Electronic display float glass kiln and melting process

Abstract

An electronic display float glass kiln, and a melting process, relating to the technical field of glass manufacturing. The kiln comprises a melting section and a refining section connected in sequence, the width of the refining section being smaller than that of the melting section, and a kiln ridge being disposed between the refining section and the melting section; the tank walls and / or tank bottoms of the melting section and the refining section are provided with multiple electrodes A, and a breast wall is provided with multiple burner ports used to mount burners; the refining section and the melting section are separated by the kiln ridge, and in a melting process, a liquid flow mainly undergoing silicate formation and glass formation is controlled within the melting section, while a liquid flow undergoing a refining process is controlled within the refining section; in the melting section, batch materials are preliminarily melted, then liquid glass having good pre-melting enters the refining section via the kiln ridge for high-temperature refining, and subsequently enters a channel through a liquid flow hole for graded homogenization and cooling, which enables the melting of electronic display glass without a platinum channel, greatly improving the service life of the kiln and the melting effect of the liquid glass.

Description

A float electronic display glass kiln and melting process

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 25, 2024, with application number 202410105648.9 and invention name “A high-generation float electronic display glass kiln and melting process”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of glass manufacturing technology, and in particular to a float glass furnace and melting process for electronic display glass. Background Art

[0003] Electronic display glass is alkali-free, high-silicon, and high-aluminum borosilicate glass. Its melting process presents challenges including high melting temperatures, high glass viscosity, and difficulty in clarification and degassing. To address these challenges, the industry has adopted a melting method that combines pre-melting in a kiln with fine melting in a platinum channel. The kiln performs the initial melting of the batch materials, and the well-pre-melted glass flows from the bottom of the kiln into the platinum channel for clarification, homogenization, and cooling.

[0004] Electronic display glass furnaces utilize a flame-electric hybrid heating system combining pure oxygen combustion with electrode heating. They typically consist of a melting pool with no working pool. The platinum channel is divided into functional sections, including the lifting, clarification, stirring, cooling, and feeding sections. Heating is achieved through the electrical heating of platinum or a platinum-rhodium alloy.

[0005] The main reason for using platinum channels is that they can heat the molten glass when powered, have a certain mechanical strength at high temperatures, and do not contaminate the molten glass. However, platinum channels are prone to creep collapse or damage during the high-temperature clarification of the molten glass, and their service life is typically only 2-3 years. In the production of high-generation electronic display glass, the service life of platinum channels is even shorter due to reasons such as the larger diameter of the platinum channel, which is more prone to creep collapse, and the larger flow rate of the molten glass, which is more prone to erosion and damage. In addition, the larger the diameter of the platinum channel, the more likely it is to cause uneven heating of the glass, affecting the glass quality.

[0006] The lifespan of platinum channels and kilns is significantly mismatched, and the high investment, often hundreds of millions of RMB, severely hinders electronic display glass manufacturers' ability to reduce costs and increase efficiency. Reducing investment while extending the lifespan of production lines has become a long-standing concern for electronic display glass manufacturers.

[0007] Summary of the Invention

[0008] The purpose of this application is to provide a float glass furnace and melting process for electronic display glass to solve the following technical problems:

[0009] How to improve the service life and melting effect of float glass furnace for electronic display.

[0010] The purpose of this application can be achieved through the following technical solutions:

[0011] A float glass furnace for electronic display, comprising a melting section and a clarifier section connected in sequence, wherein the width of the clarifier section is smaller than that of the melting section, and a kiln sill is provided between the clarifier section and the melting section; a plurality of electrodes A are provided on the walls and / or bottom of the melting section and the clarifier section, and a plurality of lance holes are provided on the breast wall for installing lances; and further comprising:

[0012] The channel and the flow channel, one end of the channel is connected to the rear gable of the clarification part, and the other end is provided with a docking port, the docking port is connected to the inlet of the flow channel through a docking section, and a gap is reserved between the docking port and the inlet of the flow channel; the channel is provided with a supporting mechanism to drive the channel to slide freely on the main beam track.

[0013] In a further solution of the present application: the docking section includes three U-shaped sealing bricks, with a cover brick on the top; the width of the sealing brick at the bottom of the docking section is consistent with the width of the docking port and the flow channel inlet; the lower edges of the sealing bricks on both sides are on the same horizontal plane as the lower edge of the bottom sealing brick, and the upper edges of the sealing bricks on both sides are on the same horizontal plane as the upper surface of the docking port and the flow channel inlet; the cover brick can be fitted with the upper sides of the sealing bricks on both sides, the docking port, and the flow channel inlet.

[0014] In a further solution of the present application: a smoke exhaust hole is provided on the cover brick, and the smoke exhaust hole is located between the docking port and the flow channel inlet.

[0015] In a further solution of the present application: the sealing brick is equipped with top screws all around to adjust the gap between the docking port and the flow channel inlet; the lower edges of the sealing bricks on both sides are also equipped with top screws to adjust the upper and lower heights of the sealing bricks on both sides.

[0016] In a further solution of the present application: a flue and two or more feeding ports are provided on the front gable of the melting section; and a liquid flow hole is provided on the rear gable of the clarification section for circulating the molten glass.

[0017] In a further solution of the present application: the channel includes a cooling section 1, a stirring barrel 1, a connecting section, a stirring barrel 2 and a cooling section 2 connected in sequence, and the connecting port is connected to the other end of the cooling section 2; electrodes B are installed on the side walls of the cooling section 1, the connecting section and the cooling section 2, and heating wires are installed in the top bricks; electrodes B are also installed on the side walls of the middle and lower parts of the stirring barrel 1 and the stirring barrel 2 that are completely covered by the glass liquid, and heating wires are installed inside the bricks whose upper parts are not completely covered by glass.

[0018] In a further solution of the present application: a discharge hole is provided at the bottom of the mixing barrel 1 and the mixing barrel 2, and a heating wire is installed inside the brick material around the discharge hole; a heating cover is provided at the top of the mixing barrel 1 and the mixing barrel 2.

[0019] In a further embodiment of the present application: the electrode A is a tin oxide electrode, a molybdenum electrode or a platinum electrode; and the electrode B is a tin oxide electrode.

[0020] A melting process uses the float glass furnace for electronic display glass as a melting furnace.

[0021] In a further solution of this application: pre-production preparation is required before the formal production stage, and the pre-production preparation includes:

[0022] (1) Expansion setting: The junction of the clarification part and the channel is used as a fixed position, and the melting part and the clarification part expand toward the feeding port from this point, and the channel expands toward the flow channel;

[0023] (2) Kiln preparation:

[0024] A: The kiln burner is installed in the feeding port of the melting section and the burner holes of the melting section and the clarification section;

[0025] B: Install temporary flue gas exhaust equipment on the exhaust hole and connect it to the main flue of the kiln;

[0026] C: Seal mixing tank 1 and mixing tank 2;

[0027] (3) Kiln heating: Use the high-temperature flue gas generated by the kiln burner to heat the kiln, and start the temporary flue gas exhaust equipment to drain and exhaust the smoke;

[0028] (4) Preparation of lead plate:

[0029] a: After the melting and clarification sections have finished heating up, cullet and batch materials are added in stages. As the glass level rises, the flow hole is gradually blocked by the glass liquid, and the high-temperature flue gas entering the channel continues to decrease. At this time, the heating wires of each functional section of the channel are turned on for heat compensation to ensure that the channel temperature is stable or continues to rise to the target temperature;

[0030] b: When establishing the glass liquid level, timely adjust the exhaust volume of the exhaust hole. When the flow hole is completely blocked, stop exhausting the smoke and remove the smoke exhaust equipment, seal and insulate the exhaust hole;

[0031] c: When the glass liquid covers the electrode in a certain area, the electrode heating can be started. If there is a corresponding heating wire in this area, the heating wire will be gradually shut down;

[0032] d: When the glass liquid level reaches the target height and is confirmed to be correct through observation of the smoke exhaust hole, the forming guide plate can be used.

[0033] Beneficial effects of this application:

[0034] (1) The clarification section and the melting section of the float glass kiln of the present application are separated by a kiln sill. During the melting process, the liquid flow in the silicate formation and glass formation stages is controlled in the melting section, and the liquid flow in the clarification process is controlled in the clarification section. The batch material is preliminarily melted in the melting section, and the pre-melted glass liquid enters the clarification section through the kiln sill for high-temperature clarification. Thereafter, it enters the channel through the flow hole for graded homogenization and cooling. This can realize the melting of electronic display glass without a platinum channel, greatly improve the service life of the kiln, and at the same time avoid the deterioration of glass quality caused by the turbulence of the two main glass liquid flows when the kiln process fluctuates.

[0035] (2) In the present application, the float glass furnace uses a melting section to replace the conventional glass furnace, and uses a clarification section to replace the platinum channel clarification section. Since refractory materials such as fused zirconium corundum bricks, fused aluminum corundum bricks, and fused high zirconium shrinkage-free bricks can reach a safe operating temperature of more than 1700°C, there is a great deal of room for adjustment of the clarification temperature, and the clarification temperature of the furnace can be increased to the maximum extent according to production needs.

[0036] (3) The float glass furnace of the present application can optimize and adjust the burner gas ratio of the melting section and the clarification section, the electric melting power distribution, and the energy ratio of the gas and electricity supply respectively. It can also adjust the melting section and the clarification section in an integrated manner. The adjustment means are diversified and can achieve the best adjustment effect for different working conditions.

[0037] (4) The present application utilizes the characteristics of long circulation time of the glass liquid flow in the kiln and large space occupied by the circulating liquid flow. The kiln includes a melting section and a clarification section, so the time and space for the glass liquid to stay in the kiln are greatly increased, which is conducive to the discharge of bubbles in the glass liquid and can maximize the clarification effect.

[0038] (5) In some embodiments of the present application, the space of the clarification section is much larger than that of the conventional platinum channel clarification section, which is more resistant to adverse factors affecting clarification, the production process is more stable, and the amount of clarified glass liquid is greater, which has great potential for further increasing production capacity.

[0039] (6) The melting process of the present application adopts electrode heating, which is to use electrodes to energize the glass liquid and rely on the high resistance of the glass liquid to generate heat. Therefore, the glass liquid is heated more evenly, which is conducive to better homogenization and cooling, thereby improving the quality of the glass and providing favorable conditions for subsequent molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0041] FIG1 is a schematic structural diagram of Example 1 of the present application;

[0042] FIG2 is a schematic cross-sectional view of the channel in Example 1 of the present application;

[0043] FIG3 is a schematic cross-sectional view of the mixing barrel 1 / mixing barrel 2 in Example 1 of the present application;

[0044] FIG4 is a schematic diagram of the connection between the docking port and the flow channel inlet through the docking stage in Example 1 of the present application;

[0045] FIG5 is a cross-sectional schematic diagram of the docking section in Example 1 of the present application;

[0046] FIG6 is a schematic diagram of smoke emission in Example 1 of the present application;

[0047] FIG7 is a schematic diagram of the state of the glass liquid flow in Example 2 of the present application;

[0048] FIG8 is a schematic diagram of an electronic display of a glass furnace and glass liquid flow status in the prior art.

[0049] Description of reference numerals:

[0050] Melting section 1; flue 101; feeding port 102; clarification section 2; kiln sill 201; liquid flow hole 202; channel 3; cooling section 1 301; stirring barrel 1 302; connecting section 303; stirring barrel 2 304; cooling section 2 305; docking port 306; heating tile 307; supporting mechanism 308; roller 3081; metal stirring rod 309; discharge hole 310; heating cover 311; docking section 4; sealing brick 401; cover brick 402; smoke exhaust hole 403; supporting steel structure 404; top screw 405; gap 406; flow channel 5; burning gun 6; crown 701; breast wall 702; hook brick 703; front gable 704; rear gable 705; pool wall 706; pool bottom 707; main beam track 8. DETAILED DESCRIPTION

[0051] To make the objectives, technical solutions, and advantages of this application more clearly understood, the present application is further described below with reference to the accompanying drawings and examples. It is apparent that the described examples are only a portion of the embodiments of this application, and not all of them. All other embodiments derived by persons of ordinary skill in the art based on the examples in this application are intended to fall within the scope of protection of this application.

[0052] Referring to Figures 1 to 4, Figure 1 is a schematic structural diagram of Example 1 of the present application; Figure 2 is a schematic cross-sectional diagram of the channel in Example 1 of the present application; Figure 3 is a schematic cross-sectional diagram of the stirring barrel 1 / stirring barrel 2 in Example 1 of the present application; and Figure 4 is a schematic diagram of the connection between the docking port and the flow channel inlet through the docking stage in Example 1 of the present application. As shown in Figures 1, 2, and 4, the present application is a float glass furnace for electronic display, comprising a melting section 1 and a clarification section 2 connected in sequence, the width of the clarification section 2 being smaller than the width of the melting section 1, and a kiln sill 201 being provided between the clarification section 2 and the melting section 1; a plurality of electrodes A are provided on the pool wall 706 and / or pool bottom 707 of the melting section 1 and the clarification section 2, and a plurality of burner holes are provided on the breast wall 702 for installing the burner 6;

[0053] It also includes: a channel 3, one end of which is connected to the rear gable 705 of the clarification part 2, and the other end is provided with a docking port 306, the docking port 306 is connected to the entrance of the flow channel 5 leading to the tin bath through a docking section 4, and a gap 406 is reserved between the docking port 306 and the entrance 305 of the flow channel 5; the channel 3 is provided with a support mechanism 308, which is used to drive the channel 3 that expands due to temperature increase to slide freely on the main beam track 8.

[0054] In actual production, the kiln's feed and discharge rates are balanced. The molten glass inside the kiln forms a circulation flow under the influence of a preset temperature gradient. This application utilizes the long circulation time and large space occupied by the molten glass flow within the kiln. The kiln comprises a melting section 1 and a clarification section 2. This significantly increases the time and space the molten glass remains within the kiln, facilitating the removal of bubbles from the molten glass and maximizing the clarification effect.

[0055] Specifically, the structures of the melting section 1 and the clarification section 2 are similar to those of conventional glass kilns in the prior art, including a roof 701, a breast wall 702, hook bricks 703, a front gable 704, a rear gable 705, a pool wall 706, a pool bottom 707 and other structures; a flue 101 and a feeding port 102 are provided on the front gable 704 of the melting section 1, and the number of feeding ports 102 is not less than 2, and the specific number is determined according to actual application requirements; a kiln ridge 201 is provided between the clarification section 2 and the melting section 1 to separate the glass liquid flow of the melting section 1 and the clarification section 2. As the glass liquid level in the melting section 1 rises, the glass liquid flow will cross the kiln ridge 201 and enter the clarification section 2. The provision of the kiln sill 201 can stabilize the liquid flow in the clarification section 2, thereby avoiding fluctuations in process parameters caused by overall changes in the glass liquid flow inside the kiln due to unstable feeding or temperature fluctuations in the melting section 1; at the same time, the kiln sill 201 can also effectively prevent poorly pre-melted glass liquid in the melting section 1 from entering the clarification section 2 and affecting the clarification effect of the glass liquid.

[0056] The width of the clarification part 2 is slightly smaller than that of the melting part 1 , which can prevent the colder glass liquid near the pool wall 706 of the melting part 1 from flowing into the clarification part 2 and affecting the glass quality.

[0057] Conventional platinum channels are approximately 20 meters long, with the clarifier section measuring 300-400 mm in diameter and 6-7 meters in length. The clarifier section 2 of the kiln in this application, on the other hand, has dimensions of ≥2 meters in width, ≥6 meters in length, and approximately 1.2 meters in depth. This clarifier section 2, with a significantly larger footprint than conventional platinum channel clarifier sections, is more resistant to adverse factors affecting clarification, resulting in a more stable production process and the ability to clarify larger amounts of molten glass, offering significant potential for further increases in production capacity.

[0058] A plurality of rollers 3081 are provided at the bottom of the support mechanism 308 , and the channel 3 that expands due to temperature increase slides freely on the main beam track 8 based on the support mechanism 308 and the rollers 3081 .

[0059] Refractory materials such as fused zirconium corundum bricks or fused aluminum corundum bricks are selected for the arch top 701, breast wall 702, hook bricks 703, front gable 704, and rear gable 705. Refractory materials such as fused high-zirconium shrinkage-free bricks with high high-temperature resistivity, good corrosion resistance, and no contamination of molten glass by corrosive substances are selected for the pool wall 706, pool bottom 707, and kiln sill 201, to ensure long-term safe operation in an environment above 1600°C.

[0060] The walls 706 and / or bottom 707 of the melting section 1 and clarification section 2 are provided with a plurality of electrodes A. Electrodes A can be made of tin oxide, molybdenum, or platinum. The installation method is selected based on the designed tonnage of the kiln. Bottom-inserted electrodes, sidewall block-stacked electrodes, or a combination of bottom-inserted and sidewall block-stacked electrodes can be used. The bricks used for the walls 706 and / or bottom 707 of the kiln are made of insulating material. The electrodes A are embedded in the walls 706 and / or bottom 707 of the melting section 1 and clarification section 2, in direct contact with the molten glass flow. The glass flow itself acts as a resistive heating element, and current is introduced into the glass flow through the electrodes A to achieve heating of the glass flow.

[0061] A number of burner holes are provided on the breast wall 702 of the melting section 1 and the clarification section 2 for installing burners 6. The burners 6 can be pure oxygen burners or kiln burners. The high-temperature flue gas generated by the combustion of the burners 6 is used to bake and heat the kiln, thereby heating the glass liquid flow.

[0062] The channel 3 includes a cooling section 1 301, a stirring barrel 1 302, a connecting section 303, a stirring barrel 2 304 and a cooling section 2 305 connected in sequence, wherein the cooling section 1 301 is connected to the rear gable 705 of the clarification section 2, and a liquid flow hole 202 is provided on the rear gable 705 of the clarification section 2. The glass liquid after being clarified well in the clarification section 2 enters the cooling section 1 301 through the liquid flow hole 202; the glass liquid is cooled to a temperature suitable for stirring in the cooling section 1 301 and then enters the stirring barrel 1 302. After being stirred and homogenized in the stirring barrel 1 302, it enters the stirring barrel 2 304 through the connecting section 303 and is stirred and homogenized again, and finally enters the cooling section 2 305 to be cooled to a temperature suitable for tin bath molding.

[0063] As shown in Figures 1 to 3, electrodes B are installed on the side walls of cooling section 1 301, connecting section 303 and cooling section 2 305, and heating wires are installed in the top bricks. The heating wire combination forms a heating tile 307. The heating tile 307 formed by the heating wire combination is energized to achieve heating compensation during the kiln heating stage.

[0064] Metal stirring rods 309 are installed in both stirring barrel 1 302 and stirring barrel 2 304 for stirring and homogenizing the glass liquid; the purpose of setting up two stirring barrels is to grade and homogenize the glass liquid; electrodes B are also installed on the side walls of the middle and lower parts of stirring barrel 1 302 and stirring barrel 2 304 that are completely covered by the glass liquid to heat the glass liquid; and heating wires are installed inside the bricks on the upper part that are not completely covered by the glass, and the bricks and the heating wires form heating tiles 307 for heating the upper space of stirring barrel 1 302 and stirring barrel 2 304; a discharge hole 310 is provided at the bottom of stirring barrel 1 302 and stirring barrel 2 304, and heating wires are installed inside the bricks around the discharge hole 310, which are mainly used for unloading, controlling the discharge amount and ensuring the discharge temperature. The tops of mixing barrel 1 302 and mixing barrel 2 304 adopt the same structure as the mixing barrel heating cover 311 used in the industry, that is, the refractory material is wrapped with precious metal skin and then electrically heated, which can avoid the formation of cold spots in the upper space of the mixing barrel, affecting the homogenization effect.

[0065] The main bodies of the cooling section 1 301, stirring barrel 1 302, connecting section 303, stirring barrel 2 304, and cooling section 2 305 are all made of refractory materials such as fused high-zirconium shrinkage-free bricks, capable of reaching a safe operating temperature of over 1700°C. This allows for significant adjustment of the clarification temperature, allowing the kiln's clarification temperature to be maximized based on production needs. Electrode heating of the molten glass, compared to the prior art method of using platinum channels, where the platinum body is electrically heated to heat the molten glass, enables electronic display glass melting without platinum channels, effectively extending the service life of channel 3. The support mechanism 308 of the cooling section 1 301, stirring barrel 1 302, connecting section 303, stirring barrel 2 304, and cooling section 2 305 can slide freely on the main beam rail 8, ensuring unimpeded expansion of the kiln during heating. Electrode B in channel 3 is a tin oxide electrode because its shape can be customized as needed. Using electrode B in channel 3 allows for more uniform heating of the molten glass, which is beneficial for glass homogenization and facilitates more stable control of the molten glass flow rate.

[0066] As shown in Figures 1 and 4, the other end of the channel 3 is connected to the flow channel 5, wherein the end of the cooling section 2 305 away from the mixing barrel 2 304 is connected to the docking port 306, and the docking port 306 is connected to the inlet of the flow channel 5 through the docking section 4, and a gap 406 is reserved between the docking port 306 and the inlet of the flow channel 5; the kiln must be baked and heated according to a certain heating curve before normal production to avoid sudden cooling and heating that may cause the bricks to burst. During the heating process, the refractory material will expand. At this time, the gap 406 reserved between the docking port 306 and the inlet of the flow channel 5 can provide a concentrated expansion joint for the expansion to avoid the refractory materials from being squeezed against each other and causing bursting; but the amount of expansion cannot be accurately controlled, and it is difficult to ensure precise fit with the flow channel 5 after the expansion is completed. Therefore, a docking section 4 is provided to seal the gap 406 between the docking port 306 and the flow channel 5 to avoid leakage of the glass liquid.

[0067] Specifically, a supporting steel structure 404 is provided at the bottom of the sealed docking port 306 and the docking section 4. During the kiln heating process, the channel 3 expands on the main beam track 8 toward the docking section 4 based on the supporting mechanism 308 and the roller 3081. The docking section 4 remains stationary under the fixed support of the supporting steel structure 404, and the sealed docking port 306 moves slightly in the gap 406 inside the docking section 4.

[0068] Refer to Figure 5, which is a cross-sectional schematic diagram of the docking section in Example 1 of the present application. As shown in Figure 5, the docking section 4 includes three U-shaped sealing bricks 401, with a cover brick 402 on top. The docking port 306 and the inlet of the flow channel 5 are built on the bottom sealing brick 401 with a gap 406 reserved between them. The width of the sealing brick 401 at the bottom of the docking section 4 is consistent with the width of the docking port 306 and the inlet of the flow channel 5. The lower edges of the sealing bricks 401 on both sides are on the same horizontal plane as the lower edge of the bottom sealing brick 401, and the upper edges of the sealing bricks 401 on both sides are on the same horizontal plane as the upper surface of the docking port 306 and the inlet of the flow channel 5. The cover brick 402 can be attached to the upper sides of the sealing bricks 401 on both sides, the docking port 306, and the inlet of the flow channel 5.

[0069] Refer to Figure 6, which is a schematic diagram of smoke emission in Example 1 of the present application. As shown in Figures 4 to 6, the cover brick 402 is provided with a smoke exhaust hole 403, which is located between the docking port 306 and the inlet of the flow channel 5, that is, above the gap 406, and is used to discharge the high-temperature smoke generated by the burner 6 during hot air kiln baking. The smoke exhaust hole 403 needs to be sealed and insulated after the kiln baking is completed; in formal production, if necessary, the smoke exhaust hole 403 can be opened to check the internal working condition of the docking section 4; the sealing brick 401 is equipped with top screws 405 on all sides to adjust the gap 406 between the docking port 306 and the inlet of the flow channel 5, which is slightly loose when the kiln is heated to prevent obstruction of the channel. 3 and the expansion of the flow channel 5; after the temperature increase and expansion are completed, all the top screws 405 are tightened to completely seal the reserved gap; top screws 405 are also installed on the lower edges of the sealing bricks 401 on both sides to adjust the upper and lower heights of the sealing bricks 401 on both sides; on the one hand, it is to prevent the weight of the cover brick 402 from being completely pressed on the docking port 306 and the inlet of the flow channel 5 during the temperature increase process, thereby affecting the expansion of the channel 3; on the other hand, when the upper edge of the sealing brick 401 is misaligned with the docking port 306 and the inlet of the flow channel 5, it is convenient to adjust the height of the sealing brick 401 to ensure that the cover brick 402 can fit the docking port 306 and the inlet of the flow channel 5.

[0070] As shown in Figure 6, the fume emission process of the kiln is as follows:

[0071] During the kiln baking process: part of the flue gas generated by the burners in the melting section 1 and the clarification section 2 directly enters the flue 101, and part of it passes through the channel 3 and is introduced into the temporary flue from the exhaust hole 403 under the action of the micro induced draft fan, and finally merges into the flue 101. All the flue gas is finally discharged from the chimney through the flue 101 through the flue gas treatment system under the action of the main induced draft fan.

[0072] During the production process: the flue gas directly enters the flue 101, is purified by the flue gas treatment system and then discharged from the chimney.

[0073] Example 2

[0074] See Figure 7, which is a schematic diagram of the glass liquid flow state in Example 2 of the present application. As shown in Figure 7, the present application discloses a melting process, using the float glass furnace described above as a display glass furnace that integrates melting, clarification, homogenization, and cooling without using or using a small amount of precious metals. The process steps are as follows:

[0075] Step 1: Preparation before production

[0076] (1) Expansion setting: The junction of the clarification section 2 and the channel 3 is used as a fixed position, and the melting section 1 and the clarification section 2 expand from this point toward the feeding port 102, and the channel 3 expands toward the flow channel 5;

[0077] (2) Kiln preparation:

[0078] A: The kiln burner 6 is installed at the feeding port 102 of the melting part 1, the burner hole and the burner hole of the clarification part 2;

[0079] B: Install temporary smoke exhaust equipment on smoke exhaust hole 403 and connect it to the main smoke duct of the kiln;

[0080] C: Seal mixing tank 1 302 and mixing tank 2 304;

[0081] (3) Kiln heating: The kiln is heated by using the high-temperature flue gas generated by the kiln burner 6, and the temporary flue gas exhaust equipment is started to drain and exhaust the smoke;

[0082] It should be noted that the burners 6 include a kiln burner 6 and a pure oxygen burner 6. During the kiln preparation stage, the charging port 102 is not used for charging materials and is used to install the kiln burner 6. The burner holes of the melting section 1 and the clarification section 2 are also equipped with kiln burners 6 to heat the kiln.

[0083] When the kiln temperature reaches a certain level, the smoke generated by the burning of the kiln burner 6 cannot make the kiln continue to heat up. The kiln burner 6 at the feeding port 102 is removed, and the feeding port 102 is temporarily blocked with thermal insulation cotton. The kiln burner 6 at the burner holes of the melting part 1 and the clarification part 2 is removed and replaced with a pure oxygen burner 6. When the temperature in the kiln reaches a level that can melt the cullet, the thermal insulation cotton is removed, and the feeder adds materials, such as cullet, from the feeding port 102, and then the glass is melted.

[0084] (4) Preparation of lead plate:

[0085] a: After the melting section 1 and the clarifier section 2 have finished heating, cullet and batch materials are added in stages to establish the liquid level in preparation for normal production. As the glass level rises, the flow hole 202 is gradually blocked by the glass liquid, and the high-temperature flue gas entering the channel 3 is continuously reduced. At this time, the heating wires of each functional section of the channel 3 are turned on for heat compensation to ensure that the temperature of the channel 3 is stable or continues to rise to the target temperature.

[0086] b: When the glass liquid level is established, the exhaust volume of the smoke exhaust hole 403 is adjusted in time. When the liquid flow hole 202 is completely blocked, the smoke exhaust is stopped and the smoke exhaust equipment is removed to avoid affecting the temperature rise of channel 3. After removing the smoke exhaust equipment, the smoke exhaust hole 403 is sealed and insulated;

[0087] c: When the glass liquid covers the electrode in a certain area, the electrode heating can be started. If there is a corresponding heating wire in this area, the heating wire will be gradually shut down;

[0088] d: When the glass liquid level reaches the target height and is confirmed to be correct through the smoke exhaust hole 403, the forming guide plate can be used.

[0089] Specifically, the liquid level position after the glass liquid level is established is detected by a liquid level gauge. When the liquid level is not established, the conditions for using a liquid level gauge are not met, and a platinum probe or a quartz glass rod can be inserted into the glass liquid to measure its depth.

[0090] Step 2: Production Stage

[0091] According to the distribution ratio of electric energy to more than 50% of the total energy of the melting and clarification sections, the gas ratio of each pair of burners and the power of each group of electrodes are reasonably distributed according to experience, and the temperature system is formulated according to experience to form a preliminary energy distribution system.

[0092] See Figure 8, which is a schematic diagram of an electronic display of a glass furnace and glass flow in the prior art. As shown in Figure 8, in the prior art, platinum channels serve as the lifting, clarification, stirring, cooling, and feeding sections, respectively, using platinum (or a platinum-rhodium alloy) as a heating method. Conventional platinum channels are small in size and have poor resistance to fluctuations in external environmental factors, making the glass clarification effect easily affected. Furthermore, the platinum channels heat the glass by heating the platinum body, which easily creates a temperature difference between the glass in contact with the platinum body and the glass in the center of the platinum channel, affecting the temperature uniformity of the glass.

[0093] The float glass furnace for electronic display glass in this application replaces conventional electronic display glass furnaces with a melting section and replaces the platinum channel clarification section with a clarification section. The melting process in this float glass furnace requires the hotspot to be located in clarification section 2. A kiln sill 201 is used to block the flow of glass liquid, primarily for the melting process, within the melting section 1, while the flow of glass liquid for the clarification process is controlled within clarification section 2. The batch material undergoes initial melting in the melting section 1. Pre-melted, high-quality glass liquid passes through the kiln sill 201 and enters clarification section 2 for high-temperature clarification. It then flows through flow holes 202 into channel 3 for graded homogenization and cooling, achieving electronic display glass melting without a platinum channel. The cooling section 1 (301), stirring barrel 1 (302), connecting section 303, stirring barrel 2 (304), and cooling section 2 (305) that comprise channel 3 are all constructed of refractory materials such as fused high-zirconium, shrinkage-free bricks, achieving a safe operating temperature exceeding 1700°C. The kiln's clarification temperature can be increased to the maximum possible level based on production needs. By heating the glass liquid by electrode heating, the electronic display glass melting without a platinum channel can be realized, which can effectively extend the service life of the channel 3.

[0094] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, and a specific orientation structure and operation. Therefore, it cannot be understood as a limitation on this application. In addition, "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "multiple" means two or more.

[0095] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0096] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A float electronic display glass furnace, characterized in that, It includes a melting section (1) and a fining section (2) connected in sequence. The width of the fining section (2) is smaller than that of the melting section (1), and a weir (201) is provided between the fining section (2) and the melting section (1); a number of electrodes A are provided on the sidewalls (706) and / or the bottom (707) of the melting section (1) and the fining section (2), and a number of burner holes are provided on the breast wall (702) for installing burners (6); it further includes: A channel (3), one end of the channel (3) is connected to the rear wall (705) of the fining section (2), and the other end is provided with a docking port (306). The docking port (306) is connected to the inlet of a runner (5) leading to a tin bath through a docking section (4), and a gap (406) is reserved between the docking port (306) and the inlet (305) of the runner (5); a support mechanism (308) is provided on the channel (3) to drive the channel (3) that expands due to heating to slide freely on the main beam track (8).

2. The float electronic display glass furnace according to claim 1, characterized in that, The docking section (4) includes three sealing bricks (401) that enclose to form a U shape, and a cover brick (402) is provided on its top; the width of the sealing brick (401) at the bottom of the docking section (4) is the same as the widths of the docking port (306) and the inlet of the runner (5); the lower edges of the sealing bricks (401) on both sides are on the same horizontal plane as the lower edge of the bottom sealing brick (401), and the upper edges of the sealing bricks (401) on both sides are on the same horizontal plane as the upper surfaces of the docking port (306) and the inlet of the runner (5); the cover brick (402) can be attached to the upper sides of the sealing bricks (401) on both sides, the docking port (306), and the inlet of the runner (5).

3. The float electronic display glass furnace according to claim 2, characterized in that, A smoke exhaust hole (403) is provided on the cover brick, and the smoke exhaust hole (403) is located between the docking port (306) and the inlet of the runner (5).

4. The float electronic display glass furnace according to claim 3, wherein, Top screws (405) are installed around the sealing brick (401) to adjust the gap between the docking port (306) and the inlet of the runner (5); top screws (405) are also installed on the lower edges of the sealing bricks (401) on both sides to adjust the vertical height of the sealing bricks (401) on both sides.

5. The float electronic display glass furnace according to claim 1, wherein A flue (101) and more than two feeding ports (102) are provided on the front wall (704) of the melting section (1); a glass discharge hole (202) is provided on the rear wall (705) of the fining section (2) for the glass liquid to flow through.

6. The float electronic display glass furnace according to claim 1, characterized in that, The channel (3) includes a first cooling section (301), a first stirring barrel (302), a connecting section (303), a second stirring barrel (304), and a second cooling section (305) connected in sequence. The docking port (306) is connected to the other end of the second cooling section (305); electrodes B are installed on the sidewalls of the first cooling section (301), the connecting section (303), and the second cooling section (305), and heating wires are installed inside the top bricks; electrodes B are also installed on the sidewalls of the first stirring barrel (302) and the second stirring barrel (304) that are completely covered by the glass liquid in the middle and lower parts, and heating wires are installed inside the bricks in the upper parts that are not completely covered by the glass.

7. The float electronic display glass furnace according to claim 6, characterized in that, The bottoms of the first stirring barrel (302) and the second stirring barrel (304) are provided with discharge holes (310), and heating wires are installed inside the bricks around the discharge holes (310); the tops of the first stirring barrel (302) and the second stirring barrel (304) are provided with heating covers (311).

8. The float electronic display glass furnace according to claim 6, characterized in that, The electrode A is a tin oxide electrode, a molybdenum electrode or a platinum electrode; the electrode B is a tin oxide electrode.

9. A melting process, characterized in that, The float electronic display glass furnace as described in any one of claims 1-8 is used as a display glass furnace that integrates melting, clarification, homogenization and cooling without using or using a small amount of precious metals.

10. The melting process according to claim 9, characterized in that, Before the formal production stage, preparations before production are required. The preparations before production include: (1) Expansion setting: Taking the connection between the clarification section (2) and the channel (3) as a fixed position, the melting section (1) and the clarification section (2) expand towards the charging port (102) from this starting point, and the channel (3) expands towards the runner (5). (2) Kiln baking preparation: A: The kiln baking burners (6) are installed in the charging port (102) of the melting section (1) and the burner holes of the melting section (1) and the clarification section (2). B: Install temporary flue gas discharge equipment on the smoke exhaust holes (403) and connect it to the main flue of the furnace. C: Seal the first stirring barrel (302) and the second stirring barrel (304). (3) Kiln baking temperature rise: Use the high-temperature flue gas generated by the combustion of the kiln baking burners (6) to bake and raise the temperature of the furnace, and start the temporary flue gas discharge equipment for diversion and smoke exhaust. (4) Plate drawing preparation: a: After the temperature rise of the melting section (1) and the clarification section (2) is completed, cullet and batch materials are fed in stages. As the glass liquid level rises, the flow hole (202) is gradually blocked by the glass liquid, and the high-temperature flue gas entering the channel (3) continuously decreases. At this time, turn on the heating wires of each functional section of the channel (3) for heat compensation to ensure the channel temperature is stable or continues to rise to the target temperature. b: When establishing the glass liquid level, timely adjust the smoke exhaust volume of the smoke exhaust holes (403). When the flow hole (202) is completely blocked, stop smoke exhaust and remove the flue gas discharge equipment, and seal and heat-insulate the smoke exhaust holes (403). c: When the glass liquid covers a certain area of the electrode, the electrode heating can be started. If there is a corresponding heating wire in this area, gradually turn off the heating wire. d: When the glass liquid level reaches the target height and it is confirmed through the smoke exhaust holes (403) that the liquid level position is correct, the plate can be drawn in cooperation with the forming.

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