Submerged arc furnace flue gas heat recovery and dust interception integrated purification system

Abstract

The invention discloses a submerged arc furnace flue gas heat recovery and dust interception integrated purification system, and relates to the technical field of waste gas purification. The flue gas heat recovery and dust interception integrated purification system for the submerged arc furnace comprises a submerged arc furnace workshop and a cutting assembly used for cutting mineral wool, and further comprises a heat exchange device, the heat exchange device comprises a shell, and at least three sets of actively rotating hot gas conveying pipes are arranged in the shell in the axial direction; hot air generated by a submerged arc furnace workshop is introduced into the hot air conveying pipe, and dust waste gas generated by the cutting assembly is introduced between the shell and the hot air conveying pipe, so that the dust waste gas is dried by the hot air; the plate structure is located on the periphery of the hot air conveying pipe. The waste heat of the high-temperature waste gas is utilized to indirectly and continuously dry the high-humidity dust waste gas, so that the relative humidity of the dust waste gas and the surface moisture content of dust particles are remarkably reduced, and the bag pasting risk of a subsequent bag-type dust collector is greatly relieved.

Description

Technical Field

[0001] This invention relates to the field of waste gas purification technology, specifically to an integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace. Background Technology

[0002] During the production of mineral wool boards, a cutting process is required to meet different specifications. This process generates a large amount of dust and waste gas. If it is not effectively collected and purified, it will seriously pollute the workshop environment and endanger the health of workers. Currently, the common treatment method is to collect the dust through a gas collection hood and then directly introduce it into a bag filter for filtration. As a melting equipment in mineral wool production, the electric arc furnace generates a large amount of high-temperature waste gas during its operation. This waste gas usually needs to be cooled before it can enter the subsequent purification process or be directly discharged. It contains a large amount of waste heat that can be recycled.

[0003] However, due to the characteristics of its production process, mineral wool boards often contain a certain amount of residual moisture and incompletely cured adhesive, resulting in dust with high humidity and strong stickiness generated during cutting. When this high-humidity, high-stickiness dust enters the bag filter, it easily adheres to the surface of the filter bag fibers and is difficult to remove effectively by conventional pulse cleaning methods, thus quickly causing the filter bag to become clogged. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an integrated purification system for heat recovery and dust interception of flue gas from submerged arc furnaces, solving the problems mentioned in the background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace, comprising a submerged arc furnace working workshop and a cutting assembly for cutting mineral wool, and a heat exchange device. The heat exchange device includes: a shell, within which at least three sets of actively rotating hot gas conveying pipes are arranged axially, through which hot gas generated by the submerged arc furnace working workshop is introduced, and between the shell and the hot gas conveying pipes, dusty exhaust gas generated by the cutting assembly is introduced, so that the dusty exhaust gas is dried by the hot gas; a plate structure located around the hot gas conveying pipes; and an adjustment mechanism installed inside the shell, used to control the plate structure to rotate synchronously or asynchronously with the hot gas conveying pipes. When rotating synchronously, the plate structure acts as a heat-conducting plate and a baffle plate; when rotating asynchronously, it acts as a scraper to remove impurities around the hot gas conveying pipes.

[0006] Furthermore, the adjustment mechanism includes: a second partition, located in the area near both ends of the outer shell, dividing the interior of the outer shell into a central heat exchange space and two mechanical spaces at both ends, through which a hot gas conveying pipe passes; a carrier, rotatably mounted on the area of ​​the second partition opposite to the hot gas conveying pipe, with the hot gas conveying pipe mounted on the carrier; a keypad, fixed to both ends of the outer periphery of the hot gas conveying pipe; a movable seat, located in the area of ​​the outer periphery of the hot gas conveying pipe opposite to the carrier, with a spline on one side of the movable seat adapted to the keypad; and a guide rail, fixed to the carrier, with an insert plate slidably mounted inside the guide rail, one end of the insert plate extending to the outside of the guide rail and fixedly connected to the movable seat.

[0007] Furthermore, the adjustment mechanism also includes: a slot, disposed on a movable seat; a rotating shaft, rotatably mounted inside the housing, with a bushing disposed thereon; a rotating ring, the outer edge of which is fixed to the bushing, and the inner edge of which is embedded in the slot and slidably connected to the slot; and a track-changing structure, disposed at the connection between the rotating shaft and the bushing; the track-changing structure includes: an annular groove, two sets of annular grooves are disposed on the surface of the rotating shaft, and both sets of annular grooves are located within the coverage area of ​​the bushing; a track-changing groove, disposed on the rotating shaft, used to connect the two sets of annular grooves, with guide springs at both ends of the track-changing groove; and a guide slider, fixed to the inner side of the bushing and slidably connected to the annular groove and the track-changing groove.

[0008] Furthermore, the plate structure includes a base that can fit against the surface of the hot gas conveying pipe, a baffle plate on the other side of the base, and a scraper that is slidably arranged inside the base by two springs.

[0009] Both ends of the base are provided with wedge blocks, and a push rod is installed at the end of the insert plate away from the movable seat. When the insert plate slides away from the direction of the keyboard, the push rod pushes the base away from the hot air conveying pipe through the wedge blocks.

[0010] Furthermore, the carrier has a radially arranged sliding cavity for the wedge block to slide in, a radial guide rod is fixed in the sliding cavity, and a spring is sleeved on the radial guide rod.

[0011] Furthermore, it also includes the baffle plate, which has at least two sets; the baffle plate has a through hole through which the hot gas delivery pipe passes, and the area on the plate structure opposite to the through hole has a notch.

[0012] Furthermore, the transmission assembly includes: a first spur gear fixed to one end of the rotating shaft; and a second spur gear fixedly sleeved on the hot gas conveying pipe.

[0013] The driven wheel is rotatably mounted inside one end of the housing, with an external gear ring fixed on one side that meshes with the first spur gear, and an internal gear ring fixed on the inner side of the external gear ring that meshes with the second spur gear.

[0014] Furthermore, the transmission assembly also includes: a motor, fixed to the outside of the housing, with a drive pulley installed at its output end; a transmission belt, disposed between the drive pulley and the driven pulley; and through holes adapted to the transmission belt on the surface of the housing.

[0015] Furthermore, the mechanical space is also provided with a first partition, which is used to divide the mechanical space so that the end of the mechanical space near the end of the outer shell is the intake and exhaust space.

[0016] Furthermore, it also includes a second exhaust pipe, a bag filter, a chemical waste gas treatment tower, and a cutting assembly located on the mineral wool board conveyor line;

[0017] After heat exchange, the dry dust-containing gas is connected to the inlet of the bag filter through the second exhaust pipe.

[0018] After heat exchange, the gas in the hot gas delivery pipe is transported to the inlet of the chemical waste gas treatment tower through the first exhaust pipe.

[0019] The present invention has the following beneficial effects:

[0020] (1) The integrated purification system for heat recovery and dust interception of electric arc furnace flue gas indirectly dries the high-humidity dusty exhaust gas by utilizing the waste heat of high-temperature exhaust gas, which significantly reduces the relative humidity of the dusty exhaust gas and the surface moisture content of dust particles, thereby greatly alleviating the risk of bag clogging of the subsequent bag filter, ensuring its long-term, stable and efficient operation, and realizing the recovery and utilization of waste heat resources of electric arc furnace.

[0021] (2) The integrated purification system for heat recovery and dust interception of flue gas in the submerged arc furnace has two states for the plate structure. The first state is that the plate structure rotates synchronously with the hot gas conveying pipe. At this time, the plate structure acts as a heat-conducting plate and a turbulence plate. This means that the plate structure increases the outer surface area of ​​the hot gas conveying pipe and improves the heat exchange capacity of the hot gas conveying pipe, that is, it acts as a heat-conducting plate. The plate structure rotates together with the hot gas conveying pipe to turbulent the gas inside and outside, thereby enhancing the heat exchange effect. The second state is that the plate structure rotates asynchronously with the hot gas conveying pipe. That is, when the hot gas conveying pipe rotates, the plate structure can scrape off the impurities on the outside of the hot gas conveying pipe to ensure the long-term operation of the system.

[0022] (3) The integrated purification system for heat recovery and dust interception of flue gas in the submerged arc furnace has an expanded contact area between the baffle and the hot gas conveying pipe, thereby improving the heat exchange capacity of the baffle. In the stage of scraping impurities, the base no longer adheres to the hot gas conveying pipe, and only the scraper adheres to the hot gas conveying pipe, which greatly improves the ability to scrape impurities and avoids the situation where impurities repeatedly roll between the base and the hot gas conveying pipe caused by using the base to scrape impurities.

[0023] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0024] Figure 1 This is an overall diagram of the present invention;

[0025] Figure 2 This is an external view of the heat exchange device in this invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of the heat exchange device in this invention;

[0027] Figure 4 This is a front view of the assembly of the hot gas conveying pipe in this invention;

[0028] Figure 5 This is a schematic diagram of the plate structure being attached to the surface of the hot gas conveying pipe in this invention;

[0029] Figure 6 This is an assembly diagram of the keyboard in this invention;

[0030] Figure 7 This is an assembly diagram of the hot gas delivery pipe in this invention;

[0031] Figure 8 This is an assembly drawing of the external gear ring in this invention;

[0032] Figure 9 In this invention Figure 6 Enlarged view of area A;

[0033] Figure 10 This is a schematic diagram showing the position of the track-changing groove in this invention;

[0034] Figure 11 This is a diagram showing the arrangement of the first partition, the second partition, the third partition, and the baffle in this invention.

[0035] Figure 12 This is an assembly diagram of the hot gas conveying pipe of the present invention on the second partition plate;

[0036] Figure 13 For the present invention Figure 12 Enlarged view of area B;

[0037] Figure 14 This is an assembly diagram of the hot gas conveying pipe of the present invention on the baffle plate;

[0038] Figure 15 This is a schematic diagram of the driving component in this invention;

[0039] Figure 16 This is an external view of the plate structure in this invention;

[0040] Figure 17 This is a diagram showing the base detached from the hot gas delivery pipe in this invention.

[0041] Figure 18 This is a schematic diagram showing the position of the escape shield of the present invention.

[0042] In the diagram: 1. Mineral wool furnace workshop; 2. Mineral wool board conveyor line; 3. Outer shell; 4. First exhaust pipe; 5. Dust collection pipe; 6. Second exhaust pipe; 7. Bag filter; 8. Chemical waste gas treatment tower; 9. Truss; 10. Cutting machine; 11. Escape hood; 12. Coarse filter screen; 13. Slag discharge port; 14. Motor; 15. Drive wheel; 16. Transmission belt; 17. Driven wheel; 18. First partition; 19. Second partition; 20. Third partition; 22. Baffle plate; 23. Hot gas conveying pipe; 25. Plate structure; 251. Baffle plate. 252. Notch; 253. Base; 254. Scraper; 255. Spring II; 26. Shaft; 27. External gear ring; 28. Rotary ring; 29. ​​First spur gear; 30. Guide rail; 31. Moving seat; 32. Bushing; 33. Spline key; 34. Internal gear ring; 35. Second spur gear; 36. Groove; 37. Insert plate; 38. Spline; 39. Guide slider; 40. Annular groove; 41. Track changing groove; 42. Guide spring; 43. Push rod; 44. Wedge block; 45. Radial guide rod; 46. Spring I; 47. Carrier. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0045] The following is based on Figure 1 - Figure 18 This invention describes an integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace, provided by an embodiment of the present invention.

[0046] Please refer to Figure 1 The integrated purification system for heat recovery and dust interception of flue gas from the electric arc furnace includes an electric arc furnace workshop 1, a mineral wool board conveyor line 2, a second exhaust pipe 6, a bag filter 7, a chemical waste gas treatment tower 8, and a cutting assembly and heat exchange device installed on the mineral wool board conveyor line 2 for the formation of mineral wool boards.

[0047] The high-temperature exhaust gas generated in the working workshop 1 of the electric arc furnace and the dust exhaust gas generated on the cutting components are both fed into the heat exchange device. In the heat exchange device, the high-temperature exhaust gas dries the dust exhaust gas, reducing its humidity. The dried dust exhaust gas is the dry dust-containing gas. The dry dust-containing gas is connected to the air inlet of the bag filter 7 through the second exhaust pipe 6, thereby ensuring the dryness of the dust in the bag filter 7 and avoiding the situation where the dust is difficult to clean due to high humidity. After the high-temperature exhaust gas completes the heat exchange, its temperature decreases, and the low-temperature exhaust gas is transported into the chemical waste gas treatment tower 8 through the first exhaust pipe 4 for treatment.

[0048] Therefore, the integrated purification system for heat recovery and dust interception of ferroalloy furnace flue gas provided in this embodiment of the invention can recover the high-temperature waste gas generated in the ferroalloy furnace workshop 1 and use the high-temperature waste gas to dry the dust generated by the cutting components, thereby ensuring the dryness of the dust in the bag filter 7 and avoiding the situation where the dust is difficult to clean due to high humidity.

[0049] Preferably, a metal filter screen is used for pre-filtration of dusty exhaust gas before it enters the heat exchange device.

[0050] Combination Figures 2-5 As shown, the heat exchange device described above includes a housing 3, and at least three sets of actively rotating hot gas delivery pipes 23 are provided axially inside the housing 3 (see reference). Figure 14 There are three hot gas conveying pipes 23. The high-temperature exhaust gas generated by the working workshop 1 of the electric arc furnace is introduced into the hot gas conveying pipes 23. The dust exhaust gas generated by the cutting component is introduced between the outer shell 3 and the hot gas conveying pipes 23, so that the dust exhaust gas is dried by the hot gas. In summary, the high-temperature exhaust gas goes through the pipe side and the dust exhaust gas goes through the shell side. The high-temperature exhaust gas dries the dust exhaust gas through the heat exchange capacity of the metal material of the hot gas conveying pipes 23.

[0051] A plate structure 25 is also provided around the hot gas conveying pipe 23. The plate structure 25 has two states. In the first state, the plate structure 25 rotates synchronously with the hot gas conveying pipe 23. In this state, the plate structure 25 acts as a heat-conducting plate and a turbulence-disrupting plate. This means that the plate structure 25 increases the outer surface area of ​​the hot gas conveying pipe 23 and improves the heat exchange capacity of the hot gas conveying pipe 23, i.e., it acts as a heat-conducting plate. The plate structure 25 rotates together with the hot gas conveying pipe 23 to turbulent the gas inside and outside it, thereby enhancing the heat exchange effect, i.e., it acts as a turbulence-disrupting plate. In the second state, the plate structure 25 rotates asynchronously with the hot gas conveying pipe 23. That is, when the hot gas conveying pipe 23 rotates, the plate structure 25 can scrape off impurities around the hot gas conveying pipe 23. In this embodiment, an adjustment mechanism is provided. The adjustment mechanism is installed inside the outer shell 3 to control whether the plate structure 25 rotates synchronously or asynchronously with the hot gas conveying pipe 23.

[0052] like Figure 3 , Figure 4 and Figure 11 As shown, a second partition 19 is provided. The second partition 19 is located in the area near both ends of the outer shell 3 and divides the inner shell 3 into a central heat exchange space and two mechanical spaces at both ends. The hot gas conveying pipe 23 passes through the second partition 19. The central heat exchange space serves as the heat exchange site, that is, this section of the hot gas conveying pipe 23 is the effective heat exchange area.

[0053] A first partition 18 is also provided in the mechanical space. The first partition 18 is used to divide the mechanical space so that the end of the mechanical space near the end of the outer shell 3 is the intake and exhaust space. That is, the high temperature exhaust gas enters the outer shell 3 through the intake space, then enters the hot gas conveying pipe 23, and after being discharged from the hot gas conveying pipe 23, it reaches the other end of the outer shell 3 (i.e., the exhaust space), and then enters the first exhaust pipe 4.

[0054] Combination Figures 2-4 As shown, a dust collection pipe 5 is located at one end of the area opposite the outer shell 3 and the middle heat exchange space. The dust collection pipe 5 is connected to the cutting component area, and a second exhaust pipe 6 is provided at the other end. At least two sets of baffles 22 are provided in the heat exchange space to transport the dust exhaust gas into the shell side of the outer shell 3. After the dust exhaust gas is deflected by the baffles 22, it enters the second exhaust pipe 6.

[0055] Preferably, the baffle plate 22 is provided with a through hole through which the heating gas delivery pipe 23 passes, and a notch 252 is provided in the area opposite to the through hole on the plate structure 25 (e.g. Figure 16 ).

[0056] Specifically, the high-temperature exhaust gas generated in the blast furnace workshop 1 is connected to the hot gas conveying pipe 23 via a pipeline. The dust exhaust gas generated by the cutting components is connected to the outer shell 3 via a pipeline to exchange heat with the high-temperature exhaust gas, thereby reducing the humidity of the dust exhaust gas. It is then connected to the inlet of the bag filter 7 via the second exhaust pipe 6 to filter the dust exhaust gas. The outlet of the hot gas conveying pipe 23 is connected to the inlet of the chemical waste gas treatment tower 8 via the first exhaust pipe 4 to treat the high-temperature exhaust gas after heat exchange, thus avoiding environmental pollution from chemical waste gas. In this scheme, the baffle plate 22 is used to guide and agitate the dust exhaust gas. The hot air conveying pipe 23, which extends the residence path and time of dusty exhaust gas within the outer shell 3, serves as a circulation channel for high-temperature exhaust gas. The pipe is made of copper or aluminum alloy, and its wall becomes the main heat transfer surface for indirect heat exchange with the dusty exhaust gas. Through the cross-flow heat exchange configuration where dusty exhaust gas flows outside the hot air conveying pipe 23 and high-temperature exhaust gas flows inside the hot air conveying pipe 23, the waste heat energy generated in the working workshop 1 of the electric arc furnace can be efficiently utilized to actively dry the high-humidity dusty exhaust gas, reduce its relative humidity and the surface moisture content of dust particles, and alleviate the risk of bag clogging in the subsequent bag filter 7.

[0057] It should be noted that the cutting assembly provided in this embodiment includes a truss 9 fixed on the mineral wool board conveyor line 2. A track is provided on the truss 9, and a movable cutting machine 10 is installed on it. The cutting machine 10 moves to cut the mineral wool board. During this process, to prevent dust and exhaust gas from escaping, an escape shield 11 is installed on the mineral wool board conveyor line 2 at the position of the truss 9. A coarse filter 12 is installed near the upper end of the escape shield 11. The coarse filter 12 provides preliminary filtration of the dust and exhaust gas, and the filtered dust and exhaust gas is then transported to the interior of the outer casing 3 through a dust collection pipe 5. An exhaust fan is installed on the dust collection pipe 5 to improve the efficiency of dust and exhaust gas collection and transportation. (Refer to...) Figure 18 .

[0058] Combination Figure 3 , Figure 6 and Figure 7 As shown, the adjustment mechanism includes a carrier 47, a keypad 33, a movable seat 31, and a guide rail 30. The carrier 47 is rotatably mounted on the second partition 19 in the area opposite to the hot air conveying pipe 23. The hot air conveying pipe 23 is fixedly mounted on the carrier 47. The keypad 33 is fixed at both ends of the hot air conveying pipe 23. The movable seat 31 is located in the area of ​​the hot air conveying pipe 23 opposite to the carrier 47. A spline 38 adapted to the keypad 33 is provided on one side of the movable seat 31. The guide rail 30 is fixed on the carrier 47. An insert plate 37 is slidably mounted inside the guide rail 30. One end of the insert plate 37 extends to the outside of the guide rail 30 and is fixedly connected to the movable seat 31.

[0059] In this embodiment, the power transmission path is changed by engaging and disengaging the keypad 33 and the keypad 38. Specifically, during use, when the insert plate 37 slides toward the keypad 33, the keypad 38 engages with the keypad 33, causing the plate structure 25 to rotate synchronously with the hot gas delivery pipe 23. This rotation of the plate structure 25 enhances the turbulence effect inside the outer shell 3, further improving the heat exchange effect. When the insert plate 37 slides away from the keypad 33, the keypad 38 disengages from the keypad 33, and the plate structure 25 no longer rotates synchronously with the hot gas delivery pipe 23. This causes relative rotation between the plate structure 25 and the hot gas delivery pipe 23, thereby achieving the purpose of scraping away impurities from the outer wall of the hot gas delivery pipe 23.

[0060] Combination Figures 7-10 As shown, in order to achieve the left and right movement of the spline 38, the adjustment mechanism also includes a slot 36, a rotating shaft 26, a rotating ring 28, and a track-changing structure.

[0061] The groove 36 is provided on the movable seat 31, the rotating shaft 26 is rotatably installed in the outer shell 3, and the rotating shaft 26 is provided with a bushing 32. The outer edge of the rotating ring 28 is fixed on the bushing 32, and the inner edge of the rotating ring 28 is embedded in the groove 36 and slidably connected to the groove 36. The rotating ring 28 is driven to move by the bushing 32, so that the rotating ring 28 pushes the movable seat 31 to move through the groove 36. Preferably, a sliding guide port is provided on the outer side of the bushing 32, and a sliding track is provided on the inner wall of the outer shell 3 to slide in connection with the sliding guide port, so as to improve the stability of the bushing 32 when it moves. In addition, a track changing structure is provided at the connection between the rotating shaft 26 and the bushing 32, so that the bushing 32 slides along the rotating shaft 26, so that the rotating ring 28 drives the movable seat 31 to move.

[0062] In use, the rotation of the shaft 26 is converted into the axial sliding of the bushing 32 through the track-changing structure. The axial movement of the bushing 32 drives the rotating ring 28 fixed thereto to move together. The rotating ring 28 transmits the axial movement to the moving seat 31 through the slot 36 that is slidably connected to it, thereby driving the insert plate 37 to slide, and finally realizing the engagement and disengagement of the spline 38 and the spline keypad 33.

[0063] like Figure 9 and Figure 10 As shown, to achieve the change of sliding direction of the bushing 32, the variable track structure provided in this embodiment includes an annular groove 40. There are two sets of annular grooves 40, both of which are provided on the surface of the rotating shaft 26 and are located within the coverage area of ​​the bushing 32, so as to ensure that the bushing 32 can move between the two sets of annular grooves 40. A variable track groove 41 is provided on the rotating shaft 26 to connect the two sets of annular grooves 40. The angle between the orthographic projection of the variable track groove 41 on the horizontal plane and the side wall of the annular groove 40 is an acute angle. The guide slider 39 is fixed to the inner side of the bushing 32, and the guide slider 39 is slidably connected to the annular groove 40 and the variable track groove 41. Through the cooperation of the variable track groove 41 and the guide slider 39, the guide slider 39 drives the bushing 32 to move. By utilizing the sliding connection between the annular groove 40 and the guide slider 39, the rotation of the rotating shaft 26 will not affect the bushing. To prevent interference, the guide spring 42 provided in this embodiment is located at both ends of the track-changing groove 41. The guide spring 42 functions similarly to a "pawl," ensuring that the guide slider 39 can smoothly enter the track-changing groove 41 from the annular slide 40 and preventing the guide slider 39 from accidentally sliding into the track-changing groove 41 during the operation of the annular slide 40. Specifically, when the rotating shaft 26 rotates in the forward direction, the guide slider 39 is located in an annular slide 40 away from the spline 33, so that the spline 33 is separated from the spline 38. When the rotating shaft 26 rotates in the reverse direction, the guide slider 39 is located in an annular slide 40 close to the spline 33, so that the spline 33 is engaged with the spline 38. The forward or reverse rotation of the rotating shaft 26 determines the path direction of the guide slider 39 through the track-changing groove 41, thereby guiding it into different annular slides 40 and realizing automatic switching of working modes.

[0064] To ensure the stability of the engagement and disengagement of the keypad 33 and spline 38, the center distance between the two sets of annular grooves 40 provided in this embodiment is less than the maximum extension length of the insert plate 37. This ensures that when the guide slider 39 moves from one annular groove 40 to another under the drive of the track-changing structure, the axial travel provided is sufficient to drive the insert plate 37 to complete the entire sliding distance required for the engagement and disengagement of the keypad 33 and spline 38, thus avoiding jamming or incomplete engagement.

[0065] Combination Figure 8 , Figure 12 and Figure 13 As shown, in order to improve the thermal conductivity and impurity removal ability of the plate structure 25, the plate structure 25 includes a base 253, which can fit against the surface of the hot gas conveying pipe 23. A baffle 251 is provided on the other side of the base 253. A scraper 254 is slidably arranged inside the base 253 by a spring 255. Wedge blocks 44 are provided at both ends of the base 253. A push rod 43 is installed at the end of the insert plate 37 away from the moving seat 31. When the insert plate 37 slides away from the direction of the keyboard 33, the push rod 43 pushes the base 253 away from the hot gas conveying pipe 23 through the wedge block 44. Figure 17 (The state shown).

[0066] In this embodiment, the base 253 increases the contact area between the baffle 251 and the hot gas conveying pipe 23, thereby improving the heat exchange capacity of the baffle 251. Furthermore, during the impurity scraping stage, the base 253 no longer adheres to the hot gas conveying pipe 23, and only the scraper 254 adheres to the hot gas conveying pipe 23, which greatly improves the ability to scrape off impurities and avoids the situation where impurities repeatedly roll between the base 253 and the hot gas conveying pipe 23 when using the base 253 to scrape impurities.

[0067] Preferably, the carrier 47 has a radially arranged sliding cavity for the wedge block 44 to slide in, and a radial guide rod 45 is fixed in the sliding cavity. A spring 46 is sleeved on the radial guide rod 45 to ensure that when the wedge block 44 loses the thrust of the push rod 43, the carrier 47 can re-fit onto the surface of the hot gas conveying pipe 23.

[0068] Preferably, a slag discharge port 13 is provided in the area between two adjacent sets of baffles 22 at the lower end of the outer casing 3 for the output of dust after settling.

[0069] Combination Figure 3 , Figure 6 , Figure 9 and Figure 15 As shown, the integrated purification system for heat recovery and dust interception of electric arc furnace flue gas provided in this embodiment also includes a transmission component. The transmission component is used to control the rotation of the hot gas conveying pipe 23 and to adjust the heat exchange mechanism to be in heat exchange state or dust removal state.

[0070] The transmission assembly includes a first spur gear 29, a second spur gear 35, and a driven wheel 17. The first spur gear 29 is fixed to one end of the rotating shaft 26, the second spur gear 35 is fixedly sleeved on the hot gas conveying pipe 23, and the driven wheel 17 is rotatably mounted inside one end of the housing 3. An external gear ring 27 that meshes with the first spur gear 29 is fixed on one side of the driven wheel 17, and an internal gear ring 34 that meshes with the second spur gear 35 is fixed on the inner side of the external gear ring 27. The driven wheel 17 drives the external gear ring 27 and the internal gear ring 34. The engagement of the external gear ring 27 with the first spur gear 29 transmits power to the rotating shaft 26, driving it to rotate to control the clutch state. The engagement of the internal gear ring 34 with the second spur gear 35 transmits power to the hot gas conveying pipe 23, driving it to rotate, thereby improving the heat exchange effect and coordinating with the movement of the plate structure 25 to accelerate turbulence or clean the pipe wall.

[0071] To drive the driven wheel 17, the transmission assembly provided in this embodiment also includes a motor 14 and a transmission belt 16. The motor 14 is fixed to the outside of the housing 3, and a drive wheel 15 is installed at its output end. The transmission belt 16 is located between the drive wheel 15 and the driven wheel 17. The motor 14 drives the drive wheel 15 to rotate, and the transmission belt 16 causes the driven wheel 17 to rotate accordingly, thereby driving the driven wheel 17. To facilitate the movement of the transmission belt 16, a through hole adapted to the transmission belt 16 is provided on the surface of the housing 3.

[0072] To improve the airtightness of the housing 3 and reduce the impact of dust on the transmission effect, each gear is located in the space between the second partition 19 and the first partition 18. The driven wheel 17 is provided with a third partition 20 fixedly connected to the inner wall of the housing 3 on the side away from the first partition 18. One end of the hot air conveying pipe 23 passes through the third partition 20. Through the first partition 18, the second partition 19 and the third partition 20, the functional zoning and sealing isolation inside the housing 3 are realized. The first partition 18 and the second partition 19 form a relatively closed chamber to accommodate part of the adjustment mechanism and part of the transmission components, isolating them from dust and exhaust gas, preventing dust pollution, and improving their working reliability and lifespan. The third partition 20 further separates the driven wheel 17 from the inlet and outlet of the hot air conveying pipe 23, which is conducive to the diversion of multiple hot air conveying pipes 23. Rotary seals are also required where the hot air conveying pipe 23 passes through the first partition 18, the second partition 19 and the third partition 20 to maintain the airtightness between the chambers and ensure that the dust and exhaust gas can only flow along the designed flow path.

[0073] During operation, the high-temperature exhaust gas generated in the working workshop 1 of the electric arc furnace is directed to the input end of the hot gas conveying pipe 23. The high-temperature exhaust gas flows within the hot gas conveying pipe 23, and its heat energy is continuously conducted outwards through the pipe wall. Simultaneously, the mineral wool board is cut by the cutting machine 10 on the mineral wool board conveying line 2. The resulting dust exhaust gas is collected by the escape hood 11, and after the coarse filter 12 initially intercepts large particles, it is conveyed to the air inlet end of the outer shell 3 through the dust collection pipe 5. After entering the outer shell 3, the dust exhaust gas is guided by the baffle 22, ensuring full contact between the dust exhaust gas and the outer surface of the hot gas conveying pipe 23. The heat from the high-temperature exhaust gas inside the cavity radiates through the pipe wall, drying the dusty exhaust gas and reducing its humidity. During this process, some of the heavier and wetter dust particles in the exhaust gas settle due to inertial impact on the baffle plate 22 or the hot gas conveying pipe 23, and can be periodically discharged through the slag discharge port 13 to achieve primary interception. The dusty exhaust gas, after initial drying and dust reduction, finally enters the bag filter 7 through the second exhaust pipe 6 for fine filtration. On the other hand, the high-temperature exhaust gas, after heat exchange and temperature reduction, is introduced from the output end of the hot gas conveying pipe 23 through the first exhaust pipe 4 into the chemical exhaust gas treatment tower 8 for purification treatment, and is discharged after meeting the standards.

[0074] During the heat exchange stage, the control motor 14 reverses, driving the driven wheel 17 and the connected outer gear ring 27 and inner gear ring 34 to rotate in the opposite direction. The outer gear ring 27 drives the first spur gear 29 to rotate the rotating shaft 26 in the opposite direction. The reverse rotation of the rotating shaft 26 causes the guide slider 39 to move from the original annular slide groove 40 through the changing track groove 41 to the other side of the annular slide groove 40 near the spline 33. It is further transmitted through the bushing 32, rotating ring 28, and slot 36, pushing the moving seat 31 and the insert plate 37 to slide towards the spline 33 until the spline 38 and the spline 33 are fully engaged. At this time, the rotation of the hot air conveying pipe 23 is synchronously transmitted to the plate structure 25 through the spline 38, and the two lock and rotate synchronously.

[0075] When a decrease in heat exchange efficiency is detected or the predetermined dust removal cycle is reached, dust removal is required. The control motor 14 rotates forward, driving the driven wheel 17 to rotate forward via the drive wheel 15 and transmission belt 16. The driven wheel 17 drives the fixed external gear ring 27 and internal gear ring 34 to rotate synchronously. The external gear ring 27 drives the first spur gear 29, thereby driving the rotating shaft 26 to rotate forward. The internal gear ring 34 drives the second spur gear 35, thereby driving the hot gas conveying pipe 23 to rotate. Simultaneously, the forward rotation of the rotating shaft 26 acts on the track-changing structure, causing the guide slider 39, fixed inside the bushing 32, to move along the track-changing groove 41 under the action of forward rotation and the guidance of the guide spring 42. Entering the annular groove 40 on the side away from the keypad 33, the bushing 32 drives the rotating ring 28 to produce axial displacement. The rotating ring 28 pushes the moving seat 31 and the insert plate 37 to slide away from the keypad 33 through the slot 36, so that the spline 38 on the moving seat 31 is completely separated from the keypad 33 fixed on the hot air conveying pipe 23. At this time, the power is only transmitted to the hot air conveying pipe 23 through the internal gear ring 34 and the second spur gear 35, causing it to rotate. The plate structure 25 is constrained by the guide rail 30 and cannot rotate with the hot air conveying pipe 23, so that the plate structure 25 and the hot air conveying pipe 23 rotate relative to each other, which can achieve the cleaning of the outer wall of the hot air conveying pipe 23.

[0076] As the spline 38 moves away from the spline keyboard 33, when the insert plate 37 slides away from the spline keyboard 33, the push rod 43 pushes the base 253 through the wedge block 44 to no longer adhere to the hot air delivery pipe 23. Only the scraper 254 adheres to the hot air delivery pipe 23, which greatly improves the ability to scrape off impurities and avoids the situation where impurities repeatedly roll between the base 253 and the hot air delivery pipe 23 due to scraping impurities with the base 253.

[0077] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0078] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace, comprising a submerged arc furnace working workshop (1) and a cutting assembly for cutting mineral wool, characterized in that, It also includes a heat exchange device, which comprises: The outer shell (3) has at least three sets of actively rotating hot gas conveying pipes (23) arranged along the axial direction. The hot gas generated by the working workshop (1) of the electric arc furnace is introduced into the hot gas conveying pipes (23). The dust exhaust gas generated by the cutting component is introduced between the outer shell (3) and the hot gas conveying pipes (23) so that the dust exhaust gas is dried by the hot gas. Plate structure (25), the plate structure being located around the hot gas conveying pipe (23); The adjustment mechanism is installed inside the outer shell (3) and is used to control the plate structure and the hot gas conveying pipe (23) to rotate synchronously or asynchronously. When rotating synchronously, the plate structure (25) acts as a heat-conducting plate and a baffle plate. When rotating asynchronously, it acts as a scraper to scrape off impurities around the hot gas conveying pipe (23).

2. The integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace according to claim 1, characterized in that, The adjustment mechanism includes: The second partition (19) is located in the area near both ends of the outer shell (3) and divides the interior of the outer shell (3) into a central heat exchange space and two mechanical spaces at both ends. The hot gas delivery pipe (23) passes through the second partition (19). The carrier (47) is rotatably mounted on the second partition (19) in the area opposite to the hot gas delivery pipe (23), which is mounted on the carrier (47); The keypad (33) is fixed to both ends of the hot air delivery pipe (23); The movable seat (31) is located in the area outside the hot gas conveying pipe (23) opposite to the carrier (47). A spline (38) adapted to the spline keyboard (33) is provided on one side of the movable seat (31). The guide rail (30) is fixed on the carrier (47). A plate (37) is slidably installed inside the guide rail (30). One end of the plate (37) extends to the outside of the guide rail (30) and is fixedly connected to the movable seat (31).

3. The integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace according to claim 2, characterized in that, The adjustment mechanism also includes: The slot (36) is located on the movable base (31); A rotating shaft (26) is rotatably installed inside the housing (3), and a bushing (32) is provided on it. The outer edge of the rotating ring (28) is fixed to the bushing (32), and its inner edge is embedded in the groove (36) and slidably connected to the groove (36); The track-changing structure is located at the connection between the rotating shaft (26) and the bushing (32); The trajectory-changing structure includes: Annular groove (40), both sets of annular grooves (40) are provided on the surface of the rotating shaft (26), and both sets of annular grooves (40) are located within the coverage area of ​​the bushing (32); A track-changing groove (41) is provided on the rotating shaft (26) for connecting two sets of annular sliding grooves (40). Guide springs (42) are provided at both ends of the track-changing groove (41). The guide slider (39) is fixed inside the bushing (32) and is slidably connected to the annular groove (40) and the track changing groove (41).

4. The integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace according to claim 2, characterized in that, The plate structure (25) includes a base (253), which can fit against the surface of the hot gas conveying pipe (23). A baffle (251) is provided on the other side of the base (253), and a scraper (254) is slidably provided inside the base (253) by a spring (255). Both ends of the base (253) are provided with wedge blocks (44), and the end of the insert plate (37) away from the moving seat (31) is equipped with a push rod (43). When the insert plate (37) slides away from the direction of the keyboard (33), the push rod (43) pushes the base (253) no longer to fit the hot air conveying pipe (23) through the wedge block (44).

5. The integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace according to claim 4, characterized in that, The carrier (47) is provided with a sliding cavity along the radial direction for the wedge block (44) to slide. A radial guide rod (45) is fixed in the sliding cavity, and a spring (46) is sleeved on the radial guide rod (45).

6. The integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace according to claim 2, characterized in that, It also includes baffles (22), which are provided in at least two sets; The baffle plate (22) is provided with a through hole through which the heating gas delivery pipe (23) passes, and a notch (252) is provided in the area opposite to the through hole on the plate structure (25).

7. The integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace according to any one of claims 3-6, characterized in that, It also includes a transmission assembly, which comprises: The first spur gear (29) is fixed to one end of the rotating shaft (26); The second spur gear (35) is fixedly sleeved on the hot gas conveying pipe (23); Driven wheel (17) is rotatably mounted inside one end of housing (3), and an external gear ring (27) that meshes with the first spur gear (29) is fixed on one side of the external gear ring (27), and an internal gear ring (34) that meshes with the second spur gear (35) is fixed on the inner side of the external gear ring (27).

8. The integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace according to claim 7, characterized in that, The transmission assembly also includes: The motor (14) is fixed to the outside of the housing (3), and its output end is equipped with a drive wheel (15). A drive belt (16) is located between the driving pulley (15) and the driven pulley (17); The outer shell (3) has through holes on its surface that are adapted to the transmission belt (16).

9. The integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace according to claim 8, characterized in that, The mechanical space is also provided with a first partition (18), which is used to separate the mechanical space so that the end of the mechanical space near the end of the outer shell (3) is the intake and exhaust space.

10. The integrated purification system for heat recovery and dust interception of flue gas from a submerged arc furnace according to claim 1, characterized in that, It also includes a second exhaust pipe (6), a bag filter (7), a chemical waste gas treatment tower (8), and the cutting assembly is located on the mineral wool board conveyor line (2); After heat exchange, the dry dust-containing gas is connected to the inlet of the bag filter (7) through the second exhaust pipe (6); After heat exchange, the gas in the hot gas conveying pipe (23) is transported to the inlet of the chemical waste gas treatment tower (8) through the first exhaust pipe (4).

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