Experimental research on evolution over time of fir tree sawdust pellets
2021
Gageanu, I., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Cujbescu, D., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Persu, C., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Gheorghe, G., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania)
The technological process of biomass densification by pelleting has a number of special characteristics that fundamentally distinguish it from the densification of other types of materials, due to the fact that biomass densification is strongly influenced by a multitude of disruptive factors that need to be further studied. For this reason, it is important to take into account these disruptive factors in conducting experiments and interpreting data in a direct connection with the conditions for conducting experimental tests. In the practice of biomass densification, it was found that between the output parameters expressing the quality of pellets obtained and the accumulation of influencing factors represented by the properties of the material and compression conditions there is a strong link, regulating these factors is essential in obtaining a quality solid biofuel. The influence of these factors should be considered both during the process of biomass densification, as well as in the following period of time. The paper presents the results of monitoring pellets obtained from biomass pelleting experiments performed, represented by fir sawdust resulting from wood processing. Monitoring the evolution of the physical characteristics of pellets over time is a mandatory test for estimating the quality of pellets. The variation of the length of the pellets in time, from the exit from the formation process (the initial zero time) to the last day of following their evolution, is an important parameter that gives an overview of the stabilization tendencies of the pellets. The results obtained showed an average expansion between 0.62 and 0.82 mm for pellets obtained at 10% material moisture, a contraction between 0.61 and 1.55 for 13% material moisture and an even larger contraction, between 2.86 and 3.95 mm, for 16% material moisture, depending on the compaction force used.
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