Real-time blast furnace hearth liquid level monitoring system

Agrawal, Ashish; Kor, Swapnil C.; Nandy, Utpal; Choudhary, Abhik R.; Tripathi, Vineet Ranjan

doi:10.1080/03019233.2015.1127451

Cited by 31 publications

(17 citation statements)

References 7 publications

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“…In summary, the blast furnace tapping process is complicated and appropriate control of the draining process requires fundamental understanding of the underlying phenomena. 3,4) The outflows are driven by the in-furnace gauge pressure that balances the pressure drops induced by liquid flows through the deadman and taphole. As iron and slag drain…”

Section: Introductionmentioning

confidence: 99%

Off-line Model of Blast Furnace Liquid Levels

et al. 2018

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An off-line simulation model of the blast furnace hearth is developed based on mass balances for iron and slag, expression of the liquids outflow rates and logical conditions for the start and the end of the outflow of liquids. The dynamic model divides the furnace hearth into two regions of sizes that may change during the tapping process. It provides a description of the time evolution of the liquid levels and predicts the duration and the periods of iron-or slag-only flow in the beginning of the taps. The values of some model parameters are estimated on the basis of measurements in a reference blast furnace, while others are fixed. A sensitivity analysis of the model is provided, revealing the role of some key parameters. The model is demonstrated to describe the overall drainage behavior of the reference furnace reasonably well, and the presence of pools with different liquid levels can also be deduced from the real data. Finally, some recommendations for future work are suggested.

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Section: Introductionmentioning

confidence: 99%

Off-line Model of Blast Furnace Liquid Levels

et al. 2018

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“…However, very little information can be obtained from the lower part of the furnace due to a high throughput (mechanical wear), a hostile environment (corrosive melt, pressures exceeding 4 bar and temperatures in the order of 1500 °C), and difficult access (thick refractory‐lined walls). Therefore, the internal state of the hearth can only be reconstructed from measurements of the inputs and outputs at the furnace boundary . However, the large dimensions and the special working principle of the hearth with intermittent tappings where liquids flow through a coke bed (the deadman ) on their route to the taphole lead to spatial distributions of the variables.…”

Section: Introductionmentioning

confidence: 99%

On‐Line Estimation of Liquid Levels in the Blast Furnace Hearth

Roche

Helle

Stel

et al. 2018

steel research int.

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An on-line model of the liquid levels in the blast furnace hearth is developed based on mass balances, estimates of the production rates, and measurements of the outflow rates of iron and slag. To consider differences arising in the hearth when different tapholes are operated, the hearth is divided into m regions, characterized by individual iron and slag levels. The pools communicate with each other by cross-flow of iron and slag. To prevent drift in the liquid level estimates, a correction procedure is developed to make the levels stay within reasonable bounds. The model is applied to measurement data from a three-taphole blast furnace and is demonstrated to provide an on-line view of the in-furnace conditions. The liquid level estimates as well as the required corrections are illustrated and analyzed for cases with different model parameters, and an explanation of the required corrections is provided. The model is also evaluated with respect to its ability to predict the end of the taps. Finally, conclusions concerning the validity of the model are drawn and possible future developments of it are outlined.

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“…The blast furnace is still the main section in an integrated steel company and its production and efficiency determines the costs and profits of the company. However, a blast furnace is a typical black box in which many phenomena cannot be directly observed and measured, such as the liquid level of hot metal and slag in hearth, the extent of lining erosion and location of dead man in hearth [1][2][3][4]. These phenomena not only influence a smooth operation of hot metal tapping practice but also determine stabilities of blast furnace productivity and a long time campaign [5].…”

Section: Introductionmentioning

confidence: 99%

Monitoring Liquid Level of Blast Furnace Hearth and Torpedo Ladle by Electromotive Force Signal

Liu

Zan

et al. 2018

Metals

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The state of a blast furnace hearth, especially the liquid level of hot metal and slag during the tapping process, is of crucial importance with respect to a long campaign blast furnace. In practice, the state of the hearth is evaluated mainly by the experience of operators. In this paper, the electromotive force (EMF) is used to monitor the liquid level of a laboratory scale of blast furnace hearth and the effect of liquid level, EMF sensors position and the thickness of refractory on EMF signals are tested using a single layer of water and double layers of water and oil. After laboratory experiments, the electromotive force (EMF) is used to monitor the liquid level of torpedo ladle successfully. Laboratory experimental results show that the change in liquid level can be characterized by EMF signal. The state of liquid surface and local thermal state cause the EMF signal to vary in the circumferential direction of the vessel. Furthermore, the EMF signal magnitude decreases with the decrease of the thickness of the graphite crucible. Finally, the main conclusions of the laboratory experiment are supported by the torpedo ladle experiment.

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Real-time blast furnace hearth liquid level monitoring system

Cited by 31 publications

References 7 publications

Off-line Model of Blast Furnace Liquid Levels

Off-line Model of Blast Furnace Liquid Levels

On‐Line Estimation of Liquid Levels in the Blast Furnace Hearth

Monitoring Liquid Level of Blast Furnace Hearth and Torpedo Ladle by Electromotive Force Signal

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