JP2012025266A - Ship having ballast water tank system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ship that can receive seawater and fresh water within a water area where the ship floats and fresh water supplied from outside the water area, which serve as ballast water, from outside the ship and can discharge the water outside the ship.SOLUTION: In the system, ship water receiving ports 7L and 7R for receiving the fresh water supplied from outside the water area are communicated, via pipes and valves, with suction ports of ballast water delivery pumps 9L and 9R installed in the ship to receive, deliver and discharge, as the ballast water, the seawater and the fresh water within the water area where the ship floats, respectively. Further, the ship has a ballast water tank system in discharge ports of the ballast water delivery pumps communicating with the ship water receiving ports via pipes and valves, respectively.

Description

  The present invention relates to a ballast water tank system for a ship that injects ballast water for ships (hereinafter simply referred to as “ballast water”) to be loaded for stable navigation of the ship, and a ship having a ballast water tank system.

  Crude oil tankers, liquefied natural gas (LNG) tankers, ore carriers, etc. are loaded with ballast water in a ballast tank installed in the ship because the hull becomes lighter and stable navigation is not possible when there is little air cargo or loading capacity. The hull is made heavy and stable to ensure operability.

  As this ballast water, the seawater, lake water and river water in the water area where the ship floats is absorbed by the ballast water pump in the ship body from the intake port provided at the bottom of the ship body, and distributed to multiple ballast tanks in the ship To do. When loading a load, the ballast water in the ballast water tank is absorbed by the ballast water pump and discharged to the water area where the ship is floating.

  In recent years, fresh water transportation projects have been examined in which fresh water purified into a ballast water tank is injected as ballast water, and the fresh water is landed and used for irrigation water or the like without being discharged into the water area at a dry area port.

  As a fresh water transportation method for landing ballast water transported by ship at a port in a dry region and using it for irrigation water or the like, for example, a method of loading purified sewage treated water on a ship (Japanese Patent Application Laid-Open No. 2004-25040). No. Gazette) has been proposed.

  In addition, as a conventional ballast tank system, for example, seawater in the water area where the ship is floating, lake water or river water raw water is ballast water, and water is absorbed by a ballast water pump in the hull from a water intake provided at the bottom of the hull, A system (Japanese Patent Laid-Open No. 2006-729) that distributes water to a plurality of ballast tanks in a ship after purification through a purification device has been proposed.

Japanese Patent Laid-Open No. 2004-25040 JP 2006-729 A

  However, Patent Document 1 and Patent Document 2 do not disclose the detailed structure of the ballast tank system in the ship, loading / unloading crude oil, etc., purifying fresh water / seawater into the ballast tank, The structure for unloading purified freshwater / draining seawater in parallel has not been clarified. Therefore, sufficient measures have not been taken to reduce the time required for unloading and loading purified freshwater. Also, a structure for keeping the draft of the ship constant when unloading or loading crude oil or purified water is not disclosed. Therefore, there is no sufficient response for maintaining the airtight connection at the connecting port between the receiving port on the ship side and the receiving port on the port side, and safely unloading and loading crude oil and purified fresh water.

  An object of the present invention is to reduce the time required for unloading and loading purified fresh water in a ship equipped with a ballast water tank system, or to safely unload and load crude oil and purified fresh water.

  The above-described problems include a first ballast water tank, a first ballast water pump that performs water injection and drainage of the first ballast water tank, a second ballast water tank, and water injection and drainage of the first ballast water tank. A second ballast water pump and the second ballast so as to inject into the second ballast water tank when the first ballast water pump is controlled to inject into the first ballast water tank. And a control means for controlling the water pump.

  In addition, a receiving / distributing port for receiving or distributing purified fresh water, a ballast water pump for supplying pressurized liquid, a ballast water tank for loading ballast water, a water supply flow from the receiving / distributing port to the ballast water pump. And a control device capable of switching to a second water supply flow from the ballast water tank to the receiving water distribution port via the ballast water pump through the ballast water tank. Solved by.

  According to the present invention, it is possible to carry out parallel loading of loading / unloading of crude oil, etc., loading of fresh water / seawater into a ballast water tank, unloading of fresh water from a ballast tank / water discharge, and so on. The time required for unloading and loading can be reduced. In addition, since the draft of the ship can be kept constant when unloading or loading crude oil or purified water, it is possible to maintain an airtight connection at the connection between the water distribution port on the ship side and the port on the port side, and it is safe. Unload and load crude oil and purified freshwater.

The block diagram of the ballast water tank system of Example 1. FIG. The 1st water supply flow figure of the ballast water tank system of Example 1. FIG. The 2nd water supply flow figure of the ballast tank system of Example 1. FIG. The 3rd water supply flow figure of the ballast water tank system of Example 1. FIG. The 4th water supply flow figure of the ballast water tank system of Example 1. FIG. The 5th water supply flow figure of the ballast water tank system of Example 1. FIG. The 6th water supply flow figure of the ballast tank system of Example 1. FIG. The 7th water supply flow figure of the ballast tank system of Example 1. FIG. Explanatory drawing of the salt concentration measuring apparatus of the ballast water tank system of Example 1. FIG. The block diagram of the ballast water tank system of Example 2. FIG. The 1st water supply flow figure of the ballast water tank system of Example 2. FIG. The 2nd water supply flow figure of the ballast water tank system of Example 2. FIG. The 3rd water supply flow figure of the ballast water tank system of Example 2. FIG. The figure which shows the installation position of the receiving water distribution port in the ship of Example 1. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The ship ballast water tank system of Example 1 is demonstrated using FIG. In FIG. 1, the left half shows a port side ballast aquarium system, and the right half shows a starboard ballast aquarium system. As is clear from this, the ballast aquarium system of the present embodiment is a pair of left and right systems. In the following, among the pair of configurations, the configuration related to the port side is denoted by L after the reference numeral, and the configuration related to the starboard side Is followed by R. In addition, the description will focus on the ballast tank system on the port side, and the description on the starboard configuration and water supply flow common to the port side will be omitted.

  In FIG. 1, 1, 2, and 3 are ballast tanks disposed on both the port side and the starboard side of the hull, and store raw water such as seawater, lake water, river water, or treated water as ballast water. Reference numeral 7 denotes an intake / drain port provided at the bottom of the hull, from which seawater and raw water are introduced into the hull. Reference numeral 9 denotes a ballast water pump that pressurizes the liquid. Reference numeral 15 denotes a ballast water source water purification device that purifies raw water such as seawater, lake water, and river water into a predetermined ballast water management water quality. In addition, as the ballast water raw water purification apparatus 15, the thing of a magnetic separation system may be used, and the thing which adds a chemical | medical agent and disinfects the microorganisms in ballast water may be used. 43 is a receiving water distribution port communicating with the port side ballast water tanks 1L, 2L, 3L, and 44 is a receiving water distribution port communicating with the starboard side ballast water tanks 1R, 2R, 3R. Reference numerals 28, 29, and 30 denote air release ports provided in the respective ballast water tanks, and air enters and exits as the ballast water level rises and falls in the ballast water tanks. 80 is a cushion tank that relieves the pressure of ballast water. 11, 17, 19, 20, 22, 23, 25, 26, 45, 48, 50, 52, 55, 65, 66, 71, 76, 81, 91 are valves. Reference numerals 12, 21, 24, 27, 46, 47, 51, 53, 56, 72 and 90 are pipes for connecting the members. Reference numeral 100 denotes a control device that controls the operation of the ballast water pump 9 and the ballast water source water purification device 15 and the opening and closing of each valve. In order to control the ballast water pump 9, the ballast water raw water purification device 15, and the respective valves, the control device 100 and the respective components are connected by signal lines.

Although the right and left ballast tank systems are basically independent, the ballast water is received by the receiving port and intake port on both the starboard and port sides by appropriately opening and closing the valves 48 and 76. Water and water can be supplied and can be controlled as an integrated ballast tank system.
(1) Referring to FIG. 2, the flow of water supply when raw water such as seawater, lake water or river water (hereinafter referred to as “seawater etc.”) is purified and stored in the port side ballast tanks 1L, 2L, 3L. To do. Here, it is assumed that the valves 11L, 17L, 19L, 20L, 22L, 23L, 25L, and 26L are opened and the other valves are closed under the control of the control device 100.

  As shown in FIG. 2, first, seawater or the like is introduced from the intake / drain port 7L into the hull. Seawater or the like introduced into the hull passes through the pipe 12L and the valve 11L and reaches the water supply port of the ballast water pump 9L. Seawater or the like fed under pressure by the ballast water pump 9L passes through the valve 17L and reaches the ballast water source water purification device 15L. The purified seawater and the like are stored in the ballast water tank 1L through the valves 19L and 20L. When ballast water flows into the ballast water tank 1L, air flows out from the atmosphere opening port 28, and the atmospheric pressure in the ballast water tank 1L is kept constant. Similarly, seawater or the like that has passed through the valves 19L, 22L, and 23L is stored in the ballast water tank 2L, and seawater that has passed through the valves 19L, 22L, 25L, and 26L is stored in the ballast water tank 3L.

Here, the ballast water is stored in all the ballast tanks 1L, 2L, 3L on the port side. However, the control device 100 arbitrarily opens and closes 19L, 20L, 22L, 23L, 25L, 26L. The ballast water may be stored only in the ballast water tank.
(2) Next, the water supply flow in the case of draining the ballast water loaded in the ballast water tanks 1L, 2L, 3L outside the ship will be described with reference to FIG. Here, it is assumed that the valves 19L, 20L, 22L, 23L, 25L, 26L, 65L, 52L, 66L, and 71L are opened and the other valves are closed under the control of the control device 100.

  As shown in FIG. 3, the ballast water in the ballast water tank 1L reaches the water inlet of the ballast water pump 9 through the pipe 21L, the valve 20, the valve 19, and the valve 65L. When ballast water flows out from the ballast water tank 1L, outside air flows in from the atmosphere opening port 28, and the atmospheric pressure in the ballast water tank 1L is kept constant. Similarly, the ballast water in the ballast water tank 2L passes through the pipe 24L, the valve 23L, and the valve 22L, and then merges with the ballast water from the ballast water tank 1L to reach the ballast water pump 9, and the ballast water in the ballast water tank 3L is After passing through the pipe 27L, the valve 26L, and the valve 25L, it merges with the ballast water from the ballast water tank 2L and reaches the ballast water pump 9. The ballast water fed under pressure by the ballast water pump 9L passes through the valve 52L, the pipe 53L, the valve 66L, the pipe 70L, the valve 71L, and the pipe 72L so as to avoid the raw ballast water purification device 15L. It reaches 7L. The water is discharged from the intake / drain port 7L to the water area where the ship floats.

Here, the ballast water is drained from all the ballast water tanks 1L, 2L, 3L on the port side, but the valve may be controlled so that the ballast water is drained only from any ballast water tank. Moreover, although the water supply flow which avoids the ballast water raw water purification apparatus 15L was demonstrated here, after purifying with the ballast water raw water purification apparatus 15L, it is good also as a structure which drains ballast water.
(3) Next, referring to FIG. 4, the flow of water supply when purified fresh water purified at the outboard fresh water supply facility is introduced from the port's receiving water distribution port and loaded on the port's ballast tanks 1L, 2L, 3L. explain. Here, it is assumed that the valves 45L, 48L, 50L, 81L, 52L, 19L, 20L, 22L, 23L, 25L, and 26L are opened and the other valves are closed under the control of the control device 100.

  As shown in FIG. 4, when the ship is on the port side of the ship, purified fresh water is taken in from the receiving and distributing water outlet 43L. The purified fresh water introduced into the hull passes through the valve 45L, the pipe 46L, the valve 48L, the valve 50L, and the pipe 51L and reaches the cushion tank 80L. The purified fresh water whose pressure is relaxed in the cushion tank 80 passes through the valve 81L and reaches the water supply port of the ballast water pump 9L. The purified fresh water supplied under pressure by the ballast water pump 9L passes through the valve 52L and the pipe 53L to reach the valve 19 so as to avoid the ballast water raw water purification device 15L. The purified fresh water that has reached the valve 19L is stored in the ballast tanks 1L, 2L, and 3L in the same water supply flow as in FIG.

  Here, although not shown in FIG. 4, a water pump is also provided in the fresh water supply facility, and operation control of the water pump of the fresh water supply facility and the ballast water pump 9 is performed in conjunction with each other. These interlocking operation control may be performed by the control apparatus 100, and may be performed by the control apparatus of a fresh water supply facility.

  Moreover, although the water supply flow which avoids the ballast water raw water purification apparatus 15L was shown above, the water supply which avoids the ballast water raw water purification apparatus 15L according to the detection result of the coliform detection sensor provided in piping 46, 47, 56 grade | etc., Is shown. It is good also as a structure which switches a flow and the water supply flow which passes 15L of ballast water raw water purification apparatuses. This Escherichia coli detection sensor is equipped with a MEMS chip that collects Escherichia coli in water, and automatically detects the genes of the collected bacteria, and can detect the amount of E. coli from the results of gene detection. is there. If Escherichia coli remains in the purified freshwater loaded in the ballast water tank, oxygen is consumed by the activity of the E. coli, and the ballast water tank may become deficient. There is a problem that its usage is limited. In order to avoid this, when the Escherichia coli detection sensor detects Escherichia coli that exceeds the specified level, the control device 100 opens the valve 17L and closes the valve 52L to switch to the water supply flow through the purification device 15L. Purify treatment of sterilization and removal. Thereby, Escherichia coli in the ballast water loaded in the ballast water tank can be sterilized and removed, and the above-described problems can be avoided.

In addition, although the case where the starboard ballast tank system was used was demonstrated here, when using the starboard ballast tank system, it is the same except using the receiving / distributing port 44 instead of the receiving / distributing port 43. Here, the purified fresh water is stored in all the ballast tanks 1L, 2L, 3L on the port side. However, the valve may be controlled so that the purified fresh water is stored only in an arbitrary ballast tank.
(4) Next, with reference to FIG. 5, when the purified fresh water stored in the port ballast tanks 1L, 2L, 3L is unloaded from the port's receiving water outlet to a land fresh water utilization facility (not shown), etc. The water supply flow will be described. Here, it is assumed that the valves 45L, 48L, 66L, 52L, 65L, 19L, 20L, 22L, 23L, 25L, and 26L are opened and the other valves are closed under the control of the control device 100.

  As shown in FIG. 5, the purified fresh water in the ballast water tank 1L reaches the water inlet of the ballast water pump 9 through the pipe 21L, the valve 20, the valve 19, and the valve 65L. Similarly, the purified fresh water in the ballast water tank 2L passes through the pipe 24L, the valve 23L, and the valve 22L, and then merges with the fresh water from the ballast water tank 1L and reaches the ballast water pump 9, and the purified fresh water in the ballast water tank 3L After passing through the valve 27L, the valve 26L, and the valve 25L, the fresh water from the ballast water tank 2L is merged to reach the ballast water pump 9. The fresh water pressure-fed by the ballast water pump 9L passes through the valve 52L, the pipe 53L, the valve 66L, the valve 48L, the pipe 46L, and the valve 45L so as to avoid the ballast water raw water purification device 15L, and receives and distributes water 43L. To. Purified fresh water is distributed from the receiving water distribution port 43L to a land-based fresh water utilization facility or the like.

  Here, the configuration in which the purified fresh water is distributed while avoiding the ballast water source water purification device 15L is shown, but the purified fresh water may be further purified and drained by the ballast water source water purification device 15L. Thereby, even if the on-site fresh water utilization facility requires purified fresh water of higher quality than the purified fresh water stored in the ballast water tank, it can be easily handled.

  Here, although not shown in FIG. 5, a water receiving pump is also provided on the fresh water utilization facility side, and operation control of the water receiving pump on the fresh water utilization facility side and the ballast water pump 9 is performed in conjunction with each other. . These linked operation controls may be performed by the control device 100, or may be performed by a control device on the fresh water utilization facility side.

Here, fresh water is supplied from all the ballast water tanks 1L, 2L, 3L on the port side. However, the valve may be controlled so that fresh water is supplied only from an arbitrary ballast water tank.
(5) Next, the water supply flow in the middle of switching from the water supply flow of FIG. 3 to the water supply flow of FIG. 4 will be described with reference to FIG. Immediately after draining the seawater loaded in the ballast tank, when the purified fresh water treated outside the ship is loaded on the ballast tank, the seawater remaining in the ballast water pump 9L, the valve 52L, the pipe 53L, etc., together with the purified fresh water, the ballast tank 1L, There is a problem that the salt concentration of the purified fresh water that flows into 2L and 3L and is stored in the ballast water tanks 1L, 2L, and 3L increases, and the quality of the purified fresh water deteriorates. In order to avoid this, when switching from the water supply flow of FIG. 3 to the water supply flow of FIG. 4, the valves 45L, 91L, 52L, 66L, 71L are opened and the other valves are closed by the control of the control device 100. Therefore, the water flow shown in FIG. 6 was formed.

  As shown in FIG. 6, when the ship is on the port side of the ship, purified fresh water is taken in from the receiving and distributing outlet 43L. The purified fresh water introduced into the hull reaches the water supply port of the ballast water pump 9L through the valve 45L, the pipes 46L and 90L, and the valve 91L. The purified fresh water supplied under pressure by the ballast water pump 9L passes through the valve 52L, the pipe 53L, the valve 66L, the pipe 70L, the valve 71L, and the pipe 72L so as to avoid the raw ballast water purification apparatus 15L. It reaches 7L. The water is discharged from the intake / drain port 7L to the water area where the ship floats.

  The water supply flow of FIG. 6 is continued until the salinity concentration of the ballast water in the pipe 72L becomes equal to or less than the predetermined salinity concentration. After all the remaining seawater is drained, the ballast water tank is switched to the water supply flow of FIG. It is possible to avoid an increase in the salt concentration of purified fresh water stored in the water.

  A configuration for measuring the salinity concentration of the ballast water in the pipe 72 will be described with reference to FIG. As shown in FIG. 9, a small-sized bypass pipe 92L is provided in the pipe 72L, and a salt concentration sensor element 93L for measuring the electrical conductivity of the fluid and measuring the salt concentration of the fluid is disposed in the flow path. The measurement signal of the salinity concentration sensor element 93L is transmitted to the salinity concentration measuring device 95L through the wiring 94L, and the salinity concentration of the fluid is measured in real time. This measurement result is transmitted to the control device 100, and when the salinity concentration of the ballast water in the pipe 72L becomes a predetermined value or less, the water supply flow in FIG. 6 is terminated and switched to the water supply flow in FIG. Thus, by providing the salinity concentration measuring device 95L, it is possible to detect that seawater has been completely discharged from the pipe 53L or the like, and it is possible to avoid continuing the drainage of the purified fresh water more than necessary. Here, the port pipe 72L has been described as an example, but the star pipe 72R may be provided with the same bypass pipe 92R, salt concentration sensor element 93R, and wiring 94R salt concentration measuring device 95R.

In addition, although the case where the salinity concentration sensor was installed in the pipes 72L and 72R was explained here, the salinity concentration sensor is also provided in each ballast water tank, and the salinity concentration of fresh water ballast water to be loaded is measured, and the low salinity concentration By controlling the loading operation with the control device 100 so that the fresh water ballast water can be loaded, the quality of the fresh water ballast water in the ballast water tank can be secured stably.
(6) Next, the water supply flow combining FIGS. 2 to 5 will be described with reference to FIGS. FIG. 7 shows an example in which purified fresh water is distributed from the ballast aquarium 2L of the port ballast aquarium system and seawater is loaded on the ballast aquarium 3R of the starboard ballast aquarium system. On the other hand, FIG. 8 is an example in which purified fresh water is loaded on the ballast water tank 2L of the port ballast water tank system and seawater is drained from the ballast water tank 3R of the starboard ballast water tank system.

When unloading or loading purified fresh water, the draft of the ship causes fluctuations in the relative height between the receiving and distributing ports 43 on the ship side and the connection between the receiving ports on the port side to maintain an airtight connection. Need to avoid. That is, the control device 100 controls the ballast water pumps 9L and 9R so that seawater having the same weight as the distributed purified freshwater can be loaded or seawater having the same weight as the loaded purified freshwater can be drained. As a result, fluctuations in the draft of the ship can be suppressed, and the purified fresh water can be safely unloaded or loaded.
(7) Next, the water supply flow shown in FIGS. 2 and 4 when unloading crude oil, LNG, etc. (hereinafter referred to as “crude oil etc.”) will be described. When unloading crude oil or the like, it is necessary to avoid fluctuations in the draft of the ship that cause fluctuations in the relative height of the two in order to maintain a hermetic connection at the connection between the discharge port on the ship side and the receiving port on the port side. That is, the control device 100 controls the ballast water pump 9 so that ballast water having the same weight as the unloaded crude oil or the like can be loaded, thereby suppressing fluctuations in the draft of the ship and safely loading the crude oil or the like. Can be taken down.

  On the other hand, the water supply flow of FIGS. 3 and 5 when loading crude oil or the like will be described. Even when crude oil or the like is loaded, it is necessary to avoid fluctuations in the draft of the ship that cause fluctuations in the relative positions of the two in order to maintain a hermetic connection at the connection between the discharge port on the ship side and the receiving port on the port side. That is, the control device 100 controls the ballast water pump 9 so as to drain or distribute ballast water having the same weight as the loaded crude oil or the like, thereby suppressing the draft of the ship to be substantially equal, It can safely load crude oil.

  In FIG. 14, the external appearance of the ship 111 for conveyance carrying the ballast tank system of a present Example is shown. On the port side of the deck, receiving ports 112L, 113L, 114L, 115L for crude oil and the like are provided, and on the starboard side, receiving ports 112L, 113L, 114L, 115L for crude oil and the like are provided. The liquid receiving / distributing ports 112 and 113 are main liquid receiving / distributing ports, and 114 and 115 are liquid receiving / distributing ports for collecting vaporized gas and the like.

In addition, receiving water distribution ports 43L and 44L are provided on the port side of the deck, and receiving water distribution ports 43R and 44R are provided on the starboard side. The receiving and distributing ports 43 and 44 are large receiving and distributing ports having a pipe diameter of 0.5 meters or more, and the purified fresh water is loaded through the receiving and distributing ports 43 and 44 at a loading speed of several thousand m ³ per hour. The land-side water inlet / outlet (not shown) has the same size, and a cargo crane 116 on board is used for connecting and disconnecting them. The liquid distribution ports 112 to 115 are also disposed within the operation range of the cargo crane 116, and the liquid distribution ports 112 to 115 can be attached and detached using the cargo crane 116.

  The pipes connected to the respective receiving / distributing liquid ports and receiving / distributing water ports are collected at the pump chamber inlet 117. The liquid distribution ports 112 to 115 are connected to a crude oil tank provided inside the ship, and the crude oil loaded via the liquid distribution port 112 is stored in the tank. Moreover, the crude oil stored in the tank can be unloaded via the receiving / distributing liquid port 112 or the like. The flow rate of the receiving / distributing liquid port 112 or the like is monitored by the control device 100, and a change in weight due to loading or unloading of crude oil or the like can be obtained. The weight change information obtained here is also used for the control for suppressing the draft fluctuation described above.

  According to the first embodiment described above, loading / unloading of crude oil, etc., loading of purified freshwater / seawater into the ballast tank, unloading of purified freshwater from the ballast tank / draining of seawater are performed in parallel. Therefore, the time required for unloading and loading the purified fresh water can be shortened. In addition, since the draft of the ship can be kept constant when unloading or loading crude oil or purified water, it is possible to safely unload and load crude oil or purified fresh water.

  The ship ballast water tank system of Example 2 is demonstrated using FIG. In addition, the same code | symbol is attached | subjected about the structure equivalent to Example 1, and detailed description is abbreviate | omitted. As shown in FIG. 10, the ballast water tank system of the ship of the second embodiment is different from the ballast tank system of the ship of the first embodiment in that the ballast water pump 284, valves 204, 207, 278, 283, 286, 288, 290, 291 are used. , And pipes 279, 280, 281, 282, 208, 285, 287, and the drainage of the ballast tank described with reference to FIGS. 7 and 8 only with the port system or only with the starboard system, Injection can be performed simultaneously. In addition, the display of the air release ports 28, 29, and 30 shown in FIG. 1 is omitted.

  Port A, a resource-rich country, carries crude oil, LNG, iron ore, coal, etc. (hereinafter referred to as “crude oil, etc.”), and at Port B, where there is no freshwater supply facility, unloads part of the crude oil and supplies freshwater. At port C where the facility is located, it is assumed that all crude oil and the like are unloaded and purified fresh water is loaded for transport to port A.

  At port B, it is necessary to inject ballast water corresponding to the weight of unloaded crude oil or the like into the ballast water tank. Since there is no freshwater supply facility at port B, seawater is injected into some ballast tanks.

  At port C, all the crude oil and the like are unloaded, the seawater in the ballast tank is drained, and purified freshwater from the freshwater supply facility is loaded into the ballast tank. At this time, in order to maintain the airtight connection at the connection portion between the receiving / distributing port 43 on the ship side and the receiving port on the port side, it is necessary to avoid fluctuations in the draft of the ship that cause fluctuations in the relative heights of the two. That is, in order to balance the decrease in weight on the ship side due to unloading of crude oil and the like and the distribution of ballast water, and the increase in weight on the ship side due to the injection of purified fresh water, it is necessary to carry out them simultaneously. The ballast water tank system of Example 2 can load seawater from the ballast water tank and load purified fresh water into the ballast tank at the same time when loading or unloading crude oil, etc., and can carry purified fresh water in a short time. This is a ballast tank system.

  Hereinafter, the ballast water tank system of Example 2 will be described in detail using the water supply flow of FIG. In FIG. 11, seawater is poured into the ballast tank 3L in the initial stage, and when the other ballast tanks (1L, 2L, 1R, 2R, 3R) are empty, the seawater in the ballast tank 3L is drained. In addition, a water supply flow when the purified fresh water is loaded in the ballast water tank 1L is shown.

  When unloading crude oil or the like at port C, fresh water from the onshore fresh water supply facility is loaded into an empty ballast water tank 1L and seawater in the ballast water tank 3L is drained in order to maintain the waterline of the ship. Seawater in the ballast water tank 3L passes through the valve 278, piping 279, 280, 281, 282, and valve 283, flows into the water inlet of the ballast water pump 84, is pressurized by the ballast water pump 284, and then pipes 285, 285. It passes through the valve 286, the pipes 287, 72, and is discharged from the intake / outlet 7 to the outside of the ship. On the other hand, the purified fresh water can be loaded in the ballast water tank 1L by the water supply flow described with reference to FIG. In addition to the configuration of the first embodiment, a valve 288L is provided in a pipe communicating with the water inlet of the ballast water pump 9, and the ballast water passes through the valve 288 and flows into the water inlet of the ballast water pump 9L.

  When the seawater in the ballast water tank 3L runs out, purified fresh water is also loaded into the ballast water tank 3L. However, in order to prevent the seawater from being mixed with the purified freshwater stored in the ballast tank 3L, it is necessary to discharge the residual seawater on the bottom and wall surface of the ballast tank 3L and complete the drainage of the seawater before storing the purified freshwater. . For this reason, as shown in FIG. 12, purified fresh water is injected into the ballast water tank 3L, and residual seawater is drained by the purified fresh water. It can be confirmed that the residual seawater is drained by the salinity concentration sensor element 93R and the wiring 94R salinity concentration measuring device 95R shown in FIG. When the residual seawater is completely drained, as shown in FIG. 13, the ballast water pump 284 is stopped, the valve 278L is closed, and the purified fresh water is stored in the ballast water tank 3L. Valves 290 and 291 are provided so that the same processing can be performed for the ballast water tanks 1L and 2L. Here, since the ballast water tank 1L is full, the valve 20L is closed, the valve 23L is opened, and water is poured into the ballast water tank 2L.

  Next, it will be described with reference to FIG. 10 that the ballast water pump 284 can be used as a spare pump for the ballast water pump 9L. The water inlets of the ballast water pump 284L and the ballast water pump 9 communicate with each other via valves 288L and 81L, a pipe 203L, a valve 204L, a pipe 282L, and a valve 283L. The discharge ports of the ballast water pump 84L and the ballast water pump 9 communicate with each other via a pipe 285L, a valve 207L, and a pipe 208L. Therefore, when the ballast water pump 9 breaks down, the valve 288L is closed and the valves 81L, 204L, 283L, and 207L are opened, so that a water supply flow that avoids the ballast water pump 9 can be configured. The ballast water pump 284 can be used as a substitute pump for the ballast water pump 9.

  According to the second embodiment described above, in addition to the effects obtained by the configuration of the first embodiment, the ballast water tank can be poured and drained at the same time using only one ballast water tank system. System operation can be realized. In addition, the ballast water pump for draining the ballast water tank can be used as a spare pump for the main ballast water pump, so that even if the main ballast water pump fails, the function of the ballast water tank system is maintained. be able to.

1-3 Ballast water tank 7 Drainage port 9,284 Ballast water pump 15 Ballast water source water purification device 43, 44 Receiving water distribution port

The above-described problems include a first ballast water tank, a first ballast water pump that performs water injection and drainage of the first ballast water tank, a second ballast water tank, and water injection and drainage of the first ballast water tank. The second ballast water pump and the second ballast water to be drained from the second ballast water tank when the first ballast water pump is controlled to inject water into the first ballast water tank. And a control means for controlling the water pump.

Claims (10)

A first ballast aquarium;
A first ballast water pump for injecting and draining the first ballast water tank;
A second ballast aquarium,
A second ballast water pump for injecting and draining the first ballast water tank;
Control means for controlling the second ballast water pump so as to inject water into the second ballast water tank when the first ballast water pump is controlled so as to inject water into the first ballast water tank; ,
A ship characterized by comprising: In the ship according to claim 1,
The ship that is injected into the first ballast water tank is purified fresh water loaded from the outside, and the water discharged from the second ballast water tank is seawater. In the ship according to claim 1,
The ship that is injected into the first ballast aquarium is seawater, and that that is drained from the second ballast aquarium is purified freshwater. In the ship according to claim 1,
The weight of the liquid inject | poured into a said 1st ballast water tank and the weight of the liquid drained from a said 2nd ballast water tank are substantially equal, The ship characterized by the above-mentioned. In the ship according to claim 1,
A ship in which the drafts during operation of the first and second ballast water pumps are substantially equal. Receiving and distributing outlets for receiving or distributing purified fresh water;
A ballast water pump for supplying liquid under pressure;
A ballast water tank for loading ballast water;
A first water supply flow from the receiving water distribution port to the ballast water tank through the ballast water pump and a second water supply flow from the ballast water tank to the receiving water distribution port through the ballast water pump. A control device capable of switching to the water flow,
A ship characterized by comprising: In the ship according to claim 6,
Furthermore, it has a water intake port for taking ballast water from the water area where the ship floats or draining ballast water in the water area where the ship floats,
The control device includes a third water supply flow from the water intake / outlet through the ballast water pump to the ballast water tank, and a water supply flow from the ballast water tank through the ballast water pump to the water intake / outlet. It is possible to switch to a fourth water supply flow leading to In the ship according to claim 7,
The said control apparatus can switch a water supply flow to the 5th water supply flow from the said receiving / distributing port to the said water intake port through the said ballast water pump and the said ballast water tank, The ship characterized by the above-mentioned. In the ship according to claim 8,
A marine vessel characterized in that a salinity concentration sensor for measuring a salinity concentration is provided in a pipe connecting the ballast water tank and the intake / drain port. In the ship according to claim 6,
On the deck, a receiving / distributing port for crude oil or LNG and the receiving / distributing port are provided close to each other, both of which are disposed within the operating range of the cargo crane.

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