Level measurements in metallurgical vessels

摘要

The vertical filling level of electrically conductive material in a cavity of a metallurgical vessel is measured by a system including a transmitting conductor for generating an electromagnetic field when connected to an alternating power source, and a receiving conductor which senses the electromagnetic field for generation of an output signal. The conductors are arranged inside a metal casing of the vessel to co-extend with a mutual spacing defining a spacing area that faces the cavity and extends along the periphery in an essentially closed loop. The mutual spacing is selected such that changes in the output signal is dominated by changes to the electromagnetic field caused by local changes in the amount of the conductive material adjacent the spacing. Part of the spacing area defines a vertical measurement region slanted along the periphery so as to diverge from the horizontal and vertical directions of the vessel.

主权项

1. A system for measuring a vertical filling level of electrically conductive material in a containment volume of a metallurgical vessel, the metallurgical vessel being defined by an outer metal casing that surrounds the containment volume and extends in a vertical direction, the system comprising:
a transmitting conductor for generating an electromagnetic field when connected to an alternating power source, a receiving conductor which is arranged to sense the electromagnetic field for generation of an output signal as a function of the vertical filling level, wherein the transmitting and receiving conductors are arranged inside the metal casing to co-extend with a mutual spacing to define a spacing area that faces the containment volume and extends along a periphery of the containment volume in a closed loop, wherein the mutual spacing is selected such that changes in the output signal is dominated by changes to the electromagnetic field caused by local changes in an amount of the conductive material adjacent to said spacing area, and wherein at least part of the spacing area defines a vertical measurement region in which the spacing area is slanted along the periphery so as to diverge from horizontal and vertical directions of the vessel.