title: Effects of volatile-char interactions on char during pyrolysis of rice husk at mild temperatures.
abstract: In order to understand the sensitivity of volatile-char interactions to mild temperatures (600-800°C), in-situ rice husk char was prepared from fast pyrolysis (>10(3)Ks(-1)) on a fixed-bed reactor. Retention of K in char, changes in char structure and char reactivity were determined. The results showed that volatile-char interactions did not cause obvious effect on the char yield but showed an inhibitory effect on char reactivity. The inhibition began only above 650°C and intensified with temperature rise, but kept almost unchanged at 700-800°C. Char structure and retention of K have a combined effect on char reactivity. The decreased reactivity was caused by additional volatilization of K from char matrix and transformation of relatively smaller aromatic ring systems to large ring systems (>6 benzene rings) above 650°C.
authors.affiliation: Combustion Engineering Research Institute, School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR China.
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.affiliation: Combustion Engineering Research Institute, School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR China. Electronic address: zhaoyijun@hit.edu.cn.
authors.forename: Yijun
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Combustion Engineering Research Institute, School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR China.
authors.forename: Yangzhou
authors.initials: Y
authors.lastname: Guo
authors.affiliation: Combustion Engineering Research Institute, School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR China.
authors.forename: Dongdong
authors.initials: D
authors.lastname: Feng
authors.affiliation: Combustion Engineering Research Institute, School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR China.
authors.forename: Jiangquan
authors.initials: J
authors.lastname: Wu
authors.affiliation: Combustion Engineering Research Institute, School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR China.
authors.forename: Pengxiang
authors.initials: P
authors.lastname: Wang
authors.affiliation: Combustion Engineering Research Institute, School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR China.
authors.forename: Shaozeng
authors.initials: S
authors.lastname: Sun
mesh_terms: D002606:Charcoal / Q000737:chemistry*; D012275:Oryza / Q000737:chemistry*; D013696:Temperature; D014835:Volatilization
chemical_list: C540010:biochar; D002606:Charcoal
keywords: Char reactivity; Mild temperatures; Potassium; Structure; Volatile–char interactions