Economic evaluation of different scenarios for gas turbine waste heat recovery to produce water and power

Abstract

ABSTRACTIn this study, economic analysis of different configurations of combined power and water systems is performed using DEEP software. Three different desalination systems including reverse osmosis (RO), multi-effect desalination (MED) and multi-stage flash (MSF) coupled to a gas turbine power plant with 2 × 165.1 MW capacity are considered and analysed. A specific capacity of 50,000 m3/day is assumed for all desalination systems. The results indicate that the RO system has the lowest simple payback time, while MED has the highest thermal utilisation. In terms of levelised cost of water, the RO system has the lowest amount with 1.03 $/(m3/day), while levelised cost of water for MED and MSF are equal to 1.47 and 1.93 $/(m3/day), respectively. Also sensitivity analysis showed that the fuel cost is the most effective parameter on the levelised cost of water. In general, it can be concluded that the RO system is the best choice in terms of economics.