Flushing device for flue gas desulfurization system and flue gas desulfurization system

Abstract

The utility model provides a kind of flushing device and flue gas desulfurization system for flue gas desulfurization system.The flushing device is configured below the component to be flushed in desulfurization chamber, to water spray flushing to the component to be flushed, and the flushing device includes liquid passage for liquid to pass into and multiple self-rotating nozzles connected with liquid passage.The self-rotating nozzle includes: connecting seat, connected to liquid passage, connecting seat is equipped with connecting channel in, connecting channel has liquid inlet connected with liquid passage and liquid outlet for discharging liquid;And rotating disc, rotatably configured above liquid outlet, rotating disc side towards liquid outlet is provided with turbine part and dispersing part around turbine part outer periphery.Wherein, liquid outlet is located in the coverage range of turbine part, so that the water flow sprayed by liquid outlet impacts turbine part to drive turbine part to rotate, and the water flow spun out by turbine part is cut and dispersed by dispersing part and sprayed.The flushing device is simple in structure, self-driven, high in flushing efficiency and uniform in coverage.

Description

Technical Field

[0001] This utility model relates to the field of flue gas desulfurization technology, and in particular to a flushing device and a flue gas desulfurization system for flue gas desulfurization systems. Background Technology

[0002] Currently, the two most mature flue gas desulfurization technologies used in the electrolytic aluminum industry are traditional limestone-gypsum wet desulfurization and calcium hydroxide semi-dry desulfurization. Wet desulfurization is the mainstream technology in the electrolytic aluminum industry. In wet desulfurization systems, surfaces such as demisters and spray layer components in the desulfurization chamber are prone to reduced efficiency or even malfunction due to slurry or dust accumulation, thus requiring regular cleaning via flushing devices. Existing technologies commonly use fixed nozzles or externally driven rotating nozzles for flushing. Fixed nozzles, which are stationary and achieve flushing through static water jets, suffer from limited flushing range, uneven coverage, and the potential to create dead zones on component surfaces, leading to residue buildup. Externally driven rotating nozzles rely on external power sources such as motors to rotate the nozzles. While this expands the flushing range, it increases system complexity and maintenance costs, and the power components are prone to failure due to prolonged exposure to high humidity and corrosive environments. Furthermore, traditional nozzles often use concentrated spraying or simple atomization, resulting in poor flushing effectiveness.

[0003] Therefore, it is necessary to propose a new technical solution to overcome the problems existing in the current technology. Utility Model Content

[0004] This utility model provides a flushing device and a flue gas desulfurization system for use in flue gas desulfurization systems. The system has a simple structure, is self-driven, has high flushing efficiency, and provides uniform coverage.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a flushing device for a flue gas desulfurization system, configured below the component to be flushed within the desulfurization chamber, for spraying water to flush the component. The flushing device includes a liquid channel for liquid inflow and multiple self-rotating nozzles communicating with the liquid channel. The self-rotating nozzles include:

[0006] A connecting base, connected to the liquid channel, the connecting base having a connecting channel, the connecting channel having an inlet communicating with the liquid channel and an outlet for discharging liquid; and

[0007] A rotating disk is rotatably disposed above the liquid outlet, and a turbine part and a dispersion part surrounding the outer periphery of the turbine part are provided on the side of the rotating disk facing the liquid outlet.

[0008] The outlet is located within the coverage area of ​​the turbine, so that the water jet from the outlet impacts the turbine to drive it to rotate, and the water jet thrown out by the rotating turbine is cut and dispersed by the dispersion section before being sprayed out.

[0009] Optionally, the turbine section includes a plurality of arc-shaped protrusions extending outward in a cyclone pattern from the center of the turbine section.

[0010] Optionally, a rotating water flow channel is formed between two adjacent arc-shaped protrusions, and the rotating water flow channel is gradually widened from the center of the turbine to the outer periphery.

[0011] Optionally, the dispersion section includes multiple partitions, with water outlet channels formed between adjacent partitions for water flow.

[0012] Optionally, each of the partitions extends radially along the rotating disk.

[0013] Optionally, the number of water outlet channels is greater than the number of rotating water flow channels.

[0014] Optionally, the location of the water outlet channel is higher than the location of the rotating water flow channel.

[0015] Optionally, the connecting channel has a tapered section, which is tapered in diameter in the direction from the inlet to the outlet.

[0016] Optionally, the connecting channel is provided with a support rib connected to the inner wall of the connecting channel, and the support rib is provided with a rotating shaft extending along the axial direction of the connecting channel, and the rotating disk is connected to the rotating shaft.

[0017] This utility model also adopts the following technical solution: a flue gas desulfurization system, including a desulfurization chamber, wherein the desulfurization chamber is equipped with: a spraying device for spraying desulfurization slurry; a gas-liquid dispersion plate, disposed below the spraying device, for dispersing the desulfurization slurry and flue gas to promote their mixing; and a demisting device, disposed above the spraying device, for removing water mist from the flue gas flowing through it to disperse the desulfurization slurry and flue gas to promote their mixing; wherein the flue gas desulfurization system includes a flushing device as described above, the flushing device being disposed below the demisting device for flushing the demisting device.

[0018] The flushing device for a flue gas desulfurization system provided by this utility model includes multiple self-rotating nozzles. Each self-rotating nozzle includes a connecting seat and a rotating disk. The connecting seat is connected to a liquid channel and has a connecting channel with an inlet for communicating with the liquid channel and an outlet for discharging liquid. The rotating disk is rotatably arranged above the outlet. A turbine and a dispersing section are arranged on the side of the rotating disk facing the outlet. The outlet is located within the coverage area of ​​the turbine, so that the water flow sprayed from the outlet impacts the turbine to drive it to rotate. The water flow thrown out by the rotating turbine is cut and dispersed by the dispersing section before being sprayed out. This achieves automatic rotation of the rotating disk by water flow impacting the turbine, eliminating the need for an external power source such as a motor, simplifying the system structure, reducing maintenance costs, and is especially suitable for high humidity and corrosive environments. Moreover, the rotating water flow channel of the turbine enables the rotating liquid to be thrown out, and the separator of the dispersing section further cuts the water flow, forming multiple fine streams, which can expand the flushing range. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0020] Figure 1 This is a schematic diagram of an embodiment of the flue gas desulfurization system of this utility model.

[0021] Figure 2 This is a three-dimensional view of the self-rotating nozzle in one embodiment of the flushing device of this utility model.

[0022] Figure 3 This is a three-dimensional composite view of the self-rotating nozzle from another perspective in one embodiment of the flushing device of this utility model.

[0023] Figure 4 This is a three-dimensional exploded view of a self-rotating nozzle in one embodiment of the flushing device of this utility model.

[0024] Figure 5 This is a three-dimensional exploded view of the self-rotating nozzle from another perspective in one embodiment of the flushing device of this utility model.

[0025] Figure 6 This is a plan view of the gas-liquid dispersion plate in one embodiment of the flue gas desulfurization system of this utility model.

[0026] Figure 7 This is a partial perspective view of the gas-liquid dispersion plate in one embodiment of the flue gas desulfurization system of this utility model.

[0027] Figure 8 This is a partial side view of the gas-liquid dispersion holes of the gas-liquid dispersion plate in one embodiment of the flue gas desulfurization system of this utility model.

[0028] Figure 9 This is a partial side view of the demister device in one embodiment of the flue gas desulfurization system of this utility model.

[0029] Figure reference numerals: 10. Desulfurization chamber; 101. Flue gas flow channel; 1. Temperature and humidity control device; 2. Gas-liquid dispersion plate; 201. Baffle plate; 202. Gas-liquid dispersion hole; 21. High flue gas resistance section; 22. Medium flue gas resistance section; 23. Low flue gas resistance section; 211. Gas-liquid dispersion unit; 3. Spray device; 4. Washing device; 41. Liquid channel; 42. Self-rotating nozzle; 43. Connecting seat; 430. Connecting channel; 4301. Liquid inlet; 4302. Liquid outlet. 431. Threaded cylinder section; 432. Conical section; 433. Rotating shaft; 434. Support rib; 44. Rotating disk; 441. Turbine section; 4410. Rotating water flow channel; 4411. Arc-shaped protrusion; 442. Dispersion section; 4420. Water outlet channel; 4421. Separator; 5. Demisting device; 51. Baffle plate; 510. Tortuous channel; 511. Airflow hole; 512. Turbulence protrusion; 6. Desulfurization slurry pool; 7. Circulating pump; 8. Liquid replenishment device. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] Unless otherwise defined, the technical or scientific terms used in this patent document shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in this utility model patent specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," etc., mean that the element or object preceding "comprising" or "including" encompasses the element or object listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0035] This utility model relates to a flushing device and a flue gas desulfurization system for flue gas desulfurization. It achieves dynamic flushing without external force by incorporating a self-rotating nozzle, and combined with a structural design for water flow drive and dispersion, effectively solving problems such as dead zones in coverage, power dependence, and complex maintenance inherent in traditional flushing devices. The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0036] like Figure 1As shown, the flue gas desulfurization system provided in this embodiment includes a desulfurization chamber 10. Inside the desulfurization chamber 10, arranged sequentially according to the flue gas flow direction, are a temperature and humidification device 1, a gas-liquid dispersion plate 2, a spray device 3, a flushing device 4, and a demister 5. Flue gas enters from the bottom of the desulfurization chamber 10 and sequentially undergoes temperature and humidification, gas-liquid mixing reaction, spray desulfurization, and demister treatment before being discharged. The flushing device 4 is located below the demister 5 and is used to flush away the slurry or dust deposited on the surface of the demister 5 to prevent clogging and maintain the demister 5's demister efficiency. The flue gas desulfurization system also includes a desulfurization slurry pool 6, a circulation pump 7, and a replenishment device 8 located outside the desulfurization chamber 10 to achieve the recovery and circulation supply of the desulfurization slurry.

[0037] The flushing device 4 is positioned below the component to be flushed within the desulfurization chamber 10, and is used to spray water onto the component. In this embodiment, the component to be flushed is the demister 5. In other embodiments, the component to be flushed may also be a gas-liquid dispersion plate 2, the inner wall of the desulfurization chamber 10, etc. In this embodiment, the flushing device 4 includes a liquid channel 41 for liquid inflow and multiple self-rotating nozzles 42 connected to the liquid channel 41. The liquid channel 41 is positioned below the demister 5 and is arranged laterally along the desulfurization chamber 10. The liquid channel 41 may be multiple pipes or a meandering serpentine pipe, with one end connected to an external water supply system. Multiple self-rotating nozzles 42 are spaced apart and connected to the liquid channel 41 to spray flushing water toward the demister 5.

[0038] Please see Figures 2 to 5 As shown, in this embodiment, the self-rotating nozzle 42 includes two parts: a connecting seat 43 and a rotating disk 44. The connecting seat 43 is used to connect to the liquid channel 41, and has a connecting channel 430 inside. The connecting channel 430 has a liquid inlet 4301 and a liquid outlet 4302. The liquid inlet 4301 communicates with the liquid channel 41, and the liquid outlet 4302 is positioned facing the rotating disk 44. The rotating disk 44 is rotatably disposed above the liquid outlet 4302, and is driven by the water flow sprayed from the connecting channel 430 to achieve automatic rotation, while simultaneously dispersing and spraying the water flow.

[0039] In this embodiment, the connecting seat 43 is a hollow cylindrical shape, and its hollow interior portion constitutes the connecting channel 430. The connecting seat 43 includes a threaded cylindrical section 431 with external threads, which is located close to the liquid inlet 4301 for connection with the internal threads on the liquid channel 41, ensuring a tight seal. The connecting channel 430 has a tapered section 432 in the direction from the liquid inlet 4301 to the liquid outlet 4302. The diameter of the tapered section 432 gradually decreases, causing the water flow to gradually accelerate during flow and enhancing the impact force of the water flow at the liquid outlet 4302.

[0040] The connecting channel 430 is provided with a support rib 434 connected to the inner wall of the connecting channel 430. A rotating shaft 433 extending axially along the connecting channel 430 is provided on the support rib 434, and the rotating disk 44 is connected to the rotating shaft 433. In this embodiment, the support rib 434 includes two ribs, which intersect to form a cross shape, and the rotating shaft 433 is located at the intersection of the cross shape. The rotating shaft 433 is coaxially arranged with the connecting channel 430, and the rotating disk 44 is sleeved on the rotating shaft 433, and the two are rotatably connected.

[0041] Please see Figures 2 to 4 As shown, in this embodiment, the rotating disk 44 is provided with a turbine part 441 and a dispersing part 442 on the side facing the liquid outlet 4302, that is, on the lower surface of the rotating disk 44. The turbine part 441 is located in the central region, and the dispersing part 442 is arranged around the outer periphery of the turbine part 441.

[0042] The turbine section 441 includes multiple arc-shaped protrusions 4411 extending outward in a vortex-like pattern from the center, forming a rotating water flow channel 4410 between adjacent arc-shaped protrusions 4411. The rotating water flow channel 4410 gradually widens from the center of the turbine section 441 outward, that is, the channel is narrower near the center and gradually widens towards the outer periphery. This design causes the water flow to gradually diffuse outward from narrow to wide when impacting the turbine section 441, and the change in channel width generates a pressure gradient, driving the rotating disk 44 to rotate.

[0043] The dispersing section 442 includes a plurality of partition plates 4421, with water outlet channels 4420 formed between adjacent partition plates 4421 for water flow. The partition plates 4421 extend radially along the rotating disk 44. In this embodiment, the number of water outlet channels 4420 is greater than the number of rotating water flow channels 4410, to further cut the water flow ejected through the rotating water flow channels 4410 into more fine water flow streams, thereby increasing the speed and coverage of the final sprayed water flow. In this embodiment, the water outlet channels 4420 are located higher than the rotating water flow channels 4410, which guides the water flow to finally spray out at a position higher than the turbine section 441, thereby improving the rinsing effect on the demisting device 5 located above the rinsing device 4.

[0044] During flushing, flushing water enters the connecting channel 430 of the connecting seat 43 through the liquid channel 41. After being accelerated by the conical section 432, the water is ejected from the outlet 4302, directly impacting the arc-shaped protrusions 4411 of the turbine section 441. Because the arc-shaped protrusions 4411 are arranged in a vortex pattern, the impact of the water generates a tangential force, driving the rotating disk 44 to rotate around the rotating axis 433. During rotation, the water enters the rotating water flow channel 4410. Due to the gradually widening design of the channel, the water speed gradually decreases as it flows outwards, but its rotational kinetic energy increases, eventually being thrown to the dispersion section 442. The separators 4421 of the dispersion section 442 cut the water flow into multiple fine streams, which are then ejected radially from the outlet channel 4420, covering a wider area.

[0045] The flushing device 4 provided by this utility model drives the rotating disk 44 to rotate automatically by the impact of water flow on the turbine part 441. It does not require an external power source such as a motor, which simplifies the system structure and reduces maintenance costs. It is especially suitable for high humidity and corrosive environments. Moreover, the rotating water flow channel 4410 of the turbine part 441 realizes the rotation and throwing of liquid, and the partition plate 4421 of the dispersion part 442 further cuts the water flow to form multiple fine streams, which can expand the flushing range.

[0046] To better understand the flue gas desulfurization system solution provided by this utility model, the other main components included in the flue gas desulfurization system will be described separately below.

[0047] The desulfurization chamber 10 is the core area of ​​the desulfurization reaction, and it is equipped with the gas-liquid dispersion plate 2, spray device 3, flushing device 4, and demister 5. The desulfurization chamber 10 has a flue gas inlet on the left side near the bottom and a flue gas outlet for the purified flue gas to be discharged on the right side near the top. The gas-liquid dispersion plate 2, spray device 3, flushing device 4, and demister 5 are arranged approximately from bottom to top within the desulfurization chamber 10. The desulfurization chamber 10 can be constructed of metal plates, such as stainless steel plates, offering advantages such as no need for regular major overhauls and low maintenance costs. In this embodiment, the desulfurization chamber 10 is horizontal, meaning it has a large lateral dimension and a small longitudinal dimension. Compared to traditional tall, narrow tower-type desulfurization equipment, this reduces the flow rate, increases the reaction time, improves desulfurization efficiency, reduces the liquid-to-gas ratio, reduces the circulating pump head, and reduces energy consumption.

[0048] The temperature and humidification device 1 is located at the flue gas inlet, that is, upstream of the flue gas flow channel 101, and is used to spray water mist onto the flue gas to reduce its temperature and increase its humidity. In this embodiment, the temperature and humidification device 1 is specifically an electromagnetic wave atomizing temperature and humidifier, which uses electromagnetic waves to atomize water. It is located in the area between the inlet of the desulfurization chamber 10 and its interior, about 5-6 meters away, so that the flue gas is cooled and humidified as it flows through this approximately 5-6 meters. Lowering the flue gas temperature by the temperature and humidification device 1 is beneficial for subsequent reactions, avoids scaling, reduces the outlet flue gas temperature, and reduces water consumption. Increasing the flue gas humidity by the temperature and humidification device 1 allows the sulfur dioxide in the flue gas to pre-react with water to generate sulfurous acid, thereby accelerating the subsequent reaction with limestone and increasing the reaction efficiency.

[0049] In this embodiment, the temperature-regulating and humidifying device 1 obtains clean water to generate water mist. The average diameter of the generated water mist is no greater than 30 μm, and preferably between 5 and 20 μm. This fine water mist can evaporate rapidly, absorb heat from the flue gas, reduce the flue gas temperature, and increase the humidity of the flue gas, creating favorable conditions for subsequent desulfurization reactions. It should be further noted that the average diameter of the water mist generated by the temperature-regulating and humidifying device 1 is smaller than the average diameter of the fine droplets dispersed from the desulfurization slurry. In other words, although one of the core aspects of this invention is the dispersion of the desulfurization slurry, the average diameter of the fine droplets dispersed from the desulfurization slurry in this invention is far less than that of the water mist formed by commonly used atomization methods such as electromagnetic atomization. This invention does not use traditional atomization methods to atomize the desulfurization slurry because the dissolved calcium carbonate in the slurry is typically required to be below 200 mesh, i.e., its diameter is approximately 74 μm. If traditional atomization methods are used, droplets with a diameter of approximately 10 μm can be formed. This causes the water in the desulfurization slurry to be atomized, resulting in the separation of dissolved calcium carbonate from the water. Consequently, solid particles (such as calcium carbonate) in the desulfurization slurry are prone to depositing in the atomizer pipes and nozzles, leading to blockages. This necessitates periodic shutdowns for cleaning, affecting continuous production and shortening the atomizer's lifespan. Furthermore, the high viscosity of the slurry and uneven atomization can easily cause equipment malfunctions. After water is atomized, the desulfurizing agent becomes locally concentrated, easily leading to scaling. The desulfurization slurry treated using this embodiment disperses into fine droplets with an average diameter between 70 and 200 μm, preferably between 100 and 200 μm. Droplets within this size range have better mass transfer properties and can fully contact and react with the flue gas.

[0050] Please continue reading. Figure 1As shown, the gas-liquid dispersion plate 2 is located in the middle or lower part of the desulfurization chamber 10, and has a gap between it and the bottom wall of the desulfurization chamber 10, so as to form the flue gas flow channel 101 below the gas-liquid dispersion plate 2. The gas-liquid dispersion plate 2 has a plurality of gas-liquid dispersion holes 202 that penetrate vertically through the gas-liquid dispersion plate 2, so that the flue gas in the flue gas flow channel 101 passes upward through the gas-liquid dispersion plate 2 and flows into the space between the spray device 3 and the gas-liquid dispersion plate 2.

[0051] The spraying device 3 is arranged above the gas-liquid dispersion plate 2 and has a gap between it and the gas-liquid dispersion plate 2. The spraying device 3 is used to spray desulfurization slurry onto the gas-liquid dispersion plate 2. The nozzle design of the spraying device 3 is optimized to ensure that the desulfurization slurry can uniformly cover the surface of the gas-liquid dispersion plate 2. The spraying device 3 adopts a multi-nozzle design, and the arrangement of the nozzles and the spraying intensity are precisely calculated to ensure that the desulfurization slurry can be uniformly sprayed onto all areas of the gas-liquid dispersion plate 2. The desulfurization slurry sprayed from the spraying device 3 is uniformly dispersed into fine droplets by impact with the gas-liquid dispersion plate 2 and the impact of the flue gas passing through the gas-liquid dispersion plate 2.

[0052] In one embodiment, the flushing device 4 is arranged above the spraying device 3. In this embodiment, the flushing device 4 includes several rotating nozzles for flushing the inner wall of the desulfurization chamber 10 and the demister 5. The rotating nozzles of the flushing device 4 are driven to rotate by the liquid sprayed from them, achieving uniform flushing of the inner wall of the desulfurization chamber 10 and the demister 5. This increases the flushing area of ​​each nozzle without increasing energy consumption, reduces the number of nozzles, and optimizes the flushing effect. The flushing water can come from a dedicated flushing water system. Regularly flushing the inner wall of the desulfurization chamber 10 and the demister 5 by the flushing device 4 can remove dust and impurities adhering to their surfaces, keeping the system clean and operating efficiently. The demister 5 is located below the flue gas outlet at the top of the desulfurization chamber 10 to remove dust particles and mist droplets from the purified flue gas. In another embodiment, the flushing device 4 is located below the gas-liquid dispersion plate 2 to flush the gas-liquid dispersion plate 2, removing dust and impurities adhering to the gas-liquid dispersion plate 2, keeping the equipment clean and operating efficiently. The specific composition of the rinsing device 4 has been described above.

[0053] Please refer to the following: Figure 9As shown, the demisting device 5 includes multiple tortuous channels 510 with zigzag flow. These tortuous channels 510 can be S-shaped, <-shaped, etc., from bottom to top. Dust particles and water mist in the flue gas are blocked by these tortuous channels 510, thereby reducing the amount of dust particles and mist droplets in the flue gas discharged from the flue outlet. Further, the demisting device 5 includes multiple spaced-apart baffles 51, with the tortuous channels 510 formed between adjacent baffles 51. Each baffle 51 has a smoke-facing surface and a smoke-repelling surface, and airflow holes 511 penetrating the smoke-facing and smoke-repelling surfaces. In this embodiment, the baffle 51 is <-shaped, including an upper half and a lower half. Since the flue gas flows from bottom to top, the outer surface of the lower half and the inner surface of the upper half are the surfaces that the rising flue gas can directly impact, i.e., the smoke-facing surface. The inner surface of the lower half and the outer surface of the upper half are the smoke-repelling surface. Several turbulent flow protrusions 512 are provided on the smoke-facing surface. The turbulence protrusions 512 and airflow holes 511 are arranged at intervals. When the smoke collides with the smoke-facing surface, part of the smoke flows along the surface of the baffle 51, while part of the smoke enters the adjacent tortuous channel 510 through the airflow holes 511. During this process, the smoke comes into contact with the turbulence protrusions 512 and is disturbed to form multiple small eddies, which effectively condenses and agglomerates dust and water mist and removes them.

[0054] Please continue reading. Figure 1 As shown, the desulfurization slurry tank 6 is used to store desulfurization slurry, which is also the desulfurizing agent. In this embodiment, it is limestone slurry. The desulfurization slurry is transported to the spraying device 3 by a circulating pump 7. The circulating pump 7 provides circulation power for the desulfurization slurry. In this embodiment, two circulating pumps 7 are provided, which can work simultaneously or selectively as needed to deliver desulfurization slurry to the spraying device 3. In other embodiments, one or more circulating pumps 7 may be provided. The replenishment device 8 is used to replenish fresh desulfurization slurry to the desulfurization slurry tank 6, and it may specifically include replenishment pipelines, replenishment tanks, etc.

[0055] Please see Figures 6 to 8 As shown, the gas-liquid dispersion plate 2 is generally rectangular in shape, and in the first direction ( Figure 1 As shown in the diagram, the flue gas duct 101 is arranged at a downward inclination from upstream to downstream in the direction of flue gas inlet. This arrangement causes the space of the flue gas duct 101 to be reduced in the first direction. That is, if the direction of flue gas inlet is taken as the length direction of the flue gas duct 101, then in this embodiment, the width of the flue gas duct 101 remains unchanged, while the height gradually decreases due to the inclined arrangement of the gas-liquid dispersion plate 2, thus reducing the space of the flue gas duct 101. In this embodiment, the space of the flue gas duct 101 is continuously and gradually reduced; in other embodiments, the flue gas duct 101 can also be configured to decrease in a gradient abrupt manner.

[0056] The gas-liquid dispersion plate 2 has multiple gas-liquid dispersion holes 202. In the first direction, the gas-liquid dispersion plate 2 defines a high-resistance section 21 near the smoke inlet and a low-resistance section 23 far from the smoke inlet. The low-resistance section 23 has a larger opening ratio than the high-resistance section 21. Since the kinetic energy of the flue gas weakens from upstream to downstream in the first direction (i.e., from the horizontal direction of flue gas entry), if the gas-liquid dispersion holes 202 and the flue gas flow channel 101 on the gas-liquid dispersion plate 2 are uniformly arranged, most of the flue gas will pass through the gas-liquid dispersion plate 2 from the upstream, while the portion of the gas-liquid dispersion plate 2 near the downstream will have less or no flue gas passing through, resulting in a flow deviation phenomenon. In the first direction, this utility model reduces the space of the flue gas passage 101 and increases the opening ratio of the gas-liquid dispersion holes 202, thereby balancing the pressure of the flue gas and distributing a portion of the flue gas downstream, thus promoting more uniform passage of the flue gas through each area of ​​the gas-liquid dispersion plate 2.

[0057] In this embodiment, specifically, the gas-liquid dispersion plate 2 sequentially defines multiple segments in the first direction, such as a high smoke resistance segment 21, a medium smoke resistance segment 22, and a low smoke resistance segment 23. The downstream segment has a higher open area ratio than the upstream segment. That is, in this embodiment, the medium smoke resistance segment 22 has a larger open area ratio than the high smoke resistance segment 21, and the low smoke resistance segment 23 has a smaller open area ratio. It is understood that this embodiment uses three segments as an example for illustration; however, in other embodiments, the segments can be two, four, or more. In other words, in other embodiments, the medium smoke resistance segment 22 may be absent, or multiple medium smoke resistance segments 22 may be configured. For embodiments with multiple medium smoke resistance segments 22, further, in the first direction, the open area ratios of the multiple medium smoke resistance segments 22 increase in a gradient. Additionally, it should be noted that in some embodiments, the porosity of the gas-liquid dispersion plate 2 can be continuously and gradually changed from the high smoke resistance section 21 to the low smoke resistance section 23, that is, the porosity is continuously and gradually increased.

[0058] Furthermore, each section also includes multiple gas-liquid dispersion units. Figure 6Only a few gas-liquid dispersion units within the high-resistance section 21 are exemplarily indicated, designated as 211. It can be understood that each section includes multiple gas-liquid dispersion units. The gas-liquid dispersion units configured in the low-resistance section 23 have a larger porosity than those configured in the high-resistance section. The gas-liquid dispersion holes 202 within adjacent gas-liquid dispersion units in the same section extend in different directions from bottom to top, and the porosity of multiple gas-liquid dispersion units within the same section is the same. That is, the porosity of multiple gas-liquid dispersion units configured in the low-resistance section 23 is the same, and the porosity of multiple gas-liquid dispersion units configured in the high-resistance section 21 is the same. This arrangement ensures that the amount of flue gas passing through two adjacent gas-liquid dispersion units is approximately equal, but in different directions, thereby forming two airflows with equal kinetic energy that can collide with each other. This impacts and shears the desulfurization slurry, forming dispersed fine droplets. Specifically, in some embodiments, two adjacent gas-liquid dispersion units exist within the same section, with the upward extension lines of their gas-liquid dispersion holes 202 intersecting directly above the dividing line between the two gas-liquid dispersion units; thus, two adjacent airflows collide. In other embodiments, four adjacent gas-liquid dispersion units exist within the same section in a grid pattern, with the upward extension lines of their gas-liquid dispersion holes 202 intersecting directly above the intersection point of the four gas-liquid dispersion units; thus, four airflows collide. These designs also generate turbulence in the flue gas as it passes through the gas-liquid dispersion plate 2, further promoting the mixing of the flue gas and the desulfurization slurry and improving desulfurization efficiency.

[0059] In this embodiment, the gas-liquid dispersion unit has multiple partitions 201 arranged at intervals, and elongated gas-liquid dispersion holes 202 are formed between adjacent partitions 201. Within the plane of the gas-liquid dispersion plate 2, the extension directions of the gas-liquid dispersion holes 202 in adjacent gas-liquid dispersion units are different. The gas-liquid dispersion holes 202 are arranged at an upward inclination, and the exhaust directions of the gas-liquid dispersion holes 202 in adjacent gas-liquid dispersion units are different to create flue gas turbulence. Specifically, the gas-liquid dispersion plate 2 includes multiple partitions 201, and gas-liquid dispersion holes 202 are formed between adjacent partitions 201. The inclination angle and spacing of the partitions 201 are optimized to ensure uniform distribution of flue gas within the flue gas flow channel 101 and to promote the flue gas to pass through the gas-liquid dispersion holes 202 at a suitable speed. The extension lines of the gas-liquid dispersion holes 202 in two adjacent gas-liquid dispersion units within the same section are shown below. Figure 8As shown, L1 and L2 intersect at point O above the gas-liquid dispersion plate 2, causing an impact. This impact disperses the desulfurization slurry and creates turbulence in the flue gas, increasing the gas-liquid contact mass transfer effect. In this embodiment, the angle between the upper and lower surfaces of the partition plate 201 and the gas-liquid dispersion plate 2 is between 20° and 40°. This avoids an angle that is too small, making it difficult for the flue gas to pass through; and at the same time, it avoids an angle that is too large, causing the flue gas passing through the gas-liquid dispersion holes 202 to fail to intersect and impact each other in the space between the spray device 3 and the gas-liquid dispersion plate 2, or causing the impact position to be too far away from the gas-liquid dispersion plate 2, thus weakening the impact effect.

[0060] In use, the flue gas desulfurization system provided by this utility model introduces flue gas generated in the electrolytic aluminum industry through the inlet and the flue gas flow channel 101 at the bottom of the desulfurization chamber 10. During the process of entering the flue gas flow channel 101, the flue gas is cooled and humidified by the temperature and humidity control device 1, which is beneficial to the subsequent reaction. Due to the special flue gas flow channel 101 structure and the special gas-liquid dispersion holes 202 on the gas-liquid dispersion plate 2, the pressure distribution of the flue gas from upstream to downstream is more uniform than that of the traditional structure. After being uniformly distributed, the flue gas rises through the gas-liquid dispersion plate 2. The gas-liquid dispersion holes 202 prevent flue gas from flowing out of the system. The spray device 3 sprays desulfurization slurry onto the gas-liquid dispersion plate 2. The desulfurization slurry is evenly dispersed into fine droplets by impact with the gas-liquid dispersion plate 2 and by the impact of the flue gas passing through the gas-liquid dispersion plate 2. The dispersed desulfurization slurry droplets come into full contact with the flue gas in the area above the gas-liquid dispersion plate 2, and a desulfurization reaction occurs. The alkaline substances such as calcium carbonate in the droplets react with the acidic gases such as sulfur dioxide in the flue gas to produce products such as sulfates. The purified flue gas after the reaction flows upward and, after passing through the demister 5 to remove dust particles and mist droplets, is discharged through the purified flue gas outlet at the top of the desulfurization chamber 10. The flushing device 4 is driven by water flow to rotate and spray flushing water onto the demister 5 to remove residual dust particles and slurry on the demister 5, thus maintaining the high efficiency of the demister 5. In addition, the unreacted desulfurization slurry flows back to the desulfurization slurry pool 6 from the bottom of the desulfurization chamber 10 through the circulation pump 7 for recycling. The replenishment device 8 replenishes the desulfurization slurry pool 6 with fresh desulfurization slurry to maintain the stable operation of the system.

[0061] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A flushing device for a flue gas desulfurization system, disposed below a component to be flushed within a desulfurization chamber, for spraying water onto the component, the flushing device comprising a liquid channel for liquid inflow and a plurality of self-rotating nozzles communicating with the liquid channel, characterized in that, The self-rotating nozzle includes: A connecting base, connected to the liquid channel, the connecting base having a connecting channel, the connecting channel having an inlet communicating with the liquid channel and an outlet for discharging liquid; and A rotating disk is rotatably disposed above the liquid outlet, and a turbine part and a dispersion part surrounding the outer periphery of the turbine part are provided on the side of the rotating disk facing the liquid outlet. The outlet is located within the coverage area of ​​the turbine, so that the water jet from the outlet impacts the turbine to drive it to rotate, and the water jet thrown out by the rotating turbine is cut and dispersed by the dispersion section before being sprayed out.

2. The flushing device for a flue gas desulfurization system as described in claim 1, characterized in that, The turbine section includes a plurality of arc-shaped protrusions extending outward in a vortex-like pattern from the center of the turbine section.

3. The flushing device for a flue gas desulfurization system as described in claim 2, characterized in that, A rotating water flow channel is formed between two adjacent arc-shaped protrusions, and the rotating water flow channel is gradually widened from the center of the turbine to the outer periphery.

4. The flushing device for a flue gas desulfurization system as described in claim 3, characterized in that, The dispersion section includes multiple partitions, and water outlet channels are formed between adjacent partitions to allow water to flow out.

5. The flushing device for a flue gas desulfurization system as described in claim 4, characterized in that, Each of the partitions extends radially along the rotating disk.

6. The flushing device for a flue gas desulfurization system as described in claim 4, characterized in that, The number of water outlet channels is greater than the number of rotating water flow channels.

7. The flushing device for a flue gas desulfurization system as described in claim 4, characterized in that, The location of the water outlet channel is higher than the location of the rotating water flow channel.

8. The flushing device for a flue gas desulfurization system as described in any one of claims 1 to 7, characterized in that, The connecting channel has a tapered section, which is tapered in diameter in the direction from the inlet to the outlet.

9. The flushing device for a flue gas desulfurization system as described in claim 8, characterized in that, The connecting channel is provided with a support rib connected to the inner wall of the connecting channel, and a rotating shaft extending along the axial direction of the connecting channel is provided on the support rib, and the rotating disk is connected to the rotating shaft.

10. A flue gas desulfurization system, characterized in that, Includes a desulfurization chamber, wherein the desulfurization chamber is equipped with: Spraying device for spraying desulfurization slurry; A gas-liquid dispersion plate is disposed below the spraying device to disperse the desulfurization slurry and flue gas to promote their mixing; and A demisting device is installed above the spraying device to remove water mist from the flue gas flowing through it; The flue gas desulfurization system includes a flushing device as described in any one of claims 1 to 9, wherein the flushing device is disposed below the demister and is used to flush the demister.

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