JP2023000649A - Exhaust gas processing device - Google Patents

Abstract

To provide an exhaust gas processing device which inhibits resonance of branch pipes provided at the exhaust gas processing device even if the exhaust gas processing device vibrates.SOLUTION: An exhaust gas processing device includes: a reactor into which an exhaust gas is introduced and liquid for processing the exhaust gas is supplied; a trunk pipe 12-3 which is provided within the reactor and supplied with the liquid and extends in a direction from the exhaust gas introduction side to the discharge side; and one or multiple branch pipes 13-11 which are provided within the reactor and supplied with the liquid and extend in a direction intersecting with the direction from the exhaust gas introduction side to the discharge side. A shape of the trunk pipe when viewed in the direction from the exhaust gas discharge side to the introduction side has: a first portion 91 having a first curvature; and a second portion 92 having a second curvature larger than a curvature of the first portion. One end E1 of the branch pipe is connected to the second portion of the trunk pipe when viewed in the direction from the exhaust gas discharge side to the introduction side.SELECTED DRAWING: Figure 3

Description

The present invention relates to an exhaust gas treatment device.

Patent Literature 1 describes that "each of the plurality of first connecting portions 83 is provided with a first beam 86 toward the central axis of the absorbing tube 11" (paragraph 0071).
Patent Document 2 describes, "A vehicle propulsion shaft according to a first invention is characterized by comprising a plurality of leg portions radially extending radially outward from an outer peripheral surface of a cylindrical portion, and . . . Do." (Paragraph 0007).
Patent Literature 3 states that "a nozzle body is composed of a square tubular outer tube and a square tubular inner tube whose both ends are closed with lid plates" (abstract).
[Prior art documents]
[Patent Literature]
[Patent Document 1] JP-A-2017-56385 [Patent Document 2] JP-A-2019-127965 [Patent Document 3] JP-A-2006-198581

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

A first aspect of the present invention provides an exhaust gas treatment apparatus. The exhaust gas treatment apparatus includes a reaction tower into which exhaust gas is introduced and supplied with a liquid for treating the exhaust gas, and a trunk provided inside the reaction tower to which the liquid is supplied and which extends in the direction from the exhaust gas introduction side to the discharge side. and one or more branch pipes provided inside the reaction tower, supplied with liquid, and extending in a direction crossing the direction from the exhaust gas introduction side to the discharge side. The shape of the main pipe when viewed in the direction from the exhaust gas discharge side to the exhaust gas introduction side has a first portion with a first curvature and a second portion with a second curvature larger than the first portion. One end of the branch pipe is connected to the second portion of the main pipe when viewed in the direction from the exhaust gas discharge side to the exhaust gas introduction side.

One end of the branch pipe may be connected to the second portion and the first portion of the main pipe when viewed in the direction from the exhaust gas discharge side to the exhaust gas introduction side.

When viewed in the direction from the exhaust gas discharge side to the exhaust gas introduction side, one end of the branch pipe is connected to the first corner that is the first corner of the trunk pipe and includes the second portion and the first portion. good.

The main pipe may have a plurality of first corners when viewed in the direction from the exhaust gas discharge side to the exhaust gas introduction side. Each of the multiple branch pipes may be connected to each of the multiple first corners of the trunk pipe.

When viewed in the direction from the exhaust gas discharge side to the introduction side, the trunk pipe may have a polygonal shape.

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

The reaction tower may have an internal space through which the exhaust gas passes. The shape of the internal space when viewed in the direction from the exhaust gas discharge side to the exhaust gas introduction side may have a plurality of second corners.

The number of first corners may be equal to the number of second corners.

The number of first corners and the number of second corners may be different.

The number of the plurality of second corners may be greater than the number of the plurality of first corners.

The other end of each of the plurality of branch pipes may be connected to each of the plurality of second corners on the side wall of the reaction column.

In the cross section of the branch pipe in the direction intersecting with the extending direction of the branch pipe, the width of the cross section in the direction from the introduction side of the exhaust gas to the discharge side is the width of the cross section in the direction intersecting with the direction from the introduction side of the exhaust gas to the discharge side. may be larger than

A cross section of the branch pipe in a direction intersecting with the extending direction of the branch pipe may be elliptical.

The angle formed between the branch pipe connected to the second portion of the trunk pipe and the trunk pipe, wherein the angle formed by the branch pipe and the trunk pipe in the direction intersecting the extending direction of the trunk pipe is greater than 0 degrees and 90 degrees. may be less than

The exhaust gas treatment device may have a plurality of main pipes. When viewed in the direction from the exhaust gas discharge side to the exhaust gas introduction side, the shape of one main pipe in the plurality of main pipes may be different from the shape of the other main pipes.

It should be noted that the above summary of the invention does not list all the features of the invention. Subcombinations of these feature groups can also be inventions.

It is a figure showing an example of exhaust gas treatment equipment 100 concerning one embodiment of the present invention. It is a figure which shows an example in the top view of the waste gas treatment apparatus 100 in FIG. 3 is an enlarged view of the vicinity of one end E1 of the branch pipe 13-11 in FIG. 2. FIG. 3 is another enlarged view of the vicinity of one end E1 of the branch pipe 13-11 in FIG. 2. FIG. It is a top view of the exhaust gas treatment apparatus 200 of a comparative example. 6 is an enlarged view of the vicinity of one end E1 of the branch pipe 13-11 in FIG. 5. FIG. It is a figure which shows another example in the top view of the waste gas treatment apparatus 100 in FIG. It is a figure which shows another example in the top view of the waste gas treatment apparatus 100 in FIG. It is a figure which shows another example in the top view of the waste gas treatment apparatus 100 in FIG. 3 is a perspective view showing another example of the trunk pipe 12 shown in FIG. 2. FIG. 3 is a diagram showing an example of the relationship between the frequency f of the main pipe 12-3 and the response displacement D in the exhaust gas treatment apparatus 100 shown in FIG. 2. FIG. 4 is a diagram showing an example of the relationship between the frequency f of the main pipe 12-2 and the response displacement D; FIG. FIG. 8 is a diagram showing an example of the relationship between the frequency f of the main pipe 12-3 and the response displacement D in the exhaust gas treatment apparatus 100 shown in FIG. 7; 8 is a diagram showing another example of the relationship between the frequency f of the main pipe 12-2 and the response displacement D; FIG. 9 is a diagram showing an example of the relationship between the frequency f of the main pipe 12-3 and the response displacement D in the exhaust gas treatment apparatus 100 shown in FIG. 8. FIG. 8 is a diagram showing another example of the relationship between the frequency f of the main pipe 12-2 and the response displacement D; FIG. FIG. 10 is a diagram showing an example of the relationship between the frequency f of the main pipe 12-3 and the response displacement D in the exhaust gas treatment apparatus 100 shown in FIG. 9; 8 is a diagram showing another example of the relationship between the frequency f of the main pipe 12-2 and the response displacement D; FIG. It is a figure which shows another example in the top view of the waste gas treatment apparatus 100 in FIG. 20 is an enlarged view of the vicinity of the other end E2 of the branch pipe 13-11 in FIG. 19. FIG. It is a figure which shows another example in the top view of the waste gas treatment apparatus 100 in FIG. An example of the relationship between the frequency f and the response displacement D of the main pipe 12-3 in the exhaust gas treatment apparatus 100 shown in FIG. 19 is added to the example of the relationship between the frequency f and the response displacement D shown in FIG. FIG. 4 is a diagram showing; An example of the relationship between the frequency f and the response displacement D of the main pipe 12-2 when the reaction tower 10 is hexagonal in top view is added to the example of the relationship between the frequency f and the response displacement D shown in FIG. It is a figure shown by doing. An example of the relationship between the frequency f and the response displacement D of the main pipe 12-3 in the exhaust gas treatment apparatus 100 shown in FIG. 21 is added to the example of the relationship between the frequency f and the response displacement D shown in FIG. It is a diagram. An example of the relationship between the frequency f and the response displacement D of the main pipe 12-2 when the reaction tower 10 is hexagonal in top view is added to the example of the relationship between the frequency f and the response displacement D shown in FIG. It is a figure shown by doing. FIG. 4 is a cross-sectional view of the branch pipe 13-11 shown in FIG. 3 taken along line AA'; 2 is an enlarged view of a trunk pipe 12-3 and branch pipes 13-9 to 13-12 in FIG. 1; FIG.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Also, not all combinations of features described in the embodiments are essential for the solution of the invention.

FIG. 1 is a diagram showing an example of an exhaust gas treatment apparatus 100 according to one embodiment of the present invention. The exhaust gas treatment device 100 includes a reaction tower 10 , a main pipe 12 and one or more branch pipes 13 . The exhaust gas treatment device 100 may include an ejection section 14 , an exhaust gas introduction pipe 32 , a discharge pipe 20 , a power unit 50 , a pump 60 and a flow control section 70 .

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

The reactor 10 is supplied with a liquid 40 that treats the exhaust gas 30 . In this example, liquid 40 is supplied to reactor 10 by 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 refers to removing harmful substances contained in the exhaust gas 30 . The liquid 40 becomes a waste liquid 46 after treating the exhaust gas 30 .

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

The ejection section 14 may be provided inside the reaction tower 10 . In this example, the ejection part 14 is connected to the branch pipe 13 . In this example, the ejection part 14 ejects the liquid 40 supplied to the branch pipe 13 into the reaction tower 10 .

Reactor 10 may have sidewalls 15 , bottom 16 , tail gas outlet 17 and interior space 18 . Reactor 10 may be cylindrical or polygonal. The reactor 10 shown in FIG. 1 is cylindrical. The internal space 18 is a space through which the exhaust gas 30 passes. The interior space 18 is the space in which the exhaust gas 30 is treated with the liquid 40 .

In this example, sidewall 15 and bottom 16 are the sidewall and bottom, respectively, of cylindrical reactor 10 . The bottom surface 16 is the surface on which the drainage 46 falls. The bottom surface 16 is a surface in contact with the internal space 18 inside the reaction tower 10 . The inner surface of the side wall 15 contacts the internal space 18 .

In this specification, technical matters may be described using the X-axis, Y-axis, and Z-axis orthogonal coordinate axes. In this specification, the plane parallel to the bottom surface 16 of the reaction tower 10 is the XY plane, and the direction from the bottom surface 16 to the exhaust gas discharge port 17 (the direction perpendicular to the bottom surface 16) is the Z axis. In this 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. FIG. 1 is a view of the reaction tower 10 viewed from the Y-axis direction.

The Z-axis direction may be the vertical direction, and the XY plane may be the horizontal plane. The Z-axis direction being the vertical direction may include the case where the Z-axis direction has a vertical component. The Z-axis direction being the vertical direction means that the Z-axis direction is not perpendicular to the vertical direction. The fact that the XY plane is horizontal may include the case where the XY plane has a component in the horizontal direction. The XY plane being horizontal means that the ZY plane is not perpendicular to the horizontal direction.

In this specification, the exhaust gas outlet 17 side is referred to as "upper", and the bottom surface 16 side is referred to as "lower". In the present specification, a view from the discharge side of the exhaust gas 30 (exhaust gas discharge port 17 side) to the introduction side (bottom surface 16 side) is referred to as a top view.

The main pipe 12 extends in the direction from the introduction side of the exhaust gas 30 to the discharge side. The introduction side of the exhaust gas 30 refers to the bottom surface 16 side of the internal space 18 . The discharge side of the exhaust gas 30 refers to the side of the exhaust gas discharge port 17 in the internal space 18 . The direction from the introduction side of the exhaust gas 30 to the discharge side refers to the traveling direction of the exhaust gas 30 in the internal space 18 . In this specification, the direction from the introduction side of the exhaust gas 30 to the discharge side is defined as a direction D. As shown in FIG. In FIG. 1, direction D is shown to the exterior of reactor 10 . In this example the direction D is parallel to the Z axis. That is, in this example, the trunk pipe 12 extends in a direction parallel to the Z-axis.

The exhaust gas treatment device 100 may include multiple main pipes 12 . In this example, the exhaust gas treatment apparatus 100 includes three trunk pipes (trunk pipe 12-1, trunk pipe 12-2 and trunk pipe 12-3). In this example, the main pipe 12-1 is provided closer to the bottom surface 16 in the Z-axis direction than the main pipe 12-2, and the main pipe 12-2 is provided closer to the bottom surface 16 in the Z-axis direction than the main pipe 12-3. It is

The branch pipe 13 extends in a direction crossing the direction D. A direction intersecting the direction D refers to a direction intersecting with the traveling direction of the exhaust gas 30 in the internal space 18 . In this example, the branch pipe 13 extends in a direction perpendicular to the direction D. As shown in FIG.

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

When the reactor 10 is viewed from the Y-axis direction, 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. do. However, the side walls 15-1 and 15-2 are not different side walls 15 because the side walls 15 surround the internal space 18 when viewed from above, as will be described later. Sidewall 15-1 and sidewall 15-2 are designations for convenience in FIG.

In this example, the central axis direction of the reaction tower 10 is the Z-axis direction. The exhaust gas discharge port 17 may be arranged at a position facing the bottom surface 16 in the central axis direction of the reaction tower 10 . The internal space 18 is a space surrounded by the side walls 15 , the bottom surface 16 and the exhaust gas outlet 17 . The internal space 18 is a space in which the exhaust gas 30 is treated inside the reaction tower 10 .

The reaction tower 10 may have an exhaust gas inlet 11 . In this example, the exhaust gas 30 that has passed through the exhaust gas introduction pipe 32 is introduced into the internal space 18 after passing through the exhaust gas introduction port 11 . The exhaust gas introduction port 11 may be provided in the side wall 15 .

Sidewalls 15 and bottom surface 16 are formed of materials that are resistant to exhaust gases 30 , liquids 40 and effluents 46 . The material may be a combination of a ferrous material such as SS400, S-TEN (registered trademark), and at least one of a coating agent and a painting agent. The material may be a copper alloy such as Nevar brass, an aluminum alloy such as aluminum brass, a nickel alloy such as Cupronickel, Hastelloy®, stainless steel such as SUS316L, SUS329J4L or SUS312.

The exhaust gas treatment device 100 may be a marine scrubber. When the exhaust gas treatment device 100 is a scrubber for a ship, the power unit 50 is, for example, an engine or boiler of the ship, and the exhaust gas 30 is, for example, exhaust gas discharged from the engine or boiler. 40 is seawater, for example. Liquid 40 may be alkaline water to which at least one of sodium hydroxide (NaOH) and sodium bicarbonate (Na ₂ CO ₃ ) is added.

The exhaust gas 30 contains harmful substances such as sulfur oxides (SO _x ). Sulfur oxide (SO _x ) is, for example, sulfurous acid gas (SO ₂ ). When the liquid 40 is a sodium hydroxide (NaOH) aqueous solution, the reaction between the sulfurous acid gas (SO ₂ ) contained in the exhaust gas 30 and sodium hydroxide (NaOH) is represented by Chemical Formula 1 below.
[Chemical Formula 1]
SO ₂ +Na ⁺ +OH ⁻ →Na+HSO ₃ ⁻

As shown in Chemical Formula 1, sulfurous acid gas (SO ₂ ) becomes hydrogen sulfite ions (HSO ₃ ⁻ ) through a chemical reaction. Liquid 40 undergoes a chemical reaction to become effluent 46 containing bisulfite ions (HSO ₃ ⁻ ). The waste liquid 46 may be discharged to the outside of the exhaust gas treatment device 100 after passing through the exhaust pipe 20 .

The exhaust gas treatment device 100 may include multiple branch pipes 13 . FIG. 1 shows branch pipes 13-1 to 13-12. In this example, the extension direction of the branch pipes 13-1 to 13-12 is the X-axis direction. In this example, the exhaust gas treatment apparatus 100 further includes a branch pipe 13 extending in a direction forming a predetermined angle with the X axis in the XY plane (described later). Not shown.

In FIG. 1, the branch pipe 13-1 and the branch pipe 13-2 are the branch pipes 13 provided closest to the bottom surface 16 in the Z-axis direction. In FIG. 1, the branch pipe 13-11 and the branch pipe 13-12 are the branch pipe 13 provided closest to the exhaust gas discharge port 17 in the Z-axis direction. The branch pipe 13 has one end E1 and the other end E2. In FIG. 1, only the branch pipe 13-1 and the branch pipe 13-2 have one end E1 and the other end E2.

In FIG. 1, one end E1 and the other end E2 of the branch pipe 13-1 are connected to the main pipe 12-1 and the side wall 15-2 respectively, and one end E1 and the other end E2 of the branch pipe 13-3 are connected to the main pipe respectively. 12-1 and sidewall 15-2. In FIG. 1, one end E1 and the other end E2 of the branch pipe 13-5 are connected to the main pipe 12-2 and the side wall 15-2 respectively, and one end E1 and the other end E2 of the branch pipe 13-7 are respectively connected to the main pipe. 12-2 and sidewall 15-2. In FIG. 1, one end E1 and the other end E2 of the branch pipe 13-9 are connected to the main pipe 12-3 and the side wall 15-2, respectively, and the one end E1 and the other end E2 of the branch pipe 13-11 are connected to the main pipe respectively. 12-3 and sidewall 15-2.

In FIG. 1, one end E1 and the other end E2 of the branch pipe 13-2 are connected to the main pipe 12-1 and the side wall 15-1, respectively, and one end E1 and the other end E2 of the branch pipe 13-4 are connected to the main pipe. 12-1 and sidewall 15-1. In FIG. 1, one end E1 and the other end E2 of the branch pipe 13-6 are connected to the main pipe 12-2 and the side wall 15-1 respectively, and one end E1 and the other end E2 of the branch pipe 13-8 are respectively connected to the main pipe. 12-2 and sidewall 15-1. In FIG. 1, one end E1 and the other end E2 of the branch pipe 13-10 are connected to the main pipe 12-3 and the side wall 15-1, respectively, and the one end E1 and the other end E2 of the branch pipe 13-12 are respectively connected to the main pipe. 12-3 and sidewall 15-1.

The exhaust gas treatment device 100 may include a plurality of jetting sections 14 . In this example, the ejection portions 14-1 to 14-12 are connected to the branch pipes 13-1 to 13-12, respectively. The exhaust gas introduction port 11 may be provided closer to the bottom surface 16 than the ejection portion 14-1.

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

FIG. 2 is a diagram showing an example of a top view of the exhaust gas treatment apparatus 100 in FIG. However, FIG. 2 omits components other than the reaction tower 10, the main pipe 12 and the branch pipe 13 shown in FIG. In this example, the internal space 18 is circular in top view. The internal space 18 is surrounded by the side walls 15 when viewed from above.

A main pipe 12 is provided inside the reaction tower 10 . The central position of the reaction tower 10 when viewed from above is defined as the center Ce. The reaction tower 10 of this example has a cylindrical shape extending in the Z-axis direction. In this example, the position of the central axis of the columnar reaction tower 10 is the center Ce.

The shape of the trunk pipe 12 in top view may be polygonal. In FIG. 2 , the shape of the main pipe 12 in top view may be a top view from the position of the exhaust gas discharge port 17 in the Z-axis direction. The shape of the main pipe 12 in top view means that the XY cross section including the position of one end E1 of the branch pipe 13-11 in the Z-axis direction and the position of one end E1 of the branch pipe 13-12 in the Z-axis direction is defined by the exhaust gas 30. It may be viewed from the discharge side to the introduction side. The shape of the trunk pipe 12 in top view may be a regular polygon. In this example, the shape is a regular hexagon. The trunk pipe 12 may have a polygonal columnar shape extending in the direction D. As shown in FIG. The trunk pipe 12 of this example has a regular hexagonal prism shape. In this example, the position of the central axis of the hexagonal columnar trunk pipe 12 is the center Ce.

The diameter of the trunk pipe 12 in top view is defined as diameter di. The diameter di may be the largest diameter among the diameters of the trunk pipe 12 passing through the center Ce in top view. In this example, it is the distance from the portion of the trunk pipe 12-3 to which one end E1 of the branch pipe 13-11 is connected to the portion to which the one end E1 of the branch pipe 13-12 is connected.

The exhaust gas treatment device 100 may be a cyclonic scrubber in which the exhaust gas 30 spirals through the internal space 18 . When the exhaust gas treatment device 100 is a cyclone scrubber, the exhaust gas 30 spirally (cyclone-like) turns in the internal space 18 when viewed from the Z-axis direction, and exhaust gas when viewed from the XY plane direction. It progresses from the introduction side (bottom surface 16 side) of 30 to the discharge side (exhaust gas discharge port 17 side). In FIG. 2, the swirling direction of the exhaust gas 30 is indicated by a thick arrow.

FIG. 3 is an enlarged view of the vicinity of one end E1 of the branch pipe 13-11 in FIG. In FIG. 3, the two sides of the branch pipe 13-11 extending in the extending direction of the branch pipe 13-11 (the X-axis direction in this example) are defined as sides 81 and 82, respectively. The position in the Y-axis direction of the intersection of the outer shape of the main pipe 12-3 and the side 81 is defined as a position P1. The position in the Y-axis direction of the intersection of the outer shape of the trunk pipe 12-3 and the side 82 is defined as a position P4. The AA' line will be described later.

The shape of the trunk pipe 12 in top view may have a first portion 91 with a first curvature and a second portion 92 with a second curvature. Let the said 1st curvature be the 1st curvature R1, and let the said 2nd curvature be the 2nd curvature R2. The second curvature R2 is greater than the first curvature R1. That the trunk pipe 12 has the first portion 91 and the second portion 92 in the top view shape means that the trunk pipe 12 has the first portion 91 and the second portion 92 in the top view. You can point The curvature of the trunk pipe 12 in top view may refer to the curvature of the outer shape of the trunk pipe 12 in top view.

In this example, the first portion 91 is linear when viewed in direction D. As shown in FIG. In this example, the first curvature R1 is zero.

The positions of one end and the other end of the second portion 92 in the Y-axis direction are assumed to be positions P2 and P3, respectively. In this example, the shape of the main pipe 12 in top view has a first portion 91 between positions P1 and P2 and between positions P3 and P4, and between positions P2 and P3. It has a second portion 92 . One end E<b>1 of the branch pipe 13 is connected to the second portion 92 of the main pipe 12 when viewed from above.

When the exhaust gas treatment device 100 is mounted on a ship, the ship is likely to be subject to vibrations in the vertical direction according to ocean conditions during navigation. When the ship receives vertical vibration, the exhaust gas treatment device 100 tends to vibrate in the vertical direction. When the exhaust gas treatment device 100 vibrates in the vertical direction, the main pipe 12 and the branch pipes 13 tend to transiently resonate with the vibration of the exhaust gas treatment device 100 . When the main pipe 12 and the branch pipe 13 transiently resonate, the connecting portion between the one end E1 of the branch pipe 13 and the main pipe 12, the other end E2 of the branch pipe 13 (see FIGS. 1 and 2) and the side wall 15 At least one of the connection parts with is easily damaged.

In the exhaust gas treatment apparatus 100, when viewed from above, the one end E1 of the branch pipe 13 is connected to the second portion 92 of the trunk pipe 12, and the second curvature R2 of the second portion 92 is the first curvature of the first portion 91. Greater than R1. Therefore, even if the trunk pipe 12 and the branch pipe 13 transiently resonate, the connection portion between the one end E1 of the branch pipe 13 and the trunk pipe 12 is only the first portion 91 where the one end E1 of the branch pipe 13 is the first portion 91. less likely to be damaged than when connected to

One end E<b>1 of the branch pipe 13 may be connected to the second portion 92 and the first portion 91 of the main pipe 12 when viewed from above. Since the first curvature R1 of the first portion 91 and the second curvature R2 of the second portion 92 are different, by connecting the one end E1 to the second portion 92 and the first portion 91, the main pipe 12 and the branch pipe 13 Even in the case of transient resonance, the connecting portion between the one end E1 of the branch pipe 13 and the main pipe 12 is less likely to be damaged.

A portion of the outer shape of the trunk pipe 12 that includes the first portion 91 and the second portion 92 is referred to as a first corner portion 93 . In this example, the first corner 93 includes two first portions 91 and one second portion 92 . One end E<b>1 of the branch pipe 13 may be connected to the first corner portion 93 of the main pipe 12 when viewed from above.

The second portion 92 may be the vertex of the first corner portion 93 . When the second portion 92 is the vertex of the first corner portion 93, the position P2 and the position P3 in the Y-axis direction match. When the second portion 92 is the vertex of the first corner 93, the first corner 93 includes two straight line portions that intersect each other.

FIG. 4 is another enlarged view of the vicinity of one end E1 of the branch pipe 13-11 in FIG. In this example, the second portion 92 of the trunk pipe 12 is convex in the direction from one end E1 to the other end E2 (see FIGS. 1 and 2). The trunk pipe 12 of this example differs from the trunk pipe 12 shown in FIG. 3 in this respect. A position S is the position closest to the other end E2 of the second portion 92 in the X-axis direction. In the example of FIG. 4, the second portion being convex means that the position S is located closer to the other end E2 than the position where the extension lines of the two first portions 91 intersect in the X-axis direction. refers to the state of

In this example, one end E<b>1 of the branch pipe 13 is connected to the convex second portion 92 of the main pipe 12 . Therefore, even if the trunk pipe 12 and the branch pipe 13 transiently resonate, the connection portion between the one end E1 of the branch pipe 13 and the trunk pipe 12 is only the first portion 91 where the one end E1 of the branch pipe 13 is the first portion 91. less likely to be damaged than when connected to

FIG. 5 is a top view of an exhaust gas treatment apparatus 200 of a comparative example. The exhaust gas treatment device 200 includes a main pipe 22 extending in the direction D. As shown in FIG. In the exhaust gas treatment apparatus 200, the trunk pipe 22 has a circular shape when viewed from above. The exhaust gas treatment apparatus 200 differs from the exhaust gas treatment apparatus 100 in this respect. The diameter of the trunk pipe 22 is the same as the diameter di of the trunk pipe 12 shown in FIG.

FIG. 6 is an enlarged view of the vicinity of one end E1 of the branch pipe 13-11 in FIG. A curved portion 99 is defined as the profile of the main pipe 22-3 from the position P1 to the position P4 in the Y-axis direction. In the comparative example, one end E1 of the branch pipe 13-11 is connected to the curved portion 99. FIG. Since the trunk pipe 22 is circular in top view, the curvature of the curved portion 99 is the same from position P1 to position P4. Let the curvature of the curved portion 99 be curvature Rc.

The second curvature R2 of the second portion 92 in FIG. 3 is greater than the curvature Rc. 3, one end E1 of the branch pipe 13 is connected to the second portion 92 of the main pipe 12. As shown in FIG. Therefore, when the exhaust gas treatment device 100 and the exhaust gas treatment device 200 vibrate in the same manner, the connecting portion between the one end E1 of the branch pipe 13 and the main pipe 12 in FIG. It is less likely to be damaged than the connecting portion with 22.

When viewed from above, the trunk pipe 12 may have a plurality of first corners 93 (see FIGS. 2 to 4). In the example of FIG. 2, trunk pipe 12 has six first corners 93 . Each of the multiple branch pipes 13 may be connected to each of the multiple first corners 93 . In the example of FIG. 2 , each of the six branch pipes 13 is connected to each of the six first corners 93 .

The number of first corners 93 may be greater than or equal to the number of branch pipes 13 . If the number of first corners 93 is greater than the number of branch pipes 13, branch pipes 13 may not be connected to at least one first corner. The number of first corners 93 and the number of branch pipes 13 are preferably equal.

The other end E<b>2 (see FIG. 2 ) of the branch pipe 13 may be connected to the side wall 15 . One end E1 (see FIG. 2) of the branch pipe 13 is connected to the second portion 92 of the main pipe 12, and the other end E2 of the branch pipe 13 is connected to the side wall 15, whereby the main pipe 12 and the branch pipe 13 transiently resonates, the vibration of the branch pipe 13 tends to be smaller than when the other end E2 of the branch pipe 13 is not connected to the side wall 15 . Therefore, the connecting portion between the one end E1 of the branch pipe 13 and the trunk pipe 12 is less likely to be damaged. The other end E2 of each of the multiple branch pipes 13 may be connected to the side wall 15 .

FIG. 7 is a diagram showing another example of a top view of the exhaust gas treatment apparatus 100 in FIG. The shape of the trunk pipe 12 in top view may be a pentagonal shape. In this example, the shape of the trunk pipe 12 in top view is a regular pentagon. The exhaust gas treatment apparatus 100 of this example differs from the exhaust gas treatment apparatus 100 shown in FIG. 2 in this respect.

FIG. 8 is a top view showing another example of the exhaust gas treatment apparatus 100 in FIG. The trunk pipe 12 may have a quadrangular shape when viewed from above. In this example, the shape of the main pipe 12 in top view is square. The exhaust gas treatment apparatus 100 of this example differs from the exhaust gas treatment apparatus 100 shown in FIG. 2 in this respect.

FIG. 9 is a diagram showing another example of a top view of the exhaust gas treatment apparatus 100 in FIG. The shape of the trunk pipe 12 in top view may be triangular. In this example, the shape of the main pipe 12 in top view is an equilateral triangle. The exhaust gas treatment apparatus 100 of this example differs from the exhaust gas treatment apparatus 100 shown in FIG. 2 in this respect.

The shape of the trunk pipe 12 in a top view may be a polygon of hexagon or more. The shape of the trunk pipe 12 in a top view may be a regular hexagon or a regular polygon.

When viewed from above, the shape of one trunk pipe 12 among the plurality of trunk pipes 12 may be different from the shape of the other trunk pipes 12 . For example, when viewed from above, the trunk pipe 12-3 may have a hexagonal shape (FIG. 2), and the trunk pipe 12-2 may have a pentagonal shape (FIG. 7).

When viewed from above, the first corner 93 of one main pipe 12 is referred to as a first corner 93-1, and the first corner 93 of the other main pipe 12 is referred to as a first corner 93-2. When the shape of one trunk pipe 12 and the shape of the other trunk pipe 12 are the same in top view, the position of the first corner 93-1 and the position of the first corner 93-2 are the same. It can be and it can be different.

That the position of the first corner 93-1 and the position of the first corner 93-2 are the same means that the diameter di of one trunk pipe 12 (see FIG. 2) and the diameter di of the other trunk pipe 12 are equal to each other, it means that the first corner 93-1 and the first corner 93-2 overlap when viewed from above. That the position of the first corner 93-1 and the position of the first corner 93-2 are the same means that the diameter di of one trunk pipe 12 (see FIG. 2) and the diameter di of the other trunk pipe 12 are different, the direction from the center Ce (see FIG. 2) to the first corner 93-1 in the XY plane is the same as the direction from the center Ce to the first corner 93-2 in the XY plane. refers to the case where

FIG. 10 is a perspective view showing another example of the trunk pipe 12 shown in FIG. In FIG. 10, configurations other than the main pipe 12-3 are omitted. In this example, the trunk pipe 12 is helical. In this example, the trunk pipe 12 is a spiral hexagonal column. Due to the helical shape of the trunk pipe 12, the position of the first corner portion 93 (see FIGS. 3 and 4) in the XY plane differs depending on the position in the Z-axis direction. Therefore, in the one branch pipe 13 and the other branch pipe 13 that are connected to different positions in the Z-axis direction, the extension direction of the one branch pipe 13 and the extension of the other branch pipe 13 in the XY plane different direction. Therefore, even when the exhaust gas treatment apparatus vibrates, the one branch pipe 13 is more likely to move than when the extension direction of the one branch pipe 13 and the extension direction of the other branch pipe 13 are the same. The vibration and the vibration of the other branch pipes 13 are easily offset.

FIG. 11 is a diagram showing an example of the relationship between the frequency f of the main pipe 12-3 and the response displacement D in the exhaust gas treatment apparatus 100 shown in FIG. In FIG. 11, the frequency f of the main pipe 12-3 indicates the vibration frequency of the main pipe 12-3. FIG. 11 shows, as a comparative example, the relationship between the frequency f and the response displacement D when the main pipe 12-3 is circular in top view (in the case of FIG. 5). In this example, the number of branch pipes 13 is six when the main pipe 12-3 is hexagonal and circular. 11, the shape of the main pipe 12 and the reaction tower 10 is indicated by solid lines, and the shape of the branch pipe 13 is indicated by thick solid lines.

Let frequency fu1′ be the resonance frequency when the main pipe 12-3 is hexagonal, and let Du1′ be the maximum response displacement. The resonance frequency in the case where the main pipe 12-2 is circular is defined as frequency fu1, and the maximum response displacement is defined as response displacement Du1. The response displacement Du1' is smaller than the response displacement Du1. That is, the vibration of the trunk pipe 12-3 when the trunk pipe 12-3 is hexagonal is more easily suppressed than the vibration of the trunk pipe 12-3 when the trunk pipe 12-3 is circular. Frequency fu1' is greater than frequency fu1.

FIG. 12 is a diagram showing an example of the relationship between the frequency f and the response displacement D of the main pipe 12-2. FIG. 12 shows an example of the relationship between the frequency f and the response displacement D when the main pipe 12-2 is hexagonal and circular when viewed from above. Also in this example, the number of branch pipes 13 is six when the main pipe 12-2 is hexagonal and circular.

Let frequency fd1′ be the resonance frequency when the main pipe 12-2 is hexagonal, and let Dd1′ be the maximum response displacement. Let frequency fd1 be the resonance frequency when the main pipe 12-2 is circular, and let Dd1 be the maximum response displacement. As in the case of FIG. 11, the response displacement Dd1' is smaller than the response displacement Dd1, and the frequency fd1' is larger than the frequency fd1.

In the example shown in FIG. 1, the diameter of the trunk pipe 12-2 in top view is larger than the diameter of the trunk pipe 12-3 in top view. Therefore, the rate of decrease of the response displacement D (=Dd1'/Dd1) of the trunk pipe 12-2 tends to be greater than the rate of decrease of the response displacement D (=Du1'/Du1) of the trunk pipe 12-3.

FIG. 13 is a diagram showing an example of the relationship between the frequency f of the main pipe 12-3 and the response displacement D in the exhaust gas treatment apparatus 100 shown in FIG. FIG. 13 shows an example of the relationship between the frequency f and the response displacement D when the main pipe 12-3 is pentagonal (in the case of FIG. 7) and circular when viewed from above. In this example, the number of branch pipes 13 is five when the main pipe 12-3 is pentagonal and circular.

Let frequency fu2′ be the resonance frequency and the maximum response displacement Du2′ be the resonance frequency when the main pipe 12-3 has a pentagonal shape. The resonance frequency in the case where the main pipe 12-3 is circular is defined as frequency fu2, and the maximum response displacement is defined as response displacement Du2. As in the case of FIG. 11, the response displacement Du2' is smaller than the response displacement Du2. That is, the vibration of the trunk pipe 12-3 when the trunk pipe 12-3 is pentagonal is easier to suppress than the vibration of the trunk pipe 12-3 when the trunk pipe 12-3 is circular. Frequency fu2' is greater than frequency fu2.

FIG. 14 is a diagram showing another example of the relationship between the frequency f and the response displacement D of the main pipe 12-2. FIG. 14 shows an example of the relationship between the frequency f and the response displacement D when the main pipe 12-2 is pentagonal and circular when viewed from above. Also in this example, the number of branch pipes 13 is five when the main pipe 12-2 is pentagonal and circular.

Let frequency fd2′ be the resonance frequency and Dd2′ be the maximum response displacement when the main pipe 12-2 is pentagonal. Let frequency fd2 be the resonance frequency when the main pipe 12-2 is circular, and let Dd2 be the maximum response displacement. As in the case of FIG. 13, the response displacement Dd2' is smaller than the response displacement Dd2, and the frequency fd2' is larger than the frequency fd2. Similar to the case where the trunk pipes 12-2 and 12-3 are hexagonal in top view, the rate of decrease of the response displacement D in the trunk pipe 12-2 (=Dd2′/Dd2) is is likely to be larger than the rate of decrease of the response displacement D (=Du2'/Du2).

FIG. 15 is a diagram showing an example of the relationship between the frequency f of the main pipe 12-3 and the response displacement D in the exhaust gas treatment apparatus 100 shown in FIG. FIG. 15 shows an example of the relationship between the frequency f and the response displacement D when the main pipe 12-3 is square (in the case of FIG. 8) and circular when viewed from above. In this example, the number of branch pipes 13 is four when the main pipe 12-3 is rectangular and circular.

The resonance frequency in the case where the main pipe 12-3 is square is defined as frequency fu3', and the maximum response displacement is defined as response displacement Du3'. The resonance frequency in the case where the main pipe 12-3 is circular is defined as frequency fu3, and the maximum response displacement is defined as response displacement Du3. 11 and 13, the response displacement Du3' is smaller than the response displacement Du3. That is, the vibration of the trunk pipe 12-3 when the trunk pipe 12-3 is rectangular is more easily suppressed than the vibration of the trunk pipe 12-3 when the trunk pipe 12-3 is circular. Frequency fu3' is greater than frequency fu3.

FIG. 16 is a diagram showing another example of the relationship between the frequency f and the response displacement D of the main pipe 12-2. FIG. 16 shows an example of the relationship between the frequency f and the response displacement D when the main pipe 12-2 is rectangular and circular when viewed from above. Also in this example, the number of branch pipes 13 is four when the main pipe 12-2 is rectangular and circular.

The resonance frequency when the main pipe 12-2 is square is defined as frequency fd3', and the maximum response displacement is defined as response displacement Dd3'. Let frequency fd3 be the resonance frequency when the main pipe 12-2 is circular, and let Dd3 be the maximum response displacement. As in the case of FIG. 15, the response displacement Dd3' is smaller than the response displacement Dd3, and the frequency fd3' is larger than the frequency fd3. Similar to the case where the trunk pipes 12-2 and 12-3 are hexagonal in top view, the rate of decrease in the response displacement D in the trunk pipe 12-2 (=Dd3′/Dd3) is is likely to be greater than the rate of decrease of the response displacement D (=Du3'/Du3).

FIG. 17 is a diagram showing an example of the relationship between the frequency f of the main pipe 12-3 and the response displacement D in the exhaust gas treatment apparatus 100 shown in FIG. FIG. 17 shows an example of the relationship between the frequency f and the response displacement D when the main pipe 12-3 is triangular (in the case of FIG. 9) and circular when viewed from above. In this example, the number of branch pipes 13 is three when the main pipe 12-3 is triangular and circular.

Let frequency fu4′ be the resonance frequency when the main pipe 12-3 is triangular, and let Du4′ be the maximum response displacement. The resonance frequency in the case where the main pipe 12-3 is circular is defined as frequency fu4, and the maximum response displacement is defined as response displacement Du4. 11, 13 and 15, the response displacement Du4' is smaller than the response displacement Du4. That is, the vibration of the trunk pipe 12-3 when the trunk pipe 12-3 is triangular is more easily suppressed than the vibration of the trunk pipe 12-3 when the trunk pipe 12-3 is circular. Frequency fu4' is greater than frequency fu4.

FIG. 18 is a diagram showing another example of the relationship between the frequency f and the response displacement D of the main pipe 12-2. FIG. 18 shows an example of the relationship between the frequency f and the response displacement D when the main pipe 12-2 is triangular and circular when viewed from above. Also in this example, the number of branch pipes 13 is three when the main pipe 12-2 is triangular and circular.

Let frequency fd4′ be the resonance frequency when the main pipe 12-2 is triangular, and let Dd4′ be the maximum response displacement. Let frequency fd4 be the resonance frequency when the main pipe 12-2 is circular, and let Dd4 be the maximum response displacement. As in the case of FIG. 17, the response displacement Dd4' is smaller than the response displacement Dd4, and the frequency fd4' is larger than the frequency fd4. Similar to the case where the trunk pipes 12-2 and 12-3 are hexagonal in top view, the rate of decrease (=Dd4′/Dd4) of the response displacement D in the trunk pipe 12-2 is is likely to be larger than the rate of decrease of the response displacement D (=Du4'/Du4).

FIG. 19 is a top view showing another example of the exhaust gas treatment apparatus 100 in FIG. However, illustration of one end E1 and the other end E2 of the branch pipe 13 is omitted in FIG. The shape of the reaction tower 10 when viewed from above may be polygonal. The shape of the reaction tower 10 when viewed from above may be hexagonal. In this example, the shape of the reaction tower 10 in top view is a regular hexagon. The exhaust gas treatment apparatus 100 of this example differs from the exhaust gas treatment apparatus 100 shown in FIG. 2 in this respect.

FIG. 20 is an enlarged view of the vicinity of the other end E2 of the branch pipe 13-11 in FIG. The position in the Y-axis direction of the point where the side wall 15 and the side 81 intersect is assumed to be the position Q1. The position in the Y-axis direction of the intersection of the side wall 15 and the side 82 is defined as position Q4.

The shape of the internal space 18 in top view may have a third portion 61 with a third curvature and a fourth portion 62 with a fourth curvature. Let the said 3rd curvature be the 3rd curvature R3, and let the said 4th curvature be the 4th curvature R4. The fourth curvature R4 is greater than the third curvature R3. That the shape of the internal space 18 in top view has the third portion 61 and the fourth portion 62 means that the shape of the inner surface of the side wall 15 in top view has the third portion 61 and the fourth portion 62 . You can point The inner side surface is the side surface of the side wall 15 that is in contact with the internal space 18 . The curvature of the internal space 18 in top view may refer to the curvature of the inner surface of the side wall 15 in top view.

In this example, the third portion 61 is linear when viewed from the direction D. As shown in FIG. In this example, the third curvature R3 is zero.

The positions of one end and the other end of the fourth portion 62 in the Y-axis direction are assumed to be positions Q2 and Q3, respectively. In this example, the shape of the internal space 18 in top view has a third portion 61 between the position Q1 and the position Q2 and between the position Q3 and the position Q4, and between the position Q2 and the position Q3. It has a fourth portion 62 .

The other end E2 of the branch pipe 13 is connected to the fourth portion 62 when viewed from above. Therefore, even if the trunk pipe 12 and the branch pipe 13 transiently resonate, the connecting portion between the other end E2 of the branch pipe 13 and the side wall 15 is the third portion 61 where the other end E2 of the branch pipe 13 is the third portion 61. less likely to be damaged than when connected only to

The other end E2 of the branch pipe 13 may be connected to the fourth portion 62 and the third portion 61 when viewed from above. Since the third curvature R3 of the third portion 61 and the fourth curvature R4 of the fourth portion 62 are different, by connecting the other end E2 to the fourth portion 62 and the third portion 61, the trunk pipe 12 and the branch pipe Even if 13 transiently resonates, the connecting portion between the other end E2 of the branch pipe 13 and the side wall 15 is less likely to be damaged.

A part of the shape of the internal space 18 that includes the third part 61 and the fourth part 62 is called a second corner 63 . In this example, the second corner 63 includes two third portions 61 and one fourth portion 62 . The second corner 63 may have an acute angle, a right angle, or an obtuse angle.

When viewed from above, the shape of the internal space 18 may have a plurality of second corners 63 . The other end E2 of the branch pipe 13 may be connected to the second corner portion 63 of the internal space 18 when viewed from above. The number of the plurality of first corners 93 (see FIGS. 3 and 4) and the number of the plurality of second corners 63 may be equal. FIG. 19 shows an example in which the number of first corners 93 and the number of second corners 63 are six.

FIG. 21 is a diagram showing another example of the exhaust gas treatment apparatus 100 in FIG. 1 as viewed from above. In this example, the shape of the main pipe 12 in top view is an equilateral triangle. The exhaust gas treatment apparatus 100 of this example differs from the exhaust gas treatment apparatus 100 shown in FIG. 19 in this respect.

The number of first corners 93 and the number of second corners 63 may be different. In this example, the number of first corners 93 is three, and the number of second corners 63 is six. The number of the multiple second corners 63 may be greater than the number of the multiple first corners 93 . The number of second corners 63 may be an integral multiple of the number of first corners 93 . In this example, the number of second corners 63 is twice the number of first corners 93 . Since the number of the second corners 63 is an integral multiple of the number of the first corners 93, the other end E2 of the branch pipe 13, the one end E1 of which is connected to the first corner 93, is connected to the second corner 63. become connectable.

The other end E2 of each of the plurality of branch pipes 13 may be connected to each of the plurality of second corners 63 on the side wall 15 of the reaction tower. In the example shown in FIG. 19, the other ends E2 of the six branch pipes 13 are connected to the six second corners 63 (see FIG. 20) of the side wall 15, respectively. In the example shown in FIG. 21 , the other end E2 of each of the three branch pipes 13 is connected to each of the three second corners 63 out of the six second corners 63 of the side wall 15 .

FIG. 22 shows an example of the relationship between the frequency f and the response displacement D shown in FIG. 11, and an example of the relationship between the frequency f and the response displacement D of the main pipe 12-3 in the exhaust gas treatment apparatus 100 shown in FIG. It is a figure shown additionally. The resonance frequency in the case where the reaction tower 10 is hexagonal is defined as frequency fu1'', and the maximum response displacement is defined as response displacement Du1''. The response displacement Du1'' is even smaller than the response displacement Du1'. That is, the vibration of the main pipe 12-3 when the reaction tower 10 is hexagonal is more easily suppressed than the vibration of the main pipe 12-3 when the reaction tower 10 is circular. Frequency fu1'' is even greater than frequency fu1'.

FIG. 23 is an example of the relationship between the frequency f and the response displacement D shown in FIG. 12, and shows the relationship between the frequency f and the response displacement D of the main pipe 12-2 when the reaction tower 10 is hexagonal in top view. It is a figure which adds and shows an example of. Let frequency fd1'' be the resonance frequency when the reaction tower 10 is hexagonal, and let Dd1'' be the maximum response displacement. As in the case of FIG. 22, the response displacement Dd1'' is much smaller than the response displacement Dd1', and the frequency fd1'' is much larger than the frequency fd1'.

FIG. 24 shows an example of the relationship between the frequency f and the response displacement D shown in FIG. 17, and an example of the relationship between the frequency f and the response displacement D of the main pipe 12-3 in the exhaust gas treatment apparatus 100 shown in FIG. It is a figure shown additionally. The resonance frequency in the case where the reaction tower 10 is hexagonal is defined as frequency fu4'', and the maximum response displacement is defined as response displacement Du4''. The response displacement Du4'' is even smaller than the response displacement Du4'. That is, the vibration of the main pipe 12-3 when the reaction tower 10 is hexagonal is more easily suppressed than the vibration of the main pipe 12-3 when the reaction tower 10 is circular. Frequency fu4'' is even greater than frequency fu4'.

FIG. 25 is an example of the relationship between the frequency f and the response displacement D shown in FIG. 18, and shows the relationship between the frequency f and the response displacement D of the main pipe 12-2 when the reaction tower 10 is hexagonal in top view. It is a figure which adds and shows an example of. Let frequency fd4'' be the resonance frequency when the reaction tower 10 is hexagonal, and let Dd4'' be the maximum response displacement. As in the case of FIG. 24, the response displacement Dd4'' is much smaller than the response displacement Dd4', and the frequency fd4'' is much larger than the frequency fd4'.

FIG. 26 is a cross-sectional view of the branch pipe 13-11 shown in FIG. 3 taken along line AA'. The branch pipe 13-11 extends in the X-axis direction. AA' line intersects the extension direction of the branch pipe 13-11. In FIG. 26, the AA' cross section is the YZ cross section perpendicular to the extending direction of the branch pipe 13-11.

Branch tube 13 has an outer wall 80 and an inner space 85 . The internal space 85 is a space surrounded by the outer wall 80 . Liquid 40 (see FIG. 1) passes through interior space 85 . The outer side surface 84 is the side surface of the outer wall 80 that is in contact with the internal space 18 (see FIG. 1) of the reaction tower 10 . The inner side surface 86 is a side surface of the outer wall 80 that contacts the internal space 85 .

The width of the branch pipe 13 in the direction D (Z-axis direction) from the introduction side of the exhaust gas 30 to the discharge side is defined as the width W1, and the width of the branch pipe 13 in the direction intersecting the direction D (in this example, the Y-axis direction) is defined as Let the width be W2. Width W1 may be greater than width W2.

As described above, when the exhaust gas treatment device 100 is mounted on a ship, the ship is likely to be subjected to vertical vibrations depending on the state of the ocean during navigation. Therefore, when the width W1 is larger than the width W2, the branch pipe 13 is less likely to resonate with vibrations in the direction D. As shown in FIG.

The width W1 of the branch pipe 13 may refer to the width of the outer side surface 84 in the D direction, or may refer to the width of the inner side surface 86 in the D direction. In this example, width W1 refers to the width of outer surface 84 . The width W2 of the branch pipe 13 may refer to the width of the outer side surface 84 in the direction intersecting the direction D, or may refer to the width of the inner side surface 86 in the direction intersecting the direction D. In this example, width W2 refers to the width of outer surface 84 .

The cross section of the branch pipe 13 may be elliptical. FIG. 26 shows an example in which the cross section of the branch pipe 13 is elliptical. The elliptical cross-section of the branch pipe 13 may refer to the elliptical outer surface 84 or the elliptical inner surface 86 . If the cross section of the branch pipe 13 is elliptical, the major axis of the ellipse may be parallel to the direction D. As a result, the branch pipe 13 is less likely to resonate with vibrations in the direction D. As shown in FIG. The cross section of the branch pipe 13 taken along the line AA' may be rectangular with the width W1 being greater than the width W2.

FIG. 27 is an enlarged view of the trunk pipe 12-3 and the branch pipes 13-9 to 13-12 in FIG. In this example, one end E1 of the branch pipe 13 is connected to the second portion 92 of the trunk pipe 12 (see FIGS. 3 and 4).

The angle formed by the branch pipe 13 and the trunk pipe 12 in the direction intersecting the direction D (the Y-axis direction in this example) is defined as an angle θ. When the branch pipe 13 and the trunk pipe 12 are not perpendicular and parallel, the angle θ formed by the branch pipe 13 and the trunk pipe 12 may refer to the acute angle or the obtuse angle. The angle θ may be greater than 0 degrees and less than 90 degrees. When the angle θ is greater than 0 degrees and less than 90 degrees, even when the exhaust gas treatment device 100 vibrates, the transient vibration of the main pipe 12 and the branch pipes 13 is greater than when the angle θ is 90 degrees. is easy to suppress. One end E1 of the branch pipe 13 is connected to the second portion 92 of the main pipe 12, and the angle θ is greater than 0 degrees and less than 90 degrees, thereby further suppressing transient vibration of the main pipe 12 and the branch pipes 13. easier to suppress.

FIG. 27 shows an example in which the other end E2 is arranged closer to the discharge side of the exhaust gas 30 than the one end E1. The other end E2 may be arranged closer to the introduction side of the exhaust gas 30 than the one end E1.

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 is obvious to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the description of the scope of claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

The execution order of each process such as actions, procedures, steps, and stages in the devices, systems, programs, and methods shown in the claims, the specification, and the drawings is particularly "before", "before etc., and 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 specification, and the drawings, even if the description is made using "first," "next," etc. for the sake of convenience, it means that it is essential to carry out in this order. not a thing

DESCRIPTION OF SYMBOLS 10... Reaction tower, 11... Exhaust gas inlet, 12... Main pipe, 13... Branch pipe, 14... Ejection part, 15... Side wall, 16... Bottom surface, 17. Exhaust gas outlet 18 Internal space 20 Exhaust pipe 22 Trunk pipe 30 Exhaust gas 32 Exhaust gas introduction pipe 40 Liquid 46 Drainage, 50 Power unit, 60 Pump, 61 Third portion, 62 Fourth portion, 63 Second corner, 70 Flow control unit, 72... valve, 80... outer wall, 81... side, 82... side, 84... outer surface, 85... inner space, 86... inner surface, 91... third 1 part, 92... second part, 93... first corner part, 99... curve part, 100... exhaust gas treatment device, 200... exhaust gas treatment device

Claims (15)

a reactor into which an exhaust gas is introduced and supplied with a liquid for treating said exhaust gas;
a trunk pipe provided inside the reaction tower, supplied with the liquid, and extending in a direction from the exhaust gas introduction side to the discharge side;
one or more branch pipes provided inside the reaction tower, supplied with the liquid, and extending in a direction intersecting the direction from the introduction side of the exhaust gas to the discharge side thereof;
with
The shape of the main pipe when viewed in the direction from the exhaust gas discharge side to the exhaust gas introduction side has a first portion with a first curvature and a second portion with a second curvature larger than the first portion. have
One end of the branch pipe is connected to the second portion of the main pipe when viewed from the exhaust gas discharge side to the introduction side,
Exhaust gas treatment equipment. 2. The exhaust gas according to claim 1, wherein one end of said branch pipe is connected to said second portion and said first portion of said trunk pipe when viewed in a direction from said exhaust gas discharge side to said exhaust gas introduction side. processing equipment. When viewed in the direction from the exhaust gas discharge side to the exhaust gas introduction side, one end of the branch pipe is a first corner portion of the trunk pipe that includes the second portion and the first portion. 3. The exhaust gas treatment device according to claim 2, which is connected to . When viewed in the direction from the discharge side of the exhaust gas to the introduction side, the main pipe has a plurality of the first corners,
Each of the plurality of branch pipes is connected to each of the plurality of first corners of the trunk pipe,
The exhaust gas treatment apparatus according to claim 3. 5. The exhaust gas treatment apparatus according to claim 4, wherein the main pipe has a polygonal shape when viewed from the exhaust gas discharge side to the exhaust gas introduction side. 6. The exhaust gas treatment apparatus according to claim 4, wherein the other end of said branch pipe is connected to a side wall of said reaction tower. The reaction tower has an internal space through which the exhaust gas passes,
The shape of the internal space when viewed in the direction from the discharge side of the exhaust gas to the introduction side has a plurality of second corners,
The exhaust gas treatment device according to any one of claims 4 to 6. The exhaust gas treatment device according to claim 7, wherein the number of said plurality of first corners and the number of said plurality of second corners are equal. The exhaust gas treatment device according to claim 7, wherein the number of said plurality of first corners differs from the number of said plurality of second corners. The exhaust gas treatment device according to claim 9, wherein the number of said plurality of second corners is greater than the number of said plurality of first corners. The exhaust gas treatment apparatus according to any one of claims 7 to 10, wherein the other end of each of the plurality of branch pipes is connected to each of the plurality of second corners on the side wall of the reaction tower. In the cross section of the branch pipe in the direction intersecting the extension direction of the branch pipe, the width of the cross section in the direction from the introduction side of the exhaust gas to the discharge side intersects the direction from the introduction side of the exhaust gas to the discharge side. 12. An exhaust gas treatment apparatus according to any one of claims 1 to 11, which is greater than the width of the cross section in a direction. 13. The exhaust gas treatment device according to claim 12, wherein a cross section of said branch pipe in a direction intersecting with the extending direction of said branch pipe is elliptical. The angle formed by the branch pipe connected to the second portion of the trunk pipe and the trunk pipe, the angle formed by the branch pipe and the trunk pipe in a direction intersecting the extending direction of the trunk pipe is , greater than 0 degrees and less than 90 degrees. comprising a plurality of trunk pipes,
When viewed in the direction from the discharge side of the exhaust gas to the introduction side, the shape of one main pipe in the plurality of main pipes is different from the shape of the other main pipes,
The exhaust gas treatment apparatus according to any one of claims 1 to 14.

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