期刊
ENERGY
卷 165, 期 -, 页码 527-536出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2018.09.174
关键词
Hydrothermal carbonization; Corn stalk digestate; Hydrochar; Fuel property; Combustion
资金
- National Natural Science Foundation of China [51536009, 51276103, 51706127]
- Distinguished Expert of Taishan Scholars Shandong Province and Higher Education Superior Discipline Team Training Program of Shandong Province
In this study, hydrothermal carbonization (HTC) was employed to upgrade the fuel quality of corn stalk digestate (CSD) ranged from 190 to 240 degrees C. Meanwhile, a comparison of corn stalk (CS) was investigated to explore the effects of anaerobic digestion (AD) on the fuel property and combustion behavior of hydrochars. The results showed that the HTC increased the carbon content and heating value of hydrochars while decreased the alkali and alkaline earth metals (AAEMs) content and hydrophilicity. Compared to CS, the CSD showed higher low-temperature HTC activity, but lower sensitivity to temperature changes. The improvement of fuel properties on CSD was limited with the HTC temperature increasing. The thermogravimetric analysis displayed the relative low temperature HTC (190 and 215 degrees C) improved the combustion of CSD, while 240 degrees C was appropriate for CS. FTIR and SEM analyses confirmed the aromatization and formations of spherical particles in CS hydrochars obtained at 240 degrees C, respectively, but was not observed in CSD hydrochars. The AD process weakened the pyrolysis-like reaction of cellulose in HTC. Considering the energy balance and engineering, 190 degrees C was recommend for the preparation of solid fuels from CSD and seemed to be more viable for the combination of AD and HTC. (C) 2018 Elsevier Ltd. All rights reserved.
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