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

Conference · Sun Jul 01 04:00:00 EDT 1984

OSTI ID:6808252

Weber, G F; Schelkoph, G L; Ness, H M

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 SO/sub 2/ sorbent materials with subsequent collection on ceramic bags in a high-temperature baghouse is the SO/sub 2/ 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 SO/sub 2/ 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% Fe/sub 2/O/sub 3/, and up to 65% reduction using a synthetic mordenite have been observed. Control of NO/sub x/ emissions with an ammonia/selective catalytic reduction (NH/sub 3//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 NH/sub 3//SCR system. Eighty percent SO/sub 2/ and NO/sub x/ reduction were achieved at a Ca/S ratio of 2.0 and a NH/sub 3//NO ratio of 1.0, respectively.

• Research Organization: North Dakota Univ., Grand Forks (USA). Energy Research Center; USDOE Grand Forks Project Office, ND
• DOE Contract Number: FC21-83FE60181
• OSTI ID: 6808252
• Report Number(s): DOE/FE/60181-60; CONF-840971-2; ON: DE84014635
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
ADSORPTION
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
AMMONIA
BAGHOUSES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBONACEOUS MATERIALS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
CONTROL
DENITRIFICATION
DESULFURIZATION
ELEMENTS
EMISSION
ENERGY SOURCES
EQUIPMENT
FLUE GAS
FOSSIL FUELS
FUELS
GASEOUS WASTES
HYDRIDES
HYDROGEN COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IRON
MATERIALS
METALS
MINERALS
MORDENITE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
REMOVAL
SILICATE MINERALS
SORPTION
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
TESTING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
WASTES
ZEOLITES