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Evaluation of primary air vitiation for nitric oxide reduction in a rotary cement kiln. Volume 1. Technical report. Final report, June 1983-September 1985

Technical Report ·
OSTI ID:7127016
;
The report gives results of tests to evaluate combustion modifications for nitric oxide (NO) reduction and cement-product quality in a pilot-scale long-dry-process cement kiln firing pulverized coal. The kiln is rated at 11.35 kg/s (1080 tons/day) of cement with a thermal input rate of 70.3 MW (240 million Btu/hr). Of the combustion modifications evaluated in previous studies, vitiation of the primary air with inert gas (nitrogen) was considered the best alternative for NO reduction on a pilot-scale kiln. The percent reduction was established from a reference baseline of 1050 ppm (corrected to 3% O/sub 2/) and a kiln exit oxygen of 1.82%. The NO volumetric emissions were lowered to 880 ppm (corrected to 3% O/sub 2/) with a kiln exit oxygen of 0.7%. NOx reductions during the short-term nitrogen injection tests were about 25-30% with no adverse effects on product quality. Because of the interacting feed chemistry/kiln operations, it was not possible to clearly isolate the effect of nitrogen injection.
Research Organization:
KVB, Inc., Irvine, CA (USA)
OSTI ID:
7127016
Report Number(s):
PB-87-113247/XAB
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
CARBONACEOUS MATERIALS
CEMENT INDUSTRY
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
CONTROL
ENERGY SOURCES
FOSSIL FUELS
FUELS
INDUSTRY
KILNS
MATERIALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PULVERIZED FUELS
QUALITY ASSURANCE
THERMOCHEMICAL PROCESSES