Electric heating device and method for advanced large substrate glass furnace

Abstract

This invention relates to an electric heating device and method for high-generation, large-scale substrate glass furnaces. To solve the problem of insufficient melting in the front area of ​​high-generation, large-scale substrate glass furnaces, an electric heating structure combining side-stacked tin oxide electrodes and bottom-inserted molybdenum electrodes was designed. Furthermore, an appropriate amount of fuel gas was introduced, and the energy consumption and gas / electric thermal energy required for glass melting were calculated based on the extracted amount, resulting in the furnace's overall thermal efficiency. This resulted in the development of a new electric heating device and application method suitable for high-generation, mass-supply substrate glass furnaces, which can solve the problems of insufficient melting and unstable convection in the front area of ​​high-generation, large-scale substrate glass furnaces.

Description

[Technical Field]

[0001] The present invention relates to the field of electric heating structure arrangement in advanced large-scale substrate glass furnaces, and more particularly to an electric heating device and method for advanced large-scale substrate glass furnaces. [Background technology]

[0002] From the traditional color cathode ray tube (CRT) industry to the current flat panel display (FPD) industry, glass has always played an important role as a key component in display devices. Glass not only serves as the frame and carrier for the entire display device, but also as an optical component. The glass used as the upper and lower substrates of FPDs requires precise micro-semiconductor processing, which requires the melting capacity and convection stability of the furnace front area for high-generation, large-scale substrate glass. In the substrate glass manufacturing process, glass batch material is first fed stably and smoothly through a supply system into the furnace inlet. It is then melted, refined, and homogenized in the furnace to produce a homogeneous glass liquid suitable for the next process. The glass liquid melted in the furnace is alkali-free high-aluminum borosilicate glass, and this glass product is primarily used as substrate glass for FPDs. Summary of the Invention [Problem to be solved by the invention]

[0003] However, as the supply of high-generation substrate glass increases, the insufficient melting capacity in the furnace front area and the stability of convection circulation within the furnace have become important issues that need to be addressed urgently. Insufficient melting capacity in the furnace front area causes a large number of defects such as bubbles and stones in the substrate glass products, which has a serious impact on production efficiency. [Means for solving the problem]

[0004] The present invention discloses an electric heating device and method for a high-generation large substrate glass furnace (kiln), which aims to solve the problem of insufficient melting capacity in the pre-melting area of ​​the substrate glass furnace caused by large-scale supply, and ensure the efficient melting of large batches of substrate glass materials and strong guarantee for the stability of convection.

[0005] In order to achieve the above object, the present invention employs the following technical means.

[0006] The present invention includes a bottom pond wall, a front pond wall (6), a rear pond wall (3), a left pond wall (2), a right pond wall (12), a supply port (8), a liquid hole (9), a tin oxide electrode brick (1), a bottom insertion type molybdenum electrode (10), and a lift adjustment mechanism (11), wherein the bottom insertion type molybdenum electrode (10) is a molybdenum electrode that has been subjected to a multi-component co-infiltration treatment, the front pond wall (6), the rear pond wall (3), the right pond wall (12), and the left pond wall (2) are provided on the bottom pond wall, and both ends of the front pond wall (6) are connected to both ends of the rear pond wall (3) via the left pond wall (2) and the right pond wall (12), respectively, the supply port (8) is provided on the front pond wall (6), and the liquid hole (9) is provided on the front pond wall (6). The present invention discloses an electric heating device for a high-generation large substrate glass furnace, in which a plurality of tin oxide electrode bricks (1) are provided on the rear pond wall (3), the plurality of tin oxide electrode bricks (1) are provided at equal intervals on the left pond wall (2) and the right pond wall (12), the plurality of tin oxide electrode bricks (1) are equally spaced, a plurality of bottom-insertion-type molybdenum electrodes (10) are provided on the bottom pond wall, a portion of the tin oxide electrode brick (1) on the left pond wall (2) protrudes outside the left pond wall (2), and a portion of the tin oxide electrode brick (1) on the right pond wall (12) protrudes outside the right pond wall (12), and a lift adjustment mechanism (11) is attached to the bottom of the protruding portion of the tin oxide electrode brick (1).

[0007] Furthermore, two of the supply ports (8) are provided on the front reservoir wall (6).

[0008] Furthermore, eight tin oxide electrode bricks (1) are provided at equal intervals on the left pond wall (2), and eight tin oxide electrode bricks (1) are also provided at equal intervals on the right pond wall (12).

[0009] Furthermore, the position of the tin oxide electrode brick (1) on the left pond wall (2) corresponds to the position of the tin oxide electrode brick (1) on the right pond wall (12).

[0010] Furthermore, the distance between the two tin oxide electrode bricks (1) at corresponding positions on the left pond wall (2) and the right pond wall (12) is at least twice the width of the tin oxide electrode brick (1).

[0011] Furthermore, four bottom insertion type molybdenum electrodes (10) are provided, and these four bottom insertion type molybdenum electrodes (10) are parallel to each other.

[0012] Furthermore, two of the bottom insertion type molybdenum electrodes (10) are provided near the left pond wall (2), and two more of the bottom insertion type molybdenum electrodes (10) are provided near the right pond wall (12).

[0013] Furthermore, the distance between the top of the tin oxide electrode brick (1) and the top of the left pond wall (2) is greater than 70 mm, and the distance between the top of the tin oxide electrode brick (1) and the top of the right pond wall (12) is greater than 70 mm.

[0014] Additionally, the bottom-insertion molybdenum electrode (10) is maintained flush with the inside surface of the bottom pond wall.

[0015] The present invention also discloses a method for applying an electric heating device for an advanced large-scale substrate glass furnace based on the above electric heating device, the method comprising the steps of providing two supply ports (8) in a front pond wall (6) and one liquid hole (9) in a rear pond wall (3); installing eight tin oxide electrode bricks (1) at equal intervals on a left pond wall (2) and eight tin oxide electrode bricks (1) at equal intervals on a corresponding position on a right pond wall (12), the distance between two tin oxide electrode bricks (1) at corresponding positions being 2300 mm to 2320 mm, and attaching a lift adjustment mechanism (11) to the bottom of each tin oxide electrode brick (1); and installing a bottom-insertion molybdenum electrode (10) on the bottom pond wall, and subjecting the bottom-insertion molybdenum electrode (10) to a multi-component co-infiltration treatment before installation to form a high-temperature oxidation-resistant coating on the surface of the bottom-insertion molybdenum electrode (10). [Effects of the Invention]

[0016] The present invention has the following beneficial effects. The present invention discloses an electric heating device and method for a high-generation large-sized substrate glass furnace, in which a bottom-insertion molybdenum electrode is treated with a multi-component co-infiltration process, and then the bottom-insertion molybdenum electrode is installed on the bottom wall of the pond, so that a high-temperature oxidation-resistant film can be formed on the surface of the molybdenum electrode; This solves the problem that molybdenum electrodes cannot be used in an oxidizing atmosphere. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a front view of a high-generation large substrate glass furnace electric heating device. [Figure 2] FIG. 1 is a plan view of a high-generation large substrate glass furnace electric heating device. [Figure 3] FIG. 1 is a side view of a high-generation large substrate glass furnace electric heating device. DETAILED DESCRIPTION OF THE INVENTION

[0018] Certain illustrative embodiments are briefly described below, but the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Accordingly, the drawings and description should be regarded as illustrative in nature and not restrictive.

[0019] In describing the present invention, terms indicating orientations and positional relationships, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "upper," "lower," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," are based on the orientations and positional relationships shown in the drawings and are intended to simplify the description of the present invention and do not indicate that the devices or parts referred to must be in a specific orientation, structure, or operation. Therefore, they should not be construed as limiting the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not indicate relative importance or imply a quantity of the specified technical features. Thus, features qualified as "first" or "second" may explicitly or implicitly include one or more of the corresponding features. In describing this invention, "plurality" means two or more, unless expressly specified otherwise.

[0021] In the present invention, unless otherwise clearly specified or limited, the terms "attach," "connect," "couple," "fix," and the like should be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or integration. They may also refer to a mechanical connection, an electrical connection, or a connection by communication. They may also refer to a direct connection, an indirect connection via an intermediate medium, or a communication or interaction relationship between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in the present invention depending on the specific circumstances.

[0022] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0023] Example 1 As shown in Figures 1 and 2, the new electric furnace heating device for high-generation large-sized glass substrates has a front pond wall 6, a rear pond wall 3, a left pond wall 2, and a right pond wall 12 on the bottom pond wall, which together form a semi-closed rectangular structure. Two supply ports 8 are provided on the front pond wall 6, and one liquid port 9 is provided on the rear pond wall 3. Side-stacked tin oxide electrode bricks 1 are installed on the left pond wall 2 and the right pond wall 12, and a lift adjustment mechanism 11 is designed at the bottom of the tin oxide electrode brick 1. A bottom-insertion molybdenum electrode 10 is also designed on the bottom pond wall.

[0024] Specifically, the position of the tin oxide electrode brick 1 on the left pond wall 2 corresponds to the position of the tin oxide electrode brick 1 on the right pond wall 12 .

[0025] Specifically, the distance between the bottom insertion type molybdenum electrodes 10 and the inside of the front pond wall 6 is 620 mm to 630 mm, and the distance between the bottom insertion type molybdenum electrodes 10 on both sides is 960 mm to 980 mm. This solves the problem of insufficient melting capacity in the pre-pre-melting area of ​​a substrate glass furnace with a large input amount.

[0026] Specifically, four bottom insertion type molybdenum electrodes 10 are installed on the bottom pond wall, and these bottom insertion type molybdenum electrodes 10 are parallel to each other.

[0027] Specifically, the selected bottom insertion molybdenum electrode 10 has a melting point of over 2420°C and a density of 10.2 g / cm 3 and the surface current density is 0.7 to 1.0 A / cm 2 and can maintain a long operating life.

[0028] Specifically, before applying the selected bottom-insertion molybdenum electrode 10, a multi-component co-infiltration process is used to form a high-temperature oxidation-resistant film (high-temperature oxidation-resistant coating) on ​​the surface of the pure molybdenum electrode, and the outermost layer of the coating is a SiO2 coating. Specifically, the melting point of the tin oxide electrode brick 1 is above 1630°C and the density is 6.5 g / cm3. 3 and the current density is over 0.1 A / cm 2 less than 1000 kJ / s and can maintain a long operating life.

[0029] Specifically, a total of eight pairs of tin oxide electrode bricks 1 are designed at corresponding positions on the left pond wall 2 and the right pond wall 12, and the spacing between each pair of tin oxide electrode bricks 1 is 2300 mm to 2320 mm. This ensures that the voltage between each pair of electrodes is less than 1100 V. In addition, the spacing between each pair of tin oxide electrode bricks 1 is required to be at least twice the width of the tin oxide electrode bricks 1.

[0030] Specifically, in order to suppress high-temperature oxidation and volatilization of the electrode, the tin oxide electrode brick 1 must be covered with a normal glass liquid surface, and therefore, the liquid surface must be covered so that it is at least 70 mm higher than the top end of the tin oxide electrode brick 1.

[0031] Specifically, to address the melting problem in the pre-pre-melting area of ​​the furnace caused by the large amount of supply, the present invention designs two pairs of bottom-insertion type molybdenum electrodes 10 in the pre-pre-melting area of ​​the furnace, the top surface of which is flush with the bottom of the pond, and is used to improve the melting problem at the bottom of the raw material pile.

[0032] The electric heating method for a high-generation large substrate glass furnace according to the present invention includes the following steps:

[0033] Step S1: Two supply ports (8) are provided in the front reservoir wall (6), and one liquid hole (9) is provided in the rear reservoir wall.

[0034] In step S2, eight tin oxide electrode bricks (1) are installed at equal intervals on the left pond wall (2), and eight more tin oxide electrode bricks (1) are installed at equal intervals at corresponding positions on the right pond wall (12). The distance between two tin oxide electrode bricks (1) at corresponding positions is 2300 mm to 2320 mm. A lift adjustment mechanism (11) is attached to the bottom of each tin oxide electrode brick (1).

[0035] Step S3: Install a bottom-insertion molybdenum electrode 10 on the bottom wall of the bottom pond. Before installation, the bottom-insertion molybdenum electrode 10 is subjected to a multi-component co-infiltration treatment to form a high-temperature oxidation-resistant film on its surface.

[0036] This invention focuses on the electrode arrangement. The addition of a side wall 5 and burner nozzle brick 4 to the structure shown in Figure 3 emphasizes that this furnace is a gas-electric mixed furnace. Molybdenum electrodes are typically used in reducing atmospheres and are easily oxidized to MoO3, which volatilizes, in oxidizing atmospheres. Therefore, when using molybdenum electrodes, this invention uses a multi-component co-infiltration process to form a high-temperature oxidation-resistant coating on the surface of the molybdenum electrode, preventing serious oxidation and volatilization if the molybdenum electrode is not covered with glass during the liquid level rise process. Before applying the selected molybdenum electrode in this structure, a multi-component co-infiltration process is used to form a high-temperature oxidation-resistant coating on the surface of the pure molybdenum electrode. The outermost layer of the coating is an SiO2 coating.

[0037] In the present invention, when calculating the overall thermal efficiency of the furnace, different combinations of gas and electricity ratios can be used, so as to ensure the overall thermal efficiency of the furnace.

[0038] Table 1 shows the overall thermal efficiency of the furnace at different gas-to-electric ratios. [Table 1]

[0039] This invention relates to a new electric heating structure for furnaces for large, high-generation glass substrates. Simulation analysis was conducted to address the issues of insufficient melting and unstable convection in the pre-melting area of ​​a furnace for high-generation glass substrates under large-volume feed conditions. Different electricity and gas consumption models were designed, and the furnace's overall thermal efficiency was calculated to be 30% to 40%. A side-stack tin oxide electrode structure was rationally arranged, and bottom-insertion molybdenum electrodes were scientifically and rationally designed at the bottom of the furnace's pre-melting area. A high-temperature oxidation-resistant coating was formed on the surface of the molybdenum electrode using a multi-component co-infiltration method, resolving the difficult issue of molybdenum electrodes being inoperable in oxidizing atmospheres. Furthermore, the safe upper limit of the current density of the designed tin oxide and molybdenum electrodes ensures long-term stable operation of the electrodes, solving the problem of insufficient melting capacity in the pre-melting area of ​​a furnace for high-generation glass substrates under large-volume feed conditions and providing strong guarantees for efficient melting and stable convection in the pre-melting area of ​​a large-volume glass substrate.

[0040] It is known from common technical knowledge that the present invention can be embodied in other embodiments without departing from the spirit or essential characteristics of the invention. Therefore, the above-described embodiments are merely illustrative in all respects, and all modifications within the scope of the present invention or equivalents thereof are included in the present invention. [Explanation of symbols]

[0041] 1 tin oxide electrode brick 2 Left tank wall 3 Rear tank wall 4 burner nozzle bricks 5 Side battlements 6 Front tank wall 7 Liquid level line 8 Supply Inlet 9 liquid hole 10 Bottom insertion type molybdenum electrode 11. Lift adjustment mechanism 12 Right tank wall

Claims

1. The apparatus includes a bottom pond wall, a front pond wall (6), a rear pond wall (3), a left pond wall (2), a right pond wall (12), a supply port (8), a liquid hole (9), a tin oxide electrode brick (1), a bottom-inserted molybdenum electrode (10), and a lift adjustment mechanism (11). The bottom insertion type molybdenum electrode (10) is a molybdenum electrode that has been subjected to a multi-component co-infiltration treatment, The front pond wall (6), the rear pond wall (3), the right pond wall (12) and the left pond wall (2) are provided on the bottom pond wall; Both ends of the front pond wall (6) are connected to both ends of the rear pond wall (3) via the left pond wall (2) and the right pond wall (12), respectively; The supply port (8) is provided on the front reservoir wall (6), and the liquid hole (9) is provided on the rear reservoir wall (3); A plurality of the tin oxide electrode bricks (1) are provided at equal intervals on the left pond wall (2) and the right pond wall (12); The intervals between the plurality of tin oxide electrode bricks (1) are equal, A plurality of bottom-insertion molybdenum electrodes (10) are provided on the bottom pond wall, a portion of the tin oxide electrode brick (1) on the left pond wall (2) protrudes outside the left pond wall (2), and a portion of the tin oxide electrode brick (1) on the right pond wall (12) protrudes outside the right pond wall (12); The electric heating device for a high-generation large substrate glass furnace has a lift adjustment mechanism (11) attached to the bottom of the protruding part of the tin oxide electrode brick (1).

2. 2. The electric heating device for a high-generation large substrate glass furnace according to claim 1, wherein two of the supply ports (8) are provided on the front pond wall (6).

3. 2. The electric heating device for an advanced large-sized substrate glass furnace according to claim 1, wherein eight of the tin oxide electrode bricks (1) are provided at equal intervals on the left pond wall (2), and eight of the tin oxide electrode bricks (1) are also provided at equal intervals on the right pond wall (12).

4. 2. The electric heating device for advanced large substrate glass furnaces according to claim 1, wherein the position of the tin oxide electrode brick (1) on the left pond wall (2) corresponds to the position of the tin oxide electrode brick (1) on the right pond wall (12).

5. 5. The electric heating device for advanced large substrate glass furnaces according to claim 4, wherein the distance between two of the tin oxide electrode bricks (1) at corresponding positions on the left pond wall (2) and the right pond wall (12) is not less than twice the width of the tin oxide electrode brick (1).

6. 2. The electric heating device for a large-sized substrate glass furnace according to claim 1, wherein four bottom-insertion type molybdenum electrodes (10) are provided, and the four bottom-insertion type molybdenum electrodes (10) are parallel to each other.

7. 7. The electric heating device for a large substrate glass furnace according to claim 6, wherein two of the bottom insertion type molybdenum electrodes (10) are provided near the left pond wall (2), and another two of the bottom insertion type molybdenum electrodes (10) are provided near the right pond wall (12).

8. 2. The electric heating device for an advanced large substrate glass furnace according to claim 1, wherein the distance between the top of the tin oxide electrode brick (1) and the top of the left pond wall (2) is greater than 70 mm, and the distance between the top of the tin oxide electrode brick (1) and the top of the right pond wall (12) is greater than 70 mm.

9. 2. The electric heating apparatus for advanced large substrate glass furnaces according to claim 1, wherein said bottom-insertion molybdenum electrode (10) is kept flush with the inner surface of said bottom pond wall.

10. An electric heating method for a high-generation large substrate glass furnace based on the electric heating device according to any one of claims 1 to 9, providing two feed ports (8) in the front reservoir wall (6) and one liquid hole (9) in the rear reservoir wall (3); installing eight tin oxide electrode bricks (1) at equal intervals on the left pond wall (2) and eight tin oxide electrode bricks (1) at equal intervals on the corresponding positions on the right pond wall (12), the distance between two tin oxide electrode bricks (1) at corresponding positions being 2300 mm to 2320 mm, and attaching a lift adjustment mechanism (11) to the bottom of each of the tin oxide electrode bricks (1); a bottom-insertion molybdenum electrode (10) is installed on the bottom pond wall, and the bottom-insertion molybdenum electrode (10) is subjected to a multi-component co-infiltration treatment before installation to form a high-temperature oxidation-resistant coating on the surface of the bottom-insertion molybdenum electrode (10).

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