Methane slip prevention in the combustion chamber - Finding the biggest methane slip problems for 4-stroke dual fuel marine engines

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dc.contributor.authorLindblom, Julius
dc.contributor.authorSu, Weidong
dc.contributor.departmentChalmers tekniska högskola / Institutionen för mekanik och maritima vetenskapersv
dc.contributor.examinerEliasson Ljungklint, Johan
dc.contributor.supervisorKoopmans, Lucien
dc.date.accessioned2021-11-10T08:07:29Z
dc.date.available2021-11-10T08:07:29Z
dc.date.issued2021sv
dc.date.submitted2020
dc.description.abstractLNG is an alternative to conventional marine engine fuels. It consists mainly of methane which has a significantly higher global warming potential (GWP) equivalent than carbon dioxide. GWP20 is 86 according to (IMO, 2020). Due to the lower carbon dioxide, NOx, sulphur, and particulate matter (PM) emissions, it is seen as a cleaner fuel. But if methane emissions occur the global warming impact will rise. Methane emissions do occur and are unregulated. But work is done to decrease it. This thesis is regarding what can be done regarding internal combustion engines releasing methane due to incomplete combustion, also known as methane slip. In the results it is shown what is causing the methane slip from the most common engine concept 4-stroke low pressure dual fuel engines. The major challenge in reducing methane slip is during low engine load and the major contributor during low load is by far quenching in the combustion. By reviewing literature, it has been shown that there are still possibilities for improvement in the combustion chamber, by reducing crevices, optimizing the piston geometry, timing the valve operation and by finding solutions to reduce the air fuel ratio during low load.sv
dc.identifier.coursecodeMMSX05sv
dc.identifier.urihttps://hdl.handle.net/20.500.12380/304326
dc.language.isoengsv
dc.setspec.uppsokTechnology
dc.subjectMethane-slipsv
dc.subjectMarine enginessv
dc.subjectLPDFsv
dc.subjectcrevicessv
dc.subjectcombustion chambersv
dc.subjectquenchingsv
dc.subjectMethane emissionsv
dc.subjectGas enginesv
dc.titleMethane slip prevention in the combustion chamber - Finding the biggest methane slip problems for 4-stroke dual fuel marine enginessv
dc.type.degreeExamensarbete på grundnivåsv
dc.type.uppsokM
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