Acid mist treatment device and pickling equipment

Abstract

The invention relates to the technical field of acid mist treatment, and provides an acid mist treatment device and pickling equipment, the acid mist treatment device comprises an acid mist discharge pipe, the acid mist discharge pipe is provided with a first inlet and a first outlet which are communicated with each other, and the first inlet is used for being communicated with an outlet of the pickling device; the first outlet is communicated with the containing cavity of the deposition pipe so as to discharge acid mist into the deposition pipe, one end of the deposition pipe is provided with a second outlet communicated with the containing cavity, and the second outlet is used for being communicated with a condenser so that the acid mist in the containing cavity can be discharged into the condenser; at least part of the pipeline, between the first outlet and the second outlet, of the deposition pipe extends in the horizontal direction; the blow-off pipe is provided with a third inlet and a third outlet which are communicated with each other, the third inlet is communicated with the containing cavity at the bottom of a part of the pipeline, extending in the horizontal direction, of the deposition pipe, and the third outlet is used for being connected with an external connecting piece so as to discharge pollutants in the blow-off pipe. According to the scheme, the service life of the condenser is prolonged.

Description

Technical Field

[0001] This invention relates to the field of acid mist treatment technology, and more specifically, to an acid mist treatment device and an acid washing equipment. Background Technology

[0002] In the production and processing of strip steel, pickling is required to remove iron oxide scale from the surface of the strip steel. Pickling generates a large amount of acid mist, which, if directly emitted, will pollute the environment and does not meet relevant environmental standards. Therefore, the acid mist must be purified using acid mist treatment equipment before being released.

[0003] Currently, existing acid mist treatment equipment typically introduces the acid mist generated by the pickling unit directly into the condenser through an acid mist discharge pipe, where the acid mist is condensed to achieve compliant emissions. However, during the transmission of the acid mist through the discharge pipe, some of it condenses into liquid condensate acid, while the acid mist also contains solid impurities (such as particles generated during pickling). These solid impurities flow along the inner wall of the discharge pipe with the condensate acid and eventually enter the condenser along with the acid mist, causing scaling, crystallization blockage, and other malfunctions, thus shortening the condenser's service life. Summary of the Invention

[0004] The problem addressed by this invention is how to extend the service life of condensers.

[0005] To address the above problems, the present invention provides an acid mist treatment device and an acid washing equipment.

[0006] In a first aspect, the present invention provides an acid mist treatment device, comprising an acid mist discharge pipe having a first inlet and a first outlet communicating with each other, the first inlet being connected to the outlet of an acid washing device; a deposition pipe having the first outlet connected to a receiving cavity of the deposition pipe to discharge acid mist into the deposition pipe, one end of the deposition pipe having a second outlet communicating with the receiving cavity, the second outlet being connected to a condenser to discharge the acid mist in the receiving cavity into the condenser, at least a portion of the deposition pipe between the first outlet and the second outlet extending horizontally; and a drain pipe having a third inlet and a third outlet communicating with each other, the third inlet being connected to the receiving cavity at the bottom of the portion of the deposition pipe extending horizontally, the third outlet being connected to an external connector to discharge contaminants from the drain pipe.

[0007] The beneficial effects of the acid mist treatment device of the present invention are: By setting up the above structure, the acid mist exhaust pipe connects the pickling device and the deposition pipe through the interconnected first inlet and first outlet. It can directionally transport the acid mist generated during the pickling process to the deposition pipe, avoiding leakage of acid mist during transmission. This ensures the efficiency of acid mist treatment and prevents acid mist from spreading and polluting the production workshop environment, thereby protecting the health of the operators.

[0008] Secondly, the containment chamber, with at least a portion of the deposition tube extending horizontally, provides ample buffering and separation space for the acid mist. Upon entering the containment chamber, under the influence of gravity, some of the high-temperature acid mist condenses into condensable acid (liquid contaminants), while solid impurities in the acid mist gradually settle to the bottom of the containment chamber, thus preventing contaminants from entering the condenser. Furthermore, the deposition tube connects to the condenser via a second outlet, ensuring that only the separated, clean acid mist is delivered to the condenser. This significantly reduces the risk of scaling, crystallization, and blockage of the condenser's internal heat exchange components, delaying condenser performance degradation and extending the condenser's service life.

[0009] Furthermore, the third inlet of the sewage pipe is connected to the bottom of the sedimentation tube's containment chamber, allowing condensed acid and solid debris that settle to the bottom to be quickly discharged to the external connector through the third outlet. This prevents pollutants from accumulating in the sedimentation tube for extended periods, ensuring that the containment chamber always maintains sufficient separation space and stable separation efficiency. Moreover, the connection of the third outlet to the external connector enables centralized collection of pollutants, facilitating subsequent unified recycling and treatment, preventing secondary pollution caused by indiscriminate discharge of pollutants, and meeting environmental protection requirements.

[0010] In addition, the drain pipe is located upstream of the second outlet to ensure that pollutants are completely discharged before entering the condenser, further improving the cleanliness of the acid mist entering the condenser, minimizing the pollution load on the condenser, and extending the maintenance cycle and service life of the condenser.

[0011] Optionally, the deposition tube includes: a first tube body extending in the horizontal direction, the first tube body having a first chamber and a first connection port at the top and a second connection port at the bottom, the first connection port and the second connection port respectively communicating with the first chamber, the first outlet communicating with the first connection port, and the second connection port communicating with the third inlet; and a second tube body extending in the vertical direction, one end of the second tube body being connected to one end of the first tube body, the other end of the second tube body having a second outlet, the height of the second outlet in the vertical direction being higher than the height of the first connection port in the vertical direction.

[0012] Optionally, the acid mist treatment device includes two acid mist exhaust pipes. The first pipe body includes: a first pipe structure having a first connection port, the first connection port being connected to a first outlet of one of the acid mist exhaust pipes; and a second pipe structure having the first connection port and a second connection port, the end of the second pipe structure away from the first pipe structure being connected to the second pipe body, and the first connection port of the second pipe structure being connected to the first outlet of the other acid mist exhaust pipe.

[0013] Optionally, the end of the first pipe structure away from the second pipe structure is provided with an inspection port that communicates with the first chamber.

[0014] Optionally, the inner diameter of the first pipe structure is larger than the inner diameter of the acid mist discharge pipe.

[0015] Optionally, the inner diameter of the second pipe fitting structure is larger than the inner diameter of the first pipe fitting structure.

[0016] Optionally, a reducing structure is provided between the first pipe fitting structure and the second pipe fitting structure. The two ends of the reducing structure are respectively connected to the first pipe fitting structure and the second pipe fitting structure. The inner diameter of the reducing structure gradually increases from the first pipe fitting structure toward the second pipe fitting structure.

[0017] Optionally, the acid mist treatment device further includes a collection element, and the third outlet is connected to the collection element for discharging pollutants into the collection element.

[0018] Secondly, the present invention provides an acid washing device, including the acid mist treatment device described above.

[0019] Optionally, it further includes: an acid pickling device, the outlet of which is connected to the first inlet of the acid mist treatment device; and a condenser, the inlet of which is connected to the second outlet of the acid mist treatment device.

[0020] The pickling equipment in this embodiment has the same beneficial effects as the acid mist treatment device described above compared to the prior art, and will not be repeated here. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the acid mist treatment device provided in an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: Acid exhaust mist pipe 10, first inlet 11, first outlet 12 20. Deposition pipe; 21. Second outlet; 22. First pipe body; 23. Second pipe body; 24. First pipe fitting structure; 25. Second pipe fitting structure; 26. Inspection port. Sewage pipe 30, third inlet 31, third outlet 32 Variable diameter structure 40, collecting element 50, pickling device 60, condenser 70, horizontal direction X, vertical direction Z. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0024] In the accompanying drawings, the X-axis represents the horizontal direction, and the Z-axis represents the vertical direction. It should also be noted that the aforementioned representations of the X, Y, and Z axes are merely for the convenience of describing the invention and for 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 the invention.

[0025] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0026] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0027] like Figure 1As shown, in a first aspect, the present invention provides an acid mist treatment device, comprising: an acid mist discharge pipe 10 having a first inlet 11 and a first outlet 12 communicating with each other, the first inlet 11 being connected to the outlet of an acid washing device 60; a deposition pipe 20, the first outlet 12 being connected to a receiving cavity of the deposition pipe 20 to discharge acid mist into the deposition pipe 20, one end of the deposition pipe 20 having a second outlet 21 communicating with the receiving cavity, the second outlet 21 being connected to a condenser 70 to discharge acid mist in the receiving cavity into the condenser 70, at least a portion of the deposition pipe 20 extending horizontally between the first outlet 12 and the second outlet 21; and a drain pipe 30 having a third inlet 31 and a third outlet 32 ​​communicating with each other, the third inlet 31 being connected to the receiving cavity at the bottom of the portion of the deposition pipe 20 extending horizontally, and the third outlet 32 ​​being connected to an external connector to discharge contaminants from the drain pipe 30.

[0028] In this embodiment, by setting the above structure, the acid mist discharge pipe 10 realizes the docking of the pickling device 60 and the deposition pipe 20 through the interconnected first inlet 11 and first outlet 12, which can directionally transport the acid mist generated during the pickling process into the deposition pipe 20, avoiding leakage of acid mist during the transmission process. This ensures the efficiency of acid mist treatment and prevents acid mist from spreading and polluting the production workshop environment, so as to protect the health of the operators.

[0029] Secondly, the deposition tube 20 extends at least partially horizontally, providing ample buffering and separation space for the acid mist. After the high-temperature acid mist enters the receiving cavity of the deposition tube 20, under the influence of gravity and the temperature difference with the receiving cavity, some of the high-temperature acid mist condenses into condensed acid (liquid contaminants). Simultaneously, solid impurities in the acid mist gradually settle to the bottom of the receiving cavity of the horizontally extending section of the deposition tube 20, thus preventing contaminants from entering the condenser 70. Furthermore, the deposition tube 20 is connected to the condenser 70 through the second outlet 21, delivering only the separated clean acid mist to the condenser 70. This significantly reduces the risk of scaling, crystallization, and blockage of the heat exchange components inside the condenser 70, delaying the performance degradation of the condenser 70 and thus extending its service life.

[0030] Furthermore, the third inlet 31 of the drain pipe 30 is connected to the bottom of the receiving cavity of a horizontally extending section of the sedimentation pipe 20. This allows the condensed acid and solid debris that settle to the bottom to be quickly discharged to the external connector through the third outlet 32, preventing long-term accumulation of pollutants within the sedimentation pipe 20 and ensuring that the receiving cavity of the sedimentation pipe 20 always maintains sufficient separation space and stable separation efficiency. Moreover, the connection of the third outlet 32 ​​to the external connector enables centralized collection of pollutants, facilitating subsequent unified recycling and treatment, preventing secondary pollution caused by indiscriminate discharge of pollutants, and meeting environmental protection requirements.

[0031] In addition, the drain pipe 30 is connected to a section of sedimentation pipe 20 extending horizontally, and the connection point between the two is located upstream of the second outlet 21 to ensure that pollutants are completely discharged before entering the condenser 70, further improving the cleanliness of acid mist entering the condenser 70, minimizing the pollution load of the condenser 70, and extending the maintenance cycle and service life of the condenser 70.

[0032] In summary, through the synergistic effect of the acid mist discharge pipe 10, the deposition pipe 20, and the sewage discharge pipe 30, pretreatment is performed before the acid mist enters the condenser 70. This pre-separates solid impurities and some of the condensed acid from the acid mist, preventing the condensed acid and solid impurities from directly entering the condenser 70 and causing scaling and blockage. This significantly reduces the pollution load on the condenser 70, slows down the scaling and blockage rate, and thus extends the service life of the condenser 70.

[0033] like Figure 1 As shown, optionally, the deposition tube 20 includes the following interconnected components: a first tube body 22 extending horizontally, the first tube body 22 having a first chamber and a first connection port at the top and a second connection port at the bottom, the first connection port and the second connection port being connected to the first chamber respectively, a first outlet 12 being connected to the first connection port, and the second connection port being connected to the third inlet 31; and a second tube body 23 extending vertically, one end of the second tube body 23 being connected to one end of the first tube body 22, and the other end of the second tube body 23 having a second outlet 21, the second outlet 21 being higher in the vertical direction than the first connection port being higher in the vertical direction.

[0034] By setting up the above structure, the first pipe body 22 extends horizontally, so that after the acid mist enters the first chamber from the acid mist exhaust pipe 10, it provides a stable working environment for the condensed acid and solid impurities in the acid mist to settle fully under the action of gravity.

[0035] Furthermore, the first connection port is located at the top of the first pipe body 22 and is connected to the first outlet 12 of the acid mist exhaust pipe 10. After the acid mist enters the first chamber vertically from above, it will naturally diffuse downward and fill the chamber. During this process, the condensed acid and solid impurities are subject to gravity and can directly settle to the bottom. The initial separation of pollutants and acid mist can be achieved without additional structure. The structure is simple and the separation efficiency is high.

[0036] Furthermore, the second connection port is located at the bottom of the first pipe body 22, which is precisely aligned with the pollutants that have settled to the bottom of the chamber. After connecting with the third inlet 31 of the drain pipe 30, the settled pollutants can be directly discharged in a directional manner, avoiding the accumulation of pollutants in the first chamber and ensuring that the first chamber always maintains a clean separation space and a stable separation effect.

[0037] Secondly, the second tube 23 extends vertically. When the acid mist flows upward in the vertical tube, the remaining fine condensed acid droplets and solid particles will further settle into the first tube 22 under the action of gravity, achieving secondary separation and greatly improving the cleanliness of the acid mist entering the condenser 70. In addition, the second outlet 21 is higher than the first connection port in the vertical direction to form a height difference, which can effectively prevent the condensed acid in the first tube 22 from backflowing due to airflow fluctuations or pressure changes, and avoid the condensed acid from directly entering the condenser 70 and causing scaling.

[0038] like Figure 1 As shown, optionally, the acid mist treatment device includes two acid mist exhaust pipes 10. The first pipe body 22 includes the following interconnected components: a first pipe structure 24 having a first connection port, which is connected to the first outlet 12 of one of the acid mist exhaust pipes 10; and a second pipe structure 25 having a first connection port and a second connection port. The end of the second pipe structure 25 away from the first pipe structure 24 is connected to the second pipe body 23, and the first connection port of the second pipe structure 25 is connected to the first outlet 12 of the other acid mist exhaust pipe 10.

[0039] By setting up the above structure, the two acid mist exhaust pipes 10 can be simultaneously connected to the two acid mist emission ports of the pickling device 60, significantly improving the acid mist delivery capacity per unit time and meeting the processing requirements of large-flow acid mist emissions from large pickling equipment. Furthermore, the two acid mist exhaust pipes 10 split the concentrated acid mist flow into two separate delivery paths, effectively reducing the airflow velocity and pressure within a single acid mist exhaust pipe 10 and preventing airflow turbulence caused by excessive flow in a single pipe.

[0040] Secondly, the first pipe structure 24 is provided with only one first connection port, which connects to one of the acid mist exhaust pipes 10. This can achieve preliminary buffering and diversion of single-path acid mist, avoid the mutual impact and turbulence of airflow caused by the direct convergence of two paths of acid mist, and ensure the flow stability of acid mist in the pipe body.

[0041] Furthermore, the second pipe structure 25 is provided with a first connection port and a second connection port, which can receive acid mist from the acid mist discharge pipe 10 and also receive the acid mist that has been initially separated and transported by the first pipe structure 24, so as to realize the convergence of the two acid mists and allow the two acid mists to mix further in its chamber and complete the secondary sedimentation.

[0042] In this embodiment, the first pipe structure 24 and the second pipe structure 25 are integrally formed.

[0043] Optionally, the end of the first pipe structure 24 away from the second pipe structure 25 is provided with an inspection port 26 that communicates with the first chamber.

[0044] By designing the above structure, the first pipe structure 24 will preferentially settle some large solid particles and condensed acid, which are prone to accumulation in the chamber after long-term operation. The inspection port 26 is directly connected to the first chamber and is located at an independent end away from the second pipe structure 25. It can be directly inserted into the chamber through the inspection port 26 to quickly clean up the accumulated contaminants, avoiding blockage caused by contaminants. This ensures that the first pipe structure 24 always maintains sufficient separation space and a smooth airflow path, maintaining a stable separation effect.

[0045] Optionally, the inner diameter of the first pipe structure 24 is greater than or equal to the inner diameter of the acid mist discharge pipe 10.

[0046] By setting up the above structure, when acid mist enters the first pipe structure 24 from the acid mist discharge pipe 10, the flow cross-sectional area of ​​the airflow increases due to the larger inner diameter of the first pipe structure 24. According to the principle of fluid mechanics, the flow velocity of the acid mist will naturally decrease. This provides more time for the large solid particles and condensed acid droplets entrained in the acid mist to settle due to gravity, and avoids the pollutants from passing through the first pipe structure 24 due to excessive flow velocity. This greatly improves the separation effect of the first pipe structure 24 and reduces the separation pressure of the subsequent second pipe structure 25.

[0047] Optionally, the inner diameter of the second pipe fitting structure 25 is larger than the inner diameter of the first pipe fitting structure 24.

[0048] By setting the above structure, the second pipe structure 25 needs to simultaneously receive two streams of acid mist. One stream is the acid mist that has been initially separated by the first pipe structure 24, and the other stream is the acid mist from the acid mist exhaust pipe 10 that is directly connected to its first connection port. After the two streams of acid mist converge, their flow rates are superimposed. If the inner diameter of the second pipe structure 25 is the same as that of the first pipe structure 24, it will cause the airflow inside the pipe to impact each other and form turbulence. However, the larger inner diameter significantly increases the cross-sectional area of ​​the airflow. According to the principles of fluid mechanics, this can offset the increase in flow velocity caused by the superposition of flow rates, allowing the converged acid mist to maintain a stable flow velocity and preventing the turbulent airflow from causing the settled pollutants to be re-raised, thus ensuring the stability of the separation process.

[0049] Optionally, a reducing structure 40 is provided between the first pipe structure 24 and the second pipe structure 25. The two ends of the reducing structure 40 are connected to the first pipe structure 24 and the second pipe structure 25 respectively. The inner diameter of the reducing structure 40 gradually increases from the first pipe structure 24 toward the second pipe structure 25.

[0050] By setting the above structure, the variable diameter structure 40 allows the airflow cross-sectional area to increase linearly and the flow velocity to decrease gradually when the acid mist enters the second pipe with a larger inner diameter from the first pipe with a smaller inner diameter. This can prevent problems such as airflow vortices and impact collisions caused by sudden changes in pipe diameter when the first pipe structure 24 and the second pipe structure 25 are directly connected, thereby ensuring the continuity and stability of the separation process.

[0051] Optionally, the acid mist treatment device also includes a collection element 50, with a third outlet 32 ​​connected to the collection element 50 for discharging pollutants into the collection element 50.

[0052] By setting up the above structure, the collection component 50 serves as a storage carrier for pollutants, which can collect all the condensed acid and solid debris discharged from the sewage pipe 30, preventing pollutants from being directly discharged to the workshop floor, soil, or sewers. This completely eliminates secondary pollution problems such as acid corrosion of the ground, water pollution, and the release of harmful gases, and strictly complies with industrial environmental emission standards and clean production requirements in the workshop.

[0053] In this embodiment, the collection component 50 is specifically a collection tank.

[0054] Secondly, the present invention provides an acid washing device, including the acid mist treatment device described above.

[0055] Optionally, it also includes: a pickling device 60, the outlet of which is connected to the first inlet 11 of the acid mist treatment device; and a condenser 70, the inlet of which is connected to the second outlet 21 of the acid mist treatment device.

[0056] By setting up the above structure, the outlet of the pickling device 60 is directly connected to the first inlet 11 of the acid mist treatment device, which avoids the spread and leakage of acid mist in the workshop, controls acid mist pollution from the source, protects the health of operators, maintains a clean production environment in the workshop, and meets industrial hygiene standards. The inlet of the condenser 70 is connected to the second outlet 21 of the acid mist treatment device, and only receives clean acid mist that has been pretreated by the deposition pipe 20 and the drain pipe 30 to remove most of the condensed acid and solid impurities. This can prevent the condenser 70 from being blocked by impurities and extend the service life of the condenser 70.

[0057] The pickling equipment in this embodiment has the same beneficial effects as the acid mist treatment device described above compared to the prior art, and will not be repeated here.

[0058] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An acid mist treatment device, characterized in that, include: Acid mist discharge pipe (10) has a first inlet (11) and a first outlet (12) that are interconnected. The first inlet (11) is used to connect with the outlet of the pickling device (60). A deposition tube (20) has a first outlet (12) connected to the receiving cavity of the deposition tube (20) to discharge acid mist into the deposition tube (20). One end of the deposition tube (20) is provided with a second outlet (21) connected to the receiving cavity. The second outlet (21) is used to communicate with a condenser (70) so that the acid mist in the receiving cavity is discharged into the condenser (70). At least a portion of the deposition tube (20) between the first outlet (12) and the second outlet (21) extends horizontally. The drain pipe (30) has a third inlet (31) and a third outlet (32) that are interconnected. The third inlet (31) is connected to the receiving cavity at the bottom of the portion of the pipeline that extends horizontally in the sedimentation pipe (20). The third outlet (32) is used to connect to an external component to discharge contaminants from the drain pipe (30).

2. The acid mist treatment device according to claim 1, characterized in that, The deposition tube (20) comprises interconnected components: The first tube (22) extends along the horizontal direction. The first tube (22) has a first chamber and a first connection port at the top and a second connection port at the bottom. The first connection port and the second connection port are respectively connected to the first chamber. The first outlet (12) is used to connect to the first connection port, and the second connection port is used to connect to the third inlet (31). The second tube (23) extends vertically, one end of the second tube (23) is connected to one end of the first tube (22), and the other end of the second tube (23) has a second outlet (21), the height of the second outlet (21) in the vertical direction is higher than the height of the first connection port in the vertical direction.

3. The acid mist treatment device according to claim 2, characterized in that, The acid mist treatment device includes two acid mist exhaust pipes (10), and the first pipe body (22) includes interconnected components: The first pipe structure (24) has the first connection port, which is connected to the first outlet (12) of one of the acid mist discharge pipes (10); The second pipe structure (25) has the first connection port and the second connection port. The end of the second pipe structure (25) away from the first pipe structure (24) is connected to the second pipe body (23). The first connection port of the second pipe structure (25) is connected to the first outlet (12) of the other acid mist discharge pipe (10).

4. The acid mist treatment device according to claim 3, characterized in that, The first pipe structure (24) has an inspection port (26) connected to the first chamber at the end away from the second pipe structure (25).

5. The acid mist treatment device according to claim 3, characterized in that, The inner diameter of the first pipe structure (24) is larger than the inner diameter of the acid mist discharge pipe (10).

6. The acid mist treatment device according to claim 3, characterized in that, The inner diameter of the second pipe structure (25) is larger than the inner diameter of the first pipe structure (24).

7. The acid mist treatment device according to claim 3, characterized in that, A variable diameter structure (40) is provided between the first pipe fitting structure (24) and the second pipe fitting structure (25). The two ends of the variable diameter structure (40) are respectively connected to the first pipe fitting structure (24) and the second pipe fitting structure (25). The inner diameter of the variable diameter structure (40) gradually increases from the first pipe fitting structure (24) toward the second pipe fitting structure (25).

8. The acid mist treatment device according to claim 1, characterized in that, The acid mist treatment device further includes a collection element (50), and the third outlet (32) is connected to the collection element (50) for discharging pollutants into the collection element (50).

9. A pickling device, characterized in that, Includes the acid mist treatment apparatus as described in any one of claims 1 to 8.

10. The pickling equipment according to claim 9, characterized in that, Also includes: A pickling device (60), the outlet of which is connected to the first inlet (11) of the acid mist treatment device; A condenser (70) is provided, the inlet of which is connected to the second outlet (21) of the acid mist treatment device.

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