US20100269492A1 - Diesel aftertreatment system - Google Patents

Diesel aftertreatment system Download PDF

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Publication number
US20100269492A1
US20100269492A1 US12/430,194 US43019409A US2010269492A1 US 20100269492 A1 US20100269492 A1 US 20100269492A1 US 43019409 A US43019409 A US 43019409A US 2010269492 A1 US2010269492 A1 US 2010269492A1
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United States
Prior art keywords
exhaust
step
diesel
system
burner
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Abandoned
Application number
US12/430,194
Inventor
Adam J. Kotrba
Timothy E. Jackson
Dervis A. Yetkin
Arda Gundogan
Timothy Gardner
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Tenneco Automotive Operating Co Inc
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Tenneco Automotive Operating Co Inc
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Priority to US12/430,194 priority Critical patent/US20100269492A1/en
Assigned to TENNECO AUTOMOTIVE OPERATING COMPANY INC. reassignment TENNECO AUTOMOTIVE OPERATING COMPANY INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOTRBA, ADAM J., YETKIN, DERVIS A., GUNDOGAN, ARDA, GARDNER, TIMOTHY P., JACKSON, TIMOTHY E.
Assigned to JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT reassignment JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT AMENDMENT TO SECURITY INTEREST Assignors: CLEVITE INDUSTRIES INC., TENNECO AUTOMOTIVE OPERATING COMPANY INC., TENNECO GLOBAL HOLDINGS INC., TENNECO INC. (FORMERLY KNOWN AS TENNECO AUTOMOTIVE INC.), TENNECO INTERNATIONAL HOLDING CORP., THE PULLMAN COMPANY, TMC TEXAS INC.
Assigned to U.S. BANK NATIONAL ASSOCIATION (AS SUCCESSOR TO WACHOVIA BANK, NATIONAL ASSOCIATION) reassignment U.S. BANK NATIONAL ASSOCIATION (AS SUCCESSOR TO WACHOVIA BANK, NATIONAL ASSOCIATION) AMENDMENT TO SECURITY INTEREST Assignors: CLEVITE INDUSTRIES INC., TENNECO AUTOMOTIVE OPERATING COMPANY INC., TENNECO GLOBAL HOLDINGS INC., TENNECO INC., TENNECO INTERNATIONAL HOLDING CORP., THE PULLMAN COMPANY, TMC TEXAS INC.
Publication of US20100269492A1 publication Critical patent/US20100269492A1/en
Priority claimed from US13/197,829 external-priority patent/US20110289906A1/en
Priority claimed from US13/197,848 external-priority patent/US20110283685A1/en
Application status is Abandoned legal-status Critical

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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

A diesel exhaust gas aftertreatment system (10) is provided to treat the exhaust (12) from a diesel combustion process (14), such as a diesel compression engine (16). The system (10) includes a burner (18) that selectively supplies the exhaust (12) at an elevated temperature to the rest of the system (10), a diesel particulate filter (20) connected downstream from the burner (18) to receive the exhaust (12) therefrom, and a NOx reducing device (22) connected downstream from the filter (20) to receive the exhaust therefrom.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • Not Applicable.
  • FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
  • Not Applicable.
  • MICROFICHE/COPYRIGHT REFERENCE
  • Not Applicable.
  • FIELD OF THE INVENTION
  • This invention relates to systems and methods for treating exhaust gases from a diesel combustion process, such as a diesel compression engine, and more particularly to systems for reducing oxides of nitrogen (NOx) and particulate matter (PM) emissions from diesel compression engines.
  • BACKGROUND OF THE INVENTION
  • Environmental regulations have called for increasing emission limits that require reduction in the NOx and PM from diesel combustion processes, and in particular from diesel compression engines. While diesel particulate filters (DPF) are capable of achieving the required reductions in PM, which is typically carbonaceous particulates in the form of soot, there is a continuing need for improved systems that can provide the required reductions in NOx in connection with the particulate matter reduction provided by a DPF.
  • In this regard, systems have been proposed to provide a diesel oxidation catalyst (DOC) upstream from a DPF in order to provide an increased level of NO2 in the exhaust which reacts with the soot gathered in the DPF to produce a desired regeneration of the DPF (often referred to as a passive regeneration). However, such systems become limited at temperatures below 300° C. and typically produce a pressure drop across the oxidation catalyst that must be accounted for in the design of the rest of the system. Additionally fuel, such as hydrogen or hydrocarbon fuel, can be delivered upstream of the DOC to generate temperatures greater than 600° F. in the DPF (often referred to as active regeneration).
  • SUMMARY OF THE INVENTION
  • In accordance with one feature of the invention, a diesel exhaust gas treatment system is provided to treat the exhaust from a diesel combustion process. The system includes a burner to receive the exhaust and selectively heat the exhaust with a flame to supply the exhaust at an elevated temperature to the rest of the system, a diesel particulate filter (DPF) connected downstream from the burner to receive the exhaust therefrom, and at least one of a selective catalytic reduction catalyst (SCR) and a NOx trap connected downstream from the diesel particulate filter to receive the exhaust therefrom.
  • As one feature, the system further includes a diesel oxidation catalyst connected downstream from the burner to receive the exhaust therefrom and upstream from the DPF to deliver the exhaust thereto. In a further feature, the system further includes a fuel injector located downstream from the burner and upstream of the DOC.
  • In one feature, the system further includes a diesel oxidation catalyst connected downstream from the DPF to receive the exhaust therefrom and upstream from the SCR to deliver the exhaust thereto.
  • According to one feature, the burner includes at least one fuel injector and at least one igniter.
  • As one feature, the at least one of a selective catalytic reduction catalyst and a NOx trap is a selective catalytic reduction catalyst and further includes a reductant injector connected upstream from the catalyst.
  • In accordance with one feature of the invention, a method is provided for treating a diesel exhaust from a diesel combustion process. The method includes the steps of:
  • (a) selectively increasing the temperature of the exhaust by burning a fuel in the exhaust flow downstream from the diesel combustion process;
  • (b) removing soot from a filter by oxidizing carbon into the increased temperature exhaust provided from step (a); and
  • (c) removing NOx carried in the exhaust provided from step (b).
  • In one feature, the method further includes the step of producing NO2 by passing the exhaust from step (a) through an oxidation catalyst prior to step (b). As a further feature, the method further includes the step of injecting fuel into the exhaust after step (a) and prior to step (b).
  • In a further feature, the method of further includes the step of producing NO2 by passing the exhaust from step (b) through an oxidation catalyst prior to step (c).
  • According to one feature, step (a) includes the steps of injecting a fuel into the exhaust and igniting the fuel.
  • As one feature, step (c) includes converting NOx to N2 by passing the exhaust over a selective catalytic reduction catalyst.
  • In one feature, step (c) includes trapping NOx.
  • Other objects, features, and advantages of the invention will become apparent from a review of the entire specification, including the appended claims and drawings.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a diagrammatic representation of a diesel exhaust gas treatment system embodying the invention in connection with a diesel combustion engine; and
  • FIGS. 2-4 are a representations similar to FIG. 1, but showing alternate embodiments of the diesel exhaust gas treatment system.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • A diesel exhaust gas aftertreatment system 10 is provided to treat the exhaust 12 from a diesel combustion process 14, such as a diesel compression engine 16. The exhaust 12 will typically contain oxides of nitrogen (NOx) such as nitric oxide (NO) and nitrogen dioxide (NO2) among others, particular matter (PM), hydrocarbons, carbon monoxide (CO), and other combustion byproducts.
  • The system 10 includes a burner 18 that selectively supplies the exhaust 12 at an elevated temperature to the rest of the system 10, a diesel particulate filter (DPF) 20 connected downstream from the burner 18 to receive the exhaust 12 therefrom, and a NOx reducing device 22, such as a selective catalytic reduction catalyst (SCR) 24, as shown in FIG. 1, or a lean NOx trap 26, as shown in FIG. 2, connected downstream from the DPF 20 to receive the exhaust 12 therefrom. To overcome the lower operating temperatures in the exhaust 12 of lean-burn engines, such as the diesel compression engine 16, an active regeneration process for the DPF 20 is employed wherein fuel is ignited in the burner 18 to create a flame 28 that heats the exhaust 12 to an elevated temperature that will allow for oxidation of the PM in the DPF 20. Additionally, in connection with such active regeneration, or independent thereof, the burner 18 can be used in a similar manner to heat the exhaust 12 to an elevated temperature that will enhance the conversion efficiency of the SCR 24. Advantageously, the burner 18 can provide such elevated temperatures, either selectively or continuously, independent of any particular engine operating condition, including operating conditions that produce a low temperature (<300 C) in the exhaust 12 as it exits the engine 16. Thus, the system 10 can be operated without requiring adjustments to the engine controls.
  • The burner 18 preferably will include one or more injectors 30 for injecting suitable fuel, a couple examples of which are hydrogen and hydrocarbons, and an oxygenator, such as air, to be ignited together with unburned fuel already carried in the exhaust by one or more igniters, such as spark plugs 32. In this regard, each injector 30 can either be a combined injector that injects both the fuel and oxygenator, or a specific injector for one of the fuel or the oxygenator. Preferably, a control system, shown schematically at 34, is provided to monitor and control the flows through the injectors 30 and the ignition by the igniters 32 using any suitable processor(s), sensors, flow control valves, electric coils, etc.
  • The DPF 20 can be of any suitable construction or type, many of which are known.
  • Any suitable catalyst can be utilized for the SCR 24, examples of which include Cu based, Iron based and Vandia based catalysts of any suitable construction or type. Preferably, the system 10 also includes an reductant injector 36, again of any suitable construction and type, that can introduce a nitrogenous reductant, such as ammonia, urea, hydrocarbons, hydrogen, or syngas into the exhaust 12 to reduce the NOx content in the exhaust 12 by preferably at least 25% and by as much as 99% under the right conditions. In this regard, the temperature in the SCR will be highly dependent upon the type of reductant used. The injector 36 can be supplied by a pressurized reductant source (not shown) and controlled by the controller 34 or an independent controller (not shown).
  • With reference to FIG. 2, any suitable construction and type of lean NOx trap 26 can be utilized and preferably will store NO2 during operating conditions that utilize a lean fuel-air mixture, and reduce the stored NO2 to N2 and O2 under operating conditions that utilize a rich fuel-air mixture. In this regard, while not preferred, if required supplemental hydrocarbon fuel can be injected upstream of the trap 26 to produce a rich fuel-air condition in the trap 26 to assist in forming N2, H2O and CO2. from the stored NO2.
  • In operation, the need for active regeneration of the DPF 20 by the system 10 can be determined by based on a number of parameters or combination of parameters, such as the DPF pressure drop, DPF soot mass, a predetermined operating time set point, and fuel consumption rate. Similarly, the active regeneration of the DPF 20 can be terminated based on a number of parameters or combination of parameters, such as the DPF pressure drop, DPF soot mass, and a predetermined regeneration time set point. During active regeneration, the injection of fuel and air via the injector(s) 30 can be based on a number of parameters or combination of parameters, including the flow rate of the exhaust 12, the oxygen concentration in the exhaust 12 and, the inlet and outlet temperatures of the exhaust 12 to and from the DPF 20, with flame stability being monitored by igniter ionization detection or by comparing the inlet and outlet temperatures of the exhaust 12 to and from the burner 18.
  • Similar control schemes utilizing the corresponding and suitable parameters for the SCR 24 and/or lean NOx trap 26 can be utilized to provide active use of the burner 18 to improve performance and/or provide regeneration.
  • It should be appreciated that the system 10 can provide enhanced fuel efficiency in comparison to known aftertreatment systems that require excess fuel injection into the engine or system in order to obtain suitable regeneration of a DPF. It should also be appreciated that the burner 18 can be designed for a relatively low pressure drop in the exhaust 12 through the burner 18, particularly in comparison to systems that rely on passive or active regeneration by passing the exhaust through a DOC upstream of a DPF to provide sufficient NO2 for passive regeneration of the DPF. It should further be appreciated that the passage of the exhaust 12 through the DPF 20 upstream of the SCR 24 tends to dampen the thermal fluctuations in the SCR 24 which can simplify the control of the reductant injection.
  • With reference to FIG. 3, an alternate embodiment of the system 10 is shown wherein a DOC 40 is connected between the burner 18 and the DPF 20 to provide NO2 in the exhaust 12 for passive regeneration of the DPF 20 at some level during operating conditions that are favorable to passive regeneration. This can reduce the demand for active regeneration by the burner 18 and thereby increase the overall fuel efficiency of the system 10.
  • FIG. 4 shows yet another embodiment of the system 10 similar to FIG. 3, but having yet another DOC 42 added between DPF 20 and the SCR 24 to provide additional NO2 to optimize the reactions in the SCR 24. As further alternative for the system 10, a fuel injector 44 can be added between the burner 18 and the DOC 40 to selectively provide additional fuel, two examples of which are hydrocarbon fuel and hydrogen, to enhance the reactions in the DOC 40 and produce additional quantities of NO2 in the exhaust under certain operating conditions.

Claims (13)

1. A diesel exhaust gas treatment system to treat the exhaust from a diesel combustion process, the system comprising:
a burner to receive the exhaust and selectively heat the exhaust with a flame to supply the exhaust at an elevated temperature to the rest of the system;
a diesel particulate filter connected downstream from the burner to receive the exhaust therefrom; and
at least one of a selective catalytic reduction catalyst and a NOx trap connected downstream from the diesel particulate filters to receive the exhaust therefrom
2. The system of claim 1 further comprising a diesel oxidation catalyst connected downstream from the burner to receive the exhaust therefrom and upstream from the diesel particulate filters to deliver the exhaust thereto.
3. The system of claim 2 further comprising a diesel oxidation catalyst connected downstream from the diesel particulate filters to receive the exhaust therefrom and upstream from the selective catalytic reduction catalyst to deliver the exhaust thereto.
4. The system of claim 2 further comprising a fuel injector located downstream from the burner and upstream of the DOC.
5. The system of claim 1 wherein the burner comprises at least one fuel injector and at least one igniter.
6. The system of claim 1 wherein the at least one of a selective catalytic reduction catalyst and a NOx trap is a selective catalytic reduction catalyst and further comprising a reductant injector connected upstream from the catalyst.
7. A method of treating a diesel exhaust from a diesel combustion process, the method comprising the steps of:
(a) selectively increasing the temperature of the exhaust by burning a fuel in the exhaust flow downstream from the diesel combustion process;
(b) removing soot from a filter by oxidizing carbon into the increased temperature exhaust provided from step (a); and
(c) removing NOx carried in the exhaust provided from step (b).
8. The method of claim 7 further comprising the step of producing NO2 by passing the exhaust from step (a) through an oxidation catalyst prior to step (b).
9. The method of claim 8 further comprising the step of producing NO2 by passing the exhaust from step (b) through an oxidation catalyst prior to step (c).
10. The method of claim 8 further comprising the step of injecting fuel into the exhaust after step (a) and prior to step (b).
11. The method of claim 7 wherein step (a) comprises the steps of injecting a fuel into the exhaust and igniting the fuel.
12. The method of claim 7 wherein step (c) comprises converting NOx to N2 by passing the exhaust over a selective catalytic reduction catalyst.
13. The method of claim 7 wherein step (c) comprises trapping NOx.
US12/430,194 2009-04-27 2009-04-27 Diesel aftertreatment system Abandoned US20100269492A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/430,194 US20100269492A1 (en) 2009-04-27 2009-04-27 Diesel aftertreatment system

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
US12/430,194 US20100269492A1 (en) 2009-04-27 2009-04-27 Diesel aftertreatment system
PCT/US2010/032522 WO2010126870A1 (en) 2009-04-27 2010-04-27 Diesel aftertreatment system
CN2010800185883A CN102438729A (en) 2009-04-27 2010-04-27 Diesel aftertreatment system
BRPI1015344A BRPI1015344A2 (en) 2009-04-27 2010-04-27 Further processing system of diesel
KR1020117023419A KR20120017018A (en) 2009-04-27 2010-04-27 Diesel aftertreatment system
JP2012508583A JP2012525540A (en) 2009-04-27 2010-04-27 Diesel aftertreatment system
EP10770197A EP2424646A1 (en) 2009-04-27 2010-04-27 Diesel aftertreatment system
US13/197,829 US20110289906A1 (en) 2009-04-27 2011-08-04 Miniature Regeneration Unit
US13/197,848 US20110283685A1 (en) 2009-04-27 2011-08-04 Exhaust Treatment System With Hydrocarbon Lean NOx Catalyst

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US13/197,829 Continuation-In-Part US20110289906A1 (en) 2009-04-27 2011-08-04 Miniature Regeneration Unit
US13/197,848 Continuation-In-Part US20110283685A1 (en) 2009-04-27 2011-08-04 Exhaust Treatment System With Hydrocarbon Lean NOx Catalyst

Publications (1)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013019419A2 (en) * 2011-08-04 2013-02-07 Tenneco Automotive Operating Company Inc. Exhaust treatment system with hydrocarbon lean nox catalyst
WO2013039741A1 (en) * 2011-09-14 2013-03-21 Tenneco Automotive Operating Company Inc. Exhaust gas aftertreatment system for engines equipped with exhaust gas recirculation
CN103459789A (en) * 2011-03-28 2013-12-18 丰田自动车株式会社 Exhaust gas purification device for internal combustion engine
US20130340717A1 (en) * 2012-06-22 2013-12-26 Michael Avery Methods and systems for conversion of single-fuel engine to multiple-fuel engine with diesel oxidation catalyst
US8656708B2 (en) 2011-01-31 2014-02-25 Tenneco Automotive Operating Company Inc. Coaxial inlet and outlet exhaust treatment device
EP2703612A1 (en) * 2011-04-28 2014-03-05 Toyota Jidosha Kabushiki Kaisha Exhaust gas purifier for internal combustion engine
US9103252B2 (en) 2013-03-15 2015-08-11 Tenneco Automotive Operating Company Inc. Modular exhaust treatment system
US9421496B2 (en) 2011-04-28 2016-08-23 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification apparatus for internal combustion engine
CN106437949A (en) * 2016-09-20 2017-02-22 北京机械设备研究所 Following type tail gas purification device suitable for high-power vehicle
FR3042813A1 (en) * 2015-10-27 2017-04-28 Peugeot Citroen Automobiles Sa A post-treatment of exhaust gas from a combustion engine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103422946A (en) * 2012-05-22 2013-12-04 广西玉柴机器股份有限公司 DPF controllable regeneration system of engine
US9683348B2 (en) * 2013-03-15 2017-06-20 Yanmar Co., Ltd. Engine device
JP6437314B2 (en) * 2015-01-08 2018-12-12 日野自動車株式会社 Exhaust gas purification device
CN107013375A (en) * 2016-01-27 2017-08-04 北京汽车股份有限公司 Engine assembly and vehicle with same

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170758A (en) * 1960-09-01 1965-02-23 Sinclair Research Inc Method of purifying exhaust gases
US4080426A (en) * 1976-02-12 1978-03-21 New England Power Service Company Reduction of nitric oxide using catalysts pretreated with selenium
US5022226A (en) * 1988-10-03 1991-06-11 Radian Corporation Low NOx cogeneration process and system
US5082478A (en) * 1989-10-06 1992-01-21 Kyocera Corporation Particulate trap filter regenerative system
US5339630A (en) * 1992-08-28 1994-08-23 General Motors Corporation Exhaust burner catalyst preheater
US6474319B1 (en) * 2000-10-17 2002-11-05 Cummins Engine Company, Inc. Filter system for the removal of hydrocarbon deposits from a cooled exhaust gas recirculating engine
US6718757B2 (en) * 1999-06-23 2004-04-13 Southwest Research Institute Integrated method for controlling diesel engine emissions in CRT-LNT system
US6805849B1 (en) * 1998-02-06 2004-10-19 Johnson Matthey Public Limited Company System for NOx reduction in exhaust gases
US6813884B2 (en) * 2002-01-29 2004-11-09 Ford Global Technologies, Llc Method of treating diesel exhaust gases
US6928806B2 (en) * 2002-11-21 2005-08-16 Ford Global Technologies, Llc Exhaust gas aftertreatment systems
US20060179821A1 (en) * 2005-01-27 2006-08-17 Southwest Research Institute Regeneration control for diesel particulate filter for treating diesel engine exhaust
US20080028754A1 (en) * 2003-12-23 2008-02-07 Prasad Tumati Methods and apparatus for operating an emission abatement assembly
US20080264042A1 (en) * 2007-04-26 2008-10-30 Navin Khadiya METHOD AND APPARATUS FOR A NON-CATALYTIC NOx REDUCTION
US20090193794A1 (en) * 2008-01-31 2009-08-06 Caterpillar Inc. Exhaust system implementing SCR and EGR
US20100126151A1 (en) * 2007-02-21 2010-05-27 Volvo Lastagnar Ab Exhaust gas after treatment system (eats)
US20100205944A1 (en) * 2007-10-04 2010-08-19 Hino Motors, Ltd. Exhaust emission control device
US20110000190A1 (en) * 2008-02-07 2011-01-06 Mack Trucks, Inc. Method and apparatus for no2-based regeneration of diesel particulate filters using recirculated nox

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201206486Y (en) * 2008-05-13 2009-03-11 奇瑞汽车股份有限公司 Postprocessing system of diesel engine

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170758A (en) * 1960-09-01 1965-02-23 Sinclair Research Inc Method of purifying exhaust gases
US4080426A (en) * 1976-02-12 1978-03-21 New England Power Service Company Reduction of nitric oxide using catalysts pretreated with selenium
US5022226A (en) * 1988-10-03 1991-06-11 Radian Corporation Low NOx cogeneration process and system
US5082478A (en) * 1989-10-06 1992-01-21 Kyocera Corporation Particulate trap filter regenerative system
US5339630A (en) * 1992-08-28 1994-08-23 General Motors Corporation Exhaust burner catalyst preheater
US6805849B1 (en) * 1998-02-06 2004-10-19 Johnson Matthey Public Limited Company System for NOx reduction in exhaust gases
US6718757B2 (en) * 1999-06-23 2004-04-13 Southwest Research Institute Integrated method for controlling diesel engine emissions in CRT-LNT system
US6474319B1 (en) * 2000-10-17 2002-11-05 Cummins Engine Company, Inc. Filter system for the removal of hydrocarbon deposits from a cooled exhaust gas recirculating engine
US6813884B2 (en) * 2002-01-29 2004-11-09 Ford Global Technologies, Llc Method of treating diesel exhaust gases
US6928806B2 (en) * 2002-11-21 2005-08-16 Ford Global Technologies, Llc Exhaust gas aftertreatment systems
US20080028754A1 (en) * 2003-12-23 2008-02-07 Prasad Tumati Methods and apparatus for operating an emission abatement assembly
US20060179821A1 (en) * 2005-01-27 2006-08-17 Southwest Research Institute Regeneration control for diesel particulate filter for treating diesel engine exhaust
US20100126151A1 (en) * 2007-02-21 2010-05-27 Volvo Lastagnar Ab Exhaust gas after treatment system (eats)
US20080264042A1 (en) * 2007-04-26 2008-10-30 Navin Khadiya METHOD AND APPARATUS FOR A NON-CATALYTIC NOx REDUCTION
US20100205944A1 (en) * 2007-10-04 2010-08-19 Hino Motors, Ltd. Exhaust emission control device
US20090193794A1 (en) * 2008-01-31 2009-08-06 Caterpillar Inc. Exhaust system implementing SCR and EGR
US20110000190A1 (en) * 2008-02-07 2011-01-06 Mack Trucks, Inc. Method and apparatus for no2-based regeneration of diesel particulate filters using recirculated nox

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9140158B2 (en) 2011-01-31 2015-09-22 Tenneco Automotive Operating Company Inc. Coaxial inlet and outlet exhaust treatment device
US8656708B2 (en) 2011-01-31 2014-02-25 Tenneco Automotive Operating Company Inc. Coaxial inlet and outlet exhaust treatment device
US9435241B2 (en) 2011-03-28 2016-09-06 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification apparatus for internal combustion engine
EP2693012A4 (en) * 2011-03-28 2014-11-19 Toyota Motor Co Ltd Exhaust gas purification device for internal combustion engine
CN103459789A (en) * 2011-03-28 2013-12-18 丰田自动车株式会社 Exhaust gas purification device for internal combustion engine
EP2693012A1 (en) * 2011-03-28 2014-02-05 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device for internal combustion engine
US9421496B2 (en) 2011-04-28 2016-08-23 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification apparatus for internal combustion engine
EP2703612A1 (en) * 2011-04-28 2014-03-05 Toyota Jidosha Kabushiki Kaisha Exhaust gas purifier for internal combustion engine
EP2703612A4 (en) * 2011-04-28 2014-11-19 Toyota Motor Co Ltd Exhaust gas purifier for internal combustion engine
WO2013019419A3 (en) * 2011-08-04 2013-03-28 Tenneco Automotive Operating Company Inc. Exhaust treatment system with hydrocarbon lean nox catalyst
WO2013019419A2 (en) * 2011-08-04 2013-02-07 Tenneco Automotive Operating Company Inc. Exhaust treatment system with hydrocarbon lean nox catalyst
WO2013039741A1 (en) * 2011-09-14 2013-03-21 Tenneco Automotive Operating Company Inc. Exhaust gas aftertreatment system for engines equipped with exhaust gas recirculation
US20130340717A1 (en) * 2012-06-22 2013-12-26 Michael Avery Methods and systems for conversion of single-fuel engine to multiple-fuel engine with diesel oxidation catalyst
US9103252B2 (en) 2013-03-15 2015-08-11 Tenneco Automotive Operating Company Inc. Modular exhaust treatment system
FR3042813A1 (en) * 2015-10-27 2017-04-28 Peugeot Citroen Automobiles Sa A post-treatment of exhaust gas from a combustion engine
CN106437949A (en) * 2016-09-20 2017-02-22 北京机械设备研究所 Following type tail gas purification device suitable for high-power vehicle

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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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