# US 10,245,564 B2 · Dosing and mixing arrangement for use in exhaust aftertreatment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,245,564 B2 - Document ID: US10245564B2 - Status: Granted - Kind: B2 - Application number: 15/650,502 - Filed: 2017-07-14 - Published: 2018-01-04 - Granted: 2019-04-02 - Earliest claimed: 2013-02-15 - Assignees: Donaldson Company, Inc. - Applicants: Donaldson Company, Inc. - Inventors: Korneel De Rudder; Stéphane Le Merdy - Web page: https://patentgrep.com/patent/US10245564B2 ## CPC - B01F 23/2132: {using nozzles} - B01F 25/103: {with additional mixing means other than vortex mixers, e.g. the vortex chamber being positioned in another mixing chamber} - B01F 25/3131: {with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements} - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 3/2892: {Exhaust flow directors or the like, e.g. upstream of catalytic device} - B01F 2025/931: {Flow guiding elements surrounding feed openings, e.g. jet nozzles} - F01N 3/035: with catalytic reactors - F01N 3/0842: {Nitrogen oxides} - F01N 2240/20: a flow director or deflector - F01N 2470/04: characterised by shape, disposition or dimensions of apertures - F01N 2470/18: the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus - F01N 2610/02: the substance being ammonia or urea - Y02T 10/12: Improving ICE efficiencies - B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06) - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method for causing exhaust gas flow to flow at least 270 degrees in a first direction about a perforated tube using a baffle plate having a main body with a plurality of flow-through openings and a plurality of louvers positioned adjacent to the flow-through openings. The method includes deflecting a first portion of the exhaust gas flow with the main body of the baffle plate. The method also includes allowing a second portion of the exhaust gas flow to flow through the flow-through openings of the baffle plate. The method also deflects the second portion of the exhaust gas flow at a downstream side of the main body with the louvers hereby causing the second portion of the exhaust gas flow to flow in the first direction about the perforated tube. ## Claims ### Claim 1 A dosing and mixing arrangement comprising: a housing including a main housing body that defines a central housing axis, the main, housing body having a length that extends along the central housing axis between first and second opposite ends of the main housing body, the housing also including an inlet adjacent the first end of the main housing body and an outlet adjacent the second end of the main housing body; a perforated tube forming the outlet of the housing, the perforated tube defining a tube axis aligned at an angle relative to the central housing axis; the main housing body defining an interior volume that extends between the inlet and the perforated tube, the interior volume defining a transverse cross-sectional area that is transverse relative to the central housing axis; a baffle plate positioned within the interior volume between the perforated tube and the inlet, the baffle plate having a main plate body having a downstream side that faces toward the perforated tube and an upstream side, the main plate body defining a plurality of flow-through openings that extend through the main plate body between the upstream and downstream sides of the main plate body, the baffle plate also including a plurality of louvers positioned adjacent to the flow-through openings of the main plate body; and wherein a first portion of exhaust gas flow through the housing is directed though the open flow area and then in a first rotational direction around the perforated tube, and wherein a second portion of the exhaust gas flow passes through the flow-through openings and is deflected in the first rotation direction about the perforated tube by the louvers. ### Claim 2 (depends on 1) The dosing and mixing arrangement of claim 1, further comprising an exhaust treatment substrate positioned within the main housing body, the baffle plate being positioned between the perforated tube and the exhaust treatment substrate. ### Claim 3 (depends on 1) The dosing and mixing arrangement of claim 1, wherein the open flow area is larger than a total area defined by the flow-through openings. ### Claim 4 (depends on 1) The dosing and mixing arrangement of claim 1, wherein at least 10% of the perforated tube overlaps with the open flow area. ### Claim 5 (depends on 1) The dosing and mixing arrangement of claim 1, wherein the free edge is, parallel to the tube axis. ### Claim 6 (depends on 1) The dosing and mixing arrangement of claim 1, wherein the second end of the main housing body includes a curved portion that curves partially around the perforated tube. ### Claim 7 (depends on 1) The dosing and mixing arrangement of claim 1, further comprising a reactant dispenser for dispensing a reactant within an interior of the perforated tube such that the reactant is mixed with the exhaust gas flow within the interior of the perforated tube. ### Claim 8 (depends on 1) The dosing and mixing arrangement of claim 1, wherein the baffle plate is configured to cause the exhaust gas flow to flow circumferentially in one direction around at least 270 degrees of an exterior of the perforated tube. ### Claim 9 (depends on 1) The dosing and mixing arrangement of claim 1, wherein the baffle plate is curved. ### Claim 10 (depends on 1) The dosing and mixing arrangement of claim 1, wherein the perforated tithe is cylindrical. ### Claim 11 (depends on 1) The dosing and mixing arrangement of claim 1, wherein the perforated tube has a first end being closed by the housing and a second end extending out of the housing. ### Claim 12 (depends on 11) The dosing and mixing arrangement of claim 11, wherein the second end is an open end defining the outlet of the housing. ### Claim 13 (depends on 11) The dosing and mixing arrangement of claim 11, further comprising an exhaust treatment substrate positioned within the main housing body, the exhaust treatment substrate defining a longitudinal axis, wherein the perforated tube defines a central axis extending from the first end to the second end that is generally perpendicular to the longitudinal axis. ### Claim 14 (depends on 1) The dosing and mixing arrangement of claim 1, further comprising a perforated plate defining a plurality of apertures therethrough, the perforated plate being positioned within the housing between the inlet and the baffle plate. ### Claim 15 (depends on 1) The dosing and mixing arrangement of claim 1, further comprising an injector for dispensing a reactant into the exhaust into the interior of the perforated tube. ### Claim 16 (depends on 15) The dosing and mixing arrangement of claim 15, wherein the injector is positioned inside the perforated tube at the first end. ### Claim 17 A dosing and mixing arrangement comprising: a housing defining an interior; a mixing tube disposed within the interior of the housing, the mixing tube having an interior, an exterior, and at least a first portion defining a first plurality of apertures, the first portion surrounding a tube axis of the mixing tube, the tube axis extending between a closed end of the mixing tube and an open end of the mixing tube; and a swirl structure including at least one plate curving partially around the tube axis of the mixing tube, the plate defining a plurality of baffles and a second plurality of apertures positioned adjacent to the baffles, the plate causing exhaust flow to move both around the plate and also through the second plurality of apertures and to swirl outside the exterior of the first portion of the mixing tube in one rotational direction along a flow path that extends at least 270 degrees around a central axis of the mixing tube and into the interior of the mixing tube through the first plurality of apertures. ### Claim 18 (depends on 17) The dosing and mixing arrangement of claim 17, wherein the closed end of the mixing tube is closed by the housing. ### Claim 19 (depends on 17) The dosing and mixing arrangement of claim 17, further comprising a loser mounted to the closed end of the mixing tube.