Modeling the effect of plug positions and ladle aspect ratio on hydrogen removal in the vacuum arc degasser

Faris Karouni, Bradley P. Wynne, Jesus Talamantes-Silva, Stephen Phillips

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The rate of hydrogen removal from molten steel in a vacuum arc degasser (VAD) is simulated using a three-phase (slag-argon-steel) Eulerian model. The time required to degas a 100 tonne melt from 5 to 1.5 ppm is predicted for a series of ladle aspect ratios and plug layouts. Compared to an axisymmetric single plug system, the degassing time can be reduced by 36% with the use of three equiangular plugs. Increasing the aspect ratio (AR) of the melt from 0.8–1.2 leads to an improvement in degassing performance, followed by a reduction in performance between AR = 1.2–1.6. A radial plug position of 0.5R is optimal for achieving low hydrogen levels in the melt. Reducing the inter-plug angle from θ = 180° (for double plug) and θ = 120° (for triple plug) to θ = 45° further reduces this time by 18 and 3.8%, respectively. The fastest rate of hydrogen removal is obtained through the use of three plugs at positioned at an angle of θ = 45° and plug radial position of 0.5R.

Original languageEnglish
Article number1700551
Number of pages8
JournalSteel Research International
Volume89
Issue number5
DOIs
Publication statusPublished - May 2018

Keywords

  • aspect ratio
  • degassing vacuum
  • eulerian
  • hydrogen
  • ladle
  • plug position

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