Hot-rolled strip steel cooling circulating water treatment system

Abstract

The invention provides a hot-rolled strip steel cooling circulating water treatment system, and relates to the technical field of steel hot rolling, the hot-rolled strip steel cooling circulating water treatment system comprises a water collecting tank, a purifying and cooling tank and a water storage tank, the water collecting tank is arranged below a laminar cooling device, the lower end of the water collecting tank is communicated with the lower end of the purifying and cooling tank, and the water storage tank is arranged below the purifying and cooling tank. The upper end of the purifying and cooling pond is communicated with the upper end of the water storage pond, and a filtering and cooling module is arranged in the purifying and cooling pond and used for filtering and cooling circulating cooling water. The construction cost and energy consumption of an existing hot-rolled strip steel cooling circulating water treatment system can be reduced, and meanwhile the cooling and filtering effect of cooling circulating water is improved.

Description

Technical Field

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

[0002] The laminar cooling technology for hot-rolled strip steel includes a laminar cooling device and a laminar cooling water treatment system. The laminar cooling device is used to cool the strip steel with low-pressure laminar columnar water, and the laminar cooling water circulation system is mainly used to treat the used cooling water and circulate the treated cooling water 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 scale slag flushing ditch 15. The specific circulation process is that iron scale enters the iron scale slag flushing ditch along with the cooling circulating water flow and then enters the hot water tank 11. 50% of the cooling circulating water in the hot water tank 11 is directly lifted to the cold water tank 14 by the laminar lift pump set, and the other 50% of the cooling circulating water is lifted to the filter 12 and the cooling tower 13 by the side filtration pump set. After being filtered and cooled, it is mixed in the cold water tank 14. The cooling circulating water in the cold water tank 14 is finally lifted to the high-level water tank 10 by the lift pump set 9 or lifted to the side spray pipeline by the side spray pump set for use by the cooling device 8.

[0004] In the above circulation system, the cooling circulating water needs to pass through the filter 12 and the cooling tower 13 in sequence under the action of the lift pump set to achieve filtration and cooling respectively. Therefore, the equipment cost of the formed cooling process line and the energy consumption generated are relatively high, and it is also easy to occupy a large area. Moreover, impurities are easily introduced again during the process of the cooling circulating water flowing from the filter 12 to the cooling tower 13, thus affecting the final cooling and filtration effect. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to reduce the construction cost and energy consumption of the current cooling circulating water treatment system for hot-rolled strip steel, and at the same time improve the cooling and filtration effect of the cooling circulating water. The present invention provides a cooling circulating water treatment system for hot-rolled strip steel.

[0006] A cooling circulating water treatment system for hot-rolled strip steel, characterized in that it includes a collecting pool, a purification cooling pool, and a storage pool. The collecting pool is arranged below the laminar cooling device, the lower end of the collecting pool is communicated with the lower end of the purification cooling pool, the upper end of the purification cooling pool is communicated with the upper end of the storage pool, and a filtering and cooling module is arranged in the purification cooling pool. The filtering and cooling module is used to filter and cool the cooling circulating water.

[0007] Optionally, the filtering and cooling module includes a plurality of cooling tubes, which are arranged closely and in a honeycomb pattern at the end faces of the plurality of cooling tubes. Each cooling tube is hollow and arranged along the height direction of the purification and cooling pool, and a cooling medium flows through the side wall of each cooling tube.

[0008] Optionally, the filtering and cooling module further includes a filtering brush head, which is axially arranged inside the cooling tube.

[0009] Optionally, the filtering and cooling module includes a plurality of cooling tubes, each of which is formed by winding a winding tube in a spiral track. The cooling tube is arranged along the height direction of the purification and cooling pool, and a cooling medium flows through each winding tube. There is a filtering gap between every two adjacent winding tubes.

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

[0011] Optionally, the filtering and cooling module includes multiple layers of cooling tube groups spaced along the height direction of the purification and cooling pool, and each cooling tube group includes a plurality of cooling tubes arranged along the length direction of the purification and cooling pool.

[0012] In at least one layer of the cooling tube groups, the cooling tubes are in a U shape with the opening facing upward or downward. In the same layer of the cooling tube groups, the cooling tubes with the opening facing upward are located on the lower side, and the cooling tubes with the opening facing downward are located on the upper side. The cooling tubes with the opening facing downward and the cooling tubes with the opening facing upward are arranged alternately. Each cooling tube includes an arc section and two vertical sections, and the two vertical sections of each cooling tube are respectively located inside two adjacent cooling tubes.

[0013] Optionally, each cooling tube is formed by closely arranging a number of cooling fine tubes, there is a filtering gap between every two adjacent cooling fine tubes, and a cooling medium flows through each cooling fine tube.

[0014] Optionally, the collecting pool, the purification and cooling pool, and the storage pool are arranged in parallel in sequence and extend along the length direction of the laminar flow cooling device.

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

[0016] Optionally, the bottoms of the collecting pool and the purification and cooling pool have slopes, and the slopes incline downward towards the direction of the sludge hopper.

[0017] Optionally, the hot-rolled strip steel cooling circulating water treatment system further includes a backwashing device, which is used to wash the filtering and cooling module.

[0018] The beneficial effects of the present invention compared with the prior art are:

[0019] In the present invention, the cooling circulating water after being used by the cooling device directly flows into the collecting pool under the action of gravity. As the water level of the cooling circulating water in the collecting pool gradually rises, the cooling circulating water flows into the purification cooling pool from bottom to top, and filtration and cooling are carried out simultaneously from bottom to top in the purification cooling pool. The purified and cooled cooling circulating water finally enters the storage pool for storage under the action of overflow, and finally the cooling circulating water in the storage pool is re-supplied to the cooling device, thus realizing constant water level self-circulation cooling. In the present invention, the cooling circulating water continuously flows between the collecting pool, the purification cooling pool and the storage pool under the action of gravity, the principle of communicating vessels and the action of overflow, without the need to set up slag flushing ditches, inlet and outlet pipe galleries, laminar flow water stations and additional lift pump groups and conveying pipelines, thereby greatly reducing the energy consumption and construction investment generated by setting up additional pump groups and laying pipelines. Moreover, when the water level of the cooling circulating water increases, the filtration and heat exchange processes can automatically start based on the principle of the communicating vessel, without manual control, which also reduces the labor cost. During actual layout, the circulating system in the present invention makes reasonable use of the area below the production line floor (cooling device) without occupying additional area, greatly reducing the construction cost.

[0020] In addition, the present invention simultaneously cools and filters the cooling circulating water through the filtration and cooling module in the purification cooling pool, further reducing the overall equipment cost and the overall area occupied by the system, and also avoiding the possibility of introducing impurities between the filter and the cooling tower, thereby improving the cooling and filtration effect of the cooling circulating water. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a cooling circulating water treatment system in the prior art;

[0022] Figure 2 is an overall structural schematic diagram of a cooling circulating water treatment system in an exemplary embodiment of the present invention;

[0023] Figure 3 is a structural schematic diagram of a cooling circulating water treatment system in Embodiment 1 of the present invention;

[0024] Figure 4 is a structural schematic diagram of a cooling pipe in Embodiment 1 of the present invention;

[0025] Figure 5 is a structural schematic diagram of a cooling circulating water treatment system in Embodiment 2 of the present invention;

[0026] Figure 6 is a structural schematic diagram of a cooling pipe in Embodiment 2 of the present invention.

[0027] Figure 7 is a structural schematic diagram of a cooling circulating water treatment system in Embodiment 3 of the present invention;

[0028] Figure 8 This is a schematic structural view of the cooling pipe in Embodiment 3 of the present invention.

[0029] Explanation of the reference numerals in the drawings:

[0030] 1, sump; 2, purification and cooling pond; 3, water storage tank; 4, filtration and cooling module; 4a, cooling pipe; 4b, filtration brush head; 4c, winding pipe; 4d, filtration gap; 4e, cooling capillary; 4f, vertical section; 4g, arc section; 4h, flow channel; 5, cooling medium; 6, sludge hopper; 7, slope; 8, cooling device; 9, lift pump set; 10, elevated water tank; 11, hot water tank; 12, filter; 13, cooling tower; 14, cold water tank; 15, iron sheet slag flushing ditch. Detailed implementation manners

[0031] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail 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 described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0032] As used herein, the term "including" and its variations are open-ended, that is, "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"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish different devices, modules, or units, and are not used to limit the order of the functions performed by these devices, modules, or units or their interdependent relationships.

[0033] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise clearly specified in the context, it should be understood as "one or more".

[0034] It has become an effective way to improve the properties of rolled pieces through post-rolling controlled cooling technology, which is an important link in the hot-rolled strip production line. Generally speaking, the cooling devices in the hot-rolled strip cooling technology include laminar flow cooling device 8, ultra-rapid cooling device, water curtain cooling device, high-pressure water spray cooling device, etc. Since the cooling water absorbs the heat of the strip during the cooling process, the hot-rolled strip cooling circulating water treatment system in the present invention can be used to treat the cooling circulating water that has been heated after being used by the above cooling devices. Taking the laminar flow cooling device as an example, according to the requirements of the laminar flow cooling process of the 1000-2300mm hot-rolled wide strip production line, the laminar flow cooling water mainly has the following characteristics: (1) large flow rate, generally between 4000 and 18000m 3 / h; (2) low pressure, the pressure required at the laminar flow header is generally 0.07MPa, and stable pressure is required; (3) low requirements for water quality indicators, the scale particles in the laminar flow cooling water are fine and the oil content is small; (4) large variation in water volume, the water consumption varies with the variety of rolled steel plates. For the convenience 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 protection scope of the present invention is not limited to this specific application scenario.

[0035] The embodiments of the present invention provide a hot-rolled strip cooling circulating water treatment system. Referring to Figure 2 、 Figure 3 shown, the system includes a collecting pool 1, a purification cooling pool 2 and a storage pool 3. The collecting pool 1 is arranged below the laminar flow cooling device 8. The lower end of the collecting pool 1 is interconnected with the lower end of the purification cooling pool 2, and the upper end of the purification cooling pool 2 is interconnected with the upper end of the storage pool 3. A filtering and cooling module 4 is provided in the purification cooling pool 2, and the filtering and cooling module 4 is used to filter and cool the cooling circulating water.

[0036] Specifically, for the laminar flow cooling technology, the cooling device 6 is mainly composed of an upper header and a lower header. The upper header and the lower header are respectively located on the upper and lower surfaces of the strip, and the strip is cooled by spraying a laminar flow cooling medium (such as water). In actual layout, the collecting pool 1 is located below the outlet pipe group of the laminar flow cooling device 8 and the finished product conveying roller table, and is specifically corresponding to the water outlet of the laminar flow cooling device 8. The cooling circulating water used by the laminar flow cooling device 8 flows into the collecting pool 1 under the action of gravity, and then flows through the filtering and cooling module 4 of the purification cooling pool 2 from the lower end of the collecting pool 1, while completing filtration and cooling. The filtered and cooled circulating water enters the storage pool 3 through the overflow at the upper end of the purification cooling pool 2 for temporary storage, thereby realizing constant water level self-circulation cooling.

[0037] In an embodiment of the present invention, the cooling circulating water after being used by the cooling device directly flows into the collecting pool 1 under the action of gravity. As the water level of the cooling circulating water in the collecting pool 1 gradually rises, the cooling circulating water flows into the purification cooling pool 2 from bottom to top, and filtration and cooling are carried out simultaneously from bottom to top in the purification cooling pool 2. The purified and cooled cooling circulating water finally enters the storage pool 3 under the action of overflow for storage, and finally the cooling circulating water in the storage pool 3 is re-supplied to the cooling device, thereby realizing constant water level self-circulation cooling. In the present invention, the cooling circulating water continuously flows between the collecting pool 1, the purification cooling pool 2 and the storage pool 3 through the action of gravity, the principle of communicating vessels and the action of overflow, without the need to set up slag flushing ditches, inlet and outlet pipe galleries, laminar flow water stations and additional lift pump groups and conveying pipelines, thereby greatly reducing the energy consumption and construction investment generated by setting up additional pump groups and laying pipelines. And when the water level of the cooling circulating water increases, the filtration and heat exchange processes can be automatically started based on the principle of communicating vessels, without manual control, which also reduces the labor cost. During actual layout, the circulating system in the present invention reasonably utilizes the area below the production line ground (cooling device) without occupying additional area, greatly reducing the construction cost.

[0038] In addition, the present invention cools and filters the cooling circulating water through the filter cooling module 4 in the purification cooling pool 2, further reducing the overall equipment cost and the overall area occupied by the system, and also avoiding the possibility of impurities being introduced between the filter 12 and the cooling tower 13 in the cooling circulating water, thereby improving the cooling and filtering effect of the cooling circulating water.

[0039] Further optionally, as shown in Figure 2 the collecting pool 1, the purification cooling pool 2 and the storage pool 3 are arranged in parallel in sequence and extend along the length direction of the laminar flow cooling device 8.

[0040] Specifically, the collecting pool 1, the purification cooling pool 2 and the storage pool 3 are arranged in parallel in sequence along the direction from the rolling center line to the drive side of the rolling mill, and the length directions of the collecting pool 1, the purification cooling pool 2 and the storage pool 3 respectively extend from the rear section of the finishing F7 roll to the front section of the coiler DC1. By adopting the above layout method, the present invention reasonably develops and utilizes the underground space of the production line and saves the project floor area.

[0041] Further, in some alternative embodiments, the hot-rolled strip cooling circulating water treatment system further includes a lifting 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 lifting pump set 9. The elevated water tank 10 is usually located above the laminar flow cooling device 8 and provides a stable water pressure for the system through gravity, ensuring that the cooling water can be smoothly supplied into the laminar flow cooling device 8, thereby providing cooled cooling water for the laminar flow cooling device 8. Therefore, the present invention only needs to set a set of lifting pump sets 9 to lift the cooling circulating water from the storage tank 3 to the elevated water tank 10, and can achieve 100% filtration and cooling of the cooling circulating water without additionally setting other pump sets.

[0042] In some alternative embodiments, referring to Figure 2 As shown, a sludge hopper 6 is provided below the purification cooling pool 2, and the sludge hopper 6 is used to collect the sedimented impurities in the cooling circulating water. Further referring to Figure 2 As shown, the bottom of the purification cooling pool 2 has a slope 7, and the slope 7 slopes downward in the direction of the sludge hopper 6. The setting of the slope 7 can make the impurities filtered by the filtration cooling module 4 sink into the sludge hopper 6 along the bottom slope of the pool and be discharged together with the scale particles. Specifically, the sludge hopper 6 further collects impurities such as initially sedimented scale, a small amount of floating oil, and impurities dropped during the backwashing of the purification cooling pool 2, and regularly discharges the slurry through a sewage pump. Further, a slope 7 is provided between the sludge hopper 6 and the inner side wall of the collecting pool 1 to enable the cooling circulating water to fully release energy here and initially settle some of the impurity particles in the water.

[0043] In some alternative 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 arranged above the filtration cooling module 4 or on the side wall of the purification cooling pool 2 for flushing the filtration cooling module 4. Specifically, the backwashing device can be a flushing water pipe horizontally arranged above the filtration cooling module 4, and a plurality of high-pressure nozzles are arranged at intervals on the flushing water pipe. The high-pressure nozzles flush the filtration cooling module 4 by spraying high-pressure water on the filtration cooling module 4. The flushed impurities then enter the sludge hopper 6 along the slope 7.

[0044] In some alternative embodiments, at 12000m 3Taking the amount of cooling circulating water of / h as an example, the layout heights of each area are designed and calculated: During the actual layout process, various detection instruments on the production line need to be avoided. Assuming the ground elevation is 0.00m, in this embodiment, the top elevation of the collecting pool 1, the purification cooling pool 2, and the storage pool 3 is about -1.00m, and the bottom elevation is about -9.00 to -10.00m. The elevation of the lowest water level of the elevated water tank 10 is about +7.00m. The collecting pool 1, the purification cooling pool 2, and the storage pool 3 are about 100m in the length direction, and the cross-sectional width ratios of the collecting pool 1, the purification cooling pool 2, and the storage pool 3 along the drive side direction of the rolling mill are 1:4:1 in sequence. In other embodiments, the sizes of each functional area can also be reasonably adjusted according to the amount of cooling circulating water.

[0045] In some alternative embodiments, referring to Figures 3 to 8 as shown, the filtration cooling module 4 includes a plurality of cooling tubes. Each cooling tube is hollow and is arranged along the height direction of the purification cooling pool 2. A cooling medium 5 flows through the interlayer or the tube wall of each cooling tube. The following introduces the filtration cooling module 4 through specific embodiments:

[0046] Embodiment 1

[0047] In this embodiment, referring to Figure 3 and Figure 4 as shown, the multiple cooling tubes 4a in the filtration cooling module 4 are closely arranged, and the cross-section of each cooling tube 4a is hexagonal, so that the end faces of the multiple closely arranged cooling tubes 4a are in a honeycomb shape. Of course, on the premise of not affecting the filtration and cooling effects, the cross-section of the cooling tube 4a can also be adjusted to other shapes. It should be understood that the cooling medium 5 in this embodiment flows in the interlayer of this honeycomb structure, that is, in the side wall of the cooling tube 4a. The cooling medium can be water or its liquid nitrogen. When the cooling circulating water flows from bottom to top, the cooling medium 5 in the side wall of the cooling tube can absorb the heat in the cooling circulating water to further cool the cooling circulating water. At the same time, the cooling medium collects and stores the absorbed part of the heat for utilization. In other embodiments, this part of the collected and stored heat can be used as the power heat source of the lithium bromide refrigeration unit.

[0048] In order to filter the cooling circulating water, referring to Figure 4 as shown, the filtration cooling module 4 in this embodiment further includes a filtration brush head 4b. The filtration brush head 4b is axially arranged in the cooling tube 4a, that is, in the hollow channel of the honeycomb structure. Specifically, the filtration brush head 4b can be a split type or an integral type. The filtration brush head 4b can be a pine branch-shaped brush head made of PVC material. Specifically, when the water flow flows in the hollow channel of the honeycomb structure, the filtration brush head 4b can be automatically rotated by the water flow velocity, adsorbing the scale particles and a small amount of oil in the cooling circulating water, so as to realize the purification of the cooling circulating water.

[0049] Furthermore, as an option, when the filter brush head 4b can be integrated, the filter cooling module 4 may further include a rotary drive (not shown in the figure), specifically a motor, which is connected to the filter brush head 4b and used to drive the filter brush head 4b to rotate self - sufficiently. Thus, when backwashing, the impurities adsorbed on the filter brush head 4b can be completely removed under the combined action of the flushing force of high - pressure water and the centrifugal force generated by the self - rotation of the filter brush head 4b.

[0050] Embodiment 2

[0051] In this embodiment, referring to Figures 5 to 6 as shown, the filter cooling module 4 also includes a plurality of closely arranged cooling pipes 4a. Each cooling pipe 4a is formed by winding a winding pipe 4c in a spiral trajectory, presenting a Johnson screen tube structure. Each cooling pipe 4a is arranged along the height direction of the purification cooling pool 2. The spiral arrangement structure can effectively solve the problem of treatment dead - ends, enhance fluid permeability, and reduce blockage. In addition, a cooling medium 5 flows through the winding pipe 4c, and the cooling medium 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 in the winding pipe 4c, and then collect and store this part of heat for utilization. While cooling the cooling circulating water, energy secondary utilization can be achieved.

[0052] Specifically, referring to Figure 6 as shown, there is a filter gap 4d between every two adjacent winding pipes 4c, that is, there is a certain pipe gap between every two adjacent winding pipes 4c. Solid particle impurities in the cooling circulating water are stuck in the filter gap 4d. During actual winding, the distribution of the filter gap 4d between every two adjacent winding pipes can be controlled to be uniform to control the filtration accuracy. In this embodiment, by introducing the cooling medium 5 into each winding pipe, while filtering and adsorbing iron oxide scale particles and a small amount of oil stains in the cooling circulating water, further cooling of the circulating water can be achieved.

[0053] Furthermore, referring to Figure 6 as shown, the inner diameter of each cooling pipe 4a changes along the axial direction. Specifically, in this embodiment, the inner diameter of each cooling pipe 4a shows a trend of increasing - decreasing - increasing - decreasing from bottom to top, and can be cyclically changed according to the actual height of the purification cooling pool 2 in actual application. The changing characteristics of the inner diameter of the cooling pipe 4a are beneficial to increasing the filtration area of the cooling circulating water, thereby improving the filtration effect.

[0054] In this embodiment, the cooling pipe 4a is beneficial to inducing local turbulence or eddy current in or between the cooling pipes 4a by means of the change of internal diameter shrinkage-expansion, enhancing fluid mixing. The flow velocity increases through the internal 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 finer particles are more likely to be intercepted in the shrinkage section. This grading mechanism optimizes the filtration efficiency and reduces the blockage pressure in a single area.

[0055] Embodiment 3

[0056] 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 in the height direction of the purification and cooling pool 2, and each layer of cooling pipe group includes multiple cooling pipes 4a arranged in the length direction of the purification and cooling pool 2.

[0057] Among them, in the cooling pipe group at the bottommost layer in the purification and cooling pool 2, each cooling pipe 4a is in an arc shape with the opening facing downward, and the multiple cooling pipes 4a at the bottommost layer are arranged at intervals in the length direction of the purification and cooling pool 2.

[0058] In the other cooling pipe groups in the purification and cooling pool 2 except the bottommost layer, the cooling pipes 4a are in a U shape with the opening facing upward or downward. In the same layer of cooling pipe group, 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, and the cooling pipes 4a with the opening facing downward and the cooling pipes 4a with the opening facing upward are arranged alternately. Specifically, each cooling pipe 4a includes two vertical sections 4f and an arc section 4g. The two vertical sections 4f are respectively located inside adjacent two cooling pipes 4a, and a flow channel 4h is formed between the vertical sections of every two adjacent cooling pipes 4a. This circuitous pipeline layout applies the principle of the Tesla one-way conduction valve, reducing the one-way 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 further improving the filtration and cooling effect. At the same time, the arc section 4g of the U-shaped cooling pipe with the opening facing upward 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 arc shape, "mouth" shape with one side open, etc.

[0059] Furthermore, referring to Figure 8As shown, each cooling pipe 4a is formed by tightly arranging a number of 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 in the width direction of the purification cooling pool 2. There is a filtering gap 4d between every two adjacent cooling capillary tubes 4e, so as to intercept fine impurities in the water. In addition, a cooling medium 5 flows through each cooling capillary tube 4e. The cooling medium 5 can be water or other media to further cool the circulating water.

[0060] Further, in this embodiment, a backwashing device (not shown in the figure) is arranged on the side wall of the purification cooling pool 2 along the width direction. The washing water pipe of the backwashing device is communicated with the port of each cooling pipe 4a. A plurality of high-pressure nozzles can be arranged at the nozzle of the washing water pipe. The high-pressure nozzles spray high-pressure water in the horizontal direction to wash the cooling pipe 4a. The impurities accumulated in the arc section 4g can be washed to the port near the other side wall of the purification cooling pool 2 by the high-pressure water for collection and treatment.

[0061] In this embodiment, the cooling capillary tube 4e can preferably be a cooling pipe with a diameter of 50 mm, which ensures the use strength and has a large filtering and cooling contact area. The purification cooling structure of this embodiment is easy to implement and has strong engineering practicability.

[0062] Although the present invention is disclosed as above, the protection scope of the present invention 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 these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A hot-rolled strip steel cooling circulating water treatment system, characterized in that, It includes a collecting tank (1), a purification and cooling tank (2) and a storage tank (3). The collecting tank (1) is arranged below the laminar flow cooling device (8). The lower end of the collecting tank (1) is communicated with the lower end of the purification and cooling tank (2). The upper end of the purification and cooling tank (2) is communicated with the upper end of the storage tank (3). A filtering and cooling module (4) is provided in the purification and cooling tank (2), and the filtering and cooling module (4) is used for filtering and cooling the cooling circulating water.

2. The hot-rolled strip steel cooling circulating water treatment system according to claim 1, characterized in that, The filtering and cooling module (4) includes a plurality of cooling tubes (4a). Each cooling tube (4a) is hollow and is arranged along the height direction of the purification and cooling tank (2). A cooling medium (5) flows in the side wall of each cooling tube (4a).

3. The hot-rolled strip steel cooling circulating water treatment system according to claim 2, wherein The plurality of cooling tubes (4a) are arranged closely, and the end faces of the plurality of cooling tubes (4a) are in a honeycomb shape.

4. The hot-rolled strip steel cooling circulating water treatment system according to claim 2, characterized in that, The cooling and filtering module (4) further includes a filtering brush head (4b), and the filtering brush head (4b) is arranged axially in the cooling tube (4a).

5. The hot-rolled strip steel cooling circulating water treatment system according to claim 1, wherein The filtering and cooling module (4) includes a plurality of cooling tubes (4a). Each cooling tube (4a) is formed by winding a winding tube (4c) in a spiral track. The cooling tube (4a) is arranged along the height direction of the purification and cooling tank (2). A cooling medium (5) flows in each winding tube (4c), and a filtering gap (4d) is provided between every two adjacent winding tubes (4c).

6. The hot-rolled strip steel cooling circulating water treatment system according to claim 5, wherein, The inner diameter of each cooling tube (4a) changes along the axial direction.

7. The hot-rolled strip steel cooling circulating water treatment system according to claim 1, wherein The filtering and cooling module (4) includes multiple layers of cooling tube groups spaced along the height direction of the purification and cooling tank (2). Each layer of cooling tube group includes a plurality of cooling tubes (4a) arranged along the length direction of the purification and cooling tank (2); Each cooling tube (4a) is formed by closely arranging a plurality of cooling fine tubes (4e). Each cooling fine tube (4e) extends along the width direction of the purification and cooling tank (2). A filtering gap (4d) is provided between every two adjacent cooling fine tubes (4e). A cooling medium (5) flows in each cooling fine tube (4e).

8. The hot-rolled strip steel cooling circulating water treatment system according to claim 7, characterized in that, At least one layer of the cooling tubes (4a) in the cooling tube group is in a U shape with an upward opening or a downward opening. In the same layer of cooling tube group, the cooling tubes (4a) with upward openings are located on the lower side, and the cooling tubes (4a) with downward openings are located on the upper side. The cooling tubes (4a) with downward openings and the cooling tubes (4a) with upward openings are arranged alternately. Each cooling tube (4a) includes two vertical sections (4f) and an arc section (4g). The two vertical sections (4f) of each cooling tube (4a) are respectively located inside two adjacent cooling tubes (4a).

9. The hot-rolled strip steel cooling circulating water treatment system according to claim 1, characterized in that, A sludge hopper (6) is provided below the purification and cooling tank (2).

10. The hot-rolled strip steel cooling circulating water treatment system according to any one of claims 1-9, characterized in that, It further includes a backwashing device, and the backwashing device is used for washing the cooling and filtering module (4).

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