Nitrogen oxide abatement by distributed fuel addition. Quarterly report No. 11, February 1, 1990--April 30, 1990
The formation and destruction of nitrogenous species in the fuel rich coal post flame of a laboratory coal combustor were explored. The fuel rich zones in reburning and air staging configurations were compared under a variety of conditions. The objective was to determine the relative significance of homogeneous and heterogeneous sources of HCN formation and to extract models that can predict nitrogenous species profiles in fuel rich zones. Heterogeneous effects on HCN formation due to the slow release of nitrogen from the coal residue were of minor significance. HCN formation and destruction in fuel rich regimes were governed by homogeneous gas phase kinetics. The contribution of Fenimore nitrogen fixation reaction of HCN formation limited the destruction of nitrogenous species in fuel rich regimes. The interconversion of nitrogenous species in the fuel rich pulverized coal post flame could be adequately described by a simplified mechanism based on known fundamental gas phase kinetics with no adjustment of rate coefficients and partial equilibrium assumptions. The proposed model was successful at predicting NO, HCN and NH{sub 3} profiles under reducing conditions in both reburning and staged combustion configurations.
- Research Organization:
- Arizona Univ., Tucson, AZ (United States). Dept. of Chemical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-87PC79850
- OSTI ID:
- 10112080
- Report Number(s):
- DOE/PC/79850--11; ON: DE92005213
- Country of Publication:
- United States
- Language:
- English
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