Waste gas treatment device for graphite purification

Abstract

The invention belongs to the related technical field of waste gas treatment, and particularly discloses a waste gas treatment device for graphite purification, which comprises a treatment tower, a purification chamber is installed at the upper part in the treatment tower in a communicating manner, an air exhaust mechanism is arranged in the purification chamber, and a waste gas inlet pipe is installed at the lower part in the treatment tower in a communicating manner; a lower conical hopper is installed in the middle of the interior of the treatment tower in a communicating mode, an air exhaust fan is arranged in the middle of the interior of the lower conical hopper, a bobbin is installed on the upper portion of the interior of the air exhaust fan in a communicating mode, guide pipes are installed on the two sides of the interior of the bobbin in a communicating mode respectively, rotating connectors are installed on the upper portions of the exteriors of the guide pipes, and hoses are arranged on the upper portions of the interiors of the rotating connectors. According to the high-efficiency acid mist removal device, efficient acid mist removal is achieved, the high-efficiency acid mist removal device is particularly suitable for high-humidity, high-viscosity and particle-containing graphite purification waste gas scenes, and the ecological environment is guaranteed.

Description

Technical Field

[0001] This invention belongs to the technical field of waste gas treatment, and specifically discloses a waste gas treatment device for graphite purification. Background Art

[0002] The pickling process during graphite purification generates a large amount of acid mist gas, which seriously pollutes the air. Chinese Patent No. CN201949779U discloses a waste gas treatment device for graphite purification, including a reaction vessel, a water supply tank, and an acid mist absorption tower. The water supply tank is connected to the acid mist absorption tower through a pipeline. A waste gas discharge pipe is provided between the reaction vessel and the acid mist absorption tower. One end of the waste gas discharge pipe is connected to the tail gas outlet at the top of the reaction vessel, and the other end is connected to the acid mist gas inlet at the bottom of the acid mist absorption tower. The purified gas outlet at the top of the acid mist absorption tower is connected to the purified gas discharge pipe.

[0003] While this technical solution can address acid mist treatment, the acid mist absorption tower operates continuously, consuming a significant amount of spray neutralizing agent, resulting in excessive energy waste. The addition of excessive alkaline neutralizing agent can cause internal corrosion and generate high-salt wastewater, leading to secondary pollution. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the background art, and to propose a waste gas treatment device for graphite purification, including a treatment tower. A purification chamber is installed above the interior of the treatment tower, and an exhaust mechanism is installed inside the purification chamber. A waste gas inlet pipe is installed below the interior of the treatment tower. A lower conical hopper is installed in the middle of the interior of the treatment tower, and an exhaust fan is installed in the middle of the lower conical hopper. A cylindrical tube is installed above the interior of the exhaust fan, and guide tubes are installed on both sides of the cylindrical tube. A rotating connector is installed above the exterior of the guide tubes, and a flexible hose is installed above the interior of the rotating connector. A fixing component is installed at the upper end of the flexible hose. A spiral rod is installed on the upper surface of the rotating connector, and pushing mechanisms are arranged equidistantly along the spiral upward direction on the exterior of the spiral rod. During rotation, the pushing mechanism acts on the outer wall of the hose, reducing the frequent blockage caused by viscous acid mist scaling during the rolling process.

[0005] Preferably, the air extraction mechanism includes an air intake pipe connected to and installed above the interior of the cleanroom, and an air intake fan is provided at the end of the air intake pipe away from the cleanroom.

[0006] Preferably, a spray pipe is installed above the interior of the purification chamber, one end of the spray pipe is connected to an ultrasonic atomizer, and multiple atomizing nozzles are installed inside the lower part of the spray pipe.

[0007] Preferably, the fixing component includes a retaining shell disposed at the upper end of the hose, and retaining blocks are disposed on both sides of the retaining shell. A loading frame is disposed above the interior of the processing tower, and the two sets of retaining blocks are respectively engaged on the outer sides of the loading frame.

[0008] Preferably, the pushing mechanism includes fixed blocks arranged at equal intervals along the upper outer side of the spiral rod, a hydraulic cylinder is provided inside the fixed block, a retainer is provided at the telescopic end of the hydraulic cylinder, and a roller is rotatably provided inside the retainer.

[0009] Preferably, a geared disc is provided on the outside of the rotating connector, a gear is meshed on one side of the outer side of the geared disc, a second motor is provided above the gear, and a housing is provided on both sides of the inside of the processing tower corresponding to the second motor, and the second motor is installed inside the housing.

[0010] Preferably, an upper conical hopper is provided inside the treatment tower and above the loading frame. An annular shell is embedded in the lower part of the upper conical hopper. Liquid guide pipes are respectively connected to both sides of the annular shell. Both liquid guide pipes extend to the outside of the treatment tower, and a water treatment mechanism is connected to the end of the liquid guide pipe away from the treatment tower. A shaped guide plate is clamped on the inner surface of the upper conical hopper, and multiple sets of guide holes are opened on the outer surfaces of both sides of the shaped guide plate above the annular shell.

[0011] Preferably, the water treatment mechanism includes a neutralization cylinder connected to the end of the liquid guide pipe away from the treatment tower. The neutralization cylinder is fixedly installed outside the treatment tower. A dosing tank is connected above the neutralization cylinder via a liquid discharge pipe. A control valve is installed on one side inside the liquid discharge pipe. A liquid concentration detection sensor is connected to one side inside the neutralization cylinder. A No. 1 motor is installed at the bottom of the neutralization cylinder. The output shaft of the No. 1 motor extends into the neutralization cylinder, and a stirring rod is provided at the end of the No. 1 motor. A drainage pipe is connected to one side at the bottom of the neutralization cylinder.

[0012] Preferably, a vertically recessed pipe is connected and installed at the corner of the conduit, and one end of the recessed pipe extends to the bottom of the lower cone. A solenoid valve is connected and installed on one side of the recessed pipe. Two sets of gas concentration detection sensors are installed above the interior of the purification chamber. A drain pipe is connected and installed on one side of the interior of the lower cone.

[0013] Compared with the prior art, the present invention has the following beneficial effects: By installing an exhaust fan at the lower conical hopper, the exhaust gas entering through the inlet pipe is guided into the two ducts. A spiral rod drives an external fixed block to rotate. The hydraulic cylinder at the fixed block uses reciprocating rollers to press against the outer wall of the flexible hose, causing periodic deformation. The exhaust gas entering the hose passes through multiple changing paths of varying widths, trapping graphite particles. The gas rises continuously as it is drawn by the exhaust fan in the purification chamber. Upon encountering the pressure-blocking inner wall of the hose, the graphite particles combine with acid mist to form a sticky acid mist scale that adheres to the inner wall. After the machine stops, the reciprocating rollers press against the scale, peeling it off. The scale then falls due to gravity, thus reducing the concentration of graphite particles in the exhaust gas. The addition of graphite particles reduces the load on subsequent atomization. When the exhaust gas enters the purification chamber, the ultrasonic atomizer delivers water to the spray pipe, which is then sprayed out through multiple atomizing nozzles to capture acid mist. The acid mist droplets collide and merge, increasing their weight. During the spraying process, the droplets, after gaining weight, are guided to the inner cavity of the ring shell by the shaped guide plate and then discharged into the neutralization cylinder by the liquid guide pipe. At this time, the acidic solution falling into the neutralization cylinder is detected by the liquid concentration detection sensor. Based on the amount of acidic solution, the control valve precisely controls the alkaline solution in the dosing tank to enter the neutralization cylinder. Under the stirring of the No. 1 motor, the wastewater is neutralized. This method not only controls the addition of alkaline solution according to the usage amount but also treats the wastewater in the acid mist, making it both environmentally friendly and recyclable. By setting an ultrasonic atomizer to control the spray, the droplet size can be made uniform, and it is not easy to form a liquid film accumulation at the atomizing nozzle. It is also suitable for viscous acid mist in graphite purification. The ultrafine droplets can penetrate its surface tension layer, avoiding the formation of large scale. Attached Figure Description

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is another schematic diagram of the overall connection structure of the present invention; Figure 3 This is a schematic diagram of the connection structure of the inner part of the processing tower in this invention; Figure 4 This is a schematic diagram of the connection structure of the indoor part of the purification chamber in this invention; Figure 5 This is a schematic diagram of the internal connection structure between the annular shell and the upper conical hopper of the present invention; Figure 6 This is a schematic diagram of the connection structure of the pushing mechanism of the present invention; Figure 7 This is a schematic diagram of the connection structure of the inner part of the cylinder in this invention; Figure 8 For the present invention Figure 6 Enlarged schematic diagram of the structure at point A in the middle.

[0015] In the picture: 1. Treatment tower; 2. Suction fan; 3. Suction pipe; 4. Clean room; 5. Gas concentration sensor; 6. Ultrasonic atomizer; 7. Neutralization cylinder; 8. Shell; 9. Drain pipe; 10. Drain pipe; 11. Liquid concentration sensor; 12. Dosing tank; 13. Geared disc; 14. Lower cone; 15. Exhaust fan; 16. Conduit; 17. Motor No. 1; 18. Control valve; 19. Upper cone; 20. Guide hole; 1. Irregularly shaped guide plate; 22. Atomizing nozzle; 23. Spray pipe; 24. Liquid guide pipe; 25. Ring shell; 26. Gear; 27. No. 2 motor; 28. Hose; 29. ​​Clamping case; 30. Loading frame; 31. Clamping block; 32. Sinking pipe; 33. Liquid drain pipe; 34. Stirring rod; 35. Clamping seat; 36. Hydraulic cylinder; 37. Fixing block; 38. Spiral rod; 39. Roller; 40. Exhaust gas inlet pipe; 41. Rotary connector. DETAILED DESCRIPTION

[0016] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0018] like Figures 1-8 The waste gas treatment device for graphite purification shown includes a treatment tower 1. A purification chamber 4 is installed at the top inside the treatment tower 1. An exhaust mechanism is installed inside the purification chamber 4. A waste gas inlet pipe 40 is installed at the bottom inside the treatment tower 1. The waste gas inlet pipe 40 can be used to introduce waste gas into the treatment tower 1 for acid mist treatment. A lower cone hopper 14 is installed in the middle inside the treatment tower 1. An exhaust fan 15 is installed in the middle inside the lower cone hopper 14. A cylinder is installed at the top inside the exhaust fan 15. A conduit 16 is installed on both sides inside the cylinder. The exhaust fan 15 draws waste gas into the cylinder and then distributes it to the conduits 16 on both sides. A rotating connector 41 is installed at the top outside the conduit 16. A flexible hose 28 is installed at the top inside the rotating connector 41. A fixing part is installed at the upper end of the flexible hose 28. A spiral rod 38 is installed on the upper surface of the rotating connector 41. Pushing mechanisms are arranged at equal intervals along the spiral upward direction on the outside of the spiral rod 38. During rotation, the pushing mechanism can act on the outer wall of the hose 28 to press and roll, reducing the problem of frequent blockage caused by viscous acid mist scaling.

[0019] The exhaust mechanism includes an exhaust pipe 3 connected to the upper part of the purification chamber 4. An exhaust fan 2 is provided at the end of the exhaust pipe 3 away from the purification chamber 4. The exhaust fan 2 can draw exhaust gas from inside the lower cone hopper 14.

[0020] A spray pipe 23 is installed above the interior of the purification chamber 4. One end of the spray pipe 23 is connected to an ultrasonic atomizer 6. Multiple atomizing nozzles 22 are installed inside the lower part of the spray pipe 23. An upper cone 19 is installed inside the treatment tower 1 and above the loading frame 30. An annular shell 25 is embedded in the lower part of the upper cone 19. Liquid guide pipes 24 are connected to both sides of the annular shell 25. Both liquid guide pipes 24 extend to the outside of the treatment tower 1. A water treatment mechanism is connected to the end of the liquid guide pipes 24 away from the treatment tower 1. A special-shaped guide plate 21 is clamped on the inner surface of the upper cone 19. Multiple sets of guide holes 20 are opened on the outer surfaces of both sides of the special-shaped guide plate 21 above the annular shell 25. The ultrasonic atomizer 6 atomizes water into tiny particles, which are then sprayed out through the atomizing nozzle 22 to capture acid mist in the exhaust gas, increase the contact area, and cause the acid mist droplets to collide and merge. The droplets then gain weight and fall onto both sides of the irregular guide plate 21 under gravity, guiding the weighted droplets to flow into the annular shell 25. This stage improves the gas-liquid separation efficiency, avoids secondary entrainment of droplets, and ensures that the purified gas is dry and clean. The ultrasonic atomizer 6 is a common industrial-grade ultrasonic atomizer, with its internal water inlet pipe connected to the external water tank.

[0021] The fasteners include a retainer 29 located at the upper end of the hose 28, with retaining blocks 31 on both sides of the retainer 29. A loading rack 30 is located above the interior of the processing tower 1, and the two sets of retaining blocks 31 are respectively engaged on the outer sides of the loading rack 30. The upper end of the hose 28 is fixed to the loading frame 30 by the clamp 29 and the clamp 31, and the lower end is connected to the rotating connector 41.

[0022] The pushing mechanism includes fixed blocks 37 arranged equidistantly along the upper part of the spiral rod 38. A hydraulic cylinder 36 is installed inside the fixed block 37. A card seat 35 is installed at the telescopic end of the hydraulic cylinder 36. A roller 39 is rotatably installed inside the card seat 35. A gear plate 13 is installed outside the rotating connector 41. A gear 26 is meshed on one side of the outer side of the gear plate 13. A second motor 27 is installed above the gear 26. A housing 8 is connected to both sides of the inside of the processing tower 1 corresponding to the second motor 27. The second motor 27 is installed inside the housing 8. The hose 28 can be made of polytetrafluoroethylene. The second motor 27 drives the gear 26 to rotate, which drives the gear disc 13 connected on one side to rotate, causing the spiral rod 38 to rotate. The card seat 35, fixing block 37 and roller 39 located outside the spiral rod 38 rotate outside the hose 28. The reciprocating extension and retraction of the hydraulic cylinder 36 causes the roller 39 to roll and press against the outside of the hose 28. Under the pressure of the roller 39, the hose 28 undergoes periodic deformation. Graphite particles are captured by the pipe wall due to the change in the path width. Graphite particles can combine with acid mist to form viscous acid mist scale, which increases their own particle size. They fall into the sinking pipe 32 with gravity. The sinking pipe 32 is discharged periodically in the later stage to ensure the continuous removal of graphite particles. After the machine stops, the roller 39 increases in force as the hydraulic cylinder 36 extends and retracts, which can powerfully remove stubborn scale during rotation. The hydraulic cylinder 36 is a small cylinder.

[0023] The water treatment mechanism includes a neutralization cylinder 7 connected to the end of the liquid guide pipe 24 away from the treatment tower 1. The neutralization cylinder 7 is fixedly installed outside the treatment tower 1. A dosing tank 12 is connected to the top of the neutralization cylinder 7 through a liquid discharge pipe 33. A control valve 18 is installed on one side inside the liquid discharge pipe 33. A liquid concentration detection sensor 11 is connected to one side inside the neutralization cylinder 7. A No. 1 motor 17 is installed at the bottom of the neutralization cylinder 7. The output shaft of the No. 1 motor 17 extends into the interior of the neutralization cylinder 7, and a stirring rod 34 is provided at the end of the No. 1 motor 17. A drainage pipe 10 is connected to one side at the bottom of the neutralization cylinder 7. During the spraying process, the droplets, after gaining weight, flow into the inner cavity of the annular shell 25 under the guidance of the irregularly shaped guide plate 21. Then, they are discharged into the neutralization cylinder 7 through the liquid guide pipe 24. The neutralization cylinder 7 is equipped with a liquid concentration detection sensor 11 to detect the concentration of the acidic solution. Based on the concentration detection result, the control valve 18 precisely controls the alkaline solution in the dosing tank 12 to enter the neutralization cylinder 7. At the same time, the No. 1 motor 17 drives the stirring rod 34 to stir, thereby achieving the neutralization treatment of the wastewater. The treated wastewater is discharged through the drainage pipe 10 for easy recycling.

[0024] A vertically oriented sinking pipe 32 is connected and installed at the corner of the conduit 16, and one end of the sinking pipe 32 extends to the bottom of the lower cone 14. A solenoid valve is connected and installed on one side of the sinking pipe 32. Two sets of gas concentration detection sensors 5 are installed at the top of the interior of the purification chamber 4, which can monitor the gas concentration in real time, prompting the use of the exhaust fan 15 and the suction fan 2. It is also connected to an external PLC controller to adjust the atomization density of the ultrasonic atomizer 6 and the flow rate of the atomizing nozzle 22. A drain pipe 9 is connected and installed on one side of the interior of the lower cone 14.

[0025] Working principle: During use, the waste gas generated from graphite purification enters the treatment tower 1 through the waste gas inlet pipe 40. The exhaust fan 15 in the lower cone hopper 14 starts to generate negative pressure, guiding the waste gas into the cylinder and into the corresponding hose 28 through the conduits 16 on both sides. The second motor 27 drives the gear 26 to rotate, which drives the rotating connector 41 to rotate through the meshing gear disc 13. This causes the spiral rod 38 to drive the fixed block 37, hydraulic cylinder 36, clamp 35, and roller 39 to rotate. Under the extension and retraction of the hydraulic cylinder 36, the roller 39 acts on the outer wall of the hose 28, causing the hose 28 to undergo periodic elastic deformation. The inner wall of the hose 28 forms an alternating wide and narrow flow path due to the pressure of the roller 39. The graphite particles in the waste gas can react with the acid mist to form a sticky acid mist scale that adheres to the inner wall of the hose 28. Through the rolling and pressing of the retracting roller 39, the sticky acid mist scale is peeled off and falls into the lower pipe 32 by gravity.

[0026] Simultaneously, the ultrasonic atomizer 6 inside the purification chamber 4 begins spraying liquid. Gas rises through the guide holes 20 at the irregular guide plate 21, causing the gas to gather from both sides upwards. The droplets sprayed from the atomizing nozzle 22 come into full contact with the acidic gas, capturing the acid mist droplets, colliding and merging to increase their weight. After the droplets increase in weight, they fall onto the outer surfaces of both sides of the irregular guide plate 21, flow along the plate wall into the ring shell 25, and are discharged into the neutralization cylinder 7 through the liquid guide pipe 24. This stage improves the efficiency of gas-liquid separation and avoids secondary entrainment of droplets. The liquid concentration detection sensor 11 inside the neutralization cylinder 7 monitors the pH value of the wastewater in real time. When the pH value is too high, the control valve 18 opens, and the alkaline solution in the dosing tank 12 is injected into the neutralization cylinder 7 through the liquid drain pipe 33. At this time, the No. 1 motor 17 drives the stirring rod 34 to stir until the pH value stabilizes. The neutralized wastewater can be reused through the drainage pipe 10 (it can flow back into the ultrasonic atomizer 6 to realize the recycling of water resources).

[0027] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A waste gas treatment device for graphite purification, comprising a treatment tower (1), characterized in that: The processing tower (1) is connected to the upper part of the purification chamber (4), and the purification chamber (4) is equipped with an exhaust mechanism. The processing tower (1) is connected to the lower part of the exhaust gas inlet pipe (40). The processing tower (1) is connected to the middle of the middle of the middle of the middle of the middle of the middle of the lower cone hopper (14). The exhaust fan (15) is installed in the middle of the middle of the middle of the middle of the middle of the middle of the middle of the middle of the middle of the middle of the exhaust fan (15). The cylinder is connected to the upper part of the middle ... During rotation, the pushing mechanism can act on the outer wall of the hose (28) to reduce the problem of frequent blockage caused by viscous acid mist scaling during the rolling process.

2. The waste gas treatment device for graphite purification according to claim 1, characterized in that: The air extraction mechanism includes an air intake pipe (3) connected to the upper part of the cleanroom (4), and an air intake fan (2) is provided at the end of the air intake pipe (3) away from the cleanroom (4).

3. The waste gas treatment device for graphite purification according to claim 1, characterized in that: The purification chamber (4) is equipped with a spray pipe (23) on the upper part of the interior. One end of the spray pipe (23) is connected to an ultrasonic atomizer (6), and multiple atomizing nozzles (22) are installed inside the lower part of the spray pipe (23).

4. The waste gas treatment device for graphite purification according to claim 1, characterized in that: The fastener includes a retainer (29) set at the upper end of the hose (28), and retainer blocks (31) are provided on both sides of the retainer (29). A loading rack (30) is provided inside the upper part of the processing tower (1), and the two sets of retainer blocks (31) are respectively clamped on the outside of the loading rack (30) on both sides.

5. The waste gas treatment device for graphite purification according to claim 1, characterized in that: The pushing mechanism includes fixed blocks (37) arranged equidistantly above the outside of the spiral rod (38). A hydraulic cylinder (36) is provided inside the fixed block (37). A card seat (35) is provided at the telescopic end of the hydraulic cylinder (36). A roller (39) is rotatably provided inside the card seat (35).

6. The waste gas treatment device for graphite purification according to claim 1, characterized in that: The rotating connector (41) is provided with a gear disc (13) on the outside. A gear (26) is meshed on one side of the gear disc (13). A second motor (27) is provided above the gear (26). A housing (8) is provided on both sides of the processing tower (1) corresponding to the second motor (27). The second motor (27) is installed inside the housing (8).

7. The waste gas treatment device for graphite purification according to claim 1, characterized in that: An upper conical hopper (19) is provided inside the processing tower (1) and above the loading frame (30). An annular shell (25) is embedded in the lower part of the upper conical hopper (19). Liquid guide pipes (24) are respectively connected to both sides of the annular shell (25). Both liquid guide pipes (24) extend to the outside of the processing tower (1). A water treatment mechanism is connected to the end of the liquid guide pipe (24) away from the processing tower (1). A shaped guide plate (21) is clamped on the inner surface of the upper conical hopper (19). Multiple sets of guide holes (20) are opened on the outer surfaces of both sides of the shaped guide plate (21) above the annular shell (25).

8. The waste gas treatment device for graphite purification according to claim 7, characterized in that: The water treatment mechanism includes a neutralization cylinder (7) connected to a liquid guide pipe (24) at one end away from the treatment tower (1). The neutralization cylinder (7) is fixedly installed outside the treatment tower (1). A dosing tank (12) is connected above the neutralization cylinder (7) via a liquid drain pipe (33). A control valve (18) is installed on one side inside the liquid drain pipe (33). A liquid concentration detection sensor (11) is connected to one side inside the neutralization cylinder (7). A No. 1 motor (17) is installed at the bottom of the neutralization cylinder (7). The output shaft of the No. 1 motor (17) extends into the neutralization cylinder (7), and a stirring rod (34) is provided at the end of the No. 1 motor (17). A drainage pipe (10) is connected to one side at the bottom of the neutralization cylinder (7).

9. The waste gas treatment device for graphite purification according to claim 1, characterized in that: A vertical sinking pipe (32) is connected and installed at the corner inside the conduit (16), and one end of the sinking pipe (32) extends to the bottom of the lower cone (14). A solenoid valve is connected and installed on one side inside the sinking pipe (32). Two sets of gas concentration detection sensors (5) are installed above the inside of the purification chamber (4). A drain pipe (9) is connected and installed on one side inside the lower cone (14).

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