Density separation device

Abstract

This invention discloses a concentration-degradation separation device, comprising: a bent tube body, a flow guiding component, a separation component, and a concentration component. The flow guiding component includes a first flow guide plate and a second flow guide plate, defining a converging channel whose cross-sectional area gradually decreases from upstream to downstream. The separation component includes a rotating shaft and a partition plate, defining a concentrated phase branch channel connected to the converging channel. The concentration component is connected to the bent tube body and has a concentration channel, a gas chamber, and a vent. The concentration channel is connected to the concentrated phase branch channel, and its peripheral wall has multiple filter holes. The concentration channel is connected to the gas chamber via the filter holes, and the vent is also connected to the gas chamber. The flow guiding component enhances powder enrichment. The partition plate adjusts the flow rate and solid-to-gas ratio of the concentrated phase branch, and the concentration component fine-tunes the concentration of the concentrated phase branch, further enhancing the concentration effect of the separator.

Description

Technical Field

[0001] This invention relates to the field of burner technology, and more particularly to a concentrated-lean separation device. Background Technology

[0002] Pneumatic conveying is a common method for transporting powders in industry. In combustion applications, increasing the concentration of powders (such as pulverized coal) is beneficial for burner ignition and stable combustion. However, the solid-to-gas ratio in the conveying air of traditional power plant boilers is relatively low. Related technologies utilize the inertia of the powder, using a bend-type separator to enrich the powder on the outside of the bend, and then separating the high- and low-concentration two-phase flows using baffles. The denser phase stream is then connected to the burner to improve combustion efficiency and stability. However, the powder enrichment area after the bend is not sufficiently concentrated, and the concentrations of the separated dense and dilute phase streams are fixed and cannot be adjusted. Furthermore, since the baffles used to separate the dense and dilute phase streams face the incoming flow direction of the gas-solid two-phase flow, wear and powder deposition problems arise. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a concentration-degradation separation device, which has the characteristics of good concentration effect and precise control of gas flow rate and powder flow rate on the concentrated phase side.

[0005] The concentration-depreciation separation device of this invention includes: a bent tube body, a flow guiding assembly, a separation assembly, and a concentration assembly. The flow guiding assembly includes a first flow guiding plate and a second flow guiding plate, both of which are disposed on the inner wall of the bent tube body located on the outer side. The first flow guiding plate includes a first tapered section and a first straight section connected together, and the second flow guiding plate includes a second tapered section and a second straight section connected together. The first tapered section and the second tapered section together define a collecting channel, the cross-sectional area of ​​which gradually decreases from upstream to downstream. The separation assembly includes a rotating shaft and a separator. A plate, the partition plate being rotatably disposed between the first straight section and the second straight section via the rotating shaft, the partition plate, the first straight section, the second straight section, and the inner wall of the bent pipe body together define a dense phase branch channel, the dense phase branch channel being connected to the collecting channel, the concentration component being connected to the bent pipe body, the concentration component having a concentration channel, a gas chamber, and a vent hole, the concentration channel being connected to the dense phase branch channel, the peripheral wall of the concentration channel being provided with multiple filter holes, the concentration channel being connected to the gas chamber via the filter holes, and the vent hole being connected to the gas chamber.

[0006] The concentration separation device of this invention, through the guiding and converging effect of the flow guiding component, makes the powder enrichment area at the separator outlet of this invention more concentrated. By rotating the partition plate to adjust the flow rate and solid-gas ratio of the concentrated phase branch, the problem of fixed concentrations of the concentrated and dilute phase branches after separation in related technologies is solved. Furthermore, by fine-tuning the concentration of the concentrated phase branch through the concentration enhancement component, the concentration enhancement effect of the separator of this invention is further enhanced.

[0007] In some embodiments, the first guide plate and the second guide plate are symmetrically arranged on both sides of the central axis of the bend body in a first direction.

[0008] In some embodiments, the bend body includes a bend portion and a straight portion connected together, wherein the first tapered section and the second tapered section are both located within the bend portion, and the first straight section and the second straight section are both located within the straight portion.

[0009] In some embodiments, the line connecting the upstream end of the bend to the center of the bend is L1, the line connecting the upstream end of the first tapered section to the center of the bend is L2, and the included angle between L1 and L2 is α, where 20° < α < 55°.

[0010] In some embodiments, the downstream end of the first tapered section is flush with the downstream end of the bend, the upstream end of the first straight section is flush with the upstream end of the straight section, and the downstream end of the first straight section is flush with the downstream end of the straight section.

[0011] In some embodiments, the partition plate is provided with a first air blowing channel extending along the length direction of the partition plate. The first air blowing channel has a first air inlet end and a first air outlet end. The first air outlet end is located on the end face of the partition plate near the converging channel. A first diverting block is provided at the first air outlet end, which divides the first air outlet end into a first nozzle and a second nozzle. The extension direction of the first nozzle is parallel to the extension direction of the first air blowing channel, and the extension direction of the second nozzle has an angle with the extension direction of the first air blowing channel.

[0012] In some embodiments, the partition plate is further provided with a second air blowing channel extending along the length direction of the partition plate. The second air blowing channel has a second air inlet and a second air outlet. The second air outlet is located on the end face of the partition plate near the collecting channel. A second diverting block is provided at the second air outlet. The second diverting block and the first diverting block are distributed opposite to each other along the thickness direction of the partition plate. The second diverting block divides the second air outlet into a third nozzle and a fourth nozzle. The extension direction of the third nozzle is parallel to the extension direction of the second air blowing channel, and the extension direction of the fourth nozzle has an angle with the extension direction of the second air blowing channel.

[0013] In some embodiments, the cross-sectional area of ​​the first nozzle is smaller than that of the second nozzle, and the cross-sectional area of ​​the third nozzle is smaller than that of the fourth nozzle.

[0014] In some embodiments, the rotating shaft is provided with an air injection hole, and the first air inlet end and the second air inlet end are respectively connected to the air injection hole. The separation component further includes an air path switching switch, which is rotatably disposed in the air injection hole. The air path switching switch is used to control the connection and disconnection between the first air inlet end or the second air inlet end and the air injection hole.

[0015] In some embodiments, a limiting plate is further included, which is disposed between the first straight section and the second straight section. The limiting plate is located outside the dense phase branch channel and is used to limit the rotation angle of the partition plate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the separator outlet of a related technology.

[0017] Figure 2 This is a schematic diagram of the outlet of the concentration-depression separation device according to an embodiment of the present invention.

[0018] Figure 3 This is a first schematic diagram of the concentration-degradation separation device according to an embodiment of the present invention.

[0019] Figure 4 This is a second schematic diagram of the concentration-degradation separation device according to an embodiment of the present invention.

[0020] Figure 5 This is a cross-sectional schematic diagram of the concentration separation device according to an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the flow guiding component and the separation component of the concentration separation device according to an embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of the separation component of the concentration-degradation separation device according to an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the airflow distribution when the first blowing channel of the concentration-degradation separation device of this invention is opened.

[0024] Figure 9 yes Figure 8 An enlarged schematic diagram of part A in the middle.

[0025] Figure label:

[0026] 1. Bend body 11. Bend section 12. Straight section 13.

[0027] Flow guiding assembly 2, first flow guiding plate 21, first tapering section 211, first straight section 212, second flow guiding plate 22, second tapering section 221, second straight section 222, converging channel 201.

[0028] Separation component 3, rotating shaft 31, air injection port 311, partition plate 32, first air blowing channel 321, first nozzle 3211, second nozzle 3212, first flow divider block 322, second air blowing channel 323, third nozzle 3231, fourth nozzle 3232, second flow divider block 324, air path switching switch 33, dense phase branch channel 301.

[0029] Concentration component 4, concentration channel 401, gas chamber 402, vent 403,

[0030] Limit plate 5. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] The concentration-depreciation separation apparatus of the present invention is described below with reference to the accompanying drawings.

[0033] like Figures 3 to 7 As shown, the concentration separation device of this invention includes: a bent tube body 1, a flow guiding component 2, a separation component 3, and a concentration component 4.

[0034] The flow guiding assembly 2 includes a first flow guiding plate 21 and a second flow guiding plate 22. Both the first flow guiding plate 21 and the second flow guiding plate 22 are disposed on the inner wall of the bend body 1 located on the outer side. The first flow guiding plate 21 includes a first tapered section 211 and a first straight section 212 connected together. The second flow guiding plate 22 includes a second tapered section 221 and a second straight section 222 connected together. The first tapered section 211 and the second tapered section 221 together define a converging channel 201. The cross-sectional area of ​​the converging channel 201 gradually decreases from upstream to downstream.

[0035] In this design, the side of the bend body 1 closest to its center is called the inner side, and the side of the bend body 1 furthest from its center is called the outer side. Upstream and downstream are defined according to the direction of the airflow. The gas-solid two-phase flow enters the bend body 1 from its upstream end. The powder, under the influence of inertia, accumulates on the outer side of the bend body 1, then enters the collecting channel 201, where it is collected under the guiding action of the first tapering section 211 and the second tapering section 221.

[0036] Optionally, the first tapering section 211 and the second tapering section 221 gradually approach each other along the airflow direction, thereby causing the cross-sectional area of ​​the converging channel 201 to gradually decrease from upstream to downstream, thus playing a role in guiding and converging the flow. The first straight section 212 and the second straight section 222 are arranged parallel to each other.

[0037] The separation component 3 includes a rotating shaft 31 and a partition plate 32. The partition plate 32 is rotatably disposed between the first straight section 212 and the second straight section 222 via the rotating shaft 31. The partition plate 32, the first straight section 212, the second straight section 222 and the inner wall of the bend body 1 together define a dense phase branch channel 301, which is connected to the converging channel 201.

[0038] Optionally, the rotating shaft 31 is arranged perpendicular to the first straight section 212 and the second straight section 222. One end of the rotating shaft 31 is rotatably connected to the first straight section 212, and the other end of the rotating shaft 31 is rotatably connected to the second straight section 222. The downstream end of the partition plate 32 (e.g.) Figure 7 The rear end of the partition plate 32 is connected to the rotating shaft 31, thereby allowing the partition plate 32 to rotate around the rotating shaft 31. The two end faces of the partition plate 32 in the width direction are respectively attached to the end faces of the first straight section 212 and the second straight section 222, so that the partition plate 32 divides the channel defined by the first straight section 212 and the second straight section 222 into a dense phase branch channel 301 and a dilute phase branch channel. That is, the channel outside the partition plate 32 is the dense phase branch channel 301, and the channel inside the partition plate 32 is the dilute phase branch channel.

[0039] It is understandable that when the partition 32 rotates outward (e.g.) Figure 5 When the partition plate 32 rotates upward, the cross-sectional area of ​​the upstream inlet of the dense phase branch channel 301 decreases. Since the powder concentration on the inner and outer sides of the bend body 1 is higher than that on the inner side, the flow rate entering the dense phase branch channel 301 decreases, and the solid-gas ratio of the dense phase branch increases. Similarly, when the partition plate 32 rotates inward, the cross-sectional area of ​​the upstream inlet of the dense phase branch channel 301 increases, the flow rate entering the dense phase branch channel 301 increases, and the solid-gas ratio of the dense phase branch decreases.

[0040] Furthermore, the concentration component 4 is connected to the bent tube body 1. The concentration component 4 has a concentration channel 401, a gas chamber 402 and a vent 403. The concentration channel 401 is connected to the concentrated phase branch channel 301. Multiple filter holes are provided on the peripheral wall of the concentration channel 401. The concentration channel 401 is connected to the gas chamber 402 through the filter holes. The vent 403 is connected to the gas chamber 402.

[0041] Optionally, such as Figure 5 As shown, the concentration channel 401 is located downstream of the dense phase branch channel 301. The upper sidewall of the concentration channel 401 is provided with multiple filter holes (or the upper sidewall of the concentration channel 401 is made of wear-resistant porous filter media such as metal or ceramic). After the dense phase branch enters the concentration channel 401, the airflow can pass through the filter holes into the air chamber 402, and the powder will be trapped on the wall surface of the concentration channel 401 by the filter holes. The vent 403 can be connected to an external variable frequency fan and an anemometer to achieve the function of evacuating and replenishing air in the concentration channel 401.

[0042] Understandably, when the solid-to-gas ratio of the dense phase flow entering the concentration channel 401 is lower than the required value for operating conditions, air is drawn out through the vent 403 by a fan until the two-phase flow concentration at the outlet of the concentration channel 401 reaches the required value for operating conditions. At this time, the pressure in the gas chamber 402 is low, and powder will gradually accumulate on the inner wall of the concentration channel 401. In order to remove the accumulated powder and ensure smooth filtration, the inner wall of the concentration channel 401 can be cleaned periodically by means of periodic vibration, ultrasonic waves, compressed air jets, etc.

[0043] Similarly, when the solid-to-gas ratio of the dense phase flow entering the enrichment channel 401 is lower than the required value under operating conditions, the direction of the fan connected to the vent 403 is reversed to replenish the airflow into the enrichment channel 401 until the two-phase flow concentration at the outlet of the enrichment channel 401 reaches the required value under operating conditions. At this time, powder will not accumulate on the inner wall of the enrichment channel 401, so regular cleaning is not required.

[0044] Specifically, such as Figure 2 As shown, the concentrated phase region C2 and the dilute phase region D2 are located at the outlet of the concentrated-dilute separation device in this embodiment of the invention. In contrast to related technologies, such as... Figure 1 As shown, the dense phase region C1 and the dilute phase region D1 are located at the separator outlet. The area of ​​C2 is smaller than that of C1, thus, the powder enrichment area at the separator outlet of this embodiment is more concentrated.

[0045] Therefore, the guiding and converging effect of the flow guiding component 2 makes the powder enrichment area at the separator outlet of this embodiment of the invention more concentrated. By rotating the partition plate 32 to adjust the flow rate and solid-gas ratio of the dense phase branch, the problem of fixed concentrations of the dense phase branch and the dilute phase branch after separation in related technologies is solved. Furthermore, the concentration of the dense phase branch is finely adjusted by the enrichment component 4, further enhancing the enrichment effect of the separator in this embodiment of the invention.

[0046] In some embodiments, such as Figure 3 and Figure 4 As shown, the first guide plate 21 and the second guide plate 22 are symmetrically arranged on both sides of the central axis of the bent pipe body 1 in the first direction.

[0047] The first direction refers to, for example, Figure 4 The first guide plate 21 and the second guide plate 22 are symmetrically arranged, with the upstream end of the first guide plate 21 and the upstream end of the second guide plate 22 being flush, and the downstream end of the first guide plate 21 and the downstream end of the second guide plate 22 being flush.

[0048] In some embodiments, such as Figures 3 to 6 As shown, the bend body 1 includes a bend section 11 and a straight section 12 connected together. The first tapering section 211 and the second tapering section 221 are both located in the bend section 11, and the first straight section 212 and the second straight section 222 are both located in the straight section 12.

[0049] Specifically, the downstream end of the first tapered section 211 is flush with the downstream end of the bend section 11, the upstream end of the first straight section 212 is flush with the upstream end of the straight section 12, and the downstream end of the first straight section 212 is flush with the downstream end of the straight section 12. Furthermore, the downstream end of the second tapered section 221 is flush with the downstream end of the bend section 11, the upstream end of the second straight section 222 is flush with the upstream end of the straight section 12, and the downstream end of the second straight section 222 is flush with the downstream end of the straight section 12.

[0050] In some embodiments, such as Figure 5 As shown, the line connecting the upstream end of the bend 11 to the center of the bend 11 is L1, and the line connecting the upstream end of the first tapering section 211 to the center of the bend 11 is L2. The included angle between L1 and L2 is a, and 20° < a < 55°.

[0051] Specifically, 'a' is 30°. It can be understood that during the operation of the separator in this embodiment of the invention, the gas-solid two-phase flow enters the separator from the lower inlet. As it passes through the bend section 11, the powder accumulates on the outside of the bend section 11 due to inertia. When entering the bend section 11 at approximately 30°, the dense phase powder on the outside of the bend section 11 enters the collecting channel 201. Under the guiding action of the first tapering section 211 and the second tapering section 221, the dense phase powder on the outside of the bend section 11 gradually gathers towards the center, forming... Figure 2 The export concentration zone.

[0052] In some embodiments, such as Figures 3 to 9 As shown, the partition plate 32 has a section along the length direction of the partition plate 32 (e.g. Figure 7 The first air blowing channel 321 extends in the front-back direction. The first air blowing channel 321 has a first air inlet and a first air outlet, the first air outlet being located on the end face of the partition plate 32 near the collecting channel 201 (e.g., in the front-back direction). Figure 7 On the front end face of the partition plate 32 in the middle. A first flow divider 322 is provided at the first air outlet, which divides the first air outlet into a first nozzle 3211 and a second nozzle 3212. The extension direction of the first nozzle 3211 is parallel to the extension direction of the first air blowing channel 321, and the extension direction of the second nozzle 3212 is at an angle to the extension direction of the first air blowing channel 321. The cross-sectional area of ​​the first nozzle 3211 is smaller than the cross-sectional area of ​​the second nozzle 3212.

[0053] The partition plate 32 also includes a second air blowing channel 323 extending along its length. The second air blowing channel 323 has a second air inlet and a second air outlet. The second air outlet is located on the end face of the partition plate 32 near the converging channel 201. A second diverting block 324 is provided at the second air outlet. The second diverting block 324 and the first diverting block 322 extend along the thickness direction of the partition plate 32 (e.g., ...). Figure 7 The air outlets are distributed relatively in the vertical direction. The second splitter block 324 divides the second air outlet into a third nozzle 3231 and a fourth nozzle 3232. The extension direction of the third nozzle 3231 is parallel to the extension direction of the second air blowing channel 323, and the extension direction of the fourth nozzle 3232 is at an angle to the extension direction of the second air blowing channel 323. The cross-sectional area of ​​the third nozzle 3231 is smaller than that of the fourth nozzle 3232.

[0054] Optionally, such as Figure 7As shown, the first air blowing channel 321 is located above the second air blowing channel 323. The cross-sectional shape of the first splitter block 322 and the second splitter block 324 is triangular. The lower side of the first splitter block 322 is the first nozzle 3211, the upper side of the first splitter block 322 is the second nozzle 3212, the upper side of the second splitter block 324 is the third nozzle 3231, and the lower side of the second splitter block 324 is the second nozzle 3212.

[0055] It is understandable that, such as Figure 5 As shown, when the separator plate 32 rotates upward or downward at a large angle, the powder will accumulate on the windward side of the separator plate 32 due to inertia, which is not conducive to the stable operation of the separator.

[0056] For example, such as Figure 8 and Figure 9 As shown, when the partition plate 32 rotates downwards, the first air blowing channel 321 is ventilated, while the second air blowing channel 323 is not ventilated. At this time, the jetting airflow passes through the first air blowing channel 321 and is divided into two streams by the action of the first diverting block 322. One larger stream of air is ejected obliquely upwards and mixes with the airflow from the collecting channel 201 to form a larger recirculation zone M, while the other smaller stream of air is ejected in a direction parallel to the first air blowing channel 321, forming a smaller recirculation zone N.

[0057] Therefore, the powder that would have deposited on the separator plate 32 due to inertia will directly enter the center of the dense phase branch channel 301 under the entrainment effect of the reflux zone M, thus avoiding deposition. Meanwhile, the powder that would have directly impacted the tip of the separator plate 32 will enter the dilute phase branch channel below under the action of the reflux zone N, thus avoiding the wear of the separator plate 32 and the problem of nozzle ash blockage.

[0058] Similarly, when the partition plate 32 rotates upward, the second air blowing channel 323 is ventilated, while the first air blowing channel 321 is not ventilated. At this time, the jetting airflow passes through the second air blowing channel 323 and is divided into two streams under the action of the second diverter block 324. One of the larger streams is ejected obliquely downward, mixing with the airflow from the collecting channel 201, forming a larger recirculation zone in the dilute phase branch channel, while the other smaller stream is ejected in a direction parallel to the second air blowing channel 323, forming a smaller recirculation zone.

[0059] In some embodiments, such as Figures 7 to 9 As shown, the rotating shaft 31 is provided with an air injection hole 311, and the first air inlet and the second air inlet are respectively connected to the air injection hole 311. The separation assembly 3 also includes an air path switching switch 33, which is rotatably disposed in the air injection hole 311. The air path switching switch 33 is used to control the connection and disconnection between the first air inlet or the second air inlet and the air injection hole 311.

[0060] It is understandable that, such as Figure 7 As shown, the air injection port 311 is connected to an external air source and serves as the main channel for the blowing airflow. When the air path switching switch 33 is rotated upwards, the first air inlet is blocked, and the blowing airflow enters the second blowing channel. When the air path switching switch 33 is rotated downwards, the second air inlet is blocked, and the blowing airflow enters the first blowing channel.

[0061] In some embodiments, such as Figures 3 to 9 As shown, it also includes a limiting plate 5, which is located between the first straight section 212 and the second straight section 222. The limiting plate 5 is located outside the dense phase branch channel 301 and is used to limit the rotation angle of the partition plate 32. For example, as Figure 9 As shown, under the action of the limiting plate 5, the partition plate 32 rotates downward to the maximum angle.

[0062] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0066] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A concentration-degradation separation device, characterized in that, include: The body of the bend; A flow guiding assembly includes a first flow guiding plate and a second flow guiding plate. Both the first flow guiding plate and the second flow guiding plate are disposed on the inner wall of the outer side of the bent pipe body. The first flow guiding plate includes a first tapered section and a first straight section connected in sequence along the airflow direction. The second flow guiding plate includes a second tapered section and a second straight section connected in sequence along the airflow direction. The first straight section and the second straight section are arranged parallel to each other. The first tapered section and the second tapered section are spaced apart to jointly define a converging channel. The distance between the first tapered section and the second tapered section gradually decreases along the airflow direction. A separation assembly includes a rotating shaft and a partition plate. The partition plate is rotatably disposed between the first straight section and the second straight section via the rotating shaft. The partition plate, the first straight section, the second straight section, and the inner wall of the bend body together define a dense phase branch channel, which is connected to the converging channel. A concentration assembly is connected to the bent tube body. The concentration assembly has a concentration channel, a gas chamber, and a vent. The concentration channel is connected to the concentrated phase branch channel. The peripheral wall of the concentration channel is provided with multiple filter holes. The concentration channel is connected to the gas chamber through the filter holes, and the vent is connected to the gas chamber.

2. The concentration-depreciation separation device according to claim 1, characterized in that, The first guide plate and the second guide plate are symmetrically arranged on both sides of the central axis of the bend body in a first direction.

3. The concentration-depreciation separation device according to claim 2, characterized in that, The bend body includes a bend section and a straight section connected together. The first tapered section and the second tapered section are both located within the bend section, and the first straight section and the second straight section are both located within the straight section.

4. The concentration-depreciation separation device according to claim 3, characterized in that, The line connecting the upstream end of the bend to the center of the bend is L1, and the line connecting the upstream end of the first tapered section to the center of the bend is L2. The included angle between L1 and L2 is α, and 20° < α < 55°.

5. The concentration-depreciation separation device according to claim 3, characterized in that, The downstream end of the first tapered section is flush with the downstream end of the bend, the upstream end of the first straight section is flush with the upstream end of the straight section, and the downstream end of the first straight section is flush with the downstream end of the straight section.

6. The concentration-depreciation separation device according to claim 1, characterized in that, The partition plate has a first air blowing channel extending along its length. The first air blowing channel has a first air inlet and a first air outlet. The first air outlet is located on the end face of the partition plate near the converging channel. A first diverting block is provided at the first air outlet, which divides the first air outlet into a first nozzle and a second nozzle. The extension direction of the first nozzle is parallel to the extension direction of the first air blowing channel, and the extension direction of the second nozzle forms an angle with the extension direction of the first air blowing channel. The cross-sectional area of ​​the first nozzle is smaller than that of the second nozzle.

7. The concentration-depreciation separation device according to claim 6, characterized in that, The partition plate also includes a second air-blowing channel extending along its length. The second air-blowing channel has a second air inlet and a second air outlet. The second air outlet is located on the end face of the partition plate near the converging channel. A second diverting block is provided at the second air outlet. The second diverting block and the first diverting block are distributed opposite to each other along the thickness direction of the partition plate. The second diverting block divides the second air outlet into a third nozzle and a fourth nozzle. The extension direction of the third nozzle is parallel to the extension direction of the second air-blowing channel. The extension direction of the fourth nozzle forms an angle with the extension direction of the second air-blowing channel. The cross-sectional area of ​​the third nozzle is smaller than that of the fourth nozzle.

8. The concentration-depreciation separation device according to claim 7, characterized in that, The partition plate has a first mode and a second mode. In the first mode, the first air blowing channel is open and the second air blowing channel is blocked. In the second mode, the first air blowing channel is blocked and the second air blowing channel is open.

9. The concentration-depreciation separation device according to claim 8, characterized in that, The rotating shaft is provided with an air injection hole. The first air inlet and the second air inlet are respectively connected to the air injection hole. The separation component also includes an air path switching switch. The air path switching switch is rotatably disposed in the air injection hole. The air path switching switch is used to control the connection and disconnection between the first air inlet or the second air inlet and the air injection hole.

10. The concentration-depreciation separation device according to claim 1, characterized in that, It also includes a limiting plate, which is disposed between the first straight section and the second straight section. The limiting plate is located outside the dense phase branch channel and is used to limit the rotation angle of the separator.

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