Cooling device for glass kiln tank wall

Abstract

The utility model relates to the technical field of glass production equipment, in particular to a cooling device for a glass kiln pool wall, which comprises an air supply pipe and a cooling air bellow, the section of the cooling air bellow in the vertical direction is a right trapezoid, and the cooling air bellow is divided into three sections from top to bottom, namely an upper air bellow, a middle air bellow and a lower air bellow; the air supply pipe is respectively communicated with the upper air bellow, the middle air bellow and the lower air bellow to supply air; the cooling air bellows are provided with air blowing holes facing the outer vertical surface of the pool wall, and the cooling air bellows sequentially correspond to the glass liquid level line of the pool wall to the bottom edge of the pool wall from top to bottom. The utility model has the beneficial effects that aiming at the prominent technical characteristics that the iron content of the glass liquid in the existing flat glass melting furnace is lower and lower and the temperature gradient of the glass liquid is lower and lower, the strategy that the cooling air bellow is large at the upper part and small at the lower part and the cooling intensity is reduced in a gradient manner from top to bottom is adopted for carrying out organic seamless connection of the cooling intensity.

Description

Technical Field

[0001] The utility model relates to the technical field of glass production equipment, in particular to a cooling device for a glass kiln pool wall. Background Art

[0002] To reduce the erosion and scouring of the glass furnace pool wall by the high-temperature molten glass, cooling air is generally applied along the pool wall, aligned with the liquid level of the glass on the inner side of the pool wall, to cool down the pool wall and reduce the erosion and scouring of the pool wall bricks by the high-temperature molten liquid. For example, modern flat glass furnaces are gradually developing in the direction of large-scale, low-iron, ultra-white glass. Whether it is ultra-white float glass or ultra-white rolled photovoltaic glass, due to the low iron content in ultra-white glass, the temperature gradient in the vertical direction of the glass liquid in the melting furnace is getting smaller and smaller, and the temperature of the glass liquid reaching the bottom of the pool is getting higher and higher. Therefore, in the use of modern large-scale flat glass furnaces, the erosion and scouring of the pool wall bricks by the high-temperature molten glass is becoming more and more serious. Many domestic flat glass companies have frequently experienced glass water leakage due to the production of ultra-white glass. First, the lining bricks of some ultra-clear photovoltaic and float glass furnaces, where low-iron ultra-clear glass is produced, have been eroded and perforated over time, leading to leaks of glass water during production. While these problems can be repaired if discovered promptly, they can easily lead to serious accidents if discovered late. Second, the cracks in the lining bricks of low-iron glass furnaces are more susceptible to the aforementioned dangerous accidents.

[0003] In the existing technology, the pool wall cooling method of the glass furnace is to cool the glass liquid level with a flat nozzle. The air volume is controlled by a manual air valve to blow air to the pool wall bricks at the liquid level to cool down the temperature and reduce erosion and scouring. The above method is simple, convenient and easy to operate. However, the disadvantage is that it is an old technology, old method and old thinking that was adopted 100 years ago when the iron content in the glass liquid was about 0.25% and the temperature gradient in the depth direction of the melting furnace was large. It is no longer suitable for modern ultra-large flat glass furnaces or low-iron ultra-white glass furnaces with an iron content of about 100PPM in the glass liquid and the temperature of the pool bottom rises by more than 100 degrees.

[0004] In the prior art, to address the vulnerability of large ultra-clear glass furnace pool bricks to erosion, perforation, and leaks caused by high-temperature molten glass, most manufacturers install 8-inch air ducts in the pool brick seams or casting holes. This method is simple to manufacture, saves materials, and is easy to operate. However, its disadvantages are a small cooling area. While the air volume directly opposite the nozzle is high, and the cooling intensity is sufficiently strong, this can lead to excessive cooling intensity at the nozzle, which can cause glass quality issues such as crystallization, boils, and cold glass. Furthermore, the cooling intensity is insufficient at locations further from the nozzle, which have low airflow, making it difficult to address the severe erosion and scouring issues.

[0005] The utility model discloses a special method, device and application thereof, which adopts gradient cooling for pool wall bricks when the pool bottom temperature rises by more than 100 degrees and is aimed at low-iron ultra-clear photovoltaic glass and ultra-clear float glass with an iron content of about 100 ppm, so as to reduce the erosion and scouring of the pool wall by the high-temperature molten glass liquid. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a gradient cooling device for the pool wall of a glass furnace, which can reduce the temperature by gradient, cool the pool wall uniformly, improve the cooling efficiency and reduce the cooling cost.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: providing a gradient cooling device for the wall of a glass furnace, comprising an air supply duct and a cooling air box;

[0008] The vertical cross-section of the cooling air box is a right-angled trapezoid, and the cooling air box is divided into three sections from top to bottom, namely the upper air box, the middle air box and the lower air box; the air supply duct is connected to the upper air box, the middle air box and the lower air box respectively, and is measured by a temperature sensor, and is controlled by a flow meter, a pressure gauge, a regulating valve and a control cabinet with variable frequency regulation;

[0009] The cooling air bellows are provided with blowing holes toward the outside of the pool wall bricks. The cooling air bellows correspond to the glass liquid level line of the pool wall to the bottom edge of the pool wall from top to bottom. The diameter of the blowing holes on the upper bellows is 10 to 15 mm, the diameter of the blowing holes on the middle bellows is 5 to 10 mm, and the diameter of the blowing holes on the lower bellows is 3 to 8 mm.

[0010] Furthermore, in the cooling device for the above-mentioned glass kiln pool wall, the upper edge of the upper bellows is opposite to the position of the glass liquid level line on the inner side of the pool wall, and a transverse air nozzle is provided on the upper edge of the upper bellows, and the diameter of the transverse air nozzle is 30-50 mm.

[0011] Furthermore, in the above-mentioned cooling and temperature reduction device for the pool wall of the glass kiln, the right-angled side of the right-angled trapezoid of the cooling air blower faces the pool wall.

[0012] Furthermore, in the above-mentioned cooling and temperature-reducing device for the pool wall of the glass kiln, the distance between the cooling air bellows and the pool wall is 5-10 mm.

[0013] Furthermore, in the cooling device for the wall of the glass kiln, the size of the blowing holes is 3-15 mm, and the hole spacing between the blowing holes is 5-30 mm.

[0014] Furthermore, in the cooling and temperature-reducing device for the above-mentioned glass kiln pool wall, the cooling air bellows is made of 3-6 mm steel plate.

[0015] Furthermore, in the above-mentioned cooling device for the pool wall of the glass kiln, a temperature sensor is provided on the outside of the pool wall corresponding to the glass liquid level.

[0016] Furthermore, in the above-mentioned cooling device for the pool wall of the glass kiln, a temperature sensor is provided on the outside of the pool wall corresponding to the wind box.

[0017] Furthermore, in the above-mentioned cooling device for the pool wall of the glass kiln, a temperature sensor is provided on the outer side of the pool wall corresponding to the lower wind box.

[0018] Furthermore, in the cooling device for the pool wall of the glass kiln, the air supply duct is connected to the upper wind box, the middle wind box and the lower wind box respectively through three branch pipes; the three branch pipes are respectively provided with an orifice flow meter, a pressure gauge and a regulating valve.

[0019] The present invention has the beneficial effect of designing a cooling air bellows for the glass furnace pool wall. The bellows are larger at the top and smaller at the bottom. The larger bellows are directed toward the high-temperature liquid level of the upper pool wall tiles, where strong cooling is required. The smaller bellows are directed toward the lower, less-heated areas below the pool wall tiles, where cooling intensity is less intense. This approach addresses the reality of gradient cooling of the pool wall tiles from top to bottom, adopting a strategy of decreasing cooling intensity from top to bottom. This seamlessly connects cooling intensity, ensuring that high cooling intensity is achieved where it is needed and low cooling intensity is achieved where it is needed, thus implementing a seamless gradient cooling method. This eliminates the traditional method of directing air nozzles at a single location or nozzles at a single point for cooling. This avoids the drawback of high cooling intensity (even excessive) in some areas, while insufficient cooling intensity in others. Another feature is that the cooling air volume is controlled by a step-by-step frequency conversion mechanism from front to back at the pool wall liquid level, ensuring that the pool wall temperature is just right, preventing erosion by the glass liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the relevant structure of a cooling device for a glass furnace pool wall according to a specific embodiment of the utility model;

[0021] Description of labels:

[0022] 1. Pool wall; 11. Glass liquid level;

[0023] 2. Air supply duct; 3. Cooling air bellows; 31. Upper bellows; 32. Middle bellows; 33. Lower bellows; 34. Orifice flowmeter; 35. Pressure gauge; 36. Control valve;

[0024] 4. Air blowing hole; 5. Horizontal air nozzle. DETAILED DESCRIPTION

[0025] In order to explain the technical content, objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

[0026] See also Figure 1 The utility model provides a cooling device for a glass furnace pool wall 1, comprising an air supply duct 2 and a cooling air box 3;

[0027] The vertical cross-section of the cooling air box 3 is a right-angled trapezoid, and the cooling air box 3 is divided into three sections from top to bottom, namely an upper air box 31, a middle air box 32, and a lower air box 33; the air supply duct 2 is connected to the upper air box 31, the middle air box 32, and the lower air box 33 respectively;

[0028] The cooling air blower 3 is provided with blowing holes 4 toward the pool wall 1, and the cooling air blower 3 corresponds to the glass liquid level 11 of the pool wall 1 to the bottom edge of the pool wall 1 from top to bottom;

[0029] The diameter of the blowing holes 4 on the upper bellows 31 is 10-15 mm, the diameter of the blowing holes 4 on the middle bellows 32 is 5-10 mm, and the diameter of the blowing holes 4 on the lower bellows 33 is 3-8 mm.

[0030] As can be seen from the above description, the beneficial effects of the present invention are as follows: the cooling air bellows 3 of the cooling and cooling device of the glass kiln pool wall 1 of the present invention is large at the top and small at the bottom. The large end is aimed at the location of the high temperature liquid level of the upper pool wall 1 brick where strong cooling is required, and the lower end is aimed at the location below the pool wall 1 brick where the temperature is not very high and a slightly lower cooling intensity is required. In this way, in view of the actual situation of the pool wall 1 brick being cooled from top to bottom in a gradient, a strategy of gradually reducing the cooling intensity from top to bottom is adopted, and the cooling intensity is organically and seamlessly connected, so that the cooling intensity is large where the cooling intensity should be large, and the cooling intensity is small where the cooling intensity should be small, and a seamless gradient cooling method is implemented. The old method of blowing air at a location for cooling is no longer used; the pipe mouth is blown at a point for cooling. The disadvantages of high cooling intensity or even excessive cooling in some places and too low cooling intensity in some places are avoided.

[0031] Furthermore, in the cooling device of the above-mentioned glass kiln pool wall 1, the upper edge of the upper wind box 31 is opposite to the position of the glass liquid level line 11 on the inner side of the pool wall 1, and a horizontal air nozzle 5 is set on the upper edge of the upper wind box 31. The diameter of the horizontal air nozzle 5 is 30-50 mm.

[0032] As can be seen from the above description, the transverse air nozzles 5 are provided to enhance the cooling intensity of the pool wall 1 at the liquid level position.

[0033] Furthermore, in the cooling device for the glass furnace pool wall 1 , the right-angled side of the right-angled trapezoid of the cooling air blower 3 faces the pool wall 1 .

[0034] From the above description, it can be seen that when the right-angled trapezoid shape is evenly close to the pool wall 1, the cooling intensity is high where the cooling intensity should be high, and the cooling intensity is low where the cooling intensity should be low.

[0035] Furthermore, in the cooling and temperature-reducing device for the glass furnace pool wall 1, the distance between the cooling air box 3 and the pool wall 1 is 5-10 mm.

[0036] From the above description, it can be seen that the above 5-10 mm is the optimal distance and has the best cooling effect.

[0037] Furthermore, in the cooling and temperature-reducing device of the above-mentioned glass kiln pool wall 1, the diameter of the blowing holes 4 is that the upper bellows aperture is larger and the lower bellows aperture is smaller, generally 3-15mm, and the spacing between the blowing holes 4 is 5-30mm, that is, the upper bellows aperture is large and the spacing between holes is small, so naturally the blowing is more and larger, and the cooling intensity is also greater; while the lower bellows aperture is small and the hole spacing is large, the blowing volume is small and the cooling intensity is also small.

[0038] At the upper liquid level position on the outside of the pool wall tiles from front to back, the air volume is controlled by frequency conversion as the temperature of the molten glass changes, so that the molten glass cannot corrode the moving pool wall tiles.

[0039] On the outside of the pool wall, from top to bottom, as the glass liquid temperature and the pool wall drop in gradient, the cooling bellows also creatively implements gradient frequency conversion control to cool the air, preventing the pool wall from being eroded and leaking glass water.

[0040] From the above description, it can be seen that the size and spacing of the blowing holes 4 are set to achieve the best cooling effect.

[0041] Furthermore, in the cooling device of the glass furnace pool wall 1, the cooling air box 3 is made of 3-6 mm steel plate.

[0042] It can be seen from the above description that the steel plates of the above thickness can save costs while being sufficient.

[0043] Furthermore, in the cooling device for the pool wall 1 of the glass furnace, a temperature sensor is provided on the outer side of the pool wall 1 corresponding to the glass liquid level 11 .

[0044] As can be seen from the above description, a temperature sensor is installed on the outside of the pool wall 1 brick corresponding to the glass liquid level line 11. Based on the temperature detected by the temperature sensor, if the temperature is insufficient to prevent erosion of the glass liquid level, the regulating valve will activate to increase the air volume of the branch pipe; if the temperature is too low, which may cause energy waste, the regulating valve will activate to reduce the air volume. Both can achieve variable frequency regulation control based on the detected pool wall temperature.

[0045] Furthermore, in the cooling device for the glass furnace pool wall 1 , a temperature sensor is provided on the outer side of the pool wall 1 corresponding to the wind box 32 .

[0046] From the above description, it can be seen that a temperature sensor is also installed on the pool wall 1 corresponding to the position of the middle wind box 32. If the temperature on the outside of the above-mentioned pool wall 1 is too high and is not enough to prevent the erosion of the middle glass liquid and the generation of refractory bubbles, the air valve of the air duct on the bellows corresponding to the above-mentioned pool wall 1 is started to increase the air volume, increase the cooling intensity, and prevent the glass liquid from corroding the pool wall 1.

[0047] Furthermore, in the above-mentioned cooling device for the pool wall 1 of the glass kiln, a temperature sensor is provided on the outer side of the pool wall 1 corresponding to the lower wind box 33 .

[0048] As can be seen from the above description, the lower the pool wall 1 bricks are, the lower the glass melt temperature becomes, and the less erosion and scouring of the pool wall 1 occurs. Therefore, the small bellows at the bottom can be designed to be small, and the wind pressure is also reduced. Similarly, a temperature sensor is also installed in the middle of the pool wall 1 corresponding to the small bellows. When the temperature detected by the temperature sensor is not high enough to prevent erosion and scouring of the glass melt, and bubbles in the refractory material are generated, the damper activates to increase the cooling air volume. When the detected temperature of the lower section of the pool wall 1 is low, indicating excessive cooling resulting in energy waste or localized overcooling, the damper activates to reduce the air volume.

[0049] Furthermore, in the cooling device of the glass kiln pool wall 1, the air supply duct 2 is connected to the upper wind box 31, the middle wind box 32 and the lower wind box 33 through three branch pipes; the three branch pipes are respectively provided with an orifice flow meter 34, a pressure gauge 35 and a regulating valve 36.

[0050] Example 1

[0051] The glass melting furnace of this embodiment comprises a pool wall, a pool bottom, a glass liquid surface, a breast wall and a large arch. A cooling device for the glass furnace pool wall is installed outside the pool walls on both sides of the furnace.

[0052] See also Figure 1 The cooling device of the glass furnace pool wall 1 of this embodiment includes an air supply duct 2 and a cooling air box 3;

[0053] The cooling air box 3 has a vertical cross-section of a right-angled trapezoid, and is divided into three sections from top to bottom, namely an upper air box 31, a middle air box 32, and a lower air box 33; the air supply duct 2 is connected to the upper air box 31, the middle air box 32, and the lower air box 33 respectively;

[0054] The cooling air box 3 is provided with a blowing hole 4 toward the pool wall 1 , and the cooling air box 3 corresponds to the glass liquid level 11 of the pool wall 1 to the bottom edge of the pool wall 1 from top to bottom.

[0055] The right angle side of the right-angled trapezoid of the cooling air blower 3 faces the pool wall 1. The distance between the cooling air blower 3 and the pool wall 1 is 5-10 mm.

[0056] The air supply duct 2 is connected to the upper air box 31, the middle air box 32, and the lower air box 33 through three branch pipes. Each branch pipe is equipped with an orifice flowmeter 34, a pressure gauge 35, and a regulating valve 36. The air supply duct 2 is constructed of heat-resistant seamless steel pipe with a diameter of 100-180 mm and a wall thickness of 3-6 mm. The three branch pipes are also constructed of seamless heat-resistant steel pipe with a wall thickness of 3-6 mm. The pressure gauges 35, orifice flowmeters 34, and air valves on each branch pipe are electrically connected to the control cabinet PLC, enabling automatic temperature control via PID control.

[0057] The cooling air bellows 3 is a three-dimensional trapezoidal quadrilateral structure, welded from 3-6mm heat-resistant steel plates, with a height of 1150mm-1600mm and a width of 350-400mm (preferably the same width as one brick of the pool wall). The bellows thickness is 130-200mm at the top and 100-160mm at the bottom. There are two partitions in the bellows that divide the bellows into three bellows structures: upper, middle and lower. Three pressure gauges 35 are respectively installed on the lower bellows 33, the middle bellows 32 and the upper bellows 31. The bellows pressure gauges 35 are electrically connected to the control cabinet PLC.

[0058] On the side of the bellows near the pool wall 1, through holes are left as blowing holes 4. The diameter of the through holes on the upper bellows 31 is 10-15 mm, the diameter of the through holes on the middle bellows 32 is 5-10 mm, and the diameter of the through holes on the lower bellows 33 is 3-8 mm. The diameters of the through holes on the bellows are all larger at the top and smaller at the bottom, denser at the top and sparser at the bottom, in a progressive change. When the temperature of the upper pool wall 1 is high, the air volume is large and the cooling intensity is also high. When the temperature of the lower pool wall 1 gradually decreases to a certain extent, the air volume is small and the cooling intensity is also reduced accordingly.

[0059] Furthermore, temperature sensing sensors are provided at the center position of the pool wall 1 corresponding to the upper air box 31, the middle air box 32 and the lower air box 33 to collect temperature data in a timely manner and transmit it to the PLC. The PLC adjusts the pressure, flow meter and regulating valve 36 on the branch according to the temperature data to ensure a suitable cooling effect on the pool wall 1.

[0060] The diameter of the blowing holes 4 on the upper bellows 31 is 10-15 mm, the diameter of the blowing holes 4 on the middle bellows 32 is 5-10 mm, and the diameter of the blowing holes 4 on the lower bellows 33 is 3-8 mm.

[0061] The upper edge of the upper wind box 31 faces the position of the glass liquid level 11 inside the pool wall 1. A transverse air nozzle 5 is provided on the upper edge of the upper wind box 31. The opening of the transverse air nozzle 5 is 30-50 mm to enhance the cooling intensity of the glass liquid level on the pool wall 1.

[0062] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A cooling device for a glass furnace pool wall, characterized in that: Including air supply duct and cooling air box; The cross-section of the cooling air box in the vertical direction is a right-angled trapezoid, and the cooling air box is divided into three sections from top to bottom, namely, an upper air box, a middle air box, and a lower air box; the air supply duct is connected to the upper air box, the middle air box, and the lower air box respectively; The cooling air blower is provided with blowing holes toward the pool wall, and the cooling air blower corresponds to the glass liquid level line of the pool wall to the bottom edge of the pool wall from top to bottom; The diameter of the blowing holes on the upper bellows is 10-15 mm, the diameter of the blowing holes on the middle bellows is 5-10 mm, and the diameter of the blowing holes on the lower bellows is 3-8 mm.

2. The cooling device for the glass furnace pool wall according to claim 1, characterized in that: The upper edge of the upper bellows is directly opposite to the position of the glass liquid level on the inner side of the pool wall, and a transverse air nozzle is arranged along the upper edge of the upper bellows. The diameter of the transverse air nozzle is 30-50 mm.

3. The cooling device for the glass furnace pool wall according to claim 1, characterized in that: The right-angled side of the right-angled trapezoid of the cooling air box faces the pool wall.

4. The cooling device for the glass furnace pool wall according to claim 1, characterized in that: The distance between the cooling air box and the pool wall is 5-10 mm.

5. The cooling device for the glass furnace pool wall according to claim 1, characterized in that: The size of the blowing holes is 3-15 mm, and the spacing between the blowing holes is 5-30 mm.

6. The cooling device for the glass furnace pool wall according to claim 1, characterized in that: The cooling air box is made of 3-6 mm steel plate.

7. The cooling device for the glass furnace pool wall according to claim 1, characterized in that: A temperature sensor is provided on the outer side of the pool wall corresponding to the glass liquid level line.

8. The cooling device for the glass furnace pool wall according to claim 1, characterized in that: A temperature sensor is provided on the outer side of the pool wall corresponding to the stroke box.

9. The cooling device for the glass furnace pool wall according to claim 1, characterized in that: A temperature sensor is provided on the outer side of the pool wall corresponding to the lower wind box.

10. The cooling device for the glass furnace pool wall according to claim 1, characterized in that: The air supply duct is connected to the upper air box, the middle air box and the lower air box respectively through three branch pipes; the three branch pipes are respectively provided with an orifice flow meter, a pressure gauge, a regulating valve and a control cabinet.

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