WO2016147882A1

WO2016147882A1 - Water supply tank, exhaust gas treatment device, and ship

Info

Publication number: WO2016147882A1
Application number: PCT/JP2016/056592
Authority: WO
Inventors: 和久伊藤; 平岡　直大; 中川　貴裕; 哲司上田
Original assignee: 三菱重工業株式会社
Priority date: 2015-03-13
Filing date: 2016-03-03
Publication date: 2016-09-22
Also published as: JP2016168573A; CN107427776A; JP6147786B2; KR20170117143A; KR102059252B1; CN107427776B

Abstract

Provided are a water supply tank, an exhaust gas treatment device, and a ship, wherein a tank main body (51), a drain water discharge line (W3) which supplies, to the tank main body (51), condensed water generated by cooling a combustion gas, a fresh water supply line (W4) for supplying fresh water to the tank main body (51), a fresh water valve (55) which is provided to the fresh water supply line (W4), and which opens and closes in accordance with the amount of water stored in the tank main body (51), and a water supply line (W5) which supplies, to a scrubber (32), the water stored in the tank main body (51), are provided as a make-up water tank (50). Accordingly, an increase in the size of the device and an increase in costs can be inhibited by effectively using treated water.

Description

Water tank, exhaust gas treatment device, ship

The present invention relates to, for example, a water supply tank that stores water for processing exhaust gas discharged from a marine diesel engine, an exhaust gas treatment device to which the water supply tank is applied, and a ship having an exhaust gas treatment device.

Exhaust gas discharged from diesel engines contains harmful substances such as NOx, SOx, and dust. In particular, marine diesel engines using low-quality fuel also increase the amount of harmful substances contained in the exhaust gas. For this reason, marine diesel engines are required to have technologies and exhaust gas treatment devices for treating these harmful substances in order to meet various exhaust gas regulations that have become stricter in recent years.

There is exhaust gas recirculation (EGR) as a method for reducing NOx in exhaust gas. In this EGR, a part of the exhaust gas discharged from the combustion chamber of the diesel engine is mixed with the combustion air to become a combustion gas and returned to the combustion chamber. Therefore, the combustion gas has a reduced oxygen concentration, and the combustion temperature is lowered by delaying the combustion speed, which is a reaction between the fuel and oxygen, and the amount of NOx generated can be reduced.

By the way, since the exhaust gas discharged from the diesel engine contains SOx and dust that are harmful to the engine as described above, harmful substances such as SOx and dust are removed by the scrubber through the EGR valve. After that, it is mixed with the combustion air sucked from the atmosphere and then returned to the diesel engine. At this time, the scrubber removes harmful substances by performing water injection on the exhaust gas. This scrubber is effective not only as a recirculation gas but also as an apparatus for removing SOx and soot of exhaust gas discharged from a chimney.

In addition, as an exhaust gas recirculation system, there exists a thing described in the following patent document 1, for example. Moreover, as a drain water processing apparatus which processes the generated drain water, there exists a thing described in patent document 2, for example.

JP 2012-127205 A JP 04-139302 A

In the conventional exhaust gas treatment apparatus described above, the scrubber provided in the exhaust gas recirculation line removes harmful substances by performing water injection on the exhaust gas. In this case, the water sprayed to remove harmful substances is collected and reprocessed by passing through a separator, and then used again for removing harmful substances. On the other hand, since the exhaust gas is high temperature, water vapor is generated by water injection, and this water vapor is carried away by the exhaust gas. Therefore, the water used for the removal of harmful substances is treated with water by a separator or evaporated by high temperature exhaust gas. Gradually decreases. Therefore, conventionally, the fresh water stored in the fresh water tank is supplied to the scrubber. This fresh water is produced by a fresh water generator mounted on a ship. If the amount of makeup water supplied to the scrubber is increased, the fresh water generator is increased in size and the burden on the ship equipment is increased.

This invention solves the subject mentioned above, and it aims at providing the water supply tank, waste gas treatment apparatus, and ship which can suppress the enlargement and cost increase of an apparatus by using a treated water effectively. .

In order to achieve the above object, a water supply tank of the present invention includes a tank body, a drain water supply pipe for supplying condensed water generated by cooling combustion gas supplied to the engine to the tank body, and fresh water. A fresh water supply pipe that supplies the tank main body, a fresh water valve that is provided in the fresh water supply pipe and opens and closes according to the amount of water stored in the tank main body, a water supply pipe that supplies the water stored in the tank main body to the scrubber, It is characterized by providing.

Therefore, the tank main body supplies the condensed water generated by cooling the combustion gas from the drain water supply pipe and the fresh water from the fresh water supply pipe, while supplying the stored water from the water supply pipe to the scrubber. Therefore, by using the condensed water of the combustion gas as the water injected into the exhaust gas by the scrubber, the amount of fresh water used can be reduced, and the use of treated water can effectively suppress the increase in size and cost of the device. it can.

In the water supply tank of the present invention, the tank body is provided with a drain pipe for draining when the amount of stored water exceeds a preset upper limit value.

Therefore, if the amount of water stored in the tank body exceeds the upper limit value, it is drained from the drain pipe, so that the tank body does not store more water than necessary, and can be maintained at an appropriate amount of water.

In the water supply tank of the present invention, the tank body is provided with a first measurement sensor for measuring the amount of stored water.

Therefore, the first measurement sensor measures the amount of water stored in the tank body, and the fresh water valve opens and closes in accordance with the amount of stored water. Therefore, when the amount of water stored in the tank body decreases, the fresh water can be replenished. Can be maintained at an appropriate amount.

In addition, the exhaust gas treatment apparatus of the present invention provides an exhaust gas recirculation line for recirculating a part of the exhaust gas discharged from the engine as a part of combustion gas to the engine, and an exhaust gas flowing through the exhaust gas recirculation line. A scrubber that removes harmful substances by jetting water, a cooler that cools the combustion gas that is a mixture of air and recirculation gas, and condensate that is generated by cooling the combustion gas using the cooler And the water supply tank for supplying stored water to the scrubber.

Therefore, when a part of the exhaust gas discharged from the engine passes through the exhaust gas recirculation line, water is injected into the exhaust gas flowing through the exhaust gas recirculation line by the scrubber, thereby removing harmful substances and supercharging. After being mixed with air in the machine to become a combustion gas, the combustion gas is cooled by a cooler. At this time, the condensed water generated by cooling the combustion gas with the cooler is stored in the water supply tank and supplied to the scrubber as water to be injected into the exhaust gas. Therefore, the required amount of fresh water or the like supplied as water to be injected into the exhaust gas to the scrubber is reduced, and the size and cost of the apparatus can be suppressed by effectively using the treated water.

In the exhaust gas treatment apparatus of the present invention, a water supply valve provided in the water supply pipe, a water storage part that stores water injected into the exhaust gas, a second measurement sensor that measures the amount of water stored in the water storage part, and the first A control device is provided that opens the water supply valve when the amount of water stored in the water storage unit measured by the two measurement sensors is less than a preset lower limit value.

Therefore, the second measurement sensor measures the amount of water stored in the water storage unit, and when the amount of water stored in this water storage unit becomes less than the lower limit value, the water supply valve is opened, so that the amount of water stored in the water storage unit in the scrubber is constantly An appropriate amount can be maintained.

In the exhaust gas treatment apparatus of the present invention, a circulating water path for circulating the water stored in the tank body is provided, and the water supply pipe has a base end connected to the circulating water path and a tip connected to the scrubber, The water supply valve can switch a supply destination of the stored water in the tank main body between the circulating water path and the water supply pipe, and the control device can store water in the water storage section measured by the second measurement sensor. When the amount becomes smaller than a lower limit value, the supply destination of the stored water in the tank main body is switched from the circulating water path to the water supply pipe by the water supply valve.

Therefore, when the amount of water stored in the water storage section is sufficient, the supply destination of the stored water in the tank body is switched to the circulating water path by the water supply valve, and the water in the water storage section is not supplied to the scrubber, It is circulating. And when the amount of water storage of a water storage part becomes less than a lower limit, the water supply part supplies the water of a water storage part to a scrubber by switching the supply destination of the stored water of a tank main body to a water supply pipe. Therefore, when the amount of water stored in the water storage unit decreases, the water circulating in the circulating water path can be immediately supplied to the scrubber, and the amount of water stored in the water storage unit can be recovered early.

In the exhaust gas treatment apparatus of the present invention, a throttling portion is provided on the downstream side of the connection portion with the water supply pipe in the circulating water path, and branches from the upstream side of the connection portion with the water supply pipe in the circulation water path. A cleaning water path for supplying water to the exhaust gas introduction part of the scrubber is provided.

Therefore, when the amount of water stored in the water storage section is sufficient, the water in the tank body is not supplied to the scrubber but circulates in the circulating water path, and part of the water is supplied to the exhaust gas introduction section of the scrubber through the washing water path. Thus, the exhaust gas introduction part can be cleaned. At this time, by providing the throttle part in the circulating water path, the throttle part becomes a resistance, and an appropriate amount of water can flow into the washing water path. And when the amount of water stored in the water storage unit becomes less than the lower limit, the water in the tank body is supplied to the scrubber by the water supply pipe, but the pressure loss of the water supply pipe and the resistance of the throttle part are set similarly. Also at this time, an appropriate amount of water can be passed through the washing water path.

Further, the ship of the present invention includes the exhaust gas treatment device.

Therefore, it is possible to suppress the increase in size and cost of the apparatus by effectively using the treated water.

According to the water supply tank, the exhaust gas treatment apparatus, and the ship of the present invention, a drain water supply pipe that supplies condensed water generated by cooling the combustion gas to the tank body, a fresh water supply pipe that supplies fresh water, and stored water Is connected to the water supply pipe that supplies the gas to the scrubber, so that the condensate of the combustion gas can be used as the water to be injected into the exhaust gas by the scrubber, the amount of fresh water used is reduced, and the treated water is used effectively. Increase in size and cost can be suppressed.

FIG. 1 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus according to the first embodiment. FIG. 2 is a flowchart showing a flow of processing of water supply control in the water storage unit. FIG. 3 is a flowchart showing a flow of water supply control processing in the makeup water tank. FIG. 4 is a schematic diagram for explaining water supply control for the water storage section. FIG. 5 is a schematic diagram for explaining the water supply control for the makeup water tank. FIG. 6 is a schematic configuration diagram illustrating the exhaust gas treatment apparatus of the second embodiment. FIG. 7 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus of the third embodiment.

Hereinafter, preferred embodiments of a water supply tank, an exhaust gas treatment device, and a ship according to the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

[First Embodiment]
FIG. 1 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus according to the first embodiment.

In the exhaust gas treatment apparatus of the first embodiment, after a part of exhaust gas discharged from a marine diesel engine is mixed with air, it is compressed by a supercharger and is a combustion gas (mixed gas of exhaust gas and air or air). When recirculating to marine diesel engines, harmful substances are removed from the recirculated exhaust gas.

In the exhaust gas treatment apparatus of the first embodiment, as shown in FIG. 1, a marine diesel engine 11 is a propulsion engine (main engine) that drives and rotates a propeller for propulsion via a propeller shaft, although not shown. This marine diesel engine 11 is a uniflow scavenging exhaust type diesel engine, which is a two-stroke diesel engine, in which the flow of intake and exhaust in the cylinder is unidirectional from the bottom to the top so as to eliminate residual exhaust. Is. The marine diesel engine 11 includes a cylinder (combustion chamber) 12 in which a piston moves up and down, a scavenging chamber 13 that communicates with the cylinder 12, and an exhaust port 14 that communicates with the cylinder 12 and is provided with an exhaust valve. In the marine diesel engine 11, the air supply line G 1 is connected to the scavenging chamber 13, and the exhaust line G 2 is connected to the exhaust port 14.

The supercharger 21 is configured by connecting a compressor 22 and a turbine 23 so as to rotate integrally with a rotary shaft 24. In the supercharger 21, the turbine 23 is rotated by the exhaust gas discharged from the exhaust line G2 of the marine diesel engine 11, the rotation of the turbine 23 is transmitted by the rotating shaft 24, the compressor 22 is rotated, And / or the recirculated gas is compressed and supplied to the marine diesel engine 11 from the supply line G1.

The turbocharger 21 is connected to an exhaust line G3 that discharges exhaust gas that has rotated the turbine 23. The exhaust line G3 is connected to a chimney (funnel) (not shown). Further, the exhaust line G3 is provided with an exhaust gas recirculation line G4 branched from the middle. The exhaust gas recirculation line G4 is provided with an EGR valve (flow control valve) 31 and is connected to a scrubber 32. The EGR valve 31 adjusts the flow rate of exhaust gas that passes through the exhaust gas recirculation line G4, and adjusts the amount of exhaust gas that is diverted from the exhaust line G3 to the exhaust gas recirculation line G4. The scrubber 32 removes harmful substances such as SOx and dust contained by injecting water to the exhaust gas. In this embodiment, a venturi type scrubber is adopted, but it is not limited to this configuration.

The scrubber 32 includes a hollow main body 33, a venturi section 34 into which exhaust gas is introduced, and a water storage section 35 for storing drainage. The scrubber 32 has a water injection unit 36 that injects water to the exhaust gas introduced into the venturi unit 34, and a drain circulation line W 1 that circulates the drainage of the water storage unit 35 to the water injection unit 36 is provided. The drainage circulation line W1 is provided with a pump 37. The scrubber 32 is provided with a gas discharge part 38 for discharging the exhaust gas from which harmful substances have been removed, and is connected to a gas discharge line G5. The gas discharge line G5 is provided with a mist separator (mist eliminator) 39 and a blower (blower) 40, and is connected to a mixer (mixer) 41.

The blower 40 discharges the exhaust gas in the scrubber 32 from the gas discharge unit 38 to the gas discharge line G5. The mist separator 39 separates droplets of small-diameter particles contained in the exhaust gas from which harmful substances have been removed by water jet, and the separated separated water is returned to the water storage unit 35 of the scrubber 32 by the separated water line W2. It is. The mixer (mixer) 41 mixes the air sucked from outside air and the exhaust gas (recirculation gas) from the gas discharge line G 5 to generate combustion gas, and this combustion gas is supplied to the supercharger 21. A combustion air supply line G6 for supplying to the compressor 22 is provided. The supercharger 21 can supply the combustion gas compressed by the compressor 22 from the supply line G1 to the marine diesel engine 11, and an air cooler (cooler) 42 is provided in the supply line G1. The air cooler 42 cools the combustion gas by exchanging heat between the combustion gas compressed by the compressor 22 and having a high temperature and the cooling water.

When the air cooler 42 cools the high-temperature combustion gas, the temperature and pressure of the combustion gas are reduced, so that the water vapor contained in the combustion gas is condensed to generate condensed water (drain water). The air cooler 42 is provided with a drain water discharge line W 3 for discharging the generated drain water, and the drain water discharge line W 3 is connected to a makeup water tank (water supply tank) 50.

The makeup water tank 50 includes a tank body 51, a drain water discharge line (drain water supply pipe) W3, a fresh water supply line (fresh water supply pipe) W4, a water supply line (water supply pipe) W5, and an overflow line (drain pipe). ) W6.

The tank body 51 has a hollow shape and can store a predetermined amount of water (drain water and fresh water). The tank body 51 is connected to a pipe constituting a drain water discharge line W3 at the upper portion, and drain water generated by the air cooler 42 is supplied through the drain water discharge line W3. Moreover, the tank main body 51 is connected to a pipe constituting the fresh water supply line W4 on the side, and fresh water is supplied through the fresh water supply line W4. The ship is equipped with a fresh water generator 52 for producing fresh water, and a fresh water tank 53 for storing fresh water produced by the fresh water generator 52 is connected to the ship. And the fresh water tank 53 is connected with the tank main body 51 by the fresh water supply line W4, and the fresh water pump 54 and the fresh water valve 55 are provided in the fresh water supply line W4.

The tank body 51 is connected to a pipe constituting the overflow line W6 on the side, and when the amount of water stored in the tank body 51 exceeds a preset upper limit value, the stored water is discharged through the overflow line W6. The drain water treatment line W7 is provided with a drain water tank 56 and a pump 57, and is connected to a treatment device 58. The treatment device 58 removes oil such as lubricating oil and system oil of the marine diesel engine 11 from the drain water, the treated water is drained as it is, and the separated waste is stored in a waste container (not shown).

The tank main body 51 is connected to a pipe constituting a water supply line W5 at the lower part. The water supply line W5 is connected to the scrubber 32, and the water stored in the tank main body 51 is supplied to the scrubber 32 through the water supply line W5. . The water supply line W5 is provided with a water supply pump 59 and a water supply valve 60. The water supply pump 59 is provided on the tank body 51 side in the water supply line W5, and the water supply valve 60 is connected to the scrubber 32 side, that is, from the water supply pump 59. It is provided on the downstream side.

The controller 61 can open and close the EGR valve 31, the fresh water valve 55, and the water supply valve 60, and can drive and control the pump 37, blower 40, fresh water pump 54, pump 57, and water supply pump 59. The control device 61 controls the opening and closing of the EGR valve 31 according to the operation state (operation area) of the ship. That is, the control device 61 closes the EGR valve 31 without outputting an EGR operation signal if the current operation area of the ship is outside the NOx restriction area that restricts the NOx emission amount. On the other hand, the control device 61 outputs an EGR operation signal and opens the EGR valve 31 if the current operating area of the ship is within the NOx restricted area where NOx emission is restricted. As will be described later, the EGR operation signal may be output when the crew member determines the NOx restriction sea area and operates the EGR operation switch, or the control device 61 determines and outputs the NOx restriction sea area. Good.

Then, the control device 61 operates the scrubber 32 when the current operating area of the ship is in the NOx restricted area and the EGR valve 31 is opened by the EGR operation signal. That is, the control device 61 opens the EGR valve 31 and drives the pump 37 and the blower 40. Therefore, when the exhaust gas in the exhaust line G3 flows into the exhaust gas recirculation line G4, the scrubber 32 can remove harmful substances such as SOx and dust contained by injecting water to the exhaust gas.

Further, the control device 61 controls the opening and closing of the water supply valve 60 while controlling the drive of the water supply pump 59 according to the amount of water stored in the water storage section 35 of the scrubber 32. That is, since the scrubber 32 removes harmful substances by performing water injection on the exhaust gas, a part of the injection water becomes steam due to the high-temperature exhaust gas and is carried away by the exhaust gas. Further, although not shown, the scrubber 32 cleans the drainage of the water storage unit 35 with a filter, so that part of the drainage is carried away together with the waste. Therefore, the scrubber 32 needs to periodically replenish water stored in the water storage unit 35 in order to inject the exhaust gas.

The scrubber 32 is provided with a water amount sensor (second measurement sensor) 62 that measures the amount of water stored in the water storage unit 35. The control device 61 drives the water supply pump 59 and opens the water supply valve 60 when the water storage amount of the water storage unit 35 measured by the water amount sensor 62 is less than a preset lower limit value, thereby opening the makeup water tank 50. Is supplied to the water storage unit 35 of the scrubber 32 through the water supply line W5. On the other hand, when the water storage amount of the water storage unit 35 measured by the water amount sensor 62 exceeds the preset upper limit value, the control device 61 stops driving the water supply pump 59 and closes the water supply valve 60 to make up the makeup. Water supply from the upwater tank 50 to the water storage unit 35 through the water supply line W5 is stopped.

Further, the control device 61 controls driving of the fresh water pump 54 and opening / closing of the fresh water valve 55 according to the amount of water stored in the tank body 51 of the makeup water tank 50. That is, the air cooler 42 generates drain water by cooling the combustion gas, and supplies this drain water to the makeup water tank 50 from the drain water discharge line W3. However, since the marine diesel engine 11 varies in the amount of exhaust gas depending on the operating state (for example, output), the amount of drain water generated also varies. Further, as described above, the scrubber 32 supplies the water stored in the makeup water tank 50 to the water storage unit 35 from the water supply line W5 when the water storage amount of the water storage unit 35 decreases. Decrease. Therefore, make-up water tank 50 needs to replenish water stored in tank body 51 periodically.

The makeup water tank 50 is provided with a water amount sensor (first measurement sensor) 63 that measures the amount of water stored in the tank body 51. When the water storage amount of the tank main body 51 measured by the water amount sensor 63 is less than a preset lower limit value, the control device 61 drives the fresh water pump 54 and opens the fresh water valve 55 to store the fresh water tank 53. Water is supplied to the tank body 51 of the makeup water tank 50 through the fresh water supply line W4. On the other hand, the controller 61 stops the driving of the fresh water pump 54 and closes the fresh water valve 55 when the amount of water stored in the tank main body 51 measured by the water amount sensor 63 exceeds the preset upper limit value. Supply of fresh water from the tank 53 to the tank body 51 through the fresh water supply line W4 is stopped.

Here, the operation of the exhaust gas treatment apparatus of the first embodiment will be described. 2 is a flowchart showing a flow of water supply control processing in the water storage unit, FIG. 3 is a flowchart showing a flow of water supply control processing in the makeup water tank, and FIG. 4 is a diagram for explaining water supply control for the water storage unit FIG. 5 is a schematic diagram for explaining water supply control for the makeup water tank.

In the exhaust gas treatment apparatus of the first embodiment, when marine diesel engine 11 is supplied with combustion air from scavenging chamber 13 into cylinder 12, the combustion air is compressed by a piston, When fuel is injected, it ignites spontaneously and burns. The generated combustion gas is discharged from the exhaust port 14 to the exhaust line G2 as exhaust gas. The exhaust gas discharged from the marine diesel engine 11 is discharged to the exhaust line G3 after rotating the turbine 23 in the supercharger 21, and when the EGR valve 31 is closed, the entire amount is discharged to the outside from the exhaust line G3. Is done.

On the other hand, when the EGR valve 31 is open, a part of the exhaust gas flows from the exhaust line G3 to the exhaust gas recirculation line G4. The scrubber 32 removes harmful substances such as NOx and soot contained in the exhaust gas flowing into the exhaust gas recirculation line G4. That is, when the exhaust gas passes through the venturi part 34, the scrubber 32 injects water from the water injection part 36 to cool the exhaust gas with this water and to drop particulates (PM) such as SOx and dust with water. To remove. And the water containing SOx, dust, etc. is stored in the water storage part 35, and is returned to the water injection part 36 again by the pump 37 through the drainage circulation line W1.

The exhaust gas from which harmful substances have been removed by the scrubber 32 is discharged from the gas discharge part 38 to the gas discharge line G5, and after the droplets of small diameter particles are separated by the mist separator 39, the exhaust gas is mixed with the air sucked by the mixer 41 And becomes a combustion gas. The combustion gas passes through the combustion air supply line G6, is compressed by the compressor 22 of the supercharger 21, is cooled by the air cooler 42, and is supplied from the supply air line G1 to the marine diesel engine 11.

The air cooler 42 cools the high-temperature combustion gas, whereby water vapor in the combustion gas is condensed to generate drain water, and this drain water is discharged to the drain water discharge line W3. The drain water is supplied to the makeup water tank 50 through the drain water discharge line W3 and stored therein.

The control device 61 controls the water supply pump 59 and the water supply valve 60 according to the amount of water stored in the water storage unit 35 in the scrubber 32. Here, the control of the water storage amount in the scrubber 32 by the control device 61 will be described in detail using a flowchart.

As shown in FIGS. 1 and 2, in step S11, it is determined whether or not the ship is navigating the NOx restricted area. If it is determined that the ship is navigating the NOx-regulated sea area (Yes), the EGR valve 31 is opened in step S12, and the scrubber 32 is operated in step S13. On the other hand, if it is determined (No) that the ship is not navigating the NOx-regulated sea area, the EGR valve 31 is closed in step S19, and the scrubber 32 is stopped in step S20.

In this case, whether or not the ship is navigating the NOx restricted area is determined by the crew, and when the ship enters the NOx restricted area, the crew operates (ON) the EGR operation switch. The device 61 receives the EGR operation signal and opens the EGR valve 31. On the other hand, when the ship leaves the NOx restricted sea area, the crew operates the EGR operation switch (OFF), so that the control device 61 closes the EGR valve 31 in response to the stop of the EGR operation signal. The control device 61 may open and close the EGR valve 31 by determining the navigation state of the ship in the NOx restricted sea area.

In step S14, it is determined whether or not the water amount of the water storage unit 35 in the scrubber 32 measured by the water amount sensor 62 is at a predetermined water level (more than a lower limit value). Here, if it is determined (Yes) that the amount of water stored in the water storage unit 35 in the scrubber 32 is at a predetermined water level (above the lower limit value), the water supply valve 60 is closed in step S15, and the water supply pump 59 in step S16. To stop. On the other hand, if it is determined (No) that the amount of water stored in the water storage unit 35 in the scrubber 32 is not at the predetermined water level (less than the lower limit value), the water supply valve 60 is opened in step S17, and the water supply pump 59 is determined in step S18. Drive.

Then, by opening the water supply valve 60 and driving the water supply pump 59 in the water supply line W5, the water stored in the tank body 51 in the makeup water tank 50 is supplied to the water storage part 35 of the scrubber 32 through the water supply line W5. The Therefore, the amount of water stored in the water storage unit 35 increases.

Thereafter, when it is determined in step S14 that the amount of water stored in the water storage unit 35 has increased and is at the predetermined water level (Yes), the water supply valve 60 is closed in step S15, and the water supply pump 59 is turned on in step S16. Stop. Therefore, water supply from the makeup water tank 50 to the water storage unit 35 through the water supply line W5 is stopped. If it is determined in step S11 that the ship has deviated from the NOx restricted sea area (No), the EGR valve 31 is closed in step S19, and the scrubber 32 is stopped in step S20.

In the flowchart of FIG. 2, the control of the EGR valve 31 and the control of the water supply valve 60 and the water supply pump 59 are collectively described, but actually, they are processed separately. That is, in step S11, it is determined that the ship is navigating the NOx-regulated sea area, and if the processing after step S12 is entered, after returning, the processing returns to step S14 and the processing of steps S14 to S18 is repeated. On the other hand, when the ship leaves the NOx restricted sea area in step S11, the process proceeds to step S19.

Further, the control device 61 controls the fresh water pump 54 and the fresh water valve 55 according to the amount of water stored in the tank body 51 in the makeup water tank 50. Here, the control of the water storage amount in the makeup water tank 50 by the control device 61 will be described in detail using a flowchart.

As shown in FIGS. 1 and 3, in step S21, it is determined whether or not the amount of water in the tank body 51 in the makeup water tank 50 measured by the water amount sensor 63 is at a predetermined level (greater than or equal to the lower limit value). Here, when it is determined (Yes) that the amount of water stored in the tank body 51 in the makeup water tank 50 is at a predetermined water level (lower limit value or more), in step S22, the fresh water valve 55 is closed, and in step S23, The fresh water pump 54 is stopped. On the other hand, if it is determined (No) that the amount of water stored in the tank body 51 in the makeup water tank 50 is not at the predetermined water level (less than the lower limit value), the fresh water valve 55 is opened in step S24, and in step S25. The fresh water pump 54 is driven.

Then, the fresh water valve 55 is opened in the fresh water supply line W4 and the fresh water pump 54 is driven, whereby the fresh water in the fresh water tank 53 is supplied to the tank body 51 in the makeup water tank 50 through the fresh water supply line W4. Therefore, the amount of water stored in the tank body 51 increases. Thereafter, if it is determined in step S21 that the amount of water stored in the tank body 51 is increased and is at a predetermined water level (Yes), the fresh water valve 55 is closed in step S22, and the fresh water pump 54 is turned on in step S23. Stop. Therefore, the supply of fresh water from the fresh water tank 53 to the tank body 51 through the fresh water supply line W4 is stopped.

In each of the water supply controls described above, the upper limit value and the lower limit value for the water storage amount of the water storage unit 35 and the tank body 51 are set, and the control device 61 uses the water storage unit 35 and the tank measured by the

water amount sensors

62 and 63. When the amount of water stored in the main body 51 exceeds the upper limit value, the

valves

60 and 55 are closed, and the operations of the

pumps

59 and 54 are stopped.

For example, as shown in FIG. 4, an upper limit value H1 and a lower limit value L1 are set for the water level of the water storage section 35. Here, the initial water level of the water storage unit 35 is between the lower limit value L1 and the upper limit value H1, and at this time, the water supply valve 60 is closed and the water supply pump 59 is stopped. Water supply has stopped. When water level is lowered to the lower limit value L1 by removing moisture from the recirculation gas, when the water level falls below the lower limit value L1, the water supply valve 60 is opened and the water supply pump 59 is driven. Then, water supply from the tank body 51 to the water storage unit 35 is started. And when the water level of the water storage part 35 rises and reaches the upper limit H1, the water supply valve 60 is closed and the water supply pump 59 is stopped, whereby the water supply from the tank body 51 to the water storage part 35 is stopped.

Further, as shown in FIG. 5, an upper limit value H2 and a lower limit value L2 are set for the water level of the tank body 51. Here, the initial water level of the tank body 51 is between the lower limit value L2 and the upper limit value H2. At this time, the fresh water valve 55 is closed and the fresh water pump 54 is stopped. Water supply has stopped. Although drain water is supplied to the tank main body 51, when the water level supplied to the water storage unit 35 increases and the water level of the tank main body 51 falls to the lower limit L2, when the water level falls below the lower limit L2, Supply of fresh water from the fresh water tank 53 to the tank body 51 is started by opening the fresh water valve 55 and driving the fresh water pump 54. Then, when the water level of the tank main body 51 rises and reaches the upper limit value H2, the supply of fresh water from the fresh water tank 53 to the tank main body 51 is stopped by closing the fresh water valve 55 and stopping the fresh water pump 54. To do.

Further, the upper limit value H2 of the water level in the tank body 51 is set to a value slightly lower than the overflow value H0. Therefore, when supplying fresh water from the fresh water tank 53 to the tank body 51, the supply of fresh water is stopped when the water level of the tank body 51 reaches the upper limit H2 just before reaching the overflow value H0. And if the amount of drain water supplied to the tank main body 51 becomes larger than the amount of water supplied to the water storage part 35, the water level of the tank main body 51 will exceed the lower limit L2. Here, when the water level of the tank body 51 exceeds the overflow value H0, the excess water amount is discharged to the overflow line W6. Since the water overflowed from the tank main body 51 contains oil, it flows into the drain water treatment line W7 and accumulates in the drain water tank 56, and the treatment device 58 purifies the drain water.

As described above, in the water supply tank of the first embodiment, the makeup water tank 50 is the tank body 51 and a drain water discharge line for supplying the tank body 51 with condensed water generated by cooling the combustion gas. W3, a fresh water supply line W4 that supplies fresh water to the tank body 51, a fresh water valve 55 that is provided in the fresh water supply line W4 and opens and closes according to the amount of water stored in the tank body 51, and the stored water in the tank body 51 is scrubber 32. A water supply line W5 is provided.

Accordingly, the tank main body 51 is supplied with drain water generated by cooling the exhaust gas from the drain water discharge line W3 and fresh water is supplied from the fresh water supply line W4, while the stored water is supplied from the water supply line W5 to the scrubber 32. Supply to the water reservoir 35. Therefore, by using the drain water of the combustion gas as the water injected into the exhaust gas by the scrubber 32, the amount of fresh water used is reduced, and the use of treated water is effectively suppressed, thereby suppressing the increase in size and cost of the apparatus. Can do.

In the water supply tank of the first embodiment, the tank body 51 is provided with an overflow line W6 that drains when the amount of stored water exceeds a preset overflow value. Therefore, if the amount of water stored in the tank main body 51 exceeds the overflow value, the tank main body 51 does not store more water than necessary, and can be maintained at an appropriate amount of water storage by draining from the overflow line W6.

In the water supply tank of the first embodiment, the tank body 51 is provided with a water amount sensor 62 for measuring the amount of water stored. Accordingly, the water amount sensor 62 measures the amount of water stored in the tank main body 51, and the fresh water valve 55 opens and closes in accordance with the amount of stored water. Therefore, when the amount of water stored in the tank main body 51 decreases, the fresh water can be replenished. The amount of stored water can be maintained at an appropriate level.

Further, in the exhaust gas treatment apparatus of the first embodiment, a part of the exhaust gas discharged from the marine diesel engine 11 is mixed with air and compressed by the supercharger 21 as a combustion gas to the marine diesel engine 11. The exhaust gas recirculation line G4 that recirculates, the scrubber 32 that removes harmful substances by injecting water into the exhaust gas flowing through the exhaust gas recirculation line G4, and the compressor 22 compresses the harmful substances after they are removed by the scrubber 32 An air cooler 42 that cools the combustion gas generated, and a makeup water tank 50 that stores drain water generated by cooling the combustion gas by the air cooler 42 and supplies the stored water to the scrubber 32 are provided.

Therefore, a part of the exhaust gas discharged from the marine diesel engine 11 passes through the exhaust gas recirculation line G4, is compressed by the supercharger 21, and is recirculated to the marine diesel engine 11 as combustion gas. The scrubber 32 removes harmful substances by injecting water to the exhaust gas flowing through the exhaust gas recirculation line G4. The air cooler 42 cools the combustion gas compressed by the compressor 22 after the harmful substances are removed. At this time, since the air cooler 42 cools the combustion gas and drain water is generated, the drain water is supplied to the scrubber 32 through the water supply line W5. Therefore, the scrubber 32 can reduce the water shortage by supplying drain water, and can suppress the increase in size and cost of the apparatus by effectively using the treated water.

[Second Embodiment]
FIG. 6 is a schematic configuration diagram illustrating the exhaust gas treatment apparatus of the second embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

As shown in FIG. 6, the exhaust gas treatment apparatus of the second embodiment circulates the exhaust gas recirculation line G4, the scrubber 32, the air cooler 42, the makeup water tank 50, and the stored water in the makeup water tank 50. A circulating water line W11 is provided, and the control device 61 switches the supply destination of the stored water from the circulating water line W11 to the water supply line W5 when the amount of water stored in the scrubber 32 is less than the lower limit value.

The makeup water tank 50 includes a tank body 51, a drain water discharge line W3, a fresh water supply line W4, a circulating water line (circulating water path) W11, a water supply line W5, and an overflow line W6.

The circulating water line W11 has a base end connected to the lower part of the tank main body 51 and a tip end connected to the side of the tank main body 51. The water supply line W5 has a proximal end portion connected to the circulating water line W11 and a distal end portion connected to the water storage portion 35 of the scrubber 32. The feed water pump 59 is provided on the upstream side of the connection portion with the feed water line W5 in the circulating water line W11. The water supply valve 60 is provided in the water supply line W5. Moreover, the circulation valve 71 is provided in the downstream from the connection part with the water supply line W5 in the circulation water line W11.

Here, the water supply valve 60 and the circulation valve 71 can switch the supply destination of the stored water in the tank body 51 between the circulation water line W11 and the water supply line W5. That is, when the water supply valve 60 is closed and the circulation valve 71 is opened, the water stored in the tank main body 51 can flow into the circulation water line W11. On the other hand, when the water supply valve 60 is opened and the circulation valve 71 is closed, the water stored in the tank main body 51 can flow into the water supply line W5.

The control device 61 closes the EGR valve 31 without outputting an EGR operation signal if the current operation area of the ship is outside the NOx restriction area where the NOx emission amount is restricted. On the other hand, the control device 61 outputs an EGR operation signal and opens the EGR valve 31 if the current operating area of the ship is within the NOx restricted area where NOx emission is restricted. And the control apparatus 61 will operate the scrubber 32, if the operation area of the present ship is in a NOx control area and the EGR valve 31 is opened by an EGR operation signal. That is, the control device 61 opens the EGR valve 31 and drives the pump 37 and the blower 40. Therefore, when the exhaust gas in the exhaust line G3 flows into the exhaust gas recirculation line G4, the scrubber 32 can remove harmful substances such as SOx and dust contained by injecting water to the exhaust gas.

Further, when the scrubber 32 is operated, the control device 61 drives the water supply pump 59 to close the water supply valve 60 and open the circulation valve 71. Then, the water stored in the tank body 51 is circulated through the circulating water line W11 by the water supply pump 59. And the control apparatus 61 controls opening and closing of the water supply valve 60 and the circulation valve 71 according to the water storage amount in the water storage part 35 of the scrubber 32.

That is, the control device 61 closes the circulation valve 71 and opens the water supply valve 60 when the amount of water stored in the water storage unit 35 measured by the water amount sensor 62 is less than a preset lower limit value, thereby opening the makeup water. The water stored in the tank 50 is supplied to the water storage unit 35 of the scrubber 32 through the water supply line W5. On the other hand, the controller 61 opens the circulation valve 71 and closes the water supply valve 60 when the amount of water stored in the water storage unit 35 measured by the water amount sensor 62 exceeds a preset reference value (upper limit value). Then, water supply from the makeup water tank 50 to the water storage unit 35 through the water supply line W5 is stopped.

Thus, in the exhaust gas treatment apparatus of the second embodiment, the circulating water line W11 that circulates the stored water in the tank main body 51 is provided, the proximal end portion of the water supply line W5 is connected to the circulating water line W11, and the distal end portion. Is connected to the water storage unit 35 of the scrubber 32, the circulation valve 71 of the circulation water line W11 is provided, the water supply valve 60 is provided to the water supply line W5, and the controller 61 reduces the amount of water stored in the water storage unit 35 below the lower limit value. In this case, the circulation valve 71 is closed and the water supply valve 60 is opened, so that the supply destination of the stored water in the tank body 51 is switched from the circulation water line W11 to the water supply line W5.

Therefore, when the amount of water stored in the water storage unit 35 is sufficient, the circulation valve 71 is opened and the water supply valve 60 is closed, so that the storage water supply destination of the tank body 51 is the circulation water line W11. When the amount of stored water decreases, the circulation valve 71 is closed and the water supply valve 60 is opened, so that the water supply destination of the tank body 51 is the water supply line W5. Therefore, when the amount of water stored in the water storage unit 35 decreases, the water circulating through the circulating water line W11 can be immediately supplied to the scrubber 32, and the amount of water stored in the water storage unit 35 can be recovered early. That is, in order to send the water stored in the tank main body 51 from the water supply line W5 to the water storage unit 35, the water supply pump 59 is required, and it takes a predetermined time until the water supply pump 59 is raised from the stopped state to a predetermined discharge pressure. Is required. In the present embodiment, by constantly driving the water supply pump 59 to circulate water to the circulating water line W11, when the amount of water stored in the water storage unit 35 is reduced, the circulating water in the circulating water line W11 is quickly discharged. It can be supplied to the scrubber 32 from the water supply line W5, and the water supply delay can be eliminated.

[Third Embodiment]
FIG. 7 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus of the third embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

In the exhaust gas treatment apparatus of the third embodiment, as shown in FIG. 7, the exhaust gas recirculation line G4, the scrubber 32, the air cooler 42, the makeup water tank 50, and the stored water in the makeup water tank 50 are circulated. A circulating water line W11 and a washing water line (washing water path) W12 that branches from the circulating water line W11 and supplies water to the venturi section 34 in the scrubber 32 are provided, and the controller 61 has a water storage amount of the scrubber 32 that is lower than the lower limit value. When the amount of water is decreased, the supply destination of the stored water is switched from the circulating water line W11 to the water supply line W5.

The makeup water tank 50 includes a tank body 51, a drain water discharge line W3, a fresh water supply line W4, a circulating water line W11, a water supply line W5, and an overflow line W6.

The washing water line W12 has a proximal end portion connected to the upstream side of the connection portion with the water supply line W5 in the circulating water line W11 and a distal end portion connected to the venturi portion 34 in the scrubber 32. The washing water line W12 is provided with a flow rate adjustment valve 81 and a flow meter 82. The venturi section 34 is provided with a water injection section 83. The water injection section 83 injects water supplied from the washing water line W12, so that the water causes the wall surfaces of the venturi section 34 and the water injection section 36 to be injected. While cooling, particulates (PM) such as SOx and dust adhering to the venturi section 34 are dropped together with water and removed. Moreover, generation | occurrence | production of the precipitate resulting from circulating water can also be suppressed.

The timing for starting water injection by the water injection unit 36 is when the EGR operation is started (when the EGR valve 31 is opened), and the timing when the water injection is ended is when the EGR operation is stopped (when the EGR valve 31 is closed). ). On the other hand, the water injection unit 83 preferably starts water injection after the EGR operation is started and the internal temperature in the venturi unit 34 exceeds a predetermined temperature (for example, 80 ° C.). When the temperature drops below the predetermined temperature, it is desirable to stop water injection. Therefore, the timing at which the water injection unit 83 starts water injection is when a predetermined time has elapsed since the start of the EGR operation, and the timing at which water injection ends is when the predetermined time has elapsed since the EGR operation stopped. is there. In this case, a timer or a temperature sensor may be used.

Since the circulating water circulating through the drainage circulation line W11 is added with sodium hydroxide (NaOH), salt (en) precipitates when dried while attached. Therefore, salt precipitation can be suppressed by washing away the circulating water attached to the wall surfaces of the venturi part 34 and the first water injection part 36 with water.

Further, the circulating water line W11 is provided with an orifice (throttle portion) 72 on the downstream side of the circulation valve 71. The orifice 72 is a resistor in the circulating water line W11 and gives a pressure loss to the water flowing through the circulating water line W11. The magnitude of the pressure loss generated by the orifice 72 in the circulating water line W11 is set according to the amount of water supplied to the water injection unit 83 through the washing water line W12. That is, the water stored in the tank body 51 is circulated through the circulating water line W11 by the water supply pump 59. Here, since the washing water line W12 is connected to the circulating water line W11, if the resistance (pressure loss) of the orifice 72 is large, the amount of water flowing to the washing water line W12 increases.

That is, the control device 61 closes the circulation valve 71 and opens the water supply valve 60 when the amount of water stored in the water storage unit 35 measured by the water amount sensor 62 is less than a preset lower limit value, thereby opening the makeup water. The water stored in the tank 50 is supplied to the water storage unit 35 of the scrubber 32 through the water supply line W5. Part of the stored water flowing out from the tank main body 51 to the circulating water line W11 by the feed water pump 59 flows into the washing water line W12 through the orifice 72, and the rest is returned to the tank main body 51 through the circulating water line W11. When the circulation valve 71 is closed and the water supply valve 60 is opened, the amount of water that has been returned to the tank main body 51 by the circulation water line W11 is stored in the stored water flowing out from the tank main body 51 to the circulation water line W11 by the water supply pump 59. The amount of water supplied from the water supply line W5 to the water storage unit 35 of the scrubber 32 and supplied from the washing water line W12 to the water injection unit 83 is almost the same. That is, since the pressure loss of the circulating water line W11 and the water supply line W5 is equal, the amount of water supplied from the washing water line W12 to the water injection unit 83 regardless of which of the circulating water line W11 and the water supply line W5 is connected. Can be maintained.

Then, the control device 61 opens the circulation valve 71 and closes the water supply valve 60 when the water storage amount of the water storage unit 35 measured by the water amount sensor 62 exceeds a preset upper limit value. Water supply from the tank 50 to the water storage unit 35 through the water supply line W5 is stopped.

As described above, in the exhaust gas treatment apparatus of the third embodiment, the orifice 72 is provided on the downstream side of the connection portion with the water supply line W5 in the circulating water line W11, and the connection portion with the water supply line W5 in the circulating water line W11. A washing water line W12 that branches from the upstream side and supplies water to the venturi part 34 of the scrubber 32 is provided.

Therefore, when the amount of water stored in the water storage unit 35 is sufficient, the water stored in the tank body 51 is not supplied to the scrubber 32 but circulates in the circulating water line W11, and a part of the water is stored in the venturi of the scrubber 32 by the washing water line W12. By supplying water to the section 34, the venturi section 34 can be washed with this water. At this time, since the orifice 72 is provided in the circulating water line W11, the orifice 72 becomes a flow path resistance (pressure loss), and an amount of water corresponding to the orifice 72 can flow to the washing water line W12. Water can be allowed to flow through the washing water line W12. When the amount of water stored in the water storage unit 35 becomes less than the lower limit value, the water stored in the tank body 51 is supplied to the water storage unit 35 of the scrubber 32 through the water supply line W5. By setting the resistance (pressure loss) 72 to be the same, an appropriate amount of water can be allowed to flow through the washing water line W12 even at this time.

In the second and third embodiments described above, the water supply valve of the tank main body 51 is provided in the circulating water line W11 as a water supply valve that can be switched between the circulating water line W11 and the water supply line W5. Although the water supply valve 60 provided in the circulation valve 71 and the water supply line W5 is applied, it is not limited to this configuration. For example, you may provide a three-way valve as a water supply valve in the connection part of the circulating water line W11 and the water supply line W5.

In each of the above-described embodiments, the fresh water pump 54 and the fresh water valve 55 are provided in the fresh water supply line W4 for supplying the fresh water from the fresh water tank 53 to the tank body 51. However, the present invention is not limited to this configuration. For example, the fresh water tank 53 is arranged at a position higher than the tank main body 51 so that an altitude difference (head difference) occurs between the fresh water tank 53 and the tank main body 51, and only the fresh water valve 55 is provided in the fresh water supply line W4. May be configured.

In each of the above-described embodiments, the water main body 51 is provided with the water amount sensor 63 as the first measurement sensor for measuring the water storage amount of the tank main body 51. However, the present invention is not limited to this configuration. For example, the amount of water stored in the tank body 51 fluctuates according to the amount of drain water supplied from the air cooler 42 through the drain water discharge line W3, so that the flow rate to the drain water discharge line W3 is the first measurement sensor. A sensor may be provided. Further, the amount of drain water supplied from the air cooler 42 through the drain water discharge line W3 varies depending on the load (output, fuel supply amount, air supply amount, etc.) of the marine diesel engine 11, An engine load sensor may be provided as the first measurement sensor.

Further, the configuration of the scrubber 32 described in each embodiment described above is an example, and other configurations may be used. For example, although the scrubber 32 removes SOx and dust as harmful substances, it is not limited to this configuration. For example, the scrubber is composed of a first scrubber that removes harmful substances such as SOx and dust, and a second scrubber that removes harmful substances such as soot, and a water storage section is connected to the water storage section of each scrubber via a drainage line. You may comprise and comprise.

In the above-described embodiment, the main engine is used as the marine diesel engine. However, the marine diesel engine can be applied to a diesel engine used as a generator.

DESCRIPTION OF SYMBOLS 11 Marine diesel engine 21 Supercharger 31 EGR valve 32 Scrubber 34 Venturi part 35 Water storage part 36 Water injection part 42 Air cooler (cooler)
50 Make-up water tank (water supply tank)
51 tank body 52 water generator 53 fresh water tank 54 fresh water pump 55 fresh water valve 59 water supply pump 60 water supply valve 61 controller 62 water amount sensor (second measurement sensor)
63 Water sensor (first measurement sensor)
71 Circulating valve 72 Orifice (throttle part)
81 Flow control valve 83 Water injection part G4 Exhaust gas recirculation line W3 Drain water discharge line (drain water supply pipe)
W4 fresh water supply line (fresh water supply pipe)
W5 water supply line (water supply pipe)
W6 Overflow line (drain pipe)
W11 Circulating water line W12 Washing water line

Claims

The tank body,
A drain water supply pipe for supplying condensed water generated by cooling the combustion gas supplied to the engine to the tank body;
A fresh water supply pipe for supplying fresh water to the tank body;
A fresh water valve provided in the fresh water supply pipe and opened and closed according to the amount of water stored in the tank body;
A water supply pipe for supplying the water stored in the tank body to the scrubber;
A water supply tank comprising:
The water tank according to claim 1, wherein the tank body is provided with a drain pipe for draining water when the amount of stored water exceeds a preset upper limit value.
The water tank according to claim 1 or 2, wherein the tank body is provided with a first measurement sensor for measuring a water storage amount.
An exhaust gas recirculation line for recirculating a part of the exhaust gas discharged from the engine to the engine as a part of the combustion gas;
A scrubber that removes harmful substances by injecting water into the exhaust gas flowing through the exhaust gas recirculation line;
A cooler for cooling the combustion gas mixed with air and recirculation gas;
The water supply tank according to any one of claims 1 to 3, wherein condensed water generated by cooling the combustion gas by the cooler is stored and the stored water is supplied to the scrubber.
An exhaust gas treatment apparatus comprising:
A water supply valve provided in the water supply pipe, a water storage part for storing water injected into the exhaust gas, a second measurement sensor for measuring the amount of water stored in the water storage part, and the water storage measured by the second measurement sensor The exhaust gas processing apparatus according to claim 4, further comprising: a control device that opens the water supply valve when the amount of water stored in the section becomes less than a preset lower limit value.
A circulating water path for circulating the water stored in the tank body is provided, and the water supply pipe has a proximal end connected to the circulating water path, a distal end connected to the scrubber, and the water supply valve connected to the tank body. The supply destination of the stored water can be switched between the circulating water path and the water supply pipe, and the control device has the water storage amount of the water storage unit measured by the second measurement sensor smaller than a lower limit value. 6. The exhaust gas treatment apparatus according to claim 5, wherein the supply destination of the stored water in the tank main body is switched from the circulating water path to the water supply pipe by the water supply valve.
A throttling portion is provided on the downstream side of the connection portion with the water supply pipe in the circulating water path, and water is supplied to the exhaust gas introduction section of the scrubber by branching from the upstream side with respect to the connection portion with the water supply pipe in the circulation water path. The exhaust gas treatment apparatus according to claim 6, wherein a cleaning water path is provided.
A ship comprising the exhaust gas treatment apparatus according to any one of claims 4 to 7.