Process performance of Ahlstrom Pyroflow PCFB pilot plant

Conference · Sat May 01 00:00:00 EDT 1993

OSTI ID:6596094

Sellakumar, K M ^[1]; Isaksson, J; Tiensuu, J ^[2]

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1. R D Center, Ahlstrom Pyropower, Inc., San Diego, CA (United States)
2. Ahlstroem Pyropower, Inc., Karhula (Finland). Hans Ahlstroem Lab.

Ahlstrom Pyropower has designed and built a 10 MW[sub th] (34 MMBtu) pressurized circulating fluidized bed (PCFB) pilot plant in Karhula, Finland. The unit is now operating. Data from this unit supports the design of a nominal 80 MW, Des Moines Energy Center 1 (DMEC-1) PCFB Repowering Project. The pilot plant PCFB combustor is of square cross-section. It is housed in a 3.6 m (11.8 ft) diameter pressure vessel. A high pressure high temperature gas cleaning unit downstream of the PCFB exhaust is installed in a separate 2.6 m (8.5 ft) diameter pressure vessel. The maximum plant operating pressure is 16 bar (232 psia). The fuel is fed in slurry form; sorbent is also fed along with the fuel. The net heat input per unit cross section of the combustor is the highest of any known combustion mode. The heat release can go up to 40 MW/m[sup 2] (12.6 MMBtu/ft[sup 2] hr). Many types of coals including high sulfur, bituminous Illinois No. 6 coal and Western sub bituminous, low sulfur Powder River Basin coal were tested. Combustion efficiencies in the range of 99.5 to 99.9% have been consistently observed. Emissions of various gases such as NO[sub x] SO[sub 2] and CO at different operating pressures and loads were monitored. The gas emissions have been lower than expected based on atmospheric circulating fluidized bed boiler experience. The sulfur retention is over 95 % with a Ca/S molar ratio of 1 to 2 for high sulfur Illinois No.6 coal. A GAVS molar ratio of 2.5 to 3.5 was observed to retain 95 % of sulfur with low sulfur Powder River Basin coal. All gaseous emissions during testing with Illinois No. 6 coal and Powder River Basin coal are well within the projected limits for the DMEC1 project. Emission data from tests with Illinois No. 6 coal and Powder River Basin coal are presented in the paper.

• Research Organization: Midwest Power, Des Moines, IA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FC21-91MC27364
• OSTI ID: 6596094
• Report Number(s): DOE/MC/27364-93/C0186; CONF-930521-7; ON: DE93011584
• Resource Relation: Conference: 12. international conference on fluidized-bed combustion, San Diego, CA (United States), 8-13 May 1993
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
COMPARATIVE EVALUATIONS
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
CIRCULATING SYSTEMS
PERFORMANCE TESTING
CARBON MONOXIDE
COMBUSTION PROPERTIES
DESIGN
EFFICIENCY
EMISSION
FUEL SLURRIES
NITROGEN OXIDES
PILOT PLANTS
PRESSURIZATION
SULFUR DIOXIDE
CARBON COMPOUNDS
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
COMBUSTORS
DISPERSIONS
ENERGY SOURCES
EVALUATION
FOSSIL FUELS
FUELS
FUNCTIONAL MODELS
MATERIALS
MIXTURES
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SLURRIES
SULFUR COMPOUNDS
SULFUR OXIDES
SUSPENSIONS
TESTING
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion