Effect of Particle Sizes on the Physical and Mechanical Properties of Briquettes

Longlong Pang, Yuzhong Yang, Liyun Wu, Fei Wang and Han Meng
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Longlong Pang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
Yuzhong Yang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
Liyun Wu: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
Fei Wang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
Han Meng: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China

Energies, 2019, vol. 12, issue 19, 1-16

Abstract: The particle size of coal particles is an important factor affecting the physical and mechanical properties of coal. In this study, uniaxial and triaxial compression tests were conducted to investigate the effects of coal particle size on the physical and mechanical properties of briquettes and their impact mechanism using a rock mechanics test-150B servo system (RMT-150B). The results showed that the uniaxial compression strength, elastic modulus and deformation modulus of briquettes increase when particle size is decreased. The deformation characteristics of the briquettes directly prepared by raw tectonic coal were similar to those of coal specimens with a particle size of 0.18–0.25 mm. The cohesion and strength of coal specimens increased when particle size was decreased, and the plastic deformation capacity decreased when particle size was decreased, showing a strong correlation. The f briquette directly prepared by the raw tectonic coal had a strength between that of coal specimens with a particle size of 2–6 mm and those with a particle size of 0.18–0.25 mm. The mechanical properties of briquettes mainly depend on the meshing force between the coal particles. The smaller the particles, the greater the mechanical meshing force. The “floating particles”, generated in the voids between coal particles during the preparation process, are a significant factor affecting the plasticity characteristics. The research results may be used as a basic reference in the study of the mechanical properties of tectonic coal, gas migration and coal and gas outburst mechanisms.

Keywords: briquette; particle size; coal and gas outburst; physical and mechanical property; floating particles (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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