Integrated thermal cycle models, which have been developed for the simulation of dual-purpose power/desalination plants, are described. The models are used to determine net station heat rates and energy requirements for the desalination plant with MSF (multistage flash), LTMED (low-temperature multi-effect distillation) and RO (reverse osmosis) as the process options. A financial model is used to establish the cost economics of the integrated plant and to determine power and water costs based on a classical method of cost allocation in dual-purpose facilities. Costs will vary from project to project depending on the choise of the basic combined cycle, the power to water ratio, the cost of fuel, the plant capacity factor, the financing conditions, and other parameters. The following important conclusions can be drawn: Because of the excellent investment climate for power/desalination projects in the Middle East independent power producers contemplating such projects on a BOOT (build, own, operate and transfer) basis can expect attractive rates of return on their investments. The cost of desalinated water from dual-purpose plants is not as high as has been traditionally derived on the basis of commercial rates for power, which presents a 'price' rather than an internal cost. Even for a non-Middle East location, by adopting an approach similar to this study, with the energy cost based on the time-weight average avoided cost of power for a co-generation facility, low water water costs were obtained for a dual-purpose power/desalination plant. When seen from the perspective of a dual-purpose plant, the difference in water costs from the major desalination process is not that high. For instance, if the cost of power were set to fully subsidize the cost the cost of water, the power cost in the present study would be 0.0345 USD/kWh with MSF, 0.0326 USD/kWh with LTMED and 0.032 USD/kWh with RO.
Thermal cycle and financial modeling for the optimization of dual-purpose power-cum-desalination plants
Ein Modell für den thermischen Kreislauf und die Finanzierung der Optimierung von kombinierten Kraftwerk-/Entsalzungsanlagen
Desalination ; 109 , 1 ; 1-13
1997
13 Seiten, 5 Bilder, 5 Tabellen, 4 Quellen
Article (Journal)
English
Optimization of dual-purpose steam power and MSF desalination plant
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