JP2012525540A - Diesel aftertreatment system - Google Patents

Diesel aftertreatment system Download PDF

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JP2012525540A
JP2012525540A JP2012508583A JP2012508583A JP2012525540A JP 2012525540 A JP2012525540 A JP 2012525540A JP 2012508583 A JP2012508583 A JP 2012508583A JP 2012508583 A JP2012508583 A JP 2012508583A JP 2012525540 A JP2012525540 A JP 2012525540A
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exhaust
step
diesel
system
burner
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エイ イェトキン、デービス
ガードナー、ティモシー
グンドーガン、アルダ
コトルバ、アダム、ジェイ.
ジャクソン、ティモシー、イー.
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テネコ オートモティブ オペレーティング カンパニー インコーポレイテッドTenneco Automotive Operating Company Inc.
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Priority to US12/430,194 priority Critical patent/US20100269492A1/en
Priority to US12/430,194 priority
Application filed by テネコ オートモティブ オペレーティング カンパニー インコーポレイテッドTenneco Automotive Operating Company Inc. filed Critical テネコ オートモティブ オペレーティング カンパニー インコーポレイテッドTenneco Automotive Operating Company Inc.
Priority to PCT/US2010/032522 priority patent/WO2010126870A1/en
Publication of JP2012525540A publication Critical patent/JP2012525540A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/023Exhaust 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
    • F01N3/0231Exhaust 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]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/009Exhaust 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/023Exhaust 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
    • F01N3/025Exhaust 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 fuel burner or by adding fuel to exhaust
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/033Exhaust 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
    • F01N3/035Exhaust 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828Exhaust 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
    • F01N3/0842Nitrogen oxides
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/105General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106Auxiliary oxidation catalysts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/18Exhaust 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
    • F01N3/20Exhaust 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
    • F01N3/2066Selective catalytic reduction [SCR]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/14Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel burner
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/02Adding substances to exhaust gases the substance being ammonia or urea
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/03Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/04Adding substances to exhaust gases the substance being hydrogen
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/20Exhaust after-treatment
    • Y02T10/24Selective Catalytic Reactors for reduction in oxygen rich atmosphere

Abstract

ディーゼル圧縮エンジン(16)などのディーゼル燃焼プロセス(14)からの排気(12)を処理するディーゼル排気ガス後処理システム(10)が提供される。 Diesel exhaust aftertreatment system for treating exhaust (12) from a diesel combustion process, such as a diesel compression engine (16) (14) (10) is provided. システム(10)は、排気(12)を高温でシステム(10)の残り部分に選択的に供給するバーナ(18)と、バーナ(18)から排気(12)を受け取るようにバーナ(18)の下流に接続されたディーゼル微粒子フィルタ(20)と、フィルタ(20)から排気を受け取るようにフィルタ(20)の下流に接続されたNO 還元装置(22)とを含む。 System (10), and exhaust (12) selectively supplying the burner to the rest of the system (10) at elevated temperature (18), a burner to receive the exhaust (12) from the burner (18) (18) including a diesel particulate filter connected downstream (20), NO x reduction device connected downstream of the filter the filter to receive the exhaust from (20) (20) and (22).

Description

本発明は、ディーゼル圧縮エンジンなどのディーゼル燃焼プロセスからの排気ガスを処理するシステム及び方法に関し、より詳細には、ディーゼル圧縮エンジンからの窒素酸化物(NO )及び放出粒子状物質(PM)を還元するシステムに関する。 The present invention relates to a system and method for treating exhaust gases from a diesel combustion process, such as a diesel compression engine, and more particularly, nitrogen oxides from diesel compression engine (NO x) and releasing particulate matter (PM) It relates to a system for reduction.

環境規制は、ディーゼル燃焼プロセスから、特にディーゼル圧縮エンジンからのNO 及びPMの還元を必要とする放出限界を増大させることを求めてきた。 Environmental regulations, diesel combustion process, have been particularly sought to increase the release limit that requires reduction of the NO x and PM from diesel compression engine. ディーゼル微粒子フィルタ(DPF)は、通常、すすの形の炭素質微粒子であるPMの必要な還元を実現することが可能であるが、DPFによって提供される粒子状物質の還元とともにNO の必要な還元を提供できる改善されたシステムが引き続き必要とされている。 Diesel particulate filter (DPF) may usually be able to achieve the necessary reduction of the PM is carbonaceous particulate in the form of soot, required of the NO x with reducing the particulate matter provided by the DPF improved system can provide a reduction there is a continuing need.

この点に関して、DPF内で収集されたすすと反応してDPFの所望の再生(受動的再生と呼ばれることが多い)をもたらす排気内のNO のレベルを増大させるために、DPFの上流にディーゼル酸化触媒(DOC)を提供するシステムが提案されてきた。 In this regard, in order to increase the level of NO 2 in the exhaust lead to react with soot collected in the DPF desired reproduction of the DPF (often referred to as passive regeneration), diesel upstream of DPF system providing an oxidation catalyst (DOC) have been proposed. しかし、そのようなシステムは、300℃未満の温度に制限されるようになり、通常、酸化触媒の前後で圧力降下をもたらす。 However, such a system is now limited to a temperature below 300 ° C., usually results in a pressure drop before and after the oxidation catalyst. この圧力降下は、システムの残り部分の設計で補償しなければならない。 This pressure drop must be compensated for in the design of the rest of the system. 加えて、水素又は炭化水素燃料などの燃料をDOCの上流に送達して、DPF内で315.6℃(600°F)より大きい温度を生成することができる(能動的再生と呼ばれることが多い)。 In addition, a fuel such as hydrogen or a hydrocarbon fuel is delivered upstream of the DOC, are often referred to as the 315.6 ° C. can generate (600 ° F) greater than the temperature (active regeneration in DPF ).

本発明の1つの特徴によれば、ディーゼル燃焼プロセスからの排気を処理するディーゼル排気ガス処理システムが提供される。 According to one aspect of the present invention, a diesel exhaust gas treatment system for treating exhaust from a diesel combustion process is provided. このシステムは、排気を受け取り、排気を火炎で選択的に加熱して、排気を高温でシステムの残り部分に供給するバーナと、バーナから排気を受け取るようにバーナの下流に接続されたディーゼル微粒子フィルタ(DPF)と、ディーゼル微粒子フィルタから排気を受け取るようにディーゼル微粒子フィルタの下流に接続された選択的接触還元触媒(SCR)及びNO トラップのうちの少なくとも1つとを含む。 The system receives exhaust, by selectively heating the exhaust flame, and burner supplies the rest of the system the exhaust at high temperatures, diesel particulate filters connected from the burner to the downstream of the burner to receive exhaust It includes a (DPF), at least one of a diesel particulate selective catalytic reduction catalyst connected downstream of the diesel particulate filter to receive the exhaust from the filter (SCR) and NO x traps.

1つの特徴として、システムは、バーナから排気を受け取るようにバーナの下流で、DPFへ排気を送達するようにDPFの上流に接続されたディーゼル酸化触媒をさらに含む。 In one aspect, the system downstream of the burner to receive exhaust from the burner, further comprising a diesel oxidation catalyst which is connected upstream of the DPF to deliver exhaust to the DPF. さらなる特徴では、システムは、バーナの下流でDOCの上流に位置する燃料インジェクタをさらに含む。 In a further feature, the system further includes a fuel injector located upstream of the DOC downstream of the burner.

1つの特徴では、システムは、DPFから排気を受け取るようにDPFの下流で、SCRへ排気を送達するようにSCRの上流に接続されたディーゼル酸化触媒をさらに含む。 In one aspect, the system, downstream of the DPF to receive exhaust from the DPF, further comprising a diesel oxidation catalyst connected upstream of the SCR to deliver exhaust to SCR.

1つの特徴によれば、バーナは、少なくとも1つの燃料インジェクタ及び少なくとも1つの点火装置を含む。 According to one feature, the burner comprises at least one fuel injector and at least one ignition device.

1つの特徴として、前記「選択的接触還元触媒及びNO トラップのうちの少なくとも1つ」が選択的接触還元触媒であり、触媒の上流に接続された還元剤インジェクタをさらに含む。 In one aspect, the "at least one of the selective catalytic reduction catalyst and NO x trap" is a selective catalytic reduction catalyst further comprises a reducing agent injector which is connected upstream of the catalyst.

本発明の1つの特徴によれば、ディーゼル燃焼プロセスからのディーゼル排気を処理する方法が提供される。 According to one aspect of the present invention, a method for treating diesel exhaust from diesel combustion process is provided. この方法は、 This method,

(a)ディーゼル燃焼プロセスの下流で排気流内の燃料を燃焼させることによって、排気の温度を選択的に増大させるステップと、 (A) by combusting the fuel in the exhaust stream downstream of the diesel combustion process, and increasing the temperature of the exhaust selectively,

(b)ステップ(a)から提供される温度を増大させた排気中に炭素を酸化させることによって、フィルタからすすを除去するステップと、 By oxidizing carbon (b) from step (a) in the exhaust gas increased the temperature to be provided, removing the soot from the filter,

(c)ステップ(b)から提供される排気内で保持されるNO を除去するステップとを含む。 And removing the NO x held in the exhaust provided by the (c) step (b).

1つの特徴では、前記方法は、ステップ(b)の前に、ステップ(a)からの排気を酸化触媒に通すことによって、NO を生じさせるステップをさらに含む。 In one aspect, the method, prior to step (b), by passing the exhaust gas from step (a) the oxidation catalyst further comprises the step of causing the NO 2. さらなる特徴として、前記方法は、ステップ(a)の後でステップ(b)の前に、排気内へ燃料を噴射するステップをさらに含む。 As a further feature, the method comprises prior to step (b) after step (a), further comprising the step of injecting fuel into the exhaust.

さらなる特徴では、前記方法は、ステップ(c)の前に、ステップ(b)からの排気を酸化触媒に通すことによって、NO を生じさせるステップをさらに含む。 In a further aspect, the method, before step (c), by passing the exhaust gas from step (b) to the oxidation catalyst further comprises the step of causing the NO 2.

1つの特徴によれば、前記ステップ(a)は、排気内へ燃料を噴射するステップと、燃料に着火するステップとを含む。 According to one feature, the step (a) includes the steps of injecting fuel into the exhaust, and a step of igniting the fuel.

1つの特徴として、前記ステップ(c)は、排気を選択的接触還元触媒に通すことによって、NO をN に変換するステップを含む。 In one aspect, the step (c), by passing the exhaust into selective catalytic reduction catalyst, comprising the steps of converting the NO x to N 2.

1つの特徴では、前記ステップ(c)は、NO を捕集するステップを含む。 In one aspect, the step (c) includes the step of collecting the NO x.

本発明の他の目的、特徴、及び利点は、添付の特許請求の範囲及び図面を含めて、本明細書全体を読めば、明らかになるであろう。 Other objects, features, and advantages of the present invention, including the claims and drawings appended hereto, a reading of the entire specification, will be apparent.

本発明を実施するディーゼル排気ガス処理システムを、ディーゼル燃焼エンジンとともに示す図である。 The diesel exhaust gas treatment system embodying the present invention, illustrating with a diesel combustion engine. 図1に類似しているが、ディーゼル排気ガス処理システムの代替実施例を示す図である。 It is similar to Figure 1 showing an alternative embodiment of a diesel exhaust gas treatment system. 図1に類似しているが、ディーゼル排気ガス処理システムの代替実施例を示す図である。 It is similar to Figure 1 showing an alternative embodiment of a diesel exhaust gas treatment system. 図1に類似しているが、ディーゼル排気ガス処理システムの代替実施例を示す図である。 It is similar to Figure 1 showing an alternative embodiment of a diesel exhaust gas treatment system.

ディーゼル圧縮エンジン16などのディーゼル燃焼プロセス14からの排気12を処理するディーゼル排気ガス後処理システム10が提供される。 Diesel exhaust aftertreatment system 10 for treating exhaust 12 from a diesel combustion process 14, such as a diesel compression engine 16 is provided. 排気12は通常、とりわけ一酸化窒素(NO)及び二酸化窒素(NO )などの窒素酸化物(NO )、粒状物質(PM)、炭化水素、一酸化炭素(CO)、並びに他の燃焼副生成物を含有する。 Exhaust 12 typically inter alia nitric oxide (NO) and nitrogen dioxide (NO 2) nitrogen oxides, such as (NO x), particulate matter (PM), hydrocarbons, carbon monoxide (CO), and other combustion by- containing the product.

システム10は、排気12を高温でシステム10の残り部分に選択的に供給するバーナ18と、バーナ18から排気12を受け取るようにバーナ18の下流に接続されたディーゼル微粒子フィルタ(DPF)20と、DPF20から排気12を受け取るようにDPF20の下流に接続された、図1に示す選択的接触還元触媒(SCR)24又は図2に示す希薄NOxトラップ26などのNO 還元装置22とを含む。 System 10 includes a selectively supplies the burner 18 exhaust 12 at a high temperature to the rest of the system 10, a diesel particulate filter (DPF) 20 which is connected downstream of the burner 18 to receive exhaust 12 from the burner 18, from DPF 20 to receive the exhaust 12 is connected downstream of the DPF 20, and a the NO x reduction device 22 such as a selective catalytic reduction catalyst (SCR) 24, or lean NOx trap 26 shown in FIG. 2 shown in FIG. ディーゼル圧縮エンジン16などの希薄燃焼エンジンの排気12内で動作温度がより低いことを克服するために、DPF20向けの能動的再生プロセスが用いられる。 For operating temperatures in the exhaust 12 within the lean burn engine such as a diesel compression engine 16 to overcome the lower, active regeneration process for DPF20 it is used. 能動的再生プロセスでは、バーナ18内で燃料を着火して火炎28を生じさせ、排気12を高温に加熱し、それによってDPF20内でPMの酸化を可能にする。 The active regeneration process, to ignite the fuel causing flame 28 within the burner 18, to heat the exhaust 12 to the hot, thereby allowing the oxidation of PM in the DPF 20. 加えて、そのような能動的再生とともに、又は能動的再生とは無関係に、バーナ18を同様に使用して排気12を高温に加熱し、それによってSCR24の変換効率を高めることができる。 In addition, with such active regeneration, or independently of the active regeneration, the burner 18 is used as well to heat the exhaust 12 to the hot, thereby increasing the conversion efficiency of SCR24. 有利には、バーナ18は、エンジン16を出ると排気12内で低温(300℃未満)をもたらす動作状態を含めて、あらゆる特定のエンジン動作状態とは無関係に、選択的に又は連続してそのような高温を提供できる。 Advantageously, the burner 18, including an operating state resulting in a low temperature (below 300 ° C.) and exits the engine 16 in the exhaust 12 within, regardless of the any particular engine operating conditions, selectively or sequentially the it is possible to provide a high temperature, such as. したがって、システム10は、エンジン制御部の調整を必要とすることなく動作することができる。 Accordingly, the system 10 can operate without the need for adjustment of the engine control unit.

バーナ18は、好適に、2つの例が水素及び炭化水素である適切な燃料を噴射する1つ又は複数のインジェクタ30と、スパーク・プラグ32などの1つ又は複数の点火装置によって排気内にすでに保持された燃焼していない燃料と共に点火される空気などの酸素供給物質を含む。 Burner 18, preferably, the one or more injectors 30 which two examples injects suitable fuel is hydrogen and hydrocarbons, already in the exhaust by one or more ignition devices, such as a spark plug 32 is ignited with the fuel it has not been retained combusted containing oxygenate, such as air. この点に関して、各インジェクタ30は、燃料と酸素供給物質の両方を噴射する複合インジェクタ、又は燃料若しくは酸素供給物質のうちの1つに特有のインジェクタとすることができる。 In this regard, each injector 30 may be a specific injector to one of the composite injector, or fuel or oxygenate for injecting both fuel and oxygenate. 任意の適切な処理装置(複数可)、センサ、流れ制御弁、電気コイルなどを使用してインジェクタ30を通る流れ及び点火装置32による着火を監視及び制御する制御システムが提供されることが好ましい。 Any suitable processing device (s), sensor, flow control valves, that using an electric coil control system for monitoring and controlling the ignition due to the flow and the ignition device 32 through the injector 30 is provided is preferable. この制御システムを、概略的に34で示す。 The control system, shown schematically at 34.

DPF20は、任意の適切な構造又はタイプのものとすることができ、その多くが知られている。 DPF20 may be of any suitable construction or type, many of which are known.

SCR24には、任意の適切な触媒を利用することができ、触媒の例には、任意の適切な構造又はタイプの銅ベース、鉄ベース、及びバナジアベースの触媒が含まれる。 The SCR24, can utilize any suitable catalyst, examples of catalysts include any suitable structure or types of copper-based, include iron-based, and Banajiabesu catalyst. システム10はまた、還元剤インジェクタ36を含むことが好ましい。 System 10 also preferably includes a reducing agent injector 36. 還元剤インジェクタ36は、この場合も任意の適切な構造及びタイプのものであり、アンモニア、尿素、炭化水素、水素、又は合成ガスなどの窒素還元剤を排気12内へ導入して、排気12内のNO 分を、好ましくは少なくとも25%、また適正な状態下では99%も還元することができる。 The reducing agent injector 36 is in this case be of any suitable construction and type are also ammonia, urea, hydrocarbons, hydrogen, or a nitrogen reducing agent, such as synthesis gas is introduced into the exhaust 12, exhaust 12 the of the NO x content, preferably at least 25%, and under proper conditions can also be reduced 99%. この点に関して、SCR内の温度は、使用される還元剤のタイプに大きく依存する。 In this regard, the temperature of the SCR is highly dependent on the type of reducing agent used. インジェクタ36は、加圧された還元剤源(図示せず)によって供給され、制御装置34又は別個の制御装置(図示せず)によって制御される。 The injector 36 is supplied by a pressurized source of reducing agent (not shown), it is controlled by the controller 34 or a separate controller (not shown).

図2を参照すると、任意の適切な構造及びタイプの希薄NOxトラップ26を利用することができ、希薄NOxトラップ26は、有利には、希薄な燃料と空気の混合物を利用する動作状態中にNO を蓄積し、豊富な燃料と空気の混合物を利用する動作状態下で、蓄積されたNO をN 及びO に還元する。 Referring to FIG. 2, it is possible to use any suitable construction and type of lean NOx trap 26, a lean NOx trap 26 is advantageously, NO in operation state utilizing a mixture of lean fuel and air 2 was accumulated rich fuel and mixture under operating conditions utilized in the air, reducing the accumulated NO 2 to N 2 and O 2. この点に関して、好ましくはないが必要に応じて、予備の炭化水素燃料をトラップ26の上流で噴射して、トラップ26内で豊富な燃料と空気の状態をもたらし、蓄積されたNO からN 、H O、及びCO を形成するのを助けることができる。 In this regard, although not preferred, if necessary by injecting extra hydrocarbon fuel upstream of the trap 26, resulted in a state of enriched fuel and air in the trap 26, from the stored NO 2 N 2 , it can help to form H 2 O, and CO 2.

動作の際には、DPFの圧力降下、DPFのすすの質量、所定の動作時間設定点、及び燃料消費率などの複数のパラメータ又はパラメータの組合せに基づいて、システム10によるDPF20の能動的再生が必要かどうかを決定することができる。 In operation, pressure drop DPF, the mass of soot DPF, the predetermined operating time set point, and based on a combination of a plurality of parameters or parameter such as fuel consumption rate, the active regeneration of the DPF20 by system 10 it is possible to determine whether you need. 同様に、DPFの圧力降下、DPFのすすの質量、及び所定の再生時間設定点などの複数のパラメータ又はパラメータの組合せに基づいて、DPF20の能動的再生を終了させることができる。 Similarly, the pressure drop across the DPF, based on a combination of a plurality of parameters or parameter of the mass of soot DPF, and the like predetermined playback time setpoint can terminate active regeneration of DPF 20. 能動的再生中、インジェクタ(複数可)30を介する燃料及び空気の噴射は、排気12の流量、排気12内の酸素濃度、並びにDPF20への排気12の入口温度及びDPF20からの排気12の出口温度を含めて、複数のパラメータ又はパラメータの組合せに基づいて行うことができ、点火装置のイオン化検出によって、又はバーナ18への排気12の入口温度とバーナ18からの排気12の出口温度を比較することによって、火炎の安定性が監視される。 During active regeneration, the injection of fuel and air through the injector (s) 30, the flow rate of the exhaust 12, the oxygen concentration in the exhaust 12, and the outlet temperature of the exhaust 12 from the inlet temperature and the DPF20 the exhaust 12 to the DPF20 including, can be based on a combination of a plurality of parameters or parameter, by ionization detection of the ignition device, or by comparing the outlet temperature of the exhaust 12 from the inlet temperature and burner 18 of the exhaust 12 to the burner 18 Accordingly, the stability of the flame is monitored.

SCR24及び/又は希薄NOxトラップ26に対応する適切なパラメータを利用する類似の制御方式を利用して、バーナ18の能動的な使用を提供し、性能を改善し、及び/又は再生を提供することができる。 SCR24 and / or by utilizing a similar control system using the appropriate parameters corresponding to the lean NOx trap 26, to provide an active use of the burner 18, to improve performance, and / or to provide a reproduction can.

システム10では、DPFの適切な再生を得るにはエンジン又はシステム内への過度の燃料噴射を必要とする公知の後処理システムと比較すると、燃料効率を高めることができることを理解されたい。 In the system 10, like in order to obtain adequate regeneration of the DPF when compared to known post-treatment systems requiring excessive fuel injection into the engine or system, it is to be understood that it is possible to improve the fuel efficiency. バーナ18は、特にDPFの受動的再生に十分なNO を提供するために排気をDPFの上流でDOCに通すことによる受動的又は能動的再生に依拠するシステムと比較すると、バーナ18を通る排気12内で圧力降下を比較的低くするように設計できることも理解されたい。 Burner 18, as compared with systems that rely on passive or active regeneration by passing the DOC exhaust upstream of the DPF in order to provide sufficient NO 2 especially passive regeneration of the DPF, the exhaust gas passing through the burner 18 it is also to be understood that can be designed to a relatively low pressure drop in the 12. 排気12をSCR24の上流でDPF20に通すことで、SCR24内の熱変動を抑える傾向があり、それによって還元剤噴射の制御を簡略化できることをさらに理解されたい。 The exhaust 12 is passed through the DPF20 upstream of SCR24, tend to suppress the thermal fluctuation of the SCR24, It is further understood that simplifies the control of the reducing agent injection thereby.

図3を参照すると、システム10の代替実施例が示されている。 Referring to FIG. 3, an alternative embodiment of the system 10 is shown. この代替実施例では、バーナ18とDPF20の間にDOC40が接続され、受動的再生に好ましい動作状態中のあるレベルで、排気12内にNO を提供してDPF20の受動的再生を行う。 In this alternative embodiment, DOC 40 is connected between the burner 18 and the DPF 20, at a level of in preferred operating states passive regeneration, provides a NO 2 performs passive regeneration of DPF 20 in the exhaust 12. これにより、バーナ18による能動的再生の必要を低減させることができ、それによってシステム10の全体的な燃料効率を増大させることができる。 This can reduce the need for active regeneration by the burner 18, thereby increasing the overall fuel efficiency of the system 10.

図4は、図3に類似しているが、DPF20とSCR24の間にさらに別のDOC42を追加して追加のNO を提供し、SCR24内の反応を最適化するシステム10のさらに別の実施例を示す。 Figure 4 is similar to FIG. 3, to provide a DPF20 Add NO 2 further add another DOC42 during SCR24, yet another embodiment of a system 10 for optimizing the reaction of the SCR24 It shows an example. システム10に対するさらなる代替手段として、バーナ18とDOC40の間に燃料インジェクタ44が追加され、燃料インジェクタ44は2つの例が炭化水素燃料及び水素である追加燃料を選択的に提供してDOC40内の反応を高め、特定の動作状態下で排気内に追加の量のNO を生じさせる。 As a further alternative to the system 10, the fuel injector 44 is added between the burner 18 and the DOC 40, the fuel injector 44 is selectively provided to the reaction in the DOC 40 additional fuel Two examples are a hydrocarbon fuel and hydrogen enhanced, causing NO 2 additional amounts in the exhaust under certain operating conditions.

Claims (13)

  1. ディーゼル燃焼プロセスからの排気を処理するディーゼル排気ガス処理システムであって、 A diesel exhaust gas treatment system for treating exhaust from a diesel combustion process,
    前記排気を受け取り、前記排気を火炎で選択的に加熱して、前記排気を高温で前記システムの残り部分に供給するバーナと、 Receiving said exhaust, the exhaust is selectively heated by a flame, and the burner is supplied to the rest of the system the exhaust at a high temperature,
    前記バーナから前記排気を受け取るように前記バーナの下流に接続されたディーゼル微粒子フィルタと、 A diesel particulate filter connected downstream of the burner to receive the exhaust from the burner,
    前記ディーゼル微粒子フィルタから前記排気を受け取るように前記ディーゼル微粒子フィルタの下流に接続された選択的接触還元触媒及びNO トラップのうちの少なくとも1つとを備える、システム。 Wherein at least one comprises a system of said diesel particulate selective catalytic reduction catalyst connected downstream of the filter and NO x trap as a diesel particulate filter receives the exhaust.
  2. 前記バーナから前記排気を受け取るように前記バーナの下流で、前記ディーゼル微粒子フィルタへ前記排気を送達するように前記ディーゼル微粒子フィルタの上流に接続されたディーゼル酸化触媒をさらに備える、請求項1に記載のシステム。 Downstream of the burner to receive the exhaust from the burner, further comprising a diesel oxidation catalyst, wherein connected upstream of the diesel particulate filter to deliver the exhaust to the diesel particulate filter of claim 1 system.
  3. 前記ディーゼル微粒子フィルタから前記排気を受け取るように前記ディーゼル微粒子フィルタの下流で、前記選択的接触還元触媒へ前記排気を送達するように前記選択的接触還元触媒の上流に接続されたディーゼル酸化触媒をさらに備える、請求項2に記載のシステム。 The diesel from particulate filter downstream of the diesel particulate filter to receive the exhaust, further the diesel oxidation catalyst connected upstream of the selective catalytic reduction catalyst to deliver the exhaust to the selective catalytic reduction catalyst comprising a system according to claim 2.
  4. 前記バーナの下流で前記ディーゼル酸化触媒の上流に位置する燃料インジェクタをさらに備える、請求項2に記載のシステム。 Further comprising a fuel injector located upstream of the diesel oxidation catalyst downstream of the burner system of claim 2.
  5. 前記バーナが、少なくとも1つの燃料インジェクタ及び少なくとも1つの点火装置を備える、請求項1に記載のシステム。 The burner comprises at least one fuel injector and at least one ignition device, according to claim 1 system.
  6. 選択的接触還元触媒及びNO トラップのうちの前記少なくとも1つが選択的接触還元触媒であり、前記触媒の上流に接続された還元剤インジェクタをさらに備える、請求項1に記載のシステム。 Wherein at least one of a selective catalytic reduction catalyst, further comprising the connected reductant injector upstream of the catalyst system of claim 1 of the selective catalytic reduction catalyst and NO x trap.
  7. ディーゼル燃焼プロセスからのディーゼル排気を処理する方法であって、 A method for treating diesel exhaust from a diesel combustion process,
    (a)前記ディーゼル燃焼プロセスの下流で前記排気流内の燃料を燃焼させることによって、前記排気の温度を選択的に増大させるステップと、 (A) by combusting the fuel in the exhaust stream downstream of the diesel combustion process, comprising the steps of selectively increasing the temperature of the exhaust,
    (b)ステップ(a)から提供される前記温度を増大させた排気中に炭素を酸化させることによって、フィルタからすすを除去するステップと、 (B) by oxidizing carbon from step (a) in the exhaust gas increased the temperature to be provided, removing the soot from the filter,
    (c)ステップ(b)から提供される前記排気内に保持されるNO を除去するステップとを含む、方法。 (C) Step (b) it is provided from and removing the NO x to be retained in the exhaust method.
  8. 前記ステップ(b)の前に、前記ステップ(a)からの前記排気を酸化触媒に通すことによって、NO を生じさせるステップをさらに含む、請求項7に記載の方法。 Prior to the step (b), by passing the oxidation catalyst to the exhaust from the step (a), further comprising the step of causing NO 2, The method of claim 7.
  9. 前記ステップ(c)の前に、前記ステップ(b)からの前記排気を酸化触媒に通すことによって、NO を生じさせるステップをさらに含む、請求項8に記載の方法。 Prior to the step (c), by passing the oxidation catalyst to the exhaust from said step (b), further comprising the step of causing NO 2, The method of claim 8.
  10. 前記ステップ(a)の後及び前記ステップ(b)の前に、前記排気内へ燃料を噴射するステップをさらに含む、請求項8に記載の方法。 Before said and said step after step (a) (b), further comprising the step of injecting fuel into said exhaust method of claim 8.
  11. 前記ステップ(a)が、前記排気内へ燃料を噴射するステップと、前記燃料に着火するステップとを含む、請求項7に記載の方法。 Wherein step (a) includes the steps of injecting fuel into said exhaust, a step of igniting the fuel, the method according to claim 7.
  12. 前記ステップ(c)が、前記排気を選択的接触還元触媒に通すことによって、NO をN に変換するステップを含む、請求項7に記載の方法。 Wherein step (c), by passing the exhaust into selective catalytic reduction catalyst, comprising the steps of converting the NO x to N 2, The method of claim 7.
  13. 前記ステップ(c)が、NO を捕集するステップを含む、請求項7に記載の方法。 Wherein step (c) comprises the step of collecting the NO x, the method according to claim 7.
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WO2010126870A1 (en) 2010-11-04
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BRPI1015344A2 (en) 2016-04-19
KR20120017018A (en) 2012-02-27

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