The use of pulverized coal and coal-water-slurry in reburning NO{sub x} control
Technical Report
·
OSTI ID:269420
- Energy and Environmental Research Corporation, Irvine, CA (United States); and others
Reburning is a NO{sub x} reduction technique which has been demonstrated on a number of coal-fired utility boilers. Unlike alternative control techniques such as low NO{sub x} burners and selective non-catalytic reduction, reburning can achieve high levels of control without increasing carbon-in-ash and without measurable by-product emissions. In the application of reburning, a wide range of fuels can be used in the process, including natural gas, fuel oil, and coal. This paper describes the results of pilot-scale studies to investigate the parameters influencing the use of coal-based fuels in the reburning process. Different pulverized coals, and coal-water-slurries made from recovered coal fines, were evaluated as potential reburning fuels in a pilot-scale facility designed to simulate representative boiler conditions. Results of these studies have confirmed the viability of coal as a reburning fuel in either pulverized or slurry form. The sub-bituminous and lignitic coals tested showed the potential to achieve high levels of NO{sub x} control, while performance with bituminous coals tended to be related to fuel nitrogen content and volatility. With all coals, reburning performance was also found to be strongly influenced by available residence time and by initial NO{sub x} levels. The test results provide insight into the impacts of coal type and properties on the reburning process and provide critical information needed to optimize the use of coal-based fuels in application of reburning to utility boilers.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 269420
- Report Number(s):
- EPRI-TR--105978-V4; CONF-9505150--Vol.4
- Country of Publication:
- United States
- Language:
- English
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