scholarly journals Experimental and Simulation Analysis of Physical Water Model through Tracer Injection under Various Baffles and Turbulence Inhibitor Conditions for Developing the Fluid Flow Parameters and Inclusion Removal Rates in Tundish

2021 ◽  
Vol 12 (5) ◽  
pp. 6361-6381
Keyword(s):  
Fluid Flow ◽  
Simulation Analysis ◽  
Removal Rate ◽  
Casting Process ◽  
Water Model ◽  
Removal Rates ◽  
Inclusion Removal ◽  
Ansys Fluent ◽  
Tracer Injection ◽  
Flow Parameters

Tundish is a critical part involved in the continuous casting process, which ensures the constant flow of liquid metal and with performing different functions. In odd-numbered multistrand tundish, the confirmation consistency of the fluid flow among all the strands is one of major concerns. In this study, five-strand tundish with a set of weirs and a baffle is utilized for investigation concerning fluid flow parameters and inclusion removal analysis. The simulation is carried out in ANSYS FLUENT 19.2 software through the defined numerical model, and the experimental analysis is performed on a scaled physical water model through tracer injection. Four different baffles are designed along with two different types of turbulence inhibiter for the tundish to enhance the fluid flow parameters and inclusion removal rates. The inclusion sizes were varied from 10 to 100 µm with a difference of 20 µm respectively for studying the inclusion removal rate concerning inclusion sizes. From the outcomes obtained like the residence time distribution (RTD) curves and others, it was concluded that the fourth baffle version with the first turbulence inhibiter, which are equipped in tundish version TV8 is the most beneficial tundish version for the enhancement in fluid flow and inclusion removal rates as compared to other tundish versions in this study.

Water Model on Fine Inclusion Removal by Bubble Flotation in RH Refining Process

2014 ◽  
Vol 528 ◽  
pp. 107-111 ◽  
Author(s):  
Chun Jie Yang ◽  
Fu Ping Tang ◽  
Tao He ◽  
Qiang Fu
Keyword(s):  
Gas Flow ◽  
Influence Factor ◽  
Treatment Time ◽  
Similarity Theory ◽  
Removal Rate ◽  
Water Model ◽  
Gas Flow Rate ◽  
Inclusion Removal ◽  
Vacuum Refining ◽  
Optimal Values

With the development of socio-economic and science and technology, People are more strict to the requirement of steel quality. A physical model was established according to the “similarity theory” to simulate the real 180t RH-TB vacuum refining device. Liquid steel is simulated by Nacl solution, Fine inclusions is simulated by high density polypropylene less than 0.04mm in diameter. The influence regularity of treatment time, lift gas flow rate and method of addition, the amount and time of NaHCO3 addition on the inclusions removal rate have been discussed, the optimal values for each influence factor have been found and can be used in optimizing the refining technology.

Tracer Injection Simulations and RTD Analysis for the Flow in 3-Strands Steelmaking Tundish

2017 ◽  
Vol 728 ◽  
pp. 72-77 ◽  
Author(s):  
Pruet Kowitwarangkul ◽  
Anawat Harnsihacacha
Keyword(s):  
Transport Model ◽  
Numerical Models ◽  
Flow Characteristics ◽  
Casting Process ◽  
Ansys Fluent ◽  
Tracer Injection ◽  
Current Design ◽  
Steel Cleanliness ◽  
Rtd Analysis ◽  
Steel Flow

Steel cleanliness in the continuous casting process can be improved by the enhancement of inclusion floatation via the flow control in tundish.The aim of this study is to define potential steel flow improvements in the 3-strands tundish of BSI (Bangkok Steel Industry) steelmaking shop. The numerical models of tundish without and with flow modifiers are simulated using the commercial computational fluid dynamics (CFD) software, ANSYS Fluent Workbench 14.0. The simulations of tracer injection using species transport model were performed. Flow characteristics were analyzed by RTD (residence time distribution) curves and the volumes fraction of three types of flow conditions. The results from this reseach shows how the current design of the flow modifiers improves some flow characteristics.

scholarly journals Fluid Flow Characterization of Single-Strand Tundish with Flow Modifiers through Physical Water Model (PWM) and CFD Simulation

2021 ◽  
Vol 12 (1) ◽  
pp. 211-221
Keyword(s):  
Fluid Flow ◽  
Residence Time ◽  
Cfd Simulation ◽  
Flow Behavior ◽  
Flow Characteristics ◽  
Steel Production ◽  
Single Strand ◽  
Experimental Simulation ◽  
Water Model ◽  
Inclusion Removal

The flow behavior in the continuous casting tundish dominates the quality and cleanliness of steel production. In this research, the single strand tundish's fluid flow behavior with different flow modifiers is investigated through numerical and experimental simulation. The numerical; simulation is performed in ANSYS FLUENT 19.2 (commercial package) and experimental through physical water model technique. The flow behaviors of bare tundish and tundish with three different flow modifiers are investigated. The three different flow modifiers deployed are the dam, baffle, and turbulence inhibiter (TI). Fluid flow performance is examined through residence time distribution (RTD) curves, which are derived from the measurement of the tracer concentration at the outlet. Good agreement between the CFD simulation and physical water model experiments is discovered. The results show there is an improvement in residence time and fluid flow (also improved inclusion removal) after the deployment of flow modifiers. There is a 20% improvement in peak and minimum residence time of RTD curves due to flow modifiers application. It is also discovered that the tundish configuration in this research, the tundish with turbulence inhibiter, provides optimal flow characteristics and eventually intended to promote a better level of inclusion removal.

Physical Simulation of Inclusions Removal in 180t RH Degasser

2013 ◽  
Vol 750-752 ◽  
pp. 375-379
Author(s):  
Chun Jie Yang ◽  
Fu Ping Tang ◽  
Tao He ◽  
Qiang Fu
Keyword(s):  
Gas Flow ◽  
Physical Simulation ◽  
Influence Factor ◽  
Removal Rate ◽  
Influence Factors ◽  
Water Model ◽  
Inclusion Removal ◽  
Vacuum Refining ◽  
Optimal Values ◽  
Additional Value

As one of the important refining equipments between steelmaking and continuous casting, RH vacuum refining plays an important role in removing the inclusions in the molten steel.RH can improve steel quality largely and meet the demand of mass production of high additional value. On the base of the similarity principle, a water model was developed to study the influence factors of inclusion removal in the molten steel of 180 tons RH vacuum refining device.Liquid steel is simulated by Nacl solution, the air is approximate argon, polypropylene simulate inclusions and NaHCO3 simulate composite particles. The influence regularity of lift gas flow rate, submersion depth of snorkels and the input amount of NaHCO3 on the inclusions removal rate have been discussed and the optimal values for each influence factor have been found.

Modeling Study of the Influence of Flow Control Devices on Metallurgical Effects in a Large-Capacity and Deep Bath Tundish

2011 ◽  
Vol 71-78 ◽  
pp. 4411-4415
Author(s):  
Jiao Li ◽  
Guang Hua Wen ◽  
Ping Tang ◽  
Ming Mei Zhu
Keyword(s):  
Fluid Flow ◽  
Flow Control ◽  
Steel Ingot ◽  
Casting Process ◽  
Field Pattern ◽  
Inclusion Removal ◽  
Large Capacity ◽  
Flow Control Devices ◽  
Macro Scale ◽  
Control Devices

Besides the function of molten steel supply in casting process, tundish has a capability of decreasing the formation of macro-scale inclusions and promoting the flotation of the remaining inclusions. So, the metallurgy worker has been concentrating on to elevation product cleanness by improving flow field pattern of steel liquid and increasing inclusion floatation efficiency. In this study, a large-capacity and deep bath tundish for Heavy Steel Ingot with different arrangement was compared by mathematical simulation and water modeling. The results show that with flow control, the tundish has an important effect on the fluid flow pattern and inclusion removal.

Significance of Mineralogical and Lithologic-Petrographical Rank in the Ranking of Geological Information

2020 ◽  
Vol 42 (4) ◽  
pp. 33-49
Author(s):  
O.V. CHEPIZHKO ◽  
V.V. YANKO ◽  
V.M. KADURIN ◽  
I.M. NAUMKO ◽  
S.M. SHATALIN
Keyword(s):  
Fluid Flow ◽  
Black Sea ◽  
Bottom Sediments ◽  
Oil And Gas ◽  
Sedimentary Cover ◽  
Geochemical Characteristics ◽  
The Black Sea ◽  
Flow Parameters ◽  
Geochemical Parameters ◽  
Geological Information

For the first time the importance of mineralogical and lithological-petrographical ranks in the line of geological information ranks is substantiated for implementation of long-term forecasts, standard and non-standard approaches to research of physical and geochemical parameters as a basis of creation of complex system of forecast criteria and prospecting indicators of hydrocarbons within the sedimentary cover of Black sea based on the theory of global fluid-flows derivation. These criteria have different sensitivity to the object (hydrocarbon deposits) and are therefore ranked. The ranking determined the following parameters: 1) seismic data within the object, obtained by the method of deep seismic sounding, RWM SDP; 2) parameters of tectono-geodynamic structures; 3) the main characteristics of sedimentary cover and bedrock; 4) geochemical characteristics; 5) parameters of mineral complexes and fluid inclusions in mineral neoformations; 6) the value of the distribution of meiobenthos. Based on modern views of oil and gas geology, structural-tectonic and lithological-facies criteria are among the main ones. The study of the mineralogical component of sediments is made with using mineralogical, thermobarogeochemical and X-ray spectral methods. Fixation of anomalies of fluid flow at the bottom of the Black Sea as to the distribution of abiotic parameters in order to assess the prospects of oil and gas is determined by structural and tectonic features and high permeability of fluid flow; parameters of mineral complexes (minerals, facies) and genetic connections; heterogeneity of geochemical characteristics of bottom sediments; the presence of hydrocarbon inclusions in authigenic minerals of bottom sediments.

Analysis of organic removal rates in the aerated submerged fixed film process

1998 ◽  
Vol 38 (8-9) ◽  
pp. 213-221 ◽  
Author(s):  
Mohamed F. Hamoda ◽  
Ibrahim A. Al-Ghusain
Keyword(s):  
Pilot Plant ◽  
Removal Rate ◽  
Domestic Wastewater ◽  
Removal Rates ◽  
Hydraulic Loading ◽  
Organic Removal ◽  
Wide Range ◽  
Fixed Film ◽  
Cod Removal Rate ◽  
And Performance

Performance data from a pilot-plant employing the four-stage aerated submerged fixed film (ASFF) process treating domestic wastewater were analyzed to examine the organic removal rates. The process has shown high BOD removal efficiencies (> 90%) over a wide range of hydraulic loading rates (0.04 to 0.68 m3/m2·d). It could also cope with high hydraulic and organic loadings with minimal loss in efficiency due to the large amount of immobilized biomass attained. The organic (BOD and COD) removal rate was influenced by the hydraulic loadings applied, but organic removal rates of up to 104 kg BOD/ m2·d were obtained at a hydraulic loading rate of 0.68 m3/m2·d. A Semi-empirical model for the bio-oxidation of organics in the ASFF process has been formulated and rate constants were calculated based on statistical analysis of pilot-plant data. The relationships obtained are very useful for analyzing the design and performance of the ASFF process and a variety of attached growth processes.

The comparison of trichloroethylene removal rates by methane- and aromatic-utilizing microorganisms

1998 ◽  
Vol 38 (7) ◽  
pp. 19-24 ◽  
Author(s):  
C.-J. Lu ◽  
C. M. Lee ◽  
M.-S. Chung
Keyword(s):  
Cell Concentration ◽  
Removal Rate ◽  
Carbon Sources ◽  
Batch Reactors ◽  
Initial Cell Concentration ◽  
Removal Rates ◽  
Initial Cell ◽  
Toluene Concentration ◽  
Cell Source ◽  
Removal Efficiencies

The comparison of TCE cometabolic removal by methane, toluene, and phenol utilizers was conducted with a series of batch reactors. Methane, toluene, or phenol enriched microorganisms were used as cell source. The initial cell concentration was about 107 cfu/mL. Methane, toluene, and phenol could be readily biodegraded resulting in the cometabolic removal of TCE. Among the three primary carbon sources studied, the presence of phenol provided the best cometabolic removal of TCE. When the concentration of carbon source was 3 mg-C/L, the initial TCE removal rates initiated by methane, toluene, and phenol utilizers were 1.5, 30, and 100 μg/L-hr, respectively. During the incubation period of 80 hours, TCE removal efficiencies were 26% and 96% with the presence of methane and toluene, respectively. However, it was 100% within 20 hours with the presence of phenol. For phenol utilizers, the initial TCE removal rates were about the same, when the phenol concentrations were 1.35, 2.7, and 4.5 mg/L. However, TCE removal was not proportional to the concentrations of phenol. TCE removal was hindered when the phenol concentration was higher than 4.5 mg/L because of the rapid depletion of dissolved oxygen. The presence of toluene also initiated cometabolic removal of TCE. The presence of toluene at 3 and 5 mg/L resulted in similar TCE removal. The initial TCE removal rate was about 95 μg/L-hr at toluene concentrations of 3 and 5 mg/L compared to 20 μg/L-hr at toluene concentration of 1 mg/L.

Relations between carbon removal rates, biofilm size and density of a novel anaerobic reactor: the inverse turbulent bed

2000 ◽  
Vol 41 (4-5) ◽  
pp. 253-260 ◽  
Author(s):  
P. Buffière ◽  
R. Moletta
Keyword(s):  
Removal Rate ◽  
Removal Rates ◽  
Carbon Removal ◽  
Biofilm Growth ◽  
Loading Rates ◽  
Biomass Activity ◽  
High Turbulence ◽  
The One ◽  
High Level ◽  
Very High

An anaerobic inverse turbulent bed, in which the biogas only ensures fluidisation of floating carrier particles, was investigated for carbon removal kinetics and for biofilm growth and detachment. The range of operation of the reactor was kept within 5 and 30 kgCOD· m−3· d−1, with Hydraulic Retention Times between 0.28 and 1 day. The carbon removal efficiency remained between 70 and 85%. Biofilm size were rather low (between 5 and 30 μm) while biofilm density reached very high values (over 80 kgVS· m−3). The biofilm size and density varied with increasing carbon removal rates with opposite trends; as biofilm size increases, its density decreases. On the one hand, biomass activity within the reactor was kept at a high level, (between 0.23 and 0.75 kgTOC· kgVS· d−1, i.e. between 0.6 and 1.85 kgCOD·kgVS · d−1).This result indicates that high turbulence and shear may favour growth of thin, dense and active biofilms. It is thus an interesting tool for biomass control. On the other hand, volatile solid detachment increases quasi linearly with carbon removal rate and the total amount of solid in the reactor levels off at high OLR. This means that detachment could be a limit of the process at higher organic loading rates.

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