Pre-oxidation humidifying equipment applied to annealing furnace
By using pre -oxidation and humidification equipment in annealing furnace, combined with nitrogen and hot water vapor, the problem of alloy elements during high -strength steel annealing process was solved, and uniform pre -oxidation and product quality were improved by steel.
Patent Information
- Application Number
- CN202420955672.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-06
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-06
AI Technical Summary
During the annealing process of high-strength steel, alloy elements such as silicon and manganese precipitate in the annealing furnace, causing crystallization and nucleation of the steel plate surface, resulting in defects such as roller printing scratches and leakage of hot-dip galvanized steel plates, which are difficult to meet production requirements.
Provides a pre -oxidized humidification equipment applied to annealing furnace, including water tank components, water atomization devices, air intake devices and mixed air -out -in -air device. Tong the nitrogen through the air intake device, and the water atomization device is littically atomized into water vapor molecules, combined with nitrogen, and then passes through the annealing furnace by heating through a mixed air device to increase the molecular content in nitrogen. Oxidation.
By increasing the molecular content in nitrogen, the pre -oxidation with steel in the annealing furnace is more uniform, improve the quality of the product, and meet the requirements of the pre -oxygen pre -oxygenic process.
Smart Images
Figure CN222411704U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to annealing equipment, in particular to pre-oxidation humidification equipment applied to an annealing furnace. Background Art
[0002] At present, the production process of high-strength steel is to improve the production by adding alloy elements such as silicon and manganese into ordinary materials and combining them with corresponding annealing processes such as rapid cooling. Under this production process, since alloy elements such as silicon and manganese have oxygen-affinity properties, they will precipitate on the surface of the steel plate in the annealing furnace. These precipitated elements will crystallize and nucleate on the surface of the steel plate, causing many defects in subsequent production, such as roller scratches, leakage of hot-dip galvanized steel plates, etc., resulting in performance that cannot meet production requirements.
[0003] In order to solve the problem of alloy element precipitation caused by high-strength steel in the annealing furnace, two solutions are usually used. One of them is to introduce compressed air into the annealing furnace to oxidize the surface of the strip steel. However, since the oxygen introduced in this solution is difficult to control, it is still immature. The other solution is to use a humidifying device to inject a small amount of wet nitrogen into the annealing furnace, and the water vapor in the wet nitrogen is decomposed at high temperature to generate hydrogen and oxygen to achieve the purpose of strip micro-oxidation. However, due to the large volume of the annealing furnace, the humidification amount of the humidifying device is far from meeting the dew point control requirements in the furnace, and the control difficulty is very large. Therefore, a new solution is urgently needed to solve the problem of alloy element precipitation caused by high-strength steel in the annealing furnace. Summary of the invention
[0004] In order to solve the above technical problems, the embodiment of the utility model provides a pre-oxidation humidification device applied to an annealing furnace. The specific technical solution is as follows:
[0005] A pre-oxidation humidification device for an annealing furnace is provided, which includes a water tank assembly, a water atomization device, an air intake device and a mixed air outlet device. The water tank assembly includes a tank body and a water tank heater, and the water tank heater is arranged in the tank body. The water atomization device includes an atomization pump and a water atomization injection pipe, and the atomization pump is connected to the water atomization injection pipe. The water atomization injection pipe is located in the tank body, and the injection direction of the water atomization injection pipe is toward the bottom wall of the tank body. The air intake device includes a main air intake pipe, a first air intake pipe, an air intake control valve, and a first air intake regulating valve. The air intake control valve is arranged on the main air intake pipe, one end of the first air intake pipe is connected to the main air intake pipe, and the other end of the first air intake pipe is connected to the bottom of the tank body. The first air intake regulating valve is arranged on the first air intake pipe. The mixed gas outlet device is connected between the water tank assembly and the annealing furnace. The mixed gas outlet device has a first gas outlet pipe, a humidifying mixing heater and a second gas outlet pipe. One end of the first gas outlet pipe is connected to the upper part of the tank body, the other end of the first gas outlet pipe is connected to the air inlet end of the humidifying mixing heater, and the second gas outlet pipe is connected to the gas outlet end of the humidifying mixing heater.
[0006] In one embodiment, the water tank assembly further comprises a water tank temperature sensor, a water tank pressure sensor and a safety discharge valve, and the water tank temperature sensor, the water tank pressure sensor and the safety discharge valve are arranged on the tank body.
[0007] In one embodiment, the water tank assembly further comprises a drainage pipe, a drainage valve and a drainage control valve. One end of the drainage pipe is connected to the bottom of the tank body, and the drainage valve and the drainage control valve are arranged on the drainage pipe.
[0008] In one embodiment, the water atomization device also has a first water inlet pipe, a main water inlet pipe and a water inlet control valve. The water inlet control valve is arranged at the water inlet end of the main water inlet pipe. One end of the first water inlet pipe is connected to the water outlet end of the main water inlet pipe, and the other end of the first water inlet pipe is connected to the water atomization injection pipe. The atomization pump and the water atomization injection pipe are arranged on the first water inlet pipe.
[0009] In one embodiment, the water atomization device further comprises a pump flow meter, and the pump flow meter is arranged between the atomization pump of the first water inlet pipe and the water atomization injection pipe.
[0010] In one embodiment, the water atomization device further comprises a second water inlet pipe, one end of the second water inlet pipe is connected to the bottom of the tank body, and the other end of the second water inlet pipe is connected to one end of the first water inlet pipe.
[0011] In one embodiment, the air intake device further has a second air intake pipe and a second air intake regulating valve, one end of the second air intake pipe is connected to the main air intake pipe, the other end of the second air intake pipe is connected to the first air outlet pipe, and the second air intake regulating valve is arranged on the second air intake pipe.
[0012] In one embodiment, the intake device further has an intake pressure gauge, a first intake flow meter and a second intake flow meter. The intake pressure gauge is arranged on the main intake pipe, the first intake flow meter is arranged on the first intake pipe, and the second intake flow meter is arranged on the second intake pipe.
[0013] In one embodiment, the mixed gas outlet device further comprises a main heating pipe, a first heating pipe, a second heating pipe, a third heating pipe and a sub-inlet control valve, one end of the main heating pipe is connected to the second outlet pipe, one end of the first heating pipe, the second heating pipe and the third heating pipe are connected to the other end of the main heating pipe, the other end of the first heating pipe is connected to the upper layer of the annealing furnace, the other end of the second heating pipe is connected to the middle layer of the annealing furnace, the other end of the third heating pipe is connected to the lower layer of the annealing furnace, and the sub-inlet control valve is arranged on the first heating pipe, the second heating pipe and the third heating pipe.
[0014] In one of the embodiments, it also includes: a dew point sampling system, the dew point sampling system has an upper furnace port inlet sampling valve, a middle furnace port inlet sampling valve and a lower furnace port inlet sampling valve, the upper furnace port inlet sampling valve is connected to the upper layer of the annealing furnace, the upper furnace port inlet sampling valve corresponds to the first heating pipeline, the middle furnace port inlet sampling valve is connected to the middle layer of the annealing furnace, the middle furnace port inlet sampling valve corresponds to the second heating pipeline, the lower furnace port inlet sampling valve is connected to the lower layer of the annealing furnace, and the lower furnace port inlet sampling valve corresponds to the third heating pipeline.
[0015] In the embodiment of the utility model, nitrogen is introduced into the tank body through the air intake device, and at the same time, the atomizing pump of the water atomizing device atomizes hot water into water vapor molecules through the atomizing injection pipe. The nitrogen and the atomized water vapor molecules are tightly combined in the tank body, and then the mixed gas is heated by the humidifying mixing heater of the mixed gas outlet device and then introduced into the annealing furnace. In this way, the water molecule content in the nitrogen can be greatly increased, the pre-oxidation of the strip in the annealing furnace can be made more uniform, and the product quality can be improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:
[0017] Figure 1 It is a schematic diagram of the use of a pre-oxidation humidification device applied to an annealing furnace according to an embodiment of the utility model. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] In the description of the present invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0020] In addition, although the terms “first”, “second”, etc. are used herein to describe different elements, such terms are merely used to distinguish elements or operations described with the same technical terms.
[0021] See also Figure 1 , which is a schematic diagram of the use of a pre-oxidation humidification device applied to an annealing furnace according to an embodiment of the utility model. As shown in the figure, the pre-oxidation humidification device 100 applied to the annealing furnace includes a water tank assembly 1, a water atomization device 2, an air intake device 3 and a mixed air outlet device 4. The water tank assembly 1 has a tank body 11 and a water tank heater 12. The water tank heater 12 is arranged in the tank body 11. The water atomization device 2 has an atomization pump 21 and a water atomization injection pipe 22. The atomization pump 21 is connected to the water atomization injection pipe 22. The water atomization injection pipe 22 is located in the tank body 11, and the injection direction of the water atomization injection pipe 22 is toward the bottom wall of the tank body 11. The atomization pump 21 atomizes the hot water into water vapor molecules through the water atomization injection pipe 22 and sprays them toward the bottom wall of the tank body 11. At the same time, some water vapor molecules will accumulate on the tank body 11 to form accumulated water, and the water tank heater 12 is located in the accumulated water to heat the accumulated water.
[0022] As mentioned above, the air intake device 3 has a main air intake pipe 31, a first air intake pipe 32, an air intake control valve 33, and a first air intake regulating valve 34. The air intake control valve 33 is arranged on the main air intake pipe 31. One end of the first air intake pipe 32 is connected to the main air intake pipe 31, and the other end of the first air intake pipe 32 is connected to the bottom of the tank body 11. The first air intake regulating valve 34 is arranged on the first air intake pipe 32. The mixed air outlet device 4 is connected between the water tank assembly 1 and the annealing furnace S. The mixed air outlet device 4 has a first air outlet pipe 41, a humidifying mixing heater 42 and a second air outlet pipe 43. One end of the first air outlet pipe 41 is connected to the upper part of the tank body 11, the other end of the first air outlet pipe 41 is connected to the air intake end of the humidifying mixing heater 42, and the second air outlet pipe 43 is connected to the air outlet end of the humidifying mixing heater 42.
[0023] When the pre-oxidation humidification device 100 of the present embodiment is used for an annealing furnace, the atomizing pump 21 of the water atomizing device 2 atomizes the hot water into water vapor molecules through the water atomizing injection pipe 22 and sprays them toward the bottom wall of the tank body 11. At the same time, some water vapor molecules accumulate and spray toward the bottom of the tank body 11 to form accumulated water, and the water tank heater 12 heats the accumulated water. At the same time, the air intake control valve 33 is opened to allow (dry) nitrogen to enter the first air intake pipe 32, and the first air intake regulating valve 34 is controlled to adjust the air intake volume of the first air intake pipe 32, so that the nitrogen is passed into the bottom of the tank body 11. After the nitrogen floats out of the accumulated water, it will be tightly combined with the atomized water vapor molecules in the tank body 11, thereby increasing the water molecule content in the nitrogen. Then the wet nitrogen (mixed gas) enters the humidifying mixing heater 42 through the first gas outlet pipe 41 of the mixed gas outlet device 4. After the humidifying mixing heater 42 heats the mixed gas, the mixed gas is passed into the annealing furnace S through the second gas outlet pipe 43. In this way, the pre-oxidation and humidification effect of the steel strip S1 in the annealing furnace S can be quickly responded to, so that the pre-oxidation of the steel strip S1 in the annealing furnace S is more uniform, and the product quality is improved. The dew point of the annealing pre-oxidation humidification of the pre-oxidation humidification device 100 applied to the annealing furnace in this embodiment can be controlled to -35°C~+10°C, meeting the pre-oxidation process requirements of the ultra-high strength steel strip in the annealing furnace.
[0024] The following is a further detailed description of the structure of the water tank assembly 1, the water atomizing device 2, the air intake device 3 and the mixed air outlet device 4: the water tank assembly 1 further comprises a water tank temperature sensor 13, a water tank pressure sensor 14 and a safety discharge valve 15. The water tank temperature sensor 13, the water tank pressure sensor 14 and the safety discharge valve 15 are arranged on the tank body 11. Figure 1 As shown, the water tank temperature sensor 13, the water tank pressure sensor 14 and the safety discharge valve 15 are sequentially arranged on the side wall of the tank body 11 from bottom to top. The water tank temperature sensor 13 is used to monitor the temperature in the tank body 11, the water tank pressure sensor 14 is used to monitor the pressure in the tank body 11, and the safety discharge valve 15 is used to monitor the water level in the tank body 11. In this embodiment, the water tank assembly 1 further has a drainage pipe 16, a drainage valve 17 and a drainage control valve 18. One end of the drainage pipe 16 is connected to the bottom of the tank body 11. The drainage valve 17 and the drainage control valve 18 are arranged on the drainage pipe 16. The drainage control valve 18 controls the on-off of the drainage pipe 16 to control the drainage pipe 16 to drain the tank body 11, and the drainage valve 17 controls the flow rate of the drainage pipe 16.
[0025] The water atomization device 2 also has a first water inlet pipe 23, a main water inlet pipe 24 and a water inlet control valve 25. The water inlet control valve 25 is arranged at the water inlet end of the main water inlet pipe 24. One end of the first water inlet pipe 23 is connected to the water outlet end of the main water inlet pipe 24, and the other end of the first water inlet pipe 23 is connected to the water atomization injection pipe 22. The atomization pump 21 is arranged on the first water inlet pipe 23. The water inlet control valve 25 controls the hot water to pass into the main water inlet pipe 24 and the first water inlet pipe 23 in sequence, and the atomization pump 21 atomizes the hot water into water vapor molecules through the water atomization injection pipe 22 and sprays them to the bottom wall of the tank body 11. In this embodiment, the water atomization device 2 further has a pump flowmeter 26, which is arranged between the atomization pump 21 and the water atomization injection pipe 22 of the first water inlet pipe 23. The pump flowmeter 26 is used to measure and control the flow rate of the hot water pumped in by the atomization pump 21. The water atomizing device 2 further comprises a second water inlet pipe 27, one end of which is connected to the bottom of the tank 11, and the other end of which is connected to one end of the first water inlet pipe 23. The second water inlet pipe 27, the first water inlet pipe 23 and the atomizing pump 21 form a hot water circulation.
[0026] The air intake device 3 further comprises a second air intake pipe 35 and a second air intake regulating valve 36. One end of the second air intake pipe 35 is connected to the main air intake pipe 31, and the other end of the second air intake pipe 35 is connected to the first air outlet pipe 41. The second air intake regulating valve 36 is arranged on the second air intake pipe 35. After the air intake control valve 33 is opened, dry nitrogen will enter the first air intake pipe 32 and the second air intake pipe 35 at the same time. The second air intake regulating valve 36 adjusts the air intake amount of the second air intake pipe 35, and passes the dry nitrogen into the first air outlet pipe 41. The dry nitrogen and the wet nitrogen in the tank body 11 enter the humidification mixing heater 42 through the first air outlet pipe 41 for mixing and heating. In this embodiment, the air intake device 3 further comprises an air intake pressure gauge 37, a first air intake flow meter 38 and a second air intake flow meter 39. The air intake pressure gauge 37 is arranged on the main air intake pipe 31. The air intake pressure gauge 37 is used to monitor the air intake pressure of the main air intake pipe 31. The first intake air flow meter 38 is disposed on the first intake air pipeline 32, and the second intake air flow meter 39 is disposed on the second intake air pipeline 35. The first intake air flow meter 38 and the second intake air flow meter 39 are used to measure and control the nitrogen flow of the first intake air pipeline 32 and the second intake air pipeline 35 respectively.
[0027] The mixed gas outlet device 4 further comprises a main heating pipeline 44, a first heating pipeline 45, a second heating pipeline 46, a third heating pipeline 47 and a sub-intake control valve 48. One end of the main heating pipeline 44 is connected to the second gas outlet pipeline 43. One ends of the first heating pipeline 45, the second heating pipeline 46 and the third heating pipeline 47 are connected to the other end of the main heating pipeline 44. The other end of the first heating pipeline 45 is connected to the upper layer of the annealing furnace S, the other end of the second heating pipeline 46 is connected to the middle layer of the annealing furnace S, and the other end of the third heating pipeline 47 is connected to the lower layer of the annealing furnace S. The sub-intake control valve 48 is arranged on the first heating pipeline 45, the second heating pipeline 46 and the third heating pipeline 47. The mixed gas outlet device 4 controls the gas flow of the first heating pipeline 45, the second heating pipeline 46 and the third heating pipeline 47 through the sub-intake control valve 48. The mixed gas outlet device 4 evenly introduces the wet nitrogen into the entire annealing furnace S through the first heating pipe 45, the second heating pipe 46, and the third heating pipe 47, so that the pre-oxidation of the strip steel S1 is more uniform.
[0028] In this embodiment, the pre-oxidation humidification equipment 100 applied to the annealing furnace also includes a dew point sampling system 5. The dew point sampling system 5 has an upper furnace port inlet sampling valve 51, a middle furnace port inlet sampling valve 52 and a lower furnace port inlet sampling valve 53. The upper furnace port inlet sampling valve 51 is connected to the upper layer of the annealing furnace S, and the upper furnace port inlet sampling valve 51 corresponds to the first heating pipeline 45. The middle furnace port inlet sampling valve 52 is connected to the middle layer of the annealing furnace S, and the middle furnace port inlet sampling valve 52 corresponds to the second heating pipeline 46. The lower furnace port inlet sampling valve 53 is connected to the lower layer of the annealing furnace S, and the lower furnace port inlet sampling valve 53 corresponds to the third heating pipeline 47. The pre-oxidation humidification equipment 100 applied to the annealing furnace in this embodiment is more conducive to the control of the pre-oxidation humidification dew point by installing dew point sampling ports on the upper, middle and lower layers of the annealing furnace S.
[0029] In summary, the utility model provides a pre-oxidation humidification device applied to an annealing furnace, wherein nitrogen is introduced into a tank body through an air intake device, and at the same time, an atomizing pump of a water atomizing device atomizes hot water into water vapor molecules through an atomizing injection pipe, and the nitrogen and the atomized water vapor molecules are tightly combined in the tank body, and then the mixed gas is heated by a humidifying mixing heater of a mixed gas outlet device and then introduced into the annealing furnace, thereby greatly increasing the water molecule content in the nitrogen, making the pre-oxidation of the strip in the annealing furnace more uniform, and improving product quality.
[0030] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.
[0031] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.
Claims
1. A pre-oxidation humidification device applied to an annealing furnace, characterized in that: include: A water tank assembly comprises a tank body and a water tank heater, wherein the water tank heater is disposed in the tank body; A water atomization device, comprising an atomization pump and a water atomization injection pipe, wherein the atomization pump is connected to the water atomization injection pipe, the water atomization injection pipe is located in the tank body, and the injection direction of the water atomization injection pipe is toward the bottom wall of the tank body; An air intake device, comprising a main air intake pipeline, a first air intake pipeline, an air intake control valve, and a first air intake regulating valve, wherein the air intake control valve is arranged on the main air intake pipeline, one end of the first air intake pipeline is connected to the main air intake pipeline, the other end of the first air intake pipeline is connected to the bottom of the tank body, and the first air intake regulating valve is arranged on the first air intake pipeline; A mixed gas outlet device is connected between the water tank assembly and the annealing furnace, and comprises a first gas outlet pipe, a humidifying mixing heater and a second gas outlet pipe, one end of the first gas outlet pipe is connected to the upper part of the tank body, the other end of the first gas outlet pipe is connected to the air inlet end of the humidifying mixing heater, and the second gas outlet pipe is connected to the air outlet end of the humidifying mixing heater.
2. The pre-oxidation humidification equipment for annealing furnace according to claim 1, characterized in that: The water tank assembly further comprises a water tank temperature sensor, a water tank pressure sensor and a safety discharge valve, wherein the water tank temperature sensor, the water tank pressure sensor and the safety discharge valve are arranged on the tank body.
3. The pre-oxidation humidification equipment for annealing furnace according to claim 1, characterized in that: The water tank assembly further comprises a drainage pipe, a drainage valve and a drainage control valve. One end of the drainage pipe is connected to the bottom of the tank body, and the drainage valve and the drainage control valve are arranged on the drainage pipe.
4. The pre-oxidation humidification equipment for annealing furnace according to claim 1, characterized in that: The water atomization device also has a first water inlet pipe, a main water inlet pipe and a water inlet control valve. The water inlet control valve is arranged at the water inlet end of the main water inlet pipe. One end of the first water inlet pipe is connected to the water outlet end of the main water inlet pipe, and the other end of the first water inlet pipe is connected to the water atomization injection pipe. The atomization pump is arranged on the first water inlet pipe.
5. The pre-oxidation humidification equipment used in an annealing furnace according to claim 4, characterized in that: The water atomization device further comprises a pump flow meter, and the pump flow meter is arranged between the atomization pump of the first water inlet pipe and the water atomization injection pipe.
6. The pre-oxidation humidification equipment for annealing furnace according to claim 4, characterized in that: The water atomization device further comprises a second water inlet pipe, one end of which is connected to the bottom of the tank body, and the other end of which is connected to one end of the first water inlet pipe.
7. The pre-oxidation humidification equipment for annealing furnace according to claim 1, characterized in that: The air intake device further comprises a second air intake pipe and a second air intake regulating valve, one end of the second air intake pipe is connected to the main air intake pipe, the other end of the second air intake pipe is connected to the first air outlet pipe, and the second air intake regulating valve is arranged on the second air intake pipe.
8. The pre-oxidation humidification equipment used in an annealing furnace according to claim 7, characterized in that: The air intake device further comprises an air intake pressure gauge, a first air intake flow meter and a second air intake flow meter. The air intake pressure gauge is arranged on the main air intake pipe, the first air intake flow meter is arranged on the first air intake pipe, and the second air intake flow meter is arranged on the second air intake pipe.
9. The pre-oxidation humidification equipment used in an annealing furnace according to claim 1, characterized in that: The mixed gas outlet device further comprises a main heating pipe, a first heating pipe, a second heating pipe, a third heating pipe and a sub-inlet control valve, one end of the main heating pipe is connected to the second outlet pipe, one end of the first heating pipe, the second heating pipe and the third heating pipe are connected to the other end of the main heating pipe, the other end of the first heating pipe is connected to the upper layer of the annealing furnace, the other end of the second heating pipe is connected to the middle layer of the annealing furnace, the other end of the third heating pipe is connected to the lower layer of the annealing furnace, and the sub-inlet control valve is arranged on the first heating pipe, the second heating pipe and the third heating pipe.
10. The pre-oxidation humidification equipment used in an annealing furnace according to claim 9, characterized in that: Also includes: A dew point sampling system, the dew point sampling system comprises an upper furnace port inlet sampling valve, a middle furnace port inlet sampling valve and a lower furnace port inlet sampling valve, the upper furnace port inlet sampling valve is connected to the upper layer of the annealing furnace, the upper furnace port inlet sampling valve corresponds to the first heating pipeline, the middle furnace port inlet sampling valve is connected to the middle layer of the annealing furnace, the middle furnace port inlet sampling valve corresponds to the second heating pipeline, the lower furnace port inlet sampling valve is connected to the lower layer of the annealing furnace, and the lower furnace port inlet sampling valve corresponds to the third heating pipeline.