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Usability of stillage from ethanol production
Audy, Dan ; Večeř, Marek (referee) ; Leštinský, Pavel (advisor)
This work solves the use of stillage from ethanol production. Also solves processing into material DDGS and then solves the material and energy balance. This material and energy balance was calculated for 7070 kg of stillage per hour. The final energy requirements of the process were based on the amount of stillage produced to obtain 1 m3 of ethanol. The results of this work offer an insight to the problems of processing stillage. Thanks to conversion for 1 m3 of produced ethanol, results is also offerring the possibility of fast conversion of an approximate energy needed for devices of other capacities.
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Does Czech Republic need a carbon tax?
Večeř, Marek ; Špecián, Petr (advisor) ; Máslo, Lukáš (referee)
This bachelor thesis deals with a concept of a carbon tax. It presents the theoretical working of the carbon tax, estimates of the tax rate, possible impacts on the economy and comparison to potential alternatives. In the empirical part of the thesis, there is, based on panel data, analyzed the effect of the size of the carbon tax rate on the amount of emissions of CO2 in selected OECD countries. Results of regression analysis indicate that every increase in the carbon tax rate by $1 per tonne of CO2 will be reflected in the decrease of emissions by 0.57 % in the given country. The thesis thus shows that carbon tax could be quite useful tool for reduction in the amount of emissions of CO2 and therefore a useful tool to reduce impacts of climate change.
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Usability of stillage from ethanol production
Audy, Dan ; Večeř, Marek (referee) ; Leštinský, Pavel (advisor)
This work solves the use of stillage from ethanol production. Also solves processing into material DDGS and then solves the material and energy balance. This material and energy balance was calculated for 7070 kg of stillage per hour. The final energy requirements of the process were based on the amount of stillage produced to obtain 1 m3 of ethanol. The results of this work offer an insight to the problems of processing stillage. Thanks to conversion for 1 m3 of produced ethanol, results is also offerring the possibility of fast conversion of an approximate energy needed for devices of other capacities.
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Studie chování stgoupajících bublin v různých kapalinách
Smutná, K. ; Wichterle, K. ; Večeř, Marek
Experimental work dealing with influence of liquid properties on behavior of medium-sized ellipsoidal bubbles (equivalent diameter 4 – 10 mm) is submitted in the contribution. The ellipsoidal bubble exhibits periodical motion with characteristic nonlinear trajectory. Contexture of the horizontal motion and the bubble wobbling is a course for characteristic bubble orientation throughout rising – bubble turns to ambient flow with the maximum crosssection.
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Oscilace tvarů stoupajících bublin
Wichterle, K. ; Smutná, K. ; Večeř, Marek
We have developed a mathematical model of this motion including two parameters: eccentricity of the ellipsoid and amplitude of the wobbling. Assuming statistically uniform rotation of the bubble, the model results probability density for all related quantities, i.e.: vertical and horizontal dimensions, equivalent ellipse axes, angle of inclination. By comparison of experimental data with the model predictions, parameters of the model have been evaluated. Evidently, gas bubble shape cannot be described by the common correlation suitable for drops.
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Povaha toku modelových suspenzí
Kulaviak, Lukáš ; Večeř, Marek ; Růžička, Marek ; Drahoš, Jiří ; Hladil, Jindřich
The main object of the present investigation is to test the settling abilities of mixtures of solid particles in liquids. The key quantity here is the magnitude of the viscosity, both of the carrying liquid (water-glycerol solutions) and the effective viscosity of the two-phase mixture. Few model systems were used (glass and polystyrene pellets), to study the settling process. The sedimentation were recorded by a video camera and the resulting deposit structure was photographed. Besides, also a real suspension was tested, of geological materials (calcite, quartz, mixed geological powder, etc.). Immersion rotary viscometer Brookfield with special spindles (RVT and V spindles) was used to measure the effective viscosity of the dispersion.
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Viskozitní charakteristiky geologických suspenzí
Kulaviak, Lukáš ; Večeř, Marek ; Růžička, Marek ; Drahoš, Jiří ; Hladil, Jindřich
The system under study was real geological suspension – ground sedimentary rocks of different chemical composition (calcite, quartz, etc.) dispersed in water-glycerol solutions. The reference one-phase system was a Newtonian liquid (glycerine with water). It is problematic to measure the rheology of settling suspensions, so some specific tools must be used. We used the rotating vane rheometry, with the immersion viscometer Brookfield and two spindles V-71 and V-72. The basic rheological data of solid-liquid system are displayed as flow and effective viscosity curves. The obtained results on rheology were related to the settling behaviour of the geological mixtures, namely to the certain kind of the lateral instability.
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