CN104047681A - Post processing device for hybrid diesel engine exhaust fluid - Google Patents
Post processing device for hybrid diesel engine exhaust fluid Download PDFInfo
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- CN104047681A CN104047681A CN201310084100.2A CN201310084100A CN104047681A CN 104047681 A CN104047681 A CN 104047681A CN 201310084100 A CN201310084100 A CN 201310084100A CN 104047681 A CN104047681 A CN 104047681A
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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
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention relates to an engine post processing system. The system comprises an exhaust branch pipe, a turbo-supercharger and a diesel engine exhaust fluid injector, wherein the exhaust branch pipe is used for receiving the exhaust fluid from an engine; the turbo-supercharger comprises a turbine; the turbine is provided with blades and a turbine shell; the blades are communicated with the exhaust fluid through fluid; the diesel engine exhaust fluid injector is used for leading the diesel engine exhaust fluid into the exhaust fluid; the diesel engine exhaust fluid comprises an ammonium hydroxide source; a diesel engine exhaust fluid spraying nozzle is arranged on the upstream of at least one turbine blade. The system can be implemented without using a diesel engine oxidation catalyst.
Description
Technical field
The present invention relates to improve the efficiency of exhaust after treatment system, particularly relate to by be pre-mixed diesel exhaust gas fluid (diesel emission treatment fluid, diesel exhaust fluid) in the turbine of turbosupercharger and improve selective catalytic reduction effect.
Background technique
Emission standard for internal-combustion engine has become stricter in recent years.Environmental problem impels global many countries to carry out stricter engine exhaust requirement.Therefore the exhaust after treatment system that, the noxious pollutant producing in combustion reaction is changed into less harmful by product becomes more general.
Generally speaking, emission request changes according to the type of motor.For example,, for example, for emission test monitoring discharges from offgas duct conventionally carbon monoxide, the nitrogen oxide (NO of the motor of ignition by compression (, take the motor that diesel engine is power)
x) and the concentration of unburned hydrocarbon (UHC), with the concentration of these compounds of guaranteeing to leave offgas duct within certain emission standard.As for reducing NO
xdischarge, comprise the NO of selective catalytic reduction (SCR) component (component)
xreducing catalyst is used to by NO
x(NO of certain ratio and NO
2) change into N
2with other compounds.
Conventional SCR component utilize diesel exhaust gas fluid (DEL) (for example, ammonia) as reagent (reagent) with reductive NO
x.When appropriate ammonia is present in the exhaust stream (exhaust gas stream) at SCR catalyzer place, ammonia is consumed (oxidation) and NO in reaction
xbe reduced.But it may be difficult accurately controlling the amount of the ammonia in exhaust stream and disperse.Although can utilize anhydrous ammonia, anhydrous ammonia is poisonous and is difficult to safe storage.Ammoniacal liquor and urea can be used as reducing agent, because the storage of this compound is than anhydrous ammonia safety.The storage of the urea consisting of two kinds of primary amine groups by carbonyl combination is safest, and still, urea must thermolysis ammonification and vaporization before the reagent as in SCR is oxidized.
Due to catalytic reaction (for example, SCR) degree of dispersion that selectivity and general reaction depend primarily on reactant (reactant) on whole catalyst surface and reagent (for example, stoichiometric proportion), therefore, fully mixing and spread DEF is critical to the success for SCR in exhaust stream.The after-treatment system of the conventional SCR parts (component) that utilize ammonia promotion generally includes DEF sparger and DEF mixer, is respectively used to DEF introduce and vaporize/be distributed in exhaust stream.Therefore,, although conventional DEF mixer is important for realizing SCR, DEF mixer brings extra cost and complexity to conventional after-treatment system, and easily accumulates urea deposits thing.
Summary of the invention
The application's theme, according to the present situation of related domain, be researched and developed with needing according to the problem of related domain specifically, and these problems of related domain also do not solve by current available exhaust after treatment system completely with needing.A problem relevant with the exhaust after treatment system of prior art be utilize independently (stand alone) mixer disperse with mixing exhaust stream in the efficiency of DEF low and difficult.
Therefore, developed the application's theme so that exhaust after treatment system to be provided, it utilizes turbine in turbosupercharger as DEF mixer, therefore at least overcomes some shortcomings in prior art systems.Present disclosure relates to engine aftertreatment system, and this after-treatment system comprises the gas exhaust manifold receiving from the exhaust stream of motor, comprises the turbosupercharger of turbine, and this turbine has blade and the turbine shroud being communicated with exhaust stream fluid.System also comprises the diesel exhaust gas fluid ejector of diesel exhaust gas fluid being introduced to exhaust stream, and diesel exhaust gas fluid comprises that ammoniacal liquor source and diesel exhaust gas stream sparger are arranged on the upstream of at least one turbine blade.
Diesel exhaust gas fluid ejector can be arranged to diesel exhaust gas fluid to introduce gas exhaust manifold.In another embodiment, diesel exhaust gas fluid ejector is configured to diesel exhaust gas fluid to introduce turbine shroud.Turbine shroud also can be directly connected in gas exhaust manifold.System can further include the selective catalytic reduction parts that are positioned at turbine downstream.In one embodiment, system can not comprise that diesel oxidation catalyst and/or system can not comprise particle filter.Engine aftertreatment system can also comprise the diesel exhaust gas fluid source that is connected in diesel exhaust gas fluid ejector via diesel exhaust gas fluid supply tube road, diesel exhaust gas fluid cooling subsystem, high pressure gas recirculation conduit and low pressure exhaust recirculation conduit.
The feature of the description of disclosure theme, structure, advantage and/or characteristic can combinations in any suitable manner in one or more embodiments and/or device.In the following description, provide many concrete details, to fully understand theme of the present disclosure.Those skilled in the relevant art will recognize that, in the situation that do not have wherein one or more of specific feature, details, parts, material and/or method of specific embodiment or device can implement theme of the present disclosure.Other in the situation that, in some embodiment and/or device, will appreciate that the supplementary features and the advantage that may be not in all embodiments or device, exist.And the aspect of theme of the present disclosure is smudgy for fear of making, be not shown specifically in some cases or describe structure, material or the operation of knowing.The feature and advantage of disclosure theme will become apparent more fully according to description and appended claim below, or understand by being implemented in the theme of the present disclosure hereinafter proposing.
Accompanying drawing explanation
In order to be easier to understand the advantage of theme of the present invention, with reference to specific embodiment illustrated in the accompanying drawings, provide the description more specifically of the simple and clear theme of describing above.Therefore should be appreciated that these accompanying drawings only illustrate the exemplary embodiments of this theme, be not considered to restriction on its scope, this theme is by by utilizing additional characteristic for accompanying drawing (specificity) and details describe and illustrate, wherein:
Fig. 1 is according to the block schematic diagram of an embodiment's exhaust after treatment system, and this system comprises and is configured to DEF to be ejected into the DEF sparger in gas exhaust manifold;
Fig. 2 is according to the block schematic diagram of an embodiment's exhaust after treatment system, and this system comprises and is configured to DEF to be ejected into the DEF sparger in turbine shroud;
Fig. 3 is according to the block schematic diagram of an embodiment's exhaust after treatment system, and this system comprises DEF sparger and the single discharging unit for discharging that is arranged on turbine blade upstream, specifically SCR parts; And
Fig. 4 is according to the block schematic diagram of an embodiment's exhaust after treatment system, and this system comprises the DEF sparger that is arranged on turbine blade upstream and a plurality of discharging unit for discharging that comprise SCR parts.
Detailed Description Of The Invention
Fig. 1 is the block schematic diagram of internal-combustion engine system 10, and this internal-combustion engine system 10 comprises exhaust after treatment system 100, and this exhaust after treatment system 100 has and is configured to DEF to be ejected into the DEF sparger 134 in gas exhaust manifold 114.According to an embodiment, system 10 comprises the internal-combustion engine 110 that is connected in intake manifold 111 and gas exhaust manifold 114.Intake manifold 111 and gas exhaust manifold 114 are respectively used to air-flow be supplied to the cylinder of internal-combustion engine 110 and receive air-flow from the cylinder of internal-combustion engine 110.Motor 110 can be the compression-ignition engine such as diesel-fueled engine, or such as the spark-ignition internal combustion engine of gasoline engines.
Internal-combustion engine system 10 comprises admission line 112, and it introduces internal-combustion engine 110 by air 113 from atmosphere via intake manifold 111.Admission line 112 can comprise a series of pipes or the conduit that guiding air 113 flows through.What be connected with admission line 112 and be communicated with air 113 fluids is the compressor 124 of the turbosupercharger 120 of exhaust after treatment system 100.In general, air 113 substantially has atmospheric pressure when entering admission line 112.Air in admission line 112 is compressed by compressor 124, to increase pressure and the density of air before being introduced into motor 110.Compressor 124 is driven rotatably by the turbine 122 of turbosupercharger 120, and turbine itself is driven by the exhaust stream 116 from motor 110.Although do not illustrate, admission line 112 can comprise the air-cooler of the air before cooling be introduced in motor 110.In the whole disclosure, term " air " 113 and term " exhaust stream " 116 refer to respectively mobile fluid in admission line 112 and exhaust duct 115 conventionally.In other words, when this fluid flows through different parts, compression, the pressure and temperature of air 113 and exhaust stream 116 can change in whole system 100.
Before fuel is burned in motor 110, be added to air.Fuel can (for example, in intake manifold 111) be added to air before air enters compressor 124, after air leaves compressor but before entering motor 110, or after air enters motor, via one or more fuel injector (not shown), directly enters the firing chamber of motor 110.In general, fuel is supplied with from fuel tank, and via petrolift, passes through the pumping of delivery of fuel system before in being injected into system.No matter that fuel is directly injected in firing chamber or is ejected into the air upstream of motor, the fuel and air (and the exhaust of some potential recirculation that mix, below seeing) by compression ignition systems, lighted a fire and burnt in some applications, and by spark ignition system, lighted a fire and burn in other application.The burning of fuel produces the exhaust 116 that is operationally discharged to gas exhaust manifold 114 and exhaust duct 115.
Generally speaking, after-treatment system 100 is configured to receive the exhaust stream 116 being produced by internal-combustion engine 110, processes exhaust stream 116 to remove various chemical compounds and particle emission, and then processed exhaust stream 116 is discharged in atmosphere.Exhaust duct 115 can comprise a series of pipes or the conduit that directed exhaust stream 116 flows through.As directed, exhaust duct 115 comprises the turbine 122 of turbosupercharger 120.As mentioned above, for example, from energy drives (rotating) turbine 122 of exhaust stream 116 heating and pressurization, and so rotary compression machine 124.Therefore, leave the energy of exhaust stream 116 of turbine 122 and pressure lower than the energy and the pressure that enter the exhaust stream 116 of turbine 122.For this reason, the exhaust stream 116 that flows to turbine 122 from motor 110 by exhaust duct 115 is considered to high pressure (HP) exhaust stream, and the exhaust stream 116 that flows to offgas duct from turbine by exhaust duct 115 is considered to low pressure (LP) exhaust stream.
System 100 can also comprise HP exhaust gas recirculatioon (EGR) pipeline 117 and LP EGR pipeline 118.HP and LP EGR pipeline 117,118 are both configured at least part of exhaust gas recirculatioon in gas exhaust manifold/exhaust duct to get back to the intake manifold/admission line/firing chamber of motor 110.As shown, HP and LP EGR pipeline 117,118 are directed to admission line 112 and/or intake manifold 111 by part exhaust stream 116.In an illustrated embodiment, HP EGR pipeline 117 is connected in intake manifold 111 in the downstream of compressor 124, and LPEGR pipeline 118 is connected in admission line 112 in the upstream of compressor 124.In other embodiments, HP and LP EGR pipeline 117,118 can be connected to other positions on admission line 112, and in some cases, one or more cylinders that can be directly connected in motor 110 of HP and LP EGR pipeline.Each of HP and LP EGR pipeline 117,118 comprises relevant controllable valve, for example, to guide the controlled part of (, discharging) exhaust stream 116 to turn back in firing chamber via EGR pipeline.
In order to make exhaust flow through LP EGR pipeline 118 from exhaust duct 115, and enter in admission line 112, the ducted exhaust pressure of LP EGR, and therefore the exhaust pressure of the exhaust duct 115 in turbine 122 downstreams must be higher than the pressure of the air 113 in admission line 112.Therefore, LP EGR pipeline 118 can comprise flow regulator (for example, exhaust shutter), and this flow regulator is guaranteed to form necessary pressure reduction between exhaust duct 115 and admission line 112.By closing extraction flow controlling device, less exhaust is passed through, this device is included in the back pressure in exhaust duct 115, and this increases the pressure of the exhaust stream 116 in exhaust duct 115 effectively, therefore forms necessary pressure reduction.According to the pressure of the exhaust of being controlled by flow regulator, the actuating of LP EGR valve can be controlled electronically, so that the exhaust flow rate of the recirculation of expectation and concentration are provided in admission line 112.In certain embodiments, LP EGR exhaust can mix with the air in admission line 112 by air/EGR mixer (not shown).And, although do not illustrate, HP and LP EGR pipeline 117,118, each all can comprise cooler for recycled exhaust gas, with cooling this EGR exhaust before in EGR exhaust is introduced into air-flow.
After-treatment system 100 also can comprise one or more discharging unit for discharging 140, for the treatment of exhaust stream 116(, from exhaust stream 116, removes pollutant), to meet the emission request of regulation.In general, emission request changes according to engine type.As what briefly discuss, for the emission test of ignition by compression (diesel engine) motor, conventionally monitor the release of carbon monoxide, unburned hydrocarbon, diesel engine discharged particle matter such as ash content and charcoal cigarette and nitrogen oxide above.The detail relevant with the various discharging unit for discharging 140 that can provide in native system 100 is included (included) below with reference to figure 3 and Fig. 4.Specifically, Fig. 3 comprises the details relevant with SCR, and Fig. 4 comprises the details relevant with other reprocessing discharging unit for discharging 140, for example oxidation catalyst, particle filter, and ammoxidation catalyst (AMOX), and according to an embodiment, they can be incorporated to system 100.
As shown in Figure 1, system can also comprise DEF source 130, DEF supply line 132 and DEF sparger 134.As briefly described above, DEF source can be with ammonia or case or the container of filling such as the ammonia precursor of urea.Ammonia is used as the reagent in SGR reaction (discussing in more detail with reference to figure 3 below).Although conventional exhaust after treatment system can comprise DEF source, these systems need independently mixer conventionally, so that liquid D EF is vaporized and to be mixed in exhaust stream.In the present invention, not that independently mixer is installed, but DEF service 132 is fed to DEF in DEF sparger 134 according to certain route, this DEF sparger 134 is configured to DEF to be distributed in the gas exhaust manifold 114 of turbine 122 upstreams, therefore utilizes turbine as mixer/vaporizer.Ammoniacal liquor also can be used as reducing agent, because more safer than anhydrous ammonia for storing it.The storage of the urea consisting of two kinds of primary amine groups by carbonyl combination is safest, but urea must be thermal decomposited and be hydrolyzed before the reagent as in SCR is oxidized.
Because compare with conventional system, the DEF of native system 100 more closely sprays to motor 110, so the temperature of gas exhaust manifold 114 and exhaust duct 115 is higher, so this reduces the gathering of harmful urea/ammonia sediments on gas exhaust manifold 114 and exhaust duct 115 internal surfaces.In system 100 disclosed by the invention, DEF source 130, service 132 and sparger 134 can need extra cooling subsystem (for example, ooling channel) to DEF is remained on to suitable temperature.And because DEF sparger 134 more approaches motor 110 than traditional system, higher temperature can further promote vaporization, hydrolysis and the decomposition of urea.And according to the structure of turbosupercharger 120, turbine 122 can provide for DEF the incorporation time of prolongation, to mix equably with exhaust stream 116.DEF longer residence time in turbine 122 also promotes decomposition completely and the hydrolysis of urea.
Fig. 2 is according to the block schematic diagram of an embodiment's the internal-combustion engine system that comprises exhaust after treatment system 200 20, and this exhaust after treatment system 200 has and is configured to DEF to be ejected into the DEF sparger 134 in turbine shroud (housing is not shown).As shown in the figure, DEF sparger 134 can be fixed on turbine shroud and can be configured to and directly DEF is ejected in turbine 122.If DEF is at least injected in system 200 in the upstream of some blade (not shown) of turbine 122, sparger 134 can be positioned in the import of more close turbine 122 or in the position along this housing.In another embodiment (not shown), sparger 134 can be arranged between gas exhaust manifold 114 and turbine 122.For example, in one embodiment, DEF sparger 134 can be fixed on and make gas exhaust manifold 114 and the interconnected intermediate conductor/pipe part of turbine 122.The type of DEF sparger 134 and technical specification can be selected and consider that those of ordinary skill in the related art will recognize that the sparger that can use which kind of sparger or which kind of type according to the disclosure according to the characteristic of setter.
Fig. 3 is according to the block schematic diagram of an embodiment's the internal-combustion engine system that comprises exhaust after treatment system 300 30, this exhaust after treatment system 300 has DEF sparger 134 and the single discharging unit for discharging 140 that is arranged on turbine blade upstream, and SCR parts 142 specifically.As superincumbent background parts is described briefly, the selectivity of catalytic reaction and total reactivity be decided by---except other factors---and in the suitable distribution (ratio) of reactant (reactant) and the reagent of catalyst surface.Therefore, DEF is entering while mixing in turbine 122 before SCR parts 142, and DEF is dispersed in whole exhaust stream 116 substantially, therefore can realize effective SCR reaction.Under suitable condition, when can just access suitable ammonia amount on SCR catalyzer time, the in the situation that of there is catalysis material on SCR catalyzer, ammonia is used for reductive NO
x.In some devices, the catalysis material of SCR parts 142 is vanadium sills, and in other device, catalysis material is zeolite based materials.
In one embodiment, not only than installing, independently mixer energy efficiency is higher in turbine mixing, and turbine-type mixer allows larger process control, because form less urea deposits thing when mixer (turbine 122) relatively approaches motor 110, and the minimizing amount of (because of carelessness) unreacted DEF by SCR parts 142 inadvertently that is uniformly distributed of DEF.This by being undesirable, because if unique discharging unit for discharging 140 that SCR parts 142 are to provide, ammonia can be from the offgas duct discharge of automobile.In another embodiment, ammonia is careless by causing the poisoning or variation of discharging unit for discharging 140 below.
In addition, in certain embodiments, the discharging unit for discharging 140 of exhaust after treatment system 100,200,300 does not comprise oxidation catalyst or particle filter.In fact, in such embodiments, whole exhaust after treatment system 100,200,300 does not comprise oxidation catalyst or particle filter.Conventionally, at oxidation catalyst and particle filter downstream injection DEF, because the DEF spraying in other mode can be attached on oxidation catalyst and particle filter, and/or oxidation catalyst may be oxidized undesirably DEF or particle filter and can limit DEF and pass through.Owing to not using in certain embodiments oxidation catalyst or particle filter, at oxidation catalyst, alleviate with the particle filter upstream problem relevant with spraying DEF.By this way, in the situation that turbine is used as mixer, DEF can be in the injected upstream of turbine.
Fig. 4 is according to the block schematic diagram of an embodiment's the internal-combustion engine system that comprises exhaust after treatment system 400 40, and this exhaust after treatment system 400 has the DEF sparger that is arranged on turbine blade upstream and a plurality of effulent parts that comprise SCR parts.In one embodiment, SCR parts 142 can be unique discharging unit for discharging 140 and catalyzer or the filter that does not use other.But in another embodiment, a plurality of discharging unit for discharging 140 also can be provided in the downstream of SCR parts 142.
For example, oxidation catalyst 144 can be provided in exhaust after treatment system with at least some particulate matters in oxidation exhaust stream 116 and reduces in exhaust stream 116 unburned hydrocarbon and CO to reduce the harmful compound of environment.In order to remove particulate matter, particulate matter (PM) filter 146 also can be arranged on oxidation catalyst 144 downstream or with oxidation catalyst 144 gangs.
Oxidation catalyst 144 can be any of various flowing through known in the art (flow-through) oxidation catalyst, for example, be used in the diesel oxidation catalyst (DOC) in the application that diesel engine is power.In general, oxidation catalyst 144 is configured to be oxidized at least some particulate matters, for example, and the solvable organic moiety of charcoal cigarette in exhaust, and reduce unburned hydrocarbon and CO in exhaust, to reduce the compound that environment is harmful.For example, oxidation catalyst 144 can reduce hydrocarbon and the emission standard of CO concentration to meet the demands in exhaust fully.Oxidation catalyst 144 can comprise the catalyst bed that is exposed to the exhaust stream 116 that flows through exhaust duct 115.Catalyst bed comprises the catalyst layer being arranged in mesosphere or carrier layer.This mesosphere can comprise any various materials (for example, oxide) of the catalyst layer that can suspend therein.Catalyst layer is made by one or more catalysis materials of selecting, with exhaust stream 116 in one or more pollutants react (for example, oxidation).The catalysis material of oxidation catalyst 144 can comprise any various material, for example precious metal (for example, platinum, palladium and rhodium) and other materials (for example, transition metal cerium, iron, manganese and nickel).And catalyst material relative to each other can have any various ratio, for example, for being oxidized and reducing relative quantity and the type of pollutant, unburned hydrocarbon and CO---as expected.
The downstream that after-treatment system 400 can also be included in oxidation catalyst 144 is arranged on the PM filter 146 in exhaust duct 115.PM filter 146 can be any various particle filters known in the art.Conventionally, PM filter 146 is configured to reduce the concentration of the particulate matter (for example, charcoal cigarette) in exhaust stream 116, with the emission standard meeting the demands.PM filter 146 be designed to catch can be by plan recovery event by the particulate matter component of burning-off.PM filter optionally can be arranged in the exhaust duct 115 of the downstream of LP EGR pipeline 118 rather than the upstream of pipeline 118.In certain embodiments, exhaust after treatment system 400 can be included in LP EGR pipeline 118 upstream (for example import of LP EGR pipeline, starting point, inspiration point) PM filter and at the PM filter (not shown) in the downstream of LP EGR pipeline 118.In another other embodiment's (not shown), additional PM filter can be arranged in LP EGR pipeline 118.
The various negative effects of passing through in order to reduce ammonia, after-treatment system 400 can comprise the AMOX catalyzer 148 that is arranged on SCR parts 142 downstreams.In another unshowned embodiment, LP EGR pipeline 118 can comprise AMOX catalyzer.In an illustrated embodiment, AMOX catalyzer 148 is arranged on the downstream of PM filter 146.But in other embodiments, AMOX catalyzer can be arranged on the upstream of PM filter 146, and as illustrated in greater detail below, be even integral with PM filter 146.AMOX catalyzer 148 can be any various catalyzer that flow through that are configured to for example, mainly produce with ammonia react (oxidation) nitrogen.Conventionally, AMOX catalyzer 148 is used for removing the ammonia in exhaust, for example, by SCR parts 142 or leave SCR parts 142 and not with exhaust stream 116 in NO
xthe ammonia reacting.
AMOX catalyzer 148 comprises the catalyst bed being exposed in exhaust stream 116, and this exhaust stream 116 flows through LP EGR pipeline 118 and passes through this bed.Catalyst bed comprises mesosphere or carrier layer.Mesosphere can comprise any various materials (for example, oxide) of the catalyst material that can suspend therein.Mesosphere is made by one or more catalysis materials of selecting, with exhaust stream in ammonia react (for example, oxidation).The catalysis material of AMOX catalyzer 148 can comprise any various material, for example noble metal platinum, palladium and rhodium.In some devices, in order to improve ammoxidation to N
2and H
2o rather than NO
xselectivity, AMOX catalyzer 148 can be double-layer catalyst, it has the mesosphere of being made by zeolitic material and platinum group metal (PGM).Zeolitic material can be used the metal exchange such as copper and iron.In other embodiments,
forthe selectivity of AMOX catalyzer 148, catalyzer can be for example to have, by vanadium sill (, V
2o
5) and the double-layer catalyst in the PGM mesosphere of making.
Some EGR pipelines comprise cooler for recycled exhaust gas, for reducing the temperature that flows through the EGR gas of this EGR pipeline.Although cooler for recycled exhaust gas is not shown in an illustrated embodiment, HP and LP EGR pipeline 117,118 one of them or both can comprise cooler for recycled exhaust gas.For example, in one embodiment, LPEGR pipeline 118 can be included in the cooler for recycled exhaust gas in AMOX catalyzer 148 downstreams.Cooler for recycled exhaust gas is set in AMOX catalyzer 148 downstreams and guarantees that the temperature of the exhaust stream 116 by AMOX catalyzer 148 is relatively high, to promote the ammonia conversion capability of AMOX catalyzer 148.In certain embodiments, cooler for recycled exhaust gas is arranged on the upstream of AMOX catalyzer 132.Although lower (cooler) temperature of leaving cooler for recycled exhaust gas and the exhaust by AMOX catalyzer 132 can reduce the conversion of the ammonia in AMOX catalyzer 148.
Although the after-treatment system 400 shown in Fig. 4 comprises a kind of of SCR parts 142, oxidation catalyst 144, particle filter 146 and AMOX catalyzer 148 with specific order, the order of various parts can differently be configured.But SCR parts 142 are by being arranged on tight downstream and the close motor of DEF sparger 134, to DEF sediments is minimized and increase SCR reaction efficiency.
In addition,, in some devices, the parts of after-treatment system can be placed in same housing.In certain embodiments, oxidation catalyst, SCR catalyzer, PM filter and AMOX catalyzer each can be placed in the housing separating separately.But in other embodiments, the one or more of oxidation catalyst, SCR catalyzer, PM filter and AMOX catalyzer can be placed in same housing.For example, the in the situation that of in the same housing of two or more component placement, can be in housing catalyst bed or the filter core laid close to each other.Therefore,, even can find a plurality of parts in same housing, these parts remain physically and are separated from each other (for example, not mutually combining) in housing.Alternatively, one or more parts of vent systems can be combined with other one or more parts, to form the single parts of the difference in functionality that is designed to carry out this bonded block.For example, SCR parts 142 and PM filter 146 can be combined into single SCRF parts.In another embodiment, PM filter 146 and AMOX catalyzer 148 can be combined into single AMOXF parts.
In addition, at an element " connection " in another element in the situation that, the example in this specification can comprise directly and indirectly be connected.Direct connection can be defined as an element and be connected in another element and have some to contact with this another element.Connection can be defined as to be connected between two elements and connect and not directly contact each other indirectly, but between the element being connected, has one or more other elements.Further, as used herein, an element is fixed on to another element and can comprises directly fixing and indirectly fixing.In addition, as used herein, " vicinity " must not mean contact.For example, element can be contiguous another element and not contacting with this element.
With reference to whole specification, " embodiment ", " embodiment " or similarly language mean that concrete feature, structure or the characteristic about this embodiment, described comprise at least one embodiment of the present invention.Phrase in whole specification " in one embodiment ", " in one embodiment " and the similarly appearance of language can be, but need not to be, and all relates to same embodiment.Equally, the use of term " device " means the device having about the described specific features of one or more embodiments of the present invention, structure or characteristic, but under not relevant to indication reverse situation expression, device can be relevant with one or more embodiments.
Theme of the present invention can not depart from Spirit Essence of the present invention and fundamental characteristics with other specific form enforcements.Described embodiment thinks aspect all illustrative and not restrictive.Therefore scope of the present invention is pointed out by claim rather than by description above.Belonging to the implication being equal to of claim and the variation in scope is included in the scope of the invention.
Claims (10)
1. engine aftertreatment system, comprising:
Reception is from the gas exhaust manifold of the exhaust stream of motor;
The turbosupercharger that comprises turbine, described turbine comprises
Turbine blade, wherein said turbine blade is communicated with described exhaust stream fluid, and
Turbine shroud; And
Diesel exhaust gas fluid is introduced to the diesel exhaust gas fluid ejector in described exhaust stream, and described diesel exhaust gas fluid comprises ammoniacal liquor source, and diesel exhaust gas fluid ejector is arranged on the upstream of turbine blade described at least one.
2. according to the engine aftertreatment system of claim 1, wherein said diesel exhaust gas fluid ejector is configured to described diesel exhaust gas fluid to introduce described gas exhaust manifold.
3. according to the engine aftertreatment system of claim 1, wherein said diesel exhaust gas fluid ejector is configured to described diesel exhaust gas fluid to introduce described turbine shroud.
4. according to the engine aftertreatment system of claim 1, wherein said turbine shroud is directly connected in described gas exhaust manifold.
5. according to the engine aftertreatment system of claim 1, also comprise the selective catalytic reduction parts that are arranged on described turbine downstream.
6. according to the engine aftertreatment system of claim 1, wherein in described system, there is not diesel oxidation catalyst.
7. according to the engine aftertreatment system of claim 1, wherein in described system, there is not particle filter.
8. according to the engine aftertreatment system of claim 1, also comprise diesel exhaust gas fluid source and be connected to described diesel exhaust gas fluid source and described diesel exhaust gas fluid ejector between diesel exhaust gas fluid supply tube road.
9. according to the engine aftertreatment system of claim 7, also comprise diesel exhaust gas fluid cooling subsystem.
10. according to the engine aftertreatment system of claim 1, also comprise the exhaust gas recirculatioon pipeline that at least part of described exhaust stream flows through.
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| CN108246098A (en) * | 2018-02-11 | 2018-07-06 | 洪杰 | A kind of novel environment friendly effective catalyst equipment |
| WO2023103469A1 (en) * | 2021-12-07 | 2023-06-15 | 中船动力(集团)有限公司 | Reducing agent evaporation and mixing system for marine diesel engine scr system, and supply method |
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| CN108246098A (en) * | 2018-02-11 | 2018-07-06 | 洪杰 | A kind of novel environment friendly effective catalyst equipment |
| WO2023103469A1 (en) * | 2021-12-07 | 2023-06-15 | 中船动力(集团)有限公司 | Reducing agent evaporation and mixing system for marine diesel engine scr system, and supply method |
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Application publication date: 20140917 |