EP2488459A1 - Glass furnace having controlled secondary recirculation of the glass - Google Patents
Glass furnace having controlled secondary recirculation of the glassInfo
- Publication number
- EP2488459A1 EP2488459A1 EP10773151A EP10773151A EP2488459A1 EP 2488459 A1 EP2488459 A1 EP 2488459A1 EP 10773151 A EP10773151 A EP 10773151A EP 10773151 A EP10773151 A EP 10773151A EP 2488459 A1 EP2488459 A1 EP 2488459A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glass
- recirculation
- oven according
- adjusting
- bath
- 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.)
- Withdrawn
Links
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
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/18—Stirring devices; Homogenisation
- C03B5/182—Stirring devices; Homogenisation by moving the molten glass along fixed elements, e.g. deflectors, weirs, baffle plates
Definitions
- the invention relates to improvements made to the control of the flow of glass in a glass furnace, a furnace of the type comprising:
- a restriction of width in particular a corset, determining a downstream part and an upstream part in the tank,
- the secondary recirculation loop is in opposition to the primary recirculation loop located on the side of the charging of raw materials in the furnace.
- the invention relates more particularly, but not exclusively, to a furnace for clear or extra-clear glass.
- the secondary recirculation loop also called the secondary belt, creates problems for flat glass manufacturers.
- the recirculation of the glass in this belt increases the corrosion of the refractories of the inner wall of the furnace, in particular the corner blocks of the corset, which leads to a deterioration of the quality of the glass.
- the energy consumption of the oven increases with the flow of the belt.
- the corset a sort of vessel of reduced width relative to the upstream (the furnace) and the downstream (the working pool) parts, aims in particular to reduce the effect of the belt, but the refractory angle blocks located at the entrance of the corset are subject to strong corrosion, harmful to the quality of the glass.
- the flow of recirculated glass is greatly increased.
- the glass is on average warmer. Corrosion is then more important because it increases with the speed of the glass and the temperature.
- the object of the invention is, above all, to improve the control of the flow of the glass in the secondary recirculation loop or belt in order to reduce the corrosion of the refractories, in particular corner blocks, and / or to reduce the energy consumption of the oven while ensuring the quality of the glass.
- an oven of the kind defined above is characterized in that it comprises a means for adjusting the passage width of the glass in the secondary recirculation loop, the adjustment means being immersed in the bath and extending vertically on part of the depth of the bath.
- a cross dam perpendicular to the flow of the glass, is commonly implanted in the corset. Its main function is to retain the impurities on the surface of the bath but also influences the flow of the glass, in particular by braking the recirculation go of the secondary recirculation loop. It is installed vertically so as to partially dive into the bath at a reduced depth.
- the adjustment means according to the invention is located upstream of the dam in the direction of flow of the drawn.
- the immersed portion of the adjustment means extends, from the surface, to a bath depth corresponding to the drawn and at least a part of the recirculation go, without reaching the recirculation return, so to limit the corrosion at the corner blocks and curb the recirculation go.
- the distance between the lower edge of the adjustment means and the hearth is greater than the distance between the hearth and the separation line between the recirculation go and the recirculation return.
- the submerged portion extends about one-third of the depth of the bath, from the surface. This configuration is particularly interesting for operation of the furnace without dam. In the case where a dam is present in the corset, this configuration also makes it possible to limit the corrosion of the refractory at the dam.
- the immersed portion of the adjustment means extends over a greater bath depth corresponding to the drawn, the recirculation go and at least a part of the recirculation back.
- the distance between the lower edge of the adjusting means and the sole is less than the distance between the sole and the line of separation between the recirculation go and the recirculation return.
- the submerged portion extends over at least two thirds of the depth of the bath, from the surface. This configuration makes it possible to limit corrosion at the corner blocks and to slow down the forward and return currents of the recirculation loop.
- the submerged portion of the adjusting means is constituted, from the surface, of a connecting element without significant action on the movement of the glass, and, in the lower part, of a flat element influencing the flow of the glass.
- This configuration is advantageously used to brake the return current of the recirculation loop without action at the pull and the forward current.
- the flat element of the adjustment means extends only on the return recirculation, on at least a part of the return recirculation.
- the means for adjusting the passage width of the glass is generally located in the upstream zone of the width restriction, in particular at the upstream entrance of the width restriction or the corset.
- the means for adjusting the passage width of the glass may comprise at least one cooled hollow vertical flat element, in particular with water, immersed permanently in the molten glass bath.
- the hollow flat element is metallic. It may comprise tubes in which the cooling fluid circulates.
- the means for adjusting the passage width of the glass may be cooled only a fraction of its height, on the upper part in contact with the drawn and the recirculation go or the deepest part in contact with the recirculation of return of the secondary recirculation loop.
- the means for adjusting the passage width of the glass comprises at least one vertical plate of refractory material.
- the means for adjusting the passage width of the glass is vertically adjustable; it is maintained by a moving device vertical.
- the means for adjusting the passage width of the glass may be adjustable laterally, in particular by rotation around a vertical axis.
- the adjustment means is constituted by a vertical flat element
- this flat element may be rotatably mounted about a vertical geometric axis located towards the upstream end of the flat element.
- at least one means for adjusting the passage width of the glass is disposed on each side of the furnace, the adjustment means being symmetrical to one another with respect to a median longitudinal vertical plane of the furnace.
- FIG. 1 is a partial longitudinal vertical schematic section at the corset of a flat glass furnace according to the invention
- FIG. 2 is a schematic view from above, with respect to FIG. 1, of the corset and the molten glass bath.
- FIG. 1 and 2 of the accompanying drawing there can be seen a portion of a flat glass furnace having a vault 1 and a sole 2 constituting the bottom of a vessel containing a bath 3 of molten glass.
- the oven comprises a corset 4 of reduced width defining a downstream portion 5 (right in Fig. 1) and an upstream portion 6 (left in Fig.1) in the tank.
- the direction to consider to define the upstream and downstream is that which goes from the inner zone of the furnace located on the left of Fig .1, towards the exit located on the right.
- the side walls of the oven converge in zone 7 (FIG. 2) adjacent to the inlet of the corset and diverge in zone 8 (FIG. 2) facing the outlet (not shown) of the oven, through which the glass is evacuated. in fusion.
- a secondary recirculation loop B of the molten glass is formed between the inner zone of the warmer oven, located on the left of Figs. 1 and 2, and the output being at a lower temperature.
- the liquid glass circulates in this loop in the clockwise direction for the representation of FIG.
- the upper layers of the bath composed of the furnace flow and the recirculation flow towards the outlet, that is to say to the right, according to a forward flow of convection F1 schematized by an arrow, while the lower layers, composed of the recirculation, close to the sole 2, move towards the inner zone, that is to say to the left, according to a return convection current F2 schematized by an arrow.
- An (imaginary) separation line S is between the forward and return currents.
- the loop B passes through the corset 4.
- the convection currents back and forth cause corrosion of the inner refractory wall of the furnace, particularly at the corner blocks G, H at the inlet and the outlet of the brace 4. Corrosion increases when the velocity of the currents convection of the glass in the loop B increases, and conversely decreases when this speed decreases.
- a reduction in the speed of the forward currents F1 and return F2 of the recirculation loop B is created by creating a transverse restriction E (FIG 2) preferably in the entry zone of the brace 4. This restriction transverse allows to control the width of the passage of the glass in the corset 4 and thus to achieve an adaptation to the different colors of glass or production levels of the oven whose corset 4, defined in the design and made of refractory, is not adjustable by definition.
- the transverse restriction E is made with a means M of adjusting the passage width of the glass, in the secondary recirculation loop B, over a part of the height of the bath (Fig. 1).
- the submerged portion of the adjusting means extends differently to the depth of the bath depending on whether one wishes to intervene only on the pull and the recirculation go, only on the return recirculation, or drawn and the currents go and return.
- the distance D (FIG. 1) between the lower edge of the adjustment means M and the hearth 2 is greater than the distance J between the hearth and the separation line S between the recirculation F1 and the recirculation return F2.
- the adjustment means M plunges only in the drawn and the recirculation go F1.
- the distance D (FIG. 1) between the lower edge of the adjustment means M and the hearth 2 is smaller than the distance J between the hearth and the separation line S between the forward recirculation F1 and the recirculation return F2.
- the lower part of the adjustment means M plunges into the return recirculation F2.
- a regulating means M is disposed on each side of the furnace (FIG 2), the adjustment means M being symmetrical to each other with respect to a median longitudinal vertical plane V of the furnace.
- Each adjustment means M advantageously comprises at least one hollow vertical flat element 9, diagrammatically shown in FIG. 1 and 2 by a rectangular contour, cooled with water admitted by an inlet pipe 9a and discharged through an outlet pipe 9b to give heat to the outside.
- the flat element 9 is immersed in the molten glass bath permanently.
- This flat hollow element 9 is preferably metallic. It can be realized with a series of tubes of parallel vertical axes located in the same plane, in which circulates the cooling water. The cooling of the flat element 9 can be achieved over its entire height or only a part of this height.
- the means M for adjusting the passage width of the glass may be made in the form of a vertical plate made of refractory material.
- the introduction of the equipment constituted by the adjusting means M is effected symmetrically in the corset, either by the piers or by the arch.
- Each adjustment means M is maintained by a mechanical system 10 provided to allow the vertical adjustment of the means M in order to adjust this means M with respect to the separation line S of the forward and return currents.
- the means M is constituted by a vertical plate-like flat element 9
- this flat element is rotatably mounted around a vertical geometric axis 1 1 located towards the upstream end of the flat element 9.
- the rotation of the flat element 9 around this axis 1 1 creates an angle with respect to the flow of the glass and ensures the reduction of the width E between the downstream ends 12 of the flat elements 9. This ensures the reduction of the width of the glass passage section for the drawn and the recirculation go, the drawn, the recirculation go and the recirculation return, or only the recirculation return according to the configuration retained.
- the flat element 9 is rotatably mounted about a vertical geometric axis 1 1 located towards the downstream end of the flat element 9; the device comprising means for adjusting the lateral position of the vertical geometric axis 1 1.
- M means width adjustment are preferably placed at the entrance of the brace 4 to ensure the reduction of the glass flow closer to the refractory walls and / or also to reduce the temperature of the glass closer to these same refractories, whose corrosion is thus reduced.
- the corset 4 is also used to rapidly and strongly cool the glass between the upstream melting-refining zone and the downstream working pond.
- a transverse dam 13 perpendicular to the flow of the glass may be provided, consisting of a water-cooled metal cooling device installed vertically so as to plunge to a reduced depth in the molten glass bath 3.
- vertical dam 13 extends along the entire width of the corset 4.
- the glass Upstream of a dam, the glass is laminated on the height of the bath.
- the composition of the glass varies with the strata with, for example, a lower concentration of surface NaO resulting from evaporation.
- the presence of the dam forces the glass to plunge into the bath which breaks the stratification.
- the solution of the invention advantageously replaces a dam in its function of reducing the forward flow of the recirculation loop because it makes it possible to reduce the secondary recirculation of the glass by reducing the cross section in the corset while preserving a sufficient lamination of the glass.
- the solution of the invention also reduces the corrosion of the walls and the consumption of the oven. It is particularly interesting for the production of clear or extra-clear glass.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
- Glass Melting And Manufacturing (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0904925A FR2951156B3 (en) | 2009-10-14 | 2009-10-14 | IMPROVEMENTS IN THE CONTROL OF GLASS CONVECTION IN A GLASS OVEN EQUIPPED WITH A CORSET |
PCT/IB2010/054521 WO2011045713A1 (en) | 2009-10-14 | 2010-10-06 | Glass furnace having controlled secondary recirculation of the glass |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2488459A1 true EP2488459A1 (en) | 2012-08-22 |
Family
ID=43414248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10773151A Withdrawn EP2488459A1 (en) | 2009-10-14 | 2010-10-06 | Glass furnace having controlled secondary recirculation of the glass |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120216578A1 (en) |
EP (1) | EP2488459A1 (en) |
BR (1) | BR112012008512A2 (en) |
FR (1) | FR2951156B3 (en) |
WO (1) | WO2011045713A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10414682B2 (en) | 2014-04-29 | 2019-09-17 | Saint-Gobain Glass France | Process and device for melting and fining glass |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US836731A (en) * | 1906-02-15 | 1906-11-27 | Amsler Engineering Company | Glass-melting furnace. |
US1661836A (en) * | 1926-03-18 | 1928-03-06 | Pittsburgh Plate Glass Co | Glass-melting tank |
US1835690A (en) * | 1927-09-12 | 1931-12-08 | Hazel Atlas Glass Co | Floating bridge wall |
US1960164A (en) * | 1932-11-11 | 1934-05-22 | Corning Glass Works | Cooling bridge walls for glass melting furnaces |
FR1300813A (en) * | 1961-06-21 | 1962-08-10 | Saint Gobain | Further training in tank furnaces for the manufacture of glass or other similar material |
GB1159011A (en) * | 1966-01-06 | 1969-07-23 | Pilkington Brothers Ltd | Improvements in or relating to Apparatus for Stirring High Temperature Liquids. |
BR6898501D0 (en) * | 1967-05-25 | 1973-01-23 | Glaverbel | APPLIANCE FOR THE MANUFACTURE OF GLASS IN SHEET |
DE1596424B1 (en) * | 1967-06-07 | 1970-12-23 | Floatglas Gmbh | Device for homogenizing a glass melt |
US3498779A (en) * | 1967-10-30 | 1970-03-03 | Owens Illinois Inc | Apparatus for melting highly corrosive glass compositions |
BE794781A (en) * | 1972-02-01 | 1973-07-31 | Ppg Industries Inc | HIGH MELTING POINT GLASS SHAPING PROCESS |
GB1503145A (en) * | 1974-04-26 | 1978-03-08 | Pilkington Brothers Ltd | Glass melting |
US4029489A (en) * | 1976-02-17 | 1977-06-14 | Owens-Corning Fiberglas Corporation | Method of and apparatus for melting of glass |
JPS6031774B2 (en) * | 1979-09-04 | 1985-07-24 | セントラル硝子株式会社 | Method of refining molten glass |
US4317669A (en) * | 1980-08-18 | 1982-03-02 | Libbey-Owens-Ford Company | Glass melting furnace having a submerged weir |
US4349376A (en) * | 1981-06-08 | 1982-09-14 | Owens-Corning Fiberglas Corporation | Liquid cooled skimmer |
US5588978A (en) * | 1992-11-24 | 1996-12-31 | Imtec | Process and apparatus for coloring glass |
GB2306467A (en) * | 1995-10-28 | 1997-05-07 | Pilkington Plc | Method and apparatus for making glass |
-
2009
- 2009-10-14 FR FR0904925A patent/FR2951156B3/en not_active Expired - Lifetime
-
2010
- 2010-10-06 BR BR112012008512A patent/BR112012008512A2/en not_active IP Right Cessation
- 2010-10-06 EP EP10773151A patent/EP2488459A1/en not_active Withdrawn
- 2010-10-06 US US13/501,287 patent/US20120216578A1/en not_active Abandoned
- 2010-10-06 WO PCT/IB2010/054521 patent/WO2011045713A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011045713A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2951156A3 (en) | 2011-04-15 |
WO2011045713A1 (en) | 2011-04-21 |
US20120216578A1 (en) | 2012-08-30 |
BR112012008512A2 (en) | 2016-04-05 |
FR2951156B3 (en) | 2011-09-16 |
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Legal Events
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: STROCK, BERTRAND Inventor name: PAHMER, FRANCOIS |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: PAHMER, FRANCOIS Inventor name: STROCK, BERTRAND |
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DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20130731 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
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18W | Application withdrawn |
Effective date: 20151217 |