Sulfur release dynamics for fluidized-bed combustion of Ohio coals

Technical Report · Fri Mar 01 04:00:00 EST 1991

OSTI ID:6781820

Sulfur and carbon transformation rates from coal volatiles and chars have been evaluated for six high-volatile bituminous Ohio coals. Experiments were conducted in a 5 cm (2 inch) ID fixed-bed flow reactor at three different bed temperatures, three pressures, four particle sizes, two oxygen concentrations, two gas velocities, and with three bed materials. As anticipated, the observed conversion rates generally increased with increasing temperature, increasing oxygen concentration, and decreasing particle size. Unexpectedly, these rates also increased with decreasing pressure. Within the temperature range of this investigation (1425 to 1725[degrees]F), char-C reaction rates appeared to be relatively independent of the coal seam. In contrast, char-S rates varied widely among these coals, reflecting their different coal-bound sulfur constituents. Devolatilization and char conversion rates were characterized by single-step, zero and first order reactions, respectively. Calculated intrinsic chemical rate parameters, including activation energy and pre-exponential factor, for both sulfur and carbon reactions are reported in the Arrhenius form. Use of this information in the design and operation of fluidized bed combustors can ultimately maximize sulfur capture and improve sorbent utilization, thereby, expanding the consumption and marketability of Ohio coals.

• Research Organization: Babcock and Wilcox Co., Alliance, OH (United States). Research and Development Div.; Ohio Coal Development Office, Columbus, OH (United States)
• Sponsoring Organization: EPRI; STOFOH; BABWIL; Electric Power Research Inst., Palo Alto, CA (United States); Ohio State Government, Columbus, OH (United States); Babcock and Wilcox Co., New Orleans, LA (United States)
• OSTI ID: 6781820
• Report Number(s): OCDO-93006030; ON: TI93006030
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
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& Peat-- Combustion
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ACTIVATION ENERGY
AIR POLLUTION CONTROL
ARRHENIUS EQUATION
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMPARATIVE EVALUATIONS
CONTROL
DEVELOPED COUNTRIES
DEVOLATILIZATION
ENERGY
ENERGY SOURCES
EQUATIONS
EVALUATION
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
KINETICS
MATERIALS
NORTH AMERICA
OHIO
OXIDATION
PARAMETRIC ANALYSIS
PARTICLE SIZE
POLLUTION CONTROL
PRESSURE EFFECTS
PYROLYSIS PRODUCTS
REACTION KINETICS
RETENTION
SIZE
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
USA