REACTIVITY AND COMBUSTION PROPERTIES OF COAL-DERIVED SOLID FUELS
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Title
REACTIVITY AND COMBUSTION PROPERTIES OF COAL-DERIVED SOLID FUELS
ICCI Project ID
88/2.2A-7
Investigator
Rostam-Abadi
Institution
Illinois State Geological Survey
ICCI Abstract
The objective of this research was to supply a broad range of combustion characterization data on coal-derived solid fuels. Three size fractions of an Illinois coal (IBC-101, VM=43.9%), three chars with volatile matter contents of 6, 12, and 15%, and a clean coal were studied.
Fuel analyses showed that removal of volati1e matter lowered sulfur emissions (lb SO /MMBtu) of the resulting chars. Chars appeared to be nonporous and had significantly lower Nâ‚‚-BET surface areas and slightly higher CO2 surface areas than the raw coal. Chars were also more difficult to grind than the coal.
Ignition temperatures of fuels increased with decreasing volatile matter. However, the dependance of ignition temperature on particle size was not strong. Burning profiles and reactivity data were obtained using a thermogravimetri c analyzer. The results showed that the smaller size fractions and higher volatile fuels were easier to burn. However, the 200x270 and 270x400 mesh size fractions burned similarly. Chars had seven times higher reactivity in steam than in CO2, Gasification reactions were much slower than the combustion reactiun.
Combustion efficiencies and ash deposition behaviors of fuels were
obtained in an entrained flow reactor under conditions representative of coal-fired boilers. Combustion efficiencies increased with increasing temperature, volatile matter and residence time and decreasing particle size. The effects of residence time and particle size were more pronounced for lower volatile fuels. Oxygen concentrations between 3 and 6% did not affect combustion efficiencies.
Ash deposition studies showed that clean coal produced a deposit that grew at a faster rate than the original coal. However, the deposit strength of the clean coal was less than that of coal. Deposits of the 6% char grew fastest and were the strongest deposits of the fuels tested.
Fuel analyses showed that removal of volati1e matter lowered sulfur emissions (lb SO /MMBtu) of the resulting chars. Chars appeared to be nonporous and had significantly lower Nâ‚‚-BET surface areas and slightly higher CO2 surface areas than the raw coal. Chars were also more difficult to grind than the coal.
Ignition temperatures of fuels increased with decreasing volatile matter. However, the dependance of ignition temperature on particle size was not strong. Burning profiles and reactivity data were obtained using a thermogravimetri c analyzer. The results showed that the smaller size fractions and higher volatile fuels were easier to burn. However, the 200x270 and 270x400 mesh size fractions burned similarly. Chars had seven times higher reactivity in steam than in CO2, Gasification reactions were much slower than the combustion reactiun.
Combustion efficiencies and ash deposition behaviors of fuels were
obtained in an entrained flow reactor under conditions representative of coal-fired boilers. Combustion efficiencies increased with increasing temperature, volatile matter and residence time and decreasing particle size. The effects of residence time and particle size were more pronounced for lower volatile fuels. Oxygen concentrations between 3 and 6% did not affect combustion efficiencies.
Ash deposition studies showed that clean coal produced a deposit that grew at a faster rate than the original coal. However, the deposit strength of the clean coal was less than that of coal. Deposits of the 6% char grew fastest and were the strongest deposits of the fuels tested.
Start Date
9/1/1988
End Date
8/31/1989
Year Funded
1988
Collection
Citation
“REACTIVITY AND COMBUSTION PROPERTIES OF COAL-DERIVED SOLID FUELS,” ICCI Reports, accessed May 23, 2024, https://isgswikis.web.illinois.edu/icci_reports/items/show/586.