Integrated flue gas pollutant cleaning tower

Abstract

This invention belongs to the field of flue gas purification technology and discloses an integrated flue gas pollutant purification tower, comprising: a first water washing section I, including a rectifier, a first spray mechanism, and a first demister; a desulfurization treatment section II, disposed above the first water washing section I, including a first gas-liquid separator, a packing layer, and a liquid distributor; a second water washing section III, disposed above the desulfurization treatment section II, including a second gas-liquid separator, a second spray mechanism, and a second demister; a denitrification treatment section IV, disposed above the second water washing section III, including an ozone mixing device, a fourth gas-liquid separator, and a fourth spray mechanism; a third water washing section V, disposed above the denitrification treatment section IV, including a third gas-liquid separator, a third spray mechanism, and a third demister; and a whitening treatment section VI, disposed above the third water washing section V, including a magnetic energy whitening device; thereby integrating cooling and dust removal, amine desulfurization, ozone oxidation denitrification, flue gas demisting, and flue gas whitening into one unit.

Description

Technical Field

[0001] This invention belongs to the field of flue gas purification technology, and specifically relates to an integrated purification tower for flue gas pollutants. Background Technology

[0002] Flue gas desulfurization in coal-fired power plants commonly uses the lime method, and denitrification commonly uses SCR. These methods have encountered the following intractable problems in actual production: 1. Acid rain and smog issues During coal combustion, as flue gas passes through economizers, and with the commonly used SCR denitrification system, some SO2 is further oxidized to SO3. When flue gas containing gaseous SO3 passes through a wet flue gas desulfurization system, it rapidly forms submicron-sized H2SO4 acid mist, which is difficult to capture. Absorption towers are ineffective against submicron-sized droplets and they are inevitably released into the atmosphere through chimneys, forming acid rain and causing smog. Acid rain leads to a series of problems, including ecosystem damage, building corrosion, water pollution, and negative impacts on human health.

[0003] 2. Ecological damage caused by limestone mining Limestone mining can cause various forms of environmental damage, including destruction of surface vegetation (leading to soil erosion), alteration of topography (increasing the risk of landslides and debris flows), accumulation of waste and slag (occupying land resources), and impact on groundwater resources (changing runoff direction and water level).

[0004] 3. Issues related to the secondary solid waste disposal of by-product desulfurization gypsum Desulfurized gypsum has not been effectively reused in China. Apart from some being used as cement retarders or building gypsum, most of it is still disposed of by stockpiling, which not only occupies a lot of land and wastes resources, but also causes secondary pollution to the surrounding environment.

[0005] 4. Heavy metal pollution problem The flue gas produced during the combustion of coal and other materials contains heavy metals such as lead, cadmium, mercury, chromium, manganese, copper, zinc, and nickel. Some of these heavy metals are fixed on desulfurization gypsum, while others are released into the atmosphere through the flue gas. These heavy metals pollute the environment and pose a threat to human health.

[0006] 5. The catalyst in the ammonia denitrification process consumes precious metals, ultimately forming hazardous waste that is difficult to treat.

[0007] 6. Achieving zero wastewater discharge requires significant investment and operating costs.

[0008] In summary, to fundamentally solve these problems, this application proposes an integrated flue gas pollutant purification tower that uses sodium method, sodium ammonia method, and sodium amine method to complete the integrated flue gas treatment of desulfurization, denitrification, and dust removal. Summary of the Invention

[0009] In view of this, in order to solve the problems mentioned in the background art, the object of the present invention is to provide an integrated purification tower for flue gas pollutants.

[0010] To achieve the above objectives, the present invention provides the following technical solution: An integrated flue gas pollutant purification tower, comprising: The first water washing section I includes a rectifier, a first spray mechanism, and a first demister; The desulfurization treatment section II is located above the first water washing section I and includes a first gas-liquid separator, a packing layer and a liquid distributor; The second water washing section III is located above the desulfurization treatment section II and includes a second gas-liquid separator, a second spraying mechanism, and a second demister. The denitrification treatment section IV is located above the second water washing section III and includes an ozone mixing device, a fourth gas-liquid separator and a fourth spraying mechanism; The third water washing section V is located above the denitrification treatment section IV and includes a third gas-liquid separator, a third spraying mechanism and a third demister. Whitening treatment section VI is located above the third washing section V and includes a magnetic whitening device; The first, second, and third demisters have the same structure, each including a frame and multiple demisting blades vertically spaced within the frame. Adjacent demisting blades form a demisting channel that allows airflow to flow upwards. The demisting channel includes an inlet area, at least two deflection areas, and an outlet area. Adjacent deflection areas have opposite deflection directions. Each deflection area includes a windward side and a leeward side. A first collecting groove is provided at the lower end of the windward side, and a second collecting groove is provided at the lower end of the leeward side.

[0011] Preferably, the defogging channel inlet area is connected to the adjacent lower deflector area through a first guide area. The first guide area has a first guide slope connected to the leeward side of the adjacent lower deflector area, and the first guide slope faces the windward side of the adjacent lower deflector area.

[0012] Preferably, the defogging channel outlet area is connected to the adjacent upper deflection area through the second guide area, and the second guide area has a second guide slope that is disposed opposite to the first guide slope.

[0013] Preferably, a first guide vane is provided on the first guide slope, and the first guide vane extends to the leeward side of the adjacent lower deflection zone; a second guide vane is provided on the windward side of the adjacent lower deflection zone, and the second guide vane extends to the leeward side of the adjacent upper deflection zone; a third guide vane is provided on the windward side of the adjacent upper deflection zone, and the third guide vane extends to the second guide slope.

[0014] Preferably, the first guide vane, the second guide vane, and the third guide vane are provided with deflectors at both the upper and lower ends, the first collecting groove is formed by a lower bending portion, and the second collecting groove is formed by an upper bending portion.

[0015] Preferably, the first, second, third, and fourth gas-liquid separators all have the same liquid collecting plate structure; multiple liquid collecting blades are vertically spaced inside the liquid collecting plate, and airflow passes between adjacent liquid collecting blades. Each liquid collecting blade includes a U-shaped liquid collecting part and a liquid guiding part that extends upwardly from one side of the U-shaped liquid collecting part; on the vertically downward projection plane, the liquid guiding part of the adjacent right liquid collecting blade at least partially covers the U-shaped liquid collecting part of the adjacent left liquid collecting blade.

[0016] Preferably, the upper end of the liquid guiding part is bent to form a bent part, and the bent part forms two relatively distributed liquid guiding slopes at the upper end of the liquid guiding part.

[0017] Preferably, the liquid collecting tray is further provided with a porous air guide plate located above the liquid collecting blade, and the porous air guide plate is provided with multiple umbrella-shaped air outlet pipes, the multiple umbrella-shaped air outlet pipes accounting for 40%-60% of the number of through holes of the porous air guide plate.

[0018] Preferably, the liquid distributor includes: A primary liquid tank with multiple primary liquid holes; A secondary liquid tank is disposed below the primary liquid tank and communicates with at least one of the primary liquid holes. An overflow hole is provided at its end and multiple secondary liquid holes are provided on its outer side. A liquid guiding toothed plate is disposed below the secondary liquid tank, and has toothed grooves on it to guide the liquid flow from the primary liquid hole and the secondary liquid hole to be distributed in a preset direction; An overflow channel is connected to the overflow hole; The primary liquid tank and the secondary liquid tank are arranged perpendicularly and symmetrically distributed into two groups. The overflow tank is arranged between the two groups of primary and secondary liquid tanks. Two symmetrically distributed liquid guiding slopes are provided at the lower end of the secondary liquid tank. The secondary liquid hole is perpendicularly connected to the liquid guiding slope so that the liquid flowing out of the secondary liquid hole flows into the liquid guiding tooth plate at a certain angle.

[0019] Preferably, the ozone mixing device includes a gas guide plate and a plurality of mixing gas guide pipes fixed through the gas guide plate. The mixing gas guide pipes are internally provided with an ozone branch pipe communicating with the inner cavity of the gas guide plate, and a mixing component arranged above the ozone branch pipe. The ozone branch pipe has an outlet extending to the central axis of the mixing gas guide pipe, the upper end of the outlet is closed, and a plurality of outlet holes are uniformly opened on its peripheral wall. The mixing component includes a dynamic mixing element and a static mixing element arranged sequentially from bottom to top. The static mixing element includes at least two spiral mixing blades connected in an axially staggered manner, with adjacent spiral mixing blades staggered at an angle of 90°. The dynamic mixing element includes two sets of coaxially connected pneumatic rotating disks, with inclined mixing blades of opposite inclination directions correspondingly arranged in the two sets of pneumatic rotating disks.

[0020] Compared with the prior art, the present invention has the following advantages: (1) The flue gas pollutant integrated purification tower provided by the present invention integrates cooling and dust removal, amine liquid desulfurization, ozone oxidation denitrification, flue gas demisting, and flue gas whitening treatment into one unit, which can fully realize the removal of pollutants such as dust, SO2, nitrogen oxides, and heavy metals in flue gas.

[0021] (2) The demister set in this invention removes mist droplets from the airflow by means of deflection, and a first collecting groove is added at the lower end of the windward side of the deflection zone and a second collecting groove is added at the lower end of the leeward side. On the one hand, it improves the separation and aggregation efficiency of mist droplets, and on the other hand, it realizes the rapid guidance of the aggregated mist droplets.

[0022] (3) The demister of the present invention is further provided with a first guide slope and a second guide slope that cooperate with the windward side, so that the airflow carrying the mist droplets can flow at an angle to the windward side, thereby enhancing the capture effect of the mist droplets on the windward side and reducing the phenomenon of secondary entrainment of mist droplets; at the same time, the first guide slope and the second guide slope can also form a certain degree of capture of the mist droplets, thereby further improving the demisting effect.

[0023] (4) The demister provided in this invention forms a flow collection groove by adding guide vanes to the demister blades, which has the advantages of simple structure, convenient assembly and easy maintenance.

[0024] (5) The gas-liquid separator provided in this invention includes a liquid collection part and a gas guiding part, thereby further improving the contact between the airflow and the spray liquid, thereby improving the flue gas treatment effect.

[0025] (6) The liquid distributor provided in this invention adopts a multi-level distribution structure to improve the uniformity of liquid distribution, thereby making the gas-liquid contact more sufficient. At the same time, by optimizing the cooperation of the multi-level distribution structure, the overall anti-clogging performance of the liquid distributor is improved and the service life of the liquid distributor is extended.

[0026] (7) The ozone mixing device provided in this invention uses a mixing component to improve the mixing effect of flue gas and ozone. The mixing component includes a static mixing component and a dynamic mixing component to achieve dual mixing of flue gas and ozone. The dynamic mixing component is set to a bidirectional rotating configuration to ensure sufficient and uniform mixing turbulence. Attached Figure Description

[0027] Figure 1 This is a perspective view of the appearance of the present invention; Figure 2 This is a perspective view of the internal structure of the present invention; Figure 3 This is a schematic diagram of the demister structure in this invention; Figure 4 This is a schematic diagram of the structure of adjacent demisting blades in this invention; Figure 5 This is a schematic diagram of the gas-liquid separator in this invention; Figure 6 This is a schematic diagram of the structure of adjacent liquid collecting blades in this invention; Figure 7 This is one of the structural schematic diagrams of the liquid distributor in this invention; Figure 8 This is the second schematic diagram of the liquid distributor in this invention; Figure 9 This is a schematic diagram of the structure of the secondary liquid tank and the overflow tank in this invention; Figure 10 This is a schematic diagram of the ozone mixing device in this invention; Figure 11 This is a schematic diagram of the internal structure of the mixed-flow air guide tube in this invention; In the picture: Rectifier-1; First spray mechanism-2; First demister-3; First gas-liquid separator-4; Packing layer-5; Liquid distributor-6; Second gas-liquid separator-7; Second spray mechanism-8; Second demister-9; Ozone mixing device-10; Fourth gas-liquid separator-11; Fourth spray mechanism-12; Third gas-liquid separator-13; Third spray mechanism-14; Third demister-15; Magnetic energy whitening device-16; Frame-101; Demisting blade-102; Demisting channel-103; First flow collector-104; Second flow collector-105; First guide slope-106; Second guide slope-107; First guide blade-108; Second guide blade-109; Third guide blade-110; Liquid collecting tray-201; Liquid collecting blade-202; U-shaped liquid collecting part-203; Liquid guiding part-204; Bending part-205; Porous air guiding tray-206; Umbrella-shaped air outlet pipe-207; Primary liquid tank - 301; Secondary liquid tank - 302; Guide toothed plate - 303; Overflow tank - 304; Guide slope - 305; Air guide plate-401; Inclined mixing blade-402; Mixing air guide pipe-403; Ozone branch pipe-404; Spiral mixing blade-405; Pneumatic rotary plate-406. Detailed Implementation

[0028] To further understand the content of this invention, a detailed description of the invention is provided in conjunction with the accompanying drawings and embodiments. The structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art, and are not intended to limit the implementation conditions of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein.

[0029] like Figure 1 and Figure 2 As shown, the integrated flue gas pollutant purification tower proposed in this invention includes a tower body and, from bottom to top, a first water washing section I, a desulfurization treatment section II, a second water washing section III, a denitrification treatment section IV, a third water washing section V, and a whitening treatment section VI disposed inside the tower body. Specifically, the tower body has a flue gas inlet A at the bottom and a purified flue gas outlet B at the top. After the flue gas enters the tower body through inlet A, the first water washing section I cools the flue gas through spray washing, while simultaneously removing dust, some heavy metals, HF, HCl, SO3, and some SO2. The desulfurization treatment section II uses amine absorption for desulfurization. The second water washing section III is used to wash away unreacted amine in the flue gas. The denitrification treatment section IV uses ozone oxidation for denitrification. The third water washing section V is used to wash away unreacted alkali during the denitrification process. The whitening treatment section VI removes fine droplets, aerosols, soluble salts, and condensable particles from the flue gas through conditioning magnetic fields, pulsed magnetic fields, and induced magnetic fields, thereby reducing white plumes in the emitted flue gas and achieving ultra-clean emissions through outlet B.

[0030] In one example, the first water washing section I includes a rectifier 1, a first spray mechanism 2, and a first demister 3. The rectifier 1 has multiple regularly distributed small holes. The first spray mechanism 2 sprays condensate onto the rectifier 1, thereby forming a liquid film on the upper surface of the rectifier 1. Flue gas passes through the liquid film at the small holes, and pollutants are absorbed by the liquid film and fall to the bottom of the tower through the small holes. The sprayed flue gas then undergoes demisting treatment by the first demister 3 to reduce the moisture content in the flue gas. This structural design effectively increases the mass and heat transfer area, thereby achieving flue gas cooling and simultaneously achieving dust removal, removal of some heavy metals, HF, HCl, SO3, and some SO2.

[0031] It should be noted that an anti-wall flow ring is also provided between the rectifier 1 and the first spray mechanism 2. This anti-wall flow ring is made of corrosion-resistant metal material, with a width of 50-120mm, and its outer circumference is directly fixed to the inner wall of the tower. This allows the liquid and gas flowing along the tower wall to be guided into the tower, thereby reducing the unevenness caused by gas and liquid wall flow.

[0032] In one example, the desulfurization treatment section II includes a first gas-liquid separator 4, a packing layer 5, and a liquid distributor 6. The first gas-liquid separator 4 is used to collect excess amine liquid discharged from the liquid distributor 6, while allowing the flue gas after demisting in the first water washing section I to enter the desulfurization treatment section II; the liquid distributor 6 ensures that the amine liquid is evenly distributed within the packing layer 5, and the flue gas forms a counter-current contact with the amine liquid in the packing layer 5, thereby achieving the desulfurization effect.

[0033] In one example, the second water washing section III includes a second gas-liquid separator 7, a second spray mechanism 8, and a second demister 9; wherein the second gas-liquid separator 7 is used to collect excess spray liquid discharged from the second spray mechanism 8, while allowing the desulfurized flue gas in the desulfurization treatment section II to enter the second water washing section III; the second demister 9 has the same function as the first demister 3, and is used to reduce the moisture carried in the flue gas through demisting treatment.

[0034] In one example, the denitrification treatment section IV includes an ozone mixing device 10, a fourth gas-liquid separator 11, and a fourth spraying mechanism 12. The ozone mixing device 10 provides an ozone source to the denitrification treatment section IV and simultaneously achieves thorough mixing of ozone and flue gas. Ozone has strong oxidizing properties and can oxidize low-valence NOx in the flue gas to high-valence NOx. At the same time, gaseous mercury in the flue gas is also oxidized by ozone to Hg2+ compounds. The fourth gas-liquid separator 11 collects excess alkaline solution discharged from the fourth spraying mechanism 12 while allowing the ozone-flue gas mixture to pass through. Under the spraying action of the fourth spraying mechanism 12, the mixed gas comes into full contact with the alkaline solution, thereby allowing the high-valence NOx and Hg2+ compounds to be fully absorbed by the alkaline solution, generating nitrate and mercury compound precipitates.

[0035] In one example, the third water washing section V includes a third gas-liquid separator 13, a third spray mechanism 14, and a third demister 15; wherein the third gas-liquid separator 13 is used to collect excess spray liquid discharged by the third spray mechanism 14, while allowing flue gas from the denitrification treatment section IV to enter the third water washing section V; the third demister 15 has the same function as the first demister 3, and is used to reduce the moisture carried in the flue gas through demisting treatment.

[0036] In one example, the whitening treatment section VI includes a magnetic whitening device 16. The magnetic whitening device 16, from bottom to top, consists of a conditioning magnetic field zone, a lower gas chamber, a pulsed magnetic field zone, an upper gas chamber, and an induction magnetic field zone. Based on this, after the flue gas passes through the conditioning magnetic field, pulsed magnetic field, and induction magnetic field in the magnetic whitening device 16, fine droplets, aerosols, soluble salts, and condensable particles in the flue gas are effectively removed, reducing the white plume in the emitted flue gas and thus achieving ultra-clean emissions.

[0037] This application makes the following improvements to the aforementioned integrated flue gas pollutant purification tower: One of the improvements is: refer to Figure 3 and Figure 4 As shown, the first demister 3, the second demister 9, and the third demister 15 have the same structure, each including a frame 101 and a plurality of demister blades 102 vertically spaced within the frame 101. A demister channel 103 is formed between adjacent demister blades 102 to allow airflow to flow upward. The demister channel 103 includes an inlet area, at least two deflection areas, and an outlet area. The deflection directions of adjacent deflection areas are opposite. Each deflection area includes a windward side and a leeward side. A first collecting groove 104 is provided at the lower end of the windward side, and a second collecting groove 105 is provided at the lower end of the leeward side.

[0038] For example, the demisting blades 102 are placed vertically, allowing the droplets to fall from the demisting channel 103 under the action of gravity, thereby completing the separation of droplets from flue gas. The demisting channel 103 has at least two deflection zones, so that the flue gas will accumulate due to its impact with the demisting blades 102 when passing through the demisting channel 103. The first collecting groove 104 improves the accumulation efficiency of droplets on the windward side, and the second collecting groove 105 is used to receive droplets that slide down from the windward side to the leeward side, thereby realizing the rapid guidance of the accumulated droplets to avoid the phenomenon of secondary entrainment of mist.

[0039] In this example, the inlet area of ​​the defogging channel 103 is connected to the adjacent lower deflector area via a first guide area. The first guide area has a first guide slope 106 connected to the leeward side of the adjacent lower deflector area, and the first guide slope 106 faces the windward side of the adjacent lower deflector area. The outlet area of ​​the defogging channel 103 is connected to the adjacent upper deflector area via a second guide area. The second guide area has a second guide slope 107 opposite to the first guide slope 106. The first guide slope 106 guides the flue gas, causing the flue gas carrying mist droplets to flow obliquely towards the windward side, thereby enhancing the mist droplet capture effect on the windward side. Simultaneously, the first guide slope 106 and the second guide slope 107 also capture mist droplets to a certain extent, further improving the defogging effect.

[0040] In this example, a first guide vane 108 is provided on the first guide slope 106, extending towards the leeward side of the adjacent lower deflection zone; a second guide vane 109 is provided on the windward side of the adjacent lower deflection zone, extending towards the leeward side of the adjacent upper deflection zone; and a third guide vane 110 is provided on the windward side of the adjacent upper deflection zone, extending towards the second guide slope 107. Specifically, deflection portions are provided at both the upper and lower ends of the first guide vane 108, the second guide vane 109, and the third guide vane 110. The first collecting groove 104 is formed by a lower bending portion, and the second collecting groove 105 is formed by an upper bending portion, thereby increasing the flow rate of flue gas entering the first collecting groove 104, so that the mist droplets in the flue gas are collected in the first collecting groove 104 as much as possible, thereby improving the demisting efficiency of the demister. Furthermore, by adding guide vanes to the demister blades 102, the above-mentioned structural optimization has the advantages of simple structure, convenient assembly, and easy maintenance. It can also improve the structural strength of the demister blades 102, thereby extending the service life of the demister.

[0041] The second improvement lies in: refer to Figure 5 and Figure 6As shown, the first gas-liquid separator 4, the second gas-liquid separator 7, the third gas-liquid separator 13, and the fourth gas-liquid separator 11 all have a liquid collecting plate 201 with the same structure. Multiple liquid collecting blades 202 are vertically spaced inside the liquid collecting plate 201, and a porous air guiding plate 206 is located above the multiple liquid collecting blades 202. Specifically, the airflow passes between adjacent liquid collecting blades 202 and then exits upward through multiple umbrella-shaped air outlet pipes 207 installed on the porous air guiding plate 206. The multiple umbrella-shaped air outlet pipes 207 account for 40%-60% of the number of through holes in the porous air guiding plate 206, thereby enabling gas-liquid separation and flow of flue gas on the porous air guiding plate 206.

[0042] In this embodiment, the liquid collecting blade 202 includes a U-shaped liquid collecting section 203 and a liquid guiding section 204 extending upwardly at an angle from one side of the U-shaped liquid collecting section 203. On a vertically downward projection plane, the liquid guiding section 204 of the adjacent right-side liquid collecting blade 202 at least partially covers the U-shaped liquid collecting section 203 of the adjacent left-side liquid collecting blade 202. Based on this, when liquid falling from top to bottom contacts the upper end of the liquid guiding section 204, the liquid flow can be guided along the inclined surface of the liquid guiding section 204 into the U-shaped liquid collecting section 203, thereby preventing the liquid flow from flowing out from the gap between adjacent liquid collecting blades 202. Simultaneously, it ensures that flue gas can pass through the gap between adjacent liquid collecting blades 202, thus effectively achieving the dual functions of liquid collection and gas diversion. Furthermore, the flue gas and liquid flow can further contact within the gap between adjacent liquid collecting blades 202, thereby further improving the sufficiency of contact between the flue gas and the spray liquid, and thus improving the flue gas treatment effect. The liquid collected by the U-shaped liquid collecting section 203 can be transported to the outside of the tower body for further processing through the liquid collecting chamber in the liquid collecting tray 201.

[0043] It is worth noting that the upper end of the liquid guiding part 204 is bent to form a bent part 205, and the bent part 205 forms two relatively distributed liquid guiding slopes at the upper end of the liquid guiding part 204. Thus, when the liquid falling from top to bottom comes into contact with the bent part 205 at the upper end of the liquid guiding part 204, the liquid flow can be split to the left and right sides, and fall into the adjacent U-shaped liquid collecting parts 203, further improving the liquid collecting effect of the gas-liquid separator.

[0044] The third improvement lies in: refer to Figures 7-9 As shown, the liquid distributor 6 includes: A primary liquid tank 301 is provided with multiple primary liquid holes; A secondary liquid tank 302 is disposed below the primary liquid tank 301 and is in communication with at least one of the primary liquid holes. An overflow hole is provided at its end and multiple secondary liquid holes are provided on its outer side. The liquid guiding toothed plate 303 is disposed below the secondary liquid tank 302, and has toothed grooves on it to guide the liquid flow from the primary liquid hole and the secondary liquid hole to be distributed in a preset direction; Overflow groove 304 is connected to the overflow hole; The primary liquid tank 301 and the secondary liquid tank 302 are arranged perpendicularly and symmetrically distributed into two groups. The overflow tank 330 is arranged between the two groups of primary liquid tanks 301 and secondary liquid tanks 302. Two symmetrically distributed liquid guiding slopes 305 are provided at the lower end of the secondary liquid tank 302. The secondary liquid hole vertically penetrates the liquid guiding slope 305 so that the liquid flowing out of the secondary liquid hole flows at a certain angle to the liquid guiding tooth plate 303.

[0045] Specifically, the primary liquid tank 301 is connected to an external liquid supply device to transport the amine liquid used for desulfurization treatment into the primary liquid tank 301. Multiple primary liquid holes (not shown in the figure) are provided on the side and bottom of the primary liquid tank 301 to realize the drainage and overflow of the primary liquid tank 301. The secondary liquid tank 302 is fixed to the bottom of the primary liquid tank 301 perpendicularly to it and communicates with some of the primary liquid holes. This allows some of the amine liquid discharged from the primary liquid tank 301 to enter the secondary liquid tank 302. Two symmetrically distributed liquid guiding slopes 305 are provided at the lower end of the secondary liquid tank 302. Each liquid guiding slope 305 has multiple secondary liquid holes vertically arranged, allowing the amine liquid in the secondary liquid tank 302 to be discharged through the secondary liquid holes. Two liquid guiding teeth 303 are symmetrically arranged at the bottom of one secondary liquid tank 302, so that the cone formed by the two liquid guiding slopes 305 at the bottom of the secondary liquid tank 302 extends between the two liquid guiding teeth 303. This ensures that the liquid flowing out of the secondary liquid holes can flow to the liquid guiding teeth 303 at a certain angle. With the cooperation of the teeth and grooves on the liquid guiding teeth 303, the amine liquid is evenly distributed in the packing layer 5, thereby making the gas-liquid contact more sufficient and improving the desulfurization effect. Meanwhile, by optimizing the multi-level distribution structure, the primary liquid tank 301 and the secondary liquid tank 302 are symmetrically distributed into two groups, and an overflow tank 330 is connected between the two groups of primary liquid tank 301 and secondary liquid tank 302, thereby improving the overall anti-clogging performance of the liquid distributor and extending the service life of the liquid distributor.

[0046] The fourth improvement lies in: refer to Figure 10 and Figure 11As shown, the ozone mixing device 10 includes a gas guide plate 401 and a plurality of mixing gas guide pipes 403 that pass through and are fixed on the gas guide plate 401. The mixing gas guide pipes 403 are provided with an ozone branch pipe 404 that communicates with the inner cavity of the gas guide plate 401 and a mixing component arranged above the ozone branch pipe 404. The ozone branch pipe 404 has an outlet portion extending to the central axis of the mixing gas guide pipe 403, and a plurality of outlet holes are uniformly opened on the peripheral wall of the outlet portion. The mixing component includes a dynamic mixing component and a static mixing component arranged sequentially from bottom to top. The static mixing component includes at least two spiral mixing blades 405 that are staggered along the axial direction, and the stagger angle of adjacent spiral mixing blades 405 is 90°. The dynamic mixing component includes two sets of coaxially connected pneumatic rotating disks 406, and inclined mixing blades 402 with opposite inclination directions are correspondingly arranged in the two sets of pneumatic rotating disks 406.

[0047] Specifically, the air guide plate 401 is fixed to the lower part of the mixed flow air guide pipe 403, which on the one hand ensures the stability of the mixed flow air guide pipe 403 installation, and on the other hand allows ozone to be guided in from the lower part of the mixed flow air guide pipe 403. The bottom of the mixed-flow duct 403 penetrates the duct plate 401, allowing the flue gas from the second water washing section III to enter the mixed-flow duct 403 from bottom to top. Simultaneously, the duct plate 401 is connected to an external ozone generator to supply ozone into the inner cavity of the duct plate 401. An ozone branch pipe 404 installed at the lower part of the mixed-flow duct 403 communicates with the inner cavity of the duct plate 401, meaning ozone can enter the mixed-flow duct 403 through the ozone branch pipe 404. It should be noted that the upper end of the ozone branch pipe 404 is closed, and multiple outlet holes with a diameter of 4-12 mm are evenly opened on its peripheral wall, thus forming a radial air intake. That is, ozone can be evenly introduced into the mixed-flow duct 403 through multiple radially connected outlet holes. Ozone and flue gas come into contact at the lower part of the mixing duct 403, and then flow together to the upper mixing component. Dynamic mixing is first achieved through two sets of pneumatic rotating disks 406, each equipped with inclined mixing blades 402 at an angle of 30-60°. This allows the pneumatic rotating disks 406 to rotate under the influence of the mixed airflow of flue gas and ozone. It should be noted that the inclined mixing blades 402 in the two sets of pneumatic rotating disks 406 are tilted in opposite directions, effectively achieving opposite rotation of the two sets of pneumatic rotating disks 406 and thus improving the dynamic mixing effect. Static mixing is then achieved through the guidance of at least two spiral mixing blades 405, with adjacent spiral mixing blades 405 staggered by 90° to enhance the static mixing effect.

[0048] In summary, the ozone mixing device 10 achieves both static and dynamic mixing of flue gas and ozone, and the dynamic mixing element is configured with a bidirectional rotating structure to ensure sufficient and uniform mixing turbulence, thereby improving the oxidation effect of ozone on low-valence NOx and gaseous mercury in flue gas.

[0049] In the description of this invention, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An integrated purification tower for flue gas pollutants, characterized in that, include: The first water washing section I includes a rectifier (1), a first spraying mechanism (2), and a first demister (3); The desulfurization treatment section II is located above the first water washing section I and includes a first gas-liquid separator (4), a packing layer (5), and a liquid distributor (6). The second water washing section III is located above the desulfurization treatment section II and includes a second gas-liquid separator (7), a second spraying mechanism (8), and a second demister (9). The denitrification treatment section IV is located above the second water washing section III and includes an ozone mixing device (10), a fourth gas-liquid separator (11), and a fourth spraying mechanism (12). The third water washing section V is located above the denitrification treatment section IV and includes a third gas-liquid separator (13), a third spraying mechanism (14), and a third demister (15). Whitening treatment section VI is located above the third washing section V and includes a magnetic whitening device (16). The first demister (3), the second demister (9), and the third demister (15) have the same structure, each including a frame (101) and a plurality of demister blades (102) vertically spaced within the frame (101). A demister channel (103) is formed between adjacent demister blades (102) to allow airflow to flow upward. The demister channel (103) includes an inlet area, at least two deflection areas, and an outlet area. The deflection directions of adjacent deflection areas are opposite. Each deflection area includes a windward side and a leeward side. A first collecting groove (104) is provided at the lower end of the windward side, and a second collecting groove (105) is provided at the lower end of the leeward side.

2. The integrated flue gas pollutant purification tower according to claim 1, characterized in that: The entrance area of ​​the defogging channel (103) is connected to the adjacent lower deflector area through the first guide area. The first guide area has a first guide slope (106) connected to the leeward side of the adjacent lower deflector area. The first guide slope (106) faces the windward side of the adjacent lower deflector area.

3. The integrated flue gas pollutant purification tower according to claim 2, characterized in that: The outlet area of ​​the defogging channel (103) is connected to the adjacent upper deflection area through the second guide area. The second guide area has a second guide slope (107) that is arranged opposite to the first guide slope (106).

4. The integrated flue gas pollutant purification tower according to claim 3, characterized in that: A first guide vane (108) is provided on the first guide slope (106), and the first guide vane (108) extends to the leeward side of the adjacent lower deflection zone; A second guide vane (109) is provided on the windward side of the adjacent lower deflector zone, and the second guide vane (109) extends to the leeward side of the adjacent upper deflector zone; A third guide vane (110) is provided on the windward side of the adjacent upper deflection zone, and the third guide vane (110) extends toward the second guide slope (107).

5. The integrated flue gas pollutant purification tower according to claim 4, characterized in that: The first guide vane (108), the second guide vane (109) and the third guide vane (110) are provided with deflection portions at both ends. The first collecting groove (104) is formed by a lower bending portion, and the second collecting groove (105) is formed by an upper bending portion.

6. The integrated flue gas pollutant purification tower according to claim 1, characterized in that: The first gas-liquid separator (4), the second gas-liquid separator (7), the third gas-liquid separator (13), and the fourth gas-liquid separator (11) all have the same liquid collection plate (201); the liquid collection plate (201) is vertically spaced with multiple liquid collection blades (202), and the airflow passes between adjacent liquid collection blades (202). The liquid collection blade (202) includes a U-shaped liquid collection part (203) and a liquid guiding part (204) extending upwardly from one side of the U-shaped liquid collection part (203); on the vertically downward projection plane, the liquid guiding part (204) of the adjacent right liquid collection blade (202) at least partially covers the U-shaped liquid collection part (203) of the adjacent left liquid collection blade (202).

7. The integrated flue gas pollutant purification tower according to claim 6, characterized in that: The upper end of the liquid guiding part (204) is bent to form a bent part (205), and the bent part (205) forms two relatively distributed liquid guiding slopes at the upper end of the liquid guiding part (204).

8. The integrated flue gas pollutant purification tower according to claim 6, characterized in that: The liquid collecting plate (201) is also provided with a porous air guide plate (206) located above the liquid collecting blade (202). The porous air guide plate (206) is provided with multiple umbrella-shaped air outlet pipes (207), and the multiple umbrella-shaped air outlet pipes (207) account for 40%-60% of the number of through holes of the porous air guide plate (206).

9. The integrated flue gas pollutant purification tower according to claim 1, characterized in that: The liquid distributor (6) includes: A primary liquid tank (301) is provided with multiple primary liquid holes; A secondary liquid tank (302) is disposed below the primary liquid tank (301) and is in communication with at least one of the primary liquid holes. An overflow hole is provided at its end and multiple secondary liquid holes are provided on its outer side. A liquid guiding toothed plate (303) is disposed below the secondary liquid tank (302), and has toothed grooves on it to guide the liquid flow from the primary liquid hole and the secondary liquid hole to be distributed in a preset direction; Overflow groove (304) is connected to the overflow hole; The primary liquid tank (301) and the secondary liquid tank (302) are arranged perpendicularly, and the primary liquid tank (301) and the secondary liquid tank (302) are symmetrically distributed into two groups. The overflow tank (330) is arranged between the two groups of primary liquid tanks (301) and secondary liquid tanks (302). Two symmetrically distributed liquid guiding slopes (305) are provided at the lower end of the secondary liquid tank (302). The secondary liquid hole vertically penetrates the liquid guiding slope (305) so that the liquid flowing out of the secondary liquid hole flows at a certain angle to the liquid guiding tooth plate (303).

10. The integrated flue gas pollutant purification tower according to claim 1, characterized in that: The ozone mixing device (10) includes a gas guide plate (401) and a plurality of mixing gas guide pipes (403) that pass through and are fixed on the gas guide plate (401). An ozone branch pipe (404) communicating with the inner cavity of the gas guide plate (401) is provided in the mixing gas guide pipe (403), and a mixing component is arranged above the ozone branch pipe (404). The ozone branch pipe (404) has an outlet extending to the central axis of the mixing gas guide pipe (403), and the upper end of the outlet is closed. The peripheral wall is uniformly provided with multiple air outlet holes; the mixing component includes a dynamic mixing component and a static mixing component arranged sequentially from bottom to top; the static mixing component includes at least two spiral mixing blades (405) that are staggered along the axial direction, and the staggered angle of adjacent spiral mixing blades (405) is 90°; the dynamic mixing component includes two sets of coaxially connected pneumatic rotating disks (406), and the two sets of pneumatic rotating disks (406) are respectively provided with inclined mixing blades (402) with opposite inclination directions.

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