A malodorous gas treatment device based on a sludge drying system

Abstract

This invention relates to the field of gas treatment equipment technology and discloses an odor gas treatment device based on a sludge drying system. The device includes a purification tower with an exhaust port at the top, symmetrically installed viewing windows on the middle of the outer wall of the purification tower, several circumferentially evenly distributed maintenance ports on the lower side of the outer wall, symmetrically installed airflow distribution plates on the middle of the inner wall of the purification tower, and symmetrically connected treatment liquid delivery pipes on the lower side of the outer wall. This odor gas treatment device based on a sludge drying system effectively solves the problems in existing technologies where nano-microbubble waste gas treatment equipment generally adopts a micropore or narrow-slit jet structure, which easily causes blockage within the micropores / slits; the lack of a uniform microbubble distribution design leads to microbubbles concentrating in the center or locally on the wall of the tower, forming "bubble columns," and the microbubbles rapidly coalescing into millimeter-sized large bubbles during their ascent, directly reducing both the effective gas-liquid contact area and the effective gas-liquid contact time.

Description

Technical Field

[0001] This invention relates to the field of gas treatment equipment technology, and specifically to an odor gas treatment device based on a sludge drying system. Background Technology

[0002] Existing sludge drying systems can significantly reduce the moisture content of sludge, providing a foundation for subsequent disposal pathways such as incineration, building material utilization, and land improvement. However, during operation, these systems continuously generate large volumes of odorous gases with high humidity, high dust content, complex composition, and drastic concentration fluctuations. These gases must undergo comprehensive purification and meet emission standards before being released, making it a core environmental protection aspect that must be controlled throughout the entire sludge drying process. To address the shortcomings of traditional treatment technologies, microbubble gas-liquid mass transfer technology is gradually being introduced into the field of industrial odor control. Leveraging the advantages of large specific surface area, high mass transfer efficiency, and in-situ oxidation of pollutants by micron-sized bubbles, it has the theoretical potential to significantly improve odor purification efficiency.

[0003] In response, this application designs an odor gas treatment device based on a sludge drying system. Existing nano-microbubble exhaust gas treatment devices, when treating dusty and humid odorous gases generated during sludge drying, have not been specifically developed for the unique operating conditions of sludge drying tail gas. Firstly, they generally adopt micropore and narrow-slit jet structures, which cause blockages in the micropores / narrow slits due to inorganic dust, sticky organic aerosols, and salt crystals precipitated during the circulation of the treatment liquid in the sludge drying tail gas. Secondly, the lack of uniform microbubble distribution design leads to the formation of "bubble columns" in the center or on the wall of the tower. As the microbubbles rise, they rapidly coalesce into millimeter-sized large bubbles, directly reducing the effective gas-liquid contact area and effective gas-liquid contact time. This affects the mass transfer advantage of the microbubbles, and the organic odor components do not have enough time to degrade, directly overflowing from the liquid surface with the large bubbles, causing odor escape, exceeding emission standards, and posing a high risk to environmental compliance. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides an odor gas treatment device based on a sludge drying system. This device effectively solves the problems of existing nano-microbubble waste gas treatment devices, which generally employ micropore and narrow-slit jet structures, easily causing blockages within the micropores / slits; and the lack of uniform microbubble distribution design, leading to the formation of "bubble columns" at the center or localized on the walls of the tower. Furthermore, the rapid coalescence of microbubbles into millimeter-sized large bubbles during their ascent directly reduces both the effective gas-liquid contact area and the effective gas-liquid contact time.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides an odor gas treatment device based on a sludge drying system, comprising: The purification tower has an exhaust port at the top. The outer wall of the purification tower has windows symmetrically installed at the top and bottom. Several inspection ports are evenly distributed in a circle on the lower side of the outer wall of the purification tower. The inner wall of the purification tower has airflow distribution plates symmetrically installed at the top and bottom. The lower side of the outer wall of the purification tower is symmetrically connected to the treatment liquid delivery pipe. A microbubble treatment section is set on the lower side of the inner wall of the purification tower. The inspection ports and the microbubble treatment section are both equipped with anti-clogging parts. The microbubble treatment section includes a sealing plate that can be detached and installed on the inner wall of the purification tower with several corresponding inspection ports. The purification tower is equipped with a micro-nano bubble generator, which consists of a Venturi jet section and an annular swirl shear section. The rear end of the Venturi jet section is installed through the corresponding sealing plate. The front end of the micro-nano bubble generator is equipped with a microbubble nozzle, which is fixedly connected to the corresponding sealing plate. The purification tower and the microbubble nozzle are both equipped with a microbubble distribution group. The anti-blocking section includes swirling guide vanes mounted on the inner wall of the left inspection port via a support frame, and a dredging assembly is provided on both the inspection port and the microbubble treatment section.

[0006] Furthermore, a connecting plate is integrally installed at the rear end of the microbubble nozzle, and an installation column is fixedly sleeved on the outer wall of the connecting plate. Both ends of the installation column are rounded. A swirl-starting blade is fixedly sleeved on the front side of the outer wall of the installation column, and a spiral cutting blade is fixedly sleeved on the outer wall of the installation column behind the swirl-starting blade. The spiral cutting blade is composed of several evenly distributed spiral cutting fins, and the outer walls of both the swirl-starting blade and the spiral cutting blade are movably attached to the inner wall of the annular swirling shear section.

[0007] Furthermore, the microbubble distribution group includes a spiral guide plate installed on the lower side of the inner wall of the purification tower. The spiral guide plate is composed of several segmented guide plates that are evenly distributed in a spiral. The rear end of the microbubble nozzle has symmetrically opened flow-dividing chambers on the left and right sides. The length of the left flow-dividing chamber is greater than the length of the right flow-dividing chamber. The front and rear sides of the outer wall of the microbubble nozzle are respectively connected to multi-hole nozzles. The multi-hole nozzles on the front and rear sides are staggered and connected to the corresponding flow-dividing chambers.

[0008] Furthermore, a water line connection flange is bolted to the rear access port, a gas line connection flange is bolted to the left access port, and a cover plate is bolted to the front access port.

[0009] Furthermore, a trachea is installed through the middle of the left sealing plate, and the end of the trachea away from the sealing plate is connected to the outer wall of the throat of the Venturi jet section.

[0010] Furthermore, the unblocking assembly includes a receiving groove located at the rear end of the microbubble nozzle. An unblocking slide rod is slidably installed on the inner wall of the receiving groove via a return spring. The rear end of the unblocking slide rod is rounded. The microbubble nozzle and the connecting plate are both provided with mounting slide holes, which are designed in a stepped shape.

[0011] Furthermore, the unblocking assembly also includes a stepped shaft that is slidably installed on the inner wall of the larger diameter end of the mounting slide hole via a return spring. The smaller diameter section of the stepped shaft is also slidably connected to the inner wall of the mounting slide hole and movably fits against the front end face of the mounting column. The front end of the stepped shaft slides through the corresponding sealing plate. The unblocking assembly also includes an electric push rod that is installed through the cover plate. The electric push rod is used to drive the stepped shaft to slide back and forth.

[0012] Furthermore, the anti-blocking unit also includes a connecting pipe that is symmetrically connected to the upper and lower parts of the outer wall of the left inspection port, and a spray head connected to the upper connecting pipe is installed on the upper side of the inner wall of the left inspection port.

[0013] Furthermore, a wire mesh demister and a perforated plate corrugated packing are installed on the inner wall of the purification tower between the upper and lower airflow distribution plates, respectively. The wire mesh demister is located below the perforated plate corrugated packing, and the upper part of the upper airflow distribution plate is filled with polyhedral hollow spheres.

[0014] Furthermore, a spray bracket is installed on the upper side of the inner wall of the purification tower, and the water inlet end of the spray bracket is installed through the outer wall of the purification tower. A demister is installed at the upper end of the purification tower corresponding to the exhaust port.

[0015] The technical solution provided by this invention has the following advantages compared with the prior art: This invention provides an odor gas treatment device based on a sludge drying system. In the core degradation stage of the storage chamber, after the micro-nano bubble group enters the microbubble nozzle, it will enter the symmetrically opened diversion chambers on the left and right sides. Subsequently, the micro-nano bubble group will be radially sprayed into the storage chamber at the bottom of the purification tower through the multi-hole nozzles connected to the corresponding diversion chambers. At this time, under the spiral guidance of the spiral guide plate, the radially dispersed micro-nano bubble group can be regulated into a spiral upward flow along the circumference of the inner wall of the purification tower. This forces the micro-nano bubble group to flow upward along the preset spiral flow channel, avoiding the accumulation of micro-nano bubble group towards the center of the tower or the wall. The spiral flow can significantly extend the travel path of the micro-nano bubble group in the treatment liquid, thereby achieving full coverage and no blind spots in the radial and circumferential distribution of the micro-nano bubble group in the purification tower, completely avoiding the problem of local concentration and the formation of "bubble columns" in the initial spraying stage of microbubbles.

[0016] During the online anti-clogging and maintenance phase of the micro-nano bubble generator, the electric push rod can be driven to slide back and forth during the operation of the purification tower. When the telescopic end of the electric push rod moves forward, it pushes the stepped shaft to slide forward along the mounting hole, and pushes the unblocking slide rod to slide forward along the receiving groove, extending into the throat of the Venturi jet section. This scrapes and unblocks the salt crystals and sticky impurities attached to the inner wall of the throat. When the telescopic end of the electric push rod retracts backward, the stepped shaft and the unblocking slide rod are simultaneously reset under the action of the electric push rod's retraction and the return spring. By automatically unblocking the throat of the Venturi jet section on the micro-nano bubble generator online, the core part of the micro-nano bubble generator that is most prone to clogging can be intermittently cleaned without stopping the machine or disassembling the equipment. This completely solves the problem of gradual blockage of the jet path and continuous decline in treatment efficiency during the operation of traditional nano-microbubble exhaust gas treatment equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of a partial three-dimensional cross-section in an embodiment of the present invention; Figure 3 For the present invention Figure 2 A magnified structural diagram of section X in the middle; Figure 4 This is a three-dimensional structural diagram of the purification tower, airflow distribution plate, and spray support in an embodiment of the present invention; Figure 5 This is a schematic diagram of a partial three-dimensional cross-section of the purification tower and the microbubble treatment unit in an embodiment of the present invention; Figure 6 This is a schematic diagram of the three-dimensional separation of the microbubble treatment section and the anti-clogging section in an embodiment of the present invention; Figure 7 This is a schematic diagram of the three-dimensional separation of the microbubble nozzle and the stepped shaft in an embodiment of the present invention; Figure 8 This is a schematic diagram of a three-dimensional partial cross-section of the micro / nano bubble generator and microbubble nozzle in an embodiment of the present invention; Figure 9 This is a schematic diagram of a partial three-dimensional cross-section of the mounting column, the spinning blade, and the spiral cutting blade in an embodiment of the present invention; Figure 10This is a three-dimensional structural diagram of the demister in an embodiment of the present invention.

[0019] The labels in the diagram represent: 1. Purification tower; 11. Wire mesh demister; 12. Orifice plate corrugated packing; 13. Polyhedral hollow sphere; 14. Sprayer support; 15. Demister; 2. Viewing window; 3. Inspection port; 31. Water connection flange; 32. Gas connection flange; 33. Cover plate; 4. Airflow distribution plate; 5. Processing liquid delivery pipe; 6. Microbubble treatment section; 61. Sealing plate; 611. Gas pipe; 62. Micro / nano bubble generator; 621. Safety... 622. Column mounting; 623. Rotating blade; 63. Spiral cutting blade; 64. Microbubble nozzle; 65. Connecting plate; 66. Microbubble distribution group; 67. Spiral guide plate; 68. Diverting chamber; 69. Multi-hole nozzle; 70. Anti-clogging part; 71. Swirl guide blade; 72. Connecting pipe; 73. Spray head; 74. Unblocking group; 75. Receiving chute; 76. Unblocking slide rod; 77. Installation slide hole; 78. Stepped shaft; 79. Electric push rod. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0021] The present invention will be further described below with reference to embodiments.

[0022] Example: Please see Figures 1-10 This invention provides a technical solution: an odor gas treatment device based on a sludge drying system, comprising: The purification tower 1 has an exhaust port at the top. The outer wall of the purification tower 1 has windows 2 symmetrically installed at the top and bottom. The lower side of the outer wall of the purification tower 1 has several inspection ports 3 evenly distributed in a circle. The inner wall of the purification tower 1 has airflow distribution plates 4 symmetrically installed at the top and bottom. The lower side of the outer wall of the purification tower 1 is symmetrically connected to the treatment liquid delivery pipes 5. The lower side of the inner wall of the purification tower 1 is provided with a microbubble treatment section 6. The inspection ports 3 and the microbubble treatment section 6 are both provided with anti-clogging sections 7. The microbubble treatment unit 6 includes a sealing plate 61 located on the inner wall of the purification tower 1, which can be detached and installed with several inspection ports 3. The purification tower 1 is equipped with a micro-nano bubble generator 62, which is composed of a Venturi jet section and an annular swirl shear section. The rear end of the Venturi jet section is installed through the corresponding sealing plate 61. The front end of the micro-nano bubble generator 62 is equipped with a microbubble nozzle 63, and the front end of the microbubble nozzle 63 is fixedly connected to the corresponding sealing plate 61. The purification tower 1 and the microbubble nozzle 63 are jointly equipped with a microbubble distribution group 64. The anti-blocking section 7 includes a swirl guide vane 71 mounted on the inner wall of the left inspection port 3 via a support frame, and a dredging assembly 74 is provided on both the inspection port 3 and the microbubble treatment section 6.

[0023] The microbubble nozzle 63 has an integrated connecting plate 631 installed at its rear end. An installation post 621 is fixedly sleeved on the outer wall of the connecting plate 631. Both ends of the installation post 621 are rounded. A swirl-starting blade 622 is fixedly sleeved on the front side of the outer wall of the installation post 621. A spiral cutting blade 623 is fixedly sleeved on the outer wall of the installation post 621 behind the swirl-starting blade 622. The spiral cutting blade 623 is composed of several spirally and evenly distributed cutting fins. The outer walls of the swirl-starting blade 622 and the spiral cutting blade 623 are movably attached to the inner wall of the annular swirling shear section.

[0024] The microbubble distribution group 64 includes a spiral guide plate 641 installed on the lower side of the inner wall of the purification tower 1. The spiral guide plate 641 is composed of several segmented guide plates that are evenly distributed in a spiral. The rear end of the microbubble nozzle 63 is symmetrically provided with flow-dividing chambers 642. The length of the left flow-dividing chamber 642 is greater than the length of the right flow-dividing chamber 642. The front and rear sides of the outer wall of the microbubble nozzle 63 are respectively connected to multi-hole nozzles 643. The multi-hole nozzles 643 on the front and rear sides are staggered and connected to the corresponding flow-dividing chambers 642.

[0025] A water connection flange 31 for conveying treatment liquid is bolted to the rear access port 3, a gas connection flange 32 for conveying waste gas is bolted to the left access port 3, and a cover plate 33 is bolted to the front access port 3.

[0026] A trachea 611 is installed through the middle of the left sealing plate 61, and the end of the trachea 611 away from the sealing plate 61 is connected to the outer wall of the throat of the Venturi jet section.

[0027] The unblocking assembly 74 includes a receiving groove 741 located at the rear end of the microbubble nozzle 63. A unblocking slide rod 742 is slidably installed on the inner wall of the receiving groove 741 by means of a return spring. The rear end of the unblocking slide rod 742 is rounded. The microbubble nozzle 63 and the connecting plate 631 are both provided with mounting holes 743, which are stepped in shape.

[0028] The unblocking assembly 74 also includes a stepped shaft 744 that is slidably installed on the inner wall of the larger diameter end of the mounting slide hole 743 by a return spring. The smaller diameter section of the stepped shaft 744 is also slidably connected to the inner wall of the mounting slide hole 743 and movably fits against the front end face of the mounting column 621. The front end of the stepped shaft 744 slides through the corresponding sealing plate 61. The unblocking assembly 74 also includes an electric push rod 745 that is installed through the cover plate 33. The electric push rod 745 is used to drive the stepped shaft 744 to slide back and forth.

[0029] The anti-blocking part 7 also includes a connecting pipe 72 that is symmetrically connected to the upper and lower parts of the outer wall of the left inspection port 3, and a spray head 73 connected to the upper connecting pipe 72 is installed on the upper side of the inner wall of the left inspection port 3.

[0030] On the inner wall of the purification tower 1, between the upper and lower airflow distribution plates 4, a wire mesh demister 11 and a perforated plate corrugated packing 12 are respectively installed. The wire mesh demister 11 is located below the perforated plate corrugated packing 12, and the upper end of the upper airflow distribution plate 4 is filled with polyhedral hollow spheres 13.

[0031] A spray support 14 is installed on the upper side of the inner wall of the purification tower 1. The spray support 14 consists of a spray pipe and a support plate. The water inlet end of the spray support 14 is installed through the outer wall of the purification tower 1. A demister 15 is installed at the upper end of the purification tower 1 corresponding to the exhaust port. The demister 15 consists of a ridge-type demister and a reverse cleaning pipe.

[0032] In practice: First, the microbubble treatment unit 6 in this application is used to treat odorous waste gas by micro-nano bubble formation, achieving super-full gas-liquid contact and preliminary degradation of odorous components; the anti-clogging unit 7 is used to unclog and prevent clogging of the throat of the Venturi jet section on the micro-nano bubble generator 62, adapting to the high dust and high viscosity conditions of sludge drying tail gas. It should be noted that the lower inner wall area of ​​the purification tower 1, that is, the closed cavity between the lower airflow distribution plate 4 and the bottom end cap, is the treatment liquid storage cavity, used to store and carry the treatment liquid of the core reaction of odor degradation; the treatment liquid delivery pipes 5 on the lower outer wall of the purification tower 1 are symmetrically connected, with the lower treatment liquid delivery pipe 5 being the circulating outlet pipe and the upper treatment liquid delivery pipe 5 being the circulating return pipe. The treatment liquid delivery pipe 5 is connected to the inlet and outlet pipes of the external circulating storage tank to achieve the effect of circulating the treatment liquid. The upper connecting pipe 72 is connected to the external high-pressure cleaning pipe, which can intermittently perform multi-directional high-pressure spraying and rinsing on the swirl guide vane 71 and the inner wall of the corresponding inspection port 3 through the spray head 73. In addition, the water connection flange 31 is connected to the inlet of the Venturi jet section on the micro-nano bubble generator 62. The water connection flange 31 can deliver high-pressure treatment liquid into the micro-nano bubble generator 62 through the variable frequency circulating pump of the external treatment liquid circulation unit. The gas connection flange 32 is connected to the odor exhaust gas outlet pipe of the sludge drying system to transport the odor exhaust gas discharged from the sludge drying system.

[0033] During the preparation phase, a treatment liquid suitable for the odor characteristics of sludge drying needs to be injected into the storage chamber of purification tower 1. The treatment liquid can be the condensate or purified water produced by the sludge dryer. If the condensate alone has limited capacity to treat recalcitrant organic odors, a small amount of functional agents can be added to form a special absorbent liquid. The liquid level is monitored in real time through window 2, and a liquid level sensor is used to achieve closed-loop control. At the same time, an equal amount of treatment liquid produced by the sludge drying system itself is added to maintain a stable liquid level in the storage chamber, ensuring the microbubble nozzle 63 and micro-nano gas... The bubble generator 62 is completely submerged in the treatment liquid. Then, the treatment liquid in the storage chamber is continuously drawn out by the treatment liquid delivery pipe 5 on the lower side through the external circulation pump and sent to the external circulation storage tank. After buffering and stabilizing, the treatment liquid can pass through the external precision filter to remove inorganic dust, sticky organic flocs, and salt crystal particles. The filtered clean treatment liquid is then pressurized by the circulation pump and stored in the external circulation storage tank. The treatment liquid is then sent back to the storage chamber by the treatment liquid delivery pipe 5 on the upper side to maintain a stable liquid level.

[0034] In the pretreatment stage of odorous waste gas, the corresponding valve is first opened, and the waste gas is transported to the inspection port 3 on the left through the gas connection flange 32. It should be noted that at this time, the gas connection flange 32 and the gas pipe 611 are both connected to the inspection port 3 on the left, and the gas path is connected. During the process of the waste gas entering the inspection port 3 and the gas pipe 611, the waste gas will flow at high speed through the swirl guide vanes 71. Under the guidance of the vanes, a high-speed swirling flow is formed. Centrifugal force is used to throw the large-diameter inorganic dust and sticky organic aerosols carried in the waste gas onto the inner wall of the corresponding inspection port 3, thereby achieving preliminary gas-solid and gas-liquid separation. The pretreated waste gas can continue to be discharged. The air pipe 611 delivers air to the venturi throat of the micro-nano bubble generator 62 in a directional and sealed manner, with no short circuits or escapes throughout the process. Through cyclone centrifugal pretreatment, the core impurities (part of the dust and viscous aerosols in the exhaust gas) that are prone to clogging and microbubble aggregation are removed in advance. This significantly reduces the probability of clogging in the micro-nano bubble generator 62 from the air intake source, while avoiding the phenomenon of microbubble aggregation and local concentration due to viscous substances. This stabilizes the quality of the exhaust gas entering the micro-nano bubble generator 62, solving the industry pain points of micropore clogging and bubble aggregation in existing equipment from the air intake source. This lays the foundation for the subsequent uniform generation of microbubbles and efficient gas-liquid countercurrent mass transfer.

[0035] It is worth emphasizing that after the swirl guide vane 71 has been working for a long time, impurities will inevitably adhere to its surface. It is necessary to periodically send high-pressure cleaning fluid through the external water pump into the spray head 73 through the upper connecting pipe 72 to form a continuous spray water curtain. The high-pressure water curtain sprayed from the spray head 73 continuously washes the swirl guide vane 71, the inner wall of the inspection port 3, and the air inlet of the air pipe 611 online, washing the attached dust and sticky organic impurities onto the bottom inner wall of the inspection port 3. Then, open the corresponding valve of the lower connecting pipe 72 and stop the delivery of exhaust gas. The exhaust gas is then discharged through the lower connecting pipe 72 for centralized treatment and the corresponding valve is closed. Through online spray rinsing, the pre-treatment components are self-cleaned, and maintenance can be completed without stopping the machine. This ensures that the air intake channel remains unobstructed. The pre-treated clean exhaust gas is directionally delivered to the generator through the sealed air pipe 611 to prevent short-circuit escape of exhaust gas and completely avoid impurities from entering the generator and causing flow channel blockage.

[0036] It should be noted that, under the fixing action of the microbubble nozzle 63 and the connecting plate 631, the positions of the mounting column 621, the swirl blade 622 and the spiral cutting blade 623 can remain fixed. Furthermore, the flow channels of the Venturi jet section and the annular swirling shear section have a smooth transition and no local low-speed zones. The high-speed liquid flow forms a self-flushing effect on the inner wall of the flow channel throughout the entire process, which can avoid the adhesion and accumulation of most viscous impurities and salt crystals.

[0037] In the swirling shear cavitation and uniform microbubble formation stage, the gas-liquid mixture that has completed the initial mixing and shearing will continue to enter the annular swirling shearing section at high speed from the Venturi jet section. Specifically, the gas-liquid mixture first flows through the swirl blade 622, forming a high-speed swirling flow under the guidance of the blade. The swirling gas-liquid mixture continues to flow backward and enters the shearing channel formed by the spiral cutting blade 623 and the inner wall of the annular swirling shearing section. The shearing channel can perform secondary cavitation and high-frequency multi-stage mechanical shearing on the gas-liquid mixture, breaking the bubbles in the mixture step by step, and finally stably generating a uniform microbubble cluster. The micro-nano bubbles carrying odorous pollutants will continue to enter the microbubble nozzle 63 with the treated liquid flow. Through the two-stage shear cavitation bubble formation system, a micro-nano bubble cluster with uniform particle size is stably generated. Compared with ordinary single-stage bubble formation equipment, the specific surface area is greatly improved, the interfacial adsorption capacity is stronger, and the cavitation effect can generate hydroxyl radicals to enhance oxidation, providing a highly active reaction medium with a high specific surface area for subsequent gas-liquid core degradation.

[0038] In the core degradation stage of the storage chamber, after the micro-nano bubble clusters enter the microbubble nozzle 63, they will enter the symmetrically opened diversion chambers 642 on the left and right sides. The left diversion chamber 642 is longer than the right diversion chamber 642, which can achieve differentiated stroke distribution of the micro-nano bubble clusters. At this time, the flow rate and pressure of the micro-nano bubble clusters entering the left and right diversion chambers 642 are uniform. Subsequently, the micro-nano bubble clusters will be radially sprayed into the storage chamber at the bottom of the purification tower 1 through the multi-hole nozzles 643 connected to the corresponding diversion chambers 642. At this time, after being evenly sprayed by the two multi-hole nozzles 643, the micro-nano bubble clusters will flow upward in the storage chamber under the action of buoyancy. During this process, the micro-nano bubble clusters will interact with the spiral guide on the lower side of the inner wall of the purification tower 1. When the flow plate 641 comes into contact with the micro-nano bubble generator 62 and the microbubble nozzle 63, the spiral guide plate 641 is composed of several segmented guide plates that are evenly distributed in a spiral. At this time, under the spiral guidance of the spiral guide plate 641, the radially dispersed micro-nano bubble group can be regularized into a spiral upward flow state along the circumferential direction of the inner wall of the purification tower 1. This forces the micro-nano bubble group to flow upward along the preset spiral flow channel, avoiding the accumulation of the micro-nano bubble group towards the center of the tower or the wall. The spiral flow state can greatly extend the travel path of the micro-nano bubble group in the treatment liquid, thereby achieving full coverage and no blind spot distribution of the micro-nano bubble group in the radial and circumferential directions of the purification tower 1, and completely avoiding the problem of local concentration and formation of "bubble columns" in the initial spraying stage of microbubbles.

[0039] In addition, as the upper treatment liquid delivery pipe 5 continuously delivers fresh treatment liquid to the upper part of the storage chamber and the top area of ​​the spiral guide plate 641, the fresh treatment liquid will flow downward along the central area of ​​the tower under the action of gravity, forming a full-process counter-current flow with the microbubble flow spiraling upward along the tower wall, constructing a closed counter-current flow field of "circumferential spiral upward - central axial downward", realizing full-process counter-current contact between the gas and liquid phases. During the counter-current contact process, the micro-nano bubble group will continuously rotate and collide in the spiral flow field, which not only avoids the bubble coalescing and growing, but also realizes the continuous high-speed renewal of the gas-liquid interface. The odorous pollutants such as hydrogen sulfide, ammonia, thioether, and mercaptans in the bubble core will continuously diffuse into the treatment liquid in the bubble shell through the gas-liquid interface, and fully contact the deodorizing components in the fresh treatment liquid coming from the counter-current flow and the hydroxyl radicals generated by microbubble cavitation, and simultaneously undergo oxidation, neutralization, and degradation reactions, ensuring that the difficult-to-degrade organic odorous components have sufficient reaction time, and achieving deep removal of odorous pollutants.

[0040] After passing through spiral flow and counter-current mass transfer, the micro-nano bubble cluster continues to flow upward along the spiral flow channel, forming a strong air lift effect: on the one hand, during the upward process, the micro-nano bubbles continuously enrich the degraded pollutants and unreacted odor components in the liquid phase to the gas-liquid interface, and continuously react with the active components in the treatment liquid to achieve the bottom-up degradation of residual odor components; on the other hand, the microbubbles rise to the surface of the treatment liquid and burst, releasing the clean gas after core degradation, completing the gas-liquid separation, and the gas flows upward to the airflow distribution plate 4 below.

[0041] In the secondary deep purification and fine treatment stage, the clean gas overflowing from the surface of the treated liquid first flows through the lower airflow distribution plate 4. This uniform flow ensures the gas is evenly distributed across the cross-section of the purification tower 1, preventing flow deviation and channeling. The evenly distributed gas then continues to flow upwards. Specifically, it first passes through a wire mesh demister 11, which intercepts large-diameter treated liquid droplets and residual dust particles carried in the gas, preventing impurities from entering the upper packing layer and causing blockage. Subsequently, the gas continues to flow upwards into the perforated plate corrugated packing 12, where a uniform liquid film forms on the packing surface. This film fully contacts the treated liquid film on the packing surface, performing secondary deep adsorption and reduction of residual trace odor components in the gas. This system ensures effective odor control and prevents odor escape. After purification by the packing layer, the gas continues to flow upwards and is uniformly distributed by the upper airflow distribution plate 4 before entering the polyhedral hollow sphere 13 packing layer. Simultaneously, externally circulating clean treatment liquid is sent into the spray pipe of the spray support 14 and sprayed downwards to form dispersed droplets. When the spray liquid falls onto the polyhedral hollow sphere 13 packing layer, it causes the polyhedral hollow sphere 13 to form disordered turbulence, making the spray liquid form a highly dispersed liquid film and droplets in the packing layer. This creates a sufficient countercurrent contact with the upward-flowing gas, thereby achieving the final spraying and cleaning of the gas to remove residual trace odor components and ultrafine dust.

[0042] During the demisting and emission compliance stage, the gas, after being sprayed and finely washed, continues to flow upward and enters the demister 15 at the exhaust port at the top of the purification tower 1. The ridge-type demister of the demister 15 efficiently intercepts and separates the fine liquid droplets carried in the gas, avoiding liquid in the exhaust gas from causing subsequent pipeline corrosion and white smoke emission problems. At the same time, the reverse cleaning pipe equipped with the demister 15 can periodically flush the demister online to avoid scaling and blockage. The clean exhaust gas after demisting and separation is stably discharged into the atmosphere through the exhaust port at the top of the purification tower 1, meeting emission standards.

[0043] During the online anti-clogging and maintenance phase of the micro-nano bubble generator 62, the anti-clogging and unblocking steps can be initiated periodically during the operation of the purification tower 1, driving the electric push rod 745 to slide back and forth: when the telescopic end of the electric push rod 745 moves forward, it pushes the stepped shaft 744 to slide forward along the mounting slide hole 743, pushing the unblocking slide rod 742 to slide forward along the receiving slide groove 741, extending into the throat of the Venturi jet section, scraping and unblocking the salt crystals and sticky impurities attached to the inner wall of the throat. When the telescopic end of the electric push rod 745 retracts backward, the stepped shaft 744... The ladder shaft 744 and the unblocking slide bar 742 are synchronously reset under the action of the electric push rod 745 and the return spring, completing one unblocking cycle. During the unblocking process, the purification of exhaust gas can be carried out normally. By automatically unblocking the throat of the Venturi jet section on the micro-nano bubble generator 62 online, the core part of the micro-nano bubble generator 62 that is most prone to blockage can be intermittently cleaned without stopping the machine or disassembling the equipment. This completely solves the problem of gradual blockage of the jet path and continuous decline in treatment efficiency during the operation of traditional nano-microbubble exhaust gas treatment equipment.

[0044] After the equipment has been running for a set period, a periodic online flushing step can be initiated. High-pressure cleaning fluid is used to perform a full-process high-flow self-flushing of the pretreatment components, Venturi channels, microbubble nozzles 63, porous nozzles 643, and spiral guide plates 641, thoroughly cleaning away any attached impurities and scale. During daily operation, staff can monitor the liquid level, bubble generation status, spiral flow field stability, and component operation in real time through window 2, completing daily inspections without opening the cover. When the equipment requires in-depth maintenance, after shutdown, the core components (micro-nano bubble generator 62, mounting column 621, and microbubble nozzle 63) can be quickly disassembled, inspected, and replaced through the maintenance port 3.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An odor gas treatment device based on a sludge drying system, characterized in that, include: A purification tower (1) with an exhaust port at the top, with viewing windows (2) symmetrically installed in the middle of the outer wall of the purification tower (1), and several inspection ports (3) evenly distributed in a circle installed on the lower side of the outer wall of the purification tower (1), with airflow distribution plates (4) symmetrically installed in the middle of the inner wall of the purification tower (1), with treatment liquid delivery pipes (5) symmetrically connected in the lower side of the outer wall of the purification tower (1), and a microbubble treatment section (6) provided in the lower inner side of the purification tower (1), with anti-clogging section (7) provided on both the inspection port (3) and the microbubble treatment section (6). The microbubble treatment unit (6) includes a sealing plate (61) located on the inner wall of the purification tower (1) that can be detachably installed for several inspection ports (3). A micro-nano bubble generator (62) is installed inside the purification tower (1). The micro-nano bubble generator (62) is composed of a Venturi jet section and an annular swirl shear section. The rear end of the Venturi jet section is installed through the corresponding sealing plate (61). A microbubble nozzle (63) is installed at the front end of the microbubble generator (62). The front end of the microbubble nozzle (63) is fixedly connected to the corresponding sealing plate (61). A microbubble distribution group (64) is provided on both the purification tower (1) and the microbubble nozzle (63). The anti-blocking part (7) includes a swirl guide vane (71) installed on the inner wall of the left inspection port (3) by a support frame, and a dredging assembly (74) is provided on both the inspection port (3) and the microbubble treatment part (6).

2. The odor gas treatment equipment based on a sludge drying system according to claim 1, characterized in that: The microbubble nozzle (63) is integrated with a connecting plate (631) at its rear end. A mounting post (621) is fixedly sleeved on the outer wall of the connecting plate (631). Both ends of the mounting post (621) are rounded. A swirl blade (622) is fixedly sleeved on the front side of the outer wall of the mounting post (621). A spiral cutting blade (623) is fixedly sleeved on the outer wall of the mounting post (621) behind the swirl blade (622). The spiral cutting blade (623) is composed of several spirally evenly distributed cutting fins. The outer walls of the swirl blade (622) and the spiral cutting blade (623) are movably attached to the inner wall of the annular swirling shear section.

3. The odor gas treatment equipment based on a sludge drying system according to claim 1, characterized in that: The microbubble distribution group (64) includes a spiral guide plate (641) installed on the lower side of the inner wall of the purification tower (1). The spiral guide plate (641) is composed of several segmented guide plates that are evenly distributed in a spiral. The microbubble nozzle (63) has symmetrically opened diversion chambers (642) on the left and right sides at the rear end. The length of the left diversion chamber (642) is greater than the length of the right diversion chamber (642). The front and rear sides of the outer wall of the microbubble nozzle (63) are respectively connected to multi-hole nozzles (643). The multi-hole nozzles (643) on the front and rear sides are staggered and connected to the corresponding diversion chambers (642).

4. The odor gas treatment equipment based on a sludge drying system according to claim 1, characterized in that: A water connection flange (31) is bolted to the rear inspection port (3), an air connection flange (32) is bolted to the left inspection port (3), and a cover plate (33) is bolted to the front inspection port (3).

5. The odor gas treatment equipment based on a sludge drying system according to claim 1, characterized in that: A trachea (611) is installed through the middle of the sealing plate (61) on the left side. The end of the trachea (611) away from the sealing plate (61) is connected to the outer wall of the throat of the Venturi jet section.

6. The odor gas treatment equipment based on a sludge drying system according to claim 1, characterized in that: The unblocking assembly (74) includes a receiving groove (741) located at the rear end of the microbubble nozzle (63). A unblocking slide rod (742) is slidably installed on the inner wall of the receiving groove (741) by a return spring. The rear end of the unblocking slide rod (742) is rounded. The microbubble nozzle (63) and the connecting plate (631) are jointly provided with mounting slide holes (743). The mounting slide holes (743) are stepped.

7. An odor gas treatment device based on a sludge drying system according to claim 6, characterized in that: The unblocking assembly (74) also includes a stepped shaft (744) that is slidably installed on the inner wall of the larger diameter end of the mounting slide hole (743) by a return spring. The smaller diameter section of the stepped shaft (744) is also slidably connected to the inner wall of the mounting slide hole (743) and movably attached to the front end face of the mounting column (621). The front end of the stepped shaft (744) slides through the corresponding sealing plate (61). The unblocking assembly (74) also includes an electric push rod (745) that is installed through the cover plate (33). The electric push rod (745) is used to drive the stepped shaft (744) to slide back and forth.

8. An odor gas treatment device based on a sludge drying system according to claim 4, characterized in that: The anti-blocking part (7) also includes a connecting pipe (72) that is symmetrically connected to the upper and lower sides of the outer wall of the left inspection port (3), and a spray head (73) connected to the upper connecting pipe (72) is installed on the upper side of the inner wall of the left inspection port (3).

9. An odor gas treatment device based on a sludge drying system according to claim 1, characterized in that: The purification tower (1) is equipped with a wire mesh demister (11) and a perforated plate corrugated packing (12) between the upper and lower airflow distribution plates (4) on the inner wall. The wire mesh demister (11) is located below the perforated plate corrugated packing (12), and the upper end of the upper airflow distribution plate (4) is filled with a polyhedral hollow sphere (13).

10. An odor gas treatment device based on a sludge drying system according to claim 9, characterized in that: A spray bracket (14) is installed on the upper side of the inner wall of the purification tower (1). The water inlet end of the spray bracket (14) is installed through the outer wall of the purification tower (1). A demister (15) is installed at the upper end of the purification tower (1) corresponding to the exhaust port.

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