A magnesium method flue gas desulfurization device

Abstract

The application discloses a magnesium method flue gas desulfurization device, which comprises a desulfurization tower body, a spraying assembly, a flow guide assembly and a flow collecting cylinder. The desulfurization tower body is provided with a flue gas inlet pipe at one end for flue gas introduction and a flue gas outlet pipe at the other end for flue gas discharge. The spraying assembly is arranged in the desulfurization tower body and provides desulfurization slurry for absorbing sulfur dioxide in the flue gas in the desulfurization tower body. The flow guide assembly is arranged in the flue gas outlet pipe and is used for forming a flow guide effect on the flue gas in the desulfurization tower body. The flow collecting cylinder is arranged below the spraying assembly in the desulfurization tower body and is provided with a mounting plate. The mounting plate is coaxially provided with the flow collecting cylinder. A plurality of spray holes are arranged on the side wall of the flow collecting cylinder and close to the inner bottom edge. The magnesium method flue gas desulfurization device can realize double-layer desulfurization effect through single supply of the desulfurization slurry in the desulfurization tower body, fully utilize the desulfurization slurry and fully absorb the sulfur dioxide in the flue gas.

Description

Technical Field

[0001] This invention relates to the field of coal-fired flue gas treatment technology, specifically to a magnesium-based flue gas desulfurization device. Background Technology

[0002] Sulfur dioxide in coal-fired flue gas needs to be removed by adding desulfurizing agents to meet the limits stipulated in national and local emission standards and discharge permits. Commonly used desulfurizing agents include calcium carbonate, calcium oxide, and magnesium oxide. Among them, magnesium oxide has high desulfurization efficiency. Because the solubility of magnesium sulfate is much higher than that of calcium sulfate, there is less waste residue in the sedimentation tank and less material buildup on the inner wall of the desulfurization tower. Therefore, the magnesium oxide wet desulfurization process is widely used.

[0003] In the paper-faced gypsum board production industry, which uses coal as its main fuel, when desulfurizing flue gas from coal combustion using a desulfurization tower, magnesium oxide is first mixed with water to form a desulfurization slurry, which is then evenly sprayed into the interior of the desulfurization tower. The slurry operates in the opposite direction to the emitted flue gas. The magnesium oxide desulfurization slurry absorbs sulfur dioxide to generate magnesium sulfite, which then enters an aeration tank where a large amount of air is introduced for oxidation to generate magnesium sulfate. At the same time, the desulfurized flue gas is emitted without pollution.

[0004] Existing desulfurization devices cannot fully utilize the desulfurization slurry to absorb and remove sulfur dioxide from flue gas. Therefore, there is a need to provide a magnesium-based flue gas desulfurization device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a magnesium-based flue gas desulfurization device to solve the problems of insufficient absorption of sulfur dioxide in flue gas and inability to achieve double-layer desulfurization with a single supply in existing devices.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0007] In a first aspect of the invention, a magnesium-based flue gas desulfurization device is provided, comprising: a desulfurization tower body, one end of which is provided with a flue gas inlet pipe for introducing flue gas, the flue gas inlet pipe being inclined downwards along the central axis of the desulfurization tower body, and the other end of which is provided with a flue gas outlet pipe for discharging flue gas, the flue gas inlet pipe being inclined upwards along the central axis of the desulfurization tower body; a spray assembly disposed inside the desulfurization tower body, the spray assembly providing the interior of the desulfurization tower body with a desulfurization slurry for absorbing sulfur dioxide in the flue gas, the spray assembly including spray heads disposed on the inner wall of the desulfurization tower body, the spray heads spraying radially along the cross-section of the desulfurization tower body, thereby forming a spray surface inside the desulfurization tower body for absorbing sulfur dioxide in the flue gas; and a flow guide. The components are located inside the flue gas outlet pipe. The flow guiding component is used to guide the flue gas inside the desulfurization tower body. The flow guiding component includes flow guiding vanes. The collector is located inside the desulfurization tower body, directly below the spray component. The collector is installed on the mounting plate and is coaxially arranged with the desulfurization tower body. The jets from the spray heads converge in the collector. The collector has multiple spray holes circumferentially arranged on its side wall near its inner bottom edge, so that the fluid inside the collector can flow out circumferentially. In a unit time, the spray flow rate of the spray component is greater than the discharge flow rate of the collector, so that the fluid inside the collector accumulates and generates liquid pressure, which forces the fluid near the spray holes to form a jet along the circumference of the collector when it flows out.

[0008] Furthermore, the collector cylinder is located above the mounting plate and is driven by a power motor mounted on the mounting plate, so that the jet in the nozzle is converted into a swirling flow that sprays toward the side wall of the desulfurization tower by rotating the collector cylinder.

[0009] Furthermore, the output shaft of the power motor passes through the collector cylinder and is connected to a rotating rod coaxially arranged inside the collector cylinder. The rotating rod is provided with blades in the circumferential direction. The jets from the nozzles are all located in the lower region between the two jets of adjacent spray heads, so that the jets generated by the nozzles fill the gaps between the jets generated by the spray heads. The depth of the blades in the collector cylinder corresponds to the position of the nozzles, so as to increase the range of the jets generated by the nozzles by driving the fluid to rotate through the blades.

[0010] Furthermore, the bottom of the collector tube is rotatably connected to the mounting plate, and the central axis of the nozzle is tangentially set along the outer wall of the collector tube, so as to use the reaction force of the jet generated by the nozzle to make the collector tube itself rotate.

[0011] Furthermore, the bottom of the collector tube is fixedly connected to the mounting plate, and a first piston is coaxially arranged inside the collector tube; wherein, the first piston is disposed on the top edge of the collector tube by at least two oppositely arranged elastic elements, and the first piston can gradually move downward to pass the nozzle position as the fluid in the collector tube increases, so as to increase the flow velocity of the jet generated by the nozzle by utilizing the fluid pressure in the collector tube.

[0012] Furthermore, the opening end of the collector tube narrows inward to form a variable diameter orifice, and a second piston is installed inside the variable diameter orifice; wherein, the second piston is connected to the first piston by a spring column below, so that the collector tube has the following two working conditions as the spray assembly starts and stops:

[0013] First operating condition: The spray assembly starts working. As the fluid in the variable diameter port increases, the second piston is compressed by the fluid pressure until the second piston completely leaves the variable diameter port area and forms a fluid inlet gap with the variable diameter port, causing the fluid to rush into the collector cylinder at an accelerated rate. As the fluid pressure in the collector cylinder increases, the first piston is stretched by the fluid pressure and moves down until the first piston passes the spray hole. During this process, the first piston gradually drives the bottom end of the spring column to move down until it recovers its deformation and gradually drives the second piston to move down synchronously, so that the second piston loses its obstruction effect on the fluid.

[0014] Second operating condition: The spray assembly stops working, the fluid no longer collects in the collection cylinder, and some fluid is discharged through the spray holes. The fluid pressure in the collection cylinder decreases, and the elastic element contracts, causing the first piston to drive the second piston to move upward and reset.

[0015] Furthermore, a guide hole is provided inside the first piston, which penetrates the top wall and side wall of the first piston. When the first piston is moved to the nozzle position, the guide hole and the nozzle are connected to form a fluid jet channel.

[0016] Furthermore, the desulfurization tower body is coaxially provided with an inner cylinder below the spray assembly. The inner diameter of the inner cylinder gradually decreases from both ends to the middle, thereby accelerating the flow of flue gas inside the inner cylinder.

[0017] Furthermore, the inner cylinder is made of an elastic material, and the wall thickness of the inner cylinder gradually decreases from both sides to the middle. The two ends of the inner cylinder are sealed with the inner wall of the desulfurization tower to form a deformation cavity. The side wall of the desulfurization tower is provided with an air inlet. When the deformation cavity is filled with air through the air inlet, the middle area of ​​the inner cylinder will deform first, so as to form a cylindrical structure with an inner diameter that gradually decreases from both ends to the middle, thereby controlling the flow velocity of flue gas in the inner cylinder.

[0018] Furthermore, a tile plate for guiding flue gas flow is provided inside the flue gas inlet. The end of the tile plate is provided with a guide outer edge for receiving the desulfurization slurry falling from the inner wall of the desulfurization tower to the flue gas inlet. The concave surface of the tile plate is used to guide the flue gas, and the convex surface of the tile plate is used to discharge the desulfurization slurry out of the flue gas inlet.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The present invention aims to achieve a double-layer desulfurization effect by setting up a collector cylinder to enable a single supply of desulfurization slurry in the desulfurization tower, thereby achieving full utilization of the desulfurization slurry and allowing sulfur dioxide in the flue gas to be fully absorbed by the desulfurization slurry. Attached Figure Description

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] Figure 1 A three-dimensional structural diagram of a magnesium-based flue gas desulfurization device provided by the present invention;

[0023] Figure 2 for Figure 1 Side view;

[0024] Figure 3 For Figure 2 A sectional view;

[0025] Figure 4 for Figure 3 Enlarged view of section I-I;

[0026] Figure 5 for Figure 3 Enlarged view of section II-II;

[0027] Figure 6 This is a schematic diagram of another embodiment of the collector provided by the present invention;

[0028] Figure 7 for Figure 6 Enlarged view of section III-III;

[0029] Figure 8 A schematic diagram of another embodiment of the manifold provided by the invention;

[0030] Figure 9 This is a jet pattern formed by the spray head and nozzles;

[0031] Figure 10 This is a schematic diagram of another embodiment of the manifold provided by the present invention;

[0032] Figure 11 for Figure 10 The BB-directed sectional view is shown below;

[0033] Figure 12 This is a schematic diagram of another embodiment of the manifold;

[0034] Figure 13 for Figure 12 A schematic diagram of the structure of the first piston in another embodiment of the present invention;

[0035] Figure 14This is a schematic diagram of another embodiment of the desulfurization tower body provided by the present invention;

[0036] Figure 15 for Figure 14 Schematic diagram of the structure of section IV-IV;

[0037] Figure 16 This is a schematic diagram of another embodiment of the desulfurization tower body provided by the present invention;

[0038] Figure 17 for Figure 16 A schematic diagram of the deformation cavity in the desulfurization tower body under the gas-filled state;

[0039] Figure 18 for Figure 3 A schematic diagram of the structure of the flue gas inlet pipe in another embodiment of the present invention;

[0040] Figure 19 for Figure 18 Perspective view of the flue gas inlet pipe;

[0041] Figure 20 for Figure 19 Side view.

[0042] The labels in the diagram represent the following:

[0043] 10. Desulfurization tower body; 11. Flue gas inlet pipe; 111. Tile plate; 112. Guide outer edge; 12. Flue gas outlet pipe; 13. Mounting plate; 14. Power motor; 141. Output shaft; 15. Inner cylinder; 16. Deformation cavity; 17. Air inlet; 20. Spray assembly; 21. Spray head; 30. Flow guiding assembly; 31. Flow guiding vane; 40. Collector cylinder; 41. Spray hole; 42. Rotating rod; 421. Paddle blade; 43. First piston; 431. Flow guiding hole; 44. Elastic element; 45. Variable diameter port; 46. Second piston; 461. Spring column. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] like Figures 1-5 As shown, the present invention provides a magnesium-based flue gas desulfurization device, comprising:

[0046] The desulfurization tower body 10 has a flue gas inlet pipe 11 at one end for introducing flue gas. The flue gas inlet pipe 11 is inclined to the central axis of the desulfurization tower body 10 and the opening is downward. The desulfurization tower body 10 has a flue gas outlet pipe 12 at the other end for discharging flue gas. The flue gas inlet pipe 11 is inclined to the central axis of the desulfurization tower body 10 and the opening is upward.

[0047] The spray assembly 20 is disposed inside the desulfurization tower body 10. The spray assembly 20 provides the desulfurization slurry for absorbing sulfur dioxide in the flue gas to the inside of the desulfurization tower body 10. The spray assembly 20 includes spray heads 21 disposed on the inner wall of the desulfurization tower body 10. The spray heads 21 spray radially along the cross-section of the desulfurization tower body 10, thereby forming a spray surface inside the desulfurization tower body 10 for absorbing sulfur dioxide in the flue gas.

[0048] The flow guiding component 30 is located inside the flue gas outlet pipe 12. The flow guiding component 30 is used to guide the flue gas inside the desulfurization tower body 10. The flow guiding component 30 includes a flow guiding swirl vane 31.

[0049] The collector cylinder 40 is located inside the desulfurization tower body 10, directly below the spray assembly 20. The collector cylinder 40 is coaxially arranged with the desulfurization tower body 10 on the mounting plate 13, and the jets of the spray head 21 converge in the collector cylinder 40.

[0050] The collector cylinder 40 has multiple spray holes 41 circumferentially arranged on its side wall near its inner bottom edge, so that the fluid inside the collector cylinder 40 can flow out along its circumference. In a unit time, the spray flow rate of the spray assembly 20 is greater than the discharge flow rate of the collector cylinder 40, so that the fluid inside the collector cylinder 40 accumulates and generates liquid pressure, which forces the fluid near the spray holes 41 to form a jet along the circumference of the collector cylinder 40 when it flows out.

[0051] The present invention aims to achieve a double-layer desulfurization effect by setting up the collection cylinder 40 to enable a single supply of desulfurization slurry in the desulfurization tower body 10, thereby achieving full utilization of the desulfurization slurry and enabling the sulfur dioxide in the flue gas to be fully absorbed by the desulfurization slurry. Specifically, after the flue gas enters the desulfurization tower body 10 from the flue gas inlet pipe 11, it rises along its interior until it comes into contact with the desulfurization slurry jet generated by the spray assembly 20 and the collection cylinder 40 to produce a desulfurization reaction. The desulfurized flue gas continues to rise under the guidance of the guide vanes 31 in the flue gas outlet pipe 12 until it is discharged into the atmosphere, while most of the waste liquid generated by the desulfurization reaction flows down along the inner wall of the desulfurization tower body 10 and is discharged and collected through the flue gas inlet pipe 11.

[0052] In the above embodiments, the nozzle 41 relies solely on the liquid pressure generated by the fluid accumulation inside the collector cylinder 40 to form a jet along the circumference of the collector cylinder 40, which limits the range that the jet can cover inside the desulfurization tower body 10.

[0053] To solve the above problems, such as Figures 6-7As shown, in another embodiment of the present invention, the collector cylinder 40 is located above the mounting plate 13 and is driven by the power motor 14 provided on the mounting plate 13, so that the jet in the nozzle 41 is converted into a swirling flow sprayed toward the side wall of the desulfurization tower body 10 by the rotation of the collector cylinder 40.

[0054] In this embodiment, the nozzle 41 uses the centrifugal force generated during the rotation of the collector cylinder 40 to throw out the desulfurization slurry, thereby increasing the range that the jet can cover inside the desulfurization tower body 10.

[0055] To address the problem in this embodiment of the invention where the gap between the jets generated by two adjacent spray heads 21 is too large, resulting in sparse jet coverage and causing some flue gas to be discharged directly upwards through the jet gap without desulfurization, such as... Figures 8-9 As shown, the present invention provides another preferred embodiment, wherein the output shaft 141 of the power motor 14 passes through the collector cylinder 40 and is connected to the rotating rod 42 coaxially arranged inside the collector cylinder 40, and the rotating rod 42 is provided with blades 421 in the circumferential direction;

[0056] The jets from the nozzles 41 are all located in the lower region between the two jets of the adjacent spray heads 21, so that the jets generated by the nozzles 41 fill the gaps between the jets generated by the spray heads 21. The depth of the blades 421 in the collector cylinder 40 corresponds to the position of the nozzles 41, so that the blades 421 drive the fluid to rotate and increase the range of the jets generated by the nozzles 41.

[0057] In this embodiment, on the one hand, the paddle 421 installed inside the collector 40 agitates the desulfurization slurry inside the collector 40 to be discharged through the nozzle 41 at a higher pressure, thereby increasing the coverage of the generated jet. On the other hand, the staggered arrangement of the spray head 21 and the nozzle 41 on different planes allows the jet generated by the nozzle 41 to fill the gap between the jets generated by the spray head 21 on the plane above it, thereby forming a relatively dense desulfurization area in three-dimensional space, which improves the desulfurization reaction rate and enhances the desulfurization effect.

[0058] In the above embodiments, the movement of the manifold 40 requires the drive of the power motor 14. The power motor 14 is in a humid and acidic environment for a long time, and it is easily damaged even with the protection of the motor cover.

[0059] To solve the above problems, such as Figures 10-11 As shown, in another embodiment of the present invention, the bottom of the collector cylinder 40 is rotatably connected to the mounting plate 13, and the central axis of the nozzle 41 is tangentially arranged along the outer wall of the collector cylinder 40, so as to use the reaction force of the jet generated by the nozzle 41 to make the collector cylinder 40 rotate itself.

[0060] In this embodiment, the collector cylinder 40 generates a jet reaction force through the spray holes 41 arranged tangentially along its outer wall, causing the collector cylinder 40 to rotate. This allows the centrifugal force generated by the rotation of the collector cylinder 40 to throw out the desulfurization slurry from the spray holes 41 without the need for power input, thereby increasing the coverage area of ​​the desulfurization slurry jet within the desulfurization tower body 10.

[0061] In the above embodiments, when the spray flow rate of the spray assembly 20 is not greater than the discharge flow rate of the collector 40, the collector 40 cannot accumulate desulfurization slurry to generate liquid pressure. This may cause the desulfurization slurry to drip from the spray hole 41 when it first enters the collector 40, and thus fail to form an effective desulfurization surface for the flue gas inside the desulfurization tower 10.

[0062] To solve the above problems, such as Figures 12-13 As shown, in another embodiment of the present invention, the bottom of the collector cylinder 40 is fixedly connected to the mounting plate 13, and a first piston 43 is coaxially provided inside the collector cylinder 40;

[0063] The first piston 43 is disposed on the top edge of the collector cylinder 40 by at least two oppositely arranged elastic members 44. The first piston 43 can gradually move downward to the position of passing the nozzle 41 as the fluid in the collector cylinder 40 increases, so as to increase the flow rate of the jet generated by the nozzle 41 by utilizing the fluid pressure in the collector cylinder 40.

[0064] In this embodiment, the desulfurization slurry is accumulated in the collection cylinder 40 to a certain amount before being discharged from the nozzle 41. Due to the liquid pressure, the jet generated by the nozzle 41 can cover a large area.

[0065] In another preferred embodiment of the present invention based on the above embodiments, the opening end of the collector 40 is narrowed inward to form a variable diameter port 45, and a second piston 46 is provided inside the variable diameter port 45;

[0066] The second piston 46 is connected to the first piston 43 via a spring post 461, so that the collector cylinder 40 has the following two working conditions as the spray assembly 20 is started and stopped:

[0067] First working condition: The spray assembly 20 starts to work. As the fluid in the variable diameter port 45 increases, the second piston 46 is compressed by the fluid pressure until the second piston 46 completely leaves the variable diameter port 45 area and forms a fluid inlet gap with the variable diameter port 45, so that the fluid accelerates into the collection cylinder 40.

[0068] As the fluid pressure inside the collector cylinder 40 increases, the first piston 43 stretches the elastic element 44 downward due to the fluid pressure until the first piston 43 passes the nozzle 41. During this process, the first piston 43 gradually drives the bottom end of the spring column 461 to move downward until it recovers its deformation and then gradually drives the second piston 46 to move downward synchronously, so that the second piston 46 loses its obstruction effect on the fluid.

[0069] Second operating condition: The spray assembly 20 stops working, the fluid no longer collects in the collection cylinder 40, and some of the fluid is discharged through the spray hole 41. After that, the fluid pressure in the collection cylinder 40 decreases, and the elastic element 44 contracts, causing the first piston 43 to drive the second piston 46 to move upward and reset.

[0070] In this embodiment, through the cooperation of the variable diameter port 45 and the second piston 46, on the one hand, when the spray flow rate of the spray assembly 20 is sufficient, when the desulfurization slurry accumulates to a certain amount in the variable diameter port 45, the liquid pressure causes the second piston 46 to disengage from the variable diameter port 45, thereby accelerating the flow of the desulfurization slurry stored in the variable diameter port 45 into the collection cylinder 40 through the inlet gap formed between the second piston 46 and the end of the variable diameter port 45, thus continuing to generate liquid pressure on the first piston 43; on the other hand, when the spray flow rate of the spray assembly 20 is insufficient or decreases to a certain level... When the temperature is low, the amount of desulfurization slurry entering the variable diameter port 45 decreases, and the liquid pressure decreases, which is insufficient to continue to compress the second piston 46 and compress the spring column 461. The spring column 461 will push the second piston 46 upward to close the inlet gap formed between it and the end of the variable diameter port 45, thereby preventing the inlet flow into the collector cylinder 40. This can prevent the variable diameter port 45 from continuing to supply flow into the collector cylinder 40 when the spray flow of the spray assembly 20 is insufficient, thus preventing the desulfurization slurry from continuously dripping downward through the spray hole 41, disrupting the upward trajectory of the flue gas, and reducing the desulfurization effect of the desulfurization slurry.

[0071] like Figure 13 As shown, in another preferred embodiment of the present invention based on the above embodiments, a guide hole 431 is provided inside the first piston 43. The guide hole 431 penetrates the top wall and side wall of the first piston 43. When the first piston 43 is moved to the position of the nozzle 41, the guide hole 431 communicates with the nozzle 41 to form a fluid jet channel.

[0072] In this embodiment, the corresponding arrangement of the guide hole 431 and the spray hole 41 enables them to form a jet channel for the desulfurization slurry. The desulfurization slurry is accelerated after entering the narrow space of the guide hole 431 from the collector cylinder 40. The diameter of the guide hole 431 can be larger than the diameter of the spray hole 41 so that the desulfurization slurry in the guide hole 431 can completely enter the spray hole 41.

[0073] To increase the upward flow velocity of flue gas along the interior of the desulfurization tower 10, such as Figures 14-15As shown, in another embodiment of the present invention, the desulfurization tower body 10 is provided with an inner cylinder 15 coaxially below the spray assembly 20. The inner diameter of the inner cylinder 15 gradually decreases from both ends to the middle to form a Venturi structure, thereby accelerating the flow of flue gas in the inner cylinder 15.

[0074] like Figures 16-17 As shown, in the preferred embodiment provided by the above embodiments of the present invention, the inner cylinder 15 is made of elastic material, the wall thickness of the inner cylinder 15 gradually decreases from both sides to the middle, and the two ends of the inner cylinder 15 are sealed with the inner wall of the desulfurization tower body 10 to form a deformation cavity 16.

[0075] The desulfurization tower body 10 has an air inlet 17 on its side wall. When the deformation cavity 16 is filled with air through the air inlet 17, the middle area of ​​the inner cylinder 15 will deform first, so that it forms a cylindrical structure with an inner diameter that gradually decreases from both ends to the middle, thereby controlling the flow velocity of flue gas in the inner cylinder 15.

[0076] In this embodiment, the deformation cavity 16 allows the flexible inner cylinder 15 to adjust its deformation according to the amount of air filling the air inlet 17, and it is coordinated with the rotation speed of the guide vane 31. When a large amount of desulfurized flue gas needs to be discharged, the rotation speed of the guide vane 31 is increased, and the deformation cavity 16 is appropriately filled with air to shrink the inner cylinder 15. When it is necessary to introduce the flue gas to be desulfurized, the rotation speed of the guide vane 31 is reduced, and the deformation cavity 16 is vented to expand the inner cylinder 15 to accommodate more flue gas to be desulfurized.

[0077] To address the issue of the liquid curtain forming at the end of the flue gas inlet pipe 11, obstructing flue gas entry, as the waste liquid flows down the side wall of the desulfurization tower 10, such as... Figures 18-20 As shown, in another embodiment of the present invention, a plate 111 for guiding flue gas is provided inside the flue gas inlet pipe 11. The end of the plate 111 is provided with a guide outer edge 112 for receiving the desulfurization slurry falling from the inner wall of the desulfurization tower body 10 to the flue gas inlet pipe 11. The concave surface of the plate 111 is used to guide the flue gas, and the convex surface of the plate 111 is used to discharge the desulfurization slurry out of the flue gas inlet pipe 11.

[0078] In this embodiment, the arrangement of the tile plate 111 can guide the flue gas and desulfurization waste liquid respectively, and prevent the desulfurization waste liquid on the wall of the desulfurization tower 10 near the flue gas inlet pipe 11 from forming a liquid curtain that obstructs the upward movement of the flue gas.

[0079] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A magnesium-based flue gas desulfurization device, characterized in that, include: The desulfurization tower body (10) has a flue gas inlet pipe (11) for introducing flue gas at one end. The flue gas inlet pipe (11) is inclined to the central axis of the desulfurization tower body (10) and the opening is downward. The desulfurization tower body (10) has a flue gas outlet pipe (12) for discharging flue gas at the other end. The flue gas outlet pipe (12) is inclined to the central axis of the desulfurization tower body (10) and the opening is upward. A spray assembly (20) is disposed inside the desulfurization tower body (10). The spray assembly (20) provides the desulfurization slurry for absorbing sulfur dioxide in the flue gas to the inside of the desulfurization tower body (10). The spray assembly (20) includes spray heads (21) disposed on the inner wall of the desulfurization tower body (10). The spray heads (21) spray radially along the cross-section of the desulfurization tower body (10), thereby forming a spray surface inside the desulfurization tower body (10) for absorbing sulfur dioxide in the flue gas. A flow guiding component (30) is disposed inside the flue gas outlet pipe (12). The flow guiding component (30) is used to guide the flue gas inside the desulfurization tower body (10). The flow guiding component (30) includes a flow guiding swirl vane (31). A collection cylinder (40) is provided inside the desulfurization tower body (10) directly below the spray assembly (20). The collection cylinder (40) is provided on the mounting plate (13) and is coaxially arranged with the desulfurization tower body (10). The jets of the spray head (21) converge in the collection cylinder (40). The collector cylinder (40) has multiple spray holes (41) circumferentially arranged on its side wall near its inner bottom edge, so that the fluid inside the collector cylinder (40) can flow out along its circumference. In a unit time, the spray flow rate of the spray assembly (20) is greater than the discharge flow rate of the collector cylinder (40), so that the fluid inside the collector cylinder (40) accumulates and generates liquid pressure, so as to compress the fluid near the spray holes (41) to form a jet along the circumference of the collector cylinder (40) when it flows out. The bottom of the collector cylinder (40) is fixedly connected to the mounting plate (13), and a first piston (43) is coaxially provided inside the collector cylinder (40). The first piston (43) is disposed on the top edge of the collector cylinder (40) by at least two oppositely arranged elastic members (44). The first piston (43) can gradually move downward to the position of passing the nozzle (41) as the fluid in the collector cylinder (40) increases, so as to increase the flow velocity of the jet generated by the nozzle (41) by utilizing the fluid pressure in the collector cylinder (40). The opening end of the collector (40) narrows inward to form a variable diameter port (45), and a second piston (46) is provided inside the variable diameter port (45). The second piston (46) is connected to the first piston (43) via a spring column (461) below, so that the collector cylinder (40) has the following two working conditions as the spray assembly (20) starts and stops: First working condition: The spray assembly (20) starts to work. As the fluid in the variable diameter port (45) increases, the second piston (46) is compressed by the fluid pressure until the second piston (46) completely leaves the variable diameter port (45) area and forms a fluid inlet gap with the variable diameter port (45), so that the fluid rushes into the collection cylinder (40) at an accelerated speed. As the fluid pressure inside the collector cylinder (40) increases, the first piston (43) stretches the elastic element (44) downward due to the fluid pressure until the first piston (43) passes the nozzle (41). During this process, the first piston (43) gradually drives the bottom end of the spring column (461) to move downward until it recovers its deformation and then gradually drives the second piston (46) to move downward synchronously, so that the second piston (46) loses its obstruction effect on the fluid. Second operating condition: The spray assembly (20) stops working, the fluid no longer gathers in the collection cylinder (40), and after some fluid is discharged through the spray hole (41), the fluid pressure in the collection cylinder (40) decreases, and the elastic element (44) contracts, causing the first piston (43) to drive the second piston (46) to move upward and reset.

2. The magnesium-based flue gas desulfurization device according to claim 1, characterized in that, The first piston (43) has a guide hole (431) inside. The guide hole (431) passes through the top wall and side wall of the first piston (43). When the first piston (43) is moved to the position of the nozzle (41), the guide hole (431) and the nozzle (41) are connected to form a fluid jet channel.

3. The magnesium-based flue gas desulfurization device according to claim 1, characterized in that, The desulfurization tower body (10) has an inner cylinder (15) coaxially located below the spray assembly (20). The inner diameter of the inner cylinder (15) gradually decreases from both ends to the middle, thereby accelerating the flow of flue gas in the inner cylinder (15).

4. The magnesium-based flue gas desulfurization device according to claim 3, characterized in that, The inner cylinder (15) is made of elastic material, and the wall thickness of the inner cylinder (15) gradually decreases from both sides to the middle. The two ends of the inner cylinder (15) are sealed with the inner wall of the desulfurization tower body (10) to form a deformation cavity (16). The desulfurization tower body (10) has an air inlet (17) on its side wall. When the deformation cavity (16) is filled with air through the air inlet (17), the middle region of the inner cylinder (15) will deform first, so that it forms a cylindrical structure with an inner diameter that gradually decreases from both ends to the middle, thereby controlling the flow velocity of flue gas in the inner cylinder (15).

5. A magnesium-based flue gas desulfurization device according to claim 1, characterized in that, The flue gas inlet pipe (11) is provided with a tile plate (111) for guiding flue gas flow. The end of the tile plate (111) is provided with a guide outer edge (112) for receiving the desulfurization slurry falling from the inner wall of the desulfurization tower body (10) to the flue gas inlet pipe (11). The concave surface of the tile plate (111) is used to guide the flue gas, and the convex surface of the tile plate (111) is used to discharge the desulfurization slurry out of the flue gas inlet pipe (11).

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