JPH0584182B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applied to a water-borne system used for promoting and blocking the diffusion of gas leaked from ships, etc. into the sea, lakes, marshes, rivers, etc., and reducing radiant heat when flammable gas ignites. This is a water curtain device that can be easily installed by being mounted on a ship and transported.

[Conventional technology]

Liquefied natural gas (LNG) and liquefied petroleum gas (LPG)
Ships are used to transport large quantities of gases such as flammable gases such as flammable gases and toxic gases containing toxic components, and are often transported by water.

If a ship transporting such gas has a collision or other disaster, the gas may leak onto the water, spreading highly concentrated flammable gas that poses a risk of explosion or fire over a wide area. Otherwise, toxic gases may spread, worsening the surrounding environment and causing human damage, so some kind of countermeasure is required.

[Problem that the invention seeks to solve]

On land, a device that forms a water curtain is used as a device to block the diffusion of such gas and promote its diffusion to the upper atmosphere.

However, in the case of a disaster on a ship, the location of occurrence is not fixed, and moreover, it is difficult to install a fixed location on the water.

In addition, if you try to form a water curtain on the water to surround the entire facility that is at risk of gas leakage, as is the case on land, the device will be more than twice the length of the ship, making it difficult to reach the disaster area. This is unfavorable from the viewpoint of workability such as transportation and installation, as well as economic efficiency.

The present invention has been made in view of the problems of the prior art, and it is an object of the present invention to provide an easy-to-transport floating water curtain device that can effectively block the diffusion of gas leaking on water and promote upward diffusion. That is.

[Means for solving problems]

In order to solve the above problems, the floating water curtain device of the present invention is a water curtain that is mounted on a ship and floats in a predetermined water area to block the horizontal flow of leaked gas flow and diffuse it upward. A floating water curtain device that forms a floating body, which includes a water curtain pipe to which a floating body is attached and is configured to be foldable or rollable to supply pressurized water, and a water curtain pipe that is attached to the upper part of the water curtain pipe so as to face upward. A plurality of water curtain forming nozzles capable of forming a water curtain in the direction of the length of the water curtain tube, and a water pump connected near an end of the water curtain tube to supply the pressurized water to the water curtain tube. It is characterized by being equipped with a mounted pontoon.

[Effect]

A water curtain pipe that is longer than the width of the gas flow leaking onto the water,
The entire structure is made up of flexible hoses, or rigid tubes are connected through flexible tubes so that they can be folded or rolled up and stored on board a ship, and floating bodies are attached to these water curtain tubes. It is made to float on the water surface, and a water curtain nozzle is attached to the top, and pressurized water is sent from a water pump mounted on a pontoon near the end of the water curtain pipe to form a water curtain by fountaining water upward. The water curtain is moved by transportation means such as a tugboat connected to both ends of the water curtain pipe or a pontoon with a thruster.
It is designed to be able to respond to changes in tides and wind direction.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

As shown in the schematic configuration in FIG.
The pipe is equipped with a water curtain pipe 11 that is longer than the width of the water curtain and floats on the sea surface, and is mounted on the deck of a special ship 12 in a folded state and transported to the vicinity of the leakage part 2 of the ship 1. A pontoon 13 with an explosion-proof structure is connected to one end of the water curtain pipe 11, and a water pump that supplies pressurized water for the water curtain 14 is installed inside. They are now powered by electric power. Further, both ends of the water curtain pipe 11 are connected to a private boat 12 or a tugboat 16, which are transportation means, via wires 17, and the position of the water curtain pipe 11 can be changed to change the installation position of the water curtain 14. It is now possible to change.

The detailed structure of such a floating water curtain device 10 is as follows.
As shown in FIGS. 2 and 3, multiple water curtain pipes 11 made of FRP (fiber-reinforced plastic) of a certain length are connected with flexible hoses 18 such as cloth hoses to reduce weight. It is approximately 160m long.

A floating body 19 filled with foamed urethane and having a rectangular cross section is attached over almost the entire length of each water curtain pipe 11 so as to cover the upper part of the water curtain pipe 11, so as to float on the sea surface. In the upper part of the water curtain pipe 11 floating on the sea surface,
A large number of water curtain nozzles 20 that open upward at regular intervals are installed, penetrating the floating body 19 and protruding upward.

When such a water curtain pipe 11 is used to block the gas flow 3 from the leakage part 2 of the ship 1 or promote upward diffusion, it is used in a straightly stretched state. Since speed is required for transportation to the destination, it is installed on a special vessel 12. As shown in Fig. 4, a flexible hose 18 such as a cloth hose is bent to connect the water curtain pipe 11. Folded into parallel rows.

When loading onto the special ship 12, as shown in FIG.
7 is wound up on a winding drum 21, a pontoon 13 equipped with a water pump connected to one end of the water curtain pipe 11 is placed on the back side, and the water curtain pipe 1 is folded up.
1 is placed on the rear end (stern) of the private vessel 12, and can be easily installed by pulling out the water curtain pipe 11 from the other end with a tugboat 16 and floating it on the sea surface. It's getting old.

Therefore, in the floating water curtain device 10 configured as described above, the water curtain pipe 11 is installed in a folded state on the private boat 12, and
After transporting the water curtain pipe 11 to the vicinity of the gas flow 3 leaking from the leakage part 2 of
6 in the opposite direction to float each water curtain pipe 11 and pontoon 13 on the sea surface and stretch them in a straight line.

After this, as shown in FIG. 1, the water curtain pipe 11 is moved by the special boat 12 and the tugboat 16 to a position on the leeward side at a certain distance from the leakage part 2, at right angles to the wind direction, and in a position that blocks the gas flow 3. The water curtain 14 is adjusted, starts the water pump, sends pressurized water into the water curtain pipe 11, and sprays water from the water curtain nozzle 20 to form a water curtain 14 with a height of about 20 m and a length of about 160 m.

As a result, the diffusion of the gas flow 3 to the leeward side in the horizontal direction is blocked, and the upward diffusion is promoted by the water curtain 14. It has been confirmed that
The area where there is a risk of explosion or fire due to flammable gas can be minimized, and environmental deterioration due to toxic gas can also be minimized. In addition, the pontoon 1 near the water curtain pipe 11
Since pressurized water is sent by the water pump provided in step 3, flow path loss is small and pump water pressure can be used effectively.

Furthermore, even if the private boat 12 or the tugboat 16 is located in a safe place far from the dangerous gas flow 3, a sufficiently high water curtain can be efficiently formed.

Next, another embodiment of the water curtain device of the present invention will be described in detail based on FIGS. 6 and 7.

The water curtain pipe 31 of this floating water curtain device 30 is composed of a single cloth hose, and is entirely flexible. Hollow hoses such as cloth hoses are attached to both sides of the water curtain pipe 31 as floating bodies 32 for floating the water curtain pipe 31 on the water surface, and air compressors or It is inflated with air supplied from an air cylinder, and its buoyancy keeps the water curtain pipe 31 floating above the sea surface.

A large number of water curtain nozzles 33 are installed upward at regular intervals on the upper part of the water curtain tube 31 which is floating on the sea surface.

When this water curtain pipe 31 is loaded onto a private vessel 12 or the like, it may be folded in a meandering state, or the water and air inside may be discharged and the
As shown by the two-dot chain line in the figure, it is folded flat, wound onto a winding drum, and mounted.

The water curtain pipe 31 thus loaded and transported on the special boat 12 is transported to the tugboat 1 as in the case of the above embodiment.
6 to the sea surface, air is sent to the floating body 32 to make it float, and after adjusting it to a predetermined position, a water curtain 14 is formed by a water pump.

By making the water curtain pipe 31 and the floating body 32 entirely flexible in this way, it is easy to mount it on a ship, the weight is light, and the workability is good.

In addition, in each of the above embodiments, a case was explained in which a private boat and a tugboat were used as transportation means.
If it is composed of ships, it may be two ships, and does not need to be a dedicated ship. If a ship is not used as a means of transportation, it is also possible to use two pontoons equipped with thrusters, adjust the position of the water curtain with the thrusters, and use the ship for only transportation.

Alternatively, instead of transporting the cargo on a small ship, it may be carried on a main ship (gas carrier), and in the event of a disaster, it can be taken off the ship and floated on the sea surface. A work boat on board is considered.

Further, the material of the water curtain tube is not limited to FRP or cloth, but may be other materials such as metal, and it is preferable that the material is not corroded by seawater or deteriorated as much as possible.

Furthermore, even if the disaster site is on a lake or river, the water curtain device of the present invention can be used.

〔Effect of the invention〕

As specifically explained above in conjunction with the embodiments, according to the present invention, the water curtain pipe, which is longer than the width of the gas flow leaking onto the water, is configured to be able to be stored on a ship, so that it can be carried on the ship to the disaster site. It can be easily transported and installed.

In addition, since the floating body is attached to the water curtain pipe so that it floats on the water surface, it can be easily installed by simply lowering it onto the water, and it can be maintained above the water surface at all times.

Furthermore, the position on the water surface can be changed using a moving means connected to the water curtain pipe, and the optimum installation position for the water curtain is to install it on the leeward side at a certain distance from the leakage point and perpendicular to the wind direction. In addition to visual control, the ship's position and the position of the water curtain pipe can be measured using a radio rangefinder, etc., and the wind direction can be measured using a wind vane.Based on these signals, the water curtain can be placed in the optimal position. It also becomes possible to automatically control transportation means.

Furthermore, since pressurized water is sent by a water pump installed in a pontoon near the end of the water curtain pipe, there is little flow loss and the pump water pressure can be used effectively.

Furthermore, a sufficiently high water curtain can be efficiently formed even if a private boat or tugboat is located in a safe location far from dangerous gas flows.

Therefore, even if gas leaks at an unspecified location on the water, it is possible to promote upward diffusion and block the diffusion onto the water surface, and to reduce radiant heat in the event of a fire.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the floating water curtain device of the present invention, in which Figure 1 is a schematic perspective view, Figure 2 is a front view of the water curtain pipe, Figure 3 is a cross-sectional view, and Figure 3 is a cross-sectional view. 4 is a perspective view of the loaded and stored state, FIG. 5 is a perspective view of the state of transportation by ship, and FIGS. 6 and 7 are front views and cross-sectional views of water curtain pipes according to other embodiments of the present invention. It is. 1... Ship, 2... Leakage part, 3... Gas flow, 1
0,30...Floating water curtain device, 11,31...Water curtain pipe, 12...Private ship, 13...Pontoon, 14
... Water curtain, 15 ... Cable, 16 ... Tugboat, 1
7...Wire, 18...Flexible hose, 1
9, 32... Floating body, 20, 33... Water curtain nozzle, 21... Winding drum.

Claims (1)

[Claims] 1 A floating water curtain device that is mounted on a ship and floated in a designated water area to form a water curtain that blocks the horizontal flow of leaked gas and diffuses it upward, and is equipped with a floating body. a water curtain pipe configured to be foldable or rollable and supplying pressurized water; and a water curtain pipe that is attached upwardly to the upper part of the water curtain pipe to form a water curtain in the length direction of the water curtain pipe. A floating water curtain comprising a plurality of nozzles for forming a water curtain, and a pontoon equipped with a water pump connected near the end of the water curtain pipe and supplying the pressurized water to the water curtain pipe. Device.