Mahbub, Fazle and Hawlader, Mohammad Nurul Alam and Mujumdar, A. S.
(2009)
Combined water and power plant (CWPP) — a novel desalination technology.
Desalination and Water Treatment, 5.
pp. 172-177.
ISSN 1944-3994 (O), 1944-3986 (P)
Abstract
In recent years, an enormous increase of fuel cost and greater demand for fresh water have imposed
tremendous challenges for researchers to pursue a drive towards more energy-efficient desalination
technology. In the search for a more energy-efficient desalination process, the next generation plants
will use a combination of membrane processes with multi-stage flash (MSF)/multi-effect distillation
(MED) thermal processes to harness the maximum thermal energy that would otherwise be wasted
from a power plant. The novelty of this proposed combined water and power plant (CWPP) concept
lies in the usage of the power plant at rated conditions most of the time, where the power plant is
most efficient, and when demand falls in one area (electricity), resources can be directed to another
area (i.e. desalination). A detail thermoeconomic analysis of the proposed plant under different loads
has been used to quantify the benefits of the CWPP. This study includes a combined cycle (CC)
power plant with stand-alone MSF, MED and RO; and CC with MSF-RO hybrid or MED-RO hybrid.
The CWPP exhibits thermal efficiency of around 63% compared to conventional 44%. The specific
energy consumption can be reduced by about 17% with the proposed CC+MED+RO system
compared to CC+MSF+RO plants. Moreover, water can be produced from a MED/RO hybrid power
plant at about US$1.09/m3 whereas for MSF/RO, the cost increases to about US$1.65/m3 at a fuel
cost of 100 US$/barrel.
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