EXHAUST-GAS AFTERTREATMENT DEVICE WITH CATALYTIC CONVERTER AND MIXING DEVICE

The invention relates to an exhaust-gas aftertreatment device (1) comprising at least one SCR catalytic converter (SCR), upstream of which, as viewed in a flow direction of an exhaust-gas flow (2) of an internal combustion engine, there is positioned at least one mixing device (8) by means of which...

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Bibliographische Detailangaben
Hauptverfasser:	KOWALSKI, Jan, HAAS, Frank, SEEGER, Martin
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	The invention relates to an exhaust-gas aftertreatment device (1) comprising at least one SCR catalytic converter (SCR), upstream of which, as viewed in a flow direction of an exhaust-gas flow (2) of an internal combustion engine, there is positioned at least one mixing device (8) by means of which reducing agent is introduced into the exhaust-gas flow (2), wherein the mixing device (8) comprises at least the following: a housing (5) with an exhaust-gas inlet opening (20) into which the exhaust-gas flow (2) is introduced and with an exhaust-gas outlet opening (22) from which the exhaust-gas flow (2) is discharged, an outer pipe (18), which is received with at least one part in the interior of the housing (5) and/or which, with at least one part, forms at least one part of the housing (5), an inner pipe (26) which is arranged within the outer pipe (18) and which has multiple passage openings (34) in the pipe wall thereof and which has a first axial end (30), which first axial end forms an outlet and is connected in terms of flow to the exhaust-gas outlet opening (22), a chamber (32) which is formed radially between the inner pipe (26) and the outer pipe (18) and which is connected in terms of flow to the exhaust-gas outlet opening (22), an injection means (12) through which reducing agent passes into a second axial end (28) of the inner pipe (26). Here, it is provided that at least a part of the exhaust-gas flow (2) introduced into the exhaust-gas inlet opening (20) is introduced substantially axially into a cross-sectional area of the second axial end (28), which forms an inlet, of the inner pipe (26), wherein a part of said exhaust-gas flow flows along the inner pipe (26) in the axial direction through the interior of the inner pipe (26), and that at least a part of the exhaust-gas flow (2) that has flowed into the interior of the inner pipe (26) via the cross-sectional area of the second axial end (28) flows radially outward through the passage openings (34) of the inner pipe (26) into the chamber (32).