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it was not a sophisticated system, but it provided sufficiently accurate results for the purpose intended. Some biomasses, with different particle size, were tested. A direct correlation was observed between the maximum applied pressure, the final briquette density and the briquette quality; moreover, it was shown that the final density of good quality briquettes depended on the biomass type, varying from 0. 74 – 0. 85 g/cm3 for straw to about 1 g/cm3 for grass, but, on the other hand, a maximum compaction pressure of 580 bar was sufficient with all biomasses for obtaining good briquettes. The tests showed that dry biomass compaction can be divided into two steps: first, the biomass undergoes a large volume reduction, with low opposing pressure: this step can be limited to an applied pressure of about 40 bar; subsequently, a further slight volume reduction follows, whilst the opposing pressure rapidly grows. The biomass relative volume (Vrel) corresponding to 40 bar pressure is variable, due to differences in biomass characteristics and particle size, but when this pressure is exceeded, the curves have similar shapes, although they are differently positioned on the abscissa. This suggested that a unique mathematical relationship could model the behaviour of different kinds of biomass, as long as a parameter for biomass variability was allowed: the obtained relationship was Equation (1) as in this paper.
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