Title of article :
Numerical study on the spatial distribution of energy release during char combustion
Author/Authors :
Gu، نويسنده , , Mingyan and Zhang، نويسنده , , Ming-chuan and Yu، نويسنده , , Juan and Wei-dong، نويسنده , , Fan and Tian، نويسنده , , Feng-guo، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Pages :
11
From page :
1060
To page :
1070
Abstract :
The energy distribution coefficient (Xc), the fraction of the total heat of reaction released at the char surface during combustion of char particles, was studied using the improved moving flame front (MFF) model. The energy distribution coefficient (Xc), considering homogeneous oxidation of CO in the boundary layer of the particle and reduction of CO2 at the surface, was derived explicitly. Under conditions in practical pulverized coal flames, the energy distribution coefficient (Xc) and the effective energy distribution coefficient (Xe), based on the heat-release calculated using the traditional single film model with CO as the only reaction product (SF-CO), were calculated and compared with the value commonly used in the SF-CO model. The results obtained show that the smaller the particle diameter, the greater the energy distribution coefficient. For the same particle diameter, the higher the particle temperature, the lower the energy distribution coefficient. Under the conditions of the calculation, the average value of the energy distribution coefficient Xc is approximately 0.7, and the average value of the effective SF-CO energy distribution coefficient is greater than 0.5, significantly larger than the value of 0.3 obtained by the traditional single film model.
Keywords :
Pulverized coal flame , Energy distribution coefficient , Single film (SF-CO) model , Moving flame front (MFF) model , Combustion of char particle
Journal title :
Applied Energy
Serial Year :
2008
Journal title :
Applied Energy
Record number :
1602621
Link To Document :
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