Effect of Sulfur Dioxide in Recirculated Exhaust Gas on Wear within Diesel Engines. Relationship between Wear and Amount of SO2 Absorbed by Lubricating Oil Film.

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

“…9,10 Adding SO 2 into the charge air of a fired diesel engine has the same effect as increasing the fuel sulphur content-more SO 3 /H 2 SO 4 will form. From the authors point of view, the distinct SO 2 wear is therefore not examined when SO 2 is added into the charge air of a fired engine, as attempted by Nagaki and Korematsu 15,16 as well as Naegeli and Marbach. 3 In the present experiments, the cylinder gas temperature peaks below 800 C. At this temperature, the SO 2 to SO 3 conversion is basically frozen, and the distinct SO 2 wear can therefore be examined.…”

“…Nevertheless, SO 2 can dissolve (absorb) in formulated motor oils, and the influence of SO 2 wear in combustion engines has been studied in the past. Nagaki and Korematsu added SO 2 to the charge air of a light‐duty single‐cylinder diesel engine and found that piston ring wear increases with SO 2 addition. They reasoned that SO 2 absorbs in the cylinder liner oil film where it forms sulphuric acid and other sulphates that cause abrasive and corrosive wear.…”

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

“…It has been reported that SO 2 can promote liner corrosion by forming sulfuric-and sulfurous acids within the oil film on the cylinder liner. 2,10,11 In a recent study, the authors concluded, however, that the effect of SO 2 is insignificant in large marine engines. 12 On the other hand, the gaseous SO 3 can react with available H 2 O vapour in the cylinder gas and form H 2 SO 4 vapour.…”

Experimental investigation and mathematical modeling of the reaction between SO2(g) and CaCO3(s)-containing micelles in lube oil for large two-stroke marine diesel engines

“…Research on sulfur neutralization has mainly focused on H2SO4, which is thought to be the main cause for the observed corrosive wear, and CaCO3 consumption [4,37]. However, some studies indicate that also SO2 can contribute to corrosive wear and CaCO3 consumption [45][46][47][48][49]. Determination of the reaction kinetics of the CaCO3-SO2 reaction and assessment of its relative importance compared to the CaCO3-H2SO4 reaction in terms of CaCO3 reverse micelles consumption would be desirable.…”

“…Determination of the reaction kinetics of the CaCO3-SO2 reaction and assessment of its relative importance compared to the CaCO3-H2SO4 reaction in terms of CaCO3 reverse micelles consumption would be desirable. Nagaki and Korematsu [47,48] advocate that SO2 absorbs into the lube oil film in an engine and forms H2SO4, which subsequently reacts with the cylinder liner and/or CaCO3. Naegeli and Marbach [49] likewise found an increased wear rate for increasing SO2 addition to the intake air through the formation of sulfurous acid (H2SO3).…”