Liquid flotation device for dust removal spray tower

Abstract

The invention relates to, in particular to a liquid flotation device for a dust removal spray tower. Comprising a spraying tower, a supporting frame, a flotation barrel, a circulating assembly, an impurity removal assembly and a pollution discharge assembly. The circulating assembly comprises a suction pipe, a circulating pump, a circulating pipe, a spraying pipe and a rotational flow pipe; the impurity removing assembly comprises a central impurity collecting barrel, the central impurity collecting barrel is provided with a conical impurity collecting barrel, overflow through holes are formed in the central impurity collecting barrel, and a conical flow guide cover is arranged on the central impurity collecting barrel; the floating scraping and collecting frame comprises an annular floating ring and radial scraping rods, and the radial scraping rods are uniformly fixed along the inner side of the annular floating ring; the sewage discharging assembly comprises a sewage discharging opening which is formed in the bottom of the flotation barrel. The conical impurity collecting barrel and the flow guide cover are used for guiding rotational flow to collect settled impurities on the lower middle portion, meanwhile, the floating scraping and collecting frame rotates on the liquid level to scrape and collect light floating objects, two-way synchronous separation is achieved, a blocking filter screen and a complex double-fan-blade transmission structure are thoroughly abandoned, and the continuous operation stability of the system is improved.

Description

Technical Field

[0001] This invention relates, and more particularly, to a liquid flotation device for a dust removal spray tower. Background Technology

[0002] Dust scrubbing towers are widely used in industrial flue gas purification systems, where they capture particulate matter in the flue gas through circulating spray liquid. To save water resources, the industry generally adopts a spray liquid circulation mode, but impurities in the circulating liquid will continuously accumulate, reducing spray efficiency and eventually clogging the system.

[0003] In the existing technology, common flotation impurity removal devices mostly rely on filter screen interception or simple gravity settling structure, which has obvious defects: the filter screen is easily clogged by impurities, requiring frequent shutdowns for cleaning and replacement, affecting continuous operation; a single structure cannot simultaneously handle both settling and floating impurities, resulting in incomplete impurity removal; the spraying, circulation and impurity removal units are mostly designed separately, requiring independent drive devices, resulting in low overall mechanical integration, loose structure and high energy consumption. Summary of the Invention

[0004] To overcome the shortcomings of easy filter clogging, inability to simultaneously handle sedimentation and flotation, and separate design for circulation and impurity removal, the technical problem to be solved is to provide a liquid flotation device for dust removal spray towers.

[0005] The technical solution of the present invention is: a liquid flotation device for a dust removal spray tower, comprising a spray tower, a support frame, a flotation tank, a circulation component, a dirt removal component, and a sewage discharge component; The support frame is disposed at the bottom of the spray tower, the flotation tank is coaxially fixed to the bottom of the inside of the spray tower, the circulation component is disposed between the spray tower and the flotation tank, and the impurity removal component is disposed inside the flotation tank; The circulation assembly includes a suction pipe, a circulation pump, a circulation pipe, a spray pipe, and a cyclone pipe. The cyclone pipe is arranged along the tangential direction inside the flotation tank to drive the liquid to form a cyclone. The impurity removal component includes: A central impurity collector is coaxially fixed to the flotation tank. The central impurity collector is provided with a conical impurity collector, an overflow hole is provided on the central impurity collector, and a conical flow guide is provided on the central impurity collector. The floating scraper includes an annular floating ring and a radial scraper. The annular floating ring is adapted to the inner diameter of the flotation tank and is suspended on the liquid surface. The radial scraper is uniformly fixed along the inner side of the annular floating ring and its bottom is attached to the liquid surface. The wastewater discharge assembly includes a wastewater discharge port, which is located at the bottom of the flotation tank and is coaxially connected to the central aggregate collection cylinder.

[0006] As a preferred embodiment of the present invention, a sliding frame is slidably connected inside the flotation tank, the sliding frame is fixedly connected to the annular flotation ring, and an overflow edge is provided on the sliding frame.

[0007] As a preferred embodiment of the present invention, the central hybrid collection cylinder is hollow and telescopic, and the bottom of the central hybrid collection cylinder is provided with uniformly distributed hybrid collection inlets. The top end of the conical flow guide is fixed to the central hybrid collection cylinder, and the bottom end of the conical flow guide extends to the outside of the hybrid collection inlet of the central hybrid collection cylinder. The conical hybrid collection cylinder is conical in shape opposite to that of the conical flow guide.

[0008] As a preferred embodiment of the present invention, the height of the overflow orifice is higher than the top of the conical guide shroud and lower than the liquid surface where the annular floating ring is suspended. The overflow orifice is a conical orifice that is narrow on the outside and wide on the inside, with the inner diameter being larger than the outer diameter.

[0009] As a preferred embodiment of the present invention, the radial scraper is made of elastic metal and comprises a horizontal scraper and a quarter-circular arc-shaped scraper, and a filter screen is provided on the radial scraper.

[0010] As a preferred embodiment of the present invention, the central collection cylinder is slidably connected to a power gear, the power gear is rotatably connected to the floating scraper frame, the radial scraper is rotatably connected to a rotating shaft, the rotating shaft is rotatably connected to the floating scraper frame, the rotating shaft is provided with a helical gear, the helical gear of the rotating shaft meshes with the power gear, and the rotating shaft has uniformly distributed scraper blades symmetrically distributed about the axis of the axis.

[0011] As a preferred embodiment of the present invention, the radial scraper is fixedly connected to a fixed shaft, the fixed shaft is rotatably connected to the rotating shaft, the fixed shaft is fixedly connected to a uniformly distributed eccentric wheel, the rotating shaft is slidably connected to a uniformly distributed push rod, an elastic element is provided between the push rod and the rotating shaft, and the push rod and the eccentric wheel are in a limiting contact engagement.

[0012] As a preferred embodiment of the present invention, the radial scraper is provided with a collection groove and a collection cavity, the floating scraper frame is provided with a negative pressure pump, the negative pressure pump is connected to the collection cavity, and the collection cavity of the radial scraper is provided with uniformly distributed absorption holes near the collection groove.

[0013] As a preferred embodiment of the present invention, an anti-vortex cover is provided at one end of the suction pipe extending to the bottom of the flotation tank. The anti-vortex cover is hemispherical and has uniformly distributed through holes on its surface.

[0014] The sewage discharge assembly also includes a suction component and a sealing flange. The sealing flange is located at the connection between the sewage discharge port and the flotation tank, and a sealing ring is provided on the inner side.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention guides the swirling flow to collect the sedimented impurities in the middle and lower parts through the conical impurity collecting cylinder and the flow guide hood, while using the floating scraper to scrape the light floating objects on the liquid surface, achieving bidirectional synchronous separation, completely eliminating the need for filter screen clogging and complex double fan blade drive structure, and improving the continuous operation stability of the system. The tangential jets of the circulation mechanism serve as both the power source for the spraying and the direct drive for the movement of the swirling flow inside the tank and the scraper frame. No additional motors or transmission components are required, resulting in a compact structure, low failure rate, and easy installation and maintenance. The annular floating ring drives the scraper frame to adapt to changes in liquid level, ensuring that the scraper blades are always at the liquid surface and guaranteeing scraping effect under different working conditions. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention.

[0018] Figure 3 This is a three-dimensional cross-sectional view of the flotation tank of the present invention.

[0019] Figure 4 This is a three-dimensional cross-sectional view of the circulation component of the present invention.

[0020] Figure 5 This is a three-dimensional cross-sectional view of the impurity removal component of the present invention.

[0021] Figure 6 This is a three-dimensional cross-sectional view of the radial scraper structure of the present invention.

[0022] The components are as follows: 1. Spray tower, 2. Support frame, 3. Flotation tank, 31. Sliding frame, 32. Overflow side, 4. Air inlet, 5. Exhaust outlet, 6. Circulation component, 61. Suction pipe, 62. Circulation pump, 63. Circulation pipe, 64. Spray pipe, 65. Cyclone pipe, 7. Impurity removal component, 71. Central impurity collector, 711. Conical impurity collector, 712. Overflow orifice, 713. Conical guide shroud, 72. Floating scraper, 721. Annular floating ring, 722. Radial scraper, 723. Power gear, 724. Rotating shaft, 725. Scraper blade, 726. Push rod, 727. Fixed shaft, 728. Eccentric wheel, 729. Negative pressure pump, 8. Sewage outlet, 9. Suction component. Detailed Implementation

[0023] First, it should be noted that in different described embodiments, the same components are given the same reference numerals or the same component names. The disclosure contained throughout this specification can be applied semantically to the same components having the same reference numerals or the same component names. The location descriptions selected in the specification, such as upper, lower, lateral, etc., also refer to the directly described and illustrated figures and are semantically applied to the new location when the location changes. Example 1

[0024] A liquid flotation device for a dust removal spray tower, such as Figure 1-6 As shown, the system includes a spray tower 1, which is fixed by a support frame 2 at the bottom. The core component for purification, the flotation tank 3, is coaxially mounted and fixed to the bottom of the spray tower 1, forming an independent internal cavity. The flue gas treatment system and the liquid purification system are spatially separated: flue gas enters through the inlet 4 in the middle of the spray tower 1, is purified inside the tower, and is discharged through the exhaust port 5 at the top; while the wastewater carrying impurities falls and collects in the flotation tank 3 for further purification. The circulation component 6 is located between the spray tower 1 and the flotation tank 3, responsible for liquid circulation and providing power to drive the vortex. The impurity removal component 7 is located inside the flotation tank 3, responsible for efficient collection and separation of impurities. The sewage discharge component is located at the bottom of the device, responsible for collecting and discharging the separated impurities.

[0025] The flotation tank 3 is fixed coaxially to the inner wall of the spray tower 1 through its outer wall. A sliding frame 31 is slidably connected inside the flotation tank 3. An overflow edge 32 is provided on the sliding frame 31. The overflow edge 32 constitutes the first mechanical filtration. When the liquid level in the tank rises, only the relatively clear sewage below the liquid surface can overflow into the annular channel between the sliding frame 31 and the flotation tank 3, while the debris floating on the water surface is blocked in the main cavity, achieving preliminary separation.

[0026] The circulation assembly 6 includes a suction pipe 61, a circulation pump 62, a circulation pipe 63, a spray pipe 64, and a cyclone pipe 65. The inlet section of the suction pipe 61 extends into the bottom of the flotation tank 3 to remove wastewater. The inlet end of the circulation pipe 63 extends into the annular channel of the flotation tank 3, and the other end is connected to the inlet of the circulation pump 62. The outlet of the circulation pump 62 is connected to the spray pipe 64 and the cyclone pipe 65 through a diversion valve. The cyclone pipe 65 is arranged tangentially along the inner side of the flotation tank 3 to drive the liquid to form a vortex. The circulation pump 62 draws the liquid into the flotation tank 3 at high speed through the tangentially arranged spray pipe, directly using fluid kinetic energy to drive the internal liquid to form a stable vortex, providing the core power source for subsequent impurity separation, and recycling the treated wastewater. The end of the suction pipe 61 extending to the bottom of the flotation tank 3 is equipped with an anti-vortex cover. The anti-vortex cover is hemispherical, and the surface of the cover has evenly distributed through holes to prevent the vortex from affecting the discharge efficiency when the water is discharged, and to filter the sedimented impurities.

[0027] The impurity removal component 7 includes: like Figures 3-5 As shown, a central impurity collector 71 is vertically and coaxially fixed at the center of the bottom of the flotation tank 3. The central impurity collector 71 is hollow and telescopic. The bottom of the central impurity collector 71 has evenly distributed impurity inlets. A conical impurity collector 711 is fixedly connected to the central impurity collector 71. The bottom end of the conical guide shroud 713 extends to the outside of the impurity inlet of the central impurity collector 71. An overflow hole 712 is provided on the central impurity collector 71. The height of the overflow hole 712 is higher than the top of the conical guide shroud 713 but lower than the liquid surface where the annular flotation ring 721 is suspended. The overflow hole 712 is a conical hole that is narrower on the outside and wider on the inside, with the inner diameter larger than the outer diameter. The through-hole 712 only allows the middle layer of purified liquid to overflow smoothly under the action of liquid level difference and flow back into the flotation tank, while completely isolating the impurities in the upper and lower layers inside the tank, thus achieving efficient solid-liquid separation. A conical guide hood 713 is provided on the central impurity collection cylinder 71. The conical impurity collection cylinder 711 and the conical guide hood 713 are opposite in shape. Under the action of swirling centrifugal force, the sedimented particles are thrown towards the cylinder wall and slide down the cylinder wall. The flaring mechanism of the conical impurity collection cylinder 711 forms a converging area, which initially gathers and collects the sedimented impurities. The guide hood guides and constrains the gathered impurities, ensuring that all impurities pass smoothly and without backflow through the impurity collection inlet and completely enter the internal cavity of the central impurity collection cylinder 71.

[0028] like Figure 5 and Figure 6 As shown, the floating scraper 72 includes an annular float ring 721 and a radial scraper 722. The annular float ring 721 is adapted to the inner diameter of the flotation tank 3 and is suspended on the liquid surface. The radial scraper 722 is uniformly fixed along the inner side of the annular float ring 721, and its bottom is set in contact with the liquid surface. The annular float ring 721 drives the radial scraper 722 and the sliding frame 31 to perform liquid flotation according to the liquid level, ensuring that the scraper always acts accurately on the liquid surface. At the same time, under the drive of the swirling flow, the entire scraper 722 rotates, and the radial scraper 722 continuously scrapes and collects floating oil, foam and light impurities on the liquid surface, collecting them into the central impurity collection cylinder 71 cavity.

[0029] The radial scraper 722 is made of elastic metal and consists of a horizontal scraper and a quarter-circular arc-shaped scraper. A filter screen is provided on the radial scraper 722 to prevent fine impurities from passing through.

[0030] A central dust collector 71 is slidably connected to a power gear 723, which is rotatably connected to a floating scraper frame 72. A radial scraper rod 722 is rotatably connected to a rotating shaft 724, which is also rotatably connected to the floating scraper frame 72. The rotating shaft 724 is equipped with a helical gear that meshes with the power gear 723. The rotating shaft 724 has uniformly distributed scraper blades 725 that are symmetrically distributed around its axial center. The radial scraper rod 722 drives the rotating shaft 724 to revolve around the central axis, while the rotating shaft 724 rotates on its own axis. The edges of the rotating scraper blades 725 continuously scrape the surface of the filter screen, achieving online self-cleaning and preventing the mesh from clogging.

[0031] A fixed shaft 727 is fixedly connected to a radial scraper 722. The fixed shaft 727 is rotatably connected to a rotating shaft 724. An evenly distributed eccentric wheel 728 is fixedly connected to the fixed shaft 727. An evenly distributed push rod 726 is slidably connected to the rotating shaft 724. An elastic element, which is a tension spring, is provided between the push rod 726 and the rotating shaft 724. The push rod 726 makes a limiting contact with the eccentric wheel 728. The rotating shaft 724 drives the push rod 726 to rotate and makes a limiting contact with the contour of the eccentric wheel 728, driving the push rod 726 to perform reciprocating linear motion, periodically pushing off stubborn impurities on the scraper 725.

[0032] A collection trough and a collection chamber are provided on the radial scraper 722. A negative pressure pump 729 is provided inside the floating scraper frame 72. The negative pressure pump 729 is connected to the collection chamber. The collection chamber of the radial scraper 722 is provided with uniformly distributed absorption holes near the collection trough. The negative pressure pump 729 quickly collects floating impurities and transports them to the central impurity collection cylinder 71, so that all impurities in the sewage are collected in the central impurity collection cylinder 71, which facilitates subsequent overall collection.

[0033] The sewage discharge assembly also includes a suction component 9 and a sealing flange. The sealing flange is located at the connection between the sewage discharge port 8 and the flotation tank 3. The sewage discharge port 8 is coaxially connected to the central impurity collection cylinder 71 and has a sealing ring on the inside. The suction component is activated periodically to efficiently and thoroughly discharge the various impurities collected and concentrated in the central impurity collection cylinder 71 from the system, completing the last step of the entire purification process.

[0034] Dust-laden industrial flue gas enters the spray tower 1 through the air inlet 4 in the middle of the spray tower 1. Driven by the circulation component 6, the annular spray pipe 64 at the top of the spray tower 1 sprays the atomized spray liquid downwards evenly to form a dense water curtain. The rising flue gas comes into countercurrent contact with the water mist, and the dust particles in it are effectively captured by the droplets and sink downwards with the flue gas, collecting in the flotation tank 3 at the bottom. The spray liquid is thus transformed into wastewater carrying impurities. The flue gas treated by the spray is discharged through the exhaust port 5.

[0035] After the wastewater falls into the flotation tank 3, the liquid level gradually rises. When the liquid level rises to the annular overflow edge 32 inside the flotation tank 3, the wastewater will evenly enter the annular buffer gap formed between the sliding frame 31 and the flotation tank 3. This overflow process itself constitutes a primary mechanical filtration. Larger floating objects and some suspended objects are blocked by the overflow edge 32 in the main cavity of the flotation tank 3, while the relatively clear overflow liquid enters the annular channel to provide pre-treated water for subsequent circulation.

[0036] At this time, the circulation pump 62 starts and directly draws the sewage that has been filtered by the overflow side 32 and is located in the annular buffer channel through the circulation pipe 63. This part of sewage is pressurized by the circulation pump 62 and divided into two paths: the main spray flow, one of which is transported through the circulation pipe 63 to the spray pipe 64 at the top of the spray tower 1 to maintain continuous spray dust removal and swirling drive flow, and the other is transported to the spray pipe arranged along the tangential direction of the side wall of the flotation tank 3, which is sprayed into the main cavity of the flotation tank 3 at high speed, driving the internal liquid to form a rotating vortex.

[0037] Under the centrifugal force of the swirling flow, the sedimentation particles of the sewage in the main cavity are thrown against the cylinder wall, slide down and are captured by the conical impurity collecting cylinder 711, and gather around the inlet at the bottom of the central collecting cylinder, completing the initial enrichment of impurities. Then, under the action of the conical guide shroud 713, the impurities that have been initially gathered by the conical collecting cylinder are guided, constrained and directionally transported in an orderly manner, ensuring that all impurities pass smoothly and without backmixing through the impurity collecting inlet and completely enter the internal cavity of the central impurity collecting cylinder 71.

[0038] Meanwhile, the annular floating ring 721 suspended on the surface of the sewage is driven to rotate by the swirling flow. The radial scraper 722 on it scrapes and collects the floating objects on the liquid surface. As the floating ring revolves, the radial scraper 722 drives the rotating shaft 724 to rotate. The rotating shaft 724 rotates under the meshing action of the power gear 723. The scraper 725 pulls the floating objects on the liquid surface to the center, and at the same time, the rotating edge continuously scrapes the fine filter screen set on the radial scraper 722, forcibly scraping off the impurities that clog the mesh, realizing the online self-cleaning of the filter screen and preventing clogging.

[0039] Inside the scraper, the rotating shaft 724 drives the push rod 726 to rotate. The push rod 726 reciprocates under the action of the fixed shaft 727 and the eccentric wheel 728. The push rod 726 extends periodically to push and remove stubborn impurities that still accumulate on the scraper 725 after it is hung up, ensuring that the scraper 725 is clean.

[0040] The scraped and loosened impurities fall into the collection trough set on the scraper. Under the stable suction generated by the negative pressure pump 729, the impurities are instantly sucked into the collection chamber and then transported through the pipeline to the central impurity collection cylinder 71, where they are combined with the settled impurities. Thus, the entire process is fully enclosed and automated from scraping to collection, with no secondary pollution.

[0041] During the operation of the device, the liquid level of the central impurity collection cylinder 71 is at the same height as that of the flotation tank 3. A surface light impurity floating layer, a middle purification liquid layer, and a sediment impurity layer are formed inside the central impurity collection cylinder 71. The middle purification liquid in the central impurity collection cylinder 71 gradually rises. When the liquid level of the middle purification liquid reaches the minimum hole height of the overflow orifice 712, the middle purification liquid, driven by the liquid level difference, flows back to the clean liquid area outside the flotation tank 3 through the through hole, and prevents the liquid outside the central impurity collection cylinder 71 from not being able to flow back. The surface light impurities and the sediment impurities inside the central impurity collection cylinder 71 are completely trapped inside the central impurity collection cylinder 71. After the impurities accumulate to a preset amount, they are extracted and discharged at once by the sewage discharge component.

[0042] This completes the liquid flotation cycle of dust removal spray tower 1.

[0043] Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A liquid flotation device for a dust removal spray tower, characterized in that: It includes a spray tower (1), a support frame (2), a flotation tank (3), a circulation assembly (6), a waste removal assembly (7), and a sewage discharge assembly; The support frame (2) is located at the bottom of the spray tower (1), the flotation tank (3) is coaxially fixed to the bottom of the spray tower (1), the circulation component (6) is located between the spray tower (1) and the flotation tank (3), and the impurity removal component (7) is located inside the flotation tank (3). The circulation assembly (6) includes a suction pipe (61), a circulation pump (62), a circulation pipe (63), a spray pipe (64), and a cyclone pipe (65). The cyclone pipe (65) is arranged along the tangential direction inside the flotation tank (3) to drive the liquid to form a cyclone. The impurity removal component (7) includes: A central impurity collection cylinder (71) is coaxially fixed to the flotation tank (3). The central impurity collection cylinder (71) is provided with a conical impurity collection cylinder (711), an overflow hole (712) is provided on the central impurity collection cylinder (71), and a conical flow guide shroud (713) is provided on the central impurity collection cylinder (71). The floating scraper (72) includes an annular floating ring (721) and a radial scraper (722). The annular floating ring (721) is adapted to the inner diameter of the flotation tank (3) and is suspended on the liquid surface. The radial scraper (722) is uniformly fixed along the inner side of the annular floating ring (721) and its bottom is attached to the liquid surface. The sewage discharge assembly includes a sewage discharge port (8), which is located at the bottom of the flotation tank (3) and is coaxially connected to the central aggregate cylinder (71).

2. The liquid flotation device for a dust removal spray tower as described in claim 1, characterized in that: A sliding frame (31) is slidably connected inside the flotation tank (3). The sliding frame (31) is fixedly connected to the annular flotation ring (721). An overflow edge (32) is provided on the sliding frame (31).

3. A liquid flotation device for a dust removal spray tower as described in claim 2, characterized in that: The central hybrid collector (71) is hollow and telescopic. The bottom of the central hybrid collector (71) is provided with uniformly distributed hybrid inlets. The top of the conical flow guide (713) is fixed to the central hybrid collector (71). The bottom of the conical flow guide (713) extends to the outside of the hybrid inlet of the central hybrid collector (71). The conical hybrid collector (711) is conical in shape opposite to that of the conical flow guide (713).

4. A liquid flotation device for a dust removal spray tower as described in claim 3, characterized in that: The overflow orifice (712) is higher than the top of the conical guide shield (713) and lower than the liquid surface where the annular floating ring (721) is suspended. The overflow orifice (712) is a conical orifice that is narrow on the outside and wide on the inside, with the inner diameter being larger than the outer diameter.

5. A liquid flotation device for a dust removal spray tower as described in claim 4, characterized in that: The radial scraper (722) is made of elastic metal and consists of a horizontal scraper and a quarter-circular arc-shaped scraper. A filter screen is provided on the radial scraper (722).

6. A liquid flotation device for a dust removal spray tower as described in claim 5, characterized in that: The central collection cylinder (71) is slidably connected to a power gear (723), which is rotatably connected to the floating scraper frame (72). The radial scraper rod (722) is rotatably connected to a rotating shaft (724), which is rotatably connected to the floating scraper frame (72). The rotating shaft (724) is provided with a helical gear, which meshes with the power gear (723). The rotating shaft (724) has uniformly distributed scraper blades (725) symmetrically distributed around its axial center position.

7. A liquid flotation device for a dust removal spray tower as described in claim 6, characterized in that: The radial scraper (722) is fixedly connected to a fixed shaft (727), which is rotatably connected to the rotating shaft (724). The fixed shaft (727) is fixedly connected to an evenly distributed eccentric wheel (728), and the rotating shaft (724) is slidably connected to an evenly distributed push rod (726). An elastic element is provided between the push rod (726) and the rotating shaft (724), and the push rod (726) and the eccentric wheel (728) are in a limiting contact engagement.

8. A liquid flotation device for a dust removal spray tower as described in claim 7, characterized in that: The radial scraper (722) is provided with a collection groove and a collection cavity. The floating scraper frame (72) is provided with a negative pressure pump (729). The negative pressure pump (729) is connected to the collection cavity. The collection cavity of the radial scraper (722) is provided with uniformly distributed absorption holes near the collection groove.

9. A liquid flotation device for a dust removal spray tower as described in claim 8, characterized in that: The suction pipe (61) extends to the bottom of the flotation tank (3) and is provided with an anti-vortex cover. The anti-vortex cover is hemispherical and has uniformly distributed through holes on its surface.

10. The sewage discharge assembly also includes a suction component (9) and a sealing flange. The sealing flange is located at the connection between the sewage discharge port (8) and the flotation tank (3), and a sealing ring is provided on the inner side.

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