A water washing dust removal system for protecting catalyst activity in hydrogen peroxide production

Abstract

The present application relates to the technical field of removing alumina powder in the white clay bed of hydrogen peroxide process, specifically, comprising water washing dust collector, washing water circulating pump, micro-fine dust filter, ultra-fine dust filter and control flow valve, pipeline and the like; wherein the key equipment water washing dust collector is involved, wherein the water washing dust collector comprises working liquid inlet and cleaning water outlet arranged at the bottom of the water washing dust collector, working liquid outlet arranged at the top of the water washing dust collector, and cleaning water distribution pipe located in the water washing dust collector, cleaning water spray head is arranged in annular array on the cleaning water distribution pipe, the cleaning water spray head is inclined to spray towards the central axis of the water washing dust collector, the content of alumina powder in the working liquid is greatly reduced by accurate washing of the working liquid, thereby reducing the plugging of the hydrogenation catalyst surface micropore, maintaining the stability of the catalyst activity, avoiding the reaction temperature rise and the associated lock problem caused by the decrease of the catalyst activity.

Description

Technical Field

[0001] This invention relates to the field of alumina powder removal technology in hydrogen peroxide production, and more specifically, to a water washing dust removal system for protecting catalyst activity in hydrogen peroxide production. Background Technology

[0002] In the field of hydrogen peroxide production, China currently mainly adopts fixed-bed hydrogen peroxide production technology, among which the fully acidic fixed-bed hydrogen peroxide production process is widely used. However, this process faces many problems related to alumina powder in actual operation, which seriously affect the stability of production, cost control and product quality.

[0003] In the hydrogen peroxide production process, the following three measures were taken to ensure the removal of alumina powder from the surface of the activated alumina balls:

[0004] 1. When the activated alumina balls are loaded into the clay bed, install the axial flow fan at the upper manhole of the clay bed. The alumina dust that is raised from the surface of the alumina balls the instant the activated alumina balls are loaded into the clay bed is drawn out of the clay bed by the axial flow fan.

[0005] 2. After the alumina balls are filled, a portion of the working fluid is introduced from the working fluid outlet pipe at the bottom or top of the clay bed. The viscosity of the working fluid can be used to draw the alumina powder adsorbed on the surface of the alumina balls into the working fluid. Then, this portion of the contaminated working fluid is withdrawn and sent to the preparation tank for washing (stirring) to remove the alumina powder before it is ready for use.

[0006] 3. After the white clay bed is processed in the first two steps and then incorporated into the system, a two-stage filtration system is added after the white clay bed. The first-stage filter is designed with a filtration accuracy of 2~3μm, and the second-stage filter is designed with a filtration accuracy of 1μm.

[0007] However, the alumina powder carried by the working fluid (especially fine particles with a particle size ≤1μm) has strong adsorption and dispersibility. Existing removal measures are difficult to completely remove due to limitations in their technical principles. The specific limitations are as follows:

[0008] In measure 1, the method relies on the airflow impact force to peel off the powder. The alumina powder particles are relatively large and easy to separate from the alumina balls. However, the fine particles are extremely light and have strong adsorption force, making it difficult for the airflow to effectively remove them from the alumina balls.

[0009] In Measure 2, the working fluid entering the clay bed is not fluid (or its fluidity is too slow) and cannot dislodge the alumina powder adsorbed on the surface of the alumina balls. It can only adsorb a small amount of alumina powder by its own viscosity.

[0010] In measure 3, it is considered that if the filter accuracy is too high, the flow rate will be reduced, and there will be too many filters, resulting in too much investment in filters and too frequent replacement of filter elements, which will lead to too high labor costs for replacing filter elements. Secondly, if the alumina powder is too fine, it will easily form a colloid with the working fluid, which is difficult to remove by filtration.

[0011] Due to the limitations of the three measures, the treatment of fine alumina powder (fine particles with a particle size ≤1μm) is incomplete, and residual powder will still enter the hydrogenation tower with the working fluid. Summary of the Invention

[0012] The purpose of this invention is to provide a water-washing dust removal system for protecting the activity of catalysts in hydrogen peroxide production. The working fluid enters the working fluid distributor from the bottom of the water-washing dust collector. The stirring mechanism, rotating rod, circular plate, extension rod, and actuating plate in the water-washing dust collector cooperate with the lever of the water control valve. When the rotation speed of the rotating rod changes, the actuating plate can contact the lever under the action of centrifugal force, dynamically adjusting the flow rate of the cleaning water. This structure can adaptively adjust the cleaning intensity according to the alumina powder content in the working fluid, enhance the mixing effect of the working fluid and the cleaning water, and thus more thoroughly remove alumina powder, solving the problem that traditional dynamic rinsing and fine filtration cannot remove fine alumina powder.

[0013] To achieve the above objectives, a water washing dust removal system for protecting catalyst activity in hydrogen peroxide production is provided, comprising a water washing dust collector, a washing water circulation pump, a fine dust filter, an ultrafine dust filter, and flow control valves and pipelines.

[0014] The bottom of the water-washing dust collector is connected to a wash water outlet pipe, which is connected to the inlet of a wash water circulation pump. The outlet of the wash water circulation pump is connected to the inlet of a fine dust filter, the outlet of the fine dust filter is connected to the inlet of an ultrafine dust filter, and the outlet of the ultrafine dust filter is connected to the wash water inlet pipe. A flow regulating valve group is installed between the outlet of the ultrafine dust filter and the wash water inlet pipe to control the amount of wash water entering the water-washing dust collector. The cleaned wash water after two stages of treatment is led to the outside as absorption water through a pipeline via the control valve group. A fresh water supply pipeline and a flow regulating valve group are installed between the flow regulating valve group and the water-washing dust collector to replenish the system's wash water.

[0015] The top of the water washing dust collector is equipped with a working fluid outlet, the bottom of the water washing dust collector is equipped with a cleaning water outlet, and a cleaning water distribution pipe is located inside the water washing dust collector. The cleaning water nozzles are arranged in a ring array on the cleaning water distribution pipe.

[0016] The bottom of the water-washing dust collector is equipped with a working fluid inlet pipe, which has a working fluid nozzle and an inner pipe, and an auxiliary nozzle is installed on the inner pipe.

[0017] The spatial arrangement and spray direction of the cleaning water distribution pipe and the working fluid inlet pipe are configured as follows:

[0018] The cleaning water nozzles are tilted towards the central axis of the water-washing dust collector to spray water in a cone-shaped water curtain from top to bottom.

[0019] The working fluid nozzles and auxiliary nozzles are arranged alternately and sprayed at opposite angles, so that the working fluid forms an umbrella-shaped vortex from bottom to top;

[0020] The conical water curtain and the umbrella-shaped vortex converge in the middle of the water washing dust collector, forming a composite flow field that enhances the contact between the two phases.

[0021] As a further innovation of this technical solution, the working fluid inlet pipe is equipped with a working fluid nozzle and an inner pipe, and the inner pipe is equipped with an auxiliary nozzle. The upper side of the water washing dust collector is connected to a cleaning water inlet pipe, one end of which extends into the inner cavity of the water washing dust collector. A water control valve is provided on the surface of the end of the cleaning water inlet pipe that extends into the inner cavity of the water washing dust collector. The cleaning water distribution pipe is fixed to the inner wall of the water washing dust collector by a first fixing ring, and the spray direction of the cleaning water nozzle is inclined towards the central axis of the water washing dust collector.

[0022] As a further innovation of this technical solution, the working fluid outlet pipe is fixed to the inner wall of the water washing dust collector by the second fixing plate. The working fluid outlet pipe is provided with an inner pipe, which is connected to the working fluid outlet pipe by a connecting rod. An auxiliary nozzle is provided on the inner pipe.

[0023] As a further innovation of this technical solution, the auxiliary nozzle and the working fluid nozzle are arranged alternately to form a composite flow field of umbrella-shaped swirling flow of the working fluid, which is fully mixed with the water flow above.

[0024] As a further innovation of this technical solution, the water washing dust collector is equipped with a stirring mechanism, which includes a motor, a rotating rod, and stirring blades. The motor is located outside the water washing dust collector, and the output end of the motor is fixedly connected to a rotating rod through a coupling. The rotating rod extends into the inner cavity of the water washing dust collector, and a second bevel gear is fixedly connected to one end of the rotating rod extending into the inner cavity of the water washing dust collector. A first bevel gear is fixedly connected to the bottom end of the rotating rod. The rotating rod and the water washing dust collector are connected by a transmission through the meshing of the first and second bevel gears. The rotating rod is equipped with stirring blades for fully mixing the working fluid and the cleaning water.

[0025] As a further innovation of this technical solution, the rotating rod is provided with a circular plate, the circular plate has a movable groove, the movable groove is provided with an extension rod, a spring is connected between the extension rod and the movable groove, and a toggle plate is provided at the end of the extension rod.

[0026] As a further innovation of this technical solution, the water control valve is equipped with a lever. The rotation angle of the lever controls the opening and closing of the water control valve. When the rotation speed of the lever is small, the actuating plate does not contact the lever, and the cleaning water flow is small. When the rotation speed of the lever is large, the actuating plate contacts the lever under the action of centrifugal force, and the cleaning water flow becomes larger.

[0027] As a further innovation of this technical solution, the inner wall of the water-washing dust collector is provided with multiple limiting rods, including a first limiting rod, a second limiting rod, a third limiting rod and a fourth limiting rod, and the ends of the limiting rods all point to the central axis of the water-washing dust collector.

[0028] As a further innovation of this technical solution, a support grid plate is provided at the lower part of the interior of the water-washing dust collector, and oil-water separation packing is installed on the support grid plate. A pressure plate is installed above the oil-water separation packing. Screws are connected near the inner wall of the water-washing dust collector to prevent the packing from being dispersed when the working fluid floats up. Here, the function of the oil-water separation packing is to prevent the separation of large free water droplets entrained in the working fluid when it floats up. An anti-swirl cross plate is installed in the inner cavity of the water-washing dust collector and above the washing water outlet to prevent the washing water from carrying the working fluid out of the water-washing dust collector.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. In a water-washing dust removal system for protecting catalyst activity in hydrogen peroxide production, the stirring mechanism of the equipment, a rotating rod, a circular plate, an extension rod, a deflector plate, and a deflector rod of the water control valve cooperate. When the rotation speed of the rotating rod changes, the deflector plate can contact the deflector rod under the action of centrifugal force, dynamically adjusting the cleaning water flow rate. This structure can adaptively adjust the cleaning intensity according to the alumina powder content in the working fluid, enhance the mixing effect of the working fluid and the cleaning water, thereby more thoroughly removing alumina powder, reducing its clogging of the micropores on the surface of the hydrogenated catalyst, maintaining the stability of catalyst activity, and avoiding the increase in reaction temperature and related interlocking problems caused by the decrease in catalyst activity.

[0031] 2. In this water-washing dust removal system for protecting catalyst activity in hydrogen peroxide production, the working fluid and cleaning water distribution pipes are designed such that the inner pipe of the working fluid outlet pipe, the auxiliary nozzles, and the cleaning water nozzles of the cleaning water distribution pipe are arranged in an alternating manner to form a composite flow field of umbrella-shaped swirl. This structure increases the contact area and contact time between the working fluid and the cleaning water, improves the uniformity of the two-phase mixing, and can efficiently wash the alumina powder in the working fluid, reduce the amount of powder entering the hydrogenation tower, thereby reducing the risk of catalyst activity decay caused by powder adhesion, stabilizing the operating conditions of subsequent processes such as the extraction tower, and reducing the frequency of production adjustments.

[0032] 3. This water-washing dust removal system for protecting catalyst activity in hydrogen peroxide production utilizes a system where the working fluid containing alumina powder is mixed with wash water (note: pure water, being polar, adsorbs fine alumina powder). The alumina powder then enters the wash water, which is pumped into a fine dust filter and an ultrafine dust filter. The fine dust filter first removes alumina powder particles larger than 0.1µm (because the wash water is neutral, alumina powder easily binds and is filtered out). The ultrafine dust filter typically uses a backwashing osmosis membrane filter. When the wash water containing ultrafine alumina powder passes through the osmosis membrane, water molecules pass through to form new wash water, while larger molecules that do not pass through are directly discharged for wastewater treatment. After treatment by this system, the amount of alumina powder entering the working fluid of the hydrogenation tower is significantly reduced, ensuring that the catalyst activity is no longer affected by alumina powder and greatly extending the catalyst's lifespan.

[0033] 4. In this water-washing dust removal system for protecting catalyst activity in hydrogen peroxide production, during the countercurrent contact between the washing water and the working fluid, most of the hydrogen peroxide in the working fluid is absorbed into the washing water, causing the hydrogen peroxide content in the washing water to gradually increase. Then, based on the concentration of hydrogen peroxide in the washing water, some fresh pure water is added, and some of the hydrogen peroxide-containing washing water is sent to the oxidation process as absorption water to improve the oxidation yield. Thus, some hydrogen peroxide can be recovered, thereby increasing the overall yield of hydrogen peroxide in the unit. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 This is an internal schematic diagram of the structure of the water-washing dust collector of the present invention;

[0036] Figure 3 This is a cross-sectional view of the structure of the water-washing dust collector of the present invention;

[0037] Figure 4 This is a schematic diagram of the cleaning water distribution pipe of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of the stirring blade of the present invention;

[0039] Figure 6 This is a cross-sectional view of the circular plate structure of the present invention;

[0040] Figure 7 This is a schematic diagram of the working fluid outlet pipe of the present invention;

[0041] Figure 8 This is a schematic diagram of the anti-rotation cross plate of the present invention;

[0042] Figure 9 This is a schematic diagram of the structure of the pressure plate of the present invention;

[0043] Figure 10 This is an overall system diagram of the hydrogen peroxide production process of the present invention.

[0044] In the diagram: 1. Water-washing dust collector; 2. Working fluid outlet; 3. Cleaning water outlet; 4. Cleaning water distribution pipe; 5. First fixing ring; 6. Cleaning water nozzle; 7. Cleaning water inlet pipe; 8. Water control valve; 9. Lever; 10. Working fluid inlet pipe; 11. Second fixing plate; 12. Working fluid inlet pipe; 13. Connecting rod; 14. Inner pipe; 15. Working fluid nozzle; 16. Auxiliary nozzle; 17. First limiting rod; 18. Second limiting rod; 19. Third limiting rod; 20. Fourth limiting rod; 21. First bevel gear; 22. Motor; 23. 24. Rotating rod; 25. Second bevel gear; 26. Stirring blade; 27. Circular plate; 28. Movable groove; 29. ​​Spring; 20. Extension rod; 31. Actuating plate; 32. Anti-rotation cross plate; 33. Support leg; 34. Pressure plate; 35. Oil-water separation packing; 36. Support grid plate; 38. Rotating rod; 39. Wash water outlet pipe; 40. Wash water circulation pump; 41. Flow regulating valve assembly; 43. Fine dust filter; 44. Variable frequency transfer pump; 45. Level transmitter; 46. Ultrafine dust filter; 47. Flow transmitter; 48. Intelligent controller. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] This invention provides a water-washing dust removal system for protecting the activity of catalysts in hydrogen peroxide production. This water-washing dust removal system for protecting the activity of catalysts in hydrogen peroxide production includes the following components:

[0049] Please see Figures 1-10 As shown, it includes a water washing dust collector 1, a washing water circulation pump 40, a fine dust filter 43, an ultrafine dust filter 46, and flow control valves, pipelines, etc.

[0050] The bottom of the washing dust collector 1 is connected to a washing water outlet pipe 39, which is connected to the inlet of a washing water circulation pump 40. The outlet of the washing water circulation pump 40 is connected to the inlet of a fine dust filter 43, the outlet of the fine dust filter 43 is connected to the inlet of an ultrafine dust filter 46, and the outlet of the ultrafine dust filter 46 is connected to a washing water inlet pipe. A flow regulating valve group 41 is installed between the outlet of the ultrafine dust filter 46 and the washing water inlet pipe to control the amount of washing water entering the washing dust collector 1. The washing water that has been treated in two stages is led to the outside as absorption water through a pipeline via the control valve group. A fresh water supply pipeline and a flow regulating valve group are installed between the flow regulating valve group 41 and the washing dust collector 1 to replenish the washing water of the system.

[0051] One end of the wash water outlet pipe 39 is connected to a variable frequency delivery pump 44 via a drain pipe. A fine dust filter 43 is connected to the variable frequency delivery pump 44 via a pipe. A water inlet is provided on the top side wall of the fine dust filter 43, and a level transmitter 45 is connected to the side wall. The wash water circulation pump 40 includes a flow transmitter 47 and an intelligent controller 48.

[0052] The interface of this water-washing dust collector is controlled by the water supply and output. When the amount of pure water added to the system is greater than the amount of washing water delivered, the interface of the water-washing dust collector gradually rises. This can be observed remotely and on-site using an interface meter, or further confirmed using a sight glass. When the amount of pure water added to the system is less than the amount of washing water delivered, the interface of the water-washing dust collector gradually descends. Normal operation requires analysis and monitoring of the hydrogen peroxide content in the washing water (which is absorbed from the working fluid during the washing process) to prevent excessive hydrogen peroxide content in the washing water from being carried to the hydrogenation tower via the working fluid, causing the risk of excessive hydrogen peroxide decomposition and explosion.

[0053] The top of the water washing dust collector 1 is provided with a working fluid outlet 2, the bottom of the water washing dust collector 1 is provided with a cleaning water outlet 3, and a cleaning water distribution pipe 4 is located inside the water washing dust collector 1. The cleaning water distribution pipe 4 is provided with a ring array of cleaning water nozzles 6, which are arranged in a ring array on the cleaning water distribution pipe 4. The bottom of the water washing dust collector 1 is provided with a working fluid inlet pipe 10, which is provided with a working fluid nozzle 15 and an inner pipe 14. The inner pipe 14 is provided with an auxiliary nozzle 16. One side of the water washing dust collector 1 is connected to a cleaning water inlet pipe 7, one end of which extends into the inner cavity of the water washing dust collector 1. A water control valve 8 is provided on the surface of the end of the cleaning water inlet pipe 7 that extends into the inner cavity of the water washing dust collector 1.

[0054] The spatial arrangement and spray direction of the cleaning water distribution pipe 4 and the working fluid inlet pipe 10 are configured as follows:

[0055] The cleaning water nozzle 6 sprays water at an angle toward the central axis of the water washing dust collector 1, forming a cone-shaped water curtain from top to bottom.

[0056] The working fluid nozzle 15 and the auxiliary nozzle 16 are arranged in an alternating manner and sprayed at opposite angles, so that the working fluid forms an umbrella-shaped swirling flow from bottom to top.

[0057] The conical water curtain and the umbrella-shaped vortex converge in the middle of the water washing dust collector 1, forming a composite flow field that enhances the contact between the two phases.

[0058] The water-washing dust collector 1 is a cylindrical cavity with closed ends. It serves as the mixing and stirring container for the entire system. Its function is to provide an independent and enclosed space for the mixing, washing, and separation of the working fluid and the cleaning water. The necessity of this structure is to prevent the working fluid and cleaning water from leaking out during the treatment process and to prevent alumina powder from spreading with the liquid and causing secondary pollution. At the same time, the enclosed cavity can ensure stable internal pressure and provide a stable installation benchmark for each functional component. The support legs 32 at the bottom of the water-washing dust collector 1 are symmetrically distributed. Their function is to suspend the water-washing dust collector 1 in the air, avoiding corrosion or vibration interference caused by direct contact between the bottom and the ground, ensuring that the water-washing dust collector 1 remains stable during operation and providing a stable environment for internal liquid treatment.

[0059] The top of the water-washing dust collector 1 is equipped with a working fluid outlet 2 and a cleaning water inlet pipe 7. The working fluid outlet 2 is used to discharge the working fluid that has been used to remove alumina powder after washing, and the cleaning water inlet pipe 7 is used to introduce the clean washing water after treatment. The working fluid outlet 2 is usually located at the top and the cleaning water inlet pipe 7 is located at the bottom. Combined with the internal separation structure, the clean liquid can be discharged upwards and the turbid liquid can be discharged downwards, avoiding the separation of the clean working fluid and the wastewater containing impurities, thus ensuring the separation effect.

[0060] The cleaning water distribution pipe 4 is fixed to the inner wall of the washing dust collector 1 by the first fixing ring 5, and the spray direction of the cleaning water nozzle 6 is inclined towards the central axis of the washing dust collector 1. The working fluid inlet pipe 10 is fixed to the inner wall of the washing dust collector 1 by the second fixing plate 11. The working fluid inlet pipe 10 is provided with an inner pipe 14, which is connected to the working fluid inlet pipe 10 by a connecting rod 13. The inner pipe 14 is provided with an auxiliary nozzle 16. The auxiliary nozzle 16 and the working fluid nozzle 15 are arranged alternately to form a composite flow field of umbrella-shaped swirling flow of the working fluid, which is fully mixed with the water flow above.

[0061] The cleaning water distribution pipe 4 is an annular pipe, fixed to the inner wall of the water washing dust collector 1 by the first fixing ring 5. The pipe is equipped with cleaning water nozzles 6, which are arranged in a ring array and the spray direction is inclined towards the central axis of the water washing dust collector 1. After the cleaning water enters the distribution pipe from the cleaning water inlet pipe 7, it is sprayed towards the central axis by the inclined cleaning water nozzles 6. The inclined design makes the water flow form a centripetal convergence trend. The ring array of multiple nozzles can cover most of the cross-section of the water washing dust collector 1, ensuring that the contact area between the cleaning water and the working fluid is maximized. Compared with vertical spraying, inclined spraying can form an initial swirling flow, laying the foundation for subsequent mixing with the working fluid. By expanding the contact area and guiding the water flow direction, the cleaning water's ability to clean alumina powder in the working fluid is improved, and the washing effect is initially enhanced.

[0062] The working fluid inlet pipe 10 is an annular pipe, fixed to the inner wall of the water washing dust collector 1 by the second fixing plate 11. An inner pipe 14 is installed inside the pipe, and the inner pipe 14 is connected to the distribution pipe via a connecting rod 13. An auxiliary nozzle 16 is installed on the inner pipe 14, and a working fluid nozzle 15 is located outside the distribution pipe. The auxiliary nozzle 16 and the working fluid nozzle 15 are arranged alternately. After the working fluid enters the distribution pipe from the working fluid inlet pipe 12, part of it is sprayed outwards through the outer working fluid nozzle 15, and the other part is sprayed inwards through the inner pipe 14 and the auxiliary nozzle 16. The staggered arrangement creates an outward expansion and inward contraction of the two water streams, forming a composite flow field of umbrella-shaped swirling flow. This flow field structure breaks the laminar flow state of the liquid, allowing the working fluid and the cleaning water above to mix fully during collision and rotation. The swirling flow prolongs the contact time of the liquid, and the umbrella-shaped distribution expands the contact area, solving the problem of insufficient contact in traditional spraying. This significantly improves the transfer efficiency of alumina powder from the working fluid to the cleaning water, reduces the residue of fine particles, and lowers the risk of them entering the hydrogenation tower and clogging the catalyst micropores.

[0063] The water-washing dust collector 1 is equipped with a stirring mechanism, which includes a motor 22, a rotating rod 38, and stirring blades 25. The motor 22 is located outside the water-washing dust collector 1. The output end of the motor 22 is fixedly connected to a rotating rod 23 via a coupling. The rotating rod 23 extends into the inner cavity of the water-washing dust collector 1. A second bevel gear 24 is fixedly connected to one end of the rotating rod 23 extending into the inner cavity of the water-washing dust collector 1. A first bevel gear 21 is fixedly connected to the bottom end of the rotating rod 38. The rotating rod 38 and the water-washing dust collector 1 are connected by a transmission through the meshing of the first bevel gear 21 and the second bevel gear 24. The rotating rod 38 is equipped with... The stirring blade 25 is used to fully mix the working fluid and the cleaning water. A circular plate 26 is provided on the rotating rod 38. A movable groove 27 is opened on the circular plate 26. An extension rod 29 is provided in the movable groove 27. A spring 28 is connected between the extension rod 29 and the movable groove 27. A toggle plate 30 is provided at the end of the extension rod 29. A lever 9 is provided on the water control valve 8. The rotation angle of the lever 9 controls the opening and closing of the water control valve 8. When the rotation speed of the rotating rod 38 is low, the toggle plate 30 does not contact the lever 9, and the water flow of the cleaning water is small. When the rotation speed of the rotating rod 38 is high, the toggle plate 30 contacts the lever 9 under the action of centrifugal force, and the water flow of the cleaning water increases.

[0064] The stirring mechanism includes a motor 22, a rotating rod 23, a rotating rod 38, and stirring blades 25. The motor 22 is located outside the water washing dust collector 1, and its output end is connected to the rotating rod 23 via a coupling. The rotating rod 23 extends into the water washing dust collector 1 and meshes with the first bevel gear 21 at the bottom of the rotating rod 38 via a second bevel gear 24. The rotating rod 38 is equipped with stirring blades 25. In addition, the rotating rod 38 is equipped with a circular plate 26, which has a movable groove 27. An extension rod 29 is connected to the groove via a spring 28. The end of the extension rod 29 is equipped with a toggle plate 30, which cooperates with the toggle lever 9 on the water control valve 8. The motor 22 drives the rotating rod 23 to rotate, and the rotating rod 38 and stirring blades 25 are driven to rotate via bevel gear transmission. The rotation of the stirring blades 25 can further break the stratification of the working fluid and the cleaning water, and extend the local mixing formed by the composite flow field to the entire space of the water washing dust collector 1, so that the alumina powder is evenly dispersed in the liquid, making it easier to be cleaned by the cleaning water.

[0065] When the alumina powder content in the working fluid is high, the system needs to increase the cleaning water flow rate to enhance the washing capacity. At this time, the speed of motor 22 increases, and the speed of rotating rod 38 and circular plate 26 increases synchronously. Under the action of centrifugal force, extension rod 29 overcomes the elastic force of spring 28 and extends outward along movable groove 27, driving the actuating plate 30 to contact the lever 9 of water control valve 8, pushing lever 9 to rotate to increase the opening of water control valve 8, thereby increasing the cleaning water flow rate. Conversely, when the powder content is low, the speed decreases, the centrifugal force decreases, spring 28 pulls extension rod 29 back, actuating plate 30 separates from lever 9, water control valve 8 opening decreases, and the flow rate decreases. This linkage structure realizes adaptive adjustment of powder content, speed, and water volume without manual intervention, dynamically matching washing intensity and impurity content, ensuring the removal effect under high powder conditions, avoiding water waste under low powder conditions, and further improving mixing efficiency through thorough stirring, reducing the risk of catalyst contamination.

[0066] The inner wall of the water-washing dust collector 1 is provided with multiple limiting rods, including a first limiting rod 17, a second limiting rod 18, a third limiting rod 19, and a fourth limiting rod 20. The ends of the limiting rods all point to the central axis of the water-washing dust collector 1. The function of these limiting rods is to limit the range and intensity of the liquid swirling, and to avoid liquid splashing or uneven local mixing due to excessively violent swirling. The limiting rods can form a certain resistance to the high-speed rotating liquid, guide the liquid to flow along a predetermined path, and make the mixing process more controllable. At the same time, the limiting rods can also provide turbulence points for the liquid flow, enhance local turbulence, and help improve the mixing effect.

[0067] Inside the water-washing dust collector 1, a support grid 36 is provided at the top. Oil-water separation packing 35 is installed on the support grid 36, and a pressure plate 33 is mounted above the oil-water separation packing 35. The pressure plate 33 is connected to the inner wall of the water-washing dust collector 1 by screws to prevent the packing from being dispersed when the working fluid rises. Here, the function of the oil-water separation packing 35 is to prevent the separation of large, free water droplets entrained in the working fluid when it rises.

[0068] An anti-rotation cross plate 31 is installed in the inner cavity of the water washing dust collector 1 and above the cleaning water outlet 3. The anti-rotation cross plate 31 is located in the inner cavity of the water washing dust collector 1 and above the cleaning water outlet 3. Its function is to suppress the rotational movement of the liquid at the outlet and carry the working fluid droplets out in a rotating manner. The cross plate can break the rotational inertia through physical obstruction, so that the liquid flows out smoothly and ensures that the washing water discharged from the cleaning water outlet 3 carries as few working fluid oil droplets as possible, thereby improving the efficiency of water washing dust removal.

[0069] The process begins with the working fluid extracted from the bleaching bed. After being treated by the bleaching bed, the working fluid carries trace amounts of alumina powder. After passing through two-stage filters, it is transported to the water washing dust removal system. After entering the water washing dust collector 1 of the water washing dust removal system, the working fluid enters the working fluid inlet pipe 10 through the working fluid inlet pipe 12. It forms an umbrella-shaped vortex through the working fluid nozzle 15 and the auxiliary nozzle 16 of the inner pipe 14, expanding the contact area with the cleaning water. The cleaning water enters the cleaning water distribution pipe 4 through the cleaning water inlet pipe 7 with the water control valve 8. It is then sprayed obliquely towards the central axis through the ring array of cleaning water nozzles 6 to form a centripetal water flow. This forms a composite flow field with the working fluid vortex, efficiently mixing and washing away the alumina powder in the working fluid.

[0070] Dynamic adjustment: If the alumina powder content in the working fluid is high, the system increases the rotation speed of the stirring mechanism motor 22 driving the rotating rod 38 and stirring blade 25, and uses centrifugal force to push the lever 9 of the water control valve 8 through the actuating plate 30, thereby increasing the flow rate of the cleaning water and strengthening the washing; otherwise, the flow rate is automatically reduced to achieve precise purification and separation discharge: The purified working fluid is discharged through the working fluid outlet 2, and the wastewater carrying impurities is discharged through the anti-swirl cross plate 31 above the cleaning water outlet 3 to stabilize the flow.

[0071] The purified working fluid enters the regeneration liquid storage tank, and then is pressurized and transported to the hydrogenation tower by the working fluid pump. Because the pre-filter and water washing dust removal system have removed most of the alumina powder, the alumina powder is prevented from clogging the micropores on the surface of the hydrogenation catalyst, ensuring the stability of the catalyst activity. This allows the hydrogenation reaction to proceed at a suitable temperature, preventing excessively high hydrogenation temperatures from causing severe degradation of anthraquinone and affecting the stability of subsequent processes.

[0072] Working principle: The working fluid enters the working fluid inlet pipe 10 through the working fluid inlet pipe 12, and forms an umbrella-shaped vortex through the working fluid nozzle 15 and the auxiliary nozzle 16 of the inner pipe 14; the cleaning water enters the cleaning water distribution pipe 4 through the cleaning water inlet pipe 7 and the water control valve 8, and is sprayed towards the center through the inclined cleaning water nozzle 6. The two liquids are initially mixed inside the water washing dust collector 1 by swirling and colliding. After the two phases are fully mixed, the fine alumina powder is adsorbed by the polar solvent and detaches from the working fluid and enters the washing water.

[0073] When the motor 22 starts, it drives the rotating rod 38 and the stirring blade 25 to rotate through the meshing transmission of the rotating rod 23, the first bevel gear 21 and the second bevel gear 24. The stirring blade 25 breaks up the liquid stratification, so that the mixing range is extended to the entire water washing dust collector 1. At the same time, the limiting rod guides the liquid flow, enhances local turbulence, and further improves the washing efficiency of alumina powder.

[0074] When the alumina powder content in the working fluid is high, the system increases the stirring intensity by increasing the speed of motor 22; at this time, the speed of circular plate 26 on rotating rod 38 increases synchronously, and extension rod 29 extends under the action of centrifugal force, driving the actuating plate 30 to push the lever 9 of water control valve 8 to increase the cleaning water flow rate to match high washing demand; conversely, it automatically reduces the flow rate to achieve dynamic adaptation.

[0075] After thorough mixing and washing, the working fluid flows upward and enters the oil-water separation packing 35 through the pressure plate 33. Under the action of the oil-water separation packing 35, the oil and water are separated. The clean working fluid after separation flows upward and is discharged through the working fluid outlet 2. The washing water containing alumina powder flows downward and is discharged smoothly through the cleaning water outlet 3 under the action of the anti-rotation cross plate 31.

[0076] 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 preferred examples and are not intended to limit the invention. Various changes and innovations can be made without departing from the spirit and scope of the invention, and all such changes and innovations fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water washing dust removal system for protecting the activity of a catalyst for hydrogen peroxide production, characterized by: The utility model relates to a water washing dust collector (1), washing water circulating pump (40), fine dust filter (43), superfine dust filter (46) and control flow valve, pipeline are contained, it is characterized by: The bottom of the water washing dust collector (1) is connected with a washing water outlet pipe (39), the washing water outlet pipe (39) is communicated with the inlet of a washing water circulating pump (40), the outlet of the washing water circulating pump (40) is connected with the inlet of a fine dust filter (43), the outlet of the fine dust filter (43) is connected with the inlet of a superfine dust filter (46), the outlet of the superfine dust filter (46) is connected with a washing water inlet pipe, wherein a flow regulating valve group (41) is arranged between the outlet of the superfine dust filter (46) and the washing water inlet pipe to control the amount of washing water entering the water washing dust collector (1); the clean washing water after two-stage treatment is led to the outside as absorption water through a pipeline controlled by the valve group, a fresh water adding pipeline and a flow control valve group are arranged between the flow regulating valve group (41) and the water washing dust collector (1) to supplement the washing water in the system; The top of the water washing dust collector (1) is provided with a working liquid outlet (2), the bottom of the water washing dust collector (1) is provided with a cleaning water outlet (3), and a cleaning water distribution pipe (4) is arranged in the water washing dust collector (1), and cleaning water nozzles (6) are arranged in an annular array on the cleaning water distribution pipe (4); The bottom of the water washing dust collector (1) is provided with a working liquid inlet pipe (10), the working liquid inlet pipe (10) is provided with a working liquid nozzle (15) and an inner pipe (14), and the inner pipe (14) is provided with an auxiliary nozzle (16); The spatial arrangement and jetting directions of the cleaning water distribution pipe (4) and the working liquid inlet pipe (10) are configured as follows: The cleaning water nozzles (6) are inclined to jet towards the central axis of the water washing dust collector (1) to form a conical water curtain from top to bottom; The working liquid nozzle (15) and the auxiliary nozzle (16) are arranged alternately and jet reversely to form an umbrella-shaped rotational flow of working liquid from bottom to top; The conical water curtain and the umbrella-shaped rotational flow intersect in the middle of the water washing dust collector (1) to form a composite flow field for enhancing two-phase contact.

2. The water washing dust removal system for protecting the activity of a catalyst for hydrogen peroxide production according to claim 1, characterized by: One side of the upper part of the water washing dust collector (1) is communicated with a cleaning water inlet pipe (7), one end of the cleaning water inlet pipe (7) extends into the inner cavity of the water washing dust collector (1), a water control valve (8) is arranged on the surface of the end of the cleaning water inlet pipe (7) extending into the inner cavity of the water washing dust collector (1), the cleaning water distribution pipe (4) is fixed to the inner wall of the water washing dust collector (1) through a first fixing ring (5), and the jetting directions of the cleaning water nozzles (6) are inclined to the central axis of the water washing dust collector (1).

3. The water washing dust removal system for protecting the activity of a catalyst for hydrogen peroxide production according to claim 2, characterized by: The working liquid inlet pipe (10) is fixed to the inner wall of the water washing dust collector (1) through a second fixing plate (11), the inner pipe (14) is arranged in the working liquid inlet pipe (10), the inner pipe (14) is connected with the working liquid inlet pipe (10) through a communication rod (13), and the auxiliary nozzle (16) is arranged on the inner pipe (14).

4. The water washing dust removal system for protecting the activity of a catalyst for hydrogen peroxide production according to claim 2, characterized by: The water washing dust collector (1) is internally provided with a stirring mechanism, the stirring mechanism comprises a motor (22), a rotating rod (38) and stirring blades (25), the motor (22) is arranged outside the water washing dust collector (1), an output end of the motor (22) is fixedly connected with a rotating rod (23) through a shaft coupling, the rotating rod (23) extends to the inner cavity of the water washing dust collector (1), one end of the rotating rod (23) extending to the inner cavity of the water washing dust collector (1) is fixedly connected with a second bevel gear (24), a bottom end of the rotating rod (38) is fixedly connected with a first bevel gear (21), the rotating rod (38) and the water washing dust collector (1) are drivingly connected through the first bevel gear (21) and the second bevel gear (24), the rotating rod (38) is provided with the stirring blades (25) for fully mixing the working liquid and the cleaning water.

5. The water washing dust removal system for protecting the activity of a catalyst for hydrogen peroxide production according to claim 4, characterized by: The rotating rod (38) is provided with a circular plate (26), the circular plate (26) is provided with a movable groove (27), the movable groove (27) is provided with an extension rod (29), the extension rod (29) and the movable groove (27) are connected with a spring (28), and the extension rod (29) is provided with a pushing plate (30) at an end portion.

6. The water washing dust removal system for protecting the activity of a catalyst for hydrogen peroxide production according to claim 5, characterized by: The water control valve (8) is provided with a pushing rod (9), the rotating angle of the pushing rod (9) controls the opening and closing size of the water control valve (8), when the rotating rod (38) rotates at a low speed, the pushing plate (30) does not contact the pushing rod (9), and the cleaning water flow is small, when the rotating rod (38) rotates at a high speed, the pushing plate (30) contacts the pushing rod (9) under the action of centrifugal force, and the cleaning water flow becomes large.

7. The water washing dust removal system for protecting the activity of a catalyst for hydrogen peroxide production according to claim 1, characterized by: The inner wall of the water washing dust collector (1) is provided with a plurality of limiting rods, including a first limiting rod (17), a second limiting rod (18), a third limiting rod (19) and a fourth limiting rod (20), and the end portions of the limiting rods all point to the central axis of the water washing dust collector (1).

8. The water washing dust removal system for protecting the activity of a catalyst for hydrogen peroxide production according to claim 1, characterized by: The upper portion of the inner portion of the water washing dust collector (1) is provided with a supporting grid plate (36), the supporting grid plate (36) is provided with oil-water separation filler (35), the oil-water separation filler (35) is arranged above the supporting grid plate (36), a pressing plate (33) is arranged above the oil-water separation filler (35), the pressing plate (33) is connected to the inner wall of the water washing dust collector (1) through a screw, so as to prevent the filler from being scattered when the working liquid floats, and an anti-rotation cross plate (31) is arranged in the inner cavity of the water washing dust collector (1) and above the cleaning water outlet (3).

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