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Publication Title | GAS TURBINES IN SIMPLE CYCLE COMBINED CYCLE APPLICATIONS

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GAS TURBINES IN SIMPLE CYCLE & COMBINED CYCLE APPLICATIONS*
Gas Turbines in Simple Cycle Mode Introduction
The gas turbine is the most versatile item of turbomachinery today. It can be used in several different modes in critical industries such as power generation, oil and gas, process plants, aviation, as well domestic and smaller related industries.
A gas turbine essentially brings together air that it compresses in its compressor module, and fuel, that are then ignited. Resulting gases are expanded through a turbine. That turbine’s shaft continues to rotate and drive the compressor which is on the same shaft, and operation continues. A separate starter unit is used to provide the first rotor motion, until the turbine’s rotation is up to design speed and can keep the entire unit running.
The compressor module, combustor module and turbine module connected by one or more shafts are collectively called the gas generator. The figures below (Figures 1 and 2) illustrate a typical gas generator in cutaway and schematic format.
Fig. 1. Rolls Royce RB211 Dry Low Emissions Gas Generator (Source: Process Plant Machinery, 2nd edition, Bloch & Soares, C. pub: Butterworth Heinemann, 1998)
* Condensed extracts from selected chapters of “Gas Turbines: A Handbook of Land, Sea and Air Applications” by Claire Soares, publisher Butterworth Heinemann, BH, (for release information see www.bh.com) Other references include Claire Soares’ other books for BH and McGraw Hill (see www.books.mcgraw-hill.com) and course notes from her courses on gas turbine systems. For any use of this material that involves profit or commercial use (including work by nonprofit organizations), prior written release will be required from the writer and publisher in question.
Please note that several topics in the gas turbine handbook, for instance Turbine Controls, Instrumentation and Diagnostics; as well as Performance Optimization and Environmental issues are not covered in this author’s material on this CD. The “Gas Turbines” book in question is several hundred pages long and besides the basics, covers some of the more complex and lengthy work in recent gas turbine development. Condensing it all here was not practical. What is here however, does give the reader the basic theory and practice of gas turbines in simple cycle and combined cycle mode, in power generation service.
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