A float glass cullet box waste discharge device

Abstract

The utility model relates to the field of float glass preparation, concretely relates to a kind of float glass slag box exhaust device, through groove is set in the top surface of the entry end of annealing lehr, chimney pipe is vertically set in the top of the annealing lehr, one end of the chimney pipe is welded to communicate with the through groove, the height of the chimney pipe is limited to 5m~8m, the inner diameter is 200mm~250mm, by ingenious chimney pipe position selection and chimney pipe structure design, the exhaust gas in slag box can be efficiently discharged, sufficient suction is ensured, the generation of oxide and sulfide and other attachments of tin on roll surface is effectively reduced, the cleanliness of production glass surface is ensured, the chimney effect is used to discharge exhaust gas naturally, the cost is lower, easy to control, the high quality of glass is ensured.

Description

Technical Field

[0001] This utility model relates to the field of float glass preparation, and specifically to a float glass slag box waste discharge device. Background Technology

[0002] Float glass is a type of flat glass produced using the float process. In this process, molten glass is introduced into a bath filled with high-temperature liquid tin. Because the density of molten glass is less than that of molten tin, it floats on the surface of the tin. Under the influence of gravity and surface tension, the glass spreads into a uniformly thick, flat glass strip. This strip then enters an annealing furnace for cooling and annealing, and finally undergoes cutting and processing to form float glass. Float glass has advantages such as high flatness, high transparency, high compressive strength, and good heat resistance, and is widely used in construction, automobiles, furniture, home appliances, solar energy, electronics, decoration, precision electronics, and special buildings.

[0003] In some production processes, a slag box is connected to the rear end of the tin bath, and the slag box is adjacent to the inlet of the annealing furnace. A transition roller is installed inside the slag box, which primarily ensures a smooth transition of the glass ribbon from the tin bath to the annealing furnace. In the tin bath, molten glass combines with molten tin and protective gases (such as hydrogen and nitrogen) to form a complex multiphase system. Due to the differences between the phase components and the high temperature, oxidation-reduction reactions occur, leading to the formation of tin oxides and sulfides. If the waste gas generated in the tin bath cannot be effectively discharged, tin oxides and sulfur oxides will adhere to the surface of the transition roller in the slag box. When the glass ribbon passes through, this will cause surface defects such as scratches, clumps of adhesive, and imprints on the bottom surface of the glass ribbon, affecting the continuous production of high-quality glass.

[0004] Currently, the exhaust gas in the slag box is mainly discharged through the gap between the slag box and the annealing furnace. When the exhaust gas discharge efficiency is low, it is difficult to ensure the cleanliness of the transition roller surface inside the slag box. Some factories install pipes in the gap between the slag box and the annealing furnace, and then use the A-zone fan to centrally discharge the exhaust gas through the pipes. This method is not only energy-intensive and increases costs, but the sulfur dioxide emitted in the pipes also pollutes the atmosphere. As the fan is the source of suction power, the airflow in the slag box is affected as the fan frequency increases, causing defects such as flared edges and micro-deformation on the glass edges, affecting product quality. Utility Model Content

[0005] The purpose of this invention is to overcome the problems existing in the float glass production process, such as low exhaust efficiency of waste gas from the slag box, high exhaust cost, or difficulty in controlling airflow during exhaust, which can cause minor defects in the glass strip. This invention provides a waste gas discharge device for float glass slag boxes. This device uses a chimney pipe to naturally discharge waste gas using the chimney effect. The chimney pipe is positioned on the top surface of the inlet end of the annealing furnace. Through clever selection of the chimney inlet position and chimney pipe structure design, sufficient suction is ensured, enabling efficient discharge of waste gas from the slag box. This effectively reduces the generation of tin oxides and sulfides on the roller surface, ensuring the cleanliness of the lower surface of the produced glass.

[0006] In a first aspect, the present invention provides a float glass slag box waste discharge device, including a through groove disposed on the top surface of the inlet end of an annealing furnace, wherein the annealing furnace is connected adjacent to the slag box.

[0007] It also includes a chimney pipe, which is erected on the top of the annealing kiln, and one end of the chimney pipe is welded to the through groove. The height of the chimney pipe is 5m to 8m, and the inner diameter is 200mm to 250mm; Each chimney pipe is equipped with an airflow regulating valve, and a diagonal brace is connected to the outer wall of the chimney pipe. The end of the diagonal brace away from the chimney pipe is welded to the annealing kiln. A sealing structure is arranged at the connection between the chimney pipe and the through groove. An adsorption layer is provided inside the end of the chimney pipe away from the annealing kiln.

[0008] The float glass slag box waste discharge device provided by this utility model has a through groove set on the top surface of the inlet end of the annealing furnace, and a chimney pipe is erected on the top of the annealing furnace. One end of the chimney pipe is welded to the through groove. The height of the chimney pipe is limited to 5m to 8m and the inner diameter is 200mm to 250mm. By cleverly selecting the chimney inlet position and designing the chimney pipe structure, sufficient suction is ensured so that the waste gas in the slag box can be discharged efficiently. This effectively reduces the generation of tin oxides and sulfides and other deposits on the roller surface, ensuring the cleanliness of the lower surface of the produced glass. The waste gas is discharged naturally by utilizing the chimney effect, which is low-cost and easy to control, thereby ensuring the continuous production of high-quality glass.

[0009] As a preferred embodiment of this invention, the airflow inside the slag box is 2000-2500m. 3 / h.

[0010] As a preferred embodiment of this utility model, the chimney pipe has a cylindrical structure. The cylindrical structure facilitates the smooth flow of flue gas inside, reduces resistance, and improves exhaust efficiency; furthermore, the relatively smooth inner surface of the cylinder is not conducive to the deposition of soot, which is beneficial to the emission of flue gas and the cleaning of the chimney.

[0011] As a preferred embodiment of this utility model, the height of the chimney pipe is 6m to 8m, and the inner diameter is 220mm to 250mm. Research has found that setting the height and inner diameter within a specific ratio range ensures sufficient exhaust suction force in the chimney pipe, guaranteeing stable and natural discharge of exhaust gas.

[0012] As a preferred embodiment of this utility model, 5 to 7 chimney pipes are spaced apart along the width direction on the top surface of the annealing furnace inlet end. In cases where the slag box has a narrow waste discharge space, a large amount of heat enters the annealing furnace, making it difficult to reduce the heat of the thick plate core and reduce the stress on the glass plate; finished glass is prone to breakage, horizontal slag formation, fogging, uneven rounding, poor edge cleaning, spontaneous cracking in the storage area, and difficulty in cutting. In thin plate production, the edge heat is too low, resulting in "lotus leaf" edges; finished glass is prone to large curvature, incomplete edges and corners, and poor cutting quality. The production of both thin and thick plates is unstable, with poor cutting performance and edge quality, failing to meet high customer standards and affecting market competitiveness. This application provides 5-7 chimney pipes spaced apart along the width direction of the top surface of the annealing furnace inlet end. By controlling the different exhaust volumes of the multiple chimney pipes, the quality of the glass can be guaranteed.

[0013] As a preferred embodiment of this invention, each chimney pipe is equipped with an airflow regulating valve. The airflow regulating valve enables precise control of the airflow magnitude of the exhaust gas within the chimney pipe.

[0014] As a preferred embodiment of this utility model, a diagonal brace is connected to the outer wall of the chimney pipe, and the end of the diagonal brace away from the chimney pipe is welded to the annealing kiln. The diagonal brace can better ensure the structural stability of the chimney pipe.

[0015] As a preferred embodiment of this utility model, a sealing structure is arranged at the connection between the chimney pipe and the through groove. The sealing structure effectively prevents exhaust gas leakage, ensures a clean production environment and worker health, and also helps improve production efficiency and product quality.

[0016] In a preferred embodiment of this invention, an adsorption layer is provided inside the end of the chimney pipe furthest from the annealing kiln. The adsorption layer effectively adsorbs harmful substances in the exhaust gas, such as sulfur dioxide, thereby reducing the amount of pollutants emitted into the environment. In some embodiments, the adsorption layer may be made of activated carbon, molecular sieves, silica gel, glass fiber, ceramic fiber, etc.

[0017] As a preferred embodiment of this invention, the thickness of the adsorption layer is 20cm to 30cm. A suitable thickness provides a larger adsorption area, ensuring that harmful gases are fully adsorbed, extending the service life of the adsorption material, reducing replacement frequency, and simultaneously ensuring appropriate resistance when gas passes through, thereby improving adsorption efficiency.

[0018] As a preferred embodiment of this utility model, the side of the chimney pipe furthest from the annealing furnace is provided with a drawer structure that can be pushed and pulled inwards and outwards. The bottom surface of the drawer structure is a mesh structure, and the drawer structure is used to place the adsorbent material. The drawer structure can be easily pushed and pulled, making the replacement and maintenance of the adsorbent material easier, eliminating the need for machine downtime for maintenance, and improving production efficiency.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: The float glass slag box waste discharge device provided by this utility model has a through groove set on the top surface of the inlet end of the annealing furnace, and a chimney pipe is erected on the top of the annealing furnace. One end of the chimney pipe is welded to the through groove. The height of the chimney pipe is limited to 5m to 8m and the inner diameter is 200mm to 250mm. Through the clever selection of the chimney pipe position and the chimney pipe structure design, the waste gas in the slag box can be discharged efficiently, ensuring sufficient suction force, effectively reducing the generation of tin oxides and sulfides and other deposits on the roller surface, ensuring the cleanliness of the lower surface of the produced glass, and utilizing the chimney effect to discharge the waste gas naturally. It has low cost, is easy to control, and ensures high glass quality. Attached Figure Description

[0020] Figure 1 This is a top view of the annealing kiln and slag box in Example 1.

[0021] Figure 2 This is a top view schematic diagram of the waste discharge device for float glass slag boxes in Example 1.

[0022] Figure 3 for Figure 2 A schematic diagram of the test structure.

[0023] The markings in the diagram are: 1-annealing kiln; 11-through groove; 12-chimney pipe; 121-airflow regulating valve; 122-diagonal brace; 123-adsorption layer; 2-slag box. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0025] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0027] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0028] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0029] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0030] Example 1 In some production processes, a slag box is connected to the rear end of the tin bath, and the slag box is adjacent to the inlet of the annealing furnace. A transition roller is installed inside the slag box, which primarily ensures a smooth transition of the glass ribbon from the tin bath to the annealing furnace. In the tin bath, molten glass combines with molten tin and protective gases (such as hydrogen and nitrogen) to form a complex multiphase system. Due to the differences between the phase components and the high temperature, oxidation-reduction reactions occur, leading to the formation of tin oxides and sulfides. If the waste gas generated in the tin bath cannot be effectively discharged, tin oxides and sulfur oxides will adhere to the surface of the transition roller in the slag box. When the glass ribbon passes through, this will cause surface defects such as scratches, clumps of adhesive, and imprints on the bottom surface of the glass ribbon, affecting the continuous production of high-quality glass.

[0031] Currently, the exhaust gas in the slag box is mainly discharged through the gap between the slag box and the annealing furnace. When the exhaust gas discharge efficiency is low, it is difficult to ensure the cleanliness of the transition roller surface inside the slag box. Some factories install pipes in the gap between the slag box and the annealing furnace, and then use the A-zone fan to centrally discharge the exhaust gas through the pipes. This method is not only energy-intensive and increases costs, but the sulfur dioxide emitted in the pipes also pollutes the atmosphere. As the fan is the source of suction power, the airflow in the slag box is affected as the fan frequency increases, causing defects such as flared edges and micro-deformation on the glass edges, affecting product quality.

[0032] like Figure 1-3 As shown, this embodiment provides a float glass slag box waste discharge device, including a through groove 11 installed on the top surface of the inlet end of an annealing furnace 1, wherein the annealing furnace 1 is connected adjacent to the slag box 2; the airflow of waste gas in the slag box 2 is 300-400m³. 3 / h.

[0033] The top surface of the inlet end of the annealing furnace 1 is provided with five through slots 11 spaced apart along the width direction; It also includes five chimney pipes 12, which are erected on the top of the annealing kiln 1, and one end of each chimney pipe 12 is welded to one of the through grooves 11.

[0034] The chimney pipe 12 has a height of 6m and an inner diameter of 200m. The chimney pipe 12 has a cylindrical structure. The cylindrical structure helps the flue gas flow smoothly inside, reduces resistance, and improves the flue gas exhaust efficiency; furthermore, the relatively smooth inner surface of the cylinder is not conducive to the deposition of soot, which is beneficial to the emission of flue gas and the cleanliness of the chimney.

[0035] Each of the chimney pipes 12 is equipped with an airflow regulating valve 121. The airflow regulating valve can precisely control the airflow of exhaust gas inside the chimney pipe.

[0036] The outer wall of the chimney pipe 12 is connected to a diagonal brace 122, and the end of the diagonal brace 122 away from the chimney pipe 12 is welded to the annealing furnace 1. The diagonal brace can better ensure the structural stability of the chimney pipe.

[0037] A sealing structure is provided at the connection between the chimney pipe 12 and the through groove 11. The sealing structure can effectively prevent exhaust gas leakage, ensure the cleanliness of the production environment and the health of workers, and also help improve production efficiency and product quality.

[0038] An adsorption layer 123 is provided inside the end of the chimney pipe 12 away from the annealing kiln 1. The adsorption layer can effectively adsorb harmful substances in the exhaust gas, such as sulfur dioxide, thereby reducing the amount of pollutants emitted into the environment. In some embodiments, the material of the adsorption layer can be activated carbon, molecular sieve, silica gel, glass fiber, ceramic fiber, etc.

[0039] When using this method, taking the production of 1.7-3.mm glass as an example, the initial data recording is as follows: carefully check the valve opening at each position of the waste discharge device on site and record it in detail (for example, the opening of all 5 positions from left to right is 50%). At the same time, measure the curvature of the original plate and record it.

[0040] Preliminary valve adjustment: Reduce the opening of the middle valve by 10%, reduce the opening of the secondary left and secondary right valves by 5%, and increase the opening of the left and right valves by 10% to change the airflow distribution.

[0041] Valve adjustment under temperature control: Closely observe the temperature of zone A of the annealing furnace. When the intermediate temperature point decreases by 1°C, reduce the valve opening by 1% - 2%; when the left, second left, second right, and right temperature points increase by 1°C, increase the valve opening by 2% - 3%.

[0042] Bending degree detection and recording: Measure and record the bending degree of the original board to provide data for subsequent adjustments.

[0043] Adjustments related to curvature, temperature, and valves: For every 0.1mm decrease in curvature, the setpoint for the middle temperature point in zone C decreases by 1℃, while simultaneously increasing the valve opening by 1% - 2%; the setpoints for the left, second-left, second-right, and right temperature points increase by 1℃, while decreasing the valve opening by 2% - 4%. Subsequently, repeat steps 3, 4, 5, and 6 to continuously optimize production parameters.

[0044] Termination of adjustment condition: When the original plate curvature measured by quality inspection is ≤0.2mm, the production parameters are considered to have reached the ideal state, and no further adjustments are made. Adjustable valves are installed on the stainless steel pipes to flexibly adjust the airflow at the left, second-left, middle, second-right, and right positions according to different production process requirements. This design effectively reduces glass stress, significantly improves cutting quality and curvature, reduces problems such as horizontal breakage, fogging, and uneven rounding, and reduces losses in the storage area.

[0045] The float glass slag box waste discharge device provided by this utility model has a through groove set on the top surface of the inlet end of the annealing furnace, and a chimney pipe is erected on the top of the annealing furnace. One end of the chimney pipe is welded to the through groove. The height of the chimney pipe is limited to 5m to 8m and the inner diameter is 200mm to 250mm. Through the clever selection of the chimney pipe position and the chimney pipe structure design, the waste gas in the slag box can be discharged efficiently, ensuring sufficient suction force, effectively reducing the generation of tin oxides and sulfides and other deposits on the roller surface, ensuring the cleanliness of the produced glass surface, and utilizing the chimney effect to discharge the waste gas naturally. It has low cost, is easy to control, and ensures high glass quality.

[0046] The chimney pipe 12 is placed at the top of the inlet of the annealing furnace 1, which allows for better natural exhaust and higher efficiency.

[0047] In some embodiments, the height of the chimney pipe 12 is 5m to 8m, and the inner diameter is 200mm to 250mm. Preferably, the height of the chimney pipe is 6m to 8m, and the inner diameter is 220mm to 250mm. Studies have found that setting the height and inner diameter within a specific ratio range can ensure high exhaust efficiency of the chimney pipe and ensure stable natural discharge of exhaust gas.

[0048] In some embodiments, 5 to 7 chimney pipes 12 are spaced apart along the width direction on the top surface of the inlet end of the annealing furnace 1. A narrow slag box discharge space allows a large amount of heat to enter the annealing furnace, making it difficult to reduce the heat of the thick plate core and the stress on the glass plate. This can easily lead to problems such as glass breakage, horizontal slag formation, fogging, uneven rounding, poor edge cleaning, spontaneous cracking in the storage area, and difficulty in cutting. In thin plate production, the edge heat is too low, resulting in "lotus leaf" edges. This can cause excessive curvature, incomplete edges and corners, and poor cutting quality. The production of both thin and thick plates is unstable, resulting in poor cutting performance and edge quality, failing to meet high customer standards and impacting market competitiveness. This application addresses this by arranging 5-7 chimney pipes spaced apart along the width direction of the top surface of the annealing furnace inlet end. By controlling the different exhaust volumes of the multiple chimney pipes, the quality of the glass can be guaranteed.

[0049] In some embodiments, the thickness of the adsorption layer 123 is 20cm to 30cm. A suitable thickness provides a larger adsorption area, ensuring that harmful gases are fully adsorbed, extending the service life of the adsorption material, reducing replacement frequency, and simultaneously ensuring appropriate resistance when gas passes through, thereby improving adsorption efficiency.

[0050] In some embodiments, the chimney pipe 12, at the end furthest from the annealing furnace 1, is provided with a drawer structure that can be pushed and pulled inwards and outwards. The bottom surface of the drawer structure is a mesh structure, and the drawer structure is used to hold adsorbent material. The drawer structure can be easily pushed and pulled, making the replacement and maintenance of the adsorbent material easier, eliminating the need for machine downtime for maintenance, and improving production efficiency.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste discharge device for float glass slag boxes, characterized in that, Includes a through groove set on the top surface of the inlet end of the annealing kiln, wherein the annealing kiln is connected to the slag box in close proximity; It also includes a chimney pipe, which is erected on the top of the annealing kiln, and one end of the chimney pipe is welded to the through groove. The height of the chimney pipe is 5m to 8m, and the inner diameter is 200mm to 250mm; Each chimney pipe is equipped with an airflow regulating valve, and a diagonal brace is connected to the outer wall of the chimney pipe. The end of the diagonal brace away from the chimney pipe is welded to the annealing kiln. A sealing structure is arranged at the connection between the chimney pipe and the through groove. An adsorption layer is provided inside the end of the chimney pipe away from the annealing kiln.

2. The float glass slag box waste discharge device according to claim 1, characterized in that, The chimney pipe has a cylindrical structure.

3. The float glass slag box waste discharge device according to claim 1, characterized in that, The chimney pipe has a height of 6m to 8m and an inner diameter of 220mm to 250mm.

4. The float glass slag box waste discharge device according to claim 1, characterized in that, The top surface of the inlet end of the annealing furnace is provided with 5 to 7 chimney pipes spaced apart along the width direction.

5. The float glass slag box waste discharge device according to claim 1, characterized in that, The thickness of the adsorption layer is 20cm to 30cm.

6. The float glass slag box waste discharge device according to claim 1, characterized in that, The chimney pipe is provided with a drawer structure that can be pushed and pulled inwards on the side away from the annealing furnace. The bottom surface of the drawer structure is a mesh structure, and the drawer structure is used to place adsorbent material.

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