Optimized energy-saving system for strip laminar cooling

Abstract

The application discloses a kind of optimization energy-saving systems of strip steel laminar flow cooling, including laminar flow cold water pool and laminar flow hot water pool, double-suction pump is installed in the lower part of laminar flow hot water pool side, the outlet of double-suction pump is connected with several cooling towers by micro-resistance butterfly check valve, cooling tower is communicated with laminar flow cold water pool, laminar flow cold water pool is connected with several first side spray pipe groups, water collecting pool is arranged below first side spray pipe group, shunt plate is installed in water collecting pool, cold clean backwater pipe is arranged between the upper portion of shunt plate and laminar flow cold water pool in water collecting pool, water collecting pool is communicated with laminar flow hot water pool in the lower portion of shunt plate, hot dirty water and cold clean water are separated by shunt plate, cold clean water directly flows to laminar flow cold water pool, does not pass laminar flow hot water pool and cooling tower, reduces the processing capacity of cooling tower, hot dirty water is sent to cooling tower by double-suction pump, double-suction pump is installed by low self-filling water mode, reduces the consumption of pump, saves electric energy.

Description

Technical Field

[0001] This invention relates to the field of steel coil production technology, specifically to an optimized energy-saving system for laminar flow cooling of strip steel. Background Technology

[0002] Steel billets received from the steel mill serve as raw materials for hot rolling. The billets are fed into a heating furnace and heated to a suitable rolling temperature, typically above the recrystallization temperature, to improve the steel's plasticity and reduce its resistance to deformation. The heated billets are then pre-rolled on a roughing mill to form a thicker steel strip. This rough-rolled strip is then fed into a finishing mill for further rolling to achieve the required thickness and dimensional accuracy. The finished strip is then cooled using a laminar flow cooling system.

[0003] In related technologies, when strip steel is finished and rolled to the coiling room, it undergoes laminar flow cooling to lower its temperature. The laminar flow cooling water and side spray water do not stop flowing when no strip steel is passing through. At this time, the low-temperature and clean water will flow directly back to the hot water tank, mix with the hot and dirty water after use, and then be pressurized and filtered by three lift pumps before being lifted to the cooling tower for cooling. This not only greatly increases the amount of water used for lifting, filtering, and cooling, but also significantly reduces the efficiency of filtering and cooling. Obviously, this is a huge waste of energy. Summary of the Invention

[0004] The purpose of this invention is to provide an optimized energy-saving system for laminar flow cooling of strip steel to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an optimized energy-saving system for laminar flow cooling of steel strip, comprising a laminar flow cold water tank and a laminar flow hot water tank, wherein a double-suction pump is installed on the lower side of the laminar flow hot water tank, and the outlet of the double-suction pump is connected to several cooling towers through a micro-resistance butterfly check valve, wherein the cooling towers are connected to the laminar flow cold water tank.

[0006] The laminar flow cold water tank is connected to several first side spray pipe groups. A water collection tank is provided below the first side spray pipe groups. A diversion plate is installed inside the water collection tank. A cold clean water return pipe is provided in the water collection tank and between the upper part of the diversion plate and the laminar flow cold water tank. The water collection tank and between the lower part of the diversion plate are connected to the laminar flow hot water tank.

[0007] When the strip steel is not cooled, the low-temperature clean water flows directly to the laminar flow cold water tank, avoiding the laminar flow hot water tank. The amount of water that needs to be lifted, filtered and cooled is reduced. The water is pressurized by a double suction pump, which is more energy-efficient and reduces the number of pumps used.

[0008] Furthermore, the laminar flow hot water tank is connected to a hot dirty water return tank, which is connected to the collection tank through a hot dirty water return pipe. The water used to rinse the steel strip flows into the hot dirty water return tank and then enters the laminar flow hot water tank, where it waits to be filtered and cooled before being reused.

[0009] Furthermore, a backup pump is installed between the laminar flow hot water tank and the double-suction pump. The backup pump is equipped with a first valve. When the double-suction pump needs maintenance, the backup pump can send hot dirty water to the cooling tower to replenish the laminar flow cold water tank with clean cold water.

[0010] Furthermore, the plurality of cooling towers are connected to a main discharge pipe, which is connected to a laminar flow cold water pool through branch pipes, allowing clean, low-temperature water to be quickly replenished to the laminar flow cold water pool to provide water for the cooling of the strip steel.

[0011] Furthermore, an auxiliary pool is provided on the side of the water collection pool, and the laminar flow cold water pool is connected to a second side spray pipe assembly, which is matched with the auxiliary pool. The auxiliary pool is connected to the cooling tower through a suction pump and an auxiliary pipe, which can improve the cooling effect of the strip steel and send water to the cooling tower separately, thus shortening the route.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] (1) In the water collection pool, hot dirty water and cold clean water are separated by the diversion plate. When no strip steel is cooled, the cold clean water sprayed by the first side nozzle group flows directly to the laminar flow cold water pool without passing through the laminar flow hot water pool and cooling tower, reducing the processing capacity of the cooling tower and reducing the operation of one booster pump.

[0014] (2) A double-suction pump is used to deliver hot dirty water to the cooling tower. The core parameters of the double-suction pump are selected to be closest to the actual working conditions. It is installed in a low-level self-priming mode and equipped with a low-resistance butterfly check valve. As the only working pump, the pump usage is reduced and the power is saved. Attached Figure Description

[0015] Figure 1 This is a flowchart of the present invention.

[0016] In the diagram: 1. Laminar flow cold water tank; 2. Suction pump; 3. Collection tank; 4. Auxiliary tank; 5. Auxiliary pipe; 6. First side spray nozzle assembly; 7. Cold clean return water pipe; 8. Hot dirty return water pipe; 9. Hot dirty return water tank; 10. Laminar flow hot water tank; 11. Standby pump; 12. Standby pipe; 13. Double suction pump; 14. Main discharge pipe; 15. Branch pipe; 16. Cooling tower; 17. Diverter plate; 18. First valve; 19. Second valve; 20. Second side spray nozzle assembly; 21. Low-resistance butterfly check valve. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example:

[0019] Please see Figure 1 The present invention provides a technical solution: an optimized energy-saving system for laminar flow cooling of steel strip, including a laminar flow cold water tank 1 and a laminar flow hot water tank 10. A double suction pump 13 is installed on the lower side of the laminar flow hot water tank 10. The outlet of the double suction pump 13 is connected to several cooling towers 16 through a micro-resistance butterfly check valve 21. The cooling towers 16 are connected to the laminar flow cold water tank 1.

[0020] Based on the actual working conditions, a double-suction pump 13 with matching parameters is selected. The double-suction pump 13 is located on the lower side of the laminar flow hot water tank 10 to achieve low-level water filling operation. At the same time, it is equipped with a low-resistance butterfly check valve 21 to minimize energy loss and save more electricity.

[0021] The laminar flow cold water tank 1 is connected to several first side spray pipe groups 6. A water collection tank 3 is provided below the first side spray pipe groups 6. A diversion plate 17 is installed inside the water collection tank 3. A cold clean water return pipe 7 is provided in the water collection tank 3 between the upper part of the diversion plate 17 and the laminar flow cold water tank 1. The water collection tank 3 is connected to the laminar flow hot water tank 10 in the lower part of the diversion plate 17.

[0022] The diverter plate 17 is controlled by hoisting equipment or telescopic equipment, so that the diverter plate 17 can swing. When the strip is cooling, the diverter plate 17 tilts downward, and the first side spray pipe group 6 sprays low temperature clean water (cold clean water) onto the strip. After the cold clean water cools the strip, it becomes high temperature dirty water (hot dirty water).

[0023] When there is no strip cooling, the diverter plate 17 tilts upward to guide the cold clean water to the cold clean return water pipe 7.

[0024] In this embodiment, as Figure 1 As shown, the laminar flow hot water tank 10 is connected to a hot dirty water return tank 9. The hot dirty water return tank 9 is connected to the water collection tank 3 through a hot dirty water return pipe 8. The hot dirty water return tank 9 temporarily stores hot dirty water and sends the hot dirty water to the laminar flow hot water tank 10 by overflow. Some impurities can settle to the bottom of the hot dirty water return tank 9. The hot dirty water return tank 9 is equipped with a drain pipe to discharge sediment.

[0025] In this embodiment, as Figure 1As shown, a standby pump 11 is installed between the laminar flow hot water tank 10 and the double suction pump 13. The standby pump 11 is equipped with a first valve 18. When the standby pump 11 is not in use, the first valve 18 is closed. When the double suction pump 13 needs to be maintained, the first valve 18 is opened and the standby pump 11 is started without stopping the cooling process of the strip steel.

[0026] In this embodiment, as Figure 1 As shown, a spare pipe 12 is installed between the laminar flow hot water tank 10 and the cooling tower 16, and the spare pipe 12 is equipped with a second valve 19. The pipe corresponding to the double suction pump 13 and the pipe corresponding to the spare pump 11 need to be inspected. The spare pipe 12 can be used in emergency situations in conjunction with an additional emergency pump.

[0027] In this embodiment, the plurality of cooling towers 16 are connected to a main discharge pipe 14, which is connected to a laminar flow cold water pool 1 via a branch pipe 15. After the cooling towers 16 lower the water temperature, the water returns to the laminar flow cold water pool 1 for reuse, thereby realizing the recycling of water.

[0028] In this embodiment, an auxiliary pool 4 is provided on the side of the water collection pool 3. The laminar flow cold water pool 1 is connected to a second side spray pipe group 20, and the second side spray pipe group 20 is matched with the auxiliary pool 4. The auxiliary pool 4 is connected to the cooling tower 16 through a suction pump 2 and an auxiliary pipe 5. The strip steel that has passed through the auxiliary pool 4 has been cooled by the first side spray pipe group 6. The temperature is low and there are few impurities. Therefore, the water in the auxiliary pool 4 is sent to the cooling tower 16 for cooling and reuse through the suction pump 2. The pipeline layout is more optimized.

[0029] Specifically, during use, when the strip steel passes over the water collection tank 3, the first side spray pipe group 6 draws cold clean water from the laminar flow cold water tank 1 and sprays it onto the strip steel. The cold clean water leaves the strip steel and becomes hot dirty water. The diverter plate 17 tilts downward to ensure that the hot dirty water flows to the bottom of the water collection tank 3. The hot dirty water enters the hot dirty water return tank 9 through the hot dirty water return pipe 8. Some impurities settle to the lower part of the hot dirty water return tank 9. After the hot dirty water return tank 9 is filled with water, the hot dirty water flows to the laminar flow hot water tank 10. The double suction pump 13 draws the hot dirty water from the laminar flow hot water tank 10 and sends it to the cooling tower 16. Before entering the cooling tower 16, the hot dirty water is filtered by multiple activated carbon filters, magnetic filters, and filter screens to remove impurities and become hot clean water. The hot clean water is sent to the cooling tower 16 for cooling and becomes cold clean water. It then returns to the laminar flow cold water tank 1 through the main discharge pipe 14 and the branch pipe 15.

[0030] When the strip steel passes over the water collection tank 3, the diversion plate 17 tilts upwards, and the cold clean water sprayed from the first side spray pipe group 6 flows into the cold clean return water pipe 7 along the diversion plate 17, instead of entering the hot dirty return water tank 9. After reducing the amount of water in the hot dirty return water tank 9, the temperature and turbidity of the hot dirty water in the laminar flow hot water tank 10 are greatly increased. This will significantly improve the efficiency of filtration and cooling treatment, providing a better solution for strip steel cooling.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An optimized energy-saving system for laminar flow cooling of steel strip, comprising a laminar flow cold water tank (1) and a laminar flow hot water tank (10), characterized in that: A double-suction pump (13) is installed on the lower side of the laminar flow hot water tank (10). The outlet of the double-suction pump (13) is connected to several cooling towers (16) through a micro-resistance butterfly check valve (21). The cooling towers (16) are connected to the laminar flow cold water tank (1). The laminar flow cold water tank (1) is connected to several first side spray pipe groups (6). A water collection tank (3) is provided below the first side spray pipe groups (6). A diversion plate (17) is installed inside the water collection tank (3). A cold clean water return pipe (7) is provided in the water collection tank (3) between the upper part of the diversion plate (17) and the laminar flow cold water tank (1). The water collection tank (3) is connected to the laminar flow hot water tank (10) between the lower part of the diversion plate (17). The laminar flow hot water tank (10) is connected to a hot dirty water return tank (9), and the hot dirty water return tank (9) is connected to the water collection tank (3) through a hot dirty water return pipe (8); The water collection tank (3) is provided with an auxiliary tank (4) on its side. The laminar flow cold water tank (1) is connected to a second side spray pipe group (20), and the second side spray pipe group (20) is matched with the auxiliary tank (4). The auxiliary pool (4) is connected to the cooling tower (16) via a suction pump (2) and an auxiliary pipe (5); A standby pump (11) is installed between the laminar flow hot water tank (10) and the double suction pump (13), and the standby pump (11) is equipped with a first valve (18). A spare pipe (12) is installed between the laminar flow hot water tank (10) and the cooling tower (16), and the spare pipe (12) is equipped with a second valve (19).

2. The optimized energy-saving system for laminar flow cooling of strip steel according to claim 1, characterized in that: The plurality of cooling towers (16) are connected to a main discharge pipe (14), which is connected to a laminar flow cold water pool (1) via a branch pipe (15).

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