Mixing devices for selective catalytic reduction systems
AssigneeGM Global Technology Operations LLC
InventorsCharles E. Solbrig, Chandrashekhar Joshi, Sherif H. El Tahry, Venkata Subbareddy Kasa
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Abstract
A selective catalytic reduction (SCR) system includes an exhaust pipe for receiving an exhaust gas from an engine. A selective catalytic reduction (SCR) unit is provided downstream of the exhaust pipe. A first mixing element including a meshed body defines a first surface, a second surface, and a plurality of openings extending from the first surface to the second surface. The first surface and second surface are parallel to each other and define an angle relative to a flow direction of the exhaust flow. The angle is less than 90 degrees.
Claims10
A selective catalytic reduction (SCR) system comprising:
- an exhaust pipe for receiving exhaust gas from an engine, wherein the exhaust pipe defining a longitudinal axis parallel to a flow of the exhaust gas;
- an SCR catalyst provided downstream of the exhaust pipe;
- and
- a device for mixing a dosing agent injected by the SCR system and the exhaust gas,
- wherein
- the device including (i) a first plate disposed longitudinally within the exhaust pipe and (ii) a second plate disposed longitudinally within the exhaust pipe and spaced downstream from the first plate,
- an upstream end of the second plate is spaced apart from a downstream end of the first plate with respect to the longitudinal axis,
- the first plate or the second plate extends through a center of a first cross-sectional area of the exhaust pipe, and
- the first cross-sectional area is in a first plane extending laterally across the exhaust pipe and perpendicular to the longitudinal axis.
A selective catalytic reduction (SCR) system comprising:
- an exhaust pipe for receiving exhaust gas from an engine, wherein the exhaust pipe defining a longitudinal axis parallel to a flow of the exhaust gas;
- an SCR catalyst provided downstream of the exhaust pipe;
- and
- a device for mixing a dosing agent injected by the SCR system and the exhaust gas,
- wherein
- the device including (i) a first plate disposed longitudinally within the exhaust pipe and (ii) a second plate disposed longitudinally within the exhaust pipe and spaced downstream from the first plate,
- an upstream end of the second plate is spaced apart from a downstream end of the first plate with respect to the longitudinal axis,
- the first plate and the second plate extend through a centerline of the exhaust pipe, and
- the centerline extends longitudinally along the exhaust pipe and through a point at a center of a cross-sectional area of the exhaust pipe.
A selective catalytic reduction (SCR) system comprising:
- an exhaust pipe for receiving an exhaust gas from an engine, wherein the exhaust pipe defining a longitudinal axis parallel to a flow of the exhaust gas;
- an SCR catalyst provided downstream of the exhaust pipe;
- and
- a device for mixing a dosing agent injected by the SCR system,
- wherein
- the device includes a first plate disposed longitudinally within the exhaust pipe and is arranged at less than or equal to a predetermined angle from parallel to the longitudinal axis,
- the predetermined angle provides for a predetermined pressure drop across the device,
- the first plate includes a plurality of openings and a plurality of tabs,
- the plurality of tabs are connected to and extend outward from a side of the first plate,
- the plurality of openings and the plurality of tabs collectively form a grid pattern, and
- a total number of tabs included on the first plate is less than a total number of openings in the first plate, such that some of the plurality of openings do not have a corresponding one of the plurality of tabs.
Dependencies are inferred from the claim text.