WO2018211975A1 - Procédé de production d'articles en verre et four de fusion - Google Patents

Procédé de production d'articles en verre et four de fusion Download PDF

Info

Publication number
WO2018211975A1
WO2018211975A1 PCT/JP2018/017418 JP2018017418W WO2018211975A1 WO 2018211975 A1 WO2018211975 A1 WO 2018211975A1 JP 2018017418 W JP2018017418 W JP 2018017418W WO 2018211975 A1 WO2018211975 A1 WO 2018211975A1
Authority
WO
WIPO (PCT)
Prior art keywords
bottom wall
electrode
cooling
heat insulating
layer
Prior art date
Application number
PCT/JP2018/017418
Other languages
English (en)
Japanese (ja)
Inventor
昌樹 藤原
一教 川▲崎▼
Original Assignee
日本電気硝子株式会社
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 日本電気硝子株式会社 filed Critical 日本電気硝子株式会社
Publication of WO2018211975A1 publication Critical patent/WO2018211975A1/fr

Links

Images

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
    • C03B5/027—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
    • C03B5/03—Tank furnaces

Definitions

  • the present invention relates to a method for manufacturing a glass article and a melting furnace.
  • the method for producing glass articles such as plate glass includes a melting step for obtaining molten glass.
  • the molten glass may be heated by energization heating of an electrode that penetrates the bottom wall portion of the melting furnace and reaches the inside of the furnace.
  • the electrode used for current heating is attached to the bottom wall portion of the melting furnace while being inserted and held on the inner peripheral surface of the cylindrical electrode holder, as disclosed in Patent Document 1.
  • a passage for flowing a coolant such as water is provided inside the electrode holder, and the electrode is cooled by the coolant flowing through the passage, thereby reducing the deterioration of the electrode.
  • the bottom wall part in contact with the molten glass is also heated.
  • the electric resistance is lowered, which causes a spark between the electrode and the refractory brick during energization heating.
  • the bottom wall portion is easily melted, and in some cases, a serious trouble may occur that the molten glass leaks out of the furnace. Therefore, it is necessary to cool the bottom wall portion so that it is not excessively heated.
  • Patent Document 1 since a large gap is formed between the outer peripheral surface of the electrode holder and the bottom wall portion, it is not assumed at all that the refractory brick is cooled by the electrode holder.
  • the bottom wall may be cooled more than necessary unless the cooling method is devised, and the heating efficiency in the furnace may deteriorate.
  • Such deterioration of the heating efficiency in the furnace leads to an increase in the manufacturing cost of the glass article, so it is ideal to eliminate it as much as possible.
  • An object of the present invention is to appropriately cool the bottom wall portion of a melting furnace with an electrode holder while suppressing deterioration of heating efficiency in the melting furnace.
  • the present invention devised to solve the above problems includes an electrode that passes through the bottom wall portion in the vertical direction and energizes and heats the molten glass in the furnace, an inner peripheral surface that holds the electrode, and a bottom wall portion.
  • the electrode holder includes a cooling layer in which a coolant flows, and a cooling layer And a heat insulating layer arranged on the outer diameter side of the inside.
  • the electrode holder since the electrode holder includes the cooling layer on the inner diameter side (electrode side) and the heat insulating layer on the outer diameter side (bottom wall side), the bottom wall is excessively formed by the cooling layer. It can be prevented by the heat insulating layer.
  • the outer peripheral surface of the electrode holder since the outer peripheral surface of the electrode holder is in close contact with the bottom wall portion of the melting furnace at a position above the heat insulating layer, the upper portion of the bottom wall portion inside the furnace is partially not affected by the heat insulating layer. It becomes easy to be cooled. Therefore, it is possible to appropriately cool the upper portion of the bottom wall portion where sparks are likely to occur during energization while suppressing the entire bottom wall portion from being excessively cooled and deteriorating the heating efficiency in the melting furnace.
  • the electrode holder includes an auxiliary cooling unit having a cooling layer and a heat insulating layer, and a main cooling unit having a solid structure that is disposed above the auxiliary cooling unit and does not have the cooling layer and the heat insulating layer.
  • the main cooling unit may be cooled by the auxiliary cooling unit. If it does in this way, the upper part of a bottom wall part will be cooled by the main cooling part. Since the main cooling part has a solid structure that does not have a cooling layer and a heat insulating layer, even if the upper part (tip) of the main cooling part is worn out due to melting damage or the like, the refrigerant flows through the cooling layer of the auxiliary cooling part. Will not leak into the furnace immediately. In other words, since the wear of the main cooling part can be allowed to some extent, the service life of the electrode holder can be extended.
  • the electrode holder includes an auxiliary cooling part and a main cooling part
  • the upper end of the heat insulating layer is located at the same height as the upper end of the cooling layer. In this way, it becomes easy to ensure the vertical dimension of the main cooling part. Therefore, it becomes easier to enjoy the above effects such as cooling the upper portion of the bottom wall portion by the main cooling portion and extending the useful life of the electrode holder.
  • the electrode holder includes the auxiliary cooling part and the main cooling part, it is preferable that the lower end of the heat insulating layer is located below the lower end of the cooling layer. If it does in this way, it can suppress reliably that the lower part of the bottom wall part outside a furnace is unnecessarily cooled by the auxiliary cooling part.
  • the heat insulating layer is preferably an air layer. In this way, a high heat insulation effect can be realized with a simple structure.
  • the present invention devised to solve the above problems includes an electrode that passes through the bottom wall portion in the vertical direction and energizes and heats the molten glass in the furnace, an inner peripheral surface that holds the electrode, and a bottom wall portion.
  • a cylindrical electrode holder having an outer peripheral surface held by the electrode holder, wherein the electrode holder includes therein a cooling layer through which a refrigerant flows and a heat insulating layer disposed on the outer diameter side of the cooling layer. It is characterized by having. According to such a structure, the same effect as the corresponding structure mentioned above can be enjoyed.
  • the bottom wall portion of the melting furnace can be appropriately cooled by the electrode holder while suppressing the deterioration of the heating efficiency in the melting furnace.
  • FIG. 4 is a cross-sectional view taken along line AA in FIG. 3.
  • the manufacturing apparatus of the glass article used for this manufacturing method is the melting furnace 1, the clarification chamber 2, the homogenization chamber (stirring chamber) 3, the pot 4, and a shaping
  • the apparatus 5 is provided with these parts 1 to 5 connected by transfer pipes 6 to 9.
  • the terms “chamber” and “pot” such as the clarification chamber 2 include those having a tank-like structure and those having a tubular structure.
  • the melting furnace 1 is a space for performing a melting step for obtaining the molten glass Gm.
  • the clarification chamber 2 is a space for performing a clarification process in which the molten glass Gm supplied from the melting furnace 1 is clarified (defoamed) by the action of a clarifier or the like.
  • the homogenization chamber 3 is a space for performing a homogenization process in which the clarified molten glass Gm is agitated by the agitating blade 3a and homogenized.
  • the pot 4 is a space for performing a state adjustment process for adjusting the molten glass Gm to a state suitable for molding (for example, viscosity).
  • the pot 4 may be omitted.
  • the forming device 5 is for performing a forming step of forming the molten glass Gm into a desired shape.
  • molds the molten glass Gm in plate shape with the overflow downdraw method, and manufactures the glass plate as a glass article.
  • the forming device 5 has a substantially wedge shape in cross-sectional shape (cross-sectional shape orthogonal to the paper surface), and an overflow groove (not shown) is formed in the upper portion of the forming device 5.
  • an overflow groove (not shown) is formed in the upper portion of the forming device 5.
  • the formed plate glass has, for example, a thickness of 0.01 to 10 mm (preferably 0.1 to 3 mm), a flat panel display such as a liquid crystal display or an organic EL display, a substrate such as an organic EL illumination or a solar cell, Used for protective cover.
  • molding apparatus 5 may perform other down draw methods, such as a slot down draw method and a redraw method, and a float method.
  • the transfer tubes 6 to 9 are made of, for example, cylindrical tubes made of platinum or a platinum alloy, and transfer the molten glass Gm in the horizontal direction (substantially horizontal direction).
  • the transfer pipes 6 to 9 are energized and heated as necessary.
  • the melting furnace 1 is an electric melting furnace in which a glass raw material (which may include cullet) Gr is melted to form a molten glass Gm by heating including energization heating.
  • the melting furnace 1 is composed of refractory bricks (for example, zirconia electrocast brick, alumina electrocast brick, alumina / zirconia electrocast brick, AZS (Al-Zr-Si) electrocast brick, dense fired brick, etc.)
  • the melted space in the furnace is defined by the wall portion formed.
  • the bottom wall 1a of the melting furnace 1 is provided with a plurality of electrodes 10 so as to be immersed in the molten glass Gm for electric heating. No other heating means other than the electrode 10 is provided in the melting furnace 1, and the glass material Gr is melted (all electric melting) only by energization heating (electric energy) of the electrode 10.
  • the electrode 10 is made of, for example, rod-shaped molybdenum (Mo).
  • the melting furnace 1 is not limited to all electric melting, and may be one that melts the glass raw material Gr by using both gas combustion and electric heating. When gas combustion and electric heating are used in combination, a plurality of gas burners are provided at the top of the melting furnace 1.
  • the melting furnace 1 is a single melter having only one melting space for the glass raw material Gr, but may be a multimelter in which a plurality of melting spaces are connected.
  • the melting furnace 1 is provided with a screw feeder 11 as a raw material supply means.
  • the screw feeder 11 sequentially supplies the glass raw material Gr so that a part not covered with the glass raw material (solid raw material) Gr is formed on a part of the liquid level Gm1 of the molten glass Gm. That is, the melting furnace 1 is a so-called semi-hot top type.
  • the melting furnace 1 may be a so-called cold top type in which the entire liquid level Gm1 of the molten glass Gm is covered with the glass raw material Gr.
  • the raw material supply means may be a vibration feeder or the like.
  • the melting furnace 1 is provided with a flue 12 as a gas discharge path for discharging the gas in the melting furnace 1 to the outside.
  • a fan 12a for sending gas to the outside is provided in the flue 12.
  • the fan 12a may not be installed.
  • the gas in the melting furnace 1 is air, it is not limited to this.
  • the electrode 10 provided on the bottom wall portion 1a of the melting furnace 1 penetrates the bottom wall portion 1a along the vertical direction and reaches the inside of the furnace.
  • “along the up-down direction” means to include a case where it is slightly inclined from the vertical direction.
  • the outer peripheral surface 10 a of the electrode 10 is held by the inner peripheral surface 14 a of the cylindrical electrode holder 14.
  • the outer peripheral surface 14b of the electrode holder 14 is held by the inner peripheral surface 13a of the holding hole 13 provided in the bottom wall portion 1a in a state of being in close contact with the bottom wall portion 1a of the melting furnace 1 in the entire vertical direction.
  • the upper end surface 14c of the electrode holder 14 is in contact with the molten glass Gm in the molten state in the furnace.
  • the electrode holder 14 is formed of a metal such as an iron material (for example, stainless steel), for example.
  • the electrode holder 14 includes an auxiliary cooling unit 15 provided on the lower side (furnace outer side) and a main cooling unit 16 provided on the upper side (furnace inner side).
  • the main cooling unit 16 is cooled by the auxiliary cooling unit 15. Is done.
  • the auxiliary cooling unit 15 includes therein a cooling layer 17 through which a coolant such as water flows, and a heat insulating layer 18 disposed on the outer diameter side of the cooling layer 17.
  • a coolant such as water flows
  • a heat insulating layer 18 disposed on the outer diameter side of the cooling layer 17.
  • the cooling layer 17 and the heat insulating layer 18 have an internal space.
  • the cooling space 17 is filled with a coolant such as water.
  • the refrigerant is supplied to the cooling layer 17 through a supply pipe (not shown) and discharged from the cooling layer 17 through a discharge pipe (not shown).
  • the cooling effect of the cooling layer 17 is exhibited by such supply and discharge of the refrigerant.
  • the refrigerant may be a gas such as air instead of a liquid such as water, or may be a mixture containing the liquid in the gas.
  • the internal space of the heat insulation layer 18 is a hollow and an air layer. With such an air layer, the heat insulating effect of the heat insulating layer 18 is exhibited.
  • the internal space of the heat insulating layer 18 may communicate with the outside of the furnace at the lower end of the heat insulating layer 18. Further, a heat insulating material such as glass wool or ceramic wool may be disposed in the internal space of the heat insulating layer 18.
  • the upper end 18a of the heat insulating layer 18 is located at the same height as the upper end 17a of the cooling layer 17. Further, the lower end 18 b of the heat insulating layer 18 is positioned below the lower end 17 b of the cooling layer 17.
  • the positional relationship in the vertical direction between the heat insulating layer 18 and the cooling layer 17 is not limited to this and can be adjusted as appropriate.
  • the main cooling unit 16 has a solid structure without the cooling layer 17 and the heat insulating layer 18. That is, the main cooling unit 16 does not have an internal space.
  • the vertical dimension L1 of the main cooling section 16 is preferably 50% or less, and preferably 40% or less of the vertical dimension L2 of the electrode holder 14. Is more preferable. Further, from the viewpoint of improving the service life of the electrode holder, the vertical dimension L1 of the main cooling part 16 is preferably 20% or more of the vertical dimension L2 of the electrode holder 14.
  • this manufacturing method includes a melting step, a clarification step, a homogenization step, a state adjustment step, and a molding step.
  • molding process are as having demonstrated together with the structure of the above-mentioned manufacturing apparatus, below, a melting process is explained in full detail.
  • the glass material Gr and the molten glass Gm are energized and heated by the electrode 10 held by the electrode holder 14.
  • the electrode 10 is cooled by the cooling layer 17 of the auxiliary cooling unit 15 and the main cooling unit 16 cooled by the cooling layer 17. Therefore, heat conduction from the portion immersed in the molten glass Gm in the electrode 10 to the remaining portion can be reduced, and the remaining portion of the electrode 10 can be maintained at a low temperature (for example, less than 600 ° C.). For this reason, wear of the electrode 10 due to molybdenum sublimation or the like can be prevented.
  • the heat insulating layer 18 prevents the bottom wall part 1 a from being excessively cooled by the cooling layer 17. be able to.
  • the outer peripheral surface 14b of the electrode holder 14 is in close contact with the bottom wall 1a of the melting furnace 1 at a position above the heat insulating layer 18, the upper part of the bottom wall 1a inside the furnace is It becomes easy to be partially cooled without being affected. Accordingly, it is possible to appropriately cool the upper portion of the bottom wall portion 1a that is likely to generate a spark when energized, while suppressing the entire bottom wall portion 1a from being excessively cooled and deteriorating the heating efficiency in the melting furnace 1. .
  • this invention is not limited to the structure of the said embodiment, It is not limited to the above-mentioned effect.
  • the present invention can be variously modified without departing from the gist of the present invention.
  • the outer peripheral surface 14b of the electrode holder 14 is in close contact with the bottom wall portion 1a of the melting furnace 1 in the entire vertical direction, but is not limited thereto.
  • the region of the main cooling portion 16 in the outer peripheral surface 14 b of the electrode holder 14 may be in close contact with the bottom wall portion 1 a of the melting furnace 1.
  • assistant cooling part 15 may contact
  • the glass article formed by the forming apparatus 5 is a plate glass
  • the present invention is not limited to this.
  • the glass article molded by the molding apparatus 5 may be, for example, an optical glass component, a glass tube, a glass block, a glass fiber, or the like, or may have an arbitrary shape.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Melting And Manufacturing (AREA)

Abstract

L'invention concerne un procédé de production d'articles en verre comprenant une étape de fusion pour former un verre fondu Gm dans un four de fusion (1) qui est pourvu : d'une électrode (10) qui pénètre verticalement à travers une section de paroi inférieure (1a) et chauffe électriquement le verre fondu Gm dans le four ; et d'un support d'électrode cylindrique (14) possédant une surface périphérique interne (14a) dans laquelle l'électrode (10) est insérée et maintenue, et une surface périphérique externe (14b) qui est en contact étroit avec la section de paroi inférieure (1a). Le support d'électrode (14) intègre une couche de refroidissement (17) à travers laquelle s'écoule un fluide frigorigène, et une couche d'isolation thermique (18) qui est disposée radialement à l'extérieur de la couche de refroidissement (17).
PCT/JP2018/017418 2017-05-16 2018-05-01 Procédé de production d'articles en verre et four de fusion WO2018211975A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017097285A JP6792825B2 (ja) 2017-05-16 2017-05-16 ガラス物品の製造方法及び溶融炉
JP2017-097285 2017-05-16

Publications (1)

Publication Number Publication Date
WO2018211975A1 true WO2018211975A1 (fr) 2018-11-22

Family

ID=64274305

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/017418 WO2018211975A1 (fr) 2017-05-16 2018-05-01 Procédé de production d'articles en verre et four de fusion

Country Status (2)

Country Link
JP (1) JP6792825B2 (fr)
WO (1) WO2018211975A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113874329A (zh) * 2019-07-03 2021-12-31 日本电气硝子株式会社 玻璃物品的制造方法及玻璃物品的制造装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2024047915A (ja) 2022-09-27 2024-04-08 Ａｇｃ株式会社 ガラス溶解装置、およびガラス製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5396056U (fr) * 1976-06-23 1978-08-04
JP2007119299A (ja) * 2005-10-28 2007-05-17 Nippon Electric Glass Co Ltd ガラス溶融用電極

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5396056U (fr) * 1976-06-23 1978-08-04
JP2007119299A (ja) * 2005-10-28 2007-05-17 Nippon Electric Glass Co Ltd ガラス溶融用電極

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113874329A (zh) * 2019-07-03 2021-12-31 日本电气硝子株式会社 玻璃物品的制造方法及玻璃物品的制造装置
CN113874329B (zh) * 2019-07-03 2024-02-02 日本电气硝子株式会社 玻璃物品的制造方法及玻璃物品的制造装置

Also Published As

Publication number Publication date
JP2018193269A (ja) 2018-12-06
JP6792825B2 (ja) 2020-12-02

Similar Documents

Publication Publication Date Title
KR101653408B1 (ko) 유리 제조 장치 및 제조 방법
CN103153884B (zh) 玻璃板的制造方法及玻璃板制造装置
WO2019230277A1 (fr) Procédé de fabrication d'un article en verre
JP2018193268A (ja) ガラス物品の製造方法及び生地漏れ検出装置
JP7025720B2 (ja) ガラス物品の製造方法及びガラス溶融炉
KR101971755B1 (ko) 용융 유리 제조 장치, 용융 유리 제조 방법 및 그것들을 사용한 판유리의 제조 방법
US11530152B2 (en) Method for manufacturing glass article, and melting furnace
WO2018211975A1 (fr) Procédé de production d'articles en verre et four de fusion
JP2007131525A (ja) 平坦ガラス、特にガラスセラミックになり易いフロートガラスの製造方法
JP7174360B2 (ja) ガラス物品の製造方法、溶解炉及びガラス物品の製造装置
JP5824433B2 (ja) ガラス板の製造方法、および、ガラス板の製造装置
TW201922633A (zh) 玻璃熔解爐、及玻璃物品之製造方法
JP7090844B2 (ja) ガラス物品の製造方法及びガラス基板群
JP6115466B2 (ja) フロート板ガラスの製造方法
US20220298048A1 (en) Apparatus for transferring molten glass, apparatus for producing glass article, and method for producing glass article
JP2020050545A (ja) ガラス溶解炉、及びガラス溶解方法
JP5981570B2 (ja) ガラス基板の製造方法
JP6721311B2 (ja) ガラス基板の製造方法
GB2475303A (en) A method and apparatus for melting material
KR100790788B1 (ko) 연속식 유리 용융로
AU2023211869A1 (en) Electric glass furnace, methods for the melting and manufacture of glass by means of said furnace
CN118302391A (zh) 玻璃移送装置、玻璃物品的制造装置以及玻璃物品的制造方法
JP2016069241A (ja) ガラス基板の製造方法、および、ガラス基板の製造装置
JP2015124111A (ja) ガラス基板の製造方法、およびガラス基板製造方法
KR20060112086A (ko) 전기용융로용 전극조립체

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18802289

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18802289

Country of ref document: EP

Kind code of ref document: A1