title: Determination of the intrinsic reactivities for carbon dioxide gasification of rice husk chars through using random pore model.
abstract: Rice husk is abundantly available and environmentally friendly, and char-CO2 gasification is of great importance for the biomass gasification process. The intrinsic reaction rates of carbon dioxide gasification with rice husk chars derived from different pyrolysis temperatures were investigated in this study by conducting thermogravimetric analysis (TGA) measurements. The effects of gasification temperature and reactant partial pressure on the char-CO2 gasification were investigated and the random pore model (RPM) was used to determine the intrinsic kinetic parameters based on the experimental data. The results obtained from this study show that the activation energy, reaction order and pre-exponential factor varied in the ranges of 226.65-232.28kJ/mol, 0.288-0.346 and 2.38×10(5)-2.82×10(5)1/sPa(n) for the rice husk chars pyrolyzed at 700-900°C, respectively. All the determination coefficients between the RPM predictions and experimental results were higher than 0.906, indicating the RPM is reliable for determining and evaluating the intrinsic reactivities of rice husk chars.
authors.affiliation: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Gao
authors.affiliation: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China; School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, China. Electronic address: ynzhang@hit.edu.cn.
authors.forename: Yaning
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China.
authors.forename: Bingxi
authors.initials: B
authors.lastname: Li
authors.affiliation: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China.
authors.forename: Yijun
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China.
authors.forename: Baocheng
authors.initials: B
authors.lastname: Jiang
mesh_terms: D018533:Biomass; D002245:Carbon Dioxide / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D007700:Kinetics; D008962:Models, Theoretical; D012275:Oryza / Q000737:chemistry*; D015203:Reproducibility of Results; D013696:Temperature; D014866:Waste Products
chemical_list: D014866:Waste Products; C540010:biochar; D002245:Carbon Dioxide; D002606:Charcoal
keywords: Carbon dioxide gasification; Intrinsic reactivity; Random pore model; Rice husk char