JP6528593B2 - Glass melting furnace, method of raising temperature thereof and method of manufacturing glass article - Google Patents

Description

  The present invention relates to a glass melting furnace, a method of raising the temperature thereof, and a method of manufacturing a glass article.

  Conventionally, the side wall of the glass melting furnace is configured using a refractory (seed tile) and supported by a support from the outside (see Patent Document 1).

Japanese Patent Application Laid-Open No. 10-182167

  When raising the temperature of the glass melting furnace, the refractory constituting the side wall expands (thermal expansion). Since the expansion of the refractory is restrained by the support, thermal stress is generated in the refractory. There is a possibility that the refractory may be broken due to the increase of such thermal stress. Here, it is possible to avoid the above-mentioned breakage by finely adjusting the position of the support portion in the direction of separating from the refractory according to the expansion of the refractory. However, since it is difficult to visually recognize the expansion of the refractory, for example, when the work of finely adjusting the support portion is delayed, breakage of the refractory may be caused.

  The present invention has been made in view of these circumstances, and an object thereof is to provide a glass melting furnace capable of easily protecting a refractory constituting a side wall, a temperature raising method thereof, and a method of manufacturing a glass article. It is.

  The glass melting furnace which solves the above-mentioned subject is a glass melting furnace provided with the side wall constituted using refractory, and the supporting part fixed to the position which estranged from the side wall in the outward of the side wall, and the side wall And an intermediate portion interposed between the support portion and the intermediate portion, the intermediate portion being compressed by expansion of the refractory constituting the side wall, the fracture or deformation is given priority over the refractory. A buffer member having the following configuration.

According to this configuration, when the refractory constituting the side wall of the glass melting furnace expands, the buffer member is broken or deformed, thereby releasing the excessive thermal stress generated in the refractory.
In the glass melting furnace, the buffer member preferably has at least one of a recess and a through hole.

  As described above, the buffer member having at least one of the recess and the through hole has lower compressive strength than the buffer member in which the recess and the through hole are omitted. Therefore, the cushioning member having at least one of the recess and the through hole is suitable as a cushioning member which is broken or deformed in preference to the refractory constituting the side wall.

  In the glass melting furnace, preferably, the buffer member is in contact with the side wall and has at least one of an opening of the recess and an opening of the through hole at a position facing the side wall.

  Here, in the side wall of the glass melting furnace, the portion in contact with the buffer member is more difficult to dissipate heat than the other portions, and the temperature may be higher than the other portions. In this respect, according to the buffer member having at least one of the opening of the recess and the opening of the through hole at the position facing the side wall, the contact area between the side wall and the buffer member can be suppressed. This makes it possible, for example, to reduce temperature variations at the outer surface of the side wall.

In the glass melting furnace, preferably, the side wall has a longitudinal direction in a plan view, and the supporting portion and the intermediate portion are provided at respective positions on both sides of the side wall in the longitudinal direction.
According to this configuration, since the side wall in the longitudinal direction is supported by the support portion from both end sides, it is possible to suppress the formation of a gap between the plurality of refractories. However, since the expansion in the longitudinal side wall is larger than the lateral side wall, the thermal stress in the longitudinal side wall tends to be large. In such a glass melting furnace, the thermal stress of the refractory constituting the longitudinal side wall can be suitably released by providing an intermediate portion having a buffer member at each position on both ends of the longitudinal side wall. .

In the glass melting furnace, it is preferable that the buffer member is disposed corresponding to each of the plurality of refractories.
According to this configuration, it is possible to release the thermal stress generated in the plurality of refractories.

  In the glass melting furnace, preferably, the plurality of refractories include zirconia-based electroformed bricks, and the buffer members disposed corresponding to the zirconia-based electroformed bricks are chamotte-based bricks.

  Although the above-mentioned zirconia-based electroformed brick is excellent in durability, it tends to expand relatively larger than, for example, alumina-based electroformed brick in a predetermined temperature range. On the other hand, chamotte bricks have relatively low compressive strength. For this reason, when the durability of the side wall is enhanced by the zirconia-based electroformed brick, using the chamotte-based brick as the buffer member is advantageous as a configuration for suitably releasing the thermal stress of the zirconia-based electroformed brick.

The temperature rising method of the glass melting furnace which solves the said subject heats the said glass melting furnace.
According to this method, it is possible to release excessive thermal stress generated in the refractory constituting the side wall during the temperature rise of the glass melting furnace.

The manufacturing method of the glass article which solves the said subject manufactures a glass article using the said glass melting furnace.
According to this method, when raising the temperature of the glass melting furnace during the production of the glass article, it is possible to release the excess thermal stress generated in the refractory constituting the side wall.

  According to the present invention, the refractory constituting the side wall can be easily protected.

It is a top view explaining the glass melting furnace in an embodiment. (A) is an end elevation along the 2a-2a line of FIG. 1, (b) is an end elevation along the 2b-2b line of FIG. (A)-(g) is a partial end elevation showing a modification of a glass melting furnace.

  Hereinafter, embodiments of a glass melting furnace, a temperature raising method thereof and a method of manufacturing a glass article will be described with reference to the drawings. In the drawings, for convenience of explanation, a part of the configuration may be shown exaggerated. Also, the dimensional ratio of each part may be different from the actual one.

  As shown in FIG. 1, the glass melting furnace 11 is provided with the side wall 12 comprised using several refractory R (it is also called a "seed tile"). The side wall 12 of the glass melting furnace 11 has a longitudinal direction X and a short direction Y in plan view. The side wall 12 is configured by arranging a plurality of refractories R along the longitudinal direction X and the transverse direction Y. The glass melting furnace 11 is a so-called tank crucible, and although not shown, the glass melting furnace 11 is provided with a charging unit for charging a glass raw material, a heating mechanism for heating the glass, an outflow unit for flowing the molten glass, and the like.

  As each refractory R which comprises the side wall 12 of the glass melting furnace 11, an electrocast brick is used suitably. Examples of each refractory R include zirconia-based (zirconia-based) electroformed bricks and alumina-based (alumina-based) electroformed bricks. Examples of zirconia-based electroformed bricks include alumina-zirconia-silica-based electroformed bricks and high zirconia-based electroformed bricks. Each refractory R may use 1 type and may use 2 or more types. As each refractory R, it is preferable to use a zirconia-type electrocast brick from a durable viewpoint. The bottom wall 13 of the glass melting furnace 11 can also be configured using a refractory R.

  The glass melting furnace 11 includes a support 14 fixed at a position spaced apart from the side wall 12 at the outside of the side wall 12. The support part 14 is fixed to the structural member S which comprises the structure in which the glass melting furnace 11 is installed, for example. The support 14 is preferably made of metal. Moreover, it is preferable that the support part 14 is equipped with the adjustment mechanism which adjusts a distance with the side wall 12. As such a support part 14, a jack bolt is mentioned, for example.

  As shown in FIGS. 2A and 2B, the glass melting furnace 11 includes an intermediate portion 15 sandwiched between the refractory R forming the side wall 12 and the support portion 14. In other words, the support portion 14 supports the refractory R via the intermediate portion 15. The side wall of the glass melting furnace 11 is erected in the Z-axis direction orthogonal to the longitudinal direction X and the short direction Y described above.

  The intermediate portion 15 includes a buffer member 16 having a configuration that is broken or deformed in preference to the refractory R by being compressed by the expansion (thermal expansion) of the refractory R constituting the side wall 12 . The cushioning member 16 has a configuration in which it is broken or deformed in preference to the support portion 14. The intermediate portion 15 of the present embodiment is constituted only by the buffer member 16. That is, the buffer member 16 is in contact with both the side wall 12 and the support portion 14. The buffer member 16 also has a recess 16 a, and the opening of the recess 16 a is disposed at a position facing the side wall 12.

  The buffer member 16 of the present embodiment is made of brick. The compressive strength of the buffer member 16 is preferably, for example, 50 MPa or less. The porosity of the buffer member 16 is preferably, for example, 5% or more. The bulk specific gravity of the buffer member 16 is preferably, for example, 3 or less. The compressive strength, the porosity, and the bulk specific gravity of the buffer member 16 can be measured in accordance with JIS R2205. The cushioning member 16 is preferably, for example, a chamotte-based (chamotte) brick.

  The glass melting furnace 11 of this embodiment is provided with the support part 14 and the intermediate part 15 in each position which becomes each end side of the side wall 12 of the longitudinal direction X. As shown in FIG. That is, the buffer members 16 are disposed at respective positions on both ends of the side wall 12 in the longitudinal direction X.

  The buffer member 16 of the glass melting furnace 11 of this embodiment is arrange | positioned corresponding to each of several refractory R. As shown in FIG. For example, when the dimensions of the refractory R constituting the side wall 12 are relatively large, the plurality of buffer members 16 may be disposed corresponding to one refractory R. When arranging a plurality of shock absorbing members 16 for one refractory R, the plurality of shock absorbing members 16 are preferably spaced apart in the extending direction of the side wall 12 in a plan view of the side wall 12.

  In addition, as shown in FIG.2 (b), the support part 14 may be the support part 14 provided with the base 14a and the support plate 14b provided in the base 14a. The intermediate portion 15 between the support 14 and the side wall 12 may include a plurality of buffer members 16.

The above glass melting furnace 11 can be used for manufacture of glass articles, such as plate glass, glass fiber, tube glass, for example.
Next, the main operation of the glass melting furnace 11 will be described.

  For example, before installing the glass melting furnace 11 and introducing the raw material of glass into the glass melting furnace 11, the temperature of the glass melting furnace 11 is raised to a temperature suitable for melting the raw material of glass. Further, for example, while the glass melting furnace 11 is in operation, the temperature of the molten glass G indicated by the two-dot chain line in FIGS. 2A and 2B may be increased. Thus, when raising the temperature of the glass melting furnace 11, the side wall 12 and the like of the glass melting furnace 11 expand.

  The glass melting furnace 11 includes an intermediate portion 15 sandwiched between the side wall 12 and the support portion 14. The intermediate portion 15 includes a buffer member 16, and the buffer member 16 is compressed by the expansion of the refractory R constituting the side wall 12 to have a configuration that is broken or deformed in preference to the refractory R. doing. According to this configuration, when the refractory R constituting the side wall 12 of the glass melting furnace 11 expands, the buffer member 16 is broken or deformed, thereby releasing the excess thermal stress generated in the refractory R. .

  Also, the over-expanded refractory R is easily identified by visually observing the breakage or deformation of the cushioning member 16. By placing a new buffer member 16 with different dimensions in the intermediate portion 15 between the refractory R and the support 14 specified in this way or adjusting the position of the support 14, the refractory R can be obtained. It can be properly supported.

  Here, in the side wall 12 of the glass melting furnace 11, the portion in contact with the buffer member 16 is more difficult to dissipate heat than the other portions, and the temperature may be higher than the other portions. In this respect, since the buffer member 16 of the present embodiment has the opening of the recess 16 a at a position facing the side wall 12, the contact area between the side wall 12 and the buffer member 16 can be suppressed. Thereby, for example, it is possible to reduce temperature variation in the outer surface of the side wall 12.

According to the embodiment described above in detail, the following effects are exhibited.
(1) The glass melting furnace 11 is provided with a side wall 12 configured using a refractory R. The glass melting furnace 11 includes a support portion 14 fixed at a position spaced apart from the side wall 12 outside the side wall 12 and an intermediate portion 15 held between the side wall 12 and the support portion 14. The middle portion 15 includes the buffer member 16 having a configuration in which the intermediate portion 15 is compressed by the expansion of the refractory R constituting the side wall 12 so that the intermediate portion 15 is broken or deformed in preference to the refractory R. According to this configuration, as described above, since the excessive thermal stress generated in the refractory R is released, the refractory R constituting the side wall 12 can be easily protected.

  Also, the over-expanded refractory R is easily identified by visually observing the breakage or deformation of the cushioning member 16. By placing a new buffer member 16 with different dimensions in the intermediate portion 15 between the refractory R and the support 14 specified in this way or adjusting the position of the support 14, the refractory R can be obtained. It can be properly supported.

  When the refractory R constituting the side wall 12 is directly supported by the support portion 14 as in the prior art, the support portion 14 is easily deformed due to the expansion of the refractory R. The support portion 14 once deformed in this manner needs to be replaced because the function of supporting the refractory R is reduced. Such replacement of the support portion 14 results in, for example, an increase in equipment cost. According to the above configuration, since the support 14 is protected by the breakage or deformation of the buffer member 16, the frequency of replacement of the support 14 can be reduced. This makes it possible to reduce the equipment cost.

  (2) The glass melting furnace 11 is equipped with the buffer member 16 which has the recessed part 16a. The buffer member 16 having the recess 16 a has lower compressive strength than the buffer member 16 in which the recess 16 a is omitted. Therefore, the shock absorbing member 16 having the recess 16 a is suitable as the shock absorbing member 16 which is broken or deformed in preference to the refractory R constituting the side wall 12.

  (3) The glass melting furnace 11 includes the buffer member 16 in contact with the side wall 12 and having a recess 16 a at a position facing the side wall 12. In this case, since it is possible to reduce the temperature variation on the outer surface of the side wall 12, it is possible to suppress the breakage of the refractory R caused by the temperature variation.

  (4) The side wall 12 of the glass melting furnace 11 has the longitudinal direction X in plan view. The glass melting furnace 11 is provided with a support portion 14 and an intermediate portion 15 at each position on both sides in the longitudinal direction X of the side wall 12. In this case, since the side wall 12 in the longitudinal direction X is supported by the support portion 14 from both end sides, generation of a gap between the plurality of refractories R can be suppressed. However, since the expansion in the side wall 12 in the longitudinal direction X is larger than the side wall 12 in the lateral direction Y, the thermal stress in the side wall 12 in the longitudinal direction X tends to be large. In such a glass melting furnace 11, the thermal stress of the refractory R constituting the side wall 12 in the longitudinal direction X by providing the intermediate portion 15 having the buffer member 16 at each position on both ends of the side wall 12 in the longitudinal direction X. Can be suitably opened. Therefore, it is possible to suppress the occurrence of a gap in the side wall 12 in the longitudinal direction X, and to easily protect the side wall 12.

  (5) In the glass melting furnace 11, the buffer member 16 is arrange | positioned corresponding to each of several refractory R. As shown in FIG. In this case, thermal stress generated in the plurality of refractories R can be released. Therefore, the refractory R constituting the entire side wall 12 can be easily protected.

  (6) In the glass melting furnace 11, it is preferable that the plurality of refractories R include zirconia-based electroformed bricks, and the buffer members 16 disposed corresponding to the zirconia-based electroformed bricks be chamotte-based bricks.

  Although the above-mentioned zirconia-based electroformed brick is excellent in durability, it tends to expand relatively larger than, for example, alumina-based electroformed brick in a predetermined temperature range. On the other hand, chamotte bricks have relatively low compressive strength. For this reason, when the durability of the side wall 12 is enhanced by the zirconia-based electroformed brick, using the chamotte-based brick as the buffer member 16 is advantageous as a structure for suitably releasing the thermal stress of the zirconia-based electroformed brick is there. In addition, since the chamotte brick is relatively inexpensive, the equipment cost can be reduced.

  (7) According to the method for raising the temperature of the glass melting furnace 11 using the glass melting furnace 11, the excess thermal stress generated in the refractory R constituting the side wall 12 is released during the temperature rising of the glass melting furnace 11. be able to. Thereby, refractory R which comprises the side wall 12 of the glass melting furnace 11 in temperature rising can be protected easily. Therefore, since the cost accompanying replacement | exchange of the refractory R can be held down, it becomes possible to hold down equipment cost.

  (8) According to the method of manufacturing a glass article using the glass melting furnace 11, excessive heat generated in the refractory R constituting the side wall 12 when raising the temperature of the glass melting furnace 11 during production of the glass article It can release stress. Thereby, during manufacture of a glass article, refractory R which constitutes side wall 12 of glass melting furnace 11 can be protected easily. Therefore, since the time and effort of repair of the side wall 12 can be reduced, it becomes possible to raise the productivity of a glass article.

(Modification example)
The above embodiment may be modified as follows.
The buffer member 16 of the glass melting furnace 11 has the recess 16a having an arc shape in cross section, but as shown in FIGS. 3 (a) and 3 (b), the cross section of the recess 16a may It can also be changed to a V-shape or a U-shape.

  -As shown in FIG.3 (c), you may change into the buffer member 16 which has an opening of the recessed part 16a in the position which does not oppose the side wall 12 of the glass melting furnace 11. As shown in FIG. Further, for example, as shown in FIG. 3D, the recess 16a in the buffer member 16 of the glass melting furnace 11 may be changed to the through hole 16b, or a buffer member having both the recess 16a and the through hole 16b. It may be changed to 16. Thus, the buffer member 16 of the glass melting furnace 11 can obtain the effects described in section (2) above by including the buffer member having at least one of the recess and the through hole. Further, the buffer member 16 of the glass melting furnace 11 is in contact with the side wall 12 and includes the buffer member having at least one of the opening of the recess 16 a and the opening of the through hole at a position facing the side wall 12. 3) The effects described in the section 3) can be obtained. In this case, recesses of different shapes and through holes of different shapes can be combined.

  -As shown in FIG.3 (e), the buffer member 16 of the glass melting furnace 11 may be divided | segmented into several buffer members 16, 16, and you may arrange | position along an up-down direction. Even in this case, it is possible to lower the compressive strength of the shock absorbing member 16, but from the viewpoint of reducing the number of parts of the shock absorbing member 16 and facilitating the attachment of the shock absorbing member 16, the recess or the through hole It is preferable to use a buffer member 16 having at least one of the following.

  -As shown in FIG.3 (f), the intermediate part 15 of the glass melting furnace 11 may be equipped with intermediate members 17 other than the buffer member 16. As shown in FIG. For example, the intermediate member 17 may be further provided between the side wall 12 of the glass melting furnace 11 and the buffer member 16 so that the side wall 12 does not contact the buffer member 16.

-As shown in Drawing 3 (e) and Drawing 3 (g), crevice 16a in buffer member 16 of glass melting furnace 11 may be omitted.
The shape of the recess 16a in the buffer member 16 of the glass melting furnace 11 extends from one end to the other end of the contact surface contacting the support portion 14, but is not limited thereto. For example, the recess 16 a of the cushioning member 16 can be formed at a position surrounded by the contact surface that contacts the support portion 14. Moreover, although the recessed part 16a of the buffer member 16 is extended in the horizontal direction, it is not limited to this, For example, it can also be changed into the recessed part 16a extended in the perpendicular direction. The recess 16a in the buffer member 16 of the glass melting furnace 11 preferably extends from one end to the other end of the contact portion contacting the side wall 12, that is, the contact surface is divided into a plurality of places. In this case, the heat between the side wall 12 and the buffer member 16 can be suitably dissipated, so that the temperature variation on the outer surface of the side wall 12 can be suitably suppressed.

A plurality of buffer members 16 may be stacked along the thickness direction of the side wall 12.
A plurality of buffer members 16 having different compositions may be used in combination as the buffer member 16 of the glass melting furnace 11. Moreover, the buffer member 16 of the glass melting furnace 11 is not limited to a brick, For example, you may change into the buffer member 16 comprised from refractory mortar. Alternatively, a composite of a refractory mortar and a filler such as fire resistant fiber may be used as the buffer member 16.

The buffer member 16 of the glass melting furnace 11 can also be disposed so as to straddle adjacent refractories R on the side wall 12.
-In the side wall 12 of the glass melting furnace 11, the support part 14 and the intermediate part 15 which become each end side in the longitudinal direction X can also be abbreviate | omitted.

The plan view shape of the glass melting furnace 11 is not limited to the illustrated rectangular shape, and may be changed to any shape such as a square or a trapezoid.
The side wall 12 of the glass melting furnace 11 may include the refractory R supported by the supporting portion in contact with the side wall 12 while omitting the intermediate portion 15.

-The said support part 14 of the glass melting furnace 11 may be abbreviate | omitted, and you may use component member S itself as the support part 14 of the glass melting furnace 11 together.
The glass melting furnace 11 should be changed to a glass melting furnace 11 into which the molten glass G flows in and a glass melting furnace 11 aiming to clarify the molten glass flowing into, in addition to the purpose of melting the glass raw material. You can also.

  DESCRIPTION OF SYMBOLS 11 ... Glass melting furnace, 12 ... Side wall, 14 ... Support part, 15 ... Intermediate part, 16 ... Buffer member, 16a ... Concave part, 16b ... Through-hole, R ... Refractory thing.

Claims (8)

What is claimed is: 1. A glass melting furnace comprising a side wall constructed using a plurality of refractories, comprising:
A support fixed at a position spaced apart from the side wall on the outside of the side wall;
An intermediate portion held between the side wall and the support portion and in contact with a part of the side wall ;
The said intermediate part is a glass melting furnace provided with the buffer member which has a structure by which it is compressed by expansion | swelling of the said refractory, and is destroyed or deformed preferentially over the said refractory.   The said buffer member has a recessed part and at least one of a through-hole, The glass melting furnace of Claim 1 characterized by the above-mentioned.   The glass melting furnace according to claim 2, wherein the buffer member is in contact with the side wall and has at least one of an opening of the recess and an opening of the through hole at a position facing the side wall.   The said side wall has a longitudinal direction in planar view, The said support part and the said intermediate part are provided in each position which becomes the both end side of the side wall of the said longitudinal direction, The any one of the Claims 1 to 3 characterized by The glass melting furnace according to any one of the preceding claims.   The said buffer member is arrange | positioned corresponding to each of these refractory, The glass melting furnace as described in any one of the Claims 1-4 characterized by the above-mentioned. The plurality of refractories include zirconia-based electroformed bricks,
The said buffer member arrange | positioned corresponding to the said zirconia-type electrocast brick is a chamotte-type brick, The glass melting furnace as described in any one of the Claims 1-5 characterized by the above-mentioned.   The temperature rising method of a glass melting furnace characterized by heating up the glass melting furnace as described in any one of Claims 1-6.   A method for producing a glass article, comprising producing a glass article using the glass melting furnace according to any one of claims 1 to 6.