Carbon combustion efficiency and sulfur dioxide emission in fluidized bed combustion of Texas lignite
This study is an effort to characterize the relationships between both the carbon efficiency and sulfur dioxide emission and the operating conditions of a pilot plant FBC (fluidized-bed combustion) unit. The design and instrumentation of the pilot plant FBC facility used in the experimental studies are described. The relevant operating parameters are identified and their influence on carbon efficiency and sulfur dioxide emission is determined experimentally. The effects of the operating parameters are then consolidated through use of the carbon residence time in the so-called emulsion-phase of the reactor as a single correlating parameter for the carbon efficiency. The variation in the sulfur retention by the lignite ash mineral matter with operating conditions is measured and the reduction in sulfur emission obtained with limestone sorbent addition is determined. The effects of staged combustion and recycle of the elutriated material are also studied. A model is developed to predict the carbon efficiency based on the residence time of the char in the bed. The char particle size distribution in the bed is calculated by use of a population balance assuming the rate of combustion to be controlled by diffusion of oxygen to the char particle surface. The predictions of the model show good agreement with the experimental pilot plant data.
- Research Organization:
- Texas Univ., Austin (USA)
- OSTI ID:
- 6168239
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010600 -- Coal
Lignite
& Peat-- Properties & Composition
010800 -- Coal
Lignite
& Peat-- Waste Management
014000* -- Coal
Lignite
& Peat-- Combustion
ADSORBENTS
ADSORPTION
AIR POLLUTION ABATEMENT
BROWN COAL
CARBON
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHALCOGENIDES
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION PROPERTIES
DATA
DIFFUSION
EFFICIENCY
ELEMENTS
EMISSION
ENERGY SOURCES
EQUATIONS
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
FUNCTIONAL MODELS
INFORMATION
KINETICS
LIGNITE
LIMESTONE
MATERIALS
MATHEMATICAL MODELS
NONMETALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARAMETRIC ANALYSIS
PARTICLE SIZE
PILOT PLANTS
POLLUTION ABATEMENT
PREDICTION EQUATIONS
PYROLYSIS PRODUCTS
REACTION KINETICS
RECYCLING
ROCKS
SEDIMENTARY ROCKS
SIZE
SORPTION
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE