Mini LED backplane glass melting furnace runner temperature control method

Abstract

The application discloses a Mini LED backboard glass melting furnace runner temperature control method, and belongs to the technical field of Mini LED backboard glass production. The application adjusts and controls the runner temperature from four aspects of runner sealing performance, cooling part LPG spray gun natural gas flow, necking water bag pressure depth and small furnace natural gas flow, so that the stability of the runner temperature is ensured.

Description

Technical Field

[0001] This invention relates to the field of Mini LED backplane glass production technology, specifically to a method for controlling the temperature of the flow channel in a Mini LED backplane glass melting furnace. Background Technology

[0002] In the float glass melting process, the four key stability factors are temperature stability, pressure stability, liquid level stability, and bubble boundary stability. Temperature stability is the most crucial, highlighting its paramount importance. In the production of Mini LED backplane glass, hot-end temperature control is particularly critical, as temperature variations directly impact glass forming and yield in subsequent processes.

[0003] In float glass production, the temperature of the molten glass in the forming section is a crucial indicator of glass forming quality. Because measuring and controlling the molten glass temperature in the forming section is relatively difficult, the temperature of the molten glass in the runner is used as the control parameter throughout the production process. Temperature primarily affects the viscosity of the molten glass; a higher runner temperature results in lower viscosity, meaning that with the same flow gate opening, more molten glass flows to the tin bath, and vice versa. Fluctuations in the runner temperature will also alter the amount of molten glass flowing to the tin bath, affecting glass forming. Therefore, maintaining the stability of the runner temperature is extremely important.

[0004] Chinese invention patent CN113636743A discloses a method and device for balancing the temperature of rolled glass melt flow channels. The method involves arranging multiple sets of vertically positioned columnar flow-dispersing components along the flow path of the molten glass. This causes the molten glass flowing along the flow channel to be guided by the vertically positioned columnar flow-dispersing components to undergo multiple lateral diversions, thereby increasing the flow rate of the molten glass at the edges of the flow channel. The balancing device includes multiple sets of vertically positioned columnar flow-dispersing components arranged along the flow direction of the molten glass within the flow channel. Each columnar flow-dispersing component has a flow-facing surface facing the molten glass. This patent can effectively reduce the lateral temperature difference of the molten glass in the flow channel, significantly reducing the temperature difference when the molten glass enters the rolling mill for forming, thereby improving the production quality of glass sheets and increasing production efficiency. However, this patent can only balance the temperature of the rolled glass flow channel and reduce the lateral temperature difference within the flow channel; it cannot solve the problem of how to restore the temperature to the normal range when the flow channel temperature exceeds the normal process temperature range. Therefore, to address this problem, it is necessary to develop a method to control the flow channel temperature and keep it within the normal process temperature range. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for controlling the flow channel temperature of a Mini LED backplate glass melting furnace. The method adjusts and controls the flow channel temperature from four aspects: flow channel sealing, LPG lance natural gas flow rate in the cooling section, pressure depth of the bottleneck water tank, and natural gas flow rate in the final small furnace, thereby ensuring the stability of the flow channel temperature.

[0006] The technical solution of this invention is as follows:

[0007] The method for controlling the flow channel temperature of the glass melting furnace for Mini LED backplates, and the adjustment method when the flow channel temperature exceeds the normal temperature range, are as follows:

[0008] S1 Flow channel sealing: Check if the flow channel is not sealed properly. If so, seal the flow channel. If not, check if the temperature of the cooling section is within the normal temperature range.

[0009] The flow channel monitoring imaging can clearly show that if the flow channel is not properly sealed, flames will emerge from the flow channel, causing a large amount of heat loss and making it difficult to stabilize the flow channel temperature. In this case, the flow channel should be sealed. After the flow channel is properly sealed, no flames will emerge, the influence of the outside on the flow channel temperature will be reduced, and it will help stabilize the flow channel temperature.

[0010] S2 Cooling Section Temperature: If the cooling section temperature is within the normal range, adjust the flow channel gate opening until the flow channel temperature returns to normal. If the cooling section temperature is outside the normal range, adjust the LPG natural gas opening in the cooling section until the cooling section temperature returns to normal, and simultaneously check whether the temperature at the bottleneck is within the normal range. Because abnormal cooling section temperature is usually caused by changes in the temperature at the front end, after adjusting the cooling section temperature to the normal range, it is also necessary to recheck whether the temperature at the front bottleneck has changed.

[0011] The principle behind adjusting the flow channel gate opening to control the flow channel temperature is as follows: the temperature at the flow channel mainly depends on the molten glass. When the amount of molten glass drawn increases, the flow rate of molten glass from the furnace to the tin bath increases, leading to an increase in the flow rate in the flow channel and thus a rise in the flow channel temperature. Conversely, reducing the amount of drawing causes the flow channel temperature to decrease. Adjusting the flow channel gate is the primary means of controlling the molten glass flow rate. When the flow channel gate is lowered, the molten glass flow rate decreases, causing the flow channel temperature to drop.

[0012] S3 Bottleneck Temperature: If the bottleneck temperature is within the normal range, the adjustment ends. If the bottleneck temperature exceeds the normal range, adjust the pressure depth of the bottleneck water tank until the bottleneck temperature returns to normal. Simultaneously, adjust the LPG natural gas opening in the cooling section to its original value and check if the clarifier temperature is within the normal range. Fluctuations in the bottleneck temperature are usually caused by changes in the temperature of the upstream clarifier. Therefore, after adjusting the bottleneck temperature to the normal range, it is necessary to verify whether the upstream clarifier temperature has changed. At the same time, while adjusting the bottleneck temperature, the LPG natural gas opening in the cooling section should also be adjusted to its original value to prevent the cooling section temperature from exceeding the normal range again after the bottleneck temperature adjustment.

[0013] S4 Clarifying Section Temperature: If the clarifying section temperature is within the normal temperature range, the adjustment ends; if the clarifying section temperature exceeds the normal temperature range, adjust the opening of the natural gas injection gun at the end of the clarifying section to the small furnace until the clarifying section temperature returns to normal. At the same time as adjusting the clarifying section temperature, adjust the pressure depth of the bottleneck water tank to restore it to the original value to avoid the temperature at the bottleneck exceeding the normal temperature range again after the clarifying section temperature is adjusted.

[0014] Preferably, in step S2, the method for adjusting the opening of the flow channel gate is as follows: adjust the flow channel gate by 1 mm every 30 minutes. The adjustment range of the flow channel gate opening can be set to ±5 mm, that is: when the temperature slowly decreases, raise the flow channel gate by 1-5 mm, adjusting by 1 mm every 30 minutes. At this time, the glass melt flow rate increases, and the flow channel temperature rises until the flow channel temperature returns to normal; when the temperature slowly increases, lower the flow channel gate by -1 to -5 mm, adjusting by 1 mm every 30 minutes. At this time, the glass melt flow rate decreases, and the flow channel temperature decreases until the flow channel temperature returns to normal.

[0015] Preferably, in step S2, the method for adjusting the LPG natural gas opening of the cooling section is to adjust the opening by 1% every 30 minutes.

[0016] Generally, the temperature of the cooling section mostly originates from the pre-melting zone. The LPG lance is the primary heat input for the cooling section itself. The natural gas and combustion air supply to the cooling section lance are automatically controlled by the system after parameter settings are configured, allowing for simultaneous heating from both sides without the need for flame replacement. Due to the relatively small volume of natural gas, short-flame or flameless combustion is typically used within the furnace to maintain the cooling gradient of the molten glass in the cooling section. The gas flow rate of the lance also affects the temperature change in the flow channel. Initially, the standard LPG natural gas opening for the cooling section is set to 80%. If the drawing volume remains unchanged but the flow channel temperature changes, it is necessary to consider whether there is a fluctuation in the cooling section temperature. If the cooling section temperature exceeds the normal temperature range, the LPG natural gas opening for the cooling section is adjusted, with a maximum adjustment of ±5%, and an adjustment of ±1% every 30 minutes until the cooling section temperature returns to normal.

[0017] Preferably, in step S3, the method for adjusting the pressure depth of the neck-clamping water bag is as follows: adjust the pressure depth of the neck-clamping water bag by 1 mm every 30 minutes.

[0018] As a crucial piece of equipment within the furnace, the necking water ladle plays a vital role in raising the temperature of the melting section and lowering the temperature of the cooling section. The deeper the necking water ladle is inserted into the molten glass, the lower the proportion of molten glass passing through the surface layer and the higher the proportion of molten glass in the lower layer, resulting in a decrease in the temperature of the molten glass itself. Furthermore, the relatively low temperature of the necking water ladle further reduces the temperature of the molten glass passing through it.

[0019] When the flow channel temperature decreases due to changes in the pressure depth of the bottleneck water bath, the pressure depth of the bottleneck water bath can be adjusted within a range of ±1 to 5 mm. Specifically, when the temperature at the bottleneck decreases slowly, the pressure depth of the bottleneck water bath is increased by 1-5 mm (adjusted by 1 mm every 30 minutes). At this time, the proportion of surface molten glass passing through the bottleneck water bath increases, and the temperature rises until the temperature at the bottleneck returns to normal. When the temperature rises slowly, the pressure depth of the bottleneck water bath is decreased by -1 to -5 mm (adjusted by 1 mm every 30 minutes). At this time, the proportion of surface molten glass passing through the bottleneck water bath decreases, and the temperature drops until the temperature at the bottleneck returns to normal.

[0020] Preferably, in step S4, the method for adjusting the opening of the natural gas lance of the small furnace is to adjust the opening by 1% every 30 minutes.

[0021] The final furnace in the kiln plays a crucial role in maintaining a stable temperature in the refining section. The amount of natural gas used in the final furnace affects the temperature of the molten glass in the refining section, indirectly influencing the flow channel temperature. When changes in the natural gas usage in the final furnace cause temperature variations in the refining section, leading to fluctuations in the flow channel temperature, the natural gas usage in the final furnace should be adjusted. A standard natural gas flow rate of 80% can be established, with an adjustment range of ±5%. That is, when the temperature in the refining section slowly decreases or increases, the natural gas flow rate in the final furnace should be adjusted, with a maximum adjustment of ±5%, and the opening adjusted by ±1% every 30 minutes until the temperature in the refining section returns to normal.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] This invention adjusts and controls the flow channel temperature from four aspects: flow channel sealing, LPG natural gas flow rate in the cooling section, pressure depth of the bottleneck water tank, and natural gas flow rate in the final small furnace, ensuring the stability of the flow channel temperature. Through the systematic adjustment methods of this invention, flow channel temperature control becomes faster and more convenient, effectively guaranteeing the yield of the production line. Attached Figure Description

[0024] Figure 1 This is a flowchart illustrating the present invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention.

[0026] In the Mini LED backplane glass furnace, the standard ranges for the flow channel temperature, cooling section temperature, necking temperature, and final furnace temperature are set as follows: 1250℃±2℃, 1300℃±2℃, 1450℃±2℃, and 1540℃±2℃, respectively. Temperatures within the standard range are considered normal under operating conditions. If the temperature exceeds the upper or lower limit, the flow channel temperature needs to be adjusted to ensure its stability.

[0027] When the flow channel temperature exceeds the normal temperature range, the adjustment method is as follows:

[0028] S1 Flow channel sealing: Check if the flow channel is not sealed properly. If so, seal the flow channel. If not, check if the temperature of the cooling section is within the normal temperature range.

[0029] S2 Cooling Section Temperature: If the cooling section temperature is within the normal temperature range, adjust the flow channel gate opening until the flow channel temperature returns to normal; if the cooling section temperature is not within the normal temperature range, adjust the LPG natural gas opening of the cooling section until the cooling section temperature returns to normal, and at the same time check whether the temperature at the bottleneck is within the normal temperature range.

[0030] S3 Bottleneck Temperature: If the bottleneck temperature is within the normal temperature range, the adjustment ends; if the bottleneck temperature exceeds the normal temperature range, adjust the bottleneck water pressure depth until the bottleneck temperature returns to normal, and at the same time adjust the LPG natural gas opening of the cooling section to the original value, and check whether the temperature of the clarifier is within the normal temperature range.

[0031] S4 Clarifying Section Temperature: If the clarifying section temperature is within the normal temperature range, the adjustment ends; if the clarifying section temperature exceeds the normal temperature range, adjust the opening of the natural gas injection gun at the end of the clarifying section to the small furnace until the clarifying section temperature returns to normal, and at the same time adjust the pressure depth of the bottleneck water tank to restore it to the original value.

[0032] Example 1

[0033] The production line flow channel temperature changed, and the monitored flow channel temperature dropped to 1247.3℃. At this time, the flow channel monitoring imaging showed no flame emission, indicating that there was no problem with the flow channel sealing. Subsequently, the staff confirmed the temperature of the cooling section and found that it was 1300.4℃, which was within the normal temperature range and showed a stable trend. Then, the tin bath pull was checked and found to be reduced. At this time, the flow channel gate opening was raised by 1mm to increase the glass melt flow. After two adjustments, each lasting 30 minutes and taking 1 hour, the flow channel gate was finally raised by 2mm, and the flow channel temperature returned to normal.

[0034] Example 2

[0035] The flow channel temperature in the production line changed, and the monitored flow channel temperature dropped to 1247.5℃. At this point, observation via flow channel monitoring imaging showed no flame emission, indicating no issue with a leaky flow channel seal. Subsequently, the temperature of the cooling section was checked and found to be 1297.8℃ and still slowly decreasing. The LPG natural gas flow rate in the cooling section was increased by 1% to increase the natural gas flow and raise the cooling section temperature. After this adjustment, the flow channel temperature returned to normal within 30 minutes. While maintaining the flow channel temperature, the temperature at the bottleneck of the melting furnace was checked again and found to have also decreased to 1447.7℃. This indicates that the flow channel temperature change was influenced by changes in the bottleneck temperature or temperature changes further upstream in the production line. To ensure sufficient temperature stability in all parts of the furnace, the bottleneck water tank was raised by 1mm within 0.5 minutes. Simultaneously, the LPG natural gas flow rate in the cooling section was restored to its original value. After observation, the temperature variation in the flow channel was within the normal range, and the total time was 1 hour. Since the temperature variation in the flow channel is affected by the temperature variations in various parts, the temperature of the clarifier was measured at this time. It was found that the temperature of the clarifier had also decreased, reaching 1537.9℃. Considering that the most direct cause of the temperature variation in the clarifier is the heat output efficiency of the final furnace, the natural gas flow rate of the final furnace was adjusted to increase by 1% every 0.5 hours. At the same time, the bottleneck water jug ​​was restored to its original pressure depth. After one adjustment of the natural gas flow rate and 0.5 hours of observation, the temperature of the clarifier tended to normalize, and the flow channel temperature showed no significant fluctuations. Thus, the flow channel temperature was controlled, and the adjustment was completed.

Claims

1. A method for controlling the temperature of the flow channel in a MiniLED backplate glass melting furnace, characterized in that, When the flow channel temperature exceeds the normal temperature range, the adjustment method is as follows: S1 Flow channel sealing: Check if the flow channel is not sealed properly. If so, seal the flow channel. If not, check if the temperature of the cooling section is within the normal temperature range. S2 Cooling Section Temperature: If the cooling section temperature is within the normal temperature range, adjust the flow channel gate opening until the flow channel temperature returns to normal; if the cooling section temperature is not within the normal temperature range, adjust the LPG natural gas opening of the cooling section until the cooling section temperature returns to normal, and at the same time check whether the temperature at the bottleneck is within the normal temperature range. S3 Bottleneck Temperature: If the bottleneck temperature is within the normal temperature range, the adjustment ends; if the bottleneck temperature exceeds the normal temperature range, adjust the bottleneck water pressure depth until the bottleneck temperature returns to normal, and at the same time adjust the LPG natural gas opening of the cooling section to the original value, and check whether the temperature of the clarifier is within the normal temperature range. S4 Clarifying Section Temperature: If the clarifying section temperature is within the normal temperature range, the adjustment ends; if the clarifying section temperature exceeds the normal temperature range, adjust the opening of the natural gas injection gun at the end of the clarifying section to the small furnace until the clarifying section temperature returns to normal, and at the same time adjust the pressure depth of the bottleneck water tank to restore it to the original value.

2. The method for controlling the temperature of the flow channel in the Mini LED backplate glass melting furnace as described in claim 1, characterized in that, In step S2, the method for adjusting the opening of the flow channel gate is as follows: adjust the flow channel gate by 1 mm every 30 minutes.

3. The method for controlling the temperature of the flow channel in the Mini LED backplate glass melting furnace as described in claim 1, characterized in that, In step S2, the method for adjusting the LPG natural gas opening of the cooling section is as follows: adjust the opening by 1% every 30 minutes.

4. The method for controlling the temperature of the flow channel in the Mini LED backplate glass melting furnace as described in claim 1, characterized in that, In step S3, the method for adjusting the pressure depth of the neck-lock water bag is as follows: adjust the pressure depth of the neck-lock water bag by 1 mm every 30 minutes.

5. The method for controlling the temperature of the flow channel in the Mini LED backplate glass melting furnace as described in claim 1, characterized in that, In step S4, the method for adjusting the opening of the natural gas lance of the small furnace is as follows: adjust the opening by 1% every 30 minutes.

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