JPH04194495A - Carbon dioxide gas processing method - Google Patents

Abstract

PURPOSE:To fix carbon dioxide in the ocean by packing the carbon dioxide in a vessel of shape, into which liquid can be advanced, sinking the vessel in the ocean or lakes and marshes, and compressing the carbon dioxide by a pressure of water. CONSTITUTION:Carbon dioxide gas 2 of 1atm is packed to a vessel 3, provided with an opening part in the lower part and a valve 4 in the upper part, by a nozzle 1 provided under the sea level. The vessel 3 is fixed to a rotational type cable 5 and lowered to a 100m depth of water. As a depth of the vessel is increased, seawater is advanced into the vessel while compressing the carbon dioxide. The valve 4 is opened in the 100m depth of water to transfer the carbon dioxide fed to a small vessel 6, having an opening part in the lower part, and the small vessel 6 is lowered to about 500m depth by a separate rotational type cable 7. The carbon dioxide gas, whose pressure is 51atms in 500m, is liquefied. Here by opening an upper part valve 8 of the small vessel 6, the liquefied carbon dioxide is transferred to a storage vessel 9. The storage vessel 9, whose cover 10 is closed in the point of time the vessel 9 is filled with the liquefied carbon dioxide gas, is moved and fixed to a storage place. In this way, the carbon dioxide gas, liquefied, can be stored in the bottom of the ocean.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for treating carbon dioxide gas generated from power plants and the like in the ocean.

[Conventional technology]

The collection, removal, and disposal technology for carbon dioxide gas generated from large-scale sources such as power plants is described in "Measurement and Control" Vol. 29, No. 7, 655.
Pages 660 to 660 discuss how to dispose of it in the ocean. In this method, carbon dioxide gas discharged from thermal power plants and the like is separated and compressed to a pressure of 50 atmospheres or more to liquefy it. Liquefied carbon dioxide gas will be pumped 500m into the ocean. At this time, the carbon dioxide gas remains in a liquefied state due to water pressure, so it does not rise to the surface of the ocean and is trapped in the ocean.

[Problem to be solved by the invention]

According to the above-mentioned conventional technology, carbon dioxide gas can be trapped in the ocean, but the dissolution of carbon dioxide gas into the ocean has not been taken into account, and there is a possibility that large-scale destruction of the marine environment may occur. . One way to avoid this is to pack liquefied carbon dioxide into a container and let the container sink into the ocean, but this container must withstand an internal pressure of 50 atmospheres on land, and an external pressure of several hundred atmospheres in the deep sea. There was a problem in that the energy required for production was comparable to the amount of power generated by a thermal power plant, which is a source of carbon dioxide gas. In addition, conventional technology requires large-scale high-pressure equipment to compress large amounts of carbon dioxide gas on the ground, and the energy required to operate it is also comparable to the amount of power generated by thermal power generation, which is a source of carbon dioxide gas. Ta.

The object of the present invention is to provide a method for fixing carbon dioxide in the ocean.

[Means to solve the problem]

In order to achieve the above object, the present invention compresses and liquefies carbon dioxide gas by filling a container into which seawater can enter and letting it fall into the ocean. Also, liquefied carbon dioxide gas will be fixed in the ocean using similar containers.

[Effect]

If a container into which seawater can enter is filled with carbon dioxide gas and then lowered into the ocean, the seawater will compress the carbon dioxide gas and enter the container as the container becomes deeper.

At this time, the internal pressure of the container is equal to the water pressure at that depth, so the pressure difference between the inside and outside of the container is always O. The depth of the container is 500
When it reaches the front and back, the internal pressure of the container becomes 50 atmospheres due to water pressure.
Carbon dioxide gas liquefies. By fixing this container to the ocean floor, carbon dioxide gas can be stored in the ocean.

[Example] - Hereinafter, an example of the present invention will be described with reference to FIG. In this example, carbon dioxide gas is stored on the seabed at a depth of 500 meters. - Carbon dioxide gas 1 at atmospheric pressure is filled into a container 3 having an opening at the bottom by a nozzle 2 provided below the sea surface. A valve 4 is provided at the top of the container 3. The container 3 is fixed to a rotating cable 5 and lowered to a depth of 100 meters. As the depth of the container increases, seawater enters the container while compressing carbon dioxide gas. At this time, the pressure difference between the inside and outside of the container is always O. At a depth of 100 m, a valve 4 is opened and carbon dioxide gas is transferred to a small container 6 having an opening at the bottom. At this time, the pressure of carbon dioxide gas is 11 atm, so the small container 6
The volume of container 3 may be 1711. Container 3 is cable 5
Then, it will be brought back near the sea surface and used again. The small container 6 is fixed to another rotary cable 7 and lowered to a depth of approximately 500 m. Since seawater also enters the small container, the pressure difference between the inside and outside of the container is still O. At 500 m, the carbon dioxide pressure is 51 atm, so the carbon dioxide gas liquefies, but the specific gravity of liquefied carbon dioxide gas is less than 1. Here, the upper valve 8 of the small container 6 is opened and the liquefied carbon dioxide gas is transferred to the storage container 9. The small container 6 is pulled up to its original position by the rotary cable 7 and used repeatedly. When the storage container 9 is filled with liquefied carbon dioxide gas, the lid 10 is closed, and the storage container 9 is moved to a storage location 11 and fixed.

The pressure difference between the inside and outside of the storage container is also 0, same as the container 3 and the small container 6, and the storage container has better pressure resistance than a closed container.

According to this embodiment, carbon dioxide gas can be liquefied and stored on the ocean floor. In this example, carbon dioxide gas was transferred at a depth of 100 m, but this has the effect of saving 1,711 times the energy required for operation at a depth of 100 m or less. but,
Instead of transferring at 100 m, the container 3 may be lowered to 500 m and transferred to a storage container. Alternatively, the container 3 may be stored on the seabed without being pulled up.

A second embodiment of the present invention will be explained with reference to FIG.

This example shows an example in which a method of mechanically compressing carbon dioxide gas and a method of using a container into which seawater can enter is used in combination, and a method of dumping carbon dioxide gas into deep sea dust will be explained. Carbon dioxide gas 1 is mechanically compressed to 11 atmospheres and transferred to a small container 6 through a nozzle installed at a depth of 100 meters. The small container 6 is fixed to a rotary cable 7 and lowered to a depth of approximately 500 m. At 500 m, the carbon dioxide pressure is 51 atm, so the carbon dioxide gas liquefies, but the specific gravity of liquefied carbon dioxide gas is less than 1. Here, the upper valve 8 of the small container 6 is opened and the liquefied carbon dioxide gas is transferred to the storage container 9.

The small container 6 is pulled up to its original position by the rotary cable 7 and used repeatedly. When the storage container 9 is filled with liquefied carbon dioxide gas, the lid 1o is closed, and the storage container 9 is moved to a storage location 11 and fixed. According to this embodiment, carbon dioxide gas can be liquefied and stored on the ocean floor. At this time, the carbon dioxide gas can be mechanically compressed at a pressure of 11 atm, which consumes less energy than the conventional mechanical compression up to 50 atm, and can be performed using a small-sized device.

A modification of the embodiment of the present invention will be described below with reference to FIG. In this example, the container is not designed to allow seawater to enter.
Use a container that can change shape.

- Atmospheric carbon dioxide gas 1 is filled into a rubber container 11 through a nozzle 2 provided below the sea surface, and the container is sealed by tying the bottom of the container. A valve 12 is provided at the top of the rubber container 11. The rubber container 12 is fixed to a rotary cable 5 and lowered to a depth of 100 meters. As the depth of the rubber container increases, the rubber container is deformed by water pressure and its volume gradually decreases. At this time, the pressure difference between the inside and outside of the rubber container is only the deformation stress of the rubber.

At a depth of 100 meters, open the valve 12 and pour carbon dioxide into the small rubber container 13.
Transfer to. Since the pressure of the carbon dioxide gas at this time is 11 atm, the volume of the small rubber container 13 may be 1/11 of that of the rubber container 11. The rubber container 11 is pulled up to near the sea surface again by the cable 5 and used repeatedly. The small rubber container 13 is fixed to another rotary cable 7 and lowered to a depth of approximately 500 m.

At 100 m, the carbon dioxide pressure is 51 atm, so the carbon dioxide gas liquefies, but the specific gravity of liquefied carbon dioxide gas is smaller than l. Here, the valve 14 at the top of the small container 13 is opened, and the liquefied carbon dioxide gas is transferred to the rubber storage container 15.

The small container 13 is pulled up to its original position by the rotary cable 7 and used repeatedly. When the storage container 15 is filled with liquefied carbon dioxide gas, the lower part of the storage container 15 is tied up and sealed, and the storage container 15 is moved to the storage location 11 and fixed. According to this embodiment, carbon dioxide gas can be liquefied using a container that is deformed by water pressure and stored on the ocean floor.

〔Effect of the invention〕

According to the present invention, the pressure difference between the inside and outside of the carbon dioxide gas storage container on the ocean floor can be significantly reduced, so carbon dioxide gas generated from power plants, etc. can be stored in the container in the ocean, and
Since carbon dioxide gas is stored in the container, the marine environment can be preserved.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the invention, FIG. 2 is a system diagram of a second embodiment of the invention, and FIG. 3 is an explanatory diagram of a third system of the invention. 1... Nozzle, 2... Carbon dioxide gas, 3... Container, 4
,8゜12.14...Valve, 5,17...Rotary cable, 6...Small container, 9,15...Storage container, 10
...Lid, 11...Rubber container, 13...Small rubber container. CO 1st cause 2nd cause 3rd cause

Claims (1)

[Claims] 1. A method for compressing carbon dioxide gas, which is characterized by filling a container with a shape that allows liquid to enter with carbon dioxide gas, allowing the container to settle in the ocean or lake, and compressing the carbon dioxide gas using water pressure. Carbon dioxide compression method. 2. A method of confining carbon dioxide gas in the ocean or lakes, which is characterized by filling a container with a shape that allows liquid to enter with carbon dioxide gas and/or liquefied carbon dioxide gas, and placing this container in the ocean or lakes. Confinement method. 3. A method of compressing carbon dioxide gas, which is characterized by filling a container whose shape and/or volume can be changed by water pressure with carbon dioxide gas, allowing it to settle in the ocean or lake, and compressing the carbon dioxide gas with water pressure. Method. 4. The method of confining carbon dioxide gas in the ocean or lakes is characterized by filling a container whose shape and/or volume changes with water pressure with carbon dioxide gas and/or liquefied carbon dioxide gas, and placing this container in the ocean or lake. A method of trapping carbon dioxide gas.