Engineering and economic evaluation of Ahlstrom Pyropower`s circulating pressurized fluidized-bed combustion power plant design. Final report

Technical Report · Wed Dec 01 04:00:00 EST 1993

OSTI ID:10108759

McKinsey, R R ^[1]; Green, C L ^[2]

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1. Bechtel Group, Inc., San Francisco, CA (United States)
2. Pyropower Corp., San Diego, CA (United States)

This study has developed consistent cost and performance data for three configurations of combined-cycle circulating pressurized fluidized-bed combustion (PFBC) power plant. Each design is based on technology offered by Ahlstrom Pyropower Inc. The gas turbines used are conventional machines protected from article erosion damage by a high temperature high pressure filter that removes virtually all the dust from the flue gas. Based on high sulfur coal with 90% retention, detailed power plant designs were prepared for nominal 100 and 370 MWe units. A preliminary design was also prepared for a nominal 160 MWe unit. For a subcritical steam cycle, the heat rates for the 80, 160 and 370 MWe units are 9255, 8989 and 8711 Btu/kWh, respectively. The corresponding total capital requirements are 1712, 1360 and $1129/kW in December 1992 dollars. Environmental performance is considered excellent. Circulating PFBC pilot plant results indicate that sorbent demand for a given sulfur retention is only slightly higher than for flue gas desulfurization. Sulfur retention of 90 percent can be achieved with a Ca/S molar ratio of 1.15 while 95 percent can be achieved with a ratio of 1.30. By injecting ammonia into the boiler NOx emissions can be reduced to below 0.05 lbs/MBtu. A novel feature of the study is the assessment of a temperature control unit (TCU) to counteract the effect of seasonal variations in ambient temperature. Compared to a PFBC plant without a TCU, the seasonal variations in heat rate and power output decreased from 7 to 4%, and from 15 to 8%, respectively.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (United States); Bechtel Group, Inc., San Francisco, CA (United States); Pyropower Corp., San Diego, CA (United States)
• Sponsoring Organization: Electric Power Research Inst., Palo Alto, CA (United States)
• OSTI ID: 10108759
• Report Number(s): EPRI-TR--103206; ON: UN94004423
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000
20 FOSSIL-FUELED POWER PLANTS
200102
CIRCULATING SYSTEMS
COAL
COMBINED-CYCLE POWER PLANTS
COMBUSTION
COMBUSTION PRODUCTS
ECONOMIC ANALYSIS
ECONOMICS
ENGINEERING
EPRI
FILTRATION
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
GAS TURBINES
HEAT RATE
LIMESTONE
POWER CYCLES
PRESSURIZATION