Title page for etd-0619118-173605


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URN etd-0619118-173605
Author Le-Kuan Lin
Author's Email Address yy0928@gmail.com
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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 The investigation of solid accretion at the tip of bottom-blowing tuyere in steelmaking process by using water-model experiment
Date of Defense 2018-07-09
Page Count 100
Keyword
  • water-model experiment
  • double tuyere
  • solid accretion
  • steelmaking
  • scrap
  • Abstract This study successfully established a water-model experiment to investigate the solid accretion on the tip of the double bottom-blowing tuyere. This study observes the effects of different parameters on the type and size of the solid accretion. In the experiment, the outer and inner tubes respectively blow gases of normal temperature and extremely low temperature to simulate oxygen-exothermic and hydrocarbon-gas-endothermic reaction. This study changes the operating conditions, including water temperature, gas flow and material for experiment. It is found that, the shape of solid accretion is hemispherical. The solid accretion can protect the bottom of the furnace from back-attack and contacting with liquid. Furthermore, in the solid accretion, a lot of small channels are above the outer tube and a main waterway is above the inner tube. The gases from the outer and inner tube are separated by the solid accretion and the structure of the solid accretion is similar to the schematic from existing document. The experiment operation was varied to understand the effects on the solid accretion. It is found that the solid accretion’s size increases when water temperature drops, outer gas flow rate increases, and inner gas flow rate decreases. In addition, according to the heat-transfer analysis, the material with good thermal conductivity contributes to the increase of solid accretion’s size and stable growth. Furthermore, the gas flow rates were varied to understand the effects on the solid accretion. It is found that in accordance with pressure change, the formation of accretion can be divided into three types: 1. the pressure is stable and the size of solid accretion depends on cooling capacity; 2. the pressure continues to increase and the gas flow is blocked by the solid accretion; 3. the pressure is oscillating and the solid accretion on the top of inner tube forms and disappears alternately. As a result, the pressure pattern curve with these three types can be a reference.
    Advisory Committee
  • Chien-Hsiung Tsai - chair
  • Yung-Chang Liu - co-chair
  • Chien-Chou Tseng - co-chair
  • Yu-Lun Huang - co-chair
  • Sheng-Yen Hsu - advisor
  • Files
  • etd-0619118-173605.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2018-07-20

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