Preliminary measurements of fuel nitric oxide formation in a pulverized coal transport reactor

Journal Article · Sun Jan 01 04:00:00 EST 1978 · J. Air Pollut. Control Assoc.; (United States)

DOI:https://doi.org/10.1080/00022470.1978.10470559· OSTI ID:6839126

Vogt, R A; Laurendeau, N M

Measurements were made of NO emissions from coal, coke and char. Results were as follows: (1) At wall temperatures as low as 800/sup 0/ to 1100/sup 0/C (without flame conditions), fuel nitrogen can achieve a 10 to 25% conversion to NO. (2) Fuel NO emissions from coal are temperature dependent at low temperatures. (3) There is a particular wall temperature (750/sup 0/ to 950/sup 0/C) above which fuel NO emissions exhibit a large increase. (4) Above this temperature, excess air promotes conversion efficiency. (5) Volatile NO emissions are significant at wall temperatures as low as 750/sup 0/C. Conclusion 1 is consistent with fluidized bed work indicating the importance of fuel NO at low temperature. Similarly, results from fluidized bed studies suggest that fuel NO is temperature dependent at low temperatures, in agreement with conclusion 2. Fuel NO is only weakly temperature dependent under pulverized coal furnace conditions. Conclusion 3 is consistent with the rapid increase in reaction rate observed at 700/sup 0/ to 1000/sup 0/C for pyridine pyrolysis and oxidation. Conclusion 4 is in agreement with flat flame work using nitrogen doped fuels. Finally, whereas fluidized bed work has shown the importance of char NO at low temperatures, conclusion 5 indicates that the low temperature conversion of volatiles to NO cannot be dismissed. This will be particularly true for pulverized coal systems. Based on the exhaust data presented here, future work will concentrate on using this experimental technique to develop kinetic models for NO formation from coal. Necessary equipment modifications include a preheater and three-zone furnace to maintain isothermal conditions and internal probing to investigate the influence of residence time.

• Research Organization: Purdue Univ., Lafayette, IN
• OSTI ID: 6839126
• Journal Information: J. Air Pollut. Control Assoc.; (United States), Journal Name: J. Air Pollut. Control Assoc.; (United States) Vol. 28:1; ISSN JPCAA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COKE
COMBUSTION
COMBUSTION KINETICS
COMBUSTION PRODUCTS
CONVERSION
ENERGY SOURCES
FLUIDIZED BED
FOSSIL FUELS
FUELS
GASEOUS WASTES
KINETICS
MATHEMATICAL MODELS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
TEMPERATURE DEPENDENCE
WASTES