CaO interactions in the staged combustion of coal. Sixth quarterly technical progress report, January 1-March 31, 1982

Technical Report · Mon May 10 04:00:00 EDT 1982

OSTI ID:5407511

Levy, A; Merryman, E L; Rising, B W

Efforts were directed primarily to the coal combustion studies. Pulverized coal treated with lime (Ca/S = 3.8) is being burned in a methane-coal (M-C) burner to determine the sulfur capture potential of the coal under various combustion conditions, e.g., temperature, residence time, and equivalence ratio. Data obtained under fuel-rich combustion conditions indicate that the sulfur retention potential of the coal is strongly dependent on residence time. Sulfur retention values obtained this quarter at residence times of 1/2 to 3/4 second ranged from 20 to 60%, the higher capture values generally occurring at equivalence ratios, phi, greater than 1.25. This is a noticeable drop from the more than 80% retention observed at residence times around 1/5 second and phi = 1.7 to 1.9. Analyses of the data indicate that temperature dependent sulfates are formed with possibly little or no sulfide formation in the samples analyzed. Sulfides, if formed, are apparently being oxidized to sulfate rapidly in the early postflame high temperature gas regions. The current results are suggesting that we analyze the methane-coal system more critically in terms of the methane and the coal-volatiles equivalence ratios. Data from the fuel-rich M-C firings to date show a strong correlation between sulfur retention and carbon burnout of the coal. The relationship is expressed by the equation: Sulfur retention = -0.87 x Carbon burnout + 93.7, where sulfur and carbon burnout are expressed as percent. The correlation coefficient for these data is 0.95. In essence, the data are suggesting that sulfur retention and carbon burnout are responding in similar ways to the three independent variables, temperature, residence time, and equivalence ratio.

• Research Organization: Battelle Columbus Labs., OH (USA)
• DOE Contract Number: AC22-80PC30301
• OSTI ID: 5407511
• Report Number(s): DOE/PC/30301-6; ON: DE82014402
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
03 NATURAL GAS
034000 -- Natural Gas-- Combustion
090110 -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
ADDITIVES
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
ALKANES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
CONTROL
CORRELATIONS
DATA
DISPERSIONS
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUEL-AIR RATIO
FUELS
HYDROCARBONS
INFORMATION
MATERIALS
METHANE
MIXTURES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
RETENTION
SULFUR
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE