Abstract
This study aims to find a cost effective solution for converting an existing combined power plant into a CWP system including the membrane and thermal desalination units. Without applying major structural change in power plant, to supply fresh water, the steam lines extracted from heat recovery steam generator are used in the thermal desalination unit and membrane desalination system is connected to the gas turbine. An investigation is performed on the produced water and performance of power plant associated with different conditions of electricity and water demands. Also, the influence of steam corresponding to the low and high enthalpy conditions on the performance of thermal desalination unit and power plant is explored. Furthermore, in view of the production capacity of electricity associated with the gas units and consumption demands of various seasons, the influence of membrane desalination unit on the water production is illustrated. An economic investigation is performed to estimate the selling price of water in each unit. It is concluded that in the thermal unit, using HP line produces about 25,000 m3/day, while the LP line causes up to 7000 m3/day water.
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