Influence of pressure and temperature on key physicochemical properties of corn stover-derived biochar

FUEL

卷:186

Article

Azuara, Manuel¹  Baguer, Barbara²  Villacampa, Jose I.¹  Hedin, Niklas³  Manya, Joan J.⁴ 

[1] Univ Zaragoza, INA, E-50009 Zaragoza, Spain

[2] Univ Zaragoza, Technol Coll Huesca, E-50009 Zaragoza, Spain

[3] Stockholm Univ, Arrhenius Lab, Dept Mat & Environm Chem, Stockholm, Sweden

[4] Univ Zaragoza, Aragon Inst Engn Res I3A, E-50009 Zaragoza, Spain

关键词: Corn stover;    Pyrolysis;    Biochar;    Aromatic carbon;    Pressure;   

DOI  :  10.1016/j.fuel.2016.08.088

来源: Elsevier

【 摘 要 】

This study focuses on analyzing the effect of both the peak temperature and pressure on the properties of biochar produced through slow pyrolysis of corn stover, which is a common agricultural waste that currently has little or no value. The pyrolysis experiments were carried out in a fixed-bed reactor at different peak temperatures (400, 525 and 650 degrees C) and absolute pressures (0.1, 0.85 and 1.6 MPa). The inert mass flow rate (at NTP conditions) was adjusted in each test to keep the gas residence time constant within the reactor. The as-received corn stover was pyrolyzed into a biochar without any physical pre-treatment as a way to reduce the operating costs. The properties of biochars showed that high peak temperature led to high fixed-carbon contents, high aromaticity and low molar H:C and O:C ratios; whereas a high pressure only resulted in a further decrease in the O:C ratio and a further increase in the fixed-carbon content. Increasing the operating pressure also resulted in a higher production of pyrolysis gas at the expense of water formation. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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