Combustion and emissions characterization of pelletized coal fuels. Final technical report, September 1, 1992--August 31, 1993
- Southern Illinois Univ., Carbondale, IL (United States). Dept. of Mechanical Engineering and Energy Processes
The feasibility of converting waste preparation plant coal streams into marketable fuels with good combustion and emissions properties has been investigated in this project. Coal pellets containing both hydrated lime and limestone as sorbents were made from a flotation column waste feedstock under a related Illinois Clean Coal Institute project. These pellets, which contain sorbent with Ca/S ratio varying from 0.8 to 2.4 were successfully burnt in a 4-inch internal diameter circulating fluidized bed combustor. Emissions levels of sulfur dioxide, oxides of nitrogen and hydrogen chloride were measured as a function of bed temperature. Mineral matter analyses of the combustion generated ash was made, and combustion efficiencies were studied. The pellet coals combustion performance was compared to that of an Illinois No. 6 run-of-mine coal from the same preparation plant. Results show that the coal pellets, produced from the flotation column waste stream, are excellent fluidized bed combustor fuels. Calcium hydroxide impregnated pellets yielded lower sulfur dioxide emissions than limestone sorbent pellets for the same Ca/S ratio. Increase in Ca/S ratio with the hydrated lime sorbent produced a more rapid decline in sulfur dioxide emissions than with the limestone sorbent. Oxides of nitrogen emissions were generally on the order of 0.3 to 0.4 lbs/10{sup 6} Btu. Hydrogen chloride emissions were found to be influenced more by Ca/S ratios than by bed temperature, and varied in the range of 0.0075 to 0.055 lbs/10{sup 6} Btu in the present tests. Combustion efficiencies of the pellet fuels were about 98% without secondary cyclones recycle. EDX analysis of the mineral matter in the raw coal and the combustion-generated ash samples sheds light on the mineral transformations during combustion.
- 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:
- 10132196
- Report Number(s):
- DOE/PC/92521-T72; ON: DE94008014; TRN: 94:003531
- Resource Relation:
- Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
Similar Records
CFBC evaluation of fuels processed from Illinois coals. Final technical report, September 1, 1991--August 31, 1992
Preliminary assessment of alternative atmospheric fluidized-bed-combustion power-plant systems. Final report