JP4936206B2 - Carbon dioxide sequestration method and apparatus - Google Patents

Description

  The present invention relates to a carbon dioxide sequestration method and apparatus using a concrete structure.

In recent years, carbon dioxide has been considered as a causative agent of global warming, but as a carbon dioxide treatment technology, carbon dioxide recovered from a large amount of carbon dioxide generation sources such as power plants has been liquefied and has long been A method is generally known in which a long-sized pipe is poured into the deep sea at a depth of 3500 m or more to sink and stored on the deep sea floor.
However, with regard to such disposal of liquid carbon dioxide at the sea bottom, when liquid carbon dioxide settles, part of it dissolves in seawater and changes the pH of seawater, which may adversely affect the deep sea environment such as ecosystems. It is possible that there is. In addition, it is considered that liquid carbon dioxide accumulated in the deep sea bottom dissolves into the sea water and brings about changes in the deep sea environment over a long period of time. In order to solve such problems, the following inventions have been proposed.

  JP-A-8-230772 (Patent Document 1) aims to provide a seabed dumping system of liquid CO2 that prevents adverse effects on the deep sea environment and the deep sea seabed environment. An offshore base having an input pipe and an input port for receiving liquid carbon dioxide floated on the ocean and carried by a liquid CO2 carrier, and sealed in a bag in the sea at a depth where the liquid phase state of carbon dioxide is maintained; A plurality of capsules containing the above-mentioned bag for containing carbon dioxide are mounted, transported to the depth of the sea where the liquid phase state of carbon dioxide is maintained, and after filling liquid carbon dioxide into the bag at this depth , An unmanned submersible work ship that performs the work of dropping this liquid carbon dioxide with the bag to the sea floor, and a control base that controls the unmanned submersible work ship at sea Characterized by comprising the "carbon dioxide seabed dumping system" it has been proposed.

  Japanese Patent Laid-Open No. 5-193922 (Patent Document 2) discloses a clathrate production container whose inside is kept in a low temperature and high pressure state for the purpose of safely and reliably dumping carbon dioxide into the sea. Carbon dioxide and seawater are put into the two and a carbon dioxide / water clathrate film is formed on the interface between the two, and the membrane is vibrated to destroy the carbon dioxide / water clathrate film. A “carbon dioxide treatment method” characterized in that particles are allowed to settle in water has been proposed.

  Japanese Patent Laid-Open No. 5-76750 (Patent Document 3) discloses a suction side of a pump provided on a floating body floating on the sea for the purpose of safely and reliably dumping carbon dioxide into the sea. A liquid carbon dioxide supply pipe and a seawater intake pipe are connected to the pump, and a liquid carbon dioxide dump pipe extending toward the sea is connected to the discharge side of the pump, and a part of the portion of the liquid carbon dioxide dump pipe located in the sea Alternatively, a “carbon dioxide treatment apparatus” characterized in that the whole is branched into a plurality of branch pipes has been proposed.

  However, with regard to the method of dumping carbon dioxide into the sea as described above, the equipment, transportation, and treatment are not only extremely costly, but there is no negative impact on the environment over a long period of time. It has not yet been fully demonstrated.

  On the other hand, research and development of marine organisms such as plankton, utilization techniques such as trees, electrochemical techniques, and underground sequestration have become issues as recent carbon dioxide suppression measures. For the research and development of a technique for storing and fixing carbon dioxide, for example, the following inventions have been proposed.

  JP 2007-177585 A (Patent Document 4) provides a carbon dioxide-immobilized surface layer that can be easily formed in a desired region and can effectively immobilize carbon dioxide in the atmosphere. The purpose is to spray concrete on the slope or building surface with concrete composition containing water, cement, admixture, aggregate, and organic fiber made of alkali-decomposable resin or UV-decomposable resin. A carbon dioxide-immobilized surface layer is formed by providing a cavity hole due to the organic fibers that are three-dimensionally oriented in the composition, and carbon dioxide in the atmosphere is immobilized. "Surface layer and manufacturing method thereof" have been proposed.

JP-A-8-230772 JP-A-5-193922 Japanese Patent Laid-Open No. 5-76750 JP 2007-177585 A

  The present invention pays attention to the effective use of concrete structures such as existing abandoned tunnels and BOX culverts for carbon dioxide treatment technology, and it is simpler and more economical than conventional techniques to sequester carbon dioxide. An object is to provide a carbon sequestration method and apparatus.

In order to solve the above problems, the invention described in claim 1 is a carbon dioxide sequestration method using a concrete structure, and the concrete structure is intended to be used as an existing waste tunnel or underdrain. A BOX culvert that is commercially available, or a combination of an existing abandoned tunnel and the BOX culvert , forming a concrete wall at the opening of the concrete structure to close the concrete structure, and After installing the carbon supply pipe, carbon dioxide is pumped from the outside through the supply pipe and pressurized and stored inside the concrete structure, and various places can be used by effectively utilizing the waste roads in mountainous areas and land in depopulated areas. It can be constructed economically .

The invention according to claim 2 forms a concrete structure group by providing a plurality of closed concrete structures according to claim 1 and connecting the concrete structures with each other via the supply pipe. The carbon dioxide is stored under pressure inside the concrete structure group.

The invention described in claim 3 is a carbon dioxide separator using a concrete structure, wherein the concrete structure is an existing waste tunnel, and a concrete wall is formed at an opening of the existing waste tunnel. The carbon dioxide supply pipe is attached to the concrete wall, and the carbon dioxide is pressurized and stored inside the closed existing waste tunnel.

The invention according to claim 4 is a carbon dioxide sequestration device using a concrete structure, the concrete structure comprising a BOX culvert marketed with the intention of being used as a culvert , Concrete is placed on the inner bottom plate and the outer side surface of each connecting part of the BOX culvert to prevent leakage, a concrete wall is formed at the opening of the BOX culvert, and a carbon dioxide supply pipe is attached to the concrete wall. The carbon dioxide is pressurized and stored in the closed BOX culvert.

Furthermore, the invention described in claim 5 is a combination of the closed existing waste tunnel described in claim 3 and the blocked BOX culvert described in claim 4 connected through the supply pipe. It is characterized by.

  As described above, according to the carbon dioxide sequestration method and apparatus using the concrete structure according to the present invention, carbon dioxide can be sequestered more easily and economically than in the prior art. In addition, because it can be economically constructed in various places by effectively utilizing the abandoned routes in mountainous areas and land in depopulated areas, it can solve environmental problems caused by carbon dioxide and depopulate that requires new industrial policies. It can also be used to solve local economic problems that are difficult to achieve.

It is explanatory drawing which shows the state which obstruct | occluded the existing waste tunnel with the concrete wall. It is sectional drawing which shows the concrete wall formed in the opening part of the existing waste tunnel. It is explanatory drawing which shows the supply pipe | tube of the carbon dioxide attached to a concrete wall. It is explanatory drawing which shows the state which obstruct | occluded the BOX culvert with the concrete wall. It is explanatory drawing which shows the internal bottom plate of the connection part of a BOX culvert. It is explanatory drawing which shows the external side surface of the connection part of a BOX culvert. It is a conceptual diagram (1) which shows the construction example which combined the existing waste tunnel and the BOX culvert. It is a conceptual diagram (2) which shows the construction example which combined the existing waste tunnel and the BOX culvert.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In this embodiment, carbon dioxide is sequestered using an existing waste tunnel, a BOX culvert marketed with the intention of being used as a culvert, or a concrete structure comprising a combination of an existing waste tunnel and the BOX culvert. The apparatus will be described. Moreover, since the useful life of concrete is about 50 years, it can be used for a long time.

FIG. 1 is an explanatory view showing a state where an existing waste tunnel is closed with a concrete wall. As shown in FIG. 1, the concrete structure includes an existing waste tunnel 10, and concrete walls 20 are formed at openings 11 at both ends of the existing waste tunnel 10. As shown in FIG. 2, the concrete wall 20 has reinforcing bars arranged side by side in vertical and horizontal directions with insertion bar anchors 21 a and 21 b for securing pulling strength in the openings 11 a and 11 b of the existing waste tunnel 10 (for example, D16 @ 200) Reinforcing bar 22 is applied and formed by placing concrete (for example, 21-8-20BB) having an appropriate strength. In addition, the size of the concrete wall 20 varies depending on the weathering state of the opening 11, but the inner wall thickness (symbol L = 500 mm or more in FIG. 2) and the upper and lower widths are set as much as possible. To do. In order to prevent leakage, a water stop separator (not shown) is used.
As shown in FIG. 3, a carbon dioxide supply pipe 30 is attached to the supply port 23 of the concrete wall 20. The supply pipe 30 is a vinyl chloride pipe used for city gas supply, and is attached with a check valve 31 interposed. The supply pipe 30 is preferably provided with a leak detection sensor 32.

FIG. 4 is an explanatory view showing a state in which the BOX culvert is closed with a concrete wall. As shown in FIG. 4, the concrete structure is composed of a BOX culvert 40, and concrete walls 50 are formed at openings 41 at both ends of the BOX culvert 40. The concrete wall 50 has the same basic structure as the concrete wall 20 formed in the openings 11 at both ends of the existing waste tunnel 10 described above.
As shown in FIG. 5, reinforcing bars are arranged side by side in the inner bottom plate of each connection portion of the BOX culvert 40 (for example, D16 @ 200), and concrete having an appropriate strength (for example, 21-8-20BB). To form an internal connection concrete 51 for preventing leakage (length and width are about 500 mm). Further, as shown in FIG. 6, an external connection for preventing leakage by placing concrete (for example, 21-8-20BB) having an appropriate strength on the outer side surface of each connection portion of the BOX culvert 40. Concrete 52 is formed (width is about 500 mm).
A carbon dioxide supply pipe 30 is attached to a supply port (not shown) of the concrete wall 50 in the same manner as the concrete wall 20 of the existing waste tunnel 10 described above.

  Next, a construction example of a carbon dioxide separator using a concrete structure group composed of a combination of an existing waste tunnel and a BOX culvert will be described.

(Example of construction)
FIG. 7 is a conceptual diagram (1) showing a construction example in which an existing abandoned tunnel and a BOX culvert are combined.
(1) Prior inspection When using the existing abandoned tunnel 10, it is necessary to check in advance whether there are cracks or breakage in the concrete inside the tunnel. Therefore, the openings at both ends of the tunnel are temporarily closed and air is injected into the interior to inspect for leaks.
In addition, do not use the tunnel that has been found to leak, but construct the tunnels before and after that tunnel.
(2) Construction As shown in FIGS. 1 to 6, the existing waste tunnel 10 and the BOX culvert 40 are respectively closed by the concrete walls 20 and 50, and the BOX culvert 40 has an internally connected concrete 51 and an exterior for preventing leakage. The connecting concrete 52 is formed, and then the existing waste tunnel 10 closed and the closed BOX culvert 40 are connected via the supply pipe 30 to form a concrete structure group as shown in FIGS. 7 and 8.
The first supply pipe 30 is connected to a carbon dioxide pumping device B serving as a supply base, and receives supply from a carbon dioxide transport vehicle A that transports liquid carbon dioxide. Here, with respect to the carbon dioxide transport vehicle A and the carbon dioxide pumping device B, conventionally known carbon dioxide transport technology and pumping technology can be employed.
FIG. 8 is a conceptual diagram (2) showing a construction example in which an existing abandoned tunnel and a BOX culvert are combined.
According to the present invention, it can be economically constructed by effectively utilizing abandoned routes in mountainous areas and land in depopulated areas. Moreover, the installation location of the BOX culvert is not limited to the illustrated ground, but can be embedded in the ground, so that it can be economically constructed in various locations.

A Carbon dioxide transport vehicle B Carbon dioxide pressure feeder 10 Existing waste tunnel 11 Opening 20 Concrete wall 21 Reinforcement anchor 22 Reinforcement 23 Supply port 30 Supply pipe 31 Check valve 32 Leakage detection sensor 40 BOX culvert 41 Opening 50 Concrete wall 51 Internal connection concrete 52 External connection concrete

Claims (5)

A carbon dioxide sequestration method using a concrete structure , wherein the concrete structure is an existing waste tunnel, a BOX culvert that is marketed to be used as a culvert, or an existing waste tunnel and the BOX culvert A concrete wall is formed at the opening of the concrete structure to close the concrete structure, and a carbon dioxide supply pipe is attached to the concrete wall, and then carbon dioxide is supplied from the outside through the supply pipe. A carbon dioxide sequestration method characterized in that it can be pumped and stored in the concrete structure under pressure , and can be economically constructed in various places by effectively utilizing abandoned routes in mountainous areas and land in depopulated areas . After providing a plurality of closed concrete structures according to claim 1, a concrete structure group is formed by connecting the concrete structures with each other through the supply pipe, and carbon dioxide is formed inside the concrete structure group. A carbon dioxide sequestration method characterized by storing carbon under pressure. An apparatus for isolating carbon dioxide using a concrete structure, wherein the concrete structure comprises an existing waste tunnel, a concrete wall is formed in an opening of the existing waste tunnel, and a carbon dioxide supply pipe is provided on the concrete wall. A carbon dioxide sequestration device characterized in that carbon dioxide is pressurized and stored in an installed and closed existing waste tunnel. A carbon dioxide separator using a concrete structure, wherein the concrete structure comprises a BOX culvert that is marketed with the intention of being used as a culvert, and an inner bottom plate of each connecting portion of the BOX culvert Concrete is placed on the outer side to prevent leakage, a concrete wall is formed at the opening of the BOX culvert, a carbon dioxide supply pipe is attached to the concrete wall, and carbon dioxide is placed inside the closed BOX culvert. Carbon dioxide sequestration device characterized by storing pressure under pressure. And the existing waste tunnel which is closed according to claim 3, carbon dioxide sequestration system characterized in that a combination of occluded BOX Calvert connect each via the supply tube according to claim 4.