Effect of Torrefaction on Properties of Pellets Produced from Woody Biomass

被引:55
|
作者
Wang, Liang [2 ]
Riva, Lorenzo [1 ]
Skreiberg, Oyvind [2 ]
Khalil, Roger [2 ]
Bartocci, Pietro [3 ]
Yang, Qing [4 ]
Yang, Haiping [5 ]
Wang, Xuebin [6 ]
Chen, Dengyu [7 ]
Rudolfsson, Magnus [8 ]
Nielsen, Henrik Kofoed [1 ]
机构
[1] Univ Agder, Dept Engn Sci, N-4898 Grimstad, Norway
[2] SINTEF Energy Res, N-7034 Trondheim, Norway
[3] Univ Perugia, Dept Engn, I-06125 Perugia, Italy
[4] Huazhong Univ Sci & Technol, China EU Inst Clean & Renewable Energy, Wuhan 430074, Hubei, Peoples R China
[5] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, State Key Lab Coal Combust, Wuhan 430074, Hubei, Peoples R China
[6] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China
[7] Nanjing Forestry Univ, Coll Mat Sci & Engn, Nanjing 210037, Jiangsu, Peoples R China
[8] Swedish Univ Agr Sci, Dept Forest Biomat & Technol, SE-90183 Umea, Sweden
关键词
TORREFIED WOOD; LOGGING RESIDUES; SAWDUST; QUALITY; PELLETIZATION; DENSIFICATION; GRINDABILITY; DURABILITY; PARAMETERS; BREAKAGE;
D O I
10.1021/acs.energyfuels.0c02671
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Torrefaction has been recognized as a promising strategy to improve handling and storage properties of wood-based pellets, thus producing a uniform-quality commodity with high energy density and hydrophobicity. In this work, pellets produced from spruce stem wood, bark, and forest residues were torrefied in a bench-scale tubular reactor at 225 and 275 degrees C with two residence times (30 and 60 min). The effects of torrefaction on general properties, grindability, mechanical properties, hydrophobicity, and microstructure of the studied pellets were investigated. The increase of torrefaction severity reduced mass yields, but the heating values and the fixed carbon content of the torrefied pellets considerably increased. The grindability of raw pellets was substantially improved after torrefaction treatment. The energy required for grinding torrefied pellets is less than 50% of the energy needed for grinding the untreated pellets. In comparison to untreated pellets, the particles from ground torrefied pellets have clearly smaller sizes in a narrower size range. The increase of torrefaction severity improved hydrophobicity of the pellets, which have high resistance to water uptake and maintain their integrity after immersion testing. Upon torrefaction treatment, the durability and tensile strength of the pellets slightly decreased. Scanning electron microscopy analysis results show that particles from wood pellets torrefied at 275 degrees C lost their fibrous structure with an evident decrease of length/diameter ratios compared to untreated wood pellets. The particles from ground torrefied pellets are more uniform in terms of shape and size. Torrefaction can considerably improve grindability and uniformity of wood-based pellets and make them more acceptable in pulverized fuel applications.
引用
收藏
页码:15343 / 15354
页数:12
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