RT Journal Article
T1 Microalgae pyrolysis under isothermal and non-isothermal conditions
A1 Cano Pleite, Eduardo
A1 Rubio Rubio, Mariano
A1 García Hernando, Néstor
A1 Soria Verdugo, Antonio
AB The present work analyzes and compares the non-isothermal and isothermal pyrolysis processes of two different kinds of microalgae: Spirulina platensis and Chlorella pyrenoidosa. The non-isothermal pyrolysis process is carried out in a Thermogravimetric Analyzer (TGA), whereas a macro-TGA bubbling fluidized bed reactor is used for the isothermal pyrolysis reaction. The simplified Distributed Activation Energy Model (DAEM) is employed to derive the kinetic parameters of the reaction in the TGA, i.e., the pre-exponential factor and the activation energy. A consecutive reaction, first-order pyrolysis model with three competitive pseudo-components for the released pyrolysis vapors is proposed to evaluate the isothermal pyrolysis experiments conducted in a macro-TGA bubbling fluidized bed. The fluidized bed experimental setup allows measuring the real-time mass evolution during the microalgae pyrolysis process, which could be used to obtain the kinetic parameters of the different reactions of which the consecutive reaction model is comprised. The activation energies of the reactions using this isothermal pyrolysis model are in good agreement, both qualitatively and quantitatively, with those obtained from the non-isothermal pyrolysis measurements run in the TGA. A quantitative comparison reveals that the TGA measurements could be employed to provide a useful first estimation of the activation energy of the isothermal pyrolysis process in the bubbling fluidized bed. Qualitatively, the Differential Thermogravimetric (DTG) curves obtained from the thermogravimetric analysis revealed the presence of three peaks in the Chlorella pyrenoidosa DTG curve and two peaks in the Spirulina platensis DTG curve, which is in agreement with the number of pseudo-component reactions in the isothermal pyrolysis model. This indicates the capability of the non-isothermal pyrolysis tests in a TGA to predict the number of reactions required to characterize the isothermal pyrolysis process.
PB Elsevier
SN 2211-9264
YR 2020
FD 2020-10
LK https://hdl.handle.net/10016/32482
UL https://hdl.handle.net/10016/32482
LA eng
DS e-Archivo
RD 30 jun. 2024