JP6099469B2 - Furnace structure, construction method and dismantling method thereof - Google Patents

Description

  The present invention relates to a furnace structure, and more particularly, municipal waste such as mixed collection waste, separated collection waste and oversized waste; waste such as sewage sludge, rubber, tires and shells; other waste (waste oil, sludge, The present invention relates to a furnace structure for a waste gasification and melting furnace used for processing metal scrap and the like.

  As a facility for processing general waste and industrial waste, etc., these wastes are loaded into the melting furnace from the top of the furnace together with auxiliary materials such as coke and limestone and processed to recover slag and metal from the waste. A waste gasification melting furnace is known (see Patent Documents 1 and 2).

  As shown in FIG. 12, the waste gasification and melting furnace 50 has a gas collection part 1, a shaft part 2, a taper part 3, and a furnace bottom part 4 arranged from the upper side to the lower side. ) 5 are connected in series. The iron shell 5 constitutes the outer periphery of the melting furnace 50 and is intended for gas sealing. A fireproof structure 6 is formed inside the iron shell 5. The refractory structure 6 is formed by providing a mold in the iron shell 5 and pouring an uncured amorphous refractory into the iron shell 5 or spraying the amorphous refractory onto the inner surface of the iron shell 5. . The fireproof structure 6 is configured to accommodate waste, and the inner diameter of the cavity is, for example, about 1.5 m depending on the scale of the melting furnace 50.

  The waste gasification and melting furnace 50 has an inner cylinder 7a for charging waste and coke, and a pipe 7b for discharging gas to the side thereof, and an upper tuyere 8a and a lower tuyere. There is a mouth 8b and a tap hole 9 at the bottom.

  With the operation of the waste gasification and melting furnace, the refractory structure 6 is worn or worn, so that the refractory structure 6 is disassembled and replaced with a new one while the iron skin 5 remains. The dismantling work of the refractory structure section 6 is performed by human power, that is, the operator uses a rock drill.

Japanese Patent Laid-Open No. 11-221545 JP 2002-115826 A

  In recent years, refractories used in melting furnaces are required to have a longer life, and accordingly, the strength is increased. In particular, a silicon carbide refractory as described in JP 2009-133507 A is a very hard and hard material. For this reason, dismantling by human power using a rock drill requires a lot of time and labor.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a furnace structure for a waste gasification melting furnace that can be easily dismantled. Another object of the present invention is to provide a construction method and a dismantling method for the furnace structure.

  The present invention is a furnace structure for a waste gasification melting furnace, which is made of a refractory material and has a refractory structure part having a cavity for containing waste inside, and covers the outer periphery of the refractory structure part. The steel shell for maintaining the airtightness of the fireproof structure, and extending in the vertical direction from the outer periphery to the inside of the refractory structure, and preferentially breaking when force is applied from the outside to the inside of the refractory structure And at least two pairs of fractured surfaces having thermal conductivity, the first set of fractured surfaces are provided so as to be away from each other inward from the outer periphery of the refractory structure, and the second set of fractured surfaces Are provided so as to be away from each other toward the inside from the outer periphery of the refractory structure and are located on the opposite side of the first set of planned fracture surfaces across the core of the melting furnace.

  In the said furnace structure, the two planned fracture surfaces which make a pair are provided so that it may mutually distance toward the inner side from the outer periphery of a refractory structure part. For this reason, when dismantling the refractory structure part, by applying a force from the outside (iron skin side) to the inside of the refractory structure part, the planned fracture surface breaks and can be disassembled in the furnace as a block. That is, at the time of dismantling, the contact between adjacent blocks can be eliminated. The disassembled fireproof structure block may be lifted from the top of the furnace and taken out of the furnace. If the refractory structure part cannot be taken out of the furnace as a block and the entire refractory structure part is dismantled manually using a rock drill, it takes an extremely large amount of time and labor. The present invention is particularly useful when the refractory structure is made of a material having a high strength and a high hardness such as a silicon carbide refractory.

  The planned fracture surface is lower in strength than the other regions of the refractory structure, and has thermal conductivity. Since the planned fracture surface has thermal conductivity, the heat in the furnace is transmitted through the refractory structure during the operation of the melting furnace, and is efficiently dissipated from the iron skin. If the thermal conductivity of the planned fracture surface is inadequate, heat will accumulate in the refractory structure and the internal temperature will rise.For this reason, even if the iron skin is cooled with water or air, the durability of the melting furnace will be increased. May be insufficient.

  The planned fracture surface may extend from the outer periphery to the inner periphery of the fireproof structure, or from the outer periphery of the fireproof structure to the middle position in the thickness direction of the fireproof structure. When the planned fracture surface is from the outer periphery of the refractory structure to the middle position in the thickness direction, the position is exposed when the melting furnace is used and the refractory structure is worn and eroded to a depth that requires refurbishment. Up to that. By making the planned fracture surface up to a position in the middle of the thickness direction of the refractory structure part, the inner periphery of the refractory structure part can be constructed integrally, and there is no planned fracture surface that causes discontinuity A decrease in thermal conductivity can also be suppressed.

  The planned fracture surface can be formed by embedding a metal plate in the fireproof structure. In this case, the fire-resistant structure portion is arranged by placing two sets of metal plates forming the two sets of planned fracture surfaces on the inner surface of the iron skin, and then setting the material that becomes the fire-resistant structure portion by hardening on the inner periphery of the iron skin. Can be built. The present invention provides a method for constructing a furnace structure including such a refractory structure. That is, in the construction method, two sets of metal plates forming two sets of planned fracture surfaces are disposed on the inner surface of the iron shell, and a material that becomes a fireproof structure part by hardening is cast or sprayed on the inner periphery of the iron shell. Steps in this order.

  The planned fracture surface may be a joint formed by dividing the fireproof structure portion into a plurality of blocks and shifting the timing for constructing the plurality of blocks. In this case, the refractory structure section is constructed by building a plurality of blocks separated from each other into the first group in the iron shell, and then separating the material that becomes the blocks divided into the second group by hardening from the first group. It can be constructed by placing or spraying between. The present invention provides a method for constructing a furnace structure including such a refractory structure. That is, the construction method includes a step of constructing a plurality of blocks separated from each other in the first group in the iron shell, and a block separated from the first group by a material that becomes a block divided into the second group by curing. And placing or spraying in this order. The joint is a joint at the boundary where the joint is made, and is sometimes called a cold joint.

  As described above, the rupture-predicted surface extending in the vertical direction is provided in the fireproof structure, and the fireproof structure extends in the horizontal direction (for example, the horizontal direction) so as to be divided into a plurality of blocks divided in the vertical direction. One or more planned fracture surfaces may be provided in the fireproof structure. By adopting such a configuration, the fireproof structure can be blocked in the circumferential direction and the height direction. Thereby, for example, when it is necessary to disassemble the vertically long fire-resistant structure portion, the fire-resistant structure portion can be disassembled for each block, and the work can be performed more efficiently.

  Furthermore, the present invention provides a method for dismantling the furnace structure. That is, in the disassembling method according to the present invention, the block of the fireproof structure portion between the first set of planned fracture surfaces and the block of the fireproof structure portion between the second set of planned fracture surfaces are respectively inward from the iron skin side. A step of pushing and dismantling. After performing this dismantling process, if necessary, the work which cuts the metal plate which formed the fracture plan surface is performed. Then, the dismantling operation | work of a fireproof structure part can be implemented efficiently by implementing the process of pushing in the remaining block inside from an iron-skin side, and disassembling. A jack can be used to push each block and the remaining blocks between the two pairs of planned fracture surfaces. The block of the refractory structure pushed out into the furnace may be lifted from the top of the furnace and taken out of the furnace.

  According to the present invention, a furnace structure for a waste gasification melting furnace that can be easily dismantled, and a construction method and a disassembly method thereof are provided. That is, by dividing the fireproof structure portion of the furnace structure into a plurality of blocks according to the planned fracture surface, the fireproof structure portion can be taken out of the furnace while being in a block state. For this reason, it is possible to reduce as much as possible the work of holding a high-strength and hard fireproof structure, thereby reducing the time, labor and cost required for the dismantling work.

1 is a cross-sectional view schematically showing a first embodiment of a furnace structure according to the present invention. It is a cross-sectional view which shows typically the process of constructing the furnace structure shown in FIG. It is a cross-sectional view which shows typically the process of dismantling the fireproof structure part which concerns on 1st embodiment which was worn out by use. It is a cross-sectional view which shows typically 2nd embodiment of the furnace structure which concerns on this invention. It is a cross-sectional view which shows typically the process of constructing the furnace structure shown in FIG. It is a cross-sectional view which shows typically the process of dismantling the fireproof structure part which concerns on 2nd embodiment worn by use. It is a cross-sectional view which shows typically 3rd embodiment of the furnace structure which concerns on this invention. It is a cross-sectional view which shows typically the process of constructing the furnace structure shown in FIG. It is a cross-sectional view which shows typically the process of dismantling the fireproof structure part which concerns on 3rd embodiment worn by use. It is a longitudinal cross-sectional view which shows typically the process of dismantling a vertically long fireproof structure part. It is a cross-sectional view which shows typically other embodiment (the cross section of an external shape is a substantially rectangular shape) of the furnace structure which concerns on this invention. It is a longitudinal cross-sectional view which shows typically an example of the waste gasification melting furnace which can employ | adopt the furnace structure of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

<First embodiment>
FIG. 1 is a cross-sectional view schematically showing a first embodiment of a furnace structure according to the present invention. The furnace structure 10 shown in the figure can be employed in, for example, the shaft part 2, the taper part 3, and the furnace bottom part 4 in the waste gasification melting furnace 50 shown in FIG. The furnace structure 10 includes an iron shell 5, a refractory structure 16, and four pairs of planned fracture surfaces P1, P3, P2, and P4. Each configuration will be described below.

  The refractory structure 16 is made of a refractory material and has a cavity for accommodating waste inside. Examples of the material of the refractory structure 16 include silicon carbide refractories and alumina refractories. Among these materials, silicon carbide refractories have particularly high strength and hardness, and conventional furnace structures made of such materials are difficult to dismantle. According to the present embodiment, as described later, the fireproof structure 16 can be easily disassembled even when a silicon carbide refractory is employed. The thickness in the radial direction of the refractory structure 16 can be in the range of 100 to 700 mm.

  The iron shell 5 is for ensuring the airtightness of the melting furnace 50 and covers the outer periphery of the refractory structure 16. Examples of the material of the iron shell 5 include general structural rolled steel (SS400). Usually, the thickness of the iron shell 5 is about 6 to 30 mm. The iron shell 5 includes eight openings 5a, flanges 5b provided in the respective openings 5a, and closing plates 5c attached to the respective flanges 5b. These configurations are not shown in FIG. The closing plate 5c closes the opening in the flange 5b communicating with the opening 5a so that the internal gas does not leak outside when the melting furnace 50 is in operation. On the other hand, when disassembling the fireproof structure 16, the jack 25 can be fixed to the flange 5b with the piston rod 25a of the jack 25 inserted into the opening 5a after the closing plate 5c is removed. By operating the jack 25 in this state, a force can be applied to the refractory structure 16 in the furnace by the piston rod 25a (see FIG. 3). As the jack 25, a hydraulic jack can be used.

  As shown in FIG. 1, the four pairs of planned fracture surfaces P1, P3, P2, and P4 are formed in the refractory structure 16 while shifting the angle by 90 degrees in plan view with the core CL of the melting furnace 50 as the center. When the pair of planned fracture surfaces P1 is a first set of planned fracture surfaces, the pair of fracture planned surfaces P2 on the opposite side across the core CL corresponds to the second set of planned fracture surfaces. When the pair of planned fracture surfaces P3 is a first set of planned fracture surfaces, the pair of planned fracture surfaces P4 on the opposite side across the core CL corresponds to the second set of planned fracture surfaces. The pair of planned fracture surfaces P1 includes two planned fracture surfaces P1a and P1b. Similarly, the pair of planned fracture surfaces P2 includes the planned fracture surfaces P2a and P2b, the pair of planned fracture surfaces P3 includes the planned fracture surfaces P3a and P3b, and the pair of planned fracture surfaces P4 includes the planned fracture surfaces P4a and P4b.

  As shown in FIG. 1, four pairs of planned fracture surfaces P1, P3, P2, and P4 (a total of eight planned fracture surfaces) are divided into four blocks 16A and four blocks 16B that can divide the fireproof structure 16 in the circumferential direction. doing. Blocks 16A and blocks 16B are alternately arranged. All of the above-described eight planned fracture surfaces are flat and extend in the vertical direction and extend from the outer periphery to the inner periphery of the refractory structure 16. Since the four pairs of planned fracture surfaces P1, P3, P2, and P4 have the same configuration as each other, the configuration will be described by taking a pair of planned fracture surfaces P1 (P1a, P1b) as an example.

  The planned fracture surfaces P1a and P1b are provided so as to move away from the outer periphery of the fireproof structure 16 toward the inner periphery. When a force is applied to the block 16A between these surfaces from the outside toward the inside by the jack 25, the planned fracture surfaces P1a and P1b are preferentially broken. The angle (angle θ in FIG. 1) formed by the planned fracture surface P1a and the planned fracture surface P1b is preferably 1 ° or more, and more preferably 3 ° or more. If the angle θ is less than 1 °, it is difficult to push the block 16A with the jack 25. The angle θ depends on the scale of the melting furnace 50 and the thickness of the refractory structure 16, and the upper limit is about 10 °.

  In the present embodiment, the planned fracture surfaces P1a and P1b are formed by embedding a metal plate 18 in the fireproof structure 16. Examples of the material of the metal plate 18 include a steel plate and an aluminum plate from the viewpoint of sufficient thermal conductivity and heat resistance. Among these, a steel plate is particularly suitable from the viewpoint of workability and cost. What is necessary is just to set the thickness of the metal plate 18 according to the intensity | strength and thermal conductivity of a material, Preferably it is about 1.0-10 mm, More preferably, it is about 3.0-6.0 mm.

  The iron shell 5 has an opening 5a at a position corresponding to the substantially central portion of the outer periphery of the block 16A so that a force can be efficiently applied to the block 16A from the outside. In other words, the fracture-scheduled surfaces P1a and P1b are formed at positions suitable for pushing the iron shell 5 from the opening 5a. Note that the iron shell 5 has an opening 5a at a position corresponding to the substantially central portion of the outer periphery of the block 16B so that a force can be applied to the block 16B from the outside efficiently.

  In addition, in order to prolong the service life of the fireproof structure 16, a pipe line (not shown) for flowing cooling water or air may be provided on the surface of the iron shell 5. In this case, the metal plate 18 is also cooled by cooling the iron shell 5 and the refractory structure 16, and deformation due to excessive temperature rise is suppressed. Since the metal plate 18 extending from the iron shell 5 is embedded in the fireproof structure portion 16, the heat of the fireproof structure portion 16 is transferred to the iron skin 5 through the metal plate 18, thereby cooling the fireproof structure portion 16. Can be increased.

  As shown in FIG. 12, when the refractory structure 6 is vertically long, it is preferable to form a planned fracture surface H that divides the refractory structure 16 into a plurality of blocks divided in the vertical direction. In the present embodiment, a plurality of planned fracture surfaces H are formed in the horizontal direction, and the fireproof structure 16 is divided into a plurality of blocks in the circumferential direction and the height direction (see FIG. 10). Thereby, at the time of the update of the fireproof structure part 16, it can disassemble for every said block, and can implement | achieve work | work more efficiently. Note that the planned fracture surface H extending in the lateral direction may be formed by the metal plate 18 as described above, or may be formed by a joint to be described later.

  FIG. 2 is a diagram schematically showing the process of constructing the furnace structure 10. The furnace structure 10 can be constructed through the following steps. First, the eight metal plates 18 forming the eight planned fracture surfaces are arranged in the iron shell 5 by welding at predetermined positions and angles (FIG. 2 (a)). Then, the material 15 which becomes the fireproof structure 16 by curing is constructed by placing or spraying on the inner periphery of the iron shell 5 (FIG. 2B).

  FIG. 3 is a diagram schematically showing a process of disassembling the refractory structure 16 of the furnace structure 10. The fireproof structure 16 can be disassembled through the following steps regardless of whether or not it is worn by use. First, the jack 25 is arrange | positioned to the flange 5b of the position corresponding to the block 16A of the fireproof structure part between the fracture | rupture planned surfaces P1a and P1b (FIG. 3 (a)). In addition, the front end side of the metal plate 18 exposed with the wear of the refractory structure 16 is not worn with the refractory. Next, the block 16A is pushed inward from the iron shell 5 side by the piston rod 25a of the jack 25 to be disassembled (FIG. 3B). Further, the remaining three blocks 16A are respectively pushed inward from the iron shell 5 side to be disassembled (FIG. 3C).

  Next, the metal plate 18 that has formed the planned fracture surface is cut off. Note that the exposed metal plates 18 may be sequentially cut off when the four blocks 16A are sequentially disassembled. After the metal plate 18 is excised, the remaining four blocks 16B are pushed inward by the jack 25 from the iron shell 5 side and disassembled (FIG. 3 (d)). A gap is created by first disassembling the block 16A sandwiched between two pairs of planned fracture surfaces P2a and P2b, whereby the block 16B can be pushed by the jack 25. The blocks 16A and 16B disassembled in the iron shell 5 may be lifted from the top of the furnace and taken out of the furnace.

  The furnace structure 10 can break the planned fracture surface by a relatively simple operation of applying a force to the fireproof structure portion 16 from the iron shell 5 side to the inside with the jack 25, and the fireproof structure portion 16. The blocks 16A and 16B formed by dividing can be taken out of the furnace. For this reason, the operation | work which hangs the fireproof structure part 16 manually with a rock drill can be reduced as much as possible.

<Second embodiment>
In the furnace structure 20 according to the present embodiment, the eight planned fracture surfaces do not reach the inner periphery of the refractory structure 16 and are provided up to a position in the thickness direction of the refractory structure 16. The configuration is the same as that of the furnace structure 10 according to the first embodiment. Hereinafter, the configuration related to this difference will be mainly described.

  As shown in FIG. 4, in the furnace structure 20, the metal plates 28 forming the four pairs of planned fracture surfaces P <b> 1, P <b> 3, P <b> 2, P <b> 4 do not reach the inner periphery of the refractory structure 16. The area near the circumference consists of refractories only. That is, since the metal plate 28 that causes discontinuity in physical properties such as thermal conductivity does not exist, a configuration in which distortion due to heat or the like hardly occurs can be achieved. The position of the tip portion 28a of the metal plate 28 may be set to a position where it is exposed when the melting furnace 50 is used and the refractory structure portion 16 is worn and eroded to a depth that requires replacement.

  FIG. 5 is a diagram schematically showing the process of constructing the furnace structure 20. The furnace structure 20 can be constructed through the following steps. First, the eight metal plates 28 forming the eight planned fracture surfaces are arranged in the iron shell 5 by welding at predetermined positions and angles (FIG. 5A). Thereafter, the material 15 that becomes the fireproof structure 16 by hardening is cast or sprayed on the inner periphery of the iron shell 5 to construct a state in which the tip portion 28a of the metal plate 18 is buried (FIG. 5B). Then, in order to build integrally from the furnace bottom part 4 to the shaft part 2 about the inner periphery vicinity of the fireproof structure part 16, the material 15 is cast or sprayed on the inner periphery 16a (FIG.5 (c)). Note that it is not always necessary to integrally construct the vicinity of the inner periphery.

  FIG. 6 illustrates a method for dismantling the refractory structure 16 of the furnace structure 20. The refractory structure 16 is assumed to be used until the inner peripheral side of the refractory structure 16 is worn and the tip 28a of the metal plate 28 is exposed, and then disassembled. As shown in FIG. 6, the method of dismantling the refractory structure 16 of the furnace structure 20 is the same as that of the refractory structure 16 of the furnace structure 10 except that the inner peripheral side of the refractory structure 16 is significantly worn. Can be dismantled.

<Third embodiment>
The furnace structure 30 according to the present embodiment divides the joints (cold joints) at the time of construction, that is, the refractory structure portion into a plurality of blocks instead of forming the eight planned fracture surfaces by the metal plate 18, and It has the same configuration as that of the furnace structure 10 according to the first embodiment except that it is formed by shifting the timing of building the block. Hereinafter, the configuration related to this difference will be mainly described.

  As shown in FIG. 7, four pairs of planned fracture surfaces C1, C3, C2, and C4 of the furnace structure 30 are formed by joints. Since the blocks 26A and 26B on both sides of the joint are in close contact with each other, heat conduction is not hindered by the joint, whereas the structural joint force is weak, so that the joint has the planned fracture surfaces C1, C3, C2, and C4. Can be.

  FIG. 8 is a diagram schematically showing a process of constructing the furnace structure 30. The fireproof structure 26 can be constructed through the following steps. First, a plurality of blocks 26A separated from each other in the first group are constructed in the iron shell 5 by placing or spraying a material 15 that becomes a refractory by hardening (FIG. 8A). Next, the block 26B divided into the second group is constructed by placing or spraying between two adjacent blocks 26A (FIG. 8B). The construction method according to the present embodiment does not require the work of arranging the metal plate 18 in the iron shell 5. Note that the four blocks 26B may be constructed first, and then the four blocks 26A may be constructed.

  FIG. 9 is a diagram schematically showing a process of disassembling the refractory structure 26 of the furnace structure 30. The fireproof structure 26 can be disassembled in the same manner as the fireproof structure 16 according to the first embodiment regardless of whether or not it is worn by use. However, in this embodiment, since the metal plate 18 that forms the planned fracture surface is not used, the work of cutting the metal plate 18 is unnecessary.

  In addition, when constructing the refractory structure portion 26, when the planned fracture surface H extending in the lateral direction is provided by the joint, the upper block is pushed out by the piston rod 25a as shown in the longitudinal sectional view of FIG. After that, the block located below can be pushed out by the piston rod 25a. By preparing such work, the dismantling work can be performed efficiently even if the fireproof structure 26 is vertically long.

  The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the outer shape (cross-sectional shape in the lateral direction) of the fireproof structure is circular is illustrated, but the outer shape of the fireproof structure may be substantially rectangular as shown in FIG. Other shapes may also be used. Moreover, the cross-sectional shape of the cavity in the center of the fireproof structure is not limited to a circle, and may be an ellipse or a polygon. Furthermore, the fireproof structure may have a structure in which two or more layers are laminated in the thickness direction.

  Moreover, in the said embodiment, although the case where the fracture | rupture planned surface was planar was illustrated, the fracture | rupture planned surface is not limited to planar shape, A curved surface shape may be sufficient. In other words, as long as the pair of planned fracture surfaces are provided so as to be away from each other toward the inside from the outer periphery of the fireproof structure, they may be curved (curved in the sectional view).

  In the said embodiment, although the case where a total of eight fracture plan surfaces were provided in a fireproof structure part was illustrated, the number of fracture plan surfaces is not limited to this. Since the size of the block generated at the time of disassembly depends on the number (interval) of the planned fracture surfaces, it may be set as appropriate so that the block size is easy to carry out from the furnace.

5 ... Iron skin 10, 20, 30 ... Furnace structure, 16, 26 ... Fireproof structure, 16A, 16B, 26A, 26B ... Block (fireproof structure), 18 ... Metal plate, 25 ... Jack, 25a ... Piston Rod, 28 ... metal plate, 28a ... tip of metal plate, 50 ... waste gasification and melting furnace, C1, C3, C2, C4 ... planned fracture surface by joint, CL ... core, H ... planned fracture in the lateral direction Surfaces P1, P3, P2, P4 ... Planned fracture surfaces forming pairs, P1a, P1b, P2a, P2b, P3a, P3b, P4a, P4b ... Planned fracture surfaces by metal plates.

Claims (13)

A furnace structure for a waste gasification melting furnace,
A refractory structure made of a refractory material and having a cavity for containing waste inside;
An iron skin covering the outer periphery of the refractory structure and maintaining the airtightness of the melting furnace;
At least two pairs having thermal conductivity and preferentially breaking when a force is applied from the outside to the inside of the refractory structure, extending in the vertical direction from the outer periphery of the refractory structure. Planned fracture surface,
With
The first set of planned fracture surfaces are provided so as to be away from each other toward the inside from the outer periphery of the fireproof structure part,
The second set of planned fracture surfaces are provided so as to be away from each other inward from the outer periphery of the refractory structure and are located on the opposite side of the first set of fracture planned surfaces across the core of the melting furnace. Furnace structure.   The furnace structure according to claim 1, wherein the planned fracture surface extends from an outer periphery to an inner periphery of the fireproof structure.   The furnace structure according to claim 1, wherein the planned fracture surface is formed from an outer periphery of the fireproof structure portion to a position in the middle of the thickness direction of the fireproof structure portion.   4. The furnace structure according to claim 3, wherein the planned fracture surface is formed up to a position that is exposed when the melting furnace is used and the refractory structure is worn and eroded to a depth that requires replacement.   The furnace structure according to any one of claims 1 to 4, wherein the refractory structure is made of a silicon carbide refractory. The planned fracture surface consists of the surface of a metal plate embedded in the fireproof structure,
The fireproof structure portion is arranged on the inner periphery of the iron skin by hardening after placing two sets of metal plates forming the two sets of planned fracture surfaces on the inner surface of the iron skin. Or the furnace structure as described in any one of Claims 1-5 constructed | assembled by spraying. The planned fracture surface is formed by dividing the fireproof structure portion into a plurality of blocks and shifting the timing of constructing the plurality of blocks,
The refractory structure part includes a plurality of blocks separated from each other in the first group in the iron skin, and then a material that becomes a block divided into the second group by hardening is separated from the block in the first group. The furnace structure according to any one of claims 1 to 5, wherein the furnace structure is constructed by placing or spraying between the two.   The furnace structure as described in any one of Claims 1-7 further provided with the to-be-ruptured surface extended in the horizontal direction so that the said fireproof structure part may be divided into the some block divided | segmented into the vertical direction. It is a construction method of the furnace structure according to claim 6,
Arranging two sets of metal plates forming the two sets of planned fracture surfaces on the inner surface of the iron skin;
Placing or spraying the material that becomes the fireproof structure by curing on the inner periphery of the iron skin; and
A furnace structure construction method comprising: It is a construction method of the furnace structure according to claim 7,
Building a plurality of blocks separated from each other in the first group in the iron skin;
Placing or spraying a material that becomes a block divided into a second group by curing between the separated blocks of the first group;
A furnace structure construction method comprising: A method for disassembling a furnace structure according to any one of claims 1 to 8,
The step of dismantling the block of the fireproof structure portion between the first set of planned fracture surfaces and the block of the fireproof structure portion between the second set of planned fracture surfaces inward from the iron skin side, respectively. A dismantling method comprising:   The dismantling method according to claim 11, further comprising a step of pushing the remaining blocks inward from the iron skin side and disassembling.   The dismantling method according to claim 11 or 12, wherein the pushing of the block is performed with a jack.

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