Analysis on Liquid Flow in the Dripping Zone of Blast Furnace

Sugiyama, Takashi; Nakagawa, Tomoe; Sibaike, Hideharu; Oda, Yutaka

doi:10.2355/tetsutohagane1955.73.15_2044

Cited by 76 publications

(49 citation statements)

References 1 publication

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“…7. 4) By contrast, the resistance experienced by discrete liquid droplets/rivulets in the force-balance model has no means of propagating across the lower zone except indirectly via the gas flow field. Therefore, decreasing deadman permeability causes a local reduction in liquid velocity and, therefore, increase in holdup, but does not force liquid away from this region.…”

Section: Resultsmentioning

confidence: 99%

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Mathematical Modeling of Iron and Steel Making Processes. Modelling of Liquid Flow in the Blast Furnace. Application in a Comprehensive Blast Furnace Model.

Chew

Zulli

2001

ISIJ International

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In Part 1 of this report, the flows of molten iron and slag in the blast furnace were characterised using a 'force-balance' approach. In this paper, the incorporation of a molten iron and slag flow submodel into a comprehensive numerical model of the blast furnace is discussed. Liquids are generated from ore during descent through the cohesive zone and their flow calculated according to the prevailing gas, liquid and packing properties. Predicted information for molten iron and slag includes holdup, velocity, accumulation and flooding distributions, as well as areas of interaction between gas and liquid, and solid and liquid. Liquid flow is most strongly influenced by the radial variation in ore volume fraction entering the furnace, gas flow in the vicinity of the raceway and the furnace profile. Liquids, in turn, significantly increase the gas pressure gradient in the lower furnace. The flow of slag is more sensitive to operating conditions than molten iron.

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Section: Resultsmentioning

confidence: 99%

“…4) In potential flow, liquid at any point is influenced by the permeability distribution throughout the lower zone. Consequently, a decrease in deadman permeability, such as by decreasing the particle size, causes liquid to flow away from this region, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Mathematical Modeling of Iron and Steel Making Processes. Modelling of Liquid Flow in the Blast Furnace. Application in a Comprehensive Blast Furnace Model.

Chew

Zulli

2001

ISIJ International

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“…10) And, the whole composition of hold-up having particle diameter of 2.8 to 5 mm was obtained by chemical analysis. The viscosity of dripping slag was estimated by substituting the above-mentioned composition (to give an example, 4 components: CaO, SiO 2 , Al 2 O 3 and MgO) and a temperature assumed based on the hysteresis temperature of lump coke for a slag viscosity model 12) developed by Nakagawa et al Also, by substituting the above-mentioned composition for an analysis model 13) of non-metal inclusion composition made by Yamada et al, the melting point of dripping slag was estimated as a temperature at 100 % of liquid phase rate. Figure 2 shows the polarizing microscopic observation result of Ϫ1 mm fine of tuyere sample at a time when PCR was 171 kg/t (June 1998), from which it comes out that the population of slag in Ϫ1 mm fine indicates a lowering tendency toward the furnace center from the tuyere nose.…”

Section: Methods Of Investigationmentioning

confidence: 99%

“…For calculation, the slag temperature was supposed to be 2 000°C at a range of 1.5 m away from the tuyere nose, 1 550°C at a range of 1.5 to 2.5 m from the tuyere nose and 1 500°C at a range which is inner more than 2.5 m from the tuyere nose. Figures 14 and 15 show the viscosity of dripping slag and Ϫ1 mm fine estimated based on the viscosity model 12) developed by Nakagawa et al The viscosity of dripping slag indicates an increasing tendency with going away from the tuyere nose and it is 4 poise or thereabout maximally. When PCR is high, the increase in viscosity of dripping slag is hardly seen.…”

Section: Viscosity and Melting Point Of Dripping Slag Andmentioning

confidence: 99%

Behavior of Pulverized Coal Ash and Physical Properly of Dripping Slag under High Pulverized Coal Injection Operation.

Ichida

Orimoto

Tanaka³

et al. 2001

ISIJ International

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“…r (kg/m 3 ), g (N/m) and m (Ns/m 2 ) are the density, surface tension and viscosity of the liquid, respectively. In this study, parameters, such as density, 9,13) surface tension 9,12) and viscosity, [9][10][11] were formulated as a function of temperature, as shown in Appendix I. The calculated results for the particle diameter ('d') are shown in Fig.…”

Section: Theoretical Approach With Rayleigh's Andmentioning

confidence: 99%

Mechanism of the Formation of Slag Particles by the Rotary Cylinder Atomization

2010

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Slag is a potential resource of energy and materials because it contains a lot of elements and is at the high temperature of around 1 500°C when exhausted.In the previous study, we developed a rotary cylinder atomizing (RCLA) method that can efficiently use the rotation energy for atomizing the molten slag. The minimum diameter of the slag particle was from 10 to 50 % of the nozzle diameter. The obtained slag particles were amorphous spheres with high aspect ratios. The higher rotation speed and smaller nozzle diameter could make smaller particles. In the present study, the mechanism of slag particle formation from spouting slag string through the nozzle was investigated using the high-speed camera and the theoretical approach was performed.The slag was string-shaped when spouted from the nozzle. The relationship between the particle diameter (d) and nozzle diameter (2a) was derived as follows:Where r is density, L is the distance from the center of rotation to the tip of the slag string, Z is rotation speed and g is surface tension of slag.The flow rate of slag was evaluated using Hagen-Poiseuille's equation and the relationship between the particle diameter and the slag string diameter was obtained using Weber's equation. By comparison between the experimental and calculated results, we concluded that a string diameter of 0.2 mm for a 1.3 mm nozzle diameter was adequate in this experiment.KEY WORDS: mechanism of slag atomizing; slag recycle; amorphous slag; rotary cylinder atomizing.

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Analysis on Liquid Flow in the Dripping Zone of Blast Furnace

Cited by 76 publications

References 1 publication

Mathematical Modeling of Iron and Steel Making Processes. Modelling of Liquid Flow in the Blast Furnace. Application in a Comprehensive Blast Furnace Model.

Mathematical Modeling of Iron and Steel Making Processes. Modelling of Liquid Flow in the Blast Furnace. Application in a Comprehensive Blast Furnace Model.

Behavior of Pulverized Coal Ash and Physical Properly of Dripping Slag under High Pulverized Coal Injection Operation.

Mechanism of the Formation of Slag Particles by the Rotary Cylinder Atomization

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