Title page for etd-0619118-105053


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URN etd-0619118-105053
Author Zhi-Hong Yang
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2017
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Study on the bottom-blowing erosion in converter by using numerical model
Date of Defense 2018-07-09
Page Count 64
Keyword
  • Multiphase Flow
  • Numerical Simulation
  • Water Model
  • Back-Attack
  • Converter Bottom-Blowing
  • Abstract The bottom-blowing process of the converter accelerates the erosion of refractory material near the tuyere and the tuyere tip. If the damage mechanism is understood and controlled, the life of the converter’s refractory material can be extended. This study simulates the water model’s bottom-blowing erosion experiment by using two phase flow VOF model, testing the degree of damage on the wall near the tuyere which was caused by gas back-attack in different bottom-blowing of flow rate. This study finds that the simulation result has great correspondence with the data of the experiment. The flow rate of bottom-blowing grow and the range of erosion expanded at the same time when the flow rate is low. However, when the flow rate gets to the critical flow rate, the range of damage will shrink. Besides, this study builds a hot model of steelmaking which simulated the real condition of bottom-blowing steelmaking. Besides the difference between liquid iron properties and water model, this study also considers the influence caused by the bottom-blowing-gas expanding by the heat after it enters the liquid iron. This study also finds that the range of damage of hot model bottom-blowing can reach to 12 times in tuyere diameter. The result of the simulation also indicated that the range of damage shrinks when the flow rate grows. When the flow rate grows to where the damage range is reduced, the degree of damage at the intermediate position still increases as the flow rate grows. The simulation result of a hot model can offer a reference to the flow rate of the converter’s bottom-blowing steelmaking. The simulation result of a hot model also can extend the using time of the converter by avoiding the flow range which causes strong damages, so it is helpful to enhance the efficiency of converter’s operation and reduce the cost of steelmaking.
    Advisory Committee
  • Chien-Hsiung Tsai - chair
  • Yung-Chang Liu - co-chair
  • Chien-Chou Tseng - co-chair
  • Sheng-Yen Hsu - advisor
  • Files
  • etd-0619118-105053.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2018-07-19

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