A hot-rolled strip steel cooling circulating water treatment system

Abstract

The application provides a hot-rolled strip steel cooling circulating water treatment system and relates to the technical field of hot rolling of steel. The hot-rolled strip steel cooling circulating water treatment system comprises a water collecting pool, a purification cooling pool and a water storage pool. The water collecting pool is arranged below a laminar cooling device. The lower end of the water collecting pool is in communication with the lower end of the purification cooling pool. The upper end of the purification cooling pool is in communication with the upper end of the water storage pool. A filtering cooling module is arranged in the purification cooling pool and is used for filtering and cooling the cooling circulating water. The application can reduce the construction cost and energy consumption of the current hot-rolled strip steel cooling circulating water treatment system and improve the cooling and filtering effect of the cooling circulating water.

Description

Technical Field

[0001] This invention relates to the technical field of hot rolling of steel, and more specifically, to a cooling circulating water treatment system for hot-rolled strip steel. Background Technology

[0002] Laminar flow cooling technology for hot-rolled strip steel includes a laminar flow cooling device and a laminar flow cooling water treatment system. The laminar flow cooling device is used to cool the strip steel with low-pressure laminar flow columnar water, while the laminar flow cooling water circulation system is mainly used to treat the used cooling water and circulate the treated cooling water back to the cooling device.

[0003] Currently, referring to Figure 1 As shown, a conventional cooling circulating water treatment system includes equipment such as a hot water tank 11, a filter 12, a cooling tower 13, a cold water tank 14, and an iron sheet flushing ditch 15. The specific circulation process is as follows: iron oxide scale flows into the iron sheet flushing ditch with the cooling circulating water, and then enters the hot water tank 11. 50% of the cooling circulating water in the hot water tank 11 is directly pumped to the cold water tank 14 by a laminar flow lift pump group, and the other 50% of the cooling circulating water is pumped to the filter 12 and the cooling tower 13 by a side filter pump group. After filtration and cooling treatment, the water is mixed in the cold water tank 14. Finally, the cooling circulating water in the cold water tank 14 is pumped to the high-level water tank 10 by the lift pump group 9 or to the side spray pipe by the side spray pump group for use by the cooling device 8.

[0004] In the aforementioned circulation system, the cooling water needs to pass through filter 12 and cooling tower 13 sequentially under the action of the booster pump set to achieve separate filtration and cooling. Therefore, the resulting cooling process line has high equipment costs and energy consumption, and also occupies a large area. Furthermore, impurities are easily introduced again during the process of the cooling water flowing from filter 12 to cooling tower 13, thus affecting the final cooling and filtration effect. Summary of the Invention

[0005] The technical problem solved by this invention is to reduce the construction cost and energy consumption of current hot-rolled strip cooling circulating water treatment systems, while improving the cooling and filtration effect of the cooling circulating water. This invention provides a hot-rolled strip cooling circulating water treatment system.

[0006] A cooling circulating water treatment system for hot-rolled strip steel is characterized by comprising a water collection tank, a purification cooling tank, and a water storage tank. The water collection tank is located below a laminar flow cooling device. The lower end of the water collection tank is connected to the lower end of the purification cooling tank, and the upper end of the purification cooling tank is connected to the upper end of the water storage tank. A filtration cooling module is provided in the purification cooling tank for filtering and cooling the cooling circulating water.

[0007] Optionally, the filtration and cooling module includes multiple cooling pipes arranged closely together, with the end faces of the multiple cooling pipes forming a honeycomb pattern. Each cooling pipe is hollow and arranged along the height direction of the purification and cooling pool, and a cooling medium flows through the sidewall of each cooling pipe.

[0008] Optionally, the filtration cooling module further includes a filter brush head, which is axially disposed inside the cooling pipe.

[0009] Optionally, the filtration and cooling module includes multiple cooling pipes, each of which is formed by winding a spiral tube in a spiral trajectory. The cooling pipes are arranged along the height direction of the purification and cooling pool. Cooling medium flows through each of the spiral tubes, and there is a filtration gap between each pair of adjacent spiral tubes.

[0010] Optionally, the inner diameter of each of the cooling pipes varies along the axial direction.

[0011] Optionally, the filtration and cooling module includes multiple layers of cooling pipe groups spaced apart along the height direction of the purification and cooling pool, and each cooling pipe group includes multiple cooling pipes arranged along the length direction of the purification and cooling pool.

[0012] The cooling pipes in at least one layer of the cooling pipe group are U-shaped with the opening facing upwards or downwards. In the cooling pipe group of the same layer, the cooling pipes with the opening facing upwards are located on the lower side, and the cooling pipes with the opening facing downwards are located on the upper side. The cooling pipes with the opening facing downwards and the cooling pipes with the opening facing upwards are arranged alternately. Each cooling pipe includes an arc segment and two vertical segments. The two vertical segments of each cooling pipe are located inside two adjacent cooling pipes.

[0013] Optionally, each of the cooling tubes is composed of a plurality of closely arranged cooling capillary tubes, with a filter gap between each pair of adjacent cooling capillary tubes, and a cooling medium flowing through each cooling capillary tube.

[0014] Optionally, the water collection tank, the purification cooling tank, and the water storage tank are arranged in parallel and extend along the length of the laminar flow cooling device.

[0015] Optionally, a sludge hopper is provided below the purification cooling tank.

[0016] Optionally, the bottom of the water collection tank and the purification cooling tank has a slope that slopes downward toward the sludge hopper.

[0017] Optionally, the hot-rolled strip cooling circulating water treatment system further includes a backwashing device for rinsing the filter cooling module.

[0018] The advantages of this invention compared to the prior art are: In this invention, the cooling circulating water after use by the cooling device flows directly into the collection tank under gravity. As the water level in the collection tank gradually rises, the cooling circulating water flows upward into the purification cooling tank, where it undergoes both filtration and cooling from bottom to top. The purified cooling circulating water then overflows into the storage tank for storage. Finally, the cooling circulating water in the storage tank is resupplyed to the cooling device, thus achieving constant water level self-circulation cooling. In this invention, the cooling circulating water flows continuously between the collection tank, purification cooling tank, and storage tank through gravity, the principle of communicating vessels, and overflow. This eliminates the need for slag flushing ditches, inlet and outlet pipe corridors, laminar flow stations, and additional booster pumps and delivery pipelines, significantly reducing energy consumption and construction costs associated with installing additional pumps and laying pipelines. Furthermore, as the water level increases, the cooling circulating water automatically initiates filtration and heat exchange processes based on the principle of communicating vessels, requiring no manual control and further reducing labor costs. In actual deployment, the circulation system in this invention makes reasonable use of the area below the production line floor (cooling device) without occupying additional area, which greatly reduces construction costs.

[0019] Furthermore, this invention simultaneously cools and filters the cooling circulating water through a filtration cooling module within the purification cooling pool, further reducing the overall equipment cost and the overall area occupied by the system. It also avoids the possibility of impurities being introduced into the cooling circulating water between the filter and the cooling tower, thereby improving the cooling and filtration effect of the cooling circulating water. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a cooling circulating water treatment system in the prior art; Figure 2 This is a schematic diagram of the overall structure of the cooling circulating water treatment system in an exemplary embodiment of the present invention; Figure 3 This is a schematic diagram of the cooling circulating water treatment system in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the cooling pipe structure in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the cooling circulating water treatment system in Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the cooling pipe structure in Embodiment 2 of the present invention.

[0021] Figure 7 This is a schematic diagram of the cooling circulating water treatment system in Embodiment 3 of the present invention; Figure 8 This is a schematic diagram of the cooling pipe structure in Embodiment 3 of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. Water collection tank; 2. Purification and cooling tank; 3. Water storage tank; 4. Filtration and cooling module; 4a. Cooling pipe; 4b. Filter brush head; 4c. Spiral wound tube; 4d. Filter gap; 4e. Cooling fine tube; 4f. Vertical section; 4g. Arc section; 4h. Flow channel; 5. Cooling medium; 6. Sludge hopper; 7. Slope; 8. Cooling device; 9. Lifting pump set; 10. High-level water tank; 11. Hot water tank; 12. Filter; 13. Cooling tower; 14. Cold water tank; 15. Slag flushing ditch. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0024] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0025] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0026] Improving the performance of rolled products through post-rolling controlled cooling technology is an effective approach and an important part of hot-rolled strip steel production lines. Generally speaking, the cooling devices in hot-rolled strip steel cooling technology include laminar flow cooling devices, ultra-fast cooling devices, water curtain cooling devices, and high-pressure water spray cooling devices. Since the cooling water absorbs heat from the strip steel during the cooling process, the hot-rolled strip steel cooling circulating water treatment system in this invention can be used to treat the cooling circulating water that has heated up after the above-mentioned cooling devices have been used. Taking the laminar flow cooling device as an example, according to the requirements of the laminar flow cooling process of the 1000~2300 mm hot-rolled wide strip steel production line, the laminar flow cooling water mainly has the following characteristics: (1) large flow rate, generally between 4000 and 18000 m³. 3 / h; (2) Low pressure, the pressure at the laminar flow manifold is generally required to be 0.07 MPa, and the pressure is required to be stable; (3) Low water quality requirements, the iron oxide scale contained in the laminar flow cooling water has fine particle size and low oil content; (4) Large water volume variation, the water volume varies with the type of rolled steel plate. For ease of understanding, the embodiments of the present invention specifically introduce the application scenario of the hot rolled strip cooling circulating water treatment system in the laminar flow cooling device 8. It should be understood that the scope of protection of the present invention is not limited to this specific application scenario.

[0027] This invention provides a cooling circulating water treatment system for hot-rolled strip steel, referring to... Figure 2 , Figure 3 As shown, the system includes a water collection tank 1, a purification cooling tank 2, and a water storage tank 3. The water collection tank 1 is located below the laminar flow cooling device 8, and its lower end is connected to the lower end of the purification cooling tank 2. The upper end of the purification cooling tank 2 is connected to the upper end of the water storage tank 3. The purification cooling tank 2 is equipped with a filter cooling module 4, which is used to filter and cool the cooling circulating water.

[0028] Specifically, for laminar flow cooling technology, the cooling device mainly consists of an upper manifold and a lower manifold, located on the upper and lower surfaces of the strip steel, respectively. Cooling of the strip steel is achieved by spraying a laminar flow cooling medium (such as water). In actual installation, the water collection tank 1 is located below the outlet pipe assembly of the laminar flow cooling device 8 and the finished product conveyor rollers, specifically corresponding to the outlet of the laminar flow cooling device 8. The cooling circulating water after use by the laminar flow cooling device 8 flows into the water collection tank 1 under gravity, and then flows from the lower end of the water collection tank 1 through the filtration and cooling module 4 of the purification cooling tank 2, simultaneously completing filtration and cooling. The filtered and cooled circulating water then overflows from the upper end of the purification cooling tank 2 into the storage tank 3 for temporary storage, thus achieving constant water level self-circulation cooling.

[0029] In this embodiment of the invention, the cooling circulating water after use by the cooling device flows directly into the collection tank 1 under gravity. As the water level in the collection tank 1 gradually rises, the cooling circulating water flows from bottom to top into the purification cooling tank 2, where it undergoes both filtration and cooling from bottom to top. The purified cooling circulating water then overflows into the storage tank 3 for storage. Finally, the cooling circulating water in the storage tank 3 is resupplyed to the cooling device, thus achieving constant water level self-circulating cooling. In this invention, the cooling circulating water flows continuously between the collection tank 1, the purification cooling tank 2, and the storage tank 3 through gravity, the principle of communicating vessels, and overflow. This eliminates the need for slag flushing ditches, inlet and outlet pipe corridors, laminar flow stations, and additional booster pumps and pipelines, significantly reducing energy consumption and construction costs associated with installing additional pumps and laying pipelines. Furthermore, as the water level increases, the cooling circulating water automatically begins filtration and heat exchange processes based on the principle of communicating vessels, requiring no manual control and further reducing labor costs. In actual deployment, the circulation system in this invention makes reasonable use of the area below the production line floor (cooling device) without occupying additional area, which greatly reduces construction costs.

[0030] Furthermore, the present invention uses the filtration and cooling module 4 in the purification cooling pool 2 to simultaneously cool and filter the cooling circulating water, which further reduces the overall equipment cost and the overall area occupied by the system, and also avoids the possibility of impurities being introduced into the cooling circulating water between the filter 12 and the cooling tower 13, thereby improving the cooling and filtration effect of the cooling circulating water.

[0031] Further, as an option, refer to Figure 2 As shown, the water collection tank 1, the purification cooling tank 2 and the water storage tank 3 are arranged in parallel and extend along the length of the laminar flow cooling device 8.

[0032] Specifically, the water collection tank 1, the purification and cooling tank 2, and the water storage tank 3 are arranged parallel to each other along the rolling centerline to the mill drive side. The length of each of the three tanks extends from the rear section of the finishing mill F7 roll to the front section of the coiler DC1. This invention, by adopting the above arrangement, rationally utilizes the underground space of the production line, saving on the project's land area.

[0033] Furthermore, in some optional embodiments, the hot-rolled strip cooling circulating water treatment system also includes a booster pump set 9, which is used to lift the cooling water in the storage tank 3 to supply water to the laminar flow cooling device 8. Specifically, the cooling water in the storage tank 3 is first transported to the elevated water tank 10 by the booster pump set 9. The elevated water tank 10 is usually located above the laminar flow cooling device 8, and provides a stable water pressure to the system through gravity, ensuring that the cooling water can be smoothly supplied to the laminar flow cooling device 8, thereby providing the laminar flow cooling device 8 with cooled water. Therefore, the present invention only needs to set up one set of booster pump set 9 to lift the cooling circulating water from the storage tank 3 to the elevated water tank 10, which can achieve 100% filtration and cooling of the cooling circulating water without the need for additional pump sets.

[0034] In some alternative embodiments, refer to Figure 2 As shown, a sludge hopper 6 is located below the purification cooling tank 2. The sludge hopper 6 is used to collect settled impurities in the cooling circulating water. Further reference... Figure 2 As shown, the bottom of the purification cooling tank 2 has a slope 7, which slopes downwards towards the sludge hopper 6. The slope 7 allows impurities filtered by the filtration cooling module 4 to settle into the sludge hopper 6 along the bottom slope, and be discharged along with the iron oxide scale particles. Specifically, the sludge hopper 6 further collects the initially settled iron oxide scale, a small amount of floating oil, and other impurities, as well as impurities dropped during backwashing of the purification cooling tank 2, and periodically discharges the sludge via a sewage pump. Furthermore, a slope 7 is provided between the sludge hopper 6 and the inner wall of the collection tank 1, so that the cooling circulating water can fully release energy and initially settle some impurity particles in the water.

[0035] In some optional embodiments, the hot-rolled strip cooling circulating water treatment system further includes a backwashing device (not shown in the figure). The backwashing device can be installed above the filter cooling module 4 or on the side wall of the purification cooling tank 2, for rinsing the filter cooling module 4. Specifically, the backwashing device can be a flushing water pipe arranged horizontally above the filter cooling module 4, with multiple high-pressure nozzles spaced apart on the flushing water pipe. The high-pressure nozzles spray high-pressure water onto the filter cooling module 4 to achieve flushing. The washed-off impurities then enter the sludge hopper 6 along the slope 7.

[0036] In some alternative embodiments, at 12000 m 3Taking a cooling circulating water volume of / h as an example, the design calculation of the layout height of each area is as follows: In the actual layout process, it is necessary to avoid the various detection instruments on the production line. Assuming the ground elevation is 0.00 m, in this embodiment, the top elevation of the water collection tank 1, the purification cooling tank 2, and the water storage tank 3 is approximately -1.00 m, the bottom elevation is approximately -9.00 to -10.00 m, and the lowest water level of the high-level water tank 10 is approximately +7.00 m. The length of the water collection tank 1, the purification cooling tank 2, and the water storage tank 3 is approximately 100 m, and the cross-sectional width ratio of the water collection tank 1, the purification cooling tank 2, and the water storage tank 3 along the rolling mill drive side is 1:4:1. In other embodiments, the dimensions of each functional area can also be reasonably adjusted according to the cooling circulating water volume.

[0037] In some alternative embodiments, refer to Figures 3 to 8 As shown, the filter cooling module 4 includes multiple cooling pipes, each of which is hollow and arranged along the height of the purification cooling pool 2. Cooling medium 5 flows through the interlayer or wall of each cooling pipe. The filter cooling module 4 is described below through a specific embodiment: Example 1 In this embodiment, refer to Figure 3 and Figure 4 As shown, multiple cooling pipes 4a are closely arranged within the filter cooling module 4, and each cooling pipe 4a has a hexagonal cross-section, resulting in a honeycomb-like end face of the closely arranged cooling pipes 4a. Of course, the cross-section of the cooling pipes 4a can be adjusted to other shapes without affecting the filtration and cooling effect. It should be understood that the cooling medium 5 in this embodiment flows within the interlayer of the honeycomb structure, that is, within the sidewall of the cooling pipes 4a. The cooling medium can be water or liquid nitrogen. When the cooling circulating water flows from bottom to top, the cooling medium 5 within the sidewall of the cooling pipes can absorb heat from the cooling circulating water to further cool it. Simultaneously, the cooling medium collects and stores this absorbed heat for reuse. In other embodiments, this collected and stored heat can serve as a power heat source for the lithium bromide refrigeration unit.

[0038] To achieve filtration of the cooling circulating water, refer to Figure 4 As shown, the filtration and cooling module 4 in this embodiment also includes a filter brush head 4b, which is axially disposed within the cooling pipe 4a, i.e., within the hollow channel of the honeycomb structure. Specifically, the filter brush head 4b can be detachable or integrated. The filter brush head 4b can be a pine branch-shaped brush head made of PVC material. Specifically, when water flows within the hollow channel of the honeycomb structure, the filter brush head 4b can be automatically rotated by the water flow velocity, adsorbing iron oxide particles and a small amount of oil in the cooling circulating water, thereby purifying the cooling circulating water.

[0039] Furthermore, optionally, when the filter brush head 4b can be a single unit, the filter cooling module 4 may also include a rotary drive (not shown in the figure), specifically a motor. The rotary drive is connected to the filter brush head 4b and is used to drive the filter brush head 4b to rotate. Thus, during backwashing, the impurities adsorbed on the filter brush head 4b can be thoroughly removed under the combined action of the flushing force of the high-pressure water and the centrifugal force generated by the rotation of the filter brush head 4b itself.

[0040] Example 2 In this embodiment, refer to Figures 5 to 6 As shown, the filtration and cooling module 4 also includes multiple closely arranged cooling pipes 4a. Each cooling pipe 4a is formed by spirally winding a coiled tube 4c, forming a Johnson mesh structure. Each cooling pipe 4a is arranged along the height direction of the purification cooling pool 2. The spiral arrangement effectively solves the problem of dead corners, enhances fluid flow, and reduces blockage. In addition, a cooling medium 5 flows inside the coiled tube 4c, which can be water or other media. When the cooling circulating water flows from bottom to top, the cooling water can exchange heat with the cooling medium 5 inside the coiled tube 4c, and then collect, store, and utilize this heat. While cooling the cooling circulating water, secondary energy utilization can be achieved.

[0041] Specifically, refer to Figure 6 As shown, there is a filter gap 4d between each pair of adjacent winding tubes 4c, meaning there is a certain gap between each pair of adjacent winding tubes 4c. Solid particulate impurities in the cooling circulating water are trapped in the filter gap 4d. During actual winding, the distribution of the filter gap 4d between each pair of adjacent winding tubes can be controlled to ensure uniformity of filtration accuracy. In this embodiment, by introducing cooling medium 5 into each winding tube, iron oxide scale particles and a small amount of oil in the cooling circulating water can be filtered and adsorbed while further cooling the circulating water is achieved.

[0042] Furthermore, referring to Figure 6 As shown, the inner diameter of each cooling pipe 4a varies along the axial direction. Specifically, in this embodiment, the inner diameter of each cooling pipe 4a increases-decreases-increases-decreases sequentially from bottom to top. In practical applications, this variation can be cyclically adjusted according to the actual height of the purification cooling pool 2. This characteristic of varying the inner diameter of the cooling pipe 4a is beneficial for increasing the filtration area of ​​the cooling circulating water, thereby improving the filtration effect.

[0043] In this embodiment, the cooling pipe 4a is beneficial to inducing local turbulence or eddy current of the cooling circulating water inside or between the cooling pipes 4a through the change of inner diameter shrinkage - expansion, enhancing fluid mixing. The flow velocity increases through the inner diameter shrinkage section, generating a higher shear force to effectively scour the cooling pipe 4a and reducing the risk of particle deposition and blockage. At the same time, the flow velocity decreases in the expansion section, which helps to balance the overall pressure drop and avoid excessive energy loss. The change in flow velocity causes the separation of particles due to inertial differences. Larger particles are more likely to deposit in the expansion section due to the sudden drop in velocity, facilitating directional collection or discharge, while smaller particles are more likely to be intercepted in the shrinkage section. This classification mechanism optimizes the filtration efficiency and reduces the blockage pressure in a single area.

[0044] Embodiment 3 In this embodiment, referring to Figures 7 to 8 as shown, the filtration and cooling module 4 includes multiple layers of cooling pipe groups distributed at intervals along the height direction of the purification and cooling pool 2. Each layer of cooling pipe group includes multiple cooling pipes 4a arranged along the length direction of the purification and cooling pool 2.

[0045] Among them, in the cooling pipe group of the bottom - most layer in the purification and cooling pool 2, each cooling pipe 4a is in an arc shape with the opening facing downwards, and the multiple cooling pipes 4a of the bottom - most layer are arranged at intervals along the length direction of the purification and cooling pool 2.

[0046] In the other cooling pipe groups in the purification and cooling pool 2 except the bottom - most layer, the cooling pipes 4a are in a U - shape with the opening facing upwards or downwards. In the same - layer cooling pipe group, the cooling pipes 4a with the opening facing upwards are located on the lower side, and the cooling pipes 4a with the opening facing downwards are located on the upper side, and the cooling pipes 4a with the opening facing downwards and the cooling pipes 4a with the opening facing upwards are arranged alternately. Specifically, each cooling pipe 4a includes two vertical segments 4f and an arc segment 4g. The two vertical segments 4f are respectively located inside adjacent two cooling pipes 4a, and a flow channel 4h is formed between the vertical segments of every two adjacent cooling pipes 4a. This way of arranging the circuitous pipeline applies the principle of the Tesla unidirectional conduction valve, reducing the unidirectional passing rate of the fluid from bottom to top, thereby prolonging the filtration and cooling path of the cooling circulating water in the purification and cooling pool, and then improving the filtration and cooling effect. At the same time, the arc segment 4g of the U - shaped cooling pipe with the opening facing upwards located on the lower side can be used to collect the impurity particles naturally precipitated due to the kinetic energy consumption in the circulating water. Of course, on the premise of not affecting the filtration and cooling effect, the shape of the cooling pipe 4a can also be adjusted to other ways, such as an arc shape, a "mouth" shape with one side open, etc.

[0047] Furthermore, referring to Figure 8As shown, each cooling pipe 4a is composed of several closely arranged cooling capillary tubes 4e. Each cooling capillary tube 4e extends along the width direction of the purification cooling pool 2, and both ends of each cooling capillary tube 4e are fixed to the two side walls of the purification cooling pool 2 along the width direction. A filter gap 4d is provided between every two adjacent cooling capillary tubes 4e to trap fine impurities in the water. Furthermore, a cooling medium 5 flows within each cooling capillary tube 4e; the cooling medium 5 can be water or other media, to further cool the circulating water.

[0048] Furthermore, in this embodiment, a backwashing device (not shown in the figure) is installed on the side wall of the purification cooling pool 2 along the width direction. The flushing water pipe of the backwashing device is connected to the port of each cooling pipe 4a. Multiple high-pressure nozzles can be installed at the pipe opening of the flushing water pipe. The high-pressure nozzles flush the cooling pipe 4a by spraying high-pressure water in the horizontal direction. The impurities accumulated in the arc-shaped section 4g can be flushed by high-pressure water to the port near the other side wall of the purification cooling pool 2 for collection and treatment.

[0049] In this embodiment, the cooling tube 4e can preferably be a 50mm diameter cooling tube, ensuring strength while providing a large filtration and cooling contact area. This embodiment's purification and cooling structure is easy to implement and highly practical for engineering applications.

[0050] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A cooling circulating water treatment system for hot-rolled strip steel, characterized in that, The system includes a water collection tank (1), a purification cooling tank (2), and a water storage tank (3). The water collection tank (1) is located below the laminar flow cooling device (8). The lower end of the water collection tank (1) is connected to the lower end of the purification cooling tank (2), and the upper end of the purification cooling tank (2) is connected to the upper end of the water storage tank (3). The purification cooling tank (2) is equipped with a filtration cooling module (4), which is used to filter and cool the cooling circulating water. The filtration cooling module (4) includes multiple cooling... The cooling pipe (4a) is hollow and is arranged along the height direction of the purification cooling pool (2). Cooling medium (5) flows through the side wall of each cooling pipe (4a). Multiple cooling pipes (4a) are arranged closely together, and the end faces of multiple cooling pipes (4a) are honeycomb-shaped. The filter cooling module (4) also includes a filter brush head (4b), which is arranged axially inside the cooling pipe (4a). A sludge hopper (6) is provided below the purification cooling pool (2).

2. The hot-rolled strip cooling circulating water treatment system according to claim 1, characterized in that, The filtration and cooling module (4) includes multiple cooling pipes (4a), each of which is formed by winding a spiral tube (4c) in a spiral trajectory. The cooling pipes (4a) are arranged along the height direction of the purification and cooling pool (2). Cooling medium (5) flows through each of the spiral tubes (4c), and there is a filter gap (4d) between each two adjacent spiral tubes (4c).

3. The hot-rolled strip cooling circulating water treatment system according to claim 2, characterized in that, The inner diameter of each of the cooling pipes (4a) varies along the axial direction.

4. The hot-rolled strip cooling circulating water treatment system according to claim 1, characterized in that, The filtration and cooling module (4) includes multiple layers of cooling pipe groups spaced apart along the height direction of the purification and cooling pool (2), and each layer of the cooling pipe group includes multiple cooling pipes (4a) arranged along the length direction of the purification and cooling pool (2). Each of the cooling tubes (4a) is composed of a number of cooling capillary tubes (4e) arranged closely together. Each cooling capillary tube (4e) extends along the width direction of the purification cooling pool (2). There is a filter gap (4d) between each two adjacent cooling capillary tubes (4e). Cooling medium (5) flows in each cooling capillary tube (4e).

5. The hot-rolled strip cooling circulating water treatment system according to claim 4, characterized in that, The cooling pipes (4a) in at least one layer of the cooling pipe group are U-shaped with the opening facing upward or downward. In the cooling pipe group of the same layer, the cooling pipes (4a) with the opening facing upward are located on the lower side, and the cooling pipes (4a) with the opening facing downward are located on the upper side. The cooling pipes (4a) with the opening facing downward and the cooling pipes (4a) with the opening facing upward are arranged alternately. Each cooling pipe (4a) includes two vertical sections (4f) and one arc-shaped section (4g). The two vertical sections (4f) of each cooling pipe (4a) are located inside two adjacent cooling pipes (4a).

6. The hot-rolled strip cooling circulating water treatment system according to any one of claims 1-5, characterized in that, It also includes a backwashing device for rinsing the filter cooling module (4).

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