JP3583625B2 - Method for releasing carbon dioxide to the ocean and apparatus for releasing carbon dioxide to the ocean - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for dissolving recovered carbon dioxide in seawater and discharging carbon dioxide to the sea for sequestration.
[0002]
[Prior art]
In recent years, global warming has become a major problem, and it has been pointed out that the concentration of carbon dioxide (CO ₂ ) in the atmosphere with a greenhouse effect, which has been pointed out as a possibility of causing climate change on a global scale, is increasing. It is particularly important to control the rise. As one of the measures, a concept has been proposed in which carbon dioxide in combustion exhaust gas discharged from thermal power plants and the like is collected and sent to the ocean, thereby isolating carbon dioxide from the atmosphere for a long time. In order to achieve this, it is necessary to ensure that no new environmental impacts are caused in the ocean that sends carbon dioxide.
[0003]
The following two types of systems have been proposed as systems for reducing the influence on the marine environment due to the feeding of carbon dioxide. One of them is a storage type, which is a method in which the area of influence is limited to a specific place and localized by storing carbon dioxide intensively in a place such as a hollow on the deep sea floor.
[0004]
Another system, called the dissolution-diffusion type, is a method in which carbon dioxide is dissolved in seawater, diluted dilutely and diffused widely to suppress the rise in the concentration of carbon dioxide in seawater. However, it is based on the idea that the concentration of carbon dioxide originally dissolved in seawater only increases to some extent.
[0005]
As a specific method in the dissolution-diffusion type, there is a middle-layer dilution discharge method in which a discharge point of carbon dioxide is moved by a ship to discharge carbon dioxide in a middle layer in the sea. This method will be described with reference to FIGS. FIG. 1A is a diagram schematically showing a middle-layer dilution discharge system, FIG. 1B is an enlarged view of a portion Z in FIG. 1A, and FIG. 2 is a diagram showing a system for discharging by a discharge device. FIG. 3 is an explanatory view showing the behavior of droplets formed immediately after carbon dioxide is discharged from a discharge pipe.
[0006]
As shown in FIGS. 1 and 2, this middle-layer dilution discharge system liquefies carbon dioxide separated and recovered from flue gas in a land plant 1, fills the liquid carbon dioxide into a storage tank 2a, and performs predetermined , The liquid carbon dioxide in the storage tank 2a is transferred to the storage tank 3a mounted on the work boat 3. The liquid carbon dioxide has, for example, a pressure of 6 atm and a temperature of -55 ° C. FIG. 6 is a diagram showing the phase state of carbon dioxide. As can be seen from this diagram, the condition of 6 atm and a temperature of -55 ° C. are conditions under which liquid carbon dioxide can be obtained economically. The work boat 3 is provided with a discharge pipe 4 made of a steel pipe or the like suspended under the sea, and a plurality of liquid carbon dioxides are sent from the storage tank 3a to the discharge pipe 4 and formed at the lower end of the discharge pipe 4, for example, in the vertical direction. The water is discharged from the individual discharge holes 5 into the sea. The work boat 3 advances while discharging the liquid carbon dioxide from the discharge hole 5 of the discharge pipe 4 into the sea, thereby moving the discharge point of the liquid carbon dioxide without being limited to a local area and increasing the dilution of the liquid carbon dioxide. I have. The discharge pipe 4 is supported at the upper end thereof near the deck of the work boat 3 by a pivot so as to be able to tilt in the front-rear direction of the work boat. Will be inclined. Note that the carrier 2 and the work boat 3 may be different from each other, or may be shared by both. In the figure, SL indicates the sea surface.
[0007]
The behavior of the droplet of the liquid carbon dioxide discharged from the discharge pipe 4 is assumed as follows from the current knowledge. Not incorporated insoluble in released carbon dioxide 6 seawater immediately into the sea from the holes 5 of the discharge tube 4 as shown in FIG. 3, fluctuation flow field due to the eddy 8 discharge pipe 4 is gradually leaving generated downstream In 9, a large number of droplets 7 are dispersed and almost uniformly mixed with seawater. The discharge pipe 4 is inclined rearward in the direction of travel of the ship by the opposing relative flow velocities, and proceeds while continuously generating a wake vortex having a rotation axis substantially parallel to the pipe axis behind the discharge pipe. The pattern of the vortex 8 varies depending on conditions such as the shape, surface condition, dimensions and moving speed of the discharge pipe. It is considered that the swirl 8 is generated from the left and right sides of the pipe and the fluctuating flow field 9 is left behind, in which the liquid carbon dioxide and the seawater mix.
[0008]
Then, the liquid carbon dioxide droplet 7 gradually rises in the seawater from the wake of the discharge pipe 4 while being further dissolved in the surrounding seawater. That is, the diameter of the droplet 7 of the carbon dioxide 6 is reduced by being dissolved in the seawater while rising in the seawater. Then, in the process of ascending the droplet 7 to a certain height, all the liquid carbon dioxide is dissolved in the seawater, and the droplet 7 disappears.
[0009]
The middle-layer dilution discharge system discharges carbon dioxide in the middle layer sea. In other words, if carbon dioxide is released in the sea near the surface layer, droplets may reach the surface of the sea before all of the released liquid carbon dioxide dissolves in the seawater. The release of carbon allows all of the liquid carbon dioxide to dissolve into the seawater before the droplets reach the sea surface.
[0010]
[Problems to be solved by the invention]
Thus, the middle dilution discharge method is considered to be a very promising method for discharging and isolating liquid carbon dioxide into the ocean, but has the following problems.
[0011]
If liquid carbon dioxide released into the sea dissolves into seawater, it may cause an effect on marine organisms, such as a decrease in the pH (acidity) value of seawater. To minimize such effects, It is important to develop a technique for diluting carbon dioxide discharged into the sea as much as possible to suppress an increase in the concentration of carbon dioxide in seawater, that is, a decrease in PH.
[0012]
As described above, the liquid carbon dioxide discharged into the seawater from the discharge hole of the discharge pipe that moves forward moves into the seawater as droplets while rising at the width of the wake of the discharge pipe, and finally dissolves in the seawater. Droplets disappear and all dissolve into seawater. For this reason, the liquid carbon dioxide discharged into the seawater dissolves in the volume of seawater surrounded by the moving speed of the ship (moving speed of the discharge pipe), the width of the wake of the discharge pipe, and the height of the droplets. Will be diluted. That is, the initial dilution rate of the liquid carbon dioxide discharged into the seawater is obtained by an approximate expression of Q / b · U · L. Here, Q is the flow rate of the liquid carbon dioxide, b is the width of the wake (fluctuation flow field) of the discharge pipe, U is the speed of the work boat (the speed of the discharge pipe), and L is the vertical spread due to the floating of droplets. . For example, if Q is 100 kg / sec, b is 3 m (several times the outer diameter of the discharge pipe), and U is 3 m / sec (there is a restriction from the rise of the discharge pipe), L is about 300 m. The dilution ratio is 1/30000 and the pH is 6.5, and when L is approximately 1000 m, the dilution ratio is 1/90000 and the pH is 7.5.
[0013]
On the other hand, the droplets generated by discharging the liquid carbon dioxide into the seawater are slightly lighter than the surrounding seawater, and gradually dissolve into the surrounding seawater while rising. These droplets dissolve and shrink at a substantially constant speed, and the larger the initial diameter, the longer the rising distance before dissolving in seawater. If the initial droplet diameter immediately after discharging the liquid carbon dioxide from the discharge hole of the discharge pipe is too large, the liquid carbon dioxide will reach the surface of the sea before the droplets dissolve in the middle layer sea, and the liquid carbon dioxide will be removed from the atmosphere. The purpose of sequestration becomes inadequate, and many will adversely affect the activity of surface marine life. On the other hand, if the initial droplet diameter is too small, the rising height is short and dissolves in seawater within a short period of time, and as a result, a water mass having a high concentration of carbon dioxide is generated.
[0014]
Therefore, liquid carbon dioxide droplets released in the middle layer of the sea can be dissolved in seawater within the range of the depth of the middle layer, and liquid carbon dioxide can be dissolved in seawater without adversely affecting the activity of marine life. In order to be able to do so, it is necessary to control the diameter of the droplet that is generated when the liquid carbon dioxide is discharged from the discharge hole of the discharge pipe.
[0015]
The present invention provides a device for controlling the diameter of liquid carbon dioxide droplets discharged into the sea in the middle-layer dilution discharge system to discharge the carbon dioxide into the sea where the droplets are dissolved in the middle layer of the sea. Make it an issue.
[0016]
[Means for Solving the Problems]
How to discharge the carbon dioxide present invention to the ocean, the discharge hole by feeding the flow tube discharge liquid carbon dioxide while moving the discharge tubes forming a plurality of discharge holes from the ship that travels sea hanging into the sea It is assumed that the water is released from the sea . Then, it discharged into the sea to no 10mm deep initial diameter of the droplet in the sea in the range of 2500m from the release Nagareana of the tube release the 15mm of liquid carbon dioxide from 1500 m.
[0017]
The device for discharge of the carbon dioxide of the present invention to the ocean is discharged liquid carbon dioxide is fed into the discharge tube while moving the discharge tubes forming a plurality of discharge holes from the ship that travels sea hanging into the sea It is assumed that the water is released from the hole into the sea. And, the diameter of the discharge hole of the discharge pipe for discharging the liquid carbon dioxide into the sea is set to 3 mm to 10 mm so that the initial diameter of the droplet formed when the liquid carbon dioxide is discharged into the sea is 10 mm to 15 mm . .
[0018]
In this case, the device for discharge of carbon dioxide into the ocean, the number of Nagareana release of release flow tube is preferably equal to or greater than the number that is obtained by the following formula.
[0019]
n = Q / [(π / 4) · d ² · V]
However,
Q: Flow rate per unit time at which liquid carbon dioxide is discharged from the discharge hole of the discharge pipe,
V: discharge rate of liquid carbon dioxide discharged from the discharge hole = 5 cm / sec to 15 cm / sec;
d: diameter of discharge hole,
(Π / 4) · d ² : opening area of discharge hole.
[0020]
Further, in the apparatus for discharge of carbon dioxide into the ocean, the length of the discharge flow tube, to no 2000m and 4000 m.
In the method of discharging carbon dioxide to the ocean, the diameter of the discharge hole is set to 3 mm to 10 mm, and the discharge speed of the liquid carbon dioxide discharged from the discharge hole is set to 5 cm / sec to 15 cm / sec or less.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described.
[0022]
The present invention is directed to a discharge device that discharges the liquid carbon dioxide shown in FIGS. 1 to 3 to the ocean by a middle dilution discharge method. That is, the discharge apparatus employing the middle-layer dilution discharge method is configured to transfer the liquid carbon dioxide stored in the storage tank 3a mounted on the work boat 3 from a steel pipe suspended in the sea while being tiltably supported by the work boat 3 and suspended in the sea. Into the middle layer of the sea through a plurality of discharge holes 5 vertically arranged at, for example, the lower end of the discharge pipe 4. This is a discharge device of the type that moves forward while moving forward while discharging liquid carbon dioxide into the sea. The liquid carbon dioxide discharged into the sea from the discharge hole 5 of the discharge pipe 4 becomes droplets, and these droplets disperse into the sea and ascend into the sea while being ascended and diluted.
[0023]
The features of the discharge device of the present invention will be described with reference to FIG.
[0024]
As a result of various studies, the inventor of the present invention has found that a droplet 7 formed when liquid carbon dioxide is discharged from the discharge hole 5 of the discharge pipe 4 rises in the depth range of the middle layer in the sea. The initial diameter of the droplet 7 that can be dissolved has been found.
[0025]
That is, the discharge device of the present invention is capable of discharging liquid carbon dioxide into the sea from a large number of discharge holes 5 formed in the lower end portion of the discharge pipe 4 suspended from the work boat 3 into the sea. The liquid carbon dioxide is discharged from the discharge hole 5 of the discharge pipe 4 into the sea so that the initial diameter of the droplet 7 formed by the liquid carbon dioxide discharged to the water is 10 mm to 15 mm.
[0026]
Add a description. In the discharge device of the present invention, as shown in FIG. 1, the middle layer in the sea where liquid carbon dioxide is discharged from the discharge hole 5 of the discharge pipe 4 is set to have a depth of 1500 m to 2500 m from the sea surface SL. According to the conventional knowledge, the middle layer in the sea targeted by the discharge device targets the sea at a depth of 1000 m to 2000 m. However, based on the latest knowledge obtained by various studies by the inventors of the present invention, the depth of 1500 m from the sea surface was determined. A range of 2500 m from the liquid carbon dioxide, and found a concept of utilizing a phenomenon in which the liquid carbon dioxide rises while melting. The length of the discharge pipe 4 suspended from the sea at a depth of 1500 m to 2500 m is about 2,000 m to 4000 m in consideration of the inclination accompanying the traveling of the work boat 3. In other words, with this length, the discharge pipe 4 can be suspended from the sea of 1500 m to 2500 m even if the discharge pipe 4 is inclined up to 45 degrees by traveling of the work boat, and the discharge is performed by the middle-layer dilution discharge method. Becomes possible.
[0027]
Then, as shown in FIG. 1, the discharge device of the present invention is designed so that the initial diameter of the droplet 7 formed when the liquid carbon dioxide is discharged is 10 mm to 15 mm in the sea having a depth of 1500 m to 2500 m. In addition, liquid carbon dioxide is discharged from the discharge hole 5 of the discharge pipe 4 into the sea. All the droplets 7 having an initial diameter of 10 mm to 15 mm formed by the discharge of liquid carbon dioxide are dissolved in seawater and disappear in the course of rising in the sea by about 500 m to 1000 m.
[0028]
If the initial diameter of the droplet 7 is less than 5 mm, the rising height of the droplet 7 is short and the droplet 7 dissolves in seawater within a short period of time, and as a result, a water mass having a high concentration of carbon dioxide is generated. If the initial diameter of the droplet 7 exceeds 15 mm, the purpose of reaching the surface of the sea before the droplet is dissolved and isolating liquid carbon dioxide from the atmosphere becomes insufficient in the middle layer of the sea, Many adversely affect the activity of marine organisms living on the surface.
[0029]
As described above, in the sea having a depth of 1500 m to 2500 m, by discharging the liquid carbon dioxide while controlling the diameter of the droplet 7 to 10 mm to 15 mm, the liquid carbon dioxide can be removed at a rise of about 500 m to 1000 m. All can be dissolved in seawater. Therefore, the liquid carbon dioxide can be released into the middle layer of the sea and dissolved in the seawater by diluting the droplet 7 in the vertical direction, and the liquid carbon dioxide can be prevented from reaching the surface layer of the sea, and The purpose of the present invention is to release carbon into the sea and sequester the carbon, and to prevent adverse effects on the activities of marine organisms existing on the surface of the sea.
[0030]
FIG. 4 is a diagram obtained by trial calculation of the diameter change of each of the droplet rising in the downstream of the discharge pipe 4 and the droplet rising in still water. That is, it shows the process of decreasing the depth and decreasing the diameter as each of the droplets having a diameter of 5 mm, 10 mm, 15 mm and 20 mm generated in a sea of 1500 m in depth rises. According to this diagram, it can be seen that the droplet 7 having an initial diameter of 10 mm to 15 mm disappears as the distance increases from 500 m to 1000 m.
[0031]
Further, based on the knowledge that the inventor of the present invention specifies the initial diameter of the droplet 7 in the range of 10 mm to 15 mm, a specific technique for forming the droplet 7 having this specific initial diameter is described. As a result of various studies, it has been found that the initial diameter of the droplet 7 can be controlled by setting the diameter of the discharge hole 5 formed in the discharge pipe 4 to a specific range.
[0032]
That is, the discharge device of the present invention discharges the liquid carbon dioxide from the discharge hole 5 of the discharge tube 4 into the sea so that the initial diameter of the droplet 7 becomes 10 mm to 15 mm as described above. Is set in the range of 3 mm to 10 mm. That is, by setting the diameter of the discharge hole 5 formed in the discharge pipe 4 in the range of 3 mm to 10 mm, the initial diameter of the droplet 7 discharged from the discharge hole 5 can be controlled to 10 mm to 15 mm.
[0033]
If the diameter of the discharge hole 5 is less than 3 mm, it is impossible to control the diameter of the droplet on the 10 m m or more, also the diameter of the discharge hole 5 controls the diameter of the droplets exceeds 10mm to 15mm or less I can't. The ratio between the diameter of the droplet 7 and the diameter of the discharge hole 5 is considered to be in the range of about 1.5 to about 3 times.
[0034]
5 using simulated fluid corresponding to the liquid carbon dioxide and seawater is a graph showing the results of measuring the relationship between the liquid carbon dioxide discharge flow rate (droplet diameter d o _/ discharge hole diameter d _n). In the diagram, the CO ₂ simulated fluid used for the measurement indicated by □ is silicon oil (specific gravity 0.83), and the seawater simulated fluid is water + alcohol (specific gravity 0.84). Both have an interfacial tension of 5.6 dyne / cm. In the diagram, the CO ₂ simulated fluid used for the measurement indicated by ○ and Δ was silicon oil (specific gravity 0.95), and the seawater simulated fluid was water + alcohol (specific gravity 0.96). Both have an interfacial tension of 23.8 dyne / cm. The discharge hole diameter is 5 mm, the inclination angle of the discharge tube is about 45 degrees, and the direction of the discharge hole is upward.
[0035]
The line in the figure is the result calculated by the following evaluation formula.
[0036]
_{d 0 / d n = 1.31 {} d n 2 (γ w -γ co2) / σ} -0.3
However, _{d 0} is carbon dioxide droplet size, is _{d n} is a pore diameter, gamma _w seawater density, gamma _{of co2} is the liquid carbon dioxide density, sigma is the interfacial tension. It can be seen that the experimental results and the design results are in good agreement. It is d ₀ to consider a range of from 10mm to 15mm put the various values of the actual ocean middle layer in the above equation. That is, if the depth of the sea water temperature 2 to 3 ° C. at 1500mm, γ _w -γ _co2 is about 0.05, since the interfacial tension is a _{75dyne / cm, d 0 / d} n when _{d n} is 3mm is close to 3.1, _{d n} is the _d 0 / _{d n} when the 10mm approximates to 1.5. That, _{d n} is _{for d 0} is in the range of 10~15mm is that may be in the range of 3 to 10 mm.
[0037]
Further, the inventor of the present invention has set the diameter of the discharge hole 5 to 3 mm in order to generate droplets having an initial diameter in the range of 10 mm to 15 mm when discharging the liquid carbon dioxide from the discharge hole 5 of the discharge pipe 4. It has been found that in addition to the setting of from 10 mm to 10 mm, it is preferable to control the discharge rate of the liquid carbon dioxide as low as possible, specifically, 5 cm / sec to 15 cm / sec or less. That is, if the discharge speed of the liquid carbon dioxide is higher than the above range, it becomes difficult to control the initial diameter of the droplet within the range of 10 mm to 15 mm.
[0038]
The inventor of the present invention paid attention to the number of discharge holes 5 formed in the discharge pipe 4 in order to control the discharge speed of the liquid carbon dioxide within the above range. That is, the flow rate of the liquid carbon dioxide discharged from the discharge hole 5 is obtained by multiplying the opening area of the discharge hole, the number of the discharge holes, and the discharge speed, and is obtained by the following equation.
[0039]
n = Q / [(π / 4) · d ² · V]
However,
n: number of discharge holes,
Q Flow rate per unit time of discharging liquid carbon dioxide from the discharge hole of the discharge pipe,
V: discharge rate of liquid carbon dioxide discharged from the discharge hole,
d: diameter of discharge hole,
(Π / 4) · d ² : opening area of discharge hole.
[0040]
Then, 5 cm / sec to 15 cm / sec is inserted into the discharge velocity V of the liquid carbon dioxide discharged from the discharge hole in the above formula, and the number of the discharge holes is obtained by this formula. By setting the number of the discharge holes 5 of the discharge pipe 4 to be larger than the number of the discharge holes obtained by the above equation, the discharge speed V of the liquid carbon dioxide can be suppressed to 5 cm / sec to 15 cm / sec or less. It becomes.
[0041]
For example, when the flow rate is 100 cm ³ / sec, the diameter of the discharge hole 5 is 0.5 cm, and the discharge speed is 10 cm / sec, the number of the discharge holes 5 is about 50,000 according to the above equation. That is, it is found that the discharge speed can be adjusted to 10 cm / sec by forming the discharge holes 5 of 50,000 or more.
[0042]
By setting the diameter of the discharge hole 5 formed in the discharge pipe in this way from 3 mm to 10 mm, and more preferably, setting the discharge rate of liquid carbon dioxide to 5 cm / sec to 15 cm / sec or less as low as possible, 7 can be precisely controlled in the range of 10 mm to 15 mm.
[0043]
One specific example will be described. In order to discharge 100 kg / sec of liquid carbon dioxide (corresponding to carbon dioxide emitted from 500,000 to 1,000,000 coal-fired power plants), a discharge pipe having a diameter of several 10 cm and a length of 2500 m is used. Was suspended at 5 knots to discharge liquid carbon dioxide from the discharge pipe into the sea. Then, when the released carbon dioxide droplets were elevated 1000 m in the sea until the dissolution of the droplets in the seawater was completed, a dilution ratio of about 50,000 times was obtained, and the pH of the seawater could be suppressed to about 6.8.
[0044]
The present invention is not limited to the above-described embodiment, but can be implemented with various modifications.
[0045]
【The invention's effect】
As described above, according to the apparatus for discharging liquid carbon dioxide into the ocean according to the present invention, liquid carbon dioxide is discharged into the sea from the discharge hole of the discharge pipe by controlling the initial diameter of the droplet to a specific value. Then, the liquid carbon dioxide droplets released in the middle layer of the sea are dissolved in seawater within the depth of this middle layer, and all the liquid carbon dioxide is dissolved in the seawater without affecting the activity of marine life Can be made. Therefore, according to the present invention, there is provided an apparatus for controlling the diameter of liquid carbon dioxide droplets discharged into the sea in the middle-layer dilution discharge system to discharge the carbon dioxide into the sea so that the droplets are dissolved in the middle layer of the sea. Obtainable.
[0046]
Further, according to the present invention, the diameter of the discharge hole formed in the discharge pipe is set to a specific range, and more preferably, the discharge rate is controlled by setting the number of the formation holes formed in the discharge pipe to a specific range. Thus, the initial diameter of the droplet can be accurately controlled to have a specific value.
[0047]
Further, by specifying the length of the discharge pipe suspended from the workboat, it is possible to discharge liquid carbon dioxide in the middle seawater having a depth of 1500 m to 2500 m.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a discharge device of the present invention.
FIG. 2 is a diagram schematically showing a system for discharging water by the discharge device of the present invention.
FIG. 3 is a view showing the behavior of droplets generated by discharging carbon dioxide from a discharge pipe provided in a discharge device.
FIG. 4 is a diagram showing a change in droplet diameter when a droplet generated by discharging carbon dioxide from a discharge pipe provided in a discharge device rises in water.
FIG. 5 is a diagram showing the results of an experiment in which a simulated fluid is discharged from a discharge pipe and the relationship between the flow rate and the droplet diameter / discharge hole is examined.
FIG. 6 is a diagram showing a phase state of carbon dioxide.
[Explanation of symbols]
2. Carrier,
3. Work boat,
3a ... storage tank,
4 ... discharge pipe,
5 ... discharge hole,
6: carbon dioxide after discharge 7: droplets,
8 ... vortex,
9… Floating flow field.

Claims (5)

A method of sending liquid carbon dioxide to the discharge pipe while suspending and moving a discharge pipe having a large number of discharge holes from a ship traveling on the sea into the sea, and discharging carbon dioxide discharged into the sea from the discharge hole to the ocean. At
It initial diameter of the droplet is not 10mm the sea depth ranging 2500m from 1500m you characterized in that discharge into the sea of the liquid carbon dioxide 15mm from the discharge hole of the discharge tube of carbon dioxide into the ocean How to release. In an apparatus for discharging liquid carbon dioxide into the discharge pipe while discharging and moving the discharge pipe formed with a large number of discharge holes from the ship traveling on the sea to the discharge water while moving it underwater,
The discharge pipe for discharging the liquid carbon dioxide into the sea has a diameter of 3 mm to 10 mm so that the initial diameter of the droplet formed when the liquid carbon dioxide is discharged into the sea is 10 mm to 15 mm. device for discharge of carbon dioxide you wherein there marine. Device for discharge of carbon dioxide according to the ocean in claim 2, wherein the number of the discharge hole of the discharge tube is not less than the number that is obtained by the following formula.
n = Q / [(π / 4) · d ² · V]
However,
Q: Flow rate per unit time at which liquid carbon dioxide is discharged from the discharge hole of the discharge pipe,
V: discharge rate of liquid carbon dioxide discharged from the discharge hole = 5 cm / sec to 15 cm / sec;
d: diameter of discharge hole,
(Π / 4) · d ² : opening area of discharge hole. The apparatus for discharging carbon dioxide to the ocean according to claim 2 , wherein the length of the discharge pipe is 2000m to 4000m. 3. The apparatus according to claim 2, wherein the discharge speed of the liquid carbon dioxide discharged from the discharge hole is 5 cm / sec to 15 cm / sec or less.

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