Combined-cycle gas & steam turbine power plants by Rolf Kehlhofer
By Rolf Kehlhofer
With this 3rd version, overseas specialist Rolf Kehlhofer leads a crew of eminent engineers for the lengthy awaited replace of the "bible" for combined-cycle plants.
Combined-Cycle gasoline & Steam Turbine energy crops, third version, is a complete evaluate of the combined-cycle strength plant from a thermodynamic, technical, and monetary point of view. This re-creation supplies readers the newest technological advancements and functional examples from latest, cutting-edge combined-cycle crops. either practising engineers and engineering scholars will locate this ebook the definitive paintings on combined-cycle energy vegetation.
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The load factor results from the type of application the plant is intended for: base, intermediate or peak load operation, and the availability and reliability of the power station. Fuel costs per unit of electricity are proportional to the specific price of the fuel, and inversely proportional to the average electrical efficiency Economics 15 of the installation. This average electrical efficiency must not be mixed up with the electrical efficiency at rated load. It is defined as follows: fJ = 11 .
Only a few years ago, the efficiency of a newly installed coal-fired steam power plant was at these levels, but with much higher investment cost and complexity! Coal-fired power plants are competitive for base load application in places where cheap coal can be easily transported. Economics 21 Table 3-2 Net efficiency of various power plants Type of Plant Combined Cycle Power Plant Combined Cycle Power Plant Net Efficiency LHV (%) (800 MW) 55-59 (60MW) 50-54 Gas Turbine Plant (250 MW) 38-40 Gas Turbine Plant (60MW) 35-42 Steam Power Plant (coal) (800 MW) (42-) 47 Steam Power Plant (coal) (60MW) 30-35 Nuclear Power Plant (1250 MW) Biomass Power Plant (30 MW) 35 28-32 Based on LHV of the fuel at 150 ambient conditions and equipment new and clean Nuclear power plants have a low efficiency because the light water reactor technology used today allows the generation of steam only with low temperature and pressure.
This estimation shows that natural gas should still be available in the foreseeable future. Table 2-4 Fossil fuels: proved reserves vs. 2 x ton/a In today's mostly liberalized electricity market, the economics of a power plant are evaluated as any other industrial investment. Typically, an investor sets a target return on an investment; for instance, return on equity (ROE) or internal rate of return (IRR). Similarly to any other investment, this expected return depends on the risk profile of the project.