JP2023064567A - Cu STAVE ABRASION DETECTION SENSOR - Google Patents

Abstract

To provide an abrasion detection sensor capable of accurately measuring progress of abrasion of a Cu stave over a long period of time even at a site where a temperature level is extremely high and a temperature fluctuation is sharp in a furnace.SOLUTION: An electric circuit 2 whose electrical characteristics are caused to change by damage and disconnection due to abrasion of a Cu stave is housed in a sensor body 3, a plurality of lead wire units 4 having detection lead wires 40 that cause the change in electrical characteristics are arranged so as to extend to different positions in a length direction of a tip side member 30 of the sensor body 3, and the detection lead wires are connected in series with resistors as detection elements constituting the electric circuit 2, and sets of each detection lead wire and each resistor are connected in parallel with each other. The tip side member 30 consists of a rod-shaped body made of Cu or Cu alloy solid material, a plurality of housing holes 33 are provided to individually house the lead wire units 4, and the lead wire units 4 are housed inside the housing holes 33.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a wear detection sensor that detects wear of a stave installed on the inner wall of a blast furnace.

Conventionally, as a method that can be easily measured even during operation of the blast furnace, the stave by contacting an ultrasonic probe to the end of the stave mounting bolt and detecting the length of the stave mounting bolt with ultrasonic waves A sensor that detects the wear of the stave (Patent Document 1), and a sensor that also applies ultrasonic waves to a marker embedded in the stave and detects the length of the marker from the reflection time, thereby detecting the wear of the stave (Patent Reference 2) has been proposed.

In addition, in the wear detection sensor that is inserted into the Cu stave installed on the inner wall of the blast furnace and detects the wear of the Cu stave, the wear and disconnection along with the wear of the Cu stave causes electrical property changes. A circuit is built inside a metal tube that constitutes the outer wall of the sensor, and as a detection lead wire that constitutes the electric circuit and causes the change in electrical characteristics, the length at the tip side portion where wear is expected with the Cu stave A plurality of detection lead wires extending to different positions in the longitudinal direction are arranged, and each detection lead wire extends to a position on the base end side outside the furnace in the metal tube, and constitutes the electric circuit on the base end side. After a resistor is connected in series as a detection element, each detection lead wire and a set of resistors are connected in parallel with each other, and the Cu stave wears according to the change in the combined resistance value of the parallel-connected electric circuit. is also proposed (see Patent Document 3).

JP-A-61-264110 JP-A-63-73088 JP 2020-164996 A

As shown in Patent Documents 1 and 2, when the length of the stave mounting bolt or marker is measured by ultrasonic waves, the temperature of the bolt / marker at the time of measurement, the bolt / marker and the stave or the probe of ultrasonic measurement There was a problem that the measurement error increased depending on the contact situation with the child, the accumulation situation on the inner surface of the stave, etc., and there was a limit to the improvement of accuracy.

On the other hand, in the Cu stave wear detection sensor disclosed in Patent Document 3, even during the operation of the blast furnace, the built-in electric circuit wears and breaks along with the wear of the Cu stave, thereby synthesizing a parallel circuit. By looking at the change in resistance value, the wear of the Cu stave installed on the inner wall of the blast furnace can be detected accurately and efficiently, and one circuit can capture these multiple resistance value changes. In addition, since the detection lead wire that constitutes the electric circuit and causes the resistance value change is arranged inside the tip side portion that is expected to be worn along with the Cu stave, reliable detection based on the disconnection of the detection lead wire A wear condition is detected, and highly accurate detection is possible.

Moreover, since the detection conducting wire extends to the base end side of the metal tube outside the furnace, and the resistor is connected in series as a detection element constituting the electric circuit on the base end side, 400 Only the heat-resistant detection lead wire is placed on the tip side where the temperature is about ℃, and the detection element (resistor), which is not guaranteed to operate at a high temperature of 200℃ or higher, is placed in the low temperature part outside the furnace. , it is possible to ensure the accuracy of the sensor for a long period of ten years or more.

In the Cu stave wear detection sensor disclosed in the above-mentioned Patent Document 3, a Cu or Cu alloy protective tube is provided at the tip side portion of the wear detection sensor, and a detection lead wire for detecting the progress of wear is provided in this protective tube. In addition to being arranged in a predetermined number and in each predetermined position, the gap inside the protective tube is filled with heat-resistant cement, MgO fine powder, etc., which has heat resistance, sealing properties, and insulation as a filler, and the sensor It can be used without any problem under normal operating conditions of a blast furnace where the tip temperature is 400° C. or less. However, in the case of a blast furnace operated with high production, high oxygen enrichment, and high PCR (high pulverized coal injection ratio), the temperature at the tip of the sensor frequently rises to a high temperature of, for example, 800°C or higher for a long period of time. As a result, premature damage to the filling material and exposure of the sensing wire to the hot gas within the furnace is inevitable. As a result, erroneous detection due to wear and disconnection of the detection lead wire before the Cu stave and the sensor tip protection tube wear, that is, the wear of the Cu stave has not reached the detection point of the sensor. It was confirmed that erroneous detection occurs when it occurs.

In particular, in a large-diameter wear detection sensor with a tip protection tube having an outer diameter of, for example, 20 mm or more, the cooling effect due to heat conduction from the Cu stave is likely to be insufficient, so deterioration and damage of the filler become noticeable. There is a tendency that the accuracy of measuring the wear of the Cu stave tends to decrease. That is, the filler located inside the furnace of the tip protection tube is gradually damaged and peeled off from the surface side, and the inside of the tip protection tube is exposed to the high-temperature gas in the furnace containing alkaline components such as Na and Zn. However, if a sudden temperature change occurs, the coating of the detection lead wire inside the tip protection tube is damaged, and the furnace contents made of Fe powder, C powder, etc. come into contact with multiple damage detection lead wires, It becomes difficult to maintain the insulation of the conductor. As a result, it was found that the electrical characteristics of the detection circuit fluctuated, causing apparent wear progress due to early damage to the filling material in the tip protection tube.

Therefore, in view of the above-mentioned situation, what the present invention aims to solve is that even in the lower part of the shaft to the belly of the blast furnace, where the temperature level in the furnace is extremely high and the temperature fluctuates rapidly, the progress of wear of the Cu stave is prevented for a long period of time. The object is to provide a wear detection sensor capable of measuring with high precision over a range of temperatures.

The present invention includes the following inventions.

(1) A blast furnace Cu stave wear detection sensor that is inserted into a Cu stave installed on the inner wall of a blast furnace and detects wear of the Cu stave, and is worn or disconnected as the Cu stave wears. The electric circuit that causes the change in electrical characteristics is housed in the sensor body, and a plurality of conductor units having detection conductors that constitute the electric circuit and cause the change in the electrical characteristics are expected to be worn together with the Cu stave. are arranged to extend to different positions in the length direction of the tip side member of the sensor main body, and the detection lead wires of the respective lead wire units extend to positions on the base end side outside the furnace in the sensor main body, A resistor is connected in series as a detection element constituting the electric circuit on the base end side, and a set of each detection lead wire and each resistor is connected in parallel with each other. At least the tip side member, which is expected to be worn together with the Cu stave, is made of a rod-shaped body made of Cu or Cu alloy solid material, and the tip side member has a plurality of accommodation holes for individually accommodating each of the conductor units. A wear detection sensor for a Cu stave of a blast furnace, wherein the lead wire unit is accommodated inside the accommodation hole and detects wear of the Cu stave by a change in the combined resistance value of the electric circuits connected in parallel.

(2) The Cu stave wear detection sensor for a blast furnace according to (1), wherein the electric circuit is connected to a data processing device via the detection element.

(3) The Cu stave wear detection sensor for blast furnace according to (1) or (2), wherein a temperature sensor is accommodated in the sensor main body.

According to the present invention, when the Cu stave is heated to a high temperature during operation of the blast furnace, the heat is transferred from the tip side member made of a rod-shaped solid material made of Cu or Cu alloy to each conducting wire unit having a detecting conducting wire. In contrast, the Cu stave and the tip side member of the sensor body are in a similar temperature distribution state, and when the Cu stave is worn, the tip side member of the sensor body is also worn almost at the same time. Therefore, before the Cu stave wears, the occurrence of erroneous detection due to the exposure of the detection lead wire to the high temperature gas in the furnace is effectively prevented, and the wear progress of the Cu stave can be accurately monitored over a long period of time. can be measured. In addition, even while the blast furnace is in operation, the electric circuit built into the tip side member of the sensor wears and breaks along with the wear of the Cu stave, and this changes the combined resistance value of the parallel circuit. It is possible to detect the wear of the Cu stave installed in the more accurately and efficiently, and it is possible to capture the resistance value change of these multiple times with one circuit. Thereby, the wear amount of the Cu stave for blast furnaces can be detected more accurately and continuously as one circuit.

In addition, since the detection lead wire that constitutes the electric circuit and causes the resistance value change is arranged inside the tip side member that is expected to be worn along with the Cu stave, the reliable wear situation based on the disconnection of the detection lead wire Detection is performed, and highly accurate detection is possible. Furthermore, since a plurality of detection conductors extending to different positions in the length direction of the tip side member are arranged inside the tip side member, the wear of the Cu stave can be detected at a plurality of positions, and a more detailed wear situation can be grasped. Moreover, since the detection lead wire extends to the base end side of the metal tube outside the furnace, and the resistor is connected in series as a detection element constituting the electric circuit on the base end side, the high temperature Only a heat-resistant detection lead wire is placed on the tip side, and a detection element (resistor) that is not guaranteed to operate at a high temperature of 200 ° C or higher is generally placed in a low temperature part outside the furnace. It is also possible to ensure the accuracy of the sensor over a long period of years or more.

In addition, in the one in which the electric circuit is connected to a data processing device via a resistor as the detection element, it is possible to perform on-line wear management of the Cu stave for blast furnaces, and the height direction and circumference of the blast furnace By appropriately arranging multiple sensors at each position in the direction, it becomes possible to efficiently perform measurement and management of the entire blast furnace.

Furthermore, in the case where the temperature sensor is built in the sensor body, by measuring the temperature status of the Cu stave for blast furnace in addition to managing the wear status, more detailed information such as the relationship between the degree of wear progress and the temperature level can be obtained. In addition to being able to obtain the blast furnace status, it can be used as a replacement for the blast furnace Cu stave thermometer installed for the purpose of measuring the temperature of the conventional Cu stave. This is possible by designing with the same dimensions as the thermometer.

1 is a cross-sectional view showing a schematic configuration of a wear detection sensor according to an embodiment of the present invention; FIG. It is a sectional view showing the installation state of the wear detection sensor. 4 is a cross-sectional view showing a lead wire unit of the wear detection sensor; FIG. 4 is an image diagram showing an electric circuit of the wear detection sensor; FIG. FIG. 4 is an explanatory view of a main part showing a tip side member of the wear detection sensor; (a) It is a graph which shows the change of the combined resistance value in a pattern. (b) is a graph showing a change in combined resistance value in a pattern;

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 2 shows a blast furnace inner wall to which the wear detection sensor 1 according to the invention is mounted. The inner wall of the blast furnace includes a Cu stave 100 provided with a cooling water pipe 101, a castable (refractory aggregate) 102 disposed on the outer surface side, and a lining 103 made of an iron skin disposed on the outer surface side. It has An instrumentation guide tube 6 having an insertion portion 61 for the wear detection sensor 1 and a fitting flange 62 for attachment is welded and fixed to the lining 103 via a seal plate 63 .

The wear detection sensor 1 according to the present invention, as shown in FIGS. 1 and 5, is a sensor main body having a built-in electric circuit 2 that causes changes in electrical characteristics by wear and disconnection due to wear of the Cu stave 100. 3. A plurality of lead wire units 4 having detection lead wires 40 that constitute the electric circuit 2 and cause a change in its electrical characteristics are arranged on the tip side member 30 of the sensor main body 3 .

In addition, a mounting flange 11 fixed to the mounting flange 62 and a compression fitting 12 for fixing the mounting flange 11 to the sensor main body 3 are provided at substantially the central portion in the longitudinal direction of the sensor main body 3 . ing. Then, the mounting flange 11 is bolted to the mounting flange 62 of the instrumentation guide pipe 6, so that the tip side member 30 of the sensor main body 3 is inserted into the Cu stave 100 and fixed. ing.

As shown in FIG. 3, the wire unit 4 has a metal protective tube 41 made of Cu material, stainless steel, or the like, and a sealing body 42 that seals the tip portion. A detection lead wire 40 is disposed in the metal protection tube 41 so as to extend in the longitudinal direction thereof, and the detection lead wire 40 is folded near the tip of the metal protection tube 41, thereby A detection lead wire 40 is installed so as to extend from the base end side to the tip end side of the wear detection sensor 1 . In addition, the metal protective tube 41 is filled with a filler 43 made of a heat-resistant and insulating granular material such as MgO. is filled.

As described above, each detection lead wire 40 is stably held by arranging it in the metal protective tube 41, and the turn-back point located at each tip is accurately fixed. In addition, since the heat resistance and insulation of each detection lead wire 40 are maintained by the filler 43 made of MgO or the like arranged in the metal protection tube 41, short circuits and the like can be effectively prevented, and the detection It is possible to prevent the lead wire 40 from being damaged by being exposed to the hot gas in the furnace.

The tip side member 30 of the sensor main body 3 is made of the same material as the Cu stave 100, specifically, a rod-shaped body made of solid material made of Cu or Cu alloy. Such a tip end side member 30 has wearability comparable to that of the Cu stave 100, and when the Cu stave 100 wears, it wears integrally with it. For this reason, the detection lead wire 40 of the lead wire unit 4 housed inside the tip side member 30 is also worn at the same position as the worn surface of the Cu stave 100, causing a change in electrical characteristics due to disconnection of the detection lead wire 40, It is configured so that the wear of the Cu stave 100 can be detected with high accuracy. For the same reason, it is preferable to use the Cu stave 100 and the Cu stave 100 and Cu or Cu alloy conducting wire for the metal protective tube 41 and the detecting conducting wire 40 of the conducting wire unit 4 .

The tip side member 30 of the sensor main body 3 is provided with a plurality of accommodation holes 33 for individually accommodating the plurality of conductor units 4 by performing deep hole processing extending in the longitudinal direction. Each conductor unit 4 is configured to be accommodated inside the hole 33 . Further, by adjusting the hole depth of each accommodation hole 33, the tip positions (A1, A2, . It is

In the above-described configuration, when each conductor unit 4 is inserted into each accommodation hole 33, the folding points of the detection conductors 40 located on the tip side of each conductor unit 4 are located at different positions within the tip side member 30. are arranged. As a result, when the Cu stave 100 wears, wear and disconnection occur sequentially from the detection lead wire 40 located on the tip side of the sensor body 3, and the electrical characteristics of the electric circuit 2 change sequentially. In addition, by collecting the detection portions, which are the tip portions of the detection conducting wires 40, in the tip side member 30 of the sensor main body 3, it becomes possible to arrange many detection points.

Further, the length of the tip side member 30 is at least the range from the tip of the Cu stave 100 to the position corresponding to the inner peripheral surface of the inside of the furnace of the cooling water pipe 101 or more, so that the inside of the tip side member 30 It is preferable that the detection lead wire 40 of the lead wire unit 4 accommodated in the inner part is configured to detect the degree of wear in the area. That is, before the wear of the Cu stave 100 reaches the cooling water pipe 101, the degree of wear is detected and grasped, and the tip side so that it can be dealt with in advance before the cooling water pipe 101 is damaged and water leaks. Preferably, the length of member 30 is set.

As shown in FIGS. 1 and 4, the proximal end of each detection lead wire 40 constituting the electric circuit 2 is connected to the sensor through the distal end member 30 of the sensor main body 3 and the intermediate protective tube 31 located on the proximal end thereof. Extending to a portion located outside the furnace in the main body 3, inside the proximal side protective tube 32 located on the proximal side of the intermediate protective tube 31, each of the detection elements 21 similarly constituting the electric circuit 2 is connected to each detection element 21. there is That is, only the heat-resistant conductor unit 4 is arranged at the high-temperature portion located inside the furnace, and the detection element 21 is arranged at the low-temperature portion located outside the furnace. As a result, the detection element 21 is prevented from being affected by the temperature change occurring inside the furnace.

In the wear detection sensor 1 according to the present invention, as described above, the tip side member 30, which is expected to be worn together with at least the Cu stave 100 of the sensor body 3, is made of a solid rod made of Cu or Cu alloy, and the tip side The member 30 is provided with a plurality of housing holes 33 for individually housing the conductor units 4 , and the conductor units 4 are housed inside the housing holes 33 . For this reason, as in the prior art in which the metal protective tube provided at the tip of the wear detection sensor 1 is filled with a detection lead wire for detecting the progress of wear and a filler made of heat-resistant cement, MgO fine powder, etc., the sensor When the temperature of the tip portion frequently reaches a high temperature state of, for example, 800° C. or higher for a long period of time, the filling material is damaged early, and the detection lead wire is exposed to the high temperature gas in the furnace. It is possible to prevent erroneous detection caused by this.

That is, when the Cu stave 100 is heated to a high temperature during operation of the blast furnace, the heat is quickly transmitted to the tip side member 30 made of a rod-shaped body made of Cu or Cu alloy solid material, and both are at a similar temperature. Because of the distributed state, when the Cu stave 100 is worn, the tip side member 30 of the sensor body 3 is also worn substantially at the same time. Therefore, before the Cu stave 100 wears, the occurrence of erroneous detection due to the detection lead wire 40 being exposed in the furnace is effectively prevented, and the wear progress of the Cu stave 100 can be accurately monitored over a long period of time. can be measured. In addition, the heat of the Cu stave 100 is also transmitted more quickly to the conductor unit 4 in the tip member 30, and the Cu stave 100 and the conductor unit 4 are worn at approximately the same time, thereby further improving the detection accuracy. For this purpose, it is preferable that the peripheral surface of each conductor unit 4 is brought into close contact with the inner surface of the accommodation hole 33 .

As described above, the change in the electrical characteristics of the electric circuit 2 caused by the wear and disconnection of the detection lead wire 40 is assumed to be the change in the resistance value due to the disconnection of the detection lead wire 40 in this example. That is, according to the wear of the Cu stave 100, the detection lead wire 40 of the lead wire unit 4 built in the tip side member 30 is worn, and the resistance value changes due to the disconnection of the detection lead wire 40. , to detect the state of wear of the Cu stave 100 . In addition, for example, by determining the disconnection based on the presence or absence of conduction of the detection lead wire 40, the wear status of the Cu stave 100 is detected, or the thermocouple wire is used for the detection lead wire 40, and the electromotive force measurement is used to detect the disconnection. It may be one that detects the state of wear of the Cu stave 100 by determining.

In this embodiment, as shown in FIG. 4, as the detection element 21, the resistors 9 constituting the electric circuit 2 are connected in series to the base ends of the respective detection lead wires 40, and then each detection element 21 is connected in series. A pair of conductors 40 and resistors 9 are connected in parallel with each other, and are configured so that the combined resistance value can be measured by an external measuring instrument 91 . That is, in the present embodiment, the electric circuit 2 extends to different positions in the length direction in the tip side member 30 inserted into the Cu stave 100, and a plurality of detection conducting wires 40 that are sequentially disconnected along with the wear of the Cu stave 100. and a resistor 9 connected thereto are connected in parallel to form a parallel circuit. , the state of wear of the Cu stave 100 is grasped.

When the resistance value of the path composed of each detection lead wire 40 and the resistor 9 (resistance value of the resistor 9) is set to a constant value, the amount of wear of the tip side member 30 of the sensor main body 3 is small, and the number of disconnection paths is also small. In the initial stage of , the change in the combined resistance value becomes minute as described later, and high detection accuracy is required. On the other hand, the resistance value of the path (resistance value of the resistor 9) composed of each lead wire 40 for detection and the resistor 9 is set so that the change in the resistance value due to the disconnection of the path is always a constant amount of change (increase amount). In this case, the change in the combined resistance becomes constant as will be described later, and by connecting the electric circuit 2 to a data processing device, no special electric signal processing is required, and the state of wear and tear can be easily grasped visually at all times. It becomes possible to output as data.

For example, as shown in Table 1, the disconnection detection position of each detection lead wire 40 is arranged at intervals of 10 mm from the sensor tip for 10 paths, and the resistance value Ω of each path is calculated as (a) resistance for each disconnection (20 Ω, 60 Ω, 120 Ω . . . ), (b) set the resistance value of each path to a constant value (100 Ω), A combined resistance value was obtained when the conducting wire 40 was sequentially disconnected from the tip side (path 1) (Table 2).

FIG. 6 is a graph showing changes in combined resistance value Ω in pattern (a) shown in Table 2. In FIG. FIG. 7 is a graph showing changes in combined resistance value Ω in pattern (b) shown in Table 2. In FIG. The value Rk of the combined resistance value Ω when the detection lead wire 40 to the position Ak is disconnected according to the wear of the Cu stave is 1/{(1/Rk+1)+(1/Rk+2)+...+( 1/Rn)}.

In the graph in the case of pattern (a), as shown in FIG. 6, the amount of change (increase) in the combined resistance value Ω is always constant regardless of the progress of wear. On the other hand, in the graph for the pattern (b), as shown in FIG. 7, it can be seen that the amount of change in the combined resistance value Ω in the initial stage of wear is small. Considering a measuring instrument connected to the electric circuit 2, the pattern (b) requires high detection accuracy in order to measure a slight change in the combined resistance value Ω in the initial stage of wear. On the other hand, in the pattern (a), since the combined resistance value Ω changes at a constant rate in all stages of wear, it is possible to measure with a constant detection accuracy without excess or deficiency. As for the obtained data, in the case of pattern (a), since the amount of change is always constant, it is clear that it is easy to grasp the state of wear quantitatively.

Then, by simply connecting the electric circuit 2 in which the combined resistance value Ω changes to the measuring instrument 91 as an external data processing device, the wear condition of the Cu stave 100 can be determined without requiring special electric signal processing. Data that can be easily determined can be output. Such a measuring instrument 91 enables on-line management of the wear status of the Cu stave 100 . Further, if the signal output from the measuring instrument 91 is configured to be transmitted to a separately provided data processing device via a wired or wireless communication network, remote online monitoring becomes possible.

As shown in FIGS. 1, 4 and 5, the wear detection sensor 1 of this embodiment incorporates a temperature sensor 5 comprising a thermocouple 50 or the like. It may be extended and connected to an external measuring instrument 51 . It goes without saying that a temperature sensor other than a thermocouple can be used as the temperature sensor 5, and the temperature measurement position of the temperature sensor 5 can be arbitrarily set. The wear detection sensor 1 having such a temperature sensor 5 also has a function of measuring the temperature of the blast furnace, and is capable of grasping the relationship between the progress of wear of the Cu stave 100 and the temperature history.

If the wear detection sensor 1 with the temperature sensor 5 as described above is used, it is effective for blast furnace operation analysis and facility management. By setting, it becomes possible to replace the stave thermometer and use it, and it can be easily installed in the existing blast furnace. For example, in the case of a blast furnace in which an existing stave thermometer is installed in an installation hole with a diameter of 11 mm, by setting the outer diameter of the wear detection sensor 1 equipped with the temperature sensor 5 to about 10 mm, the blast furnace is in operation It is also possible to replace the existing stave thermometer with the wear detection sensor 1 with the temperature sensor 5 at the time of regular periodic inspection.

In addition, when designing a new Cu stave 100, for example, an installation hole with a diameter of 30 mm is provided in the Cu stave 100 of the blast furnace, and the installation hole has an outer diameter of about 29 mm. It is also possible to install the wear detection sensor 1 in which the wire unit 4 is arranged. By using the multi-point detection type wear detection sensor 1 in this way, the progress of wear of the Cu stave 100 can be detected easily and in detail.

By arranging a plurality of wear detection sensors 1 in the height direction and the circumferential direction of the blast furnace, they can also serve as a blast furnace operation and furnace body control sensor. The wear detection sensor 1 of the present invention makes it possible to accurately detect the progress of wear of the Cu stave installed on the inner wall of the blast furnace online for a long period of 20 years or more. It is suitable for controlling the furnace body (furnace belly, shaft lower part).

Although the embodiments of the present invention have been described above, the present invention is by no means limited to such embodiments, and can of course be embodied in various forms without departing from the gist of the present invention. In addition, the tip side member 30 of the wear detection sensor 1 according to the present invention can be applied as each wear detection sensor by using the same material FCD or cast steel to detect the wear of the FCD stave or cast steel liner. is also possible.

Reference Signs List 1 Wear detection sensor 2 Electric circuit 3 Sensor main body 5 Temperature sensor 6 Instrumentation guide tube 9 Resistor 11 Mounting flange 21 Detection element 30 Distal side member 31 Intermediate protection tube 32 Base end side protection tube 40 Lead wire for detection 50 Thermocouple 51 Measuring instrument 60 Compression fitting 62 Mating flange 91 Measuring instrument 100 Cu stave 101 Cooling water pipe 102 Castable 103 Steel shell

Claims (3)

A blast furnace Cu stave wear detection sensor that is inserted into a Cu stave installed on the inner wall of a blast furnace and detects wear of the Cu stave,
An electric circuit that causes a change in electrical characteristics due to wear and disconnection due to wear of the Cu stave is housed in the sensor body,
A plurality of lead wire units having a detection lead wire that constitutes the electric circuit and causes the change in electrical characteristics extend to different positions in the length direction of the tip side member of the sensor body, which is expected to be worn together with the Cu stave. distributed to
The detection lead wire of each lead wire unit extends to a position on the base end side outside the furnace in the sensor main body, and a resistor is connected in series as a detection element constituting the electric circuit on the base end side. In addition, each of the detection lead wires and each resistor set is connected in parallel with each other,
At least the tip side member of the sensor body, which is expected to wear out together with the Cu stave, is made of a rod-shaped solid material made of Cu or Cu alloy,
The distal end member is provided with a plurality of housing holes for individually housing the respective conductor units, and the conductor units are housed inside the housing holes,
Detecting wear of the Cu stave by a change in the combined resistance value of the electric circuit connected in parallel,
Blast furnace Cu stave wear detection sensor. the electrical circuit is connected to a data processing device via the sensing element;
The Cu stave wear detection sensor for a blast furnace according to claim 1. a temperature sensor is housed within the sensor body;
A wear detection sensor for a Cu stave of a blast furnace according to claim 1 or 2.

Images