Venturi scrubbing tower for scrubbing flue gas and use method thereof

Abstract

The invention belongs to the field of flue gas treatment, and particularly relates to a Venturi scrubbing tower for scrubbing flue gas and a using method thereof.The Venturi scrubbing tower comprises a scrubbing tower body and a filler body, and the filler body is located in the scrubbing tower body; the filler body is provided with an annular outer wall and an internal through hole, a surface self-cleaning unit is arranged on the annular outer wall, an internal dead-corner-free unit is arranged at the internal through hole, and the self-cleaning unit and the internal dead-corner-free unit do not interfere with each other and form a synergistic flow guide relationship; the surface self-cleaning unit is arranged on the annular outer wall of the filler body, and the internal dead-corner-free unit is arranged in the internal through hole, so that the internal flow guide structure and the external flow guide structure are mutually independent and work cooperatively, liquid flow interference and flow field turbulence are avoided in structural design, gas-liquid two-phase stable circulation is realized, and the mass transfer efficiency and the operation reliability of the filler are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment, specifically a Venturi scrubbing tower for scrubbing flue gas. Background Technology

[0002] Venturi scrubbers are a type of wet scrubber. Wet scrubbers, also called wet scrubbing scrubbers, separate dust particles from the airflow through contact and impact between dust-laden gas and liquid droplets or films. Wet scrubbers can purify both solid particulate pollutants and gaseous pollutants (gas absorption) from exhaust gases, while also cooling the gas. They are characterized by low investment, simple construction, and high purification efficiency. The equipment itself generally has no moving parts and is suitable for purifying various types of non-fibrous dust that does not chemically react with water or agglomerate, especially suitable for purifying high-temperature, flammable, explosive, and harmful gases.

[0003] Existing Venturi scrubbers primarily use conventional annular or porous packing materials. During long-term operation, stable vortex dead zones and low-speed stagnation areas easily form in the internal through-hole regions. Dust from the flue gas and impurities from the scrubbing liquid continuously collide, deposit, and adhere in these vortex and low-speed zones, gradually accumulating into a dense scale layer on the inner wall of the channels. As operating time increases, the scale layer continues to thicken, directly causing a continuous reduction in the effective flow cross-section of the packing's through-holes and a significant decrease in the mass transfer area. Simultaneously, traditional packing materials lack internal guiding and self-draining structures, preventing the effective removal of residual liquid and deposits within the channels, further exacerbating blockage and caking. Ultimately, this leads to overall packing failure, a sharp increase in system resistance, and a significant decrease in scrubbing efficiency, necessitating shutdown for cleaning or complete packing replacement. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, such as the tendency for stable vortex dead zones and low-speed stagnation zones to form in the internal through-hole region, leading to a continuous reduction in the effective flow cross-section of the packing through-hole and a significant decrease in the mass transfer area, this invention proposes a Venturi scrubbing tower for scrubbing flue gas and its usage method.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a Venturi scrubbing tower for scrubbing flue gas, comprising:

[0006] The washing tower body and the packing body, wherein the packing body is located inside the washing tower body;

[0007] The packing body has an annular outer wall and an internal through hole. The annular outer wall is provided with a surface self-cleaning unit, and the internal through hole is provided with an internal dead-angle-free unit. The surface self-cleaning unit and the internal dead-angle-free unit do not interfere with each other and form a cooperative flow guiding relationship.

[0008] Furthermore, the surface self-cleaning unit includes an adjusting boss, a self-cleaning guide groove, a V-shaped liquid film tearing groove, and micro-flow interruption ribs, all of which are integrally formed and set on the annular outer wall.

[0009] Furthermore, the adjusting boss is located at the edge of the annular outer wall and at the top of the annular outer wall. The self-cleaning guide channel is located below the adjusting boss. The self-cleaning guide channel and the adjusting boss are staggered and interconnected. The adjusting boss can guide liquid into the self-cleaning guide channel.

[0010] Furthermore, the V-shaped liquid film tearing groove is located below the self-cleaning guide chute and is interconnected, and can receive the liquid guided by the self-cleaning guide chute. The micro-flow interruption ribs are arranged in a staggered manner along the axial direction, and the V-shaped liquid film tearing groove is opened between two adjacent micro-flow interruption ribs.

[0011] Furthermore, the internal dead-angle-free unit includes a tapered through-hole, an annular flow guide boss, and a dead-angle elimination protrusion. The tapered through-hole is a through-hole that penetrates the packing body, and the annular flow guide boss is disposed on the inner wall of the tapered through-hole.

[0012] Furthermore, an annular guide groove is provided at the air outlet port of the gradient conical through hole. The annular guide groove can discharge the residual liquid and impurities on the inner wall of the gradient conical through hole to the V-shaped liquid film tearing groove on the outer wall of the annulus, so as to realize the coordinated guidance of the internal dead-angle unit and the surface self-cleaning unit.

[0013] Furthermore, the annular guide boss is completely separated from the adjustment boss on the annular outer wall to avoid overlap and interference.

[0014] Furthermore, the annular outer wall is radially divided into two regions: an outer layer and an inner layer. The outer layer is equipped with adjusting bosses and self-cleaning guide grooves, while the inner layer is equipped with micro-flow interruption ribs and V-shaped liquid film tearing grooves. The outer layer and the inner layer do not overlap.

[0015] Furthermore, the dead angle elimination protrusion is disposed on the inner wall of the packing body. The dead angle elimination protrusion works in conjunction with the annular flow guiding protrusion on the inner wall of the tapered through hole to eliminate the dead angle vortex area inside the packing body, and does not interfere with the surface self-cleaning unit on the annular outer wall.

[0016] A method for using a Venturi scrubbing tower for washing flue gas includes the following steps:

[0017] S1, Preliminary preparation: Install the packing body inside the main body of the washing tower, ensuring that the annular outer wall of the packing body and the inner wall of the main body of the washing tower are kept at a reasonable gap to avoid structural interference and ensure smooth gas-liquid flow;

[0018] S2, Liquid Guidance: Start the main body of the scrubbing tower. The liquid is guided by the working condition adaptation adjustment boss and flows into the self-cleaning guide chute. Then, it is guided to the V-shaped liquid film tearing chute through the self-cleaning guide chute to achieve the initial distribution of liquid.

[0019] S3, Liquid film treatment: The liquid is torn into tiny droplets by a V-shaped liquid film tearing groove, increasing the contact area with the flue gas;

[0020] S4, Internal flow guidance: The liquid in the gradient conical through-hole is guided by the annular flow guide boss and discharged to the V-shaped liquid film tearing groove through the annular flow guide groove, forming a synergy with the surface self-cleaning unit;

[0021] S5, Operating Condition Adaptation: Adjusts the liquid flow rate according to the spray volume inside the main body of the scrubbing tower. By adjusting the guiding effect of the protrusion, it adapts to the liquid flow requirements under different operating conditions, ensuring that the liquid flows along the preset path without splashing.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] 1. This invention, by setting a surface self-cleaning unit on the annular outer wall of the packing body and setting an internal dead-angle-free unit in the internal through holes, enables the internal and external flow guiding structures to work independently and collaboratively. The structural design avoids liquid flow interference and flow field turbulence, achieving stable gas-liquid two-phase flow and significantly improving the mass transfer efficiency and operational reliability of the packing. The integrated structure of adjusting bosses, self-cleaning guide grooves, V-shaped liquid film tearing grooves, and micro-flow interruption ribs allows for orderly reception, directional guidance, uniform distribution, and efficient tearing of the sprayed liquid, resulting in a continuous, stable, and uniformly distributed liquid film. This significantly increases the gas-liquid contact area and washing effect, solving the problems of uneven liquid film, easy flow interruption, and easy splashing in traditional packing. The V-shaped liquid film tearing grooves, in conjunction with the micro-flow interruption ribs, actively tear the continuous liquid film into a uniform liquid film and fine droplets, enhancing the renewal of the mass transfer interface and avoiding phenomena such as excessively thick liquid film, local stagnation, and scaling, thereby improving the removal efficiency of dust and pollutants from flue gas. By combining the gradually tapered through-holes, annular guide bosses, and dead-angle elimination bumps, the vortex zone, low-speed stagnation zone, and flow dead angle inside the packing can be completely eliminated, preventing dust from accumulating, caking, and clogging in the channels, keeping the flow channels unobstructed for a long time, and extending the service life of the packing.

[0024] 2. This invention utilizes an annular guide channel on the outlet side of a gradually tapered through-hole to direct residual liquid and trace impurities to the outer wall self-cleaning unit, achieving closed-loop flow guidance and synchronous cleaning of the internal and external channels. This prevents internal liquid accumulation, scaling, and fouling, thus realizing the self-cleaning function of the packing material. The design, with complete separation of internal and external structures and radial partitioning, ensures that the surface self-cleaning unit and the internal dead-angle-free unit do not overlap or interfere with each other, eliminating problems such as increased flow resistance, liquid flow collision, and chaotic flow field caused by structural interference, thereby reducing system energy consumption. Adjustable bosses enable adaptive flow guidance under different operating conditions, maintaining stable, non-splashing, and continuous liquid flow under varying spray volumes and flue gas velocities. This enhances the device's adaptability to load fluctuations and ensures long-term stable and compliant operation. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of a Venturi scrubbing tower for washing flue gas and its usage method according to the present invention.

[0027] Figure 2 This is a schematic diagram of the planar structure of a Venturi scrubbing tower for washing flue gas and its usage method according to the present invention.

[0028] Figure 3 This invention relates to a Venturi scrubbing tower for scrubbing flue gas and its method of use. Figure 2 Enlarged structural diagram at point A in the middle;

[0029] Figure 4 This is a schematic diagram of the surface self-cleaning unit and the internal dead-angle-free unit structure of a Venturi scrubbing tower for washing flue gas and its usage method according to the present invention.

[0030] Figure 5 This is a schematic diagram of the packing body structure of a Venturi scrubbing tower for washing flue gas and its usage method according to the present invention.

[0031] Figure 6 This is a schematic diagram of the packing body structure of a Venturi scrubbing tower for washing flue gas and its usage method according to the present invention.

[0032] Figure 7 This is a partial structural schematic diagram of a Venturi scrubbing tower for washing flue gas and its usage method according to the present invention.

[0033] Figure 8 This invention relates to a Venturi scrubbing tower for scrubbing flue gas and its method of use. Figure 7 Enlarged structural diagram at point B.

[0034] In the diagram: 100, main body of the scrubbing tower; 200, packing body; 300, surface self-cleaning unit; 310, adjusting boss; 320, self-cleaning guide groove; 330, V-shaped liquid film tearing groove; 340, micro-flow interruption rib; 400, internal dead-angle-free unit; 410, gradient conical through hole; 420, annular guide boss; 430, annular guide groove; 440, dead-angle elimination protrusion. Detailed Implementation

[0035] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figures 1-8 As shown, a Venturi scrubbing tower for scrubbing flue gas includes:

[0037] The washing tower body 100 and the packing body 200 are located inside the washing tower body 100.

[0038] The packing body 200 has an annular outer wall and an internal through hole. The annular outer wall is provided with a surface self-cleaning unit 300, and the internal through hole is provided with an internal dead-angle-free unit 400. The surface self-cleaning unit 300 and the internal dead-angle-free unit 400 do not interfere with each other and form a cooperative flow guiding relationship.

[0039] Specifically, the packing body 200 is assembled inside the scrubbing tower body 100, ensuring its stable placement. During tower operation, the sprayed liquid falls from top to bottom onto the surface of the packing body 200, while the flue gas flows from bottom to top through it. When the liquid flows in the annular outer wall region of the packing body 200, it is guided, distributed, and treated with a liquid film by the surface self-cleaning unit 300; when flowing in the internal through-hole region, it is regulated and guided by the internal dead-angle-free unit 400. The surface self-cleaning unit 300 and the internal dead-angle-free unit 400 operate independently, without overlap or interference, forming a coordinated internal and external flow guiding relationship. This ensures stable flow of liquid and flue gas along a preset path, preventing liquid stagnation, impurity accumulation, and gas-liquid short-circuiting. This solves the problems of interference between the internal and external structures of traditional packing materials, chaotic liquid flow paths, easy fouling, easy clogging, and poor gas-liquid contact.

[0040] The surface self-cleaning unit 300 includes an adjustment boss 310, a self-cleaning guide groove 320, a V-shaped liquid film tearing groove 330, and a micro-flow interruption rib 340, all of which are integrally formed on the annular outer wall.

[0041] Specifically, after the sprayed liquid falls onto the annular outer wall of the packing body 200, it flows sequentially through the adjusting boss 310, the self-cleaning guide channel 320, the V-shaped liquid film tearing channel 330, and the micro-flow interruption rib 340. These structures are integrally formed with the annular outer wall, without any additional seams. The liquid flows downwards along the continuous structure, preventing local accumulation, splashing, and flow interruption. The adjusting boss 310 receives the initial liquid flow, the self-cleaning guide channel 320 completes the liquid transport, the V-shaped liquid film tearing channel 330 tears and refines the liquid film, and the micro-flow interruption rib 340 constrains the liquid film morphology, ensuring that the liquid forms a stable and uniform washing liquid film on the annular outer wall. This solves the problems of traditional packing materials lacking a flow guiding structure on the surface, uneven liquid film distribution, and easy scaling.

[0042] The adjusting boss 310 is located at the edge of the annular outer wall and at the top of the annular outer wall. The self-cleaning guide channel 320 is located below the adjusting boss 310. The self-cleaning guide channel 320 and the adjusting boss 310 are staggered and interconnected. The adjusting boss 310 can guide liquid into the self-cleaning guide channel 320.

[0043] Specifically, the liquid first reaches the adjusting boss 310 at the top of the annular outer wall. The adjusting boss 310 receives and guides the falling liquid, stably introducing the liquid flow into the self-cleaning guide chute 320 below. The adjusting boss 310 and the self-cleaning guide chute 320 are staggered and interconnected, allowing the liquid to smoothly enter the self-cleaning guide chute 320 without slipping out of the outer wall or experiencing excessive local scouring. Under different spray volumes, the adjusting boss 310 can stably guide the liquid into the self-cleaning guide chute 320, maintaining a continuous and stable liquid flow. This solves the problems of traditional liquid inlets lacking guidance, instability, and easy splashing, as well as the wear of the packing material caused by strong local scouring.

[0044] The V-shaped liquid film tearing groove 330 is located below the self-cleaning guide groove 320 and is interconnected. It can receive the liquid diverted by the self-cleaning guide groove 320. The micro-flow interruption ribs 340 are arranged in a staggered manner along the axial direction. The V-shaped liquid film tearing groove 330 is opened between two adjacent micro-flow interruption ribs 340.

[0045] Specifically, the self-cleaning guide chute 320 smoothly delivers the liquid to the connected V-shaped liquid film tearing chute 330 below. Upon entering the chute, the liquid is torn by the chute structure, forming a uniformly distributed liquid film and fine droplets. Micro-flow interruption ribs 340 are axially offset on the annular outer wall, and the V-shaped liquid film tearing chute 330 is located between adjacent micro-flow interruption ribs 340. The micro-flow interruption ribs 340 limit excessive liquid film extension, preventing the liquid film from becoming too thick or too thin. Under the combined action of the V-shaped liquid film tearing chute 330 and the micro-flow interruption ribs 340, the liquid film remains stable, ensuring full contact with the rising flue gas and improving mass transfer and washing effects. This solves the problems of uneven liquid film distribution, excessive thickness or thinness, small mass transfer area, and the formation of localized stagnant water areas.

[0046] The internal dead-angle-free unit 400 includes a tapered through hole 410, an annular flow guide boss 420, and a dead-angle elimination protrusion 440. The tapered through hole 410 is through and penetrates the packing body 200. The annular flow guide boss 420 is disposed on the inner wall of the tapered through hole 410, and the dead-angle elimination protrusion 440 is disposed on the inner wall of the packing body 200.

[0047] Specifically, flue gas and some liquid enter the gradually tapered through-hole 410 of the packing body 200 and flow along the axial direction of the through-hole. The annular guide protrusion 420 on the inner wall of the through-hole continuously guides the gas-liquid two-phase flow, ensuring orderly flow along the through-hole wall. The dead-angle elimination protrusion 440 on the inner wall of the packing body 200 cooperates with the annular guide protrusion 420 to disturb and reshape the flow field, eliminating low-velocity zones, backflow zones, and vortex dead angles within the through-hole. The gas and liquid phases pass stably in a dead-angle-free flow field, preventing the accumulation of dust and impurities locally. This solves the problems of vortex dead angles, easy dust accumulation, easy clogging of channels, and gradually decreasing flow area within the through-holes of the packing.

[0048] An annular guide groove 430 is provided at the air outlet port of the tapered through hole 410. The annular guide groove 430 can discharge the residual liquid and impurities on the inner wall of the tapered through hole 410 to the V-shaped liquid film tearing groove 330 on the outer wall of the annular shape, so as to realize the coordinated flow guidance of the internal dead-angle unit 400 and the surface self-cleaning unit 300.

[0049] Specifically, residual liquid and a small amount of entrained impurities on the inner wall of the gradient conical through-hole 410 converge towards the outlet port under the guidance of the annular guide protrusion 420. The converged liquid and impurities enter the annular guide groove 430 at the port location, which directs them to the V-shaped liquid film tearing groove 330 on the annular outer wall. After the internal liquid and impurities merge into the liquid flow on the outer wall, they flow downwards along with the surface liquid film and carry out the packing material, achieving coordinated flow guidance between the internal dead-angle unit 400 and the surface self-cleaning unit 300. This solves the problems of residual liquid inside the packing material not being able to drain, liquid accumulation and scaling, clogging of channels, and reduced washing efficiency.

[0050] The annular guide boss 420 is completely separated from the adjustment boss 310 on the annular outer wall to avoid overlap and interference.

[0051] Specifically, the annular guide boss 420 is arranged on the inner wall of the gradually tapered through-hole 410, and the adjusting boss 310 is arranged on the edge of the annular outer wall. The two positions are completely separated, with no overlap or intersection. The liquid flows along its own independent path within the internal through-hole and on the annular outer wall, ensuring that the internal and external flow fields do not interfere with each other, preventing liquid flow collisions, mutual obstruction, or increased resistance. The internal and external guide structures each perform their respective functions, ensuring smooth and stable overall flow. This solves the problems of overlapping and interference between internal and external guide structures, turbulent liquid flow, high flow resistance, and high operating energy consumption.

[0052] The annular outer wall is divided into two regions along the radial direction: an outer layer and an inner layer. The outer layer is equipped with an adjustment boss 310 and a self-cleaning guide groove 320, while the inner layer is equipped with a micro-flow interruption rib 340 and a V-shaped liquid film tearing groove 330. The outer and inner layers do not overlap.

[0053] Specifically, the annular outer wall is radially divided into two independent regions: an outer layer and an inner layer. The outer layer is equipped with adjusting bosses 310 and self-cleaning guide channels 320, primarily for liquid reception and initial guidance. The inner layer is equipped with micro-flow interruption ribs 340 and V-shaped liquid film tearing channels 330, primarily for liquid film tearing and uniform distribution. The outer and inner layer structures do not overlap or interfere with each other. After being guided in the outer layer, the liquid smoothly transitions into the inner layer for processing, resulting in a clear flow path and smooth flow. This solves the problems of dense structures in a single region, chaotic liquid flow, severe interference, and reduced self-cleaning effectiveness.

[0054] The dead angle elimination protrusion 440 is set on the inner wall of the packing body 200. The dead angle elimination protrusion 440 works in conjunction with the annular guide protrusion 420 on the inner wall of the tapered through hole 410 to eliminate the dead angle vortex area inside the packing body 200, and does not interfere with the surface self-cleaning unit 300 on the annular outer wall.

[0055] Specifically, the dead-angle elimination protrusion 440 and the annular flow-guiding protrusion 420 on the inner wall of the tapered through-hole 410 work together to continuously adjust the flow field inside the through-hole, completely eliminating vortex dead angles and low-speed stagnation zones. The internal structure and the surface self-cleaning unit 300 on the annular outer wall remain separate and do not interfere with each other. Internal flow is achieved without dead angles, and external self-cleaning guidance is achieved, resulting in a state of no dust accumulation, no blockage, and long-term stable operation. This solves the problems of vortex dust accumulation inside the packing, pore blockage failure, short service life, and frequent maintenance.

[0056] A method for using a Venturi scrubbing tower for washing flue gas includes the following steps:

[0057] S1. Preliminary preparation: Install the packing body 200 inside the scrubbing tower body 100, ensuring that the annular outer wall of the packing body 200 and the inner wall of the scrubbing tower body 100 maintain a reasonable gap to avoid structural interference and ensure smooth gas-liquid flow.

[0058] S2, Liquid guidance: Start the main body of the scrubbing tower 100. The liquid is guided by the working condition adaptation adjustment boss 310 and flows into the self-cleaning guide chute 320. Then, it is guided to the V-shaped liquid film tearing chute 330 through the self-cleaning guide chute 320 to achieve the initial distribution of liquid.

[0059] S3, Liquid film treatment: The liquid is torn into fine droplets by the V-shaped liquid film tearing groove 330 to increase the contact area with the flue gas;

[0060] S4, Internal flow guidance: The liquid in the gradient conical through-hole 410 is guided by the annular guide boss 420 and discharged to the V-shaped liquid film tearing groove 330 through the annular guide groove 430, forming a synergy with the surface self-cleaning unit 300.

[0061] S5, Operating Condition Adaptation: Adjust the liquid flow rate according to the spray volume within the main body 100 of the scrubbing tower. By adjusting the guiding effect of the boss 310, adapt to the liquid flow requirements under different operating conditions, ensuring that the liquid flows along the preset path without splashing.

[0062] Specifically, S1 Preliminary Preparation: The packing body 200 is installed into the main body 100 of the scrubbing tower. The position is adjusted to maintain a reasonable gap between the annular outer wall and the tower wall, ensuring smooth gas-liquid flow and preventing structural interference. S2 Liquid Guidance: The scrubbing tower is started, and the sprayed liquid falls to the adjusting boss 310. It is then guided by the boss into the self-cleaning guide chute 320, and then transported by the chute to the V-shaped liquid film tearing chute 330, completing the orderly distribution of the liquid. S3 Liquid Film Treatment: After entering the V-shaped liquid film tearing chute 330, the liquid is torn and refined to form a uniform liquid film, increasing the contact area with the flue gas and improving the scrubbing and purification effect. S4 Internal Guidance: The liquid and impurities in the gradient conical through-hole 410 are guided by the annular guide boss 420 into the annular guide chute 430, and then discharged to the V-shaped liquid film tearing chute 330 on the outer wall, achieving coordinated internal and external guidance and cleaning. S5 Operating Condition Adaptation: Adjusts the liquid flow rate according to the actual spray volume, and utilizes the stabilizing guiding effect of the adjusting boss 310 to adapt to different operating conditions, ensuring that the liquid always flows along the preset path without splashing, interrupting the flow, or accumulating. This achieves self-cleaning of the packing material, no internal dead corners, no clogging of the channels, stable operation, high washing efficiency, and long service life, reducing maintenance frequency and operating costs.

[0063] 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 illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A Venturi scrubbing tower for scrubbing flue gas, characterized in that, include: The washing tower body (100) and the packing body (200) are located inside the washing tower body (100); The packing body (200) has an annular outer wall and an internal through hole. The annular outer wall is provided with a surface self-cleaning unit (300), and the internal through hole is provided with an internal dead-angle-free unit (400). The surface self-cleaning unit (300) and the internal dead-angle-free unit (400) do not interfere with each other and form a cooperative flow guiding relationship.

2. The Venturi scrubbing tower for scrubbing flue gas according to claim 1, characterized in that: The surface self-cleaning unit (300) includes an adjustment boss (310), a self-cleaning guide groove (320), a V-shaped liquid film tearing groove (330), and a micro-flow interruption rib (340), all of which are integrally formed on the annular outer wall.

3. The Venturi scrubbing tower for scrubbing flue gas according to claim 2, characterized in that: The adjusting boss (310) is located at the edge of the annular outer wall and at the top of the annular outer wall. The self-cleaning guide channel (320) is located below the adjusting boss (310). The self-cleaning guide channel (320) and the adjusting boss (310) are staggered and interconnected. The adjusting boss (310) can guide liquid into the self-cleaning guide channel (320).

4. The Venturi scrubbing tower for scrubbing flue gas according to claim 2, characterized in that: The V-shaped liquid film tear groove (330) is located below the self-cleaning guide groove (320) and is interconnected. It can receive the liquid diverted by the self-cleaning guide groove (320). The micro-flow interruption ribs (340) are arranged in a staggered manner along the axial direction. The V-shaped liquid film tear groove (330) is opened between two adjacent micro-flow interruption ribs (340).

5. The Venturi scrubbing tower for scrubbing flue gas according to claim 2, characterized in that: The internal dead-angle-free unit (400) includes a tapered through hole (410), an annular guide boss (420), and a dead-angle elimination bump (440). The tapered through hole (410) is through and penetrates the packing body (200). The annular guide boss (420) is located on the inner wall of the tapered through hole (410).

6. The Venturi scrubbing tower for scrubbing flue gas according to claim 5, characterized in that: An annular guide groove (430) is provided at the outlet port of the gradient conical through hole (410). The annular guide groove (430) can discharge the residual liquid and impurities on the inner wall of the gradient conical through hole (410) to the V-shaped liquid film tear groove (330) on the outer wall of the annular structure, so as to realize the coordinated flow guidance of the internal dead-angle unit (400) and the surface self-cleaning unit (300).

7. The Venturi scrubbing tower for scrubbing flue gas according to claim 2, characterized in that: The annular guide boss (420) is completely separated from the adjustment boss (310) on the annular outer wall to avoid overlap and interference.

8. The Venturi scrubbing tower for scrubbing flue gas according to claim 3, characterized in that: The annular outer wall is divided into two regions along the radial direction: an outer layer and an inner layer. The outer layer is provided with an adjustment boss (310) and a self-cleaning guide groove (320). The inner layer is provided with a micro-flow interruption rib (340) and a V-shaped liquid film tearing groove (330). The outer layer and the inner layer do not overlap.

9. The Venturi scrubbing tower for scrubbing flue gas according to claim 5, characterized in that: The dead angle elimination protrusion (440) is set on the inner wall of the packing body (200). The dead angle elimination protrusion (440) cooperates with the annular guide protrusion (420) on the inner wall of the tapered through hole (410) to eliminate the dead angle vortex area inside the packing body (200) and does not interfere with the surface self-cleaning unit (300) on the annular outer wall.

10. A method of using a Venturi scrubbing tower for washing flue gas, applicable to the Venturi scrubbing tower for washing flue gas as described in any one of claims 1-9, characterized in that, Includes the following steps: S1, Preliminary preparation: Install the packing body (200) inside the washing tower body (100) to ensure that the annular outer wall of the packing body (200) and the inner wall of the washing tower body (100) maintain a reasonable gap to avoid structural interference and ensure smooth gas-liquid flow; S2, Liquid guidance: Start the main body of the scrubbing tower (100), and the liquid is guided by the working condition adaptation adjustment boss (310) and flows into the self-cleaning guide chute (320). Then, it is guided to the V-shaped liquid film tearing chute (330) through the self-cleaning guide chute (320) to achieve the initial distribution of liquid. S3, Liquid film treatment: The liquid is torn into small droplets by a V-shaped liquid film tearing groove (330) to increase the contact area with the flue gas; S4, Internal flow guidance: The liquid in the gradient conical through hole (410) is guided by the annular flow guide boss (420) and discharged to the V-shaped liquid film tearing groove (330) through the annular flow guide groove (430), forming a synergy with the surface self-cleaning unit (300); S5, Working Condition Adaptation: Adjust the liquid flow rate according to the spray volume in the main body (100) of the washing tower. By adjusting the guiding effect of the boss (310), adapt to the liquid flow requirements under different working conditions, and ensure that the liquid flows along the preset path without splashing.

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