Sealing device and method for molybdenum electrode heating element of substrate glass kiln

Abstract

The invention relates to the technical field of molybdenum electrode heating element protection, in particular to a sealing device and method for a molybdenum electrode heating element of a substrate glass kiln. The sealing device of the molybdenum electrode heating element of the substrate glass kiln comprises a molybdenum electrode, a water cooling device, a pool bottom face brick layer and a refractory material layer, the pool bottom face brick layer and the refractory material layer are arranged at the bottom of a kiln pool, and stepped holes communicated with the kiln pool are formed in the pool bottom face brick layer and the refractory material layer; the water cooling device sleeves the lower end of the molybdenum electrode and is inserted into the stepped hole, so that the upper end surface of the molybdenum electrode is flush with the upper end surface of the pool bottom brick layer, and the upper end surface of the molybdenum electrode is covered with an electric melting high-zirconium brick and is completely covered with the first cullet powder; a first sealing gap is formed between the molybdenum electrode and the stepped hole; a second sealing gap is formed between the molybdenum electrode and the water cooling device, second cullet powder is arranged between the upper end face of the water cooling device and the stepped position of the stepped hole, the first cullet powder and the second cullet powder are melted in the heating process, complete sealing of the molybdenum electrode is achieved, and oxidation is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of molybdenum electrode heating element protection, and in particular to a sealing device and method for a molybdenum electrode heating element of a substrate glass furnace. Background Art

[0002] Glass products have always been widely used in the display field. Although other materials can replace glass materials in some occasions, they still cannot replace the excellent performance of glass materials. From the traditional color cathode ray tube industry to the current flat panel display industry, glass products have always played a key role in display devices as key components, that is, glass products are the framework and carrier of the entire key components, and are also key optical elements. Glass products are the upper and lower substrates of flat panel display devices, which require fine microscopic semiconductor processing and production.

[0003] At present, in the manufacturing process of substrate glass, the glass batch needs to be stably and smoothly fed into the feeding port of the melting furnace through the feeding system, and then melted, clarified and homogenized in the melting furnace to provide qualified and homogeneous glass liquid for the next process. The molten glass liquid in the melting furnace is generally alkali-free high-aluminum borosilicate glass, and this glass product is mainly substrate glass for flat panel displays. With the increase in the amount of glass melted and the increase in the amount of large feed and ultra-fine substrate glass drawn out, the existing kiln heating elements cannot meet the melting requirements, which will inevitably put forward new requirements for the melting capacity of the kiln. Only by developing new high-generation and large-tonnage kiln heating element structures, and must achieve high-temperature stable operation of the new heating elements, can high-quality and efficient melting of high-generation and large-tonnage kiln batch materials be achieved.

[0004] In the prior art, a kiln structure with molybdenum electrodes as heating elements is developed. However, when the molybdenum electrode material is heated to 400°C, it begins to oxidize to generate molybdenum oxide (MoO) and molybdenum dioxide (MoO2), when heated to 500-700°C, it generates molybdenum trioxide (MoO3), and when heated to above 800°C, it generates molybdenum carbide (Mo2C). Therefore, when the molybdenum electrode is used above 400°C, it must be isolated from the air or immersed in glass liquid to meet the use conditions of the molybdenum electrode in a reducing atmosphere. However, in the current kiln structure, since the molybdenum electrode is not pushed into the kiln during the process of raising the kiln glass liquid level, the glass liquid does not completely cover the molybdenum electrode. At this time, the molybdenum electrode is very easy to oxidize and volatilize, affecting its normal use. Summary of the invention

[0005] The object of the present invention is to provide a sealing device for a molybdenum electrode heating element of a substrate glass furnace, so as to solve the problem in the prior art that the molybdenum electrode in the substrate glass furnace is easily oxidized and volatilized.

[0006] In order to solve the above problems, the present invention proposes a sealing device for a molybdenum electrode heating element of a substrate glass furnace, and the technical solution adopted is: A sealing device for a molybdenum electrode heating element of a substrate glass kiln comprises a molybdenum electrode, a water cooling device, and a bottom brick layer and a refractory material layer arranged at the bottom of a kiln pool, wherein the bottom brick layer and the refractory material layer are provided with a stepped hole connected to the kiln pool, and the stepped position of the stepped hole is in the refractory material layer; the water cooling device is sleeved on the lower end of the molybdenum electrode and inserted into the stepped hole so that the end face of the insertion end of the molybdenum electrode is flush with the upper end face of the bottom brick layer, and the end face of the insertion end of the molybdenum electrode is covered with an electric fused high zirconium layer arranged in the kiln pool. Bricks, the fused high zirconium bricks are completely covered with the first broken glass powder; a first sealing gap is provided between the molybdenum electrode and the inner circumference of the step hole, and the height of the first sealing gap is consistent with the thickness of the pool bottom brick layer; a second sealing gap is provided between the molybdenum electrode and the water cooling device, and a second broken glass powder is provided between the upper end surface of the water cooling device and the stepped position of the step hole. During the heating process, the first broken glass powder melts into the first sealing gap, and the second broken glass powder melts into the second sealing gap, thereby realizing complete sealing of the molybdenum electrode.

[0007] Furthermore, the spacing of the first sealing gaps is smaller than the spacing of the second sealing gaps.

[0008] Furthermore, the spacing of the first sealing gaps is 1-3 mm, and the spacing of the second sealing gaps is 1-4 mm.

[0009] Furthermore, the water cooling device includes a cooling water return pipeline and a cooling water inlet pipeline, and the cooling water return pipeline and the cooling water inlet pipeline are arranged on opposite sides of the molybdenum electrode.

[0010] Furthermore, the sealing device also includes a temperature detection system arranged in the water cooling device, and the temperature detection system is respectively arranged on the side of the cooling return water pipeline away from the molybdenum electrode and the side of the cooling water inlet pipeline away from the molybdenum electrode, for detecting the temperature in the water cooling device.

[0011] Furthermore, the raw materials of the first cullet powder and the second cullet powder are the same as the raw materials of the substrate glass, and the particle sizes of the first cullet powder and the second cullet powder are less than 1 mm.

[0012] Furthermore, the melting point of the molybdenum electrode is greater than 2620°C and the density is greater than 10.23 g / cm 3 , thermal expansion coefficient <5.1×10 -6 / ℃, critical current density is 0.4~0.7A / cm 2 .

[0013] Furthermore, the pool bottom bricks in the pool bottom brick layer are fused high zirconium bricks, and the density of the fused high zirconium bricks is greater than 5.4 g / cm3 The weight percentage of ZrO2 in the fused high zirconium brick is greater than 95%, and the apparent porosity is less than 3%.

[0014] Furthermore, the sealing device also includes a temperature monitoring system arranged at the lower end of the water cooling device, and a main temperature monitoring point is arranged at the lower end of the second sealing gap and close to the molybdenum electrode. The temperature monitoring system is used to monitor the temperature of the main temperature monitoring point.

[0015] Beneficial effects: The present invention is an improved invention, in which the end face of the insertion end of the molybdenum electrode is flush with the upper end face of the pool bottom brick, and the end face of the insertion end of the molybdenum electrode is covered with an electric-melted high-zirconium brick arranged in the kiln pool, and the electric-melted high-zirconium brick is completely buried with the first broken glass powder; at the same time, a first sealing gap is provided between the molybdenum electrode and the inner circumferential surface of the step hole, and the height of the first sealing gap is consistent with the thickness of the pool bottom brick layer, a second sealing gap is provided between the molybdenum electrode and the water cooling device, and a second broken glass powder is provided between the upper end face of the cooling device and the contact surface of the step hole. During the heating process, the first broken glass powder can be melted into glass liquid and enter the first sealing gap to seal and cover the molybdenum electrode at this position. At the same time, the glass liquid also enters the gap between the end face of the insertion end of the molybdenum electrode and the electric-melted high-zirconium brick and the gap position between the molybdenum electrode and the refractory material layer. Under the cooling action of the cooling device, the upper end face of the molybdenum electrode and the circumferential surface of the molybdenum electrode at the position of the pool bottom brick layer and the refractory material layer are completely sealed. In addition, the second broken glass powder is melted into glass liquid and enters the second sealing gap to seal and cover the molybdenum electrode at this position. At the same time, combined with the process of the molybdenum electrode gradually being pushed upward during the melting and rising liquid level of the second broken glass powder, the glass liquid of the molten second broken glass powder covers the circumferential surface of the lower end of the molybdenum electrode. Under the cooling action of the cooling device, the circumferential surface of the molybdenum electrode at the position of the cooling device and the circumferential surface of the lower end of the molybdenum electrode are completely sealed; finally, the surface of the molybdenum electrode is completely covered.

[0016] The sealing device of the molybdenum electrode heating element of the substrate glass kiln of the present invention avoids oxidation damage to the molybdenum electrode heating element and avoids its influence on normal use function; in the process of raising the kiln liquid level, the complete covering of the molybdenum electrode surface isolates the air from the molybdenum electrode, prevents the oxidative volatilization of the molybdenum electrode in an oxidizing atmosphere, and creates better use conditions for the molybdenum electrode in a reducing atmosphere; at the same time, the present invention systematically sets a sealing device in the process of heating the molybdenum electrode, so that the glass liquid completely covers the surface of the molybdenum electrode, solves the problem of easy oxidation volatilization of the molybdenum electrode when it is not completely covered by the glass liquid during the heating process of the kiln, and realizes efficient and stable operation of the molybdenum electrode heating element.

[0017] The present invention also provides a sealing method for a molybdenum electrode heating element of a substrate glass furnace, based on the sealing device of the molybdenum electrode heating element of the substrate glass furnace, comprising the following steps: S1, inserting a molybdenum electrode provided with a water cooling device into the stepped hole, so that a first sealing gap is provided between the molybdenum electrode and the inner circumferential surface of the stepped hole, and a second sealing gap is provided between the molybdenum electrode and the water cooling device; S2, covering the end surface of the molybdenum electrode insertion end with a fused high zirconium brick, and using the first cullet to completely cover the fused high zirconium brick; at the same time, setting the second cullet between the upper end surface of the water cooling device and the stepped position of the stepped hole; S3, the glass furnace of the substrate is heated up, during the heating process, the first broken glass powder melts and enters the first sealing gap, and the second broken glass powder melts and enters the second sealing gap, thereby achieving complete sealing of the molybdenum electrode; wherein, the temperature monitoring system in the sealing device is used to monitor the temperature of the main temperature monitoring point set at the lower end position of the second sealing gap and close to the molybdenum electrode to ensure that the temperature of the main temperature monitoring point is less than 200°C.

[0018] The spacing of the first sealing gap is smaller than that of the second sealing gap, which fully ensures that the first broken glass powder is sealed in the first sealing gap after melting, and prevents oxidation of the upper molybdenum electrode during the process of gradually moving upward during the rising liquid level.

[0019] The water cooling device comprises a cooling water return pipeline and a cooling water inlet pipeline, and the cooling water return pipeline and the cooling water inlet pipeline are arranged on opposite sides of the molybdenum electrode, which is convenient for water cooling and has a simple structure.

[0020] The sealing device also includes a temperature detection system arranged in the water cooling device, and the temperature detection system is respectively arranged on the side of the cooling return water pipeline away from the molybdenum electrode and the side of the cooling water inlet pipeline away from the molybdenum electrode, and is used to detect the temperature in the water cooling device, which can effectively prevent the temperature from being too high.

[0021] The raw materials of the first and second cullet powders are the same as those of the substrate glass, and the particle sizes of the first and second cullet powders are less than 1 mm, so as to avoid affecting the original glass liquid in the substrate glass, and the first and second cullet powders will not pollute the pool bottom after melting.

[0022] The pool bottom bricks in the pool bottom brick layer are fused high zirconium bricks, and the density of the fused high zirconium bricks is greater than 5.4 g / cm 3 The weight percentage of ZrO2 in the fused high zirconium brick is greater than 95%, and the apparent porosity is less than 3%. The fused high zirconium brick combined with broken glass powder has a higher sealing and high-temperature anti-oxidation function, and its thermal shock resistance is weaker and the temperature fluctuation is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the sealing device in Embodiment 1 of the sealing device of the molybdenum electrode heating element of the substrate glass furnace of the present invention; In the figure, 1. molybdenum electrode, 2. pool bottom brick layer, 3. refractory material layer, 4. first sealing gap, 5. second sealing gap, 6. fused high zirconium brick, 7. first broken glass powder, 8. second broken glass powder, 9. cooling return water pipeline, 10. cooling water inlet pipeline, 11. thermocouple, 12. glass liquid. DETAILED DESCRIPTION

[0024] As cited in the background technology, the molybdenum electrode 1 in the substrate glass kiln in the prior art is easily oxidized and volatilized. Therefore, the present invention provides a sealing device for the molybdenum electrode heating element of the substrate glass kiln, comprising a molybdenum electrode 1, a water cooling device, and a bottom brick layer 2 and a refractory material layer 3 arranged at the bottom of the kiln pool, wherein the molybdenum electrode 1 is used as a heating element; the water cooling device is used to prevent the molybdenum electrode 1 from oxidizing at high temperatures and ensure the stable operation of the molybdenum electrode 1; the bottom brick layer 2 and the refractory material layer 3 are provided with a stepped hole connected to the kiln pool, and the stepped position of the stepped hole is in the refractory material layer 3, which is used to cooperate with the water cooling device and the molybdenum electrode 1; the water cooling device is sleeved on the lower end of the molybdenum electrode 1 and inserted into the stepped hole so that the end face of the insertion end of the molybdenum electrode 1 is flush with the upper end face of the bottom brick, and the end face of the insertion end of the molybdenum electrode 1 is covered with a layer arranged on the kiln pool. The fused high-zirconium bricks 6 in the furnace pool are completely covered with the first broken glass powder 7, which are used to melt the first broken glass powder 7 so that it covers the upper surface of the molybdenum electrode 1; a first sealing gap 4 is provided between the molybdenum electrode 1 and the inner circumference of the step hole, and the height of the first sealing gap 4 is consistent with the thickness of the pool bottom brick layer 2, which is used to melt the first broken glass powder 7 so that it enters the first sealing gap 4 and covers the circumferential surface of the molybdenum electrode 1 corresponding to the first sealing gap 4 after cooling; a second sealing gap 5 is provided between the molybdenum electrode 1 and the water cooling device, and a second broken glass powder 8 is provided between the upper end surface of the water cooling device and the stepped position of the step hole, and the second broken glass powder 8 melts and covers the circumferential surface of the molybdenum electrode 1 corresponding to the second sealing gap 5.

[0025] During the heating process, the first broken glass powder 7 can be melted into glass liquid and enter the first sealing gap 4 to seal and cover the molybdenum electrode 1 at this position. At the same time, the glass liquid also enters the gap between the end face of the insertion end of the molybdenum electrode 1 and the electric fused high zirconium brick 6 and the gap between the molybdenum electrode 1 and the refractory material layer 3. Under the cooling action of the cooling device, the upper end face of the molybdenum electrode 1 and the circumferential surface of the molybdenum electrode 1 at the position of the pool bottom brick layer 2 and the refractory material layer 3 are completely sealed; in addition, the second broken glass powder 8 is melted into glass liquid and enters the second sealing gap 5 to seal and cover the molybdenum electrode 1 at this position. At the same time, combined with the process of the molybdenum electrode 1 gradually pushing upward during the melting and rising of the second broken glass powder 8, the glass liquid of the molten second broken glass powder 8 covers the circumferential surface of the lower end of the molybdenum electrode 1. Under the cooling action of the cooling device, the circumferential surface of the molybdenum electrode 1 at the cooling device position and the circumferential surface of the lower end of the molybdenum electrode 1 are completely sealed; finally, the surface of the molybdenum electrode 1 is completely covered and sealed.

[0026] Specific embodiment 1 of the sealing device of the substrate glass furnace molybdenum electrode heating element of the present invention: In this embodiment, Figure 1 As shown, a sealing device for a molybdenum electrode heating element of a substrate glass kiln comprises a molybdenum electrode 1, a water cooling device, and a bottom brick layer 2 and a refractory material layer 3 arranged at the bottom of the kiln pool, wherein the bottom brick layer 2 and the refractory material layer 3 are provided with a stepped hole connected to the kiln pool, and the stepped position of the stepped hole is in the refractory material layer 3, wherein there is glass liquid 12 in the kiln pool; the water cooling device is sleeved on the lower end of the molybdenum electrode 1 and inserted into the stepped hole so that the end face of the insertion end of the molybdenum electrode 1 is flush with the upper end face of the bottom brick, and the end face of the insertion end of the molybdenum electrode 1 is covered with a glass liquid 12 arranged in the kiln pool; Electric-fused high-zirconium bricks 6 are completely covered by first broken glass powder 7; a first sealing gap 4 is provided between the molybdenum electrode 1 and the inner circumference of the step hole, and the height of the first sealing gap 4 is consistent with the thickness of the pool bottom brick layer 2; a second sealing gap 5 is provided between the molybdenum electrode 1 and the water cooling device; a second broken glass powder 8 is provided between the upper end surface of the water cooling device and the stepped position of the step hole; during the heating process, the first broken glass powder 7 melts into the first sealing gap 4, and the second broken glass powder 8 melts into the second sealing gap 5, thereby realizing complete sealing of the molybdenum electrode 1.

[0027] Specifically, the spacing of the first sealing gap 4 is smaller than the spacing of the second sealing gap 5, the spacing of the first sealing gap 4 is 1-3 mm, and the spacing of the second sealing gap 5 is 1-4 mm. The thickness of the fused high zirconium brick 6 is 20 mm.

[0028] In other embodiments, the spacing of the first sealing gaps 4 may be equal to the spacing of the second sealing gaps 5 ; the spacing of the first sealing gaps 4 may be greater than the spacing of the second sealing gaps 5 .

[0029] Specific embodiment 2 of the sealing device of the substrate glass furnace molybdenum electrode heating element of the present invention: Based on the above technical concept of the present invention, or based on the above specific embodiment of the present invention, another embodiment is provided below.

[0030] In this embodiment, Figure 1As shown, the water cooling device includes a cooling water return pipeline 9 and a cooling water inlet pipeline 10, and the cooling water return pipeline 9 and the cooling water inlet pipeline 10 are arranged on opposite sides of the molybdenum electrode 1 to adjust the water inlet and return flow rates. The sealing device also includes a temperature detection system in the water cooling device, and the temperature detection system is respectively arranged on the side of the cooling water return pipeline 9 away from the molybdenum electrode 1 and the side of the cooling water inlet pipeline 10 away from the molybdenum electrode 1, and is used to detect the temperature in the water cooling device. Specifically, the temperature detection system is a thermocouple 11, which performs temperature monitoring feedback. The thermocouple 11 is a B-type thermocouple, and its positive and negative electrode materials meet the national standard. The positive electrode is PtRh30, the negative electrode is PtRh6, and the thermocouple core wire diameter is 0.8mm; at the same time, the material of the B-type thermocouple sleeve is a high-purity corundum tube, and the weight percentage of Al2O3 in the high-purity corundum tube is greater than 99.7%, which has strong high-temperature thermal stability.

[0031] The raw materials of the first cullet powder 7 and the second cullet powder 8 are the same as those of the substrate glass, and the particle sizes of the first cullet powder 7 and the second cullet powder 8 are less than 1 mm. The first cullet powder 7 and the second cullet powder 8 are fine powders normally ground from the substrate glass production line products, and will not cause pollution to the pool bottom after melting.

[0032] Specifically, the molybdenum electrode 1 has a specification of φ200 2000mm, melting point of molybdenum electrode 1>2620℃, density>10.23g / cm 3 , thermal expansion coefficient <5.1×10 -6 / ℃, critical current density is 0.4~0.7A / cm 2 The pool bottom bricks in the pool bottom brick layer 2 are fused high zirconium bricks 6, and the density of fused high zirconium bricks 6 is greater than 5.4 g / cm 3 The weight percentage of ZrO2 in the fused high zirconium brick 6 is greater than 95%, and the apparent porosity is less than 3%. Combined with the broken glass powder, it has a high sealing high temperature anti-oxidation function. The sealing device also includes a temperature monitoring system arranged at the lower end of the water cooling device. A main temperature monitoring point is arranged at the lower end of the second sealing gap 5 and close to the molybdenum electrode 1. The temperature monitoring system is used to monitor the temperature of the main temperature monitoring point. The temperature of the main temperature monitoring point is less than 200°C.

[0033] Specific embodiment 1 of the sealing method of the substrate glass furnace molybdenum electrode heating element of the present invention: In this embodiment, Figure 1 As shown, based on the above-mentioned sealing device of the molybdenum electrode heating element of the substrate glass furnace, the sealing method of the molybdenum electrode heating element of the substrate glass furnace includes the following steps: First, insert the molybdenum electrode 1 with the water cooling device into the stepped hole, so that a first sealing gap 4 is provided between the molybdenum electrode 1 and the inner circumference of the stepped hole, and a second sealing gap 5 is provided between the molybdenum electrode 1 and the water cooling device; Secondly, the end surface of the insertion end of the molybdenum electrode 1 is covered with a fused high zirconium brick 6, and the fused high zirconium brick 6 is completely covered with a first cullet 7; at the same time, a second cullet 8 is arranged between the upper end surface of the water cooling device and the stepped position of the stepped hole; Finally, the substrate glass furnace is heated up, and during the heating process, the first broken glass powder 7 melts and enters the first sealing gap 4, and the second broken glass powder 8 melts and enters the second sealing gap 5, thereby achieving complete sealing of the molybdenum electrode 1; wherein, the temperature monitoring system in the sealing device is used to monitor the temperature of the main temperature monitoring point set at the lower end position of the second sealing gap 5 and close to the molybdenum electrode 1 to ensure that the temperature of the main temperature monitoring point is less than 200°C.

[0034] Specifically, the sealing method of the molybdenum electrode heating element of the substrate glass furnace includes the following steps: First, a stepped hole connected to the kiln pool is opened on the bottom brick layer 2 and the refractory layer 3 at the bottom of the kiln pool, and the stepped position of the stepped hole is in the refractory layer 3; Secondly, install the water cooling device on a φ200 The lower end of the 2000mm molybdenum electrode 1 is inserted into the stepped hole so that the end face of the inserted end of the molybdenum electrode 1 is flush with the upper end face of the pool bottom tile; a first sealing gap 4 of 2mm is provided between the molybdenum electrode 1 and the inner circumference of the stepped hole, and the height of the first sealing gap 4 is consistent with the thickness of the pool bottom tile layer 2; a second sealing gap 5 of 3mm is provided between the molybdenum electrode 1 and the water cooling device; Next, the end surface of the insertion end of the molybdenum electrode 1 is covered with a 20 mm thick fused high zirconium brick 6 set in the kiln pool, and the fused high zirconium brick 6 is completely covered by the first broken glass powder 7; the second broken glass powder 8 is set between the upper end surface of the cooling device and the stepped position of the stepped hole; Finally, the substrate glass furnace is heated up. During the heating process, the first broken glass powder 7 melts and enters the first sealing gap 4. At the same time, the molten glass liquid also enters the gap between the end face of the insertion end of the molybdenum electrode 1 and the fused high zirconium brick 6 and the gap between the molybdenum electrode 1 and the refractory material layer 3; the second broken glass powder 8 melts and enters the second sealing gap 5. At the same time, combined with the process of the molybdenum electrode 1 gradually moving upward during the liquid level rise, the molten second broken glass powder 8 covers the circumferential surface of the lower end of the molybdenum electrode 1. Under the cooling effect of the water cooling device, the molten glass powder is cooled to achieve complete sealing of the molybdenum electrode 1. Among them, the temperature monitoring system also uses a B-type thermocouple to ensure that the temperature of the main temperature monitoring point is less than 200°C.

[0035] Through the above description of the specific embodiment of the sealing device of the molybdenum electrode heating element of the substrate glass kiln of the present invention, it can be seen that the sealing device of the molybdenum electrode heating element of the substrate glass kiln of the present invention comprises a molybdenum electrode 1, a water cooling device, and a bottom brick layer 2 and a refractory material layer 3 arranged at the bottom of the kiln pool, and the molybdenum electrode 1 is used as a heating element; the water cooling device is used to prevent the molybdenum electrode 1 from oxidizing at high temperatures and ensure the stable operation of the molybdenum electrode 1; the bottom brick layer 2 and the refractory material layer 3 are provided with a stepped hole connected to the kiln pool, and the stepped position of the stepped hole is in the refractory material layer 3, which is used to cooperate with the water cooling device and the molybdenum electrode 1; the water cooling device is sleeved on the lower end of the molybdenum electrode 1 and inserted into the stepped hole so that the end face of the insertion end of the molybdenum electrode 1 is flush with the upper end face of the bottom brick, and the molybdenum electrode The end face of the insertion end of the electrode 1 is covered with an electric-fused high-zirconium brick 6 set in the kiln pool, and the electric-fused high-zirconium brick 6 is completely covered by the first broken glass powder 7, which is used to melt the first broken glass powder 7 so that it covers the upper surface of the molybdenum electrode 1, wherein there is glass liquid 14 in the kiln pool; a first sealing gap 4 is provided between the molybdenum electrode 1 and the inner circumferential surface of the step hole, and the height of the first sealing gap 4 is consistent with the thickness of the pool bottom brick layer 2, which is used to melt the first broken glass powder 7 so that it enters the first sealing gap 4 and covers the circumferential surface of the molybdenum electrode 1 after cooling; a second sealing gap 5 is provided between the molybdenum electrode 1 and the water cooling device, and a second broken glass powder 8 is provided between the upper end face of the water cooling device and the stepped position of the step hole, and the second broken glass powder 8 melts and covers the circumferential surface of the molybdenum electrode 1 corresponding to the second sealing gap 5.

[0036] The sealing device of the molybdenum electrode heating element of the substrate glass kiln of the present invention avoids oxidation damage to the molybdenum electrode heating element and avoids its influence on normal use function; in the process of raising the kiln liquid level, the complete covering of the surface of the molybdenum electrode 1 isolates the air from the contact with the molybdenum electrode 1, and prevents the oxidation volatilization of the molybdenum electrode 1 in an oxidizing atmosphere, creating better use conditions for the molybdenum electrode 1 in a reducing atmosphere; at the same time, the present invention systematically sets a sealing device during the heating process of the molybdenum electrode 1, so that the glass liquid completely covers the surface of the molybdenum electrode 1, and solves the problem that the molybdenum electrode 1 is very easy to be oxidized and volatilized when it is not completely covered by the glass liquid during the heating process of the kiln, and realizes the efficient and stable operation of the molybdenum electrode heating element.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A sealing device for a molybdenum electrode heating element of a substrate glass furnace, characterized in that: The invention comprises a molybdenum electrode (1), a water cooling device, and a bottom brick layer (2) and a refractory material layer (3) arranged at the bottom of a kiln pool, wherein the bottom brick layer (2) and the refractory material layer (3) are provided with a stepped hole connected to the kiln pool, and the stepped position of the stepped hole is located in the refractory material layer (3); the water cooling device is sleeved on the lower end of the molybdenum electrode (1) and inserted into the stepped hole so that the end surface of the insertion end of the molybdenum electrode (1) is flush with the upper end surface of the bottom brick layer (2), and the end surface of the insertion end of the molybdenum electrode (1) is covered with an electric fused high zirconium brick (6) arranged in the kiln pool, and the electric fused high zirconium brick (6) is covered with a first broken glass. The molybdenum electrode (1) is completely covered with glass powder (7); a first sealing gap (4) is provided between the molybdenum electrode (1) and the inner peripheral surface of the stepped hole, and the height of the first sealing gap (4) is consistent with the thickness of the pool bottom surface brick layer (2); a second sealing gap (5) is provided between the molybdenum electrode (1) and the water cooling device, and a second broken glass powder (8) is provided between the upper end surface of the water cooling device and the stepped position of the stepped hole. During the heating process, the first broken glass powder (7) melts and enters the first sealing gap (4), and the second broken glass powder (8) melts and enters the second sealing gap (5), thereby achieving complete sealing of the molybdenum electrode (1).

2. The sealing device of the molybdenum electrode heating element of the substrate glass furnace according to claim 1 is characterized in that: The spacing of the first sealing gap (4) is smaller than the spacing of the second sealing gap (5).

3. The sealing device of the molybdenum electrode heating element of the substrate glass furnace according to claim 2 is characterized in that: The spacing of the first sealing gap (4) is 1-3 mm, and the spacing of the second sealing gap (5) is 1-4 mm.

4. The sealing device for the molybdenum electrode heating element of the substrate glass furnace according to claim 1 is characterized in that: The water cooling device comprises a cooling water return pipeline (9) and a cooling water inlet pipeline (10), wherein the cooling water return pipeline (9) and the cooling water inlet pipeline (10) are arranged on opposite sides of the molybdenum electrode (1).

5. The sealing device for the molybdenum electrode heating element of the substrate glass furnace according to claim 4 is characterized in that: The sealing device further comprises a temperature detection system arranged in the water cooling device, and the temperature detection system is respectively arranged on a side of the cooling water return pipeline (9) away from the molybdenum electrode (1) and a side of the cooling water inlet pipeline (10) away from the molybdenum electrode (1), for detecting the temperature in the water cooling device.

6. The sealing device for the molybdenum electrode heating element of the substrate glass furnace according to claim 1, characterized in that: The raw materials of the first cullet (7) and the second cullet (8) are the same as the raw materials of the substrate glass, and the particle sizes of the first cullet (7) and the second cullet (8) are less than 1 mm.

7. The sealing device for the molybdenum electrode heating element of the substrate glass furnace according to claim 1, characterized in that: The molybdenum electrode (1) has a melting point of >2620°C and a density of >10.23 g / cm 3 , thermal expansion coefficient <5.1×10 -6 / ℃, critical current density is 0.4~0.7A / cm 2 .

8. The sealing device for the molybdenum electrode heating element of the substrate glass furnace according to claim 1, characterized in that: The pool bottom bricks in the pool bottom brick layer (2) are fused high zirconium bricks (6), and the density of the fused high zirconium bricks (6) is greater than 5.4 g / cm 3 The weight percentage of ZrO2 in the fused high zirconium brick (6) is greater than 95%, and the apparent porosity is less than 3%.

9. The sealing device for the molybdenum electrode heating element of the substrate glass furnace according to claim 1, characterized in that: The sealing device also includes a temperature monitoring system arranged at the lower end of the water cooling device, and a main temperature monitoring point is arranged at the lower end of the second sealing gap (5) and close to the molybdenum electrode (1), and the temperature monitoring system is used to monitor the temperature of the main temperature monitoring point.

10. A sealing method for a molybdenum electrode heating element of a substrate glass furnace, based on the sealing device for a molybdenum electrode heating element of a substrate glass furnace according to any one of claims 1 to 9, characterized in that: The steps include: S1, inserting a molybdenum electrode (1) provided with a water cooling device into a stepped hole, so that a first sealing gap (4) is provided between the molybdenum electrode (1) and the inner peripheral surface of the stepped hole, and a second sealing gap (5) is provided between the molybdenum electrode (1) and the water cooling device; S2, covering the end surface of the insertion end of the molybdenum electrode (1) with a fused high zirconium brick (6), and using a first cullet (7) to completely cover the fused high zirconium brick (6); at the same time, setting a second cullet (8) between the upper end surface of the water cooling device and the stepped position of the stepped hole; S3, the substrate glass furnace is heated up, and during the heating process, the first broken glass powder (7) melts and enters the first sealing gap (4), and the second broken glass powder (8) melts and enters the second sealing gap (5), thereby achieving complete sealing of the molybdenum electrode (1); wherein, a temperature monitoring system in the sealing device is used to monitor the temperature of a main temperature monitoring point arranged at the lower end of the second sealing gap (5) and close to the molybdenum electrode (1), to ensure that the temperature of the main temperature monitoring point is less than 200°C.

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