An acid mist purification device for an acid pickling line

Abstract

This utility model discloses an acid mist purification device for a pickling unit, relating to the field of acid mist purification devices. It addresses the problem in existing technologies where acid mist is purified by being sprayed out in opposite directions, but the spray volume of the acid and alkali mist is difficult to control, leading to incomplete purification or the generation of alkali mist when the ratio of the two mists is uneven. A dispersion plate is fixedly connected to the lower center of the purification chamber. The dispersion plate has multiple gas dispersion holes arranged in an array. A rotating air guide pipe is rotatably connected between the first and second limiting tubes. The lower end of the rotating air guide pipe extends through the interior of the second limiting tube and out of the lower end face of the dispersion plate. By setting up a dual dispersion structure of the rotating air guide pipe and the dispersion plate, combined with the synchronous rotation of the first and second stirring rods, multi-stage dispersion of the acid mist can be achieved, significantly improving the contact area and reaction efficiency between the acid mist and the alkali solution, ensuring more thorough purification.

Description

Technical Field

[0001] This utility model relates to the field of acid mist purification devices, specifically an acid mist purification device for pickling units. Background Technology

[0002] Pickling of steel strip is a surface treatment process that removes iron oxide scale and impurities from the surface of hot-rolled steel strip using chemical acids, primarily hydrochloric acid, sulfuric acid, or mixed acid solutions. After hot rolling, a dense oxide layer (Fe2O3, Fe3O4, etc.) forms on the surface of the steel strip, affecting the quality of subsequent cold rolling or coating. During pickling, the steel strip, after being uncoiled and straightened, is immersed in a heated acid bath (50-80℃). The acid dissolves the oxide scale, while mechanical descaling or spraying enhances the peeling effect. After treatment, it undergoes multiple stages of rinsing to neutralize residual acid and is dried for rust prevention. This process significantly improves the cleanliness and smoothness of the steel strip surface, providing a good substrate for cold rolling. Acid mist is generated during pickling, and most existing acid mist treatments utilize acid mist purification devices.

[0003] For example, authorization announcement number CN115228253B discloses an acid mist purification system applied to pickling units, relating to the technical field of related equipment in annealing and pickling production lines. This invention, based on the real-time absorption of acid mist generated during the pickling of steel strips, recovers the acid mist, matches it with a suitable alkaline solution, and atomizes the alkaline solution to form alkaline mist. Furthermore, by setting up a swirl spray assembly, a steering assembly, and a drive assembly, the alkaline mist and acid mist are sprayed out in opposite directions, forming a swirling convection reaction layer. This increases the contact area and accelerates the acid-base neutralization reaction. Moreover, by sensing the status information during the reaction process in real time and dynamically processing the information, a dynamic acid mist purification process is achieved, making the purification process more intelligent, more efficient, reducing worker involvement, and protecting the health and safety of workers.

[0004] The above-mentioned technology uses alkaline mist and acid mist to be sprayed out in opposite directions to purify acid mist. However, the amount of alkaline mist and acid mist sprayed out is difficult to control. When the ratio of alkaline mist and acid mist is uneven, the purification is incomplete or alkaline mist is generated. Therefore, the market urgently needs to develop an acid mist purification device for pickling units to help people solve the existing problems. Utility Model Content

[0005] The purpose of this utility model is to provide an acid mist purification device for pickling units, so as to solve the problem mentioned in the background art that the existing technology purifies acid mist by spraying alkaline mist and acid mist in opposite directions, but the amount of alkaline mist and acid mist sprayed is difficult to control, and when the ratio of alkaline mist and acid mist is uneven, it leads to incomplete purification or the generation of alkaline mist.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an acid mist purification device for a pickling unit, comprising a purification box, an exhaust pipe fixedly connected to one side of the upper end face of the purification box, an alkali injection pipe and a drain pipe fixedly connected to the lower ends of the two end faces of the purification box respectively, a dispersion plate fixedly connected to the lower middle part of the interior of the purification box, a plurality of gas dispersion holes arranged in an array on the dispersion plate, a first limiting pipe fixedly connected to the middle of the upper end face of the interior of the purification box, a second limiting pipe fixedly connected to the middle of the dispersion plate, a rotating air guide pipe rotatably connected between the first limiting pipe and the second limiting pipe, the lower end of the rotating air guide pipe extending through the interior of the second limiting pipe and out of the lower end face of the dispersion plate, a drive box fixedly connected to the upper end of the purification box, and an acid mist conveying pipe fixedly connected to the upper end of the drive box.

[0007] Preferably, control valves are fixedly connected to both the alkali injection pipe and the discharge pipe.

[0008] Preferably, the upper end of the rotating air guide tube extends into the drive box after passing through the first limiting tube, and the lower end of the acid mist delivery tube extends into the drive box and is connected to the upper end of the rotating air guide tube through a rotary joint.

[0009] Preferably, a first fixing ring is fixedly connected to the upper end of the dispersion plate on the rotating air guide tube, and a first stirring rod is fixedly connected to the front and rear ends of the first fixing ring. A second fixing ring is fixedly connected to the lower end of the dispersion plate on the rotating air guide tube, and a second stirring rod is fixedly connected to both the front and rear ends of the second fixing ring.

[0010] Preferably, a drive motor is fixedly connected to one side inside the drive box, and a second conical tooth is fixedly connected to the output shaft of the drive motor.

[0011] Preferably, a first conical tooth is fixedly connected to the rotary air guide tube at the lower end of the rotary joint, and the second conical tooth meshes with the tooth portion of the first conical tooth.

[0012] Preferably, an acid-base meter is fixedly installed at the lower middle part of one side end face of the purification box, and a detection head is connected to the lower end of the acid-base meter. The detection head extends through the side end face of the purification box into the interior of the purification box.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) In this utility model, by setting a dual dispersion structure of rotating gas guide tube and dispersion plate, and cooperating with the synchronous rotation of the first stirring rod and the second stirring rod, multi-stage dispersion of acid mist can be achieved, which significantly improves the contact area and reaction efficiency of acid mist and alkaline solution, and ensures more thorough purification.

[0015] (2) In this utility model, the pH value of the alkali solution is monitored in real time by an acid-base meter, which can accurately control the neutralization reaction process, avoid excessive or insufficient alkali solution, ensure the purification effect, reduce alkali solution waste, and realize intelligent control.

[0016] (3) In this utility model, the overall structure is compact and reasonable. The rotating gas pipe is driven by the drive motor to rotate, which simultaneously realizes the dual functions of acid mist dispersion and alkaline liquid stirring. This simplifies the equipment structure, reduces energy consumption and maintenance costs, and has high practicality and economy. Attached Figure Description

[0017] Figure 1 This is a front view of an acid mist purification device for a pickling unit according to the present invention;

[0018] Figure 2 This is a front sectional view of the present invention;

[0019] Figure 3 This is a side sectional view of the present invention;

[0020] Figure 4 This is a detailed enlarged view of part A of this utility model.

[0021] In the diagram: 1. Purification box; 101. Exhaust pipe; 102. Alkali solution filling pipe; 103. Drain pipe; 104. Control valve; 105. First limiting pipe; 2. Dispersion plate; 201. Gas dispersion hole; 202. Second limiting pipe; 3. Rotary gas guide pipe; 301. First fixing ring; 302. First stirring rod; 303. Second fixing ring; 304. Second stirring rod; 305. First conical tooth; 4. Drive box; 401. Drive motor; 402. Second conical tooth; 5. Acid mist conveying pipe; 501. Rotary joint; 6. Acid-base meter; 601. Detection head. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 1-4This utility model provides an embodiment of an acid mist purification device for a pickling unit, comprising a purification chamber 1. An exhaust pipe 101 is fixedly connected to one side of the upper end face of the purification chamber 1. Alkali injection pipes 102 and drain pipes 103 are fixedly connected to the lower ends of both sides of the purification chamber 1, respectively. Control valves 104 are fixedly connected to both the alkali injection pipes 102 and 103, allowing alkali to be injected into the purification chamber 1 through the alkali injection pipes 102. A dispersion plate 2 is fixedly connected to the lower middle part of the interior of the purification chamber 1. Multiple gas dispersion holes 201 are arrayed on the dispersion plate 2. A first limiting pipe 105 is fixedly connected to the middle of the upper end face of the interior of the purification chamber 1. The dispersion plate 2 has a middle section... A second limiting tube 202 is fixedly connected, and a rotating air guide tube 3 is rotatably connected between the first limiting tube 105 and the second limiting tube 202. The lower end of the rotating air guide tube 3 extends through the interior of the second limiting tube 202 and out to the lower end face of the dispersion plate 2. A drive box 4 is fixedly connected to the upper end of the purification box 1, and an acid mist conveying pipe 5 is fixedly connected to the upper end of the drive box 4. The acid mist generated by the pickling unit is conveyed through the acid mist conveying pipe 5 to the lower end of the dispersion plate 2 inside the purification box 1 via the rotating air guide tube 3. The acid mist gas is dispersed through multiple gas dispersion holes 201 on the dispersion plate 2, so that the acid mist and alkali solution can fully contact each other for neutralization and purification. The treated gas is discharged through the exhaust pipe 101.

[0024] Please see Figure 2 and Figure 3 The upper end of the rotating air guide pipe 3 passes through the first limiting pipe 105 and extends into the drive box 4. The lower end of the acid mist conveying pipe 5 extends into the drive box 4 and is connected to the upper end of the rotating air guide pipe 3 through a rotary joint 501, allowing the rotating air guide pipe 3 to rotate through the rotary joint 501. A first fixing ring 301 is fixedly connected to the rotating air guide pipe 3 at the upper end of the dispersion plate 2. A first stirring rod 302 is fixedly connected to the front and rear ends of the first fixing ring 301. A second fixing ring 303 is fixedly connected to the rotating air guide pipe 3 at the lower end of the dispersion plate 2. The two fixed rings 303 are fixedly connected to the front and rear ends of the first stirring rod 302 and the second stirring rod 304. When the rotating air guide tube 3 rotates, it drives the first stirring rod 302 and the second stirring rod 304 to rotate simultaneously. The second stirring rod 304 initially disperses the acid mist entering the lower end of the dispersion plate 2. The initially dispersed acid mist is then dispersed again through the gas dispersion holes 201 on the dispersion plate 2, so that the acid mist is fully dispersed and comes into contact with the alkaline solution. The first stirring rod 302 stirs the alkaline solution at the upper end of the dispersion plate 2, so that the fully dispersed acid mist comes into full contact with the alkaline solution, thereby improving the purification efficiency.

[0025] Please see Figure 4A drive motor 401 is fixedly connected to one side inside the drive box 4. A second conical tooth 402 is fixedly connected to the output shaft of the drive motor 401. A first conical tooth 305 is fixedly connected to the rotating air pipe 3 at the lower end of the rotary joint 501. The second conical tooth 402 meshes with the tooth of the first conical tooth 305. The drive motor 401 drives the rotating air pipe 3 to rotate.

[0026] Please see Figure 2 A pH meter 6 is fixedly installed at the lower middle part of one side end face of the purification box 1. A detection head 601 is connected to the lower end of the pH meter 6. The detection head 601 extends through the side end face of the purification box 1 into the interior of the purification box 1. The pH of the alkaline solution inside the purification box 1 is detected by the pH meter 6 and the detection head 601. When the pH of the alkaline solution tends to be neutral, the acid mist delivery is stopped, and the alkaline solution is discharged through the drain pipe 103 by the control valve 104. The alkaline solution is then refilled through the alkaline solution filling pipe 102.

[0027] Working Principle: In operation, an appropriate amount of alkaline solution is first injected into the purification tank 1 through the alkaline solution injection pipe 102, and the drain pipe 103 is closed through the control valve 104. The acid mist generated by the pickling unit is transported to the rotating air guide pipe 3 via the acid mist conveying pipe 5. The drive motor 401, through the meshing of the second conical tooth 402 and the first conical tooth 305, drives the rotating air guide pipe 3 to rotate, causing the acid mist to be ejected from the lower end of the rotating air guide pipe 3. The rotating second stirring rod 304 initially disperses the ejected acid mist, which is then further dispersed through the gas dispersion holes 201 on the dispersion plate 2, forming fine bubbles. Simultaneously, the rotating first stirring rod 302 agitates the alkaline solution above, promoting full contact and reaction between the acid mist bubbles and the alkaline solution. The acid-base meter 6 monitors the pH value of the alkaline solution in real time through the detection head 601. When the pH value approaches neutral, the system stops the acid mist input, opens the drain pipe 103 to discharge the waste liquid, and refills with fresh alkaline solution, achieving continuous purification operation. The purified gas is discharged through exhaust pipe 101, completing the acid mist neutralization treatment.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An acid mist purification device for a pickling unit, comprising a purification chamber (1), characterized in that: An exhaust pipe (101) is fixedly connected to one side of the upper end face of the purification box (1). An alkaline solution injection pipe (102) and a drain pipe (103) are fixedly connected to the lower ends of the two sides of the purification box (1), respectively. A dispersion plate (2) is fixedly connected to the lower middle part of the interior of the purification box (1). Multiple gas dispersion holes (201) are arranged in an array on the dispersion plate (2). A first limiting pipe (105) is fixedly connected to the middle of the upper end face of the interior of the purification box (1). A second limiting pipe (202) is fixedly connected to the middle of the dispersion plate (2). A rotating gas guide pipe (3) is rotatably connected between the first limiting pipe (105) and the second limiting pipe (202). The lower end of the rotating gas guide pipe (3) extends through the interior of the second limiting pipe (202) and out of the lower end face of the dispersion plate (2). A drive box (4) is fixedly connected to the upper end of the purification box (1). An acid mist conveying pipe (5) is fixedly connected to the upper end of the drive box (4).

2. The acid mist purification device for a pickling unit according to claim 1, characterized in that: Control valves (104) are fixedly connected to both the alkali injection pipe (102) and the discharge pipe (103).

3. The acid mist purification device for a pickling unit according to claim 1, characterized in that: The upper end of the rotating air guide tube (3) passes through the first limiting tube (105) and extends into the drive box (4). The lower end of the acid mist conveying tube (5) extends into the drive box (4) and is connected to the upper end of the rotating air guide tube (3) through a rotary joint (501).

4. The acid mist purification device for a pickling unit according to claim 1, characterized in that: A first fixing ring (301) is fixedly connected to the rotating air guide pipe (3) and the upper end of the dispersion plate (2). A first stirring rod (302) is fixedly connected to the front and rear ends of the first fixing ring (301). A second fixing ring (303) is fixedly connected to the rotating air guide pipe (3) and the lower end of the dispersion plate (2). A second stirring rod (304) is fixedly connected to both the front and rear ends of the second fixing ring (303).

5. The acid mist purification device for a pickling unit according to claim 3, characterized in that: A drive motor (401) is fixedly connected to one side inside the drive box (4), and a second bevel gear (402) is fixedly connected to the output shaft of the drive motor (401).

6. The acid mist purification device for a pickling unit according to claim 5, characterized in that: The rotating air guide tube (3) is fixedly connected to the lower end of the rotating joint (501) with a first conical tooth (305), and the second conical tooth (402) meshes with the tooth of the first conical tooth (305).

7. The acid mist purification device for a pickling unit according to claim 1, characterized in that: An acid-base meter (6) is fixedly installed at the lower middle part of one side end face of the purification box (1). A detection head (601) is connected to the lower end of the acid-base meter (6). The detection head (601) extends through the side end face of the purification box (1) into the interior of the purification box (1).

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