Abstract
The gasification of green algae Chlorella vulgaris in air was investigated using both a thermogravimetric analyzer (TGA) and a bench scale horizontal axis quartz tube reactor (HQR). The full range of solid state kinetic models produced best fits with TGA results varied for the five subzones of conversion vs temperature, with the nucleation and nuclei growth “A2” followed by “A3” or contracting volume models producing close matches for T ≤ 367 °C, a zero-order model between 358 and 468 °C, and contracting surface models for T ≥ 458 °C; each model yielding their set of apparent activation energy (E 0.04 s–1) corresponding to rate constants in the range 0.001–0.005 s–1. The HQR was used to investigate the effects of microalgal biomass loading, temperature, and equivalence ratio (ER) on CnHm/CO/H2 gas yield and composition, carbon conversion efficiency (CCE), and lower heating value (LHV) of syngas under air gasification conditions. Increasing microalgal biomass...
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