A tail gas waste heat recycling device for regenerating a carbon black drying section

Abstract

The present application belongs to the technical field of regenerated carbon black production equipment, and particularly relates to a tail gas waste heat recycling device for a drying section of regenerated carbon black, comprising a drying mechanism, a hot air conveying mechanism, a waste heat recovery mechanism and a dust filtering mechanism; the drying mechanism comprises a roller, the inside of the roller is provided with spiral blades, one end of the roller is provided with a hopper, one side is provided with the hot air conveying mechanism, the discharge end is provided with the waste heat recovery mechanism, the inside of the waste heat recovery mechanism is provided with the dust filtering mechanism, and the waste heat recovery mechanism is connected with a return air pipe, a shunt pipe and a butt joint pipe. After the tail gas after drying is collected and filtered, the raw materials in the hopper are preheated and sent back to the air inlet side of the hot air conveying mechanism to realize recycling. The present application can improve the utilization rate of tail gas heat in the drying section.

Description

Technical Field

[0001] This invention belongs to the field of recycled carbon black technology, specifically relating to a waste heat recycling device for the exhaust gas in the drying process of recycled carbon black. Background Technology

[0002] In the production process of recycled carbon black, a drying section is typically required to remove moisture from the material to meet subsequent storage, transportation, or usage requirements. Current recycled carbon black drying operations generally involve supplying hot air into the drying equipment, allowing the material to come into contact with the hot air during agitation or conveying, thereby achieving moisture evaporation and material drying. During this process, the hot air will generate exhaust gas with a certain temperature after drying, and this exhaust gas usually still contains usable heat. Therefore, its treatment directly affects the energy consumption level and heat utilization efficiency of the drying section.

[0003] However, in the existing recycled carbon black drying section, the exhaust gas discharged after drying is often not effectively recovered and recycled at the system level, resulting in the direct emission or inefficient disposal of the heat carried in the exhaust gas. This leads to low overall thermal energy utilization rate of the drying section, increased energy consumption, and difficulty in meeting the energy-saving and consumption-reducing requirements in the continuous production of recycled carbon black. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide a waste heat recycling device for the exhaust gas of the carbon black drying process, which can achieve (beneficial effects).

[0005] To achieve the above objectives, the present invention provides the following technical solution: A waste heat recycling device for exhaust gas in a carbon black drying process includes a drying mechanism. The drying mechanism includes a drum with spiral blades inside. A hopper is located at one end of the drum, and a hot air conveying mechanism is located on one side of the drum to convey heated airflow into the drum for drying the raw materials. A waste heat recovery mechanism is located at the discharge end of the drum, and a dust filtration mechanism is located inside the waste heat recovery mechanism to collect the exhaust gas discharged from the drum and to filter dust in the exhaust gas. The waste heat recovery mechanism is connected to a return air duct, and the end of the return air duct is divided into multiple branch pipes that penetrate the hopper. The ends of the multiple branch pipes away from the return air duct are all connected to a connecting pipe. The connecting pipe is connected to the side of the hot air conveying mechanism near the air inlet, so that the filtered exhaust gas preheats the raw materials in the hopper before being sent back to the hot air conveying mechanism, thereby realizing the recycling of waste heat from the exhaust gas.

[0006] Furthermore, the drying mechanism also includes a support frame, a drive mechanism, a discharge end cover, and a feed end cover. The roller is rotatably mounted on the top of the support frame. The roller is hollow inside and open at both ends. The discharge end cover and the feed end cover are respectively disposed at both ends of the roller. The drive mechanism is disposed on the lower inner side of the support frame and is used to drive the roller to rotate. The hopper is fixed to the top of the feed end cover.

[0007] Furthermore, the hot air conveying mechanism includes a hot air box, an air collecting hood, and an air supply duct. The hot air box is fixed to the outer end face of the feed end cover, the air collecting hood is fixed to the inner side of the hot air box, and the air supply duct is located at the end of the air collecting hood and extends through the feed end cover into the roller. The surface of the air supply duct is evenly provided with air outlet holes.

[0008] Furthermore, the waste heat recovery mechanism includes a collection hood and a filter box. The collection hood is fixed to the center of the surface of the discharge end cover, and the opening of the collection hood is in communication with the inside of the drum. The filter box is fixed to the outside of the collection hood, and the return air pipe is connected to the upper side of one side of the filter box.

[0009] Furthermore, the collection hood is trumpet-shaped, and a cross-shaped perforated frame is provided on the inner side of the collection hood. The end of the air supply duct opposite to the air collection hood is fixed to the cross-shaped perforated frame. A sealing cover is installed on the top of the filter box, and a C-shaped opening is provided on the lower side of the filter box opposite to the collection hood. A support plate is fixed inside the lower part of the filter box.

[0010] Furthermore, the dust filtration mechanism includes a filter cartridge, which is rotatably installed inside the filter box. The filter cartridge is hollow inside and open at the top. The bottom of the filter cartridge is rotatably installed on a support plate. A sealing ring is provided outward at the open top of the filter cartridge. The sealing ring is adapted to the inner wall of the filter box. A sealing protrusion is symmetrically provided on the outer surface of the filter cartridge. The outer side of the sealing protrusion abuts against the inner wall of the filter box. A filter cloth is laid on the surface of the filter cartridge.

[0011] Furthermore, a partition plate is fixed inside the filter cartridge, which divides the internal space of the filter cartridge. Movable plates are hinged to both sides of the top of the partition plate, and the movable plates are used to cover the openings on both sides of the top of the filter cartridge.

[0012] Furthermore, a convex ring is fixed at the bottom center of the support plate, and positioning grooves are symmetrically formed on the lower surface of the convex ring. A fixing post is set at the bottom center of the filter cartridge, and the fixing post passes through the convex ring. Track grooves are symmetrically formed along the axial direction on the surface of the fixing post. An end cap is threadedly connected to the bottom of the fixing post. A slider is slidably installed inside the fixing post. Positioning rods are set at both ends of the slider, and the positioning rods pass through the corresponding track grooves. A pull rod is set at the bottom of the slider, and the pull rod passes through the end cap. A spring is sleeved on the surface of the pull rod, and the spring is located inside the fixing post and between the slider and the end cap.

[0013] Furthermore, a C-shaped opening is provided on the side of the filter box away from the collection cover. An arc-shaped cover is slidably installed inside the C-shaped opening. A gap is left between the arc-shaped cover and the support plate inside the filter box. A dust collection box is provided inside the lower part of the arc-shaped cover.

[0014] Compared with the prior art, the beneficial effects of the present invention are: Compared with existing technologies, this invention addresses the problem that the exhaust gas discharged after drying in the recycled carbon black drying section cannot be effectively recovered and recycled at the system level, resulting in the direct emission or inefficient disposal of the heat carried by the exhaust gas, and thus causing low overall thermal energy utilization of the drying section. It adopts an exhaust gas waste heat recycling scheme consisting of a drying mechanism, a hot air conveying mechanism, a waste heat recovery mechanism, and a dust filtration mechanism. During the drying process of the raw material in the drum, the exhaust gas generated after drying is collected centrally by a collection structure on one side of the discharge end, and then enters the filtration space for dust filtration. The filtered exhaust gas is then conveyed to the hopper area via a return air path to preheat the raw material to be entered into the drum, and then returned to the hot air conveying section near the air inlet for reheating and air supply. This integrates the heat from the originally directly discharged exhaust gas back into the heat utilization process of the drying section, enabling continuous recovery and reuse of the exhaust gas waste heat within the same drying system, thereby improving the overall thermal energy utilization of the drying section and reducing energy waste caused by the direct loss of exhaust gas heat. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 For the present invention Figure 2 Cross-sectional structural diagram; Figure 4 This is a three-dimensional structural diagram of the waste heat recovery mechanism of the present invention; Figure 5 This is a three-dimensional structural diagram of the hot air conveying mechanism of the present invention; Figure 6 This is a schematic diagram of the internal structure of the filter box of the present invention in cross-section; Figure 7 This is a three-dimensional structural diagram of the filter box of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the arc-shaped cover of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the filter cartridge of the present invention; Figure 10 This is a three-dimensional cross-sectional view of the fixed column structure of the present invention.

[0016] The attached diagram lists the components represented by each number as follows: 1. Drying mechanism; 11. Support frame; 12. Drum; 121. Spiral blades; 13. Drive mechanism; 14. Discharge end cover; 15. Feed end cover; 16. Hopper; 2. Hot air conveying mechanism; 21. Hot air box; 22. Air collector hood; 23. Air supply duct; 24. Air outlet; 3. Waste heat recovery mechanism; 31. Collection hood; 32. Cross-shaped hollow frame; 33. Filter box; 34. Sealing cover; 35. C-shaped opening; 36. Support plate; 37. Protruding ring; 371. Positioning groove; 38. Return air duct; 39. Diversion pipe; 310. Connecting pipe; 4. Dust filtration mechanism; 41. Filter cartridge; 42. Sealing ring; 43. Sealing strip; 44. Isolation plate; 45. Movable plate; 46. Fixed column; 47. Track groove; 48. End cap; 49. Sliding block; 491. Positioning rod; 410. Pull rod; 411. Spring; 412. Arc-shaped cover; 413. Dust collection box. Detailed Implementation

[0017] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention. Example

[0018] See Figures 1 to 7 A waste heat recycling device for the drying section of recycled carbon black includes a drying mechanism 1, a hot air conveying mechanism 2, a waste heat recovery mechanism 3, and a dust filtration mechanism 4. The drying mechanism 1 includes a support frame 11, on which a drum 12 is rotatably mounted. The drum 12 is hollow inside and open at both ends, and a spiral blade 121 is provided inside the drum 12. A discharge end cover 14 is provided at one end of the support frame 11, and a feed end cover 15 is provided at the other end of the support frame 11. The discharge end cover 14 and the feed end cover 15 are located at the two ends of the drum 12, respectively. The drum 12 is installed between the discharge end cover 14 and the feed end cover 15 and can rotate relative to the support frame 11. A drive mechanism 13 is provided on the lower inner side of the support frame 11, which is used to drive the drum 12 to rotate. A hopper 16 is fixed on the top of the feed end cover 15. The hopper 16 is connected to the feed end of the drum 12 and is used to add the recycled carbon black raw material to be dried into the drum 12.

[0019] See Figure 1 , Figure 2 , Figure 5The hot air conveying mechanism 2 is located on one side of the drum 12. The hot air conveying mechanism 2 includes a hot air box 21 fixed to the outer end face of the feed end cover 15. An air collecting hood 22 is fixed inside the hot air box 21. An air supply duct 23 is provided at the end of the air collecting hood 22. The air supply duct 23 passes through the feed end cover 15 and extends into the drum 12. Air outlet holes 24 are evenly opened on the surface of the air supply duct 23. The hot air conveying mechanism 2 is arranged in conjunction with the drum 12. The air supply duct 23 extends along the axial direction of the drum 12. The air outlet holes 24 are distributed facing the internal space of the drum 12 to convey the heated airflow output from the hot air box 21 into the inside of the drum 12. This solves the problem of the application scenario where a continuous supply of hot airflow is required during the drying process of recycled carbon black, but a lot of heat remains in the exhaust gas.

[0020] See Figures 1 to 7 The waste heat recovery mechanism 3 is located at the discharge end of the drum 12. The waste heat recovery mechanism 3 includes a collection hood 31 fixed to the center of the surface of the discharge end cover 14. The opening of the collection hood 31 communicates with the interior of the drum 12. A filter box 33 is fixed to the outside of the collection hood 31. A return air pipe 38 is connected to the upper side of one side of the filter box 33. The end of the return air pipe 38 is divided into multiple branch pipes 39. The multiple branch pipes 39 horizontally penetrate the hopper 16. The ends of the multiple branch pipes 39 away from the return air pipe 38 are all connected to a connecting pipe 310. The connecting pipe 310 is connected to the side of the hot air box 21 near the air inlet. The dust filtration mechanism 4 is installed inside the filter box 33 to filter dust in the exhaust gas. The filtered exhaust gas enters the branch pipes 39 through the return air pipe 38, preheats the raw materials inside the hopper 16, and then is returned to the hot air box 21 through the connecting pipe 310, thus forming a recycling path for the heat of the exhaust gas within the drying section.

[0021] See Figures 1 to 7 During use, recycled carbon black raw material is added through hopper 16 and enters the drum 12 through feed end cover 15. After the drive mechanism 13 is started, it drives the drum 12 to rotate. During the rotation of the drum 12, the spiral blades 121 tumble and push the raw material axially, causing the raw material to continuously tumble and move towards the discharge end inside the drum 12. At the same time, the hot air box 21 outputs heated airflow, which is introduced into the air supply duct 23 through the air collector hood 22, and then discharged into the drum 12 through multiple air outlets 24. The raw material inside the drum 12 is in full contact with the hot airflow while tumbling, so as to complete the drying process.

[0022] See Figure 1 , Figure 4 , Figure 6After the raw material is dried inside the drum 12, the exhaust gas is discharged along the discharge end of the drum 12 and directly enters the collection hood 31, which is connected to the inside of the drum 12. Then, the exhaust gas is guided into the filter box 33 through the collection hood 31. After the exhaust gas enters the filter box 33, the dust in the exhaust gas is intercepted by the dust filtration mechanism 4. The filtered exhaust gas enters the return air pipe 38 from the upper part of the filter box 33, and then is divided into multiple diversion pipes 39 that pass through the hoppers 16. The multiple diversion pipes 39 preheat the raw material to be entered into the drum 12 inside the hoppers 16. Then, the exhaust gas in the multiple diversion pipes 39 merges into the connecting pipe 310 and enters the hot air box 21 near the air inlet through the connecting pipe 310, so that the hot air box 21 can draw it in again, thereby completing a complete drying, exhaust gas collection, exhaust gas filtration, material preheating and exhaust gas return process. Example

[0023] See Figure 4 , Figure 6 , Figure 7 Based on Example 1, the specific structure of the waste heat recovery mechanism 3 is further described as follows: The collection hood 31 is trumpet-shaped, with the larger end of the collection hood 31 facing the discharge end of the drum 12, and the smaller end of the collection hood 31 connected to the filter box 33. The trumpet-shaped collection hood 31 is used to expand the collection range of the exhaust gas at the discharge end of the drum 12. A cross-shaped hollow frame 32 is provided inside the collection hood 31. The end of the air supply duct 23 away from the air collection hood 22 is fixed to the cross-shaped hollow frame 32. The cross-shaped hollow frame 32 is located inside the collection hood 31 and is fixedly engaged with the collection hood 31. The cross-shaped hollow frame 32 supports and positions the end of the air supply duct 23 on the one hand, and reserves a flow space for the exhaust gas to enter the interior of the collection hood 31 through the hollow form, so that the hot air delivery path and the exhaust gas recovery path are stably connected at both ends of the drum 12.

[0024] See Figure 4 , Figure 6 , Figure 7 The filter box 33 is fixed to the outside of the collection cover 31. A sealing cover 34 is installed on the top of the filter box 33 to seal the opening at the top of the filter box 33, so as to facilitate the formation of a stable exhaust gas flow space inside the filter box 33. A C-shaped opening 35 is opened on the lower side of the filter box 33 away from the collection cover 31. A support plate 36 is fixed inside the lower part of the filter box 33. The support plate 36 is horizontally arranged in the lower part of the filter box 33. The support plate 36 is used to support the lower installation position of the dust filtration mechanism 4 and at the same time provides an upper limit boundary for the subsequent dust falling path.

[0025] See Figure 1 , Figure 4 , Figure 6During the continuous operation of the recycled carbon black drying section, the exhaust gas discharged from the discharge end of the drum 12 first enters the collection hood 31. The collection hood 31, through its connection with the inside of the drum 12, guides the exhaust gas to the filter box 33. After filtration in the filter box 33, the exhaust gas enters the return air pipe 38 from the upper side of the filter box 33. The return air pipe 38 extends along the top of the drum 12, and multiple diversion pipes 39 are formed by the diversion at the end of the return air pipe 38. The multiple diversion pipes 39 horizontally penetrate the inside of the hopper 16. The cooperation between the multiple diversion pipes 39 and the hopper 16 allows the exhaust gas to pass through the area of ​​the hopper 16 before entering the hot air box 21. The raw material to be dried in the hopper 16 can be preheated using the residual heat of the exhaust gas, so that the raw material entering the drum 12 is at a higher initial temperature. Subsequently, the exhaust gas converges into the connecting pipe 310 through the multiple diversion pipes 39 and is then sent to the position near the air inlet of the hot air box 21 by the connecting pipe 310. The aforementioned installation and connection relationships enable the waste heat recovery mechanism 3 to not only undertake the task of collecting exhaust gas, but also to undertake the tasks of guiding exhaust gas flow, preheating raw materials, and returning heat after filtration. The overall coordination revolves around the system-level problem of the underutilization of exhaust gas heat in the drying section. Example

[0026] See Figures 6 to 10 Based on Embodiments 1 and 2, the specific structure of the dust filtration mechanism 4 is further described as follows: The dust filtration mechanism 4 includes a filter cartridge 41 rotatably mounted inside the filter box 33. The filter cartridge 41 is hollow inside and open at the top. The bottom of the filter cartridge 41 is rotatably mounted on the support plate 36. A sealing ring 42 is provided outward at the open top of the filter cartridge 41. The sealing ring 42 is adapted to the inner wall of the filter box 33. A sealing protrusion 43 is symmetrically arranged on the outer surface of the filter cartridge 41. The outer side of the sealing protrusion 43 abuts against the inner wall of the filter box 33. A filter cloth is laid on the surface of the filter cartridge 41. The sealing ring 42, the sealing protrusion 43, the inner wall of the filter box 33, and the outer surface of the filter cartridge 41 together define the flow area of ​​the exhaust gas inside the filter box 33. After the exhaust gas enters the filter box 33, it needs to be filtered by the filter cloth on the surface of the filter cartridge 41 before entering the interior of the filter cartridge 41, thereby reducing the carbon black dust entrained in the exhaust gas.

[0027] See Figure 6 , Figure 9An isolation plate 44 is fixed inside the filter cartridge 41, dividing the internal space of the filter cartridge 41. Movable plates 45 are hinged to both sides of the top of the isolation plate 44, covering the open sides of the top of the filter cartridge 41. After the exhaust gas passes through the filter cloth on the surface of the filter cartridge 41 and enters the interior of the filter cartridge 41, the corresponding movable plate 45 opens under the action of airflow, allowing the filtered exhaust gas to flow upwards and enter the upper area of ​​the filter box 33. The other movable plate 45 remains closed, thus coordinating and limiting the airflow direction inside the filter cartridge 41. The cooperation between the isolation plate 44 and the movable plate 45 allows the filter cartridge 41 to form a clear inlet and outlet side inside the filter box 33, facilitating the continued entry of the filtered exhaust gas into the return air duct 38.

[0028] See Figure 6 , Figure 8 , Figure 10 A convex ring 37 is fixed at the bottom center of the support plate 36, and positioning grooves 371 are symmetrically opened on the lower surface of the convex ring 37. A fixing post 46 is set at the bottom center of the filter cartridge 41. The fixing post 46 passes through the convex ring 37. Track grooves 47 are symmetrically opened along the axial direction on the surface of the fixing post 46. An end cap 48 is connected to the bottom of the fixing post 46 by thread. A slider 49 is slidably installed inside the fixing post 46. Positioning rods 491 are set at both ends of the slider 49. The positioning rods 491 pass through the corresponding track grooves 47. A pull rod 410 is set at the bottom of the slider 49. The pull rod 410 passes through the end cap 48. A spring 411 is sleeved on the surface of the pull rod 410. The spring 411 is located inside the fixing post 46 and between the slider 49 and the end cap 48. Spring 411 provides a reset function. Positioning rod 491 is inserted into positioning groove 371 under normal conditions to keep filter cartridge 41 in a positioned state. When it is necessary to adjust the position of filter cartridge 41, pull rod 410 is pulled down, slider 49 moves down in fixed column 46 and drives positioning rod 491 to move along track groove 47. After positioning rod 491 is disengaged from positioning groove 371, filter cartridge 41 can rotate relative to support plate 36. After filter cartridge 41 rotates to the position, pull rod 410 is released, and positioning rod 491 re-enters the corresponding positioning groove 371 under the action of spring 411 to complete the repositioning of filter cartridge 41.

[0029] See Figure 6 , Figure 8The filter box 33 has a C-shaped opening 35 on the side opposite to the collection cover 31. An arc-shaped cover 412 is slidably installed inside the C-shaped opening 35. A gap is left between the arc-shaped cover 412 and the support plate 36 inside the filter box 33. A dust collection box 413 is set inside the lower part of the arc-shaped cover 412. After the equipment has been running for a period of time, a lot of dust will be attached to the filter cloth on the surface of the filter cartridge 41. In order to avoid affecting the exhaust gas filtration process, the filter cartridge 41 can be rotated to another working position by the cooperation of the pull rod 410, the slider 49, the positioning rod 491, the positioning groove 371 and the fixing column 46. Then the arc-shaped cover 412 is slid open, and the dust attached to the outer surface of the filter cartridge 41 can fall through the corresponding area of ​​the C-shaped opening 35 and enter the dust collection box 413 through the gap between the arc-shaped cover 412 and the support plate 36. After the arc-shaped cover 412 is reset, the lower part of the filter box 33 returns to a closed state, and the dust filtration mechanism 4 continues to work with the waste heat recovery mechanism 3 to complete the exhaust gas filtration and waste heat recovery process.

[0030] The working principle of this invention is as follows: In use, the recycled carbon black raw material to be dried is added into the hopper 16, and the raw material enters the inside of the drum 12 through the feed end cover 15. Subsequently, the drive mechanism 13 is started and drives the drum 12, which is rotatably mounted on the top of the support frame 11, to rotate. During the rotation of the drum 12, the spiral blades 121 inside the drum 12 tumble and push the raw material entering the drum 12, so that the raw material moves axially and is continuously tumbled inside the drum 12, thereby forming a continuous drying state.

[0031] When the raw material moves inside the drum 12, the hot air conveying mechanism 2 works synchronously. The hot air box 21 outputs heated airflow. The heated airflow is first introduced into the air delivery duct 23 through the air collector 22, and then discharged into the drum 12 through the air outlet holes 24 evenly opened on the surface of the air delivery duct 23. During this process, the air delivery duct 23 passes through the feed end cover 15 and extends into the drum 12, so that the hot air can directly act on the raw material turning inside the drum 12, thereby cooperating with the turning action of the spiral blades 121 to air dry the raw material.

[0032] After the hot air passes through the raw material inside the drum 12 and completes the drying, the exhaust gas is discharged from the discharge end of the drum 12. Then, the collection hood 31 set at the center of the surface of the discharge end cover 14 collects this part of the exhaust gas. Since the opening of the collection hood 31 is connected to the inside of the drum 12, the exhaust gas can directly enter the collection hood 31. At the same time, the cross-shaped hollow frame 32 set inside the collection hood 31 is used to fix the end of the air supply duct 23 away from the air collection hood 22, so that the air supply duct 23 remains stable when it is inserted into the inside of the drum 12, ensuring that the hot air delivery and exhaust gas collection processes are coordinated.

[0033] Subsequently, the exhaust gas collected by the collection hood 31 enters the filter box 33 fixed to its outside. Inside the filter box 33, the dust filtration mechanism 4 filters the dust in the exhaust gas. Specifically, after the exhaust gas enters the filter box 33, it comes into contact with the filter cartridge 41, which is rotatably installed inside the filter box 33. The bottom of the filter cartridge 41 is rotatably installed on the support plate 36, and the sealing ring 42, which is set outward at the top opening, is adapted to the inner wall of the filter box 33. The outer side of the sealing protrusions 43, which are symmetrically arranged on the outer surface of the filter cartridge 41, abuts against the inner wall of the filter box 33, so that the exhaust gas is filtered along the filter cloth on the surface of the filter cartridge 41 when it flows in the filter box 33, thereby reducing the dust content entrained in the exhaust gas.

[0034] During the process of filtering the exhaust gas through the filter cartridge 41, the internal space of the filter cartridge 41 is divided by the fixed partition plate 44. The movable plates 45, which are hinged to both sides of the top of the partition plate 44, cover the open sides of the top of the filter cartridge 41 respectively. When the filtered airflow enters the filter cartridge 41, the movable plate 45 on the corresponding side can open under the action of the airflow so that the airflow can continue to flow upward, while the movable plate 45 on the other side remains covered, so that the exhaust gas is filtered and output in the filter box 33 according to the predetermined path.

[0035] After the exhaust gas is filtered, it is discharged from the return air duct 38 connected to the upper side of the filter box 33 and transported along the return air duct 38. Then, the exhaust gas is divided into multiple diversion pipes 39 at the end of the return air duct 38. The multiple diversion pipes 39 pass through the hopper 16. Therefore, the filtered exhaust gas preheats the raw materials in the hopper 16 that are about to enter the drum 12 as it flows through the diversion pipes 39. Subsequently, the exhaust gas in the multiple diversion pipes 39 is collected into the connecting pipe 310 and transported by the connecting pipe 310 to the side of the hot air box 21 near the air inlet. This allows the filtered exhaust gas to re-enter the hot air conveying mechanism 2 after preheating the raw materials in the hopper 16, thus forming a waste heat recycling process for the exhaust gas.

[0036] During continuous use of the equipment, when maintenance of the dust filtration mechanism 4 is required, the repositioning structure of the filter cartridge 41 can be used for this purpose. Specifically, a convex ring 37 is fixed at the bottom center of the support plate 36, and positioning grooves 371 are symmetrically opened on the lower surface of the convex ring 37. A fixed post 46 is set at the bottom center of the filter cartridge 41, which passes through the convex ring 37. Track grooves 47 are symmetrically opened on the surface of the fixed post 46 along the axial direction. A slider 49 is slidably installed inside the fixed post 46. Positioning rods 491 set at both ends of the slider 49 pass through the corresponding track grooves 47. A pull rod 410 is set at the bottom of the slider 49 and passes through the end cap 48. A spring 411 sleeved on the surface of the pull rod 410 is located inside the fixed post 46 and between the slider 49 and the end cap 48. When the filter cartridge 41 is in normal filtration state, the spring 411 pushes the slider 49 and the positioning rod 491 to reset, so that the positioning rod 491 cooperates with the positioning groove 371 to position the filter cartridge 41.

[0037] When the position of the filter cartridge 41 needs to be adjusted, pull down the pull rod 410. The slider 49 moves inside the fixed column 46 and drives the positioning rod 491 to move along the track groove 47, so that the positioning rod 491 disengages from the positioning groove 371. At this time, the filter cartridge 41 can rotate relative to the support plate 36. Then, after rotating the filter cartridge 41 to another position, release the pull rod 410. Under the action of the spring 411, the positioning rod 491 engages with the corresponding positioning groove 371 again, thereby completing the repositioning of the filter cartridge 41 so as to continue the filtration operation or switch the working area of ​​the outer surface of the filter cartridge 41.

[0038] When cleaning the filter box 33, the operation can be carried out through the C-shaped opening 35 located on the side of the filter box 33 away from the collection cover 31. When ash discharge or cleaning is required, the arc-shaped cover 412 installed inside the C-shaped opening 35 is slidably moved to open the C-shaped opening 35. The gap reserved between the arc-shaped cover 412 and the support plate 36 is used to allow the dust that falls off during the cleaning process to fall into the dust collection box 413 located inside the arc-shaped cover 412, thereby achieving dust collection. After cleaning, the arc-shaped cover 412 is reset to cooperate with the filter box 33 to continue to filter the exhaust gas and recover waste heat.

[0039] In summary, after the raw material enters the drum 12 through the hopper 16, it is dried under the combined action of the drive mechanism 13, the drum 12, the spiral blades 121, and the hot air conveying mechanism 2. The exhaust gas generated during drying is then collected and filtered through the collection hood 31, the filter box 33, and the dust filtration mechanism 4. The filtered exhaust gas is then returned to the hot air box 21 through the return air pipe 38, the diversion pipe 39, and the connecting pipe 310. During the return process, the raw material in the hopper 16 is preheated, thus completing a typical exhaust gas waste heat recycling process.

[0040] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A device for recycling waste heat from exhaust gas in the drying section of recycled carbon black, comprising a drying mechanism (1), characterized in that: The drying mechanism (1) includes a drum (12), inside which are arranged spiral blades (121). A hopper (16) is provided at one end of the drum (12), and a hot air conveying mechanism (2) is provided on one side of the drum (12) to convey heated airflow into the drum (12) for drying the raw materials. A waste heat recovery mechanism (3) is provided at the discharge end of the drum (12), inside which is a dust filtration mechanism (4). The waste heat recovery mechanism (3) is used to collect the exhaust gas discharged from the drum (12). The dust filtration mechanism (4) is used to filter dust in the exhaust gas; the waste heat recovery mechanism (3) is connected to a return air pipe (38), and the end of the return air pipe (38) is divided into multiple diversion pipes (39) that pass through the hopper (16). The ends of the multiple diversion pipes (39) away from the return air pipe (38) are all connected to the connecting pipe (310). The connecting pipe (310) is connected to the side of the hot air conveying mechanism (2) near the air inlet, so that the filtered exhaust gas preheats the raw materials in the hopper (16) and then sends them back to the hot air conveying mechanism (2), thereby realizing the recycling of exhaust gas waste heat.

2. The waste heat recycling device for tail gas in the drying section of recycled carbon black according to claim 1, characterized in that: The drying mechanism (1) further includes a support frame (11), a drive mechanism (13), a discharge end cover (14), and a feed end cover (15). The support frame (11) is rotatably mounted on the top of the roller (12). The roller (12) is hollow inside and open at both ends. The discharge end cover (14) and the feed end cover (15) are respectively located at both ends of the roller (12). The drive mechanism (13) is located on the inner side of the support frame (11) and is used to drive the roller (12) to rotate. The hopper (16) is fixed to the top of the feed end cover (15).

3. The waste heat recycling device for the tail gas in the drying section of recycled carbon black according to claim 1, characterized in that: The hot air conveying mechanism (2) includes a hot air box (21), an air collecting hood (22) and an air supply duct (23). The hot air box (21) is fixed to the outer end face of the feed end cover (15). The air collecting hood (22) is fixed to the inner side of the hot air box (21). The air supply duct (23) is located at the end of the air collecting hood (22) and extends through the feed end cover (15) into the roller (12). The surface of the air supply duct (23) is evenly provided with air outlet holes (24).

4. A waste heat recycling device for tail gas in a carbon black drying section according to claim 3, characterized in that: The waste heat recovery mechanism (3) includes a collection hood (31) and a filter box (33). The collection hood (31) is fixed to the center of the surface of the discharge end cover (14). The opening of the collection hood (31) is connected to the inside of the drum (12). The filter box (33) is fixed to the outside of the collection hood (31). The return air pipe (38) is connected to the upper side of the filter box (33).

5. A waste heat recycling device for tail gas in a carbon black drying section according to claim 4, characterized in that: The collection hood (31) is trumpet-shaped, and a cross-shaped hollow frame (32) is provided on the inner side of the collection hood (31). The end of the air supply duct (23) away from the air collection hood (22) is fixed on the cross-shaped hollow frame (32). A sealing cover (34) is installed on the top of the filter box (33). A C-shaped opening (35) is opened on the lower side of the filter box (33) away from the collection hood (31). A support plate (36) is fixed inside the filter box (33).

6. A waste heat recycling device for tail gas in a carbon black drying section according to claim 1, characterized in that: The dust filtration mechanism (4) includes a filter cartridge (41), which is rotatably installed inside the filter box (33). The filter cartridge (41) is hollow inside and open at the top. The bottom of the filter cartridge (41) is rotatably installed on the support plate (36). A sealing ring (42) is provided outward at the open top of the filter cartridge (41). The sealing ring (42) is adapted to the inner wall of the filter box (33). A sealing protrusion (43) is symmetrically arranged on the outer surface of the filter cartridge (41). The outer side of the sealing protrusion (43) abuts against the inner wall of the filter box (33). A filter cloth is laid on the surface of the filter cartridge (41).

7. A waste heat recycling device for tail gas in a carbon black drying section according to claim 6, characterized in that: The filter cartridge (41) has a partition plate (44) fixed inside. The partition plate (44) divides the internal space of the filter cartridge (41). Movable plates (45) are hinged to both sides of the top of the partition plate (44). The movable plates (45) are used to cover the openings on both sides of the top of the filter cartridge (41).

8. A waste heat recycling device for tail gas in a carbon black drying section according to claim 6, characterized in that: A convex ring (37) is fixed at the bottom center of the support plate (36). A positioning groove (371) is symmetrically opened on the lower surface of the convex ring (37). A fixing column (46) is set at the bottom center of the filter cylinder (41). The fixing column (46) passes through the convex ring (37). A track groove (47) is symmetrically opened on the surface of the fixing column (46) along the axial direction. An end cap (48) is screwed to the bottom of the fixing column (46). A slider (49) is slidably installed inside the fixing column (46). A positioning rod (491) is set at both ends of the slider (49). The positioning rod (491) passes through the corresponding track groove (47). A pull rod (410) is set at the bottom of the slider (49). The pull rod (410) passes through the end cap (48). A spring (411) is sleeved on the surface of the pull rod (410). The spring (411) is located inside the fixing column (46) and between the slider (49) and the end cap (48).

9. A waste heat recycling device for tail gas in a carbon black drying section according to claim 5, characterized in that: The filter box (33) has a C-shaped opening (35) on the side away from the collection cover (31) and an arc-shaped cover (412) is slidably installed inside the C-shaped opening (35). There is a gap between the arc-shaped cover (412) and the support plate (36) inside the filter box (33). A dust collection box (413) is provided inside the arc-shaped cover (412).

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