WO2013022516A1 - Procédé et système pour la réduction des émissions de n2o à partir de systèmes de gaz d'échappement - Google Patents

Procédé et système pour la réduction des émissions de n2o à partir de systèmes de gaz d'échappement Download PDF

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Publication number
WO2013022516A1
WO2013022516A1 PCT/US2012/041496 US2012041496W WO2013022516A1 WO 2013022516 A1 WO2013022516 A1 WO 2013022516A1 US 2012041496 W US2012041496 W US 2012041496W WO 2013022516 A1 WO2013022516 A1 WO 2013022516A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
downstream flow
engine
trap
catalytic reduction
Prior art date
Application number
PCT/US2012/041496
Other languages
English (en)
Inventor
Brad J. Adelman
Russell P. Zukouski
Matthew Albert TYO
Dean Alan Oppermann
Original Assignee
International Engine Intellectual Property Company, Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Engine Intellectual Property Company, Llc filed Critical International Engine Intellectual Property Company, Llc
Publication of WO2013022516A1 publication Critical patent/WO2013022516A1/fr

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Classifications

    • 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]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • 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
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/18—Ammonia
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0408—Methods of control or diagnosing using a feed-back loop
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1616—NH3-slip from catalyst
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • NOx gas emissions from an engine can be reduced using a selective catalytic reduction volume (SCR) disposed in-line with the exhaust exhaust pipe of the engine.
  • SCR selective catalytic reduction volume
  • the SCR volume uses ammonia to break down NO x emissions into nitrogen and water.
  • the SCR delivers, for example, a urea solution, which is sprayed into the exhaust stream by an injection system.
  • the urea solution is used as a precursor to generate ammonia (NH 3 ) on a carrier supporting a catalyst.
  • NH 3 gas and/or NH 3 liquid may be provided as the reduction agent to the exhaust stream without an intermediate precursor.
  • the SCR volume may be used in both transient and steady state systems.
  • steady state systems a sufficient amount of NH 3 is used to provide a stoichiometric with the desired level of NO x removal.
  • the level of reductant stored on the catalyst surface is relatively constant and, as a result, only a limited amount of NH 3 gas passes through the SCR volume and into the environment. Passage of the ammonia reductant to the outlet of the exhaust is known as "NH 3 slip.” This NH 3 slip is undesirable since the NH 3 gas may be considered a pollutant.
  • Control of NH 3 slip may also be difficult to maintain when the engine operates in a lean burn range, where the air-to-fuel ratio of the mixture provided is high compared to the typical stoichiometric ratio for engine operation. Operation in the lean burn range results in higher temperatures. The higher temperatures, in turn, cause larger amounts of NO x emission to pass through the SCR volume.
  • the exhaust system may be unable to limit NO x emissions to an acceptable level given the limited amount of NH 3 employed in the SCR.
  • a reduction in the NO x may be obtained if a larger amount of NH 3 is used in the SCR.
  • the amount of NH 3 slip may also increase to an undesirable level.
  • Some engine exhaust systems may include an NH 3 oxidation catalyst that is disposed downstream of the SCR volume.
  • the NH 3 oxidation catalyst may be separate or overlapping with the rear of the SCR volume and often contains low levels of Pt.
  • Pt reacts with the NH 3 slip it is possible to form N 2 0 or NO x as a byproduct, although N 2 is the desired product.
  • N 2 0 gas is a known potent greenhouse gas and its emission from the exhaust is likewise undesirable.
  • Apparatus described herein relate to an exhaust system for an engine.
  • the exhaust system comprises a selective catalytic reduction volume configured to receive exhaust gas from the engine and uses NH 3 as a reductant to convert NO x to nitrogen and water.
  • An NO x trap is disposed to receive a downstream flow of exhaust gas from the selective catalytic reduction volume.
  • the NO x trap includes an NO x adsorber for storing residual NO x in the downstream flow of exhaust gas.
  • the NH 3 slip in the downstream flow of exhaust gas from the selective catalytic reduction volume reacts with the adsorbed NO x and is converted to nitrogen and water.
  • Further apparatus described herein relate to a method for use in an exhaust system of an engine.
  • the method comprises providing a flow of an exhaust gas from the engine, wherein the flow of exhaust gas includes NO x .
  • a portion of the NO x in the exhaust gas is reduced to nitrogen and water using NH 3 as a reductant and produces a downstream flow of exhaust gas having a residual amount of NO x and an amount of NH 3 slip.
  • the residual amount of NO x in the downstream flow is trapped on an NO x adsorber.
  • the adsorbed NO x is used to convert the NH 3 slip in the downstream flow to nitrogen and water.
  • the diesel engine comprises a diesel engine core that generates NO x as an exhaust gas.
  • a selective catalytic reduction volume is configured to receive the exhaust gas from the diesel engine core and uses NH 3 as a reductant to convert the NO x in the exhaust gas to nitrogen and water.
  • An NO x trap is disposed to receive a downstream flow of exhaust gas from the selective catalytic reduction volume. The downstream flow includes residual NO x and residual NH 3 .
  • the NO x trap includes an NO x adsorber for storing an amount of the residual NO x in the downstream flow. The residual amount NH 3 reacts with the adsorbed NO x and is converted to nitrogen and water.
  • FIG. 1 illustrates a diesel engine having an exhaust system that includes a lean NO x trap downstream from a selective catalytic reduction volume, where the selective catalytic reduction volume is configured to receive exhaust gas from a diesel engine core.
  • FIG. 2 illustrates the diesel engine of FIG. 1, wherein an NH 3 slip oxidizer is disposed downstream of the lean NO x trap.
  • FIG. 3 illustrates the diesel engine of FIG. 2, wherein a diesel particle filter is disposed downstream of the NH 3 slip oxidizer.
  • FIG. 4 illustrates a diesel engine having a bypass system that selectively directs a downstream flow of exhaust gas to a flow path that includes a lean NO x trap.
  • FIG. 5 is a flow diagram of operations that may be executed to process an exhaust gas of a diesel engine.
  • FIG. 1 illustrates a diesel engine 10 having an exhaust system 15 and a diesel engine core 20.
  • the diesel engine core 20 is configured to burn fuel which, in turn, generates a flow of exhaust gases having NO x .
  • the exhaust gases are provided to the exhaust system 15 through a conduit, such as a pipe 30.
  • the exhaust system 15 includes a selective catalytic reduction volume 25 (SCR) that receives the exhaust gas from the diesel engine core 20 through pipe 30.
  • SCR 25 uses NH 3 as a reductant in converting NO x to nitrogen and water.
  • the NH 3 may be provided in a number of different forms.
  • the SCR 25 may use a urea solution which is sprayed into the exhaust stream by an injection system and then converted into NH 3 on a carrier supporting a catalyst.
  • NH 3 gas and/or NH 3 liquid may be provided directly as the reduction agent in the exhaust stream. In each instance, NH 3 is the ultimate reductant used to convert the NO x .
  • the SCR 25 may be configured to remove a predetermined amount of NO x in the exhaust gases when the diesel engine core 20 operates in a steady state during base operation. While in base operation, a stoichiometric amount of NH 3 can be used by the SCR 25 to reduce the NO x to a desirable level in which, for example, substantially all of the NO x in the exhaust gases from the diesel engine core 20 are reduced. Even during base operation of the diesel engine core 20, the SCR 25 may be provided with an amount of NH 3 that is greater than that required to maintain the stoichiometric relationship. As a result, an amount of NH 3 that has not reacted with the NO x is provided from the SCR 25 in a downstream flow of exhaust gas. The presence of NH 3 in the downstream flow is known as "NH 3 slip.”
  • NH 3 slip is also an issue during transient operation of the diesel engine core 20.
  • any acceleration or deceleration of the vehicle results in a corresponding change in the speed of operation of the diesel engine core 20.
  • the flow of exhaust gases to the exhaust system 15 likewise increases.
  • the SCR 25 increases the amount of NH 3 that it utilizes in order to reduce the NO x to acceptable levels. This increased introduction of NH3, however, may result in significant NH 3 slip if too much NH 3 is employed.
  • the exhaust system 15 includes an NO x trap 35 that receives the downstream flow of exhaust gas, including NH 3 slip from the SCR 25.
  • the NO x trap 35 includes an NO x adsorber 37 that stores residual NO x that is present in the downstream flow of exhaust gas.
  • the NO x adsorber 37 may be formed, for example, from a basic metal oxide (such as BaO, K 2 0, Ce0 2 ) or other adsorber material.
  • NO x slip from SCR 25 is trapped onto the NO x adsorber 37 of NO x trap
  • the NO x slip can be held in the NO x trap 35 and stored over a large temperature range. This temperature range is greater than that of the temperature range associated with optimal NH 3 reaction with SCR 25 formulations. Instead of slipping past the SCR 25, the NH 3 encounters the NO x stored in the NO x trap 35 (usually in the form of a metal nitrate complex). This interaction results in the conversion of NH 3 and nitrate into N 2 and H 2 0.
  • FIG. 2 shows the diesel engine 10 with an alternative exhaust system 15.
  • the alternative exhaust system 15 includes an NH 3 slip oxidizer 45 configured to receive a further downstream flow of exhaust gas from the NO x trap 35.
  • the NOx trap 35 may be added to oxidize residual NH 3 in the further downstream flow of gas received from the NO x trap 35.
  • FIG. 3 shows the diesel engine 10 with a still further alternative of exhaust system 15.
  • a diesel particle filter 50 is disposed downstream of the NH 3 slip oxidizer 45.
  • the diesel particle filter 50 is designed to remove diesel particulate matter or soot from the exhaust gas of the diesel engine 10.
  • a catalyzed diesel particulate filter, which contains Pt, may afford the same functionality as the NH 3 slip oxidizer and may allow the NH 3 slip oxidizer 45 to be removed from the system 15.
  • FIG. 4 illustrates a diesel engine 10 having a bypass system 55.
  • the bypass system
  • the bypass system 55 directs the downstream flow of gas from the SCR 25 to either flow path 60 or flow path 65 based on the amount of NH 3 slip from SCR 25.
  • the amount of NH 3 slip may be measured by an ammonia sensor 70, which provides an electrical signal output, either in digital or analog form, to a controller 75.
  • the electrical signal may be either directly or indirectly correlated to the NH 3 slip.
  • Controller 75 is configured to receive the electrical signal and actuate valves 80 and 85 to inhibit/regulate the downstream flow of gas through each of the flow paths 60 and 65.
  • the bypass system 55 may be programmed to operate in various modes. For example, controller 75 may actuate valves 80 and 85 to direct the downstream flow of exhaust gas to the flow path 65 while inhibiting/regulating the flow through flow path 65. This mode of operation may be desirable when the NH 3 slip measured at NH 3 sensor 70 is at or below a predetermined threshold. In such instances, the NO x trap 35 and, if used, the NH 3 slip oxidizer 45, are bypassed, which may result in a corresponding increase in their useful lives. To place the bypass system 55 in this state, the controller 75 actuates valve 80 to direct the downstream flow of exhaust gas to port 90 while inhibiting/regulating flow of the exhaust gas to port 95. Further, exhaust gas received at port 100 of valve 85 is provided to portl05 and does not exit from port 110.
  • the bypass system 55 directs the downstream flow of exhaust gas to flow path 60.
  • the downstream flow is directed to the NO x trap 35 and, if used, through NH 3 slip oxidizer 45.
  • the controller 75 actuates valve 80 to direct the downstream flow of exhaust gas to port 95 while inhibiting/regulating the flow of the exhaust gas to port 90.
  • exhaust gas received at the port 110 of valve 85 is passed to outlet port.
  • Valve 85 is also controlled to inhibit exhaust gas flow through port 100.
  • Other programmable modes may provide for a controlled flow rate of the downstream exhaust gas through either flow path 60 or 65.
  • a regulated flow rate of the downstream exhaust gas may be provided to flow path 60 while inhibiting flow through flow path 65.
  • a regulated flow rate of the downstream exhaust gas may be provided to flow path 65 while inhibiting flow through flow path 60.
  • the back pressure to SCR 25 may be controlled to increase its efficiency since the amount of time that the exhaust gas spends in the SCR 25 increases with an increase in the back pressure.
  • the downstream exhaust gas may be concurrently distributed between flow paths 60 and 65 to optimize efficiency of the exhaust system 15.
  • FIG. 5 is a flow diagram 120 of operations that may be executed to process an exhaust gas of a diesel engine. As shown, a flow of an exhaust gas having NO x is provided at operation 125. At operation 130, at least a portion of the NO x in the exhaust gas is reduced to nitrogen and water using NH 3 as a reductant. Also, an amount of NH 3 slip is generated during this reduction operation.
  • a portion of any non-reduced NO x is trapped using an NO x adsorber.
  • the adsorbed NO x is used to reduce the NH 3 slip to nitrogen and water at operation 140.
  • a residual amount of NH 3 slip remaining after operation 140 may optionally be oxidized at operation 145.

Abstract

L'invention porte sur un système d'échappement qui comprend un volume de réduction catalytique sélective qui est conçu pour recevoir du gaz d'échappement provenant d'un moteur. Le volume de réduction catalytique sélective utilise du NH3 comme agent réducteur pour convertir les NOx en azote et en eau. Un piège à NOx est disposé pour recevoir un flux aval de gaz d'échappement provenant du volume de réduction catalytique sélective. Le piège à NOx comprend un absorbeur de NOx pour le stockage des NOx résiduels présents dans le flux aval de gaz d'échappement. Le rejet de NH3 présent dans le flux aval de gaz d'échappement provenant du volume de réaction catalytique sélective réagit avec les NOx adsorbés et est converti en azote et en eau.
PCT/US2012/041496 2011-08-09 2012-06-08 Procédé et système pour la réduction des émissions de n2o à partir de systèmes de gaz d'échappement WO2013022516A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201161521419P 2011-08-09 2011-08-09
US61/521,419 2011-08-09
US201161532637P 2011-09-09 2011-09-09
US61/532,637 2011-09-09

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PCT/US2012/041496 WO2013022516A1 (fr) 2011-08-09 2012-06-08 Procédé et système pour la réduction des émissions de n2o à partir de systèmes de gaz d'échappement
PCT/US2012/041503 WO2013022517A1 (fr) 2011-08-09 2012-06-08 Procédé et système pour la réduction des nox présents dans un gaz d'échappement de moteur à l'aide d'un élément refroidisseur

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US10626769B2 (en) 2014-02-28 2020-04-21 Scania Cv Ab Exhaust treatment system and method for treatment of an exhaust stream
US10260392B2 (en) 2014-02-28 2019-04-16 Scania Cv Ab Method and system for controlling nitrogen oxide emissions from a combustion engine
US10260391B2 (en) 2014-02-28 2019-04-16 Scania Cv Ab Exhaust treatment system and method for treatment of an exhaust stream
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US10267198B2 (en) 2014-02-28 2019-04-23 Scania Cv Ab Device and method for impacting the amount of nitrogen oxides in exhaust gases from an internal combustion engine
US10273851B2 (en) 2014-02-28 2019-04-30 Scania Cv Ab Exhaust treatment system and method for treatment of an exhaust stream
US10273852B2 (en) 2014-02-28 2019-04-30 Scania Cv Ab Exhaust treatment system and method for treatment of an exhaust stream
US10273850B2 (en) 2014-02-28 2019-04-30 Scania Cv Ab Method and system for controlling nitrogen oxide emissions from a combustion engine
WO2015130217A1 (fr) * 2014-02-28 2015-09-03 Scania Cv Ab Dispositif et procédé permettant d'avoir un impact sur la quantité d'oxydes d'azote dans les gaz d'échappement provenant d'un moteur à combustion interne
US10364724B2 (en) 2014-02-28 2019-07-30 Scania Cv Ab Device and method comprising double reducing devices and a catalytically coated particle filter for treatment of an exhaust stream
US10495569B2 (en) 2015-06-05 2019-12-03 Scania Cv Ab Method and a system for determining a composition of a gas mix in a vehicle
US10344647B2 (en) 2015-08-27 2019-07-09 Scania Cv Ab Method and system for a first and a second supply of additive to an exhaust gas stream from an internal combustion engine
US10724460B2 (en) 2015-08-27 2020-07-28 Scania Cv Ab Method and system for treatment of an exhaust gas stream
US10807041B2 (en) 2015-08-27 2020-10-20 Scania Cv Ab Exhaust treatment system and method for treatment of an exhaust gas stream
US10837338B2 (en) 2015-08-27 2020-11-17 Scania Cv Ab Method and exhaust treatment system for treatment of an exhaust gas stream
US10920632B2 (en) 2015-08-27 2021-02-16 Scania Cv Ab Method and exhaust treatment system for treatment of an exhaust gas stream
US11007481B2 (en) 2015-08-27 2021-05-18 Scania Cv Ab Exhaust treatment system and method for treatment of an exhaust gas stream
KR20190036772A (ko) * 2017-09-28 2019-04-05 에이치에스디엔진 주식회사 선택적 촉매 환원 시스템
KR102367288B1 (ko) * 2017-09-28 2022-02-24 에이치에스디엔진 주식회사 선택적 촉매 환원 시스템

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