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Numerical study of particle behaviours and heat transfer in a complex rotary kiln
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Rotary kiln is widely used for thermal disposal of solid waste due to its effectiveness and high efficiency in recent years.To further improve the processing efficiency,a newly designed rotary kiln with three-section structure is proposed,and the behaviours of particle motion and heat transfer are investi-gated.Firstly,a lab-scale rotary kiln is manufactured,and experiments are carried out.Verified by experimental data,a CFD-DEM numerical model is developed to analyze the particle motion and heat transfer characteristics with the effects of inlet flue gas temperature,feeding rate and rotating speed.The results show that the outlet temperature increases linearly with the flue gas temperature,while it is negatively correlated with the feeding rate and rotating speed.In addition,the volumetric heat transfer coefficient in this complex rotary kiln is analyzed,the overall heat transfer coefficient is between 200 and 700 W/(m3 K).
The Institute for Energy Engineering,China Jiliang University,Hangzhou,310000,China
Qingshanhu Energy Research Center,Zhejiang University,Hangzhou,311305,China
State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou,310027,China
Beijing Construction Engineering Group Environmental Remediation Co.,Ltd,Beijing,100015,China
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National Natural Science Foundation of ChinaKey R&D Program of Zhejiang provincethe"Leading Goose"R&D Program of Zhejiang provinceNational Key R&D Program of China
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