Molten glass filtering and discharging test furnace

Abstract

The invention relates to a molten glass filtering and unloading test furnace, which comprises a furnace body, the lower part of the furnace body is provided with an unloading outlet and an emptying outlet, the unloading outlet is externally connected with an unloading pipeline, and the emptying outlet is externally connected with an emptying pipeline; a height difference exists between the discharging outlet and the emptying outlet in the vertical direction, and the discharging outlet is higher than the emptying outlet. And when the furnace body is filled with molten glass, the discharging outlet is higher than a precipitation layer of the glass, and the emptying outlet is lower than the precipitation layer of the glass. According to the test furnace disclosed by the invention, when each furnace normally discharges, clean molten glass with a relatively high liquid level is discharged through the discharging outlet and the discharging pipeline, so that the quality of the molten glass is guaranteed, and the yield is guaranteed; after normal discharging of each furnace is finished, lower-layer molten glass containing impurities and crystals is discharged through the emptying outlet and the emptying pipeline to be emptied, accumulation of the impurities and the crystals is avoided, only the molten glass between the discharging outlet and the emptying outlet of each furnace is emptied, the amount is small, furnace washing operation is not needed after multiple furnaces are used, the input and output proportion is guaranteed, and the yield of good products is high.

Description

Technical Field

[0001] The invention belongs to the technical field of glass manufacturing and forming in chemistry and metallurgy, and in particular relates to a molten glass filtering and unloading test furnace. Background Art

[0002] Before a new glass material is put into production, a test furnace is generally required for trial production. The test furnace includes a kiln body made of platinum or platinum alloy with an open top, a discharge hole is opened on the bottom wall of the kiln body, and a platinum discharge pipe is connected to the bottom of the kiln body. One end of the platinum discharge pipe is connected to the outer side of the bottom wall of the kiln body and communicates with the discharge hole directly, and the other end extends vertically downward to form a discharge port. The kiln body and the discharge pipe are provided with necessary heating and heat preservation mechanisms. When in use, molten glass liquid is formed in the kiln body through the heating and insulation mechanism. There are usually two problems that easily affect the product yield: one is the presence of impurities in the glass liquid at the bottom of the kiln body; the other is that since the heating and insulation mechanism (such as heating flange, etc.) is connected to the side of the kiln body, the bottom temperature of the kiln body generally has a temperature drop of about 70°C. For glass materials that are easy to crystallize, a crystallization layer of a certain thickness is easily formed in the glass liquid at the bottom of the kiln body. When unloading, the bottom glass liquid containing impurities and crystallization is easy to flow out through the discharge hole and the platinum unloading pipe, which will affect the quality of subsequent finished products. In addition, as the thickness of the crystallization layer formed at the bottom of each furnace of glass liquid accumulates, the impact on the yield rate of subsequent finished products will become increasingly greater. Taking the example of easy-to-crystallize glass material, in which about 10mm (depth) of glass liquid forms crystallization at the bottom of the kiln body in each furnace, 50% of the crystallization layer flows into the product in each furnace during the unloading process, and the yield rate is about 70%; after about five furnaces, there is about 25mm of accumulated crystallization at the bottom of the kiln body, resulting in almost all the glass produced being crystallization, and no good products can be produced. At this time, at least three furnaces of fusible glass are required to wash the furnace, resulting in a very low raw material input and output ratio and poor production efficiency. Calculated at (70%×5) / 8=43.75%, the yield rate is no higher than 43.75%.

[0003] In the prior art, the glass production schemes of Chinese patent applications CN201520790938.8 and 202211638829.5 adopt auxiliary heating to avoid crystallization or material replacement. The improvement implementation process is relatively complicated, and no improvement is considered from the unloading structure to solve the above problems. In the glass liquid clarification device of CN201910328200.2, a discharge pipe for discharging impurities is provided at the bottom of the clarification tank, and a notch for overflowing the upper glass liquid is provided at the top end of the clarification tank. If applied to the kiln body of the test furnace, the distance between the top overflow notch and the bottom discharge pipe is too large, and the amount of glass liquid between the two is large. It is inconvenient to control the discharge amount when removing impurities in each furnace. If a small amount is discharged, it may affect the yield of the next furnace due to incomplete impurity removal and cause crystallization accumulation. If all the glass liquid is discharged, excessive discharge will affect the input and output ratio of raw materials. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a molten glass filtering and unloading test furnace to avoid the problem that the bottom glass liquid is affected by sedimentation and crystallization, affecting the quality of the finished product and the input-output ratio (yield of good products) is low, so as to achieve the effect of improving quality and increasing efficiency.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A molten glass filtering and unloading test furnace comprises a kiln body, wherein the lower part of the kiln body is provided with a unloading outlet and an emptying outlet, wherein the unloading outlet is externally connected to a unloading pipe, and the emptying outlet is externally connected to an emptying pipe; the unloading outlet and the emptying outlet have a vertical height difference and the unloading outlet is higher than the emptying outlet.

[0006] To further improve the above technical solution, the kiln body includes a circle of side walls and a bottom wall sealed and connected to the bottom end of the circle of side walls; The upper end of the discharge pipe is communicated with the inner cavity of the kiln body through the discharge outlet, and the lower end of the discharge pipe extends downward to form a discharge port.

[0007] Further, the emptying outlet is opened on the bottom wall, the upper end of the emptying pipe is connected to the emptying outlet, the upper end of the emptying pipe is not higher than the upper edge of the emptying outlet, and the lower end of the emptying pipe extends downward to form an emptying outlet. Alternatively, the upper end of the emptying pipe extends into the kiln body through the emptying outlet, and ensures that the upper end of the emptying pipe is lower than the discharge outlet.

[0008] Optionally, the upper end of the discharge pipe is sealed and passes through the bottom wall, and the discharge outlet is formed by the upper end portion of the discharge pipe.

[0009] Optionally, the discharge outlet is opened at the lower part of the side wall of the kiln body, and the upper end of the discharge pipe is sealed and connected to the side wall and communicates with the discharge outlet.

[0010] The discharge outlet is externally connected to a 90° elbow and is connected to a discharge pipeline extending downward.

[0011] Furthermore, the inner side surface of the bottom wall is an inclined surface which gradually decreases toward the position of the emptying outlet.

[0012] Optionally, the emptying outlet is located in the middle of the bottom wall, and on a vertical section through the center of the emptying outlet, with the center of the emptying outlet as the vertex of the angle, the angle between the inner side surfaces of the bottom wall on both sides of the angle is 135-180°.

[0013] Optionally, the emptying outlet is spaced apart from the middle position of the bottom wall, and on a vertical section through the center of the emptying outlet, between the emptying outlet and the adjacent side wall, the angle between the inner side surface of the bottom wall and the vertical line is 0 to 90°, and between the emptying outlet and the farther side wall, the angle between the inner side surface of the bottom wall and the vertical line is 45 to 90°.

[0014] Optionally, the emptying outlet is opened at a middle position of the bottom wall, and the inner side surface of the bottom wall is an inclined surface which gradually descends toward the position of the emptying outlet; the discharge outlet is opened at an edge position of the bottom wall so that it is higher than the emptying outlet, and the upper end of the discharge pipe is sealed and connected to the bottom wall and communicated with the discharge outlet.

[0015] Furthermore, the discharge outlet is 20 to 100 mm higher than the emptying outlet.

[0016] Furthermore, the height of the kiln body is greater than 350-450 mm, and the inner diameter of the kiln body is 250-350 mm.

[0017] Furthermore, the discharge pipe and / or the emptying pipe is formed by sealingly connecting a number of pipe sections with decreasing diameters downward, with a total length of 300 to 2000 mm, and the inner diameter of the top pipe section is 10 to 50 mm.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a molten glass filtering and unloading test furnace. When each furnace is discharging normally, clean glass liquid with a relatively high liquid level is discharged from the upper portion through the discharging outlet and the discharging pipe, so as to ensure the quality of the glass liquid and guarantee the yield rate. After each furnace is discharged normally, the glass liquid containing sediment and crystallization in the lower layer is discharged through the emptying outlet and the emptying pipe for emptying, so as to avoid the accumulation of sediment and crystallization. Only the glass liquid between the discharging outlet and the emptying outlet is emptied in each furnace, and the amount is small. After multiple furnaces are used, there is no need for the existing furnace washing operation, so as to ensure the input-output ratio and the yield rate of good products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a molten glass filtering and unloading test furnace according to Example 1; Figure 2 This is a schematic structural diagram of a molten glass filtering and unloading test furnace according to Example 2; Figure 3 This is a schematic structural diagram of a molten glass filtering and unloading test furnace according to Example 3; Figure 4 This is a schematic structural diagram of a molten glass filtering and unloading test furnace according to the fourth embodiment; Among them, the kiln body 1, the side wall 11, the bottom wall 12, the discharge outlet 2, the emptying outlet 3, the discharge pipe 4, the discharge port 41, the emptying pipe 5, the emptying outlet 51, and the elbow 6. DETAILED DESCRIPTION

[0020] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] Embodiment 1 See also Figure 1 , a molten glass filtering and unloading test furnace of embodiment 1 comprises a furnace body 1, the lower part of the furnace body 1 is provided with a discharge outlet 2 and an emptying outlet 3, the discharge outlet 2 is externally connected to a discharge pipe 4, the emptying outlet 3 is externally connected to an emptying pipe 5; the discharge outlet 2 and the emptying outlet 3 have a height difference in the vertical direction and the discharge outlet 2 is higher than the emptying outlet 3. When the furnace body 1 is filled with molten glass liquid, the discharge outlet 2 is higher than the sedimentation layer of the glass liquid, and the emptying outlet 3 is lower than the sedimentation layer of the glass liquid.

[0022] In the molten glass filtration and unloading test furnace of this embodiment, when each furnace is discharged normally, the clean glass liquid above the relatively high liquid level is discharged through the discharge outlet 2 and the discharge pipe 4 to ensure the quality of the glass liquid and the yield rate; after the normal discharge of each furnace is completed, the glass liquid containing impurities and crystallization in the lower layer is discharged through the emptying outlet 3 and the emptying pipe 5 for emptying to avoid the accumulation of impurities and crystallization. Each furnace only empties the glass liquid between the discharge outlet 2 and the emptying outlet 3. The amount is small and there is no need for the existing furnace washing operation after multiple furnaces are used, which ensures the input-output ratio and high yield. It can be understood that the discharge pipe 4 and the emptying pipe 5 are respectively provided with stop valves (not shown in the figure) so as to open and close as needed. During manufacturing, the materials of the kiln body 1, the discharge pipe 4 and the emptying pipe 5 are selected from platinum metal or platinum-rhodium alloy, and the specific positions of the discharge outlet 2 and the emptying outlet 3 at the bottom of the kiln body 1 are not limited.

[0023] Please see again Figure 1The kiln body 1 includes a circle of side walls 11 and a bottom wall 12 sealed and connected to the bottom end of the circle of side walls 11. In this embodiment, the bottom wall 12 is flat. The upper end of the discharge pipe 4 is sealed and passes through the bottom wall 12 at the edge of the bottom wall 12. The discharge outlet 2 is formed through the upper end of the discharge pipe 4. The lower end of the discharge pipe 4 extends downward to form a discharge port 41. The emptying outlet 3 is opened on the bottom wall 12 and is located in the middle position. The upper end of the emptying pipe 5 is sealed and connected to the bottom wall 12 and communicates with the emptying outlet 3. The lower end of the emptying pipe 5 extends downward to form an emptying outlet 51. The upper end of the emptying pipe 5 is not higher than the upper edge of the emptying outlet 3. After the normal discharge of each furnace is completed, the glass liquid at the bottom of the kiln body 1 can be completely emptied during emptying.

[0024] In this embodiment, the discharge pipe 4 is connected to the bottom wall 12 of the kiln body 1, which can achieve the above-mentioned effects while reducing the occupation of the circumferential space.

[0025] In one embodiment, the upper end of the emptying pipe 5 also extends into the kiln body 1 through the emptying outlet 3. As long as the upper end of the emptying pipe 5 is lower than the sedimentation layer, the upper clean glass liquid can still be discharged through the discharge outlet 2 when in use. The relatively low emptying pipe 5 can discharge the glass liquid of the lower sedimentation layer, and the emptying effect is not as good as the form in which the upper end of the emptying pipe 5 is flush with the emptying outlet 3. However, the sedimentation layer in the kiln body 1 can be discharged to a large extent, and the discharge outlet 2 can discharge a large amount of clean glass liquid, ensuring the quality of the glass liquid and the yield rate. Furthermore, the upper end of the emptying pipe 5 is sealed and threadedly connected to the emptying outlet 3, and the length of the upper end of the emptying pipe 5 extending into the kiln body 1 can be freely adjusted according to the depth of the sedimentation layer to ensure the discharge effect of the sedimentation layer.

[0026] Embodiment 2 The molten glass filtration and unloading test furnace of the second embodiment is different from that of the first embodiment in the connection form and position of the unloading pipe 4, and the morphology of the bottom wall 12. Figure 2 In the second embodiment, the discharge outlet 2 is opened at the lower part of the side wall 11 of the kiln body 1 , and the upper end of the discharge pipe 4 is sealed and connected to the side wall 11 and communicates with the discharge outlet 2 .

[0027] In this way, it is convenient to modify the system by opening a discharge outlet 2 on the side wall 11 of the furnace body 1 above the glass liquid precipitation layer and connecting the discharge pipe 4. The discharge pipe 4 extends vertically, and the upper end can be bent and horizontally sealed and connected to the side wall 11 of the furnace body 1, and communicated with the discharge outlet 2.

[0028] During implementation, a 90° elbow 6 can be connected to the discharge outlet 2, and then connected to the discharge pipe 4 extending downward, so that there is no need to bend the discharge pipe 4, which is convenient for connection and ensures the service life of the discharge pipe 4.

[0029] The inner side of the bottom wall 12 is an inclined surface that gradually decreases toward the position of the emptying outlet 3. Of course, in order to save materials and facilitate heat conduction, the side walls 11 and the bottom wall 12 of the kiln body 1 are thin-walled parts, and the outer side of the bottom wall 12 is also an inclined surface that follows the shape of the inner side. After each furnace is discharged normally, when emptying, the inclined bottom wall 12 is conducive to the flow of glass liquid so that it can be completely emptied.

[0030] Please see again Figure 2 The emptying outlet 3 is still located in the middle of the bottom wall 12. On the vertical section through the center of the emptying outlet 3, with the center of the emptying outlet 3 as the vertex of the angle, the angle ∠A between the inner side surfaces of the bottom wall 12 on both sides of the angle is 135~180°, and 180° is a flat bottom state.

[0031] The discharge outlet 2 is higher than the emptying outlet 3 or the distance H between the discharge outlet 2 and the lower edge of the side wall 11 is 20 to 100 mm. The amount of glass liquid released during emptying can be conveniently controlled to ensure the yield and yield and avoid waste. The height of the kiln body 1 is greater than 350 mm, and the inner diameter D3 of the kiln body 1 is 300 mm.

[0032] The discharge pipe 4 and the emptying pipe 5 are each formed by sealingly connecting several pipe sections with decreasing diameters downward. Two sections are shown in the figure, each with a total length of 300 to 2000 mm. The inner diameter φD1 and φD2 of the uppermost pipe section are preferably 10 to 50 mm. The connection between the pipe sections and the connection between the uppermost pipe section and the kiln body 1 can be rounded or beveled to improve the strength of the connection structure.

[0033] Comparison: See also Figure 2 , take the case where the height H of the discharge outlet 2 is 50mm and the liquid level H4 of the glass liquid in the kiln body 1 of each furnace is 300mm as an example. For glass materials that are easy to crystallize, there is a 10mm glass liquid precipitation and crystallization layer at the bottom of the kiln body 1 in each furnace. The height H of the discharge outlet 2 is much greater than 10mm. When each furnace is discharged normally, the clean glass liquid with a relatively high liquid level is discharged from the discharge outlet 2 and the discharge pipe 4 to ensure the quality of the glass liquid; after the normal discharge of each furnace, the glass liquid containing impurities and crystallization at the bottom of 50mm is discharged through the emptying outlet 3 and the emptying pipe 5 for emptying. There is no need for the existing furnace washing operation, and the yield of good products is about (H4-H) / H4 =83.33%, which is much higher than the yield of good products of 43.75% in the traditional method (recorded in the background technology).

[0034] Embodiment 3 The molten glass filtration and unloading test furnace of Example 3 is different from that of Example 2 in the position of the emptying outlet 3. Figure 3 In the third embodiment, the emptying outlet 3 is spaced apart from the middle position of the bottom wall 12. On the vertical section through the center of the emptying outlet 3, between the emptying outlet 3 and the adjacent side wall 11, the angle ∠C between the inner side surface of the bottom wall 12 and the vertical line is 0 to 90°, 90° is a flat bottom state, and 0° is a state adjacent to the side wall 11. It is preferably located on the opposite side of the discharge outlet 2, between the emptying outlet 3 and the farther side wall 11, the angle ∠B between the inner side surface of the bottom wall 12 and the vertical line is 45 to 90°, and 90° is a flat bottom state.

[0035] Embodiment 4 The molten glass filtration and unloading test furnace of the fourth embodiment is different from that of the second embodiment in the connection form and position of the unloading pipe 4. Figure 4 In the fourth embodiment, the emptying outlet 3 is opened at the middle position of the bottom wall 12 of the kiln body 1, and the inner side surface of the bottom wall 12 is an inclined surface which gradually descends toward the position of the emptying outlet 3; the discharge outlet 2 is opened at the edge position of the bottom wall 12 so that it is higher than the emptying outlet 3, and the upper end of the discharge pipe 4 is sealed and connected to the bottom wall 12 and communicated with the discharge outlet 2.

[0036] In this way, the vertical height difference between the discharge outlet 2 and the emptying outlet 3 is naturally formed by utilizing the slope of the bottom wall 12, which is another specific arrangement form in which the upper end of the discharge pipe 4 is connected to the bottom wall 12 of the kiln body 1. Of course, if the slope is small and the vertical height difference is insufficient, the upper end of the discharge pipe 4 can still be sealed and passed upward from the edge of the bottom wall 12 to extend into the inner cavity of the kiln body 1 (such as Figure 4 The discharge outlet 2 is formed by the upper end portion of the discharge pipe 4 (as shown by the dotted line on the discharge outlet 2).

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A molten glass filtering and unloading test furnace, comprising a furnace body, characterized in that: The lower part of the kiln body is provided with a discharge outlet and an emptying outlet, the discharge outlet is connected to a discharge pipe, and the emptying outlet is connected to an emptying pipe; there is a height difference between the discharge outlet and the emptying outlet in the vertical direction and the discharge outlet is higher than the emptying outlet.

2. A molten glass filtering and unloading test furnace according to claim 1, characterized in that: The kiln body comprises a circle of side walls and a bottom wall sealedly connected to the bottom end of the circle of side walls; The upper end of the discharge pipe is connected to the inner cavity of the kiln body through the discharge outlet, and the lower end of the discharge pipe extends downward to form a discharge port; the emptying outlet is opened on the bottom wall, the upper end of the emptying pipe extends into the kiln body through the emptying outlet, and the lower end of the emptying pipe extends downward to form an emptying outlet.

3. The molten glass filtering and unloading test furnace according to claim 1, characterized in that: The kiln body comprises a circle of side walls and a bottom wall sealedly connected to the bottom end of the circle of side walls; The emptying outlet is opened on the bottom wall, the upper end of the emptying pipe is connected with the emptying outlet, the upper end of the emptying pipe is not higher than the upper edge of the emptying outlet, and the lower end of the emptying pipe extends downward to form an emptying outlet.

4. A molten glass filtering and unloading test furnace according to claim 3, characterized in that: The upper end of the discharge pipe is sealed and passes through the bottom wall, the discharge outlet is formed by the upper end portion of the discharge pipe, and the lower end of the discharge pipe extends downward to form a discharge port.

5. A molten glass filtering and unloading test furnace according to claim 3, characterized in that: The discharge outlet is provided at the lower part of the side wall of the kiln body, the upper end of the discharge pipe is sealedly connected to the side wall and communicated with the discharge outlet, and the lower end of the discharge pipe extends downward to form a discharge port.

6. A molten glass filtering and unloading test furnace according to claim 5, characterized in that: The discharge outlet is externally connected to a 90° elbow and is connected to a discharge pipeline extending downward.

7. A molten glass filtration and unloading test furnace according to any one of claims 3 to 6, characterized in that: The inner side surface of the bottom wall is an inclined surface which gradually decreases toward the position of the emptying outlet.

8. A molten glass filtering and unloading test furnace according to claim 7, characterized in that: The emptying outlet is located in the middle of the bottom wall. On a vertical section through the center of the emptying outlet, with the center of the emptying outlet as the vertex of the angle, the angle between the inner side surfaces of the bottom wall on both sides of the angle is 135-180°.

9. A molten glass filtering and unloading test furnace according to claim 7, characterized in that: The emptying outlet is spaced apart from the middle position of the bottom wall. On a vertical section through the center of the emptying outlet, between the emptying outlet and the adjacent side wall, the angle between the inner side surface of the bottom wall and the vertical line is 0 to 90°, and between the emptying outlet and the farther side wall, the angle between the inner side surface of the bottom wall and the vertical line is 45 to 90°.

10. A molten glass filtering and unloading test furnace according to claim 1, characterized in that: The kiln body comprises a circle of side walls and a bottom wall sealedly connected to the bottom end of the circle of side walls; The emptying outlet is opened at the middle position of the bottom wall, and the inner side surface of the bottom wall is an inclined surface that gradually decreases toward the position of the emptying outlet; the upper end of the emptying pipe is connected to the emptying outlet, the upper end of the emptying pipe is not higher than the upper edge of the emptying outlet, and the lower end of the emptying pipe extends downward to form an emptying outlet; The discharge outlet is opened at the edge of the bottom wall so as to be higher than the emptying outlet. The upper end of the discharge pipe is sealed and connected to the bottom wall and communicates with the discharge outlet. The lower end of the discharge pipe extends downward to form a discharge port.

11. A molten glass filtering and unloading test furnace according to claim 1, characterized in that: The discharge outlet is 20 to 100 mm higher than the emptying outlet.

12. A molten glass filtering and unloading test furnace according to claim 11, characterized in that: The height of the kiln body is greater than 350-450 mm, and the inner diameter of the kiln body is 250-350 mm.

13. A molten glass filtering and unloading test furnace according to claim 1, characterized in that: The discharge pipe and / or the emptying pipe is formed by sealingly connecting a plurality of pipe sections with decreasing diameters downwards, with a total length of 300 to 2000 mm, and the inner diameter of the uppermost pipe section is 10 to 50 mm.

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