An Experimental Study on Preparation of Reconstituted Tectonic Coal Samples: Optimization of Preparation Conditions

Jishi Geng, Liwen Cao, Congyu Zhong and Shuai Zhang
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Jishi Geng: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Liwen Cao: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Congyu Zhong: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Shuai Zhang: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China

Energies, 2021, vol. 14, issue 10, 1-17

Abstract: The uniquely soft and fragile nature of tectonic coal makes it difficult to obtain core samples suitable for laboratory experimentation. Preparation of reconstituted tectonic coal (RTC) samples generally adopts the secondary forming method. Reliable coal samples are needed to obtain credible permeability and mechanical parameters that can guide Coalbed Methane (CBM) extraction and improve mining safety. In this study, the compaction mechanism of coal particles is analyzed based on the Kawakita model, and optimal sample preparation conditions are systemically investigated, particularly particle size and particle size distribution, forming pressure, and moisture content. The density and P-wave velocity of coal samples were used to test whether the RTC samples were realistic. Finally, the mechanical properties and deformation characteristics of the RTC samples were determined. The results indicate that RTC samples prepared for laboratory testing of mechanical properties require (1) the original particle size of the tectonic coal to be retained as much as possible; (2) a forming pressure that compacts the sample similar to the original tectonic coal; and (3) an optimum moisture content.

Keywords: tectonic coal particles; reconstituted coal; compaction mechanism; mechanical properties; effectiveness evaluation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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