title: Kinetics characteristics of straw semi-char gasification with carbon dioxide.
abstract: The gasification process has promising potential as a solution for the current global energy problem. Kinetics characteristics of straw semi-char gasification were investigated. The main influence factors of gasification, which include bio-char particle size, pyrolysis temperature and pyrolysis atmosphere, were studied. The smaller the particle size is, the higher is the conversion rate. The gasification reactivity of semi-chars increases with pyrolysis temperature and reaches its maximum at approximately 400°C. The straw semi-char obtained in an H2 pyrolysis atmosphere has the best gasification reactivity, while the semi-char obtained in a CO2 atmosphere has the worst reactivity. In addition, characteristics of semi-char were systematically tested. A random pore model, unreacted core shrinking model and integrated model were employed to describe the reactive behavior of semi-chars. Gasification kinetics parameters were calculated. The random pore model fitting result is in better agreement with the experiments than that of the other two models.
authors.affiliation: Key Laboratory of Coal Chemical Industry of Shandong Province, Zaozhuang University, Zaozhuang 277160, PR China. Electronic address: xiaoruirui603@163.com.
authors.forename: Ruirui
authors.initials: R
authors.lastname: Xiao
authors.affiliation: Key Laboratory of Coal Chemical Industry of Shandong Province, Zaozhuang University, Zaozhuang 277160, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Yang
mesh_terms: D001272:Atmosphere; D018533:Biomass; D002245:Carbon Dioxide / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D007700:Kinetics; D008962:Models, Theoretical; D010316:Particle Size; D016062:Porosity; D015203:Reproducibility of Results; D013696:Temperature; D014866:Waste Products
chemical_list: D014866:Waste Products; C540010:biochar; D002245:Carbon Dioxide; D002606:Charcoal
keywords: CO(2); Gasification kinetics model; Semi-char; Straw; TGA