JP5942799B2 - Ballast water discharge device - Google Patents

Description

  The present invention relates to a ballast water discharge device in a ship provided with a ballast tank.

  In a ship such as a tanker, when navigating to the destination again after unloading the crude oil, etc., the water called ballast water is usually placed in the ballast tank provided in the ship to balance the navigating ship. To store. Ballast water is basically taken at the loading port and discharged at the loading port, so if they are located in different locations, plankton and bacterial microorganisms contained in the ballast water will move around the world. become. Therefore, if ballast water is discharged from a loading port in a sea area different from the cargo port, microorganisms in another sea area will be released to that port, which may destroy the ecosystem in that sea area. Therefore, in order to prevent destruction of the marine environment due to such ballast water, for example, the ballast treated by trapping microorganisms in the ballast water with a filter and killing the remaining microorganisms that have passed through the filter by ultraviolet irradiation, etc. The water is discharged out of the ship.

  When using a ballast pump to discharge the ballast water in the ballast tank to the outside of the ship, if the water level in the ballast tank becomes low, the pressure on the suction side of the pump will drop, causing cavitation in the ballast pump, Because the pump capacity may be significantly reduced by sucking gas such as air or dust at the bottom from the pump suction port provided at the bottom of the tank, the ballast water remaining at the bottom of the ballast tank is surely discharged. It is known to use an ejector for the purpose (see, for example, “Prior Art” described in Patent Document 1).

JP-A-5-238473

  However, if an ejector is used to discharge the ballast water remaining at the bottom of the ballast tank, the discharge water discharged from the ejector will fluctuate due to the suction of gas, and the discharged water will become a gas-liquid two-phase flow. Vibration due to the phenomenon occurs. In particular, when an ultraviolet irradiation means is used for the treatment of ballast water, the vibration may damage the ultraviolet lamp and the protective tube protecting the ultraviolet lamp.

  An object of the present invention is to provide a ballast water discharge device that can prevent flow rate fluctuations caused by suction of gas from an ejector and vibration due to a gas-liquid two-phase flow.

  In order to achieve the above object, the invention described in claim 1 includes a ballast tank for storing ballast water, a ballast water discharge line for discharging ballast water stored in the ballast tank by a ballast pump, and the ballast tank. An ejector that sucks in the ballast water from a suction line connected to the suction port, a drive fluid supply line connected to the drive fluid supply port of the ejector, and that the water level in the ballast tank has reached a specific water level When detecting that the water level detection means to detect and the water level detection means has reached a specific water level, drainage of the ballast water from the ballast water discharge line is stopped and driven from the drive fluid supply line to the ejector And a control means for operating the ejector by supplying fluid, and discharging the ejector from the ejector to the discharge port side of the ejector. Characterized in that a gas-liquid separating means for separating gas entrained in the discharge water is.

  According to the present invention, the gas-liquid separation means for separating the gas mixed in the discharge water discharged from the ejector is provided on the discharge port side of the ejector. Is separated into a gas phase and a liquid phase, and the gas is removed from the discharged water. Thereby, the fluctuation | variation by the flow volume produced by gas mixing into discharge water and the vibration by a gas-liquid two-phase flow can be prevented, and the ultraviolet lamp of an ultraviolet irradiation means and a protection tube can be prevented from being damaged.

It is a schematic explanatory drawing which shows the 1st example of embodiment in the ballast water discharging apparatus which concerns on this invention. It is a schematic explanatory drawing which shows the 2nd example of embodiment in the ballast water discharging apparatus which concerns on this invention.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the ballast water discharge apparatus which concerns on this invention is demonstrated in detail with reference to the Example shown on drawing.
First, a first example of an embodiment of a ballast water discharge device according to the present invention will be described. FIG. 1 is a schematic explanatory view showing a first example of an embodiment of a ballast water discharging apparatus according to the present invention.

  The ballast water discharging apparatus in this example has passed through the ballast pump 2 that pumps the treated water to the ballast water treatment line 1, the filtering means 3 that filters and removes microorganisms contained in the treated water, and the filtering means 3. An ultraviolet irradiation means 4 for killing the remaining microorganisms by ultraviolet irradiation and a ballast tank 5 for storing treated water treated by irradiation with ultraviolet rays as ballast water are provided.

  The filtering means 3 filters and removes microorganisms such as plankton contained in the water to be treated, and includes a filter. The ultraviolet irradiation means 4 passed through the filtering means 3 by irradiating the water to be treated with ultraviolet rays of an ultraviolet lamp (not shown) built in the protective tube, that is, electromagnetic waves in a relatively short wavelength (100 to 400 nm) region. In order to kill the remaining microorganisms, a medium pressure mercury lamp is preferably used as the light source for ultraviolet irradiation in this case.

  The ballast water treatment line 1 between the ultraviolet irradiation means 4 and the ballast tank 5 is provided with a flow path switching valve 6, and treated water treated by irradiating ultraviolet rays is supplied to the flow path switching valve 6. An outboard discharge line 7 for discharging outside is connected. The flow path switching valve 6 is specifically a three-way valve, and can switch between water injection to the ballast tank 5 and water flow to the outboard discharge line 7 in response to a command from a control means to be described later. ing.

  In addition, the ballast water discharge device in the present example includes a ballast water discharge line 8 that discharges ballast water stored in the ballast tank 5 by the ballast pump 2, an ejector 9 that sucks up the ballast water in the ballast tank 5, and a discharge from the ejector 9. Gas-liquid separating means 10 for separating the discharged water mixed with the gas to be gas phase and liquid phase, water level detecting means 11 for detecting that the water level in the ballast tank 5 has reached a specific water level, and water level detecting means And control means 12 for stopping drainage of the ballast water from the ballast water discharge line 8 and supplying the drive fluid to the ejector 9 to operate the ejector 9 when it is detected that 11 has reached a specific water level. ing.

  One end of the ballast water discharge line 8 is connected to the ballast tank 5, and the other end is connected to the ballast water treatment line 1 upstream of the ballast pump 2, and the ballast water from the ballast tank 5 is ballasted by the ballast pump 2. Water is supplied from the water discharge line 8 to the ballast water treatment line 1. The ballast water discharge line 8 is provided with a ballast water discharge valve 13 that opens and closes the ballast water discharge line 8.

  The ballast water treatment line 1 between the filtration means 3 and the ultraviolet irradiation means 4 is provided with an on-off valve 14, and the ballast water treatment line 1 between the filtration means 3 and the on-off valve 14 and the drive of the ejector 9 are provided. A fluid supply port 15 is connected by a driving fluid supply line 16. The drive fluid supply line 16 uses the water pumped up from the sea chest (not shown) or another ballast tank (not shown) to the ballast water treatment line 1 by the ballast pump 2 as drive water (drive fluid) for the ejector 9. The driving fluid supply line 16 is provided with a driving fluid supply valve 17 that opens and closes the driving fluid supply line 16.

  The ejector 9 sucks up the ballast water in the ballast tank 5 from the suction line 19 connected to the suction port 18 by the kinetic energy of the driving water supplied from the driving fluid supply line 16. A suction port 20 that opens toward the bottom of the ballast tank 5 is provided at the end of the suction line 19, and the ballast water remaining at the bottom of the ballast tank 5 is sucked from the suction port 20.

  A discharge water line 22 is connected to the discharge port 21 of the ejector 9. The discharge water line 22 is composed of an on-off valve 14 provided on the downstream side of the filtration means 3 of the ballast water treatment line 1 and the ultraviolet irradiation means 4 via a gas-liquid separation means 10 and a discharge water valve 23 that opens and closes the discharge water line 22. Connected between.

  The gas-liquid separation means 10 separates the discharge water mixed with the gas discharged from the ejector 9 into a gas phase and a liquid phase. An exhaust line 25 having an exhaust valve 24 is connected to the gas-liquid separation means 10, the gas phase component is exhausted from the exhaust line 25 to the outside of the system, and the liquid phase component is supplied to the discharge water line 22. ing. In this example, a cyclone type gas-liquid separator or a collision plate type gas-liquid separator can be used as the gas-liquid separator 10.

  The water level detection means 11 transmits a signal to the control means 12 when detecting that the water level in the ballast tank 5 has reached the residual water discharge level L. The residual water discharge level L is set to a water level at which the ability of the ballast pump 2 is reduced due to the suction of gas and dust when the water level in the ballast tank 5 becomes lower.

  The control means 12 includes a ballast pump 2, a flow path switching valve 6, a water level detection means 11, a ballast water discharge valve 13, an on-off valve 14, a drive fluid supply valve 17, a discharge water valve 23, an exhaust valve 24, and a signal line 26, respectively. Connected through.

Next, the operation of the ballast water discharging apparatus of this example configured as described above will be described in the case of pouring water into the ballast tank 5 and the case of draining from the ballast tank 5.
First, when water is poured into the ballast tank 5, the ballast pump 2 is driven according to a command from the control means 12, the on-off valve 14 is opened, the ballast water discharge valve 13, the driving fluid supply valve 17, and the discharge water valve. 23 is closed. Further, the flow path switching valve 6 is operated so that water can be poured from the ballast water treatment line 1 to the ballast tank 5, and the flow path to the outboard discharge line 7 is blocked.

  By the driving of the ballast pump 2, the water to be treated is taken from the sea chest into the ballast water treatment line 1 and sent to the filtering means 3. The water to be treated sent to the filtering means 3 is sent to the ultraviolet irradiation means 4 after the plankton in the microorganisms is removed by the filter.

  The treated water sent to the ultraviolet irradiation means 4 is sent to the ballast tank 5 via the flow path switching valve 6 after the remaining microorganisms that have passed through the filter are killed by the ultraviolet irradiation in the ultraviolet irradiation means 4. And stored in the ballast tank 5.

Next, the case where the ballast water is discharged from the ballast tank 5 will be described.
In response to a command from the control means 12, the ballast pump 2 is driven, the ballast water discharge valve 13 and the on-off valve 14 are opened, and the drive fluid supply valve 17 and the discharge water valve 23 are closed. In addition, the flow path switching valve 6 is operated so that the ballast water treatment line 1 and the outboard discharge line 7 are communicated with each other so that water can be passed through the outboard discharge line 7 and the flow path to the ballast tank 5 is blocked. To do.

  By driving the ballast pump 2, the ballast water stored in the ballast tank 5 is sent from the ballast water discharge line 8 to the ballast water treatment line 1, and is sent from the ballast water treatment line 1 to the filtering means 3. The ballast water sent to the filtering means 3 cannot be killed during the water injection treatment to the ballast tank 5 by the filter, or the plankton in the microorganisms revived in the ballast tank 5 during the voyage is removed, and the ultraviolet irradiation means 4 is sent.

  The ballast water sent to the ultraviolet irradiation means 4 is discharged from the outboard discharge line 7 via the flow path switching valve 6 after the remaining microorganisms that have passed through the filter are killed by the ultraviolet irradiation in the ultraviolet irradiation means 4. It is discharged out of the ship.

  When the discharge of the ballast water in the ballast tank 5 proceeds and the water level in the ballast tank 5 reaches the residual water discharge level L, the water level detection means 11 detects this and sends a signal to the control means 12. The ballast pump 2 is continuously driven by the command from the control means 12 that has received this, and the driving fluid supply valve 17, the discharge water valve 23, and the exhaust valve 24 are opened, and the ballast water discharge valve 13 and the on-off valve 14 are closed. And In addition, the flow path switching valve 6 continues to be able to pass water from the ballast water treatment line 1 to the outboard discharge line 7 and shuts off the flow path to the ballast tank 5.

  By driving the ballast pump 2, drive water is pumped from the sea chest to the ballast water treatment line 1 and sent to the filtering means 3. Plankton in the microorganisms is removed from the drive water sent to the filtering means 3 by the filter, and sent from the drive fluid supply line 16 to the ejector 9. As a result, the ejector 9 operates upon receiving the supply of driving water. With the operation of the ejector 9, the ballast water at the bottom of the ballast tank 5 is sucked up from the suction port 20 via the suction line 19. In this example, pumped water from the sea chest is used as the drive water for the ejector 9, but water in another ballast tank may be used as the drive water for the ejector 9.

  The ballast water sucked up by the ejector 9 is mixed with the drive water and discharged from the discharge port 21 of the ejector 9. The discharged water discharged from the ejector 9 is mixed with a gas by sucking a gas such as air from the suction port 20. The discharge water mixed with this gas is sent from the discharge water line 22 to the gas-liquid separation means 10, and is separated into a gas phase and a liquid phase by the gas-liquid separation means 10. The gas phase component is exhausted from the exhaust line 25 to the outside of the system, and the liquid phase component is sent from the discharge water line 22 through the ballast water treatment line 1 to the ultraviolet irradiation means 4.

  The discharged water sent to the ultraviolet irradiation means 4 is discharged from the outboard discharge line 7 via the flow path switching valve 6 after the microorganisms in the discharged water are killed by the ultraviolet irradiation in the ultraviolet irradiation means 4. Discharged.

  When the ballast water at the bottom of the ballast tank 5 is discharged by the ejector 9 and the ballast water in the ballast tank 5 becomes empty, the water level detection means 11 detects this and sends a signal to the control means 12, The driving of the ballast pump 2 is stopped by the received command from the control means 12, and drainage from the ballast tank 5 is completed.

  As described above, according to the ballast water discharge device of this example, the discharge water from the ejector 9 mixed with gas is separated into the gas phase and the liquid phase by the gas-liquid separation means 10 provided in the discharge water line 22. Since the gas is removed from the discharge water, it is possible to prevent fluctuations caused by mixing of the gas into the discharge water and vibration due to the gas-liquid two-phase flow, and damage to the ultraviolet lamp and the protective tube of the ultraviolet irradiation means 4 is prevented. I can.

  Further, since the ballast water stored in the ballast tank 5 is treated not only when water is poured into the ballast tank 5 but also when drained from the ballast tank 5, it is treated by the filtering means 3 and the ultraviolet irradiation means 4, so that it is killed during the water filling process. Microorganisms that could not be destroyed or revived in the ballast tank 5 during the voyage can also be reliably removed.

Next, a second example of the embodiment of the ballast water discharging apparatus according to the present invention will be described. FIG. 2 is a schematic explanatory view showing a second example of the embodiment of the ballast water discharging apparatus according to the present invention.
About the ballast water discharging apparatus of this example, the same code | symbol is attached | subjected about the structure same as a 1st example, the description is abbreviate | omitted, and only a structure different from a 1st example is demonstrated.

  The ballast water discharge device of this example uses a gas vent provided in the filtering means 3 as the gas-liquid separating means 10, and the discharged water mixed with the gas discharged from the ejector 9 by the gas venting of the filtering means 3. Is separated into a gas phase and a liquid phase, and the gas phase component is exhausted from the exhaust line 25 to the outside of the system.

  In this example, an on-off valve 14 is provided in the ballast water treatment line 1 between the ballast pump 2 and the filtering means 3, and a driving fluid is supplied to the ballast water treatment line 1 between the ballast pump 2 and the on-off valve 14. Line 16 is connected. In this example, a discharge water line 22 is connected to the ballast water treatment line 1 between the on-off valve 14 and the filtering means 3.

  According to the ballast water discharge device of this example configured as described above, the driving water is pumped from the sea chest to the ballast water treatment line 1 by driving the ballast pump 2, and the driving water is driven from the ballast water treatment line 1 to the driving fluid. It is sent to the ejector 9 through the supply line 16. As a result, the ejector 9 operates upon receiving the supply of driving water. With the operation of the ejector 9, the ballast water at the bottom of the ballast tank 5 is sucked up from the suction port 20 via the suction line 19. In this example, similarly to the first example, the pumped water from the sea chest is used as the drive water for the ejector 9, but the water in the other ballast tanks may be used as the drive water for the ejector 9. Good.

  The ballast water sucked up by the ejector 9 is mixed with the drive water, discharged from the discharge port 21 of the ejector 9, and sent from the discharge water line 22 through the ballast water treatment line 1 to the filtering means 3. The discharged water from the ejector 9 sent to the filtering means 3 is separated into a gas phase and a liquid phase by degassing the filtering means 3 while the microorganisms in the discharged water are removed by the filter of the filtering means 3. Is exhausted from the exhaust line 25 to the outside of the system, and the liquid phase is sent from the ballast water treatment line 1 to the ultraviolet irradiation means 4.

  In this way, in the ballast water discharge device of this example, the discharge water from the ejector 9 mixed with the gas is separated into the gas phase and the liquid phase by degassing provided in the filtering means 3, and the gas is discharged from the discharge water. Since it is removed, it is possible to prevent fluctuations caused by gas mixture in the discharge water and vibration due to gas-liquid two-phase flow, and damage to the ultraviolet lamp and the protective tube of the ultraviolet irradiation means 4 can be prevented.

  The ballast water stored in the ballast tank 5 contained in the discharge water from the ejector 9 is not only injected into the ballast tank 5 but also drained from the ballast tank 5 by the filtering means 3 and the ultraviolet irradiation means 4. Therefore, the microorganisms that could not be killed during the water injection process or revived in the ballast tank 5 during the voyage can be surely removed.

DESCRIPTION OF SYMBOLS 1 Ballast water treatment line 2 Ballast pump 3 Filtration means 4 Ultraviolet irradiation means 5 Ballast tank 6 Flow path switching valve 7 Outboard discharge line
8 Ballast water discharge line 9 Ejector 10 Gas-liquid separation means 11 Water level detection means 12 Control means 13 Ballast water discharge valve 14 On-off valve 15 Drive fluid supply port 16 Drive fluid supply line 17 Drive fluid supply valve 18 Suction port 19 Suction line 20 Suction Port 21 Discharge port 22 Discharge water line 23 Discharge water valve 24 Exhaust valve 25 Exhaust line 26 Signal line

Claims (1)

A ballast tank for storing ballast water;
A ballast water discharge line for discharging ballast water stored in the ballast tank by a ballast pump;
An ejector that sucks up ballast water in the ballast tank from a suction line connected to a suction port;
A drive fluid supply line connected to the drive fluid supply port of the ejector;
Water level detection means for detecting that the water level in the ballast tank has reached a specific water level;
When the water level detecting means detects that a specific water level has been reached, the drainage of the ballast water from the ballast water discharge line is stopped, and the drive fluid is supplied from the drive fluid supply line to the ejector. Control means for operating
A ballast water discharge device, characterized in that gas-liquid separation means for separating gas mixed in the discharge water discharged from the ejector is provided on the discharge port side of the ejector.

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