JPS63242284A - Method for controlling position of sea water curtain apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention promotes the diffusion of flammable gases, poisonous gases, high temperature gases, etc. leaking from ships, and radiant heat 18 when flammable gases are ignited. This paper concerns a method for controlling the movement of a floating water boat device used for water aquatic activities, etc., to an optimal position, so as not to put the surrounding area in a dangerous situation.

[Conventional technology]

Flammable gases such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG) transported by sea by ships, or gases that contain toxic components, such as poisonous gases, may leak into the area due to disasters such as collisions. If there is a low temperature liquefied gas, rapid evaporation due to heat input from seawater etc. will cause the gas to diffuse, creating a risk of explosion or fire in a wide area, such as 4V,
Once a fire breaks out, high-temperature gas is often generated.

Furthermore, if toxic gases diffuse, the surrounding environment may deteriorate, resulting in a human disaster.

[The problem that the invention attempts to solve]

To prevent these dangerous gases from dispersing into the surrounding area and preventing thermal effects, devices that form a water boat, such as those used in low-strain liquid storage facilities on land, can be floated on the sea and used for disaster prevention. is possible.

However, attempting to set the water level all around the ship requires a lengthy device, which is undesirable from the viewpoint of workability and economy, such as transportation and installation to a disaster site.

For this reason, it is necessary to install water level devices only in areas where there is a risk of gas leakage.

However, at sea, the position of the ship and the direction of gas outflow change depending on wind direction and tidal currents, so there is a problem in that the water level device must be moved accordingly.

This invention has been made in view of the problems of the prior art, and aims to provide a method for controlling the position of a seawater level device that promotes the diffusion of gas leaking from a ship and allows it to be located at the appropriate location. be.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a position control method for a marine water curtain device, in which a marine water level device equipped with a moving means used for promoting or blocking the dispersion of gas leaked from a ship on the sea is controlled against a gas flow. When moving to the optimum position, the position J3 of the ship and the position of the offshore water mouth device are detected, as well as the wind direction, and these detection signals are used in 7. X-zuki sea water 1
The present invention is characterized in that the moving means is controlled so that the device 5 is located on the leeward side at a certain distance rIl from the leakage part of the ship and perpendicular to the wind direction.

[For production]

A floating body with a thruster, a tugboat, etc. is installed at least on both ends of the marine water level device as a means of movement, and the position of the vessel with the leakage part is detected by radar etc., and the t/j clean water 9''IS
! ! : Detect the location of the location using a radio range finder, etc., and
The direction is detected using a wind vane, etc., and based on the detection results of these positions and wind direction, the direction of sea water is 5. In this way, the amount and direction of movement of the moving means are determined and controlled, and a sea water level device of a certain length can provide complete disaster prevention.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described based on the drawings.

The offshore water outlet device to which the control method of the present invention is applied is, for example, as shown in FIG. It is used to promote gas flow and cut off gas flow, and is towed by a support vessel 15 and moved to the site, or self-propelled to the site. It is equipped with a moving means 16 so that the installation position can be changed, and is composed of, for example, two thrusters after na.

A specific example of the structure of this marine water device 20 is shown in the third section.
As shown in the figure, a water pipe 22 is installed on a long floating body (pontoon) 21 with a sealed explosion-proof structure floating on the sea.
A large number of water ζ11 nozzles 23 are installed at regular intervals in this water pipe 22.
is installed.

Furthermore, a water pump 24 is mounted inside the floating body 21, and a motor is driven by electric power supplied from the support vessel 15 through a power cable 17.

Furthermore, a thruster 25 is provided at both ends of the floating body 21 as a moving means 16 for changing the position of the offshore water level device 20, and a thruster 25 is provided as a moving means 16 for changing the position of the offshore water level device 20. By turning with a motor, it is possible to obtain propulsive force in any direction.

In such a marine water level device 20, the length of the floating body 21 is, for example, about 150 TrL, and the floating body 21 has an integral structure as shown in FIG. 3, or a divided structure in which a plurality of floating bodies are connected.

Next, a control method necessary for making this marine water level device 20 function effectively at all times will be explained.

The control contents of the marine water curtain 7120 are mainly the following three things.

That is, ■ a certain distance PJt from the leakage part 12 of the ship 11;
(1) to hold it perpendicular to the wind direction; and (2) to hold it in a straight line in the case of a connected structure floating body 21. For example, as shown in FIG. Even if it changes to △, B, or C, the improvement water boat device f (20
Move to the specified position X.

Install at Y and Z.

In this kind of control, it is necessary to accurately determine the position of the ship 11, the sea water g, and the position of the head 20, and as shown in FIG. A wave radar 31 is mounted, and a main station 32a of a radio range finder is installed at both ends of the TLRJ Josui-11 device 20.

33a is attached, and a follower station 32b is attached to the support ship 15.

33b is installed.

Detection signals from the radars 31 J3 and J: and the slave stations 32b and 33b of the radio range finders are input to a control host computer 34 mounted on the support ship 15.

Further, the marine starch syrup device 20 is provided with a wind vane 35,
The detection signal is transmitted to the control board 36 and optical modem 37
The data is sent to the support ship 15 via an optical fiber cable 38, and is input to the host computer 34 via three optical modems.

Roughly speaking, the marine water F5 device 20 is equipped with an electric hydraulic servo mechanism that can detect and adjust the turning angles 0 and θ2 degrees of the two thrusters 25 as the moving means 16, and the rotation speed of the screw 26. n1゜n2. can be detected and adjusted from the inverter, and is connected to the host computer 34 via the control board 36.

In addition, a controller for the water pump 2/I is connected to the control board 36 of the marine water curtain device 20, and controls the start/stop of the water pump 2/I. Tension between α and pontoons - [
, Furthermore, a signal from a gyro 40 that determines the basis for measuring angular marks is input, and the turning angle θ and rotation speed n corresponding to the added thruster are also input, and the control υ11 is input.
be done.

On the other hand, the host computer 34 of the support ship 15 has a disk unit 41 for storing programs and the like, and a printer 42. A keyboard 43 (t3) and a cathode ray tube 44 for display are connected, as well as a manual operation panel 45 for manual operation, so that commands, etc., can be issued.

The concrete control of the marine starch syrup device 20 by such a control system is as shown in FIG.
After the marine starch syrup device 20 is moved (self-propelled or towed) to the vicinity of the leakage point 1, a command to start control is given from the keyboard of the host computer 34 of the support vessel 15.

Then, the position of the marine water i, 1 device 20 is detected by the two radio range finders 32a, 32b and 33a, 33b, and the position Vt of the ship 11 that cannot be approached due to danger etc. is detected by the radar 31. The wind direction is detected by the wind vane 35.

For these detection signals! At the same time, the host computer 34 displays the current relative position of the ship 11 and the marine water curtain device 20 on the cathode ray tube 44 or outputs it to the printer 42, and at the same time displays the current relative position of the ship 11 and the marine water curtain device 20 at right angles to the wind direction at a set distance input from the keyboard 43. The turning angles θ, θ of the thruster 25 to
and the rotation speed nl, n2, control board 3
A control signal is output to each thruster 25 via 6.

After the marine starch syrup device 20 is thus set at the predetermined initial position, a start signal is sent to the water pump 24 to start up the water $514, and the water front 14 is formed.

After this, distance maintenance control is performed so that the distance 111L between the water boat 14 and the ship 11 is always constant, but in this control as well, the position of the ship 11 and the marine water mouth device 20 are controlled as in the initial position setting control. Find the distance between the ship 11 and the marine starch syrup device 20 from the position of Turning angle θ1
゜θ2 and rotation speed n1. It is output as a control signal for n2.

Here, the distance is constant in principle, but the Mizunishiki device 2
If 0 is too close to vessel 11 and there is a risk of collision,
Needless to say, there is no need to change the distance.

Even if the ship 11 and the marine starch syrup device 20 are washed away due to the influence of tides or wind direction, both can be maintained at the set distance ML, and the water can function effectively, and the ship
1 and sea water level equipment'? Collision with 120 is prevented, and no secondary disaster occurs.

Next, when the floating bodies (pontoons) 21 of the number of phases have a connected structure, control 2II is performed to maintain a linear arrangement so that they do not become bent.

The control for maintaining this linear arrangement should be performed by moving the thruster of each pontoon or the necessary thruster 25 so that the angle α becomes a straight line based on the angle α between the pontoons and the detection signal of the gyro 40 which is the reference for this angle α. The amount is output as a control signal of the turning angle θ and the rotation speed n.

Also, based on the detection signal under tension between each pontoon, consideration is given to preventing the water from being separated due to the application of a large force between the pontoons when controlling a11 to maintain the linear arrangement.

These distance maintenance and straight line arrangement maintenance controls are repeatedly performed for a predetermined set time T, for example, Tm2O3 seconds, but in situations where changes in wind direction or tidal current occur in a short period of time, the set time T may be shortened. However, if there are few changes in wind direction or tidal current, the set time T can be made longer.

In this way, when the set time T has elapsed, the water line 14 is maintained so that it is always at right angles even if the wind direction changes.
Performs control to maintain vertical orientation.

In this control, the detection signal from the wind vane 35 and the
And from the position detection signal of the marine water F11 device 20, the direction connecting both end positions of the marine bearing device 20 is on a line perpendicular to a direction parallel to the direction of the tumor 1 passing through the leakage portion 12 of the ship 11. The angle with respect to the current direction of the marine water C,1 device 20 is determined by the drawings of the computer 34 from the computer 34, and the thruster 25 necessary to correct this angle is determined.
The amount by which the thrusters should be moved is determined by n and outputted to the thruster 25 as turning angles θ and θ2 and rotational speed n1°n2 for control.

When each control is performed in this manner, the water F, ) 14 is always located at a certain distance 111111- on the leeward side from the leakage part 12 of the vessel 11, and is perpendicular to the wind direction, even under the influence of river direction, tidal current, etc. It will be installed.

After this, the timer for the control time T is reset, and each control is repeated until a command to end the work is input, and the command to end the work causes the water pump 24 for forming the water pump 14 to stop. A signal is output and all control ends.

If manual operation becomes necessary during these controls, an interrupt command or the like is issued from the manual operation panel 45 on the support vessel 15 side to control the marine watercraft device 20 to a desired state.

By using the offshore water tank device 20 whose position is controlled in this way, for example, if LNG leaks into the ocean, the gas that has rapidly evaporated due to heat input from seawater, etc. will tend to spread over a wide area, and the Although a dangerous situation with a high δ': i degree occurs, the water curtain 14 blocks the horizontal diffusion of evaporated gas and promotes upward diffusion, minimizing the dangerous range. be able to.

In the above embodiment, the case where the boss 1 to the computer etc. for controlling the marine water seedling device was installed on the support ship was explained, but they may also be installed on the marine support device itself. , Just like conventionally used oil booms, ships can be equipped with marine watercraft equipment, computers, etc., and in the unlikely event of an emergency, they can be used floating on the sea.In this case, The position of a ship can be known even without a ship position detecting means such as a radar.

In addition, the types of offshore water systems that are subject to control are not limited to those that use pontoons along their entire length as floating bodies; It may be possible to attach a buoyancy body such as urethane to connect floating bodies on the sea with a means of movement, and a small boat or the like may be used as the floating body equipped with means of movement.

〔Effect of the invention〕

As described above in detail with one embodiment, according to the method for controlling the position of a marine water level equipment of the present invention, the position of a marine water level equipment equipped with a moving means, the position of a ship, and the wind direction are detected, Based on these detection signals, the moving means is controlled so that the sea-hi water boat device is located on the leeward side of the ship at a certain distance and perpendicular to the wind direction, so the position of the ship and the direction of gas flow are controlled. The water 6) can always be formed in the optimal position even if it changes depending on the wind direction or tidal current.

Therefore, without installing marine water valve devices around the entire circumference of the ship, it is possible to effectively shut off heat gas, etc. that promote gas diffusion with a device of a certain quality.

[Brief explanation of drawings]

1 to 5 show an embodiment of the method for controlling the position of a marine water device according to the present invention, FIG. 1 is a schematic plan view of the control state, and FIG. Schematic diagram of the device,
Figure 3 is a front view of if+5 Josui ψ5 head, Figure 4 is 11
The control method book, Figure 5, it, II 01+
This is floor 11 of the method. 11... Ship, 12... Leakage part, 13... Gas,
14...water), 15...support ship, 16...transportation means, 17...power cable, 20...maritime water n
Device, 21... Floating body, 22... Water pipe, 23...
Water sieve nozzle, 24... Water pump, 25... Thruster, 26... Screw, 31... Radar, 32a, 3
3a... Main station of radio range finder, 32b, 33b... Slave station of radio range finder, 34... Host computer, 35
...Wind vane, 36...Control board, 37.
39... Optical modem, 38... Optical fiber cable,
40... Gyro, 41... Disk unit, 4
2...Printer, 13...Keyboard, /I/I・
...Cathode-ray tube, 45...Manual operation panel. 0.0 ... Thruster turning angle, n , n ・
・Rotation speed of the slusk.

Claims (1)

[Claims] To detect the position of the ship and the position of the marine water curtain device when moving and installing the marine water curtain device equipped with a moving means used to promote or block the diffusion of gas leaked from a ship at sea to an optimal position relative to the gas flow. A marine water curtain device that also detects the wind direction and controls a moving means based on these detection signals so that the marine water curtain device is positioned on the leeward side at a certain distance from the leakage part of the ship and perpendicular to the wind direction. position control method.