Influence of Obstruction at Gas-Injection Nozzles (Number and Position) in RH Degasser Process

Influence of Obstruction at Gas-Injection Nozzles (Number and Position) in RH Degasser Process

One of the main problems that affects Ruhrstahl-Heraeus (RH) degasser circulation rate is the obstruction of the gas-injection nozzles. This study aims to elucidate the effects of obstructions in quantity and location using a physical model that depicts 16 injection nozzles on the up-leg distributed...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Vol. 50; no. 1; pp. 578 - 584
Main Authors: Trindade, Luis Carlos, Peixoto, Johne Jesus M., da Silva, Carlos Antônio, Baston, Eduardo Prado, Naves, Fabiano Luiz, Neto, Juan Canellas B., de Faria, David Tiago, Lofrano, Renata C. Z., França, Alexandre Bôscaro
Format: Journal Article
Language:English
Published: New York Springer US 15-02-2019
Springer Nature B.V
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Circulation
Computer simulation
DEGASSING
ENGINEERING
EXPERIMENTAL DATA
FLOW RATE
Flow velocity
GAS FLOW
GAS INJECTION
Materials Science
Metallic Materials
Nanotechnology
NOZZLES
Obstructions
Rings (mathematics)
SIMULATION
Structural Materials
Surfaces and Interfaces
SYMMETRY
Thin Films
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Summary:One of the main problems that affects Ruhrstahl-Heraeus (RH) degasser circulation rate is the obstruction of the gas-injection nozzles. This study aims to elucidate the effects of obstructions in quantity and location using a physical model that depicts 16 injection nozzles on the up-leg distributed symmetrically in 2 rings (8 nozzles/ring). We simulated six, symmetric and nonsymmetric, obstruction conditions to gas flow. The gas-flow rate was varied from 30 to 130 NL/min. The results for symmetric obstructions when the gas-flow rate is kept constant, indicates that the circulation rate in the equipment does not significantly change. However, when these obstructions are non-symmetric, the circulation rate varies drastically, even when the gas-flow rate is kept constant. The analysis of the experimental data generated from this study allowed to determine an equation for the circulation rate that takes into consideration the number and distribution of blocked nozzles.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-018-1474-6