Effect of SO2 in Recirculated Exhaust Gas on Wear of Diesel Engine. Effect of SO2 Added to Intake Air on Wear.

Abstract

In both spark ignition engines and diesel engines, the exhaust gas recirculation (EGR) system is well known as an effective technique to reduce emitted nitrogen oxides. However, wear of piston rings and cylinder liner is sharply increased by EGR. It is widely considered that sulfur dioxide contained in exhaust gas is strongly related to wear. In order to clarify the effect of sulfur dioxide only on wear of piston rings and cylinder liner, we performed an experiment on the addition of sulfur dioxide to intake air. Furthermore, we compared the amount of wear, which was measured experimentally, with that of sulfur dioxide diffused into a lubricating oil film, which was estimated by a numerical model. Consequently, it was found that sulfur dioxide absorbed into a lubricating oil film played an important role on wear of piston rings and cylinder liner.