Patent ID: 8627662
Filing Date: 2014-01-14
Classification: F01N,F02B,F02G,F02M,Y02T

Abstract:
1. A method comprising: expanding a first flow of exhaust gas from a first set of combustion chambers of an engine in a turbine stage of a turbocharger and compressing a flow of air in a compressor stage of the turbocharger; cooling the compressed flow of air using a charge air cooler; directing a first portion of the compressed flow of air to an exhaust gas recirculation cooler and a second portion of the compressed flow of air to an intake manifold of the engine; cooling a flow of exhaust gas from a second set of combustion chambers of the engine in the exhaust gas recirculation cooler by drawing heat into the compressed flow of air; directing the flow of exhaust gas from the second set of combustion chambers back to the engine via the intake manifold in an exhaust gas recirculation passage loop; heating the compressed flow of air flowing out of the exhaust gas recirculation cooler by an auxiliary combustor for providing additional heat required for ensuring the compressed flow of air attains a temperature equal to or greater than the exhaust gas after expansion in the turbine stage; and directing the heated compressed flow of air from exhaust gas recirculation cooler into a power turbine for expansion and further into the turbine stage of the turbocharger.