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Drying Technology
An International Journal
Volume 36, 2018 - Issue 5
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ARTICLES

Assessing the moisture migration during microwave drying of coal using low-field nuclear magnetic resonance

He LiSchool of Safety Engineering, Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, ChinaView further author information
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Baiquan LinSchool of Safety Engineering, Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, ChinaCorrespondence[email protected]
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Yidu HongSchool of Safety Engineering, Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, ChinaView further author information
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Tong LiuSchool of Safety Engineering, Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, ChinaView further author information
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Zhanbo HuangSchool of Safety Engineering, Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, ChinaView further author information
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Rui WangSchool of Safety Engineering, Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, ChinaView further author information
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Zheng WangSchool of Safety Engineering, Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, ChinaView further author information
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Pages 567-577 | Received 07 Apr 2017, Accepted 27 Jun 2017, Published online: 03 Oct 2017
 
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ABSTRACT

Microwave drying of coal has the advantage of volumetric and selective heating, which saves energy and time. However, comprehensive assessment of the moisture migration during microwave drying is lacking. In this study, the low-field nuclear magnetic resonance (LF-NMR) was used for moisture characterization during microwave drying. Moisture migration occurs first in larger pores, whereas the smaller pores appear to remain water-saturated. As the microwave power increases, the drying capacity and drying rate both increase because high-power microwave can open the blind pores to promote moisture seepage. Furthermore, moisture migration during microwave drying is usually directional (i.e., along the bedding plane). The LF-NMR method provides a framework for the determination of moisture migration of coals.

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Funding

This work was supported by the Fundamental Research Funds for the Central Universities (2017BSCXB06).

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