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Mathematical Modeling of a 2.4 MW Swirling Pulverized Coal Flame

 

作者: André A. F. Peters,   Roman Weber,  

 

期刊: Combustion Science and Technology  (Taylor Available online 1997)
卷期: Volume 122, issue 1-6  

页码: 131-182

 

ISSN:0010-2202

 

年代: 1997

 

DOI:10.1080/00102209708935608

 

出版商: Taylor & Francis Group

 

关键词: Mathematical modeling;pulverized coal;turbulent diffusion flame;eddy break-up concept;nitric oxide formation;probability density functions

 

数据来源: Taylor

 

摘要:

Predictions and measurements of a swirling unstaged, high NOx, pulverized coal flame are presented. The predictions have been obtained by means of relatively simple models for turbulence, turbulent combustion and turbulent nitric oxide chemistry. Turbulence is modeled using the standard k-epsilon model. The turbulent combustion model incorporates a two-step reaction scheme together with an eddy break-up model. In the NO- chemistry model, thermal-NO and fuel-NO chemical reaction rates are statistically averaged over the fluctuating temperature using the Beta probability density function. Radiation is computed by means of the Discrete Transfer Radiation model. A constant linear absorption coefficient is assumed while scattering is not taken into account. The paper contains a unique, comprehensive comparison between predictions and measurements of a pulverized coal flame issued from an industrial-scale burner. The coal fired was Gottelborn hvBb coal. Attention is paid to velocities, turbulence quantities, temperatures, coal burnout levels and species concentrations of oxygen, carbon monoxide, carbon dioxide, nitrogen oxides precursors and nitrogen oxides. Radiative heat fluxes near the furnace refractory wall and the heat extraction of the cooling loops are addressed also.

 

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