Investigating the effect of in-cylinder gas compositions on sulfuric acid formation and condensation using CFD modeling under large two-stroke marine engine-like conditions
Abstract
A computational fluid dynamic simulation is utilized to model the formation and condensation of sulfuric acid (H2SO4) under large two-stroke marine diesel engine like conditions. A skeletal chemical mechanism coupled with a sulfur subset is used to simulate the combustion process and the formation of sulfur oxides (SOx) and H2SO4. A fluid film model coupled with the Eulerian in-cylinder gas phase describes the condensation of H2SO4. Exhaust gas recirculation (EGR) is a well-known method to decrease the nitrogen oxides (NOx) emission. However, one of the sideeffects of EGR may be an increase in sulfuric acid condensation which leads to cold corrosion of liner. In this study the initial in-cylinder gas compositions are varied to imitate different EGR compositions (wet and dry) and the associated effects on the formation and condensation of H2SO4 are investigated. It is found that the amount of SOx formation is similar for these two kinds of EGR which is lower than base case (without EGR). The interesting finding is that the H2SO4 vapor formation for wet and dry EGR is higher and lower than the base case, respectively. The current CFD results show that applying EGR does not increase the H2SO4 condensation.
Info
Conference Abstract, 2020
UN SDG Classification
DK Main Research Area
Science/Technology
