Nitrogen oxide abatement by distributed fuel addition
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:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-87PC79850
- OSTI ID:
- 6039249
- Report Number(s):
- DOE/PC/79850-9; ON: DE92005211
- Country of Publication:
- United States
- Language:
- English
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Nitrogen oxide abatement by distributed fuel addition
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54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION ABATEMENT
ALKANES
AMMONIA
CARBON COMPOUNDS
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
CYANIDES
DEVOLATILIZATION
DOCUMENT TYPES
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUELS
HYDRIDES
HYDROCARBONS
HYDROCYANIC ACID
HYDROGEN
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MATERIALS
METHANE
NITRIC OXIDE
NITROGEN
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
PROGRESS REPORT
REACTION INTERMEDIATES
STAGED COMBUSTION
THERMOCHEMICAL PROCESSES
WATER