Automatic temperature control electric melting furnace

Abstract

The invention provides an automatic temperature control electric melting furnace which comprises a furnace body, a control unit, a heating device used for executing heating work and a fuel gas pipeline used for conveying combustible gas. The heating device penetrates through the gas pipeline so that combustible gas in the gas pipeline can be heated through the heating device, and the end, penetrating out of the heating device, of the gas pipeline is connected with the furnace body. A first temperature collector is arranged at the end, located at the heating device and away from the furnace body, of the gas pipeline, and the first temperature collector obtains the temperature of the combustible gas before the combustible gas enters the heating device. A second temperature collector is arranged at one end, penetrating out of the heating device, of the gas pipeline, so that the temperature of the combustible gas heated by the heating device is obtained by the second temperature collector; the control unit controls the heating device to work according to the temperature value of the first temperature collector so as to guarantee that the temperature value obtained by the second temperature collector reaches a threshold value, and then it is guaranteed that the temperature fluctuation in the furnace is always within the technological requirement range.

Description

Technical Field

[0001] The invention relates to the technical field of liquid crystal glass manufacturing, and in particular to a self-controlling temperature electric melting furnace. Background Art

[0002] In the production process of TFT-LCD liquid crystal glass substrates, hot-top electric melting furnaces are currently mainly used, which are heated by resistance heat and gas to ensure the melting efficiency of the electric melting furnace. In actual production, the furnace top temperature will fluctuate due to uncontrollable factors such as weather. In the production process, if the temperature fluctuation of the furnace top exceeds the process requirements, it will affect the production quality of the product and cause defective products. Through analysis, it is known that the main reason why weather changes affect the temperature fluctuation in the furnace is that the change in weather temperature will affect the temperature of the gas entering the furnace, which in turn causes the temperature fluctuation in the furnace. Summary of the invention

[0003] In order to solve the technical problems existing in the background technology, the present invention proposes a self-controlling temperature electric melting furnace.

[0004] The present invention provides a self-controlled temperature electric melting furnace, comprising: 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 passes through the heating device so that the heating device heats the combustible gas inside the gas pipeline, and one end of the gas pipeline passing through the heating device is connected to the furnace body;

[0006] A first temperature collector is provided at one end of the gas pipeline located at the heating device away from the furnace body, so that the temperature of the combustible gas before entering the heating device is obtained by the first temperature collector; a second temperature collector is provided at one end of the gas pipeline passing through the heating device, so that the temperature of the combustible gas after being heated by the heating device is obtained by the second temperature collector;

[0007] The control unit controls the operation of the heating device according to the temperature value of the first temperature collector to ensure that the temperature value acquired 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 to the furnace body.

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

[0010] Preferably, there is a distance between the area where the gas pipeline is located inside the preheating section and the inner wall of the preheating section to form a preheating chamber, the preheating chamber has a smoke inlet and a smoke exhaust port, and the smoke inlet of the preheating chamber is connected to the exhaust gas outlet of the furnace body through the smoke inlet pipeline.

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

[0012] Preferably, the heating device is provided with an insulation chamber outside its insulation section, and the gas pipeline is provided with a branch connected to the insulation chamber at the junction of the heating section and the insulation section.

[0013] Preferably, the heat preservation chamber is connected to a gas circuit, and the gas output by the gas circuit flows back into the gas pipeline as a part of the gas source of the gas pipeline.

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

[0015] Preferably, the outer cavity is provided with a plurality of circumferentially evenly distributed smoke inlets at its edge, and the tail gas of the furnace body is connected to each smoke inlet through a pipeline; the outer cavity is provided with a smoke exhaust port for exhausting smoke at its center.

[0016] Preferably, the inner space of the outer cavity is in a maze shape, each smoke inlet constitutes an entrance of the maze, and the smoke exhaust port constitutes an exit of the maze.

[0017] Preferably, a baffle is provided inside the outer clamping cavity between its smoke inlet and its smoke exhaust port.

[0018] In the present invention, a heating device passes through the gas pipeline so that the combustible gas inside the gas pipeline is heated by the heating device. A first temperature collector is arranged at one end of the gas pipeline so that the first temperature collector obtains the temperature of the combustible gas before entering the heating device. A second temperature collector is arranged at the other end of the gas pipeline so that the second temperature collector obtains the temperature of the combustible gas after being heated by the heating device. A control unit controls the operation of the heating device according to the temperature value of the first temperature collector so as 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, so that the temperature fluctuation in the furnace is always within the range of process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic structural diagram of a self-temperature-controlled electric melting furnace. DETAILED DESCRIPTION

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

[0021] 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. The end of the gas pipeline 3 passing through the heating device 2 is connected to the furnace body 1. A first temperature collector 4 is provided at the end of the gas pipeline 3 located at the heating device 2 away from the furnace body 1, so that the first temperature collector 4 can obtain the temperature of the combustible gas before entering the heating device 2; a second temperature collector 5 is provided at the end of the gas pipeline 3 passing through the heating device 2, so that the second temperature collector 5 can 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 collector 4 to ensure that the temperature value obtained by the second temperature collector 5 reaches the threshold value, so as to control the gas temperature output from the gas pipeline 3 through the heating device 2, the first temperature collector 4 and the second temperature collector 5, so as to ensure that the gas temperature input into the furnace body 1 by the gas pipeline 3 is constant, thereby avoiding the temperature fluctuation of the furnace body 1 caused by the temperature change of the gas itself, so that the temperature fluctuation in the furnace is always within the process requirement range.

[0022] The threshold in this embodiment may be an interval value or a fixed value.

[0023] Furthermore, in the present embodiment, the heating device 2 comprises 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 setting of 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 gas pipeline 3 in the heat preservation section can be used as a buffer space for the gas before entering the furnace body 1, so as to ensure that the temperature of the gas entering the furnace is constant, and avoid the temperature adjustment process of the heating section, where the gas is directly charged into the furnace body 1, causing temperature fluctuations in the furnace.

[0024] Furthermore, the heat source of the preheating section comes from the exhaust gas discharged from the furnace body 1. The specific structural design is as follows: there is a distance 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 smoke inlet and a smoke exhaust port. The smoke inlet of the preheating chamber is connected to the exhaust gas outlet of the furnace body 1 through the smoke inlet pipeline 11, so that the exhaust gas discharged from the furnace body 1 enters the preheating chamber, and then the heat of the exhaust gas discharged from the furnace body 1 is used to preheat the gas in the gas pipeline 3, thereby fully realizing the reuse of thermal energy and saving energy consumption.

[0025] The heat source of the heating section comes from the heating element 6 inside the heating device 2. The heating power of the heating element 6 is controlled by the control unit, and the control unit controls the power of the heating element 6 to achieve the control of the heating efficiency.

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

[0027] Furthermore, the insulation chamber 7 is connected to a gas circuit 9, and the gas output by the gas circuit 9 flows back into the gas pipeline 3 as a part of the gas source of the gas pipeline 3. In a specific design method, the output end of the gas circuit 9 can be connected to the gas pipeline 3, and the connecting part 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 the present embodiment, a cavity is provided inside the furnace top of the furnace body 1, and 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 pipeline so as to be discharged from the outer cavity 11. The outer cavity 11 can effectively isolate the interference of the temperature change of the external environment, while the inner cavity 10 can effectively prevent the loss of heat in the furnace.

[0029] Furthermore, the outer cavity 11 is provided with a plurality of smoke inlets evenly distributed in the circumferential direction at its edge, and the tail gas of the furnace body 1 is connected to each smoke inlet through a pipe; the outer cavity 11 is provided with a smoke exhaust port at its center for exhausting smoke. Since the temperature at the center of the top of the furnace body 1 is the highest compared to the periphery, the design of providing a plurality of smoke inlets around the outer cavity 11 and providing a smoke exhaust port at the center of the outer cavity 11 can ensure the uniformity of the temperature of each area in the cavity, thereby further enhancing the outer cavity 11 to isolate the external environment temperature from interfering with the temperature inside the furnace.

[0030] In this embodiment, the internal space of the outer chamber 11 is in a maze shape, each smoke inlet constitutes the entrance of the maze, and the smoke outlet constitutes the exit of the maze, so as to increase the residence time of the pressurized smoke in the outer chamber 11. Alternatively, a baffle is arranged inside the outer chamber 11 between the smoke inlet and the smoke outlet, so as to extend the residence time of the smoke in the outer chamber 11.

[0031] As can be seen from the above, in the present invention, the gas pipeline 3 is passed through by the heating device 2 so that the combustible gas inside the gas pipeline 3 is heated by the heating device 2. A first temperature collector 4 is arranged at one end of the gas pipeline 3 so that the first temperature collector 4 obtains the temperature of the combustible gas before entering the heating device 2. A second temperature collector 5 is arranged at the other end of the gas pipeline 3 so that the second temperature collector 5 obtains 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 collector 4 to ensure that the temperature value obtained by the second temperature collector 5 reaches the threshold value, so as to ensure that the temperature of the gas entering the furnace is constant and avoid the temperature fluctuation of the furnace body 1 caused by the temperature change of the gas itself.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-controlled temperature electric melting furnace, characterized in that: include: A furnace body (1), a control unit, a heating device (2) for performing heating work, and a gas pipeline (3) for conveying combustible gas, wherein: The gas pipeline (3) passes through the heating device (2) so that the heating device (2) heats the combustible gas inside the gas pipeline (3), and one end of the gas pipeline (3) passing through the heating device (2) is connected to the furnace body (1); A first temperature collector (4) is provided at one end of the gas pipeline (3) located away from the furnace body (1) of the heating device (2), so that the first temperature collector (4) can obtain the temperature of the combustible gas before it enters the heating device (2); a second temperature collector (5) is provided at one end of the gas pipeline (3) passing through the heating device (2), so that the second temperature collector (5) can 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 collector (4) to ensure that the temperature value acquired by the second temperature collector (5) reaches a threshold value.

2. The self-controlled temperature electric melting furnace according to claim 1, characterized in that: The heating device (2) comprises a preheating section, a heating section and a heat preservation section, and 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).

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

4. The self-controlled temperature electric melting furnace according to claim 3, characterized in that: A gas pipeline (3) is located in an area inside the preheating section and has a distance from the inner wall of the preheating section to form a preheating chamber, the preheating chamber has a smoke inlet and a smoke exhaust port, and the smoke inlet of the preheating chamber is connected to the exhaust gas outlet of the furnace body (1) through a smoke inlet pipeline (11); Preferably, the heating power of the heating element (6) is controlled by a control unit.

5. The self-controlled temperature electric melting furnace according to claim 2, characterized in that: The heating device (2) is provided with a heat preservation chamber (7) outside its heat preservation section, and the gas pipeline (3) is provided with a branch (8) connected to the heat preservation chamber (7) at the junction of the heating section and the heat preservation section.

6. The self-controlled temperature electric melting furnace according to claim 5, characterized in that: The heat preservation chamber (7) is connected to a gas circuit (9), and the gas output by the gas circuit (9) flows back into the gas pipeline (3) as a part of the gas source of the gas pipeline (3).

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

8. The self-controlled temperature electric melting furnace according to claim 7, characterized in that: The outer cavity (11) is provided with a plurality of smoke inlets evenly distributed in the circumferential direction at its edge, and the tail gas of the furnace body (1) is connected to each smoke inlet through a pipeline; the outer cavity (11) is provided with a smoke exhaust port for exhausting smoke at its center.

9. The self-temperature-controlled electric melting furnace according to claim 8, characterized in that: The inner space of the outer clamping cavity (11) is in a maze shape, each smoke inlet constitutes an entrance of the maze, and the smoke exhaust port constitutes an exit of the maze.

10. The self-controlled temperature electric melting furnace according to claim 8, characterized in that: A baffle is provided inside the outer clamping cavity (11) between its smoke inlet and its smoke exhaust port.

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