Combustion kinetics and particle fragmentation of raw and torrified pine shells and olive stones in a drop tube furnace

Particle fragmentation of raw and torrefied biomass during combustion in a drop tube furnace

“…Briefly, in the near burner region the raw biomass fuels present slightly higher temperatures than the torrefied biomass fuels because of the more intense devolatilization and combustion rates associated to the raw materials. As the axial distance from the top of the DTF increases the differences between the measured temperatures diminish [13]. Fig.…”

“…3 shows the particle burnout profiles obtained along the axis of the DTF for all biomass fuels studied. The data for pine shells and olive stones were taken from Costa et al [13]. The figure reveals that the pine shells burnout along the DTF is higher than that of the olives stones and wheat straw, while the differences between the olive stones and the wheat straw burnout values are relatively small, with the latter presenting lower values at the DTF exit.…”

“…Temperature profiles along the axis of the DFT for all biomass fuels studied were measured and reported in [13]. Briefly, in the near burner region the raw biomass fuels present slightly higher temperatures than the torrefied biomass fuels because of the more intense devolatilization and combustion rates associated to the raw materials.…”

Biofuels from oilseed fruits using different thermochemical processes: opportunities and challenges

“…Biodiesels produced from oilseed fruits Palm fruits 106,107 Olive stones 24,56 Babassu coconut 61,63 Soybeans 25,103,108 Tucumã seeds 20,109,110 Macauba palm 111,112 Ultimate analysis (%) moisture, directly affect the combustion process, altering the heat generation and heat transfer, and reaction rates. 71 However, for Zhao et al 117 and Senneca, 118 the primary air flow rate is the essential parameter in the biofuels combustion process, evaluating the oxygen concentration existing and convection heat transfer.…”

“…19 Many studies showed that biomasses from oilseed fruit and its wastes can be used for biofuel and bioenergy production by different thermochemical processes -for instance, direct combustion, pyrolysis, oxy-fuel combustion, gasification, and transesterification. 7,[19][20][21][22][23][24][25][26][27][28][29][30] These thermal conversion methods vary depending on the oilseed fruits used as feedstock for biofuel production. The characteristics of the biofuels produced also vary depending on the feedstock and method used.…”