Combustion turbine repowering of reheat steam power plants. Final report
The purpose of this project was to establish the technical and economic feasibility and the environmental impact of repowering a large, modern reheat fossil steam generator by adding a combustion turbine. Heat rate, added capacity, associated equipment modifications, costs, scheduling, and environmental impacts were evaluated. Several configurations--all retaining the steam generator--were studied. The main emphasis was on a 330-MW oil-fired boiler, but natural gas and coal were also considered. The results of this project indicate that the use of a combustion turbine to supply vitiated combustion air to the steam generator can increase capacity and reduce heat rate. Further, a wide variety of repowering configurations are possible, depending on which of many factors are of main interest. For example, repowered configurations can be identified that maximize heat rate improvement or added capacity, or that minimize down time, heat rejection, capital cost (based on either dollars per kilowatt or absolute dollars), or NO/sub x/ emissions. One typical repowering case yields the following results for the 330-MW oil-fired boiler: an 8240 Btu/kWh heat rate with combustion turbines supplying 23 percent of the plant output. This corresponds to a 32 percent increase in plant capacity and an 8 percent improvement in heat rate. NO/sub x/ emissions are projected to decrease 18 percent in this configuration. Incremental capital costs were placed at $250/kW. Major cost items include dismantling the air preheater, modifying the feedwater systems, and adding a low-temperature economizer and the combustion turbines. Other cases yielding even lower heat rates are covered in the evaluation. The main disadvantage of repowering is the increased use of clean petroleum fuels in the gas turbine. The availability of coal-derived gases and liquids could offset this disadvantage in the future.
- Research Organization:
- Westinghouse Electric Corp., Philadelphia, PA (USA). Combustion Turbine Systems Div.
- OSTI ID:
- 6677373
- Report Number(s):
- EPRI-FP-862
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMBINED-CYCLE POWER PLANTS
ECONOMICS
EFFICIENCY
ENVIRONMENTAL EFFECTS
FOSSIL-FUEL POWER PLANTS
RETROFITTING
AIR POLLUTION CONTROL
COMBUSTION
FEASIBILITY STUDIES
GAS TURBINES
USES
CHEMICAL REACTIONS
CONSTRUCTION
OXIDATION
POLLUTION CONTROL
POWER PLANTS
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
TURBINES
TURBOMACHINERY
200102* - Fossil-Fueled Power Plants- Power Cycles