Demisting device for flue gas desulfurization system and flue gas desulfurization system

Abstract

The utility model provides a kind of demisting device and flue gas desulfurization system for flue gas desulfurization system. Among them, demisting device includes multiple demisting plates being arranged at intervals, demisting passage is formed between adjacent demisting plate, demisting plate is suitable for when flue gas flows from one end to another end of demisting passage, contact with flue gas to separate out water mist in flue gas. The demisting plate has the windward face of flue gas and the back of flue gas, and the through hole of flue gas that passes through the windward face and the back of flue gas. The through hole of flue gas allows part of flue gas to pass through demisting plate to reduce the resistance of demisting plate to flue gas. Several turbulence protrusions are provided on the windward face of flue gas, and the turbulence protrusions are configured to disturb the flue gas on the windward face of flue gas to form a turbulent flow, to improve the separation and removal of water mist in flue gas. The demisting device and flue gas desulfurization system provided by the utility model can realize low-resistance and high-efficiency demisting, and can improve the demisting effect while reducing energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of flue gas desulfurization technology, and in particular to a demisting device and a flue gas desulfurization system for use in 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, corrugated plate demisters and baffle plate demisters are commonly used for dust and mist removal. Their working principle is to separate liquid droplets entrained in the airflow through the bends created by the curved channels. Under the action of inertial force, the droplets cannot change direction with the airflow in time and collide with the baffles or collection tank, thus being captured. However, since corrugated plate demisters and baffle plate demisters mainly enhance droplet capture by extending and changing the flue gas flow path, the flue gas undergoes multiple bends through the demister channel, leading to a significant increase in system resistance. Especially when dealing with high-velocity flue gas, excessive resistance increases the energy consumption of the induced draft fan and may even cause secondary entrainment of the flue gas, thus reducing the quality of the clean flue gas emissions.

[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 invention provides a demisting device and a flue gas desulfurization system for use in flue gas desulfurization systems, which can achieve low-resistance and high-efficiency demisting, thereby improving the demisting effect while reducing system energy consumption.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a demister device for a flue gas desulfurization system, comprising a plurality of demister plates arranged at intervals, with demister channels formed between adjacent demister plates. The demister plates are adapted to contact the flue gas as it flows from one end of the demister channel to the other to separate water mist from the flue gas. The demister plates have: The smoke-facing surface is designed to contact and guide the flow of smoke during its movement. The side facing away from the smoke; and The smoke passage hole, which connects the smoke-facing surface and the smoke-repellent surface, allows some smoke to pass through the demister plate to reduce the resistance of the demister plate to the smoke. The smoke-facing surface is provided with several turbulent flow protrusions, which are configured to disturb the smoke to form turbulence on the smoke-facing surface, thereby improving the separation and removal of water mist in the smoke.

[0006] Optionally, the defogger is a folded plate, which includes an upper plate and a lower plate connected to form an angle, and the smoke-facing surface includes the surface of the lower plate facing outward of the angle and the surface of the upper plate facing inward of the angle.

[0007] Optionally, the included angle is a right angle or an obtuse angle to reduce the resistance of the flue gas flowing through the demisting channel.

[0008] Optionally, both the upper plate and the lower plate are inclined relative to the vertical plane to guide the flue gas to flow along the smoke-facing surface.

[0009] Optionally, the inclination angle of the upper plate and the lower plate relative to the vertical plane is 20° to 40°.

[0010] Optionally, the smoke passages and the turbulence protrusions are arranged in an array, and the smoke passages and the turbulence protrusions are arranged alternately in the row direction and / or column direction of the array.

[0011] Optionally, the turbulence protrusion forms an obtuse angle with the smoke-facing surface to allow the smoke to pass over the turbulence protrusion.

[0012] Optionally, the turbulence protrusion is an arc-shaped protrusion.

[0013] Optionally, the defogging channel is a tortuous channel.

[0014] This utility model also adopts the following technical solution: a flue gas desulfurization system, including a flue gas inlet, a flue gas outlet, and a desulfurization chamber that fluidly connects the two, wherein the desulfurization chamber is provided with: A spraying device used for spraying desulfurization slurry; A gas-liquid dispersion device, located below the spraying device, is used to disperse the desulfurization slurry and flue gas to promote thorough mixing and facilitate the desulfurization reaction; and A demisting device is installed above the spraying device and is used to remove water mist from the flue gas after the desulfurization reaction. The defogging device is the same as described above.

[0015] The demisting device provided by this utility model, by setting through-type smoke passage holes on the demisting plate and setting turbulence protrusions on the smoke-facing surface of the demisting plate, not only reduces the flow resistance of the flue gas by using the smoke passage holes, but also actively induces the flue gas to form turbulence by using the turbulence protrusions, which enhances the collision and separation of droplets and realizes the coagulation and aggregation of droplets, thereby achieving the effect of low resistance and high efficiency demisting, and significantly reducing system energy consumption while improving demisting efficiency. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a partial side view schematic diagram of an embodiment of the defogging device of this utility model.

[0018] Figure 2 This is a plan view of an embodiment of the defogging device of this utility model.

[0019] Figure 3 This is a schematic diagram of an embodiment of the flue gas desulfurization system of this utility model.

[0020] Explanation of reference numerals in the attached drawings: 10, desulfurization chamber; 101, flue gas flow channel; 1, temperature and humidity control device; 2, gas-liquid dispersion device; 3, spray device; 4, flushing device; 5, demister device; 51, demister plate; 510, demister channel; 5101, smoke-facing surface; 5102, smoke-repellent surface; 511, smoke passage hole; 512, turbulence protrusion; 6, desulfurization slurry pool; 7, circulating pump; 8, liquid replenishment device. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the 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 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.

[0022] 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.

[0023] 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 terms 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" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or its equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used only 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.

[0024] 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.

[0025] 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.

[0026] Please see Figures 1 to 3As shown, this utility model provides a demister 5 for a flue gas desulfurization system, including a plurality of demister plates 51 arranged at intervals, with a demister channel 510 formed between adjacent demister plates 51. The demister plates 51 are adapted to contact the flue gas to separate water mist from the flue gas as the flue gas flows from one end of the demister channel 510 to the other. Each demister plate 51 has a smoke-facing surface 5101 facing the flue gas and a smoke-receiving surface 5102 facing the flue gas. The smoke-facing surface 5101 is adapted to contact and guide the flue gas flow during the flue gas flow process, and the smoke-receiving surface 5102 is the back side of the demister plate 51 opposite to the smoke-facing surface 5101. Each demister plate 51 has a smoke-passing hole 511 penetrating the smoke-facing surface 5101 and the smoke-receiving surface 5102. The smoke-passing hole 511 allows some flue gas to pass through the demister plate 51 to reduce the resistance of the demister plate 51 to the flue gas. The smoke-facing surface 5101 is provided with a turbulent flow protrusion 512, which is configured to disturb the smoke gas and form turbulence on the smoke-facing surface 5101, so as to improve the separation and removal effect of water mist in the smoke gas.

[0027] The demisting device 5 provided by this utility model, by setting a through-type smoke passage hole 511 on the demisting plate 51 and setting a turbulence protrusion 512 on the smoke-facing surface 5101 of the demisting plate 51, not only reduces the flow resistance of the flue gas by using the smoke passage hole 511, but also actively induces the flue gas to form turbulence by using the turbulence protrusion 512, which enhances the collision and separation of droplets and realizes the coagulation and aggregation of droplets, thereby achieving the effect of low resistance and high efficiency demisting, so as to significantly reduce the system energy consumption while improving the demisting efficiency.

[0028] Please see Figure 1 and Figure 2As shown, the core of the demister device 5 for a flue gas desulfurization system provided in this embodiment lies in achieving low resistance and high-efficiency demisting through optimized structure of the demister plate 51. Specifically, the demister device 5 includes multiple demister plates 51 arranged at intervals, with adjacent demister plates 51 forming a demister channel 510 for flue gas flow. One side of each demister plate 51 is a smoke-facing surface 5101 in contact with the flue gas, and the other side is a smoke-repellent surface 5102 facing away from the flue gas. The smoke-facing surface 5101 is used to guide the flue gas flow direction on the one hand, and to disturb the airflow through its surface structure on the other hand. Since the smoke-facing surface 5101 needs to guide the flue gas flow, it is set at a reasonable angle with the rising flue gas to help guide the flue gas flow and reduce resistance. In this embodiment, the inclination angle of the smoke-facing surface 5101 relative to the vertical plane is 20°~40°, preferably 25°~35°. The back smoke surface 5102 is the side opposite to the front smoke surface 5101, and the two are opposite sides of the demister plate 51, connected by a smoke passage hole 511. The smoke passage hole 511 penetrates both the front smoke surface 5101 and the back smoke surface 5102, allowing some flue gas to pass through the demister plate 51. This design reduces the resistance caused by traditional demister devices that completely block the flow of flue gas, forcing it to flow only along a tortuous path. The distribution density and aperture of the smoke passage hole 511 can be set according to the actual flue gas flow rate, but their total area ratio must be within a preset range to avoid excessive flue gas flow leading to a decrease in demister efficiency.

[0029] The smoke-facing surface 5101 is provided with several turbulent flow protrusions 512. These protrusions 512 alter the flow field characteristics of the smoke-facing surface 5101, causing localized turbulence in the flue gas during its flow. Specifically, this manifests as the formation of numerous tiny eddies at the interface between the protrusions 512 and the smoke-facing surface 5101. The formation of these eddies enhances the inertial collision effect of droplets in the flue gas, causing tiny droplets to coalesce or be captured by the demister surface, thereby improving demisting efficiency. In this embodiment, the protrusions 512 are arc-shaped protrusions, forming an obtuse angle transition at their connection with the smoke-facing surface 5101. This design allows the flue gas to pass over the protrusions 512, achieving demisting efficiency while allowing the flue gas to continue flowing and discharging, reducing obstruction of the flue gas and preventing secondary entrainment of droplets due to flue gas accumulation.

[0030] Please see Figure 2As shown, in this embodiment, the smoke passage holes 511 and the turbulence protrusions 512 are arranged in an array on the smoke-facing surface 5101, and the smoke passage holes 511 and the turbulence protrusions 512 are alternately arranged in the row and column directions of the array. Specifically, in any row, the smoke passage holes 511 and the turbulence protrusions 512 are alternately arranged; in any column, they are also alternately arranged. This arrangement allows the flue gas to generate turbulence in local areas due to the turbulence protrusions 512, while also passing quickly through the smoke passage holes 511, avoiding concentrated local pressure loss. This alternating arrangement ensures that the turbulence generation area and the low-resistance area are evenly distributed, avoiding the resulting flow field imbalance of the flue gas. In other embodiments, the smoke passage holes 511 and the turbulence protrusions 512 may also be arranged alternately only in the row direction or only in the column direction.

[0031] Please continue reading. Figure 1 As shown, in this embodiment, the demister plate 51 is a folded plate, roughly in the shape of a "<", thus forming a demister channel 510 that is also a tortuous channel roughly in the shape of a "<". Specifically, the demister plate 51 includes an upper plate and a lower plate connected to form an angle, and the smoke-facing surface 5101 includes the surface of the lower plate facing outward of the angle and the surface of the upper plate facing inward of the angle. The angle is a right angle or an obtuse angle to reduce the resistance of the flue gas flowing through the demister channel 510. The angle is preferably set between 100° and 120°. In this embodiment, both the upper plate and the lower plate are inclined relative to the vertical plane to guide the flue gas to flow along the smoke-facing surface 5101. Preferably, the inclination angle of the upper and lower plates relative to the vertical plane is 20° to 40°, specifically 25°, 30°, 35°, etc. The folded plate structure makes the demisting channel 510 a non-linear flow channel. During the flow, the flue gas collides with the folded plate surface multiple times due to inertia, making it easier for droplets to be captured. At the same time, the presence of the flue gas passage 511 reduces the overall resistance of the folded plate to the flue gas, which can significantly reduce the energy consumption of the induced draft fan, especially under high flow rate conditions.

[0032] This embodiment uses a two-fold defogging plate 51 as an example for illustration. It can be understood that in other embodiments, the defogging plate 51 can be a three-fold plate, a four-fold plate, or an S-shaped wavy plate. In addition, in some embodiments, the defogging device 5 can also be composed of a defogging plate 51 that is tilted in only one direction. In use, multiple defogging devices 5 can be stacked and used in different tilt directions of the defogging plate 51 to assemble a tortuous channel.

[0033] During the flue gas demisting process, the flue gas enters the demisting channel 510 and, after impacting the smoke-facing surface 5101 of the demisting plate 51, is divided into two parts, such as... Figure 1As indicated by the dashed arrow, a portion of the flue gas flows along the smoke-facing surface 5101, forming turbulence under the action of the turbulence protrusions 512. Droplets are separated due to inertial collisions, and eddies are formed, causing fine water mist to condense into larger droplets and be captured. The other portion passes through the smoke-passing holes 511, reducing overall resistance. Simultaneously, because the smoke-passing holes 511 and the turbulence protrusions 512 are arranged alternately in the rows and columns of the array, each smoke-passing hole 511 is surrounded by four turbulence protrusions 512. This ensures that the flue gas passing through the smoke-passing holes 511 is also flue gas that has had some water mist removed through eddies, without reducing the demisting efficiency. The flue gas passing through the lower plate of the demisting plate 51 continues to flow upwards, impacting the smoke-facing surface 5101 of the upper plate of the demisting plate 51, where the aforementioned collision separation and eddy current phenomena continue to occur, further separating the water mist.

[0034] Furthermore, particle trajectory tracking combined with the aforementioned eddy current control can further enhance droplet coagulation and achieve low-resistance dust and mist removal effects. Specifically, using a high-resolution microscope and a high-frame-rate high-speed camera under a special lighting system, the trajectory of particles in the airflow is tracked to understand their motion. Then, based on the experimental data, a mathematical model is established using numerical simulation to describe the interaction forces between particles and the interaction between particles and the airflow. This yields the particle trajectories in complex flow fields. The calculated trajectories are compared with the observed actual particle trajectories to optimize the calculation model and improve the accuracy and reliability of the simulation. Based on trajectory tracking calculations, the hierarchical transmission control of eddies at different scales is further studied, including analyzing the characteristics of eddies in the flow field and designing appropriate control strategies to achieve precise control of droplets and dust. Based on this, the coagulation and aggregation of fine droplets and dust particles are controlled to achieve efficient dust and mist removal effects.

[0035] Please refer to the following: Figure 1 As shown, this utility model also provides a flue gas desulfurization system. The flue gas desulfurization system includes a flue gas inlet, a flue gas outlet, and a desulfurization chamber 10 connecting the two in fluid communication, as well as a temperature and humidity control device 1, a gas-liquid dispersion device 2, a spray device 3, a flushing device 4, a demisting device 5, a desulfurization slurry tank 6, a circulating pump 7, and a liquid replenishment device 8. The demisting device 5 is the demisting device 5 described in any of the above embodiments.

[0036] The desulfurization chamber 10 is the core area of ​​the desulfurization reaction, and it is equipped with the gas-liquid dispersion device 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 device 2, spray device 3, flushing device 4, and demister 5 are arranged roughly 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 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.

[0037] 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 through 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 through the temperature and humidification device 1 allows sulfur dioxide in the flue gas to pre-react with water to generate sulfurous acid, thereby accelerating the subsequent reaction with limestone and increasing reaction efficiency.

[0038] 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.

[0039] Please continue reading. Figure 1 As shown, the gas-liquid dispersion device 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 device 2. The gas-liquid dispersion device 2 has a plurality of gas-liquid dispersion holes that extend vertically through the gas-liquid dispersion device 2, so that the flue gas in the flue gas flow channel 101 passes upward through the gas-liquid dispersion device 2 and flows into the space between the spray device 3 and the gas-liquid dispersion device 2.

[0040] The spraying device 3 is arranged above the gas-liquid dispersion device 2 and is spaced apart from it. The spraying device 3 is used to spray desulfurization slurry onto the gas-liquid dispersion device 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 device 2. The spraying device 3 employs a multi-nozzle design, and the nozzle arrangement and spray intensity are precisely calculated to ensure that the desulfurization slurry can be uniformly sprayed onto all areas of the gas-liquid dispersion device 2. The desulfurization slurry sprayed from the spraying device 3 is uniformly dispersed into fine droplets by impact with the gas-liquid dispersion device 2 and by the impact of the flue gas passing through the gas-liquid dispersion device 2.

[0041] 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 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 and is used 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 device 2 to flush the gas-liquid dispersion device 2, removing dust and impurities adhering to the gas-liquid dispersion device 2 and keeping the system clean and operating efficiently.

[0042] 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.

[0043] In use, the flue gas desulfurization system provided by this utility model introduces flue gas generated in the electrolytic aluminum industry through an inlet into 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. While the flue gas flows in the first direction within the flue gas flow channel 101, a portion of the flue gas flows upward through the gas-liquid dispersion device 2. Due to the special structure of the flue gas flow channel 101 and the distribution of the gas-liquid dispersion device 2, the pressure distribution of the flue gas from upstream to downstream is more uniform compared to traditional structures, and the flue gas is evenly dispersed. After distribution, the slurry flows upward through the gas-liquid dispersion holes on the gas-liquid dispersion device 2. The spraying device 3 sprays the desulfurization slurry onto the gas-liquid dispersion device 2. The desulfurization slurry is uniformly dispersed into fine droplets by impact with the gas-liquid dispersion device 2 and the flue gas passing through the gas-liquid dispersion device 2. The dispersed desulfurization slurry droplets come into full contact with the flue gas in the area above the gas-liquid dispersion device 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, it is discharged through the purified flue gas outlet at the top of the desulfurization chamber 10. At the same time, 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.

[0044] As can be seen from the above description of the specific embodiments, the demister for a flue gas desulfurization system provided by this utility model adopts a horizontal reactor, which can reduce the flow rate, increase the reaction time, improve the desulfurization efficiency, reduce the liquid-to-gas ratio, reduce the circulating pump head, reduce energy consumption, and has a low height and compact structure, making it easy to install and maintain. The pretreatment of the flue gas by the temperature and humidity control device 1 reduces the flue gas temperature and increases the humidity, improving the stability and reliability of the system and increasing the subsequent reaction speed. Forced airflow collision is used to break up the desulfurization slurry, reducing the droplet size and increasing the specific surface area. The area and the turbulence caused by airflow collision further promote gas-liquid mixing, and the airflow is used to destroy the liquid film of calcium carbonate slurry, increasing the reaction efficiency; by setting a through-type smoke passage hole 511 on the demister plate 51 and a turbulence protrusion 512 on the smoke-facing surface 5101 of the demister plate 51, the smoke passage hole 511 is used to reduce the flow resistance of the flue gas, and the turbulence protrusion 512 is used to actively induce the flue gas to form turbulence, enhance the collision and separation of droplets and realize the agglomeration of droplets, thereby achieving the effect of low resistance and high efficiency demisting, so as to significantly reduce the system energy consumption while improving the demisting efficiency.

[0045] 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 demister for a flue gas desulfurization system, comprising a plurality of demister plates arranged at intervals, with demister channels formed between adjacent demister plates, wherein the demister plates are adapted to contact the flue gas to separate water mist from the flue gas as the flue gas flows from one end of the demister channel to the other, characterized in that, The demister plate has: A smoke-facing surface facing the flue gas and a smoke-repelling surface facing away from the flue gas, wherein the smoke-facing surface is adapted to contact and guide the flue gas flow during flue gas flow; and The smoke passage hole, which connects the smoke-facing surface and the smoke-repellent surface, allows some smoke to pass through the demister plate to reduce the resistance of the demister plate to the smoke. The smoke-facing surface is provided with several turbulent flow protrusions, which are configured to disturb the smoke gas and form turbulence on the smoke-facing surface, so as to improve the separation and removal of water mist in the smoke gas.

2. The defogging device as described in claim 1, characterized in that, The defogging plate is a folded plate, which includes an upper plate and a lower plate that are connected to form an angle. The smoke-facing surface includes the surface of the lower plate facing outward of the angle and the surface of the upper plate facing inward of the angle.

3. The defogging device as described in claim 2, characterized in that, The included angle is a right angle or an obtuse angle to reduce the resistance of the flue gas flowing through the demister channel.

4. The defogging device as described in claim 3, characterized in that, Both the upper and lower plates are inclined relative to the vertical plane to guide the flue gas to flow along the smoke-facing surface.

5. The defogging device as described in claim 4, characterized in that, The inclination angle of the upper plate and the lower plate relative to the vertical plane is 20°~40°.

6. The demisting device as described in any one of claims 1 to 5, characterized in that, The smoke passages and the turbulence protrusions are arranged in an array, and the smoke passages and the turbulence protrusions are arranged alternately in the row direction and / or column direction of the array.

7. The demisting device as described in any one of claims 1 to 5, characterized in that, The turbulence protrusion forms an obtuse angle with the smoke-facing surface to allow the smoke to pass over the turbulence protrusion.

8. The defogging device as described in claim 7, characterized in that, The turbulence protrusion is an arc-shaped protrusion.

9. The demisting device as described in any one of claims 1 to 5, characterized in that, The defogging channel is a tortuous channel.

10. A flue gas desulfurization system, comprising a flue gas inlet, a flue gas outlet, and a desulfurization chamber fluidly communicating between the two, characterized in that, The desulfurization chamber is equipped with: A spraying device used for spraying desulfurization slurry; A gas-liquid dispersion device is installed below the spraying device. It is used to disperse the desulfurization slurry and flue gas to promote full mixing of the two and carry out the desulfurization reaction. as well as A demisting device is installed above the spraying device and is used to remove water mist from the flue gas after the desulfurization reaction. The defogging device is any one of the defogging devices described in claims 1 to 9.

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