Molten iron oxysulfide as a superior sulfur sorbent
Slagging combustors with injected lime or limestone are being considered as replacements for conventional coal burners. They have advantages in that they can be staged to reduce NO{sub x} and So{sub x} emissions. Iron oxide, as an alternative to lime or limestone may be effective not only as a desulfurizing agent, but under the right conditions of oxygen potential and after combination with sulfur, the reaction products of coal gases with iron oxide can act as a flux to produce a fluid phase. The thermodynamic conditions for optimum removal of sulfur from the first stage of a coal combustor are being determined by experiment and by use of existing data. Contour plots in which the pounds Of S0{sub 2} per million Btu of calorific power are plotted on isothermal ternary phase diagrams of the iron-oxygen-sulfur system. These contour plots determine the most favorable conditions for coal combustion in the presence of added iron oxide. Lowest S0{sub 2} pressures are close to the phase boundary limit between iron saturation and the oxysulfide liquid phase. Experimental studies in which ceramic containers (99% alumina) were used to contain the liquid were hampered by the tendency for the liquid to flow up and over the walls of containing vessels presumably as a result of surface tension effects. These effects, which make equilibration measurements difficult, may be favorable with respect to producing a high degree of reactivity of the oxysulfide with coal gases and resultant rapid reaction kinetics. As result of this problem, platinum containment vessels containers appear to avoid these surface tension effects. Thermodynamic and kinetic measurements are now being explored by thermogravimetric analysis.
- Research Organization:
- Minnesota Univ., Minneapolis, MN (United States). Dept. of Civil and Mineral Engineering
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-89PC89778
- OSTI ID:
- 7296816
- Report Number(s):
- DOE/PC/89778-T5; ON: DE92018320
- Country of Publication:
- United States
- Language:
- English
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Molten iron oxysulfide as a superior sulfur sorbent. Technical progress report, March 1, 1991--May 30, 1991
Molten iron oxysulfide as a superior sulfur sorbent
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SORPTIVE PROPERTIES
OXYSULFIDES
SULFUR DIOXIDE
AIR POLLUTION CONTROL
CALCIUM OXIDES
COAL GAS
COMBUSTORS
ISOTHERMS
LIMESTONE
PHASE STUDIES
PROGRESS REPORT
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMICS
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CARBONATE ROCKS
CHALCOGENIDES
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FLUIDS
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OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PYROLYSIS PRODUCTS
QUANTITATIVE CHEMICAL ANALYSIS
ROCKS
SEDIMENTARY ROCKS
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
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