A Numerical Study on Dehydrogenation of Liquid Steel Supersaturated With Hydrogen in a Vacuum Degasser (VD)

Li, Mingming; Yang, Yu; Yu, Sophia; Shao, Lei; Zou, Zongshu

doi:10.1007/s11663-023-02796-3

Cited by 3 publications

(3 citation statements)

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“…Then, the dehydrogenation models in the VD were verified by comparing the predicted hydrogen content with the data under various operating conditions of the VD. In general, the results predicted by the current model showed reasonable agreement with the experimental data, as detailed in the recent study by the current authors [27].…”

Section: Continuity Equationsupporting

confidence: 89%

“…However, the current investigation is more focused on the dehydrogenation of the liquid steel with conventional low hydrogen levels (generally lower than 8 ppm), and it is still not yet clear whether the final hydrogen level in H-supersaturated liquid steel produced in an H-rich environment can be efficiently reduced to a desired level through the routine operation conditions of the vacuum-degassing apparatus. A recent study by Li et al [27] indicated that efficient removal of hydrogen from H-supersaturated liquid steel was not possible by using the routine operation conditions in the VD unit, unless the argon-purging rate was excessively increased; however, this would cause operation problems such as serious splashing, and thus further steps must be taken to efficiently remove hydrogen from H-supersaturated liquid steel produced in an H-rich environment. Therefore, optimizing the ladle design and process conditions is of prime necessity in ensuring that the hydrogen degassing of H-supersaturated liquid steel is cost-effective.…”

Section: { } [H]mentioning

confidence: 99%

“…In this mathematical model, hydrogen was removed through three routes, i.e., by the rising argon bubbles, the steel-free surface where the open-eye is located, and the bulk steel by nucleation near the bath surface, as shown in Figure 2a. A detailed model description for the dehydrogenation models via the three routes can be found in our recent study [27]. The solubility of atomized hydrogen in liquid steel was given by Sievert's law [29], as:…”

Section: Continuity Equationmentioning

confidence: 99%

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Efficiently Removing Hydrogen of H-Supersaturated Liquid Steel in the Vacuum Degasser with Various Gas Injection Modes

Dai

Yang

et al. 2023

Metals

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Hydrogen removal of H-supersaturated liquid steel produced in a hydrogen-rich environment in an industrial vacuum degasser (VD) is simulated here using a two-phase (argon–steel) Eulerian model. The dehydrogenation efficiency is evaluated for a series of ladle plug layouts and argon-purging modes. Increasing the plug number from the prototype double-plug of the ladle to four or slightly prolonging the degassing time of a triple-plug ladle enables to obtain the specified dehydrogenation efficiency and the end-point hydrogen level. Varying the plug position of the triple-plug ladle makes no significant difference in the dehydrogenation efficiency, which, however, is improved by adjusting the plug angle. For the triple-plug ladle, the non-uniform argon-purging mode improves the melt hydrodynamic conditions, but the optimal dehydrogenation performance is achieved in the uniform mode. The plug number has the greatest impact on the dehydrogenation efficiency compared to the other ladle designs considered. The high-efficiency dehydrogenation of H-supersaturated liquid steel in the VD can be achieved through using the quadruple plugs, or by using the triple plugs positioned at 0.57R, 0.57R, and 0.41R and the angles of 108.6° and 71.4°, with the uniform argon-purging flow rate.

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Section: Continuity Equationsupporting

confidence: 89%

Section: { } [H]mentioning

confidence: 99%

Section: Continuity Equationmentioning

confidence: 99%

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