JPH04297392A - Carbonic acid gas transport ship - Google Patents

Abstract

PURPOSE:To provide a carbonic acid gas transport ship capable of doing a job for dumping operation in standing severe oceanic weather conditions, by transporting carbonic acid gas, being produced by combustion of fuel or the like, up to an ocean where a depth of more than 3000m from the ground level is securable, in order to dump it after being liquefied without discharging it in the air for the purpose of preventing an earth warming tendency. CONSTITUTION:A liquefied storage tank 2, a flexible hose 3 and a hose winding reel 4 are mounted on a transport ship 1, and no facilities are installed in a dumping site, through which dumping operation is made so as to cope with severe oceanic weather conditions.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon dioxide gas transport ship.

0002

[Prior Art] In order to suppress the rise in the concentration of carbon dioxide gas in the atmosphere, which is considered to be a cause of global warming, carbon dioxide gas is recovered and sent to the deep sea without being released into the atmosphere. It is conceivable to store and fix it in the form of clathrates. The present invention relates to the process of transporting the recovered and liquefied carbon dioxide by sea and injecting it into the deep sea through a pipe. By the way, as of now, specific techniques regarding these are not yet known. A floating offshore oil production system is a similar technology from the perspective of transporting liquid by connecting the ocean and the sea or the seabed with conduits.First, the configuration and problems of that technology will be described below. That is, FIG. 3 shows an example of an offshore oil production system called a single-point mooring system. As shown in the figure, a tanker 10 with oil production equipment 17 mounted on the deck is connected to a buoy 12 by a mooring rope 11. , the buoy 12 is anchored to the seabed by an anchor chain 13. Marine oil passes through a riser pipe (oil lifting pipe) 15 from a submarine shaft 14, passes through the inside of a buoy 12, and is guided from a hose 16 to equipment 17 on the tanker. In this system, during stormy weather, the tanker 10 disconnects the mooring rope 11 and hose 16 and evacuates, leaving the riser pipe 15 together with the buoy 12 at the site. Figure 4 shows another example of an offshore oil production system using a semi-submersible (semi-submersible) offshore platform, where (a) is a side view and (b) is a plan view. In the figure, a platform 18 is moored by an anchor chain 13, and marine oil is guided from an undersea pit 14 through a riser pipe 15 to an oil production facility 17 on the platform. The produced oil (which has been depressurized and separated from gas) is transferred to a transport tanker 20 via a cargo hose 21 and transported to an onshore refining base or the like. The riser pipe 15 is suspended from a derrick 19 on the platform 18, and a tensioner device as shown in the side view of FIG. 5 is interposed between the riser pipe 15 and the derrick 19. That is, the upper end of the riser pipe 15 is suspended by a pair of left and right tensioner lines 22 to which a constant tension is applied by a weight 23, which prevents the entire riser pipe from sagging or flexing significantly. Platform 18 and riser tube 1
5. Relative vertical shaking of the upper end is absorbed to a certain extent. When the platform 18 is evacuated during stormy weather, the riser pipe 15 is pulled up and stored.

0003

[Problems to be Solved by the Invention] However, the offshore oil production system described above has the following problems. (1) Since the submarine shaft 14 is immovable, the offshore buoy 1
2 and platform 18 are limited in their movement range due to wind waves and ocean currents, and require mooring. In terms of the safety of the mooring equipment, there are restrictions on water depth and sea conditions during operation. (2) In the single-point mooring method, the riser pipe 15 is left at the site together with the buoy 12 during evacuation during stormy weather, so it is required that sea conditions during stormy weather do not become too severe. (3) In the method using the semi-submersible offshore platform 18, it is necessary to store and reinstall the riser pipe 15 before and after evacuation in case of stormy weather. The riser pipe 15 is usually a rigid pipe using a steel pipe, and it takes a lot of time and effort to sequentially store each pipe element while separating them from each other, or to install them while joining them. By the way, when we aim to introduce carbon dioxide gas into the deep sea, a depth and density of approximately 500 m or more is required in order to obtain the pressure at which carbon dioxide gas does not evaporate at water temperature and remains as a liquid, and it is also heavier than seawater and does not surface. Approximately 3000 for
It is thought that it is necessary to insert the material to a depth of more than m. Sea areas with such great depths are not found in bays or inland seas, but in open oceans, and are generally far from land.
Sea conditions are harsh. Therefore, a single-point mooring method, which requires mooring of a buoy as a basic requirement and is subject to restrictions due to sea conditions during rough weather, is therefore unsuitable. Furthermore, in the case of a method using a semi-submersible offshore platform, the water depth is large, so the time and effort required to store and reinstall the input pipe are enormous. Furthermore, the semi-submersible offshore platform itself is not suitable for transporting carbon dioxide gas from land, and requires a separate dedicated ship for transporting carbon dioxide gas, which increases the construction cost of the entire system. In other words, the conventional equipment used in such similar technology cannot be used for the targeted injection of carbon dioxide gas into the deep sea. The present invention was proposed in view of the above circumstances, and provides a carbon dioxide gas transport ship that can transport carbon dioxide gas from land and easily drop it into the ocean at great depths without being affected by sea conditions. The purpose is to

0004

[Means for Solving the Problems] Therefore, the present invention provides a tank for storing liquid carbon dioxide gas, and a tank connected to the tank, which has flexibility for sending the liquefied carbon dioxide gas to the deep sea, and has resistance to the external pressure of the deep sea. A flexible hose with pressure resistance,
It is characterized by being equipped with a reel for winding up the flexible hose.

[0005]

[Operation] According to such a configuration, there is no need to set up a special offshore base or a charging pipe system at the site where carbon dioxide gas is to be introduced, and the charging pipe can be quickly stored and reinstalled easily.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is an overall view of a carbon dioxide transport ship during transportation, where (a) is a side view and (b) is a plan view. In the figure, a transport ship 1 is equipped with a storage tank 2 that can achieve and maintain a temperature and pressure state that allows carbon dioxide to remain in a liquid phase.
It loads liquefied carbon dioxide gas at a land base and heads to the loading area. The flexible hose 3 is wound around a reel 4. Next, Figure 2 is a diagram showing the operational status after arrival at the input area, with (a) being a side view and (b) being a plan view. In the figure, the flexible hose 3 is lowered to a required depth as an input pipe, and sends the liquefied carbon dioxide in the storage tank 2 into the sea. If the transport ship 1 is equipped with an auxiliary propulsion device 6 for position control in addition to the main propulsion device 5, the bow can be erected in the direction of wind and waves, and the ship's vibration and drifting speed can be reduced. The utilization rate will be higher.

[0007]

[Effects of the Invention] As described above, according to the present invention, since the transport ship 1 is equipped with the injection pipe 3 for sending carbon dioxide gas into the deep sea, it is possible to set up a special offshore base or injection pipe system at the site. This eliminates the need for construction and maintenance costs for the entire facility. Further, by using a flexible hose as the input pipe 3 and hoisting it up and lowering it with a reel on board, the input pipe can be stored and installed quickly and easily, and efficient work can be realized. In short, according to the present invention, there is provided a tank for storing liquid carbon dioxide, a flexible hose connected to the tank, and having flexibility and pressure resistance to withstand the external pressure of the deep sea for sending the liquid carbon dioxide into the deep sea. By being equipped with a reel for winding up the flexible hose, a carbon dioxide transport ship is provided that can transport carbon dioxide from land and easily throw it into the deep sea without being affected by sea conditions. Therefore, the present invention is extremely useful industrially.

[Brief explanation of drawings]

FIG. 1 is a plan view and a side view showing the state of a carbon dioxide transport ship according to an embodiment of the present invention during transportation.

2 is a plan view and a side view showing the state of the carbon dioxide transport ship shown in FIG. 1 during operation; FIG.

FIG. 3 is a perspective view showing an offshore oil production system using a conventional single-point mooring method.

FIG. 4 is a plan view and a side view showing an offshore oil production system using a conventional semi-submersible offshore platform.

FIG. 5 is an enlarged side view of the tensioner device of the semi-submersible offshore platform shown in FIG. 4;

[0008]

[Explanation of symbols]

1. Carbon dioxide transport ship 2 Liquefied carbon dioxide storage tank 3 Flexible hose 4 Reel 5 Main thruster (side thruster) 6. Secondary propulsion device 10 Tanker 11 Mooring rope 12 Buoy 13 Anchor chain 14 Submarine tunnel 15 Riser pipe 16 Hose 17 Oil production equipment 18 Offshore platform 19 Derrick 20 Tanker 21 Cargo handling hose 22 Tensioner line 23 Weight

Claims (1)

[Claims] 1. A tank for storing liquid carbon dioxide; a flexible hose connected to the tank and having flexibility and pressure resistance to withstand the external pressure of the deep sea for sending the liquefied carbon dioxide to the deep sea; A carbon dioxide transport vessel characterized by being equipped with a reel for winding up a flexible hose.