Method for cooling the open area of a glass annealing lehr

Abstract

The application discloses a kind of glass annealing lehr open area cooling control method, based on an intelligent system, the system includes indoor air inlet and outdoor air inlet by respective air duct converge in total air inlet, dust-proof air uniform component is arranged to indoor air inlet and outdoor air inlet port, first automatic electromagnetic valve and first temperature sensor are arranged on the air duct of indoor air inlet, second automatic electromagnetic valve and second temperature sensor are arranged on the air duct of outdoor air inlet, third temperature sensor is arranged at total air inlet, fan, its inlet is connected with total air inlet, outlet leads to annealing lehr open area, first temperature sensor, second temperature sensor, third temperature sensor, first automatic electromagnetic valve and second automatic electromagnetic valve are electrically connected to controller, the application has the following advantages: accurate control of air inlet temperature is realized, stable annealing temperature curve is realized, annealing quality is improved, glass board explosion is reduced, while reducing fan operating frequency, energy saving and cost reduction are realized.

Description

Technical Field

[0001] This invention relates to the field of glass manufacturing technology, and more specifically to a method for controlling the cooling of the open zone of a glass annealing furnace. Background Technology

[0002] With increasingly fierce market competition in the glass industry, improving product quality and reducing energy consumption have become key strategies for enterprises to meet the challenges. The annealing furnace is a core piece of equipment in glass production, used to control the cooling rate of the glass and eliminate internal stress. In the open area of ​​the annealing furnace, the cooling system regulates the temperature of the glass strip by blowing cooling air, and its performance directly affects the final quality of the glass. Traditional annealing furnace cooling systems mostly use a single indoor air intake method, that is, drawing air from inside the production workshop, pressurizing it with a fan, and then sending it into the annealing furnace.

[0003] While the above-mentioned solution is simple in structure and low in cost, the indoor air temperature is easily affected by factors such as equipment heat dissipation and seasonal changes, leading to fluctuations in the intake air temperature and consequently affecting the stability of the annealing temperature, making precise real-time control difficult. Therefore, this paper proposes an open-zone cooling control method based on an intelligent control system for the open zone cooling of a glass annealing furnace to solve the above problems. Summary of the Invention

[0004] To address the problems mentioned in the background section, the technical solution adopted by this invention is: a cooling control method for the open zone of a glass annealing furnace, based on an intelligent control system, comprising the following:

[0005] 1) The system includes:

[0006] The system includes an indoor air inlet and an outdoor air inlet, which converge at a main air inlet via their respective ducts. Both the indoor and outdoor air inlets are equipped with dustproof and air distribution components. The main air inlet is connected to an air outlet, which leads to the open area of ​​the annealing kiln.

[0007] A first automatic solenoid valve and a first temperature sensor are installed on the indoor air inlet duct.

[0008] The second automatic solenoid valve and the second temperature sensor are installed on the outdoor air inlet duct.

[0009] A third temperature sensor is installed at the main air inlet;

[0010] The fan has its inlet connected to the main air inlet and its outlet leading to the open area of ​​the annealing furnace. The first temperature sensor, the second temperature sensor, the third temperature sensor, the first automatic solenoid valve, and the second automatic solenoid valve are electrically connected to the controller, which employs a PID controller.

[0011] 2) First, by combining indoor and outdoor air inlets, the temperature difference is used to regulate the mixed air temperature;

[0012] Temperature sensors in the indoor air inlet duct, outdoor air inlet duct, and main air inlet provide real-time temperature information. The controller precisely and dynamically adjusts the air intake ratio to utilize indoor and outdoor temperature data for feedforward control. Furthermore, it achieves more precise temperature control based on different weather conditions, stabilizes the annealing temperature curve, and keeps the mixed air intake temperature within ±1°C of the set range.

[0013] The outdoor air inlet extends to the outside of the wall, and the connection between the outside of the outdoor air inlet and the wall is sealed.

[0014] As a preferred embodiment of the present invention, the dustproof and wind-distributing component includes a convex inlet, a concave slot, a dustproof and wind-distributing mesh plate, an L-shaped limiting plate, a single plate, an L-shaped insert, and a limiting rod. A convex inlet is provided on one side of both the indoor air inlet and the outdoor air inlet, and a concave slot is provided on the side of both the indoor air inlet and the outdoor air inlet facing the convex inlet.

[0015] The dustproof and wind-dissipating mesh plate is inserted into the concave slot through a convex plug. The number of convex plugs and concave slots on the indoor air inlet and the outdoor air inlet are both provided in two sets.

[0016] The top of the indoor air inlet and the outdoor air inlet are both fixedly connected to L-shaped limiting plates on both sides of the convex socket. The two sides of the L-shaped insert are slidably inserted into the inner side of the L-shaped limiting plate. A single plate is fixedly connected to the top of the L-shaped insert, and a limiting rod is fixedly connected to one end of the single plate.

[0017] The top side of the L-shaped insert slides through the outer circumference of the limiting rod. The end of the limiting rod away from the single plate is fixedly connected to a fixing plate, which is respectively fixedly connected to the top of the indoor air inlet and the outdoor air inlet.

[0018] The limiting rod is located on the outside of the fixed plate and the L-shaped insert plate, and a spring is sleeved thereon. The top of the dustproof and wind-dissipating mesh plate has a slot on the side facing the L-shaped insert plate, and the L-shaped insert plate fits into the slot.

[0019] It adopts a detachable and replaceable dustproof and air distribution component, and can use air distribution mesh plates with different mesh sizes to adjust the air distribution according to different glass processes, further assisting in precise air and temperature control.

[0020] As a preferred embodiment of the present invention, both the first automatic solenoid valve and the second automatic solenoid valve are linear regulating valves with an opening degree that is continuously adjustable within the range of 0% to 100%.

[0021] The above system is also a cooling control system for the open area of ​​a glass annealing furnace.

[0022] The present invention has the following advantages:

[0023] 1. A method for intelligent control of cooling in the open area of ​​a glass annealing furnace is proposed. This method utilizes the temperature difference between indoor and outdoor air inlets to regulate the mixed air temperature, solving the problem of temperature fluctuation in a single air inlet. Real-time temperature information is provided by temperature sensors in the indoor air inlet, outdoor air inlet, and the main air inlet, enabling the controller to precisely adjust the air inlet ratio using PID control for feedforward control. Furthermore, it can achieve precise temperature control of the mixed air temperature under different weather conditions, stabilizing the mixed air temperature within the set range, stabilizing the annealing temperature curve, and controlling temperature fluctuations within ±1°C, thus improving annealing quality and reducing glass breakage. This control method also reduces fan load, indirectly lowering fan frequency to reduce overall energy consumption. The method is simple in structure, easy to operate, and applicable to various glass production environments.

[0024] 2. The solenoid valve switch adopts an automatic adjustment method, with fast response speed and high precision, and can realize continuous proportional control, which is superior to traditional manual or on / off valves.

[0025] 3. Adopting a detachable and replaceable dustproof and air distribution component, different air distribution mesh plates can be used to adjust the air distribution according to different glass processes, so as to achieve precise air and temperature control.

[0026] The temperature control method of this invention is applicable to the open area of ​​the annealing furnace in existing large-scale high-temperature float glass production lines, and its cooling air mixing achieves intelligent control, which is very practical. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the outdoor air inlet and dustproof air distribution component structure of a preferred embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the dustproof and wind-equalizing mesh plate extraction structure of the dustproof and wind-equalizing component according to a preferred embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the internal structure of the outdoor air inlet according to a preferred embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the cooling control principle of a preferred embodiment of the present invention.

[0032] Explanation of reference numerals in the attached diagram: 1. Indoor air inlet; 2. Outdoor air inlet; 3. First automatic solenoid valve; 4. Second automatic solenoid valve; 5. Main air inlet; 6. Third temperature sensor; 7. Controller; 8. Fan; 9. Open area of ​​annealing kiln; 10. First temperature sensor; 11. Second temperature sensor; 12. Wall; 13. Air outlet; 101. Convex socket; 102. U-shaped slot; 103. Dustproof and air distribution mesh plate; 104. Bayonet; 105. L-shaped limiting plate; 106. Single plate; 107. L-shaped insert plate; 108. Limiting rod; 109. Fixing plate; 110. Spring. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The invention will now be further described with reference to the accompanying drawings.

[0036] Example 1

[0037] Please refer to the following: Figure 1 and Figure 5 The present invention provides a method for controlling cooling in the open area of ​​a glass annealing furnace, comprising the following:

[0038] 1) Includes a system, said system comprising:

[0039] Indoor air inlet 1 and outdoor air inlet 2 are connected to the main air inlet 5 through their respective air ducts. Dustproof and air distribution components are installed at the ports of indoor air inlet 1 and outdoor air inlet 2.

[0040] A first automatic solenoid valve 3 and a first temperature sensor 10 are installed on the indoor air inlet 1 duct;

[0041] The second automatic solenoid valve 4 and the second temperature sensor 11 are installed on the outdoor air inlet 2 duct;

[0042] The third temperature sensor 6 is installed at the main air inlet 5;

[0043] A fan 8 has its inlet connected to the main air inlet 5 and its outlet leading to the open area 9 of the annealing furnace. A first temperature sensor 10, a second temperature sensor 11, a third temperature sensor 6, a first automatic solenoid valve 3, and a second automatic solenoid valve 4 are electrically connected to a controller 7. The controller 7 is based on the temperature feedback control principle and uses a PID proportional-integral-derivative control algorithm or other algorithms such as fuzzy control or model predictive control to dynamically optimize the solenoid valve openings. The controller 7 simultaneously monitors the temperatures of the indoor air inlet 1, the outdoor air inlet 2, and the main air inlet 5. By comparing the mixed air temperature with the setpoint and considering changes in indoor and outdoor temperatures, the controller 7 can more accurately predict and adjust the openings of the first automatic solenoid valve 3 and the second automatic solenoid valve 4. For example, when the outdoor temperature is low, the controller 7 can increase the proportion of outdoor air intake in advance to utilize low-temperature air; when the indoor temperature fluctuates, the controller 7 can quickly compensate.

[0044] The main air inlet 5 is connected to the air outlet 13, which leads to the open area 9 of the annealing furnace. The outdoor air inlet 2 extends to the outside of the wall 12, and the connection between the outside of the outdoor air inlet 2 and the wall 12 is sealed. The controller 7 uses a PID control algorithm. The first automatic solenoid valve 3 and the second automatic solenoid valve 4 are both linear regulating valves with continuously adjustable opening degrees within the range of 0% to 100%.

[0045] 2) First, the temperature difference between the indoor and outdoor air inlets is used to adjust the mixed air temperature. Temperature sensors in the indoor air inlet, outdoor air inlet and main air inlet provide real-time temperature information. The controller precisely and dynamically adjusts the air intake ratio to use indoor and outdoor temperature data for feedforward control. Further precise temperature control is achieved according to different weather conditions to stabilize the annealing temperature curve cooling.

[0046] The controller 7 uses the real-time temperature data from the total air inlet 5 collected by the third temperature sensor 6 to compare with the set temperature value based on the glass type and production process. For example, for float glass, the set temperature range is 20-30℃, and calculates the temperature deviation. Simultaneously, the controller 7 combines data from the indoor and outdoor temperature sensors (first temperature sensor 10 and second temperature sensor 11) for feedforward control or PID parameter optimization. The PID control algorithm outputs a control signal to adjust the opening degree of the solenoid valve for proportional air mixing and temperature control based on the deviation value, deviation change rate, and cumulative deviation.

[0047] When the detected air intake temperature is higher than the set value, the controller 7 increases the opening of the second automatic solenoid valve 4 of the outdoor air intake 2, for example, by increasing the opening by 20%-25% from the current value, and decreases the opening of the indoor air intake 1, for example, by decreasing the opening by a corresponding proportion, in order to introduce more low-temperature air. If the outdoor temperature is also high, the controller 7 limits the increase of outdoor air intake and prioritizes adjusting the indoor air intake.

[0048] When the detected air inlet temperature is lower than the set value, the controller 7 increases the opening of the first automatic solenoid valve 3 of the indoor air inlet 1, for example, by 10%-20%, and decreases the opening of the outdoor air inlet 2 to improve the mixed air temperature. If the indoor temperature is low, the controller 7 can adjust the ratio more quickly. The opening ratio adjustment range is usually from 0% to 100%, and smooth control is achieved by tuning PID parameters such as proportional coefficient Kp, integral time Ti, and derivative time Td.

[0049] It can keep the mixed air intake temperature stable within ±1°C of the set range.

[0050] Controller 7 utilizes indoor and outdoor temperature data for predictive control: for example, based on weather forecasts or historical data, it adjusts the opening of solenoid valves in advance to reduce temperature fluctuations. This multi-factor dynamic adjustment still ensures that the temperature in the annealing zone remains stable within the ideal range, with fluctuations controlled within ±1°C, preventing glass breakage and cutting losses due to uneven thermal stress. The first automatic solenoid valve 3 and the second automatic solenoid valve 4 employ linear adjustment, with the opening continuously adjustable from 0% to 100%, ensuring smooth changes in the air intake ratio. The frequency of fan 8 can be adjusted according to system requirements. When the air intake temperature is low, the frequency of fan 8 can be reduced, for example, by 15%-20% to save energy. The entire control process is performed in real time, with a sampling period that can be set to a 1-5 second closed loop. Furthermore, controller 7 integrates weather forecast data or historical temperature data to further optimize feedforward control.

[0051] Example 2

[0052] Combination Figures 2-4As shown, the dustproof and air distribution assembly includes a convex inlet 101, a concave slot 102, a dustproof and air distribution mesh plate 103, an L-shaped limiting plate 105, a single plate 106, an L-shaped insert 107, and a limiting rod 108. A convex inlet 101 is provided on one side of both the indoor air inlet 1 and the outdoor air inlet 2. A concave slot 102 is provided on the side of both the indoor air inlet 1 and the outdoor air inlet 2 facing the convex inlet 101. The dustproof and air distribution mesh plate 103 is inserted into the concave slot 102 through the convex inlet 101. Two sets of convex inlets 101 and concave slots 102 are provided on both the indoor air inlet 1 and the outdoor air inlet 2. L-shaped inserts are fixedly connected to the top of both the indoor air inlet 1 and the outdoor air inlet 2 on both sides of the convex inlet 101. The limiting plate 105 and the L-shaped insert plate 107 are slidably inserted into the inner side of the L-shaped limiting plate 105 on both sides. The top of the L-shaped insert plate 107 is fixedly connected to the single plate 106. One end of the single plate 106 is fixedly connected to the limiting rod 108. The top side of the L-shaped insert plate 107 slides through the outer circumference of the limiting rod 108. The end of the limiting rod 108 away from the single plate 106 is fixedly connected to the fixing plate 109. The fixing plate 109 is fixedly connected to the top of the indoor air inlet 1 and the outdoor air inlet 2 respectively. The limiting rod 108 is located between the fixing plate 109 and the L-shaped insert plate 107 and is sleeved with a spring 110. The top of the dustproof and wind-distributing mesh plate 103 is provided with a slot 104 on the side facing the L-shaped insert plate 107. The L-shaped insert plate 107 fits into the slot 104.

[0053] When it is necessary to replace the dustproof and wind-distributing mesh plate 103, simply push the L-shaped insert plate 107 along the limit rod 108 manually. Then, the end of the L-shaped insert plate 107 will be moved out from the dustproof and wind-distributing mesh plate 103, and the dustproof and wind-distributing mesh plate 103 can be pulled out for replacement. Both the indoor air inlet 1 and the outdoor air inlet 2 are equipped with two sets of pre-installed convex inserts 101 for the dustproof and wind-distributing mesh plate 103, so that it can be replaced alternately without stopping the machine. Furthermore, by pushing the L-shaped insert plate 107 with the spring 110, it can be ensured that the L-shaped insert plate 107 is locked in the slot 104 on the dustproof and wind-distributing mesh plate 103, thus locking and limiting the installed dustproof and wind-distributing mesh plate 103.

[0054] The system employs detachable and replaceable dustproof and air distribution components. Different mesh sizes of dustproof and air distribution mesh panels can be used to adjust airflow according to different glass processing techniques, further assisting in precise airflow and temperature control. This enhances the practicality of the system or method.

[0055] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

[0056] Other parts of this invention that are not detailed herein are all prior art and will not be described further here.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling cooling in the open zone of a glass annealing furnace, based on an intelligent system, characterized in that: The methods include the following: 1) The system includes: An indoor air inlet (1) and an outdoor air inlet (2) are provided. The indoor air inlet (1) and the outdoor air inlet (2) are connected to the main air inlet (5) through their respective air ducts. Both the indoor air inlet (1) and the outdoor air inlet (2) are equipped with dustproof and air distribution components. The air outlet of the main air inlet (5) is connected to the air outlet (13). The air outlet (13) leads to the open area (9) of the annealing kiln. The first automatic solenoid valve (3) and the first temperature sensor (10) are installed on the air duct of the indoor air inlet (1). The second automatic solenoid valve (4) and the second temperature sensor (11) are installed on the air duct of the outdoor air inlet (2); A third temperature sensor (6) is installed at the main air inlet (5); A blower (8) has its inlet connected to the main air inlet (5) and its outlet leading to the open area (9) of the annealing furnace. The first temperature sensor (10), the second temperature sensor (11), the third temperature sensor (6), the first automatic solenoid valve (3), and the second automatic solenoid valve (4) are electrically connected to the controller (7). The controller (7) uses a PID controller. 2) First, adjust the mixed air temperature by combining indoor and outdoor air inlets and utilizing the temperature difference; Temperature sensors in the indoor air inlet duct, outdoor air inlet duct, and main air inlet provide real-time temperature information. The controller precisely and dynamically adjusts the air intake ratio to utilize indoor and outdoor temperature data for feedforward control. Furthermore, it enables more precise temperature control based on different weather conditions to stabilize the annealing temperature curve cooling.

2. The cooling control method for the open zone of a glass annealing furnace as described in claim 1, characterized in that, The outdoor air inlet (2) extends to the outside of the wall (12), and the connection between the outside of the outdoor air inlet (2) and the wall (12) is sealed.

3. The cooling control method for the open zone of a glass annealing furnace as described in claim 1, characterized in that, The dustproof and air distribution assembly includes a convex socket (101), a concave slot (102), a dustproof and air distribution mesh plate (103), an L-shaped limiting plate (105), a single plate (106), an L-shaped insert plate (107), and a limiting rod (108). The indoor air inlet (1) and the outdoor air inlet (2) are both provided with a convex socket (101) on one side of their ports. The indoor air inlet (1) and the outdoor air inlet (2) are both provided with a concave slot (102) on the side of their interior facing the convex socket (101).

4. A cooling control system for the open zone of a glass annealing furnace as described in claim 3, characterized in that, The dustproof and wind-dissipating mesh plate (103) is inserted into the concave slot (102) through the convex socket (101). The number of convex sockets (101) and concave slots (102) on the indoor air inlet (1) and the outdoor air inlet (2) are both provided in two sets.

5. A cooling control system for the open zone of a glass annealing furnace as described in claim 4, characterized in that, The top of the indoor air inlet (1) and the outdoor air inlet (2) are fixedly connected to L-shaped limiting plates (105) on both sides of the convex socket (101). The L-shaped insert (107) is slidably inserted into the inner side of the L-shaped limiting plate (105) on both sides. The top of the L-shaped insert (107) is fixedly connected to a single plate (106), and one end of the single plate (106) is fixedly connected to a limiting rod (108).

6. A cooling control system for the open zone of a glass annealing furnace as described in claim 4, characterized in that, The top side of the L-shaped insert (107) slides through the outer circumference of the limiting rod (108). The end of the limiting rod (108) away from the single plate (106) is fixedly connected to a fixing plate (109). The fixing plate (109) is fixedly connected to the top of the indoor air inlet (1) and the outdoor air inlet (2) respectively.

7. A cooling control system for the open zone of a glass annealing furnace as described in claim 4, characterized in that, The limiting rod (108) is located between the fixing plate (109) and the L-shaped insert plate (107) and is sleeved with a spring (110). The top of the dustproof and wind-dissipating mesh plate (103) is provided with a slot (104) on the side facing the L-shaped insert plate (107). The L-shaped insert plate (107) fits into the slot (104).

8. A cooling control system for the open zone of a glass annealing furnace as described in claim 1, characterized in that, The first automatic solenoid valve (3) and the second automatic solenoid valve (4) are both linear regulating valves with continuously adjustable opening degree in the range of 0% to 100%.

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