NO/sub x/ formation and kinetics of NO/sub x/ reduction in fluidized bed combustion of carbonaceous materials. [Including staged combustion and various fuel-air ratios]
Staged air firing is considered to be the most promising method for nitric oxide emission control. In this operation the fluidized bed is maintained under a deficiency of air and the design factors influencing sulfur retention, formation and destruction of nitric oxide, ammonia and other nitrogeneous compounds, and combustion efficiency are complex interactions. The optimum design of a fluidized bed combustor requires sound qualitative information concerning the behavior of nitric oxide formation and quantitative descriptions of the kinetics of NO destruction. The objective of this report is to describe the recent findings concerning NO/sub x/ formation and the kinetics of NO/sub x/ reduction reactions. The NO emission under an excess air condition was decreased with an increase in the volatile contents of fuels. The emission of NO and other nitrogeneous contents formed under a substoichiometric combustion was also strongly dependent on the volatile contents. The staged combustion of less volatile char and coke provided a radical reduction of NO emission. The steady state carbon concentration was measured and NO emission was found to be inversely related to the carbon concentration. The intrinsic conversion ratio of fuel nitrogen to NO was measured. The kinetics of NO destruction by char in both the absence and presence of oxygen was investigated. The rate for char was increased up to 750/sup 0/C. NO was reduced catalytically by carbon monoxide and hydrogen over a char surface, but the rate was not increased.
- Research Organization:
- Univ. of Tokyo, Bunkyo-Ku, Japan
- OSTI ID:
- 6690416
- Report Number(s):
- CONF-820304-Vol.2
- Journal Information:
- Prepr. Pap. - Am. Chem. Soc., Div. Fuel Chem.; (United States), Journal Name: Prepr. Pap. - Am. Chem. Soc., Div. Fuel Chem.; (United States) Vol. 27:1; ISSN ACFPA
- Country of Publication:
- United States
- Language:
- English
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ACTIVATION ENERGY
AIR POLLUTION ABATEMENT
AMMONIA
ARRHENIUS EQUATION
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTIONS
COAL
COKE
COMBUSTION
DATA
ENERGY
ENERGY SOURCES
EQUATIONS
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUEL-AIR RATIO
FUELS
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
MATERIALS
MATTER
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
PYROLYSIS PRODUCTS
THERMOCHEMICAL PROCESSES
VOLATILE MATTER