Analysis and optimization of integrated gas turbine,heat recovery steam generator and multi-effect thermal vapour compression desalination plant

Abstract

The method and results of 4E (energy, exergy, economic and environmental) analysis and multi-objective optimization for a gas turbine, heat recovery steam generator and multi-effect thermal vapour compression desalination unit are investigated in this article. To optimize the system and to determine the optimal values of design parameters, the genetic algorithm was used. The first objective function was considered as the sum of investment and operational costs as well as penalty for producing ${\mathrm{NO}}_x$ emissions. The second objective function was the cycle total amount of exergy destruction. The optimal values of design parameters such as drum pressure of heat recovery steam generator, pinch point temperature in heat recovery steam generator, top brine temperature, last stage temperature, minimum temperature difference of condenser and number of effects were then estimated. Also, the effects of gas turbine part load as well as ambient temperature and fuel cost changes on the optimal values of design parameters were analysed.