KR20150146020A - Marine Vessels Using Gas Hydrate Slurries for Ballast Water - Google Patents

Abstract

The present invention relates to a marine vessel using a hydrate in a slurry state as ballast water. An objective of the present invention is to install a first and a second storage tank (4, 14) on a lower portion of a marine vessel to store a natural gas hydrate used as engine fuel and a CO2 hydrate produced by collecting CO2 in exhaust gas emitted from an engine (2) to use the natural gas hydrate and the CO2 hydrate in a slurry state stored in the first and the second storage tank (4, 14) as ballast water of the marine vessel to resolve a regulation problem for discharging the ballast water of the marine vessel and reduce greenhouse gas discharged from the marine vessel. To achieve the objective, the marine vessel using a hydrate in a slurry state as ballast water comprises: a first storage tank (4) in which a natural gas hydrate is stored; a dissociation unit (6) connected to the first storage tank (4) to dissociate the natural gas hydrate; a compressor (8) connected to the dissociation unit (6) to increase a pressure of dissociated natural gas to a pressure needed for an engine (2); the engine (2) connected to the compressor (8) and operated by supplied natural gas; a collection unit (10) connected to an exhaust port of the engine (2) to collect CO2 burned and emitted from the engine (2); a hydrate generator (12) connected to the collection unit (10) to produce a hydrate from CO2; and a second storage tank (14) connected to the hydrate generator (12).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a ship using slurry-form hydrate as a ballast,

The present invention relates to a slurry-type hydrate as a ballast, and more particularly, to a slurry containing natural gas hydrate slurry used as an engine fuel by providing first and second storage tanks under the vessel, CO2 hydrate slurry collected in the first and second storage tanks and using the slurry natural gas hydrate and CO2 hydrate as the equilibrium water of the ship to store the ship equilibrium water in the storage tank of the ship clean fuel Can be used to reduce or eliminate the fuel storage tank, thereby ensuring additional space.

In addition, CO2 in the exhaust gas discharged from the engine is captured and stored in the second storage tank in the form of slurry-like CO2 hydrate, whereby the emission of greenhouse gases of the ship can be drastically reduced.

In addition, since the ballast water is not discharged or discharged in a small amount by replacing all or part of the ballast water with hydrate slurry, it is possible to balance the slurry state hydrate, which can effectively solve the discharge water treatment problem due to the ballast water discharge regulation. The present invention relates to a watercraft-used vessel.

Generally, a ship which is sailing is tilted in the process of being affected by waves or turning, and at this time, the ballast water filled in the tank installed under the ship provides the restoring force, so that the tilted vessel is restored to its original position So that safe operation can be performed.

Such a ballast water should be filled in the tank within the prescribed range. However, since there is a case where a ballast water is injected in order to load more cargoes and cause a safety accident, a structural improvement measure for ballast water discharge regulation is required have.

In order to solve this problem, the first and second storage tanks are installed in the lower part of the ship to prepare a slurry of natural gas hydrate used as engine fuel and a CO2 hydrate slurry in which CO2 in the exhaust gas discharged from the engine is collected, It is possible to reduce or eliminate the fuel storage tank, thereby ensuring additional space.

In addition, when discharging the ballast water injected from offshore in offshore to other offshore ecosystem offshore, the ecosystem of the discharge ground can be disturbed. To prevent this, the International Maritime Organization (IMO) recently imposed regulations on the emission of ship ballast water and is demanding countermeasures.

In order to cope with this, the hydrate slurry may replace all or part of the ship ballast water. Therefore, since the ballast water is not discharged or discharged in a small amount, it is possible to effectively solve the problem of discharge water treatment according to the discharge regulation of the ballast water.

On the other hand, the conventional technology KR 10-1165134 B1 2012.7.5. Referring to FIG. 1, a CNG storage vessel 1 is installed in a CNG storage vessel. In the CNG storage vessel 1, a CNG discharge gas is mixed with ballast water to form a slurry (3) for transferring slurry gas hydrate, a ballast water storage tank (4) for storing and re-vaporizing the transferred gas hydrate in a slurry state, and a reboiler A water removing device 5 for removing moisture by supplying the gas that has been removed, a compressor 6 for supplying the moisture-removed gas to increase pressure, and an engine 7 are sequentially connected.

The CNG stored in the CNG storage vessel 1 is supplied to the engine 1 while moving in the order of the slurry gas hydrate generator 2, the feed pump 3, the ballast water storage tank 4, the water removal device 5, 7, and the CNG burned from the engine 7 is discharged as exhaust gas containing CO2 or the like.

The goal of this technology is to reduce the natural gas released to the atmosphere by storing the natural vapor of natural gas generated during the transportation of CNG into hydrate together with the ballast water and storing it temporarily as fuel. However, there is a disadvantage that it is difficult to expect a great effect in addition to preventing air release due to the natural vaporization of natural gas.

Particularly, as described above, the exhaust gas of the CNG burned in the engine 7 is released to the atmosphere, which causes a problem of environmental pollution and global warming. To solve this problem, the CO2 hydrate slurry produced by capturing CO2 in the exhaust gas can be used as ballast water.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the conventional art, and its object is as follows.

First, the first and second storage tanks are installed at the lower part of the vessel to store the slurry of natural gas hydrate used as the engine fuel and the CO2 hydrate slurry formed by collecting the CO2 of the exhaust gas discharged from the engine. By realizing a structure using natural gas hydrate and CO2 hydrate in the form of slurry stored in the tank as the ballast water of the ship, it is possible to reduce or eliminate the fuel storage tank by using the ballast water as the storage source of the ship fuel, So that additional space can be secured.

Second, it aims to dramatically reduce greenhouse gas emissions from vessels by capturing CO2 from the exhaust gas discharged from the engine and making CO2 hydrate and storing it in the second storage tank.

Third, replacing all or part of ballast water with hydrate slurry makes it possible to discharge ballast water or to discharge small amount of ballast water, and at the same time to effectively solve the problem of discharge water treatment according to the discharge regulation of ballast water.

A first storage tank (4) for storing a natural gas hydrate in a slurry state;

A dissociation unit 6 connected to the first storage tank 4 to dissociate the natural gas hydrate;

A compressor 8 connected to the dissociation unit 6 to increase the dissociated natural gas to a required pressure for the engine 2;

An engine (2) operated by natural gas supplied while being connected to the compressor (8);

A collecting unit 10 for collecting the CO2 that is burned and exhausted while being connected to the exhaust port of the engine 2;

A hydrate generator 12 connected to the collecting part 10 to convert CO2 into slurry CO2 hydrate;

And a second storage tank (14) connected to the hydrate generator (12).

In addition, the first and second storage tanks 4 and 14 are installed under the ship, so that the first and second storage tanks 4 and 14 are used as ballast water for horizontal maintenance of the ship.

The effects of the present invention are as follows.

First, the first and second storage tanks (4, 14) are installed in the lower part of the ship to store the slurry of natural gas hydrate used as the engine fuel and the CO2 hydrate slurry in which the CO2 of the exhaust gas discharged from the engine is captured. . Therefore, when the slurry natural gas hydrate and CO2 hydrate stored in the first and second storage tanks 4 and 14 are used as the equilibrium water of the ship, the ship equilibrium water is used as a storage source of the ship fuel to reduce the fuel storage tank It is advantageous in securing an additional space therefor.

Secondly, CO2 in the exhaust gas discharged from the engine 2 is collected and stored in the second storage tank 14 as CO 2 hydrate, thereby remarkably reducing the emission GHG of the ship.

Thirdly, replacing all or part of ballast water with hydrate slurry does not discharge ballast water or discharges a small amount of ballast water, so it is possible to effectively solve the problems of discharge water treatment according to discharge regulation of ballast water.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an installation state block diagram showing a prior art. Fig.
2 is a structural view of a ship to which an embodiment of the present invention is applied;

2, the ship is tilted by the centrifugal force in the process of swinging or turning by waves in the course of sailing. At this time, the ballast filled in the bottom of the ship provides the restoring force, .

As described above, the first storage tank 4, which serves as the ballast water and stores the slurry natural gas hydrate to be used as fuel for the engine 2 of the ship, is installed on the bottom side of the ship, and the first storage tank 4 are connected to a dissociation part 6 for dissociating the natural gas hydrate.

The dissociation unit 6 applies a general method of rapidly dissolving the natural gas hydrate by heating the water to a high-temperature form, but is not limited thereto.

Subsequently, the compressor 8 and the engine 2 are sequentially connected to the dissociation section 6, and the natural gas dissociated in the compressor 8 is boosted to the pressure necessary for the operation of the engine 2.

A collecting section 10 for collecting the CO2 contained in the combustion exhaust gas is connected to the exhaust port of the engine 2 and a hydrate generator for converting CO2 captured in a gaseous state into a hydrate in a slurry state 12 are connected.

The CO2 hydrate refers to a solid material in which CO2 and water are brought into contact with each other at high pressure and low temperature to capture CO2 in the lattice created by the water particles.

A method for producing such a hydrate is described in Patent Registration No. 10-0720270 "Method and apparatus for continuous production of natural gas hydrate ".

A second storage tank 14 for storing CO2 hydrate is connected to the hydrate generator 12 constructed as described above, and the second storage tank 14 is installed on the bottom side of the ship.

Hereinafter, the operation of the present invention will be described.

First, the vessel supplies the natural gas hydrate in the slurry state to the first storage tank 4 before storing it, and then moves the natural gas hydrate stored in the first storage tank 4 to the dissociation unit 6 And thereafter, the natural gas is pressurized and supplied so as to be suitable for use in the engine 2.

When the engine 2 is operated in the above-described state, the ship departs. At this time, when the supplied natural gas is burned in the engine 2 and discharged in the form of exhaust gas, the CO2 contained in the exhaust gas is collected 10, and the captured CO2 is transferred to the hydrate generator 12 to be made into slurry CO2 hydrate. After that, the hydrate is moved to the second storage tank 14 and stored do.

Therefore, most of the CO2 contained in the exhaust gas burned and discharged from the engine 2 of the ship is recovered, so that the greenhouse gas discharged when the ship sails is remarkably reduced.

The natural gas stored in the first storage tank 4 of the ship to be operated as described above is supplied to the engine 2 and burned. The CO2 contained in the burned exhaust gas is collected and made into slurry-like CO2 hydrate, When the ship is tilted by the centrifugal force in the course of swinging or turning by the waves in the process of storing in the tank 14, the natural gas hydrate in the slurry state stored in the first and second storage tanks 4 and 14 and the CO2 The hydrate functions as a ballast and improves the resilience of the ship.

Therefore, even if the ship is inclined, the ship can maintain its original posture due to the action of the CO2 hydrate in the slurry state and the natural gas hydrate, so that the ship can operate safely.

In addition, if the ballast water is used as a storage source of the ship fuel as described above, the fuel storage tank can be reduced or eliminated, which is advantageous in securing additional space.

Thereafter, when the ship arrives at the port, CO2 is recovered from the CO2 hydrate stored in the second storage tank 14.

On the other hand, if the ballast water injected from the offshore is discharged to a different place without being treated as described above, it becomes a main factor for generating ecosystem disturbance. Therefore, the ballast water used requires strict management for the marine ecosystem. As the hydrate slurry replaces all or part of the ship ballast water, the ballast water is not discharged, or only part of the ballast water is treated and discharged. Therefore, it can effectively cope with the ballast water discharge regulation.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to the disclosed embodiments. Those skilled in the art will appreciate that various modifications, It will be understood that various modifications and changes may be made without departing from the scope of the present invention.

2: engine 4: first storage tank
6: Disassembly 8: Compressor
10: Collecting part 12: Hydrate generator
14: Second storage tank

Claims (2)

A first storage tank (4) in which slurry natural gas hydrate is stored;
A dissociation unit 6 connected to the first storage tank 4 to dissociate the natural gas hydrate;
A compressor 8 connected to the dissociation unit 6 to increase the dissociated natural gas to a required pressure for the engine 2;
An engine (2) operated by natural gas supplied while being connected to the compressor (8);
A collecting unit 10 for collecting the CO2 that is burned and exhausted while being connected to the exhaust port of the engine 2;
A hydrate generator 12 connected to the collecting part 10 to convert CO2 into slurry CO2 hydrate;
And a second storage tank (14) connected to the hydrate generator (12). The method according to claim 1,
Wherein the first and second storage tanks (4, 14) are used as ballast water for horizontally maintaining the ship by installing the first and second storage tanks (4, 14) under the ship.

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