An active demister for ammonia desulfurization, its usage method and application

Abstract

This invention belongs to the field of environmental protection equipment technology and discloses an active demister for ammonia desulfurization and its usage method. The demister includes multiple demister units arranged in parallel. Each demister unit includes a ventilation cylinder, a lower stationary blade, an upper stationary blade, and a moving blade assembly. The ventilation cylinder is a hollow cylinder with openings at the top and bottom and sealed on all sides. The lower stationary blade, upper stationary blade, and moving blade assembly are coaxially arranged vertically inside the hollow cavity of the ventilation cylinder. The lower stationary blade is fixedly connected to the bottom of the ventilation cylinder, and the moving blade assembly is located above the lower stationary blade. The moving blade assembly can rotate around its central axis. The upper stationary blade is connected to the moving blade assembly via a moving blade bearing, preventing the upper stationary blade from rotating with the moving blade assembly. This device enables the moving blade assembly to rotate in the opposite direction to the stationary blade guide under the upward-moving flue gas, increasing the relative velocity between the flue gas and the blades while reducing gas phase resistance, thus achieving a better demister effect.

Description

Technical Field

[0001] This invention belongs to the field of environmental protection equipment technology, and relates to a demisting device in a flue gas desulfurization absorption tower, especially an active demisting device for ammonia desulfurization and its usage method. Background Technology

[0002] In the field of flue gas desulfurization, especially ammonia-based desulfurization, the flue gas from wet desulfurization towers contains a significant amount of fine particulate matter and small droplets, which are typically removed using demisters. Traditional demisters, including ridge-type and cyclone-type demisters, rely on inertial force to separate gas from liquid and solid components. Most existing demisters are fixed structures, and improving demisting efficiency can only be achieved by increasing the gas velocity. Therefore, the relative velocity between the flue gas and the demister blades cannot reach higher requirements; otherwise, excessive resistance would increase the power consumption of the desulfurization system, leading to limited droplet removal efficiency. This results in only being able to remove larger particles larger than 10 micrometers, with low removal capacity for smaller particles below 10 micrometers. Consequently, the particulate matter emission concentration across the entire particle size range cannot meet the high standard requirement of less than 5 milligrams per cubic meter. Therefore, there is an urgent need to develop one or more new devices. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an active demister device, its usage method, and its application for ammonia desulfurization.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] An active demister for ammonia desulfurization includes one or more demister units, which are tightly connected and arranged in an absorption tower. Two or more demister units are arranged in parallel, ensuring that all flue gas can enter the parallel demister units.

[0006] The demisting unit includes a ventilator, a lower stationary blade, an upper stationary blade, and a moving blade assembly. The ventilator and the moving blade assembly are both arranged vertically, while the lower stationary blade and the upper stationary blade are arranged horizontally. The ventilator is a hollow cylinder with an open top and bottom and a sealed perimeter. The upper stationary blade, the moving blade assembly, and the lower stationary blade are arranged coaxially and at intervals from top to bottom in the hollow interior of the ventilator. The lower stationary blade is fixedly connected to the bottom of the ventilator. The moving blade assembly is located above the lower stationary blade and is close to and spaced apart from the inner wall of the ventilator. The moving blade assembly can rotate around the central axis of the ventilator. The upper stationary blade is connected to the moving blade assembly and is fixedly connected to the inner wall of the ventilator.

[0007] The flue gas can flow vertically upward from the bottom of the ventilation pipe. The lower stationary blade can cause the flue gas flowing vertically upward from the bottom of the ventilation pipe to rotate counterclockwise. The moving blade assembly can rotate clockwise under the action of the flue gas and can capture fine particles with a diameter of less than 10 micrometers in the flue gas. The upper stationary blade can cause the upward-flowing flue gas in the ventilation pipe to rotate counterclockwise.

[0008] Furthermore, the moving blade assembly includes a power moving blade, a central shaft, a moving blade bearing, and a supplementary moving blade. The central shaft and the moving blade bearing are arranged vertically, while the power moving blade and the supplementary moving blade are arranged horizontally. The power moving blade is coaxially fixed to the top of the central shaft, and the supplementary moving blade is coaxially fixed to the bottom of the central shaft. The moving blade bearing is coaxially fitted in the middle of the central shaft between the power moving blade and the supplementary moving blade. The upper stationary blade is connected to the central shaft through the moving blade bearing. The moving blade bearing can bear the operating load of the moving blade assembly, so that the upper stationary blade cannot rotate with the rotation of the moving blade assembly.

[0009] The replenishing blade includes a central blade cylinder and blades. The central blade cylinder is arranged vertically and coaxially with the ventilation cylinder. The blades are arranged horizontally at an angle and are evenly distributed along the circumference of the central blade cylinder. One end of each blade is fixedly mounted on the outer wall of the central blade cylinder, and the other end of each blade is close to and spaced apart from the inner wall of the ventilation cylinder. The central blade cylinder is coaxially and fixedly connected to the central shaft.

[0010] The power blade includes a power center cylinder and power blades. The power center cylinder is arranged vertically and coaxially with the ventilator. The power blades are inclined horizontally, and the inclination angle of the power blades in the horizontal direction is the same as that of the stationary blades in the horizontal direction. Multiple power blades are evenly distributed along the circumference of the power center cylinder. The power blades are fixedly mounted on the outer wall of the power center cylinder. The power center cylinder is coaxially and fixedly connected to the central shaft. The power blades are located above the top of the ventilator.

[0011] The upper and lower stationary blades have the same structure. Each upper and lower stationary blade includes a stationary blade and a stationary blade center cylinder. The stationary blade center cylinder is arranged vertically and coaxially with the ventilator. The stationary blades are arranged inclined horizontally and are evenly distributed along the circumference of the stationary blade center cylinder. One end of the stationary blade is fixed to the outer wall of the stationary blade center cylinder, and the other end of the stationary blade is fixed to the inner wall of the ventilator. The stationary blade center cylinder of the upper stationary blade is connected to the central shaft through a moving blade bearing.

[0012] The installation direction of multiple moving blades is opposite to that of multiple stationary blades;

[0013] A sealing plate is installed between adjacent demisting units. The sealing plate can seal the gap between adjacent demisting units, and by sealing the gap between the demisting units, the flue gas can be fully introduced into the parallel demisting units.

[0014] Furthermore, multiple moving blades are evenly distributed clockwise along the circumference of the moving blade center cylinder, and multiple stationary blades are evenly distributed counterclockwise along the circumference of the stationary blade center cylinder.

[0015] Furthermore, the ventilator is made of reinforced polypropylene, and the diameter of the ventilator is 200mm-1000mm; or, the stationary blade is a flat thin sheet, the thickness of the stationary blade is 1-20mm, the angle between the stationary blade and the horizontal plane is 10-60°, and the material of the stationary blade is reinforced polypropylene.

[0016] Furthermore, the stationary blade is configured as a fan-shaped structure, with two blade protrusions symmetrically arranged on the fan-shaped sides of the stationary blade away from the center cylinder. The blade protrusions protrude toward the inner wall of the ventilator. The stationary blade is fixedly connected to the inner wall of the ventilator through the blade protrusions, and a droplet channel is formed between the two blade protrusions, the stationary blade, and the inner wall of the ventilator.

[0017] Furthermore, the moving blade is configured as a fan-shaped structure, and a bent guide portion is connected to one side of the moving blade along the circumferential direction. The bent guide portion is convex downward in the vertical direction. Multiple guide grooves are evenly distributed radially on the lower surface of the moving blade inside the bent guide portion. The guide grooves are arranged vertically, and the lower surface of the moving blade is recessed upward. The depth of the guide grooves in the vertical direction is less than the thickness of the moving blade. The two sides of the fan-shaped moving blade are circumferentially tangent to the outer wall of the moving blade center cylinder.

[0018] Furthermore, the height of the bent guide section in the vertical direction is 1-20mm, and the guide groove is provided with 1-5 grooves; or, the moving blade is a flat thin sheet made of reinforced polypropylene, the thickness of the moving blade is 1-20mm, and the angle between the moving blade and the horizontal plane is 10-60°.

[0019] Furthermore, drainage holes are provided on the outer arc-shaped edge of the fan-shaped moving blade, or two blade protrusions are symmetrically provided on the two fan-shaped sides of the moving blade away from the moving blade center cylinder. The blade protrusions protrude toward the inner wall of the ventilation cylinder. The two blade protrusions are spaced apart from and close to the ventilation cylinder. A droplet channel is also formed between the two blade protrusions, the moving blade, and the inner wall of the ventilation cylinder.

[0020] Furthermore, the power blade is configured as a propeller structure, or the angle between the power blade and the horizontal plane is 10-60°.

[0021] The method of using the active demister for ammonia desulfurization as described above includes the following steps:

[0022] (1) The flue gas to be treated flows into the demister from bottom to top. The flue gas enters the ventilation cylinder and flows vertically upward. When it reaches the lower stationary blade, the flue gas rotates counterclockwise under the guiding action of the lower stationary blade.

[0023] (2) As the flue gas continues to flow upward, the power blades begin to rotate clockwise under the action of the flue gas, and the power blades drive the central shaft and the supplementary blades to rotate together;

[0024] (3) When the counterclockwise rising flue gas reaches the position of the collecting blade, it comes into contact with the clockwise rotating collecting blade. The droplets carried in the flue gas agglomerate upon contact with the collecting blade. The fine particles collide with the agglomerated droplets and are captured by the liquid tension. The agglomerated droplets flow along the bends and guide grooves set on the blade and flow towards the hole between the blade and the ventilation cylinder under centrifugal force, and finally flow down along the ventilation cylinder.

[0025] (4) After passing through the replenishing moving blades, the flue gas changes to a clockwise rotating upward motion. When it comes into contact with the upper stationary blades, it receives the opposite rotating flow again, forming another collision replenishment process.

[0026] (5) The flue gas continues to rise and flows through the position of the power blade, which drives the power blade to rotate clockwise, causing the central shaft and the auxiliary moving blade to rotate clockwise together, and the flue gas is finally discharged upward.

[0027] The above-mentioned active demister for ammonia desulfurization is applied in the process of demisting ammonia desulfurization.

[0028] The advantages and positive effects of this invention are as follows:

[0029] 1. This demister device includes a demister unit, which comprises a ventilation cylinder, lower stationary blades, upper stationary blades, and a moving blade assembly. These demister units are tightly connected and installed within the absorption tower, ensuring that all flue gas can enter the parallel demister units. The flue gas flows vertically upwards from the bottom of the ventilation cylinder. The lower stationary blades cause the upward-flowing flue gas to rotate counter-clockwise. The moving blade assembly, propelled by the flue gas, rotates clockwise and captures fine particulate matter smaller than 10 micrometers in the flue gas. The upper stationary blades cause the upward-flowing flue gas within the ventilation cylinder to rotate counter-clockwise, achieving a better demister effect. Furthermore, this device is used to remove droplets and fine particulate matter from the flue gas emitted from wet desulfurization absorption towers, and is particularly suitable for removing fine particulate matter and aerosols in ammonia desulfurization absorption towers, solving the problem of low efficiency in traditional demisters.

[0030] 2. This demisting device includes multiple demisting units connected in parallel inside the absorption tower. A flat plate is installed between adjacent demisting units to seal the gaps between them, ensuring that all flue gas can enter the parallel demisting units. The demisting unit employs a rotating blade assembly, utilizing the dynamic pressure of the rising flue gas to drive the rotating blades. These blades, in turn, drive the entire rotating blade assembly to rotate. The tilt direction of the driving blades is consistent with that of the stationary blades, enabling the rotating blade assembly to achieve a rotation direction opposite to that of the stationary blades under the upward-moving flue gas flow. This increases the relative velocity between the flue gas and the blades while reducing gas phase resistance, resulting in a better demisting effect.

[0031] 3. This invention utilizes the dynamic pressure of rising flue gas to drive the rotation of the power blades, which in turn drive the entire moving blade assembly to rotate. The tilt direction of the power blades is consistent with that of the stationary blades, enabling the moving blade assembly to obtain a rotation direction opposite to that of the stationary blades under the upward push of the flue gas. The supplementary moving blades are provided with aerodynamic bends and grooves, providing a flow direction for local gas-liquid separation, enabling better separation of gas and liquid in the flue gas. The end face of the supplementary moving blades is provided with drainage holes, allowing the separated liquid to be discharged smoothly, reducing secondary entrainment and improving the demisting effect. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structural connection of the defogging unit in this invention;

[0033] Figure 2 for Figure 1 A schematic diagram of a structural connection of the central moving blade assembly;

[0034] Figure 3 for Figure 1 A schematic diagram of a structural connection between the upper and lower stationary blades;

[0035] Figure 4for Figure 1 A schematic diagram of a structural connection of the central auxiliary moving blade. Detailed Implementation

[0036] The present invention will be further described below with reference to the embodiments. The following embodiments are descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0037] The various experimental operations involved in the specific embodiments are all conventional techniques in the field. For parts not specifically annotated in this document, those skilled in the art can refer to various commonly used reference books, scientific and technological documents or related instructions and manuals prior to the filing date of this invention to carry out the operations.

[0038] An active demister for ammonia desulfurization, such as Figures 1 to 4 As shown, the demisting device includes one or more demisting units, which are tightly connected and arranged in the absorption tower (not shown in the figure). Two or more demisting units are arranged in parallel, which are tightly connected and arranged in the absorption tower to ensure that all the flue gas can enter the parallel demisting units.

[0039] The demisting unit includes a ventilator 1, a lower stationary blade 2, an upper stationary blade 4, and a moving blade assembly 3. The ventilator and the moving blade assembly are both arranged vertically, while the lower stationary blade and the upper stationary blade are arranged horizontally. The ventilator is a hollow cylinder with an open top and bottom and a sealed perimeter. The upper stationary blade, the moving blade assembly, and the lower stationary blade are arranged coaxially and at intervals from top to bottom in the hollow interior of the ventilator. The lower stationary blade is fixedly connected to the bottom of the ventilator. The moving blade assembly is located above the lower stationary blade and is close to and spaced apart from the inner wall of the ventilator. The moving blade assembly can rotate around the central axis of the ventilator. The upper stationary blade is connected to the moving blade assembly and is fixedly connected to the inner wall of the ventilator.

[0040] The flue gas can flow vertically upward from the bottom of the ventilation pipe. The lower stationary blade can cause the flue gas flowing vertically upward from the bottom of the ventilation pipe to rotate counterclockwise. The moving blade assembly can rotate clockwise under the action of the flue gas and can capture fine particles with a diameter of less than 10 micrometers in the flue gas. The upper stationary blade can cause the upward-flowing flue gas in the ventilation pipe to rotate counterclockwise.

[0041] This demisting device includes a demisting unit, which comprises a ventilation cylinder, lower stationary blades, upper stationary blades, and a moving blade assembly. These units are tightly connected and installed within the absorption tower, ensuring that all flue gas can enter the parallel demisting units. The flue gas flows vertically upwards from the bottom of the ventilation cylinder. The lower stationary blades cause the upward-flowing flue gas to rotate counter-clockwise. The moving blade assembly, propelled by the flue gas, rotates clockwise and captures fine particulate matter smaller than 10 micrometers in the flue gas. The upper stationary blades cause the upward-flowing flue gas within the ventilation cylinder to rotate counter-clockwise, achieving a better demisting effect. Furthermore, this device is used to remove droplets and fine particulate matter from the flue gas emitted from wet desulfurization absorption towers, and is particularly suitable for removing fine particulate matter and aerosols in ammonia desulfurization absorption towers, solving the problem of low efficiency in traditional demisters.

[0042] In this embodiment, the moving blade assembly includes a power moving blade 7, a central shaft 6, a moving blade bearing 10, and a supplementary moving blade 5. The central shaft and the moving blade bearing are arranged vertically, while the power moving blade and the supplementary moving blade are arranged horizontally. The power blade is coaxially fixed to the top of the central shaft, and the supplementary moving blade is coaxially fixed to the bottom of the central shaft. The moving blade bearing is coaxially fitted in the middle of the central shaft between the power moving blade and the supplementary moving blade. The upper stationary blade is connected to the central shaft through the moving blade bearing. The moving blade bearing can bear the operating load of the moving blade assembly, so that the upper stationary blade cannot rotate with the rotation of the moving blade assembly.

[0043] The replenishing blade includes a blade center cylinder 11 and blades 12. The blade center cylinder is arranged vertically and coaxially with the ventilation cylinder. The blades are arranged horizontally and are evenly distributed along the circumference of the blade center cylinder. One end of the blade is fixedly mounted on the outer wall of the blade center cylinder, and the other end of the blade is close to and spaced apart from the inner wall of the ventilation cylinder. The blade center cylinder is coaxially and fixedly connected to the central shaft.

[0044] The power blade includes a power center cylinder 701 and a power blade 702. The power center cylinder is arranged vertically and coaxially with the ventilator. The power blade is inclined horizontally, and the inclination angle of the power blade in the horizontal direction is the same as that of the stationary blade in the horizontal direction. Multiple power blades are evenly distributed along the circumference of the power center cylinder. The power blades are fixedly mounted on the outer wall of the power center cylinder. The power center cylinder is coaxially and fixedly connected to the central shaft. The power blades are located above the top of the ventilator.

[0045] The upper and lower stationary blades have the same structure. Each upper and lower stationary blade includes a stationary blade 8 and a stationary blade center cylinder 9. The stationary blade center cylinder is arranged vertically and coaxially with the ventilator. The stationary blades are arranged inclined horizontally and are evenly distributed along the circumference of the stationary blade center cylinder. One end of the stationary blade is fixed to the outer wall of the stationary blade center cylinder, and the other end of the stationary blade is fixed to the inner wall of the ventilator. The stationary blade center cylinder of the upper stationary blade is connected to the central shaft through a moving blade bearing.

[0046] The installation direction of multiple moving blades is opposite to that of multiple stationary blades;

[0047] A sealing plate (not shown in the figure) is provided between adjacent demisting units. The sealing plate can seal the gap between adjacent demisting units. By sealing the gap between the demisting units with the sealing plate, it is ensured that the flue gas can enter the parallel demisting units.

[0048] This demister includes a demister unit, which comprises a ventilation cylinder, lower stationary blades, upper stationary blades, and a moving blade assembly. Multiple demister units are connected in parallel within the absorption tower, with flat plates separating adjacent units to seal any gaps and ensure complete access of the flue gas. The demister unit utilizes a rotating blade assembly, where the dynamic pressure of the rising flue gas drives the rotating blades, which in turn rotate the entire moving blade assembly. The tilt direction of the rotating blades aligns with that of the stationary blades, allowing the moving blade assembly to rotate in the opposite direction to the stationary blade flow under the upward pressure of the flue gas. This increases the relative velocity between the flue gas and the blades, reduces gas phase resistance, and achieves better demister performance. Furthermore, this device is used to remove droplets and fine particulate matter from the flue gas emitted from wet desulfurization absorption towers, and is particularly suitable for removing fine particulate matter and aerosols in ammonia desulfurization absorption towers, solving the problem of low efficiency in traditional demisters.

[0049] In this embodiment, multiple moving blades are evenly distributed clockwise along the circumference of the moving blade center cylinder, and multiple stationary blades are evenly distributed counterclockwise along the circumference of the stationary blade center cylinder.

[0050] In this embodiment, the ventilator is made of reinforced polypropylene. Preferably, the diameter of the ventilator is 200mm-1000mm.

[0051] In this embodiment, the stationary blade is a flat thin sheet made of reinforced polypropylene. The excellent stability, durability, and reliability of reinforced polypropylene enable the lightweight design of the device.

[0052] Preferably, the thickness of the still blade is 1-20 mm.

[0053] Preferably, the angle between the stationary blade and the horizontal plane is 10-60°.

[0054] In this embodiment, the stationary blade is configured as a fan-shaped structure. Two blade protrusions 15 are symmetrically arranged on both sides of the fan-shaped section of the stationary blade away from the center cylinder. These protrusions extend towards the inner wall of the ventilation cylinder. The stationary blade is fixedly connected to the inner wall of the ventilation cylinder via these blade protrusions, forming a droplet channel between the two blade protrusions, the stationary blade, and the inner wall of the ventilation cylinder. The connection between the stationary blade and the ventilation cylinder is a hollow connection. The stationary blade is fixed by the blade protrusions, creating a cavity (droplet channel) at the connection point, facilitating the flow of captured droplets along this channel.

[0055] In this embodiment, the moving blade is configured as a fan-shaped structure. A bent guide section 13 is connected to the lower side of one side of the moving blade along the circumferential direction. The bent guide section protrudes downward in the vertical direction. Multiple guide grooves 14 are evenly distributed radially on the lower surface of the moving blade inside the bent guide section. The guide grooves are arranged vertically, and the lower surface of the moving blade is recessed upward. The depth of the guide grooves in the vertical direction is less than the thickness of the moving blade. The two sides of the fan-shaped moving blade are circumferentially tangent to the outer wall of the moving blade center cylinder, which enhances the separation effect. The supplementary moving blade is provided with aerodynamically conforming bent guide sections and guide grooves, which provide the flow direction for local gas-liquid separation, so that the gas and liquid in the flue gas can be better separated.

[0056] Preferably, the height of the bent guide section in the vertical direction is 1-20mm, or the guide groove is provided with 1-5 grooves.

[0057] Preferably, the moving blade is a planar thin sheet made of reinforced polypropylene.

[0058] Alternatively, the thickness of the moving blade is 1-20 mm.

[0059] Preferably, a drainage hole (not shown in the figure) is provided on the outer arc edge of the fan-shaped blade. The drainage hole allows the separated liquid to be discharged smoothly, reducing secondary entrainment and improving the demisting effect.

[0060] Preferably, two blade protrusions 16 are symmetrically arranged on both fan-shaped sides of the moving blade, away from the central cylinder of the moving blade. The blade protrusions bulge towards the inner wall of the ventilation cylinder. The two blade protrusions are spaced apart from and close to the ventilation cylinder, forming a droplet channel between the two blade protrusions, the moving blade, and the inner wall of the ventilation cylinder. The two blade protrusions create a cavity between the moving blade and the ventilation cylinder, facilitating the flow of captured droplets along the droplet channel.

[0061] Preferably, the angle between the moving blade and the horizontal plane is 10-60°.

[0062] In this embodiment, the power blade is configured as a propeller structure, or the angle between the power blade and the horizontal plane is 10-60°. The dynamic pressure of the rising flue gas drives the power blade to rotate, which in turn drives the entire moving blade assembly to rotate. The tilt direction of the power blade is consistent with that of the stationary blade, enabling the moving blade assembly to obtain a rotation direction opposite to that of the stationary blade under the upward thrust of the flue gas.

[0063] The method of using the active demister for ammonia desulfurization as described above includes the following steps:

[0064] 1. The flue gas to be treated flows into the demister from bottom to top. The flue gas enters the ventilation cylinder and flows vertically upward. When it reaches the lower stationary blade, the flue gas rotates counterclockwise under the guiding action of the lower stationary blade.

[0065] 2. As the flue gas continues to flow upward, the powered blades begin to rotate clockwise under the action of the flue gas, and the powered blades drive the central shaft and the supplementary blades to rotate together;

[0066] 3. When the counterclockwise rising flue gas reaches the position of the collecting blade, it comes into contact with the clockwise rotating collecting blade. The droplets carried in the flue gas agglomerate upon contact with the collecting blade. The fine particles are captured by the liquid tension after colliding with the agglomerated droplets. The agglomerated droplets flow along the bends and guide grooves set on the blade, and under the centrifugal force, they flow into the hole between the blade and the ventilation cylinder, and finally flow down along the ventilation cylinder.

[0067] 4. After passing through the replenishing moving blades, the flue gas changes to a clockwise rotating upward motion. When it comes into contact with the upper stationary blades, it receives the opposite rotating flow again, forming another collision replenishment process.

[0068] 5. The flue gas continues to rise, flows past the position of the power blade, and drives the power blade to rotate clockwise, which in turn drives the central shaft and the auxiliary moving blade to rotate clockwise together, and the flue gas is finally discharged upward.

[0069] The active demister described above for ammonia desulfurization can be applied to demistering in ammonia desulfurization.

[0070] Working principle of an active demister for ammonia desulfurization:

[0071] Taking the direction shown in the attached figure as an example, the rotation direction is observed from top to bottom.

[0072] When the device is started, the moving blade assembly is stationary. As a stable flow field is established, the powered moving blade begins to rotate under the action of flue gas, driving the central shaft and the supplementary moving blade to rotate together. The installation angles of the moving blades of the powered moving blade and the supplementary moving blade (i.e., the installation directions along the circumference are different) are designed differently to ensure that the clockwise torque generated by the flue gas driving the powered moving blade is greater than the counterclockwise torque generated by the supplementary moving blade, thereby realizing the clockwise movement of the moving blade assembly as a whole.

[0073] The flue gas to be treated flows upwards into the demister, enters the ventilation cylinder and flows vertically upwards to the lower stationary blade. The lower stationary blade is a fixed structure that guides the flue gas, causing it to rotate counterclockwise. When the counterclockwise rising flue gas reaches the collecting moving blade, it comes into contact with the clockwise rotating collecting moving blade. The liquid droplets carried in the flue gas agglomerate upon contact with the collecting moving blade. Fine particles collide with the agglomerated droplets and are captured by liquid surface tension. The agglomerated droplets flow along the bends and guide grooves on the moving blade and, under centrifugal force, flow towards the holes between the moving blade and the ventilation cylinder, eventually flowing down the ventilation cylinder. The relative movement between the lower stationary blade and the moving blade assembly creates a high relative velocity between the flue gas and the collecting moving blade, thus achieving a greater gas-liquid and gas-solid separation effect. After passing the collecting blades, the flue gas flows upward, its rotational speed decreasing or changing to clockwise rotation as it rises. Upon contact with the upper stationary blades, it receives reverse rotational guidance, forming another collision-collection process. The flue gas continues to rise, flowing past the position of the driving blades, pushing them to rotate clockwise. This causes the central shaft and the collecting blades to rotate clockwise together, and the flue gas is finally discharged upward.

[0074] Specifically, the relevant test results are as follows:

[0075]

[0076] Existing technologies can only remove larger particles with a diameter of 10 micrometers or more, and their removal capacity for smaller particles with a diameter of less than 10 micrometers is low. Furthermore, the emission concentration of particulate matter across the entire particle size range cannot meet the high standard requirement of less than 5 milligrams per cubic meter. However, the present invention achieves removal rates of 96.14%, 99.53%, and 100% for 10-micrometer droplets on the lower stationary leaf, the supplementary moving leaf, and the upper stationary leaf, respectively; 78.68%, 95.76%, and 97.2% for 5-micrometer droplets, respectively; and 65.87%, 89.36%, and 93.17% for 1-micrometer droplets, respectively. The effects are significant and the advantages are obvious.

[0077] Although embodiments of the invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations, and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the scope of the invention is not limited to the contents disclosed in the embodiments.

Claims

1. An active demister for ammonia desulfurization, characterized in that: The demisting device includes one or more demisting units, which are tightly connected and arranged inside the absorption tower; two or more demisting units are arranged in parallel, and are tightly connected and arranged inside the absorption tower. The demisting unit includes a ventilator, a lower stationary blade, an upper stationary blade, and a moving blade assembly. The ventilator and moving blade assembly are both vertically oriented, while the lower and upper stationary blades are horizontally oriented. The ventilator is a hollow cylinder with openings at the top and bottom and sealed on all sides. The upper stationary blade, moving blade assembly, and lower stationary blade are arranged coaxially and at intervals from top to bottom within the hollow interior of the ventilator. The lower stationary blade is fixedly connected to the bottom of the ventilator. The moving blade assembly is positioned above the lower stationary blade and close to and spaced from the inner wall of the ventilator. The moving blade assembly is rotatable around the central axis of the ventilator. The upper stationary blade is connected to the moving blade assembly and is also fixedly connected to the inner wall of the ventilator. The flue gas can flow vertically upward from the bottom of the ventilation cylinder. The lower stationary blade can cause the flue gas flowing vertically upward from the bottom of the ventilation cylinder to rotate counterclockwise. The moving blade assembly can rotate clockwise under the action of the flue gas and can capture fine particulate matter with a particle size of less than 10 micrometers in the flue gas. The upper stationary blade can cause the upward-flowing flue gas in the ventilation cylinder to rotate counterclockwise. The moving blade assembly includes a power moving blade and a supplementary moving blade. The power moving blade includes a power blade, and the tilting direction of the power blade is consistent with that of the stationary blade. The supplementary moving blade includes a moving blade, and the installation direction of the plurality of moving blades is opposite to that of the plurality of stationary blades.

2. The active demister for ammonia desulfurization according to claim 1, characterized in that: The moving blade assembly also includes a central shaft and a moving blade bearing. The central shaft and the moving blade bearing are arranged vertically, while the power moving blade and the supplementary moving blade are arranged horizontally. The power blade is coaxially fixed to the top of the central shaft, and the supplementary moving blade is coaxially fixed to the bottom of the central shaft. The moving blade bearing is coaxially fitted in the middle of the central shaft between the power moving blade and the supplementary moving blade. The upper stationary blade is connected to the central shaft through the moving blade bearing. The moving blade bearing can bear the operating load of the moving blade assembly, so that the upper stationary blade cannot rotate with the rotation of the moving blade assembly. The replenishing blade also includes a blade center cylinder, which is arranged vertically and coaxially with the ventilation cylinder. The blades are arranged horizontally at an inclination and are evenly distributed along the circumference of the blade center cylinder. One end of the blade is fixedly mounted on the outer wall of the blade center cylinder, and the other end of the blade is close to and spaced apart from the inner wall of the ventilation cylinder. The blade center cylinder is coaxially and fixedly connected to the central shaft. The power blade also includes a power center cylinder, which is arranged vertically and coaxially with the ventilator. The power blade is inclined horizontally, and the inclination angle of the power blade in the horizontal direction is the same as that of the stationary blade in the horizontal direction. Multiple power blades are evenly distributed along the circumference of the power center cylinder. The power blades are fixedly mounted on the outer wall of the power center cylinder. The power center cylinder is coaxially and fixedly connected to the central shaft. The power blades are located above the top of the ventilator. The upper and lower stationary blades have the same structure. Each upper and lower stationary blade includes a stationary blade and a stationary blade center cylinder. The stationary blade center cylinder is arranged vertically and coaxially with the ventilator. The stationary blades are arranged inclined horizontally and are evenly distributed along the circumference of the stationary blade center cylinder. One end of the stationary blade is fixed to the outer wall of the stationary blade center cylinder, and the other end of the stationary blade is fixed to the inner wall of the ventilator. The stationary blade center cylinder of the upper stationary blade is connected to the central shaft through a moving blade bearing. A sealing plate is provided between adjacent demisting units, which can seal the gap between adjacent demisting units.

3. The active demister for ammonia desulfurization according to claim 2, characterized in that: Multiple moving blades are evenly distributed clockwise along the circumference of the moving blade center tube, and multiple stationary blades are evenly distributed counterclockwise along the circumference of the stationary blade center tube.

4. The active demister for ammonia desulfurization according to claim 2, characterized in that: The ventilator is made of reinforced polypropylene and has a diameter of 200mm-1000mm; or, the stationary blade is a flat thin sheet with a thickness of 1-20mm, an angle of 10-60° between the stationary blade and the horizontal plane, and is made of reinforced polypropylene.

5. The active demister for ammonia desulfurization according to claim 2, characterized in that: The stationary blade is configured as a fan-shaped structure. Two blade protrusions are symmetrically arranged on the two sides of the fan-shaped stationary blade away from the center cylinder. The blade protrusions protrude towards the inner wall of the ventilation cylinder. The stationary blade is fixedly connected to the inner wall of the ventilation cylinder through the blade protrusions. A droplet channel is formed between the two blade protrusions, the stationary blade and the inner wall of the ventilation cylinder.

6. The active demister for ammonia desulfurization according to claim 2, characterized in that: The moving blade is configured as a fan-shaped structure, with drainage holes provided on the outer arc edge of the fan-shaped moving blade. Alternatively, two blade protrusions are symmetrically arranged on both sides of the fan-shaped moving blade away from the moving blade center cylinder. The blade protrusions protrude towards the inner wall of the ventilation cylinder. The two blade protrusions are spaced apart from and close to the ventilation cylinder, and a droplet channel is formed between the two blade protrusions, the moving blade, and the inner wall of the ventilation cylinder. Alternatively, the power blade is configured as a propeller structure, with the angle between the power blade and the horizontal plane being 10-60°.

7. The active demister for ammonia desulfurization according to any one of claims 2 to 6, characterized in that: A bent guide section is connected to one side of the moving blade along the circumferential direction, and the bent guide section is convex downward in the vertical direction; multiple guide grooves are evenly distributed radially on the lower surface of the moving blade inside the bent guide section, and the guide grooves are arranged vertically, and the lower surface of the moving blade is recessed upward, and the depth of the guide grooves in the vertical direction is less than the thickness of the moving blade; the two fan-shaped sides of the moving blade are circumferentially tangent to the outer wall of the moving blade center cylinder.

8. The active demister for ammonia desulfurization according to claim 7, characterized in that: The vertical height of the bent guide section is 1-20mm, and the guide groove is provided with 1-5 grooves; or, the moving blade is a flat thin sheet made of reinforced polypropylene, the thickness of the moving blade is 1-20mm, and the angle between the moving blade and the horizontal plane is 10-60°.

9. The method of using the active demister for ammonia desulfurization as described in claim 8, characterized in that: Includes the following steps: (1) The flue gas to be treated flows into the demister from bottom to top. The flue gas enters the ventilation cylinder and flows vertically upward. When it reaches the lower stationary blade, the flue gas rotates counterclockwise under the guiding action of the lower stationary blade. (2) As the flue gas continues to flow upward, the power blades begin to rotate clockwise under the action of the flue gas, and the power blades drive the central shaft and the supplementary blades to rotate together; (3) When the counterclockwise rising flue gas reaches the position of the replenishing moving blade, it comes into contact with the clockwise rotating replenishing moving blade. The droplets carried in the flue gas agglomerate upon contact with the replenishing moving blade. After the fine particles collide with the agglomerated droplets, they are captured by the liquid tension. The agglomerated droplets flow along the bends and guide grooves set on the moving blade, and under the centrifugal force, they flow to the hole between the moving blade and the ventilation cylinder, and finally flow down along the ventilation cylinder. (4) After passing through the replenishing moving blades, the flue gas changes to a clockwise rotating upward motion. When it comes into contact with the upper stationary blades, it receives the opposite rotating flow again, forming another collision replenishment process. (5) The flue gas continues to rise, flows through the position of the power blade, and drives the power blade to rotate clockwise, which in turn drives the central shaft and the auxiliary moving blade to rotate clockwise together, and the flue gas is finally discharged upward.

10. The application of the active demister for ammonia desulfurization as described in any one of claims 1 to 8 in the field of ammonia desulfurization and demistering.

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