JP2006112966A - Method and apparatus for measuring surface shape of charged material in blast furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for measuring the surface shape of a charged material in a blast furnace, capable of accurately measuring the surface shape of the charged material as a whole for a short time, which has been charged into the blast furnace and is in a reposed state. <P>SOLUTION: A laser range finder 12 which can rotate or stop at an angle pitch of 0.2-2 degrees on a two-dimensional plane (horizontal plane) and scan a laser beam 11, in a range of 0-180 degrees on a two-dimensional plane (vertical plane) at each stop position, is disposed at a furnace wall 4 located below a charging device 3 at the blast furnace top section. After an elapse of 30-90 seconds, after charging the material to be charged in the furnace, the laser beam is scanned on the two-dimensional plane (vertical plane) at each stop position on the two-dimensional plane (horizontal plane), and the values of the distance from a deposition surface 13f of the charged material 13 in the furnace are measured at an angle pitch of 0.2-2 degrees; and then the three-dimensional shape of the surface of the charged material in the furnace is estimated (determined) from these measured results, the angles of these measurement points on the two-dimensional plane (vertical plane) and angles in relation to respective stop positions on the two-dimensional plane (horizontal plane). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for measuring the surface shape of a blast furnace interior charge and a measuring device for measuring the deposited surface shape of a charge such as iron ore (sintered ore) and coke charged from a raw material charge apparatus into a blast furnace furnace. It is about.

In blast furnace operation, conceptually, a raw material charging device installed at the top of the furnace causes iron ore (iron ore and sintered ore) and coke to be alternately charged into the ore layer and coke layer. Hot air is blown from the mouth to react with coke to produce CO gas, and iron ore is heated with this CO gas to reduce iron from iron oxide, and after forming a softened cohesive zone, iron droplets, that is, molten iron, It is dropped together with the slag produced as a by-product via the furnace core (coke layer) and collected at the bottom of the furnace.
In this blast furnace operation, it is difficult to directly observe the reaction behavior of various raw materials charged in the blast furnace, so in general, the change in the surface shape of the furnace interior that descends as the operation proceeds The condition of the furnace is determined by measuring the flow rate / velocity of the gas flow rising from each part of the charge accumulation surface, temperature, component distribution, etc. by the detection end charged in the furnace, and the hot air blowing conditions In addition, ore and coke charging conditions (such as iron ore and coke layer thickness ratio, charging amount, particle size distribution in the furnace radial direction, charging distribution, etc.) are being adjusted.

In particular, in order to maintain stable operation of the blast furnace, it is important to control the flow rate / velocity, temperature, components, etc. of the gas flow rising from each part of the furnace interior entry to an appropriate range. It is necessary to manage the deposit surface shape of the inclusion within an appropriate range.
In the bell-type blast furnace, it is common to adjust the dropping trajectory of the raw material falling from the bell with a movable armor as the shape of the deposit surface of the furnace interior.
In the case of a bell-less blast furnace, the deposition surface shape is formed into a mortar shape or a flat shape by changing and adjusting the inclination angle of the turning chute.
In order to adjust the deposition surface shape of the furnace interior charge to a preferable shape, it is important to grasp the deposition surface shape of the charge in the furnace, and various proposals have been conventionally made.

For example, Patent Document 1 uses a microwave type or laser type profile meter to measure the depth to the deposition layer surface of the raw material inside the furnace at the top of the blast furnace at arbitrary intervals along the furnace radial direction, It is disclosed that the depth data obtained by the measurement is smoothed and subjected to a first-order approximation process based on the center difference to remove noise and accurately obtain the terrace length by computer processing.
However, in this method, the inclination angle to the deepest part and the terrace and the terrace length are calculated in one direction in the radial direction of the furnace, and the profile of the raw material deposition layer surface in the entire furnace cannot be calculated. In addition, since the microwave profile meter is moved to the furnace center, the time required for measurement becomes longer, and the surface shape of the raw material deposition layer changes at the start and end of measurement, resulting in a decrease in measurement accuracy. There is. There is also a problem that the heat load on the microwave profile meter is increased by the high-temperature furnace gas.

In Patent Document 2, a measurement lance is inserted from the side of the furnace port toward the axis of the blast furnace, and the distance to the charge surface is measured by distance measuring means (here, using microwaves) housed in the lance. And measuring the profile of the charge surface.
This measurement method measures within the range from the side of the furnace port to a length of 1.25 times the radius of the furnace port, and accurately detects the eccentricity from the axis of the minimum point of the central part of the deposited charge. It is possible to constantly track the circumferential balance of the charge and the presence or absence of eccentricity, accurately grasp the profile change of the charge surface, and prevent the blast furnace from deteriorating in the blast furnace and stabilize the blast furnace operation. . In addition, since the center of the charge can be grasped in a planar shape by measuring the circular range with the radius of 0.25 times the furnace port radius centered on the blast furnace axis, It is said that the eccentricity of the minimum point of the surface coordinate can be detected more accurately.
However, in this method, the measurement lance is inserted from the side of the furnace port toward the axis of the blast furnace, and the length range of 1.25 times the radius of the furnace port in the furnace radial direction is measured. This is to measure a circular range having a length of 0.25 times as the center, and cannot accurately calculate the shape of the surface of the raw material deposition layer in the entire furnace. In addition, since the microwave profile meter is housed in the lance and moved to the furnace center, the time required for measurement becomes longer, and the surface shape of the raw material deposition layer changes at the start and end of measurement. There is a problem that decreases. There is also a problem that the heat load on the microwave profile meter becomes large.

Further, in Patent Document 3, an infrared camera equipped with a high-magnification zoom lens and an autofocus mechanism is installed at a fixed position outside the furnace through a shut-off glass and a gate valve. It is disclosed that the surface profile of the furnace interior is measured by combining the in-focus distance data obtained from the autofocus mechanism and the scan position data obtained from the electric pan head, and processing the data.
In this measurement method, the entire interior of the furnace can be observed, and the profile of the entire surface of the furnace interior can be measured.
However, in this measurement method, the area inside the furnace is scanned by an infrared camera installed at a fixed position outside the furnace through a shut-off glass and a gate valve, and a high-power zoom lens is used and the position is located outside the furnace. However, in a furnace with a lot of airborne dust, it is inevitable that the influence of airborne dust is large and the measurement accuracy is greatly reduced. In particular, in the furnace state immediately after charging the raw material, the influence of suspended dust is significant. In addition, there is a problem that the time required for measurement becomes long, the surface shape of the raw material deposition layer changes at the measurement start time and the measurement end time, and the measurement accuracy decreases.
JP 2003-73716 A JP 2002-115008 A Japanese Patent Laid-Open No. 10-103934

  The present invention is a surface shape of a blast furnace interior charge that can measure a surface shape of a blast furnace interior charge with high accuracy in a short time, with respect to a deposited surface shape of the charge charged in a blast furnace and in a repose state. A measuring method and a measuring apparatus are provided.

The present invention is summarized as the following (1) to (4) in order to advantageously solve the above problems.
(1) A laser capable of repeatedly rotating and stopping on a two-dimensional plane in the horizontal direction on the furnace wall section under the charging device at the top of the blast furnace, and performing laser beam scanning on the two-dimensional plane in the vertical direction at each stop position A distance meter is installed in the furnace so that it can be moved back and forth. After the raw material is charged into the furnace from the raw material charging device, the vertical direction two-dimensional plane is displayed at each stop position on the horizontal two-dimensional plane. Is scanned with a laser beam, and the distance to the deposition surface of the furnace interior is measured at an angle pitch of 0.2 to 2 degrees, and the measured value and the angle of the measurement point on the two-dimensional plane in the vertical plane direction and the horizontal A method for measuring the surface shape of an interior of a blast furnace interior, wherein a three-dimensional shape of the entire deposition surface of the interior of the furnace interior is obtained from an angle to each stop position on a two-dimensional plane in the direction.
Here, when the angular pitch on the two-dimensional plane in the vertical direction (hereinafter referred to as “two-dimensional plane (vertical plane)”) is less than 0.2 degrees, the measurement point density becomes larger than necessary. If it exceeds 2 degrees, the density of measurement points is insufficient in a region far from the laser distance meter, and the measurement accuracy cannot be secured stably.
The angular pitch of rotation / stop on the horizontal two-dimensional plane (hereinafter referred to as “two-dimensional plane (horizontal plane)”) is preferably selected in the range of 0.2 to 2 degrees. If it is less than 0.2 degrees, the measurement point density is larger than necessary, and the time required for measurement in the entire furnace becomes longer. Therefore, there is a concern that the accumulation shape of the furnace interior greatly changes over time during the measurement and the measurement accuracy decreases. . In addition, the heat load on the measuring device increases. If it exceeds 2 degrees, the measurement point density is insufficient in a region far from the laser distance meter, and the measurement accuracy cannot be secured stably.
As for the measurement timing of the deposited surface shape, in normal operation, if the charge is charged into the furnace, the flow of the furnace internal charge and the fullness of the dust in the furnace are significant at the initial stage. Measurement accuracy cannot be obtained. However, if the start of measurement is delayed, the time from the completion of charging the charge to the end of the measurement becomes longer, and the time-dependent change in the shape of the deposited surface of the charge becomes noticeable, and the target charge distribution is accurately measured. Can not do it. In order to eliminate this concern, it is preferable to start the measurement within a range of 30 to 90 seconds while watching the data of the charge surface shape after charging the charge.

(2) The method for measuring the surface shape of a blast furnace interior entry according to (1), wherein the laser distance meter is moved in and out of the furnace from the furnace wall surface to a position in the furnace of 50 to 450 mm.
Here, when the laser distance meter (center) is in the furnace position less than 50 mm from the furnace wall surface, depending on the mesh displaying the measurement result, it may be difficult to measure the vicinity of the furnace wall surface on the laser distance meter installation side. is there. In addition, when it is in the furnace position more than 450 mm from the furnace wall surface, the moving distance of the laser distance meter becomes long and the time required for measurement becomes long. It is impossible to accurately measure the charging distribution. Moreover, the thermal load with respect to apparatus and apparatus parts, such as a laser distance meter, becomes large and is not preferable.
In the present invention, in order to satisfy such conditions, the installation height of the laser distance meter and the position in the furnace are taken into account according to the furnace diameter, the reference charging level of the furnace interior contents, and the deposition surface shape.
(3) In the method (1) or (2), a plurality of the laser distance meters are arranged to share the measurement area of the deposition surface of the furnace interior material, and the surface shape measurement method for the blast furnace interior material .

(4) A space part that can be cut off and communicated with the inside of the furnace by a shielding device is provided in the furnace wall part under the raw material charging device at the top of the blast furnace furnace, and a slide arm that can move forward and backward in the furnace is provided in this space part. The fixed base and the tip of the slide arm are disposed at the tip of the slide arm and can be rotated / stopped at a set angle pitch on the horizontal two-dimensional plane. At each stop position, the laser beam is scanned on the vertical two-dimensional plane at each set angle pitch. Each of the two-dimensional plane in the vertical direction by a laser distance meter that measures the distance to the charged material accumulation surface, a shielding device, a slide arm, a drive control device that controls the laser distance meter, and a laser distance meter in the furnace Processing the distance information to the charge accumulation surface at the measurement point, the angle information of each measurement point, and the angle information of each stop position on the horizontal two-dimensional plane, and processing the three-dimensional whole accumulation surface of the furnace interior charge Compile for finding and displaying shapes Profilometer of the blast furnace interior container, characterized in that it comprises a chromatography data.

According to the present invention, using a laser rangefinder with a laser beam scanning function that is not easily affected by dust floating in the furnace, the surface of the furnace charge is placed on a two-dimensional plane (vertical surface) with a laser beam. In addition, it is possible to scan on a two-dimensional plane (horizontal plane), and it is possible to accurately measure the surface shape of the entire furnace interior inclusion deposition surface.
In addition, the distance traveled by the laser rangefinder is minimized, and it can be measured in a few seconds on the entire area including the two-dimensional plane (horizontal plane) in a few seconds on the two-dimensional plane (vertical plane). Immediately after charging the charged material, it starts within the range of 30 to 90 seconds, and the entire measurement can be completed while the deposition shape does not change greatly.
Moreover, although the tip of the measuring device including the laser distance meter faces the furnace, the thermal load caused by the high-temperature furnace gas on each part can be greatly reduced, and the life of the measuring device can be extended.

The present invention will be described with reference to FIGS.
FIG. 1 conceptually shows an example of the structure of the surface shape measuring apparatus for the interior of a blast furnace interior according to the present invention applied to a bell type blast furnace and a laser beam scanning example on a two-dimensional plane (vertical plane) from a laser distance meter. FIG. 2 is a side sectional explanatory view, and FIG. 2 is a partial plan explanatory view conceptually showing an example of laser beam scanning in the furnace wall inner circumferential direction from the laser distance meter in FIG.
As shown in FIG. 1, the surface shape measuring apparatus 1 for the blast furnace interior entrance of the present invention used here was installed on the furnace wall 4 below the large bell 3 of the raw material charging apparatus at the top of the blast furnace 2. It is installed in a manhole 6 provided with a heat-resistant shielding device 7 that can be opened and closed to shield the inside of the furnace 5. The furnace diameter of this installation site is about 11 m.

  In this example, a reference position on a two-dimensional plane (horizontal plane) is determined by a fixed base 8 having a slide arm 9 that can move forward and backward from the furnace wall 4 to the furnace 5 and the tip of the slide arm moved into the furnace. And a rotary table 10 that can rotate within a range of 0 to 360 degrees and can be stopped at an arbitrary angle pitch (β), and is supported by the rotary table and rotates together with the rotary table 10 (rotation center 12c) to form a two-dimensional plane (horizontal plane). ) Can be scanned with a laser beam 11 within a range of 0 to 360 degrees, and the deposition surface 13f of the furnace interior charge 13 within a range of 0 to 180 degrees on a two-dimensional plane (vertical plane) at the stop position. Is scanned with a laser beam 11 at an arbitrary angular pitch (α), and a distance Lx from the rotation center c (vertical surface) to a plurality of measurement points x on the deposition surface 13f of the furnace interior charge 13 is measured. With a heat-resistant glass (not shown) A built-in laser rangefinder 12 is provided.

The horizontal plane Bf at the position level of the rotation center c of the laser distance meter 12 is below the position of the lower surface of the large bell 3, here, about 2 m above the uppermost surface level st of the deposition surface of the furnace interior charge 13. The heat-resistant shielding device 7, the slide arm 9, the turntable 10, and the laser distance meter 12 are each provided with a drive device (not shown), and this drive can be controlled by the drive control device 15, and the raw material charging device is charged. It can be driven in conjunction with the operation.
Further, the laser distance meter 12 and the turntable 10 are processed through the signal processing device 16 to process each information from the laser distance meter 12 and the turntable 10 to obtain a three-dimensional shape of the deposition surface 13f of the furnace interior entrance 13. Is connected to a computer 14 for displaying and displaying the information.

The rotating table 10 that rotates while supporting the laser distance meter 12 is moved by a distance L (here, the center of rotation 12c from the inner peripheral surface of the furnace wall portion 4 on the installation side of the surface shape measuring device by the movement of the slide arm 9). In this case, the laser distance meter 12 supported by the turntable 10 is 0 on the two-dimensional plane (vertical plane) with the laser beam 11 from the rotation center c as shown in FIG. The distance Lx to the deposition surface 13f of the furnace interior charge 13 is measured at a plurality of measurement points with an angular pitch (α) within a range of ˜180 degrees.
This angular pitch (α) determines the measurement point density that affects the surface shape measurement accuracy on a two-dimensional plane (vertical surface). The smaller the pitch, the higher the measurement accuracy, but the shorter the time required for measurement. It is also important. As a condition for ensuring satisfactory measurement accuracy and required measurement time, it is preferable that a measurement point in a region far from the rotation center c of the laser distance meter 12, for example, a distance a between x1 and x2 is within a range of 100 mm or less. Here, 1 degree is selected as the angle pitch (α) that satisfies this condition.

On the other hand, as shown in FIG. 2, the laser distance meter 12 rotates a range of 360 degrees on the two-dimensional plane (horizontal plane) by the rotation of the turntable 10 at the position in the furnace (rotation center 12 c), and the angular pitch ( β) can be stopped at a plurality of positions, and at each stop position, the laser beam 11 scans within a range of 0 to 180 degrees on a two-dimensional plane (vertical plane) with an angular pitch (α), and a plurality of measurement points x The distance Lx to the deposition surface 13f of the furnace interior charge 13 is measured.
This angle pitch (β) determines the density of measurement points that affects the surface shape measurement accuracy in the two-dimensional plane (horizontal plane) direction, and is a measurement point in a region far from the rotation center 12c of the laser rangefinder 12 such as y1 −. The distance b between y2 is preferably within a range of 100 mm or less. Here, 1 degree is selected as the angle pitch (β) that satisfies this condition.

Angle range (for example, a range of 0 to 360 degrees) from a rotation base point to a rotation end point on a two-dimensional plane (horizontal plane) of the turntable 10 (laser distance meter 12), a rotation speed, an angle pitch (β), and an angle pitch (β). Each stop time, the scanning base point of the laser beam 11 on the two-dimensional plane (vertical plane) of the laser rangefinder 12 (here, the 0 degree position at the horizontal plane Bf position at the same height level as the rotation center c of the laser rangefinder 12) ), Driving (scanning) conditions such as the angular range from the scanning base point to the scanning end point, the scanning speed and the angular pitch (α), and the stop time (about 0.5 seconds) for each angular pitch (α) are controlled by the computer 14 and the drive control. Settings can be controlled by the device 15.
Under this set condition, the turntable 10 is rotated to drive the laser distance meter 12, and the two-dimensional plane (horizontal plane) and the two-dimensional plane (vertical plane) with respect to the deposition surface 13f of the furnace interior 13 by the laser beam 11. The distance Lx from the rotation center c of the laser rangefinder 12 to each measurement point x on the deposition surface 13f of the furnace interior 13 is measured.
Angle information on the two-dimensional plane (horizontal plane) from the rotation base point of the laser distance meter 12, distance measurement information to each measurement point on the two-dimensional plane (vertical plane) by the laser beam 11 of the laser distance meter 12, and each measurement point Is processed by the signal processing device 16 and input to the computer 14, and the measurement result of the angle and the distance Lx of each measurement point x on the deposition surface 13f of the furnace interior charge 13 is determined by a preset calculation program. Thus, the vertical distance hx from the horizontal plane Bf to each measurement point is calculated, and the three-dimensional shape of the entire region of the deposition surface 13f of the furnace interior charge 13 is obtained and displayed.

With the surface shape measuring device for the blast furnace interior as shown in FIG. 1, after 30 seconds have elapsed after the charge is completely charged into the furnace from the raw material charging device (large bell) 3, the blast furnace interior is filled. The surface shape was measured.
In this embodiment, after 30 seconds have passed since the charged material was charged into the furnace, the opening of the shielding device 6 and the movement of the slide arm 9 were performed, and the position of the rotary table 10 (laser rangefinder 12). Is moved from the furnace wall portion 4 to a position in the furnace at a distance of L450 mm, and at this position, a range of 360 degrees on the two-dimensional plane (horizontal plane) from the position of the base point 0 degrees is rotated every angular pitch (β). The laser beam 11 scans the range of the scanning angle θ on the two-dimensional plane (vertical plane) (here, the range of 90 degrees from the position of 0 degrees to the position of 20 degrees as a base point) at each stop position. The distance Lx from the rotation center c of the laser rangefinder 12 to the deposition surface 13f of the furnace interior charge 13 is measured at each measurement point x for each angular pitch (α), and the distance to each measurement point x. From Lx and the base 0 degree position on the two-dimensional plane (vertical plane) of each measurement point From each angle, a vertical distance hx from each measurement point x to the horizontal plane Bf was obtained, and the three-dimensional shape of the entire deposition surface 13f of the furnace interior charge 13 was estimated (measured).
Here, the 360 ° region can be scanned in 4 minutes by setting the stop time for each angular pitch (β) in the furnace wall inner circumferential direction within 1.3 seconds, and scanning on a two-dimensional plane (vertical plane). The range of the angle θ (enlarged up to 180 degrees here) is scanned within the stop time for each angular pitch (β) on the two-dimensional plane (horizontal plane), and 3 of the entire deposition surface 13f of the furnace interior charge 13 is scanned. Each condition was set so that the dimensional shape could be measured in about 4 minutes.

The three-dimensional shape of the entire deposition surface 13f of the furnace interior charge 13 obtained in this example is conceptually as shown in FIGS. 3 (a), 3 (b), and 3 (c).
Here, FIG. 3A is an explanatory diagram showing a contour map by a plan view of the deposition surface 13f of the furnace interior charge 13, and FIG. 3B is a sectional explanatory view taken along the arrow Aa-Ab in FIG. (C) is a cross-sectional explanatory view taken along the line Ba-Bb of (a).
The numbers attached to a part of the contour lines in FIG. 3A indicate the distance (m) from the horizontal plane Bf of the position level of the rotation center c of the laser rangefinder 12.
(Experimental example)

In order to evaluate the estimation (measurement) result of the three-dimensional shape of the entire deposition surface 13f of the furnace interior charge 13 according to the present invention, the deposition surface shape similar to that shown in FIGS. And using the surface shape measuring apparatus 1 as shown in the examples, the same (however, the angle pitch (α) and the angle pitch (β) were set to 0.5 degrees) The three-dimensional shape of the surface was measured (estimated), and the result was compared with the actually measured value by another method.
Here, the other method is a distance measurement method (comparison method) using a device that measures the vertical distance from the horizontal plane Bf at the position level of the rotation center c of the laser rangefinder 12 according to the present invention to the measurement point x. The vertical distance according to the present invention was compared with the actual measurement value obtained by the comparison method at each measurement point selected from the measurement points according to the above.
As a result, the measured (estimated) value of the vertical distance according to the present invention was within an error range of ± 1.7% with respect to the actually measured value by the comparison method, and was sufficiently satisfactory.

The present invention is not limited to the above embodiments. In the above embodiment, it is applied to a bell type blast furnace, but it can also be applied to a bellless type blast furnace, not only in the case where the deposition surface shape of the furnace interior is a mortar shape, but also in other shapes such as a flat shape. This is also applicable to cases, and the optimum position of the installation position can be selected.
Also, the structure of the surface shape measuring device, the position of the laser rangefinder in the furnace, the laser beam scanning conditions (scanning angle range, scanning direction, scanning speed, angle pitch (α), (β), etc. that determine the measurement point density), The measurement time and the like vary depending on the type of the target blast furnace, the furnace top structure, the charging method, the charging conditions, the surface shape of the deposit in the furnace interior, and the like.

Side cross-section explanatory drawing which shows notionally the structural example of the surface shape measuring apparatus of the furnace interior entrance surface of the blast furnace of this invention, and the laser beam scanning example in the two-dimensional plane (vertical surface) from a laser rangefinder. FIG. 2 is a partial plan explanatory view conceptually showing a laser beam scanning example on a two-dimensional plane (horizontal plane) from the laser distance meter in FIG. 1. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows notionally the three-dimensional shape of the furnace interior entrance surface of the blast furnace obtained in the Example of this invention, (a) A figure is a contour-line explanatory drawing shown with a top view, (b) A figure is (a). Aa-Ab arrow section explanatory drawing of a figure, (c) A figure is Ba-Bb arrow cross-section explanatory drawing of (a) figure.

Explanation of symbols

1: Surface shape measuring device 2: Blast furnace 3: Raw material charging device (large bell) 4: Furnace wall part 5: In the furnace 6: Manhole 7: Shielding device 8: Fixing base 9: Slide arm 10: Turntable 11: Laser Beam 12: Laser distance meter 12c: Center of rotation (horizontal plane) 13: Missing number c: Center of rotation (vertical plane) 14: Computer 15: Drive control device 16: Signal processing device

Claims (4)

A laser rangefinder that can be rotated and stopped on a horizontal two-dimensional plane on the furnace wall under the charging device at the top of the blast furnace, and capable of laser beam scanning on the vertical two-dimensional plane at each stop position. A laser beam is installed on the two-dimensional plane in the vertical direction at each stop position on the two-dimensional plane in the horizontal direction after the raw material is placed in the furnace from the raw material charging device. Scan and measure the distance to the deposition surface of the furnace interior inclusions at an angle pitch of 0.2 to 2 degrees, and the measured value and the measurement point on the two-dimensional plane in the vertical plane direction and 2 in the horizontal direction. A method for measuring the surface shape of a blast furnace interior, wherein a three-dimensional shape of the entire deposition surface of the interior of the furnace interior is obtained from an angle to each stop position on a three-dimensional plane. The method for measuring the surface shape of a blast furnace interior entrance according to claim 1, wherein the distance of the laser rangefinder in the furnace is set to a position in the furnace of 50 to 450 mm from the furnace wall surface. The method for measuring a surface shape of a blast furnace interior entrance according to claim 1 or 2, wherein a plurality of the laser distance meters are arranged to share a measurement area of a deposition surface of the interior interior of the furnace interior. A space that can be shut off and communicated with the inside of the furnace by a shielding device is provided in the furnace wall under the raw material charging device at the top of the blast furnace furnace, and in this space, a fixed base having a slide arm that can be moved back and forth in the furnace, , Placed at the tip of the slide arm, can be rotated / stopped at a set angle pitch on a horizontal two-dimensional plane, and loaded at a set angle pitch by scanning a laser beam on the vertical two-dimensional plane at each stop position. At each measurement point on a vertical two-dimensional plane by a laser distance meter that measures the distance to the object deposition surface, a shield control device, a slide arm, a drive control device that controls the laser distance meter, and a laser distance meter in the furnace The distance information to the charge accumulation surface, the angle information of each measurement point, and the angle information of each stop position on the horizontal two-dimensional plane are processed to obtain the three-dimensional shape of the entire deposit surface of the furnace interior charge. Display the computer Profilometer of the blast furnace interior container, characterized in that there was e.

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