Airflow control structure for D area of glass annealing kiln

Abstract

The invention discloses a D-zone airflow control structure of a glass annealing kiln in the technical field of annealing kilns. The D-zone airflow control structure comprises a C zone, a D zone and an R zone which are sequentially arranged in the conveying direction of a glass tape, an upstream end fixed baffle is arranged between the C area and the D area, and a downstream end fixed baffle is arranged between the D area and the R area; a draught fan, an air inlet pipe and a heat absorption air pipe are installed above the R area, one end of the air inlet pipe is communicated with an air outlet of the draught fan, the other end of the air inlet pipe is communicated with the downstream end of the R area, one end of the heat absorption air pipe is communicated with an air inlet of the draught fan, and the other end of the heat absorption air pipe is communicated with the upstream end of the R area. A backflow air pipe is installed above the area D, one end of the backflow air pipe is communicated with the area D, and the other end of the backflow air pipe is communicated with an air inlet of the fan. According to the invention, a secondary backflow mode is adopted, airflow leaked from the R area to the D area flows back to the R area through the backflow air pipe, the airflow in the R area is prevented from flowing to the C area, and the temperature control influence of the airflow in the R area on the C area is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of annealing furnaces, and in particular to an airflow control structure in a D zone of a glass annealing furnace. Background Art

[0002] The annealing lehr is one of the core process equipment in the flat glass production line. Its main function is to continuously cool the glass strip at about 600℃ to about 70℃ and control the stress generated during the cooling process within the allowable range. In recent years, with the development and progress of the domestic glass industry, the automation level of flat glass production lines has become higher and higher. Domestic equipment manufacturers are moving towards the goal of intelligent and digital production lines, and the requirements for fine control of annealing lehrs are also getting higher and higher.

[0003] The annealing kiln process division consists of Zone A (pre-annealing zone), Zone B (annealing zone), Zone C (rapid cooling zone), Zone D (transition zone), Zone R (hot air circulation cooling zone), Zone E (natural cooling zone) and Zone F (forced cooling zone). Among them, Zone D is between Zone C and Zone R, completing the transition from Zone C to Zone R; Zone C adopts indirect cooling by radiant tubes, and the cooling air flows in the air duct without direct contact with the air in the annealing kiln. Zone R adopts hot air circulation cooling, and the air in Zone R is hot air blown out from the air nozzle through the fan circulation. Since the air in Zone R is under positive pressure, the airflow in Zone R will flow to Zone C, which will affect the temperature atmosphere in Zone C and have a serious impact on the temperature control of Zone C. In severe cases, the thermocouple on the plate in Zone C is 20℃-30℃ lower than the thermocouple under the plate, and the temperature cannot be precisely controlled.

[0004] Therefore, how to prevent the air in zone R from flowing to zone C has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, the object of the present invention is to provide an airflow control structure for zone D of a glass annealing furnace to solve the technical problem that the air in zone R of the existing annealing furnace flows to zone C and affects the temperature control of zone C.

[0006] The technical solution adopted by the present invention is: an airflow control structure of the D zone of a glass annealing furnace, comprising: a C zone, a D zone and an R zone arranged in sequence along the conveying direction of the glass ribbon;

[0007] An upstream fixed baffle is installed between the C zone and the D zone, and a downstream fixed baffle is installed between the D zone and the R zone;

[0008] A fan, an air inlet pipe and a heat absorbing air pipe are installed above the R zone, one end of the air inlet pipe is connected to the air outlet of the fan, the other end of the air inlet pipe is connected to the downstream end of the R zone, one end of the heat absorbing air pipe is connected to the air inlet of the fan, and the other end of the heat absorbing air pipe is connected to the upstream end of the R zone;

[0009] A return air duct is installed above the D zone, one end of the return air duct is connected to the D zone, and the other end of the return air duct is connected to the air inlet of the fan.

[0010] Preferably, an airflow guide assembly is installed in the D zone, the airflow guide assembly is installed on the upstream side of the return air duct, and the airflow guide assembly includes a guide fixed baffle and a guide movable curtain, the two guide fixed baffles are spaced apart along the conveying direction of the glass ribbon, the top of the guide fixed baffle is fixedly connected to the D zone, the guide movable curtain is installed between the two guide fixed baffles, and the guide movable curtain is located below the guide fixed baffle and can be raised and lowered.

[0011] Preferably, the bottom end of the guide movable curtain is inclined toward the downstream end of the D zone.

[0012] Preferably, an air collecting hood is installed above the D zone, one end of the return air duct is connected to the top of the air collecting hood, and the other end of the return air duct is connected to the heat absorbing air duct.

[0013] Preferably, an upstream movable curtain is installed between the C zone and the D zone, and a downstream movable curtain is installed between the D zone and the R zone.

[0014] Preferably, the C zone is installed with a pressure gauge C for detecting the internal pressure of the C zone, the D zone is installed with a pressure gauge D for detecting the internal pressure of the D zone, the R zone is installed with a pressure gauge R for detecting the internal pressure of the R zone, the return air duct is installed with a return valve with an adjustable opening, the heat absorption air duct is installed with an air intake valve with an adjustable opening, and the pressure relief pipe at the top of the R zone is installed with a pressure relief valve with an adjustable opening.

[0015] Beneficial effects of the present invention:

[0016] The present invention adopts a secondary reflux method, wherein the air outlet of the fan is connected to the downstream end of the R zone through an air inlet pipe, the air inlet of the fan is connected to the upstream end of the R zone through a heat absorption air duct, the air inlet of the fan is connected to the middle of the D zone through a return air duct, and an upstream fixed baffle is installed between the C zone and the D zone to prevent gas from flowing from the D zone to the C zone, and a downstream fixed baffle is installed between the D zone and the R zone to prevent gas from flowing from the R zone to the D zone; when the positive pressure airflow in the R zone flows to the C zone through the D zone, When the positive pressure airflow passes through the upstream end of zone R, most of it will be directly sucked away by the heat absorbing air duct, and the remaining positive pressure airflow will be blocked in zone R by the fixed baffle at the downstream end. A small part of the positive pressure airflow leaks to zone D through the fixed baffle at the downstream end. The airflow leaking to zone D is blocked in zone D by the fixed baffle at the upstream end. The airflow in zone D is sucked into the return air duct and returned to zone R by the fan, realizing the secondary return and reuse of the positive pressure airflow in zone R, preventing the airflow in zone R from flowing to zone C, and reducing the influence of the airflow in zone R on the temperature control of zone C. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the airflow control structure of the D zone of the glass annealing furnace of the present invention;

[0018] Figure 2 It is a schematic diagram of the longitudinal section of area D;

[0019] Figure 3 One of the structural schematic diagrams of the airflow guide assembly;

[0020] Figure 4 This is the second structural schematic diagram of the airflow guide component.

[0021] Description of reference numerals in the figures:

[0022] 10. Glass belt;

[0023] 20. Zone C; 21. Upper thermocouple; 22. Lower thermocouple; 23. Pressure gauge C;

[0024] 30. D zone; 31. Upstream fixed baffle; 32. Downstream fixed baffle; 33. Return air duct; 34. Air flow guide assembly; 341. Fixed baffle for flow diversion; 342. Movable baffle for flow diversion; 35. Air collecting hood; 36. Movable baffle for upstream end; 37. Movable baffle for downstream end; 38. Pressure gauge D; 39. Return valve;

[0025] 40. R zone; 41. fan; 42. air inlet pipe; 43. heat absorption air pipe; 44. pressure gauge R; 45. air suction valve; 46. pressure relief pipe; 47. pressure relief valve; 48. air nozzle;

[0026] 50. Conveyor roller. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 communication 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.

[0030] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0031] Examples, such as Figure 1-Figure 4 As shown, an airflow control structure of a D zone of a glass annealing furnace comprises: a C zone 20 , a D zone 30 and an R zone 40 which are arranged in sequence along the conveying direction of a glass ribbon 10 .

[0032] An upstream fixed baffle 31 is installed between the C zone 20 and the D zone 30 , and a downstream fixed baffle 32 is installed between the D zone 30 and the R zone 40 .

[0033] A fan 41, an air inlet pipe 42 and a heat absorption air duct 43 are installed above the R zone 40. One end of the air inlet pipe 42 is connected to the air outlet of the fan 41, and the other end of the air inlet pipe 42 is connected to the downstream end of the R zone 40; one end of the heat absorption air duct 43 is connected to the air inlet of the fan 41, and the other end of the heat absorption air duct 43 is connected to the upstream end of the R zone 40.

[0034] A return air duct 33 is installed above the D zone 30 , one end of the return air duct 33 is connected to the D zone 30 , and the other end of the return air duct 33 is connected to the air inlet of the fan 41 .

[0035] The present invention adopts a secondary reflux method, wherein the air outlet of the fan 41 is connected to the downstream end of the R zone 40 through the air inlet pipe 42, the air inlet of the fan 41 is connected to the upstream end of the R zone 40 through the heat absorption air pipe 43, the air inlet of the fan 41 is connected to the middle of the D zone 30 through the return air pipe 33, and an upstream fixed baffle 31 is installed between the C zone 20 and the D zone 30 to prevent the gas from flowing from the D zone 30 to the C zone 20, and a downstream fixed baffle 32 is installed between the D zone 30 and the R zone 40 to prevent the gas from flowing from the R zone 40 to the D zone 30; when the positive pressure air in the R zone 40 flows to the C zone through the D zone 30, the positive pressure air in the R zone 40 flows to the D zone 30. When the positive pressure airflow passes through zone 20, most of it will be directly sucked away by the heat absorbing air duct 43 when passing through the upstream end of zone R 40, and the remaining positive pressure airflow will be blocked in zone R 40 by the fixed baffle 32 at the downstream end. A small part of the positive pressure airflow leaks to zone D 30 through the fixed baffle 32 at the downstream end, and the airflow leaked to zone D 30 is blocked in zone D 30 by the fixed baffle 31 at the upstream end. The airflow in zone D 30 is sucked into the return air duct 33 and returned to zone R 40 by the fan 41, thereby realizing the secondary return and reuse of the positive pressure airflow in zone R 40, preventing the airflow in zone R 40 from flowing to zone C 20, and reducing the influence of the airflow in zone R 40 on the temperature control of zone C 20.

[0036] It should be noted that in Figure 1 In the figure, the direction of the double arrows indicates the conveying direction of the glass ribbon 10, and the direction of the single head indicates the gas flow direction.

[0037] Specific embodiment 1, as Figure 1-Figure 4 As shown, an airflow control structure of the D zone of a glass annealing furnace comprises: a conveying roller 50 arranged along the conveying direction of the glass ribbon 10, and the conveying roller 50 passes through the C zone 20, the D zone 30 and the R zone 40 of the annealing furnace in sequence along the conveying direction of the glass ribbon 10.

[0038] An upstream fixed baffle 31 is installed between the C zone 20 and the D zone 30, and the number of the upstream fixed baffles 31 is two, and the two upstream fixed baffles 31 are installed one above and one below on the upper and lower sides of the conveying roller 50 (that is, the fixed baffle on the plate and the fixed baffle under the plate), respectively, to prevent the airflow in the D zone 30 from flowing to the C zone 20; a downstream fixed baffle 32 is installed between the D zone 30 and the R zone 40, and the number of the downstream fixed baffles 32 is two, and the two downstream fixed baffles 32 are installed one above and one below on the upper and lower sides of the conveying roller 50 (that is, the fixed baffle on the plate and the fixed baffle under the plate), respectively, to prevent the airflow in the R zone 40 from flowing to the D zone 30.

[0039] A fan 41, an air inlet pipe 42 and a heat absorption air pipe 43 are installed above the R zone 40. One end of the air inlet pipe 42 is connected to the air outlet of the fan 41, and the other end of the air inlet pipe 42 is connected to the top of the downstream end of the R zone 40, so as to input hot air to the downstream end of the R zone 40 for cooling the glass ribbon 10; one end of the heat absorption air pipe 43 is connected to the air inlet of the fan 41, and the other end of the heat absorption air pipe 43 is connected to the top of the upstream end of the R zone 40, so as to absorb the hot air from the upstream end of the R zone 40, which can not only prevent the positive pressure airflow in the R zone from flowing to the D zone 30, but also realize the recycling of the hot air inside the R zone 40.

[0040] A return air duct 33 is installed above the D zone 30, one end of which is connected to the top of the middle part of the D zone 30, and the other end of which is connected to the air inlet of the fan 41, so that the gas in the D zone 30 flows to the R zone through the fan 41, thereby reducing the air pressure difference between the C zone and the D zone and reducing the fluidity of the gas between the C zone and the D zone.

[0041] An airflow guide assembly 34 is installed in the D zone 30. The airflow guide assembly 34 is installed on the upstream side of the return air duct 33 and is used to guide the airflow in the D zone to the return air duct 33. The airflow guide assembly 34 includes a guide fixed baffle 341 and a guide movable curtain 342. The number of the guide fixed baffles 341 is two, and the two guide fixed baffles 341 are arranged at intervals along the conveying direction of the glass ribbon 10, that is, the two guide fixed baffles 341 are arranged one on the left and one on the right and along the vertical direction, and the top of the guide fixed baffle 341 is fixedly connected to the D zone 30; the guide movable curtain 342 is installed between the two guide fixed baffles 341, the guide movable curtain 342 is located below the guide fixed baffle 341, and the guide movable curtain 342 can be raised and lowered, that is, in the vertical direction, the relative position of the guide movable curtain 342 and the guide fixed baffle 341 can be adjusted.

[0042] Preferably, the downstream side surface of the guide movable curtain 342 is flush up and down, that is, the guide movable curtain 342 is arranged in the vertical direction; or the bottom end of the guide movable curtain 342 is inclined toward the downstream end of the D zone 30, that is, the distance between the bottom end of the guide movable curtain 342 and the R zone 40 is smaller than the distance between the top end of the guide movable curtain 342 and the R zone 40, so that the airflow coming from the R zone 40 turns here and enters the return air duct 33 upward.

[0043] This arrangement is because: the positive pressure airflow leaking from the annealing furnace R zone 40 to the D zone 30 flows in the lateral direction (opposite to the conveying direction of the glass ribbon 10), and an airflow guide component 34 is installed inside the D zone 30. The airflow guide component 34 is located directly above the glass ribbon 10, and the airflow guide component 34 is located on the upstream side of the top opening of the D zone 30. In this way, the airflow guide component 34 can not only prevent the positive pressure airflow from continuing to flow to the C zone 20, but also change the flow direction of the positive pressure airflow so that the positive pressure airflow flows to the return air duct 33.

[0044] More preferably, an air collecting hood 35 with a small upper part and a large lower part is installed above the D zone 30, and the size of the air collecting hood 35 is adapted to the size of the top opening of the D zone 30. One end of the return air duct 33 is connected to the top of the air collecting hood 35, and the other end of the return air duct 33 is connected to the middle part of the heat absorption air duct 43, and a return valve 39 with adjustable opening is installed on the return air duct 33, which is used to adjust the return air volume from the D zone 30 to the R zone 40.

[0045] This arrangement is because: an air collecting hood 35 is installed at the opening position on the top of the annealing furnace D zone 30, and the size of the bottom end of the air collecting hood 35 can be increased to be equal to the width of the D zone 30, so that the gas inside the D zone 30 can flow upward into the return air duct 33.

[0046] More preferably, an upstream movable curtain 36 is installed between zone C 20 and zone D 30, and the upstream movable curtain 36 is located above the conveying roller 50, and the upstream movable curtain 36 can be raised and lowered to prevent the gas in zone D 30 from flowing to zone C 20; a downstream movable curtain 37 is installed between zone D 30 and zone R 40, and the downstream movable curtain 37 is located above the conveying roller 50, and the downstream movable curtain 37 can be raised and lowered to prevent the gas in zone R 40 from flowing to zone D 30.

[0047] In other embodiments, a pressure gauge C23 is installed at the top of zone C 20, which can detect the internal pressure (air pressure) of zone C 20, an upper thermocouple 21 is installed at the top of zone C 20, and a lower thermocouple 22 is installed at the bottom of zone C 20.

[0048] A pressure gauge D38 is installed on the top of the D zone 30 , and the pressure gauge D38 can detect the internal pressure of the D zone 30 . A return valve 39 whose opening can be adjusted is installed on the return air duct 33 .

[0049] A pressure gauge R44 is installed at the top of the R zone 40, and the pressure gauge R44 can detect the internal pressure of the R zone 40. Pressure relief pipes 46 are installed at the upstream and downstream ends of the R zone 40, and a pressure relief valve 47 with adjustable opening is installed on the pressure relief pipe 46; an air suction valve 45 with adjustable opening is installed on the heat absorption air duct 43.

[0050] The reason for such arrangement is that: the internal pressure of zone C 20 can be detected in real time by pressure gauge C23, the internal pressure of zone D 30 can be detected in real time by pressure gauge D38, and the internal pressure of zone R 40 can be detected in real time by pressure gauge R44. Based on the real-time internal pressures of zone C 20, zone D 30 and zone R 40, the return air volume from zone D 30 to zone R 40 is adjusted by controlling the opening of the return valve 39 on the return air duct 33, and the suction volume of the heat absorption air duct 43 and the pressure relief air volume of the pressure relief pipe 46 are adjusted by controlling the opening of the suction valve 45 on the heat absorption air duct 43 and the opening of the pressure relief valve 47 on the pressure relief pipe 46, thereby ensuring the stability of the internal pressures of zone C 20, zone D 30 and zone R 40.

[0051] The working process of the D zone airflow control structure of the present invention is as follows:

[0052] The glass ribbon 10 is transported forward from the C zone 20, passing through the D zone 30 and the R zone 40 successively. The circulating hot air in the R zone 40 first passes through the fan 41 and enters the air nozzle 48 from the air inlet pipe 42 to blow out and cool the glass ribbon 10, and then enters the fan 41 (or is mixed with some cold air) through the heat absorption air pipe 43 and is then circulated and blown out; the heat absorption air pipe 43 is arranged at the upstream end position (also called the front end) of the R zone 40 to reduce the upstream end of the R zone 40 from entering the D zone 30. A plurality of pressure relief pipes 46 are arranged at the top of the R zone 40 to discharge the excess air in the R zone 40. The pressure relief pipes 46 are located at the top of the kiln body of the R zone 40 or at the top internode position of two R zones 40.

[0053] A fixed baffle plate on the plate, a fixed baffle plate under the plate, and a movable baffle curtain on the plate are provided at the upstream end (front end) and the downstream end (end) of the D zone 30, for isolating the air flow between the D zone 30 and the C zone 20 and between the D zone 30 and the R zone 40; a return air duct 33 and a return valve 39 connecting the D zone 30 and the fan 41 are installed at the top of the D zone 30, and the return valve 39 is used to control the airflow size of the return air duct 33, and a guide movable baffle curtain 342 and a guide fixed baffle plate 341 are installed at a position close to the upstream side of the return air duct 33, so that the airflow coming from the R zone 40 can turn here and enter the return air duct 33 upward.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A glass annealing furnace D zone airflow control structure, characterized in that: include: A C zone (20), a D zone (30) and an R zone (40) are sequentially arranged along the conveying direction of the glass ribbon (10); An upstream fixed baffle (31) is installed between the C zone (20) and the D zone (30), and a downstream fixed baffle (32) is installed between the D zone (30) and the R zone (40); A fan (41), an air inlet pipe (42) and a heat absorbing air pipe (43) are installed above the R zone (40); one end of the air inlet pipe (42) is connected to the air outlet of the fan (41), and the other end of the air inlet pipe (42) is connected to the downstream end of the R zone (40); one end of the heat absorbing air pipe (43) is connected to the air inlet of the fan (41), and the other end of the heat absorbing air pipe (43) is connected to the upstream end of the R zone (40); A return air duct (33) is installed above the D zone (30), one end of the return air duct (33) is connected to the D zone (30), and the other end of the return air duct (33) is connected to the air inlet of the fan (41).

2. The airflow control structure of the D zone of a glass annealing furnace according to claim 1, characterized in that: An airflow guide assembly (34) is installed in the D zone (30). The airflow guide assembly (34) is installed on the upstream side of the return air duct (33), and the airflow guide assembly (34) comprises a guide fixed baffle (341) and a guide movable curtain (342). The two guide fixed baffles (341) are arranged at intervals along the conveying direction of the glass ribbon (10). The top of the guide fixed baffle (341) is fixedly connected to the D zone (30). The guide movable curtain (342) is installed between the two guide fixed baffles (341). The guide movable curtain (342) is located below the guide fixed baffle (341) and can be raised and lowered.

3. The airflow control structure of the D zone of a glass annealing furnace according to claim 2, characterized in that: The bottom end of the flow-guiding movable curtain (342) is inclined toward the downstream end of the D zone (30).

4. The airflow control structure of the D zone of a glass annealing furnace according to claim 2, characterized in that: An air collecting hood (35) is installed above the D zone (30), one end of the return air duct (33) is connected to the top of the air collecting hood (35), and the other end of the return air duct (33) is connected to the heat absorbing air duct (43).

5. The airflow control structure of the D zone of a glass annealing furnace according to claim 1, characterized in that: An upstream movable curtain (36) is installed between the C zone (20) and the D zone (30), and a downstream movable curtain (37) is installed between the D zone (30) and the R zone (40).

6. The airflow control structure of the D zone of a glass annealing furnace according to any one of claims 1 to 5, characterized in that: The C zone (20) is provided with a pressure gauge C (23) for detecting the internal pressure of the C zone (20), the D zone (30) is provided with a pressure gauge D (38) for detecting the internal pressure of the D zone (30), the R zone (40) is provided with a pressure gauge R (44) for detecting the internal pressure of the R zone (40), the return air duct (33) is provided with a return valve (39) with an adjustable opening, the heat absorption air duct (43) is provided with an air intake valve (45) with an adjustable opening, and the pressure relief pipe (46) at the top of the R zone (40) is provided with a pressure relief valve (47) with an adjustable opening.

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