JPH0585465A - Oil collection work vessel - Google Patents

Abstract

PURPOSE:To improve the efficiency of recovery work in the case of a work vessel for collecting oil run out to the sea or the like by providing inside or outside ship shells oil collection tanks having side walls higher than the water line and bottom surfaces deeper than an oil collection border line, opening an oil collection opening in the vicinity of the oil water border line of a side wall. CONSTITUTION:The primary oil collection tank 2 and the secondary oil collection tank 3 are provided extending over the paired right and left ship shells 1a, 1b and the outside of a ship shell 1 in the middle of ship shells 1a, 1b. The primary oil collection tank 2 is composed of side walls 2a whose upper edges are at higher positions than that of the water line, and a bottom surface 2b deeper than an oil collection border line that is lower than the water line WL. And, oil is taken into the primary oil collection tank 2 by forming an oil collection opening 4 at a position in the vicinity of an oil water border line OL at a side wall 2a. Both oil collection tanks 2, 3 are connected to each other by means of oil passing pipes 11 at positions lower than the oil water border line OL and by means of a water passing pipe 12 at a position near a bottom surface 2c. Near the bottom of the secondary oil collection tank 3, a draining device 14 is connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil collecting work vessel for collecting oil spilled into the sea, lakes, rivers and the like.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of nature conservation, there is a strong demand for preventing marine pollution, particularly marine pollution due to the outflow of crude oil and the like. When a crude oil spill actually occurs, it is necessary to narrow the range in which the crude oil diffuses as much as possible.For that reason, the diffusion range is limited using an oil fence, and the spilled crude oil is manually laundered, for example, It is collected using a suction mat and an oil coagulant.

[0003]

This conventional oil spill recovery work requires a remarkably large amount of manpower, is very inefficient, and has a problem that a large amount of oil diffuses into seawater during recovery. is there.

In view of the above circumstances, it is an object of the present invention to provide an oil collecting work ship capable of recovering oil with high efficiency.

[0005]

In order to achieve this object, an oil collecting work vessel according to the present invention is provided with an oil collecting tank having a side wall and a bottom surface inside or outside the hull, and the upper end of the side wall. Is positioned higher than the water line, the bottom surface is located deeper than the oil-water boundary line lower than the water-water line, and a part of the side wall is provided with an oil collecting port that opens upward from the oil-water boundary line. ..

The present invention will be described in more detail as follows. The hull of the present invention may be a single-hull type, a double-hull type, or a multi-hull type with three or more shells.

The oil collecting tank may be provided in the hull,
It may be provided outside the hull. Of course, the oil collecting tank may be provided so as to be separated from the hull.

As for the shape of the oil collecting tank, a side wall and a bottom surface are provided, and an oil collecting port described later is provided at a part of the side wall, and the bottom surface may be wholly or partially blocked by the bottom wall. , May be released underwater. Further, the side wall may be a straight cylinder type or a funnel type or the like having a different diameter. Further, it is arbitrary whether or not the upper surface of the oil collecting tank is closed by the upper wall.

The oil collecting port may be opened in the vicinity of the oil / water boundary line, and the opening direction may be the bow side, the port side, or the stern side of the hull. However,
The opening direction of the oil collecting port is preferably in the bow side or the bow side so that the oil layer can be efficiently introduced into the oil collecting tank as the hull navigates. Is most preferred.

Further, when the oil collecting port is opened toward the bow direction, in order to guide the oil to the oil collecting port with higher efficiency, an oil guiding passage which is widened from the oil collecting port toward the bow direction is provided. More preferable. The width of the inlet of the oil passage is not particularly limited, but in order to prevent oil from adhering to the hull,
It is preferable to open it wider than the width of the ship.

Further, in order to guide the oil to the oil collecting port with higher efficiency, it is possible to provide an oil collecting means for feeding the upper oil layer from the oil / water boundary line to the oil collecting port or the oil guiding passage. As the oil collecting means, there are provided a large number of paddles provided parallel to the horizontal axis of rotation, or an oil collecting paddle having a large number of paddles radially provided on the vertical axis of rotation, and a drive device for rotationally driving the paddles. An oil collecting means including an oil collecting means, an oil fence in which the oil collecting means surrounds a water area in the opening direction of the oil collecting port, and a winding device for winding the oil fence can be considered.

The height of the lower side edge of the oil collecting port may be set to a constant depth from the water line, but it is preferable that the height can be adjusted according to the depth of the oil layer floating on the water surface.

There are the following three means for adjusting the height of the lower edge of the oil collecting port. In the first means, the oil collecting tank is provided so as to be movable up and down with respect to the hull, and the lower edge of the oil collecting port is adjusted to the oil-water boundary line by adjusting the height of the oil collecting tank with respect to the hull. In this case, a method of adjusting the height of the oil collecting tank by using an elevating device that moves the oil collecting tank up and down, and the oil collecting tank is almost the same as seawater or fresh water so that the lower edge of the oil collecting port is located almost at the oil / water boundary. It is considered that the structure is composed of a floating body having a specific gravity.

In the second means, the oil collecting tank is fixed to the hull,
The lower edge of the oil collection port is composed of a movable weir that can be moved up and down, and the height of the lower edge of the oil collection port becomes the oil-water boundary line by adjusting the height of the movable weir with respect to the hull and the oil collection tank. Adjusted.
In this case, as a method for adjusting the height of the movable weir, a method of using a drive device for moving the movable weir up and down and a method of adjusting the movable weir to almost seawater or fresh water so that the lower edge of the oil collection port is located substantially at the oil-water boundary line are used. It is conceivable that the floating body is constructed with the same specific gravity as.

In the third means, the oil collecting tank is fixed to the hull,
By providing a water tank for adjusting waterfall inside or outside the hull, and adjusting the amount of water stored in the water tank to adjust the height of the waterline of the hull and the oil collecting tank, the lower edge of the oil collecting port Is adjusted to the oil-water boundary. In this case, means for supplying water to the water tank and means for draining water from the water tank are required.

Of these means, the second means is the most preferable because it is the simplest and easiest to implement, and the height of the lower edge of the oil collecting port can be easily adjusted. The height of the upper edge of the oil collecting port is not particularly limited, but it is preferable to position it near the waterline in order to smoothly guide the oil layer into the oil collecting tank.

In practice, it is inevitable that water will flow into the oil collecting tank in addition to the water diffused in the oil layer and the water below the oil layer. Therefore, it is advantageous to store a larger amount of oil in the oil collecting tank by discharging this water from the oil collecting layer. This water is discharged by utilizing the fact that the water is separated into the lower side of the oil layer due to the difference in specific gravity between water and oil, and a method of connecting the drainage device to the bottom of the oil collection tank and forcibly discharging the water is used. Then, it is considered that the bottom surface of the oil collecting tank is entirely or partially opened in water to allow natural drainage. However, when the bottom surface of the oil collecting tank is wholly or partially opened to the water, the water pressure acting on the oil / water separation line in the oil collecting tank hinders the oil layer from flowing into the oil collecting tank. It is unsuitable for recovering oil, and in order to recover a large amount of oil, it is necessary to forcibly drain it with a drainage device.

In order to prevent the oil from being discharged to the outside together with the drainage, a sensor is provided at the bottom of the oil collecting tank to detect that the oil / water boundary line in the tank is below a predetermined height. It is preferable that the drainage work is stopped when the oil-water boundary line falls below a predetermined height.

The sensor is a conductive sensor which is turned on and off by a difference in conductivity between water and oil, a photoelectric sensor which is turned on and off by a difference in transmissivity or reflectance between water and oil, and a specific gravity between water and oil. It is possible to use a specific gravity sensor that is turned on and off by a difference, a pressure sensor that is turned on and off by a change in the internal pressure of the oil collecting tank at a predetermined height, and the like.

When utilizing the fact that water is separated to the lower side of the oil layer due to the difference in specific gravity between water and oil as described above, a certain sedation time is required for separating oil and water in the oil collecting tank. Become.
Therefore, when a large amount of oil is collected in a short time, oil-water separation becomes insufficient, and water containing oil may be discharged from the drainage device (or the bottom surface of the oil collecting tank) and secondary pollution may occur. Occurs.

As will be described later, this problem is caused by providing a plurality of oil collecting tanks and providing one oil collecting tank with an oil collecting port.
The oil collecting tank and the upper portions of other oil collecting tanks are communicated with each other one after another through the oil passages below the oil collecting port, and the bottoms of the oil collecting layers are sequentially communicated with each other through water passages. This can be solved by interposing a stop valve and providing a forced drainage means in the final oil collecting tank.

Finally, in the present invention, there is no obstacle to providing an oil tank for containing the oil recovered from the upper part of the oil collecting tank.

[0023]

In the present invention, the oil collecting tank is moved with respect to the water in which the oil layer is floating by moving the hull or by the flow of water in which the oil layer is floating. Since the oil collecting port that opens in the vicinity of the oil-water boundary line is formed in a part of the side wall of the oil collecting tank, almost only the oil layer flows into the oil collecting tank and is collected.

[0024]

Embodiments of the present invention will now be described in detail with reference to the drawings, but the present invention is not limited thereto.
FIG. 1 is a central longitudinal side view of an oil collecting work boat according to an embodiment of the present invention, and FIG. 2 is a plan view across the waterline.

Even if the hull 1 of the oil collecting work ship is a single-hull type,
Although it may be a twin-body type or simply a multi-body type with three or more bodies, in this embodiment, a twin-body type capable of obtaining excellent rolling characteristics (rolling characteristics) with a relatively simple structure. It is equipped with a hull 1.

A primary oil collecting tank 2 and a secondary oil collecting tank 3 are provided side by side in front of and behind the outside of the middle hull 1 of the pair of left and right hulls 1a and 1b and inside the left and right hulls 1a and 1b. The primary oil collecting tank 2 and the secondary oil collecting tank 3 may be provided so as to be separable from the hull 1, but in this embodiment, the hull structure is strengthened and the capacity is large both inside and outside the left and right hulls 1a and 1b. In order to form the primary oil collecting tank 2, the left and right hulls 1a and 1b, the primary oil collecting tank 2 and the secondary oil collecting tank 3 are fixed to each other.

The primary oil collecting tank 2 has a side wall 2a and a bottom surface 2b.
It suffices that an oil collecting port 4 is provided and a later-described oil collecting port 4 is provided in a part of the side wall, and the bottom surface 2b may be wholly or partially blocked by the bottom wall 2c, or may be opened in water. .. In this embodiment, the bottom surface 2b is entirely closed by a bottom wall 2c so that the water in which oil has diffused is not diffused from the primary oil collecting tank 2.

The side wall 2a may be formed in any shape such as a straight cylinder type, a funnel type or the like having a different diameter, as long as the upper edge thereof is higher than the water line WL. However, in this embodiment, in order to facilitate the shipbuilding, the front wall and the rear wall are vertical walls, and the left and right side walls are the hull plates of the hulls 1a and 1b.

The secondary oil collecting tank 3 is formed in the same shape as the primary oil collecting tank 2 except that the oil collecting port 4 is omitted.

Although the upper surfaces of the primary and secondary oil collecting tanks 2 and 3 may be opened, in this embodiment, in order to enhance the convenience of deck work, the upper walls 2d and 3d also used as decks are closed. is there.

The oil collecting port 4 may be opened above the oil / water boundary line OL, and the opening direction may be the bow side, the port side, or the stern side of the hull. .. However, the opening direction of the oil collecting port 4 is preferably such that the oil collecting neck 4 is opened on the bow side or the port side so that the oil layer can be efficiently introduced into the primary oil collecting tank 2 as the hull 1 travels. , Here, it is opened to the bow side where oil can be collected most efficiently.

Further, in order to guide the oil to the oil collecting port 4 with higher efficiency, an oil guiding pipe 5 is provided which spreads from the oil collecting port 4 toward the bow direction. The oil guide pipe 5 is provided between the left and right hulls 1a and 1b and between the oil collecting arms 6 derived from the bows of the hulls 1a and 1b, and the width D of the inlet is not particularly limited. In order to prevent oil from adhering to the sea, it is opened wider than the width W of the water line WL.

The lower edge of the oil collecting port 4 is adjusted in height with respect to the water-draining line WL in accordance with the depth of the oil layer O, and the oil-water boundary line O
It is preferable to position L or slightly below it.

As means for adjusting the position of the lower side edge of the oil collecting port 4, means for adjusting the position of the lower side edge of the oil collecting port 4 without changing the water line WL of the hull 1 and hull It can be roughly divided into means for changing the water-sustaining line WL.

Means for adjusting the position of the lower edge of the oil collecting port 4 without changing the water line WL of the hull 1 further includes the height of the primary oil collecting tank 2 and the secondary oil collecting tank 3 relative to the hull 1. There is a means for changing the height and a means for changing only the lower edge of the oil collecting port 4 with respect to the hull 1.

The means (first means) for changing the height of the primary oil collecting layer 2 with respect to the hull 1 is, for example, as shown in FIG. 3, a primary oil collecting tank 2, a secondary oil collecting tank 3 and an oil tank described later. 19
Is provided so as to be able to move up and down with respect to the hull 1, and by adjusting the heights of the primary oil collecting tank 2, the secondary oil collecting tank 3 and the oil tank 19 with respect to the hull 1, the lower edge of the oil collecting port 4 is an oil / water boundary. Adjusted to line OL.

In this case, the primary oil collecting tank 2, the secondary oil collecting tank 3 and the oil tank 19 are used by using an elevating device for moving the primary oil collecting tank 2 up and down.
Of adjusting the height of the primary oil collecting tank 2, the secondary oil collecting tank 3 and the oil tank 19 so that the lower edge of the oil collecting port 4 is located substantially at the oil / water boundary OL. It can be considered to be composed of a floating body. At this time, since the specific gravities of the floating bodies forming the primary oil collecting tank 2, the secondary oil collecting tank 3 and the oil tank 19 change, the heights of the primary oil collecting tank 2, the secondary oil collecting tank 3 and the oil tank 19 are adjusted using the lifting device. You can make more accurate adjustments.

The means (second means) for changing only the lower edge of the oil collecting port 4 with respect to the hull 1 is, for example, as shown in FIG. 1, a primary oil collecting tank 2, a secondary oil collecting tank 3 and an oil tank. 19 for the hull 1
The movable weir 7 fixed to the lower end of the oil collecting port 4 is movable up and down.
The movable weir 7 for the hull 1 and the primary oil collecting tank 2
The height of the lower edge of the oil collecting port 4 is adjusted to the oil-water boundary line OL by adjusting the height of the oil collecting port 4. In this case, as a method of adjusting the height of the movable weir 7, a method of using a drive device for vertically moving the movable weir 7 can be considered, but in this embodiment,
As shown in FIG. 1, the lower edge of the oil collecting port 4 has a simple structure and is inexpensive, and the height of the movable weir 7 is automatically adjusted to the oil / water boundary line OL. The movable weir 7 is composed of a floating body having substantially the same specific gravity as seawater or fresh water so that the movable weir 7 is located at the oil-water boundary line OL.

As a means (third means) for changing the waterline WL of the hull 1, for example, as shown in FIG. 4, the primary oil collecting tank 2, the secondary oil collecting tank 3 and the oil tank 19 are fixed to the hull 1. By providing a water tank 8 for adjusting the water consumption in the hull 1 and adjusting the amount of water stored in the water tank 8 to adjust the height of the water-warming line WL of the hull 1 and the primary oil collecting tank 2, the oil collecting port 4 The height of the lower edge of is adjusted to the oil-water boundary line OL. In this case, means for supplying water to the water tank 8 and means for draining water 10 from the water tank are required.

The height of the upper edge of the oil collecting port 4 is not particularly limited, but in order to smoothly guide the oil layer O into the primary oil collecting tank 2, the oil collecting port 4 is located in the vicinity of the water collecting line WL, particularly above the water collecting line WL. Preferably, in this embodiment, as shown in FIG. 1, the oil collecting port 4 is opened up to the upper wall 2d which also serves as a deck.

In practice, it is inevitable that water will flow into the primary oil collecting tank 2 other than oil, such as water diffused in the oil layer and water below the oil layer. Therefore, it is advantageous to store a larger amount of oil in the primary oil collecting tank 2 and the secondary oil collecting tank 3 by discharging this water from the primary oil collecting tank 2 and the secondary oil collecting tank 3.

The water is discharged by utilizing the fact that the water is separated to the lower side of the oil layer due to the difference in specific gravity between water and oil. The secondary oil collecting tank 3 (when the secondary oil collecting tank 3 is not provided, A method for connecting the drainage device 14 to the bottom of the primary oil collecting tank 2) to forcibly drain water, and a bottom surface of the secondary oil collecting tank 3 (or the primary oil collecting tank 2 if the secondary oil collecting tank 3 is not provided). Or,
It is considered to be a method in which it is partially opened to the water and drained naturally.

However, in this embodiment, the water pressure acting on the oil / water boundary line OL in the secondary oil collecting tank 3 hinders the inflow of the oil layer O into the secondary oil collecting tank 3 and thus the primary oil collecting tank 2 Since it hinders the flow of the oil layer O into the drainage device 1,
4 is forcibly drained to store a larger amount of oil.

The drainage device 14 is provided with a drainage pipe 14a led out from the bottom of the secondary oil collecting tank 3 to above the waterline WL, and a drainage pump 14b interposed in the drainage pipe 14a.

In order to prevent the oil from being discharged to the outside together with the drainage, at the bottom of the secondary oil collecting tank 3 (or the primary oil collecting tank 2 if the secondary oil collecting tank 3 is not provided), the oil-water boundary in the tank is formed. A sensor 17 is provided for detecting that the line OL has fallen below a predetermined height above the water inlet of the drainage device 14,
When the oil / water boundary line OL in the tank has dropped below a certain height, the drainage device 14 is stopped to stop the drainage work.

The sensor 17 is a conductive sensor which is turned on and off by a difference in conductivity between water and oil, a photoelectric sensor which is turned on and off by a difference in transmissivity or reflectance between water and oil, and a sensor between water and oil. A specific gravity sensor that is turned on and off by the difference in specific gravity, a pressure sensor that is turned on and off by a change in the internal pressure of the secondary oil collecting tank 3 at a predetermined height (or the primary oil collecting tank 2 if the secondary oil collecting tank 3 is not provided) are used. It is possible to

Whether or not the secondary oil collecting tank 3 is provided is determined by the relationship between the sedation time required for separating oil and water in the primary oil collecting tank 2 and the amount of oil flowing into the primary oil collecting tank 2. .. That is,
If the amount of oil flowing into the primary oil collecting tank 2 per unit time is small, the oil and water are sufficiently calmed in the primary oil collecting tank 2 and separated by the difference in their specific gravities, but they flow into the primary oil collecting tank 2. When the amount of oil per unit time increases, the oil does not calm down within a short time, and the oil tends to diffuse in the water near the bottom of the primary oil collecting tank 2. In this embodiment, in order to collect a large amount of oil in the shortest possible time, the secondary oil collecting tank 3 is provided, and the upper part of the primary oil collecting tank 2 and the upper part of the secondary oil collecting tank 3 are separated from the oil / water boundary line OL. Is communicated with the oil passage 11 at a lower position, and the bottom of the primary oil collecting tank 2 and the bottoms of the secondary oil collecting tanks 3 are communicated with each other through the water collecting pipe 12, and the water collecting pipe 12 is connected from the secondary oil collecting tank 3 to the primary oil collecting tank 2 Check valve 1 to prevent backflow to the
3 is interposed, while the drainage device 1 is provided at the bottom of the secondary oil collecting tank 3.
4 are connected.

An oil collecting port 4 is provided in the upper part of the primary oil collecting tank 2.
In order to prevent the oil layer O that has flowed in from directly flowing into the oil passage pipe 11, a baffle plate 15 that covers the opening of the oil passage pipe 11 is provided, and the bottom of the secondary oil collecting tank 3 flows from the water passage pipe 12. In order to prevent water from being directly sucked into the drainage device 14, a baffle plate 16 that covers the water inlet of the drainage device 14 is provided.

According to this structure, when the drainage device 14 is operated to discharge the water at the bottom of the secondary oil collecting tank 3, the liquid level of the secondary oil collecting tank 3 lowers, and the lowering of the liquid level is recovered. Then, the oil flows from the primary oil collecting tank 2 through the oil passage pipe 11 into the upper part of the secondary oil collecting tank 3.

Then, by discharging water from the bottom of the secondary oil collecting tank 3 and flowing oil into the upper part of the secondary oil collecting tank 3, the primary oil collecting tank 2
When the pressure difference between the internal pressure at the bottom of the secondary oil collecting tank 3 and the internal pressure at the bottom of the secondary oil collecting tank 3 exceeds a certain level, the check valve 13 is opened, and only the water from the bottom in the primary oil collecting tank 2 passes through the water pipe 12. The liquid at the bottom of the primary oil collecting tank 2 which has become the above flows into the secondary oil collecting tank 3. As a result, the water layer in the primary oil collecting tank 2 becomes thin, and the oil layer O flows from the oil collecting port 4 into the primary oil collecting tank 2 so as to make up for the decrease in the water layer. The depth gets deeper. The water flowing into the secondary oil collecting tank 3 is calmed without being affected by the disturbance caused by the inflow of the oil layer 2 into the primary oil collecting tank 2 in the secondary oil collecting tank 3, and the oil contained in this water is sufficiently separated. Then, it joins the oil layer O accumulated in the upper portion of the secondary oil collecting tank 3.

In order to further enhance the oil collecting ability, an oil collecting tank of a tertiary or higher order is provided, each oil collecting tank is connected in order with an oil passage and a water passage, and the drainage device 14 is provided at the bottom of the last oil collecting tank. Just connect.

In addition, the oil collecting work vessel includes a primary oil collecting tank 2
Further, an oil tank 19 for collecting and containing the oil layer O collected in the secondary oil collecting tank 3 through the oil collecting pipe 18 is provided. The oil collecting pipe 18 is a manifold 18 a led out from a predetermined depth of the primary oil collecting tank 2 and the secondary oil collecting tank 3 to an upper portion of the oil tank 19.
And the on-off valve 18b interposed in each branch pipe of the manifold 18a
And an oil pump 18c interposed in the main pipe of the manifold 18a.

According to this oil collecting work boat, when the oil collecting work boat is made to sail in the bow direction, the oil layer O in front of the bow heads toward the oil collecting port 4 while being collected by the oil collecting arm 6. Then, by operating the drainage device 14, as described above, the oil flows into the primary oil collecting tank 2 through the oil collecting port 4, and further flows into the secondary oil collecting tank 3 to be collected. When the oil is stored in the primary oil collecting tank 2 and the secondary oil collecting tank 3 to a predetermined depth, the oil collected in the primary oil collecting tank 2 and the secondary oil collecting tank 3 is transferred to the oil tank 19 through the oil feeding pipe 18. The water mixed in the primary oil collecting tank 2 and the secondary oil collecting tank 3 is dumped outboard by the drainage device 14. Therefore, the oil can be efficiently separated from the water and recovered by only the personnel necessary for maneuvering, and it is possible to prevent a large amount of oil from diffusing into the water during the oil recovery operation with a small amount of manpower.

In another embodiment of the present invention, as shown in FIGS. 5 to 7, for example, oil collecting means 20, 21 or 22 for positively feeding the oil layer to the oil collecting port 4 is provided. The oil collecting means 20, 21 or 22 is of a type in which oil is sent to the oil collecting port 4 by the paddles 20a or 21a as shown in FIG. 5 or 6, and the oil layer O of a certain range as shown in FIG. Is enclosed by an oil fence 22a, and the enclosure of the oil fence 22a is squeezed to a small size to divide oil into the oil collecting port 4.

As the type using the paddles 20a or 21a, as shown in FIG. 5, an oil collecting paddle 20 having a large number of paddles 20a provided in parallel with the horizontal axis of rotation and a driving means for rotationally driving the paddle 20a. And a large number of paddles 2 radially provided on the vertical axis of rotation, as shown in FIG.
A representative one is an oil collecting paddle 21 having 1a and a drive means for rotating the oil collecting paddle 21.

The oil collecting means 22 using the oil fence 22a comprises, as shown in FIG. 7, an oil fence 22a surrounding the water area in front of the oil collecting port 4 and a winding device 22b for winding the oil fence 22a. By winding the oil fence 22a with the take-up device 22b, the oil fence 22a
Is narrowed down and the oil in the box is fed to the oil collecting port 4.

Thus, the oil collecting device 20, 21 or 22
When equipped with, it is possible to collect a larger amount of oil with respect to the traveling speed, and also it is possible to collect oil even when the oil collecting work boat is stopped.

Although the oil collecting arm 6 is provided in the above description, the oil collecting arm 6 is not essential to the present invention and can be omitted.

[0059]

As described above, according to the oil collecting work vessel of the present invention, the oil collecting tank having the side wall and the bottom surface is provided inside or outside the hull, and the upper end of the side wall is higher than the water line. In addition to being located, the bottom surface is located deeper than the oil / water boundary line, which is lower than the water line, and a part of the side wall is provided with an oil collecting port that opens near the oil / water boundary line. From the mouth, almost only the oil layer flows into the oil collecting tank and is collected. Therefore, oil can be collected with high efficiency in a short time with a small number of workers.

In the present invention, particularly when the oil collecting port is opened in the bow direction, the oil can be made to flow into the oil collecting port due to the dynamic pressure of the oil layer along with navigation, so that the oil can be recovered more efficiently. be able to.

Further, particularly when the oil collecting port is opened in the bow direction and an oil guide passage is formed which spreads from the oil collecting neck toward the bow direction, oil is supplied from a wider area than the opening width of the oil collecting port. Since the oil can be recovered, the oil can be recovered more efficiently.

Further, in the case of providing this oil guide passage, if the inlet of the oil guide passage is opened wider than the ship width, it is possible to prevent the hull from being contaminated by the oil layer, and the hull moves to cause secondary pollution. It is possible to prevent the contaminated water area from expanding due to the occurrence of.

Further, in the present invention, a large number of paddles provided parallel to the horizontal axis of rotation, or an oil collecting paddle provided with a large number of paddles radially provided on the vertical axis of rotation, or a water area in front of the oil collecting port. When an oil collecting means is provided that includes an oil fence that surrounds the oil fence and a winding device that winds the oil fence, and the upper oil layer is fed from the oil / water boundary line to the oil collecting port or oil guide passage, the oil collecting port In addition to being able to guide the oil with even higher efficiency, the oil can be recovered with even higher efficiency, and the oil can be guided to the oil collecting port and recovered even when the ship is stopped.

Further, in the present invention, the oil collecting tank is provided so as to be movable up and down with respect to the hull, and the height of the oil collecting tank with respect to the hull is adjusted so that the lower edge of the oil collecting port can be adjusted to the oil-water boundary line. Or by fixing the oil collecting tank to the hull, the lower edge of the oil collecting port is composed of a movable weir that can be raised and lowered, and by adjusting the height of the movable weir with respect to the hull and the oil collecting tank, The height of the lower edge of the oil collecting port can be adjusted to the oil / water boundary line, or the oil collecting tank is fixed to the hull, and a water tank for diffusing water is provided in the hull. If the height of the lower edge of the oil collection port can be adjusted to the oil-water boundary line by adjusting the height of the water hull line of the hull and the oil collection tank by adjusting the The lower edge of the oil collecting port for the water drainage line can be adjusted to the oil-water boundary line in order to prevent the oil layer from remaining and excess water. Flow into the oil tank can be effectively prevented, it is surely, moreover, efficiently oil recovery. Further, among these, particularly when a movable weir is provided, the structure is simpler than other means, and the cost can be further reduced.

Furthermore, in the present invention, when the drainage means is connected to the bottom of the oil collecting tank, the amount of oil that can be collected in the oil collecting tank can be increased by forcibly eliminating the water accumulated at the bottom of the oil collecting tank. is there.

In addition, when a sensor for detecting that the oil / water boundary line in the oil collecting tank has fallen below a predetermined height is provided, there is a risk that water in which oil has diffused is discharged from the bottom of the oil collecting tank. It is possible to prevent the discharge of oil-diffused water from the bottom of the oil collecting tank by taking appropriate measures such as stopping forced drainage, stopping oil aging due to ship stoppage, etc. ..

In addition, in the present invention, a plurality of oil collecting tanks are provided, and one oil collecting tank is provided with an oil collecting port,
The upper part below the oil collecting port of the oil collecting tank and the upper part below the oil collecting port of the other oil collecting tank are sequentially connected by an oil pipe, and the bottom parts of the respective oil collecting tanks are sequentially connected by a water pipe, If a drainage means is provided at the bottom of the final oil collecting tank, the oil and water can be reliably separated even if a large amount of oil is allowed to flow into the first oil collecting tank in a short time, and the oil is drained from the drainage device. It is possible to prevent the diffused water from being discharged.

Further, in this case, by providing a sensor for detecting the oil-water boundary line in the next oil collecting tank, the water in which the oil has diffused is discharged from the bottom in the oil collecting tank. It is possible to prevent the discharge of oil-diffused water from the bottom of the oil collection tank by taking appropriate measures such as stopping forced drainage.

In addition, in the present invention, particularly when an oil tank for storing the oil collected from the upper part of the oil collecting tank is provided, the amount of oil that can be collected by transferring the oil collected in the oil collecting tank to the oil tank is set. It can be increased, and the frequency of transferring the recovered oil to the outside of the ship can be reduced.

[0070]

[Brief description of drawings]

FIG. 1 is a central vertical cross-sectional view of an oil collecting work boat according to an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of a water collecting work boat according to an embodiment of the present invention across a waterline.

FIG. 3 is an explanatory view of another means for adjusting the position of the lower side edge of the oil collection port of the present invention.

FIG. 4 is an explanatory view of another means for adjusting the position of the lower edge of the oil collecting port of the present invention.

FIG. 5 is a side view of the oil collecting means of the present invention.

FIG. 6 is a plan view of another oil collecting means of the present invention.

FIG. 7 is a plan view of another oil collecting means of the present invention.

[0071]

[Explanation of symbols]

 1 Hull 1a Left hull 1b Right hull 2 Primary oil collecting tank 2a Side wall 2b Bottom surface 3 Secondary oil collecting tank 4 Oil collecting port 5 Oil guide path 7 Movable weir 8 Water tank 11 Oil pipe 12 Water conduit 13 Check valve 14 Drainage device 17 Sensor 19 Oil Tank 20 Oil Collection Paddle (Oil Collection Means) 20a Paddle 21 Oil Collection Paddle (Oil Collection Means) 21a Paddle 22 Oil Collection Means 22a Oil Fence 22b Winding Device O Oil Layer OL Oil Water Separation Line W Ship Width WL Waterline

Claims (15)

[Claims] 1. An oil collecting tank having a side wall and a bottom surface is provided inside or outside the hull, the upper end of the side wall is positioned higher than the water-drain line, and the bottom surface is lower than the water-drain line. An oil collecting work boat characterized in that the oil collecting port is located deeper than the above, and an oil collecting port that opens in the vicinity of the oil-water boundary line is provided in a part of the side wall. 2. The oil collecting work vessel according to claim 1, wherein the oil collecting port is opened in the bow direction. 3. The oil collecting work vessel according to claim 1, wherein the oil collecting port is opened in the bow direction, and an oil guide passage is provided which spreads from the oil collecting port toward the bow direction. 4. The oil collecting work vessel according to claim 3, wherein the inlet of the oil guide passage is opened wider than the width of the vessel. 5. The oil collecting port or the oil guiding passage is also provided with oil collecting means for feeding the upper oil layer from the oil / water boundary line.
Oil collection work vessel according to any one of. 6. An oil collecting paddle in which the oil collecting means is provided in parallel with a horizontal axis of rotation or a plurality of paddles radially provided in a vertical axis of rotation, and a drive device for rotationally driving the paddle. The oil collecting work ship according to claim 5, further comprising: 7. The oil collecting work vessel according to claim 5, wherein the oil collecting means includes an oil fence surrounding the water area in front of the oil collecting port, and a winding device for winding the oil fence. 8. An oil collecting tank is provided so as to be movable up and down with respect to the hull,
The oil collecting work vessel according to any one of claims 1 to 7, wherein the lower edge of the oil collecting port can be adjusted to an oil / water boundary line by adjusting the height of the oil collecting tank with respect to the hull. 9. An oil collecting tank is fixed to a hull, and a lower edge of the oil collecting port is composed of a movable weir capable of moving up and down. By adjusting heights of the movable weir with respect to the hull and the oil collecting tank, The oil collecting workboat according to any one of claims 1 to 7, wherein the height of the lower edge of the oil port can be adjusted to the oil-water boundary line. 10. An oil collecting tank is fixed to a hull, a water tank for adjusting water is provided in the hull, and the height of the water line of the hull and the oil collecting tank is adjusted by adjusting the amount of water stored in the water tank. The oil collecting work vessel according to any one of claims 1 to 7, wherein the height of the lower edge of the oil collecting port can be adjusted to the oil-water boundary line. 11. The oil collecting work vessel according to claim 1, wherein a drain means is connected to the bottom of the oil collecting tank. 12. The oil collecting work vessel according to claim 1, wherein the oil collecting tank is provided with a sensor for detecting that the oil-water boundary line in the tank has dropped below a predetermined height. 13. An oil collecting tank having a plurality of tanks is provided, and one oil collecting tank is provided with an oil collecting port, and the upper parts of the oil collecting tanks and the other oil collecting tanks are sequentially communicated with each other by an oil passage pipe below the oil collecting port. At the same time, according to any one of claims 1 to 12, wherein the bottoms of the respective oil collecting tanks are sequentially communicated with each other through water passages, and a check valve is interposed in each water flowing pipe, while a drainage means is provided at the bottom of the final oil collecting tank. Oil collection work ship described. 14. The oil collecting work vessel according to claim 13, wherein a sensor for detecting an oil-water boundary line in the tank is provided at the bottom of the final oil collecting tank. 15. The oil collecting work vessel according to claim 1, further comprising an oil tank for storing oil recovered from an upper portion of the oil collecting tank.