JPS6367505A - Sensor for wear quantity of refractory body - Google Patents

Abstract

PURPOSE:To detect the wear quantity of a refractory body with high accuracy by connecting electric resistance elements in parallel and arranging them along the progressive direction of the wear of the refractory body and then measuring resistance variation when the electric resistance elements are successively fused according to the wear quantity of the refractory body. CONSTITUTION:A couple of electric conductors 3a and 3b are buried lengthwise in parallel in an electric insulating lengthwise member 2 and a plurality of electric resistance elements R1-Rn are connected to those electric conductors 3a and 3b in parallel. This lengthwise member 2 is arranged in the progressive direction of the wear of the refractory body 8 provided inside a high temperature container. When the wear of the refractory body 8 advances, the lengthwise member 2 wears also in this direction. Then, the resistance elements buried in the lengthwise member 2 are successively fused from the tip part 1a and the parallel resistance value between terminals A and B varies. Accordingly, the resistance variation is detected by using an ammeter 7 and a power source 6 to detect the wear quantity of the refractory body 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sensor for detecting the amount of wear of a refractory in a high-temperature container lined with a refractory.

[Conventional technology] In the steelmaking process, various high-temperature equipment such as blast furnaces and converters are used. It is constructed by lining the inside of the frame or box with a relatively thick refractory layer. However, the refractory layer is repeatedly subjected to thermal and/or mechanical stimulation over a long period of time, and it is inevitable that it will gradually become brittle and eventually suffer damage such as falling off. It will be necessary to carry out temporary repairs or fundamental renovations. Therefore, accurately understanding the state of wear and tear on refractories (in other words, their remaining state) is an essential management item in order to continue safe operations.

The applicant has been researching and developing methods for determining the amount of wear on refractories for some time, and has already completed a high-precision detection sensor (Utility Model Publication No. 59-30399).
With the completion of this detection sensor, it has become possible to ascertain the amount of wear and tear on refractories with a fairly high degree of accuracy.

[Problems to be Solved by the Invention However, there are still some problems to be solved even with the above-mentioned technology. That is, the detection sensor has a configuration that requires two conductive wires each having a temperature-sensitive point at each measurement point (a plurality of measurement points are arranged in the longitudinal direction of the sensor), and therefore, the number of measurement points is n. When there are only 2n electrical wirings required, the wiring system becomes sloppy. Therefore, there is a limit to the measurement points that can be set within the sensor, and the detection sensor has the drawback that it can only measure the amount of wear on the refractory discontinuously.

As is clear from the above-mentioned purpose, an object of the present invention is to provide a sensor that does not make the wiring system complicated even when the number of measurement points is increased. The purpose is to provide a sensor that can detect the amount of wear and tear on objects.

[Means for Solving the Problems] The present invention, which has achieved the above object, is a method in which a pair of conductive wires are arranged in the longitudinal direction within an electrically insulating longitudinal member disposed along the direction of wear of the refractory. This refractory wear amount detection sensor is constructed in such a way that the conductive wires are buried in parallel and connected in parallel through a plurality of electrical resistance elements, and the current flowing through the conductive wires is measured.

[Function] The present invention is constructed as described above, but the key point is that electrical resistance elements are connected in parallel, and the resistance when the electrical resistance elements are sequentially blown out according to the amount of wear on the refractory. By detecting the amount of current change corresponding to the change, the amount of wear on the refractory can be detected with higher accuracy.

The present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic explanatory diagram showing the basic configuration of a refractory wear amount detection sensor (hereinafter simply referred to as a detection sensor) of the present invention, and FIG. 2 is a horizontal sectional view showing the usage status of the detection sensor. be. In the detection sensor 1 according to the present invention, as shown in FIG. 1, a pair of conductive wires 3a and 3b are installed in an electrically insulating longitudinal member (hereinafter simply referred to as the longitudinal member) 2 in the longitudinal direction (left and right in FIG. 1). direction), and the conductive wires 3a, 3b are provided with a plurality of electrical resistance elements R8°R2...
Ri...Rn (generally referred to as R) are sequentially connected in parallel from the tip 1a. and the conductive wire 3a
, 3b from a power source 6, and this current is detected by an ammeter 7. Such a detection sensor 1 (therefore, the longitudinal member 2) is, as shown in FIG.
A plurality of refractories are arranged in the circumferential direction or at the bottom of the high-temperature container along the direction of wear and tear of the refractory 8 (left-right direction in FIG. 2) with the tip 1a facing the inside of the high-temperature container (left side in FIG. 2). . In FIG. 2, reference numeral 10 is an iron shell. The material of the longitudinal member 2 is not limited in any way, but it may be the same material as the refractory 8 (limited to electrically insulating materials) or a material that wears out in the same way as the refractory wears. Any material is fine.

In the configuration shown in FIGS. 1 and 2, as the refractory wear progresses, the longitudinal member 2 also wears out along the wear progressing direction.

Then, a plurality of electric resistance elements R embedded in the longitudinal member 2 are sequentially fused from the tip end 1a side.

In 22, the total resistance R0 due to the electric resistance elements R is expressed by the following (Equation 11) when all the electric resistance elements R are in good condition.

Therefore, when the electrical resistance element R is sequentially (R1-*R2-eRn) from the tip 1a side of the longitudinal member 2 (exposed in the furnace due to melting of the sensor refractory and fused due to the influence of high heat), As this progresses, the total resistance R8 within the detection sensor 1 gradually increases. Then, by applying a constant voltage o to the power source 6 and measuring the current Io (Io = Vo /Ro), which decreases in response to the increase in the total resistance R0, using the ammeter 7, the wear amount of the longitudinal member 2 ( Therefore, the amount of wear and tear on the refractory 8 can be detected.

In the detection sensor 1 of the present invention, there are no limitations on the number and arrangement interval of the electrical resistance elements R;
It may be set as appropriate depending on the usage situation. Further, the resistance values can be changed individually as necessary. In any case, in the detection sensor 1 of the present invention, two conductive wires 3a and 3b are sufficient regardless of the number of electrical resistance elements R, resulting in a simpler electrical circuit, and an arbitrary number of detection points can be set. Therefore, the amount of wear on the refractory can be detected more continuously.

In the detection sensor 1 according to the present invention, as is clear from the above-described configuration, as the wear of the longitudinal member 2 progresses, the conductive wires 3a and 3b are sequentially exposed from the tip side (inside the high temperature container). It turns out. At this stage, conductive wire 3a
, 3b is sound without being fused, there is a good conductive material (for example, a steel bath in a converter) on the tip side.
If this exists, it is conceivable that the conductive wires 3a and 3b will be short-circuited on the tip portion 1a side, making it impossible for the detection sensor 1 to achieve its original function. If there is such a concern, use a low melting point substance for the conductive wires 3a, 3b, and connect the conductive wires 3a, 3 together with the electrical resistance element R near the tip surface where the temperature is high.
If b is made to fuse, it is possible to avoid a short circuit between the conductive wires 3a, 3b and the conductive material. In such cases, the low melting point substances used for the conductive wires 3a and 3b include:
For example, Pb-3n alloy can be mentioned. When the detection sensor 1 of the present invention is installed in a converter blowing nozzle, the tip of the nozzle is cut off from the steel bath by the bottom blowing gas, so the problem of short circuit does not occur.

[Example] Electric resistance element R (R1, R2, -Ri...Rn)
, 10 pieces with electrical resistance of 100Ω are placed at equal intervals (10
A buried detection sensor 1 (cm interval) is prepared, the detection sensor 1 is installed in a converter bottom blowing nozzle (Ar gas bottom blowing), a voltage of 50 V is applied between the conductive wires 3a and 3b, and electric current is applied. Six-sided longitudinal member 2 investigated for changes over time in the value of
The distance from the tip 1a to the electrical resistance element R1 was also set to 10 cm.

FIG. 3 shows the relationship between furnace life and current I0.

As shown in Figure 3, the current I0 changes in a step-like manner, which means that the wear and tear of the refractory has progressed to the position of the electrical resistance element R that corresponds to the point where the current I0 suddenly changes. It shows. Figure 4 shows the relationship between the furnace life and the amount of refractory wear at this time.

Note that the x mark in FIG. 4 indicates the amount of refractory wear measured by the conventional laser beam reflection method.

[Effects of the Invention] As described above, the present invention has been improved to have a relatively simple structure, and it has become possible to measure the amount of wear on refractories more continuously and with high precision.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram showing the basic configuration of the detection sensor 1 of the present invention, Fig. 2 is a horizontal sectional view showing the usage status of the detection sensor 1, and Fig. 3 shows the relationship between furnace life and current I0. The graph, FIG. 4, is a graph showing the relationship between furnace life and amount of refractory wear. 1...Detection sensor 2...Longitudinal members 3a, 3b
...Conducting wire 6...Power source 7...Ammeter
8... Refractory + n,,, a reason

Claims (1)

[Claims] A sensor for detecting the amount of wear on the refractory in a high-temperature container lined with a refractory, the sensor comprising a pair of conductive wires installed in an electrically insulating longitudinal member disposed along the direction in which the refractory wear progresses. A refractory wear detection sensor characterized in that the conductive wires are buried in parallel to each other, the conductive wires are connected in parallel through a plurality of electrical resistance elements, and the current flowing through the conductive wires is measured.