Desulfurizing absorption tower with corrosion-resistant bottom layer

Abstract

The invention relates to the technical field of waste gas treatment, in particular to a desulfurizing absorption tower with a corrosion-resistant bottom layer, the desulfurizing absorption tower comprises a tower body shell and a smoke inlet pipe, the smoke inlet pipe comprises a front-section pipe, a middle-section pipe and a tail-section pipe which are sequentially communicated, and the middle-section pipe spirally extends downwards in the tower body shell; the inner spiral position of the middle section pipe is communicated with a calandria; the inner bottom of the middle section pipe is sunken outwards to form a collecting groove; the bottom of the collecting tank is rotationally connected with a plurality of special-shaped plates through a first rotating shaft arranged on a connecting part, and the axis of the first rotating shaft is parallel to the width direction of the collecting tank; each special-shaped plate is correspondingly provided with a supporting shaft which is used for supporting the special-shaped plate from the bottom; the exhaust end of the exhaust pipe faces the tail end of the special-shaped plate, so that the tail end of the special-shaped plate moves upwards to impact the collecting tank under the action of airflow. The corrosion speed of the bottom layer of the desulfurization absorption tower can be obviously slowed down, and the service life of the desulfurization absorption tower is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and specifically to a desulfurization absorption tower with bottom anti-corrosion. Background Art

[0002] The desulfurization absorption tower is the core equipment of the industrial flue gas desulfurization system, which is used to remove sulfur dioxide in the flue gas and reduce air pollution. The desulfurization absorption tower mainly uses alkaline absorbents (such as limestone slurry, sodium hydroxide solution, etc.) to react with SO2 to generate stable salts (such as calcium sulfate, calcium sulfite, etc.), so as to achieve the purpose of desulfurization.

[0003] The desulfurization absorption tower introduces external flue gas into the inner bottom layer of the tower body through the flue gas inlet pipe. After that, the flue gas gradually rises and contacts with the alkaline absorbent. However, the current desulfurization absorption tower does not homogenize the introduced flue gas, resulting in the flue gas directly rushing into the desulfurization absorption tower at a relatively fast speed. On the one hand, particulate solid substances such as dust in the flue gas have a strong scouring effect on the inner wall of the desulfurization absorption tower and internal components (such as nozzles, demisters, tower walls, etc.) under high-speed flow. Continuous scouring will wear the anti-corrosion coating on the inner wall of the desulfurization absorption tower or the metal surface, causing fresh metal to be exposed in the corrosive environment and accelerating the corrosion process; on the other hand, the high-speed flue gas forms turbulence and eddy currents in the tower, resulting in too high flow velocity in local areas, forming a high shear force environment, which intensifies the mechanical wear of the equipment. Turbulence may cause corrosive media (such as sulfuric acid, sulfurous acid, etc.) to accumulate in local areas, forming a high-concentration corrosion environment and accelerating electrochemical corrosion, which has an adverse impact on the service life of the desulfurization tower. Summary of the Invention

[0004] The purpose of the present invention is to provide a desulfurization absorption tower with bottom anti-corrosion to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A desulfurization absorption tower with bottom anti-corrosion, including a tower body shell and a flue gas inlet pipe. The flue gas inlet pipe includes a front section pipe, a middle section pipe, and a tail section pipe that are connected in sequence. Among them, the middle section pipe spirally extends downward inside the tower body shell; A discharge pipe is connected to the inner spiral position of the middle section pipe; The inner bottom of the middle section pipe is recessed outward to form a collection tank; A plurality of special-shaped plates are rotatably connected to the bottom of the collection tank through a first rotating shaft provided on a connecting member. The axis of the first rotating shaft is parallel to the groove width direction of the collection tank; Each special-shaped plate is correspondingly provided with a support shaft for lifting the special-shaped plate from the bottom; The exhaust end of the discharge pipe faces the tail end of the special-shaped plate, so that the tail end of the special-shaped plate moves upward under the action of air flow and impacts the collection tank.

[0006] Preferably, the special-shaped plate includes a first plate body and a second plate body fixedly connected through a second arc transition part. The airflow discharged from the exhaust pipe impacts the second plate body and the second arc transition part, causing the special-shaped plate to move upward and impact the collection tank.

[0007] Preferably, a swing block is correspondingly arranged for each special-shaped plate, and the bottom of the swing block is V-shaped; The swing block is rotatably connected to the collection tank through a third rotating shaft; One end of the first plate body far from the second arc transition part is rotatably connected to the first rotating shaft through a second rotating shaft; The axis of the second rotating shaft and the axis of the third rotating shaft are both perpendicular to the axis of the first rotating shaft; When the swing block naturally hangs down, the ridge line at its bottom end, the central dividing line of the special-shaped plate, the axis of the third rotating shaft, and the axis of the second rotating shaft are all located in the same vertical plane; The support shaft is arranged on the side of the second rotating shaft close to the swing block.

[0008] Preferably, two support protrusions are arranged at the top of the support shaft, and the two support protrusions are symmetrically distributed on both sides of the central dividing line of the special-shaped plate.

[0009] Preferably, the support shaft is fixedly connected to the collection tank through a connecting plate.

[0010] Preferably, the connecting component further includes first fixing seats rotatably connected to both ends of the first rotating shaft, and the first fixing seats are fixedly connected to the collection tank; The first rotating shaft is fixedly connected with a second fixing seat through a first connecting block. One end of the second rotating shaft is rotatably connected to the second fixing seat, and the other end of the second rotating shaft is fixedly connected to the first plate body through a protruding seat.

[0011] Preferably, the top of the swing block is fixedly connected to the third rotating shaft through a second connecting block, and third fixing seats are rotatably connected to both ends of the third rotating shaft, and the third fixing seats are fixedly connected to the collection tank.

[0012] Preferably, the exhaust pipe includes a vertical pipe section, a longitudinal pipe section, and a transverse pipe section that are sequentially connected in communication; the top end of the vertical pipe section is connected in communication with the middle pipe section.

[0013] Preferably, the collection tank includes two first inclined walls arranged in a positive V shape, two second inclined walls arranged in an inverted V shape, a bottom wall of the tank, and vertical walls connected between the second inclined walls and the bottom wall of the tank. The first inclined walls and the second inclined walls are connected through a first arc transition part.

[0014] Preferably, the tail section pipe extends obliquely downward to the outside of the tower body shell and is connected with a sealing plug; The end of the tail section pipe located outside the tower body shell is provided with an external screw pipe, and the sealing plug includes a receiving barrel and an internal screw sleeve adapted to the external screw pipe.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, the flue gas itself and particulate matters such as dust in the flue gas will contact and rub against the outer spiral wall of the middle section pipe due to centrifugal force, thereby reducing the speed. On the one hand, this can reduce the flow rate of the flue gas, and on the other hand, it can also remove some particulate matters in the flue gas, thus significantly slowing down the corrosion rate of the bottom layer of the absorption tower and extending the service life of the desulfurization absorption tower; multiple exhaust pipes are provided to evenly discharge the flue gas into the interior of the desulfurization absorption tower, which is more conducive to the reaction between the flue gas and the alkaline absorbent; further, the continuous up and down movement of the second plate body will further change the flow direction and flow rate of the flue gas discharged through the exhaust pipes. Coupled with the fact that the second plate body itself can rotate under the action of impact force, the flue gas can be more evenly diffused into the tower body, improving the reaction efficiency between the flue gas and the alkaline absorbent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic cross-sectional structure diagram of the middle section pipe of the present invention; Figure 3 for the present invention Figure 2 is an enlarged schematic structural diagram at A in Figure 4 is a schematic structural diagram of the swing block swinging to the left in the present invention; Figure 5 is a schematic structural diagram of the swing block swinging to the right in the present invention; Figure 6 is a top view structural diagram of the exhaust pipe of the present invention; Figure 7 is a side view structural diagram of the special-shaped plate and the swing block of the present invention; Figure 8 is a schematic structural diagram of the support protrusion of the present invention; Figure 9 is a cross-sectional structural diagram of the sealing plug of the present invention.

[0017] In the figure: 1. Tower body shell; 2. Smoke inlet pipe; 21. Front section pipe; 22. Middle section pipe; 23. Tail section pipe; 231. External screw pipe; 24. Sealing plug; 241. Storage barrel; 242. Internal screw sleeve; 25. Drain pipe; 251. Vertical pipe section; 252. Longitudinal pipe section; 253. Transverse pipe section; 26. Collection tank; 261. First inclined wall; 262. Second inclined wall; 263. Vertical wall; 264. Bottom wall of the tank; 265. First arc transition part; 3. Special-shaped plate; 31. First plate body; 32. Second plate body; 33. Second arc transition part; 34. Connecting component; 341. First fixing seat; 342. First rotating shaft; 343. First connecting block; 344. Second fixing seat; 345. Second rotating shaft; 346. Protruding seat; 35. Support shaft; 351. Connecting plate; 352. Support protrusion; 4. Swing block; 41. Ridge line; 42. Second connecting block; 43. Third rotating shaft; 44. Third fixing seat. Specific embodiments

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1-9 , the present invention provides a technical solution: A desulfurization absorption tower with bottom anti-corrosion includes a tower body shell 1 and a smoke inlet pipe 2. The smoke inlet pipe 2 is used to introduce external flue gas into the inner bottom layer position of the tower body shell 1. However, in the technical solution of the present invention, the structure of the smoke inlet pipe 2 is different from that of the existing smoke inlet pipe. Specifically, in this technical solution, the smoke inlet pipe 2 is made of corrosion-resistant material, and the smoke inlet pipe 2 includes a front section pipe 21, a middle section pipe 22, and a tail section pipe 23 that are connected in sequence. Among them, the front section pipe 21 is a straight pipe, which is inserted into the interior of the tower body shell 1 along the tangent direction of the tower body shell 1; the middle section pipe 22 has a spiral-down structure, and the middle section pipe 22 spirals downward inside the tower body shell 1; the tail section pipe 23 is inclined. Specifically, the tail section pipe 23 extends obliquely downward to the outside of the tower body shell 1 and is connected with a sealing plug 24; an external screw pipe 231 is provided at the end of the tail section pipe 23 located outside the tower body shell 1, and the sealing plug 24 includes a storage barrel 241 and an internal screw sleeve 242 adapted to the external screw pipe 231; the cooperation between the external screw pipe 231 and the internal screw sleeve 242 can realize the threaded connection between the storage barrel 241 and the tail section pipe 23, which facilitates the installation and disassembly of the storage barrel 241. Its function is that the storage barrel 241 is used to store impurities such as particulate matter in the flue gas, and the internal collected impurities can be removed by removing the storage barrel 241.

[0020] A drain pipe 25 is connected to the inner spiral position of the middle section pipe 22. Herein, the inner spiral position of the middle section pipe 22 refers to the inner spiral wall of the middle section pipe 22. The middle section pipe 22 also has an outer spiral wall relative to the inner spiral wall. During actual use, the flue gas directly enters the interior of the middle section pipe 22 from the front section pipe 21 and flows along the spiral direction of the middle section pipe 22. During this process, the flue gas itself and particulate matters such as dust in the flue gas will contact and rub against the outer spiral wall of the middle section pipe 22 due to centrifugal force, thereby reducing the speed. In this way, on the one hand, the flow rate of the flue gas can be reduced, and on the other hand, part of the particulate matters in the flue gas can be removed, so that the corrosion rate of the bottom layer of the absorption tower can be significantly slowed down, and the service life of the desulfurization absorption tower can be extended; A plurality of drain pipes 25 are provided for evenly discharging the flue gas into the interior of the desulfurization absorption tower, which is more conducive to the reaction between the flue gas and the alkaline absorbent.

[0021] The drain pipe 25 includes a vertical pipe section 251, a longitudinal pipe section 252, and a transverse pipe section 253 that are connected in sequence; the top end of the vertical pipe section 251 is connected to the middle section pipe 22.

[0022] A collection groove 26 is formed by the inner bottom of the middle section pipe 22 being recessed outward; the collection groove 26 is used to collect particulate matters in the flue gas. Since the middle section pipe 22 spirally extends downward inside the tower shell 1, the particulate matters will ultimately enter the interior of the storage barrel 241 through the tail section pipe 23; Specifically, the collection groove 26 includes two first inclined walls 261 arranged in a positive V shape, two second inclined walls 262 arranged in an inverted V shape, a groove bottom wall 264, and a vertical wall 263 connecting the second inclined wall 262 and the groove bottom wall 264. The first inclined wall 261 and the second inclined wall 262 are connected by a first arc transition part 265; on the one hand, the first inclined wall 261 arranged in a positive V shape and the second inclined wall 262 arranged in an inverted V shape can make the notch of the collection groove 26 in a constricted shape, for example, to facilitate the entry of particulate matters, and also has the function of preventing the particulate matters inside the collection groove 26 from re-entering the interior of the middle section pipe 22; on the other hand, the constricted notch also has a certain elastic squeezing performance, so that when the special-shaped plate 3 below impacts the groove bottom wall 264, the entire collection groove 26 can vibrate more greatly, which is more conducive to the particulate matters rolling into the tail section pipe 23.

[0023] Furthermore, several special-shaped plates 3 are rotatably connected to the bottom of the collection tank 26 through a first rotating shaft 342 provided on the connecting member 34. The several special-shaped plates 3 are arranged at equal intervals along the spiral direction of the middle section pipe 22. The axis of the first rotating shaft 342 is parallel to the width direction of the collection tank 26. Each special-shaped plate 3 is correspondingly provided with a support shaft 35 for supporting the special-shaped plate 3 from the bottom, so that the special-shaped plate 3 can maintain a predetermined inclination angle when stationary. Two support protrusions 352 are provided at the top of the support shaft 35, and the two support protrusions 352 are symmetrically distributed on both sides of the bisecting line of the special-shaped plate 3. The support protrusions 352 are used to increase the distance between the support shaft 35 and the special-shaped plate 3. The support shaft 35 is fixedly connected to the collection tank 26 through a connecting plate 351. The exhaust end of the exhaust pipe 25 faces the tail end of the special-shaped plate 3, so that the tail end of the special-shaped plate 3 moves upward under the action of the airflow and impacts the collection tank 26.

[0024] Specifically, the special-shaped plate 3 includes a first plate body 31 and a second plate body 32 fixedly connected through a second arc transition portion 33. The airflow discharged from the exhaust pipe 25 impacts the second plate body 32 and the second arc transition portion 33, causing the special-shaped plate 3 to move upward and impact the collection tank 26.

[0025] The working principle of the above technical solution is as follows: The flue gas enters multiple exhaust pipes 25 through the middle section pipe 22. Since the exhaust pipes 25 are connected to the inner spiral wall of the middle section pipe 22, only a small number of particles with smaller particle sizes can enter the tower body together with the exhaust pipes 25. Most of the particles will impact on the outer spiral wall of the middle section pipe 22 and finally roll into the interior of the collection tank 26. And because the number of exhaust pipes 25 is large, the flue gas can be evenly and slowly discharged into the tower body to achieve the purpose of anti-corrosion. Moreover, the flue gas discharged from the exhaust pipes 25 will directly blow onto the second plate body 32 and the second arc transition portion 33, so that the second plate body 32 can be driven to move upward by the action of the airflow and finally impact the bottom wall 264 of the collection tank 26, causing the collection tank 26 to generate a certain vibration, promoting the rolling of the particles inside the collection tank 26, and enabling the particles to roll into the interior of the storage barrel 241 as soon as possible. At the same time, on the one hand, the continuous up and down movement of the second plate body 32 will further change the flow direction and flow rate of the flue gas discharged through the exhaust pipes 25. Specifically, when the second plate body 32 descends, the flue gas discharged from the exhaust pipes 25 will be guided by the second plate body 32 and flow obliquely downward, changing its flow direction and also reducing its flow rate. And when the second plate body 32 rises to the highest position, the flue gas discharged from the exhaust pipes 25 will not be guided by the second plate body 32 and will be directly blown out. This is beneficial for the flue gas to slowly diffuse into the entire tower body to avoid excessive local flue gas concentration.

[0026] To further change the flow direction of the flue gas discharged from the exhaust pipe 25, in this embodiment, a swing block 4 is correspondingly arranged for each special-shaped plate 3. The bottom of the swing block 4 is V-shaped and is made of stainless steel as a whole. The swing block 4 is rotatably connected to the collection tank 26 through a third rotating shaft 43. One end of the first plate body 31 away from the second arc transition part 33 is rotatably connected to the first rotating shaft 342 through a second rotating shaft 345. The axis of the second rotating shaft 345 and the axis of the third rotating shaft 43 are both perpendicular to the axis of the first rotating shaft 342. When the swing block 4 hangs naturally, the ridge line 41 at its bottom end, the center line of the special-shaped plate 3, the axis of the third rotating shaft 43, and the axis of the second rotating shaft 345 are all located in the same vertical plane. The support shaft 35 is arranged on the side of the second rotating shaft 345 close to the swing block 4.

[0027] The working principle of the swing block 4 is as follows: Since the swing block 4 is rotatably connected to the collection tank 26 through the third rotating shaft 43, the swing block 4 can rotate around the third rotating shaft 43. When the special-shaped plate 3 impacts the ridge line 41 at the bottom end of the swing block 4, the impact force may push the swing block 4 to rotate around the third rotating shaft 43 by a certain angle. As Figure 4 and Figure 5 shown, when the special-shaped plate 3 impacts the swing block 4 that swings to the left, the special-shaped plate 3 itself will rotate to the right around the second rotating shaft 345. At this time, as the special-shaped plate 3 falls back, the flue gas discharged from the exhaust pipe 25 will be guided by the second plate body 32 that rotates to the right and change the flow direction. Similarly, when the special-shaped plate 3 impacts the swing block 4 that swings to the right, the flue gas discharged from the exhaust pipe 25 will be guided by the second plate body 32 that rotates to the left and change the flow direction. That is to say, the special-shaped plate 3 can randomly guide the flow direction of the flue gas discharged from the exhaust pipe 25, which is beneficial to the uniform distribution of the flue gas in the tower body and improves the reaction efficiency of the flue gas with the alkaline absorbent.

[0028] The connecting component 34 further includes a first fixing seat 341 rotatably connected to both ends of the first rotating shaft 342. The first fixing seat 341 is fixedly connected to the collection tank 26. The first rotating shaft 342 is fixedly connected with a second fixing seat 344 through a first connecting block 343. One end of the second rotating shaft 345 is rotatably connected to the second fixing seat 344, and the other end of the second rotating shaft 345 is fixedly connected to the first plate body 31 through a protruding seat 346.

[0029] The top of the swing block 4 is fixedly connected to the third rotating shaft 43 through a second connecting block 42. Both ends of the third rotating shaft 43 are rotatably connected with a third fixing seat 44, and the third fixing seat 44 is fixedly connected to the collection tank 26.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A desulfurization absorption tower with bottom anti-corrosion, comprising a tower body shell (1) and a flue gas inlet pipe (2), characterized in that, The smoke inlet pipe (2) includes a front section pipe (21), a middle section pipe (22), and a tail section pipe (23) that are connected in sequence. Among them, the middle section pipe (22) spirally extends downward inside the tower shell (1). A discharge pipe (25) is connected to the inner spiral position of the middle section pipe (22). The inner bottom of the middle section pipe (22) is recessed outward to form a collection groove (26). A plurality of special-shaped plates (3) are rotatably connected to the bottom of the collection groove (26) through a first rotating shaft (342) provided on a connecting member (34). The axis of the first rotating shaft (342) is parallel to the groove width direction of the collection groove (26). A support shaft (35) is correspondingly provided for each special-shaped plate (3) to support the special-shaped plate (3) from the bottom. The exhaust end of the discharge pipe (25) faces the tail end of the special-shaped plate (3), so that the tail end of the special-shaped plate (3) moves upward under the action of the airflow and impacts the collection groove (26).

2. The desulfurization absorption tower with bottom anti-corrosion according to claim 1, characterized in that, The special-shaped plate (3) includes a first plate body (31) and a second plate body (32) fixedly connected through a second arc transition part (33). The airflow discharged from the discharge pipe (25) impacts the second plate body (32) and the second arc transition part (33), causing the special-shaped plate (3) to move upward and impact the collection groove (26).

3. The desulfurization absorption tower with bottom anti-corrosion according to claim 2, characterized in that, A swing block (4) is correspondingly provided for each special-shaped plate (3), and the bottom of the swing block (4) is V-shaped. The swing block (4) is rotatably connected to the collection groove (26) through a third rotating shaft (43). One end of the first plate body (31) far from the second arc transition part (33) is rotatably connected to the first rotating shaft (342) through a second rotating shaft (345). The axes of the second rotating shaft (345) and the third rotating shaft (43) are both perpendicular to the axis of the first rotating shaft (342). When the swing block (4) hangs naturally, the ridge line (41) at its bottom end, the center line of the special-shaped plate (3), the axis of the third rotating shaft (43), and the axis of the second rotating shaft (345) are all located in the same vertical plane. The support shaft (35) is arranged on the side of the second rotating shaft (345) close to the swing block (4).

4. A desulfurization absorption tower with bottom anti-corrosion according to claim 3, characterized in that, Two support protrusions (352) are provided at the top of the support shaft (35), and the two support protrusions (352) are symmetrically distributed on both sides of the center line of the special-shaped plate (3).

5. A desulfurization absorption tower with bottom anti-corrosion according to claim 1, characterized in that, The support shaft (35) is fixedly connected to the collection groove (26) through a connecting plate (351).

6. The desulfurization absorption tower with bottom layer anti-corrosion according to claim 3, characterized in that, The connecting member (34) further includes first fixed seats (341) rotatably connected to both ends of the first rotating shaft (342), and the first fixed seats (341) are fixedly connected to the collection groove (26). The first rotating shaft (342) is fixedly connected to a second fixed seat (344) through a first connecting block (343). One end of the second rotating shaft (345) is rotatably connected to the second fixed seat (344), and the other end of the second rotating shaft (345) is fixedly connected to the first plate body (31) through a protruding seat (346).

7. The desulfurization absorption tower with bottom anti-corrosion according to claim 3, characterized in that The top of the swing block (4) is fixedly connected to the third rotating shaft (43) through a second connecting block (42), and both ends of the third rotating shaft (43) are rotatably connected to third fixed seats (44), and the third fixed seats (44) are fixedly connected to the collection groove (26).

8. A desulfurization absorption tower with bottom anti-corrosion according to claim 1, characterized in that The pipe row (25) includes a vertical pipe section (251), a longitudinal pipe section (252), and a transverse pipe section (253) that are connected in sequence; the top end of the vertical pipe section (251) is connected to the middle section pipe (22).

9. A desulfurization absorption tower with bottom anti-corrosion according to claim 1, characterized in that, The collection tank (26) includes two first inclined walls (261) arranged in a positive V shape, two second inclined walls (262) arranged in an inverted V shape, a bottom wall (264), and a vertical wall (263) connected between the second inclined wall (262) and the bottom wall (264). The first inclined wall (261) and the second inclined wall (262) are connected by a first arc transition portion (265).

10. A desulfurization absorption tower with bottom anti-corrosion according to claim 1, characterized in that, The tail section pipe (23) extends obliquely downward to the outside of the tower shell (1) and is connected with a sealing plug (24); An external screw pipe (231) is arranged at the end of the tail section pipe (23) located outside the tower shell (1). The sealing plug (24) includes a receiving barrel (241) and an internal screw sleeve (242) adapted to the external screw pipe (231).

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