Numerical Simulation of Oxy-coal Combustion for a Swirl Burner with EDC Model

崔凯; 刘冰; 吴玉新; 杨海瑞; 吕俊复; 张海

doi:10.1016/S1004-9541(14)60032-X

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Numerical Simulation of Oxy-coal Combustion for a Swirl Burner with EDC Model

能源、资源与环境技术 | Updated：2026-01-06

- Numerical Simulation of Oxy-coal Combustion for a Swirl Burner with EDC Model
- Chinese Journal of Chemical Engineering Vol. 22, Issue 2, Pages: 193-2011004-9541(2014)
- Affiliations：
  
  Key Laboratory for Thermal Science and Power Engineering of Ministry Education, Department of Thermal Engi-neering, Tsinghua University,Beijing,China,100084
- Author bio：
- Funds：
- DOI：10.1016/S1004-9541(14)60032-X
  CLC：
- Published：2014
- Accepted：
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CUI Kai, LIU Bing, WU Yuxin, YANG Hairui, LÜ Junfu, ZHANG Hai. Numerical Simulation of Oxy-coal Combustion for a Swirl Burner with EDC Model[J]. Chin.J.Chem.Eng., 2014, 22(2): 193-201.
DOI：

CUI Kai, LIU Bing, WU Yuxin, YANG Hairui, LÜ Junfu, ZHANG Hai. Numerical Simulation of Oxy-coal Combustion for a Swirl Burner with EDC Model[J]. Chin.J.Chem.Eng., 2014, 22(2): 193-201. DOI： 10.1016/S1004-9541(14)60032-X.

摘要

Abstract

The characteristics of oxy-coal combustion for a swirl burner with a specially designed preheating chamber are studied numerically. In order to increase the accuracy in the prediction of flame temperature and ignition position

eddy dissipation concept (EDC) model with a skeletal chemical reaction mechanism was adopted to describe the combustion of volatile matter. Simulation was conducted under six oxidant stream conditions with different O

/CO

molar ratios: 21/79/0

30/70/0

50/50/0

21/0/79

30/0/70 and 50/0/50. Results showed that O

enrichment in the primary oxidant stream is in favor of combustion stabilization

acceleration of ignition and increase of maximum flame temperature

while the full substitution of N

by CO

in the oxidant stream delays ignition and decreases the maximum flame temperature. However

the overall flow field and flame shapes in these cases are very similar at the same flow rate of the primary oxidant stream. Combustion characteristics of the air-coal is similar to that of the oxy-coal with 30% O

and 70% CO

in the oxidant stream

indicating that the rear condition is suitable for retrofitting an air-coal fired boiler to an oxy-coal one.

The swirl burner with a specially designed preheating chamber can increase flame temperature

accelerate ignition and enhance burning intensity of pulverized coal under oxy-coal combustion. Also

qualitative experimental validation indicated the burner can reduce the overall NO

emission under certain O

enrichment and oxy-coal combustion conditions against the air-coal combustion.

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