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

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.

Empirical Studies on Biomass Briquette Production: A Literature Review

“…When working with smaller particles there is also an increase in the contact area by decreasing the distance between them, promoting the strong connection of mechanical interlocking forces, chemical forces, solid bridge connection and van der Waals force, which consequently has an influence on the mechanical properties of briquettes [73]. This increase in contact points also facilitates heat transfer, strengthening the bonds between particles, which in turn can give solid fuels a higher apparent density, energy density, durability, axial compression resistance, impact resistance and modulus of elasticity [73][74][75].…”

Influence of Parallel Joint Spacing and Rock Size on Rock Bulk Modulus

“…For instance, the change in the size of some sedimentary rocks rich in joints fundamentally affects the change in the rock bulk modulus [10]. In this regard, Pang et al [11] demonstrated that the bulk modulus of coal increases with a decrease in particle size. Jiang [12] reported that the size of the rock particles affects the rock pore structure, thereby triggering changes in the rock bulk modulus.…”

Evolution of Mechanical Properties and Acoustic Emission Characteristics in Uniaxial Compression: Raw Coal Simulation Using Briquette Coal Samples with Different Binders

“…Zhao et al 43 carried out a triaxial experiment on briquette coal samples, and the AE characteristics and damage equation were derived. Pang et al 44 carried out uniaxial and triaxial compression tests on briquette coal samples with different particle sizes and found that their mechanical parameters improved with decreasing particle size.…”