A silicon steel production waste gas waste heat recovery device

Abstract

The application discloses a silicon steel production waste gas waste heat recovery device, which comprises a first heat exchange chamber, a plurality of water spraying pipes and a uniform heat exchange mechanism, wherein the plurality of water spraying pipes are equidistantly distributed along the inner wall of the first heat exchange chamber and are connected with water inlet pipes on the first heat exchange chamber respectively. The silicon steel production waste gas waste heat recovery device provided by the application can make the wall of each heat exchange pipe be uniformly covered by water mist through the uniform heat exchange mechanism and the reciprocating rotation of the plurality of heat exchange pipes driven by the rotating heat exchange assembly, so that heat exchange dead angles are avoided, heat exchange is ensured to be sufficient, the waste heat recovery efficiency is effectively improved, the compound driving mechanism is synchronously operated through the pipe wall scraping assembly, the scale attached to the wall of the heat exchange pipe can be automatically scraped in the continuous operation process of the device, scale removal maintenance can be completed without stopping work, the scale is prevented from being attached to increase the heat exchange thermal resistance, and the stable heat exchange effect of the device is ensured.

Description

Technical Field

[0001] This application relates to the field of waste heat recovery technology, and in particular to a waste heat recovery device for silicon steel production exhaust gas. Background Technology

[0002] The continuous decarburization annealing furnace in silicon steel production emits a large amount of high-temperature flue gas during operation. This flue gas carries a considerable amount of heat energy. If it is directly vented into the atmosphere, it will cause a significant loss of heat and exacerbate energy consumption in production. To achieve efficient energy utilization and reduce production costs, it is usually necessary to recover the waste heat from this flue gas and reuse the heat in the high-temperature flue gas.

[0003] Existing steam-heat-exchange waste heat recovery devices generate steam by spraying water mist onto the outer wall of the flue pipe and then transport the generated steam to the production section requiring heat for heat recovery. However, in actual use, because the spray path of the water mist is fixed and the position of the heat exchange tube cannot be adjusted, heat exchange is often insufficient, and the waste heat recovery efficiency is generally low. At the same time, after long-term circulation, scale easily forms on the outer wall of the heat exchange tube, and the scale buildup further increases the thermal resistance of heat exchange, continuously affecting the heat exchange effect. Summary of the Invention

[0004] This application aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, one objective of this application is to provide a waste heat recovery device for silicon steel production exhaust gas. By setting a uniform heat exchange mechanism, the heat exchange between high-temperature exhaust gas and water mist is improved, and the scale adhering to the outer wall of the heat exchange tube can be automatically scraped off, thus solving the problems of insufficient heat exchange and scale affecting the heat exchange effect in the prior art.

[0006] To achieve the above objectives, this application proposes a waste heat recovery device for silicon steel production exhaust gas, comprising a first heat exchange chamber, multiple water spray pipes, and a uniform heat exchange mechanism. The multiple water spray pipes are equidistantly distributed along the inner wall of the first heat exchange chamber and are respectively connected to water inlet pipes on the first heat exchange chamber. The uniform heat exchange mechanism includes a rotating heat exchange component for high-temperature exhaust gas flow, a pipe wall scraping component, and a composite drive mechanism. The rotating heat exchange component is disposed within the first heat exchange chamber, and the spray nozzles of the multiple water spray pipes are respectively directed towards the rotating heat exchange component, and the water mist sprayed from the water spray pipes can cover the exhaust gas. The outer wall of the heat exchanger element inside the rotating heat exchange assembly is described. The pipe wall scraping assembly is sleeved on the outside of the rotating heat exchange assembly. The composite drive mechanism is disposed in the first heat exchange chamber and has two output ends. One output end of the composite drive mechanism is connected to the rotating heat exchange assembly and is used to drive the multiple heat exchanger elements inside the rotating heat exchange assembly to reciprocate. The other output end of the composite drive mechanism is connected to the pipe wall scraping assembly and is used to drive the pipe wall scraping assembly to circulate along the axial direction of the first heat exchange chamber in order to scrape off the scale adhering to the pipe wall of the heat exchanger element of the rotating heat exchange assembly.

[0007] In addition, the waste heat recovery device for silicon steel production exhaust gas proposed above in this application may also have the following additional technical features: In one embodiment of this application, the rotating heat exchange assembly includes a plurality of second heat exchange tubes, two distribution shrouds, and an inner toothed ring. The two distribution shrouds are respectively disposed on the inner top wall and inner bottom wall of the first heat exchange chamber. The plurality of second heat exchange tubes are equidistantly distributed around the axial direction of the first heat exchange chamber, and both ends of each second heat exchange tube are rotatably connected to the corresponding distribution shroud. The outer walls of the plurality of second heat exchange tubes are respectively provided with outer toothed rings. The inner toothed ring is rotatably disposed on one of the distribution shrouds, and the inner toothed ring is simultaneously engaged with the plurality of outer toothed rings.

[0008] In one embodiment of this application, a flue gas inlet pipe is provided at the bottom of the first heat exchange chamber, and a circulating flue gas pipe is provided at the top. The flue gas inlet pipe and the circulating flue gas pipe are respectively connected to the corresponding distribution hood, and the spray nozzles of the plurality of water spray pipes are respectively directed toward the corresponding second heat exchange pipe.

[0009] In one embodiment of this application, the pipe wall scraping assembly includes a lifting ring, a plurality of guide rods, and a limiting plate. The lifting ring is sleeved on the outside of a plurality of second heat exchange tubes, and the lifting ring is in contact with the outer wall of the corresponding second heat exchange tube through a scraping ring. The plurality of guide rods are symmetrically arranged on the inner wall of the first heat exchange chamber, and two limiting plates are symmetrically arranged on the lifting ring and slidably arranged on the outer wall of the corresponding guide rod.

[0010] In one embodiment of this application, the composite drive mechanism includes a reciprocating drive assembly, a circulating drive assembly, a drive fan, a drive rod, and a flow guide chamber connected to a circulating flue. The drive fan is located in the flow guide chamber and is connected to the drive rod. The drive rod is rotatably disposed in the flow guide chamber. One end of the drive rod away from the flow guide chamber is located in the first heat exchange chamber and is connected to the reciprocating drive assembly and the circulating drive assembly, respectively.

[0011] In one embodiment of this application, the reciprocating drive assembly includes a first bevel gear, a second bevel gear, a crankshaft, and a rocker arm. The crankshaft is rotatably disposed in the first heat exchange chamber and connected to the second bevel gear. The first bevel gear is disposed on the drive rod and meshes with the second bevel gear. One end of the rocker arm is rotatably connected to the crankshaft, and the other end is pivotally connected to the internal gear ring.

[0012] In one embodiment of this application, the circulating drive assembly includes a circulating belt, two synchronous pulleys, a connecting seat, and a connecting rod. The circulating belt is sleeved on the outside of the two synchronous pulleys. One of the synchronous pulleys is coaxially disposed on the end of the drive rod away from the drive fan. The other synchronous pulley is rotatably disposed on the inner wall of the first heat exchange chamber. The connecting seat is disposed on the outside of the circulating belt. One end of the connecting rod is pivotally connected to the connecting seat, and the other end is pivotally connected to the lifting ring.

[0013] In one embodiment of this application, a second heat exchange chamber is provided at the bottom of the first heat exchange chamber, and the first heat exchange chamber is connected to the second heat exchange chamber through a circulating water pipe. A first heat exchange tube is provided in the second heat exchange chamber, the air inlet of the first heat exchange tube is connected to the air outlet of the circulating flue, and the air outlet of the first heat exchange tube is connected to an exhaust pipe.

[0014] In one embodiment of this application, the inlet end of the flue is connected to a dust filter, the second heat exchange chamber is provided with a water supply pipe, and the first heat exchange chamber is provided with a steam recovery pipe.

[0015] Compared with the prior art, this application has at least the following beneficial effects: This application utilizes a uniform heat exchange mechanism that drives multiple heat exchange tubes to rotate reciprocally using rotating heat exchange components. This ensures that each heat exchange tube wall is evenly covered with water mist, avoiding heat exchange dead zones and guaranteeing sufficient heat exchange, effectively improving waste heat recovery efficiency. Simultaneously, the tube wall scraping component operates synchronously with the composite drive mechanism, automatically scraping away scale adhering to the heat exchange tube walls during continuous operation. This descaling maintenance can be completed without stopping operations, preventing scale buildup from increasing heat exchange resistance and ensuring stable heat exchange performance. Furthermore, by utilizing the kinetic energy of high-temperature flue gas flow as the driving force, no additional power components are required, and there is no additional energy consumption during device operation, further improving overall energy utilization efficiency. This makes it suitable for long-term continuous operation of high-temperature flue gas waste heat recovery in silicon steel production.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the overall structure of a waste heat recovery device for silicon steel production exhaust gas according to this application. Figure 2 This is a schematic diagram showing the installation position of the spray pipe of a waste heat recovery device for silicon steel production exhaust gas according to this application; Figure 3 This is a schematic diagram of the uniform heat exchange mechanism of a waste heat recovery device for silicon steel production exhaust gas according to this application. Figure 4 This is a schematic diagram of the rotating heat exchange component structure of a waste heat recovery device for silicon steel production exhaust gas according to this application; Figure 5 This is a schematic diagram of the pipe wall scraping component structure of a waste heat recovery device for silicon steel production exhaust gas according to this application; Figure 6 This is a schematic diagram of the circulating drive component structure of a waste heat recovery device for silicon steel production exhaust gas according to this application; Figure 7 This is a schematic diagram of the reciprocating drive component structure of a waste heat recovery device for silicon steel production exhaust gas according to this application. Figure 8 This is a schematic diagram of the first heat exchanger tube structure of a waste heat recovery device for silicon steel production exhaust gas according to this application.

[0018] As shown in the figure: 1. First heat exchange chamber; 11. Spray pipe; 12. Inlet pipe; 13. Steam recovery pipe; 14. Circulating water pipe; 2. Second heat exchange chamber; 21. First heat exchange tube; 22. Exhaust pipe; 23. Water supply pipe; 3. Rotary heat exchange assembly; 31. Inlet pipe; 32. Second heat exchange tube; 33. Distribution hood; 34. Outer gear ring; 35. Inner gear ring; 36. Circulating smoke pipe; 311. Dust filter; 4. Reciprocating drive assembly; 41. First bevel gear; 42. Second bevel gear; 43. Crankshaft; 44. Rocker arm; 5. Pipe wall scraping assembly; 51. Lifting ring; 52. Scraper ring; 53. Guide rod; 54. Limiting plate; 61. Drive fan; 62. Drive rod; 63. Flow chamber; 7. Circulating drive assembly; 71. Circulating belt; 72. Synchronous pulley; 73. Connecting seat; 74. Connecting rod. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0020] The following description, in conjunction with the accompanying drawings, describes a waste heat recovery device for silicon steel production exhaust gas according to an embodiment of this application.

[0021] This application provides a waste heat recovery device for silicon steel production exhaust gas, which can be applied to the waste heat recovery operation of high-temperature flue gas discharged from the continuous decarburization annealing furnace during silicon steel production. By recovering the heat energy carried by the flue gas in stages, energy utilization efficiency is improved and the energy consumption of enterprise production is reduced.

[0022] like Figures 1-8 As shown, this application discloses a waste heat recovery device for silicon steel production exhaust gas, including a first heat exchange chamber 1, multiple water spray pipes 11, and a uniform heat exchange mechanism. The multiple water spray pipes 11 are fixedly arranged at equal intervals along the inner wall of the first heat exchange chamber 1, and all water spray pipes 11 are connected to the water inlet pipe 12 on the first heat exchange chamber 1. The water inlet pipe 12 is connected to an external water supply unit (such as an industrial water pump) and can stably deliver heat exchange water to each water spray pipe 11. Atomized water droplets are sprayed from the water spray pipes 11 toward the rotating heat exchange component 3 for heat exchange.

[0023] The uniform heat exchange mechanism is installed inside the first heat exchange chamber 1, specifically including a rotating heat exchange component 3, a pipe wall scraping component 5, and a composite drive mechanism. The three work together to achieve the core functions of uniform heat exchange, automatic descaling, and energy-free linkage drive. Among them, the rotating heat exchange component 3 serves as the core structure for the primary heat exchange of high-temperature flue gas, used to circulate high-temperature silicon steel exhaust gas at 500℃-700℃. The spray nozzles of multiple water spray pipes 11 are precisely oriented towards the outer wall of the heat exchange component of the rotating heat exchange component 3, so that the sprayed water mist completely covers the outer surface of the heat exchange component, ensuring full coverage of the spray heat exchange.

[0024] The pipe wall scraping component 5 is sleeved on the outside of the rotating heat exchange component 3, and can move axially back and forth relative to the outer wall of the heat exchange component to realize online descaling operation.

[0025] The composite drive mechanism has two independent output power ends and adopts a single power source linkage drive mode, which eliminates the need for additional electrical control and power equipment, reducing the energy consumption of the device. One of its output ends is driven by the rotating heat exchange component 3, which can drive multiple sets of internal heat exchange components to rotate continuously, so that the heat exchange tube wall can be alternately contacted by water mist sprayed at various positions around the circumference. This solves the problems of uneven local heat exchange and many dead heat exchange corners in traditional fixed heat exchange structures, and improves the heat exchange rate between the tube wall and the water mist and the uniformity of waste heat recovery.

[0026] The other output end works in conjunction with the tube wall scraping component 5, which can drive the scraping component to move back and forth along the axis of the first heat exchange chamber 1, continuously scraping away the scale that has been precipitated on the outer wall of the heat exchanger due to long-term spray heat exchange. No downtime maintenance is required, the heat exchange tube wall is kept clean at all times, and the accumulation of scale can be avoided to increase the heat exchange thermal resistance, thus ensuring the long-term stable and efficient heat exchange performance of the device.

[0027] As the core heat exchange structure of this application, such as Figures 3-5 As shown, the rotating heat exchange assembly 3 includes multiple second heat exchange tubes 32, two distribution hoods 33, and an internal gear ring 35. The two distribution hoods 33 are respectively fixedly installed on the inner top wall and inner bottom wall of the first heat exchange chamber 1. The hollow interior of the distribution hood 33 forms a flue gas distribution chamber, which can evenly distribute the high-temperature exhaust gas entering the device, so that the flue gas flow rate inside the multiple second heat exchange tubes 32 tends to be consistent, avoiding the problems of single tube overload and overall heat exchange imbalance.

[0028] Multiple second heat exchange tubes 32 are arranged equidistantly around the first heat exchange chamber 1 along the axis. Both ends of each second heat exchange tube 32 are rotatably assembled with the corresponding distribution cover 33 through sealed bearings. The bearing positions are sealed and protected by a labyrinth seal structure to prevent high-temperature dusty flue gas from leaking outward from the assembly gap, thereby improving the sealing performance and operational safety of the device.

[0029] Each second heat exchange tube 32 is fixedly fitted with an outer gear ring 34 on its outer wall, and an inner gear ring 35 is rotatably mounted on the end face of the top distribution cover 33 through a sealed bearing. The inner gear ring 35 meshes synchronously with all the outer gear rings 34. Through the gear meshing transmission structure, the reciprocating swing of the inner gear ring 35 can synchronously drive all the second heat exchange tubes 32 to reciprocate synchronously, ensuring that the entire wall of each heat exchange tube can be in full contact with water mist, and achieving all-round uniform heat exchange.

[0030] In addition, the bottom of the first heat exchange chamber 1 is equipped with a flue gas inlet pipe 31 and the top is equipped with a circulating flue gas pipe 36. The flue gas inlet pipe 31 and the circulating flue gas pipe 36 are respectively connected to the upper and lower distribution hoods 33. The high-temperature flue gas enters the bottom distribution hood 33 through the flue gas inlet pipe 31 and is evenly distributed to the interior of each second heat exchange tube 32 to complete the first-stage heat exchange. The flue gas after heat exchange is collected in the top distribution hood 33 and finally transported to the next heat exchange process by the circulating flue gas pipe 36. At the same time, each water spray pipe 11 is arranged one-to-one with the corresponding second heat exchange tube 32 to eliminate spray blind spots and ensure the stability of heat exchange.

[0031] It should be noted that the high-temperature flue gas discharged from the continuous decarburization annealing furnace is stably maintained in the high-temperature range of 500℃-700℃. After the water mist comes into contact with the high-temperature second heat exchange tube 32, it can instantly absorb heat and vaporize to generate clean atmospheric pressure steam. The steam recovery pipe 13 is set at the top of the first heat exchange chamber 1, which can directly transport the generated steam to various heat-requiring sections of silicon steel production, realizing the recycling of waste heat resources, such as the degreasing and cleaning section of the continuous annealing unit, the humidification of the protective atmosphere pretreatment of the annealing furnace, and the heat tracing and insulation of the tank. It can directly replace the steam supplied by the coal-fired boiler or natural gas boiler in the existing production process.

[0032] like Figure 5 , Figure 6 As shown, the pipe wall scraping assembly 5 consists of a lifting ring 51, multiple guide rods 53, and a limiting plate 54. The lifting ring 51 is fitted onto the outside of all the second heat exchange tubes 32, and a scraping ring 52 made of high-temperature resistant nickel-based alloy is embedded on its inner side. The scraping ring 52 fits tightly against the outer wall of the second heat exchange tube 32, and has both high strength, wear resistance, and high temperature resistance. During axial movement, it can peel off the scale adhering to the pipe wall without causing wear damage to the heat exchange tube wall. Multiple guide rods 53 are symmetrically and vertically fixed to the inner wall of the first heat exchange chamber 1. The limiting plate 54 is symmetrically mounted on the outside of the lifting ring 51. The limiting plate 54 is slidably fitted onto the outside of the guide rods 53. Through the sliding limiting cooperation between the guide rods 53 and the limiting plate 54, the movement trajectory of the lifting ring 51 can be precisely constrained, ensuring that it always moves horizontally and smoothly, preventing the scraping ring 52 from deflecting or getting stuck, and ensuring the stability of continuous descaling operation.

[0033] like Figures 5 to 7As shown, the composite drive mechanism includes a reciprocating drive assembly 4, a circulating drive assembly 7, a drive fan 61, a drive rod 62, and a guide chamber 63. The guide chamber 63 is connected to the circulating flue 36. All the flue gas after heat exchange at the top flows through the guide chamber 63 and then into the circulating flue 36. The residual kinetic energy of the flue gas flow drives the drive fan 61 to rotate, achieving self-powered operation. The drive fan 61 is rotatably mounted inside the guide chamber 63. The central shaft of the drive fan 61 is fixedly connected to the top of the drive rod 62. The drive rod 62 extends laterally through the first heat exchange chamber 1 and is equipped with a sealed bearing. This ensures flexible rotation while preventing flue gas leakage (the flue gas in the continuous decarburization annealing furnace is under negative pressure. When the flow rate decreases, insufficient driving force may occur. To address this, an auxiliary drive motor can be added as a backup depending on the operating conditions, without affecting the core of this invention). The drive rod 62 extends into the heat exchange chamber and simultaneously links the reciprocating drive assembly 4 and the circulating drive assembly 7. It achieves single-source dual-drive by relying on the kinetic energy of flue gas, without the need for external power from the motor and without additional energy consumption, thus maximizing the energy recovery and utilization rate of the device.

[0034] Among them, the drive fan 61 is in direct contact with the high-temperature flue gas and can be made of high-temperature resistant and corrosion-resistant alloy material (such as cast heat-resistant steel) to ensure the structural stability of long-term operation in a high-temperature dusty flue gas environment.

[0035] like Figure 7 As shown, the reciprocating drive assembly 4 provides power for the reciprocating rotation of the heat exchange tubes, including a first bevel gear 41, a second bevel gear 42, a crankshaft 43, and a rocker arm 44. The first bevel gear 41 is coaxially fixed to the end of the drive rod 62, and the second bevel gear 42 is always meshed with the first bevel gear 41 for transmission. The bottom end of the crankshaft 43 is fixedly connected to the second bevel gear 42, and the top end is rotatably mounted inside the first heat exchange chamber 1. The crankshaft 43 is eccentrically hinged to one end of the rocker arm 44, and the other end of the rocker arm 44 is pivotally connected to the internal gear ring 35. When the drive rod 62 rotates, the bevel gears drive the crankshaft 43 to rotate a full circle, which in turn pushes and pulls the internal gear ring 35 to make reciprocating circumferential oscillations. Finally, the gear meshing drives all the second heat exchange tubes 32 to rotate synchronously, achieving uniform heat exchange throughout the entire area.

[0036] like Figure 6As shown, the circulating drive assembly 7 provides power for the movement of the tube wall scraping assembly 5, and includes a circulating belt 71, two synchronous pulleys 72, a connecting seat 73, and a connecting rod 74. The two sets of synchronous pulleys 72 are arranged vertically and parallel, with a toothed circulating belt 71 fitted on their outer sides. The toothed transmission prevents slippage and ensures accurate power transmission. One synchronous pulley 72 is coaxially fixed to the drive rod 62 and is directly driven to rotate by the drive rod 62. The other synchronous pulley 72 is rotatably mounted on the inner wall of the first heat exchange chamber 1. The connecting seat 73 is fixed to the outer side of the circulating belt 71, and the connecting seat 73 is pivotally hinged to the side wall of the lifting ring 51 via the connecting rod 74. When the drive rod 62 drives the synchronous pulleys 72 to rotate, the circulating belt 71 performs a closed-loop circulating motion. The connecting rod 74 continuously pushes and pulls the lifting ring 51 up and down along the guide rod 53, achieving uninterrupted online descaling and maintaining the cleanliness of the heat exchange tube wall. Furthermore, the pivotal connection of the connecting rod 74 prevents transmission jamming.

[0037] It should be noted that continuous descaling operations can prevent scale from continuously crystallizing and accumulating on the outer wall of the second heat exchange tube 32, thus maintaining a stable heat transfer coefficient.

[0038] Since the circulating belt 71 is located in the first heat exchange chamber 1, and the environment is a complex one with both water vapor and high temperature, it can be made of silicone rubber. Alternatively, as a possible alternative, the synchronous pulley 72 and the circulating belt 71 can be replaced with metal sprockets and chain drive structures when necessary, which can also achieve stable power transmission. This will only slightly increase the processing and manufacturing cost of the device. Those skilled in the art can flexibly choose the corresponding transmission scheme according to the actual production budget and working conditions, without changing the core drive logic.

[0039] like Figures 1 to 3 As shown, the first heat exchange chamber 1 is integrated with the second heat exchange chamber 2 at its bottom, forming a tiered waste heat recovery structure. The first heat exchange chamber 1 and the second heat exchange chamber 2 are connected by a circulating water pipe 14, and a Y-type impurity filter (not shown in the figure) is installed on the circulating water pipe 14 to intercept scale impurities generated during descaling, preventing impurities from entering the secondary heat exchange structure and causing pipe blockage. The first heat exchange tube 21 is fixedly arranged inside the second heat exchange chamber 2. The first heat exchange tube 21 adopts multiple sets of small-diameter branch pipes arranged in a serpentine bend to form a dense heat exchange tube bundle structure, increasing the contact heat exchange area with the water.

[0040] The inlet end of the first heat exchange tube 21 is sealed and connected to the circulating flue gas pipe 36. The flue gas, after being cooled by the first-stage heat exchange, still carries residual heat and can be introduced into the first heat exchange tube 21 to exchange heat with the cold water inside the second heat exchange chamber 2 for secondary heat exchange, achieving deep recovery of low-temperature waste heat. A hot water outlet pipe (equipped with a solenoid valve) is set at the bottom of the second heat exchange chamber 2. When the water temperature in the second heat exchange chamber 2 reaches the rated temperature, the hot water can be transported to the plant's domestic heating or production preheating section through the hot water outlet pipe, further tapping the potential for waste heat utilization and reducing the overall energy consumption in the silicon steel production process. This is a conventional utilization method well known to those skilled in the art and will not be elaborated further here.

[0041] In addition, a high-temperature resistant ceramic fiber filter 311 is installed at the air inlet end of the flue gas inlet pipe 31. This filter can intercept fine dust particles of iron oxide and silicon oxide in the high-temperature flue gas in advance, preventing dust from entering the heat exchange pipeline and causing blockage, thus extending the descaling and maintenance cycle of the device. A water supply pipe 23 is installed at the top of the second heat exchange chamber 2, which can automatically replenish cold water according to the water level changes in the second heat exchange chamber 2 to maintain stable heat exchange conditions. Through the two-stage heat exchange and self-generated steam reuse structure, the waste heat of silicon steel exhaust gas is maximized and efficiently recovered and utilized.

[0042] Specifically, the high-temperature flue gas discharged from the continuous decarburization annealing furnace in the silicon steel production process is first filtered by the dust filter 311 to remove large particulate dust impurities mixed in the flue gas. Then, it is sent into the distribution hood 33 at the bottom of the first heat exchange chamber 1 through the flue gas inlet pipe 31. After being distributed by the distribution hood 33, it is diverted into the inner cavity of each second heat exchange tube 32. The heat carried by the flue gas is transferred to the outside through the tube wall of the second heat exchange tube 32.

[0043] At this time, the water source is sent into each spray pipe 11 through the water inlet pipe 12. The spray pipe 11 sprays water mist evenly towards the outer wall of the second heat exchange pipe 32. After the water mist comes into contact with the high temperature pipe wall, it instantly vaporizes and absorbs heat to generate high temperature saturated steam. Finally, the steam is transported to the steam use section of the plant through the steam recovery pipe 13 on the first heat exchange chamber 1 to complete the first stage of waste heat recovery.

[0044] During flue gas flow, the flue gas flowing through the guide chamber 63 impacts the drive fan 61 inside the guide chamber 63, causing the drive fan 61 to rotate, which in turn drives the drive rod 62 to rotate synchronously. When the drive rod 62 rotates, it drives the crankshaft 43 to rotate through the meshing transmission of the first bevel gear 41 and the second bevel gear 42. The crankshaft 43 pulls the internal gear ring 35 to reciprocate circumferentially through the rocker arm 44. The internal gear ring 35 drives multiple second heat exchange tubes 32 to reciprocate and rotate synchronously through the inter-tooth meshing, so that the tube wall of each position of the second heat exchange tube 32 can fully contact the water mist, avoid insufficient local heat exchange, and improve heat exchange efficiency.

[0045] On the other hand, the drive rod 62 drives the synchronous wheel 72 to rotate, and the synchronous wheel 72 drives the circulation belt 71 to rotate a full circle. The connecting seat 73 on the outside of the circulation belt 71 moves synchronously with the circulation belt 71, and then pushes and pulls the lifting ring 51 through the connecting rod 74, causing the lifting ring 51 to move up and down along the guide rod 53. The scraping ring 52 on the inside of the lifting ring 51 continuously scrapes the outer wall of the second heat exchange tube 32, scraping off the scale that is attached to the tube wall, avoiding the scale from increasing the heat exchange thermal resistance, and ensuring the heat exchange effect is stable. After the scale falls off, it settles to the bottom of the first heat exchange chamber 1 and enters the circulation water pipe 14 with the falling water, where it is intercepted by the Y-type filter.

[0046] After the flue gas is cooled by the first stage of heat exchange, it flows out from the second heat exchange tube 32 and collects in the upper distribution hood 33. Then it is sent into the first heat exchange tube 21 in the second heat exchange chamber 2 through the circulating flue tube 36. At this time, there is still a lot of residual heat in the flue gas. The tube wall of the first heat exchange tube 21 exchanges heat with the cold water stored in the second heat exchange chamber 2 to heat the cold water and complete the second stage of waste heat recovery.

[0047] After undergoing two stages of heat exchange, the low-temperature exhaust gas flows out from the first heat exchange tube 21 and is then sent to the subsequent exhaust gas treatment process via the flue pipe 22 to meet emission standards.

[0048] In summary, the waste heat recovery device for silicon steel production exhaust gas according to this application embodiment, by setting a uniform heat exchange mechanism, uses a rotating heat exchange component to drive multiple heat exchange tubes to rotate back and forth, so that each heat exchange tube wall can be uniformly covered by water mist, avoiding heat exchange dead zones, ensuring sufficient heat exchange, and effectively improving waste heat recovery efficiency. At the same time, the tube wall scraping component operates synchronously with the composite drive mechanism, which can automatically scrape off the scale adhering to the heat exchange tube wall during continuous operation of the device, and can complete the descaling maintenance without stopping the operation, avoiding the increase of heat exchange thermal resistance due to scale buildup, and ensuring the stable heat exchange effect of the device. In addition, by using the kinetic energy of the high-temperature flue gas flow as the driving force, no additional power components are required, and no additional energy consumption is added to the operation of the device, further improving the overall energy utilization efficiency. It is suitable for long-term continuous operation of high-temperature flue gas waste heat recovery in silicon steel production.

[0049] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A waste heat recovery device for silicon steel production exhaust gas, characterized in that, It includes a first heat exchange chamber, multiple water spray pipes, and a uniform heat exchange mechanism, wherein, The plurality of water spray pipes are equidistantly distributed along the inner wall of the first heat exchange chamber and are respectively connected to the water inlet pipe on the first heat exchange chamber; The uniform heat exchange mechanism includes a rotating heat exchange component for high-temperature exhaust gas flow, a pipe wall scraping component, and a composite drive mechanism, wherein... The rotating heat exchange assembly is disposed in the first heat exchange chamber; The nozzles of the multiple water spray pipes are respectively directed toward the rotating heat exchange assembly, and the water mist sprayed from the water spray pipes can cover the outer wall of the heat exchange element inside the rotating heat exchange assembly. The pipe wall scraping assembly is sleeved on the outside of the rotating heat exchange assembly; The composite drive mechanism is disposed in the first heat exchange chamber and has two output ends. One output end of the composite drive mechanism is connected to the rotary heat exchange assembly and is used to drive multiple heat exchange elements in the rotary heat exchange assembly to rotate back and forth. The other output end of the composite drive mechanism is connected to the pipe wall scraping assembly, which is used to drive the pipe wall scraping assembly to move cyclically along the first heat exchange chamber to scrape off the scale adhering to the heat exchanger tube wall of the rotating heat exchange assembly.

2. The waste heat recovery device for silicon steel production exhaust gas according to claim 1, characterized in that, The rotating heat exchange assembly includes multiple second heat exchange tubes, two distribution shrouds, and an internal gear ring, wherein... The two distribution hoods are respectively disposed on the inner top wall and inner bottom wall of the first heat exchange chamber; Multiple second heat exchange tubes are equidistantly distributed around the axial direction of the first heat exchange chamber, and both ends of each second heat exchange tube are rotatably connected to the corresponding distribution cover. The outer walls of multiple second heat exchange tubes are respectively provided with external toothed rings; The internal gear ring is rotatably mounted on one of the distribution covers, and the internal gear ring is simultaneously engaged with multiple external gear rings.

3. The waste heat recovery device for silicon steel production exhaust gas according to claim 2, characterized in that, The first heat exchange chamber is provided with an inlet pipe at the bottom and a circulating smoke pipe at the top; The inlet pipe and the circulating pipe are respectively connected to the corresponding distribution hood; The nozzles of the plurality of water spray pipes are respectively directed toward the corresponding second heat exchange pipe.

4. The waste heat recovery device for silicon steel production exhaust gas according to claim 3, characterized in that, The pipe wall scraping assembly includes a lifting ring, multiple guide rods, and a limiting plate, wherein... The lifting ring is sleeved on the outside of multiple second heat exchange tubes, and the lifting ring is attached to the outer wall of the corresponding second heat exchange tube through a scraper ring; Multiple guide rods are symmetrically arranged on the inner wall of the first heat exchange chamber; The two limiting plates are symmetrically arranged on the lifting ring and slidably disposed on the outer wall of the corresponding guide rod.

5. The waste heat recovery device for silicon steel production exhaust gas according to claim 4, characterized in that, The composite drive mechanism includes a reciprocating drive assembly, a circulating drive assembly, a drive fan, a drive rod, and a guide chamber connected to the circulating smoke pipe, wherein... The drive fan is located in the flow guide chamber and is connected to the drive rod; The drive rod is rotatably mounted in the flow guide chamber; The end of the drive rod away from the flow guide chamber is located inside the first heat exchange chamber and is connected to the reciprocating drive assembly and the circulating drive assembly, respectively.

6. The waste heat recovery device for silicon steel production exhaust gas according to claim 5, characterized in that, The reciprocating drive assembly includes a first bevel gear, a second bevel gear, a crankshaft, and a rocker arm, wherein... The crankshaft is rotatably disposed in the first heat exchange chamber and is connected to the second bevel gear; The first bevel gear is mounted on the drive rod and meshes with the second bevel gear. One end of the rocker arm is rotatably connected to the crankshaft, and the other end is pivotally connected to the internal gear ring.

7. A waste heat recovery device for silicon steel production exhaust gas according to claim 6, characterized in that, The circulating drive assembly includes a circulating belt, two synchronous pulleys, a connecting seat, and a connecting rod, wherein... The circulation belt is sleeved on the outside of the two synchronous pulleys, one of which is coaxially disposed on the end of the drive rod away from the drive fan, and the other synchronous pulley is rotatably disposed on the inner wall of the first heat exchange chamber; The connecting seat is located on the outside of the circulating belt; One end of the connecting rod is pivotally connected to the connecting seat, and the other end is pivotally connected to the lifting ring.

8. The waste heat recovery device for silicon steel production exhaust gas according to claim 3, characterized in that, A second heat exchange chamber is provided at the bottom of the first heat exchange chamber, and the first heat exchange chamber is connected to the second heat exchange chamber through a circulating water pipe; The second heat exchange chamber is equipped with a first heat exchange tube; The inlet end of the first heat exchange tube is connected to the outlet of the circulating flue, and the outlet end of the first heat exchange tube is connected to an exhaust pipe.

9. A waste heat recovery device for silicon steel production exhaust gas according to claim 8, characterized in that, The air inlet end of the smoke inlet pipe is connected to a dust filter; A water supply pipe is installed on the second heat exchange chamber; A steam recovery pipe is installed on the first heat exchange chamber.

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