JP2017217611A - Ballast water processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ballast water processing device which can resolve clogging of a filter element.SOLUTION: In a ballast water processing device, a filter 2 which filters ballast water is disposed in a casing 1. The ballast water processing device includes a connection passage connecting an external part of the casing 1. An opening part 4a formed at a casing 1 interior side end part of the connection passage is located close to the filter 2 or contacts with the filter 2, and an area of the opening part 4a is configured to be smaller than a filter area of the filter 2. The ballast water processing device further includes: a chemical solution flow passage 51 which connects the connection passage with the other side of a primary side of the filter 2 or a secondary side of the filter 2 and allows the ballast water including a chemical solution for removing foreign objects to circulate therein; and control means which forms a chemical solution circulation passage 50 including the filter 2, the connection passage, and the chemical solution flow passage 51 and circulates the ballast water including the chemical solution by a pump 52.SELECTED DRAWING: Figure 1

Description

  This invention relates to the ballast water treatment apparatus which has arrange | positioned the cylindrical filter which filters the ballast water which flowed in the inside, and flows out to the exterior in a casing.

  A ship such as a tanker usually stores water called ballast water in a ballast tank in order to balance the ship in operation when navigating to a destination again after unloading crude oil or the like. Ballast water is basically taken at the loading port and discharged at the loading port, so if ballast water is discharged at the loading port in a different sea area from the loading port, plankton and other plankton contained in the ballast water Bacteria microorganisms will be released to the port, which may destroy the marine ecosystem. In order to prevent the destruction of the marine environment due to this ballast water, the International Maritime Organization (IMO) has concluded a ballast water management treaty, and as a standard for ballast water discharge, the microorganisms contained in the ballast water discharged out of the ship The content is regulated.

In this ballast water discharge standard, plankton of 50 μm or more is defined as less than 10 individuals / m ³ , plankton of 10-50 μm is defined as less than 10 individuals / ml according to the size of plankton. It is determined that E. coli is less than 250 cfu / 100 ml. For this reason, when the ballast water is stored in the ballast tank, it is required that the microorganisms in the ballast water be killed and detoxified.

  As means for killing microorganisms in the ballast water and detoxifying them, the ballast water is filtered by a ballast water treatment device in which a filter for filtering the ballast water is disposed in the casing, and the ultraviolet ray to the ballast water by the ultraviolet irradiation device. Processing methods combining irradiation are known. In the filter of the ballast water treatment device used in this treatment method, 99.99% removal performance is required for plankton of 50 μm or more, and therefore it is important to constantly wash the filter. .

  Therefore, as a ballast water treatment device that removes foreign matter accumulated on the filter, for example, Patent Document 1 includes a filter rotation unit that rotates the filter around its axis, and a filter primary unit that is provided on the primary side of the filter. A suction nozzle that opens toward the inner peripheral surface, a cleaning water ejection nozzle that is provided on the secondary side of the filter and that ejects cleaning water toward the filter, and discharges cleaning sewage sucked by the suction nozzle to the outside. What is provided with the washing | cleaning waste water discharge means is described.

International Publication No. 2015/068245

  However, depending on the storage situation after the operation of the ballast water treatment apparatus, the scale may adhere to the filter and the filter may be blocked.

  This invention is made | formed in view of such a situation, and it aims at providing the ballast water treatment apparatus which can remove the foreign material adhering to a filter, and can eliminate the obstruction | occlusion of a filter element.

  According to the present invention, there is provided a ballast water treatment apparatus in which a filter for filtering ballast water is disposed in a casing, the inlet for introducing ballast water before filtration to the primary side of the filter, and two filters. An outlet through which the ballast water filtered from the secondary side flows out, a connection path that is provided on either the primary side of the filter or the secondary side of the filter and connects the inside of the casing and the outside of the casing; An opening formed at an end of the connection path inside the casing is close to or in contact with the filter, and an area of the opening is larger than a filtration area of the filter It is configured to be small, and includes a chemical solution for connecting the connection path to either the primary side of the filter or the secondary side of the filter and for removing foreign substances. Forming a chemical liquid circulation path including a chemical liquid flow path for circulating ballast water, a pump provided in the chemical liquid flow path, the ballast water filling the casing, and the filter, the connection path, and the chemical liquid flow path; There is provided a ballast water treatment apparatus, further comprising a control means for circulating ballast water containing the chemical liquid by the pump.

  According to such a configuration, the chemical solution circulating means for circulating the chemical solution for removing the foreign matter is provided, the chemical solution circulates through the opening that opens toward the filter and has an area smaller than the filtration area of the filter. The flow rate of the chemical solution passing through the filter is increased, and foreign substances attached to the filter can be effectively removed.

  Hereinafter, various embodiments of the present invention will be exemplified. The following embodiments can be combined with each other.

  Preferably, the pump circulates ballast water containing the chemical liquid in a direction to flow into the connection path from the opening, and the chemical flow path is connected to an end of the connection path outside the casing and the flow path. It connects the exit.

  Preferably, the connection path includes a suction nozzle provided on a primary side of the filter, and a discharge unit that is connected to the suction nozzle and discharges the ballast water including the chemical liquid flowing from the suction nozzle to the outside of the casing. A washing water jet nozzle provided on the secondary side of the filter and jetting washing water toward the filter, and being filtered by the washing water jet nozzle, the suction nozzle and the discharge means A structure for back cleaning for cleaning the filter is formed.

  Preferably, a differential pressure detection unit that detects a differential pressure between the primary side and the secondary side of the filter during the filtration process is provided, and the control unit is configured to circulate the chemical solution based on the differential pressure detected by the differential pressure detection unit. The operation of circulating the ballast water containing the chemical solution in the path is controlled.

  Preferably, a chemical solution introduction unit that introduces the chemical solution into the chemical solution circulation path and a neutralizer introduction unit that introduces a neutralizing agent that neutralizes the chemical solution into the chemical solution circulation path are provided.

  Preferably, the filter is formed in a cylindrical shape, and has an inner side as a primary side and an outer side as a secondary side, and includes a filter rotating unit that rotates the filter around its axis, and the control unit includes The ballast water containing the chemical solution is circulated while rotating the filter rotating means.

  According to the present invention, there is also provided a filter cleaning method for a ballast water treatment apparatus in which a filter for filtering ballast water is disposed in a casing, wherein the ballast water treatment apparatus includes a primary side of the filter and a second filter. A connecting path that is provided on any one of the following sides and connects the inside of the casing and the outside of the casing, and an opening formed at an end of the connecting path on the casing inner side is close to the filter, or The filter is in contact with the filter, and the area of the opening is configured to be smaller than the filtration area of the filter. The casing is filled with ballast water, and the end of the connection path outside the casing The chemical solution is introduced into a circulation path formed by connecting either the primary side of the filter or the secondary side of the filter to the circulation side. Circulating ballast water containing chemical, filter washing method of the ballast water treatment system is provided.

  Preferably, a step of detecting a differential pressure between the primary side and the secondary side of the filter, a step of stopping the filtration process when the detected differential pressure exceeds a predetermined value, and an outside of the casing of the connection path A step of connecting the other end of the filter to the primary side of the filter and the other side of the secondary side of the filter by a chemical flow passage; and introducing a chemical into the chemical flow passage, provided in the chemical flow passage Circulating ballast water containing the chemical solution by a pump.

It is explanatory drawing which shows schematic structure of the ballast water treatment apparatus which concerns on embodiment of this invention. It is explanatory drawing which expand | deploys and shows the cylindrical filter (element) of the ballast water treatment apparatus of FIG. It is a flowchart which shows the washing | cleaning control of the filter of the ballast water treatment apparatus of FIG.

  Hereinafter, embodiments of the present invention will be described. Various characteristic items shown in the following embodiments can be combined with each other. The invention is established independently for each feature.

<Overall configuration of ballast water treatment device>
The ballast water treatment apparatus according to the present embodiment includes a cylindrical casing 1 and a cylindrical filter 2 that is disposed in the casing 1 and filters the ballast water before filtration such as seawater that flows into the casing 1 to flow out. And filter rotating means 3 for rotating the filter 2 around its axis.

  Further, in order to clean the filter 2 during the filtration process (hereinafter referred to as reverse cleaning), a plurality of suction nozzles 4 provided on the primary side of the filter 2 and opening toward the inner peripheral surface of the filter 2, A cleaning water jet nozzle 6 that is provided on the secondary side and jets cleaning water toward the filter 2, a cleaning water supply means 7 that supplies the cleaning water to the cleaning water jet nozzle 6 under pressure, and a suction nozzle 4 sucks the cleaning water. Discharging means 5 for discharging the washed sewage from the casing 1 to the outside. In the present embodiment, the connection path defined in the claims is formed from the suction nozzle 4 and the discharge means 5. Further, for cleaning the filter 2 with high-pressure fluid after draining the water in the casing 1 (hereinafter referred to as space cleaning), it is provided on the secondary side of the filter 2 and opens toward the outer peripheral surface 2 a of the filter 2. And a high-pressure fluid ejection nozzle 40 that ejects a high-pressure fluid toward the filter 2, and a high-pressure fluid supply means 41 that supplies the high-pressure fluid to the high-pressure fluid ejection nozzle 40.

  Here, in the present specification, “ballast water” is used either before being introduced (inflow) into the ballast tank (not shown) or after being discharged (outflow) from the ballast tank. Regardless of whether it is introduced (inflowed) or discharged (outflowed) from the ballast water treatment device, it is further discharged before being introduced (inflowed) into the ultraviolet irradiation device or the like (not shown) or from the ultraviolet irradiation device or the like. Regardless of (spilled out), all the water taken into the ship is expressed as “ballast water”, which includes seawater, fresh water, brackish water, and the like.

  In addition, the ballast water treatment apparatus of the present embodiment includes a chemical solution circulation means 50 for circulating the chemical solution for cleaning with a chemical solution for removing the scale attached to the filter 2 (hereinafter referred to as chemical solution cleaning). . Here, in the present embodiment, the chemical liquid circulation means 50 includes a chemical liquid flow passage 51 and a circulation pump 52. In addition, in this application, a scale means deposits, such as calcium and magnesium.

  In addition, the ballast water treatment apparatus of the present embodiment controls the filtration by the filter 2 and the cleaning process of the filter 2 having the above-described configuration, so that the differential pressure detection means that detects the differential pressure between the primary side and the secondary side of the filter 2. 8 and a control means 9 for controlling the operations of reverse cleaning, space cleaning, and chemical cleaning based on the differential pressure detected by the differential pressure detection means 8. Each configuration will be specifically described below.

<Filter configuration>
The casing 1 is formed in a cylindrical shape, and an upper opening is sealed with a lid 10 and a lower opening is sealed with a bottom 11. The lid portion 10 is provided with an air vent valve 12 that vents air in the casing 1. The cylindrical filter 2 disposed in the casing 1 has an upper opening sealed with an upper closing portion 13 and a lower opening closed with a lower closing portion 14 and a lower rotating shaft member 16 described later. With these configurations, the inside of the filter 2 is formed between the casing 1 and the filter 2 and separated from the outflow space 27 side through which the ballast water after passing through the filter 2 flows out. The filter 2 preferably has a structure in which a filter body such as a metal mesh formed in a cylindrical shape is sandwiched between a support body formed in a cylindrical shape with two thin metal plates provided with a large number of holes. The structure which provided the filter body in the outer peripheral surface of the support body which formed the metal thin plate which provided this in the cylindrical shape may be sufficient.

  The filter rotating means 3 for rotating the filter 2 includes an upper rotating shaft member 15 provided on the upper closing portion 13 and the lower closing portion 14 of the filter 2 so as to project in the axial direction at the axial center position of the filter 2 and the lower rotating portion. The shaft member 16 and the motor 17 that rotates the upper rotating shaft member 15 are configured. The upper rotary shaft member 15 passes through the lid portion 10 of the casing 1 and is rotatably and liquid-tightly supported by the lid portion 10 via a sealed bearing member 18. The lower rotary shaft member 16 is supported by the bottom portion 11 of the casing 1. And is supported rotatably and liquid tightly on the bottom 11 through a sealed bearing member 19. The lower rotary shaft member 16 is a tubular body communicating with the inside of the filter 2, and ballast water before filtration is introduced into the filter 2 from the bottom 11 of the casing 1 to the lower rotary shaft member 16 protruding outside the casing 1. An inlet 20 is connected. An introduction path 21 is connected to the introduction port 20. The introduction path 21 is provided with a pump 22 that pumps the ballast water before the filtration treatment, and an on-off valve 23 that is located on the downstream side of the pump 22. The introduction path 21 on the downstream side of the on-off valve 23 includes a drainage path. 24 is connected, and an open / close valve 25 is provided in the drainage channel 24. An outlet 26 through which the ballast water after filtration that has passed through the filter 2 flows out is provided on the side of the casing 1, and the ballast water introduced through the introduction passage 21 through the introduction passage 21 is provided on the lower rotary shaft member 16. And enters the filter 2, passes through the filter 2, is filtered, enters an outflow space 27 formed between the casing 1 and the filter 2, and flows out from the outflow port 26. The filtered ballast water flowing out from the outlet 26 passes through the outflow water channel 32 and is stored in a ballast tank (not shown). An open / close valve 44 is also provided in the outflow water channel 32.

<Configuration for reverse cleaning>
The discharge means 5 is connected to a plurality of suction nozzles 4, a collecting pipe 28 for collecting ballast water sucked by the suction nozzles 4, and a discharge pipe 29 connected to the collecting pipe 28 for discharging the collected ballast water to the outside. And an on-off valve 30 provided in the discharge pipe 29. The collecting pipe 28 is disposed at the axial center of the filter 2, has an upper end closed and a lower end opened, and the upper end has a bearing member 31 in a hole provided at the center of the upper closing part 13 of the filter 2. Through which it can rotate freely. Further, the lower end portion of the collecting pipe 28 passes through the lower rotary shaft member 16 of the lower closing portion 14 of the filter 2 so as not to prevent the rotation of the filter 2 and is fixed and supported by the introduction port 20 of the casing 1. . A discharge pipe 29 for discharging the sucked ballast water to the outside is connected to the lower end portion of the collecting pipe 28. The discharge pipe 29 is provided with an on-off valve 30 that is always open during the filtration operation.

  The suction nozzles 4 are pipes extending from the collecting pipe 28 toward the filter 2. In this embodiment, a total of 12 suction nozzles 4, each having four rows at 90 ° intervals in the circumferential direction and three in the vertical direction, respectively. (In FIG. 1, the ones other than those extending in the right direction are omitted). And in order to eliminate the non-suction part between the suction nozzles 4 arranged above and below, the height direction of each row is such that the suction nozzles 4 in the other row are located between the suction nozzles 4 in one row. The positions of are shifted. The tip of each suction nozzle 4 is a substantially rectangular opening 4a that opens toward the inner peripheral surface 2b of the filter 2, and the opening 4a is close to the inner peripheral surface of the filter 2 or is slid. It is in close contact with movement. With such a configuration, the area of the opening 4 a of the suction nozzle 4 of the present embodiment is smaller than the filtration area of the filter 2. That is, as shown in the explanatory view in which the cylindrical filter 2 in FIG. 2 is developed, the total area of the openings 4 a of the 12 suction nozzles 4 is smaller than the area of the entire filter 2. Here, the total area of the openings 4a is preferably 1/10 or less of the filtration area of the filter 2, more preferably 1/50 or less, and more preferably 1/100 or less. Preferably, it is set to 1/200, more preferably set to 1/400. The configuration of the suction nozzle 4 is not particularly limited, but it is preferable that the suction nozzle 4 can suck from the entire axial direction of the filter 2. As another example of arranging the suction nozzles 4 in the axial direction of the filter 2, a plurality of suction nozzles 4 are arranged in a spiral shape in the axial direction of the filter 2 at intervals at which no non-suction part remains between the suction nozzles 4. Can be considered. With such a configuration, since the filter 2 being filtered is rotated by the filter rotating means 3, the openings 4a sequentially approach the entire filter 2 as the filter 2 rotates.

  The washing water jet nozzle 6 is provided on a side portion of the casing 1 and opens in the casing 1. The washing water jet nozzle 6 is preferably capable of jetting washing water over the entire axial direction of the filter 2, but its configuration is not particularly limited. For example, a plurality of cleaning water jet nozzles 6 can be arranged in a linear shape in the axial direction of the filter 2 and / or at different angles in the circumferential direction. The plurality of cleaning water jet nozzles 6 arranged at different angles in the circumferential direction may be arranged at the same height or may be arranged at different heights. In the present embodiment, the washing water ejection nozzle 6 is positioned on the same circumference as each of the plurality of suction nozzles 4 arranged, and is positioned in front of the suction nozzle 4 in a direction facing the rotation direction of the filter 2. However, it may be provided at each position facing each suction nozzle 4 or may be located behind the suction nozzle 4 in a direction facing the rotation direction of the filter 2. May be provided.

  In this embodiment, the cleaning water supply means 7 that pressurizes and supplies the cleaning water to the cleaning water jet nozzle 6 uses ballast water treated by the filter 2 as the cleaning water, and is connected to the outlet 26 of the filter 2. One end of the cleaning water supply path 33 is connected to the middle of the outflow water path 32, the other end of the cleaning water supply path 33 is connected to each cleaning water jet nozzle 6, and the ballast water treated by the filter 2 is supplied to the cleaning water supply path. The cleaning water jet nozzles 6 are supplied to the cleaning water jet nozzles 33. The cleaning water supply passage 33 is provided with a pump 34 that pumps ballast water to each cleaning water jet nozzle 6, and an open / close valve 35 on the upstream side of the pump 34. In the present embodiment, the pressure gauge 36 is provided on the downstream side of the pump 34, but this is not always necessary. In this embodiment, ballast water treated with the filter 2 is used as cleaning water. However, water stored in the ballast tank, domestic water and drinking water stored for other purposes. Etc. may be used as washing water.

<Configuration for space cleaning>
The high-pressure fluid ejection nozzle 40 is preferably capable of ejection over the entire axial direction in order to remove foreign matter from the entire filter 2, but the configuration thereof is not particularly limited. For example, a plurality of high-pressure fluid ejection nozzles 40 can be arranged linearly in the axial direction of the filter 2 and / or at different angles in the circumferential direction. A plurality of high-pressure fluid ejection nozzles 40 that are arranged at different angles in the circumferential direction may be arranged at the same height or at different heights.

  In this embodiment, clean water is used as the high-pressure fluid supplied to the high-pressure fluid ejection nozzle 40. As clean water, the ballast water processed by the filter 2, the water stored in the ballast tank, the water for domestic use, the drinking water etc. which are stored for the purpose of using for another use are used. In the high-pressure fluid supply means 41 for supplying clean water to be a high-pressure fluid, the tank 39 and the high-pressure fluid ejection nozzle 40 are connected by a clean water supply passage 42, and the clean water stored in the tank 39 is pumped by the pumps 43. The high pressure fluid jet nozzle 40 is pumped. In this embodiment, clean water is used as the high-pressure fluid supplied to the high-pressure fluid ejection nozzle 40, but the high-pressure fluid may be high-pressure air. In this case, the high-pressure fluid supply means 41 supplies high-pressure air to the high-pressure fluid ejection nozzle 40 by an air compressor (not shown). The high pressure fluid may be water vapor.

<Configuration for chemical cleaning>
The chemical solution circulation means 50 circulates the chemical solution for removing the scale adhering to the filter 2, so that the flow of ballast water treated by the discharge pipe 29 of the discharge means 5 and the filter 2 for discharging the sucked ballast water to the outside. The outlet 26 is connected by a chemical flow passage 51 which is a pipe line. That is, in the present embodiment, the chemical liquid flows into the casing 1 from the outlet 26 by the circulation pump 52 and circulates in the direction of flowing out of the casing 1 from the discharge pipe 29 via the suction nozzle 4. The chemical solution circulation means 50 also includes a chemical solution introduction means 53 for introducing a chemical solution into the chemical solution flow passage 51 and a neutralizer introduction means 54 for introducing a neutralizing agent for neutralizing the chemical solution into the chemical solution flow passage 51.

<Control means>
The control means 9 controls the operations of reverse cleaning, space cleaning, and chemical cleaning based on the pressure difference between the primary side and the secondary side of the filter 2 detected by the differential pressure detection means 8. The differential pressure detecting means 8 detects the pressure on the primary side and the secondary side of the filter 2 at the time of the filtration process with the pressure sensors 37 and 38 provided in the filter 2 and the outflow space 27, and The differential pressure on the secondary side is detected. The differential pressure between the primary side and the secondary side of the filter 2 can determine how dirty the filter 2 is. When the differential pressure is large, it indicates that the amount of foreign matter accumulated on the filter 2 is large. When the differential pressure is small Indicates that the filter 2 is in a state close to the initial state.

<Each filter cleaning operation>
Next, individual operations of reverse cleaning, space cleaning, and chemical cleaning performed in this embodiment will be described.
<Reverse cleaning operation>
Back washing is performed during the ballast water filtration process. During normal filtration processing, the on-off valve 30 provided in the discharge pipe 29 is always open, and the pressure on the secondary side of the on-off valve 30 is released to atmospheric pressure. 2, the foreign matter adhering to the filter 2 is sucked together with the filtered ballast water on the secondary side of the filter 2, flows into the collecting pipe 28, and is discharged from the discharge pipe 29 to the outside. Is discharged. In addition, the control unit 9 performs control so that the cleaning water is ejected from the cleaning water ejection nozzle 6 when the differential pressure detected by the differential pressure detection unit 8 reaches a predetermined differential pressure P1. The predetermined pressure here is set as a predetermined pressure, which is a differential pressure at which it is determined that the amount of foreign matter accumulated on the filter 2 cannot be removed by the suction of the suction nozzle 4. At this time, the washing water ejection nozzle 6 is positioned on the same circumference as each of the plurality of suction nozzles 4 arranged, and is positioned in front of the suction nozzle 4 in a direction facing the rotation direction of the filter 2. Since the cleaning water is ejected to the entire outer peripheral surface of the filter 2 by one rotation of the filter 2, the foreign matter accumulated on the primary side of the filter 2 can be efficiently separated, and Since the suction by the suction nozzle 4 is performed immediately after the separation, the foreign matter separated from the filter 2 by the cleaning water ejected from the cleaning water ejection nozzle 6 is effectively sucked by the suction nozzle 4. In addition, you may perform control which adjusts the jet pressure of washing water according to differential pressure | voltage.

<Space cleaning operation>
The space cleaning is performed after draining the water in the casing 1. That is, during the ballast water treatment operation, when the differential pressure detected by the differential pressure detection means 8 reaches a predetermined differential pressure P2, the on-off valve 25 of the drainage channel 24 is opened, and the air vent provided in the lid portion 10 is opened. The valve 12 is opened, the water in the casing 1 is discharged, the clean water stored in the tank 39 is supplied to the high pressure fluid jet nozzle 40 by the high pressure fluid supply means 41, and the high pressure fluid is jetted while rotating the filter 2 for a predetermined time. Clean water is ejected from the nozzle 40 to the outer peripheral surface of the filter 2 as a high-pressure fluid. Further, the space cleaning can be performed while the ballast water treatment operation is stopped and the water in the casing 1 is discharged after the filtration treatment operation is completed, and the filter 2 is rotated.

<Chemical cleaning operation>
The chemical cleaning is performed when the filtration process by the filter 2 is stopped in a state in which the ballast water is in the casing 1. Specifically, when the differential pressure detected by the differential pressure detection means 8 reaches a predetermined differential pressure P3 during the ballast water treatment operation or before the start of the ballast water treatment operation, the control means 9 On the other hand, the on-off valve 23 provided on the side, the on-off valve 35 provided on the outflow water channel 32 side and the on-off valve 44 are closed, while the on-off valve 55 provided on the chemical liquid flow passage 51 is opened to open the introduction passage 21 and the outlet 26. To form a chemical circuit. Here, the chemical liquid circulation path includes the filter 2, the suction nozzle 4, the discharge means 5, and the chemical liquid flow path 51. Moreover, it is preferable that the chemical solution circulation path is a closed pipe line, but as long as the chemical solution can be circulated, the chemical solution circulation path may partially include a portion that circulates outside the chemical solution circulation path. Note that the filter 2 is rotated by the filter rotating means 3. And the control means 9 introduce | transduces a chemical | medical solution in the chemical | medical solution flow path 51 by the chemical | medical solution introduction means 53, flows in the ballast water containing the chemical | medical solution in a chemical | medical solution circulation path from the outflow port 26 in the casing 1 with the circulation pump 52, It is circulated in the direction of flowing out of the casing 1 from the discharge pipe 29 through the suction nozzle 4.

  With the above configuration, the chemical solution passes through the filter 2 from the secondary side to the primary side only from the portion where the opening 4a of the suction nozzle 4 is present. Here, in the present embodiment, as described above, the total area of the openings 4 a of the suction nozzle 4 is smaller than the area of the entire filter 2. Therefore, compared with the case where the chemical liquid does not pass through the suction nozzle 4 and flows through the entire filter 2 from the secondary side to the primary side, the flow velocity when passing through the filter 2 increases.

And after circulating a chemical | medical solution for the predetermined time, the neutralizing agent is introduce | transduced in the chemical | medical solution flow path 51 by the neutralizing agent introduction means 54, and a chemical | medical solution is neutralized so that a chemical | medical solution does not remain | survive.
<Overall operation of filter cleaning>

  Hereinafter, the cleaning method of the filter 2 that combines reverse cleaning, space cleaning, and chemical cleaning by the control of the control unit 9 according to the present embodiment will be described using the flowchart of FIG.

  First, the control means 9 starts the filtering process of the ballast water process, and determines whether the filtering process by the filter 2 is continued in step S1. If not continued, the process ends. When the filtration process is continued, in step S2, the differential pressure is detected by the differential pressure detecting means 8, and the detected differential pressure is compared with a predetermined differential pressure P1. If the differential pressure is smaller than the predetermined differential pressure P1, the process returns to step S1. If the differential pressure is greater than the predetermined differential pressure P1, it is determined that foreign matter has adhered to the filter 2, and reverse cleaning is performed in step S3.

  Next, after back washing, in step S4, the differential pressure is detected by the differential pressure detecting means 8, and the detected differential pressure is compared with a predetermined differential pressure P2. If the differential pressure is smaller than the predetermined differential pressure P2, it is determined that the foreign matter has been removed, and the process returns to step S1. If the differential pressure is greater than the predetermined differential pressure P1, it is determined that the foreign matter adhering to the filter 2 has not been removed, and space cleaning is performed in step S5. When performing space cleaning, as described above, the water in the casing 1 is discharged, and then the high-pressure fluid is ejected to the filter 2.

  Next, after the space cleaning, in step S6, the casing 1 is again filled with ballast water, the differential pressure is detected by the differential pressure detecting means 8, and the detected differential pressure is compared with a predetermined differential pressure P3. . If the differential pressure is smaller than the predetermined differential pressure P3, it is determined that the foreign matter has been removed, and the process returns to step S1. If the differential pressure is greater than the predetermined differential pressure P3, it is determined that the foreign matter attached to the filter 2, particularly the scale, has not been removed, and chemical cleaning is performed in step S7.

  Then, after the chemical cleaning, in step S8, the differential pressure is detected by the differential pressure detecting means 8, and the detected differential pressure is compared with a predetermined differential pressure P4. If the differential pressure is smaller than the predetermined differential pressure P4, it is determined that the foreign matter (scale) has been removed, and the process returns to step S1. If the differential pressure is greater than the predetermined differential pressure P4, a warning is issued in step S9 that foreign matter cannot be removed by the filter cleaning method and the ballast water filtration process cannot be continued, and the process ends.

  Note that the predetermined differential pressures P1, P2, and P3 that trigger the start of each of the reverse cleaning, the space cleaning, and the chemical cleaning, and the differential pressure P4 that is determined when the foreign matter cannot be removed may all be the same pressure. , P1 may be set to increase in the order of P4.

<Effect>
(1) Since the chemical solution circulation means 50 for circulating the chemical solution for removing the scale is provided, the scale that cannot be removed by the back washing and the space washing can be removed, and the clogging of the filter can be eliminated. it can.
(2) Since the chemical solution circulates through the opening 4a of the suction nozzle 4 that opens toward the filter 2 and has a smaller area than the filtration area of the filter 2, the flow rate of the chemical solution that passes through the filter 2 increases, and the filter 2 can be effectively removed, and the chemical solution can be spread to the corners.
(3) By reducing the area of the opening 4a, the flow rate can be increased even when a low-capacity pump is used, and sufficient chemical cleaning can be performed in a short time.
(4) Since the chemical solution is circulated using the suction nozzle 4 and the discharge means 5 for the reverse cleaning, the circulation path can be shared and the increase in the number of parts can be suppressed.

In addition, this invention can be implemented also with the following aspects.
-Although the ballast water treatment apparatus of the above embodiment was controlled to perform underwater cleaning, space cleaning, and chemical cleaning in this order, these cleanings may be performed at independent timings, or performed in a different order. Also good.
In the above embodiment, each washing is determined based on the differential pressure between the primary side and the secondary side of the filter 2, but when the water quality reaches the predetermined water quality by providing the water quality measuring means, the time measuring means is provided. Control may be performed such that each cleaning is performed when the filtration processing time reaches a predetermined time, or when the number of operations counted by the counting means reaches a predetermined number.
The chemical liquid flow passage 51 and the circulation pump 52 may be detachable. In this case, the chemical solution flow passage 51 and the circulation pump 52 are attached periodically or at the timing of berthing at the port, and cleaning with the chemical solution is performed.
In the above embodiment, the opening 4a is provided on the primary side of the filter, but the opening may be provided on the secondary side of the filter. Moreover, it is also possible to make it the structure which circulates the ballast water containing a chemical | medical solution in the direction which goes to a filter from an opening part.
-Although the chemical | medical solution circulation means 50 in the said embodiment circulates the chemical | medical solution which removes a scale, you may use the chemical | medical solution circulation means of the said embodiment in order to circulate the chemical | medical solution for killing microorganisms. Also in this case, the chemical solution can be circulated at a high flow rate, and the chemical solution can be spread over the entire flow path in a short time.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation and change are possible within the range of the summary of invention.

DESCRIPTION OF SYMBOLS 1: Casing 2: Filter 2a: Outer peripheral surface 2b: Inner peripheral surface 3: Filter rotation means 4: Suction nozzle 4a: Opening part 5: Discharge means 6: Wash water ejection nozzle 7: Wash water supply means 8: Differential pressure detection means 9: Control means 10: Cover part 11: Bottom part 12: Air vent valve 13: Upper closing part 14: Lower closing part 15: Upper rotating shaft member 16: Lower rotating shaft member 17: Motors 18, 19: Bearing member 20: Introduction Mouth 21: Inlet path 22: Pump 23, 25, 30, 35, 44, 55: On-off valve 24: Drainage path 26: Outlet 27: Outlet space 28: Collecting pipe 29: Drain pipe 31: Bearing member 32: Outlet water path 33: Wash water supply path 34: Pump 36: Pressure gauges 37, 38: Pressure sensor 39: Tank 40: High pressure fluid ejection nozzle 41: High pressure fluid supply means 42: Clean water supply path 43: Pump 50: Medicine Circulation means 51: liquid medicine passage 52: circulation pump (pump)
53: Chemical solution introducing means 54: Neutralizing agent introducing means P1-P4: Differential pressure S1-S9: Step

Claims (8)

A ballast water treatment device in which a filter for filtering ballast water is disposed in a casing,
An inlet for introducing the ballast water before filtration to the primary side of the filter, an outlet for discharging the ballast water filtered from the secondary side of the filter, a primary side of the filter, and a secondary of the filter A connection path provided on any one of the sides and connecting the inside of the casing and the outside of the casing;
An opening formed at the end of the connection path inside the casing is close to or in contact with the filter, and the area of the opening is smaller than the filtration area of the filter. Configured,
A chemical solution flow path for connecting ballast water containing a chemical solution for connecting the other side of the primary side of the filter and the secondary side of the filter and removing foreign substances;
A pump provided in the chemical flow path;
Control means for filling the inside of the casing with ballast water and forming a chemical liquid circulation path including the filter, the connection path, and the chemical liquid flow path, and circulating the ballast water including the chemical liquid by the pump; Ballast water treatment equipment.   The pump circulates ballast water containing the chemical liquid in a direction to flow into the connection path from the opening, and the chemical flow path includes an end of the connection path outside the casing and the outlet. The ballast water treatment device according to claim 1, which is to be connected. The connection path includes a suction nozzle provided on a primary side of the filter, and a discharge unit that is connected to the suction nozzle and discharges ballast water containing the chemical liquid flowing from the suction nozzle to the outside of the casing. ,
A washing water jet nozzle provided on the secondary side of the filter and jetting washing water toward the filter;
The ballast water treatment device according to claim 2, wherein a structure for backwashing for washing the filter during a filtration operation is formed by the washing water ejection nozzle, the suction nozzle, and the discharge unit. A differential pressure detecting means for detecting a differential pressure between the primary side and the secondary side of the filter during the filtration process;
The said control means controls the operation | movement which circulates the ballast water containing the said chemical | medical solution to the said chemical | medical solution circulation path based on the differential pressure detected by the said differential pressure | voltage detection means. Ballast water treatment equipment.   5. The apparatus according to claim 1, further comprising: a chemical solution introduction unit that introduces the chemical solution into the chemical solution circulation path; and a neutralizing agent introduction unit that introduces a neutralizing agent that neutralizes the chemical solution into the chemical solution circulation path. The ballast water treatment device described in 1. The filter is formed in a cylindrical shape, and the inside is a primary side and the outside is a secondary side.
Comprising a filter rotating means for rotating the filter about its axis;
The ballast water treatment apparatus according to any one of claims 1 to 5, wherein the control means circulates ballast water containing the chemical liquid while rotating the filter rotating means. A filter cleaning method for a ballast water treatment device in which a filter for filtering ballast water is disposed in a casing,
The ballast water treatment apparatus includes a connection path that is provided on either the primary side of the filter or the secondary side of the filter and that connects the inside of the casing and the outside of the casing, and the casing has an inner side of the connection path. The opening formed at the end of the filter is close to or in contact with the filter, and the area of the opening is configured to be smaller than the filtration area of the filter,
A circulation path formed by filling the casing with ballast water and connecting an end of the connection path outside the casing to the primary side of the filter or the secondary side of the filter. A filter cleaning method for a ballast water treatment apparatus, wherein a chemical solution is introduced and ballast water containing the chemical solution is circulated in the circulation path. Detecting a differential pressure between the primary side and the secondary side of the filter;
Stopping the filtration process when the detected differential pressure exceeds a predetermined value;
A step of connecting an end of the connection path outside the casing and either the primary side of the filter or the secondary side of the filter by a chemical flow path;
The method for cleaning a filter of a ballast water treatment apparatus according to claim 7, further comprising: introducing a chemical solution into the chemical solution flow path and circulating the ballast water containing the chemical solution by a pump provided in the chemical solution flow path. .