Automatic purification device for high-temperature dust in hearth and working method of automatic purification device

Abstract

The invention discloses an automatic purification device for high-temperature dust in a hearth and a working method of the automatic purification device, and belongs to the technical field of plate glass manufacturing. The device comprises a forming furnace, an annealing furnace, an automatic detection system and a purification and dust collection system, the furnace is positioned below the forming furnace; a plurality of first dust suction pipes are mounted in hearths of the forming furnace and the annealing furnace; the first dust suction pipe is connected with the purification and dust collection system through a connecting piece; the purification and dust collection system is connected and used for collecting hot air in the forming furnace and the annealing furnace and conveying the hot air subjected to filtering and dust removal into hearths of the forming furnace and the annealing furnace again through an air supply pipe; the automatic detection system is connected with the forming furnace or the annealing furnace and used for detecting the dust concentration in a hearth of the forming furnace or the annealing furnace and feeding the dust concentration back to the purification and dust collection system through the PLC control system. According to the invention, the concentration of tiny dust in the hearth can be detected on line, and the tiny dust in the hearth can be purified, so that the thermal adhesion defect of the glass surface is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of flat glass manufacturing, and relates to an automatic purification device for high-temperature dust in a furnace and a working method thereof. Background Art

[0002] The overflow down-draw method is one of the main methods for manufacturing liquid crystal substrate glass. This method is to send molten glass with appropriate viscosity into the overflow trough (internal component of the muffle furnace). Since there are platinum baffle devices slightly higher than the overflow trough at both ends of the overflow trough, when the overflow trough is full, the glass liquid overflows along the two sides of the overflow trough and flows to the inclined wall surface. Under the guidance of the drainage plate, the two streams of glass liquid merge into one. Through the clamping of the shaping equipment and the pulling of the traction equipment, a single glass plate is finally formed, and then cooled in a certain temperature gradient in the annealing furnace to eliminate thermal stress and structural non-uniformity in the glass plate. The outstanding advantage of this method is that the surface of the glass plate does not contact any macroscopic material, so it has good flatness and smoothness, and can be exempted from subsequent processing such as grinding or polishing.

[0003] As the market's requirements for the clarity, color saturation and other performance of new display devices become higher and higher, panel factories have also become more stringent in their requirements for substrate glass surface defects, which puts higher requirements on the process environment of substrate glass. In order to achieve this goal, it is necessary to control the entire process of substrate glass production and manufacturing. Considering the equipment structure and regional temperature of the forming furnace and annealing furnace, the furnace must ensure a high degree of cleanliness to ensure the surface cleanliness of the substrate glass. However, in the actual production of substrate glass, glass plate breakage, equipment maintenance, and component replacement are inevitable. At this time, the forming furnace and annealing furnace will inevitably be polluted by dust such as glass slag and glass powder, which seriously affects the cleanliness of the furnace. Under the action of the high-temperature airflow in the furnace, these dusts are very easy to float and suspend, adhere to the surface of the pulled-down glass plate, and finally form thermal adhesion defects (Adhered Glass, ADG). In addition, due to the strong adhesion of ADG generated at high temperature, it is difficult to clean it thoroughly in subsequent processing, and there is also a large risk of scratches, which seriously affects the quality of the substrate glass.

[0004] Based on the above situation, in actual production, it is usually necessary to stop the machine for maintenance to centrally clean the broken glass in the furnace, and then use the blowpipe to blow the furnace. This method is more effective for cleaning larger glass slag in the furnace, but the cleaning effect on smaller glass powder is obviously insufficient. On the one hand, the suspended glass powder in the furnace is difficult to settle quickly, and on the other hand, blowing will cause the glass powder that has already settled to float again, causing secondary dust pollution in the furnace. In addition, due to the large difference between the temperature of the gas blown in and the temperature in the furnace, a large amount of or long-term blowing will inevitably cause the temperature in the furnace to change, affecting the draw-down forming state of the glass sheet.

[0005] In summary, it is difficult to effectively clean tiny dust particles in the furnace with the existing technology, and it is difficult to fundamentally improve the thermal adhesion defects on the glass surface. Summary of the invention

[0006] The purpose of the present invention is to provide an automatic purification device for high-temperature dust in a furnace and a working method thereof, so as to solve the technical problem that the fine dust in the furnace is difficult to clean in the prior art glass production, thus affecting the quality of glass production.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present invention provides an automatic purification device for high-temperature dust in a furnace, comprising a molding furnace, an annealing furnace, an automatic detection system and a purification dust collection system; the annealing furnace is located below the molding furnace; a plurality of first dust suction pipes are installed in the furnaces of the molding furnace and the annealing furnace; the first dust suction pipes are connected to the purification dust collection system through a connecting piece; the purification dust collection system is connected to collect hot air in the molding furnace and the annealing furnace, and after filtering and dust removal, it is transported to the furnace of the molding furnace and the annealing furnace through an air supply pipe; the automatic detection system is connected to the molding furnace or the annealing furnace, and the automatic detection system is used to detect the dust concentration in the furnace of the molding furnace or the annealing furnace, and feed back to the purification dust collection system through a PLC control system.

[0008] Furthermore, the purification and dust collection system includes a second dust suction pipe, a dust collection fan and a circulation fan which are connected in sequence; the second dust suction pipe is connected to the first dust suction pipe through a connecting piece; and the dust collection fan is connected to a PLC control system.

[0009] Furthermore, a water cooling jacket is provided on the outer wall of the second dust suction pipe.

[0010] Furthermore, the automatic detection system comprises a detection tube, a duct fan and a dust concentration detector which are connected in sequence; the detection tube is connected to a forming furnace or an annealing furnace; and a water cooling coil is wound around the outer wall of the detection tube.

[0011] Furthermore, the detection tube and the first dust suction tube are both made of high temperature resistant metal or alloy material.

[0012] Furthermore, a ball valve is installed at one end of the detection tube close to the forming furnace or the annealing furnace.

[0013] Furthermore, a plurality of filter holes are provided on the side wall of the first dust suction pipe; one end of the first dust suction pipe is closed and the other end is open; and the open end of the first dust suction pipe is connected to the connecting piece.

[0014] Furthermore, the open end of the first dust suction pipe is connected to the connecting piece through a sealing joint.

[0015] Furthermore, the connecting piece is a hose.

[0016] In a second aspect, the present invention provides the above-mentioned automatic purification device for high-temperature dust in the furnace, comprising the following steps: The dust concentration in the furnace of the forming furnace or annealing furnace is detected by the automatic detection system. When the dust concentration is greater than the preset value, it is fed back to the PLC control system; the PLC control system controls the start-up of the purification and dust collection system to absorb the hot air in the forming furnace and annealing furnace, and return the filtered and dust-removed hot air to the furnace.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses an automatic purification device for high-temperature dust in a furnace and a working method thereof. The dust concentration in the furnace of a forming furnace or an annealing furnace is detected by an automatic detection system. When the dust concentration in the furnace is greater than a certain value, the data is automatically fed back to the PLC control system to start the purification and dust collection system, and then the hot air in the furnace is adsorbed through a first dust suction pipe, and the dust in the hot air is filtered and sent back to the furnace to maintain the pressure balance and temperature stability in the furnace. On the one hand, the present invention can realize the online detection of the dust concentration in the furnace, and on the other hand, when an abnormal situation occurs during production, the dust concentration in the furnace can be quickly reduced to reduce the pollution in the furnace, thereby reducing the thermal adhesion defects on the surface of the glass plate.

[0018] Furthermore, the purification and dust collection system of the present invention includes a second dust suction pipe, a water cooling jacket, a dust collecting fan and a circulating fan; when the dust concentration in the furnace is greater than a certain value, the dust collecting fan and the circulating fan are started, and the dust collecting fan transmits the negative pressure to the second dust suction pipe, the hose, and the first dust suction pipe in turn, and then begins to absorb the dust in the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an automatic detection system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the position distribution of the first dust suction pipe according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the first dust suction pipe according to an embodiment of the present invention.

[0021] Among them: 1-forming furnace; 2-annealing furnace; 3-furnace door; 4-glass plate; 5-first dust suction pipe; 6-automatic detection system; 7-hose; 8-second dust suction pipe; 9-water cooling jacket; 10-PLC control system; 11-dust collecting fan; 12-circulating fan; 13-air supply pipe; 14-detection tube; 15-ball valve; 16-water cooling coil; 17-duct fan; 18-dust concentration detector; 19-filter hole; 20-sealing joint. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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 part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 1 The embodiment of the present invention discloses an automatic purification device for high-temperature dust in a furnace, characterized in that it includes a molding furnace 1, an annealing furnace 2, an automatic detection system 6 and a purification dust collection system; the annealing furnace 2 is located below the molding furnace 1; a plurality of first dust suction pipes 5 are installed in the furnaces of the molding furnace 1 and the annealing furnace 2; the first dust suction pipes 5 are connected to the purification dust collection system through a connecting piece; the purification dust collection system is connected to collect hot air in the molding furnace 1 and the annealing furnace 2, and after filtering and dust removal, it is transported to the furnaces of the molding furnace 1 and the annealing furnace 2 through an air supply pipe 13, and the air supply pipe 13 is made of metal or alloy material; the automatic detection system 6 is connected to the molding furnace 1 or the annealing furnace 2, and the automatic detection system 6 is used to detect the dust concentration in the furnace of the molding furnace 1 or the annealing furnace 2, and feed it back to the purification dust collection system through the PLC control system 10.

[0029] In a feasible embodiment of the present invention, the purification dust collection system includes a second dust suction pipe 8, a dust collection fan 11 and a circulating fan 12 connected in sequence; the second dust suction pipe 8 is connected to the first dust suction pipe 5 through a connector; the dust collection fan 11 is connected to the PLC control system 10. A water cooling jacket 9 is provided on the outer wall of the second dust suction pipe 8. The water cooling jacket 9 is made of a metal or alloy material with good ductility and has good water tightness. The dust (or gas) temperature in the furnace can be reduced (<200°C) by circulating water cooling to ensure the normal operation of the dust collection fan 11.

[0030] In a possible embodiment of the present invention, see Figure 2The automatic detection system 6 includes a detection tube 14, a duct fan 17 and a dust concentration detector 18 connected in sequence; the duct fan 17 is arranged inside the detection tube 14, and can suck the gas in the furnace to the detection tube 14 for detection. The detection tube 14 is connected to the forming furnace 1 or the annealing furnace 2; the outer wall of the detection tube 14 is wrapped with a water-cooling coil 16, and the water-cooling coil 16 is made of a metal or alloy material with good ductility and good water tightness. After the water-cooling coil 16 passes through the circulating water, the temperature of the dust (or gas) in the furnace can be greatly reduced (<60°C) to meet the applicable temperature requirements of the dust concentration detector. A ball valve 15 is installed at one end of the detection tube 14 close to the forming furnace 1 or the annealing furnace 2, and the connectivity between the detection tube 14 and the inside of the furnace can be controlled by opening and closing the valve. The detection tube 14 and the first dust suction pipe 5 are both made of high temperature resistant (>1000°C) metal or alloy materials. In this embodiment, the dust concentration detector 18 uses the laser scattering principle to detect the concentration of particulate matter in the detection tube 14. When the dust in the air passes through the laser beam, the scattered laser signal is received by the detector. When the measured dust concentration in the furnace is greater than a certain value, it can automatically feed back to the PLC control system 10 to start the dust collecting fan 11 and the circulating fan 12, thereby achieving adsorption and purification of the dust in the furnace. Its adsorption capacity can be controlled by adjusting the frequency of the dust collecting fan 11.

[0031] In a possible embodiment of the present invention, see Figure 4 The side wall of the first dust suction pipe 5 is provided with a plurality of filter holes 19; one end of the first dust suction pipe 5 is closed and the other end is open; the open end of the first dust suction pipe 5 is connected to the connector via a sealing joint 20. The connector is preferably a hose 7. Preferably, two first dust suction pipes 5 are grouped together and are respectively installed in the lower part of the furnace of the forming furnace 1 or the annealing furnace 2 and on the left and right sides of the glass plate 4. The outer ends of all the pipes are preset with sealing joints 20, which are located on the left and right sides of the furnace door 3. Figure 3 As shown. The first dust suction pipe 5 is made of high temperature resistant (>1000°C) metal or alloy material. The aperture and distribution density of the plurality of filter holes 19 on the surface of the pipe body can be determined according to the size of the dust particles in the furnace. The hose 7 is a "Y"-shaped pipe structure. The hose 7 is made of high temperature resistant (>1000°C) metal material, such as a steel wire braided hose. For safety and convenience, the hose can be coated with heat insulating materials, such as alumina insulation felt.

[0032] The embodiment of the present invention discloses an automatic purification device for high-temperature dust in a furnace, comprising the following steps: The dust concentration in the furnace of the forming furnace 1 or the annealing furnace 2 is detected by the automatic detection system 6. When the dust concentration is greater than the preset value, it is fed back to the PLC control system 10; the PLC control system 10 controls the start-up of the purification and dust collection system to absorb the hot air in the forming furnace 1 and the annealing furnace 2, and send it back to the furnace after filtering and dust removal.

[0033] The working process of the present invention is as follows: In actual production, if the production line runs continuously and stably, the ball valve 15 and the duct fan 17 of the automatic detection system can be set to the normally open mode to enable online monitoring and management of the dust concentration in the furnace.

[0034] If the production line encounters abnormal situations such as glass plate 4 breakage, equipment maintenance, and component replacement, the forming furnace and annealing furnace will inevitably produce a large amount of dust pollution such as glass slag and glass powder, which will affect the cleanliness of the furnace and easily form thermal adhesion defects on the surface of the glass plate 4. At this time, the operator can observe and compare the dust pollution of each furnace in advance, and give priority to vacuuming and purifying the furnace with more serious pollution. Connect the first dust suction pipe sealing joint 20 of the furnace to the hose 7. Then open the ball valve 15, and then turn on the pipeline fan 17 to suck the hot gas in the furnace to the detection tube 14, and then close the ball valve 15. Under the action of the internal circulating cooling water of the water-cooled coil, the temperature of the hot gas in the detection tube 14 is greatly reduced (<60°C), meeting the applicable requirements of the dust concentration detector 18, and finally detecting the dust concentration. When the dust concentration in the furnace is greater than a certain value, the data will be automatically fed back to the PLC control system 10 to start the dust collection fan 11 and the circulation fan 12. The dust collecting fan 11 transmits the negative pressure to the second dust collecting pipe 8, the hose 7, and the first dust collecting pipe 5 in sequence, and then begins to absorb the furnace dust. The dust enters the first dust collecting pipe 5 through the filter hole 19, and then enters the hose 7 and the second dust collecting pipe 8, and is cooled down (<200°C) by the cooling effect of the water cooling jacket 9, and is finally absorbed by the dust collecting fan 11. The hot air filtered and dust-removed by the dust collecting fan 11 is discharged through the circulating fan 12 and sent back to the furnace to maintain the pressure balance and temperature stability in the furnace. Referring to the above method, the hose 7 is connected to the sealing joint 20 of the first dust collecting pipe 5 of other furnaces contaminated by dust, so as to achieve the adsorption and purification of dust in each furnace.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic purification device for high-temperature dust in a furnace, characterized in that: The invention comprises a molding furnace (1), an annealing furnace (2), an automatic detection system (6) and a purification dust collection system; the annealing furnace (2) is located below the molding furnace (1); a plurality of first dust suction pipes (5) are installed in the furnace chambers of the molding furnace (1) and the annealing furnace (2); the first dust suction pipes (5) are connected to the purification dust collection system through a connecting piece; the purification dust collection system is used to collect hot air in the molding furnace (1) and the annealing furnace (2), and after filtering and removing dust, the hot air is transported to the furnace chambers of the molding furnace (1) and the annealing furnace (2) through an air supply pipe (13); the automatic detection system (6) is connected to the molding furnace (1) or the annealing furnace (2), and the automatic detection system (6) is used to detect the dust concentration in the furnace chamber of the molding furnace (1) or the annealing furnace (2), and to feed back to the purification dust collection system through a PLC control system (10).

2. The automatic purification device for high-temperature dust in a furnace according to claim 1, characterized in that: The purification dust collection system comprises a second dust suction pipe (8), a dust collection fan (11) and a circulation fan (12) which are connected in sequence; the second dust suction pipe (8) is connected to the first dust suction pipe (5) via a connecting piece; and the dust collection fan (11) is connected to a PLC control system (10).

3. The automatic purification device for high-temperature dust in a furnace according to claim 2, characterized in that: The outer wall of the second dust suction pipe (8) is provided with a water cooling jacket (9).

4. The automatic purification device for high-temperature dust in a furnace according to claim 1, characterized in that: The automatic detection system (6) comprises a detection tube (14), a duct fan (17) and a dust concentration detector (18) which are connected in sequence; the detection tube (14) is connected to a molding furnace (1) or an annealing furnace (2); and a water cooling coil (16) is wound around the outer wall of the detection tube (14).

5. The automatic purification device for high-temperature dust in a furnace according to claim 4, characterized in that: The detection tube (14) and the first dust suction tube (5) are both made of high-temperature resistant metal or alloy material.

6. The automatic purification device for high-temperature dust in a furnace according to claim 4, characterized in that: A ball valve (15) is installed at one end of the detection tube (14) close to the molding furnace (1) or the annealing furnace (2).

7. The automatic purification device for high-temperature dust in a furnace according to claim 1, characterized in that: A plurality of filter holes (19) are provided on the side wall of the first dust suction pipe (5); one end of the first dust suction pipe (5) is closed and the other end is open; the open end of the first dust suction pipe (5) is connected to a connecting piece.

8. The automatic purification device for high-temperature dust in a furnace according to claim 7, characterized in that: The open end of the first dust suction pipe (5) is connected to the connecting piece via a sealing joint (20).

9. The automatic purification device for high-temperature dust in a furnace according to claim 1, characterized in that: The connecting piece is a hose (7).

10. An automatic purification device for high-temperature dust in a furnace according to any one of claims 1 to 9, characterized in that: The following steps are involved: The dust concentration in the furnace of the molding furnace (1) or the annealing furnace (2) is detected by an automatic detection system (6). When the dust concentration is greater than a preset value, the dust concentration is fed back to a PLC control system (10). The PLC control system (10) controls the start-up of the purification and dust collection system to absorb the hot air in the molding furnace (1) and the annealing furnace (2), and returns the filtered and dust-removed hot air to the furnace.

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