Cu Stave Wear Detection Sensor

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

[0001] The present invention relates to a wear detection sensor for detecting wear of a stave installed on the inner wall of a blast furnace.

Background Art

[0002] Conventionally, as a method that enables easy measurement even during blast furnace operation, a sensor (Patent Document 1) that detects wear of a stave by bringing an ultrasonic probe into contact with the end of a stave mounting bolt and detecting the length of the stave mounting bolt with ultrasonic waves, or a sensor (Patent Document 2) that applies ultrasonic waves to a marker embedded in a stave, detects the length of the marker from the reflection time, and thereby detects wear of the stave has been proposed.

[0003] Also, in a 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 an electrical characteristic change by wearing and breaking in accordance with wear of the Cu stave is built into the inside of a metal tube that constitutes the sensor outer wall, and as detection conductors that constitute the electric circuit and cause the electrical characteristic change, a plurality of detection conductors that extend to different positions in the length direction at the tip side portion where wear is expected together with the Cu stave are arranged, each detection conductor extends to a position on the base end side outside the furnace in the metal tube, a resistor is connected in series as a detection element that constitutes the electric circuit at the base end side, and a set of each detection conductor and resistor are connected in parallel to each other, and it has also been proposed to detect wear of the Cu stave according to a change in the combined resistance value of this parallel-connected electric circuit (see Patent Document 3).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] As disclosed in Patent Documents 1 and 2, in the method of measuring the length of the stay bolt or the marker by ultrasonic waves, measurement errors increase due to factors such as the temperature of the bolt / marker during measurement, the contact situation between the bolt / marker and the stay or the ultrasonic probe, and the deposition situation on the inner surface of the stay, resulting in limitations in improving accuracy.

[0006] On the other hand, in the Cu stay loss detection sensor disclosed in Patent Document 3, even during the operation of the blast furnace, the built-in electric circuit is damaged and disconnected in accordance with the loss of the Cu stay. By observing the change in the combined resistance value of the parallel circuit, the loss of the Cu stay installed on the inner wall of the blast furnace can be accurately and efficiently detected, and the change in these multiple resistance values can be captured by a single circuit. Further, since the detection wire that constitutes the electric circuit and causes a change in the resistance value is arranged inside the tip-side part that is scheduled to be lost together with the Cu stay, reliable detection of the loss situation based on the disconnection of this detection wire is performed, enabling high-precision detection.

[0007] Moreover, since the detection wire extends to the base end side, which is the position outside the furnace of the metal tube, and a resistor is connected in series as a detection element that constitutes the electric circuit at the base end side, only the heat-resistant detection wire is arranged at the tip side where the temperature is about 400°C, and the detection element (resistor), which is generally not guaranteed to operate at a temperature of 200°C or higher, is arranged in the low-temperature part outside the furnace, ensuring the accuracy of the sensor over a long period of 10 years or more.

[0008] In the Cu stave wear detection sensor disclosed in Patent Document 3 described above, a protective tube made of Cu or a Cu alloy is provided at the tip side portion of the wear detection sensor. A detection wire for detecting the progress of wear is arranged in this protective tube in a predetermined number and at predetermined positions respectively. The gaps inside the protective tube are filled with a heat-resistant cement, MgO fine powder, etc. that have heat resistance, sealing properties, and insulating properties. In the normal operation state of a blast furnace where the temperature at the tip of the sensor is 400°C or lower, it can be used without any problems. However, in the case of a blast furnace operating under high production, high oxygen enrichment, and high PCR (high pulverized coal injection ratio), the temperature at the tip of the sensor becomes a high-temperature state of, for example, 800°C or higher frequently and over a long period. As a result, the above-mentioned filling material is damaged early, and it is inevitable that the detection wire is exposed to the high-temperature gas in the furnace. As a result, it has been confirmed that false detection occurs due to wear and disconnection of the detection wire before the Cu stave and the tip protective tube of the sensor are worn, that is, false detection occurs that there is wear even though the wear of the Cu stave has not reached the detection point of the sensor.

[0009] In particular, in a large-diameter wear detection sensor with an outer diameter of the tip protective tube of, for example, 20 mm or more, the cooling effect due to heat conduction from the Cu stave tends to be insufficient, so the deterioration and damage of the filling material become prominent, and the accuracy of measuring the wear of the Cu stave tends to decrease. That is, when the filling material located on the furnace inner side of the tip protective tube is gradually damaged and peeled off from the surface side, and the inside of the tip protective tube is exposed to the high-temperature gas in the furnace containing alkali components such as Na and Zn, and rapid temperature fluctuations occur, the coating of the detection wire inside the tip protective tube is damaged, and the furnace charge composed of Fe powder, C powder, etc. comes into contact with a plurality of detection wires for damage detection, making it difficult to maintain the insulation state of the detection wire. As a result, it has been found that the electrical characteristics of the detection circuit fluctuate, and apparent wear progress, etc. caused by early damage of the filling material inside the tip protective tube occur.

Means for Solving the Problem

[0010] Therefore, in view of the above situation, the problem to be solved by the present invention is to provide a wear detection sensor that can accurately measure the progress of wear of the Cu stave over a long period even in the lower part of the shaft to the belly part of the blast furnace where the temperature level in the furnace is extremely high and the temperature fluctuation is intense.

[0011] The present invention includes the following inventions.

[0012] (1) A wear detection sensor for a Cu stave of a blast furnace 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 an electrical characteristic change by wearing and breaking due to wear of the Cu stave is housed in the sensor body. A plurality of conductor units having detection conductors that constitute the electric circuit and cause the electrical characteristic change are arranged so as to extend to different positions in the length direction of the tip side member of the sensor body whose wear is scheduled together with the Cu stave. The detection conductors of each conductor unit extend to a position on the base end side of the sensor body that is outside the furnace, and resistors are connected in series as detection elements that constitute the electric circuit at the base end side. Then, a set of each detection conductor and each resistor are connected in parallel with each other. At least the tip side member of the sensor body whose wear is scheduled together with the Cu stave is made of a solid rod of Cu or a Cu alloy material. The tip side member is provided with a plurality of accommodation holes for individually accommodating each conductor unit, and the conductor unit is accommodated inside the accommodation hole. A wear detection sensor for a Cu stave of a blast furnace that detects wear of the Cu stave based on a change in the combined resistance value of the electrically connected electric circuit.

[0013] (2) The wear detection sensor for a blast furnace Cu stave according to (1), wherein the electric circuit is connected to a data processing device via the detection element.

[0014] (3) The wear detection sensor for a blast furnace Cu stave according to (1) or (2), wherein a temperature sensor is housed in the sensor body.

Effects of the Invention

[0015] According to the present invention, when the Cu stave is heated to a high temperature during the operation of the blast furnace, the heat is quickly transmitted from the tip-side member made of a solid rod of Cu or Cu alloy to each wire unit having a detection wire, so that the Cu stave and the tip-side member of the sensor body have the same temperature distribution state. When the Cu stave is worn, the tip-side member of the sensor body is also worn substantially simultaneously. Therefore, before the Cu stave is worn, the occurrence of false detection caused by the detection wire being exposed to the high-temperature gas in the furnace is effectively prevented, and the progress of the wear of the Cu stave can be accurately measured over a long period. Also, even during the operation of the blast furnace, the electric circuit built into the tip-side member of the sensor is worn and disconnected in accordance with the wear of the Cu stave. By observing the change in the combined resistance value of the parallel circuit, the wear of the Cu stave installed on the inner wall of the blast furnace can be detected more accurately and efficiently, and the change in the resistance value of these multiple times can be captured by one circuit. As a result, the wear amount of the Cu stave for the blast furnace can be detected more accurately and continuously as one circuit.

[0016] Also, since the detection wire that constitutes the electric circuit and causes a change in the resistance value is arranged inside the tip-side member that is scheduled to be worn together with the Cu stave, a reliable detection of the wear situation based on the disconnection of the detection wire is performed, enabling high-precision detection. Furthermore, since a plurality of detection wires 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 grasp of the wear situation becomes possible. Moreover, since the detection wire extends to the base end side where the position outside the furnace of the metal tube is located, and a resistor is connected in series as a detection element that constitutes the electric circuit at the base end side, only a heat-resistant detection wire is arranged at the high-temperature tip side, and a detection element (resistor) that is not guaranteed to operate under a high temperature of generally 200 °C or more is arranged in the low-temperature part outside the furnace, making it possible to ensure the accuracy of the sensor over a long period of 20 years or more.

[0017] In addition, when the electric circuit is connected to the data processing device via a resistor as the detection element, it is possible to perform online wear management of the Cu stave for blast furnaces, and it is also possible to efficiently perform measurement and management of the entire blast furnace by appropriately arranging a plurality of sensors at each part in the height direction and circumferential direction of the blast furnace.

[0018] Furthermore, when a temperature sensor is built into the sensor body, in addition to managing the wear situation, by measuring the temperature situation of the Cu stave for blast furnaces, it is possible to obtain more detailed blast furnace situations such as the relationship between the degree of wear progress and the temperature level, and the operation as a replacement for the blast furnace Cu stave thermometer installed for the purpose of measuring the temperature of the conventional Cu stave becomes possible by designing the sensor body, mounting flange, etc. to have the same dimensions as the conventional blast furnace Cu stave thermometer.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0020] Next, embodiments of the present invention will be described in detail based on the accompanying drawings.

[0021] Figure 2 shows the inner wall of a blast furnace to which the wear detection sensor 1 according to the present invention is attached. This 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 thereof, and a lining 103 made of an iron skin disposed on the outer surface side thereof. In this lining 103, an instrumentation guide pipe 6 having an insertion portion 61 of the wear detection sensor 1 and a mounting flange 62 for mounting is welded and fixed via a seal plate 63.

[0022] As shown in FIGS. 1 and 5, the wear detection sensor 1 according to the present invention has a sensor body 3 incorporating an electric circuit 2 that causes an electrical characteristic change by wearing and breaking due to the wear of the Cu stave 100. A plurality of conductor units 4 having a detection conductor 40 that constitutes the electric circuit 2 and causes an electrical characteristic change thereof are arranged on the tip side member 30 of the sensor body 3.

[0023] Also, at a substantially central portion in the longitudinal direction of the sensor body 3, a mounting flange 11 fixed to the mounting flange 62 and a compression fitting 12 for fixing the mounting flange 11 to the sensor body 3 are provided. Then, the tip side member 30 of the sensor body 3 is fixed in a state of being inserted into the Cu stave 100 by, for example, bolting the mounting flange 11 to the mounting flange 62 of the instrumentation guide pipe 6.

[0024] As shown in FIG. 3, the conductor unit 4 has a metal protection pipe 41 made of Cu material, stainless steel, or the like, and a sealing body 42 that seals the tip portion thereof. Inside the metal protection pipe 41, the detection conductor 40 is disposed so as to extend in the length direction thereof, and the detection conductor 40 is folded back near the tip portion of the metal protection pipe 41, so that the detection conductor 40 is installed so as to extend from the base end side to the tip end side of the wear detection sensor 1. Further, the metal protection pipe 41 is filled with a filler 43 made of a granular material having heat resistance and insulation such as MgO, and the gap between the metal protection pipe 41 and the detection conductor 40 is filled with this filler 43.

[0025] As described above, each detection wire 40 is stably held by being disposed within the metal protective tube 41, and the folding points located at the respective tip portions are accurately fixed. Further, since the heat resistance and insulation of each detection wire 40 are maintained by the filler 43 made of MgO or the like disposed within the metal protective tube 41, short circuits and the like can be effectively prevented, and damage to the detection wire 40 due to exposure to the high-temperature gas in the furnace can be prevented.

[0026] The tip-side member 30 of the sensor body 3 is made of the same material as the Cu stub 100, specifically, a rod-shaped solid material made of Cu or a Cu alloy. Such a tip-side member 30 has the same degree of wearability as the Cu stub 100, and when wear occurs in the Cu stub 100, it wears integrally therewith. For this reason, the detection wire 40 of the wire unit 4 housed inside the tip-side member 30 also wears at the same position as the worn surface of the Cu stub 100, causing a change in electrical characteristics due to disconnection of the detection wire 40, and is configured to be able to accurately detect the wear of the Cu stub 100. For the same purpose, it is preferable to use a wire made of Cu or a Cu alloy of the same material as the Cu stub 100 for the metal protective tube 41 and the detection wire 40 of the wire unit 4.

[0027] The tip-side member 30 of the sensor body 3 is subjected to deep hole machining extending in its longitudinal direction, whereby a plurality of accommodation holes 33 for individually accommodating the plurality of wire units 4 are provided, and each wire unit 4 is configured to be accommodated inside each accommodation hole 33. Further, by adjusting the hole depth of each accommodation hole 33, the tip positions (A1, A2,...) of each accommodation hole 33, that is, the distances from the tip surface of the sensor body 3, are set to be different from each other.

[0028] In the above configuration, when each wire unit 4 is inserted into each accommodation hole 33, the folding points of the detection wires 40 located on the tip side of each wire unit 4 are arranged at different positions within the tip side member 30, respectively. As a result, when the Cu stub 100 is damaged, the detection wires 40 located on the tip side of the sensor body 3 are sequentially damaged and disconnected, and changes in electrical characteristics are sequentially caused in the electric circuit 2. In addition, by collecting the detection portions formed by the tip portions of the detection wires 40 within the tip side member 30 of the sensor body 3, it becomes possible to arrange a large number of detection points.

[0029] Further, by setting the length of the tip side member 30 to be equal to or greater than at least the range from the tip inside the furnace of the Cu stub 100 to the position corresponding to the inner peripheral surface inside the furnace of the cooling water pipe 101, it is preferable to configure the detection wire 40 of the wire unit 4 accommodated in the tip side member 30 to be able to detect the degree of wear in this range. That is, it is preferable to set the length of the tip side member 30 so that the degree of wear can be detected and grasped before the wear of the Cu stub 100 reaches the cooling water pipe 101, and prior measures can be taken before the cooling water pipe 101 is damaged and water leakage occurs.

[0030] As shown in FIGS. 1 and 4, the base end sides of the respective detection wires 40 constituting the electric circuit 2 extend through the tip side member 30 of the sensor body 3 and the intermediate protection tube 31 located on the base end side thereof to the portion located outside the furnace within the sensor body 3, and are respectively connected to the respective detection elements 21 also constituting the electric circuit 2 within the base end side protection tube 32 located on the base end side of the intermediate protection tube 31. That is, only the heat-resistant wire 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. This is configured to prevent the influence of the temperature change generated inside the furnace from reaching the detection element 21.

[0031] The loss detection sensor 1 according to the present invention is such that, as described above, the tip-side member 30, which is scheduled to be worn together with at least the Cu stub 100 of the sensor body 3, is made of a solid rod of Cu or a Cu alloy, and a plurality of accommodation holes 33 for individually accommodating each conductor unit 4 are provided in the tip-side member 30, and the conductor units 4 are respectively accommodated inside the accommodation holes 33. For this reason, unlike the prior art in which a detection conductor for detecting the progress of wear and a filler made of heat-resistant cement, MgO fine powder, etc. are filled in a metal protective tube provided at the tip portion of the wear detection sensor 1, when the temperature of the sensor tip portion becomes a high-temperature state of, for example, 800 °C or higher frequently and over a long period of time, the filler is not damaged early, and the detection conductor is not exposed to the high-temperature gas in the furnace, and the occurrence of false detection caused by this can be prevented.

[0032] That is, when the Cu stub 100 is heated to a high temperature during the operation of the blast furnace, the heat is rapidly transmitted to the tip-side member 30 made of a solid rod of Cu or a Cu alloy, and both have the same temperature distribution state. Therefore, when wear occurs in the Cu stub 100, wear also occurs in the tip-side member 30 of the sensor body 3 almost simultaneously. Therefore, before wear occurs in the Cu stub 100, the occurrence of false detection due to the detection conductor 40 being exposed in the furnace can be effectively prevented, and the progress of wear of the Cu stub 100 can be accurately measured over a long period of time. In addition, in order to further improve the detection accuracy by transmitting the heat of the Cu stub 100 to the conductor units 4 in the tip member 30 more rapidly and causing the Cu stub 100 and the conductor units 4 to be worn out almost simultaneously, it is preferable that the circumferential surface of each conductor unit 4 is in close contact with the inner surface of the accommodation hole 33.

[0033] As described above, the change in the electrical characteristics of the electric circuit 2 caused by the wear or disconnection of the detection lead wire 40 is regarded as a change in the resistance value due to the disconnection of the detection lead wire 40 in this example. That is, in response to the wear of the Cu staple 100, the detection lead wire 40 of the lead wire unit 4 incorporated in the tip-side member 30 wears out, and the resistance value changes when this detection lead wire 40 is disconnected. By utilizing this, the wear condition of the Cu staple 100 is detected. In addition, for example, the wear condition of the Cu staple 100 may be detected by determining disconnection based on the presence or absence of conduction of the detection lead wire 40, or by using a thermocouple wire for the detection lead wire 40 and determining disconnection by measuring the electromotive force, thereby detecting the wear condition of the Cu staple 100.

[0034] In the present embodiment, as shown in FIG. 4, as the detection element 21, resistors 9 that constitute the electric circuit 2 are respectively connected in series to the base end sides of the respective detection lead wires 40, and then the sets of the respective detection lead wires 40 and the resistors 9 are connected in parallel to each other 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 of the tip-side member 30 inserted into the Cu staple 100, and is composed of a parallel circuit in which each path composed of a plurality of detection lead wires 40 that sequentially break in accordance with the wear of the Cu staple 100 and the resistors 9 connected thereto are connected in parallel. By grasping the combined resistance value that increases step by step each time each path (detection lead wire 40) breaks, the wear condition of the Cu staple 100 is grasped.

[0035] When the resistance value of the path composed of each detection wire 40 and the resistor 9 (the resistance value of the resistor 9) is set to a constant value, in the initial stage of wear where the amount of wear of the tip-side member 30 of the sensor body 3 is small and the number of broken wire paths is also small, the change in the combined resistance value becomes minute as described later, and high detection accuracy is required. On the other hand, when the resistance value of the path composed of each detection wire 40 and the resistor 9 (the resistance value of the resistor 9) is set such that the change in the resistance value due to path disconnection always has a constant change amount (increase amount), the change in the combined resistance value becomes constant as described later. By connecting the electric circuit 2 to the data processing device, it is possible to output data that does not require special processing of electric signals and is easy to visually grasp the wear situation at all times.

[0036] For example, as shown in Table 1, the disconnection detection positions of each detection wire 40 are arranged at 10 mm intervals from the sensor tip for 10 paths, and the resistance values Ω of each path are set such that (a) the increase amount of the resistance value for each disconnection is constant (20 Ω, 60 Ω, 120 Ω...), (b) the resistance value of each path is constant (100 Ω), and the combined resistance value when the detection wire 40 is sequentially disconnected from the tip side (path 1) according to the wear situation from the sensor tip is obtained (Table 2).

[0037] Fig. 6 is a graph showing the change in the combined resistance value Ω in the pattern (a) shown in Table 2. Fig. 7 is a graph showing the change in the combined resistance value Ω in the pattern (b) shown in Table 2. The value Rk of the combined resistance value Ω when the detection wire 40 up to the position Ak is disconnected according to the wear of the Cu stabe is calculated by 1 / {(1 / Rk+1)+(1 / Rk+2)+···+(1 / Rn)}.

[0038]

Table 1

[0039]

Table 2

[0040] (a) In the graph for the case of the pattern, as shown in FIG. 6, regardless of the progress of wear, the change amount (increase amount) of the combined resistance value Ω always remains constant. On the other hand, in the graph for the case of (b) the pattern, as shown in FIG. 7, it can be seen that the change amount of the combined resistance value Ω in the initial stage of wear is slight. When considering the measuring instrument connected to the electric circuit 2, in the case of the (b) pattern, high detection accuracy is required to measure the slight change in the combined resistance value Ω in the initial stage of wear. In contrast, in the case of the (a) pattern, since the combined resistance value Ω changes at a constant rate throughout all stages of wear, it can be measured with a constant detection accuracy without overshoot or undershoot. Also, regarding the data obtained, in the case of the (a) pattern, since it always has a constant change amount, it is clear that it is easy to quantitatively grasp the wear situation.

[0041] And by simply connecting the electric circuit 2 in which the change in the combined resistance value Ω occurs to the measuring instrument 91 as an external data processing device, data that can easily determine the wear situation of the Cu stub 100 can be output without the need for special electric signal processing. With such a measuring instrument 91, online management of the wear situation of the Cu stub 100 is possible. Also, if the signal output by 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 is also possible.

[0042] Also, as shown in FIGS. 1, 4, and 5, the wear detection sensor 1 of this example may incorporate a temperature sensor 5 composed of a thermocouple 50 or the like, and this temperature sensor 5 may extend from the proximal end side of the sensor body 3 and be connected to an external measuring instrument 51. Needless to say, other than a thermocouple can be used as the temperature sensor 5, and the temperature measurement position of the temperature sensor 5 can also be arbitrarily set. The wear detection sensor 1 provided with such a temperature sensor 5 also has a temperature measurement function for a blast furnace, and it is also possible to grasp the relationship between the progress of wear of the Cu stub 100 and the temperature history.

[0043] If the wear detection sensor 1 with the temperature sensor 5 is used as described above, it is effective for the operation analysis and equipment management of the blast furnace. Moreover, by setting the outer dimensions of the sensor and the coupling flange for connection to the same size as the existing stave thermometer, it becomes possible to replace and use it with the existing stave thermometer, 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, even during the operation of the blast furnace, the wear detection sensor 1 with the temperature sensor 5 can be replaced and attached to the existing stave thermometer during normal periodic inspections etc.

[0044] When newly designing the Cu stave 100 etc., for example, an installation hole with a diameter of 30 mm is provided in the Cu stave 100 of the blast furnace, and a wear detection sensor 1 having an outer diameter of about 29 mm and equipped with the temperature sensor 5 and a large number (about 26) of wire units 4 is installed in this installation hole. By using such a 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.

[0045] By arranging a plurality of wear detection sensors 1 in the height direction and circumferential direction of the blast furnace, it can also be used as a blast furnace operation and furnace body management sensor. The wear detection sensor 1 of the present invention can accurately detect the progress of wear of the Cu stave installed on the inner wall of the blast furnace online over a long period of 20 years or more, and is suitable for the furnace body management of the parts related to the blast furnace life (morning glory part, hearth part, lower part of the shaft).

[0046] Although the embodiments of the present invention have been described above, the present invention is not limited to such examples at all, and it goes without saying that the present invention can be implemented in various forms without departing from the gist of the present invention. Further, by making the tip side member 30 of the wear detection sensor 1 according to the present invention of the same material FCD or cast steel as that for detecting the wear of the FCD stave or the cast steel liner, it is also possible to apply it as each wear detection sensor.

Explanation of symbols

[0047] 1 Loss detection sensor 2 Electric circuit 3 Sensor body 5 Temperature sensor 6 Instrumentation guide tube 9 Resistor 11 Mounting flange 21 Detection element 30 Tip-side member 31 Intermediate protection tube 32 Base-end side protection tube 40 Detection conducting wire 50 Thermocouple 51 Measuring instrument 60 Compression fitting 62 Mounting flange 91 Measuring instrument 100 Cu stub 101 Cooling water pipeline 102 Castable 103 Iron sheet

Claims

1. A Cu stave wear detection sensor for a blast furnace that is inserted into a Cu stave installed on the inner wall of the blast furnace and detects wear of the Cu stave, An electric circuit that causes an electrical characteristic change by wearing and breaking due to wear of the Cu stave is accommodated in the sensor body, A plurality of conductor units having detection conductors that constitute the electric circuit and cause the electrical characteristic change are arranged to extend to different positions in the length direction of the tip-side member of the sensor body that is scheduled to wear together with the Cu stave, The detection conductors of each conductor unit extend to a position on the base end side of the sensor body that is outside the furnace, and resistors are connected in series as detection elements that constitute the electric circuit at the base end side. And the sets of the respective detection conductors and the respective resistors are connected in parallel to each other, At least the tip-side member of the sensor body that is scheduled to wear together with the Cu stave is made of a rod-shaped solid material of Cu or a Cu alloy, The tip-side member is provided with a plurality of accommodation holes for individually accommodating the respective conductor units, and the conductor units are accommodated inside the accommodation holes, Detecting the wear of the Cu stave by the change in the combined resistance value of the electrically connected electric circuit, A Cu stave wear detection sensor for a blast furnace.

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

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

Images