By David Lindsley; Institution of Electrical Engineers
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Additional resources for Power-plant control and instrumentation : the control of boilers and HRSG systems
In essence, the three classes have the following characteristics. Class 1: An igniter providing sufficient energy to raise the temperature of the fuel and air mixture above the minimum ignition temperature, and to support combustion, under any burner light-off or operating conditions. Such igniters generally have a capacity of more than 10% of the full-load capacity of the main burner that it is igniting. This class is also referred to as a'Continuous Igniter'. Class 2: (also referred to as an 'intermittent igniter'): Capable of lighting the fuel only under a defined range of light-off conditions.
M. each morning, British generating companies who wish to trade during the following day submit bids on behalf of each of their plants, accompanied by information on the capacity available from each plant and its operational parameters. These bids are then ranked nationally in a form of a league table, with the cheapest generator at the top and the most expensive at the bottom. This table is termed the 'merit order' for all the generating units that are capable of being connected to the system.
6 Gas turbines in combined-cycle applications In the combined-cycle plant, the heat used for boiling the water and superheating the steam is obtained from the exhaust of a gas turbine, as described in Chapter 2. In such plant, unless supplementary firing is used, the combustion process occurs entirely in the gas turbine. Where supplementary firing is used the relevant control systems take on many of the characteristics of the oil- or gas-firing systems discussed earlier in the present chapter. 7 Summary So far, we have looked at the operation of the boiler and studied in outline the boiler's steam, water and gas circuits, and all the major items of plant required for their operation.