Device for measuring deposition level of charged material and method for operating various facilities

Abstract

To enhance a noise reduction effect by removing standing reflection noise generated inside a guide pipe, and to more accurately measure a deposition level of a charged material. Various facilities are efficiently operated on the basis of the measured value of the deposition level.SOLUTION: Provided is a device for measuring the accumulation level of a charge, which is installed in an opening of a container of various equipment, transmits a detection wave toward the surface of the charge accumulated in the container through the opening, receives a reflected wave of the detection wave reflected by the surface, and measures the accumulation level of the charge, wherein the device is provided with a means for transmitting and receiving the detection wave, and a guide pipe, one end of which is connected to the means for transmitting and receiving and the other end of which is open, for transmitting the detection wave to the inside of the container by propagating the detection wave therein, and for receiving the reflected wave by the means for transmitting and receiving. A part or the whole of the inner wall of the guide pipe is covered with a radio wave absorber, or a part or the whole of the guide pipe is formed of the radio wave absorber.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a measuring device for three-dimensionally detecting the surface profile of a charge deposited in a vessel of various equipment, and also to a method for operating various equipment using the measuring device. [Background technology]

[0002] For example, a coke oven has multiple coal loading ports on the top, and coal is loaded sequentially through the loading ports while a coal loading car is moving. At this time, it is necessary to measure the loading level of the coal loaded into the coke oven and load as much coal as possible to increase productivity.

[0003] The present applicant has previously proposed a coal level measuring device, as described in Patent Document 1, in which a detection wave transmitting and receiving means is connected to an opening in the ceiling of a coal charging chute for charging coal into the coal charging port of a coke oven by a guide pipe, and the detection wave from the transmitting and receiving means is propagated through the inside of the guide pipe and the coal charging chute to detect the reflected wave from the coal accumulated in the coke oven. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-172184 Summary of the Invention [Problem to be solved by the invention]

[0005] In the method described in Patent Document 1, in which a detection wave is propagated inside a guide pipe, stationary reflection noise is generated when the propagating detection wave is reflected by the inner wall of the guide pipe, as shown in Fig. 3A. This reflection noise is superimposed on randomly fluctuating noise generated inside the coke oven. Such noise becomes more pronounced as the guide pipe becomes longer.

[0006] The present invention has been made in view of the above circumstances, and aims to provide a level measurement device that can remove stationary reflection noise generated inside a guide pipe to enhance the noise reduction effect and more accurately measure the burden material pile level. Another aim of the present invention is to provide a method for efficiently operating various facilities by controlling the burden material charge amount based on the measurement value of the burden material pile level. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides the following burden pile level measuring devices (1) to (8).

[0008] (1) A burden material pile level measuring device that is installed at the opening of a container of various equipment, transmits a detection wave through the opening toward the surface of the burden material piled up in the container, receives the reflected wave of the detection wave reflected by the surface, and measures the pile level of the burden material, means for transmitting and receiving the detection wave; a guide pipe having one end connected to the transmitting / receiving means and the other end open, the guide pipe propagating the detection wave therethrough and transmitting it to the inside of the container, and the reflected wave being received by the transmitting / receiving means; A charge accumulation level measuring device characterized in that a part or all of the inner wall of the guide pipe is covered with a radio wave absorber, or a part or all of the guide pipe is formed with a radio wave absorber. (2) An apparatus for measuring the coal accumulation level in a coke oven, the apparatus transmitting a detection wave to the surface of coal fed from a coal receiving hopper to a coal charging chute by a coal feeding device and supplied into the coke oven through the coal charging chute, and receiving a wave of the detection wave reflected by the surface of the coal, The burden pile level measuring device according to (1), characterized in that the other end of the guide pipe is connected to an opening in the ceiling surface of the coal injection chute. (3) The guide pipe is provided with a reflector at the bent portion, and a part or all of the inner wall of the bent portion other than the reflector is covered with a radio wave absorber. (4) A charge accumulation level measuring device according to (2), characterized in that the accumulation level is measured multiple times and either one or both of the obtained received beat waveform and the distance spectrum waveform obtained by FFT processing of the received beat waveform are averaged. (5) The burden pile level measuring device according to (2), characterized in that a dustproof and heatproof plate is provided at a connecting portion of the guide pipe with the coal charging chute. (6) An apparatus for measuring the accumulation level of slag, wherein the vessel is a converter, the apparatus transmits the detection wave to the surface of slag accumulated on the liquid surface of molten iron through a measurement opening formed in the converter, and receives the detection wave reflected by the surface of the slag, the other end of the guide pipe faces the measurement opening; The charge pile level measuring device according to (1), characterized in that: (7) A charge accumulation level measuring device according to (6), characterized in that the accumulation level is measured multiple times and either one or both of the obtained received beat waveform and the distance spectrum waveform obtained by FFT processing of the received beat waveform are averaged. (8) A reflector is provided at the other end of the guide pipe, the reflector being inclined so that the reflecting surface faces the measurement opening; The charge accumulation level measuring device according to (6), characterized in that the guide pipe is moved so that the reflective surface faces the measurement opening when measuring, and the guide pipe is moved so that the reflective surface is away from the measurement opening when not measuring.

[0009] In order to solve the above problems, the present invention also provides the following operating method (9).

[0010] (9) An operating method, characterized by measuring the pile level of a charge material using the pile level measuring device described in any one of (1) to (8), and controlling the supply conditions or treatment conditions of the charge material to the vessel based on the measurement results. [Effects of the Invention]

[0011] The pile level measuring device of the present invention can prevent the influence of high temperatures and dust from the containers of various facilities, and can reliably measure the pile level with a low noise level. Furthermore, stable operation can be achieved by accurately controlling the amount of charging material based on the measurement results. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a cross-sectional view showing an example of an accumulation level measuring device applied to a coke oven as a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view showing the dustproof and heatproof plate. [Figure 3A] FIG. 3A is a schematic diagram showing the propagation of a detection wave radiated from an antenna when there is no radio wave absorber. [Figure 3B] FIG. 3B is a schematic diagram showing the propagation of a detection wave radiated from an antenna when a radio wave absorber is present. [Figure 4] FIG. 4 is a schematic diagram showing how a detection wave propagates through a bent portion when a radio wave absorber is present. [Figure 5A] FIG. 5A is a schematic diagram showing the configuration of a conventional guide pipe used in the "Experiment to verify the noise reduction effect of a radio wave absorber." [Figure 5B] FIG. 5B is a schematic diagram showing the configuration of a guide pipe according to the present invention used in the "Experiment for verifying the effect of noise reduction by a radio wave absorber." [Figure 6A] FIG. 6A shows the results when the guide pipe of FIG. 5A is used. [Figure 6B] FIG. 6B shows the results when the guide pipe of FIG. 5B is used. [Figure 6C]FIG. 6C is a diagram showing the results when the guide pipe of FIG. 5B is used and averaging processing is further performed. [Figure 7] FIG. 7 is a cross-sectional view showing another example of the guide pipe shown in FIG. [Figure 8] FIG. 8 is a cross-sectional view showing an example of an accumulation level measuring device when applied to a converter, as a second embodiment of the present invention. [Figure 9] FIG. 9 is a view of the pile level measuring device of FIG. 8 as seen from above the converter, where (a) shows the positions of the guide pipe and the transmitting / receiving means during measurement, and (b) shows the positions of the guide pipe and the transmitting / receiving means when not measuring. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention will now be described in detail with reference to the drawings.

[0014] First Embodiment First, a first embodiment of the present invention will be described. FIG. 1 is a cross-sectional view showing the overall configuration of a pile level measuring device (hereinafter referred to as the "measuring device") when applied to a coke oven as an example of various types of equipment. As shown in the figure, the entire measuring device is installed inside a typical coal loading car 1. The coal loading car 1 includes a coal receiving hopper 10 that stores coal C supplied from the outside, and a coal feeding device 12 that sends the coal C in the coal receiving hopper 10 to a coal charging chute 11. The coal feeding device 12 is generally a table feeder or a screw feeder. The lower end of the coal charging chute 11 is fitted with a sleeve 13 that narrows inward at its lower end and is fitted to the exterior to fit the diameter of the coal charging port 102 of the coke oven 100. The coal loading car 1 moves along rails 101 fixed to the top surface of the coke oven 100, for example, in the front-to-rear direction of the drawing as shown.

[0015] An opening 11b is formed in the center of the ceiling surface 11a of the coal charging chute 11, and one end of a guide pipe 40 is attached to the opening 11b. The guide pipe 40 is generally L-shaped and consists of a first vertical pipe section 40A connected to the opening 11b of the coal charging chute 11 and a horizontal pipe section 40B parallel to the ceiling surface 11a of the coal charging chute 11. An inclined section 40D, which connects the first vertical pipe section 40A and the horizontal pipe section 40B, is a 90° bent section and is equipped with a first reflector 41. The first reflector 41 is a 45° reflector, inclined downward by 45° so that its reflective surface faces the opening 11b of the coal charging chute 11 and the antenna 22. An antenna 22 is housed at the end of the horizontal pipe section 40B opposite the first reflector 41, and a means for transmitting and receiving a detection wave M is attached to the antenna 22. The antenna 22 may be provided with a dielectric lens 23 .

[0016] In addition, to prevent dust and heat from entering from the coke oven 100 through the coal charging port 102, as shown in FIG. 2, the first vertical pipe section 40A is closed with a dustproof / heat-shielding plate 70. That is, the dustproof / heat-shielding plate 70 is provided at the connection point of the guide pipe 40 with the coal charging chute 11. The dustproof / heat-shielding plate 70 is surrounded by a frame 72 and is configured to be pulled out to the outside of the first vertical pipe section 40A using a handle 71 on the side of the frame 72. This allows dust adhering to the dustproof / heat-shielding plate 70 on the coal charging port 102 side of the coke oven 100 to be easily cleaned. The dustproof / heat-shielding plate 70 is made of a heat-resistant material that is transparent to the detection wave M, and for example, a quartz glass plate or a ceramic plate can be used.

[0017] As the detection wave M, microwaves or millimeter waves that are not easily affected by the temperature inside the coke oven 100, dust, steam, etc., can be used.

[0018] In the coal loading car 1 configured as above, the sleeve 13 stops at a position directly above the coal charging port 102 of the coke oven 100, and the coal C in the coal receiving hopper 10 is sent to the coal charging chute 11 by the coal feeder 12, and the coal C is charged into the coke oven 100 from the sleeve 13 through the coal charging port 102. Then, as shown by the dashed-dotted line in the figure, the detection wave M from the transmitting / receiving means 20 is propagated via the antenna 22 to the guide pipe 40 and then the coal charging chute 11, and sent through the coal charging port 102 to the coal C' piled up in the coke oven 100. The reflected wave M' of the detection wave M reflected by the surface of the coal C' travels the reverse path and is received by the transmitting / receiving means 20, and the pile level of the coal C' (charging level) is measured based on the time difference between transmission and reception.

[0019] 3A and 3B are both diagrams that schematically show how the detection wave M radiated from the antenna 22 propagates toward the inside of the horizontal pipe portion 40B of the guide pipe 40. As shown in FIG.

[0020] Conventionally, as shown in FIG. 3A, the detection wave M includes a component due to a main lobe (hereinafter referred to as "main lobe wave 30") that propagates through the internal space of the horizontal pipe section 40B parallel to the inner wall of the horizontal pipe section 40B, as well as a component reflected by the inner wall of the horizontal pipe section 40B (hereinafter referred to as "side lobe wave 31"). The noise resulting from the side lobe wave 31 and the reflected noise from the inside of the coke oven 100 are superimposed, increasing the noise level. In contrast, as shown in FIG. 3B, when the horizontal pipe section 40B is covered with a radio wave absorber 50, the side lobe wave 31 is absorbed and only the main lobe wave 30 propagates.

[0021] 4 is a diagram schematically illustrating the state of the detection wave M around the inclined portion 40D of the guide pipe 40. In addition to the inner wall of the horizontal pipe portion 40B, the radio wave absorber 50 covers the inner wall of the inclined pipe portion 40E facing the first reflecting plate 41, and the inner wall of the dustproof / heatproof plate 70 of the first vertical pipe portion 40A shown in FIG. 2 on the first reflecting plate 41 side. As shown in FIG. 3B, the side lobe wave 31 is absorbed by the radio wave absorber 50, so only the main lobe wave 30 is incident on the first reflecting plate 41 and propagates to the first vertical pipe portion 40A.

[0022] In this way, by covering part or all of the inner walls of the guide pipe 40 with radio wave absorber 50, such as the inner walls of the inclined section 40D excluding the first reflecting plate 41, the inclined pipe section 40E, and the inner wall on the first reflecting plate 41 side of the dustproof and heatproof plate 70 of the first vertical pipe section 40A shown in Figure 2, it is possible to eliminate standing reflection noise caused by side lobe waves 31.

[0023] Instead of covering part or all of the inner wall of the guide pipe 40 with the radio wave absorber 50 as described above, part or all of the inclined portion 40D of the guide pipe 40, excluding the first reflector 41, may be formed from a radio wave absorbing material such as a carbon material.

[0024] Furthermore, by stopping the coal loading car 1 at a position where the sleeve 13 is directly above the coal loading port 102 of the coke oven 100, stopping coal loading while the car is stopped, and measuring the coal loading level multiple times (N times), and then averaging either or both of the received beat waveform and the distance spectrum waveform obtained by FFT processing of the beat waveform, the floor noise power can be reduced by 1 / N, allowing for more accurate measurement of the coal loading level. This measurement mode not only reduces the noise level, but also makes it possible to make the aperture diameter of the antenna 22 smaller, thereby saving space.

[0025] [Verification results] Next, the following verification experiment was carried out to verify the noise reduction effect of the accumulation level measuring device of this embodiment.

[0026] (Experiment 1) 5A and 5B are diagrams of metallic evaluation guide pipes fabricated to verify noise reduction effects. The guide pipe 60A shown in FIG. 5A is comprised of a first metal guide pipe 61 and a second metal guide pipe 62 of the same length, connected by a metal inclined section 63, which is a 90° bend and equipped with a 45° reflector 64. The guide pipe 60B shown in FIG. 5B is comprised of the first metal guide pipe 61, the second metal guide pipe 62, and the metal inclined section 63, except for the reflector 64, covered with radio wave absorber 50. This is a guide pipe according to the present invention. In both guide pipes 60A and 60B, the propagation path length from the tip of the dielectric lens 23 to the opening 65 was set to 2 m, and coal 66 was placed 5 m away from the opening 65. Furthermore, in order to simulate a decrease in the reception level of the detection wave M due to dust adhesion, the reception gain of the transmitting and receiving means 20 was lowered to a level where the distance spectrum waveform from the coal 66 was equivalent to the noise level. Under these conditions, the distance spectrum waveform from the coal 66 was observed.

[0027] Fig. 6A shows the measurement results when guide pipe 60A of Fig. 5A was used, and Fig. 6B shows the measurement results when guide pipe 60B of Fig. 5B was used. The position of opening 65 was set to 0 mm.

[0028] As shown in Fig. 6A, when there is no radio wave absorber 50, the distance spectrum waveform from the coal 66 that should appear at a position of 5 m is buried in noise and cannot be observed. In contrast, as shown in Fig. 6B, when there is a radio wave absorber 50, the distance spectrum waveform from the coal that appears at a position of 5 m appears at a higher level than the distance spectrum waveforms at other distances, which means that the standing noise resulting from the side lobe waves 31 (see Figs. 3A and 3B) is reduced.

[0029] (Experiment 2) In Experiment 2, we verified the effect of averaging multiple measurements. Specifically, we measured coal 66 multiple times using the guide pipe 60B shown in Figure 5B, and then averaged the resulting beat waveforms and the distance spectrum waveforms obtained by FFT-processing the beat waveforms. The results are shown in Figure 6C. The noise level is lower than in Figure 6B, where no averaging was performed, and the distance spectrum waveform from coal 66 can be observed more accurately. This is because the radio wave absorber 50 covering the inner wall of guide pipe 60B eliminated side lobe waves 31 that propagate while reflecting off the inner wall of guide pipe 60B, eliminating stationary reflection noise. Furthermore, the effect of averaging reduced randomly fluctuating noise.

[0030] Thus, according to the present invention, in the deposition level measuring device shown in Figure 1, by covering part or all of the inner wall of the guide pipe 40, excluding the first reflecting plate 41, with a radio wave absorber 50, it is possible to eliminate standing noise generated inside the guide pipe 40.

[0031] As a result, even if dust adheres to the dustproof / heatproof plate 70 and the reception level of the reflected wave M' from the surface of the coal C' is attenuated, the effect of reducing the floor noise power by 1 / N (N: number of measurements) can be enhanced by performing an arithmetic averaging process on either or both of the beat waveform obtained by measuring the coal loading level multiple times and the distance spectrum waveform obtained by FFT processing of the beat waveform, thereby making it possible to extract the reflected wave M' buried in the noise.

[0032] 7, the guide pipe 40 may be configured with a second vertical pipe section 40C extending vertically upward from the horizontal pipe section 40B in the figure, and the antenna 22 may be housed in the second vertical pipe section 40C. A second reflector 42 may be provided at the connecting portion between the horizontal pipe section 40B and the second vertical pipe section 40C of the guide pipe 40. The second reflector 42 is a 45° reflector, and is inclined upward by 45° so that its reflective surface faces the first reflector 41 and the antenna 22 of the second vertical pipe section 40C. With this configuration, the transmitting / receiving means 20 can be spaced farther from the coal charging port 102 of the coke oven 100 than in FIG. 1.

[0033] 7, by covering all or part of the inner wall of the guide pipe 40, excluding the first reflector 41 and the second reflector 42, with a radio wave absorber, it is possible to remove standing reflection noise generated inside the guide pipe 40 and improve the effectiveness of the averaging process. Furthermore, although not shown, the same effect can be obtained by using a material molded from a radio wave absorbing material such as a carbon material for all or part of the guide pipe 40, excluding the first reflector 41 and the second reflector 42.

[0034] The guide pipe 40 may have a straight pipe shape, although not shown, in addition to the configuration shown in FIGS.

[0035] Second Embodiment Next, a second embodiment of the present invention will be described. Fig. 8 is a cross-sectional view showing an example of an accumulation level measurement device applied to a converter, as an example of various facilities. As shown in the figure, in a converter 200, a gas such as oxygen is blown onto molten pig iron 250 from a main lance 210 inserted through a main lance opening 205 formed at the top of the furnace. During this process, slag 260 is generated and deposited on the liquid surface of the molten pig iron 250. As the blowing progresses, the slag 260 turns into slag, which increases the tendency for the slag 260 to foam. This can lead to slopping (a phenomenon in which the foamed slag 260 overflows from the converter 200). Therefore, it is desirable to measure the level of the slag 260 more accurately in real time.

[0036] However, the foamed slag 260 during blowing contains CO bubbles generated during the blowing process and expands, resulting in low reflectivity, making it necessary to detect a minute reflected wave M'. Furthermore, the reflected wave is affected by a large amount of flying material floating in the air of the converter 200 during blowing, making stable measurement difficult.

[0037] Therefore, in this embodiment, in order to suppress the influence of heat from inside the furnace on the transmitting and receiving means 20, a long, straight guide pipe 300 is used, with one end connected to the transmitting and receiving means 20 and the other end open and connected to a third reflector 310. An antenna 22 is connected to the transmitting and receiving means 20, and the antenna 22 is housed in one end of the guide pipe 300.

[0038] The third reflector 310 is a 45° reflector, and is inclined downward at 45° so that the reflecting surface faces the measurement opening 220 of the converter 200 and the antenna 22. Therefore, the detection wave M from the transmitting / receiving means 20 propagates through the inside of the guide pipe 300 via the antenna 22, is transmitted by the third reflector 310 through the measurement opening 220 of the converter 200 into the inside of the converter 200, is reflected by the surface of the formed slag 260, and the reflected wave travels the reverse path of the transmission path and is received by the transmitting / receiving means 20.

[0039] As in the first embodiment, the inner wall of the guide pipe 300 is partially or entirely covered with a radio wave absorber 50, or, although not shown, the guide pipe 300 is partially or entirely made of a radio wave absorbing material. This makes it possible to measure minute reflected waves M' from the surface of the foamed slag 260 during blowing, which could not be measured in the past because they were buried in the noise level.

[0040] Furthermore, as in the first embodiment, measurements are taken multiple times (N times) at the same location on the surface of the formed slag 260, and by averaging either or both of the received beat waveform and the distance spectrum waveform obtained by FFT processing of the beat waveform, the floor noise power can be reduced by 1 / N, and the influence of random reflected waves from scattered debris in the converter can be eliminated.

[0041] As described above, in the second embodiment, the third reflector 310 is attached to the guide pipe 300, and the level of the formed slag 260 is measured by transmitting and receiving the detection wave M with the third reflector 310 facing the measurement opening 220. Therefore, during measurement, the measuring device is exposed to high temperatures from the converter 200 through the measurement opening 220, and even though the guide pipe 300 is long, the transmitting and receiving means 20 is also subjected to a considerable thermal load.

[0042] 9 is a top view of the converter 200 of the measuring device of FIG. 8, and as shown in FIG. 9(a), during the above-described measurement, the third reflector 310 of the guide pipe 300 faces the measurement opening 220 of the converter 200. Therefore, as shown in FIG. 8, a motor 320 is connected to the transmitting and receiving means 20, and when measurement is not being performed, the guide pipe 300 is rotated by a predetermined angle (e.g., 90°) around the transmitting and receiving means 20 as a rotation fulcrum, as shown in FIG. 9(b), thereby making it more difficult for the high heat from the converter 200 to be transmitted to the transmitting and receiving means 20. This makes it possible to further reduce the thermal load on the transmitting and receiving means 20.

[0043] Furthermore, the converter 200 is generally provided with a sublance 221 as shown in the figure, but a sublance opening (not shown) for inserting the sublance 221 into the furnace can also be used as the measurement opening 220. Then, when the sublance 221 is pulled out of the furnace, the third reflector 310 of the guide pipe 300 is rotated to the position of the sublance opening to perform the measurement.

[0044] The measurement opening 220 may be provided at a location separate from the sublance opening.

[0045] In this way, by changing the guide pipe between when measurement is performed and when not measurement is performed, interference between the sublance 221 and the guide pipe 300 can be prevented.

[0046] The first and second embodiments described above are examples of a level measurement device, and the level measurement device can also be applied to measuring the pile levels of charges in containers of various facilities, such as iron ore and coke in a blast furnace, molten steel in a converter, coal in a hopper, and grains in a storage facility such as a silo.

[0047] [Operation method] The present invention also relates to a method for performing charging work using the above-mentioned measuring device. That is, the measuring device is used to accurately measure the pile level of charge materials and efficiently operate various facilities such as a coke oven 100 and a converter 200. For example, when the measuring device is applied to the coke oven 100 as the various facilities, the amount of coal C supplied is controlled, and when the measuring device is applied to the converter 200 as the various facilities, the amount of oxygen gas supplied from the main lance, the lance height, etc. are controlled. [Explanation of symbols]

[0048] 1 coal car 10 Coal receiving hopper 11 Coal chute 11a Ceiling surface 11b opening 12 Coal feeder 13 Sleeve 20 Transmission and Reception Means 22 Antenna 23 Dielectric Lens 40 Guide pipe 40A First vertical pipe section 40B Horizontal pipe section 40C Second vertical pipe section 40D slope section 41 First Reflector 42 Second reflector 50 Radio wave absorber 60A, 60B guide pipe 61 First metal guide pipe 62 Second metal guide pipe 63 Metal slope 64 Reflector 65 Aperture 66 Coal 70 Dustproof / heatproof plate 71 Handle 100 coke ovens 101 Rail 102 Coal loading port C,C′ Coal M detection wave M′ reflected wave 200 converter 205 Main lance opening 210 Main Lance 220 Measuring aperture 221 Sublance 250 molten iron 260 Slag 300 guide pipe 310 Third Reflector 320 Motor

Claims

1. A burden material accumulation level measuring device that is installed at an opening of a container of various equipment, transmits a detection wave through the opening toward the surface of a burden material accumulated in the container, receives a reflected wave of the detection wave reflected by the surface, and measures the accumulation level of the burden material, means for transmitting and receiving the detection wave; a guide pipe having one end connected to the transmitting / receiving means and the other end open, the guide pipe propagating the detection wave therethrough and transmitting it to the inside of the container, and the reflected wave being received by the transmitting / receiving means; A charge accumulation level measuring device characterized in that a part or all of the inner wall of the guide pipe is covered with a radio wave absorber, or a part or all of the guide pipe is formed with a radio wave absorber.

2. The vessel is a coke oven, and the apparatus transmits a detection wave to a surface of coal that is fed from a coal receiving hopper to a coal charging chute by a coal feeding device and supplied into the coke oven through the coal charging chute, and receives a reflected wave of the detection wave reflected by the surface of the coal to measure the coal accumulation level, 2. The burden pile level measuring device according to claim 1, wherein the other end of the guide pipe is connected to an opening in the ceiling surface of the coal injection chute.

3. The charge accumulation level measuring device according to claim 2, characterized in that the guide pipe is provided with a reflector at the bent portion, and a part or all of the inner wall of the bent portion other than the reflector is covered with a radio wave absorber.

4. 3. The device for measuring the deposition level of charged materials according to claim 2, characterized in that the deposition level is measured multiple times, and either one or both of the obtained received beat waveform and the distance spectrum waveform obtained by FFT processing of the received beat waveform are averaged.

5. 3. The burden pile level measuring device according to claim 2, wherein a dustproof and heatproof plate is provided at a connecting portion of the guide pipe with the coal charging chute.

6. The vessel is a converter, and the detection wave is transmitted to a surface of slag deposited on a liquid surface of molten iron through a measurement opening formed in the converter, and a reflected wave of the detection wave reflected by the surface of the slag is received to measure the deposition level of the slag, the other end of the guide pipe faces the measurement opening; 2. The device for measuring the pile level of charge according to claim 1.

7. The device for measuring the deposition level of a load material according to claim 6, characterized in that the deposition level is measured multiple times, and either one or both of the obtained received beat waveform and the distance spectrum waveform obtained by FFT processing of the received beat waveform are averaged.

8. a reflector provided at the other end of the guide pipe, the reflector being inclined so that the reflecting surface faces the measurement opening; 7. The device for measuring the pile level of charged material according to claim 6, characterized in that, when measuring, the guide pipe is moved so that the reflective surface faces the measurement opening, and when not measuring, the guide pipe is moved so that the reflective surface is away from the measurement opening.

9. An operation method, comprising: measuring a pile level of a charge material using the pile level measuring device according to any one of claims 1 to 8; and controlling supply conditions or treatment conditions of the charge material to the vessel based on the measurement results.

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