Special-shaped substrate glass clarifying tube, clarifying method and clarifying channel

Abstract

The invention relates to the technical field of substrate glass manufacturing, in particular to a special-shaped substrate glass clarification tube, clarification method and clarification channel, the special-shaped substrate glass clarification tube comprises an upper half tube wall and a lower half tube wall communicated with the upper half tube wall, and the conditions that the flow velocity of molten glass is the same, when L1 = L2, S1 = S2 and H1 is smaller than H2 are met, L1, H1 and S1 are the length of the special-shaped substrate glass clarification tube, the height of the liquid level and the sectional area of the molten glass respectively, l2, H2 and S2 are the length, the liquid level height and the sectional area of molten glass of the standard round glass clarifying tube respectively, and the cross section of the standard round glass clarifying tube is a circle with the same radius as the arc-shaped tube wall of the upper half tube wall. Under the condition that enough residence time needed by clarification is guaranteed, the structural strength of the platinum pipeline is considered, the clarification pipe section with the arc upper portion and the special-shaped lower portion is designed, the most efficient bubble discharging capacity is achieved, the bubble discharging efficiency is improved, and the substrate glass production capacity is improved. The problem that an existing clarification pipe is poor in clarification effect is solved.

Description

Technical Field

[0001] The invention relates to the technical field of substrate glass manufacturing, in particular to a special-shaped substrate glass clarification tube, a clarification method and a clarification channel. Background Art

[0002] The manufacturing process of substrate glass mainly includes batching, melting, clarification, homogenization, feeding, overflow, molding, annealing, etc., which are mainly undertaken by the three major systems of kiln, channel and molding. As the manufacturing of substrate glass continues to develop in the direction of large size, large flow and refinement, higher requirements are also placed on the capabilities of various system equipment. The platinum channel is the system equipment with the largest horizontal span, the highest construction cost and the most control points among the three hot end systems. The section responsible for clarification is the highest area of ​​channel temperature operation, with an actual temperature of 1650°C. This is mainly to create a smaller viscosity condition for the discharge of bubbles in the glass liquid, so that the bubbles have the minimum resistance to floating upward, which is in line with the calculation principle of the Stokes formula.

[0003] At present, the pipe body of the clarification section generally adopts a circular structure. The liquid level of the glass is closely related to the diameter, and the diameter of the pipe body is fixed. The adjustment method of the liquid level of the glass can only be achieved by changing the volume of the glass, that is, the volume of the glass liquid in the clarification section can be reduced to reduce the liquid level of the glass. However, this method will directly affect the retention time of the glass liquid in the clarification pipe, and indirectly weaken the clarification ability. In addition, the main material of the clarification pipe is platinum-rhodium alloy, which is expensive. The pipe diameter and length cannot be simply enlarged due to the increase in glass flow, which puts higher requirements on the cost or plant layout. Summary of the invention

[0004] In view of the problem that the clarification tube in the prior art has a poor clarification effect, the present invention provides a special-shaped substrate glass clarification tube, a clarification method and a clarification channel.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a special-shaped substrate glass clarification tube, comprising an upper tube wall and a lower tube wall, wherein the upper tube wall is connected to the lower tube wall; the upper tube wall is an arc tube wall, and the special-shaped substrate glass clarification tube meets the following conditions: When the glass liquid flow rate is the same, L1=L2, S1=S2 and H1<H2: wherein, L1 is the length of the special-shaped substrate glass clarification tube, L2 is the length of the standard round glass clarification tube, S1 is the cross-sectional area of ​​the glass liquid in the special-shaped substrate glass clarification tube, S2 is the cross-sectional area of ​​the glass liquid in the standard round glass clarification tube, H1 is the liquid level height in the special-shaped substrate glass clarification tube, H2 is the liquid level height in the standard round glass clarification tube, and the cross-section of the standard round glass clarification tube is a circle with the same radius as the arc-shaped tube wall of the upper half of the tube wall.

[0006] Furthermore, the upper tube wall and the lower tube wall are integrated.

[0007] Furthermore, the cross-section of the lower half tube wall is rectangular.

[0008] Furthermore, the lower half of the tube wall is provided with a chamfer.

[0009] Furthermore, the lower half tube wall is an elliptical structure, and the major axis radius of the elliptical structure is greater than the arc tube wall radius of the upper half tube wall.

[0010] Furthermore, the radius of the arc-shaped tube wall of the upper tube wall is 150-200 mm, and the wall thickness of the upper tube wall is 1-2 mm.

[0011] The present invention also provides a method for clarifying substrate glass liquid using the above-mentioned clarification tube, comprising: Heating the substrate glass liquid; The heated substrate glass liquid is introduced into a clarification tube for clarification and bubble removal to complete the clarification of the substrate glass.

[0012] Furthermore, during clarification and degassing, the glass liquid flow rate is ≥900kg / h and the residence time is ≥45min.

[0013] Furthermore, the heating temperature is 1600°C to 1650°C. When the heated substrate glass liquid is introduced into the clarification tube, the liquid level in the special-shaped substrate glass clarification tube is 200mm to 300mm, and the glass liquid cross-section is ≥800cm².

[0014] A glass liquid clarification channel comprises the above-mentioned special-shaped substrate glass clarification tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a special-shaped substrate glass clarification tube, comprising an upper tube wall and a lower tube wall. The upper tube wall is set as an arc structure, so that in the process of basic glass liquid clarification, a space area on which glass liquid is placed can be accommodated, and a gas channel for the glass liquid to discharge bubbles can be established. At the same time, the tube can be operated for a long time without collapse under the condition of 1650°C. The lower tube wall is set as a special-shaped structure connected to the upper tube wall, which is mainly used to carry glass liquid to form a clarification pool. The lower tube wall is set by calculation to meet the conditions that when the glass liquid flow rate is the same, L1=L2, S1=S2 and H1<H2. Under the condition that the retention time of the glass liquid and the cross-sectional area of ​​the glass liquid surface are not affected, that is, under the condition that the optimal clarification process is not changed, the height of the clarified glass liquid surface can be reduced, and the bubble floating path and time can be shortened, thereby simultaneously meeting the requirements of clarification capacity and cost or space share, achieving efficient clarification to the greatest extent, and playing a significant role in improving the production capacity of substrate glass.

[0016] The upper tube wall and the lower tube wall are integrated to ensure the structural strength, sealing, maintenance cost and overall aesthetics of the special-shaped substrate glass clarification tube.

[0017] The cross section of the lower half tube wall is a rectangular or elliptical structure, which is convenient for calculation and design and helps to reduce casting costs.

[0018] The radius of the arc tube wall of the upper tube wall is 150-200 mm, and the wall thickness of the upper tube wall is 1-2 mm, which ensures the stability of the structure while establishing a gas channel for the glass liquid to discharge bubbles.

[0019] The present invention also provides a method for clarifying substrate glass liquid using the above-mentioned clarification tube. The method heats the substrate glass liquid and introduces it into the clarification tube to clarify and remove bubbles, thereby completing the clarification of the substrate glass. The method is simple, does not require redesign of the existing clarification process, and is low in cost.

[0020] When clarifying and degassing, the glass liquid flow rate should be ≥900kg / h and the residence time should be ≥45min to ensure efficient degassing and clarification.

[0021] The heating temperature is 1600℃~1650℃. When the heated substrate glass liquid is introduced into the clarification tube, the liquid level in the special-shaped substrate glass clarification tube is 200mm~300mm, and the glass liquid cross-section is ≥800cm², which further ensures the bubble removal and clarification efficiency.

[0022] The present invention provides a glass liquid clarification channel, comprising the above-mentioned special-shaped substrate glass clarification tube. The glass liquid clarification channel has better clarification efficiency, simple structure and low modification cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the glass liquid level and structure of a standard round glass clarification tube.

[0024] Figure 2 Schematic diagram of the glass liquid level and structure of the special-shaped substrate glass clarification tube of Example 1 of the present invention.

[0025] Figure 3 Schematic diagram of the glass liquid level and structure of the special-shaped substrate glass clarification tube of Example 2 of the present invention.

[0026] Among them, 1-upper half of the tube wall, 2-lower half of the tube wall. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0030] See also Figure 1, the circular cross-section diagram of the existing clarification tube is the currently commonly used solution. The circular tube has structural advantages, is easy to manufacture and process, has a relatively uniform overall stress distribution, and has a relatively stable structure during the temperature rise and expansion process. It has been a cross-sectional structure used for a long time and is also the cross-sectional form used in most areas of the platinum channel. The clarification ability of the glass liquid represents the ability of the glass liquid to discharge internal bubbles in this area. After the glass liquid is melted in the kiln, the uniform glass liquid formed flows into the clarification tube. At this time, the temperature reaches above 1600°C, and the viscosity of the glass liquid in the clarification tube also reaches below 300 poise, which meets the basic conditions for bubble discharge. According to Stokes' law, the rising speed of the bubble is proportional to the square of the radius of the bubble and inversely proportional to the viscosity of the glass. First of all, the increase in the radius of the bubble has two factors under isothermal and isobaric conditions. One is that multiple small bubbles gather into a large bubble, and the other is that the gas dissolved in the glass liquid penetrates into the bubble to expand it. The first situation generally does not occur, mainly because the small bubbles are far away from each other and the surface tension of the glass liquid is large, which will hinder the aggregation of small bubbles; the second situation is practical. The greater the degree of supersaturation of the dissolved gas in the glass liquid, the lower the partial pressure of the gas in the bubble, and the easier it is for the gas to enter the bubble from the glass liquid. When the bubble grows, its rising speed increases, and it can quickly float out of the glass liquid surface. In addition, the lower the viscosity of the glass, the smaller the surface tension it produces on the bubble, and the easier it is for the bubble to float.

[0031] The above two factors analyze the impact of material properties on clarification. In terms of equipment structure, the cross-section and length of the clarification tube also have an important impact on the clarification effect. The main core is the residence time of the glass liquid in the clarification tube and the liquid level of the glass liquid. Similarly, for two clarification tubes, when the tube length L is the same and the glass liquid cross-sectional area is the same, the residence time T is the same. At this time, the only indicator affecting the clarification ability is the liquid level of the glass liquid in the tube. Based on this principle, the present invention proposes a special-shaped substrate glass clarification tube, comprising an upper tube wall 1 and a lower tube wall 2, wherein the upper tube wall 1 is connected to the lower tube wall 2; the upper tube wall 1 is an arc-shaped tube wall, and when the glass liquid flow rate is the same, L1=L2, S1=S2 and H1<H2: wherein L1 is the length of the special-shaped substrate glass clarification tube, L2 is the length of the standard round glass clarification tube, S1 is the cross-sectional area of ​​the glass liquid in the special-shaped substrate glass clarification tube, S2 is the cross-sectional area of ​​the glass liquid in the standard round glass clarification tube, H1 is the liquid level in the special-shaped substrate glass clarification tube, H2 is the liquid level in the standard round glass clarification tube, and the cross-section of the standard round glass clarification tube is a circle with the same radius as the arc-shaped tube wall of the upper tube wall 1.

[0032] By setting the upper tube wall 1 as an arc structure, the space area on the glass liquid can be accommodated during the basic glass liquid clarification process, and a gas channel for the glass liquid to discharge bubbles can be established. At the same time, it can operate for a long time without collapse under 1650°C conditions; by setting the lower tube wall 2 as a special-shaped structure connected to the upper tube wall 1, it is mainly used to carry the glass liquid to form a clarification tank. The lower tube wall is set by calculation to meet the conditions that when the glass liquid flow rate is the same, L1=L2, S1=S2 and H1<H2. Under the condition of not affecting the glass liquid residence time and the glass liquid surface cross-sectional area, that is, without changing the optimal clarification process, the height of the clarified glass liquid surface can be reduced, the bubble floating path and time can be shortened, and the requirements of clarification capacity and cost or space share can be met at the same time, and efficient clarification can be achieved to the greatest extent, which will play a significant role in improving the substrate glass production capacity.

[0033] Example 1 See also Figure 2 The present invention provides a special-shaped substrate glass clarification tube, comprising an upper tube wall 1 and a lower tube wall 2, wherein the upper tube wall 1 is connected to the lower tube wall 2; the upper tube wall 1 and the lower tube wall 2 are integrated; the upper tube wall 1 is an arc-shaped tube wall, and the lower tube wall 2 is a rectangular structure, on which a chamfer is arranged; when the flow rates of the glass liquid are the same, L1=L2, S1=S2 and H1<H2: wherein L1 is the length of the special-shaped substrate glass clarification tube, L2 is the length of the standard round glass clarification tube, S1 is the cross-sectional area of ​​the glass liquid in the special-shaped substrate glass clarification tube, S2 is the cross-sectional area of ​​the glass liquid in the standard round glass clarification tube, H1 is the liquid level height in the special-shaped substrate glass clarification tube, H2 is the liquid level height in the standard round glass clarification tube, and the cross-section of the standard round glass clarification tube is a circle with the same radius as the arc-shaped tube wall of the upper tube wall 1. For example: when the diameter of the standard round glass clarification tube is 350mm, when the glass liquid is clarified, the liquid level of the internal glass liquid is 316mm, and the remaining height at the top is the gas channel for the glass liquid to discharge bubbles. When the glass liquid flow rate is the same, L1=L2, S1=S2, and the lower half of the tube wall 2 is a rectangular structure, and the maximum liquid level is reduced to below 300mm, with a lower glass liquid level, and the bubble floating path and time are shorter. It has been tested that the bubble removal efficiency can be increased by nearly 25%.

[0034] Preferably, the radius of the arc-shaped tube wall of the upper tube wall 1 is 150-200 mm, and the wall thickness of the upper tube wall 1 is 1-2 mm.

[0035] Example 2 See also Figure 3The present invention provides a special-shaped substrate glass clarification tube, comprising an upper tube wall 1 and a lower tube wall 2, wherein the upper tube wall 1 is connected to the lower tube wall 2; the upper tube wall 1 and the lower tube wall 2 are integrally arranged; the upper tube wall 1 is an arc-shaped tube wall, and the lower tube wall 2 is an elliptical structure, wherein the major axis radius of the elliptical structure is greater than the radius of the arc-shaped tube wall of the upper tube wall 1, and when the glass liquid flow rate is the same, L1=L2, S1=S2 and H1<H2: wherein L1 is the length of the special-shaped substrate glass clarification tube, L2 is the length of the standard round glass clarification tube, S1 is the cross-sectional area of ​​the glass liquid in the special-shaped substrate glass clarification tube, S2 is the cross-sectional area of ​​the glass liquid in the standard round glass clarification tube, H1 is the liquid level height in the special-shaped substrate glass clarification tube, H2 is the liquid level height in the standard round glass clarification tube, and the cross-section of the standard round glass clarification tube is a circle with the same radius as the arc-shaped tube wall of the upper tube wall 1. For example, when the diameter of the standard round glass clarification tube is 350mm, when the glass liquid is clarified, the liquid level of the internal glass liquid is 316mm, and the remaining height on the top is the gas channel for the glass liquid to discharge bubbles. When the glass liquid flow rate is the same, L1=L2, make S1=S2. Since the lower half of the tube wall 2 is a flat tube with a larger diameter and an elliptical structure, the maximum liquid level is significantly reduced, and the bubble floating path and time become shorter. According to the test, the bubble discharge efficiency can be increased by nearly 30%, and since the bottom is also an arc structure, compared with Figure 2 , better stability.

[0036] Preferably, the radius of the arc-shaped tube wall of the upper tube wall 1 is 150-200 mm, and the wall thickness of the upper tube wall 1 is 1-2 mm.

[0037] The present invention also provides a method for clarifying substrate glass liquid using the above-mentioned clarification tube, which is specifically: First, the substrate glass liquid is heated to 1600℃~1650℃; then, the heated substrate glass liquid is introduced into the clarification tube for clarification and bubble removal to complete the clarification of the substrate glass. When the clarification and bubble removal are performed, the glass liquid flow rate is ≥900kg / h, the retention time is ≥45min, the liquid level in the clarification tube for the special-shaped substrate glass is 200mm~300mm, and the glass liquid cross-section is ≥800cm². The method is simple, does not require the redesign of the existing clarification process, and is low in cost.

[0038] The present invention also provides a glass liquid clarification channel, comprising the above-mentioned special-shaped substrate glass clarification tube. The glass liquid clarification channel has better clarification efficiency, simple structure and low modification cost.

[0039] In summary, the present invention provides a special-shaped substrate glass clarification tube, a clarification method and a clarification channel. Under the condition of not affecting the liquid surface flow rate and the cross-sectional area during the clarification process, that is, ensuring a sufficient residence time required for clarification, the structural strength of the platinum pipe is taken into consideration, and the clarification tube cross-section with an upper arc and a lower special-shaped structure is designed to achieve the most efficient bubble removal capacity, improve the bubble removal efficiency, and improve the substrate glass production capacity.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to impose any limitation on the technical solution of the present invention. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can also be subjected to several simple modifications and substitutions, and these modifications and substitutions are also within the scope of protection covered by the claims.

Claims

1. A special-shaped substrate glass clarification tube, characterized in that: The glass clarification tube comprises an upper tube wall (1) and a lower tube wall (2), wherein the upper tube wall (1) is connected to the lower tube wall (2); the upper tube wall (1) is an arc-shaped tube wall, and the special-shaped substrate glass clarification tube meets the following conditions: When the glass liquid flow rate is the same, L1=L2, S1=S2 and H1<H2: wherein L1 is the length of the special-shaped substrate glass clarification tube, L2 is the length of the standard round glass clarification tube, S1 is the cross-sectional area of ​​the glass liquid in the special-shaped substrate glass clarification tube, S2 is the cross-sectional area of ​​the glass liquid in the standard round glass clarification tube, H1 is the liquid level height in the special-shaped substrate glass clarification tube, H2 is the liquid level height in the standard round glass clarification tube, and the cross-section of the standard round glass clarification tube is a circle with the same radius as the arc-shaped tube wall of the upper half tube wall (1).

2. The special-shaped substrate glass clarification tube according to claim 1, characterized in that: The upper tube wall (1) and the lower tube wall (2) are arranged in an integrated manner.

3. The special-shaped substrate glass clarification tube according to claim 1, characterized in that: The cross section of the lower half tube wall (2) is rectangular.

4. The special-shaped substrate glass clarification tube according to claim 3, characterized in that: The lower half tube wall (2) is provided with a chamfer.

5. The special-shaped substrate glass clarification tube according to claim 1, characterized in that: The lower tube wall (2) is an elliptical structure, and the major axis radius of the elliptical structure is greater than the arc tube wall radius of the upper tube wall (1).

6. The special-shaped substrate glass clarification tube according to claim 1, characterized in that: The arc-shaped tube wall radius of the upper tube wall (1) is 150 to 200 mm, and the wall thickness of the upper tube wall (1) is 1 to 2 mm.

7. A method for clarifying substrate glass liquid using the clarification tube according to any one of claims 1 to 6, characterized in that: include: Heating the substrate glass liquid; The heated substrate glass liquid is introduced into a clarification tube for clarification and bubble removal to complete the clarification of the substrate glass.

8. The method for clarifying substrate glass liquid according to claim 7, characterized in that: When clarifying and defoaming, the glass liquid flow rate is ≥900kg / h and the residence time is ≥45min.

9. The method for clarifying substrate glass liquid according to claim 7, characterized in that: The heating temperature is 1600℃~1650℃. When the heated substrate glass liquid is introduced into the clarification tube, the liquid level in the special-shaped substrate glass clarification tube is 200mm~300mm, and the glass liquid cross-section is ≥800cm².

10. A glass liquid clarification channel, characterized in that: A glass clarification tube with a special-shaped substrate comprising any one of claims 1-6.

Images