Reduction of nitric oxide emissions on a full-scale cement kiln using primary air vitiation

Conference · Tue Jan 01 04:00:00 EST 1985 · Proc., Annu. Meet., Air Pollut. Control Assoc.; (United States)

OSTI ID:5625090

Hunter, S C; Benson, R C

Combustion modifications previously investigated in a laboratory-scale furnace and a subscale cement kiln were evaluated for emission reduction potential and effect on cement product quality. The full-scale kiln was a long dry process kiln firing pulverized coal. The kiln is rated at 1080 tons of cement per day with a thermal input of 240 x 10/sup 6/ Btu/hr. Of the combustion modifications evaluated in the previous studies, vitiation of the primary air with inert gas (nitrogen) was considered to be the best alternative for NO reduction on the full-scale kiln. Baseline NO emissions were observed to vary considerably as the result of process variations. NO emission factor, expressed as lb NO/sub 2//ton of clinker varied from 5.5 to 13.5. The mean 24-hour emission factor was 8+. 0.8 lb NO/sub 2//ton of clinker. Low excess air tests reduced NO emissions by approximately 20 percent when kiln exit O/sub 2/ was decreased from 1.8 to 0.8 percent. During nitrogen injection tests primary air O/sub 2/ was decreased to 12.5-13.0 percent, and NO was reduced 25-30 percent. Analyses of the cement clinker indicate that product quality was not affected as result of the tests, however longer term tests are required before this method could be implemented on a regular bases.

• Research Organization: KVB, Inc., Irvine, CA
• OSTI ID: 5625090
• Report Number(s): CONF-850612-
• Conference Information: Journal Name: Proc., Annu. Meet., Air Pollut. Control Assoc.; (United States) Journal Volume: 4
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR
AIR POLLUTION ABATEMENT
AIR POLLUTION MONITORING
BENCH-SCALE EXPERIMENTS
BUILDING MATERIALS
CARBONACEOUS MATERIALS
CEMENTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION CONTROL
COMPARATIVE EVALUATIONS
CONTROL
DEMAND
DILUTION
DRYING
ELEMENTS
ENERGY DEMAND
ENERGY SOURCES
FLUE GAS
FLUIDS
FOSSIL FUELS
FUEL-AIR RATIO
FUELS
FURNACES
GASEOUS WASTES
GASES
INDUSTRIAL PLANTS
KILNS
MATERIALS
NITRIC OXIDE
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OPERATIONS RESEARCH
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
PROCESS CONTROL
PULVERIZED FUELS
REMOVAL
THERMOCHEMICAL PROCESSES
WASTES