title: The densification of bio-char: Effect of pyrolysis temperature on the qualities of pellets.
abstract: The densification of bio-chars pyrolyzed at different temperatures were investigated to elucidate the effect of temperature on the properties of bio-char pellets and determine the bonding mechanism of pellets. Optimized process conditions were obtained with 128MPa compressive pressure and 35% water addition content. Results showed that both the volume density and compressive strength of bio-char pellets initially decreased and subsequently increased, while the energy consumption increased first and then decreased, with the increase of pyrolysis temperature. The moisture adsorption of bio-char pellets was noticeably lower than raw woody shavings but had elevated than the corresponding char particles. Hydrophilic functional groups, particle size and binder were the main factors that contributed to the cementation of bio-char particles at different temperatures. The result indicated that pyrolysis of woody shavings at 550-650°C and followed by densification was suitable to form bio-char pellets for application as renewable biofuels.
authors.affiliation: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Hu
authors.affiliation: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Haiping
authors.initials: H
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Dingding
authors.initials: D
authors.lastname: Yao
authors.affiliation: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Danchen
authors.initials: D
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Xianhua
authors.initials: X
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Jingai
authors.initials: J
authors.lastname: Shao
authors.affiliation: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China. Electronic address: fbghust@163.com.
authors.forename: Hanping
authors.initials: H
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D056804:Biofuels; D018533:Biomass; D001709:Biotechnology; D002244:Carbon / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry*; D019245:Compressive Strength; D006358:Hot Temperature; D057927:Hydrophobic and Hydrophilic Interactions; D008031:Lignin / Q000737:chemistry; D010316:Particle Size; D011312:Pressure; D014867:Water / Q000737:chemistry; D014934:Wood
chemical_list: D056804:Biofuels; C540010:biochar; D014867:Water; D002606:Charcoal; D002244:Carbon; D008031:Lignin
keywords: Bio-char; Bonding mechanism; Pelletization; Pyrolysis temperature; Quality