JP4192247B2 - Floating substance collection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a floating substance collection device for collecting floating substances such as oil and dust, and more particularly to a floating substance collection device that is very suitable for collecting oil and the like by towing with a tugboat or the like.
[0002]
[Prior art]
Oil fences are widely used to prevent and collect the oil that has flowed out onto the surface of the sea and other water surfaces. FIG. 8 shows an example of the configuration of a conventional oil fence. The oil fence 1 includes a float 2, a skirt 3 suspended from the float 2, and a tension member (for example, a wire rope) or ballast 4 provided at the lower edge of the skirt 3.
[0003]
[Problems to be solved by the invention]
When the oil fence is towed to collect oil or when the relative speed difference between the oil fence and seawater is large, such as in a sea area where the tidal current is high, the oil accumulated on the front side of the oil fence leaks as shown in FIGS. It becomes easy to do.
[0004]
That is, when oil is stopped by an oil fence under conditions of high towing speed and tidal current speed, the shear force generated at the boundary between water and oil becomes large, and oil droplets leak from the head wave as shown in FIG. Or, as shown in FIG. 10, oil droplets leak out due to a horizontal vortex in front of the fence.
[0005]
In addition, when the wave height of a wave with a short cycle on the sea increases, oil jumps over the oil fence (splash over), or oil droplets are generated and leaked in the sea in front of the fence.
[0006]
It is an object of the present invention to provide a floating substance collection apparatus that can quickly collect floating substances such as oil staying on the front side of an oil fence and can significantly reduce leakage of oil and the like.
[0007]
It is another object of the present invention to provide a floating substance collection device that can be towed at high speed and can significantly reduce the time for collecting oil and the like.
[0008]
[Means for Solving the Problems]
The floating suspended matter collection device of the present invention is provided with a fence that is towed or moored at a plurality of places different in the longitudinal direction, and a portion between the towed or moored places is arranged in a shape protruding to the downstream side of the water flow, A float collector disposed in an inner region of the protruding portion of the fence, the float collector being open to the lower side and the downstream side, the float collector A downward flow is generated in the floating material collector by the water flow flowing below, and a forward flow from the tail of the fence toward the floating material collector is generated .
[0009]
In such a floating substance collection device, for example, the fence extends so as to bulge to the downstream side by being towed by a towed ship. When water flows below the collector disposed inside the bulging area, a downward flow is generated in the collector, and in the fence inner area, a flow from the tail end side of the fence to the fence is generated. For this reason, floating substances such as oil collected by the fence are collected in the collector without staying near the tail end of the fence.
[0010]
By arranging a collecting device such as a gap or a pump in the collector, oil or the like can be collected and sent out.
[0011]
As this collector, a collector having a U-shaped horizontal section or a shape similar to the U-shaped cross section and a float for imparting buoyancy to the main body is suitable.
[0012]
As this fence, an oil fence is suitable. In addition, as a fence, you may consist of a hard body formed in the shape which protruded in the back flow side.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIGS. 1-5, the floating substance collection | recovery apparatus which concerns on embodiment is demonstrated.
[0014]
This floating floating material recovery apparatus is arranged in an oil fence 11 towed by a towed ship 10 such as a tug boat, a floating substance collector 12 arranged in an inner area of the oil fence 11, and an inner area of the floating substance collector 12. And a collecting device 13 such as a gap and a pump.
[0015]
The oil fence 11 is towed by two towed ships 10 via a mooring line 14 such as a wire rope, and extends in a substantially parabolic shape. The oil fence 11 may have a structure shown in FIG. 8, or may have a structure in which a sheet is stretched on a frame (frame body) made of FRP or the like.
[0016]
As shown in FIG. 3, the collector 12 is attached to a main body 12a having a substantially U shape (in addition to a U shape, a horseshoe shape or an arc shape) in a plan view shape, and an upper edge of the main body 12a. And float 12b. The main body 12a is made of, for example, plastic (including FRP), metal, or the like. The main body 12a may have a structure in which a sheet is stretched on a frame (frame body).
[0017]
The collector 12 is towed by the towed ship 10 through a mooring line 15. In this case, the collector 12 is towed so that the open side of the collector 12 faces rearward in the traveling direction. Note that the collector 10 and the oil fence 11 may be connected and integrated via a rod made of iron or the like instead of the mooring line 15, and in this way, it is less susceptible to the effects of wave sway. .
[0018]
The collector 13 such as a gap or a pump is connected to the collector 12 by a mooring line (not shown), for example. The recovery device 13 is connected to a hose (not shown) for sending recovered oil and the like.
[0019]
When the floating floating body recovery apparatus constructed in this way is towed in an oil spill area, the oil flows toward the tail of the oil fence 11 and then flows into the collector 12 as shown in FIG. It is collected by the vessel 13.
[0020]
That is, as schematically shown in FIGS. 4 and 5, the width of the collector 12 is relatively narrow, and a downflow is generated in the collector 12 by the ocean current flowing under the collector 12 (according to Bernoulli's theorem), and the oil fence 11 A flow (advanced flow) from the end of the head toward the collector 12 occurs. On this forward flow, oil or the like flows from the tail side of the oil fence toward the collector 12.
[0021]
When a conventional oil fence is towed, all of the oil and the like is collected at the tail end of the oil fence, so that the oil layer thickness at the tail end of the oil fence increases, and the oil and the like easily leak from the tail of the oil fence. On the other hand, in the present invention, as shown in FIG. 4, oil or the like flows U-turn from the very front side of the tail end of the oil fence and flows toward the collector 12, and the oil layer thickness at the tail end of the oil fence is extremely small. There is almost no leakage of oil from the vicinity of the tail end of the oil fence.
[0022]
In a normal oil fence, oil begins to leak when the towing relative speed reaches 0.75 knots, but in the present invention, almost no oil leakage was observed even at a towing relative speed of 5 knots.
[0023]
In the embodiment of FIGS. 1 to 5, the collector 13 is installed. However, when the amount of recovered oil is small and all the recovered oil can be stored in the collector 12, the collector 13. May be omitted.
[0024]
Even when the collector 13 is installed, in the present invention, the collector 13 is disposed in the collector 12 and is separated from the oil fence 11, so that the collector 13 contacts the oil fence 11 and the oil fence 11. Is not separated. (Note that in the case of a conventional oil fence, the recovery device is disposed close to the oil fence, so that the recovery device may come into contact with the oil fence and damage the oil fence.) The durability of the fence will also be improved.
[0025]
In the embodiment of FIG. 1, the mooring line 15 of the collector 12 is connected to the mooring line 14, but it may be connected to the towed ship 10 or may be connected to the oil fence 11 as shown in FIG. 6.
[0026]
Further, when the collector 13 is towed directly by the towed ship 10 as shown in FIG. 7, the collector 12 may be held by the collector 13. In FIG. 7, a boom 16 extends laterally from one tow vessel 10, and a collector 13 is connected to the boom 15 via a mooring line 17.
[0027]
In the above embodiment, a total of two places at both ends in the longitudinal direction of the oil fence are towed, but three or more places may be towed. For example, when three places are towed, two parabolic bulge areas are generated, and a collector is arranged in each bulge area.
[0028]
In the above embodiment, the oil fence is towed. However, the fence may be moored in a sea area, a lake, or a river with a relatively large tidal current.
[0029]
In the present invention, the fence may be formed into a shape projecting to the downstream side like 11A of the fence of FIG. Other configurations in FIG. 11 are the same as those in FIG. 1, and the same reference numerals denote the same parts.
[0030]
The collector may have the shape shown in FIGS. The collector 12A of FIG. 12 has a shape in which the lower part is slightly smaller. The collector 12B of FIG. 13 has a shape in which both edges on the open part side are curved inward. The collector 12C of FIG. 14 is provided with a lid 21 at the lower part on the open side. The collector 12D in FIG. 15 is provided with a net 22 on the bottom surface portion.
[0031]
【The invention's effect】
As described above, according to the floating substance collection apparatus of the present invention, the floating substance such as oil can be collected at a high recovery rate without almost leaking. Moreover, the floating substance collection apparatus of this invention can also tow oil at high speed, and can collect oil etc. in a short time.
[Brief description of the drawings]
FIG. 1 is a plan view showing a floating substance collection apparatus according to an embodiment.
2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is a perspective view of a collector.
FIG. 4 is an operation explanatory diagram of the floating suspended matter recovery apparatus according to the embodiment.
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is a plan view of a floating substance recovery apparatus according to another embodiment.
FIG. 7 is a plan view of a floating substance recovery apparatus according to still another embodiment.
FIG. 8 is a perspective sectional view of a conventional oil fence.
FIG. 9 is a cross-sectional view showing an example of use of a conventional oil fence.
FIG. 10 is a cross-sectional view showing an example of use of a conventional oil fence.
FIG. 11 is a plan view of a floating substance collection apparatus according to a different embodiment.
FIG. 12 is a perspective view of a collector 12A.
13A is a plan view of the collector 12B, and FIG. 13B is a perspective view thereof.
FIG. 14 is a perspective view of a collector 12C.
FIG. 15 is a perspective view of a collector 12D.
[Explanation of symbols]
1 Oil Fence 2 Float 3 Skirt 10 Towing Ship 11 Oil Fence 12, 12A, 12B, 12C, 12D Collector 13 Collector 16 Boom

Claims (7)

A fence in which a plurality of places with different longitudinal directions are towed or moored, and a portion between the towed or moored points is arranged in a shape protruding to the downstream side of the water flow;
A float collector disposed in an inner region of the protruding portion of the fence;
The suspended solids collector, shape der which opens toward the lower side and the rear flow side downflow in the suspended matter in the collector is produced by water flowing through the lower of the suspended matter collector, the last of the fence water suspended matter recovery device you characterized in that the tail is intended to forward-flow towards the said floating substances collector occurs.   2. The floating substance collection apparatus according to claim 1, wherein the fence is an oil fence.   3. The floating substance collection apparatus according to claim 2, further comprising towing means for towing both longitudinal ends of the oil fence.   4. The floating substance recovery apparatus according to claim 1, wherein the collector includes a main body having a U-shaped horizontal cross section or a shape similar thereto. 5.   5. The floating suspended material recovery apparatus according to claim 4, wherein the collector includes a float that provides buoyancy to the main body.   6. The floating substance collection apparatus according to claim 1, wherein a collection device for collecting the floating substance is provided in an inner region of the collector.   The water-borne substance collection device according to claim 6, wherein the collection device is a gap or a pump.

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