Furnace inner wall support structure

Abstract

To provide a support structure for a furnace inner wall usable without problems even when a furnace in which a distance between an outer wall and anchor bricks is not fixed is constructed or when a furnace in which a distance between the outer wall of a boiler and anchor bricks is close is constructed, and capable of expressing high support strength.SOLUTION: In a wall face of a combustion furnace 1, cylindrical bodies 5, 5 are fitted to an inside face of an outer wall 2, and further, an insertion hole 11 is drilled in anchor bricks 3a, 3a located on an inner side of the outer wall 2 and in the vicinity of the cylindrical bodies 5, 5. Then, a bent part of a first L-shaped metal fitting 6 is inserted into the cylindrical bodies 5, further, a bent part of a second L-shaped metal fitting 6 is inserted into the insertion hole 11 of the anchor bricks 3a, and the first L-shaped metal fitting 6 and the second L-shaped metal fitting 6 are welded so as to be integrated.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] This invention relates to a support structure for supporting an inner wall of an incinerator or melting furnace having an inner wall made of a plurality of firebricks laid inside a metal outer wall, to prevent the inner wall from detaching from the outer wall. [Background technology]

[0002] In incinerators and melting furnaces, a heat-resistant inner wall is often provided by laying (assembling while fixing) a number of firebricks inside a metal outer wall. However, in such incinerator and melting furnace walls, a defect occurs in that the firebricks protrude inward due to thermal expansion and the like as a result of continued use. Therefore, in order to eliminate such a defect, as shown in Patent Document 1, a support structure for the furnace inner wall is known in which a support metal fitting extending continuously in the horizontal direction is welded to the inner surface of the outer wall at a predetermined interval in the vertical direction, one tip of an anchor (tension metal fitting) formed in an inverted U shape is engaged with the mounting metal fitting, and the other tip of the anchor is engaged with an insertion hole drilled in the firebrick (anchor brick).

[0003] However, since the outer wall of a boiler-type furnace is composed of water-cooled pipes and metal plates, when constructing the furnace using the furnace inner wall support device of Patent Document 1, firebricks (anchor bricks) with insertion holes cannot be installed at a fixed distance from the outer wall, so multiple types of tension fittings must be prepared to match the distance between the support fittings welded to the outer wall and the anchor bricks, making the work complicated. Also, since the outer wall of a normal furnace deforms due to heat when used, even when repairing using the furnace inner wall support device of Patent Document 1, multiple types of tension fittings must be prepared, making the work complicated.

[0004] As described above, when engaging a metal exterior wall and an anchor brick with a tension fitting, in order to deal with situations in which there is variation in the distance between the support fitting welded to the exterior wall and the anchor brick, a tension fitting has been developed in which two L-shaped fittings, one of which has a screw thread at the tip, are connected by a cylindrical socket with a screw groove, so that the length can be adjusted, as shown in Patent Document 2. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2-192590 [Patent Document 2] Japanese Patent Application Publication No. 6-11269 Summary of the Invention [Problem to be solved by the invention]

[0006] Although the tension fittings of Patent Document 2 can accommodate variations in the distance between the support fittings welded to the exterior wall and the anchor bricks by adjusting the length, they are time-consuming to manufacture, which increases the cost of construction and repair. Furthermore, the tension fittings of Patent Document 2 are adjusted in length by a screw mechanism, and require a certain length, so they cannot be used in the construction or repair of furnaces in which there is no insulating layer between the exterior wall and the firebricks and the distance between them is short, such as boiler-type furnaces in which the exterior wall is cooled by an integrated water-cooling pipe.

[0007] The object of the present invention is to provide a support structure for a furnace inner wall which eliminates the problems associated with the above-mentioned conventional support structures and support fittings for the furnace inner wall, can be used without problems even when constructing (constructing or repairing) a furnace in which the distance between the outer wall and the anchor bricks is not constant, or when constructing a furnace such as a boiler-type furnace in which the distance between the outer wall and the anchor bricks is short, allows construction work to be carried out cheaply and easily, and is capable of exhibiting high support strength. [Means for solving the problem]

[0008] The invention described in claim 1 of the present invention is a support structure for supporting an inner wall of a furnace having an inner wall formed by laying a plurality of firebricks inside a metal outer wall so that the inner wall does not come off from the outer wall, in which a cylindrical body is attached to the inner surface of the outer wall, and an insertion hole is drilled in a firebrick laid inside the outer wall and near the cylindrical body, a bent portion of a first L-shaped metal fitting (tensile fitting) is inserted into the cylindrical body, and a bent portion of a second L-shaped metal fitting (tensile fitting) is inserted into the insertion hole of the firebrick, and the first L-shaped metal fitting and the second L-shaped metal fitting are fixed to each other. And, The refractory brick having the insertion hole is The second L-shaped metal fitting The recessed portion into which the portion other than the bent portion is fitted is characterized in that it is formed in a substantially triangular shape with the insertion hole as its apex.

[0010] Claim 2 The invention described in Claim 1 In the invention described in the above, the periphery of the recessed portion is tapered. Effect of the Invention

[0011] The support structure for the furnace inner wall described in claim 1 connects the outer wall and the inner wall by fixing a first L-shaped metal fitting (tension fitting) engaged with the cylindrical body of the outer wall and a second L-shaped metal fitting (tension fitting) engaged with the insertion hole of the anchor brick. Therefore, it can be used without problems even when constructing a furnace where the distance between the outer wall and the anchor brick is not constant, or when constructing a furnace such as a boiler where the distance between the outer wall and the anchor brick is short, allowing furnace construction work to be performed cheaply and easily, and capable of exhibiting high support strength.

[0012] Claim 1 The support structure of the furnace inner wall described in SecondThe recessed portion for fitting the portion other than the bent portion of the L-shaped metal fitting is formed in a triangular shape with the insertion hole as the apex, and there is a large degree of freedom in the layout when fitting the first L-shaped metal fitting with its bent portion inserted into the cylindrical body of the outer wall and the second L-shaped metal fitting with its bent portion inserted into the insertion hole of the anchor brick into the recessed portion. In other words, even if the relative position of the anchor brick to the cylindrical body of the outer wall is slightly misaligned, the first L-shaped metal fitting and the second L-shaped metal fitting can be stored in the recessed portion. Therefore, the support structure for the furnace inner wall described in claim 2 makes the construction and maintenance of the furnace very easy.

[0013] Claim 2 In the support structure of the furnace inner wall described above, the periphery of the concave portion is tapered, so that during construction and maintenance of the furnace, the periphery (ridge line) of the concave portion is less likely to be damaged or cracked due to a collision with the L-shaped metal fitting. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is an explanatory diagram showing the inside of a furnace that employs a support structure for the furnace inner wall (a schematic diagram showing a part of the furnace as viewed from the inside). [Diagram 2] This is a horizontal cross section (cross section along line AA in Figure 1) of the furnace with the support structure for the furnace inner wall. [Diagram 3] This is a vertical cross section of the furnace (cross section taken along line BB in Figure 2) that employs a support structure for the furnace inner wall. [Figure 4] 1A, 1B, and 1C are explanatory views showing firebricks (anchor bricks) used in the support structure of the furnace inner wall (a is a front view, b is a plan view, and c is a left side view). [Diagram 5] FIG. 1 is an explanatory diagram showing a metal fitting (tension metal fitting) used in the support structure of the furnace inner wall (a is a front view, and b is a plan view). [Figure 6] FIG. 1 is an explanatory diagram (plan view) showing how metal fittings are stored in the concave portion of the anchor brick (a shows the case where the distance between the cylindrical body and the insertion hole is short, and b shows the case where the distance between the cylindrical body and the insertion hole is long). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a support structure for a furnace inner wall according to the present invention will be described in detail with reference to the drawings.

[0016] <Support structure of furnace inner wall> 1 to 3 show an example in which the support structure for the furnace inner wall according to the present invention is applied to a furnace (incinerator). The boiler-type incinerator 1 is formed in the shape of a hollow rectangular prism, and the outer periphery is covered by an outer wall 2 made of metal (steel). The outer wall 2 has a shape in which a large number of cylindrical water pipes (cooling water pipes) C, C, etc. are arranged vertically and connected with plates. Inside the outer wall 2, a large number of refractory bricks 3, 3, etc. formed in a rectangular parallelepiped shape are laid (assembled and fixed with mortar) to form a cylindrical shape of a predetermined thickness, thereby forming an inner wall 4 of a certain width. Furthermore, between the outer wall 2 and the inner wall 4, the inner wall 4 is fixed to the outer wall 2 with mortar.

[0017] The wall surface consisting of the outer wall 2 and inner wall 4 of the incinerator 1 is provided with a support structure S for the inner wall, which uses cylindrical bodies 5, 5·· fixed in a scattered pattern to the inner surface of the outer wall 2, anchor bricks 3a, 3a·· (fireproof bricks shown with diagonal lines in Figure 1) which are fireproof bricks located near the cylindrical bodies 5, 5··, and L-shaped metal fittings 6, 6·· which function as tension fittings.

[0018] The cylindrical body 5 is formed into a cylindrical shape with a predetermined inner diameter (φ16 mm) and a predetermined length (40 mm) by a metal plate (steel plate) of a predetermined thickness (2.0 mm). The cylindrical body 5 is fixed (welded) in a scattered manner with its longitudinal direction vertical to the inner surface (outwardly bulging portion) of the outer wall 2 which is made of steel and connects the cylindrical water pipes C, C... with a plate material.

[0019] Anchor bricks 3a, 3a..., with their surfaces treated, are arranged inside the exterior wall 2 adjacent to these cylindrical bodies 5, 5.... Fig. 4 shows the anchor brick 3a, which, like the other firebricks 3, 3..., is made of firebrick material (alumina-chromia material) and is formed into a rectangular parallelepiped shape with given dimensions (length x width x height = 230 mm x 180 mm x 98 mm).

[0020] A cylindrical insertion hole 11 having a predetermined inner diameter (φ16.0 mm) is drilled in the top surface of the anchor brick 3a, into which the bent portion of the L-shaped metal fitting 6 is inserted. Furthermore, a substantially isosceles triangular recess 12 is formed in the top surface of the anchor brick 3a, with the insertion hole 11 as its apex, and two sides forming the recess form an angle of approximately 90° (θ in FIG. 4(b)). The bottom surface of the recess 12 is flat, and is disposed parallel to the surface other than the recess 12 at a predetermined distance (16.0 mm).

[0021] In addition, a tapered surface 13 is formed in a band shape of a certain width (the same width as the inner diameter of the insertion hole 11) around the concave portion 12 of the anchor brick 3a, and the tapered surface 13 is inclined at 45° with respect to the surface. Furthermore, the tapered surface 13 covers the periphery of the base end of the insertion hole 11 in a circular arc.

[0022] The anchor bricks 3a, 3a... as described above are arranged adjacent to the cylindrical bodies 5, 5... that are arranged (welded) in a scattered manner on the inner surface of the exterior wall 2. The insertion holes 11 of the anchor bricks 3a, 3a... and the cylindrical bodies 5 welded to the exterior wall 2 are connected using two L-shaped metal fittings (tension fittings) 6, 6. Figure 5 shows the L-shaped metal fitting 6, which is formed by bending a round metal (steel) bar with a specified diameter (φ12 mm) at a right angle (the length of the bent portion 6a of the L-shaped metal fitting 6 is 40 mm, and the length of the horizontal base portion 6b is 80 mm).

[0023] 2, in the installation portion of the anchor bricks 3a, 3a, ... on the inside of the exterior wall 2, one L-shaped metal fitting 6 has its bent portion 6a inserted into the cylindrical body 5 welded to the inner surface of the exterior wall 2, and its base portion 6b is placed on the bottom surface of the recessed portion 12 of the anchor brick 3a. Also, another L-shaped metal fitting 6 has its bent portion 6a inserted into the insertion hole 11 of the anchor brick 3a, and its base portion 6b is placed on the bottom surface of the recessed portion 12 of the anchor brick 3a. The base portions 6b, 6b of these two L-shaped metal fittings 6, 6 are welded to each other, so that the two connecting metal fittings 6, 6 are integrated to connect the cylindrical body 5 welded to the inner surface of the exterior wall 2 and the anchor brick 3a.

[0024] <Effect of the support structure of the furnace inner wall> As described above, the support structure S for the furnace inner wall has the cylindrical bodies 5, 5... attached to the inner surface of the outer wall 2, the anchor bricks 3a, 3a... laid inside the outer wall 2 near the cylindrical bodies 5, the insertion holes 11 are drilled in the anchor bricks 3a, 3a..., the bent portion of the first L-shaped metal fitting 6 is inserted into the cylindrical body 5, the bent portion of the second L-shaped metal fitting 6 is inserted into the insertion hole 11 of the anchor brick 3a, and the first L-shaped metal fitting 6 and the second L-shaped metal fitting 6 are welded together. Therefore, such a support structure S for the furnace inner wall can be used without problems even when constructing a furnace in which the distance between the outer wall and the anchor bricks is not constant, or when constructing a furnace in which the distance between the outer wall and the anchor bricks is close, such as a boiler, and the furnace construction work can be performed cheaply and easily, and high support strength can be exhibited. In addition, because the incinerator 1 is a boiler-type furnace, if welding is performed directly to the exterior wall 2 during construction or repair, a water pressure test is required in a state where the exterior wall 2 can be seen before the firebricks 3, 3... are installed. However, as described above, if construction or repair is performed using the support structure S of the furnace inner wall, the L-shaped metal fittings 6, 6... are not welded to the exterior wall 2, so there is no need to perform a water pressure test after welding, and the work can be completed efficiently in a short amount of time.

[0025] In addition, in the support structure S for the furnace inner wall, the recessed portion 12 for fitting the portion other than the bent portion of the L-shaped metal fitting 6 into the anchor brick 3a having the insertion hole 11 drilled therein is formed in a substantially triangular shape with the insertion hole 11 as the apex, so that there is a large degree of freedom in the layout when fitting (storing) the first L-shaped metal fitting 6 with the bent portion 6a inserted into the cylindrical body 5 of the outer wall 2 and the second L-shaped metal fitting 6 with the bent portion 6a inserted into the insertion hole 11 of the anchor brick 3a into the recessed portion 12. That is, as shown in FIG. 6(b), even if the relative position (left-right position) of the anchor brick 3a to the cylindrical body 5 of the outer wall 2 is shifted by about 1 / 3 of the length of the anchor brick 3a in the vertical direction (up-down direction in FIG. 4(b)), the first L-shaped metal fitting 6 and the second L-shaped metal fitting 6 can be stored in the recessed portion 12. Therefore, the support structure S for the furnace inner wall makes the construction and maintenance of the furnace very easy.

[0026] Furthermore, since the support structure S for the furnace inner wall has a tapered periphery of the concave portion 12, it is unlikely that the periphery (ridge) of the concave portion 12 will be damaged or cracked due to a collision with the L-shaped metal fitting 6 during construction and maintenance of the furnace.

[0027] <Example of changes to the furnace inner wall support structure> The support structure of the furnace inner wall according to the present invention is not limited to the above-mentioned embodiment, and the materials, shapes, sizes, and other configurations of the outer wall, firebricks (anchor bricks), cylindrical bodies, and L-shaped metal fittings (tension metal fittings) can be appropriately changed as needed without departing from the spirit of the present invention. Furthermore, the type and structure of the furnace that employs the support structure of the furnace inner wall according to the present invention are not limited to the above-mentioned embodiment, and can be appropriately changed as needed.

[0028] For example, the support structure for the furnace inner wall according to the present invention is not limited to the above embodiment in which a first L-shaped metal fitting with a bent portion inserted into a cylindrical body and a second L-shaped metal fitting with a bent portion inserted into an insertion hole in a firebrick are welded together, but it is also possible to change the support structure for the furnace inner wall according to the present invention to one in which a first L-shaped metal fitting with a bent portion inserted into a cylindrical body and a second L-shaped metal fitting with a bent portion inserted into an insertion hole in a firebrick are screwed together using a bolt or the like.

[0029] Furthermore, the support structure for furnace inner walls according to the present invention is not limited to a triangular recess having an apex angle of 90° (with the insertion hole as its apex) for fitting the portions other than the bent portions of the L-shaped metal fittings, as in the above embodiment, and the shape of the recess can be appropriately changed as necessary. By making the recess a triangular shape with an apex angle (with the insertion hole as its apex) of 45° to 135°, it is possible to maintain a large degree of freedom in the layout when fitting the first L-shaped metal fitting and the second L-shaped metal fitting into the recess.

[0030] Furthermore, the support structure for furnace inner walls according to the present invention is not limited to one in which one anchor brick is connected (by two L-shaped metal fittings) to only one cylindrical body fixed to the outer wall as in the above embodiment, but can be modified to one in which one anchor brick is connected (by three or more L-shaped metal fittings) to two or more cylindrical bodies fixed to the outer wall (i.e., one in which two first L-shaped metal fittings are present), etc. In addition, the support structure for furnace inner walls according to the present invention is not limited to one in which a single second L-shaped metal fitting is engaged with a single insertion hole drilled in the anchor brick as in the above embodiment, but can be modified to one in which two or more insertion holes are drilled in the anchor brick and two or more second L-shaped metal fittings are engaged with the respective insertion holes, etc.

[0031] Furthermore, the support structure of the furnace inner wall according to the present invention is not limited to the cylindrical body welded to the outer wall being cylindrical, as in the above embodiment, but can also be changed to one in which the cylindrical body is a rectangular prism such as a square prism or an octagonal prism, or an elliptical prism, etc.

[0032] On the other hand, the furnace in which the support structure for the furnace inner wall of the present invention is adopted is not limited to one in which the inner wall is formed by assembling rectangular refractory bricks as in the above embodiment, but may be one in which the inner wall is formed by assembling refractory bricks whose inner and outer surfaces are curved to match the curved shape of the outer wall, etc.

[0033] Furthermore, the furnace in which the furnace inner wall support structure of the present invention is adopted is not limited to the above embodiment in which the inner wall is formed from refractory bricks made of alumina-chromia material and the outer wall and inner wall are fixed with mortar, and the material of the refractory bricks and the material filled between the outer wall and inner wall can be appropriately changed as necessary. [Industrial Applicability]

[0034] Since the support structure for a furnace inner wall according to the present invention has the excellent effects as described above, it can be suitably used as a support structure for supporting an inner wall made of firebricks so as not to detach from a metal outer wall in various furnaces such as incinerators and melting furnaces. [Explanation of symbols]

[0035] S··Furnace inner wall support structure 1. Incinerator 2. Exterior wall 3. Firebricks 3a Anchor bricks 4.Inner wall 5. Cylindrical body 6··L-shaped bracket (tension bracket) 11 Insertion hole 12...Concave part 13 Tapered surface

Claims

1. A support structure for supporting an inner wall of a furnace having an inner wall formed by laying a plurality of refractory bricks inside a metal outer wall, to prevent the inner wall from being detached from the outer wall, comprising: A cylindrical body is attached to the inner surface of the outer wall, An insertion hole is drilled in a firebrick laid on the inside of the outer wall near the cylindrical body, a bent portion of the first L-shaped metal fitting is inserted into the cylindrical body, a bent portion of the second L-shaped metal fitting is inserted into an insertion hole of the firebrick, and the first L-shaped metal fitting and the second L-shaped metal fitting are fixed to each other; The refractory brick having the insertion hole is a recessed portion into which the portion other than the bent portion of the second L-shaped metal fitting is fitted is formed in a substantially triangular shape with the insertion hole as a vertex.

2. 2. The support structure for a furnace inner wall according to claim 1, wherein the peripheral edge of said recessed portion is tapered.

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