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Study of the formation of pollutants, in particular NOx, during the combustion of biogas and bio-oils

Abstract : Due to the depletion of fossil fuels and climate warnings, CO2 neutral technologies must be based primarily on renewable energy sources and must increasingly replace fossil fuels. Biogas and bio-oils are one of the renewable energy sources that are gaining attention globally due to their direct applicability without any modification, since their properties are similar to those of natural gas and petroleum. In order to use the most promising technology options, increased efforts in basic and applied research are needed. This thesis aims at obtaining a better understanding of the formation of pollutants, in particular NOx during biogas and biofuel combustion by means of both an experimental study and numerical simulations. The combustion chemistry of biogas and bio-oils in the gas phase is still relatively unknown. The establishment of an experimental database including the identification of the products and intermediates formed will allow a better understanding of the chemical reactions involved. The objective will then be to develop and validate detailed kinetic models able of reproducing the combustion of biogas and bio-oil surrogates. The study of fuel oxidation and pyrolysis was carried out using both a jet-stirred reactor and flow tube reactors over a wide range of temperature conditions (up to 2073 K). Different methods were implemented during this thesis in order to analyze the large number of intermediates. The analysis methods used for this thesis are Gas Chromatography (GC), Online-Mass Spectrometry (MS), NOx analyzer by chemiluminescence, and Fourier-Transform Infrared Spectroscopy (FTIR). The thesis allowed the study the oxidation and pyrolysis of different fuels, from biogas surrogates (NH3, NH3/CH4, NH3/H2, H2S, H2S/CH4) to bio-oil surrogates (pyrrole, ethylene glycol, propylene glycol). The study of the formation of NOx during the oxidation of CH4 and ethylene in the presence of air was also investigated during my PhD. For most of these reactants, the experimental results were used to develop and validate a kinetic model, especially with Politecnico di Milano for nitrogen and sulfur containing fuels. These models were then used to study the decomposition pathways of the species studied.
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Submitted on : Friday, May 13, 2022 - 5:38:58 PM
Last modification on : Saturday, May 14, 2022 - 3:36:41 AM

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Suphaporn Arunthanayothin. Study of the formation of pollutants, in particular NOx, during the combustion of biogas and bio-oils. Engineering Sciences [physics]. Université de Lorraine, 2021. English. ⟨NNT : 2021LORR0246⟩. ⟨tel-03667927⟩



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