Numerical Simulation of Ash Vaporization during Pulverized Coal Combustion in the Laboratory-Scale Single-Burner Furnace

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• 作者：Jiancai Sui ; Minghou Xu ; Jihua Qiu ; Yu Qiao ; Yun Yu ; Xiaowei Liu ; and Xiangpeng Gao
• 刊名：Energy & Fuels
• 出版年：2005
• 出版时间：July 2005
• 年：2005
• 卷：19
• 期：4
• 页码：1536 - 1541
• 全文大小：461K
• 年卷期：v.19,no.4(July 2005)
• ISSN：1520-5029

文摘

CFD tools have been developed to effectively simulate complex, reacting, multiphase flows thatexist in utility boilers. In this paper, a model of ash vaporization was established and integratedinto a self-developed CFD code to predict ash vaporization in the coal combustion process.Experimental data from a single-particle combustion was used to validate the above model. Thecalibrated model was then applied to simulate the ash vaporization in a 92.9 kW laboratory-scale single-burner furnace. The effects of different combustion conditions, including air staging,on the ash vaporization were investigated. The results showed that the fraction of ash vaporizationis mostly sensitive to coal particle temperature. Ash vaporization primarily occurred after a shortinterval along the coal particle trajectories when the particle temperatures increased to 1800 K.Air staging influenced the ash vaporization by changing the gas temperature distribution in thefurnace. The simulation results showed that the more extreme the staging condition, the lowerthe overall peak temperature, and hence the lower the amount of ash vaporization.