Effect of Elliptical Snorkel on the Decarburization Rate in Single Snorkel Refining Furnace

Abstract

In the present work, physical model experiments were performed to investigate the effect of elliptical snorkel on the decarburization in single snorkel refining furnace. A round snorkel with the same cross-section area as the elliptical snorkel was also made for comparison. Bubble behavior was recorded by a high speed video camera in this study. A volumetric mass transfer coefficient kA/V was used to evaluate the decarburization rate. Measurement of the volumetric mass transfer coefficient kA/V was made by means of the carbon dioxide desorption from a NaOH solution. It is found when the plug location is close to the center of the ladle bottom, almost all the bubbles get into the snorkels. However, when the plug location is too far away from the center of ladle bottom, bubbles will escape from the outside of the snorkel. kA/V generally rises with increasing gas flow rate. Moreover, kA/V is increased when the plug is moved from the center to the half radius of the ladle bottom. However, kA/V is decreased when the plug is moved from the half radius of ladle bottom to the ladle sidewall. It is indicated that kA/V for the elliptical snorkel is larger than that for the round one when the plug is located between the center and half radius of ladle bottom. Nevertheless, when the plug is located between the half radius and the ladle sidewall, the kA/V for the elliptical snorkel is smaller than that for the round one.

Simulation on Flow Field and Mixing Phenomenon in Single Snorkel Vacuum Degasser

“…In order to verify whether or not the present model can be applied on the actual plant system, since the plume Froude number similarity is significant in ladle metallurgy, a reduced 1/5 scale acrylic water modeling system has been developed to validate the mathematical model, considering geometric and dynamic similarity criteria based on Froude number in the system. The gas flow rate was determined based on the following equation, where Q mg , Q pg are the gas flow rates in the water model and real system, respectively, λ is the scale factor.…”

Numerical Simulation of Multiphase Flow and Mixing Behavior in an Industrial Single Snorkel Refining Furnace (SSRF): The Effect of Gas Injection Position and Snorkel Diameter

“…Aoki et al 14) studied REDA process by developing a cold model to compare the surface decarburization rate with RH, DH, and Tank. Qin et al and Rui et al 15,16) developed a physical model to investigate the effect of various design parameters on flow field and mixing phenomena, such as injection position, snorkel diameter, and submerged depth.…”

Numerical Simulation of Multiphase Flow and Mixing Behavior in an Industrial Single Snorkel Refining Furnace: Effect of Bubble Expansion and Snorkel Immersion Depth

“…The circulation rate and mixing time mainly depend on the structural and the operational parameters in the vacuum reactor. Owing to the limited application range of the SSRF, only a few researchers conducted the numerical simulation and water model to investigate the gas-liquid flow in SSRF or REDA during past decades, [11][12][13][14][15][16] as summarized in Table 1. In the previous numerical simulations, a single-averaged size of ascending bubbles was usually employed.…”