Combustion of selected alternative liquid fuels at oxy-fuel conditions: experiments and modelling

Research output: ThesisDoctoral Thesis (compilation)

Abstract

Combustion of fuels is a major source of energy and at the same time a threat to the environment. Carbon dioxide (CO2) emissions are one of the obstacles on the route to cleaner energy. Combining Carbon Capture and Storage-technology (CCS) with use of biofuels lead to a negative net release of CO2 can be achieved. With some CCS-techniques the CO2 is repurposed in the combustion process together with O2. However, use of CO2 in the combustion process changes the prerequisites for the combustion process, and challenges our knowledge of fuel characteristics and chemistry.
The first objective of the thesis was to increase the knowledge of fuels burnt under CO2-rich conditions. An increased understanding of alcohol chemistry under such conditions is of interest for its effect on fundamental combustion properties, such as the laminar burning velocity. Measurements of the laminar burning velocity were performed using the Heat flux method for ethanol and methanol flames with O2+CO2 as the oxidizer. The experimental results were used as input to evaluate the performance of kinetic mechanisms from literature validated for combustion with air, at CO2-rich conditions and examining how the mechanisms interpret the chemistry in the examined mixtures.
A second objective of the thesis was to study the ignition and flame characteristics of fuels with fuel-bound nitrogen, using nitromethane as a model-fuel. Nitromethane+O2+N2 were examined for ignition characteristics in a shock tube, and the laminar burning velocity was examined for nitromethane burnt with air and with O2+CO2. From combining the experimental results with modeling and literature studies, the importance of knowledge of a fuel’s combustion characteristics, when interpreting experimental results was highlighted. Both objectives of the thesis, on CO2-rich combustion and fuel-nitrogen combustion, were combined when nitromethane was studied at CO2-rich condition.
Knowledge on important fundamental combustion properties under CO2-rich conditions was provided to the scientific community in the form of experimental results on laminar burning velocity and ignition characteristics. An evaluation of current knowledge of the underlying chemistry behind these fundamental combustion properties, was provided through kinetic modeling, highlighting gaps in our current understanding of combustion chemistry.

Details

Authors
  • Jenny D. Nauclér
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Physics Topics

Keywords

  • Alcohols, Nitromethane, Chemistry, Laminar burning velocity, Ignition, Combustion, Fysicumarkivet A:2016:Nauclér
Original languageEnglish
QualificationDoctor
Awarding Institution
Supervisors/Assistant supervisor
Award date2016 Oct 28
Place of PublicationLund, Sweden
Publisher
  • mediatryck, Lund University
Print ISBNs978-91-7623-948-3
Electronic ISBNs978-91-7623-949-0
Publication statusPublished - 2016 Oct 4
Publication categoryResearch

Bibliographic note

Defence details Date: 2016-10-28 Time: 09:15 Place: Lecture hall Rydbergsalen, Department of Physics, Professorsgatan 1, Lund University, Faculty of Engineering External reviewer(s) Name: Terese Løvås Title: Professor Affiliation: Norwegian University of Science and Technology, Norway ---

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