TW201111312A - Molten glass manufacturing device, molten glass manufacturing method, and sheet glass manufacturing method using the device and the method - Google Patents

Abstract

Provided are a molten glass manufacturing device and a molten glass manufacturing method which are suitable for manufacturing high-quality non-alkali glass, and a sheet glass manufacturing method using the device and the method. A molten glass manufacturing device for manufacturing molten glass which has a viscosity (η) of 102 (dPa.S) at a temperature (Tη) in the range of 1500 - 1760 DEG C, the molten glass manufacturing device being provided with a melting vessel, the melting vessel being provided with second bubblers and first bubblers provided upstream of the second bubblers. In the molten glass manufacturing device, if the length of the molten glass flow path of the melting vessel is LF, the distance from the upstream end of the molten glass flow path to the row of the first bubblers is in the range of 0.4 LF - 0.5 LF, the distance from the downstream end of the molten glass flow path to the row of the second bubblers is in the range of 0.45 LF - 0.55 LF, the distance (LP) between the row of the first bubblers and the row of the second bubblers is in the range of 500 - 1000 mm, the distance (LB1) between the row of the first bubblers and the burner closest to the row on the upstream side of the row is in the range of 0 - 2000 mm, the distance (LB2) between the row of the second bubblers and the burner closest to the row on the downstream side of the row is in the range of 800 - 2500 mm, and LB2 > LB1.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten glass manufacturing apparatus, a method of manufacturing a molten glass, and a method of manufacturing the flat glass using the same. More specifically, the present invention relates to a method for producing a molten glass for producing high-quality alkali-free glass having high homogeneity, a method for producing a molten glass, and a method for producing the flat glass using the same. [Prior Art] A glass substrate for a flat panel display (FPD) using an alkali-free glass substantially free of alkali metal ions is preferable for improving the insulating properties of the glass substrate. Further, the alkali-free glass is preferably used for the production of a glass substrate for FPD because the coefficient of thermal expansion is small. In the production of a glass substrate for FPD, it is required to produce a glass substrate having a higher quality, that is, a homogenization quality. Therefore, the glass raw material is clarified, and the smelting glass (refining furnace) of the smelting glass is continuously subjected to various designs to improve the homogeneity of the molten glass. In the melting furnace disclosed in Patent Document 1, the melting furnace is divided into an upstream region and a downstream region by a diaphragm, and a circulating flow of the molten glass (upstream side circulation and downstream side circulation) is formed in each region, thereby melting the raw material. And the melting glass is negatively divided. More specifically, the melting of the glass raw material is carried out by the formation of the upstream side circulation in the upstream region, and the homogenization of the molten glass is performed by the formation of the downstream side circulation in the downstream region. In the melter furnace disclosed in Patent Document 1, 'the upstream side circulation and the downstream side circulation are controlled, and the bubbler is provided on the upstream side of the horizontal partition. 15004] .doc 201111312 The melting furnace (melting tank) disclosed in Patent Document 2 does not have a structure corresponding to the diaphragm of the melting furnace disclosed in Patent Document 1, but discloses the use of at least one row of bubblers and at least two of each other. The opposite burner, the situation in which the glass is melted and purified. CITATION LIST Patent Literature Patent Literature 1: Japanese Patent Application Laid-Open No. Hei 9-124323 (Patent Document No. Hei. The melting furnace is not necessarily suitable for the production of high quality non-test glass. In the index of the melting temperature of the glass, Τη, that is, the glass viscosity η reaches a temperature of 102 [dPa.S], but the % of the alkali-free glass is ι5〇〇~1760C 'Compared with ordinary lime glass (SO(ja) Lime glass) is more difficult to homogenize than 含η, which is higher than 100 °C, and therefore it is not possible to use a melting furnace of a general mass production such as soda lime glass disclosed in Patent Documents 1 and 2. It is not necessarily suitable for the production of a glass-filled product (such as a glass substrate for FpD) which is particularly strict in terms of homogeneity. Further, as described above, the Τη due to the alkali-free glass is higher than the alkali-containing glass such as soda lime glass. The temperature of the glazed glass in the melting furnace is also inevitably increased. If the temperature of the molten glass is higher, the corresponding effect of the molten glass on the structure inside the furnace is enhanced. Therefore, in the case of alkali-free glass, if it is a patent The transverse partition in the melting furnace disclosed in Document 1 or the melting furnace disclosed in Patent Document 2 is 150041.doc 201111312. There is a step in the bottom of the melting furnace that affects the flow of molten glass. The problem of the erosion gradient of the molten glass and the resulting impurities. Moreover, in the case of alkali-free glass, the temperature of the molten glass in the melting furnace is inevitably increased, and therefore, if the downstream area is long as in the patent document The structure, or a large-scale melting furnace as in Patent Document 2, the range in which the burner is heated is increased, which is disadvantageous to energy efficiency. Moreover, the melting of the glass is also known, and impurities are generated therefrom, or The problem of the change of the flow rate of the molten glass. In order to solve the problems of the prior art mentioned above, it is an object of the present invention to provide a molten glass manufacturing apparatus, a method for manufacturing a molten glass, and a method thereof, which are suitable for producing a homogeneous quality glass having no homogeneity. The method for manufacturing flat glass The technical means for solving the problem In order to achieve the above-mentioned purpose and the result of the research, the inventors of the present invention found that in order to produce a high-quality, high-quality enamel-free glass, it is necessary to melt the glass raw material. The flow rate of the upstream side circulation in the tank and the flow rate of the downstream side circulation are controlled in a manner of mutual relationship. - The present invention Based on the above findings of the inventors of the present application, a molten glass manufacturing apparatus is provided, which is characterized in that it is used to produce a glass viscosity η of 102 [dPa.S] and a temperature of 15 〇. 〇~176〇. The molten glass of the ' ' 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该a first bubbler and a plurality of second bubblers, wherein the first bubbler is disposed upstream of the molten glass flow path than the second bubbler, and the melting tank includes heating for the melting a burner in the upper space of the tank, and when the length of the molten glass flow path of the melting tank is U, the distance from the upstream end of the molten glass flow path to the third bubbler is 0.4LF ~〇.5LF, the distance from the downstream end of the molten glass flow path to the second bubbler is 〇45Lf~〇55Lf, and the distance between the first isolator row and the second bubbler row] ^ is 5〇〇~1〇〇〇mm The distance between the first bubbler row in the direction of the flow path of the molten glass in the melting tank and the burner closest to the upstream side of the row is 〇~2〇〇〇mm, and the (four) glass in the refining tank The distance between the second bubbler row in the flow path direction and the burner closest to the downstream side of the row is Lb^_~25〇〇mm, and LB2>LB1. Moreover, the present invention provides a method for producing a molten glass by using the above-described molten glass manufacturing apparatus to produce a molten glass, and setting an average flow rate of the gas supplied from the correction foamer to % [liter/min], The average flow rate of the gas supplied from the second bubbler is set to [[liters per minute], and the ambient gas temperature above the first bubbler is set to T rc], and the environment above the second bubbler is set. When the gas temperature is hrc], the molten glass is produced under the condition of Vi > V2, τ 1 > T2. Further, the present invention provides a method for producing a molten glass seed glass of the present invention, which is obtained by forming a molten glass obtained by the above manufacturing method into a flat plate 150041.doc 201111312 glass. Advantageous Effects of Invention The molten glass manufacturing apparatus and the molten glass manufacturing method of the present invention are suitable for producing a high-quality non-glass having high homogeneity. The flat glass manufacturing method of the present invention can produce a flat glass having high homogeneity and transparency, and is therefore suitable for producing a substrate for FpD. [Embodiment] Hereinafter, the present invention will be described with reference to the drawings. As described above, Τη is used as an indicator of the melting temperature of glass. The glass system Τη of the present invention is 1500 to 1760. (:, it is higher than l〇〇»C or more than the alkali-containing glass such as ordinary soda lime glass, so that it is difficult to homogenize the molten glass. The molten glass manufacturing apparatus and the molten glass manufacturing method of the present invention are suitable. Further, as a specific example of the glass having a Τ 1500 to 1760 eC, an alkali-free glass is particularly suitable. According to this aspect, the molten glass manufacturing apparatus and the molten glass manufacturing method of the present invention are suitable for specific A quantity (20 to 100 tons/day) produces a glass product which is strict in quality as a glass substrate for FPD. Fig. 1 is a cross-sectional view showing an embodiment of a melting tank in the molten glass manufacturing apparatus of the present invention, and Fig. 2 is a diagram A plan view of the melting tank shown in Fig. 1. In order to facilitate understanding, the upper wall surface of the melting tank 10 is omitted. The glass material inlet port π is provided at the upstream end of the refining tank 10. The glass raw material is melted into molten glass G by heating by the burner 15, and is held in the melting tank 1〇. It is disposed at the end of the downstream side of the melting tank 1〇150041.doc 201111312. There is a discharge port 12 for discharging the molten glass G to the next step. The discharge port 12 is in communication with the conduit 20 on the downstream side. In the vicinity of the bottom surface of the melting tank 1〇 shown in Figs. The bubbler 13 and the plurality of second bubblers 14. The plurality of first bubblers 13 and the plurality of second bubblers 14 are arranged in the width direction of the melting tank 10, more specifically, in the melting The first glass bubbler 13 is disposed in the flow path of the smelting glass in the width direction of the molten glass flow path of the groove 1 by a predetermined interval (pitch). On the upstream side, a specific interval is provided between the first bubbler 13 row and the second bubbler 14 row. Further, for each of the first bubbler 13 and the second bubbler 14 in the row direction The preferred range of the distance between the bubblers and the distance between the third bubbler 13 row and the second bubbler 14 row will be described later. On both sides of the melting tank 1 shown in Figs. The burner 15 is disposed in such a manner that the molten glass G held in the melting tank 10 is located above. The burner 15 is external to the following example. In addition, the melting tank 1 in the molten glass manufacturing apparatus of the present invention is provided by the i-th bubbler 13, the second bubbler 14 and The burner 15 is disposed in a specific manner as follows, and it is not necessary to provide a stepped structure which affects the flow of the molten glass as disclosed in Patent Documents 2 and 2 at the bottom of the molten glass flow path, thereby promoting the molten glass in the melting tank. The circulation of G (the upstream side circulation stream, the downstream side circulation stream 101) is formed, and the flow rate of the upstream side circulation 1〇〇 can be controlled to have a specific relationship with the flow rate of the downstream side circulation 10 1 150041.doc 201111312 The melting tank 10 in the molten glass manufacturing apparatus is suitable for the production of Τ 1500 to 1760 because the bottom of the molten glass flow path does not have a stepped structure in which the erosion of the molten glass is a problem. (The glass of the molten glass manufacturing apparatus of the present invention is the length of the molten glass flow path of the melting tank 10 from the upstream end of the molten glass flow path to the first The distance of the bubbler 13 is 〇4Lf~〇5Lf, and the distance from the downstream end of the molten glass flow path to the second bubbler 14 is 〇.45Lf~〇.55Lf. Therefore, with the patent document, 2, the length of the melting tank 10 is shorter than that of the prior melting tank (melting furnace), and the length of the portion of the melting tank that forms the downstream side circulation is also short. The molten glass flow path of the melting tank 10 of the invention The length is different depending on the width of the molten glass ice path, but is preferably 10 to 30 m, more preferably 10 to 25 m' and further preferably 15 to 22 m. On the other hand, the molten glass flow path The width is preferably 5 to 1 μm, more preferably 5·5 to 9 m, and still more preferably 65 to 8 m. The melting tank in the molten glass manufacturing apparatus of the present invention is obtained by using two bubblers u The flow rate of the gases 16 and 17 with the second bubbler 14 is set to the following relationship, and the burner 15 is set to the following. The configuration is to reduce the per-unit time two of the glazed glass flow (downstream side circulation (8)) in the two= domain, thereby controlling the specific relationship between the flow rate of the upstream side circulation and the downstream side circulation. In the "measurement on the surface of the 1st battle", it can suppress the progress of the heterogeneous layer (scum layer) with a lighter specific gravity in the unrefined material in the glass raw material or the volatilization of the smelting glass. J50041.doc 201111312 (Direct By the homogenization of the smelting glass by the downstream region, high-quality molten glass having high homogeneity can be obtained. Further, in the gas 16 supplied from the first bubbler and the second bubbler 14, It is preferable to use a gas which does not adversely affect the constituent elements of the molten glass G and the melting tanks 10 and 14 such as the bubblers 13. As a specific example of such a gas, air, nitrogen, oxygen, helium, argon or the like is exemplified. In the case where a turning or turning alloy is used as the material of the bubblers 13, 14, the gas, 16, 17 supplied by the bubbler η, the bubbler 14 is preferably 'containing oxygen without using I, helium and argon. The gas, especially among these, is nitrogen. The distance from the upstream end of the middle molten glass flow path to the second bubbler 13 is preferably 〇43Lf to 〇46Lp, and the downstream end of the molten glass flow path to the second bubbler 14 is stopped from '47LF to 〇_54LF. The distance from the molten glass flow path is preferably in the dissolution tank 1〇, and when the distance between the first bubbler 13 row and the second bubbler 14 is LP, 'Lpb(9) to mm. In the range, the effect of promoting the circulation of the upstream side circulation 1〇〇 and the downstream side circulation in the dissolution tank 1G is excellent, and the flow rate of the upstream side circulation 1〇〇 and the downstream side circulation 101 are controlled. A particular relationship is therefore preferred. If the LP is less than 500 mm, the third row of the second bubbler is too close to the second bubbler, and the circulation of the molten glass g in the melting tank 1 is upstream (upstream side circulation 100, downstream) The effect of the formation of the side circulation 1〇1) is insufficient and it is difficult to control the upstream side circulation i. The flow rate has a specific relationship with the flow rate of the downstream side circulation iq ι. 150041.doc 201111312 When Lp exceeds 丨_mm, Dijon bubbler i3 line fish number 2

The distance between the rows of the bubblers 14 is too wide, and the effect of promoting the formation of the MU swim side circulation (10) and the downstream side circulation (8) of the molten glass G of the refining tank is insufficient to control the flow velocity of the upstream side circulation. The flow rate of the downstream side circulation 1 〇1 reaches a specific relationship. In the melting tank 10, Lp is preferably 6 〇〇 to 8 〇〇 mm. In the first bubbler 13 and the second bubbler 14, the distance between the respective bubblers in the direction of the bubbler, that is, the width direction of the molten glass flow path of the melting tank 1〇 The distance between the bubblers is preferably 400 to 700 ugly. When the distance p between the bubblers is within the above range, the effect of promoting the circulation of the molten glass G in the cooling tank 10 (the upstream side circulation 1〇〇 and the downstream side circulation U) is excellent. It is preferable to control the flow rate of the upstream side circulation (10) and the flow rate of the downstream side circulation 1G1, and is preferable in terms of manufacturing cost. If the distance P between the bubblers exceeds 7 mm, In particular, since the distance between the bubblers is too wide, the effect of promoting the formation of the circulating flow of the molten glass G (the upstream side circulation and the downstream side circulation 101) of the dissolution tank is insufficient, and there is a possibility. In the width direction of the molten glass flow path, the formation of the circulating flow of the molten glass G (the upstream side circulation flow 100 and the downstream side nuclear flow 101) is promoted to be different due to the difference in the position, so that the flow velocity of the circulation flow is uneven, so that In the homogenization of the molten glass G, it is less preferable. Further, it is difficult to control the flow rate of the upstream side circulation 100 and the flow velocity of the downstream side turbulence 101 to a specific relationship. The distance P between the bubblers is less than 400 mm. I5004I.doc 201111312 also does not contribute to the formation of the circulation of the molten glass G in the melting tank 10 (the upstream side circulation 100, the downstream side circulation 101), but the cost comparison effect In view of the above, the number of the i-th and second bubblers 14 disposed in the melting tank 10 becomes excessive, which leads to an increase in the manufacturing cost of the molten glass, which is not preferable. The flow path of the molten glass in the melting tank 10 is obtained. When the direction is the axis, the second bubbler 13 and the second bubbler 14 are preferably arranged in different axes. In the melting tank 10 shown in Fig. 2, the protruding end of the first bubbler 13 is The protruding opening of the second foaming benefit 14 is arranged in a zigzag manner, and the protruding opening of the first bubbler 13 and the protruding opening of the second bubbler 14 are not coaxial. When the configuration is performed in this manner 'Even if one of the protruding ports of the first bubbler 13 does not function, it may be arranged in a zigzag manner on the protruding end of the second bubbler 14 on the downstream side without damaging the splicing groove. The formation of the circulating flow of the molten glass G in the κ (the upstream side circulation 100 and the downstream side circulation 101) The effect is that the flow rate of the upstream side circulation (10) can be controlled to have a specific relationship with the flow rate of the downstream side circulation 101. The two sides of the melting tank 1〇 shown in Figs. 1 and 2 are throughout the length of the melting tank 1〇. The burner 15 is disposed at equal intervals in the direction. The burner 15 is not disposed above the second bubbler 14. As will be described in detail hereinafter, the present invention provides the second bubbler. The average flow rate of the gas 17 is less than that of the i-th bubbler " supplied: the average machine in the corpse is v〆 control 〇, and the soil above the second bubbler 见 is the gas temperature junction·I 4· 'Environmental gas temperature above the bubbler 13 is 15040I.doc

-12·201111312 T1 (Control 2), by which the flow rate per unit time of the downstream side circulation 101 can be reduced, thereby controlling the flow rate of the upstream side circulation 1〇〇 to the specific relationship of the downstream side circulation 1〇1. . As a result, when the tempered glass having a Tn of 1500 to 1760 °C is produced, the homogenization of the molten glass can be promoted, and a high-quality molten glass having high homogeneity can be obtained. In order to realize the above control 2, as shown in Fig. 2, it is necessary to arrange the second bubbler 14 row and the burner 15 closest to the downstream side of the row to some extent. Therefore, it is necessary to make LB2 = 800 mm or more. Wherein, if the second bubbler 14 row is excessively separated from the burner 15 closest to the downstream side of the row, the ambient gas temperature above the second bubbler 14 is excessively lowered, and the molten glass is homogenized. When the temperature of the molten glass G discharged from the discharge port 12 at the downstream end of the melting tank 1 is lowered, the temperature of the molten glass G discharged from the discharge port 12 at the downstream end of the melting tank 1 is lowered, and when decompression and defoaming are performed in the subsequent step, It creates problems such as difficulty in defoaming. Therefore, it is necessary to make Lb2 = 2500 m m. \J\ 〇 Therefore, LB2 = 800~2500 mm. Further, it is preferably [^2 = 1 〇〇〇 ~ 2 〇〇〇 mm or more preferably Lb2 = 1000 1600 mm. In addition, in the above-mentioned control 2, in the melting tank 1〇 shown in FIG. 2, the first bubbler 13 in the flow direction of the molten glass in the melting direction is the closest to the upstream side of the row. The distance Lbi of the burner 15 and the distance LB2 between the second bubbler 14 row and the burner 15 closest to the downstream side of the row are formed in a relationship of Lb2 > Lbi. That is, 'Yu! A burner Η is disposed above the bubbler 13, and the burner 丨5 is not disposed above the bubbler 14 of the second. The melting tank 10 of FIG. 2 can be configured such that the ambient gas temperature T2 of the 15041.doc -13-201111312 on the second bubbler is lower than the environment above the first bubbler. Gas temperature τ,. In the present invention, Lb2_Lb43〇〇 mm is preferable, and Lb2 LBQ50〇mm' is more preferable. Hawthorn (four) 〇 _. On the other hand, the melting tank 1 shown in Fig. 2 is attached to the top of the third bubbler 13 row. Further, the combustion state 15 is placed. However, as long as the relationship is satisfied, the burners 13 and the burners 15 closest to the upstream side of the row can be disposed to some extent. In the crucible, if the first bubbler 13 row is excessively separated from the burner 15 closest to the upstream side of the row, the ambient gas temperature above the third bubbler 13 is excessively lowered, and the upstream side circulation 1 is caused. When the enthalpy is weakened, the conversion of the glass raw material is insufficient, and the homogenization of the molten glass G in the downstream region of the smear tank 1 is insufficient. Therefore, it is necessary to make 1^1=2000 mm or less. therefore

Lb1 = 〇~2000 mm. Further, it is preferably LB 丨 = 500 to 1500 mm. Moreover, the distance between the adjacent burners 15 depends on the type of the burner 丨5 or the layout of the melting tank ίο, but is preferably 600 to 26 〇〇mm, more preferably 800 to 2400 mm. The combustion system can mix the fuel with oxygen for combustion' or combine the fuel with oxygen and air for combustion. The molten glass can be made to contain moisture by using these methods. In the step of transporting the molten glass from the melting tank 1 to the downstream side conduit 20, in the case where the foam in the molten glass is removed by decompression under reduced pressure, the molten glass contains moisture preferably, and thus preferably Said burning. 150041.doc. 14. S. 201111312 The constitutive material of the portion of the melting tank 10 that is in contact with the molten glass G is required to have excellent heat resistance and corrosion resistance to molten glass, so that a refractory brick containing Zr 〇 2 is used. In the portion of the bottom surface of the melting tank 1 of the molten glass flow path from the first bubbler 13 to the upstream side, it is preferable to use Zr〇2 in mass%. 85% or more and 97% or less and the remaining part is a glassy hot-melt refractory mainly composed of Si〇2. The reason for this is that the temperature of the molten glass flowing in the refining tank 10 is higher on the upstream side than on the downstream side, and the flow rate from the first bubbler crucible 3 is larger than the flow from the second bubbler 14, so that the refractory brick Easily eroded. In this case, the thickness of each of the hot-melt Worms refractories is preferably from ～20 mm, and preferably from 2 to 3 hot-melt refractories. Further, on the outer side of the layer of the hot-melt refractory thus formed, 2 to 5 layers of other refractory bricks containing Zr〇2 may be laminated, preferably

The thermal fusion of the above composition constitutes all parts of the dissolution tank 1 which are in contact with the glazed glass G. Further, each of the refractory bricks may be laminated with a filler such as alumina 鍅 质. If the cooling means such as air cooling or water cooling for cooling the fire resistant brick is provided on the outer side of the refractory brick at the bottom of the melting tank 10, the life of the refractory brick can be improved, which is preferable. Next, a method of producing a molten glass of the present invention will be described. The method for producing a molten glass of the present invention is to carry out the above-described control, on the one hand, to produce molten glass on the one hand. By reducing the flow rate of each of the downstream side loops 1〇1 by performing the above-described controls 1, 2, the flow rate of the upstream side loop stream 100 and the flow rate of the downstream side loop stream 1 〇 1 are controlled to achieve the following specific relationship. 150041.doc S- •15.201111312: The method for manufacturing the molten glass of the present invention t, the above % comparison: her '吏佳 is 0.7~5 liters, minutes, and more preferably 〇9~2 liters/knife clock' For κ8~2.6 liters/min. Also, the last ^ minutes' is better. · ... liters / minute, and then = 〇 · 5 ~ 2 liters / minute, especially good 〇 9 ~ 2 〇 liters / minute. Further, it is preferably Vl_Vg of 0.2 liters/minute, more preferably liters "minutes and further preferably V] (10) liters/minute; and 4: VAi.o liters/minute. Where the residence is V" In the method for producing a smelting glass of the present invention, the above τ (10) ~ mot:, more preferably touches ~ 695te, and is ic7n 1 / ς〇Λ〇 ^ on the pass 2 is preferably ~ 1690 C, more preferably from 1580 to 1675 ° C. Also, Τι-Τ2 is preferably 10 to 35. 〇, Τι_ is better for 19~ grasping. Qiao 5 3〇C 'and then' Ding and Ding 2 series can The measurement was carried out by the following method: (measurement position) D1: The burner was closer to the upstream side than the first bubbler row, and the middle position of the burner closer to the upstream side than the combustion benefit. Τ2 · 2nd The bubble line is in the middle of the burner closer to the downstream side than the bubbler. ° (Measurement method) The observation window is provided on the side of the splicing tank, and a radiation thermometer (radlatl〇n thermometer) is used (for example, cmN〇IR-AH3SU (measured wave ε 1 ·〇)) measured & the side of the opposite side, the temperature of the inner wall of the dissolution tank. 150041.doc

-16- 201111312 The molten glass manufacturing method of the present invention is characterized in that the average flow velocity of the upstream side circulation is set to F1 [m/hr], and the average flow velocity of the downstream side circulation 1〇1 is set to F2 [m/hr]. Preferably, the control is performed in such a manner that Fi=5~2〇m/hr and f2=〇5~7^/1ΐΓ. Therefore, in the case of manufacturing and melting glass of 15 〇〇 to 176 (rc, the homogenization of the molten glass can be promoted, and a still-quality molten glass having higher homogeneity can be obtained. More preferably, it is 丨=8~ Control is carried out in a manner of 15 m/hr and F2 = 1 to 4 m/hr. Further, the 6 and F2 systems can be measured by the following methods.

Fi. The distance from the upstream end of the molten glass flow path is 〇.3〇L, which is 34Lf, and is near the center in the width direction of the fused glass flow path. F2. The distance from the downstream end of the molten glass flow path is 〇22"~〇 and the vicinity of the center in the width direction of the molten glass flow path. (Measurement method) Video shooting of the foam flow on the surface of the molten glass is carried out. The moving time with respect to the moving distance of the foam is used as the flow rate. This sequence is repeated 2 to 3 times to determine the average flow rate. Next, the method for producing the flat glass of the present invention will be described. The molten glass obtained by the method for producing a molten glass of the present invention is formed into a flat glass. As a method of forming the molten glass into a flat glass, various forming methods such as a float method and a down-draw method can be used. The dicing is 1500 to 176 (rCi glass) In the case of the flat glass manufacturing method of the present invention, the smelting glass obtained by the above-described 15041.doc • 17-201111312 smelting glass manufacturing method of the present invention is formed into a flat glass. Previously, the molten glass foam can also be eliminated by vacuum defoaming. The method for manufacturing the flat glass of the present invention will be The glass having a high homogeneity obtained by the method for producing a molten glass of the invention is formed into a flat glass, so that a flat glass having high homogeneity and high transparency can be obtained. The flat glass continuous manufacturing apparatus of the present invention can be applied to various types of manufacturing. Flat glass for use, but flat glass having high homogeneity and high transparency is particularly suitable for use in the production of flat glass which is extremely strict in homogeneity, such as a glass substrate for FPD. The input port of the melting tank 10 shown in Figs. 1 and 2 is put into a glass raw material in such a manner as to achieve a desired composition, and an alkali-free glass of '1500 to 176 Å. 〇. The melting tank shown in Figs. 1 and 2 is produced. The size of each part is as follows. Length of molten glass flow path Lf: 16 to 25 m Width of flow path of molten glass: 5.5 to 9 m Distance from the upstream end of the molten glass flow path to the behavior of the third bubbler 13 .43Lp—〇.46Lp Distance from the downstream end of the molten glass flow path to the second bubbler 14: 〇.47Lf~〇.54Lf The first bubbler 13 rows and the second bubbler 14 Distance Lp: 6〇〇~8〇〇mm bubbler trip The distance between each of the bubblers 丨3, 14 in the direction is: p〇〇4〇〇~7 mm The first bubbler 13 row in the direction of the molten glass flow path in the melting tank and the burner closest to the upstream side of the 4 rows Distance from 15: 5〇〇~i5〇〇mm 150041.doc 201111312 The second bubbler 14 in the direction of the flow path of the molten glass in the solution tank and the burner closest to the downstream side of the line! Lb2 : 〇〇〇 2 〜 2 (9) 〇 mm Lb2-Lbi ^ 500 mm The distance between the burners in the direction of the flow path of the molten glass in the melting tank: 800 to 2400 mm with the average flow rate from the first bubbler 13 Vi and the average flow rate V2 of the second bubbler 14 are adjusted as follows. V! : 1.8~2.6 liters/min V2: 0.9~2.0 liters/min vi-V2g〇.6 liters/min by the burner 15 in the sputum, while the sputum, && The ring gas temperature T丨 above the bubbler 13 and the % rolling body temperature T2 above the second bubbler j 4 are maintained under the following conditions. Furthermore, ΤI and τ are measured by the above method in the case of T. Τ2 I and butyl 2. τ · 1590~1710. .

1580 ~ 1675 〇C Ti-T2 : l〇~35°C

Fi = 8 to 15 m / hr F2 = 1 ~ 4 m / hr and the manufacturing Τ is 1S00 to 1760. (: and homogenization is carried out by the above conditions, the two quality non-alkali glass is more than 150041.doc -19. 5 201111312 The invention is described in detail, and the description has been made 'but the operator knows that as long as it does not deviate from this aspect Various changes or amendments can be made. The application is based on the Japanese patent application filed on the 24th of September 2009, the application for the case of 2009-219347. The availability of the glazed glass manufacturing apparatus and the molten glass manufacturing method of the present invention is suitable for producing a high-quality alkali-free glass having high homogeneity. Moreover, the flat glass manufacturing method of the present invention can produce homogeneity. Fig. 1 is a cross-sectional view showing an embodiment of a melting tank in a molten glass manufacturing apparatus of the present invention; and Fig. 2 is a flat glass having a high transparency and a high transparency. Fig. 1 is a plan view of the melting tank 1〇, in which the upper wall surface of the melting tank 10 is omitted. [Main component symbol description] 10 Melting tank 11 inlet 12 discharge port 13 brother 1 The second bubbler 14 bubbles 15 from the gas burner 16 of the first bubbler 150041.doc 201111312

17 20 100 101 G Lbi, Lf P Gas from the second bubbler downstream of the conduit upstream side circulation downstream side circulation molten glass

Lb2 ' Lp distance length spacing 150041.doc -21 ·

Claims (1)

201111312 VII. Patent application scope: 1. A molten glass manufacturing device, which is characterized in that it is used for manufacturing a molten glass having a glass viscosity η of l〇2 [dPa.S] and a temperature of 1500 to 1760 °C. The glazing glass manufacturing apparatus includes a melting tank for melting the glass raw material, and includes a plurality of second bubblers and a plurality of second bubblers in a width direction of the molten glass flow path in the vicinity of a bottom surface of the melting tank, The first bubbler is disposed on the upstream side of the molten glass flow path than the second bubbler, and the dissolution tank includes a burner for heating the upper space of the refining tank, and the melting tank is When the length of the molten glass flow path is set to ^, the distance from the upstream end of the molten glass flow path to the first bubbler lamp is 〇.4LF to 〇.5LF, from the downstream end of the molten glass flow path The distance from the second bubbler to the above-mentioned second bubbler is 〇.45LF~〇.55LF, and the distance Lp between the first bubbler row and the second bubbler row is 500~1〇〇〇mm, the above melting The flow path of the molten glass in the tank The distance between the first bubbler row and the burner closest to the upstream side of the row is "丨~2_mm, and the second bubbler row in the flow direction of the molten glass in the melting tank is The distance of the burner closest to the downstream side of the row is 800 to 2500 mm ' and LB2 > LB1. 2_ The molten glass manufacturing apparatus of claim 1 wherein the first bubbler and the second bubbler are The distance between the respective bubblers in the direction of the bubbler 150041.doc 201111312 is 400 to 700 mm. 3. The molten glass manufacturing apparatus according to claim 1 or 2, wherein the molten glass in the melting tank is When the direction of the flow path is the axis, the first bubbler and the 苐2 bubbler are disposed on the same axis. The molten glass manufacturing apparatus according to any one of claims 1 to 3, wherein The constituent material of the melting tank is a portion of the bottom surface of the melting tank containing the Zr〇2 in the bottom surface of the melting tank forming the molten glass flow path from the first bubbler row to the upstream side of 0.1 LF to 0.3 LF. Use the mass% 2 to be 85% or more and 97% The glass-melting refractory refractory material of the present invention, wherein the first blistering device and the second blistering device are The apparatus is made of platinum or a platinum alloy, and the gas supplied from the first bubbler and the second bubbler is a gas-free molten glass made of oxygen-free molten glass. The average flow rate of the gas supplied from the i-th bubbler is [liters per minute], and the average flow rate of the gas supplied from the second bubbling is set to % [liters per minute], and the environment above the first bubbler is set. When the gas temperature is Tirc] and the ambient gas temperature above the second foaming is IK], the molten glass is produced at a condition of VP%. 1. The method for producing a molten glass according to claim 6, wherein an average velocity of the upstream side of the (four) glass formed on the upstream side of the first i-bubble is set to F1 [m/hr], which is compared with the second The bubbler is formed on the downstream side 150041.doc 201111312 The downstream of the molten glass is inverted Γ The thousand-average flow of the claw is set to F2 [m/hrJ, with F,=5~20 m/hr > f2-〇 C 7 ,, • 7 m/hr conditions to make molten glass. 8. A method of manufacturing a flat glass, which is formed by forming a molten glass obtained by a molten glass manufacturing method as claimed in claim 150.