Some statistical parameters for Miscanthus giganteus and Salix viminalis grinding using hammer mills
2018
Voicu, G., University Politehnica of Bucharest (Romania) | Moiceanu, G., University Politehnica of Bucharest (Romania) | Chitoiu, M., University Politehnica of Bucharest (Romania) | Cardei, P., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania)
In the present paper we present values of some parameters of the grinding process experimentally determined for a hammer mill used for grinding miscanthus stems and willow harvested with specific harvesting machines. The grinding energy according to three tuning parameters was determined: hammer rotor frequency, feeding flow and mill sieve orifice diameter, for two types of hammers (one or twoedge corners). Value sets of energy-feeding flow, energy – rotor rotation frequency, energy – sieve orifice diameter, were analysed, statistically determining the correlation between them, as well as other statistical parameters, using Excel MS Office (ex.covariance or kurtosis). If grinded biomass is willow, for the link between the energy and sieve orifice diameter the correlation shows a weak relation for one and two edge corner hammers, the two parameters being inversely proportional. Keeping in mind the fact that in the seven out of eight cases the correlation energy sieve orifice diameter presents an inversely proportional dependency, we can accept the hypothesis of reverse proportionality of the two parameters. In the paper, other comments are added regarding values obtained for all statistical parameters analysed for the two types of grinded biomass.
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