Intelligent zinc powder capturing system in strip continuous galvanizing production line

Abstract

The utility model relates to digitization zinc powder capturing system in strip continuous galvanizing production line, including annealing furnace and circulating pipeline, one end of circulating pipeline connects annealing furnace upper portion, the other end connects annealing furnace lower portion, furnace gas buffer tank, circulating frequency conversion fan, dryer, oxygen remover and heater are connected in proper order on circulating pipeline, and the temperature detection couple is set to the air inlet end of furnace gas buffer tank, and the temperature detection couple is set between zinc powder catcher and zinc powder concentration checker B, and the temperature detection couple, microoxygen analyzer and dew point analyzer are set in proper order on the circulating pipeline of heater export end, the utility model discloses a circulating pipeline is set on annealing furnace, and through furnace gas buffer tank, circulating frequency conversion fan, zinc powder catcher, zinc powder concentration check A, zinc powder concentration checker B, dryer, oxygen remover and heater on circulating pipeline to the treatment of furnace gas, can effectively eliminate the zinc powder in annealing furnace, can effectively improve product yield.

Description

Technical Field

[0001] This utility model relates to the field of galvanizing technology, specifically to an intelligent zinc powder capture system in a continuous galvanizing production line for plates and strips. Background Technology

[0002] In continuous galvanizing / aluminized zinc / galvanized aluminum-magnesium sheet and strip production lines, the sheet and strip undergo heat treatment in a high-temperature annealing furnace under a reducing atmosphere before entering a zinc pot containing molten zinc for surface coating. Zinc vapor evaporates from the molten zinc and enters the annealing furnace through the channel (furnace nose) between the zinc pot and the furnace. After prolonged operation, zinc powder contained in the zinc vapor accumulates in large quantities on the equipment within the annealing furnace, negatively impacting equipment lifespan and performance. Simultaneously, zinc powder also falls onto the sheet and strip surface, preventing effective adhesion of the zinc powder to the molten zinc upon entering the zinc pot, resulting in spot-like incomplete coating and affecting product quality. Therefore, controlling the entry of zinc powder into the furnace has always been a key technology affecting production in continuous galvanizing sheet and strip production lines.

[0003] Currently, the main preventative measure in various production lines on the market is to install an isolation baffle in the passage (furnace nose) between the zinc pot and the annealing furnace before the zinc powder enters. However, the baffle cannot completely block zinc vapor, and a large amount of zinc powder will still enter the annealing furnace. If not operated properly, the baffle can also scratch the strip, causing product defects. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides an intelligent zinc powder capture system for continuous strip galvanizing production lines, which can effectively eliminate zinc powder in the annealing furnace and effectively improve product yield.

[0005] To achieve the above objectives, this utility model provides an intelligent zinc powder capture system for a continuous strip galvanizing production line, comprising an annealing furnace and a circulation pipeline. One end of the circulation pipeline is connected to the upper part of the annealing furnace, and the other end is connected to the lower part of the annealing furnace. A furnace gas buffer tank, a circulating frequency converter, a zinc powder concentration detector A, a zinc powder capture device, a zinc powder concentration detector B, a dryer, a deaerator, and a heater are connected in series on the circulation pipeline. A temperature sensing coupler is installed at the inlet end of the furnace gas buffer tank, and a temperature sensing coupler is installed between the zinc powder capture device and the zinc powder concentration detector B. A temperature sensing coupler, a micro-oxygen analyzer, and a dew point analyzer are installed in sequence on the circulation pipeline at the heater outlet end. A pressure transmitter is installed inside the annealing furnace.

[0006] In addition, the intelligent zinc powder capture system in the continuous strip galvanizing production line proposed in the above embodiments of this utility model may also have the following additional technical features: As a further improvement of this utility model, the end of the circulating pipe near the upper part of the annealing furnace is equipped with an automatic shut-off valve, an automatic regulating valve, and an expansion joint.

[0007] As a further improvement of this utility model, the end of the circulating pipe near the lower part of the annealing furnace is equipped with an automatic shut-off valve and an expansion joint.

[0008] As a further improvement of this utility model, the end of the circulating pipe near the upper part of the annealing furnace is divided into two pipelines, which are respectively connected to the two sides of the upper part of the annealing furnace. Each pipeline is equipped with an automatic shut-off valve, an automatic regulating valve and an expansion joint.

[0009] As a further improvement of this utility model, the end of the circulating pipe near the lower part of the annealing furnace is divided into two pipelines, which are respectively connected to the two sides of the lower part of the annealing furnace. Each pipeline is equipped with an automatic shut-off valve and an expansion joint.

[0010] By means of the above solution, this utility model has at least the following advantages: Compared with conventional annealing furnaces, by setting up a circulation pipe on the annealing furnace and treating the furnace gas through the furnace gas buffer tank, circulation variable frequency fan, zinc powder catcher, zinc powder concentration checker A, zinc powder concentration checker B, dryer, deaerator and heater on the circulation pipe, zinc powder in the annealing furnace can be effectively eliminated, and the product yield can be effectively improved. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the intelligent zinc powder capture system in a continuous galvanizing production line for plates and strips. In the diagram: 1. Annealing furnace, 2. Circulation pipeline, 3. Furnace gas buffer tank, 4. Circulation variable frequency fan, 5. Zinc powder catcher, 6. Zinc powder concentration checker A, 7. Zinc powder concentration checker B, 8. Dryer, 9. Deaerator, 10. Heater, 11. Temperature sensing coupler, 12. Micro-oxygen analyzer, 13. Dew point analyzer, 14. Automatic shut-off valve, 15. Automatic regulating valve, 16. Expansion joint, 17. Pressure transmitter. Detailed Implementation

[0012] The intelligent zinc powder capture system in the continuous galvanizing production line of this utility model is described below with reference to the accompanying drawings.

[0013] In Embodiment 1 of this application, as Figure 1As shown, the intelligent zinc powder capture system (hereinafter referred to as "this invention") in this continuous galvanizing production line includes an annealing furnace 1, a circulation pipeline 2, a furnace gas buffer tank 3, a circulating variable frequency fan 4, a zinc powder capture device 5, a zinc powder concentration detector A6, a zinc powder concentration detector B7, a dryer 8, a deaerator 9, a heater 10, a temperature sensing coupler 11, a micro-oxygen analyzer 12, a dew point analyzer 13, an automatic shut-off valve 14, an automatic regulating valve 15, an expansion joint 16, and a pressure transmitter 17. One end of the circulation pipeline 2 is connected to the upper part of the annealing furnace 1, and the other end is connected to... Connected to the lower part of the annealing furnace 1, the circulating pipeline 2 is connected in series with a furnace gas buffer tank 3, a circulating variable frequency fan 4, a zinc powder concentration detector A6, a zinc powder catcher 5, a zinc powder concentration detector B7, a dryer 8, a deaerator 9, and a heater 10. A temperature sensing coupler 11 is installed at the inlet end of the furnace gas buffer tank 3. A temperature sensing coupler 11 is also installed between the zinc powder catcher 5 and the zinc powder concentration detector B7. At the outlet end of the heater 10, the circulating pipeline 2 is connected in series with a temperature sensing coupler 11, a micro-oxygen analyzer 12, and a dew point analyzer 13. A pressure transmitter 17 is installed inside the annealing furnace 1. To enable the controller to better control the circulating pipeline 2, an automatic shut-off valve 14, an automatic regulating valve 15, and an expansion joint 16 are installed at the upper end of the circulating pipeline 2 near the annealing furnace 1. An automatic shut-off valve 14 and an expansion joint 16 are installed at the lower end of the circulating pipeline 2 near the annealing furnace 1.

[0014] To further optimize the working efficiency of this application, and to enable the furnace gas in the annealing furnace 1 to circulate more evenly in the circulation pipe 2, the end of the circulation pipe 2 near the upper part of the annealing furnace 1 is divided into two pipes, which are respectively connected to the two sides of the upper part of the annealing furnace 1. Each pipe is equipped with an automatic shut-off valve 14, an automatic regulating valve 15, and an expansion joint 16. The end of the circulation pipe 2 near the lower part of the annealing furnace 1 is divided into two pipes, which are respectively connected to the two sides of the lower part of the annealing furnace 1. Each pipe is equipped with an automatic shut-off valve 14 and an expansion joint 16.

[0015] The furnace gas buffer tank 3 is used to stabilize the furnace pressure of the annealing furnace during the gas extraction process. The dryer 8 is used to remove trace amounts of moisture in the circulating gas. The deaerator 9 is used to remove trace amounts of oxygen in the circulating gas. The heater 10 is used to increase the furnace inlet temperature of the circulating gas and prevent the temperature of the annealing furnace 1 from dropping. The deaerator 9, dryer 8 and heater 10 are detected by the temperature detection thermocouple 11, micro-oxygen analyzer 12 and dew point analyzer 13, respectively. The PCL performs interlock control.

[0016] When in use, simply install the intelligent zinc powder capture system in the continuous galvanizing production line of strip and connect it to the corresponding control unit and circuit equipment to put it into operation.

[0017] When this utility model is used, its specific operation is as follows: The equipment controller controls the circulating variable frequency fan 4 to extract the furnace gas from the top of the annealing furnace 1. A pressure transmitter 17 senses the pressure inside the annealing furnace 1 and automatically calculates the total supply of reducing gas and the total amount of furnace gas to be extracted. This is to prevent the furnace from becoming negatively pressurized during gas extraction, which would disrupt the reducing atmosphere. The furnace gas is extracted from the annealing furnace 1 by the circulating variable frequency fan 4 and passes through an automatic shut-off valve 14, an automatic regulating valve 15, and an expansion joint 16. The temperature is detected by a temperature sensing coupler 11. The gas then passes through a furnace gas buffer tank 3, which stabilizes the furnace pressure during extraction. After passing through the circulating variable frequency fan 4, the gas enters a zinc powder concentration checker A6 to detect the zinc powder concentration. Finally, the gas enters a zinc powder trap 5. The extracted gas mainly contains nitrogen, hydrogen, and zinc vapor. After entering the zinc powder trap 5, the intelligent temperature control and cooling unit within the trap can achieve fully intelligent temperature control based on gas flow and temperature. After the cooling unit cools the furnace gas to the temperature at which zinc powder precipitates, the fine zinc particles precipitated fall into the discharge channel and are automatically discharged from the zinc powder catcher 5. Simultaneously, the furnace gas after zinc powder precipitation contains only nitrogen and hydrogen. After passing through the zinc powder concentration detector B7, dryer 8, deaerator 9, and heater 10, it is then reintroduced into the annealing furnace 1 via an automated furnace gas circulation system, thus achieving fully intelligent zinc powder removal.

[0018] The zinc powder concentration detector uses the principle of laser scattering. When a laser irradiates particles, particles of different sizes scatter light at different angles. The particle size distribution is calculated by detecting the distribution of scattered light. It detects zinc powder in the furnace gas before and after the zinc powder trap, monitors the zinc powder concentration in real time, and then feeds the data back to the PLC to automatically adjust the operating parameters of the trap.

[0019] The furnace gas buffer tank (3), circulating variable frequency fan (4), zinc powder catcher (5), zinc powder concentration checker (A6), zinc powder concentration checker (B7), dryer (8), deaerator (9), heater (10), temperature sensing coupler (11), micro-oxygen analyzer (12), dew point analyzer (13), automatic shut-off valve (14), automatic regulating valve (15), expansion joint (16), and pressure transmitter (17) are all connected to the control unit. The control unit has a built-in zinc powder data management system that uses data on the zinc powder concentration in the furnace gas at different temperatures for different plate and strip coating products to establish a data correlation between zinc liquid temperature, furnace gas temperature, furnace gas flow rate, and zinc powder concentration. During production, based on this data, the core parameters of the zinc powder capture system can be precisely set, effectively improving the operating efficiency of the catcher.

[0020] In summary, the intelligent zinc powder capture system in the continuous strip galvanizing production line of this utility model effectively eliminates zinc powder in the annealing furnace by setting up a circulation pipe 2 on the annealing furnace and treating the furnace gas through the furnace gas buffer tank 3, the circulating variable frequency fan 4, the zinc powder capture device 5, the zinc powder concentration checker A6, the zinc powder concentration checker B7, the dryer 8, the deaerator 9, and the heater 10 on the circulation pipe 2, which can effectively improve the product yield.

[0021] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A digital zinc powder capture system in a continuous strip galvanizing production line, comprising an annealing furnace (1) and a circulation pipeline (2), characterized in that, One end of the circulating pipe (2) is connected to the upper part of the annealing furnace (1), and the other end is connected to the lower part of the annealing furnace (1). The circulating pipe (2) is connected in series with the furnace gas buffer tank (3), the circulating variable frequency fan (4), the zinc powder concentration checker A (6), the zinc powder catcher (5), the zinc powder concentration checker B (7), the dryer (8), the deaerator (9), and the heater (10). A temperature sensing coupler (11) is installed at the gas inlet of the furnace gas buffer tank (3). A temperature sensing coupler (11) is installed between the zinc powder catcher (5) and the zinc powder concentration checker B (7). A temperature sensing coupler (11), a micro oxygen analyzer (12), and a dew point analyzer (13) are installed in sequence on the circulating pipe (2) at the outlet of the heater (10). A pressure transmitter (17) is installed inside the annealing furnace (1).

2. The intelligent zinc powder capture system in the continuous strip galvanizing production line according to claim 1, characterized in that, The circulating pipe (2) is equipped with an automatic shut-off valve (14), an automatic regulating valve (15) and an expansion joint (16) at the end near the upper part of the annealing furnace (1).

3. The intelligent zinc powder capture system in the continuous strip galvanizing production line according to claim 1, characterized in that, The circulating pipe (2) is equipped with an automatic shut-off valve (14) and an expansion joint (16) at one end near the lower part of the annealing furnace (1).

4. The intelligent zinc powder capture system in a continuous strip galvanizing production line according to claim 2 or 3, characterized in that, The circulating pipe (2) is divided into two pipes at the end near the upper part of the annealing furnace (1), which are connected to the upper two sides of the annealing furnace (1) respectively. Each pipe is equipped with an automatic shut-off valve (14), an automatic regulating valve (15) and an expansion joint (16).

5. The intelligent zinc powder capture system in a continuous strip galvanizing production line according to claim 2 or 3, characterized in that, The circulating pipe (2) is divided into two pipes at the end near the lower part of the annealing furnace (1), which are connected to the lower two sides of the annealing furnace (1) respectively. Each pipe is equipped with an automatic shut-off valve (14) and an expansion joint (16).

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