JP2022181959A - Exhaust gas treatment device - Google Patents

Abstract

To make it possible that when discharging an effluent after treating exhaust gas in an exhaust gas treatment device to the exterior of the exhaust gas treatment device, the effluent preferably satisfies regulations.SOLUTION: The exhaust gas treatment device comprises: a reactor to which an exhaust gas discharged by a power device and a liquid for treating the exhaust gas are supplied, and which discharges an effluent after treating the exhaust gas; a changeover control part which switches whether or not the effluent is supplied to the reactor; a storage part which stores the effluent; a water quality measurement part which measures water quality of the effluent; and a mixing control part. The reactor discharges a first effluent after treating the exhaust gas when the effluent is supplied to the reactor, and discharges a second effluent after treating the exhaust gas when the effluent is not supplied to the reactor. The storage part stores the first effluent, and the mixing control part controls a mixing ratio of the second effluent and the first effluent stored in the storage part on the basis of water quality of the second effluent that has been measured by the water quality measurement part.SELECTED DRAWING: Figure 1

Description

The present invention relates to an exhaust gas treatment device.

Patent Document 1 states that "the process of purifying exhaust gas using a scrubber produces dirty scrubber liquid" (paragraph 0003).
Patent Document 2 describes that "PM is collected with high efficiency by supplying exhaust gas containing PM, SOx, etc., emitted from a marine diesel engine to an electrostatic precipitator" (paragraph 0011).
In Patent Document 3, "Sulfur oxides mainly composed of sulfurous acid gas (SO ₂ ) contained in exhaust gas are brought into contact with an absorption liquid consisting of an aqueous solution in which limestone (CaCO ₃ ) is dissolved or suspended to neutralize it. ” (Paragraph 0002).
Patent Literature 4 describes, "Providing a water treatment apparatus capable of easily constructing a device and piping necessary for discharging scrubber water and foreign matters in a ship" (abstract).
[Prior art documents]
[Patent Literature]
[Patent Document 1] Japanese Patent No. 6177835 [Patent Document 2] Japanese Patent No. 5971355 [Patent Document 3] Japanese Patent No. 3774960 [Patent Document 4] Japanese Patent Application Laid-Open No. 2019-118903

When the waste liquid obtained by treating the exhaust gas in the exhaust gas processing apparatus is discharged to the outside of the exhaust gas processing apparatus, the waste liquid preferably satisfies the regulation.

A first aspect of the present invention provides an exhaust gas treatment apparatus. The exhaust gas treatment device is supplied with the exhaust gas discharged by the power plant and the liquid for treating the exhaust gas, and switches between the reaction tower for discharging the waste fluid after treating the exhaust gas and whether the waste fluid is supplied to the reaction tower. A switching control unit, a storage unit that stores the waste liquid, a water quality measurement unit that measures the water quality of the waste liquid, and a mixing control unit are provided. The reaction tower discharges the first waste liquid after treating the exhaust gas when the waste liquid is supplied to the reaction tower, and discharges the second waste liquid after treating the exhaust gas when the waste liquid is not supplied to the reaction tower. Discharge. The storage part stores the first drainage liquid. The mixing control unit controls the mixing ratio of the second waste liquid and the first waste liquid stored in the storage unit based on the water quality of the second waste liquid measured by the water quality measuring unit.

The water quality measurement unit may further measure the water quality of the first waste liquid. The mixing control unit may control the mixing ratio based on the water quality of the first waste liquid and the water quality of the second waste liquid measured by the water quality measuring unit.

The exhaust gas treatment apparatus may further include a flow rate measuring section that measures the flow rate of the second waste liquid, and a mixing ratio calculation section that calculates the mixing ratio of the first waste liquid and the second waste liquid. The mixing ratio calculation unit calculates the flow rate of the second waste liquid, the water quality of the first waste liquid and the water quality of the second waste liquid measured by the water quality measurement unit, the first waste liquid and the second waste liquid. The mixing ratio may be calculated based on the predetermined regulation value of the mixed waste liquid in which and are mixed at the mixing ratio.

The mixing control unit may control the mixing ratio based on the minimum water quality of the first waste liquid stored in the storage unit and the water quality of the second waste liquid measured by the water quality measuring unit.

The water quality measurement unit may measure the water quality of the mixed waste liquid. The mixing controller may further control the mixing ratio based on the water quality of the mixed waste liquid.

The exhaust gas treatment device includes an output measurement unit that measures the output of the power plant that discharges the exhaust gas, and a time acquisition unit that acquires the time after the switch control unit controls the waste liquid to be supplied to the reaction tower. and a water quality calculation section for calculating the water quality of the first waste liquid based on the output of the power plant measured by the output measurement section and the flow rate of the first waste liquid measured by the flow rate measurement section. Be prepared. The flow rate measurement unit may further measure the flow rate of the first drainage. The water quality calculation unit may calculate the minimum value of the water quality of the first waste liquid based on the output of the power plant, the flow rate of the first waste liquid, and the time.

The water quality calculation unit may calculate the minimum value of the water quality of the first waste liquid further based on at least one of the carbon concentration, ash concentration and sulfur concentration of the fuel consumed by the power plant.

The exhaust gas treatment device may further include a flow rate control section that controls the flow rate of the liquid based on the output of the power plant that discharges the exhaust gas. The flow rate controller may control the flow rate of the liquid to exceed the flow rate corresponding to the output of the power plant when the waste liquid is not supplied to the reaction column.

The flow control section may control the flow rate of the liquid to a flow rate corresponding to the output of the power unit when the waste liquid is supplied to the reaction column.

The water quality measurement unit may further measure the water quality of the liquid. The mixing control section may control the mixing ratio based on the water quality of the liquid and the water quality of the second waste liquid measured by the water quality measuring section.

The reactor may be mounted on a ship. The mixing control unit may control the mixing ratio further based on the ship's sailing schedule.

The ship is located in the first sea area where the regulation value for the water quality of the waste liquid discharged from the reaction tower is the first regulation value, and the second regulation value where the regulation value for the water quality of the waste water is the second regulation value that is looser than the first regulation value. May navigate 2 sea areas. The mixing control unit may control the mixing ratio further based on the time until the ship navigates through the first sea area while the ship is navigating the second sea area.

The exhaust gas treatment device may further include a flow control section that controls the flow rate of the liquid. The flow control unit may control the flow rate of the liquid based on the time until the ship navigates through the first sea area while the ship is navigating the second sea area.

Measured by the water quality measuring unit when the ship is sailing in the second sea area and the mixture control unit mixes the predetermined minimum amount of the first waste liquid with the second waste liquid. If the water quality of the first mixed wastewater obtained by mixing the minimum amount of the first wastewater and the second wastewater does not satisfy the second regulation value, The flow controller may increase the flow rate of the liquid.

The water quality measurement unit may include a turbidity measurement unit that measures the turbidity of the effluent, and a hydrocarbon concentration measurement unit that measures the polycyclic aromatic hydrocarbon concentration of the effluent. The mixing controller may control the mixing ratio based on at least one of the turbidity of the waste liquid and the polycyclic aromatic hydrocarbon concentration of the waste liquid.

When the ship is navigating the second sea area and the water quality of the second mixed effluent obtained by mixing the first effluent and the second effluent satisfies the second regulation value, the turbidity of the effluent The first difference between the water quality of the second mixed effluent when the mixing ratio is controlled based on one of the degree and the polycyclic aromatic hydrocarbon concentration of the effluent and the second regulation value is the turbidity of the effluent and the second difference between the water quality of the second mixed waste liquid when the mixing ratio is controlled based on the other of the polycyclic aromatic hydrocarbon concentration of the waste liquid and the second regulation value, the mixing control unit may control the mixing ratio based on one of the effluent turbidity and the effluent polycyclic aromatic hydrocarbon concentration.

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

It is a figure showing an example of exhaust gas treatment equipment 100 concerning one embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the block diagram of the waste gas treatment apparatus 100 which concerns on one Embodiment of this invention. It is a figure which shows another example of the block diagram of the exhaust gas treatment apparatus 100 which concerns on one Embodiment of this invention. It is a figure which shows another example of the block diagram of the exhaust gas treatment apparatus 100 which concerns on one Embodiment of this invention. It is a figure which shows another example of the block diagram of the exhaust gas treatment apparatus 100 which concerns on one Embodiment of this invention. 2 is a diagram showing an example of a route of ship 200. FIG. FIG. 4 is a diagram showing another example of a route of the ship 200;

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

FIG. 1 is a diagram showing an example of an exhaust gas treatment apparatus 100 according to one embodiment of the present invention. The exhaust gas treatment apparatus 100 includes a reaction tower 10 , a switching control section 74 , a storage section 73 , a water quality measurement section 98 and a mixing control section 75 . The exhaust gas treatment device 100 may include an exhaust gas introduction pipe 32 and a power plant 50 .

The power plant 50 is, for example, an engine, a boiler, or the like. Fuel 36 is supplied to power plant 50 . Fuel 36 may be a fossil fuel. The fuel 36 contains polycyclic aromatic hydrocarbons (PAHs). Polycyclic aromatic hydrocarbons are referred to herein as PAHs. Power plant 50 emits exhaust gas 30 containing PAH 37 by burning fuel 36 .

The flue gas introduction pipe 32 connects the power plant 50 and the reaction tower 10 . An exhaust gas 30 is supplied to the reaction tower 10 . In this example, the exhaust gas 30 discharged by the power plant 50 is supplied to the reaction tower 10 after passing through the exhaust gas introduction pipe 32 .

The exhaust gas 30 emitted by the power plant 50 contains, in addition to the PAHs 37, substances such as particulate matter (PM), nitrogen oxides ( _NOx ) and sulfur oxides ( _SOx ). Particulate matter 35 is also referred to as black carbon (BC). Particulate matter 35 is generated by incomplete combustion of fuel 36 . The particulate matter 35 is fine particles containing carbon as a main component. Particulate matter 35 is, for example, soot.

The reaction tower 10 may have an exhaust gas inlet 11 through which the exhaust gas 30 is introduced and an exhaust gas outlet 17 through which the exhaust gas 30 is discharged. The reactor 10 is supplied with a liquid 40 that treats the exhaust gas 30 . The liquid 40 supplied to the reaction tower 10 treats the exhaust gas 30 inside the reaction tower 10 . 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 . The liquid 40 becomes a waste liquid 46 after treating the exhaust gas 30 . Effluent 46 contains particulate matter 35 and PAHs 37 . The reaction tower 10 discharges a waste liquid 46 that has treated the exhaust gas 30 .

The reactor 10 of this example has a side wall 15 , a bottom 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 arranged at a position facing the bottom surface 16 in the direction parallel to the central axis of the columnar reaction tower 10 . In this example, sidewall 15 and bottom 16 are the inner and bottom surfaces, respectively, of cylindrical reactor 10 . The exhaust gas introduction port 11 may be provided in the side wall 15 . In this example, the exhaust gas 30 is introduced into the gas processing section 18 after passing through the exhaust gas introduction port 11 from the exhaust gas introduction pipe 32 .

Sidewalls 15 and bottom surface 16 are formed of materials that are resistant to exhaust gases 30 and liquids 40 and 46 . The material is a combination of iron materials such as SS400 and S-TEN (registered trademark) and at least one of coating agents and paint agents, copper alloys such as Nevar brass, aluminum alloys such as aluminum brass, and nickel alloys such as Cupronickel. , Hastelloy (registered trademark), SUS316L, SUS329J4L or SUS312.

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

The Z-axis direction may be parallel to the vertical direction. When the Z-axis direction is parallel to the vertical direction, 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 vertical direction.

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 moves in the direction from the exhaust gas introduction port 11 to the exhaust gas discharge port 17 (the Z-axis direction in this example) while swirling inside the reaction tower 10. . In this example, the exhaust gas 30 swirls in the XY plane when viewed in the direction from the exhaust gas outlet 17 to the bottom surface 16 .

The reactor 10 may have one or more main pipes 12 to which the liquid 40 is supplied and one or more branch pipes 13 . The reaction tower 10 may have one or more ejection parts 14 for ejecting the liquid 40 . In this example, the ejection part 14 is connected to the branch pipe 13 , and the branch pipe 13 is connected to the main pipe 12 .

The reaction column 10 of this example has three main pipes 12 (a main pipe 12-1, a main pipe 12-2 and a main pipe 12-3). In this example, the trunk pipe 12-1 and the trunk pipe 12-3 are the trunk pipes 12 provided closest to the exhaust gas introduction port 11 and closest to the exhaust gas discharge port 17, respectively, in the direction parallel to the Z axis. In this example, the trunk pipe 12-2 is the trunk pipe 12 provided between the trunk pipes 12-1 and 12-3 in the Z-axis direction.

The reaction tower 10 of this example includes branch pipes 13-1 to 13-12. In this example, the branch pipe 13-1 and the branch pipe 13-12 are the branch pipes 13 provided closest to the exhaust gas introduction port 11 side and closest to the exhaust gas discharge port 17 side, respectively, in the direction parallel to the Z axis. In this example, the branch pipe 13-1, the branch pipe 13-3, the branch pipe 13-5, the branch pipe 13-7, the branch pipe 13-9 and the branch pipe 13-11 extend in the Y-axis direction. -2, branch pipe 13-4, branch pipe 13-6, branch pipe 13-8, branch pipe 13-10 and branch pipe 13-12 extend in the X-axis direction.

In this example, the branch pipes 13-1 to 13-4 are connected to the main pipe 12-1, the branch pipes 13-5 to 13-8 are connected to the main pipe 12-2, and the branch pipes 13- 9 to branch pipe 13-12 are connected to main pipe 12-3. The branch pipe 13-1, the branch pipe 13-3, the branch pipe 13-5, the branch pipe 13-7, the branch pipe 13-9 and the branch pipe 13-11 are arranged on both sides of the main pipe 12 in the direction parallel to the Y axis. may be placed in The branch pipe 13-2, the branch pipe 13-4, the branch pipe 13-6, the branch pipe 13-8, the branch pipe 13-10 and the branch pipe 13-12 are located on both sides of the main pipe 12 in the direction parallel to the X axis. may be placed in

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

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

The reaction tower 10 of this example includes jetting sections 14-1 to 14-12. In this example, the ejection portion 14-1 and the ejection portion 14-12 are the ejection portions 14 provided closest to the exhaust gas introduction port 11 side and closest to the exhaust gas discharge port 17 side, respectively, in the direction parallel to the Z axis. The ejection portions 14-1 to 14-12 of this example are connected to the branch pipes 13-1 to 13-12, respectively. In one branch pipe 13 extending in the Y-axis direction, a plurality of ejection portions 14 may be provided on one side of the trunk pipe 12 in the direction parallel to the Y-axis, and a plurality of ejection portions 14 may be provided on the other side. can be In one branch pipe 13 extending in the X-axis direction, a plurality of ejection portions 14 may be provided on one side of the trunk pipe 12 in the direction parallel to the X-axis, and a plurality of ejection portions 14 may be provided on the other side. can be In FIG. 1, the ejection portion 14-1A, the ejection portion 14-3A, the ejection portion 14-5A, the ejection portion 14-7A, the ejection portion 14-9A, and the ejection portion 14-11A are positioned so as to overlap the main pipe 12. It is not shown because it is arranged.

The ejection part 14 has an opening surface through which the liquid 40 is ejected. In FIG. 1, the aperture plane is indicated by an "x" mark. In one branch pipe 13, the opening surfaces of the jetting portions 14 arranged on one side and the other side of the main pipe 12 extend in one direction and the other direction forming a predetermined angle with the extending direction of the branch pipe 13. You can point Taking the ejection part 14-2 as an example, in this example, the opening surface of the ejection part 14-2A arranged on one side of the trunk pipe 12-1 forms a predetermined angle with the branch pipe 13-2A. , and the opening surface of the ejection portion 14-2B arranged on the other side of the main pipe 12-1 points in one direction forming a predetermined angle with the branch pipe 13-2B.

The exhaust gas treatment device 100 may include a flow control section 70 . The flow control section 70 controls the flow rate of the liquid 40 supplied to the reaction tower 10 . The flow controller 70 may have a valve 72 . In this example, the flow rate control section 70 controls the flow rate of the liquid 40 supplied to the ejection section 14 by means of the valve 72 . The flow control unit 70 of this example includes three valves 72 (valve 72-1, valve 72-2 and valve 72-3). The flow control unit 70 of this example controls the flow rate of the liquid 40 supplied to the main pipes 12-1, 12-2 and 12-3 by the valves 72-1, 72-2 and 72-3, respectively. Control the flow rate. The liquid 40 supplied to the main pipe 12 passes through the branch pipe 13 and is then jetted from the jetting section 14 into the reaction tower 10 (gas processing section 18).

The flow control unit 70 may control the flow rate of the liquid 40 so that the flow rate of the liquid 40 supplied to the main pipe 12-1 is higher than the flow rate of the liquid 40 supplied to the main pipe 12-2. The flow control unit 70 may control the flow rate of the liquid 40 so that the flow rate of the liquid 40 supplied to the trunk pipe 12-2 is higher than the flow rate of the liquid 40 supplied to the trunk pipe 12-3. The ratio of the flow rate of the liquid 40 supplied to the main pipe 12-3, the flow rate of the liquid 40 supplied to the main pipe 12-2, and the flow rate of the liquid 40 supplied to the main pipe 12-1 is, for example, 1. :2:9.

The exhaust gas treatment device 100 may include an exhaust pipe 20 , an exhaust pipe 21 , a circulation pipe 22 , an inlet pipe 23 , an inlet pipe 24 and an outlet pipe 25 . The exhaust gas treatment device 100 may include a switching section 31 and a switching section 33 . The switching portion 31 and the switching portion 33 are, for example, three-way valves. The exhaust gas treatment device 100 may include an inlet pump 60 , a circulation pump 61 and an outlet pump 62 . In this example, the waste liquid 46 is discharged to the discharge pipe 20 after passing through the liquid discharge port 19 .

The discharge pipe 20 is connected to the reaction tower 10 and the switching section 31 . The discharge pipe 21 is connected to the switching section 31 . The circulation pipe 22 is connected to the switching section 31 and the switching section 33 . The introduction pipe 23 is connected to the switching section 33 . The introduction pipe 24 is connected to the switching section 33 and the reaction tower 10 . Outlet tube 25 is connected to reservoir 73 and discharge tube 21 .

The circulation pump 61 may be provided in the circulation pipe 22 . In this example, the drainage 46 flows through the inside of the circulation pipe 22 in the direction from the switching portion 31 to the switching portion 33 by the circulation pump 61 . The introduction pump 60 may be provided in the introduction pipe 23 . The liquid 40 introduced into the introduction pipe 23 flows to the switching section 33 . The outlet pump 62 may be provided in the outlet tube 25 . A valve 34 may be provided in the outlet tube 25 .

The exhaust gas treatment device 100 may include a supply section 76 . The replenishment part 76 replenishes the liquid 40 . The supply section 76 may supply the liquid 40 to the circulation pipe 22 .

The switching control unit 74 switches whether or not the waste liquid 46 is supplied to the reaction tower 10 . In this example, the switching control unit 74 controls the switching unit 31 to control whether the drainage 46 flowing through the discharge pipe 20 flows to the discharge pipe 21 or the circulation pipe 22 . In this example, the switching control unit 74 controls the switching unit 33 so that at least one of the liquid 40 and the waste liquid 46 flowing through the circulation pipe 22 flows into the introduction pipe 24, or the liquid 40 flowing through the introduction pipe 23 It controls whether or not it flows into the introduction pipe 24 .

The switching control unit 74 controls the switching unit 31 so that the drainage 46 flowing through the discharge pipe 20 flows into the circulation pipe 22, and at least one of the liquid 40 and the drainage 46 flowing through the circulation pipe 22 flows into the introduction pipe 24. You may control the switching part 33 so that it may flow. When the switching control section 74 controls the switching section 31 and the switching section 33 in this way, the liquid 40 and the waste liquid 46 circulate through the introduction pipe 24 , the reaction tower 10 , the discharge pipe 20 and the circulation pipe 22 . This circulation of liquid 40 and drain 46 is referred to herein as closed mode. A closed mode is also referred to as a closed loop mode.

The switching control unit 74 controls the switching unit 31 so that the drainage liquid 46 flowing through the discharge pipe 20 flows to the discharge pipe 21 , and the switching unit 33 so that the liquid 40 flowing through the introduction pipe 23 flows to the introduction pipe 24 . You can control it. When the switching control unit 74 controls the switching unit 31 and the switching unit 33 in this manner, in this example, the liquid 40 is introduced from the outside of the exhaust gas treatment device 100 (for example, the ocean), and the liquid 40 is introduced from the outside of the exhaust gas treatment device 100 (for example, A mixed waste liquid 47 (described later) is discharged into the ocean). In this specification, the case where the liquid 40 is introduced from the outside of the exhaust gas treatment apparatus 100 and the mixed waste liquid 47 (described later) is discharged outside the exhaust gas treatment apparatus 100 is referred to as an open mode. The open mode is also referred to as the open loop mode.

The switching control unit 74 of this example controls switching between the above-described closed mode and open mode. In the closed mode, liquid 40 and drain 46 may be circulated by the pressure of circulation pump 61 . In the open mode, liquid 40 may be introduced into reaction column 10 by the pressure of inlet pump 60 . The exhaust gas treatment device 100 that is used by switching between the closed mode and the open mode is also called a hybrid system.

In closed mode, effluent 46 is fed to reactor 10 . In the case of the closed system, the waste liquid 46 circulating through the introduction pipe 24, the reaction tower 10, the discharge pipe 20 and the circulation pipe 22 is referred to as a first waste liquid 46-1. In the open mode, effluent 46 is not fed to reactor 10 . In the case of the open mode, the waste fluid 46 flowing through the discharge pipes 20 and 21 is referred to as a second waste fluid 46-2.

As described above, the effluent 46 from treating the exhaust gas 30 contains particulate matter 35 and PAHs 37 . Let the concentration of the particulate matter 35 in the waste liquid 46 be Dc, and let the concentration of PAHs 37 be Dp. Let the concentration of the particulate matter 35 in the first drainage 46-1 be the concentration Dc1, and let the concentration of the PAHs 37 be the concentration Dp1. Let the concentration of the particulate matter 35 in the second drainage 46-2 be the concentration Dc2. The concentration of PAH37 is assumed to be Dp2.

In the closed mode, the density Dc1 and the density Dp1 tend to increase with the passage of time. In the open mode, the density Dc2 and the density Dp2 are less likely to increase over time. At the time when switching control unit 74 switches switching units 31 and 33 from the open mode to the closed mode, density Dc1 and density Dc2 may be the same, and density Dp1 and density Dp2 may be the same. good. After the switching control unit 74 switches the switching unit 31 and the switching unit 33 from the open mode to the closed mode, the density Dc1 tends to be higher than the density Dc2, and the density Dp1 tends to be higher than the density Dp2. .

The exhaust gas treatment device 100 may include a cleaning agent input portion 77 . The exhaust gas 30 contains harmful substances such as sulfur oxides (SO _x ). Sulfur oxide (SO _x ) is, for example, sulfurous acid gas (SO ₂ ). The cleaning agent injection unit 77 introduces a cleaning agent 78 for removing at least part of the harmful substances from the exhaust gas 30 into at least one of the waste fluid 46 and the liquid 40 .

Purifier 78 may be a magnesium compound, a sodium compound, and/or a calcium compound. The cleaning agent 78 is at least one of magnesium hydroxide (Mg(OH) ₂ ), magnesium oxide (MgO), sodium hydroxide (NaOH), sodium hydrogen carbonate (Na ₂ CO ₃ ) and calcium carbonate (CaCO ₃ ). can be

In the case of the closed mode, the cleaning agent injection unit 77 may introduce the cleaning agent 78 into the first drainage liquid 46-1 flowing through the circulation pipe 22. FIG. In the case of the open mode, the cleaning agent injection part 77 may introduce the cleaning agent 78 into the liquid 40 flowing through the introduction pipe 24 .

When the cleaning agent 78 is put into the first waste liquid 46-1 and the cleaning agent 78 is sodium hydroxide (NaOH), the first waste liquid 46-1 becomes an aqueous sodium hydroxide (NaOH) solution. The first waste liquid 46-1 is introduced into the introduction pipe 24 by the circulation pump 61, and then ejected from the ejection section 14 into the reaction tower 10 (gas processing section 18). The reaction of the first waste liquid 46-1 and the sulfurous acid gas (SO ₂ ) in the gas processing section 18 is represented by [Chemical Formula 1] and [Chemical Formula 2] below.
[Chemical Formula 1]
SO ₂ +H ₂ O→HSO ₃ ⁻ +H ⁺
[Chemical Formula 2]
HSO ₃ ⁻ +H ⁺ +2NaOH→Na ₂ SO ₄ +H ₂ O

As shown in [Chemical Formula 1], sulfurous acid gas (SO ₂ ) becomes hydrogen sulfite ions (HSO ₃ ⁻ ) through a chemical reaction. The first waste liquid 46-1 becomes an aqueous solution containing hydrogen sulfite ions (HSO ₃ ⁻ ) through this chemical reaction. The first waste liquid 46-1 may be discharged from the interior of the reaction tower 10 to the discharge pipe 20. In the case of the closed mode, the first waste liquid 46-1 is introduced into the introduction pipe 24 and then jetted from the jetting section 14 into the reaction tower 10 again. At least part of the hydrogen sulfite ion (HSO ₃ ⁻ ) contained in the aqueous solution of hydrogen sulfite ion (HSO ₃ ⁻ ) is converted into sodium sulfate (Na ₂ SO ₄ ) and water (H ₂ O). A sodium sulfate (Na ₂ SO ₄ ) aqueous solution contains sulfate ions (SO ₄ ²⁻ ).

In this specification, at least one of hydrogen sulfite ion (HSO ₃ ⁻ ) and sulfate ion (SO ₄ ²⁻ ) is referred to as sulfur oxide ion. In the closed mode, the first drain 46-1 repeats the chemical reactions shown in [Chemical Formula 1] and [Chemical Formula 2] above. Therefore, the concentration of sulfur oxide ions contained in the first waste liquid 46-1 tends to increase as the first waste liquid 46-1 circulates. When the concentration of sulfur oxide ions contained in the first waste liquid 46-1 increases, it becomes difficult for the first waste liquid 46-1 to remove harmful substances contained in the exhaust gas 30. FIG.

The reservoir 73 may be connected to the circulation pipe 22 . The storage part 73 stores the first drainage 46-1. The storage section 73 may store a portion of the first drainage 46-1. This part of the first drainage 46-1 is, for example, the withdrawal water, so-called bleed-off water. The supply unit 76 may supply the first drainage 46-1 with an amount of the liquid 40 equal to the amount of the part of the first drainage 46-1. This makes it easier to suppress an increase in the concentration Dc1 of the particulate matter 35, an increase in the concentration Dp1 of the PAHs 37, and an increase in the concentration of sulfur oxide ions in the first waste liquid 46-1.

A water quality measurement unit 98 measures the water quality of the drainage 46 . The water quality of the waste liquid 46 is assumed to be water quality Q. As shown in FIG. In this example, the water quality measuring unit 98 measures the water quality of the waste liquid 46 using a water quality sensor 99 . The water quality sensor 99 may be at least one of a turbidity sensor and an oil content sensor. In this example, the water quality sensor 99 is provided on the discharge pipe 20 . The water quality Q of the waste liquid 46 may be at least one of the turbidity of the waste liquid 46 and the concentration of PAH37. The higher the concentration of particulate matter 35 in the effluent 46, the higher the turbidity of the effluent 46. The water quality Q of the effluent 46 may refer to the concentration of the particulate matter 35 in the effluent 46 .

The water quality measurement unit 98 may measure the water quality Q of the first drainage 46-1 in the closed mode. The water quality Q of the first drainage 46-1 is assumed to be water quality Q1. The water quality measurement unit 98 measures the water quality of the second drainage 46-2 in the open mode. The water quality Q of the second drainage 46-2 is assumed to be water quality Q2. In this specification, the high water quality Q means that at least one of the turbidity of the waste liquid 46 and the concentration of PAH37 is low, and the low water quality Q means that at least one of the turbidity of the waste liquid 46 and the concentration of PAH37 Indicates that one side is higher.

The regulation values for turbidity and PAH concentration of scrubber wastewater discharged from ships into the sea are set by the International Maritime Organization (IMO). Let the regulation value be the regulation value R. The regulation value R varies depending on the sea area, but in the most severe sea area, the turbidity regulation value R is 25 NTU (Nephlometric Turbidity Units) or 25 FNU (Formazin Nephlometric Units) or less (as of 2021) when discharged overboard, and the PAH concentration is 50 μg/L or less (as of 2021).

Since the second waste liquid 46-2 does not circulate through the introduction pipe 24, the reaction tower 10, the discharge pipe 20 and the circulation pipe 22, the water quality Q2 easily satisfies the regulation value R. The turbidity of the second drainage 46-2 is, for example, 4 NTU or more and 8 NTU or less. Since the first waste liquid 46-1 circulates through the introduction pipe 24, the reaction tower 10, the discharge pipe 20 and the circulation pipe 22, the water quality Q1 tends not to satisfy the regulation value R. That is, the water quality Q1 tends to be lower than the water quality Q2. The turbidity of the first drainage 46-1 is, for example, 1000 NTU.

The user of the exhaust gas treatment apparatus 100 cannot discharge the first waste liquid 46-1 to the outside of the exhaust gas treatment apparatus 100 with the water quality Q1 that does not satisfy the regulation value R. Therefore, the first waste liquid 46 - 1 of water quality Q 1 that does not satisfy the regulation value R is stored in the storage section 73 . Since the first waste liquid 46-1 circulates through the introduction pipe 24, the reaction tower 10, the discharge pipe 20, and the circulation pipe 22, the amount of the first waste liquid 46-1 stored in the reservoir 73 is It tends to increase over time.

The first drainage 46 - 1 stored in the reservoir 73 may be drawn out from the reservoir 73 by the lead-out pump 62 . In the case of the open mode, the first drainage liquid 46-1 drawn by the outlet pump 62 may be introduced into the outlet pipe 21. As shown in FIG. The first waste liquid 46-1 introduced into the discharge pipe 21 becomes a mixed waste liquid 47 by being mixed with the second waste liquid 46-2. The water quality Q of the mixed waste liquid 47 is assumed to be water quality Q3. When the water quality Q1 is lower than the water quality Q2, the water quality Q3 tends to be higher than the water quality Q1. Therefore, the mixed waste liquid 47 more easily satisfies the regulation value R than the first waste liquid 46-1.

As the first waste liquid 46-1 is discharged from the storage section 73, the amount of the first waste liquid 46-1 stored in the storage section 73 decreases. As a result, the first drainage liquid 46-1 stored in the storage section 73 is suppressed from reaching the maximum capacity of the storage section 73, or the first drainage liquid 46-1 reaches the storage section 73. It takes longer to reach maximum capacity.

Let flow rate L be the flow rate of the drain 46 . The flow rate L may be the volume or mass of the effluent 46 flowing per unit time. Let the flow rate L of the first drainage 46-1 introduced from the reservoir 73 into the discharge pipe 21 be the flow rate L1. Let the flow rate L2 of the liquid 40 and the flow rate L of the second drain 46-2.

The mixing control unit 75 controls the mixing ratio of the second waste liquid 46-2 and the first waste liquid 46-1 stored in the storage unit 73 based on the water quality Q2. As a result, the water quality Q3 of the mixed waste liquid 47 easily satisfies the regulation value R. This mixing ratio is referred to as a mixing ratio Mr. The mixing ratio Mr may be the ratio (L1/L2) of the flow rate L1 of the first waste liquid 46-1 to the flow rate L2 of the second waste liquid 46-2. The mixing control unit 75 may control the mixing ratio Mr so that the water quality Q3 satisfies the regulation value R.

As described above, the water quality Q1 tends to be lower than the water quality Q2. Therefore, the flow rate L2 may be greater than the flow rate L1. The flow rate L2 may be 10 times or more, 50 times or more, or 100 times or more the flow rate L1. The flow rate L2 may be constant. When the flow rate L2 is constant, the mixing control section 75 may control the mixing ratio Mr by controlling the flow rate L1. The mixing control section 75 may control the flow rate L1 with the valve 34 . The mixing control unit 75 may control the flow rate L1 based on the water quality Q2 and the flow rate L2.

FIG. 2 is a diagram showing an example of a block diagram of the exhaust gas treatment device 100 according to one embodiment of the present invention. FIG. 2 shows details of the reservoir 73 in the exhaust gas treatment apparatus 100 shown in FIG. In FIG. 2, the discharge pipe 20, the discharge pipe 21, the circulation pipe 22, the introduction pipe 23, the introduction pipe 24 and the discharge pipe 25 in FIG. 1 are indicated by thick solid lines. In FIG. 2, the valves 72-1 to 72-3 in FIG. 1 are collectively shown as one valve 72. As shown in FIG. 2, illustration of the introduction pump 60 and the circulation pump 61 shown in FIG. 1 is omitted. The exhaust gas treatment apparatus 100 of this example differs from the exhaust gas treatment apparatus 100 shown in FIG.

The exhaust gas treatment device 100 may include a water storage section 80 , a separation section 81 , a first storage section 82 and a second storage section 83 . Reservoir 73 shown in FIG. 1 may include water reservoir 80 , separation section 81 , first reservoir 82 and second reservoir 83 . In this example, the water reservoir 80 stores the first drainage 46-1. The water reservoir 80 may be provided in the circulation pipe 22 . In addition, in this example, the supply unit 76 is connected to the water storage unit 80 . The supply section 76 may supply the liquid 40 to the water storage section 80 .

In this example, the separation unit 81 is introduced with the first waste liquid 46-1 containing the particulate matter 35 and the PAHs 37. As shown in FIG. The separation unit 81 separates the particulate matter 35 from the moisture contained in the first drainage 46-1. In this example, the first drainage 46 - 1 stored in the water storage section 80 is introduced into the separation section 81 . The water storage section 80 may introduce at least part of the first drainage 46-1 introduced into the water storage section 80 from the circulation pipe 22 into the separation section 81. As shown in FIG.

A flocculant 79 that agglomerates the particulate matter 35 may be introduced into the separation section 81 . The coagulant 79 includes iron chloride (FeCl ₂ ), iron sulfide (FeS), calcium sulfate (CaSO ₄ ), aluminum sulfate (Al ₂ (SO ₄ ) _{3.16H 2} O), polyaluminum chloride (so-called PAC), cation It may be at least one of polymer flocculants such as system, nonionic and anionic systems.

In this example, at least a portion of the drainage 46 separated by the separation section 81 is introduced into the first storage section 82 . The first storage section 82 stores the first drainage 46-1 from which at least part of the particulate matter 35 has been removed. In this example, at least part of the particulate matter 35 separated by the separation section 81 is introduced into the second storage section 83 . The second storage section 83 stores the particulate matter 35 from which at least part of the first drainage 46-1 has been removed.

The concentration Dc1 of the particulate matter 35 in the first drainage 46-1 stored in the first storage section 82 is the concentration of the particulate matter 35 in the first drainage 46-1 stored in the second storage section 83. It is smaller than the density Dc1. The first storage part 82 may be a storage tank in which the waste liquid 46 containing the particulate matter 35 is stored. The first drainage 46-1 stored in the first storage section 82 may be the above-described so-called bleed-off water. The second reservoir 83 may be a sludge tank in which the particulate matter 35 including the waste fluid 46 is stored.

In this example, the water quality sensor 99-1 is provided on the discharge pipe 20. FIG. The water quality sensor 99-1 detects the water quality Q2 of the second drainage 46-2 in the open mode. The water quality measuring section 98 may further measure the water quality Q1 of the first drainage 46-1. In this example, the water quality measuring unit 98 measures the water quality Q1 of the first drainage 46-1 led out from the first storage unit 82. As shown in FIG. In this example, the water quality measuring unit 98 measures the water quality Q1 using the water quality sensor 99-2.

The mixing control section 75 may control the mixing ratio Mr based on the water quality Q1 and the water quality Q2 measured by the water quality measuring section 98 . As a result, the water quality Q3 of the mixed waste liquid 47 easily satisfies the regulation value R.

The flow rate measurement unit 71 measures the flow rate L2 of the second drainage 46-2. In this example, the flow rate measurement unit 71 measures the flow rate L2 using the flow rate sensor 69 . In this example, the flow rate sensor 69 is provided on the discharge pipe 21 . The mixing ratio calculator 92 calculates the mixing ratio Mr between the first waste liquid 46-1 and the second waste liquid 46-2.

The mixing ratio calculator 92 calculates the flow rate L2 of the second waste liquid 46-2, the water quality Q1 of the first waste liquid 46-1, the water quality Q2 of the second waste liquid 46-2, and the mixed waste liquid 47. The mixing ratio Mr may be calculated based on the predetermined regulation value R of water quality. The mixing ratio Mr may be the ratio (L1/L2) of the flow rate L1 to the flow rate L2, as described above.

混合制御部７５は、混合割合Ｍｒを、混合割合演算部９２により演算された混合割合Ｍｒに制御してよい。流量Ｌ２が一定である場合、混合割合演算部９２は、式（１）により流量Ｌ１を演算してよい。流量Ｌ１が一定である場合、混合割合演算部９２は、式（１）により流量Ｌ２を演算してよい。 The mixing ratio calculator 92 may calculate the mixing ratio Mr by the following formula (1).

The mixture controller 75 may control the mixture ratio Mr to the mixture ratio Mr calculated by the mixture ratio calculator 92 . When the flow rate L2 is constant, the mixing ratio calculation section 92 may calculate the flow rate L1 by Equation (1). When the flow rate L1 is constant, the mixing ratio calculation unit 92 may calculate the flow rate L2 by Equation (1).

FIG. 3 is a diagram showing another example of a block diagram of the exhaust gas treatment device 100 according to one embodiment of the present invention. The exhaust gas treatment apparatus 100 of this example further includes an output measurement unit 52, a time acquisition unit 91, a flow rate sensor 69-2, a water quality sensor 99-3, and a water quality calculation unit 90. different from

In this example, the flow rate sensor 69-2 is provided in the circulation pipe 22. As shown in FIG. The flow sensor 69-1 is the flow sensor 69 shown in FIG.

Output measurement unit 52 measures the output of power plant 50 . Let this output be the output P. The flow rate measurement unit 71 may measure the flow rate of the first drainage 46-1 in the closed mode. Let this flow rate be the flow rate L1′. In this example, the flow rate measurement unit 71 measures the flow rate L1' by the flow rate sensor 69-2.

The time acquisition unit 91 acquires the time since the switching control unit 74 controlled the waste liquid 46 to be supplied to the reaction tower 10 . Let this time be time T1. The time T1 from when the waste liquid 46 is controlled to be supplied to the reaction tower 10 refers to the time from when the open mode is changed to the closed mode. In this example, it indicates the time from when the switching control unit 74 starts controlling the switching units 31 and 33 from the closed mode to the open mode.

The water quality calculator 90 calculates the water quality Q1 of the first waste liquid 46-1 based on the output P, the flow rate L1' and the time T1. The amounts of PAHs 37 and particulate matter 35 contained in the exhaust gas 30 tend to depend on the power P. The amounts of PAHs 37 and particulate matter 35 contained in the first drainage 46-1 are likely to depend on the time T1. Therefore, the water quality calculator 90 can calculate the water quality Q1 based on the output P, the flow rate L1' and the time T1. The water quality calculator 90 is, for example, a PLC (Programmable Logic Controller). The water quality calculator 90 may calculate the minimum value of the water quality Q1 based on the output P, the flow rate L1' and the time T1.

The mixing control unit 75 controls the mixing ratio Mr based on the minimum value of the water quality Q1 of the first waste liquid 46-1 stored in the storage unit 73 and the water quality Q2 of the second waste liquid 46-2. You can In this example, the mixing control unit 75 controls the mixing ratio Mr based on the minimum value of the water quality Q1 stored in the first storage part 82 and the water quality Q2. In the case of the closed mode, the water quality Q1 tends to decrease over time. The water quality Q1 may be calculated by the water quality calculator 90, and may be a predetermined value. The predetermined value may be the lowest water quality Q1 assumed when the closed mode is continued. The predetermined value is, for example, 1000 NTU (Nephlometric Turbidity Units) or 1000 FNU (Formazin Nephlometric Units). When the mode is changed to the open mode after the closed mode, the mixing control unit 75 is opened based on the water quality Q1 and the water quality Q2 of the first waste liquid 46-1 stored in the first storage part 82. The mixing ratio Mr in the modality may be controlled.

In this example, the mixing control unit 75 controls the mixing ratio Mr based on the minimum value of the water quality Q1 stored in the first storage unit 82 and the water quality Q2. Therefore, the water quality Q3 of the mixed waste liquid 47 easily satisfies the regulation value R.

The water quality calculator 90 may calculate the minimum value of the water quality Q1 based on the maximum value of the output P. The amount of PAHs 37 and particulate matter 35 contained in the exhaust gas 30 tends to increase as the output P of the power plant 50 increases. Therefore, the water quality calculator 90 can calculate the minimum value of the water quality Q1 based on the maximum value of the output P.

The water quality calculation unit 90 may calculate the minimum value of the water quality Q1 based on the maximum value of the output P and at least one of the carbon concentration, ash concentration and sulfur concentration of the fuel 36 consumed by the power plant 50. . The amount of PAHs 37 and particulate matter 35 contained in exhaust gas 30 tends to depend on at least one of carbon concentration, ash concentration and sulfur concentration of fuel 36 . Therefore, the water quality calculator 90 can calculate the minimum value of the water quality Q1 based on the maximum value of the output P and at least one of the carbon concentration, ash concentration and sulfur concentration of the fuel 36 . The fuel 36 is C heavy oil, for example.

The water quality sensor 99-3 detects the water quality Q3 of the mixed waste liquid 47. FIG. In this example, the water quality measuring unit 98 measures the water quality Q3 using the water quality sensor 99-3. The water quality measuring unit 98 measures the water quality Q3 of the mixed waste liquid 47 in which the first waste liquid 46-1 and the second waste liquid 46-2 are mixed at the mixing ratio Mr.

The mixing control unit 75 may control the mixing ratio Mr based on the minimum value of the water quality Q1, the water quality Q2, and the water quality Q3 of the mixed waste liquid 47. FIG. If the mixture ratio Mr is controlled based on the minimum value of the water quality Q1 and the water quality Q2, the water quality Q3 is highly likely to satisfy the regulation value R. When the mixing control unit 75 controls the mixing ratio Mr further based on the water quality Q3, the water quality Q3 of the mixed waste liquid 47 tends to satisfy the regulation value R more reliably.

The flow rate control section 70 may control the flow rate L2 of the liquid 40 based on the output P of the power plant 50 . The mixing control unit 75 may control the mixing ratio Mr by causing the flow control unit 70 to control the flow rate L2. The flow control unit 70 may control the flow rate L2 of the liquid 40 to exceed the flow rate corresponding to the output P when the waste liquid 46 is not supplied to the reaction tower 10 . The flow rate L2 corresponding to the output P is defined as a flow rate L2f, and the flow rate L2 exceeding the flow rate L2f is defined as a flow rate L2m. The case where the waste liquid 46 is not supplied to the reaction column 10 refers to the case of the open mode.

Since the amount of PAHs 37 and particulate matter 35 contained in the exhaust gas 30 tends to increase as the output P increases, the flow rate L2 tends to increase as the output P increases. The output P and the flow rate L2 may be in a correlation. A correlation between the output P and the flow rate L2 may be calculated in advance. The correlation between the output P and the flow rate L2 may be a correlation calculated by the method of least squares from a plurality of measured values of the output P2 and a plurality of measured values of the flow rate L2. The flow rate L2f corresponding to the output P may be one flow rate L2 calculated based on the correlation when the output P is one output P.

When the flow rate L2 is the flow rate L2f, the flow rate L1 of the waste fluid 46-1 led out from the first reservoir 82 is defined as the flow rate L1f. When the flow rate L2 is the flow rate L2m, the flow rate L1 of the drainage liquid 46-1 led out from the first reservoir 82 is assumed to be the flow rate L1m. In this example, in the open mode, the flow rate L2 of the liquid 40 is controlled to a flow rate L2m exceeding the flow rate L2f. Therefore, when the flow rate L2 is controlled to the flow rate L2m and the mixing ratio Mr is maintained, the flow rate L1m tends to be larger than the flow rate L1f. That is, the discharge pump 62 can discharge a larger amount of the first drainage liquid 46-1 from the first reservoir 82. As shown in FIG. As a result, the first drainage liquid 46-1 stored in the first storage section 82 is suppressed from reaching the maximum capacity of the first storage section 82, or the first drainage liquid 46-1 is The time to reach the maximum capacity of the first reservoir 82 is lengthened.

The flow control unit 70 may control the flow rate L2 of the liquid 40 to a flow rate L2f corresponding to the output P of the power unit 50 when the waste liquid 46 is supplied to the reaction tower 10 . The case where the effluent 46 is supplied to the reaction column 10 refers to the closed mode. In the closed mode, the lead-out pump 62 does not lead out the first drain 46-1, so the flow controller 70 may control the flow rate L2 of the liquid 40 to the flow rate L2f.

FIG. 4 is a diagram showing another example of a block diagram of the exhaust gas treatment device 100 according to one embodiment of the present invention. The exhaust gas treatment apparatus 100 of this example differs from the exhaust gas treatment apparatus 100 shown in FIG. 3 in that it further includes a water quality sensor 99-4. A water quality sensor 99 - 4 detects the water quality of the liquid 40 . In this example, the water quality sensor 99-4 is provided on the introduction pipe . The water quality of the liquid 40 is assumed to be water quality Q4. The water quality measurement unit 98 measures the water quality Q4 of the liquid 40 . In this example, the water quality measuring unit 98 measures the water quality Q4 using the water quality sensor 99-4.

The mixing control unit 75 may control the mixing ratio Mr based on the water quality Q4 and the water quality Q2 of the second waste liquid 46-2. As described above, the liquid 40 becomes the effluent 46 by treating the exhaust gas 30 . Therefore, the water quality Q2 tends to depend on the water quality Q4. Therefore, by controlling the mixing ratio Mr based on the water quality Q4 and the water quality Q2, the water quality Q3 easily satisfies the regulation value R.

FIG. 5 is a diagram showing another example of a block diagram of the exhaust gas treatment device 100 according to one embodiment of the present invention. In this example, the water quality measuring section 98 includes a turbidity measuring section 96 and a hydrocarbon concentration measuring section 97 . The turbidity measurement unit 96 measures the turbidity of the drainage 46 . A hydrocarbon concentration measurement unit 97 measures the concentration of polycyclic aromatic hydrocarbons (PAHs) in the waste liquid 46 .

The mixing control unit 75 determines the mixing ratio Mr may be controlled. The mixing control unit 75 may control the mixing ratio Mr based on at least one of the turbidity and PAH concentration of the second waste liquid 46-2.

FIG. 6 is a diagram showing an example of the route of the ship 200. As shown in FIG. In this example, the reactor 10 is mounted on a ship 200 . In this example, the ship 200 is scheduled to anchor at port B after leaving port A, and to arrive at port C after leaving port B.

The mixing control unit 75 (see FIGS. 1 to 5) may control the mixing ratio Mr further based on the sailing schedule of the ship 200. FIG. The regulation value R of the turbidity and PAH concentration of the scrubber wastewater discharged from the ship 200 to the sea may depend on the sea area. The mixture control unit 75 may control the mixture ratio Mr based on the regulation value R of the sea area where the vessel 200 is scheduled to navigate. Thereby, the mixture control unit 75 can control the mixture ratio Mr more appropriately than when the mixture ratio Mr is controlled without being based on the regulation value R.

FIG. 7 is a diagram showing another example of the route of the ship 200. As shown in FIG. In this example, the vessel 200 navigates through the first sea area A1 and the second sea area A2. In this example, the vessel 200 navigates through the first area A1, then through the second area A2, and after navigating the second area A2, navigates through the first area again. In this example, ship 200 is assumed to be navigating second sea area A2. In FIG. 7, the route of the ship 200 is indicated by arrows. The regulation value R of the turbidity and PAH concentration of the waste liquid 46-2 in the first sea area A1 is defined as a first regulation value R1, and the regulation value R in the second sea area A2 is defined as a second regulation value R2. In this example, the second regulation value R2 is looser than the first regulation value R1.

While the vessel 200 is navigating the first sea area A1, the switching control section 74 (see FIGS. 1 to 5) may control the switching section 31 and the switching section 33 to the closed mode. While the vessel 200 is navigating the second sea area A2, the switching control section 74 may control the switching section 31 and the switching section 33 to open mode.

The mixing control unit 75 (see FIGS. 1 to 5) controls the mixing ratio Mr further based on the time until the ship 200 navigates through the first sea area A1 while the ship 200 is navigating the second sea area A2. you can Let this time be time T2. While the ship 200 is navigating the first sea area A1, the storage portion 73 stores the first drainage 46-1. While the ship 200 is navigating the second sea area A2, the storage portion 73 stores the first drainage liquid 46-1. The first drainage liquid 46-1 is the drainage liquid 46 discharged while the ship 200 was navigating the first sea area A1 before navigating the second sea area A2.

Since the first regulation value R1 is stricter than the second regulation value R2, after the vessel 200 navigates through the second sea area A2 and before it navigates through the first sea area A1 again, the reservoir 73 (see FIGS. 1 to 5) It is preferable that the amount of the first drainage liquid 46-1 stored in the tank is as small as possible. In this example, the mixing control unit 75 (see FIGS. 1 to 5) controls the mixing ratio Mr based on the time T2 until the vessel 200 navigates through the first sea area A1. Depending on the length of time T2, the mixing ratio Mr between the first and second waste liquids 46-1 and 46-2 can be controlled to the optimum mixing ratio Mr. The mixing control unit 75 may decrease the mixing ratio Mr as the time T2 is longer, and may increase the mixing ratio Mr as the time T2 is shorter.

While the ship 200 is navigating the second sea area A2, the mixing control unit 75 controls the mixing ratio Mr based on the time T2, and the flow control unit 70 (see FIGS. 1 to 5) controls the liquid based on the time T2. 40 flow rate L2 may be controlled. As described above, the flow rate L1 of the first waste liquid 46-1 that can be discharged by the discharge pump 62 (see FIGS. 1-5) depends on the flow rate L2 of the liquid 40. FIG. Therefore, the flow control unit 70 controls the flow rate L2 of the liquid 40 and the mixing control unit 75 controls the mixing ratio Mr, thereby making it easier to optimally control the mixing ratio Mr.

When the mixing control unit 75 controls the mixing ratio Mr based on the water quality Q1 of the first waste liquid 46-1 and the water quality Q2 of the second waste liquid 46-2, The mixing ratio Mr may be controlled by controlling the flow rate L1 of the first waste liquid 46-1 while controlling the flow rate L2 to be constant. When the water quality Q1 is the minimum value described above, the flow rate L1 of the first waste liquid 46-1 may be a predetermined minimum amount. Let the predetermined minimum amount be the minimum amount Lmin. The mixing control unit 75 may control the mixing ratio Mr between the second waste liquid 46-2 and the first waste liquid 46-1 of the minimum amount Lmin.

A mixed waste liquid obtained by mixing the minimum amount Lmin of the first waste liquid 46-1 and the second waste liquid 46-2 is defined as a first mixed waste liquid Lm1. The water quality Q of the first mixed waste liquid Lm1 measured by the water quality measuring unit 98 is assumed to be water quality Qm1.

When the vessel 200 is navigating the second sea area A2 and the mixture control unit 75 mixes the minimum amount Lmin of the first waste liquid 46-1 with the second waste liquid 46-2, If the water quality Qm1 of the first mixed waste liquid Lm1 measured by the water quality measuring section 98 does not satisfy the second regulation value R2, the flow rate control section 70 may increase the flow rate L2 of the liquid 40 . When the flow rate L1 of the first waste liquid 46-1 is maintained at the minimum amount Lmin and the flow rate L2 of the liquid 40 increases, the mixing ratio Mr (ie (L1/L2)) tends to decrease. That is, the turbidity of the first mixed waste liquid Lm1 and the concentration of PAH37 tend to decrease. This makes it easier for the water quality Qm1 of the first mixed waste liquid Lm1 to satisfy the second regulation value R2.

A mixed waste liquid in which the first waste liquid 46-1 and the second waste liquid 46-2 are mixed, and the mixed waste liquid is mixed so that the water quality Q of the mixed waste liquid satisfies the second regulation value R2. Let the discharged liquid be the second mixed discharged liquid Lm2. The water quality Q of the second mixed waste liquid Lm2 is assumed to be water quality Qm2.

The first when the mixing ratio Mr is controlled based on one of the turbidity of the waste liquid 46 and the PAH concentration of the waste liquid 46 (turbidity in this example) and the other (PAH concentration in this example) The water quality Qm2 of the two-mixed waste liquid Lm2 is assumed to be water quality Qm2-1 and water quality Qm2-2, respectively. A difference between the water quality Qm2-1 and the second regulation value R2 is defined as a first difference D1. A difference between the water quality Qm2-2 and the second regulation value R2 is defined as a second difference D2.

When the vessel 200 is navigating the second sea area A2 and the first difference D1 is smaller than the second difference D2, the mixing control unit 75 controls one of the turbidity of the waste liquid 46 and the PAH concentration of the waste liquid 46. The mixing ratio Mr may be controlled based on (turbidity in this example). When the first difference D1 is smaller than the second difference D2, in this example, the turbidity of the waste liquid 46 is closer to the second regulation value R2 than the PAH concentration. For this reason, the turbidity of the second mixed waste liquid Lm2 is more likely to fail to satisfy the second regulation value R2 than the PAH concentration. Therefore, by controlling the mixing ratio Mr based on one of the turbidity of the waste liquid 46 and the PAH concentration of the waste liquid 46 (the turbidity in this example), the second mixed waste liquid Lm2 becomes the second regulation. Failure to satisfy the value is more likely to be suppressed.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the description of the scope of claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

The execution order of each process such as actions, procedures, steps, and stages in the devices, systems, programs, and methods shown in the claims, the specification, and the drawings is particularly "before", "before etc., and it should be noted that they can be implemented in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the specification, and the drawings, even if the description is made using "first," "next," etc. for the sake of convenience, it means that it is essential to carry out in this order. not a thing

DESCRIPTION OF SYMBOLS 10... Reaction tower, 11... Exhaust gas inlet, 12... Main pipe, 13... Branch pipe, 14... Ejection part, 15... Side wall, 16... Bottom surface, 17. Exhaust gas outlet 18 Gas processing unit 19 Liquid outlet 20 Discharge pipe 21 Discharge pipe 22 Circulation pipe 23 Introduction pipe 24... Introduction pipe, 25... Lead pipe, 30... Exhaust gas, 31... Switching part, 32... Exhaust gas introduction pipe, 33... Switching part, 34... Valve, 35... Particulate Matter 36 Fuel 37 PAH 40 Liquid 46 Drain 47 Mixed Drain 50 Power Unit 52 Output measuring unit 60 Introduction pump 61 Circulation pump 62 Leading pump 69 Flow sensor 70 Flow control unit 71 Flow measurement unit 72 ... valve, 73 ... reservoir, 74 ... switching control section, 75 ... mixing control section, 76 ... supply section, 77 ... cleaning agent input section, 78 ... cleaning agent, 79... flocculating agent, 80... water storage section, 81... separation section, 82... first storage section, 83... second storage section, 90... water quality calculation section, 91... Time acquisition unit 92 Mixing ratio calculation unit 96 Turbidity measurement unit 97 Hydrocarbon concentration measurement unit 98 Water quality measurement unit 99 Water quality sensor 100. .. Exhaust gas treatment device, 200 .. Ship

Claims (16)

a reaction tower supplied with an exhaust gas discharged by a power plant and a liquid for treating the exhaust gas, and for discharging a waste liquid after treating the exhaust gas;
a switching control unit for switching whether the waste liquid is supplied to the reaction tower;
a storage unit that stores the drainage;
a water quality measuring unit that measures the water quality of the waste liquid;
a mixing control unit;
with
The reaction tower discharges the first waste liquid after treating the exhaust gas when the waste liquid is supplied to the reaction tower, and the waste gas is discharged when the waste liquid is not supplied to the reaction tower. discharging the treated second said effluent;
The reservoir stores the first drainage liquid,
The mixing control unit mixes the second waste liquid with the first waste liquid stored in the storage unit based on the water quality of the second waste liquid measured by the water quality measuring unit. to control the proportion,
Exhaust gas treatment equipment. The water quality measuring unit further measures the water quality of the first waste liquid,
The mixing control unit controls the mixing ratio based on the water quality of the first waste liquid and the water quality of the second waste liquid measured by the water quality measuring unit.
The exhaust gas treatment apparatus according to claim 1. a flow rate measurement unit for measuring the flow rate of the second drainage;
a mixing ratio calculator that calculates the mixing ratio of the first and second waste liquids;
further comprising
The mixing ratio calculation unit calculates the flow rate of the second waste liquid, the water quality of the first waste liquid and the water quality of the second waste liquid measured by the water quality measurement unit, and the water quality of the first waste liquid. calculating the mixing ratio based on a predetermined regulation value of the mixed waste liquid in which the liquid and the second waste liquid are mixed at the mixing ratio;
The exhaust gas treatment device according to claim 1 or 2. The mixing control unit controls the mixing ratio based on the minimum value of the water quality of the first waste liquid stored in the storage unit and the second water quality of the waste liquid measured by the water quality measuring unit. The exhaust gas treatment device according to claim 3, which controls the The water quality measurement unit measures the water quality of the mixed waste liquid,
The mixing control unit further controls the mixing ratio based on the water quality of the mixed waste liquid.
The exhaust gas treatment apparatus according to claim 4. an output measuring unit that measures the output of the power plant that discharges the exhaust gas;
a time acquisition unit that acquires the time since the switching control unit controlled the waste liquid to be supplied to the reaction tower;
Water quality calculation for calculating water quality of the first waste liquid based on the output of the power plant measured by the output measuring section and the flow rate of the first waste liquid measured by the flow rate measuring section. Department and
further comprising
The flow rate measurement unit further measures the flow rate of the first drainage liquid,
The water quality calculation unit calculates a minimum value of the water quality of the first waste liquid based on the output of the power plant, the flow rate of the first waste liquid, and the time.
The exhaust gas treatment device according to claim 4 or 5. 7. The water quality calculation unit calculates a minimum water quality value of the first waste liquid further based on at least one of carbon concentration, ash concentration and sulfur concentration of the fuel consumed by the power plant. The exhaust gas treatment device according to . further comprising a flow rate control unit that controls the flow rate of the liquid based on the output of the power plant that discharges the exhaust gas;
The flow control unit controls the flow rate of the liquid to a flow rate exceeding the flow rate corresponding to the output of the power unit when the waste liquid is not supplied to the reaction tower.
The exhaust gas treatment apparatus according to any one of claims 1 to 7. 9. The exhaust gas treatment apparatus according to claim 8, wherein said flow rate control unit controls the flow rate of said liquid to a flow rate corresponding to the output of said power unit when said waste liquid is supplied to said reaction tower. The water quality measurement unit further measures the water quality of the liquid,
The mixing control unit controls the mixing ratio based on the water quality of the liquid measured by the water quality measuring unit and the water quality of the second waste liquid.
The exhaust gas treatment apparatus according to any one of claims 1 to 9. The reaction tower is mounted on a ship,
The mixing control unit controls the mixing ratio further based on the sailing schedule of the ship.
The exhaust gas treatment apparatus according to any one of claims 1 to 10. The ship is provided in a first sea area where the water quality regulation value of the waste liquid discharged from the reaction tower is a first regulation value, and a second sea area where the water quality regulation value of the waste liquid is looser than the first regulation value. Navigating the second sea area, which is the regulation value,
The mixing control unit, while the ship is navigating the second sea area, further controls the mixing ratio based on the time until the ship navigates the first sea area.
The exhaust gas treatment apparatus according to claim 11. Further comprising a flow control unit for controlling the flow rate of the liquid,
The flow control unit, while the ship is navigating the second sea area, controls the flow rate of the liquid based on the time until the ship navigates the first sea area.
The exhaust gas treatment device according to claim 12. When the ship is navigating the second sea area and the mixture control unit mixes a predetermined minimum amount of the first waste liquid and the second waste liquid, The water quality of the first mixed wastewater measured by the water quality measuring unit, wherein the water quality of the first mixed wastewater obtained by mixing the minimum amount of the first wastewater and the second wastewater is 14. The exhaust gas treatment apparatus according to claim 13, wherein said flow rate control unit increases the flow rate of said liquid when said second regulation value is not satisfied. The water quality measurement unit includes a turbidity measurement unit that measures the turbidity of the effluent, and a hydrocarbon concentration measurement unit that measures the polycyclic aromatic hydrocarbon concentration of the effluent,
The mixing control unit controls the mixing ratio based on at least one of the turbidity of the waste liquid and the polycyclic aromatic hydrocarbon concentration of the waste liquid.
The exhaust gas treatment device according to any one of claims 12 to 14. When the ship is navigating the second sea area, and the water quality of the second mixed effluent obtained by mixing the first effluent and the second effluent satisfies the second regulation value. ,
The water quality of the second mixed waste liquid when the mixing ratio is controlled based on one of the turbidity of the waste liquid and the polycyclic aromatic hydrocarbon concentration of the waste liquid, and the second regulation value 1 difference is the water quality of the second mixed waste liquid when the mixing ratio is controlled based on the other of the turbidity of the waste liquid and the polycyclic aromatic hydrocarbon concentration of the waste liquid, and the second regulation If it is smaller than the second difference from the value, the mixing control unit controls the mixing ratio based on one of the turbidity of the waste liquid and the polycyclic aromatic hydrocarbon concentration of the waste liquid.
The exhaust gas treatment apparatus according to claim 15.

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