Method for dismantling hot blast furnace and method for constructing hot blast furnace

Abstract

To provide a method for dismantling a hot blast furnace and a method for constructing the hot blast furnace capable of limiting an opening for work to one place on an upper part of a furnace body.SOLUTION: Provided is a method for dismantling a hot blast furnace 1 in which a heat storage brick 13 is constructed inside a furnace body 12. As a dismantling preparation stage, a relay deck 33 passable to the outside of the furnace through an opening 32 for work is installed in an upper part of the furnace body 12, and a plurality of working sections 41 and 42 partitioned by a vertical partition member 40 are formed between the relay deck 33 and an upper surface 131 of the heat storage brick 13. As a dismantling stage, while dismantling the upper surface of the heat storage bricks in the plurality of working sections 41, brick scraps dismantled in other working sections 42 are recovered and conveyed to the relay deck 33, and the working sections 42 for recovering the brick scraps are changed to the other working sections 41 with the progress of the dismantling work.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method for dismantling a hot stove and a method for erecting a hot stove. [Background technology]

[0002] A hot stove is used to supply high-temperature gas to a blast furnace. The heat storage chamber of the hot stove is made of heat storage bricks built inside the furnace body. The heat storage bricks in hot stoves deteriorate year by year due to repeated heat storage and air blowing. For this reason, hot stoves undergo renewal work every few years, in which the heat storage bricks inside the furnace are dismantled and new heat storage bricks are installed.

[0003] Regarding the dismantling work for updating hot stoves, for example, the methods described in Patent Documents 1 and 2 below have been proposed. In Patent Document 1, a discharge duct is installed that extends vertically along the outer periphery of the furnace body, and multiple discharge openings are formed at different heights of the furnace body and each opening is connected to the discharge duct. Then, heat storage bricks are dismantled one by one from the top inside the furnace body, and the brick chips are discharged from the nearest opening, dropped into the duct, and discharged to the ground. In Patent Document 2, workers and work machines are introduced through a work opening formed in the top of the furnace, the heat storage bricks inside the furnace are partially dismantled from the top, a chute extending vertically inside the furnace is formed, and a discharge opening communicating with the chute is formed in the lower part of the furnace. The remaining part of the top surface of the heat storage bricks is then dismantled in sequence, and the brick chips are dropped into the chute and discharged from the discharge opening.

[0004] Meanwhile, with regard to furnace construction work when updating a hot stove, for example, a method has been proposed in Patent Document 3 below. In Patent Document 3, a conveyor is installed that extends vertically along the outer periphery of the furnace body, and multiple loading openings are formed at different heights of the furnace body. Furthermore, conveyors are installed that extend into the furnace through each opening, and a distribution device is suspended and supported inside the furnace body. When constructing the furnace, heat storage bricks are lifted by the conveyor outside the furnace, and supplied to the distribution device inside the furnace via one of the loading openings and the conveyor, and constructed inside the furnace body. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 57-120605 [Patent Document 2] JP 2017-150032 A [Patent Document 3] Japanese Patent Application Publication No. 5-229644 Summary of the Invention [Problem to be solved by the invention]

[0006] In the dismantling method of Patent Document 1, it is necessary to provide multiple openings for removal in the furnace body, which makes the opening work complicated. When reusing the furnace body, such as for updating the hot stove, it is also necessary to reseal the multiple openings. Furthermore, during the dismantling work, it was necessary to change the opening used for removal as the dismantling of the heat storage bricks inside the furnace progressed, making the work more complicated. Furthermore, many existing hot stoves use asbestos in the insulation of the furnace walls, and when creating an evacuation opening, construction work must be carried out to prevent asbestos contamination at each opening. This creates the problem that the large number of evacuation openings increases construction costs and also increases the load on the furnace body. The dismantling method of Patent Document 2 can reduce the number of openings in the furnace body to one for carrying out the bricks and can omit the need for an outside furnace duct, thereby reducing construction costs. However, it is necessary to provide an entrance for workers in the furnace body in addition to the opening for carrying out the brick chips. Furthermore, in the dismantling method of Patent Document 2, an opening for removal is provided at the bottom of the furnace close to the ground, which is suitable for cases where all of the heat storage bricks are dismantled, such as when a heat storage furnace is completely renewed. However, even when only the upper heat storage bricks need to be renewed, it is necessary to dismantle the healthy heat storage bricks at the bottom as well, resulting in waste. In the furnace construction method of Patent Document 3, since a plurality of openings are provided in the furnace body, there are problems similar to those in Patent Document 1 described above.

[0007] An object of the present invention is to provide a method for dismantling a hot stove and a method for constructing a hot stove that enable the opening for work to be limited to one location at the top of the furnace body. [Means for solving the problem]

[0008] A method for dismantling a hot stove having heat storage bricks built inside the furnace body, comprising the steps of: In a dismantling preparation stage, a relay deck that allows access to the outside of the furnace through a work opening is installed on the upper part of the furnace body, and a plurality of work sections are formed between the relay deck and the upper surface of the heat storage bricks and separated by vertical partitions, In the demolition stage, the upper surfaces of the heat storage bricks are dismantled in each of the multiple work sections, while the dismantled brick chips are collected in one of the work sections and transported to the relay deck, and as the demolition work progresses, the work section from which the brick chips are collected is sequentially changed to another work section.

[0009] In the present invention, the brick waste generated by dismantling the heat storage bricks in the furnace can be lifted to the relay deck and carried out to the outside of the furnace through the work opening. Therefore, even if the height of the dismantled heat storage bricks in the furnace changes, the work opening can be limited to one place in the upper part of the furnace body. Furthermore, the dismantling of heat storage bricks and the collection of brick debris or the transportation of the debris to the relay deck can be carried out in parallel in multiple work areas, and by lifting the brick debris onto the relay deck and then transporting it outside the furnace, a decrease in work efficiency can be prevented even if the transportation route is extended.

[0010] In the dismantling preparation stage, a lifting device is installed in each of the work sections to reach the relay deck, In the dismantling stage, it is preferable that the brick scraps are transported from the work area to the relay deck using the lifting device.

[0011] In the dismantling preparation stage, a height-adjustable partition sheet is used as the partition material, In the dismantling step, it is preferable that the height of the partition sheet is expanded in accordance with the lowering of the height of the upper surface of the heat storage bricks. As the partition sheet of the present invention, a net or translucent sheet that can shield bricks and brick chips in case they fall when the bricks are laid out and that allows adjacent work sections to be roughly seen is suitable, but other sheets can also be used, and a method in which multiple sheets are joined together or a sheet wound up in a roll can be pulled out.

[0012] In the dismantling preparation stage, an external deck formed outside the furnace body and accessible to the work opening, and an external lifting device leading from the external deck to the ground are installed; In the demolition stage, it is preferable that the brick chips removed from the work opening are lowered to the ground by the external lifting device.

[0013] In the dismantling preparation stage, an external deck formed outside the furnace body and accessible to the work opening, and a cylindrical chute leading from the external deck to the ground are installed, In the dismantling stage, the brick chips removed from the work opening may be dropped into the chute.

[0014] A method for constructing a hot stove in which heat storage bricks are constructed inside a furnace body, comprising the steps of: In a furnace construction preparation stage, a relay deck that allows access to the outside of the furnace through a work opening is installed on the upper part of the furnace body, and a plurality of work sections separated by vertical partitions are formed between the relay deck and the heat storage bricks constructed on the bottom surface of the furnace body or inside the furnace body, In the furnace construction stage, in each of the multiple work sections, heat storage bricks are constructed on top of the heat storage bricks constructed on the bottom surface or inside the furnace body, while in one of the work sections, the heat storage bricks are transported from the relay deck, and as the construction work progresses, the work section into which the heat storage bricks are transported is sequentially changed to another work section.

[0015] In the present invention, the heat storage bricks to be used for furnace construction are carried into the furnace through the working opening, and then lowered from the relay deck onto the furnace bottom or onto the top of the heat storage bricks already stacked, allowing the heat storage bricks to be constructed inside the furnace. Therefore, even if the construction height of the heat storage bricks inside the furnace changes, the working opening can be limited to one location at the top of the furnace body. Furthermore, the work of transporting heat storage bricks and the work of stacking the transported heat storage bricks can be carried out in parallel in multiple work areas, and by lifting the heat storage bricks up to the work opening at the top of the furnace body and then lowering them from the relay deck, even if the transport route is extended, a decrease in work efficiency can be prevented.

[0016] In the furnace construction preparation stage, a lifting device is installed in each of the work sections to reach the relay deck, In the furnace construction stage, it is preferable that the heat storage bricks are transported from the relay deck to the work section using the lifting device.

[0017] In the furnace construction preparation stage, a partition sheet whose height is adjustable is used as the partition material, In the furnace construction stage, it is preferable that the height of the partition sheet is reduced as the height of the upper surface of the heat storage bricks increases. As the partition sheet of the present invention, a net or translucent sheet that can shield bricks in case they fall when the rack is lowered and that allows adjacent work sections to be roughly seen is suitable, but other sheets can also be used, and a method in which multiple sheets are joined together and cut off in sequence, or a method in which the sheet is wound up into a roll, can also be used.

[0018] In the furnace construction preparation stage, an external deck formed outside the furnace body and accessible to the work opening, and an external lifting device leading from the external deck to the ground are installed; In the furnace construction stage, it is preferable that the heat storage bricks are transported from the ground to the external deck using the external lifting device, and the heat storage bricks transported to the external deck are transported to the relay deck through the work opening.

[0019] A method for constructing a hot stove in which heat storage bricks inside the furnace body are dismantled and then constructed, comprising the steps of: In a dismantling preparation stage, a relay deck that allows access to the outside of the furnace through a work opening is installed on the upper part of the furnace body, and a plurality of work sections are formed between the relay deck and the upper surface of the heat storage bricks and separated by vertical partitions, In a dismantling stage, the upper surfaces of the heat storage bricks are dismantled in each of the plurality of work sections, while dismantled brick chips are collected in any of the work sections and transported to the relay deck, and the work section from which the brick chips are collected is sequentially changed to another work section as the dismantling work progresses, In the furnace construction stage, in each of the multiple work sections, heat storage bricks are constructed on the bottom surface of the furnace body or on top of the heat storage bricks constructed inside the furnace body, while the heat storage bricks are transported from the relay deck to one of the work sections, and the work section into which the heat storage bricks are transported is sequentially changed to another work section as the demolition work progresses. Effect of the Invention

[0020] According to the present invention, it is possible to provide a method for dismantling a hot stove and a method for constructing a hot stove, which can limit the opening for work to one location in the upper part of the furnace body. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is an elevational view showing a hot stove according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an elevational view showing the dismantling equipment of the first embodiment. [Diagram 3] FIG. 2 is a perspective view showing a work section according to the first embodiment. [Figure 4] FIG. 2 is a plan view showing a work section according to the first embodiment. [Diagram 5] FIG. 4 is a partial enlarged view showing a partition sheet of the first embodiment. [Figure 6] FIG. 4 is a partial enlarged view showing a lower end of the partition sheet of the first embodiment. [Figure 7] 4 is a flowchart showing a procedure of the first embodiment. [Figure 8] FIG. 4 is an elevational view showing a dismantling operation 1 (first time) according to the first embodiment. [Figure 9] FIG. 4 is an elevation view showing a dismantling operation 2 of the first embodiment. [Figure 10] FIG. 4 is an elevational view showing a dismantling operation 1 (second or later) in the first embodiment. [Figure 11] FIG. 4 is an elevational view showing a furnace construction facility according to a second embodiment of the present invention. [Figure 12] 6 is a flowchart showing a procedure of the second embodiment. [Figure 13] FIG. 4 is an elevational view showing the furnace construction preparation work according to the second embodiment. [Figure 14] FIG. 4 is an elevational view showing furnace construction work 1 of the second embodiment. [Figure 15] FIG. 4 is an elevational view showing furnace construction work 2 in the second embodiment. [Figure 16] 10 is a flowchart showing a procedure of a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] [First embodiment] FIG. 1 shows a hot stove 1 to which the present invention is applied. The hot stove 1 is an external combustion type hot stove in which the heat regenerator 10 and the combustion chamber 20 are separate entities. The heat regenerator 10 has a furnace body 12 built on a foundation 11. Inside the furnace body 12, a large number of heat storage bricks 13 are stacked from the bottom of the furnace. The furnace body 12 is cylindrical as a whole, but the upper part is a conical part 14, and a dome part 15 is connected to the top of that. The combustion chamber 20 has a furnace body 21 including a cylindrical iron shell. Burner bricks 22 are installed at the bottom of the furnace body 21, and a dome section 23 is connected to the upper end. The dome section 23 is connected to the dome section 15 of the regenerator chamber 10 by a dome connecting pipe 16. A mixing chamber 24 is connected to the part of the furnace body 21 above the burner bricks 22, and hot air is supplied from the mixing chamber 24 to the blast furnace via a hot air pipe 25.

[0023] FIG. 2 shows a dismantling installation according to the present invention installed in a regenerator 10 . An external deck 31 is installed on the top of the furnace body 12 on the outside of the furnace body 12, and a relay deck 33 is installed inside the furnace body 12. A work opening 32 is formed in the furnace body 12, and workers can pass between the external deck 31 and the relay deck 33 through the work opening 32. A work ladder 34 extending downward is installed on the relay deck 33, allowing workers to access the upper surface 131 of the heat storage bricks 13 from the relay deck 33.

[0024] A plurality of hoists 351 are installed on the upper surface of the relay deck 33, and a basket 352 is suspended from each hoist 351. The hoists 351 and baskets 352 constitute the lifting device 35. The baskets 352 may be mesh pallets, lager packs, or the like. A partition sheet 40 is suspended from the underside of the relay deck 33. The partition sheet 40 extends vertically, with its lower end reaching the upper surface 131 of the heat storage bricks 13 below the relay deck 33. This partition sheet 40 divides the upper surface 131 of the heat storage bricks 13 into a plurality of work sections 41, 42. There may be three or more work sections.

[0025] In FIGS. 3 and 4, the partition sheet 40 divides the space between the lower surface of the relay deck 33 and the upper surface 131 of the heat storage brick 13 into two work sections 41, . The partition sheet 40 is formed by joining multiple sheets, each having a height of Hs, one above the other. As the sheet used for the partition sheet 40, a net or a light-transmitting sheet that can block bricks and brick chips in case they fall during stacking and stacking and that allows adjacent work sections to be roughly visible is suitable, but other sheets may also be used. Adjacent partition sheets 40 are partially overlapped with each other, and workers can move back and forth between the two work sections 41, 42 through a gap 43 at the overlapping portion.

[0026] As shown in Fig. 5, cable ties 401 can be used at predetermined intervals to connect the individual sheets of the partition sheet 40. The partition sheet 40 is made up of multiple sheets connected in the vertical direction but not in the left-right direction, with the edges extending in the vertical direction overlapping each other (see Figs. 3 and 4). This blocks bricks and brick chips that may fall during stacking and unstacking, while allowing workers to push them apart to pass through as needed.

[0027] 6, when the bottom end of the partition sheet 40 is long, it can be wound around a winding portion 402 and secured with a cable tie 401. The cable tie 401 may be a shackle or the like. The partition sheet 40 may be formed by splicing together a plurality of sheets, or by pulling out a sheet wound around a roll.

[0028] Returning to FIG. 2, a conveyor 36 is installed on the upper surface of the relay deck 33 between each of the lifting devices 35 and in a portion leading to the external deck 31 through the work opening 32 . A chute 37 that continues to the ground is installed on the external deck 31. The chute 37 is formed in a cylindrical shape, and brick chips dropped from the upper end fall inside the chute 37 and can be discharged from the lower end onto the ground.

[0029] FIG. 7 shows the procedure for dismantling the heat storage bricks in this embodiment. In this embodiment, first, as a dismantling preparation work, the relay deck 33 and the external deck 31 described above are installed on the furnace body 12, and then the carrying-out equipment such as the lifting device 35, the conveyor 36 and the chute 37 are installed (work S11 in FIG. 7). The dismantling equipment installed in the dismantling preparation work is as described in FIG. 2.

[0030] Next, in demolition work 1, the heat storage bricks 13 are dismantled in the work section 41 (work S12), and the brick waste generated by the dismantling is removed from the work section 42 (work S13). Note that, since dismantling has not yet been performed in the initial demolition work 1, the removal of the brick waste from the work section 42 (work S13) is omitted. When the basket 352 is full of brick waste from the heat storage bricks 13 dismantled in the work area 41, the remaining amount of heat storage bricks 13 in the furnace body 12 is determined (operation S14), and if there is any remaining demolition work, the process moves to demolition work 2, and if there is no remaining demolition work, the process moves to operation S18 described below.

[0031] Next, in dismantling work 2, brick waste resulting from the dismantling is carried out in the work section 41 (work S15), and the heat storage bricks 13 are dismantled in the work section 42 (work S16). When the basket 352 is full of brick waste from the heat storage bricks 13 dismantled in the work section 42, the remaining amount of heat storage bricks 13 in the furnace body 12 is determined (operation S17), and if any dismantling remains, the process returns to demolition work 1, and then demolition work 1 and demolition work 2 are repeated in the same manner.

[0032] If there are no heat storage bricks 13 remaining to be dismantled in operation S17, it is determined whether furnace construction work should be carried out next (operation S18), and if so, the process proceeds directly to furnace construction work. If furnace construction work is not to be carried out subsequently, the removal equipment such as the lifting device 35, conveyor 36 and chute 37 that were installed during the dismantling preparation work are removed, and then the relay deck 33 and external deck 31 are removed (work S19), thereby completing the dismantling work.

[0033] FIG. 8 shows the work status of the first dismantling work 1 described above. 8A, a worker enters the work area 41 and dismantles the top surface 131 of the heat storage bricks 13. In parallel with dismantling the top surface 131, the worker loads the brick chips 132 generated by the dismantling into a basket 352. Since the work areas 41, 42 are separated by a partition sheet 40, it is possible to prevent bricks and brick chips from scattering into the work area 42 if they fall during stacking or unloading. In FIG. 8B, when the basket 352 becomes full of brick chips 132 of the heat storage bricks 13 dismantled in the work section 41, the first dismantling work 1 is completed.

[0034] FIG. 9 shows the working status of the above-mentioned dismantling work 2. 9A, a worker enters the work area 42 and dismantles the top surface 131 of the heat storage bricks 13. In parallel with dismantling the top surface 131, the worker loads the brick chips 132 generated by the dismantling into a basket 352. Since the work areas 41, 42 are separated by a partition sheet 40, it is possible to prevent bricks and brick chips from scattering into the work area 41 if they fall during stacking or unloading. Meanwhile, in the work area 41 , the basket 352 that is now filled with the brick chips 132 is lifted by the hoist 351 and collected on the relay deck 33 . In FIG. 9B, the brick chips 132 collected on the relay deck 33 are removed from the basket 352, transported to the outside of the furnace by the conveyor 36, and dropped down the chute 37 to be transported to the ground. 9C , when the basket 352 becomes full of brick chips 132 of the heat storage bricks 13 dismantled in the work section 42, the dismantling work 2 is terminated. The basket 352 of the work section 41, which was previously pulled up to the relay deck 33, is returned to the upper surface 131 of the heat storage bricks 13.

[0035] FIG. 10 shows the work status of the second and subsequent dismantling work 1. 10A, a worker enters the work area 41 and dismantles the upper surface 131 of the heat storage brick 13. In parallel with dismantling the upper surface 131, the worker loads the brick chips 132 generated by the dismantling into a basket 352. Meanwhile, in the work area 42 , the basket 352 that is now filled with the brick scraps 132 is lifted by the hoist 351 and collected on the relay deck 33 . In FIG. 10B, the brick chips 132 collected on the relay deck 33 are removed from the basket 352, carried out of the furnace by the conveyor 36, and dropped down the chute 37 to be carried to the ground. 10C , when the basket 352 becomes full of brick chips 132 of the heat storage bricks 13 dismantled in the work section 41, the dismantling work 1 is terminated. The basket 352 of the work section 42, which had been previously pulled up to the relay deck 33, is returned to the upper surface 131 of the heat storage bricks 13.

[0036] As previously explained in the work flow of Figure 7, in this embodiment, after the demolition preparation work (S11), the heat storage bricks 13 in the furnace body 12 can be dismantled by repeating demolition work 1 (S12 to S14, see Figures 8 and 10) and demolition work 2 (S15 to S17, see Figure 9) in the two work sections 41, 42. In this embodiment, the brick chips 132 generated by dismantling the heat storage bricks 13 inside the furnace can be lifted onto the relay deck 33 and carried out to the outside of the furnace through the work opening 32. Therefore, even if the dismantling height of the heat storage bricks 13 inside the furnace changes, the work opening 32 can be limited to one location on the upper part of the furnace body 12. Furthermore, the dismantling of the heat storage bricks 13 and the collection of the brick scraps 132 or the transporting of the same to the relay deck 33 can be carried out in parallel in multiple work sections 41, 42, and by lifting the brick scraps 132 to the relay deck 33 and then transporting them outside the furnace, a decrease in work efficiency can be prevented even if the transport route is extended.

[0037] Second Embodiment A second embodiment of the present invention is shown in each of Figures 11 to 15. In this embodiment, heat storage bricks 13 are built in the heat storage chamber 10 of the hot stove 1 shown in FIG. FIG. 11 shows a furnace construction installation according to the present invention installed in a regenerator 10. In Figure 11, the external deck 31, work opening 32, relay deck 33, work ladder 34, lifting device 35, conveyor 36, partition sheet 40, and work sections 41, 42 installed in the furnace body 12 are each the same as those in the first embodiment described above, and duplicate explanations will be omitted here. In this embodiment, a package 133 containing a predetermined amount of heat storage bricks 13 is suspended down by a hoist 351 of the lifting device 35. In this embodiment, an external lifting device 38 driven by an electric motor or other means is installed on the external deck 31 , and the package 133 of the heat storage bricks 13 is lifted from the ground to the external deck 31 by the external lifting device 38 .

[0038] FIG. 12 shows a procedure for constructing a furnace using heat storage bricks in this embodiment. In this embodiment, first, as a furnace construction preparation work, the aforementioned relay deck 33 and external deck 31 are installed on the furnace body 12, and then loading equipment such as the lifting device 35, conveyor 36 and external lifting device 38 are installed (work S21 in Figure 12).

[0039] Next, as furnace construction work 1, heat storage bricks 13 are constructed in the work section 41 (work S22), and new heat storage bricks 13 are carried into the work section 42 (work S23). Once the heat storage bricks 13 of the package 133 have been constructed in the work area 41, it is determined whether the upper surface 131 of the heat storage bricks 13 has reached a predetermined height (work S24), and if the construction height is not as desired, proceed to furnace construction work 2, and if the construction height is as desired, proceed to work S28, which will be described later.

[0040] Next, as furnace construction work 2, heat storage bricks 13 are constructed in the work section 42 (work S25), and new heat storage bricks 13 are carried into the work section 41 (work S26). Once the heat storage bricks 13 of the package 133 have been constructed in the work section 42, it is determined whether the upper surface 131 of the heat storage bricks 13 has reached a predetermined height (work S27), and if the construction height has not reached the desired height, the process returns to furnace construction work 1, and furnace construction work 1 and furnace construction work 2 are repeated in the same manner.

[0041] If the upper surface 131 of the heat storage brick 13 is at the desired construction height in operation S27, the transport equipment such as the lifting device 35, conveyor 36 and external lifting device 38 installed during the furnace construction preparation work are removed, and then the relay deck 33 and external deck 31 are removed (operation S28), thereby completing the furnace construction work.

[0042] FIG. 13 shows the working conditions of the furnace construction preparation work described above. In FIG. 13, in the furnace construction preparation work, the aforementioned external deck 31, work opening 32, relay deck 33, work ladder 34, lifting device 35, conveyor 36, partition sheet 40, and work sections 41, 42 are installed on the furnace body 12. The furnace construction work starts from the lowermost stage of the dismantling range of the thermal storage bricks 13 in the above-mentioned dismantling work. Initially, workers enter the work sections 41, 42 and the packages 133 of the thermal storage bricks 13 are lowered.

[0043] FIG. 14 shows the working conditions of the furnace construction work 1 described above. In FIG. 14A, a worker enters the work area 41, takes out a heat storage brick 13 from a package 133, and lays it on the bottom surface of the furnace body 12 or on the top surface 131 of an already laid heat storage brick 13. In parallel with the construction work in the work area 41, a new package 133 is carried into the external deck 31 by the external lifting device 38 and transported to the relay deck 33 by the conveyor 36. In FIG. 14B, in parallel with the construction work in the work area 41, the package 133 transported to the relay deck 33 is hoisted down to the work area 42 by the lifting device 35. In FIG. 14C, when the heat storage bricks 13 of the package 133 have been constructed in the work section 41, the furnace construction work 1 is completed. A new package 133 has been lowered into the work area 42, so that furnace construction work 2 can begin immediately.

[0044] FIG. 15 shows the working conditions of the furnace construction work 2 described above. In FIG. 15A, a worker enters the work area 42, takes out a heat storage brick 13 from a package 133, and lays it on the bottom surface of the furnace body 12 or on the top surface 131 of an already laid heat storage brick 13. In parallel with the construction work in the work area 42, a new package 133 is carried into the external deck 31 by the external lifting device 38 and transported to the relay deck 33 by the conveyor 36. In FIG. 15B, in parallel with the construction work in the work area 42, the package 133 transported to the relay deck 33 is hoisted down to the work area 41 by the lifting device 35. In FIG. 15C, when the heat storage bricks 13 of the package 133 have been constructed in the work section 42, the furnace construction work 2 is completed. A new package 133 has been lowered into the work area 41, and furnace construction work 1 can begin immediately.

[0045] As previously explained in the work flow of Figure 12, in this embodiment, after the furnace construction preparation work (S21), furnace construction work 1 (S22 to S24, see Figure 14) and furnace construction work 2 (S25 to S27, see Figure 15) are repeated in the two work sections 41, 42 to construct heat storage bricks 13 in the furnace body 12. In this embodiment, the heat storage bricks 13 used for furnace construction are carried into the furnace through the work opening 32 and lowered from the relay deck 33 onto the furnace bottom or onto the top surfaces 131 of the heat storage bricks 13 already stacked, thereby constructing the heat storage bricks 13 inside the furnace. Therefore, even if the construction height of the heat storage bricks 13 inside the furnace changes, the work opening 32 can be limited to one location on the upper part of the furnace body. Furthermore, the work of transporting the heat storage bricks 13 and the work of stacking the transported heat storage bricks 13 can be carried out in parallel in multiple work sections 41, 42, and by lifting the heat storage bricks 13 up to the work opening 32 at the top of the furnace body 12 and then lowering them from the relay deck 33, even if the transport path is extended, a decrease in work efficiency can be prevented.

[0046] Third Embodiment A third embodiment of the present invention is shown in FIG. In this embodiment, in the heat storage chamber 10 of the hot stove 1 shown in FIG. 1 described above, after dismantling the existing heat storage bricks 13, furnace construction work using new heat storage bricks 13 is carried out. In this embodiment, the dismantling equipment of the first embodiment (see FIG. 2) and the furnace construction equipment of the second embodiment (see FIG. 11) are used.

[0047] FIG. 16 shows a procedure for constructing a furnace using heat storage bricks in this embodiment. In Figure 16, the dismantling preparation work (task S31), dismantling work 1 (tasks S32 to S34), and dismantling work 2 (tasks S35 to S37) are similar to the dismantling preparation work (task S11), dismantling work 1 (tasks S12 to S14), and dismantling work 2 (tasks S15 to S17) in the first embodiment described above. Furnace construction work 1 (works S42 to S44) and furnace construction work 2 (works S45 to S47) are similar to furnace construction work 1 (works S22 to S24) and furnace construction work 2 (works S25 to S27) in the second embodiment described above.

[0048] In the second embodiment described above, furnace construction preparation work was carried out before furnace construction work 1 and 2, but in this embodiment, the dismantling equipment used in the dismantling work has already been installed in the furnace body 12, and many pieces of equipment can be used as furnace construction equipment. Therefore, when the repetition of dismantling work 1 and 2 is completed, the equipment dedicated to removal is removed and additional equipment for carrying in is installed (work S41), and the furnace construction preparation work of the second embodiment described above is omitted. A specific content of the work S41 is, for example, removing the chute 37 and the basket 352 of the first embodiment and installing the external lifting device 38 of the second embodiment.

[0049] According to this embodiment, the effects of the first and second embodiments described above can be obtained, and much of the dismantling equipment can be utilized as furnace construction equipment, thereby reducing equipment costs and shortening construction time.

[0050] Other Embodiments The present invention is not limited to the above-described embodiment, and modifications within the scope of the present invention are included in the present invention. In the above embodiment, two work sections 41, 42 were set, and demolition work 1, 2 or furnace construction work 1, 2 were performed alternately. However, two or more work sections may be set. Then, brick waste 132 may be removed from one work section, and demolition work 1, 2, 3, etc. may be performed sequentially in another work section, or new heat storage bricks 13 may be brought in one work section, and furnace construction work 1, 2, 3, etc. may be performed sequentially in another work section. [Industrial Applicability]

[0051] The present invention can be used for a method for dismantling a hot stove and a method for constructing a hot stove. [Explanation of symbols]

[0052] 1...hot air furnace, 10...heat storage chamber, 11...foundation, 12...furnace body, 13...heat storage brick, 131...top surface, 132...brick scraps, 133...package, 14...conical section, 15...dome section, 16...dome connecting pipe, 20...combustion chamber, 21...furnace body, 22...burner brick, 23...dome section, 24...mixing chamber, 25...hot air pipe, 31...external deck, 32...work opening, 33...relay deck, 34...work ladder, 35...lifting device, 351...hoist, 352...basket, 36...conveyor, 37...chute, 38...external lifting device, 40...partition sheet, 401...cable tie, 402...winding section, 41...work area, 42...work area, 43...gap, Hs...height.

Claims

1. A method for dismantling a hot stove having heat storage bricks built inside the furnace body, comprising the steps of: In a dismantling preparation stage, a relay deck that allows access to the outside of the furnace through a work opening is installed on the upper part of the furnace body, and a plurality of work sections are formed between the relay deck and the upper surface of the heat storage bricks and separated by vertical partitions, In the dismantling stage, the upper surfaces of the heat storage bricks are dismantled in each of the plurality of work sections, while the dismantled brick chips are collected in one of the work sections and transported to the relay deck, and the work section from which the brick chips are collected is sequentially changed to another work section as the dismantling work progresses.

2. In the dismantling preparation stage, a lifting device is installed in each of the work sections to reach the relay deck, The hot stove dismantling method according to claim 1 , wherein in the dismantling step, the brick waste is transported from the work section to the relay deck using the lifting device.

3. In the dismantling preparation stage, a height-adjustable partition sheet is used as the partition material, The method for dismantling a hot stove according to claim 1 , wherein in the dismantling step, a height of the partition sheet is expanded in accordance with a lowering of a height of an upper surface of the heat storage brick.

4. In the dismantling preparation stage, an external deck formed outside the furnace body and accessible to the work opening, and an external lifting device leading from the external deck to the ground are installed; The hot stove dismantling method according to any one of claims 1 to 3, wherein in the dismantling stage, the brick chips carried out from the work opening are lowered to the ground by the external lifting device.

5. In the dismantling preparation stage, an external deck formed outside the furnace body and accessible to the work opening, and a cylindrical chute leading from the external deck to the ground are installed, The method for dismantling a hot stove according to any one of claims 1 to 3, wherein in the dismantling stage, the brick chips carried out from the work opening are dropped into the chute.

6. A method for constructing a hot stove in which heat storage bricks are constructed inside a furnace body, comprising the steps of: In a furnace construction preparation stage, a relay deck that allows access to the outside of the furnace through a work opening is installed on the upper part of the furnace body, and a plurality of work sections separated by vertical partitions are formed between the relay deck and the heat storage bricks constructed on the bottom surface of the furnace body or inside the furnace body, This method for constructing a hot air stove includes, as a furnace construction step, constructing heat storage bricks on top of the heat storage bricks constructed on the bottom surface or inside the furnace body in each of a plurality of working sections, while transporting the heat storage bricks from the relay deck to one of the working sections, and sequentially changing the working section into which the heat storage bricks are transported to another working section as the construction work progresses.

7. In the furnace construction preparation stage, a lifting device is installed in each of the work sections to reach the relay deck, 7. The method for constructing a hot stove according to claim 6, wherein in the furnace construction stage, the heat storage bricks are transported from the relay deck to the work section using the lifting device.

8. In the furnace construction preparation stage, a partition sheet whose height is adjustable is used as the partition material, 7. The method for constructing a hot stove according to claim 6, wherein in the furnace construction stage, the height of the partition sheet is decreased as the height of the upper surface of the heat storage bricks increases.

9. In the furnace construction preparation stage, an external deck formed outside the furnace body and accessible to the work opening, and an external lifting device leading from the external deck to the ground are installed; 9. A method for constructing a hot air stove as described in any one of claims 6 to 8, wherein, in the furnace construction stage, the heat storage bricks are transported from the ground to the external deck by the external lifting device, and the heat storage bricks transported to the external deck are transported to the relay deck through the work opening.

10. A method for constructing a hot stove by dismantling the heat storage bricks inside the furnace body and then constructing the furnace body, comprising the steps of: In a dismantling preparation stage, a relay deck that allows access to the outside of the furnace through a work opening is installed on the upper part of the furnace body, and a plurality of work sections are formed between the relay deck and the upper surface of the heat storage bricks and separated by vertical partitions, In a dismantling stage, the upper surfaces of the heat storage bricks are dismantled in each of the plurality of work sections, while dismantled brick chips are collected in any of the work sections and transported to the relay deck, and the work section from which the brick chips are collected is sequentially changed to another work section as the dismantling work progresses, This method for constructing a hot air stove includes, as a furnace construction step, constructing heat storage bricks on top of the heat storage bricks constructed on the bottom surface of the furnace body or inside the furnace body in each of a plurality of working sections, while transporting the heat storage bricks from the relay deck to one of the working sections, and sequentially changing the working section into which the heat storage bricks are transported to another working section as the construction work progresses.

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