JPH0779845B2 - Sea water curtain device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a marine water curtain device used for promoting diffusion of gas leaking from a ship or the like to the sea, blocking it, and reducing radiant heat when flammable gas is ignited. It facilitates installation work at the leak site.

[Conventional technology]

When a large amount of combustible gas such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG) or toxic gas is required, marine transportation by ships is often performed.

If a ship transporting a large amount of such gas causes a disaster such as a collision, the gas being transported may leak to the sea. If there is a danger of explosion or fire, or if it is a toxic gas, it may deteriorate the surrounding environment and cause personal injury, so some measures are required.

[Problems to be solved by the invention]

As a device for blocking the diffusion of such gas or promoting diffusion to the sky, a device for forming a water curtain may be installed in advance on land.

However, in the case of a ship disaster, the place of occurrence is not constant,
Moreover, since it is on the sea, it is not possible to fixedly install the water curtain device in advance on the sea in anticipation of a disaster.

In addition, if you try to form a water curtain on the sea so as to surround the entire facility where there is a risk of gas leaks, such as on land, it will become a long device at least twice the length of the ship, and you will have to go to the disaster location. There are many problems in terms of workability and economics such as transportation and installation.

Further, when a device for forming a water curtain of a certain length is used, the outflow direction of gas often changes due to changes in weather conditions such as wind direction and tidal current at a disaster site, and it is necessary to be able to cope with this.

In addition, a device that forms a water curtain is often installed while the gas is diffused, and it is necessary to prevent it from causing a secondary disaster such as an ignition source.

The present invention has been made in view of the problems of the prior art, and effectively blocks gas leakage at an unspecified location on the sea or promotes upward diffusion to minimize a dangerous area. The present invention aims to provide a safe and easy-to-install sea water curtain device that can cope with changes in the outflow direction of gas.

[Means for solving problems]

In order to solve the above problems, the sea water curtain device of the present invention,
Installed a water curtain tube equipped with a plurality of water curtain nozzles to form a water curtain by supplying pressurized water along the upper surface of an explosion-proof structure that floats stably on the sea surface, and supplies pressurized water to the floating body. It is characterized in that a pressurized water supply device and a moving device that moves the floating body according to changes in the gas flow are mounted.

[Action]

A floating body with an explosion-proof structure is stably floated on the sea surface, and a water curtain tube is attached on it.The water curtain is formed by the fountain from the nozzle for the water curtain on the upper surface of the water curtain tube. A pressurized water supply device such as a water pump necessary for formation and a moving device such as a thruster that moves a water curtain according to changes in gas flow are housed in a floating body to prevent a disaster such as a fire from occurring, and at the site. The water curtain can be immediately formed simply by towing or self-propelling, and the installation work is facilitated.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in the schematic configuration in FIG. 1, the sea water curtain device of the present invention is installed at a certain distance on the leeward side of a gas flow 3 leaking from a leaking part 2 of a ship 1 at a right angle to the gas flow 3. The water curtain 4 having a length of about 160 m and a height of about 20 m is formed corresponding to the width of the gas flow 3.

For this reason, for example, as shown in FIG.
Is equipped with an explosion-proof sealed structure with a length of about 160 m, and its upper part slightly protrudes above the sea surface and floats stably.

A water curtain 12 is provided on the upper surface of the floating body 11 along the longitudinal direction thereof.
Is installed. A large number of water curtain nozzles 13 are attached to the water curtain tube 12 at regular intervals, and a water curtain 4 having a height of about 20 m is formed by spraying water upward.

Further, inside the floating body 11, a water pump 14 is mounted as a pressurized water supply device for supplying pressurized water to the water curtain 12, and is driven by a motor 15. Electric power to the motor 15 is shown in FIG. It is supplied from the support vessel 5 shown via a cable 6.

Further, thrusters 16 are mounted on both ends of the floating body 11 as moving devices for moving the floating body 11, respectively, and a screw 17 driven around a horizontal axis is swung about the horizontal axis around a vertical axis to arbitrarily rotate the screw 17. The driving force can be obtained in the direction, and like the water pump 14, it is driven by the electric power supplied from the support ship 5 through the cable 6.

In the sea water curtain device 10 thus configured, when a disaster occurs in the ship 1, the ship is towed by the support ship 5 to move to the vicinity of the disaster site, and then the thruster 16 is driven by the electric power supplied via the cable 6. , Is installed on the leeward side at a certain distance from the leakage section 2 and at a right angle to the wind direction.

After the water curtain tube 12 is thus installed at a predetermined position, the water pump 14 is driven by the motor 15 and the water curtain nozzle 12 sprays water through the water curtain tube 12 to form the water curtain 4.

Then, the gas flow 3 is blocked by the water curtain 4 in the leeward direction in the horizontal direction, and promoted in the upward direction,
While preventing the danger of explosion due to flammable gas,
Environmental deterioration due to toxic gas is prevented.

On the other hand, the outflow direction of the gas may change due to the tidal current or the wind direction. In this case, the thruster 16 mounted on the floating body 11 is adjusted by the remote control from the support ship 5 to adjust the wind direction at a certain distance on the leeward side. And the position of the ship 1 and the position of the floating body 11 are detected by a radar, a radio range finder, etc., and the wind direction is detected by an anemoscope, and the thruster 16 is adjusted based on these detection signals. It can also be controlled automatically.

In addition, with this sea water curtain device 10, a water curtain for disaster prevention can be easily formed simply by towing and installing the floating body 11.
Since it has an explosion-proof structure, it does not become a source of ignition, even if it is installed in a flammable gas, and there is no risk of secondary disaster.

Next, another embodiment of the present invention will be described with reference to FIGS.

This sea water curtain device 20 is equipped with three-part floating bodies 21, 22, and 23 to facilitate standby storage and save space, and the water curtain 4 having a predetermined length is formed in a line. To do.

A water curtain tube 25 having a large number of water curtain nozzles 24 mounted at fixed intervals is installed on each of the floating bodies 21, 22, and 23.

Further, each of the floating bodies 21, 22 and 23 has an explosion-proof structure, a water pump 26 as a pressurized water supply device is mounted, and is connected to a water curtain pipe 25, respectively.

Further, a thruster 27 as a moving device for changing the position of the water curtain 4 is mounted in the center of each floating body 21, 22, 23, and the screw 28 is swiveled around a vertical axis to change the propulsion direction. Is able to.

The engines 29 and 30 are used to drive the water pump 26 and the thruster 27, and a fuel tank and an air cylinder are mounted so that the engines 29 and 30 can be operated in an explosion-proof sealed state. .

In the sea water curtain device 20 configured as described above, the three floating bodies 2 are provided during standby and during towing, as shown in a plan view in FIG.
The total length is reduced to 1/3 with 1,22,23 side by side. Then, in this state, tow the ship to the vicinity of the disaster site, change the arrangement in a line with the thrusters 27 of each floating body 21, 22, 23, and extend the floating body to the state shown in FIG. It is installed at a position that is perpendicular to the gas flow 3 on the lee side for a certain distance.

After this, start the engine 29 that drives the water pump 26,
Pressurized water is supplied to the water curtain nozzle 24 through the water curtain pipe 25 to form the water curtain 4 having a height of about 20 m, for example.

When the direction of the gas flow 3 changes, the three floating bodies 21,22,
This can be achieved by remotely controlling the thrusters 27 of 23, or by automatically controlling the detection signals by position detection and wind direction detection.

According to this sea water curtain device 20, since the engines 29, 30 for driving the water pump 26 and the thruster 27 are mounted in the floating bodies 21, 22, 23, respectively, the underwater portions of the floating bodies 21, 22, 23 are large. The fluctuation of the floating body can be reduced, and the water curtain 4 can be installed in a stable state.

Also, depending on the size of the gas flow 3 from the leaking part 2 of the ship 1, it is not necessary to use three floating bodies 21, 22, 23, and the length of the water curtain 4 can be changed according to the scale of the disaster. It is possible to save energy.

In each of the above-mentioned embodiments, the floating body is towed up to the disaster site, and the moving device such as a thruster is used to adjust the installation position.However, the floating body is equipped with a propulsion device capable of self-propelled, and a support ship is used. It is possible to eliminate the need for towing.

Further, the pressurized water supply device and the moving device are not limited to those described in the above embodiment, and may be of other types. When driven by an electric motor, a battery or an engine-driven generator is installed in the floating body. It is also possible to eliminate the need for external power supply.

Furthermore, the number of floating bodies of the water curtain apparatus is not limited to one or three, and any number may be used.

〔The invention's effect〕

As described above in detail with the embodiment, according to the sea water curtain device of the present invention, the water curtain tube having the water curtain nozzle is mounted on the floating body of the explosion-proof structure, and the pressurized water supply device is attached to the floating body. Since it is equipped with a moving device, the underwater portion of the floating body is large, the fluctuation is reduced, a stable water curtain can be formed, and it is effective for blocking the gas flow and promoting diffusion.

In addition, the water curtain can be installed simply by moving the floating body, and can be easily towed or self-propelled. The position of the water curtain can be changed by the moving device, and even if the gas flow direction changes it can.

Furthermore, since the floating body has an explosion-proof structure, the influence of the operation of the pressurized water supply device and the moving device does not affect the outside, and it is possible to prevent the occurrence of a secondary disaster and it is safe.

Therefore, in the event of gas leakage at an unspecified location on the sea, a water curtain of a certain length can block the gas, promote upward diffusion, or block the heat from a fire, thus minimizing the hazardous area. it can.

[Brief description of drawings]

1 and 2 relate to an embodiment of a water curtain device of the present invention. FIG. 1 is a perspective view of a schematic configuration, FIG. 2 is a front view, and FIGS. 3 to 5 are of the present invention. According to another embodiment,
3 and 4 are a front view and a plan view in a standby state,
FIG. 5 is a plan view of the expanded state. 1 ... Ship, 2 ... Leakage part, 3 ... Gas flow, 4 ... Water curtain, 5 ... Support ship, 6 ... Cable, 10,20 ... Sea water curtain device, 11, 21, 22,
23… Floating body, 12,25… Water curtain tube, 13,24, Water curtain nozzle, 14,26
… Water pumps, 15… motors, 16,27… thrusters, 17,28… screws, 29,30… engines.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshimitsu Araki 3-1-1, Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Ltd. Tokyo Second Factory (72) Inventor Toshio Kamata 3-chome, Toyosu, Koto-ku, Tokyo No. 15 Ishikawajima Harima Heavy Industries Co., Ltd. Tokyo Second Factory (72) Inventor Mitsuo Watanabe 3-1-15-1 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Tokyo Second Factory (72) Inventor Kunihiro Miyashita Tokyo 3-1,15 Toyosu, Koto-ku, Ishikawajima Harima Heavy Industries, Ltd. Tokyo Second Factory (72) Inventor, Hitoshi Miyagawa 3-2-1-16, Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries, Ltd., Toyosu General Office (56) Reference Reference JP-A-52-20587 (JP, A) Actually developed 54-27598 (JP, U)

Claims (1)

[Claims] 1. A water curtain tube having a plurality of nozzles for water curtain, which is supplied with pressurized water and forms a water curtain, is installed along the upper surface of a floating body having an explosion-proof structure that floats stably on the sea surface. A sea water curtain device comprising a pressurized water supply device for supplying pressurized water and a moving device for moving a floating body according to a change in gas flow.