Turbine and superheater bypass evaluation. Final report. [Faster startup in cycling operation and less erosion with steam bypass systems, including bypass design]
Properly sized turbine and boiler bypass systems permit two-shift cycling operation of units, shorten start-up time, and reduce life expenditures of plant components. With bypasses installed, faster startups can reduce fuel costs by $100,000 per year for a typical 500-MW fossil-fired unit. This report discusses the technical characteristics of existing bypass systems and provides guidelines for sizing bypass systems to achieve economical and reliable two-shift operation. The collection and analysis of startup data from several generating units were used in conjunction with computer simulations to illustrate the effects of adding various arrangements and sizes of steam bypass systems. The report, which indicates that shutdown procedures have significant impact on subsequent startup and loading time, describes operating practices to optimize the effectiveness of bypass systems. To determine the effectiveness of large turbine bypass systems of less than 100% capacity in preventing boiler trips following load rejection, transient field data were compared to a load rejection simulation using the modular modeling system (MMS). The MMS was then used to predict system response to other levels of load rejection. 7 refs., 87 figs., 8 tabs.
- Research Organization:
- Power Dynamics, Havertown, PA (USA)
- OSTI ID:
- 5125167
- Report Number(s):
- EPRI-CS-4810; ON: TI87920032
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FOSSIL-FUEL POWER PLANTS
COMPUTERIZED SIMULATION
RECOMMENDATIONS
START-UP
STEAM TURBINES
THERMAL STRESSES
BOILERS
EROSION
FUEL ECONOMY
LOAD MANAGEMENT
PARTICULATES
SHUTDOWNS
SUPERHEATERS
MACHINERY
MANAGEMENT
PARTICLES
POWER PLANTS
SIMULATION
STRESSES
THERMAL POWER PLANTS
TURBINES
TURBOMACHINERY
200104* - Fossil-Fueled Power Plants- Components