WO2017159099A1

WO2017159099A1 - Exhaust gas processing device

Info

Publication number: WO2017159099A1
Application number: PCT/JP2017/003677
Authority: WO
Inventors: 邦幸高橋; 譲榎本
Original assignee: 富士電機株式会社
Priority date: 2016-03-15
Filing date: 2017-02-01
Publication date: 2017-09-21
Also published as: JP2019076798A

Abstract

In order to prevent the discharge of atomized seawater that has absorbed sulfur oxide or the like to the outside from a reaction column, sometimes a plurality of ring-shaped fluid-return structures are provided inside the reaction column. However, providing a plurality of fluid-return structures increases the length in the height direction of the reaction column, and consequently, it is difficult to provide reaction columns inside a compartment in a ship, where space is limited. Thus, the provided exhaust gas processing device for processing exhaust gas is equipped with: a reaction column that has a cylindrical interior space extending in the height direction from the floor side thereof where exhaust gas is introduced to the upper side thereof where exhaust gas is discharged, and cleans the exhaust gas, which rises while circling, by spraying the gas with a fluid; a reducer that is connected to the reaction column and provided above the reaction column; a flue provided in a manner such that at least one section thereof is above the reducer; and an upper fluid-return structure provided in the reducer.

Description

Exhaust gas treatment equipment

The present invention relates to an exhaust gas treatment apparatus.

Conventionally, sulfur oxides (SOx) and the like in exhaust gas have been removed by gas-liquid contact between the exhaust gas introduced into the reaction tower and the liquid ejected from the nozzle provided in the reaction tower.
[Prior art documents]
[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 06-190240 [Patent Document 2] Japanese Patent Laid-Open No. 08-281055

Challenges to be solved

In order to prevent the mist-like seawater that has absorbed sulfur oxides from being discharged from the reaction tower to the outside, a plurality of liquid return structures that are ring-shaped may be provided inside the reaction tower. However, since the length in the height direction of the reaction tower is increased by providing a plurality of liquid return structures, it is difficult to provide the reaction tower in the interior of the ship, which is a limited space.

General disclosure

In the first aspect of the present invention, an exhaust gas treatment apparatus for treating exhaust gas is provided. The exhaust gas treatment apparatus may include a reaction tower, a reducer section, a flue section, and an upper liquid return structure. The reaction tower may have an internal space. The internal space may have a cylindrical shape extending in the height direction. The height direction may be a direction from the bottom side where the exhaust gas is introduced to the upper side where the exhaust gas is discharged. The reaction tower may wash the exhaust gas by injecting liquid into the exhaust gas rising while turning. The reducer section may be connected to the reaction tower. The reducer section may be provided above the reaction tower. At least a part of the flue portion may be provided above the reducer portion. The upper liquid return structure may be provided in the reducer part.

The upper liquid return structure may have at least one of a flue protrusion and an upper liquid return ring. The flue protrusion may be a portion provided by extending a part of the flue to the reducer. The upper liquid return ring may protrude from the inner wall of the reducer part. The upper liquid return ring may be provided in a ring shape on the inner wall of the reducer part.

The upper liquid return structure may have both a flue protrusion and an upper liquid return ring. The exhaust gas treatment device may further include a lower liquid return ring. The lower liquid return ring may protrude from the inner wall of the reaction tower. The lower liquid return ring may be provided in a ring shape on the inner wall of the reaction tower.

The upper liquid return structure may have either a flue protrusion or an upper liquid return ring. The exhaust gas treatment device may further include a lower liquid return ring. The lower liquid return ring may protrude from the inner wall of the reaction tower. The lower liquid return ring may be provided in a ring shape on the inner wall of the reaction tower.

The inner diameters of the flue protrusion, upper liquid return ring, and lower liquid return ring may be smaller in the order of the flue protrusion, upper liquid return ring, and lower liquid return ring.

The upper liquid return ring may have a flange part and a cylindrical part. The flange portion may contact the inner wall of the reducer portion. The cylindrical portion may be provided in contact with the inner diameter of the flange portion.

The cylindrical portion of the upper liquid return ring may have a truncated cone shape. The frustoconical shape may have an inner surface parallel to the inner wall of the reducer portion.

The flange part of the upper liquid return ring may be provided orthogonal to the inner wall of the reducer part.

The cylindrical part of the upper liquid return ring may be cylindrical. The cylindrical shape may have an inner surface parallel to the inner wall of the reaction tower. The flange portion of the upper liquid return ring may be provided orthogonal to the inner wall of the reducer portion.

The flue protrusion may have a sidewall having a plurality of openings.

The area of each opening in the plurality of openings of the flue protrusion is the area of each opening in the plurality of openings provided in the upper liquid return ring and the area of each opening in the plurality of openings provided in the lower liquid return ring. Smaller than that.

At least a part of the flue protrusion may have a cylindrical portion. The cylindrical portion may have a truncated cone shape whose inner diameter increases toward the bottom side.

The flue protrusion may further include a flue liquid return ring. The flue portion liquid return ring may protrude inward from the truncated cone-shaped cylindrical portion.

The exhaust gas treatment apparatus may further include a trunk pipe, a plurality of branch pipes, and a plurality of injection units. The trunk tube may carry liquid. The main pipe may extend in the height direction in the internal space of the reaction tower. The plurality of branch pipes may be provided at different height positions. The plurality of branch pipes may be provided extending from the outer wall of the trunk pipe toward the inner wall of the reaction tower. The plurality of ejection units may eject the liquid supplied from the trunk tube. The plurality of injection units may be provided in each of the plurality of branch pipes. In the branch pipe located on the uppermost side among the plurality of branch pipes, the main direction defined by the center of the spray angle in the plurality of jetting units that jet the liquid may be inclined toward the bottom side.

The branch pipe located at the top of the plurality of branch pipes may be located inside the reducer section.

Note that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

It is a figure which shows the outline | summary of the waste gas processing apparatus 100 in 1st Embodiment. It is a figure which shows the outline | summary of the waste gas processing apparatus 110 in 2nd Embodiment. It is a figure which shows the outline | summary of the waste gas processing apparatus 120 in 3rd Embodiment. It is a figure which shows the outline | summary of the waste gas processing apparatus 130 in 4th Embodiment. It is a figure which shows the outline | summary of the waste gas processing apparatus 140 in 5th Embodiment. It is a figure which shows the outline | summary of the waste gas processing apparatus 150 in 6th Embodiment. (A) is a figure which shows the cross section of the upper liquid return ring 50. FIG. (B) is a view showing the upper surface of the upper liquid return ring 50. FIG. (A) to (c) are cross-sectional views showing modifications of the upper liquid return ring 50. (A) to (c) are cross-sectional views showing other modified examples of the upper liquid return ring 50. It is a figure which shows the 1st modification of the flue protrusion part. It is a figure which shows the 2nd modification of the flue protrusion part. (A) And (b) is a figure explaining the main direction 26 in the injection part 24 of the branch pipe 22 located in the uppermost part 12 side. It is a figure which shows the outline | summary of the waste gas processing apparatus 160 in 7th Embodiment.

Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

FIG. 1 is a diagram showing an outline of an exhaust gas treatment apparatus 100 in the first embodiment. FIG. 1 is a front view of the exhaust gas treatment apparatus 100. FIG. 1 shows a cross section of the exhaust gas treatment apparatus 100. However, for the purpose of facilitating understanding, the trunk tube 20, the branch tube 22, the injection unit 24, the liquid introduction unit 28, and the baffle 29 show side surfaces instead of cross sections. Moreover, the exhaust gas introduction part 16 provided before the paper surface of the reaction tower 10 is shown with a dotted line.

In this example, the longitudinal direction of the reaction tower 10 is the z direction. The z direction is equal to the height direction from the bottom 14 side to the top 12 side of the reaction tower 10. The x and y directions are perpendicular to each other. In this example, the x, y and z directions constitute a right-handed system. The z direction is a direction perpendicular to a plane having x and y directions. The z direction may be a direction perpendicular to the floor of the ship or a direction perpendicular to the ground. However, the z direction is not limited to the examples of these directions. The z direction may be a direction parallel to the ground. In this example, the + z direction may be referred to as “upper”, “upward”, or “upper”, and the −z direction may be referred to as “lower”, “lower”, “lower”, or “bottom”.

The exhaust gas treatment apparatus 100 includes a reaction tower 10, a reducer unit 30, a flue unit 40, and an upper liquid return structure 60. The upper liquid return structure 60 includes a flue protrusion 42 or an upper liquid return ring 50 described later. The upper liquid return structure 60 of this example is a flue protrusion 42.

The reaction tower 10 and the flue section 40 of this example have a cylindrical internal space 15 extending in the height direction. Moreover, the reducer part 30 of this example has the internal space 15 of truncated cone shape. The internal space 15 in the reaction tower 10, the reducer part 30 and the flue part 40 of this example has a common central axis 11. The central axis 11 in this example is parallel to the z direction. The central axis 11 in this example is also the central axis of the trunk tube 20.

In the xy plane located above the exhaust gas introduction part 16, the distance from the central axis 11 to the inner wall of the reaction tower 10 is constant. Similarly, in other xy planes, the distance from the central axis 11 to the inner walls of the flue 40 and the flue protrusion 42 is constant. Further, in another xy plane, the distance from the central axis 11 to the inner wall of the reducer unit 30 is constant. Note that the distance from the central axis 11 to the inner wall of the reducer portion 30 gradually decreases as the direction proceeds in the + z direction.

The reaction tower 10 has an exhaust gas introduction part 16 on the side surface on the bottom part 14 side. The exhaust gas introduction part 16 may be a conduit having a rectangular cross section when the reaction tower 10 is viewed from the front. The exhaust gas introduction part 16 may have a longitudinal part extending in a direction perpendicular to a rectangular cross section. In this example, the longitudinal part of the exhaust gas introduction part 16 is parallel to the x direction. The longitudinal part of the exhaust gas introduction part 16 of this example has an inner side wall 17 and an outer side wall 18. In this example, the outer side wall 18 of the exhaust gas introduction part 16 extends in the tangential direction of the outer diameter of the reaction tower 10. Further, the inner side wall 17 of the exhaust gas introduction part 16 extends in a direction intersecting with the side wall of the reaction tower 10.

The exhaust gas is introduced into the reaction tower 10 from the exhaust gas introduction part 16 located on the bottom 14 side. The exhaust gas may be exhaust gas discharged from a power device such as a ship engine. The exhaust gas is introduced into the reaction tower 10 from the exhaust gas introduction unit 16 so as to swirl in a predetermined swirling direction inside the reaction tower 10. The exhaust gas of this example rises while spirally turning in the internal space 15 of the reaction tower 10. By exhausting the liquid inside the reaction tower 10, the exhaust gas is washed. Thereafter, the exhaust gas is discharged from the flue portion 40 to the outside of the exhaust gas processing apparatus 100.

The reducer unit 30 is provided above the reaction tower 10. The reducer part 30 may be a joint part that connects two cylinders having different diameters. The reducer portion 30 has a small diameter portion 32 at an end portion in the height direction, and has a large diameter portion 34 at an end portion in the direction opposite to the height direction. In this example, the small diameter part 32 of the reducer part 30 is connected to the flue part 40, and the large diameter part 34 of the reducer part 30 is connected to the reaction tower 10. That is, the reducer section 30 of this example connects the reaction tower 10 and the flue section 40 having an inner diameter smaller than that of the reaction tower 10.

Thereby, the inner diameter can be gradually reduced from the upper part 12 of the reaction tower 10 to the flue section 40. Therefore, the pressure loss in the exhaust gas treatment device 100 can be reduced by directly connecting the reaction tower 10 and the flue section 40 as compared with the case where the inner diameter of the cylinder changes discontinuously in the height direction.

In this example, a part of the flue section 40 is provided extending to the reducer section 30. That is, a part of the flue portion 40 extending in the −z direction from the top of the reducer portion 30 is referred to as a flue protrusion 42. The remaining part of the flue section 40 is provided above the reducer section 30. In the small diameter part 32 of the reducer part 30, the flue protrusion part 42 and the reducer part 30 may be fixed. In this example, the outer diameter of the flue protrusion 42 and the inner diameter of the small diameter portion 32 of the reducer portion 30 coincide.

In this example, the reaction tower 10 is not provided with a liquid return structure, but the reducer section 30 is provided with a liquid return structure. The upper liquid return structure 60 of this example is a flue protrusion 42 provided in the reducer part 30. Thereby, the height direction length of the reaction tower 10 can be reduced while providing the liquid return structure. Therefore, the height direction length of the reaction tower 10 can be adapted to the size of the interior of the ship. The exhaust gas treatment apparatus 100 of this example is particularly suitable for a ship or the like that has no sufficient installation space. Further, in the reducer section 30, since the inner diameter gradually decreases from the upper part 12 of the reaction tower 10 to the flue section 40, the closer the flue section 40 is, the higher the swirling speed of the exhaust gas swirl flow, and The distance between the inner surface of the reducer part 30 and the flue part 40 is shortened. Therefore, the mist-like liquid may be easily discharged from the flue portion 40 to the outside. However, in the exhaust gas treatment apparatus 100 of this example, since the upper liquid return structure 60 is provided, the mist-like liquid discharged outside from the flue portion 40 can be reduced.

The reaction tower 10 of this example has a length in the height direction from the bottom 14 to the top 12 of 3 [m] and an inner diameter of 700 [mm]. Further, the reducer portion 30 of this example has a length in the height direction from the large diameter portion 34 to the small diameter portion 32 of 654 [mm]. The inner diameter of the small diameter portion 32 of the reducer portion 30 may be about 60% of the large diameter portion 34. The inner diameter of the small diameter portion 32 of the reducer portion 30 of this example is 420 [mm]. In this example, the length from the uppermost part (position of the small diameter part 32) of the reducer part 30 to the lower end of the flue protrusion 42 is referred to as the protrusion length of the flue protrusion 42. The protrusion length of the flue protrusion 42 may be 50 [%] or less of the length of the reducer 30 in the z direction, or 20 [%] or less. The protrusion length of the flue protrusion 42 in this example is 100 [mm].

The exhaust gas treatment apparatus 100 includes a drainage outlet 19, a trunk pipe 20, a branch pipe 22, an injection part 24, a liquid introduction part 28, and a baffle 29. The bottom part 14 of the reaction tower 10 may function as a drainage storage part that temporarily stores the liquid that has been dropped after being jetted inside the reaction tower 10. The liquid stored in the bottom 14 may finally be discharged out of the reaction tower 10 from the drainage outlet 19.

The liquid introduction part 28 of this example is introduced into the inside from the side surface of the reaction tower 10 in the vicinity of the bottom 14 of the reaction tower 10. The liquid introducing portion 28 in this example is a tube bent into an L shape. The liquid introduction part 28 of this example is watertightly connected to the trunk pipe 20 in parallel with the central axis 11. Seawater, lake water, river water, or alkaline liquid is introduced into the liquid introduction unit 28 from the outside of the reaction tower 10 using a pump or the like. The liquid introduction unit 28 and the trunk tube 20 are fluidly connected, and the liquid introduced into the liquid introduction unit 28 is supplied to the trunk tube 20.

The baffle 29 in this example is installed in the liquid introduction unit 28. The baffle 29 may have a plane parallel to the xy plane. The baffle 29 of this example is a disk having a through opening through which the trunk tube 20 can pass. The baffle 29 is provided closer to the bottom 14 than the exhaust gas introduction part 16. The baffle 29 may have a function of dividing the reaction tower 10 into a region where exhaust gas is introduced and a region where waste water is stored.

The trunk pipe 20 of this example extends in the height direction in the internal space 15 of the reaction tower 10. The trunk tube 20 may transport the liquid supplied from the liquid introduction unit 28 in the height direction. The trunk pipe 20 is provided with a plurality of branch pipes 22. The trunk tube 20 and the branch tube 22 are fluidly connected so that the liquid is supplied from the trunk tube 20 to the branch tube 22.

The plurality of branch pipes 22 are provided extending from the outer wall of the trunk pipe 20 toward the inner wall of the reaction tower 10. In this example, one end in the longitudinal direction of the branch pipe 22 may be welded to the trunk pipe 20. In this example, four branch pipes 22-A, 22-B, 22-C and 22-D are provided at the same height position. The four branch pipes 22-A to 22-D form a cross when the trunk pipe 20 is viewed from above. Note that the branch pipe 22-D is omitted in FIG.

The branch pipes 22-1A to 22-nA in this example are provided so as to overlap in the height direction. The branch pipes 22-1A to 22-nA of the present example are provided at different height positions spaced apart at a constant interval in the height direction. Note that n is a natural number of 2 or more. In this example, n = 8. The pitch in the height direction of the branch pipes 22 may be 0.3 [m]. The branch pipes 22-1B to 22-nB are also provided at different height positions by a predetermined pitch. The same applies to the branch pipe 22-1C to the branch pipe 22-nC and the branch pipe 22-1D to the branch pipe 22-nD.

A plurality of injection units 24 are provided in each of the plurality of branch pipes 22. In this example, two jet parts 24 are provided in one branch pipe 22. In addition, the number of the injection parts 24 provided in one branch pipe 22 is not limited to two, and may be three or more. The injection unit 24 may be connected to the branch pipe 22 by screwing means, or may be connected to the branch pipe 22 by welding.

The injection unit 24 injects the liquid supplied from the trunk tube 20 inside the reaction tower 10. The ejected liquid changes into a fine water droplet or a mist. By bringing the injected liquid and exhaust gas into gas-liquid contact, sulfur oxides and the like in the exhaust gas are absorbed by the liquid. Thereby, exhaust gas can be washed. The ejection unit 24 may be a spray nozzle that ejects liquid in an empty cone shape. In this example, the injection port of the injection part 24 is provided in the part which attached | subjected x mark of FIG. The injection unit 24 may inject the liquid so as to assist the swirling flow of the exhaust gas.

FIG. 2 is a diagram showing an outline of the exhaust gas treatment device 110 in the second embodiment. The exhaust gas treatment device 110 of this example does not have the flue protrusion 42. The bottom part of the flue part 40 of this example is fixed on the small diameter part 32 of the reducer part 30. In this example, the inner diameter of the flue portion 40 and the inner diameter of the small diameter portion 32 of the reducer portion 30 coincide. The upper liquid return structure 60 in this example is an upper liquid return ring 50. This is different from the first embodiment. Other points are the same as in the first embodiment.

The upper liquid return ring 50 has a flange portion 52 and a cylindrical portion 54. The upper liquid return ring 50 protrudes from the inner wall of the reducer part 30. The upper liquid return ring 50 is provided in a ring shape on the inner wall of the reducer portion 30. A circumferential portion of the outer diameter of the flange portion 52 is fixed in contact with the inner wall of the reducer portion 30. As an example of a method for fixing the flange portion 52 to the reducer portion 30, the flange portion 52 may be passed through the reducer portion 30. That is, the outer diameter of the flange portion 52 may protrude from the outer wall of the reducer portion 30. The protruding portion may be fixed to the reducer portion 30 by a fixing member.

The cylindrical portion 54 is provided in contact with the inner diameter of the flange portion 52. The cylindrical portion 54 of this example is provided closer to the central axis 11 than the inner diameter of the flange portion 52. The shape of the cylindrical portion 54 may be a cylindrical tube or a truncated cone tube. However, the cylindrical part 54 of this example is a cylindrical cylinder.

The upper liquid return ring 50 of this example has a function of preventing the mist-like liquid from being discharged from the flue portion 40 to the outside. For example, the upper liquid return ring 50 prevents the mist-like liquid from rising near the inner surface of the reducer unit 30.

The upper liquid return ring 50 of this example has an opening 56 in the flange portion 52. The opening 56 is provided through the flange portion 52. By providing the opening 56, the liquid staying in the flange portion 52 can fall downward due to its own weight. The dropped liquid is finally discharged out of the exhaust gas treatment device 110 from the drainage outlet 19.

In this example, the liquid return structure is provided in the reducer section 30 but is not provided in the reaction tower 10. The upper liquid return structure 60 of this example is an upper liquid return ring 50 provided in the reducer unit 30. Thereby, the height direction length of the reaction tower 10 can be reduced while providing the liquid return structure. Therefore, the height direction length of the reaction tower 10 can be adapted to the size of the interior of the ship.

FIG. 3 is a diagram showing an outline of the exhaust gas treatment device 120 in the third embodiment. The upper liquid return structure 60 of this example includes both the flue protrusion 42 of the first embodiment and the upper liquid return ring 50 of the second embodiment. In this respect, this example is different from the first and second embodiments. Since this example has both the flue protrusion 42 and the upper liquid return ring 50, the liquid discharged outside from the flue 40 can be further reduced than in the first and second embodiments. In addition, as in the first and second embodiments, the length in the height direction of the reaction tower 10 can be reduced while providing a liquid return structure.

FIG. 4 is a diagram showing an outline of the exhaust gas treatment device 130 in the fourth embodiment. The exhaust gas treatment device 130 of this example includes a flue protrusion 42 as the upper liquid return structure 60 and a lower liquid return ring 70. The exhaust gas treatment device 130 of this example is different from the first embodiment in that it includes a lower liquid return ring 70.

The lower liquid return ring 70 has the same function as the upper liquid return ring 50. The lower liquid return ring 70 may have the same configuration as the upper liquid return ring 50. The lower liquid return ring 70 has a flange portion 72 and a cylindrical portion 74. The flange portion 72 has an opening 76. The opening 76 is provided through the flange portion 72. The lower liquid return ring 70 is provided in a ring shape on the inner wall of the reaction tower 10 and protrudes from the inner wall of the reaction tower 10. The flange portion 72 is in contact with the inner wall of the reaction tower 10. The outer diameter of the flange portion 72 of this example is fixed to the inner wall of the reaction tower 10. The cylindrical portion 74 is provided in contact with the position of the inner diameter of the flange portion 72. The cylindrical portion 74 of this example is connected to the flange portion 72 and is provided closer to the central axis 11 than the flange portion 72.

In this example, since one lower liquid return ring 70 is provided in the reaction tower 10 and the flue protrusion 42 is provided in the reducer part 30, the liquid discharged outside from the flue part 40 is the first embodiment. Can be further reduced.

FIG. 5 is a diagram showing an outline of the exhaust gas treatment apparatus 140 in the fifth embodiment. The exhaust gas treatment device 130 of this example includes an upper liquid return ring 50 as an upper liquid return structure 60 and a lower liquid return ring 70. The exhaust gas treatment device 130 of this example is different from the second embodiment in that it includes a lower liquid return ring 70. However, the upper liquid return ring 50 is the same as that of the second embodiment, and the lower liquid return ring 70 is the same as that of the fourth embodiment.

Also in this example, the reaction tower 10 is provided with one lower liquid return ring 70. Therefore, the height in the height direction of the reaction column 10 can be reduced as compared with the case where a plurality of lower liquid return rings 70 are provided in the reaction column 10. Furthermore, in this example, since the reaction tower 10 has one lower liquid return ring 70 and the reducer section 30 has one upper liquid return ring 50, the liquid discharged from the flue section 40 can be discharged outside. This can be further reduced than in the second embodiment.

FIG. 6 is a diagram showing an outline of the exhaust gas treatment apparatus 150 in the sixth embodiment. The upper liquid return structure 60 of this example has both the flue protrusion 42 and the upper liquid return ring 50. In addition, the exhaust gas treatment apparatus 150 of this example includes a lower liquid return ring 70 in the reaction tower 10. This is different from the first to fifth embodiments.

Also in this example, the length in the height direction of the reaction tower 10 can be reduced as compared with the case where a plurality of lower liquid return rings 70 are provided in the reaction tower 10. Furthermore, the liquid discharged | emitted outside from the flue part 40 can be further reduced rather than any of 1st to 5th embodiment.

In this example, the inner diameter of the flue protrusion 42 is R1, the inner diameter of the upper liquid return ring 50 is R2, and the inner diameter of the lower liquid return ring 70 is R3. In this example, the inner diameter is made smaller toward the upper part of the exhaust gas treatment device 150. That is, in this example, R1, R2, and R3 are smaller in this order. R1, R2 and R3 satisfy the relationship of R1 <R2 <R3. Thereby, compared with the case where it is R2 <R1, R3 <R2, or R3 <R1, the pressure loss of the waste gas in the reaction tower 10 can be reduced. The relationship of R1 <R2 <R3 may be applied in the third to fifth embodiments (FIGS. 3 to 5).

FIG. 7A is a view showing a cross section of the upper liquid return ring 50. FIG. 7B is a view showing the upper surface of the upper liquid return ring 50. The configuration of the upper liquid return ring 50 in the yz section (FIG. 7A) has already been described, and thus the description thereof is omitted. As shown in FIG. 7B, the flange portion 52 is provided with a plurality of openings 56. Each center of the plurality of openings 56 may be provided on a circumference having a predetermined diameter. The predetermined diameter may be larger than the inner diameter of the flange portion 52 and smaller than the outer diameter of the flange portion 52.

The swirl flow of exhaust gas is stronger on the inner wall side of the reaction tower 10 than the central shaft 11. Similarly, the swirling flow of exhaust gas is stronger on the inner wall side of the reducer portion 30 than the central shaft 11. Therefore, the centers of the plurality of openings 56 may be closer to the inner diameter than the outer diameter of the flange portion 52. For example, the predetermined diameter at which the centers of the plurality of openings 56 are provided is larger than the inner diameter of the flange portion 52 and not more than half of the sum of the inner diameter and the outer diameter of the flange portion 52. Thereby, the liquid falling from the opening 56 can be prevented from being hindered by the upward flow of the exhaust gas.

FIG. 8A to FIG. 8C are cross-sectional views showing modifications of the upper liquid return ring 50. FIG. The cylindrical portion 54 in FIGS. 8A and 8B has a truncated cone shape having an inner side surface 55 parallel to the inner wall of the reducer portion 30. Thereby, the pressure loss from the large diameter part 34 of the reducer part 30 to the small diameter part 32 can be reduced. On the other hand, the cylindrical portion 54 in FIG. 8C has a cylindrical shape having an inner side surface 55 parallel to the inner wall of the reaction tower 10.

8 (a) and 8 (c), the flange portion 52 is provided orthogonal to the inner wall of the reducer portion 30. Thereby, the internal diameter of the flange part 52 is located below the outer diameter. A groove portion formed by the upper portion of the flange portion 52 and the outer surface 57 of the cylindrical portion 54 is a right angle in FIG. 8A and an acute angle in FIG. 8C. The right-angle and acute-angle groove portions can easily store liquid as compared with the example of the obtuse-angle groove portion in FIG. Therefore, the liquid falls easily due to its own weight.

Note that the upper liquid return ring 50 in FIG. 8B may have a portion that protrudes further outward from the outer diameter of the flange portion 52. The protruding portion may be inserted into the reducer portion 30 and pulled out to the outside of the reducer portion 30 and the drawn portion may be screwed. Thereby, installation of the upper liquid return ring 50 is completed. Therefore, the upper liquid return ring 50 of FIG. 8B is easier to install on the reducer unit 30 than the examples of FIGS. 8A and 8C. Further, in the upper liquid return ring 50 of FIG. 8C, the angle α formed by the bottom portion of the flange portion 52 and the outer surface 57 of the cylindrical portion 54 is larger than the example of FIGS. 8A and 8B. Therefore, in the example of FIG. 8C, the liquid that rises in the vicinity of the inner wall of the reducer portion 30 and reaches the upper liquid return ring 50 is most easily collected.

FIG. 9A to FIG. 9C are cross-sectional views showing other modified examples of the upper liquid return ring 50. 9A to 9C form an acute angle with the inner wall of the reducer portion 30. FIG. Accordingly, the inner diameter of the flange portion 52 is located above the outer diameter of the flange portion 52.

9A, the groove portion formed by the upper portion of the flange portion 52 and the outer surface 57 of the cylindrical portion 54 has an obtuse angle. The cylindrical part 54 may be parallel to the reducer part 30. In FIG. 9A, the inner surface 55 and the outer surface 57 of the cylindrical portion 54 are parallel to the inner wall of the reducer portion 30.

9B, the groove portion formed by the upper portion of the flange portion 52 and the outer surface 57 of the cylindrical portion 54 has an obtuse angle. The cylindrical portion 54 may be parallel to the reaction tower 10. In FIG. 9B, the inner side surface 55 and the outer side surface 57 of the cylindrical portion 54 are each parallel to the inner wall of the reaction tower 10.

9C, the groove portion formed by the upper portion of the flange portion 52 and the outer surface 57 of the cylindrical portion 54 is a right angle. In FIG.9 (c), the flange part 52 and the cylindrical part 54 are orthogonally crossed. In the example of FIG. 9A to FIG. 9C, the liquid accumulates in a groove portion formed by the inner wall of the reducer portion 30 and the upper portion of the flange portion 52. The accumulated liquid flows out from the opening 56 and sequentially travels along the lower surface of the flange portion 52, the inner wall of the reducer portion 30, and the inner wall of the reaction tower 10. Thus, the liquid accumulated in the upper liquid return ring 50 can be discharged.

FIG. 10 is a view showing a first modification of the flue protrusion 42. The flue protrusion 42 of this example has a side wall 47 having a plurality of openings 46. The opening 46 in this example is a circular opening that penetrates the side wall 47. However, the opening 46 may have a mesh shape or a slit shape. The exhaust gas can pass through the opening 46. Therefore, as compared with the case where the opening 46 is not provided, the pressure loss due to the provision of the flue protrusion 42 can be further reduced. Further, the flue protrusion 42 can collect liquid having a diameter larger than that of the opening 46 at the opening 46.

In this example, the area of each opening 46 in the side wall 47 of the flue protrusion 42 is S1. The area of each opening 56 of the upper liquid return ring 50 is S2. S2 is the area of one opening 56 when the flange portion 52 is viewed from above. Furthermore, the area of each opening 76 of the lower liquid return ring 70 is S3. S3 is the area of one opening 76 when the flange portion 72 is viewed from above. In this example, S1 is smaller than S2 and S3. The particle size of the liquid tends to decrease as it goes upward in the height direction. Therefore, compared with the case where S1 is made larger than S2 and S3, the liquid collection performance can be improved. As a preferred example, the size of the opening area may satisfy the relationship of S1 <S2 <S3.

The mist-like liquid is pressed against the inner wall of the reducer 30 by the centrifugal force caused by the swirling flow of the exhaust gas, and falls by its own weight through each opening 56. Therefore, the particle size of the liquid dropped by its own weight tends to increase as it goes down. Since the liquid becomes heavier as the particle size increases, the influence of the swirling flow of the exhaust gas is weakened. As a result, the liquid drop due to its own weight is more likely to occur in the openings 56 located below. Of course, the flue protrusion 42 of this example may be applied to the first, third, fourth and sixth embodiments.

FIG. 11 is a view showing a second modification of the flue protrusion 42. At least a part of the flue protrusion 42 may have a truncated cone-shaped cylindrical portion whose inner diameter increases toward the bottom 14 side. The flue protrusion 42 of this example is a truncated cone-shaped cylindrical portion whose inner diameter decreases as the whole advances in the height direction. Thereby, compared with the case where a cylindrical part is a cylinder-shaped cylinder, the pressure loss in the flue protrusion part 42 can further be reduced.

The flue protrusion 42 may further include a flue portion liquid return ring 48 that protrudes inward from the truncated cone-shaped cylindrical portion. The flue portion liquid return ring 48 of this example protrudes downward from the small diameter portion 32 of the reducer portion 30. The flue portion liquid return ring 48 of this example may form a predetermined obtuse angle with the cylindrical portion of the flue portion 40. In this example, since the scattering of the liquid above the reducer part 30 can be suppressed, the corrosion of the flue part 40 above the reducer part 30 can be reduced. Of course, the flue protrusion 42 of this example may be applied to the first, third, fourth and sixth embodiments.

12 (a) and 12 (b) are diagrams for explaining the main direction 26 in the injection section 24 of the branch pipe 22 located on the uppermost side 12 side. In this example, the main direction 26 of the liquid ejected from the ejection unit 24 is defined by the center of the ejection angle 25 in the ejection unit 24. The ejection angle 25 is generally known as an angle at which the liquid spreads in the vicinity of the ejection unit 24 such as a spray nozzle. FIG. 12A shows an example in which the main direction 26 of the uppermost injection unit 24 is parallel to the xy plane. On the other hand, FIG. 12B is an example in which the main direction 26 of the uppermost injection unit 24 is inclined to the bottom 14 side with respect to the example of FIG. In the example of FIG. 12B, the amount of liquid scattered in the height direction can be reduced as compared with FIG. Thereby, compared with the above-mentioned example, it can suppress that a liquid is discharged | emitted from the flue part 40 outside. Of course, the example of FIG. 12B may be applied to the above-described embodiment and modifications.

FIG. 13 is a diagram showing an outline of the exhaust gas treatment device 160 in the seventh embodiment. The branch pipe 22 located at the top of the plurality of branch pipes 22 may be located inside the reducer unit 30. The branch pipe 22 located at the uppermost part may be provided between the small diameter part 32 and the large diameter part 34 of the reducer part 30. In this example, there are four branch pipes 22 located at the top. In the present example, the four branch pipes 22 are provided between the upper liquid return ring 50 and the large diameter part 34 of the reducer part 30 in the height direction. This is different from the sixth embodiment. Other points are the same as in the sixth embodiment. In this example, the length in the height direction of the reaction tower 10 can be further reduced by providing the branch pipe 22 up to the reducer section 30 as compared with the sixth embodiment. In addition, as for the injection part 24 of the branch pipe 22 located in the uppermost part, the main direction 26 may incline to the bottom part 14 side like FIG.12 (b). Thereby, it is possible to suppress the liquid ejected from the ejection unit 24 of the uppermost branch pipe 22 from staying in the lower liquid return ring 70.

As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

The execution order of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior”. It should be noted that they can be implemented in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for the sake of convenience, it means that it is essential to carry out in this order is not.

10 .. Reaction tower, 11 .... Central axis, 12 .... Top, 14 .... Bottom, 15 .... Internal space, 16 .... Exhaust gas introduction part, 17 .... Inner side wall, 18 .... Outer side wall, 19 .... Drain outlet part, 20 ... trunk pipe, 22 ... branch pipe, 24 ... jet part, 25 ... jet angle, 26 ... main direction, 28 ... liquid introduction part, 29 ... baffle, 30 ... reducer , 32 ·· Small diameter portion, 34 · · Large diameter portion, 40 · · Flue portion, 42 · · Flue protrusion, 46 · · Opening, 47 · · Side wall, 48 · · Liquid return ring, · · · Upper liquid return ring, 52 ·· Flange portion, 54 ·· Tubular portion, 55 ·· Inner side surface, 56 ·· Opening, 57 · · Outer surface, 60 ··· Upper liquid return structure, 70 ··· Lower liquid return ring , 72 .. Flange part, 74 .. Cylindrical part, 76 .. Opening, 100 .. Exhaust gas treatment device, 110. Device, 120 ... exhaust gas treatment apparatus, 130 ... exhaust gas treatment apparatus, 140 ... exhaust gas treatment apparatus, 150 ... exhaust gas treatment apparatus, 160 ... exhaust gas treatment apparatus

Claims

An exhaust gas treatment device for treating exhaust gas,
A reaction tower having a cylindrical internal space extending in the height direction from the bottom side where the exhaust gas is introduced to the upper side where the exhaust gas is discharged, and injecting and cleaning liquid into the exhaust gas rising while turning,
A reducer provided above the reaction tower and connected to the reaction tower;
A flue portion at least partially provided above the reducer portion;
An exhaust gas treatment apparatus comprising an upper liquid return structure provided in the reducer section.
The upper liquid return structure includes a flue protrusion part of the flue part extending to the reducer part, and a ring formed on the inner wall of the reducer part, protruding from the inner wall of the reducer part. The exhaust gas treatment device according to claim 1, wherein the exhaust gas treatment device has at least one of an upper liquid return ring and
The upper liquid return structure has both the flue protrusion and the upper liquid return ring,
The exhaust gas treatment apparatus according to claim 2, further comprising a lower liquid return ring provided in a ring shape on the inner wall of the reaction tower and protruding from the inner wall of the reaction tower.
The upper liquid return structure has one of the flue protrusion and the upper liquid return ring,
The exhaust gas treatment apparatus according to claim 2, further comprising a lower liquid return ring provided in a ring shape on the inner wall of the reaction tower and protruding from the inner wall of the reaction tower.
The exhaust gas according to claim 3 or 4, wherein inner diameters of the flue protrusion, the upper liquid return ring, and the lower liquid return ring are smaller in order of the flue protrusion, the upper liquid return ring, and the lower liquid return ring. Processing equipment.
The upper liquid return ring is
A flange portion in contact with the inner wall of the reducer portion;
A cylindrical portion provided in contact with the inner diameter of the flange portion;
The exhaust gas treatment apparatus according to any one of claims 2 to 5, wherein:
The exhaust gas treatment apparatus according to claim 6, wherein the cylindrical portion of the upper liquid return ring has a truncated cone shape having an inner surface parallel to an inner wall of the reducer portion.
The exhaust gas treatment apparatus according to claim 7, wherein the flange portion of the upper liquid return ring is provided orthogonal to an inner wall of the reducer portion.
The cylindrical portion of the upper liquid return ring has a cylindrical shape having an inner surface parallel to the inner wall of the reaction tower,
The exhaust gas treatment apparatus according to claim 6, wherein the flange portion of the upper liquid return ring is provided orthogonal to an inner wall of the reducer portion.
The exhaust gas treatment apparatus according to claim 3 or 4, wherein the flue protrusion has a side wall having a plurality of openings.
The area of each opening in the plurality of openings of the flue protrusion is equal to the area of each opening in the plurality of openings provided in the upper liquid return ring and in the plurality of openings provided in the lower liquid return ring. The exhaust gas treatment apparatus according to claim 10, wherein the exhaust gas treatment apparatus is smaller than an area of each opening.
The exhaust gas treatment apparatus according to claim 10 or 11, wherein at least a part of the flue protrusion has a truncated cone-shaped cylindrical portion whose inner diameter increases toward the bottom side.
The exhaust gas treatment device according to claim 12, wherein the flue protrusion further includes a flue portion liquid return ring that protrudes inward from the cylindrical portion having a truncated cone shape.
A trunk pipe extending in the height direction in the internal space of the reaction tower and conveying a liquid;
A plurality of branch pipes provided extending from the outer wall of the trunk pipe toward the inner wall of the reaction tower, each provided at different height positions;
A plurality of jetting units each provided in the plurality of branch pipes and jetting liquid supplied from the trunk pipe;
The main direction prescribed | regulated by the center of the injection angle in the said several injection part which injects the said liquid in the branch pipe located in the said most upper side among these several branch pipes inclines to the said bottom part side. The exhaust gas treatment apparatus according to any one of 1 to 13.
The exhaust gas treatment apparatus according to claim 14, wherein a branch pipe located at an uppermost portion of the plurality of branch pipes is located inside the reducer portion.