CN110950522A - Glass melting furnace, glass melting method and glass manufacturing method - Google Patents
Glass melting furnace, glass melting method and glass manufacturing method Download PDFInfo
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- CN110950522A CN110950522A CN201910910853.1A CN201910910853A CN110950522A CN 110950522 A CN110950522 A CN 110950522A CN 201910910853 A CN201910910853 A CN 201910910853A CN 110950522 A CN110950522 A CN 110950522A
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- glass
- wall portion
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- side wall
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/167—Means for preventing damage to equipment, e.g. by molten glass, hot gases, batches
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/167—Means for preventing damage to equipment, e.g. by molten glass, hot gases, batches
- C03B5/1672—Use of materials therefor
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/235—Heating the glass
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/42—Details of construction of furnace walls, e.g. to prevent corrosion; Use of materials for furnace walls
- C03B5/43—Use of materials for furnace walls, e.g. fire-bricks
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Provided are a glass melting furnace, a glass melting method, and a glass manufacturing method, which can suppress erosion of molten glass to a side wall portion of a melting tank at an opening portion and suppress heat dissipation from the glass melting furnace. A glass melting furnace comprising a melting tank and an upper structure covering the upper part of the melting tank, wherein the melting tank comprises a bottom part and a side wall part, the upper structure comprises a horizontal wall part and a ceiling part arranged above the horizontal wall part, the side wall part comprises a first side wall part and a second side wall part, the first side wall part is positioned below the horizontal wall part, the second side wall part is positioned outside the part below the horizontal wall part and forms an opening with the horizontal wall part, a cooling member comprising a cooling structure and a refractory structure is arranged in the opening, the cooling structure is formed by a metal member, the refractory structure covers the periphery of the cooling structure, and the refractory structure is formed by an amorphous refractory.
Description
Technical Field
The present invention relates to a glass melting furnace, a glass melting method, and a glass manufacturing method.
Background
The glass melting furnace is provided with a melting tank for supplying glass raw materials to the inside and an upper structure for covering the upper part of the melting tank. In the glass melting furnace, an opening is formed in a portion of the melting tank that protrudes outward from the upper structure (for example, a raw material inlet, see fig. 6 of patent document 1).
Conventionally, a hanging brick or a heat insulating board is disposed outside an upper structure in an opening portion. This suppresses heat dissipation from the glass melting furnace and prevents scattering of the glass raw material.
Prior art documents
Patent document
Patent document 1: japanese laid-open patent publication No. 63-040730
Disclosure of Invention
Problems to be solved by the invention
However, if the glass melting furnace is of a conventional specification, the molten glass will corrode the side wall of the melting tank at the opening portion, which may adversely affect the service life of the glass melting furnace. This is considered to be because, particularly in the case where the opening is a raw material inlet, the glass raw material is supplied all the time and the glass raw material or molten glass flows largely.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a glass melting furnace and a glass melting method capable of suppressing erosion of a side wall portion of a melting tank by molten glass at an opening portion and suppressing heat dissipation from the glass melting furnace.
Means for solving the problems
The present invention provides a glass melting furnace including a melting tank to which a glass material is supplied and an upper structure covering an upper portion of the melting tank, wherein the melting tank includes a bottom portion and a side wall portion, the upper structure includes a horizontal wall portion and a ceiling portion disposed above the horizontal wall portion, the side wall portion includes a first side wall portion and a second side wall portion, the first side wall portion is located below the horizontal wall portion, the second side wall portion is located outside a portion located below the horizontal wall portion, an opening portion is formed between the second side wall portion and the horizontal wall portion, a cooling member is disposed in the opening portion, the cooling member includes a cooling structure and a refractory structure, the cooling structure is formed of a metal member, a flow path of a refrigerant is provided therein, and the refractory structure covers a periphery of the cooling structure, is formed of an unshaped refractory.
The present invention also provides a glass melting method for melting a glass raw material in a glass melting furnace including a melting tank into which the glass raw material is supplied and an upper structure covering an upper portion of the melting tank, the melting tank including a bottom portion and a side wall portion, the upper structure including a lateral wall portion and a ceiling portion disposed above the lateral wall portion, the side wall portion including a first side wall portion and a second side wall portion, the first side wall portion being located below the lateral wall portion, the second side wall portion being located outside a portion located below the lateral wall portion, an opening portion being formed between the second side wall portion and the lateral wall portion, a cooling member being disposed in the opening portion, the cooling member including a cooling structure formed of a metal member and having a flow path of a refrigerant therein, the refractory structure is formed of an amorphous refractory material so as to cover the periphery of the cooling structure.
Effects of the invention
According to the present invention, there are provided a glass melting furnace and a glass melting method capable of suppressing erosion of a side wall portion of a melting tank by molten glass at an opening portion and suppressing heat dissipation from the glass melting furnace.
Drawings
FIG. 1 is a drawing showing a glass melting furnace according to a first embodiment of the present invention, wherein (A) is a plan view, and (B) is a partial sectional view taken along line I-I of (A), and (C) is a partial sectional view taken along line II-II of (A).
FIG. 2 is a view showing a glass melting furnace according to a second embodiment of the present invention, wherein (A) is a plan view, and (B) is a partial sectional view taken along line III-III of (A), and (C) is a partial sectional view taken along line IV-IV of (A).
Fig. 3 is a view showing a cooling member according to an embodiment of the present invention, (a) is a plan view, (B) is a view showing a structure of the cooling structure (a), (C) is a side view, and (D) is a view showing a structure of the cooling structure (C).
Fig. 4 is a view showing a cooling member according to another embodiment of the present invention, wherein (a) is a plan view and (B) is a front view.
Fig. 5 is a view showing a part of the cooling structure of fig. 3, in which (a) is a side view and (B) is a sectional view.
Description of the reference symbols
10 melting tank
11 bottom part
12 side wall part
12A first side wall part
12B second side wall portion
20 superstructure
21 transverse wall part
22 ceiling part
30. 130 cooling member
31. 131 cooling structure
32 outer surface
33 fastening hanging component
35. 135 fire-resistant structure
40 hanging brick
50 throat
100. 200 glass melting furnace
G molten glass.
Detailed Description
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the present specification, "to" indicating a numerical range means a range including the numerical values before and after it.
In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the present specification, the X-axis direction is a flow direction of the molten glass G in a plan view, the Y-axis direction is a direction orthogonal to the flow direction of the molten glass G in a plan view, and the Z-axis direction is a vertical direction. The upstream side and the downstream side are the upstream side and the downstream side with respect to the X-axis direction, the + X side is the downstream side, and the-X side is the upstream side. The left and right sides are the left and right sides with respect to the center portion in the width direction (Y-axis direction) of the melting tank 10, and the + Y side is the left side and the-Y side is the right side.
[ glass melting furnace ]
(first embodiment)
FIG. 1 is a drawing showing a glass melting furnace according to a first embodiment of the present invention, wherein (A) is a plan view, and (B) is a partial sectional view taken along line I-I of (A), and (C) is a partial sectional view taken along line II-II of (A). A glass melting furnace according to a first embodiment of the present invention will be described with reference to fig. 1(a) to (C).
The glass melting furnace 100 includes a melting tank 10 into which a glass material is supplied, an upper structure 20 covering an upper portion of the melting tank 10, and a throat portion 50 provided in communication with the melting tank 10. The melting tank 10 includes a bottom portion 11 and a side wall portion 12. The upper structure 20 includes a lateral wall portion 21 and a ceiling portion 22 disposed above the lateral wall portion 21.
The side wall portion 12 includes a first side wall portion 12A and a second side wall portion 12B, the first side wall portion 12A is located below the lateral wall portion 21, the second side wall portion 12B is located outside a portion located below the lateral wall portion 21, and an opening is formed between the second side wall portion 12B and the lateral wall portion 21. In the present embodiment, the opening is a raw material inlet to which a glass raw material is supplied from a raw material supply device (not shown). A hanging brick 40 is provided on the outer side of the lateral wall part 21 of the raw material inlet, and cooling members 30, 130 are disposed on the outer side of the hanging brick 40.
The glass melting furnace 100 includes a burner (not shown) in the upper structure 20, and melts the glass material supplied to the inside of the melting tank 10 by combustion of the burner using fuel and gas to obtain molten glass G. The fuel uses natural gas or heavy oil, and the gas uses oxygen or air.
The side wall portion 12 of the melting tank 10 stands vertically with respect to the bottom portion 11. The bottom portion 11 and the side wall portion 12 are formed of electroformed bricks having excellent corrosion resistance because the inner sides thereof are in contact with the molten glass G. Examples of the electroformed bricks include zirconia bricks, alumina-zirconia-silica (AZS) bricks, and alumina bricks. The bottom portion 11 or the side wall portion 12 may be provided with a current-carrying electrode (not shown). The current-carrying electrode generates joule heat by applying a voltage, and melts the glass raw material to obtain molten glass G. Since the melting tank 10 is only required to be able to hold molten glass, the side wall portion 12 may be inclined upward relative to the bottom portion 11.
The upper structure 20 is supported by a support structure (not shown) provided outside the melting tank 10. In a cross section perpendicular to the X-axis direction, the lateral wall portion 21 extends vertically, and the ceiling portion 22 has an arch shape. The horizontal wall portion 21 and the ceiling portion 22 are formed of electroformed bricks having excellent corrosion resistance because the insides thereof are in contact with a high-temperature furnace atmosphere.
The raw material inlet has a width sufficient for installing a raw material supply device on the left and right sides with respect to the center portion in the width direction (Y-axis direction) of the melting tank 10. The cooling member 30 is disposed at the center in the width direction (Y-axis direction) of the raw material inlet. The cooling means 130 is arranged on the left and right sides with respect to the center in the width direction (Y-axis direction) of the raw material inlet so as to ensure a sufficient space required for supplying the glass raw material from the raw material supply device. Here, the cooling member 30 or 130 is provided with a refractory structure described later, and covers a part of the raw material inlet. In the present embodiment, by providing the cooling members 30 and 130, erosion of the side wall portion 12B of the melting tank 10 by the molten glass G can be suppressed at the raw material feed port, and heat dissipation from the glass melting furnace 100 can be suppressed. Further, the glass raw material is not excessively cooled and consolidated, and therefore the glass raw material can be stably supplied.
The hanging brick 40 is suspended by a support steel material (not shown) provided outside the lateral wall portion 21, and is provided with a height adjusting mechanism. The height of the hanging brick 40 is adjusted according to the amount of the glass raw material supplied. When the supply amount is small, the hanging brick 40 is lowered to suppress heat dissipation from the glass melting furnace 100. On the other hand, when the supply amount is large, the hanging brick 40 is lifted so that the glass raw material is supplied without being accumulated in the glass melting furnace 100. In the present embodiment, the cooling members 30 and 130 are disposed outside the hanger brick 40, but a hanger brick may be provided between the hanger brick 40 and the cooling members 30 and 130.
The throat portion 50 is provided to communicate with the widthwise (Y-axis) center of the downstream end of the melting tank 10, and conveys the molten glass G toward a clarifying tank or a forming furnace. The inner side of the throat portion 50 is in contact with the molten glass G, and therefore, is formed of an electroformed brick having excellent corrosion resistance.
(second embodiment)
FIG. 2 is a view showing a glass melting furnace according to a second embodiment of the present invention, wherein (A) is a plan view, and (B) is a partial sectional view taken along line III-III of (A), and (C) is a partial sectional view taken along line IV-IV of (A). A glass melting furnace according to a second embodiment of the present invention will be described with reference to fig. 2(a) to (C). Only the differences from the first embodiment will be described below.
The glass melting furnace 200 differs from the glass melting furnace 100 in which the number of raw material inlets is 1 in that the number of raw material inlets is 2 on the left and right with respect to the center portion in the width direction (Y-axis direction) of the melting tank 10. A raw material supply device (not shown) is provided to each of the 2 raw material inlets. In the second embodiment, since the widthwise (Y-axis direction) center of the melting tank 10 is the first side wall 12A, the raw material inlet is not formed in the widthwise (Y-axis direction) center, and the cooling member 30 of the first embodiment is not disposed.
In the first and second embodiments, the opening is a raw material inlet, but the present invention is not limited thereto. The opening may be an opening for discharging the molten glass G. By providing the cooling member in the opening portion, erosion of the side wall portion of the melting tank 10 by the molten glass G can be suppressed, heat dissipation from the glass melting furnace 100 can be suppressed, and the molten glass can be stably discharged without rapid cooling.
(Cooling Member)
Fig. 3 is a view showing a cooling member according to an embodiment of the present invention, (a) is a plan view, (B) is a view showing a structure of the cooling structure (a), (C) is a side view, and (D) is a view showing a structure of the cooling structure (C). A cooling member according to an embodiment of the present invention will be described with reference to fig. 3(a) to (D).
The cooling member 30 includes a cooling structure 31 and a refractory structure 35. The cooling structure 31 is formed of a metal member and has a flow path of a coolant therein. The refractory structure 35 is formed of an amorphous refractory material covering the periphery of the cooling structure 31. As the metal member, for example, a metal such as steel or a heat-resistant alloy is used. As the refrigerant, for example, a gas such as air or nitrogen may be used in addition to a liquid such as water or oil. In the present specification, the monolithic refractory refers to a monolithic refractory obtained by applying a powder composition for monolithic refractory. The amorphous refractory powder composition is not particularly limited, but includes, as basic components, aggregate, binder, and refractory fine powder.
The cooling structure 31 includes a flow path configured such that a refrigerant flows in from the upstream side (-X side) toward the downstream side (+ X side), flows in from the left side (+ Y side) toward the right side (-Y side), and flows out from the downstream side (+ X side) toward the upstream side (-X side). As shown in fig. 3(B), the flow path has a winding shape in a portion of the refractory structure 35 covering the periphery of the cooling structure 31. Specifically, the flow path in this portion has a winding shape, and the refrigerant flows 2 times upstream (on the (-X side) and downstream (on the (+ X side)). Thus, the refractory structure 35 can be cooled over the entire structure using 1 continuous flow path, and erosion of the side wall of the melting tank by the molten glass can be effectively suppressed. As shown in fig. 3D, the height of the 1 continuous flow path of the cooling structure 31 in the vertical direction (Z-axis direction) is the same.
In the present embodiment, the refrigerant inlet is on the left side (+ Y side) and the refrigerant outlet is on the right side (-Y side), but the refrigerant inlet may be on the right side (-Y side) and the refrigerant outlet may be on the left side (+ Y side). Further, a plurality of continuous flow paths may be used for the cooling structure 31. The flow path of the portion surrounded by the refractory structure 35 may be configured such that the refrigerant flows 3 times or more upstream (on the (-X side) and downstream (on the (+ X side)). In the cooling structure 31, the height in the vertical direction (Z-axis direction) of 1 continuous flow path may be different, and the flow path may be provided with an inclination or a step. The flow path of the cooling structure 31 may not have a winding shape.
The refractory structure 35 is obtained by pouring a material obtained by adding water to the monolithic refractory powder composition into a mold frame formed around the cooling structure 31 and drying the material. In the present embodiment, the shape is a rectangular parallelepiped, but the present invention is not limited thereto.
The unshaped refractory contains at least 80 mass% of Al2O3The alumina of (2) preferably has a bulk density of 2.5 or more at 110 ℃. The monolithic refractory is more preferably one containing at least 85 mass% of Al2O3More preferably, it contains 90 mass% or more of Al2O3. The bulk density at 110 ℃ is more preferably 2.8 or more, and still more preferably 3.0 or more. In order to make the refractory structure 35 less likely to crack, the bulk density at 110 ℃ is preferably 5.0 or less, and more preferably 4.5 or less. The unshaped refractory contains at least 80 mass% of Al2O3Thereby being excellent in heat resistance. Further, the strength of the refractory structural body 35 can be ensured by setting the bulk density at 110 ℃ to 2.5 or more. In the present specification, the bulk density at 110 ℃ means the bulk density of the unshaped refractory after being dried at 110 ℃ for 24 hours. The bulk density in the present specification is measured in accordance with JIS R2205 "measuring methods for the apparent porosity, water absorption, and specific gravity of refractory bricks".
The monolithic refractory is preferably an aluminum silicate. In the present specification, aluminum silicate means Al2O3And SiO2Has a total content of 80 mass% or more and SiO2The content of (3) is 5% by mass or more. If the monolithic refractory is an aluminum silicate, the monolithic refractory is excellent in heat resistance and corrosion resistance to glass vapor.
The unshaped refractory may contain SiO in an amount of 80 mass% or more2Is a silicon compound. When the monolithic refractory is siliceous, the refractory is excellent in heat resistance and corrosion resistance to glass vapor.
The amorphous refractory has a thermal conductivity at 500 ℃ of preferably 2.5W/(mK) or more, more preferably 3.0W/(mK) or more, and still more preferably 3.5W/(mK) or more. The thermal conductivity at 500 ℃ is preferably 10W/(mK) or less, more preferably 9W/(mK) or less. When the thermal conductivity at 500 ℃ is 2.5W/(mK) or more, the refractory structure 35 can be efficiently cooled by the cold air from the cooling structure 31, and further, the erosion of the side wall portion of the melting tank by the molten glass can be sufficiently suppressed. The thermal conductivity is a value measured by a hot wire method in accordance with JIS R2251-1.
The cooling member 30 preferably includes a suspension member. The suspending member is connected to the cooling structure 31 and protrudes from the upper portion of the refractory structure 35. The suspension member is suspended by a support steel material (not shown) provided outside the lateral wall portion 21. This makes it possible to easily adjust the height of the cooling member 30. In a state where the suspending member is connected to the cooling structure 31, a material obtained by adding water to the monolithic refractory powder composition is poured into a mold frame formed around the cooling structure 31, and dried to obtain the cooling member 30 including the suspending member.
Fig. 4 is a view showing a cooling member according to another embodiment of the present invention, wherein (a) is a plan view and (B) is a front view. A cooling member according to another embodiment of the present invention will be described with reference to fig. 4(a) and (B). Hereinafter, only the differences from the cooling member according to one embodiment of the present invention will be described.
The cooling structure 131 includes a flow path configured such that the refrigerant flows in from the right side (-Y side) to the left side (+ Y side), flows from the upper side to the lower side, and flows out from the left side (+ Y side) to the right side (-Y side). The cooling member 130 provided with the cooling structure 131 of the present embodiment is the cooling member 130 disposed on the right side (-Y side) with respect to the center in the width direction (Y axis direction) of the melting tank 10 in the cooling member 130 shown in fig. 1(a) and 2 (a). As shown in fig. 4(a), the positions of the 1 continuous channels of the cooling structure 131 in the X-axis direction are the same.
In the present embodiment, the inlet port of the refrigerant is the upper side and the outlet port is the lower side, but the inlet port may be the lower side and the outlet port may be the upper side. The cooling member 130 provided with the cooling structure 131 of the above-described form is the cooling member 130 disposed on the left side (+ Y side) with respect to the center portion in the width direction (Y axis direction) of the melting tank 10 in the cooling member 130 shown in fig. 1 a and 2 a. In addition, in the cooling structure 131, the positions of 1 continuous flow path in the X axis direction may be different, or an inclination or a step may be provided in the flow path.
Fig. 5 is a view showing a part of the cooling structure of fig. 3, in which (a) is a side view and (B) is a sectional view. A cooling structure according to an embodiment of the present invention will be described with reference to fig. 5(a) and (B).
The cooling structure 31 preferably includes a protruding engaging member 33 on an outer surface 32 of a portion that is covered with the refractory structure, and may include a plurality of engaging members 33. By providing the plurality of engaging members 33, even if the cooling member is continuously used for a long period of time at the raw material charging port, the refractory structure can be prevented from being peeled off from the cooling structure 31. The engaging members 33 are provided at intervals in the flow direction of the refrigerant as shown in fig. 5(a), and at intervals in the circumferential direction of the flow path as shown in fig. 5 (B). The 4 engaging members 33 are provided along the circumferential direction of the flow path, but 2, 3, or 5 or more engaging members 33 may be provided. The cross-sectional shape of the flow path is square, but may be rectangular, circular or elliptical.
Similarly to the cooling structure 31, the cooling structure 131 according to another embodiment of the present invention may include a projecting engagement member on the outer surface of the portion that is covered with the refractory structure.
[ glass melting method ]
A glass melting method according to an embodiment of the present invention will be described.
The glass melting method melts a glass raw material in a glass melting furnace having a melting tank to which the glass raw material is supplied and an upper structure covering an upper portion of the melting tank. The flame of a burner provided in a glass melting furnace is radiated toward a glass raw material, thereby heating the glass raw material from above. The glass raw material may be heated by flame of a burner and electrified by applying a voltage to a plurality of electrified electrodes to generate joule heat.
The melting tank has a bottom portion and a side wall portion. The upper structure includes a lateral wall portion and a ceiling portion disposed above the lateral wall portion. The side wall portion includes a first side wall portion located below the lateral wall portion and a second side wall portion located outside a portion located below the lateral wall portion and forming an opening with the lateral wall portion.
The opening is provided with a cooling member. The cooling member includes a cooling structure and a refractory structure. The cooling structure is formed of a metal member and has a flow path for a coolant therein. The refractory structure covers the periphery of the cooling structure and is formed of an amorphous refractory.
In the glass melting method, the cooling member is disposed in the opening portion, so that erosion of the side wall portion of the melting tank by the molten glass can be suppressed in the opening portion, and heat dissipation from the glass melting furnace can be suppressed.
[ method for producing glass ]
A glass manufacturing method according to an embodiment of the present invention will be described.
The glass manufacturing method includes a melting step using a glass melting method, a forming step of forming molten glass in a forming furnace provided downstream of the glass melting furnace, and a slow cooling step of slowly cooling the formed glass in a slow cooling furnace provided downstream of the forming furnace, thereby obtaining a glass article.
The glass production method may include a clarifying step between the melting step and the forming step. The clarification step is a step of supplying the molten glass obtained in the melting step to a clarification tank, and removing bubbles in the molten glass by floating them. As a method for promoting the rising of bubbles, for example, there is a method of deaerating by reducing the pressure in a clarifying tank.
To obtain a glass sheet as a glass article, for example, a float process may be used. The float process is a method of forming a glass ribbon in a band plate shape by flowing molten glass introduced onto molten metal (for example, molten tin) contained in a float bath in a predetermined direction. After being cooled while flowing in the horizontal direction, the glass ribbon is pulled up from the molten metal, and is gradually cooled while being conveyed in a slow cooling furnace, thereby forming sheet glass. After being sent out from the annealing furnace, the sheet glass is cut into a predetermined size and shape by a cutting machine, and a glass sheet as a product is obtained.
As another molding method for obtaining a glass sheet, a fusion method can be used. The melting method is a method of forming a glass ribbon in a band-plate shape by causing molten glass overflowing from upper edges of left and right sides of a barrel member to flow down along left and right side surfaces of the barrel member and merging at the lower edges where the left and right side surfaces intersect. The molten glass ribbon is gradually cooled while moving vertically downward, and becomes sheet glass. The sheet glass is cut into a predetermined size and shape by a cutter to obtain a glass sheet as a product.
The composition of the glass raw material used in the present embodiment is not particularly limited, and may be any of alkali-free glass, aluminosilicate glass, mixed alkali glass, borosilicate glass, and other glass.
While the present invention has been described in detail with reference to the specific embodiments, it is obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention.
The present application is based on japanese patent application 2018-181721, filed on 27.9.2018, the contents of which are incorporated herein by reference.
Industrial applicability
The float glass produced may be used for various applications such as architectural use, vehicle use, flat panel display use, cover glass use, and others.
Claims (10)
1. A glass melting furnace comprising a melting tank to which a glass material is supplied and an upper structure covering an upper part of the melting tank,
the melting tank is provided with a bottom part and a side wall part,
the upper structure is provided with a horizontal wall part and a ceiling part arranged above the horizontal wall part,
the side wall portion includes a first side wall portion located below the lateral wall portion, and a second side wall portion located outside a portion located below the lateral wall portion, and an opening is formed between the second side wall portion and the lateral wall portion,
a cooling member is disposed in the opening portion,
the cooling member includes a cooling structure and a refractory structure,
the cooling structure is formed of a metal member and has a flow path for a coolant therein,
the refractory structure is formed of an amorphous refractory material so as to cover the periphery of the cooling structure.
2. The glass melting furnace according to claim 1,
the amorphous refractory material contains at least 80 mass% of Al2O3The alumina of (2) has a bulk density of 2.5 or more at 110 ℃.
3. The glass melting furnace according to claim 1,
the unshaped refractory is aluminum silicate.
4. A glass melting furnace according to any one of claims 1 to 3,
the amorphous refractory has a thermal conductivity of 2.5W/(mK) or more at 500 ℃.
5. A glass melting furnace according to any one of claims 1 to 3,
the cooling member is provided with a suspension member,
the suspension member is connected to the cooling structure and protrudes from an upper portion of the refractory structure.
6. A glass melting furnace according to any one of claims 1 to 3,
the flow path has a winding shape at a portion where the refractory structure covers the periphery of the cooling structure.
7. A glass melting furnace according to any one of claims 1 to 3,
the cooling structure includes a projecting engaging member on an outer surface of a portion of the cooling structure around which the refractory structure is covered.
8. A glass melting furnace according to any one of claims 1 to 3,
the opening part is a raw material input opening,
the raw material inlet is provided with a hanging brick outside the lateral wall portion, and the cooling member is disposed outside the hanging brick.
9. A glass melting method for melting a glass raw material in a glass melting furnace having a melting tank to which the glass raw material is supplied and an upper structure covering an upper portion of the melting tank,
the melting tank is provided with a bottom part and a side wall part,
the upper structure is provided with a horizontal wall part and a ceiling part arranged above the horizontal wall part,
the side wall portion includes a first side wall portion located below the lateral wall portion, and a second side wall portion located outside a portion located below the lateral wall portion, and an opening is formed between the second side wall portion and the lateral wall portion,
a cooling member is disposed in the opening portion,
the cooling member includes a cooling structure and a refractory structure,
the cooling structure is formed of a metal member and has a flow path for a coolant therein,
the refractory structure is formed of an amorphous refractory material so as to cover the periphery of the cooling structure.
10. A method of making glass comprising:
a melting step of using the glass melting method according to claim 9;
a forming step of forming molten glass in a forming furnace provided downstream of the glass melting furnace; and
and a slow cooling step of performing slow cooling of the formed glass in a slow cooling furnace provided downstream of the forming furnace.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018181721A JP2020050545A (en) | 2018-09-27 | 2018-09-27 | Glass melting furnace and glass melting method |
| JP2018-181721 | 2018-09-27 |
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| CN110950522A true CN110950522A (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910910853.1A Pending CN110950522A (en) | 2018-09-27 | 2019-09-25 | Glass melting furnace, glass melting method and glass manufacturing method |
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| CN (1) | CN110950522A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116194728A (en) * | 2020-10-08 | 2023-05-30 | Ａｇｃ株式会社 | Glass melting device, method for producing glass, and method for replacing molten glass material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB169304A (en) * | 1920-07-02 | 1921-09-29 | Robert Leonardson Frink | Improvements in or relating to glass melting furnaces |
| GB1231653A (en) * | 1967-06-21 | 1971-05-12 | ||
| US3932165A (en) * | 1973-03-06 | 1976-01-13 | Ppg Industries, Inc. | Method and apparatus for forming a ribbon of glass on a bath of molten metal |
| CN202022839U (en) * | 2011-04-12 | 2011-11-02 | 安徽华强玻璃科技有限公司 | Feeding premelting tank for crystal glass kiln |
| CN104591746A (en) * | 2013-11-01 | 2015-05-06 | 大石桥市中建镁砖有限公司 | Novel A-C refractory material for cement kilns, and preparation method thereof |
-
2018
- 2018-09-27 JP JP2018181721A patent/JP2020050545A/en active Pending
-
2019
- 2019-09-25 CN CN201910910853.1A patent/CN110950522A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB169304A (en) * | 1920-07-02 | 1921-09-29 | Robert Leonardson Frink | Improvements in or relating to glass melting furnaces |
| GB1231653A (en) * | 1967-06-21 | 1971-05-12 | ||
| US3932165A (en) * | 1973-03-06 | 1976-01-13 | Ppg Industries, Inc. | Method and apparatus for forming a ribbon of glass on a bath of molten metal |
| CN202022839U (en) * | 2011-04-12 | 2011-11-02 | 安徽华强玻璃科技有限公司 | Feeding premelting tank for crystal glass kiln |
| CN104591746A (en) * | 2013-11-01 | 2015-05-06 | 大石桥市中建镁砖有限公司 | Novel A-C refractory material for cement kilns, and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116194728A (en) * | 2020-10-08 | 2023-05-30 | Ａｇｃ株式会社 | Glass melting device, method for producing glass, and method for replacing molten glass material |
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|---|---|
| JP2020050545A (en) | 2020-04-02 |
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