Operation method of replaceable glass melting furnace discharge pipe

Abstract

Disclosed is an operation method for a replaceable discharge pipe of a glass melting furnace. In the method, a glass melting pool accommodates molten glass liquid, and a first channel for discharging the glass liquid is provided at the bottom. A first through hole aligned with the first channel is provided on the bottom support plate of the furnace. A cooling channel for cooling is provided at the top of the lower discharge pipe. The lower discharge pipe is emptied, a cooling medium is introduced into the cooling channel, and the lower coil is started by the second power supply to heat the lower discharge pipe; the upper coil is closed and the cooling medium is continuously introduced into the cooling channel, and the power of the second power supply for supplying power to the lower coil is reduced. The glass liquid in the discharge channel solidifies and vitrifies. After the glass stops flowing out, the second power supply is turned off. When the liquidus temperature T of the molten glass L minus the temperature T1 of the upper discharge pipe is not lower than 350 - 500 °C, the cooling channel is closed. The operation method for the replaceable discharge pipe of the glass melting furnace significantly improves the operation safety of discharging and the discharge pipe can be replaced.

Description

Technical Field

[0001] The invention relates to the technical field of glass furnace melting, and in particular to an operating method of a replaceable glass furnace discharge pipe. Background Art

[0002] The molten glass obtained by melting in a glass melting furnace needs to be discharged from the furnace in some way. One of the ways is the freeze-thaw method of bottom discharging, that is, installing a discharging device at the bottom of the furnace. When discharging is not needed, the discharging port is set to a lower temperature, and the internal molten glass is "frozen"; when discharging is needed, the discharging port is heated to melt the internal glass, and the molten glass in the furnace can be discharged. This method has the function of a discharging valve, so it is also called freeze-thaw valve discharging. The freeze-thaw valve has the advantages of simple operation and the molten glass is not easy to overflow.

[0003] The German VEK glass solidification furnace uses a freeze-thaw valve-type bottom discharge device. The discharge pipe is installed at the bottom of the furnace, and its upper part is pre-buried inside the furnace refractory material. The lower tubular structure is exposed outside the furnace. The discharge pipe is heated by a medium-frequency induction coil. The existing technology assumes that the life of the discharge pipe is long enough, but does not consider the maintainability and replaceability of the discharge pipe. During the use of the project, the discharge pipe may be damaged due to corrosion, material defects, high-temperature fatigue and other factors. Since there is a large amount of high-temperature glass liquid inside the furnace, and the furnace may also be in a harsh environment such as radioactivity, the existing technology cannot achieve safe operation and replacement of the discharge pipe.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0005] The object of the present invention is to provide an operating method for a replaceable discharge pipe of a glass melting furnace, so as to solve the problems of safe operation and replacement of the discharge pipe at the bottom of an existing glass melting furnace, especially a glass solidification melting furnace.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An operating method of a replaceable glass melting furnace discharge pipe of the present invention comprises:

[0008] The discharge pipe at the bottom of the furnace is divided into an upper discharge pipe and a lower discharge pipe. The glass melting pool is installed on the bottom support plate of the furnace. The glass melting pool contains molten glass liquid and is provided with a first channel for leading out the glass liquid at the bottom. The bottom support plate of the furnace is provided with a first through hole aligned with the first channel. The upper discharge pipe is sealedly sleeved on the first channel and the first through hole. An insulating medium layer is provided between the discharge pipe and the glass melting pool. The insulating medium layer is pre-buried with an upper coil for heating. The upper coil is powered by a first power supply. The lower discharge pipe is detachably connected to the bottom end of the upper discharge pipe and the upper discharge pipe and the lower discharge pipe constitute a discharge channel. The lower coil is detachably sleeved on the lower discharge pipe to heat the lower discharge pipe. The lower coil is powered by a second power supply. A cooling channel for cooling is provided on the top of the lower discharge pipe.

[0009] Empty the lower discharge pipe, turn off the first power supply and keep the cooling medium flowing into the cooling channel, power on the second power supply to start the lower coil, heat the lower discharge pipe, melt the glass inside the lower discharge pipe and then flow out, and empty the remaining glass inside the lower discharge pipe;

[0010] Keep the first power supply of the upper coil closed and keep the cooling medium flowing into the cooling channel, reduce the power of the second power supply of the lower coil, the glass liquid in the discharge channel solidifies and vitrifies, and after the glass stops flowing out, the lower discharge pipe cools down, turns off the second power supply, and closes the cooling channel.

[0011] Remove the lower coil from the lower discharge pipe, install a detachable induction coil at the connection between the upper discharge pipe and the lower discharge pipe, start the third power supply to power the detachable induction coil, heat the top of the lower discharge pipe,

[0012] Remove the lower discharge pipe from the upper discharge pipe, turn off the third power supply, remove the induction coil, install a new lower discharge pipe on the upper discharge pipe, and detachably install the lower coil on the new lower discharge pipe.

[0013] In the method for operating a replaceable discharge pipe of a glass melting furnace, when replacing the lower discharge pipe, the lower discharge pipe is emptied, the first power supply powered by the upper coil is turned off, a cooling medium is introduced into the cooling channel, and the second power supply powered by the lower coil is started to heat the lower discharge pipe, so that the temperature of the lower discharge pipe T2 minus the liquidus temperature T L At 50-260℃, empty the remaining glass in the lower discharge pipe. After the glass stops flowing out, turn off the second power supply, remove the lower coil from the lower discharge pipe, and removably install the induction coil at the bottom of the upper discharge pipe. When the liquidus temperature of the molten glass is T L Subtract the upper discharge pipe temperature T1 greater than 400-600℃, close the cooling channel, start the third power supply to power the induction coil, and when the lower discharge pipe temperature T2 is greater than the liquidus temperature T L, remove the lower discharge pipe from the upper discharge pipe, turn off the third power supply, remove the induction coil, install a new lower discharge pipe on the upper discharge pipe, and detachably install the lower coil on the new lower discharge pipe.

[0014] In the operating method of a replaceable glass melting furnace discharge pipe, the top of the lower discharge pipe is a groove structure, the bottom end of the upper discharge pipe is sealed and accommodated in the groove structure, and the lower discharge pipe and the upper discharge pipe are coaxially connected.

[0015] In the operating method of a replaceable glass melting furnace discharge pipe, the lower discharge pipe includes a vertical tube body with a diameter R and an upper interface at the top of the vertical tube body, the groove structure is recessed in the upper interface, and the diameter R and the upper interface height d have the following relationship: R: d = 0.4-0.8.

[0016] In the operating method of the replaceable glass melting furnace discharge pipe, the cooling medium includes compressed air, liquid nitrogen or circulating water.

[0017] In the operating method of the replaceable glass melting furnace discharge pipe, the first power supply is a high-frequency power supply, and the operating frequency is between 10kHz and 5.5MHz.

[0018] In the operating method of the replaceable glass melting furnace discharge pipe, the operating frequency of the second power supply is between 500 Hz and 30 kHz.

[0019] In the operating method of the replaceable glass melting furnace discharge pipe, the operating frequency of the third power supply is between 1 kHz and 50 kHz.

[0020] In the operating method of a replaceable glass melting furnace discharge pipe, a non-contact infrared thermometer is installed at the bottom of the melting furnace to monitor the surface temperature of the upper discharge pipe and the lower discharge pipe in real time.

[0021] In the method for operating a replaceable glass melting furnace discharge pipe, the top of the lower discharge pipe is provided with an inner hollow cooling channel, and the cooling channel includes a cooling medium inlet and a cooling medium outlet for introducing the cooling medium.

[0022] In the above technical scheme, the present invention provides an operating method for a replaceable glass melting furnace discharge pipe, which has the following beneficial effects: Compared with the prior art, the glass melting furnace discharge pipe is easily damaged in high temperature, corrosive environment and the like. The replaceable glass melting furnace discharge pipe of the present invention can be replaced, and can effectively prevent glass liquid leakage in the furnace during use and replacement. At the same time, the pre-buried induction coil can directly heat the part of the discharge pipe inside the furnace body, which can avoid furnace blockage and discharge failure. The present invention solves the problem that the discharge pipe at the bottom of the glass melting furnace, especially the radioactive waste glass solidification furnace, cannot be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A schematic diagram of the installation arrangement of an operating method for a replaceable glass melting furnace discharge pipe provided in an embodiment of the present invention.

[0025] Figure 2 A schematic diagram of the replacement of an operating method of a replaceable glass melting furnace discharge pipe provided in an embodiment of the present invention.

[0026] Figure 3 A schematic diagram of the dimensions of a lower discharge pipe of an operating method for a replaceable glass melting furnace discharge pipe provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be understood that the terms center, longitudinal, lateral, length, width, thickness, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms first and second are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as first and second may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of multiple is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms such as installation, connection, connection, fixing, etc. should be understood in a broad sense, for example, it can be fixed connection, detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] See also Figure 1-3 As shown, in one embodiment, a method for operating a replaceable glass melting furnace discharge pipe of the present invention includes:

[0036] A glass melting pool 8 is installed on a furnace bottom support plate 10, the glass melting pool 8 contains molten glass liquid 9 and is provided with a first channel for leading out the glass liquid 9 at the bottom, the furnace bottom support plate 10 is provided with a first through hole aligned with the first channel, an upper discharge pipe 1 is sealedly sleeved on the first channel and the first through hole, an insulating medium layer 11 is provided between the discharge pipe and the glass melting pool 8, an upper coil 3 for heating is embedded in the insulating medium layer 11, the upper coil 3 is powered by a first power supply, a lower discharge pipe 2 is detachably connected to the bottom end of the upper discharge pipe 1, and the upper discharge pipe 1 and the lower discharge pipe 2 constitute a discharge channel, a lower coil 4 is detachably sleeved on the lower discharge pipe 2 to heat the lower discharge pipe 2, the lower coil 4 is powered by a second power supply, and a cooling channel 5 for cooling is provided on the top of the lower discharge pipe 2;

[0037] The lower discharge pipe 2 is emptied, and the cooling medium is introduced into the cooling channel 5. The second power supply starts the lower coil 4 to heat the lower discharge pipe 2 so that the lower discharge pipe temperature T2 minus the liquidus temperature T of the molten glass is L The temperature is between 50 and 260 ° C, and the remaining glass in the lower discharge pipe 2 is emptied; the first power supply starts the upper coil 3 to heat the upper discharge pipe 1, so that the temperature of the lower discharge pipe T1 minus the liquidus temperature of the molten glass T L At 50-300° C., the glass inside the upper discharge pipe 1 is melted by the heat and flows out, and the glass liquid 9 inside the glass melting pool 8 flows out accordingly; precise temperature control improves the passability of the discharge.

[0038] Close the upper coil 3 and keep the cooling medium flowing into the cooling channel 5, reduce the power of the second power supply of the lower coil 4, and the glass liquid 9 in the discharge channel solidifies and vitrifies. After the glass stops flowing out, turn off the second power supply. When the liquidus temperature T L Subtract the upper discharge pipe temperature T1 not less than 350-500°C, and close the cooling channel 5. The segmented discharge operation is beneficial to the passability and safety of the discharge.

[0039] In a preferred embodiment of the method for operating a replaceable glass melting furnace discharge pipe, when replacing the lower discharge pipe 2, the lower discharge pipe 2 is emptied, the first power supply powered by the upper coil 3 is turned off, a cooling medium is introduced into the cooling channel 5, and the second power supply powered by the lower coil 4 is started to heat the lower discharge pipe 2, so that the temperature of the lower discharge pipe T2 minus the liquidus temperature T of the molten glass is L At 50-260℃, empty the remaining glass in the lower discharge pipe 2. After the glass stops flowing out, turn off the second power supply, remove the lower coil 4 from the lower discharge pipe 2, and detachably install the induction coil 12 at the bottom of the upper discharge pipe 1. When the liquidus temperature of the molten glass is T L Subtract the upper discharge pipe temperature T1 greater than 400-600°C, close the cooling channel 5, start the third power supply to power the induction coil 12, and when the lower discharge pipe 2 temperature T2 is greater than the liquidus temperature T L , remove the lower discharge pipe 2 from the upper discharge pipe 1, turn off the third power supply, remove the induction coil 12, install a new lower discharge pipe 2 on the upper discharge pipe 1, and detachably install the lower coil 4 on the new lower discharge pipe 2.

[0040] In a preferred embodiment of the operating method of a replaceable glass melting furnace discharge pipe, the top of the lower discharge pipe 2 is a groove structure, the bottom end of the upper discharge pipe 1 is sealed and accommodated in the groove structure, and the lower discharge pipe 2 is coaxially connected to the upper discharge pipe 1.

[0041] In a preferred embodiment of the operating method of a replaceable glass melting furnace discharge pipe, the lower discharge pipe 2 includes a vertical tube body with a diameter R and an upper interface at the top of the vertical tube body, the groove structure is recessed in the upper interface, and the diameter R and the upper interface height d have the following relationship: R: d = 0.4-0.8.

[0042] In a preferred embodiment of the method for operating a replaceable glass melting furnace discharge pipe, the cooling medium includes compressed air, liquid nitrogen or circulating water.

[0043] In a preferred embodiment of the operating method of a replaceable glass melting furnace discharge pipe, the first power supply is a high-frequency power supply, and the operating frequency is between 10kHz and 5.5MHz, the operating frequency of the second power supply is between 500Hz and 30kHz, and the operating frequency of the third power supply is between 1kHz and 50kHz.

[0044] In a preferred embodiment of the method for operating a replaceable discharge pipe of a glass melting furnace, a non-contact infrared thermometer is installed at the bottom of the melting furnace to monitor the surface temperature of the upper discharge pipe 1 and the lower discharge pipe 2 in real time.

[0045] In a preferred embodiment of the method for operating a replaceable glass melting furnace discharge pipe, a top of the lower discharge pipe 2 is provided with an inner hollow cooling channel 5, and the cooling channel 5 includes a cooling medium inlet 6 and a cooling medium outlet 7 for introducing the cooling medium.

[0046] In a preferred embodiment of the method for operating a replaceable discharge pipe of a glass melting furnace, the upper discharge pipe 1 comprises an upper disc-shaped structure directly supported on the glass melting pool 8, a cylinder connected to the upper disc-shaped structure, and a lower disc-shaped structure connected to the cylinder, wherein the lower disc-shaped structure abuts against the bottom surface of the furnace bottom support plate 10. The top of the discharge pipe is pre-buried inside the furnace bottom, the upper disc-shaped structure is directly supported on the glass melting pool and the upper part of the discharge pipe is directly heated by the upper coil, the temperature of the entire discharge pipe is uniform and controllable, avoiding the risk of too low or too high temperature, when the furnace is ready to discharge, the temperature of the glass inside the furnace bottom buffer section is relatively low and in a solid state, the upper part of the discharge pipe is directly heated by the upper coil to accurately control the time when the glass liquid starts to flow out, avoiding the crystallization of the glass, and the problem of being unable to discharge due to a higher solid-liquid transition temperature; when the furnace is ready to stop discharging, due to the slow temperature drop of the furnace bottom buffer section, the cooling medium is introduced through the lower discharge pipe 2 to quickly and accurately solidify the glass liquid inside the discharge channel, avoiding the risk of being unable to stop discharging.

[0047] In a preferred embodiment of the method for operating a replaceable glass melting furnace discharge pipe, the diameter of the lower disc-shaped size is smaller than the diameter of the upper disc-shaped size. The arrangement of the upper discharge pipe 1 and the lower discharge pipe 2 of the present invention is conducive to improving the service life and operation safety of the melting furnace, especially the upper disc-shaped structure and the lower disc-shaped structure wrap the first channel of the glass melting pool 8, and wrap the bottom support plate 10 of the melting furnace to improve the sealing and durability.

[0048] In one embodiment, the upper discharge pipe 1 is fixedly installed at the bottom of the furnace, and the lower discharge pipe 2 is detachable, and the top is a groove structure, which serves as an interface with the upper discharge pipe 1. The lower discharge pipe 2 is coaxially connected to the upper discharge pipe 1, and is connected and fastened with bolts. The center of the discharge pipe is a glass liquid discharge channel. The upper coil 3 is used to heat the upper discharge pipe 1 and is powered by a first power supply. The lower coil 4 is used to heat the lower discharge pipe 2 and is powered by a second power supply. There is an inner hollow cooling channel 5 at the top of the lower discharge pipe 2, and the cooling medium is introduced through the cooling medium inlet 6 and the cooling medium outlet 7. The cooling medium can be selected from compressed air, liquid nitrogen or circulating water. The glass melting pool 8 is built of refractory materials, and the interior is molten glass liquid 9. The glass melting pool 8 is installed on the support plate 10 at the bottom of the furnace.

[0049] In one embodiment, the upper coil 3 is pre-buried in the insulating medium layer 11, which has the property of electrical insulation and can withstand the high temperature of the discharge pipe. The induction coil 12 is installed when the lower discharge pipe is replaced, and is sleeved on the outside of the connection between the upper and lower discharge pipes, and is powered by a third power supply. The first power supply used by the upper coil 3 is a high-frequency power supply, and the operating frequency is between 10kHz and 5.5MHz. The operating frequency of the second power supply used by the lower coil 4 is between 500Hz and 30k Hz. The operating frequency of the third power supply used by the induction coil 12 is between 1kHz and 50kHz. A non-contact infrared thermometer is installed at the bottom of the furnace to monitor the surface temperature of the upper discharge pipe 1 and the lower discharge pipe 2 in real time. The diameter R of the main body of the lower discharge pipe 2 and the height d of the upper interface have the following relationship: R: d = 0.4-0.8.

[0050] In one embodiment, in the method of operation,

[0051] Start the unloading process:

[0052] Empty the lower discharge pipe 2: Introduce cooling medium into the cooling channel 5, start the second power supply of the lower coil 4, set the power between 4kW and 50kW, and slowly heat the lower discharge pipe 2. Adjust the power of the second power supply so that the temperature of the lower discharge pipe 2 is T2-the liquidus temperature of the molten glass T L =50-260℃, empty the remaining glass inside the lower discharge pipe.

[0053] Heating the upper discharge pipe 1: Start the first power supply of the upper coil 3, the power is set between 3kW and 40kW, slowly heat the upper discharge pipe 1, and adjust the power of the first power supply so that the temperature of the upper discharge pipe 1 T1-the liquidus temperature T of the molten glass L >50-300℃.

[0054] Discharging: The glass inside the upper discharging pipe 1 is heated and melted and then slowly flows out, and the glass liquid 9 inside the glass melting pool 8 flows out accordingly.

[0055] Stop the discharging process:

[0056] Cooling the upper part: Turn off the first power supply of the upper coil 3, and keep the cooling medium flowing into the cooling channel 5. Reduce the power of the second power supply of the lower coil 4, and set it between 5kW and 20kW. The temperature of the upper discharge pipe 1 and the lower discharge pipe 2 gradually decreases, and the glass liquid in the discharge channel slowly solidifies and vitrifies.

[0057] Lower cooling: After the glass stops flowing out, turn off the second power supply.

[0058] Turn off the cooling medium: When the liquidus temperature of the molten glass is T L - When the upper discharge pipe temperature T1>350-500℃, the cooling medium in channel 5 is closed.

[0059] Replacement of the discharge pipe process:

[0060] Empty the lower discharge pipe 2: Turn off the first power supply of the upper coil 3, and introduce cooling medium into the cooling channel 5. Start the second power supply of the lower coil 4, set the power between 4kW and 50kW, and slowly heat the lower discharge pipe 2. Adjust the power of the second power supply so that the temperature of the lower discharge pipe T2-the liquidus temperature of the molten glass T L =50-260℃, empty the remaining glass inside the lower discharge pipe.

[0061] Lower cooling: After the glass stops flowing out, turn off the second power supply.

[0062] Remove the lower coil 4 and remove the bolts used to connect the lower discharge pipe 2 and the upper discharge pipe 1.

[0063] Heating interface: Install the induction coil 12, when the liquidus temperature of the molten glass is T L - When the upper discharge pipe temperature T1>400-600°C, the cooling medium in the channel 5 is turned off. The third power supply is started to supply power to the induction coil 12, and the power is set to not less than 20kW. When the lower discharge pipe temperature T1>the liquidus temperature T L , remove the discharge pipe 2. Turn off the third power supply,

[0064] Replacement: Remove the induction coil 12, install a new lower discharge pipe 2 and tighten it with bolts, and install the lower coil 4.

[0065] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0066] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for operating a replaceable glass melting furnace discharge pipe, characterized in that: It includes the following steps: The discharge pipe at the bottom of the furnace is divided into an upper discharge pipe and a lower discharge pipe. The glass melting pool is installed on the bottom support plate of the furnace. The glass melting pool contains molten glass liquid and is provided with a first channel for leading out the glass liquid at the bottom. The bottom support plate of the furnace is provided with a first through hole aligned with the first channel. The upper discharge pipe is sealedly sleeved on the first channel and the first through hole. An insulating medium layer is provided between the upper discharge pipe and the glass melting pool. The insulating medium layer is pre-buried with an upper coil for heating. The upper coil is powered by a first power supply. The lower discharge pipe is detachably connected to the bottom end of the upper discharge pipe and the upper discharge pipe and the lower discharge pipe constitute a discharge channel. The lower coil is detachably sleeved on the lower discharge pipe to heat the lower discharge pipe. The lower coil is powered by a second power supply. A cooling channel for cooling is provided on the top of the lower discharge pipe. Empty the lower discharge pipe, turn off the first power supply and keep the cooling medium flowing into the cooling channel, power on the second power supply to start the lower coil, heat the lower discharge pipe, melt the glass inside the lower discharge pipe and then flow out, and empty the remaining glass inside the lower discharge pipe; Keep the first power supply of the upper coil off and keep the cooling medium flowing into the cooling channel, reduce the power of the second power supply of the lower coil, the glass liquid in the discharge channel solidifies and vitrifies, and after the glass stops flowing out, the lower discharge pipe cools down, the second power supply is turned off, and the cooling channel is closed. Remove the lower coil from the lower discharge pipe, install a detachable induction coil at the connection between the upper discharge pipe and the lower discharge pipe, start the third power supply to power the detachable induction coil, heat the top of the lower discharge pipe, Remove the lower discharge pipe from the upper discharge pipe, turn off the third power supply, disassemble the induction coil, install a new lower discharge pipe on the upper discharge pipe, and detachably install the lower coil on the new lower discharge pipe. When replacing the lower discharge pipe, empty the lower discharge pipe, turn off the first power supply powered by the upper coil, introduce cooling medium into the cooling channel, start the second power supply powered by the lower coil to heat the lower discharge pipe, so that the temperature of the lower discharge pipe is T2 minus the liquidus temperature T of the molten glass. L At 50-260℃, empty the remaining glass in the lower discharge pipe. After the glass stops flowing out, turn off the second power supply, remove the lower coil from the lower discharge pipe, and removably install the induction coil at the bottom of the upper discharge pipe. When the liquidus temperature of the molten glass is T L Subtract the upper discharge pipe temperature T1 greater than 400-600℃, close the cooling channel, start the third power supply to power the induction coil, and when the lower discharge pipe temperature T2 is greater than the liquidus temperature T L , remove the lower discharge pipe from the upper discharge pipe, turn off the third power supply, remove the induction coil, install a new lower discharge pipe on the upper discharge pipe, and detachably install the lower coil on the new lower discharge pipe. The upper discharge pipe includes an upper disc-shaped structure directly supported on the glass melting pool, a cylinder connected to the upper disc-shaped structure, and a lower disc-shaped structure connected to the cylinder. The lower disc-shaped structure abuts against the bottom surface of the furnace bottom support plate. The top of the upper discharge pipe is pre-buried inside the furnace bottom. The upper disc-shaped structure is directly supported on the glass melting pool and directly heats the upper part of the upper discharge pipe through the upper coil. The temperature of the entire upper discharge pipe is uniform and controllable.

2. The method for operating a replaceable glass melting furnace discharge pipe according to claim 1, characterized in that: The top of the lower discharge pipe is a groove structure, the bottom end of the upper discharge pipe is sealed and accommodated in the groove structure, and the lower discharge pipe is coaxially connected with the upper discharge pipe.

3. The method for operating a replaceable glass melting furnace discharge pipe according to claim 2, characterized in that: The lower discharge pipe includes a vertical tube body with a diameter of R and an upper interface at the top of the vertical tube body. The groove structure is recessed in the upper interface. The diameter R and the height d of the upper interface have the following relationship: R: d=0.4-0.

8.

4. The method for operating a replaceable glass melting furnace discharge pipe according to claim 1, characterized in that: Cooling media include compressed air, liquid nitrogen or circulating water.

5. The method for operating a replaceable glass melting furnace discharge pipe according to claim 1, characterized in that: The first power source is a high frequency power source, and the operating frequency is between 10kHz and 5.5MHz.

6. The method for operating a replaceable glass melting furnace discharge pipe according to claim 1, characterized in that: The operating frequency of the second power source is between 500 Hz and 30 kHz.

7. The method for operating a replaceable glass melting furnace discharge pipe according to claim 1, characterized in that: The operating frequency of the third power supply is between 1 kHz and 50 kHz.

8. The method for operating a replaceable glass melting furnace discharge pipe according to claim 1, characterized in that: A non-contact infrared thermometer is installed at the bottom of the furnace to monitor the surface temperature of the upper and lower discharge pipes in real time.

9. The method for operating a replaceable glass melting furnace discharge pipe according to claim 1, characterized in that: The top of the lower discharge pipe is provided with a cooling channel with a hollow interior, and the cooling channel includes a cooling medium inlet for introducing cooling medium and a cooling medium outlet.

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