Laminar flow cooling header deslagging and anti-blocking device and deslagging and anti-blocking method

Abstract

The invention discloses a deslagging and anti-blocking device and a deslagging and anti-blocking method for a laminar cooling header. The deslagging anti-blocking device is arranged between a laminar flow water inlet pipe and a laminar flow collecting pipe and comprises a deslagging anti-blocking box, and a plurality of grating plates which are arranged at intervals in the water flow direction of cooling water and are lower than the top of a box body of the deslagging anti-blocking box are arranged at the bottom of the box body of the deslagging anti-blocking box; the cooling water inlet end and the cooling water outlet end of the deslagging anti-blocking box are communicated with a forward flushing valve and a reverse flushing valve respectively, and the bottom end of the deslagging anti-blocking box is communicated with a forward deslagging valve and a reverse deslagging valve respectively; the end part of each group of laminar flow collecting pipes is communicated with a collecting pipe flushing valve, the end parts of the branch collecting pipe flushing valves are gathered and then communicated with a flushing system electromagnetic valve, and the end part of the flushing system electromagnetic valve is communicated with a high-pressure side water spraying pipeline arranged on one side of the laminar flow roller way. The device is easy to install, use and maintain, the existing layout of a laminar cooling system is not changed, field conditions are fully utilized, and the problem of accumulated slag blockage of the collecting pipe is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hot rolling steel rolling, and particularly to a slag removal and blockage prevention device and method for a laminar cooling header. Background Art

[0002] The laminar cooling system is a key process in the hot rolling production line, and its cooling capacity and cooling uniformity are crucial for quality factors such as strip shape, CT temperature, and performance. The core equipment of this system is the control valve and the upper and lower spray headers, which are used to cool the upper and lower surfaces of the moving steel strip. The process requires that the upper and lower flow rates are ejected according to the designed ratio, and at the same time, the water head height of the same header is uniform in the width direction of the strip, that is, the flow rate distribution is uniform in the width direction, so as to achieve uniform temperature across the cross-section of the strip and the same overall performance.

[0003] Relatively easy to meet the above process requirements in theoretical design, but in actual operation, due to the following reasons (the scale produced by the laminar process is fine, the number of header devices is large and the layout is complex, the roller table is lubricated with dry oil, debris is inevitably brought in during equipment maintenance, the side filtration process of laminar cooling water treatment, and the laminar scale pit and cooling tower are easily affected by the outside), the header, especially the small nozzle header, is very easy to produce slag accumulation and nozzle blockage, which causes uneven flow rate in the width direction of the strip, and even a few nozzles have no water, ultimately affecting the product quality, such as turtle back, camber, and longitudinal cutting side bend.

[0004] In the prior art, when slag accumulates in the upper and lower headers or the nozzles are blocked, generally, the header is removed from the laminar cooling system, pickled, and then reinstalled and operated. This cleaning method is not only time-consuming and laborious, but also the number of headers to be cleaned is very large, and it is often impossible to carry out. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention proposes a slag removal and blockage prevention device and method for a laminar cooling header. The device is simply designed, easy to install and use, and the operation method is convenient and practical. It can quickly realize the clean and unobstructed operation of the laminar header, effectively solve the problems of slag accumulation and blockage of the laminar header, improve the cooling uniformity of the laminar cooling, and further improve the quality of the steel strip product.

[0006] To achieve the above object, a slag removal and blockage prevention device for a laminar cooling header designed by the present invention is arranged between the laminar inlet pipe and the laminar header of each laminar cooling branch of the laminar cooling system. The special feature is that it includes a slag removal and blockage prevention box, and the cooling water inlet end of the slag removal and blockage prevention box is connected with a short inlet pipe, and the cooling water outlet end is connected with a short outlet pipe;

[0007] The short inlet pipe is connected with the laminar inlet pipe, and the short outlet pipe is connected with the laminar header;

[0008] A plurality of grid plates are arranged at the bottom of the slag removal and blockage prevention box body at intervals along the cooling water flow direction and with a height lower than the top of the slag removal and blockage prevention box body. Among them, the first grid plate along the cooling water flow direction has the highest height, the second grid plate has the lowest height, and the heights of the third... to the last grid plate gradually increase in turn;

[0009] The grid plate includes a water passing grid at the upper part of the plate and a flushing hole at the bottom end of the plate;

[0010] A forward flushing valve and a reverse flushing valve are respectively connected to the cooling water inlet and outlet ends of the slag removal and blockage prevention box, and a forward slag discharge valve and a reverse slag discharge valve are respectively connected to the bottom end of the slag removal and blockage prevention box;

[0011] The end of the laminar flow header of each group of laminar cooling branches is connected with a header flushing valve. After the ends of the header flushing valves of each branch are aggregated, they are connected with a flushing system solenoid valve, and the end of the flushing system solenoid valve is connected with a high-pressure side water spraying pipeline arranged on one side of the hot rolling laminar flow roller table.

[0012] Further, the slag removal and blockage prevention device is connected to the laminar flow inlet pipe and the laminar flow header through flanges.

[0013] Furthermore, the width of the slag removal and blockage prevention box body is greater than the diameter of the inlet short pipe, and the height of the box body is several times the diameter of the inlet short pipe.

[0014] Furthermore, the top of the slag removal and blockage prevention box body adopts a sealed flange cover plate.

[0015] Furthermore, the bottom ends of the water passing grids corresponding to the first grid plate to the last grid plate are of the same height, and the top ends gradually increase in height, so as to improve the water passing capacity of the cooling water.

[0016] The present invention also designs a method for removing slag and preventing blockage of a laminar cooling header, which is applicable to the laminar cooling header slag removal and blockage prevention device as described above, and is characterized in that it includes the following steps:

[0017] S1) When the laminar cooling system is running normally, the forward flushing valve, the reverse flushing valve, the forward slag discharge valve, the reverse slag discharge valve, the header flushing valve, and the flushing system solenoid valve are all kept in a closed state. The low-pressure cooling water enters from the laminar flow inlet pipe, flows through the slag removal and blockage prevention device, and the impurities in the cooling water precipitate in the slag removal and blockage prevention box due to gravity and speed reduction. The cooled water after slag removal flows into the laminar flow header and then sprays out to cool the hot rolling steel strip;

[0018] S2) When the laminar flow cooling system is shut down, the pump group of the laminar flow high-pressure side spraying system remains in operation. First, open the solenoid valve of the flushing system, and then, according to the slag removal and anti-blocking requirements of a certain laminar flow cooling branch, open the header flushing valve, the forward slag discharge valve, and the reverse slag discharge valve on this laminar flow cooling branch. At the same time, close the low-pressure cooling water inlet valve on this laminar flow cooling branch. Then, the accumulated slag in the laminar flow header is flushed into the slag removal and anti-blocking device and finally discharged from the slag removal and anti-blocking box.

[0019] Further, in step S2), the flushing time of the laminar flow header is 15 - 30 min.

[0020] Furthermore, in step S2), the laminar flow header is flushed in two ways. One is periodic cleaning. According to operating experience, determine a flushing cycle. The other is status flushing. According to the inspection of the water head and water volume of the header, flush the laminar flow header with deteriorated status.

[0021] Furthermore, in step S2), when flushing the slag removal and anti-blocking device, close the header flushing valve on the corresponding laminar flow cooling branch, open the forward flushing valve, the reverse flushing valve, the forward slag discharge valve, and the reverse slag discharge valve. Connect the high-pressure side spraying water to the forward flushing valve and the reverse flushing valve. The high-pressure flushing water flows through the flushing holes to flush the slag removal and anti-blocking device, and finally discharge the slag through the forward slag discharge valve and the reverse slag discharge valve.

[0022] The advantages of the present invention are as follows:

[0023] 1. Based on the existing equipment, the present invention installs a slag removal and anti-blocking device between the cooling water inlet pipe and the header to solve the problems of accumulated slag and anti-blocking in the header. The design of the slag removal and anti-blocking device for the laminar flow cooling header is simple. It makes full use of the on-site conditions with little modification, which is convenient for installation and use, and improves the function of the original equipment.

[0024] 2. For the slag removal and anti-blocking device of the laminar flow cooling header of the present invention, grid plates with different heights are arranged at the bottom of the slag removal and anti-blocking box. The height of the first grid plate along the water flow direction is the highest, which forms an overflow weir form in combination with the box body. Using the principle of the overflow weir, the low-pressure cooling water generates precipitation due to gravity. The height of the second grid plate is the lowest, and the heights of the third... to the last grid plate gradually increase in turn. Using the mechanism of the slow-resistance sedimentation tank, the low-pressure cooling water generates precipitation due to the reduction of speed to achieve slag removal. The water passing through the overflow weir is discharged from the box body after slow resistance and then enters the header, thus preventing the header from being blocked.

[0025] 3. The slag removal and anti-blocking device for the laminar cooling header of the present invention is respectively provided with forward and reverse flushing valves and forward and reverse slag discharge valves. At the same time, the present invention sets a header flushing valve at the end of the laminar header of each laminar cooling branch. After the header flushing valves of each branch are aggregated, they are connected to the flushing system solenoid valve, and the flushing system solenoid valve is connected to the high-pressure side water spraying pipeline in the on-site conditions. When the machine stops, the cleaning and maintenance of the laminar header and the slag removal and anti-blocking device are completed by high-pressure side water spraying and operating the valves.

[0026] 4. The slag removal and anti-blocking method for the laminar cooling header of the invention is simple in operation and small in maintenance amount.

[0027] The slag removal and anti-blocking device and method for the laminar cooling header of the present invention are installed between the laminar water inlet pipe and the laminar header in each branch pipe of the laminar cooling system. The installation, use, and maintenance are simple, and the existing layout of the laminar cooling system is not changed. The on-site conditions are fully utilized to solve the problem of slag accumulation and blockage in the header. On the one hand, when the system is running, the slag removal problem before the low-temperature cooling water enters the laminar header can be solved, realizing the clean and unobstructed operation of the laminar header, improving the uniformity of laminar cooling, and further improving the quality of strip steel products. On the other hand, when the system stops, the cleaning and maintenance of the laminar header and the slag removal and anti-blocking device can be completed by operating the valves and high-pressure side water spraying. The high-pressure side water spraying takes the source nearby to ensure the sustainability of use. Description of the Drawings

[0028] Figure 1 is the plan layout diagram of the slag removal and anti-blocking device for the laminar cooling header of the present invention in the laminar cooling system;

[0029] Figure 2 is Figure 1 the structural schematic diagram of the slag removal and anti-blocking device in

[0030] Figure 3 is Figure 2 the structural schematic diagram of the grille plate in

[0031] Figure 4 is the flow chart of the slag removal and anti-blocking method for the laminar cooling header of the present invention (cooling water impurity removal);

[0032] Figure 5 is the flow chart of the slag removal and anti-blocking method for the laminar cooling header of the present invention (cleaning the laminar header);

[0033] Figure 6 is the flow chart of the slag removal and anti-blocking method for the laminar cooling header of the present invention (cleaning the slag removal and anti-blocking device);

[0034] In the figure: laminar water inlet pipe 1, slag removal and anti-blocking device 2, laminar header 3, header flushing valve 4, flushing system solenoid valve 5;

[0035] The slag removal and anti-blocking device 2 includes: a water inlet short pipe 2-1, a slag removal and anti-blocking box 2-2, a water outlet short pipe 2-3, a grid plate 2-4, a forward flushing valve 2-5, a reverse flushing valve 2-6, a forward slag discharge valve 2-7, and a reverse slag discharge valve 2-8;

[0036] The grid plate 2-4 includes: a water passing grid 2-41 and flushing holes 2-42. Specific embodiments

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] In the description of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0039] As Figure 1 shown, a laminar flow cooling header slag removal and anti-blocking device 2 of the present invention is arranged between the laminar flow inlet pipe 1 and the laminar flow header 3 of each laminar flow cooling branch of the laminar flow cooling system.

[0040] Preferably, the slag removal and anti-blocking device 2 is connected to the laminar flow inlet pipe 1 and the laminar flow header 3 by flanges, which is convenient for installation, disassembly and maintenance without changing the existing equipment.

[0041] As Figure 2 shown, the slag removal and anti-blocking device 2 includes a slag removal and anti-blocking box 2-2. The cooling water inlet end of the slag removal and anti-blocking box 2-2 is communicated with a water inlet short pipe 2-1, and the cooling water outlet end is communicated with a water outlet short pipe 2-3. The water inlet short pipe 2-1 is communicated with the laminar flow inlet pipe 1, and the water outlet short pipe 2-3 is communicated with the laminar flow header 3. Specifically, the water inlet short pipe 2-1 is communicated with the laminar flow inlet pipe 1 by a flange, and the water outlet short pipe 2-3 is communicated with the laminar flow header 3 by a flange.

[0042] Preferably, the width of the box body of the slag removal and anti-blocking box 2-2 is greater than the diameter of the water inlet short pipe 2-1, and the height of the box body is several times the diameter of the water inlet short pipe 2-1. The specific size can be modified according to the on-site conditions.

[0043] The bottom of the slag removal and anti-blocking box 2-2 is provided with a plurality of grating plates 2-4 arranged at intervals along the direction of cooling water flow and lower in height than the top of the slag removal and anti-blocking box 2-2. Among them, the first grating plate 2-4 along the direction of cooling water flow has the highest height, the second grating plate 2-4 has the lowest height, and the third ... to the last grating plate 2-4 have gradually increasing heights.

[0044] The first grid plate is the highest and is combined with the box to form an overflow weir. Using the overflow weir principle, the cooling water is precipitated due to gravity. The second grid plate is the shortest, and the third... to the last grid plate, the heights gradually increase. Using the slow resistance sedimentation tank mechanism, the cooling water is precipitated due to the speed reduction, thereby achieving slag removal. The water passing through the overflow weir is discharged from the box after slow resistance and then enters the header to prevent header blockage.

[0045] The grille design ensures sufficient water flow capacity. The grille plates are in different positions and are staggered in the box to improve the interception capacity. At the same time, because the height of each grille plate is different, the height of the grille holes is also different and gradually increases to improve the water flow capacity.

[0046] Preferably, a sealing flange cover is used on the top of the slag removal and anti-blocking box 2-2 to facilitate installation, disassembly and cleaning.

[0047] like Figure 3 As shown, the grid plate 2-4 includes a water grid 2-41 located at the upper part of the plate and a flushing hole 2-42 located at the bottom of the plate. The water grid 2-41 is designed to ensure sufficient water flow capacity, and the flushing hole 2-42 is a water inlet and slag discharge channel for cleaning and maintenance.

[0048] Preferably, the bottom heights of the water gate 2-41 corresponding to the first grid plate 2-4 to the water gate 2-41 corresponding to the last grid plate 2-4 are consistent, and the top heights gradually increase, so as to improve the water passing capacity of cooling water.

[0049] The water inlet and outlet ends of the slag removal and anti-blocking box 2-2 are connected to the forward flushing valve 2-5 and the reverse flushing valve 2-6 respectively, and the bottom end of the slag removal and anti-blocking box 2-2 is connected to the forward slag discharge valve 2-7 and the reverse slag discharge valve 2-8 respectively. The end of the laminar flow header 3 of each group of laminar cooling branches is connected to the header flushing valve 4, and the ends of the header flushing valves 4 of each branch are connected to the flushing system solenoid valve 5 after being collected, and the end of the flushing system solenoid valve 5 is connected to the high-pressure side water spraying pipe arranged on one side of the laminar flow roller.

[0050] Except for the solenoid valve 5 of the flushing system, all the above valves are manual valves. If solenoid valves or pneumatic valves are used, full automatic control can be achieved.

[0051] The present invention also designs a slag removal and blockage prevention method for a laminar cooling header, which is applicable to the above-mentioned slag removal and blockage prevention device for a laminar cooling header, such as Figures 4 to 6 shown, and includes the following steps:

[0052] S1) When the laminar cooling system is running normally, the forward flushing valve 2-5, reverse flushing valve 2-6, forward slag discharge valve 2-7, reverse slag discharge valve 2-8, header flushing valve 4, and flushing system solenoid valve 5 are all kept closed. The low-pressure cooling water enters from the laminar water inlet pipe 1, flows through the slag removal and blockage prevention device 2, and impurities in the cooling water precipitate in the slag removal and blockage prevention box 2-2 due to gravity and speed reduction. The cooled water after slag removal flows into the laminar header 3 and then sprays out to cool the hot-rolled steel strip.

[0053] S2) When the laminar cooling system stops, the laminar high-pressure side spray system pump set remains in operation. First, the flushing system solenoid valve 5 is opened, and then according to the slag removal and blockage prevention requirements of a certain laminar cooling branch, the header flushing valve 4, forward slag discharge valve 2-7, and reverse slag discharge valve 2-8 on this laminar cooling branch are opened. At the same time, the low-pressure cooling water inlet valve on this laminar cooling branch is closed, so that the accumulated slag in the laminar header 3 is flushed into the slag removal and blockage prevention device 2 and finally discharged from the slag removal and blockage prevention box 2-2.

[0054] Specifically, the flushing time of the laminar header 3 is 15 - 30 min.

[0055] Specifically, there are two ways to flush the laminar header 3. One is periodic cleaning, and a flushing cycle is determined based on long-term basic operation experience. The other is status flushing, and the laminar header 3 with deteriorated status is flushed according to the inspection of the water head and water volume of the header.

[0056] In addition, when flushing the slag removal and blockage prevention device 2, the header flushing valve 4 on the corresponding laminar cooling branch is closed, the forward flushing valve 2-5, reverse flushing valve 2-6, forward slag discharge valve 2-7, and reverse slag discharge valve 2-8 are opened, and the high-pressure side spray water is connected to the forward flushing valve 2-5 and reverse flushing valve 2-6. The high-pressure flushing water flows through the flushing holes 2-42 to flush the slag removal and blockage prevention device 2, and finally discharges the slag through the forward slag discharge valve 2-7 and reverse slag discharge valve 2-8.

[0057] After the slag removal and blockage prevention device 2 is cleaned, the valve states during operation are restored.

[0058] The high-pressure side spray water is used to spray pressure water from above the hot-rolled steel strip side to blow and sweep the upper surface of the hot-rolled strip. In the present invention, the high-pressure side spray water is taken nearby as the flushing water. In this embodiment, the low-pressure cooling water has a pressure of 0.7 bar and is used for spraying and cooling the upper and lower laminar headers; the high-pressure side spray water has a pressure of 10 bar, and the drained water returns to the laminar iron gutter.

[0059] In this embodiment, the nominal diameters of the forward flushing valve 2-5, reverse flushing valve 2-6, forward slag discharging valve 2-7, and reverse slag discharging valve 2-8 are DN50-80, which are used for periodic group circulation cleaning and maintenance to ensure their sustainable use, generally carried out during shutdown. The nominal diameters of the header flushing valve 4 and the flushing system solenoid valve 5 are DN40 and DN100 respectively, which are used to flush the fine sediment in the header after long-term operation.

[0060] When the laminar flow system is operating normally, the forward flushing valve 2-5, reverse flushing valve 2-6, forward slag discharging valve 2-7, and reverse slag discharging valve 2-8 shall not be opened; otherwise, since the forward slag discharging valve 2-7 and reverse slag discharging valve 2-8 are in a pressure relief state, the jet head of the header will decrease or even there may be no water, and the cooling function cannot be effectively completed, seriously affecting the product cooling effect and even the product performance; it may also be because the forward flushing valve 2-5 and reverse flushing valve 2-6 are in an open state, and the high-pressure side water spray rushes into the header, resulting in a high water head and large flow rate of the header cooling water, and over-cooling affects the product performance; nor shall the header flushing valve 4 and the flushing system solenoid valve 5 be opened, otherwise, it may cause a high water head and large flow rate of the cooling water due to the side water spray rushing into the header, which also affects the product performance.

[0061] This embodiment takes a hot rolling laminar flow system with an annual production capacity of 4.5 million tons as an example.

[0062] The installation position of the slag removal and anti-blocking device is between the inlet pipe of the lower header of the laminar flow and the lower header of the laminar flow. The length of the slag removal and anti-blocking box 2-2 is 1000 mm, the width is 150 mm, and the height is 500 mm. Six grid plates are arranged in the slag removal and anti-blocking box 2-2. The height of the first grid plate is 400 mm, and the heights of the subsequent grid plates are 200 mm, 230 mm, 260 mm, 290 mm, and 320 mm in sequence. Five grid bar holes are evenly arranged on each grid plate, and the area is ≧40 cm 2 (5*8). The bottom DN80 semi-circular flushing hole is the water inlet and slag discharge channel for cleaning and maintenance. A set of forward flushing valve 2-5, reverse flushing valve 2-6, a set of forward slag discharging valve 2-7, and reverse slag discharging valve 2-8 are respectively arranged at the front and back of the slag removal and anti-blocking box 2-2, with a nominal diameter of DN80. The flushing water source is the high-pressure side water spray with a pressure of 10 bar. The cleaning is only carried out when the laminar flow system is shut down.

[0063] When the laminar flow system is shut down, periodic flushing is carried out with a period of 4 weeks. Keep the pump group of the laminar flow side spray system running, with a system pressure of 10 bar. First, open the solenoid valve 5 of the DN100 flushing system, open the header DN40 header flushing valve 4 in groups, and at the same time close the low-pressure inlet valve of the header, open the forward slag discharge valve 2-7 and the reverse slag discharge valve 2-8. Then the accumulated slag in the header is flushed into the slag removal and anti-blocking device, and the flushing time is ensured to be 30 minutes. Then close the header flushing valve 4, open the forward flushing valve 2-5 and the reverse flushing valve 2-6 respectively, and alternately flush at 10-minute intervals, so as to discharge the sundries intercepted by the slag removal and anti-blocking box during operation and the accumulated slag flushed into the header. After flushing each group is completed, close the solenoid valve 5 of the flushing system.

[0064] When the laminar flow system is shut down, status flushing is carried out. The flushing steps are the same as those of the periodic flushing operation, except that according to the records during on-site inspection, a certain branch header and the slag removal and anti-blocking device are selectively flushed.

[0065] After the implementation of this embodiment, it has fundamentally changed the situation that the lower spray header of the original laminar flow causes uneven water spraying and cooling in the cross-section of the strip steel due to accumulated slag, basically eliminated the strip steel side bending fault caused by uneven cooling, and reduced the quality risk of unqualified product performance.

[0066] The slag removal and anti-blocking device and method for the laminar cooling header of the present invention. The device is installed between the laminar water inlet pipe and the laminar header in each branch pipe of the laminar cooling system. It is simple to install, use and maintain, does not change the existing layout of the laminar cooling system, makes full use of the on-site conditions, and solves the problem of accumulated slag blocking in the header. On the one hand, when the system is running, it can solve the slag removal problem before the low-temperature cooling water enters the laminar header, realize the clean and unobstructed operation of the laminar header, improve the uniformity of laminar cooling, and thus improve the quality of strip steel products; on the other hand, when the system is shut down, the cleaning and maintenance of the laminar header and the slag removal and anti-blocking device can be completed by operating the valves and spraying water from the high-pressure side. The high-pressure side water spraying takes the source nearby to ensure the sustainability of use.

[0067] The slag removal and anti-blocking device and method for the laminar cooling header of the present invention. The device is installed between the laminar water inlet pipe and the laminar header in each branch pipe of the laminar cooling system. It is simple to install, use and maintain, does not change the existing layout of the laminar cooling system, makes full use of the on-site conditions, and solves the problem of accumulated slag blocking in the header. On the one hand, when the system is running, it can solve the slag removal problem before the low-temperature cooling water enters the laminar header, realize the clean and unobstructed operation of the laminar header, improve the uniformity of laminar cooling, and thus improve the quality of strip steel products; on the other hand, when the system is shut down, the cleaning and maintenance of the laminar header and the slag removal and anti-blocking device can be completed by operating the valves and spraying water from the high-pressure side. The high-pressure side water spraying takes the source nearby to ensure the sustainability of use.

[0068] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A slag removal and blockage prevention device for a laminar cooling header is arranged between a laminar water inlet pipe (1) and a laminar header (3) of each laminar cooling branch in a laminar cooling system, and is characterized in that: It includes a slag removal and anti-blocking box (2-2), and a water inlet short pipe (2-1) is connected to the cooling water inlet end of the slag removal and anti-blocking box (2-2), and a water outlet short pipe (2-3) is connected to the cooling water outlet end. The water inlet short pipe (2-1) is connected to the laminar flow inlet pipe (1), and the water outlet short pipe (2-3) is connected to the laminar flow header (3). At the bottom of the box body of the slag removal and anti-blocking box (2-2), there are a plurality of grid plates (2-4) arranged at intervals along the cooling water flow direction and with a height lower than the top of the box body of the slag removal and anti-blocking box (2-2). Among them, the first grid plate (2-4) along the cooling water flow direction has the highest height, the second grid plate (2-4) has the lowest height, and the heights of the third... to the last grid plate (2-4) gradually increase in turn. The grid plate (2-4) includes a water passing grid (2-41) located at the upper part of the plate and a flushing hole (2-42) located at the bottom end of the plate. A forward flushing valve (2-5) and a reverse flushing valve (2-6) are respectively connected to the cooling water inlet and outlet ends of the slag removal and anti-blocking box (2-2), and a forward slag discharge valve (2-7) and a reverse slag discharge valve (2-8) are respectively connected to the bottom end of the slag removal and anti-blocking box (2-2). At the end of the laminar flow header (3) of each group of laminar flow cooling branches, a header flushing valve (4) is connected. After the ends of the header flushing valves (4) of each branch are aggregated, they are connected to a flushing system solenoid valve (5), and the end of the flushing system solenoid valve (5) is connected to a high-pressure side water spraying pipeline arranged on one side of the hot rolling laminar flow roller table.

2. The slag removal and anti-blocking device for laminar flow cooling headers according to claim 1, wherein: The slag removal and anti-blocking device is connected to the laminar flow inlet pipe (1) and the laminar flow header (3) through flanges.

3. The slag removal and anti-blocking device for the laminar flow cooling header according to claim 2, characterized in that: The width of the box body of the slag removal and anti-blocking box (2-2) is greater than the diameter of the water inlet short pipe (2-1), and the height of the box body is several times the diameter of the water inlet short pipe (2-1).

4. The laminar flow cooling header slag removal and blockage prevention device according to claim 3, characterized in that: The top of the box body of the slag removal and anti-blocking box (2-2) adopts a sealed flange cover plate.

5. The laminar flow cooling header slag removal and blockage prevention device according to claim 4, wherein: From the bottom end of the water passing grid (2-41) corresponding to the first grid plate (2-4) to the bottom end of the water passing grid (2-41) corresponding to the last grid plate (2-4), the heights are the same, and the top heights gradually increase, which is used to improve the water passing capacity of the cooling water.

6. A slag removal and blockage prevention method for a laminar flow cooling header, applicable to the slag removal and blockage prevention device of the laminar flow cooling header as described in claims 1 to 5, characterized in that, It includes the following steps: S1) When the laminar flow cooling system is running normally, the forward flushing valve (2-5), the reverse flushing valve (2-6), the forward slag discharge valve (2-7), the reverse slag discharge valve (2-8), the header flushing valve (4), and the flushing system solenoid valve (5) are all kept in the closed state. The low-pressure cooling water enters from the laminar flow inlet pipe (1), flows through the slag removal and anti-blocking device (2), and the impurities in the cooling water precipitate in the slag removal and anti-blocking box (2-2) due to gravity and speed reduction. The cooled water after slag removal flows into the laminar flow header (3), and then sprays out to cool the hot rolling steel strip. When the laminar flow cooling system shuts down, the pump group of the high-pressure side spraying system of the laminar flow remains in the running state. First, open the solenoid valve (5) of the flushing system, and then, according to the slag removal and anti-blocking requirements of a certain laminar flow cooling branch, open the header flushing valve (4), the forward slag discharge valve (2-7) and the reverse slag discharge valve (2-8) on this laminar flow cooling branch. At the same time, close the low-pressure cooling water inlet valve on this laminar flow cooling branch. Then, the accumulated slag in the laminar flow header (3) is flushed into the slag removal and anti-blocking device (2) and finally discharged from the slag removal and anti-blocking box (2-2).

7. The slag removal and blockage prevention method of the laminar flow cooling header according to claim 6, characterized in that: In step S2), the flushing time of the laminar flow header (3) is 15 - 30 min.

8. The slag removal and blockage prevention method for the laminar flow cooling header according to claim 7, characterized in that: In step S2), the laminar flow header (3) is flushed in two ways. One is periodic cleaning, and a flushing cycle is determined according to operation experience. The other is status flushing, and the laminar flow header (3) with deteriorated status is flushed according to the water head and water volume of the inspection header.

9. The slag removal and anti-blocking method for the laminar flow cooling header according to claim 8, characterized in that: In step S2), when flushing the slag removal and anti-blocking device (2), close the header flushing valve (4) on the corresponding laminar flow cooling branch, open the forward flushing valve (2-5), the reverse flushing valve (2-6), the forward slag discharge valve (2-7) and the reverse slag discharge valve (2-8). Connect the high-pressure side water spraying to the forward flushing valve (2-5) and the reverse flushing valve (2-6). The high-pressure flushing water flows through the flushing holes (2-42) to flush the slag removal and anti-blocking device (2), and finally discharge the slag through the forward slag discharge valve (2-7) and the reverse slag discharge valve (2-8).

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