Cycling of high-pressure-steam power-generating units with drum boilers. Final report
In recent years, there has been an increased need to operate large fossil-fueled boilers in a cyclic mode. Such operation is unfortunately accompanied by a number of problems related to cyclic stresses, turndown limitations, energy losses, boiler-water quality, and control systems. Some success in dealing with these problems is being achieved through the use of variable-pressure operation, turbine bypasses, superheater bypasses, superheater division valves, firing-system modifications, and a number of miscellaneous design-modifications. Nevertheless, the need remains for further study of this topic. In the present study, the cyclic behavior of a boiler-turbine unit was investigated by both analytical and experimental methods. The main thrust of the study was the development of a new analytical model of transient boiler operation. This work was supplemented by a testing program at TVA's Widows Creek Station during which transient test-data was acquired on a cold start-up, a hot start-up, and a warm start-up. The development of the new analytical model included its formulation, implementation, validation, and documentation. The new analytical model is expected to be useful in many ways. It has already been used to identify critical boiler components during transient operation. In the future, the model can be used to determine the optimum operating procedures for boiler-turbine units engaged in cyclic duty and to develop design criteria for boilers intended for this service. The model can also serve as the basis for further model-development activities pertinent to both subcritical- and supercritical-pressure boilers.
- Research Organization:
- Tennessee Valley Authority, Chattanooga (USA). Div. of Energy Demonstrations and Technology; Combustion Engineering, Inc., Windsor, CT (USA); Mechanical Technology, Inc., Latham, NY (USA)
- OSTI ID:
- 5279771
- Report Number(s):
- EPRI-CS-2340; ON: DE82904050
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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BOILERS
THERMAL STRESSES
ENERGY DEMAND
DAILY VARIATIONS
FOSSIL-FUEL POWER PLANTS
LOAD MANAGEMENT
MATHEMATICAL MODELS
TURBINES
START-UP
TEMPERATURE GRADIENTS
DEMAND
MACHINERY
MANAGEMENT
POWER PLANTS
STRESSES
THERMAL POWER PLANTS
TURBOMACHINERY
VARIATIONS
200104* - Fossil-Fueled Power Plants- Components