WO2021125040A1 - ガラス溶解用のヒータ - Google Patents

ガラス溶解用のヒータ Download PDF

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Publication number
WO2021125040A1
WO2021125040A1 PCT/JP2020/046033 JP2020046033W WO2021125040A1 WO 2021125040 A1 WO2021125040 A1 WO 2021125040A1 JP 2020046033 W JP2020046033 W JP 2020046033W WO 2021125040 A1 WO2021125040 A1 WO 2021125040A1
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WO
WIPO (PCT)
Prior art keywords
heat generating
generating portion
heater
heat
tubular member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/046033
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
輝敬 前原
章文 丹羽
俊太郎 兵頭
幸仁 秋田
高志 榎本
洋二 土井
ロジャー ポウリ
ローレンス キーン
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGC Inc
Original Assignee
Asahi Glass Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Glass Co Ltd filed Critical Asahi Glass Co Ltd
Priority to EP20903796.9A priority Critical patent/EP4080990B1/en
Priority to CN202080086267.0A priority patent/CN114788407A/zh
Priority to JP2021565529A priority patent/JP7618933B2/ja
Publication of WO2021125040A1 publication Critical patent/WO2021125040A1/ja
Priority to US17/840,263 priority patent/US12356511B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
    • C03B5/033—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by using resistance heaters above or in the glass bath, i.e. by indirect resistance heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/02—Ohmic resistance heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/03—Electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/04—Waterproof or air-tight seals for heaters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/145—Carbon only, e.g. carbon black, graphite
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/62—Heating elements specially adapted for furnaces
    • H05B3/64—Heating elements specially adapted for furnaces using ribbon, rod, or wire heater
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • H05B3/82—Fixedly-mounted immersion heaters
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/025—Heaters specially adapted for glass melting or glass treatment

Definitions

  • the present invention relates to a heater for melting glass.
  • a set of electrodes is often used when manufacturing molten glass in a melting furnace.
  • Each electrode is mounted "vertically" from the bottom side of the melting furnace so as to penetrate the bottom.
  • Molten glass can be obtained by energizing an electrode set having such an arrangement with an electric current.
  • the dimensions of the cross section perpendicular to the extending direction of these through holes are usually selected to be sufficiently larger than the dimensions of the cross section perpendicular to the axial direction of the electrode. This is because during the production of molten glass, the electrode abuts on the side wall forming the through hole due to the difference in the magnitude of thermal expansion between the material of the melting furnace and the electrode material, and the electrode or the melting furnace is damaged. This is to prevent.
  • a cooling member is usually provided around the electrode.
  • a part of the cooling member is provided at a position facing the lower surface of the bottom of the melting furnace when the electrode is inserted into the melting furnace.
  • the cooling member installed in this way By supplying a refrigerant such as air or water to the cooling member installed in this way, it is possible to solidify the molten glass that falls through the gap during the production of the molten glass. Further, the solidified glass layer can be used as a sealing material for closing the gap.
  • a refrigerant such as air or water
  • such a cooling member is not very desirable from the viewpoint of glass heating efficiency. That is, the presence of such a cooling member acts in a direction of lowering the temperature of the molten glass at the bottom of the melting furnace. Therefore, the heating efficiency of the glass is lowered.
  • the electrode itself is not a heating element, in such a situation, in order to give a desired temperature history to the entire molten glass, additional equipment is required so that the molten glass can be circulated by convection. For example, it is necessary to increase the size of the melting furnace and install a stirring device. However, such measures lead to an increase in the cost of manufacturing equipment.
  • the present invention has been made in view of such a background, and an object of the present invention is to provide a heater for melting glass, which can significantly increase the heating efficiency of molten glass as compared with the prior art. To do.
  • the present invention is a heater for melting glass.
  • a heat-generating member containing carbon (C) that radiates heat rays by feeding power A metal tubular member with one end closed, which accommodates the heat generating member, Have, The heat-generating member has a first heat-generating portion and a second heat-generating portion along the stretching axis direction of the heater, and the first heat-generating portion is more than the second heat-generating portion.
  • the resistance per unit length of the first heat generating portion along the stretching axis direction is defined as X ( ⁇ / m)
  • the resistance of the second heat generating portion per unit length along the stretching axis direction is defined as X ( ⁇ / m).
  • FIG. 1 schematically shows a state when a conventional set of electrodes 20 is installed in the glass melting furnace 1.
  • the glass melting furnace 1 has a structure capable of accommodating the molten glass MG in the accommodating space 2. Specifically, the melting furnace 1 has a side portion 3 and a bottom portion 5 surrounded by the side portion 3. The bottom portion 5 has an upper surface 7 and a lower surface 9. The upper surface 7 is the surface of the bottom 5 on the side in contact with the molten glass MG, and the lower surface 9 is the surface opposite to the upper surface 7 of the bottom 5.
  • the melting furnace 1 has a through hole 10 at the bottom 5 that penetrates from the upper surface 7 to the lower surface 9.
  • the electrode 20 is composed of a main body 22 and a lead member 24.
  • the main body 22 is made of, for example, rod-shaped platinum or molybdenum.
  • the lead member 24 is installed near one end of the main body 22. Further, the other end (referred to as "tip") 26 of the main body 22 is inserted into the accommodation space 2 through the through hole 10 of the bottom 5 of the melting furnace 1.
  • the dimension of the cross section perpendicular to the extending direction of the through hole 10 is selected so as to be sufficiently larger than the dimension of the cross section perpendicular to the main body 22 axis direction of the electrode 20.
  • the electrode 20 is usually provided with a cooling member 12.
  • the cooling member 12 has a first portion 13 and a second portion 15.
  • the first portion 13 of the cooling member 12 is provided at a position facing the lower surface 9 of the bottom portion 5 of the melting furnace 1 when the electrode 20 is inserted into the melting furnace 1.
  • the second portion 15 of the cooling member 12 is provided at a position facing the side wall 11 forming the through hole 10 of the bottom portion 5 of the melting furnace 1.
  • a refrigerant such as air or water is circulated through the cooling member 12.
  • the lead member 24 of the electrode 20 is connected to a power feeding device 28 such as an external voltage source.
  • a power feeding device 28 such as an external voltage source.
  • an electric current flows between both electrodes 20 through the molten glass, and the molten glass can be energized and heated.
  • the molten glass can be heated to a desired temperature.
  • the accommodation space 2 of the melting furnace 1 is filled with the molten glass MG, and the molten glass MG is Joule-heated by passing an alternating current between the electrodes inserted in the molten glass.
  • a cooling member 12 is used to deal with such leakage. That is, by supplying the refrigerant to the first portion 13 and the second portion 15 of the cooling member 12, the molten glass MG moving along the gap 17 can be cooled and solidified in the middle of the side wall 11. Further, the solidified glass layer can be used as a sealing material for the gap 17.
  • the second portion 15 of the cooling member 12 is installed at a position relatively close to the upper surface 7 of the bottom 5 of the melting furnace 1, that is, the molten glass MG. Therefore, the second portion 15 of the cooling member 12 acts in a direction of lowering the temperature of the molten glass MG. Especially on the upper side of the second portion 15 of the cooling member 12, it becomes difficult to rapidly raise the temperature of the molten glass MG. As a result, there may be a problem that the heating efficiency of the molten glass is lowered.
  • the effect of lowering the temperature of the molten glass MG is smaller than that of the second portion 15.
  • it is a heater for melting glass.
  • a heat-generating member containing carbon (C) that radiates heat rays by feeding power A metal tubular member with one end closed, which accommodates the heat generating member, Have, The heat-generating member has a first heat-generating portion and a second heat-generating portion along the stretching axis direction of the heater, and the first heat-generating portion is more than the second heat-generating portion.
  • the resistance per unit length of the first heat generating portion along the stretching axis direction is defined as X ( ⁇ / m), and the resistance of the second heat generating portion per unit length along the stretching axis direction is defined as X ( ⁇ / m).
  • the molten glass MG is heated by using a heater instead of the electrode 20.
  • the heater according to the embodiment of the present invention has a configuration in which the heat generating member is housed in a metal tubular member.
  • the tubular member can be heated by a radiation method using the heat rays from the heating element, and the molten glass MG can be heated by using the heated tubular member.
  • a heat generating member containing carbon (C) is used.
  • the heat generating member of the heater As the heat generating member of the heater according to the embodiment of the present invention, one or more kinds selected from metals (for example, molybdenum, tungsten, tantalum, niobium, iridium, platinum, and rhodium) often used for the heat generating member of the heater are used.
  • metals for example, molybdenum, tungsten, tantalum, niobium, iridium, platinum, and rhodium
  • the heat generating member may be deformed by its own weight during use of the heater. This is because the temperature of the molten glass MG is often 1600 ° C. or higher, and therefore the heat generating member may be 1800 ° C. or higher.
  • a heat generating member containing carbon (C), which is less deformed even at a high temperature of 1800 ° C. or higher, is used. Therefore, in one embodiment of the present invention, deformation of the heat generating member during use can be significantly suppressed.
  • the heat generating member has a first heat generating portion and a second heat generating portion.
  • the first heat-generating part of the heater that becomes hotter is installed in the accommodation space of the molten glass MG in the melting furnace 1, and the second heat-generating part that does not reach as high a temperature as the first heat-generating part is the melting furnace. It can be arranged so as to face the through hole 10 (or its side wall 11) provided in the bottom portion 5 of 1.
  • the boundary between the first heat generating portion and the second heat generating portion is located on the accommodation space 2 side or the through hole 10 side of the upper surface 7 of the bottom 5 of the melting furnace 1 as long as it does not affect the melting of the glass. , May be slightly off.
  • the temperature of the through hole 10 (or its side wall 11) at the bottom 5 of the melting furnace 1 does not rise too much and is an appropriate temperature. Can be done. Therefore, even if the second portion 15 of the cooling member 12 is not used at all, or the cooling capacity of the second portion 15 of the cooling member 12 is reduced, or the second portion 15 of the cooling member 12 Even if the length is shortened and the distance from the accommodating portion 2 of the melting furnace 1 is increased, in the gap 17, the molten glass MG is moved along the gap 17 over a significant length to protect the heater surface. It becomes possible to solidify.
  • the heating efficiency can be significantly increased in the manufacturing process of the molten glass MG.
  • the main body 22 when the main body 22 is composed of molybdenum, a problem of high temperature oxidation may occur. That is, if the main body 22 is exposed in the portion facing the through hole 11, there may be a problem that the main body 22 is oxidized by high temperature air and the electrodes are deteriorated.
  • the molten glass MG can be moved along the gap 17 and the surface of the heater can be covered with solidified glass due to the above-mentioned effect. Therefore, in one embodiment of the present invention, a material that is easily oxidized by high-temperature air, such as molybdenum, can also be used as the tubular member.
  • FIG. 2 schematically shows an example of the structure of the heater according to the embodiment of the present invention.
  • FIG. 2 generally shows a cross section along the extension axis of the heater according to one embodiment of the present invention.
  • the portion of the heat generating member 120 which will be described later, is drawn in a non-cross-sectional form for clarification.
  • the heater 100 As shown in FIG. 2, the heater (hereinafter, referred to as “first heater”) 100 according to the embodiment of the present invention extends from the first heater end 102A to the second heater end 102B. It has a rod-like shape.
  • the first heater end 102A is closed by the lid member 170. Further, the second heater end 102B is closed by the closing end of the tubular member 130, which will be described later. Therefore, an internal space 110 is formed inside the first heater 100 so as to be shielded from the outside world.
  • the internal space 110 can be controlled to a desired atmosphere by a gas supply means and / or a gas discharge means (not shown) installed in the first heater 100.
  • the internal space 110 is preferably made into a non-oxidizing gas atmosphere in order to suppress oxidation of various members housed in the internal space 110 during use of the first heater 100.
  • the interior space 110 may be filled with an inert gas such as argon.
  • the first heater 100 has a heat generating member 120 and a tubular member 130.
  • the heat generating member 120 is housed in the internal space 110.
  • the tubular member 130 together with the lid member 170 described above, is a member that partitions the internal space 110 of the first heater 100, and the tubular member 130 protects each member housed in the internal space 110. .. One end of the tubular member 130 is closed, and this closed end corresponds to the second heater end 102B in the first heater 100.
  • the tubular member 130 is made of a heat-resistant metal.
  • the heat generating member 120 functions as a heating element that generates heat when energized.
  • the heat generating member 120 is made of a conductive material and contains carbon (C).
  • the heat generating member 120 has a first heat generating unit 122 and a second heat generating unit 124 that are electrically connected to each other.
  • the first heat generating portion 122 is arranged at a position closer to the second heater end portion 102B than the second heat generating portion 124.
  • the first heat generating portion 122 of the heat generating member 120 is one end thereof, that is, the end portion opposite to the end portion connected to the second heat generating portion, and the first lead wire 180A. Is electrically connected to. Further, the second heat generating portion 124 is electrically connected to the second lead wire 180B at one end thereof, that is, an end portion opposite to the end portion connected to the first heat generating portion.
  • the first lead wire 180A is led out from the first opening 172A provided in the lid member 170 to the outside of the internal space 110.
  • the second lead wire 180B is led out from the second opening 172B provided in the lid member 170 to the outside of the internal space 110.
  • a first insulating member 175A is attached to the first opening 172A of the lid member 170.
  • a second insulating member 175B is attached to the second opening 172B of the lid member 170.
  • the resistance per unit length along the stretching axis direction of the first heater 100 is set to X ( ⁇ / m), and the second heating portion In 124, when the resistance per unit length along the extension axis direction of the first heater 100 is Y ( ⁇ / m). (1/30) X ⁇ Y ⁇ (1/2) X (1) Is established.
  • resistor X the resistors X and Y per unit length are simply referred to as “resistor X” and “resistor Y”, respectively.
  • the first heat generating unit 122 can reach a higher temperature than the second heat generating unit 124.
  • the resistance X of the first heat generating portion 122 does not have to be constant over the entire length, and may be increased or decreased within a range of less than ⁇ 25%. The same can be said for the resistor Y of the second heat generating portion 124.
  • a portion showing a resistance between the two that is, a resistance smaller than the resistance X and larger than the resistance Y (hereinafter referred to as “transition region”).
  • a resistance change may occur, for example, in a form in which the cross-sectional area gradually increases from the portion in contact with the first heat generating portion 122 to the portion in contact with the second heat generating portion 124 in the transition region.
  • the "boundary" between the first heat generating portion 122 and the second heat generating portion 124 is defined as a portion indicating an intermediate resistance value between X and Y in the transition region.
  • the resistance per unit length of the transition region between the first heat generating portion 122 and the second heat generating portion 124 may be smaller than Y. Such a resistance change can occur, for example, when the separately manufactured first heat generating portion 122 and the second heat generating portion are joined via a highly rigid thick-walled joining member.
  • the "boundary" between the first heat generating portion 122 and the second heat generating portion 124 is defined as an intermediate position in the axial direction of the joining member.
  • the resistance X per unit length of the first heat generating portion 122 and the resistance Y per unit length of the second heat generating portion 124 are obtained by the general-purpose thermo-fluid analysis software STAR-CCM + (manufactured by SIEMENS).
  • the resistance X per unit length of the first heat generating portion 122 will be specifically described as an example.
  • 1. The shape data of the heat generating member 120 in STL format is taken into STAR-CCM +. 2. Enter the physical property values such as the electrical conductivity of the material of the member used for the heat generating member 120. At this time, the value of room temperature is used for the electric conductivity, and no temperature dependence is given. 3. 3. 3.
  • the calculation is executed under the condition that an arbitrary current I is passed through both terminals of the heat generating member connected to the lead wire, and the output distribution N (W / m 2 ) of the heat generating member 120 is obtained. 4.
  • Two surfaces that are perpendicular to the axial direction of the heat generating member 120 and have a distance L are set.
  • the output P (W) of the region is obtained by integrating the output distribution N of the region sandwiched between the two surfaces. At this time, one surface is a surface that crosses the upper end of the heat generating member 120, and the other surface is a surface that crosses the boundary between the first heat generating portion 122 and the second heat generating portion 124, so that the output of the first heat generating portion 122 is output.
  • P is obtained.
  • the resistance R in the region is obtained by dividing the output P by the current I 2. 6. By dividing the resistor R by the distance L, the resistor X per unit length can be obtained.
  • the resistance Y per unit length of the second heat generating portion 124 also crosses the boundary between the first heat generating portion 122 and the second heat generating portion 124, with one surface crossing the lower end of the heat generating member 120 and the other surface crossing the boundary between the first heat generating portion 122 and the second heat generating portion 124.
  • the area can be divided and obtained by the same method.
  • FIG. 3 schematically shows a state when the first heater 100 is installed in the glass melting furnace 1.
  • the configuration of the melting furnace 1 has already been described with reference to FIG. 1 described above. Therefore, here, a detailed description of the configuration of the melting furnace 1 will be omitted except for matters related to one embodiment of the present invention.
  • the first portion 13 of the cooling member 12 in FIG. 1 is attached to the bottom 5 of the melting furnace 1 instead of the first heater 100. .. Further, in the example shown in FIG. 3, the second portion 15 of the cooling member 12 in FIG. 1 is removed.
  • the first heater 100 when using the first heater 100, first, the first heater 100 is installed in the melting furnace 1.
  • the first heater 100 is installed "vertically" so that the side of the second heater end 102B is inserted into the accommodation space 2 through the through hole 10 of the bottom 5 of the melting furnace 1. ..
  • the glass raw material is supplied into the accommodation space 2 of the melting furnace 1.
  • a current is supplied to the first lead wire 180A and the second lead wire 180B of the first heater 100 by using a power feeding device (not shown in FIG. 3).
  • a power feeding device not shown in FIG. 3
  • the heat generating member 120 is resistance-heated, and the tubular member 130 is heated by this radiation.
  • the molten glass MG is heated by the heat from the tubular member 130.
  • the cooling member 12 has been used in order to suppress the leakage of the molten glass MG (see FIG. 1).
  • the heat generating member 120 has a first heat generating portion 122 and a second heat generating portion 124 along the extending axis direction of the first heater 100. Further, the first heat generating portion 122 is installed in the internal space 110 of the first heater 100 at a position closer to the second heater end portion 102B than the second heating portion 124.
  • the height position of the first heat generating portion 122 of the first heater 100 corresponds to the accommodation space 2 of the melting furnace 1, and the second heat is generated.
  • the height position of the portion 124 can be arranged with respect to the melting furnace 1 so as to correspond to the through hole 10 of the melting furnace 1. That is, the first heater 100 can be installed in the melting furnace 1 so that the first heat generating portion 122 enters the accommodation space 2 and the second heating portion 124 faces the through hole 10.
  • the relationship of the above equation (1) is established between the first heat generating unit 122 and the second heat generating unit 124. Therefore, the first heat generating portion 122 can provide more heat toward the tubular member 130 as compared with the second heat generating portion 124.
  • the tubular member 130 can provide more heat energy toward the outside at the position corresponding to the first heat generating portion 122, while the tubular member 130 can provide more heat energy to the outside at the position corresponding to the second heat generating portion 124. It is possible to suppress the amount of heat provided toward. As a result, the temperature of the gap 17 can be significantly suppressed as compared with the accommodation space 2.
  • the molten glass MG that moves from the accommodation space 2 through the gap 17 is solidified in the middle of the process, so that the gap 17 can be sealed with the glass layer.
  • the first heater 100 when used, it is possible to significantly increase the heating efficiency when manufacturing the molten glass.
  • the temperature of the bottom 5 of the melting furnace 1 may become too high, and erosion of the members of the bottom 5 may be promoted.
  • the temperature of the second heat generating portion 124 does not become as high as that of the first heat generating portion 122. Therefore, in the first heater 100, the erosion of the bottom 5 of the melting furnace 1 can be significantly suppressed.
  • the outer shape of the first heater 100 is not particularly limited.
  • the first heater 100 may have, for example, a substantially columnar or substantially prismatic form.
  • the cross section of the first heater 100 perpendicular to the extension axis direction may be a substantially circular shape, a substantially elliptical shape, a substantially triangular shape, a substantially quadrangular shape (including a trapezium), or another polygonal shape.
  • the cross section of the first heater 100 is substantially circular.
  • the internal space 110 in which the heat generating member 120 is housed preferably has a low oxygen partial pressure during use of the first heater 100.
  • the internal space 110 may be filled with a non-oxidizing gas such as a reducing gas and / or an inert gas.
  • a non-oxidizing gas such as a reducing gas and / or an inert gas.
  • Hydrogen can be used as the reducing gas, and one or more selected from argon, helium, neon, krypton, xenon, radon, and nitrogen can be used as the inert gas.
  • the internal space 110 may be adjusted to have a substantially atmospheric pressure in the state of use of the first heater 100.
  • the lid member 170 may be provided with one or more ports communicated with the internal space 110. Through these ports, the internal space 110 can be filled with gas, and the gas can be exhausted from the internal space 110.
  • the configuration of the lid member 170 is not particularly limited as long as the environment of the internal space 110 can be properly maintained. Therefore, the description of the lid member 170 will be omitted here.
  • the heat generating member 120 has a first heat generating portion 122 and a second heat generating portion 124. Both the first heat generating portion 122 and the second heat generating portion 124 can be made of a material containing carbon (C).
  • the material containing carbon (C) includes, for example, graphite and a carbon fiber reinforced carbon composite material (Carbon Fiber Reinforced Carbon Composite: CC composite).
  • Such a carbon material has a feature that it is hardly deformed even at a high temperature of 2000 ° C or higher. Therefore, by configuring the heat generating member 120 with a material containing carbon, the problem that the heat generating member 120 is deformed by its own weight during use of the first heater 100 can be significantly suppressed.
  • the first heater 100 can be used in the "vertical orientation" as shown in FIG.
  • the first heat generating unit 122 and the second heat generating unit 124 are configured to satisfy the above-mentioned equation (1).
  • the second heat generating portion 124 may have a different material and / or a different shape from the first heat generating portion 122.
  • the shape of the first heat generating portion 122 is not particularly limited.
  • the first heat generating portion 122 may have, for example, a circular tube shape having a periodic slit as shown in FIG.
  • the first heat generating portion 122 may be coil-shaped, rod-shaped (non-hollow), plate-shaped, tubular (hollow), or the like.
  • FIG. 4 shows an example of a three-dimensional view of the heat generating member 120.
  • the first heat generating portion 122 has a configuration in which a plurality of slits are provided in a hollow substantially cylindrical conductor along the extension axis direction of the first heater 100. Each slit is provided alternately from a first direction (for example, the upper side in FIG. 4) and a second direction opposite to the first direction (for example, the lower side in FIG. 4).
  • the shape of the second heat generating portion 124 is not particularly limited.
  • the second heat generating portion 124 is provided with a small number of slits (two in FIG. 4) along the extension axis direction of the first heater 100 in a tubular (hollow) shape as shown in FIG. It may have a shape.
  • the second heat generating portion 124 may have a coil shape, a rod shape (non-hollow), a plate shape, or the like. Further, when the first heat generating portion 122 and the second heat generating portion 124 have a cylindrical shape having a spirally periodic slit, the first heat generating portion 122 and the second heat generating portion 124 are provided at different cycles. It may have a slit. Alternatively, when the first heat generating portion 122 and the second heat generating portion 124 have a cylindrical shape having a plurality of slits along the extension axis direction of the first heater 100, as shown in FIG. 4, the first heat generating portion The 122 and the second heat generating portion 124 may have slits having different cycles. Alternatively, the shapes of the first heat generating portion 122 and the second heat generating portion 124 may be different.
  • both the first heat generating portion 122 and the second heat generating portion 124 may be configured in a coil shape.
  • the number of turns and / or the thickness of the coil may be changed between the coil-shaped first heat generating portion 122 and the coil-shaped second heat generating portion 124 so as to satisfy the above-mentioned equation (1).
  • the first heat generating portion 122 is composed of the CC composite having the first carbon content (C1)
  • the second heat generating portion 124 is composed of the CC having the second carbon content (C2). It may be composed of a composite.
  • the first heat generating portion 122 is composed of a CC composite having a first porosity (P1)
  • the second heat generating portion 124 is formed of a second porous portion. It may be composed of CC composite of degree (porosity) (P2).
  • the resistance X ( ⁇ / m) in the first heat generating portion 122 and the resistance Y in the second heating portion 124 ( ⁇ / m) satisfies (1/30) X ⁇ Y.
  • the relationship between the two is preferably (1/20) X ⁇ Y, and more preferably (1/10) X ⁇ Y.
  • the resistance X ( ⁇ / m) and the resistance Y ( ⁇ / m) satisfy Y ⁇ (1/2) X in order to suppress erosion of the bottom of the furnace.
  • the relationship between the two is preferably Y ⁇ (1/3) X, and more preferably Y ⁇ (1/4) X.
  • the temperature of the first heat generating portion 122 during use of the first heater 100 varies depending on the type of glass to be melted, but is, for example, in the range of 800 ° C. to 2000 ° C.
  • the temperature of the first heat generating portion 122 may be in the range of 900 ° C. to 1800 ° C.
  • the temperature of the second heat generating portion 124 during use of the first heater 100 is 100 ° C. or more lower than the temperature of the first heat generating portion 122.
  • the temperature of the second heat generating portion 124 is preferably 200 ° C. or more lower than the temperature of the first heat generating portion 122, and preferably 300 ° C. or more lower.
  • the tubular member 130 is made of a tubular metal having one end sealed.
  • the tubular member 130 may be made of, for example, a material containing one or more selected from platinum, tungsten, iridium, rhodium, and molybdenum.
  • some heat-resistant metals such as molybdenum and tungsten have significantly reduced oxidation resistance in a predetermined temperature range.
  • molybdenum has a significantly reduced oxidation resistance in a temperature range of about 400 ° C. or higher
  • tungsten has a significantly reduced oxidation resistance in a temperature range of about 500 ° C. or higher.
  • this "dangerous" temperature region corresponds approximately to the temperature region in which the portion of the tubular member of the glass melting heater facing the side wall 11 of the bottom 5 of the melting furnace 1 is exposed.
  • the gap 17 between the side wall 11 of the bottom 5 of the melting furnace 1 and the first heater 100 is formed by solidifying the molten glass MG and the molten glass MG. It is sealed with a glass layer.
  • the portion of the tubular member 130 facing the side wall 11 is covered with a glass layer, and contact with the atmosphere is suppressed.
  • the molten glass MG does not immediately harden when it enters the gap 17 due to heating by the second heat generating portion 124, but enters the depth of the gap 17 and enters the lower surface of the bottom 5 of the melting furnace 1.
  • the tubular member 130 can be sealed with a glass layer up to the vicinity of 9.
  • the second portion 15 of the cooling member 12 when the second portion 15 of the cooling member 12 is provided around the tubular member 130, the second portion 15 can be installed at a position far from the accommodation space 2. This makes it possible to sufficiently prevent oxidation of the tubular member 130 and prevent a decrease in the temperature of the molten glass MG in the accommodation space 2.
  • the tubular member 130 even if a metal containing molybdenum and tungsten is used as the tubular member 130, oxidation in the portion facing the side wall 11 can be significantly suppressed.
  • the open end of the tubular member 130 has a shape such that it is flanged and connected to the lid member 170, for example, a brim portion 139 as shown in FIG.
  • a brim portion 139 as shown in FIG.
  • An O-ring made of heat-resistant rubber or a metallic gasket may be installed between the brim portion 139 and the lid member 170.
  • the first lead wire 180A and the second lead wire 180B are made of a conductive material.
  • Z1 is the first heat generating portion 122. It is less than 1/30 of the resistance X per unit length of.
  • Z2 is the first heat generating portion 122. It is less than 1/30 of the resistance X per unit length of.
  • the maximum temperature of the first lead wire 180A and the second lead wire 180B is 400 ° C. or less even when the first heater 100 is in use.
  • the first insulating member 175A is made of an insulating material. Further, the first insulating member 175A also needs a sealing function for properly sealing the gap between the first opening 172A of the lid member 170 and the first lead wire 180A.
  • Insulating members having such a sealing function are well known to those skilled in the art.
  • first insulating member 175A and the second insulating member 175B shown in FIG. 1 is merely an example. It will be apparent to those skilled in the art that these configurations are not particularly limited as long as the first lead wire 180A and the second lead wire 180B can be properly taken out to the outside.
  • the heater according to one embodiment of the present invention may have other configurations.
  • the heat generating member is not limited to two, and may have three or more heat generating parts.
  • various changes are possible.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Resistance Heating (AREA)
PCT/JP2020/046033 2019-12-20 2020-12-10 ガラス溶解用のヒータ Ceased WO2021125040A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP20903796.9A EP4080990B1 (en) 2019-12-20 2020-12-10 Heater for melting glass
CN202080086267.0A CN114788407A (zh) 2019-12-20 2020-12-10 玻璃熔解用的加热器
JP2021565529A JP7618933B2 (ja) 2019-12-20 2020-12-10 ガラス溶解用のヒータ
US17/840,263 US12356511B2 (en) 2019-12-20 2022-06-14 Heater for melting glass

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-230938 2019-12-20
JP2019230938 2019-12-20

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/840,263 Continuation US12356511B2 (en) 2019-12-20 2022-06-14 Heater for melting glass

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WO2021125040A1 true WO2021125040A1 (ja) 2021-06-24

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EP (1) EP4080990B1 (https=)
JP (1) JP7618933B2 (https=)
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WO (1) WO2021125040A1 (https=)

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CN116715418B (zh) * 2023-05-18 2026-03-31 彩虹（合肥）液晶玻璃有限公司 一种基板玻璃熔解炉加热器双缸自推进机构

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JP2018193268A (ja) 2017-05-16 2018-12-06 日本電気硝子株式会社 ガラス物品の製造方法及び生地漏れ検出装置

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FR2600855B1 (fr) * 1986-06-26 1988-08-05 Electricite De France Dispositif de chauffage electrique comportant une gaine metallique
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JP2004193130A (ja) * 2002-12-11 2004-07-08 Heraeus Noblelight Gmbh 赤外輻射器
JP2017030987A (ja) * 2015-07-29 2017-02-09 旭硝子株式会社 溶融ガラス加熱装置、ガラス製造装置、およびガラス物品の製造方法
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US20220312554A1 (en) 2022-09-29
US12356511B2 (en) 2025-07-08
EP4080990A1 (en) 2022-10-26
CN114788407A (zh) 2022-07-22
EP4080990A4 (en) 2024-01-17
EP4080990B1 (en) 2025-02-26
JPWO2021125040A1 (https=) 2021-06-24
JP7618933B2 (ja) 2025-01-22

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