KR20210122696A - Glass melting furnace, apparatus for producing glass and method for producing glass - Google Patents

Abstract

The present invention relates to a glass melting furnace, a glass manufacturing apparatus, and a glass manufacturing method. The glass melting furnace having a crown structure is provided with a refractory layer (25) and a heat-resistant layer (29). The refractory layer (25) has a block row in which a plurality of refractory blocks (23) are arranged in an arch shape, and the heat-resistant layer (29) is arranged above the refractory layer (25) and has heat-resistant blocks (27) with larger porosity than the refractory blocks (23). The refractory layer (25) has: a plurality of block segments in which a plurality of block rows are connected in the longitudinal direction of the glass melting furnace; and a gap portion (S) disposed between the plurality of block segments and absorbing thermal expansion in the longitudinal direction of the refractory blocks (23). The crown structure is provided with a first heat insulation component (51) which surrounds the upper opening of the gap portion (S) and defines a first space (45) on the inner side. The first heat-insulation component (51) is formed of a refractory material having a porosity of 50% or less.

Description

Glass melting furnace, glass manufacturing apparatus and glass manufacturing method

The present invention relates to a glass melting furnace, a glass manufacturing apparatus and a glass manufacturing method.

In a glass melting furnace, the inside of the furnace becomes very high temperature to melt glass, and its furnace walls, ceiling, etc. are made of refractory bricks resistant to the furnace temperature on the inner side, and the heat in the furnace is provided by providing a heat-resistant block on the outside. is not released to the outside.

And when the furnace temperature becomes high about 1650 degreeC by specialization of the glass to melt, the crown structure which has a vault-shaped arch using electric pole brick block as a fireproof block is proposed (patent document) see 1).

According to Patent Document 1, when volatile gas (gas in the furnace) derived from glass leaks out of the furnace through the joints between the fire blocks, the heat resistant block disposed on the upper layer of the fire block is eroded, and the amount of heat dissipated from the crown structure is increased. becomes a problem Then, the structure (gas leakage barrier layer) which has a dense irregular refractory body provided so that the joint between fireproof blocks may be covered and blocks|blocks a gas leak is proposed.

International Publication No. 2013/179409

However, in addition to reacting with the volatile gas leaking from the joint between fire blocks, the said dense irregular refractory material reacts with the glassy substance which oozes out from a fire block, and a fire block and a dense irregular refractory material adhere. Therefore, even if a dense amorphous refractory material and a heat-resistant block eroded in the joint between fire-resistant blocks and its surroundings, these may not be replaceable.

If the dense irregular refractory material and heat-resistant block are not disposed, the amount of heat dissipated from the crown structure increases, resulting in an increase in energy loss.

In addition, the fire resistant block constituting the crown structure expands at the time of thermal rise in the stage before starting the manufacture of glass. About the long side direction of a glass melting furnace, the expansion|swelling of a fireproof block is relieved by the gap part provided previously between block segments. However, since the clearance gap is larger than the joint between fireproof blocks, the amount of heat dissipation is large. Then, when a dense amorphous refractory material etc. are arrange|positioned so that a gap|interval part may be covered, since said sticking will generate|occur|produce remarkably, even if a dense irregular shape refractory material etc. eroded, these may not be replaced.

The present invention has been made in view of the above problems, and in and around the joints or gaps, a heat shield member formed of a dense amorphous refractory material, etc., a heat resistant block, etc. can be disposed interchangeably, and from the crown structure An object of the present invention is to provide a glass melting furnace, a glass manufacturing apparatus, and a glass manufacturing method capable of reducing the amount of heat dissipation.

The present invention includes the following configurations.

(1) A crown structure glass comprising: a fire resistant layer having a block row in which a plurality of fire resistant blocks are arranged in an arcuate shape; It is a melting furnace,

The fire resistant layer absorbs thermal expansion in the long side direction of the fire resistant block between a plurality of block segments in which the plurality of block rows extend along the long side direction of the glass melting furnace, and between the plurality of block segments. have a gap,

The crown structure includes a first heat shield member surrounding the upper opening of the gap portion and defining a first space therein,

The said 1st heat-shielding member is formed with the refractory material of 50% or less of porosity, The glass melting furnace characterized by the above-mentioned.

(2) It is a glass manufacturing apparatus provided with a melting furnace, a shaping|molding furnace, and a slow cooling furnace,

The said melting furnace is a glass manufacturing apparatus which is the glass melting furnace as described in (1).

(3) a glass manufacturing method including a melting process, a forming process, and an annealing process in this order,

The said melting process WHEREIN: The glass manufacturing method using the glass melting furnace of (1).

ADVANTAGE OF THE INVENTION According to this invention, a heat shield member, a heat-resistant block, etc. can be arrange|positioned interchangeably in a joint or a gap part and its periphery, and the amount of heat dissipation from a crown structure can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing of the glass melting furnace which concerns on one Embodiment of this invention.
FIG. 2 : is the schematic sectional drawing which looked at the glass melting furnace shown in FIG. 1 from the side.
3 : is a schematic schematic regular view which looked at the fireproof layer from upper direction.
Fig. 4 is a partially enlarged cross-sectional view of an arrangement portion of a gap portion of the ceiling member shown in Fig. 2 .
5 is a partially enlarged cross-sectional view of a joint portion showing an example of the second heat shield member.
6 is a partially enlarged cross-sectional view of a joint portion showing an example of the second heat shield member and the heat shield plate.
7 : is a flowchart which shows the procedure of a glass manufacturing method.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail with reference to drawings.

<Structure of Glass Melting Furnace>

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing of the glass melting furnace which concerns on one Embodiment of this invention. FIG. 2 : is the schematic sectional drawing which looked at the glass melting furnace shown in FIG. 1 from the side. FIG. 2 corresponds to a cross-sectional view taken along line II-II in FIG. 1 . In addition, FIG. 1 corresponds to the cross-sectional view taken along line II-I of FIG.

As shown in FIG. 1, the glass melting furnace 100 of this embodiment is equipped with the melting tank 11 to which glass-making feedstock is supplied inside, and the upper structure 13 which covers the upper direction of the melting tank 11. As shown in FIG. In addition, although not shown, a burner for heating is provided in the upper structure 13 , and an energizing electrode is provided in the dissolution tank 11 . Although this dissolution tank 11 is supported by the appropriate support structure provided outside the, a support form is not limited to this.

The dissolution tank 11 and the upper structure 13 have a shape extending in the X direction. 1 shows a cross-sectional view of a plane perpendicular to the X direction, the X direction corresponds to the long side direction of the dissolution tank 11 , and the Y direction corresponds to the short side direction of the dissolution tank 11 . The Z direction of FIG. 1 corresponds to the vertical direction of the glass melting furnace 100 .

The glass melting furnace 100 is supplied to the inside of the melting tank 11 by combustion of a burner (not shown) of the upper structure 13 and application of a voltage to an energized electrode (not shown) of the melting tank 11 . dissolved glass raw material. The melting tank 11 is provided with the bottom part 15 and the side wall part 17, and holds the molten glass G obtained by melt|dissolving. Moreover, as shown in FIG. 2, the glass discharge path 35 which discharges|discharges the molten glass G hold|maintained inside the melting tank 11 is provided in the X direction downstream of the glass melting furnace 100. As shown in FIG.

The upper structure 13 is provided with the transverse wall member 19 which stands upward from the side wall part 17 of the dissolution tank 11, and the ceiling member 21 arrange|positioned above the transverse wall member 19. As shown in FIG. As shown in Fig. 1, the lateral wall member 19 extends vertically, and the ceiling member 21 has a bolt-shaped arch. Here, the bolt shape is a shape formed by extending in the horizontal direction (X direction) the arc shape in which the central part becomes convex in the upward direction. In this specification, the direction in which the arch (circular arc) in this bolt shape is formed is called the circumferential direction, and the direction in which the arc shape is extended in the horizontal direction is also called a long side direction (X direction).

The ceiling member 21 (crown structure) is arrange|positioned above the fire-resistant layer 25 which has a block row|line|column in which the some fire-resistant block 23 was arrange|positioned in the arc shape, and the fire-resistant layer 25, and the fire-resistant block 23 ) and a heat-resistant layer 29 having a heat-resistant block 27 having a larger porosity than .

As shown in FIG. 2 , the fire resistant layer 25 includes a plurality of block segments SEG1 , SEG2 , SEG3 , SEG4 in which a plurality of block rows continue along the long side direction (X direction) of the glass melting furnace 100 and , it has the gap|interval S which absorbs the thermal expansion in the long side direction (X direction) of the fireproof block 23 between some block segment SEG1, SEG2, SEG3, SEG4 comrades.

The crown structure includes a first heat shielding member 51 that surrounds the upper opening 41 (refer to FIG. 4 ) of the gap portion S and defines a first space 45 therein. The first heat shielding member 51 is made of a refractory material having a porosity of 50% or less.

The crown structure includes, between the fire resistant layer 25 and the heat resistant layer 29, a heat shield member 59 for joints provided to cover the joints between the fire blocks 23, and the heat shield members 59 for joints have a porosity of 50. % or less of the refractory material is preferably formed. Thereby, while preventing the leakage of volatile gas from the joint 57 between the fireproof blocks 23, since the heat insulation effect becomes high, the effect that the amount of heat radiation from a crown structure decreases is exhibited.

In addition, the crown structure encloses the upper portion of the joint 57 between the fire resistant blocks 23 between the fire resistant layer 25 and the heat resistant layer 29 and forms a second space 61 (refer to FIG. 5 ) on the inside. A second heat shield member 62 may be provided. The second heat shield member 62 is preferably formed of a refractory material having a porosity of 50% or less. Thereby, in addition to the said effect, it can suppress that the heat|fever from the joint 57 diffuses and the heat shield layer 31 is heated strongly locally.

The upper surface of the heat-resistant layer 29 is covered with the heat-retaining member 33 .

Since the fire resistant layer 25 is bolt-shaped, it is independent by gravity and is integrally constituted, and a plurality of fire resistant blocks 23 are arranged in an arcuate shape along the circumferential direction, in a plurality of rows along the long side direction. have it A block sequence is integrated as one block segment for every predetermined number of columns.

<fireproof layer>

3 : is a schematic schematic top view which looked at the fireproof layer 25 from upper direction.

In FIG. 3, four block segments SEG1, SEG2, SEG3, SEG4 are shown in which the block row in which the 12 fire-resistant blocks 23 were arrange|positioned in the circumferential direction were arranged in three rows in the long side direction.

Each fire resistant block 23 in the block segment is arranged in a state where there is no gap between each other. That is, the fire resistant block 23 is formed in a shape such that the contact portions between the blocks are smooth and adjacent blocks correspond to each other so that the gap between the blocks is not greatly opened. Between the block segments along the long side direction, the clearance gap S of the space|interval ΔL is provided.

The gap portion S between the block segments functions as a concentrated expansion portion for absorbing the thermal expansion in the long side direction of the fire resistant block 23 at the time of thermal rise in the stage before starting the manufacture of glass. Specifically, the gap portion S is emptied at a predetermined gap before the start of thermal rise of the glass melting furnace 100, and is narrowed by thermal expansion of the refractory block 23 at the time of thermal rise. S) is not completely blocked, and the interval becomes ΔL. The space|interval of the clearance gap part S is 10 mm or more and 50 mm or less before the start of thermal rise, and more than 0 mm and 20 mm or less after completion of a thermal rise, for example.

The fire resistant block 23 has fire resistance and corrosion resistance to free vapors (volatile gases). The refractory block 23 is preferably an electric pole brick block of at least one refractory material selected from the group consisting of alumina, zirconia, alumina/zirconia, and alumina/zirconia/silica. A refractory block of a refractory material such as siliceous material or mullite material may be used. Further, in the present specification as a means including mainly siliceous it is SiO _2, and the like used in the sense of true mullite quality. Here, the main component means that the component content ( _{the sum of Al 2} O ₃ , ZrO ₂ and SiO _{2 in} the case of alumina/zirconia/silica) is 50 mass% or more.

The fireproof block 23 used here can be suitably selected according to the operating conditions of the glass melting furnace 100. As shown in FIG. For example, in the case of an oxygen combustion type glass melting furnace using oxygen gas or a gas with increased oxygen concentration as the burner's retardant gas, an electric pole brick block with high fire resistance temperature and high corrosion resistance is preferable, and in particular, an alumina-zirconia electric pole Brick blocks are preferred.

Compared with a fired brick block, an electric pole brick block has high corrosion resistance with respect to the molten glass G melt|dissolved at high temperature, and has the outstanding characteristic that molten glass G is hard to contaminate. Moreover, the electric pole brick block also has the characteristic that a specific resistance is low compared with a fired brick block.

As the electric pole brick block, an AZS system electric pole brick, a zirconia system electric pole brick, or an alumina system electric pole brick is mentioned.

<heat shielding layer>

As shown in FIGS. 1 and 2 , the heat shield layer 31 including the first heat shield member 51 (refer to FIG. 2 ) is formed between the fire resistant layer 25 and the heat resistant layer 29 . desirable. The heat shield layer 31 further includes heat shield blocks 30 and 60 and a heat shield member 59 for joints.

The heat shield block 30 is disposed on the fire resistant layer 25 . The heat shield member 59 for joints is provided on the outer surface of the fire resistant layer 25 , covers the joints 57 between the fire blocks 23 , and prevents the volatile gas from leaking from the joints 57 . The heat blocking block 60 is disposed on the heat blocking member 59 for joints. It is preferable that the heat shield blocks 30 and 60 are formed of a heat insulating irregular refractory material. In addition, it is preferable that the heat shield member 59 for joints is formed of a dense amorphous refractory material.

In addition, the heat shield layer 31 may apply|coat and form a dense irregular refractory material or heat insulation irregular refractory material so that the outer surface of the fireproof block 23 and the 1st heat shield member 51 may be covered.

In either case, the heat shield layer 31 is integrally and airtightly formed on the outer surface of the fire resistant layer 25 . Thereby, even if the upward protrusion by expansion|swelling of the fire-resistant block 23 generate|occur|produces, the clearance gap between the fire-resistant blocks 23 does not become largely empty. In this way, the heat shielding layer 31 effectively prevents gas leakage, and prevents heat or volatilization gas from leaking to the outside.

The heat shield member 59 for joints formed of a dense irregular refractory material builds a dense structure on the fire block 23 and reliably prevents gas leakage. It is preferable that the bulk specific gravity is 3.0 or more at 110 degreeC, and, as for a dense amorphous refractory body, 3.1 or more are more preferable.

As the quality monolithic refractory dense and strong components in the reaction with a volatile gas Preferably, in that case quality alumina, and the Al ₂ O ₃ as a refractory material containing more preferably at least 90 mass% to 85 mass% of the refractory. As a dense amorphous refractory material, the high alumina self-flow castable material (model number RF-SRC1) etc. made from AGC Ceramics Co., Ltd. are mentioned, for example.

It is preferable that the bulk specific gravity in 110 degreeC is 1.2 or less, and, as for a heat insulation irregular refractory material, 1.1 or less are more preferable. Moreover, it is preferable that the thermal conductivity in 1000 degreeC is 0.7 W/(m*K) or less, and, as for a heat insulation amorphous refractory material, 0.6 W/(m*K) or less is more preferable.

Alumina, zirconia, alumina/zirconia, alumina/zirconia/silica, etc. can be used as the heat-insulating irregular refractory material, but alumina/zirconia is preferable in terms of heat resistance and corrosion resistance to glass. When alumina and zirconia as the quality and the content of Al ₂ O ₃ ZrO ₂ the sum of more than 80% by mass is preferable, and preferably at least 85% by weight than that. As an adiabatic irregularity refractory body, Thermotect Wall (trademark) (AGC Ceramics Co., Ltd. model number TMT1600) etc. are mentioned, for example.

<Heat-resistant layer>

The heat-resistant layer 29 has a plurality of heat-resistant blocks 27 , 28 , and includes a part of the first heat-shielding member 51 (heat-shielding plate 49 ). The heat resistant block 27 is disposed on the heat shield layer 31 . The heat resistant block 28 is preferably disposed on the first heat shielding member 51 . In addition, the heat-resistant layer 29 does not need to include a part of the 1st heat-shielding member 51 (heat-shielding plate 49). In this case, the heat shield plate 49 is included in the heat shield layer 31 .

The heat-resistant blocks 27 and 28 increase the thermal insulation effect of the crown structure, making it difficult to relieve heat in the furnace to the outside. The heat-resistant blocks 27 and 28 are preferably formed of an alumina-zirconia refractory material. This refractory material is lighter than the refractory material of the fire block 23, a bulk specific gravity is small, and is a low thermal conductivity material. Thereby, the heat insulation effect can be improved, suppressing the increase in the weight of the ceiling member 21 itself.

The heat-resistant blocks 27 and 28 preferably have a bulk specific gravity of 1.2 or less at 110°C and a thermal conductivity of 0.7 W/(m·K) or less at 1000°C. Thereby, the crown structure excellent in light weight and heat insulation can be provided.

The heat-resistant blocks 27 and 28 are preferably formed of an irregular refractory material, and are formed (precast) and dried in a block shape in advance, and placed on the fire-resistant block 23 or the first heat shielding member 51, may be fixed. Moreover, on the fireproof block 23 or the 1st heat shield member 51, you may form so that an irregular refractory material etc. may become a desired shape at a desired position by spraying, inflowing, troweling, stamping, etc. The heat-resistant blocks 27 and 28 can be formed by, for example, Thermotect Wall (registered trademark) (Model No. TMT1600, manufactured by AGC Ceramics Co., Ltd.). In addition, since the heat-resistant block 27 disposed on the heat-blocking blocks 30 and 60 can reduce the amount of heat dissipated from the crown structure by the heat-blocking blocks 30 and 60, it may be a cheaper type A fire-insulating brick or the like. .

<No thermal insulation>

The insulating member 33 is preferably a fiber fabric or a solid board containing inorganic fibers. The heat insulating member 33 is exchangeably disposed on the heat resistant blocks 27 and 28 . The inorganic fibers _{preferably include artificial mineral fibers including SiO 2} , MgO and CaO, or ceramic fibers. By constituting the heat insulating member 33 from a textile fabric, the degree of freedom in arrangement and shape freedom of the heat insulating member 33 can be increased. In addition, these inorganic fibers have excellent heat resistance that hardly receives thermal damage even when the temperature of the portion in contact with the heat-resistant blocks 27 and 28 reaches a high temperature of 900°C to 1300°C. The thickness of the insulating member 33 is 10 mm to 100 mm, preferably 30 mm to 70 mm, more preferably 40 mm to 60 mm.

When molten glass G is glass (for example, soda-lime glass) containing an alkali metal, a Na component is contained in the volatilization gas from the inside of a furnace. Moreover, even if it is alkali free glass which molten glass G does not contain an alkali metal substantially, when the fireproof block 23 contains the refractory body containing a Na component, the Na component contained in the fireproof block 23 volatilizes. By doing so, Na component is contained in the volatilization gas from the inside of a furnace.

When the Na component of the volatile gas condenses in the heat shield layer 31 , the heat shield layer 31 and the Na component react to lower the melting point of the heat shield layer 31 . For this reason, when the heat shield layer 31 is exposed to volatile gas, it will melt away, and will speed up the exchange cycle of the heat shield layer 31. As shown in FIG. This also applies to the heat-resistant blocks 27 and 28, and the replacement cycle of the heat-resistant blocks 27 and 28 is accelerated due to dissolution loss.

Then, it is preferable that the temperature of the part which contact|connects the heat-resistant blocks 27 and 28 of the heat-retaining member 33 is 900 degreeC or more. It is because the temperature at which the Na component of volatile gas aggregates is about 800-950 degreeC, and it becomes difficult to generate|occur|produce aggregation at the temperature of 900 degreeC or more. In addition, the temperature of the part in contact with the heat-resistant blocks 27 and 28 is the temperature measured using the thermocouple.

Therefore, it is preferable that the upper surfaces of the heat-resistant blocks 27 and 28 are covered with the heat retention member 33 . According to this structure, it becomes difficult to generate|occur|produce the aggregation of the Na component of volatile gas in the heat-resistant blocks 27 and 28, and damage to the heat-resistant blocks 27 and 28 can be suppressed.

On the other hand, since the aggregation of the Na component of volatilization gas generate|occur|produces, it is preferable to replace the heat retention member 33 according to the aggregation state or regularly. Since the heat insulating member 33 is a member disposed on the outermost side of the ceiling member 21, the replacement operation is completed with a simple operation without disassembling the furnace body.

In addition, as the heat retention member 33, the solid board containing an inorganic fiber can also be used as mentioned above. As a solid board, boards, such as a Nichias Corporation Fine Flex (trademark) 1300 hard board, etc. are mentioned.

<Specific structure of heat shielding layer between block segments of fireproof block>

4 is a partially enlarged cross-sectional view of an arrangement portion P of the gap portion S of the ceiling member 21 shown in FIG. 2 .

In the fireproof layer 25, the clearance gap S is provided between the fireproof block 23 of block segment SEG1, and the fireproof block 23 of block segment SEG2.

In the heat shield layer 31 disposed above the fire resistant layer 25 , the first space 45 surrounding the upper opening 41 is provided at the position of the upper opening 41 of the gap portion S. The first space 45 has a rectangular cross section having a length L in the X direction (long side direction) and a height H in the Z direction, and has a space continuous in the Y direction. The first space 45 includes a pair of heat shield walls 47A and 47B disposed at a position spaced apart from the upper opening 41 by about L/2 and a heat-resistant layer 29 facing the upper opening 41 . It is partitioned by the heat shielding plate 49 provided in and the upper surface of the fireproof block 23. As shown in FIG. The first heat shielding member 51 composed of a pair of heat shielding walls 47A and 47B and a heat shielding plate 49 traps in the first space 45 heat or volatilization gas emitted from the gap portion S in the furnace. .

The first heat shielding member 51 is formed of a refractory material having a porosity of 50% or less. Thereby, the heat insulating effect of the crown structure can be enhanced while securing the strength of the first heat shielding member 51 . The porosity of the first heat shield member 51 is preferably 40% or less, more preferably 30% or less, and more preferably 20% or less. In addition, the porosity and bulk specific gravity in this specification were measured according to "the measuring method of the apparent porosity, water absorption, and specific gravity of a fire brick" of JIS R2205:1992.

The first heat shielding member 51 is preferably made of at least one refractory material selected from the group consisting of alumina, zirconia, alumina/zirconia, and alumina/zirconia/silica. Thereby, heat resistance and corrosion resistance with respect to volatile gas can be improved. As a refractory material, the high alumina self-flow castable material (model number RF-SRC1) etc. made by AGC Ceramics Co., Ltd. are mentioned, for example.

In addition, the first heat shield member 51 is a bulk specific gravity of 3.0 or more in 110 ℃, preferably an alumina refractory query containing Al ₂ O ₃ less than 85% by weight. Thereby, a dense structure is built, gas leakage is reliably prevented, and corrosion resistance to volatile gas can be improved.

Moreover, it is preferable that the 1st heat shield member 51 is at least one refractory material selected from the group which consists of zircon material, alumina zircon material, silimanite material, spinel material, mullite material, and density zircon material. Thereby, heat resistance and corrosion resistance with respect to volatile gas can be improved.

The first heat-shielding member 51 can be formed by spraying, inflowing, troweling, stamping, etc. of an irregular refractory material, but a member formed in a block shape in advance is placed in a position corresponding to the heat-resistant layer 29 and the heat-shielding layer 31 . It may be in the form of arrangement|positioning.

In addition, the form of the heat shield plate 49 may be the form of a two-layer block in which the upper side contains the refractory material similar to the heat-resistant block 28, and the lower side contains the refractory material of 50% or less of porosity. Thereby, the assembly operation|work and replacement operation|work of the heat shield 49 do not become complicated, and manufacturing cost and maintenance cost can be reduced.

The height H of the first space 45 is preferably 20 mm or more. The height H is more preferably 25 mm or more, still more preferably 30 mm or more. In that case, heat from the gap portion S is diffused in the first space 45 , and the position immediately above the gap portion S in the heat shield plate 49 is not concentrated and heated. As a result, heat is uniformly transferred from the heat shielding plate 49 to the wide range of the heat resistant layer 29 , and a steep temperature rise of the heat resistant layer 29 is suppressed. In addition, as the height H of the first space 45 is higher, the area of the first heat shielding member 51 exposed to the first space 45 can be secured to be large. The incoming heat is exchanged with a large area of the first heat shielding member 51 .

Moreover, it is preferable that ratio H/L of the height H of the 1st space 45 and the length L of the long side direction of 1st space is 0.1-1. Ratio H/L becomes like this. More preferably, it is 0.2 or more, More preferably, it is 0.3 or more. Moreover, ratio H/L becomes like this. More preferably, it is 0.9 or less, More preferably, it is 0.8 or less.

A groove portion 53 wider than the gap portion S is formed in the upper opening 41 of the gap portion S in the longitudinal direction, and a cover member 55 for blocking the upper opening 41 is formed in the groove portion 53 . It is preferable to arrange. The cover member 55 shields heat and volatile gas from the inside of the furnace, and reduces the amount of heat and volatile gas entering the first space 45 through the gap S.

Moreover, it is preferable to provide the heat shield member 59 for joints which covers the joint 57 between the fireproof blocks 23 in the heat shield layer 31, and consists of the same material as the 1st heat shield member 51. As shown in FIG. In that case, it is preferable to arrange|position the heat-shielding block 60 containing the same material as the heat-shielding block 30 on the heat-shielding member 59 for joints. By disposing the heat shield member 59 for joints covering the joints 57 , it is possible to suppress the heat and volatilization gas from entering the heat shield layer 31 intensively at the location of the joints 57 . In addition, the shape of the heat shield member 59 for joints is not limited to the plate shape shown in FIG.

5 is a partially enlarged cross-sectional view of a joint portion showing an example of the second heat shield member. 6 is a partially enlarged cross-sectional view of a joint portion showing an example of the second heat shield member and the heat shield plate. The crown structure may include the second heat shield member 62 of FIGS. 5 and 6 in place of the heat shield member 59 for joints in FIG. 4 .

As shown in FIG. 5, the 2nd heat shield member 62 is arrange|positioned around the upper part of the joint 57 in a cross-sectional door shape, and it is good also as a structure which partitions the 2nd space 61 inside. According to this configuration, heat or volatilization gas from the furnace enters the second space 61 through the joints 57 . Thereby, it can suppress that the heat|fever from the joint 57 diffuses and the heat shield layer 31 is heated strongly locally. Moreover, the momentum of the flow of volatilization gas from the joint 57 is relieved, and inflow into the heat shield layer 31 can be suppressed.

Moreover, as shown in FIG. 6, even if the heat shield plate 63 which consists of the same material as the 2nd heat shield member 62 is arrange|positioned in the 2nd space 61 in the above-mentioned 2nd heat shield member 62, do. When the heat shielding plate 63 covers just above the joint 57 , the heat insulation effect and the shielding effect of the volatile gas can be further improved.

As explained above, according to the glass melting furnace of this embodiment, even if the gap part S for relieving the thermal expansion of the fireproof block 23 is provided, the heat-resistant block 27 by heat radiation from the gap part S, Dissolution loss of the heat shield layer 31 becomes difficult to occur. Therefore, in the glass melting furnace 100, the first heat shielding member 51, the heat resistant blocks 27, 28, the heat insulating member 33, etc. can be easily exchanged without lowering the thermal efficiency, thereby improving maintainability and reducing the cost. It can be done with the planned configuration.

<Glass manufacturing apparatus and glass manufacturing method>

Next, the glass manufacturing apparatus and glass manufacturing method using the glass melting furnace of this embodiment as a melting furnace are demonstrated. 7 : is a flowchart which shows the procedure of a glass manufacturing method.

Glass-making feedstock is supplied in a glass melting furnace, and glass-making feedstock is heated and melt|dissolved by radiating the flame of a burner toward glass-making feedstock (melting process S1). While heating with the flame of a burner, electricity may be applied by applying a voltage to a some electricity supply electrode, and you may heat glass-making feedstock.

The molten glass obtained by melt|dissolving glass-making feedstock is shape|molded with the shaping|molding furnace provided in the downstream rather than a glass melting furnace (forming process S2). The shape|molded glass is annealed in the slow cooling furnace provided on the downstream side from a shaping|molding furnace, and it turns into a glass article (slow cooling process S3).

In order to obtain a glass plate as a glass article, the float method is used, for example. The float method is a method of making the molten glass introduce|transduced on the molten metal (for example, molten tin) accommodated in a float bath into a strip|belt-shaped glass ribbon. A glass ribbon is pulled up from a molten metal, and it cools slowly, conveying in a slow cooling furnace, and turns into plate glass. After the plate glass is taken out from the slow cooling furnace, it is cut into a predetermined dimensional shape by a cutter to obtain a glass plate as a product.

Moreover, in obtaining a glass plate, you may use the fusion method as another shaping|molding method. In the fusion method, the molten glass that has started to overflow from the upper edges of the left and right sides of the gutter member is flowed along the left and right both sides of the gutter member, and joined at the lower edge where the left and right both sides intersect, thereby forming a strip-shaped glass ribbon. am. A molten-glass ribbon is annealed, moving downward in a vertical direction, and becomes plate glass. The plate glass is cut into a predetermined dimensional shape by a cutter to obtain a glass plate as a product.

As described above, the present invention is not limited to the above embodiments, and the present invention also stipulates that each configuration of the embodiments is combined with each other, and that those skilled in the art change and apply based on the description of the specification and well-known techniques. , are included in the scope for which protection is sought.

This application is based on Japanese Patent Application No. 2020-066081 for which it applied on April 1, 2020, The content is taken in here as a reference.

11: dissolution tank
13: superstructure
15: bottom
17: side wall part
19: transverse wall member
21: ceiling member
23: fire block
25: fireproof layer
27, 28: heat-resistant block
29: heat-resistant layer
30, 60: heat block
31: heat shield layer
33: thermal insulation member
41: upper opening
45: first space
47A, 47B: thermal barrier
49: heat shield
51: first heat shield member
53: home
55: cover member
57: joint
59: heat shield member for joints
61: second space
62: second heat shield member
63: heat shield
100: glass melting furnace

Claims (20)

A crown structure glass melting furnace comprising: a fire resistant layer having a block row in which a plurality of fire resistant blocks are arranged in an arcuate shape;
The fire resistant layer absorbs thermal expansion in the long side direction of the fire resistant block between a plurality of block segments in which the plurality of block rows extend along the long side direction of the glass melting furnace, and between the plurality of block segments. have a gap,
The crown structure includes a first heat shield member surrounding the upper opening of the gap portion and defining a first space therein,
The first heat shield member is a glass melting furnace, characterized in that it is formed of a refractory material having a porosity of 50% or less. The glass melting furnace according to claim 1, wherein a heat-shielding layer including the first heat-shielding member is formed between the fire-resistant layer and the heat-resistant layer. The glass melting furnace according to claim 1 or 2, wherein the first heat shield member is at least one refractory material selected from the group consisting of alumina, zirconia, alumina-zirconia, and alumina-zirconia-silica. 3. A method according to claim 1 or 2, wherein the first heat shield member is a bulk specific gravity of the 110 ℃ is 3.0 or more, the alumina refractory quality of a glass melting furnace which contains Al ₂ O ₃ less than 85% by weight. The glass according to claim 1 or 2, wherein the first heat shield member is at least one refractory material selected from the group consisting of zirconium, alumina zirconium, silimanite, spinel, mullite, and denszirconium. melting furnace. The glass melting furnace according to claim 1 or 2, wherein the height of the first space is 20 mm or more. The glass melting furnace of Claim 1 or 2 whose ratio H/L of the height H of the said 1st space and the length L of the said long side direction of the said 1st space is 0.1-1. According to claim 1 or 2, wherein the upper opening of the gap portion is formed with a groove portion wider than the gap portion in the longitudinal direction of the gap portion,
The glass melting furnace in which the cover member which closes the said upper opening is arrange|positioned in the said groove part. The glass melting furnace according to claim 1 or 2, wherein the heat-resistant block is disposed on the first heat shield member. According to claim 1 or 2, wherein the crown structure, between the fire resistant layer and the heat resistant layer, provided with a joint between the fire resistant blocks to cover the joint between the heat shield member for joints,
The said heat shield member for joints is formed with the refractory material of 50% or less of porosity, The glass melting furnace. According to claim 1 or 2, wherein the crown structure, between the fire resistant layer and the heat resistant layer, surrounding the upper portion of the joint between the fire resistant blocks is provided with a second heat shield member defining a second space inside, and ,
The second heat shield member is a glass melting furnace formed of a refractory material having a porosity of 50% or less. The glass melting furnace according to claim 1 or 2, wherein an upper surface of the heat-resistant block is covered with an insulating member. The glass melting furnace according to claim 12, wherein the heat-retaining member is a fiber fabric or a solid board containing inorganic fibers. The glass melting furnace of claim 13 , wherein the inorganic fibers comprise ceramic fibers or artificial mineral fibers comprising _{SiO 2 , MgO and CaO.} The glass melting furnace according to claim 12, wherein the heat insulating member has a temperature of a portion in contact with the heat-resistant block of 900°C or higher. The glass melting furnace according to claim 1 or 2, wherein the refractory block is a pole brick block of at least one refractory material selected from the group consisting of alumina, zirconia, alumina/zirconia, and alumina/zirconia/silica. The glass melting furnace according to claim 1 or 2, wherein the heat-resistant block is formed of an alumina-zirconia refractory material. The said heat-resistant block WHEREIN: The bulk specific gravity in 110 degreeC is 1.2 or less, and the thermal conductivity in 1000 degreeC is 0.7 W/(m*K) or less, The glass melting furnace of Claim 17. It is a glass manufacturing apparatus provided with a melting furnace, a molding furnace and an annealing furnace,
The said melting furnace is the glass melting furnace in any one of Claims 1-18, The glass manufacturing apparatus. It is a glass manufacturing method comprising a melting process, a forming process, and an annealing process in this order,
The said melting process WHEREIN: The glass manufacturing method in any one of Claims 1-18 using the glass melting furnace in any one of Claims 1-18.

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