BE902892A - METHOD FOR MEASURING THE TEMPERATURE OF A METAL BATH IN A METALLURGICAL CONTAINER - Google Patents

Abstract

Method for measuring the temperature of a metal bath in a metallurgical container, in which at least one orifice is drilled through the metal casing and the refractory lining of said metal container, and the temperature of the metal bath is measured through said orifices, in particular optically.

Description

         

  Method for measuring the temperature of a metal bath in a metallurgical vessel.

  
The present invention relates to a method for measuring the temperature of a metal bath in a metallurgical vessel.

  
This method can be applied, in general, to the measurement of the temperature of any metal bath, ferrous or non-ferrous, contained in any metallurgical container, such as an oven or a ladle. As a simple illustration without any restrictive character, it will be described here in its application

  
to a steel bath in a converter.

  
The correct conduct of a pig iron refining operation requires the operator to know, as quickly and precisely as possible, the temperature of the metal bath. This knowledge allows him to interrupt the blowing of oxygen at the appropriate time to obtain the desired steel grade, particularly with regard to the carbon content.

  
The methods currently used, calling in particular on lost thermocouples thrown into the bath or on systems of the "sub-lance" type, do not always give entirely satisfactory results. Indeed, these measurements are made by the upper surface of the bath and they are therefore influenced by the layer of slag which must be crossed before reaching the molten metal. In addition, these measurements are very localized and they do not allow an image of the temperature field prevailing in the bath to be obtained at one or more determined moments of the ripening.

  
The present invention relates to a method making it possible to remedy these drawbacks.

  
The process which is the subject of the present invention is essentially characterized in that at least one orifice is drilled through the metal casing and the refractory lining of said metallurgical container, and in that the temperature is measured of the metal bath through the said orifices.

  
According to a first implementation of the invention, the temperature of the metal bath is measured by means of a pyrometer, for example a thermocouple, introduced by said orifice.

  
According to another implementation of the invention, the temperature of the metal bath is measured by means of an optical pyrometer

  
 <EMI ID = 1.1> Also according to the invention, a neutral gas, such as nitrogen or argon, is blown through said orifice in order to prevent the penetration of metal into the orifice.

  
According to another variant of the process of the invention, an optical fiber is introduced into said orifice and the temperature of the metal bath is measured by observing it through

  
the so-called optical fiber.

  
For the implementation of the method of the invention, the said orifice can be lined with a guide tube, which can be itself housed in a bar made of refractory material.

  
Such a modular type device allows easy replacement of the tube constituting the observation orifice, in the event of deterioration or obstruction thereof.

  
The method of the invention makes it possible to measure the temperature of a metal bath simultaneously at several points thereof; it suffices to provide an appropriate number of measurement orifices in the wall of the container, the said orifices being able to be formed both at the bottom and in the side wall of said container.

  
It is thus possible to detect heterogeneities of the bath, due for example to the presence of incompletely melted materials.

  
It goes without saying that the measurement of the temperature of the bath according to the invention can be carried out at any time, and if necessary continuously, during the operation of treating said bath.

  
Finally, the implementation of the method of the invention does not require

  
 <EMI ID = 2.1> deteriorate for example by crossing a too hard slag or by striking unmelted materials in the metal container-

  
lurgical.

  
Claims.

  
1. A method of measuring the temperature of a metal bath in a metallurgical container, characterized in that at least one orifice is drilled through the metal casing and the refractory lining of said metallurgical container, and in that the temperature of the metal bath is measured through said orifices.


      

Claims (1)

2. Method according to claim 1, characterized in that the temperature of the metal bath is measured by means of a pyrometer, for example a thermocouple, introduced into said orifice. 3. Method according to claim 1, characterized in that the temperature of the metal bath is measured by means of an optical pyrometer located at the outside outlet of said orifice. 4. Method according to either of claims 1 to 3, characterized in that a neutral gas, such as nitrogen or argon, is blown through said orifice. 5. Method according to claim 1, characterized in that an optical fiber is introduced into said orifice and in that the temperature of the metal bath is measured by observing it through said optical fiber.