Factors affecting NO/subX/ production during char oxidation. [From nitrogen containing organic compounds]

Conference · Tue Apr 01 04:00:00 EST 1986 · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)

OSTI ID:5547446

Orehowsky, G J; Scaroni, A W; Derbyshire, F J

Acid rain is an issue of growing concern particularly in the Northeastern United States. Although SO/sub 2/ emissions are most often identified as the principal precursors to acid rain, NO/sub X/ emissions may also play an important role in acid rain formation. Before methods can be fully developed for limiting NO/sub X/ emissions from solid fuel combustors, a more detailed understanding of the reaction chemistry of fuel-bound nitrogen during oxidation must be obtained. During combustion, NO/sub X/ is formed either by reaction of oxygen and atmospheric nitrogen (thermal NO/sub X/) or oxidation of chemically bound nitrogen in the fuel (fuel NO/sub X/). Production of thermal NO/sub X/ is reduced mainly by lowering the flame temperature. Reduction of thermal NO/sub X/ alone may not lower NO/sub X/ to acceptable limits, and thus it will be necessary also to limit the formation of fuel NO/sub X/. Fuel nitrogen is converted to NO/sub X/ through two pathways: homogeneous oxidation of nitrogen-containing volatiles and heterogeneous oxidation of nitrogen in char. It is the latter reaction which is the subject of this paper. The present work considers oxidation of chars produced from nitrogen-containing organic compounds. The investigation was conducted to determine the relative reactivities of carbon and nitrogen atoms during char oxidation. The effects of nitrogen content on overall char reactivity and on conversion of nitrogen to NO/sub X/ were also studied. There have been a limited number of studies on the relative reactivity, and conversion to NO/sub X/, of char nitrogen. Oxidation has been reported to show no selectivity for carbon or nitrogen loss during oxidation of a 1750 K lignite char at 1250 K.

• Research Organization: Dept. of Materials Science and Engineering, The Pennsylvania State Univ., University Park, PA 16802
• OSTI ID: 5547446
• Conference Information: Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 31:2
• Country of Publication: United States
• Language: English

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01 COAL, LIGNITE, AND PEAT
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54 ENVIRONMENTAL SCIENCES
ACID RAIN
ACTIVATION ENERGY
AIR POLLUTION CONTROL
AIR QUALITY
ATMOSPHERIC PRECIPITATIONS
BROWN COAL
CARBON
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COAL
COMBUSTION PRODUCTS
CONTROL
ELEMENTS
ENERGY
ENERGY SOURCES
ENVIRONMENTAL QUALITY
FEDERAL REGION I
FEDERAL REGION II
FLAME PROPAGATION
FOSSIL FUELS
FUELS
KINETICS
LIGNITE
MATERIALS
MATTER
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
NORTH AMERICA
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLLUTION CONTROL
PRECURSOR
PYROLYSIS PRODUCTS
RAIN
REACTION KINETICS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE CONTROL
USA
VERY HIGH TEMPERATURE
VOLATILE MATTER
YIELDS