Final ESR - Part 2 - Eskom

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REVISED FINAL ENVIRONMENTAL SCOPING REPORT FOR THE PROPOSED COMBINED CYCLE GAS TURBINE (CCGT) POWER PLANT IN THE AMERSFOORT AREA, MPUMALANGA PROVINCE Figure 6.1 Showing a direct dry cooling system Indirect dry cooling systems have a condenser and turbine exhaust system as for wet systems, with the circulating water being passed through finned tubes in a natural draught cooling tower. The water pipework allows the towers to be sited away from the station. The indirect system also uses a cooling tower and water (see Figure 6.2). Heat is conducted from the water through the “A – frame” bundles of cooling elements arranged in concentric rings inside the tower. The cooling water flows through these elements, cools down as the cold air passes over them and returns to the condenser. This is referred to as a closed system as there is no loss of water due to evaporation. <strong>Eskom</strong> embarked on the direct and indirect dry cooling systems in its endeavour to conserve the county’s limited water supplies. Although the expense involved in the construction and operation of a dry cooling system is greater than a conventional wet cooling system, depending on availability water resources may influence any such in determining the choice between the two technologies. ALTERNATIVES 60 11/08/2008
REVISED FINAL ENVIRONMENTAL SCOPING REPORT FOR THE PROPOSED COMBINED CYCLE GAS TURBINE (CCGT) POWER PLANT IN THE AMERSFOORT AREA, MPUMALANGA PROVINCE Figure 6.2 Showing a typical indirect dry cooling system <strong>Eskom</strong> is currently investigating which dry-cooling system will be utilised at the proposed CCGT power plant. 6.5.2 Air Quality Abatement Technologies The CCGT is considered cleaner burning technology, although some emissions such as oxides of sulphur, oxides of nitrogen and greenhouse gases (e.g. carbon dioxide) may be emitted. The proposed CCGT power plant will have appropriate air quality abatement technologies to comply with relevant applicable air quality legislation. To this end, various air quality abatement technologies will be investigated as part of the EIA phase. 6.6 Pipeline Alternatives 6.6.1 Fuel Supply Pipeline Fuel supply will be provided in the form of a high quality burnable gas. The fuel pipeline transportation routes have not been determined at this stage, but will be identified, in the form of corridors, and addressed in the EIA phase of the project. 6.6.2 Water Supply Pipeline Water supply to the CCGT power plant will be via a pipeline from the quota allocated to the existing coal-fired Majuba Power Station. The exact length and route of the alignment of the proposed pipeline is not known at this stage although it is envisaged that this pipeline would not be more than 10 km in length. Some water may also be sourced from the Rietpoort ALTERNATIVES 61 11/08/2008 Key: CT: Cooling Tower T: Turbine P: Pump C: Condenser Tubes D: Dry-cooling elements G: Generator
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Final ESR - Part 2 - Eskom

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