Cogeneration steam power desalting plants using steam turbines

This paper presents the reasons and merits of using cogeneration generation power desalting plants (CPDP), the different methods used to rate their performance, and their drawbacks. The ratings of the CPDP are crucial, because the fuel cost allocation between the water and power depends on the rating method used. The ratings are usually based on the first and the second laws of thermodynamics. A reference CPCP plant using back-pressure steam turbine connected to desalting units is presented as an example to which the rating methods are applied. Energy and availability balances are given for the plant as well as its main characteristics.

Keywords: cogeneration, energy, exergy, steam power desalting plant, steam turbines, first law, second law, thermodynamics, exergy, seawater desalination