US20080141662A1 - Fluid injecting and mixing systems for exhaust after-treatment devices - Google Patents
Fluid injecting and mixing systems for exhaust after-treatment devices Download PDFInfo
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- US20080141662A1 US20080141662A1 US11/862,293 US86229307A US2008141662A1 US 20080141662 A1 US20080141662 A1 US 20080141662A1 US 86229307 A US86229307 A US 86229307A US 2008141662 A1 US2008141662 A1 US 2008141662A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—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
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/30—Arrangements for supply of additional air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination 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
- F01N2240/20—Combination 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 flow director or deflector
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- 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
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- 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
- Y02T10/40—Engine management systems
Definitions
- the present disclosure relates to exhaust after-treatment devices. More particularly, the disclosure pertains to regeneration, oxidation or reduction of emissions by such devices.
- Exhaust after-treatment systems for on-highway Diesel engines will typically include Diesel particulate filters (DPF), NO, adsorbers (LNT) and selective catalytic reduction (SCR) systems in upcoming model years.
- DPF Diesel particulate filters
- LNT adsorbers
- SCR selective catalytic reduction
- a regenerative oxidizing or reducing fluid is needed for proper functioning and/or maintenance of the substrates used in each of these devices.
- DPFs will require injection of hydrocarbons (HC), for example, Diesel fuel, for periodic regeneration or oxidation of the trapped soot in the filter.
- SCR systems rely on injection of a reductant (typically urea) upstream of a catalyst for reduction of oxides of nitrogen emissions.
- the present teachings are directed to auxiliary piping, alternative pipe routing and auxiliary devices needed to facilitate injection, mixing, evaporation and/or hydrolysis of the secondary fluids needed for vehicular exhaust after-treatment systems.
- secondary fluids are, for example and without limitation, regenerating fluids or oxidizing fluids or reducing fluids.
- a pipe along the after-treatment device runs parallel to the exhaust flow.
- This pipe enters the after-treatment device from the side, upstream from the device substrate needing the secondary fluid.
- this pipe Prior to and during injection, this pipe is fed with compressed air to achieve pressure higher than that at the point where it enters the exhaust flow and to achieve flow rate sufficient for adequate mixing, evaporation and/or hydrolysis of the secondary fluid.
- a valve maintains this positive pressure in the pipe. The secondary fluid is injected into this pipe and the valve is opened as needed.
- one or more pipes parallel to the main exhaust pipe between the engine and the after-treatment device run from a location off the exhaust manifold or turbocharger upstream of a turbine inlet to the point in the after-treatment system just upstream of the component requiring the injected secondary fluid.
- the exhaust after-treatment device is provided with a center channel or conduit extending through the device substrate which comprises the mixing chamber for the exhaust/secondary fluid.
- FIG. 1 is a cross-sectional view of an exhaust after-treatment system including a variety of after-treatment devices within a single housing, the system including a parallel path secondary fluid mixture system arranged in accordance with the instant teachings;
- FIG. 2 is a side partial cross-sectional view of a first alternative embodiment of an exhaust after-treatment system arranged in accordance with the principles of the instant disclosure
- FIG. 3 is a partial cross-sectional view of a second alternative embodiment of an exhaust after-treatment system arranged in accordance with the principles of the instant disclosure
- FIGS. 4A and 4B are respective side and end cross-sectional views of the after-treatment device of FIG. 3 depicting a regenerative fluid distribution element arranged in accordance with the principles of the instant disclosure;
- FIG. 5 is a cross-sectional view of a third embodiment of an exhaust after-treatment system arranged in accordance with the principles of the instant disclosure.
- FIG. 6 is a perspective view of an alternative exhaust after-treatment device with an internal mixing chamber with its outer shell removed and arranged in accordance with the principles of the instant disclosure.
- exhaust after-treatment system 100 includes a multi-purpose exhaust after-treatment device containing several elements. Input exhaust to the device is shown at arrow 130 , while output exhaust from the device is shown at arrow 132 .
- the multi-purpose after-treatment device comprises a first Diesel oxidation catalyst or NO x adsorber substrate 102 a , a selective catalytic reduction substrate 104 , a second Diesel oxidation catalyst or NO x adsorber substrate 102 b , a Diesel particulate filter substrate 106 and a third Diesel oxidation catalyst or NO x adsorber substrate 102 c . Each of these substrates are separated by an inter-substrate gap for purposes of receiving a secondary fluid distribution element to be discussed below.
- a urea mixing tube 106 runs substantially parallel to exhaust flow alongside the exhaust after-treatment device and receives a combination of urea and compressed air at an input 108 for mixing within a chamber 116 of conduit 106 .
- a valve 120 a introduces the compressed air/urea mixture into a first regenerative fluid distribution element 122 a placed between substrates 102 a and 104 and carrying a plurality of radially oriented perforations or orifices 123 for directing the secondary fluid coming from conduit 106 to the input face of substrate 104 .
- a hydrocarbon mixing tube 110 also extends substantially parallel to the exhaust flow and receives a mixture of hydrocarbons, such as Diesel fuel, and compressed air at an input 112 for mixing in chamber 118 of conduit 110 .
- a glow plug or other auxiliary heat component 114 may extend into the mixing chamber 118 .
- a valve 120 b is used to meter the mixture of exhaust and secondary fluid into a distribution element 122 b .
- Conduits 106 and 110 enter the after-treatment device from the side, upstream from the particular substrate requiring the secondary fluid.
- these pipes Prior to and during injection, these pipes are fed additionally with compressed air to achieve a pressure higher than that at the point where the fluid/exhaust mixture enters the exhaust flow through the device and at a flow sufficient for proper mixing, evaporation and/or hydrolysis of the secondary fluid.
- a valve maintains this positive pressure in the pipe. The secondary fluid is injected and the valve is opened as needed.
- auxiliary devices might also be incorporated into this parallel piping system, including heating devices to aid in evaporation of secondary fluids, burners to assist in regeneration of LNTs and/or DPFs, and/or devices to create laminar or turbulent flow profiles or to aid in mixing of the exhaust gas and secondary fluids.
- the conduits such as 106 and 110 may be physically attached to the shell of the after-treatment device housing in such a way that heat transfer from the after-treatment device occurs thereby aiding the heating of the air/secondary fluid mixture.
- exhaust after-treatment system 200 utilizes auxiliary piping for establishing a parallel exhaust flow stream into which is injected the secondary fluid.
- Diesel engine 202 has an exhaust manifold 204 which empties into a turbocharger 206 . Exhaust is then carried via exhaust pipe 208 to an input 222 of an exhaust after-treatment device 220 .
- Substantially parallel to the flow of exhaust through conduit 208 is a conduit 210 for carrying exhaust likewise directly from the exhaust manifold 204 or, optionally, from turbocharger 206 to a secondary input 224 of after-treatment device 220 .
- Injector 212 injects the secondary fluid required into the exhaust stream flowing through conduit 210 for introduction to device 220 at input 224 .
- conduit 210 runs from a location on the exhaust manifold 204 or from a turbocharger 206 upstream of the turbine inlet to a point in the after-treatment system just upstream of the substrate component requiring the injected secondary fluid. Because conduit 210 originates at a location having pressure much higher than that just upstream of the substrate 226 , flow of exhaust through conduit 210 , past the injector 212 and through the mixing length of conduit 210 would be insured.
- Exhaust after-treatment system 300 includes an after-treatment device 306 situated between an exhaust pipe 304 and a tailpipe 332 . Exhaust flow is shown by arrows 302 .
- exhaust flows both through substrate 326 and through substantially parallel conduit 312 past an injector 316 for injecting secondary fluid into the exhaust flow as shown by arrow 322 .
- This mixture then flows into chamber 311 of device 306 and there flows both through substrate 328 and back through a second parallel pipe 314 past a second injector 318 .
- the mixture flows as shown in arrow 324 back to chamber 310 for treatment of substrate 326 . Since this configuration may not necessarily carry gas from an area of higher pressure to one of lower pressure, an auxiliary pumping device 320 could be made part of system 300 to facilitate proper flow and adequate mixing, evaporation and/or hydrolysis of the secondary fluid.
- both of the embodiments of FIGS. 2 and 3 would expel the mixture of exhaust gas and injected secondary fluid into a chamber just upstream of the after-treatment substrate component being treated through a series of orifices 404 in a toroidal or helical ring 402 adjacent to the chamber's outer skin.
- one or more valves may be positioned in the system to initiate and halt exhaust flow through the parallel pipe or pipes.
- Exhaust after-treatment system 500 includes an input exhaust pipe 502 having an injector 504 for injecting secondary fluid into the exhaust stream entering input 518 of after-treatment device 510 .
- the mixing chamber is contained inside after-treatment device 510 by forming a channel for receipt of a mixing conduit 508 which extends through the substrate 512 .
- the exhaust outlet 520 of the device 510 is located at the same end as the exhaust inlet.
- a turnaround chamber 516 takes the mixture of exhaust gas and secondary fluid and forces it to turn in a reverse direction and flow through the substrate orifices itself thence to an output chamber 514 for expulsion from output 520 .
- FIG. 6 An alternative to the after-treatment device 510 shown in FIG. 5 is set forth in FIG. 6 .
- two pipes running from a chamber at the front face of the after-treatment device substrate pass through the after-treatment device substrate to its rear face.
- One of these pipes carries exhaust gas through the catalyst substrate to its rear face where flow would reverse and pass back through the substrate itself.
- the second pipe would carry the gas after its emerges from the front face of the substrate and reverses direction again back through the internal channel of the substrate to the chamber in front of a second downstream substrate.
- An example would be an SCR system followed by a DPF, where secondary fluids must be injected and mixed prior to each after-treatment device.
- the arrangement of FIG. 6 enables proper introduction of the secondary fluid in situations where such might be otherwise impracticable.
- one or more valves may be positioned in the system to close off the injectors from the exhaust flow.
- Device 600 of FIG. 6 receives exhaust gas flow from exhaust pipe 602 , the flow being depicted by arrows 604 a .
- Exhaust input conduit 606 forms a first mixing chamber for the exhaust gas and the secondary fluid injected via injector 610 into the input volume defined by a first partition 608 on one side thereof.
- the exhaust/secondary fluid mixture then proceeds as shown by arrows 604 b down the conduit 606 to a turnaround chamber at a downstream face of the substrate 616 defined by a second partition 618 .
- the exhaust/secondary fluid mixture then proceeds via arrows 604 c back through the structure of the substrate 616 itself to a second injection area defined between the substrate 616 and partition 608 where a second injector 612 injects a further secondary fluid into the exhaust stream for carrying back through substrate 616 through a second internal conduit 614 for use downstream by a further after-treatment device which is located to the left of partition 618 as shown in FIG. 6 .
- This output flow of exhaust/secondary fluid is shown by arrows 604 d.
- Systems arranged in accordance with the principles of the disclosure herein provide packaging advantages where the envelope for the after-treatment system is small and a combination of after-treatment devices must be coupled together in a common housing shell.
- Systems in accordance with the disclosure likewise provide ease of configuration in situations where there is insufficient length in the main exhaust pipe to support proper mixing, evaporation, and/or hydrolysis of the secondary fluid. Additionally, such systems provide more effective mixing and uniformity of the mixture in cases where the mixing conduits can be made with a better length-to-diameter ratio and/or a straighter path than the main exhaust pipe.
- a tunable entry path for the secondary fluid-rich mixture into a region upstream of the after-treatment component being treated is provided.
- the systems of the instant disclosure enable use of larger diameter catalyst substrates (for better flow uniformity and lower system back pressure), which will in many cases require positioning of the substrates close together, thereby eliminating lengths of pipe, end cones, etc., between the substrates that would otherwise be suitable for injection, and proper mixing of the exhaust stream with the secondary fluid in use.
Abstract
A system for applying secondary fluids to vehicular exhaust after-treatment apparatus utilizes a mixing chamber coupled for receipt of a portion of the vehicle's exhaust flow. A source of secondary fluid is coupled to the mixing chamber and a fluid distribution element is positioned in a mean exhaust flow conduit upstream of the exhaust after-treatment apparatus. The fluid distribution element presents a preselected pattern of fluid flow toward an upstream face of the after-treatment apparatus.
Description
- This application claims the benefit of U.S. Provisional Application No. 60/874,921, filed on Dec. 14, 2006, which is hereby incorporated by reference.
- The present disclosure relates to exhaust after-treatment devices. More particularly, the disclosure pertains to regeneration, oxidation or reduction of emissions by such devices.
- The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
- Exhaust after-treatment systems for on-highway Diesel engines will typically include Diesel particulate filters (DPF), NO, adsorbers (LNT) and selective catalytic reduction (SCR) systems in upcoming model years. A regenerative oxidizing or reducing fluid (a secondary fluid) is needed for proper functioning and/or maintenance of the substrates used in each of these devices. In most applications, DPFs will require injection of hydrocarbons (HC), for example, Diesel fuel, for periodic regeneration or oxidation of the trapped soot in the filter. SCR systems rely on injection of a reductant (typically urea) upstream of a catalyst for reduction of oxides of nitrogen emissions. LNTs require periodic regeneration using exhaust gas rich in hydrocarbon or carbon monoxide, typically provided by injecting excess Diesel fuel into the exhaust stream. Currently, common practice for injection of these hydrocarbon fuels and urea is to inject them into the exhaust pipe upstream of the after-treatment device. This injection must be done at a location far enough upstream of the device to insure adequate mixing, evaporation and/or hydrolysis of the injected fluid, typically a linear distance of ten or more pipe diameters upstream.
- Disadvantages of the conventional method arise when SCR, LNT, and/or DPF systems must be either packaged into a restricted space or coupled together in a common housing. There may be insufficient exhaust pipe length available for adequate mixing, evaporation, and/or hydrolysis of the injected fluid, or the use of sufficient exhaust pipe length will result in unacceptable total back pressure for the after-treatment system. Due to packaging constraints, there may also be after-treatment components positioned in the exhaust pipe path needed for injection, mixing, evaporation, and/or hydrolysis, which would interfere with the proper functioning of the after-treatment devices.
- Therefore there is seen to be a need in the art for an arrangement to facilitate adequate mixing, evaporation and/or hydrolysis of the injected secondary fluid where a suitable length of exhaust pipe is not available.
- The present teachings are directed to auxiliary piping, alternative pipe routing and auxiliary devices needed to facilitate injection, mixing, evaporation and/or hydrolysis of the secondary fluids needed for vehicular exhaust after-treatment systems. Such secondary fluids are, for example and without limitation, regenerating fluids or oxidizing fluids or reducing fluids.
- In one aspect of the invention, a pipe along the after-treatment device runs parallel to the exhaust flow. This pipe enters the after-treatment device from the side, upstream from the device substrate needing the secondary fluid. Prior to and during injection, this pipe is fed with compressed air to achieve pressure higher than that at the point where it enters the exhaust flow and to achieve flow rate sufficient for adequate mixing, evaporation and/or hydrolysis of the secondary fluid. At the point where the mixing pipe enters the exhaust flow, a valve maintains this positive pressure in the pipe. The secondary fluid is injected into this pipe and the valve is opened as needed.
- In a second aspect of the present teachings, one or more pipes parallel to the main exhaust pipe between the engine and the after-treatment device run from a location off the exhaust manifold or turbocharger upstream of a turbine inlet to the point in the after-treatment system just upstream of the component requiring the injected secondary fluid.
- In a third aspect of the instant teachings, the exhaust after-treatment device is provided with a center channel or conduit extending through the device substrate which comprises the mixing chamber for the exhaust/secondary fluid.
- Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
- The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.
- The objects and features of the present teachings will become apparent from a reading of a detailed description, taken in conjunction with the drawing, in which:
-
FIG. 1 is a cross-sectional view of an exhaust after-treatment system including a variety of after-treatment devices within a single housing, the system including a parallel path secondary fluid mixture system arranged in accordance with the instant teachings; -
FIG. 2 is a side partial cross-sectional view of a first alternative embodiment of an exhaust after-treatment system arranged in accordance with the principles of the instant disclosure; -
FIG. 3 is a partial cross-sectional view of a second alternative embodiment of an exhaust after-treatment system arranged in accordance with the principles of the instant disclosure, -
FIGS. 4A and 4B are respective side and end cross-sectional views of the after-treatment device ofFIG. 3 depicting a regenerative fluid distribution element arranged in accordance with the principles of the instant disclosure; -
FIG. 5 is a cross-sectional view of a third embodiment of an exhaust after-treatment system arranged in accordance with the principles of the instant disclosure; and -
FIG. 6 is a perspective view of an alternative exhaust after-treatment device with an internal mixing chamber with its outer shell removed and arranged in accordance with the principles of the instant disclosure. - The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses.
- With reference to
FIG. 1 , exhaust after-treatment system 100 includes a multi-purpose exhaust after-treatment device containing several elements. Input exhaust to the device is shown atarrow 130, while output exhaust from the device is shown atarrow 132. The multi-purpose after-treatment device comprises a first Diesel oxidation catalyst or NOx adsorber substrate 102 a, a selectivecatalytic reduction substrate 104, a second Diesel oxidation catalyst or NOx adsorber substrate 102 b, a Dieselparticulate filter substrate 106 and a third Diesel oxidation catalyst or NOx adsorber substrate 102 c. Each of these substrates are separated by an inter-substrate gap for purposes of receiving a secondary fluid distribution element to be discussed below. - A
urea mixing tube 106 runs substantially parallel to exhaust flow alongside the exhaust after-treatment device and receives a combination of urea and compressed air at aninput 108 for mixing within achamber 116 ofconduit 106. Avalve 120 a introduces the compressed air/urea mixture into a first regenerative fluid distribution element 122 a placed betweensubstrates orifices 123 for directing the secondary fluid coming fromconduit 106 to the input face ofsubstrate 104. - A
hydrocarbon mixing tube 110 also extends substantially parallel to the exhaust flow and receives a mixture of hydrocarbons, such as Diesel fuel, and compressed air at aninput 112 for mixing inchamber 118 ofconduit 110. Optionally, a glow plug or otherauxiliary heat component 114 may extend into themixing chamber 118. Avalve 120 b is used to meter the mixture of exhaust and secondary fluid into adistribution element 122 b.Conduits - These parallel pipes expel the mixture of air and injected secondary fluid into the exhaust after-treatment device inter-substrate chamber just upstream of that substrate to a series of orifices tuned to provide the flow pattern needed across the face of the substrate being treated.
- Other auxiliary devices might also be incorporated into this parallel piping system, including heating devices to aid in evaporation of secondary fluids, burners to assist in regeneration of LNTs and/or DPFs, and/or devices to create laminar or turbulent flow profiles or to aid in mixing of the exhaust gas and secondary fluids. Alternatively, the conduits such as 106 and 110 may be physically attached to the shell of the after-treatment device housing in such a way that heat transfer from the after-treatment device occurs thereby aiding the heating of the air/secondary fluid mixture.
- In the embodiment of
FIG. 2 , exhaust after-treatment system 200 utilizes auxiliary piping for establishing a parallel exhaust flow stream into which is injected the secondary fluid.Diesel engine 202 has anexhaust manifold 204 which empties into aturbocharger 206. Exhaust is then carried viaexhaust pipe 208 to aninput 222 of an exhaust after-treatment device 220. Substantially parallel to the flow of exhaust throughconduit 208 is aconduit 210 for carrying exhaust likewise directly from theexhaust manifold 204 or, optionally, fromturbocharger 206 to asecondary input 224 of after-treatment device 220.Injector 212 injects the secondary fluid required into the exhaust stream flowing throughconduit 210 for introduction todevice 220 atinput 224. This mixture then flows through thesubstrate 226 of after-treatment device 220 and exits atoutput 228 thereof for receipt by tailpipe orfurther exhaust pipe 230. Hence, it is seen thatconduit 210 runs from a location on theexhaust manifold 204 or from aturbocharger 206 upstream of the turbine inlet to a point in the after-treatment system just upstream of the substrate component requiring the injected secondary fluid. Becauseconduit 210 originates at a location having pressure much higher than that just upstream of thesubstrate 226, flow of exhaust throughconduit 210, past theinjector 212 and through the mixing length ofconduit 210 would be insured. - In another possible configuration such as set forth in
FIG. 3 , a pipe or pipes carry exhaust gas on a path parallel to the flow through an after-treatment substrate, bypass it and allow a diameter-to-length ratio sufficient for injection and proper mixing, evaporation, and/or hydrolysis of the secondary fluid. Exhaust after-treatment system 300 includes an after-treatment device 306 situated between anexhaust pipe 304 and atailpipe 332. Exhaust flow is shown byarrows 302. - Exhaust enters
device 306 atinlet 308 to aninput chamber 310. Fromchamber 310 exhaust flows both throughsubstrate 326 and through substantiallyparallel conduit 312 past aninjector 316 for injecting secondary fluid into the exhaust flow as shown byarrow 322. This mixture then flows intochamber 311 ofdevice 306 and there flows both throughsubstrate 328 and back through a secondparallel pipe 314 past asecond injector 318. The mixture flows as shown inarrow 324 back tochamber 310 for treatment ofsubstrate 326. Since this configuration may not necessarily carry gas from an area of higher pressure to one of lower pressure, anauxiliary pumping device 320 could be made part ofsystem 300 to facilitate proper flow and adequate mixing, evaporation and/or hydrolysis of the secondary fluid. - With reference to
FIGS. 4A and 4B , both of the embodiments ofFIGS. 2 and 3 would expel the mixture of exhaust gas and injected secondary fluid into a chamber just upstream of the after-treatment substrate component being treated through a series oforifices 404 in a toroidal orhelical ring 402 adjacent to the chamber's outer skin. In cases where injection is required on only a periodic basis (e.g., LNT or DPF regeneration), one or more valves may be positioned in the system to initiate and halt exhaust flow through the parallel pipe or pipes. - A third embodiment of an exhaust after-treatment system arranged in accordance with the principles of these teachings is set forth in
FIG. 5 . Exhaust after-treatment system 500 includes aninput exhaust pipe 502 having aninjector 504 for injecting secondary fluid into the exhauststream entering input 518 of after-treatment device 510. In this embodiment, the mixing chamber is contained inside after-treatment device 510 by forming a channel for receipt of a mixingconduit 508 which extends through thesubstrate 512. In the particular device shown inFIG. 5 , theexhaust outlet 520 of thedevice 510 is located at the same end as the exhaust inlet. Aturnaround chamber 516 takes the mixture of exhaust gas and secondary fluid and forces it to turn in a reverse direction and flow through the substrate orifices itself thence to anoutput chamber 514 for expulsion fromoutput 520. - An alternative to the after-
treatment device 510 shown inFIG. 5 is set forth inFIG. 6 . In the arrangement ofFIG. 6 , two pipes running from a chamber at the front face of the after-treatment device substrate pass through the after-treatment device substrate to its rear face. One of these pipes carries exhaust gas through the catalyst substrate to its rear face where flow would reverse and pass back through the substrate itself. The second pipe would carry the gas after its emerges from the front face of the substrate and reverses direction again back through the internal channel of the substrate to the chamber in front of a second downstream substrate. An example would be an SCR system followed by a DPF, where secondary fluids must be injected and mixed prior to each after-treatment device. By carrying exhaust gas on a path parallel to the flow through an after-treatment component, bypassing it and allowing a diameter-to-length ratio sufficient for injection and proper mixing, evaporation, and/or hydrolysis, the arrangement ofFIG. 6 enables proper introduction of the secondary fluid in situations where such might be otherwise impracticable. Again, where injection of the secondary fluid is required only on a periodic basis, one or more valves may be positioned in the system to close off the injectors from the exhaust flow. -
Device 600 ofFIG. 6 receives exhaust gas flow fromexhaust pipe 602, the flow being depicted byarrows 604 a.Exhaust input conduit 606 forms a first mixing chamber for the exhaust gas and the secondary fluid injected viainjector 610 into the input volume defined by afirst partition 608 on one side thereof. The exhaust/secondary fluid mixture then proceeds as shown byarrows 604 b down theconduit 606 to a turnaround chamber at a downstream face of thesubstrate 616 defined by asecond partition 618. The exhaust/secondary fluid mixture then proceeds viaarrows 604 c back through the structure of thesubstrate 616 itself to a second injection area defined between thesubstrate 616 andpartition 608 where asecond injector 612 injects a further secondary fluid into the exhaust stream for carrying back throughsubstrate 616 through a secondinternal conduit 614 for use downstream by a further after-treatment device which is located to the left ofpartition 618 as shown inFIG. 6 . This output flow of exhaust/secondary fluid is shown byarrows 604 d. - Systems arranged in accordance with the principles of the disclosure herein provide packaging advantages where the envelope for the after-treatment system is small and a combination of after-treatment devices must be coupled together in a common housing shell. Systems in accordance with the disclosure likewise provide ease of configuration in situations where there is insufficient length in the main exhaust pipe to support proper mixing, evaporation, and/or hydrolysis of the secondary fluid. Additionally, such systems provide more effective mixing and uniformity of the mixture in cases where the mixing conduits can be made with a better length-to-diameter ratio and/or a straighter path than the main exhaust pipe. Furthermore, a tunable entry path for the secondary fluid-rich mixture into a region upstream of the after-treatment component being treated is provided. Finally, the systems of the instant disclosure enable use of larger diameter catalyst substrates (for better flow uniformity and lower system back pressure), which will in many cases require positioning of the substrates close together, thereby eliminating lengths of pipe, end cones, etc., between the substrates that would otherwise be suitable for injection, and proper mixing of the exhaust stream with the secondary fluid in use.
- The invention has been described with reference to embodiments which have been set forth for the sake of example only. The invention is to be described with reference to the appropriately construed claims.
Claims (12)
1. A system for applying secondary fluids to vehicular after-treatment apparatus, the system comprising:
a mixing chamber coupled for receipt of a portion of exhaust flow at a mixing chamber inlet;
a source of secondary fluid in fluid communication with the mixing chamber; and
a fluid distribution element positioned in a main exhaust flow conduit upstream of the exhaust after-treatment apparatus and coupled to an output of the mixing chamber, the flow distribution element operative to present a preselected pattern of fluid flow toward an upstream face of the after-treatment apparatus.
2. The system of claim 1 wherein the mixing chamber is separate from the main exhaust flow conduit.
3. The system of claim 2 wherein the mixing chamber comprises a conduit extending substantially parallel to the main exhaust flow conduit.
4. The system of claim 1 further comprising a secondary fluid injector for injecting, under pressure, secondary fluid received from the source of secondary fluid into the mixing chamber.
5. The system of claim 1 further comprising a valve positioned in the output of the mixing chamber and operative to selectively permit and prohibit fluid communication between the mixing chamber and the fluid distribution element.
6. The system of claim 1 wherein the exhaust after-treatment apparatus comprises a particulate filter and the secondary fluid comprises filter regenerating fluid.
7. The system of claim 1 wherein the exhaust after-treatment device comprises a selective catalytic reduction catalytic converter and the secondary fluid comprises a reductant.
8. The system of claim 1 wherein the exhaust after-treatment device comprises a nitrous oxide adsorber and the secondary fluid comprises a converter substrate regenerating fluid.
9. The system of claim 1 wherein the mixing chamber is positioned within a housing of the after-treatment apparatus.
10. The system of claim 3 wherein the mixing chamber input is coupled to an exhaust manifold of the vehicle.
11. The system of claim 1 wherein the fluid distribution element comprises a perforated conduit having a series of orifices positioned with respect to the upstream face of the after-treatment apparatus so as to present the preselected pattern.
12. The system of claim 11 wherein the perforated conduit is toroidal.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/862,293 US20080141662A1 (en) | 2006-12-14 | 2007-09-27 | Fluid injecting and mixing systems for exhaust after-treatment devices |
CA002667062A CA2667062A1 (en) | 2006-12-14 | 2007-10-30 | Fluid injecting and mixing systems for exhaust after-treatment devices |
BRPI0720024-2A BRPI0720024A2 (en) | 2006-12-14 | 2007-10-30 | FLUID INJECTION AND MIXING SYSTEMS FOR EXHAUST TREATMENT DEVICES |
MX2009006290A MX2009006290A (en) | 2006-12-14 | 2007-10-30 | Fluid injecting and mixing systems for exhaust after-treatment devices. |
KR1020097014524A KR20090094457A (en) | 2006-12-14 | 2007-10-30 | Fluid injecting and mixing systems for exhaust after-treatment devices |
DE112007002861T DE112007002861T5 (en) | 2006-12-14 | 2007-10-30 | Fluid injection and mixing systems for exhaust aftertreatment devices |
PCT/US2007/022851 WO2008076175A2 (en) | 2006-12-14 | 2007-10-30 | Fluid injecting and mixing systems for exhaust after-treatment devices |
CNA2007800460272A CN101563529A (en) | 2006-12-14 | 2007-10-30 | Fluid injecting and mixing systems for exhaust after-treatment devices |
JP2009541300A JP2010513773A (en) | 2006-12-14 | 2007-10-30 | Mixing system for fluid injection and exhaust aftertreatment devices |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US87492106P | 2006-12-14 | 2006-12-14 | |
US11/862,293 US20080141662A1 (en) | 2006-12-14 | 2007-09-27 | Fluid injecting and mixing systems for exhaust after-treatment devices |
Publications (1)
Publication Number | Publication Date |
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US20080141662A1 true US20080141662A1 (en) | 2008-06-19 |
Family
ID=39525486
Family Applications (1)
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---|---|---|---|
US11/862,293 Abandoned US20080141662A1 (en) | 2006-12-14 | 2007-09-27 | Fluid injecting and mixing systems for exhaust after-treatment devices |
Country Status (9)
Country | Link |
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US (1) | US20080141662A1 (en) |
JP (1) | JP2010513773A (en) |
KR (1) | KR20090094457A (en) |
CN (1) | CN101563529A (en) |
BR (1) | BRPI0720024A2 (en) |
CA (1) | CA2667062A1 (en) |
DE (1) | DE112007002861T5 (en) |
MX (1) | MX2009006290A (en) |
WO (1) | WO2008076175A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
MX2009006290A (en) | 2009-10-12 |
CA2667062A1 (en) | 2008-06-26 |
DE112007002861T5 (en) | 2009-10-22 |
BRPI0720024A2 (en) | 2013-12-17 |
KR20090094457A (en) | 2009-09-07 |
WO2008076175A2 (en) | 2008-06-26 |
WO2008076175A3 (en) | 2008-08-21 |
JP2010513773A (en) | 2010-04-30 |
CN101563529A (en) | 2009-10-21 |
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