Patent ID: 8656708

Claim:
A burner for an exhaust gas treatment system to treat an exhaust flow from an engine, the burner comprising: an inner housing having a closed upstream end, the inner housing surrounding a primary combustion zone and a secondary combustion zone, the inner housing including a plurality of apertures upstream of the secondary combustion zone for receipt of a first portion of the exhaust flow; an outer housing surrounding the inner housing to define a bypass flow path between the inner and outer housings to bypass a second portion of the exhaust flow around the inner housing outside of the primary and secondary combustion zones, the outer housing including a conically-shaped portion surrounding a portion of the inner housing as well as an exhaust inlet coaxially aligned with an exhaust outlet along a central longitudinal axis; an injector mounted to the conically-shaped portion of the outer housing at a position offset from the central longitudinal axis, the injector being operable to inject fuel into the primary combustion chamber toward the central longitudinal axis; and a mixing zone downstream of the second combustion chamber in receipt of the first and second portions of the exhaust flow.