RU1800356C - Device for continuous monitoring of oxidation of steel - Google Patents

Abstract

Usage: the invention relates to metallurgy and relates to devices for monitoring metallurgical processes. SUBSTANCE: device contains solid electrolyte, reference electrode, current collectors. The contact of the water-cooled rod with the controlled metal is carried out through a graphite-chamotte bushing, articulated by a cone-shaped connection with the body of the water-cooled rod, and the end of the water-cooled rod is closed by a ring 3 of refractory material. 2 tablets, 1 ill.

Description

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The invention relates to metallurgy and relates to devices for monitoring metallurgical processes.

The purpose of the invention is to increase the reliability of the device and reduce the error in determining the oxidation of steel.

This goal is achieved by the fact that in the device for continuous monitoring of the oxidation of steel, containing a solid electrolyte, a reference electrode, current collectors and a quartz case with refractory powder, mounted in a hollow water-cooled rod, which is a second current collector, a graphite-sheathed sleeve, articulated - by different connection with the body of the water-cooled rod, and the end of the water-cooled rod is closed by a ring of refractory material with an external diameter equal to the diameter of the end face of the water-cooled rod ..

The drawing shows a longitudinal section of the proposed device.

The device comprises a water-cooled rod 1, a chamotte bushing 2, a ring of refractory material 3, a quartz cover 4, magnesium oxide powder 5, a solid electrolyte cap 6, a reference electrode 7. a thermocouple 8 and an asbestos seal 9.

The device operates as follows.

Using a water-cooled rod 1, the device is immersed in the studied metal. Within 15-20 minutes after immersion, the quartz cover dissolves and the magnesium oxide powder is sintered to form a monolithic solid electrolyte.

 .As the reference electrode, fig. used a mixture of Mo + MoOa. Domestic

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the metal to be examined is removed by a graphite-fireclay bushing 2 and then fed through a water-cooled rod 1 to the measuring device, which eliminates the additional conductor from the current collector. The lower part of the graphite-chamotte bushing is located at a distance from the end of the water-cooled rod, where the metal temperature does not experience its cooling effect. Therefore, the formation of a freezing layer around the graphite-chamotte sleeve is excluded. In addition, a ring of refractory material isolates the end of the water-cooled rod from contact with liquid metal and, and having lower thermal conductivity than the material of the water-cooled rod, reduces heat transfer from the metal in the zone of the solid electrolyte, eliminates the temperature gradient along the height of the reference electrode, thereby reducing errors in determining the oxidation of metal.

The reliability of the device was evaluated during experimental swimming trunks.

 The reliability ratio was taken as the ratio of the number of valid measurements to the total number of used oxidation sensors (devices) during the study.

The results of industrial tests to assess the reliability of the prototype and the proposed device are presented in table. 1.

Table 2 Temperature gradient along the height of the reference electrode

The measurement is deemed suitable if reliable information is obtained about the oxidation of the metal under study.

The influence of the refractory ring on the elimination of the temperature gradient along the height of the reference electrode was carried out experimentally by measuring the temperature of the metal and the temperature of the upper layer of the reference electrode (Table 2).

The elimination of the temperature gradient reduces the error in determining the oxidation of the metal, that is, increases the accuracy, and, as a result, increases the reliability of the device.

Claims (1)

The claims A device for continuously monitoring the oxidation of steel containing a solid electrolyte, a reference electrode, current collectors and a quartz case with refractory powder, mounted in a hollow water-cooled rod, which is a second current collector, characterized in that, in order to increase reliability the operation of the device and reduce the error in determining the oxidation of steel, it contains a graphite-chamotte sleeve, articulated by a cone-shaped connection with the body of the water-cooled rod, and the end the water-cooled rod is closed by a ring of refractory material with an outer diameter equal to the diameter of the end face of the water-cooled rod. Table 1