Furnace nose humidification system

Abstract

This application discloses a furnace nose humidification system, which includes a gas supply pipeline, a first pipeline, a second pipeline, and a mixing pipeline. The first pipeline includes a first branch, a second branch, a first heater, and a water tank. The gas supply pipeline is connected to the mixing pipeline through the first and second pipelines. Since the outlet of the first branch and the inlet of the second branch are located on the liquid surface, the nitrogen gas output from the outlet of the first branch can be humidified by water vapor in the water tank. Because the wet nitrogen gas obtained by water vapor humidification has low humidity, the adjustment range of the water temperature for obtaining the required amount of wet nitrogen gas in the furnace nose can be expanded. This allows for humidity regulation of the wet nitrogen gas within a larger water temperature adjustment range, facilitating humidity control and improving humidity control accuracy. Furthermore, this improves the control accuracy of dry and wet nitrogen gas in the furnace nose, enhances the accuracy of adjusting the dew point inside the furnace nose, reduces zinc ash defects, and improves the surface quality of the strip steel.

Description

Technical Field

[0001] This application belongs to the field of metallurgical process technology, specifically relating to a furnace nose humidification system. Background Technology

[0002] The furnace nose is a crucial piece of equipment in a hot-dip galvanizing production line. One end of the furnace nose connects to the outlet of the annealing furnace, while the other end extends below the surface of the molten zinc in the zinc bath. The strip steel passes through the furnace nose. Because the molten zinc generates zinc vapor at high temperatures, also known as zinc ash, some of this ash adheres to the inner wall of the furnace nose, and over time, accumulated zinc ash falls onto the strip steel. Other zinc ash adheres directly to the strip steel; both situations can cause zinc ash defects in the strip steel.

[0003] To address the zinc ash defect in strip steel production, the industry has installed humidifiers in the furnace nose. The humidifier uses nitrogen as the humidifier medium, which is split into two streams: one stream serves as dry nitrogen, while the other stream is moistened by water immersion at the bottom of a water tank to become wet nitrogen. The dry and wet nitrogen are mixed and fed into the furnace nose. By adjusting the ratio of dry to wet nitrogen flow rates, the dew point within the furnace nose is controlled, thus suppressing zinc ash formation.

[0004] In related technologies, nitrogen is introduced below the liquid level in the water tank. The nitrogen immersed in water has a high humidity, while the amount of wet nitrogen required to adjust the dew point inside the furnace nose is small, and the accuracy of the wet nitrogen delivery is not easy to control. Summary of the Invention

[0005] To address the technical problem of difficulty in accurately controlling the delivery volume of moist nitrogen in the furnace nose in related technologies, this application provides a furnace nose humidification system. The furnace nose humidification system includes:

[0006] Gas supply pipeline, including a gas supply pipe having a gas supply outlet;

[0007] The first pipeline includes a first branch, a second branch, a first proportional valve, a first heater, and a water tank. The first proportional valve is connected in series with the first branch. The first branch has a first branch inlet and a first branch outlet connected to the gas supply outlet. The first branch is inserted into the water tank and the first branch outlet is located on the liquid surface. The second branch has a second branch inlet and a second branch outlet. The second branch is inserted into the water tank and the second branch inlet is located on the liquid surface. The first heater is installed in the water tank and located below the liquid surface.

[0008] The second pipeline includes a second pipe and a second proportional valve connected in series with the second pipe. The second pipe has a second air inlet and a second air outlet. The second air inlet is connected to the air supply outlet.

[0009] A mixing pipeline includes a mixing pipe having a mixing inlet and a mixing outlet, a second branch outlet and a second outlet being connected to the mixing inlet, and the mixing outlet being connected to the furnace nose.

[0010] In some embodiments, the first pipeline further includes a first thermocouple, which is installed inside the water tank and has its measuring end extending below the liquid surface; or, the first thermocouple is located below the liquid surface.

[0011] In some embodiments, the mixing pipeline further includes a mixer connected in series to the mixing pipeline, the mixer having a third air inlet, and the second branch outlet and the second air outlet respectively connected to the third air inlet.

[0012] In some embodiments, the mixer has a third gas outlet, and the mixing pipeline further includes two first gas supply pipes and two second heaters arranged in parallel. The first gas supply pipe has a first gas supply inlet and a first gas supply outlet communicating with the third gas outlet. The first gas supply pipeline is connected in series with the second heaters, and the two first gas supply outlets are respectively connected to the furnace nose.

[0013] In some embodiments, the mixing pipeline further includes two second thermocouples, which are connected in series to the two first gas delivery pipes.

[0014] In some embodiments, the mixing pipeline further includes a third heater and a third thermocouple. The mixer, the third heater and the third thermocouple are connected in series to the mixing pipeline. The mixing pipeline includes two second gas supply pipes. The second gas supply pipes have a second gas supply inlet and a second gas supply outlet connected to the third thermocouple. The two second gas supply outlets are respectively connected to the furnace nose.

[0015] In some embodiments, the first pipeline further includes a first flow meter, which is connected in series to the first branch and located before the first proportional valve.

[0016] In some embodiments, the second pipeline further includes a second flow meter, which is connected in series to the second pipeline and located before the second proportional valve.

[0017] In some embodiments, the gas supply pipeline further includes a gas supply station and a solenoid valve. The gas supply pipeline has a gas supply inlet. The gas supply station is connected to the gas supply inlet. The solenoid valve is connected in series to the gas supply pipeline.

[0018] In some embodiments, the gas supply line further includes a pressure reducing valve and a pressure regulator, which are connected in series to the gas supply line and located after the solenoid valve.

[0019] According to one or more embodiments of this application, a furnace nose humidification system includes a gas supply pipeline, a first pipeline, a second pipeline, and a mixing pipeline. The first pipeline includes a first branch, a second branch, a first heater, and a water tank. The gas supply pipeline is connected to the mixing pipeline through the first and second pipelines. Since the outlet of the first branch and the inlet of the second branch are located on the liquid surface, the nitrogen gas output from the outlet of the first branch can be humidified by water vapor in the water tank. Because the wet nitrogen gas obtained by humidifying the nitrogen gas with water vapor has low humidity, the adjustment range of the water temperature for obtaining the required amount of wet nitrogen gas in the furnace nose can be expanded. This allows for humidity regulation of the wet nitrogen gas within a larger water temperature adjustment range, facilitating humidity control and improving the control accuracy of wet nitrogen gas humidity. Furthermore, this improves the control accuracy of dry and wet nitrogen gas in the furnace nose, enhances the accuracy of adjusting the dew point inside the furnace nose, improves zinc ash defects, and improves the surface quality of the strip steel. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the furnace nose humidification system in one or more embodiments of this application;

[0021] Figure 2 This is another structural schematic diagram of the furnace nose humidification system in one or more embodiments of this application.

[0022] Explanation of reference numerals in the attached figures:

[0023] 10. Gas supply pipeline; 11. Gas supply line; 12. Gas supply station; 13. Solenoid valve; 14. Pressure reducing valve; 15. Pressure regulator;

[0024] 20. First pipeline; 21. First branch; 22. First proportional valve; 23. First heater; 24. Water tank; 241. Inlet pipe; 242. Drain pipe; 25. First thermocouple; 26. First flow meter; 27. Second branch; 28. Third flow meter;

[0025] 30. Second pipeline; 31. Second conduit; 32. Second proportional valve; 33. Second flow meter;

[0026] 40. Mixing line; 41. Mixing pipe; 42. Mixer; 43. First gas supply line; 45. Second heater; 46. Second thermocouple; 47. Third heater; 48. Third thermocouple; 49. Second gas supply line;

[0027] 50. Steel strip. Detailed Implementation

[0028] To enable those skilled in the art to more clearly understand this application, the technical solutions in 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.

[0029] The furnace nose is a crucial piece of equipment in a hot-dip galvanizing production line. One end of the furnace nose connects to the outlet of the annealing furnace, while the other end extends below the surface of the molten zinc in the zinc bath. The strip steel passes through the furnace nose. Because the molten zinc generates zinc vapor at high temperatures, also known as zinc ash, some of this ash adheres to the inner wall of the furnace nose, and over time, accumulated zinc ash falls onto the strip steel. Other zinc ash adheres directly to the strip steel; both situations can cause zinc ash defects in the strip steel.

[0030] To address the zinc ash defect in strip steel production, the industry has installed humidifiers at the furnace nose. The humidifier uses nitrogen as the humidifier medium. Dry nitrogen is split into two streams: one stream flows directly into a mixing tank as dry nitrogen, while the other stream is moistened at the bottom of a water tank before entering the mixing tank as wet nitrogen. The dry and wet nitrogen are mixed in the mixing tank to form a mixed nitrogen gas, which is then introduced into the furnace nose. By adjusting the ratio of dry to wet nitrogen flow rates, the dew point within the furnace nose is controlled, thus suppressing zinc ash formation.

[0031] This approach has the following problems:

[0032] 1. Nitrogen is directly fed into the water tank below the liquid level. The nitrogen is wet and has high humidity, while the amount of wet nitrogen required to adjust the dew point in the furnace nose is small, making it difficult to control the accuracy of the wet nitrogen delivery.

[0033] 2. After prolonged use, the bottom of the water tank accumulates a lot of impurities. Nitrogen gas directly enters below the water surface, causing fluctuations in the water surface and stirring up the impurities. A small amount of impurities enters the furnace nose with the nitrogen gas, affecting the surface quality of the strip steel.

[0034] 3. The water level in the tank will drop as nitrogen is injected, requiring frequent water replenishment. Nitrogen below the water surface must overcome the water pressure, causing the pressure of the humidifying gas entering the furnace nose to decrease and become unstable.

[0035] To resolve the above technical issues, please refer to Figure 1 This application provides a furnace nose humidification system. The furnace nose humidification system includes a gas supply line 10, a first line 20, a second line 30, and a mixing line 40.

[0036] The gas supply line 10 includes a gas supply pipe 11, which has a gas supply outlet. The first line 20 includes a first branch 21, a second branch 27, a first proportional valve 22, a first heater 23, and a water tank 24. The first heater 23 can heat the water in the water tank 24 to generate water vapor in the water tank 24.

[0037] The first proportional valve 22 is connected in series with the first branch 21. The first branch 21 has a first branch inlet and a first branch outlet that are connected to the gas supply outlet. The first branch 21 is inserted into the water tank 24 and its depth can be within the range of 150mm±10mm, so that the first branch outlet is located on the liquid surface. The second branch 27 has a second branch inlet and a second branch outlet. The second branch 27 is inserted into the water tank 24 and its second branch inlet is located on the liquid surface. The first heater 23 is installed in the water tank 24 and is located below the liquid surface.

[0038] Taking nitrogen as an example, since the outlet of the first branch and the inlet of the second branch are located on the liquid surface, the nitrogen output from the outlet of the first branch can be humidified by the water vapor in the water tank 24. The humidified nitrogen can then be transported to the second branch 27 through the inlet of the second branch, thus allowing the nitrogen to be humidified by the water vapor. It should be noted that the outlet of the first branch and the inlet of the second branch are spaced apart within the water tank 24 to prevent nitrogen from entering the water tank 24 and being directly discharged through the inlet of the second branch.

[0039] The evaporation rate of water vapor in water tank 24 is controlled by controlling the first heater 23, thereby controlling the humidity of wet nitrogen gas in water tank 24. The higher the temperature of the water in water tank 24, the greater the amount of water vapor in water tank 24, and the greater the humidity of wet nitrogen gas on the liquid surface in water tank 24.

[0040] In related technologies, dry nitrogen is introduced into the water tank 24 below the liquid surface to increase the humidity of the dry nitrogen. The humidity of the wet nitrogen is high. When the amount of wet nitrogen introduced into the furnace nose is small, the amount of wet nitrogen required to adjust the dew point in the furnace nose can be met. This results in a small adjustment range of the first proportional valve 22 and makes it difficult to control the adjustment accuracy of the first proportional valve 22.

[0041] In this application, since the humidity of the wet nitrogen obtained by humidifying nitrogen with water vapor is low, in order to obtain the amount of wet nitrogen required in the furnace nose, the adjustment range of the water temperature when obtaining wet nitrogen can be expanded. In this way, the humidity of wet nitrogen can be adjusted within a larger water temperature adjustment range, which facilitates the control of the humidity of wet nitrogen and can improve the control accuracy of the humidity of wet nitrogen.

[0042] Since dry nitrogen does not need to be supplied below the liquid surface in water tank 24, it will not cause impurities at the bottom of water tank 24 to rise. Therefore, trace impurities will not enter the furnace nose with nitrogen and affect the surface quality of strip steel 50. At the same time, since nitrogen does not need to be supplied below the liquid surface, the water level in water tank 24 will not drop with the injection of nitrogen, so frequent water replenishment is not required.

[0043] The second pipeline 30 includes a second pipeline 31 and a second proportional valve 32 connected in series with the second pipeline 31. The second pipeline 31 has a second air inlet and a second air outlet, and the second air inlet is connected to the air supply outlet.

[0044] The mixing pipeline 40 includes a mixing pipe 41, which has a mixing inlet and a mixing outlet. The second branch outlet and the second outlet are respectively connected to the mixing inlet, and the mixing outlet is connected to the upper and lower surfaces of the strip 50 inside the furnace nose.

[0045] The flow rate ratio of dry and wet nitrogen gas delivered to the furnace nose from the mixing outlet can be adjusted by regulating the first proportional valve 22 and the second proportional valve 32. By adjusting the flow rate ratio of dry and wet nitrogen gas, the dew point inside the furnace nose can be controlled, the generation of zinc ash inside the furnace nose can be suppressed, zinc ash defects inside the furnace nose can be alleviated, and the surface quality of strip 50 can be improved. At the same time, the humidity of wet nitrogen gas can be regulated within a wide range of water temperature adjustment, improving the humidity control accuracy of wet nitrogen gas, thereby improving the control accuracy of dry and wet nitrogen gas in the furnace nose, improving the accuracy of dew point regulation inside the furnace nose, improving zinc ash defects, and improving the surface quality of strip 50.

[0046] To accurately control the ratio of dry to wet nitrogen in mixer 42, the first pipeline 20 includes a first flow meter 26, and the second pipeline 30 includes a second flow meter 33. The first flow meter 26 is connected in series to the first branch 21 and is located before the first proportional valve 22, and the second flow meter 33 is connected in series to the second pipeline 30 and is located before the second proportional valve 32. The amount of dry nitrogen in the first pipeline 20 is adjusted by the first flow meter 26. The dry nitrogen in the first pipeline 20 forms wet nitrogen through the water tank 24, and the amount of wet nitrogen delivered to the furnace nose can be controlled by the first flow meter 26. The amount of nitrogen in the second pipeline 30 is adjusted by the second flow meter 33. The nitrogen in the second pipeline 30 is dry nitrogen, and the amount of dry nitrogen delivered to the furnace nose can be controlled by the second flow meter 33. By controlling the ratio of dry to wet nitrogen delivered to the furnace nose through the first flow meter 26 and the second flow meter 33, the dew point inside the furnace nose is controlled, and the generation of zinc ash inside the furnace nose is suppressed.

[0047] It should be noted that the flow meter installed in the vertical pipeline of the furnace nose humidification system can be a rotor flow meter, and the flow meter installed in the horizontal pipeline can be a vortex flow meter. This facilitates the installation of the flow meter and also improves the measurement accuracy of the flow meter.

[0048] To accurately control the amount of water vapor in the water tank 24, the first pipeline 20 also includes a first thermocouple 25, which is installed inside the water tank 24 with its measuring end submerged below the liquid surface. The thermocouple can measure the water temperature in real time, allowing the determination of the amount of water vapor in the water tank 24, thus facilitating the adjustment of the humidity of the wet nitrogen. Based on the humidity requirements of the wet nitrogen, the heating temperature of the first heater 23 can be adjusted to raise the water temperature in the water tank 24, thereby increasing the amount of water vapor and consequently increasing the humidity of the wet nitrogen. The water tank 24 also has an inlet pipe 241 and a drain pipe 242. When the water temperature in the water tank 24 is high, hot water can be drained through the drain pipe 242 while cold water is introduced through the inlet pipe 241. By controlling the amount of hot water drained and the amount of cold water introduced, the water temperature in the water tank 24 can be adjusted, thereby controlling the amount of water vapor in the water tank 24.

[0049] In some embodiments, the first thermocouple 25 may also be installed in the water tank 24 and located below the liquid surface. The position of the first thermocouple 25 in the water tank 24 can be set according to the actual situation, and this application does not limit it.

[0050] To accurately control the amount of cold water supplied through the inlet pipe 241 in the water tank 24, the first pipeline 20 also includes a third flow meter 28, which measures the amount of cold water supplied through the inlet pipe 241. The relationship between the water temperature and the amount of cold water supplied through the inlet pipe 241 can be determined using the first thermocouple 25 and the third flow meter 28, facilitating the control of the amount of cold water supplied through the inlet pipe 241 based on the information obtained from the first thermocouple 25 and the third flow meter 28.

[0051] To ensure uniform mixing of dry and wet nitrogen, the mixing pipeline 40 also includes a mixer 42, which is connected in series to the mixing pipeline 41. The mixer 42 has a third inlet, and the second branch outlet and the second outlet are respectively connected to the third inlet of the mixer 42. The mixer 42 can promote uniform mixing of dry and wet nitrogen and prevent high-pressure gas from affecting the flow and mixing of low-pressure gas.

[0052] Because the temperature of the mixed gas is much lower than that of zinc vapor, the temperature difference will cause zinc vapor to condense when the mixed gas is introduced into the furnace nose. Therefore, the mixing pipeline 40 also includes a second heater 45. The mixing pipeline 40 also includes two first gas supply pipes 43, each connected in series with the second heater 45. The mixer 42 has a third gas outlet, and the first gas supply pipes 43 have a first gas inlet and a first gas outlet. The two first gas inlets are connected to the third gas outlet, and the two first gas outlets are connected to the upper and lower surfaces of the strip 50 near the furnace nose. The second heater 45 can heat the mixed gas output from the mixer 42 to a certain temperature to prevent zinc vapor from condensing due to the large temperature difference inside the furnace nose. This would prevent zinc ash from falling onto the strip 50 and forming defects, affecting the surface quality of the strip 50.

[0053] In order to accurately control the temperature of the mixed gas delivered to the furnace nose, the mixing pipeline 40 also includes two second thermocouples 46. The two second thermocouples 46 are connected in series to the two first gas delivery pipes 43 respectively. In this way, the temperature of the mixed gas can be detected in real time by the second thermocouples 46, and the temperature of the mixed gas can be adjusted in time by the second heater 45.

[0054] In some embodiments, please refer to Figure 2 The mixing pipeline 40 includes a third heater 47 and a third thermocouple 48. The mixing pipeline 40 includes two second gas supply pipes 49, each having a second gas supply inlet and a second gas supply outlet. The mixer 42, the third heater 47, and the third heater 48 are connected in series to the mixing pipeline 41. The two second gas supply inlets are respectively connected to the third thermocouple 48, and the two second gas supply outlets are respectively connected to the upper and lower surfaces of the strip 50 inside the furnace nose.

[0055] The gas supply pipeline 10 also includes a gas supply station 12 and a solenoid valve 13. The gas supply pipeline 11 has a gas inlet, and the gas supply station 12 is connected to the gas inlet. The gas supply station 12 and the solenoid valve 13 are connected in series to the gas supply pipeline 11. The gas supply station 12 can be used to supply nitrogen. The solenoid valve 13 can be used to control the supply of nitrogen in the first branch 21 and the second pipeline 31. Thus, the operation of the furnace nose humidification system can be controlled by controlling the opening and closing of the solenoid valve 13.

[0056] It should be noted that the humidifying medium in the furnace nose humidification system can be nitrogen or a nitrogen-hydrogen mixture, which can be set according to actual needs, and this application does not limit it.

[0057] The nitrogen output from gas supply station 12 has a high pressure, while the pressure inside the furnace nose is low. The higher pressure supplied to the furnace nose affects the atmosphere inside the furnace nose, thus requiring adjustment of the pressure of the dry and wet nitrogen supplied to the furnace nose. Therefore, gas supply line 10 also includes a pressure reducing valve 14, which is connected in series to gas supply line 11 and located after solenoid valve 13. Pressure reducing valve 14 can regulate the pressure of nitrogen output from gas supply station 12, reducing the nitrogen pressure and facilitating the entry of the mixed gas into the furnace nose.

[0058] In related technologies, delivering dry nitrogen to the liquid surface requires overcoming the water pressure and the pressure changes below the liquid surface. The pressure of wet nitrogen decreases and the decrease is unstable. Furthermore, as time passes, the liquid level in the water tank 24 drops, which also affects the degree of pressure decrease of the wet nitrogen. The pressure variables of dry and wet nitrogen are large and difficult to control, thus making it impossible to accurately control the pressure of wet nitrogen reaching the furnace nose.

[0059] In this application, since nitrogen passes above the liquid surface in the water tank 24, the nitrogen does not need to overcome the water pressure when passing through the water tank 24, and the pressure change is small. In this way, the pressure of wet nitrogen delivered to the furnace nose can be accurately controlled by the pressure reducing valve 14.

[0060] To improve the stability of nitrogen delivery, the gas supply line 10 may also include a pressure regulator 15. The pressure regulator 15 is installed in the gas supply line 11 and located after the pressure reducing valve 14. In this way, the pressure of nitrogen after pressure reduction can be stabilized in the pressure regulator 15, and then mixed through the first pipeline and the second pipeline 31, thereby improving the stability of nitrogen delivery in the first branch 21 and the second pipeline 31.

[0061] All pipes, water tanks 24, valves, etc. in this application may be made of stainless steel to prevent rust from contaminating the humidifying nitrogen gas. They may also be configured according to actual needs, and this application does not impose any restrictions.

[0062] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0063] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0064] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0065] Furthermore, the use of terms such as "first" and "second" in this application is 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 one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0066] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A humidification system for a furnace nose, characterized in that, The furnace nose humidification system includes: Gas supply pipeline, including a gas supply pipe having a gas supply outlet; The first pipeline includes a first branch, a second branch, a first proportional valve, a first heater, and a water tank. The first proportional valve is connected in series with the first branch. The first branch has a first branch inlet and a first branch outlet connected to the gas supply outlet. The first branch is inserted into the water tank and the first branch outlet is located on the liquid surface. The second branch has a second branch inlet and a second branch outlet. The second branch is inserted into the water tank and the second branch inlet is located on the liquid surface. The first heater is installed in the water tank and located below the liquid surface. The second pipeline includes a second pipe and a second proportional valve connected in series with the second pipe. The second pipe has a second air inlet and a second air outlet. The second air inlet is connected to the air supply outlet. A mixing pipeline includes a mixing pipe having a mixing inlet and a mixing outlet, a second branch outlet and a second outlet being connected to the mixing inlet, and the mixing outlet being connected to the furnace nose. The first pipeline further includes a first thermocouple, which is installed inside the water tank and has its measuring end extending below the liquid surface; or, the first thermocouple is located below the liquid surface.

2. The humidification system for the furnace nose according to claim 1, characterized in that, The mixing pipeline also includes a mixer connected in series to the mixing pipeline. The mixer has a third air inlet, and the second branch outlet and the second air outlet are respectively connected to the third air inlet.

3. The humidification system for the furnace nose according to claim 2, characterized in that, The mixer has a third gas outlet, and the mixing pipeline also includes two first gas supply pipes and two second heaters arranged in parallel. The first gas supply pipe has a first gas supply inlet and a first gas supply outlet that are connected to the third gas outlet. The first gas supply pipeline is connected in series with the second heaters, and the two first gas supply outlets are respectively connected to the furnace nose.

4. The humidification system for the furnace nose according to claim 3, characterized in that, The mixing pipeline also includes two second thermocouples, which are connected in series to the two first gas pipelines respectively.

5. The humidification system for the furnace nose according to claim 2, characterized in that, The mixing pipeline also includes a third heater and a third thermocouple. The mixer, the third heater and the third thermocouple are connected in series to the mixing pipeline. The mixing pipeline includes two second gas supply pipes. The second gas supply pipes have a second gas supply inlet and a second gas supply outlet connected to the third thermocouple. The two second gas supply outlets are respectively connected to the furnace nose.

6. The humidification system for the furnace nose according to claim 1, characterized in that, The first pipeline also includes a first flow meter, which is connected in series to the first branch and located before the first proportional valve.

7. The humidification system for the furnace nose according to claim 1, characterized in that, The second pipeline also includes a second flow meter, which is connected in series to the second pipeline and located before the second proportional valve.

8. The humidification system for the furnace nose according to claim 1, characterized in that, The gas supply pipeline also includes a gas supply station and a solenoid valve. The gas supply pipeline has a gas supply inlet. The gas supply station is connected to the gas supply inlet. The solenoid valve is connected in series to the gas supply pipeline.

9. The humidification system for the furnace nose according to claim 8, characterized in that, The gas supply pipeline also includes a pressure reducing valve and a pressure regulator, which are connected in series to the gas supply pipeline and located after the solenoid valve.

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