PM Deposition in an EGR Cooler and Removal of the Deposited PM by Air Flow

Abstract

EGR (Exhaust Gas Recirculation) system with EGR cooler is applied to diesel engines to improve their emission levels. EGR coolers have a problem that the deposition of PM in exhaust gas causes deterioration of their heat exchange performance. In this study, exhaust gas from a diesel engine was introduced into a test EGR cooler, and the deposition of PM in it was investigated experimentally. As a result, the mass of EGR deposit increased with a decrease of the excess air ratio. Moreover, the removal characteristics of the deposited PM by passing through blow-off air were examined.