Pyrolysis of biomass in a batch fluidized bed reactor: Effect of the pyrolysis conditions and the nature of the biomass on the physicochemical properties and the reactivity of char

Abstract

OATAO is an open access repository that collects the work of some Toulouse researchers and makes it freely available over the web where possible.

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO2

“…Besides, the intensity of band at 873 cm −1 for PS char‐973 is weaker than that of PS char‐873; the band of PS char‐1073 fully disappeared, which indicates that the part of aromatic CH out‐of‐plane have been decomposed because of high temperature. The same experiment results were presented by Morin et al and Sharma et al From the above analysis, when the pyrolysis temperature increases, the surface functional groups of biomass chars are gradually destroyed, which means that the char‐CO 2 binding capacity is declined and the gasification reactivity is lower.…”

Biomass Chars: The Effects of Pyrolysis Conditions on Their Morphology, Structure, Chemical Properties and Reactivity

“…The reactivity of fast pyrolysis beech bark and beech stick chars obtained between 450 °C and 850 °C were shown to be highly dependent on the pyrolysis temperature [20]. The authors think that at low pyrolysis temperatures, the high H and O contents of the char are associated with the presence of amorphous carbon structures and active sites that increase the char reactivity; whereas, when As shown in Figure 10, although the evolution of T (50%) is somewhat chaotic between 500 • C and 1000 • C, it increases following a perfect linear relation (R 2 = 0.9999) with the char yield for the chars obtained between 1000 • C and 1400 • C. This could be linked to structural ordering and graphitization above 1000 • C. As shown in Figure 10, although the evolution of ( %) is somewhat chaotic between 500 °C and 1000 °C, it increases following a perfect linear relation (R 2 = 0.9999) with the char yield for the chars obtained between 1000 °C and 1400 °C.…”

“…The reactivity of fast pyrolysis beech bark and beech stick chars obtained between 450 °C and 850 °C were shown to be highly dependent on the pyrolysis temperature [20]. The authors think that at low pyrolysis temperatures, the high H and O contents of the char are associated with the presence of amorphous carbon structures and active sites that increase the char reactivity; whereas, when Moreover, the char mean reactivity significantly decreases as pyrolysis temperature increases, going from 0.198 min −1 for the char-500 to 0.067 min −1 for the char-1400, which represents nearly a threefold decrease.…”

“…The authors think that at low pyrolysis temperatures, the high H and O contents of the char are associated with the presence of amorphous carbon structures and active sites that increase the char reactivity; whereas, when Moreover, the char mean reactivity significantly decreases as pyrolysis temperature increases, going from 0.198 min −1 for the char-500 to 0.067 min −1 for the char-1400, which represents nearly a threefold decrease. The reactivity of fast pyrolysis beech bark and beech stick chars obtained between 450 • C and 850 • C were shown to be highly dependent on the pyrolysis temperature [20]. The authors think that at low pyrolysis temperatures, the high H and O contents of the char are associated with the presence of amorphous carbon structures and active sites that increase the char reactivity; whereas, when raising the pyrolysis temperature, the char reactivity decreases due the formation of more aromatic, less functionalized and less reactive structures.…”

Predicting the biomass conversion performance in a fluidized bed reactor using isoconversional model‐free method

“…To produce biofuels equivalent to fossil fuel, fast pyrolysis is widely used as it enhances the liquid yield with moderate temperature and pressure condition at low residence times in a fixed bed or fluidized bed reactor . The fluidized bed reactor is widely used for fast pyrolysis technology to produce liquid fuel . The advantages of this type of reactor are uniform temperature, low investment, good gas solid contact, ability to handle varieties of feedstock with wide particle size distribution, low maintenance, high heating rate etc …”