Advanced staged combustion configurations for pulverized coal. Topical report No. 1. Fuel nitrogen conversion during fuel-rich combustion of pulverized coal and char

Technical Report · Tue Dec 01 04:00:00 EST 1981

OSTI ID:5191817

Glass, J W; Wendt, J O.L.

The relative importance of homogeneous and heterogeneous mechanisms governing the destruction of chemically bound nitrogen during the fuel rich combustion of a Utah bituminous pulverized coal and its char was determined. Pulverized fuels were burned in a self sustaining but well characterized mode in a 15 cm ID downflow combustor. Measurements included time resolved profiles of major species, minor nitrogenous species and char nitrogen concentrations as well as (thermocouple) gas and (optical) particle temperatures. Data from fuel-rich char combustion studies (SR=0.8,0.4) show that concentrations of HCN and NH/sub 3/ in the post flame gases were small compared to the concentration of NO. NO destruction was found to be controlled by an heterogeneous mechanism involving the char carbon surface and this mechanism, which is deactivated by oxygen, was modeled, yielding rates consistent with those in the literature. The fuel rich coal combustion studies yielded profiles of high concentrations of HC, NO and NH/sub 3/. The decay of NO in the post flame was not consistent with the heterogeneous rate determined from the char data. Rather, the data show that reactions in the gas phase dominate and the global homogeneous kinetics equations given describe (with one exception) the post-flame nitrogenous species concentrations. This is consistent with the gas phase kinetics of Fenmore.

• Research Organization: Arizona Univ., Tucson (USA). Dept. of Electrical Engineering
• DOE Contract Number: AC21-79ET15184
• OSTI ID: 5191817
• Report Number(s): DOE/ET/15184-1152; ON: DE82009323
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000 -- Coal
Lignite
& Peat-- Combustion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACTIVATION ENERGY
AMMONIA
ARRHENIUS EQUATION
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL
COMBUSTION
COMBUSTION PRODUCTS
COMPUTER CALCULATIONS
CYANIDES
DATA
DEVOLATILIZATION
DOCUMENT TYPES
ENERGY
ENERGY SOURCES
EQUATIONS
EXPERIMENTAL DATA
FOSSIL FUELS
FUEL-AIR RATIO
FUELS
GAS CHROMATOGRAPHY
HYDRIDES
HYDROCYANIC ACID
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
KINETICS
MATERIALS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PYROLYSIS PRODUCTS
PYROMETERS
REACTION KINETICS
REVIEWS
SEPARATION PROCESSES
SIZE
TEST FACILITIES
THERMOCHEMICAL PROCESSES