Effect of the cleaning process on physical properties for different malting barley seed varieties

The aim of the study was to investigate the influence of the barley cleaning process in relation to physical properties. The knowledge of the range of changes in the physical parameters of processed material and their mutual relationships is required for the design and implementation of various technological processes. In this study were compared the input and output commodities in the primary postharvest cleaning process of undesirable components-occurring as admixtures of fine and coarse barley impurities as well as the barley component itself. An efficient cleaning process ensuring barley grain quality is a basic step in beer production. Therefore, seven bred varieties of brewing barley (Malz, Sebastian, Francin, KWS Irina1, KWS Irina2, Bojos, and Laudis) were tested for the qualitative assessment of the cleaning process. Physical parameters such as granulometry, bulk and tapped density, angle of repose, internal and wall friction angle, and flow functions were determined for all samples. In order to identify whether the barley variety or the sample cleaning significantly influences the determined physical properties, two-way ANOVA was applied. The results imply that barley cleaning had the main influence on wall friction angle, while the barley variety had a significant effect on effective internal friction. Moreover, the mechanical postharvest cleaning process reduces the overall wall friction.Web of Scienc

Hoist

Import 26/06/2013PROKEŠ, R. Kladkostroj: bakalářská práce. Ostrava: VŠB – Technická univerzita Ostrava, Fakulta strojní, Katedra výrobních strojů a konstruování, 2013, 51 s. Vedoucí práce: Učeň, O. Bakalářská práce se zabývá konstrukčním návrhem jeřábové kočky, která bude sloužit k pohybu s břemenem ve výrobní hale. Jeřábová kočka se pohybuje po jednonosníkovém mostovém jeřábu rychlosti pojezdu 20 [m/min]. Pojezd jeřábové kočky tvoří elektropřevodovka, která pohání dvě kola. Maximální nosnost dopravovaného břemene je 10 [t]. Zdvih břemene zajišťuje elektropřevodovka s brzdou do zdvihové výšky 15 [m] rychlosti zdvihu 8 [m/min]. Bakalářská práce obsahuje výpočty zdvihu a pojezdu jeřábové kočky a dále jsem provedl pevnostní kontrolu kritických míst navržené nosné konstrukce.PROKEŠ, R. Hoist: Bachelor’s thesis. Ostrava: VŠB - Technical University of Ostrava, Faculty of Mechanical Engineering, Department of Production Machines and Design, 2013, 51 p. Bachelor’s thesis supervisor: Učeň, O. This Bachelor’s thesis is engaged in structural design of the travelling crab, which will be used for movement with load in the production hall. The travelling crab moves at single-girder overhead cranes and travelling speed is 20 [m/min]. Running gear of the travelling crab contains the electric gearbox, which drives two wheels. Maximal load capacity of transported load is 10 [t]. Lift of the load ensures the electric gearbox with the brake to lifting height of 10 [m], and lifting speed of 8 [m/min]. The Bachelor’s thesis included calculation of lifting, movement of the travelling crab and stress analysis of critical points of designed construction.340 - Katedra výrobních strojů a konstruovánívýborn

Wood pellets transport with vibrating conveyor: Experimental for DEM simulations analysis

This work presents a comprehensive overview of the mechanical-physical parameters of the transport material affecting the vibratory transport. For this purpose, spruce pellets of different lengths, oak rods and spruce crush were tested. The determined parameters were particle size distribution and shape, internal friction, static and dynamic angle of repose. The samples were transported by a patented validation vibrating conveyor. Various settings were used. The results show that by changing the shape, it is possible to reduce friction or resistance as well as energy intensity during transport. It was observed that perfect shapes and lighter particles have lower friction, but a more pronounced bounce. Therefore, it does not form a typical pattern during transport, as in the case of an imperfectly shaped one. There is also included a simulation of the discrete element method. The study shows the possibility of the vibration machine where the material can be conveyed either directionally or sorted.Web of Science111art. no. 1660

The pelletization and torrefaction of coffee grounds, garden chaff and rapeseed straw

Waste biomass pelletization is a suitable process for obtaining energy dense solid fuel. If the pellets are further processed by torrefaction, both their qualitative and energy parameters are changed. Therefore, the objective of this study is to investigate the effect of the torrefaction process on pellets made from coffee grounds, garden chaff and rapeseed straw. Mechanical parameters, such as the pellet durability index, the wettability index of the pellets, their water moisture resistance, hardness, or specific and bulk density were determined for evaluation. Furthermore, pellet energy parameters such as the heat of combustion, calorific value, or elemental analysis were compared. Pelletization of the above-mentioned waste biomass and the torrefaction of the pellets were carried out in pilot plants. The first results showed that the torrefaction process for all samples increased the values of the heat of combustion or the values of the carbon content. The energy value of the pellets increases. The higher heating value of torrefied coffee ground pellets reached 26 MJ kg−1. The ash content also increases with these values. A simple energy balance has been carried out. Therefore, the study shows an insight into the energy use of coffee grounds and chaff from the garden compared to the results of the rapeseed straw pellets for the pelletization and torrefication process.Web of Science21035434

Characterization and flowability methods for metal powders

With the rise of additive technologies, the characterization of metal powders is increasingly required. There is a need to precisely match the properties of metal powders to a specific machine and to ensure highly consistent production. Therefore, the study aims at a detailed characterization of ten metal powders (Metal powder 316 L, Zn, Sn, Al, Cu, Mn, Fe, Bronze, Ti and Mo powder), for which the particle size distribution, morphology, static and dynamic angle of repose and the effective internal friction angle (AIFE) were determined. The AIFE parameter and flow index were determined from three commonly used rotary shear devices: The computer-controlled Ring Shear Tester RST-01. pc, the Brookfield PFT Powder Flow Tester and the FT4 Powder rheometer. The results showed that the values for the device of one manufacturer did not fully correspond to the values of another one. The flow characteristics of the metal powders were quantified from the particle size distribution data, static angle of repose, and AIFE data. According to the particle size distribution and angle of repose (AOR), 50% of the tested metal powders fell into the free-flowing mode. According to the evaluation of AIFE, 20% of the samples fell into the lower area. Based on the flow indexes calculated from the measurements of the shear devices used, 100% (RST-01.pc), 70% (PFT) and 50% (FT4) of the samples were included in the free-flowing category. When comparing the results, attention should be paid not only to the nature of the material, but also to the methodology and equipment used. A comparison of methodologies revealed similarities in the changing behavior of the different metal powders. A comparison of effective angles of AIFE and static AOR was shown, and a hypothesis of the conversion relation was derived.Web of Science101art. no. 2100

Analiza procesu oddzielania ziarna jęczmienia od zanieczyszczeń

DOI nefunkční (14.10.2019)The article focuses on the intensification of raw barley grains initial purification and separation processes before the subsequent processing in the area of brewing. Above all, it deals with the physical and mechanical concepts of the purification and separation of qualitatively satisfactory grains from undesirable impurities, e.g. coarse impurities, as the prevention from the potential damage of milling and scrapping facilities. Four different cultivated barley species were tested within the study. Physical and mechanical parameters were determined in all samples, for instance powder density, angle of internal friction and external friction angle with steel contact material, particle size distribution and morphology. The first results of measuring revealed the difference in the quality of initial entering component of barley grains before the purification process compared to the output quality of grains after machine purification and separation processes in the facilities determined for the subsequent grain storage. As a result of the non-effective process of separation, the final quality of the product, i.e. the beer, may be affected by the qualitative parameters of partial processes involved in treating barley grains.Artykuł koncentruje się na intensyfikacji wstępnych procesów oczyszczania i separacji surowych ziaren jęczmienia przed dalszym przetwarzaniem w procesie warzenia piwa. Przede wszystkim zajmuje się fizycznymi i mechanicznymi koncepcjami oczyszczania i oddzielania jakościowo zadowalających ziaren od niepożądanych zanieczyszczeń, np. gruboziarniste zanieczyszczenia, zapobiegające potencjalnym uszkodzeniom urządzeń do mielenia oddzielania zanieczyszczeń. W ramach badań przetestowano cztery różne gatunki jęczmienia. We wszystkich próbkach określono parametry fizyczne i mechaniczne, na przykład gęstość proszku, kąt tarcia wewnętrznego i kąt tarcia zewnętrznego ze stalowym materiałem kontaktowym, rozkład wielkości cząstek i ich morfologię. Pierwsze wyniki pomiarów ujawniły różnicę w jakości ziaren jęczmienia przed procesem oczyszczania w porównaniu z jakością wyjściową ziaren po oczyszczeniu. W wyniku nieefektywnego procesu separacji na jakość końcową produktu (piwo) mogą wpływać parametry jakościowe kolejnych procesów związanych z obróbką ziaren jęczmienia.Web of Science117617