Modeling the condensation of sulfuric acid and water on the cylinder liner of a large two-stroke marine diesel engine

Cordtz, Rasmus Faurskov; Mayer, Stefan; Eskildsen, S.S.; Schramm, Jesper

doi:10.1007/s00773-017-0455-9

Cited by 17 publications

(30 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several charge gas compositions are introduced into the cylinders of the motored BUKH engine. Since the engine experiences no combustion and therefore produces lower peak pressures than a fired marine engine, the dosing of SO 2 , H 2 SO 4 , and H 2 O is tuned to mimic the partial pressures within the cylinder of a fired marine engine . The steady experimental operating conditions are listed in Table .…”

Section: Methodsmentioning

confidence: 99%

“…The rate of H 2 O and H 2 SO 4 condensation onto the liner surface scales with

p_{H_{2} normalO}

and

p_{H_{2} {SO}_{4}}

, respectively, which “mirror” the cylinder gas pressure. Moreover, when

T_{H_{2} normalO, dp} > T_{L}

, the rate of pure water condensation may highly exceed that of sulphuric acid since

x_{H_{2} normalO}

x_{H_{2} {SO}_{4}}

.…”

Section: Calculationsmentioning

confidence: 99%

“…Nevertheless, as the pressure falls during the expansion stroke, condensed water will begin to evaporate from the wetted liner surface when T L exceeds

T_{H_{2} normalO, dp}

after TDC. In large marine engines, H 2 O condensation is also confined to the top of the liner, and H 2 SO 4 may condense on the entire liner surface …”

Section: Calculationsmentioning

confidence: 99%

“…The conversion may, however, be more than 4% in large low‐speed marine engines partly because of much lower engine speeds. In addition, advanced computational efforts indicate that H 2 SO 4 vapours will condense on the cylinder liners …”

Section: Introductionmentioning

confidence: 99%

“…In addition, advanced computational efforts indicate that H 2 SO 4 vapours will condense on the cylinder liners. 19,20 Cylinder lubrication oils used in large two-stroke marine engines contain alkaline additives (primarily CaCO 3 ) that neutralise acids. [21][22][23][24] The content of alkaline constituents is defined by the base number (BN).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Kjemtrup

Cordtz

Jensen

et al. 2020

Lubrication Science

Self Cite

View full text Add to dashboard Cite

The present study investigates the corrosive influence of SO2 on cylinder liner wear relative to H2SO4. Several charge gases with different concentrations of SO2, H2SO4, and H2O in air are fed to a motored light duty test engine that operates at 98 revolutions per minute (rpm) in order to resemble the corrosive combustion gas and cycle speed of large low‐speed two‐stroke marine engines. When the trapped cylinder gas is compressed, the H2SO4 and H2O vapours can condense on the oil wetted liner surface, and the SO2 can be absorbed in the oil film. Hereby the liner surface may be exposed to a corrosive attack. A blend of a base oil and a commercial marine engine cylinder lubrication oil is used in the experiments. During testing, oil samples are extracted from the engine and subsequently analysed for iron and sulphur accumulation (using an energy dispersive X‐ray fluorescence spectrometer) in order to couple cylinder liner wear with the amount of SO2, H2SO4, and H2O in the charge gas. In contrast to H2SO4, the wear of SO2 is weak (if any), although the SO2 accumulates/reacts considerably in the lube oil. The highest wear rates are found at elevated H2O concentrations.

show abstract

Section: Methodsmentioning

confidence: 99%

“…The rate of H 2 O and H 2 SO 4 condensation onto the liner surface scales with

p_{H_{2} normalO}

and

p_{H_{2} {SO}_{4}}

, respectively, which “mirror” the cylinder gas pressure. Moreover, when

T_{H_{2} normalO, dp} > T_{L}

, the rate of pure water condensation may highly exceed that of sulphuric acid since

x_{H_{2} normalO}

x_{H_{2} {SO}_{4}}

.…”

Section: Calculationsmentioning

confidence: 99%

“…Nevertheless, as the pressure falls during the expansion stroke, condensed water will begin to evaporate from the wetted liner surface when T L exceeds

T_{H_{2} normalO, dp}

after TDC. In large marine engines, H 2 O condensation is also confined to the top of the liner, and H 2 SO 4 may condense on the entire liner surface …”

Section: Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Kjemtrup

Cordtz

Jensen

et al. 2020

Lubrication Science

Self Cite

View full text Add to dashboard Cite

show abstract

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

Cordtz

Kjemtrup

Jensen

et al. 2022

Lubrication Science

Self Cite

View full text Add to dashboard Cite

This work presents an experimental study of the cold corrosion wear phenomenon that is experienced on the cylinder liners in large two-stroke marine diesel engines that burn heavy fuel oil containing sulfur. The wear is caused by condensing sulfuric acid-and water vapours (H 2 SO 4 and H 2 O, respectively) that are formed during combustion. In this work, cold corrosion is studied experimentally with a modified and motored light duty engine that operates at 98 revolutions per minute, in order to match the rotational speed of a large marine engine. The engine works as a tribotester where multiple charge gas compositions with up to 10% H 2 O and 80 ppm H 2 SO 4 (mole/mole) in dry air are fed to its cylinders to produce realistic marine engine H 2 O and H 2 SO 4 partial pressures. A lube oil blend that is composed by a conventional two-stroke marine engine cylinder lube oil and a base oil is used in the experiments. By extracting oil samples from the engine oil swamp during an experiment (that are analysed for iron and sulfur content using an energy dispersive X-ray fluorescence spectrometer) the cylinder liner wear rate and sulfuric acid condensation rate are determined for the applied charge gas composition and liner surface temperature (primarily 80 C). The method shows that the different charge gas compositions yield distinct liner wear rates and the highest wear rates are experienced at elevated H 2 O concentrations where the influence of H 2 SO 4 is comparably low.

show abstract

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

Self Cite

View full text Add to dashboard Cite

 Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

show abstract

Modeling the condensation of sulfuric acid and water on the cylinder liner of a large two-stroke marine diesel engine

Cited by 17 publications

References 25 publications

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

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

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

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

Contact Info

Product

Resources

About

Modeling the condensation of sulfuric acid and water on the cylinder liner of a large two-stroke marine diesel engine

Cited by 17 publications

References 25 publications

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

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

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

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

Contact Info

Product

Resources

About

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

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