The advantages of the solids circulation fluid-bed boiler

Journal Article · Sun Jan 01 04:00:00 EST 1984 · Chem. Eng. Prog.; (United States)

OSTI ID:6691832

Cohen, W L; Johnson, W B; Parlee, M C

This article describes a second-generation recirculating fluidized bed combustor which has the ability to maintain a relatively constant superheat temperature and thermal efficiency as a function of turndown and fuel type. Advantages of the boiler include fuel flexibility, high sulfur capture, rapid and controlled load following capability, high carbon combustion efficiency, a simple coal and limestone feed system, minimal erosion, compact design, low NO/SUB x/ emissions, and enhanced heat transfer characteristics. The boiler has two major heat recovery zones: the riser/downcomer system and the convection section. Approximately 50% of the heat released in the bed is recovered as steam within the riser/downcomer system. Further heat recovery is achieved as flue gas and elutriated solids pass in external crossflow to the tube banks in the convection section. Heat transfer coefficients and temperature driving force in the convection section decrease due to the lower gas and solids flow rate. Coal, limestone and air are brought together and combusted in the dense-phase fluid bed which contains over 95% inert material (dense fused alumina pellets). Ash, calcium sulfate, calcium oxide, and unburnt carbon are the remaining bed constituents.

• Research Organization: Stone and Webster Engineering Corp., Boston, MA 02107
• OSTI ID: 6691832
• Journal Information: Chem. Eng. Prog.; (United States), Journal Name: Chem. Eng. Prog.; (United States); ISSN CEPRA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000 -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
421000* -- Engineering-- Combustion Systems
AIR
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ASHES
BOILERS
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBON
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
CONTROL
CONVECTION
DESIGN
DESULFURIZATION
EFFICIENCY
ELEMENTS
ENERGY RECOVERY
ENERGY SOURCES
ENERGY TRANSFER
EROSION
FLUE GAS
FLUIDIZED BED BOILERS
FLUIDS
FOSSIL FUELS
FUELS
GASEOUS WASTES
GASES
HEAT RECOVERY
HEAT TRANSFER
HEATING
LIMESTONE
MATERIALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RECOVERY
RESIDUES
ROCKS
SEDIMENTARY ROCKS
SOLIDS
SULFATES
SULFUR COMPOUNDS
SUPERHEATING
TEMPERATURE CONTROL
THERMAL EFFICIENCY
WASTES