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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lyng Lejre, Kasper Hartvig
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2020Experimental Investigation and Mathematical Modeling of the Reaction between SO2(g) and CaCO3(s)-containing Micelles in Lube Oil for Large Two-Stroke Marine Diesel Enginescitations
- 2019Mixed Flow Reactor Experiments and Modeling of Sulfuric Acid Neutralization in Lube Oil for Large Two-Stroke Diesel Enginescitations
- 2019Mechanisms of sulfur dioxide and sulfuric acid neutralization in lube oil for marine diesel engines
- 2017Reaction of Sulfuric Acid in Lube Oil: Implications for Large Two-Stroke Diesel Enginescitations
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article
Mixed Flow Reactor Experiments and Modeling of Sulfuric Acid Neutralization in Lube Oil for Large Two-Stroke Diesel Engines
Abstract
Lubrication oil for marine diesel engines contains additives in the form of CaCO<sub>3</sub>-based reverse micelles, which can neutralize condensing H<sub>2</sub>SO<sub>4</sub>, 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<sub>3</sub> reverse micelles and NaOH droplets for a reaction with H<sub>2</sub>SO<sub>4</sub> droplets in a lube oil emulsion was explored in a batch reactor. For the residence times investigated, the results show that CaCO<sub>3</sub> conversion is significantly reduced when reaching a critically low Ca/S ratio. Furthermore, a mathematical model for the neutralization of H<sub>2</sub>SO<sub>4</sub> droplets by CaCO<sub>3</sub> 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<sub>2</sub>SO<sub>4 </sub>droplets. Using the video-microscopy experiments of Fu et al. [ Tribol. Lett. 2006, 22 (3), 221], it was possible to estimate kinetic parameters for the adsorption-controlled reaction. The model was used to predict conversion of H<sub>2</sub>SO<sub>4</sub> in a lube oil film at the cylinder liner surface for conditions relevant for a full-scale application. Calculations indicated that H<sub>2</sub>SO<sub>4</sub> may reach the liner surface regardless of how well-wetted the surface is.