The advanced PFB process: Pilot plant results and design studies
- Foster Wheeler Development Corp., Livingston, NJ (United States)
- Westinghouse Power Generation Business Group, Orlando, FL (United States)
- Gilbert/Commonwealth, Green Hills, PA (United States)
- Westinghouse Science and Technology Center, Pittsburgh, PA (United States)
- Institute of Gas Technology, Chicago IL (United States)
The plant being developed is a hybrid of two technologies; it incorporates the partial gasification of coal in a vessel called the carbonizer and the combustion of the resultant char residue in a circulating pressurized fluidized bed combustor (CPFBC). In this plant, coal is fed to a pressurized carbonizer that produces a low-Btu fuel gas and char. After passing through a cyclone and a ceramic barrier filter to remove gas-entrained particulates, the fuel gas is burned in a topping combustor to produce the energy required to drive a gas turbine. The gas turbine drives a generator and a compressor that feeds air to the carbonizer, a CPFBC, and a fluidized bed heat exchanger (FBHE). The carbonizer char is burned in the CPFBC with high excess air. The vitiated air from the CPFBC supports combustion of the fuel gas in the gas turbine topping combustor. Steam generated in a heat-recovery steam generator (HRSG) downstream of the gas turbine and in the FBHE associated with the CPFBC drives the steam turbine generator that furnishes the balance of electric power delivered by the plant. The low-Btu gas is produced in the carbonizer by pyrolysis/mild devolatilization of coal in a fluidized bed reactor. Because this unit operates at temperatures much lower than gasifiers currently under development, it also produces a char residue. Left untreated, the fuel gas will contain hydrogen sulfide and sulfur-containing tar/light oil vapors; therefore, lime-based sorbents are injected into the carbonizer to catalytically enhance tar cracking and to capture sulfur as calcium sulfide. Sulfur is captured in situ, and the raw fuel gas is fired hot. Thus the expensive, complex, fuel gas heat exchangers and the chemical or sulfur-capturing bed cleanup systems that are part of the coal gasification combined-cycle plants now being developed are eliminated.
- Research Organization:
- Foster Wheeler Development Corp., Livingston, NJ (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC21-86MC21023
- OSTI ID:
- 10104545
- Report Number(s):
- DOE/MC/21023-94/C0271; CONF-931094-1; ON: DE94002959; BR: AA1510050/AA3510100
- Resource Relation:
- Conference: 12. coal gasification power plants conference,San Francisco, CA (United States),27-29 Oct 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
COAL
CARBONIZATION
COMBUSTION
PYROLYSIS
LOW BTU GAS
GAS TURBINES
CHARS
CYCLONE SEPARATORS
FILTERS
CERAMICS
FLUIDIZED-BED COMBUSTORS
DESULFURIZATION
ADSORBENTS
PRESSURIZATION
WASTE HEAT BOILERS
STEAM GENERATION
COMBINED-CYCLE POWER PLANTS
ELECTRIC POWER
COST
CALCIUM HYDROXIDES
CALCIUM SULFIDES
SULFATION
200102
010409
014000
POWER CYCLES
PYROLYSIS AND CARBONIZATION