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Analysssis of Mixtured Pellets Combustion
Somora, Jakub ; Milčák, Pavel (referee) ; Lisý, Martin (advisor)
The bachelor thesis focuses on combustion of mixed pellets compared to combustion of mixtu-re of monomaterial pellets. The research part deals with fuel properties of pellets as well as problems arising from the combustion process. It describes the major impact of sintering at biomass energy use, which is also related with the composition of fly ash. It also contains a comparison of the basic parameters of wood and alternative pellets, as well as the emission which are created in process of biomass combustion. The experimental part deals with the ana-lysis and comparison of combustion of mixed pellets as compared to the mixture of monoma-terial pellets. It includes monitoring of emission and solid pollutants content. At the end, the measured data are evaluated and compared to the current standards.
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Modification of inert atmosphere circuit of 3D printer SLM 280HL
Somora, Jakub ; Maňas, Pavel (referee) ; Koutný, Daniel (advisor)
The diploma thesis deals with the design modification of the circulation circuit of inert atmosphere in the 3D printer SLM 280HL. The aim of the proposed modifications was to increase the efficiency of condensate and flue gas removal and thus increase the quality of the production process. Based on experimental measurements of the velocity field at a height of 12 mm, it was found that in the original configuration of the build chamber, there are sites with reduced flow velocity. The test subsequently confirmed the increased porosity of the samples in the given localities. Subsequently, with the help of CFD simulations, a lower flow distributor was designed, which had the most significant effect on the porosity. Furthermore, an additional outlet and flow deflector were designed, which had the task of streamlining the drainage of condensate and fumes from under the protective glass of the laser. The designed components were manufactured and experimentally verified, which was able to prove the flow improvement and reduce the porosity on the platform. A test was also performed with a magnesium-based material, which proved more efficient removal of condensate and flue gases. The work managed to prove the influence of the flow velocity on the porosity of the component at differences in flow velocities above 0,3 ms^-1.
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Modification of inert atmosphere circuit of 3D printer SLM 280HL
Somora, Jakub ; Maňas, Pavel (referee) ; Koutný, Daniel (advisor)
The diploma thesis deals with the design modification of the circulation circuit of inert atmosphere in the 3D printer SLM 280HL. The aim of the proposed modifications was to increase the efficiency of condensate and flue gas removal and thus increase the quality of the production process. Based on experimental measurements of the velocity field at a height of 12 mm, it was found that in the original configuration of the build chamber, there are sites with reduced flow velocity. The test subsequently confirmed the increased porosity of the samples in the given localities. Subsequently, with the help of CFD simulations, a lower flow distributor was designed, which had the most significant effect on the porosity. Furthermore, an additional outlet and flow deflector were designed, which had the task of streamlining the drainage of condensate and fumes from under the protective glass of the laser. The designed components were manufactured and experimentally verified, which was able to prove the flow improvement and reduce the porosity on the platform. A test was also performed with a magnesium-based material, which proved more efficient removal of condensate and flue gases. The work managed to prove the influence of the flow velocity on the porosity of the component at differences in flow velocities above 0,3 ms^-1.
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Analysssis of Mixtured Pellets Combustion
Somora, Jakub ; Milčák, Pavel (referee) ; Lisý, Martin (advisor)
The bachelor thesis focuses on combustion of mixed pellets compared to combustion of mixtu-re of monomaterial pellets. The research part deals with fuel properties of pellets as well as problems arising from the combustion process. It describes the major impact of sintering at biomass energy use, which is also related with the composition of fly ash. It also contains a comparison of the basic parameters of wood and alternative pellets, as well as the emission which are created in process of biomass combustion. The experimental part deals with the ana-lysis and comparison of combustion of mixed pellets as compared to the mixture of monoma-terial pellets. It includes monitoring of emission and solid pollutants content. At the end, the measured data are evaluated and compared to the current standards.
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