KR20220116318A - exhaust gas purifier - Google Patents

Abstract

It makes it a subject to provide the technique which can wash|clean the pollutant in the seawater path|route containing a scrubber with a simpler structure.
In order to solve this problem, an exhaust gas purification apparatus 1 according to an embodiment of the present disclosure includes a scrubber 10 for purifying exhaust gas of a main equipment engine 100 of a ship using seawater, and a ship; It includes an external drainage introduction part 70 that is discharged from the boiler 200 or the water production device 300, etc. mounted on the , and introduces alkaline drainage having a relatively high pH (hydrogen ion index) or alkalinity into the scrubber 10 .

Description

exhaust gas purifier

The present disclosure relates to an exhaust gas purification apparatus.

DESCRIPTION OF RELATED ART Conventionally, the exhaust gas purification apparatus (scrubber system) using the scrubber which absorbs sulfur oxide (SOx) in the exhaust gas of a marine engine into seawater as sulfuric acid is known (for example, refer patent document 1).

Since seawater is used in the scrubber system, there is a possibility that the inside may be contaminated by marine organisms and the like in the seawater (hereinafter, “contaminants”).

On the other hand, in Patent Document 2, for example, by electrolyzing seawater to generate an electrolyte containing an oxidant and hydrogen, marine organisms are killed, and then neutralized with a reducing agent to drain out of the ship. The technique is disclosed. According to this technique, it is possible to suppress contamination of the scrubber system by marine organisms.

Japanese Patent Laid-Open No. 2004-81933 Japan Registered Utility Model No. 3171387

However, the technology requires a power supply facility and power supply for electrolyzing seawater. In addition, the above technique requires the supply of ancillary equipment and reducing agent for neutralizing seawater with a reducing agent at the time of drainage. Therefore, there is a possibility that the equipment cost (initial cost) and the operating cost become relatively large.

Then, in consideration of the said subject, it aims at providing the technique which can wash|clean the contaminant in the seawater path|route containing a scrubber with a simpler structure.

In order to achieve the above object, in one embodiment of the present disclosure, a scrubber for purifying exhaust gas of an engine of a ship using seawater, and a hydrogen ion index or alkalinity discharged from a predetermined device mounted on the ship are relatively There is provided an exhaust gas purification apparatus including a drainage inlet for introducing high drainage into the scrubber.

According to the above-mentioned embodiment, the technique which can wash|clean the contaminant in the seawater path|route containing a scrubber with a simpler structure is provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the 1st example of an exhaust gas purification apparatus.
2 is a diagram illustrating an example of a junction.
3 is a flowchart schematically showing a first example of a control process related to washing of a seawater path.
4 is a diagram showing a second example of the exhaust gas purification apparatus.
5 is a diagram showing a third example of the exhaust gas purification apparatus.
6 is a flowchart schematically showing a second example of a control process related to washing of a seawater path.
7 is a flowchart schematically showing a third example of control processing related to the washing of the seawater path.
8 is a diagram illustrating an example of a method for controlling a drug infusion pump.
9 is a diagram showing a fourth example of the exhaust gas purification apparatus.
10 is a diagram showing a fifth example of the exhaust gas purification apparatus.
11 is a diagram showing a sixth example of the exhaust gas purification apparatus.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment is described with reference to drawings.

[First Example of Exhaust Gas Purification Device]

A first example of the exhaust gas purification apparatus 1 according to the present embodiment will be described with reference to Figs.

<configuration>

1 is a diagram showing a first example of an exhaust gas purification apparatus 1 according to the present embodiment. 2 is a view showing an example of the merging part 73 .

The exhaust gas purification apparatus 1 is mounted on a ship together with the main appliance engine 100 , the boiler 200 , the water production apparatus 300 , and the like. Hereinafter, "ship" means a ship on which the exhaust gas purification apparatus 1 is mounted, unless otherwise specified.

The exhaust gas purification apparatus 1 purifies the exhaust gas discharged from the main engine engine 100 and discharges it to the outside through the chimney of the ship.

The main device engine 100 propels the ship by rotating the propeller. The main machine engine 100 is, for example, a diesel engine capable of using heavy C oil as a fuel. The exhaust gas of the main machine engine 100 is discharged to the exhaust path 110 .

The exhaust path 110 branches into the main path 120 connected to the scrubber 10 of the exhaust gas purification apparatus 1, and the bypass path 130 which bypasses the scrubber 10. As shown in FIG. The branch is provided with a switching valve 140 .

The switching valve 140 may switch whether the exhaust gas is introduced into the main path 120 or the bypass path 130 .

The boiler 200 (an example of a predetermined device) generates steam as a heating source using distilled water purified by the water production apparatus 300 . In addition, the boiler 200 discharges a portion of the boiler water in order to suppress the concentration of water inside (hereinafter, "boiler water") during the steam generation process. Since a chemical for preventing corrosion of the boiler 200 is added to the distilled water introduced into the boiler 200, the boiler water (jet water) discharged from the boiler 200 has a relative pH (potential of hydrogen: hydrogen ion index). high (high pH water). The relatively high pH means, for example, as described later, when wastewater (boiler water) is introduced into the seawater supplied to the scrubber 10, the pH at which the SOx absorption performance in the scrubber 10 can be improved. It means that a predetermined criterion (eg, a lower limit value) of is exceeded.

The water manufacturing apparatus 300 (an example of a predetermined device) generates distilled water using seawater pulled up from the outside of the ship, and discharges concentrated seawater (concentrated seawater) as drainage. Drainage (concentrated seawater) of the water production device 300 has a relatively high alkalinity as the alkaline substances of the seawater are concentrated. Relatively high alkalinity means, for example, when wastewater (concentrated seawater) is introduced into the seawater supplied to the scrubber 10, as will be described later, the alkalinity that can improve the SOx absorption performance in the scrubber 10 It means that a predetermined criterion (eg, a lower limit value) of is exceeded.

In this example, the exhaust gas purification apparatus 1 draws up seawater from the outside of the ship, purifies the exhaust gas using seawater inside the scrubber 10, and absorbs the SOx discharged from the scrubber 10. discharged to the outside of the vessel. That is, in this example, the scrubber system of an open loop system is employ|adopted as the exhaust gas purification apparatus 1 . The same applies to the second example described later.

As shown in FIG. 1 , the exhaust gas purification device 1 includes a scrubber 10 , a seawater supply unit 20 , a seawater discharge unit 30 , a Variable Voltage Variable Frequency (VVVF) inverter 40 , an external drainage introduction unit 70 . ), a pressure gauge 80 , a level switch 82 , and a control device 90 .

The scrubber 10 purifies the exhaust gas by absorbing SOx contained in the exhaust gas of the main machine engine 100 using seawater supplied by the seawater supply unit 20 . Specifically, the scrubber 10 has a spray for spraying seawater as exhaust gas therein, and SOx is absorbed in the seawater sprayed from the spray. After purification (after desulfurization) that has passed through the scrubber 10 , the exhaust gas is discharged to the outside of the ship through the chimney, and seawater absorbing SOx is discharged from the scrubber 10 to the seawater discharge unit 30 .

The seawater supply unit 20 supplies seawater to the scrubber 10 . The seawater supply unit 20 includes a suction path 20A, a seawater pump 20B, and a discharge path 20C.

The suction path 20A passes the seawater sucked by the seawater pump 20B. In this example, the suction path 20A is connected in such a way that seawater can pass between the water intake port outside a ship, and the suction port of the seawater pump 20B. The suction path 20A is constituted by, for example, a tube (pipe). Hereinafter, the same may be applied to the suction path 20C or the seawater discharge unit 30 .

The seawater pump 20B sucks seawater from the suction path 20A and discharges it to the discharge path 20C. The seawater pump 20B is driven by electric power supplied from the VVVF inverter 40 under the control of the control device 90 .

The seawater discharged from the seawater pump 20B passes through the discharge path 20C. The discharge path 20C is connected in such a way that seawater can pass between the discharge port of the seawater pump 20B and the seawater inlet of the scrubber 10 .

The seawater discharge unit 30 is a path for discharging seawater after purifying the exhaust gas from the scrubber 10 . In this example, the seawater discharge unit 30 discharges the seawater discharged from the scrubber 10 to the outside of the vessel.

The VVVF inverter 40 drives the seawater pump 20B under the control of the control device 90 . Specifically, the VVVF inverter 40 generates AC power of a predetermined voltage and frequency by using the power supplied from the power source in the ship and outputs it to the seawater pump 20B. A signal regarding the operating state of the VVVF inverter 40 is read by the control device 90 .

The external drainage introduction part 70 (an example of the drainage introduction part) is an external device of the exhaust gas purification apparatus 1, that is, alkaline drainage with relatively high pH or drainage with relatively high alkalinity (hereinafter, “alkali drain”) is introduced into the scrubber 10 . Thereby, it destroys and kills the cell walls of marine organisms attached to the pipe line, valve, spray, etc. of the inside of the scrubber 10 through which alkaline drainage passes and the seawater discharge unit 30 downstream thereof, and further washes with the pressure of the flow. have. In addition, when alkaline wastewater is introduced into the scrubber 10 in a state in which the exhaust gas does not pass through the scrubber 10, the alkali wastewater does not come into contact with the high-temperature exhaust gas, and the seawater discharge part inside and downstream of the scrubber 10 (30) It is possible to wash away salt components or black grime components adhering to the pipeline. In addition, in this example, the external drainage introduction unit 70 introduces drainage (spout water) of the boiler 200 and drainage (concentrated seawater) of the water production device 300 into the seawater supply unit 20, and the seawater supply unit 20 ) through the scrubber (10). Thereby, the exhaust gas purification apparatus 1 can wash|clean marine organisms, salt components, etc. adhering to the pipeline etc. of the upstream of the scrubber 10 (seawater supply part 20). Hereinafter, a liquid containing alkaline wastewater used for cleaning the seawater path including the scrubber 10 may be referred to as "cleaning liquid".

The external drain inlet 70 includes an inlet path 71 , a check valve 72 , a merging section 73 , a storage tank 74 , a liquid delivery pump 75 , and a VVVF inverter 76 .

The introduction path 71 is a path for introducing alkaline drainage of an external device into the seawater supply unit 20 . The introduction path 71 is constituted by, for example, a tube (pipe). The introduction path 71 includes introduction paths 71A and 71B.

The introduction path 71A is a path for introducing alkaline wastewater (spout water) of the boiler 200 into the scrubber 10 .

The introduction path 71B is a path for introducing alkaline wastewater (concentrated seawater) of the water production apparatus 300 into the scrubber 10 .

The check valve 72 is arranged with the direction toward the seawater supply unit 20 in the introduction path 71 in the forward direction, and is configured to allow the forward flow of the fluid (alkali drain) while preventing the reverse flow. Accordingly, the check valve 72 can prevent the alkaline drainage or seawater from flowing backward in the introduction path 71 from the seawater supply unit 20 toward the discharge source of the alkaline drainage. The check valve 72 includes a check valve 72A provided in the introduction path 71A, and a check valve 72B provided in the introduction path 71B.

The merging unit 73 is provided at a connection position between the introduction path 71 and the discharge path 20C of the seawater supply unit 20, and the alkaline wastewater introduced through the introduction path 71 joins the discharge path 20C. . The merging portion 73 includes a merging portion 73A provided at a connection position between the introduction path 71A and the discharge path 20C, and a merging portion provided at a connection position between the introduction path 71B and the discharge path 20C. 73B).

For example, as shown in FIG. 2 , the merging portions 73A and 73B have a relatively thin nozzle shape compared to the discharge path 20C, and alkaline drainage is discharged from the nozzle-shaped outlet to the scrubber of the discharge path 20C. (10) It is arranged to flow out along the side direction. Accordingly, when only alkaline wastewater is introduced into the scrubber 10, the merging portions 73A and 73B can suppress pressure loss in the merging portions 73A and 73B. In addition, the merging portions 73A and 73B may introduce alkaline wastewater into the discharge path 20C at a relatively large flow rate. Thus, contaminants adhering to the interior of the discharge path 20C, the scrubber 10, and the seawater discharge unit 30 can be properly washed out by the pressure of the alkaline drainage flow. In addition, when alkaline drainage is introduced into the scrubber 10 together with the seawater discharged from the seawater pump 20B, the alkaline drainage is joined at a relatively large (higher) speed compared to the seawater flow in the discharge path 20C by joining the ejector ( ejector) can promote agitation (mixing) with seawater due to the effect.

Returning to FIG. 1 , the storage tank 74 (an example of a drainage tank) stores alkaline drainage of an external device. Storage tank 74 includes storage tanks 74A and 74B.

The storage tank 74A stores the alkaline wastewater (spout water) of the boiler 200 . The storage tank 74A is an overflow type, for example.

The storage tank 74B stores alkaline wastewater (concentrated seawater) of the water production apparatus 300 . The storage tank 74B is an overflow type, for example.

The liquid delivery pump 75 (an example of a waste water introduction pump) sucks in alkaline waste water from the storage tank 74 and discharges it toward the scrubber 10 . As a result, the alkaline wastewater is pumped toward the junction 73 . The liquid delivery pump 75 is driven by electric power supplied from the VVVF inverter 76 under the control of the control device 90 . The liquid delivery pump 75 includes liquid delivery pumps 75A and 75B.

The liquid delivery pump 75A pressurizes blow water of the boiler 200 stored in the storage tank 74A toward the merging part 73A.

The liquid delivery pump 75B pressurizes the concentrated seawater of the water production apparatus 300 stored in the storage tank 74B toward the merging part 73B.

The VVVF inverter 76 drives the liquid delivery pump 75 under the control of the control device 90 . VVVF inverter 76 includes VVVF inverters 76A and 76B. Signals related to the operating states of the VVVF inverters 76A and 76B are read by the control device 90 .

The VVVF inverter 76A generates AC power of a predetermined voltage and frequency by using power supplied from a power supply in the ship and outputs it to the liquid delivery pump 75A.

The VVVF inverter 76B generates AC power of a predetermined voltage and frequency by using the power supplied from the power source in the ship and outputs it to the liquid delivery pump 75B.

The introduction path 71A includes paths 71A1 to 71A3.

The path 71A1 connects the jet water outlet of the boiler 200 and the inlet of the storage tank 74A.

The path 71A2 connects the outlet of the storage tank 74A and the suction port of the liquid delivery pump 75A.

The path 71A3 connects the discharge port of the liquid delivery pump 75A and the merging portion 73A (the discharge path 20C). A check valve 72A is disposed in path 71A3.

The introduction path 71B includes paths 71B1 to 71B3.

The path 71B1 connects the concentrated seawater drain of the water production apparatus 300 and the inlet of the storage tank 74B.

The path 71B2 connects the outlet of the storage tank 74B and the suction port of the liquid delivery pump 75B.

The path 71B3 connects the discharge port of the liquid delivery pump 75B and the merging portion 73B (discharge path 20C). A check valve 72B is disposed in the path 71B3.

The pressure gauge 80 (an example of the third measuring unit) measures the fluid pressure in the vicinity of the inlet of the scrubber 10 in the discharge path 20C. A signal (measured signal) corresponding to the measured value of the pressure gauge 80 (hereinafter, “pressure measured value”) is read by the control device 90 .

The level switch 82 outputs a signal regarding the liquid level of the storage tank 74 . For example, the level switch 82 may include two level switches. Specifically, one level switch sets the predetermined height position between the upper limit height position of the storage tank 74 and the lower limit height position (that is, a height position that can be determined to be empty) as a threshold value, and the liquid level of the storage tank 74 is set as a threshold value. A signal corresponding to any one of a relatively high state and a low state may be output. The other level switch can output a signal indicating whether or not the storage tank 74 is empty by setting the lower limit height position of the storage tank 74 as a threshold value. Hereinafter, an output signal indicating a state in which the liquid level of the storage tank 74 is relatively high is referred to as a "High signal", an output signal indicating a relatively low state is referred to as a "Low signal", and the storage tank 74 is empty. An output signal indicating that there is an "empty signal" is sometimes called. The output signal of the level switch 82 is read by the control device 90 .

The level switch 82 includes level switches 82A and 82B for outputting signals relating to the liquid level of the storage tanks 74A and 74B, respectively.

The control device 90 controls the exhaust gas purification device 1 . The function of the control device 90 may be realized by any hardware, or a combination of any hardware and software, or the like. The control device 90 is a computer including a memory device such as a central processing unit (CPU), a random access memory (RAM), a non-volatile auxiliary storage device such as a read only memory (ROM), and an interface device for input/output with the outside. is composed around The control device 90 realizes various functions by, for example, loading various programs installed in the auxiliary storage device into the memory device and executing them on the CPU.

On the other hand, the function of the control device 90 may be realized by being distributed to a plurality of control devices.

<Operation about cleaning>

3 is a flowchart schematically showing a first example of control processing related to seawater path cleaning by the control device 90 . This flowchart may be repeatedly executed, for example, for each predetermined control cycle.

As shown in FIG. 3 , in step S102 , the control device 90 determines whether or not to start cleaning the seawater path including the scrubber 10 . For example, the control device 90 determines whether a cleaning command has been received. A cleaning instruction may be received, for example, from a user (eg, a ship operator) through a predetermined input device. Further, the cleaning command may be automatically output at a predetermined timing. When the cleaning command is received, the control device 90 sets the cleaning end flag to OFF, and the exhaust gas purification device 1 performs seawater path cleaning including the scrubber 10 in an operation mode (hereinafter, "" cleaning mode"), and the flow advances to step S104. On the other hand, when the cleaning command is not received, the control device 90 ends the flow chart processing of the meeting.

In step S104, the control device 90 determines whether the main machine engine 100 has stopped. The operating state of the main unit engine 100 may be, for example, an aspect that is periodically read from another control device that controls the main unit engine 100 . The control device 90 proceeds to step S106 if the main unit engine 100 is not stopped, and proceeds to step S108 if the main unit engine 100 is stopped.

In step S106 , the control device 90 switches the switching valve 140 so that the exhaust gas of the main machine engine 100 passes through the bypass path 130 . The switching of the switching valve 140 may be realized by the control device 90 outputting a control signal to the switching valve 140 , or by outputting a request signal to another control device capable of controlling the switching valve 140 . may be realized. Accordingly, it is possible to prevent the exhaust gas of the main device engine 100 from passing through the scrubber 10 .

When the processing of step S106 is completed, the control device 90 proceeds to step S108.

In step S108, the control device 90 makes a judgment regarding the output signals of the level switches 82A and 82B. The control device 90 proceeds to step S110 when the output signal of at least one of the level switches 82A and 82B is a Low signal, and proceeds to step S114 when both of the output signals are a High signal.

In step S110, the control device 90 outputs a control signal to the VVVF inverter 40 to enter a state in which the seawater pump 20B is operated at the lowest rotational speed. Thereby, seawater is supplied to the scrubber 10 from the seawater pump 20B.

When the processing of step S110 is completed, the control device 90 proceeds to step S112.

In step S112, the control device 90 outputs a control signal to the VVVF inverters 76A and 76B to put the liquid delivery pumps 75A and 75B into a state of operating at a relatively low rotational speed. Thereby, a relatively small (small) flow rate of alkaline wastewater (spout water and concentrated seawater) from the liquid delivery pumps 75A and 75B is introduced into the discharge path 20C, and together with the seawater from the seawater pump 20B, the scrubber ( 10) is supplied.

On the other hand, when only the liquid level of either one of the storage tanks 74A and 74B is relatively low, the control device 90 sets only the corresponding one of the liquid delivery pumps 75A and 75B to a relatively low rotational speed, The other may be set to a relatively high rotational speed.

When the processing of step S112 is completed, the control device 90 proceeds to step S118.

That is, when the remaining capacity of the storage tank 74 is relatively small, the control device 90 mixes the alkaline wastewater with seawater while reducing the introduction amount of the alkaline wastewater and supplies it to the scrubber 10 . Thereby, the exhaust gas purification apparatus 1 can ensure the flow volume as a washing|cleaning liquid while suppressing the exhaustion of alkali wastewater. In addition, by mixing alkaline wastewater with seawater, the ammonia component of seawater (ammonium: NH ₄ ⁺ ) can be converted into non-dissociated ammonia (NH ₃ ) having a relatively high sterilization ability. Thus, the exhaust gas purification apparatus 1 can enhance the effect of killing marine organisms in the seawater path including the scrubber 10 by the cleaning liquid.

On the other hand, in step S114, the control device 90 puts the seawater pump 20B in a stopped state. Accordingly, seawater is not supplied from the seawater pump 20B to the scrubber 20B.

In addition, the control device 90 operates the seawater pump 20B at a rotation speed higher than the minimum rotation speed in step S110, and in step S114, a rotation speed lower than the rotation speed of step S110 (eg, the minimum rotation speed). water) to operate the seawater pump 20B. That is, when the liquid level of the storage tanks 74A and 74B is relatively high, the control device 90 supplies seawater with a smaller flow rate from the seawater pump 20B to the scrubber 10 than when the liquid level is relatively low. may be

When the processing of step S114 is completed, the control device 90 proceeds to step S116.

In step S116, the control device 90 puts the liquid delivery pumps 75A and 75B into a state in which they operate at a relatively high rotational speed.

When the processing of step S116 is completed, the control device 90 proceeds to step S118.

That is, when the remaining capacity of the storage tank 74 is relatively large, the control device 90 makes the introduction amount of the alkali wastewater relatively large. Thereby, the flow rate as a washing|cleaning liquid can be ensured only by alkaline drainage. Therefore, it is not necessary to introduce seawater from outside the ship, and it is possible to suppress a situation in which new marine organisms from the outside enter the seawater path including the scrubber 10 by the introduction of seawater.

In step S118 , the control device 90 sets a timer defining the upper limit of the cleaning time of the seawater path including the scrubber 10 .

When the processing of step S118 is completed, the control device 90 proceeds to step S120.

In step S120, the control device 90 determines whether or not the measured value of the pressure gauge 80 is equal to or less than a prescribed value. The prescribed value (an example of the third reference value) is, for example, that contaminants adhering to the seawater path including the scrubber 10 have been sufficiently cleaned (removed), that is, it can be determined that the washing of the seawater path is complete. As the upper limit of the pressure, it may be predefined through experiments or simulations. When the measured value of the pressure gauge 80 is equal to or less than the prescribed value, the control device 90 determines that the cleaning of the seawater path is complete, and proceeds to step S138, and when not equal to or less than the prescribed value, proceeds to step S122.

In step S122, the control device 90 makes a judgment regarding the output signals of the level switches 82A and 82B. When the output signals of both of the level switches 82A and 82B are the High signal or the Low signal, the control device 90 proceeds to step S124. On the other hand, when the output signal of at least one of the level switches 82A and 82B is an Empty signal, the control device 90 proceeds to step S138 to forcibly terminate the cleaning of the seawater path.

That is, the control device 90 forcibly terminates the washing of the seawater path only when the storage amount of both the storage tanks 74A and 74B is gone, and when only the storage amount of one of the storage tanks 74A, 74B is lost, alkaline drainage is introduced from the other side. Cleaning can be continued.

In step S124, the control device 90 determines whether the timer has expired. When the timer has expired, the control device 90 determines that the upper limit of the washing time of the seawater path has elapsed, and proceeds to step S138, and when the timer has not expired, proceeds to step S126.

In step S126, the control device 90 determines to continue washing of the seawater path, and maintains the washing end flag OFF.

Steps S128 to SS136 are the same processing as steps S108 to S116 described above. For example, the storage amount of the storage tanks 74A and 74B decreases as the alkaline drainage is introduced into the scrubber 10, or the discharge amount of the alkaline drainage decreases depending on the operating conditions of the boiler 200 and the water production device 300. It can be increased by stretching. In this regard, the control device 90 may have an opportunity to correct the operating state of the seawater pump 20B and the liquid delivery pumps 75A, 75B based on the output change of the level switches 82A, 82B.

When the process of step S132 or step S136 is completed, the control device 90 returns to step S120 and repeats the process after step S120.

Meanwhile, steps S128 to S136 may be omitted. In this case, when the process of step S126 is completed, the control apparatus 90 returns to step S120 and repeats the process after step S120.

On the other hand, in step S138, the control device 90 stops the liquid delivery pumps 75A and 75B and sets the cleaning end flag to ON.

When the processing of step S138 is completed, the control device 90 proceeds to step S140.

In step S140, the control device 90 determines whether the main machine engine 100 is stopped. The control device 90 proceeds to step S142 when the main machine engine 100 is stopped, and proceeds to step S144 when not stopped.

In step S142, the control device 90 changes the operation mode of the exhaust gas purification apparatus 1 from the cleaning mode to an operation mode (hereinafter, "re operation standby mode").

In the restart standby mode, the exhaust gas purification apparatus 1 maintains a state in which the inside of the seawater path including the scrubber 10 is filled with a cleaning liquid containing alkaline drainage. For example, the control device 90 outputs a command to close a predetermined valve provided in the seawater discharge unit 30 , and via the scrubber 10 from the stopped seawater pump 20B to the seawater discharge unit 30 . ), the seawater path leading to the predetermined valve may be in a state in which the washing liquid cannot flow out. In this way, the exhaust gas purification device 1 can suppress the reproduction of the marine life due to the action of the filled washing liquid even when the marine life remaining in the seawater path including the scrubber 10 exists.

When the processing is completed in step S142, the control device 90 ends the flow chart processing of the conference.

On the other hand, in step S144 , the control device 90 returns the rotation speed of the seawater pump 20B to the rotation speed for supplying seawater necessary for purifying the exhaust gas in the scrubber 10 . Thus, the control device 90 switches the switching valve 140 so that the exhaust gas of the main machine engine 100 passes through the main path 120 . Accordingly, the exhaust gas of the main unit engine 10 in operation is introduced into the scrubber 100, and the exhaust gas purification apparatus 1 operates in an operation mode for purifying the exhaust gas of the main unit engine 100 in operation (hereinafter, " normal operating mode").

When the processing in step S144 is completed, the control device 90 ends the flow chart processing of the conference.

<action>

As described above, in this example, the exhaust gas purification apparatus 1 discharges the alkaline wastewater stored in the storage tanks 74A and 74B in the open loop scrubber system by means of the liquid delivery pumps 75A and 75B, respectively. It can be introduced into the path (20C). Thereby, the exhaust gas purification apparatus 1 can introduce alkaline wastewater into the scrubber 10 through the discharge path 20C, and can wash the seawater path including the scrubber 10.

Specifically, in this example, the exhaust gas purifying apparatus 1 introduces alkaline wastewater (jet water from the boiler 200 and concentrated seawater from the water production apparatus 300) of in-ship equipment into the scrubber 10 . Accordingly, the exhaust gas purification device 1 uses the alkali drainage of the existing in-ship equipment (equipment) to remove the marine organisms attached to the seawater path such as the seawater discharge unit 30 in the scrubber 10 and the downstream thereof. It can be destroyed and cleaned. Thus, it is possible to suppress the equipment cost (initial cost), operating cost, etc. required for washing the seawater path including the scrubber 10 . The same applies to Examples 2 to 6, which will be described later.

In addition, in the present example, the exhaust gas cleaning apparatus 1 introduces alkaline drainage of in-ship equipment into the scrubber 10 through the seawater supply unit 20 . Thereby, it is possible to clean by killing marine organisms attached to the seawater supply unit 20 upstream from the scrubber 10 . The same applies to Examples 2 to 6, which will be described later.

In addition, in this example, the exhaust gas purification apparatus 1 stores alkaline wastewater in the storage tank 74 and introduces the alkaline wastewater from the storage tank 74 into the scrubber 10 . Accordingly, even when the timing at which cleaning in the seawater path including the scrubber 10 is performed is different from the timing at which the alkaline wastewater is discharged from the apparatus such as the boiler 200 or the water production apparatus 300, the amount of alkali required for cleaning is different. Drainage can be prepared. The same applies to Examples 2 to 6, which will be described later.

In addition, in this example, the exhaust gas purification apparatus 1 uses alkaline wastewater discharged from a plurality of appliances (boiler 200 and water production apparatus 300 ). In this way, it is possible to more reliably prepare alkaline drainage of an amount required for washing. The same applies to Examples 2 to 6, which will be described later.

In addition, in this example, the exhaust gas purification apparatus 1 pressurizes alkaline wastewater toward the scrubber 10 using the liquid delivery pump 75 . Accordingly, even when it is impossible to supply alkaline drainage by potential energy due to the positional relationship between the storage tank 74 and the seawater path including the scrubber 10, alkaline drainage can be reliably introduced into the scrubber 10. have. The same applies to Examples 2 to 6, which will be described later.

In addition, in this example, the exhaust gas purification apparatus 1 introduces seawater into the scrubber 10 together with alkaline drainage. Thereby, since the pH of seawater rises relatively by the action of alkaline drainage, the density|concentration of non-dissociated ammonia can be raised. Thus, it is possible to further improve the sterilization ability by the cleaning solution containing alkaline drainage. The same applies to Examples 2 to 6, which will be described later.

In the present example, the exhaust gas purification apparatus 1 introduces a cleaning liquid containing alkaline wastewater into the scrubber 10 in a state in which the exhaust gas does not pass through the scrubber 10 . Thereby, since the washing|cleaning liquid which washed the salt component does not come into contact with high temperature exhaust gas, the salt component in the seawater path|route containing the scrubber 10 can be removed. In addition, it is possible to wash the black dirt component in the seawater path including the scrubber. The same applies to Examples 2 to 6, which will be described later.

In addition, in the exhaust gas purification apparatus 1 in this example, as the liquid level of the storage tank 74 is relatively low, the amount of alkaline wastewater introduced into the scrubber 10 is relatively small (less), and the seawater scrubber The amount supplied in (10) is relatively large (larger). Thereby, while suppressing the depletion of alkaline drainage during the washing mode, it is possible to secure the flow rate of the washing liquid required for washing in the seawater path including the scrubber 10 . In addition, when the storage amount of alkaline wastewater is relatively large, it is possible to suppress new invasion of marine organisms from the outside by reducing the supply amount of seawater or making it zero. The same applies to Examples 2 to 6, which will be described later.

[Second example of exhaust gas purification device]

Next, with reference to FIG. 4, the 2nd example of the exhaust gas purification apparatus 1 which concerns on this embodiment is demonstrated. Hereinafter, parts different from the first example will be mainly described, and descriptions of the same or corresponding contents as those of the first example may be simplified or omitted in some cases.

<configuration>

4 is a diagram showing a second example of the exhaust gas purification apparatus 1 according to the present embodiment.

As shown in FIG. 4 , the exhaust gas purification device 1 includes a scrubber 10, a seawater supply unit 20, a seawater discharge unit 30, a VVVF inverter 40, It includes an external drain inlet 70 , a pressure gauge 80 , a level switch 82 , and a control device 90 .

As in the case of the first example described above, the external drainage introduction unit 70 includes an introduction path 71 , a check valve 72 , a merging unit 73 , a storage tank 74 , a liquid delivery pump 75 , and a VVVF inverter. (76).

The introduction path 71 includes paths 711 to 713 , and is configured in such a way that the jet water of the boiler 200 and the concentrated seawater of the water production apparatus 300 are merged.

Path 711 includes paths 711A and 711B.

The path 711A connects the jet water outlet of the boiler 200 and the inlet of the storage tank 74 .

The path 711B connects the concentrated seawater drain of the water production apparatus 300 and the inlet of the storage tank 74 .

A path 712 connects the outlet of the storage tank 74 and the inlet of the liquid delivery pump 75 .

The path 713 connects the discharge port of the liquid delivery pump 75 and the merging part 73 (discharge path 20C).

Unlike the case of the first example described above, there is one check valve 72 and is disposed in the path 713 .

Unlike the case of the first example described above, the merging portion 73 is one, and is disposed at a connection position between the path 713 and the discharge path 20C.

Unlike the case of the first example described above, the storage tank 74 is one, and stores both the jet water of the boiler 200 and the concentrated seawater of the water production apparatus 300 . As a result, alkaline wastewater from a plurality of devices (boiler 200 and water production apparatus 300 ) can be stored in one water storage tank 74 . Thus, while securing the function of storing alkaline wastewater of the external device, the configuration of the external wastewater introduction unit 70 can be simplified to reduce the equipment cost (initial cost).

The liquid delivery pump 75 is different from the case of the first example described above, the alkaline drainage of the storage tank 74 , that is, the mixed drainage of the jet water of the boiler 200 and the concentrated seawater of the water production apparatus 300 . It sucks and pressurizes toward the scrubber 10 (discharge path 20C). Thus, in this example, alkaline drainage of a plurality of appliances (boiler 200 and water production device 300) can be introduced into the seawater supply unit 20 by one liquid delivery pump 75 and VVVF inverter 76. have. Thus, the configuration of the external drainage introduction part 70 can be simplified to reduce the equipment cost.

The VVVF inverter 76 is one, different from the case of the first example described above, and drives the liquid delivery pump 75 under the control of the control device 90 .

Different from the case of the first example described above, there is one level switch 82 and outputs a signal relating to the liquid level of one storage tank 74 .

<Operation about cleaning>

The control apparatus 90 can perform the control process (steps S102 - S144) of FIG. 3 similarly to the case of the 1st example mentioned above.

In this case, in step S108, the control device 90 proceeds to step S110 when the output signal of the level switch 82 is a low signal, and proceeds to step S114 when it is a high signal. The same applies to step S128. Further, in step S122, the control device 90 proceeds to step S124 when the output signal of the level switch 82 is a high signal or a low signal, and proceeds to step S138 when it is an empty signal. The same applies to the case where the control processing of Fig. 3 is performed according to the configuration of the fourth and sixth examples, which will be described later.

Thereby, the exhaust gas purification apparatus 1 brings about the same effect|action and effect as the case of the 1st example mentioned above.

<action>

As described above, in this example, the exhaust gas purification device 1 can introduce alkaline wastewater stored in the storage tank 74 into the discharge path 20C by the liquid delivery pump 75 in the open-loop scrubber system. have. Thereby, the exhaust gas purification apparatus 1 can introduce alkaline wastewater into the scrubber 10 through the discharge path 20C, and can wash the seawater path including the scrubber 10.

Specifically, in this example, alkaline drainage from a plurality of devices (boiler 200 and water production device 300) is concentrated in one path, and the seawater supply unit 20 (discharge path 20C) is passed through the scrubber ( 10) is introduced. Accordingly, it is possible to simplify the configuration of the external drainage introduction part 70 and to reduce the equipment cost. The same applies to Examples 4 and 6, which will be described later.

In addition, in this example, alkaline wastewater from a plurality of apparatuses (boiler 200 and water production apparatus 300 ) is stored in one storage tank 74 . Thereby, the facility cost can be suppressed, realizing the function of storing the alkali wastewater from a some apparatus. The same applies to Examples 4 and 6, which will be described later.

[Third example of exhaust gas purification device]

Next, with reference to FIGS. 5-8, the 3rd example of the exhaust gas purification apparatus 1 which concerns on this embodiment is demonstrated. Hereinafter, parts different from the above-described first example will be mainly described, and descriptions of the same or corresponding contents of the first example and the like may be simplified or omitted in some cases.

<configuration>

5 is a diagram showing a third example of the exhaust gas purification apparatus 1 according to the present embodiment.

In this example, the exhaust gas purification apparatus 1 neutralizes seawater that has absorbed SOx discharged from the scrubber 10 and reuses the seawater in the scrubber 10, unlike in the case of the first example and the like described above. circulate That is, in this example, the scrubber system of the closed loop system is used as the exhaust gas purification apparatus 1 . The same applies to Examples 4 to 6, which will be described later.

As shown in FIG. 5 , the exhaust gas purification device 1 includes a scrubber 10, a seawater supply unit 20, a seawater discharge unit 30, a VVVF inverter 40, It includes an external drain inlet 70 , a pressure gauge 80 , a level switch 82 , and a control device 90 . In addition, the exhaust gas purification apparatus 1 differs from the case of the above-mentioned first example etc., the turbidity removal apparatus 25, the chemical|medical agent injection pump 50, the VVVF inverter 60, and the water quality meter 84. , a water quality system 86 , and a water quality system 88 .

The seawater supply unit 20 includes a suction path 20A, a seawater pump 20B, and a discharge path 20C, as in the case of the first example and the like described above. In addition, the seawater supply unit 20 includes a storage tank 20D differently from the case of the first example described above.

The storage tank 20D (an example of a seawater tank) stores seawater to be circulated in the scrubber 10 . The storage tank 20D is connected to the suction path 20A, and the seawater in the storage tank 20D is supplied to the scrubber 10 by the power of the seawater pump 20B. In addition, the storage tank 20D is connected to the seawater discharge unit 30 , and the seawater discharged from the scrubber 10 returns to the storage tank 20D through the seawater discharge unit 30 .

In addition, the storage tank 20D is an overflow type, for example. The overflowed seawater is discharged into the sea outside the vessel.

On the other hand, seawater to be circulated to the scrubber 10 is introduced into the seawater supply unit 20 from the inside of the sea outside the ship by using another pump in advance.

The turbidity removal apparatus 25 removes the contaminant components (for example, dust particles, particulate matter, etc.) of the seawater of the storage tank 20D by circulating seawater between the storage tank 20D.

The drug infusion pump 50 (an example of the drug introduction part) pumps seawater (hereinafter, "replenishment water") or a solution of an alkaline substance (hereinafter, "alkali agent") outside the ship to the storage tank 20D. Thereby, the SOx absorption performance can be improved (restored) by neutralizing the seawater of the storage tank 20D in which the SOx absorption performance fell with make-up water or an alkali agent. Hereinafter, the case in which an alkali agent is used will be mainly described. The drug infusion pump 50 is driven by electric power supplied from the VVVF inverter 60 under the control of the control device 90 .

The alkali agent is, for example, an aqueous solution such as sodium hydroxide (NaOH), sodium carbonate (Na ₂ CO ₃ ), magnesium hydroxide (Mg(OH) ₂ ), calcium oxide (CaO), or calcium carbonate (CaCO ₃ ). In addition, the alkaline agent may be an aqueous solution of another kind of alkaline substance.

The VVFF inverter 60 drives the medicament infusion pump 50 under the control of the control device 90 . Specifically, the VVVF inverter 60 generates AC power of a predetermined voltage and frequency by using the power supplied from the power source in the ship and outputs it to the drug injection pump 50 . A signal regarding the operating state of the VVVF inverter 60 is read by the control device 90 .

The external drainage introduction unit 70 includes an introduction path 71 , a storage tank 74 , a liquid delivery pump 75 , and a VVVF inverter 76 , as in the case of the first example and the like described above.

The introduction path 71 includes the introduction paths 71A and 71B as in the case of the first example and the like described above.

The introduction path 71A includes paths 71A1 to 71A3 as in the case of the first example described above.

The path 71A3 connects the discharge port of the liquid delivery pump 75A and the inlet of the storage tank 20D. Thereby, the jet water of the boiler 200 pumped through the liquid delivery pump 75A can be introduced into the storage tank 20D.

The introduction path 71B includes paths 71B1, 71B2, and 71B3 as in the case of the first example described above.

The path 71B3 connects the discharge port of the liquid delivery pump 75B and the inlet of the storage tank 20D. Accordingly, the concentrated seawater of the water production apparatus 300 pumped through the liquid delivery pump 75B can be introduced into the storage tank 20D.

The storage tank 74 includes storage tanks 74A and 74B as in the case of the first example described above.

The liquid delivery pump 75 includes liquid delivery pumps 75A and 75B as in the case of the first example described above.

The VVVF inverter 76 includes VVVF inverters 76A and 76B as in the case of the first example described above.

The water quality meter 84 (an example of the first measurement unit) measures the water quality (pH) of the seawater in the discharge path 20C, that is, the seawater supplied to the scrubber 10 . The signal (measured signal) corresponding to the measured value of the water quality meter 84 (henceforth "scrubber inlet pH measured value") is read by the control device 90 .

The water quality meter 86 (an example of the second measurement unit) measures the seawater quality (salinity concentration) of the seawater supply unit 20 (discharge path 20C). The signal (measured signal) corresponding to the measured value of the water quality meter 86 (henceforth "salinity concentration measured value") is read by the control device 90 .

The water quality meter 88 measures the water quality (pH) of the drainage that overflows from the storage tank 20D and is discharged into the sea outside the ship. The signal (measured signal) corresponding to the measured value of the water quality meter 86 (henceforth "scrubber wastewater pH measured value") is read by the control device 90 .

<Operation about cleaning>

6 and 7 are flowcharts schematically showing the second example and the third example of the control process related to the seawater flow path washing by the control device 90 . These flowcharts may be repeatedly executed, for example, for each predetermined control cycle. 8 is a diagram illustrating an example of a method for controlling the drug infusion pump 50 . Specifically, FIG. 8 is a diagram showing an example of pH control using the chemical infusion pump 50 by the control device 90 .

For example, the control device 90 can perform the control processing (steps S102 to S144) of FIG. 3 similarly to the case of the first example and the like described above.

Further, for example, the control device 90 can perform the control processing (steps S202 to S228) of FIG. 6 .

As shown in FIG. 6 , steps S202 to S206 are the same as the processing of steps S102 to S106 in FIG. 3 , and thus description is omitted.

When it is determined in step S204 that the engine has stopped or the processing is completed in step S206, the control device 90 proceeds to step S208.

In step S208, the control device 90 sets the seawater pump 20B to a state in which it operates at the lowest rotational speed. Accordingly, seawater from the storage tank 20D having a relatively high total sulfide concentration by absorbing SOx in the scrubber 10 as well as alkaline drainage can be introduced into the seawater path including the scrubber 10 . Thus, it is possible to increase the effect of inhibiting reproduction and killing of marine organisms, in particular, shellfish.

When the processing of step S208 is completed, the control device 90 proceeds to step S210.

In step S210, the control device 90 outputs a control signal to the VVVF inverters 76A and 76B to operate the liquid delivery pumps 75A and 75B at a predetermined rotational speed. Thereby, alkaline wastewater (spout water and concentrated seawater) at a predetermined flow rate is introduced into the storage tank 20D from the liquid delivery pumps 75A and 75B, and is combined with seawater in the storage tank 20D from the seawater pump 20B together with the scrubber. (10) is supplied. Thus, it is possible to improve the sterilization ability of the washing liquid by increasing the pH of the seawater and making the concentration of undissociated ammonia relatively high. The predetermined rotational speed may be predefined, for example, as a rotational speed capable of ensuring a flow rate of the cleaning liquid required for alkaline drainage pumped by pressure from the liquid delivery pumps 75A and 75B.

When the processing of step S210 is completed, the control device 90 proceeds to step S212.

The processing of steps S212 to 228 is the same as steps S118 to S126 and S138 to S144 in Fig. 3, and thus description thereof is omitted.

When the processing of step S226 or step S228 is completed, the control device 90 ends the flow chart processing of the meeting.

In addition, for example, the control apparatus 90 can perform the control process of FIG. 7 (steps S302 - S332).

As shown in FIG. 7 , steps S302 to S308 are the same as those of steps S202 to S208 in FIG. 6 , and thus description thereof is omitted.

If it is determined in step S304 that the engine has stopped, or when the processing in step S308 is completed, the control device 90 proceeds to step S310.

In step S310, the control device 90 starts pH control (see Fig. 8).

As shown in FIG. 8 , the control device 90 includes a control unit 901 , a control unit 902 , and a selection unit 903 as a configuration related to pH control.

The control part 901 can perform feedback control (for example, PID control) regarding the deviation based on the scrubber inlet pH measurement value by the water quality meter 84 input, and a prescribed|prescribed pH control value. The pH management value (an example of the first reference value) is, for example, the pH required for the temperature of the non-dissociated ammonia of the washing liquid containing seawater, alkaline drainage, and alkali agent supplied to the scrubber 10 to rise to a predetermined standard. It may be a lower limit. Specifically, the control unit 901 controls the scrubber inlet pH value to be close to 0 in a range where the measured scrubber inlet pH value is equal to or greater than the pH management value, so that the command value (hereinafter, "Rotation speed command value") is output. In this way, the control unit 901 can realize control to increase the concentration of non-dissociated ammonia in the washing liquid to a predetermined standard (hereinafter, “non-dissociated ammonia concentration increase control”).

The control unit 902 can perform feedback control (PID control) regarding the deviation based on the inputted scrubber drainage pH measurement value by the water quality meter 88 and a prescribed pH regulation value. The pH regulation value may be, for example, a regulation value (lower limit) regulated in international regulation on the pH value of seawater discharged from a ship, or a self-regulation value set to a value larger than the regulation value. Specifically, the control unit 902 outputs the rotation speed command value of the drug infusion pump 50 corresponding to the introduction amount of the alkali agent so that the deviation approaches 0 in a range in which the scrubber drainage pH measurement value is larger than the pH regulation value. . In this way, the control unit 902 can implement a regulation corresponding to the regulation value of the wastewater discharged from the ship (hereinafter, “control value corresponding to the wastewater drainage”).

The selection unit 903 selects a larger rotation speed command value (maximum value) among the rotation speed command values output from the control units 901 and 902 and outputs it to the VVVF inverter 60 . Thereby, the VVVF inverter 60 supplies the electric power for making it operate at the rotation speed corresponded to the rotation speed command value to the chemical|medical agent injection pump 50. Thus, the control device 90 can introduce the alkaline agent from the chemical injection pump 50 into the seawater of the storage tank 20D in order to satisfy both the pH management value and the pH regulation value.

In addition, the control device 90 may perform pH control by controlling the liquid delivery pumps 75A and 75B instead of or in addition to controlling the drug infusion pump 50 . For example, the control device 90 performs pH control by controlling the rotation speed of the liquid delivery pumps 75A and 75B to preferentially introduce alkaline wastewater into the storage tank 20D. Then, when the rotation speed exceeding the maximum rotation speed of the liquid delivery pumps 75A and 75B is required, the control device 90 additionally operates the chemical infusion pump 50 to add an alkali agent to the storage tank ( 20D), it is also possible to carry out the pH control control of the aspect introduced. The same may be said for Examples 4 to 6, which will be described later.

In addition, the control device 90 may perform control regarding the salt concentration of the cleaning liquid (hereinafter referred to as "salinity concentration control") instead of or in addition to the pH control. In this case, in step S310, the control device 90 performs a process for starting the salt concentration control instead of or in addition to the process for starting the pH control. Hereinafter, the same may be applied to Examples 4 to 6, which will be described later.

For example, the control apparatus 90 performs feedback control regarding the deviation based on the input measured value (salinity concentration measurement value) of the water quality meter 86, and a salinity concentration management value. The salt concentration control value (an example of the second reference value) may be, for example, a lower limit value of the salt concentration capable of suppressing the growth of halophilus. Specifically, the control device 90 commands the rotation speed of the liquid delivery pumps 75A and 75B corresponding to the introduction amount of the alkali wastewater so that the deviation approaches 0 within a range in which the measured salt concentration value is larger than the salt concentration control value. print the value In particular, the control device 90 can realize a salt concentration management value by controlling the rotation speed of the liquid delivery pump 75B for pumping alkaline wastewater (concentrated seawater of the water production device 300) having a relatively high alkalinity. have. The control device 90 may also control the salt concentration by controlling the medicament infusion pump 50 instead of or in addition to controlling the liquid delivery pumps 75A and 75B. Thereby, the control device 90 can keep the salt concentration of the washing liquid relatively high and suppress the propagation of basophils.

Returning to FIG. 7 , when the processing of step S310 is completed, the control device 90 proceeds to step S312.

Steps S312 to S324 are the same as steps S210 to S222 of FIG. 6, and thus a description thereof will be omitted.

When the processing of step S324 is completed, the control device 90 proceeds to step S326.

In step S326, the control device 90 ends the pH control.

On the other hand, when performing the salinity concentration control, the control device 90 ends the salinity concentration control instead of or in addition to the pH control in step S326.

When the processing of step S326 is completed, the control device 90 proceeds to step S328.

Steps S328 to 332 are the same as the processes of steps S140 to S144 of FIG. 3 and steps S224 to S228 of FIG. 6, and thus description thereof will be omitted.

When the processing in step S330 or S332 is completed, the control device 90 ends the flow chart processing of the meeting.

<action>

As described above, in the present example, the exhaust gas purification apparatus 1 stores alkaline wastewater in the storage tanks 74A and 74B in a closed loop scrubber system, and the alkaline wastewater in the storage tanks 74A and 74B. can be introduced into the storage tank 20D. Thereby, the exhaust gas purification apparatus 1 can introduce alkaline wastewater together with the seawater of the storage tank 20D into the scrubber 10, and can wash the seawater path|route containing the scrubber 10.

Specifically, in this example, the exhaust gas purification apparatus 1 introduces alkaline wastewater into a storage tank 20D in which seawater discharged from the scrubber 10 is stored, and removes the alkali wastewater and the cleaning liquid containing seawater from the scrubber 10 . ) is introduced. Accordingly, the total sulfide concentration of the washing liquid can be relatively high due to the action of the seawater in the storage tank 20D. Thus, it is possible to increase the effect of inhibiting reproduction and killing of marine organisms (shellfish) by the washing liquid. In addition, the non-dissociated ammonia concentration can be relatively increased by raising the pH of the washing liquid containing seawater by alkaline drainage. Thus, the sterilization ability of the cleaning liquid can be improved. In addition, the salt concentration of the washing liquid containing seawater can be raised by alkaline drainage (especially, the concentrated seawater of the water production apparatus 300 having a relatively high alkalinity, etc.). Thus, it is possible to suppress the growth of basophils. The same applies to Examples 4 to 6, which will be described later.

In addition, in the present example, the exhaust gas purification apparatus 1 may further introduce an alkali agent into the cleaning liquid including seawater in the alkaline drainage and storage tank 20D. Thereby, the pH, salt concentration, etc. of a washing|cleaning liquid can be raised further. Thus, the exhaust gas purification apparatus 1 can further improve the sterilization ability of the cleaning liquid, the effect of inhibiting proliferation of basophils, and the like. The same applies to Examples 4 to 6, which will be described later.

In addition, in this example, the exhaust gas purification apparatus 1 controls the liquid delivery pumps 75A and 75B and the chemical injection pump 50 so that the pH of the cleaning liquid containing seawater becomes the pH control value or more, so that alkaline drainage, alkaline Adjust the intake. Thereby, the exhaust gas purification apparatus 1 can maintain the pH state of the cleaning liquid in which the density|concentration of non-dissociated ammonia meets a predetermined|prescribed management standard. Thus, it is possible to maintain the sterilization ability of the cleaning liquid in an appropriate state. The same applies to Examples 4 to 6, which will be described later.

In addition, in this example, the exhaust gas purification device 1 controls the liquid delivery pumps 75A and 75B and the chemical injection pump 50 so that the salt concentration of the washing liquid containing seawater becomes greater than or equal to the salt concentration control value to perform alkaline drainage, Adjust the introduction amount of the alkali agent. Thereby, the exhaust gas purification apparatus 1 can ensure the washing|cleaning liquid whose salt concentration meets predetermined|prescribed management standard. Thus, it is possible to maintain the basophil proliferation inhibitory effect of the washing liquid in an appropriate state. The same applies to Examples 4 to 6, which will be described later.

[Fourth example of exhaust gas purification device]

Next, with reference to FIG. 9, the 4th example of the exhaust gas purification apparatus 1 which concerns on this embodiment is demonstrated. Hereinafter, parts different from the above-described first example will be mainly described, and descriptions of the same or corresponding contents of the first example and the like may be simplified or omitted in some cases.

<configuration>

9 is a diagram showing a fourth example of the exhaust gas purification apparatus 1 according to the present embodiment.

As shown in FIG. 9 , the exhaust gas purification device 1 includes a scrubber 10 , a seawater supply unit 20 , a seawater discharge unit 30 , and a VVVF inverter 40 similarly to the case of the first example and the like described above. , an external drain inlet 70 , a pressure gauge 80 , a level switch 82 , and a control device 90 . In addition, as in the case of the third example described above, the exhaust gas purification device 1 includes a turbidity removal device 25, a chemical injection pump 50, a VVVF inverter 60, a water quality meter 84, a water quality meter 86, a water quality meter 88 .

The external drainage introduction unit 70 includes an introduction path 71 , a storage tank 74 , a liquid delivery pump 75 , and a VVVF inverter 76 , as in the case of the third example described above.

The introduction path 71 includes paths 711 to 713 as in the case of the second example described above.

As in the case of the second example described above, the path 711 includes paths 711A and 711B for introducing each of the jet water from the boiler 200 and the concentrated seawater from the water production tank 300 into the storage tank 74 . include Thereby, the alkaline drainage of the boiler 200 and the water production apparatus 300 can be concentrated in one storage tank 74 .

The path 713 connects the discharge port of the liquid delivery pump 75 and the inlet of the storage tank 20D. Thereby, the alkaline wastewater collected in the storage tank 74 is pressurized by the liquid delivery pump 75 and introduced into the storage tank 20D.

The storage tank 74 is one, as in the case of the second example described above. The storage tank 74 stores both the jet water of the boiler 200 and the concentrated seawater of the water production apparatus 300 .

The liquid delivery pump 75 is one as in the case of the second example described above. The liquid delivery pump 75 sucks in the alkaline drainage of the storage tank 74, that is, the mixed drainage of the jet water of the boiler 200 and the concentrated seawater of the water production apparatus 300, and pressurizes it toward the storage tank 20D.

There is one VVVF inverter 76 as in the case of the second example described above. The VVVF inverter 76 drives the liquid delivery pump 75 under the control of the control device 90 .

There is one level switch 82 as in the case of the second example described above. The level switch 82 outputs a signal regarding the liquid level of one storage tank 74 .

<Operation about cleaning>

The control device 90 can perform the control processing (steps S102 to S144) of FIG. 3 similarly to the case of the first example and the like described above.

In addition, the control apparatus 90 can perform the control process (step S202 - S228) of FIG. 6 similarly to the case of the 3rd example mentioned above.

In addition, the control apparatus 90 can also perform the control process (steps S302 - S332) of FIG. 7 similarly to the case of the 3rd example mentioned above.

In this way, the same operations and effects as those of the first and third examples described above can be achieved.

<action>

As described above, in the present example, the exhaust gas purification apparatus 1 collects and stores alkaline wastewater from a plurality of devices in one storage tank 74 in a closed-loop scrubber system, and the mixed wastewater of the storage tank 74 is stored. can be introduced into the storage tank 20D. Thereby, the exhaust gas purification apparatus 1 can introduce alkaline wastewater together with the seawater of the storage tank 20D into the scrubber 10, and can wash the seawater path|route containing the scrubber 10.

[Fifth example of exhaust gas purification device]

Next, with reference to FIG. 10, the 5th example of the exhaust gas purification apparatus 1 which concerns on this embodiment is demonstrated. Hereinafter, parts different from the above-described first example will be mainly described, and descriptions of the same or corresponding contents of the first example and the like may be simplified or omitted in some cases.

<configuration>

10 is a diagram showing a fifth example of the exhaust gas purification apparatus 1 according to the present embodiment.

As shown in FIG. 10 , the exhaust gas purification device 1 includes a scrubber 10 , a seawater supply unit 20 , a seawater discharge unit 30 , and a VVVF inverter 40 similarly to the case of the first example and the like described above. , an external drain inlet 70 , a pressure gauge 80 , a level switch 82 , and a control device 90 . In addition, the exhaust gas purification apparatus 1 has the turbidity removal apparatus 25, the chemical|medical agent injection pump 50, the VVVF inverter 60, the water quality meter 84, and the water quality meter 86 similarly to the case of the 3rd example etc. mentioned above. ), including the water quality meter (88).

As in the case of the first example described above, the external drainage introduction unit 70 includes an introduction path 71, a check valve 72, a merging portion 73, a storage tank 74, a liquid delivery pump 75, and a VVVF inverter ( 76).

The introduction path 71 includes the introduction paths 71A and 71B as in the case of the first example described above.

The introduction path 71A includes paths 71A1 to 71A3 as in the case of the first example described above.

The introduction path 71B includes paths 71B1 to 71B3 as in the case of the first example described above.

The check valve 72 includes check valves 72A and 72B disposed on the paths 71A3 and 71B3, respectively, as in the case of the first example described above.

The merging portion 73 includes merging portions 73A and 73B provided at the connecting positions of the respective paths 71A3 and 71B3 and the discharge path 20C, as in the case of the first example described above.

The storage tank 74 includes storage tanks 74A and 74B as in the case of the first example described above.

The liquid delivery pump 75 includes liquid delivery pumps 75A and 75B as in the case of the first example described above.

The VVVF inverter 76 includes VVVF inverters 76A and 76B as in the case of the first example described above.

The level switch 82 includes level switches 82A and 82B as in the case of the first example described above.

<Operation about cleaning>

The control device 90 can perform the control processing (steps S102 to S144) of FIG. 3 similarly to the case of the first example and the like described above.

In addition, the control apparatus 90 can perform the control process (step S202 - S228) of FIG. 6 similarly to the case of the 3rd example mentioned above.

In addition, the control apparatus 90 can also perform the control process (steps S302 - S332) of FIG. 7 similarly to the case of the 3rd example mentioned above.

In this way, the same operations and effects as those of the first and third examples described above can be achieved.

<action>

As described above, in the present example, the exhaust gas purification apparatus 1 can introduce alkaline wastewater stored in the storage tank 74 into the discharge path 20C by the liquid delivery pump 75 in the closed-loop scrubber system. have. Accordingly, the exhaust gas purification apparatus 1 can introduce alkaline wastewater into the scrubber 10 through the discharge path 20C to clean the seawater path including the scrubber 10 .

[Sixth example of exhaust gas purification device]

Next, with reference to FIG. 11, the 6th example of the exhaust gas purification apparatus 1 which concerns on this embodiment is demonstrated. Hereinafter, parts different from the above-described first example will be mainly described, and descriptions of the same or corresponding contents of the first example and the like may be simplified or omitted in some cases.

11 is a diagram showing a sixth example of the exhaust gas purification apparatus 1 according to the present embodiment.

As shown in FIG. 11 , the exhaust gas purification apparatus 1 includes a scrubber 10 , a seawater supply unit 20 , a seawater discharge unit 30 , and a VVVF inverter 40 similarly to the case of the first example described above. , an external drain inlet 70 , a pressure gauge 80 , a level switch 82 , and a control device 90 . In addition, the exhaust gas purification apparatus 1 has the turbidity removal apparatus 25, the chemical|medical agent injection pump 50, the VVVF inverter 60, the water quality meter 84, and the water quality meter 86 similarly to the case of the 3rd example etc. mentioned above. ), including the water quality meter (88).

As in the case of the second example described above, the external drainage introduction unit 70 includes an introduction path 71, a check valve 72, a merging unit 73, a storage tank 74, a liquid delivery pump 75, and a VVVF inverter ( 76).

The introduction path 71 includes paths 711 to 713 as in the case of the second example described above.

The path 711 includes paths 711A and 711B for introducing each of the jet water from the boiler 200 and the concentrated seawater of the water production apparatus 300 into the storage tank 74, as in the case of the second example described above. include

The path 713 connects the discharge port of the liquid delivery pump 75 and the merging portion 73 (discharge path 20C) as in the case of the second example described above.

The storage tank 74 is one, similarly to the case of the 2nd example mentioned above, and stores both the jet water of the boiler 200 and the concentrated seawater of the water manufacturing apparatus 300. As shown in FIG.

As in the case of the second example described above, there is one liquid delivery pump 75 , and it sucks alkaline drainage of the storage tank 74 , that is, the mixed drainage of the ejection water of the boiler 200 and the water production apparatus 300 . and pressurized to the discharge path 20C.

There is one VVVF inverter 76 similar to the case of the second example described above, and drives the liquid delivery pump 75 under the control of the control device 90 .

There is one level switch 82 as in the case of the second example described above, and outputs a signal relating to the liquid level of one storage tank 74 .

<Operation about cleaning>

The control device 90 can perform the control processing (steps S102 to S144) of FIG. 3 similarly to the case of the first example and the like described above.

In addition, the control apparatus 90 can perform the control process (step S202 - S228) of FIG. 6 similarly to the case of the 3rd example mentioned above.

In addition, the control apparatus 90 can also perform the control process (steps S302 - S332) of FIG. 7 similarly to the case of the 3rd example mentioned above.

In this way, the same operations and effects as those of the first and third examples described above can be achieved.

<action>

As described above, in the present example, the exhaust gas purification device 1 collects and stores alkaline wastewater from a plurality of devices in one storage tank 74 in a closed-loop scrubber system, and the mixed wastewater of the storage tank 74 is stored. may be introduced into the discharge path 20C. Accordingly, the exhaust gas purification apparatus 1 can introduce alkaline wastewater into the scrubber 10 through the discharge path 20C to clean the seawater path including the scrubber 10 .

[Another example of an exhaust gas purification device]

Next, another example of the exhaust gas purification apparatus 1 which concerns on this embodiment is demonstrated.

Modifications, changes, etc. may be appropriately applied to the exhaust gas purification apparatus 1 of the first to sixth examples described above.

For example, in the above-described first, third, and fifth examples, the exhaust gas purification device 1 uses only the alkaline wastewater of either one of the boiler 200 and the water production device 300 to the seawater supply unit 20 . It may be a configuration introduced as .

Also, for example, in the above-described examples 1 to 6, the exhaust gas purification apparatus 1 may introduce alkaline drainage of other equipment in addition to the alkaline drainage of the boiler 200 and the water production apparatus 300 . There may be a configuration.

In addition, for example, in the second, fourth, and sixth examples described above, the external drainage introduction unit 70 separates the alkaline drainage from the boiler 200 and the water production device 300 into a separate storage tank 74 . It is also possible to collect the alkaline wastewater from each storage tank 74 by a single liquid delivery pump 75 and pressurize it.

Further, for example, in Examples 1 to 6 described above, the exhaust gas purification apparatus 1 may be a hybrid type scrubber system.

Also, for example, in the first to sixth examples described above, the external drainage introduction part 70 does not use the liquid delivery pump 75 , and the original pressures of the boiler 200 and the water production device 300 or Alkaline wastewater can also be introduced to the scrubber 10 using potential energy or the like.

Also, for example, in the first to sixth examples described above, the external drainage introduction unit 70 may directly introduce alkaline drainage into the scrubber 10 instead of the seawater supply unit 20 .

Also, for example, in the above-described first to sixth examples, the external drainage introduction unit 70 may introduce alkaline drainage into the scrubber 10 while the exhaust gas is passing through the scrubber 10 . That is, in the above-described first to sixth examples, the exhaust gas purification apparatus 1 may have an aspect in which the cleaning mode operation can be performed in parallel during the normal operation mode operation.

[Action]

Next, the operation of the exhaust gas purification apparatus 1 according to the present embodiment is generalized.

In the present embodiment, the exhaust gas purification apparatus 1 includes a scrubber 10 and an external drainage introduction part 70 . Specifically, the scrubber 10 purifies the exhaust gas of the main device engine 100 of the ship using seawater. And, the external drainage inlet 70 is discharged from a predetermined device mounted on the ship (for example, the boiler 200 or the water production device 300), the pH or alkalinity of the relatively high alkali drainage scrubber (10) introduced into

As a result, the exhaust gas purification device 1 introduces alkaline drainage into the scrubber 10, thereby destroying and removing the spray inside the scrubber 10, and the cell walls of marine organisms attached to pipes, valves, etc. downstream of the scrubber 10. can do. Therefore, the exhaust gas purification apparatus 1 can wash the pollutants in the seawater path|route containing the scrubber 10 by a simpler structure using the alkali wastewater discharged|emitted from the existing equipment of a ship.

Moreover, in this embodiment, the exhaust gas purification apparatus 1 can be equipped with the seawater supply part 20 which supplies seawater to the scrubber 10. As shown in FIG. In addition, the external seawater introduction unit 70 may introduce alkaline drainage into the scrubber 10 through the seawater supply unit 20 .

As a result, the exhaust gas purification device 1 uses alkaline drainage to not only contaminants in the seawater path inside or downstream of the scrubber 10, but also contaminants in the seawater path including pipelines and valves upstream of the scrubber 10. can be cleaned.

Moreover, in this embodiment, the exhaust gas purification apparatus 1 can be equipped with the seawater supply part 20 which supplies seawater to the scrubber 10. As shown in FIG. In addition, the exhaust gas purification apparatus 1 may introduce seawater supplied by the seawater supply unit 20 and alkaline wastewater introduced by the external seawater introduction unit 70 into the scrubber 10 together.

Thereby, the exhaust gas purification apparatus 1 can make the pH of seawater relatively high by introduce|transducing alkaline wastewater into seawater, and can convert the ammonia component in seawater into non-dissociated ammonia with a relatively high sterilization ability. Thus, the exhaust gas purification apparatus 1 can further enhance the effect of killing marine organisms in the seawater path including the scrubber 10 .

In addition, in the present embodiment, the seawater supply unit 20 includes a storage tank 20D for storing seawater discharged from the scrubber 10 , and may supply seawater from the storage tank 20D to the scrubber 10 .

Thereby, the exhaust gas purification apparatus 1 can use together the seawater of the storage tank 20D, ie, seawater with a relatively high total sulfide concentration through the scrubber 10, in addition to alkaline drainage. Thus, the exhaust gas purification apparatus 1 can further improve the effect of inhibiting the reproduction of shellfish in the seawater path including the scrubber 10, the effect of killing shellfish, and the like.

Moreover, in this embodiment, the exhaust gas purification apparatus 1 may be equipped with the chemical|medical agent injection pump 50 which introduces the alkaline agent which is alkaline into the storage tank 20D.

Thereby, the exhaust gas purification apparatus 1 can use an alkali agent together in addition to alkali drainage. Thus, the exhaust gas purification device 1 further increases the pH of the seawater, thereby further enhancing the effect of killing marine organisms in the seawater path including the scrubber 10 .

In addition, in the present embodiment, the exhaust gas purification apparatus 1 may include a water quality meter 84 that measures the pH of the seawater in the seawater supply unit 20 . And the external wastewater introduction part 70 can adjust the introduction amount of alkali wastewater so that the measured value of the water quality meter 84 may become the pH control value or more.

Thereby, the exhaust gas purification apparatus 1 contains a cleaning liquid (alkali drainage) so as to satisfy a predetermined management standard (above the pH management value) prescribed in advance from the viewpoint of, for example, the cleaning effect (death effect) of marine organisms. The pH of seawater) can be adjusted. Thus, the exhaust gas purification apparatus 1 can more reliably clean the contaminants (marine organisms) in the seawater path including the scrubber 10 .

In addition, in this embodiment, the exhaust gas purification apparatus 1 may be equipped with the water quality meter 84 which measures the pH of the seawater of the seawater supply part 20. As shown in FIG. And the chemical|medical agent injection pump 50 can adjust the introduction amount of an alkali agent so that the measured value of the water quality meter 84 may become a pH control value or more.

Thereby, the exhaust gas purifying apparatus 1 is, for example, a cleaning liquid (alkali drainage and alkaline agent) so as to satisfy predetermined management standards (pH management value or more) prescribed in advance from the viewpoint of the cleaning effect (death effect) of marine organisms. It is possible to adjust the pH of seawater containing In particular, it is preferable in the case where management standards cannot be satisfied only with alkaline drainage. Thus, the exhaust gas purification apparatus 1 can more reliably clean contaminants (marine organisms) in the seawater path including the scrubber 10 .

In addition, in this embodiment, the exhaust gas purification apparatus 1 may be provided with the water quality meter 86 which measures the salt concentration of the seawater of the seawater supply part 20. As shown in FIG. And the external wastewater introduction part 70 can adjust the introduction amount of alkali wastewater so that the measured value of the water quality meter 86 may become the salt concentration control value or more.

In this way, the exhaust gas purification apparatus 1 adjusts, for example, the salt of the washing liquid (seawater containing alkaline wastewater) so as to satisfy a management standard (above the salt concentration control value) prescribed in advance from the viewpoint of suppressing the growth of basophils. The concentration can be adjusted. Therefore, the exhaust gas purification apparatus 1 can wash|clean the contaminant (basophils) in the seawater path|route containing the scrubber 10 more reliably.

In addition, in this embodiment, the exhaust gas purification apparatus 1 can be equipped with the pressure gauge 80 which measures the pressure of the washing|cleaning liquid containing alkaline wastewater introduced into the scrubber 10. As shown in FIG. And the external drainage introduction part 70 can stop the introduction of alkaline drainage so that the measured value of the pressure gauge 80 may become below a prescribed value.

As a result, the exhaust gas purification apparatus 1 determines that the contaminants in the seawater path including the scrubber 10 have been cleaned (removed) with the fact that the pressure of the cleaning liquid introduced into the scrubber 10 is relatively small. , the cleaning process may be terminated.

In addition, in the present embodiment, the external wastewater introduction unit 70 can introduce alkaline wastewater into the scrubber 10 in a state in which the exhaust gas does not pass through the scrubber 10 .

Thereby, in the exhaust gas purification apparatus 1, the washing liquid (seawater containing alkali wastewater and alkaline wastewater) does not come into contact with the high-temperature exhaust gas, and black dirt components and salts in the seawater path including the scrubber 10 are prevented. components can be removed. Thus, the exhaust gas purification apparatus 1 can more appropriately clean the inside of the seawater path including the scrubber 10 .

In the present embodiment, the exhaust gas purification device 1 is configured to purify the exhaust gas, including the scrubber 10, after the alkaline wastewater is stopped from being introduced into the scrubber 10 by the external wastewater introduction unit 70 . The path in which seawater flows can be maintained in a state filled with a washing solution containing alkaline drainage.

Thereby, the exhaust gas purification apparatus 1 can suppress reproduction even when marine organisms (residual organisms) that have not been killed or removed exist.

In addition, in the present embodiment, the external wastewater introduction unit 70 includes a storage tank 74 for storing alkaline wastewater coming from a predetermined device, and a liquid delivery pump for pumping alkaline wastewater from the storage tank 74 toward the scrubber 10 ( 75) may be included.

Thereby, the exhaust gas purification apparatus 1 can store alkali wastewater required for washing|cleaning in advance, and can introduce|transduce it into the scrubber 10 at the timing which washing|cleaning is required.

In addition, in the present embodiment, the storage tank 74 can store alkaline wastewater from a plurality of predetermined devices.

Accordingly, even when using alkaline wastewater from a plurality of predetermined devices (eg, the boiler 200 and the water production apparatus 300 ), it is possible to process with only one storage tank 74 . Thus, the exhaust gas purification apparatus 1 can simplify the configuration while realizing the function of storing alkaline wastewater from a plurality of predetermined devices.

In addition, in the present embodiment, the external wastewater introduction unit 70 can collect alkaline wastewater from a plurality of predetermined devices and introduce it into the scrubber 10 .

Accordingly, the exhaust gas purifying apparatus 1 has a configuration of the external drainage introduction part 70 compared to the case where each drainage is individually introduced into the seawater supply part 20, even when alkaline drainage from a plurality of predetermined devices is used. can be simplified. Thus, the exhaust gas purification apparatus 1 can simplify its configuration while introducing alkaline wastewater from a plurality of predetermined devices.

In addition, in the present embodiment, the external wastewater introduction unit 70 includes a storage tank 74 for storing alkaline wastewater coming from a predetermined device, and a liquid delivery pump for pumping alkaline wastewater from the storage tank 74 toward the scrubber 10 ( 75) may be included. And, in the exhaust gas purification apparatus 1, the smaller the amount of storage in the storage tank 74, the smaller the amount of alkaline waste introduced into the scrubber 10 by the external wastewater introduction part 70 is relatively small, and to the seawater supply part 20 The amount of seawater supplied to the scrubber 10 can be relatively increased.

Thereby, the exhaust gas purification apparatus 1 can ensure the flow volume of a washing|cleaning liquid while suppressing the exhaustion of alkali wastewater.

Although the embodiment has been described in detail above, the present disclosure is not limited to this specific embodiment, and various modifications and changes are possible within the scope of the spirit described in the claims.

Finally, this application claims priority based on Japanese Patent Application No. 2020-136419 filed on August 12, 2020, and the entire contents of Japanese Patent Application No. 2020-136419 are incorporated herein by reference.

1 Exhaust gas purification device
10 scrubber
20 sea water supply
20A suction path
20B sea water pump
20C discharge path
20D storage tank (seawater tank)
25 turret
30 seawater outlet
40 VVVF inverter
50 Drug infusion pump (drug inlet)
60 VVVF inverter
70 External drainage inlet (drainage inlet)
71,71A,71B Introduction route
71A1-71A3 route
Route 71B1-71B3
72,72A,72B check valve
73,73A,73B junction
74,74A,74B storage tank (drainage tank)
75,75A,75B liquid delivery pump (drain inlet pump)
76,76A,76B VVVF inverter
80 pressure gauge (3rd measurement part)
82,82A,82B level switch
84 Water quality meter (first measurement unit)
86 Water quality meter (second measurement unit)
88 water quality meter
90 control unit
100 main unit engine
200 boilers (specified equipment)
300 water production equipment (specified equipment)
Route 711-713
711A, 711B route
901,902 control unit
903 selection

Claims (15)

A scrubber that purifies the exhaust gas of a ship's engine using seawater,
and a wastewater introduction part for introducing wastewater discharged from a predetermined device mounted on the ship and having a relatively high hydrogen ion index or alkalinity into the scrubber. According to claim 1,
It includes a seawater supply unit for supplying seawater to the scrubber,
The exhaust gas purification apparatus in which the wastewater introduction part introduces the wastewater into the scrubber through the seawater supply part. 3. The method of claim 1 or 2,
It includes a seawater supply unit for supplying seawater to the scrubber,
The exhaust gas purification apparatus of claim 1, wherein the seawater supplied by the seawater supply unit and the wastewater introduced by the drainage introduction unit are introduced into the scrubber together. 4. The method of claim 3,
The seawater supply unit includes a seawater tank for storing seawater discharged from the scrubber,
An exhaust gas purification apparatus for supplying seawater from the seawater tank to the scrubber. 5. The method of claim 4,
An exhaust gas purification apparatus including a chemical introduction part for introducing a predetermined alkaline chemical into the seawater tank. 6. The method according to any one of claims 2 to 5,
A first measurement unit for measuring the hydrogen ion index of the seawater of the seawater supply unit,
and the waste gas purifying unit adjusts the introduction amount of the waste water so that the measured value of the first measurement unit is equal to or greater than a first reference value. 6. The method of claim 5,
A first measurement unit for measuring the hydrogen ion index of the seawater of the seawater supply unit,
The drug introduction unit adjusts the introduction amount of the predetermined drug so that the measured value of the first measurement unit is equal to or greater than a first reference value. 8. The method according to any one of claims 2 to 7,
A second measurement unit for measuring the salinity concentration of the seawater of the seawater supply unit,
and the waste gas purifying unit adjusts the amount of waste water introduced so that the measured value of the second measurement unit is equal to or greater than a second reference value. 9. The method according to any one of claims 1 to 8,
and a third measuring unit for measuring the pressure of the cleaning liquid including the drain introduced into the scrubber,
The drainage inlet. When the measured value of the third measurement unit is equal to or less than a third reference value, the introduction of the waste water is stopped. 10. The method according to any one of claims 1 to 9,
The exhaust gas purification apparatus wherein the waste water introduction unit introduces the waste water into the scrubber in a state in which the exhaust gas does not pass through the scrubber. 11. The method of claim 10,
After the introduction of the wastewater into the scrubber is stopped by the wastewater introduction unit, the path in which seawater flows for purifying the exhaust gas, including the scrubber, is maintained in a state filled with the washing liquid containing the wastewater exhaust gas purification device. 12. The method according to any one of claims 1 to 11,
The exhaust gas purification apparatus according to claim 1, wherein the waste water introduction unit includes a drain tank for storing the waste water from the predetermined device, and a waste gas introduction pump for pressurizing the waste water from the drain tank toward the scrubber. 13. The method of claim 12,
and the drain tank stores the waste water from a plurality of the predetermined devices. 14. The method according to any one of claims 1 to 13,
and the waste gas purifying unit collects the waste water from a plurality of the predetermined devices and introduces the waste water into the scrubber. 4. The method of claim 3,
The drain introduction unit includes a drain tank for storing the waste water from the predetermined device, and a waste water introduction pump for pressurizing the waste water from the drain tank toward the scrubber,
The smaller the amount of storage in the drain tank, the smaller the amount of wastewater introduced into the scrubber by the wastewater introduction section, and the larger the amount of seawater supplied to the scrubber by the seawater supply section is relatively large. Device.

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