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Hydrodynamic characteristics and coal-combustion modeling of a high velocity fluidized bed

Thesis/Dissertation ·
OSTI ID:5650629
In this study a bench scale loop fluidized bed (LFB) has been designed, fabricated and installed. The unit has been operated using sand, limestone, and gypsum particles. The latter two solids are chosen because of their presence in the coal combustion process for sulfur removal. Data have been collected to study the effect of particle size, particle density, air flux, and solid flux on fluidizing characteristics of the three solids. Extensive data have been obtained to study the effect of particle size, particle density, air flux, and solids flux on fluidizing characteristics of sand, limestone, and gypsum. It is found that solids flow behavior was sensitive to nozzle positions and air flow rates. Three dimensional plots have been prepared for predicting good operating regions for the LFB with respect to nozzle combination, air flow rate and riser solids fraction. Pressure drop data have been correlated with solids velocity and solids fraction to obtain a better solids friction factor equation than available in the literature. A computer program has been developed to predict the static pressure of every point in the LFB. The computer program predictions and the static pressure data show good agreement. Coal combustion and sulfur removal models for the LFB coal combustor have been developed. The predictions from these models agree with commercial data. A conceptual LFB coal combustor has been designed and the results have been compared with commercial coal combustion data. The LFB coal combustion process is found to provide better coal combustion and sulfur removal effectiveness than bubbling bed coal combustion with limestone injection processes.
Research Organization:
New Hampshire Univ., Durham (USA)
OSTI ID:
5650629
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
AIR FLOW
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
COMPUTERIZED SIMULATION
DESIGN
DESULFURIZATION
ENERGY SOURCES
FLOW MODELS
FLOW RATE
FLUID FLOW
FLUIDIZATION
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
GAS FLOW
GYPSUM
LIMESTONE
MATERIALS
MATHEMATICAL MODELS
MINERALS
NOZZLES
OXIDATION
OXYGEN COMPOUNDS
PARTICLE SIZE
POSITIONING
PRESSURE DROP
ROCKS
SAND
SEDIMENTARY ROCKS
SIMULATION
SIZE
SOLIDS FLOW
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES