# US 12,006,857 B2 · Method in a flow device for exhaust gas aftertreatment and the flow device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,006,857 B2 - Document ID: US12006857B2 - Status: Granted - Kind: B2 - Application number: 17/858,170 - Filed: 2022-07-06 - Published: 2023-01-12 - Granted: 2024-06-11 - Earliest claimed: 2021-07-06 - Assignees: Proventia Oy - Applicants: Proventia Oy - Inventors: Toni Kinnunen; Arno Amberla; Jukka Kurikka; Tuomas Tyni - Web page: https://patentgrep.com/patent/US12006857B2 ## CPC - F01N 3/2892: {Exhaust flow directors or the like, e.g. upstream of catalytic device} - B01D 53/9431: {Processes characterised by a specific device} - 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 25/3141: {with additional mixing means other than injector mixers} - B01F 25/31423: {with a plurality of perforations in the circumferential direction only and covering the whole circumference} - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 5/04: the devices using kinetic energy - F01N 2240/20: a flow director or deflector - F01N 2470/02: Tubes being perforated - F01N 2610/02: the substance being ammonia or urea - F01N 2610/1453: Sprayers or atomisers; Arrangement thereof in the exhaust apparatus - Y02T 10/12: Improving ICE efficiencies - 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) - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method, flow device and system for method of guiding a flow of exhaust gas for aftertreatment, including receiving exhaust gas into a mixing chamber; supporting a mixing tube mostly in the mixing chamber obliquely to and extending through a peripheral wall of the mixing chamber; supporting by a reactant doser mount a reactant doser that doses reactant to the mixing tube; receiving, by a peripheral exhaust gas entry in the mixing tube, exhaust gas at reactant stream arriving from the doser; and forming by a swirl arrangement, a rotating flow around a mixing tube output and enhancing exhaust gas flow through the mixing tube by forming some pressure around the mixing tube downstream from the peripheral exhaust gas entry. ## Claims ### Claim 1 A flow device for exhaust gas aftertreatment, comprising a mixing chamber; a mixing tube that resides mostly in the mixing chamber and is obliquely supported to a peripheral wall of the mixing chamber; and a reactant doser mount for a reactant doser to dose reactant to the mixing tube; wherein the mixing tube has a peripheral exhaust gas entry configured to receive exhaust gas at reactant stream arriving from the doser, and a mixing tube output; and a swirl arrangement around the mixing tube, configured to form a rotating flow around the mixing tube output and to enhance exhaust gas flow through the mixing tube by forming some pressure around the mixing tube downstream from the peripheral exhaust gas entry, wherein the peripheral exhaust gas entry comprises one or more apertures in the mixing tube, the one or more apertures facing towards incoming exhaust gas and residing peripherally in a sector of at most 180 degrees about a longitudinal axis of the mixing tube. ### Claim 2 (depends on 1) The flow device of claim 1, wherein the mixing tube comprises a first end that extends through the peripheral wall of the mixing chamber; and the first end is closed. ### Claim 3 (depends on 2) The flow device of claim 2, wherein the mixing tube comprises a vestibule defined by the closed first end and a flange spaced apart of the first end; and the peripheral exhaust gas entry resides at least partially at the vestibule. ### Claim 4 (depends on 3) The flow device of claim 3, wherein the mixing tube comprises a second cylindrical or conical guide at the flange. ### Claim 5 (depends on 4) The flow device of claim 4, wherein the second cylindrical or conical guide is peripherally closed. ### Claim 6 (depends on 2) The flow device of claim 2, wherein the mixing tube comprises a first cylindrical or conical guide at the first end. ### Claim 7 (depends on 6) The flow device of claim 6, wherein the mixing tube comprises a vestibule defined by a closed first end of the mixing tube and a flange spaced apart of the first end, and the peripheral exhaust gas entry resides at least partially at the vestibule, and wherein the first cylindrical or conical guide comprises peripheral apertures for receiving exhaust gas from the vestibule. ### Claim 8 (depends on 1) The flow device of claim 1, wherein the mixing tube comprises one or more peripheral apertures downstream from the peripheral exhaust gas entry of the mixing tube. ### Claim 9 (depends on 1) The flow device of claim 1, wherein the mixing tube has an angle or turn dividing the mixing tube into an entry section and an exit section, wherein the exit section is within 5 degrees from parallel with a longitudinal axis of the mixing chamber. ### Claim 10 (depends on 1) The flow device of claim 1, wherein the swirl arrangement comprises two or more guides extending along at least 180 degrees around the inner wall of the mixing chamber. ### Claim 11 (depends on 1) The flow device of claim 1, wherein the two or more guides extend by at least 50% in a longitudinal direction of the mixing chamber downstream to a leading edge of the peripheral exhaust gas entry. ### Claim 12 (depends on 1) The flow device of claim 1, further configured to cause the exhaust gas to flow through the mixing tube free of rotation, while the exhaust gas flowing around the mixing tube is rotated at least at the mixing tube output. ### Claim 13 (depends on 1) A system comprising the flow device of claim 1; and a pre-rotation arrangement configured to induce a swirl in the exhaust gas arriving in the mixing chamber; the pre-rotation arrangement comprising a turbocharger or one or more dedicated swirl elements. ### Claim 14 (depends on 13) The system of claim 13, wherein the pre-rotation arrangement comprises the turbocharger; the system is configured to transfer the exhaust gas to the flow device so that the exhaust gas arrives to the mixing chamber with a residual swirl from the turbocharger; and the swirl arrangement is further configured to enforce the residual swirl. ### Claim 15 (depends on 1) A system comprising two reactant mixing devices; wherein at least one of the reactant mixing devices comprises the flow device of claim 1. ### Claim 16 (depends on 15) The system of claim 15, further comprising a pre-rotation arrangement configured to induce a swirl in the exhaust gas arriving in the mixing chamber, wherein the pre-rotation arrangement comprises a turbocharger or one or more dedicated swirl elements; the system is configured to transfer the exhaust gas to the flow device so that the exhaust gas arrives to the mixing chamber with a residual swirl from the turbocharger; and the swirl arrangement is further configured to enforce the residual swirl. ### Claim 17 A method of guiding a flow of exhaust gas for aftertreatment, comprising receiving exhaust gas into a mixing chamber; supporting a mixing tube mostly in the mixing chamber obliquely to a peripheral wall of the mixing chamber; supporting by a reactant doser mount a reactant doser that doses reactant to the mixing tube; receiving, by a peripheral exhaust gas entry in the mixing tube through one or more apertures in the mixing tube, exhaust gas at reactant stream arriving from the doser, the one or more apertures facing forwards incoming exhaust gas and residing peripherally in a sector of at most 180 degrees about a longitudinal axis of the mixing tube; and forming by a swirl arrangement, a rotating flow around a mixing tube output and enhancing exhaust gas flow through the mixing tube by forming some pressure around the mixing tube downstream from the peripheral exhaust gas entry.