Method for removing trace water from sulfur dioxide protective gas of glass annealing lehr

Abstract

A method for removing trace water in sulfur dioxide protective gas of glass annealing furnace, relates to a method for removing trace water in sulfur dioxide, two sets of cooling systems are connected with protective gas passages (20) through pipelines by a single liquefied sulfur dioxide tank, or two liquefied sulfur dioxide tanks are connected with protective gas passages of a set of cooling systems respectively, a water removal box is arranged on each protective gas passage pipeline, an air inlet pipe (27) arranged at one end of the water removal box is connected with the pipeline in the air inlet direction of the protective gas passage, an air outlet pipe (33) arranged at the other end of the water removal box is connected with the pipeline in the hot air cooling pipe (15) direction of the protective gas passage, a water absorption paper (30) for isolating the straight-through of the air inlet pipe and the air outlet pipe is arranged in the box cavity (40) of the water removal box, and the trace water in the sulfur dioxide is left in the water removal box by the water absorption paper; the cooling system is arranged as two sets, and the trace water is reduced by the water absorption paper of the water removal box of the two sets of cooling systems.

Description

Technical Field

[0001] This invention relates to a method for removing trace amounts of water from sulfur dioxide, and more specifically, to a method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace. Background Technology

[0002] As a high-end product in float glass, electronic glass is constantly being developed and applied, and its quality requirements are increasing with the expansion of application fields. Continuous stability of product quality has become the ultimate goal pursued by all electronic glass companies. Achieving this goal requires consistent stability at every step, from raw materials to forming. Sulfur dioxide, as a protective gas used in float glass processing, plays a role in improving the physical, chemical, and mechanical properties of the glass surface and extending the service life of the rollers. Therefore, improving the purity of sulfur dioxide as a protective gas is key to improving these indicators. Increased purity effectively reduces tin adhesion and oxidation, ensuring uniform film layer. Since sulfur dioxide contains trace amounts of water, removing these trace amounts during use becomes a major requirement for improving quality. Combined with... Figure 1 The float glass manufacturing process involves feeding raw materials into a melting furnace (9) with a furnace roof (11) through a feeding port. The raw materials in the melting furnace (9) are melted at high temperature to form molten glass (10). The molten glass (12) flowing above the molten glass (10) flows into the molten tin (7) of the tin bath (6) through the connecting groove (8) and the baffle (14). Under the action of gravity and surface tension, the molten glass (12) on the surface of the molten tin (7) spreads and flattens on the surface of the molten tin, forming a flat and parallel glass strip. Then it is drawn towards the tail of the tin bath (6). Then it is polished, thinned, hardened and cooled. This process passes through the flattening and polishing zone (13), the cold coating zone (16), the thinning zone (18) and the cooling zone in sequence. In zone (19), the glass strip is pulled out of the tin bath (6) and then enters the annealing furnace (2) via roller B (5) onto roller A (3) set on the upper part of the furnace bottom (4). After annealing and cutting, flat glass (1) is obtained. Among them, the flat polishing zone (13), cold coating zone (16), thinning zone (18) and cooling zone (19) are distributed in sequence from the direction of melting furnace (9) to the direction of annealing furnace (2) in the upper part of the tin bath (6). The aforementioned zones are achieved by introducing sulfur dioxide into the upper part of the tin bath (6) through the protective gas passage (20) and hot air cooling pipe (15) and then spraying it out through multiple air nozzles (17). Removing trace amounts of water in sulfur dioxide before the liquefied sulfur dioxide enters the hot air cooling pipe (15) is one of the research and development topics of this unit. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing methods by disclosing a method for removing trace amounts of water from the sulfur dioxide protective gas in glass annealing furnaces. This method involves setting up two cooling systems and using absorbent paper from the water removal boxes of the two cooling systems alternately to reduce the amount of water.

[0004] In order to achieve the objective of this invention, this application discloses the following technical solution:

[0005] A method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace involves a cooling system formed by a hot air cooling pipe and multiple nozzles above the tin bath via a protective gas passage. A single liquefied sulfur dioxide tank is connected to the protective gas passages of two cooling systems via a pipeline, or two liquefied sulfur dioxide tanks are each connected to the protective gas passages of one cooling system. A water removal box is installed on each protective gas passage pipeline. An inlet pipe at one end of the water removal box is connected to the inlet gas pipe of the protective gas passage, and an exhaust pipe at the other end is connected to the hot air cooling pipe of the protective gas passage. Absorbent paper is installed inside the water removal box to isolate the inlet and exhaust pipes, allowing trace amounts of water from the sulfur dioxide to remain in the water removal box. The water removal boxes connecting the two cooling systems are used alternately.

[0006] The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace includes a rectangular dewatering box with an air inlet pipe at the center of one end face and an exhaust pipe at the center of the other end face. A fixed clamping plate, higher at one end and lower at the other, is fixedly connected to the four walls of the dewatering box cavity. The higher end of the fixed clamping plate is fixed to the upper part of the exhaust pipe's hole, and the lower end is fixed to the lower part of the air inlet pipe's hole. An array of mesh holes B is distributed in the middle of the fixed clamping plate. Multiple absorbent papers are placed on the upper part of the fixed clamping plate, and a movable clamping plate holds the absorbent papers between the movable and fixed clamping plates. The movable clamping plate has mesh holes A corresponding to the array of mesh holes B on the fixed clamping plate.

[0007] The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace includes an air inlet pipe with connecting threads at the center of one end face of a rectangular water removal box, and an exhaust pipe with connecting threads at the center of the other end face of the rectangular water removal box.

[0008] The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace involves multiple screws sequentially passing through perforations near the periphery of a movable clamping plate and holes near the periphery of absorbent paper, and then connecting to screw holes A near the periphery of a fixed clamping plate.

[0009] The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace involves setting steps around the inner wall of the upper opening of the dewatering box, placing rubber gaskets on the steps, and fastening a cover plate to the upper part of the rubber gaskets on the steps. Multiple screws are then connected to screw holes B on the steps after passing through the through holes of the cover plate and the light holes of the rubber gaskets in sequence.

[0010] The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace, wherein the absorbent paper is industrial dust-free absorbent paper.

[0011] Based on the above disclosure, the beneficial effects of the present invention are:

[0012] The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace, as described in this invention, transforms the original single cooling system into two cooling systems. A three-way pipe and connecting pipes are then used to connect to the liquefied sulfur dioxide tank. Two additional outlets of the three-way pipe are connected via pipes, and valves and water removal boxes A and B are installed on the two outlet pipes respectively. The hot air cooling pipes and multiple air nozzles of the two cooling systems are then connected via pipes. By periodically using water removal box A or water removal box B, the absorbent paper inside the box adsorbs the trace amounts of water in the liquefied sulfur dioxide, further achieving the removal of trace amounts of water. Due to the removal of trace amounts of water from the liquefied sulfur dioxide, the purity of the sulfur dioxide is improved, effectively reducing tin adhesion and oxidation, and ensuring a uniform film layer. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an existing glass melting furnace;

[0014] Figure 2 This is a schematic diagram of the structure of the present invention;

[0015] Figure 3 This is a schematic diagram of the water removal box structure of the present invention;

[0016] Figure 4 This is a schematic diagram of the three-dimensional assembly structure of the water removal box of the present invention;

[0017] In the diagram: 1. Glass; 2. Annealing furnace; 3. Roller A; 4. Furnace bottom; 5. Roller B; 6. Tin bath; 7. Molten tin; 8. Connecting trough; 9. Melting furnace; 10. Molten glass; 11. Furnace top; 12. Molten glass; 13. Leveling and polishing area; 14. Baffle; 15. Hot air cooling pipe; 16. Cold coating area; 17. Air nozzle; 18. Thinning area; 19. Cooling area; 20. Protective gas passage; 21. Hot air cooling pipe A 22. Hot air cooling pipe B; 23. Water removal box A; 24. Water removal box B; 25. Cover plate; 26. Screw; 27. Air inlet pipe; 28. Fixed clamping plate; 29. ​​Movable clamping plate; 30. Absorbent paper; 31. Mesh A; 32. Mesh B; 33. Exhaust pipe; 34. Through hole; 35. Rubber gasket; 36. Smooth hole; 37. Through hole; 38. Screw hole A; 39. Step; 40. Box cavity; 41. Screw hole B. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the invention's objectives, features, and advantages. It should be understood that the embodiments shown in the drawings are not the sole limitation on the scope of protection of the present invention, but are merely one implementation method for explaining the scope of the technical solution disclosed in the present invention.

[0019] Combined with appendix Figures 2-4 The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace, as described above, involves a cooling system formed by a protective gas passage 20 leading to a hot air cooling pipe 15 at the top of the tin bath 6 and multiple air nozzles 17. A single liquefied sulfur dioxide tank is connected to the protective gas passages 20 of two cooling systems via a pipeline, or two liquefied sulfur dioxide tanks are each connected to the protective gas passages 20 of one cooling system. A water removal box is installed on each protective gas passage 20 pipeline. An inlet pipe 27 at one end of the water removal box is connected to the inlet gas pipe of the protective gas passage 20, and an exhaust pipe 33 at the other end is connected to the hot air cooling pipe 15 of the protective gas passage 20. Absorbent paper 30, which isolates the inlet pipe 27 from the exhaust pipe 33, is installed inside the water removal box cavity 40, allowing trace amounts of water from the sulfur dioxide to remain in the water removal box. The water removal boxes connecting the two cooling systems are used alternately.

[0020] Combined with appendix Figure 2 , 3Alternatively, the water removal box has a rectangular structure. An air inlet pipe 27 with connecting threads is provided at the center of one end face of the rectangular water removal box, and an exhaust pipe 33 with connecting threads is provided at the center of the other end face of the rectangular water removal box. A fixing clamping plate 28 is higher at one end and lower at the other. The fixing clamping plate 28 is fixedly connected to the four walls of the box cavity 40 of the water removal box. The high end of the fixing clamping plate 28 is fixed to the upper part of the pipe hole of the exhaust pipe 33, and the low end of the fixing clamping plate 28 is fixed to the lower part of the pipe hole of the air inlet pipe 27. An array of mesh holes B32 is distributed in the middle of the fixing clamping plate 28. Multiple absorbent papers 30 are placed on the upper part of the fixing clamping plate 28, and the multiple absorbent papers are held in place by the movable clamping plate 29. The absorbent paper 30 is clamped between the movable clamping plate 29 and the fixed clamping plate 28. The movable clamping plate 29 is provided with mesh holes A31 corresponding to the mesh holes B32 of the fixed clamping plate 28 arranged in an array. Multiple screws pass through the through holes 37 near the periphery of the movable clamping plate 29 and the holes near the periphery of the absorbent paper 30 in sequence, and then connect to the screw holes A38 near the periphery of the fixed clamping plate 28. Steps 39 are provided around the inner wall of the upper opening of the water removal box. Rubber washers 35 are placed on the steps 39. The cover plate 25 is fastened to the upper part of the rubber washers 35 on the steps 39. Multiple screws 26 pass through the through holes 34 of the cover plate 25 and the light holes 36 of the rubber washers 35 in sequence, and then connect to the screw holes B41 on the steps 39.

[0021] The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace as described in this invention is implemented in conjunction with the appendix. Figures 2 to 4 The original hot air cooling pipe 15 located above the tin bath 6 was modified into two hot air cooling pipes, A21 and B22, and air nozzles 17 were installed at the lower part of hot air cooling pipes A21 and B22 respectively; according to the attached... Figure 3 and 4 Two identical water removal boxes, A23 and B24, are manufactured, with two fixed clamping plates 28 fixed inside the water removal boxes A23 and B24 by welding; the absorbent paper 30 of this application is industrial dust-free absorbent paper, and before use, corresponding holes are pressed out according to the positions of the through hole 37 of the movable clamping plate 29 and the screw hole A38 of the fixed clamping plate 28.

[0022] Combined with appendix Figures 2 to 4 When using this application, please refer to the appendix. Figure 2Raw materials are fed into the melting furnace 9 through the feeding port. Inside the melting furnace 9, the raw materials are melted at high temperature to form molten glass 10. The molten glass 12 flowing above the molten glass 10 flows into the surface of the molten tin 7 in the tin bath 6 through the connecting groove 8 and the baffle 14. Under the action of gravity and surface tension, the molten glass 12 on the surface of the molten tin 7 spreads and flattens, forming a smooth and parallel glass ribbon. Then it is pulled towards the tail of the tin bath 6. At this time, the liquefied sulfur dioxide tank with the valve opened flows into the water removal box A23 through the protective gas passage 20 "pipeline" to absorb the trace amount of water after filtration. The paper 30 is removed, and then the glass ribbon is spread and polished in the polishing zone 13, cold coating zone 16, thinning zone 18 and cooling zone 19 above the tin bath 6 through the hot air cooling pipe 15 and the air nozzle 17 to achieve polishing, thinning, hardening and cooling. Then the glass ribbon is pulled out of the tin bath 6 and enters the annealing furnace 2 through the roller B5 onto the roller A3 set on the upper part of the furnace bottom 4. After annealing and cutting, flat glass 1 is obtained. If the customer has extremely strict requirements, this application can install an online sulfur dioxide purity detection system on the exhaust pipe 33 of the dewatering box A23 and the dewatering box B24 to monitor and control the purity to achieve a higher level.

[0023] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to the scope of protection of the present invention. These equivalent forms also fall within the scope defined by the appended claims.

[0024] The parts of this invention not described in detail are prior art.

Claims

1. A method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace, comprising a cooling system formed by introducing hot air cooling pipe (15) and multiple air nozzles (17) into the upper part of a tin bath (6) via a protective gas passage (20), characterized in that: A single liquefied sulfur dioxide tank is connected to the protective gas passage (20) of two cooling systems via a pipeline, or two liquefied sulfur dioxide tanks are each connected to the protective gas passage (20) of one cooling system. A water removal box is installed on each protective gas passage (20) pipeline. The inlet pipe (27) of one end of the water removal box is connected to the inlet gas passage (20) pipeline, and the exhaust pipe (33) of the other end of the water removal box is connected to the hot air cooling pipe (15) pipeline of the protective gas passage (20). A water-absorbing paper (30) is installed in the cavity (40) of the water removal box to isolate the inlet pipe (27) and the exhaust pipe (33) from being directly connected. The water-absorbing paper (30) keeps trace amounts of water in the sulfur dioxide in the water removal box. The water removal boxes A (23) and B (24) connected to the two cooling systems are used alternately.

2. The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace according to claim 1, characterized in that: The water removal box has a rectangular structure. An air inlet pipe (27) is provided in the middle of one end face of the rectangular water removal box, and an exhaust pipe (33) is provided in the middle of the other end face of the rectangular water removal box. The fixing clamp plate (28) is higher at one end and lower at the other end. The fixing clamp plate (28) is fixedly connected to the four walls of the box cavity (40) of the water removal box. The high end of the fixing clamp plate (28) is fixed to the upper part of the pipe hole of the exhaust pipe (33), and the low end of the fixing clamp plate (28) is fixed to the air inlet. The lower part of the tube hole of the tube (27) has an array of mesh holes B (32) distributed in the middle part of the fixed clamping plate (28). Multiple absorbent paper (30) is placed on the upper part of the fixed clamping plate (28). The multiple absorbent paper (30) is clamped between the movable clamping plate (29) and the fixed clamping plate (28) by the movable clamping plate (29). The movable clamping plate (29) is provided with mesh holes A (31) corresponding to the array of mesh holes B (32) of the fixed clamping plate (28).

3. The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace according to claim 1 or 2, characterized in that: An air inlet pipe (27) with connecting threads is provided at the middle of one end face of the rectangular water removal box, and an exhaust pipe (33) with connecting threads is provided at the middle of the other end face of the rectangular water removal box.

4. The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace according to claim 1 or 2, characterized in that: Multiple screws are sequentially passed through the perforations (37) near the periphery of the movable clamping plate (29) and the holes near the periphery of the absorbent paper (30), and then connected to the screw holes A (38) near the periphery of the fixed clamping plate (28).

5. The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace according to claim 1, characterized in that: Steps (39) are provided around the inner wall of the upper opening of the water removal box. Rubber washers (35) are placed on the steps (39). The cover plate (25) is fastened to the upper part of the rubber washers (35) on the steps (39). Multiple screws (26) pass through the through holes (34) of the cover plate (25) and the light holes (36) of the rubber washers (35) in sequence and then connect to the screw holes B (41) on the steps (39).

6. The method for removing trace amounts of water from the sulfur dioxide protective gas in a glass annealing furnace according to claim 1, characterized in that: The absorbent paper (30) is an industrial dust-free absorbent paper.

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