An annealing lehr and a float glass production line

Abstract

The utility model belongs to float glass technical equipment field especially relates to a kind of annealing lehr and float glass production line.Annealing lehr includes: fast cooling kiln body, with fast cooling kiln cavity;Circulation kiln body, with circulation kiln cavity, circulation kiln body is communicated fast cooling kiln body;And pipeline structure, including first cooling pipe, hot air pipe and drive assembly, first cooling pipe is at least partially located in fast cooling kiln cavity and has first air inlet and first air outlet, one end of hot air pipe is communicated first air outlet, the other end of hot air pipe and circulation kiln cavity jointly form circulation loop, drive assembly is used to drive the gas flow in hot air pipe.The utility model can improve the heat utilization efficiency in float glass annealing process, and improve the annealing quality of glass ribbon.

Description

Technical Field

[0001] This utility model belongs to the field of float glass technology and equipment, and particularly relates to an annealing furnace and a float glass production line. Background Technology

[0002] Currently, the cooling air systems of zones C and D in the annealing furnace of a typical float glass production line are relatively independent and not interconnected. Room temperature air from the upper and lower cooling ducts of zone C is drawn in from the exhaust port at the rear of zone C. After passing through the high-temperature glass ribbon in zone C in a counter-current cooling process, the air is heated to a temperature of over 300°C and finally extracted from the front of zone C. The waste heat air is generally extracted by the zone C fan and then directly discharged into the atmosphere at a higher altitude.

[0003] The hot air in zone D of the annealing furnace comes from the circulating hot air drawn back from the front space of the inner cavity of zone D. When the annealing furnace is first put into production, or during normal production, especially when producing ultra-thin glass, the temperature in zone D is often too low, resulting in insufficient furnace temperature and failure of glass ribbon annealing. The only way to raise the temperature and maintain the pressure is to temporarily burn fire at the edge of zone D, but the heating is very difficult, costly and ineffective, resulting in unsatisfactory annealing of the glass ribbon. Utility Model Content

[0004] The purpose of this application is to provide an annealing furnace that addresses the issues of improving the annealing quality of glass ribbons and reducing costs.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: An annealing furnace is provided, comprising: The kiln body is designed for rapid cooling, and it has a rapid cooling kiln cavity. A circulating kiln body, having a circulating kiln cavity, the circulating kiln body being connected to the rapid cooling kiln body; and The pipeline structure includes a first cooling pipe, a hot air pipe, and a drive assembly. The first cooling pipe is at least partially located inside the rapid cooling kiln cavity and has a first air inlet and a first air outlet. One end of the hot air pipe is connected to the first air outlet, and the other end of the hot air pipe forms a circulation loop with the circulating kiln cavity. The drive assembly is used to drive the gas flow inside the hot air pipe.

[0006] In some embodiments, the circulating kiln body has a circulating air inlet and a circulating air outlet arranged at intervals from the circulating air inlet. The circulating air inlets are all connected to the hot air pipe and the circulating kiln cavity; the circulating air outlets are all connected to the hot air pipe and the circulating kiln cavity.

[0007] In some embodiments, the hot air duct includes a first duct segment and a second duct segment, one end of the first duct segment is connected to one end of the second duct segment, the other end of the first duct segment is connected to the first air outlet, the other end of the second duct segment is connected to the circulating air inlet, and the second duct segment is connected to the circulating air outlet.

[0008] In some embodiments, the drive assembly includes a first fan located on the first pipe segment and a second fan located on the second pipe segment.

[0009] In some embodiments, the piping structure further includes a first vent pipe located on the first pipe segment and a second vent pipe located on the second pipe segment.

[0010] In some embodiments, the piping structure further includes a control valve, and the first pipe section, the second pipe section, the first vent pipe, and the second vent pipe are all provided with the control valve.

[0011] In some embodiments, two circulating kiln chambers are arranged and are interconnected. The hot air pipe further includes a third pipe section and a fourth pipe section. The second pipe section and the third pipe section respectively form the circulating loop with the two circulating kiln chambers. The fourth pipe section is connected to the second pipe section and the third pipe section.

[0012] In some embodiments, the piping structure further includes a second cooling pipe located at least partially in the rapid cooling kiln cavity, the second cooling pipe having a second air inlet and a second air outlet, the second cooling pipe being connected to the hot air pipe through the second air outlet, and the drive assembly further including a third fan disposed on the third pipe section.

[0013] In some embodiments, the first cooling pipe is located above the second cooling pipe.

[0014] Secondly, a float glass production line is provided, which includes the annealing furnace and the float glass production line further includes a conveying assembly arranged sequentially in the rapid cooling furnace chamber and the circulating furnace chamber. The beneficial effects of this application are as follows: by setting a first cooling pipe in the rapid cooling furnace cavity, the air in the first cooling pipe cools the glass ribbon in the rapid cooling furnace cavity and absorbs heat. That is, the first cooling pipe absorbs the heat of the rapid cooling furnace cavity and transports it to the hot air pipe. The driving component drives the air in the hot air pipe to flow into the circulating furnace cavity and forms a circulation loop, realizing the circulation of hot air in the circulating furnace cavity. This enables the recovery and utilization of waste heat generated in the rapid cooling process, improves the heat utilization efficiency in the float glass annealing process, reduces the overall energy consumption, and ensures that the glass ribbon is uniformly cooled by circulating hot air in the circulating furnace cavity, thereby improving the annealing quality of the glass ribbon. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the annealing furnace provided in the embodiments of this application; Figure 2 yes Figure 1 A schematic diagram of the pipeline structure; Figure 3 This is a schematic diagram of the principle of the tin bath and edge-pulling machine provided in another embodiment of this application.

[0017] The following are the labeling elements in the figure: 100. Annealing kiln; 11. Rapid cooling kiln body; 111. Rapid cooling kiln cavity; 12. Circulating kiln body; 121. Circulating kiln cavity; 20. Piping structure; 21. First cooling pipe; 22. Second cooling pipe; 211. First air inlet; 212. First air outlet; 221. Second air inlet; 222. Second air outlet; 30. Drive assembly; 31. First fan; 32. Second fan; 33. Third fan; 50. 141. Control valve; 142. First vent pipe; 143. Second vent pipe; 244. Hot air pipe; 251. First pipe section; 262. Second pipe section; 273. Third pipe; 284. Fourth pipe section; 49. Conveying assembly; 40. Conveying roller; 41. Roller support; 42. Roller support; 101. Glass belt; 104. Circulation loop; 122. Circulation air inlet; 123. Circulation air outlet; 110. Edge pulling machine; 120. Tin bath. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of this application.

[0019] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are for descriptive convenience only, not indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0020] Please see Figures 1 to 3 This application provides an annealing furnace 100 and a float glass production line having the same. The annealing furnace 100 is used to anneal glass strips 101 to reduce the internal stress of the glass strips 101.

[0021] Annealing furnace 100 can perform controlled gradient cooling of the glass sheet (approximately 600°C) formed in float tin bath 120 to near room temperature (approximately 90°C), thereby controlling the thermal stress generated in the glass ribbon 101 within an acceptable range. Annealing furnace 100 includes annealing zones A, B, C, E0, D, and F.

[0022] Terminology Explanation: Annealing zone C refers to the rapid cooling zone of annealing furnace 100. Like annealing zones A and B, annealing zone C uses indirect cooling of the glass ribbon 101 through air ducts. That is, cold air flows and cools the upper and lower sealed cooling pipes in the cavity of annealing furnace 100, and then conducts and radiates through the cooling pipes to cool the upper and lower surfaces of the continuously flowing glass ribbon 101 in the cavity of annealing furnace 100 respectively.

[0023] Annealing zone D refers to the hot air circulation cooling zone, where circulating hot air is directly blown onto the upper and lower surfaces of the glass strip 101.

[0024] Please see Figures 1 to 3 The annealing furnace 100 includes: a pipe structure 20, a rapid cooling kiln body 11, and a circulating kiln body 12. Both the rapid cooling kiln body 11 and the circulating kiln body 12 are steel tunnel kilns, characterized by high temperature resistance and corrosion resistance. It can be understood that the rapid cooling kiln body 11 and the circulating kiln body 12 correspond to the aforementioned annealing zone C and annealing zone D, respectively.

[0025] The rapid cooling furnace body 11 has a rapid cooling furnace cavity 111; the rapid cooling furnace body 11 receives the formed glass ribbon 101 from the tin bath 120 of the previous process, and the glass ribbon 101 will be rapidly cooled when passing through the rapid cooling furnace cavity 111.

[0026] The circulating kiln body 12 has a circulating kiln cavity, and the circulating kiln body 12 is connected to the rapid cooling kiln body 11, so that the glass ribbon 101 that has been rapidly cooled can be cooled by circulating hot air in the circulating kiln cavity 121.

[0027] Please see Figures 1 to 3 The pipe structure 20 includes a first cooling pipe 21, a hot air pipe 23, and a drive assembly 30. The first cooling pipe 21 is at least partially located in the rapid cooling furnace chamber 111 and has a first air inlet 211 and a first air outlet 212. Low-temperature air can flow into the first cooling pipe 21 from the first air inlet 211 and absorb heat from the rapid cooling furnace chamber 111 as it flows through the first cooling pipe 21 to rapidly cool the glass ribbon 101 in the rapid cooling furnace chamber 111. The air then flows out from the first air outlet 212, and so on.

[0028] One end of the hot air pipe 23 is connected to the first air outlet 212, and the other end of the hot air pipe 23 forms a circulation loop 104 together with the circulating kiln cavity. The driving component 30 is used to drive the gas flow in the hot air pipe 23.

[0029] Please see Figures 1 to 3 Understandably, one end of the hot air duct 23 receives heated air (approximately 300 degrees Celsius) from the first air outlet 212, and then delivers the air into the circulating kiln chamber. The air blows onto the glass ribbon 101 located within the circulating kiln chamber, subjecting it to thermal cooling. The air then flows back into the hot air duct 23 from the circulating kiln chamber, mixes with the high-temperature air from the first air outlet 212, and is then reintroduced into the circulating kiln chamber, thus completing the cycle. The gas flow direction is as follows: Figure 1 and Figure 2 As shown by the arrow in the image.

[0030] Please see Figures 1 to 3Ultimately, the heat absorbed by the first cooling pipe 21 in the rapid cooling chamber 111 is continuously transported to the circulating chamber 121 through the hot air pipe 23. This not only avoids the waste of heat but also replenishes the heat in the circulating chamber, improving the cooling quality of the glass strip 101 in the circulating chamber. The annealing furnace 100 provided in this application embodiment cools the glass strip 101 in the rapid cooling furnace chamber 111 by setting a first cooling pipe 21 in the rapid cooling furnace chamber 111 and absorbing heat by the air in the first cooling pipe 21. That is, the first cooling pipe 21 absorbs the heat in the rapid cooling furnace chamber 111 and delivers it to the hot air pipe 23. The driving component 30 drives the air in the hot air pipe 23 to flow into the circulating furnace chamber and forms a circulation loop 104, realizing the circulation of hot air in the circulating furnace chamber. This allows the waste heat generated in the rapid cooling process to be recovered and utilized, improves the heat utilization efficiency in the float glass annealing process, reduces the overall energy consumption, and ensures that the glass strip 101 is uniformly cooled by circulating hot air in the circulating furnace chamber, thereby improving the annealing quality of the glass strip 101.

[0031] Please see Figures 1 to 3 In some embodiments, the circulating kiln body 12 is provided with a circulating air inlet 122 and a circulating air outlet 123 arranged at intervals from the circulating air inlet 122. The circulating air inlets 122 are all connected to the hot air pipe 23 and the circulating kiln cavity; the circulating air outlets 123 are all connected to the hot air pipe 23 and the circulating kiln cavity.

[0032] Optionally, by opening a circulating air inlet 122 and a circulating air outlet 123 in the circulating kiln body 12, the hot air pipe 23 and the circulating kiln cavity together form a circulating loop 104. The hot air from the circulating air inlet 122 is directly blown onto the upper and lower surfaces of the glass strip 101, and then flows out of the circulating kiln cavity from the circulating air outlet 123, and mixes with the hot air flowing from the first air outlet 212, and then flows back into the circulating kiln cavity from the circulating air inlet 122, thereby improving the uniformity and efficiency of the circulating flow.

[0033] Please see Figures 1 to 3 In some embodiments, the hot air duct 23 includes a first duct segment 231 and a second duct segment 232. One end of the first duct segment 231 is connected to one end of the second duct segment 232, the other end of the first duct segment 231 is connected to the first air outlet 212, the other end of the second duct segment 232 is connected to the circulating air inlet 122, and the second duct segment 232 is connected to the circulating air outlet 123.

[0034] Optionally, the drive component 30 drives the air flowing out from the first air outlet 212 to flow sequentially through the first pipe section 231 and the second pipe section 232, thereby realizing orderly hot air transmission from the first air outlet 212 to the circulating air inlet 122, further refining the layout of the pipes, improving heat exchange efficiency and flow stability, and avoiding pipe blockage or heat loss.

[0035] Please see Figures 1 to 3 In some embodiments, the drive assembly 30 includes a first fan 31 located on the first pipe segment 231 and a second fan 32 located on the second pipe segment 232.

[0036] Optionally, both the first fan 31 and the second fan 32 can be centrifugal fans. The first fan 31 and the second fan 32 can achieve independent driving of the first pipe section 231 and the second pipe section 232, which enhances the controllability and power support of hot air flow, improves the efficiency and response speed of the circulation loop 104, and avoids uneven flow caused by insufficient power of a single fan.

[0037] Please see Figures 1 to 3 In some embodiments, the pipeline structure 20 further includes a first vent pipe 141 located on the first pipe section 231 and a second vent pipe 142 located on the second pipe section 232.

[0038] Optionally, the first vent pipe 141 and the second vent pipe 142 can be used to release excess heat from the first pipe section 231 and the second pipe section 232 in a timely manner, prevent the hot air pipe 23 from being over-pressurized or overheated, improve the safety and stability of the system, and avoid heat waste or equipment damage.

[0039] Please see Figures 1 to 3 In some embodiments, the pipeline structure 20 further includes a control valve 50, and the first pipe section 231, the second pipe section 232, the first vent pipe 141 and the second vent pipe 142 are all equipped with the control valve 50.

[0040] Optionally, the control valve 50 located on the first pipe section 231 is a butterfly valve. The butterfly valve can be a manual butterfly valve or an electric butterfly valve. There is no restriction here, and it can be selected according to the actual situation.

[0041] The control valve 50 located on the second pipe section 232 is a manual multi-leaf valve. The control valves 50 located on the first vent pipe 141 and the second vent pipe 142 are both manual butterfly valves. Please see Figures 1 to 3 By setting control valves 50 in each section of the pipeline structure 20, the hot air flow can be precisely controlled and the venting path can be selected, thereby improving the system's automation level and response accuracy, enhancing the targeting and efficiency of heat recovery, avoiding increased energy consumption caused by ineffective circulation, reducing glass quality fluctuations, and lowering operating costs.

[0042] Please see Figures 1 to 3In some embodiments, two circulating kiln chambers are arranged and the two circulating kiln chambers are interconnected. The hot air pipe 23 further includes a third pipe section and a fourth pipe section 234. The second pipe section 232 and the third pipe section respectively form the circulating loop 104 with the two circulating kiln chambers. The fourth pipe section 234 connects the second pipe section 232 and the third pipe section. The drive assembly 30 further includes a third fan 33 disposed on the third pipe section.

[0043] Optionally, by setting up two interconnected circulating kiln chambers, the hot air circulating annealing path of the glass strip 101 is extended, so that the glass strip 101 passes through the two circulating kiln chambers in sequence for full annealing, thereby improving the quality of the glass strip 101.

[0044] Optionally, the third fan 33 can also be a centrifugal fan. The high-temperature air flowing from the second pipe section 232 is transported to the third pipe section through the fourth pipe section 234. The third pipe section then transports the air to the circulating air inlet 122 of the corresponding circulating kiln chamber and blows it toward the glass belt 101. The air then flows out from the corresponding circulating air outlet 123 back to the third pipe section and mixes with the high-temperature air flowing from the fourth pipe section 234 before flowing back into the circulating kiln chamber, thus circulating in sequence.

[0045] Please see Figures 1 to 3 In some embodiments, the pipe structure 20 further includes a second cooling pipe 22 located at least partially in the rapid cooling kiln cavity 111. The second cooling pipe 22 has a second air inlet 221 and a second air outlet 222. The second cooling pipe 22 is connected to the hot air pipe 23 through the second air outlet 222.

[0046] Optionally, by adding a second cooling pipe 22 inside the rapid cooling kiln cavity 111, the cooling efficiency of the rapid cooling kiln cavity 111 can be improved, the area and efficiency of heat recovery can be further increased, and the overall heat exchange performance can be improved.

[0047] Please see Figures 1 to 3 In some embodiments, the first cooling pipe 21 is located above the second cooling pipe 22, and the glass strip 101 is located between the first cooling pipe 21 and the second cooling pipe 22. The first cooling pipe 21 is used to absorb heat from the upper surface of the glass strip 101, and the second cooling pipe 22 is used to absorb heat from the lower surface of the glass strip 101.

[0048] Please see Figures 1 to 3 Optionally, by placing the first cooling pipe 21 above the second cooling pipe 22, layered heat absorption and convection are achieved, thereby improving and enhancing the temperature gradient control within the rapid cooling furnace cavity 111, increasing the efficiency of heat exchange, preventing heat loss from the lower layer, improving the cooling efficiency and quality of the glass ribbon 101, and enhancing the energy recovery rate.

[0049] Optionally, the gas flow direction within the first cooling pipe 21 and the second cooling pipe 22 is opposite to the movement direction of the glass ribbon 101. The gas flow direction is as follows: Figure 1 As indicated by the arrow.

[0050] Please see Figures 1 to 3 This utility model also proposes a float glass production line, which includes an annealing furnace 100. The specific structure of the annealing furnace 100 is as described in the above embodiments. Since this float glass production line adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0051] Please see Figures 1 to 3 In some embodiments, the float glass production line further includes a conveying assembly 40, which is arranged sequentially in the rapid cooling chamber 111 and the circulating chamber.

[0052] Optionally, the conveying assembly 40 includes a plurality of conveying rollers 41 arranged in sequence and a plurality of roller support brackets 42 for supporting the conveying rollers 41.

[0053] The float glass production line also includes a tin bath 120 and multiple edge-pulling machines 110 connected to the tin bath 120. The tin bath 120 is used to prepare molten glass into glass strips 101 and transport them to the annealing furnace 100.

[0054] It is understandable that by transporting the waste heat gas in the fast-cooling kiln 11 to and uniformly heating the circulating kiln 12, which has a low temperature, low pressure, or even negative pressure, the temperature inside the circulating kiln cavity can be raised smoothly. During normal production, especially when producing ultra-thin glass ribbons 101, the temperature and pressure inside the circulating kiln cavity can be uniformly increased, thereby improving the annealing quality of the glass ribbons 101.

[0055] The above are merely optional embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An annealing kiln, characterized in that, include: The kiln body is designed for rapid cooling, and it has a rapid cooling kiln cavity. A circulating kiln body having a circulating kiln cavity, the circulating kiln body being connected to the rapid cooling kiln body; as well as The pipeline structure includes a first cooling pipe, a hot air pipe, and a drive assembly. The first cooling pipe is at least partially located inside the rapid cooling kiln cavity and has a first air inlet and a first air outlet. One end of the hot air pipe is connected to the first air outlet, and the other end of the hot air pipe forms a circulation loop with the circulating kiln cavity. The drive assembly is used to drive the gas flow inside the hot air pipe.

2. The annealing furnace as described in claim 1, characterized in that: The circulating kiln body has a circulating air inlet and a circulating air outlet arranged at intervals from the circulating air inlet. The circulating air inlets are all connected to the hot air pipe and the circulating kiln cavity; the circulating air outlets are all connected to the hot air pipe and the circulating kiln cavity.

3. The annealing furnace as described in claim 2, characterized in that: The hot air duct includes a first duct section and a second duct section. One end of the first duct section is connected to one end of the second duct section, the other end of the first duct section is connected to the first air outlet, the other end of the second duct section is connected to the circulating air inlet, and the second duct section is connected to the circulating air outlet.

4. The annealing furnace as described in claim 3, characterized in that: The drive assembly includes a first fan located on the first pipe section and a second fan located on the second pipe section.

5. The annealing furnace as described in claim 3, characterized in that: The pipeline structure also includes a first vent pipe located on the first pipe section and a second vent pipe located on the second pipe section.

6. The annealing furnace as described in claim 5, characterized in that: The pipeline structure also includes control valves, and the first pipe section, the second pipe section, the first vent pipe and the second vent pipe are all equipped with the control valves.

7. The annealing furnace as described in any one of claims 3-6, characterized in that: Two circulating kiln chambers are arranged and are interconnected. The hot air pipe also includes a third pipe section and a fourth pipe section. The second pipe section and the third pipe section form the circulating loop with the two circulating kiln chambers respectively. The fourth pipe section is connected to the second pipe section and the third pipe section.

8. The annealing furnace as described in claim 7, characterized in that: The pipeline structure also includes a second cooling pipe located at least partially in the rapid cooling kiln cavity. The second cooling pipe has a second air inlet and a second air outlet. The second cooling pipe is connected to the hot air pipe through the second air outlet. The drive assembly also includes a third fan disposed on the third pipe section.

9. The annealing furnace as described in claim 8, characterized in that: The first cooling pipe is located above the second cooling pipe.

10. A float glass production line, characterized in that, The float glass production line includes an annealing furnace as described in any one of claims 1-9, and further includes a conveying assembly arranged sequentially in the rapid cooling furnace chamber and the circulating furnace chamber.

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