Rolling mill cooling bed combined heat recovery system

Abstract

The utility model relates to a cold bed waste heat recovery technical field especially relates to a kind of steel rolling cold bed composite heat recovery system. Steel rolling cold bed composite heat recovery system includes heat exchange structure and drive structure. Heat exchange structure includes heat preservation cover, heat exchange component and air door component, heat preservation cover cover is located in the high temperature area of cold bed, heat preservation cover has the installation cavity towards high temperature area, heat exchange component is set in installation cavity, and heat exchange component inside flows through heat exchange medium;At least one opening is provided on heat preservation cover, an air door component is provided at one opening, and the air door component is used to partially cover or entirely cover opening;Drive structure includes support and driving part, support includes stand and rotating frame, heat exchange structure is rotationally arranged on stand by rotating frame, driving part drives rotating frame to rotate relative to stand, to drive heat exchange structure to be located at maintenance position or heat recovery position;Heat recovery position has multiple, heat exchange structure is located at different heat recovery position, and the spacing of heat exchange structure and cold bed in vertical direction is different.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology for cooling beds, and in particular to a composite heat recovery system for steel rolling cooling beds. Background Technology

[0002] As an energy-intensive industry, the steel industry accounts for 16.1% of the nation's total energy consumption and contributes approximately 12% of the country's total CO2 emissions. During production, about 40% of primary energy is released as waste heat and energy. Efficiently recovering this energy has become a core issue for the steel industry's green transformation. The cooling bed, a key cooling device in the steel rolling process, plays a crucial role in naturally cooling high-temperature rolled steel (800℃-950℃) to a lower temperature (200℃-350℃), a process accompanied by the release of a massive amount of sensible heat. Thermodynamic calculations show that the heat released from cooling 9 tons of steel can theoretically generate 1 ton of 0.5MPa steam, equivalent to generating 100kWh-110kWh of electricity. However, due to the low maturity of waste heat recovery technology and the difficulty of recovery, this portion of energy has long been underutilized, causing serious economic losses and environmental burdens.

[0003] Therefore, there is an urgent need for a composite heat recovery system for steel rolling cooling beds to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a composite heat recovery system for steel rolling cooling beds, which can effectively recover waste heat from the cooling beds, improve economic and environmental benefits, and improve the production environment.

[0005] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0006] A composite heat recovery system for a steel rolling cooling bed is provided, comprising:

[0007] A heat exchange structure includes an insulation cover, a heat exchange component, and a damper assembly. The insulation cover is disposed over the high-temperature zone of the cooling bed and has a mounting cavity facing the high-temperature zone. The heat exchange component is disposed within the mounting cavity, and a heat exchange medium flows within the heat exchange component to remove radiant heat from the high-temperature zone. The insulation cover has at least one opening, and a damper assembly is disposed at each opening. The damper assembly is used to partially or completely cover the opening.

[0008] The driving structure includes a support and a driving component. The support includes a column and a rotating frame. The heat exchange structure is rotatably mounted on the column via the rotating frame. The driving component is used to drive the rotating frame to rotate relative to the column, so as to move the heat exchange structure to a maintenance position or a heat recovery position. There are multiple heat recovery positions, and the heat exchange structure is located in different heat recovery positions. The vertical distance between the heat exchange structure and the cooling bed is different.

[0009] Optionally, the damper assembly includes a damper cover plate, a damper drive motor, and a drive rod. The damper cover plate is slidably disposed at the opening. One end of the drive rod is connected to the damper cover plate, and the other end of the drive rod is connected to the output end of the damper drive motor. The damper drive motor is used to drive the drive rod to move the damper cover plate along the axial direction of the drive rod.

[0010] Optionally, the damper assembly further includes a damper baffle surrounding the edge of the opening. The damper baffle includes a first side baffle extending perpendicular to the moving direction of the damper cover and two second side baffles extending along the moving direction of the damper cover. The damper cover is slidably disposed between the two second side baffles. The damper baffle completely covers the opening and abuts against the first side baffle.

[0011] Optionally, the damper assembly further includes a positioning rod disposed on the damper cover plate, and a scale line is provided on the second side baffle plate. The positioning rod and the scale line are used to identify the moving position of the damper cover plate.

[0012] Optionally, the driving component includes a motor and a pull rod. The motor drives the pull rod to move along its own axial direction. The pull rod is connected to a first end of the rotating frame, a second end of the rotating frame is rotatably connected to the heat insulation cover, and the middle section of the rotating frame is rotatably connected to the column.

[0013] Optionally, the heat exchange structure is located at the heat recovery position, the rotating frame forms a first angle α with the horizontal plane, 0°≤a≤20°, and the vertical distance between the heat exchange structure and the cooling bed is L1, 50mm≤L2≤200mm;

[0014] And / or, the heat exchange structure is located at the maintenance position, and the rotating frame forms a second angle b with the horizontal plane, 40°≤b≤50°.

[0015] Optionally, the heat exchange assembly includes heat exchange tubes, an inlet tube, an outlet tube, and heat exchange plates. Multiple heat exchange tubes are arranged in parallel, and the heat exchange plates connect adjacent heat exchange tubes. The first end of each heat exchange tube is connected to the inlet tube, and the second end of each heat exchange tube is connected to the outlet tube. The heat exchange medium flows through the heat exchange tubes.

[0016] Optionally, the inner surface of the heat exchange tube is provided with multiple turbulence protrusions.

[0017] Optionally, a selective absorption coating is provided on the outer surface of the heat exchange tube, the selective absorption coating being used to make the absorptivity of the heat exchange tube between 0.85 and 0.95, and the reflectivity of the heat exchange tube between 0.05 and 0.15.

[0018] Optionally, the roughness Ra of the cavity wall of the mounting cavity is less than or equal to 0.01 μm.

[0019] The beneficial effects of this utility model are as follows:

[0020] This utility model proposes a composite heat recovery system for a steel rolling cooling bed, comprising a heat exchange structure and a drive structure. The drive structure includes a support frame and a drive component. The support frame includes a column and a rotating frame. The column is positioned on one side of the cooling bed, and the heat exchange structure is rotatably mounted on the column via the rotating frame, positioning it above the cooling bed and covering its high-temperature zone, thereby recovering radiant heat from the high-temperature zone. The drive component enables the rotating frame to rotate relative to the column, allowing the heat exchange structure to be in either a maintenance position or a heat recovery position. In the maintenance position, sufficient space is provided for maintenance of both the heat exchange structure and the cooling bed. In the heat recovery position, the heat exchange structure is positioned close to the rolled steel on the cooling bed to receive radiant heat from the rolled steel, improving heat recovery efficiency. Secondly, there are multiple heat recovery locations. The vertical distance between the heat exchange structure and the cooling bed varies depending on the location of the heat exchange structure, meeting the heat exchange requirements of different steels, ensuring a slow cooling effect, and preventing excessively rapid cooling due to the heat exchange structure being too close to the cooling bed, which could cause stress cracking in the rolled steel. The heat exchange structure includes an insulation cover, heat exchange components, and damper components. The insulation cover is installed in the high-temperature zone of the cooling bed and has an installation cavity facing the high-temperature zone. The heat exchange components are installed in the installation cavity, and a heat exchange medium flows within the heat exchange components. This heat exchange medium can remove the heat radiated by the rolled steel in the high-temperature zone, and the heat absorbed by the heat exchange medium can be reused to achieve waste heat recovery from the rolled steel. The insulation cover has at least one opening, and a damper component is installed at each opening. The damper component is used to partially or completely cover the opening. Unlike the aforementioned recovery of radiated heat from the rolled steel using heat exchange components, the design of the opening on the insulation cover allows for heat recovery through natural convection. When the opening is opened, the local high-temperature air in the high-temperature zone will form natural convection with the low-temperature air above the insulation cover due to the temperature difference. This not only enhances the heat exchange effect but also prevents excessively rapid cooling.

[0021] This steel rolling mill cooling bed composite heat recovery system adds natural convection heat transfer to radiative heat exchange. It not only effectively recovers waste heat from the cooling bed but also allows for adjustment of heat exchange components to different heat recovery positions and damper components to different opening degrees based on the type of steel being rolled. This ensures both heat recovery efficiency and the quality of the cooled steel, improving both economic and environmental benefits. The composite heat recovery system effectively recovers waste heat from the cooling bed, significantly reducing the temperature in the steel rolling production workshop, minimizing thermal deformation of cooling bed equipment, steel transport equipment, and supporting components, extending equipment lifespan, and significantly improving the production environment. Attached Figure Description

[0022] Figure 1 This utility model provides a composite heat recovery system for a steel rolling cooling bed (the heat exchange structure is located at the heat recovery position).

[0023] Figure 2This utility model provides a composite heat recovery system for a steel rolling cooling bed (the heat exchange structure is located in a maintenance position).

[0024] Figure 3 This is a schematic diagram showing the installation position of the damper assembly on the insulation cover according to an embodiment of the present invention;

[0025] Figure 4 This is a cross-sectional view of the damper assembly provided in an embodiment of this utility model;

[0026] Figure 5 This is a first-view structural schematic diagram of the damper assembly provided in an embodiment of the present invention;

[0027] Figure 6 This is a second-view structural schematic diagram of the damper assembly provided in an embodiment of the present invention;

[0028] Figure 7 This is a partial structural schematic diagram of the heat exchange component provided in an embodiment of this utility model;

[0029] Figure 8 yes Figure 7 Enlarged view of point A in the middle;

[0030] Figure 9 This is a partial structural schematic diagram of the heat exchange tube provided in an embodiment of this utility model;

[0031] Figure 10 This is a flowchart illustrating the heat exchange component control method provided in this embodiment of the present invention.

[0032] Figure 11 This is a flowchart illustrating the damper assembly control method provided in this embodiment of the utility model.

[0033] In the picture:

[0034] 1. Heat exchange structure; 11. Insulation cover; 12. Heat exchange assembly; 121. Heat exchange tube; 1211. Turbulence protrusion; 122. Inlet pipe; 1220. Inlet; 123. Outlet pipe; 1230. Outlet; 124. Heat exchange fins; 125. Support component; 13. Damper assembly; 131. Damper baffle; 1311. First side baffle; 1312. Second side baffle; 1313. Scale line; 132. Damper cover plate; 133. Drive rod; 134. Connecting sleeve; 135. Damper drive motor; 136. Mounting base; 137. Positioning rod;

[0035] 2. Drive structure; 21. Bracket; 211. Column; 212. Rotating frame; 22. Drive component; 221. Motor; 222. Tie rod;

[0036] 100. Cooling bed; 200. Steel rolling. Detailed Implementation

[0037] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] like Figure 1 and Figure 2As shown, this embodiment provides a composite heat recovery system for a steel rolling cooling bed, including a heat exchange structure 1 and a drive structure 2. The drive structure 2 includes a support 21 and a drive component 22. The support 21 includes a column 211 and a rotating frame 212. The column 211 is disposed on one side of the cooling bed 100. The heat exchange structure 1 is rotatably mounted on the column 211 via the rotating frame 212, so that the heat exchange structure 1 is positioned above the cooling bed 100 and can cover the high-temperature zone of the cooling bed 100, thereby recovering the radiant heat from the high-temperature zone. The drive component 22 can drive the rotating frame 212 to rotate relative to the column 211, thereby placing the heat exchange structure 1 in either a maintenance position or a heat recovery position. When the heat exchange structure 1 is in the maintenance position, sufficient maintenance space is ensured for personnel to perform maintenance on the heat exchange structure 1 and the cooling bed 100. When the heat exchange structure 1 is in the heat recovery position, it is ensured to be close to the rolled steel 200 on the cooling bed 100 to receive radiant heat from the rolled steel 200, improving heat recovery efficiency. Secondly, there are multiple heat recovery locations. When the heat exchange structure 1 is located in different heat recovery locations, the vertical distance between the heat exchange structure 1 and the cooling bed 100 is different, which can meet the heat exchange requirements of different steels, ensure a slow cooling effect, and avoid the heat exchange structure 1 being too close to the cooling bed 100, which would lead to excessively fast cooling and stress cracking of the rolled steel 200. The heat exchange structure 1 includes an insulation cover 11, a heat exchange component 12, and a damper component 13. The insulation cover 11 is installed over the high-temperature zone of the cooling bed 100 and has an installation cavity facing the high-temperature zone. The heat exchange component 12 is installed in the installation cavity, and a heat exchange medium circulates within the heat exchange component 12. The heat exchange medium can remove the heat radiated by the rolled steel 200 in the high-temperature zone, and the heat absorbed by the heat exchange medium can be reused to achieve waste heat recovery of the rolled steel 200. The insulation cover 11 is provided with at least one opening, and a damper component 13 is provided at each opening. The damper component 13 is used to partially or completely cover the opening. Unlike the aforementioned method of recovering radiant heat from the rolled steel 200 using heat exchange component 12, the design of the opening on the insulation cover 11 allows for heat recovery through natural convection. When the opening is open, the local high-temperature air in the high-temperature zone will form natural convection with the low-temperature air above the insulation cover 11 due to the temperature difference. This not only enhances the heat exchange effect but also prevents excessively rapid cooling.

[0043] This steel rolling mill cooling bed composite heat recovery system adds natural convection heat transfer to radiative heat transfer. It not only effectively recovers waste heat from the cooling bed 100, but also adjusts the heat exchange components 12 to different heat recovery positions and the damper components 13 to different damper openings according to the different steel materials on the cooling bed 100. This ensures heat recovery efficiency while maintaining the quality of the cooled rolled steel 200, improving both economic and environmental benefits. The steel rolling mill cooling bed composite heat recovery system effectively recovers waste heat from the cooling bed 100, which can effectively reduce the temperature in the steel rolling mill 200 production workshop, reduce thermal deformation of the cooling bed equipment, steel transport equipment, and supporting components, extend equipment lifespan, and significantly improve the production environment.

[0044] Optionally, such as Figures 3 to 6 As shown, the damper assembly 13 includes a damper cover plate 132, a damper drive motor 135, and a drive rod 133. The damper cover plate 132 is slidably disposed at the opening. One end of the drive rod 133 is connected to the damper cover plate 132, and the other end of the drive rod 133 is connected to the output end of the damper drive motor 135. The damper drive motor 135 moves the drive rod 133 along its own axial direction, thereby driving the damper cover plate 132 to move along the axial direction of the drive rod 133, thus changing the coverage rate of the damper cover plate 132 at the opening, which is also the damper opening degree. The damper opening degree ranges from 0 to 100%. Depending on the material of the rolled steel 200 on the cooling bed 100, the damper opening degree is different, that is, the moving distance of the drive rod 133 is different, so that the damper cover plate 132 moves to different positions of the opening.

[0045] In this embodiment, the output end of the damper drive motor 135 is used to output a force for circumferential rotation around the drive rod 133. The damper assembly 13 also includes a connecting sleeve 134, which is sleeved on the outer periphery of the drive rod 133 and connected to the output end of the damper drive motor 135. When the damper drive motor 135 is turned on, the connecting sleeve 134 rotates. The inner wall of the connecting sleeve 134 is provided with an internal thread, and the outer periphery of the drive rod 133 is provided with an external thread. Because the drive rod 133 is connected to the slidably disposed damper cover plate 132, the drive rod 133 is limited to moving only along its own axial direction, thereby driving the damper cover plate 132 to move. In other embodiments, the output end of the damper drive motor 135 can also be configured to output a force for axial movement along the drive rod 133, so that the damper drive motor 135 can directly drive the drive rod 133 to move along its own axial direction, thereby driving the damper cover plate 132 to move.

[0046] Optionally, such as Figure 6 As shown, the damper assembly 13 also includes a damper baffle 131, which surrounds the edge of the opening. The damper baffle 131 includes a first side baffle 1311 and two second side baffles 1312. The first side baffle 1311 extends perpendicular to the moving direction of the damper cover 132, and the two second side baffles 1312 extend along the moving direction of the damper cover 132. The damper cover 132 is slidably disposed between the two second side baffles 1312. When the damper cover 132 completely covers the opening, the damper cover 132 abuts against the first side baffle 1311. The damper baffle 131 is provided to prevent the damper cover 132 from detaching from the opening when it moves. When the damper cover 132 moves to the damper opening degree of 0, the damper cover 132 abuts against the first side baffle 1311. When the damper cover 132 moves to the damper opening degree of 100%, the damper cover 132 abuts against the damper drive motor 135.

[0047] Optionally, such as Figure 6As shown, the damper assembly 13 also includes a positioning rod 137, which is mounted on the damper cover plate 132. A scale line 1313 is provided on the second side baffle 1312. When the damper cover plate 132 moves, the positioning rod 137 moves accordingly. The position of the damper cover plate 132 is indicated when the positioning rod 137 moves to the corresponding scale line 1313. The scale line 1313 is set with percentages such as 20%, 40%, 60%, 80%, and 100%. When the positioning rod 137 moves to 20%, it indicates that the damper opening of the damper assembly 13 is 20%. When the positioning rod 137 abuts against the first side baffle 1311, it indicates that the damper opening of the damper assembly 13 is 0%.

[0048] Optionally, such as Figure 4 As shown, the damper assembly 13 also includes a mounting base 136, which is disposed on the insulation cover 11, and the damper drive motor 135 is fixed on the mounting base 136.

[0049] Furthermore, such as Figure 1 As shown, the driving component 22 of the driving structure 2 includes a motor 221 and a pull rod 222. The motor 221 drives the pull rod 222 to move along its own axial direction. The pull rod 222 is connected to the first end of the rotating frame 212, the second end of the rotating frame 212 is rotatably connected to the heat insulation cover 11, and the middle section of the rotating frame 212 is rotatably connected to the column 211. In this embodiment, the output end of the motor 221 is used to output a force for circumferential rotation around the pull rod 222. The driving component 22 also includes a rotating nut, which is sleeved on the outer circumference of the pull rod 222 and connected to the output end of the motor 221. When the motor 221 is turned on, the rotating nut rotates. The inner wall of the rotating nut is provided with an internal thread, and the outer circumference of the pull rod 222 is provided with an external thread. Because the pull rod 222 is connected to the first end of the rotating frame 212, the pull rod 222 is limited to moving only along its own axial direction. When the pull rod 222 moves toward the end away from the rotating frame 212, the first end of the rotating frame 212 tilts downward, and the second end of the rotating frame 212 tilts upward, thereby driving the heat exchange structure 1 away from the cooling bed 100. The insulation cover 11 is rotatably connected to the second end of the rotating frame 212. When the tilt angle of the rotating frame 212 is small, the heat exchange component 12 can still remain parallel to the cooling bed 100 under the action of gravity. However, as the tilt angle of the rotating frame 212 continues to increase, due to the limitation of the rotating frame 212 on the heat exchange component 12, the heat exchange component 12 will also tilt relative to the cooling bed 100 to facilitate subsequent maintenance work.

[0050] Optionally, the heat exchange structure 1 is located at the heat recovery position, and the rotating frame 212 forms a first angle α with the cooling bed 100, where 0°≤a≤20°. The vertical distance between the heat exchange structure 1 and the cooling bed 100 is L1, where 50mm≤L1≤200mm. In specific implementation, the rotating frame 212 needs to rotate to adjust the distance between the heat exchange structure 1 and the cooling bed 100. As the angle between the rotating frame 212 and the horizontal direction increases, the rotating frame 212 drives the heat exchange structure 1 to rise. To ensure the efficiency of the heat exchange structure 1 in recovering the waste heat of the rolled steel 200 on the cooling bed 100, the vertical distance between the heat exchange structure 1 and the cooling bed 100 needs to be within a suitable range. Therefore, the first angle α between the rotating frame 212 and the horizontal plane is less than or equal to 20°. In addition, since the rotating frame 212 and the heat insulation cover 11 are also rotatably connected, within the above-mentioned angle range, the heat insulation cover 11 and the heat exchange component 12 inside it are affected by gravity, which makes the heat exchange component 12 parallel to the plane of the cooling bed 100. That is, the distance between the heat exchange component 12 and the rolling mill 200 on the cooling bed 100 is consistent, so as to ensure the consistency of radiant heat recovery from the rolling mill 200 at all points.

[0051] In practical implementation, when the steel rolling cooling bed composite heat recovery system enters the operating mode, the rotation angle needs to be selected according to the different steel materials on the cooling bed 100 to drive the heat exchange structure 1 to different heat recovery positions. Therefore, the rotation angle of the rotating frame 212 can be preset according to different steel materials. For example, for carbon steel, the rotating frame 212 is set at an angle of 0° to the cooling bed 100; for 304 stainless steel, the rotating frame 212 is set at an angle of 5° to the cooling bed 100; and for 316 stainless steel, the rotating frame 212 is set at an angle of 10° to the cooling bed 100, etc.

[0052] In practice, the steel rolling cooling bed composite heat recovery system enters the shutdown mode, the heat exchange structure 1 is in the maintenance position, and the rotating frame 212 forms a second angle b with the horizontal plane, 40°≤b≤50°. To adjust the distance between the heat exchange component 12 and the cooling bed 100, the rotating frame 212 needs to rotate. As the angle between the rotating frame 212 and the horizontal direction increases, the rotating frame 212 drives the heat exchange structure 1 to rise, ensuring sufficient maintenance space for personnel to easily inspect and maintain the heat exchange structure 1 and the cooling bed 100.

[0053] Furthermore, such as Figure 7 and Figure 8As shown, to improve the heat recovery efficiency of the heat exchange structure 1, the heat exchange component 12 of the heat exchange structure 1 provided in this embodiment includes heat exchange tubes 121, inlet pipes 122, outlet pipes 123, and heat exchange plates 124. Multiple heat exchange tubes 121 are arranged in parallel, and heat exchange plates 124 connect adjacent heat exchange tubes 121. The first end of each heat exchange tube 121 is connected to the inlet pipe 122, and the second end of each heat exchange tube 121 is connected to the outlet pipe 123. A heat exchange medium flows through the heat exchange tubes 121. In specific implementation, the heat exchange medium first flows into the inlet pipe 122 through the inlet 1220, then flows through the inlet pipe 122 to the multiple heat exchange tubes 121, and finally flows along the extension direction of the heat exchange tubes 121 to the outlet pipe 123, and finally flows out of the heat exchange component 12 from the outlet 1230 of the outlet pipe 123.

[0054] In this embodiment, perpendicular to the extension direction of the heat exchange tube 121, the distance between two adjacent heat exchange tubes 121 is L2, where 10mm≤L2≤50mm. Two adjacent heat exchange tubes 121 are connected by heat exchange plates 124 to form a membrane wall structure. This membrane wall structure effectively increases the radiative heat exchange area, improves the heat recovery rate, and reduces the weight of the heat exchange module.

[0055] In this embodiment, the heat exchange assembly 12 further includes a support member 125, and the heat exchange tube 121 is connected to the heat insulation cover 11 through the support member 125.

[0056] Optionally, such as Figure 9 As shown, the inner surface of the heat exchange tube 121 is provided with multiple turbulence protrusions 1211. The turbulence protrusions 1211 can generate continuous axial vortices in the fluid inside the heat exchange tube 121, thereby breaking the boundary layer thermal resistance of the wall and achieving a stable and enhanced heat transfer effect. In specific implementations, the heat exchange tube 121 can be a corrugated tube or a threaded tube. In this embodiment, the heat exchange tube 121 is a corrugated tube with a base tube outer diameter of 16mm-38mm, a base tube wall thickness of 1mm-3mm, a groove depth of 0.5mm-1.5mm, and a thread pitch of 10mm-20mm.

[0057] Optionally, a selective absorption coating is provided on the outer surface of the heat exchange tube 121. This selective absorption coating is used to ensure that the absorptivity of the heat exchange tube 121 is between 0.85 and 0.95, and the reflectivity is between 0.05 and 0.15. The selective absorption coating enhances the absorption of radiant heat by the heat exchange tube 121, thereby improving its heat exchange efficiency. Specifically, the selective absorption coating can be a black nickel plating, a ceramic-metal composite plating, a sputtered plating, a high-performance black paint layer, etc. These coatings have high absorptivity and low reflectivity, effectively improving the absorption efficiency of the heat exchange tube 121 for the radiant heat from the rolled steel 200.

[0058] Furthermore, to improve the heat recovery efficiency of the heat exchange structure 1, the heat exchange component 12 in this embodiment is disposed inside the mounting cavity to reduce heat loss caused by heat exchange between the heat exchange component 12 and the external room temperature environment. At the same time, the cavity wall of the mounting cavity is mirror-finished to reduce roughness, and the roughness Ra of the cavity wall is less than or equal to 0.01 μm. The smooth cavity wall of the mounting cavity can improve reflectivity, making it less likely for heat to be lost from the insulation cover 11. The radiative heat absorption of the heat exchange structure 1 is increased, and the ambient temperature outside the insulation cover 11 decreases, thus improving the working environment of the cooling bed 100.

[0059] This embodiment also provides a control method applied to the above-mentioned steel rolling cooling bed composite heat recovery system. The control method includes a heat exchange component control method and a damper component control method.

[0060] like Figure 10 As shown, the heat exchange component control method includes steps such as input mode, input signal, processing result, and execution action.

[0061] Input mode: If the input is running mode, the input signal flow will be initiated; if the input is parking mode, the action execution flow will be initiated.

[0062] Input signal: If the input steel material is carbon steel, the rotation angle of the rotating frame 212 is set to 0°; if the input steel material is special stainless steel, the rotation angle of the rotating frame 212 is set to 5°-20°.

[0063] Processing result: Input the rotation angle of the rotating frame 212 corresponding to the selected steel. If the input angle matches the selected steel, the execution action flow will be entered. If the input angle does not match the selected steel, the input signal flow will be returned.

[0064] Action performed: If the input mode is running mode, the system adjusts the rotation angle of the rotating frame 212 to 0°-20° according to the input signal and processing result; if the input mode is parking mode, the system adjusts the rotation angle of the rotating frame 212 to 45°.

[0065] Specifically, when inputting a signal, if the input steel material is carbon steel, the system sets the rotation angle of the rotating frame 212 to 0°; if the input steel material is 304 stainless steel, the system sets the rotation angle of the rotating frame 212 to 5°; if the input steel material is 316 stainless steel, the system sets the rotation angle of the rotating frame 212 to 10°.

[0066] like Figure 11 As shown, the damper assembly control method includes the following steps:

[0067] First, when the damper assembly 13 enters the automatic adjustment mode, the steel diameter needs to be selected according to the actual size of the rolled steel 200 on the cooling bed 100. The damper drive motor 135 drives the damper cover plate 132 to move a preset distance according to the steel diameter so that the damper assembly 13 maintains the preset damper opening.

[0068] Secondly, monitor the steam temperature at the outlet 1230 of the outlet pipe 123 of the heat exchange component 12. If the steam temperature is within the preset temperature range, stop adjusting; if the steam temperature is higher than the preset temperature range, reduce the damper opening by 5%; if the steam temperature is lower than the preset temperature, increase the damper opening by 5% until the steam temperature at the outlet 1230 is within the preset temperature range.

[0069] In addition, the damper assembly control method can also select a manual adjustment mode, in which the damper opening can be determined according to the actual size of the rolling mill 200 on the cooling bed 100, and then the damper assembly 13 can be adjusted to the preset damper opening.

[0070] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A combined heat recovery system for a steel rolling and cooling bed, characterized in that, include: The heat exchange structure (1) includes an insulation cover (11), a heat exchange component (12), and a damper assembly (13). The insulation cover (11) is installed over the high-temperature zone of the cooling bed (100). The insulation cover (11) has an installation cavity facing the high-temperature zone. The heat exchange component (12) is disposed in the installation cavity. A heat exchange medium flows through the heat exchange component (12) and is used to remove the radiant heat from the high-temperature zone. At least one opening is provided on the insulation cover (11), and a damper assembly (13) is provided at each opening. The damper assembly (13) is used to partially or completely cover the opening. The drive structure (2) includes a bracket (21) and a drive component (22). The bracket (21) includes a column (211) and a rotating frame (212). The heat exchange structure (1) is rotatably mounted on the column (211) via the rotating frame (212). The drive component (22) is used to drive the rotating frame (212) to rotate relative to the column (211) so that the heat exchange structure (1) is located in a maintenance position or a heat recovery position. There are multiple heat recovery positions. The heat exchange structure (1) is located in different heat recovery positions. The vertical distance between the heat exchange structure (1) and the cooling bed (100) is different.

2. The combined heat recovery system for a steel rolling transfer bed according to claim 1, wherein, The damper assembly (13) includes a damper cover plate (132), a damper drive motor (135), and a drive rod (133). The damper cover plate (132) is slidably disposed at the opening. One end of the drive rod (133) is connected to the damper cover plate (132), and the other end of the drive rod (133) is connected to the output end of the damper drive motor (135). The damper drive motor (135) is used to drive the drive rod (133) to move the damper cover plate (132) along the axial direction of the drive rod (133).

3. The combined heat recovery system for a steel rolling transfer bed according to claim 2, wherein, The damper assembly (13) further includes a damper baffle (131) surrounding the edge of the opening. The damper baffle (131) includes a first side baffle (1311) extending perpendicular to the moving direction of the damper cover (132) and two second side baffles (1312) extending along the moving direction of the damper cover (132). The damper cover (132) is slidably disposed between the two second side baffles (1312). The damper baffle (131) completely covers the opening and abuts against the first side baffle (1311).

4. The combined heat recovery system for a steel rolling transfer bed according to claim 3, wherein The damper assembly (13) also includes a positioning rod (137), which is disposed on the damper cover plate (132). A scale line (1313) is provided on the second side baffle (1312). The positioning rod (137) and the scale line (1313) are used to identify the moving position of the damper cover plate (132).

5. The combined heat recovery system for a steel rolling transfer bed according to claim 1, wherein, The driving component (22) includes a motor (221) and a pull rod (222). The motor (221) is used to drive the pull rod (222) to move along its own axis. The pull rod (222) is connected to the first end of the rotating frame (212). The second end of the rotating frame (212) is rotatably connected to the heat insulation cover (11). The middle section of the rotating frame (212) is rotatably connected to the column (211).

6. The combined heat recovery system for a steel rolling transfer bed according to claim 5, wherein, The heat exchange structure (1) is located at the heat recovery position. The rotating frame (212) forms a first angle a with the horizontal plane, 0°≤a≤20°. The vertical distance between the heat exchange structure (1) and the cooling bed (100) is L1, 50mm≤L1≤200mm. And / or, the heat exchange structure (1) is located in the maintenance position, and the rotating frame (212) forms a second angle b with the horizontal plane, 40°≤b≤50°.

7. The combined heat recovery system for a steel rolling transfer bed according to claim 1, wherein The heat exchange assembly (12) includes heat exchange tubes (121), inlet pipe (122), outlet pipe (123), and heat exchange plates (124). There are multiple heat exchange tubes (121) arranged in parallel. The heat exchange plates (124) connect adjacent heat exchange tubes (121). The first end of each heat exchange tube (121) is connected to the inlet pipe (122), and the second end of each heat exchange tube (121) is connected to the outlet pipe (123). The heat exchange medium flows inside the heat exchange tubes (121).

8. The combined heat recovery system for a steel rolling transfer bed according to claim 7, wherein The inner surface of the heat exchange tube (121) is provided with multiple turbulence protrusions (1211).

9. The combined heat recovery system for a steel rolling transfer bed according to claim 7, wherein The outer surface of the heat exchange tube (121) is provided with a selective absorption coating, which is used to make the absorptivity of the heat exchange tube (121) between 0.85 and 0.95 and the reflectivity of the heat exchange tube (121) between 0.05 and 0.

15.

10. The combined heat recovery system for a steel rolling transfer bed according to claim 1, wherein, The roughness Ra of the cavity wall of the mounting cavity is less than or equal to 0.01 μm.

Images