JP2021084043A - Exhaust gas treatment device - Google Patents

Abstract

To provide an exhaust gas treatment device where the suppression of the resonance of a branch pipe installed in the exhaust gas treatment device is desired when the exhaust gas treatment device is vibrated.SOLUTION: An exhaust gas treatment device comprises: a reaction tower where an exhaust gas is introduced and a liquid treating the exhaust gas is supplied; one or a plurality of trunk pipes which are arranged at the inside of the reaction tower, supplied with the liquid and extended in an exhaust direction from the introduction side of the exhaust gas; and one or a plurality of branch pipes which are arranged at the inside of the reaction tower, whose one end is connected to the trunk pipe, which are extended in a predetermined direction and which are supplied with the liquid. An angle between one trunk pipe and one branch pipe is larger than 0 degree and smaller than 90 degrees.SELECTED DRAWING: Figure 3

Description

The present invention relates to an exhaust gas treatment device.

Conventionally, there is known an exhaust gas treatment device in which an absorbent that absorbs sulfur oxides flows into a branch pipe and the branch pipe is provided so as to be inclined in the horizontal direction (see, for example, Patent Document 1).
Patent Document 1 Japanese Patent Application Laid-Open No. 9-22256

In the exhaust gas treatment device, it is preferable that the resonance of the branch pipe provided in the exhaust gas treatment device is suppressed when the exhaust gas treatment device vibrates.

In the first aspect of the present invention, an exhaust gas treatment device is provided. The exhaust gas treatment device is provided in a reaction tower in which the exhaust gas is introduced and the liquid for treating the exhaust gas is supplied, and the liquid is supplied inside the reaction tower and extends in the direction from the introduction side to the discharge side of the exhaust gas. Alternatively, it comprises a plurality of trunk tubes and one or more branch tubes provided inside the reaction tower, one end of which is connected to the trunk tube, and which extends in a predetermined direction and is supplied with a liquid. The angle between one trunk and one branch is greater than 0 degrees and less than 90 degrees.

The angle formed by one trunk pipe and one branch pipe may be 80 degrees or more and less than 90 degrees.

The angle formed by one trunk pipe and one branch pipe may be 80 degrees or more and 87.5 degrees or less.

The other end of the branch tube may be connected to the side wall of the reaction column.

The first branch pipe of the plurality of branch pipes may be connected to one trunk pipe. The second branch pipe of the plurality of branch pipes may be connected to the one trunk pipe. The angle formed by one trunk pipe and the first branch pipe may be different from the angle formed by the one trunk pipe and the second branch pipe.

The first branch pipe may be connected to one trunk pipe at the first position in the extending direction of one trunk pipe. The second branch pipe may be connected to the one trunk pipe at a second position different from the first position in the extension direction of the one trunk pipe. The angle formed by one trunk pipe and the first branch pipe may be greater than 0 degrees and less than 90 degrees on one side in the extending direction of the one trunk pipe. The angle formed by the one trunk pipe and the second branch pipe may be greater than 0 degrees and less than 90 degrees on the other side in the extending direction of the one trunk pipe.

In a plane orthogonal to the extending direction of one trunk pipe, the angle formed by the direction from the one trunk pipe to the other end of the first branch pipe and the extending direction of the first branch pipe is the one. It may be greater than 0 degrees and less than 90 degrees on one side in a plane orthogonal to the extending direction of the trunk tube. The angle between the direction from the one trunk pipe to the other end of the second branch pipe and the extension direction of the second branch pipe is on the other side in the plane orthogonal to the extension direction of the one trunk pipe. It may be greater than 0 degrees and less than 90 degrees.

The first trunk pipe of the plurality of trunk pipes may be provided on the exhaust gas discharge side of the second trunk pipe of the plurality of trunk pipes in the extension direction of the trunk pipe. The first trunk canal may be connected to the first of the plurality of branch canals. The second trunk pipe may be connected to the second branch pipe of the plurality of branch pipes. The angle formed by the first trunk pipe and the first branch pipe and the angle formed by the second trunk pipe and the second branch pipe may be different.

The angle formed by the first trunk pipe and the first branch pipe may be greater than 0 degrees and less than 90 degrees on one side in the extension direction of the trunk pipe. The angle formed by the second trunk pipe and the second branch pipe may be greater than 0 degrees and less than 90 degrees on the other side in the extension direction of the trunk pipe.

In the direction orthogonal to the extending direction of the trunk pipe, the cross-sectional area of the first trunk pipe may be smaller than the cross-sectional area of the second trunk pipe. The angle formed by the second trunk pipe and the second branch pipe may be smaller than the angle formed by the first trunk pipe and the first branch pipe.

The second trunk pipe may be further provided with a connecting portion which is provided on the most exhaust gas introduction side in the extending direction of the trunk pipe and is connected to the bottom surface of the reaction tower. The angle formed by the second trunk pipe and the second branch pipe may be larger than the angle formed by the first trunk pipe and the first branch pipe.

The outline of the above invention does not list all the necessary features of the present invention. Sub-combinations of these feature groups can also be inventions.

It is a figure which shows an example of the exhaust gas treatment apparatus 100 which concerns on one Embodiment of this invention. It is a figure which shows an example in the top view of the exhaust gas treatment apparatus 100 shown in FIG. It is an enlarged view of the trunk pipe 12-3 and the branch pipe 13-9 to the branch pipe 13-12 in FIG. 1. It is an enlarged view of the trunk pipe 12-3, the branch pipe 13-12, and the side wall 15-1 in FIG. It is another enlarged view of the trunk pipe 12-3 and the branch pipe 13-9 to the branch pipe 13-12 in FIG. 1. It is a figure which shows an example of the response displacement D of the trunk pipe 12-3 shown in FIG. It is a figure which shows an example of the response displacement D of the trunk pipe 12-2. It is a figure which shows an example of the reduction rate of the response displacement D of the trunk pipe 12 shown in FIG. It is a figure which shows an example of the response displacement D of the trunk pipe 12-3 shown in FIG. It is a figure which shows an example of the response displacement D of the trunk pipe 12-2. It is a figure which shows an example of the reduction rate of the response displacement D of the trunk pipe 12 shown in FIG. It is a figure which shows an example of the reduction rate of the response displacement D of a trunk pipe 12. It is a figure which shows an example of the reduction rate of the response displacement D of a trunk pipe 12. It is another enlarged view of the trunk pipe 12-3 and the branch pipe 13-9 to the branch pipe 13-12 in FIG. 1. It is another enlarged view of the trunk pipe 12-3 and the branch pipe 13-9 to the branch pipe 13-11 in FIG. 1. It is another enlarged view of the trunk pipe 12-3 and the branch pipe 13-9 to the branch pipe 13-12 in FIG. 1. It is a figure which shows an example of the response displacement D of the trunk pipe 12-3 shown in FIG. It is a figure which shows an example of the response displacement D of the trunk pipe 12-2. It is a figure which shows an example of the reduction rate of the response displacement D of the trunk pipe 12 shown in FIG. It is a figure which shows an example of the response displacement D of the trunk pipe 12-3 shown in FIG. It is a figure which shows an example of the response displacement D of the trunk pipe 12-2. It is a figure which shows an example of the reduction rate of the response displacement D of the trunk pipe 12 shown in FIG. It is a figure which shows another example in the top view of the exhaust gas treatment apparatus 100 shown in FIG. It is a figure which shows another example in the top view of the exhaust gas treatment apparatus 100 shown in FIG. It is a figure which shows the form of connection between a trunk pipe 12 and a branch pipe 13 and the like collectively. It is a figure which shows an example of the response displacement of the trunk tube 12 in the case of the comparative embodiment and the first to third embodiments. It is a figure which shows an example of the response displacement of the trunk tube 12 in the case of the comparative embodiment and the first to third embodiments. It is an enlarged view of the trunk pipe 12-2 and the branch pipe 13-5 to the branch pipe 13-8, and the trunk pipe 12-3 and the branch pipe 13-9 to the branch pipe 13-12 in FIG. It is another enlarged view of the trunk pipe 12-2 and the branch pipe 13-5 to the branch pipe 13-8 in FIG. 1, and the trunk pipe 12-3 and the branch pipe 13-9 to the branch pipe 13-12. It is a figure which shows another example in the top view of the exhaust gas treatment apparatus 100 shown in FIG. It is a figure which shows an example of the response displacement D of the trunk pipe 12-3 shown in FIG. It is a figure which shows an example of the response displacement D of the trunk pipe 12-2. It is an enlarged view of the trunk pipe 12-1 and the branch pipe 13-1 to the branch pipe 13-4, and the trunk pipe 12-2 and the branch pipe 13-5 to the branch pipe 13-8 in FIG.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the inventions that fall within the scope of the claims. Also, not all combinations of features described in the embodiments are essential to the means of solving the invention.

FIG. 1 is a diagram showing an example of an exhaust gas treatment device 100 according to an embodiment of the present invention. The exhaust gas treatment device 100 includes a reaction tower 10, a trunk pipe 12, and a branch pipe 13. The exhaust gas treatment device 100 may include a ejection unit 14, a liquid introduction pipe 19, an exhaust gas introduction pipe 32, an exhaust pipe 20, a power unit 50, a pump 60, and a flow rate control unit 70.

The power unit 50 is, for example, an engine, a boiler, or the like. The power unit 50 discharges the exhaust gas 30. The exhaust gas introduction pipe 32 connects the power unit 50 and the reaction tower 10. Exhaust gas 30 is introduced into the reaction column 10. In this example, the exhaust gas 30 discharged from the power unit 50 is introduced into the reaction tower 10 through the exhaust gas introduction pipe 32.

The liquid 40 for treating the exhaust gas 30 is supplied to the reaction column 10. In this example, the liquid 40 is supplied to the reaction column 10 by the pump 60. The liquid 40 supplied to the reaction tower 10 treats the exhaust gas 30 inside the reaction tower 10. Treating the exhaust gas 30 means removing harmful substances contained in the exhaust gas 30. The liquid 40 becomes the drainage 46 after treating the exhaust gas 30.

The trunk pipe 12 and the branch pipe 13 are provided inside the reaction tower 10. One end of the branch pipe 13 is connected to the trunk pipe 12. The liquid 40 is supplied to the trunk pipe 12 and the branch pipe 13. In this example, the liquid 40 is supplied to the trunk pipe 12 by the pump 60. In this example, the liquid 40 supplied to the trunk pipe 12 is supplied to the branch pipe 13.

The ejection portion 14 may be provided inside the reaction tower 10. In this example, the liquid 40 supplied to the branch pipe 13 is ejected into the inside of the reaction tower 10 by the ejection portion 14.

The reaction tower 10 of this example has a side wall 15, a bottom surface 16, a gas discharge port 17, and a gas treatment unit 18. The reaction column 10 may have a columnar or hexagonal shape. In this example, the side wall 15 and the bottom surface 16 are the side surface and the bottom surface of the columnar or hexagonal reaction tower 10, respectively. The bottom surface 16 is a surface on which the drainage 46 (described later) falls and is a surface in contact with the gas treatment unit 18 inside the reaction tower 10. The side wall 15 is an inner surface in contact with the gas treatment unit 18 inside the reaction tower 10.

In the present specification, technical matters may be described using Cartesian coordinate axes of the X-axis, the Y-axis, and the Z-axis. In the present specification, the plane parallel to the bottom surface 16 of the reaction tower 10 is defined as the XY plane, and the direction from the bottom surface 16 toward the gas discharge port 17 (direction perpendicular to the bottom surface 16) is defined as the Z axis. In the present specification, a predetermined direction in the XY plane is defined as the X-axis direction, and a direction orthogonal to the X-axis in the XY plane is defined as the Y-axis direction.

In the present specification, the side of the gas discharge port 17 is referred to as "upper", and the side of the bottom surface 16 is referred to as "lower". The Z-axis direction may be the direction of gravity, and the XY plane may be a horizontal plane. In this example, the Z-axis direction is the direction of gravity, but the "up" and "down" directions are not limited to the direction of gravity. In the present specification, the top view refers to a case where the exhaust gas treatment device 100 is viewed from the gas discharge port 17 to the bottom surface 16 in the Z-axis direction. When the exhaust gas treatment device 100 is mounted on a ship or the like, the bottom surface 16 may be mounted on the ship.

The exhaust gas treatment device 100 may include a plurality of trunk pipes 12. The exhaust gas treatment device 100 of this example includes three trunk pipes (trunk pipe 12-1, trunk pipe 12-2, and trunk pipe 12-3). The trunk pipe 12 may extend in a direction (in this example, the Z-axis direction) from the introduction side (bottom surface 16 side) of the exhaust gas 30 to the discharge side (gas discharge port 17 side). In this example, the trunk pipe 12-1 is provided on the bottom surface 16 side in the Z-axis direction with respect to the trunk pipe 12-2, and the trunk pipe 12-2 is provided on the bottom surface 16 side in the Z-axis direction with respect to the trunk pipe 12-3. Has been done.

The flow rate control unit 70 controls the flow rate of the liquid 40 supplied to the reaction tower 10. The flow rate control unit 70 may have a valve 72. In this example, the flow rate control unit 70 controls the flow rate of the liquid 40 supplied from the pump 60 to the trunk pipe 12 by the valve 72. The flow rate control unit 70 of this example has three valves 72 (valve 72-1, valve 72-2 and valve 72-3). The flow rate control unit 70 of this example is the liquid 40 supplied to the trunk pipe 12-1, the trunk pipe 12-2, and the trunk pipe 12-3 by the valve 72-1, the valve 72-2, and the valve 72-3, respectively. Control the flow rate.

The liquid introduction pipe 19 introduces the liquid 40 from the outside to the inside of the reaction tower 10. The liquid introduction pipe 19 may penetrate the side wall 15. The liquid introduction pipe 19 of this example connects the valve 72 and the trunk pipe 12. The liquid introduction pipe 19 may extend in the XY plane. The exhaust gas treatment device 100 of this example includes three liquid introduction pipes 19 (liquid introduction pipe 19-1, liquid introduction pipe 19-2, and liquid introduction pipe 19-3). In this example, the liquid introduction pipe 19-1, the liquid introduction pipe 19-2, and the liquid introduction pipe 19-3 are connected to the trunk pipe 12-1, the trunk pipe 12-2, and the trunk pipe 12-3, respectively.

In the XZ cross section shown in FIG. 1, the side wall 15 provided with the exhaust gas introduction pipe 32 is referred to as a side wall 15-1, and the side wall 15 facing the side wall 15-1 in the X-axis direction is referred to as a side wall 15-2. However, since the side wall 15 surrounds the gas processing portion 18 in the XY cross section as described later, the side wall 15-1 and the side wall 15-2 are not different from each other. The side wall 15-1 and the side wall 15-2 are merely names for convenience in the XZ cross section.

In this example, the gas discharge port 17 is arranged at a position facing the bottom surface 16 in the central axis direction (Z-axis direction) of the columnar or hexagonal reaction tower 10. The gas treatment unit 18 is a space surrounded by a side wall 15, a bottom surface 16, and a gas discharge port 17. The gas treatment unit 18 is a space for treating the exhaust gas 30 inside the reaction tower 10.

The reaction tower 10 of this example has a gas introduction opening 11 for introducing the exhaust gas 30. In this example, the exhaust gas 30 is introduced into the gas treatment unit 18 from the exhaust gas introduction pipe 32 through the gas introduction opening 11. The gas introduction opening 11 may be provided on the side wall 15.

The exhaust gas 30 introduced into the reaction tower 10 is treated by the liquid 40 in the gas treatment unit 18. The inner wall of the gas treatment unit 18 is formed of a material that is durable against the exhaust gas 30, the liquid 40 (seawater or alkaline liquid), and the drainage 46. The material may be an iron material such as SS400, a copper alloy such as never brass, an aluminum alloy such as aluminum brass, a nickel alloy such as cupronickel, or stainless steel such as SUS316L.

The trunk pipe 12, the branch pipe 13, and the liquid introduction pipe 19 are made of a material that is durable against the liquid 40 and the drainage 46. The trunk pipe 12, the branch pipe 13, and the liquid introduction pipe 19 may be formed of the same material as the inner wall of the gas treatment unit 18, or may be formed of different materials.

The exhaust gas treatment device 100 may be a scrubber for ships. When the exhaust gas treatment device 100 is a scrubber for ships, the power unit 50 is, for example, the engine, boiler, etc. of the ship, and the exhaust gas 30 is, for example, the exhaust gas discharged from the engine, the boiler, and the liquid for treating the exhaust gas 30. 40 is, for example, seawater. The liquid 40 may be alkaline water to which at least one of sodium hydroxide (NaOH) and sodium hydrogen carbonate (Na ₂ CO _{3) is added.}

Exhaust gas 30 contains harmful substances such as sulfur oxides (SO _x). The sulfur oxide (SO _x ) is, for example, sulfurous acid gas (SO ₂ ). When the liquid 40 is an aqueous solution of _{sodium hydroxide (NaOH), the reaction between the sulfur dioxide gas (SO 2} ) contained in the exhaust gas 30 and sodium hydroxide (NaOH) is represented by the following chemical formula 1.
[Chemical formula 1]
SO ₂ + Na ⁺ + OH ⁻ → Na + HSO ₃ ⁻

As shown in Formula 1, sulfur dioxide (SO ₂₎ sulfite ions by a chemical reaction ^- a (HSO _3). Liquid 40 is sulfite ions by a chemical reaction ^- a drainage 46 containing (HSO _3). The drainage 46 may be discharged from the drainage pipe 20 to the outside of the exhaust gas treatment device 100.

The exhaust gas treatment device 100 may include a plurality of branch pipes 13. The exhaust gas treatment device 100 of this example includes branch pipes 13-1 to 13-12. In this example, the branch pipe 13-1 and the branch pipe 13-2 are the branch pipes 13 provided on the bottom surface 16 side in the Z-axis direction. In this example, the branch pipes 13-11 and the branch pipes 13-12 are the branch pipes 13 provided on the most gas discharge port 17 side in the Z-axis direction.

In this example, one end of the branch pipe 13-1 and the branch pipe 13-3 is connected to the trunk pipe 12-1, and the other end is connected to the side wall 15-2. In this example, one end of the branch pipe 13-2 and the branch pipe 13-4 is connected to the trunk pipe 12-1, and the other end is connected to the side wall 15-1. In this example, one end of the branch pipe 13-5 and the branch pipe 13-7 is connected to the trunk pipe 12-2, and the other end is connected to the side wall 15-2. In this example, one end of the branch pipe 13-6 and the branch pipe 13-8 is connected to the trunk pipe 12-2, and the other end is connected to the side wall 15-1. In this example, one end of the branch pipe 13-9 and the branch pipe 13-11 is connected to the trunk pipe 12-3, and the other end is connected to the side wall 15-2. In this example, one end of the branch pipe 13-10 and the branch pipe 13-12 is connected to the trunk pipe 12-3, and the other end is connected to the side wall 15-1.

The exhaust gas treatment device 100 may include a plurality of ejection portions 14. In this example, the ejection portions 14-1 to the ejection portions 14-12 are connected to the branch pipes 13-1 to 13-12, respectively. The gas introduction opening 11 may be provided below the ejection portion 14-1 (bottom surface 16 side).

A plurality of ejection portions 14 may be connected to one branch pipe 13. In this example, three ejection portions 14 are connected to one branch pipe 13. For example, three ejection portions 14-1 are connected to one branch pipe 13-1. The ejection portion 14 may eject the liquid 40 in the direction from the trunk pipe 12 to the side wall 15.

In FIG. 1, the angle formed by one trunk pipe 12 and one branch pipe 13 connected to the trunk pipe 12 is defined as an angle θ. In FIG. 1, the angle θ is shown as 90 degrees for convenience, but in the exhaust gas treatment device 100 of this example, the angle θ is larger than 0 degrees and less than 90 degrees.

FIG. 2 is a diagram showing an example of the exhaust gas treatment device 100 shown in FIG. 1 in a top view. In FIG. 2, the power device 50, the pump 60, the liquid introduction pipe 19, the exhaust gas introduction pipe 32, the flow rate control unit 70, and the gas discharge port 17 are omitted. FIG. 2 is an example of a top view of the inside of the reaction tower 10.

The reaction tower 10 of this example has a circular shape when viewed from above. A trunk tube 12 is provided inside the reaction tower 10. The central position of the reaction column 10 is defined as the central Ce. The central position of the trunk pipe 12 may be the central Ce. The reaction tower 10 and the trunk tube 12 of this example are columnar having the central Ce as the central axis and extending in the Z-axis direction. That is, the trunk tube 12 and the reaction tower 10 may be arranged concentrically in a top view.

The exhaust gas treatment device 100 may be a cyclone type scrubber in which the exhaust gas 30 spirally travels inside the reaction tower 10 from the introduction side to the discharge side of the exhaust gas 30 in the reaction tower 10. When the exhaust gas treatment device 100 is a cyclone type scrubber, the exhaust gas 30 swirls the gas treatment unit 18 in a spiral shape (cyclone shape), and the exhaust gas 30 is introduced (bottom surface 16 side) to an exhaust side (gas discharge port 17 side). Proceed to. In FIG. 2, the direction of rotation of the exhaust gas 30 is indicated by a thick arrow.

The exhaust gas treatment device 100 includes a branch pipe 13, a branch pipe 23, and a branch pipe 33. One end of the branch pipe 13, one end of the branch pipe 23, and one end of the branch pipe 33 are connected to the trunk pipe 12. The other end of the branch pipe 13, the other end of the branch pipe 23, and the other end of the branch pipe 33 may be connected to the side wall 15. The configuration of the branch pipe 23 and the branch pipe 33 may be the same as the configuration of the branch pipe 13. In top view, the angles of the branch pipe 23 and the branch pipe 33 with respect to the X-axis direction are different from the angles of the branch pipe 13 with respect to the X-axis direction.

In FIG. 2, in the plane orthogonal to the extending direction of the trunk pipe 12 (in the XY plane), three directions are indicated by broken lines of the AA'line, the BB'line, and the CC'line, respectively. ing. The AA'line, the BB'line and the CC'line pass through the central Ce. In this example, the AA'line is parallel to the X axis. The angle between the AA'line and the BB'line, the angle between the BB'line and the CC'line, and the angle between the CC'line and the AA'line are , 60 degrees, not necessarily 60 degrees. In this example, the angle between the AA'line and the BB'line, the angle between the BB'line and the CC'line, and the CC'and AA'lines. The angle between them is 60 degrees.

The branch pipe 13, the branch pipe 23, and the branch pipe 33 extend in a predetermined direction. In this example, the branch pipe 13, the branch pipe 23, and the branch pipe 33 extend in the directions of the AA'line, the BB' line, and the CC'line in the top view, respectively.

The exhaust gas treatment device 100 of this example includes branch pipes 23-1 to 23-12 and branch pipes 33-1 to 33-12. In FIG. 2, branch pipes 23-1 to 23-10 and branch pipes 33-1 to 33-10 are not shown. In this example, the branch pipe 23-1, the branch pipe 23-3, the branch pipe 23-5, the branch pipe 23-7, and the branch pipe 23-9 are arranged at positions overlapping with the branch pipe 23-11 in the top view. .. In this example, the branch pipe 23-2, the branch pipe 23-4, the branch pipe 23-6, the branch pipe 23-8, and the branch pipe 23-10 are arranged at positions overlapping with the branch pipe 23-12 in the top view. .. In this example, the branch pipes 33-1 to 33-12 are also arranged in the same manner.

The branch pipes 23-1 to 23-12 may be provided at the same position (height from the bottom surface 16) in the Z-axis direction as the branch pipes 13-1 to 13-12, respectively. The branch pipes 33-1 to 33-12 may be provided at the same positions in the Z-axis direction as the branch pipes 13-1 to 13-12, respectively.

The exhaust gas treatment device 100 may include a ejection portion 14, an ejection portion 24, and an ejection portion 34. In this example, the ejection portion 14, the ejection portion 24, and the ejection portion 34 are provided inside the reaction tower 10. In this example, the liquid 40 supplied to the branch pipe 13, the branch pipe 23, and the branch pipe 33 is ejected into the inside of the reaction tower 10 by the ejection portion 14, the ejection portion 24, and the ejection portion 34, respectively.

The configuration of the ejection portion 24 and the ejection portion 34 may be the same as the configuration of the ejection portion 14. In this example, the branch pipes 23-1 to 23-12 are connected to the ejection portions 24-1 to the ejection portions 24-12, respectively, and the branch pipes 33-1 to the branch pipes 33-12 are connected to the ejection portions, respectively. 34-1 to the ejection part 34-12 are connected.

A plurality of ejection portions 24 may be connected to one branch pipe 23. A plurality of ejection portions 34 may be connected to one branch pipe 33. In this example, one branch pipe 23 and one branch pipe 33 are connected to three ejection portions 24 and three ejection portions 34, respectively. For example, one branch pipe 23-1 is connected to three ejection portions 24-1, and one branch pipe 33-1 is connected to three ejection portions 34-1. The ejection portion 24 and the ejection portion 34 may eject the liquid 40 in the direction from the trunk pipe 12 to the side wall 15.

FIG. 3 is an enlarged view of the trunk pipe 12-3 and the branch pipes 13-9 to 13-12 in FIG. As described above, in this example, one end and the other end of the branch pipe 13 are connected to the trunk pipe 12 and the side wall 15. The one end and the other end of the branch pipe 13 are referred to as an end portion E1 and an end portion E2, respectively.

The angle θ formed by one trunk pipe 12 and one branch pipe 13 is greater than 0 degrees and less than 90 degrees. That is, one trunk pipe 12 and one branch pipe 13 do not have to be parallel and do not have to be orthogonal to each other.

FIG. 4 is an enlarged view of the trunk pipe 12-3, the branch pipe 13-12, and the side wall 15-1 in FIG. In FIG. 4, the ejection portions 14-12 are omitted. In the Z-axis direction, the upper end position and the lower end position of the end portion E1 are defined as the position P1 and the position P2, respectively. The position of the midpoint between the position P1 and the position P2 in the Z-axis direction is defined as the position P3. In the Z-axis direction, the upper end position and the lower end position of the end portion E2 are defined as position Q1 and position Q2, respectively. The position of the midpoint between the positions Q1 and the position Q2 in the Z-axis direction is defined as the position Q3. In this example, position Q1, position Q2, and position Q3 are arranged above position P1, position P2, and position P3, respectively.

In the XZ cross section of FIG. 4, the upper end and the lower end of the branch pipe 13-12 are the upper end 25 and the lower end 27, respectively. In FIG. 4, the upper end 25 is a linear end connecting the position P1 and the position Q1, and the lower end 27 is the linear end connecting the position P2 and the position Q2. The central portion of the branch pipe 13-12 in the Z-axis direction is referred to as the central portion 29. In FIG. 4, the central portion 29 is a part of a linear branch pipe 13-12 connecting the position P3 and the position Q3.

The angle at which the trunk pipe 12-3 and the upper end 25 form an acute angle is defined as the angle θ1. The angle at which the trunk pipe 12-3 and the lower end 27 form an acute angle is defined as the angle θ2. The angle at which the trunk pipe 12-3 and the central portion 29 form an acute angle is defined as the angle θ3. The angle θ1, the angle θ2, and the angle θ3 are greater than 0 degrees and less than 90 degrees.

The angle at which the side wall 15-1 and the upper end 25 form an acute angle is defined as the angle θ4. The angle at which the side wall 15-1 and the lower end 27 form an acute angle is defined as the angle θ5. The angle at which the side wall 15-1 and the central portion 29 form an acute angle is defined as the angle θ6. The angle θ4, the angle θ5, and the angle θ6 are greater than 0 degrees and less than 90 degrees.

The angle θ formed by one trunk pipe 12 and one branch pipe 13 may be any of an angle θ1, an angle θ2, and an angle θ3. In other words, any of the angles θ1, the angle θ2, and the angle θ3 may be used as the definition of the angle θ formed by the one trunk pipe 12 and the one branch pipe 13. The angles θ1, the angle θ2, and the angle θ3 may be equal to each other and may be different from each other.

The angle θ1 may be equal to or different from the angle θ4. When the angle θ1 and the angle θ4 are different, the angle θ1 may be larger or smaller than the angle θ4. The case where the angle θ1 is larger than the angle θ4 is the case where at least a part of the upper end 25 has a downwardly convex shape. In this case, at least a part of the upper end 25 may have a downwardly convex curved shape. The case where the angle θ1 is smaller than the angle θ4 is the case where at least a part of the upper end 25 has an upwardly convex shape. In this case, at least a part of the upper end 25 may have an upwardly convex curved shape. Similarly, the angle θ2 may be equal to or different from the angle θ5. Similarly, the angle θ3 may be equal to or different from the angle θ6.

Vessels are susceptible to Z-axis vibrations during voyages depending on ocean conditions. Therefore, when the exhaust gas treatment device 100 is mounted on a ship, the exhaust gas treatment device 100 is susceptible to vibration in the Z-axis direction during the voyage of the ship. When the exhaust gas treatment device 100 receives vibration in the Z-axis direction, the trunk pipe 12 and the branch pipe 13 tend to resonate transiently with the vibration of the exhaust gas treatment device 100. In this example, one end E1 and the other end E2 of the branch pipe 13 are connected to the trunk pipe 12 and the side wall 15, respectively. Therefore, when the trunk pipe 12 and the branch pipe 13 resonate, at least one of the connection between one end E1 of the branch pipe 13 and the trunk pipe 12 and the connection between the other end E2 of the branch pipe 13 and the side wall 15 is damaged. In some cases.

In the exhaust gas treatment device 100 of this example, the angle θ formed by one trunk pipe 12 and one branch pipe 13 connected to the trunk pipe 12 is larger than 0 degrees and less than 90 degrees. Therefore, when the exhaust gas treatment device 100 vibrates, the transient vibration of the trunk pipe 12 and the branch pipe 13 is suppressed as compared with the case where the angle θ formed by the trunk pipe 12 and the branch pipe 13 is 90 degrees. Cheap. Therefore, in the exhaust gas treatment device 100 of this example, the connection between one end E1 of the branch pipe 13 and the trunk pipe 12-3 is compared with the case where the angle θ formed by the trunk pipe 12 and the branch pipe 13 is 90 degrees. , And the connection between the other end E2 of the branch pipe 13 and the side wall 15 is not easily damaged.

Returning to FIG. 3 again, a description will be given. Branch pipe 13 (for example, branch pipe 13-11) connected to the one trunk pipe 12 at the first position in the extension direction (Z-axis direction) of one trunk pipe 12 (main pipe 12-3 in this example). ) Is the first branch pipe 13. A branch pipe 13 connected to the one trunk pipe 12 at a second position different from the first position in the extension direction (Z-axis direction) of one trunk pipe 12 (trunk pipe 12-3 in this example). (For example, branch pipe 13-9) is referred to as a second branch pipe 13. In this example, the first position and the second position are the position of the end E1 to which the trunk pipe 12-3 and the branch pipe 13-11 or the branch pipe 13-12 are connected, and the trunk pipe 12-. It is the position of the end E1 where 3 and the branch pipe 13-9 or the branch pipe 13-10 are connected. The position of the end portion E1 may be any of the position P1, the position P2 and the position P3 in FIG. In this example, the first position is closer to the gas discharge port 17 in the Z-axis direction than the second position.

In the present specification, when the angle formed by the trunk pipe 12 and the branch pipe 13 in the XZ cross section of FIG. 3 forms an acute angle on one side (gas discharge port 17 side) in the extension direction (Z-axis direction) of the trunk pipe 12. Is "upward", and the case where an acute angle is formed on the other side (bottom surface 16 side) is "downward". In this example, the angle θ formed by one trunk pipe 12 (trunk pipe 12-3) and the first branch pipe 13 (branch pipe 13-11) and the one trunk pipe 12 (trunk pipe 12-3). ) And the angle θ formed by the second branch pipe 13 (branch pipe 13-9) is upwardly greater than 0 degrees and less than 90 degrees. Therefore, in the exhaust gas treatment device 100 of this example, when the exhaust gas treatment device 100 vibrates in the Z-axis direction, the branch pipe 13 easily suppresses the vibration of the trunk pipe 12 in the Z-axis direction. Therefore, the exhaust gas treatment device 100 of this example tends to suppress the transient resonance of the trunk pipe 12 and the branch pipe 13 in the Z-axis direction.

FIG. 5 is another enlarged view of the trunk pipe 12-3 and the branch pipes 13-9 to 13-12 in FIG. 1. In this example, the angle θ formed by one trunk pipe 12 (stem pipe 12-3 in this example) and the first branch pipe 13 (for example, branch pipe 13-11) and the one trunk pipe 12 (in this example). The angle θ formed by the trunk pipe 12-3) and the second branch pipe 13 (for example, branch pipe 13-9) is downwardly greater than 0 degrees and less than 90 degrees. This example differs from the example shown in FIG. 3 in this respect. Also in this example, when the exhaust gas treatment device 100 vibrates, it is easy to suppress the transient resonance of the trunk pipe 12 and the branch pipe 13 in the Z-axis direction.

Although not shown in FIGS. 3 and 5, in the example of FIG. 3, the angle θ between the trunk pipe 12-2 and the first branch pipe 13 (for example, branch pipe 13-7) and the trunk pipe 12-2 The angle θ formed by the second branch pipe 13 (for example, branch pipe 13-5) may be larger than 0 degrees and less than 90 degrees upward. In the example of FIG. 5, the angle θ between the trunk pipe 12-2 and the first branch pipe 13 (for example, branch pipe 13-7) and the trunk pipe 12-2 and the second branch pipe 13 (for example, branch pipe 13) The angle θ formed with −5) may be greater than 0 degrees downward and less than 90 degrees. Further, in the example of FIG. 3, the angle θ formed by the trunk pipe 12-1 and the first branch pipe 13 (for example, branch pipe 13-3) and the trunk pipe 12-1 and the second branch pipe 13 (for example, a branch) The angle θ formed with the pipe 13-1) may be larger than 0 degrees and less than 90 degrees upward. In the example of FIG. 5, the angle θ formed by the trunk pipe 12-1 and the first branch pipe 13 (for example, branch pipe 13-3) and the trunk pipe 12-1 and the second branch pipe 13 (for example, branch pipe 13) The angle θ formed by -1) may be greater than 0 degrees downward and less than 90 degrees.

Although not shown in FIGS. 3 and 5, the angle formed by the trunk pipe 12 and the first branch pipe 23 and the angle formed by the trunk pipe 12 and the first branch pipe 33 are the trunk pipe 12 and the first branch pipe 33. It may be the same as the angle formed by the branch pipe 13 of 1. Although not shown in FIGS. 3 and 5, the angle formed by the trunk pipe 12 and the second branch pipe 23 and the angle formed by the trunk pipe 12 and the second branch pipe 33 are the trunk pipe 12 and the second branch pipe 33. It may be the same as the angle formed by the branch pipe 13 of 2.

6A and 6B are diagrams showing an example of the response displacement D of the trunk pipe 12-3 and the trunk pipe 12-2 (not shown in FIG. 3) shown in FIG. 3, respectively. FIG. 6C is a diagram showing an example of a reduction rate of the response displacement D of the trunk pipe 12 shown in FIG. The response displacement D of the trunk pipe 12 refers to the displacement of the end portion E1 with respect to the end portion E2 or the displacement of the end portion E2 with respect to the end portion E1 when the trunk pipe 12 and the branch pipe 13 vibrate transiently.

In FIGS. 6A and 6B, the response displacement D of the trunk tube 12 is placed 2.5 degrees (80.0 degrees, 82.5 degrees, 85.) In the range of an angle θ of 80.0 degrees to 90.0 degrees. 0 degrees, 87.5 degrees and 90.0 degrees). FIG. 6C shows the angle θ dependence of the reduction rate of the response displacement D for the trunk pipe 12-3 and the trunk pipe 12-2, respectively. The reduction rate of the response displacement D is the ratio of the reduction amount of the response displacement D as compared with the response displacement D when the angle θ is 90 degrees.

In this example, the branch pipe 13 resonates at a specific frequency f. This frequency is defined as the resonance frequency fr. The response displacement D shows a maximum value at the resonance frequency fr. This maximum value is defined as the maximum response displacement Dm. In FIG. 6A, the resonance frequency fr and the maximum response displacement Dm are shown only when θ is 90 degrees.

The angle θ formed by one trunk pipe 12 and the branch pipe 13 connected to the trunk pipe 12 may be 80 degrees or more and less than 90 degrees. The angle θ may be 80 degrees or more and 87.5 degrees or less. As shown in FIGS. 6A and 6B, the maximum response displacement Dm when the angle θ is less than 90 degrees is smaller than the maximum response displacement Dm when the angle θ is 90 degrees. When the angle θ is 80 degrees or more and less than 90 degrees, the maximum response displacement Dm becomes smaller as the angle θ becomes smaller. That is, in the range where the angle θ is 80 degrees or more and less than 90 degrees, it is preferable that the angle θ is small in order to reduce the maximum response displacement Dm.

As shown in FIGS. 6A and 6B, the resonance frequency fr when the angle θ is less than 90 degrees is increased as compared with the resonance frequency fr when the angle θ is 90 degrees. When the angle θ is 80 degrees or more and less than 90 degrees, the resonance frequency fr becomes larger as the angle θ becomes smaller. That is, in the range where the angle θ is 80 degrees or more and less than 90 degrees, it is preferable that the angle θ is small in order to increase the resonance frequency fr.

When the exhaust gas treatment device 100 is mounted on a ship, the frequency band assumed as the frequency of vibration in the Z-axis direction received by the exhaust gas treatment device 100 is defined as the band fb. The angle θ may be set so that the resonance frequency fr is larger than the band fb. By setting the angle θ in this way, the branch pipe 13 is less likely to resonate even when the exhaust gas treatment device 100 vibrates in the Z-axis direction.

As can be seen from FIG. 6C, when the angle θ is constant (for example, when the angle θ is 80 degrees), the reduction rate of the response displacement D is higher than that of the lower trunk pipe 12 (trunk pipe 12-2 in this example). However, the upper trunk pipe 12 (trunk pipe 12-3 in this example) is larger than the trunk pipe 12. That is, in order to reduce the response displacement D as compared with the case where the angle θ is 90 degrees, it is preferable that the trunk pipe 12 is provided as upward as possible.

As can be seen from FIGS. 6A and 6B, when the angle θ is constant (for example, when the angle θ is 80 degrees), the resonance frequency fr is the upper trunk tube 12 (stem tube 12-3 in this example) branch pipe. The trunk pipe below the trunk pipe 12 (in this example, the trunk pipe 12-2) shifts to the higher frequency side than the trunk pipe 12. That is, in order to increase the resonance frequency fr as compared with the case where the angle θ is 90 degrees, it is preferable that the trunk pipe 12 is provided as downward as possible.

7A and 7B are diagrams showing an example of the response displacement D of the trunk pipe 12-3 and the trunk pipe 12-2 (not shown in FIG. 5) shown in FIG. 5, respectively. FIG. 7C is a diagram showing an example of a reduction rate of the response displacement D of the trunk pipe 12 shown in FIG. In FIGS. 7A and 7B, the response displacement D of the trunk tube 12 is placed 2.5 degrees (80.0 degrees, 82.5 degrees, 85.) In the range of an angle θ of 80.0 degrees to 90.0 degrees. 0 degrees, 87.5 degrees and 90.0 degrees). FIG. 7C shows the angle θ dependence of the reduction rate of the response displacement D for the trunk pipe 12-3 and the trunk pipe 12-2, respectively. In FIGS. 7A to 7C, the response displacement D and the reduction rate of the response displacement D of the trunk pipe 12 show the same tendency as those in FIGS. 6A to 6C, respectively.

8A and 8B are diagrams showing an example of the reduction rate of the response displacement D of the trunk pipe 12. FIG. 8A is a diagram summarizing the cases of the trunk pipes 12-3 in FIGS. 6C and 7C. FIG. 8B is a diagram summarizing the cases of the trunk pipe 12-2 in FIGS. 6C and 7C.

When comparing the lower trunk pipe 12 (trunk pipe 12-2 in this example) and the upper trunk pipe 12 (trunk pipe 12-3 in this example), the upper trunk pipe 12 (in this example). The reduction rate of the response displacement D of the trunk pipe 12-3) is higher than that in the case of FIG. 5 (the angle formed by the trunk pipe 12 and the branch pipe 13 is a downward angle θ) in the case of FIG. 3 (the trunk pipe 12 and the branch pipe). The angle formed by 13 is larger when the angle θ) is upward. That is, in the case of the upper trunk pipe 12, the reduction rate of the response displacement D is more likely to be increased in the example shown in FIG. 3 than in the example shown in FIG.

The reduction rate of the response displacement D of the lower trunk pipe 12 (trunk pipe 12-2 in this example) is higher than that in the case of FIG. 3 (the angle formed by the trunk pipe 12 and the branch pipe 13 is an upward angle θ). In the case of FIG. 5 (the angle formed by the trunk pipe 12 and the branch pipe 13 is a downward angle θ), it is larger. That is, in the case of the lower trunk pipe 12, the reduction rate of the response displacement D is more likely to be increased in the example shown in FIG. 5 than in the example shown in FIG.

FIG. 9 is another enlarged view of the trunk pipe 12-3 and the branch pipes 13-9 to 13-12 in FIG. 1. In this example, the angle formed by one trunk pipe 12 (trunk pipe 12-3 in this example) and the first branch pipe 13 (for example, branch pipe 13-9 or branch pipe 13-10) is defined as an angle θ'. To do. In this example, the angle formed by one trunk pipe 12 (stem pipe 12-3 in this example) and the second branch pipe 13 (for example, branch pipe 13-11 or branch pipe 13-12) is the above-mentioned angle. θ.

Although not shown in FIG. 9, the angle formed by the trunk pipe 12-3 and the branch pipe 23-9 and the angle formed by the trunk pipe 12-3 and the branch pipe 23-10 are angles θ'. Good. Further, the angle formed by the trunk pipe 12-3 and the branch pipe 33-9 and the angle formed by the trunk pipe 12-3 and the branch pipe 33-10 may be an angle θ'.

This example differs from the example shown in FIG. 3 in that the angle θ'is different from the angle θ. In this example, the angle θ'is larger than the angle θ. The angle θ'is greater than 0 degrees and less than 90 degrees. The angle θ'may be 80 degrees or more and less than 90 degrees, and may be 80 degrees or more and 87.5 degrees or less.

Also in the exhaust gas treatment device 100 of this example, the angle θ formed by one trunk pipe 12 and one branch pipe 13 connected to the trunk pipe 12 is larger than 0 degrees and less than 90 degrees. Therefore, the exhaust gas treatment device 100 of this example also suppresses the transient resonance of the trunk pipe 12 and the branch pipe 13 as compared with the case where the angle θ formed by the trunk pipe 12 and the branch pipe 13 is 90 degrees. Cheap.

FIG. 10 is another enlarged view of the trunk pipe 12-3 and the branch pipes 13-9 to 13-11 in FIG. 1. In this example, one trunk pipe 12 (trunk pipe 12-3 in this example) and the first branch pipe 13 (for example, branch pipe 13-11) form an upward angle θ, and the one trunk pipe is concerned. 12 (trunk pipe 12-3) and the second branch pipe 13 (for example, branch pipe 13-9) form a downward angle θ. This example differs from the example shown in FIG. 3 in this respect. The angle θ is greater than 0 degrees and less than 90 degrees.

FIG. 11 is another enlarged view of the trunk pipe 12-3 and the branch pipes 13-9 to 13-12 in FIG. 1. In this example, one trunk pipe 12 (trunk pipe 12-3 in this example) and the first branch pipe 13 (for example, branch pipe 13-11) form a downward angle θ, and the one trunk pipe is concerned. 12 (trunk pipe 12-3) and the second branch pipe 13 (for example, branch pipe 13-9) form an upward angle θ. This example differs from the example shown in FIG. 10 in this respect. The angle θ is greater than 0 degrees and less than 90 degrees.

Although not shown in FIGS. 10 and 11, in the example of FIG. 10, the trunk pipe 12-3 and the branch pipe 23-9 form a downward angle θ, and in the example of FIG. 11, the trunk pipe 12-3 and the branch pipe are formed. 23-9 forms an angle θ upward. In the example of FIG. 10, the trunk pipe 12-3 and the branch pipe 23-11 form an upward angle θ, and in the example of FIG. 11, the trunk pipe 12-3 and the branch pipe 23-11 form an angle θ downward. The same applies to the angle formed by the trunk pipe 12-3 and the branch pipe 33-9, and the angle formed by the trunk pipe 12-3 and the branch pipe 33-11.

Although not shown in FIGS. 10 and 11, the angle formed by the trunk pipe 12-2 and the first branch pipe 13 to the first branch pipe 33 is the trunk pipe 12-3 and the first branch pipe 13 to 13. It may be the same as the angle formed by the first branch pipe 33. The angle formed by the trunk pipe 12-2 and the second branch pipe 13 to the second branch pipe 33 is the same as the angle formed by the trunk pipe 12-3 and the second branch pipe 13 to the second branch pipe 33. May be.

Although not shown in FIGS. 10 and 11, the angle formed by the trunk pipe 12-1 and the first branch pipe 13 to the first branch pipe 33 is the trunk pipe 12-3 and the first branch pipe 13 to 13. It may be the same as the angle formed by the first branch pipe 33. The angle formed by the trunk pipe 12-1 and the second branch pipe 13 to the second branch pipe 33 is the same as the angle formed by the trunk pipe 12-3 and the second branch pipe 13 to the second branch pipe 33. May be.

Also in the exhaust gas treatment device 100 shown in FIGS. 10 and 11, the angle θ formed by one trunk pipe 12 and one branch pipe 13 connected to the trunk pipe 12 is larger than 0 degrees and less than 90 degrees. .. Therefore, the exhaust gas treatment device 100 shown in FIGS. 10 and 11 is also transient in the trunk pipe 12 and the branch pipe 13 as compared with the case where the angle θ formed by the trunk pipe 12 and the branch pipe 13 is 90 degrees. It is easy to suppress the resonance.

12A and 12B are diagrams showing an example of the response displacement D of the trunk pipe 12-3 and the trunk pipe 12-2 (not shown in FIG. 10) shown in FIG. 10, respectively. FIG. 12C is a diagram showing an example of a reduction rate of the response displacement D of the trunk pipe 12 shown in FIG. In FIGS. 12A and 12B, the response displacement D of the trunk tube 12 is placed 2.5 degrees (80.0 degrees, 82.5 degrees, 85.) In the range of an angle θ of 80.0 degrees to 90.0 degrees. 0 degrees, 87.5 degrees and 90.0 degrees). FIG. 12C shows the angle θ dependence of the reduction rate of the response displacement D for the trunk pipe 12-3 and the trunk pipe 12-2, respectively.

Similar to the examples of FIGS. 6A and 6B, the maximum response displacement Dm when the angle θ is less than 90 degrees is smaller than the maximum response displacement Dm when the angle θ is 90 degrees. When the angle θ is 80 degrees or more and less than 90 degrees, the maximum response displacement Dm becomes smaller as the angle θ becomes smaller. That is, in the range where the angle θ is 80 degrees or more and less than 90 degrees, it is preferable that the angle θ is small in order to reduce the maximum response displacement Dm.

Similar to the examples of FIGS. 6A and 6B, the resonance frequency fr when the angle θ is less than 90 degrees is increased as compared with the resonance frequency fr when the angle θ is 90 degrees. When the angle θ is 80 degrees or more and less than 90 degrees, the resonance frequency fr becomes larger as the angle θ becomes smaller. That is, in the range where the angle θ is 80 degrees or more and less than 90 degrees, it is preferable that the angle θ is small in order to increase the resonance frequency fr.

As can be seen from FIG. 12C, when the angle θ is constant (for example, when the angle θ is 80 degrees), the reduction rate of the response displacement D is higher than that of the upper trunk pipe 12 (trunk pipe 12-3 in this example). , The lower trunk pipe 12 is larger than the trunk pipe 12. That is, in order to reduce the response displacement D as compared with the case where the angle θ is 90 degrees, it is preferable that the trunk pipe 12 is provided as downward as possible.

As can be seen from FIGS. 12A and 12B, when the angle θ is constant (for example, when the angle θ is 80 degrees), the resonance frequency fr is higher than that of the upper trunk tube 12 (stem tube 12-3 in this example). , The lower trunk pipe (trunk pipe 12-2 in this example) shifts to the higher frequency side than the trunk pipe 12. That is, in order to increase the resonance frequency fr as compared with the case where the angle θ is 90 degrees, it is preferable that the trunk pipe 12 is provided as downward as possible.

13A and 13B are diagrams showing an example of the response displacement D of the trunk pipe 12-3 and the trunk pipe 12-2 (not shown in FIG. 11) shown in FIG. 11, respectively. FIG. 13C is a diagram showing an example of a reduction rate of the response displacement D of the trunk pipe 12 shown in FIG. In FIGS. 13A and 13B, the response displacement D of the trunk tube 12 is placed 2.5 degrees (80.0 degrees, 82.5 degrees, 85.0 degrees, 87) in the range of angles θ of 80 to 90 degrees. It is shown in (5.5 degrees and 90.0 degrees). FIG. 13C shows the angle θ dependence of the reduction rate of the response displacement D for the trunk pipe 12-3 and the trunk pipe 12-2, respectively. In FIGS. 13A and 13B, the response displacement D and the reduction rate of the response displacement D of the trunk pipe 12 show the same tendency as those in FIGS. 12A and 12B, respectively.

As can be seen from FIG. 13C, when the angle θ is constant (for example, when the angle θ is 80 degrees), the reduction rate of the response displacement D is higher than that of the lower trunk pipe 12 (trunk pipe 12-2 in this example). However, the upper trunk pipe 12 (trunk pipe 12-3 in this example) is larger than the trunk pipe 12. That is, in order to reduce the response displacement D as compared with the case where the angle θ is 90 degrees, it is preferable that the trunk pipe 12 is provided as upward as possible.

14 and 15 are views showing another example in the top view of the exhaust gas treatment device 100 shown in FIG. 1, respectively. The reaction column 10 of this example is columnar. FIG. 14 shows an example of the branch pipes 13-11 and the branch pipes 13-12 in FIG. 1 in a top view. FIG. 15 shows an example of the branch pipes 13-9 and the branch pipes 13-10 in FIG. 1 in a top view. In FIG. 15, the branch pipes 13-11 and the branch pipes 13-12 provided above the branch pipes 13-9 and the branch pipes 13-10 are omitted.

The branch pipe 13, the branch pipe 23, and the branch pipe 33 may form an angle θ with the trunk pipe 12 as shown in any of FIGS. 3, 5 and 9 to 11 in the XZ cross section. The branch pipe 13, the branch pipe 23, and the branch pipe 33 may be orthogonal to the trunk pipe 12 in the XZ cross section.

The dashed lines of the AA', BB'and CC'lines in FIGS. 14 and 15 are equivalent to those shown in FIG. In top view, the direction from the center Ce of the trunk pipe 12 to the end E2 of the first branch pipe 13 is a direction parallel to the AA'line. The direction from the center Ce of the trunk pipe 12 to the end E2 of the first branch pipe 23 is a direction parallel to the BB'line. The direction from the center Ce of the trunk pipe 12 to the end E2 of the first branch pipe 33 is a direction parallel to the CC'line.

In this example, the branch pipe 13, the branch pipe 23, and the branch pipe 33 in FIG. 14 are referred to as the first branch pipe 13, the first branch pipe 23, and the first branch pipe 33, respectively. In this example, the branch pipe 13, the branch pipe 23, and the branch pipe 33 in FIG. 15 are referred to as the second branch pipe 13, the second branch pipe 23, and the second branch pipe 33, respectively.

In this example, the first branch pipe 13-11 and the first branch pipe 13-12 extend from the trunk pipe 12-3 in the direction of the alternate long and short dash line indicated by Ea and Ea', respectively. In this example, the first branch pipe 23-11 and the first branch pipe 23-12 extend from the trunk pipe 12-3 in the direction of the alternate long and short dash line indicated by Eb and Eb', respectively. In this example, the first branch pipe 33-11 and the first branch pipe 33-12 extend from the trunk pipe 12-3 in the direction of the one-point chain line indicated by Ec and Ec', respectively.

In this example, the second branch pipe 13-9 and the second branch pipe 13-10 extend from the trunk pipe 12-3 in the direction of the alternate long and short dash line indicated by Fa and Fa', respectively. In this example, the second branch pipe 23-9 and the second branch pipe 23-10 extend from the trunk pipe 12-3 in the direction of the alternate long and short dash line indicated by Fb and Fb', respectively. In this example, the second branch pipe 33-9 and the second branch pipe 33-10 extend from the trunk pipe 12 in the direction of the alternate long and short dash line indicated by Fc and Fc', respectively.

The direction from one trunk pipe 12 (trunk pipe 12-3) to the end E2 of the first branch pipe 13 (branch pipe 13-11 or branch pipe 13-12) and the extension direction of the first branch pipe 13. The angle formed by (the direction of Ea or Ea') is defined as the angle φ. In this example, the angle φ is greater than 0 degrees and less than 90 degrees on one side in the plane (in the XY plane) orthogonal to the extension direction (Z-axis direction) of one trunk pipe 12 (trunk pipe 12-3). .. The one side in the plane means that the direction from the broken line of the AA'line to the alternate long and short dash line indicated by Ea or Ea' is clockwise in the top view outside the reaction tower 10. In FIG. 14, this direction is indicated by a thick arrow.

In this example, the direction from one trunk pipe 12 to the end E2 of the first branch pipe 23 (branch pipe 23-11 or branch pipe 23-12) and the extension direction of the first branch pipe 23 (Eb or The angle formed with (the direction of Eb') is equal to the angle φ. In this example, the direction from one trunk pipe 12 to the end E2 of the first branch pipe 33 (branch pipe 33-11 or branch pipe 33-12) and the extension direction of the first branch pipe 33 (Ec or The angle formed with (the direction of Ec') is equal to the angle φ.

The direction from one trunk pipe 12 (trunk pipe 12-3) to the end E2 of the second branch pipe 13 (branch pipe 13-9 or branch pipe 13-10) and the extension direction of the second branch pipe 13. The angle formed by (the direction of Ea or Ea') is defined as the angle φ'. In this example, the angle φ'is greater than 0 degrees and less than 90 degrees on the other side in the plane (in the XY plane) orthogonal to the extension direction (Z-axis direction) of one trunk pipe 12 (trunk pipe 12-3). is there. The other side in the plane means that the direction from the broken line of the AA'line to the alternate long and short dash line indicated by Ea or Ea' is counterclockwise in the top view outside the reaction tower 10. In FIG. 15, this direction is indicated by a thick arrow.

In this example, the direction from one trunk pipe 12 to the end E2 of the first branch pipe 23 (branch pipe 23-9 or branch pipe 23-10) and the extension direction of the first branch pipe 23 (Eb or The angle formed with (the direction of Eb') is equal to the angle φ'. In this example, the direction from one trunk pipe 12 to the end E2 of the first branch pipe 33 (branch pipe 33-9 or branch pipe 33-10) and the extension direction of the first branch pipe 33 (Ec or The angle formed with (the direction of Ec') is equal to the angle φ'.

In other words, in this example, one trunk pipe 12 has two branch pipes 13 (branch pipes 13-11 and branch pipes 13) whose rotation angles are opposite to the AA'line in the XY plane. -9) are connected to different positions in the Z-axis direction. The two branch pipes 23 and the two branch pipes 33 are also connected to the one trunk pipe 12 in the same manner. The angle φ'may be equal to or different from the angle φ.

When the trunk pipe 12 vibrates in the Z-axis direction in the examples of FIGS. 14 and 15, the first branch pipe 13, the first branch pipe 23, and the first branch pipe 33 are on one side (clock) in the XY plane. A rotational force is likely to be generated on the other side (counterclockwise) of the second branch pipe 13, the second branch pipe 23, and the second branch pipe 33 in the XY plane. The directions of the rotational forces in the examples of FIGS. 14 and 15 are the rotational force Fr and the rotational force Fr', respectively.

In this example, the direction of the rotational force Fr shown in FIG. 14 and the direction of the rotational force Fr'shown in FIG. 15 are opposite in the XY plane. Therefore, the rotational force Fr and the rotational force Fr'are likely to cancel each other out. Therefore, in the exhaust gas treatment device 100 of this example, even when the trunk pipe 12 vibrates in the Z-axis direction, the connection between one end of the branch pipe 13 and the trunk pipe 12 and the other end of the branch pipe 13 It is easy to suppress damage to the connection with the side wall 15.

FIG. 16 is a diagram showing a form of connection between the trunk pipe 12 and the branch pipe 13 and the like. The branch pipe 13 and the like refer to the branch pipe 13, the branch pipe 23, and the branch pipe 33. FIG. 16 summarizes the forms of the connection between the trunk pipe 12 and the branch pipe 13 and the like in top view and side view. The side view is a case where the reaction tower 10 is viewed from a direction parallel to the XY plane.

The reference form 1 is a form in which the extending direction of the branch pipe 13 or the like coincides with the AA'line, the BB' line, and the CC'line in the top view (the form of FIG. 2). In other words, the reference form 1 is a form in which the branch pipe 13 and the like extend from the central Ce of the trunk pipe 12. The twisted form is a form in which the extending direction of the branch pipe 13 does not coincide with the AA'line, the BB' line, and the CC'line in the top view (the form shown in FIGS. 14 and 15). In other words, the twisted form is a form in which the branch pipe 13 and the like extend out of the center Ce of the trunk pipe 12.

The reference form 2 is a form in which the trunk pipe 12 and the branch pipe 13 and the like are orthogonal to each other in a side view. The inclined form 1 is a first form in which the trunk pipe 12 and the branch pipe 13 and the like form an angle θ in the Z-axis direction in a side view, and is the form shown in FIG. The inclined form 2 is a second form in which the trunk pipe 12 and the branch pipe 13 and the like form an angle θ in the Z-axis direction in a side view, and is the form shown in FIG.

In this example, the form in which the top view is the reference form 1 and the side view is the reference form 2 is referred to as a comparative form. In this example, the form in which the top view is a twisted form and the side view is a reference form 2 is referred to as an embodiment 1. In this example, the form in which the top view is a twisted form and the side view is an inclined form 1 is referred to as a second embodiment. In this example, the form in which the top view is a twisted form and the side view is an inclined form 2 is referred to as a third embodiment. The case of θ = 90.0 degrees in FIGS. 6A, 6B, 7A, 7B, 12A, 12B, 13A and 13B is equivalent to the comparative form in this example.

17A and 17B are diagrams showing an example of the response displacement of the trunk pipe 12 in the cases of the comparative embodiment and the first to third embodiments. 17A and 17B are the response displacements D of the trunk pipe 12-3 and the trunk pipe 12-2, respectively. In FIGS. 17A and 17B, the response displacement D in the case of the comparative embodiment, the first embodiment, the second embodiment and the third embodiment is shown by a solid line, a one-dot chain line, a coarse broken line and a two-dot chain line, respectively.

The response displacement D in the case of the first embodiment (dashed line) is smaller than the response displacement D in the case of the comparative embodiment (solid line). When the top view is in a twisted form, the rotational force Fr and the rotational force Fr'are likely to cancel each other out as described above. Therefore, the response displacement D of the first embodiment is more likely to be reduced than the response displacement D of the comparative embodiment.

The response displacement D in the case of the second embodiment (coarse broken line) and the third embodiment (dashed line) is further reduced than the response displacement D in the case of the first embodiment (dashed line). When the side view is the inclined form 1 or the inclined form 2, the branch pipe 13 or the like tends to suppress the vibration of the trunk pipe 12 in the Z-axis direction. Therefore, the response displacement D in the case of the second embodiment and the third embodiment is more likely to be reduced than the response displacement D in the case of the first embodiment.

As can be seen by comparing FIGS. 17A and 17B, in all of the first to third embodiments, the resonance frequency fr is higher than that of the upper trunk pipe 12 (trunk pipe 12-3 in this example). The lower trunk pipe (trunk pipe 12-2 in this example) shifts to the higher frequency side. In order to increase the resonance frequency fr, it is preferable that the trunk tube 12 is provided as downward as possible.

FIG. 18 is an enlarged view of the trunk pipe 12-2 and the branch pipe 13-5 to the branch pipe 13-8, and the trunk pipe 12-3 and the branch pipe 13-9 to the branch pipe 13-12 in FIG. In the extension direction (Z-axis direction) of the trunk pipe 12, the trunk pipe 12-3 is provided on the discharge side of the exhaust gas 30 with respect to the trunk pipe 12-2. In this example, the trunk pipes 12-3 and the trunk pipes 12-2 are referred to as the first trunk pipe 12 and the second trunk pipe 12, respectively. In the direction (direction in the XY plane) orthogonal to the extension direction (Z-axis direction) of the trunk pipe 12, the cross-sectional area of the first trunk pipe 12 (trunk pipe 12-3) is the second trunk pipe 12 (trunk). It may be smaller than the cross-sectional area of the pipe 12-2).

In this example, the branch pipe 13 connected to the first trunk pipe 12 (trunk pipe 12-3) and the branch pipe 13 connected to the second trunk pipe 12 (trunk pipe 12-2) are each first. The branch pipe 13 and the second branch pipe 13 of the above. The angle θ between the first trunk pipe 12 (stem pipe 12-3) and the first branch pipe 13 (for example, branch pipe 13-9), and the second trunk pipe 12 (stem pipe 12-2) and the second The angle θ formed by the branch pipe 13 (for example, branch pipe 13-5) of 2 may be different or equal.

The angle θ formed by the first trunk pipe 12 (trunk pipe 12-3) and the first branch pipe 13 (for example, branch pipe 13-9) may be larger than 0 degrees and less than 90 degrees upward. The angle θ formed by the second trunk pipe 12 (trunk pipe 12-2) and the second branch pipe 13 (for example, branch pipe 13-5) may be more than 0 degrees downward and less than 90 degrees.

Although not shown in FIG. 18, the angle formed by the trunk pipe 12-3 and the branch pipe 23 and the angle formed by the trunk pipe 12-3 and the branch pipe 33 are upwardly greater than 0 degrees and less than 90 degrees. It may be there. Further, the angle formed by the trunk pipe 12-2 and the branch pipe 23 and the angle formed by the trunk pipe 12-2 and the branch pipe 33 may be more than 0 degrees downward and less than 90 degrees.

Also in the exhaust gas treatment device 100 of this example, the angle θ formed by one trunk pipe 12 and one branch pipe 13 connected to the trunk pipe 12 is larger than 0 degrees and less than 90 degrees. Therefore, when the exhaust gas treatment device 100 vibrates, the transient resonance of the trunk pipe 12 and the branch pipe 13 is suppressed as compared with the case where the angle θ formed by the trunk pipe 12 and the branch pipe 13 is 90 degrees. Cheap. The first trunk pipe 12 (trunk pipe 12-3) and the first branch pipe 13 (for example, branch pipe 13-9) form a downward angle θ, and the second trunk pipe 12 (trunk pipe 12) 12-2) and the second branch pipe 13 (for example, branch pipe 13-5) may form an upward angle θ.

FIG. 19 is another enlarged view of the trunk pipe 12-2 and the branch pipe 13-5 to the branch pipe 13-8 in FIG. 1, and the trunk pipe 12-3 and the branch pipe 13-9 to the branch pipe 13-12. .. In this example, the angle θ formed by the second trunk pipe 12 (trunk pipe 12-2) and the second branch pipe 13 (for example, branch pipe 13-5) is the first trunk pipe 12 (trunk pipe 12). It is smaller than the angle θ'between -3) and the first branch pipe 13 (for example, branch pipe 13-9). This example differs from the example shown in FIG. 18 in this respect.

As described above, in this example, the cross-sectional area of the first trunk pipe 12 (trunk pipe 12-3) in the XY plane is a break in the XY plane of the second trunk pipe 12 (stem pipe 12-2). Smaller than the area. Therefore, when the reaction tower 10 vibrates in the Z-axis direction, the transient vibration of the second trunk pipe 12 (trunk pipe 12-2) and the second branch pipe 13 in the Z-axis direction causes the first trunk. It tends to be larger than the transient vibration of the pipe 12 (trunk pipe 12-3) and the first branch pipe 13 in the Z-axis direction. In this example, a large vibration means that the amplitude of the vibration is large.

In this example, since the angle θ is smaller than the angle θ', the second branch pipe 13 (branch pipe 13-5 to 13-8) is the first branch pipe 13 (branch pipe 13-9 to branch pipe). It is easier to suppress the transient vibration of the trunk pipe 12 in the Z-axis direction than 13-12). Therefore, when the cross-sectional area of the second trunk pipe 12 (stem pipe 12-2) in the XY plane is larger than the cross-sectional area of the first trunk pipe 12 (stem pipe 12-3) in the XY plane. Even if there is, the second branch pipe 13 (branch pipe 13-5 to branch pipe 13-8) can easily suppress the vibration of the second trunk pipe 12 (stem pipe 12-2).

FIG. 20 is a diagram showing another example in the top view of the exhaust gas treatment device 100 shown in FIG. The reaction tower 10 of this example has a hexagonal columnar shape and has a hexagonal shape when viewed from above. Also in this example, the power device 50, the pump 60, the liquid introduction pipe 19, the exhaust gas introduction pipe 32, the flow rate control unit 70, and the gas discharge port 17 are omitted.

A trunk tube 12 is provided inside the reaction tower 10. The central position of the reaction column 10 is defined as the central Ce. In this example, the center Ce is a point in the XY plane where the positions from the six vertices are equal. The central position of the trunk pipe 12 may be the central Ce. The reaction column 10 of this example has a hexagonal columnar shape having the central Ce as the central axis and extending in the Z-axis direction. The trunk tube 12 of this example is a columnar shape having a central Ce as a central axis and extending in the Z-axis direction.

21A and 21B are diagrams showing an example of the response displacement D of the trunk pipe 12-3 and the trunk pipe 12-2 (not shown in FIG. 20) shown in FIG. 20, respectively. In FIGS. 21A and 21B, the response displacement D in the case of the comparative form (solid line) shown in FIGS. 17A and 17B, respectively, is also shown. In this example, the embodiment in which the reaction tower 10 has a hexagonal shape when viewed from above (in the case of FIG. 20) is referred to as the fourth embodiment. In FIGS. 21A and 21B, the response displacement D in the case of the fourth embodiment is shown by the alternate long and short dash line.

The response displacement D in the case of the fourth embodiment (dashed line) is smaller than the response displacement D in the case of the comparative embodiment (solid line). In this example, the end portion E2 (see FIG. 3) of the branch pipe 13 is located at a position where the reaction tower 10 has a hexagonal shape in a top view and two adjacent planar side walls 15 intersect in a top view. Since they are connected, the rigidity of the side wall 15 tends to be higher than when the end E2 is connected to the curved side wall 15. Therefore, the response displacement D in the case of the fourth embodiment is more likely to be reduced than the response displacement D in the case of the comparative embodiment.

As can be seen by comparing FIG. 21A and FIG. 21B, in the fourth embodiment, the resonance frequency fr is the same as in the examples shown in FIGS. 17A and 17B, and the upper trunk tube 12 (in this example, the trunk tube 12-). The trunk pipe below the trunk pipe 12 (in this example, the trunk pipe 12-2) shifts to the higher frequency side than 3).

FIG. 22 is an enlarged view of the trunk pipe 12-1 and the branch pipe 13-1 to the branch pipe 13-4, and the trunk pipe 12-2 and the branch pipe 13-5 to the branch pipe 13-8 in FIG. In the extension direction (Z-axis direction) of the trunk pipe 12, the trunk pipe 12-2 is provided on the discharge side of the exhaust gas 30 with respect to the trunk pipe 12-1. In this example, the trunk pipe 12-2 and the trunk pipe 12-1 are referred to as the first trunk pipe 12 and the second trunk pipe 12, respectively. In this example, the second trunk pipe 12 (trunk pipe 12-1) is provided on the introduction side of the exhaust gas 30 most in the extension direction (Z-axis direction) of the trunk pipe 12. In the direction (direction in the XY plane) orthogonal to the extension direction (Z-axis direction) of the trunk pipe 12, the cross-sectional area of the first trunk pipe 12 (trunk pipe 12-2) is the second trunk pipe 12 (trunk). It may be smaller than the cross-sectional area of the pipe 12-1).

The exhaust gas treatment device 100 of this example further includes a connection portion 80. In this example, the second trunk tube 12 (stem tube 12-1) is connected to the bottom surface 16 of the reaction tower 10. The connecting portion 80 may connect the bottom surface of the liquid introduction pipe 19-1 to the bottom surface 16. In this example, the second trunk pipe 12 (trunk pipe 12-1) is connected to the bottom surface 16 by the connecting portion 80. The connecting portion 80 may be made of the same material as the trunk pipe 12.

In this example, the branch pipe 13 connected to the first trunk pipe 12 (trunk pipe 12-2) and the branch pipe 13 connected to the second trunk pipe 12 (trunk pipe 12-1) are each first. The branch pipe 13 and the second branch pipe 13 of the above. The angle θ'between the second trunk pipe 12 (trunk pipe 12-1) and the second branch pipe 13 (for example, branch pipe 13-1) is the same as that of the first trunk pipe 12 (trunk pipe 12-2). It may be larger than the angle θ formed by the first branch pipe 13 (for example, branch pipe 13-5). The angle θ and the angle θ'may be greater than 0 degrees and less than 90 degrees, may be 80 degrees or more and less than 90 degrees, and may be 80 degrees or more and 87.5 degrees or less.

In this example, since the second trunk pipe 12 (trunk pipe 12-1) is connected to the bottom surface 16 of the reaction tower 10, even when the exhaust gas treatment device 100 vibrates in the Z-axis direction, the second trunk pipe 12 (trunk pipe 12-1) is connected to the bottom surface 16. The trunk pipe 12 of No. 2 is unlikely to vibrate transiently. In other words, in this example, the second trunk pipe 12 tends to vibrate in synchronization with the vibration of the exhaust gas treatment device 100. Therefore, the angle θ'may be smaller than the angle θ.

The first trunk pipe 12 (trunk pipe 12-2) and the first branch pipe 13 (for example, branch pipe 13-5) may form an angle θ upward or downward. In this example, the first trunk pipe 12 and the first branch pipe 13 form an upward angle θ. The second trunk pipe 12 (trunk pipe 12-1) and the second branch pipe 13 (for example, branch pipe 13-1) may form an angle θ'upward or downward. In this example, the second trunk pipe 12 and the second branch pipe 13 form an upward angle θ'.

Although not shown in FIG. 22, the trunk pipe 12-2 and the branch pipe 23 may have an upward angle θ, and the trunk pipe 12-2 and the branch pipe 33 may have an upward angle θ. Further, the trunk pipe 12-1 and the branch pipe 23 may have an upward angle θ', and the trunk pipe 12-1 and the branch pipe 33 may have an upward angle θ'.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. It is clear from the description of the claims that such modified or improved forms may also be included in the technical scope of the present invention.

The order of execution of operations, procedures, steps, steps, etc. in the devices, systems, programs, and methods shown in the claims, specification, and drawings is particularly "before" and "prior to". It should be noted that it can be realized in any order unless the output of the previous process is used in the subsequent process. Even if the scope of claims, the specification, and the operation flow in the drawings are explained using "first", "next", etc. for convenience, it means that it is essential to carry out in this order. It's not a thing.

10 ... reaction tower, 11 ... gas introduction opening, 12 ... trunk pipe, 13 ... branch pipe, 14 ... ejection part, 15 ... side wall, 16 ... bottom surface, 17 ...・ ・ Gas outlet, 18 ・ ・ ・ gas treatment part, 19 ・ ・ ・ liquid introduction pipe, 20 ・ ・ ・ exhaust pipe, 23 ・ ・ ・ branch pipe, 24 ・ ・ ・ ejection part, 25 ・ ・ ・ upper end, 27 ... lower end, 29 ... central part, 30 ... exhaust gas, 32 ... exhaust gas introduction pipe, 33 ... branch pipe, 34 ... ejection part, 40 ... liquid, 46 ... Drainage, 50 ... power unit, 60 ... pump, 70 ... flow control unit, 72 ... valve, 80 ... connection part, 100 ... exhaust gas treatment device

Claims (11)

A reaction tower in which exhaust gas is introduced and a liquid for treating the exhaust gas is supplied.
One or more trunk tubes provided inside the reaction tower, to which the liquid is supplied and which extends in the direction from the introduction side to the discharge side of the exhaust gas.
With one or more branch tubes provided inside the reaction tower, one end of which is connected to the trunk tube, which extends in a predetermined direction and is supplied with the liquid.
With
The angle between one trunk tube and one branch tube is greater than 0 degrees and less than 90 degrees.
Exhaust gas treatment equipment. The exhaust gas treatment apparatus according to claim 1, wherein the angle formed by the one trunk pipe and the one branch pipe is 80 degrees or more and less than 90 degrees. The exhaust gas treatment apparatus according to claim 1 or 2, wherein the angle formed by the one trunk pipe and the one branch pipe is 80 degrees or more and 87.5 degrees or less. The exhaust gas treatment apparatus according to any one of claims 1 to 3, wherein the other end of the branch pipe is connected to the side wall of the reaction tower. The first branch pipe of the plurality of branch pipes is connected to the one trunk pipe.
The second branch of the plurality of branch pipes is connected to the one trunk pipe.
Any one of claims 1 to 4, wherein the angle formed by the one trunk pipe and the first branch pipe is different from the angle formed by the one trunk pipe and the second branch pipe. Exhaust gas treatment device according to. The first branch pipe is connected to the one trunk pipe at a first position in the extending direction of the one trunk pipe.
The second branch pipe is connected to the one trunk pipe at a second position different from the first position in the extending direction of the one trunk pipe.
The angle formed by the one trunk pipe and the first branch pipe is greater than 0 degrees and less than 90 degrees on one side in the extending direction of the one trunk pipe.
The angle formed by the one trunk pipe and the second branch pipe is greater than 0 degrees and less than 90 degrees on the other side in the extending direction of the one trunk pipe.
The exhaust gas treatment device according to claim 5. In a plane orthogonal to the extending direction of the one trunk tube
The angle formed by the direction from the one trunk pipe to the other end of the first branch pipe and the extension direction of the first branch pipe is greater than 0 degrees on one side in the orthogonal plane 90. Less than a degree
The angle formed by the direction from the one trunk pipe to the other end of the second branch pipe and the extension direction of the second branch pipe is greater than 0 degrees to the other side in the orthogonal plane 90. Less than a degree,
The exhaust gas treatment device according to claim 5 or 6. The first trunk pipe of the plurality of trunk pipes is provided on the exhaust gas discharge side of the second trunk pipe of the plurality of trunk pipes in the extension direction of the trunk pipe.
The first trunk pipe is connected to the first branch pipe of the plurality of branch pipes.
The second trunk pipe is connected to the second branch pipe of the plurality of branch pipes.
The angle formed by the first trunk pipe and the first branch pipe is different from the angle formed by the second trunk pipe and the second branch pipe.
The exhaust gas treatment device according to any one of claims 1 to 4. The angle formed by the first trunk pipe and the first branch pipe is greater than 0 degrees and less than 90 degrees on one side in the extending direction of the trunk pipe.
The angle formed by the second trunk pipe and the second branch pipe is greater than 0 degrees and less than 90 degrees on the other side in the extending direction of the trunk pipe.
The exhaust gas treatment device according to claim 8. In the direction orthogonal to the extending direction of the trunk pipe, the cross-sectional area of the first trunk pipe is smaller than the cross-sectional area of the second trunk pipe.
The angle formed by the second trunk pipe and the second branch pipe is smaller than the angle formed by the first trunk pipe and the first branch pipe.
The exhaust gas treatment device according to claim 8 or 9. The second trunk pipe is further provided with a connecting portion which is provided on the introduction side of the exhaust gas most in the extending direction of the trunk pipe and is connected to the bottom surface of the reaction tower.
The angle formed by the second trunk pipe and the second branch pipe is larger than the angle formed by the first trunk pipe and the first branch pipe.
The exhaust gas treatment device according to claim 8 or 9.

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