Corrosive wear in crosshead diesel engines

Helden, A. K. van; Valentijn, M.C.; Doorn, H.M.J. van

doi:10.1016/0301-679x(89)90156-4

Cited by 9 publications

(12 citation statements)

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“…In section 3, we conclude that reverse micelle adsorption onto the H 2 SO 4 droplets is most likely the limiting step in the neutralization mechanism at well-mixed conditions, in line with the literature investigations. 21 However, early modeling studies [39][40][41] indicated that the neutralization reaction may be acid diffusion-controlled. In this study, a reaction rate expression that accounts for both micelle diffusion-and adsorption-resistance will be set up for comparison and the rate-limiting step identified.…”

Section: Reaction Rate Expressionsmentioning

confidence: 99%

“…The dependence of temperature follows the viscosity temperaturedependency, which is typically a strong function of temperature. 47 The micelle-diffusion controlled reaction rate is first order with respect to each reactant (H 2 SO 4 droplet and CaCO 3 micelle, respectively), and is given by [39][40][41] :…”

Section: Diffusion-controlled Reaction Rate Expressionmentioning

confidence: 99%

“…The neutralization reaction rate increases significantly with the lube oil temperature, while the lube oil base number and the H 2 SO 4 droplet concentration have only a minor impact at a maintained Ca/S molar ratio. Modeling predictions indicate that H 2 SO 4 will be present to some degree on the cylinder liner surface independent of how well-wetted the liner is 41. …”

mentioning

confidence: 99%

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Mixed Flow Reactor Experiments and Modeling of Sulfuric Acid Neutralization in Lube Oil for Large Two-Stroke Diesel Engines

Lejre

Glarborg

Mayer³

et al. 2018

Ind. Eng. Chem. Res.

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Lubrication oil for marine diesel engines contains additives in the form of CaCO 3 -based reverse micelles, which can neutralize condensing H 2 SO 4 , and thereby limit uncontrolled corrosive wear of the piston rings and cylinder liner. In the present work, the neutralization mechanism was studied experimentally and through modeling.Using a mixed flow reactor (MFR), the rate of the acid-base reaction was measured as a function of relevant process parameters. In addition, the competition between CaCO 3 reverse micelles and NaOH droplets for a reaction with H 2 SO 4 droplets in a lube oil emulsion was explored in a batch reactor. For the residence times investigated, the results show that CaCO 3 conversion is significantly reduced when reaching a critically low Ca/S ratio. Furthermore, a mathematical model for the neutralization of H 2 SO 4 droplets by CaCO 3 reverse micelles in lube oil under well-mixed conditions was developed. Both the experimental data and simulations support previous results suggesting that the limiting step in the neutralization mechanism is adsorption of reverse micelles onto the much larger H 2 SO 4 droplets. Using the video-microscopy experiments of Fu et al.1 ), 221-225], it was possible to estimate kinetic parameters for the adsorption-controlled reaction. The model was used to predict conversion of H 2 SO 4 in a lube oil film at the cylinder liner surface for conditions relevant for a full-scale application. Calculations indicated that H 2 SO 4 may reach the liner surface regardless of how well-wetted the surface is.

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Section: Reaction Rate Expressionsmentioning

confidence: 99%

Section: Diffusion-controlled Reaction Rate Expressionmentioning

confidence: 99%

mentioning

confidence: 99%

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Mixed Flow Reactor Experiments and Modeling of Sulfuric Acid Neutralization in Lube Oil for Large Two-Stroke Diesel Engines

Lejre

Glarborg

Mayer³

et al. 2018

Ind. Eng. Chem. Res.

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“…However, the complete picture and all mechanisms of the acid corrosion of the engine cylinder are still not known. Commercial application of overbased detergents has been practiced for almost 70 years, and, in the presence of overbased detergents, cylinder liner corrosion has been attributed to un-reacted acids solubilized in lubricating films [19,23]. However, the solubilized acid reverse micelles in oil should be on the magnitude of several nanometers and have been demonstrated to be neutralized rapidly [21].…”

Section: Introductionmentioning

confidence: 99%

Ostwald ripening: a decisive cause of cylinder corrosive wear

Papadopoulos

et al. 2007

Tribol Lett

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Acids formed from fuel combustion and lubricating oil breakdown can promote corrosive engine wear. Using capillary videomicrocopy to investigate the neutralization of sulfuric acid droplets by overbased additives in lubricating oil, we have found that the Ostwald ripening of acid droplets may be a decisive factor of corrosive wear because it prolongs the lifetime of larger acid droplets. This finding provides a new understanding of how acids corrode engine parts, and in particular, why the most corrosive engine wear often occurs at piston top dead center, and may lead to new strategies for engine designs and lubricating oil additives.

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“…Due to the aforementioned reasons, sulfuric acid condensation and cold corrosion for HFO fueled marine engines is an active ongoing research field [6,7,8,9,10]. Nevertheless, there is no open literature to date for engine sulfuric acid condensation simulations using three-dimensional (3D) computational fluid dynamics (CFD) modeling.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of condensation of sulfuric acid and water in a large two-stroke marine diesel engine

Karvounis

Pang

Mayer³

et al. 2018

Applied Energy

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Corrosive wear in crosshead diesel engines

Cited by 9 publications

References 1 publication

Mixed Flow Reactor Experiments and Modeling of Sulfuric Acid Neutralization in Lube Oil for Large Two-Stroke Diesel Engines

Mixed Flow Reactor Experiments and Modeling of Sulfuric Acid Neutralization in Lube Oil for Large Two-Stroke Diesel Engines

Ostwald ripening: a decisive cause of cylinder corrosive wear

Numerical simulation of condensation of sulfuric acid and water in a large two-stroke marine diesel engine

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