Patent ID: 7942950
Filing Date: 2011-05-17
Classification: C21C,F27D,G01N,Y02P

Abstract:
1. A method of vibratory control of bubbling of a metallic bath in a ladle, or in another similar metallurgical vessel, the method comprising: stirring the metallic bath by a stirring gas introduced through a porous plug of the ladle or vessel; gathering vibration signals, representative of a vibratory level to be measured, by at least one sensor placed on the ladle or vessel or on a frame of the ladle or vessel; processing the vibration signals by high-pass analog filters to remove frequencies associated with gravitation modes of the metallic mass to concentrate the whole of coding dynamics on useful components of the vibration signals representative of a bubbling phenomenon; sampling-digitizing the vibration signals by a digitizer, and, after the sampling-digitizing, filtering the vibration signals by a digital filter calibrated for vibratory responses specific to the ladle or vessel; sequencing successive digitized signals, and after the sequencing, subjecting each sequence to calculation of a sliding temporal quadratic mean from which is then extracted a global RMS effective value of the vibration signal thus measured, which effective value is used to adjust a flow rate of the stirring gas delivered to the ladle or vessel; analyzing a theoretical flow rate of the stirring gas from measurements of at least one of a pressure governor and a flow meter of the porous plug; and comparing a result of the analyzing with the effective value to determine a leak or obstruction of the porous plug.