Overflow discharging system

Abstract

The invention discloses an overflow discharging system which comprises a lifting channel connected with the furnace top of a smelting furnace; the lifting device is connected with the lifting channel, and the lifting device is used for lifting the radioactive glass molten mass in the smelting furnace into the lifting channel; the overflow channel comprises an overflow channel body and a discharge port formed in the overflow channel body, the overflow channel body is connected with the lifting channel, and the glass melt in the lifting channel overflows into the overflow channel; and the discharging device is connected with the discharging hole and is used for discharging the glass melt. The device has the beneficial effects that when the problems such as bottom discharging blockage caused by precious metal deposition occur in bottom discharging of the smelting furnace, the smelting furnace discharging operation is achieved, the using efficiency of the smelting furnace is improved, and the service life of the smelting furnace is prolonged; the liquid level of glass melt in the molten pool is relatively stable, the electrode parameter change is small, and the temperature schedule in the smelting furnace is stable; discharging is stable, and the risk of accidents such as barrel covering is reduced; by optimizing, improving and designing the overflow discharging system, continuous and stable discharging of the smelting furnace can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of radioactive liquid treatment, and in particular relates to an overflow discharge system. Background Art

[0002] Glass solidification treatment technology is a key technology for the harmless and stabilized treatment of radioactive waste. It uses high-temperature melting methods such as plasma and induction heating to mix harmful nuclides in radioactive waste with glass additives under high-temperature melting to form a glass melt that encapsulates the nuclides. After cooling, this glass melt forms a glass solid with high compressive strength, low nuclide leaching rate, and high stability. However, the radioactive waste glass melt discharge device currently used in the vitrification treatment of radioactive waste has difficulty in achieving stable discharge and rapid shutoff of the glass melt. The furnace may encounter a situation where the bottom discharge is unavailable. Due to uncontrollable factors such as glass crystallization, precious metal deposition, or the falling off of refractory bricks in the molten pool, the bottom discharge system may be blocked or the bottom electrode may be damaged, making it impossible to discharge the material. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an overflow discharge system in response to the above-mentioned deficiencies in the prior art, which can realize the smooth discharge of molten glass, avoid the problems of crystallization and precious metal deposition of the discharge at the bottom of the furnace, and prevent the problem of blockage of the bottom discharge.

[0004] The technical solution adopted to solve the technical problem of the present invention is to provide an overflow discharging system, comprising:

[0005] A lifting channel connected to the furnace roof;

[0006] a lifting device connected to the lifting channel, the lifting device being used to lift the radioactive glass melt in the furnace into the lifting channel;

[0007] The overflow channel includes an overflow channel body and a discharge port provided on the overflow channel body. The overflow channel body is connected to the lifting channel. The molten glass in the lifting channel overflows into the overflow channel.

[0008] The discharging device is connected to the discharging port and is used to discharge the molten glass.

[0009] The liquid in the lifting channel flows from bottom to top and overflows laterally into the overflow channel.

[0010] Preferably, the lifting device is a gas lifting assembly, and the lifting gas of the gas lifting assembly is air or nitrogen.

[0011] Preferably, the gas lifting assembly includes: a bubbling tube, a liquid level gauge, and a temperature detector. The bubbling tube is connected to the lifting channel and is used to blow gas into the lifting channel. The liquid level gauge is connected to the top of the furnace and the temperature detector is connected to the top of the furnace.

[0012] The bubbler tube is used to blow gas into the riser channel, and a temperature detector detects whether the temperature has reached the discharge temperature. The start and stop of glass discharge is based on the glass level in the furnace, which is detected by a level gauge. The gas lift assembly uses the principle of bubbling to lift the molten glass. When gas from the bubbler tube is injected into the overflow channel, the density of the glass liquid there is lower than that in the melt pool, causing the glass level in the riser channel to naturally rise.

[0013] Preferably, the gas lift assembly further comprises:

[0014] The first connecting part includes: a flange, a first sleeve, a second sleeve, and a third sleeve. The flange is connected to the top of the furnace. The first sleeve, the second sleeve, and the third sleeve are respectively arranged on the flange and pass through the flange. The first sleeve is arranged outside the bubbling tube, the second sleeve is arranged outside the liquid level gauge, and the third sleeve is arranged outside the temperature detector.

[0015] Preferably, the overflow discharging system further comprises:

[0016] The heating device is connected to the overflow channel and is used to heat the overflow channel.

[0017] Preferably, the heating device includes: a heating element and a conductive layer, the heating element is arranged outside the overflow channel, the conductive layer is arranged between the heating element and the outer wall of the overflow channel, and the heating element is used for heating.

[0018] The inner layer of the overflow channel is made of refractory ceramic bricks, and plate electrodes are provided on the outside of the ceramic bricks. The plate electrodes are three pairs of Inconel690 material plate electrodes. The ceramic bricks are secondary heated by the plate electrodes. At high temperatures, the ceramic bricks have high electrical conductivity and generate Joule heat that radiates to the overflow channel.

[0019] Preferably, the overflow channel is formed from refractory ceramic bricks.

[0020] Preferably, the overflow channel is made of a heat-insulating material.

[0021] Preferably, the overflow discharge system further comprises: a heat-insulating layer arranged outside the overflow channel, and the heat-insulating layer is used for heat preservation.

[0022] Preferably, the discharging device includes: a discharging pipe and an overflow discharging sleeve, the discharging pipe is connected to the discharging port, the overflow discharging sleeve is used to connect with the product container to form a closed discharging, the overflow discharging sleeve includes: an overflow discharging sleeve body, an overflow discharging channel arranged in the overflow discharging sleeve body, and an overflow lining pipe arranged in the overflow discharging channel, the overflow discharging sleeve body is connected to the discharging pipe, and the discharging end of the overflow lining pipe is a maze channel.

[0023] Preferably, the discharging device further comprises:

[0024] The second connecting piece is arranged between the overflow discharge sleeve and the discharge pipe, and the overflow discharge sleeve is connected to the discharge pipe through the second connecting piece.

[0025] Preferably, the overflow discharging system further comprises:

[0026] The observation hole is provided on the discharging device and is used to observe the discharging of the molten glass.

[0027] Preferably, the overflow channel is inclined downward, and the downward slope is 1 to 5 degrees.

[0028] Preferably, the overflow discharging system further comprises:

[0029] The exhaust channel is connected to the lifting channel, and the exhaust channel is used for exhausting air.

[0030] Preferably, the exhaust passage is also connected to the furnace, and the gas in the lifting passage is discharged into the furnace through the exhaust passage.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1. When the bottom discharge of the furnace is blocked due to the deposition of precious metals, the furnace discharge operation can be realized, thereby improving the efficiency and service life of the furnace;

[0033] 2. The liquid level of the molten glass in the molten pool is relatively stable, the electrode parameters change little, and the temperature system in the furnace is stable;

[0034] 3. The material discharge is stable, reducing the risk of accidents such as cap barrels.

[0035] 4. By optimizing and improving the design of the overflow discharge system, continuous and stable discharge of the furnace can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the structure of the overflow discharge system in Example 2 of the present invention;

[0037] Figure 2 It is a structural schematic diagram of the lifting device in Example 2 of the present invention.

[0038] In the figure: 1-gas lifting assembly; 2-lifting channel; 3-overflow channel; 4-heating electrode; 5-discharge port; 6-overflow discharge sleeve; 7-observation hole; 8-exhaust channel; 9-start heating element; 10-bracket; 11-bubbling tube; 12-thermocouple; 13-second sleeve. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0040] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this patent 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. Therefore, they should not be understood as limitations on this patent.

[0042] In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood in a broad sense. For example, they can refer to fixed connection or set, detachable connection or set, or integral connection or set. Those skilled in the art will understand the specific meanings of the above terms in this patent based on the specific circumstances.

[0043] Example 1

[0044] This embodiment provides an overflow discharging system, comprising:

[0045] A lifting channel connected to the furnace roof;

[0046] a lifting device connected to the lifting channel, the lifting device being used to lift the radioactive glass melt in the furnace into the lifting channel;

[0047] The overflow channel includes an overflow channel body and a discharge port provided on the overflow channel body. The overflow channel body is connected to the lifting channel. The molten glass in the lifting channel overflows into the overflow channel.

[0048] The discharging device is connected to the discharging port and is used to discharge the molten glass.

[0049] The beneficial effects of this embodiment are as follows:

[0050] 1. When the bottom discharge of the furnace is blocked due to the deposition of precious metals, the furnace discharge operation can be realized, thereby improving the efficiency and service life of the furnace;

[0051] 2. The liquid level of the molten glass in the molten pool is relatively stable, the electrode parameters change little, and the temperature system in the furnace is stable;

[0052] 3. The material discharge is stable, reducing the risk of accidents such as cap barrels.

[0053] 4. By optimizing and improving the design of the overflow discharge system, continuous and stable discharge of the furnace can be achieved.

[0054] Example 2

[0055] like Figure 1 As shown, this embodiment provides an overflow discharge system, comprising:

[0056] Lifting channel 2, connected to the furnace top;

[0057] a lifting device connected to the lifting channel 2, the lifting device being used to lift the radioactive glass melt in the furnace into the lifting channel 2;

[0058] The overflow channel 3 includes an overflow channel body and a discharge port 5 provided on the overflow channel body. The overflow channel body is connected to the lifting channel 2. The molten glass in the lifting channel 2 overflows into the overflow channel 3.

[0059] The discharging device is connected to the discharging port 5 and is used to discharge the molten glass.

[0060] Specifically, the lifting channel 2 in this embodiment is a vertical liquid lifting channel, and the overflow channel 3 is a horizontal flow channel.

[0061] The radioactive glass melt in the lifting channel 2 flows from bottom to top and overflows laterally into the overflow channel 3 .

[0062] like Figure 2 As shown, preferably, the lifting device is a gas lifting assembly 1, and the lifting gas of the gas lifting assembly 1 is air or nitrogen.

[0063] Preferably, the gas lift assembly 1 includes a bubbling tube 11, a level gauge, and a temperature detector. The bubbling tube 11 is connected to the lift channel 2 and is used to blow gas into the lift channel 2. The level gauge is connected to the furnace roof, and the temperature detector is connected to the furnace roof. Preferably, the blown gas is air or nitrogen.

[0064] The bubbler tube is used to blow gas into the riser channel, and a temperature detector detects whether the temperature has reached the discharge temperature. The start and stop of glass discharge is based on the glass level in the furnace, which is detected by a level gauge. The gas lift assembly uses the principle of bubbling to lift the molten glass. When gas from the bubbler tube is injected into the overflow channel, the density of the glass liquid there is lower than that in the melt pool, causing the glass level in the riser channel to naturally rise.

[0065] Specifically, the gas blown in in this embodiment is nitrogen.

[0066] Specifically, the liquid level meter in this embodiment is a liquid level measuring instrument.

[0067] Preferably, the gas lift assembly 1 further comprises:

[0068] The first connecting part includes: a flange, a first sleeve, a second sleeve 13, and a third sleeve. The flange is connected to the top of the furnace. The first sleeve, the second sleeve 13, and the third sleeve are respectively arranged on the flange and pass through the flange. The first sleeve is arranged outside the bubbling tube 11, the second sleeve 13 is arranged outside the liquid level gauge, and the third sleeve is arranged outside the temperature detector.

[0069] Specifically, in this embodiment, the first, second, and third sleeves are all made of Inconel 690 alloy tubes, and the temperature detector is a thermocouple 12. The first and second sleeves 13, extending from the top of the furnace, are connected to the flange via hose connectors, specifically welded to the flange. The third sleeve is connected to the flange via a dedicated thermocouple 12 connector. The first, second, and third sleeves can all be remotely operated and assembled. They are each connected to a bracket 10, which in turn is connected to the flange via the bracket 10.

[0070] Preferably, the overflow discharging system further comprises:

[0071] The heating device is connected to the overflow channel 3 and is used to heat the overflow channel 3 .

[0072] Preferably, the heating device includes: a heating element and a conductive layer. The heating element is arranged outside the overflow channel 3 , and the conductive layer is arranged between the heating element and the outer wall of the overflow channel 3 . The heating element is used for heating.

[0073] The inner layer of the overflow channel is made of refractory ceramic bricks, and plate electrodes are provided on the outside of the ceramic bricks. The plate electrodes are three pairs of Inconel690 material plate electrodes. The ceramic bricks are secondary heated by the plate electrodes. At high temperatures, the ceramic bricks have high electrical conductivity and generate Joule heat that radiates to the overflow channel.

[0074] Specifically, the heating element in this embodiment is the heating electrode 4 , and the material of the conductive layer is a coated ceramic material.

[0075] Preferably, the overflow channel 3 is made of refractory ceramic bricks.

[0076] Specifically, the material of the refractory ceramic brick in this embodiment contains more than 99mas% Cr2O3.

[0077] Preferably, the overflow channel 3 is made of a heat-insulating material.

[0078] Specifically, the thermal insulation material in this embodiment contains more than 99mas% Cr2O3.

[0079] Preferably, the overflow discharging system further comprises: a heat-insulating layer, which is arranged outside the overflow channel 3 and is used for heat preservation.

[0080] Three pairs of plate-shaped heating electrodes 4 made of Inconel 690 are installed outside the ceramic bricks. The ceramic bricks are heated by the plate-shaped heating electrodes 4. At high temperatures, the ceramic bricks have high electrical conductivity and generate Joule heat that is radiated to the overflow channel 3. A layer of highly conductive smeared ceramic material is placed between the heating electrodes 4 and the ceramic bricks to improve the surface contact between the two. The shaft tubes of the heating electrodes 4 extend out of the overflow discharge area and are fixed to the supports on both sides. The tail of the heating electrode 4 and its support structure take into account airtightness, insulation, and thermal deformation compensation. A thermocouple sleeve is installed in the center of each heating electrode 4. The outer layer of the overflow discharge area is a multi-layer insulation layer.

[0081] Preferably, the discharging device includes: a discharging pipe, an overflow discharging sleeve 6, the discharging pipe is connected to the discharge port 5, the overflow discharging sleeve 6 is used to connect with the product container to form a closed discharging, and the overflow discharging sleeve 6 includes: an overflow discharging sleeve body, an overflow discharging channel arranged in the overflow discharging sleeve body, and an overflow lining pipe arranged in the overflow discharging channel. The overflow discharging sleeve body is connected to the discharging pipe, and the discharge end of the overflow lining pipe is a maze channel.

[0082] Specifically, the overflow discharge sleeve 6 in this embodiment connects to the product container during discharge, forming a closed discharge. The overflow discharge sleeve 6 can be remotely disassembled and assembled. An overflow liner tube, made of an Inconel 690 alloy, is housed within the overflow discharge sleeve 6. If molten glass adheres to the inner wall of this liner tube during discharge, it can be removed and cleaned remotely. The bottom of the overflow discharge sleeve 6 features a labyrinthine structure to prevent atmosphere from escaping.

[0083] Preferably, the discharging device further comprises:

[0084] The second connecting piece is provided between the overflow discharge sleeve 6 and the discharge pipe, and the overflow discharge sleeve 6 is connected to the discharge pipe through the second connecting piece.

[0085] Preferably, the overflow discharging system further comprises:

[0086] The observation hole 7 is provided on the discharging device and is used to observe the discharging of the molten glass.

[0087] The overflow discharge system allows observation through observation hole 7 as the discharge flow from the end of the overflow liner of the discharge device flows into the product container. The discharge flow can be observed from the side, and observing changes in the discharge flow rate helps control the discharge rate. The degree of "retraction" of the discharge flow in the discharge channel is related to the glass flow rate. The discharge flow must be monitored to ensure that the furnace glass continuously flows into the product container. A constant air flow is provided to sweep away volatile gases from the glass on the sight glass of observation hole 7, ensuring clear observation.

[0088] Preferably, the overflow channel 3 is inclined downward, and the downward slope is 1-5 degrees.

[0089] Preferably, the overflow discharging system further comprises:

[0090] The exhaust channel 8 is connected to the lifting channel 2, and the exhaust channel 8 is used for exhaust.

[0091] Preferably, the exhaust channel 8 is also connected to the furnace, and the gas in the lifting channel 2 is discharged into the furnace through the exhaust channel 8.

[0092] Specifically, the flange in this embodiment is connected to the furnace top through a flange support, and the short pipe surface of the flange support also leads to an exhaust channel 8, which is connected to the pipe led out from the short pipe side of the flange support connected to the spare port on the furnace top by a remote disassembly and assembly single-tube jumper. Its function is to introduce the exhaust gas of the overflow discharge into the furnace and discharge it together with the process exhaust gas.

[0093] To discharge the material, nitrogen must first be injected into the bottom of the bubbling tube 11. The nitrogen is injected into the lifting channel 2 through the bubbling tube 11. The density of the molten glass there is lower than that in the molten pool of the furnace, causing the liquid level of the molten glass in the lifting channel 2 to rise naturally.

[0094] Furthermore, the glass melt in the lifting channel 2 enters the overflow channel 3 , and the glass melt flows downward along the discharge pipe under the action of gravity, and flows into the product container from the overflow discharge sleeve 6 .

[0095] Furthermore, the blown gas enters the furnace air cavity from the lifting channel 2 through the exhaust channel 8 connecting the furnace top and the upper air cavity of the furnace, and is then discharged into the exhaust gas treatment system through the exhaust pipe connected to the furnace.

[0096] Furthermore, the discharge rate of the glass melt is controlled by the injection rate of the blowing gas.

[0097] Furthermore, the start and stop of the glass melt discharge is based on the glass melt level in the furnace. The glass melt level is maintained within a certain range to obtain a stable cold cap and discharge rate. The overflow channel 3 is tilted downward by 1-5 degrees into the furnace molten pool to ensure that the discharge can be stopped properly, thereby controlling the discharge accuracy.

[0098] Furthermore, a camera system located above the product container is used to observe the glass melt discharge flow to monitor the discharge process. The glass melt level in the product container must be monitored to prevent overflow.

[0099] The overflow discharge area is provided with a discharge start heating element 9 (silicon carbon rod), which is used to heat the temperature of the horizontal flow channel of the overflow area to about 850-1050°C, and then put the Inconel690 alloy electrode into operation to maintain a suitable discharge temperature.

[0100] The start-up heating element is located above the overflow channel. Three pairs of electrodes are located at the inlet, middle, and outlet areas of the overflow channel. The electrode shaft tube extends beyond the overflow discharge area and is secured to supports on both sides. The heating element is used for start-up heating; the electrodes are used for secondary heating.

[0101] like Figure 1 As shown, for discharging, nitrogen must first be injected into the bottom of the bubbling tube 1. The nitrogen is injected into the gas lifting assembly 1 and then enters the lifting channel 2. When the gas enters the lifting channel 2, the density of the molten glass in the lifting channel 2 is small. The molten glass then enters the lifting channel 2, and the molten glass in the lifting channel 2 rises. The molten glass is lifted into the overflow channel 3. The injected gas rises to the exhaust channel 8 in the lifting channel 2, and then enters the furnace air cavity through the exhaust channel 8, and is then discharged into the exhaust system through the tail gas pipe connected to the furnace air cavity. The molten glass flows downward along the discharge port 5 under the action of gravity, and flows into the product container from the discharge pipe 6. The discharge rate of the molten glass is controlled by the nitrogen injection rate.

[0102] During overflow discharge, the temperature in overflow channel 3 must be maintained at approximately 1100°C to maintain the flow of the molten glass. This is heated by refractory ceramic bricks within the overflow channel 3, which are heated by three pairs of plate-shaped heating electrodes 4. After the overflow discharge system begins heating for a certain period of time, it is activated with a compressed gas flow rate of 10-200 L / h. After approximately 20 minutes, the gas flow rate increases to 250-500 L / h, and manual control is then applied to maintain the molten glass flow rate at 100-250 kg / h.

[0103] When the molten glass product approaches the target weight, the bubbler is used to control the flow rate of the molten glass until it stops. After the bubbler is stopped, the molten glass flow gradually tapers, transitioning from a continuous flow to an intermittent trickle at a certain flow rate before completely stopping. This relatively easy stopping is due to the reverse slope of the overflow channel 3. Furthermore, this method does not cause stringing after several hours of cessation of the molten glass flow.

[0104] The overflow discharge system in this embodiment can be used as a backup method for discharging molten glass from the bottom of the furnace during solidification of radioactive waste glass. It can also be used as a discharge method during daily operation, aiming to discharge molten glass from the furnace at a desired rate if the bottom discharge is unavailable. Uncontrollable factors such as glass crystallization, precious metal deposition, or molten bath refractory brick shedding can cause the bottom discharge system of the furnace to become clogged or the bottom electrode to become damaged, rendering it unable to discharge material. However, overflow discharge through the overflow discharge system avoids crystallization and precious metal deposition issues at the bottom of the furnace, preventing bottom discharge blockage.

[0105] The beneficial effects of this embodiment are as follows:

[0106] 1. When the bottom discharge of the furnace is blocked due to the deposition of precious metals, the furnace discharge operation can be realized, thereby improving the efficiency and service life of the furnace;

[0107] 2. The liquid level of the molten glass in the molten pool is relatively stable, the electrode parameters change little, and the temperature system in the furnace is stable;

[0108] 3. The material discharge is stable, reducing the risk of accidents such as cap barrels.

[0109] 4. By optimizing and improving the design of the overflow discharge system, continuous and stable discharge of the furnace can be achieved.

[0110] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An overflow discharge system, characterized in that: include: A lifting channel connected to the furnace roof; A lifting device connected to the lifting channel, the lifting device is used to lift the radioactive glass melt in the furnace into the lifting channel; The overflow channel comprises an overflow channel body and a discharge port arranged on the overflow channel body, wherein the overflow channel body is connected to the lifting channel, and the molten glass in the lifting channel overflows into the overflow channel; The discharging device is connected to the discharging port and is used to discharge the molten glass.

2. The overflow discharge system according to claim 1, characterized in that: The lifting device is a gas lifting component, and the lifting gas of the gas lifting component is air or nitrogen.

3. The overflow discharge system according to claim 2, characterized in that: The gas lifting component includes: a bubbling tube, a liquid level meter, and a temperature detector. The bubbling tube is connected to the lifting channel and is used to blow gas into the lifting channel. The liquid level meter is connected to the top of the furnace and the temperature detector is connected to the top of the furnace.

4. The overflow discharge system according to claim 3, characterized in that: The gas lift assembly also includes: The first connecting member includes: a flange, a first sleeve, a second sleeve, and a third sleeve. The flange is connected to the furnace top. The first sleeve, the second sleeve, and the third sleeve are respectively arranged on the flange and penetrate the flange. The first sleeve is arranged outside the bubbling tube, the second sleeve is arranged outside the liquid level meter, and the third sleeve is arranged outside the temperature detector.

5. The overflow discharge system according to claim 1, characterized in that: Also includes: The heating device is connected to the overflow channel and is used to heat the overflow channel.

6. The overflow discharge system according to claim 5, characterized in that: The heating device comprises: a heating element and a conductive layer. The heating element is arranged outside the overflow channel, the conductive layer is arranged between the heating element and the outer wall of the overflow channel, and the heating element is used for heating.

7. The overflow discharge system according to any one of claims 1, 5 and 6, characterized in that: The overflow channel is made of refractory ceramic bricks.

8. The overflow discharge system according to any one of claims 1, 5 and 6, characterized in that: The material of the overflow channel is a thermal insulation material.

9. The overflow discharge system according to claim 1, characterized in that: Also includes: The heat-insulating layer is arranged outside the overflow channel and is used for heat preservation.

10. The overflow discharge system according to claim 1, characterized in that: The discharge device includes: a discharge pipe and an overflow discharge sleeve. The discharge pipe is connected to the discharge port. The overflow discharge sleeve is used to connect with the product container to form a closed discharge. The overflow discharge sleeve includes: an overflow discharge sleeve body, an overflow discharge channel arranged in the overflow discharge sleeve body, and an overflow liner arranged in the overflow discharge channel. The overflow discharge sleeve body is connected to the discharge pipe, and the discharge end of the overflow liner is a labyrinth channel.

11. The overflow discharge system according to claim 10, characterized in that: The discharging device also includes: The second connecting piece is arranged between the overflow discharge sleeve and the discharge pipe, and the overflow discharge sleeve is connected to the discharge pipe through the second connecting piece.

12. The overflow discharge system according to claim 1, characterized in that: Also includes: The observation hole is arranged on the discharging device and is used to observe the discharging of the molten glass.

13. The overflow discharge system according to claim 1, characterized in that: The overflow channel is inclined downward, and the downward slope is 1 to 5 degrees.

14. The overflow discharge system according to claim 1, characterized in that: Also includes: An exhaust passage is connected to the lifting passage, and the exhaust passage is used for exhausting air.

15. The overflow discharge system according to claim 14, characterized in that: The exhaust passage is also connected to the furnace, and the gas in the lifting passage is discharged into the furnace through the exhaust passage.

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