A falling film absorption concentrated hydrochloric acid tail gas recycling equipment and tail gas recycling method

Abstract

This invention relates to the field of industrial exhaust gas recovery and purification equipment, specifically disclosing a falling film absorption concentrated hydrochloric acid exhaust gas recovery device and method. The device includes a housing with tail plates symmetrically fixedly connected to both ends. It also includes a purification mechanism, which is fixedly installed inside the housing. During rotor rotation, the two rotors remain in contact on their closest sides, allowing gas to be transported through the rotors on their furthest sides. The outer tube on the rotor is elastically connected to the mounting column via connecting strips and a strip-shaped bladder, creating a certain displacement difference between the outer tube and the mounting column. This ensures that the outer surface of the outer tube maintains a small gap with the inner wall of the housing, significantly improving the stability of exhaust gas transport. This avoids the problem of traditional exhaust gas recovery methods where the Roots blower rotor is a single unit, preventing effective expansion and contraction and resulting in design gaps that affect the stability of exhaust gas recovery.

Description

Technical Field

[0001] This invention relates to the technical field of industrial exhaust gas recovery and purification equipment, specifically a falling film absorption concentrated hydrochloric acid production exhaust gas recycling equipment and method. Background Technology

[0002] Falling film absorption hydrochloric acid production tail gas recycling equipment refers to a specialized environmental protection device used to collect and treat industrial tail gas containing hydrogen chloride and other components generated during the hydrochloric acid production process through falling film absorption, and to recycle and reuse it. This type of equipment typically uses gas conveying machinery such as Roots blowers as core components, forcibly conveying the tail gas from the absorption system to subsequent treatment units, thus realizing the resource utilization of the tail gas.

[0003] For example, application number "CN201610157118.4" discloses a Roots blower, which features a novel structure with a fusible plug on the outlet side of the blower casing to control the highest temperature inside the casing, thus providing a safety feature. This invention is a Roots blower with a fusible plug, with a relatively simple structure. It is a safety mechanism based on materials and mechanics. The new technology has been proven effective through application, meeting design requirements. However, this type of equipment still suffers from a series of insurmountable technical defects. First, traditional Roots blowers use a fixed gap design between the rotor and the casing, typically reserving a 0.1-0.3mm clearance. While this design can maintain basic sealing performance under constant ambient temperature conditions, the exhaust gas temperature fluctuates drastically during hydrochloric acid production, and the blower typically operates in a discontinuous mode, starting during the day and stopping at night. When the machine is shut down overnight, the casing cools rapidly due to its small size and fast heat dissipation, while the rotor, being larger, cools more slowly, creating a temperature difference of 15-20°C. Because the rotor and casing are made of different materials (rotors are often ductile iron, while casings are cast iron or steel), the difference in their thermal expansion coefficients causes unpredictable and dynamic changes in the fit clearance between them. In severe cases, the rotor may even seize up after the casing cools and contracts, leading to motor overload and burnout or coupling breakage the next day, resulting in a high equipment failure rate. Secondly, traditional integrated rotor structures cannot be radially adjusted. Even under normal operating conditions, a fixed design gap always exists between the rotor and casing. This gap directly leads to a high exhaust gas leakage rate and reduced conveying efficiency. Furthermore, the gap size cannot be dynamically adjusted according to actual operating conditions, failing to meet the sealing requirements under different temperature and pressure conditions. In addition, the tight seal between the two rotors relies mainly on machining precision, lacking an effective elastic compensation mechanism. After long-term wear and tear, the sealing performance between the rotors significantly deteriorates, further exacerbating the exhaust gas leakage problem. Therefore, traditional exhaust gas recycling equipment generally suffers from problems such as poor operational stability, insufficient sealing performance, weak adaptability to thermal cycling conditions, high failure rate, and high maintenance costs, making it difficult to meet the requirements for efficient and stable operation of exhaust gas recovery in hydrochloric acid production. Summary of the Invention

[0004] (a) Technical problems to be solved This invention provides a falling membrane absorption concentrated hydrochloric acid production tail gas recycling device and tail gas recycling method, which solves the problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a falling film absorption device for recycling concentrated hydrochloric acid tail gas, comprising a housing, with tail plates symmetrically and fixedly connected to both ends of the housing, and further comprising a purification mechanism, wherein the purification mechanism is fixedly installed inside the housing; wherein the purification mechanism includes an air inlet, which is fixedly connected to the bottom outer surface of the housing, and an air outlet, which is fixedly connected to the top outer surface of the housing, and a mounting frame is fixedly connected to the outer surface of the tail plate, with a motor fixedly connected to the mounting frame.

[0006] According to one embodiment of the present invention, the output end of the motor is rotatably connected to a drive shaft, the end of the drive shaft away from the motor is rotatably connected to the tail plate, and a rotor is fixedly mounted on the outer surface of the drive shaft.

[0007] According to one embodiment of the present invention, a first gear is fixedly connected to the outer surface of the drive shaft, a second gear meshes with the first gear, a driven shaft is fixedly connected through the second gear, and the driven shaft is rotatably connected through the tail plate, wherein a rotor is also fixedly mounted on the outer surface of the driven shaft.

[0008] According to one embodiment of the present invention, the rotor has a triangular cross-section and is disposed inside the housing, wherein two rotors are arranged in an alternating manner.

[0009] According to one embodiment of the present invention, the rotor includes a mounting post, which is fixedly sleeved on the outer surfaces of the drive shaft and the driven shaft respectively. The cross-section of the mounting post is set to a near-triangular shape. The mounting post is disposed in a housing. A mounting groove is provided diagonally through the mounting post. A strip-shaped bladder is fixedly installed in the mounting groove. The strip-shaped bladder is configured as an elastic bladder. A connecting strip is fixedly connected to the outer surface of the elastic bladder. The connecting strip is slidably connected through the diagonal outer surface of the mounting post. An outer tube is fixedly connected to the outer end of the connecting strip. The outer tube is elastically connected to the mounting post through the connecting strip and the strip-shaped bladder.

[0010] According to one embodiment of the present invention, a sealing strip is fixedly connected to the outer surface of the mounting post. The sealing strip is arranged at three fixed intervals around the central axis of the mounting post. The outer surface of the sealing strip is arc-shaped. The arc of the outer surface of the sealing strip is initially greater than the arc of the outer surface of the outer tube. Rubber strips are fixedly embedded on both outer surfaces of the mounting post. The rubber strips are pressed and adhered to the outer surface of the outer tube.

[0011] According to one embodiment of the present invention, air pressure chambers are symmetrically formed on both sides of the interior of the sealing strip, and a connecting pipe is fixedly connected through the interior of the sealing strip, wherein the three air pressure chambers inside the sealing strip are connected through the connecting pipe.

[0012] According to one embodiment of the present invention, an installation cavity is provided inside the sealing strip on the side near the mounting post. The cross-section of the installation cavity is set as semi-circular. The installation cavity is disposed between two air pressure cavities of the same sealing strip. An elastic plate is fixedly connected inside the installation cavity. The elastic plate is set as arc-shaped. Multiple elastic plates are arranged with the same central axis. A connecting plate is fixedly connected through the elastic plate. The two ends of the connecting plate are fixedly connected to the inner walls of both sides of the installation cavity.

[0013] According to one embodiment of the present invention, a method for recycling tail gas from a falling film absorption concentrated hydrochloric acid production tail gas recycling device includes the following steps: S1, introducing the tail gas to be recycled through the air inlet of the housing and starting the motor; S2, the motor starts and drives the rotor inside the housing to rotate, and as the rotor rotates, it begins to move the tail gas from the air inlet at the bottom of the housing to the air outlet, thus completing the recycling of the tail gas.

[0014] If exhaust gas recovery is required, the exhaust gas can be introduced through the air inlet at the bottom of the device. Then, start the motor. After the motor starts, it will drive the drive shaft to rotate, and through the first and second gears, it will drive the driven shaft to rotate. This will cause the drive shaft to start rotating clockwise and the driven shaft to start rotating counterclockwise. Finally, the two rotors inside the housing will start rotating in opposite directions. At this time, the exhaust gas will start to be introduced through the air inlet and exported through the air outlet at the top of the housing, thus completing the exhaust gas recovery.

[0015] (III) Beneficial Effects This invention provides a device and method for recycling tail gas from a falling film absorption system for producing concentrated hydrochloric acid. It offers the following advantages: (I) The falling film absorption concentrated hydrochloric acid tail gas recycling equipment and method, when the rotors rotate, the two rotors on the side closest to each other always remain in contact, that is, the gas will be transported through the side of the rotors that are far apart from each other. The outer tube on the rotor is elastically connected to the mounting column through the connecting strip and the strip-shaped bladder, that is, there is a certain displacement difference between the outer tube and the mounting column, which ensures that the outer surface of the outer tube always maintains a good micro gap with the inner wall of the shell, thereby greatly improving the stability of the tail gas transportation. This avoids the problem that the Roots blower rotor used in traditional tail gas recovery is an integral structure and cannot effectively expand and contract, resulting in a design gap between it and the shell that affects the stability of tail gas recovery.

[0016] (II) This falling film absorption concentrated hydrochloric acid tail gas recycling equipment and method recovers hydrochloric acid tail gas, which typically experiences significant temperature fluctuations. Conventional Roots blowers often have a pre-designed gap between the rotor and casing for normal operating conditions, typically 0.1-0.3mm. However, in actual production, the blower operates intermittently, often starting during the day and stopping at night. When the casing cools rapidly after shutdown while the rotor cools slowly, the temperature difference can reach 15-20℃. Due to the different materials of the rotor and casing, the difference in their thermal expansion coefficients causes the rotor to seize up after the casing cools and contracts. This can lead to motor overload and burnout or coupling breakage during startup the next day. Even more problematic is that this gap change is dynamic and unpredictable. Traditional fixed gap designs cannot adapt to thermal cycling conditions. The elastic floating contact rotor provided by this equipment perfectly solves this problem while maintaining the required gap, preventing rotor and casing seizure, significantly improving the equipment's operational stability, and extending the motor's lifespan.

[0017] (III) In this falling film absorption concentrated hydrochloric acid tail gas recycling equipment and tail gas recycling method, the curvature of the sealing strip on the outer surface of the mounting column is initially larger than that of the outer surface of the outer tube. That is, when the outer tube of the rotor on the drive shaft contacts the sealing strip of the rotor on the driven shaft, they will squeeze each other. This not only improves the sealing strength between the two rotors, but also compresses the air pressure chambers on both sides of the sealing strip when the outer tubes of the two rotors are squeezed. The air pressure chambers between the three sealing strips on the same rotor are connected by the connecting pipe. That is, when the air pressure chamber on one sealing strip is squeezed, the air pressure on the air pressure chambers of the other two sealing strips will increase and begin to expand, and then begin to squeeze the outer tubes on both sides. This causes the outer tube that rotates to the inner wall of the shell to be squeezed infinitely close to the inner wall of the shell, reducing the distance between the outer tube and the shell. This greatly improves the stability of the tail gas conveying equipment. The sealing strip also has an installation cavity inside, in which arc-shaped stacked elastic plates are installed to provide support for the entire sealing strip, maintain the good deformation performance of the sealing strip, and avoid the problem of the sealing strip deforming rapidly and becoming unstable due to long-term compression by the outer tube. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the motor of the present invention; Figure 3 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 4 This is a schematic diagram of the rotor structure of the present invention; Figure 5 This is a schematic diagram of the mounting column and its connection structure of the present invention; Figure 6 This is a schematic diagram of the connecting pipe of the present invention; Figure 7 This is a schematic diagram of the structure of the strip-shaped capsule of the present invention; Figure 8 This is a cross-sectional structural diagram of the sealing strip of the present invention.

[0019] In the diagram: 1. Shell; 2. Tailplate; 3. Purification mechanism; 31. Air inlet; 32. Air outlet; 33. Mounting bracket; 34. Motor; 35. Drive shaft; 36. Rotor; 37. Gear No. 1; 38. Gear No. 2; 39. Driven shaft; 310. Mounting column; 311. Mounting groove; 312. Strip-shaped bladder; 313. Connecting strip; 314. Outer tube; 315. Sealing strip; 316. Rubber strip; 317. Air pressure chamber; 318. Connecting pipe; 319. Mounting cavity; 320. Elastic plate; 321. Connecting plate. Detailed Implementation

[0020] 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.

[0021] First embodiment: as follows Figures 1 to 8 As shown, the present invention provides a technical solution: a falling film absorption concentrated hydrochloric acid tail gas recycling device, including a shell 1, with tail plates 2 symmetrically fixedly connected to both ends of the shell 1, and further including: Purification mechanism 3 and essence mechanism are fixedly installed inside housing 1; The purification mechanism 3 includes an air inlet 31, which is fixedly connected to the bottom outer surface of the housing 1. An air outlet 32 ​​is fixedly connected to the top outer surface of the housing 1. A mounting bracket 33 is fixedly connected to the outer surface of the tail plate 2, and a motor 34 is fixedly connected to the mounting bracket 33.

[0022] The output end of the motor 34 is rotatably connected to the drive shaft 35. The end of the drive shaft 35 away from the motor 34 is rotatably connected to the tail plate 2. The rotor 36 is fixedly installed on the outer surface of the drive shaft 35.

[0023] A first gear 37 is fixedly connected to the outer surface of the drive shaft 35. A second gear 38 meshes with the first gear 37. A driven shaft 39 is fixedly connected through the second gear 38. The driven shaft 39 is rotatably connected through the tail plate 2. A rotor 36 is also fixedly installed on the outer surface of the driven shaft 39.

[0024] The rotor 36 has a triangular cross-section and is located inside the housing 1, with two rotors 36 arranged in an alternating manner.

[0025] Second embodiment: as follows Figures 1 to 8 As shown, the rotor 36 includes a mounting post 310, which is fixedly sleeved on the outer surfaces of the drive shaft 35 and the driven shaft 39 respectively. The cross-section of the mounting post 310 is set to a near-triangular shape. The mounting post 310 is disposed inside the housing 1. A mounting groove 311 is provided diagonally through the mounting post 310. A strip-shaped bladder 312 is fixedly installed in the mounting groove 311. The strip-shaped bladder 312 is set as an elastic bladder. A connecting strip 313 is fixedly connected to the outer surface of the elastic bladder. The connecting strip 313 is slidably connected through the diagonal outer surface of the mounting post 310. An outer tube 314 is fixedly connected to the outer end of the connecting strip 313. The outer tube 314 is elastically connected to the mounting post 310 through the connecting strip 313 and the strip-shaped bladder 312.

[0026] A sealing strip 315 is fixedly connected to the outer surface of the mounting post 310. The sealing strip 315 is set at three fixed intervals around the central axis of the mounting post 310. The outer surface of the sealing strip 315 is set to be arc-shaped. The arc of the outer surface of the sealing strip 315 is initially greater than the arc of the outer surface of the outer tube 314. Rubber strips 316 are fixedly embedded on both outer surfaces of the mounting post 310. The rubber strips 316 are squeezed and adhered to the outer surface of the outer tube 314.

[0027] The sealing strip 315 has symmetrically arranged air pressure chambers 317 on both sides inside. A connecting pipe 318 is fixedly connected through the inside of the sealing strip 315, and the air pressure chambers 317 inside the three sealing strips 315 are connected through the connecting pipe 318.

[0028] An installation cavity 319 is provided inside the sealing strip 315 on the side near the mounting post 310. The cross-section of the installation cavity 319 is set as semi-circular. The installation cavity 319 is located between two air pressure cavities 317 of the same sealing strip 315. An elastic plate 320 is fixedly connected inside the installation cavity 319. The elastic plate 320 is set as arc. Multiple elastic plates 320 are arranged with the same central axis. A connecting plate 321 is fixedly connected through the elastic plate 320. The two ends of the connecting plate 321 are fixedly connected to the inner walls of the two sides of the installation cavity 319.

[0029] A method for recycling tail gas from a falling film absorption concentrated hydrochloric acid production tail gas recycling device includes the following steps: S1. The exhaust gas to be recovered is introduced into the air inlet 31 of the housing 1 and the motor 34 is started; S2. The motor 34 starts and drives the rotor 36 inside the housing 1 to rotate. As the rotor 36 rotates, it starts to move the exhaust gas from the air inlet 31 at the bottom of the housing 1 to the air outlet 32, thus completing the recovery of the exhaust gas.

[0030] During operation, if exhaust gas recovery is required, the exhaust gas can be introduced through the air inlet 31 at the bottom of the device. Then, the motor 34 is started. After the motor 34 starts, it drives the drive shaft 35 to rotate, which in turn drives the driven shaft 39 to rotate through gears 37 and 38. This causes the drive shaft 35 to rotate clockwise and the driven shaft 39 to rotate counterclockwise, ultimately causing the two rotors 36 inside the housing 1 to rotate in opposite directions. At this time, the exhaust gas is introduced through the air inlet 31 and discharged through the air outlet 32 ​​at the top of the housing 1, completing the exhaust gas recovery. When the rotors 36 rotate, the sides of the two rotors 36 that are close to each other remain in contact, meaning that the gas is transported through the sides of the rotors 36 that are far apart. The outer tube 314 and the mounting column 310 are elastically connected by a connecting strip 313 and a strip-shaped bladder 312. That is, there is a certain displacement difference between the outer tube 314 and the mounting column 310, ensuring that the outer surface of the outer tube 314 always maintains a good micro-gap with the inner wall of the shell 1. This greatly improves the stability of the conveyed exhaust gas and avoids the problem that the rotor 36 of the Roots blower used in traditional exhaust gas recovery is an integral structure and cannot effectively expand and contract, resulting in a design gap between it and the shell 1 that affects the stability of exhaust gas recovery. At the same time, this equipment recovers hydrochloric acid exhaust gas, and the temperature fluctuation of hydrochloric acid exhaust gas is usually quite drastic. The rotor 36 of the conventional Roots blower and the shell 1 are often designed with a gap reserved for normal temperature conditions, and the gap is usually 0.1-0.The fan is 3mm thick, but in actual production, the fan operates intermittently. Typically, it starts during the day and stops at night. When the casing 1 cools rapidly after shutdown while the rotor 36 cools down more slowly, the temperature difference can reach 15-20℃. Because the rotor 36 and casing 1 are made of different materials, the rotor 36 is often ductile iron, while the casing 1 is cast iron or steel. This difference in thermal expansion coefficients causes the rotor 36 to seize up after the casing 1 cools and contracts. The next day, when starting up, the motor 34 is overloaded and burns out, or the coupling breaks. Even more problematic is that this gap change is dynamic and unpredictable. Traditional... Fixed gap designs cannot adapt to thermal cycling conditions. The elastic floating contact rotor 36 provided by this equipment perfectly solves this problem while ensuring the gap, preventing the rotor 36 from seizing with the housing 1, significantly improving the operational stability of the equipment, and extending the service life of the motor 34. Initially, the curvature of the sealing strip 315 on the outer surface of the mounting column 310 is larger than that of the outer surface of the outer tube 314. This means that when the outer tube 314 of the rotor 36 on the drive shaft 35 contacts the sealing strip 315 of the rotor 36 on the driven shaft 39, a phase contact will occur. The mutual compression not only improves the sealing strength between the two rotors 36, but also, when the outer tube 314 between the two rotors 36 is compressed against the sealing strip 315, the air pressure chambers 317 on both sides of the sealing strip 315 are compressed. Since the air pressure chambers 317 of the three sealing strips 315 on the same rotor 36 are connected by the connecting pipe 318, when the air pressure chamber 317 on one sealing strip 315 is compressed, the air pressure in the air pressure chambers 317 on the other two sealing strips 315 increases, causing them to expand and subsequently compress the outer tubes 314 on both sides. The outer tube 314, rotated to one side of the inner wall of the housing 1, is compressed infinitely close to the inner wall of the housing 1, reducing the distance between the outer tube 314 and the housing 1. This significantly improves the stability of the exhaust gas delivery in this equipment. Furthermore, the sealing strip 315 has an internal mounting cavity 319, within which are installed arc-shaped stacked elastic plates 320. This provides support for the entire sealing strip 315, maintaining its good deformation performance and preventing the sealing strip 315 from rapidly deforming and becoming unstable due to prolonged compression by the outer tube 314.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for recycling tail gas from a falling film absorption system for producing concentrated hydrochloric acid, comprising a shell (1), characterized in that: The shell (1) is symmetrically fixedly connected to tail plates (2) at both ends, and also includes: Purification mechanism (3), wherein the essence mechanism is fixedly installed inside the housing (1); The purification mechanism (3) includes an air inlet (31), which is fixedly connected to the bottom outer surface of the housing (1). An air outlet (32) is fixedly connected to the top outer surface of the housing (1). A mounting bracket (33) is fixedly connected to the outer surface of the tail plate (2). A motor (34) is fixedly connected to the mounting bracket (33).

2. The device for recycling tail gas from falling film absorption to produce concentrated hydrochloric acid according to claim 1, characterized in that: The output end of the motor (34) is rotatably connected to a drive shaft (35), and the end of the drive shaft (35) away from the motor (34) is rotatably connected to the tail plate (2). A rotor (36) is fixedly installed on the outer surface of the drive shaft (35).

3. The device for recycling tail gas from falling film absorption to produce concentrated hydrochloric acid according to claim 2, characterized in that: A first gear (37) is fixedly connected to the outer surface of the drive shaft (35). A second gear (38) meshes with the first gear (37). A driven shaft (39) is fixedly connected through the second gear (38). The driven shaft (39) is rotatably connected through the tail plate (2). A rotor (36) is also fixedly installed on the outer surface of the driven shaft (39).

4. The device for recycling tail gas from falling film absorption to produce concentrated hydrochloric acid according to claim 3, characterized in that: The rotor (36) has a triangular cross section and is located inside the housing (1), wherein two rotors (36) are arranged in an alternating manner.

5. The device for recycling tail gas from falling film absorption to produce concentrated hydrochloric acid according to claim 4, characterized in that: The rotor (36) includes a mounting post (310), which is fixedly sleeved on the outer surfaces of the drive shaft (35) and the driven shaft (39). The cross-section of the mounting post (310) is set to a near-triangular shape. The mounting post (310) is set inside the housing (1). A mounting groove (311) is opened diagonally through the mounting post (310). A strip-shaped bladder (312) is fixedly installed in the mounting groove (311). The strip-shaped bladder (312) is set as an elastic bladder. A connecting strip (313) is fixedly connected to the outer surface of the elastic bladder. The connecting strip (313) is slidably connected through the diagonal outer surface of the mounting post (310). An outer tube (314) is fixedly connected to the outer end of the connecting strip (313). The outer tube (314) is elastically connected to the mounting post (310) through the connecting strip (313) and the strip-shaped bladder (312).

6. The device for recycling tail gas from falling film absorption to produce concentrated hydrochloric acid according to claim 5, characterized in that: A sealing strip (315) is fixedly connected to the outer surface of the mounting post (310). The sealing strip (315) is arranged in three fixed intervals around the central axis of the mounting post (310). The outer surface of the sealing strip (315) is arc-shaped. The arc of the outer surface of the sealing strip (315) is initially greater than the arc of the outer surface of the outer tube (314). Rubber strips (316) are fixedly embedded on both outer surfaces of the mounting post (310). The rubber strips (316) are pressed and adhered to the outer surface of the outer tube (314).

7. The device for recycling tail gas from falling film absorption to produce concentrated hydrochloric acid according to claim 6, characterized in that: The sealing strip (315) has symmetrically arranged air pressure chambers (317) on both sides inside. The sealing strip (315) is connected by a connecting pipe (318) through it. The three air pressure chambers (317) inside the sealing strip (315) are connected by the connecting pipe (318).

8. The device for recycling tail gas from falling film absorption to produce concentrated hydrochloric acid according to claim 7, characterized in that: The sealing strip (315) has an installation cavity (319) on the side near the mounting post (310). The cross-section of the installation cavity (319) is set as semi-circular. The installation cavity (319) is set between two air pressure chambers (317) of the same sealing strip (315). An elastic plate (320) is fixedly connected inside the installation cavity (319). The elastic plate (320) is set as arc. Multiple elastic plates (320) are arranged with the same central axis. A connecting plate (321) is fixedly connected through the elastic plate (320). The two ends of the connecting plate (321) are fixedly connected to the inner walls of both sides of the installation cavity (319).

9. A method for recycling tail gas from a falling film absorption concentrated hydrochloric acid production tail gas recycling device, using the device described in claim 1, characterized in that: Includes the following steps: S1. The exhaust gas to be recovered is introduced from the air inlet (31) of the housing (1) and the motor (34) is started. S2. The motor (34) starts and drives the rotor (36) inside the housing (1) to rotate. As the rotor (36) rotates, it starts to drive the exhaust gas from the air inlet (31) at the bottom of the housing (1) to the air outlet (32) to complete the recovery of exhaust gas.

Images