Modular assembly for aftertreatment system

Abstract

A modular assembly for an exhaust aftertreatment system is provided. The modular assembly includes an inlet portion. The modular assembly also includes a mixing element. The modular assembly further includes a first frusto-conical region diverging from the inlet portion. The modular assembly also includes a selective catalytic reduction assembly provided within a central portion of the housing. The selective catalytic reduction assembly includes a bank of catalysts. The modular assembly further includes a sound suppression element provided within the central portion of the housing and positioned downstream of the selective catalytic reduction assembly. The modular assembly includes a baffle arrangement provided within the central portion of the housing, the baffle arrangement includes a first baffle and a second baffle. The modular assembly also includes a second frusto-conical region converging from the central portion of the housing. The modular assembly further includes an outlet portion connected to the second frusto-conical region.

What is claimed is: 
     
         1 . A modular assembly for an exhaust aftertreatment system, the modular assembly comprising:
 an inlet portion defined by a housing of the modular assembly, the inlet portion configured to connect to an exhaust conduit;   a mixing element positioned within the inlet portion and downstream of a reductant injector with respect to an exhaust gas flow direction;   a first frusto-conical region diverging from the inlet portion;   a selective catalytic reduction assembly provided within a central portion of the housing, the selective catalytic reduction assembly including a bank of catalysts positioned in a vertical arrangement with respect to each other; such that a central axis of each of the bank of catalysts is parallel to a central axis of the exhaust conduit;   a sound suppression element provided within the central portion of the housing and positioned downstream of the selective catalytic reduction assembly; and   a baffle arrangement provided within the central portion of the housing, the baffle arrangement including a first baffle provided upstream of the selective catalytic reduction assembly and a second baffle provided downstream of the sound suppression element, wherein the central portion of the housing containing the baffle arrangement, the selective catalytic reduction assembly, and the sound suppression element has an oblong cross section;   a second frusto-conical region converging from the central portion of the housing; and   an outlet portion connected to the second frusto-conical region.