Integrated methods for production of clean char and its combustion properties. Quarterly technical report, December 1, 1992--February 28, 1993
- Illinois State Geological Survey, Champaign, IL (United States)
- Illinois Dept. of Energy and Natural Resources, Springfield, IL (United States). Geological Survey
- Environmental Protection Agency, Cincinnati, OH (United States)
- North Dakota Univ., Grand Forks, ND (United States). Energy and Environmental Research Center
- Illinois Clean Coal Inst., Carterville, IL (United States)
An integrated method consisting of physical coal cleaning, mild gasification (MG) and low temperature oxidation (LTO) is proposed to produce chars with SO{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 kill 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. During the first year of this two year project, six coals from the IBC sample program (IBC-101, 102, 104, 105, 106 and 109) were studied. Under non-optimized conditions, desulfurized chars with SO{sub 2} emissions 60--71% lower than the parent coals were made in the FBR, depending on the coal. Chars prepared from four of the six coals had SO{sub 2} emissions less than 2.5 lbs SO{sub 2}/MMBtu. Under optimum conditions SO{sub 2} emissions of one of the coals were reduced nearly 67%, from 4.60 to 1.49 lbs SO{sub 2}/MMBtu. MG reduced the chlorine content of one coal 93%. During the reporting period, about 160 pounds of {minus}48 mesh IBC-102 coal were preoxidized in air at 150{degrees}C for 30 minutes in the RTK to minimize agglomeration during MG tests. MG of the preoxidized coal at 600{degrees}C produced about 75 pounds of char. About65 pounds of LTO char were prepared by oxidizing the MG char at 420,,C for about 10 minutes. The amount of sulfur removed in the RTK was less than in the FBR, and gave a char with SO{sub 2} emissions of about 2.4 lbs SO{sub 2}/MmBtu. The greater sulfur removal in the FBR was attributed to a smaller mean particle diameter, better gas-solid contact and/or a decreased partial pressure of SO{sub 2}.
- Research Organization:
- Illinois Dept. of Energy and Natural Resources, Springfield, IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC22-92PC92521
- OSTI ID:
- 10148974
- Report Number(s):
- DOE/PC/92521-T23; ON: DE93013642
- Resource Relation:
- Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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