|
|
Fossil fuels substitution in large combustion plant
Hájek, Zdeněk ; Popela, Pavel (referee) ; Touš, Michal (advisor)
The thesis aims at current issues of using renewable resources here in the Czech Republic, mainly on biomass co-firing with fossil fuels in large combustion plant. The introduction provides an overview of systems for biomass co-firing. Further the using of optimization for solution problem of integration biomass fuels into existing large combustion plants and planning its operation conditions is presented. The main point of this thesis lies in creating of a user interface for modeling and optimization tool. Its functionality will be proved by solving a case study involving the analysis of possibilities for replacing fossil fuels due to the limited availability of coal in the market.
|
|
|
Draft boilers for co-firing blast furnace gas and coke oven gas
Machara, Radek ; Křemínský, Pavel (referee) ; Baláš, Marek (advisor)
The diploma thesis deals with design of gas steam boiler with given parameters of steam. Blast furnace and coke oven gas are used as fuel. At the beginning of this work, both co-fired fuels are presented to us, their chemical analysis and stoichiometry are performed. The main part of the diploma thesis deals with the dimensioning of individual heat exchange surfaces such as steam superheaters, evaporators, economizers and air heaters. All heat exchange surfaces meet recommended parameters such as recommended steam rates, flue gas, etc. At the end, the total heat balance of the boiler is performed. Part of the work is also drawing documentation showing the main dimensions of the boiler. It is also indicated the connection of individual heat exchange surfaces.
|
|
|
Combustion of Solid Fuels in Rotary Kiln and Influence of their Composition on Emissions
Bojanovský, Jiří ; Jegla, Zdeněk (referee) ; Puchýř, Radim (referee) ; Máša, Vítězslav (advisor)
The work is focused on the study of the influence of solid fuel composition on the formation of pollutants during combustion in a rotary kiln. This is a highly topical issue related to the need to increase the share of alternative fuels as a substitute for fossil ones. The author builds on the research already carried out in this area, defines the basic characteristics of the problem under study and formulates hypotheses based on the summary of the current state of knowledge. The main hypothesis is ("The composition of the solid fuel mixture can be chosen in such a way as to reduce the generation of pollutants.") To verify this hypothesis, the author chooses experimental verification in combustion tests on a semi-operational experimental device. For the combustion tests, it was proposed to extend this equipment with apparatus that allows the evaluation of the fouling rate of heat transfer surfaces and the formation rate of particulate matter pollutants. This equipment was successfully used for combustion tests of 6 selected alternative fuels (refuse-derived fuel RDF, sewage sludge, and forest waste). Based on the combustion tests conducted with these sub-fuels, 6 fuel mixtures with high potential for industrial applications were defined. These mixtures were also burned in a rotary kiln. Based on the results obtained, the main hypothesis of the work was confirmed and the fuel mixture consisting of 70 wt.% forest waste, 20 wt.% RDF and 10 wt.% sewage sludge (MIX 6 in the work) was identified as the most suitable alternative to fossil fuels. This mixture did not show any operational problems and the best results were obtained in the formation of gaseous pollutants and particulate matter. The results of this work are a crucial point in the search for a methodology for the specification of suitable alternative fuel blends for combustion in the energy and manufacturing industries.
|
|
|
Draft boilers for co-firing blast furnace gas and coke oven gas
Machara, Radek ; Křemínský, Pavel (referee) ; Baláš, Marek (advisor)
The diploma thesis deals with design of gas steam boiler with given parameters of steam. Blast furnace and coke oven gas are used as fuel. At the beginning of this work, both co-fired fuels are presented to us, their chemical analysis and stoichiometry are performed. The main part of the diploma thesis deals with the dimensioning of individual heat exchange surfaces such as steam superheaters, evaporators, economizers and air heaters. All heat exchange surfaces meet recommended parameters such as recommended steam rates, flue gas, etc. At the end, the total heat balance of the boiler is performed. Part of the work is also drawing documentation showing the main dimensions of the boiler. It is also indicated the connection of individual heat exchange surfaces.
|
|
|
Fossil fuels substitution in large combustion plant
Hájek, Zdeněk ; Popela, Pavel (referee) ; Touš, Michal (advisor)
The thesis aims at current issues of using renewable resources here in the Czech Republic, mainly on biomass co-firing with fossil fuels in large combustion plant. The introduction provides an overview of systems for biomass co-firing. Further the using of optimization for solution problem of integration biomass fuels into existing large combustion plants and planning its operation conditions is presented. The main point of this thesis lies in creating of a user interface for modeling and optimization tool. Its functionality will be proved by solving a case study involving the analysis of possibilities for replacing fossil fuels due to the limited availability of coal in the market.
|
guest ::
