A kinetic description of alkali transformations in coal combustion systems

Conference · Sun Jan 01 04:00:00 EST 1989 · Preprints of Papers, American Chemical Society, Division of Fuel Chemistry; (USA)

OSTI ID:5142468

Srinivasachar, S; Helble, J J; Ham, D O; Domazetis, G ^[1]

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1. PSI Technology Co., Andover, MA (USA)

A kinetic model was developed to predict concentrations of atomic and molecular sodium species existing in both flame and post-flame zones of pulverized coal combustors. To date, the model has successfully predicted measured literature values of sodium species in the Na/H{sub 2}/O{sub 2}/N{sub 2} system. At all but the earliest conditions (< 1 ms) sodium hydroxide is predicted to be the dominant species. Atomic sodium levels decay rapidly, representing less than 1% of the total sodium species present at times greater than 5 milliseconds for lean hydrogen flames (H{sub 2}/O{sub 2} = 0.6, temperature = 1650{degree}C). Incorporation of sulfur chemistry into the model did not change this conclusion, as sodium hydroxide was still found to dominate. Further development, however, awaits determination as to whether alkali sulfation occurs in the vapor or the condensed phase, as well as the correct corresponding kinetics. Efforts in these areas are discussed.

• OSTI ID: 5142468
• Report Number(s): CONF-8904164--
• Conference Information: Journal Name: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry; (USA) Journal Volume: 34:2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
&amp; Peat-- Properties &amp; Composition
014000* -- Coal
Lignite
&amp; Peat-- Combustion
ALKALI METALS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
ELEMENTS
EQUATIONS
EXPERIMENTAL DATA
FLAMES
INFORMATION
KINETICS
MATHEMATICAL MODELS
METALS
NONMETALS
NUMERICAL DATA
PREDICTION EQUATIONS
QUANTITY RATIO
REACTION KINETICS
SODIUM
SULFUR
VERY HIGH TEMPERATURE