In order to improve the vacuum refining efficiency of Ruhrstahl–Heraeus (RH), three new RH vacuum degassing vessels with arched snorkels were designed and the corresponding physical models were established. In the water simulation experiment, the circulation flow rate and mixing time of the RH with arched snorkels and rounded snorkels were researched from the aspects of snorkel shape, gas flow rate and the insertion depth of the snorkel. The results showed that, compared with conventional RH with rounded snorkels, the circulation flow rate of new RH reactors increased by 45%~218%, the mixing time decreased by more than 15%. When the maximum gas flow rate of RH with rounded snorkels reached, the circulation flow rate of the three RH with arched snorkels still increased linearly. Compared with the gas flow rate of traditional RH (60~130 m3/h), the maximum circulation flow rate of new RH reactor with arched snorkels increased by more than 48%, which would be convenient short-time and high-strength vacuum refining operation. For the three new type RH with arched snorkels, the circulation flow rate linear increased with the increase of gas flow rate and increased with the increase of immersion depth, and the mixing time decreased accordingly. In practical application, the immersion depth of two RH with relatively small arches should be greater than 545 mm, the immersion depth of RH with maximum arches should be greater than 818 mm, the maximum gas flow rate of three RH reactors with arched snorkels should be controlled at about 173 m3/h. Compared with a gas flow rate of traditional RH (60~130 m3/h), the circulation flow rate of 1#, 2# and 3# RH with arched snorkels increased about 100%, 42% and 112% respectively, mixing time reduced more than 30%, 15% and 34% respectively. In argon flow rate range of the experiment, the circulation flow rate of RH with unsymmetrical arched snorkels was the maximum, and its mixing time was the minimum.
Zhifeng REN Zhiguo LUO Zongshu ZOU
. Physical simulation on molten steel flow characteristics in the RH reactors with different arched snorkels[J]. The Chinese Journal of Process Engineering, 2020
, 20(1)
: 27
-34
.
DOI: 10.12034/j.issn.1009-606X.219171
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