REDUCED EMISSIONS INTERNAL COMBUSTION ENGINE SYSTEMS

摘要

Internal combustion diesel engine systems and methods of operation are disclosed that include a diesel engine, an exhaust gas recirculation system, a wastegated turbocharger, an exhaust throttle, and a vanadia selective catalytic reduction catalyst downstream of the exhaust throttle.

主权项

1. A method comprising:
operating an internal combustion engine to produce an exhaust gas flow to an exhaust system with a number of exhaust gas treatment and flow control components comprising a vanadia selective catalytic reduction (SCR) catalyst, an exhaust throttle upstream of the vanadia SCR catalyst, and a turbocharger with a controllable wastegate upstream of the vanadia SCR catalyst without an intervening particulate filler between the exhaust throttle and the vanadia SCR catalyst and without an intervening oxidation catalyst between the exhaust throttle and the vanadia SCR catalyst; recirculating a portion of the exhaust gas flow in an exhaust gas recirculation (EGR) conduit, the EGR conduit including an EGR control valve connected with the EGR conduit, the EGR conduit connecting the exhaust system to an intake system to control recirculation of the exhaust gas flow to an intake system; and reducing NOx in the exhaust gas flow passing through the vanadia SCR catalyst by injecting a reductant upstream of the vanadia SCR catalyst, wherein the exhaust gas flow to the passes from the exhaust throttle directly to the vanadia SCR catalyst without passing through a particulate filter or oxidation catalyst.