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EFFECTIVE UTILIZATION OF MUNICIPAL SOLID WASTE IN HEAT AND POWER SYSTEMS
Putna, Ondřej ; Klemeš, Jiří (referee) ; Ucekaj, Vladimír (referee) ; Stehlík, Petr (advisor)
The dissertation thesis is focused on the issue of energy recovery of waste. It contributes to optimization models developed in the author's workplace in the long term, which serve to simulate material flows in waste management and to search for an optimal waste management strategy. The main objective is to assess the potential for the use of heat produced in waste-to-energy plants as a key factor for the economy of these facilities. The thesis therefore represents an activity on the border of the fields of waste management and heating. Partial mathematical models were developed within the scope, for which it was necessary to collect input data, especially in relation with district heating networks. These models were then used in a comprehensive optimization model describing the integration of waste-to-energy plants with other heat sources. This main model was extended to include the environmental aspect.
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Operational Research in Waste Management: Task Reduction Techniques
Janošťák, František ; Máša, Vítězslav (referee) ; Šenkeřík, Roman (referee) ; Pavlas, Martin (advisor)
The dissertation thesis focuses on reducing the computational complexity of selected modeling tasks in waste management. Two types of optimization tasks are presented here. First, attention is focuses on transport tasks. Current computational tools approach transport tasks with greatly simplified models of transportation costs. The thesis presents a more accurate model of transportation costs and describes its implementation into the long-term successfully used unique tool NERUDA. The improved tool provides more accurate results, however, requires more computational time. The work describes cases where the original tool provides results comparable to the improved one and suggests the methodology of how to identify, even before the calculation, whether the use of optimized models is necessary. The work continues in the area of scenario approaches, which output a significant amount of transport task results. Analysis of the results and their processing is key for further use in practice. The currently used tool works with future development scenarios where one result is calculated for each scenario. In many cases, the results are very similar, but their quantity hinders the following analysis The thesis describes an approach based on cluster analysis, which groups the results into categories and thereby significantly aids their processing and interpretation. The second type of tasks is represented by the optimization of the conceptual design of a waste-to-energy plant and a heating plant cooperation. In general, this is a stochastic mixed integer non-linear programming problem. The work presents an innovative approach, which, based on the decomposition of the task and its parallel solution, allows working with higher accuracy without a significant increase in computing time.
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EFFECTIVE UTILIZATION OF MUNICIPAL SOLID WASTE IN HEAT AND POWER SYSTEMS
Putna, Ondřej ; Klemeš, Jiří (referee) ; Ucekaj, Vladimír (referee) ; Stehlík, Petr (advisor)
The dissertation thesis is focused on the issue of energy recovery of waste. It contributes to optimization models developed in the author's workplace in the long term, which serve to simulate material flows in waste management and to search for an optimal waste management strategy. The main objective is to assess the potential for the use of heat produced in waste-to-energy plants as a key factor for the economy of these facilities. The thesis therefore represents an activity on the border of the fields of waste management and heating. Partial mathematical models were developed within the scope, for which it was necessary to collect input data, especially in relation with district heating networks. These models were then used in a comprehensive optimization model describing the integration of waste-to-energy plants with other heat sources. This main model was extended to include the environmental aspect.
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