A cooling system for zones A and B of a glass annealing furnace

Abstract

The present invention provides a cooling system for zones A and B of a glass annealing furnace, comprising a cooling device for zone A, a cooling device for zone B and a fan air outlet system. The zones A and B focus on wind pressure adjustment, and the fans in zones A and B have consistent design requirements for the fans. The present invention combines the fan air outlet systems of zones A and B, that is, zones A and B share one fan, thereby reducing the number of fans, avoiding fan dispersion and numerous control points, and facilitating production operation and stability. At the same time, it can meet the mutual allocation of air volumes in zones A and B, ensuring the air volume required for glass annealing in the two zones, thereby improving the annealing quality of the glass and the glass yield.

Description

Technical Field

[0001] The invention relates to the technical field of glass annealing furnaces, and in particular to a cooling system for A and B zones of a glass annealing furnace. Background Art

[0002] The general process flow of a flat glass production line is: batching-melting-forming-annealing-cutting-stacking. Among them, the annealing stage is completed in an annealing furnace of a certain length after the glass is formed. The glass plate belt is driven by the rotating annealing roller and slowly passes through the annealing furnace at a certain speed. The glass is cooled and cooled in the process of passing through the annealing furnace. The cooling process can be divided into multiple areas according to the process requirements. Each area is cooled at a different cooling rate according to the requirements. Finally, the glass belt passing through the annealing furnace eliminates the internal stress of the glass, meets the cutting stress requirements of the subsequent cold end process, and ensures the stress required for the internal structural strength of the glass.

[0003] At present, annealing furnaces can usually be divided into multiple areas such as Zone A, Zone B, Zone C, Zone D, Zone Ret, Zone E, and Zone F. Each area is equipped with a fan, corresponding air duct, and butterfly valve to control the cooling rate and intensity according to the cooling requirements. During the cooling process, appropriate heating and insulation measures are also required to ensure that the glass ribbon is cooled according to the cooling rate required by different areas, to avoid cracking, warping, and other phenomena of the glass plate during the annealing and cooling process, resulting in glass breakage and reduced yield. As we all know, Zone A, Zone B, and Zone C are annealing zones, which are key areas that affect the annealing quality and yield of glass. Among them, Zone A and Zone B focus on wind pressure adjustment, and Zone C focuses on air volume adjustment. The three zones are used in combination to eliminate the permanent stress remaining in the glass during the molded glass and improve the mechanical strength of the glass.

[0004] In the prior art, each of Zone A, Zone B and Zone C is equipped with an independent fan and an external air duct connected to the fan. The external air duct is connected to the inlet and outlet air ducts of the three zones. The air volume in the three zones is controlled by adjusting the speed of the fan and the opening of the air valve on the inlet and outlet air ducts. In addition, considering the risks of equipment failure to production in actual applications, each zone is usually equipped with two fans, one for backup and one for use. Each fan is equipped with a gate valve, a frequency converter and other devices, and a control cabinet is also configured in the control room. However, the above configuration will lead to a large number of fans. For example, for a single float line, the number of fans required to be configured in the three zones of annealing kiln A, B and C is at least 6, while for the photovoltaic calendering production line, according to 1 kiln 5 lines or 1 kiln 6 lines, the number of fans required to be configured reaches more than 30, which will lead to a complex duct structure, many points that need to be monitored and operated during production, and a large workload for operation and maintenance. At the same time, a large number of fans will also cause inconvenience in process adjustment. For example, in actual production, there is a problem of mismatched air volume between area A and area B (insufficient air volume in area A, but sufficient air volume in area B). However, since the fan systems in areas A and B are independent and not interconnected, they cannot be interconnected to reasonably adjust the air volume, which ultimately affects the quality of glass annealing. In addition, the utilization rate of the fans is low, which can easily lead to a large waste of energy. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a cooling system for zones A and B of a glass annealing furnace. By merging the fan systems of zones A and B, the cooling system is simplified, the equipment configuration is reduced, and the mutual allocation of the air volume of zones A and B can be met to ensure the air volume required for glass annealing, thereby improving the annealing quality of the glass and the glass yield.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a cooling system for zones A and B of a glass annealing furnace, comprising a cooling device for zone A, a cooling device for zone B and a fan air outlet system.

[0008] Preferably, the zone A cooling device comprises: a plurality of zone A upper cooling air ducts, a plurality of zone A lower cooling air ducts, a first collecting air duct connected to the air outlets of each zone A upper cooling air duct, and a second collecting air duct connected to the air outlets of each zone A lower cooling air duct.

[0009] Preferably, the B zone cooling device comprises: a plurality of upper cooling air ducts in the B zone, a plurality of lower cooling air ducts in the B zone, a first collecting air outlet duct connected to the air outlets of the upper cooling air ducts in the B zone, and a third collecting air duct connected to the air outlets of the lower cooling air ducts in the B zone.

[0010] Preferably, the fan air outlet system includes a first fan, a second fan, a second collecting air outlet duct and a first collecting main air duct.

[0011] Preferably, the air outlet of the first collecting air duct is connected with the air inlet of the second collecting air outlet duct, the air outlet of the second collecting air duct and the air outlet of the third collecting air duct are respectively connected with the air inlet of the first collecting air outlet duct, the air outlet of the first collecting air outlet duct and the air outlet of the second collecting air outlet duct are respectively connected with the air inlet of the first collecting main air duct, and the air outlet of the first collecting main air duct is respectively connected with the air inlet of the first fan and the air inlet of the second fan.

[0012] Preferably, the fan air outlet system also includes a first collecting main air outlet duct.

[0013] Preferably, the air outlet of the first fan and the air outlet of the second fan are respectively connected to the air inlet of the first collecting main air outlet duct.

[0014] Preferably, the first fan and the second fan are respectively mounted on the housing of the B zone cooling device.

[0015] Preferably, the plurality of upper cooling air ducts in zone A and the plurality of lower cooling air ducts in zone A are horizontally distributed.

[0016] Preferably, the plurality of upper cooling air ducts in zone B and the plurality of lower cooling air ducts in zone B are horizontally distributed.

[0017] Preferably, the plurality of upper cooling air ducts in zone A and the plurality of lower cooling air ducts in zone A are all provided with control valves.

[0018] Preferably, the plurality of upper cooling air ducts in zone B and the plurality of lower cooling air ducts in zone B are provided with control valves.

[0019] Preferably, the first air outlet converging pipe and the second air outlet converging pipe are respectively provided with control valves.

[0020] Preferably, the air inlet and the air outlet of the first fan are respectively provided with control valves.

[0021] Preferably, the air inlet and the air outlet of the second fan are respectively provided with control valves.

[0022] Preferably, the control valve is a manual control valve or an automatic control valve.

[0023] Preferably, the cooling device in zone A and the cooling device in zone B also include temperature measuring elements.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a simplified cooling system for zones A and B of an annealing furnace, which combines the fan outlet systems of zones A and B, that is, zones A and B share one fan, thereby reducing the number of fans, avoiding fan dispersion and numerous control points, and facilitating production operation and stability. At the same time, the air volume of zones A and B can be adjusted to ensure the air volume required for glass annealing in the two zones, thereby improving the annealing quality of the glass and the glass yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the structural schematic diagram of the cooling system of the A and B zones;

[0027] Among them, 1 is the upper cooling air duct of zone A, 2 is the lower cooling air duct of zone A, 3 is the first collecting air duct, 4 is the second collecting air duct, 5 is the upper cooling air duct of zone B, 6 is the lower cooling air duct of zone B, 7 is the third collecting air duct, 8 is the second collecting air outlet duct, 9 is the first collecting air outlet duct, 10 is the control valve, 11 is the first collecting main air duct, 12 is the first fan, 13 is the second fan, and 14 is the first collecting main air outlet duct. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0029] In view of the problem that the fan systems in zones A and B of an annealing furnace in a glass production line in the prior art are independent and not interconnected, and cannot be interconnected to reasonably adjust the air volume, the present invention provides a cooling system for zones A and B of a glass annealing furnace, which combines the fans in zones A and B for use, and comprises a cooling device for zone A, a cooling device for zone B, and a fan air outlet system.

[0030] In the present invention, the A zone cooling device comprises: a plurality of upper cooling air ducts 1 in the A zone, a plurality of lower cooling air ducts 2 in the A zone, a first collecting air duct 3 connected to the air outlet of each upper cooling air duct in the A zone, and a second collecting air duct 4 connected to the air outlet of each lower cooling air duct in the A zone. The present invention has no particular restriction on the number of upper cooling air ducts and lower cooling air ducts in the A zone. In actual production, the corresponding shapes (such as circular tubes or rectangular parallelepiped shapes), specifications and quantities of upper cooling air ducts 1 in the A zone and lower cooling air ducts 2 in the A zone can be selected according to needs. In some specific embodiments of the present invention, the upper cooling air ducts 1 in the A zone and the lower cooling air ducts 2 in the A zone are both horizontally distributed. In some specific embodiments of the present invention, each cooling air duct involved in the A zone cooling device is provided with a control valve 10, and the control valve 10 can be manually controlled or automatically controlled. The air volume is mainly controlled by controlling the opening of the valve in actual production. In some specific embodiments of the present invention, the air inlet of the zone A cooling device is at the entrance of zone A, and the air outlet is at the end of zone A, that is, in the zone A cooling device, the wind flow direction is consistent with the forward direction of the glass plate, that is, co-current cooling.

[0031] In the present invention, the B zone cooling device comprises: a plurality of upper cooling air ducts 5 in the B zone, a plurality of lower cooling air ducts 6 in the B zone, a first collecting air outlet duct 9 connected to the air outlets of the upper cooling air ducts in the B zone, and a third collecting air duct 7 connected to the air outlets of the lower cooling air ducts in the B zone. The present invention has no special restrictions on the number of the upper cooling air ducts 5 and the lower cooling air ducts 6 in the B zone. In actual production, the upper cooling air ducts 5 and the lower cooling air ducts 6 in the B zone of corresponding shapes (such as circular tubes or rectangular parallelepiped shapes), specifications and quantities can be selected as needed. In some specific embodiments of the present invention, the upper cooling air ducts 5 and the lower cooling air ducts 6 in the B zone are both horizontally distributed. In some specific embodiments of the present invention, each cooling air duct involved in the B zone cooling device is provided with a control valve 10, and the control valve 10 can be manually controlled or automatically controlled. The air volume is mainly controlled by controlling the opening of the valve in actual production. In some specific embodiments of the present invention, the air inlet of the B zone cooling device is at the end of the B zone, and the air outlet is at the entrance of the B zone, that is, in the B zone cooling device, the wind flow direction is opposite to the forward direction of the glass plate, that is, countercurrent cooling.

[0032] In the present invention, the fan air outlet system includes: a first fan 12, a second fan 13, a second collecting air outlet pipe 8 and a first collecting main air pipe 11. In the present invention, the air outlet of the first collecting air pipe 3 is connected to the air inlet of the second collecting air outlet pipe 8, the air outlet of the second collecting air pipe 8 and the air outlet of the third collecting air pipe 7 are respectively connected to the air inlet of the first collecting air outlet pipe 9, the air outlet of the first collecting air outlet pipe 9 and the air outlet of the second collecting air outlet pipe 8 are respectively connected to the air inlet of the first collecting main air pipe 11, and the air outlet of the first collecting main air pipe 11 is respectively connected to the air inlet of the first fan 12 and the air inlet of the second fan 13. In the present invention, the fan air outlet system preferably also includes a first collecting main air outlet pipe 14, the air outlet of the first fan 12 and the air outlet of the second fan 13 are respectively connected to the air inlet of the first collecting main air outlet pipe 14, and the air outlet of the first collecting main air outlet pipe 14 is connected to the atmosphere.

[0033] It should be noted that the first fan 12 and the second fan 13 are in a "one standby and one in use" relationship. In actual production applications, only one fan needs to be turned on. In the present invention, the first fan 12 and the second fan 13 are both installed on the housing of the cooling device in zone B.

[0034] In some specific embodiments of the present invention, in order to facilitate the control of the air volume in each area, the first collecting air outlet duct and the second collecting air outlet duct are both provided with a control valve 10, the air inlet and air outlet of the first fan 11 are respectively provided with a control valve 10, and the air inlet and air outlet of the second fan 12 are also respectively provided with a control valve 10. The control valve 10 is manually controlled or automatically controlled, and the air volume can be effectively controlled by automatically or manually controlling the opening of the valve.

[0035] In a specific embodiment of the present invention, the cooling device in zone A and the cooling device in zone B further include a temperature measuring element, and the temperature measuring element includes an infrared instrument and a thermocouple. The present invention has no particular restriction on the number of infrared instruments and thermocouples, and they can be set according to actual production needs. In the present invention, the cooling device in zone A and the cooling device in zone B preferably also include a temperature DCS control system for monitoring the ambient temperature in the cooling device in zone A and the cooling device in zone B.

[0036] In the present invention, the glass is first sent into the annealing furnace A by the transmission roller, and the preliminary annealing is first carried out in the A zone, and the glass is cooled by the upper and lower cooling air ducts of the A zone to make the glass temperature as uniform as possible. Among them, the wind of the upper and lower cooling air ducts of the A zone is respectively collected to the second air outlet duct through the first collecting air duct and the second collecting air duct, and then collected to the first collecting main air duct, and finally sent to the first collecting main air outlet duct by the fan, and directly discharged to the outside of the factory. Then, the glass enters the annealing furnace B zone, and the glass is further cooled by the upper and lower cooling air ducts of the B zone, so that the residual stress of the glass is controlled within the allowable range. Among them, the wind of the lower cooling air duct of the B zone is collected by the third collecting air duct and directly collected with the wind of the upper cooling air duct of the B zone to the first collecting air outlet duct, and then collected to the first collecting main air duct, and finally sent to the first collecting main air outlet duct by the fan, and directly discharged to the outside of the factory.

[0037] The present invention combines a total of 4 fans in areas A and B (2 for use and 2 for backup) into 2 fans (1 for use and 1 for backup), which can reduce 2 fans. At the same time, the air exhaust ports in areas A and B are concentrated at the outlet of area A and the entrance of area B, and the two air exhaust ports are adjacent to each other, which is convenient for the arrangement of air ducts. At the same time, after the fans in areas A and B are merged, if the air volume in area A is insufficient, and there is still surplus in area B, the air volume in area B can be allocated to area A to solve the problem of insufficient air volume in area A. At the same time, since the air volume can be allocated between areas A and B, the total installed power of the fans in areas A and B can be appropriately reduced, reducing investment and energy consumption in later operation. In addition, the fans after the merger of areas A and B can be placed at the closest distance to the central control room, so that there are fewer cables and signal lines from the fans to the control cabinet, which can save investment costs.

[0038] In order to further illustrate the present invention, a 750 tons / day one kiln five-line solar photovoltaic production line is taken as an example for detailed description.

[0039] Example 1

[0040] Among them, the structural schematic diagram of the cooling system of the annealing furnace A and B zones is as follows Figure 1As shown, 1 is the upper cooling duct of zone A, 2 is the lower cooling duct of zone A, 3 is the first collecting duct, 4 is the second collecting duct, 5 is the upper cooling duct of zone B, 6 is the lower cooling duct of zone B, 7 is the third collecting duct, 8 is the second collecting outlet duct, 9 is the first collecting outlet duct, 10 is the control valve, 11 is the first collecting main duct, 12 is the first fan, 13 is the second fan, and 14 is the first collecting main outlet duct. The results show that after the transformation of the cooling system of zones A and B, the production capacity of glass increased to 800 tons / day, the maximum pulling capacity increased from 140 tons / day before the transformation to 170 tons / day, and the thickness of glass products increased from 2 to 8 mm to 1.6 to 8 mm. After the transformation of the fan system, the structure and operation adjustment of the annealing kiln wind system were simplified, and the cooling capacity of the annealing kiln was improved, especially in the 2mm production, before the transformation, the fans of zones A and B were running at full power, the air valves were fully opened, and the cooling effect of the glass plate was still poor, and the glass deformation was obvious. In the 2mm production after the transformation, the fan operates at about 60% power, and the air valve opening has a margin (85% for the middle valve under the plate glass, 70% for the edge valve, 75% for the middle valve on the glass plate, and 65% for the edge). It can be seen that the annealing capacity is greatly improved, the glass deformation is reduced, the glass annealing quality and cutting quality are improved, and the yield rate is increased by 1.5%.

[0041] The present invention has statistically analyzed the equipment configurations before and after the fans in zones A and B are combined, and the results are shown in Table 1 below:

[0042] Table 1

[0043]

[0044] As can be seen from the table above, the merging of fans in zones A and B can effectively reduce the number of fans equipped for glass production in photovoltaic lines or float lines. The number of fans that can be reduced in photovoltaic line applications is relatively large, and the adverse effects of fan merging may be smaller in the photovoltaic line annealing process system compared to the float line. The reason is that the tight patterns on the surface of photovoltaic rolled glass products fully release surface stress, have a strong ability to adapt to disturbances in the annealing process, and are more likely to achieve stable process conditions. Therefore, the merging of fans in zones A and B has more advantages in the promotion and application of photovoltaic lines.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cooling system for zones A and B of a glass annealing furnace, characterized in that: It includes cooling device in zone A, cooling device in zone B and fan outlet system; The A zone cooling device comprises: a plurality of upper cooling air ducts of the A zone, a plurality of lower cooling air ducts of the A zone, a first collecting air duct connected to the air outlets of the upper cooling air ducts of each A zone, and a second collecting air duct connected to the air outlets of the lower cooling air ducts of each A zone; The B zone cooling device comprises: a plurality of upper cooling air ducts of the B zone, a plurality of lower cooling air ducts of the B zone, a first collecting air outlet duct connected to the air outlets of the upper cooling air ducts of each B zone, and a third collecting air duct connected to the air outlets of the lower cooling air ducts of each B zone; The fan air outlet system comprises a first fan, a second fan, a second collecting air outlet duct and a first collecting main air duct; The air outlet of the first collecting air duct is connected with the air inlet of the second collecting air outlet duct, the air outlet of the second collecting air duct and the air outlet of the third collecting air duct are respectively connected with the air inlet of the first collecting air outlet duct, the air outlet of the first collecting air outlet duct and the air outlet of the second collecting air outlet duct are respectively connected with the air inlet of the first collecting main air duct, and the air outlet of the first collecting main air duct is respectively connected with the air inlet of the first fan and the air inlet of the second fan.

2. The cooling system of the glass annealing furnace A and B zones according to claim 1, characterized in that: The fan air outlet system also includes a first collecting main air outlet pipe; The air outlet of the first fan and the air outlet of the second fan are respectively connected to the air inlet of the first collecting main air outlet duct.

3. The cooling system of the glass annealing furnace A and B zones according to claim 1, characterized in that: The first fan and the second fan are respectively mounted on the housing of the B zone cooling device.

4. The cooling system of the glass annealing furnace A and B zones according to claim 1, characterized in that: The plurality of upper cooling air ducts in zone A and the plurality of lower cooling air ducts in zone A are distributed horizontally.

5. The cooling system of the glass annealing furnace A and B zones according to claim 1, characterized in that: The plurality of upper cooling air ducts in zone B and the plurality of lower cooling air ducts in zone B are distributed horizontally.

6. The cooling system of the glass annealing furnace A and B zones according to claim 1, characterized in that: The plurality of upper cooling air ducts in zone A and the plurality of lower cooling air ducts in zone A are provided with control valves; The plurality of upper cooling air ducts in zone B and the plurality of lower cooling air ducts in zone B are all provided with control valves.

7. The cooling system of the glass annealing furnace A and B zones according to claim 1, characterized in that: The first air collecting outlet pipe and the second air collecting outlet pipe are respectively provided with control valves.

8. The cooling system of the glass annealing furnace A and B zones according to claim 1, characterized in that: The air inlet and the air outlet of the first fan are respectively provided with control valves; The air inlet and the air outlet of the second fan are respectively provided with control valves.

9. The cooling system of the glass annealing furnace A and B zones according to any one of claims 6 to 8, characterized in that: The control valve is a manual control valve or an automatic control valve.

10. The cooling system of the glass annealing furnace A and B zones according to claim 1, characterized in that: The A zone cooling device and the B zone cooling device also include temperature measuring elements.

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