title: Oxy-fuel combustion characteristics and kinetics of microalgae Chlorella vulgaris by thermogravimetric analysis.
abstract: Oxy-fuel or O2/CO2 combustion technology was used to investigate the combustion of Chlorella vulgaris by thermogravimetric analysis (TGA). Oxy-fuel combustion occurs in an O2/CO2 atmosphere instead of an O2/N2 atmosphere and offers an alternative method of C. vulgaris preparation for biofuels processing. Our results show that three stages were observed during C. vulgaris combustion and the main combustion process occurred at the second stage. Compared with a 20%O2/80%N2 atmosphere, the mass loss rate at the DTG peaks (Rp) and the average reaction rate (Rv) in a 20%O2/80%CO2 atmosphere was lower, while the ignition temperature (TI) was higher. As oxygen concentration increases in an O2/CO2 atmosphere, Rp, Rv and the apparent activation energy (E) increases, while TI, the final temperature detected as mass stabilization (Tf) and the residue mass (Mr) decreases; As the heating rate (β) increases, TI, Tf and Rp increase, while Mr decreases.
authors.affiliation: College of Electrical Engineering, Guangxi University, Xixiangtang District, Nanning City, PR China. xiangxiang570@163.com
authors.forename: Chunxiang
authors.initials: C
authors.lastname: Chen
authors.forename: Ziguang
authors.initials: Z
authors.lastname: Lu
authors.forename: Xiaoqian
authors.initials: X
authors.lastname: Ma
authors.forename: Jun
authors.initials: J
authors.lastname: Long
authors.forename: Yuning
authors.initials: Y
authors.lastname: Peng
authors.forename: Likun
authors.initials: L
authors.lastname: Hu
authors.forename: Quan
authors.initials: Q
authors.lastname: Lu
mesh_terms: D001272:Atmosphere; D056804:Biofuels / Q000382:microbiology; D002245:Carbon Dioxide / Q000494:pharmacology; D048408:Chlorella vulgaris / Q000187:drug effects / Q000378:metabolism*; D007700:Kinetics; D058086:Microalgae / Q000187:drug effects / Q000378:metabolism*; D008962:Models, Theoretical; D009584:Nitrogen / Q000494:pharmacology; D010100:Oxygen / Q000494:pharmacology*; D013818:Thermogravimetry / Q000379:methods*
chemical_list: D056804:Biofuels; D002245:Carbon Dioxide; D009584:Nitrogen; D010100:Oxygen
keywords: Combustion; Microalgae; O(2)/CO(2) atmosphere; O(2)/N(2) atmosphere; Thermogravimetric analysis