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Chapter 6 Conclusion The results show that it is both possible and profitable to implement an ORC in the boiler station. There are many possible ways to integrate the system into the station, however it is best to connect the evaporator of the ORC to the hot water circuit (HWC) of boiler C and its condenser to a point after the flue gas condenser belonging to boiler C. The most profitable power rating is found to be 400kW, in terms of maximizing NPV, and 300 kW, in terms of maximising the internal rate of return, at the current electricity price. For higher electricity prices, or lower maintenance costs, slightly larger systems are found to be profitable. In order to maximize the profitability of the investment, operate the plant in such a way to maximize the available thermal heat to the ORC as well as the cooling flow rate passing through the condenser of the ORC. To do this, shift as much of the heat production as possible from boiler A and boiler B to boiler C. Also, maximize the cooling flow rate to the ORC condenser by minimizing the mass flow rate to the heat exchanger of boiler A and B. Furthermore, if the aim is to maximize the electricity production, the results show that the electricity production starts to decrease for power ratings exceeding 1000kW. This is due to the limited cooling flow rate to the condenser and the part-load operation characteristics of the ORC systems. Therefore, it is never wise, not in any sense, to purchase a machine larger than 1000kW. 86PDF Image | Analysis of Organic Rankine Cycles for a Boiler Station
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