Journal
BIORESOURCE TECHNOLOGY
Volume 269, Issue -, Pages 96-103Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.08.082
Keywords
Hydrothermal carbonization; Wheat straw; Hydrochar evolution; Combustion properties
Funding
- Program for Changjiang Scholars and Innovative Research Team in Ministry of Education of China [IRT-17R1293]
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In order to upgrade wheat straw, hydrothermal treatment at 160-240 degrees C was investigated. Meanwhile, the influence of temperature and leaching on the fuel's physicochemical and combustion properties were explored. A temperature of 180-220 degrees C was found to benefit the generation of hydrochar, with solid and energy yields of at least 57.3% and 69.9%, respectively. When temperature increased to 160 degrees C, hemicellulose was hydrolyzed and this led to the formation of carbon microspheres. The diameter of the carbon microspheres reached 0.05-0.7 mu m. Hydrochars obtained at 160, 180, and 200 degrees C exhibited better combustion performance with higher comprehensive combustibility index value. While leaching heavily impacted the hydrochar derived at 160 degrees C and increased its activation energy (178 kJ/mol) above those obtained for treatment at 180 degrees C (164 kJ/mol) and 200 degrees C (169 kJ/mol). Overall, the recommended hydrothermal temperature for production of fuel from wheat straw is 180-200 degrees C.
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