Exhaust gas aftertreatment systems

An exhaust gas aftertreatment system comprising:

• a housing assembly comprising:
• an upstream housing centered on an upstream housing axis,
• a first inlet tube coupled to the upstream housing and configured to receive a first portion of exhaust gas from the upstream housing,
• a second inlet tube coupled to the upstream housing and configured to receive a second portion of the exhaust gas from the upstream housing,
• a mixing housing coupled to the first inlet tube and the second inlet tube, the mixing housing configured to receive the first portion of the exhaust gas from the first inlet tube and receive the second portion of the exhaust gas from the second inlet tube, and
• a divergent housing configured to receive the exhaust gas from the mixing housing, the divergent housing having a diameter that increases as a distance from the mixing housing increases;
• and
• a reductant delivery system comprising a dosing module coupled to the mixing housing, the dosing module comprising an injector configured to provide reductant into the mixing housing.

An exhaust gas aftertreatment system comprising:

• a housing assembly comprising:
• an upstream housing centered on an upstream housing axis,
• a first inlet tube coupled to the upstream housing, centered on a first inlet tube axis parallel to the upstream housing axis, and configured to receive a first portion of exhaust gas from the upstream housing,
• a second inlet tube coupled to the upstream housing, centered on a second inlet tube axis parallel to the upstream housing axis, and configured to receive a second portion of the exhaust gas from the upstream housing,
• a mixing housing coupled to the first inlet tube and the second inlet tube, the mixing housing configured to receive the first portion of the exhaust gas from the first inlet tube and receive the second portion of the exhaust gas from the second inlet tube, the mixing housing separated from the upstream housing by the first inlet tube and the second inlet tube, and
• a decomposition housing coupled to the mixing housing and configured to receive the exhaust gas from the mixing housing, the decomposition housing having a diameter that is constant and centered on a decomposition housing axis that is coincident with the upstream housing axis;
• and
• a reductant delivery system comprising a dosing module coupled to the mixing housing, the dosing module comprising an injector configured to provide reductant into the mixing housing.

An exhaust gas aftertreatment system comprising:

• a housing assembly comprising:
• an upstream housing centered on an upstream housing axis,
• a first inlet tube coupled to the upstream housing, centered on a first inlet tube axis parallel to the upstream housing axis, and configured to receive a first portion of exhaust gas from the upstream housing,
• a second inlet tube coupled to the upstream housing, centered on a second inlet tube axis parallel to the upstream housing axis, and configured to receive a second portion of the exhaust gas from the upstream housing,
• a mixing housing coupled to the first inlet tube and the second inlet tube, the mixing housing configured to receive the first portion of the exhaust gas from the first inlet tube and receive the second portion of the exhaust gas from the second inlet tube, the mixing housing separated from the upstream housing by the first inlet tube and the second inlet tube, and
• a decomposition housing coupled to the mixing housing and configured to receive the exhaust gas from the mixing housing, the decomposition housing having a diameter that is constant and centered on a decomposition housing axis that is coincident with the upstream housing axis;
• and
• a reductant delivery system comprising:
• a dosing module including an injector;
• and
• a dosing lance coupled to the dosing module and configured to receive reductant from the injector and to provide the reductant into the mixing housing, the dosing lance extending within the mixing housing.