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The power station at Al Kamil has three generating units. Each unit incorporates a gas turbine and an electrical generator. The turbine is coupled to the generator and both machines rotate at 3,000 revolutions per minute (or 50 Hz). The gas turbine has three main parts.
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A compressor to pressurize the air. |
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A combustion chamber where fuel is mixed with the air and burnt. |
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A power turbine rotated by the hot combustion gases expanding through it. |
Twenty-seven tonnes of air is drawn through large air filters each minute and then into the gas turbine compressor. This compresses the air from atmospheric pressure to 12 bar before flowing into the combustion chamber. Natural gas is mixed with the air and this is burnt creating a mixture of gases that is very hot and at high pressure. From the combustion chamber the gases expand through power turbine and rotate the turbine shaft.
The power turbine shaft is connected to the compressor and the generator. Two thirds of the power produced by the power turbine is used to compress the air in the compressor. The remaining 1/3 is used to drive the electrical generator. The generator produces approximately 95 megawatts of electricity. This electricity is produced at 15,000 volts, which is then transformed from 15,000 volts to 132,000 volts by the generator step up transformers. The electricity is supplied to the Oman’s 132 kV electricity grid.
The gas turbine uses demineralised water to cool the lubricating oil in the bearings and the air in the electrical generator. This water is contained in a closed circuit and cooled in the fin fan coolers.
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