title: Gasification kinetics of raw and wet-torrefied microalgae Chlorella vulgaris ESP-31 in carbon dioxide.
abstract: This study aims at investigating the gasification behavior and kinetics of microalga Chlorella vulgaris ESP-31 before and after wet torrefaction. The raw and wet-torrefied microalgae were first gasified in a thermogravimetric analyzer under a continuous CO2flow. Thereafter, the obtained thermogravimetric data were modeled for kinetic study, employing a seven-parallel-reaction mechanism. The decomposition of the microalgae in CO2shows two reactive stages: devolatilization with two peaks and gasification with a peak accompanied by a shoulder, and the thermal decomposition of components in the samples can be clearly identified. Increasing wet torrefaction temperature lowers the height of the major devolatilization peak but enhances the height of the minor one. Moreover, the kinetic evaluation reveals that wet torrefaction affects most of the kinetic parameters of the microalgal components. Furthermore, wet torrefaction temperature influences the kinetic parameters of carbohydrate and lipid, but not on those of protein, "others", and chars.
authors.affiliation: Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
authors.forename: Quang-Vu
authors.initials: QV
authors.lastname: Bach
authors.affiliation: Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan. Electronic address: weihsinchen@gmail.com.
authors.forename: Wei-Hsin
authors.initials: WH
authors.lastname: Chen
authors.affiliation: Sugar Business Division, Taiwan Sugar Corporation, Tainan 701, Taiwan.
authors.forename: Herng-Kuang
authors.initials: HK
authors.lastname: Sheen
authors.affiliation: Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan.
authors.forename: Jo-Shu
authors.initials: JS
authors.lastname: Chang
mesh_terms: D018533:Biomass; D002245:Carbon Dioxide; D048408:Chlorella vulgaris; D007700:Kinetics; D058086:Microalgae; D013818:Thermogravimetry
chemical_list: D002245:Carbon Dioxide
keywords: Gasification; Kinetic modeling; Microalgal biomass; Thermogravimetric analysis; Wet torrefaction