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A Reduced Reaction Scheme for Volatile Nitrogen Conversion in Coal Combustion

 

作者: L. S. PEDERSEN,   P. GLARBORG,   K. DAM-JOHANSEN,  

 

期刊: Combustion Science and Technology  (Taylor Available online 1998)
卷期: Volume 131, issue 1-6  

页码: 193-223

 

ISSN:0010-2202

 

年代: 1998

 

DOI:10.1080/00102209808935761

 

出版商: Taylor & Francis Group

 

关键词: Reduced reaction mechanism;coal combustion;NOxformation;HCN oxidation

 

数据来源: Taylor

 

摘要:

In pulverised coal flames, the most important volatile nitrogen component forming NOx, is HCN. To be able to model the nitrogen chemistry in coal flames it is necessary to have an adequate model for HCN oxidation. The present work was concerned with developing a model for HCN/NH3/NO conversion based on systematic reduction of a detailed chemical kinetic model. Models of different complexity were developed and tested under conditions similar to those in a pulverised coal flame. Comparisons of the models were made for ideal chemical reactors simulations (plug flow reactor and well-stirred reactor). Provided that the CO/H2chemistry was described adequately, the reduced HCN/NH3/NO model compared very well with the detailed model over a wide range of stoichiometries. Decoupling of the HCN chemistry from the CO/H2chemistry resulted in over-prediction of the HCN oxidation rate under fuel rich conditions, but had negligible effect on the CO/H2chemistry. Comparison with simplified HCN models from the literature revealed significant differences, indicating that these models should be used cautiously in modelling volatile nitrogen conversion.

 

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