Nitrogen supply line system and glass production line

Abstract

The application discloses a nitrogen supply pipeline system and a glass production line. The nitrogen supply pipeline system comprises a liquid nitrogen storage tank, a vaporizing device, a tin tank, an evacuation collector, a bubbler and a melting furnace; the liquid nitrogen storage tank is provided with an exhaust port; the vaporizing device is provided with a first inlet and a first outlet, the first inlet is communicated with the exhaust port through a first pipeline; the first outlet is communicated with the tin tank through a second pipeline; the evacuation collector is provided with a second inlet and a second outlet, the second inlet is communicated with the exhaust port through a third pipeline, and the first pipeline and the third pipeline are arranged in parallel; the second outlet is communicated with the bubbler through a fourth pipeline; and the bubbler is arranged in the melting furnace. On one hand, the application can broaden the use way of nitrogen in the liquid nitrogen storage tank, and reduce the waste of nitrogen in the liquid nitrogen storage tank; on the other hand, nitrogen can be used as the gas for stirring the glass liquid in the melting furnace, and is beneficial to the control of the atmosphere in the rear section of the melting furnace.

Description

Technical Field

[0001] This application relates to the field of glass production technology, and in particular to a nitrogen supply pipeline system and a glass production line. Background Technology

[0002] Nitrogen is required as a protective gas for the tin bath in float glass production. Normally, nitrogen is produced by a distillation tower to supply the tin bath. To ensure a stable nitrogen supply, liquid nitrogen storage tanks are installed at the nitrogen station as backup gas. However, during nitrogen storage, heat from the surrounding environment slowly enters the tank through various means, causing some of the liquid nitrogen to vaporize into gaseous nitrogen. To maintain tank pressure, some of this gaseous nitrogen needs to be continuously released and vented, resulting in nitrogen waste. Utility Model Content

[0003] The main objective of this application is to propose a nitrogen supply pipeline system and a glass production line, which aims to improve the problem of nitrogen waste in nitrogen storage tanks.

[0004] To achieve the above objectives, the nitrogen supply pipeline system proposed in this application includes a liquid nitrogen storage tank, a vaporization device, a tin bath, an vent collector, a bubbler, and a melting furnace; the liquid nitrogen storage tank has an exhaust port; the vaporization device has a first inlet and a first outlet, the first inlet being connected to the exhaust port via a first pipeline; the first outlet being connected to the tin bath via a second pipeline; the vent collector has a second inlet and a second outlet, the second inlet being connected to the exhaust port via a third pipeline, the first pipeline and the third pipeline being connected in parallel; the bubbler has an inlet end and an outlet end, the second outlet being connected to the inlet end via a fourth pipeline; the melting furnace is connected to the outlet end.

[0005] In one embodiment, a first pressure regulating valve is provided between the bubbler and the venting collector.

[0006] In one embodiment, the vent collector further has a third outlet connected to a first vent pipe, which is provided with a first vent valve.

[0007] In one embodiment, a gas storage tank is provided on the second pipeline.

[0008] In one embodiment, the gas storage tank has an inlet end and an outlet end that are interconnected; the second pipeline is also provided with a second pressure regulating valve, which is connected to the inlet end, and the tin bath is connected to the outlet end.

[0009] In one embodiment, the second pressure regulating valve is a self-regulating pressure regulating valve.

[0010] In one embodiment, the second pipeline is further provided with a proportional-integral-derivative pressure regulating valve, which is connected in series with the self-regulating pressure regulating valve and is located between the self-regulating pressure regulating valve and the gas storage tank.

[0011] In one embodiment, the outlet end is provided with a first outlet and a second outlet. The first outlet is connected to the tin bath, and the second outlet is also connected to a second vent pipe, which is provided with a second vent valve.

[0012] In one embodiment, the inlet end is provided with a first shut-off valve; and / or, the outlet end is provided with a second shut-off valve.

[0013] This application also proposes a glass production line, including the aforementioned nitrogen supply pipeline system.

[0014] This application connects the first inlet of the vaporization device to the exhaust port of the liquid nitrogen storage tank via a first pipeline, and the first outlet of the vaporization device to the tin bath via a second pipeline. When the tin bath requires nitrogen as a protective gas, a portion of the nitrogen in the liquid nitrogen storage tank can sequentially enter the tin bath through the first and second pipelines, thus providing a protective gas for glass production. Furthermore, this application connects the second inlet of the vent collector to the exhaust port of the liquid nitrogen storage tank, connects the second outlet of the vent collector to the inlet of the bubbler via a fourth pipeline, and connects the outlet of the bubbler to the melting furnace. This allows a portion of the gas in the liquid nitrogen storage tank to enter the bubbler through the vent collection pipe and then be bubbled into the melting furnace. This expands the utilization of nitrogen in the liquid nitrogen storage tank by utilizing the gas that vaporizes from liquid to gaseous nitrogen at ambient temperature, reducing nitrogen waste. It also allows nitrogen to be used to agitate the molten glass in the melting furnace, thus facilitating atmosphere control in the later stages of the melting furnace during the production of ultra-clear glass. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structural connection of an embodiment of the nitrogen supply pipeline system of this application; Figure 2 This is a schematic diagram of the structural connection of another embodiment of the nitrogen supply pipeline system of this application; Figure 3This is a schematic diagram of the structural connection of another embodiment of the nitrogen supply pipeline system of this application; Figure 4 This is a structural connection diagram of yet another embodiment of the nitrogen supply pipeline system of this application; Figure 5 This is a schematic diagram of the structural connection of another embodiment of the nitrogen supply pipeline system of this application.

[0017] Explanation of icon numbers: 100. Liquid nitrogen storage tank; 110. Exhaust port; 200. Vaporization device; 210. First inlet; 220. First outlet; 300. Tin bath; 400. Emptying collector; 410. Second inlet; 420. Second outlet; 430. Third outlet; 500. Bubble blower; 510. Air inlet; 520. Air outlet; 600. Melting furnace; 710. First pressure regulating valve; 720. First vent valve; 800. Gas storage tank; 810. Inlet end; 820. Outlet end; 821. First row outlet; 822. Second row outlet; 910. Second pressure regulating valve; 920. Proportional-integral-derivative pressure regulating valve; 930. Second vent valve; 10. First pipeline; 20. Second pipeline; 30. Third pipeline; 40. Fourth pipeline; 50. First vent pipe; 60. Second vent pipe.

[0018] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0022] Nitrogen is required as a protective gas for the tin bath in float glass production. Normally, nitrogen is produced by a distillation tower to supply the tin bath. To ensure a stable nitrogen supply, liquid nitrogen storage tanks are installed at the nitrogen station as backup gas. However, during nitrogen storage, heat from the surrounding environment slowly enters the tank through various means, causing some of the liquid nitrogen to vaporize into gaseous nitrogen. To maintain tank pressure, some of this gaseous nitrogen needs to be continuously released and vented, resulting in nitrogen waste.

[0023] To address the issue of nitrogen waste within nitrogen storage tanks, this application proposes a nitrogen supply pipeline system, such as... Figure 1 As shown, the nitrogen supply pipeline system includes a liquid nitrogen storage tank 100, a vaporization device 200, a tin bath 300, an evacuation collector 400, a bubbler 500, and a melting furnace 600. The liquid nitrogen storage tank 100 has an exhaust port 110. The vaporization device 200 has a first inlet 210 and a first outlet 220. The first inlet 210 is connected to the exhaust port 110 through a first pipeline 10. The first outlet 220 is connected to the tin bath 300 through a second pipeline 20. The evacuation collector 400 has a second inlet 410 and a second outlet 420. The second inlet 410 is connected to the exhaust port 110 through a third pipeline 30. The first pipeline 10 and the third pipeline 30 are connected in parallel. The bubbler 500 has an inlet end 510 and an outlet end 520. The second outlet 420 is connected to the inlet end 510 through a fourth pipeline 40. The melting furnace 600 is connected to the outlet end 520.

[0024] The liquid nitrogen storage tank 100 has an exhaust port 110, which is connected to the first inlet 210 of the vaporization device 200 via a first pipe 10 and to the second inlet 410 of the vent collector 400 via a third pipe 30. The first pipe 10 and the third pipe 30 are connected in parallel, allowing the nitrogen gas in the liquid nitrogen storage tank 100 to be divided into two streams, entering the vaporization device 200 and the vent collector 400 respectively. The vaporization device 200 is a device used to fully vaporize the liquid nitrogen carried in the gas discharged from the liquid nitrogen storage tank 100. It should be noted that the vaporization device 200 is a technology well-known to those skilled in the art and will not be described in detail here. The vent collector 400 can be a vent pipe or a vent tank, etc. The vent collector 400 is used to collect at least a portion of the nitrogen gas released from the liquid nitrogen storage tank 100 under natural conditions, thereby collecting this nitrogen gas.

[0025] Specifically, there may be one, two, three, or more liquid nitrogen storage tanks 100. When there are two, three, or more liquid nitrogen storage tanks 100, these liquid nitrogen storage tanks 100 can be arranged in parallel, that is, the exhaust ports 110 of at least two liquid nitrogen storage tanks 100 can be connected to the same vaporization device 200, or the exhaust ports 110 of at least two liquid nitrogen storage tanks 100 can be connected to the same vent collector 400. Of course, each liquid nitrogen storage tank 100's exhaust port 110 can also be connected to a vaporization device 200, and then at least two vaporization devices 200 can be connected to the same tin bath 300. Each liquid nitrogen storage tank 100's exhaust port 110 can be connected to a vent collector 400, and then each vent collector 400 can be connected to the same melting furnace 600. Each liquid nitrogen storage tank 100 may have an exhaust port 110, which may be equipped with a three-way valve. One end of the three-way valve is connected to the exhaust port, and the other two ends are connected to the first pipeline 10 and the third pipeline 30, respectively. Alternatively, the exhaust port 110 of the liquid nitrogen storage tank 100 may include an exhaust port with a three-way pipe installed thereon. One end of the three-way pipe is connected to the exhaust port, and the other two ends are connected to the first pipeline 10 and the third pipeline 30, respectively. Alternatively, the exhaust port 110 of the liquid nitrogen storage tank 100 may include at least two exhaust ports, with the first pipeline 10 and the third pipeline 30 respectively connected to the two exhaust ports. When venting, the liquid nitrogen storage tank 100 may simultaneously vent to the first pipeline 10 and the third pipeline 30, that is, simultaneously vent nitrogen into the melting furnace 600 and the tin bath 300. Alternatively, when venting the liquid nitrogen storage tank 100, one of the first pipeline 10 and the third pipeline 30 can be selected for venting. At this time, shut-off valves can be installed on the first pipeline 10 and the third pipeline 30 to control the on / off state of the first pipeline 10 and the third pipeline 30.

[0026] In the glass production process, raw materials are mixed together and fed into a melting furnace 600. After being heated to a high temperature and melted, they form molten glass, which is then cooled and shaped into glass products in a tin bath 300. To ensure uniform mixing of the molten raw materials and to quickly remove the various gases generated by the reactions of the raw materials from the molten glass, the molten glass needs to undergo clarification and homogenization within the melting furnace 600. A bubbler 500 is typically installed at the bottom of the glass melting furnace 600. However, in other examples, the bubbler 500 can also be located outside the melting furnace 600. The bubbler 500 continuously blows gas into the molten glass from the bottom of the melting furnace 600 in the form of bubbles, agitating the molten glass and promoting convection, thereby achieving clarification and homogenization. In this application, the second outlet 420 of the vent collector 400 is connected to the inlet 510 of the bubbler 500 via a fourth pipe 40, and the outlet 520 of the bubbler 500 is connected to the melting furnace 600. This allows at least a portion of the nitrogen released from the liquid nitrogen storage tank 100 under natural conditions to be used within the melting furnace 600, thereby saving resources and improving nitrogen utilization. Furthermore, compared to blowing compressed air into the melting furnace 600, this application uses nitrogen released from the liquid nitrogen storage tank 100 as the gas blown out by the bubbler 500, reducing the amount of compressed air needed to enter the melting furnace 600, lowering the oxygen content, and thus reducing the risk of oxidation conditions. This is beneficial for controlling the atmosphere in the latter part of the melting furnace 600 during the production of ultra-clear glass.

[0027] This application connects the first inlet 210 of the vaporization device 200 to the exhaust port 110 of the liquid nitrogen storage tank 100 via the first pipeline 10, and the first outlet 220 of the vaporization device 200 to the tin bath 300 via the second pipeline 20. Therefore, when the tin bath 300 requires nitrogen as a protective gas, a portion of the nitrogen in the liquid nitrogen storage tank 100 can enter the tin bath 300 by sequentially passing through the first pipeline 10 and the second pipeline 20, thereby providing a protective gas for glass production. Furthermore, in this application, by connecting the second inlet 410 of the vent collector 400 to the exhaust port 110 of the liquid nitrogen storage tank 100, connecting the second outlet 420 of the vent collector 400 to the air inlet 510 of the bubbler 500 through the fourth pipe 40, and connecting the air outlet 520 of the bubbler 500 to the melting furnace 600, a portion of the gas in the liquid nitrogen storage tank 100 can also enter the bubbler 500 through the vent collection pipe, and then be blown into the melting furnace 600 through the bubbler 500. This expands the utilization of nitrogen in the liquid nitrogen storage tank 100, utilizing the gas that vaporizes from liquid to gaseous nitrogen at ambient temperature within the liquid nitrogen storage tank 100, reducing nitrogen waste. On the other hand, nitrogen is used as the gas to agitate the molten glass in the melting furnace 600, reducing the amount of compressed air introduced into the melting furnace 600 and lowering the oxygen content, which is beneficial for controlling the atmosphere in the latter part of the melting furnace 600 during the production of ultra-clear glass.

[0028] like Figure 2 As shown, in some examples of this application, a first pressure regulating valve 710 is provided between the bubbler 500 and the venting collector 400.

[0029] The first pressure regulating valve 710, also known as a pressure regulating valve, is used to regulate the gas pressure on the fourth pipeline 40, thereby maintaining a constant gas pressure on the fourth pipeline 40. The first pressure regulating valve 710 can be a diaphragm type pressure regulating valve, a spring diaphragm type pressure regulating valve, a piston type pressure regulating valve, a lever type pressure regulating valve, or a bellows type pressure regulating valve, etc.

[0030] By installing a first pressure regulating valve 710 on the fourth pipeline 40, the gas pressure on the fourth pipeline 40 can be kept stable, thereby ensuring that the gas pressure entering the bubbler 500 and the melting furnace 600 is constant, which improves the service life of the bubbler 500 and makes the stirring rate of the glass melt more constant.

[0031] like Figure 3 As shown, in some examples of this application, the vent collector 400 also has a third outlet 430, which is connected to a first vent pipe 50, on which a first vent valve 720 is provided.

[0032] The first vent pipe 50 refers to the pipe used to discharge to the outside. The first vent pipe 50 can be a straight pipe or a bend, etc.

[0033] By connecting the third outlet 430 of the vent collector 400 to the first vent pipe 50, and the first vent pipe 50 is equipped with a first vent valve 720, the connection and disconnection status between the first vent pipe 50 and the outside world can be controlled by the first vent valve 720.

[0034] When the bubbler 500 is closed for a long time, the first vent valve 720 can be opened. At this time, the first vent pipe 50 is connected to the outside, so that the gas in the vent collector 400 can be discharged to the outside air, reducing the risk of nitrogen gas accumulating in the vent collector and causing an explosion.

[0035] Furthermore, the first vent valve 720 can be a flow valve.

[0036] With this configuration, the flow rate of the vented gas can be adjusted to control the flow rate of gas entering the fourth pipe 40 from the vent collector 400, thereby achieving the effect of regulating the gas pressure on the fourth pipe 40.

[0037] To better monitor the gas pressure on the fourth pipeline 40, a pressure monitoring device can be installed on the fourth pipeline 40. This pressure monitoring device can be electrically connected to the first pressure regulating valve 710. With this configuration, the gas pressure on the fourth pipeline 40 can be monitored in real time, and the monitored gas pressure value can be sent to the first pressure regulating valve 710, thereby controlling the operation of the first pressure regulating valve 710 to maintain the pressure on the fourth pipeline 40 at a constant level.

[0038] Please refer to the reference. Figures 1 to 3 In some examples of this application, the second pipeline 20 is provided with a gas storage tank 800.

[0039] By installing a gas storage tank 800 on the second pipeline 20, the gas storage tank 800 can buffer the gas discharged from the vaporization device 200, and then stabilize the pressure in the buffer tank before entering the tin bath 300, thereby reducing the risk of pressure fluctuation.

[0040] Please refer to the reference. Figure 4 and Figure 5 In some examples of this application, the gas storage tank 800 has an inlet end 810 and an outlet end 820 that are interconnected; the second pipeline 20 is also provided with a second pressure regulating valve 910, which is connected to the inlet end 810, and the tin bath 300 is connected to the outlet end 820.

[0041] The second pressure regulating valve 910 can be a manually operated valve or an automatically operating valve for pressure regulation. Based on its structure, the second pressure regulating valve 910 can be a diaphragm type pressure regulating valve, a spring-loaded diaphragm type pressure regulating valve, a piston type pressure regulating valve, a lever type pressure regulating valve, or a bellows type pressure regulating valve, etc.

[0042] By installing a second pressure regulating valve 910 on the second pipeline 20, which is connected to the inlet 810 of the gas storage tank 800, the second pressure regulating valve 910 can regulate the pressure of the gas discharged from the vaporization device 200. For example, if the gas pressure discharged from the vaporization device 200 is 0.4MPa~0.6MPa, the second pressure regulating valve 910 can reduce the gas pressure to 0.2MPa~0.3MPa before it enters the gas storage tank 800, thus providing a good buffering effect and greatly reducing the risk of pressure fluctuations. This makes the nitrogen supply system of the tin bath 300 more stable and improves the quality of glass production.

[0043] Please refer to the reference. Figure 4 and Figure 5 In some examples of this application, the second pressure regulating valve 910 is a self-regulating pressure regulating valve.

[0044] By setting the second pressure regulating valve 910 as a self-regulating pressure regulating valve, the gas pressure on the second pipeline 20 can be automatically adjusted without the need for manual operation of the second pressure regulating valve 910. This improves both the pressure regulation efficiency and the stability of the pressure regulation.

[0045] Please refer to the reference. Figure 4 and Figure 5 In some examples of this application, the second pipeline 20 is also provided with a proportional-integral-derivative pressure regulating valve 920, which is connected in series with the self-regulating pressure regulating valve and is located between the self-regulating pressure regulating valve and the gas storage tank 800.

[0046] The proportional-integral-derivative pressure regulating valve 920 refers to a valve that can precisely adjust the valve opening to achieve stable control of process parameters such as flow rate and pressure.

[0047] By connecting the self-regulating pressure regulating valve and the proportional-integral-derivative pressure regulating valve 920 in series, and placing the proportional-integral-derivative pressure regulating valve 920 between the self-regulating pressure regulating valve and the gas storage tank 800, the self-regulating pressure regulating valve can serve as the first-stage coarse adjustment device, and the proportional-integral-derivative pressure regulating valve 920 can serve as the second-stage fine adjustment device. This improves the control accuracy of the gas pressure on the second pipeline 20, better copes with disturbances in the system, and enhances the stability of the system.

[0048] like Figure 5 As shown, in some examples of this application, the outlet end 820 is provided with a first outlet 821 and a second outlet 822. The first outlet 821 is connected to the tin bath 300, and the second outlet 822 is also connected to a second vent pipe 60. The second vent pipe 60 is provided with a second vent valve 930.

[0049] The second vent pipe 60 also refers to a pipe that can connect to the outside world, and it can be a straight pipe or a bend, etc. The second vent valve 930 is a shut-off valve that can control whether the second vent pipe 60 is connected to the outside world.

[0050] Specifically, when nitrogen needs to be introduced into the tin bath 300 during the glass production process, the second vent valve 930 can be closed, allowing all the gas in the gas storage tank 800 to enter the tin bath 300. When the gas storage tank 800 needs to be cleaned, i.e., when the impurities in the gas storage tank 800 need to be discharged, the second vent valve 930 on the second vent pipe 60 can be opened, thereby connecting the second vent pipe 60 to the outside, and the impurities in the gas storage tank 800 can then be discharged through the second outlet 822 and the second vent pipe 60.

[0051] By connecting the first row of outlets 821 of the outlet end 820 to the tin bath 300 and the second row of outlets 822 to the second vent pipe 60, and by providing a second vent valve 930 on the second vent pipe 60, the gas in the gas storage tank 800 can both supply gas to the tin bath 300 and vent it, thus making it suitable for different occasions.

[0052] In some examples of this application, the inlet 810 is provided with a first shut-off valve (not shown).

[0053] By installing a first shut-off valve at the inlet end 810 of the gas storage tank 800, it is possible to control whether the gas discharged from the vaporization device 200 enters the gas storage tank 800. When there is no glass production process in the tin bath 300, the first shut-off valve at the inlet end 810 of the gas storage tank 800 can be closed to reduce the risk of nitrogen waste. When the glass production process is carried out in the tin bath 300, the first shut-off valve at the inlet end 810 of the gas storage tank 800 can be opened to allow nitrogen to be filled into the tin bath 300 as a protective gas during glass production.

[0054] In some examples of this application, the outlet 820 is provided with a second shut-off valve (not shown).

[0055] By setting a first shut-off valve at the outlet end 820 of the gas storage tank 800, it is possible to control whether the gas in the gas storage tank 800 enters the tin bath 300.

[0056] This application also proposes a glass production line, which includes a nitrogen supply pipeline system. The specific structure of the nitrogen supply pipeline system is as described in the above embodiments. Since this glass production line adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0057] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A nitrogen supply pipeline system, characterized in that, include: A liquid nitrogen storage tank, wherein the liquid nitrogen storage tank has an exhaust port; A vaporization device having a first inlet and a first outlet, the first inlet being connected to the exhaust port via a first pipeline; The solder bath, with the first outlet connected to the solder bath via a second pipeline; An exhaust collector having a second inlet and a second outlet, the second inlet being connected to the exhaust port via a third pipe, and the first pipe and the third pipe being connected in parallel; A bubbler having an air inlet and an air outlet, wherein the second outlet is connected to the air inlet via a fourth pipe; as well as A melting furnace, which is connected to the gas outlet.

2. The nitrogen supply pipeline system as described in claim 1, characterized in that, A first pressure regulating valve is provided between the bubbler and the venting collector.

3. The nitrogen supply pipeline system as described in claim 1, characterized in that, The vent collector also has a third outlet, which is connected to a first vent pipe, on which a first vent valve is provided.

4. The nitrogen supply pipeline system as described in any one of claims 1 to 3, characterized in that, The second pipeline is equipped with a gas storage tank.

5. The nitrogen supply pipeline system as described in claim 4, characterized in that, The gas storage tank has an inlet end and an outlet end that are connected to each other; the second pipeline is also equipped with a second pressure regulating valve, which is connected to the inlet end, and the tin bath is connected to the outlet end.

6. The nitrogen supply pipeline system as described in claim 5, characterized in that, The second pressure regulating valve is a self-operated pressure regulating valve.

7. The nitrogen supply pipeline system as described in claim 6, characterized in that, The second pipeline is also equipped with a proportional-integral-derivative pressure regulating valve, which is connected in series with the self-regulating pressure regulating valve and is located between the self-regulating pressure regulating valve and the gas storage tank.

8. The nitrogen supply pipeline system as described in claim 5, characterized in that, The outlet end is provided with a first outlet and a second outlet. The first outlet is connected to the tin bath, and the second outlet is also connected to a second vent pipe. The second vent pipe is provided with a second vent valve.

9. The nitrogen supply pipeline system as described in claim 5, characterized in that, The inlet end is provided with a first shut-off valve; and / or, the outlet end is provided with a second shut-off valve.

10. A glass production line, characterized in that, Includes the nitrogen supply pipeline system as described in any one of claims 1 to 9.

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