In the literature, it is often proposed to combine two or more thermal cycles with in a power plant. In each case, the intention is to increase efficiency over a single cycle. Thermal processes can be combined in this way, whether the working medium is the same or different. However, the combination of cycles with different working media is more interesting because the advantages of each can complement each other. Typically, cycles are classified as “topping” cycles and” bottoming” cycles.
The heat released from the gas turbine is used to generate steam. Steam is generated. Other combinations are possible, such as the mercury vapor process or replacing water with organic fluids or ammonia. The mercury vapor process is no longer of interest today, as high efficiencies are achieved in conventional steam power plants.
Organic fluids and ammonia have advantages over water at low temperatures, such as lower volumetric flow rates and lack of wetting properties. However, their disadvantages, such as development costs and environmental impact, are significant enough to preclude their replacement by steam processes in combined cycle power plants. The discussion that follows concerns primarily open-cycle gas turbines and water/steam cycle combinations. Special applications using closed-cycle gas turbines are also briefly addressed.
About the Book
Combined Cycle Gas & Steam Turbine Power Plants, Third Edition provides a comprehensive overview of combined cycle power plants from thermodynamic, technical, and economic perspectives. This new edition provides readers with the latest technological developments and practical examples of existing state-of-the-art combined cycle power plants. This book is the definitive work on combined cycle power plants and will be of interest to practicing engineers as well as to engineering students.
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