Low pressure rolling mill steam recycling device

Abstract

The utility model relates to a kind of low-pressure steel rolling steam recycling device, belong to steam recycling technical field. Including recovery tank and heat exchange component, the internal cavity of recovery tank is divided into upper steam area and bottom liquid storage area, the bottom center position of recovery tank is fixedly connected with drain pipe, the top of recovery tank is connected with tank cover, tank cover is fixedly connected with exhaust pipe, the middle lower part of steam area in recovery tank is fixedly connected with annular air inlet pipe, the bottom of annular air inlet pipe is detachably connected with several air inlet bends along circumference, heat exchange component is set in the steam area in recovery tank. The utility model is scraped by setting scraper assembly outside each heat exchange pipe, drive component can drive scraper assembly to slide along the outside of heat exchange pipe vertically, so that condensate film and iron oxide skin etc. Solid impurities attached to the outer wall of heat exchange pipe are scraped, so that heat transfer resistance is greatly eliminated, and heat exchange efficiency is improved, steam can be effectively recycled.

Description

Technical Field

[0001] This utility model relates to the field of steam recovery and utilization technology, and in particular to a low-pressure steel rolling steam recovery and utilization device. Background Technology

[0002] The steel industry is a major energy consumer, accounting for a significant portion of total industrial energy consumption. The steel rolling process generates a large amount of low-pressure steam, which, if not recovered and utilized, is directly released into the atmosphere, representing a huge waste of energy. Against the backdrop of energy scarcity, recovering and utilizing low-pressure steel rolling steam can help alleviate the energy pressure on steel companies, improve energy efficiency, and achieve sustainable energy development.

[0003] Because rolling mill steam carries solid impurities such as iron oxide scale, these impurities easily deposit and adhere to the heat exchanger walls through which the steam flows during steam recovery, forming a scale layer with extremely poor thermal conductivity. This further increases thermal resistance, thus affecting heat exchange efficiency and hindering the effective recovery and utilization of low-pressure rolling mill steam. Secondly, when steam condenses on the heat exchanger walls, it first forms discrete droplets, which then coalesce into a continuous condensate film. This film covering the heat exchanger surface creates additional heat transfer resistance, severely impeding heat transfer and further affecting the heat exchange effect. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a low-pressure steel rolling steam recovery and utilization device. The technical solution of this utility model is as follows: A low-pressure steel rolling steam recovery and utilization device includes a recovery tank and a heat exchange assembly. The internal cavity of the recovery tank is divided into an upper steam zone and a bottom liquid storage zone. A drain pipe is fixedly connected to the center of the bottom of the recovery tank. A tank cover is connected to the top of the recovery tank, and an exhaust pipe is fixedly connected to the tank cover. An annular air inlet pipe is fixedly connected to the lower middle part of the steam zone in the recovery tank. Several air inlet bends are detachably connected to the bottom of the annular air inlet pipe along the circumference. The heat exchange assembly is disposed in the steam zone of the recovery tank. The outlet ends of the several air inlet bends are annularly arranged around the outer side of the lower half of the heat exchange assembly. An annular water inlet pipe is connected to the top of the heat exchange assembly and is fixedly connected to the top of the steam zone in the recovery tank. An annular water outlet pipe is connected to the bottom of the heat exchange assembly and is fixedly connected to the bottom of the steam zone in the recovery tank. The heat exchange assembly includes multiple cylindrical heat exchange tubes arranged in a circumferential direction. Each heat exchange tube has a scraper assembly vertically slidable on its outer side for scraping off the deposits attached to its outer side. The tank cover is connected to a drive assembly for driving the multiple sets of scraper assemblies to move vertically.

[0005] Optionally, the inner top wall of the can lid, located below the exhaust pipe, is fixedly connected to a baffle plate by multiple sets of support rods, the size of which is larger than the diameter of the exhaust pipe.

[0006] Optionally, an outer air intake pipe is fixedly connected to one side of the annular air intake pipe. The outer air intake pipe penetrates the side wall of the recovery tank and extends to the outside of the recovery tank. Several air intake ducts connected to the inside of the annular air intake pipe are fixedly arranged at equal intervals along the circumference at the bottom of the annular air intake pipe. The air intake bend includes vertical pipe sections and inclined pipe sections connected to each other. A bend is provided between the vertical pipe section and the inclined pipe section. The extension direction of the inclined pipe section is inclined downward relative to the horizontal plane. The vertical pipe section is threaded on the outside of the air intake duct.

[0007] Optionally, the heat exchange tubes are fixedly connected to both the upper and lower ends with connecting pipes, and the ends of the connecting pipes are fixedly connected to connecting flange one. An outer water inlet pipe is fixedly connected to one side of the annular water inlet pipe, penetrating the side wall of the recovery tank and extending to the outside of the recovery tank. The bottom of the annular water inlet pipe is equidistantly provided with water inlet branch pipes at the same circumferential distance as the number of heat exchange tubes. The ends of the water inlet branch pipes are fixedly connected to connecting flange two. Multiple sets of connecting flange one located above are respectively fixed to corresponding connecting flange two locations by bolts. An outer water outlet pipe is fixedly connected to one side of the annular water outlet pipe, penetrating the side wall of the recovery tank and extending to the outside of the recovery tank. The top of the annular water outlet pipe is equidistantly provided with water outlet branch pipes at the same circumferential distance as the number of heat exchange tubes. The ends of the water outlet branch pipes are fixedly connected to connecting flange three. Multiple sets of connecting flange one located below are respectively fixed to corresponding connecting flange three locations by bolts.

[0008] Optionally, the scraper assembly includes two sets of C-shaped scraper groups symmetrically sleeved on the outside of the heat exchange tube. Each C-shaped scraper group includes a fixing buckle, a scraper, and a flow guide seat. The fixing buckles of the two sets of C-shaped scraper groups are fastened to each other by locking bolts. The scraper is detachably connected to the lower end of the fixing buckle and is inclined downward inward relative to the heat exchange tube. The flow guide seat is detachably connected to the upper end of the fixing buckle and is inclined downward outward relative to the heat exchange tube.

[0009] Optionally, the upper surface of the fixing buckle is provided with a groove, and the two ends of the fixing buckle are fixedly connected with ear plates for installing locking bolts. The lower surface of the flow guide seat is fixedly connected with a protrusion, which is inserted into the inside of the groove and the two are fixed by bolts.

[0010] Optionally, the scraper includes a fixing plate and a scraper blade. The fixing plate is fixedly connected to the lower surface of the fixing buckle by bolts, and the scraper blade is fixedly connected to the lower surface of the scraper blade with the scraping edge facing the heat exchange tube.

[0011] Optionally, the drive assembly includes an annular frame for connecting multiple scraper assemblies and a linear actuator for driving the annular frame to move vertically. The fixed end of the linear actuator is fixedly connected to the upper end of the can lid via a support frame, and the telescopic end of the linear actuator slides through the can lid and extends into the interior of the can lid. The telescopic end of the linear actuator is connected to the annular frame.

[0012] Optionally, the annular frame includes an outer ring seat and a central disk arranged coaxially. The outer ring seat is arranged around the outside of the heat exchange assembly, and the central disk is located at the center of the heat exchange assembly. The lower surface of the outer ring seat is fixedly connected with outer L-shaped brackets at equal intervals along the circumference, corresponding to the number of heat exchange tubes. The lateral end of each outer L-shaped bracket is fixedly connected to one set of fixing buckles in a scraper assembly. The lower surface of the central disk is fixedly connected with inner L-shaped brackets at equal intervals along the circumference, corresponding to the number of heat exchange tubes. The lateral end of each inner L-shaped bracket is fixedly connected to another set of fixing buckles in the same scraper assembly. A column is fixedly connected to the center of the upper surface of the central disk. A connecting flange four is fixedly connected to the upper end of the column. The connecting flange four is fixedly connected to the telescopic end of the linear actuator.

[0013] Optionally, the linear actuator is a cylinder.

[0014] All of the above optional technical solutions can be combined arbitrarily, and this utility model does not provide a detailed description of the structure after each combination.

[0015] The beneficial effects of this utility model through the above solution are as follows: This invention features a scraper assembly installed on the outer side of each heat exchange tube. A drive assembly propels the scraper assembly vertically along the outer side of the heat exchange tube, thereby scraping away the condensate film adhering to the outer wall of the tube. This significantly reduces heat transfer resistance, improves heat exchange efficiency, and allows for effective steam recovery and reuse. Furthermore, while scraping away the condensate film, the scraper assembly also removes solid impurities such as iron oxide scale adhering to the outer side of the heat exchange tube, effectively reducing scale buildup.

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall appearance structure of the low-pressure steel rolling steam recovery and utilization device provided by this utility model; Figure 2 Main sectional view of the low-pressure steel rolling steam recovery and utilization device provided by this utility model; Figure 3Left sectional view of the low-pressure steel rolling steam recovery and utilization device provided by this utility model; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 An exploded structural diagram of the low-pressure steel rolling steam recovery and utilization device provided by this utility model; Figure 6 This is a schematic diagram of the structure of the annular air inlet pipe, air inlet bend pipe, heat exchange component, annular water inlet pipe, annular water outlet pipe, scraper component and drive component in this utility model. Figure 7 This is an exploded structural diagram of the annular air inlet pipe, air inlet bend pipe, heat exchange component, annular water inlet pipe, annular water outlet pipe, scraper component and drive component in this utility model. Figure 8 This is an exploded structural diagram of the annular intake pipe and the intake bend pipe in this utility model. Figure 9 This is an exploded structural diagram of the scraper assembly and the ring frame in this utility model; Figure 10 This is an exploded view of the scraper assembly in this utility model. Figure 1 ; Figure 11 This is an exploded view of the scraper assembly in this utility model. Figure 2 .

[0018] Numbered in the diagram: 1. Recovery tank; 11. Steam zone; 12. Liquid storage zone; 13. Drain pipe; 2. Tank cover; 21. Exhaust pipe; 211. Support rod; 212. Baffle plate; 22. Manhole cover; 23. Support frame; 3. Annular air inlet pipe; 31. Air inlet outer pipe; 32. Air inlet duct; 33. U-shaped buckle; 4. Air inlet bend; 41. Vertical pipe section; 42. Inclined pipe section; 5. Heat exchange assembly; 51. Heat exchange tube; 511. Connecting pipe; 512. Connecting flange one; 6. Annular water inlet pipe; 61. Water inlet outer pipe; 62. Water inlet branch pipe; 63. Connecting flange two; 64. Upper support. 7. Frame; 71. Annular water outlet pipe; 72. Outer water outlet pipe; 73. Outer water branch pipe; 74. Connecting flange three; 8. Lower bracket; 9. Scraper assembly; 81. C-type scraper assembly; 811. Fixing buckle; 8111. Groove; 8112. Ear plate; 812. Scraper; 8121. Fixing plate; 8122. Scraper; 813. Flow guide seat; 814. Protrusion; 9. Drive assembly; 91. Annular frame; 911. Outer ring seat; 912. Outer L-shaped bracket; 913. Center plate; 914. Inner L-shaped bracket; 915. Column; 916. Connecting flange four; 92. Linear actuator. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0020] Please see Figure 1-11 This utility model provides a low-pressure steel rolling steam recovery and utilization device, including a recovery tank 1 and a heat exchange assembly 5. The internal cavity of the recovery tank 1 is divided into an upper steam zone 11 and a bottom liquid storage zone 12. A drain pipe 13 is fixedly connected to the center of the bottom of the recovery tank 1. A tank cover 2 is connected to the top of the recovery tank 1, and an exhaust pipe 21 is fixedly connected to the tank cover 2. A manhole cover 22 is also fixedly connected to the tank cover 2. An annular air inlet pipe 3 is fixedly connected to the lower middle part of the steam zone 11 in the recovery tank 1 through multiple sets of U-shaped buckles 33. The bottom of the heat exchanger is detachably connected with several air inlet bends 4 along the circumference. The heat exchanger 5 is set in the steam zone 11 in the recovery tank 1. The outlet ends of the several air inlet bends 4 are arranged in a ring around the outside of the lower half of the heat exchanger 5. The top of the heat exchanger 5 is connected with a ring water inlet pipe 6. The ring water inlet pipe 6 is fixedly connected to the top of the steam zone 11 in the recovery tank 1 by multiple sets of upper brackets 64. The bottom of the heat exchanger 5 is connected with a ring water outlet pipe 7. The ring water outlet pipe 7 is fixedly connected to the bottom of the steam zone 11 in the recovery tank 1 by multiple sets of lower brackets 74. The heat exchange assembly 5 includes multiple cylindrical heat exchange tubes 51 arranged in a circumferential direction. Each heat exchange tube 51 has a scraper assembly 8 vertically slidably mounted on its outer side for scraping off the deposits attached to its outer side. The tank cover 2 is connected to a drive assembly 9 for driving the multiple sets of scraper assemblies 8 to move vertically.

[0021] This invention utilizes a scraper assembly 8 installed on the outer side of each heat exchange tube 51. The drive assembly 9 can drive the scraper assembly 8 to slide vertically along the outer side of the heat exchange tube 51, thereby scraping away the condensate film adhering to the outer wall of the heat exchange tube 51. This significantly reduces heat transfer resistance, improves heat exchange efficiency, and allows for effective steam recovery and utilization. Furthermore, while scraping away the condensate film, the scraper assembly 8 also removes solid impurities such as iron oxide scale adhering to the outer side of the heat exchange tube 51, effectively reducing the occurrence of scale buildup.

[0022] Specifically, low-pressure rolling steam enters through the annular inlet pipe 3, then flows through several inlet bends 4 into the steam zone 11 within the recovery tank 1, and flows upwards through the heat exchange assembly 5. Meanwhile, water inside the heat exchange tubes 51 enters the heat exchange assembly 5 through the annular water inlet pipe 6 at the top. Upon encountering the cold heat exchange tubes 51, the steam adheres to the outer wall of the tubes and condenses into droplets, thus heating the water inside. The droplets slide down the outer wall of the heat exchange tubes 51 into the liquid storage zone 12 of the recovery tank 1 and can be discharged through the drain pipe 13. The heated water flows out through the annular water outlet pipe 7 at the bottom, thus completing the heat exchange. Uncondensed waste gas and a small amount of steam are discharged through the exhaust pipe 21. During this process, the scraper assembly 8 can be driven vertically along the outside of the heat exchange tube 51 periodically by the drive assembly 9, thereby scraping off the condensate film and iron oxide scale and other impurities attached to the outer wall of the heat exchange tube 51, which greatly eliminates the heat transfer resistance, effectively reduces the occurrence of impurity deposition and scaling, improves the heat exchange efficiency, and enables the effective recovery and utilization of steam.

[0023] By setting up annular air inlet pipe 3 and circumferentially distributed air inlet bends 4, steam enters evenly and circumferentially from the lower half of the heat exchange component 5, increasing the contact area and residence time between the steam and the heat exchange surface, and further promoting efficient heat exchange.

[0024] Preferably, the bottom of the recovery tank 1 is made of an arc-shaped shell, which facilitates the smooth collection and discharge of condensate and scraped impurities. The tank cover 2 is also made of an arc-shaped shell, so that when the steam condenses into droplets, the droplets can slide down along the arc-shaped shell of the tank cover 2 and smoothly enter the liquid storage area 12, thereby improving the collection efficiency of condensate.

[0025] Furthermore, a baffle 212 is fixedly connected to the inner top wall of the can lid 2 and below the exhaust pipe 21 by multiple sets of support rods 211. The size of the baffle 212 is larger than the diameter of the exhaust pipe 21.

[0026] Specifically, by installing a baffle 212 below the exhaust pipe 21, steam can be prevented from being discharged directly from the exhaust pipe 21, reducing the amount of droplets carried out with the steam. When steam flows through the exhaust pipe 21, the baffle 212 can block the droplets in the steam, causing the droplets to condense or flow back inside the tank.

[0027] Furthermore, an outer air intake pipe 31 is fixedly connected to one side of the annular air intake pipe 3. The outer air intake pipe 31 penetrates the side wall of the recovery tank 1 and extends to the outside of the recovery tank 1. Several air intake ducts 32 that communicate with the inside of the annular air intake pipe 3 are fixedly provided at equal intervals along the circumference at the bottom of the annular air intake pipe 3. The air intake bend 4 includes a vertical pipe section 41 and an inclined pipe section 42 that are connected to each other. A bend is provided between the vertical pipe section 41 and the inclined pipe section 42. The extension direction of the inclined pipe section 42 is inclined downward relative to the horizontal plane. The vertical pipe section 41 is threaded on the outside of the air intake duct 32.

[0028] Specifically, when steam enters the annular intake pipe 3 from the outer intake pipe 31, liquid droplets adhere to the inner wall of the annular intake pipe 3. These droplets can then flow along the intake conduit 32 at the bottom of the annular intake pipe 3 into the intake bend 4. The inclined section 42 of the intake bend 4 is tilted downwards relative to the horizontal plane, ensuring smooth discharge of internal liquid and preventing liquid accumulation inside the annular intake pipe 3, thus ensuring unobstructed fluid flow. Furthermore, the vertical section 41 is connected to the intake conduit 32 via a threaded connection, allowing for quick replacement if the intake bend 4 becomes blocked or damaged.

[0029] Furthermore, connecting pipes 511 are fixedly connected to both the upper and lower ends of the heat exchange tube 51. A connecting flange 512 is fixedly connected to the end of each connecting pipe 511. An external water inlet pipe 61 is fixedly connected to one side of the annular water inlet pipe 6. The external water inlet pipe 61 penetrates the side wall of the recovery tank 1 and extends to the outside of the recovery tank 1. A number of water inlet branch pipes 62, equal in number to the heat exchange tubes 51, are fixedly installed at equal intervals along the circumference of the bottom of the annular water inlet pipe 6. A connecting flange 63 is fixedly connected to the end of each water inlet branch pipe 62. Multiple sets of connecting flanges located above... 512 is fixed to the corresponding connecting flange 63 by bolts. One side of the annular water outlet pipe 7 is fixedly connected to the water outlet pipe 71. The water outlet pipe 71 penetrates the side wall of the recovery tank 1 and extends to the outside of the recovery tank 1. The top of the annular water outlet pipe 7 is fixedly provided with water outlet branch pipes 72 at equal intervals along the circumference, which is the same number as the heat exchange pipe 51. The end of the water outlet branch pipe 72 is fixedly connected to the connecting flange 73. The multiple sets of connecting flanges 512 located below are fixed to the corresponding connecting flanges 73 by bolts.

[0030] Specifically, the upper end of the heat exchange tube 51 is detachably connected to the annular inlet pipe 6, and the lower end of the heat exchange tube 51 is detachably connected to the annular outlet pipe 7, which facilitates the subsequent replacement of a single heat exchange tube 51.

[0031] Furthermore, the scraper assembly 8 includes two sets of C-shaped scraper groups 81 symmetrically sleeved on the outside of the heat exchange tube 51. Each C-shaped scraper group 81 includes a fixing buckle 811, a scraper 812, and a flow guide seat 813. The fixing buckles 811 of the two sets of C-shaped scraper groups 81 are fastened to each other by locking bolts. The scraper 812 is detachably connected to the lower end of the fixing buckle 811. The scraper 812 is inclined downwards and inwards relative to the heat exchange tube 51. The flow guide seat 813 is detachably connected to the upper end of the fixing buckle 811. The upper surface of the flow guide seat 813 is inclined downwards and outwards relative to the heat exchange tube 51.

[0032] Specifically, two sets of symmetrical C-shaped scraper assemblies 81 are fastened together with locking bolts, forming a ring structure that can be tightly fastened to the outer wall of the heat exchange tube 51 and easily disassembled. Secondly, both the guide seat 813 and the scraper 812 are detachably connected to the fixing buckle 811. This means that when the scraper 812 wears or a component is damaged, it can be replaced individually without replacing the entire assembly, greatly reducing maintenance costs and time. Furthermore, the upper surface of the guide seat 813 is inclined downwards outwards relative to the heat exchange tube 51, while the scraper 812 is inclined downwards inwards relative to the heat exchange tube 51. This arrangement is intended to allow the scraper assemblies 812 to effectively scrape away the liquid film and impurities adhering to the outer wall of the heat exchange tube 51 when the drive assembly 9 drives the scraper assembly 8 to move downwards, guiding them downwards and away. Under continuous air intake conditions, new droplets will rapidly condense on the outer wall of the heat exchange tube 51 during the scraping interval. The scraper 812 is inclined inward and downward relative to the heat exchange tube 51. At this time, the scraper 812 surrounding the outside of the heat exchange tube 51 forms an "inverted umbrella" structure. Therefore, when the scraper assembly 8 returns to its original position, these temporarily formed droplets will be "caught" by the scraper 812 and carried to the upper end. At this time, under the action of the guide seat 813, the newly formed droplets on the outer wall of the heat exchange tube 51 can be pushed upward and dispersed to both sides during the resetting process, thereby effectively preventing droplets from entering the interior of the scraper assembly 8 or being carried upward.

[0033] Preferably, the main function of the guide seat 813 is to scrape away newly attached droplets on the outer wall of the heat exchange tube 51 during the upward movement of the scraper assembly 8. The guide seat 813 can be made of high-performance engineering plastic material (such as polytetrafluoroethylene). The main function of the scraper 812 is to scrape away droplets and impurities attached to the outer wall of the heat exchange tube 51 during the downward movement of the scraper assembly 8. The scraper 812 can be made of high-performance engineering plastic (such as polyurethane) or soft metal material (such as bronze) to avoid causing hard scratches to the outer wall of the heat exchange tube 51.

[0034] Furthermore, a groove 8111 is provided on the upper surface of the fixing buckle 811, and ear plates 8112 for installing locking bolts are fixedly connected to both ends of the fixing buckle 811 in the circumferential direction. A protrusion 814 is fixedly connected to the lower surface of the flow guide seat 813. The protrusion 814 is inserted into the inside of the groove 8111 and the two are fixed by bolts.

[0035] Specifically, when the flow guide seat 813 is damaged, the bolts used to fix the protrusion 814 and the groove 8111 can be removed, and then the protrusion 814 can be removed from the groove 8111. At this time, the flow guide seat 813 can be easily removed.

[0036] Furthermore, the scraper 812 includes a fixing plate 8121 and a scraper 8122. The fixing plate 8121 is fixedly connected to the lower surface of the fixing buckle 811 by bolts, and the scraper 8122 is fixedly connected to the lower surface of the scraper 812 with the scraping blade facing the heat exchange tube 51.

[0037] Specifically, the scraper 812 and the fixing buckle 811 adopt a detachable structure. When the scraper blade 8122 of the scraper 812 is damaged, it can be easily removed and replaced.

[0038] Furthermore, the drive assembly 9 includes an annular frame 91 for connecting multiple scraper assemblies 8 and a linear actuator 92 for driving the annular frame 91 to move vertically. The fixed end of the linear actuator 92 is fixedly connected to the upper end of the can lid 2 via a support frame 23. The telescopic end of the linear actuator 92 slides through the can lid 2 and extends into the interior of the can lid 2. The telescopic end of the linear actuator 92 is connected to the annular frame 91.

[0039] Furthermore, the annular frame 91 includes an outer ring seat 911 and a central disk 913 arranged coaxially. The outer ring seat 911 is arranged around the outside of the heat exchange assembly 5, and the central disk 913 is located at the center of the heat exchange assembly 5. The lower surface of the outer ring seat 911 is fixedly connected with an outer L-shaped bracket 912 at equal intervals along the circumference, which is the same as the number of heat exchange tubes 51. The lateral edge end of each outer L-shaped bracket 912 is fixedly connected to one set of fixing buckles 811 in a scraper assembly 8. The lower surface of the central disk 913 is fixedly connected with an inner L-shaped bracket 914 at equal intervals along the circumference, which is the same as the number of heat exchange tubes 51. The lateral edge end of the inner L-shaped bracket 914 is fixedly connected to another set of fixing buckles 811 in the same scraper assembly 8. A column 915 is fixedly connected to the center of the upper surface of the central disk 913. A connecting flange 916 is fixedly connected to the upper end of the column 915. The connecting flange 916 is fixedly connected to the telescopic end of the linear actuator 92.

[0040] Specifically, when the scraper assembly 8 needs to slide downwards, the telescopic end of the linear actuator 92 extends downwards, thereby driving the central disk 913 and the inner L-shaped bracket 914 to slide the scraper assembly 8 downwards, thus scraping away droplets and impurities from the outer wall of the heat exchange tube 51. When the scraper assembly 8 needs to slide upwards, the telescopic end of the linear actuator 92 retracts upwards, thereby indirectly driving the scraper assembly 8 to slide upwards along the heat exchange tube 51. During this process, the outer ring seat 911 and the outer L-shaped bracket 912 can connect the outer sides of all scraper assemblies 8, ensuring the synchronous movement of multiple sets of scraper assemblies 8. Furthermore, a positioning slide rod (not shown in the figure) that slides vertically against the inner wall of the recovery tank 1 can also be provided on the outer side of the outer ring seat 911.

[0041] Furthermore, the linear actuator 92 employs a cylinder.

[0042] Specifically, the piston rod of the cylinder passes through the can cover 2 and extends into the interior of the can cover 2. To ensure sealing, a dynamic sealing structure should be provided at the sliding contact point between the piston rod and the can cover 2. In the non-cleaning state, the piston rod retracts into the cylinder; it only extends in the cleaning state.

[0043] It should be noted that: 1. The drain pipe 13, exhaust pipe 21, air inlet pipe 31, water inlet pipe 61, and water outlet pipe 71 mentioned above are all equipped with corresponding control valves and auxiliary detectors. This structure is existing technology and will not be described in detail here. 2. The linear actuator 92 can also use other linear telescopic devices besides cylinders, and the linear actuator 92 is electrically connected to the control terminal, so it can be controlled and operated through the control terminal.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A low-pressure steel rolling steam recovery and utilization device, characterized in that: The system includes a recovery tank (1) and a heat exchange assembly (5). The internal cavity of the recovery tank (1) is divided into an upper steam zone (11) and a bottom liquid storage zone (12). A drain pipe (13) is fixedly connected to the center of the bottom of the recovery tank (1). A tank cover (2) is connected to the top of the recovery tank (1). An exhaust pipe (21) is fixedly connected to the tank cover (2). An annular air inlet pipe (3) is fixedly connected to the lower middle part of the steam zone (11) in the recovery tank (1). Several air inlets are detachably connected to the bottom of the annular air inlet pipe (3) along the circumferential direction. The heat exchange assembly (5) is set in the steam zone (11) of the recovery tank (1). The outlet ends of several air inlet bends (4) are arranged in a ring around the lower half of the heat exchange assembly (5). The top of the heat exchange assembly (5) is connected to an annular water inlet pipe (6). The annular water inlet pipe (6) is fixedly connected to the top of the steam zone (11) in the recovery tank (1). The bottom of the heat exchange assembly (5) is connected to an annular water outlet pipe (7). The annular water outlet pipe (7) is fixedly connected to the bottom of the steam zone (11) in the recovery tank (1). The heat exchange assembly (5) includes multiple cylindrical heat exchange tubes (51) arranged in a circumferential direction. Each heat exchange tube (51) has a scraper assembly (8) vertically slidably mounted on its outer side for scraping off the attached material. The can lid (2) is connected to a drive assembly (9) for driving multiple sets of scraper assemblies (8) to move vertically.

2. The low-pressure steel rolling steam recovery and utilization device according to claim 1, characterized in that, The inner top wall of the can lid (2) and below the exhaust pipe (21) is fixedly connected to a baffle (212) by multiple sets of support rods (211), the size of which is larger than the diameter of the exhaust pipe (21).

3. The low-pressure steel rolling steam recovery and utilization device according to claim 1, characterized in that, An air inlet pipe (3) is fixedly connected to one side of the annular air inlet pipe (3). The air inlet pipe (31) penetrates the side wall of the recovery tank (1) and extends to the outside of the recovery tank (1). At the bottom of the annular air inlet pipe (3), several air inlet ducts (32) that communicate with the inside of the annular air inlet pipe (3) are fixedly provided at equal intervals along the circumference. The air inlet bend (4) includes a vertical pipe section (41) and an inclined pipe section (42) that are connected to each other. A bend is provided between the vertical pipe section (41) and the inclined pipe section (42). The extension direction of the inclined pipe section (42) is inclined downward relative to the horizontal plane. The vertical pipe section (41) is threaded on the outside of the air inlet duct (32).

4. The low-pressure steel rolling steam recovery and utilization device according to claim 1, characterized in that, The heat exchange tube (51) is fixedly connected to both the upper and lower ends with connecting pipes (511). The end of the connecting pipe (511) is fixedly connected with a connecting flange (512). The annular water inlet pipe (6) is fixedly connected to one side with an outer water inlet pipe (61). The outer water inlet pipe (61) penetrates the side wall of the recovery tank (1) and extends to the outside of the recovery tank (1). The bottom of the annular water inlet pipe (6) is fixedly provided with water inlet branch pipes (62) at equal intervals along the circumference, the number of which is the same as that of the heat exchange tube (51). The end of the water inlet branch pipe (62) is fixedly connected with a connecting flange (63). The multiple sets of connecting flanges located above are... (512) The connecting flanges (63) at the corresponding positions are fixed with bolts. The annular water outlet pipe (7) is fixedly connected to one side of the water outlet pipe (71). The water outlet pipe (71) penetrates the side wall of the recovery tank (1) and extends to the outside of the recovery tank (1). The top of the annular water outlet pipe (7) is fixedly provided with water outlet branch pipes (72) at equal intervals along the circumference, which are the same number as the heat exchange pipes (51). The end of the water outlet branch pipe (72) is fixedly connected to the connecting flange (73). The multiple sets of connecting flanges (512) located below are fixed to the connecting flanges (73) at the corresponding positions with bolts.

5. The low-pressure steel rolling steam recovery and utilization device according to claim 1, characterized in that, The scraper assembly (8) includes two sets of C-shaped scraper groups (81) symmetrically sleeved on the outside of the heat exchange tube (51). The C-shaped scraper group (81) includes a fixing buckle (811), a scraper (812) and a flow guide seat (813). The fixing buckles (811) of the two sets of C-shaped scraper groups (81) are fastened to each other by locking bolts. The scraper (812) is detachably connected to the lower end of the fixing buckle (811). The scraper (812) is inclined downward inward relative to the heat exchange tube (51). The flow guide seat (813) is detachably connected to the upper end of the fixing buckle (811). The upper surface of the flow guide seat (813) is inclined downward outward relative to the heat exchange tube (51).

6. The low-pressure steel rolling steam recovery and utilization device according to claim 5, characterized in that, The upper surface of the fixing buckle (811) is provided with a groove (8111), and the two ends of the fixing buckle (811) are fixedly connected with ear plates (8112) for installing locking bolts. The lower surface of the guide seat (813) is fixedly connected with a protrusion (814), and the protrusion (814) is inserted into the groove (8111) and the two are fixed by bolts.

7. A low-pressure steel rolling steam recovery and utilization device according to claim 5, characterized in that, The scraper (812) includes a fixing plate (8121) and a scraper (8122). The fixing plate (8121) is fixedly connected to the lower surface of the fixing buckle (811) by bolts. The scraper (8122) is fixedly connected to the lower surface of the scraper (812) with the scraping blade facing the heat exchange tube (51).

8. A low-pressure steel rolling steam recovery and utilization device according to claim 5, characterized in that, The drive assembly (9) includes an annular frame (91) for connecting multiple scraper assemblies (8) and a linear actuator (92) for driving the annular frame (91) to move vertically. The fixed end of the linear actuator (92) is fixedly connected to the upper end of the can lid (2) through a support frame (23). The telescopic end of the linear actuator (92) slides through the can lid (2) and extends into the interior of the can lid (2). The telescopic end of the linear actuator (92) is connected to the annular frame (91).

9. A low-pressure steel rolling steam recovery and utilization device according to claim 8, characterized in that, The annular frame (91) includes an outer ring seat (911) and a central disk (913) arranged coaxially. The outer ring seat (911) is arranged around the outside of the heat exchange assembly (5), and the central disk (913) is located at the center of the heat exchange assembly (5). The lower surface of the outer ring seat (911) is fixedly connected with an outer L-shaped bracket (912) at equal intervals along the circumference, the number of which is the same as the number of heat exchange tubes (51). The lateral end of each outer L-shaped bracket (912) is fixedly connected to one of the sets of fixing buckles (811) in a scraper assembly (8). The lower surface of the central disk (913) is fixedly connected with an inner L-shaped bracket (914) at equal intervals along the circumference, the number of which is the same as that of the heat exchange tubes (51). The lateral end of the inner L-shaped bracket (914) is fixedly connected to another set of fixing buckles (811) in the same scraper assembly (8). A column (915) is fixedly connected to the center of the upper surface of the central disk (913). A connecting flange four (916) is fixedly connected to the upper end of the column (915). The connecting flange four (916) is fixedly connected to the telescopic end of the linear actuator (92).

10. A low-pressure steel rolling steam recovery and utilization device according to claim 9, characterized in that, The linear actuator (92) employs a cylinder.

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