Abstract
The presence and generation of fines and dust in the bulk of biomass pellets have inflicted several problems in the supply chain during transportation and storage, and the breakage behavior of pellets has been scarcely studied so far. Fines and dust are the consequences of impact and abrasive forces through the whole supply chain; however, the breakage happens at the particle level. Therefore, to study the fines generation, first, the breakage behavior of individual pellets should be understood, and then, the behavior of the bulk materials in operational conditions can be investigated. This paper aims to investigate the breakage behavior of individual pellets under experimental compression tests and to introduce a calibrated numerical model using discrete element method (DEM) in order to pave the way for further studies on pellet breakage. For that purpose, seven different types of biomass pellets were studied experimentally, and then, a calibrated model was introduced via the Timoshenko–Ehrenfest beam theory using DEM. Results show that the model could reasonably predict the breakage behavior of pellets under uniaxial and diametrical compressions. The findings could help to develop a new design of the equipment for transportation and handling of biomass pellets with the aim to reduce the amount of generating fines and dust.
Highlights
The fragmentation of biomass pellets and the generation of fines and dust during transport and storage have inflicted several problems in handling steps and operational units [1]
In a typical compression test, a single pellet is placed between two anvils of a compression device that compress the pellet while recording the force–displacement data
The results of the experimental compression tests, as well as the pellet densities are shown in Table 4, and a typical stress–strain curve for uniaxial and diametrical compressions of torrefied mixed wood pellets is depicted in Fig. 7, as an example
Summary
The fragmentation of biomass pellets and the generation of fines and dust during transport and storage have inflicted several problems in handling steps and operational units [1]. In a typical compression test, a single pellet is placed between two anvils of a compression device that compress the pellet while recording the force–displacement data. In a typical impact test, a single pellet is dropped from a known height to a plate of known material and the number of fines, and the number of pieces split from the original pellet is recorded. The bulk strength is typically measured using durability testers such as tumbling can, ligno tester, and Holmen durability tester. These devices enable pellets to collide with each other and with the walls to mimic the transportation and handling conditions by use of an air stream or rotating the device
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