A device for preventing fouling of cooling water nozzles in a steel rolling plant
By introducing a compressed air purging system into the cooling water system, the problem of scaling on the cooling water nozzles under high-temperature conditions was solved, thus achieving nozzle anti-clogging and product quality stability.
Patent Information
- Application Number
- CN202522067661.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-25
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-09-25
AI Technical Summary
During the steel rolling process, cooling water nozzles are prone to scaling and blockage in high-temperature environments, which affects product quality.
A compressed air delivery pipe and pneumatic regulating valve system are used to purge the cooling water nozzles with compressed air, preventing water stagnation, increasing water flow rate, and reducing scaling.
It effectively prevents scale buildup on cooling water nozzles, ensures normal cooling water spraying, avoids degradation of product surface quality, and has a simple structure and is easy to use.
Smart Images
Figure CN224926326U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a device for preventing scale buildup on cooling water nozzles in steel rolling equipment, and belongs to the technical field of steel rolling cooling water equipment. Background Technology
[0002] Water usage is a crucial process in steel rolling, and its condition directly impacts process control and the surface quality of finished strips and sheets. Because steel rolling takes place in a high-temperature environment, impurities in the water used in the equipment accumulate rapidly, frequently clogging the cooling water nozzles. Cleaning clogged nozzles is difficult, and failure to clean them promptly can easily lead to a decline in product quality.
[0003] Currently, during the rolling process, cooling water between the mill stands is sprayed onto the strip through nozzles on the manifold to provide temperature control for the rolling process. During operation, the cooling water valves need to be frequently opened and closed. After the valves are closed, the water remaining in the manifold loses pressure and flows slowly through the nozzles by its own weight. In the high-temperature environment, the residual water evaporates rapidly and easily forms scale on the nozzles, which then clogs them. The causes of clogging and scaling in other nozzles in the steel rolling process are similar. Therefore, it is essential to improve the cooling water nozzles to reduce the scaling rate and prevent the cooling water nozzles from failing to spray properly due to scaling, thus affecting the surface quality of the product. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a device for preventing scale buildup on cooling water nozzles in steel rolling equipment. This anti-scaling device can prevent scale and blockage of cooling water nozzles in high-temperature environments, and avoid the decline in product surface quality caused by the inability of cooling water nozzles to spray normally.
[0005] The technical solution to the above technical problem is: A device for preventing scaling of cooling water nozzles in steel rolling equipment includes a main cooling water supply pipe, an upper water supply pipe, a lower water supply pipe, an upper cooling water manifold, a lower cooling water manifold, a pneumatic cooling water regulating valve, and cooling water nozzles. The main cooling water supply pipe is connected to the inlet ends of the upper and lower cooling water manifolds via the upper and lower water supply pipes, respectively. The pneumatic cooling water regulating valve is installed in the main cooling water supply pipe. The device also includes a compressed air supply pipe, a manual ball valve, a solenoid valve, and an air check valve. The inlet end of the compressed air supply pipe is connected to the compressed air pipeline in the workshop, and the outlet end of the compressed air supply pipe is connected to the upper water supply pipe. The manual ball valve, the solenoid valve, and the air check valve are sequentially installed in the pipe body from the inlet end to the outlet end of the compressed air supply pipe.
[0006] The aforementioned device for preventing scaling of cooling water nozzles in steel rolling equipment comprises a cooling water manifold consisting of a spray pipe and a purge pipe. The spray pipe and purge pipe are placed parallel to each other, with the purge pipe positioned above the spray pipe. One end of the purge pipe is connected to the upper water supply pipe via a flange, and the upper part of the purge pipe is connected to the outlet end of the compressed air supply pipe. The lower part of the purge pipe is connected to the upper end of the spray pipe via multiple connecting pipes. Multiple cooling water nozzles are installed on the lower part of the spray pipe, and the multiple cooling water nozzles are evenly distributed along the length of the spray pipe.
[0007] The aforementioned device for preventing scale buildup on cooling water nozzles in steel rolling equipment includes a cooling water check valve and an adjustable pressure-holding valve installed in the pipe body connecting the upper water supply pipe and the purge pipe of the upper cooling water manifold. The cooling water check valve is located near the water inlet end of the purge pipe.
[0008] The beneficial effects of this utility model are: The main cooling water supply pipe of this invention supplies cooling water to the upper and lower cooling water manifolds via an upper and lower water supply pipe, respectively. The flow rate of the cooling water is controlled by a pneumatic regulating valve. Cooling water nozzles installed on the upper and lower cooling water manifolds can spray water to cool the rolled steel plates. The outlet of the compressed air supply pipe is connected to the upper water supply pipe, which can purge the cooling water nozzles on the upper cooling water manifold to prevent cooling water from accumulating and forming scale. The manual ball valve, solenoid switch valve, and air check valve in the compressed air supply pipe can control the opening and closing of the compressed air supply. The cooling water check valve and adjustable pressure holding valve installed in the pipe connecting the upper water supply pipe and the upper cooling water manifold can prevent compressed air from entering the upper water supply pipe.
[0009] This utility model has a simple structure and is easy to use. It can pressurize the residual water in the cooling water manifold by compressed air, which increases the water flow rate and allows the residual water in the cooling water manifold to be drained quickly. This greatly reduces the rate of scaling near the cooling water nozzles in high-temperature environments and avoids the impact on product quality caused by the inability to clean the cooling water nozzles in time. It has good performance and strong versatility. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the cooling water manifold.
[0011] The following are the markings in the diagram: 1. Main cooling water supply pipe; 2. Upper water supply pipe; 3. Lower water supply pipe; 4. Upper cooling water manifold; 5. Lower cooling water manifold; 6. Pneumatic cooling water regulating valve; 7. Cooling water nozzle; 8. Rolling mill center line; 9. Compressed air supply pipe; 10. Manual ball valve; 11. Electromagnetic switch valve; 12. Air check valve; 13. Spray pipe; 14. Purge pipe; 15. Connecting pipe; 16. Cooling water check valve; 17. Adjustable pressure holding valve. Detailed Implementation
[0012] This utility model consists of a cooling water main delivery pipe 1, an upper water delivery pipe 2, a lower water delivery pipe 3, an upper cooling water manifold 4, a lower cooling water manifold 5, a cooling water pneumatic regulating valve 6, a cooling water nozzle 7, a compressed air delivery pipe 9, a manual ball valve 10, an electromagnetic switch valve 11, an air check valve 12, a cooling water check valve 16, and an adjustable pressure holding valve 17.
[0013] Figure 1 The display shows that the main cooling water supply pipe 1 is connected to the inlet ends of the upper cooling water manifold 4 and the lower cooling water manifold 5 via the upper water supply pipe 2 and the lower water supply pipe 3, respectively. A pneumatic cooling water regulating valve 6 is installed in the main cooling water supply pipe 1. The main cooling water supply pipe 1 supplies cooling water to the upper cooling water manifold 4 and the lower cooling water manifold 5 via the upper water supply pipe 2 and the lower water supply pipe 3, respectively. The pneumatic cooling water regulating valve 6 can control the flow rate of the supplied cooling water. Cooling water nozzles 7 installed on the upper cooling water manifold 4 and the lower cooling water manifold 5 can spray water to cool the rolled steel plates along the rolling centerline 8 of the rolling mill.
[0014] Figure 1 As shown, in order to prevent scale buildup on the cooling water nozzles, this utility model adds a compressed air delivery pipe 9, a manual ball valve 10, a solenoid switch valve 11, and an air check valve 12. Compressed air is used to purge the cooling water nozzles on the cooling water manifold 4, preventing cooling water from accumulating in the cooling water nozzles 7 and causing scale buildup. At the same time, the manual ball valve 10, solenoid switch valve 11, and air check valve 12 installed in the compressed air delivery pipe 9 can control the opening and closing of the compressed air.
[0015] Figure 1 The display shows that the inlet end of the compressed air delivery pipe 9 is connected to the compressed air pipeline in the workshop, and the outlet end of the compressed air delivery pipe 9 is connected to the upper water supply pipe 2. A manual ball valve 10, a solenoid switch valve 11, and an air check valve 12 are sequentially installed in the pipe body from the inlet end to the outlet end of the compressed air delivery pipe 9. The compressed air pressure provided by the compressed air pipeline 9 is 0.55 MPa, which is high enough to purge residual water from the cooling water manifold 4. The air check valve 12 serves a protective function, preventing water from entering the compressed air delivery pipe 9 when the solenoid switch valve 11 cannot close tightly and the compressed air pressure is lower than the water pressure.
[0016] Figure 1The display shows that a cooling water check valve 16 and an adjustable pressure-holding valve 17 are installed in the upper water supply pipe 2 connected to the upper cooling water manifold 4. The cooling water check valve 16 and the adjustable pressure-holding valve 17 form a water circuit valve group. The cooling water check valve 16 serves a protective and water-saving function, preventing the adjustable pressure-holding valve 17 from failing to close tightly and preventing compressed air from flowing from the compressed air supply pipe 9 into the upper water supply pipe 2 when the compressed air pressure is greater than the water pressure. It also prevents residual water in the lower cooling water manifold 5 from being blown out, thus saving water. The adjustable pressure-holding valve 17 has an opening pressure of 0.1 MPa. Its function is to prevent residual water in the upper water supply pipe 2 from flowing into the upper cooling water manifold 4, where unpressurized water cannot be completely drained, affecting the anti-scaling effect. If the upper cooling water manifold 4 is the highest point in the water system, this factor is not necessary.
[0017] Figure 2 The cooling water manifold 4 is shown to consist of a spray pipe 13 and a purge pipe 14, which are placed in parallel with the spray pipe 13 above it. The lower part of the purge pipe 14 is connected to the upper end of the spray pipe 13 via multiple connecting pipes 15. Multiple cooling water nozzles 7 are installed on the lower part of the spray pipe 13, and the multiple cooling water nozzles 7 are evenly distributed along the length of the spray pipe 13.
[0018] Figure 2 The upper part of the purge pipe 14 is connected to the outlet of the compressed air delivery pipe 9. Compressed air enters the purge pipe 14 and then enters the spray pipe 13 through the connecting pipe 15 to purge the cooling water nozzle 7 at the bottom of the spray pipe 13, thus preventing scale buildup on the cooling water nozzle 7.
[0019] Figure 2 The purging pipe 14 is connected to the upper water supply pipe 2 via a flange. The upper water supply pipe 2 is equipped with a cooling water check valve 16 and an adjustable pressure holding valve 17.
[0020] The process of using this utility model: When the cooling water manifold 4 is the highest point of the cooling water circuit between the mill stands, this utility model does not require the installation of an adjustable pressure-holding valve 17. Its usage process is as follows: Initially, both the electromagnetic switch valve 11 and the cooling water pneumatic regulating valve 6 are closed. During rolling, the cooling water pneumatic regulating valve 6 is opened, and cooling spray water sprays onto the strip to control the rolling temperature. After rolling, the cooling water regulating valve 6 is closed and the electromagnetic switch valve 11 is opened. Compressed air enters the cooling water manifold 4 to pressurize the residual water. The water flow through the cooling water nozzle 7 is greatly accelerated, which destroys the conditions for scaling. After 10 seconds, the residual water is drained, and the electromagnetic switch valve 11 is closed. The purging time can be adjusted according to the actual situation to restore the initial state.
[0021] When the cooling water manifold 4 is not the highest point of the cooling water circuit between the mill stands, this utility model requires the installation of an adjustable pressure-holding valve 17, the usage process of which is as follows: Initially, both the electromagnetic switch valve 11 and the cooling water pneumatic regulating valve 6 are closed. The water pressure inside the upper water supply pipe 2 is less than the opening pressure of the adjustable pressure holding valve 17, resulting in a sealed water state. During rolling, the cooling water pneumatic regulating valve 6 is opened, and the water pressure inside the upper water supply pipe 2 is greater than the opening pressure of the adjustable pressure holding valve 17. Cooling water enters the upper cooling water manifold 4 through the adjustable pressure holding valve 17, and the cooling spray water sprays the strip to control the rolling temperature. After rolling, the cooling water pneumatic regulating valve 6 is closed and the electromagnetic switch valve 11 is opened. The water pressure inside the upper water supply pipe 2 is less than the opening pressure of the adjustable pressure holding valve 17, and the cooling water is sealed inside the upper water supply pipe 2. At the same time, compressed air enters the upper cooling water manifold 4 to pressurize the residual water. The speed at which the water flows through the cooling water nozzle 7 is greatly increased, which destroys the conditions for scaling. After 10 seconds, the residual water is drained, the electromagnetic switch valve 11 is closed, and the purging time can be adjusted according to the actual situation to restore the initial state.
[0022] An embodiment of this utility model is as follows: The spray pipe 13 of the cooling water manifold 4 has a diameter of 273 mm and a length of 2676 mm, the purge pipe 14 has a diameter of 159 mm and a length of 2781 mm, and the connecting pipe 15 has a diameter of 89 mm and a length of 150 mm. The model of the cooling water pneumatic regulating valve 6 is MASCOT-GFLO, and the size is DN200, PN16. The model number of the cooling water nozzle 7 is 665.043.17; The compressed air delivery pipe 9 has a diameter of 32mm and a length of 500mm; The manual ball valve 10 has the model number Q11F-16P and the size DN25. The model of the electromagnetic switch valve 11 is: 2W250-25-DC24V, and the size is: DN25; The model number of the air check valve 12 is H41W-16P, and its size is DN25. The model number of the cooling water check valve 16 is H41W-16, and its size is DN250. The adjustable pressure holding valve 17 has the model number 500X-16Q and the size DN250.
Claims
1. A device for preventing scaling of cooling water nozzles in steel rolling equipment, comprising a main cooling water supply pipe (1), an upper water supply pipe (2), a lower water supply pipe (3), an upper cooling water manifold (4), a lower cooling water manifold (5), a pneumatic cooling water regulating valve (6), and cooling water nozzles (7), wherein the main cooling water supply pipe (1) is connected to the inlet ends of the upper cooling water manifold (4) and the lower cooling water manifold (5) respectively through the upper water supply pipe (2) and the lower water supply pipe (3), and the pneumatic cooling water regulating valve (6) is installed in the main cooling water supply pipe (1), characterized in that: It also has a compressed air delivery pipe (9), a manual ball valve (10), a solenoid switch valve (11), and an air check valve (12). The air inlet of the compressed air delivery pipe (9) is connected to the compressed air pipeline in the workshop, and the air outlet of the compressed air delivery pipe (9) is connected to the upper water supply pipe (2). The manual ball valve (10), the solenoid switch valve (11), and the air check valve (12) are installed sequentially in the pipe body from the air inlet to the air outlet of the compressed air delivery pipe (9).
2. The device for preventing scaling of cooling water nozzles in steel rolling equipment according to claim 1, characterized in that: The cooling water upper manifold (4) consists of a spray pipe (13) and a purge pipe (14). The spray pipe (13) and the purge pipe (14) are placed in parallel. The purge pipe (14) is located above the spray pipe (13). One end of the purge pipe (14) is connected to the upper water supply pipe (2) through a flange. The upper part of the purge pipe (14) is connected to the air outlet of the compressed air supply pipe (9). The lower part of the purge pipe (14) is connected to the upper end face of the spray pipe (13) through multiple connecting pipes (15). Multiple cooling water nozzles (7) are installed on the lower part of the spray pipe (13). The multiple cooling water nozzles (7) are evenly distributed along the length of the spray pipe (13).
3. The device for preventing scaling of cooling water nozzles in steel rolling equipment according to claim 2, characterized in that: The upper water supply pipe (2) and the purge pipe (14) of the cooling water upper manifold (4) are respectively equipped with a cooling water check valve (16) and an adjustable pressure holding valve (17). The cooling water check valve (16) is located near the water inlet end of the purge pipe (14).