A cooling bed heat exchanger, system, and waste heat recovery method

Abstract

This invention belongs to the field of waste heat recovery technology for cold beds, and discloses a cold bed heat exchanger, including a sliding platform, a heat exchanger, a carriage, and a flexible hose. The sliding platform is supported above the cold bed; the heat exchanger can reciprocate along a preset direction on the sliding platform; the carriage is supported above the sliding platform; the flexible hose is connected to the heat exchange tubes of the heat exchanger, and the flexible hose can follow the heat exchanger in reciprocating along the preset direction on the carriage. This invention enables the reciprocating movement of the heat exchanger, thereby promptly clearing the upper space of the steel spill area in the event of operational or equipment failures such as steel spillage, allowing personnel to handle emergencies more quickly. This invention also discloses a cold bed heat exchange system that uses independent equipment to expand the heat exchange surface, further improving the absorption of heat emitted by the cold bed. This invention also discloses a waste heat recovery method that can utilize the waste heat from the cold bed for power generation.

Description

Technical Field

[0001] This invention belongs to the field of waste heat recovery technology for cold beds, and particularly relates to a cold bed heat exchange equipment, system and waste heat recovery method. Background Technology

[0002] Industrial waste heat recovery is an important part of my country's energy conservation and emission reduction efforts. Hot-rolled bars and sections, after the rolling process, need to be sent to a cooling bed for natural cooling, reducing the temperature from 800-950℃ to around 100℃ when they leave the cooling bed. This process results in a significant loss of heat, leading to energy waste and thermal pollution of the workshop environment, thus worsening the working conditions.

[0003] Currently, as the rolled workpiece moves forward on the cooling bed and gradually cools down, the temperature varies in different sections of the cooling bed, causing the heat source to be unstable and affecting the heat recovery efficiency of the heat exchange equipment. At the same time, the cooling bed equipment requires periodic maintenance and replacement of related equipment, and the frequent occurrence of operational failures such as "flying steel" during production also increases the difficulty of efficiently recovering waste heat from the cooling bed. Summary of the Invention

[0004] To address at least one of the aforementioned technical problems, this invention discloses a cooling bed heat exchanger capable of reciprocating motion, thereby promptly clearing the upper space of the steel spill area in the event of operational or equipment malfunctions such as steel spillage, allowing for faster emergency response by personnel. This invention also discloses a cooling bed heat exchange system that utilizes independent equipment to expand the heat exchange surface, further enhancing the absorption of heat dissipated from the cooling bed. Furthermore, this invention discloses a waste heat recovery method capable of generating electricity using waste heat from the cooling bed. The specific technical solutions of this invention are as follows:

[0005] A cooling bed heat exchange device, comprising:

[0006] A sliding platform, which is supported above the cooling bed;

[0007] A heat exchanger that can reciprocate along a preset direction on a sliding platform;

[0008] A carriage, the carriage being supported above a sliding platform; and

[0009] The hose is connected to the heat exchange tubes of the heat exchanger, and the hose can reciprocate along a preset direction on the slide along the heat exchanger.

[0010] The heat exchanger has a high-frequency resistance welded finned tube, which is filled with softened water. The softened water flows into the heat exchanger through a flexible hose. When a steel fly occurs, the heat exchanger needs to be moved quickly and smoothly. At this time, the flexible hose needs to follow the movement of the heat exchanger. Otherwise, the heat exchanger will leak water or be unable to move due to the braking effect of the flexible hose.

[0011] Preferably, the heat exchanger reciprocates along a preset direction on the sliding platform via a drive mechanism; at least two first rollers are provided on either side of the heat exchanger, and any one of the first rollers is connected to the sliding platform;

[0012] The drive mechanism includes:

[0013] The first moving wheel is fixedly set; and

[0014] A fixed second driving wheel is connected to the first driving wheel by a chain;

[0015] Wherein, one end of the chain is connected to the end of the heat exchanger near the first moving wheel, and the other end of the chain is connected to the end of the heat exchanger near the second moving wheel; the first moving wheel and / or the second moving wheel have a power device for driving their rotation.

[0016] The first and second moving wheels can provide the heat exchanger with moving power in different directions, thereby enabling the heat exchanger to move by being driven by the chain, thus meeting the requirement of rapid displacement of the heat exchanger.

[0017] Preferably, each hose has several connecting segments; any one connecting segment is connected to the carriage via a trolley so that it reciprocates along a preset direction on the carriage following the heat exchanger.

[0018] When the heat exchanger moves, it pulls the hose to move. At this time, the trolley moves on the carriage so that the trolley carries the corresponding heat exchanger connection section on the carriage, thereby preventing the heat exchanger from leaking or becoming unable to move.

[0019] Preferably, the carriage is provided with a C-shaped groove, and the trolley is slidably connected to the carriage within the C-shaped groove.

[0020] The C-shaped chute can provide movement limits for the trolley, thereby enabling the trolley to travel stably on the carriage in a preset direction.

[0021] Preferably, the distance between the heat exchange equipment and the cooling bed is 900-1100 mm.

[0022] The aforementioned distance ensures the normal operation of the cooling bed and facilitates responses to emergencies while maximizing waste heat recovery efficiency. This enables staff to quickly respond to various special situations, emergencies, and accidents, thereby enhancing the reliability and stability of the heat exchange equipment. Furthermore, based on the aforementioned reliability requirements, it also meets the purpose of energy tiered utilization.

[0023] Preferred options also include:

[0024] A flow guide shroud is installed between the cooling bed and the heat exchanger to concentrate the hot air released by the steel on the cooling bed and guide it to the heat exchanger.

[0025] The flow guide provides a channel for concentrated flow of hot air, thereby guiding the hot air out and allowing the heat exchanger to come into more full contact with the hot air, thus better vaporizing the softened water in the heat exchange tubes.

[0026] A cooling bed heat exchange system, comprising:

[0027] Several types of cold bed heat exchange equipment as described above;

[0028] Several cooling bed heat exchangers are set up side by side.

[0029] Multiple heat exchangers are arranged side-by-side in the high-temperature zone of the cooling bed, increasing the total heat exchange area and enabling the recovery of more waste heat at once. The heat exchange surfaces of the heat exchangers are arranged in the high-temperature zone, which can improve the recovery efficiency of the entire waste heat recovery system and reduce investment costs.

[0030] Preferred options also include:

[0031] Water softening equipment;

[0032] A deaerator, which is connected to the water softening equipment and the heat exchange equipment;

[0033] Steam pipeline network, wherein the steam pipeline network is connected to the cooling bed heat exchange equipment; and

[0034] Steam drum, which is connected to a deaerator, heat exchange equipment and steam pipeline network;

[0035] The softened water provided by the softening water equipment is deoxygenated by the deaerator and then enters the heat exchange surface of the heat exchanger to absorb the residual heat emitted by the cooling bed bars, forming a saturated steam-water mixture under a specific pressure. The saturated steam-water mixture then enters the steam drum for steam-water separation. After that, the liquid water enters the heat exchanger to form a water circulation. After steam separation, it enters the steam pipeline network.

[0036] The water entering the heat exchange tubes through the hose is deoxygenated softened water. The heat exchanger vaporizes the softened water to form saturated steam, which is then output through the steam network for power generation. The deoxygenated softened water can prevent corrosion of the tube walls and avoid scaling, thereby extending the service life of the heat exchange equipment.

[0037] A waste heat recovery method is applied to the cold bed heat exchange system described above; the heat exchange method includes:

[0038] Softened water is output from the water softening equipment, deoxygenated by the deaerator, and then enters the steam drum. It then enters the heat exchanger to quickly absorb radiant heat and form a steam-water mixture.

[0039] The steam-water mixture is separated into liquid water and saturated steam by a steam drum.

[0040] Saturated steam enters the steam pipeline network, which then outputs the saturated steam to the power generation equipment for power generation.

[0041] Liquid water and newly added softened water flow into the steam drum, and the above steps are repeated.

[0042] Preferably, a water supply pump is provided between the steam drum and the deaerator;

[0043] The steam drum is controlled by a three-impulse PID controller to regulate the frequency of the water supply pump.

[0044] Compared with existing technologies, this invention can achieve rapid absorption of radiant heat, improve heat exchange efficiency, and enable the softened water in the heat exchange tube to form a steam-water mixture in a short time, and form high-temperature saturated steam after circulation. This allows for efficient power generation using saturated steam, achieving energy conservation and emission reduction. This invention can be applied to different working conditions, greatly reducing on-site workload and facilitating inspection and maintenance. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the heat exchange equipment in an embodiment of the present invention;

[0046] Figure 2 for Figure 1 Enlarged view of point A;

[0047] Figure 3 for Figure 1 Enlarged view of point B;

[0048] Figure 4 for Figure 1 Enlarged view of point C;

[0049] Figure 5 for Figure 1 The left view;

[0050] Figure 6 for Figure 5 An enlarged view of point D, showing a schematic diagram with a second roller;

[0051] Figure 7 for Figure 1 The front view;

[0052] Figure 8 for Figure 1 Top view;

[0053] Figure 9 This is a schematic diagram of the arrangement of heat exchange equipment in the heat exchange system according to an embodiment of the present invention;

[0054] Figure 10 for Figure 9The front view;

[0055] Figure 11 This is a schematic diagram of the heat exchange system in an embodiment of the present invention;

[0056] Figure 12 This is a flowchart of waste heat recovery in an embodiment of the present invention.

[0057] In the diagram: 1-Sliding platform; 2-Heat exchanger; 3-Slide frame; 4-Hose; 5-Cooling bed; 6-Bearing body; 7-Main support frame; 8-Secondary support frame; 9-Heat exchange tube; 10-Tube sheet; 11-Guard plate; 12-First roller; 13-First moving wheel; 14-Second moving wheel; 15-Chain; 16-Baffle; 17-Horizontal block; 18-Second roller; 19-Connecting rod; 20-Power equipment; 21-Connecting section; 22-Pulley; 23-Main water inlet pipe; 24-Guide shroud; 100-Heat exchange equipment; 200-Soft water equipment; 300-Deaerator; 400-Steam network; 500-Steam drum; 601-Soft water pump; 602-Make-up water pump; 603-Feed water pump. Detailed Implementation

[0058] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to specific embodiments.

[0059] like Figures 1 to 8 As shown, a cooling bed heat exchanger 100 includes a sliding platform 1, a heat exchanger 2, a carriage 3, and a hose 4; the sliding platform 1 is supported above the cooling bed 5; the heat exchanger 2 can reciprocate along a preset direction on the sliding platform 1; the carriage 3 is supported above the sliding platform 1; the hose 4 is connected to the heat exchange tube 9 provided in the heat exchanger 2, and the hose 4 can follow the heat exchanger 2 in reciprocating along a preset direction on the carriage 3.

[0060] In this embodiment, the heat exchange equipment 100 has a carrier 6 and a main support frame 7; the carrier 6 is placed on the ground, and the cooling bed 5 is placed on the carrier 6; the sliding platform 1 is supported above the carrier 6 by the main support frame 7. The heat exchanger 2 has lifting lugs, which can be externally mechanically connected to the lifting lugs to assemble the heat exchanger 2 onto the sliding platform 1, allowing the heat exchanger 2 to slide on the sliding platform 1.

[0061] The carriage 3 is supported above the sliding platform 1 by a secondary support frame 8. The heat exchanger 2 has a heat exchange tube 9 through which softened water is introduced to achieve heat exchange. The flexible hose 4 is connected to the heat exchange tube 9 and is slidably connected to the carriage 3. Therefore, when the heat exchanger 2 moves on the sliding platform 1, it can drive the flexible hose 4 to move simultaneously.

[0062] Therefore, in this embodiment, the heat exchanger 2 has two stations. One station can normally realize heat exchange of the cooling bed 5, and the other station can enable the heat exchanger 2 to be moved to that location during maintenance, repair or steel flying, so that the staff can go there in time to handle it.

[0063] In this embodiment, the heat exchanger 2 is provided with a tube sheet 10, which can well support the heat exchange tubes 9; and the heat exchanger 2 has a protective plate 11, which is located on the non-tube sheet 10 side and / or outside the tube sheet 10, and is used to protect the heat exchange tubes 9.

[0064] In this embodiment, the surface of the heat exchange tube 9 is uniformly wrapped with fins, that is, the heat exchange area is increased by using high-frequency welded finned tubes, which greatly improves the heat exchange efficiency, thereby enabling the heat exchanger 2 to efficiently absorb the heat emitted from the surface of the cooling bed 5.

[0065] It should be noted that the elbows and welds of the heat exchange tube 9 are located on the outside of the tube sheet 10, which facilitates the installation and connection of the heat exchange tube 9.

[0066] To better utilize this embodiment, the heat exchanger 2 reciprocates along a preset direction on the sliding platform 1 via a drive mechanism; at least two first rollers 12 are provided on either side of the heat exchanger 2, and any one of the first rollers 12 is connected to the sliding platform 1; the drive mechanism includes a fixedly arranged first moving wheel 13 and a fixedly arranged second moving wheel 14; the second moving wheel 14 and the first moving wheel 13 are connected by a chain 15; one end of the chain 15 is connected to the end of the heat exchanger 2 near the first moving wheel 13, and the other end of the chain 15 is connected to the end of the heat exchanger 2 near the second moving wheel 14; the first moving wheel 13 and / or the second moving wheel 14 have a power device 20 for driving their rotation.

[0067] In this embodiment, the heat exchanger 2 has two first rollers 12 on both sides, with each first roller 12 located at the front and rear ends of the heat exchanger 2 respectively. In order to limit the reciprocating motion in a preset direction, baffles 16 are provided on the side of the two first rollers 12 that are close to each other at either end. Thus, when the external machinery places the heat exchanger 2 on the sliding platform 1 through the lifting lug, the two baffles 16 can limit the placement position of the heat exchanger 2 and ensure the uniqueness of the movement direction during the displacement of the heat exchanger 2.

[0068] In some embodiments, the sliding platform 1 has a horizontal block 17 protruding towards the other inner side on either side, extending from one end of the sliding platform 1 to the other. The heat exchanger 2 has a second roller 18, which is rotatably connected to the heat exchanger 2 via a connecting rod 19. Both rollers have torsion springs at their rotating parts. Thus, in this embodiment, during the installation of the heat exchanger 2 onto the sliding platform 1, the second roller 18 contacts the horizontal block 17, causing the connecting rod 19 to rotate relative to the heat exchanger 2. This allows the first roller 12 to be placed on the sliding platform 1. When the first roller 12 is stably placed on the sliding platform 1, the connecting rod 19, through the restoring force of the torsion spring, resets the position of the first roller 12. At this time, there is a gap between the first roller 12 and the horizontal block 17, and also a gap between the first roller 12 and the inner side of the sliding platform 1, thus not affecting the displacement of the heat exchanger 2 and facilitating the assembly of the heat exchanger 2 and the sliding platform 1.

[0069] The first moving wheel 13 and the second moving wheel 14 are both disposed on the sliding platform 1, located at opposite ends of the sliding platform 1. It can be understood that there can be two of each type of moving wheel 13 and moving wheel 14, located on opposite sides of the heat exchanger 2. That is, one side of the heat exchanger 2 has one first moving wheel 13 and one second moving wheel 14, and the other side of the heat exchanger 2 has another first moving wheel 13 and another second moving wheel 14. In this embodiment, the first moving wheel 13 has a power device 20; therefore, in this embodiment, there are two power devices 20.

[0070] It should be noted that the two power devices 20 should move synchronously to ensure the stable operation of the heat exchanger 2.

[0071] Of course, in some other embodiments, there are four power devices 20, two of which are located on the first driving wheel 13 and the other two are located on the second driving wheel 14. Therefore, the opening and closing of the power devices 20 are different when the heat exchanger 2 is displaced in different directions.

[0072] In this embodiment, when the first driving wheel 13 is driven in the forward direction, the chain 15 pulls the heat exchanger 2 towards the first driving wheel 13. When the first driving wheel 13 is driven in the reverse direction, the chain 15 pulls the heat exchanger 2 towards the second driving wheel 14. To better meet the driving requirements and improve driving efficiency, a chain tensioning mechanism is provided at the second driving wheel 14 in this embodiment. This tensioning mechanism is existing equipment and can be directly applied to the second driving wheel 14 by the operator.

[0073] To better utilize this embodiment, each hose 4 has several connecting segments 21; any one connecting segment 21 is connected to the carriage 3 via a trolley 22 so as to follow the heat exchanger 2 in reciprocating motion along a preset direction on the carriage 3.

[0074] The heat exchanger 2 has a main water inlet pipe 23, and the flexible hose 4 is connected to the main water inlet pipe 23. The position of the main water inlet pipe 23 is fixed. Thus, the flexible hose 4 is divided into several parts, some of which are connecting sections 21 for connecting to the trolley 22. Thus, the flexible hose 4 is initially wavy. When the first rotating wheel 13 is driven in the forward direction, the flexible hose 4 tends to straighten. When the first rotating wheel 13 is driven in the reverse direction, the flexible hose 4 returns to the wavy state.

[0075] To better utilize this embodiment, the carriage 3 is provided with a C-shaped groove, and the trolley 22 is slidably connected to the carriage 3 within the C-shaped groove.

[0076] In this embodiment, the sliding portion of the trolley 22 is limited within the C-shaped groove, thereby enabling the trolley 22 to carry the hose 4. In this embodiment, the trolley 22 and the corresponding connecting section 21 of the hose 4 are hinged to avoid damage to the pipe.

[0077] To better utilize this embodiment, the distance between the heat exchange equipment 100 and the cooling bed 5 is 900-1100mm.

[0078] Based on the actual scenario and the energy tiered utilization approach, and considering the actual requirements for emergency handling of the cooling bed 5, the optimal distance between the heat exchange equipment 100 and the cooling bed 5 is 900–1100 mm. This satisfies both reliability and stability requirements.

[0079] To better utilize this embodiment, a flow guide 24 is also included; the flow guide 24 is disposed between the cooling bed 5 and the heat exchanger 2, and is used to concentrate the hot air released by the steel on the cooling bed 5 to flow towards the heat exchanger 2.

[0080] The flow guide shroud 24 is inverted conical in shape, or in some embodiments, inverted hemispherical, with the purpose of concentrating hot air flow towards the heat exchanger 2 to further improve heat exchange efficiency. The larger diameter of the flow guide shroud 24 is located at the cooling bed 5, and the smaller diameter is located at the heat exchanger 2.

[0081] like Figures 9-11 As shown, based on the heat exchange equipment 100 described above, this embodiment also discloses a cold bed heat exchange system, including a plurality of cold bed heat exchange equipment 100 as described above; the plurality of cold bed heat exchange equipment 100 are arranged side by side.

[0082] In this embodiment, there are 8 to 10 heat exchangers 2, which are arranged side by side to increase the heat exchange area.

[0083] To better utilize this embodiment, it also includes a water softening unit 200, a deaerator 300, a steam pipeline network 400, and a steam drum 500; the deaerator 300 is connected to the water softening unit 200 and the heat exchange unit 100; the steam pipeline network 400 is connected to the heat exchange unit 100 of the cooling bed 5; the steam drum 500 is connected to the deaerator 300, the heat exchange unit 100, and the steam pipeline network 400; the softened water provided by the water softening unit 200, after being deoxygenated by the deaerator 300, enters the heat exchange surface of the heat exchanger 2 to absorb the residual heat emitted by the cooling bed 5 rods, forming a saturated steam-water mixture under a specific pressure, and then the saturated steam-water mixture enters the steam drum 500 for steam-water separation, after which the liquid water enters the heat exchanger 2 to form a water circulation, and the steam, after separation, enters the steam pipeline network 400.

[0084] In this embodiment, the cooling bed 5 has a high-temperature zone and a low-temperature zone; each heat exchanger 100 has two heat exchangers 2 arranged side by side, and the two heat exchangers 2 are fixedly connected to each other, thereby expanding the heat exchange surface; the two heat exchangers 2 are respectively arranged in the high-temperature zone and the low-temperature zone of the cooling bed 5. The heat exchanger 2 in the low-temperature zone mainly relies on natural convection heat exchange, while the heat exchanger 2 in the high-temperature zone relies on radiation plus natural convection heat exchange; after the waste heat recovery system is started normally, both the low-temperature zone and the high-temperature zone are in a saturated state under a specific pressure; the softened water in the heat exchanger 2 in the high-temperature zone exists in the form of a steam-water mixture. The fluid flows from the heat exchanger 2 in the high-temperature zone through the riser pipe into the steam drum 500. After steam-water separation, the steam enters the steam pipe network 400, and the water enters the next cycle. Thus, when the softened water passes through the heat exchanger 2 in the low-temperature zone, it quickly absorbs radiant heat, and a steam-water mixture can be obtained in a short time. After circulation, it flows into the heat exchanger 2 in the high-temperature zone to form saturated steam at 170-180°C, and the generated saturated steam is then collected into the steam pipe network 400 for power generation.

[0085] The heat exchange system includes a circulating pump skid, which comprises a soft water pump 601, a makeup water pump 602, and a feed water pump 603. The soft water pump 601 is positioned between the softened water equipment 200 and the deaerator 300, the makeup water pump 602 is positioned between the deaerator 300 and the steam drum 500, and the feed water pump 603 is positioned between the steam drum 500 and the heat exchange equipment 100. Thus, the circulating pump skid provides output power to the softened water, thereby better meeting the heat exchange requirements.

[0086] like Figure 12 As shown, this embodiment also discloses a waste heat recovery method, applied to the cold bed heat exchange system described above; the heat exchange method includes:

[0087] S100, using a water softening equipment to output 200 softened water;

[0088] S200, after being deaerated by deaerator 300, enters steam drum 500;

[0089] S300, enters heat exchanger 2 and quickly absorbs radiant heat to form a steam-water mixture; that is, softened water absorbs residual heat from the cold bed through the heat exchange surfaces of the low temperature zone and high temperature zone to form a saturated steam-water mixture.

[0090] S400, the steam-water mixture is separated into liquid water and saturated steam by the 500 steam drum;

[0091] S501. Saturated steam enters the steam pipeline 400, and the steam pipeline 400 outputs the saturated steam to the power generation equipment for power generation.

[0092] S502, liquid water and newly added softened water flow into the steam drum 500, and the above steps are repeated.

[0093] To better utilize this embodiment, a water supply pump 602 is provided between the steam drum 500 and the deaerator 300; the steam drum 500 controls the water supply pump 602 via frequency conversion using three-impulse PID regulation. Because the steam drum 500 uses three-impulse PID regulation, the liquid level in the steam drum 500 can be kept within a safe range, thereby achieving better heat exchange.

[0094] Furthermore, it should be noted that in this embodiment, the water level control of the deaerator 300 and the water level control of the steam drum 500 are both achieved by using a three-impulse PID controller; and each heat exchanger 2 has an independent flow meter and regulating valve at its heat exchange surface water inlet to adjust the flow rate of each heat exchange surface individually, ensuring overall water distribution balance.

[0095] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be considered as limitations on the present invention, and the scope of protection of the present invention should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A cooling bed heat exchanger, characterized in that, include: A sliding platform, which is supported above the cooling bed; A heat exchanger that can reciprocate along a preset direction on a sliding platform; A carriage, which is supported above a sliding platform; as well as The hose is connected to the heat exchange tubes of the heat exchanger and can reciprocate along a preset direction on the slide; The heat exchanger reciprocates along a preset direction on a sliding platform via a drive mechanism; at least two first rollers are provided on any one side of the heat exchanger, and any one of the first rollers is connected to the sliding platform. The drive mechanism includes: The first moving wheel is fixedly set; and A fixed second driving wheel is connected to the first driving wheel by a chain; Wherein, one end of the chain is connected to the end of the heat exchanger near the first moving wheel, and the other end of the chain is connected to the end of the heat exchanger near the second moving wheel; the first moving wheel and / or the second moving wheel have a power device for driving their rotation.

2. The cooling bed heat exchange equipment as described in claim 1, characterized in that, Each hose has several connecting sections; any one connecting section is connected to the carriage via a trolley so that it can reciprocate along a preset direction on the carriage following the heat exchanger.

3. The cooling bed heat exchange equipment as described in claim 2, characterized in that, The carriage is provided with a C-shaped groove, and the trolley is slidably connected to the carriage within the C-shaped groove.

4. The cooling bed heat exchange equipment as described in claim 1, characterized in that, The distance between the heat exchange equipment and the cooling bed is 900-1100mm.

5. A cooling bed heat exchange equipment as described in any one of claims 1 to 4, characterized in that, Also includes: A flow guide shroud is disposed between the cooling bed and the heat exchanger to concentrate the hot air released by the steel on the cooling bed and direct it towards the heat exchanger.

6. A cooling bed heat exchange system, characterized in that, include: Several cooling bed heat exchange devices as described in any one of claims 1 to 5; Several cooling bed heat exchangers are set up side by side.

7. A cooling bed heat exchange system as described in claim 6, characterized in that, Also includes: Water softening equipment; A deaerator, which is connected to the water softening equipment and the heat exchange equipment; A steam pipeline network, which is connected to the cooling bed heat exchange equipment; as well as Steam drum, which is connected to a deaerator, heat exchange equipment and steam pipeline network; The softened water provided by the softening water equipment is deoxygenated by the deaerator and then enters the heat exchange surface of the heat exchanger to absorb the residual heat emitted by the cooling bed bars, forming a saturated steam-water mixture under a specific pressure. The saturated steam-water mixture then enters the steam drum for steam-water separation. After that, the liquid water enters the heat exchanger to form a water circulation. After steam separation, it enters the steam pipeline network.

8. A waste heat recovery method, characterized in that, Applied to the cooling bed heat exchange system as described in claim 7; the waste heat recovery method includes: Softened water is output from the water softening equipment, deoxygenated by the deaerator, and then enters the steam drum. It then enters the heat exchanger to quickly absorb radiant heat and form a steam-water mixture. The steam-water mixture is separated into liquid water and saturated steam by a steam drum. Saturated steam enters the steam pipeline network, which then outputs the saturated steam to the power generation equipment for power generation. Liquid water and newly added softened water flow into the steam drum, and the above steps are repeated.

9. A waste heat recovery method as described in claim 8, characterized in that, A water supply pump is provided between the steam drum and the deaerator; The steam drum is controlled by a three-impulse PID controller to regulate the frequency of the water supply pump.

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