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CN-122003387-A - Method for repairing glass melting furnaces

CN122003387ACN 122003387 ACN122003387 ACN 122003387ACN-122003387-A

Abstract

The invention relates to a method for repairing an area (30) to be repaired, which extends on a lower surface (29) of a side wall (22, 26) of a housing of a glass melting furnace (10), comprising the steps of a) installing an inner formwork (32) to form a mould (36) around the area to be repaired, the inner formwork comprising flexible textile elements (50) and reinforcing elements (52) intended to reinforce the inner formwork, b) filling the mould with a repair product (41) until a working configuration is reached, wherein in step a) the textile elements are rigidly attached to the furnace, the textile elements being shaped to exert a force (R) on the reinforcing elements in opposition to a thrust (P) exerted on the reinforcing elements by the repair product in the working configuration.

Inventors

  • CONSALES THIERRY
  • Cyril Rino
  • S. Marroth
  • T. Philip

Assignees

  • 圣高拜欧洲实验及研究中心

Dates

Publication Date
20260508
Application Date
20240927
Priority Date
20230927

Claims (20)

  1. 1. A method for repairing a region (30) to be repaired extending over an inner arch (29) of a side wall (22, 26) of a housing of a glass melting furnace (10), the method comprising the steps of: a) Installing an inner form (32) to form a mold (36) around the area to be repaired, the inner form comprising a flexible textile element (50) and a reinforcing element (52) intended to reinforce the inner form; b) Filling the mould with a repair product (41) until a working configuration is reached; in the method, in step a), the textile element is rigidly attached to the furnace, the textile element being shaped so as to exert on the reinforcing element, in the operating configuration, a force (R) opposite to the thrust (P) exerted on the reinforcing element by the repair product.
  2. 2. Method according to the preceding claim, wherein during step a) and step b) the area to be repaired is at a temperature higher than 300 ℃.
  3. 3. The method according to any of the preceding claims, wherein in step a) the textile element is rigidly attached to the outside of the housing of the furnace, preferably on the outer arch of the side walls (22, 26).
  4. 4. Method according to any one of the preceding claims, wherein in step b) a bag defined by the textile element is filled with the repair product, at least a portion of the bag being sealed to the repair product, the portion being sealed to the repair product preferably comprising at least one front face (50 b) of the bag.
  5. 5. Method according to any one of the preceding claims, wherein the textile element defines a bag identical to or different from the bag mentioned in claim 4, said bag comprising a portion permeable to the repair product, preferably comprising at least one rear face (50 a) of the bag, which, in the operating configuration, extends against and in contact with the wall to be repaired.
  6. 6. A method according to any one of the preceding claims, wherein in step a) the reinforcing element is introduced into a bag defined by the textile element, which bag may be the same as or different from the bag mentioned in claims 4 and 5, or is attached to a front face (50 b) of the bag defined by the textile element that is exposed towards the interior of the furnace.
  7. 7. Method according to any one of the two immediately preceding claims, wherein the textile element defines a bag identical to or different from the bag mentioned in claims 4 to 6, the bag being divided into a plurality of compartments defined, and wherein in step a) reinforcing elements, preferably in the form of plates, are introduced into one or more of the compartments, and/or in step b) one or more of the compartments, preferably all of the compartments, are filled with the repair product.
  8. 8. A method according to any one of the preceding claims, wherein the textile element is made of a material selected from ceramics, metals, organic materials and mixtures thereof, preferably made of ceramics.
  9. 9. The method according to any of the preceding claims, wherein the textile element comprises or consists of a knitted fabric.
  10. 10. The method according to the immediately preceding claim, wherein the knitted fabric comprises a repetition of elementary units, at least some of which are at least partially closed by at least one line called sealing line, elementary units being defined as a smallest rectangular pattern by which the elementary units repeatedly form 70% or more of the surface of the knitted fabric.
  11. 11. The method according to the immediately preceding claim, wherein, -More than 30% on average of the total surface area of the base unit is enclosed by the at least one sealing line, and/or More than 40%, preferably more than 90% by number of the basic units are at least partially enclosed by a sealing line, preferably by a set of sealing lines, which together enclose more than 30% of the total surface area of the at least partially enclosed basic units, and/or -More than 30% by number of the basic units are at least partially enclosed by a sealing line, preferably by a set of sealing lines, which together enclose more than 50%, preferably more than 70% of the total surface area of the at least partially enclosed basic units, and/or By number, more than 90% of the basic cells are at least partially enclosed by a sealing line, preferably by a set of sealing lines, which together enclose more than 70% of the total surface area of the at least partially enclosed basic cells, and/or The knitted fabric is made of a material selected from the group consisting of ceramics, metals, organic materials and mixtures thereof, preferably ceramics, and/or The repetition of the basic unit enables more than 85%, preferably more than 97%, of the surface of the knitted fabric to be covered, and/or -Ceramic knits making up more than 5% and less than 25% of the mass of the textile element, and/or The sealing lines are oriented parallel to each other, and/or The sealing lines, preferably each sealing line, are made of a material selected from the group consisting of ceramics, organic products and mixtures thereof, preferably made of ceramics.
  12. 12. The method according to the immediately preceding claim, wherein, The knitted fabric comprises, preferably consists of, and/or comprises knitting threads comprising more than 95% by mass of oxide The sealing lines, preferably each sealing line, contain more than 95% by mass of oxides.
  13. 13. A method according to any one of the preceding claims, wherein the reinforcing element is made of a ceramic matrix composite material, the textile element is made of ceramic, and the entire inner formwork (32 i) is preferably made of ceramic.
  14. 14. A method according to any one of the preceding claims, wherein the stiffening element has the shape of a plate, grid, frame or bar.
  15. 15. A method according to any one of the preceding claims, wherein in step a) the reinforcing element is detachably attached to the textile element.
  16. 16. A method according to any one of the preceding claims, wherein the reinforcing element is attached to the textile element so as to adopt a predetermined position in the working configuration.
  17. 17. The method according to any of the preceding claims, comprising a step 5) of sintering the repair product introduced into the mould in step b) after step b), the obtained sintered repair product consisting of a plurality of components, the content of any component of the sintered repair product being greater than 5%, -The content of any component of the sintered repair product differs from the content of the component in the reinforcing element by less than 20%, and/or -The content of any component of the sintered repair product differs from the content of the component in the region of the furnace delimiting the region to be repaired by less than 20%, and/or The content of any component of the sintered repair product differs from the content of the component in the textile element by less than 20%, The content is in weight percent based on the oxide.
  18. 18. The method according to any of the preceding claims, wherein the internal template (32 i) is discarded in the area to be repaired after the repair.
  19. 19. A method according to any one of the preceding claims, wherein the stiffening element: Made of ceramic matrix composite material, and/or -Comprising through holes and/or grooves arranged to be filled with the repair product during step b), and/or -Having the shape of a flat or non-flat plate, said plate having a thickness greater than 3 mm and less than 50: 50 mm, preferably to form the bottom of the bag defined by said textile element, and/or -Is detachable.
  20. 20. A method according to any one of the preceding claims, wherein the internal template comprises an accessory for holding the stiffening element in the working configuration, the accessory being made of a ceramic matrix composite material, the ceramic matrix composite material of the accessory being the same as or different from the ceramic matrix composite material of the stiffening element when the stiffening element is made of the same ceramic matrix composite material.

Description

Method for repairing glass melting furnaces Technical Field The present invention relates to a method for repairing a glass melting furnace. The invention also relates to a template (formwork) for performing the method. Background Fig. 1 schematically illustrates a half cross section of a glass melting furnace 10. The trough 12, the metal structure 14 and the superstructure 16 can be seen in particular. The trough 12 for containing molten glass includes vertical side walls 22 and a floor 24. The side walls 22 typically comprise side cell blocks that extend the full height of the cell to an upper edge 25. The floor of the sump defines a substantially horizontal bottom of the sump, and substantially vertical side walls surround the bottom. The term "superstructure" 16 of a glass melting furnace is generally used to denote the part of the furnace that covers the trough and encloses the enclosure. The superstructure 16 typically comprises bricks with noses (if present), walls and arches. The superstructure 16 is not in contact with the molten glass. The superstructure 16 generally comprises at its base an intermediate layer 18, side walls 26 and a dome 28, the superstructure 16 resting on the metal structure through the intermediate layer 18, the side walls 26 resting on the intermediate layer. In the gas furnace, burners (not shown) are arranged in the side walls 26. The intermediate layer 18 includes a nose piece 20 ("gap brick"), preferably consisting of a nose piece 20 ("gap brick"). The trough and superstructure together form a furnace enclosure. In the remainder of the specification, unless otherwise indicated, the term "sidewall" refers to the sidewall 22 of the tank and/or the sidewall 26 of the superstructure. The side walls define an inner surface of the shell, or "inner arch" 29, and a surface opposite the inner arch, called "outer arch" 31. The side walls typically include not only refractory bricks defining an intrados, but also insulators and/or cladding and/or metallic infrastructure surrounding the assembly of bricks. The "interior" of the furnace is defined by an inner dome 29. Molten glass, steam and condensate are highly corrosive. The refractory component is severely eroded. The refractory components used are generally in the form of blocks or slabs, either melted and cast or obtained by sintering. Their choice depends on their placement to withstand the local stresses and to give the furnace a satisfactory service life. Guidelines for selection also include failure to create defects that render the glass unusable, which can reduce production yields. To increase the service life of the furnace, repairs are required by the glass manufacturer. Repair can be performed after discharging the glass and cooling the furnace. The person may then enter the furnace for repair. Alternatively, the repair may be a "hot" repair, preferably performed at a temperature above 300 ℃, in which case a person cannot enter the furnace for repair. Repair involves filling the empty space created by the erosion of the furnace with repair product, that is, fixing the repair product in the area initially occupied by the refractory material that disappears by the erosion. This area is called the "area to be repaired". The area 30 to be repaired may be due to, inter alia, pinning of the sidewall 22 of the sump and/or the sidewall 26 of the superstructure. In order to repair the sidewall, it is necessary to hold the repair product against gravity flow. This problem does not generally occur for the repair of the backplane. The area to be repaired sometimes penetrates the furnace housing, allowing the interior and exterior of the furnace to be in fluid communication. Such a penetration area to be repaired can in particular lead to leakage of molten glass in the trough. These leaks are dangerous and can lead to furnace downtime. For repairing hot melts, as shown in EP 0739 861, templates are typically manufactured to make a mold from one or more refractory parts that is capable of holding the repair product before it hardens. The area to be repaired is then defined in part by one or more refractory components of the furnace and in part by the template. The template has a portion within the furnace where pinning occurs. The template may also include a portion on the exterior of the furnace to prevent repair product from escaping to the exterior of the furnace when the pinning results in a passageway through the furnace housing. The outer portion of the form is typically a sheet (veneer). For clarity, the terms "inner template" and "outer template" refer to the portions of the template that are inside and outside the furnace, respectively. Fig. 2 shows an example of a conventional internal template 32 i. The form includes 3 adjacent panels 35 1、352 and 35 3 that are held in place by metal clamps 39, wedge blocks 43 and cooling tubes 45. "Thermal" repair is repair conducted at temperatures typically greater than 300 ℃. Thus, the