KR100949854B1 - Method of carrying bottom mantel for blast furnace - Google Patents

Abstract

In the conveying method of the furnace mantle which previously constructs a blast furnace mantle in places other than a blast furnace foundation, and constructs a brick in the said furnace mantle, and carries it to the blast furnace foundation, the bending amount of the brick upper surface constructed in a furnace is 1 m radius Carry it to 3 mm or less.

Balance beam, rug beam, nozer mantle, laser transmitter, laser receiver

Description

Transportation method of furnace mantle for blast furnace {METHOD OF CARRYING BOTTOM MANTEL FOR BLAST FURNACE}

This invention is the conveying method which builds a blast furnace body in advance in the place other than a blast furnace foundation, and conveys a blast furnace on the base after disassembly of an existing furnace body, and especially the blast furnace furnace which previously built bricks. The present invention relates to a transport method of a furnace mantle for a blast furnace, which carries the mantle to the blast furnace base.

At the time of conventional blast furnace repair, the old blast furnace (old blast furnace) is divided into small pieces and demolished from the blast furnace foundation. Then, a single bar-shaped bar is welded and welded one by one on the foundation to install a new blast furnace body. The construction method to build a brick inside, in other words, the construction method to build a new blast furnace was adopted from the beginning.

For this reason, the conventional construction method requires a long period of time to repair, and after the installation of the blast furnace body, the height of the operation to install a cooling device such as a stave cooler or cooling piping is required, a problem on the safety and security and construction quality. There was also.

On the other hand, in recent years, in order to shorten the construction period, a new blast furnace is divided into a plurality of ring-shaped blocks in another nearby place (ground assembly site) in parallel with the operation of the old blast furnace. After assembling, the blast furnace is completely dismantled from the foundation, and these blocks are brought in by using a heavy load transport trolley such as a dolly, mounted on a jack or a crane, and installed. The so-called block construction method which weld-joins and integrally integrates the steel bar, piping, etc. of a part is employ | adopted (for example, Unexamined-Japanese-Patent No. 47-1846, Unexamined-Japanese-Patent No. 09-143521, and Unexamined Japanese Patent Publication). 10-102778).

For example, Japanese Patent Laid-Open No. 47-1846 discloses that the blast furnace is divided into a bottom part, a bosh, an old part, an old chest part, an old part, and the like, and each of the divided parts is divided into respective parts around the blast furnace. A technique has been disclosed in which a moving scaffold is used to move in a transverse direction to be laminated one by one, combine all of them to be integrally formed, and shorten the construction period of the blast furnace.

As mentioned above, although the reduction of the construction period in the number of blast furnaces has been considered for a long time, since the blast furnaces are large structures and heavy materials, it is difficult to actually apply the construction period reduction method, and various examinations are still conducted in various places. And many patent applications have been made.

For example, Japanese Unexamined Patent Application Publication No. 09-143521 discloses that in dismantling or reconstructing an existing blast furnace, (a) the furnace body is divided into several ring-shaped blocks from the furnace top to the bottom of the furnace, respectively. A process of drying at a place other than the foundation; (b) applying a means for preventing bending or distortion of the brick stacking portion and a means for securing roundness to each block except for the lowermost bottom block among the ring-shaped blocks; c) On the other hand, the bottom block is a step of stacking bricks on a bottom plate provided at its lower end, and (d) Ring-shaped blocks other than the bottom block are carried on the blast furnace base by transfer to the side. After that, the step of joining each other while lifting up sequentially from the labor government by the lift-up method, (e) the bottom block after carrying the blast furnace foundation level on the foundation by the transfer to the side, Short number of blast furnace comprising a step of locking to the junction and is built how this disclosure.

In addition, Japanese Patent Laid-Open No. 10-102778 discloses a blast furnace that divides and disassembles an existing furnace body into a plurality of ring blocks from the labor government to the bottom part, and also manufactures the same ring block to build up ring blocks on the blast furnace foundation. In the furnace construction method, a suspension replacement device for elevating the ring block of the furnace is installed in a place other than the blast furnace foundation, and the ring block is moved to a transport truck loaded with a suspension mechanism for dropping level adjustment so as to match the dropping level with the blast furnace foundation level. After transporting to the suspension replacement device and supporting the ring block with the suspension replacement device, the suspension level adjustment mechanism is removed, the transport block is lifted down to a level capable of at least an upper suspension, and then mounted by the transport cart. Transport block, while transport bogie can dry the ring block at the lowest level possible at least the upper suspension, The vehicle is transported to the suspension replacement device by a transport cart, and the suspension block is supported by the ring block and lifted up to a level movable on the blast furnace foundation level. A method of constructing a blast furnace body, which is suspended from an upper portion of a customized transport trolley and transported to a blast furnace foundation, is disclosed.

The method described in Unexamined-Japanese-Patent No. 47-1846 is a method of constructing each divided | segmented block on the scaffold of the same height as an assembly completion height, and moving and completing each part using a moving scaffold after completion. In this method, the height of the blast furnace main body is about 100 m, and this furnace body is divided and a scaffold is assembled for each division height to construct a block on this scaffold.

Therefore, in this method, even a divided block weighs several thousand tons, and a scaffold having rigidity that can withstand this weight is required, and since this scaffold is required for each divided block, the production cost of this scaffold becomes high. The method did not come true.

In the method described in Japanese Patent Application Laid-Open No. 09-143521, the furnace body blocked in a ring shape is moved to the blast furnace base, lifted up to join each ring, and finally, the furnace block is moved and placed in the furnace block. Bond and complete. At this time, the bottom block piles up bricks on the bottom plate.

However, the furnace of the blast furnace has a diameter of 10 to 20 m, and when the bricks are stacked on the furnace plate, deformation of the furnace plate is the most important problem, but the above-mentioned publication does not disclose this important problem and its solution. Therefore, there has been an idea of building bricks in the block of the notor, but it is a current issue among those skilled in the art how to solve the above-mentioned problems specifically, and the situation has not been realized.

Moreover, in Japanese Unexamined Patent Application Publication No. 10-102778, the suspension replacement device for dropping level adjustment is provided so that a suspension replacement device for elevating the ring block of the furnace body is provided at a place other than the blast furnace foundation, and the ring block is adjusted to the dripping level of the blast furnace. Although a method of moving to a blast furnace basis in a transport truck with a mechanism is disclosed, it is not disclosed about the pre-installation of bricks to a blocked furnace body.

As described above, although the blast furnace construction is an essential technique for shortening the construction period, the weight of each block increases as the block formation progresses, and thus a high conveying technique is required, but the patent document does not describe the conveying technique.

This invention is completed as a result of earnestly examining by this inventor in order to solve the said subject, The summary is as follows.

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(1) Load the rug beam in the balance beam in advance at the place other than the blast furnace base, construct the blast furnace notch mantle integrally on the rug beam, construct the brick in the notch mantle, and then move the balance beam by moving cart A method of carrying a blast furnace mantle to a blast furnace foundation on the basis of a blast furnace mantle, wherein a laser transmitter is installed at an arbitrary position on an upper surface of a brick constructed on the blast furnace mantle, and a plurality of lasers are disposed at an arbitrary position on a brick upper surface. Positioning the receiver on a straight line and measuring the amount of deflection of the upper surface of the brick obtained by detecting the amount of vertical displacement of the laser to be received while carrying the nosing mantle with the amount of deflection of the upper surface of the brick constructed in the furnace being 3 mm or less per 1 m of mantle radius. The carrying method of the furnace mantle for blast furnaces characterized by the above-mentioned.

(2) The error caused by the inclination of the laser transmitter due to the deflection of the upper surface of the brick from the vertical displacement amount detected by the laser receiver is always set to 0 as the laser receiver at the shortest of the laser receivers arranged on the straight line; The value of the laser receiver placed on the opposite side is read out, and the value of the laser receiver placed therebetween is determined from the distance from each laser receiver to the zero reference laser receiver and the value of the laser receiver on the opposite side. The method of conveying the furnace mantle for blast furnaces as described in said (1) characterized by correcting and making the vertical displacement amount after correction into a true deflection amount.

According to the present invention, even in a mantle mantle whose weight is increased by constructing the brick in advance in a place other than the foundation of the blast furnace, it can be transported stably up to the blast furnace foundation without causing cracking or the like.

1 is a view for explaining the outline of the blast furnace.

Fig. 2 is a diagram showing an outline of the construction of a nodling mantle according to the present invention.

3 is a diagram for explaining an outline of an experimental mini-model.

Fig. 4A is a diagram schematically showing the planar structure of the rug beam.

Fig. 4B is a view showing the cross-sectional structure of the rug beam.

5 is a diagram showing the relationship between the thickness of the rug beam and the amount of warpage.

6 is a diagram schematically showing a cross-sectional structure of a balance beam.

7 is a diagram showing a relationship between the thickness of the balance beam and the amount of warpage.

Fig. 8 (a) is a diagram illustrating a noser mantle constructed with bricks at the ground assembly site.

Fig. 8B is a view showing a nodling mantle that is transported on a mobile truck.

Fig. 8C is a view showing a nodling mantle carried by using an air caster.

Fig. 9A is a diagram showing the arrangement of the moving cart according to the present invention.

Fig. 9B is a view showing a conventional arrangement.

10A is a diagram illustrating an example of an installation form of the reinforcing ring.

Fig. 10B is an enlarged view of the reinforcing ring.

Fig. 11A is a diagram showing an example of the installation form of the stay material.

Fig. 11B is an enlarged view of the stay material.

It is a figure which shows an example of the arrangement form of an air caster.

Fig. 13A is a diagram showing an example of the arrangement of the laser transmitter and the laser receiver.

Fig. 13B is a diagram showing the amount of warpage of the upper surface of the brick.

Fig. 14 is a diagram showing an error caused by the inclination of the laser transmitter due to the deflection of the upper surface of the brick.

Fig. 15A is a diagram showing another example of the arrangement of the laser transmitter and the laser receiver.

Fig. 15B is a diagram showing another example of the arrangement of the laser transmitter and the laser receiver.

Fig. 16 is a diagram showing a correction method for eliminating errors caused by the inclination of the laser transmitter due to the warp of the brick upper surface.

17 is a view for explaining the technical significance of installing the measuring device on the upper surface of the brick constructed in the nozer mantle.

1 to 17, the best mode for carrying out the present invention will be described.

As shown in Fig. 1, the number of dismantling of the blast furnace is performed by cutting the furnace body 2 of the blast furnace in the horizontal direction, dividing it into plural stages in the vertical direction, and taking it out of the blast furnace foundation 5 on the blast furnace foundation 5. On the other hand, the newly installed furnace body 2 is constructed with a predetermined number of blocks at a place other than the blast furnace foundation (ground assembly site).

Fig. 2 is a view showing a state when the block is transported and the mantle mantle 1 constructed at the ground assembly site. In the above-described ground assembly site in which the furnace body is constructed in advance, the balance beam 16 is standing on the ground and the rug beam 12 is loaded on the upper surface of the balance beam 16. Between the rug beam 12 and the balance beam 16, the air caster 18 which raises a rug beam can be incorporated. The nosers mantle 1 is constructed on the upper surface of the rug beam 12 constructed in this way.

4 and 12 show an example of the arrangement form of the air caster 18, the arrangement method of the air caster 18 is not limited to this.

In detail, the iron shell 7 is erected on the bottom plate 6, the stave cooler 8 is placed inside the iron plate 7, and the joint material 11 is placed on the upper surface of the bottom plate 6. The subgrade brick 9 is constructed through this. And the carbon brick 10 is constructed through the joint material on the upper surface of this hearth brick 9. In this state, the weight of the nosers mantle 1 is about 1000 tons or more, and in order to construct the nosers mantle 1 on the balance beam 16 installed in the ground assembly site, the balance beam 16 is rigid. It is necessary to prevent deformation of the nosers mantle.

However, there is no technique specifically describing how to prevent deformation of the nosers mantle. Therefore, the inventors repeated numerical analysis and experiment by the finite element method, and as a result, the curvature amount per 1 m of mantle radius was restrained to 3 mm on the upper surface of the carbon brick 10 to be installed in the notch mantle 1, thereby notifying the notch mantle ( When carrying 1), the viewpoint that it can load on the blast furnace base and can use it in the state was acquired.

In the experiment, as shown in Fig. 3, the subgrade brick 9 is constructed on the bottom plate 6 through the stamping material 25, and the carbon brick is applied to the upper surface of the subgrade brick 9 through the stamping material 25. The mini model which constructed (10) was employ | adopted.

As shown in Fig. 3, the jack 24 was provided in the lower part of the miniature mantle of the mini model, and the state of the gap with the joint or the stamp material 25 which was constructed between the carbon bricks by operating the jack was observed. The results are shown in Table 1.

[Table 1] Relationship between warpage and gap occurrence

Deflection amount [mm / m] 1.0 2.0 2.5 3.0 3.5 When the gap occurs after the wheel  Sound sound  Sound sound  Sound sound  There is clearance soundness  With gap with gap

From the results in Table 1, when the deflection exceeds 3 mm / m, a gap is generated in the joint t portion, and when it is 3 mm / m or less, the crack does not occur due to the expansion and contraction of the joint. Therefore, in order to suppress the curvature in a carbon brick upper surface to 3 mm / m or less, it examined more concretely.

There are two types of blast furnace bottoms: a blast furnace having a rug beam 12 and a type in which a bottom plate is directly installed on a foundation. Fig. 2 is a diagram showing a form in which a furnace body in which a nosing mantle is loaded on an electron covering beam is carried. On the basis of the blast furnace, a mantle mantle and a rug beam are installed. For this purpose, it is necessary to make the covering beam 12 rigid.

The structure of the rug beam 12 is shown in Figs. 4A and 4B. As shown in Figs. 4A and 4B, the rug beam 12 is constructed by assembling an H-shaped steel in an “井” shape or a lattice shape, and introducing the refractory concrete 15 into it. It is high rigidity. The amount of warpage of the rug beam thus constructed is shown in FIG.

If the thickness H of the rug beam was not more than 480 mm, the amount of warpage obtained in the experiment exceeded 3 mm / m, and it was found that the thickness H of the rug beam was required at least 480 mm. In addition, when the thickness H of the rug beam exceeds 1000 mm, the weight increases and is not economical.

In Fig. 2, the rug beam is mounted on the balance beam. Therefore, the balance beam 16 supports the notch mantle 1 and the rug beam 12, and the rigidity for suppressing the curvature of the upper surface of the carbon brick in a notch mantle to 3 mm / m or less is needed.

In order to suppress the warping to 3 mm / m or less, as shown in Figs. 6 and 7, the thickness A of the balance beam needs to be 700 mm or more. If it is 700 mm or more, the curvature of the upper surface of the carbon brick can be suppressed to 3 mm / m or less, but there is a limit in the strength of the moving trolley for carrying the nosers mantle and the rug including the balance beam, and the height of the balance beam A Becomes 2200 mm or less.

The conveyance from the ground assembly site to the side of the blast furnace base uses a moving trolley 17, which is a large-scale heavy load conveying trolley, as shown in Fig. 8B. That is, the moving trolley 17 is connected in a transport direction (length direction) to form a plurality of moving trolleys, and the formed plurality of moving trolleys are drawn in a gap formed between the balance beam 16 and the ground surface in parallel. By operating the hydraulic pressure of the moving trolley, the balance beam 16 is raised to be transported to the side of the blast furnace base.

In addition, Fig. 8 (a) shows a nodling mantle constructed with bricks in a ground assembly site, Fig. 8 (b) shows a nodling mantle carried with moving carts, and Fig. 8 (c) shows the use of an air caster. Represents the nodling mantle being carried.

The length of each of the moving train rows arranged in parallel is reduced as it goes from the center row to the row located at the end, as shown in Fig. 9A. Since the nosers mantle 1 has a cylindrical shape, the load applied to the moving trolley can be absorbed in a balanced manner by reducing the length of the moving trolley from the center portion toward the end portion.

Further, as the arrangement of the moving trolleys, when the distance between the moving trolleys is within 2.5 m, the distance P between the cylinders arranged in the moving trolleys is 2.5 m or less, and the distance supporting the balance beam 16 is 2.5 m or less. Becomes By setting the support point of the balance beam to 2.5 m or less, the warpage amount of the balance beam can be suppressed to a minimum, and the portion protruding from the outer mantle outer diameter can be suppressed to the maximum.

In addition, as shown in Fig. 9B, in general, the lengths of the moving trains are generally fixed, but in this case, the portion away from the center of the bottom plate is farther than that of other parts. Since the load from the rug beam 12 and the balance beam 16 provided in the mantle 1 and its lower surface is not loaded, the nodling mantle is greatly deformed through the balance beam.

In addition, it is preferable to make the shape of the balance beam 16 into the shape according to the length of the moving-column which is drawn in. With such a shape, it becomes possible to evenly distribute the load applied to the moving trolley and further reduce the amount of warping during transportation.

10 (a) and 10 (b) are diagrams showing the outline of the reinforcing ring 19. FIG. The reinforcement ring 19 is arrange | positioned at the upper outer periphery of the notch mantle 1. If the pre-construction part of the brick into the nodling mantle is the roadbed brick 9 and the carbon brick 10, there is a barbed part of the nodular mantle, so that deformation of the nodled mantle bark due to bending of this part is prevented. do.

11A and 11B are diagrams showing the outline of the stay material 21 provided on the inner mantle inner surface. The stay material 21 is arrange | positioned radially. The stay material 21 is arrange | positioned in the vicinity of the upper part of the carbon brick constructed in the furnace mantle. This is because it is better to be as close to the upper surface of the carbon brick 10 as possible in order to prevent bending of the upper surface of the carbon brick as much as possible.

As described above, in the present invention, even in the furnace mantle 1 in which the weight is increased by constructing the brick in advance in places other than the foundation of the blast furnace, the bending amount of the upper surface of the brick constructed in the furnace is 3 mm or less per 1 m radius of the mantle. It is an invention completed based on the novel and useful technical viewpoint which does not exist in the prior art that it can carry stably up to the blast furnace foundation, without breaking of a brick, etc. when it carries out.

Therefore, in order to make stable conveyance more reliable, when carrying the nodling mantle 1 using the mobile trolley | bogie 17 or the air caster 18, it conveys, measuring the deflection amount of the upper surface of a brick using a predetermined measuring apparatus. It is desirable to.

12 shows an example of the arrangement of the air casters 18. FIG.

In order to measure the amount of warp of the upper surface of the brick, a laser transmitter 26 and a plurality of laser receivers 27 for receiving the laser 28 transmitted by the laser transmitter 26 are placed on the upper surface of the brick constructed in the nod mantle 1. It is preferable to install.

In order to measure the warping amount of the object to be deformed originally, as shown in Fig. 17, a transmitter such as a laser is provided at a fixed point, a floating reference point is provided at one of the fixed points, and relative to the reference point. It is common to find the amount of vertical displacement at the measurement point in the comparison.

However, when it is going to measure the amount of warpage of the upper surface of the brick constructed in the notch mantle 1, it is difficult to measure a measurement point from the external fixed point because the measurement object is located in the inside surrounded by the shell.

In addition, since the measurement object also moves several tens to hundreds of meters, it is impossible to put the transmitter at a fixed point in view of the receiver's reception capability. It is also possible to measure the amount of warp by entering a person in the furnace, but it is very dangerous to enter the furnace during transportation. Moreover, since the curvature of a brick upper surface changes with time, it is impossible to measure instantaneously with an attractive force.

Therefore, as shown in Fig. 13A, the laser transmitter 26 is provided at an arbitrary position on the upper surface of the brick constructed in the furnace mantle 1, and similarly, a plurality of laser receivers 27 are located at any position on the upper surface of the brick. ) Is preferable.

As a result, the amount of vertical displacement of the laser received by each laser receiver 27, that is, how much the laser reception position in each laser receiver 27 is displaced in the vertical direction as compared with before the mantle is transported, The amount of warpage can be measured.

In this case, it is preferable to arrange the plurality of laser receivers 27 on a straight line. By arranging on a straight line, as shown in Fig. 13B, the amount of vertical displacement on the straight line, that is, the amount of warp of the brick upper surface can be accurately measured.

The laser transmitter 26 is not particularly limited, and a rotating laser shown in Fig. 13A can be used. By using a rotating laser, the vertical displacement amount which changes every time can be detected instantly. Similarly, the laser receiver 27 is not specifically limited, either, but the displacement measuring device for rotary lasers can be used.

In addition, although not shown, it is preferable to transmit the laser reception position data in each laser receiver 27 to the worker outside a furnace by the communication means by wireless or wired. For example, by connecting each laser receiver 27 and a calculator (computer) installed in addition to the furnace by wireless or wired communication means, the amount of vertical displacement in each laser receiver that changes every time due to mantle transportation, that is, The amount of warpage can be checked from time to time.

In the vertical displacement detection, the laser receiver 27 can store the laser reception position before carrying the mantle, and can use the laser receiver 27 that can calculate the difference from the laser reception position that changes every time. The difference may be performed by itself or by a calculator (computer) connected by a wireless or wired communication means.

As described above, in the present invention, since the laser transmitter 26 and the laser receiver 27 are installed on the upper surface of the brick constructed in the mantle mantle, when the warpage occurs on the upper surface of the brick as shown in FIG. An inclination occurs at 26, and an error is included in the laser reception position in each laser receiver 27, and also the amount of vertical displacement detected.

This error increases in proportion to the distance between the laser transmitter 26 and each laser receiver 27 as shown in FIG.

In other words, as the radius of the notch mantle 1 increases and the amount of warpage increases, there is a fear that the measurement error cannot be ignored. 15 (a) and 15 (b) are diagrams showing another embodiment of an arrangement example of the laser transmitter 26 and the laser receiver 27. FIG. By arrange | positioning in this way, the correction which removes the error which arises by the inclination of the laser transmitter 26 resulting from the curvature of a brick upper surface can be performed.

This method arrange | positions several laser receiver 27 on the same straight line, and correct | amends and correct | amends the error which arises by the inclination of the laser transmitter 26 resulting from the curvature of a brick upper surface from the detected vertical displacement amount, and correct | amends, The amount of subsequent vertical displacement is taken as the true amount of warpage.

Specifically, as shown in Table 2, the laser receiver A (measurement point A) of the shortest part arrange | positioned on a straight line always makes zero reference | standard. And the value of the laser receiver B arrange | positioned at the opposite shortest part is read out, and the value of the receiver provided in between is correct | amended according to the installation distance L.

According to this method, as shown in Fig. 16, the error caused by the inclination of the laser transmitter 26 due to the warping of the upper surface of the brick can be eliminated, thereby making the transport of the nosers mantle 1 more stable. Can be.

[Table 2]

Measuring point A T1 T2 T3 B Distance L [m] 0 4 8 12 16 Measured value X [mm] 0 -8.3 -11.8 -10.7 -5.2 Correction value Y [mm] 0 -1.3 -2.6 -3.9 -5.2 X-Y [mm] after correction 0 -7.0 -9.2 -6.8 0

As mentioned above, according to the present invention, the mantle mantle can be transported stably up to the blast furnace foundation. Therefore, the present invention is highly applicable to the steel industry.

Claims (8)

delete delete delete delete delete delete After loading the rug in the balance beam in places other than the blast furnace foundation, constructing the blast furnace nostle mantle integrally on the rug beam, constructing the brick in the nosing mantle, and interposing the balance beam with the moving cart. In the conveying method of the furnace mantle which carries the said blast furnace notch mantle to the blast furnace foundation top, The laser transmitter is installed at an arbitrary position on the upper surface of the brick constructed on the nozzle mantle, and similarly, a plurality of laser receivers are arranged on a straight line at an arbitrary position on the upper surface of the brick which does not form the same line as the laser transmitter, and the vertical direction of the laser is received. A transport method of a furnace mantle for a blast furnace, characterized by transporting a nosing mantle with a bending amount of the upper surface of the brick constructed in the furnace while measuring the amount of deflection of the upper surface of the brick obtained by detecting the amount of displacement. 8. The laser receiver according to claim 7, wherein the error caused by the inclination of the laser transmitter due to the deflection of the upper surface of the brick from the vertical displacement amount detected by the laser receiver is always zero based on the laser receiver arranged on the straight line. The value of the laser receiver placed in the shortest part on the opposite side is read out, and the distance from each laser receiver from the laser receiver which becomes 0 reference to the value of the laser receiver provided in the meantime, and the laser receiver of the shortest part on the opposite side A method of conveying a furnace mantle for a blast furnace, characterized in that the correction is made from the value of and the vertical displacement amount after the correction is a true deflection amount.

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