Numerical Investigation for Inner Flow Fields and Structure Improvements of Medium Speed Mill

Abstract:

The numerical model for ZGM95 medium speed mill is built and the inner flow fields are simulated by employing the commercial code of FLUENT. The results show that the distributions of the static pressure and the flow rate are not uniform for 36 nozzle rings due to the primary air entering the mill only from one side. Two modified structures are assumed to improve the mills performances and the corresponding models are simulated further. The flow fields are still not good enough and the pressure drop increases sharply in the mill when blocking several nozzle rings, and this structure is not recommended if the amount of pulverizer rejects is not extremely huge. The structure with double-inlet can improve the distribution of the flow fields effectively in the mill and few pressure drops of the mill increase. However, the feasibility of the double-inlet structure is also depends on the field conditions. The pressure drop will be less and the flow fields will be better when adopting the horizontal inlet duct instead of the inclined one.

• Periodical: Advanced Materials Research (Volumes 732-733)
• Pages: 481-486
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.732-733.481
• Online since: August 2013
• Authors: Xian Ran Zhu, Cheng Yong Liu, Liang Cheng
• Keywords: First Air, Medium Speed Mill, Nozzle Ring, Numerical Simulation

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