Exhaust gas treatment equipment

Abstract

To provide an exhaust gas treatment device capable of favorably inhibiting discharge of liquid which has treated exhaust gas in a reactor, to the outside of the exhaust gas treatment device.SOLUTION: An exhaust gas treatment device comprises a reactor having an exhaust gas introduction port through which exhaust gas is introduced and a gas discharge port through which the exhaust gas is discharged, and supplied with liquid for treating the exhaust gas. The reactor has a first ejection part ejecting the liquid inside the reactor. The exhaust gas proceeds from the gas introduction port to the gas discharge port while circling the reactor inside in a circling direction. The liquid ejected from the first ejection part distributes into a shape having the major and minor axes in the cross section crossing with the ejection axis of the first ejection part. The first end part of an upstream side in the circling direction in the ejection face including the ejection axis of the first ejection part and the major axis, is disposed at an exhaust gas discharge port side of a second end part of a downstream side of the first end part.SELECTED DRAWING: Figure 8A

Description

[Technical field]

[0001] The present invention relates to an exhaust gas treatment device. [Background technology]

[0002] Patent Document 1 states that "by mounting the spray nozzle 4 facing upward, the absorbing liquid droplets sprayed from the spray nozzle 4 are sprayed slightly upward from the horizontal direction as in the conventional method" (abstract). Patent Documents 2 and 3 state that "guide vanes 6 are provided on the upper inner surface of the absorption tower 3 to impart a swirling force to the ascending exhaust gas" (abstract). Patent Document 4 states that "multiple nozzles are arranged so that the collecting agent sprayed from the nozzles creates a flow along the inner wall surface" (abstract). Patent Document 5 describes that "the jet direction of the nozzle 6 is directed upward from the horizontal" (abstract). [Prior art document] [Patent documents] [Patent Document 1] JP 2000-210532 A [Patent Document 2] Japanese Patent Application Laid-Open No. 11-151425 [Patent Document 3] Japanese Patent Application Laid-Open No. 11-151426 [Patent Document 4] JP 2007-289793 A [Patent Document 5] Japanese Patent Application Laid-Open No. 10-225615 Summary of the Invention [Problem to be solved by the invention]

[0003] In the exhaust gas treatment device, it is preferable to prevent the liquid obtained by treating the exhaust gas in the reaction tower from being discharged to the outside of the exhaust gas treatment device. [Means for solving the problem]

[0004] In a first aspect of the present invention, there is provided an exhaust gas treatment device. The exhaust gas treatment device includes a reaction tower having an exhaust gas inlet into which exhaust gas is introduced and an exhaust gas outlet from which exhaust gas is discharged, and being supplied with a liquid for treating the exhaust gas. The reaction tower further includes one or more first ejection parts for ejecting the liquid into the reaction tower. The exhaust gas advances in a direction from the exhaust gas inlet to the exhaust gas outlet while swirling in a predetermined swirling direction inside the reaction tower. The liquid ejected by the first ejection part is distributed in a shape having a major axis and a minor axis in a cross section intersecting with the injection axis of the first ejection part. A first end part of an injection surface including the injection axis and the major axis of the first ejection part, which is the first end part on the upstream side in the swirling direction, is disposed closer to the exhaust gas outlet in the direction from the exhaust gas inlet to the exhaust gas outlet than a second end part of the injection surface, which is the second end part on the downstream side in the swirling direction than the first end part. Exhaust gas treatment device.

[0005] The injection axis of the first injection part may form a predetermined angle with a direction perpendicular to a direction from the exhaust gas inlet to the exhaust gas outlet.

[0006] The injection surface may be inclined in the same direction from the first end to the second end with respect to the swirling direction with respect to the direction from the exhaust gas inlet to the exhaust gas outlet.

[0007] The reaction tower may further include a swirling section provided closer to the exhaust gas outlet than the first ejection section in the direction from the exhaust gas inlet to the exhaust gas outlet, and swirling the exhaust gas. The swirling section may have an inlet end into which the exhaust gas is introduced and an outlet end from which the exhaust gas is discharged. The exhaust gas may travel in a direction from the inlet end to the outlet end while swirling in a predetermined swirling direction inside the swirling section. The swirling section may include a wing section. A surface on the inlet end side of the wing section may intersect with a direction from the inlet end to the outlet end of the swirling section. A first angle formed by a surface on the inlet end side of the wing section and a direction from the inlet end to the outlet end of the swirling section may be variable.

[0008] The exhaust gas treatment device may further include an output control unit that controls the output of a power plant that emits exhaust gas, and an angle control unit that controls the first angle based on the output of the power plant controlled by the output control unit.

[0009] The swirling section may be provided so as to cover the entire inside of the reaction column when viewed in the direction from the discharge end to the introduction end.

[0010] The reaction tower may further include a liquid spraying part provided closer to the exhaust gas inlet than the first jetting part in the direction from the exhaust gas inlet to the exhaust gas outlet, and a second jetting part that jets liquid in the liquid spraying part into the reaction tower. The liquid jetted by the second jetting part may be distributed in a circular shape in a cross section intersecting with the jet axis of the second jetting part.

[0011] The particle size of the liquid jetted by the first jetting part may be equal to or larger than the particle size of the liquid jetted by the second jetting part.

[0012] The exhaust gas treatment device may further include a flow rate control unit that controls at least one of a first liquid flow rate, which is the flow rate of the liquid supplied to the first jetting unit, and a second liquid flow rate, which is the flow rate of the liquid supplied to the second jetting unit, and an exhaust gas flow rate measurement unit that measures the flow rate of the exhaust gas inside the reaction tower. The flow rate control unit may control at least one of the first liquid flow rate and the second liquid flow rate based on the flow rate of the exhaust gas measured by the exhaust gas flow rate measurement unit.

[0013] The flow rate control unit may stop the supply of liquid to the first jetting unit based on the flow rate of the exhaust gas measured by the exhaust gas flow rate measurement unit.

[0014] The flow rate control unit may control at least one of the first liquid flow rate and the second liquid flow rate based on the first angle controlled by the angle control unit.

[0015] The angle control unit may control the first angle based on the flow rate of the exhaust gas measured by the exhaust gas flow rate measurement unit.

[0016] The angle control section may control the first angle based on at least one of the first liquid flow rate and the second liquid flow rate controlled by the flow rate control section.

[0017] The exhaust gas treatment device may further include a flow rate control unit that controls at least one of a first liquid flow rate, which is the flow rate of the liquid supplied to the first jetting unit, and a second liquid flow rate, which is the flow rate of the liquid supplied to the second jetting unit. The flow rate control unit may control at least one of the first liquid flow rate and the second liquid flow rate based on the output of the power plant controlled by the output control unit.

[0018] The exhaust gas treatment device may further include an exhaust gas discharge pipe for discharging the exhaust gas, a liquid detection unit for detecting liquid in the exhaust gas discharge pipe, and a flow rate control unit for controlling a first liquid flow rate, which is a flow rate of the liquid supplied to the first jetting unit. The exhaust gas discharge pipe may have a swirling unit for swirling the exhaust gas. The exhaust gas discharge pipe may be connected to a reaction tower and may discharge the exhaust gas treated by the liquid in the reaction tower. The width of the exhaust gas discharge pipe in a direction intersecting the exhaust gas traveling direction in the exhaust gas discharge pipe may be smaller than the width of the reaction tower in a direction intersecting the exhaust gas traveling direction in the reaction tower. The liquid detection unit may detect the presence or absence of liquid downstream of the swirling unit in the exhaust gas traveling direction in the exhaust gas discharge pipe. The flow rate control unit may control the first liquid flow rate supplied to one first jetting unit and the first liquid flow rate supplied to another first jetting unit arranged closer to the exhaust gas outlet than the one first jetting unit. The flow rate control unit may control at least one of the first liquid flow rate supplied to one first jetting unit and the first liquid flow rate supplied to the other first jetting unit based on the presence or absence of liquid detected by the liquid detection unit.

[0019] The reaction tower may further include a liquid spraying part provided closer to the exhaust gas inlet than the first jetting part in the direction from the exhaust gas inlet to the exhaust gas outlet, and a second jetting part that jets liquid into the reaction tower in the liquid spraying part. The liquid jetted by the second jetting part may be distributed in a circular shape in a cross section intersecting with the jet axis of the second jetting part. The flow rate control part may further control a second liquid flow rate, which is the flow rate of the liquid supplied to the second jetting part, based on the presence or absence of the liquid detected by the liquid detection part.

[0020] The exhaust gas treatment device may further include an angle control unit. The swirling unit may have an inlet end into which the exhaust gas is introduced and an outlet end from which the exhaust gas is discharged. The exhaust gas may travel in a direction from the inlet end to the outlet end while swirling inside the swirling unit in a predetermined swirling direction. The swirling unit may include a wing unit. A surface of the wing unit on the inlet end side may intersect with a direction from the inlet end to the outlet end in the swirling unit. A first angle formed between a surface of the wing unit on the inlet end side and the direction from the inlet end to the outlet end may be variable. The angle control unit may control the first angle based on the presence or absence of liquid measured by the liquid detection unit.

[0021] The exhaust gas treatment device may further include an angle control unit. The swirl unit may have an inlet end into which the exhaust gas is introduced and an outlet end from which the exhaust gas is discharged. The exhaust gas may travel in a direction from the inlet end to the outlet end while swirling in a predetermined swirling direction inside the swirl unit. The swirl unit may include a wing unit. A surface on the inlet end side of the wing unit may intersect with a direction from the inlet end to the outlet end in the swirl unit. A first angle formed by a surface on the inlet end side of the wing unit and a direction from the inlet end to the outlet end may be variable. The liquid detection unit may detect the presence or absence of liquid at a first position of the exhaust gas discharge pipe, and at a second position of the exhaust gas discharge pipe, the second position being downstream of the first position in the traveling direction of the exhaust gas in the exhaust gas discharge pipe. When liquid is detected at the first position, the angle control unit may increase the first angle. When liquid is detected at the second position, the angle control unit may control the first angle to a maximum.

[0022] The exhaust gas treatment device may further include an exhaust gas discharge pipe for discharging the exhaust gas, a liquid detection unit for detecting the liquid in the exhaust gas discharge pipe, and a flow rate control unit for controlling a first liquid flow rate, which is a flow rate of the liquid supplied to the first ejection unit. The exhaust gas discharge pipe may have a swirling unit for swirling the exhaust gas. The exhaust gas discharge pipe may be connected to a reaction tower. The exhaust gas discharge pipe may discharge the exhaust gas treated by the liquid in the reaction tower. The width of the exhaust gas discharge pipe in a direction intersecting the exhaust gas traveling direction in the exhaust gas discharge pipe may be smaller than the width of the reaction tower in a direction intersecting the exhaust gas traveling direction in the reaction tower. The liquid detection unit may measure the amount of liquid downstream of the swirling unit in the exhaust gas traveling direction in the exhaust gas discharge pipe. The flow rate control unit may control the first liquid flow rate based on the amount of liquid measured by the liquid detection unit.

[0023] The reaction tower may further include a liquid spraying part provided closer to the exhaust gas inlet than the first jetting part in the direction from the exhaust gas inlet to the exhaust gas outlet, and a second jetting part that jets liquid into the reaction tower in the liquid spraying part. The liquid jetted by the second jetting part may be distributed in a circular shape in a cross section intersecting with the jet axis of the second jetting part. The flow rate control part may further control a second liquid flow rate, which is the flow rate of the liquid supplied to the second jetting part, based on the amount of liquid measured by the liquid detection part.

[0024] The exhaust gas treatment device may further include an angle control unit. The swirling unit may have an inlet end into which the exhaust gas is introduced and an outlet end from which the exhaust gas is discharged. The exhaust gas may travel in a direction from the inlet end to the outlet end while swirling inside the swirling unit in a predetermined swirling direction. The swirling unit may include a wing portion. A surface of the wing portion on the inlet end side may intersect with the traveling direction of the exhaust gas in the swirling unit. A first angle formed by a surface of the wing portion on the inlet end side and a direction from the inlet end to the outlet end may be variable. The angle control unit may control the first angle based on the amount of liquid measured by the liquid detection unit.

[0025] The exhaust gas treatment device may further include an angle control unit. The swirl unit may have an inlet end into which the exhaust gas is introduced and an outlet end from which the exhaust gas is discharged. The exhaust gas may travel in a direction from the inlet end to the outlet end while swirling in a predetermined swirling direction inside the swirl unit. The swirl unit may include a wing unit. A surface of the wing unit on the inlet end side may intersect with a direction from the inlet end to the outlet end in the swirl unit. A first angle formed by a surface of the wing unit on the inlet end side and a direction from the inlet end to the outlet end may be variable. The liquid detection unit may measure a first amount of liquid at a first position of the exhaust gas discharge pipe, and a second amount of liquid at a second position of the exhaust gas discharge pipe that is downstream of the first position in the traveling direction of the exhaust gas in the exhaust gas discharge pipe. If the first amount of liquid is less than a first threshold amount, the flow rate control unit may increase at least one of the first liquid flow rate and the second liquid flow rate. If the second amount of liquid is greater than or equal to a second predetermined threshold amount, the angle controller may increase the first angle.

[0026] The flow rate control unit may reduce at least one of the first liquid flow rate and the second liquid flow rate based on the flow rate of the exhaust gas measured by the exhaust gas flow rate measuring unit.

[0027] The reaction tower may have an exhaust gas outlet through which the exhaust gas is discharged. The flow rate control unit may reduce the first liquid flow rate so that the amount of liquid discharged from the exhaust gas outlet is less than a predetermined liquid amount.

[0028] The flow rate control unit may reduce at least one of the first liquid flow rate and the second liquid flow rate based on the amount of liquid measured by the liquid detection unit.

[0029] The flow rate control unit may stop the supply of liquid to at least one of the first jetting unit and the second jetting unit based on the amount of liquid measured by the liquid detection unit.

[0030] The above summary of the invention does not list all of the necessary features of the present invention. Also, subcombinations of these features may also be inventions. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is a diagram illustrating an example of an exhaust gas treatment device 100 according to an embodiment of the present invention. [Diagram 2] 2 is an enlarged view of a region including a first jetting portion 14 and a second jetting portion 24 in FIG. [Diagram 3] FIG. 3 is a diagram showing an example of the exhaust gas treatment device 100 shown in FIGS. 1 and 2 when viewed from a traveling direction E1. [Figure 4] 1 is a diagram showing an example of a region W from which a first jetting part 14 jets liquid 40. FIG. [Diagram 5] 2 is a diagram showing an example of a first jetting part 14 when viewed from the extending direction of the jetting axis of the first jetting part 14. FIG. [Figure 6] 1 is a diagram showing an example of a first ejection part 14 when viewed from the U-axis direction. FIG. [Figure 7] 1 is a diagram showing an example of a first ejection part 14 when viewed from the T-axis direction. [Figure 8A] 2 is a diagram showing an example of a first jetting part 14 connected to a branch pipe 13. FIG. [Figure 8B] 8B is a diagram showing an example of a branch pipe 13-7A and a first ejection part 14-7A in FIG. 8A when viewed parallel to the extending direction of the branch pipe 13-7A and in the direction from the trunk pipe 12 to the end EN. [Figure 8C] FIG. 8B is a diagram showing another example of the branch pipe 13-7A and the first ejection part 14-7A in FIG. 8A, viewed parallel to the extending direction of the branch pipe 13-7A and in the direction from the trunk pipe 12 to the end EN. [Figure 9] 13 is a diagram showing another example of the first ejection part 14 when viewed from the direction D. FIG. [Figure 10] 13 is a diagram showing another example of the first jetting part 14 connected to the branch pipe 13. FIG. [Figure 11] 2 is a diagram showing an example of a second jetting part 24 when viewed from the extending direction of the jetting axis of the second jetting part 24. FIG. [Figure 12] 11 is a diagram showing an example of a second ejection part 24 when viewed from the T-axis direction. FIG. [Figure 13] 2 is a perspective view showing an example of a swivel unit 80 in FIG. 1. [Figure 14] 14 is a diagram showing an example of the swivel section 80 shown in FIG. 1 and FIG. 13 when viewed from the traveling direction E2. FIG. [Figure 15] 15 is an example of a side view of the line G1-G2 shown in FIG. 14, viewed in the direction from G1 to G2. [Figure 16] FIG. 1 is a diagram showing an example of a block diagram of an exhaust gas treatment device 100 according to an embodiment of the present invention. [Figure 17] 16 is a diagram showing an example of the relationship between the output of a power unit 50 and a first angle η1 (see FIG. 15). FIG. [Figure 18] 11 is a diagram showing an example of the relationship between the output of a power unit 50 and a first liquid flow rate FL1. FIG. [Figure 19] 11 is a diagram showing an example of the relationship between the output of a power unit 50 and a second liquid flow rate FL2. FIG. [Figure 20] FIG. 2 is a diagram showing another example of the exhaust gas treatment device 100 according to an embodiment of the present invention. [Figure 21] 21 is a diagram showing an example of details of a recovery unit 51 shown in FIG. 20. FIG. [Figure 22] 22 is a diagram showing an example of an XZ cross section of a part of a collection section 51 shown in FIG. 21. FIG. [Diagram 23] 20. FIG. 21 is a flowchart showing an example of a method for controlling the first ejection part 114, the second ejection part 124, and the first angle η1 (see FIG. 15) in the exhaust gas treatment device 100 shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] The present invention will be described below through embodiments of the invention, but the following embodiments do not limit the scope of the invention according to the claims. Furthermore, not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0033] 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. The exhaust gas treatment device 100 may include an exhaust gas introduction pipe 32, a power unit 50, and a drain pipe 20.

[0034] The power unit 50 is, for example, an engine, a boiler, or the like. The power unit 50 discharges an exhaust gas 30. An exhaust gas introduction pipe 32 connects the power unit 50 and the reaction tower 10. The exhaust gas 30 is introduced into the reaction tower 10. In this example, the exhaust gas 30 discharged from the power unit 50 passes through the exhaust gas introduction pipe 32 and is then introduced into the reaction tower 10.

[0035] The exhaust gas 30 is introduced into the reaction tower 10. The reaction tower 10 is supplied with a liquid 40 for treating the exhaust gas 30. The liquid 40 supplied to the reaction tower 10 treats the exhaust gas 30 inside the reaction tower 10. The liquid 40 is, for example, seawater or an alkaline liquid. Treating the exhaust gas 30 refers to removing harmful substances contained in the exhaust gas 30. After treating the exhaust gas 30, the liquid 40 becomes a waste liquid 46. The exhaust gas 30 treated by the liquid 40 is discharged from the reaction tower 10. The reaction tower 10 may have an exhaust gas inlet 11 into which the exhaust gas 30 is introduced and an exhaust gas outlet 17 from which the exhaust gas 30 is discharged.

[0036] The reaction tower 10 of this example has a side wall 15, a bottom surface 16, a gas treatment section 18, and a liquid outlet 19. The reaction tower 10 of this example is cylindrical. In this example, the exhaust gas outlet 17 is disposed at a position facing the bottom surface 16 in a direction parallel to the central axis of the cylindrical reaction tower 10. In this example, the side wall 15 and the bottom surface 16 are the inner surface and the bottom surface of the cylindrical reaction tower 10, respectively. The exhaust gas inlet 11 may be provided in the side wall 15. In this example, the exhaust gas 30 is introduced into the gas treatment section 18 after passing through the exhaust gas inlet 11 from the exhaust gas introduction pipe 32.

[0037] The gas treatment section 18 is a space surrounded by the side wall 15, the bottom surface 16, and the exhaust gas discharge port 17. The gas treatment section 18 contacts the side wall 15, the bottom surface 16, and the exhaust gas discharge port 17. The gas treatment section 18 is a space that treats the exhaust gas 30 inside the reaction tower 10. The bottom surface 16 is a surface onto which the waste liquid 46 falls. The waste liquid 46 passes through the liquid discharge port 19 and is then discharged into the drain pipe 20.

[0038] The side wall 15 and the bottom surface 16 are formed of a material that is durable against the exhaust gas 30, as well as the liquid 40 and the drainage liquid 46. The material may be a combination of an iron material such as SS400 or S-TEN (registered trademark) with at least one of a coating agent and a paint agent, a copper alloy such as Nevar brass, an aluminum alloy such as aluminum brass, a nickel alloy such as cupronickel, or a stainless steel such as Hastelloy (registered trademark), SUS316L, SUS329J4L, or SUS312.

[0039] In this specification, technical matters may be described using orthogonal coordinate axes of the X-axis, Y-axis, and Z-axis. In this specification, a plane parallel to the bottom surface 16 of the reaction tower 10 is defined as the XY plane. In this specification, a direction connecting the bottom surface 16 and the exhaust gas discharge port 17 (a direction perpendicular to the bottom surface 16) is defined as the Z-axis direction. In this specification, a predetermined direction in the XY plane is defined as the X-axis direction, and a direction perpendicular to the X-axis in the XY plane is defined as the Y-axis direction.

[0040] In this specification, the X-axis direction refers to a direction parallel to the X-axis from one side to the other and from the other side to one side. That is, in this specification, the X-axis direction does not refer to either of the two directions parallel to the X-axis, but refers to a direction parallel to the X-axis. In this specification, the same applies to the Y-axis and Z-axis directions.

[0041] In this specification, a side view refers to a case where the exhaust gas treatment device 100 is viewed from a direction perpendicular to the Z axis (a predetermined direction in the XY plane). In this specification, a side view refers to a diagram viewed from the side.

[0042] The Z-axis direction may be parallel to the direction of gravity. When the Z-axis direction is parallel to the direction of gravity, the XY plane may be a horizontal plane. The Z-axis direction may be parallel to the horizontal direction. When the Z-axis direction is parallel to the horizontal direction, the XY plane may be parallel to the direction of gravity.

[0043] The reaction tower 10 has a first jetting part 14. The reaction tower 10 may have a plurality of first jetting parts 14. The first jetting part 14 jets the liquid 40 into the inside of the reaction tower 10 (gas processing part 18). The reaction tower 10 may have a plurality of trunk pipes 12 and a plurality of branch pipes 13. The liquid 40 is supplied to the trunk pipe 12 and the branch pipe 13. In this example, the first jetting part 14 is connected to the branch pipe 13, and the branch pipe 13 is connected to the trunk pipe 12.

[0044] The reaction tower 10 may have a second jetting part 24. The reaction tower 10 may have a plurality of second jetting parts 24. The second jetting part 24 jets the liquid 40 into the inside of the reaction tower 10 (gas processing part 18). The reaction tower 10 may have a plurality of trunk pipes 22 and a plurality of branch pipes 23. The liquid 40 is supplied to the trunk pipe 22 and the branch pipe 23. In this example, the second jetting part 24 is connected to the branch pipe 23, and the branch pipe 23 is connected to the trunk pipe 22.

[0045] The liquid 40 jetted by the first jetting part 14 is distributed in a shape having a major axis and a minor axis in a cross section intersecting with the jetting axis of the first jetting part 14. The liquid 40 jetted by the second jetting part 24 may be distributed in a circular shape in a cross section intersecting with the jetting axis of the second jetting part 24. The distribution shape of the liquid 40 jetted by the first jetting part 14 and the distribution shape of the liquid 40 jetted by the second jetting part 24 will be described later.

[0046] The exhaust gas treatment device 100 is, for example, a cyclone scrubber for ships. In the cyclone scrubber, the exhaust gas 30 introduced into the reaction tower 10 advances in a predetermined traveling direction while swirling in a predetermined swirling direction inside the reaction tower 10. In this example, the exhaust gas 30 advances in a traveling direction E1 while swirling in a swirling direction F1 (described later) inside the reaction tower 10. In this example, the traveling direction E1 is a direction from the exhaust gas inlet 11 to the exhaust gas discharge outlet 17 (Z-axis direction). In this example, the exhaust gas 30 swirls in the XY plane when viewed from the exhaust gas discharge outlet 17 to the bottom surface 16.

[0047] In this specification, the exhaust gas inlet 11 side in the traveling direction E1 of the exhaust gas 30 is referred to as the upstream side in the traveling direction E1. In this specification, the exhaust gas outlet 17 side in the traveling direction E1 is referred to as the downstream side in the traveling direction E1.

[0048] The reaction tower 10 may have a swirling section 80. The swirling section 80 swirls the exhaust gas 30. The swirling section 80 may be a so-called swirler. In this example, the swirling section 80 swirls the exhaust gas 30 in a swirling direction F2 (described later). The swirling section 80 may have an inlet end 102 to which the exhaust gas 30 is introduced and an outlet end 104 from which the exhaust gas 30 is discharged.

[0049] The exhaust gas 30 travels in a predetermined traveling direction while swirling in a predetermined swirling direction inside the swirling section 80. In this example, the exhaust gas 30 travels in a traveling direction E2 while swirling in a swirling direction F2 (described later) inside the swirling section 80. In this example, the traveling direction E2 is a direction from the inlet end 102 to the outlet end 104 (Z-axis direction). The swirling section 80 may be provided downstream of the first ejection section 14 in the traveling direction E1.

[0050] The introduction end 102 is the most upstream end of the exhaust gas 30 in the traveling direction E2. The introduction end 102 is an end on the inlet side of the exhaust gas 30 in the swirl section 80. The introduction end 102 may be a planar region including the most upstream end of the exhaust gas 30. The planar region may intersect with the traveling direction E2. The exhaust gas 30 may pass through the planar region.

[0051] The outlet end 104 is the most downstream end of the exhaust gas 30 in the traveling direction E2. The outlet end 104 is an end of the swirl section 80 on the outlet side of the exhaust gas 30. The outlet end 104 may be a planar region including the most downstream end of the exhaust gas 30. The planar region may intersect with the traveling direction E2. The exhaust gas 30 may pass through the planar region.

[0052] The traveling direction E1 of the exhaust gas 30 in the reaction tower 10 and the traveling direction E2 of the exhaust gas 30 in the swirling section 80 may or may not be parallel to each other. In this example, the traveling direction E1 and the traveling direction E2 are parallel to each other.

[0053] The exhaust gas treatment device 100 may include an exhaust gas flow rate measuring unit 98. The exhaust gas flow rate measuring unit 98 measures the flow rate of the exhaust gas 30 inside the reaction tower 10 (gas treatment unit 18). The exhaust gas treatment device 100 may include a gas flow rate sensor 99 that detects the flow rate of the exhaust gas 30 in the gas treatment unit 18. The gas flow rate sensor 99 may be provided in the exhaust gas inlet pipe 32. In this example, the exhaust gas flow rate measuring unit 98 measures the flow rate of the exhaust gas 30 inside the reaction tower 10 by the gas flow rate sensor 99. The exhaust gas flow rate measuring unit 98 will be described later.

[0054] The exhaust gas processing device 100 may include an output control unit 54. The output control unit 54 controls the output of the power unit 50. The output control unit 54 will be described later.

[0055] 2 is an enlarged view of a region including the first jetting part 14 and the second jetting part 24 in FIG. The reaction tower 10 may have a liquid spraying part 90. The liquid spraying part 90 may be provided closer to the exhaust gas inlet 11 (upstream side) in the direction from the exhaust gas inlet 11 to the exhaust gas discharge port 17 (traveling direction E1) than the first jetting part 14. The second jetting part 24 sprays the liquid 40 in the liquid spraying part 90.

[0056] The reaction tower 10 of this example has two trunk pipes 12 (trunk pipe 12-1 and trunk pipe 12-2). In this example, the trunk pipe 12-1 is the trunk pipe 12 provided on the exhaust gas inlet 11 side in the traveling direction E1. The trunk pipe 12-2 is the trunk pipe 12 provided on the exhaust gas outlet 17 side in the traveling direction E1.

[0057] The reaction tower 10 in this example includes branch pipes 13-1 to 13-8. In this example, the branch pipes 13-1 and 13-8 are the branch pipes 13 provided closest to the exhaust gas inlet 11 and closest to the exhaust gas outlet 17 in the traveling direction E1, respectively. In this example, the branch pipes 13-1, 13-3, 13-5, and 13-7 extend in the Y-axis direction, and the branch pipes 13-2, 13-4, 13-6, and 13-8 extend in the X-axis direction.

[0058] In this example, branch pipes 13-1 to 13-4 are connected to trunk pipe 12-1, and branch pipes 13-5 to 13-8 are connected to trunk pipe 12-2. Branch pipes 13-1, 13-3, 13-5, and 13-7 may be disposed on both sides of trunk pipe 12 in a direction parallel to the Y-axis. Branch pipes 13-2, 13-4, 13-6, and 13-8 may be disposed on both sides of trunk pipe 12 in a direction parallel to the X-axis.

[0059] Taking branch pipe 13-1 as an example, branch pipe 13-1A and branch pipe 13-1B are branch pipes 13-1 arranged on one side and the other side of trunk pipe 12-1, respectively, in a direction parallel to the Y axis. Branch pipe 13-1A and branch pipe 13-1B may be arranged to sandwich trunk pipe 12-1 in the direction parallel to the Y axis. Note that branch pipe 13-1A and branch pipe 13-3A are not shown in FIG. 2 because they are arranged at a position overlapping trunk pipe 12-1.

[0060] Taking branch pipe 13-2 as an example, branch pipe 13-2A ​​and branch pipe 13-2B are branch pipes 13-2 arranged on one side and the other side of trunk pipe 12-1, respectively, in a direction parallel to the X-axis. Branch pipe 13-2A ​​and branch pipe 13-2B may be arranged to sandwich trunk pipe 12-1 in the direction parallel to the X-axis.

[0061] The reaction tower 10 of this example includes a first jetting part 14-1 to a first jetting part 14-8. In this example, the first jetting part 14-1 and the first jetting part 14-8 are the first jetting parts 14 provided closest to the exhaust gas inlet 11 and closest to the exhaust gas outlet 17 in the traveling direction E1, respectively. The first jetting parts 14-1 to 14-8 of this example are connected to the branch pipes 13-1 to 13-8, respectively.

[0062] Taking the first jetting part 14-1 as an example, the first jetting part 14-1A and the first jetting part 14-1B are the first jetting parts 14-1 arranged on one side and the other side of the trunk pipe 12-1, respectively, in the direction parallel to the Y axis. The first jetting part 14-1A and the first jetting part 14-1B may be provided so as to sandwich the trunk pipe 12-1 in the direction parallel to the Y axis.

[0063] In addition, in Fig. 2, first jetting part 14-1A and first jetting part 14-3A are not shown because they are arranged at a position overlapping with trunk pipe 12-1. In Fig. 2, first jetting part 14-5A and first jetting part 14-7A are not shown because they are arranged at a position overlapping with trunk pipe 12-1.

[0064] Taking the first jetting part 14-2 as an example, the first jetting part 14-2A and the first jetting part 14-2B are the first jetting parts 14-2 arranged on one side and the other side of the trunk pipe 12-1, respectively, in the direction parallel to the X-axis. The first jetting part 14-2A and the first jetting part 14-2B may be provided so as to sandwich the trunk pipe 12-1 in the direction parallel to the X-axis.

[0065] The first jetting part 14 has an opening surface from which the liquid 40 is jetted. In FIG. 2, the opening surface is indicated by an "x" mark. In one branch pipe 13, the opening surfaces of the first jetting parts 14 arranged on one side and the other side of the trunk pipe 12 may point in one direction and the other direction forming a predetermined angle θ (described later) with the extension direction of the branch pipe 13. The angle θ may be 30 degrees or more and 90 degrees or less. The direction in which the opening surface points refers to the direction of the jet axis (described later) of the first jetting part 14.

[0066] The reaction tower 10 in this example includes branch pipes 23-1 to 23-n, where n is an integer of 2 or more. In this example, the branch pipes 23-1 and 23-n are the branch pipes 23 provided closest to the exhaust gas inlet 11 and closest to the exhaust gas outlet 17, respectively, in the traveling direction E1. In this example, the branch pipes 23-n (n is an odd number) extend in the Y-axis direction, and the branch pipes 23-n (n is an even number) extend in the X-axis direction.

[0067] Taking branch pipe 23-1 as an example, branch pipe 23-1A and branch pipe 23-1B are branch pipes 23-1 arranged on one side and the other side of trunk pipe 22, respectively, in a direction parallel to the Y axis. Branch pipe 23-1A and branch pipe 23-1B may be provided to sandwich trunk pipe 22 in the direction parallel to the Y axis. Note that branch pipe 23-1A and branch pipe 23-3A are not shown in FIG. 2 because they are arranged at positions overlapping trunk pipe 22.

[0068] Taking branch pipe 23-2 as an example, branch pipe 23-2A and branch pipe 23-2B are branch pipes 23-2 arranged on one side and the other side of trunk pipe 22, respectively, in a direction parallel to the X-axis. Branch pipe 23-2A and branch pipe 23-2B may be provided so as to sandwich trunk pipe 22 therebetween in the direction parallel to the X-axis.

[0069] The reaction tower 10 in this example includes second jetting parts 24-1 to 24-n, where n is an integer of 2 or more. In this example, the second jetting parts 24-2 and 24-n are second jetting parts 24 provided closest to the exhaust gas inlet 11 and closest to the exhaust gas outlet 17 in the traveling direction E1, respectively. The second jetting parts 24-1 to 24-n in this example are connected to the branch pipes 23-1 to 23-n, respectively.

[0070] Taking the second jetting portion 24-1 as an example, the second jetting portion 24-1A and the second jetting portion 24-1B are second jetting portions 24-1 arranged on one side and the other side of the trunk pipe 22, respectively, in a direction parallel to the Y axis. In the direction parallel to the Y axis, the second jetting portion 24-1A and the second jetting portion 24-1B may be provided so as to sandwich the trunk pipe 22. Note that in FIG. 2, the second jetting portions 24-1A to 24-(n-1)A are not shown because they are arranged at positions overlapping with the trunk pipe 22.

[0071] Taking the second jetting portion 24-2 as an example, the second jetting portion 24-2A and the second jetting portion 24-2B are second jetting portions 24-2 arranged on one side and the other side of the trunk pipe 22, respectively, in a direction parallel to the X-axis. The second jetting portion 24-2A and the second jetting portion 24-2B may be provided so as to sandwich the trunk pipe 22 in the direction parallel to the X-axis.

[0072] The second jetting part 24 has an opening surface from which the liquid 40 is jetted. In Fig. 2, the opening surface is indicated by an "x" mark. In one branch pipe 23, the opening surfaces of the second jetting parts 24 arranged on one side and the other side of the trunk pipe 22 may point in one direction and the other direction forming a predetermined angle θ (described later) with the extension direction of the branch pipe 23. The angle θ may be 30° or more and 70° or less. The direction in which the opening surface points refers to the direction of the jet axis (described later) of the second jetting part 24.

[0073] The exhaust gas treatment device 100 may include a pump 60 and a flow rate control unit 70. The pump 60 supplies the liquid 40 to the reaction tower 10. 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.

[0074] The flow rate of the liquid 40 supplied to the first jetting part 14 is defined as a first liquid flow rate FL1. The flow rate of the liquid 40 supplied to the second jetting part 24 is defined as a second liquid flow rate FL2. The first liquid flow rate FL1 may be the mass or volume of the liquid 40 supplied to the first jetting part 14 per unit time. The second liquid flow rate FL2 may be the mass or volume of the liquid 40 supplied to the second jetting part 24 per unit time.

[0075] The flow rate control unit 70 may control at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2. In this example, the flow rate control unit 70 controls at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2 using a valve 72. The flow rate control unit 70 in this example includes three valves 72 (valve 72-1, valve 72-2, and valve 72-3).

[0076] The flow rate control unit 70 in this example controls the flow rates of the liquid 40 supplied to the trunk pipes 12-1 and 12-2, respectively, by means of the valves 72-2 and 72-3. The liquid 40 supplied to the trunk pipe 12 passes through the branch pipe 13, and is then sprayed from the first spray unit 14 into the inside of the reaction tower 10 (gas treatment unit 18). In this example, the flow rate control unit 70 controls the flow rate of the liquid 40 supplied to the trunk pipe 12, thereby controlling the first liquid flow rate FL1.

[0077] The flow rate control unit 70 of this example uses the valve 72-1 to control the flow rate of the liquid 40 supplied to the trunk pipe 22. The liquid 40 supplied to the trunk pipe 22 passes through the branch pipe 23, and then is sprayed from the second spray unit 24 into the inside of the reaction tower 10 (gas treatment unit 18). In this example, the flow rate control unit 70 controls the flow rate of the liquid 40 supplied to the trunk pipe 22, thereby controlling the second liquid flow rate FL2.

[0078] As described above, the liquid 40 is, for example, seawater or an alkaline liquid. When the liquid 40 is an alkaline liquid, the liquid 40 may be an alkaline liquid to which at least one of sodium hydroxide (NaOH), sodium carbonate (Na2CO3), sodium bicarbonate (NaHCO3), magnesium oxide (MgO), and magnesium hydroxide (Mg(OH)2) is added.

[0079] Exhaust gas 30 contains sulfur oxides (SO x ) and other harmful substances. x ) is, for example, sulfurous acid gas (SO2). When the liquid 40 is an aqueous solution of sodium hydroxide (NaOH), the reaction between the sulfurous acid gas (SO2) and sodium hydroxide (NaOH) contained in the exhaust gas 30 is represented by the following chemical formula 1. [Chemical formula 1] SO2+Na + +OH - →Na + +HSO3 -

[0080] As shown in chemical formula 1, sulfurous acid gas (SO2) undergoes a chemical reaction to produce hydrogen sulfite ions (HSO3 - ) Liquid 40 becomes hydrogen sulfite ions (HSO3 - The waste liquid 46 may be discharged from the drain pipe 20 to the outside of the exhaust gas treatment device 100.

[0081] The flow rate control unit 70 may control the first liquid flow rate FL1 based on at least one of the flow rate of the exhaust gas 30 in the swirling unit 80 and the flow rate of the exhaust gas 30 in the liquid spraying unit 90, both measured by the exhaust gas flow rate measuring unit 98. The control of the first liquid flow rate FL1 based on the flow rate of the exhaust gas 30 will be described later.

[0082] Fig. 3 is a diagram showing an example of the exhaust gas treatment device 100 shown in Fig. 1 and Fig. 2 when viewed from the traveling direction E1. In Fig. 3, the power unit 50, the pump 60, the flow rate control unit 70, the swirl unit 80, and the exhaust gas discharge port 17 are omitted.

[0083] Inside the reaction tower 10, trunk pipes 12-1, 12-2, and 22 are provided. The trunk pipes 12-1, 12-2, and 22 may be cylindrical with a central axis parallel to the Z axis. In the XY plane, the positions of the central axes of the trunk pipes 12-1, 12-2, and 22 may coincide with the position of the central axis of the reaction tower 10. That is, the trunk pipes 12-1, 12-2, 22, and 10 may be arranged concentrically as viewed from the traveling direction E1. In FIG. 3, the position of the central axis of the reaction tower 10 is indicated by position C1. The traveling direction E1 may be parallel to the central axis of the reaction tower 10. In this example, the trunk pipe 12-1 is arranged below the trunk pipe 12-2, and the trunk pipe 22 is arranged below the trunk pipe 12-1.

[0084] In the XY plane, the cross-sectional area of ​​the trunk pipe 12 on the exhaust gas inlet 11 side (see FIG. 1) may be larger than the cross-sectional area of ​​the trunk pipe 12 on the exhaust gas outlet 17 side (see FIG. 1). In the XY plane, the cross-sectional area of ​​the trunk pipe 22 may be larger than the cross-sectional area of ​​the trunk pipe 12.

[0085] The first jetting part 14 and the second jetting part 24 jet the liquid 40 into the inside of the reaction tower 10. However, in FIG. 3, the second jetting part 24 is disposed at a position overlapping with the first jetting part 14, and therefore is not shown.

[0086] The first jetting part 14 may jet the liquid 40 in a direction that forms a predetermined angle θ with the extension direction of the branch pipe 13. The second jetting part 24 may jet the liquid 40 in a direction that forms a predetermined angle θ with the extension direction of the branch pipe 23. The angle θ is an angle between an injection axis (described later) of the first jetting part 14 and the extension direction of the branch pipe 13, and is an angle between an injection axis (described later) of the second jetting part 24 and the extension direction of the branch pipe 23. In Fig. 3, the directions of the liquid 40 jetted from the first jetting part 14-7 and the first jetting part 14-8 to the gas processing part 18 are indicated by dashed arrows.

[0087] In this example, the direction of the liquid 40 jetted from the first jetting part 14-7A is one direction in the direction that forms an angle θ with the extension direction of the branch pipe 13-17, and the direction of the liquid 40 jetted from the first jetting part 14-7B is the other direction in the direction that forms an angle θ with the extension direction of the branch pipe 13-7. The direction of the liquid 40 jetted from the first jetting part 14-1A, the first jetting part 14-3A, the first jetting part 14-5A, and the second jetting part 24-1A to the second jetting part 24-(n-1)A may also be the one direction. The direction of the liquid 40 jetted from the first jetting part 14-1B, the first jetting part 14-3B, the first jetting part 14-5B, and the second jetting part 24-1B to the second jetting part 24-(n-1)B may also be the other direction.

[0088] In this example, the direction of the liquid 40 ejected from the first ejection part 14-8A is one direction in the direction that forms an angle θ with the extension direction of the branch pipe 13-8, and the direction of the liquid 40 ejected from the first ejection part 14-8B is the other direction in the direction that forms an angle θ with the extension direction of the branch pipe 13-8. The direction of the liquid 40 ejected from the first ejection part 14-2A, the first ejection part 14-4A, the first ejection part 14-6A, and the second ejection part 24-2A to the second ejection part 24-nA may also be the one direction. The direction of the liquid 40 ejected from the first ejection part 14-2B, the first ejection part 14-4B, the first ejection part 14-6B, and the second ejection part 24-2B to the second ejection part 24-nB may also be the other direction.

[0089] When viewed from the traveling direction E1, the exhaust gas introduction pipe 32 may be provided at a position where an extension line in the extension direction of the exhaust gas introduction pipe 32 does not overlap with the center position C1 of the reaction tower 10. The extension direction of the exhaust gas introduction pipe 32 refers to the traveling direction of the exhaust gas 30 passing through the exhaust gas inlet 11. By providing the exhaust gas introduction pipe 32 at the above-mentioned position, the exhaust gas 30 travels from the exhaust gas inlet 11 to the exhaust gas discharge outlet 17 while swirling in a spiral (cyclone-like) shape in the gas treatment unit 18. In this example, the exhaust gas 30 swirls clockwise in the gas treatment unit 18 when viewed from the traveling direction E1. The swirling direction of the exhaust gas 30 is defined as a swirling direction F1.

[0090] Fig. 4 is a diagram showing an example of an area W from which the first jetting part 14 jets the liquid 40. Fig. 4 is a diagram showing the area W as viewed from the traveling direction E1. In Fig. 4, the area W is shown by hatching. In Fig. 4, the branch pipe 13-8, the first jetting part 14-8, the trunk pipe 12-1 and the trunk pipe 22 shown in Fig. 3 are omitted.

[0091] 4, a first end EW1 and a second end EW2 of the injection surface Sf (described later) of the first ejection part 14-7A are shown. The first end EW1 is an end on the upstream side in the swirling direction F1 (see FIG. 3). The second end EW2 is an end on the downstream side of the first end EW1 in the swirling direction F1. In FIG. 4, the first end EW1 and the second end EW2 may be intersections between the outer edge (thick straight portion in FIG. 4) of the inside of the reaction tower 10 in the region W and the side wall 15.

[0092] 5 is a diagram showing an example of the first jetting part 14 when viewed from the extension direction of the jetting axis of the first jetting part 14. The extension direction of the jetting axis of the first jetting part 14 is direction D. The first jetting part 14 of this example jets liquid 40 in a range that forms an angle θ with direction D when viewed from the traveling direction E1.

[0093] The first jetting part 14 in this example has a jetting surface 36 and a groove 34. In this example, the jetting surface 36 is provided with a jetting opening 38. The first jetting part 14 jets liquid 40 from the jetting opening 38. The central axis of the jetting opening 38 is defined as a jetting axis a. The direction D is the extension direction of the jetting axis a.

[0094] In this specification, technical matters may be explained using orthogonal coordinate axes of S, T, and U. In this specification, the extension direction of the ejection axis a and the direction in which the liquid 40 is ejected from the ejection surface 36 is defined as the S axis, and the plane perpendicular to the S axis is defined as the UT plane. The ejection surface 36 is parallel to the UT plane. Two axes that are orthogonal to each other in the UT plane are defined as the U axis and the T axis.

[0095] In Fig. 5, the outer edge of region W is indicated by a roughly dashed line. The dashed line is the outer edge of region W at a position spaced a predetermined distance in the S-axis direction from the ejection surface 36. The shape of region W has a major axis A1 and a minor axis A2. In the example of Fig. 5, major axis A1 extends in a direction parallel to the T-axis, and minor axis A2 extends in a direction parallel to the U-axis. The liquid 40 jetted by the first jetting part 14 is distributed in a shape having a major axis and a minor axis in a cross section intersecting with the jetting axis of the first jetting part 14. In this example, the liquid 40 is distributed in a shape having a major axis A1 and a minor axis A2 in a UT cross section perpendicular to the jetting axis a.

[0096] The directions of the major axis A1 and the minor axis A2 in the UT plane may be variable by the groove 34. By rotating the groove 34 by a predetermined angle in the UT plane around the injection axis a as the central axis, the directions of the major axis A1 and the minor axis A2 in the UT plane may be set to predetermined directions.

[0097] The distribution of liquid 40 shown in Fig. 5 may be measured when the spray pressure of liquid 40 jetted by first jetting part 14 is in the range of 0.05 MPa or more and 0.5 MPa or less. The distribution of liquid 40 shown in Fig. 5 may be measured at the midpoint of the distance from jetting part 14-7A to side wall 15 in direction D in Fig. 4. The distance from jetting part 14-7A to the midpoint is, for example, 1.0 m.

[0098] Fig. 6 is a diagram showing an example of the first jetting part 14 when viewed from the U-axis direction. In Fig. 6, the range of region W is indicated by a double-headed arrow. The first jetting part 14 of this example jets liquid 40 in a range that forms an angle θ with the direction D when viewed from the U-axis direction.

[0099] The first jetting part 14 may have a back surface 37. The back surface 37 may be parallel to the jetting surface 36. The liquid 40 may be supplied to the first jetting part 14 from a direction intersecting the back surface 37 (the S-axis direction in this example).

[0100] Fig. 7 is a diagram showing an example of the first jetting part 14 when viewed from the T-axis direction. In Fig. 7, the range of region W is indicated by a double-headed arrow. The first jetting part 14 of this example jets liquid 40 in a range that forms an angle θ' with direction D when viewed from the T-axis direction. The angle θ' is smaller than the angle θ.

[0101] Fig. 8A is a diagram showing an example of a first jetting part 14 connected to a branch pipe 13. Fig. 8A will be described using the first jetting part 14-7A and branch pipe 13-7A in Fig. 4 as an example. Fig. 8A shows the first jetting part 14 as seen from the same side as Fig. 5 in the S-axis direction. In this example, the back surface 37 of the first jetting part 14-7A is connected to the branch pipe 13-7A.

[0102] Branch pipe 13-7A extends in the XY plane. In Fig. 8A, the extension direction of branch pipe 13-7A is indicated by a dashed line. The end of branch pipe 13-7A on the opposite side to trunk pipe 12 in the extension direction is referred to as end EN.

[0103] The injection surface including the injection axis a and the long axis A1 of the first injection part 14 is defined as the injection surface Sf. In this example, the injection axis a extends in a direction perpendicular to the direction from the exhaust gas inlet 11 to the exhaust gas outlet 17 (in this example, the Z-axis direction) (in this example, a direction in the XY plane (see Figs. 1 and 2)). The injection surface Sf is parallel to the ST plane. In this example, the first injection part 14-7A forms a predetermined angle φ with the extension direction of the branch pipe 13-7A. The first injection part 14-7A in this example is connected to the branch pipe 13-7A in a state rotated by an angle φ about the injection axis a from a state in which the injection surface Sf and the extension direction of the branch pipe 13-7A are parallel to each other. The angle φ may be set by the groove 34.

[0104] The upstream end of the injection surface Sf in the swirling direction F1 of the exhaust gas 30 is defined as the first end EW1. The end of the injection surface Sf in the swirling direction F1 that is downstream of the first end EW1 is defined as the second end EW2. The first end EW1 is disposed closer to the exhaust gas outlet 17 (downstream) in the direction from the exhaust gas inlet 11 to the exhaust gas outlet 17 (traveling direction E1 of the exhaust gas 30) than the second end EW2. Therefore, the liquid 40 ejected by the first ejection part 14 is likely to promote the flow of the exhaust gas 30 toward the side wall 15 side rather than the trunk pipe 12 side as viewed from the traveling direction E1. When the central axis of the reaction tower 10 is disposed parallel to the vertical direction, the first end EW1 is disposed above the second end EW2.

[0105] The contact area between the liquid 40 and the exhaust gas 30 is more likely to increase as the particle size of the liquid 40 decreases. x In order to remove harmful substances such as toxic substances, it is desirable that the liquid 40 ejected from the first ejection part 14 is in a mist form. When the liquid 40 is in a mist form, the liquid 40 ejected into the exhaust gas 30 is entrained in the exhaust gas 30 and tends to move in the traveling direction E1 while swirling in the swirling direction F1. Therefore, the liquid 40 tends to move in the direction toward the exhaust gas outlet 17.

[0106] When a part of the liquid 40 advances in the direction toward the exhaust gas outlet 17, the liquid 40 may be entrained by the exhaust gas 30 and discharged to the outside of the exhaust gas treatment device 100. The liquid 40 may convert hydrogen sulfite ions (HSO3 - ) may be present. Therefore, hydrogen sulfite ions (HSO3 - When the liquid 40 containing . ) is discharged to the outside of the exhaust gas treatment device 100, the liquid 40 may corrode steel materials and the like on the outside of the exhaust gas treatment device 100.

[0107] In the exhaust gas treatment device 100 of this embodiment, the liquid 40 sprayed by the first spraying part 14 tends to promote the flow of the exhaust gas 30 to the side wall 15 side as viewed from the traveling direction E1. As viewed from the traveling direction E1, the centrifugal force applied to the mist-like liquid 40 flowing on the side wall 15 side tends to be larger than the centrifugal force applied to the mist-like liquid 40 flowing on the main pipe 12 side. Therefore, the liquid 40 entrained in the exhaust gas 30 tends to accumulate on the side wall 15 (see FIGS. 1 and 2) due to the centrifugal force downstream of the first spraying part 14 in the traveling direction E1. Therefore, the liquid 40 tends to form a liquid film on the side wall 15. Therefore, the liquid 40 tends to be suppressed from being discharged to the outside of the exhaust gas treatment device 100.

[0108] Sulfur oxides (SO x In order to remove harmful substances such as pollutants, it is desirable that the liquid 40 sprayed from the second spraying part 24 (see Figs. 1 and 2) is also in a mist form. The particle size of the liquid 40 sprayed by the first spraying part 14 is defined as particle size R1. The particle size of the liquid 40 sprayed by the second spraying part 24 is defined as particle size R2. Particle size R1 may be equal to or greater than particle size R2.

[0109] The larger the particle size of the liquid 40, the greater the centrifugal force applied to the liquid 40 when the liquid 40 is entrained by the exhaust gas 30 swirling in the swirling direction F1. Therefore, the larger the particle size of the liquid 40, the more difficult it is for the liquid 40 to be discharged to the outside of the exhaust gas treatment device 100 together with the exhaust gas 30. Since the first jetting part 14 is closer to the exhaust gas discharge port 17 than the second jetting part 24, by having the particle size R1 be equal to or larger than the particle size R2, the liquid 40 entrained by the exhaust gas 30 is more difficult to be discharged to the outside of the exhaust gas treatment device 100 together with the exhaust gas 30 than when the particle size R1 is less than the particle size R2.

[0110] The particle size R1 may be 1000 μm or more and 2000 μm or less. The particle size R1 is, for example, 1500 μm. The particle size R2 may be 500 μm or more and 1500 μm or less. The particle size R2 is, for example, 1000 μm.

[0111] The ejection surface Sf may be inclined in the same direction with respect to the traveling direction E1 from the first end EW1 to the second end EW2 in the swirling direction F1. The direction of the ejection surface Sf is the direction Sh. The direction Sh of the ejection surface Sf refers to the normal direction of the ejection surface Sf. In FIG. 8A, the direction Sh is indicated by a thick arrow. The ejection surface Sf being inclined in the same direction with respect to the traveling direction E1 from the first end EW1 to the second end EW2 refers to a state in which the direction Sh is inclined to one side of the first end EW1 and the second end EW2 from the first end EW1 to the second end EW2 with respect to the traveling direction E1. In this example, the direction Sh is inclined to the side of the second end EW2 from the first end EW1 to the second end EW2 with respect to the traveling direction E1. Since the injection surface Sf is inclined in the same direction with respect to the traveling direction E1 in the swirling direction F1 from the first end EW1 to the second end EW2, the liquid 40 ejected by the first ejection section 14 tends to promote the swirling of the exhaust gas 30 in the swirling direction F1 throughout the entire area from the first end EW1 to the second end EW2.

[0112] The angle between the direction Sh and the traveling direction E1 is defined as angle φ'. Since the ejection surface Sf in this example is a plane, the angle φ' is constant from the first end EW1 to the second end EW2. In this example, the angle φ' is equal to the angle φ.

[0113] The ejection surface Sf may be a curved surface. The ejection surface Sf may be a curved surface that is inclined in the same direction with respect to the traveling direction E1 from the first end EW1 to the second end EW2 in the turning direction F1. The ejection surface Sf may be a curved surface that is convex in the U-axis direction when viewed from the S-axis direction.

[0114] Fig. 8B is a diagram showing an example of the branch pipe 13-7A and the first ejection part 14-7A in Fig. 8A when viewed parallel to the extension direction of the branch pipe 13-7A and in the direction from the trunk pipe 12 to the end EN. In Fig. 8B, the direction in the XY plane (see Figs. 1 and 2) is shown by a rough dashed line. In this example, the direction in the XY plane and the S-axis direction are parallel. In this example, the ejection axis a (see Fig. 8A) of the first ejection part 14-7A is parallel to the direction (direction in the XY plane) perpendicular to the direction from the exhaust gas inlet 11 to the exhaust gas outlet 17 (traveling direction E1).

[0115] Fig. 8C is a diagram showing another example of the branch pipe 13-7A and first jetting part 14-7A in Fig. 8A when viewed parallel to the extension direction of the branch pipe 13-7A and in the direction from the trunk pipe 12 to the end EN. In Fig. 8C, directions in the XY plane (see Figs. 1 and 2) are shown by rough dashed lines, and directions parallel to direction D are shown by dashed lines. This example is an example in which the branch pipe 13-7A and first jetting part 14-7A in the example of Fig. 8B are rotated counterclockwise by angle α around the central axis in the extension direction of the branch pipe 13-7A.

[0116] In this example, the injection axis a (see FIG. 8A) of the first ejection part 14-7A forms a predetermined angle α with a direction (direction in the XY plane) perpendicular to the direction (traveling direction E1) from the exhaust gas inlet 11 to the exhaust gas exhaust outlet 17. The injection axis a may form an angle α with the direction in the XY plane toward the exhaust gas exhaust outlet 17. In this example, the direction D has a component parallel to the traveling direction E1 of the exhaust gas 30.

[0117] The angle α may be an acute angle. The angle α may be greater than 0° and less than 60°. The angle α may be greater than or equal to 15° and less than or equal to 45°. The angle α is, for example, 30°.

[0118] In the first jetting part 14 of this example, the first end EW1 is disposed closer to the exhaust gas discharge port 17 (downstream) than the second end EW2 in the direction from the exhaust gas inlet 11 to the exhaust gas discharge port 17 (traveling direction E1 of the exhaust gas 30), and the direction D has a component parallel to the traveling direction E1 of the exhaust gas 30. Therefore, the liquid 40 jetted by the first jetting part 14 promotes the flow of the exhaust gas 30 toward the side wall 15 side rather than the trunk pipe 12 side when viewed from the traveling direction E1, and is more likely to promote the flow of the exhaust gas 30 in the direction from the exhaust gas inlet 11 to the exhaust gas discharge port 17 when viewed from a direction perpendicular to the traveling direction E1.

[0119] Fig. 9 is a diagram showing another example of the first jetting part 14 when viewed from the direction D. In the first jetting part 14 of this example, the shape of the jetting opening 38 is different from the example shown in Fig. 5. The jetting opening 38 of this example is circular.

[0120] The first jetting part 14 in this example has an upper surface 39 and a lower surface 31. The liquid 40 may be supplied to the first jetting part 14 from a direction intersecting the lower surface 31 (the U-axis direction in this example).

[0121] The first jetting part 14 of this example is provided with a jetting opening 38-1 and a jetting opening 38-2. In FIG. 9, the jetting opening 38-1 is shown by hatching. The jetting opening 38-1 may be closed. The jetting surface 36 may be provided with a lid at the position of the jetting opening 38-1 to prevent the jetting of the liquid 40. In the first jetting part 14 of this example, the liquid 40 is jetted from the jetting opening 38-2, and is not jetted from the jetting opening 38-1.

[0122] The central angle of the ejection opening 38-2 in a direction parallel to the ejection surface 36 is defined as angle ψ. The angle ψ may be 90° or less. The ejection opening 38-2 may be disposed on the upper surface 39 side of the ejection axis a. In FIG. 9, the outer edge of the region W is indicated by a rough dashed line. The region W' indicated by the dashed line is a region from which the first ejection part 14 does not eject the liquid 40.

[0123] Fig. 10 is a diagram showing another example of the first jetting part 14 connected to the branch pipe 13. In Fig. 10, similar to Fig. 8A, the first jetting part 14-7A and the branch pipe 13-7A in Fig. 4 will be described as an example. Fig. 10 shows the first jetting part 14 as seen from the same side as Fig. 9 in the S-axis direction. In this example, the lower surface 31 of the first jetting part 14-7A is connected to the branch pipe 13-7A.

[0124] The liquid 40 jetted by the first jetting part 14 is distributed in a sector shape with a central angle of 90° or less in a cross section intersecting with the jetting axis a of the first jetting part 14. In this example, the liquid 40 is distributed in a sector shape with a central angle of 90° in a UT cross section perpendicular to the jetting axis a.

[0125] In this example as well, the first end EW1 is disposed closer to the exhaust gas outlet 17 (downstream side) in the direction from the exhaust gas inlet 11 to the exhaust gas outlet 17 (traveling direction E1 of the exhaust gas 30) than the second end EW2. Therefore, the liquid 40 ejected by the first ejection part 14 is more likely to promote the flow of the exhaust gas 30 toward the side wall 15 side rather than the trunk pipe 12 side as viewed from the traveling direction E1. In this example as well, the ejection surface Sf is inclined in the same direction with respect to the traveling direction E1 from the first end EW1 to the second end EW2 in the swirling direction F1. Therefore, the liquid 40 ejected by the first ejection part 14 is more likely to promote the swirling of the exhaust gas 30 in the swirling direction F1 throughout the entirety from the first end EW1 to the second end EW2.

[0126] 11 is a diagram showing an example of the second jetting part 24 when viewed from the extension direction of the jetting axis of the second jetting part 24. The extension direction of the jetting axis of the second jetting part 24 is direction G. The second jetting part 24 of this example jets liquid 40 in a range that forms an angle θ with direction G when viewed from the traveling direction E1.

[0127] The second jetting part 24 in this example has an upper surface 139, a lower surface 131, and a jetting surface 136. The liquid 40 may be supplied to the second jetting part 24 from a direction intersecting the lower surface 131 (the U-axis direction in this example). The lower surface 131 may be connected to the branch pipe 13.

[0128] In this example, the ejection surface 136 is provided with an ejection opening 138. The second ejection section 24 ejects the liquid 40 from the ejection opening 138. The central axis of the ejection opening 138 is the ejection axis b. The direction G is the extension direction of the ejection axis b. Note that the direction G and the direction D may face the same direction or may face different directions.

[0129] The region from which the second jetting part 24 jets the liquid 40 is referred to as region V. In Fig. 11, the outer edge of region V is indicated by a roughly dashed line. The dashed line is the outer edge of region V at a position spaced a predetermined distance from the jetting surface 136 in the S-axis direction.

[0130] The liquid 40 jetted by the second jetting part 24 may be distributed in a circular shape in a cross section intersecting with the jetting axis of the second jetting part 24. In this example, the liquid 40 is distributed in a circular shape in a UT cross section perpendicular to the jetting axis b.

[0131] 12 is a diagram showing an example of the second jetting part 24 when viewed from the T-axis direction. In FIG. 12, the range of region V is indicated by a double-headed arrow. The second jetting part 24 of this example jets liquid 40 in a range that forms an angle θ with the direction G when viewed from the T-axis direction. The shape of the second jetting part 24 when viewed from the U-axis direction may be the same as the shape of the first jetting part 14 in FIG. 6.

[0132] Fig. 13 is a perspective view showing an example of the swirl section 80 in Fig. 1. The swirl section 80 of this example is provided downstream of the first jetting section 14 (see Fig. 1) in the traveling direction E1 of the exhaust gas 30 inside the reaction tower 10. The swirl section 80 of this example is provided between the first jetting section 14 (see Fig. 1) and the exhaust gas discharge port 17 in the traveling direction E1.

[0133] The swirling section 80 swirls the exhaust gas 30 in a predetermined swirling direction (swirling direction F2 described below) when viewed in a direction from the outlet end 104 to the inlet end 102 (when viewed from the traveling direction E2 of the exhaust gas 30). The exhaust gas 30 swirled by the swirling section 80 may swirl around a predetermined central axis 106. In FIG. 13, this central axis 106 is indicated by a dashed line.

[0134] When viewed from the traveling direction E2, the central axis 106 may or may not be parallel to the central axis of the cylindrical reaction tower 10. In this example, the central axis 106 is parallel to the central axis of the reaction tower 10. The traveling direction E2 may be parallel to the central axis 106.

[0135] The position of the central axis 106 when viewed from the traveling direction E2 may or may not coincide with the position (position C1) of the central axis of the reaction tower 10 when viewed from the traveling direction E1 (see FIG. 1). In this example, the position of the central axis 106 when viewed from the traveling direction E2 coincides with the position C1 of the central axis of the reaction tower when viewed from the traveling direction E1.

[0136] The swiveling section 80 of this example includes a support pillar 81 and a wing section 82. The support pillar 81 may be disposed at the position of the central axis 106 when viewed from the traveling direction E2. The support pillar 81 may be cylindrical with a central axis parallel to the central axis 106. When viewed from the traveling direction E2, the position of the central axis of the cylindrical support pillar 81 may coincide with the position of the central axis 106.

[0137] Wing 82 may be connected to support 81. Swivel portion 80 may have a plurality of wings 82. Swivel portion 80 in this example has eight wings 82 (wing 82-1 to wing 82-8).

[0138] Wing portion 82 may be plate-shaped having a front surface 83 and a back surface 84. In this example, front surface 83 of wing portion 82 is a surface visible when viewed from traveling direction E1, and back surface 84 of wing portion 82 is a surface visible when viewed from the opposite direction to traveling direction E1. In this example, front surface 83 is the surface of wing portion 82 on the outlet end 104 side, and back surface 84 is the surface of wing portion 82 on the introduction end 102 side. Wing portions 82-1 to 82-8 in this example have front surfaces 83-1 to 83-8, respectively. Wing portions 82-1 to 82-8 in this example have back surfaces 84-1 to 84-8, respectively.

[0139] The exhaust gas 30 introduced into the swirl section 80 passes through the inside of the swirl section 80, and is then discharged from the swirl section 80. In this example, the exhaust gas 30 passes between the back surface 84 of one blade section 82 and the front surface 83 of the other blade section 82 adjacent to the first blade section 82. Taking blade section 82-3 and blade section 82-4 as an example, the exhaust gas 30 passes between the back surface 84-4 of blade section 82-4 and the front surface 83-3 of blade section 82-3. In FIG. 13, the flow path of the exhaust gas 30 is indicated by a thick arrow.

[0140] The swirl section 80 may increase the velocity of the exhaust gas 30 introduced into the swirl section 80. The velocity of the exhaust gas 30 before being introduced into the swirl section 80 is velocity V1. The velocity of the exhaust gas 30 after being discharged from the swirl section 80 is velocity V2. Velocity V2 may be greater than velocity V1. The swirl section 80 may control the traveling direction of the exhaust gas 30. The swirl section 80 may increase the velocity and control the traveling direction. The thick arrow shown in FIG. 13 is an example of the flow path direction of the exhaust gas 30 passing through the swirl section 80.

[0141] In this example, as viewed from the traveling direction E2, the exhaust gas 30 travels from the inlet end 102 to the outlet end 104 while swirling around the support 81. The velocity of the exhaust gas 30 refers to the tangential velocity of the flow path of the exhaust gas 30 at any position in the XY plane in the flow of the exhaust gas 30 as viewed from the traveling direction E2.

[0142] In this example, the reaction tower 10 has a swirling section 80 provided downstream of the first jetting section 14 in the traveling direction E1. The swirling section 80 in this example further increases the speed of the exhaust gas 30, the speed of which has been increased by the first jetting section 14. For this reason, the mist-like liquid 40 entrained in the exhaust gas 30 and proceeding to the exhaust gas outlet 17 is more likely to accumulate on the side wall 15 downstream of the exhaust gas 30 from the swirling section 80. When the mist-like liquid 40 accumulates on the side wall 15, the liquid 40 is more likely to become a liquid film. For this reason, when the reaction tower 10 has the swirling section 80, the liquid 40 entrained in the exhaust gas 30 is more difficult to be discharged to the outside of the exhaust gas treatment device 100 than when the reaction tower 10 does not have the swirling section 80.

[0143] Under standard conditions of a standard temperature of 0° C. and a standard pressure of 1 atmosphere, the velocity V1 may be 5 m / s or more and 25 m / s or less, or may be 10 m / s or more and 20 m / s or less, and the velocity V2 may be 5 m / s or more and 50 m / s or less, or may be 35 m / s or more and 45 m / s or less.

[0144] The swirl section 80 may guide the traveling direction of the exhaust gas 30 discharged from the swirl section 80 in a predetermined direction. The predetermined direction is, for example, a direction from the central axis 106 to the side wall 15 as viewed from the traveling direction E2.

[0145] The exhaust gas treatment device 100 may include an angle control unit 56. The angle control unit 56 controls the angle of the blade unit 82. The angle control unit 56 will be described later.

[0146] FIG. 14 is a diagram showing an example of the swiveling unit 80 shown in FIG. 1 and FIG. 13 when viewed from the traveling direction E2. In this example, the swiveling unit 80 has a support pillar 81. In this example, the support pillar 81 is provided at the position of the central axis 106. The support pillar 81 in this example is cylindrical with a central axis parallel to the Z axis. The position of the central axis of the cylindrical support pillar 81 may coincide with the position of the central axis 106. The position of the central axis of the cylindrical support pillar 81 may be position C1 (see FIG. 3). The multiple wing portions 82 may be provided to surround the periphery of the support pillar 81 when viewed from the traveling direction E2.

[0147] The wing portion 82 in this example includes one end 85 and the other end 86. The one end 85 is an end of the wing portion 82 disposed on the central axis 106 side as viewed from the traveling direction E2. The other end 86 is an end of the wing portion 82 disposed on the outer periphery side in the swirling direction F2 (described later) relative to the central axis 106 side as viewed from the traveling direction E2. As viewed from the traveling direction E2, at least a part of the other end 86 may be fixed to the side wall 15 of the reaction tower 10.

[0148] The swirling section 80 may be provided so as to cover at least a part of the inside of the reaction tower 10 as viewed from the traveling direction E2. In this example, the swirling section 80 is provided so as to cover the entire inside of the reaction tower 10 as viewed from the traveling direction E2. As described above, the swirling section 80 of this example has wing portions 82-1 to 82-8. In FIG. 14, the outer edges of the wing portions 82-1, 82-3, 82-5, and 82-7 are shown by thick lines. In this example, the entire inside of the reaction tower 10 is covered by the multiple wing portions 82 as viewed from the traveling direction E2. That is, in this example, the positions (positions of the outer edges) of the other ends 86 of the eight wing portions 82 as viewed from the traveling direction E2 are the same as the position of the side wall 15 of the reaction tower 10.

[0149] In this example, the exhaust gas 30 swirls clockwise in the swirl section 80 when viewed from the traveling direction E2. The swirling direction of the exhaust gas 30 is referred to as a swirling direction F2. The swirling direction F2 and the swirling direction F1 (see FIG. 3) may be the same.

[0150] The multiple wing portions 82 may be arranged inside the swirl portion 80 so that the exhaust gas 30 does not pass the position of the central axis 106 when viewed from the traveling direction E2. In this example, a support 81 is arranged at the position of the central axis 106 so that the exhaust gas 30 does not pass the position of the central axis 106 inside the swirl portion 80. By arranging the multiple wing portions 82 so that the exhaust gas 30 does not pass the position of the central axis 106, the atomized liquid 40 entrained in the exhaust gas 30 also does not pass the position of the central axis 106.

[0151] The speed of the exhaust gas 30 passing on the side wall 15 closer to the central axis 106 is likely to be smaller than the speed of the exhaust gas 30 passing on the side wall 15 closer to the central axis 106. Therefore, the centrifugal force applied to the mist liquid 40 contained in the exhaust gas 30 passing on the side wall 15 closer to the central axis 106 is likely to be smaller than the centrifugal force applied to the mist liquid 40 contained in the exhaust gas 30 passing on the side wall 15 closer to the central axis 106. Therefore, in order to accumulate the mist liquid 40 contained in the exhaust gas 30 on the side wall 15, it is preferable that the exhaust gas 30 does not pass the position of the central axis 106.

[0152] One end of the other end 86 of wing portion 82-1 is referred to as end P1, and the other end is referred to as end P2. In this example, the other end 86 extends in an arc shape from end P1 to end P2. The midpoint between end P1 and end P2 in the arc shape of the other end 86 is referred to as midpoint P3. A straight line passing through midpoint P3 and position C1 of the center of support 81 is referred to as line G1-G2. In FIG. 14, line G1-G2 is indicated by a dashed line.

[0153] FIG. 15 is an example of a side view of line G1-G2 shown in FIG. 14, viewed in the direction from G1 to G2. In FIG. 15, wing portions 82-2 to 82-8 are omitted. In FIG. 15, a direction passing through central axis 106 (position C1 of the center of support 81) and parallel to traveling direction E2 is shown by a fine dashed line. In the side view of FIG. 15, a direction passing through midpoint P3 and parallel to the XY plane is shown by a coarse dashed line. In the side view of FIG. 15, one end 85 of wing portion 82 is disposed at a position overlapping with the other end 86.

[0154] 15, the positions of the inlet end 102 and the outlet end 104 in the traveling direction E2 are indicated by dashed lines. In this example, the inlet end 102 and the outlet end 104 are parallel to the XY plane. In this example, the positions of the inlet end 102 and the outlet end 104 in the traveling direction E2 coincide with the end positions of the wing portion 82 on the exhaust gas inlet 11 side and the exhaust gas outlet 17 side, respectively.

[0155] The back surface 84 may intersect with the direction from the introduction end 102 to the outlet end 104 (traveling direction E2). The back surface 84 may form a predetermined first angle η1 with the direction from the introduction end 102 to the outlet end 104 (traveling direction E2). In this example, the wing portion 82-1 is inclined in a direction that forms a first angle η1 with the traveling direction E2, with the line G1-G2 as the central axis. The back surface 84-1 and the front surface 83-1 may form angles η1 and η2 with the traveling direction E2, respectively. The angles φ1 and φ2 may be equal or different.

[0156] In the swirl section 80, the traveling direction of the exhaust gas 30 from the inlet end 102 to the outlet end 104 is changed by the back surface 84 of the wing section 82. The exhaust gas 30, whose traveling direction has been changed by the back surface 84, proceeds from the outlet end 104 to the outside of the swirl section 80. In Figure 15, this traveling direction of the exhaust gas 30 is indicated by a thick arrow.

[0157] The first angle η1 may be variable. Angle control unit 56 may control the first angle η1. Wing portion 82 may be provided with a rotation axis 87 parallel to line G1-G2 (see FIG. 14) at the position of midpoint P3. Wing portion 82 may rotate around rotation axis 87 as a central axis.

[0158] FIG. 16 is a diagram showing an example of a block diagram of an exhaust gas processing device 100 according to an embodiment of the present invention. In FIG. 16, the first ejection section 14-1 to the first ejection section 14-8 shown in FIG. 2 are indicated as the first ejection section 114. The first ejection section 114-1 corresponds to the first ejection section 14-1 to the first ejection section 14-4. The first ejection section 114-2 corresponds to the first ejection section 14-5 to the first ejection section 14-8. In this example, the first ejection section 114-1 is disposed upstream of the first ejection section 114-2 in the traveling direction E1 of the exhaust gas 30. In this example, the first ejection section 114-1 is disposed closer to the exhaust gas inlet 11 (see FIG. 1) than the first ejection section 114-2. In FIG. 16, the second jetting portion 24-1 to the second jetting portion 24-N shown in FIG.

[0159] The flow rate of the exhaust gas 30 inside the reaction tower 10 is defined as an exhaust gas flow rate FG. The exhaust gas flow rate measuring unit 98 measures the exhaust gas flow rate FG. In this example, the exhaust gas flow rate measuring unit 98 measures the exhaust gas flow rate FG by a gas flow rate sensor 99.

[0160] The flow rate control unit 70 may control at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2 based on the exhaust gas flow rate FG. As described above, the first liquid flow rate FL1 and the second liquid flow rate FL2 are the flow rates of the liquid 40 supplied to the first jetting part 114 and the second jetting part 124, respectively.

[0161] The flow rate control unit 70 may reduce at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2 based on the exhaust gas flow rate FG. When the exhaust gas flow rate FG is a predetermined flow rate FG1 and the amount of the mist of liquid 40 discharged from the exhaust gas discharge port 17 exceeds a predetermined liquid volume M, the flow rate control unit 70 may reduce at least one of the first liquid flow rate FL1 and the second liquid flow rate FL so that the amount of the mist of liquid 40 discharged from the exhaust gas discharge port 17 becomes less than the liquid volume M.

[0162] The flow rate control unit 70 may reduce the first liquid flow rate FL1 so that the amount of the mist of liquid 40 discharged from the exhaust gas discharge port 17 becomes less than the liquid volume M. The first jetting unit 114 jets the liquid 40 at a position closer to the exhaust gas discharge port 17 than the second jetting unit 124. Therefore, the liquid 40 jetted by the first jetting unit 114 is more easily discharged from the exhaust gas discharge port 17 than the liquid 40 jetted by the second jetting unit 124. Therefore, when the amount of the mist of liquid 40 discharged from the exhaust gas discharge port 17 exceeds a predetermined liquid volume M, it is preferable that the flow rate control unit 70 reduce the first liquid flow rate FL1.

[0163] The flow rate control unit 70 may stop the supply of liquid 40 to the first jetting unit 114 based on the exhaust gas flow rate FG. It is more preferable that the flow rate control unit 70 stops the supply of liquid 40 to the first jetting unit 114 when the exhaust gas flow rate FG is a predetermined flow rate FG1 and the amount of the mist of liquid 40 discharged from the exhaust gas discharge port 17 exceeds a predetermined liquid amount M.

[0164] The angle control unit 56 may control the first angle η1 (see FIG. 15) based on the exhaust gas flow rate FG measured by the exhaust gas flow rate measurement unit 98. When the exhaust gas flow rate FG exceeds a predetermined flow rate FG1, the amount of the mist liquid 40 discharged from the exhaust gas exhaust port 17 exceeds a predetermined liquid amount M. When the exhaust gas flow rate FG exceeds the flow rate FG1, the angle control unit 56 may increase the first angle η1. When the exhaust gas flow rate FG exceeds the flow rate FG1, the amount of the liquid 40 entrained in the exhaust gas 30 is also more likely to increase than when the exhaust gas flow rate FG is less than the flow rate FG1. When the angle control unit 56 increases the first angle η1, the amount of the liquid 40 accumulated on the side wall 15 (see FIG. 1) on the exhaust gas exhaust port 17 side from the swirling unit 80 is more likely to increase than before the angle control unit 56 increases the first angle η1. Therefore, the amount of the mist liquid 40 discharged from the exhaust gas exhaust port 17 is more likely to decrease. The first angle η1 may be manually controlled based on the exhaust gas flow rate FG.

[0165] When the exhaust gas flow rate FG is equal to or less than the flow rate FG1, the angle control unit 56 may decrease the first angle η1. When the exhaust gas flow rate FG is equal to or less than the flow rate FG1, the angle control unit 56 may decrease the first angle η1 within a range in which the amount of the mist liquid 40 discharged from the exhaust gas discharge port 17 does not exceed a predetermined liquid amount M. By the angle control unit 56 decreasing the first angle η1, the pressure loss of the exhaust gas 30 in the swirl unit 80 tends to become smaller.

[0166] The flow control unit 70 may control at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2 based on the first angle η1 controlled by the angle control unit 56. The flow control unit 70 may reduce at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2 based on the first angle η1. When the first angle η1 is a predetermined angle A and the amount of the mist liquid 40 discharged from the exhaust gas discharge port 17 exceeds a predetermined liquid volume M, the flow control unit 70 may reduce at least one of the first liquid flow rate FL1 and the second liquid flow rate FL so that the amount of the mist liquid 40 discharged from the exhaust gas discharge port 17 becomes less than the liquid volume M. The flow control unit 70 may stop the supply of the liquid 40 to the first jetting unit 114 based on the first angle η1.

[0167] The angle control unit 56 may control the first angle η1 based on at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2 controlled by the flow rate control unit 70. When the sum of the first liquid flow rate FL1 and the second liquid flow rate FL2 exceeds a predetermined flow rate Fa, the amount of the mist of liquid 40 discharged from the exhaust gas discharge port 17 exceeds a predetermined liquid volume M. When the flow rate of the liquid 40 exceeds the flow rate M, the angle control unit 56 may increase the first angle η1. When the flow rate of the liquid 40 is equal to or less than the flow rate M, the angle control unit 56 may decrease the first angle η1.

[0168] FIG. 17 is a diagram showing an example of the relationship between the output of the power unit 50 and the first angle η1 (see FIG. 15). The angle control unit 56 may control the first angle η1 based on the output of the power unit 50 controlled by the output control unit 54. When the output of the power unit 50 exceeds a predetermined output P1, the amount of the mist liquid 40 discharged from the exhaust gas discharge port 17 exceeds a predetermined liquid amount M. When the output of the power unit 50 exceeds the output P1, the angle control unit 56 may increase the first angle η1. FIG. 17 is an example in which the angle control unit 56 controls to increase the first angle η1 when the output of the power unit 50 exceeds the output P1.

[0169] When angle control unit 56 increases first angle η1, the acceleration of exhaust gas 30 accelerating in swirling unit 80 tends to increase. Therefore, liquid 40 entrained in exhaust gas 30 tends to accumulate on side wall 15 (see FIG. 1) on the exhaust gas exhaust port 17 side rather than on the swirling unit 80. Therefore, the amount of mist-like liquid 40 discharged from exhaust gas exhaust port 17 tends to decrease.

[0170] The predetermined output P1 may be 30% or more and 70% or less, or may be 40% or more and 60% or less, of the maximum output of the power unit 50. The predetermined output P1 is, for example, 50% of the maximum output of the power unit 50.

[0171] When the output of the power unit 50 is less than the output P1, the angle control unit 56 may maintain the first angle η1 at a predetermined angle ηa. The angle ηa may be equal to or greater than 5° and equal to or less than 15°. The angle ηa is, for example, 10°.

[0172] The angle control section 56 may decrease the first angle η1 when the output of the power unit 50 is equal to or less than the output P1. When the first angle η1 is decreased, the pressure loss of the exhaust gas 30 in the swirl section 80 tends to become smaller.

[0173] When the output of the power plant 50 is the maximum output (output 100%), the angle control unit may control the first angle η1 to a predetermined angle ηb. The angle ηb may be 55° or more and 85° or less, or may be 60° or more and 80° or less. The angle ηa is, for example, 70°.

[0174] Angle control unit 56 may change the first angle η1 in response to changes in the output of the power unit 50, in a range in which the output of the power unit 50 is equal to or greater than output P1 and equal to or less than the maximum output. Angle control unit 56 may change the first angle η1 so as to be proportional to changes in the output of the power unit 50, in a range in which the output of the power unit 50 is equal to or greater than output P1 and equal to or less than the maximum output.

[0175] Fig. 18 is a diagram showing an example of the relationship between the output of the power unit 50 and a first liquid flow rate FL1. Fig. 19 is a diagram showing an example of the relationship between the output of the power unit 50 and a second liquid flow rate FL2. The predetermined first output, second output, and third output of the power unit 50 are the first output P1, the second output P2, and the third output P3, respectively. The second output P2 is greater than the first output P1. The third output P3 is greater than the second output P2.

[0176] The first predetermined liquid flow rate FL1 of the liquid 40 is defined as flow rate f1-1 and flow rate f1-2. The flow rate f1-2 is greater than the flow rate f1-1. The second predetermined liquid flow rate FL2 of the liquid 40 is defined as flow rate f2-1 and flow rate f2-2. The flow rate f2-2 is greater than the flow rate f2-1.

[0177] The flow control unit 70 may control at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2 based on the output of the power unit 50 controlled by the output control unit 54. When the output of the power unit 50 changes from the second output P2 to the third output P3, the flow control unit 70 may maintain the first liquid flow rate FL1 at the flow rate f1-1. When the output of the power unit 50 changes from the second output P2 to the third output P3, the flow control unit 70 may change the first liquid flow rate FL1 from the flow rate f1-1 to the flow rate f1-2.

[0178] When the output of the power unit 50 changes from the third output P3 to the second output P2, the flow control unit 70 may maintain the first liquid flow rate FL1 at the flow rate f1-2. When the output of the power unit 50 changes from the third output P3 to the second output P2, the flow control unit 70 may change the first liquid flow rate FL1 from the flow rate f1-2 to the flow rate f1-1.

[0179] The flow rate control unit 70 may maintain the second liquid flow rate FL2 at the flow rate f2-2 regardless of the output of the power unit 50. The flow rate control unit 70 may change the second liquid flow rate FL2 based on the output of the power unit 50. In this example, the flow rate control unit 70 maintains the second liquid flow rate FL2 at the flow rate f2-2 regardless of the output of the power unit 50.

[0180] 18, it is preferable to provide hysteresis in the first liquid flow rate FL1 between the second output P2 and the third output P3 of the power unit 50. By providing hysteresis in the first liquid flow rate FL1, the exhaust gas 30 is more likely to be reliably treated by the liquid 40 ejected by the first ejection part 14. Since the first ejection part 14 is closer to the exhaust gas outlet 17 than the second ejection part 24, the exhaust gas 30 is more likely to be reliably treated by the liquid 40, which makes it easier to prevent the exhaust gas 30 not treated by the liquid 40 from being discharged from the exhaust gas outlet 17.

[0181] The flow rate f1-1 may be the minimum value of the first liquid flow rate FL1. The minimum value may be zero. The flow rate f1-2 may be the maximum value of the first liquid flow rate FL1. The maximum value may be the maximum amount of liquid 40 that the first jetting part 14 can jet. The flow rate control part 70 may control the first liquid flow rate FL1 to either the minimum value or the maximum value.

[0182] The flow rate f2-1 may be the minimum value of the second liquid flow rate FL2. The minimum value may be zero. The flow rate f2-2 may be the maximum value of the second liquid flow rate FL2. The maximum value may be the maximum amount of liquid 40 that the second jetting part 24 can jet. The flow rate control part 70 may control the second liquid flow rate FL2 to either the minimum value or the maximum value.

[0183] 20 is a diagram showing another example of an exhaust gas treatment device 100 according to an embodiment of the present invention. The exhaust gas treatment device 100 of this example differs from the exhaust gas treatment device 100 shown in FIG. 1 in that it further includes an exhaust gas discharge pipe 61 and a liquid detection unit 77. The exhaust gas discharge pipe 61 discharges the exhaust gas 30. The liquid detection unit 77 detects the presence or absence of liquid 40 in the exhaust gas discharge pipe 61.

[0184] The exhaust gas discharge pipe 61 is connected to the reaction tower 10. In this example, the exhaust gas discharge pipe 61 is connected to the exhaust gas outlet 17 of the reaction tower 10. As described above, in the reaction tower 10, the exhaust gas 30 is treated by the liquid 40. The exhaust gas discharge pipe 61 discharges the exhaust gas 30.

[0185] The exhaust gas discharge pipe 61 has a side wall 62. The side wall 62 is an inner surface of the exhaust gas discharge pipe 61 that contacts the space through which the exhaust gas 30 passes.

[0186] The traveling direction of the exhaust gas 30 in the exhaust gas discharge pipe 61 is defined as a traveling direction E1'. The traveling direction E1' may be parallel to the traveling direction E1 of the exhaust gas 30 in the reaction tower 10. The width of the exhaust gas discharge pipe 61 in a direction intersecting the traveling direction E1' is defined as a width Wg. The width Wg is the width from one side wall 62 to the other side wall 62 in the side view of FIG. 20. The width Wg may be the width of the exhaust gas discharge pipe 61 in a direction intersecting the traveling direction E1'.

[0187] The width of the reaction tower 10 in a direction intersecting the traveling direction E1 is defined as a width Wr. The width Wr is the width from one side wall 15 to the other side wall 15 in the side view of FIG. 20. The width Wr may be the width of the reaction tower 10 in a direction perpendicular to the traveling direction E1.

[0188] The width Wg may be smaller than the width Wr. When the width Wg is smaller than the width Wr, the swirling speed of the flue gas 30 swirling in the swirling direction F1 in the flue gas discharge pipe 61 tends to be larger than the swirling speed of the flue gas 30 swirling in the swirling direction F1 in the reaction tower 10.

[0189] The exhaust gas discharge pipe 61 may have a swirling section 80. In this example, the swirling section 80 is provided in the exhaust gas discharge pipe 61. The swirling section 80 swirls the exhaust gas 30. Therefore, the liquid 40 entrained in the exhaust gas 30 tends to accumulate on the side wall 62 downstream of the swirling section 80 in the exhaust gas discharge pipe 61. Therefore, the liquid 40 tends to form a liquid film on the side wall 62. Therefore, the liquid 40 is likely to be suppressed from being discharged to the outside of the exhaust gas treatment device 100.

[0190] The liquid detection unit 77 detects the presence or absence of liquid 40 downstream of the swirl unit 80 in the traveling direction 1'. The exhaust gas treatment device 100 may include a liquid sensor 97 that detects the liquid 40 in the exhaust gas discharge pipe 61. In this example, the liquid detection unit 77 detects the presence or absence of liquid 40 inside the exhaust gas discharge pipe 61 by the liquid sensor 97. The liquid detection unit 77 may measure the amount of liquid 40 downstream of the swirl unit 80.

[0191] The amount of liquid 40 in the exhaust gas discharge pipe 61 may be the mass or volume of liquid 40 passing per unit time through a cross section of the exhaust gas discharge pipe 61 intersecting with the traveling direction E1'. The amount of liquid 40 may be the mass or volume of liquid 40 that forms a liquid film on the side wall 62 of the exhaust gas discharge pipe 61 per unit time.

[0192] In this example, one of the first jetting parts 114 is referred to as a first jetting part 114-1, and the other first jetting part 114 is referred to as a first jetting part 114-2. The flow rate control part 70 may control a first liquid flow rate FL1 supplied to the first jetting part 114-1 and a first liquid flow rate FL1' supplied to the first jetting part 114-2. The flow rate control part 70 may control at least one of the first liquid flow rate FL1 and the first liquid flow rate FL1' based on the presence or absence of the liquid 40 detected by the liquid detection part 77. The flow rate control part 70 may control a second liquid flow rate FL2 based on the presence or absence of the liquid 40 detected by the liquid detection part 77.

[0193] When the liquid detection unit 77 detects the liquid 40 by the liquid sensor 97-1, the flow rate control unit 70 may reduce the amount of liquid 40 supplied to the first jetting unit 114-2. The amount of liquid 40 supplied may be the mass or volume of liquid 40 supplied to the first jetting unit 114-2 per unit time. When the liquid detection unit 77 detects the liquid 40 by the liquid sensor 97-1, the flow rate control unit 70 may stop the supply of liquid 40 to the first jetting unit 114-2.

[0194] Angle control unit 56 may control the first angle η1 (see FIG. 15) based on the presence or absence of liquid 40 detected by liquid detection unit 77. When liquid detection unit 77 detects liquid 40 by liquid sensor 97-1, angle control unit 56 may increase the first angle η1. When liquid detection unit 77 detects liquid 40 by liquid sensor 97-2, angle control unit 56 may control the first angle η1 to its maximum.

[0195] The flow rate control unit 70 may control the first liquid flow rate FL1 based on the amount of liquid 40 measured by the liquid detection unit 77. The flow rate control unit 70 may control the second liquid flow rate FL2 based on the amount of liquid 40 measured by the liquid detection unit 77. As described above, the first liquid flow rate FL1 and the second liquid flow rate FL2 are the flow rates of the liquid 40 supplied to the first jetting unit 114 and the second jetting unit 124, respectively.

[0196] The flow rate control unit 70 may reduce at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2 based on the amount of liquid 40 measured by the liquid detection unit 77. When the amount of liquid 40 measured by the liquid detection unit 77 exceeds a predetermined liquid volume M', the flow rate control unit 70 may reduce at least one of the first liquid flow rate FL1 and the second liquid flow rate FL so that the amount of liquid 40 in the exhaust gas discharge pipe 61 becomes less than the liquid volume M'.

[0197] The flow rate control unit 70 may stop the supply of liquid 40 to at least one of the first jetting unit 114 and the second jetting unit 124 based on the amount of liquid 40 measured by the liquid detection unit 77. It is more preferable that the flow rate control unit 70 stops the supply of liquid 40 to the first jetting unit 114 and the second jetting unit 124 when the amount of liquid 40 in the exhaust gas discharge pipe 61 exceeds a predetermined liquid amount M'.

[0198] Angle control unit 56 may control the first angle η1 (see FIG. 15) based on the amount of liquid 40 measured by liquid detection unit 77. When the amount of liquid 40 measured by liquid detection unit 77 exceeds the liquid volume M', angle control unit 56 may increase the first angle η1. When angle control unit 56 increases the first angle η1, the amount of liquid 40 accumulating on side wall 62 downstream of swirling unit 80 in traveling direction E1' is more likely to increase than before angle control unit 56 increased first angle η1. For this reason, the amount of liquid 40 discharged to the outside of exhaust gas treatment device 100 is more likely to decrease.

[0199] When the amount of liquid 40 measured by liquid detection unit 77 is equal to or less than liquid volume M', angle control unit 56 may decrease first angle η1 (see FIG. 15). When the amount of liquid 40 measured by liquid detection unit 77 is equal to or less than liquid volume M', angle control unit 56 may decrease first angle η1 within a range in which the amount of liquid 40 does not exceed liquid volume M'. By angle control unit 56 decreasing first angle η1, the pressure loss of exhaust gas 30 in swirling unit 80 tends to become smaller.

[0200] The flow rate control unit 70 may control at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2 based on the first angle η1 (see FIG. 15) controlled by the angle control unit 56. The angle control unit 56 may control the first angle η1 based on at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2 controlled by the flow rate control unit 70.

[0201] The first and second positions of the exhaust gas discharge pipe 61 in the traveling direction E1' are defined as a first position P1 and a second position P2, respectively. The liquid detection unit 77 may measure a first amount of the liquid 40 at the first position P1 and a second amount of the liquid 40 at the second position P2. In the traveling direction E1', the second position P2 is different from the first position P1. The second position P2 is downstream of the first position P1 in the traveling direction E1'. In this example, a liquid sensor 97-1 is provided at the first position P1, and a liquid sensor 97-2 is provided at the second position P2.

[0202] A predetermined first threshold amount of the liquid 40 at the first position P1 is defined as a first threshold amount M1. A predetermined second threshold amount of the liquid 40 at the second position P2 is defined as a second threshold amount M2. The second threshold amount M2 is the amount of hydrogen sulfite ions (HSO3 - The first threshold amount M1 may be the amount of the liquid 40 at which the amount of the liquid 40 containing the liquid 40 containing the component (A) is equal to or greater than a predetermined regulation value. The first threshold amount M1 may be smaller than the second threshold amount M2.

[0203] When the first amount of liquid 40 at the first position P1 is less than a first threshold amount M1, the flow control unit 70 may increase at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2. When the first amount of liquid 40 at the first position P1 is less than the first threshold amount M1, the flow control unit 70 may increase at least one of the first liquid flow rate FL1 and the second liquid flow rate FL2 to the extent that the second amount of liquid 40 at the second position P2 is less than a second threshold amount M2.

[0204] When the second amount of liquid 40 at second position P2 is equal to or greater than second threshold amount M2, angle control unit 56 may increase first angle η1 (see FIG. 15). When angle control unit 56 increases the first angle η1, the amount of liquid 40 accumulating on sidewall 62 downstream of swirling unit 80 in traveling direction E1' is more likely to increase than before angle control unit 56 increased first angle η1. For this reason, the amount of liquid 40 discharged to the outside of exhaust gas treatment device 100 is more likely to decrease.

[0205] The exhaust gas discharge pipe 61 may have a recovery section 51. The recovery section 51 may be provided downstream of the swirling section 80 in the traveling direction E1′. The recovery section 51 recovers at least a portion of the liquid 40 in the exhaust gas discharge pipe 61.

[0206] Fig. 21 is a diagram showing an example of the details of the recovery unit 51 shown in Fig. 20. The recovery unit 51 may be provided in a circumferential shape in the circumferential direction of the side wall 62. In this example, the recovery unit 51 includes a recovery chamber 55 that recovers the liquid 40 that has treated the exhaust gas 30.

[0207] Fig. 22 is a diagram showing an example of an XZ cross section of a part of the collection section 51 shown in Fig. 21. In this example, the collection section 51 has an introduction section 59, a collection chamber 55, and a drainage section 53. The introduction section 59 and the collection chamber 55 may be provided inside and outside the exhaust gas discharge pipe 61, respectively. In Fig. 22, the ranges of the introduction section 59 and the collection chamber 55 in the XZ cross section are indicated by double arrows. The drainage section 53 may be provided on the bottom surface 57 of the collection chamber 55.

[0208] In this example, the recovery section 51 is provided with an opening 52 and an opening 58. The liquid 40 obtained by treating the exhaust gas 30 is introduced into the opening 52. In this example, the opening 52 is provided inside the reaction tower 10. In this example, the opening 52 communicates between the inside of the exhaust gas discharge pipe 61 and the introduction section 59. The opening 52 may be provided at the end of the introduction section 59 on the swirling section 80 side. In this example, the introduction section 59 and the recovery chamber 55 are communicated with each other through the opening 58.

[0209] The liquid 40 entrained in the exhaust gas 30 swirled by the swirling section 80 is referred to as droplets 42. The droplets 42 are likely to turn into a liquid film on the side wall 62. The droplets 42 that have turned into a liquid film on the side wall 62 are referred to as a liquid film 44.

[0210] The exhaust gas treatment device 100 of this example further includes a recovery section 51. Therefore, in the exhaust gas treatment device 100 of this example, the recovery section 51 can recover the liquid film 44. Therefore, compared to a case in which the exhaust gas treatment device 100 does not include the recovery section 51, the liquid 40 is less likely to be entrained in the exhaust gas 30 and discharged to the outside of the exhaust gas treatment device 100.

[0211] In the case where the exhaust gas treatment device 100 shown in FIG. 20 includes the exhaust gas discharge pipe 61 and the liquid detection unit 77, the reaction tower 10 may include the swirl section 80. When the reaction tower 10 includes the swirl section 80, the reaction tower 10 may include the recovery section 51, or the exhaust gas discharge pipe 61 may include the recovery section 51. A pressure loss may occur in the exhaust gas 30 passing through the swirl section 80. In the example of FIG. 20, the width Wr is larger than the width Wg, so that the pressure loss in the case where the reaction tower 10 includes the swirl section 80 tends to be smaller than the pressure loss in the case where the exhaust gas discharge pipe 61 includes the swirl section 80.

[0212] Fig. 23 is a flowchart showing an example of a method for controlling the first jetting section 114, the second jetting section 124, and the first angle η1 (see Fig. 15) in the exhaust gas processing device 100 shown in Fig. 20. Step S100 is a step for jetting the liquid 40 by the second jetting section 124. In step 100, the flow rate control section 70 (see Fig. 20) may control the jetting of the liquid 40 by the second jetting section 124.

[0213] Step S102 is a step of detecting the liquid 40 at the first position P1. In step S102, the liquid detection unit 77 (see FIG. 20) may detect the liquid 40 at the first position P1. If the liquid 40 is detected at the first position P1 in step S102, the control method proceeds to step S104.

[0214] Step S104 is a step of ejecting the liquid 40 from the first ejection part 114. In step S104, the flow rate control part 70 (see FIG. 20) may control the ejection of the liquid 40 from the first ejection part 114.

[0215] As described above, the liquid 40 ejected by the first ejection part 114 tends to promote the swirling of the exhaust gas 30 in the swirling direction F1 (see FIG. 3). The liquid 40 ejected by the first ejection part 114 tends to increase the speed of the exhaust gas 30. Therefore, the liquid 40 entrained in the exhaust gas 30 tends to accumulate on the side wall 15 (see FIGS. 1 and 2) downstream of the first ejection part 14 in the traveling direction E1' due to centrifugal force. Therefore, the liquid 40 tends to form a liquid film on the side wall 15. Therefore, the amount of the liquid 40 at the first position P1 in step S104 tends to be smaller than the amount of the liquid 40 at the first position P1 in step S102.

[0216] Step S106 is a step of detecting the liquid 40 at the second position P2. In step S106, the liquid detection unit 77 (see FIG. 20) may detect the liquid 40 at the second position P2. If the liquid 40 is detected at the second position P2 in step S106, the control method proceeds to step S108.

[0217] Step S108 is a stage for controlling the first angle η1 (see FIG. 15). In step S108, the angle control unit 56 may control the first angle η1. In step S108, the angle control unit 56 may increase the first angle η1.

[0218] When angle control unit 56 increases first angle η1 (see FIG. 15), the amount of liquid 40 that accumulates on sidewall 62 downstream of swirl unit 80 in traveling direction E1' is likely to increase compared to before angle control unit 56 increases first angle η1. As a result, the amount of liquid 40 discharged to the outside of exhaust gas treatment device 100 is likely to decrease.

[0219] 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 clear 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 claims that such modifications and improvements can also be included in the technical scope of the present invention.

[0220] It should be noted that the order of execution of each process, such as operations, procedures, steps, and stages, in the devices, systems, programs, and methods shown in the claims, specifications, and drawings is not specifically stated as "before," "prior to," etc., and may be realized in any order unless the output of a previous process is used in a later process. Even if the operational flow in the claims, specifications, and drawings is explained using "first," "next," etc. for convenience, it does not mean that it is essential to perform the process in this order. [Item 1] The flow rate control unit reduces at least one of the first liquid flow rate and the second liquid flow rate based on the flow rate of the exhaust gas measured by the exhaust gas flow rate measurement unit. [Item 2] The reaction tower has an exhaust gas outlet through which the exhaust gas is discharged, The flow rate control unit reduces the first liquid flow rate so that the amount of the liquid discharged from the exhaust gas outlet is less than a predetermined liquid amount. [Item 3] The flow rate control unit reduces at least one of the first liquid flow rate and the second liquid flow rate based on the amount of the liquid measured by the liquid detection unit. [Item 4] The flow rate control unit stops the supply of the liquid to at least one of the first jetting unit and the second jetting unit based on the amount of the liquid measured by the liquid detection unit. [Item 5] an exhaust gas outlet pipe for outletting the exhaust gas; a liquid detection unit that detects the liquid in the exhaust gas discharge pipe; a flow rate control unit that controls a first liquid flow rate, which is a flow rate of the liquid supplied to the first jetting unit; Further equipped with The exhaust gas discharge pipe has a swirling portion that swirls the exhaust gas, the exhaust gas outlet pipe is connected to the reaction tower and outlets the exhaust gas that has been treated by the liquid in the reaction tower; a width of the exhaust gas discharge pipe in a direction intersecting the flow direction of the exhaust gas in the exhaust gas discharge pipe is smaller than a width of the reaction tower in a direction intersecting the flow direction of the exhaust gas in the reaction tower, the liquid detection unit measures an amount of the liquid downstream of the swirl unit in a traveling direction of the exhaust gas in the exhaust gas discharge pipe, the flow rate control unit controls the first liquid flow rate based on the amount of the liquid measured by the liquid detection unit. Exhaust gas treatment device. [Item 6] The reaction tower further includes a liquid spraying part provided on the exhaust gas inlet side of the first jetting part in a direction from the exhaust gas inlet to the exhaust gas outlet, and a second jetting part that jets the liquid in the liquid spraying part into the reaction tower, The liquid ejected by the second ejection portion is distributed in a circular shape in a cross section intersecting with the ejection axis of the second ejection portion, The flow rate control unit further controls a second liquid flow rate, which is a flow rate of the liquid supplied to the second jetting unit, based on the amount of the liquid measured by the liquid detection unit. Item 6. The exhaust gas treatment device according to item 5. [Item 7] An angle control unit is further provided, The swirl section has an inlet end into which the exhaust gas is introduced and an outlet end from which the exhaust gas is discharged, The exhaust gas travels from the inlet end to the outlet end while swirling in a predetermined swirling direction inside the swirling section, The swivel portion includes a wing portion, a surface of the wing portion on the side of the introduction end intersects with a direction from the introduction end to the outlet end of the swirl portion, A first angle formed between a surface of the blade portion on the introduction end side and a direction from the introduction end to the outlet end is variable, The angle control unit controls the first angle based on the amount of the liquid measured by the liquid detection unit. Item 7. The exhaust gas treatment device according to item 5 or 6. [Item 8] An angle control unit is further provided, The swirl section has an inlet end into which the exhaust gas is introduced and an outlet end from which the exhaust gas is discharged, The exhaust gas travels from the inlet end to the outlet end while swirling in a predetermined swirling direction inside the swirling section, The swivel portion includes a wing portion, a surface of the wing portion on the side of the introduction end intersects with a direction from the introduction end to the outlet end of the swirl portion, A first angle formed between a surface of the blade portion on the introduction end side and a direction from the introduction end to the outlet end is variable, the liquid detection unit measures a first amount of the liquid at a first position in the exhaust gas discharge pipe, and a second amount of the liquid at a second position in the exhaust gas discharge pipe, the second position being downstream of the first position in a traveling direction of the exhaust gas in the exhaust gas discharge pipe; If the first amount of the liquid is less than a first predetermined threshold amount, the flow rate control unit increases at least one of the first liquid flow rate and the second liquid flow rate; When the second amount of the liquid is equal to or greater than a second predetermined threshold amount, the angle control unit increases the first angle. Item 7. The exhaust gas treatment device according to item 6. [Explanation of symbols]

[0221] 10 reaction tower, 11 exhaust gas inlet, 12 main pipe, 13 branch pipe, 14 first jetting portion, 15 side wall, 16 bottom surface, 17 exhaust gas outlet, 18 gas treatment portion, 19 liquid outlet, 20 drain pipe, 22 main pipe, 23 branch pipe, 24 second jetting portion, 30 exhaust gas, 31 bottom surface, 3 2 exhaust gas introduction pipe, 34 groove, 36 ejection surface, 37 back surface, 38 ejection opening, 39 upper surface, 40 liquid, 42 droplet, 44 liquid film, 46 drainage, 50 power unit, 51 recovery section, 52 opening, 53 drainage section, 54 output control section, 55 recovery chamber, 56 angle control section, 57 bottom surface, 58 opening, 59 introduction section, 60 pump, 61 exhaust gas discharge pipe, 62 side wall, 70 flow rate control section, 72 valve, 77 liquid detection section, 80 swivel section, 81 support, 82 blade section, 83 front surface, 84 rear surface, 85 one end, 86 other end, 87 rotating shaft, 90 Liquid spray portion, 97 liquid sensor, 98 exhaust gas flow rate measuring portion, 99 gas flow rate sensor, 100 exhaust gas treatment device, 102 inlet end, 104 outlet end, 106 central axis, 114 first ejection portion, 124 second ejection portion, 131 lower surface, 136 ejection surface, 138 ejection opening, 139 upper surface

Claims

1. a reaction tower having an exhaust gas inlet into which an exhaust gas is introduced and an exhaust gas outlet from which the exhaust gas is discharged, and to which a liquid for treating the exhaust gas is supplied; The reaction tower further has one or more first ejection parts that eject the liquid into the reaction tower, The exhaust gas travels from the exhaust gas inlet to the exhaust gas outlet while swirling in a predetermined swirling direction inside the reaction tower, The liquid ejected by the first ejection part is distributed in a shape having a major axis and a minor axis in a cross section intersecting with an ejection axis of the first ejection part, a first end of an injection surface including an injection axis and the long axis of the first injection part, the first end being on the upstream side in the swirling direction, is disposed closer to the exhaust gas discharge port in a direction from the exhaust gas inlet to the exhaust gas discharge port than a second end of the injection surface, the second end being on the downstream side of the first end in the swirling direction, Exhaust gas treatment device.

2. The exhaust gas treatment device according to claim 1 , wherein the injection axis of the first injection part forms a predetermined angle with a direction perpendicular to a direction from the exhaust gas inlet to the exhaust gas outlet.

3. The exhaust gas treatment device according to claim 1 , wherein the injection surface is inclined in the same direction with respect to the direction from the exhaust gas inlet to the exhaust gas outlet in the swirling direction from the first end to the second end.

4. the reaction tower further includes a swirling section that is provided on the exhaust gas discharge port side of the first jetting section in a direction from the exhaust gas inlet to the exhaust gas discharge port and swirls the exhaust gas, The swirl section has an inlet end into which the exhaust gas is introduced and an outlet end from which the exhaust gas is discharged, The exhaust gas travels from the inlet end to the outlet end while swirling in a predetermined swirling direction inside the swirling section, The swivel portion includes a wing portion, a surface of the wing portion on the side of the introduction end intersects with a direction from the introduction end to the outlet end of the swirl portion, A first angle formed between a surface of the wing portion on the introduction end side and a direction from the introduction end to the outlet end in the swirl portion is variable. The exhaust gas treatment device according to claim 1 .

5. an output control unit that controls the output of a power plant that discharges the exhaust gas; an angle control unit that controls the first angle based on the output of the power plant controlled by the output control unit; The exhaust gas treatment device according to claim 4 , further comprising:

6. The exhaust gas treatment device according to claim 5 , wherein the swirl section is provided so as to cover the entire inside of the reaction tower when viewed in a direction from the outlet end to the inlet end.

7. The reaction tower further includes a liquid spraying part provided closer to the exhaust gas inlet than the first spraying part in a direction from the exhaust gas inlet to the exhaust gas outlet, and a second spraying part that sprays the liquid into the reaction tower in the liquid spraying part, The liquid jetted by the second jetting portion is distributed in a circular shape in a cross section intersecting with the jet axis of the second jetting portion. The exhaust gas treatment device according to claim 5 or 6.

8. The exhaust gas treatment device according to claim 7 , wherein a particle size of the liquid ejected by the first ejection part is equal to or larger than a particle size of the liquid ejected by the second ejection part.

9. a flow rate control unit that controls at least one of a first liquid flow rate, which is a flow rate of the liquid supplied to the first jetting unit, and a second liquid flow rate, which is a flow rate of the liquid supplied to the second jetting unit; an exhaust gas flow rate measuring unit for measuring a flow rate of the exhaust gas inside the reaction tower; Further equipped with the flow rate control unit controls at least one of the first liquid flow rate and the second liquid flow rate based on the flow rate of the exhaust gas measured by the exhaust gas flow rate measuring unit. The exhaust gas treatment device according to claim 7 or 8.

10. The exhaust gas treatment device according to claim 9 , wherein the flow rate control unit stops the supply of the liquid to the first ejection unit based on the flow rate of the exhaust gas measured by the exhaust gas flow rate measurement unit.

11. The exhaust gas treatment device according to claim 9 , wherein the flow rate control unit controls at least one of the first liquid flow rate and the second liquid flow rate based on the first angle controlled by the angle control unit.

12. The exhaust gas treatment device according to claim 9 , wherein the angle control unit controls the first angle based on a flow rate of the exhaust gas measured by the exhaust gas flow rate measurement unit.

13. 13. The exhaust gas treatment device according to claim 9, wherein the angle control unit controls the first angle based on at least one of the first liquid flow rate and the second liquid flow rate controlled by the flow rate control unit.

14. a flow rate control unit that controls at least one of a first liquid flow rate, which is a flow rate of the liquid supplied to the first jetting unit, and a second liquid flow rate, which is a flow rate of the liquid supplied to the second jetting unit; the flow rate control unit controls at least one of the first liquid flow rate and the second liquid flow rate based on the output of the power plant controlled by the output control unit. The exhaust gas treatment device according to claim 7 or 8.

15. an exhaust gas outlet pipe for outletting the exhaust gas; a liquid detection unit that detects the liquid in the exhaust gas discharge pipe; a flow rate control unit that controls a first liquid flow rate, which is a flow rate of the liquid supplied to the first jetting unit; Further equipped with The exhaust gas discharge pipe has a swirling portion that swirls the exhaust gas, the exhaust gas discharge pipe is connected to the reaction tower and discharges the exhaust gas that has been treated by the liquid in the reaction tower; a width of the exhaust gas discharge pipe in a direction intersecting the flow direction of the exhaust gas in the exhaust gas discharge pipe is smaller than a width of the reaction tower in a direction intersecting the flow direction of the exhaust gas in the reaction tower, the liquid detection unit detects the presence or absence of the liquid downstream of the swirl unit in a traveling direction of the exhaust gas in the exhaust gas discharge pipe, the flow rate control unit controls the first liquid flow rate supplied to one of the first jetting parts and the first liquid flow rate supplied to another of the first jetting parts that is disposed closer to the exhaust gas outlet than the one of the first jetting parts, the flow rate control unit controls at least one of the first liquid flow rate supplied to the one first jetting unit and the first liquid flow rate supplied to the other first jetting unit based on the presence or absence of the liquid detected by the liquid detection unit. The exhaust gas treatment device according to claim 1 .

16. The reaction tower further includes a liquid spraying part provided closer to the exhaust gas inlet than the first spraying part in a direction from the exhaust gas inlet to the exhaust gas outlet, and a second spraying part that sprays the liquid into the reaction tower in the liquid spraying part, The liquid jetted by the second jetting portion is distributed in a circular shape in a cross section intersecting with the jet axis of the second jetting portion, The flow rate control unit further controls a second liquid flow rate, which is a flow rate of the liquid supplied to the second jetting unit, based on the presence or absence of the liquid detected by the liquid detection unit. The exhaust gas treatment device according to claim 15.

17. An angle control unit is further provided. The swirl section has an inlet end into which the exhaust gas is introduced and an outlet end from which the exhaust gas is discharged, The exhaust gas travels from the inlet end to the outlet end while swirling in a predetermined swirling direction inside the swirling section, The swivel portion includes a wing portion, a surface of the wing portion on the side of the introduction end intersects with a direction from the introduction end to the outlet end of the swirl portion, A first angle formed between a surface of the wing portion on the introduction end side and a direction from the introduction end to the outlet end is variable, The angle control unit controls the first angle based on the presence or absence of the liquid measured by the liquid detection unit. The exhaust gas treatment device according to claim 15 or 16.

18. An angle control unit is further provided. The swirl section has an inlet end into which the exhaust gas is introduced and an outlet end from which the exhaust gas is discharged, The exhaust gas travels from the inlet end to the outlet end while swirling in a predetermined swirling direction inside the swirling section, The swivel portion includes a wing portion, a surface of the wing portion on the side of the introduction end intersects with a direction from the introduction end to the outlet end of the swirl portion, A first angle formed between a surface of the wing portion on the introduction end side and a direction from the introduction end to the outlet end is variable, the liquid detection unit detects the presence or absence of the liquid at a first position of the exhaust gas discharge pipe, and the presence or absence of the liquid at a second position of the exhaust gas discharge pipe, the second position being downstream of the first position in a traveling direction of the exhaust gas in the exhaust gas discharge pipe, When the liquid is detected at the first position, the angle control unit increases the first angle, When the liquid is detected at the second position, the angle control unit controls the first angle to a maximum. The exhaust gas treatment device according to claim 16.

Images