The effect of cofiring coal-water slurry fuel formulated from waste coal fines with pulverized coal on NOx emissions
- Pennsylvania State Univ., University Park, PA (United States)
The concept of using recovered coal fines as feedstock for CWSFs has both economic and environmental attraction. Cofiring technology provides benefits that include: the reclamation of waste coal fines from existing sites, a reduction in the need to dispose of fines at current preparation plants, expansion of the firing capacity of boilers limited by pulverizer capacity, and a reduction in NOx emissions. In 1994, a series of long duration CWSF cofire tests were conducted at the Seward Station, Seward, PA. Three dual fuel, low NOx burners (LNB) were installed in the bottom row of burners of Unit 14. These burners were designed specifically to cofire CWSF and pulverized coal. The CWSF was prepared from cleaned minus 100 mesh coal produced at the Homer City cleaning plant. Continuous emissions monitoring showed a reduction in NOx, increasing from 7 to 20 percent as the level of CWSF cofired was increased. The success with cofiring CWSFs made from fresh fines generated interest in formulating CWSFs from coal pond fines. Penn State had previously characterized several impoundment sites, formulated CWSFs from the coal fines collected from the sites and cofired the CWSFs in a research boiler. The objective of the current study was to prepare and cofire CWSF formulated from impounded coal fines in a utility boiler and to determine if the same reduction in NOx emissions occurred as when cofiring CWSF produced from fresh fines. A second objective was to determine the effect of burner configuration on NOx emissions. Following the original test burn in 1994, all six low NOx burners were converted to cofire CWSF, so that there was some flexibility in the cofiring burner arrangement.
- OSTI ID:
- 458542
- Report Number(s):
- CONF-960322--; ISBN 0-932066-21-6
- Country of Publication:
- United States
- Language:
- English
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