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An Integrated Solar Combined Cycle (ISCC) is a hybrid technology in which a solar thermal field is integrated within a combined cycle plant. In ISCC plants, solar energy is used as an auxiliary heat supply, supporting the steam cycle, which results in increased generation capacity or a reduction of fossil fuel use.
The Harry Allen Generating Station is a 628-megawatt (842,000 hp) natural gas fired combined cycle power plant located in Clark County, Nevada about 30 mi (48 km) north of Las Vegas. Electricity is generated by two GE Frame 7EA combustion turbines, two GE Frame 7FA+e combustion turbines, and a D11 steam turbine.
Another variant is the wood gasifier CHP plant whereby a wood pellet or wood chip biofuel is gasified in a zero oxygen high temperature environment; the resulting gas is then used to power the gas engine. Combined cycle power plants adapted for CHP; Molten-carbonate fuel cells and solid oxide fuel cells have a hot exhaust, very suitable for ...
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The efficiency of a conventional steam–electric power plant, defined as energy produced by the plant divided by the heating value of the fuel consumed by it, is typically 33 to 48%, limited as all heat engines are by the laws of thermodynamics (See: Carnot cycle). The rest of the energy must leave the plant in the form of heat.
Metallurgical developments have allowed steam-only plants to increase in efficiency over time, making the mercury vapour turbine obsolete. Modern combined cycle power plant generating stations operate at 61% efficiency, and with none of the safety issues inherent to a binary mercury Rankine cycle steam power plant.
FPL expects the $476 million [9] solar plant to reduce the combined-cycle power plant's natural gas consumption by 1.3 billion cubic feet (37 million m³) per year. [9] Over the 30-year life of the project, this is expected to save $178 million in fuel cost [10] and reduce carbon emissions by 2.75 million tons. [9]
Combined cycle power uses the heat from the gas turbine to make steam from the water to turn a steam turbine, instead of that heat getting exhausted out and wasted. Engine efficiency for combined cycle can achieve 60% compared to diesel motors' 45% efficiency. [2] [3]