Arcelormittal France

Arcelor France

Patrick Wetta

Marc Burty

Charles Pusse

Claude Bertoletti

Yves Borneque

Daniel Pernet

Francis Sulin

Eric Carioli

A method introducing a stirring gas through a vessel bottom, receiving a measurable mechanical vibration by at least one sensor fixed to the vessel or to a supporting frame thereof, filtering the thus detected vibration signals by a high pass filter and preferably by a low pass filter, sampling and digitizing the vibration signals for exposing them to a second filtering which is digital and calibrated upon the vessel vibration responses, sequencing the response, exposing each sequence to the calculation of a temporal moving mean square, and extracting the total effective value RMS (Root Mean Square) of the measured vibration signal therefrom. The effective value is used for controlling the stirring gas flowrate supplied to the vessel. The method can be used for a stirring stand of steel making shop ladles, converters, RH processes, electric arc furnaces, etc.

Method for controlling a molten metal bath bubbling in a metallurgical vessel and a device for carrying out said method

A device for control of bubbling of a metal bath in a ladle or in another similar metallurgical vessel including a bottom injector linked to a source of supply of pressurized stirring gas to be injected with aid of a pipe provided with a facility for adjusting flow rate, at least one vibration sensor mounted on the vessel itself or on a support frame, a signal processing unit processing a vibratory signal gathered by the sensor, and wherein the signal processing unit includes at least, and in successive order of processing of the vibratory signal, a high-pass analog filter, a digitizer, a digital filter calibrated on vibratory responses of the ladle, and a computer for computing a sliding temporal quadratic mean of RMS type.

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Saint Cyr sur Rhone, France

Patrick Wetta