Reaction of Sulfuric Acid in Lube Oil: Implications for Large Two-Stroke Diesel Engines

Kasper Hartvig Lejre; Søren Kiil; Peter Glarborg; Henrik Christensen; Stefan Mayer

doi:10.1115/ICEF2017-3580

Reaction of Sulfuric Acid in Lube Oil: Implications for Large Two-Stroke Diesel Engines

Kasper Hartvig Lejre, Søren Kiil, Peter Glarborg, Henrik Christensen, Stefan Mayer

MAN Diesel and Turbo

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Abstract

Slow-steaming operation and an increased pressure in the combustion chamber have contributed to increased sulfuric acid (H₂SO₄) condensation on the cylinder liners in large two-stroke marine diesel engines, thus causing increased corrosion wear. To cope with this, lube oils are formulated with overbased detergent additives present as CaCO₃reverse micelles to neutralize the condensing H₂SO₄. In this present work, a mixed flow reactor (MFR) setup aims to investigate the neutralization reaction by varying Ca/S molar ratio, stirrer speed, H₂SO₄ inlet concentration, and residence time. Lube oil samples from the outlet of the MFR were analysed by use of Fourier Transform Infrared Spectroscopy (FTIR) and a titration method. The MFR results indicate that the CaCO₃-H₂SO₄ reaction is very fast in a real engine, if the cylinder liner is well-wetted, the oil-film is well-mixed, and contains excess of CaCO₃ compared to the condensed H₂SO₄. The observed corrosion wear in large two-stroke marine diesel engines could consequently be attributed to local molar excess of H₂SO₄ compared to CaCO₃ reverse micelles on the cylinder liners.

Original language	English
Title of host publication	Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference
Number of pages	10
Volume	Volume 1: Large Bore Engines; Fuels; Advanced Combustion
Publisher	The American Society of Mechanical Engineers (ASME)
Publication date	2017
Article number	ICEF2017-3580
ISBN (Electronic)	978-0-7918-5831-8
DOIs	https://doi.org/10.1115/ICEF2017-3580
Publication status	Published - 2017
Event	Internal Combustion Engine Fall Technical Conference (ICEF 2017) - Seattle, United States Duration: 15 Oct 2017 → 18 Oct 2017

Conference

Conference	Internal Combustion Engine Fall Technical Conference (ICEF 2017)
Country/Territory	United States
City	Seattle
Period	15/10/2017 → 18/10/2017

Keywords

Corrosion
Lubrication
Neutralization
Mechanism

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1115/ICEF2017-3580

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Lejre, K. H., Kiil, S., Glarborg, P., Christensen, H., & Mayer, S. (2017). Reaction of Sulfuric Acid in Lube Oil: Implications for Large Two-Stroke Diesel Engines. In Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference (Vol. Volume 1: Large Bore Engines; Fuels; Advanced Combustion). Article ICEF2017-3580 The American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/ICEF2017-3580

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title = "Reaction of Sulfuric Acid in Lube Oil: Implications for Large Two-Stroke Diesel Engines",

abstract = "Slow-steaming operation and an increased pressure in the combustion chamber have contributed to increased sulfuric acid (H2SO4) condensation on the cylinder liners in large two-stroke marine diesel engines, thus causing increased corrosion wear. To cope with this, lube oils are formulated with overbased detergent additives present as CaCO3 reverse micelles to neutralize the condensing H2SO4. In this present work, a mixed flow reactor (MFR) setup aims to investigate the neutralization reaction by varying Ca/S molar ratio, stirrer speed, H2SO4 inlet concentration, and residence time. Lube oil samples from the outlet of the MFR were analysed by use of Fourier Transform Infrared Spectroscopy (FTIR) and a titration method. The MFR results indicate that the CaCO3-H2SO4 reaction is very fast in a real engine, if the cylinder liner is well-wetted, the oil-film is well-mixed, and contains excess of CaCO3 compared to the condensed H2SO4. The observed corrosion wear in large two-stroke marine diesel engines could consequently be attributed to local molar excess of H2SO4 compared to CaCO3 reverse micelles on the cylinder liners.",

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booktitle = "Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference",

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note = "Internal Combustion Engine Fall Technical Conference (ICEF 2017) ; Conference date: 15-10-2017 Through 18-10-2017",

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Lejre, KH, Kiil, S , Glarborg, P, Christensen, H & Mayer, S 2017, Reaction of Sulfuric Acid in Lube Oil: Implications for Large Two-Stroke Diesel Engines. in Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference. vol. Volume 1: Large Bore Engines; Fuels; Advanced Combustion, ICEF2017-3580, The American Society of Mechanical Engineers (ASME), Internal Combustion Engine Fall Technical Conference (ICEF 2017), Seattle, Washington, United States, 15/10/2017. https://doi.org/10.1115/ICEF2017-3580

Reaction of Sulfuric Acid in Lube Oil: Implications for Large Two-Stroke Diesel Engines. / Lejre, Kasper Hartvig; Kiil, Søren ; Glarborg, Peter et al.
Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference. Vol. Volume 1: Large Bore Engines; Fuels; Advanced Combustion The American Society of Mechanical Engineers (ASME), 2017. ICEF2017-3580.

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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T1 - Reaction of Sulfuric Acid in Lube Oil: Implications for Large Two-Stroke Diesel Engines

AU - Lejre, Kasper Hartvig

AU - Kiil, Søren

AU - Glarborg, Peter

AU - Christensen, Henrik

AU - Mayer, Stefan

PY - 2017

Y1 - 2017

N2 - Slow-steaming operation and an increased pressure in the combustion chamber have contributed to increased sulfuric acid (H2SO4) condensation on the cylinder liners in large two-stroke marine diesel engines, thus causing increased corrosion wear. To cope with this, lube oils are formulated with overbased detergent additives present as CaCO3 reverse micelles to neutralize the condensing H2SO4. In this present work, a mixed flow reactor (MFR) setup aims to investigate the neutralization reaction by varying Ca/S molar ratio, stirrer speed, H2SO4 inlet concentration, and residence time. Lube oil samples from the outlet of the MFR were analysed by use of Fourier Transform Infrared Spectroscopy (FTIR) and a titration method. The MFR results indicate that the CaCO3-H2SO4 reaction is very fast in a real engine, if the cylinder liner is well-wetted, the oil-film is well-mixed, and contains excess of CaCO3 compared to the condensed H2SO4. The observed corrosion wear in large two-stroke marine diesel engines could consequently be attributed to local molar excess of H2SO4 compared to CaCO3 reverse micelles on the cylinder liners.

AB - Slow-steaming operation and an increased pressure in the combustion chamber have contributed to increased sulfuric acid (H2SO4) condensation on the cylinder liners in large two-stroke marine diesel engines, thus causing increased corrosion wear. To cope with this, lube oils are formulated with overbased detergent additives present as CaCO3 reverse micelles to neutralize the condensing H2SO4. In this present work, a mixed flow reactor (MFR) setup aims to investigate the neutralization reaction by varying Ca/S molar ratio, stirrer speed, H2SO4 inlet concentration, and residence time. Lube oil samples from the outlet of the MFR were analysed by use of Fourier Transform Infrared Spectroscopy (FTIR) and a titration method. The MFR results indicate that the CaCO3-H2SO4 reaction is very fast in a real engine, if the cylinder liner is well-wetted, the oil-film is well-mixed, and contains excess of CaCO3 compared to the condensed H2SO4. The observed corrosion wear in large two-stroke marine diesel engines could consequently be attributed to local molar excess of H2SO4 compared to CaCO3 reverse micelles on the cylinder liners.

KW - Corrosion

KW - Lubrication

KW - Neutralization

KW - Mechanism

U2 - 10.1115/ICEF2017-3580

DO - 10.1115/ICEF2017-3580

M3 - Article in proceedings

VL - Volume 1: Large Bore Engines; Fuels; Advanced Combustion

BT - Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference

PB - The American Society of Mechanical Engineers (ASME)

T2 - Internal Combustion Engine Fall Technical Conference (ICEF 2017)

Y2 - 15 October 2017 through 18 October 2017

ER -

Lejre KH, Kiil S , Glarborg P, Christensen H, Mayer S. Reaction of Sulfuric Acid in Lube Oil: Implications for Large Two-Stroke Diesel Engines. In Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference. Vol. Volume 1: Large Bore Engines; Fuels; Advanced Combustion. The American Society of Mechanical Engineers (ASME). 2017. ICEF2017-3580 doi: 10.1115/ICEF2017-3580

Reaction of Sulfuric Acid in Lube Oil: Implications for Large Two-Stroke Diesel Engines

Abstract

Conference

Keywords

UN SDGs

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