Properties of pressurized fluidized-bed combustion (PFBC) ashes

Technical Report · Fri Jan 01 04:00:00 EST 1993

OSTI ID:6543570

Yung, S -C ^[1]

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1. Calvert Environmental, Inc., San Diego, CA (United States)

Flow, electrical, and physical properties were measured for several PFBC ashes. The flow properties were determined for the Grimethorpe ash. The ash was free flowing at ambient temperatures. At 450[degree]C, the ash gained cohesive strength; but the gain was small and the ash can still be regarded as free flowing. At 870[degree]C, the ash formed a strong cake and can sustain a considerable stress. Therefore, there could be ash withdrawal problems if the ash hopper temperature is higher than 870[degree]C. If the hopper is at a lower temperature, such as 760[degree]C, a trouble free hopper can be designed. Resistivity was measured for ashes from Grimethorpe, Exxon, and Curtiss-Wright with a parallel plate test cell. The resistivity ranged from 10[sup 8] Ohm-cm to 10[sup 10] Ohm-cm at 450[degree]C and 10 bar pressure. It decreased to 5 [times] l0[sup 5] Ohm-cm to 5 [times] l0[sup 7] Ohm-cm at 900[degree]C and 10 bar pressure. Resistivity increased with pressure. The dielectric properties of Grimethorpe, Exxon, and Curtiss-Wright ashes were measured over the frequency range of 1 to 100 kHz, temperature 10 to 900[degree]C, and 1 to 10 bar pressure. The real part of the dielectric constant decreased with increasing frequency, but increased with increasing temperature. Gas pressure had a measurable but negligible effect.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (United States); Calvert Environmental, Inc., San Diego, CA (United States)
• Sponsoring Organization: EPRI; Electric Power Research Inst., Palo Alto, CA (United States)
• OSTI ID: 6543570
• Report Number(s): EPRI-TR-101209
• Country of Publication: United States
• Language: English

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ASHES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMBINED-CYCLE POWER PLANTS
COMBUSTION
COMBUSTION PRODUCTS
CONTAINERS
CORROSION
CRYSTAL STRUCTURE
DIELECTRIC PROPERTIES
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ELECTROSTATIC PRECIPITATORS
ENERGY SOURCES
EQUIPMENT
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FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
GRAIN SIZE
HOPPERS
LIFETIME
MACHINERY
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SIZE
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TURBOMACHINERY