Counter-flow reactant mixing for exhaust gas aftertreatment
AssigneeProventia Oy
InventorsEero Kotimäki, Jukka Kurikka, Aki Kärnä, Tuomas Tyni
Life of this patent
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Abstract
A mixer and a method therein, including feeding a rotating flow of exhaust gas in a mixing pipe towards a turning end of a mixing chamber; dosing reactant by a doser against the rotating flow around a centreline of the mixing pipe; maintaining a guide around the doser such that a front face of the guide faces the rotating flow, and the guide defines a central opening surrounding the doser; guiding a side flow out of the rotating flow to a carrier flow around the doser via the central opening; and inhibiting by the guide turbulence from being transferred from the side flow to the carrier flow.
Claims17
A method in a mixer, comprising:
- feeding a rotating flow of exhaust gas in a mixing pipe towards a turning end of a mixing chamber;
- dosing reactant by a doser against the rotating flow around a centreline of the mixing pipe;
- maintaining a guide around the doser such that a front face of the guide faces the rotating flow, and the guide defines a central opening surrounding the doser;
- guiding a side flow out of the rotating flow to a carrier flow around the doser via the central opening;
- and
- inhibiting by the guide turbulence from being transferred from the side flow to the carrier flow.
A mixer for exhaust gas aftertreatment, comprising:
- a feed configured to feed a rotating flow of exhaust gas in a mixing pipe towards a turning end of a mixing chamber;
- a doser configured to dose reactant against the rotating flow around a centreline of the mixing pipe;
- a guide around the doser such that a front face of the guide faces the rotating flow, and the guide defines a central opening surrounding the doser;
- the guide comprising a passage structure for guiding a side flow out of the rotating flow to a carrier flow around the doser via the central opening;
- and
- the passage structure being configured to inhibit turbulence from being transferred from the side flow to the carrier flow.
Dependencies are inferred from the claim text.