An aftertreatment system for treating constituents of an exhaust gas includes: a housing defining a first internal volume and a second internal volume; an oxidation catalyst in the first internal volume and extending along a first axis, the oxidation catalyst configured to receive at least a portion of the exhaust gas via an inlet conduit fluidly coupled to the oxidation catalyst; a filter in the first internal volume and extending along a second axis parallel to and offset from the first axis, wherein an outlet of the filter is disposed within the second internal volume and configured to emit the exhaust gas into the second internal volume; at least one selective catalytic reduction (SCR) catalyst in the second internal volume and extending along a third axis that is perpendicular to the first axis; and a decomposition tube in the second internal volume in a direction parallel to the third axis.

A selective catalytic reduction including a decomposition section including an intake chamber, with a swirl generating plate disposed in an internal volume of the intake chamber. The swirl generating plate includes a curved sidewall, a first end defining an opening, and a second end. The curved sidewall is oriented substantially normal to the direction of an intake flow of exhaust gas and a convex surface of the curved sidewall is oriented to face the direction of the intake flow. The swirl generating plate is configured to divide the intake flow into a first flow portion flowing through the opening, a second and a third flow portion which are directed substantially normal to the direction of intake flow and the flow direction of the first flow portion, and in opposite directions to each other towards a backwall of the intake chamber so as to create opposing swirls.

A honeycomb structure including: a pillar-shaped honeycomb structure body, the honeycomb structure body being configured to include a circumferential portion and a central portion, wherein a shape of the cells is a triangle or a hexagon having at least one symmetrical axis, in the shape of the cells, a number of the symmetrical axes is defined as A, a number of vertices of the shape of the cells is defined as N, and a value shown in a following Equation (1) is defined as 0, an arrangement direction of the cells in the circumferential portion is inclined in a range of 15 to +15 with respect to an arrangement direction of the cells in the central portion.

[00001]$\begin{array}{cc}=\frac{180}{A}.Math.\frac{N}{6}& \mathrm{Equation}.Math..Math.\left(1\right)\end{array}$

An exhaust system for a work vehicle includes a selective catalytic reduction (SCR) assembly that includes an SCR module. The SCR module includes a first exhaust flow path and a second exhaust flow path. The SCR assembly also includes an inlet configured to receive a flow of an exhaust solution, to direct a first portion of the exhaust solution to the first exhaust flow path, and to direct a second portion of the exhaust solution to the second exhaust flow path. The SCR assembly further includes an outlet mixer configured to receive the first and second portions of the exhaust solution and to direct the first and second portion of the exhaust solution out of the SCR assembly. The outlet mixer includes one or more features configured to mix the first and second portions of the exhaust solution.

An exhaust gas aftertreatment apparatus for an internal combustion engine, in particular a stationary internal combustion engine having at least one catalyst unit for exhaust gases, which is arranged downstream of the internal combustion engine. Exhaust gases from the internal combustion engine can be taken past the at least one catalyst unit by way of a bypass conduit, and the at least one catalyst unit and the bypass conduit are arranged in a common housing. The housing has at least two separate feed conduits for untreated exhaust gas and at least one outlet conduit for exhaust gas treated by the at least one catalyst unit.

The invention relates to an air cleaner for a vehicle which can be installed on the rear of the vehicle, which includes a suction pipe provided with a slit having a length corresponding to a width of the vehicle, an air pump connected to inside of the suction pipe by a guide pipe, and a filter means connected to the air pump. The air cleaner is operated in a way of sucking exhaust gas and fine dust generated from an exhaust line of the vehicle together with fine dust and dust particles generated around tires of the vehicle during driving of the vehicle, removing them, and then discharging purified air to the atmosphere. The air cleaner can effectively remove the fine dust and various-shaped dust particles directly and indirectly generated from the vehicle, and remarkably reduce generation of fine dust by considerably suppressing diffusion of fine dust into atmosphere.

An inlet for an SCR device including a tube having an upstream end for receiving exhaust gases and a downstream end terminating in a porous wall. A plurality of openings are spaced around the circumference of the tube adjacent the porous wall and a plurality of vanes are formed at a connection junction adjacent one edge of the opening to form vanes extending inward at an acute angle relative to a plane between the connecting junction and the longitudinal axis of the tube. Preferably, the vanes are concave on the surface extending inward to promote more effective mixing.

Catalytic converter unit for an exhaust gas catalytic converter, in particular an SCR catalytic converter unit for an SCR catalytic converter of a marine diesel internal combustion engine, with multiple catalytic converter modules. Each catalytic converter module has a ceramic catalytic converter body through which exhaust gas flows and a metallic casing for the ceramic catalytic converter body. The respective ceramic catalytic converter body is received in the respective metallic casing and is surrounded in certain sections by the latter. The catalytic converter modules are positioned with first flowed-through ends on a support grating. A counter-brace is positioned at the opposite second flowed-through ends of the catalytic converter modules, and the catalytic converter modules are clamped between the support grating and the counter-brace.

Disclosed is an exhaust gas purification apparatus for purifying exhaust gas emitted from an engine and discharges the exhaust gas to an outside, the apparatus including: a body formed with an opening area in which one area is opened; an intake part disposed on one side of the body through which the exhaust gas is introduced; a filter disposed inside the body and capable of entry and exit through the opening area; a body cover capable of covering the opening area; a selective reduction catalyst disposed with the body to reduce nitrogen oxides contained in exhaust gas passing through the filter; and a discharge part through which exhaust gas having passed through the selective reduction catalyst is discharged.

A catalytic reactor (12) including: a first opening (13a) located in a side surface of a catalytic reactor (12); a plurality of catalytic cassettes (14) charged into the catalytic reactor (12) through the first opening (13a) toward a side surface opposed to the first opening (13a) so that the plurality of catalytic cassettes (14) is arranged adjacent to each other; and a fixing member (34) configured to be urged by a first lid member (26) closing the first opening (13a) and to press upper surfaces of the plurality of catalytic cassettes (14). The fixing member (14) is disposed to extend along a direction from the first opening (13a) to the side surface opposed to the first opening (13a).