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Torrevaldaliga Sud Power Station - Design, review and thermal dispersion analysis


Tirreno Power has requested Tractebel to analyze the modification proposed by the Civitavecchia Harbour regarding the modification of the sea water intake and discharge of the Torre Valdaliga SUD Tirreno Power CFPP (called “Darsena Energetica Grandi Masse”).

Tractabel Engineering (TE P&G) has invited their daughter company IMDC NV to provide assistance as specialized subcontractor for a hydraulic and thermal dispersion study. IMDC was requested to perform the following tasks:

  • Civil works technical review or a review of the functional aspects of the new water intake and discharge structures, in terms of constructability, selected materials, verification of the execution planning and a qualitative assessment of sedimentation and dredging issues, based on experience (no calculations)
  • Hydraulic review of the modified section of the cooling water circuit, taking in account fouling and waves. Head losses have been determined for the full circuit, assuming that the section between the modifications is unchanged.
  • Numerical modelling of the thermal dispersion and analysis of various scenarios. A data analysis and both near field (using CORMIX) and far field modelling (using Delft3D) have been performed. The model was calibrated using various type of measurements under realistic worst-case conditions.

To simulate the behaviour and recirculation of the Torrevaldaliga Sud thermal plume, a 3D hydrodynamic model has been developed using the Delft3D software. To attain high precision in the area of interest, domain decomposition was applied. Due to the small tidal variations wind was assumed to have a dominant effect on flow velocity and direction. A time-varying wind has therefore been taken into account.

The model was calibrated based on a series of  typical atmospheric conditions. The measured plume dispersion was in good agreement with the available measurements.

Based on the outcome of the three study parts short comings of the design have been identified and recommendations have been made to the client regarding the design of the intake and outfall system.

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