Numerical study of coarse coal particle breakage in pneumatic conveying |
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| Affiliation: | 1. Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, 84105 Beersheba, Israel;1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China;2. Priority Research Centre for Frontier Energy Technologies & Utilisation, The University of Newcastle, Australia;3. Priority Research Centre for Advanced Particle Processing and Transport, The University of Newcastle, Australia;1. Aaron Fish Chair in Mechanical Engineering – Fracture Mechanics, Israel;2. Laboratory for Conveying and Handling of Particulate Solids, Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel;1. School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China;2. School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China |
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| Abstract: | Pneumatic conveying of coarse coal particles with various pipeline configurations and swirling intensities was investigated using a coupled computational fluid dynamics and discrete element method. A particle cluster agglomerated by the parallel-bond method was modeled to analyze the breakage of coarse coal particles. The numerical parameters, simulation conditions, and simulation results were experimentally validated. On analyzing total energy variation in the agglomerate during the breakage process, the results showed that downward fluctuation of the total particle energy was correlated with particle and wall collisions, and particle breakage showed a positive correlation with the energy difference. The correlation between the total energy variation of a particle cluster and particle breakage was also analyzed. Particle integrity presented a fluctuating upward trend with pipe bend radius and increased with swirling number for most bend radii. The degree of particle breakage differed with pipeline bending direction and swirling intensity: in a horizontal bend, the bend radius and swirling intensity dominated the total energy variations; these effects were not observed in a vertical bend. The total energy of the particle cluster exiting a bend was generally positively correlated with the bend radius for all conditions and was independent of bending direction. |
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| Keywords: | Computational fluid dynamics–discrete element method Pneumatic conveying Pipeline configuration Swirling intensity Coarse coal particle Breakage |
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