Effects of microwave-assisted pyrolysis on the microstructure of bituminous coals

被引：211

作者：

Li, He ^{[1
]}

Shi, Shiliang ^{[1
]}

Lin, Baiquan ^{[2
]}

Lu, Jiexin ^{[1
]}

Ye, Qing ^{[1
]}

Lu, Yi ^{[1
]}

Wang, Zheng ^{[2
]}

Hong, Yidu ^{[3
]}

Zhu, Xiangnan ^{[4
]}

机构：

[1] Hunan Univ Sci & Technol, Sch Resource Environm & Safety Engn, Xiangtan 411201, Hunan, Peoples R China

[2] China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Jiangsu, Peoples R China

[3] Chinese Acad Sci, Haixi Inst, Quanzhou Inst Equipment Mfg, Quanzhou 362000, Fujian, Peoples R China

[4] Shandong Univ Sci & Technol, Coll Chem & Environm Engn, Qingdao 266590, Shandong, Peoples R China

来源：

ENERGY | 2019年 / 187卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Microwave-assisted pyrolysis; Bituminous coal; Molecular structure; Pore structure; Fracture; PORE STRUCTURE; EVOLUTION CHARACTERISTICS; MERCURY INTRUSION; JUNGGAR BASIN; HEAT-TRANSFER; RANK COALS; IRRADIATION; CHINESE; LIGNITE; PRETREATMENT;

D O I：

10.1016/j.energy.2019.115986

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Microwave-assisted pyrolysis (MWAP) provides distinctive heating for the conversion of coal into liquid fuels. This work investigated the effects of MWAP on the microstructure of bituminous coals by using Fourier transform infrared spectroscopy (FTIR), mercury intrusion porosimetry (MIP) and Scanning Electron Microscope (SEM) techniques. FTIR results showed that MWAP can lead to the decomposition of oxygen functional groups and aliphatic hydrocarbons. Removal of these hydrophilic groups significantly weakens the hydrophilicity of coal. With continuous exposure to microwaves, unstable components such as alcohol, phenol and carboxylic acid are converted into ether groups. Cyclization and aromatization induced by microwave heating improve the maturation of coal. MIP and SEM results indicated that the jet force exerted by the high-pressure steam and gaseous products under MWAP gives a great boost to the opening, enlargement and connection of pores. Furthermore, the thermal stresses induced by microwave selective heating enlarge the fractures and create new cracks, providing seepage space for fluids. MWAP of bituminous coals can not only release moisture and volatiles but also create seepage space by modifying the pore and fracture structure. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：14

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