Mechanisms governing the destruction of nitrogeneous species during the fuel-rich combustion of pulverized coal

Conference · Fri Jan 01 04:00:00 EST 1982 · Symp. (Int.) Combust., (Proc.); (United States)

OSTI ID:5730213

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

A 2kg/h downflow combustor was used to investigate the fuel-rich combustion of a Utah coal char. Time resolved profiles of major and minor nitrogeneous species, of char nitrogen concentrations, and of optical particle temperatures, allowed global heterogeneous kinetics of NO destruction to be evaluated. Similar data from the parent Utah bituminous coal at SR = 0.8 and SR = 0.4 yielded time resolved profiles of high concentrations of HCN, NO and NH/sub 3/. The decay of NO in the coal post flame was not consistent with the heterogeneous rate determined from the char data. Rather, the data suggest that reactions in the gas phase dominate and that the destruction of NO, NH/sub 3/ and HCN can be quantitatively modeled using Fenimore's gas phase mechanism with the folowing rate constants: r/sub 1/ = d/dt(HCN) = -5.5 x 10/sup 17/ exp (-83,300/RT) (HCN) (H/sub 2/O)/(H/sub 2/)/sup 1///sup 2/ mole/cm/sup 3/s r/sub 2/ = d/dt (NO) = -2.2 x 10/sup 16/ exp(-54,400/RT) (NO) (NH/sub 3/)/(H/sub 2/)/sup 1///sup 2/ mole/cm/sup 3/s and with d/dt (NH/sub 3/) = d/dt (NO) - d/dt (HCN).

• Research Organization: Univ. of Arizona, Tucson
• OSTI ID: 5730213
• Report Number(s): CONF-820801-
• Conference Information: Journal Name: Symp. (Int.) Combust., (Proc.); (United States)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
AMMONIA
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
COAL
COMBUSTION KINETICS
COMBUSTORS
CYANIDES
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDRIDES
HYDROCYANIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MATERIALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS PRODUCTS
REACTION KINETICS
YIELDS