Integrated methods for production of clean char and its combustion properties

Technical Report · Tue Jan 01 00:00:00 EST 1991

DOI:https://doi.org/10.2172/5792127· OSTI ID:5792127

DeBarr, J A

The overall objective of this two-year program is to produce clean char using an integrated process scheme which combines physical coal cleaning, mild gasification and char oxydesulfurization. Low sulfur chars which could be used in utility boilers to meet 1995 emission standards of 2.5 lbs DO{sub 2}/MMBtu are produced from Illinois coals having emissions of >5 lbs SO{sub 2}/MMBtu. Mild gasification and low temperature oxidation studies for sulfur removal are conducted with selected coals from the Illinois Basin Coal (IBC) Sample Program in a batch fixed-bed reactor at the ISGS. Pound quantities of chars for combustion testing are prepared in a continuous rotary kiln reactor under optimized conditions of mild gasification and oxydesulfurization. Burning characteristics and ash deposition behaviors of desulfurized chars are determined to ensure that a useable fuel is produced. These tests are done at the University of North Dakota Energy and Environmental Research Center (UNDEERC) in a drop tube furnace (DTF), and at the US EPA in a 14 kW pilot-scale combustor. In some tests, methane is examined as an auxiliary fuel, and high-surface-area hydrated lime developed at ISGS is used to further reduce SO{sub 2} emissions. Complete analyses of the fuels are obtained to aid char desulfurization studies and help explain combustion and SO{sub 2} emission characteristics of the char. This project is a cooperative effort between the ISGS, UNDEERC and the US EPA and is cost-shared with US EPA and the US DOE through UNDEERC.

• Research Organization: Illinois State Geological Survey, Champaign, IL (United States)
• Sponsoring Organization: USDOE; ILDENR; USDOE, Washington, DC (United States); Illinois Dept. of Energy and Natural Resources, Springfield, IL (United States)
• DOE Contract Number: FG22-91PC91334
• OSTI ID: 5792127
• Report Number(s): DOE/PC/91334-T11; ON: DE92007881
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ASHES
DEPOSITION
BITUMINOUS COAL
CLEANING
COAL GASIFICATION
CHARS
COMBUSTION PROPERTIES
SULFUR DIOXIDE
EMISSION
CHEMICAL REACTORS
ILLINOIS BASIN
PACKED BEDS
PROGRESS REPORT
BLACK COAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
COMBUSTION PRODUCTS
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS PRODUCTS
RESIDUES
SULFUR COMPOUNDS
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification
010300 - Coal
Lignite
& Peat- Preparation- (1987-)
010402 - Coal
Lignite
& Peat- Purification & Upgrading
014000 - Coal
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& Peat- Combustion