Float Electronic Display Glass Furnace and Melting Process

Abstract

In the glass manufacturing technology, this kiln comprises a melting section and a refining section connected in series, the width of the refining section being smaller than that of the melting section, a weir section between the refining section and the melting section, several electrodes A installed on the vessel wall and / or vessel bottom between the melting section and the refining section, and several burner lance holes for mounting burner lances installed on the battlement wall. The refining section and the melting section are separated by the weir section, so that the molten glass flow mainly in the silicate formation and glass formation stages of the melting process is controlled in the melting section, and the molten glass flow performing the fining process is controlled in the refining section. The ingredients are initially melted in the melting section, and the well-melted molten glass passes through the weir section of the kiln to enter the refining section for high-temperature refining, and then passes through the liquid flow holes to be classified, homogenized, and cooled, thereby achieving the melting of glass for electronic displays without the need for a platinum channel, significantly improving the service life of the kiln and the melting efficiency of the molten glass.

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application bearing application number 202410105648.9 and entitled "Kiln and Melting Process for High-Generation Float Electronic Display Glass," filed with the China Patent Office on January 25, 2024, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the field of glass manufacturing, and in particular to float electronic display glass furnace and melting processes. [Background technology]

[0003] The melting process of electronic display glass, which is an alkali-free, high-silicon, high-aluminum borosilicate glass, presents difficulties due to its high melting temperature, high viscosity of the molten glass, and difficulty in degassing during fining. To solve these problems, the industry has adopted a melting mode that involves initial melting in the kiln and finishing melting in the platinum channel. The role of the kiln is to initially melt the compounding materials, and then the well-melted molten glass enters the platinum channel from the bottom of the kiln for fining, homogenization, and cooling.

[0004] The furnace for electronic display glass uses a flame-electric mixed heating mode with pure oxygen combustion and electrode heating, and usually only has a melting tank without a working tank. The platinum passage is divided into functional stages such as the lifting stage, fining stage, stirring stage, cooling stage, and feeding stage, and is heated by electrical heating of platinum or platinum-rhodium alloy.

[0005] The main reasons for using platinum passageways are that they can heat molten glass after electricity is applied, maintain a certain level of mechanical strength at high temperatures, and do not contaminate the molten glass. However, platinum passageways are prone to creep fracture and breakage during the high-temperature fining process of molten glass, and their service life is typically only 2-3 years. In the production of glass for high-generation electronic displays, the platinum passageway has a shorter service life due to factors such as a greater tendency for creep fracture due to the larger diameter, and a greater tendency for breakage due to washing due to the larger volume of molten glass flow. Furthermore, a larger diameter platinum passageway causes the glass to heat unevenly, which affects the quality of the glass.

[0006] The mismatch between the platinum passage and the kiln's service life results in high costs, sometimes costing hundreds of millions of yuan, which seriously restricts electronic display glass manufacturers' efforts to reduce costs and improve efficiency. How to extend the service life of production lines while reducing costs has become a long-term issue for electronic display glass manufacturers. Summary of the Invention

[0007] The present application aims to provide a furnace and melting process for glass for float electronic displays to solve the technical problem of how to improve the service life and melting efficiency of the furnace for glass for float electronic displays.

[0008] The object of the present application can be achieved by the following technical means. A float process furnace for producing glass for electronic displays, comprising a melting section and a fining section connected in sequence, the width of the fining section being smaller than that of the melting section, and a weir section being provided between the fining section and the melting section, several electrodes A being provided on the tank wall and / or tank bottom between the melting section and the fining section, and several burner lance holes for attaching burner lances being provided on the breast wall, The float process furnace for glass for electronic displays further comprises a passage and a flow path, one end of the passage is connected to the rear end wall of the fining section and the other end is provided with a butt opening, the butt opening and the flow path inlet are connected via a butt step, and a gap is provided between the butt opening and the flow path inlet, and the passage is provided with a support mechanism for allowing the passage to slide freely on a main beam rail.

[0009] In a further aspect of the present application, the butt step comprises three sealing bricks arranged in a U-shape, with a cover brick on the ceiling thereof, the width of the sealing brick at the bottom of the butt step is the same as the width of the butt opening and the inlet of the flow path, the lower edges of the sealing bricks on both sides are on the same horizontal plane as the lower edge of the sealing brick at the bottom, and the upper edges of the sealing bricks on both sides are on the same horizontal plane as the upper surfaces of the butt opening and the inlet of the flow path, and the cover brick is attached to the upper sides of the sealing bricks on both sides, the butt opening and the inlet of the flow path.

[0010] In a further aspect of the present application, the cover brick is provided with a smoke exhaust hole, the smoke exhaust hole being located between the butt hole and the inlet of the flow channel.

[0011] In a further aspect of the present application, jackscrews are attached to all four sides of the sealing brick to adjust the gap between the butt opening and the inlet of the flow path, and jackscrews are also attached to the lower edges of the sealing bricks on both sides to adjust the vertical height of the sealing bricks on both sides.

[0012] In a further aspect of the present application, a front end wall of the melting section is provided with a flue and two or more inlets, and a rear end wall of the fining section is provided with liquid flow holes for circulating molten glass.

[0013] In a further aspect of the present application, the passage comprises a first cooling stage, a first stirring barrel, a connecting stage, a second stirring barrel, and a second cooling stage connected in sequence, the butt joint is connected to the other end of the second cooling stage, electrodes B are attached to the side walls of the first cooling stage, the connecting stage, and the second cooling stage, and heating wires are attached to the inside of all the bricks in the ceiling section, electrodes B are also attached to the side walls in the middle and lower parts of the first stirring barrel and the second stirring barrel that are completely covered with molten glass, and heating wires are attached to the inside of the bricks in the upper section that are not completely covered with glass.

[0014] In a further aspect of the present application, the first and second stirring barrels are provided with discharge holes at their bottoms, heating wires are attached to the inside of the bricks around the discharge holes, and heating covers are provided on the ceilings of the first and second stirring barrels.

[0015] 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.

[0016] A melting process using the above-mentioned float process furnace for electronic display glass as a melting furnace.

[0017] In a further aspect of the present application, it is necessary to carry out pre-production preparations before entering into the official production stage, and the pre-production preparations include (1) setting expansion, (2) preparing for kiln heating, (3) increasing the temperature of the kiln heating, and (4) preparing for drawing out the sheet glass; The setting of the expansion in (1) includes setting a connection point between the clarification section and the passageway as a fixed position, causing the melting section and the clarification section to expand from this fixed position toward the inlet, and causing the passageway to expand toward the flow path, (2) Preparation for kiln heating A: Installing a burner lance for heating the furnace at the inlet of the melting section and the burner lance holes in the melting section and clarification section, B: A temporary combustion gas exhaust device is installed in the smoke exhaust port and connected to the main flue of the kiln. C: sealing the first mixing tub and the second mixing tub; (3) The temperature increase of the kiln heating includes heating the kiln by using high-temperature combustion gas generated by the combustion of the kiln heating burner lance, and starting the temporary combustion gas exhaust device to draw and exhaust smoke. (4) Preparation for pulling out the glass sheets a: After the temperature of the melting section and the clarification section is raised, cullet and compounding materials are gradually added. As the molten glass level rises, the liquid flow holes are gradually blocked by the molten glass, and the amount of high-temperature combustion gas entering the passageway gradually decreases. At this time, the heating wires of each functional section of the passageway are turned on to compensate for the heat, ensuring the stability of the temperature of the passageway, or continuing to raise the temperature to the target temperature. b: When the molten glass liquid level is established, immediately adjust the amount of smoke exhaust from the smoke exhaust port, and when the liquid flow port is completely blocked, stop the smoke exhaust, remove the combustion gas exhaust device, seal the smoke exhaust port, and keep it warm; c: When the molten glass covers the electrode in a certain area, the electrode can be started to heat, and if there is a heating wire corresponding to this area, the heating wire can be stopped sequentially; d) When the molten glass level reaches a target height, the liquid level is observed and confirmed through the smoke exhaust port, and then the sheet glass is drawn out and formed.

[0018] Beneficial effects of this application: (1) In the float process electronic display glass furnace of the present invention, the fining section and the melting section are separated by a weir section, and the molten glass flow mainly in the silicate formation stage and glass formation stage of the melting process is controlled in the melting section, and the molten glass flow for the fining process is controlled in the fining section. The ingredients are initially melted in the melting section, and the well-melted molten glass passes through the weir section of the furnace to enter the fining section for high-temperature fining, and then passes through the liquid flow hole to enter the channel for classification, homogenization, and cooling, thereby realizing the melting of electronic display glass without a platinum channel, which greatly improves the service life of the furnace and prevents the deterioration of glass quality caused by the disturbance of the two main molten glass flows when the furnace process is unstable.

[0019] (2) The float process electronic display glass furnace of the present application uses a melting section instead of a conventional electronic display glass furnace, and a fining section instead of the platinum passage fining stage. Refractory materials such as electrofused zirconium corundum bricks, electrofused aluminum corundum bricks, and electrofused high-zirconium non-porous shrinkage bricks can all reach safe operating temperatures of 1700°C or higher, so the fining temperature has an extremely wide adjustment range, and the fining temperature of the furnace can be increased to the maximum extent according to production requirements.

[0020] (3) The float process furnace for electronic display glass according to the present invention can optimize and adjust the fuel gas blending ratio of the burner lance, the power distribution of the melting electric booster, and the energy ratio of the gas and electricity supply for each of the melting and fining sections. The melting and fining sections can also be adjusted as a single unit. This allows for a variety of adjustment methods, and optimal adjustment effects can be achieved for different situations.

[0021] (4) The present invention utilizes the characteristics of the long circulation time of the molten glass flow in the furnace and the large space occupied by the circulating molten glass flow, and the furnace is equipped with a melting section and a fining section, which greatly improves the residence time and space of the molten glass in the furnace, which is advantageous for discharging bubbles in the molten glass, and maximizes the fining effect.

[0022] (5) In the embodiment of the present application, the space of the fining section is much larger than that of the fining section of a conventional platinum channel, which makes it more resistant to adverse factors in fining, more stable the production process, and larger amounts of fining molten glass, further increasing the potential for improving production capacity.

[0023] (6) The melting process of the present invention uses electrode heating, which uses electrodes to pass electricity through the molten glass, and heat is generated due to the high resistance of the molten glass. This allows the molten glass to receive heat more uniformly, resulting in better homogenization and cooling, which further improves the glass quality and provides favorable conditions for subsequent forming.

[0024] The drawings described herein constitute a part of this application to provide a further understanding of the application, and the exemplary embodiments and descriptions thereof are intended to aid in the interpretation of the application and are not intended to unduly limit the application. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a structural schematic diagram of embodiment 1 of the present application. [Figure 2] FIG. 2 is a schematic cross-sectional view of a passage in the first embodiment of the present application. [Figure 3] FIG. 3 is a schematic cross-sectional view of the first stirring barrel / second stirring barrel in the first embodiment of the present application. [Figure 4] FIG. 4 is a schematic diagram showing how the butt port and the inlet of the channel are connected via a butt step in the first embodiment of the present application. [Figure 5] FIG. 5 is a schematic cross-sectional view of a butt step in the first embodiment of the present application. [Figure 6] FIG. 6 is a schematic diagram of combustion gas discharge in the first embodiment of the present application. [Figure 7] FIG. 7 is a schematic diagram of the state of the molten glass flow in the second embodiment of the present application. [Figure 8] FIG. 8 is a schematic diagram of a prior art electronic display glass furnace and molten glass flow conditions. DETAILED DESCRIPTION OF THE INVENTION

[0026] In order to clarify the objectives, technical means and advantages of the present invention, the present invention will be described in more detail below by giving examples with reference to the drawings. Obviously, the described examples are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0027] 1 to 4, Fig. 1 is a structural schematic diagram of Embodiment 1 of the present application, Fig. 2 is a cross-sectional schematic diagram of a passage in Embodiment 1 of the present application, Fig. 3 is a cross-sectional schematic diagram of a first stirring barrel / second stirring barrel in Embodiment 1 of the present application, and Fig. 4 is a schematic diagram of a connection between a butt port and a flow path inlet via a butt step in Embodiment 1 of the present application. As shown in Figs. 1, 2, and 4, the present application relates to a furnace for producing glass for electronic displays by the float process, which includes a melting section 1 and a refining section 2 connected in sequence, the width of the refining section 2 is smaller than that of the melting section 1, a weir section 201 is provided between the refining section 2 and the melting section 1, several electrodes A are provided on a vessel wall 706 and / or a vessel bottom 707 between the melting section 1 and the refining section 2, and several burner lance holes for attaching burner lances 6 are provided on a battlement wall 702, The float process furnace for producing glass for electronic displays further comprises a passage 3, one end of which is connected to the rear end wall 705 of the fining section 2 and the other end of which is provided with a butt opening 306, which is connected to the inlet of a flow path 5 leading to the tin groove via a butt step 4, with a gap 406 provided between the butt opening 306 and the inlet of the flow path 5, and a support mechanism 308 provided in the passage 3 to allow the passage 3 to slide freely on the main beam rail 8 when it expands due to temperature rise.

[0028] In actual production, the input and output of materials into the furnace are balanced. The molten glass in the furnace is formed into a circulating flow by the action of a preset temperature gradient. Taking advantage of the characteristics of the long circulation time of the molten glass flow in the furnace and the large space occupied by the circulating molten glass flow, the present invention provides a furnace with a melting section 1 and a fining section 2, which significantly increases the residence time and space of the molten glass in the furnace, favorable for the removal of bubbles in the molten glass, and maximizes the fining effect.

[0029] Specifically, the structures of melting section 1 and fining section 2 are similar to those of ordinary glass furnaces in the prior art, including a crown 701, a parapet 702, hook bricks 703, a front end wall 704, a rear end wall 705, a tank wall 706, and a tank bottom 707. Front end wall 704 of melting section 1 is provided with a flue 101 and an inlet 102, of which there are two or more, with the specific number being determined according to actual application requirements. Between melting section 2 and melting section 1, a weir section 201 is provided to separate the molten glass flows in melting section 1 and fining section 2. As the molten glass level in melting section 1 rises, the molten glass flow passes through weir section 201 and enters fining section 2. The provision of weir section 201 stabilizes the molten glass flow in fining section 2 and prevents fluctuations in process parameters caused by unstable material feeding or overall changes in the molten glass flow inside the furnace due to temperature fluctuations in melting section 1. At the same time, weir section 201 can also effectively prevent molten glass that is initially poorly melted in melting section 1 from flowing into fining section 2 and affecting the fining effect of the molten glass.

[0030] Since the width of the fining section 2 is slightly smaller than that of the melting section 1, it is possible to prevent the relatively cold molten glass near the vessel wall 706 of the melting section 1 from flowing into the fining section 2 and affecting the glass quality.

[0031] In the prior art, the overall length of a typical platinum passage is about 20 m, with the fining section having a diameter of 300-400 mm and a length of 6-7 m. In contrast, the dimensions of the fining section 2 of the furnace of the present application are width ≥ 2 m, length ≥ 6 m, and depth ≥ 1.2 m. The space of the fining section 2 of the present application is much larger than the fining section of a typical platinum passage, making it more resistant to adverse factors in fining, resulting in a more stable production process, a larger amount of fining molten glass, and greater potential for further improvement in production capacity.

[0032] A plurality of rollers 3081 are provided at the bottom of the support mechanism 308, and the passage 3 that expands due to a rise in temperature slides freely on the main beam rail 8 by the support mechanism 308 and the rollers 3081.

[0033] The crown 701, parapet 702, hook bricks 703, front end wall 704, rear end wall 705 and other parts are made of refractory materials such as electrofused zirconium ball bricks or electrofused aluminum ball bricks, and the tank wall 706, tank bottom 707 and weir section 201 are made of refractory materials such as electrofused high-zirconium non-porous bricks, which have high resistivity at high temperatures, good corrosion resistance and do not allow corrosive substances to contaminate the molten glass, thereby ensuring long-term safe operation in environments of 1600°C or above.

[0034] The vessel walls 706 and / or vessel bottom 707 of the melting section 1 and the refining section 2 are provided with several electrodes A. The electrodes A can be selected from tin oxide electrodes, molybdenum electrodes, platinum electrodes, etc., and the installation method can be selected according to the kiln's design tonnage. Bottom-inserted electrodes, sidewall block-shaped stacked electrodes, or a combination of bottom-inserted electrodes and sidewall block-shaped stacked electrodes can be selected. The bricks used for the vessel walls 706 and / or vessel bottom 707 are made of insulating material. The electrodes A are embedded in the vessel walls 706 and / or vessel bottom 707 of the melting section 1 and the refining section 2 and are in direct contact with the molten glass stream, utilizing the molten glass stream itself as a resistance heating element. The electrodes A introduce current into the molten glass stream to heat it.

[0035] The battlements 702 of the melting section 1 and the fining section 2 are provided with several burner lance holes for installing burner lances 6, which can be selected as pure oxygen burner lances or kiln heating burner lances, and the high-temperature combustion gases generated by the combustion of the burner lances 6 are used to heat the kiln and increase the temperature, thereby heating the molten glass flow.

[0036] The passage 3 comprises a first cooling stage 301, a first stirring barrel 302, a connecting stage 303, a second stirring barrel 304, and a second cooling stage 305, which are connected in sequence. The first cooling stage 301 is connected to the rear end wall 705 of the refining section 2, which is provided with liquid flow holes 202. The molten glass refined in the refining section 2 enters the first cooling stage 301 through the liquid flow holes 202. The molten glass is cooled to a temperature suitable for stirring in the first cooling stage 301, enters the first stirring barrel 302, and is stirred and homogenized in the first stirring barrel 302. The molten glass then passes through the connecting stage 303 and enters the second stirring barrel 304, where it is stirred and homogenized again, and finally enters the second cooling stage 305, where it is cooled to a temperature suitable for forming in a tin bath.

[0037] As shown in Figures 1 to 3, electrodes B are attached to the side walls of the first cooling stage 301, the connecting stage 303 and the second cooling stage 305, and heating wires are attached inside each of the bricks in the ceiling section. The heating wires are combined to form heating bricks 307, and electricity is passed through the heating bricks 307 formed by the combination of the heating wires, thereby achieving heating compensation during the temperature rise stage of kiln heating.

[0038] Both the first stirring barrel 302 and the second stirring barrel 304 are equipped with metal stirring rods 309 for stirring and homogenizing the molten glass. The two stirring barrels are installed to classify and homogenize the molten glass. Electrodes B for heating the molten glass are also attached to the side walls of the middle and lower sections of the first stirring barrel 302 and the second stirring barrel 304 that are completely covered with molten glass. Heating wires are attached to the interior of the bricks above that are not completely covered with glass. The combination of the bricks and heating wires forms heating bricks 307, which heat the upper spaces of the first stirring barrel 302 and the second stirring barrel 304. Discharge holes 310 are provided at the bottom of the first stirring barrel 302 and the second stirring barrel 304, and heating wires are attached to the interior of the bricks around the discharge holes 310. The discharge holes 310 are primarily used for discharge, controlling the discharge amount, and maintaining the discharge temperature. The ceilings of the first mixing vessel 302 and the second mixing vessel 304 have the same structure as the heating covers 311 for mixing vessels used in the industry, that is, they are covered with a refractory material and then heated by passing electricity through them, which prevents cold spots from forming in the upper space of the mixing vessels and affecting the homogenization effect.

[0039] The bodies of the first cooling stage 301, first stirring barrel 302, connecting stage 303, second stirring barrel 304, and second cooling stage 305 are all made of refractory materials such as electrofused high-zirconium non-porous shrink bricks, which can reach a safe operating temperature of over 1700°C. This allows for a wide adjustment range of the fining temperature, allowing the kiln's fining temperature to be maximized according to production requirements. By using electrode heating to heat the molten glass, it is possible to melt glass for electronic displays without a platinum passageway, compared to the prior art, which uses a platinum passageway to heat the molten glass by passing electricity through the platinum body, and this effectively extends the service life of the passageway 3. The support mechanisms 308 for the first cooling stage 301, first stirring barrel 302, connecting stage 303, second stirring barrel 304, and second cooling stage 305 slide freely on the main beam rail 8, ensuring that the expansion of the kiln during heating is not hindered. Electrode B in passage 3 is a tin oxide electrode because the shape of the tin oxide electrode can be tailored to suit individual needs. Using electrode B in passage 3 allows the molten glass to be heated more uniformly, which is beneficial for glass homogenization and facilitates more stable control of the flow rate of molten glass.

[0040] As shown in Figures 1 and 4, a channel 5 is connected to the other end of the passage 3. A butt joint 306 is connected to the end of the second cooling stage 305, away from the second stirring barrel 304. The butt joint 306 and the inlet of the channel 5 are connected via a butt joint stage 4, with a gap 406 between the butt joint 306 and the inlet of the channel 5. Before officially starting production, the kiln is heated according to a specific heating curve to prevent the bricks from bursting due to rapid cooling or heating. During the heating process, the refractory material expands. The gap 406 between the butt joint 306 and the inlet of the channel 5 serves as a concentrated expansion gap, preventing bursting due to the refractory material extruding. However, the amount of expansion cannot be accurately controlled, and it is difficult to ensure accurate bonding with the channel 5 after expansion is complete. Therefore, a butt joint stage 4 is installed to seal the gap 406 between the butt joint 306 and the channel 5 and prevent leakage of molten glass.

[0041] Specifically, a supporting steel structure 404 is provided at the bottom of the butt opening 306 and the butt stage 4. During the heating process of the kiln, the passage 3 expands toward the butt stage 4 on the main beam rail 8 by the support mechanism 308 and rollers 3081, the butt stage 4 maintains its position due to the fixed support of the supporting steel structure 404, and the butt opening 306 moves slightly in the gap 406 inside the butt stage 4.

[0042] Referring to FIG. 5, FIG. 5 is a cross-sectional schematic diagram of a butt step in Embodiment 1 of the present application. As shown in FIG. 5, the butt step 4 includes three sealing bricks 401 arranged in a U-shape, with a cover brick 402 installed on the ceiling. The butt opening 306 and the inlet of the flow path 5 are stacked on the bottom sealing brick 401, with a gap 406 between them. The width of the bottom sealing brick 401 of the butt step 4 is the same as the width of the butt opening 306 and the inlet of the flow path 5. The lower edges of the sealing bricks 401 on both sides are flush with the lower edge of the bottom sealing brick 401, and the upper edges of the sealing bricks 401 on both sides are flush with the upper surfaces of the butt opening 306 and the inlet of the flow path 5. The cover brick 402 can be attached to the upper sides of the sealing bricks 401 on both sides, the butt opening 306, and the inlet of the flow path 5.

[0043] Referring to FIG. 6, FIG. 6 is a schematic diagram of combustion gas exhaust in Embodiment 1 of the present application. As shown in FIGS. 4 to 6, the cover brick 402 is provided with a flue 403. The flue 403 is located between the butt joint 306 and the inlet of the flow passage 5, i.e., above the gap 406. It is used to exhaust high-temperature combustion gases generated by the burner lance 6 when the kiln is heated with hot air. After the kiln is heated, the flue 403 must be sealed to maintain heat. During actual production, the flue 403 can be opened as needed to inspect the internal condition of the butt joint 4. Jackscrews 405 are attached to all four sides of the sealing brick 401 to adjust the gap 406 between the butt joint 306 and the inlet of the flow passage 5. These jackscrews are slightly loosened during heating to prevent the expansion of the passage 3 and the flow passage 5 from being hindered. After the expansion is completed due to heating, all jackscrews 405 are tightened to completely seal the pre-set gaps. Jack screws 405 are also attached to the lower edges of the sealing bricks 401 on both sides to adjust the vertical height of the sealing bricks 401 on both sides. On the one hand, this prevents the weight of the cover bricks 402 from being fully applied to the butt hole 306 and the inlet of the flow passage 5 during heating, thereby preventing the expansion of the passage 3. On the other hand, if the upper edge of the sealing brick 401 is misaligned with the butt hole 306 and the inlet of the flow passage 5, it is convenient to adjust the height of the sealing brick 401, thereby ensuring that the cover bricks 402 are attached to the butt hole 306 and the inlet of the flow passage 5.

[0044] As shown in Figure 6, the process of exhausting combustion gas from the kiln is as follows:

[0045] During the kiln heating process, some of the combustion gases generated by the burner lances in the melting section 1 and the fining section 2 enter the flue 101 directly, and some are introduced into the temporary flue from the flue exhaust port 403 by the micro suction fan via passage 3, and finally merge into the flue 101. All of the combustion gases are finally drawn from the flue 101 by the main suction fan to the flue 101, where they are purified in the flue gas treatment system and discharged from the chimney.

[0046] During the production process, the combustion gases enter the flue 101 directly, are purified by the combustion gas treatment system, and are discharged from the chimney.

[0047] Example 2 Referring to Fig. 7, Fig. 7 is a schematic diagram of the state of molten glass flow in Embodiment 2 of the present application. As shown in Fig. 7, the present application discloses a melting process in which the above-mentioned float process electronic display glass furnace is used as a display glass furnace that integrates melting, fining, homogenization, and cooling without using or using a small amount of precious metals, and the steps of the process are as follows:

[0048] Step 1: Pre-production preparation (1) Expansion setting: The connection point between the clarification section 2 and the passage 3 is set as a fixed position, and the melting section 1 and the clarification section 2 expand from this fixed position toward the inlet 102, and the passage 3 expands toward the flow path 5. (2) Preparation for kiln heating: A: Burner lances 6 for heating the furnace are provided at the inlet 102 of the melting section 1, the burner lance holes of the melting section 1, and the burner lance holes of the fining section 2. B: A temporary combustion gas exhaust device is installed in the smoke exhaust port 403 and connected to the main flue of the kiln. C: The first mixing vessel 302 and the second mixing vessel 304 are sealed. (3) Heating the kiln: The kiln is heated using high-temperature combustion gas generated by the combustion of the kiln heating burner lance 6, and the temporary combustion gas exhaust device is activated to draw out and exhaust the smoke.

[0049] The burner lances 6 include a kiln heating burner lance 6 and a pure oxygen burner lance 6, and in the preparation stage for the kiln heating, the inlet 102 is not used to charge materials but to attach the kiln heating burner lance 6, and the burner lance holes in the melting section 1 and the clarification section 2 are also used to attach the kiln heating burner lances 6 for heating the kiln and raising its temperature.

[0050] When the temperature of the kiln reaches a certain level, the combustion gases generated by the combustion of the kiln heating burner lance 6 cannot continue to raise the temperature of the kiln, so the kiln heating burner lance 6 attached to the inlet 102 is removed, the inlet 102 is temporarily blocked with thermal cotton, and the kiln heating burner lances 6 attached to the burner lance holes in the melting section 1 and the clarification section 2 are removed and replaced with pure oxygen burner lances 6. When the temperature inside the kiln reaches a level at which the cullet can be melted, the thermal cotton is removed and the cullet etc. is fed into the inlet 102 by a feeder to melt the glass.

[0051] (4) Preparation for drawing out the glass plates: a: After the temperature rise of the melting section 1 and the clarification section 2 is completed, cullet and compounding materials are gradually added. As the molten glass level rises, the liquid flow holes 202 are gradually blocked by the molten glass, and the amount of high-temperature combustion gas entering the passage 3 gradually decreases. At this time, the heating wires of each functional stage of the passage 3 are turned on to compensate for the heat, so as to ensure the temperature stability of the passage 3 or continue to rise to the target temperature. b: Once the molten glass liquid level is established, immediately adjust the amount of smoke exhaust from the smoke exhaust port 403. When the liquid flow port 202 is completely blocked, stop the smoke exhaust and remove the combustion gas exhaust device so as not to affect the temperature rise of the passage 3. After removing the combustion gas exhaust device, seal the smoke exhaust port 403 and keep it warm. c: When the molten glass covers the electrode in a certain area, the electrode can start to heat, and if there is a heating wire corresponding to this area, the heating wire will be stopped sequentially. d: When the molten glass level reaches the target height and is confirmed by observing the level through the smoke exhaust port 403, the glass can be blended, shaped, and drawn out. Specifically, the liquid level position after the molten glass level is established is detected by a level gauge. If the liquid level is not established, the conditions for using a level gauge are not met, and the depth can be measured by inserting a platinum probe or a quartz glass rod into the molten glass.

[0052] Step 2: Production According to the distribution ratio that electrical energy accounts for more than 50% of the total energy in the melting and fining sections, the fuel gas ratio of each pair of burner lances and the power of each pair of electrodes are reasonably distributed based on experience, and a temperature regime is set based on experience, forming a basic energy distribution system.

[0053] Referring to Figure 8, Figure 8 is a schematic diagram of a conventional electronic display glass furnace and molten glass flow. As shown in Figure 8, in the conventional technology, platinum passages serve as functional stages such as pulling, fining, stirring, cooling, and supply stages, and platinum (or a platinum-rhodium alloy) is heated by electrical heating. Conventional platinum passages are small in volume and vulnerable to fluctuations in external environmental factors, which can easily interfere with the glass fining effect. Furthermore, the platinum passage heats the molten glass by electrical heating of the platinum body, which can easily create a temperature difference between the molten glass in contact with the platinum body and the molten glass in the center of the platinum passage, affecting the temperature uniformity of the molten glass.

[0054] The float process furnace for electronic display glass according to the present invention uses a melting section instead of a conventional furnace for electronic display glass, and a fining section instead of the platinum passage fining stage. The melting process of the float process furnace for electronic display glass according to the present invention focuses on fining section 2. The barrier of weir section 201 controls the molten glass flow that mainly performs the melting process to melting section 1, and the molten glass flow that performs the fining process to fining section. The ingredients are initially melted in melting section 1, and the well-melted molten glass passes through weir section 201 to enter fining section 2 for high-temperature fining, and then passes through liquid flow hole 202 to enter passage 3 for classification, homogenization, and cooling, thereby achieving melting of electronic display glass without a platinum passage. The main bodies of the first cooling stage 301, first stirring barrel 302, connecting stage 303, second stirring barrel 304, and second cooling stage 305 that make up passage 3 are all made of refractory materials such as electrofused high-zirconium non-porous bricks, which can reach a safe operating temperature of over 1700°C, allowing the furnace fining temperature to be maximized according to production requirements. Heating the molten glass through electrode heating enables the melting of glass for electronic displays without the need for a platinum passage, effectively extending the service life of passage 3.

[0055] In this description, terms indicating directions or positions, such as "up," "down," "left," and "right," are based on the directions or positions shown in the drawings. This is for ease of explanation and simplification only. These terms do not necessarily indicate or imply that a device or element necessarily has a particular orientation or is configured and operated in a particular orientation, and should not be understood as limiting the scope of this application. Furthermore, terms such as "first," "second," and the like are for descriptive purposes only and should not be understood as indicating or implying the relative importance or the number of the indicated technical features. Therefore, a feature qualified as "first" or "second" can explicitly or implicitly include one or more features. In this description, unless otherwise specified, "plurality" means two or more than two.

[0056] In the description of this application, the terms "attach," "connect," and "couple" should be understood in a broad sense unless otherwise clearly defined. For example, they may be fixedly connected, detachably connected, or integrally connected. They may be mechanically connected or electrically connected. They may be directly connected or indirectly connected via an intermediate medium. Two elements may be internally connected. Those skilled in the art will be able to understand the specific meanings of the above terms in this application depending on the specific situation.

[0057] The above description is merely a preferred embodiment of the present application, and does not limit the present application. Any amendments, equivalent replacements, modifications, etc. made within the spirit and principles of the present application shall be included in the scope of the present application. [Explanation of symbols]

[0058] Melting section 1, flue 101, inlet 102, clarification section 2, weir section 201, liquid flow hole 202, passage 3, first cooling stage 301, first stirring barrel 302, connecting stage 303, second stirring barrel 304, second cooling stage 305, butt port 306, heating bricks 307, support mechanism 308, rollers 3081, metal stirring rod 309, discharge hole 310, heating cover 311, butt stage 4, sealing bricks 401, cover bricks 402, smoke exhaust hole 403, supporting steel structure 404, jackscrew 405, gap 406, flow path 5, burner lance 6, crown 701, parapet 702, hook bricks 703, front end wall 704, rear end wall 705, tank wall 706, tank bottom 707, main beam rail 8.

Claims

1. A furnace for producing glass for a float process electronic display, comprising a melting section (1) and a fining section (2) connected in series, the width of the fining section (2) being smaller than that of the melting section (1), and a weir section (201) being provided between the fining section (2) and the melting section (1), several electrodes A being provided on the tank wall (706) and / or the tank bottom (707) between the melting section (1) and the fining section (2), and several burner lance holes for attaching burner lances (6) being provided on the parapet (702), The float process furnace for producing glass for electronic displays further comprises a passage (3), one end of which is connected to the rear end wall (705) of the fining section (2) and the other end of which is provided with a butt opening (306), the butt opening (306) and the inlet of a flow path (5) leading to a tin groove are connected via a butt step (4), and a gap (406) is provided between the butt opening (306) and the inlet of the flow path (5), and the passage (3) is provided with a support mechanism (308) for allowing the passage (3), which has expanded due to temperature rise, to slide freely on the main beam rail (8). A furnace for producing glass for float-processed electronic displays, characterized by:

2. The butt step (4) has three sealing bricks (401) surrounded by a U-shape, and a cover brick (402) is provided on the ceiling thereof. The width of the sealing brick (401) at the bottom of the butt step (4) is the same as the width of the butt opening (306) and the inlet of the flow path (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). The upper edges of the sealing bricks (401) on both sides are on the same horizontal plane as the upper surfaces of the butt opening (306) and the inlet of the flow path (5). The cover brick (402) is attached to the upper sides of the sealing bricks (401) on both sides, the butt opening (306), and the inlet of the flow path (5).

2. The float process furnace for producing glass for electronic displays according to claim 1.

3. The cover brick is provided with a smoke exhaust hole (403), and the smoke exhaust hole (403) is located between the butt hole (306) and the inlet of the flow path (5).

3. The float process furnace for producing glass for electronic displays according to claim 2.

4. Jack screws (405) are attached to all four sides of the sealing brick (401) to adjust the gap between the butt joint (306) and the inlet of the flow path (5), and jack screws (405) are also attached to the lower edges of the sealing bricks (401) on both sides to adjust the vertical height of the sealing bricks (401) on both sides.

4. The float process furnace for producing glass for electronic displays according to claim 3.

5. The front end wall (704) of the melting section (1) is provided with a flue (101) and two or more inlets (102), and the rear end wall (705) of the fining section (2) is provided with liquid flow holes (202) for circulating molten glass.

2. The float process furnace for producing glass for electronic displays according to claim 1.

6. The passage (3) comprises a first cooling stage (301), a first stirring tub (302), a connecting stage (303), a second stirring tub (304), and a second cooling stage (305) connected in this order, and the butt joint (306) is connected to the other end of the second cooling stage (305). Electrodes B are attached to the side walls of the first cooling stage (301), the connecting stage (303), and the second cooling stage (305), and heating wires are attached to the inside of the bricks in the ceiling. Electrodes B are also attached to the side walls in the middle and lower parts of the first stirring tub (302) and the second stirring tub (304) that are completely covered with molten glass, and heating wires are attached to the inside of the bricks in the upper parts that are not completely covered with molten glass.

2. The float process furnace for producing glass for electronic displays according to claim 1.

7. The first and second stirring tubs (302, 304) have a discharge hole (310) at the bottom, a heating wire is attached to the inside of the bricks around the discharge hole (310), and a heating cover (311) is provided on the ceiling of the first and second stirring tubs (302, 304).

7. A furnace for producing glass for electronic displays by the float method according to claim 6.

8. The electrode A is a tin oxide electrode, a molybdenum electrode, or a platinum electrode, and the electrode B is a tin oxide electrode.

7. A furnace for producing glass for electronic displays by the float method according to claim 6.

9. The float process furnace for electronic display glass according to any one of claims 1 to 8 is used as a furnace for display glass that integrates melting, fining, homogenization, and cooling, and does not use or uses a small amount of precious metals. A melting process characterized by:

10. Before the official production stage, pre-production preparations must be carried out. (1) setting the expansion; (2) preparing the furnace for heating; (3) increasing the temperature of the furnace; and (4) preparing to pull out the glass sheets. The setting of the expansion (1) includes setting a connection point between the clarification section (2) and the passage (3) as a fixed position, expanding the melting section (1) and the clarification section (2) from this fixed position toward the inlet (102), and expanding the passage (3) toward the flow path (5), (2) Preparation for kiln heating A: Installing a furnace heating burner lance (6) at the inlet (102) of the melting section (1) and at the burner lance holes of the melting section (1) and the fining section (2); B: A temporary combustion gas exhaust device is provided in the smoke exhaust port (403) and connected to the main flue of the kiln; C: sealing the first mixing tub (302) and the second mixing tub (304); (3) The temperature increase of the kiln heating includes heating the kiln by using high-temperature combustion gas generated by the combustion of the kiln heating burner lance (6) to increase the temperature, and starting the temporary combustion gas exhaust device to draw and exhaust smoke. The above (4) preparation for drawing out the glass sheet is a: After the temperature of the melting section (1) and the clarification section (2) is completed, gradually add cullet and compounding materials. As the molten glass level rises, the liquid flow hole (202) is gradually blocked by the molten glass, and the amount of high-temperature combustion gas entering the passage (3) gradually decreases. At this time, turn on the heating wires of each functional section of the passage (3) to compensate for the heat, and ensure the temperature stability of the passage, or continue to heat up to the target temperature. b: When the molten glass liquid level is established, immediately adjust the amount of smoke exhausted from the smoke exhaust hole (403), and when the liquid flow hole (202) is completely blocked, stop the smoke exhaust, remove the combustion gas exhaust device, and seal and keep the smoke exhaust hole (403) warm; c: When the molten glass covers the electrode in a certain area, the electrode can be started to heat, and if there is a heating wire corresponding to this area, the heating wire can be stopped sequentially; d: When the molten glass level reaches the target height, the liquid level is observed and confirmed through the smoke exhaust hole (403), and then the plate glass is drawn out and formed. Contains 10. The melting process according to claim 9, characterized in that

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