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1.1 Aim In this thesis, the technical feasibility and economic profitability of implementing an ORC in the heat-only boiler plant S ̈avelundsverket, located in Alings ̊as, Sweden, is investigated. The research questions asked, in order to fulfil to aim of the thesis, are: • How, technically, can an Organic Rankine Cycle system best be implemented in S ̈avelunds- verket in order to maximize the profitability of the investment? • Howshouldtheplantbestbeoperatedinordertomaximizetheprofitabilityoftheinvestment? • What is the optimal system sizing, i.e. installed nominal power, which maximizes the profit- ability of the investment? 1.2 Scope The scope of the thesis comprises technical modeling and simulation of the boiler station with an Organic Rankine Cycle system integrated into the plant. The thermodynamic modeling of the boiler station and the ORC is done in a steady state manner, neglecting transient phenomena. Heat and pressure losses are also neglected due to their relatively small significance in this application. The results from the technical simulation is then used in a financial model to assess the profitability of the investment. The simulation of the model and financial investment analysis is performed for an economic default case scenario which most closely resembles the economic reality of today. The profitability at different electricity prices is also studied, since it is unlikely that the electricity price of the future will remain what it is today. Sensitivity analyses are also conducted in order to illustrate how changes, or uncertainty, in input parameters affect the valuation of the project as a whole. A few scenario analysis are performed in order to investigate the effects of different scenarios. 1.3 Structure and overview Chapter 1, Introduction, introduces the topic and provides a background to district heating systems, the electricity market of Sweden and the boiler station S ̈avelundsverket. Furthermore an overview of the ORC world market and some interesting ORC manufacturers is provided. Chapter 2, Theory, provides the fundamental thermodynamic theory necessary to understand the physics of the thesis, covering fundamental thermodynamic concepts such as entropy and enthalpy, in addition to thermodynamic power cycles. Flue gas condensation and heat exchanger theory, as 3PDF Image | Analysis of Organic Rankine Cycles for a Boiler Station
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