Aerosol collection device

Abstract

To improve collection efficiency for aerosol particulates on an aerosol collection device.SOLUTION: An aerosol collection device for collecting aerosol includes: a circulation part for circulating a gas containing aerosol; a throttle part installed to the circulation part; and a first droplet jetting part disposed upstream of a gas flow direction from the throttle part in the circulation part and jetting a droplet toward the gas flow direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an aerosol collection device. [Background technology]

[0002] Harmful substances generated during the decommissioning of nuclear power-related facilities, reprocessing plants, medical waste facilities, and dismantling of hazardous waste indoors, such as industrial waste, can become fine aerosol particles. The aerosol particles are dispersed indoors. Aerosol particles are also generated in plants that transport gaseous fluids, such as chemical plants and power plants. An aerosol collector that collects aerosol particles is described in Patent Document 1, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-187928 Summary of the Invention [Problem to be solved by the invention]

[0004] The aerosol collection device of Patent Document 1 includes a circulation section that circulates gas containing an aerosol, and a droplet injection section that injects droplets toward a separation region where the gas flow in the circulation section separates. Therefore, aerosol particles can be efficiently collected by spraying gas containing water droplets, but further improvement in performance is required.

[0005] The present disclosure is devised to solve the above-mentioned problems, and aims to provide an aerosol collection device that improves the efficiency of collecting aerosol particles. [Means for solving the problem]

[0006] In order to achieve the above-mentioned objective, the aerosol collection device of the present disclosure is an aerosol collection device that collects aerosols, and includes a circulation section that circulates a gas containing an aerosol, a throttling section provided in the circulation section, and a first droplet ejection section that is positioned upstream of the throttling section in the circulation section in the gas flow direction and ejects droplets toward the gas flow direction. Effect of the Invention

[0007] According to the aerosol collection device of the present disclosure, it is possible to improve the efficiency of collection of aerosol particles. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of an aerosol collecting device according to the first embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing the configuration of an aerosol collecting device according to the second embodiment. [Diagram 3] FIG. 3 is a schematic diagram showing the configuration of an aerosol collecting device according to the third embodiment. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along line IV-IV of FIG. [Diagram 5] FIG. 5 is a schematic diagram showing the configuration of an aerosol collecting device according to the fourth embodiment. [Figure 6] FIG. 6 is a schematic cross-sectional view taken along line VI-VI of FIG. [Figure 7] FIG. 7 is a schematic diagram showing the configuration of an aerosol collecting device according to the fifth embodiment. [Figure 8] FIG. 8 is a schematic cross-sectional view taken along line VIII-VIII of FIG. [Figure 9] FIG. 9 is a schematic diagram showing the configuration of an aerosol collecting device according to the sixth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to these embodiments, and when there are multiple embodiments, the present disclosure also includes a configuration in which each embodiment is combined. In addition, the components in the embodiments include those that a person skilled in the art can easily imagine, those that are substantially the same, and those that are within the so-called equivalent range.

[0010] [First embodiment] <Configuration of aerosol collection device> FIG. 1 is a schematic diagram showing the configuration of an aerosol collecting device according to the first embodiment.

[0011] As shown in Fig. 1, the aerosol collecting device 10 is disposed, for example, in the interior space of a building in which an aerosol generating source is located. The aerosol generating source is, for example, a processing device, and when processing an object, aerosols containing harmful substances are discharged into the building. When the object is an object contaminated with a radioactive substance, the harmful substance is the radioactive substance.

[0012] The aerosol collecting device 10 sprays droplets toward the flow section, i.e., performs water jet spray. The aerosol collecting device 10 sucks in gas by the water jet spray. The aerosol collecting device 10 then collects the aerosol particles by spraying the water jet toward the gas containing the sucked aerosol particles.

[0013] The aerosol collecting device 10 includes a flow section 11, a throttle section 12, and a first droplet ejecting section 13.

[0014] The flow section 11 is constituted by the housing 21. The housing 21 is a pipe member having a cylindrical shape centered on the axis O. However, the housing 21 is not limited to a pipe member having a cylindrical shape, and may be a pipe member having an elliptical cylinder shape or a polygonal cylinder shape. The housing 21 is arranged along the vertical direction and is installed on a predetermined floor surface by a plurality of legs 22. However, the housing 21 may be arranged along a direction inclined with respect to the vertical direction, or may be arranged along the horizontal direction. The housing 21 is provided with an inlet section 23 at an upper part in the vertical direction, and an outlet section 24 at a lower part in the vertical direction. The flow section 11 is provided inside the housing 21, and is a space section from the inlet section 23 to the outlet section 24. The flow section 11 has the same flow path cross-sectional area of ​​the gas A from the inlet section 23 to the outlet section 24. The flow section 11 allows the gas A containing the aerosol to flow.

[0015] The throttle section 12 is provided in the flow section 11. The throttle section 12 is constituted by a partition member 31. The partition member 31 has an opening 32 in the center of the flow section 11. The partition member 31 is provided so as to protrude from the inner wall surface 21a of the housing 21 constituting the flow section 11 toward the center, and has a curved cross-sectional shape (for example, a semicircular cross-sectional shape) that allows smooth gas flow.

[0016] The first droplet ejection section 13 generates and ejects droplets W1 for collecting aerosol. The first droplet ejection section 13 generates droplets W1 having a diameter of, for example, 10 μm or more and 500 μm or less. The first droplet ejection section 13 is disposed upstream of the throttling section 12 in the flow direction of the gas A in the flow section 11. The first droplet ejection section 13 is disposed in the center of the flow section 11. The first droplet ejection section 13 ejects the droplets W1 toward the flow direction of the gas A in the flow section 11. That is, the first droplet ejection section 13 ejects the droplets W1 downward in the vertical direction (direction along the axis O). The first droplet ejection section 13 ejects the droplets W1 downward toward the opening 32 of the partition member 31 constituting the throttling section 12.

[0017] Specifically, the first droplet ejection section 13 is disposed upstream in the flow direction of the gas A from the position of the minimum flow path area in the throttling section 12. That is, in the flow direction of the gas A in the circulation section 11, the position of the minimum flow path area in the throttling section 12 is defined as P1, and the ejection position P2 of the droplet W1 in the first droplet ejection section 13 is defined as P2. In this case, the ejection position P2 of the droplet W1 in the first droplet ejection section 13 is located upstream in the flow direction of the gas A by a distance L from the position P1 of the minimum flow path area in the throttling section 12. The first droplet ejection section 13 ejects the droplet W1 to form a conical shape, but it is preferable to eject the droplet W1 at an ejection angle such that the droplets are uniformly distributed toward the center of the inner surface of the opening without contacting the inner surface of the opening.

[0018] The first droplet ejection unit 13 ejects the droplets W1 at a speed of, for example, 20 m / sec or more, up to 300 m / sec. The first droplet ejection unit 13 ejects the droplets W1 at a predetermined flow speed or more, and thereby forms a flow of gas A (induced flow) that draws the external gas A into the inlet 23 of the housing 21 due to an ejector effect.

[0019] In the first embodiment, a plurality of sets (three sets in this embodiment) of the throttling section 12 and the first droplet ejecting section 13 are provided at intervals in the flow direction of the gas A in the circulating section 11. In this case, the plurality of throttling sections 12 are arranged at intervals in the flow direction of the gas A in the circulating section 11, and the plurality of first droplet ejecting sections 13 are arranged at positions corresponding to the respective throttling sections 12.

[0020] <Aerosol collection method> The first droplet ejection section 13 ejects droplets W1 downward toward the opening 32 of the partition member 31. Then, an induced flow is formed, and the gas A containing the aerosol outside the housing 21 is sucked into the flow section 11 from the inflow section 23. When the gas A containing the aerosol sucked into the flow section 11 passes through the opening 32 of the partition member 31 that constitutes the throttle section 12, the aerosol converges near the central axis.

[0021] Moreover, the first droplet ejecting section 13 ejects the droplets W1 at high speed toward the center rather than the opening 32 of the partition member 31. This increases the frequency of collision between the aerosol and the droplets W1, allowing the aerosol particles to be efficiently collected by the droplets W1. Furthermore, by arranging a plurality of pairs of the throttle section 12 and the first droplet ejecting section 13, the aerosol particles can be effectively collected by the droplets W1.

[0022] [Second embodiment] 2 is a schematic diagram showing the configuration of an aerosol collecting device according to a second embodiment of the present invention. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals and detailed descriptions thereof will be omitted.

[0023] 2, the aerosol collection device 10A includes a flow section 11, a throttle section 12, and a first droplet jetting section 13. The flow section 11, the throttle section 12, and the first droplet jetting section 13 are substantially similar to those in the first embodiment.

[0024] In addition, in the flow section 11, an extension path 41 extending to the source G that generates the aerosol is connected to the inlet section 23. The extension path 41 is a pipe, one end of which is connected to the inlet section 23 of the housing 21, and the other end of which is disposed above the aerosol generated at the source G.

[0025] Therefore, the aerosol collecting device 10A can effectively suck in and process the aerosol generated at the generation source G through the extension path 41.

[0026] [Third embodiment] Fig. 3 is a schematic diagram showing the aerosol collection device of the third embodiment, and Fig. 4 is a schematic cross-sectional view taken along line IV-IV in Fig. 3. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals and detailed description thereof will be omitted.

[0027] 3 and 4, the aerosol collection device 10B includes a flow section 11, a throttle section 51, a first liquid droplet jetting section 13, and a second liquid droplet jetting section 52. The flow section 11 and the first liquid droplet jetting section 13 are similar to those in the first embodiment.

[0028] The throttle section 51 is provided in the flow section 11. The throttle section 51 is configured by a partition member 53. The partition member 53 has an opening 54 in the center of the flow section 11. In other words, the partition member 53 has a holed disk shape. The partition member 53 is provided so as to protrude from the inner wall surface 21a of the housing 21 that constitutes the flow section 11 toward the center.

[0029] The first droplet ejection section 13 is disposed upstream of the throttling section 51 in the flow direction of the gas A in the flow section 11. The first droplet ejection section 13 is disposed in the center of the flow section 11. The first droplet ejection section 13 ejects droplets W1 toward the flow direction of the gas A in the flow section 11. That is, the first droplet ejection section 13 ejects droplets W1 downward toward the opening 54 of the partition member 53 constituting the throttling section 51. The first droplet ejection section 13 ejects droplets W1 at a predetermined flow rate or faster, thereby forming a flow of the gas A (induced flow) that draws the external gas A into the inlet section 23 of the housing 21 due to the ejector effect.

[0030] The second droplet ejection section 52 generates and ejects droplets W2 for collecting aerosol. The second droplet ejection section 52 is disposed downstream of the narrowing section 51 in the flow direction of the gas A in the flow section 11. A plurality of first droplet ejection sections 13 (four in this embodiment) are disposed radially outward from the first droplet ejection section 13. The second droplet ejection section 52 ejects the droplets W2 in the opposite direction to the flow direction of the gas A in the flow section 11. That is, the second droplet ejection section 52 ejects the droplets W2 vertically upward. The second droplet ejection section 52 ejects the droplets W2 around the droplets W1 ejected by the first droplet ejection section 13.

[0031] The throttle section 51 and the first droplet ejection section 13 are provided in a plurality of pairs (three pairs in this embodiment) at intervals in the flow direction of the gas A in the flow section 11. On the other hand, the second droplet ejection section 52 is not provided in the first stage throttle section 51, but is provided only in the second and third stages throttle sections 51. That is, four second droplet ejection sections 52 are arranged on the upper surface portion in the vertical direction of the partition member 53 in the second stage (middle stage in FIG. 3). The four second droplet ejection sections 52 are arranged at intervals (preferably at equal intervals) in the circumferential direction. The number of the second droplet ejection sections 52 is not limited. The second droplet ejection section 52 ejects droplets W2 upward. In addition, four second droplet ejection sections 52 are arranged on the upper surface portion in the vertical direction of the partition member 53 in the third stage (lower stage in FIG. 3). The four second droplet ejectors 52 are arranged at intervals (preferably at equal intervals) in the circumferential direction. The second droplet ejectors 52 eject droplets W2 upward. The first stage (upper stage in FIG. 3) of the partition member 53 does not have the second droplet ejectors 52 arranged on the upper surface in the vertical direction.

[0032] In the third embodiment, the first droplet ejection section 13 ejects droplets W1 downward from the center of the flow section 11 toward the opening 54 of the partition member 53. Meanwhile, the second droplet ejection section 52 ejects droplets W2 upward from an outer periphery shifted outward from the center of the flow section 11 toward the partition member 53. That is, the droplets W1 from the first droplet ejection section 13 and the droplets W2 from the second droplet ejection section 52 are ejected facing each other. Then, the droplets W1 from the first droplet ejection section 13 are ejected toward the center of the flow section 11, and the droplets W2 from the second droplet ejection section 52 are ejected toward the outer periphery of the flow section 11, that is, around the droplets W1.

[0033] It is preferable that the flow rate per unit time of the droplets W2 ejected from the second droplet ejection section 52 (the total amount of ejection from the multiple second droplet ejection sections 52) is less than the flow rate per unit time of the droplets W1 ejected from the first droplet ejection section 13. It is also preferable that the flow velocity of the droplets W2 ejected from the second droplet ejection section 52 is slower than the flow velocity of the droplets W1 ejected from the first droplet ejection section 13.

[0034] Therefore, the first droplet ejection section 13 ejects droplets W1 downward toward the opening 54 of the partition member 53. Then, an induced flow is formed, and the aerosol-containing gas A outside the housing 21 is sucked into the circulation section 11 from the inflow section 23. The flow rate of the aerosol-containing gas A sucked into the circulation section 11 increases when it passes through the opening 54 of the partition member 53 that constitutes the throttle section 51. Then, the induced flow rate of the aerosol-containing gas A into the circulation section 11 can be increased.

[0035] Moreover, the first droplet jetting unit 13 sprays the spray droplets at the opening 54 of the partition member 53 where the aerosol converges to the central axis. Therefore, the frequency of collision between the aerosol and the droplets W1 increases, and the aerosol particles can be efficiently collected by the droplets W1. Furthermore, by arranging a plurality of pairs of the throttle unit 51 and the first droplet jetting unit 13, the aerosol particles can be effectively collected by the droplets W1.

[0036] Furthermore, the second droplet jetting units 52 jet droplets W2 upward toward the partition member 53. The droplets W2 jetted from the second droplet jetting units 52 face the droplets W1, which promotes collisions between the aerosol particles and the droplets W1 and W2, and allows the aerosol particles to be efficiently collected by the droplets W1 and W2. The droplets W2 jetted from the second droplet jetting units 52 are jetted around the droplets W1, which prevents the gas A containing the aerosol from passing through the outside of the droplets W1 jetted from the first droplet jetting unit 13, and allows the efficiency of collecting the aerosol particles by the droplets W1 and W2 to be improved.

[0037] [Fourth embodiment] Fig. 5 is a schematic diagram showing the aerosol collection device of the fourth embodiment, and Fig. 6 is a schematic cross-sectional view taken along line VI-VI in Fig. 5. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals and detailed description thereof will be omitted.

[0038] 5 and 6, the aerosol collection device 10C includes a circulation section 11, a throttle section 61, a first droplet jetting section 13, a droplet storage section 62, a third droplet jetting section 63, and a fourth droplet jetting section 64. The circulation section 11 and the first droplet jetting section 13 are similar to those in the first embodiment.

[0039] The throttle section 61 is provided in the flow section 11. The throttle section 61 is composed of a partition member 71. The partition member 71 has an opening 72 at a position shifted from the center of the flow section 11 to one side in the radial direction. A plurality of partition members 71 (three in this embodiment) are provided in the flow section 11 at intervals in the flow direction of the gas A. The openings 72 are provided alternately in the radial direction for the three stages of partition members 71. That is, the first stage partition member 71 has the opening 72 provided on one side in the radial direction (left side in FIG. 5), the second stage partition member 71 has the opening 72 provided on the other side in the radial direction (right side in FIG. 5), and the third stage partition member 71 has the opening 72 provided on one side in the radial direction (left side in FIG. 5). Note that the openings 72 are in contact with the inner wall surface 21a of the housing 21, but may be located on the center side of the flow section 11 from the inner wall surface 21a of the housing 21.

[0040] The first droplet ejection section 13 is disposed upstream of the throttle section 61 in the flow section 11 in the flow direction of the gas A. The first droplet ejection section 13 is disposed facing and above the opening 72. The first droplet ejection section 13 ejects droplets W1 downward toward the opening 72. The first droplet ejection section 13 ejects the droplets W1 at a predetermined flow rate or faster, thereby forming a flow of the gas A (induced flow) that draws the external gas A into the inflow section 23 of the housing 21 due to the ejector effect.

[0041] The droplet storage section 62 is disposed on the upstream side of the partition member 71 in the flow direction of the gas A. That is, the droplet storage section 62 is provided on the upper surface side of the partition member 71. The partition member 71 is provided with a weir 73 around the periphery of the opening 72, so that the droplet storage section 62 is formed on the upper surface of the partition member 71.

[0042] The third droplet ejection section 63 generates and ejects droplets W3 for collecting aerosol. The third droplet ejection section 63 is disposed upstream of the throttle section 61 in the flow section 11 in the flow direction of the gas A. That is, the third droplet ejection section 63 ejects droplets W3 from the inner wall surface 21a of the housing 21 toward the droplet storage section 62 and the opening 72 on the upstream side of the partition member 71 in the flow direction of the gas A. The third droplet ejection sections 63 are provided alternately in the radial direction with respect to the three stages of the partition members 71. That is, the first-stage third droplet ejection section 63 ejects droplets W3 from the other radial side (right side in Figure 5) toward one radial side (left side in Figure 5), the second-stage third droplet ejection section 63 ejects droplets W3 from one radial side (left side in Figure 5) toward the other radial side (right side in Figure 5), and the third-stage third droplet ejection section 63 ejects droplets W3 from the other radial side (right side in Figure 5) toward one radial side (left side in Figure 5).

[0043] The fourth droplet ejection section 64 generates and ejects droplets W4 for collecting aerosol. The fourth droplet ejection section 64 is disposed downstream of the narrowing section 61 in the flow section 11 in the flow direction of the gas A. That is, the fourth droplet ejection section 64 ejects droplets W4 from the inner wall surface 21a of the housing 21 toward the opening 72 on the downstream side of the flow direction of the gas A in the partition member 71. The fourth droplet ejection sections 64 are provided alternately in the radial direction for the three stages of the partition member 71. That is, the first stage fourth droplet ejection section 64 ejects droplets W4 from the other side in the radial direction (right side in FIG. 5) toward one side in the radial direction (left side in FIG. 5), and the second stage fourth droplet ejection section 64 ejects droplets W4 from one side in the radial direction (left side in FIG. 5) toward the other side in the radial direction (right side in FIG. 5). The fourth droplet ejection section 64 is disposed on both sides of the opening 72.

[0044] In the fourth embodiment, the third droplet ejection section 63 ejects droplets W3 from the inner wall surface 21a of the housing 21 toward the droplet storage section 62, causing the droplets stored in the droplet storage section 62 to overflow and scatter into the opening 72. The fourth droplet ejection section 64 ejects droplets W4 from the inner wall surface 21a of the housing 21 toward the opening 72, causing the droplets W4 to collide with the droplets that overflow from the droplet storage section 62 and scatter downward from the opening. Here, it is preferable that the flow rate per unit time of the droplets W3 ejected from the third droplet ejection section 63 is greater than the flow rate per unit time of the droplets W4 ejected from the fourth droplet ejection section 64. In addition, it is preferable that the flow rate of the droplets W3 ejected from the third droplet ejection section 63 is greater than the flow rate of the droplets W4 ejected from the fourth droplet ejection section 64. Furthermore, by preventing the aerosol from jetting outside the droplet jetting area between the third droplet jetting section 63 facing the fourth droplet jetting section 64 and by maintaining a large speed difference between the aerosol and the droplets, the aerosol can be efficiently collected into droplets.

[0045] Therefore, the first droplet ejection section 13 ejects droplets W1 downward toward the opening 72 of the partition member 71. Then, an induced flow is formed, and the aerosol-containing gas A outside the housing 21 is sucked into the circulation section 11 from the inflow section 23. The flow rate of the aerosol-containing gas A sucked into the circulation section 11 increases when it passes through the opening 72 of the partition member 71 that constitutes the throttle section 61. Then, the induced flow rate of the aerosol-containing gas A into the circulation section 11 can be increased.

[0046] Furthermore, the first droplet jetting section 13 jets the droplets W1 through the opening 72 of the partition member 71 into the gas A containing the aerosol converged directly below the first droplet spraying section 13. This increases the frequency of collision between the aerosol and the droplets W1, thereby enabling the aerosol particles to be efficiently collected by the droplets W1.

[0047] Furthermore, the third droplet ejection section 63 ejects droplets W3 toward the droplet storage section 62. Then, the droplets stored in the droplet storage section 62 are ruffled by the ejected droplets W3, and overflow into the opening 72 and scatter. Furthermore, the fourth droplet ejection section 64 ejects droplets W4 toward the opening 72 below the partition member 71. Then, the droplets W4 collide with the droplets scattered downward from the opening 72. The aerosol-containing gas A flowing downward through the opening 72 collides with the droplets W3, the droplets from the droplet storage section 62, and the droplets W4, and the aerosol particles can be efficiently collected.

[0048] [Fifth embodiment] Fig. 7 is a schematic diagram showing the aerosol collecting device of the fifth embodiment, and Fig. 8 is a schematic cross-sectional view taken along line VIII-VIII in Fig. 7. Note that members having the same functions as those in the above-mentioned fourth embodiment are given the same reference numerals and detailed description thereof will be omitted.

[0049] 7 and 8, the aerosol collecting device 10D includes a circulation section 11, a throttle section 61, a first droplet jetting section 13, a droplet storage section 62, a third droplet jetting section 63, a fourth droplet jetting section 64, and a fifth droplet jetting section 65. The circulation section 11, the throttle section 61, the first droplet jetting section 13, the droplet storage section 62, the third droplet jetting section 63, and the fourth droplet jetting section 64 are the same as those in the fourth embodiment.

[0050] The fifth droplet ejection section 65 generates and ejects droplets W5 for collecting aerosol. The fifth droplet ejection section 65 is disposed downstream of the narrowing section 61 in the flow section 11 in the flow direction of the gas A. That is, the fifth droplet ejection section 65 ejects droplets W5 from the lower surface of the partition member 71 toward the opening 72 of the partition member 71 on the lower side of the flow direction of the gas A in the partition member 71. The fifth droplet ejection sections 65 are provided alternately in the radial direction for the three stages of the partition members 71. That is, the fifth droplet ejection section 65 of the first stage ejects droplets W5 from the other side in the radial direction (the right side in FIG. 7) toward the opening 72 of the partition member 71 of the second stage, and the fifth droplet ejection section 65 of the second stage ejects droplets W5 from one side in the radial direction (the left side in FIG. 7) toward the opening 72 of the partition member 71 of the third stage.

[0051] Therefore, the fifth droplet jetting section 65 jets droplets W5 from the lower surface of the partition member 71 toward the opening 72 of the lower partition member 71. Then, the droplets W5 collide with the droplets W3 jetted from the third droplet jetting section 63, and the aerosol particles can be efficiently collected. In addition, since the droplets W5 are jetted toward the opening 72, the aerosol particles can be trapped in the droplet storage section 62.

[0052] [Sixth embodiment] 9 is a schematic diagram showing the configuration of an aerosol collecting device according to the sixth embodiment. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals and detailed explanations are omitted.

[0053] 9, the aerosol collection device 10E includes a circulation section 11, a throttle section 81, a first droplet jetting section 13, a droplet storage section 62, a third droplet jetting section 63, a fourth droplet jetting section 64, and a fifth droplet jetting section 65. The circulation section 11, the first droplet jetting section 13, the droplet storage section 62, the third droplet jetting section 63, the fourth droplet jetting section 64, and the fifth droplet jetting section 65 are the same as those in the fifth embodiment.

[0054] The throttle section 81 is provided in the flow section 11. The throttle section 81 is configured by a partition member 82. The arrangement of the partition member 82 is similar to that of the partition member 71 of the fifth embodiment (see FIG. 7). The partition member 82 is provided with a large number of through holes 83 penetrating in the direction of the flow of the gas A. That is, the partition member 82 is a porous plate having the large number of through holes 83.

[0055] Therefore, the partition member 82 has a droplet storage section 62 on its upper surface. Some of the droplets W1, W3, W4, W5, etc. are stored in the droplet storage section 62. Since the partition member 82 has a large number of through holes 83, some of the droplets stored in the droplet storage section 62 fall downward. The aerosol-containing gas A flowing through the circulation section 11 collides with the droplets falling from the large number of through holes 83 in the partition member 82 from the droplet storage section 62, and the aerosol particles can be efficiently collected.

[0056] [Effects of this embodiment] The aerosol collection device of the first aspect is an aerosol collection device 10, 10A, 10B, 10C, 10D, 10E that collects an aerosol, and includes a circulation section 11 through which gas A containing an aerosol is circulated, a throttling section 12, 51, 61, 81 provided in the circulation section 11, and a first droplet ejection section 13 that is positioned upstream of the throttling section 12, 51, 61, 81 in the circulation section 11 in the flow direction of the gas A and ejects droplets W1 toward the flow direction of the gas A.

[0057] According to the aerosol collecting device according to the first aspect, when the first droplet ejection unit 13 ejects the droplets W1 into the flow section 11, an induced flow is formed in the flow section 11, and the gas A containing aerosol is sucked into the flow section 11 from the outside. The flow rate of the gas A containing aerosol sucked into the flow section 11 increases when passing through the narrowing units 12, 51, 61, and 81. Therefore, the induced flow rate of the gas A containing aerosol into the flow section 11 can be increased. In addition, the first droplet ejection unit 13 ejects the droplets W1 into the gas A containing aerosol guided directly below the first droplet ejection unit 13. Therefore, the frequency of collision between the aerosol and the droplets W1 increases, and the aerosol particles can be efficiently collected by the droplets W1. As a result, the collection efficiency of the aerosol particles can be improved.

[0058] The aerosol collecting device according to the second aspect is the aerosol collecting device according to the first aspect, and further, the first droplet jetting section 13 is disposed upstream in the flow direction of the gas A from the position of the minimum flow path area in the throttling section 12, 51, 61, 81. This allows the first droplet jetting section 13 to accurately jet the droplets W1 into the aerosol-containing gas A guided directly below the first droplet jetting section 13 in the throttling section 12, 51, 61, 81.

[0059] The aerosol collecting device according to the third aspect is the aerosol collecting device according to the first or second aspect, and further includes a plurality of pairs of the throttle units 12, 51, 61, 81 and the first droplet ejecting unit 13 provided at intervals in the flow direction of the gas A. This makes it possible to effectively collect aerosol particles by the droplets W1.

[0060] The aerosol collection device according to the fourth aspect is the aerosol collection device according to any one of the first to third aspects, and further, the throttle section 12, 51, 61, 81 has a partition member 31, 53, 71, 82 having an opening 32, 54, 72 at the center of the flow section 11, and the first droplet jetting section 13 is disposed at the center of the flow section 11. As a result, the aerosol-containing gas A sucked into the flow section 11 is accelerated at the opening 32, 54, 72 at the center of the flow section 11, and the first droplet jetting section 13 jets droplets W1 into the aerosol-containing gas A guided directly below the first droplet jetting section 13, and the aerosol and the droplets W1 can be efficiently collided with each other over a wide area to be collected.

[0061] The aerosol collecting device according to the fifth aspect is the aerosol collecting device according to the fourth aspect, further comprising: partition member 31 having a curved cross-sectional shape protruding from inner wall surface 21a of flow section 11 toward the center, and first droplet ejecting section 13 ejects droplets at an ejection angle that does not contact the inner surface of partition member 31. This allows gas A containing aerosol to flow smoothly in flow section 11, thereby allowing droplets W1 to be appropriately ejected and collided with gas A containing aerosol.

[0062] The aerosol collection device according to a sixth aspect is the aerosol collection device according to any one of the first to fifth aspects, and further includes a second droplet jetting section 52 that is disposed downstream in the flow direction of the gas A from the throttling section 51 in the flow section 11 and radially outward from the first droplet jetting section 13 and jets droplets W2 in the opposite direction to the flow direction of the gas A. As a result, the droplets W2 jetted from the second droplet jetting section 52 face the droplets W1 jetted from the first droplet jetting section 13, thereby promoting collisions between the aerosol particles and the droplets W1 and W2, and the aerosol particles can be efficiently collected by the droplets W1 and W2. Furthermore, since the droplets W2 ejected from the second droplet ejection section 52 are ejected around the droplets W1, the gas A containing the aerosol is prevented from passing through the outside of the droplets W1 ejected from the first droplet ejection section 13, thereby improving the efficiency of collecting aerosol particles by the droplets W1 and W2.

[0063] The aerosol collection device of the seventh aspect is an aerosol collection device of any one of the first to sixth aspects, and further includes a partition member 71 that forms an opening 72 at a position shifted from the center of the flow section 11, and is provided with a droplet storage section 62 that is arranged on the upstream side of the partition member 71 in the flow direction of gas A, and a third droplet ejection section 63 that ejects droplets W3 from the inner wall surface 21a side of the flow section 11 toward the droplet storage section 62 and the opening 72 on the upstream side of the partition member 71 in the flow direction of gas A. As a result, when the third droplet ejection section 63 ejects the droplets W3 toward the droplet storage section 62, the droplets stored in the droplet storage section 62 are disturbed by the droplets W3 and overflow into the opening 72, causing them to scatter. The aerosol-containing gas A flowing downward through the opening 72 collides with the droplets W3 and the droplets scattered from the droplet storage section 62, allowing the aerosol particles to be efficiently collected.

[0064] The aerosol collecting device according to the eighth aspect is the aerosol collecting device according to the seventh aspect, and further includes a fourth droplet ejection section 64 that ejects droplets W4 from the inner wall surface 21a of the flow section 11 toward the opening 72 on the downstream side of the partition member 71 in the flow direction of the gas A. As a result, the fourth droplet ejection section 64 ejects droplets W4 toward the opening 72 below the partition member 71, whereby the droplets W4 collide with the gas A containing aerosol flowing downward from the opening 72, and the aerosol particles can be efficiently collected. In addition, the aerosol does not blow out of the droplet ejection region between the third droplet ejection section 63 facing the fourth droplet ejection section 64, and a large speed difference between the aerosol and the droplets is maintained, so that the aerosol can be efficiently collected as droplets.

[0065] The aerosol collection device according to the ninth aspect is the aerosol collection device according to the seventh or eighth aspect, further comprising a plurality of sets of partition member 71, droplet storage section 62, and third droplet jetting section 63 provided at intervals in the flow direction of gas A, and a fifth droplet jetting section 65 that jets droplets W5 from the downstream side of partition member 71 in the flow direction of gas A toward an opening 72 downstream in the flow direction of gas A is provided. As a result, when the fifth droplet jetting section 65 jets droplets W5 from the lower surface section of partition member 71 toward the opening 72 of the partition member 71 on the lower side, the droplets W5 collide with the droplets W3 jetted from the third droplet jetting section 63, and aerosol particles can be efficiently collected.

[0066] The aerosol collection device according to the tenth aspect is the aerosol collection device according to any one of the first to ninth aspects, and further, the partition member 82 is provided with a large number of through holes 83 penetrating into the flow of the gas A. As a result, some of the droplets stored in the droplet storage section 62 fall downward through the large number of through holes 83 and collide with the sprayed droplets, making it possible to efficiently collect the aerosol particles.

[0067] The aerosol collector according to an eleventh aspect is the aerosol collector according to any one of the first to tenth aspects, and further includes an extension path 41 that extends to an aerosol generating source G and is connected to the inflow portion 23 of the flow section 11. This allows the aerosol generated at the source G to be effectively sucked in and treated through the extension path 41. [Explanation of symbols]

[0068] 10, 10A, 10B, 10C, 10D, 10E Aerosol collection device 11 Distribution Department 12,51,61,81 Constriction section 13 First droplet injection part 21 Case 22 Legs 23 Inlet 24 Discharge section 31,53,71,82 Partition members 32,54,72 Opening 41 Extension route 52 Second droplet injection part 62 Droplet storage unit 63 Third droplet injection section 64 4th droplet injection section 65 5th droplet injection section 73 Weir 83 Through hole A Gas G Source W1,W2,W3,W4,W5 droplet

Claims

1. An aerosol collecting device for collecting aerosols, comprising: A flow section for flowing a gas containing an aerosol; A throttle portion provided in the flow section; a first droplet ejection section that is disposed upstream of the throttle section in the flow section in the gas flow direction and ejects droplets toward the gas flow direction; An aerosol collecting device comprising:

2. the first droplet ejecting portion is disposed upstream in a gas flow direction from a position of a minimum flow path area in the throttle portion; The aerosol collection device according to claim 1 .

3. The throttle portion and the first droplet ejection portion are provided in a plurality of pairs at intervals in the gas flow direction. The aerosol collection device according to claim 1 .

4. the throttle portion has a partition member having an opening at a center of the flow portion, and the first droplet ejection portion is disposed at the center of the flow portion. The aerosol collection device according to claim 1 .

5. the partition member has a curved cross-sectional shape protruding from an inner wall surface of the flow section toward a center portion, and the first droplet ejection section ejects droplets at an ejection angle that does not allow the droplets to come into contact with an inner surface of the partition member. The aerosol collecting device according to claim 4.

6. a second liquid droplet ejecting portion that is disposed downstream of the throttle portion in the flow section in the gas flow direction and radially outward of the first liquid droplet ejecting portion and ejects liquid droplets in a direction opposite to the gas flow direction; The aerosol collecting device according to claim 4.

7. the restricting section has a partition member that forms an opening at a position shifted from the center of the flow section, and is provided with a droplet storage section that is arranged on the upstream side of the partition member in the gas flow direction, and a third droplet ejection section that ejects droplets from an inner wall surface side of the flow section toward the droplet storage section and the opening, on the upstream side of the partition member in the gas flow direction. The aerosol collection device according to claim 1 .

8. a fourth droplet ejection section that ejects droplets from an inner wall surface side of the flow section toward the opening section, the fourth droplet ejection section being located downstream in the gas flow direction of the partition member; The aerosol collection device according to claim 7.

9. a fifth droplet ejection unit that ejects droplets from a downstream side of the partition member in the gas flow direction toward the opening on the downstream side in the gas flow direction; The aerosol collection device according to claim 7.

10. The partition member is provided with a large number of through holes penetrating the gas flow. The aerosol collecting device according to any one of claims 4 to 9.

11. The flow section has an extension path connected to the inlet section and extending to a source that generates an aerosol. The aerosol collection device according to claim 1 .

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