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Analýza využití matoliny pro separaci semen a energetické účely
Ludín, David
Empirical measurements took place in years 2013 until 2015 at grape marc samples from viniculture subjects in the wine-growing area Morava. The results of this paper are divided into two main parts grapevine seed separation from grape marc and grape marc usage for energy purposes. Efficiency evaluation of the separation process was implemented primarily empirically in laboratory conditions by means of a net with defined-sized loops. Subsequently, the efficiency was confirmed on a prototype of a vibrating sifting device. From obtained results follows, in dependence on the cultivar the separation efficiency varies between 58,35 until 94,12 %, while seed yield is 6,00 until 49,71 %. An interesting area of grape seed usage is bioenergetics. Therefore there was implemented a wide range of calorimetrical measurements of combustion heat and caloric power of grape marc in its original state, grape marc after seed separation (assumption of oil pressing usage), and seeds in themselves. The results indicate the heating power varies between 18,61 until 21,14 MJ/kg. The highest heating power values were stated by seeds and grape marc in its original state. It could be presumed, the main reason is rather high oil component in grapevine seeds. Moreover, the measurement set was supplemented by results focused on grape marc usage for pellet production. As the input materials different proportions of dried grape marc combined with wine shoots and hay were used. From the measured values follows, that the highest heating power (19,22 MJ/kg) was obtained from pellets composited from 60 % grape marc, 20 % wine shoots, and 20 % hay. Their apparent density is 630,9 kg.m-3. The produced pellets correspond with the norm CSN EN 15210 2 from the point of view of mechanical ruggedness. The results of this paper were as well extended by a set of model calculation of operating expenses when producing pellets in defined conditions, which vary between CZK 3,59 until 3,92 per 1 kilogram.
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