Effect of industrial microwave irradiation on the physicochemical properties and pyrolysis characteristics of lignite

doi:10.1016/j.cjche.2017.11.002

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (5): 1171-1178.DOI: 10.1016/j.cjche.2017.11.002

• Energy, Resources and Environmental Technology • 上一篇下一篇

Effect of industrial microwave irradiation on the physicochemical properties and pyrolysis characteristics of lignite

Guoshun Zhou^1,2, Qunxing Huang¹, Ben Yu¹, Hui Tong³, Yong Chi¹, Jianhua Yan¹

1 State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China;
2 Everbright Environmental Research Institute(Nanjing) Limited, Nanjing 211100, China;
3 Kunshan Jiuhua Electronic Equipment Factory, Suzhou, 215300, China

收稿日期:2017-04-21 修回日期:2017-11-09 出版日期:2018-05-28 发布日期:2018-06-29
通讯作者: Qunxing Huang,E-mail address:hqx@zju.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (51621005) and the Fundamental Research Funds for the Central Universities (2017FZA4013).

Effect of industrial microwave irradiation on the physicochemical properties and pyrolysis characteristics of lignite

Guoshun Zhou^1,2, Qunxing Huang¹, Ben Yu¹, Hui Tong³, Yong Chi¹, Jianhua Yan¹

1 State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China;
2 Everbright Environmental Research Institute(Nanjing) Limited, Nanjing 211100, China;
3 Kunshan Jiuhua Electronic Equipment Factory, Suzhou, 215300, China

Received:2017-04-21 Revised:2017-11-09 Online:2018-05-28 Published:2018-06-29
Contact: Qunxing Huang,E-mail address:hqx@zju.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China (51621005) and the Fundamental Research Funds for the Central Universities (2017FZA4013).

摘要/Abstract

摘要： The surface functional groups and pyrolysis characteristics of lignite irradiated by microwave were comparatively studied to evaluate the feasibility of using industrial 915 MHz for lignite drying. The drying kinetics, micro structure, chemical functional groups, re-adsorption properties, and pyrolysis characteristics of the dried coal were respectively analyzed. Results indicated that for typical Chinese lignite studied in this paper, 915 MHz microwave drying was 7.8 times faster than that of the hot air drying. After industrial microwave drying, the sample possessed much higher total specific surface area and specific pore volume than that of air dried sample. The oxygen functional groups and re-adsorption ratio of microwave irradiated coal decreased, showing weakened hydrophilicity. Moreover, during the pyrolysis of the coal dried by hot air and microwave, the yield of tar largely increased from 1.3% to 8.5% and the gas production increased correspondingly. The composition of the tar was also furtherly analyzed, results indicated that Miscellaneous hydrocarbons (HCs) were the main component of the tar, and microwave irradiation can reduce the fraction of polycyclic aromatic hydrocarbons (PAHs) from 26.4% to 22.7%.

关键词: Lignite, Industrial microwave, Physicochemical properties, Pyrolysis characteristics

Abstract: The surface functional groups and pyrolysis characteristics of lignite irradiated by microwave were comparatively studied to evaluate the feasibility of using industrial 915 MHz for lignite drying. The drying kinetics, micro structure, chemical functional groups, re-adsorption properties, and pyrolysis characteristics of the dried coal were respectively analyzed. Results indicated that for typical Chinese lignite studied in this paper, 915 MHz microwave drying was 7.8 times faster than that of the hot air drying. After industrial microwave drying, the sample possessed much higher total specific surface area and specific pore volume than that of air dried sample. The oxygen functional groups and re-adsorption ratio of microwave irradiated coal decreased, showing weakened hydrophilicity. Moreover, during the pyrolysis of the coal dried by hot air and microwave, the yield of tar largely increased from 1.3% to 8.5% and the gas production increased correspondingly. The composition of the tar was also furtherly analyzed, results indicated that Miscellaneous hydrocarbons (HCs) were the main component of the tar, and microwave irradiation can reduce the fraction of polycyclic aromatic hydrocarbons (PAHs) from 26.4% to 22.7%.

Key words: Lignite, Industrial microwave, Physicochemical properties, Pyrolysis characteristics

Guoshun Zhou, Qunxing Huang, Ben Yu, Hui Tong, Yong Chi, Jianhua Yan. Effect of industrial microwave irradiation on the physicochemical properties and pyrolysis characteristics of lignite[J]. Chinese Journal of Chemical Engineering, 2018, 26(5): 1171-1178.

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Effect of industrial microwave irradiation on the physicochemical properties and pyrolysis characteristics of lignite

Effect of industrial microwave irradiation on the physicochemical properties and pyrolysis characteristics of lignite

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