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Another case88 illustrating application of the 2, GT and 1, ST module is Alstom’s contract for Sohar Aluminum Company for the turn key construction of a 1000 MW gas-fired combined cycle power plant in Oman. The power plant, which will supply electricity to power a new aluminum smelter, will include four 13E2s, four heat recovery steam generators, two steam turbines, six generators. The size of the modules then provides the option for Sohar to add an additional 500 MW of capacity in the future (two GT13E2 gas turbines, two heat recovery steam generators, steam turbine and three generators). Gas turbine (GT) or combined-cycle (CC) construction cost per kilowatt cost does not increase much for smaller turbines. With steam turbines, it would to a far greater extent, because of the high additional construction work that comes with a steam turbine plant. A CC unit can typically be installed in two to three years, and a steam plant often takes four to five years, with no incremental power available until the complete plant is commissioned. An application case that illustrates the availability of power in increments is Alstom’s recent project award99 from Australian energy company Alinta Ltd, to supply 2, 172 MW GT13E2 gas turbines for the first stage of a major cogeneration facility at Alcoa’s Wagerup alumina refinery in Australia. That power plant will also provide reserve capacity to the new wholesale electricity market in the state of Western Australia. The Alstom turbines will operate initially in open cycle (Wagerup Stage 1). At a later stage, (Wagerup Stage 2), the turbines will be part of a cogeneration plant, operating as a base load power station providing both steam and electricity. A project1010database (developed by Siemens KWU) was used to analyze all combined, open cycle and steam power plants globally with respect to capacity (MW), fuel requirements, power system frequency and regional location. The database lists projected orders through 2005. Specific areas of the analysis are summarized as follows: In terms of overall plant size, 300-600 MW combined cycle plants are the most favored plant size in both 50 and 60 Hz markets (Figure 75). A combination of more than one block improves economics, and 300-600 MW fits well with the demand curve of most power grids in well developed countries. Financiers are also familiar with these economies of scale. Fig. 74. The 395 MW Combined-Cycle Power Plant Otahuhu, New Zealand uses the modular concept Source: Siemens Westinghouse Countries with large grids and high power demand growth prefer combined cycle plants in the range 600 to 2,500 MW. For this combination 2 to 6 parallel units (single shaft or multi-shaft) will suffice. Power systems in countries with relatively small generating capacity, which require smaller capacity additions, need combined cycle power plants in the range 100 to 300 MW. A large gas 8 Alstom Power Press Release 14 Dec 2005 9 Alstom Power Press Release 9 Dec 2005 10 Tailor-made Off the Shelf: Reducing the Cost and Construction Time of Thermal Power Plants. Paul I., (Siemens Power), Karg J. (KWU), O’Leary, Sr. D, (World Bank) 61PDF Image | GAS TURBINES IN SIMPLE CYCLE COMBINED CYCLE APPLICATIONS
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