Abstract
The knowledge of a grinder structure, its performance parameters and characteristics of biomaterials breakage are crucial for this research whose aim is to determine the dependencies between performance parameters and comminution indicators. The aim of this study is to investigate the relationships between multi-disc mill performance parameters such as discs angular speed, batch dosing speed and comminution characteristics: power consumption, specific energy consumption, throughput and size reduction ratio. To achieve these goals, an experiment was conducted on a five-disc mill with a special monitoring system. The research program was established, with disc angular speed at different configurations and different batch dosing speeds. The results show that power consumption, specific energy consumption and size reduction ratio depend on the total increase in angular speed of discs SΔω in such a way that an increase in SΔω causes an increase in the abovementioned comminution indicators. In turn, an increase in batch dosing speed W causes an increase in throughput. The fitting curves of comminution indicators in dependence of selected performance parameters are also presented in this study.
Highlights
Comminution is a process that results in particle breakage caused by the impact of the mill structural elements and/or contacts between moving particles [1].As was studied so far, comminution could be an effect of crushing, attrition, cutting, splitting, bending, breaking and hitting [2]
The results presented in Figures andwas results of correlation the was partial correlation analysis, when batch dosing4–7 speed selected as a conanalyses (Tables show that power consumption, specific energy consumption size trolling variable, the values of correlation coefficients between variables (Tables and were slightly higher than those obtained from Pearson analysis (Table 3), which suggests that the values of power consumption, specific energy consumption and size reduction ratio depend mostly on total increase in disc angular speeds and subsequently on the disc speed
When total increase in disc angular speeds was selected as a controlling variable, reduction ratio depend on the total increase in disc angular speed S∆ω in such a way that the increase in S∆ω causes an increase in the considered comminution indicators
Summary
Comminution is a process that results in particle breakage caused by the impact of the mill structural elements and/or contacts between moving (often very fast) particles [1].As was studied so far, comminution could be an effect of crushing, attrition, cutting, splitting, bending, breaking and hitting [2]. The choice of the best grinding method depends primarily on the properties of the material to be comminuted; for example, cutting is recommended for woody biomass while for brittle materials, crushing or impact comminution will be more suitable [3,4]. Despite significant technological progress in the design of mills, the problem of these machines is high energy consumption and low efficiency [6,7]. To resolve this problem, the knowledge of the relations between structural features of the mills, the process parameters and the comminuted material properties is needed
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