Nitrogen oxide abatement by distributed fuel addition. Quarterly report No. 9, August 1, 1989--October 31, 1989
Experiments were conducted to investigate the processes that influence the destruction of NO in the fuel rich stage of the reburning process. The objective is to gain a better understanding of the mechanisms that control the fate of coal nitrogen in the fuel rich zone of a combustion process. Time resolved profiles of temperature, major (CO{sub 2}, CO, H{sub 2}O, O{sub 2}, H{sub 2} and N{sub 2}), nitrogenous (NO, HCN and NH{sub 3}) and hydrocarbon (CH{sub 4} and C{sub 2}H{sub 2}) species were obtained for various reburning tests. A slow continuous source of HCN was observed in the reburn zone for most tests. HCN formation from NO + CH{sub i} reactions would partially explain this trend. It has been proposed in the past that these reactions would be fast (less than 0.1s) and the produced HCN would be short lived. However, evidence was provided in this study indicating that NO + CH{sub i} reactions might contribute to HCN formation at longer residence times in the reburn zone. Reactions of molecular nitrogen with hydrocarbon radicals were determined to be a significant source of HCN formation, especially as NO levels decreased in the reburn zone. The results of several tests would justify the exclusion of continued coal devolatilization in the reburn zone as a major source of HCN.
- Research Organization:
- Arizona Univ., Tucson, AZ (United States). Dept. of Chemical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-87PC79850
- OSTI ID:
- 10109980
- Report Number(s):
- DOE/PC/79850--9; ON: DE92005211
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010800
014000
20 FOSSIL-FUELED POWER PLANTS
200202
54 ENVIRONMENTAL SCIENCES
540120
AIR POLLUTION ABATEMENT
AMMONIA
CARBON OXIDES
CHEMICAL REACTIONS
CHEMICALS MONITORING AND TRANSPORT
COAL
COMBUSTION
COMBUSTORS
DEVOLATILIZATION
FUEL INJECTION SYSTEMS
HYDROCARBONS
HYDROCYANIC ACID
HYDROGEN
METHANE
NITRIC OXIDE
NITROGEN
NITROGEN OXIDES
NOXIOUS GAS AND PARTICULATE EMISSIONS
OXYGEN
PROGRESS REPORT
REACTION INTERMEDIATES
STAGED COMBUSTION
WASTE MANAGEMENT
WATER