Arbejde PhD position: Understanding Sulphuric Acid Accumulation in Lube Oil in Diesel Engines Hovedstaden Danmarks Tekniske Universitet - jobtilbud

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stillingsbetegnelse:
PhD position: Understanding Sulphuric Acid Accumulation in Lube Oil in Diesel Engines

jobbeskrivelse:
The Department of Chemical and Biochemical Engineering at the Technical University of Denmark seeks a PhD student to work on the PhD project: Understanding Sulphuric Acid Accumulation in Lube Oil in Diesel Engines. Background The majority of goods worldwide are transported by ships. In the next 5-10 years stricter regulations on the pollution from these vessels are coming into force. These include regulations for nitrogen oxides and carbon dioxide. At the same time more stringent regulations on fuel sulfur content are introduced. A consequence is that the ship engines, for a large part designed by MAN Diesel & Turbo A/S in Copenhagen, and in particular the operation of the ship engines will be changed. One of the major challenges in this context is to prevent "cold corrosion" in the engines, which has proven to be a bigger problem when “slow-steaming” (i.e. sailing at reduced speeds). "Cold corrosion" is a mixture of acid attack and mechanical wear in the engine that occurs because the sulfuric acid to a greater extent condenses on the cylinder walls in the engines at conditions of slow-steaming where the engine runs at a reduced load. Expensive lube oil with limestone is continuously added to the cylinders to neutralize the acid generated, but the efficiency of this procedure is not always optimal. Purpose of PhD project The purpose is to develop an understanding of sulphuric acid droplet formation in the lube oil at the cast iron cylinder wall as a function of fuel S, cylinder temperature and pressure, water content of combustion air, limestone and surfactant content of the lube oil, and other relevant parameters. The investigation (model) can include rate-influencing phenomena such as gas phase composition and pressure cycles (at about 2000 °C), gas phase oxidation of SO2 to SO3, condensation of water and sulphuric acid droplets on the lube oil film surface, diffusion of surfactants, transport of H+ from droplets to limestone surfaces, and transport of acidic droplets to the cast iron cylinder wall. Project contents The main core of the project is to develop an understanding of the process, as described above, using modelling, experiments, and collection of full scale data. Experimental challenges include the moving piston, which generates very short transients in both gas and oil phase, and the high pressures prevailing in the cylinder. The conditions inside the cylinder will need to be reproduced in lab- or pilot-scale experimental set ups and the different subprocesses should be studied separately where possible. Valuable information may be obtained from the lube oil output stream (e.g. residual limestone, water and metal contents). Investigations using a range of model oils with different concentrations of surface active agents and limestone may provide knowledge on the transport and reaction mechanisms in the oil. Relation to other PhD and post doc projects The PhD. project is part of a larger research project, where the combined output from the different projects should lead to new engine designs and/or new operational engine procedures, which will consume less lube oil. The model simulations of the Ph.D. project should provide estimations of the conditions (acid strength and droplet distribution) prevailing at the oil-cylinder wall interphase, where corrosion takes place. The cast iron tribo-corrosion process itself is not part of this Ph.D. project and will be handled in another Ph.D. project. Other subprojects (not part of this Ph.D. project) will provide valuable information on e.g. oil flow pattern, gas phase composition, and the actual formation and condensation of acid on an oil film under laboratory conditions (lube oil test rig). Objectives •Literature study on diesel engines and the chemistry of a selected running diesel engine •Collection and analysis of spent lube oil from selected full-scale diesel engines •Exchange and use of data from the other subprojects (in parti

Arbejdsgiver Navn: Danmarks Tekniske Universitet

Arbejdsgiver telefonnummer: 45252525

Arbejdsgiver faxnummer: 45881799

Job kort beskrivelse:
Undervisning og forskning på universiteter og højere læreranstalter

land: Danmark

region: Hovedstaden

krævede uddannelse: Ikke angivet

Kilde til jobtilbud: AMS, Offentlige arbejdsformidlinger, Danmark

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