Dust-containing exhaust gas treatment apparatus

Abstract

The application discloses a dust-containing waste gas treatment equipment and belongs to the technical field of environmental protection and dust removal. The dust-containing waste gas treatment equipment comprises a first-stage dust removal chamber, a second-stage dust removal chamber and a third-stage dust removal chamber arranged from top to bottom, a return air duct is externally connected with an air extraction fan at the top of the return air duct, the return air duct passes through the three dust removal chambers from top to bottom, the lower end of the return air duct is located in the third-stage dust removal chamber, a water seal structure is arranged between the adjacent two dust removal chambers and at the bottom of the third-stage dust removal chamber, and a three-stage dust removal structure is formed in the three dust removal chambers. Through vertical integration of the three-stage centrifugal water film, the application realizes three-stage efficient dust removal in a limited volume through layer-by-layer nesting, and greatly improves the dust removal efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of dust-containing waste gas treatment equipment, and specifically to dust-containing waste gas treatment equipment. Background Technology

[0002] Centrifugal dust-laden exhaust gas treatment equipment is a classic wet scrubber. Its working process can be broken down into the following key steps: Water flows out from the overflow tank or annular nozzle at the top of the equipment and forms a continuous water film that flows evenly from top to bottom along the inner wall of the vertical cylinder. Dust-laden exhaust gas enters at high speed from the bottom of the cylinder in a tangential direction. This tangential airflow is forced to rotate and rise along a spiral trajectory inside the cylinder (spiral flow against the current). During high-speed rotation, dust particles in the exhaust gas are thrown against the cylinder wall by centrifugal force. After the dust collides with the water film on the inner wall, it is wetted, adsorbed, and carried away by the water flow. The purified exhaust gas is discharged from the top, while the wastewater that has adsorbed the dust flows along the wall to the bottom cone and is discharged through the dust outlet. Its core lies in using the synergistic effect of centrifugal force and water film to capture dust.

[0003] Despite their simple and reliable structure, centrifugal dust-laden exhaust gas treatment equipment still faces some challenges. For example, after the exhaust gas enters the cylinder, its airflow velocity decreases, and the centrifugal force weakens, leading to a significant drop in dust removal efficiency and insufficient collection efficiency for fine dust, resulting in a small amount of dust particles still remaining in the exhaust gas after dust removal. Another example is the "water carryover" problem: this is one of the most common problems. The reason is that when the flue gas rotates at high speed, it may entrain some water film, forming "white smoke" containing water in the exhaust gas, which leads to ash accumulation and corrosion in downstream fans and flues, increasing maintenance costs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a dust-laden waste gas treatment device. The core innovation is the use of a three-stage centrifugal water film for continuous dust removal in three stages. The purpose of this three-stage dust removal design is to improve the dust removal effect, resulting in a compact structure and reduced equipment size.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows:

[0006] A dust-laden exhaust gas treatment device includes a first-stage dust removal chamber, a second-stage dust removal chamber, and a third-stage dust removal chamber arranged from top to bottom. An exhaust fan is connected to the top of a return air duct, and the return air duct passes through the three dust removal chambers from top to bottom, with its lower end located inside the third-stage dust removal chamber. A water seal structure is provided between two adjacent dust removal chambers and at the bottom of the third-stage dust removal chamber. The device is characterized in that a first-stage water distribution pipe and an air inlet pipe are provided inside the first-stage dust removal chamber. The first-stage water distribution pipe is connected to a high-pressure water source and sprays water onto the inner wall of the first-stage dust removal chamber through a nozzle to form a stable water film. The outer end of the air inlet pipe is connected to an exhaust gas source, and its inner end is oriented towards the tangential direction of the first-stage dust removal chamber. The dust-laden exhaust gas enters the inner cavity of the first-stage dust removal chamber tangentially and undergoes centrifugal motion. The dust is captured by the water film and forms a first-stage centrifugal dust removal process.

[0007] The second-stage dust removal chamber is equipped with a No. 2 water distribution pipe, which is connected to a high-pressure water source and sprays water onto the inner wall of the second-stage dust removal chamber through nozzles to form a water film. At least three sets of No. 1 Venturi tubes are evenly distributed along the circumference between the first-stage dust removal chamber and the second-stage dust removal chamber. Each No. 1 Venturi tube consists of a bell mouth, a converging section, and a spray nozzle. The bell mouth is located in the first-stage dust removal chamber and serves as the air inlet. The spray nozzle is located in the second-stage dust removal chamber and faces the tangential direction of the inner cavity. The dust-laden exhaust gas is accelerated a second time after passing through the No. 1 Venturi tube and is continuously sprayed towards the tangential direction of the inner cavity of the second-stage dust removal chamber. The dust is captured by the water film and forms a two-stage centrifugal dust removal process.

[0008] The third-stage dust removal chamber is equipped with a No. 3 water distribution pipe, which is connected to a high-pressure water source and sprays water onto the inner wall of the third-stage dust removal chamber through nozzles to form a water film. At least three sets of No. 2 Venturi tubes are evenly distributed along the circumference between the second-stage dust removal chamber and the third-stage dust removal chamber. The dust-laden exhaust gas is accelerated again after passing through the No. 2 Venturi tubes and is continuously sprayed towards the tangential direction of the inner cavity of the third-stage dust removal chamber. The dust is captured by the water film and forms a three-stage centrifugal dust removal process.

[0009] Furthermore, a dehumidification mechanism is provided between the return air duct and the exhaust fan to remove water droplets entrained in the gas and ensure that the outlet gas is dry.

[0010] Furthermore, a sludge removal mechanism is installed at the bottom of the third-stage dust removal chamber where a water seal structure is set up to filter and discharge the sludge in the tank.

[0011] Furthermore, the return air duct is provided with a flange cover and a water seal groove arranged from top to bottom.

[0012] Furthermore, the first-stage dust removal chamber is enclosed by a No. 1 tower and a return air duct. The No. 1 tower is a shell-like structure composed of a cylinder body, an upper flange cover, a lower flange cover, a bottom plate, and a wing plate. The upper flange cover is located at the top of the cylinder body and is securely connected to the flange cover on the return air duct. The lower flange cover is located on the outer side of the middle and lower section of the cylinder body and is mechanically fixedly connected to the No. 2 tower. The bottom plate is located at the lower end of the cylinder body and is turned down to form a wing plate, which is water-sealed to the water seal groove on the return air duct.

[0013] Furthermore, the second-stage dust removal chamber is enclosed by a second tower and a return air duct. The second tower is a shell-like structure composed of a cylinder, an upper flange cover, a lower flange cover, a bottom plate, and wing plates. The upper flange cover is located at the top of the cylinder and is fastened to the first tower. The lower flange cover is located on the outer side of the middle and lower section of the cylinder and is mechanically fixed to the third tower. The bottom plate is located at the lower end of the cylinder and is turned down to form a wing plate, which is connected to the water seal groove on the return air duct.

[0014] Furthermore, the third-stage dust removal chamber is enclosed by a third tower and a return air duct. The third tower is a shell-like structure composed of a cylinder, an upper flange cover, a bottom plate, and a wing plate. The upper flange cover is located at the top of the cylinder and is fastened to the second tower. The bottom plate is located at the lower end of the cylinder and is turned down to form a wing plate, which is connected to the water seal groove.

[0015] The beneficial effects of this invention are: the solution of this invention achieves three-stage high-efficiency dust removal within a limited volume through the vertical integration and nesting of three-stage centrifugal water film. It not only inherits the advantages of traditional centrifugal water film dust collectors in terms of compact structure and reliable operation, but also significantly improves dust removal efficiency through three-stage series connection. It is suitable for various dust-containing waste gas and flue gas treatment scenarios such as small and medium-sized boilers, industrial kilns, and crushing workshops. Attached Figure Description

[0016] Figure 1 This is a perspective view of the core device in Embodiment 1.

[0017] Figure 2 This is the front view of Embodiment 1.

[0018] Figure 3 for Figure 1 A sectional view.

[0019] Figure 4 for Figure 3 Sectional view at point A--A.

[0020] Figure 5 for Figure 3 Sectional view at point B-B.

[0021] Figure 6 This is a structural diagram of the return air duct 400.

[0022] Figure 7 This is a cross-sectional view of tower No. 1.

[0023] Figure 8 This is a cross-sectional view of Example 2.

[0024] In the picture:

[0025] 100. Tower No. 1; 110. First-stage dust removal chamber; 120. Air inlet duct; 130. Water distribution pipe No. 1; 140. Venturi tube No. 1; 150. First-stage water seal structure; 111. Shell; 112. Upper flange cover; 113. Lower flange cover; 114. Base plate; 115. Flange plate; 200. Tower No. 2; 210. Second-stage dust removal chamber; 220. Venturi tube No. 2; 230. Water distribution pipe No. 2; 240. Second-stage water seal structure; 300. Tower No. 3; 310. Third-stage dust removal chamber; 320. Water distribution pipe No. 3; 330. Water seal trough; 400. Return air duct; 500. Bracket. Detailed Implementation

[0026] The dust-laden exhaust gas treatment equipment described in this embodiment adopts a vertical three-stage series structure. The dust-laden gas flows from top to bottom through the three-stage centrifugal water film dust removal chambers. Each stage (unit) independently completes one "centrifugal separation + water film capture" process. Through the continuous action of the three stages, high-efficiency dust removal is achieved. Compared with the traditional single-stage water film dust removal, the three-stage structure achieves a doubling of the number of dust removal times within the same cylinder height, thereby significantly improving the dust removal efficiency without significantly increasing the equipment volume.

[0027] Example 1, this example will be described in conjunction with the appendix to the specification. Figure 1 To be continued Figure 7 Please provide a detailed explanation.

[0028] This device adopts an integrated unit module design, with each module nested within the other, resulting in a compact structure. The device has a tower structure, specifically a three-stage dust removal structure consisting of upper, middle, and lower dust removal chambers installed together.

[0029] The equipment can be mechanically divided into four parts: Tower 1 (100), Tower 2 (200), Tower 3 (300), and Return Air Duct (400). Towers 100, 200, and 300 are arranged from top to bottom in terms of height, with their diameters gradually increasing. The Return Air Duct (400) is arranged from top to bottom. Specifically, the upper end of the Return Air Duct (400) has a connecting flange, which is connected to an exhaust fan via a pipe to create a negative pressure exhaust system. The lower end of the Return Air Duct (400) is located inside the cavity of Tower 300, and the exhaust fan connected to the top draws air from the cavity of Tower 300, creating negative pressure.

[0030] A ring-shaped flange cover is welded and fixed to the upper section of the return air duct 400. This flange cover is used for mechanical fixation to the No. 1 tower 100. Specifically, during mechanical assembly, the No. 1 tower 100 is first installed from top to bottom through the flange cover of the return air duct 400 and fixed with several bolts. After installation, the No. 1 tower 100 and the flange cover are fixedly installed, and sealing rubber gaskets are placed at the mechanical mating surfaces of the two to form a sealed connection.

[0031] The structure of Tower 100 is as follows: it is a shell-like structure composed of a cylinder 111, an upper flange cover 112, a lower flange cover 113, a base plate 114, and a wing plate 115. It is equipped with an air inlet pipe 120, a first water distribution pipe 130, and a first venturi pipe 140, forming a tangential air inlet and annular water distribution film structure. This part is entirely made of weathering steel, with an anti-corrosion lining on the inner wall to improve durability. Specifically, the diameter of the cylinder 111 of Tower 100 is twice the diameter of the return air duct 400. The upper flange cover 112 is located at the top of the cylinder 111 and is bolted to the flange cover on the return air duct 400. The lower flange cover 113 is located on the outer side of the lower middle section of the cylinder 111 and is welded in place. Bolt holes are provided on the lower flange cover 113 for mechanical fixing to Tower 200 via bolts. The base plate 114 is located at the lower end of the cylinder 111 and extends inward to a distance of five centimeters from the outer wall of the return air duct 400. A wing plate 115 is formed by turning downwards at the inner diameter of the base plate 114. A gap of approximately three centimeters is maintained between the wing plate 115 and the outer wall of the return air duct 400, which is used for the collection of overflow water from the water film. Correspondingly, a water seal groove is provided on the outer wall of the return air duct 400. This water seal groove is a U-shaped groove formed by welding a steel plate to the outer wall of the return air duct 400, allowing the lower part of the aforementioned wing plate 115 to be inserted into the water seal groove. When water collects in the groove, a first-stage water seal structure 150 is formed, and the water film water collected in the first tower 100 can smoothly pass through this area. Four air inlet pipes 120 are installed at the upper section of the cylinder, welded and installed from the front, back, left, and right sides respectively. The outer end of each air inlet pipe 120 is a connecting flange, which is mechanically connected to an annular air duct (not shown in the figure) after convergence, serving as the air outlet for dust-laden exhaust gas. The inner end of each air inlet pipe 120 is located inside the cavity of the first tower 100, and the air inlet pipe 120 is arranged along the tangential direction of the first tower 100. This arrangement allows the exhaust gas to enter the cavity of the first tower 100 at high speed and in a tangential direction, and to move in a spiral motion along the inner wall of the first tower 100. At the same time, a first water distribution pipe 130 is also installed at the top of the cavity of the first tower 100. The first water distribution pipe 130 is an annular water pipe with multiple nozzles fixedly installed at equal intervals on it, spraying water towards the inner wall of the cylinder, preferably installed at an angle towards the cylinder wall, so as to form a water film on the inner wall of the first tower 100 by spraying water. The annular space between the No. 1 tower 100 and the return air duct 400 forms the first-stage dust removal chamber 110.

[0032] A first venturi tube 140 is installed in the lower section of the first tower 100. The first venturi tube 140 passes through the body of the first tower 100, with its inner end located inside the first tower 100 and protruding about 3-5 cm from the inner wall of the first tower 100. Its outer end is located inside the second tower 200 and faces the tangential direction of the inner cavity of the second tower 200.

[0033] The No. 1 Venturi tube 140 consists of a bell mouth, a contraction section, and a jet nozzle. The bell mouth is located inside the No. 1 tower 100 and serves as the air inlet. As the flue gas gradually narrows through the contraction section, the airflow is accelerated again due to the gradually decreasing cross-section of the contraction section. The airflow speed reaches its maximum at the jet nozzle, which has the smallest cross-section, and is then sprayed tangentially towards the inner cavity of the No. 2 tower 200, forming a strong spiral centrifugal motion. After being accelerated again, the wind speed returns to 20 to 24 meters per second, significantly improving the dust removal efficiency.

[0034] First-stage dust removal chamber 110: This dust removal chamber is designed to supply dust-laden gas from four directions: front, back, left, and right. The dust-laden gas enters the inner cavity at high speed tangentially from the cylinder wall of this unit, with an inlet velocity of 20 to 24 meters per second, forming a strong swirling downward airflow within the cylinder. The air inlet is located at the top of the unit. Simultaneously, water sprayed from nozzles forms a continuous water film from top to bottom along the inner wall of the cylinder. When the dust-laden exhaust gas enters the inner cavity in a tangential swirling manner, the dust contained within... Dust particles are thrown against the cylinder wall under the action of high-speed centrifugal force. The dust particles are wetted and adsorbed by the water film and discharged into the water seal trough at the bottom with the water flow. The function of the water seal trough is to prevent the airflow from running around in the first and second stage dust removal chambers 210 and to allow the overflow of wastewater in the inner cylinder of the first stage dust removal chamber 110. After the first stage dust removal, the coarse dust removal function can be basically achieved, and most of the large-diameter dust in the exhaust gas can be removed. The first stage dust removal of this design reaches a level similar to that of traditional dust removal, laying the foundation for the subsequent two stages of fine dust removal.

[0035] Similar to the structure of tower 100, tower 200 is a shell-like structure consisting of a cylinder, upper flange cover, lower flange cover, bottom plate and wing plate, and is equipped with water distribution pipe 230 and venturi pipe 220. The difference is that the diameter of tower 200 is about three times the diameter of return air duct 400. Venturi pipe 220 connects tower 200 and tower 300 and forms a second-stage dust removal chamber 210 in the inner cavity of tower 200. The gas, after being preliminarily purified in the first stage, continues to rotate and descend. The airflow passes through the second Venturi tube 220 between the two dust removal chambers and enters the inner cavity of the second dust removal chamber 210. Note that the orientation of the second Venturi tube 220 is consistent with the direction of the airflow spiral. Through the confinement effect of the second Venturi tube 220, the airflow velocity can be effectively increased, so that the airflow velocity entering the inner cavity of the second dust removal chamber 210 for the first time is restored to 20 to 24 meters per second. Similarly, in the second-stage dust removal chamber, the airflow forms a strong rotating downward airflow within the cylinder. At the same time, the nozzle is located above the air inlet, spraying water above the air inlet. The water sprayed from the nozzle forms a continuous water film from top to bottom along the inner wall of the cylinder. Dust particles are thrown against the cylinder wall under the action of high-speed centrifugal force. The dust particles are wetted and adsorbed by the water film and discharged downward with the water flow into the water seal trough at the bottom. The function of the water seal trough is to prevent the airflow from running around in the second and third-stage dust removal chambers 310, forming a second-stage water seal structure 240, and realizing the overflow of wastewater in the inner cylinder of the second-stage dust removal chamber 210, thus achieving the second-stage dust removal of the exhaust gas.

[0036] Similar to the structure of tower 100, tower 300 is a shell-like structure consisting of a cylinder, upper flange cover, bottom plate, and wing plates, and is equipped with a third water distribution pipe 320. The difference is that the bottom plate of tower 300 is a conical steel plate, forming a neck, and the wing plate at the neck position is inserted into a water seal groove 330. This water seal groove 330 is separately installed, rather than being located on the return air duct 400. The bottom of the return air duct 400 is located in the third-stage dust removal chamber 310 inside tower 300, and is centrally positioned. The gas, purified again in the second stage, continues to rotate and descend. The airflow passes through the second Venturi tube 220 between the two dust removal chambers and enters the inner cavity of the third dust removal chamber 310. Note that the orientation of the second Venturi tube 220 is consistent with the direction of the airflow spiral. Through the confinement effect of the second Venturi tube 220, the airflow velocity can be effectively increased, allowing the initial airflow velocity entering the inner cavity of the third dust removal chamber 310 to recover to 20 to 24 meters per second. The nozzle assembly of the third water distribution pipe 320 is located above the air inlet, spraying water above the air inlet. The water sprayed from the nozzle forms a continuous water film from top to bottom along the inner wall of the cylinder. Dust particles are thrown against the cylinder wall under the action of high-speed centrifugal force. The dust particles are wetted and adsorbed by the water film and discharged downward with the water flow into the water seal trough at the bottom. The function of the water seal trough is to prevent the airflow from overflowing and to achieve the sedimentation of wastewater and its carried sludge.

[0037] In this embodiment, the three-tiered dust removal chambers are arranged layer by layer from top to bottom in a tower-like configuration, which has significant technical advantages.

[0038] Furthermore, mounting brackets 500 are welded to the outside of the No. 3 tower 300, and the device is fixedly installed on the foundation by steel columns to maintain stability.

[0039] A return air duct 400 is installed at the center of the device, running from top to bottom. The bottom of the return air duct 400 is inserted into the middle of the third-stage dust removal chamber 310, and the airflow in the chamber is guided from bottom to top to the top. The top has a connecting flange and an external exhaust fan, which is used to provide continuous negative pressure.

[0040] Furthermore, an axial flow swirl vane mechanism (not shown in the figure) is installed between the return air duct 400 and the exhaust fan. As the gas continues to rise, the swirl vanes perform final centrifugal separation of the airflow, throwing water droplets against the duct wall for dehydration. The water flows back along the return air duct 400. After this gas-water separation, dust-laden water droplets entrained in the gas are removed, ensuring that the outlet gas is dry.

[0041] Furthermore, a filter press and sludge discharge mechanism (not shown in the figure) is provided in conjunction with the water seal tank 330 at the bottom. This mechanism is used to filter and discharge the sludge in the tank to ensure the continuous operation of the equipment.

[0042] Example 2

[0043] The difference between this embodiment and Embodiment 1 is that the three-layer dust removal chamber presents an inverted pyramid structure, as shown in the reference. Figure 8 In this embodiment, the diameter of tower 100 is the largest and the diameter of tower 300 is the smallest. This method still achieves the normal flow guiding function through the irregular design of venturi tube 140.

[0044] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention.

Claims

1. A dust-laden waste gas treatment device, comprising a first-stage dust removal chamber (110), a second-stage dust removal chamber (210), and a third-stage dust removal chamber (310) arranged from top to bottom, wherein a return air duct (400) is externally connected to the top of the return air duct (400), and the return air duct (400) passes through the three dust removal chambers from top to bottom, with the lower end of the return air duct (400) located in the third-stage dust removal chamber (310), and water seal structures are provided between adjacent dust removal chambers and at the bottom of the third-stage dust removal chamber (310), characterized in that, The first-stage dust removal chamber (110) is equipped with a first water distribution pipe (130) and an air inlet pipe (120). The first water distribution pipe (130) is connected to a high-pressure water source and sprays water onto the inner wall of the first-stage dust removal chamber (110) through a nozzle to form a stable water film. The outer end of the air inlet pipe (120) is connected to a waste gas source and the inner end is set towards the tangential direction of the first-stage dust removal chamber (110). The dust-laden waste gas enters the inner cavity of the first-stage dust removal chamber (110) in the tangential direction and undergoes centrifugal motion. The dust is captured by the water film and forms a first-stage centrifugal dust removal. A second water distribution pipe (230) is installed in the second-stage dust removal chamber (210). The second water distribution pipe (230) is connected to a high-pressure water source and sprays water onto the inner wall of the second-stage dust removal chamber (210) through a nozzle to form a water film. At least three sets of first venturi tubes (140) are evenly distributed along the circumference between the first-stage dust removal chamber (110) and the second-stage dust removal chamber (210). The first venturi tube (140) consists of a bell mouth, a converging section and a spray nozzle. The bell mouth is located in the first-stage dust removal chamber (110) and serves as the air inlet. The spray nozzle is located in the second-stage dust removal chamber (210) and faces the tangential direction of the inner cavity. The dust-laden exhaust gas is accelerated twice after passing through the first venturi tube (140) and is continuously sprayed towards the tangential direction of the inner cavity of the second-stage dust removal chamber (210). The dust is captured by the water film and forms a secondary centrifugal dust removal process. The third-stage dust removal chamber (310) is equipped with a No. 3 water distribution pipe (320). The No. 3 water distribution pipe (320) is connected to a high-pressure water source and sprays water onto the inner wall of the third-stage dust removal chamber (310) through a nozzle to form a water film. At least three sets of No. 2 Venturi tubes (220) are evenly distributed along the circumference between the second-stage dust removal chamber (210) and the third-stage dust removal chamber (310). The dust-laden exhaust gas is accelerated again after passing through the No. 2 Venturi tube (220) and continuously sprayed towards the tangential direction of the inner cavity of the third-stage dust removal chamber (310). The dust is captured by the water film and forms a three-stage centrifugal dust removal.

2. The dust-laden waste gas treatment equipment according to claim 1, characterized in that, A dehumidification mechanism is installed between the return air duct (400) and the exhaust fan to remove water droplets entrained in the gas and ensure that the outlet gas is dry.

3. The dust-laden waste gas treatment equipment according to claim 1, characterized in that, The bottom of the third-stage dust removal chamber (310) is equipped with a water seal structure and a filter press sludge discharge mechanism to filter and discharge the sludge in the tank.

4. The dust-laden waste gas treatment equipment according to claim 3, characterized in that, The return air duct (400) is provided with a flange cover and a water seal groove arranged from top to bottom.

5. The dust-laden waste gas treatment equipment according to claim 4, characterized in that, The first-stage dust removal chamber (110) is enclosed by a first tower (100) and a return air duct (400). The first tower (100) is a shell structure composed of a cylinder, an upper flange cover, a lower flange cover, a bottom plate, and a wing plate. The upper flange cover is located at the top of the cylinder and is fastened to the flange cover on the return air duct (400). The lower flange cover is located on the outer side of the middle and lower section of the cylinder and is mechanically fixed to the second tower (200). The bottom plate is located at the lower end of the cylinder and is turned down to form a wing plate. The wing plate is water-sealed to the water seal groove on the return air duct (400).

6. The dust-laden waste gas treatment equipment according to claim 4, characterized in that, The second-stage dust removal chamber (210) is enclosed by the second tower (200) and the return air duct (400). The second tower (200) is a shell structure composed of a cylinder, an upper flange cover, a lower flange cover, a bottom plate, and a wing plate. The upper flange cover is located at the top of the cylinder and is fastened to the first tower (100). The lower flange cover is located on the outer side of the middle and lower section of the cylinder and is mechanically fixed to the third tower (300). The bottom plate is located at the lower end of the cylinder and is turned down to form a wing plate. The wing plate is water-sealed to the water seal groove on the return air duct (400).

7. The dust-laden waste gas treatment equipment according to claim 4, characterized in that, The third-stage dust removal chamber (310) is enclosed by the third tower (300) and the return air duct (400). The third tower (300) is a shell structure composed of a cylinder, an upper flange cover, a bottom plate and a wing plate. The upper flange cover is located at the top of the cylinder and is fastened to the second tower (200). The bottom plate is located at the lower end of the cylinder and is turned down to form a wing plate, which is connected to the water seal groove.

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