Experimental Investigation of Sulfuric Acid Condensation and Corrosion Rate in Motored BUKH DV24 Diesel Engine

Abstract

The work conducted in this paper presents a novel experimental setup to study sulfuric acid cold corrosion of cylinder liners in large two-stroke marine diesel engines. The process is simulated in a motored light duty BUKH DV24 diesel engine where the charge air contain known amounts of H2SO4 and H2O vapor. Liner corrosion is measured as iron accumulation in the lube oil. Similarly sulfuric acid condensation is assessed by measuring the accumulation of sulfur in the lube oil. To clarify the corrosive effect of sulfuric acid the lube oil utilized for experiments is a sulfur free neutral oil without alkaline additives (Chevron Neutral Oil 600R). Iron and sulfur accumulation in the lube oil is analyzed with an Energy Dispersive X-Ray Fluorescence (ED-XRF) apparatus. Three test cases with different H2SO4 concentrations are run. Results reveal good agreement between sulfuric acid injection flow and the accumulation of both iron and sulfur in the oil.

An experimental investigation of the corrosive influence of SO2 relative to H2SO4 of marine engine cylinder liners

“…The continuous engine improvements in combination with the broad use of “slow steaming” has led to doubts regarding the influence of SO 2 wear relative to H 2 SO 4 . A previous experimental study conducted by the authors supports the coupling between corrosive liner wear and the presence of even small concentrations of H 2 SO 4 (parts per million [ppm] level) in the cylinder gas . The present study follows up on that work by studying the influence of SO 2 wear relative to H 2 SO 4 .…”

“…A previous experimental study conducted by the authors supports the coupling between corrosive liner wear and the presence of even small concentrations of H 2 SO 4 (parts per million [ppm] level) in the cylinder gas. 26 The present study follows up on that work by studying the influence of SO 2 wear relative to H 2 SO 4 . The same test facility that involves a modified and motored light-duty BUKH DV24 engine is used.…”

An experimental study of the effect of condensing water vapour on the cold corrosion wear of marine engine cylinder liners

“…The authors have used the motored engine in prior studies, and measured liner wear at small H 2 SO 4 concentrations (ppm level). 12,25 Like in a fired marine engine, the wear is concentrated in the top of the liner. 12 A few additional experiments have also indicated, that the presence of H 2 O vapours can have a significant impact on the liner wear if water condenses on the liner surface.…”