Investigation of alternative biomass fuels and Turkish lignites at high heating rate pyrolysis and combustion conditions

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2021-2-12

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Magalhaes, Duarte

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The objective of this work was to investigate alternative Turkish fuels fortheir ignition, combustion, pyrolysis, and gasification behavior and to select alternative fuels for co-firing, co-pyrolysis, and co-gasification applications based on low and high heating rate experimental results. Agricultural biomass (olive residue, almond shell, and hazelnut shell)and Turkish lignites (Tunçbilek, and Soma) were chosen as the feedstocks. Severalexperimental rigs used such as thermogravimetric analyser; wire mesh reactor; drop tube furnace; and entrained flow reactor were used to fully characterise the fuels at different heating rates. The results showed that the ignitiondelay time of different feedstocks converged with increase in temperature and thus based on the ignition delay time biomass and lignites can be co-fired provided that in a similar particle size. Single particle observation during high heating rate combustion showed that torrefied biomass and Tunçbilek lignite had comparable burnout times, whereas extensive fragmentation of Soma lignite resulted in short burnout times. High heating rate combustion observations were found useful as coal classification tool. The pretreatment of biomass and co-firing allowed significant reduction of PM2.5. Results from fast pyrolysis of lignocellulosic biomass showed that laboratoryfractionated biomass provided high purity components and better predictions of the char yields as compared to commercial samples. The fast pyrolysis stage did not have a significant effect on the char co-gasification kinetics.

Subject Keywords

Alternative biomass, Turkish lignite, Combustion, Pyrolysis, High heating rate

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https://hdl.handle.net/11511/89902

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

D. Magalhaes, “Investigation of alternative biomass fuels and Turkish lignites at high heating rate pyrolysis and combustion conditions,” Ph.D. - Doctoral Program, Middle East Technical University, 2021.