Where does the Oxygen go? – Pathways and Partitioning in Autothermal Pyrolysis

Mazur, Ross David

doi:10.31274/etd-180810-4994

Cited by 1 publication

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References 266 publications

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“…However, there were differences between temperatures of biomass spheres and those of pyrolysis fluid for co-pyrolysis (see Figure 4). With small proportion of PP in the feed in regime 1, the melting PP coated partly the biomass particle surface with thin melting PP film to form fragments and the rest formed flocks with thick melting PP Negative synergy at co-pyrolysis involving 12.5% PP may have occurred due to the presence of high amounts of hydroxyl radicals as a result of cellulose pyrolysis in which the radicals behaved as strong oxidizers [34]. In the oxidative environment in regime 1, the activation energy of PP pyrolysis is significantly reduced [35] and its pyrolysis produces more non-condensable gas yield [36] and consequently less yield of non-polar phase as indicated in Figure 2a,b.…”

Section: Co-pyrolysis Using Feeds Containing 0 and 25% Weight Of Ppmentioning

confidence: 99%

Synergistic Effect on the Non-Oxygenated Fraction of Bio-Oil in Thermal Co-Pyrolysis of Biomass and Polypropylene at Low Heating Rate

2020

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Biomass pyrolysis and polypropylene (PP) pyrolysis in a stirred tank reactor exhibited different heat transfer phenomena whereby heat transfer in biomass pyrolysis was driven predominantly by heat radiation and PP pyrolysis by heat convection. Therefore, co-pyrolysis could exhibit be expected to display various heat transfer phenomena depending on the feed composition. The objective of the present work was to determine how heat transfer, which was affected by feed composition, affected the yield and composition of the non-polar fraction. Analysis of heat transfer phenomena was based on the existence of two regimes in the previous research in which in regime 1 (the range of PP composition in the feeds is 0–40%), mass ejection from biomass particles occurred without biomass particle swelling, while in regime 2 (the range of PP composition in the feeds is 40–100%), mass ejection was preceded by biomass particle swelling. The co-pyrolysis was carried out in a stirred tank reactor with heating rate of 5 °C/min until 500 °C and using N2 gas as carrier gas. Temperature measurement was applied to pyrolysis fluid at the lower part of the reactor and small biomass spheres of 6 mm diameter to simulate heat transfer to biomass particles. The results indicate that in regime 1 convective and radiative heat transfers sparingly occurred and synergistic effect on the yield of non-oxygenated phase increased with increasing convective heat transfer at increasing %PP in feed. On the other hand, in regime 2, convective heat transfer was predominant with decreasing synergistic effect at increasing %PP in feed. The optimum PP composition in feed to reach maximum synergistic effect was 50%. Non-oxygenated phase portion in the reactor leading to the wax formation acted as donor of methyl and hydrogen radicals in the removal of oxygen to improve synergistic effect. Non-oxygenated fraction of bio-oil contained mostly methyl comprising about 53% by mole fraction, while commercial diesel contained mostly methylene comprising about 59% by mole fraction

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Section: Co-pyrolysis Using Feeds Containing 0 and 25% Weight Of Ppmentioning

confidence: 99%