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

Li Y, L Zan, Ge Y, H Wei, ZH Zhang, Bi CG, Lu KC, Yaowei Yu

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)


    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.
    Original languageUndefined/Unknown
    Pages (from-to)
    Number of pages13
    Issue number9
    Publication statusPublished - 2018
    MoE publication typeA1 Journal article-refereed


    • hearth
    • liquid level
    • thermal state
    • EMF

    Cite this