JP4883583B2 - CO2 deep sea injection method and apparatus - Google Patents

Description

  The present invention relates to a carbon dioxide deep-sea injection method and apparatus for liquefying carbon dioxide recovered from exhaust gas from a thermal power plant and sinking it to the seabed for processing.

  A method for treating carbon dioxide that liquefies carbon dioxide and stores it on the deep sea floor is attracting attention as an effective measure for preventing global warming (see, for example, Patent Document 1). In this method, it is necessary to send liquid carbon dioxide to the seabed at a depth of 3500 m or more which is stable in terms of density. Carbon dioxide liquefies at a pressure equivalent to a depth of 500 m, and its density increases with pressure. At a depth of 2700 m, it becomes the same density as seawater in a thermal equilibrium state, and at a deeper depth, the density becomes larger than seawater. Therefore, if carbon dioxide can be sent to a depth of 2700 m, the carbon dioxide will naturally settle down under its own weight.

As a method for sending carbon dioxide to a depth of 2700 m, a method is proposed in which a slurry in which liquid carbon dioxide and dry ice are mixed is discharged into a shallow sea having a depth of about 500 m and settled as a carbon dioxide slurry lump (for example, a patent) Reference 2). Since the density of liquid carbon dioxide is 1.2 g / cm ³ and the density of dry ice is 1.5 g / cm ³ , the density of the slurry lump is larger than that of the surrounding seawater and settles naturally due to its own weight. Since the temperature of the carbon dioxide slurry is as low as about −56 ° C., which is the coexistence temperature of liquid carbon dioxide and dry ice, it is covered with ice and heat transfer from the surrounding seawater is suppressed. For this reason, it is estimated that the temperature of the slurry lump is maintained at a low temperature until reaching a density stable depth of 2700 m.

JP-A-11-228122 JP 2004-113924 A

  By the way, in the method of discharging a slurry in which liquid carbon dioxide and dry ice are mixed as described above, when discharging the slurry into a shallow sea having a depth of about 500 m, a charging pipe extending to the same depth is used, and seawater is discharged from the tip of the pipe. Released inside. At this time, as described above, since the carbon dioxide slurry is very low temperature, there is a possibility that the tip of the charging pipe is cooled, the seawater comes into contact with the cooled tip and freezes, and the tip of the pipe is blocked. .

  The present invention has been made in view of the above problems, and provides a carbon dioxide deep-sea injection method and apparatus capable of stably discharging a carbon dioxide slurry, which is a mixture of liquid carbon dioxide and dry ice, into seawater. With the goal.

In the first carbon dioxide deep-sea injection method of the present invention, liquid carbon dioxide in a low temperature and high density state is sent to a predetermined depth in the sea through the carbon dioxide input pipe, and the liquid carbon dioxide is injected into the sea from the lower end of the input pipe. The released liquid carbon dioxide is allowed to settle while maintaining a thermal non-equilibrium state to a depth at which the liquid carbon dioxide is in a thermal equilibrium state and at the same density as seawater, and is then allowed to settle naturally to form carbon dioxide on the sea floor. A nozzle having an outer pipe surrounding the outer periphery of the liquid carbon dioxide inlet pipe and releasing high-temperature liquid carbon dioxide at 0 ° C. or higher from the nozzle outer pipe section. by either preventing the freezing of the liquid carbon dioxide introduced Kansaki end, or the inner tube constituting the lower end of the carbon dioxide slurry feeding pipe, and a double-tube type having an outer tube surrounding the inner tube outer periphery Provided with a nozzle, by releasing 0 ℃ or more high-temperature liquid carbon dioxide from said nozzle outer tube section, characterized by preventing the icing of the inner tube distal end.

  According to the present invention, since the liquid carbon dioxide at 0 ° C. or higher is released from the periphery of the inlet tube into which the low temperature liquid carbon dioxide is introduced, the vicinity of the tip of the tube cooled with the low temperature liquid carbon dioxide is Touching with seawater can be prevented. For this reason, it is possible to avoid a situation in which seawater freezes and closes the input pipe, and low-temperature liquid carbon dioxide can be released stably.

In the second carbon dioxide deep sea injection method of the present invention, a carbon dioxide slurry obtained by mixing liquid carbon dioxide and dry ice in a low temperature and high density state is sent to a predetermined depth in the sea through the carbon dioxide slurry injection pipe, The carbon dioxide slurry is discharged into the sea from the lower end of the input pipe, and the discharged carbon dioxide slurry is allowed to settle while maintaining a thermal non-equilibrium state to a depth at which the liquid carbon dioxide is in a thermal equilibrium state and equal in density to seawater. Then, it is a method of letting the carbon dioxide into the seabed by allowing it to settle naturally, provided at the lower end of the carbon dioxide slurry throwing pipe with a nozzle having an outer pipe that surrounds the outer circumference of the pipe, ℃ by releasing more hot liquid carbon dioxide, or to prevent freezing of the liquid carbon dioxide introduced Kansaki end, or, wherein the carbon dioxide slurry feeding pipe By providing a double tube type nozzle having an inner tube constituting the lower end and an outer tube surrounding the outer periphery of the inner tube, and releasing high-temperature liquid carbon dioxide of 0 ° C. or more from the nozzle outer tube portion, It is characterized by preventing the freezing of the tube tip .

  If a carbon dioxide slurry in which liquid carbon dioxide and dry ice are mixed is sent through a charging tube, the temperature of carbon dioxide is hardly increased due to the latent heat of dry ice. For example, since it can maintain about -50 degreeC for a long time, a slurry can be stably settled to the depth where density is stable.

A first carbon dioxide deep-sea injection device of the present invention includes a liquid carbon dioxide receiving storage container, a liquid carbon dioxide input pipe for sending liquid carbon dioxide from the storage container to a predetermined depth, and a lower end of the liquid carbon dioxide input pipe a nozzle provided, and carbon dioxide heating device for heating the liquid carbon dioxide in the container above 0 ° C., high temperature and sends the Atsushi Ko liquid carbon dioxide is warmed liquid carbon dioxide to a predetermined depth A liquid carbon dioxide input pipe, and the nozzle surrounds the outer periphery of the lower end of the liquid carbon dioxide input pipe, and has an outer pipe longer than the pipe, and is disposed between the liquid carbon dioxide input pipe and the outer pipe. The lower end of the high-temperature liquid carbon dioxide input pipe is connected , or the nozzle has an inner pipe constituting the lower end of the liquid carbon dioxide input pipe, and an outer pipe surrounding the outer circumference of the inner pipe Double tube type nozzle There, between the inner tube and the outer tube, the lower end of the hot liquid carbon dioxide injection tube is characterized in that it connects.

The second carbon dioxide deep-sea injection device of the present invention includes a liquid carbon dioxide receiving storage container, an apparatus for producing dry ice using the liquid carbon dioxide in the storage container, and the liquid carbon dioxide and dry ice in the container. A carbon dioxide slurry by mixing the carbon dioxide slurry, a carbon dioxide slurry introduction pipe for sending the carbon dioxide slurry from the apparatus to a predetermined depth, a nozzle provided at a lower end of the carbon dioxide slurry introduction pipe, and the inside of the container comprising of carbon dioxide warming device the liquid carbon dioxide is warmed to above 0 ° C., high temperature liquid carbon dioxide feeding pipe to send the Atsushi Ko liquid carbon dioxide is warmed liquid carbon dioxide to a predetermined depth, the The nozzle surrounds the outer periphery of the lower end of the carbon dioxide slurry injection pipe, and has an outer pipe longer than the pipe, between the carbon dioxide slurry injection pipe and the outer pipe. , Or lower end of the hot liquid carbon dioxide feeding pipe is connected, or the inner tube the nozzle, constituting the lower end of the liquid carbon dioxide feeding pipe, and a two with an outer tube surrounding the inner tube outer periphery It is a heavy tube type nozzle, and the lower end of the high temperature liquid carbon dioxide input tube is connected between the inner tube and the outer tube .

  As apparent from the above description, according to the present invention, since the high temperature liquid carbon dioxide is released near the tip of the carbon dioxide (including slurry) charging pipe, the vicinity of the cooled tip of the charging pipe is seawater. The situation where seawater freezes and the tube is blocked can be avoided. Therefore, liquid carbon dioxide can be stably released into the sea.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a piping diagram illustrating the configuration of a carbon dioxide deep-sea injection device according to the first embodiment of the present invention.
FIG. 2 is a side cross-sectional view showing the structure near the tip of the carbon dioxide slurry injection pipe of the carbon dioxide deep sea injection apparatus of FIG.
As shown in FIG. 1, the carbon dioxide deep-sea injection device 1 includes a liquid carbon dioxide receiving storage container 10, a carbon dioxide heating device (heat exchanger) 20 that heats liquid carbon dioxide to 0 ° C. or higher, and heating. High temperature liquid carbon dioxide input pipe 21 for sending the liquid carbon dioxide (high temperature liquid carbon dioxide) to a predetermined depth, a device 40 for producing dry ice using liquid carbon dioxide in the storage container 10, and liquid carbon dioxide The apparatus 50 mainly includes a device 50 that mixes dry ice to form a carbon dioxide slurry, and a carbon dioxide slurry introduction pipe 51 that sends the carbon dioxide slurry from the device to a predetermined depth. These devices are mounted on offshore structures or ships installed on the sea. From this offshore structure, a 500 m long high-temperature liquid carbon dioxide input pipe 21 and a carbon dioxide slurry input pipe 51 are suspended in water. A nozzle 60 is provided at the tip of the carbon dioxide slurry charging pipe 51.

  Carbon dioxide separated and recovered from the exhaust gas in a large-scale carbon dioxide generation source such as a thermal power plant is transported to the storage container 10 by the dedicated transport ship 2, at a temperature of −56 ° C. and 0.5 MPa. Stored under pressure conditions.

  A liquid carbon dioxide pump 12 is provided in the middle of the pipe 11 extending from the storage container 10. The pipe 11 branches in three directions at the tip of the pump 12, and each branch pipe 13, 14, 15 extends to the heat exchanger 20, the dry ice production device 40, and the dry ice mixing device 50. Yes.

  The first branch pipe 13 extends to the heat exchanger 20 via the condenser 16 via the valve 16 on the way. The heat exchanger 20 has a refrigerant circulation pipe 26, and a refrigerant container 27, a refrigerant pump 28, and an evaporator 29 are sequentially provided in the pipe 26. In this heat exchanger 20, the refrigerant pump 28 is operated to send the refrigerant in the refrigerant container 27 to the evaporator 29, the solvent is evaporated using seawater as a heat source, and the generated solvent gas is sent to the heat exchanger 20, The liquid carbon dioxide sent to the heat exchanger 20 is heated. The solvent cooled by the heat exchanger 20 is circulated by the refrigerant pump 28.

A high temperature carbon dioxide input pipe 21 is connected to the heat exchanger 20. The high temperature carbon dioxide input pipe 21 has a length of about 500 m and is suspended in seawater. A plurality of (for example, four) charging pipes 21 can be provided, and are disposed around the carbon dioxide slurry charging pipe 51 in parallel with the pipe 51 (only one is shown in FIG. 1). . Note that the high temperature carbon dioxide input pipe 21 and the carbon dioxide slurry input pipe 51 may be a double pipe. A valve 22 is provided in the middle of each input pipe 21. Another pipe 23 extends from the heat exchanger 20 to the dry ice mixing device 50. A valve 24 is provided in the middle of the pipe 23.
The condenser 30 is connected to a dry ice manufacturing apparatus 40 described later by a pipe 42. In addition, the condenser 30 is provided with a circulation pipe 31 connected to the upstream branch pipe 13. A valve 32 is provided in the middle of the pipe 31.

  The second branch pipe 14 extends to the dry ice production apparatus 40 via the valve 17 on the way. The dry ice produced by the device 40 is sent to the dry ice mixing device 50 by a conveying device 41 such as a screw conveyor. The carbon dioxide gas generated in the apparatus 40 is sent to the compressor 43 through the pipe 42 and then sent to the condenser 30 described above.

  The third branch pipe 15 is connected to the dry ice mixing device 50 via two valves 18 and 19 on the way. In the apparatus 50, dry ice and liquid carbon dioxide are mixed.

  From the dry ice mixing device 50, a slurry charging pipe 51 extends in the seawater in parallel with the above-described high-temperature liquid carbon dioxide charging pipe 21. The slurry injection pipe 51 has a length of about 500 m, and the outer surface is covered with a heat insulating layer 51a (see FIG. 2). As shown in FIG. 2, the tip of the slurry injection pipe 51 is exposed, and a nozzle 60 is attached to the tip. The nozzle 60 is of a double tube type and includes a large-diameter outer tube 61 that surrounds the tip of a slurry charging tube 51 (also referred to as an inner tube). The outer tube 61 is formed longer than the inner tube 51. An annular space S between the inner pipe 51 and the outer pipe 61 communicates with the high temperature liquid carbon dioxide input pipe 21.

An operation method of the liquid carbon dioxide deep sea injection device 1 will be described.
Prior to the start of operation, all valves 16, 17, 18, 19, 22, 24, 32 are closed. First, the valve 16 is opened, and the liquid carbon dioxide pump 12 is operated to draw liquid carbon dioxide from the storage container 10. Subsequently, in the refrigerant circulation pipe 26, the refrigerant pump 28 is operated to send the refrigerant in the refrigerant container 27 to the evaporator 29, and the refrigerant is evaporated using seawater as a heat source. The generated solvent gas is sent to the heat exchanger 20 to heat the liquid carbon dioxide sent to the heat exchanger 20. The solvent cooled by the heat exchanger 20 is circulated in the pipe 26 by the refrigerant pump 28 and reused.

  When the temperature of the liquid carbon dioxide becomes 0 ° C. or higher, first, the valve 24 is opened, and this high-temperature liquid carbon dioxide is injected into the carbon dioxide slurry introducing pipe 51 through the pipe 23 through the dry ice mixing device 50. Thereby, the seawater in the charging pipe 51 is extruded, and a liquid column of high-temperature liquid carbon dioxide is formed in the pipe. This is to prevent freezing of seawater in the pipe by injecting liquid carbon dioxide at −56 ° C. directly into the pipe.

  Next, the valve 24 is closed and the valve 22 is opened, high temperature liquid carbon dioxide is injected into the high temperature liquid carbon dioxide input pipe 21, and the inside of the input pipe 21 and the nozzle 60 is filled with high temperature liquid carbon dioxide.

  Thereafter, the valve 17 is opened, and a part of the liquid carbon dioxide is introduced into the dry ice production apparatus 40 from the branch pipe 14 to produce dry ice. The produced dry ice is transported to the dry ice mixing device 50 by the transport means 41, and is charged into the carbon dioxide slurry charging pipe 51 from the device 50. High-temperature liquid carbon dioxide has already been introduced into the charging pipe 51, and dry ice and liquid carbon dioxide are mixed to produce a carbon dioxide slurry. In addition, this causes the temperature in the pipe 51 to begin to decrease.

  Note that the carbon dioxide gas generated in the dry ice production apparatus 40 is pressurized by the compressor 43 through the pipe 42 and then introduced into the condenser 30 to be liquefied. After liquefaction, the valve 32 is opened to join the branch pipe 13.

  When the temperature in the carbon dioxide slurry charging pipe 51 is lowered to −56 ° C. due to the introduction of dry ice, the valves 18 and 19 are opened, and the liquid carbon dioxide in the storage container 10 is supplied to the dry ice mixing device 50 through the pipes 11 and 15. Send to. At the same time, dry ice is sent from the dry ice production apparatus 40 to the dry ice mixing apparatus 50 and mixed with liquid carbon dioxide in the apparatus 50 to form a carbon dioxide slurry. The carbon dioxide slurry is discharged from the nozzle 60 into the sea through the charging pipe 51.

  At this time, as shown in FIG. 2, the liquid carbon dioxide at 0 ° C. or higher passes through the space S between the outer pipe 61 of the nozzle 60 and the tip of the carbon dioxide slurry inlet pipe 51 from the high temperature liquid carbon dioxide inlet pipe 21. Has been released. Since the outer tube 61 is formed longer than the inner tube 51, the released liquid carbon dioxide descends along the inner side of the outer tube 61 and then rises around the outer tube 61. With such a configuration, the tip of the charging pipe 51 that is cooled by the internal carbon dioxide slurry hardly touches seawater because liquid carbon dioxide of 0 ° C. or higher exists in the vicinity or near the lower end. Therefore, even if the low temperature slurry is discharged, freezing does not occur at the tip of the charging pipe 51, and the charging pipe 51 can be prevented from being blocked.

  When stopping the operation, first, the operation of the dry ice production apparatus 40 is stopped, and the supply of dry ice and liquid carbon dioxide is stopped. Then, the valve 24 is opened little by little, and high temperature liquid carbon dioxide is gradually injected into the carbon dioxide slurry introduction pipe 51 to bring the temperature in the pipe to 0 ° C. or higher, and then all valves are closed to operate other equipment. To stop.

FIG. 3 is a piping diagram illustrating the configuration of the carbon dioxide deep sea injection apparatus according to the second embodiment of the present invention.
The carbon dioxide deep-sea injection device 1 shown in FIG. 1 sends a carbon dioxide slurry generated by mixing liquid carbon dioxide and dry ice into the deep sea. In this example, the device 1 sends liquid carbon dioxide directly into the deep sea. ′ Will be described. 3, parts / members having the same functions and configurations as those in FIG. 1 are denoted by the same reference numerals as those in FIG.

  That is, the dry ice production apparatus 40 for generating the carbon dioxide slurry in the apparatus of FIG. 1 and the piping associated with the apparatus 40 (the piping 14, the valve 17, the piping 42, the compressor 43, the condenser 30, the piping 31, The valve 32) becomes unnecessary. Moreover, the dry ice mixing apparatus 50 which mixes dry ice and liquid carbon dioxide becomes unnecessary.

  One of the pipes 15 (third branch pipe) branched from the pipe 11 extending from the storage container 10 is connected to the liquid carbon dioxide input pipe 71. The liquid carbon dioxide input pipe 71 extends into the seawater and is connected to the nozzle 60. Further, a pipe 23 branched from the heat exchanger 20 is connected to the liquid carbon dioxide input pipe 71.

The operation method of this liquid carbon dioxide deep sea injection device 1 'will be described.
Prior to the start of operation, all valves 16, 18, 19, 22, 24 are closed. First, the valve 16 is opened, and the liquid carbon dioxide pump 12 is operated to draw liquid carbon dioxide from the storage container 10. Subsequently, in the refrigerant circulation pipe 26, the refrigerant pump 28 is operated to send the refrigerant in the refrigerant container 27 to the evaporator 29, and the refrigerant is evaporated using seawater as a heat source. The generated solvent gas is sent to the heat exchanger 20 to heat the liquid carbon dioxide sent to the heat exchanger 20. The solvent cooled by the heat exchanger 20 is circulated in the pipe 26 by the refrigerant pump 28 and reused.

  When the temperature of the liquid carbon dioxide becomes 0 ° C. or higher, first, the valve 24 is opened, and this high-temperature liquid carbon dioxide is injected into the liquid carbon dioxide input pipe 71 through the pipe 23. Thereby, the seawater in the injection pipe 71 is extruded, and a liquid column of high-temperature liquid carbon dioxide is formed in the pipe. This is to prevent freezing of seawater in the pipe by injecting liquid carbon dioxide at −56 ° C. directly into the pipe.

  Next, the valve 24 is closed and the valve 22 is opened, high temperature liquid carbon dioxide is injected into the high temperature liquid carbon dioxide input pipe 21, and the inside of the input pipe 21 and the nozzle 60 is filled with high temperature liquid carbon dioxide.

  Thereafter, the valves 18 and 19 are opened, and the liquid carbon dioxide in the storage container 10 is sent to the liquid carbon dioxide input pipe 71 through the pipes 11 and 15. The liquid carbon dioxide is discharged from the nozzle 60 into the sea through the input pipe 71. At this time, similarly to the above-described example, the tip of the charging pipe 71 cooled by the liquid carbon dioxide inside is hardly in contact with seawater because liquid carbon dioxide of 0 ° C. or more exists in the vicinity or near the lower end. Therefore, even when low temperature liquid carbon dioxide is released, freezing does not occur at the tip of the charging pipe 71, and the charging pipe 71 can be prevented from being blocked.

It is a piping diagram explaining the structure of the carbon dioxide deep sea injection apparatus which concerns on the 1st Embodiment of this invention. It is side surface sectional drawing which shows the structure of the tip vicinity of the carbon dioxide slurry injection | throwing-in pipe | tube of the carbon dioxide deep sea injection | throwing-in apparatus of FIG. It is a piping diagram explaining the structure of the carbon dioxide deep sea injection apparatus which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

1, 1 'carbon dioxide deep sea injection device 2 transport ship 10 storage vessel 11, 13, 14, 15, 23, 31, 42 piping 16, 17, 18, 19, 22, 24, 32 valve 12 liquid carbon dioxide pump 21 high temperature Liquid carbon dioxide input pipe 26 Refrigerant circulation pipe 27 Refrigerant container 28 Refrigerant pump 29 Evaporator 30 Condenser 40 Dry ice production apparatus 43 Compressor 50 Dry ice mixing apparatus 51 Carbon dioxide slurry input pipe 60 Nozzle 61 Outer pipe 71 Liquid carbon dioxide input tube

Claims (4)

Liquid carbon dioxide in a low-temperature and high-density state is sent to a predetermined depth in the sea through the carbon dioxide input pipe,
The liquid carbon dioxide is released into the sea from the lower end of the input pipe,
The released liquid carbon dioxide is allowed to settle while maintaining a thermal non-equilibrium state to a depth at which the liquid carbon dioxide is in a thermal equilibrium state and equal in density to seawater,
After that, it is a method of letting the carbon sink into the seabed by natural sedimentation,
A nozzle having an outer tube surrounding the outer periphery of the tube is provided at the lower end of the liquid carbon dioxide inlet tube, and high temperature liquid carbon dioxide at 0 ° C. or higher is discharged from the nozzle outer tube portion, whereby the liquid carbon dioxide inlet tube or to prevent freezing of the previous end, or,
A double tube type nozzle having an inner tube constituting the lower end of the liquid carbon dioxide input tube and an outer tube surrounding the outer periphery of the inner tube is provided, and high temperature liquid carbon dioxide of 0 ° C. or more is supplied from the nozzle outer tube portion A carbon dioxide deep-sea injection method characterized by preventing freezing at the tip of the inner tube by discharging . A carbon dioxide slurry mixed with liquid carbon dioxide and dry ice in a low temperature and high density state is sent to a predetermined depth in the sea through the carbon dioxide slurry injection pipe,
The carbon dioxide slurry is discharged into the sea from the lower end of the charging pipe,
The released carbon dioxide slurry is allowed to settle while maintaining a thermal non-equilibrium state to a depth where the liquid carbon dioxide is in a thermal equilibrium state and equal in density to seawater,
After that, it is a method of letting the carbon sink into the seabed by natural sedimentation,
A nozzle having an outer tube surrounding the outer periphery of the tube is provided at the lower end of the carbon dioxide slurry charging tube, and high temperature liquid carbon dioxide at 0 ° C. or higher is discharged from the nozzle outer tube portion, whereby the liquid carbon dioxide charging tube or to prevent freezing of the previous end, or,
A double pipe type nozzle having an inner pipe constituting the lower end of the carbon dioxide slurry charging pipe and an outer pipe surrounding the outer circumference of the inner pipe is provided, and high temperature liquid carbon dioxide of 0 ° C. or higher is supplied from the nozzle outer pipe portion Carbon dioxide deep-sea injection method characterized by preventing freezing at the tip of the inner tube by discharging A liquid carbon dioxide storage container;
A liquid carbon dioxide input pipe for sending liquid carbon dioxide from the storage container to a predetermined depth;
A nozzle provided at the lower end of the liquid carbon dioxide input pipe;
A carbon dioxide heating device for heating liquid carbon dioxide in the storage container to 0 ° C. or higher;
And a high-temperature liquid carbon dioxide feeding pipe to send the Atsushi Ko liquid carbon dioxide is warmed liquid carbon dioxide to a predetermined depth,
The nozzle, surrounds the lower end outer periphery of the liquid carbon dioxide feeding pipe has a longer outer tube than the tube, between said outer tube and said liquid carbon dioxide feeding pipe the hot liquid carbon dioxide feeding pipe Is connected to the lower end of the
The nozzle is a double tube type nozzle having an inner tube constituting a lower end of the liquid carbon dioxide input tube, and an outer tube surrounding the outer periphery of the inner tube, and between the inner tube and the outer tube, A carbon dioxide deep-sea injection device characterized in that the lower end of a high-temperature liquid carbon dioxide injection pipe is connected . A liquid carbon dioxide storage container;
An apparatus for producing dry ice using liquid carbon dioxide in the storage container;
An apparatus for mixing liquid carbon dioxide and dry ice in the storage container into a carbon dioxide slurry;
A carbon dioxide slurry feeding pipe for sending the carbon dioxide slurry from the apparatus to a predetermined depth;
A nozzle provided at a lower end of the carbon dioxide slurry charging pipe;
A carbon dioxide heating device for heating liquid carbon dioxide in the storage container to 0 ° C. or higher;
And a high-temperature liquid carbon dioxide feeding pipe to send the Atsushi Ko liquid carbon dioxide is warmed liquid carbon dioxide to a predetermined depth,
The nozzle, surrounds the lower end outer periphery of the carbon slurry feeding pipe has a longer outer tube than the tube, between the outer tube and the carbon dioxide slurry feeding pipe, the hot liquid carbon dioxide feeding pipe Is connected to the lower end of the
The nozzle is a double tube type nozzle having an inner tube constituting a lower end of the carbon dioxide slurry charging tube, and an outer tube surrounding the outer periphery of the inner tube, and between the inner tube and the outer tube, A carbon dioxide deep-sea injection device characterized in that the lower end of a high-temperature liquid carbon dioxide injection pipe is connected .

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