WO2022137770A1

WO2022137770A1 - Exhaust gas treatment device

Info

Publication number: WO2022137770A1
Application number: PCT/JP2021/039117
Authority: WO
Inventors: 和芳糸川
Original assignee: 富士電機株式会社
Priority date: 2020-12-23
Filing date: 2021-10-22
Publication date: 2022-06-30
Also published as: JP2022100133A

Abstract

The present invention provides an exhaust gas treatment device comprising: a reaction tower into which an exhaust gas that is discharged from a motive power device and contains sulfur is introduced, and to which a liquid that treats the exhaust gas is provided; a substance amount calculation unit that calculates a substance amount for bisulfite ions in the waste liquid that has treated the exhaust gas in the reaction tower; and an output control unit that controls the output of the motive power device, wherein the output control unit controls the output of the motive power device on the basis of the substance amount, for the bisulfite ions in the waste liquid, calculated by the substance amount calculation unit.

Description

Exhaust gas treatment equipment

The present invention relates to an exhaust gas treatment device.

In Patent Document 1, "a fuzzy arithmetic unit that determines the pH-corrected supply amount demand of an absorbent by using a deviation signal between a measured value of pH and a target value and fuzzy inference based on the rate of change of the deviation signal is installed. "To do" (means for solving the problem).
Patent Document 2 states that "magnesium sulfite and magnesium sulfite produced by desulfurizing exhaust gas are air-oxidized in a liquid reservoir tank to become magnesium sulfate having high solubility, so that the pH value of the circulating absorbent is stable. "(Action).
Patent Document 3 states that "sulfur dioxide in exhaust gas is treated using seawater, and seawater (desulfurized seawater) that has absorbed sulfurous acid gas is adjusted within an appropriate pH range within an optimum decarbonation rate range. After decarbonating and mixing with seawater that has not been subjected to desulfurization (undesulfurized seawater) at an optimum mixing ratio, oxidation and decarbonation treatment are performed "(paragraph 0014).
Patent Document 4 states, "Further improvement of the environmental aspects of the waste treatment procedure, improvement of the efficiency of the waste treatment procedure, minimizing the amount of waste that needs to be handled and disposed of, and the need for inspection and repair. To minimize "(paragraph 0009).
Patent Document 5 states, "Since PM is removed from the exhaust gas discharged from the marine diesel engine by an electrostatic precipitator and SOx is removed by a seawater scrubber, PM and SOx can be reliably removed." It is described (paragraph 0041).
Patent Document 6 states that "SO ₂ contained in the exhaust gas (g1) in the scrubber (10) is brought into contact with the washed seawater (a1) to purify the exhaust gas into purified gas (g2) and absorb SO ₂ . The washed seawater that has been cleaned is discharged as drainage (a2). "(Summary).
[Prior Art Document]
[Patent Document]
[Patent Document 1] Japanese Patent Application Laid-Open No. 3-267114 [Patent Document 2] Japanese Patent Application Laid-Open No. 3-275123 [Patent Document 3] Japanese Patent Application Laid-Open No. 2015-142912 [Patent Document 4] Patent No. 5784719 [Patent Document 5] Patent No. 5971355 [Patent Document 6] International Publication No. 2016/0354887

The problem to be solved

In the exhaust gas treatment device, it is preferable that the pH of the wastewater meets the regulation value while downsizing the equipment such as a pump that supplies the liquid for treating the exhaust gas.

General disclosure

In the first aspect of the present invention, an exhaust gas treatment device is provided. The exhaust gas treatment device consists of a reaction tower in which exhaust gas discharged by a power unit and containing sulfur is introduced and a liquid for treating the exhaust gas is supplied, and hydrogen sulfite ion in the waste liquid obtained by treating the exhaust gas in the reaction tower. It includes a substance amount calculation unit that calculates the substance amount and an output control unit that controls the output of the power unit. The output control unit controls the output of the power unit based on the substance amount of hydrogen sulfite ion in the drainage calculated by the substance amount calculation unit.

The exhaust gas treatment device may further include an exhaust gas sulfur concentration measuring unit for measuring the sulfur concentration of the exhaust gas introduced into the reaction tower. The substance amount calculation unit may calculate the substance amount of hydrogen sulfite ion in the effluent based on the sulfur concentration of the exhaust gas.

The exhaust gas treatment device may further include a purification gas sulfur concentration measuring unit that measures the sulfur concentration of the purification gas in which the exhaust gas is treated with a liquid. The substance amount calculation unit may calculate the substance amount of hydrogen sulfite ion in the effluent based on the sulfur concentration of the purifying gas.

The exhaust gas treatment device may further include a fuel consumption measuring unit that measures the fuel consumption for operating the power device. The substance amount calculation unit may calculate the substance amount of hydrogen sulfite ion in the effluent based on the fuel consumption amount.

The exhaust gas treatment device may further include an output measuring unit that measures the output of the power device. The substance amount calculation unit may calculate the substance amount of hydrogen sulfite ion in the effluent based on the output of the power device measured by the output measurement unit.

The exhaust gas treatment device may further include an exhaust gas amount measuring unit that measures the amount of exhaust gas emitted by the power unit. The substance amount calculation unit may calculate the substance amount of hydrogen sulfite ion in the effluent based on the amount of exhaust gas measured by the exhaust gas amount measuring unit.

The exhaust gas treatment device may further include a hydrogen sulfite ion concentration measuring unit for measuring the hydrogen sulfite ion concentration of the effluent. The substance amount calculation unit may calculate the substance amount of hydrogen sulfite ion in the drainage based on the hydrogen sulfite ion concentration in the drainage.

The substance amount calculation unit may further calculate the substance amount of the liquid alkaline ion. The output control unit may control the output of the power device based on the substance amount of the liquid alkali ion and the substance amount of the hydrogen sulfite ion of the drainage, which are calculated by the substance amount calculation unit.

The exhaust gas treatment device may further include a flow rate control unit that controls the flow rate of the liquid. The substance amount calculation unit may calculate the substance amount of the alkaline ion of the liquid based on the flow rate of the liquid controlled by the flow rate control unit.

The exhaust gas treatment device may further include an alkali ion concentration measuring unit for measuring the alkali ion concentration of the liquid. The substance amount calculation unit may calculate the substance amount of the alkaline ion of the liquid based on the alkali ion concentration of the liquid.

The exhaust gas treatment device may further include a storage unit that stores at least a part of the waste liquid and a storage amount control unit that controls the amount of the waste liquid stored in the storage unit. The substance amount calculation unit may calculate the substance amount of the alkaline ion of the liquid based on the amount of drainage controlled by the storage amount control unit.

The exhaust gas treatment device may further include a mixing ratio control unit that controls the mixing ratio of a part of the liquid and at least a part of the drainage. The substance amount calculation unit may calculate the substance amount of the liquid alkali ion based on the mixing ratio controlled by the mixing ratio control unit.

The exhaust gas treatment device may further include a purifying agent supply amount control unit that is supplied to at least one of the liquid and the effluent and controls the supply amount of the purifying agent that removes at least a part of hydrogen sulfite ions in the effluent. The substance amount calculation unit may calculate the substance amount of the liquid alkali ion based on the supply amount of the purifying agent controlled by the purifying agent supply amount control unit.

The substance amount calculation unit may calculate the pH coefficient of the liquid based on the hydrogen ion concentration of the liquid. The output control unit controls the output of the power unit based on the pH coefficient of the liquid calculated by the substance amount calculation unit, the substance amount of the alkaline ion of the liquid, and the substance amount of hydrogen sulfite ion of the drainage liquid. You can do it.

The output control unit may control the output of the power unit so that the substance amount of the alkaline ion of the liquid becomes larger than the product of the pH coefficient of the liquid and the substance amount of the hydrogen sulfite ion of the drainage liquid.

The exhaust gas treatment device includes a flow rate control unit that controls the flow rate of the liquid, a storage amount control unit that controls the amount of the waste liquid stored in the storage unit that stores a part of the waste liquid, and at least a part of the liquid and discharge. It controls the supply amount of the mixing ratio control unit that controls the mixing ratio with at least a part of the liquid and the purifying agent that is supplied to at least one of the liquid and the drainage and removes at least a part of the hydrogen sulfite ion of the drainage. A purifying agent supply amount control unit may be further provided. The substance amount calculation unit has a liquid flow rate controlled by the flow rate control unit, a drainage amount controlled by the storage amount control unit, a mixing ratio controlled by the mixing ratio control unit, and a purifying agent supply amount control unit. The amount of liquid alkali ion material may be calculated based on at least one of the controlled purifier supplies. The flow control unit controls the flow rate of the liquid or the storage amount control unit controls the flow rate of the liquid so that the substance amount of the alkaline ion of the liquid calculated by the substance amount calculation unit is less than the predetermined set value. The amount may be controlled, the mixing ratio control unit may control the mixing ratio, or the purifying agent supply amount control unit may control the supply amount of the purifying agent.

The substance amount calculation unit may calculate the pH coefficient of the liquid based on the hydrogen ion concentration of the liquid. In the output control unit, the substance amount of the alkaline ion of the liquid calculated by the substance amount calculation unit is larger than the product of the pH coefficient of the liquid and the substance amount of hydrogen sulfite ion of the waste liquid calculated by the substance amount calculation unit. If it is small, the output of the power unit may be reduced.

The reaction tower may be mounted on a ship. The output control unit may control the output of the power unit based on the navigation schedule of the ship and the substance amount of hydrogen sulfite ion in the effluent calculated by the substance amount calculation unit.

The exhaust gas treatment device may further include a position information acquisition unit that acquires the current position of the ship. The output control unit may control the output of the power unit based on the current position of the ship acquired by the position information acquisition unit.

The ship may navigate the first sea area where the regulated value of the pH of the effluent is the first pH and the second sea area where the regulated value of the pH of the effluent is the second pH larger than the first pH. While the ship is navigating in the first sea area, the output control unit may reduce the output of the power unit before the ship is navigating in the second sea area.

The ship may navigate the first sea area where the regulated value of the pH of the effluent is the first pH and the second sea area where the regulated value of the pH of the effluent is the second pH larger than the first pH. While the ship is navigating in the second sea area, the output control unit may increase the output of the power unit before the ship is navigating in the first sea area.

The output control unit may control the output of the power unit based on the distance between the current position of the ship and the second sea area while the ship is navigating in the first sea area, and the output control unit may control the output of the power unit while the ship is navigating in the second sea area. The output of the power unit may be controlled based on the distance between the current position of the sea and the first sea area.

In the second aspect of the present invention, an exhaust gas treatment device is provided. The exhaust gas treatment device consists of a reaction tower in which exhaust gas discharged by a power unit and containing sulfur is introduced and a liquid for treating the exhaust gas is supplied, and hydrogen sulfite ion in the waste liquid obtained by treating the exhaust gas in the reaction tower. It includes a substance amount calculation unit that calculates the substance amount and an output control unit that controls the output of the power unit. The output control unit controls the output of the power device based on the amount of substance of the liquid alkaline ion calculated by the substance amount calculation unit.

When the substance amount of hydrogen sulfite ion in the drainage calculated by the substance amount calculation unit is larger than the substance amount of the alkaline ion in the liquid, the output control unit may reduce the output of the power unit.

When the substance amount of hydrogen sulfite ion in the drainage calculated by the substance amount calculation unit is smaller than the substance amount of the liquid alkali ion, the output control unit may increase the output of the power unit.

The output control unit may increase the output of the power unit as long as the amount of substance of hydrogen sulfite ion in the drainage is equal to or less than the amount of substance of alkaline ion in the liquid.

The exhaust gas treatment device may further include a flow rate control unit. When the substance amount of hydrogen sulfite ion in the drainage calculated by the substance amount calculation unit is larger than the substance amount of the liquid alkali ion calculated by the substance amount calculation unit, the flow control unit determines the flow rate of the liquid. May be increased.

The exhaust gas treatment device may further include a first pH meter that measures the pH of the effluent. The substance amount calculation unit may calculate the substance amount of hydrogen sulfite ion in the drainage solution based on the pH of the drainage solution measured by the first pH meter.

The output control unit may increase the output of the power unit when the pH of the drainage measured by the first pH meter is higher than the predetermined pH.

The output control unit may reduce the output of the power unit when the pH of the drainage measured by the first pH meter is less than a predetermined pH.

The exhaust gas treatment device may further include a second pH meter that measures the pH of the liquid. The substance amount calculation unit may calculate the substance amount of hydrogen sulfite ion in the drainage liquid based on the pH of the liquid measured by the second pH meter.

The amount of substance calculation unit determines the amount of substance of carbonic acid (H2 CO ₃ ), the amount of substance of hydrogen carbonate ion ( ^HCO _3- ⁾ _, and the amount of substance of carbonic acid ion (CO _3-2- ) based on the pH of the liquid. You may calculate. The amount of substance calculation unit may calculate the amount of substance of hydrogen sulfite ion in the effluent based on at least one of the amount of substance of hydrogen carbonate ion ( ^HCO _3- ⁾ and the amount of substance of carbonate ion (CO _3-2- ). ..

While the ship is navigating in the first sea area, before the ship is navigating in the second sea area, at least one of the flow rate control unit, the storage amount control unit, the mixing ratio control unit and the purifying agent supply amount control unit is set to the pH of the effluent. May be controlled.

While the ship is navigating in the second sea area, before the ship is navigating in the first sea area, at least one of the flow rate control unit, the storage amount control unit, the mixing ratio control unit and the purifying agent supply amount control unit is set to the pH of the drainage liquid. May be controlled.

The outline of the above invention does not list all the necessary features of the present invention. A subcombination of these feature groups can also be an invention.

It is a figure which shows an example of the exhaust gas treatment apparatus 100 which concerns on one Embodiment of this invention. The figure which shows an example of the relationship between the pH of liquid 40 and the substance amount ratio of carbonic acid (H ₂ CO ₃ ), hydrogen carbonate ion ( ^HCO ₃ ^－ ) and carbonate ion (CO _3-2- ) contained in liquid 40, respectively. Is. It is a figure which shows an 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. 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 flowchart which shows an example of the control method of the pH of a drainage 46, and the control method of the output Ps of a power apparatus 50, which concerns on one Embodiment of this invention. It is a figure which shows an example of the route of a ship 200. 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 route of a ship 200. It is a figure which shows another example of the route of a ship 200. It is a figure which shows another example of the route of a 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 to the means of solving the invention.

FIG. 1 is a diagram showing an example of an exhaust gas treatment device 100 according to an embodiment of the present invention. The exhaust gas treatment device 100 includes a reaction tower 10, a substance amount calculation unit 74, and an output control unit 73. The exhaust gas treatment device 100 may include a power device 50 and an exhaust gas introduction pipe 32. The substance quantity calculation unit 74 may be a CPU of a computer.

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

The exhaust gas 30 contains sulfur (S). The exhaust gas 30 may contain sulfur oxides (SO _x ). The exhaust gas 30 may further contain nitrogen oxides (NO _x ).

The reaction tower 10 may have an exhaust gas introduction port 11 into which the exhaust gas 30 is introduced and an exhaust gas discharge port 17 into which the exhaust gas 30 is discharged. The liquid 40 for treating the exhaust gas 30 is supplied to the reaction column 10. The liquid 40 supplied to the reaction tower 10 treats the exhaust gas 30 inside the reaction tower 10. The liquid 40 may be seawater or an alkaline liquid other than seawater. Treating the exhaust gas 30 means removing harmful substances contained in the exhaust gas 30.

The liquid 40 becomes a drainage 46 after treating the exhaust gas 30. As described above, the exhaust gas 30 contains sulfur (S). Therefore, the exhaust liquid 46 treated with the exhaust gas 30 contains sulfur (S). The reaction column 10 discharges the waste liquid 46 containing sulfur (S).

The exhaust gas 30 becomes a purifying gas 34 after being treated with the liquid 40. The purification gas 34 is generated inside the reaction tower 10. The purified gas 34 is a gas from which harmful substances such as sulfur oxides (SO _x ) have been removed from the exhaust gas 30 in the gas treatment unit 18. The purified gas 34 is discharged from the exhaust gas discharge port 17.

The reaction tower 10 of this example has a side wall 15, a bottom surface 16, a gas treatment unit 18, and a liquid discharge port 19. The reaction column 10 of this example is columnar. In this example, the exhaust gas discharge port 17 is arranged at a position facing the bottom surface 16 in a direction parallel to the central axis of the columnar reaction tower 10. In this example, the side wall 15 and the bottom surface 16 are the inner side surface and the bottom surface of the columnar reaction tower 10, respectively. The exhaust gas introduction port 11 may be provided on the side wall 15. In this example, the exhaust gas 30 is introduced into the gas treatment unit 18 after passing through the exhaust gas introduction port 11 from the exhaust gas introduction pipe 32.

The side wall 15 and the bottom surface 16 are formed of a material having durability against the exhaust gas 30, the liquid 40 and the drainage 46. The material is a combination of an iron material such as SS400 and S-TEN (registered trademark) and at least one of a coating agent and a coating agent, a copper alloy such as never brass, an aluminum alloy such as aluminum brass, and a nickel alloy such as cupronickel. , Hastelloy®, SUS316L, SUS329J4L or SUS312 and the like.

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

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

The Z-axis direction may be parallel to the gravity direction. If the Z-axis direction is parallel to the gravitational direction, the XY plane may be a horizontal plane. The Z-axis direction may be parallel to the horizontal direction. If the Z-axis direction is parallel to the horizontal direction, the XY plane may be parallel to the direction of gravity.

The exhaust gas treatment device 100 is, for example, a cyclone type scrubber for ships. In the cyclone type scrubber, the exhaust gas 30 introduced into the reaction tower 10 advances in the direction from the exhaust gas introduction port 11 to the exhaust gas discharge port 17 (in this example, the Z-axis direction) while swirling inside the reaction tower 10. .. In this example, the exhaust gas 30 swirls in the XY plane when viewed from the exhaust gas discharge port 17 toward the bottom surface 16.

The reaction tower 10 may have one or more trunk tubes 12 to which the liquid 40 is supplied, and one or more branch tubes 13. The reaction column 10 may have one or more ejection portions 14 that eject the liquid 40. In this example, the ejection portion 14 is connected to the branch pipe 13, and the branch pipe 13 is connected to the trunk pipe 12.

The reaction tower 10 of this example has three trunk tubes 12 (trunk tube 12-1, trunk tube 12-2, and trunk tube 12-3). In this example, the trunk pipes 12-1 and the trunk pipes 12-3 are the trunk pipes 12 provided on the most exhaust gas introduction port 11 side and the most exhaust gas discharge port 17 side, respectively, in the direction parallel to the Z axis. In this example, the trunk pipe 12-2 is a trunk pipe 12 provided between the trunk pipe 12-1 and the trunk pipe 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 on the most exhaust gas introduction port 11 side and the most 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, and the branch pipe 13 -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 pipe 13-1 to the branch pipe 13-4 are connected to the trunk pipe 12-1, the branch pipe 13-5 to the branch pipe 13-8 are connected to the trunk pipe 12-2, and the branch pipe 13- 9 to branch pipe 13-12 are connected to trunk pipe 12-3. Branch pipes 13-1, branch pipes 13-3, branch pipes 13-5, branch pipes 13-7, branch pipes 13-9 and branch pipes 13-11 are located on both sides of the trunk pipe 12 in a direction parallel to the Y axis. May be placed in. Branch pipes 13-2, branch pipes 13-4, branch pipes 13-6, branch pipes 13-8, branch pipes 13-10 and branch pipes 13-12 are located on both sides of the trunk pipe 12 in a direction parallel to the X-axis. May be placed in.

Taking the branch pipe 13-1 as an example, the branch pipe 13-1A and the branch pipe 13-1B are arranged on one side and the other side of the trunk pipe 12-1 in the direction parallel to the Y axis, respectively. 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 positions overlapping with the trunk pipe 12-1.

Taking the branch pipe 13-2 as an example, the branch pipe 13-2A and the branch pipe 13-2B are arranged on one side and the other side of the trunk pipe 12-1 in the direction parallel to the X axis, respectively. 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 ejection portions 14-1 to ejection portions 14-12. In this example, the ejection portion 14-1 and the ejection portion 14-12 are the ejection portions 14 provided on the most exhaust gas introduction port 11 side and the most 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 a direction parallel to the Y-axis, and a plurality of ejection portions 14 may be provided on the other side. May be done. 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 a direction parallel to the X-axis, and a plurality of ejection portions 14 may be provided on the other side. May be done. 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 located at positions overlapping with the trunk pipe 12. Not shown because it is arranged.

The ejection portion 14 has an opening surface for ejecting the liquid 40. In FIG. 1, the opening surface is indicated by an “x” mark. In one branch pipe 13, the opening surfaces of the ejection portions 14 arranged on one side and the other side of the trunk pipe 12 have one direction and the other direction forming a predetermined angle with the extension direction of the branch pipe 13. You may point. Taking the ejection portion 14-2 as an example, in this example, the opening surface of the ejection portion 14-2A arranged on one side of the trunk pipe 12-1 forms a predetermined angle with the branch pipe 13-2A. The opening surface of the ejection portion 14-2B arranged on the other side of the trunk pipe 12-1 points in one direction at a predetermined angle with the branch pipe 13-2B.

The exhaust gas treatment device 100 may include a first pump 60, an introduction pipe 22, and a flow rate control unit 70. The first pump 60 may be provided in the introduction pipe 22. The first pump 60 of this example supplies the liquid 40 to the reaction column 10. The flow rate control unit 70 controls the flow rate of the liquid 40. In this example, the flow rate control unit 70 controls the flow rate of the liquid 40 flowing through the introduction pipe 22. The flow rate control unit 70 may control the flow rate of the liquid 40 supplied to the reaction tower 10. The flow rate of the liquid 40 supplied to the reaction column 10 may refer to the volume of the liquid 40 supplied to the reaction column 10 per unit time, or may refer to the mass.

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

The flow rate control unit 70 may control the flow rate of the liquid 40 supplied to the ejection unit 14. The flow rate 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 12-1 is larger than the flow rate of the liquid 40 supplied to the trunk pipe 12-2. The flow rate 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 larger 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 trunk pipe 12-3, the flow rate of the liquid 40 supplied to the trunk pipe 12-2, and the flow rate of the liquid 40 supplied to the trunk pipe 12-1 is, for example, 1. : 2: 9.

As described above, the exhaust gas 30 contains harmful substances such as sulfur oxides (SO _x ). The sulfur oxide (SO _x ) is, for example, sulfurous acid gas (SO ₂ ). When the liquid 40 is seawater, the liquid 40 contains bicarbonate ion ( ^HCO _3- ⁾ and carbonate ion (CO _3-2- ). In the present specification, the alkaline ion contained in the liquid 40 is referred to as alkaline ion AkI. In this example, the alkaline ion ^AkI is at least one of bicarbonate ion (HCO _3- ⁾ and carbonate ion (CO _3-2- ).

When the liquid 40 is seawater, the reaction between the liquid 40 and the sulfurous acid gas (SO ₂ ) is represented by the following [Chemical Formula 1] to [Chemical Formula 3].
[Chemical formula 1]
SO ₂ + H ₂ O → ^HSO _3- + H ⁺
[Chemical formula 2]
HSO _3- + H ⁺ + ^2HCO _3- + H ₂ O → SO ₃ ^2- + 2CO ² _{+ 3H 2} _O
[Chemical formula 3]
HSO _3- + H ⁺ + CO ₃ ^2- → SO ₃ ^2- + CO ² _{+ H 2} _O

As shown in [Chemical Formula 1], sulfurous acid gas (SO ₂ ) becomes hydrogen sulfite ion (HSO _3- ⁾ by a chemical reaction. In [Chemical formula ² ] and [Chemical formula 3], hydrogen sulfite ions (HSO _3- ) generated by the chemical reaction of [Chemical formula 1] are hydrogen carbonate ion (HCO _3- ⁾ and carbonate ion ₍ CO ^3-2- ), respectively. When it reacts with. Hydrogen sulfite ion (HSO _3- ⁾ becomes sulfite ion (SO _3-2- ) by the chemical reaction shown in [Chemical formula ² ] and [Chemical formula 3].

The amount of substance of hydrogen sulfite ion (HSO _3- ⁾ generated by [Chemical formula 1] is based on the amount of substance of hydrogen carbonate ion ( ^HCO _3- ⁾ and the amount of substance of carbonate ion (CO _3-2- ) contained in the liquid 40. If it is too large, hydrogen sulfite ion (HSO _3- ⁾ remains in the drainage 46. The amount of hydrogen ion (H ⁺ ) produced by [Chemical Formula 1] is larger than the amount of hydrogen carbonate ion ( ^HCO _3- ) and the amount of carbonate ion ₍ CO ^3-2- ) contained in the liquid 40. In this case, hydrogen ions (H ⁺ ) remain in the drainage 46.

In the present specification, hydrogen sulfite ion (HSO _3- ⁾ and hydrogen ion (H ⁺ ) generated by [Chemical Formula 1] are referred to as hydrogen sulfite ion ShI and hydrogen ion HI, respectively. The substance amount calculation unit 74 calculates the substance amount of the hydrogen sulfite ion ShI of the drainage 46. Amount of substance refers to the number of elemental particles that make up a substance. Element particles refer to the atoms or molecules that make up a substance. The amount of substance is, for example, the number of moles. The number of moles is a number in which a set of Avogadro constant (6.02 × 10 ²³ ) element particles is used as a unit. The substance amount calculation unit 74 may calculate the substance amount of the hydrogen ion HI of the drainage 46.

The output control unit 73 controls the output of the power unit 50. The output control unit 73 controls the output of the power device 50 based on the substance amount of the hydrogen sulfite ion ShI of the drainage 46 calculated by the substance amount calculation unit 74. By controlling the output of the power device 50 based on the amount of substance of the hydrogen sulfite ion ShI, the output control unit 73 can control the amount of the exhaust gas 30 discharged from the power device 50.

The substance amount calculation unit 74 may calculate the substance amount of the alkaline ion AkI of the liquid 40. The output control unit 73 may control the output of the power device 50 based on the substance amount of the alkaline ion AkI of the liquid 40 calculated by the substance amount calculation unit 74. By controlling the output of the power device 50 based on the amount of substance of the alkaline ion AkI, the output control unit 73 can control the amount of the exhaust gas 30 discharged from the power device 50.

The pH regulation value for scrubber wastewater discharged from ships to the ocean is set by the International Maritime Organization (IMO). The regulation value varies depending on the sea area, but in the strictest sea area, the regulation value of pH is 6.0 or more at the time of outboard discharge (as of 2020).

In the exhaust gas treatment device 100 of this example, the output control unit 73 controls the output of the power device 50 based on the amount of substance of the hydrogen sulfite ion ShI of the effluent 46. Therefore, in the exhaust gas treatment device 100 of this example, the output control unit 73 can control the output of the power device 50 so that the pH of the drainage 46 satisfies the regulated value. In the exhaust gas treatment device 100 of this example, the output control unit 73 controls the output of the power device 50 based on the amount of substance of the alkaline ion AkI of the liquid 40. Therefore, in the exhaust gas treatment device 100 of this example, the output control unit 73 can control the output of the power device 50 so that the pH of the drainage 46 satisfies the regulated value.

The output control unit 73 controls the output of the power device 50 based on the substance amount of hydrogen sulfite ion ShI of the drainage 46 and the substance amount of the alkali ion AkI of the liquid 40 calculated by the substance amount calculation unit 74. good. When the substance amount of the hydrogen sulfite ion ShI calculated by the substance amount calculation unit 74 is larger than the substance amount of the alkaline ion AkI, the output control unit 73 may reduce the output of the power unit 50. By reducing the output of the power device 50 by the output control unit 73, the amount of the exhaust gas 30 discharged from the power device 50 can be easily reduced. Therefore, the amount of sulfur oxides (SO _x ) contained in the exhaust gas 30 and introduced into the reaction tower 10 can be easily reduced. Therefore, the amount of hydrogen sulfite ion ShI and the amount of hydrogen ion HI that do not chemically react with the alkaline ion AkI are more likely to be reduced than before the output of the power unit 50 was reduced. Therefore, the pH of the drainage 46 easily satisfies the regulation value.

When the substance amount of the hydrogen sulfite ion ShI calculated by the substance amount calculation unit 74 is smaller than the substance amount of the alkaline ion AkI, the output control unit 73 may increase the output of the power unit 50. By increasing the output of the power device 50 by the output control unit 73, the amount of the exhaust gas 30 discharged from the power device 50 tends to increase. Therefore, the amount of sulfur oxides (SO _x ) contained in the exhaust gas 30 and introduced into the reaction tower 10 tends to increase. Therefore, the amount of the hydrogen sulfite ion ShI and the alkaline ion AkI that does not chemically react with the hydrogen ion HI is more likely to be reduced than before the output of the power unit 50 is reduced.

The output control unit 73 may increase the output of the power device 50 as long as the amount of substance of hydrogen sulfite ion ShI is equal to or less than the amount of substance of alkaline ion AkI. The output control unit 73 may increase the output of the power unit 50 within a range in which the pH of the drainage 46 satisfies the regulated value.

Heavy oil C may be used as the fuel for operating the marine scrubber. The concentration of sulfur (S) in the C heavy oil is specified to be 3.5% by weight or less. Therefore, in the marine scrubber, even when the concentration of sulfur (S) in the heavy oil C is 3.5% by weight, which is the upper limit of the concentration, the pH of the scrubber wastewater satisfies the regulation value and The scrubber is designed so that the concentration of sulfur dioxide (SO ₂ ), etc. in the exhaust gas emitted from the scrubber meets the regulation value.

The concentration of sulfur (S) in heavy fuel oil C, which is usually used for marine scrubbers, is 2.0 to 2.5% by weight. Therefore, when the marine scrubber is operated with C heavy oil having a sulfur (S) concentration of 2.0 to 2.5% by weight, the reaction tower, seawater pump, etc. provided in the marine scrubber may be excessively large. be. However, if the reaction tower, seawater pump, etc. are designed on the assumption that the marine scrubber will be operated with C heavy oil having a sulfur (S) concentration of 2.0 to 2.5% by weight, the marine scrubber will be used. When operated with C heavy oil having a sulfur (S) concentration of 3.5% by weight, the pH of the scrubber wastewater tends not to meet the regulation value, and sulfur dioxide (SO ₂ ), etc., of the exhaust gas discharged from the scrubber, etc. Concentration tends not to meet the regulation value.

In the exhaust gas treatment device 100 of this example, the output control unit 73 controls the output of the power device 50 based on the amount of substance of hydrogen sulfite ion ShI of the drainage 46 and the amount of substance of alkali ion AkI of the liquid 40. Therefore, assuming that the exhaust gas treatment device 100 is operated with C heavy oil having a sulfur (S) concentration of, for example, 2.0 to 2.5% by weight, the power device 50, the first pump 60, and the second pump Even when 62 (described later) and the purifying agent storage unit 75 (described later) are designed, the output control unit 73 controls the output of the power unit 50, so that the pH of the drainage 46 satisfies the regulation value. In addition, the concentration of sulfur dioxide (SO ₂ ) or the like in the purifying gas 34 is likely to meet the regulation value. Therefore, in the exhaust gas treatment device 100 of this example, the pH of the waste liquid 46 satisfies the regulation value, and the concentration of sulfur dioxide (SO ₂ ) or the like of the purification gas 34 satisfies the regulation value, while the power device 50, It is possible to suppress the increase in size of the reaction tower 10, the first pump 60, the second pump 62 (described later), the purifying agent storage unit 75 (described later), and the like.

The exhaust gas treatment device 100 may include an output measuring unit 95. The output measuring unit 95 measures the output of the power unit 50. The concentration of sulfur (S) in the exhaust gas 30 tends to increase as the output of the power unit 50 increases. The substance amount calculation unit 74 may calculate the substance amount of the hydrogen sulfite ion ShI of the drainage 46 based on the output of the power device 50 measured by the output measurement unit 95.

The exhaust gas treatment device 100 may include an exhaust gas sulfur concentration measuring unit 91. The exhaust gas sulfur concentration measuring unit 91 measures the sulfur (S) concentration of the exhaust gas 30 introduced into the reaction tower 10. The concentration of sulfur (S) in the exhaust gas 30 tends to increase as the output of the power unit 50 increases. The substance amount calculation unit 74 may calculate the substance amount of the hydrogen sulfite ion ShI of the waste liquid 46 based on the sulfur (S) concentration of the exhaust gas 30 measured by the exhaust gas sulfur concentration measuring unit 91.

In this example, the exhaust gas sulfur concentration measuring unit 91 is provided in the exhaust gas introduction pipe 32. The exhaust gas sulfur concentration measuring unit 91 may measure the concentration of sulfur (S) in the exhaust gas 30 passing through the exhaust gas introduction pipe 32.

The exhaust gas treatment device 100 may include an exhaust gas amount measuring unit 92. The exhaust gas amount measuring unit 92 measures the amount of the exhaust gas 30 discharged by the power unit 50. The amount of the exhaust gas 30 may refer to the volume of the exhaust gas 30 discharged by the power unit 50 per unit time, or may refer to the mass. The amount of the exhaust gas 30 tends to increase as the load on the power unit 50 increases. The substance amount calculation unit 74 may calculate the substance amount of the hydrogen sulfite ion ShI of the effluent 46 based on the amount of the exhaust gas 30 measured by the exhaust gas amount measurement unit 92.

In this example, the exhaust gas amount measuring unit 92 is provided in the exhaust gas introduction pipe 32. The exhaust gas amount measuring unit 92 may measure the flow rate of the exhaust gas 30 passing through the cross section of the exhaust gas introduction pipe 32 intersecting the traveling direction of the exhaust gas 30 in the exhaust gas introduction pipe 32 per unit time.

The exhaust gas treatment device 100 may include a hydrogen sulfite ion concentration measuring unit 93. The hydrogen sulfite ion concentration measuring unit 93 measures the concentration of hydrogen sulfite ion ShI in the drainage 46. As described above, the exhaust gas 30 becomes a drainage 46 after being treated with the liquid 40. Therefore, the concentration of hydrogen sulfite ion ShI in the drainage 46 reflects the desulfurization rate of the exhaust gas 30 by the liquid 40. The substance amount calculation unit 74 may calculate the substance amount of the hydrogen sulfite ion ShI of the drainage 46 based on the concentration of the hydrogen sulfite ion ShI of the drainage 46.

In this example, the hydrogen sulfite ion concentration measuring unit 93 is provided in the drain pipe 20. The hydrogen sulfite ion concentration measuring unit 93 may measure the concentration of hydrogen sulfite ion ShI in the drainage 46 passing through the drain pipe 20.

As described above, the flow rate control unit 70 controls the flow rate of the liquid 40. The substance amount calculation unit 74 may calculate the substance amount of the alkali ion AkI of the liquid 40 based on the flow rate of the liquid 40 controlled by the flow rate control unit 70. When the substance amount of hydrogen sulfite ion ShI calculated by the substance amount calculation unit 74 is larger than the substance amount of the alkali ion AkI, the flow rate control unit 70 may increase the flow rate of the liquid 40. By increasing the flow rate of the liquid 40 by the flow rate control unit 70, the amount of alkaline ion AkI contained in the liquid 40 and supplied to the reaction tower 10 tends to increase. Therefore, the pH of the drainage 46 easily satisfies the regulation value.

The exhaust gas treatment device 100 may include a second pump 62, an introduction pipe 24, a purifying agent storage unit 75, and a purifying agent supply amount control unit 77. The introduction pipe 24 connects the purifying agent storage portion 75 and the drain pipe 20. The purifying agent 78 is stored in the purifying agent storage unit 75.

The purifying agent 78 removes at least a part of the hydrogen sulfite ion ShI of the drainage 46. The purifying agent 78 may be supplied to at least one of the liquid 40 and the drain 46. In this example, the purifying agent 78 is supplied to the drainage 46.

The purifying agent supply amount control unit 77 controls the supply amount of the purifying agent 78. In this example, the purifying agent supply amount control unit 77 controls the flow rate of the purifying agent 78 flowing through the introduction pipe 24. The second pump 62 may be provided in the introduction pipe 24. The second pump 62 of this example supplies the purifying agent 78 to the drain pipe 20. When the purifying agent 78 is supplied to the liquid 40, the purifying agent 78 may be supplied to the introduction pipe 22.

The purifying agent supply amount control unit 77 may have a valve 76. In this example, the purifying agent supply amount control unit 77 controls the supply amount of the purifying agent 78 by the valve 76. The purifying agent supply amount control unit 77 may control the supply amount of the purifying agent 78 supplied to the drain pipe 20. The supply amount of the purifying agent 78 supplied to the drain pipe 20 may refer to the volume of the purifying agent 78 supplied to the drain pipe 20 per unit time, or may refer to the mass. In the drain pipe 20, the purifying agent 78 is mixed with the drainage 46.

The purifying agent 78 may be at least one of a magnesium compound, a sodium compound and a calcium compound. The purifying 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 ). May be.

When the purifying agent 78 is sodium hydroxide (NaOH), the reaction between the hydrogen sulfite ion ShI (HSO _3- ⁾ contained in the waste liquid 46 and the purifying agent 78 is represented by the following [Chemical Formula 4].
[Chemical formula 4]
^HSO _3- + H ⁺ + 2 NaOH → Na ₂ SO ₄ + H ₂ O

The hydrogen ion (H ^{+) in [Chemical formula 4] may be the hydrogen ion (H +} ⁾ generated in [Chemical formula 1]. At least a part of hydrogen sulfite ion ShI becomes sodium sulfate (Na ₂ SO ₄ ) and water (H ₂ O) by the chemical reaction shown in [Chemical formula 4]. The aqueous solution of sodium sulfate (Na ₂ ^SO ₄ ) contains sulfate ions (SO _4-2 ).

The substance amount calculation unit 74 may calculate the substance amount of the alkaline ion AkI of the liquid 40 based on the supply amount of the purifying agent 78 controlled by the purifying agent supply amount control unit 77. When the purifying agent 78 is supplied, the purifying agent 78 chemically reacts with the hydrogen sulfite ion ShI as shown in [Chemical formula 4], so that the amount of substance of the hydrogen sulfite ion ShI is the amount of the sulfite when the purifying agent 78 is not supplied. It tends to be smaller than the amount of substance of hydrogen ion ShI. The output control unit 73 may control the output of the power device 50 based on the amount of substance of the hydrogen sulfite ion ShI when the purifying agent 78 is supplied.

The exhaust gas treatment device 100 may include a first pH meter 89. The first pH meter 89 measures the pH of the drainage 46. In this example, the first pH meter 89 is provided in the drain pipe 20. The substance amount calculation unit 74 may calculate the substance amount of the hydrogen sulfite ion ShI of the drainage liquid 46 based on the pH of the drainage liquid 46 measured by the first pH meter 89. In [Chemical Formula 1], the amount of substance of hydrogen sulfite ion ShI and the amount of substance of hydrogen ion HI are equal. Therefore, the substance amount calculation unit 74 can calculate the substance amount of the hydrogen sulfite ion ShI of the drainage 46 based on the pH of the drain 46.

When the purifying agent 78 is supplied to the drainage liquid 46, the first pH meter 89 may measure the pH of the drainage liquid 46 before the purifying agent 78 is supplied. The first pH meter 89 measures the pH of the drainage 46 before the purifying agent 78 is supplied, so that the first pH meter 89 has the liquid 40 and the exhaust gas 30 inside the reaction tower 10 [Chemical formula 1]. It becomes easy to measure the pH of the effluent 46 produced by carrying out the chemical reaction shown in.

The output control unit 73 may increase the output of the power unit 50 when the pH of the drainage 46 measured by the first pH meter 89 is higher than a predetermined pH. The output control unit 73 may reduce the output of the power unit 50 when the pH of the effluent 46 measured by the pH meter is less than a predetermined pH.

The exhaust gas treatment device 100 may include a second pH meter 88. The second pH meter 88 measures the pH of the liquid 40. In this example, the second pH meter 88 is provided in the introduction tube 22. The substance amount calculation unit 74 may calculate the substance amount of the hydrogen sulfite ion ShI of the drainage 46 based on the pH of the liquid 40 measured by the second pH meter 88. In [Chemical Formula 2], the amount of substance of hydrogen sulfite ion ShI is equal to the amount of substance of hydrogen ion HI, and the amount of substance of hydrogen carbonate ion (HCO _3- ⁾ is twice the amount of substance of hydrogen sulfite ion ShI. .. In [Chemical Formula 3], the amount of substance of hydrogen sulfite ion ShI and the amount of substance of hydrogen ion HI are equal, and the amount of substance of hydrogen sulfite ion ^ShI and the amount of substance of carbonate ion (CO _3-2- ) are equal. Therefore, the substance amount calculation unit 74 can calculate the substance amount of the hydrogen sulfite ion ShI of the drainage 46 based on the pH of the liquid 40.

FIG. ² shows an example of the relationship between the pH of the liquid 40 and the substance amount ratios of carbonic acid (H ₂ CO ₃ ), bicarbonate ion (HCO ₃ ⁻ ) and carbonate ion (CO _3-2- ) contained in the liquid 40. , Each is a diagram showing. In FIG. ₂ , the amount of substance of carbonic acid (H ₂ CO ₃ ), hydrogen carbonate ion (HCO ₃ ⁻ ) and carbonate ion (CO _3-2- ) is the substance of carbonic acid (H ² CO ₃ ) when the pH is 3. It is standardized by quantity.

From FIG. ² , the substance amount ratio of carbonic acid (H ₂ CO ₃ ), bicarbonate ion (HCO ₃ ⁻ ) and carbonate ion (CO _3-2- ) depends on the pH of the liquid 40. The amount of substance calculation unit 74 is based on the pH of the liquid 40, the amount of substance of carbonic acid (H ₂ CO ₃ ), the amount of substance of hydrogen carbonate ion ( ^HCO ₃ ⁻ ), and the substance of carbonic acid ion (CO _3-2- ). You may calculate the amount. The substance amount calculation unit 74 determines the hydrogen sulfite ion ^ShI of the effluent 46 based on at least one of the calculated substance amount of hydrogen carbonate ion (HCO ₃ ⁻ ) and the substance amount of carbonate ion (CO _3-2- ). You may calculate the amount of substance.

FIG. 3 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. In FIG. 3, the exhaust gas introduction pipe 32, the introduction pipe 24, the introduction pipe 22, and the drainage pipe 20 in FIG. 1 are shown by thick solid lines. The exhaust gas treatment device 100 of this example is different from the exhaust gas treatment device 100 shown in FIG. 1 in that it further includes a purified gas sulfur concentration measuring unit 94, a fuel supply unit 97, and a fuel consumption amount measuring unit 98.

The fuel supply unit 97 supplies the power unit 50 with the fuel 96 for operating the power unit 50. When the exhaust gas treatment device 100 is a marine scrubber, the fuel 96 is, for example, C heavy oil. The fuel consumption measuring unit 98 measures the consumption of the fuel 96. The consumption amount of the fuel 96 may refer to the volume of the fuel 96 consumed by the power unit 50 per unit time, or may refer to the mass. The consumption of the fuel 96 tends to increase as the output of the power unit 50 increases.

The substance amount calculation unit 74 may calculate the substance amount of the hydrogen sulfite ion ShI of the effluent 46 based on the consumption amount of the fuel 96. When the fuel 96 is heavy fuel oil C, the fuel 96 contains sulfur (S). Therefore, as the fuel 96 is consumed by the power unit 50, the exhaust gas 30 tends to contain sulfur oxides (SO _x ). The sulfur oxide (SO _x ) is, for example, sulfurous acid gas (SO ₂ ). As shown in [Chemical Formula 1], when the liquid 40 treats the exhaust gas 30 containing sulfurous acid gas (SO ₂ ) (see FIG. 1), the waste liquid 46 tends to contain hydrogen sulfite ion ShI.

In this example, the substance amount calculation unit 74 calculates the substance amount of the hydrogen sulfite ion ShI of the effluent 46 based on the consumption amount of the fuel 96 measured by the fuel consumption amount measurement unit 98. In this example, the output control unit 73 controls the output of the power device 50 based on the amount of the substance of the hydrogen sulfite ion ShI. Therefore, in this example, the output control unit 73 can control the output of the power device 50 so that the pH of the drainage 46 satisfies the regulated value.

The purified gas sulfur concentration measuring unit 94 measures the sulfur (S) concentration of the purified gas 34. As described above, the purified gas 34 is a gas in which the exhaust gas 30 is treated with the liquid 40. Sulfur oxides (SO _x ) and the like contained in the exhaust gas 30 and not treated _by the liquid 40 may remain in the purified gas 34. The substance amount calculation unit 74 may calculate the substance amount of the hydrogen sulfite ion ShI of the waste liquid 46 based on the sulfur (S) concentration of the purification gas 34 measured by the purification gas sulfur concentration measurement unit 94.

In this example, the purified gas sulfur concentration measuring unit 94 is provided at the exhaust gas discharge port 17. The purified gas sulfur concentration measuring unit 94 may measure the concentration of sulfur (S) in the purified gas 34 passing through the exhaust gas discharge port 17 from the inside to the outside of the reaction tower 10.

The substance amount calculation unit 74 has the sulfur (S) concentration of the exhaust gas 30 measured by the exhaust gas sulfur concentration measuring unit 91 and the sulfur (S) concentration of the purified gas 34 measured by the purified gas sulfur concentration measuring unit 94. The amount of substance of the hydrogen sulfite ion ShI of the effluent 46 may be calculated based on at least one of the above. The difference between the sulfur (S) concentration of the exhaust gas 30 and the sulfur (S) concentration of the purified gas 34 reflects the desulfurization rate of the exhaust gas 30 by the liquid 40.

The sulfur (S) concentration of the exhaust gas 30 measured by the exhaust gas sulfur concentration measuring unit 91 is defined as the sulfur concentration Ds [%]. The consumption amount of the fuel 96 measured by the fuel consumption amount measuring unit 98 is defined as the consumption amount Cs [g / kWh]. The output of the power unit 50 measured by the output measuring unit 95 is defined as an output Ps [kW]. The concentration of hydrogen sulfite ion ShI in the waste liquid 46 measured by the hydrogen sulfite ion concentration measuring unit 93 is defined as the hydrogen sulfite ion concentration Dsh. The output Ps may be calculated by the exhaust gas amount measuring unit 92 based on the amount of the exhaust gas 30.

The substance amount calculation unit 74 may calculate the substance amount of hydrogen sulfite ion ShI based on the sulfur concentration Ds, the consumption amount Cs, the output Ps, and the hydrogen sulfite ion concentration Dsh. The amount of the substance is the first factor that affects the pH of the effluent 46. The first factor is defined as the first factor S1 [mol / h]. The desulfurization rate of sulfur (S) contained in the exhaust gas 30 is defined as the desulfurization rate De [%]. The first factor S1 is represented by the following equation (1).

The desulfurization rate De may be calculated based on the sulfite ion concentration Dsh. The desulfurization rate De may be calculated based on the concentration of sulfur (S) in the exhaust gas 30 and the concentration of sulfur (S) in the purified gas 34. The output Ps of the power unit 50 may be calculated based on the amount of the exhaust gas 30 measured by the exhaust gas amount measuring unit 92.

The first factor S1 represents the amount of the sulfur (S) contained in the exhaust gas 30 that has become the hydrogen sulfite ion ShI by the chemical reaction of the liquid 40 with the [chemical formula 1]. The output control unit 73 may control the output of the power device 50 based on the first factor S1.

FIG. 4 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to one embodiment of the present invention. The exhaust gas treatment device 100 of this example is different from the exhaust gas treatment device 100 shown in FIG. 3 in that it further includes an alkaline ion concentration measuring unit 82.

The alkaline ion concentration measuring unit 82 measures the concentration of alkaline ion AkI in the liquid 40. As mentioned above, in this example, the alkaline ion ^AkI is at least one of hydrogen carbonate ion (HCO _3- ⁾ and carbonate ion (CO _3-2- ). In this example, the alkaline ion concentration measuring unit 82 is provided in the introduction pipe 22. The alkaline ion concentration measuring unit 82 may measure the concentration of the alkaline ion AkI of the liquid 40 passing through the introduction pipe 22. The substance amount calculation unit 74 may calculate the substance amount of the alkali ion of the liquid 40 based on the concentration of the alkali ion AkI of the liquid 40 measured by the alkali ion concentration measuring unit 82.

The flow rate of the liquid 40 controlled by the flow rate control unit 70 is defined as a flow rate F [l / h]. In this example, the flow rate F is the total flow rate of the liquid 40 passing through the valves 72-1 to 72-3 (see FIG. 1). The concentration of the alkaline ion AkI measured by the alkaline ion concentration measuring unit 82 is defined as the alkaline ion concentration Da [%].

The substance amount calculation unit 74 may calculate the substance amount of the alkali ion AkI based on the flow rate F and the alkali ion concentration Da. The amount of the substance is a second factor that affects the pH of the effluent 46. The second factor is referred to as the second factor S2 [mol / h]. The second factor S2 is represented by the following equation (2).

The flow rate F may be the flow rate of the liquid 40 diluted with water ( _H2O ) containing no alkaline ion AkI. The alkaline ion concentration Da may be the concentration of the alkaline ion AkI of the liquid 40 diluted with water ( _H2O ) containing no alkaline ion AkI.

As described above, hydrogen sulfite ion ShI is produced by the chemical reaction of [Chemical formula 1]. The second factor S2 represents the amount of substance of the alkaline ion AkI capable of undergoing a chemical reaction with the hydrogen sulfite ion ShI at least one of [Chemical formula 2] and [Chemical formula 3]. The output control unit 73 may control the output Ps of the power unit 50 based on the second factor S2.

The output control unit 73 may control the output Ps of the power device 50 based on the first factor S1 and the second factor S2. The output control unit 73 may control the output Ps of the power device 50 so that the second factor S2 is larger than the first factor S1. By controlling the output Ps so that the second factor S2 is larger than the first factor S1, the pH of the drainage 46 is likely to satisfy the regulation value.

FIG. 5 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to one embodiment of the present invention. The exhaust gas treatment device 100 of this example is different from the exhaust gas treatment device 100 shown in FIG. 3 in that it further includes a pipe 25, a storage unit 87, a storage amount control unit 86, and a gas supply unit 85.

The pipe 25 connects the drain pipe 20 and the storage unit 87. In this example, the exhaust gas treatment device 100 includes two pipes 25 (pipe 25-1 and pipe 25-2). The storage amount control unit 86 includes a valve 79. In this example, the storage amount control unit 86 includes two valves 79 (valve 79-1 and valve 79-2). In this example, the valve 79-1 is provided in the pipe 25-1, and the valve 79-2 is provided in the pipe 25-2.

The storage unit 87 stores at least a part of the drainage 46. The storage unit 87 is, for example, a decarbonation tower. At least a part of the drainage 46 flowing through the drainage pipe 20 flows through the pipe 25-1, and then is stored in the storage unit 87. At least a part of the drainage 47 stored in the storage unit 87 flows through the pipe 25-2 and then into the drainage pipe 20.

The storage amount control unit 86 controls the amount of the drainage liquid 46 stored in the storage unit 87. In this example, the storage amount control unit 86 controls the amount of the drainage 46 flowing through the pipe 25-1 by controlling the valve 79-1. In this example, the storage amount control unit 86 controls the amount of the drainage 47 flowing through the pipe 25-2 by controlling the valve 79-2. When the reservoir 87 is a decarboxylation tower, the drainage 47 is a drainage from which at least a part of hydrogen carbonate ion (HCO _3- ⁾ contained in the drainage 46 has been removed.

The amount of the drainage 46 flowing through the pipe 25-1 may refer to the volume of the drainage 46 flowing through the pipe 25-1 per unit time, or may refer to the mass. The amount of the drainage 47 flowing through the pipe 25-2 may refer to the volume of the drainage 47 flowing through the pipe 25-2 per unit time, or may refer to the mass.

The gas supply unit 85 supplies gas to the storage unit 87. The gas may be the atmosphere. In the storage unit 87, carbon dioxide (CO ₂ ) may be generated from the hydrogen carbonate ion (HCO _3- ⁾ contained in the waste liquid 46. The carbon dioxide (CO ₂ ) may be released into the atmosphere by aeration. In this example, the carbon dioxide (CO ₂ ) is aerated by the gas supplied by the gas supply unit 85.

The drainage 47 may be mixed with the drainage 46 in the drainage pipe 20. The drainage 47 mixed with the drainage 46 may be discharged to the outside of the exhaust gas treatment device 100. When the reservoir 87 is a decarboxylation tower, the pH of the drainage 47 tends to be higher than the pH of the drainage 46. Therefore, the pH of the drainage 46 mixed with the drainage 47 tends to be higher than the pH of the drainage 46 not mixed with the drainage 47. Therefore, the pH of the drainage 46 mixed with the drainage 47 easily satisfies the regulation value.

The substance amount calculation unit 74 may calculate the substance amount of the alkali ion AkI of the liquid 40 based on the amount of the drainage 46 controlled by the storage amount control unit 86. The larger the amount of the drainage 46 controlled by the storage amount control unit 86, the higher the pH of the drainage 46 mixed with the drainage 47 in the drainage pipe 20 is likely to be. Therefore, as the amount of the drainage 46 controlled by the storage amount control unit 86 increases, the amount of substance of the alkaline ion AkI in which the second factor S2 becomes larger than that of the first factor S1 tends to be smaller.

FIG. 6 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to one embodiment of the present invention. The exhaust gas treatment device 100 of this example is different from the exhaust gas treatment device 100 shown in FIG. 5 in that it further includes a pipe 23 and a mixing ratio control unit 84.

The pipe 23 connects the introduction pipe 22 and the drain pipe 20. In this example, the mixing ratio control unit 84 includes a valve 83. In this example, the valve 83 is provided on the pipe 23.

A part of the liquid 40 flowing through the introduction pipe 22 flows through the pipe 23. In this example, the mixing ratio control unit 84 controls the flow rate of the liquid 40 flowing through the pipe 23 by controlling the valve 83. The flow rate of the liquid 40 flowing through the tube 23 may refer to the volume of the liquid 40 flowing through the tube 23 per unit time, or may refer to the mass.

The mixing ratio control unit 84 controls the mixing ratio of a part of the liquid 40 and at least a part of the drainage 46. In this example, the mixing ratio control unit 84 controls the mixing ratio of the liquid 40 and the drainage liquid 46 to be mixed in the drainage pipe 20. The substance amount calculation unit 74 may calculate the substance amount of the alkaline ion AkI of the liquid 40 based on the mixing ratio controlled by the mixing ratio control unit 84.

The concentration of hydrogen sulfite ion ShI and the concentration of hydrogen ion HI in the drainage 46 are diluted by mixing with the liquid 40. Therefore, the pH of the drainage 46 mixed with the liquid 40 tends to be higher than the pH of the drainage 46 not mixed with the liquid 40. Therefore, the mixing ratio control unit 84 controls the mixing ratio of a part of the liquid 40 and at least a part of the drainage 46, so that the pH of the drainage 46 mixed with the liquid 40 satisfies the regulation value. It will be easier. The substance amount calculation unit 74 has a mixing ratio of a part of the liquid 40 and at least a part of the drainage 46 controlled by the mixing ratio control unit 84, and the drainage controlled by the storage amount control unit 86. The amount of substance of the alkali ion AkI of the liquid 40 may be calculated based on the amount of 46.

When the liquid 40 is seawater, carbon dioxide (CO ₂ ) in the atmosphere may be dissolved in the liquid 40. The reaction between the liquid 40 and carbon dioxide (CO ₂ ) is represented by the following [Chemical Formula 5].
[Chemical formula 5]
CO ₂ + H ₂ O → H ₂ CO ₃

The carbonic acid (H ₂ CO ₃ ) produced by the chemical reaction of [Chemical formula 5] is ionized in the liquid 40 as shown by the following [Chemical formula 6].
[Chemical formula 6]
H ₂ CO ₃ → H ⁺ + HCO ₃ ^－

A part of the bicarbonate ion ( ^HCO _3- ⁾ shown in [Chemical formula 6] is further ionized into the carbonate ion (CO _3-2- ) as shown in the following [Chemical formula 7].
[Chemical formula 7]
^HCO _3- → H ⁺ + CO ₃ ^2-
The ratio of ionization to bicarbonate ion (CO _3-2- ) among hydrogen carbonate ion ( ^HCO ₃ ⁻ ) depends on the concentration of hydrogen carbonate ion (HCO ₃ ⁻ ) contained in the liquid 40. Due to the hydrogen ions (H ⁺ ) represented by [Chemical Formula 6] and [Chemical Formula 7], the pH of the liquid 40 may be lower than the pH of water ( _H2O ). The hydrogen ion (H ⁺ ) contained in the liquid 40 is referred to as hydrogen ion HI.

The substance amount calculation unit 74 may calculate the pH coefficient of the liquid 40 based on the concentration of the hydrogen ion HI of the liquid 40. The substance amount calculation unit 74 may calculate the pH coefficient of the liquid 40 based on the pH of the liquid 40 measured by the second pH meter 88. The pH coefficient of the liquid 40 is a predetermined coefficient with respect to the first factor S1 that affects the amount of substance of the hydrogen sulfite ion ShI of the drainage 46. The pH coefficient is referred to as pH coefficient A.

The substance amount calculation unit 74 may calculate the substance amount of the hydrogen carbonate ion (HCO _3- ⁾ of the liquid 40 based on the pH of the liquid 40 measured by the second pH meter 88. The substance amount calculation unit 74 may calculate the substance amount of the hydrogen sulfite ion ShI of the drainage liquid 46 based on the pH of the drainage liquid 46 measured by the first pH meter 89. The substance amount calculation unit 74 is based on the substance amount of the hydrogen carbonate ion (HCO _3- ⁾ of the calculated liquid 40 and the substance amount of the hydrogen sulfite ion ShI of the calculated drainage 46, and is based on the substance amount of the liquid 40. The pH coefficient A may be calculated.

The substance amount calculation unit 74 may calculate the concentration of bicarbonate ion (HCO _3- ⁾ of the liquid 40 based on the pH of the liquid 40 measured by the second pH meter 88. The substance amount calculation unit 74 may calculate the concentration of hydrogen sulfite ion ShI in the drainage 46 based on the pH of the drainage 46 measured by the first pH meter 89. The substance amount calculation unit 74 determines the pH coefficient of the liquid 40 based on the calculated concentration of hydrogen carbonate ion (HCO _3- ⁾ of the liquid 40 and the concentration of the calculated hydrogen sulfite ion ShI of the discharged liquid 46. A may be calculated.

The substance amount calculation unit 74 includes a measured value of the amount of hydrogen carbonate ion (HCO _3- ⁾ contained in the liquid 40 and introduced into the reaction tower 10 per unit time, and is contained in the waste liquid 46 from the reaction tower 10. The pH coefficient A of the liquid 40 may be calculated based on the measured value of the amount of hydrogen sulfite ion ShI discharged per unit time. The pH coefficient A of the liquid 40 may be a value obtained by dividing the measured value of the amount of hydrogen carbonate ion (HCO _3- ⁾ by the measured value of the amount of hydrogen sulfite ion ShI.

The output control unit 73 is based on the pH coefficient A of the liquid 40 calculated by the substance amount calculation unit 74, the substance amount of the alkaline ion AkI of the liquid 40, and the substance amount of the hydrogen sulfite ion ShI of the drainage 46. The output of the power unit 50 may be controlled. The output control unit 73 may control the output of the power device 50 based on the pH coefficient A, the first factor S1, and the second factor S2. The output control unit 73 controls the output of the power device 50 based on the pH coefficient A of the liquid 40, the substance amount of the alkaline ion AkI of the liquid 40, and the substance amount of the hydrogen sulfite ion ShI of the drainage 46. As a result, the output control unit 73 can control the output of the power device 50 in consideration of the influence of the pH of the liquid 40.

The output control unit 73 outputs the power device 50 so that the substance amount of the alkaline ion AkI of the liquid 40 becomes larger than the product of the pH coefficient A of the liquid 40 and the substance amount of the hydrogen sulfite ion ShI of the drainage 46. May be controlled. The first factor S1, the second factor and the pH coefficient A may satisfy the relationship of the following formula (3).

The output control unit 73 controls the output of the power device 50 so as to satisfy the relationship of the equation (3), so that the exhaust gas treatment device 100 has a sulfur (S) concentration of, for example, 2.0 to 2.5% by weight. Even when the power unit 50, the first pump 60, the second pump 62, the purifying agent storage unit 75, etc. are designed on the assumption that they are operated with C heavy oil, the pH of the drainage 46 is a regulated value. And the concentration of sulfur dioxide (SO ₂ ) or the like in the purifying gas 34 is easy to satisfy the regulation value.

In order to set the pH of the drainage 46 to 7.0, the pH coefficient A may be 2.0 or more and 2.33 or less. When the exhaust gas treatment device 100 is a marine scrubber, the sulfur concentration Ds and the consumption Cs of the fuel 96 hardly change during the voyage of the ship. Therefore, by controlling the output Ps of the power device 50, the first factor S1 and the second factor S2 can easily satisfy the relationship of the equation (3).

FIG. 7 is a flowchart showing an example of a method of controlling the pH of the drainage 46 and a method of controlling the output Ps of the power unit 50 according to one embodiment of the present invention. Step S100 is a step of determining whether the first factor S1, the second factor S2, and the pH coefficient A satisfy the relationship represented by the formula (3). In step S100, the substance amount calculation unit 74 may determine whether the first factor S1, the second factor S2, and the pH coefficient A satisfy the relationship shown in the equation (3).

If it is determined in step S100 that the first factor S1, the second factor S2 and the pH coefficient A satisfy the relationship shown in the formula (3), the exhaust gas treatment device 100 may continue the operation. If it is determined in step S100 that the first factor S1, the second factor S2, and the pH coefficient A do not satisfy the relationship represented by the formula (3), the control method proceeds to step S102.

Step S102 is a step of controlling the pH of the drainage 46. In step S102, at least one of the flow rate control unit 70, the storage amount control unit 86, the mixing ratio control unit 84, and the purifying agent supply amount control unit 77 may control the pH of the drainage 46. When the flow rate control unit 70 controls the pH of the drainage liquid 46, the flow rate control unit 70 may control the pH of the drainage liquid 46 by controlling the flow rate of the liquid 40. When the storage amount control unit 86 controls the pH of the drainage 46, the storage amount control unit 86 controls the pH of the drainage 46 by controlling the amount of the drainage 46 stored in the storage unit 87. good. When the mixing ratio control unit 84 controls the pH of the drainage 46, the mixing ratio control unit 84 controls the mixing ratio of a part of the liquid 40 and at least a part of the drainage 46 to control the drainage 46. The pH may be controlled. When the purifying agent supply amount control unit 77 controls the pH of the drainage liquid 46, the purifying agent supply amount control unit 77 may control the pH of the drainage liquid 46 by controlling the supply amount of the purifying agent 78.

The predetermined set value in the substance amount of the alkaline ion AkI of the liquid 40 calculated by the substance amount calculation unit 74 is set as the set value X'. The set value X'is the maximum value of the pH adjusting ability of the second factor S2.

The substance amount of the alkaline ion AkI of the liquid 40 calculated by the substance amount calculation unit 74 is defined as the substance amount X. The amount of substance X represents the pH adjusting ability of the second factor S2. The amount of substance X is the supply capacity of the liquid 40 by the first pump 60, the storage capacity of the drainage 46 by the storage unit 87, the maximum flow rate of the liquid 40 controlled by the mixing ratio control unit 84, and the purifying agent supply amount control unit. It is determined by the supply capacity of the purifying agent 78 by 77.

The flow rate control unit 70 may control the flow rate of the liquid 40 so that the amount of substance X is less than the set value X'. The storage amount control unit 86 may control the amount of the drainage 46 so that the substance amount X is less than the set value X'. The mixing ratio control unit 84 may control the mixing ratio of a part of the liquid 40 and at least a part of the drainage 46 so that the substance amount X becomes less than the set value X'. The purifying agent supply amount control unit 77 may control the supply amount of the purifying agent 78 so that the substance amount X becomes less than the set value X'.

Step S104 is a step of determining whether the amount of substance X is less than the set value X'. In step S104, the substance amount calculation unit 74 may determine whether the substance amount X is less than the set value X'. If it is determined in step S104 that the amount of substance X is less than the set value X', the control method returns to step S100. If it is determined in step S104 that the amount of substance X is equal to or greater than the set value X', the control method proceeds to step S106.

Step S106 is a step of controlling the output Ps of the power unit 50. In step S106, the substance amount calculation unit 74 may control the output Ps of the power device 50, and the substance amount calculation unit 74 notifies the user of the exhaust gas treatment device 100 of a notification (guidance) for controlling the output Ps of the power device 50. You may send it. In step S106, the output control unit 73 may reduce the output Ps of the power unit 50 to be smaller than the output Ps when the amount of substance X is equal to or greater than the set value X'. The control method returns to step S100 after the output Ps of the power unit 50 is controlled.

In step S100, the substance amount calculation unit 74 may again determine whether the first factor S1, the second factor S2, and the pH coefficient A satisfy the relationship shown in the equation (3). When the output Ps of the power unit 50 is reduced, the first factor S1 is likely to be reduced as shown in the equation (1). Therefore, the first factor S1, the second factor S2, and the pH coefficient A can easily satisfy the relationship shown in the formula (3).

FIG. 8 is a diagram showing an example of the route of the ship 200. In FIG. 8, port A and port B are the port from which the vessel 200 departs and the port from which the vessel 200 arrives, respectively. The distance between the port A and the port B is defined as the distance d1. In this example, the reaction tower 10 is mounted on the ship 200.

The output control unit 73 may control the output of the power unit 50 based on the navigation schedule of the ship 200 and the substance amount of the hydrogen sulfite ion ShI of the drainage 46 calculated by the substance amount calculation unit 74. The output control unit 73 may control the output of the power device 50 based on the distance d1 and the amount of substance of the hydrogen sulfite ion ShI.

FIG. 9 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to one embodiment of the present invention. The exhaust gas treatment device 100 of this example is different from the exhaust gas treatment device 100 shown in FIG. 6 in that it further includes a position information acquisition unit 81. The position information acquisition unit 81 acquires the current position PS of the ship 200. The position information acquisition unit 81 is, for example, a global positioning system (GPS (Global Positioning System)).

FIG. 10 is a diagram showing another example of the route of the ship 200. In this example, it is assumed that the vessel 200 is currently navigating the current position PS. The distance between the port A and the current position PS is defined as the distance dd1. The distance between the current position PS and the port B is defined as the distance dd2. The sum of the distance dd1 and the distance dd2 is the distance d1.

The output control unit 73 is a power device 50 based on the current position of the ship 200 acquired by the position information acquisition unit 81 and the substance amount of the hydrogen sulfite ion ShI of the drainage 46 calculated by the substance amount calculation unit 74. You may control the output of. The output control unit 73 may control the output of the power device 50 based on the distance dd2 and the amount of substance of the hydrogen sulfite ion ShI.

FIG. 11 is a diagram showing another example of the route of the ship 200. In this example, the ship 200 navigates the first sea area A1 where the pH regulation value of the drainage 46 is the first pH and the second sea area A2 where the pH regulation value of the drainage 46 is the second pH. In this example, the second pH is greater than the first pH. That is, the pH regulation in the second sea area A2 is stricter than the pH regulation in the first sea area A1. In FIG. 11, the route of the ship 200 is indicated by an arrow.

In FIG. 11, the boundary between the first sea area A1 and the second sea area A2 is shown by a broken line. The position of the intersection of the route of the ship 200 and the boundary between the first sea area A1 and the second sea area A2 is defined as the position C. It is assumed that the vessel 200 is currently navigating the position PS in the first sea area A1.

While the ship 200 is navigating in the first sea area A1, the output control unit 73 may reduce the output of the power unit 50 before the ship 200 is navigating in the second sea area A2. Since the second pH is higher than the first pH, the output of the power unit 50 is reduced before the ship 200 navigates the second sea area A2, so that the ship 200 has entered the second sea area A2 from the first sea area A1. At the time point, the pH of the drainage 46 tends to be less than the second pH.

When the ship 200 is navigating in the first sea area A1, the position information acquisition unit 81 (see FIG. 9) may acquire the current position PS of the ship 200. The distance between the current position PS and the position C is defined as the distance d3. The distance d3 is the distance between the current position PS and the second sea area A2.

The output control unit 73 may control the output of the power unit 50 based on the distance d3 between the first sea area A1 and the second sea area A2. By controlling the output of the power unit 50 based on the distance d3, the output control unit 73 controls the pH of the effluent 46 to be less than the second pH when the ship 200 invades from the first sea area A1 to the second sea area A2. It becomes easy to become.

While the ship 200 is navigating in the first sea area A1, before the ship 200 is navigating in the second sea area A2, the flow rate control unit 70, the storage amount control unit 86, the mixing ratio control unit 84, and the purifying agent supply amount control unit 77. At least one may control the pH of the effluent 46. While the ship 200 is navigating in the first sea area A1, the flow rate control unit 70 may increase the flow rate of the liquid 40, and the storage amount control unit 86 may increase the amount of the drainage 46 stored in the storage unit 87. , The mixing ratio control unit 84 may increase the ratio of the liquid 40 in the mixing ratio of a part of the liquid 40 and at least a part of the drainage 46, and the purifying agent supply amount control unit 77 may increase the supply amount of the purifying agent 78. You may increase it. As a result, the pH of the effluent 46 tends to be lower than the second pH when the ship 200 invades the first sea area A1 to the second sea area A2.

FIG. 12 is a diagram showing another example of the route of the ship 200. In this example, it is assumed that the vessel 200 is currently navigating in the second sea area A2. In this example, it is assumed that the vessel 200 sails in the second sea area A2 and then sails in the first sea area A1. This example differs from the example shown in FIG. 11 in these respects. In FIG. 12, the route of the vessel 200 is indicated by an arrow.

While the ship 200 is navigating in the second sea area A2, the output control unit 73 may increase the output of the power unit 50 before the ship 200 is navigating in the first sea area A1. Since the first pH is smaller than the second pH, the output of the power unit 50 is increased before the ship 200 navigates the first sea area A1, so that the ship 200 has entered the first sea area A1 from the second sea area A2. At the time point, the pH of the drainage 46 tends to be less than the first pH.

When the ship 200 is navigating in the second sea area A2, the position information acquisition unit 81 (see FIG. 9) may acquire the current position PS of the ship 200. The distance between the current position PS and the position C is defined as the distance d4. The distance d4 is the distance between the current position PS and the first sea area A1.

The output control unit 73 may control the output of the power unit 50 based on the distance d4 between the first sea area A1 and the second sea area A2. By controlling the output of the power unit 50 based on the distance d4, the output control unit 73 controls the pH of the effluent 46 to be less than the first pH when the ship 200 enters the first sea area A1 from the second sea area A2. It becomes easy to become.

While the ship 200 is navigating in the second sea area A2, before the ship 200 is navigating in the first sea area A1, the flow rate control unit 70, the storage amount control unit 86, the mixing ratio control unit 84, and the purifying agent supply amount control unit 77. At least one may control the pH of the effluent 46. While the ship 200 is navigating in the second sea area A2, the flow rate control unit 70 may reduce the flow rate of the liquid 40, and the storage amount control unit 86 may reduce the amount of the drainage 46 stored in the storage unit 87. , The mixing ratio control unit 84 may reduce the ratio of the liquid 40 in the mixing ratio of a part of the liquid 40 and at least a part of the drainage 46, and the purifying agent supply amount control unit 77 may reduce the supply amount of the purifying agent 78. It may be reduced. As a result, the pH of the drainage 46 tends to be lower than the first pH when the ship 200 invades the first sea area A1 from the second sea area A2.

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

The order of execution of operations, procedures, steps, steps, etc. in the equipment, system, program, and method shown in the claims, description, and drawings is particularly "before" and "prior to". It should be noted that it can be realized in any order unless the output of the previous process is used in the subsequent process. Even if the claims, the description, and the operation flow in the drawings are explained using "first", "next", etc. for convenience, it means that it is essential to carry out in this order. is not.

10 ... reaction tower, 11 ... exhaust gas inlet, 12 ... trunk pipe, 13 ... branch pipe, 14 ... ejection part, 15 ... side wall, 16 ... bottom surface, 17 ... ... Exhaust gas discharge port, 18 ... Gas treatment unit, 19 ... Liquid discharge port, 20 ... Drain pipe, 22 ... Introduction pipe, 23 ... Pipe, 24 ... Introduction pipe, 25 ... pipe, 30 ... exhaust gas, 32 ... exhaust gas introduction pipe, 34 ... purifying gas, 40 ... liquid, 46 ... drainage, 47 ... drainage, 50 ... Power unit, 60 ... 1st pump, 62 ... 2nd pump, 70 ... Flow control unit, 72 ... Valve, 73 ... Output control unit, 74 ... Material amount calculation unit, 75 ... Purifying agent storage unit, 76 ... Valve, 77 ... Purifying agent supply amount control unit, 78 ... Purifying agent, 79 ... Valve, 81 ... Position information acquisition unit, 82. Alkaline ion concentration measuring unit, 83 ... valve, 84 ... mixing ratio control unit, 85 ... gas supply unit, 86 ... storage amount control unit, 87 ... storage unit, 88 ... 2nd pH meter, 89 ... 1st pH meter, 91 ... Exhaust gas sulfur concentration measuring unit, 92 ... Exhaust gas amount measuring unit, 93 ... Hydrogen sulfite ion concentration measuring unit, 94 ... Purifying gas sulfur Concentration measuring unit, 95 ... Output measuring unit, 96 ... Fuel, 97 ... Fuel supply unit, 98 ... Fuel consumption measuring unit, 100 ... Exhaust gas treatment device, 200 ... Ship

Claims

A reaction tower in which the exhaust gas discharged by a power unit and containing sulfur is introduced and a liquid for treating the exhaust gas is supplied.
A substance amount calculation unit for calculating the amount of hydrogen sulfite ion in the waste liquid treated with the exhaust gas in the reaction tower, and a substance amount calculation unit.
An output control unit that controls the output of the power unit,
Equipped with
The output control unit controls the output of the power unit based on the substance amount of hydrogen sulfite ion in the drainage calculated by the substance amount calculation unit.
Exhaust gas treatment equipment.
Further, an exhaust gas sulfur concentration measuring unit for measuring the sulfur concentration of the exhaust gas introduced into the reaction tower is provided.
The substance amount calculation unit calculates the substance amount of hydrogen sulfite ion in the waste liquid based on the sulfur concentration of the exhaust gas.
The exhaust gas treatment device according to claim 1.
Further provided with a purified gas sulfur concentration measuring unit for measuring the sulfur concentration of the purified gas in which the exhaust gas is treated with the liquid.
The substance amount calculation unit calculates the substance amount of hydrogen sulfite ion in the effluent based on the sulfur concentration of the purification gas.
The exhaust gas treatment apparatus according to claim 1 or 2.
Further, a fuel consumption measuring unit for measuring the fuel consumption for operating the power unit is provided.
The substance amount calculation unit calculates the substance amount of hydrogen sulfite ion in the effluent based on the consumption amount of the fuel.
The exhaust gas treatment apparatus according to any one of claims 1 to 3.
Further, an output measuring unit for measuring the output of the power unit is provided.
The substance amount calculation unit calculates the substance amount of hydrogen sulfite ion in the effluent based on the output of the power unit measured by the output measurement unit.
The exhaust gas treatment apparatus according to any one of claims 1 to 4.
Further provided with an exhaust gas amount measuring unit for measuring the amount of the exhaust gas discharged by the power unit, the exhaust gas amount measuring unit is further provided.
The substance amount calculation unit calculates the substance amount of hydrogen sulfite ion in the effluent based on the amount of the exhaust gas measured by the exhaust gas amount measuring unit.
The exhaust gas treatment apparatus according to any one of claims 1 to 5.
Further provided with a hydrogen sulfite ion concentration measuring unit for measuring the hydrogen sulfite ion concentration of the drainage liquid is provided.
The substance amount calculation unit calculates the substance amount of hydrogen sulfite ion in the drainage solution based on the hydrogen sulfite ion concentration in the drainage solution.
The exhaust gas treatment apparatus according to any one of claims 1 to 6.
The substance amount calculation unit further calculates the substance amount of the alkaline ion of the liquid, and then
The output control unit controls the output of the power unit based on the substance amount of the alkali ion of the liquid and the substance amount of the hydrogen sulfite ion of the drainage, which are calculated by the substance amount calculation unit.
The exhaust gas treatment apparatus according to any one of claims 1 to 7.
Further, a flow rate control unit for controlling the flow rate of the liquid is provided.
The substance amount calculation unit calculates the substance amount of the alkali ion of the liquid based on the flow rate of the liquid controlled by the flow rate control unit.
The exhaust gas treatment apparatus according to claim 8.
Further, an alkali ion concentration measuring unit for measuring the alkali ion concentration of the liquid is provided.
The substance amount calculation unit calculates the amount of substance of the alkali ion of the liquid based on the alkali ion concentration of the liquid.
The exhaust gas treatment apparatus according to claim 8 or 9.
A storage unit that stores at least a part of the drainage
A storage amount control unit that controls the amount of the drainage stored in the storage unit,
Further prepare
The substance amount calculation unit calculates the substance amount of the alkaline ion of the liquid based on the amount of the drainage controlled by the storage amount control unit.
The exhaust gas treatment apparatus according to any one of claims 8 to 10.
Further, a mixing ratio control unit for controlling a mixing ratio of a part of the liquid and at least a part of the drainage is provided.
The substance amount calculation unit calculates the substance amount of the alkaline ion of the liquid based on the mixing ratio controlled by the mixing ratio control unit.
The exhaust gas treatment apparatus according to any one of claims 8 to 11.
Further provided with a purifying agent supply amount control unit that controls the supply amount of the purifying agent that is supplied to at least one of the liquid and the drainage liquid and removes at least a part of hydrogen sulfite ions in the drainage liquid.
The substance amount calculation unit calculates the substance amount of the alkaline ion of the liquid based on the supply amount of the purifying agent controlled by the purifying agent supply amount control unit.
The exhaust gas treatment apparatus according to any one of claims 8 to 12.
The substance amount calculation unit calculates the pH coefficient of the liquid based on the hydrogen ion concentration of the liquid, and calculates the pH coefficient of the liquid.
The output control unit is based on the pH coefficient of the liquid calculated by the substance amount calculation unit, the substance amount of the alkali ion of the liquid, and the substance amount of hydrogen sulfite ion of the drainage liquid. Control the output of the power unit,
The exhaust gas treatment apparatus according to any one of claims 8 to 13.
The output control unit controls the output of the power unit so that the substance amount of the alkaline ion of the liquid becomes larger than the product of the pH coefficient of the liquid and the substance amount of the hydrogen sulfite ion of the drainage liquid. The exhaust gas treatment apparatus according to claim 14.
A flow rate control unit that controls the flow rate of the liquid,
A storage amount control unit that controls the amount of the drainage stored in the storage unit that stores a part of the drainage, and a storage amount control unit.
A mixing ratio control unit that controls the mixing ratio of at least a part of the liquid and at least a part of the drainage liquid.
A purifying agent supply amount control unit that controls the supply amount of a purifying agent that is supplied to at least one of the liquid and the drainage liquid and removes at least a part of hydrogen sulfite ions in the drainage liquid.
Further prepare
The substance amount calculation unit includes the flow rate of the liquid controlled by the flow rate control unit, the amount of the drainage liquid controlled by the storage amount control unit, the mixing ratio controlled by the mixing ratio control unit, and The substance amount of the alkali ion of the liquid is calculated based on at least one of the supply amount of the purifying agent controlled by the purifying agent supply amount control unit.
The flow control unit controls the flow rate of the liquid or the storage amount control so that the substance amount of the alkaline ion of the liquid calculated by the substance amount calculation unit becomes less than a predetermined set value. The unit controls the amount of the drainage, the mixing ratio control unit controls the mixing ratio, or the purifying agent supply amount control unit controls the supply amount of the purifying agent.
The exhaust gas treatment apparatus according to claim 8.
The substance amount calculation unit calculates the pH coefficient of the liquid based on the hydrogen ion concentration of the liquid, and calculates the pH coefficient of the liquid.
In the output control unit, the substance amount of the alkali ion of the liquid calculated by the substance amount calculation unit is the pH coefficient of the liquid and the substance of the hydrogen sulfite ion of the drainage calculated by the substance amount calculation unit. If it is less than the product of quantity, it reduces the output of the power unit.
The exhaust gas treatment apparatus according to claim 16.
The reaction tower is mounted on a ship and
The output control unit controls the output of the power unit based on the navigation schedule of the ship and the substance amount of hydrogen sulfite ion of the effluent calculated by the substance amount calculation unit.
The exhaust gas treatment apparatus according to any one of claims 1 to 17.
Further equipped with a position information acquisition unit for acquiring the current position of the ship,
The output control unit controls the output of the power unit based on the current position of the ship acquired by the position information acquisition unit.
The exhaust gas treatment apparatus according to claim 18.
The ship navigates the first sea area where the pH regulation value of the drainage liquid is the first pH and the second sea area where the pH regulation value of the drainage liquid is the second pH larger than the first pH.
While the ship is navigating in the first sea area, the output control unit reduces the output of the power unit before the ship is navigating in the second sea area.
The exhaust gas treatment apparatus according to claim 19.
The ship navigates the first sea area where the pH regulation value of the drainage liquid is the first pH and the second sea area where the pH regulation value of the drainage liquid is the second pH larger than the first pH.
While the ship is navigating in the second sea area, the output control unit increases the output of the power unit before the ship is navigating in the first sea area.
The exhaust gas treatment apparatus according to claim 19.
The output control unit controls the output of the power unit based on the distance between the current position of the ship and the second sea area while the ship is navigating in the first sea area, and the ship controls the output of the power unit. The exhaust gas treatment device according to claim 20 or 21, which controls the output of the power unit based on the distance between the current position of the ship and the first sea area while navigating in a sea area.