Temperature measurement device and temperature measurement method

Abstract

An electromagnetic wave of a resonance frequency of a measuring device (11) is transmitted to the measuring device (11), the measuring device (11) is resonated, and the electromagnetic wave transmitted from the resonated measuring device (11) is received, the measuring device (11) is provided with a metal shell part (12) covering an internal space (14), and the shell part (12) is provided with a through hole (13) connecting the internal space (14) with the outside. A measurer (11) is installed inside a device that is a temperature measurement target, and changes the resonance frequency by expanding and contracting in accordance with the temperature. As a result, the temperature inside equipment such as a blast furnace is measured without damaging the equipment.

Description

Technical Field

[0001] The invention relates to a temperature measuring device and a temperature measuring method. Background Art

[0002] Generally, in a blast furnace operation, ores (lump ore, sintered ore, pellets, etc.) and coke as raw materials are alternately charged from the top of the blast furnace and deposited in layers.

[0003] The hot air blown in from the tuyere of the blast furnace gasifies and disappears the coke accumulated in the lower part of the blast furnace. In addition, the ore is reduced and melted by the reducing gas generated by the gasification of the coke. As a result, the raw materials in the blast furnace descend (fall), and the layer height decreases. In order to maintain the layer height at a certain height, ore and coke are alternately loaded from the top of the blast furnace.

[0004] Patent document 1 discloses "simulated particles having built-in RFID tags, which are loaded together with raw materials via a transport conveyor into a bell-less blast furnace having a distribution chute on the furnace top, and are used to grasp the loading status of the raw materials" ([Claim 1]).

[0005] Patent Document 2 discloses a "motion detection device for blast furnace charge that transmits and receives microwaves from the side of a blast furnace, obtains an image of the charge in the blast furnace, and measures the movement of the charge in the blast furnace" (Claim 1).

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: (Japanese) Patent Publication No. 2012-52151

[0009] Patent Document 2: (Japanese) Patent Publication No. 2008-13814 Summary of the invention

[0010] Technical problem to be solved by the invention

[0011] The temperature distribution in the blast furnace is useful information for understanding the progress of the reduction reaction.

[0012] However, the techniques disclosed in Patent Documents 1 and 2 are not techniques for measuring the internal temperature of equipment such as a blast furnace.

[0013] In order to measure the internal temperature of a device, it may be necessary to destroy a part of the device (for example, to make a hole), but in this case, the durability of the device may be reduced.

[0014] The present invention has been made in view of the above problems, and an object of the present invention is to measure the temperature inside a facility such as a blast furnace without destroying the facility.

[0015] Technical solutions for solving technical problems

[0016] The inventors of the present invention have conducted in-depth research and found that by adopting the following constitution, the above object can be achieved, thus completing the present invention.

[0017] That is, the present invention provides the following [1] to

[10] .

[0018] [1] A temperature measuring device, comprising: a measuring device, which has a metal shell portion covering the internal space and is a hollow body provided with a through hole connecting the internal space and the outside in the shell portion; a transmitting portion, which transmits electromagnetic waves of the resonance frequency of the measuring device to the measuring device to cause the measuring device to resonate; a receiving portion, which receives the electromagnetic waves transmitted from the measuring device that has resonated; the measuring device is installed inside a device to be measured for temperature, and the resonance frequency changes by expanding and contracting according to the temperature.

[0019] [2] The temperature measuring device according to the above [1], wherein the device is a furnace with raw materials installed inside.

[0020] [3] The temperature measuring device according to the above [2], wherein the furnace has an inlet for loading the raw materials into the inside of the furnace, and the transmitting portion is arranged at the inlet.

[0021] [4] The temperature measuring device according to the above [2] or [3], wherein the furnace is a blast furnace.

[0022] [5] A temperature measuring method, which uses the temperature measuring device described in the above [1] to measure the temperature inside the device.

[0023] [6] The temperature measuring method according to the above [5], wherein raw materials are loaded into the inside of the device, and the measuring device is loaded into the inside of the device together with the raw materials.

[0024] [7] The temperature measuring method according to the above [5] or [6], wherein the temperature inside the device is controlled based on the measured temperature.

[0025] [8] The temperature measuring method according to any one of the above [5] to [7], wherein the device is a furnace with raw materials installed inside.

[0026] [9] The temperature measuring device according to the above [8], wherein the furnace has an inlet for loading the raw materials into the inside of the furnace, and the transmitting portion is arranged at the inlet.

[0027]

[10] The temperature measuring method according to the above [8] or [9], wherein the furnace is a blast furnace.

[0028] Advantages of the Invention

[0029] According to the present invention, it is possible to measure the temperature inside a blast furnace or other equipment without damaging the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 FIG. is a schematic cross-sectional view showing a blast furnace.

[0031] Figure 2 FIG. is a schematic cross-sectional view showing a state in which a plurality of measuring devices are loaded into the blast furnace from the top (charging port) of the blast furnace.

[0032] Figure 3 FIG. is a magnified cross-sectional view showing a part of the blast furnace loaded with a plurality of measuring devices.

[0033] Figure 4 FIG. is a perspective view showing a part of the measuring device cut away.

[0034] Figure 5 FIG. is a graph showing the temperature characteristics of the resonance frequency of the measuring device.

[0035] Figure 6 FIG. is a perspective view showing a part of the measuring device with a cross-shaped through-hole cut away.

[0036] Figure 7 FIG. is a magnified cross-sectional view showing the blast furnace with a receiving part arranged inside.

[0037] Figure 8 FIG. is a magnified cross-sectional view showing another example of the blast furnace with a receiving part arranged inside. DETAILED DESCRIPTION OF THE INVENTION

[0038] Hereinafter, a temperature measuring device will be described based on the drawings. The following description also serves as a description of a temperature measuring method.

[0039] Figure 1 FIG. is a schematic cross-sectional view showing a blast furnace 1.

[0040] The blast furnace 1 is a device for obtaining molten iron 9 from iron ore (hereinafter also referred to as "ore").

[0041] The main body 2 of the blast furnace 1 is composed of iron sheet and refractory bricks.

[0042] Ore and coke as raw materials are alternately charged into the inside of the blast furnace 1 from the charging port 3 provided at the top of the blast furnace 1. The charging port 3 is a part for charging raw materials into the inside of the blast furnace 1. Sometimes it comes into temporary contact with the raw materials when charging the raw materials. However, in principle, during the operation of the blast furnace 1, it is a part where the raw materials do not come into contact. It should be noted that the charging port 3 of the blast furnace 1 is not actually open, but in Figure 1In [the figure], for convenience, an open charging port 3 is illustrated ( Figure 1 similarly illustrated for others as well). For example, a charging conveyor (not illustrated) is used for charging the raw materials.

[0043] The charged raw materials are stacked in layers inside the blast furnace 1. That is, the ore layer 5 and the coke layer 6 are stacked alternately.

[0044] At the lower part of the blast furnace 1, tuyeres 7 are provided. Hot air is blown into the inside of the blast furnace 1 from the tuyeres 7 and passes through the gaps (voids between the raw materials) of the ore layer 5 and the coke layer 6.

[0045] Through the hot air blown in from the tuyeres 7, the coke layer 6 is gasified. The ore layer 5 is reduced and melted by the reducing gas such as CO generated by the gasification of the coke layer 6.

[0046] Thereby, inside the blast furnace 1, the ore layer 5 and the coke layer 6 descend (fall). In order to maintain a constant height of the ore layer 5 and the coke layer 6, ore and coke are alternately charged from the top (charging port 3) of the blast furnace 1.

[0047] The ore layer 5 is reduced and melted, thereby producing hot metal 9. The produced hot metal 9 is discharged from the bottom of the blast furnace 1. The region where the ore layer 5 is completely melted is called the weld zone 8.

[0048] Inside the blast furnace 1, in order to produce hot metal 9, it is preferable to maintain a stable reduction reaction. The temperature distribution inside the blast furnace 1 is one of the useful information for grasping the progress of the reduction reaction.

[0049] However, since the inside of the blast furnace 1 is a high-temperature and high-pressure environment, it is difficult to install, for example, a temperature sensor (not illustrated) that is wired-connected to the outside of the blast furnace 1 inside the blast furnace 1.

[0050] In addition, when using a battery for the temperature sensor, it is difficult to measure temperatures exceeding the heat resistance limit of the battery.

[0051] Therefore, in the present embodiment, the measuring device 11 described below is charged from the top (charging port 3) of the blast furnace 1 into the inside.

[0052] Figure 2 is a cross-sectional view schematically showing a state in which a plurality of measuring devices 11 are charged from the top (charging port 3) of the blast furnace 1 into the inside. It should be noted that in Figure 2 in order to make the measuring device 11 easily visually recognizable, the size of the measuring device 11 is enlarged in the illustration.

[0053] Figure 3 is a cross-sectional view showing an enlarged part of the blast furnace 1 in which a plurality of measuring devices 11 are charged.

[0054] At the top (charging opening 3) of the blast furnace 1, there is a transmitting section 21 that transmits electromagnetic waves to the measuring device 11, and a receiving section 31 that receives the electromagnetic waves transmitted from the measuring device 11.

[0055] The transmitting section 21 is composed of various components such as a transmitting antenna and a transmitter. The receiving section 31 is composed of various components such as a receiving antenna and a receiver.

[0056] The components constituting the transmitting section 21 and the receiving section 31 can be different components or the same components. For example, as Figure 3 shown, the transmitting antenna and the receiving antenna can also be shared.

[0057] The electromagnetic wave irradiated from the transmitting section 21 to the measuring device 11 is preferably a microwave (an electric wave with a frequency of 300 MHz to 300 GHz).

[0058] Figure 4 is a perspective view showing a part of the measuring device 11 cut away.

[0059] The measuring device 11 is a hollow body. That is, the measuring device 11 has a metal shell portion 12 that covers the internal space 14. A through hole 13 that connects the internal space 14 to the outside is provided in the shell portion 12.

[0060] All objects have a frequency at which they tend to vibrate easily, called the natural frequency. If an external force (periodic force) corresponding to the natural frequency of the object is continuously applied to a stationary object, the object starts to vibrate and soon vibrates violently (the work done by the external force is effectively absorbed by the object, and the vibration of the object becomes intense). This phenomenon is called resonance. The natural frequency is also called the resonance frequency.

[0061] The measuring device 11 composed of the metal shell portion 12 has a resonance frequency.

[0062] The resonance frequency of the measuring device 11 is determined by, for example, the shape of the shell portion 12, the material of the shell portion 12, the thickness of the shell portion 12, the number of through holes 13, the position of the through holes 13, etc.

[0063] Electromagnetic waves such as microwaves are transmitted (irradiated) from the transmitting section 21 to the measuring device 11. The transmitting section 21 has a structure that can appropriately change the frequency of the transmitted electromagnetic wave. By transmitting an electromagnetic wave with the resonance frequency of the measuring device 11 from the transmitting section 21, the measuring device 11 resonates.

[0064] In the case where there is no through hole 13 in the shell portion 12 of the measuring device 11, the electromagnetic wave transmitted from the transmitting section 21 is easily totally reflected by the shell portion 12 (difficult to be absorbed).

[0065] However, since the shell portion 12 has a through hole 13, the electromagnetic wave transmitted from the transmitting section 21 is not totally reflected and is easily effectively absorbed. That is, the measuring device 11 (the shell portion 12) easily resonates.

[0066] Electromagnetic waves of the resonance frequency are transmitted from the resonator 11 that has resonated. The receiving unit 31 receives the electromagnetic waves of the resonance frequency transmitted from the resonator 11.

[0067] Since the housing 12 of the resonator 11 is made of metal, it expands and contracts according to temperature, and due to this expansion and contraction, the resonance frequency of the resonator 11 changes.

[0068] That is, the resonance frequency of the resonator 11 has a temperature characteristic.

[0069] Figure 5 It is a graph showing the temperature characteristic of the resonance frequency of the resonator 11.

[0070] More specifically, Figure 5 The graph of simulates the situation where electromagnetic waves are irradiated from a radar (not shown) to the resonator 11 at various temperatures, causing the frequency of the electromagnetic waves to change. It should be noted that since it is the simulation result when electromagnetic waves are irradiated to the resonator 11 from various angles, there are multiple graphs shown.

[0071] In Figure 5 In the graph, the horizontal axis represents the frequency (unit: GHz), and the vertical axis represents the RCS value (unit: dBsm). RCS (radar cross section) is a measure of the ability to reflect electromagnetic waves in the direction of the antenna when the antenna of the radar is irradiated with electromagnetic waves.

[0072] As Figure 5 As shown in the graph of, when electromagnetic waves of a specific frequency are irradiated, the RCS value of the resonator 11 changes significantly, that is, resonance occurs and a peak is observed. The peak position is different according to temperature. Specifically, the peak position shifts to the low-frequency side as the temperature increases.

[0073] From this, it can be known that the resonance frequency of the resonator 11 is different according to the temperature of the resonator 11.

[0074] Therefore, the resonator 11 transmits electromagnetic waves of a specific frequency at a specific temperature. Therefore, by receiving the electromagnetic waves transmitted from the resonator 11 by the receiving unit 31, the temperature of the resonator 11 can be determined. That is, the temperature inside the blast furnace 1 can be measured without damaging the main body 2 of the blast furnace 1.

[0075] The distance to the resonator 11 can be measured based on the time from when the electromagnetic waves are transmitted from the transmitting unit 21 until they are received by the receiving unit 31.

[0076] In addition, for example, a plurality of receiving units 31 are arranged at different positions in the circumferential direction at the top (charging port 3) of the blast furnace 1. By using the time difference until the electromagnetic waves transmitted from the measuring device 11 are received by the plurality of receiving units 31, the position of the measuring device 11 can be determined. In this way, the temperature distribution inside the blast furnace 1 can be grasped.

[0077] The measuring device 11 charged into the blast furnace 1 descends as the raw material falls (refer to Figure 2 ). According to the fall of the raw material, the temperature of each measuring device 11 is determined and collected in sequence.

[0078] Thereby, the temporal change of the temperature inside the blast furnace 1 can be grasped.

[0079] The temperature inside the blast furnace 1 can also be controlled based on the temperature inside the blast furnace 1 measured by the measuring device 11.

[0080] As a method for controlling the temperature, there is no particular limitation, and examples include a method of adjusting the charging amount of the raw material, a method of adjusting the amount of hot air blown in from the tuyere 7, etc.

[0081] The method of charging the measuring device 11 into the blast furnace 1 is not particularly limited. For example, a charging conveyor (not shown) for charging raw materials (ore and coke) can be used for conveying, and it can be charged into the blast furnace 1 from the charging port 3 together with the raw materials.

[0082] When the size is very different from that of the raw materials (ore and coke), the measuring device 11 is likely to be offset inside the blast furnace 1.

[0083] Therefore, from the viewpoint of avoiding offset inside the blast furnace 1, the particle diameter of the measuring device 11 (housing 12) is preferably of the same order as the particle diameter of the raw materials (usually 30 to 60 mm).

[0084] Specifically, the difference in particle diameter between the measuring device 11 (housing 12) and the raw materials is preferably 10 mm or less, and more preferably 5 mm or less.

[0085] The particle diameter is the average particle diameter obtained by the laser diffraction / scattering method.

[0086] The material of the housing 12 may be a conductive metal, but a metal with a melting point lower than the highest temperature inside the blast furnace 1 is preferably used.

[0087] Thereby, the measuring device 11 (housing 12) melts until it reaches the highest temperature inside the blast furnace 1, so that it can be prevented from becoming a cause of blockage inside the blast furnace 1 or causing damage to the blast furnace 1.

[0088] In Figure 4In this case, as an example, a measuring instrument 11 is shown in which six circular through-holes 13 are formed in a spherical housing portion 12, but the shape of the housing portion 12, the number of through-holes 13, the shape of the through-holes 13, etc. are not limited thereto.

[0089] As the shape of the housing portion 12, for example, spherical shapes such as a spherical shape and an oblate spheroid shape; regular polyhedron shapes such as a regular hexahedron shape and a regular dodecahedron shape; polyhedron shapes other than regular polyhedron shapes, etc. can be cited.

[0090] Among them, from the viewpoint of avoiding bias inside the blast furnace 1, a spherical shape or a regular polyhedron shape is preferred, and a spherical shape is more preferred.

[0091] The number and position of the through-holes 13 are not particularly limited.

[0092] However, when the number of through-holes 13 is small or when a plurality of through-holes 13 are offset toward the housing portion 12, the position dependence of the measuring instrument 11 is high (depending on the position and orientation inside the blast furnace 1, the operation such as resonance is likely to be different).

[0093] Therefore, from the viewpoint of reducing the position dependence of the measuring instrument 11, the number of through-holes 13 is preferably 2 or more, more preferably 4 or more, and further preferably 6 or more.

[0094] In addition, for the same reason, it is preferable that a plurality of through-holes 13 are arranged at point-symmetrical positions with respect to the center of the housing portion 12.

[0095] Figure 6 It is a perspective view showing a part of the measuring instrument 11 in which the through-hole 13 has a cross shape. That is, in Figure 6 the shown spherical housing portion 12, six cross-shaped through-holes 13 are formed at point-symmetrical positions.

[0096] In this way, the shape of the through-hole 13 is not particularly limited, and for example, a circular shape, an elliptical shape, a polygonal shape, a cross shape, etc. can be cited.

[0097] However, from the viewpoint of reducing the position dependence of the measuring instrument 11, as the shape of the through-hole 13, a circular shape is preferred.

[0098] It is also possible to fill the internal space 14 of the measuring instrument 11 with a non-conductive dielectric. Thereby, even if pressure is applied from the outside to the measuring instrument 11 (housing portion 12), it is not easily deformed.

[0099] In addition, when comparing the sensors 11 with the same particle size to each other, as the relative permittivity of the dielectric filled in the internal space 14 increases, the frequency at which resonance occurs for each temperature decreases. Therefore, the relative permittivity of the dielectric can be used as an adjustment parameter when determining the particle size of the sensor 11 to be used and the frequency band of the electromagnetic wave transmitted to the sensor 11.

[0100] Figure 7 FIG. is an enlarged cross-sectional view showing the blast furnace 1 in which the receiving unit 31 is disposed inside.

[0101] As described above, the sensor 11 gradually descends as the raw material falls. Therefore, when the transmitting unit 21 and the receiving unit 31 are disposed at the charging port 3 (see Figure 3 ), the distance (hereinafter, also referred to as "distance D") from the transmitting unit 21 to the receiving unit 31 via the sensor 11 also gradually becomes longer. If the distance D becomes too long, the electromagnetic wave (especially the electromagnetic wave transmitted from the sensor 11 and received by the receiving unit 31) is likely to attenuate.

[0102] Therefore, as Figure 7 shown, the transmitting unit 21 may be disposed at the charging port 3 of the blast furnace 1, and the receiving unit 31 may be disposed inside the blast furnace 1 (more specifically, at a position in contact with the raw material charged into the blast furnace 1). Thereby, the distance D is substantially constant regardless of the position of the sensor 11, and thus attenuation of the electromagnetic wave can be suppressed.

[0103] In Figure 7 , the receiving unit 31 is attached to the front end of the insertion tube 41.

[0104] The insertion tube 41 is, for example, a detector for inserting a probe (not shown) into the blast furnace 1 when gas sampling is performed, and is set to be movable in the horizontal direction in Figure 7 .

[0105] By moving the insertion tube 41 in the horizontal direction, the receiving unit 31 attached to the front end thereof also moves in the horizontal direction inside the blast furnace 1.

[0106] By moving the insertion tube 41, for example, the receiving unit 31 can be moved to the central position of the blast furnace 1 during use, or retracted to a position in contact with the main body 2 (sheet metal and refractory brick) of the blast furnace 1 when not in use.

[0107] Figure 8 FIG. is an enlarged cross-sectional view showing another example of the blast furnace 1 in which the receiving unit 31 is disposed inside.

[0108] In Figure 8In the [description], a plurality of receiving parts 31 are arranged at different circumferential positions inside the blast furnace 1, and these plurality of receiving parts 31 respectively receive the electromagnetic waves transmitted from the measuring device 11. Thereby, even if the electromagnetic waves transmitted from the measuring device 11 attenuate, it is easy to receive the electromagnetic waves.

[0109] In Figure 8 In the main body 2 (sheet iron and refractory bricks) of the blast furnace 1 shown, a plurality of holes 51 are formed in the circumferential direction, and each hole 51 is blocked by a cover 52. A protrusion 53 is formed on the inner side (the inner side of the blast furnace 1) of the cover 52, and a receiving part 31 is installed at the front end of the protrusion 53.

[0110] By inserting the cover 52 equipped with the receiving part 31 into the hole 51, the receiving part 31 can be arranged inside the blast furnace 1. Moreover, by removing the cover 52 from the hole 51, the receiving part 31 can be easily taken out from the inside of the blast furnace 1 to perform maintenance and the like.

[0111] In addition, when the receiving part 31 is not in use, it is only necessary to insert the cover 52 not equipped with the receiving part 31 into the hole 51.

[0112] As described above, in Figure 7 and Figure 8 the receiving part 31 is arranged inside the blast furnace 1, and more specifically, at a position in contact with the raw materials charged into the blast furnace 1.

[0113] However, if the receiving part 31 comes into contact with the molten raw materials, for example, it is easily damaged.

[0114] Therefore, the receiving part 31 is preferably arranged at least at a position not in contact with the welding zone 8, and more preferably at a position above the upper end of the welding zone 8 (the welding zone 8 located at the uppermost side inside the blast furnace 1).

[0115] In addition, as Figure 7 and Figure 8 shown, a plurality of transmitting parts 21 can also be arranged at different circumferential positions of the charging port 3 of the blast furnace 1.

[0116] Moreover, by transmitting synchronous electromagnetic waves from these plurality of transmitting parts 21, the intensity of the transmitted electromagnetic waves can be increased, and the attenuation of the electromagnetic waves can be further reduced.

[0117] It should be noted that, contrary to the structure shown in Figure 7 and Figure 8 the transmitting part 21 can be arranged inside the blast furnace 1, and the receiving part 31 can be arranged at the charging port 3 of the blast furnace 1.

[0118] However, in order for the transmitting unit 21 to send a large amount of energy into the measuring device 11, each component such as the transmitting antenna and the transmitter is likely to be enlarged, and there are also more opportunities for maintenance. Since the maintainability of the space not surrounded by the raw material is excellent, it is preferable that the transmitting unit 21 is arranged at the charging port 3 of the blast furnace 1, rather than being arranged inside the blast furnace 1 (at a position in contact with the raw material charged into the inside of the blast furnace 1).

[0119] As described above, the case where the temperature inside the blast furnace 1 is measured by the measuring device 11 has been described as an example, but the device to be measured for temperature is not limited to the blast furnace 1.

[0120] As the device to be measured for temperature, for example, a device whose internal temperature is difficult to directly measure due to various reasons (such as high risk and complex internal structure) can be cited.

[0121] It should be noted that as the device to be measured for temperature, it may also be opened in order to transmit electromagnetic waves from the transmitting unit 21 to the measuring device 11 inserted inside (and the receiving unit 31 receives the electromagnetic waves transmitted by the measuring device 11).

[0122] As such a device, a furnace into which raw materials (powdered raw materials, granular raw materials, etc.) are charged is preferably used. As a specific example thereof, in addition to the blast furnace 1, furnaces (reaction furnaces) with a high temperature inside such as coke ovens, sintering furnaces, and oxygen blast furnaces (blast furnaces using pure oxygen instead of hot air) can be cited.

[0123] For example, in a coke oven, coal as a raw material is charged into the inside of the carbonization chamber from above, and then steamed and burned to become coke. The obtained coke is discharged to the outside by an extruder arranged on the side of the carbonization chamber.

[0124] In the case where such a coke oven (carbonization chamber) is the object to be measured for temperature, for example, the transmitting unit 21 is arranged above the carbonization chamber (charging port 3), and the receiving unit 31 is arranged on the side of the carbonization chamber. Together with the coal as the raw material, the measuring device 11 is charged into the inside of the carbonization chamber from the charging port 3.

[0125] It should be noted that even for a furnace, a converter into which metal is charged inside is basically excluded from the objects to be measured for temperature.

[0126] Description of reference numerals

[0127] 1: Blast furnace

[0128] 2: Main body

[0129] 3: Charging port

[0130] 5: Ore layer

[0131] 6: Coke layer

[0132] 7: Tuyere

[0133] 8: Welding strip

[0134] 9: Molten iron

[0135] 11: Measuring device

[0136] 12: Shell part

[0137] 13: Through hole

[0138] 14: Internal space

[0139] 21: Sending part

[0140] 31: Receiving part

[0141] 41: Insertion tube

[0142] 51: Hole

[0143] 52: Cover

[0144] 53: Protrusion

Claims

1. A temperature measuring device, characterized in that, Comprising: A measuring device, which has a metal shell part covering the internal space and is a hollow body provided with a through hole connecting the internal space and the outside in the shell part; A transmitting part, which transmits electromagnetic waves of the resonance frequency of the measuring device to the measuring device to make the measuring device resonate; A receiving part, which receives the electromagnetic waves transmitted from the resonated measuring device; The measuring device is installed inside the device to be measured for temperature, and the resonance frequency changes due to expansion and contraction according to the temperature.

2. The temperature measuring device according to claim 1, characterized in that, The device is a furnace with raw materials loaded inside.

3. The temperature measuring device according to claim 2, characterized in that, The furnace has an inlet for loading the raw materials into the interior of the furnace, The transmitting part is arranged at the inlet.

4. The temperature measuring device according to claim 2 or 3, characterized in that, The furnace is a blast furnace.

5. A temperature measuring method, characterized in that, Use the temperature measuring device according to claim 1 to measure the temperature inside the device.

6. The temperature measuring method according to claim 5, characterized in that, Load raw materials into the interior of the device, Install the measuring device into the interior of the device together with the raw materials.

7. The temperature measuring method according to claim 5 or 6, characterized in that, Control the temperature inside the device based on the measured temperature.

8. The temperature measuring method according to any one of claims 5 to 7, characterized in that, The device is a furnace with raw materials loaded inside.

9. The temperature measuring method according to claim 8, characterized in that, The furnace has an inlet for loading the raw materials into the interior of the furnace, The transmitting part is arranged at the inlet.

10. The temperature measuring method according to claim 8 or 9, characterized in that, The furnace is a blast furnace.

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