JP2024082185A - Apparatus for detecting surface profile of blast furnace load - Google Patents

Abstract

[Problem] To prevent dust floating in a blast furnace from entering the detection device, and to transmit and receive detection waves more accurately and stably. [Solution] A surface profile detection device 100 for detecting material loaded in a blast furnace includes a detection wave transmission plate 200 that closes an opening 175 for transmitting and receiving a detection wave M, and rotates parallel to the opening 2 of the blast furnace 1 while maintaining approximately parallelism with the center of the opening 175 as an axis, a blocking plate 210 that covers the detection wave transmission plate 200, and a first nozzle 230 that is disposed between the detection wave transmission plate 200 and the blocking plate 210 and that sprays a purging medium G from below onto a surface 201 of the detection wave transmission plate 200 on the blast furnace 1 side, and removes dust floating in the furnace, entering through the opening 2 of the blast furnace 1, and adhering to the surface 201 of the detection wave transmission plate 200 on the blast furnace side by spraying the purging medium G from the first nozzle 230. [Selected Figure] Fig. 3A

Description

The present invention relates to a detection device that detects the surface profile of iron ore, coke, lime, etc. (hereinafter collectively referred to as "charge materials") in a blast furnace.

In a blast furnace, by optimizing the charge stacking condition and stabilizing the gas flow inside the furnace, it is possible to reduce fuel costs and extend the life of the furnace body. To achieve the proper stacking condition, it is necessary to accurately measure the surface profile of these charge materials in a short time and replenish the charge materials so that the theoretical stacking condition, or "theoretical stacking profile," that has been determined in advance is achieved.

To detect the surface profile of the burden material in such a blast furnace, a detection device is widely used that is installed at an opening in the blast furnace, transmits a detection wave through the opening toward the surface of the burden material accumulated in the furnace, receives the detection wave reflected by the surface of the burden material, and detects the surface profile of the burden material.

The present applicant has also previously proposed a detection device, for example as described in Patent Document 1, which uses a variable-angle reflector with a variable inclination angle of the reflecting surface of the detection wave toward the blast furnace and a fixed-angle reflector, and attaches the variable-angle reflector and fixed-angle reflector to a rotating plate that rotates horizontally with the opening of the blast furnace. By rotating the rotating plate, the surface profile of the charges accumulated in the blast furnace can be quickly detected in a linear or planar manner.

Patent No. 6857933

However, in the above detection device, crushed charge material and various reaction products (hereinafter collectively referred to as "dust") float inside the blast furnace, and this dust may enter the device through the opening and adhere to material components such as heat-resistant materials, which may adversely affect the transmission and reception of detection waves.

The present invention was made in consideration of these circumstances, and aims to prevent dust suspended inside a blast furnace from entering the detection device, and to transmit and receive detection waves more accurately and stably.

To solve the above problem, the present invention provides a surface profile detection device for materials loaded into a blast furnace as described below (1).

(1) A detection device for detecting a surface profile of a charge material such as iron ore, coke, or lime in a blast furnace, the detection device transmitting a detection wave toward a surface of the charge material accumulated in the furnace through an opening in the blast furnace and receiving the detection wave reflected by the surface of the charge material, the detection device comprising:
a detection wave transmitting plate that closes an opening for transmitting and receiving the detection wave of the detection device and rotates about an axis of the center of the opening while maintaining approximately parallelism with the opening of the blast furnace;
a blocking plate covering the detection wave transmitting plate;
A first nozzle is disposed between the detection wave transmitting plate and the blocking plate, and ejects a purge medium from below toward a surface of the detection wave transmitting plate on the blast furnace side.
The dust floating in the furnace, entering through the opening of the blast furnace and adhering to the surface of the detection wave transmitting plate on the blast furnace side is removed by spraying the purging medium from the first nozzle.
A device for detecting the surface profile of blast furnace interior charges.

The surface profile detection device for materials loaded into a blast furnace of the present invention is preferably any one of the following (2) to (12).

(2) The blocking plate can open and close the opening of the blast furnace, and
The first nozzle is attached to the blocking plate.
The surface profile detection device for blast furnace loading as described in (1) above.
(3) The purge medium is supplied to the first nozzle through a hole leading to an inside of a rotating shaft for opening and closing the blocking plate.
The surface profile detection device for blast furnace loading as described in (2) above.
(4) The first nozzle is attached to a fixing portion provided on the blast furnace, not to a cover member of the blocking plate, so as to protrude from the opening of the blast furnace.
The surface profile detection device for blast furnace loading as described in (1) above.
(5) The first nozzle has an ejection port for ejecting the purging medium to the outside and a main body for introducing the purging medium into the ejection port,
The nozzle has a horizontally elongated opening shape arranged along the longitudinal direction of the main body.
The surface profile detection device for blast furnace loading as described in (4) above.
(6) The axial direction of the main body is disposed in a radial direction of the detection wave transmitting plate,
The surface profile detection device for blast furnace loading as described in (5) above.
(7) In the detection wave incident on the first nozzle and the main body, the detection wave reflected in the same direction as the incident direction is smaller than the detection wave reflected in a direction different from the incident direction.
The surface profile detection device for objects loaded into a blast furnace according to (5) or (6) above.
(8) A second nozzle is further provided to eject a purge medium from a horizontal direction of the opening of the blast furnace against the surface of the detection wave transmitting plate facing the blast furnace,
The ejection of the purge medium from the first nozzle and the ejection of the purge medium from the second nozzle are performed in combination.
A surface profile detection device for objects loaded into a blast furnace according to any one of (1) to (6) above.
(9) A second nozzle is further provided to eject a purge medium from a horizontal direction of the opening of the blast furnace against the surface of the detection wave transmitting plate facing the blast furnace,
The ejection of the purge medium from the first nozzle and the ejection of the purge medium from the second nozzle are performed in combination.
The surface profile detection device for blast furnace loading as described in (7) above.
(10) When the dust adheres to the detection wave transmitting plate and a reception intensity of the reflected wave from the blocking plate falls below a predetermined threshold, the purging medium is ejected from the first nozzle toward the detection wave transmitting plate.
A surface profile detection device for objects loaded into a blast furnace according to any one of (1) to (7) above.
(11) When the dust adheres to the detection wave transmitting plate and a reception intensity of the reflected wave from the blocking plate falls below a predetermined threshold, the purging medium is ejected from the first nozzle toward the detection wave transmitting plate.
The surface profile detection device for blast furnace loading as described in (8) above.
(12) When the dust adheres to the detection wave transmitting plate and a reception intensity of the reflected wave from the blocking plate falls below a predetermined threshold, the purging medium is ejected from the first nozzle toward the detection wave transmitting plate.
The surface profile detection device for objects loaded into a blast furnace as described in (9) above.

In the following explanation, the "surface profile detection device for blast furnace loads" may be simply referred to as the "detection device."

According to the detection device of the present invention, the opening for transmitting the detection wave can be closed with a detection wave transmitting plate that transmits the detection wave, thereby preventing dust floating in the blast furnace from entering the device when the surface profile of the charge is being measured. Furthermore, when closed with the blocking plate, a purging medium can be sprayed from the first nozzle attached to the blocking plate toward the detection wave transmitting plate, thereby blowing off and removing dust that has adhered to the detection wave transmitting plate when the surface profile of the charge is not being measured. Also, even when the first nozzle is attached so as to protrude into the opening of the blast furnace, a purging medium can be sprayed from the first nozzle toward the detection wave transmitting plate, thereby blowing off and removing dust that has adhered to the detection wave transmitting plate when not being measured or when measuring.

In this way, the detection device of the present invention can prevent floating charges in the blast furnace from entering the device, and can transmit and receive detection waves accurately and stably without stopping the operation of the blast furnace.

FIG. 1 is a cross-sectional view showing the overall configuration of an example of a detection device. FIG. 2 is a cross-sectional view of a main part of the detection device shown in FIG. FIG. 3A is a cross-sectional view of a main part showing the periphery of an opening of a blast furnace in a detection device according to a first embodiment in which the present invention is applied to the detection device shown in FIG. 2 . 3B is a view of the periphery of the cover member of the blocking plate shown in FIG. 3A as viewed from the detection wave transmitting plate side. FIG. 3C is a diagram showing a flow path of the purge medium G. FIG. 4 is a view of the periphery of the cover member of the blocking plate as viewed from the detection wave transmitting plate side in the second embodiment. FIG. 5A is a cross-sectional view of a main part of a detection device according to a third embodiment, which is similar to FIG. 3A. 5B is a view of the periphery of the cover member of the blocking plate shown in FIG. 5A as viewed from the detection wave transmitting plate side. Figure 6A is a diagram showing the structure of the first nozzle in the third embodiment, where (a) is a top view seen from the detection wave transmitting plate side, (b) is a view taken along the A-A arrow in (a), and (c) is a view taken along the B-B arrow in (a). FIG. 6B is a schematic diagram showing the reflection state of the detection wave M when the first nozzle shown in FIG. 6A is used, and is a cross-sectional view taken along CC in FIG. 6A(a). FIG. 6C is a schematic diagram showing the reflection state of the detection wave M when the first nozzle shown in FIG. 6A is used, and is a cross-sectional view taken along line DD of FIG. 6A(a). FIG. 7 is a cross-sectional view of a main part of a detection device according to a fourth embodiment, shown in accordance with FIG. 3A.

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

As shown in FIG. 1, iron ore, coke, lime, and other charge materials 20 are supplied into the blast furnace 1 by a chute 10. The chute 10 rotates in the direction indicated by the symbol R1 in the figure around the axis C of the blast furnace 1, and controls the falling position of the charge materials 20 by changing the inclination angle R2 relative to the axis C. The charge materials 20 that fall from the chute 10 are then piled up inside the blast furnace 1.

First Embodiment
First, the basic configuration of the detection device 100 will be described. An opening 2 is formed near the top of the blast furnace 1, and the detection device 100 is installed at the opening 2. As shown in Fig. 2, the detection device 100 includes a rotating plate 120 that rotates parallel to the opening 2 of the blast furnace 1 as indicated by the reference symbol Y, about a rotating shaft 110. The rotating plate 120 is an annular disk with an opening in the center, and the opening in the center of the rotating plate 120 is indicated by the reference symbol 121.

The rotating shaft 110 is cylindrical and houses an antenna 135 inside, which is attached concentrically with the opening 121 of the rotating plate 120. The antenna 135 is connected to a transmitting/receiving means 130 for transmitting the detection wave M via a waveguide 133. The waveguide 133 coincides with the axis of the rotating shaft 110. In addition, a dielectric lens 136 made of fluororesin or the like may be attached to the antenna surface of the antenna 135 in order to increase the directivity of the detection wave M.

A gear 112 is provided on the outer periphery of the rotating shaft 110, and a gear 155 of the motor 113 meshes with the gear 112. Therefore, by driving the motor 113, the rotating shaft 110 rotates as indicated by the symbol Y in the figure, and the rotating plate 120 rotates in the same direction as the rotating shaft 110 and parallel to the opening 2 of the blast furnace 1. The rotation of the motor 113 is detected by the encoder 150.

In the space below the rotating plate 120 and between it and the opening 2 of the blast furnace 1, a fixed angle reflector 138 and a variable angle reflector 140 are arranged to transmit and receive detection waves M into the furnace.

The fixed angle reflector 138 is a reflector whose reflecting surface has a fixed inclination angle of 45°, and is composed of a first fixed angle reflector 138A, a second fixed angle reflector 138B, and a third fixed angle reflector 138C. The first fixed angle reflector 138A faces the antenna surface of the antenna 135 (in the example shown in the figure, the dielectric lens 136) through the opening 121 of the rotating plate 120. The second fixed angle reflector 138B faces the first fixed angle reflector 138A, and the third fixed angle reflector 138C faces the second fixed angle reflector 138B. Therefore, as shown by the dashed line in the figure, the detection wave M transmitted from the antenna 135 is reflected by the first fixed angle reflector 138A and sent to the second fixed angle reflector 138B, and then reflected by the second fixed angle reflector 138B and sent to the third fixed angle reflector 138C. It is then reflected by the third fixed angle reflector 138C and sent to the variable angle reflector 140.

These first fixed angle reflector 138A, second fixed angle reflector 138B, and third fixed angle reflector 138C are attached to a fixed member (not shown) that hangs down from the rotating plate 120 toward the opening 2 of the blast furnace 1, or to the side wall 170 (see FIG. 2).

It is preferable to use microwaves or millimeter waves as the detection wave M because the inside of the furnace is hot and dust, water vapor, etc. are present. In particular, millimeter waves are more preferable because they have a shorter wavelength than microwaves and are highly directional.

The angle-variable reflector 140 is a reflector in which the inclination angle of the reflecting surface 140a can be changed in the direction indicated by the symbol X in the figure. In this angle-variable reflector 140, a first link 117a of a link mechanism 117 is connected to the center of the surface (back surface) opposite the reflecting surface 140a, and a second link 117b is connected to the first link 117a. In addition, a connecting rod 114 that penetrates the inside of the rotating shaft 110 through an opening 121 of the rotating shaft 110 is connected to the second link 117b, and a rack gear 118 is formed on the end of the connecting rod 114 opposite the second link 117b.

The connecting rod 114 has an outer tube section 114a with an inner tube being a waveguide 133 that connects the antenna 135 and the transmitting/receiving means 130, and a rack gear 118 is formed on the outer circumferential surface of the outer tube section 114a. A gear 119 of the motor 125 meshes with this rack gear 118, and by driving the motor 125, the gear 119 rotates, which is converted into linear motion by the rack gear 118. An encoder 126 is connected to the motor 125, and the amount of rotation of the motor 125 and further the amount of rotation of the gear 119 are detected.

The connecting rod 114 also has an intermediate section 114b that extends toward the rotating plate 120 inside the rotating shaft 110 to avoid the antenna 135. The end of the outer tube section 114a on the rotating shaft 110 side is bent outward, and the intermediate section 114b is continuous with this bent section.

Furthermore, the middle portion 114b has a lower end portion 114c that extends through the opening 121 of the rotating plate 120 to the opening 2 of the blast furnace 1. This lower end portion 114c is connected to the second link 117b of the link mechanism 117.

The connecting rod 114 is configured in this way, and the rotation of the motor is converted into linear motion by the rack gear 118 via the gear 119, and the connecting rod 114 moves linearly to the side of the angle-variable reflector 140 or to the opposite side, as indicated by the symbol H in the figure.

Support shafts 141, 141 protrude from both diametrical ends of the angle-variable reflector 140, and the support shafts 141, 141 are attached to a support arm holding rod 145 attached to the rotating plate 120.

When the connecting rod 114 moves toward the angle-variable reflector 140 (downward in the figure), the reflective surface 140a of the angle-variable reflector 140 is tilted via the link mechanism 117 so that it faces the radial direction of the blast furnace 1, and when the connecting rod 114 moves away from the angle-variable reflector 140 (upward in the figure), the reflective surface 140a of the angle-variable reflector 140 is tilted via the link mechanism 117 so that it faces the axis C of the blast furnace 1. In other words, the descent and ascent of the connecting rod 114 can change the inclination of the reflective surface 140a of the angle-variable reflector 140 in the direction of the symbol X in the figure.

The detection wave M sent from the third fixed angle reflector 138C of the fixed angle reflector 138 to the variable angle reflector 140 is deflected left and right in the figure as indicated by the symbol Z through the opening 175, and is sent into the furnace in the form of a line along the radial direction of the rotating plate 120. The detection wave M is then reflected by the surface of the charge 20 piled up in the furnace, and is received by the transmitting/receiving means 130 following the same path as when it was transmitted. The transmission and reception can be performed, for example, by the FM-CW method.

By transmitting and receiving this linear detection wave M while rotating the rotating plate 120 around the rotating shaft 110, distance information can be obtained in a circular scanning area that covers the entire interior of the blast furnace 1.

The above describes the basic configuration of the detection device 100 shown in Figures 1 and 2. For further details, please refer to, for example, Patent Document 1.

Next, the technical features of the present invention will be described. Fig. 3A is a cross-sectional view showing the case where the present invention is applied to the detection device 100 shown in Fig. 2, and is a cross-sectional view of a main part showing the periphery of the opening 2 of the blast furnace 1 in the detection device 100. Fig. 3B is a view of the periphery of the cover member 215 of the blocking plate 210 shown in Fig. 3A, as viewed from the detection wave transmitting plate 200 side.

As shown in Figure 2, an opening 175 for transmitting and receiving the detection wave M is formed on the bottom surface of the cylindrical side wall 170, which houses the fixed angle reflector 138 and the variable angle reflector 140 of the detection device 100, on the blast furnace 1 side, and the opening 175 of the side wall 170 is parallel to the rotating plate 120.
In the present invention, as shown in FIG. 3A, the opening 175 of the side wall 170 is closed with a detection wave transmitting plate 200 made of a heat-resistant material, such as a quartz glass plate, that transmits the detection wave M.

As shown in FIG. 2, the rotating plate 120 and the side wall 170 are integrated, so the side wall 170 rotates in the Y direction together with the rotating plate 120. Therefore, the detection wave transmitting plate 200 attached to the opening 175 of the side wall 170 also rotates in the same direction as the rotating shaft 110, i.e., in the Y direction, with the center of the opening 175 of the side wall 170 as its axis. That is, as shown in FIG. 3A, the detection wave transmitting plate 200 rotates in the Y direction with the center of the opening 175 as its axis, while maintaining parallelism with the opening 2 of the blast furnace 1.

The bottom of the casing 180 that surrounds the entire detection device 100 on the blast furnace 1 side is inserted into the opening 2 of the blast furnace 1. The casing 180 is a cylindrical member with an opening at the bottom. This opening is indicated by the reference symbol 185.

A blocking plate 210 is arranged below the opening 185 of the casing 180 on the blast furnace 1 side. In the example shown in the figure, the blocking plate 210 is of the so-called "swing type." The swing type blocking plate 210 is formed of a cover member 215 shaped to cover the entire opening 185 of the casing 180, and a support member 217 connected to one end of the cover member 215, and has an overall L-shaped cross section.

The other end of the support member 217 is connected to a rotating shaft 220, and the blocking plate 210 rotates around the rotating shaft 220 as shown by an arrow S in the figure. The blocking plate 210 is rotated by operating a cylinder 300.
In this embodiment, the L-shaped cross section of the swing-type blocking plate 210 does not necessarily have to be strictly L-shaped, and as long as it does not interfere with the mechanism of the blocking plate 210 described below, it also includes, for example, a cross section in which the cover member 215 and the support member 217 are not strictly perpendicular, i.e., a cross section that is approximately L-shaped.

In addition, because the blocking plate 210 is a swing type, the opening diameter of the opening 2 of the blast furnace 1 is large as a range of motion of the support member 217. Therefore, a cover 190 for closing the opening 2 is attached to the outside of the casing 180.

A first nozzle 230 is attached to the cover member 215 of the blocking plate 210. The first nozzle 230 is connected to a supply source (not shown) of purging medium G through a pipe 240. The pipe 240 rotates together with the blocking plate 210 as indicated by the arrow S in the figure. A plurality of first nozzles 230 (five in the example shown) are arranged linearly along the radial direction of the detection wave transmitting plate 200, and are housed in a first nozzle opening 218 formed in the cover member 215. Note that the first nozzle 230 may be a single nozzle as long as it can cover the entire radial portion of the detection wave transmitting plate 200.

The first nozzle 230 can also be configured as a "two-split configuration" of 230A and 230B, as shown in Figures 3A and 3B. By configuring it as a two-split configuration, the supply amount of the purging medium G can be increased. If necessary, it may be configured as multiple pieces, such as three or more split configurations, rather than just a two-split configuration. Note that if the first nozzle 230 is a long hole that can cover the entire radius portion of the detection wave transmission plate 200, it does not necessarily have to be split.

Then, the purging medium G is ejected (sprayed) from the lower side of FIG. 3A from each first nozzle 230 (230A, 230B) toward the surface 201 of the detection wave transmitting plate 200 on the blast furnace 1 side. The ejected purging medium G is discharged through the gap D between the cover member 215 of the blocking plate 210 and the end of the casing 180. Note that the gap D can be set arbitrarily, but by increasing this gap D, the ejection amount of the purging medium G can be increased. Note that the direction in which the purging medium G is ejected toward the surface 201 of the detection wave transmitting plate 200 on the blast furnace 1 side does not necessarily have to be perpendicular to the surface 201 of the detection wave transmitting plate 200 on the blast furnace 1 side, and may be slightly deviated from the perpendicular angle to the surface 201 of the detection wave transmitting plate 200.

As the purge medium G, for example, an inert gas such as nitrogen gas (N ₂ ), air, water, water vapor, etc. can be used, with an inert gas being preferred.

Figure 3C is a diagram showing the flow path of the purge medium G, and is a diagram showing the state in which the opening 185 is covered with the cover member 215 of the blocking plate 210, viewed from the side of the support member 217 of the blocking plate 210. The rotating shaft 220 used to rotate the cover member 215 of the blocking plate 210 has a hole 221 through which the purge medium G flows, and is inserted into a gland packing housing 502 to prevent gas inside the blast furnace from flowing out from the outer periphery of the rotating shaft 220 even when the rotating shaft 220 rotates. The outer periphery of the gland packing housing 502 is welded to the cover 190 to prevent blast furnace gas from flowing out. As shown by the thick line in the figure, the purge medium G from the supply source of the purge medium G (not shown) flows into the hole 221 through the rotating joint 501 from both ends of the rotating shaft 220, and is sprayed from the first nozzle 230A (230B) through the piping 240.

The configuration of the surface profile detection device for the charge inside the blast furnace according to this embodiment is as described above. When measuring the surface profile of the charge 20, the shield plate 210 is raised to the side of the opening 2, as shown by the dotted line in Figure 3A, to expose the opening 2.
When measuring the surface profile of the contents in the blast furnace, dust from the blast furnace 1 adheres to the surface 201 of the detection wave transmission plate 200. In order to remove the adhered dust, the blocking plate 210 is rotated by the cylinder 300, the opening 185 of the casing 180 is covered with the cover member 215, and the purging medium G is sprayed from the first nozzle 230 toward the surface 201 of the detection wave transmission plate 200. The first nozzles 230 are arranged linearly along the radius of the detection wave transmission plate 200, that is, along the radial direction, but since the detection wave transmission plate 200 rotates in the Y direction, the purging medium G from the first nozzle 230 is sprayed onto the entire surface of the surface 201 of the detection wave transmission plate 200. Therefore, by this removal operation, the dust adhering over the entire surface of the surface 201 of the detection wave transmission plate 200 can be removed. The removed dust is discharged into the furnace through the gap D.
In addition, even when the cover member 215 of the blocking plate 210 is raised toward the opening 2 to expose the opening 2, the purging medium G can be sprayed from the first nozzle 230 during measurement, thereby allowing the detection device 100 to be cooled.

Second Embodiment
In the first embodiment described above, the blocking plate 210 was of a swing type, but as shown in Fig. 4, the cover member 215 of the blocking plate 210 can be made to rotate in parallel with the opening 2 of the blast furnace 1 to cover the surface 201 of the detection wave transmitting plate 200, which is a so-called "rotating type". The cover member 215 rotates in the T direction in the figure with a rotation shaft 225 as a fulcrum, and is in the position shown by the two-dot chain line during measurement, and when the cover member 215 covers the detection wave transmitting plate 200 (not shown), it rotates and moves to the position shown by the solid line. As in the first embodiment, the cover member 215 is accompanied by a first nozzle 230, but only the cover member 215 is shown in Fig. 4.

A purging medium G is supplied to the rotating shaft 225 through a hole (not shown) similar to that in the first embodiment, and is sent to the first nozzle 230 (not shown) through the inside of the rotating shaft 225 and the piping 240.

Third Embodiment
In the first embodiment described above, the first nozzle 230 is attached to the blocking plate 210 and rotates together with the blocking plate 210 to cover the detection wave transmission plate 200. However, in the third embodiment, as shown in Figs. 5A and 5B, instead of being attached to the cover member 215 of the blocking plate 210, the first nozzle 230 can also be attached to a fixed portion (not shown) provided on the blast furnace 1 so as to protrude into the opening 2 of the blast furnace 1. The first nozzles 230 are arranged linearly and protrude from the opening 2 so as to correspond along the radius of the detection wave transmission plate 200, as in the first embodiment. In addition, the cover member 215 of the blocking plate 210 is rotated in a swing-like manner in the S direction in the figure by rotating the rotating shaft 600 connected to the cylinder 300, and opens and closes the opening 185 of the casing 180. In addition, the rotating shaft 600 is a member for rotating the cover member 215 of the blocking plate 210, and is not configured to circulate the purge medium G inside, as in the rotating shaft 220 in the first embodiment.

Although not shown, the opening 185 of the casing 180 can be opened and closed by rotating the cover member 215 of the blocking plate 210 in a sliding manner, as in the second embodiment described above.

The first nozzle 230 is connected to a pipe 250 that is connected to a supply source (not shown) of the purging medium G, and the purging medium G is sprayed from the first nozzle 230 from below toward the surface 201 of the detection wave transmitting plate 200 on the blast furnace 1 side.

In this third embodiment, in order to remove dust particles adhering to the surface 201 of the detection wave transmission plate 200 during measurement, the opening 185 of the casing 180 is covered with the cover member 215 of the blocking plate 210, and the purge medium G is sprayed from the first nozzle 230 toward the surface 201 of the detection wave transmission plate 200, as in the first embodiment.

In the third embodiment, the first nozzle 230 is attached to a fixed part provided on the blast furnace 1 and protrudes from the opening 2, rather than to the cover member 215 of the blocking plate 210, and constantly blocks the detection wave M. This may have a significant effect on the transmission and reception of the detection wave M when measuring the surface profile of the charge 20. In order to suppress the effect on transmission and reception, it is preferable to configure the first nozzle 230 as shown in FIG. 6A, for example.

6A (a) is a top view of the first nozzle 230 as viewed from the detection wave transmitting plate 200, (b) is a view as viewed from the arrow A-A in (a), and (c) is a view as viewed from the arrow B-B in (a). As shown in the figures, each first nozzle 230 is composed of a protruding part 230c that protrudes from a main body part 230a made of a circular pipe (circular tube) and gradually widens toward an ejection port (ejection port) 230b of the purge medium G. In addition, the main body part 230a is connected to the piping 250 shown in FIG. 5A, and the piping 250 is attached to a fixed part of the blast furnace 1.
The ejection port 230b is for ejecting the purging medium G to the outside, and the main body 230a and the protruding portion 230c are for introducing the purging medium G into the ejection port 230b.

6B is a cross-sectional view taken along the line CC in FIG. 6A(a), and FIG. 6C is a cross-sectional view taken along the line D-D in FIG. 6A(a). In the detection wave M that passes through the detection wave transmitting plate 200 and enters the first nozzle 230, a part of the detection wave M is reflected by the nozzle outlet 230b at the tip of the nozzle in the same direction as the incident direction, as shown by a solid line in FIG. 6B. This reflected wave in the same direction as the incident direction interferes with the detection wave M that passes through the detection wave transmitting plate 200, and attenuates the transmission intensity of the detection wave M transmitted from the transmitting/receiving means 130. Therefore, in order to reduce the detection wave M reflected by the nozzle outlet 230b, it is sufficient to reduce the opening area of the nozzle outlet 230b. For example, the nozzle outlet 230b is arranged linearly along the main body 230a, and the opening shape of the nozzle outlet 230b is made horizontally elongated with the longitudinal direction of the main body 230a as the major axis, as shown in FIG. 6A(a). The shorter the minor axis of the nozzle 230b, the less the detection wave M reflected by the nozzle 230b can be.
Furthermore, as shown by the solid line in FIG. 6C, between the nozzles 230b, the detection wave M is reflected by the outer circumferential surface of the main body 230a, and a part of it is reflected in the same direction as the incident direction.
In this way, a portion of the detection wave M is reflected linearly along the longitudinal direction of the main body portion 230a.

On the other hand, the other detection waves M are reflected in various directions by the outer peripheral surface of the main body 230a, as shown by the dashed lines in Figures 6B and 6C.

As described above, by making the detection waves reflected in the same direction as the incident direction less than the detection waves reflected in a direction different from the incident direction, the influence of the reflected waves from the first nozzle 230 protruding into the opening 2 of the blast furnace 1 can be substantially eliminated.

Fourth Embodiment
As shown in Fig. 7, a second nozzle 260 can be further added to spray the purging medium G laterally toward the surface 201 of the detection wave transmitting plate 200 on the blast furnace 1 side, that is, from a direction horizontal to the surface direction of the detection wave transmitting plate 200. By combining the fourth embodiment with the first embodiment, during measurement, the second nozzle 260 sprays the purging medium G through the opening 185 of the casing 180, and can suppress adhesion of dust from the blast furnace 1 to the surface 201 of the detection wave transmitting plate 200, and during non-measurement, the blocking plate 210 is closed, and the purging medium G is sprayed from the first nozzle 230 toward the surface 201 of the detection wave transmitting plate 200, and dust attached to the surface 201 can be removed, so that dust adhesion to the surface 201 can be reliably prevented.

In the first to fourth embodiments, the timing for removing dust particles adhering to the surface 201 of the detection wave transmitting plate 200 can be determined as follows, in addition to periodically stopping measurement (i.e., when not measuring).

For example, the reception intensity can be monitored, and when dust adheres to the detection wave transmission plate 200 and the reception intensity of the reflected wave from the blocking plate 210 falls below a predetermined threshold, the purging medium G can be ejected from the first nozzle 230.

1 Blast furnace 2 Opening 100 Detection device (surface profile detection device for blast furnace contents)
110 Rotating shaft 113 Motor 114 Connecting rod 117 Link mechanism 120 Rotating plate 130 Transmitting/receiving means 135 Antenna 138 Fixed angle reflector 138A First fixed angle reflector 138B Second fixed angle reflector 138C Third fixed angle reflector 140 Variable angle reflector 170 Side wall 175 Opening 180 Casing 185 Opening 200 Detection wave transmitting plate 201 Blast furnace side surface (of detection wave transmitting plate) 210 Blocking plate 215 Cover member 220 Rotating shaft 225 Rotating shaft 230 First nozzle 240 Pipe 250 Pipe 260 Second nozzle 300 Cylinder G Purge medium M Detection wave

Claims (13)

A detection device for detecting a surface profile of a charge material such as iron ore, coke, or lime in a blast furnace, the detection device transmitting a detection wave toward a surface of the charge material accumulated in the furnace through an opening in the blast furnace and receiving the detection wave reflected by the surface of the charge material,
a detection wave transmitting plate that closes an opening for transmitting and receiving the detection wave of the detection device and rotates about an axis of the center of the opening while maintaining approximately parallelism with the opening of the blast furnace;
a blocking plate covering the detection wave transmitting plate;
A first nozzle is disposed between the detection wave transmitting plate and the blocking plate, and ejects a purge medium from below toward a surface of the detection wave transmitting plate on the blast furnace side.
The dust floating in the furnace, entering through the opening of the blast furnace and adhering to the surface of the detection wave transmitting plate on the blast furnace side is removed by spraying the purging medium from the first nozzle.
A device for detecting the surface profile of blast furnace interior charges. The blocking plate can open and close the opening of the blast furnace, and
The first nozzle is attached to the blocking plate.
The surface profile detection device for a blast furnace load according to claim 1. The purge medium is supplied to the first nozzle through a hole leading to an inside of a rotating shaft for opening and closing the blocking plate.
The surface profile detection device for a blast furnace load according to claim 2. The first nozzle is attached to a fixed portion provided on the blast furnace, not to a cover member of the blocking plate, so as to protrude from the opening of the blast furnace.
The surface profile detection device for a blast furnace load according to claim 1. The first nozzle has an ejection port for ejecting the purge medium to the outside and a main body for introducing the purge medium into the ejection port,
The nozzle has a horizontally elongated opening shape arranged along the longitudinal direction of the main body.
The surface profile detection device for a charge in a blast furnace according to claim 4. The axial direction of the main body is disposed in a radial direction of the detection wave transmitting plate.
The surface profile detection device for a blast furnace load according to claim 5. a detection wave reflected in a direction same as the incident direction of the detection wave incident on the first nozzle and the main body portion is smaller than a detection wave reflected in a direction different from the incident direction of the detection wave incident on the first nozzle and the main body portion.
The surface profile detection device for a charge in a blast furnace according to claim 5 or 6. Further provided is a second nozzle for ejecting a purge medium from a horizontal direction of the opening of the blast furnace against the surface of the detection wave transmitting plate facing the blast furnace,
The ejection of the purge medium from the first nozzle and the ejection of the purge medium from the second nozzle are performed in combination.
The surface profile detection device for a blast furnace load according to any one of claims 1 to 6. Further provided is a second nozzle for ejecting a purge medium from a horizontal direction of the opening of the blast furnace against the surface of the detection wave transmitting plate facing the blast furnace,
The ejection of the purge medium from the first nozzle and the ejection of the purge medium from the second nozzle are performed in combination.
The surface profile detection device for a blast furnace load according to claim 7. When the dust adheres to the detection wave transmitting plate and the received intensity of the reflected wave from the blocking plate falls below a predetermined threshold, the purge medium is ejected from the first nozzle toward the detection wave transmitting plate.
The surface profile detection device for a blast furnace load according to any one of claims 1 to 6. When the dust adheres to the detection wave transmitting plate and the received intensity of the reflected wave from the blocking plate falls below a predetermined threshold, the purge medium is ejected from the first nozzle toward the detection wave transmitting plate.
The surface profile detection device for a blast furnace load according to claim 7. When the dust adheres to the detection wave transmitting plate and the received intensity of the reflected wave from the blocking plate falls below a predetermined threshold, the purge medium is ejected from the first nozzle toward the detection wave transmitting plate.
The surface profile detection device for a blast furnace load according to claim 8. When the dust adheres to the detection wave transmitting plate and the received intensity of the reflected wave from the blocking plate falls below a predetermined threshold, the purge medium is ejected from the first nozzle toward the detection wave transmitting plate.
The surface profile detection device for a blast furnace load according to claim 9.

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