Diffuser plate for an exhaust aftertreatment module
AssigneeCaterpillar Inc.
InventorsMark Lunau Schmid, Eric Paul Spaeth, Raymond U. Isada, Julian Justin
Life of this patent
Estimating the term…
Abstract
An aftertreatment module may include a housing with an inlet port and an outlet port. A selective catalytic reduction catalyst may be disposed between the inlet port and the outlet port. A diffuser plate may be disposed downstream of the inlet port and upstream of the selective catalytic reduction catalysts. The diffuser plate may include a first section including a first degree of porosity and a second section including a second degree of porosity. The first degree of porosity may be greater than the second degree of porosity.
Claims15
An aftertreatment module for treating exhaust of an engine, the aftertreatment module comprising:
- a housing including an inlet port and an outlet port;
- a selective catalytic reduction catalyst being disposed between the inlet port and the outlet port;
- and
- a diffuser plate disposed downstream of the inlet port and upstream of the selective catalytic reduction catalyst, the diffuser plate including a first section at a center portion of the diffuser plate and a second section that surrounds the first section,
- wherein the first section includes a first group of first apertures, each of the first apertures having a same configuration with a first unrestricted cross-sectional area aligned with a surface of the diffuser plate to provide a first unrestricted flow passage through the surface, where the first section is configured to have a first degree of porosity,
- wherein the second section includes a second group of second apertures, each of the second apertures having a same configuration, different from the same configuration of the first apertures, with a second unrestricted cross-sectional area, different from the first unrestricted cross-sectional area, to provide a second unrestricted flow passage through the surface, where the second section is configured to have a second degree of porosity, and
- wherein the first degree of porosity is greater than the second degree of porosity such that the second section provides a greater flow restriction than the first section such that exhaust passing through the diffuser plate is evenly distributed at an output side of the diffuser plate.
Dependencies are inferred from the claim text.