Glass melting furnace arch

Abstract

This utility model relates to the field of refractory materials for glass industrial furnaces, and discloses a large archway for a glass melting furnace. It includes a left archway brick group, a right archway brick group, and an interlocking archway brick group located between the left and right archway brick groups. The key feature is that both the left and right archway brick groups are composed of multiple composite archway bricks arranged sequentially. Each composite archway brick includes an outer load-bearing brick and an inner anti-corrosion brick located below the outer load-bearing brick. The outer load-bearing brick and the inner anti-corrosion brick are detachably connected, and an expansion gap exists between them. This glass melting furnace archway uses composite archway bricks with an outer and inner layer brick in both archway brick groups, and the inner layer brick of the composite archway brick has anti-corrosion properties. Simultaneously, the expansion gap between the outer and inner layer bricks gives the glass melting furnace archway thermal expansion decoupling capabilities, significantly reducing stress cracks caused by thermal expansion.

Description

Technical Field

[0001] This utility model relates to the field of refractory materials for glass industrial furnaces, specifically to a large arch for a glass melting furnace. Background Technology

[0002] Currently, the main arches of glass melting furnaces in existing technologies generally use wedge-shaped silica bricks made of a single material. This type of glass melting furnace arch has the following drawbacks:

[0003] 1. Insufficient resistance to erosion: When silica bricks (SiO2≥96%) are in long-term contact with high-alkali glass melt at temperatures above 1450℃, a low-viscosity silicate layer will form on the surface, resulting in an average monthly erosion rate of 0.25-0.35mm.

[0004] 2. Thermal stress concentration: The thermal expansion coefficient of silica bricks is 4.2 × 10⁻⁶. -6 The difference between the temperature and the arch steel structure caused stress cracks, and the subsidence of the arch top was generally >50mm after the kiln age exceeded 5 years.

[0005] 3. High maintenance costs: Traditional integral structures begin to show rat holes after 2 years, which need to be repaired with special silica heat repair material. Moreover, as the kiln age increases, there are more and more rat holes. Not only does it require repairing the rat holes by damaging the outer insulation layer, but it also requires ceramic welding repair inside, and the maintenance cost increases year by year.

[0006] Therefore, there is an urgent need to provide a new arch structure to solve the problems of insufficient erosion resistance, thermal stress concentration, and high maintenance costs of existing glass melting furnace arches. Utility Model Content

[0007] The purpose of this invention is to overcome the problems of insufficient erosion resistance, thermal stress concentration cracks, and high maintenance costs in existing glass melting furnace arches due to the use of single-material silica bricks. This invention provides a glass melting furnace arch that employs composite arch bricks with outer and inner layers in the arch brick assemblies on both sides. The inner layer of the composite arch bricks has erosion resistance, thus giving the glass melting furnace arch erosion resistance. Simultaneously, an expansion gap exists between the outer and inner layers, enabling the glass melting furnace arch to decouple thermal expansion, significantly reducing stress cracks caused by thermal expansion, increasing the lifespan of the glass melting furnace arch, and lowering maintenance costs.

[0008] To achieve the above objectives, this utility model provides a large archway for a glass melting furnace, comprising a left archway brick group, a right archway brick group, and a locking archway brick group located between the left and right archway brick groups. Both the left and right archway brick groups are composed of multiple composite archway bricks arranged sequentially. Each composite archway brick includes an outer load-bearing brick and an inner anti-erosion brick located below the outer load-bearing brick. The outer load-bearing brick and the inner anti-erosion brick are detachably connected, and an expansion gap exists between them.

[0009] Preferably, the outer load-bearing brick and the inner erosion-resistant brick are detachably connected by a mortise and tenon structure.

[0010] Preferably, the mortise and tenon structure includes:

[0011] The dovetail grooves formed at the bottom of the two outer load-bearing bricks; and,

[0012] A tenon is provided on top of the inner anti-erosion brick and corresponds to the dovetail groove.

[0013] Preferably, the tenon groove inclination angle α is 50°-60°.

[0014] Preferably, a buffer layer is formed by filling the expansion gap with a material that has stress-buffering function.

[0015] Preferably, the thickness of the buffer layer is 1.5-5 mm.

[0016] Preferably, the material with stress-buffering function is ZrO2-SiO2 fiber paper; the thickness of the ZrO2-SiO2 fiber paper is 1.5-5 mm, and the porosity is 50-75%.

[0017] Preferably, the outer load-bearing brick is at least one of silica brick, sintered zirconia-corundum brick, electrofused AZS brick, and α-β corundum brick; the inner erosion-resistant brick is at least one of sintered zirconia-corundum brick, electrofused AZS brick, and α-β corundum brick.

[0018] Preferably, the thickness of the outer load-bearing brick is greater than or equal to the thickness of the inner erosion-resistant brick.

[0019] Preferably, the locking arch brick assembly consists of multiple locking arch bricks, wherein the locking arch bricks are at least one of silica bricks, sintered zirconia-corundum bricks, electrofused AZS bricks, and α-β corundum bricks.

[0020] Compared with the prior art, the present invention has at least the following technical effects:

[0021] (1) This utility model uses composite arch bricks in the arch brick groups on both sides of the glass melting furnace arch. The composite arch bricks are composed of an outer load-bearing brick and an inner anti-corrosion brick. Since the inner anti-corrosion brick has excellent anti-corrosion performance, the glass melting furnace arch can also have good anti-corrosion performance in a high-alkali environment.

[0022] (2) There is an expansion gap between the outer load-bearing brick and the inner anti-corrosion brick of this utility model. Due to the existence of the expansion gap, the glass melting furnace arch has the thermal expansion decoupling ability, which can significantly reduce the stress cracks caused by thermal expansion.

[0023] (3) Since the glass melting furnace arch provided by this utility model has good anti-corrosion performance and thermal expansion decoupling ability, it can prevent the generation of rat holes and avoid damage to the arch bricks. Therefore, it can improve the service life of the glass melting furnace arch and reduce maintenance costs. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the glass melting furnace arch described in this utility model;

[0025] Figure 2 This is a partial enlarged view of the dovetail groove described in this utility model;

[0026] Figure 3 This is a top view of the glass melting furnace arch described in this utility model.

[0027] Explanation of reference numerals in the attached figures

[0028] 1. Left arch brick assembly; 2. Right arch brick assembly; 3. Interlocking arch brick assembly; 4. Composite arch brick; 5. Outer load-bearing brick; 6. Inner erosion-resistant brick; 7. Expansion gap; 8. Interlocking arch brick; 9. Arch rubble brick. Detailed Implementation

[0029] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0030] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0031] The main improvement of the glass melting furnace arch provided by this utility model is that the arch brick is designed as a composite arch brick with an inner layer and an outer layer, and the inner and outer layers have different functions, while an expansion gap 7 is set between the inner and outer layers.

[0032] Specifically, such as Figure 1 and Figure 2 As shown, the glass melting furnace arch provided by this utility model includes a left arch brick group 1, a right arch brick group 2, and a locking arch brick group 3 located between the left arch brick group 1 and the right arch brick group. The left arch brick group 1 and the right arch brick group 2 are both composed of multiple composite arch bricks 4 arranged in sequence. The composite arch brick 4 includes an outer load-bearing brick 5 and an inner anti-erosion brick 6 located below the outer load-bearing brick 5. The outer load-bearing brick 5 and the inner anti-erosion brick 6 are detachably connected, and there is an expansion gap 7 between the outer load-bearing brick 5 and the inner anti-erosion brick 6.

[0033] In this utility model, the left arch brick group 1 refers to, as follows: Figure 1 The combination of multiple arch bricks located on the left side of the locking arch brick group 3 is shown. The arch brick group 2 on the right side refers to... Figure 1 The diagram shows a combination of multiple arch bricks located on the right side of the locking arch brick group 3. Further, the arrangement of the multiple composite arch bricks 4 in the left arch brick group 1 and the right arch brick group 2 can be in a manner common in the art.

[0034] In the composite arch brick 4, compared to the inner anti-erosion brick 6, the outer load-bearing brick 5 primarily functions as a load-bearing element and resists creep. Therefore, the outer load-bearing brick 5 can be made of various arch brick materials commonly found in the art. In some embodiments, the outer load-bearing brick 5 is at least one of silica brick, sintered zirconia-corundum brick, fused AZS brick, and α-β corundum brick. To save costs, the outer load-bearing brick 5 is preferably silica brick. Further, the outer load-bearing brick 5 can be a high-quality silica brick with a SiO2 content ≥96%. Even further, the apparent porosity of the outer load-bearing brick 5 is 16.2%, and its room temperature compressive strength is 38 MPa.

[0035] In the composite arch brick 4, compared to the outer load-bearing brick 5, the main function of the inner anti-erosion brick 6 is to ensure that the glass melting furnace arch has good anti-erosion and anti-scouring properties in a high-alkali environment. Therefore, the inner anti-erosion brick 6 needs to be an arch brick with anti-erosion brick 6. In some embodiments, the inner anti-erosion brick 6 can be at least one of sintered zirconia-corundum brick, electrofused AZS brick, and α-β corundum brick. Among them, the electrofused AZS brick has a ZrO2 content ≥32.5%, a SiO2 content ≤15.5%, and a load softening temperature >1700℃. Furthermore, different materials can be selected in different parts according to the usage environment. For example, the inner anti-erosion brick 6 in the melting zone of the melting section is made of electrofused AZS brick, the inner anti-erosion brick 6 in the clarification zone of the melting section is made of α-β corundum brick, the inner anti-erosion brick 6 in the regenerator arch is made of sintered sillimanite, and the inner anti-erosion brick 6 in the calender overflow port is made of sintered zirconia-corundum brick.

[0036] In this invention, to save costs, the thickness of the inner anti-erosion brick 6 does not need to be too thick. In some embodiments, the thickness of the outer load-bearing brick 5 is greater than or equal to the thickness of the inner anti-erosion brick 6. In some preferred embodiments, to ensure that the glass melting furnace arch has good anti-erosion and anti-scouring performance in a high-alkali environment, the thickness ratio of the outer load-bearing brick 5 to the inner anti-erosion brick 6 can be 4-5:1.

[0037] In this invention, the connection between the outer load-bearing brick 5 and the inner erosion-resistant brick 6 can be a detachable connection. To make the connection between the outer load-bearing brick 5 and the inner erosion-resistant brick 6 more secure, preventing them from separating and the composite structure from being damaged, in this invention, the outer load-bearing brick 5 and the inner erosion-resistant brick 6 can be connected by a mortise and tenon structure.

[0038] In one implementation, such as Figure 1 As shown, the mortise and tenon structure includes: a dovetail groove formed at the bottom of the two outer load-bearing bricks 5; and a tenon provided at the top of the inner anti-erosion brick 6 and corresponding to the dovetail groove.

[0039] In another embodiment, the mortise and tenon structure may also be configured as follows: a dovetail groove formed at the bottom of an outer load-bearing brick 5; and a tenon corresponding to the dovetail groove provided at the top of the inner anti-erosion brick 6.

[0040] In this invention, to ensure a stronger connection between the outer load-bearing brick 5 and the inner erosion-resistant brick 6, and to prevent their separation, the tenon groove inclination angle α can be 50°-60°. Wherein, the tenon groove inclination angle α is... Figure 2 The angle shown in the enlarged view of the dovetail groove.

[0041] In this invention, the expansion gap 7 is filled with a material that has stress-buffering function to form a buffer layer, so that the glass melting furnace arch has stress-buffering function and reduces stress cracks.

[0042] In a preferred embodiment, the thickness of the buffer layer can be 1.5-5mm. If the buffer layer is too thin, the inner anti-erosion brick 6 will expand too much, pushing open the outer load-bearing brick 5, causing the outer load-bearing brick 5 to crack and fail to bear the load. If the buffer layer is too thick, the outer load-bearing brick 5 will expand greatly, while the inner anti-erosion brick 6 will expand relatively little, which will pull open the expansion joint of the inner anti-erosion brick 6, allowing the flames to rise and directly burn the outer load-bearing brick 5, affecting the lifespan of the arch.

[0043] In this invention, the material used to form the buffer layer with stress-buffering function can be a flexible material commonly used in the art, such as fiber paper. In a preferred embodiment, the material with stress-buffering function is ZrO2-SiO2 fiber paper. Further, the ZrO2-SiO2 fiber paper has a thickness of 1.5-5 mm, a porosity of 50-75%, and a thermal conductivity ≤1.5 W / (m·K).

[0044] In this invention, the locking arch brick assembly 3 is composed of multiple locking arch bricks 8 made of a single material. The material is not limited, as long as it achieves the purpose of this invention. In some embodiments, the locking arch brick assembly 3 is composed of multiple locking arch bricks 8, and the locking arch bricks 8 are at least one of silica bricks, sintered zirconia-corundum bricks, electrofused AZS bricks, and α-β corundum bricks, preferably silica bricks.

[0045] The glass melting furnace arch described in this invention is particularly suitable for the arch top of high-temperature melting furnaces for float glass, photovoltaic glass, etc.

[0046] like Figure 1 As shown, arch ballast bricks 9 are provided on the left side of the left arch brick group 1 and on the right side of the right arch brick group 2. The material and laying method of the arch ballast bricks 9 can be selected using conventional methods in the art.

[0047] In this utility model, the construction method of the glass melting furnace arch includes: (1) positioning the wooden or steel structure arch; (2) building a ring of outer load-bearing bricks 5; (3) embedding a material with stress buffering function to form a buffer layer; (4) building a ring of inner anti-erosion bricks 6; (5) embedding a material with stress buffering function to form a buffer layer; (6) repeating the construction on both sides; (7) locking the arch bricks 8; (8) tightening the tie rod and removing the arch.

[0048] In a more specific implementation, such as Figure 1 and Figure 2As shown, the glass melting furnace arch includes a left arch brick group 1, a right arch brick group 2, and a locking arch brick group 3 located between the left arch brick group 1 and the right arch brick group 2. Arch bricks 9 are provided on the left side of the left arch brick group 1 and the right side of the right arch brick group 2. Both the left arch brick group 1 and the right arch brick group 2 are composed of multiple composite arch bricks 4 arranged sequentially. Each composite arch brick 4 includes an outer load-bearing brick 5 and a... The inner anti-erosion brick 6 below the outer load-bearing brick 5 is composed of at least one of silica brick, sintered zirconia-corundum brick, fused AZS brick, and α-β corundum brick, and the inner anti-erosion brick 6 is also composed of at least one of sintered zirconia-corundum brick, fused AZS brick, and α-β corundum brick. The thickness of the outer load-bearing brick 5 is greater than or equal to the thickness of the inner anti-erosion brick 6. The interlocking arch brick assembly 3 is composed of multiple interlocking arch bricks 8. The locking arch brick 8 is at least one of silica brick, sintered zirconia-corundum brick, fused AZS brick, and α-β corundum brick. The outer load-bearing brick 5 and the inner anti-corrosion brick 6 are connected by a mortise and tenon structure. The mortise and tenon structure includes a dovetail groove formed at the bottom of the two outer load-bearing bricks 5 and a tenon provided at the top of the inner anti-corrosion brick 6 and corresponding to the dovetail groove. The inclination angle α of the mortise and tenon is 50°-60°. There is an expansion gap 7 between the outer load-bearing brick 5 and the inner anti-corrosion brick 6. The expansion gap 7 is filled with a stress-buffering material to form a buffer layer. The thickness of the buffer layer is 1.5-5mm. The stress-buffering material is ZrO2-SiO2 fiber paper with a thickness of 1.5-5mm and a porosity of 50-75%. Figure 3 This is a top view of the glass melting furnace arch.

[0049] According to actual measurements of a 650t / d photovoltaic kiln of a listed company, compared with the glass melting furnace arch using single-material silica bricks, the glass melting furnace arch described in this invention extends the kiln life from 5.3 years to approximately 8.5 years, reduces the erosion rate from 0.28mm / month to approximately 0.09mm / month, significantly improving lifespan; the cost of a single hot repair decreases from 4.82 million yuan to approximately 1.15 million yuan, the utilization rate of residual bricks reaches approximately 85%, significantly reducing maintenance costs; and the heat dissipation from the arch top is reduced by approximately 12%, resulting in annual natural gas savings of ≥80,000 m³ / d. 3 Energy consumption is reduced.

[0050] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.

[0051] Example 1

[0052] like Figure 1 , Figure 2 and Figure 3As shown, the glass melting furnace arch includes a left arch brick group 1, a right arch brick group 2, and a locking arch brick group 3 located between the left arch brick group 1 and the right arch brick group 2. Arch bricks 9 are provided on the left side of the left arch brick group 1 and the right side of the right arch brick group 2. The left arch brick group 1 and the right arch brick group 2 are both composed of multiple composite arch bricks 4 arranged in sequence.

[0053] The composite arch brick 4 includes an outer load-bearing brick 5 and an inner anti-erosion brick 6 located below the outer load-bearing brick 5; the outer load-bearing brick 5 is a silica brick with a SiO2 content ≥96%, an apparent porosity of 16.2%, and a room temperature compressive strength of 38MPa; the inner anti-erosion brick 6 is an electrofused AZS brick, wherein the electrofused AZS brick has a ZrO2 content ≥32.5%, a SiO2 content ≤15.5%, and a load softening temperature >1700℃; the thickness ratio of the outer load-bearing brick 5 to the inner anti-erosion brick 6 is 1.5:1;

[0054] The locking assembly 3 is composed of multiple locking arch bricks 8, which are silica bricks with a SiO2 content ≥96%, an apparent porosity of 16.2%, and a room temperature compressive strength of 38MPa.

[0055] The outer load-bearing brick 5 and the inner anti-erosion brick 6 are connected by a mortise and tenon structure. The mortise and tenon structure includes a dovetail groove formed at the bottom of the two outer load-bearing bricks 5 and a tenon provided at the top of the inner anti-erosion brick 6 and corresponding to the dovetail groove. The inclination angle α of the mortise and tenon is 60°. There is an expansion gap 7 between the outer load-bearing brick 5 and the inner anti-erosion brick 6. The expansion gap 7 is filled with ZrO2-SiO2 fiber paper to form a buffer layer. The thickness of the buffer layer is 2 mm, and the thickness of the ZrO2-SiO2 fiber paper is 2 mm with a porosity of 60%.

[0056] Example 2

[0057] The difference from Example 1 is that the inner anti-erosion brick 6 is a sintered zirconia-corundum brick.

[0058] Example 3

[0059] The difference from Example 1 is that the inner anti-erosion brick 6 is an α-β corundum brick.

[0060] According to actual measurements of a 650t / d photovoltaic kiln from a listed company, compared to glass melting furnaces using single-material silica bricks, the glass melting furnace arch shown in this example extends the kiln life from 5.3 years to approximately 8.5 years, reduces the erosion rate from 0.28mm / month to approximately 0.09mm / month, significantly extending its lifespan; the cost of a single hot repair decreases from 4.82 million yuan to approximately 1.15 million yuan, the utilization rate of residual bricks reaches approximately 85%, significantly reducing maintenance costs; and the heat dissipation from the arch top is reduced by approximately 12%, resulting in annual natural gas savings of ≥80,000 m³ / h. 3 Energy consumption is reduced.

[0061] It should be understood that any parts not described in detail in this specification belong to the prior art.

[0062] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed by this utility model and are all within the protection scope of this utility model.

Claims

1. A glass melting furnace arch, comprising a left arch brick group (1), a right arch brick group (2), and a locking arch brick group (3) located between the left arch brick group (1) and the right arch brick group (2), characterized in that, The left arch brick group (1) and the right arch brick group (2) are both composed of multiple composite arch bricks (4) arranged in sequence. The composite arch brick (4) includes an outer load-bearing brick (5) and an inner anti-erosion brick (6) located below the outer load-bearing brick (5). The outer load-bearing brick (5) and the inner anti-erosion brick (6) are detachably connected. There is an expansion gap (7) between the outer load-bearing brick (5) and the inner anti-erosion brick (6).

2. The glass melting furnace archway according to claim 1, characterized in that, The outer load-bearing brick (5) and the inner erosion-resistant brick (6) are detachably connected by a mortise and tenon structure.

3. The glass melting furnace archway according to claim 2, characterized in that, The mortise and tenon structure includes: The dovetail grooves formed at the bottom of the two outer load-bearing bricks (5); and, A tenon is provided on top of the inner anti-erosion brick (6) and corresponds to the dovetail groove.

4. The glass melting furnace archway according to claim 1, characterized in that, The expansion gap (7) is filled with a material that has stress buffering function to form a buffer layer.

5. The glass melting furnace arch according to claim 4, characterized in that, The thickness of the buffer layer is 1.5-5mm.

6. The glass melting furnace arch according to claim 4, characterized in that, The material with stress-buffering function is ZrO2-SiO2 fiber paper; The ZrO2-SiO2 fiber paper has a thickness of 1.5-5 mm and a porosity of 50-75%.

7. The glass melting furnace arch according to claim 1, characterized in that, The outer load-bearing brick (5) is at least one of silica brick, sintered zirconia-corundum brick, electrofused AZS brick and α-β corundum brick; The inner anti-erosion brick (6) is at least one of sintered zirconia-corundum brick, electrofused AZS brick and α-β corundum brick.

8. The glass melting furnace archway according to claim 1 or 7, characterized in that, The thickness of the outer load-bearing brick (5) is greater than or equal to the thickness of the inner erosion-resistant brick (6).

9. The glass melting furnace arch according to claim 1, characterized in that, The locking arch brick group (3) is composed of multiple locking arch bricks (8), and the locking arch bricks (8) are at least one of silica bricks, sintered zirconia-corundum bricks, electrofused AZS bricks and α-β corundum bricks.

Images