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Hydraulic Model Study for AES Meghnaghat 450MW Combined Cycle Power Plant |
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Location |
Down stream of the Meghna Bridge at Meghna Ferryghat
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Type of Project |
Thermal plume and morphological modelling
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Period of Study |
August 2000 to May 2001
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Client |
Hyundai Engineering and Construction Co. Ltd. |
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Description
A 450 MW Combined Cycle Power Plant (CCPP) is under
construction on the right bank of the Meghna River near Meghna Bridge at
Meghna Ferryghat. The area is influenced by tidal action, which is
significant during the dry season. The CCPP would draw cool water from the
river and discharge the hot water into the river. Inappropriate location
of intake and outlet of water can create condition that would cause
tremendous loss of efficiency particularly in the dry season and also
endanger the aquatic life. The guidelines of the World Bank require that:
" the effluent should result in a temperature increase of no more
than 3 degrees Celsius at the edge of the Zone where initial mixing and
dilution takes place. Where the zone is not defined, use 100 metres from
the point of discharge when there are no sensitive aquatic ecosystems
within this distance." The hydraulic model study, which has been carried out
by DHI (Danish Hydraulic Institute)/(Surface Water Modelling Centre) SWMC,
aims at river hydraulics, advection-dispersion of heated water and
sediment transport, and scouring along the proposed location of the plant
using advanced mathematical tools, eg. MIKE 11, MIKE 21 and MIKE 3,
developed by Danish Hydraulic Institute (DHI). Following three scenarios
were investigated for the critical condition that may occur with respect
to re-circulation and absolute temperature of intake with the help of a
suite of one or more of the above models. |
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