Numerical analysis on effect of furnace scale on heat transfer mechanism of coal particles in pulverized coal combustion field

2016 ◽  
Vol 145 ◽  
pp. 20-30 ◽  
Author(s):  
Nozomu Hashimoto ◽  
Hiroaki Watanabe
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Coal Combustion ◽  
Pulverized Coal ◽  
Transfer Mechanism ◽  
Pulverized Coal Combustion ◽  
Heat Transfer Mechanism ◽  
Coal Particles ◽  
Furnace Scale

Development of Radiative Heat Transfer Model for Pulverized Coal Combustion

2008 ◽  
Vol 34 (3) ◽  
pp. 344-350 ◽  
Author(s):  
Toshimitsu Asotani ◽  
Toru Yamashita ◽  
Hiroaki Tominaga ◽  
Yoshinori Itaya ◽  
Shigekatu Mori
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Coal Combustion ◽  
Radiative Heat ◽  
Heat Transfer Model ◽  
Pulverized Coal ◽  
Transfer Model ◽  
Pulverized Coal Combustion

Influence of Index of Refraction and Particle Size Distribution on Radiative Heat Transfer in a Pulverized Coal Combustion Furnace

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Robert Johansson ◽  
Tim Gronarz ◽  
Reinhold Kneer
Keyword(s):  
Heat Transfer ◽  
Particle Size ◽  
Radiative Heat Transfer ◽  
Coal Combustion ◽  
Radiative Heat ◽  
Pulverized Coal ◽  
Index Of Refraction ◽  
Pulverized Coal Combustion ◽  
Complex Index ◽  
Complex Index Of Refraction

In this work, the influence of the radiative properties of coal and ash particles on radiative heat transfer in combustion environments is investigated. Emphasis is placed on the impact on the impact of the complex index of refraction and the particle size on particle absorption and scattering efficiencies. Different data of the complex index of refraction available in the literature are compared, and their influence on predictions of the radiative wall flux and radiative source term in conditions relevant for pulverized coal combustion is investigated. The heat transfer calculations are performed with detailed spectral models. Particle radiative properties are obtained from Mie theory, and a narrow band model is applied for the gas radiation. The results show that, for the calculation of particle efficiencies, particle size is a more important parameter than the complex index of refraction. The influence of reported differences in the complex index of refraction of coal particles on radiative heat transfer is small for particle sizes and conditions of interest for pulverized coal combustion. For ash, the influence of variations in the literature data on the complex index of refraction is larger, here, differences between 10% and 40% are seen in the radiative source term and radiative heat fluxes to the walls. It is also shown that approximating a particle size distribution with a surface area weighted mean diameter, D32, for calculation of the particle efficiencies has a small influence on the radiative heat transfer.

A Numerical Analysis of Pulverized Coal Combustion in a Multiburner Furnace

2007 ◽  
Vol 21 (4) ◽  
pp. 1950-1958 ◽  
Author(s):  
Nozomu Hashimoto ◽  
Ryoichi Kurose ◽  
Hirofumi Tsuji ◽  
Hiromi Shirai
Keyword(s):  
Numerical Analysis ◽  
Coal Combustion ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion

Analysis of Radiative Heat Transfer Model for Pulverized Coal Combustion

2004 ◽  
Vol 2004 (0) ◽  
pp. 331-332
Author(s):  
Akinori GOTO ◽  
Hideto HAGIYA ◽  
Yoshio Morozumi ◽  
Hideyuki AOKI ◽  
Takatoshi MIURA
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Coal Combustion ◽  
Radiative Heat ◽  
Heat Transfer Model ◽  
Pulverized Coal ◽  
Transfer Model ◽  
Pulverized Coal Combustion

Development and Validation of a Coal Combustion Model for Pulverised Coal Combustion

2010 ◽  
Author(s):  
M. J. Chernetsky ◽  
A. A. Dekterev
Keyword(s):  
Coal Combustion ◽  
Pulverized Coal ◽  
Laboratory Scale ◽  
Combustion Model ◽  
Pulverized Coal Combustion ◽  
Nox Formation ◽  
Coal Particles ◽  
Model Predictions ◽  
Char Burnout ◽  
Development And Validation

To fully understand the processes of heat-and-mass transfer on the laboratory-scale and full-scale coal boilers, computer models are needed to develop, which can predict flow fields, heat transfer and the combustion of the coal particles with reasonable accuracy. In the work reported here, a comprehensive model for pulverized coal combustion has been presented. Attention has been given to the char burnout submodel, NOx formation sub-model and accurate calculation of the temperature of the particles. The model predictions have been compared with the experimental measurements of the laboratory-scale pulverized-coal combustion burner.

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