JP7372489B1 - water treatment equipment - Google Patents

Abstract

An object of the present invention is to provide a water treatment device in which it is possible to select whether or not to drain scrubber water used for cleaning exhaust gas from a marine internal combustion engine to the outside of the ship. [Solution] A water treatment device that is one aspect of the present invention is a device that processes scrubber water containing foreign matter that has been removed by cleaning exhaust gas from a marine internal combustion engine. a foreign matter removal system that removes foreign matter from the scrubber water by separating it from the waste water; a storage tank that stores the residue and the scrubber water; and a scrubber drain pipe, a first drain pipe, and a second drain pipe for discharging the scrubber water. , a drain branching valve that branches the scrubber drain pipe into a first drain pipe and a second drain pipe. When the marine internal combustion engine operates on alternative fuel, the drain branch valve communicates the scrubber drain pipe with the first drain pipe leading outside the ship, and when the marine internal combustion engine operates on fossil fuel, the drain branch valve communicates with the scrubber drain pipe. and a second drain pipe leading to the storage tank. [Selection diagram] Figure 1

Description

The present invention relates to a water treatment device for treating exhaust gas cleaning water from a marine internal combustion engine mounted on a ship.

Conventionally, in the field of ships, exhaust gas cleaning devices (scrubbers) for cleaning exhaust gas discharged from marine internal combustion engines are known. Generally, a scrubber injects cleaning water to the exhaust gas, thereby removing foreign substances such as sulfur oxides and particulate matter (PM) such as soot and dust from the exhaust gas, thereby cleaning the exhaust gas. Such a scrubber is installed, for example, in an exhaust gas recirculation (EGR) system, which is a method of reducing nitrogen oxides in exhaust gas.

An EGR system uses a scrubber to clean a portion of exhaust gas discharged from a marine internal combustion engine, mixes the cleaned exhaust gas with fresh air (newly taken in air), and recirculates the mixture to the marine internal combustion engine. Thereby, the EGR system suppresses the production of nitrogen oxides due to the combustion of fuel in the combustion chamber of a marine internal combustion engine, thereby reducing the content of nitrogen oxides in the exhaust gas (i.e., the amount of nitrogen oxides emitted). .

On the other hand, the water used for cleaning exhaust gas in a scrubber (hereinafter referred to as scrubber water) is generally treated after cleaning the exhaust gas to remove foreign substances and then used again for cleaning the exhaust gas. . For this reason, a water treatment device (for example, see Patent Document 1) that performs treatment such as foreign matter removal on scrubber water is applied to the scrubber.

In a water treatment device, foreign matter is removed from scrubber water by separating the scrubber water and foreign matter using, for example, a centrifuge or a filtration device. The scrubber water after removing foreign matter is reused for cleaning exhaust gas. However, even after removing foreign substances, some scrubber water may be separated as waste water depending on its properties. Even after foreign matter has been removed, foreign matter originating from the exhaust gas from the marine internal combustion engine may remain in the scrubber water to be drained without being completely removed. In particular, if the marine internal combustion engine is a fossil fuel-only internal combustion engine that burns fossil fuels such as diesel fuel, the scrubber water to be drained may contain foreign substances containing a large amount of carbon such as soot and oil. It cannot be completely removed and remains. One possible way to dispose of this scrubber water is to discharge it from a ship into the ocean (ocean dumping). However, in order to dump scrubber water into the ocean, the amount of carbon components contained in the scrubber water to be discharged must fall within standards for ocean dumping (hereinafter referred to as discharge standards). As mentioned above, scrubber water containing residual foreign matter containing a large amount of carbon cannot be dumped into the ocean because it exceeds this discharge standard. Therefore, scrubber water that cannot be dumped into the ocean is temporarily stored in a tank onboard a ship, and is landed at an appropriate time and disposed of (for example, disposed of as industrial waste).

JP 2019-118903 Publication

In recent years, in the field of ships, marine internal combustion engines that can use alternative fuels to replace fossil fuels (marine internal combustion engines compatible with alternative fuels) have been developed to reduce greenhouse gas (GHG) emissions. is being developed. The alternative fuel here is a decarbonized fuel that does not contain a carbon component, such as ammonia or hydrogen. For example, marine internal combustion engines compatible with alternative fuels burn fossil fuels and alternative fuels together (mixed combustion), so the content of carbon components in the exhaust gas is lower than that of marine internal combustion engines that burn only fossil fuels. In some cases, the exhaust gas contains almost no carbon-containing foreign matter. In this case, since the scrubber water after cleaning the exhaust gas contains almost no carbon-containing foreign matter, the scrubber water to be discharged can be dumped into the ocean without the need to temporarily store it in a tank onboard the ship, in accordance with the discharge standards. It becomes possible.

However, with the above-mentioned conventional water treatment equipment, even if the scrubber water contains almost no carbon-containing foreign matter, it is not possible to choose to dump the scrubber water into the ocean, and the use of marine internal combustion engines that burn exclusively on fossil fuels is not possible. As in the previous case, the scrubber water to be drained must be temporarily stored in a tank onboard the ship.

The present invention has been made in view of the above circumstances, and it is possible to select whether or not to drain the scrubber water used for cleaning exhaust gas from a marine internal combustion engine to the outside of the ship. The purpose is to provide water treatment equipment.

In order to solve the above-mentioned problems and achieve the objects, a water treatment device according to the present invention is used for cleaning exhaust gas discharged from a marine internal combustion engine, and processes scrubber water containing foreign substances removed from the exhaust gas. The water treatment device includes a foreign matter removal system that separates the scrubber water into a residue containing the foreign matter and a scrubber wastewater containing less foreign matter than the residue, and removes the foreign matter from the scrubber water. a storage tank for storing the residue and the scrubber waste water, a scrubber drain pipe for discharging the scrubber waste water from the foreign matter removal system, and a first drain pipe for discharging the scrubber waste water overboard; a second drain pipe for discharging the scrubber waste water to the storage tank; the scrubber drain pipe is branched into the first drain pipe and the second drain pipe; the scrubber drain pipe and the first drain pipe; or a drain branch valve that selectively communicates with the second drain pipe, and when the marine internal combustion engine is performing an alternative fuel operation in which at least decarbonized fuel is burned, the drain branch valve When the scrubber drain pipe and the first drain pipe communicate with each other and the marine internal combustion engine is performing fossil fuel operation in which fossil fuel is burned, the drain branch valve communicates with the scrubber drain pipe and the second drain pipe. It is characterized by communicating.

Moreover, in the above invention, the water treatment device according to the present invention includes: a residue discharge pipe for discharging the residue from the foreign matter removal system; a first residue pipe for discharging the residue to the outside of the ship; a second residue pipe for discharging residue to the storage tank; the residue discharge pipe is branched into the first residue pipe and the second residue pipe; and the residue discharge pipe is connected to the first residue pipe or the first residue pipe. a residue path branching valve that selectively communicates between the residue discharge pipe and the first residue pipe when the marine internal combustion engine is performing the alternative fuel operation; When the marine internal combustion engine is operating on fossil fuel, the residue path branch valve communicates the residue discharge pipe with the second residue pipe.

Further, in the above invention, the water treatment device according to the present invention determines which of the alternative fuel operation and the fossil fuel operation the marine internal combustion engine is in, and determines whether the marine internal combustion engine is in the alternative fuel operation or the fossil fuel operation. In the case of fossil fuel operation, the opening degree of the drain branch valve is controlled so as to communicate the scrubber drain pipe and the first drain pipe, and in the case of the fossil fuel operation, the scrubber drain pipe and the second drain pipe are communicated. The present invention is characterized in that it further includes a control device that controls the opening degree of the drainage channel branching valve so as to control the opening degree of the drainage channel branching valve.

Further, in the above invention, the water treatment device according to the present invention determines which of the alternative fuel operation and the fossil fuel operation the marine internal combustion engine is in, and determines whether the marine internal combustion engine is in the alternative fuel operation or the fossil fuel operation. In the case of fossil fuel operation, the opening degree of the residue path branching valve is controlled so that the residue discharge pipe and the first residue pipe communicate with each other, and in the case of the fossil fuel operation, the residue discharge pipe and the second residue pipe are communicated with each other. The present invention is characterized in that it further includes a control device that controls the opening degree of the residue path branching valve so as to cause the residue path branching valve to open.

According to the present invention, it is possible to select whether or not to drain the scrubber water used for cleaning exhaust gas from a marine internal combustion engine to the outside of the ship.

FIG. 1 is a schematic diagram showing a configuration example of a water treatment apparatus according to Embodiment 1 of the present invention. FIG. 2 is a flow diagram illustrating one control procedure for the flow of scrubber water by the water treatment apparatus according to Embodiment 1 of the present invention. FIG. 3 is a schematic diagram showing a configuration example of a water treatment device according to Embodiment 2 of the present invention. FIG. 4 is a flow diagram illustrating one control procedure for the flow of residue by the water treatment apparatus according to Embodiment 2 of the present invention.

EMBODIMENT OF THE INVENTION Below, with reference to an accompanying drawing, the preferred embodiment of the water treatment apparatus based on this invention is described in detail. Note that the present invention is not limited to this embodiment. Furthermore, it should be noted that the drawings are schematic, and the dimensional relationship of each element, the ratio of each element, etc. may differ from the actual one. Drawings may also include portions that differ in dimensional relationships and ratios. Further, in each drawing, the same components are given the same reference numerals.

(Embodiment 1)
The configuration of a water treatment device according to Embodiment 1 of the present invention will be described. FIG. 1 is a schematic diagram showing an example of the configuration of a water treatment device according to Embodiment 1 of the present invention. The water treatment device 10 according to Embodiment 1 of the present invention processes scrubber water after cleaning exhaust gas discharged from a marine internal combustion engine 110.

For example, as shown in FIG. 1, a water treatment device 10 includes a collecting tank 1 for storing scrubber water after exhaust gas cleaning, a circulation system 2 for circulating the scrubber water, and a collecting tank 1 for storing scrubber water after exhaust gas cleaning, a circulation system 2 for circulating the scrubber water, and a collecting tank 1 for storing scrubber water after exhaust gas cleaning. A foreign matter removal system 3 is provided. The water treatment device 10 also includes a hydrometer 4 for measuring the specific gravity of scrubber water, a branch valve 5 for discharging scrubber water whose specific gravity has increased excessively (scrubber water to be drained) from a foreign matter removal system 3, and a scrubber. It includes a drain pipe 6, a first drain pipe 7, a second drain pipe 8, and a drain branch valve 9 for discharging scrubber water to be drained outside or inside the ship. The water treatment device 10 also includes a residue discharge pipe 11 for discharging the residue containing foreign substances removed from the scrubber water from the foreign substance removal system 3, and a sludge tank 15 for storing the residue and the like. Furthermore, the water treatment device 10 includes a fresh water supply section 16 that supplies fresh water to the collecting tank 1, a pH adjustment section 17 that adjusts the pH of the scrubber water, and a liquid level Ls of the scrubber water in the collecting tank 1. It includes a level detection unit 18 for detecting the level and a control device 19. In FIG. 1, the flow of fluids such as scrubber water and exhaust gas and piping are appropriately illustrated by solid line arrows. Electric signal lines are appropriately illustrated by dashed lines. This also applies to other drawings.

Further, as shown in FIG. 1, the water treatment device 10 is applied to a scrubber 101 that cleans exhaust gas discharged from a marine internal combustion engine 110 using scrubber water. In the first embodiment, the scrubber 101 is a component of the EGR system 100 that recirculates part of the exhaust gas from the marine internal combustion engine 110 to the marine internal combustion engine 110 as recirculation gas. Hereinafter, exhaust gas means exhaust gas discharged from the marine internal combustion engine 110, unless otherwise specified.

The marine internal combustion engine 110 targeted in the first embodiment is, for example, a type of internal combustion engine that operates by burning at least one of a fossil fuel and an alternative fuel in a combustion chamber, and is installed in an engine room of a ship. The operation modes of this type of marine internal combustion engine 110 include a fossil fuel operation mode in which the engine is operated using only fossil fuel as the combustion fuel, and an alternative fuel operation mode in which the engine is operated using at least an alternative fuel as the combustion fuel. It will be done. For example, the alternative fuel operation mode includes an operation mode in which the engine is operated by co-combusting fossil fuel and alternative fuel, and an operation mode in which the engine is operated by burning only the alternative fuel. Note that fossil fuels are fuels obtained by refining petroleum (crude oil), such as heavy oil or light oil. The alternative fuel is a fuel that can replace fossil fuels, and is a decarbonized fuel that does not contain carbon components, such as ammonia fuel or hydrogen fuel.

In the marine internal combustion engine 110 as described above, when the engine is operated in the fossil fuel operation mode, for example, foreign matter containing a large amount of carbon components such as soot is contained in the exhaust gas. In this case, the scrubber water used to clean the exhaust gas contains foreign matter (hereinafter referred to as carbon-containing foreign matter) in such a large amount that the carbon components removed from the exhaust gas exceed emission regulations. . On the other hand, when the marine internal combustion engine 110 is operated in the alternative fuel operation mode, the content of carbon components contained in foreign substances in the exhaust gas is smaller than that in the exhaust gas in the fossil fuel operation mode. In this case, the scrubber water used to clean the exhaust gas contains little or no carbon components derived from the exhaust gas, and the content of carbon components contained in foreign substances in the scrubber water is, for example, below the emission regulation.

Examples of the foreign matter (foreign matter derived from exhaust gas) in the scrubber water include soot (soot dust), unburned oil, and sulfur oxides. That is, the components contained in the foreign matter include carbon components such as soot and oil (hydrocarbons), and components other than carbon components such as sulfur oxides. In this specification, a foreign substance that does not contain carbon components is defined as a foreign substance that contains less carbon components than exhaust gas in fossil fuel operation mode and does not exceed the emission regulations as described above. . In the first embodiment, depending on the operation mode of the marine internal combustion engine 110, the water treatment device 10 may treat scrubber water containing foreign substances containing carbon components, or may treat scrubber water containing foreign substances that do not contain carbon components. may also be processed. Hereinafter, foreign matter containing a carbon component derived from exhaust gas and foreign matter not containing a carbon component may be collectively referred to as foreign matter. Moreover, a ship means a ship equipped with a marine internal combustion engine 110 unless otherwise specified.

Specifically, in the water treatment apparatus 10 shown in FIG. 1, the collecting tank 1 is a tank that collects scrubber water. For example, as shown in FIG. 1, the collecting tank 1 communicates with the lower part (bottom in FIG. 1) of the demister 102 of the EGR system 100 via a collection pipe 104. Note that the demister 102 is a component of the EGR system 100, and is connected to the scrubber 101 as shown in FIG. The collecting tank 1 collects scrubber water used for cleaning exhaust gas in the scrubber 101 from the demister 102 through the collection pipe 104. For example, as shown in FIG. 1, a pump 105 is provided in the recovery pipe 104. The used scrubber water flows from the scrubber 101 into the demister 102 and then flows into the collecting tank 1 through the collection pipe 104 due to the action of the pump 105 or the like. The collecting tank 1 temporarily stores the scrubber water collected in this way.

The circulation system 2 is a system for circulating scrubber water from the collecting tank 1 toward the scrubber 101. As shown in FIG. 1, the circulation system 2 includes a circulation pipe 21 and a circulation pump 22.

The circulation pipe 21 has an inlet end connected to the lower part of the collecting tank 1 and an outlet end connected to the inlet end of the injection part 101a of the scrubber 101. The circulation pump 22 is provided in the middle of the circulation pipe 21. The circulation pump 22 pumps the scrubber water that has flowed into the circulation pipe 21 from the collecting tank 1 toward the scrubber 101 . Thereby, the circulation pump 22 generates a flow of scrubber water in the circulation pipe 21 from the collecting tank 1 side toward the scrubber 101 side.

In the circulation system 2 having such a configuration, the circulation pipe 21 sends the scrubber water in the collecting tank 1 to the injection part 101a of the scrubber 101 by the action of the circulation pump 22. The sent scrubber water is injected from the injection part 101a in the scrubber 101 and used (reused) for cleaning exhaust gas in the scrubber 101. The scrubber water used to clean the exhaust gas flows from the scrubber 101 into the demister 102 while containing foreign matter removed from the exhaust gas, and is then collected into the collecting tank 1 through the collection pipe 104. In this way, the circulation system 2 repeatedly circulates the scrubber water between the collecting tank 1 and the scrubber 101.

The foreign matter removal system 3 is a system that separates the scrubber water after cleaning the exhaust gas into a residue containing foreign matter and scrubber wastewater containing less foreign matter than the residue, and removes foreign matter from the scrubber water. . For example, as shown in FIG. 1, the foreign matter removal system 3 includes a branch pipe 31, an outlet pipe 32, a merging pipe 33, and a centrifuge 34.

The branch pipe 31 constitutes piping for extracting scrubber water from the circulation system 2. As shown in FIG. 1, the branch pipe 31 has an inlet end connected to the circulation pipe 21 of the circulation system 2, and an outlet end connected to the inlet of the centrifugal separator 34. In the first embodiment, the branch pipe 31 branches from the circulation pipe 21 and allows the circulation pipe 21 and the centrifugal separator 34 to communicate with each other. The branch pipe 31 extracts a portion of the scrubber water flowing through the circulation pipe 21 and guides the scrubber water extracted from the circulation pipe 21 to the centrifuge 34 .

The outlet pipe 32 and the merging pipe 33 constitute piping for returning the scrubber water after foreign matter removal by the centrifugal separator 34 to the circulation system 2. As shown in FIG. 1, the outlet pipe 32 has an inlet end connected to the outlet of the centrifuge 34 and an outlet end connected to the branch valve 5. The outlet pipe 32 receives the scrubber water from the centrifugal separator 34 after removing foreign matter, and guides the received scrubber water to the branch valve 5 . Further, the outlet pipe 32 is connected to a merging pipe 33 and a scrubber drain pipe 6 via a branch valve 5 so as to be communicable. That is, the outlet pipe 32 and the confluence pipe 33 are the pipes of the foreign matter removal system 3 in which the branch valve 5 is provided. In the first embodiment, the scrubber water led from the outlet pipe 32 to the branch valve 5 flows into either the merging pipe 33 or the scrubber drain pipe 6 via the branch valve 5.

The confluence pipe 33 is a pipe for returning the scrubber water from which foreign matter has been removed by the centrifuge 34 to the circulation system 2 . As shown in FIG. 1, the merging pipe 33 has an inlet end connected to the branch valve 5 and an outlet end connected to a midway part of the circulation pipe 21 (for example, downstream of the branch pipe 31 in the scrubber water flow direction). Ru. The confluence pipe 33 receives the scrubber water after removing foreign matter from the outlet pipe 32 via the branch valve 5, and circulates the received scrubber water as scrubber water to be reused for exhaust gas cleaning (scrubber water to be reused). 21 and return.

The centrifugal separator 34 is an example of a removal device that removes foreign matter from the scrubber water in the foreign matter removal system 3. In the first embodiment, the centrifugal separator 34 receives scrubber water extracted from the circulation pipe 21 through the branch pipe 31, and removes foreign substances from the received scrubber water. At this time, the centrifugal separator 34 utilizes the difference in specific gravity between the received scrubber water and the foreign matter to separate the scrubber water into residue containing foreign matter and scrubber waste water containing less foreign matter than the residue. (centrifugation). That is, the scrubber wastewater is scrubber water after foreign matter has been removed by the centrifugal separator 34. The centrifugal separator 34 sends the scrubber waste water to the outlet pipe 32 and sends the residue containing removed foreign matter to the residue discharge pipe 11. Hereinafter, unless otherwise specified, the term "residue" refers to the residue separated from the scrubber water as described above, which contains foreign substances removed from the scrubber water.

The hydrometer 4 measures the specific gravity of the scrubber water. In the first embodiment, the hydrometer 4 is provided in the branch pipe 31, as shown in FIG. 1, for example. The hydrometer 4 measures the specific gravity of the scrubber water flowing through the branch pipe 31 (that is, the scrubber water extracted from the circulation pipe 21 through the branch pipe 31). The measurement of the specific gravity of the scrubber water by the hydrometer 4 may be carried out continuously in time series, may be carried out intermittently at predetermined time intervals, or may be carried out in accordance with a measurement instruction from the control device 19. It may be done in some cases. The hydrometer 4 transmits an electric signal indicating the obtained specific gravity (measured value) of the scrubber water to the control device 19 each time the specific gravity of the scrubber water is measured.

The branch valve 5 is a valve for flowing the scrubber water in the piping of the foreign matter removal system 3 to the circulation pipe 21 side or the scrubber drain pipe 6 side. As shown in FIG. 1, the branch valve 5 is constituted by a three-way valve or the like, and is provided in the piping of the foreign matter removal system 3 (in the first embodiment, the piping is constituted by an outlet pipe 32 and a confluence pipe 33). Specifically, among the three openings that the branch valve 5 has, the outlet end of the outlet pipe 32 is connected to the first opening, and the inlet end of the merging pipe 33 is connected to the second opening. , the inlet end of the scrubber drain pipe 6 is connected to the third opening. The branch valve 5 increases the opening degree between the outlet pipe 32 and the merging pipe 33 and the opening degree between the outlet pipe 32 and the scrubber drain pipe 6 as the opening degree of the other increases. Each of these opening degrees is adjusted by, for example, decreasing the opening degree. In the first embodiment, the branch valve 5 adjusts one of these opening degrees to be fully open, and then adjusts the other opening degree to be fully closed. This opening degree adjustment is controlled by the control device 19, and based on this control, the branch valve 5 changes the flow destination of the scrubber waste water from the outlet pipe 32 to the merging pipe 33 (scrubber water circulation route side) and the scrubber drain pipe 6 ( (Scrubber water discharge route side).

The scrubber drain pipe 6 is a pipe for discharging scrubber waste water from the foreign matter removal system 3. As shown in FIG. 1, the scrubber drain pipe 6 has an inlet end connected to the above-mentioned branch valve 5, and an outlet end connected to the drain branch valve 9. The scrubber drain pipe 6 branches off from the piping of the foreign matter removal system 3 via the branch valve 5, and forms part of a drainage channel for discharging scrubber waste water. The scrubber drain pipe 6 receives from the outlet pipe 32 via the branch valve 5 the scrubber waste water that is to be drained because the specific gravity has increased excessively, for example, out of the scrubber waste water sent out from the centrifuge 34 through the outlet pipe 32. . The scrubber drain pipe 6 distributes the received scrubber waste water toward the first drain pipe 7 or the second drain pipe 8 via the drain branch valve 9.

The first drain pipe 7 is a pipe that constitutes a drainage channel for discharging scrubber waste water to the outside of the ship. As shown in FIG. 1, the first drain pipe 7 is configured such that its inlet end is connected to a drain branch valve 9 and branches from the scrubber drain pipe 6 via the drain branch valve 9. Although not particularly illustrated, the outlet end of the first drain pipe 7 communicates with the outside of the ship (the ocean, etc.). The first drain pipe 7 receives the scrubber waste water from the scrubber drain pipe 6 via the drain branch valve 9, distributes the received scrubber waste water outside the ship, and thereby discharges the scrubber waste water outside the ship ( can be dumped into the ocean).

The second drain pipe 8 is a pipe that constitutes a drainage channel for discharging scrubber waste water to the sludge tank 15 inside the ship. As shown in FIG. 1, the second drain pipe 8 has an inlet end connected to the drain branch valve 9 and an outlet end connected to the sludge tank 15. That is, the second drain pipe 8 branches from the scrubber drain pipe 6 via the drain branch valve 9 and communicates with the sludge tank 15 . The second drain pipe 8 receives scrubber waste water from the scrubber drain pipe 6 via the drain branch valve 9, and discharges the received scrubber waste water to the sludge tank 15.

The drain branch valve 9 is for distributing the scrubber waste water discharged from the foreign matter removal system 3 through the scrubber drain pipe 6 to the first drain pipe 7 leading to the outside of the ship or the second drain pipe 8 leading to the sludge tank 15 inside the ship. It is the valve of As shown in FIG. 1, the drain branching valve 9 is constituted by a three-way valve or the like, and branches the scrubber drain pipe 6 into a first drain pipe 7 and a second drain pipe 8. That is, among the three openings that the drain branch valve 9 has, the outlet end of the scrubber drain pipe 6 is connected to the first opening, and the inlet end of the first drain pipe 7 is connected to the second opening. The inlet end of the second drain pipe 8 is connected to the third opening. The drain branch valve 9 controls one of the opening degrees between the scrubber drain pipe 6 and the first drain pipe 7 and the opening degree between the scrubber drain pipe 6 and the second drain pipe 8. Each of these opening degrees is adjusted by, for example, decreasing the other opening degree as the opening degree increases. In the first embodiment, the drain branch valve 9 adjusts one of these opening degrees to be fully open, and then adjusts the other opening degree to fully closed. For example, this opening adjustment is controlled by the control device 19, and based on this control, the drain branch valve 9 selectively connects the scrubber drain pipe 6 with the first drain pipe 7 or the second drain pipe 8. . Such a drain branch valve 9 allows communication between the scrubber drain pipe 6 and the first drain pipe 7 when the marine internal combustion engine 110 is operating on alternative fuel, and allows communication between the scrubber drain pipe 6 and the first drain pipe 7 when the marine internal combustion engine 110 is operating on fossil fuel. If so, the scrubber drain pipe 6 and the second drain pipe 8 are communicated with each other.

Note that the alternative fuel operation is an operation of the marine internal combustion engine 110 performed by burning at least an alternative fuel (decarbonized fuel). At this time, the operating mode of the marine internal combustion engine 110 is the alternative fuel operating mode described above. Fossil fuel operation is operation of the marine internal combustion engine 110 performed by burning only fossil fuels. At this time, the operating mode of the marine internal combustion engine 110 is the fossil fuel operating mode described above.

The residue discharge pipe 11 is a pipe for discharging the residue containing foreign substances removed from the scrubber water from the foreign substance removal system 3 as described above. As shown in FIG. 1, the residue discharge pipe 11 has an inlet end connected to the residue discharge port of the centrifugal separator 34, and an outlet end connected to the sludge tank 15. The residue discharge pipe 11 receives from the centrifuge 34 residue containing foreign substances (for example, sludge-like residue) removed from the scrubber water, discharges the received residue from the foreign substance removal system 3, and removes the sludge. Send it to tank 15.

The sludge tank 15 is an example of a storage tank that stores the residue discharged from the foreign matter removal system 3 and the scrubber waste water. As shown in FIG. 1, the sludge tank 15 is provided at a position below the centrifugal separator 34, and is connected to the residue discharge pipe 11 as described above. In the first embodiment, the sludge tank 15 collects and stores the residue discharged through the residue discharge pipe 11 and the scrubber wastewater discharged through the second drain pipe 8 until they are unloaded from the ship.

The fresh water supply section 16 supplies the collecting tank 1 with fresh water for increasing and diluting the scrubber water. The fresh water replenishment unit 16 includes, for example, a fresh water tank, a replenishment pipe, a replenishment pump, etc. (all not shown), and is configured to be able to replenish fresh water to the collecting tank 1 through the replenishment pipe, as shown in FIG. be done. Examples of the fresh water supplied from the fresh water supply part 16 to the collecting tank 1 include fresh water loaded from outside the ship, fresh water produced inside the ship, and drain water discharged from the marine internal combustion engine 110. In the first embodiment, the fresh water replenishment unit 16 acquires the liquid level Ls of the scrubber water in the collecting tank 1 from the level detection unit 18, and makes sure that the acquired liquid level Ls falls within a predetermined threshold level range. Next, the timing and amount of fresh water supplied to the collecting tank 1 are controlled. The scrubber water in the collecting tank 1 is replenished with fresh water by the fresh water replenishing section 16, so that the amount of the scrubber water is increased and diluted. This reduces the specific gravity of the scrubber water.

The pH adjustment section 17 is for adjusting (neutralizing) the pH of the scrubber water in the collecting tank 1. The pH adjustment unit 17 includes, for example, an alkaline liquid tank, a supply pipe, a supply pump, a pH meter, etc. (all not shown), and supplies the alkaline liquid to the collecting tank 1 through the supply pipe, as shown in FIG. be configured so as to be able to do so. Here, each time the scrubber water is used for cleaning exhaust gas in the scrubber 101, the content of foreign substances such as sulfur oxides removed from the exhaust gas increases in the scrubber water. Therefore, the scrubber water becomes more acidic. Therefore, as a chemical solution for adjusting the pH of the scrubber water, an alkaline solution, which is a chemical solution with a high alkaline value, is used. Examples of the alkaline liquid include sodium hydroxide. Among the foreign substances in the scrubber water, sulfur oxides are removed by the action of the pH adjustment section 17.

In the first embodiment, the pH adjustment unit 17 measures the pH of the scrubber water in the collecting tank 1, and if the obtained pH measurement value is less than a predetermined threshold, the pH adjustment unit 17 supplies the alkaline solution to the collecting tank 1. supply As a result, the scrubber water in the collecting tank 1 is neutralized with the alkaline solution, and the pH of the scrubber water increases. Further, the pH adjustment unit 17 stops supplying the alkaline solution to the collecting tank 1 when the obtained pH measurement value is equal to or higher than a predetermined threshold value. The above pH threshold is set, for example, in a range in which each member such as piping that comes into contact with the scrubber water in the water treatment device 10 does not corrode, or in a range in which the removal performance of sulfur oxides in the scrubber 101 is not impaired. On the other hand, as the neutralization reaction between the scrubber water and the alkaline liquid progresses, the content of by-products such as Na ₂ SO ₄ generated in the scrubber water increases. This increases the specific gravity of the scrubber water.

The level detection unit 18 detects the liquid level Ls of scrubber water in the collecting tank 1. For example, as shown in FIG. 1, the level detection unit 18 is provided in the collecting tank 1 in such a manner that it has detectors at each of the low level and high level positions in the height direction of the collecting tank 1. The level detection unit 18 detects that the liquid level Ls is lower than the low level when the liquid level Ls of the scrubber water in the collecting tank 1 is lower than the low level detector. In this case, the level detection section 18 transmits an electrical signal to the fresh water replenishment section 16 indicating that the liquid level Ls is less than the low level. On the other hand, when the liquid level Ls reaches a position higher than the high level detector, the level detection unit 18 detects that the liquid level Ls is higher than the high level. In this case, the level detection section 18 transmits to the fresh water replenishment section 16 an electrical signal indicating that the liquid level Ls is higher than the high level.

In the first embodiment, the above-mentioned low level and high level are respectively threshold levels of the liquid level that are preset in the range between the lower limit level and the upper limit level in the equipment specifications of the collecting tank 1. That is, the low level is a threshold level that is greater than or equal to the lower limit level of the collecting tank 1 and less than the above-mentioned high level. The high level is a threshold level higher than the above-mentioned low level and below the upper limit level of the collecting tank 1. When the scrubber water in the collecting tank 1 is increased (diluted) with fresh water until the liquid level Ls has decreased below the low level and has risen above the high level, the specific gravity of this scrubber water is , becomes so low that it does not interfere with the centrifugal separator 34's separation process of scrubber water and foreign matter. These low and high levels are preset so that the above phenomenon can be realized.

The control device 19 controls the flow of scrubber water in the water treatment device 10. Specifically, the control device 19 includes a CPU, a memory, a sequencer, etc. for executing various programs. When controlling the flow of scrubber water, the control device 19 receives electrical signals from each of the hydrometer 4 and the marine internal combustion engine 110, and controls the above-mentioned branch valve 5 and drain channel branch valve 9 based on these electrical signals. control each.

For example, the control device 19 compares the specific gravity of the scrubber water measured by the hydrometer 4 with a predetermined reference value set in advance, and controls the branch valve 5 based on the comparison result. In the first embodiment, the control device 19 controls the opening degree of the branch valve 5 so as to communicate the outlet pipe 32 and the scrubber drain pipe 6 when the measured specific gravity of the scrubber water is equal to or higher than the above reference value. . Thereby, the control device 19 controls the flow of the scrubber drainage so that the scrubber drainage is discharged from the foreign matter removal system 3 to the scrubber drainage pipe 6 (ie, to the drainage channel side). Further, when the measured specific gravity of the scrubber water is less than the above-mentioned reference value, the control device 19 controls the opening degree of the branch valve 5 so as to communicate the outlet pipe 32 and the merging pipe 33. Thereby, the control device 19 controls the flow of the scrubber waste water so that the scrubber waste water is sent (returned) from the foreign matter removal system 3 to the circulation pipe 21 of the circulation system 2 as a reuse target.

Note that, as described above, the reference value preset in the control device 19 may be, for example, an upper limit value in the specific gravity range of the scrubber water that does not interfere with the separation process of the scrubber water and foreign substances by the centrifugal separator 34. used. Hereinafter, the reference value means a predetermined reference value set in advance for the specific gravity of the scrubber water, as described above, unless otherwise specified.

Further, the control device 19 determines whether the operation mode of the marine internal combustion engine 110 is an alternative fuel operation or a fossil fuel operation, based on the electrical signal received from the marine internal combustion engine 110. In the case of alternative fuel operation, the control device 19 controls the opening degree of the drain branch valve 9 so that the scrubber drain pipe 6 and the first drain pipe 7 are communicated with each other. Thereby, the control device 19 controls the flow of the scrubber waste water so that the scrubber waste water is discharged overboard. In the case of fossil fuel operation, the control device 19 controls the opening degree of the drain branch valve 9 so as to communicate the scrubber drain pipe 6 and the second drain pipe 8. Thereby, the control device 19 controls the flow of the scrubber waste water so that the scrubber waste water is discharged to the sludge tank 15 inside the ship.

Note that the operating mode of the marine internal combustion engine 110 is switched to the above-described alternative fuel operating mode or fossil fuel operating mode in accordance with the operator's operation of the operating unit (not shown) of the marine internal combustion engine 110. In this way, each time the operation mode of the marine internal combustion engine 110 (hereinafter sometimes abbreviated as engine operation mode) is switched, a device such as an operating section or a control device of the marine internal combustion engine 110 sends a message to the control device 19 about the engine. An electrical signal indicating that the operating mode is an alternative fuel operating mode or an electrical signal indicating that the engine operating mode is a fossil fuel operating mode is transmitted.

On the other hand, the EGR system 100 recirculates a part of the exhaust gas discharged from the marine internal combustion engine 110 mounted on the ship to the marine internal combustion engine 110 as recirculation gas, thereby reducing the content of nitrogen oxides in the exhaust gas. This is a system to reduce As shown in FIG. 1, the EGR system 100 includes a scrubber 101, a demister 102, and an EGR blower 103.

The scrubber 101 cleans a portion of the exhaust gas discharged from the marine internal combustion engine 110 for use as recirculation gas, and the water treatment device 10 according to the first embodiment is applied thereto. As shown in FIG. 1, a portion of exhaust gas is supplied to the scrubber 101 from a marine internal combustion engine 110 through piping or the like. The scrubber 101 includes a spraying section 101a such as a nozzle that sprays scrubber water onto the exhaust gas to be cleaned. This injection part 101a is configured so that scrubber water is supplied through the circulation pipe 21. The scrubber 101 injects scrubber water from the injection part 101a to a part of the exhaust gas (recirculated gas) fed from the marine internal combustion engine 110 side, thereby removing soot dust, sulfur oxides, etc. from the recirculating gas. Clean the recirculated gas by removing foreign matter. Note that, of the exhaust gas discharged from the marine internal combustion engine 110, the remaining exhaust gas that is not sent to the scrubber 101 is discharged out of the ship from a chimney through a pipe or the like.

The demister 102 is a hollow rectangular casing, and is connected to the outlet of the scrubber 101. Further, a collection pipe 104 communicating with the collecting tank 1 mentioned above is connected to the lower part (bottom part) of the demister 102. The recirculated gas cleaned by the scrubber 101 by spraying scrubber water and the scrubber water used to clean the recirculated gas flow into such a demister 102 . The demister 102 separates the recirculated gas after cleaning and the scrubber water after use. Of these recirculated gas and scrubber water, the recirculated gas is sent to the EGR blower 103 from the gas discharge port of the demister 102, and the scrubber water is collected from the lower part of the demister 102 into the collecting tank 1 through the collection pipe 104.

The EGR blower 103 is provided above the demister 102, as shown in FIG. The EGR blower 103 sends the recirculated gas sent out from the demister 102 to the marine internal combustion engine 110 through piping or the like. The recirculated gas sent out from the EGR blower 103 is sent together with air (fresh air) to the combustion chamber of the marine internal combustion engine 110, and is used as combustion gas when operating the marine internal combustion engine 110.

Next, a procedure for controlling the flow of scrubber water by the water treatment device 10 will be described. FIG. 2 is a flow diagram illustrating one control procedure for the flow of scrubber water by the water treatment apparatus according to Embodiment 1 of the present invention. In the water treatment apparatus 10 described above (see FIG. 1), the control device 19 controls the flow of scrubber water by performing each process of steps S101 to S106 shown in FIG.

Specifically, in controlling the flow of scrubber water by the water treatment device 10, as shown in FIG. ).

In step S101, the control device 19 compares the specific gravity of the scrubber water measured by the hydrometer 4 with a reference value. Then, when the measured value of the specific gravity is greater than or equal to the reference value, the control device 19 determines that the specific gravity of the scrubber water is greater than or equal to the reference value. This corresponds to the fact that the specific gravity of the scrubber water that is repeatedly circulated between the water treatment device 10 and the scrubber 101 is equal to or higher than the reference value.

When the measured specific gravity of the scrubber water is equal to or higher than the reference value (Step S101, Yes), the control device 19 controls the opening degree of the branch valve 5 to open the scrubber drain pipe 6 (Step S102). In step S102, the control device 19 controls the opening degree of the branch valve 5 so that the scrubber drain pipe 6 side of the branch valve 5 is fully opened and the merging pipe 33 side is fully closed. Based on this opening degree control, the branch valve 5 selectively switches the destination of the scrubber waste water from the outlet pipe 32 from the merging pipe 33 side to the scrubber drain pipe 6 side. By controlling the opening degree of this branch valve 5, the control device 19 directs the scrubber drainage in the outlet pipe 32 (scrubber water after foreign matter has been removed by the centrifugal separator 34) from the foreign matter removal system 3 to the scrubber drainage pipe 6 side as a drainage target. Control the flow of scrubber water as it is discharged.

At this step S102, the scrubber water continues to be circulated between the collecting tank 1 and the scrubber 101 through the circulation pipe 21 and the like. In parallel with this, a part of the scrubber water extracted from the circulation pipe 21 to the branch pipe 31 does not return to the circulation pipe 21 from the merging pipe 33, but is discharged from the foreign matter removal system 3 through the scrubber drain pipe 6. As a result, the amount of scrubber water stored in the collecting tank 1 decreases, and the liquid level Ls of this scrubber water decreases accordingly. When the liquid level Ls of the scrubber water in the collecting tank 1 is less than the low level, the fresh water supply unit 16 supplies fresh water into the collecting tank 1. As a result, the liquid level Ls of the scrubber water increases. When the liquid level Ls of the scrubber water is equal to or higher than the high level, the fresh water supply unit 16 stops supplying fresh water into the collecting tank 1 .

After executing step S102, the control device 19 determines the engine operating mode (step S103). In step S103, the control device 19 determines whether the engine operation mode is the alternative fuel operation mode or the fossil fuel operation mode based on the electric signal from the marine internal combustion engine 110 (the electric signal indicating the engine operation mode). do.

Specifically, when the marine internal combustion engine 110 is operated to perform alternative fuel operation, the control device 19 receives an electrical signal from the marine internal combustion engine 110 indicating that the engine operating mode is the alternative fuel operating mode. . Based on the received electrical signal, the control device 19 determines that the current engine operation mode is the alternative fuel operation mode.

If it is determined that the engine operation mode is the alternative fuel operation mode (step S103, alternative fuel), the control device 19 controls the opening degree of the drain branch valve 9 to open the first drain pipe 7 (step S104). ). After that, the control device 19 returns to step S101 described above and repeats the processing from step S101 onwards.

In step S104, the control device 19 controls the opening degree of the drain branch valve 9 so that the first drain pipe 7 side of the drain branch valve 9 is fully opened and the second drain pipe 8 side is fully closed. . Based on this opening degree control, the drain branch valve 9 selectively switches the destination of the scrubber waste water from the scrubber drain pipe 6 from the second drain pipe 8 side to the first drain pipe 7 side. That is, the drain branch valve 9 cuts off communication between the scrubber drain pipe 6 and the second drain pipe 8 and allows the scrubber drain pipe 6 and the first drain pipe 7 to communicate with each other. The control device 19 controls the opening degree of the drain branch valve 9 so that the scrubber waste water during the alternative fuel operation mode is discharged (dumped into the ocean) overboard through the scrubber drain pipe 6 and the first drain pipe 7. Control the flow of scrubber water.

Here, when the engine operation mode is the alternative fuel operation mode, the foreign matter contained in the scrubber waste water after being used to clean the exhaust gas from the marine internal combustion engine 110 is a foreign matter that does not contain a carbon component, as described above. That is, the scrubber wastewater does not contain foreign substances containing carbon components, as defined above in the present invention. Scrubber wastewater that does not contain foreign substances containing carbon components is clean enough to be dumped into the ocean in accordance with emission regulations.

On the other hand, when the marine internal combustion engine 110 is operated to perform fossil fuel operation, the control device 19 receives an electrical signal from the marine internal combustion engine 110 indicating that the engine operating mode is the fossil fuel operating mode. In step S103 described above, the control device 19 determines that the current engine operation mode is the fossil fuel operation mode based on the received electrical signal.

If it is determined that the engine operation mode is the fossil fuel operation mode (step S103, fossil fuel), the control device 19 controls the opening degree of the drain branch valve 9 to open the second drain pipe 8 (step S105). ). After that, the control device 19 returns to step S101 described above and repeats the processing from step S101 onwards.

In step S105, the control device 19 controls the opening degree of the drain branch valve 9 so that the first drain pipe 7 side of the drain branch valve 9 is fully closed and the second drain pipe 8 side is fully open. . Based on this opening degree control, the drain branch valve 9 selectively switches the destination of the scrubber waste water from the scrubber drain pipe 6 from the first drain pipe 7 side to the second drain pipe 8 side. That is, the drain branching valve 9 blocks communication between the scrubber drain pipe 6 and the first drain pipe 7, and allows the scrubber drain pipe 6 and the second drain pipe 8 to communicate with each other. The control device 19 controls the opening of the drain branch valve 9 so that the scrubber waste water in the fossil fuel operation mode is discharged to the sludge tank 15 inside the ship through the scrubber drain pipe 6 and the second drain pipe 8. Control the flow of water.

Here, when the engine operation mode is the fossil fuel operation mode, the scrubber waste water after being used to clean the exhaust gas from the marine internal combustion engine 110 contains foreign matter containing carbon components. The scrubber wastewater containing foreign substances including carbon components is not dumped into the ocean, but is temporarily stored in the sludge tank 15 and disposed of after landing.

On the other hand, in step S101 described above, if the specific gravity of the scrubber water measured by the hydrometer 4 is less than the reference value, the controller 19 controls the scrubber water that is repeatedly circulated between the water treatment device 10 and the scrubber 101. It is determined that the specific gravity is not greater than the reference value (step S101, No). In this case, the control device 19 controls the opening degree of the branch valve 5 to close the scrubber drain pipe 6 (step S106). After that, the control device 19 returns to step S101 described above and repeats the processing from step S101 onwards.

In step S106, the control device 19 controls the opening degree of the branch valve 5 so that the scrubber drain pipe 6 side of the branch valve 5 is fully closed and the merging pipe 33 side is fully open. Based on this opening degree control, the branch valve 5 selectively switches the destination of the scrubber waste water from the outlet pipe 32 from the scrubber drain pipe 6 side to the merging pipe 33 side. The control device 19 controls the flow of the scrubber water by controlling the opening degree of the branch valve 5 so that the scrubber wastewater in the outlet pipe 32 is sent from the foreign matter removal system 3 to the circulation system 2 as scrubber water to be reused. Control.

At this step S106, in parallel with the circulation of the scrubber water between the collecting tank 1 and the scrubber 101 described above, some of the scrubber water extracted from the circulation pipe 21 to the branch pipe 31 is centrifuged. After the foreign matter is removed by the scrubber drain pipe 6, it returns to the circulation pipe 21 through the confluence pipe 33 without being discharged from the scrubber drain pipe 6. As a result, the amount of scrubber water in the collecting tank 1 is suppressed, and accordingly, the liquid level Ls of the scrubber water is suppressed from decreasing.

As described above, the water treatment device 10 according to Embodiment 1 of the present invention separates the scrubber water used for cleaning exhaust gas from the marine internal combustion engine 110 into residue and scrubber waste water, and removes the scrubber water. a foreign matter removal system 3 for removing foreign matter from the foreign matter removal system 3, a scrubber drainage pipe 6 for discharging scrubber drainage from the foreign matter removal system 3, a first drainage pipe 7 for discharging the scrubber drainage outside the ship, and a first drainage pipe 7 for discharging the scrubber drainage outside the ship. The scrubber drain pipe 6 is branched into a first drain pipe 7 and a second drain pipe 8, and the scrubber drain pipe 6 is connected to the first drain pipe 7 or the second drain pipe 8. A drain branch valve 9 that selectively communicates with the pipe 8 is provided. Further, in this water treatment device 10, when the marine internal combustion engine 110 is performing alternative fuel operation, the drain branch valve 9 allows the scrubber drain pipe 6 and the first drain pipe 7 to communicate with each other, so that the marine internal combustion engine 110 When fossil fuel operation is performed, the scrubber drain pipe 6 and the second drain pipe 8 are communicated.

With the above configuration, depending on the operating mode (alternative fuel operating mode or fossil fuel operating mode) of the marine internal combustion engine 110, the scrubber wastewater drainage channel can be used as a drainage channel for discharging water overboard (dumping into the ocean) or as a drainage channel inside the ship. A drainage channel for draining water (storage) into a storage tank. Therefore, it is possible to select whether or not to drain the scrubber water (scrubber water to be drained) used for cleaning the exhaust gas from the marine internal combustion engine 110 to the outside of the ship. Specifically, in alternative fuel operation mode, scrubber wastewater that does not contain foreign substances containing carbon components can be dumped into the ocean without the need to store it in onboard storage tanks, and in fossil fuel operation mode, scrubber wastewater that does not contain foreign substances containing carbon components can be dumped into the ocean. Scrubber wastewater containing foreign substances can be stored in onboard storage tanks without being dumped into the ocean.

(Embodiment 2)
Next, the configuration of a water treatment device according to Embodiment 2 of the present invention will be explained. FIG. 3 is a schematic diagram showing a configuration example of a water treatment device according to Embodiment 2 of the present invention. As shown in FIG. 3, the water treatment device 10A according to the second embodiment includes a residue discharge pipe 11B in place of the residue discharge pipe 11 of the water treatment device 10 according to the first embodiment described above, and a water treatment device 10A in place of the control device 19. The control device 19A is further provided with a first residue pipe 12, a second residue pipe 13, and a residue path branching valve 14. The other configurations are the same as those of the first embodiment, and the same components are given the same reference numerals.

The residue discharge pipe 11B is a pipe for discharging the residue produced by the foreign matter removal system 3 (specifically, the centrifugal separator 34) from the foreign matter removal system 3. As shown in FIG. 3, the residue discharge pipe 11B has an inlet end connected to the residue discharge port of the centrifugal separator 34, and an outlet end connected to the residue path branching valve 14. The residue discharge pipe 11B receives from the centrifuge 34 residue containing foreign matter (for example, sludge-like residue) removed from the scrubber water by the centrifuge 34. The residue discharge pipe 11B discharges the received residue from the foreign matter removal system 3 and causes it to flow toward the first residue pipe 12 or the second residue pipe 13 via the residue path branch valve 14.

The first residue pipe 12 is a pipe that constitutes a discharge path for discharging the residue from the foreign matter removal system 3 to the outside of the ship. As shown in FIG. 3, the first residue pipe 12 is configured such that its inlet end is connected to the residue path branching valve 14 and branches from the residue discharge pipe 11B via the residue path branching valve 14. Although not particularly illustrated, the outlet end of the first residue pipe 12 communicates with the outside of the ship (ocean, etc.). The first residue pipe 12 receives residue from the residue discharge pipe 11B via the residue path branch valve 14, and distributes the received residue to the outside of the ship. The residue can be discharged overboard (dumped into the ocean) through the first residue pipe 12.

The second residue pipe 13 is a pipe that constitutes a discharge path for discharging the residue from the foreign matter removal system 3 to the sludge tank 15 inside the ship. As shown in FIG. 3, the second residue pipe 13 has an inlet end connected to the residue path branching valve 14 and an outlet end connected to the sludge tank 15. That is, the second residue pipe 13 branches from the residue discharge pipe 11B via the residue path branching valve 14 and communicates with the sludge tank 15. The second residue pipe 13 receives residue from the residue discharge pipe 11B via the residue path branch valve 14, and discharges the received residue to the sludge tank 15.

The residue path branch valve 14 is for distributing the residue discharged from the foreign matter removal system 3 through the residue discharge pipe 11B to a first residue pipe 12 leading to the outside of the ship or a second residue pipe 13 leading to a sludge tank 15 inside the ship. It is a valve. As shown in FIG. 3, the residue path branching valve 14 is constituted by a three-way valve or the like, and branches the residue discharge pipe 11B into a first residue pipe 12 and a second residue pipe 13. That is, among the three openings that the residue path branching valve 14 has, the outlet end of the residue discharge pipe 11B is connected to the first opening, and the inlet end of the first residue pipe 12 is connected to the second opening. The inlet end of the second residue pipe 13 is connected to the third opening. The residue path branch valve 14 controls one of the opening degrees between the residue discharge pipe 11B and the first residue pipe 12 and the opening degree between the residue discharge pipe 11B and the second residue pipe 13. Each of these opening degrees is adjusted by, for example, decreasing the other opening degree as the opening degree increases. In the second embodiment, the residue path branching valve 14 adjusts one of these opening degrees to fully open, and then adjusts the other opening degree to fully closed. For example, this opening degree adjustment is controlled by the control device 19A, and based on this control, the residue path branching valve 14 selectively connects the residue discharge pipe 11B with the first residue pipe 12 or the second residue pipe 13. . Such a residue path branching valve 14 connects the residue discharge pipe 11B and the first residue pipe 12 when the marine internal combustion engine 110 is operating on alternative fuel, and when the marine internal combustion engine 110 is operating on fossil fuel. If so, the residue discharge pipe 11B and the second residue pipe 13 are communicated with each other.

The control device 19A controls each flow of scrubber water and residue in the water treatment device 10A. Specifically, the control device 19A includes a CPU, a memory, a sequencer, etc. for executing various programs. When controlling the flow of residue, the control device 19A receives an electrical signal from the marine internal combustion engine 110, and controls the above-mentioned residue path branching valve 14 based on the received electrical signal. In addition, when controlling the flow of scrubber water, the control device 19A controls the branch valve 5 and the drain branch valve 9, respectively, similarly to the control device 19 in the first embodiment described above.

For example, the control device 19A determines whether the operation mode of the marine internal combustion engine 110 is an alternative fuel operation or a fossil fuel operation, based on the electrical signal received from the marine internal combustion engine 110. In the case of alternative fuel operation, the control device 19A controls the opening degree of the residue path branching valve 14 so that the residue discharge pipe 11B and the first residue pipe 12 are communicated with each other. Thereby, the control device 19A controls the flow of the residue so that the residue from the foreign matter removal system 3 is discharged overboard. In the case of fossil fuel operation, the control device 19A controls the opening degree of the residue path branching valve 14 so that the residue discharge pipe 11B and the second residue pipe 13 are communicated with each other. Thereby, the control device 19A controls the flow of the residue so that the residue from the foreign matter removal system 3 is discharged to the sludge tank 15 inside the ship.

Next, a procedure for controlling the flow of residue by the water treatment device 10A will be explained. FIG. 4 is a flow diagram illustrating one control procedure for the flow of residue by the water treatment apparatus according to Embodiment 2 of the present invention. In the water treatment apparatus 10A (see FIG. 3) according to the second embodiment, the control device 19A controls the flow of the residue to be discharged by performing each process of steps S201 to S203 shown in FIG.

Specifically, in controlling the flow of residue by the water treatment device 10A, as shown in FIG. 4, the control device 19A first determines the operating mode (engine operating mode) of the marine internal combustion engine 110 (step S201). In step S201, the control device 19A determines whether the engine operation mode is the alternative fuel operation mode or the fossil fuel operation mode, based on the electrical signal from the marine internal combustion engine 110, as in step S103 (see FIG. 2) in the first embodiment described above. Determine which mode it is in.

If it is determined that the engine operation mode is the alternative fuel operation mode (step S201, alternative fuel), the control device 19A controls the opening degree of the residue path branching valve 14 to open the first residue pipe 12 (step S202 ). After that, the control device 19A returns to step S201 described above and repeats the processing from step S201 onward.

In step S202, the control device 19A controls the opening degree of the residue path branching valve 14 so that the first residue pipe 12 side of the residue path branching valve 14 is fully opened and the second residue pipe 13 side is fully closed. . Based on this opening degree control, the residue path branching valve 14 selectively switches the destination of the residue from the residue discharge pipe 11B from the second residue pipe 13 side to the first residue pipe 12 side. That is, the residue path branching valve 14 blocks communication between the residue discharge pipe 11B and the second residue pipe 13, and allows the residue discharge pipe 11B and the first residue pipe 12 to communicate with each other. The control device 19A controls the opening degree of the residue path branch valve 14 so that the residue in the alternative fuel operation mode is discharged (dumped into the ocean) overboard through the residue discharge pipe 11B and the first residue pipe 12. control the flow of

Here, when the engine operation mode is the alternative fuel operation mode, the residue separated and removed from the scrubber water after being used for cleaning exhaust gas contains foreign substances containing carbon components, as in the case of the scrubber wastewater described above. Not included. In this way, residues that do not contain foreign substances containing carbon components can be dumped into the ocean due to emission regulations.

On the other hand, in step S201 described above, if it is determined that the engine operation mode is the fossil fuel operation mode (step S201, fossil fuel), the control device 19A controls the residue path branching valve 14 to open the second residue pipe 13. The opening degree is controlled (step S203). After that, the control device 19A returns to step S201 described above and repeats the processing from step S201 onwards.

In step S203, the control device 19A controls the opening degree of the residue path branching valve 14 so that the first residue pipe 12 side of the residue path branching valve 14 is fully closed and the second residue pipe 13 side is fully open. . Based on this opening degree control, the residue path branching valve 14 selectively switches the destination of the residue from the residue discharge pipe 11B from the first residue pipe 12 side to the second residue pipe 13 side. That is, the residue path branching valve 14 blocks communication between the residue discharge pipe 11B and the first residue pipe 12, and allows the residue discharge pipe 11B and the second residue pipe 13 to communicate with each other. The control device 19A controls the opening of the residue path branch valve 14 so that the residue during the fossil fuel operation mode is discharged to the sludge tank 15 inside the ship through the residue discharge pipe 11B and the second residue pipe 13. Control the flow.

Here, when the engine operation mode is the fossil fuel operation mode, the residue separated and removed from the scrubber water after being used for cleaning exhaust gas contains foreign substances containing carbon components, as in the case of the scrubber wastewater described above. included. In this way, the residue containing foreign substances containing carbon components is not dumped into the ocean, but is temporarily stored in the sludge tank 15 and disposed of after landing.

Note that the control device 19A controls the flow of scrubber water in parallel to controlling the flow of the residue described above. The procedure for controlling the flow of scrubber water by the control device 19A is similar to steps S101 to S106 (see FIG. 2) in the first embodiment described above.

As described above, the water treatment device 10A according to the second embodiment of the present invention includes the residue discharge pipe 11B for discharging the residue from the foreign matter removal system 3, and the first residue pipe 11B for discharging the residue to the outside of the ship. The pipe 12, the second residue pipe 13 for discharging the residue to a storage tank inside the ship, and the residue discharge pipe 11B are branched into the first residue pipe 12 and the second residue pipe 13, and the residue discharge pipe 11B and the first A residue path branching valve 14 that selectively communicates with the residue pipe 12 or the second residue pipe 13 is provided, and other components similar to those of the first embodiment are provided. In this water treatment device 10A, the residue path branching valve 14 allows the residue discharge pipe 11B and the first residue pipe 12 to communicate with each other when the marine internal combustion engine 110 is operating on an alternative fuel. When fossil fuel operation is performed, the residue discharge pipe 11B and the second residue pipe 13 are communicated with each other.

With the above configuration, the same effects as those of the first embodiment described above are enjoyed, and the residue discharge path is connected to the outside of the vessel according to the operation mode (alternative fuel operation mode or fossil fuel operation mode) of the marine internal combustion engine 110. It is possible to switch between a discharge route for discharging to the ocean (dumping into the ocean) and a discharge route for discharging (storage) into a storage tank onboard a ship. Therefore, in addition to the above-mentioned scrubber waste water, it is possible to select whether or not to discharge the residue separated and removed from the scrubber water after cleaning the exhaust gas to the outside of the ship. Specifically, in alternative fuel operation mode, scrubber wastewater and residues that do not contain foreign substances containing carbon components do not need to be stored in onboard storage tanks and can be dumped into the ocean, while in fossil fuel operation mode, scrubber wastewater and residue that do not contain foreign substances containing carbon components Scrubber wastewater and residue containing foreign substances can be stored in onboard storage tanks without being dumped into the ocean.

In addition, in the above-mentioned Embodiments 1 and 2, each opening control of the branch valve 5 and the drain branch valve 9 was automatically performed by the control devices 19 and 19A, but the present invention is not limited to this. do not have. For example, the opening degree control of the branch valve 5 and the drain branch valve 9 may be manually controlled by an operator.

Further, in the second embodiment described above, the opening degree of the residue path branching valve 14 was automatically controlled by the control device 19A, but the present invention is not limited to this. For example, the opening degree control of the residue path branching valve 14 may be manually controlled by an operator's operation.

Furthermore, in the first and second embodiments described above, when discharging scrubber waste water from the foreign matter removal system 3, the scrubber drain pipe side of the branch valve 5 was fully opened and the merging pipe side (circulation system side) was fully closed. The present invention is not limited to this. For example, when discharging scrubber waste water from the foreign matter removal system 3, both the scrubber drain pipe side and the merging pipe side of the branch valve 5 may be opened (intermediate opening degree).

Further, in the first and second embodiments described above, the specific gravity of the scrubber water in the pipes (branch pipe 31, etc.) on the inlet side of the centrifuge 34 was measured by the hydrometer 4, but the present invention is limited to this. It is not something that will be done. For example, the specific gravity of the scrubber water may be measured using the hydrometer 4 in a pipe on the outlet side of the centrifugal separator 34 (e.g., the outlet pipe 32). Alternatively, the specific gravity of the scrubber water using the hydrometer 4 may be measured in a distribution path of the scrubber water other than the foreign matter removal system, such as the circulation pipe 21, the recovery pipe 104, or the collecting tank 1.

Further, in the first and second embodiments described above, the second drain pipe 8, the residue discharge pipes 11, 11B, and the second residue pipe 13 were connected separately to the sludge tank 15, but the present invention , but is not limited to this. For example, the second drain pipe 8 and the residue discharge pipes 11 and 11B may be merged and connected to the sludge tank 15, or the second drain pipe 8 and the second residue pipe 13 may be merged and connected to the sludge tank 15. May be connected.

Furthermore, in the first and second embodiments described above, the scrubber 101 of the EGR system 100 is illustrated as an example of a scrubber to which the water treatment apparatus according to the present invention is applied, but the present invention is not limited thereto. For example, the water treatment device according to the present invention may be applied to an exhaust gas cleaning device (scrubber) other than an EGR system.

Furthermore, in the first and second embodiments described above, the centrifugal separator 34 was used as an example of a device that separates scrubber water into residue and scrubber waste water and removes foreign matter, but the present invention is not limited to this. . For example, a device that separates scrubber water into residue and scrubber wastewater to remove foreign matter may be one that removes foreign matter from the scrubber water by using the difference in specific gravity between the scrubber water and the foreign matter, or a device that removes foreign matter from the scrubber water by using the difference in specific gravity between the scrubber water and the foreign matter. It may also be a device (for example, a filtration device) that removes foreign matter from the scrubber water without using the difference in specific gravity between the scrubber water and the foreign matter. That is, in the present invention, the type of the device is not particularly limited.

Furthermore, in the first and second embodiments described above, the opening degrees of the branch valve 5 and the drain branch valve 9 are each controlled by one control device (the control device 19 in the first embodiment or the control device 19A in the second embodiment). However, the present invention is not limited thereto. For example, the opening degree of the branch valve 5 may be controlled according to the specific gravity of the scrubber water by a control device (not shown) that is different from the above-mentioned control devices 19 and 19A. In this case, the control devices 19 and 19A control each processing procedure of steps S103 to S105 among steps S101 to S106 shown in FIG. Each processing procedure) may be repeatedly executed as appropriate.

Further, the present invention is not limited to the first and second embodiments described above. The present invention also includes configurations in which the above-mentioned components are appropriately combined. In addition, all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on the first and second embodiments described above are included in the scope of the present invention.

1 Collecting tank 2 Circulation system 3 Foreign matter removal system 4 Hydrometer 5 Branch valve 6 Scrubber drain pipe 7 First drain pipe 8 Second drain pipe 9 Drain branch valve 10, 10A Water treatment device 11, 11B Residue discharge pipe 12 No. 1 residue pipe 13 2nd residue pipe 14 residue path branch valve 15 sludge tank 16 fresh water supply section 17 pH adjustment section 18 level detection section 19, 19A control device 21 circulation pipe 22 circulation pump 31 branch pipe 32 outlet pipe 33 confluence pipe 34 centrifugation Separator 100 EGR system 101 Scrubber 101a Injection part 102 Demister 103 EGR blower 104 Recovery pipe 105 Pump 110 Marine internal combustion engine Ls Liquid level

Claims (4)

A water treatment device that is used for cleaning exhaust gas discharged from a marine internal combustion engine and processes scrubber water containing foreign substances removed from the exhaust gas,
a foreign matter removal system that removes the foreign matter from the scrubber water by separating the scrubber water into a residue containing the foreign matter and scrubber wastewater containing less foreign matter than the residue;
a storage tank for storing the residue and the scrubber wastewater;
a scrubber drain pipe for discharging the scrubber wastewater from the foreign matter removal system;
a first drain pipe for discharging the scrubber waste water overboard;
a second drain pipe for discharging the scrubber wastewater to the storage tank;
a drain branching valve that branches the scrubber drain pipe into the first drain pipe and the second drain pipe, and selectively communicates the scrubber drain pipe with the first drain pipe or the second drain pipe; ,
Equipped with
When the marine internal combustion engine is performing alternative fuel operation in which at least decarbonized fuel is burned, the drain branch valve communicates the scrubber drain pipe with the first drain pipe, and the marine internal combustion engine burns fossil fuel. When operating using fossil fuels to burn, the drain branch valve communicates the scrubber drain pipe with the second drain pipe.
A water treatment device characterized by: a residue discharge pipe for discharging the residue from the foreign matter removal system;
a first residue pipe for discharging the residue overboard;
a second residue pipe for discharging the residue to the storage tank;
a residue path branching valve that branches the residue discharge pipe into the first residue pipe and the second residue pipe, and selectively communicates the residue discharge pipe with the first residue pipe or the second residue pipe; ,
Equipped with
When the marine internal combustion engine is performing the alternative fuel operation, the residue path branching valve communicates the residue discharge pipe and the first residue pipe, and when the marine internal combustion engine is performing the fossil fuel operation. , the residue path branch valve communicates the residue discharge pipe with the second residue pipe;
The water treatment device according to claim 1, characterized in that: determining whether the operating mode of the marine internal combustion engine is the alternative fuel operation or the fossil fuel operation, and in the case of the alternative fuel operation, communicating the scrubber drain pipe with the first drain pipe; A control device that controls the opening degree of the drain branch valve so that the scrubber drain pipe and the second drain pipe communicate with each other in the case of the fossil fuel operation. further comprising,
The water treatment device according to claim 1 or 2, characterized in that: determining whether the marine internal combustion engine is in an operating mode of the alternative fuel operation or the fossil fuel operation, and in the case of the alternative fuel operation, communicating the residue discharge pipe with the first residue pipe; A control device that controls the opening degree of the residue path branching valve so that, in the case of the fossil fuel operation, the opening degree of the residue path branching valve is controlled so as to communicate the residue discharge pipe and the second residue pipe. further comprising,
The water treatment device according to claim 2, characterized in that:

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