In-furnace Conditions as Prerequisites for Proper Use and Design of Mud to Control Blast Furnace Taphole Length.

Tsuchiya, Nobuo; Fukutake, Tsuyoshi; Yamauchi, Yutaka; Matsumoto, Toshiyuki

doi:10.2355/isijinternational.38.116

Cited by 18 publications

(24 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…19) While, the existence of coke free space, very loose sate of packed coke particles with high void fraction, beneath the raceway is broadly suggested. 8,25,26) Conducting the experiments to trace the liquid flow with coke free space in furnace hearth peripheral, Nouchi et al 8) reported that the slag dripped in the central part firstly flows out to the nearest peripheral coke free space followed by traveling to tap hole along the circumference liquid flow through the coke free space. Combining above two, (1) liquid falls drops dominantly at furnace peripheral and (2) circumference liquid (slag) flow is running in furnace hearth peripheral, the hypothesized CLPW properties as well as its relatively large size obtained by calculation can be rationalized, the authors conclude.…”

Section: Calculation For Drainage Behavior With Clpwmentioning

confidence: 99%

Numerical Study on Metal/Slag Drainage Rate Deviation during Blast Furnace Tapping

Iida¹,

Ogura²,

Hakone³

2009

ISIJ Int.

View full text Add to dashboard Cite

Section: Calculation For Drainage Behavior With Clpwmentioning

confidence: 99%

Numerical Study on Metal/Slag Drainage Rate Deviation during Blast Furnace Tapping

Iida¹,

Ogura²,

Hakone³

2009

ISIJ Int.

View full text Add to dashboard Cite

“…In Ref.,26 where the state of the hearth of the actual furnace was characterized during relining, the authors noted a large build‐up below the taphole level. This skull could partly be formed by solidified taphole clay 12. A large skull reduces the heat variations in the lining, which could explain the poor agreement between the calculated and measured values.…”

Section: Resultsmentioning

confidence: 98%

“…Some related studies with relevance to the taphole region can be found in the literature. Tsuchiya et al12 studied how the taphole length could be increased by causing injected mud to sinter in the taphole region. Also, Nouchi et al13 have studied the solid flow and stress fields in the tap hole region using discrete element simulations.…”

Section: Introductionmentioning

confidence: 99%

Interpretation of Tap Induced Cyclic Temperatures in the Blast Furnace Lining

Swartling

Tilliander

Saxén

et al. 2012

steel research int.

View full text Add to dashboard Cite

The thermal behavior of the blast furnace hearth was studied using modeling. The focus was the effect of the size and shape of the taphole clay layer around the taphole. Four different cases have been calculated: one reference case and three cases with different taphole clay layer geometries. It was found that the calculated peak‐to‐peak amplitudes of the lining temperatures during the tap cycles at the location of a thermocouple can be approximated as a linear function of the taphole clay layer thicknesses for all calculated cases. Modeling was also done where both the 90th and the 10th percentile of the observed peak‐to‐peak values of the studied tap cycles were included to describe the behavior of the operating furnace. The taphole region can be divided into three categories based on how well the model can describe the measured process data: below, at, and above taphole level. Below the taphole level, the measured lining temperature variations are smaller than for the calculated results. At the taphole level, the model can describe the behavior well. Above the taphole level the measured lining temperature variations are larger than for the calculated results. It was concluded that in order to make a more accurate heat transfer model of the taphole region, the presence of a skull build‐up below the taphole, erosion above the taphole, and the bath level variations need to be taken into account.

show abstract

“…In this case, the taphole entry is lower relative to the liquid level in the hearth and hence it is less likely for the blast gas to be entrained into the taphole. Furthermore, Tsuchiya et al 4) pointed out that the extension of the taphole length can be achieved only when a holding space is in place behind the taphole, forming a stable "mushroom" (in the case of the built-in pedestal worn away). They also proposed that the development and stabilization of the clay "mushroom" can be improved by shortening the raceway above the tapholes, allowing the coke bed (deadman) to be closer to the back of the taphole.…”

Section: Implementation Of Results At Bf6mentioning

confidence: 99%

Flow Characteristics of a Blast Furnace Taphole Stream and Its Effects on Trough Refractory Wear.

Qian

Zulli

Tanzil³

et al. 2002

ISIJ International

View full text Add to dashboard Cite

An investigation consisting of plant trials and water modelling studies has been carried out with the aim of gaining a better understanding of flow characteristics of a blast furnace taphole stream and its effect on the trough refractory wear. It has been found that the entrainment of the blast gas into the taphole is the most likely root cause for splashy taphole stream, which is believed to greatly contributes to refractory wear on the trough in the region above the liquid level and on the trough cover. Based on the findings from the present studies, changes were made to furnace operation and casting practices at BHP Steel's Flat Products Division No. 6 Blast Furnace (BF6) to minimise splashy taphole streams. As a result, the refractory wear on the trough and its cover has been significantly reduced. The trough cover life of BF6 has been improved, from 60 000 to 300 000 tonnes of hot metal.

show abstract

In-furnace Conditions as Prerequisites for Proper Use and Design of Mud to Control Blast Furnace Taphole Length.

Cited by 18 publications

References 0 publications

Numerical Study on Metal/Slag Drainage Rate Deviation during Blast Furnace Tapping

Numerical Study on Metal/Slag Drainage Rate Deviation during Blast Furnace Tapping

Interpretation of Tap Induced Cyclic Temperatures in the Blast Furnace Lining

Flow Characteristics of a Blast Furnace Taphole Stream and Its Effects on Trough Refractory Wear.

Contact Info

Product

Resources

About