Abstract
Vibrations occurring during road transport can vary in a wide spectrum and they can lead to losses in quality of transported materials. However, the vibrations are definitely different than the loads experienced by pellet samples in the tester used for durability tests according to the standard ISO 17831-1. pThe aim of the study was to evaluate the durability of wood biomass pellets available for sale in large-area stores, in terms of loads occurring in transport. The durability of the ellets was tested by subjecting them to vertical and horizontal vibrations similar to those occurring during local transport of this type of fuel for the needs of households. Durability tests were also carried out in accordance with ISO 17831-1. The results were analyzed statistically. Among other, it was found that the vibration time impact on the tested pellet durability was significantly lower in case of horizontal vibrations than in vertical. Moreover, pellets with a diameter of 8 mm showed lower durability than pellets with a diameter of 6 mm. Durability tests carried out in accordance with ISO 17831-1 showed lower pellet strength results compared to the test methods based on lateral and vertical vibrations.
Highlights
When analyzing the issue of pellet durability, this concept should be defined
The results of durability tests taking into account vertical vibrations were presented graphically in Figures 4 and 5
Wood biomass pellets have a very large potential when it comes to combustion in central heating
Summary
When analyzing the issue of pellet durability, this concept should be defined. Durability is a quality feature that belongs to the mechanical parameters of solid fuels. It is the main physical quality parameter considered by industry [1]. It can be defined as the resistance of the fuel to shocks or abrasion generated during the processes related to distribution and transport. According to the definition given by [2] mechanical durability means the ability of pellets to withstand destructive loads and forces during transportation, storage and handling. Low pellet durability is not desirable, because, as it was mentioned earlier—if the pellet crumbles may cause problems of dirt in the stove, cause disturbances within automatic pellet feeding systems; it may be problems of reduced combustion efficiency and increased emissions [1,3,4]
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