Self-regulating electric melting furnace

Abstract

The self-temperature-control electric melting furnace comprises a furnace body, a control unit, a heating device for performing heating work and a gas pipeline for conveying combustible gas; the gas pipeline is passed through the heating device to heat the combustible gas inside the gas pipeline by the heating device, and the end of the gas pipeline passing out of the heating device is connected with the furnace body; the end of the gas pipeline away from the furnace body is provided with a first temperature collector to obtain the temperature of the combustible gas before entering the heating device; the end of the gas pipeline passing out of the heating device is provided with a second temperature collector to obtain the temperature of the combustible gas after being heated by the heating device; the control unit controls the working of the heating device according to the temperature value of the first temperature collector to ensure that the temperature value obtained by the second temperature collector reaches a threshold value, thereby ensuring that the temperature fluctuation in the furnace is always within the process requirement range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid crystal glass manufacturing, and particularly relates to a self-temperature-control electric furnace. BACKGROUND

[0002] In the production process of TFT-LCD liquid crystal glass substrates, a hot top electric furnace is currently mainly used to ensure the melting efficiency of the electric furnace through resistance heat and gas heat. In actual production, the temperature of the furnace top is affected by uncontrollable factors such as weather and fluctuates. In the production process, if the temperature of the furnace top fluctuates beyond the range required by the process, the production quality of the product will be affected, resulting in the generation of defective products. Through analysis, it is found that the main reason why weather changes affect the temperature fluctuation in the furnace is that the change of weather temperature affects the temperature of the gas entering the furnace, thereby causing the temperature fluctuation in the furnace. SUMMARY

[0003] In order to solve the technical problems in the background art, the present application provides a self-temperature-control electric furnace.

[0004] The self-temperature-control electric furnace provided by the present application comprises a furnace body, a control unit, a heating device for performing heating work, and a gas pipeline for conveying combustible gas, wherein:

[0005] The gas pipeline is passed through the heating device to heat the combustible gas inside the gas pipeline by the heating device, and the end of the gas pipeline passing out of the heating device is connected with the furnace body.

[0006] The end of the gas pipeline away from the furnace body is provided with a first temperature collector to obtain the temperature of the combustible gas before entering the heating device, and the end of the gas pipeline passing out of the heating device is provided with a second temperature collector to obtain the temperature of the combustible gas after being heated by the heating device.

[0007] The control unit controls the working of the heating device according to the temperature value of the first temperature collector to ensure that the temperature value obtained by the second temperature collector reaches a threshold value.

[0008] Preferably, the heating device comprises a preheating section, a heating section and a heat preservation section, and one end of the gas pipeline passes through the preheating section, the heating section and the heat preservation section in sequence and is connected with the furnace body.

[0009] Preferably, the heat source of the preheating section is derived from the tail gas discharged from the furnace body, and the heat source of the heating section is derived from the heating element inside the heating device.

[0010] Preferably, the gas pipeline has a spacing between the area inside the preheating section and the inner wall of the preheating section to form a preheating cavity, the preheating cavity has a smoke inlet and a smoke outlet, and the smoke inlet of the preheating cavity is connected with the tail gas outlet of the furnace body through a smoke inlet pipeline.

[0011] Preferably, the heating power of the heating element is controlled by the control unit.

[0012] Preferably, the heating device is provided with a heat preservation cavity outside the heat preservation section thereof, and the gas pipeline is provided with a branch connected with the heat preservation cavity at the position where the heating section and the heat preservation section meet.

[0013] Preferably, the heat preservation cavity is connected with a gas return circuit, and the gas output by the gas return circuit is returned to the gas pipeline as a part of the gas source of the gas pipeline.

[0014] Preferably, the furnace top of the furnace body is internally provided with a clamping cavity, the clamping cavity includes an inner clamping cavity and an outer clamping cavity located outside the inner clamping cavity, and the tail gas of the furnace body is introduced into the outer clamping cavity through a pipeline to be discharged from the outer clamping cavity.

[0015] Preferably, the outer clamping cavity is provided with a plurality of circumferentially distributed smoke inlets at the edge position thereof, and the tail gas of the furnace body is connected with each smoke inlet through a pipeline; and the outer clamping cavity is provided with a smoke outlet for discharging the smoke at the center position thereof.

[0016] Preferably, the inner space of the outer clamping cavity is in a labyrinth pattern, each smoke inlet constitutes an entrance of the labyrinth, and the smoke outlet constitutes an exit of the labyrinth.

[0017] Preferably, the inner space of the outer clamping cavity is provided with a baffle between the smoke inlets and the smoke outlet.

[0018] In the present application, the gas pipeline is passed through by the heating device to heat the combustible gas inside the gas pipeline by the heating device, a first temperature collector is arranged at one end of the gas pipeline to obtain the temperature of the combustible gas before entering the heating device by the first temperature collector, a second temperature collector is arranged at the other end of the gas pipeline to obtain the temperature of the combustible gas after being heated by the heating device by the second temperature collector, and the control unit controls the working of the heating device according to the temperature value of the first temperature collector to ensure that the temperature value obtained by the second temperature collector reaches a threshold value, so as to ensure that the temperature of the gas entering the furnace is constant, avoid the temperature fluctuation of the furnace body caused by the temperature change of the gas itself, and make the temperature fluctuation in the furnace always within the process requirement range. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structure diagram of a self-control temperature electric melting furnace is provided in the present application. DETAILED DESCRIPTION

[0020] REFERENCE Figure 1The present invention proposes a self-temperature controlled electric melting furnace, comprising: a furnace body 1, a control unit, a heating device 2 for performing heating operations, and a gas pipeline 3 for conveying combustible gas, wherein:

[0021] A gas pipeline 3 passes through a heating device 2 to heat the combustible gas inside the gas pipeline 3. One end of the gas pipeline 3 exiting the heating device 2 is connected to the furnace body 1. A first temperature sensor 4 is installed at the end of the gas pipeline 3 away from the heating device 2 to obtain the temperature of the combustible gas before it enters the heating device 2. A second temperature sensor 5 is installed at the end of the gas pipeline 3 exiting the heating device 2 to obtain the temperature of the combustible gas after it has been heated by the heating device 2. The control unit controls the operation of the heating device 2 based on the temperature value from the first temperature sensor 4 to ensure that the temperature value obtained by the second temperature sensor 5 reaches a threshold. By coordinating the heating device 2, the first temperature sensor 4, and the second temperature sensor 5, the control unit controls the gas temperature output from the gas pipeline 3 to ensure a constant gas temperature entering the furnace body 1. This avoids temperature fluctuations in the furnace body 1 caused by changes in the gas's own temperature, ensuring that the temperature fluctuations inside the furnace remain within the required process range.

[0022] In this embodiment, the threshold can be an interval value or a fixed value.

[0023] Furthermore, in this embodiment, the heating device 2 includes a preheating section, a heating section, and a heat preservation section. One end of the gas pipeline 3 passes through the preheating section, the heating section, and the heat preservation section in sequence and is connected to the furnace body 1. The heat preservation section allows the gas temperature in the gas pipeline 3 to gradually enter a stable state, thereby ensuring that the temperature collected by the second temperature collector 5 is more accurate. At the same time, the part of the gas pipeline 3 in the heat preservation section can serve as a buffer space for the gas before it enters the furnace body 1, so as to ensure that the gas temperature entering the furnace is constant and to avoid the gas directly entering the furnace body 1 during the temperature adjustment process of the heating section, which would cause temperature fluctuations in the furnace.

[0024] Furthermore, the heat source for the preheating section comes from the exhaust gas emitted by the furnace body 1. The specific structural design is as follows: there is a gap between the area where the gas pipeline 3 is located inside the preheating section and the inner wall of the preheating section to form a preheating chamber. The preheating chamber has a flue gas inlet and a flue gas outlet. The flue gas inlet of the preheating chamber is connected to the exhaust gas outlet of the furnace body 1 through the flue gas inlet pipe, so that the exhaust gas emitted by the furnace body 1 enters the preheating chamber. Then, the heat of the exhaust gas emitted by the furnace body 1 is used to preheat the gas in the gas pipeline 3, so as to fully realize the reuse of thermal energy and save energy consumption.

[0025] The heat source for the heating section originates from the heating element 6 inside the heating device 2. The heating power of the heating element 6 is controlled by the control unit, which controls the heating efficiency by controlling the power of the heating element 6.

[0026] In addition, the heating device 2 is provided with an insulation cavity 7 outside its insulation section. The gas pipeline 3 is provided with a branch 8 connected to the insulation cavity 7 at the junction of the heating section and the insulation section. Part of the gas heated by the heating section enters the insulation section through the gas pipeline 3, while another part enters the insulation cavity 7 through the branch 8. Since the insulation gas in the insulation cavity 7 and the gas entering the insulation section are from the same source, heat exchange between the two can be prevented, thereby effectively enhancing the insulation effect and ensuring the stability of the gas temperature inside the insulation section.

[0027] Furthermore, the insulation cavity 7 is connected to a gas circuit 9. The gas output from the gas circuit 9 is returned to the gas pipeline 3 as part of the gas source. Specifically, the output end of the gas circuit 9 can be connected to the gas pipeline 3, and the connection point can be located before the gas pipeline 3 enters the heating device 2; or the output end of the gas circuit 9 can be directly connected to the gas source of the gas pipeline 3.

[0028] In addition, in this embodiment, the furnace top of the furnace body 1 is provided with a clamping cavity, which includes an inner clamping cavity 10 and an outer clamping cavity 11 located outside the inner clamping cavity 10. The exhaust gas of the furnace body 1 is introduced into the outer clamping cavity 11 through a pipe and discharged from the outer clamping cavity 11. The outer clamping cavity 11 can effectively isolate the interference of changes in the external ambient temperature, while the inner clamping cavity 10 can effectively block the loss of heat inside the furnace.

[0029] Furthermore, the outer cavity 11 has several circumferentially distributed flue gas inlets at its edge, and the exhaust gas from the furnace body 1 is connected to each flue gas inlet through pipes; the outer cavity 11 has a flue gas exhaust outlet at its center. Since the temperature is highest at the center of the top of the furnace body 1 compared to the periphery, the design of setting multiple flue gas inlets around the outer cavity 11 and setting a flue gas exhaust outlet at the center of the outer cavity 11 can ensure the temperature uniformity of various areas within the cavity, thereby further enhancing the outer cavity 11's ability to isolate the furnace temperature from the interference of the external ambient temperature.

[0030] In this embodiment, the internal space of the outer clamping cavity 11 is maze-shaped, with each smoke inlet forming the entrance of the maze and the smoke exhaust forming the exit of the maze, thereby increasing the residence time of the pressurized flue gas in the outer clamping cavity 11. Alternatively, a baffle plate can be installed inside the outer clamping cavity 11 between its smoke inlets and exhaust outlets to extend the residence time of the flue gas in the outer clamping cavity 11.

[0031] As can be seen from the above, in this invention, the gas pipeline 3 passes through the heating device 2 so that the combustible gas inside the gas pipeline 3 is heated by the heating device 2. A first temperature sensor 4 is provided at one end of the gas pipeline 3 so as to obtain the temperature of the combustible gas before entering the heating device 2. A second temperature sensor 5 is provided at the other end of the gas pipeline 3 so as to obtain the temperature of the combustible gas after being heated by the heating device 2. The control unit controls the operation of the heating device 2 according to the temperature value of the first temperature sensor 4 so as to ensure that the temperature value obtained by the second temperature sensor 5 reaches the threshold, thereby ensuring that the temperature of the gas entering the furnace is constant and avoiding temperature fluctuations in the furnace body 1 caused by changes in the temperature of the gas itself.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A self-temperature controlled electric melting furnace, characterized in that, include: The furnace body (1), the control unit, the heating device (2) for performing the heating operation, and the gas pipeline (3) for conveying combustible gas, wherein: The gas pipeline (3) passes through the heating device (2) to heat the combustible gas inside the gas pipeline (3). One end of the gas pipeline (3) that passes through the heating device (2) is connected to the furnace body (1). Specifically, the heating device (2) includes a preheating section, a heating section and a heat preservation section. One end of the gas pipeline (3) passes through the preheating section, the heating section and the heat preservation section in sequence and is connected to the furnace body (1). A first temperature collector (4) is provided at the end of the gas pipeline (3) located away from the furnace body (1) of the heating device (2) to obtain the temperature of the combustible gas before it enters the heating device (2); a second temperature collector (5) is provided at the end of the gas pipeline (3) that passes through the heating device (2) to obtain the temperature of the combustible gas after it has been heated by the heating device (2); The control unit controls the heating device (2) to work based on the temperature value of the first temperature collector (4) so ​​as to ensure that the temperature value obtained by the second temperature collector (5) reaches the threshold.

2. The self-temperature controlled electric melting furnace according to claim 1, characterized in that, The heat source of the preheating section comes from the exhaust gas emitted by the furnace body (1), and the heat source of the heating section comes from the heating element (6) inside the heating device (2).

3. The self-temperature controlled electric melting furnace according to claim 2, characterized in that, The gas pipeline (3) has a gap between the area inside the preheating section and the inner wall of the preheating section to form a preheating cavity. The preheating cavity has a flue gas inlet and a flue gas outlet. The flue gas inlet of the preheating cavity is connected to the exhaust gas outlet of the furnace body (1) through the flue gas inlet pipeline.

4. The self-temperature controlled electric melting furnace according to claim 3, characterized in that, The heating power of the heating element (6) is controlled by the control unit.

5. The self-temperature controlled electric melting furnace according to claim 1, characterized in that, The heating device (2) has an insulation cavity (7) located outside its insulation section, and the gas pipeline (3) has a branch (8) connected to the insulation cavity (7) located at the junction of the heating section and the insulation section.

6. The self-temperature controlled electric melting furnace according to claim 5, characterized in that, The insulation cavity (7) is connected to the gas circuit (9), and the gas output from the gas circuit (9) is returned to the gas pipeline (3) as part of the gas source.

7. The self-temperature controlled electric melting furnace according to claim 1, characterized in that, The furnace body (1) has a cavity inside the furnace top. The cavity includes an inner cavity (10) and an outer cavity (11) located outside the inner cavity (10). The exhaust gas of the furnace body (1) is introduced into the outer cavity (11) through a pipe and discharged from the outer cavity (11).

8. The self-temperature controlled electric melting furnace according to claim 7, characterized in that, The outer cavity (11) has several circumferentially distributed smoke inlets at its edge, and the exhaust gas of the furnace body (1) is connected to each smoke inlet through pipes; the outer cavity (11) has a smoke exhaust port at its center for the exhaust of flue gas.

9. A self-temperature controlled electric melting furnace according to claim 8, characterized in that, The internal space of the outer cavity (11) is maze-shaped, with each smoke inlet forming the entrance of the maze and the smoke exhaust outlet forming the exit of the maze.

10. A self-temperature controlled electric melting furnace according to claim 8, characterized in that, The outer cavity (11) has a baffle plate located between its smoke inlet and its smoke outlet.

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