Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 146, Issue -, Pages 1-7Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2017.05.007
Keywords
Microwave hydrothermal pretreatment; Conventional hydrothermal pretreatment; Hydrochar properties; Pyrolysis behavior
Categories
Funding
- National Natural Science Foundation of China [21466022, 21266022]
- International Cooperation Project of MOST. PR China [2015DFA60170-4]
- Science and Technology Research Project of Jiangxi Province Education Department [GJJ150213]
- Innovation and Entrepreneurship Development Fund of Thousand talents program Talent [1001-02102082]
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development [Y707sb1001]
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Comparative study on microwave and conventional hydrothermal pretreatment of bamboo sawdust was carried out in this study. Microwave and conventional hydrothermal pretreatment both improved the hydrochar properties and its pyrolysis behaviors. Proximate and elemental analyses show that the properties of hydrochar from microwave hydrothermal pretreatment are better than conventional hydrothermal pretreatment in terms of calorific value and oxygen content except for 150 degrees C. Microwave hydrothermal pretreatment removes more acetyl groups in hemicellulose compared to conventional hydrothermal pretreatment, which may be attributed to the hot spot effect of microwave irradiation. The peaks of thermogravimetric and derivative thermogravimetric curves of pretreated samples always shifted to higher temperature region. Also, the conventional hydrothermal pretreated samples are more thermally stable than those by microwave heating. In addition, the glucopyranose content in pyrolysis vapors of microwave hydrothermal pretreated bamboo sawdust (190 degrees C) was 9.82% higher than that from conventional hydrothermal pretreated bamboo sawdust. However, the acids content from microwave hydrothermal pretreated bamboo sawdust (150 degrees C) was 4.12% lower. In this regard, microwave hydrothermal pretreatment is more suitable for upgrading the pyrolysis oil quality than conventional hydrothermal pretreatment. (C) 2017 Elsevier Ltd. All rights reserved.
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