Fluid Dynamics Analysis of Coherent Jet with a Mixed Shrouding H<sub>2</sub>-CO<sub>2</sub>/N<sub>2</sub> for EAF Steelmaking
In order to suppress the rapid combustion effect and consumption rate of pure hydrogen gas, N<sub data-eusoft-scrollable-element="1">2</sub> or CO<sub data-eusoft-scrollable-element="1">2</sub> at flow rates of 0, 80, and 240 Nm<sup data-eusoft-scrollab...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/3/291 |
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| Summary: | In order to suppress the rapid combustion effect and consumption rate of pure hydrogen gas, N<sub data-eusoft-scrollable-element="1">2</sub> or CO<sub data-eusoft-scrollable-element="1">2</sub> at flow rates of 0, 80, and 240 Nm<sup data-eusoft-scrollable-element="1">3</sup>/h was pre-mixed with shrouding H<sub data-eusoft-scrollable-element="1">2</sub> at flow rates of 800, 720, and 560 Nm<sup data-eusoft-scrollable-element="1">3</sup>/h at room temperature, and the behaviors of the main oxygen jet and shrouding flame were analyzed by both numerical simulation and combustion experiments. The results showed that, because of the participation of CO<sub data-eusoft-scrollable-element="1">2</sub> in the H<sub data-eusoft-scrollable-element="1">2</sub> combustion reaction, the length of the axial velocity potential core was reduced using the CO<sub data-eusoft-scrollable-element="1">2</sub> shrouding mixed injection method, compared to the same mixed rate of N<sub data-eusoft-scrollable-element="1">2</sub>. This trend would be further enhanced as N<sub data-eusoft-scrollable-element="1">2</sub> and CO<sub data-eusoft-scrollable-element="1">2</sub> mixing ratio increased. Meanwhile, when the shrouding mixed rate is 30%, the maximum axial and radial expansion rate generated by N<sub data-eusoft-scrollable-element="1">2</sub>-H<sub data-eusoft-scrollable-element="1">2</sub> shrouding method is 1.28 and 1.04 times longer than that by the CO<sub data-eusoft-scrollable-element="1">2</sub>-H<sub data-eusoft-scrollable-element="1">2</sub> shrouding method. The <i data-eusoft-scrollable-element="1">F<sub data-eusoft-scrollable-element="1">o-a</sub></i>, theoretical impaction depth and area generated by the 10% N<sub data-eusoft-scrollable-element="1">2</sub> shrouding mixed rate was 84.0, 95.5 and 86.4% of those generated by the traditional coherent jet, respectively, which indicated that the 10% N<sub data-eusoft-scrollable-element="1">2</sub> shrouding mixed rate method might lead to comparable production indexes in the EAF steelmaking process. |
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| ISSN: | 2075-4701 |