A device and process for treating exhaust gas from calcium dobesilate production

Abstract

The application discloses a calcium dobesilate production waste gas treatment equipment and treatment process, relates to the technical field of waste gas treatment, and comprises a tower body, a first waste gas treatment device and a second waste gas treatment device. The second waste gas treatment device comprises an inner cylinder and an outer cylinder arranged coaxially, the outer cylinder is in a hollow shape, the bottom of the outer cylinder is closed and wraps the bottom of the inner cylinder, and the inner space of the outer cylinder and the inner cylinder is used for containing activated carbon. A lifting mechanism is arranged in the inner cylinder and is used for driving the activated carbon to continuously rise in the inner cylinder. A guiding and crushing mechanism is arranged at the top of the outer cylinder and is used for guiding the activated carbon in the inner cylinder to enter the inner space of the outer cylinder from the top end of the outer cylinder, so that the activated carbon reciprocally and circularly moves between the outer cylinder and the inner cylinder. The guiding and crushing mechanism is also used for crushing the activated carbon. A cleaning mechanism is arranged below the outer cylinder and is used for blowing and cleaning the surface of the activated carbon. The application has the effect of improving the adsorption efficiency of the activated carbon.

Description

Technical Field

[0001] This application relates to the technical field of waste gas treatment, and in particular to a waste gas treatment device and process for the production of calcium hydroxybenzenesulfonate. Background Technology

[0002] Calcium dobesilate is a commonly used drug for treating microvascular diseases, especially in improving microcirculation and reducing vascular permeability. Clinically, it is mainly used for some conditions caused by venous and microcirculatory disorders, such as microvascular complications caused by diabetes, hemorrhoids, and varicose veins.

[0003] Calcium hydroxybenzenesulfonate undergoes synthesis and neutralization reactions during production, generating harmful waste gases, such as sulfur dioxide during the synthesis reaction. Sulfur dioxide can be removed from these waste gases using adsorption. The adsorption method involves passing the waste gas through a tower or other sealed container filled with an adsorbent (such as activated carbon). The activated carbon's adsorption properties remove sulfur dioxide from the waste gas, thus achieving waste gas purification.

[0004] When sulfur dioxide is removed by conventional adsorption, the position of the activated carbon used as the adsorbent is fixed. This means that only the activated carbon on the outer layer plays the main adsorption role, while the activated carbon on the inner layer plays a very small role. This not only prevents the activated carbon from being fully utilized, but may also lead to incomplete waste gas treatment over a long period of time. Summary of the Invention

[0005] In order to improve the situation where activated carbon cannot be fully utilized and the waste gas treatment is not thorough when working for a long time, this application provides a waste gas treatment equipment and process for calcium hydroxybenzenesulfonate production.

[0006] On the one hand, this application provides a waste gas treatment device for calcium hydroxybenzenesulfonate production, which adopts the following technical solution:

[0007] A waste gas treatment device for calcium hydroxybenzenesulfonate production, including

[0008] The tower body is placed vertically and is hollow inside. The side wall of the tower body is provided with an air inlet and the top is provided with an air outlet.

[0009] The first waste gas treatment device is located inside the tower and is used to spray alkaline solution onto the waste gas.

[0010] The second waste gas treatment device is located above the first waste gas treatment device.

[0011] The second waste gas treatment device includes an inner cylinder and an outer cylinder arranged coaxially. The outer cylinder is hollow and its inner diameter is larger than that of the inner cylinder. The top of the outer cylinder has an opening, while the bottom is closed and covers the bottom of the inner cylinder. The top and bottom of the inner cylinder both have openings. The internal spaces of the outer cylinder and the inner cylinder are used to hold activated carbon.

[0012] The inner cylinder is equipped with a lifting mechanism to drive the activated carbon to rise continuously inside the inner cylinder. The top of the outer cylinder is equipped with a guiding and crushing mechanism to guide the activated carbon in the inner cylinder to enter the outer cylinder from the top of the outer cylinder, so that the activated carbon can reciprocate between the outer cylinder and the inner cylinder. The guiding and crushing mechanism is also used to crush the activated carbon.

[0013] A cleaning mechanism is provided below the outer cylinder for blowing and cleaning the surface of the activated carbon as it passes.

[0014] Optionally, the lifting mechanism includes a rotating rod and a spiral conveying blade. The spiral conveying blade is spirally wound around the outer wall of the rotating rod, and the edge of the spiral conveying blade is in close contact with the inner wall of the inner cylinder. The rotating rod is coaxially arranged with the inner cylinder, extends downward through the inner cylinder, and is rotatably connected to the outer cylinder. The spiral blade extends downward into the outer cylinder.

[0015] Optionally, the guiding crushing mechanism includes a guide block, which covers the inner cylinder and leaves a gap between itself and the top of the inner cylinder for the passage of activated carbon. The rotating rod passes through the guide block and is fixed to it. The bottom surface of the guide block is provided with a guide arc surface. The distance between the guide arc surface and the outer wall of the inner cylinder gradually increases from top to bottom, and the guide arc surface gradually bends downward toward the outer cylinder. The side wall of the guide block contacts the inner wall of the outer cylinder. The guide arc surface is provided with a plurality of paddles extending radially along the outer cylinder, and all the paddles protrude downward.

[0016] Optionally, the guiding crushing mechanism further includes a crushing roller, the outer wall of which is provided with a plurality of crushing spikes, and the crushing roller is provided with a plurality of such rollers and is spaced apart around the inner cylinder. The crushing roller rotates vertically at the bottom edge of the guide block away from the inner cylinder. The side wall of the crushing roller near the inner cylinder extends out of the guide block and leaves a space between it and the inner cylinder for activated carbon to pass through.

[0017] Optionally, both ends of the crushing roller are rotatably connected to sliders, and the sliders are horizontally slidably connected inside the guide block. There is a return member between the slider and the inner wall of the guide block. The return member is placed horizontally, with one end connected to the side wall of the slider and the other end connected to the inner wall of the guide block.

[0018] Optionally, a sealing cylinder is provided outside the outer cylinder, and the sealing cylinder is coaxially sleeved on the lower part of the outer cylinder. A sealing ring is provided at the top of the sealing cylinder, and the sealing ring is coaxially sleeved on the outside of the outer cylinder. The outer wall of the sealing ring is sealed to the inner wall of the tower body, and the inner wall of the sealing ring is sealed to the outer wall of the outer cylinder. A gas guide groove is provided on the side wall of the sealing cylinder, and the gas guide groove connects the inner and outer spaces of the sealing cylinder.

[0019] Optionally, the cleaning mechanism includes an annular duct, which is located at the bottom of the closed cylinder and is coaxially arranged with the closed cylinder. The diameter of the annular duct is larger than the diameter of the outer cylinder and is used to connect to an external air supply device. Multiple air outlets are spaced apart on the annular duct, and the air outlets of the air outlets are all inclined towards the bottom surface of the outer cylinder.

[0020] Optionally, a fixing ring is coaxially sleeved on the outer cylinder near the bottom end. The fixing ring is fixedly connected to the rotating rod via a connecting rod. A striking plate is hinged to the bottom surface of the fixing ring. The rotation axis of the striking plate is perpendicular to the axis of the fixing ring. A striking block is provided on the inner side wall of the bottom end of the striking plate. The air outlet pipe faces the surface of the striking plate away from the striking block.

[0021] Optionally, the first exhaust gas treatment mechanism includes a nozzle and a connecting shaft. The nozzle is hemispherical with its arc surface facing downwards. The connecting shaft is vertically inserted through the bottom of the tower body. The top of the connecting shaft is fixed to the nozzle. The connecting shaft is rotatably connected to the tower body. The connecting shaft is hollow inside. The top of the connecting shaft is connected to the nozzle, and the bottom is used for connecting an external liquid supply device. The air inlet is located below the nozzle.

[0022] On the other hand, this application also provides a process for treating waste gas from the production of calcium dobesilate, which uses the aforementioned waste gas treatment equipment to treat the waste gas, including the following steps:

[0023] S1: First, pre-cool the exhaust gas, then start the first and second exhaust gas treatment devices. Activated carbon needs to be added to the outer and inner cylinders, and the exhaust gas is introduced into the tower body through the air inlet.

[0024] S2: The nozzle rotates and sprays an alkaline solution to neutralize the waste gas and reduce the sulfur dioxide content in the waste gas. Then the treated waste gas enters the outer cylinder from the top, where the reciprocating activated carbon adsorbs the waste gas and also adsorbs the other impurities in the waste gas. Finally, the waste gas is discharged through the outlet.

[0025] S3: During the waste gas treatment process, the cleaning mechanism intermittently cleans the activated carbon inside the outer cylinder to extend the service life of the activated carbon.

[0026] In summary, this application includes at least one of the following beneficial effects:

[0027] 1. By employing a coaxial arrangement of an outer and inner cylinder, activated carbon gradually rises within the inner cylinder under the lifting action of the spiral conveyor blades. After reaching the top of the inner cylinder, it falls into the outer cylinder under the guidance of the guide arc surface. Subsequently, the activated carbon gradually descends under its own gravity and accumulates at the bottom of the outer cylinder. Finally, it is transported back to the inner cylinder by the spiral conveyor blades, forming a complete cycle. During this reciprocating cycle, the activated carbon continuously flips itself, ensuring uniform adsorption on the surface of each piece. Furthermore, the activated carbon is continuously turned by rotating blades during circulation, ensuring that the activated carbon is evenly adsorbed. The inner activated carbon can move to the outer layer during the circulation process, allowing the inner and outer activated carbon to exchange positions, which is more conducive to full adsorption. Finally, as the activated carbon moves from the inner cylinder to the outer cylinder, the crushing roller continuously breaks the large pieces of activated carbon into smaller pieces. This helps to increase the surface area of ​​the activated carbon for adsorption, making the adsorption of waste gas more complete. Furthermore, since the broken activated carbon moves from top to bottom, the smaller pieces of activated carbon can fall into the gaps between the larger pieces, thus filling these gaps and improving the adsorption effect of waste gas.

[0028] 2. By setting a cleaning mechanism at the bottom of the outer cylinder, the air outlet pipe surrounding the outer cylinder can intermittently blow the bottom of the outer cylinder, which is beneficial for cleaning the surface of the activated carbon at the bottom of the outer cylinder. Since the activated carbon is constantly circulating between the outer and inner cylinders, all activated carbon can be cleaned when it moves to the bottom of the outer cylinder, which can improve the service life of the activated carbon and reduce the frequency of activated carbon replacement. In addition, the striking plate rotates with the fixed ring. When the striking plate rotates to the position facing the air outlet of the air outlet pipe, the striking plate is blown by the airflow from the air outlet pipe, which causes the striking plate to drive the striking block to hammer the surface of the outer cylinder. The outer cylinder vibrates after being hammered, which helps to shake off the impurities adsorbed on the surface of the activated carbon. Furthermore, when the outer cylinder vibrates, it is more conducive to smaller activated carbon particles falling into the gaps between larger activated carbon particles.

[0029] 3. By employing a dual purification mode of spraying and activated carbon adsorption, the spray nozzles rotate to spray an alkaline solution, creating a ring-shaped water mist around the nozzles. As the exhaust gas gradually rises, it passes through this ring-shaped water mist, allowing the alkaline solution to fully react with the sulfur dioxide gas in the exhaust gas, thereby reducing the sulfur dioxide content. Subsequently, the exhaust gas continues to rise into the outer and inner cylinders, where it is further adsorbed by activated carbon. The activated carbon continuously circulates, ensuring full contact with the exhaust gas and further enhancing the adsorption of sulfur dioxide, thus achieving the purification purpose. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the tower body shown in Embodiment 1 of this application;

[0031] Figure 2 This is a schematic diagram of the internal structure of the tower body shown in Embodiment 1 of this application;

[0032] Figure 3 This is a partial cross-sectional schematic diagram illustrating the outer and inner cylinder structures in Embodiment 1 of this application;

[0033] Figure 4 yes Figure 3 An enlarged view at point A;

[0034] Figure 5 This is a schematic diagram of the internal structure of the enclosed cylinder shown in Embodiment 1 of this application;

[0035] Figure 6 This is a schematic diagram of the structure of the guide block shown in Embodiment 1 of this application.

[0036] Explanation of reference numerals in the attached drawings: 1. Tower body; 11. Support leg; 12. Air inlet; 13. Air outlet; 14. Water outlet; 15. Second drive component; 2. Nozzle; 21. Connecting shaft; 22. First drive component; 3. Inner cylinder; 31. Rotating rod; 32. Spiral conveyor blade; 4. Outer cylinder; 41. Sealed cylinder; 42. Air guide groove; 43. Sealing ring; 5. Guide block; 51. Guide arc surface; 52. Paddle; 53. Receiving box; 54. Crushing roller; 55. Sliding block; 56. Return component; 6. Annular air duct; 61. Air outlet duct; 7. Fixing ring; 71. Striking plate; 72. Striking block; 73. Connecting rod. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail. Example 1

[0038] Example 1 of this application discloses a waste gas treatment device for the production of calcium hydroxybenzenesulfonate, referring to... Figure 1 and Figure 2 The waste gas treatment equipment for calcium dobesilate production includes a vertically placed tower body 1, which is hollow inside. A first waste gas treatment device and a second waste gas treatment device are installed inside the tower body 1 to absorb and treat sulfur dioxide gas in the waste gas. The tower body 1 is a frustum-shaped structure, narrower at the top and wider at the bottom. Four legs 11 are fixed to the bottom of the tower body 1, allowing it to be stably placed on the ground. An air inlet 12 is connected to the side wall of the tower body 1, through which waste gas enters the tower body 1. An air outlet 13 is connected to the top of the tower body 1, through which the purified waste gas is discharged outside the tower body 1.

[0039] The first waste gas treatment device includes a nozzle 2, with a connecting shaft 21 at its bottom. The connecting shaft 21 is coaxially arranged with the tower body 1 and passes through the bottom of the tower body 1 into its interior. The connecting shaft 21 is rotatable and sealed to the bottom wall of the tower body 1. The nozzle 2 has a hemispherical shape with its hemispherical arc surface facing downwards. Multiple water outlet holes are opened on the hemispherical arc surface of the nozzle 2. The top of the connecting shaft 21 is fixedly connected to the nozzle 2, allowing the nozzle 2 and the connecting shaft 21 to rotate synchronously.

[0040] The connecting shaft 21 is hollow inside, and its internal space is connected to the internal space of the nozzle 2. A liquid supply device such as a water pump can be connected to the bottom of the connecting shaft 21, allowing the alkaline solution to enter the nozzle 2 through the connecting shaft 21 and finally spray out from the water outlet of the nozzle 2, forming a water mist. The opening of the air inlet 12 inside the tower body 1 is located below the nozzle 2, allowing the exhaust gas entering the tower body 1 to be reacted by the water mist sprayed from the nozzle 2. A first driving component 22 is fixed at the bottom of the tower body 1. The first driving component 22 can be a small servo motor. The output shaft of the first driving component 22 is coaxially fixed to the bottom end of the connecting shaft 21, allowing the first driving component 22 to drive the nozzle 2 to rotate via the connecting shaft 21. The output shaft of the first driving component 22 can be connected to the connecting shaft 21 via a rotary joint, allowing the connecting shaft 21 to deliver the alkaline solution while rotating.

[0041] During rotation, nozzle 2 sprays an alkaline solution, creating a ring-shaped water mist around it. This mist forms a layer inside the tower body 1, enveloping the exhaust gas. As the exhaust gas rises, it passes through this mist, allowing the alkaline solution to react effectively with the sulfur dioxide, thus reducing its concentration. A water outlet 14 is connected to the side wall near the bottom of the tower body 1, allowing the purified wastewater to be discharged outside the tower body 1.

[0042] Furthermore, refer to Figures 2 to 5 The second waste gas treatment device is located above the nozzle 2 and includes an inner cylinder 3 and an outer cylinder 4 coaxially arranged. The outer cylinder 4 is perforated; specifically, it can be a perforated mesh structure or have multiple through holes on its outer wall, allowing waste gas to enter the interior of the outer cylinder 4 through these holes. The inner diameter of the outer cylinder 4 is larger than the outer diameter of the inner cylinder 3, leaving space between the outer cylinder 4 and the inner cylinder 3 for activated carbon to pass through. The top of the outer cylinder 4 has an opening, while its bottom is closed and covers the bottom of the inner cylinder 3. The bottom of the outer cylinder 4 and the bottom of the inner cylinder 3 also have spaces. The top and bottom of the inner cylinder 3 both have openings, and the side walls of the inner cylinder 3 are closed. Both the interior spaces of the outer cylinder 4 and the inner cylinder 3 can hold activated carbon.

[0043] A closed cylinder 41 is coaxially fitted around the outer cylinder 4, and the closed cylinder 41 covers the lower part of the outer cylinder 4, while the upper part of the outer cylinder 4 protrudes upward above the closed cylinder 41. Multiple air-guiding grooves 42 are spaced apart on the side wall of the closed cylinder 41, connecting the inner and outer spaces of the closed cylinder 41. Exhaust gas can enter the interior of the closed cylinder 41 from below the tower body 1 through the air-guiding grooves 42. A sealing ring 43 is fixed to the top of the closed cylinder 41, coaxially fitted around the outer cylinder 4. The outer wall of the sealing ring 43 is sealed to the inner wall of the tower body 1, and the inner wall of the sealing ring 43 is sealed to the outer wall of the outer cylinder 4. This ensures that exhaust gas can only enter the closed cylinder 41 through the air-guiding grooves 42 for purification and adsorption before being discharged from the outlet 13.

[0044] To enable the activated carbon to circulate back and forth between the outer cylinder 4 and the inner cylinder 3, a rotating rod 31 and a spiral conveying blade 32 are installed inside the inner cylinder 3. The rotating rod 31 is coaxially arranged with the inner cylinder 3, extends upward through the outside of the tower body 1, and is rotatably connected to the tower body 1. A second driving component 15, which can be a small servo motor, is fixed to the top of the tower body 1. The output shaft of the second driving component 15 is coaxially fixed with the rotating rod 31, driving the rotating rod 31 to rotate. The bottom end of the rotating rod 31 is rotatably connected to the bottom of the outer cylinder 4. The spiral conveying blade 32 is spirally wound around the outer wall of the rotating rod 31, with the edge of the spiral conveying blade 32 in close contact with the inner wall of the inner cylinder 3, and the spiral blade extends downward into the outer cylinder 4. The top of the outer cylinder 4 is higher than the top of the inner cylinder 3, facilitating the falling of activated carbon into the outer cylinder 4. The outer cylinder 4 and the inner cylinder 3 are fixedly connected together by a connecting rod.

[0045] To guide the activated carbon in the inner cylinder 3 from the top of the outer cylinder 4 into the interior of the outer cylinder 4, a guide block 5 is provided at the top of the outer cylinder 4. A rotating rod 31 passes through the guide block 5 and is fixedly connected to it, allowing the guide block 5 to rotate with the rotating rod 31. The guide block 5 covers the inner cylinder 3 and leaves a gap between it and the top of the inner cylinder 3 for the activated carbon to pass through. The bottom surface of the guide block 5 has a guide arc surface 51, and the distance between the guide arc surface 51 and the outer wall of the inner cylinder 3 gradually increases from top to bottom. The guide arc surface 51 gradually bends downward towards the outer cylinder 4. When the activated carbon moves to the top of the inner cylinder 3, it can move along the guide arc surface 51 into the interior of the outer cylinder 4. The side wall of the guide block 5 contacts the inner wall of the outer cylinder 4 to prevent the activated carbon from falling out of the outer cylinder 4.

[0046] Reference Figures 3 to 6 The guide block 5 has four paddles 52 extending radially along the outer cylinder 4 on the guide arc surface 51. All paddles 52 protrude downwards and can rotate with the guide block 5. During circulation, the activated carbon can be continuously turned over by the rotating paddles 52, so that the activated carbon located in the inner layer can move to the outer layer during the circulation process, allowing the activated carbon in the inner and outer layers to exchange positions, which is more conducive to full adsorption.

[0047] Four receiving boxes 53 are fixedly positioned at intervals on the bottom edge of the guide block 5, away from the inner cylinder 3. Each receiving box 53 contains a crushing roller 54, and each crushing roller 54 has multiple crushing spikes fixed to its outer wall. The crushing rollers 54 are distributed around the inner cylinder 3. The crushing rollers 54 are placed vertically, and sliders 55 are rotatably connected to both their upper and lower ends. The side wall of the crushing roller 54 closest to the inner cylinder 3 extends out of the guide block 5, leaving space between it and the inner cylinder 3 for activated carbon to pass through. The distance between the side wall of the crushing roller 54 and the inner cylinder 3 can be set according to requirements. If a smaller volume of activated carbon is desired after crushing, the distance between the side wall of the crushing roller 54 and the inner cylinder 3 is reduced; if the volume of activated carbon after crushing is not too small, the distance between the side wall of the crushing roller 54 and the inner cylinder 3 is increased.

[0048] All sliders 55 are horizontally slidably connected within the receiving box 53. A return element 56, which can be a compression spring, is located between the slider 55 and the inner wall of the guide block 5. The return element 56 is horizontally placed, with one end fixedly connected to the side wall of the slider 55 and the other end fixedly connected to the inner wall of the guide block 5. When the crushing roller 54 crushes the activated carbon, due to the initially large volume of the activated carbon, the activated carbon moves between the crushing roller 54 and the inner cylinder 3, pressing the crushing roller 54 into the receiving box 53. Subsequently, it is pushed out by the restoring force generated by the return element 56, allowing the crushing roller 54 to reciprocate horizontally while rotating, which is more conducive to crushing the activated carbon.

[0049] To extend the service life of activated carbon, its surface is cleaned while it circulates. An annular duct 6 is fixed to the bottom inside the sealed cylinder 41, coaxially arranged with the sealed cylinder 41. The diameter of the annular duct 6 is larger than that of the outer cylinder 4, allowing it to surround the outer cylinder 4 from the bottom. The annular duct 6 can be connected to an external air supply device such as a hot air blower via a connecting pipe. Multiple air outlets 61 are spaced apart on the annular duct 6, with their outlets angled towards the bottom surface of the outer cylinder 4. In Embodiment 1 of this application, to facilitate the purging of the activated carbon, the bottom end of the outer cylinder 4 is a downward-convex arc surface. The outlets of the air outlets 61 face the arc surface at the bottom of the outer cylinder 4, and the arc surface at the bottom of the outer cylinder 4 further facilitates the movement of the activated carbon towards the spiral conveyor blades 32.

[0050] Furthermore, a retaining ring 7 is coaxially sleeved on the outer side of the outer cylinder 4 near its bottom end. The inner wall of the retaining ring 7 is slidably connected to the outer wall of the outer cylinder 4. A striking plate 71 is hinged to the bottom surface of the retaining ring 7. The axis of rotation of the striking plate 71 is perpendicular to the axis of the retaining ring 7, and the striking plate 71 can rotate towards or away from the bottom end of the outer cylinder 4. A striking block 72 is fixed on the inner side wall of the bottom end of the striking plate 71. The striking block 72 may be made of rubber. The retaining ring 7 is fixedly connected to the bottom end of the rotating rod 31 through a connecting rod 73. The connecting rod 73 is fitted against the bottom surface of the outer cylinder 4, so that the retaining ring 7 can rotate synchronously with the rotating rod 31 through the connecting rod 73.

[0051] Activated carbon gradually rises inside the inner cylinder 3 under the lifting action of the spiral conveyor blades 32. After reaching the top of the inner cylinder 3, it falls into the outer cylinder 4 under the guidance of the guide arc surface 51. Subsequently, the activated carbon gradually descends under its own gravity and gathers at the bottom of the outer cylinder 4. Finally, it is transported back into the inner cylinder 3 by the spiral conveyor blades 32, forming a complete cycle. During the reciprocating cycle, the activated carbon continuously flips itself, ensuring uniform adsorption on the surface of each piece. As the activated carbon moves from the inner cylinder 3 to the outer cylinder 4, the crushing roller 54 rotates synchronously with the guide block 5, continuously breaking large pieces of activated carbon into smaller fragments. This increases the surface area of ​​the activated carbon for adsorption, resulting in more thorough adsorption of waste gas. Furthermore, since the crushed activated carbon moves from top to bottom, the smaller pieces fall into the gaps between the larger pieces, filling these gaps and improving the adsorption effect of waste gas.

[0052] The air outlet pipe 61 surrounding the outer cylinder 4 can intermittently blow the bottom of the outer cylinder 4, which is beneficial for cleaning the surface of the activated carbon located at the bottom of the outer cylinder 4. The blown-off impurities fall into the closed cylinder 41. Since the activated carbon continuously circulates between the outer cylinder 4 and the inner cylinder 3, all activated carbon can be cleaned when it moves to the bottom of the outer cylinder 4, which can improve the service life of the activated carbon and reduce the frequency of activated carbon replacement. The striking plate 71 rotates with the fixed ring 7. When the striking plate 71 rotates to the position facing the air outlet of the air outlet pipe 61, the striking plate 71 is blown by the airflow from the air outlet pipe 61, which causes the striking plate 71 to drive the striking block 72 to hammer the surface of the outer cylinder 4. The outer cylinder 4 vibrates after being hammered, which helps to shake off the impurities adsorbed on the surface of the activated carbon. Furthermore, when the outer cylinder 4 vibrates, it is more conducive to smaller activated carbon particles falling into the gaps between larger activated carbon particles.

[0053] The implementation principle of the waste gas treatment equipment for calcium hydroxybenzenesulfonate production in Embodiment 1 of this application is as follows: Activated carbon gradually rises inside the inner cylinder 3 under the continuous conveying of the spiral conveyor blades 32 and falls into the outer cylinder 4, so that the activated carbon continuously circulates between the outer cylinder 4 and the inner cylinder 3, so that the surface of each piece of activated carbon can be uniformly adsorbed. In the process of activated carbon circulation, it is broken into smaller pieces by the crushing roller 54, which helps to increase the surface area of ​​activated carbon for adsorption, so that the adsorption of waste gas is more complete. While the exhaust pipe 61 blows the surface of activated carbon, it can also blow the striking plate 71 to drive the striking block 72 to hammer the outer cylinder 4, which helps to shake off the impurities adsorbed on the surface of activated carbon, and at the same time, it is more conducive to the smaller activated carbon falling into the gaps between the larger activated carbon. Example 2

[0054] Example 2 discloses a waste gas treatment device and process for calcium dobesilate production. The waste gas is treated using the same equipment as in Example 1, including the following steps:

[0055] S1: First, pre-cool the exhaust gas, then start the first exhaust gas treatment device and the second exhaust gas treatment device. Activated carbon needs to be added to the outer cylinder 4 and the inner cylinder 3, and the exhaust gas is introduced into the tower body 1 through the air inlet 12.

[0056] S2: The nozzle 2 rotates and sprays an alkaline solution to neutralize the waste gas and reduce the sulfur dioxide content in the waste gas. Then the treated waste gas enters the outer cylinder 4 upwards, where the reciprocating activated carbon adsorbs the waste gas and adsorbs the remaining impurities in the waste gas. Finally, the waste gas is discharged through the outlet 13.

[0057] S3: During the exhaust gas treatment process, the exhaust pipe 61 intermittently blows and cleans the activated carbon inside the outer cylinder 4, and the striking block 72 intermittently hammers the outer cylinder 4 to shake off impurities on the surface of the activated carbon, so as to extend the service life of the activated carbon.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waste gas treatment device for calcium hydroxybenzenesulfonate production, characterized in that: include The tower body is placed vertically and is hollow inside. The side wall of the tower body is provided with an air inlet and the top is provided with an air outlet. The first waste gas treatment device is located inside the tower and is used to spray alkaline solution onto the waste gas. The second waste gas treatment device is located above the first waste gas treatment device. The second waste gas treatment device includes an inner cylinder and an outer cylinder arranged coaxially. The outer cylinder is hollow and its inner diameter is larger than that of the inner cylinder. The top of the outer cylinder has an opening, while the bottom is closed and covers the bottom of the inner cylinder. The top and bottom of the inner cylinder both have openings. The internal spaces of the outer cylinder and the inner cylinder are used to hold activated carbon. The inner cylinder is equipped with a lifting mechanism to drive the activated carbon to rise continuously inside the inner cylinder. The top of the outer cylinder is equipped with a guiding and crushing mechanism to guide the activated carbon in the inner cylinder to enter the outer cylinder from the top of the outer cylinder, so that the activated carbon can reciprocate between the outer cylinder and the inner cylinder. The guiding and crushing mechanism is also used to crush the activated carbon. The guiding and crushing mechanism includes a guide block and a crushing roller. The guide block covers the inner cylinder and leaves a gap between itself and the top of the inner cylinder for activated carbon to pass through. The outer wall of the crushing roller is provided with multiple crushing spikes. Multiple crushing rollers are provided and spaced around the inner cylinder. The crushing roller rotates vertically at the bottom edge of the guide block away from the inner cylinder. The side wall of the crushing roller near the inner cylinder extends out of the guide block and leaves a space between itself and the inner cylinder for activated carbon to pass through. Both the upper and lower ends of the crushing roller are rotatably connected to sliders. The sliders are horizontally slidably connected inside the guide block. There is a return element between the slider and the inner wall of the guide block. The return element is placed horizontally, with one end connected to the side wall of the slider and the other end connected to the inner wall of the guide block. A cleaning mechanism is provided below the outer cylinder for blowing and cleaning the surface of the activated carbon as it passes.

2. The waste gas treatment equipment for calcium hydroxybenzenesulfonate production according to claim 1, characterized in that: The lifting mechanism includes a rotating rod and a spiral conveying blade. The spiral conveying blade is spirally wound around the outer wall of the rotating rod, and the edge of the spiral conveying blade is in close contact with the inner wall of the inner cylinder. The rotating rod is coaxially arranged with the inner cylinder, extends downward through the inner cylinder, and is rotatably connected to the outer cylinder. The spiral conveying blade extends downward into the outer cylinder.

3. The waste gas treatment equipment for calcium hydroxybenzenesulfonate production according to claim 2, characterized in that: The rotating rod passes through the guide block and is fixed to the guide block. The bottom surface of the guide block is provided with a guide arc surface. The distance between the guide arc surface and the outer wall of the inner cylinder gradually increases from top to bottom, and the guide arc surface gradually bends and extends downward towards the outer cylinder. The side wall of the guide block is in contact with the inner wall of the outer cylinder. The guide arc surface is provided with multiple paddles extending along the radial direction of the outer cylinder. All paddles protrude downward.

4. The waste gas treatment equipment for calcium hydroxybenzenesulfonate production according to claim 2, characterized in that: An enclosed cylinder is provided outside the outer cylinder. The enclosed cylinder is coaxially sleeved on the lower part of the outer cylinder. A sealing ring is provided at the top of the enclosed cylinder. The sealing ring is coaxially sleeved on the outside of the outer cylinder, and the outer wall of the sealing ring is sealed to the inner wall of the tower body. At the same time, the inner wall of the sealing ring is sealed to the outer wall of the outer cylinder. A gas guide groove is provided on the side wall of the enclosed cylinder, and the gas guide groove connects the inner and outer spaces of the enclosed cylinder.

5. The waste gas treatment equipment for calcium hydroxybenzenesulfonate production according to claim 4, characterized in that: The cleaning mechanism includes an annular air duct located at the bottom of the closed cylinder and coaxially arranged with the closed cylinder. The diameter of the annular air duct is larger than the diameter of the outer cylinder and is used to connect to an external air supply device. Multiple air outlet pipes are spaced apart on the annular air duct, and the air outlets of the air outlet pipes are all inclined towards the bottom surface of the outer cylinder.

6. The waste gas treatment equipment for calcium hydroxybenzenesulfonate production according to claim 5, characterized in that: A fixing ring is coaxially sleeved on the outer cylinder near the bottom end. The fixing ring is fixedly connected to the rotating rod through a connecting rod. A striking plate is hinged to the bottom surface of the fixing ring. The rotation axis of the striking plate is perpendicular to the axis of the fixing ring. A striking block is provided on the inner side wall of the bottom end of the striking plate. The air outlet pipe faces the surface of the striking plate away from the striking block.

7. The waste gas treatment equipment for calcium hydroxybenzenesulfonate production according to claim 1, characterized in that: The first waste gas treatment device includes a nozzle and a connecting shaft. The nozzle is hemispherical with its arc surface facing downwards. The connecting shaft is vertically inserted through the bottom of the tower body. The top of the connecting shaft is fixed to the nozzle. The connecting shaft is rotatably connected to the tower body. The connecting shaft is hollow inside. The top of the connecting shaft is connected to the nozzle, and the bottom is used for connecting an external liquid supply device. The air inlet is located below the nozzle.

8. A process for treating waste gas from the production of calcium hydroxybenzenesulfonate, characterized in that: The treatment of production waste gas using the calcium hydroxybenzenesulfonate production waste gas treatment equipment as described in any one of claims 1-7 includes the following steps: S1: First, pre-cool the exhaust gas, then start the first and second exhaust gas treatment devices. Activated carbon needs to be added to the outer and inner cylinders, and the exhaust gas is introduced into the tower body through the air inlet. S2: The nozzle rotates and sprays an alkaline solution to neutralize the waste gas and reduce the sulfur dioxide content in the waste gas. Then the treated waste gas enters the outer cylinder from the top, where the reciprocating activated carbon adsorbs the waste gas and also adsorbs the other impurities in the waste gas. Finally, the waste gas is discharged through the outlet. S3: During the waste gas treatment process, the cleaning mechanism intermittently cleans the activated carbon inside the outer cylinder to extend the service life of the activated carbon.

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