• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    The present invention relates to a multistage mixer that includes a multistage mixer inlet, a multistage mixer outlet, a first flow device and a second flow device. the inlet of the multistage mixer is configured to receive exhaust gas. the output of the multistage mixer is configured to supply exhaust gas to a catalytic converter. the first flow device is configured to receive the exhaust gas from the inlet of the multistage mixer and receive the reductant so that the reductant is partially mixed with the exhaust gas within the first flow device. the first flow device includes a plurality of main vanes and a plurality of main vane openings. the plurality of main blade openings are interspaced between the plurality of main blades. the plurality of main vane openings are configured to receive the exhaust gas and cooperate with the plurality of main vanes to supply the exhaust gas from the first flow device with a swirl flow.
    公开号:BR112019025324A2
    申请号:R112019025324-6
    申请日:2018-06-05
    公开日:2020-06-23
    发明作者:Z. Liu Gerald；Gerald Z. Liu；Kalyankar Apoorv；Apoorv Kalyankar；Munnannur Achuth；Achuth Munnannur；M. Schmidt Niklas；Niklas M. Schmidt；W. Detra Roy；Roy W. Detra；Chiruta Mihai；Mihai Chiruta
    申请人:Cummins Emission Solutions Inc.；
    IPC主号:
    专利说明:

    [001] [001] The present application claims the benefit, and priority, of US Provisional Patent Application No. 62/515,743, filed on June 6, 2017, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD
    [002] [002] The present application generally refers to the field of exhaust gas treatment systems for internal combustion engines. BACKGROUND OF THE INVENTION
    [003] [003] In internal combustion engines such as diesel engines, nitrogen oxide (NOx) compounds can be emitted in the exhaust. To reduce NOx emissions, a selective catalytic reduction (RCS) process can be implemented to convert NOx compounds into more neutral compounds, such as diatomic nitrogen or water, with the aid of a catalyst and a reductant. The catalyst may be included in a catalyst chamber of an exhaust system, such as that of a vehicle or power generation unit. A reductant such as anhydrous ammonia, aqueous ammonia, diesel exhaust fluid ("DEF" or aqueous urea is typically introduced into the exhaust gas stream before the catalyst chamber. To introduce the reductant into the exhaust gas stream for the RCS process, an RCS system may meter or otherwise introduce the reductant through a metering module that vaporizes or sprays the reductant into a system exhaust pipe. exhaust upstream of the catalyst chamber. The RCS system may include one or more sensors to monitor conditions in the exhaust system. SUMMARY
    [004] [004] In one embodiment, a multistage mixer includes a multistage mixer inlet, a multistage mixer outlet, a first flow device and a second flow device. The inlet of the multistage mixer is configured to receive exhaust gas. The output of the multistage mixer is configured to supply exhaust gas to a catalyst. The first flow device is configured to receive the exhaust gas from the inlet of the multistage mixer and receive the reductant so that the reductant is partially mixed with the exhaust gas within the first flow device. The first flow device includes a plurality of main vanes and a plurality of main vane openings. The plurality of main blade openings are interspaced between the plurality of main blades. The plurality of main vane openings are configured to receive the exhaust gas and cooperate with the plurality of main vanes to supply the exhaust gas from the first flow device with a swirl flow that facilitates mixing of the reductant and the exhaust gas. . The second flow device is configured to receive the exhaust gas and reductant from the first flow device. The second flow device includes a plurality of openings of the second flow device configured to supply exhaust gas and reductant from the second flow device to the catalyst through the outlet of the multistage mixer.
    [005] [005] In another embodiment, a multistage mixer includes a multistage mixer inlet, a multistage mixer outlet and a first flow device. The inlet of the multistage mixer is configured to receive exhaust gas. The output of the multistage mixer is configured to supply exhaust gas to a catalyst. The first flow device is configured to receive exhaust gas from the inlet of the multistage mixer and configured to receive the reductant so that the reductant is partially mixed with the exhaust gas within the first flow device. The first flow device includes a Venturi pump body, a plurality of main vanes, a plurality of main vane openings, a plurality of auxiliary vanes and a plurality of auxiliary vane openings. The Venturi pump casing is defined by a casing inlet adjacent to the inlet of the multistage mixer and a casing outlet adjacent to the outlet of the multistage mixer. The plurality of main vanes are positioned within the Venturi pump housing and adjacent to the outlet of the housing. The plurality of main blade openings are interspaced between the plurality of main blades. The plurality of main vane openings are configured to receive the exhaust gas and cooperate with the plurality of main vanes to supply the exhaust gas from the first flow device with a swirl flow that facilitates mixing of the reductant and the exhaust gas. . The plurality of auxiliary vanes are positioned within the Venturi pump housing and adjacent to the housing inlet. The plurality of auxiliary blade openings are interspaced between the plurality of auxiliary blades. The plurality of auxiliary blade openings are configured to receive the exhaust gas and cooperate with the plurality of auxiliary blades to supply the exhaust gas to the Venturi pump body with a swirl flow that facilitates mixing of the reductant and exhaust gas. .
    [006] [006] In yet another embodiment, a multistage mixer includes a multistage mixer inlet, a multistage mixer outlet and a first flow device. The inlet of the multistage mixer is configured to receive exhaust gas. The output of the multistage mixer is configured to supply exhaust gas to a catalyst. The first flow device is configured to receive the exhaust gas from the inlet of the multistage mixer and receive the reductant so that the reductant is partially mixed with the exhaust gas within the first flow device. The first flow device includes a Venturi pump body, a plurality of main vanes, a plurality of main vane openings and an exhaust gas guide. The Venturi pump casing is defined by a casing inlet adjacent to the inlet of the multistage mixer and a casing outlet adjacent to the outlet of the multistage mixer. The Venturi pump casing includes an exhaust gas guide opening disposed along the Venturi pump casing between the inlet of the casing and the outlet of the casing. The plurality of main vanes are positioned within the Venturi pump housing and adjacent to the outlet of the housing. The plurality of main blade openings are interspaced between the plurality of main blades. The plurality of main vane openings are configured to receive the exhaust gas and cooperate with the plurality of main vanes to supply the exhaust gas from the first flow device with a swirl flow that facilitates mixing of the reductant and the exhaust gas. . The exhaust gas guide is attached to the Venturi pump body around the opening of the exhaust gas guide. The exhaust gas guide is configured to separately receive the exhaust gas and the reducer outside the Venturi pump body, mix the exhaust gas and the reducer received from outside the Venturi pump body in the exhaust gas guide and supplying the mixed exhaust gas and reductant within the Venturi pump body.
    [007] [007] In yet another embodiment, a multistage mixer includes a multistage mixer inlet, a multistage mixer outlet and a first flow device. The inlet of the multistage mixer is configured to receive exhaust gas. The output of the multistage mixer is configured to supply exhaust gas to a catalyst. The first flow device is configured to receive the exhaust gas from the inlet of the multistage mixer and receive the reductant so that the reductant is partially mixed with the exhaust gas within the first flow device. The first flow device includes a Venturi pump body, a plurality of straight flue vanes and an exhaust gas guide. The Venturi pump casing is defined by a casing inlet adjacent to the inlet of the multistage mixer and a casing outlet adjacent to the outlet of the multistage mixer. The Venturi pump casing includes an exhaust gas guide opening disposed along the Venturi pump casing between the inlet of the casing and the outlet of the casing. The plurality of straight flue vanes are positioned within the Venturi pump housing and adjacent to the housing outlet. The plurality of straight flue vanes are configured to interface with the exhaust gas and supply the exhaust gas from the first flow device with a swirl flow that facilitates mixing of the reductant and exhaust gas. The exhaust gas guide is attached to the Venturi pump body around the opening of the exhaust gas guide. The exhaust gas guide is configured to separately receive the exhaust gas and the reducer outside the Venturi pump body, mix the exhaust gas and the reducer received from outside the Venturi pump body in the exhaust gas guide and supplying the mixed exhaust gas and reductant within the Venturi pump body. BRIEF DESCRIPTION OF THE DRAWINGS
    [008] [008] Details of one or more implementations are shown in the attached drawings and in the description below. Other features, aspects and advantages of the disclosure will become apparent from the description, drawings and claims, in which:
    [009] [009] Figure 1 is a schematic block diagram of an exemplary catalytic reduction system that has an exemplary reductant release system for an exhaust system;
    [010] [010] Figure 2 is a cross-sectional view of an exemplary multistage mixer;
    [011] [011] Figure 3 is a cross-sectional view of another multistage mixer;
    [012] [012] Figure 4 is a cross-sectional view of yet another multistage mixer;
    [013] [013] Figure 5 is a cross-sectional view of yet another multistage mixer;
    [014] [014] Figure 6A is a cross-sectional view of yet another multistage mixer;
    [015] [015] Figure 6B is a front view of a flow device for the multistage mixer shown in Figure 6A;
    [016] [016] Figure 6C is a front view of another flow device for the multistage mixer shown in Figure 6A;
    [017] [017] Figure 7 is a representation of the velocity of the exhaust gas flow lines inside a multi-stage mixer;
    [018] [018] Figure 8 is a representation of a distribution of reductant droplets within a multistage mixer;
    [019] [019] Figure 9A is a front view of an exemplary flow device for a multistage mixer;
    [020] [020] Figure 9B is a front view of an example flow device for a multistage mixer;
    [021] [021] Figure 9C is a front view of another flow device for a multistage mixer;
    [022] [022] Figure 9D is a front view of another flow device for a multistage mixer;
    [023] [023] Figure 9E is a front view of another flow device for a multistage mixer;
    [024] [024] Figure 9F is a front view of another flow device for a multistage mixer;
    [025] [025] Figure 9G is a front view of another flow device for a multistage mixer;
    [026] [026] Figure 10A is a cross-sectional view of an exhaust gas guide and a reducer guide for a multistage mixer;
    [027] [027] Figure 10B is a cross-sectional view of another exhaust gas guide and a reducer guide for a multistage mixer;
    [028] [028] Figure 10C is a cross-sectional view of yet another exhaust gas guide for a multistage mixer;
    [029] [029] Figure 10D is a cross-sectional view of yet another exhaust gas guide for a multistage mixer;
    [030] [030] Figure 11A is a front view of yet another flow device for a multistage mixer;
    [031] [031] Figure 11B is a front view of yet another flow device for a multistage mixer;
    [032] [032] Figure 11C is a front view of yet another flow device for a multistage mixer;
    [033] [033] Figure 11D is a front view of yet another flow device for a multistage mixer;
    [034] [034] Figure 11E is a cross-sectional view of yet another multistage mixer;
    [035] [035] Figure 12A is a cross-sectional view of yet another multistage mixer;
    [036] [036] Figure 12B is a cross-sectional view of yet another multistage mixer;
    [037] [037] Figure 13 is a cross-sectional view of yet another multistage mixer;
    [038] [038] Figure 14 is a cross-sectional view of yet another multistage mixer;
    [039] [039] Figure 15 is a cross-sectional view of yet another multistage mixer;
    [040] [040] Figure 16 is a front view of a mixer for a multistage mixer;
    [041] [041] Figure 17 is a cross-sectional view of yet another multistage mixer;
    [042] [042] Figure 18A is a front view of another mixer for a multistage mixer;
    [043] [043] Figure 18B is a front view of another mixer for a multistage mixer;
    [044] [044] Figure 18C is a front view of another mixer for a multistage mixer;
    [045] [045] Figure 19 is a cross-sectional view of yet another multistage mixer;
    [046] [046] Figure 20 is a view of a downstream face of a multistage mixer;
    [047] [047] Figure 21 is a view of an upstream face of a multistage mixer;
    [048] [048] Figure 22A is a side view of yet another mixer for a multistage mixer;
    [049] [049] Figure 22B is another side view of the mixer shown in Figure 22A;
    [050] [050] Figure 23 is a bottom perspective view of yet another mixer for a multistage mixer;
    [051] [051] Figure 24 is a side view of a portion of the mixer shown in Figure 23;
    [052] [052] Figure 25 is a side view of a central part for a multistage mixer;
    [053] [053] Figure 26 is a side view of the central part shown in Figure 25 with a plurality of blades;
    [054] [054] Figure 27 is a rear view of yet another flow device for a multistage mixer;
    [055] [055] Figure 28 is a rear view of yet another flow device for a multistage mixer;
    [056] [056] Figure 29 is a graph for analyzing normalized pressure drop and/or uniformity index associated with a flow device for a multistage mixer;
    [057] [057] Figure 30 is a rear view of yet another flow device for a multistage mixer;
    [058] [058] Figure 31 is a top perspective view of yet another mixer for a multistage mixer;
    [059] [059] Figure 32 is a cross-sectional view of the mixer shown in Figure 31; and
    [060] [060] Figure 33 is a side cross-sectional view of a multistage mixer that includes the mixer shown in Figure 31.
    [061] [061] It should be recognized that some or all of the Figures are schematic representations for purposes of illustration. The Figures are provided for the purpose of illustrating one or more implementations with the explicit condition that they should not be used to limit the scope or meaning of the claims. DETAILED DESCRIPTION
    [062] [062] Below are more detailed descriptions of the various concepts related to, and implementations of, methods, apparatus, and systems for distributing flow in an aftertreatment system. The various concepts presented above and discussed in more detail below can be deployed in a variety of ways, as the concepts described are not limited to any specific way of deployment. Examples of specific implementations and applications are provided primarily for illustrative purposes. Overview
    [063] [063] Internal combustion engines (eg, internal combustion diesel engines, etc.) produce exhaust gases that are often treated within an after-treatment system. This treatment often includes passing the exhaust gases through a catalytic converter. By providing the catalytic converter with an even flow of exhaust gases, the efficiency of the catalytic converter and therefore the aftertreatment system can be increased. Various components, such as deflectors, can be included in an aftertreatment system to alter the flow of exhaust gases into the catalytic converter. Conventional aftertreatment systems implement components that are difficult to scale (eg, for different applications, etc.) in a radial direction (eg, various diameters, etc.) and in an axial direction (eg, various lengths, various component numbers, various component configurations, etc.). For example, baffles can have complicated shapes that require advanced manufacturing techniques, and therefore substantial cost, to produce. As a result, conventional aftertreatment systems do not offer the flexibility needed to be easily implemented in applications with different engine power and/or operating conditions. Additionally, conventional after-treatment systems typically use complicated components that are expensive and require difficult and time-consuming manufacturing processes.
    [064] [064] The implementations described herein refer to a multistage mixer that includes a plurality of flow devices that cooperate to provide a catalyst with a substantially uniform flow of exhaust and reductant gases, substantially facilitating uniform distribution of reductant in the gases. downstream of the multistage mixer and provide a relatively low pressure drop (e.g. the pressure of the exhaust gases at the inlet of the multistage mixer minus the pressure of the exhaust gases at the outlet of the multistage mixer, etc. .), all in a relatively compact space compared to conventional aftercare systems. Flow devices are primarily symmetrical and relatively easy to manufacture compared to the complicated devices currently used in aftertreatment systems. As a result, the multi-stage mixer can be easily and quickly scaled up to multiple applications, while consuming less floor space than devices currently used in aftertreatment systems. The multi-stage mixer can be configured to meter the reductant exhaust gases in order to create an internal swirl flow that mixes the reductant within the exhaust gases and creates an even dispersion of the reductant within the uniform flow of the exhaust gases. flowing into the catalyst. The multi-stage mixer can minimize the impact of spray on wall surfaces due to swirl flow and relatively high shear stresses produced by the multi-stage mixer, thereby mitigating deposit formation and buildup within the multi-stage mixer. stages and associated exhaust components.
    [065] [065] In some implementations, the multistage mixer includes an exhaust gas guide that directs the exhaust gases towards the reducer ejected from a reducer guide. Exhaust gases flow into the exhaust gas guide through openings which are arranged over at least part of the exhaust gas guide. The exhaust gases then assist the reductant to travel to a flow device so that the reductant and exhaust gases can subsequently be mixed by means of a swirl flow. Mixing can improve decomposition by utilizing the low pressure created by swirl flow and/or Venturi pump flow, enhance ordinary and turbulent diffusion, and lengthen a mixing path of the exhaust and reductant gases. Whirlpool flow refers to flow that rotates around a central axis of the multistage mixer and/or a central axis of a flow device. Venturi pump flow refers to flow that occurs due to a region of low pressure resulting from a reduction in cross-sectional area and a local flow acceleration.
    [066] [066] In some implementations, a multistage mixer flow device includes internal plates that are positioned under the reducer guide. As the reductant flows into the flow device, the reductant comes into contact with internal plates which facilitate mixing of reductant into the exhaust gases by reducing the reductant Stokes number (e.g. reductant droplets, etc.) by means of splashes. II. Aftertreatment system overview
    [067] [067] Figure 1 depicts an exhaust gas treatment system 100 having an exemplary reductant delivery system 110 for an exhaust system 190. The aftertreatment system 100 includes a particulate filter, for example a diesel particulate filter ("DPF") 102, reductant delivery system 110, a decomposition chamber or reactor 104, an RCS catalyst 106, and a sensor 150. In some embodiments, the RCS 106 catalyst includes an ammonia oxidation catalyst ("ASC" - ammonia oxidation catalyst).
    [068] [068] The DPF 102 is configured to remove particulate matter, such as soot, from the exhaust gases flowing in the exhaust system 190. The DPF 102 includes an inlet, into which the exhaust gas is received, and an outlet, from which the exhaust gas is received. which the exhaust gas exits after having the particulate matter substantially filtered from the exhaust gas and/or after converting the particulate matter to carbon dioxide. In some implementations, DPF 102 may be omitted.
    [069] [069] Decomposition chamber 104 is configured to convert a reductant such as urea or DEF into ammonia. Decomposition chamber 104 includes a reductant delivery system 110 that has a metering or metering module 112 configured to meter reductant into decomposition chamber 104 (e.g., through an injector such as the injector described below). In some implementations, the reductant is injected upstream of the RCS catalyst 106. The reductant droplets are then subjected to evaporation, thermolysis and hydrolysis processes to form ammonia gas in the exhaust system 190. The decomposition chamber 104 includes a inlet in fluid communication with the DPF 102 to receive exhaust gas containing NOx emissions and an outlet for exhaust gas, NOx emissions, ammonia and/or reductant to flow to the RCS 106 catalyst.
    [070] [070] The decomposition chamber 104 includes the dosing module 112 mounted on the decomposition chamber 104 so that the dosing module 112 can dose the reducer to the exhaust gases flowing in the exhaust system 190. The dosing module 112 may include an insulator 114 interposed between a portion of the dosing module 112 and the portion of the decomposition chamber 104 in which the dosing module 112 is mounted. Dosing module 112 is fluidly coupled to one or more reductant sources 116. In some implementations, a pump 118 may be used to pressurize the reductant from reductant sources 116 for delivery to dosing module 112.
    [071] [071] The dosing module 112 and pump 118 are also electrically or communicatively coupled to a controller 120. The controller 120 is configured to control the dosing module 112 to dose the reducer in the decomposition chamber 104. The controller 120 may also be configured to control pump 118. Controller 120 may include a microprocessor, an application-specific integrated circuit ("ASIC"), a field-programmable gate ("FPGA") array. array), etc., or combinations thereof. Controller 120 may include memory which may include, but is not limited to, electronic, optical, magnetic, or any other transmission or storage device capable of providing program instructions to a processor, ASIC, FPGA, etc. The memory may include a memory chip, electrically erasable programmable read-only memory ("EEPROM"), erasable programmable read-only memory ("EPROM"), erasable programmable read-only memory ("EPROM"), memory flash or any other suitable memory from which the controller 120 can read instructions. Instructions can include code from any suitable programming language.
    [072] [072] The RCS 106 catalyst is configured to assist in the reduction of NOx emissions by accelerating a NOx reduction process between ammonia and the NOx of the exhaust gas into diatomic nitrogen and water. The RCS catalyst 106 includes an inlet in fluid communication with the decomposition chamber 104 from which exhaust gas and reductant are received and an outlet in fluid communication with one end of the exhaust system 190.
    [073] [073] The exhaust system 190 may additionally include an oxidation catalyst (e.g., a diesel oxidation catalyst ("DOC")) in fluid communication with the exhaust system 190 (e.g., upstream of the RCS 106 or DPF 102 catalyst) to oxidize hydrocarbons and carbon monoxide in the exhaust gases.
    [074] [074] In some implementations, the DPF 102 can be positioned downstream of the decomposition chamber or reactor 104. For example, the particulate filter 102 and the RCS catalyst 106 can be combined into a single unit. In some implementations, the dosing module 112 may, in turn, be positioned downstream of a turbocharger or upstream of a turbocharger.
    [075] [075] Sensor 150 may be coupled to exhaust system 190 to detect a condition of exhaust gas flowing through exhaust system 190. In some implementations, sensor 150 may have a portion disposed within exhaust system 190; for example, a tip of sensor 150 may extend into a portion of exhaust system 190. In other implementations, sensor 150 may receive exhaust gas through another conduit, such as one or more sample pipes extending to from exhaust system 190. Although sensor 150 is shown as positioned downstream of the RCS catalyst 106, it should be understood that sensor 150 may be positioned in any other position of exhaust system 190, including upstream of DPF 102 , within the DPF 102, between the DPF 102 and the decomposition chamber 104, within the decomposition chamber 104, between the decomposition chamber 104 and the RCS catalyst 106, within the RCS catalyst 106, or downstream of the RCS 106. In addition, two or more sensors 150 may be used to detect an exhaust gas condition, such as two, three, four, five or six sensors 150, each sensor 150 being located in one of the aforementioned positions. exhaust system ionized
    [076] [076] Figure 2 shows a multistage mixer 200 according to an exemplary embodiment. While a multistage mixer 200 is described in this specific embodiment, it is understood that the relevant structure in this and similar embodiments may constitute other post-treatment components, such as an RCS catalyst, a perforated tube, a tube, a piping, a decomposition chamber or reactor, a doser, a dosing module and others. The multistage mixer 200 is configured to receive exhaust gases (e.g., combustion gases from an internal combustion engine, etc.) and supply the downstream exhaust gases with a substantially uniform flow distribution (e.g., profile flow, etc.). According to an exemplary embodiment, the multistage mixer 200 is additionally configured to selectively meter the exhaust gases with a reducer (e.g., urea, diesel exhaust fluid ("DEF"), AdBlue®, etc.). Due to the fact that the multistage mixer 200 provides a substantially uniform flow distribution of the exhaust gases and promotes mixing between the exhaust gases and the reductant, the multistage mixer 200 can also supply the exhaust gases downstream. with a substantially uniform distribution of reducer (e.g. reducer profile, etc.).
    [077] [077] The multistage mixer 200 includes a multistage mixer inlet 202 which receives the exhaust gases in the multistage mixer 200 and a multistage mixer outlet 204 which supplies the exhaust gases from the multistage mixer 200. In accordance with various embodiments, the inlet of the multistage mixer 202 receives exhaust gases from a diesel particulate filter (e.g. the DPF 102, etc.), and the outlet of the multistage mixer 204 supplies the exhaust gases to the RCS 106 catalytic converter.
    [078] [078] Fluid flows can be defined by a Reynolds number, which is related to a fluid flow pattern, and a Stokes number, which is related to the behavior of particles suspended in the fluid. Depending on the Reynolds number, the flow can be, for example, turbulent or laminar. The flow of exhaust gases into the inlet of the multistage mixer 202 can be defined by a Reynolds number that is greater than 104, indicating that the flow of exhaust gases is turbulent. Due to the fact that the flow of exhaust gases into the inlet of the multistage mixer 202 is turbulent, self-similarity exists. Depending on the Stokes number, the particles may be more or less likely to follow the fluid flow. The reductant flow can be defined by a Stokes number that is on the order of one, indicating that the reductant is unlikely to follow the flow of exhaust gases, which causes a problem in conventional mixing devices. Advantageously, the multistage mixer 200 incorporates various components and devices of the present invention that cause the reducer to be mixed with the exhaust gases (e.g., reducing the reducer Stokes number, etc.) so that the reducer is mixed with the exhaust gases. reducer is driven through the multistage mixer 200 together with the exhaust gases. In this way, the multistage mixer 200 improves mixing of the reducer and reduces the risk associated with the formation of deposits within the multistage mixer 200. In various embodiments, the multistage mixer 200 is static and has no moving components. in response to the passage of exhaust gases through the multistage mixer 200. In this way, the multistage mixer 200 can be less complex to manufacture and less expensive, and therefore more desirable than aftertreatment components with components furniture.
    [079] [079] The multistage mixer 200 includes a plurality of flow devices that segment the multistage mixer 200 into a plurality of phases. Each of the plurality of flow devices is structured to alter the flow of the exhaust gases and the reducer so that the plurality of flow devices cumulatively causes the exhaust gases to obtain a target flow distribution and reduces the reducer. to obtain a target uniformity index (e.g., uniformity distribution, etc.) at the output of the multistage mixer 204. Obtaining certain flow distribution and reductant uniformity indices is important in operating a flow system. after treatment. For example, it is desirable to obtain a uniform flow distribution and reductant uniformity index at an inlet of an RCS catalyst, as such a flow distribution allows the RCS catalyst to achieve relatively high conversion efficiency.
    [080] [080] As shown in Figure 2, the multistage mixer 200 includes a first flow device 206, a second flow device 208, a third flow device 210 and a fourth flow device 212. It is understood that the mixer multistage flow device 200 may include any combination of first flow device 206, second flow device 208, third flow device 210 and fourth flow device 212, including combinations with multiple first flow devices 206, multiple second flow devices flow device 208, multiple third flow devices 210 and/or multiple fourth flow devices 212, and combinations without a first flow device 206, a second flow device 208, a third flow device 210 and/or a fourth flow device 212.
    [081] [081] As the exhaust gases enter through the inlet of the multistage mixer 202, before meeting the first flow device 206, the exhaust gases are at stage zero. At stage zero, the exhaust gases still need to be impacted by any of the flow devices. Exhaust gases then flow through the first flow device 206. The first flow device 206 includes a number of openings NI which define an open area AI through which the exhaust gases flow to stage one. The openings of the first flow device 206 are defined by an average area AAI. The first flow device 206 can be configured to produce a Venturi pump effect, swirl effect, or a mixture thereof. The swirl effect can cause a greater part of the flow of exhaust gases to be biased towards a periphery of the multistage mixer 200. The first flow device 206 can create a low pressure region in stage one. This low pressure region can facilitate improved reductant decomposition (e.g. through evaporation,
    [082] [082] Exhaust gases then flow through the second flow device
    [083] [083] According to an exemplary embodiment, the multistage mixer 200 is configured so that:
    权利要求:
    Claims (32)
    [1]
    1. Multi-stage mixer, CHARACTERIZED by comprising: a multi-stage mixer inlet configured to receive exhaust gas, the multi-stage mixer inlet centered on a first central geometric axis; a multistage mixer outlet configured to supply exhaust gas to a catalyst, the multistage mixer outlet centered on a first central axis; a first flow device configured to receive the exhaust gas from the inlet of the multistage mixer and receive the reductant so that the reductant is partially mixed with the exhaust gas within the first flow device, the first flow device being comprises: a plurality of main blades; and a plurality of main vane openings interspaced between the plurality of main vanes, the plurality of main vane openings being configured to receive the exhaust gas and cooperate with the plurality of main vanes to supply the exhaust gas from the first device. flow with a swirl flow that facilitates mixing of the reductant and exhaust gas; and a second flow device configured to receive the exhaust gas and the reductant from the first flow device, the second flow device comprising a plurality of second flow device openings configured to supply the exhaust gas and the reductant to from the second flow device to the catalyst through the outlet of the multistage mixer.
    [2]
    A multi-stage mixer according to claim 1, CHARACTERIZED by: the plurality of main blade openings collectively define a first open area;
    wherein the plurality of second openings of the flow device collectively define a second open area; and where the first open area is equal to the second open area.
    [3]
    3. Multi-stage mixer according to claim 1, CHARACTERIZED in that it additionally comprises an exhaust gas guide coupled to the first flow device, the exhaust gas guide being configured to receive the exhaust gas from the inlet of the multistage mixer and configured to bring the exhaust gas into contact with the reducer so that the reducer is propelled into the first flow device by the exhaust gas.
    [4]
    A multi-stage mixer according to claim 1, CHARACTERIZED in that the first flow device further comprises: a body inlet having a first diameter; an outlet of the body has a second diameter smaller than the first diameter; and a frustoconical sheath contiguous with the exit of the body.
    [5]
    A multistage mixer according to claim 1, CHARACTERIZED in that the first flow device additionally comprises: a plurality of auxiliary blades; and a plurality of auxiliary vane openings interspaced between the plurality of auxiliary vanes, the plurality of auxiliary vane openings configured to receive the exhaust gas and cooperate with the plurality of auxiliary vanes to supply the exhaust gas to the first flow device with a swirl flow that facilitates the mixing of the reductant and the exhaust gas.
    [6]
    6. Multi-stage mixer according to claim 5, CHARACTERIZED in that the swirl flow is an anti-swirl flow.
    [7]
    7. Multistage mixer according to claim 5,
    CHARACTERIZED in that the whirlpool flow is a whirlpool flow.
    [8]
    A multi-stage mixer according to claim 5, CHARACTERIZED in that: the first flow device further comprises: a body inlet; and an exit from the body; and the plurality of auxiliary blades are located adjacent the inlet of the body and the plurality of main blades are located adjacent the outlet of the body.
    [9]
    9. Multi-stage mixer, according to claim 5, CHARACTERIZED in that: the multi-stage mixer is centered on a central geometric axis of the mixer; the first flow device is centered on a central axis of the body; and the central axis of the body is offset or angular with respect to the central axis of the mixer.
    [10]
    A multistage mixer according to claim 5, CHARACTERIZED in that the first flow device further comprises a first support flange configured to secure the first flow device within the multistage mixer, the first support flange configured to establish a seal between the first flow device and the multistage mixer.
    [11]
    A multistage mixer according to claim 10, CHARACTERIZED in that the first flow device further comprises a second support flange comprising: a plurality of openings of the second support flange configured to facilitate the passage of exhaust gas through the same; and a plurality of second support flange connectors configured to secure the first flow device within the multistage mixer.
    [12]
    A multi-stage mixer as claimed in claim 11, CHARACTERIZED in that: the first flow device further comprises: a body inlet; and an exit from the body; and the second support flange is located adjacent the inlet of the body and the first support flange is located adjacent the outlet of the body.
    [13]
    A multistage mixer according to claim 10, CHARACTERIZED in that the first flow device further comprises a first perforated support flange comprising a plurality of first perforations configured to facilitate the passage of exhaust gas therethrough, being the first perforated support flange configured to hold the first flow device within the multistage mixer.
    [14]
    A multistage mixer as claimed in claim 13, CHARACTERIZED in that the first flow device further comprises a second support flange comprising: a plurality of openings of the second support flange configured to facilitate the passage of exhaust gas through the same; and a plurality of second support flange connectors configured to secure the first flow device within the multistage mixer.
    [15]
    15. Multistage mixer according to claim 14, CHARACTERIZED by: the first flow device additionally comprises:
    a body entrance; and an exit from the body; and the second support flange is located adjacent the inlet of the body and the first perforated support flange is located adjacent the outlet of the body.
    [16]
    16. Multi-stage mixer, CHARACTERIZED by comprising: a multi-stage mixer inlet configured to receive exhaust gas; a multistage mixer outlet configured to supply exhaust gas to a catalyst; and a first flow device configured to receive the exhaust gas from the inlet of the multistage mixer and configured to receive the reductant such that the reductant is partially mixed with the exhaust gas within the first flow device, the first being flow device comprises: a Venturi pump body defined by a body inlet adjacent to the inlet of the multistage mixer and an outlet of the body adjacent to the outlet of the multistage mixer; a plurality of main vanes positioned within the Venturi pump body and adjacent to the outlet of the body; a plurality of main vane openings interspaced between the plurality of main vanes, the plurality of main vane openings configured to receive the exhaust gas and cooperate with the plurality of main vanes to supply the exhaust gas from the first flow device with a swirl flow that facilitates the mixing of the reductant and the exhaust gas; a plurality of auxiliary blades are positioned within the Venturi pump body and adjacent to the inlet of the body; and a plurality of auxiliary vane openings interspaced between the plurality of auxiliary vanes, the plurality of auxiliary vane openings being configured to receive the exhaust gas and cooperate with the plurality of auxiliary vanes to supply the exhaust gas to the Venturi pump body with a swirl flow that facilitates the mixing of the reducer and the exhaust gas.
    [17]
    17. Multi-stage mixer, according to claim 16, CHARACTERIZED in that: the multi-stage mixer is centered on a central geometric axis of the mixer; the Venturi pump body is centered on a central geometric axis of the body; and the central axis of the body is offset or angular with respect to the central axis of the mixer.
    [18]
    18. Multi-stage mixer, according to claim 16, CHARACTERIZED by: the Venturi pump body comprises a frustoconical casing contiguous with the outlet of the body; the body inlet has a first diameter; and the outlet of the body has a second diameter smaller than the first diameter.
    [19]
    A multi-stage mixer according to claim 16, CHARACTERIZED in that: the first flow device additionally comprises an exhaust gas guide coupled to the Venturi pump body; the Venturi pump body comprising an exhaust gas guide opening and the exhaust gas guide being positioned around the exhaust gas guide opening; where the exhaust gas guide is configured to separately receive the exhaust gas and the reducer from outside the Venturi pump body, mix the exhaust gas and the reducer received from outside the Venturi pump body in the exhaust gas guide and supplying the mixed exhaust gas and reductant within the Venturi pump body.
    [20]
    20. Multi-stage mixer, CHARACTERIZED by comprising: a multi-stage mixer inlet configured to receive exhaust gas; a multistage mixer outlet configured to supply exhaust gas to a catalyst; and a first flow device configured to receive the exhaust gas from the inlet of the multistage mixer and receive the reducer so that the reducer is partially mixed with the exhaust gas within the first flow device, the first flow device being flow comprises: a Venturi pump body defined by a body inlet adjacent to the inlet of the multistage mixer and a body outlet adjacent to the outlet of the multistage mixer and including an exhaust gas guide opening disposed along the body Venturi pump between body inlet and body outlet; a plurality of main vanes positioned within the Venturi pump body and adjacent to the outlet of the body; a plurality of main vane openings interspaced between the plurality of main vanes, the plurality of main vane openings configured to receive the exhaust gas and cooperate with the plurality of main vanes to supply the exhaust gas from the first flow device with a swirl flow that facilitates the mixing of the reductant and the exhaust gas; and an exhaust gas guide coupled to the Venturi pump body around the opening of the exhaust gas guide, the exhaust gas guide being configured to separately receive the exhaust gas and the reductant from outside the Venturi pump body, mixing exhaust gas and reductant received from outside the pump housing
    Venturi in the exhaust gas guide and supply the mixed exhaust gas and reductant inside the Venturi pump body.
    [21]
    21. Multi-stage mixer, according to claim 20, CHARACTERIZED in that: the multi-stage mixer is centered on a central geometric axis of the mixer; the Venturi pump body is centered on a central geometric axis of the body; and the central axis of the body is offset or angular with respect to the central axis of the mixer.
    [22]
    22. Multi-stage mixer, according to claim 20, CHARACTERIZED by: the Venturi pump body comprises a frustoconical casing contiguous with the outlet of the body; the body inlet has a first diameter; and the outlet of the body has a second diameter smaller than the first diameter.
    [23]
    A multi-stage mixer according to claim 22, CHARACTERIZED in that the Venturi pump body comprises a tapered edge contiguous with the inlet of the body and configured to lead the exhaust gas into the inlet of the body.
    [24]
    A multi-stage mixer according to claim 20, CHARACTERIZED in that: each of the plurality of main blades is coupled to a central part of the main blade; each of the plurality of main blades is defined by a main blade angle with respect to a central axis of the central part of the main blade;
    the main blade angle for each of the plurality of main blades is between zero degrees and forty-five degrees, inclusive; and the main blade angle for each of the plurality of main blades is different from the main blade angle for another one of the plurality of main blades.
    [25]
    25. Multistage mixer, according to claim 24, CHARACTERIZED in that each one of the plurality of main blades is coupled and adapted to the Venturi pump body.
    [26]
    26. Multi-stage mixer, CHARACTERIZED by comprising: a multi-stage mixer inlet configured to receive exhaust gas; a multistage mixer outlet configured to supply exhaust gas to a catalyst; and a first flow device configured to receive the exhaust gas from the inlet of the multistage mixer and receive the reductant so that the reductant is partially mixed with the exhaust gas within the first flow device, the first flow device being flow comprises: a Venturi pump body defined by a body inlet adjacent to the inlet of the multistage mixer and a body outlet adjacent to the outlet of the multistage mixer and including an exhaust gas guide opening disposed along the body Venturi pump between body inlet and body outlet; a plurality of straight flue vanes positioned within the Venturi pump body and adjacent the outlet of the housing, the plurality of straight flue vanes configured to interface with the exhaust gas and supply the exhaust gas from the first flow device with a swirl flow that facilitates the mixing of the reductant and the exhaust gas; and an exhaust gas guide coupled to the Venturi pump body around the opening of the exhaust gas guide, the exhaust gas guide being configured to separately receive the exhaust gas and the reductant from outside the Venturi pump body, mix the exhaust gas and reductant received from outside the Venturi pump housing in the exhaust gas guide and supply the mixed exhaust gas and reductant inside the Venturi pump housing.
    [27]
    27. Multi-stage mixer, according to claim 26, CHARACTERIZED in that: the multi-stage mixer is centered on a central geometric axis of the mixer; the Venturi pump body is centered on a central geometric axis of the body; and the central axis of the body is offset or angular with respect to the central axis of the mixer.
    [28]
    28. Multi-stage mixer, according to claim 26, CHARACTERIZED by: the Venturi pump body comprises a frustoconical casing contiguous with the outlet of the body; the body inlet has a first diameter; and the outlet of the body has a second diameter smaller than the first diameter.
    [29]
    A multi-stage mixer according to claim 28, CHARACTERIZED in that the Venturi pump body comprises a tapered edge contiguous with the inlet of the body and configured to lead the exhaust gas into the inlet of the body.
    [30]
    30. Multi-stage mixer, according to claim 26, CHARACTERIZED by:
    each of the plurality of straight flue blades is coupled to a central portion of the straight flue blade; each of the plurality of straight flue blades is defined by an angle in the flow direction with respect to a central axis of the central part of the straight flue blade; the angle in the flow direction for each of the plurality of straight flue blades is between thirty degrees and ninety degrees, inclusive; and the angle in the direction of flow for one of the plurality of straight flue blades is different from the angle of flow for another blade of the plurality of straight flue blades.
    [31]
    A multistage mixer according to claim 26, FEATURED in that each of the plurality of straight duct vanes is coupled and conforms to the Venturi pump body, so that each of the plurality of straight duct vanes cooperates with the Venturi pump body to form a conduit.
    [32]
    A multi-stage mixer according to claim 26, CHARACTERIZED in that: one of the plurality of straight flue vanes extends over another of the plurality of straight flue vanes for an extension distance; one of the plurality of straight flue blades has a width in the flow direction; and the extension distance is between zero and seventy-five percent, inclusive, of the width in the flow direction of one of the plurality of straight flue blades.
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    同族专利:
    公开号 | 公开日
    US11136910B2|2021-10-05|
    WO2018226626A1|2018-12-13|
    DE112018002876T5|2020-02-20|
    GB2598500A|2022-03-02|
    GB2577212A|2020-03-18|
    CN109414661A|2019-03-01|
    US20210372313A1|2021-12-02|
    GB2577212B|2022-02-16|
    GB201917608D0|2020-01-15|
    US20200123955A1|2020-04-23|
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    优先权:
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