Synergistic capture mechanisms for alkali and sulfur species from combustion

Technical Report · Fri Jan 10 04:00:00 EST 1992

DOI:https://doi.org/10.2172/5850231· OSTI ID:5850231

Peterson, T W; Shadman, F; Wendt, J O.L.; Mwabe, P O

The research described here is directed towards an investigation of mechanisms governing the capture of alkali metals and SO{sub 2} by injection of clay based sorbents into a combustor environment. While the species of interest are products of coal combustion, the earlier parts of these investigations will use a gas flame doped with relevant levels of Potassium, Sodium and Sulfur dioxide typical of a coal flame environment. This ensures that the particles so sampled from the combustor are from the injected sorbents and not mixed with coal ash. The approach here is to translate results from bench scale studies into evaluating governing mechanisms at a practical combustor level scale in which there exist both temperature variations and flow mixing characteristics. The research will thus consist of two tasks: (1) Detailed experimental studies for Alkali metals K, Na and toxic metal Cr in the presence of SO{sub 2} in which effect of parameters such as Speciation, Temperature profiles, Injection temperatures, residence time, bulk concentration levels, sorbent particle size and sorbent injection rates will be evaluated. (2) Theoretical modeling: Both equilibrium thermodynamics and reaction kinetics models will be used to correlate the experimental data. For these experiments the Sorbent type is Kaolinite (Al{sub 2}O{sub 3}2SiO{sub 2}3H{sub 2}O) which has been identified as most effective in alkali metal capture.

• Research Organization: Arizona Univ., Tucson, AZ (United States). Dept. of Chemical Engineering
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-90PC90285
• OSTI ID: 5850231
• Report Number(s): DOE/PC/90285-T1; ON: DE92008861
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
014000* -- Coal
Lignite
& Peat-- Combustion
ALKALI METALS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM
CLAYS
COMBUSTION
DOCUMENT TYPES
ELEMENTS
KAOLINITE
KINETICS
MATHEMATICAL MODELS
METALS
MINERALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
POTASSIUM
PROGRESS REPORT
REACTION KINETICS
REMOVAL
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SIZE
SODIUM
SORBENT INJECTION PROCESSES
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
THERMODYNAMICS
TRANSITION ELEMENTS