Integrated methods for production of clean char and its combustion properties. Interim final technical report, September 1, 1991--December 31, 1992
- Illinois State Geological Survey, Champaign, IL (United States)
- Environmental Protection Agency (United States)
- University of North Dakota (United States). Energy and Environmental Res., Center
An integrated method consisting of physical coal cleaning, mild gasification (MG) and low temperature oxidation (LTO) is proposed to produce chars with S0{sub 2} emissions at least 50% lower than those of their parent coals. MG and char desulfurization studies are conducted in both a batch fluidized-bed reactor (FBR) and in a continuous rotary tube kiln (RTK). Combustion properties and ash deposition behaviors of desulfurized chars are determined at the US EPA in a 14 kW pilot-scale combustor and at UNDEERC in a drop tube furnace (DTF). This project is cost-shared with the US EPA and the US DOE through UNDEERC. MG chars were prepared from l00 {times} 200 mesh size fractions of each of six coals selected from the Illinois Basin Coal (IBC) Sample Program in a FBR. under non-optimized conditions, desulfurized chars with S0{sub 2} emissions 60--71% lower than the parent coals were made, depending on the coal. Chars prepared from four of the six coals had SO{sub 2} emissions less than 2.5 lbs S0{sub 2}/MMBtu. Optimization of LTO conditions revealed that the greatest reduction in S0{sub 2} emissions was obtained using smaller particle diameters, steam during both MG and LTO, a higher temperature and higher oxygen partial pressure. Under optimized conditions, S0{sub 2} emissions of one of the coals were reduced nearly 67%, from 4.60 to 1.49 lbs S0{sub 2}/MMBtu. About 40 pounds of low-sulfur char were prepared from IBC-102 in the RTK. The amount of sulfur removed in the RTK was less than in the FBR, and gave a char with S0{sub 2} emissions of about 2.4 lbs S0{sub 2}/MMBtu. The greater sulfur removal in the FBR was attributed to a smaller mean particle diameter, better gas-solid contact and/or decreased partial pressure of S0{sub 2}.
- Research Organization:
- Illinois Dept. of Energy and Natural Resources, Springfield, IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Illinois Dept. of Energy and Natural Resources, Springfield, IL (United States)
- DOE Contract Number:
- FG22-91PC91334
- OSTI ID:
- 10117555
- Report Number(s):
- DOE/PC/91334-T107; ON: DE94005708; BR: AV0100000
- Resource Relation:
- Other Information: PBD: 1992
- Country of Publication:
- United States
- Language:
- English
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