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Pilot scale studies of simultaneous control of SO/sub x//NO/sub x/ emissions derived from the combustion of low-rank coal

Author
Weber, G. F.
Published
United States : [publisher not identified], 1984
Springfield, Va.: National Technical Information Service, [approximately 1984]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Ness, H. M. and Schelkoph, G. L.

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Summary
Simultaneous control of SO/sub x//NO/sub x/ emissions, derived from the combustion of low-rank coal, is being investigated at the University of North Dakota Energy Research Center (UNDERC). Process development work has been performed on both bench-scale and pilot-scale systems. Direct furnace injection of calcium-based SO2 sorbent materials with subsequent collection on ceramic bags in a high-temperature baghouse is the SO2 control technique being evaluated. Control of NO/sub x/ emissions is accomplished in conjunction with the high-temperature baghouse by catalytic reduction methods. Furnace injection tests have focused on the direct injection of pressure hydrated lime at flue gas temperature regimes ranging from 1500 to 3000/sup 0/F (815 to 1650/sup 0/C) followed by collection in a baghouse operated at temperatures up to 1000/sup 0/F (540/sup 0/C). Sorbent utilization values of approximately 40% at Ca/S mole ratios of 1.0 to 2.0 have been observed. Residence time and the temperature regime of the sorbent injection location appear to be the critical parameters controlling SO2 retention and sorbent utilization. Catalytic reduction of NO/sub x/ using throwaway catalysts collected in the high-temperature baghouse is being investigated. Materials containing various forms of iron and a synthetic mordenite have been evaluated. Reductions of up to 29% were achieved with a lignite fly ash containing about 8% Fe2O3, and up to 65% reduction using a synthetic mordenite have been observed. Control of NO/sub x/ emissions with an ammonia/selective catalytic reduction (NH3/SCR) reactor, located downstream of the high-temperature baghouse, has been successfully demonstrated. Simultaneous SO/sub x//NO/sub x/ control was demonstrated using direct furnace injection of pressure hydrated lime and the NH3/SCR system. Eighty percent SO2 and NO/sub x/ reduction were achieved at a Ca/S ratio of 2.0 and a NH3/NO ratio of 1.0, respectively.
Report Numbers
DE84014635; DOE/FE/60181-60; CONF-840971-2
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: FC21-83FE60181
OSTI Identifier 6808252
Research organization: North Dakota Univ., Grand Forks (USA). Energy Research Center.
Research organization: USDOE Grand Forks Project Office, ND.
View MARC record | catkey: 47343286