연료 공급(12), 공기 공급(14) 및 배기 가스 재순환(EGR) 공급(16)을 포함하고, 배기 가스는 매니폴드(18)를 통하여, 와쉬코트 및 Pt를 담지하는 세라믹 하니콤으로 그성된 산화 촉매(22), 이어서 PM 필터(24)를 함유하는 반응기(20)를 포함하는 배기가스 후처리 시스템(19)으로 나온다. 필터(24)는 필터 등급 세라믹 하니콤으로 구성되는데, 그 통로는 입구 단부에서 교대로 개방 및 폐쇄되고, 입구 개방 통로에 대응하여 출구 단부에서 교대로 폐쇄된다. 이는 매연 산화를 위한 촉매, 예를 들면 Pt 또는 La/Cs/V2O5를 담지할 수 있다. 반응기(20)의 하류 단부는 각각 NOx 수착기(30A 및 30B)로 유도하는 출구(26)를 갖추는데, 수착기 각각은 금속 Pt + Rh 및 산화바륨을 함유하는 알루미나 와쉬코트를 담지하는 세라믹 하니콤 유닛을 보유한다. 수착기(30A,B)는 도시된 바와 같이 분리되어 있는 캔에 구비될 수 있거나, 또는 단일 캔의 유체 조밀한 하위구획에 있을 수 있다. 각각의 수착기(30A,B)에는 엔진(연결부 도시되지 않음)의 커먼레일 시스템으로부터, 또는 암모니아 또는 그것의 전구체의 탄화수소를 위한 분사기(32A,B)가 장착되어 있다.Referring to FIG. 1, in a diesel engine 10, the inlet system includes a fuel supply 12, an air supply 14, and an exhaust gas recirculation (EGR) supply 16, wherein the exhaust gas is a manifold 18. Through, an exhaust gas aftertreatment system 19 comprising an oxidation catalyst 22 formed of a ceramic honeycomb carrying a washcoat and Pt, followed by a reactor 20 containing a PM filter 24. The filter 24 consists of filter grade ceramic honeycomb, the passages of which are open and closed alternately at the inlet end and are alternately closed at the outlet end corresponding to the inlet opening passage. It may carry a catalyst for soot oxidation, for example Pt or La / Cs / V 2 O 5 . The downstream end of the reactor 20 has an outlet 26 leading to NO x sorbers 30A and 30B, respectively, each of which is a ceramic carrying an alumina washcoat containing metal Pt + Rh and barium oxide. Holds a honeycomb unit The sorbers 30A, B may be provided in separate cans as shown, or they may be in a fluid dense subcompartment of a single can. Each sorber 30A, B is equipped with injectors 32A, B for hydrocarbons of ammonia or its precursors, or from the common rail system of the engine (connection not shown).

수착기(30A,B)의 각각의 출구 단부는 4방향 밸브(28)의 두 입구 중 하나에 연결되어 있는데, 그것의 EGR 입구(16)로의 출구(34)(펌프 경유, 도시하지 않음) 및 대기로의 출구(36)는 화살표로 표시한 입구 중 하나 또는 다른 것과 정렬되어 있다. 밸브(28)는 위치(28X, 28Y 및 28Z)(Y 및 Z 삽입도) 사이에서 작동 가능하다. Each outlet end of the sorbers 30A, B is connected to one of the two inlets of the four-way valve 28, its outlet 34 (via pump, not shown) and to its EGR inlet 16; The exit 36 to the atmosphere is aligned with one or the other of the inlets indicated by arrows. The valve 28 is operable between positions 28X, 28Y and 28Z (Y and Z inset).

(주: 밸브의 두 구획은 'LHS', 즉 좌측면 및 'RHS', 즉 우측면으로 언급되지만, 이것은 도면 이해의 편의를 위한 것이며, 실제 구조를 가리키려는 것은 아니다)(Note: The two compartments of the valve are referred to as 'LHS', ie left side and 'RHS', ie right side, but this is for ease of understanding of the drawings and is not intended to point to the actual structure)

위치 X에서, 두 수착기 및 두 출구는 개방되어 있으며: 따라서, 차단된 중간점이 없다.In position X, the two sorbers and the two outlets are open: there is therefore no intermediate point blocked.

위치 Y에서, 수착기(30A)를 이탈하는 가스는 EGR 펌프의 입구 레이팅에서 출구(34)만으로 유동한다. 동일 시점에서, 수착기(30B)로부터 유래하는 가스는 출구(36)를 경유하여 나간다.At position Y, the gas leaving sorber 30A flows only to outlet 34 at the inlet rating of the EGR pump. At the same time, the gas derived from the sorber 30B exits via the outlet 36.

위치 Z에서, 작동은 유사하며, 수착기(30B)의 유출물을 EGR로 공급하고, 수착기(30A)의 유출물은 출구(36)를 경유하여 내보낸다.At position Z, the operation is similar, supplying the effluent of sorber 30B to EGR, and the effluent of sorber 30A is sent out via outlet 36.

엔진의 정상 작동에서, 예를 들면 300℃에서 증기(H2O(g)), 이질소(N2), 산소(O2), 이산화탄소(CO2), 미연소 탄화수소 연료(HC), 일산화탄소(CO), 질소 산화물(NOx) 및 미립자 물질(PM)을 포함하는 배기 가스는 촉매(22)를 접촉하여, NO는 NO2로 산화되고, HC 및 CO의 일부는 증기 및 CO2로 산화된다. 그 다음, 이것은 필터(24)로 진입하여, 대부분의 PM이 수집되고, 촉매(24)에 형성된 NO2와의 반응, 그리고 가능하게는 또한 O2와의 반응에 의하여 연소된다. 그 다음, PM 무함유 가스는 다 음 세 가지 방식 중 하나로 처리된다: 28X: 수착기(30A 및 30B) 각각은 유동하는 전체 가스의 대략 절반으로부터 NOx를 수착하고; 수착기 출구 가스는 주로 대기로 통과하거나, 또는 출구(36)에서 더 처리되고, 부분적으로 EGR 펌프(도시하지 않음)의 유동 레이팅에서 출구(34)에서 EGR로 통과한다; 28Y: 수착기(30A)는 전체 가스 유동 및 또한 분사기(32A)에서 분사된 HC 또는 암모니아의, EGR 펌프 레이팅에 해당하는 분획을 수용한다. 이것은 재생을 수행하고, 그 유출물은 출구(34)에서 EGR로 공급되고; 수착기(30B)는 전체 가스 유동의 대형 분획으로부터 NOx를 수착하고, 그 유출물은 대기로 통과하거나, 출구(36)에서 더 처리된다; 28Z: 수착기(30B 및 30A)는 28Y에서 수행된 임무를 교체한다. 엔진 관리 시스템(도시하지 않음)은 28X에서 28Y로 변경하거나, 또는 수착기가 재생되려 하지 않을 경우 그 역은 실질적으로 NOx로 충전되지만, 재생 기간 중에 전체 가스의 대형 분획을 처리하기에 충분한 NOx 수착 용량을 제어 하에 가진다. In normal operation of the engine, for example, steam (H 2 O (g) ), dinitrogen (N 2 ), oxygen (O 2 ), carbon dioxide (CO 2 ), unburned hydrocarbon fuel (HC), carbon monoxide at 300 ° C. (CO), exhaust gas comprising nitrogen oxides (NO x ) and particulate matter (PM) contact catalyst 22, NO is oxidized to NO 2 , and some of HC and CO are oxidized to steam and CO 2 do. This then enters filter 24 where most of the PM is collected and combusted by reaction with NO 2 formed in catalyst 24, and possibly also with O 2 . The PM-free gas is then treated in one of three ways: 28X: Each of the sorbers 30A and 30B sorbs NO x from approximately half of the total flowing gas; The sorbent outlet gas passes primarily to the atmosphere or is further processed at outlet 36 and partially passes from outlet 34 to EGR in the flow rating of an EGR pump (not shown); 28Y: The sorber 30A receives the total gas flow and also the fraction corresponding to the EGR pump rating of HC or ammonia injected from the injector 32A. This performs regeneration, the effluent being fed to the EGR at outlet 34; Sorber 30B sorbs NO x from a large fraction of the total gas flow and the effluent passes to the atmosphere or is further processed at outlet 36; 28Z: Sorrelers 30B and 30A replace the mission performed at 28Y. The engine management system (not shown) changes from 28X to 28Y, or the reverse is substantially filled with NO x if the sorbent is not going to be regenerated, but NO x sufficient to handle a large fraction of the total gas during the regeneration period. The sorption capacity is under control.

도 2를 참조하면, 도면 번호(10 내지 19)는 도 1과 동일하고, 도식적으로 표시되어 있다. 이제, 반응기(20)는 단지 촉매(22)만을 함유한다. PM 필터(25)는 별도의 용기(21)에 있다. 이것은 필터를 통하는 유동 방향의 역을 제공하는 면에서 상이하다. 반응기(20)의 출구는 위치(23A 및 23B)에서 작동 가능한 단일 입구 반전 밸브(23)에 의하여 필터 용기(21)에 접속되어 필터(25)를 통하여 각각 RH에서 LH 또는 LH에서 RH로의 유동을 제공한다. 어느 한 방향으로 필터(25)를 이탈하면, 가스는 밸브(23A 또는 23B)를 통하여 분기되어 출구(27)로 통과하는데, 이들 각각은 NOx 수착기(30A 또는 30B) 및 4방향 밸브(28)로 유도된다. 밸브(28)의 작동은 도 1과 유사하지만, 대기로의 출구(36)는 필터(40)를 유지하는 용기(38)로의 연결부(37)로 대체되며, 그 임무는 필터(25)로부터 방출된 PM을 수집하는 것이다. 통상적으로, 그러한 PM은 분진이고, 그 경우 필터(40)는 탈착 가능한데, 섬유 또는 페이퍼 필터를 예로 들 수 있다. 필터(40)의 다른 임무는 필터(25)에 의해 수집되지 않은 임의의 초미세 가연성 PM을 수집하는 것일 수 있다.Referring to Fig. 2, reference numerals 10 to 19 are the same as in Fig. 1 and are shown schematically. The reactor 20 now contains only catalyst 22. The PM filter 25 is in a separate container 21. This is different in terms of providing an inverse of the flow direction through the filter. The outlet of the reactor 20 is connected to the filter vessel 21 by a single inlet inversion valve 23 operable at positions 23A and 23B to allow flow through the filter 25 from RH to LH or from LH to RH, respectively. to provide. Upon leaving filter 25 in either direction, gas branches through valve 23A or 23B and passes to outlet 27, each of which is a NO x sorber 30A or 30B and a four-way valve 28. Is induced. The operation of the valve 28 is similar to that of FIG. 1, but the outlet 36 to the atmosphere is replaced by a connection 37 to the vessel 38 holding the filter 40, the task of which is discharged from the filter 25. Collected PM. Typically, such PM is dust, in which case the filter 40 is removable, for example a fiber or paper filter. Another task of the filter 40 may be to collect any ultrafine combustible PMs not collected by the filter 25.

현대 디젤 엔진의 특징은 EP-B-0341832호에 기재되어 있는 바와 같이 엔진 아웃 NOx 및/또는 배기 가스 온도가 NO의 산화에 의해 촉매적으로 발생하는 NO2를 사용하여 패시브 필터 재생을 하기에 너무 낮을 수 있다는 것이다. 이 문제의 한 가지 해결책은 배기 시스템 내 온도를 증가시켜서 필터 상의 PM을 연소시키고, 허용 가능한 설계 공차 내에서 필터를 가로지르는 후압을 유지시킴으로써 필터를 활성적으로 재생하는 것이다. 그러한 활성 재생 기술은, 예를 들면 EP 0758713호(본 명세서에서 참고 인용함)에 기재되어 있다. A characteristic of modern diesel engines is that the passive filter regeneration can be carried out using NO 2 where the engine out NO x and / or exhaust gas temperature is catalytically generated by the oxidation of NO as described in EP-B-0341832. It may be too low. One solution to this problem is to actively regenerate the filter by increasing the temperature in the exhaust system to burn the PM on the filter and maintaining the back pressure across the filter within acceptable design tolerances. Such active regeneration techniques are described, for example, in EP 0758713 (incorporated herein by reference).

CRT® 공정의 실제 적용에 대한 도 2에 개시된 시스템의 이점은 필터 내 유동 반전이 구동 사이클에 걸쳐 NO2에서 즉시 연소되지 않은 PM을 제거하는 데 사용할 수 있다는 것이다. 미연소 PM은 적당한 간격을 제거하기 위한 제2의 일회용 필터 상에 수집될 수 있다. 따라서, 배열은 설치 비용이 고가이고, 연료 비용이 많이 드는 활성 재생 장치의 실제적이고 경제적인 대안을 제공하는, 시장을 갱신하는 특정 용도를 가진다.The advantage of the system disclosed in FIG. 2 for the practical application of the CRT® process is that the flow reversal in the filter can be used to remove PM that did not burn immediately in NO 2 over the drive cycle. Unburned PM can be collected on a second disposable filter to remove a suitable gap. Thus, the arrangement has a particular use to update the market, providing a practical and economical alternative to active regeneration devices which is expensive to install and which is expensive to fuel.

도 3A, 3B 및 3C, 그리고 도 4A 및 4B를 참조하면, 각각의 외부 연결부는 도 1 및 2에서와 동일한 도면 번호를 가진다. 이들 도면에 도시된 평면도는 더 큰 직경의 외주 영역(52)으로 내부적으로 형성된, 본질적으로 원통형인 밸브 캐스팅(50)에 관한 것이며, 밸브 밖으로 밀봉부를 경유하여 액츄에이터(도시하지 않음)로 연장하는 피봇 고정된 작동 샤프트(56)를 갖춘 직사각형 버터플라이 변류기(54)의 횡단 범위를 한정한다. 횡단 범위의 극단은 직경이 상이한 영역 간의 단계(58)에 의해 한정되며, 그러한 단계는 그 소정의 경로 밖으로 가스가 누출되는 것을 제한한다.Referring to Figures 3A, 3B and 3C, and Figures 4A and 4B, each external connection has the same reference numerals as in Figures 1 and 2. The plan views shown in these figures relate to an essentially cylindrical valve casting 50 formed internally with a larger diameter outer circumferential region 52 and pivoting out of the valve to an actuator (not shown) via a seal. It defines the crossing range of the rectangular butterfly current transformer 54 with a fixed working shaft 56. The extreme of the transverse range is defined by step 58 between regions of different diameters, which step limits the outflow of gas out of its predetermined path.

Claims (21)

NOx를 함유하는 린번 왕복 엔진의 배기 가스 처리 방법으로서, 배기 가스가 희박할 때 1 이상의 NOx 수착기(30) 상에 상기 NOx를 수착하는 단계, NOx를 N2로 전환시키는 데 효과적인 제제로 1 이상의 NOx 수착기를 간헐적으로 접촉시킴으로써 1 이상의 NOx 수착기를 재생하는 단계 및 상기 간헐적 접촉 단계의 유출물을 엔진 입구(14)에 공급하는 단계를 포함하는 것을 특징으로 하는 방법.An exhaust gas treatment of lean burn reciprocating engine method containing NO x, when the exhaust gas is lean phase for the sorption of the NO x in the at least one NO x sorption exchanger (30), effective to convert the NO x to N 2 reproducing group one or more NO x sorbent by contacting an at least one NO x sorption intermittently to agents and methods comprising the step of supplying the effluent of said stage intermittent contact with the engine inlet (14). 제1항에 있어서, 희박 배기 가스를 평행 배열된 2 이상의 NOx 수착기(30A, 30B)에 동시에 접촉시키는 단계 및 상기 제제와 동시에 NOx 수착기 전부보다는 소수를 간헐적으로 접촉시키는 단계를 포함하는 것을 특징으로 하는 방법.The method of claim 1 comprising simultaneously contacting the lean exhaust gas to at least two NO x sorbers 30A, 30B arranged in parallel and intermittently contacting a minority of all of the NO x sorbers simultaneously with the formulation. Characterized in that the method. 제2항에 있어서, 재생하고자 하는 각각의 NOx 수착기 내 가스 유동은 재생하지 않을 각각의 NOx 수착기보다 적고, 재생하고자 하는 NOx 수착기(들) 각각의 유출물의 실질적으로 전부는 엔진 입구로 공급되는 것을 특징으로 하는 방법.Each of the NO x sorption-based gas flow is each less than the NO x sorbent group, (s) NO x sorbent which group to play each of the outflow All of the engine substantially in water may not play to be played back, according to 2, wherein Characterized in that it is fed to the inlet. 제1항 내지 제3항 중 어느 한 항에 있어서, 제제는 탄화수소(HC), CO 또는 수소와 같은 비선택성 반응물인 것을 특징으로 하는 방법.The process according to claim 1, wherein the agent is a non-selective reactant such as hydrocarbon (HC), CO or hydrogen. 제4항에 있어서, 제제는 엔진 연료인 것을 특징으로 하는 방법.The method of claim 4, wherein the formulation is an engine fuel. 제1항 내지 제3항 중 어느 한 항에 있어서, 제제는 질소 수소화물인 것을 특징으로 하는 방법.The method of any one of claims 1 to 3, wherein the formulation is nitrogen hydride. 제1항 내지 제6항 중 어느 한 항에 있어서, 각각의 NOx 수착기의 상류에서 HC 및 CO에서 증기(H2O(g)), CO2로 및/또는 NO에서 NO2로의 촉매 산화(22)를 포함하는 것을 특징으로 하는 방법.The catalytic oxidation of any of claims 1 to 6, upstream of each NO x sorber, from HC and CO to steam (H 2 O (g) ), to CO 2 and / or from NO to NO 2 . (22). 제7항에 있어서, NO 산화와 NOx 수착 간에 미립자 물질(PM) 수집(24)을 포함하는 것을 특징으로 하는 방법.8. A method according to claim 7, comprising a particulate matter (PM) collection (24) between NO oxidation and NO x sorption. NOx를 함유하는 배기 가스를 방출하고, 배기 가스가 희박할 때 NOx를 수착하기 위한 1 이상의 NOx 수착기(30), 1 이상의 NOx 수착기를 NOx에서 N2로 전환시키는 데 효과적인 제제와 간헐적으로 접촉시켜서 1 이상의 NOx 수착기를 재생하는 수단(32) 및 상기 접촉의 유출물을 엔진 입구(14)에 공급하는 수단을 포함하는 처리 시스템(19)을 가진 린번 왕복 엔진(10).Effective agents used to discharge the exhaust gas containing NO x, and the exhaust gas is switched to the lean NO x the number of at least one NO x sorption device 30 for chakhagi, an NO x sorption least one to N 2 in the NO x Leanburn reciprocating engine (10) having a processing system (19) comprising means (32) for intermittent contact with said regenerating one or more NO x sorbers and means for supplying an effluent of said contact to an engine inlet (14). 제9항에 있어서, 정상 또는 임시 작동 모드에 사용하기 위한 배기 가스 재순환(EGR) 수단(28, 34, 16)을 포함하고, EGR 수단은 임의로 펌프를 포함하는 것을 특징으로 하는 엔진.10. An engine according to claim 9, comprising exhaust gas recirculation (EGR) means (28, 34, 16) for use in normal or temporary mode of operation, wherein the EGR means optionally comprises a pump. 제9항 또는 제10항에 있어서, 평행 배열된 2 이상의 NOx 수착기(30A, 30B) 및 2 이상의 NOx 수착기 전부보다는 소수를 제제와 선택적으로 접촉시키는 수단을 포함하는 것을 특징으로 하는 엔진.11. An engine according to claim 9 or 10, comprising means for selectively contacting a minority with the formulation rather than all of the at least two NO x sorbers 30A, 30B and at least two NO x sorbers arranged in parallel. . 제11항에 있어서, 1 이상의 NOx 수착기로의 가스 유동을, 그 1 이상의 NOx 수착기의 재생 중에, 재생되지 않는 1 이상의 다른 NOx 수착기에 비하여 감소시키는 수단 및 재생되는 각각의 NOx 수착기의 유출물의 실질적으로 전부를 엔진 입구(14)로 공급하는 수단을 포함하는 것을 특징으로 하는 엔진.The method of claim 11, wherein each of the NO x sorbent is reduced means and reproduction of as compared to the gas flow of at least one NO x sorption group, during the reproduction of the group that at least one NO x sorption, groups one or more of the other NO x sorbent does not play And means for supplying substantially all of the effluent of the machine to the engine inlet (14). 제9항 내지 제12항 중 어느 한 항에 있어서, 각각의 NOx 수착기(30)는 재생 중에 각각의 NOx 수착기(30A, 30B)의 입구에서 제제를 가스에 도입하는 분사 수단(32A, 32B)에 연관되어 있은 것을 특징으로 하는 엔진.13. The injection means 32A according to any one of claims 9 to 12, wherein each NO x sorber 30 introduces a formulation into the gas at the inlet of each NO x sorber 30A, 30B during regeneration. , 32B). 제9항 내지 제13항 중 어느 한 항에 있어서, 제제의 공급을 포함하는 것을 특징으로 하는 엔진.14. An engine according to any one of claims 9 to 13, comprising supplying a formulation. 제14항에 있어서, 제제는 탄화수소(HC), CO 또는 수소와 같은 비선택성 환원제인 것을 특징으로 하는 엔진.The engine of claim 14, wherein the formulation is a non-selective reducing agent such as hydrocarbon (HC), CO or hydrogen. 제15항에 있어서, 제제는 엔진 연료인 것을 특징으로 하는 엔진.The engine of claim 15, wherein the formulation is an engine fuel. 제13항에 있어서, 각각의 NOx 수착기 분사기(30A, 30B)로 분기되는 커먼레일 연료 분사(12) 시스템을 포함하는 것을 특징으로 하는 엔진.14. An engine according to claim 13, comprising a common rail fuel injection (12) system branched to each NO x sorber injector (30A, 30B). 제14항에 있어서, 제제는 질소 수소화물인 것을 특징으로 하는 엔진.The engine of claim 14, wherein the formulation is nitrogen hydride. 제9항 내지 제18항 중 어느 한 항에 있어서, 사용시 1 이상의 NOx 수착기(30)의 간헐적 재생 및 각각의 NOx 수착기 재생의 유출물의 엔진 입구(14)로의 공급을 제어하는 수단을 포함함으로써, NOx 수착기 재생 유출물을 엔진 입구에 공급하는 수단이 없는 유사한 엔진에 비하여 대기로 방출되는 재생 제제의 양을 감소시키는 것을 특징으로 하는 엔진.19. The device according to any one of claims 9 to 18, wherein the means for controlling the supply of effluent to the engine inlet 14 of the intermittent regeneration of at least one NO x sorber 30 and each NO x sorber regeneration in use. Thereby reducing the amount of regeneration formulation released to the atmosphere as compared to a similar engine without means for supplying NO x sorber regeneration effluent to the engine inlet. 제9항 내지 제19항 중 어느 한 항에 있어서, 상기 시스템은 HC 및 CO에서 증기 및 CO2로 및/또는 NO에서 NO2로의 산화를 촉매 작용하기 위한, 각각의 NOx 수착기의 상류에 배치된 산화 촉매(22)를 포함하는 것을 특징으로 하는 엔진.The system of claim 9, wherein the system is located upstream of each NO x sorber for catalyzing oxidation of HC and CO to steam and CO 2 and / or NO to NO 2 . An engine comprising an oxidation catalyst (22) disposed. 제20항에 있어서, 시스템은 NO 산화 촉매(20)와 각각의 NOx 수착기(30) 사이에 위치한 미립자 물질(PM) 필터(24)를 포함하는 것을 특징으로 하는 엔진.The engine of claim 20, wherein the system comprises a particulate matter (PM) filter (24) located between the NO oxidation catalyst (20) and each NO x sorber (30).
KR1020057024346A 2003-06-18 2004-06-18 Treatment of nox sorber regeneration gas KR20060038947A (en)

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