Regeneration of lime for fluidized-bed combustion with carbon, with silica, and with coal ash. [6 refs]

Conference · Sat Jan 01 00:00:00 EST 1977

OSTI ID:7096807

Yang, R T; Steinberg, M; Shen, M S

Two basic processes for regeneration are currently under development. One is based on the reaction between CaSO/sub 4/ and carbon for the regeneration of CaO. Another is being designed for regeneration and recycling of the calcium silicates as sorbents, with lime and siliceous matters as the starting materials. The two basic processes can be ideally combined in a third system by utilizing the fly ash. Fly ash from the FB combustor contains significant amounts of carbon; about 5-40% from the ANL and the Exxon fluidized bed pilot combustors. By feeding fly ash and sulfated limestone to a kiln-type regenerator, calcium oxide and silicates are formed and are to be recycled to the combustor. Kinetics and other relevant studies such as particle strength for fluidization and chemical analyses of the products for the three processes are being undertaken in parallel. Process and cost analyses are being made. These include material and energy balances and cost analysis with special attention to the regenerative processes being developed. Kinetic models for sulfation and regeneration are being studied. Models for predicting the behavior of FBC from the bench-scale data are being examined. The results of this program to date are summarized.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: EY-76-C-02-0016
• OSTI ID: 7096807
• Report Number(s): BNL-22680; CONF-770447-2
• Resource Relation: Conference: Fluidized-bed combustion technology exchange workshop, Reston, VA, USA, 13 Apr 1977
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALCIUM OXIDES
PRODUCTION
REGENERATION
CALCIUM SILICATES
CALCIUM SULFATES
CHEMICAL REACTIONS
CARBON
FLUIDIZED-BED COMBUSTORS
ADSORBENTS
FLY ASH
CHEMICAL ANALYSIS
DESULFURIZATION
FLUE GAS
FLUIDIZED-BED COMBUSTION
FUEL GAS
PILOT PLANTS
SILICON OXIDES
USES
AEROSOL WASTES
ALKALINE EARTH METAL COMPOUNDS
BURNERS
CALCIUM COMPOUNDS
CHALCOGENIDES
COMBUSTION
COMBUSTORS
ELEMENTS
ENERGY SOURCES
FLUIDS
FUELS
FUNCTIONAL MODELS
GAS FUELS
GASEOUS WASTES
GASES
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SILICATES
SILICON COMPOUNDS
SULFATES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
WASTES
010500* - Coal
Lignite
& Peat- Products & By-Products
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry