JPH05193922A - Treatment of carbon dioxide - Google Patents

Abstract

PURPOSE:To safely and surely discard carbon dioxide into the sea. CONSTITUTION:Carbon dioxide 4 and seawater 9 are introduced into a clathrate forming vessel 8 to form the film 11 of a carbon dioxide-water clathrate at the boundary surface between the carbon dioxide and seawater, the film 11 is vibrated and broken, and the grain of the carbon dioxide-water clathrate is submerged into the water.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a carbon dioxide treatment method.

[0002]

2. Description of the Related Art In recent years, carbon dioxide has been regarded as a problem as a causative agent of global warming. However, in a boiler or the like, a large amount of carbon dioxide is contained in the generated combustion exhaust gas. Measures to prevent the release are urgent.

Therefore, in recent years, a carbon dioxide separator for removing carbon dioxide from the combustion exhaust gas of the boiler and liquefying it has been developed. In this case, how to use a large amount of liquefied and separated carbon dioxide A new problem arises as to whether or not it should be processed.

For this reason, a treatment method has been proposed in which the carbon dioxide liquefied and separated by the carbon dioxide separator is dumped into the ocean.

[0005]

However, in the case of dumping liquefied carbon dioxide to the ocean, if the liquefied carbon dioxide is dumped to a place where the depth is shallow and the temperature and pressure are relatively high, the liquefied carbon dioxide will have the same temperature and pressure conditions. Since the specific gravity is lower than that of seawater, there is a problem that liquefied carbon dioxide rises to the sea surface, vaporizes, and is released to the atmosphere.

Further, if the liquefied carbon dioxide is dumped at a deep depth and at a low temperature and high pressure, for example, at a depth of more than 3000 meters, the liquefied carbon dioxide has a larger specific gravity than seawater under these temperature and pressure conditions. , The problem that liquefied carbon dioxide rises to the surface of the sea and is released to the atmosphere is solved, but it requires a long pipeline to dump liquefied carbon dioxide to a depth of more than 3000 meters, which is not practical. There was a problem of not having.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a carbon dioxide treatment method capable of safely and reliably dumping carbon dioxide into the sea.

[0008]

According to the present invention, carbon dioxide is put into a clathrate generating container installed in seawater to form a carbon dioxide / water clathrate film at the boundary surface between the container and the seawater. The present invention relates to a carbon dioxide treatment method, characterized in that a film of carbon dioxide / water clathrate is broken by applying vibration to the water and particles of carbon dioxide / water clathrate are settled in water.

[0009]

According to the present invention, a carbon dioxide / water clathrate film is generated at the interface between seawater and carbon dioxide by introducing carbon dioxide into the clathrate generating container, and when the film is vibrated, carbon dioxide The water clathrate membrane is destroyed and carbon dioxide / water clathrate particles settle in the water.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention.

A vibration generator such as a plunger pump 3 capable of intermittently supplying a fluid to a floating body 2 floating on the sea 1 is provided.

A carbon dioxide feed pipe 5 capable of feeding liquid carbon dioxide 4 carried by a ship (not shown) is connected to the suction side of the plunger pump 3, and the sea 1 is connected to the discharge side of the plunger pump 3. A carbon dioxide dump pipe 6 extending inward at a length of about several hundred to several thousand hundred meters is connected, and an orifice (not shown) is provided in the vicinity of the lower end of the carbon dioxide dump pipe 6 as necessary, and To the lower end of the carbon dump pipe 6, a clathrate generating container 8 having an open lower end is connected.

Reference numeral 9 is seawater, and 11 is a film of carbon dioxide / water clathrate 12 generated inside the clathrate producing container 8.

Next, the operation will be described.

For example, carbon dioxide 4 contained in combustion exhaust gas generated in a boiler or the like is liquefied and separated using a carbon dioxide separator, and the liquefied and separated carbon dioxide 4 is sent to the floating body 2 using a ship not shown. Carry.

Then, a carbon dioxide tank provided on the ship is connected to the carbon dioxide feed pipe 5, and then the plunger pump 3 is driven.

Then, due to the driving force of the plunger pump 3, the liquid carbon dioxide 4 in the carbon dioxide tank provided in the ship is sucked through the carbon dioxide feed pipe 5 and intermittently enters the carbon dioxide dump pipe 6. Is discharged.

After that, the carbon dioxide 4 intermittently flowing through the carbon dioxide discard pipe 6 is fed into the clathrate producing container 8 located at a depth of about several hundreds to several hundreds of meters.

The carbon dioxide 4 fed into the clathrate producing container 8 has a smaller specific gravity than seawater under the conditions of temperature and pressure at this depth, so it is separated from the seawater 9 inside the clathrate producing container 8, A boundary surface is formed between them.

The carbon dioxide 4 clathrates the water in the seawater 9 depending on the temperature and pressure conditions of the sea 1 at this depth, and the carbon dioxide / water clathrate 12 (1 molecule of carbon dioxide is surrounded by 7 molecules of water). In this state, a film 11 of carbon dioxide / water clathrate 12 is formed on the boundary surface.

The carbon dioxide / water clathrate 12 has a specific gravity heavier than that of the seawater 9, but the carbon dioxide / water clathrate 12 is in the form of a membrane 11 and is constrained to each other, so that it is difficult to settle. But,
Since the carbon dioxide 4 is intermittently fed to the inside of the clathrate generation container 8 by the plunger pump 3, the membrane 11 of the carbon dioxide / water clathrate 12 vibrates due to the intermittent feeding, and the membrane vibrates due to the vibration. 11 is destroyed and particles of carbon dioxide / water clathrate 12 settle to the sea floor.

At the destroyed portion of the membrane 11, contact between the carbon dioxide 4 and the seawater 9 is newly generated, so that a new carbon dioxide / water clathrate 12 is generated at that portion, and as a result, as described above. Then, carbon dioxide / water clathrate 12 sinks to the seabed one after another.

As described above, since the film 11 of carbon dioxide / water clathrate 12 is generated inside the clathrate generating container 8 and the film 11 is vibrated to cause the carbon dioxide / water clathrate 12 to settle. Therefore, it is possible to almost completely prevent the carbon dioxide 4 from being emitted to the outside of the clathrate generating container 8 and being diffused into the atmosphere without becoming the carbon dioxide / water clathrate 12.

Since the carbon dioxide 4 flowing through the inside of the carbon dioxide dump pipe 6 can be regarded as a continuous fluid, the plunger pump 3 has a driving force enough to overcome the pressure loss of the carbon dioxide dump pipe 6 and the like. Carbon dioxide 4 and seawater 9
Can be injected into the sea 1.

FIG. 3 shows a second embodiment of the present invention, in which an ordinary pump 13 is used in place of the plunger pump 3, and a plurality of carbon dioxide dump pipes 6 are connected to the discharge side of the pump 13. A solenoid valve 14 as a vibration generator is provided in the middle of the carbon dioxide dump pipe 6, and each solenoid valve 14
The vibration is generated in the film 11 by sequentially opening and closing, and the structure is the same as that of the above-described embodiment except that the same action and effect can be obtained.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and carbon dioxide may be in a gaseous form as well as a liquid form, and various other carbon dioxide may be used within the scope not departing from the gist of the present invention. Of course, changes can be made.

[0028]

As described above, according to the method for treating carbon dioxide of the present invention, the excellent effect that carbon dioxide can be safely and reliably dumped into the sea can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic overall view of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the clathrate generation container of FIG.

FIG. 3 is a schematic overall view of a second embodiment of the present invention.

[Explanation of symbols]

 3 Plunger pump (vibration generator) 4 Carbon dioxide 8 Clathrate generator 9 Seawater 12 Carbon dioxide / water clathrate 14 Solenoid valve (vibration generator)

Claims (1)

[Claims] 1. A carbon dioxide / water clathrate film is generated at a boundary surface between carbon dioxide and water in a clathrate generating container whose inside is kept at a low temperature and high pressure state, and the film is vibrated. A carbon dioxide treatment method characterized by destroying a carbon dioxide / water clathrate film and allowing particles of carbon dioxide / water clathrate to settle in water.