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URN etd-0619118-174147
Author Zheng-Yhen Lin
Author's Email Address a0984013069@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 Numerical simulation and analysis of dust emission in steelmaking plant
Date of Defense 2018-07-09
Page Count 58
Keyword
  • numerical simulation
  • Dust collecting system
  • DPM
  • Dust escape
  • Electric arc furnace dust
  • Abstract Steelmaking is a polluting industry, and its process will produce a lot of smoke containing exhaust gas and heavy metal dust particles. If it is not properly handled, it will cause great harm to the environment. The most important recovery method is the dust collection system. Most of the polluting gases and toxic dust can be collected by a combination of dust collection and secondary dust collection. However, the dust collection system design of some steelmaking plants is not perfect. How much dust scattered outside the factory is one of the key tasks that need to be clarified.
    This study focuses on the establishment of a geometric model of the 3D EAF building to simulate exhaust gas and dust flow in the plant during the feeding and refining periods. In the study, a set of operating conditions will be fixed, and the effects of exhaust gas flow rate, secondary dust collection flow rate, and exhaust gas initial temperature on the total exhaust gas emission rate will be discussed separately, and transient trajectory particles will be used to describe the trajectories of metal dust particles.
    The results show that the secondary dust collection in the electric furnace plant is too far away from the furnace mouth. As the exhaust gas rises, it will mix with the cold air and cause the exhaust gas concentration to decrease, the dust collection efficiency is not high.
    In the case of feeding, the concentration of exhaust gas accumulated on the top of the plant will become higher, and the exhaust gas emission rate will be more than when the bucket is not poured. In addition, the dust will accumulate in the dust collecting hood. When the accumulation density is increased until the secondary dust collection cannot be instantaneously taken away, it will begin to spread around. Diffused dust will have a diameter particle size distribution in the factory due to different terminal speeds. Dust particles larger than 40μm will settle first, and dust particles smaller than 20μm will float on the top of the plant for the longest time. In operation condition, increasing the secondary dust collecting air volume can effectively improve the dust and exhaust gas emission.
    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-0619118-174147.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2018-07-21

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