Float glass melting furnace and float glass production line

Abstract

The present invention provides a float glass melting furnace, comprising a melting part, a main cooling part, a first branch cooling part and a second branch cooling part. The main cooling part is connected to the melting part through a neck, and the two sides of the main cooling part are respectively connected with a first transverse passage and a second transverse passage. The first branch cooling part and the second branch cooling part are respectively arranged on both sides of the main cooling part, the first branch cooling part is connected to the first transverse passage, and the second branch cooling part is connected to the second transverse passage. The present invention also provides a float glass production line including the float glass melting furnace. The float glass melting furnace reduces the pulling amount of the glass liquid in the main cooling part by reasonably allocating the pulling amount of the main cooling part and the branch cooling part, thereby achieving the purpose of the main cooling part being able to produce thin glass, and at the same time effectively increases the convection amount of the glass liquid in the branch cooling part, thereby meeting the molding temperature of the glass liquid in the branch cooling part.

Description

[0001] This application claims priority to the Chinese patent application filed on November 27, 2020, with application number 202011368190.4 and invention name “Float glass melting furnace and float glass production line”. Technical Field

[0002] The invention relates to the technical field of float glass production, and in particular to a float glass melting furnace and a float glass production line. Background Art

[0003] In the prior art, float glass production lines generally adopt a "one kiln and one line" structure, that is, one kiln is matched with one glass production line (one melting furnace connected to one tin bath), such as Figure 1 As shown, the furnace only includes a melting part 100' and a cooling part 300', and also includes a neck 200', a small furnace 110' and a regenerator 120', etc. This melting furnace has certain limitations in actual production, especially a large-tonnage melting furnace cannot produce thin glass, which has an adverse impact on the business varieties and operating benefits of the enterprise. Summary of the invention

[0004] The main purpose of the present invention is to provide a float glass melting furnace, aiming to solve the technical problem that a large-tonnage float glass melting furnace cannot produce thin glass.

[0005] To achieve the above object, the present invention provides a float glass melting furnace, the float glass melting furnace comprising:

[0006] Melting section;

[0007] A main line cooling section, wherein the main line cooling section is connected to the melting section through a neck, and the two sides of the main line cooling section are respectively connected to a first transverse passage and a second transverse passage; and,

[0008] The first branch cooling part and the second branch cooling part are respectively arranged on both sides of the main cooling part. The first branch cooling part is connected to the first transverse passage, and the second branch cooling part is connected to the second transverse passage.

[0009] Optionally, both the first transverse passage and the second transverse passage are connected to the front half of the main line cooling section.

[0010] Optionally, an area of ​​the first branch cooling portion and an area of ​​the second branch cooling portion are both smaller than an area of ​​the main line cooling portion.

[0011] Optionally, a connection port of the neck connecting to the main line cooling portion is flared toward the main line cooling portion.

[0012] Optionally, the central axis of the melting section coincides with the central axis of the main line cooling section.

[0013] Optionally, a central axis of the first transverse passage and a central axis of the second transverse passage are both perpendicular to a central axis of the main line cooling portion.

[0014] Optionally, a central axis of the first transverse passage and a central axis of the main line cooling portion are arranged at an acute angle; and / or a central axis of the second transverse passage and a central axis of the main line cooling portion are arranged at an acute angle.

[0015] Optionally, the first transverse passage and the second transverse passage are symmetrically arranged about the central axis of the main line cooling portion.

[0016] Optionally, a central axis of the first transverse passage coincides with a central axis of the second transverse passage.

[0017] Optionally, the first branch cooling portion and the second branch cooling portion are symmetrically arranged about the central axis of the main line cooling portion.

[0018] Optionally, the central axis of the first branch cooling part is perpendicular to the central axis of the first transverse passage; the central axis of the second branch cooling part is perpendicular to the central axis of the second transverse passage.

[0019] Optionally, a distance range between a central axis of the first branch cooling part and a distance range between a central axis of the main cooling part and a distance range between a central axis of the second branch cooling part and a central axis of the main cooling part are both 15 to 30 m.

[0020] Optionally, a distance range between a central axis of the first branch cooling part and a distance range between a central axis of the main cooling part and a distance range between a central axis of the second branch cooling part and a central axis of the main cooling part are both 15 to 22 m.

[0021] The present invention also provides a float glass production line, comprising:

[0022] The aforementioned float glass melting furnace; and,

[0023] A tin bath is connected to the float glass melting furnace.

[0024] The present invention provides a float glass melting furnace. By adding two side transverse passages and two side branch cooling parts on both sides of a main cooling part, a new one-furnace three-line float glass melting furnace is formed. The float glass melting furnace reasonably distributes the drawing amount of the main cooling part and the branch cooling part, reduces the drawing amount of the glass liquid in the main cooling part, thereby achieving the purpose of the main cooling part being able to produce thin glass, and at the same time effectively increases the convection amount of the glass liquid in the branch cooling part, thereby meeting the molding temperature of the glass liquid in the branch cooling part. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of a float glass melting furnace with a "one furnace, one line" structure in the prior art;

[0027] Figure 2 It is a structural schematic diagram of a float glass melting furnace in one embodiment of the present invention;

[0028] Figure 3 for Figure 2 Schematic diagram of the partial structure of the float glass melting furnace shown.

[0029] Description of Figure Numbers:

[0030] Label name Label name 100′ Melting Section 110′ Small furnace 120′ Thermal storage room 200′ Neck 300′ Cooling unit 100 Melting Section 200 Neck 300 Main line cooling unit 400 First lateral passage 500 Second lateral passage 600 First branch cooling section 700 Second branch cooling section

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions, taking "A and / or B as an example", including solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] An embodiment of the present invention provides a float glass melting furnace.

[0036] In one embodiment of the present invention, Figure 2 and Figure 3 As shown, the float glass melting furnace comprises:

[0037] Melting section 100;

[0038] A main line cooling part 300, wherein the main line cooling part 300 is connected to the melting part 100 through a clamping neck 200, and the two sides of the main line cooling part 300 are respectively connected to a first transverse passage 400 and a second transverse passage 500; and,

[0039] The first branch cooling part 600 and the second branch cooling part 700 are respectively arranged on both sides of the main cooling part 300 . The first branch cooling part 600 is connected to the first transverse passage 400 , and the second branch cooling part 700 is connected to the second transverse passage 500 .

[0040] It should be noted that float glass is named because the glass liquid floats on the surface of the molten metal to obtain polishing and forming. The molten glass liquid flows continuously from the melting furnace into the tin bath filled with protective gas (N2 and H2) and floats on the surface of the metal tin liquid. After flattening and polishing, it forms a glass strip with uniform thickness, parallel surfaces, flatness and polishing. It is a kind of flat glass (plate-shaped silicate). Among them, the melting process of float glass is one of the main stages in the manufacturing process of float glass, that is, the process of heating qualified batch materials at high temperature to form uniform, pure, transparent and molding-compliant glass liquid. The melting furnace is the place where the float glass melting process occurs. Specifically, the glass melting process can be summarized into the following stages: silicate formation stage-glass liquid formation stage-glass liquid clarification stage-glass liquid homogenization stage-glass liquid cooling stage.

[0041] The existing "one furnace, one line" float glass melting furnace has certain limitations in actual production, especially large-tonnage melting furnaces cannot produce thin glass, that is, when the daily pulling capacity of the melting furnace is large, its cooling part cannot produce thin glass. Among them, the technical formula for the daily pulling capacity of the melting furnace is:

[0042] Daily pulling volume = pulling speed × average plate width × average thickness × 24 × 2.5

[0043] Where, daily pulling amount is the weight of the glass liquid pulled every day and night, in t;

[0044] Pulling speed - the length of the original glass plate pulled per unit time, in m / h;

[0045] Average plate width - the average width of the original glass plate in production, in meters;

[0046] Average thickness - the average thickness of the original glass sheet during production, in m;

[0047] 24 — number of hours per day and night, in h;

[0048] 2.5—Density of glass liquid, in t / m 3 .

[0049] From the above formula, we can know that when the daily pulling capacity of the "one furnace, one line" float glass melting furnace is large, and the area of ​​its cooling part is fixed, the average thickness of the original glass plate will increase. Therefore, such a large-tonnage melting furnace cannot produce thin glass, which will have an adverse impact on the company's business varieties and operating benefits.

[0050] The technical solution of this embodiment forms a new one-kiln three-line float glass melting furnace by adding two side transverse passages and two side branch cooling parts on both sides of the main cooling part 300 on the basis of the traditional large-tonnage "one kiln and one line" float glass melting furnace. By reasonably allocating the pulling amount of the main cooling part 300 and the branch cooling part, the pulling amount of the glass liquid of the main cooling part 300 is reduced, so that the main line can produce thin glass. At the same time, by increasing the convection amount of the glass liquid in the branch cooling part, the forming temperature of the glass liquid in the branch cooling part can also be met.

[0051] It can be understood that the main line is designed as a thin glass production line. Due to the small pulling amount, the glass liquid stays in the main line cooling section 300 for a long time, so that a good glass liquid clarification and homogenization effect can be achieved, and the molding quality of the thin glass in the main line cooling section 300 is improved. In addition, the initial molding temperature of the glass liquid is generally around 1050°C. Since a transverse passage is added between the branch cooling section and the main cooling section 300, when the glass liquid in the branch cooling section passes through the transverse passage, the heat dissipation of the glass liquid due to natural cooling will increase, and the molding temperature of the glass liquid at the outlet of the branch cooling section will be low. Therefore, it is necessary to increase the convection of the glass liquid in the branch cooling section, thereby increasing the heat conduction of the glass liquid in the branch cooling section, and finally reach the molding temperature that meets the glass liquid in the branch cooling section.

[0052] In the technical solution of this embodiment, the main line cooling section is used to produce thin glass, while the branch cooling sections on both sides are used to produce glass of conventional thickness. It should be noted that whether the main line or the branch line can produce thin glass is mainly determined by the drawing amount of the main line and the branch line, and the molding process temperature of the glass liquid of the main line cooling section 300 and the branch cooling section. The main line is designed as a thin glass production line because the drawing amount of the main line cooling section 300 is small, which reduces the convection amount of the glass liquid of the main line cooling section 300, which is beneficial to the clarification, homogenization and cooling effect of the glass liquid of the main line cooling section 300, and also increases the convection amount of the glass liquid of the branch cooling section, thereby increasing the molding temperature of the glass liquid of the branch cooling section, thereby simultaneously meeting the process requirements of the main line cooling section 300 for producing thin glass and the branch cooling section for producing conventional glass. Of course, in other embodiments, the branch cooling sections on both sides can also be used to produce thin glass.

[0053] In one embodiment, if Figure 2 and Figure 3 As shown, the first transverse passage 400 and the second transverse passage 500 are both connected to the front half of the main cooling section 300. The technical solution of this embodiment connects the transverse passages on both sides to the front end of the main cooling section 300, so that the glass liquid can be diverted to the transverse passages on both sides as soon as it flows into the main cooling section 300, thereby avoiding excessive temperature drop of the glass liquid before it flows into the branch cooling section, so as to meet the molding temperature of the glass liquid in the branch cooling section.

[0054] In another embodiment, the transverse passages on both sides may be connected to the middle section or the rear section of the main line cooling part 300 . The present invention does not limit the relative positions of the transverse passages on both sides and the main line cooling part 300 .

[0055] In one embodiment, if Figure 2 and Figure 3As shown, the area of ​​the first branch cooling section 600 and the area of ​​the second branch cooling section 700 are both smaller than the area of ​​the main cooling section 300. It can be understood that in this embodiment, the main cooling section is used to produce thin glass, while the branch cooling sections on both sides are used to produce conventional glass. By increasing the area of ​​the main cooling section 300 (i.e., increasing the average width of the original glass plate), under the condition that the daily pulling amount of the melting furnace is constant, it is beneficial to reduce the average thickness of the original glass plate, thereby facilitating the main cooling section 300 to produce thin glass.

[0056] In this embodiment, the area of ​​the first branch cooling section 600 is the same as the area of ​​the second branch cooling section 700, so that the pulling amounts of the branch cooling sections on both sides of the main cooling section 300 are the same, which is beneficial for the glass liquid in the main cooling section 300 to flow out evenly from both sides, thereby helping to improve the clarification, homogenization and cooling effects of the glass liquid in the main cooling section 300.

[0057] In another embodiment, the area of ​​the first branch cooling portion 600 is different from the area of ​​the second branch cooling portion 700 , but the areas of both branch cooling portions 600 are smaller than the area of ​​the main cooling portion 300 .

[0058] In another embodiment, the main cooling section 300, the first branch cooling section 600 and the second branch cooling section 700 may have the same area, that is, the two branch cooling sections have the same pulling amount as the main cooling section and can both be used to produce thin glass.

[0059] In this embodiment, Figure 2 and Figure 3 As shown, the connection port between the neck 200 and the main cooling part 300 is expanded toward the main cooling part 300. Specifically, a guide angle is provided at the end of the neck 200, and the guide angle adopts a chamfered structure, which is conducive to guiding the glass liquid from the neck 200 to flow into the main cooling part 300, reducing the retention of the glass liquid at the neck 200.

[0060] In one embodiment, if Figure 2 and Figure 3 As shown, the central axis of the melting section 100 coincides with the central axis of the main line cooling section 300. This is beneficial for the glass liquid in the melting section 100 to flow smoothly into the main line cooling section 300, and is beneficial for the reasonable layout of the melting, forming, annealing and cold end processes of the one-kiln three-line float glass production line.

[0061] In another embodiment, the central axis of the melting part 100 and the central axis of the main cooling part 300 can be offset, that is, the central axes of the two do not overlap. It can be understood that as long as the distance between the central axes of the two is not large, it will not affect the flow of the glass liquid in the melting part 100 into the main cooling part 30.

[0062] In one embodiment, the central axis of the first transverse passage 400 and the central axis of the second transverse passage 500 are both perpendicular to the central axis of the main cooling section 300. That is, the transverse passages on both sides of the main cooling section 300 are perpendicular to the main cooling section 300, which is not only conducive to the smooth diversion of the glass liquid from the main cooling section 300 to the transverse passages on both sides, but also conducive to shortening the length of the transverse passages, avoiding excessive cooling of the glass liquid when passing through the transverse passages, thereby reducing the molding quality of the glass liquid in the branch cooling section.

[0063] In another embodiment, the transverse passages on both sides of the main line cooling part 300 may not be perpendicular to the main line cooling part 300, or the transverse passage on one side may be perpendicular to the main line cooling part 300, and the transverse passage on the other side may not be perpendicular to the main line cooling part, and the present invention does not limit this.

[0064] Furthermore, the central axis of the first transverse passage 400 is set at an acute angle with the central axis of the main cooling section 300; and / or, the central axis of the second transverse passage 500 is set at an acute angle with the central axis of the main cooling section 300. It can be understood that the transverse passage can be set at an acute angle with the main cooling section 300, and the transverse passage is inclined toward the rear end of the main cooling section 300, so that the glass liquid in the main cooling section 300 can quickly flow to the transverse passage and the branch cooling section, which is conducive to improving the molding temperature of the glass liquid in the branch cooling section.

[0065] In one embodiment, if Figure 2 and Figure 3 As shown, the first transverse passage 400 and the second transverse passage 500 are symmetrically arranged about the central axis of the main cooling part 300. In this way, it is beneficial to the reasonable convection of the glass liquid in the two transverse passages, and it is beneficial to increase the heat conduction of the glass liquid in the branch cooling part, so as to facilitate the molding of the glass liquid in the branch cooling part. Furthermore, the central axis of the first transverse passage 400 coincides with the central axis of the second transverse passage 500, which is beneficial for the glass liquid in the main cooling part 300 to flow out from both sides at the same time, so as to quickly improve the clarification, homogenization and cooling effect of the glass liquid in the main cooling part 300. Of course, in other embodiments, the central axis of the first transverse passage 400 and the central axis of the second transverse passage 500 may not coincide, but the two transverse passages may also be symmetrically arranged about the central axis of the main cooling part 300.

[0066] In another embodiment, the first transverse passage 400 is asymmetrically arranged with the second transverse passage 500. It can be understood that, although the transverse passages on both sides of the main cooling section are asymmetrically arranged, the glass liquid in the main cooling section 300 can still be diverted to the transverse passages on both sides, which has the effect of reducing the pulling amount of the main cooling section 300.

[0067] In one embodiment, the first branch cooling section 600 and the second branch cooling section 700 are symmetrically arranged about the central axis of the main cooling section 300. The technical solution of this embodiment is conducive to the reasonable layout of the melting, forming, annealing and cold end processes of the one-kiln three-line float glass production line by symmetrically arranging the branch cooling sections on both sides of the main cooling section 300, and is conducive to the glass liquid in the main cooling section 300 to flow out evenly from both sides, thereby further improving the clarification, homogenization and cooling effects of the glass liquid in the main cooling section 300.

[0068] Furthermore, the central axis of the first branch cooling section 600 is perpendicular to the central axis of the first transverse passage 400; the central axis of the second branch cooling section 700 is perpendicular to the central axis of the second transverse passage 500. That is, the first branch cooling section 600, the main cooling section 300 and the second branch cooling section 700 are parallel to each other. Of course, in other embodiments, the central axis of the first branch cooling section 600 is not perpendicular to the central axis of the first transverse passage 400, and the central axis of the second branch cooling section 700 is not perpendicular to the central axis of the second transverse passage 500, but the two branch cooling sections can still be symmetrically arranged about the central axis of the main cooling section 300.

[0069] In another embodiment, the first branch cooling section 600 and the second branch cooling section 700 are asymmetrically arranged. It can be understood that although the branch cooling sections on both sides of the main cooling section are asymmetrically arranged, the glass liquid in the main cooling section 300 can still be diverted to the branch cooling sections on both sides, which has the effect of reducing the pulling amount of the main cooling section 300.

[0070] Furthermore, if Figure 3 As shown, the spacing L1 between the central axis of the first branch cooling part 600 and the central axis of the main cooling part 300, and the spacing L2 between the central axis of the second branch cooling part 700 and the central axis of the main cooling part 300 are both in the range of 15 to 30 m. That is, the length range of the lateral passages on both sides is 15 to 30 m. Optionally, the lengths of the lateral passages on both sides can be 15 m, 22 m, 25 m, and 30 m, respectively. The length range of the lateral passages on both sides is determined by factors such as the pulling amount of the melting furnace design, the process layout of the molding equipment, and the specifications of the glass products produced. It can be understood that if the length of the lateral passages on both sides is too short, it cannot meet the reasonable process layout requirements of the branch line; and if the length of the lateral passages on both sides is too long, it will cause the glass liquid to cool too much when passing through the lateral passages, so that the temperature of the glass liquid in the two branch cooling parts will also be low, which will cause the glass liquid temperature of the flow channel section to differ greatly from left to right and from top to bottom, so that the glass quality cannot meet the requirements of engineering-grade glass quality.

[0071] Preferably, the length of the transverse passages on both sides ranges from 15 to 22 m. It can be understood that the shorter the length of the transverse passages on both sides, the easier it is to meet the forming temperature of the glass liquid in the branch cooling part. However, if the length of the transverse passages is too short, it is not conducive to the placement and layout of the branch cooling part. Therefore, the technical solution of this embodiment further limits the length range of the transverse passages on both sides to ensure the forming temperature of the glass in the branch cooling part while reasonably arranging the branch cooling part.

[0072] The embodiment of the present invention further proposes a float glass production line, which includes the aforementioned float glass melting furnace and a tin bath, and the tin bath is connected to the float glass melting furnace. In this embodiment, the float glass melting furnace includes three cooling parts, namely a main line cooling part 300 and two branch cooling parts; and the number of tin baths is also correspondingly set to three, and the three tin baths are connected to the three cooling parts one by one. The specific structure of the float glass melting furnace refers to the above embodiment. Since the float glass production line adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0073] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A float glass melting furnace, characterized in that: include: Melting section; A main line cooling section, wherein the main line cooling section is connected to the melting section through a neck, and the two sides of the main line cooling section are respectively connected to a first transverse passage and a second transverse passage; and, A first branch cooling part and a second branch cooling part are respectively arranged on both sides of the main cooling part, the first branch cooling part is connected to the first transverse passage, and the second branch cooling part is connected to the second transverse passage; The first branch cooling part and the second branch cooling part are symmetrically arranged with respect to the central axis of the main cooling part; the central axis of the first branch cooling part and the central axis of the first transverse passage are perpendicular to each other; the central axis of the second branch cooling part and the central axis of the second transverse passage are perpendicular to each other; The distance between the central axis of the first branch cooling part and the central axis of the main cooling part, and the distance between the central axis of the second branch cooling part and the central axis of the main cooling part are both 15 to 30 m.

2. The float glass melting furnace according to claim 1, characterized in that: The first transverse passage and the second transverse passage are both connected to the front half of the main line cooling section.

3. The float glass melting furnace according to claim 1, characterized in that: An area of ​​the first branch cooling portion and an area of ​​the second branch cooling portion are both smaller than an area of ​​the main line cooling portion.

4. The float glass melting furnace according to claim 1, characterized in that: A connection port of the clamp neck connected to the main line cooling portion is expanded toward the main line cooling portion.

5. The float glass melting furnace according to any one of claims 1 to 4, characterized in that: The central axis of the melting portion coincides with the central axis of the main line cooling portion.

6. The float glass melting furnace according to claim 5, characterized in that: A central axis of the first transverse passage and a central axis of the second transverse passage are both perpendicular to a central axis of the main line cooling portion.

7. The float glass melting furnace according to claim 5, characterized in that: The central axis of the first transverse passage is arranged at an acute angle with the central axis of the main line cooling portion; and / or the central axis of the second transverse passage is arranged at an acute angle with the central axis of the main line cooling portion.

8. The float glass melting furnace according to any one of claims 1 to 3, characterized in that: The first transverse passage and the second transverse passage are symmetrically arranged about a central axis of the main line cooling portion.

9. The float glass melting furnace according to claim 8, characterized in that: A central axis of the first transverse passage coincides with a central axis of the second transverse passage.

10. The float glass melting furnace according to claim 1, characterized in that: The distance between the central axis of the first branch cooling part and the central axis of the main cooling part, and the distance between the central axis of the second branch cooling part and the central axis of the main cooling part are both 15 to 22 m.

11. A float glass production line, characterized in that: include: A float glass melting furnace as claimed in any one of claims 1 to 10; as well as, A tin bath is connected to the float glass melting furnace.

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