System, method, and device for locomotive exhaust gas recirculation cooling and catalyst heating

摘要

A method of heating an engine exhaust gas of an engine, including flowing a first exhaust gas at a first temperature within and along internal flow channels of a catalyst brick, and flowing a second exhaust gas at a second, different, temperature around an exterior of the catalyst brick. Heat may be transferred between the gases and the catalyst brick to achieve various operations.

主权项

1. An emission system for an engine having an intake and an exhaust, comprising
an emission control device coupled in the engine exhaust including: an inlet cone configured to receive a first exhaust gas flow; an outlet cone configured to expel the first exhaust gas flow; a housing coupling the inlet and outlet cones, the housing including a plurality of longitudinally positioned catalyst bricks between the inlet cone and the outlet cone, the first exhaust gas flow flowing in parallel through and within the plurality of bricks, an interior of the housing and an exterior of the bricks defining a region within the housing and outside the bricks, the housing further including a plurality of lateral baffles, each baffle having communication holes therein and within the defined region to allow communication within the region; and a housing inlet and a housing outlet in the housing configured to direct a second exhaust gas flow through the defined region, the first exhaust gas flow and second exhaust gas flow maintained separate by the exterior of the bricks; a turbocharger coupled upstream of the emission control device in the engine exhaust, an outlet of the turbocharger leading to the inlet cone of the emission control device; a first exhaust gas recirculation conduit from the engine exhaust upstream of the turbocharger to the housing inlet; and a second exhaust gas recirculation conduit from the housing outlet to the engine intake.