KR20130078836A - Method for isolation of carbon dioxide contained in the exhaust gas on the bottom of the deep sea - Google Patents

Abstract

PURPOSE: A method for isolating carbon dioxide included in exhaust gas into deep seabed is provided to increase the dissolution rate of exhaust gas containing carbon dioxide by dissolving the exhaust gas in deep seawater of a low temperature. CONSTITUTION: A method for isolating carbon dioxide included in exhaust gas into deep seabed comprises the steps of: cooling exhaust gas containing carbon dioxide; supplying the exhaust gas to an absorbing tower (2) filled with an absorbent (3) represented by AMO2; discharging exhaust gas without carbon dioxide through a chimney (6); heating carbon dioxide absorbed on the absorbent; collecting emitted carbon dioxide in a carbon dioxide collecting tank (8); and dissolving the emitted carbon dioxide in seawater in order to isolate the carbon dioxide into deep seabed. In AMO2, A is an alkaline metal such as Li, Na, K, Rb, and Cs; and M is a metal such as Mn, Fe, Co, Ni, and Cu. [Reference numerals] (AA) Exhaust gas; (BB) Denitrification process; (CC) Dust collection process; (DD) Desulfurization process; (EE) Gas containing CO2; (FF) Cooling process; (GG) Atmosphere; (HH) Sea surface

Description

Method for isolation of carbon dioxide contained in the exhaust gas on the bottom of the deep sea}

The present invention relates to a method for isolating carbon dioxide contained in the exhaust gas in the deep seabed, and more particularly, exhaust gas from the chimney of the thermal power plant, exhaust gas from the chimney of the steel mill, exhaust from the chimney of the cement plant In the method of dissolving carbon dioxide trapped in the seawater by the TSA (Temperature swing adsorption) method in the exhaust gas containing carbon dioxide, such as the exhaust gas emitted from the gas and industrial factory boiler chimney, it is isolated in the seabed It is about.

Carbon dioxide emissions are increasing with the development of industry, and the concentration of carbon dioxide in the atmosphere was about 280ppm before the Industrial Revolution, and now it is over 380ppm with the increase of carbon dioxide with the development of industry.

Carbon dioxide has a strong absorption band in the wavelength range of 2.5 to 3 μm and 4 to 5 μm of infrared rays, so it is a so-called greenhouse effect gas that prevents heat from the earth to diffuse into space. In addition, as the amount of dissolved dissolved in the seawater increases, the seawater acidifies and adversely affects the ecosystem.

Therefore, the Kyoto Protocol has proposed targets to reduce greenhouse gas emissions containing carbon dioxide, and each country has agreed to reduce carbon dioxide emissions. Therefore, specific methods for carbon dioxide treatment have to be devised.

Patent Literature 1 Japanese Patent Laid-Open No. 2011-31154 discloses an aquifer of 5 to 50 atmospheric pressures in which underground water, sea water, or brine is present when carbon dioxide is pressurized by a pressurization device. Iv) to store the carbon dioxide (이산화탄소, storage) by supplying, but there is a problem that consumes enormous power ratio because carbon dioxide must be pressurized in the pressurizing device.

Patent Document 2 Japanese Patent Laid-Open No. 2009-119463 discloses that a carbon dioxide-containing exhaust gas is supplied to a compressor to a CO ₂ hydrate generating apparatus provided in a sea capable of producing carbon dioxide hydrate (CO ₂ hydrate). After contacting with seawater to produce CO ₂ hydrate by using sea water pressure, the method of depositing the generated CO ₂ hydrate on the seabed and storing it on the seabed has been proposed. There is a problem in that the power cost is high because it must be compressed and supplied to the CO ₂ hydrate generator.

Patent Document 3 Japanese Patent Laid-Open No. 2005-262001 and Patent Document 5 Japanese Patent Laid-Open No. 09-103631 disclose a carbon dioxide separation recovery system using a pressure swing adsorption (PSA) method. Has a problem that the power ratio is high because the entire exhaust gas must be compressed to less than 20 Vol%.

Patent Document 4 Japanese Patent Laid-Open No. 2000-70702 supplies low-purity carbon dioxide gas to the lower end of a short-circuit pipe of an inverted J-shaped pipe installed in a seawater as a gas lift device. There is a method of sending the dissolved in the seawater to the deep sea, but there is a problem that the high power cost is required to supply a low-purity carbon dioxide gas to the bottom of the reverse J pipe.

And non-Patent Document 1 to Non-Patent Document 4 in the above-mentioned patent document or CO ₂ The technology presented only the characteristics and phenomena such as the phenomenon of ocean isolation technology development, the deep sea storage of carbon dioxide, the oceanic fixation of carbon dioxide, the phenomenon of CO _{2 in} the deep sea, the effect of CO ₂ injection into the deep sea, and are nothing more than the prior art.

The technique proposed in the non-patent document 5 is the technique which presented the content and characteristic of the technique of the patent document 3, This also is only a conventional technique.

[Patent Document 1] Japanese Patent Laid-Open No. 2011-31154, Carbon Dioxide Storage of Carbon Dioxide, February 17, 2011 [Patent Document 2] Japanese Patent Laid-Open No. 2009-119463, Method for Generating Gas Hydrate in Sea and Gas Hydrate Generating Apparatus, June 04, 2009 ) [Patent Document 3] Japanese Patent Publication No. 2005-262001, Carbon Dioxide Separation Recovery System (September 29, 2005) [Patent Document 4] Japanese Patent Application Laid-Open No. 2000-70702, Method and apparatus for dissolving low-purity carbon dioxide gas in seawater and sending it to the deep sea. ), (March 07, 2000) [Patent Document 5] Japanese Patent Application Laid-Open No. 09-103631, Pressure Swing Adsorption Method (April 22, 1997)

[Non-Patent Document 1] Ryouyu Yuu, Yamane Kenji, Nagajima Yasuharu, CO2 Marine Isolation Technology Development (CO2 海洋 隔離 技術 開發 の 現狀), Japan Marine Engineering Journal of the Korean Society for International Medicine, Vol. 40, No. 2 (July 2005) [Non-Patent Document 2] Yamane Kenji, Ryou-Yu Yu, Research on Deep-Storage Carbon Dioxide, Journal of the Korean Society of Ship and Ocean Engineers No. 58 (January 2003) [Non-Patent Document 3] Saiyuki Takayuki, High Efficiency Ocean Fixation of Carbon Dioxide, Korea Institute of Resources and Environment Technology, 1997 Sep 09 Monthly issue [Non-Patent Document 4] Steinberg, M., in Discussions at Deep Sea and CO2 2000, Ship Res. Inst., Tokyo, (2000) [Non-Patent Document 5] Toshinaga Kawai, Combining Pressure Swing Technology, Industrial Engineering, 1986

The present invention, in order to solve the problems in the prior art, the exhaust gas discharged from the boiler combustion process and production process of the fertilizer plant, power plant or industrial plant, the exhaust gas discharged from the steel mill, discharge from industrial plants such as cement plants The purpose of the present invention is to provide a method of dissolving carbon dioxide contained in exhaust gas discharged from various fermentation processes and carbon dioxide trapped by TSA (Temperature swing adsorption) method in seawater and sequestering it in deep seabed. have.

In order to achieve the above object, the present invention provides an exhaust gas discharged from a boiler combustion process and a production process of a fertilizer plant, a power plant or an industrial plant, an exhaust gas discharged from a steel mill, an exhaust gas discharged from an industrial plant such as a cement plant, or In the method for sequestering the carbon dioxide contained in the exhaust gas discharged from the various fermentation process in the seabed depth,

A cooling step of cooling the exhaust gas containing carbon dioxide and treating the exhaust gas containing carbon dioxide having a reduced temperature;

The cooled exhaust gas containing carbon dioxide is sent to the adsorption tower filled with the adsorbent, the exhaust gas from which the carbon dioxide is adsorbed and removed from the adsorbent is discharged to the chimney, and the carbon dioxide adsorbed by the filler in the adsorption tower is released by heating. Adsorption and collection step of collecting carbon dioxide into the carbon dioxide collection tank,

The carbon dioxide in the carbon dioxide capture tank is characterized in that the step consisting of dissolving the carbon dioxide by dissolving in sea water to discharge to the seabed deep.

The present invention has a high dissolution rate effect when the exhaust gas containing carbon dioxide is dissolved in deep sea water at low temperature, and in the case of exhaust gas having a low carbon dioxide content of 12 to 20%, the high pressure compressed by a conventional compressor. Compared to the PSA method, which absorbs gas at low temperatures and collects high concentrations of carbon dioxide at low pressure and high temperature, the TSA method has a lower operating cost, so it is widely used to treat carbon dioxide in areas where low temperature deep sea water can be collected. It is believed to be.

1 is a process diagram for sequestering carbon dioxide contained in exhaust gas in a seabed depth
2 is a cross-sectional view of the suction device (吸引 裝置)
3 is a general exhaust gas treatment process diagram
4 is the solubility of carbon dioxide in water with pressure and temperature changes
5 is a phase diagram of carbon dioxide (CO ₂ ) -sea water (H ₂ O) -carbon dioxide hydrate.
Figure 6 is a pressure-phase diagram (Pessure-temperature phase diagram of carbon dioxide) of CO ₂ with temperature

The present invention is the exhaust gas emitted from the boiler combustion process and production process of the fertilizer plant, power plant or industrial plant, the exhaust gas from the steel mill, the exhaust gas from industrial plants such as cement plants, exhaust from various fermentation processes Carbon dioxide trapped in the sea water by the TSA (Temperature swing adsorption) method, which emits carbon dioxide adsorbed on the adsorbent at low temperature, such as the exhaust gas containing carbon dioxide (CO ₂ ) at low temperature A method of sequestration at the bottom of the ocean is presented.

Currently, the general process of treating the exhaust gas discharged from the combustion process, the denitrification treatment, dust collection treatment, desulfurization treatment is sequentially exhausted to the chimney as shown in Figure 3, in the present invention, the denitrification treatment, dust collection treatment, desulfurization de-CO ₂ to the carbon dioxide contained in the exhaust gas is processed It suggests how to treat and then discharge into the chimney.

The inventors of the present invention intensively examined an adsorbent that has a high adsorption rate of carbon dioxide at a low temperature and is easily released at a high temperature. ), A mixture of 100 to 120 moles of carbonates of alkali metals such as sodium (Natrium, Na), potassium (Kalium, K), rubidium (Rubidium, Rb), and cesium (Cesium, Cs) When calcined at 900 to 1000 ° C. for 10 to 20 hours, AMO ₂ (wherein A = Li, Na, K, Rb, Cs is an alkali metal such as M = Mn, Fe, Co, Ni, Cu, etc.). Solid solution compound). The solid solution was the compound is extremely excellent in the adsorption capacity of the carbon dioxide, in particular M is Fe is, A was found to be the case of K and Na is excellent in absorption capacity of the CO _2.

① Preparation of AMO ₂ , a carbon dioxide adsorbent

A ₂ CO ₃ + M ₂ O ₃ ―Heating (900 ℃) → 2AMO ₂ + CO ₂ ... ... ... ... ... ... ... ... (One)

② CO2 adsorption reaction

2AMO ₂ + CO ₂ Cooling → A ₂ CO ₃ + M ₂ O ₃ ... ... ... ... ... ... ... ... ... ... ... (2)

A ₂ CO ₃ + CO ₂ + H ₂ O—cooling → 2AHCO ₃ ... ... ... ... ... ... ... ... ... ... ... (3)

Adsorption reaction

2AMO ₂ + 2CO ₂ + H ₂ O ―Cooling → 2AHCO ₃ + M ₂ O ₃ ... ... ... ... ... ... ... ... (4)

③ carbon dioxide emission reaction

2AHCO ₃ -heated → A ₂ CO ₃ + CO ₂ + H ₂ O... ... ... ... ... ... ... ... ... ... ... ... ... (5)

A ₂ CO ₃ + M ₂ O ₃ ― Heating → 2AMO ₂ + CO ₂ ... ... ... ... ... ... ... ... ... ... ... ... (5)

Release reaction

2AHCO ₃ + M ₂ O ₃ Heating → ₂ AMO ₂ + 2CO ₂ + H ₂ O... ... ... ... ... ... ... ... ... (7)

As seen in the reaction, AMO ₂ captures high concentrations of carbon dioxide while adsorbing and releasing carbon dioxide by a temperature swing.

In addition, the high concentration of carbon dioxide is dissolved in low-temperature deep sea water, and the conditions under which it can be safely sequestered in deep seabed are as follows.

1. The dissolution of CO ₂ in water is efficient at high pressure and low temperature.

Solubility in water of carbon dioxide, as shown in Figure 4 'solubility in water of carbon dioxide according to pressure and temperature changes', the melting efficiency is increased at low temperature and high pressure.

Therefore, it is desirable to use deep ocean water with low carbon dioxide temperature.

The deep ocean water is characterized by the melting of glaciers in the Arctic and Antarctic sediments at sea level due to the difference in density. Normally, deep ocean water is deeper than 200m above sea level and maintains a constant water temperature throughout the year.

In particular, the deep ocean waters on the east coast of Korea are blocked by the Japanese archipelago, and the water temperature is lower than that of other regions (Pacific coast in east Japan, Hawaii, USA, and Atlantic Ocean in Europe) due to the slow flow of algae. On the coast of Toyama Prefecture, Japan, and on the coast of Kona, Hawaii, USA, the deep ocean water, which is 200m deep, exists at 8 to 10 ° C. In the case of deep sea water 200 m deep from the sea level, it is characterized by a constant low temperature around 2 ℃ annually. Therefore, Korea CO ₂ hydrate on the East Coast power plants, cement plants, steel mills, petrochemical plants seabed depth deep ocean water dissolved CO ₂ processing of the exhaust gas containing carbon dioxide by using the deep ocean water as the absorbent is discharged from that (CO ₂ Isolation in the hydrate state is the most economical and safe process compared to other treatment methods.

2. Carbon dioxide is dissolved in sea water and CO ₂ hydrate (CO ₂ The conditions under which hydrates are generated are as follows.

As shown in FIG. 5 'Phase diagram of carbon dioxide (CO ₂ ) -sea water (H ₂ O) -carbon dioxide hydrate', CO _{2 which is a} clathrate compound (包 接 水 和 物) in a solid state The production of hydrate (CO ₂ -hydrate) is produced at a temperature of 10.5 ° C. or less when the pressure is 4.468 MPa or more. In this manner is referred to as water, liquid CO _2, gaseous CO _2, it points to the four-phase coexisting (相) of CO ₂ hydrate emphasis 4 (四重點, Quadruple Point), CO 2 The formation reaction of the hydrate is as follows.

CO ₂ + nH ₂ O—CO ₂ · nH ₂ O (CO ₂ -hydrate)... ... ... ... ... ... ... ... (8)

In the reaction scheme (8), the hydrated water n is found to be 5-8, and CO ₂ The specific gravity of the hydrate is about 1.1, which is larger than the specific gravity 1.023 (24 ° C) of the seawater, and is precipitated in the sea bottom in the seawater. In water with a water temperature of 10.5 ° C or higher, CO ₂ The production of hydrates is difficult.

So, the possible intake of cold deep ocean water, CO area of deep ocean water absorbs the CO _{2 2} It is economical and most stable to inject hydrates into the subsea depth where they can be produced.

In other words, the deep ocean water absorbing CO ₂ in the absorption process should be sequestered in the deep seabed where the water temperature is 10.5 ° C or less and the water pressure is 45mH ₂ O (45m depth) or more.

Indeed, in the deep sea bed of Korea, methane hydrate and CO ₂ Hydrate (CO ₂ hydrate) was found to be present in significant amounts.

3. The water temperature is over 10.5 ℃ and CO ₂ Isolate to the seabed where no hydrate is formed

CO ₂ when the water temperature is above 10.5 ℃ Because it does not form hydrates, it must be sequestered in water or liquid carbon dioxide.

In deep seabeds, where there is no deep sea water at temperatures below 10.5 ° C, CO ₂ No hydrate is present, and carbon dioxide is dissolved in water or in a liquid carbonate state.

It was confirmed that a liquid carbon dioxide pool existed at the seabed of 1380m depth in Yonaguni Island, Okinawa Prefecture.

If the water temperature is 10.5 ℃ or higher, CO ₂ If it cannot be sequestered in the hydrated state, it should be sequestered at the point where the head pressure becomes below the critical temperature of carbon dioxide of 31.1 ° C and higher than the critical pressure of 7.382 MPa.

The critical point of carbon dioxide (Critical point) is, Figure 6 - is 31.1 ℃, 7.382MPa, as shown in "Phase Equilibrium pressure of CO ₂ with temperature also (Pessure-temperature phase diagram of carbon dioxide) '. It should not be sequestered at the point where the water temperature is above the critical temperature of carbon dioxide 31.1 ℃.

Hereinafter, a method for safely sequestering carbon dioxide contained in exhaust gas in a seabed depth with reference to the accompanying drawings will be described in detail.

Ⅰ. Cooling stage

Exhaust gas from fertilizer plant, power plant or industrial plant boiler combustion process and production process, exhaust gas from steel mill, cement plant, exhaust gas from industrial plant such as cement plant, exhaust gas from various fermentation process Since the exhaust gas containing carbon dioxide (CO ₂ ) is generally high in temperature, the exhaust gas is sent to the cooling process by the exhaust gas transport fan (1) to cool the exhaust gas containing carbon dioxide below 30 ° C. At this time, since the cooled temperature is so good that there is no restriction | limiting in particular in the temperature of a riverbank.

The chiller of the cooling process uses a tube and shell heat exchanger type or a gas-liquid contact heat exchanger.

Ⅱ. Adsorption and collection step

For containing the cooled carbon dioxide, exhaust gas is supplied to the adsorption tower (2) reaction of adsorption and release the adsorbent (3) mechanism (Mechanism), in the adsorbent AMO ₂ A is K, M is Fe is, KFeO _second adsorbent The reaction mechanism for adsorbing and releasing carbon dioxide is described as follows.

① Adsorption process

When the exhaust gas cooled by the exhaust gas containing the carbon dioxide is sent to the adsorption tower 2 filled with the adsorbent 3, the carbon dioxide is adsorbed to the adsorbent 3, and the carbon dioxide adsorbed to the adsorbent 3 to remove the exhaust gas. Send it to the chimney and exhaust it. The adsorption reaction occurring at this time is shown in the following reaction formula (9).

2KFeO ₂ + 2CO ₂ + H ₂ O ―Cooling → 2KHCO ₃ + Fe ₂ O ₃ ... ... ... ... ... ... ... ... (9)

② Release process

The carbon dioxide adsorbed to the adsorbent 3 is heated to 190 to 210 ° C. by a heating tube 4 installed outside the adsorption tower 2, and the carbon dioxide is desorbed and released. The carbon dioxide released is sent to the carbon dioxide capture tank (8). The desorption reaction occurring at this time is shown in the following reaction formula (10).

2KHCO ₃ + Fe ₂ O ₃ Heating → ₂ KFeO ₂ + 2CO ₂ + H ₂ O... ... ... ... ... ... ... ... ... (10)

As shown in the reaction schemes (9) and (10), 1 mole of the adsorbent KFeO ₂ (AMO ₂ ) is CO _{2 in the} cooled low temperature state. Adsorbs 1 mole, and when heated to a high temperature, CO ₂ One mole is released.

As for the structure of the adsorption tower 2, the heating tube 4 and the heat insulating material 5 are installed in the exterior of the adsorption tower 2, as shown in FIG. By heating, or instead of the heating tube 4, a heating jacket may be provided, or an autoclave which is an electric heating system.

The amount of the adsorbent 3 charged to the adsorption tower 2 is determined in consideration of the concentration of carbon dioxide contained in the exhaust gas, the flow rate, and the adsorption time. However, the adsorption time is 4 to 8 hours, and the adsorption tower 2 is cooled. The operation of adsorbing carbon dioxide through an exhaust gas containing carbon dioxide is carried out, and the operation of heating and releasing and regenerating carbon dioxide adsorbed to the adsorbent 3 in the other adsorption column 2 is alternately performed. .

The structures of the carbon dioxide capture tank silpit (7) and the carbon dioxide capture tank (8) are spherical and are mounted in the water of the spherical carbon dioxide capture tank silpit (7). ) To store the collected carbon dioxide, and the storage capacity is 8 to 12 hours.

Ⅲ. Sequestering Carbon Dioxide in Deep Seabeds

The carbon dioxide collected in the carbon dioxide collection tank 8 sends the seawater collected by the seawater intake pump 9 to the liquid flow path 10a of the carbon dioxide suction device 10 and passes through the nozzle part 10b to Bernoulli's theory (Bernoulli's). The carbon dioxide trapped in the carbon dioxide capture tank 8 is sucked through the gas flow path 10c through the gas-liquid mixing flow path 10d, and then dissolved in the seawater while passing through the deep sea bottom discharge pipe 12. Send it to deep seabed for quarantine.

The carbon dioxide suction device 10 has a structure similar to that of an aspirator in a laboratory, as shown in FIG. 2, a cross-sectional view of the suction device, and sucks seawater with a seawater intake pump 9. When it is supplied to the liquid flow path 10a of the c) and passes through the nozzle part 10b, the carbon dioxide collected in the carbon dioxide collection tank 8 is sucked into the gas flow path 10c by Bernoulli's theory, Together with the gas-liquid mixing passage (10d) is sent to the deep seabed through the deep sea bottom discharge pipe (12).

The seawater intake pipe 11 connects PE (Polyethylene) or PP (Polypropylene) pipes with excellent flame resistance to mooring ropes, and has a tsunami caused by waves or earthquakes caused by typhoons. An anchor is installed so that it is not damaged by the ripple effect, and it is fixed to the bottom of the sea and installed to the intake point. At the end of the seawater intake pipe (11), a water basin (13) is connected by a pipe and a flange, and a light weight bag (14) is installed at the end of the pipe. In order to prevent the inflow of deposited soil on the seabed surface, it should be installed 10 ~ 20m away from the seabed surface.

And when the seawater intake pipe (11) is installed in the form of a pigtail (pig-tail) in the Haisan or Haikou area as the gas fills the floor of the convex portion of the pipe, the intake amount is gradually In addition, since a vapor-lock phenomenon is caused to prevent water intake, a vapor vent hole is installed at a point where a vapor-lock phenomenon may occur. The gas must not be charged to prevent the vapor-lock phenomenon.

And the deep sea bottom discharge pipe 12 is also installed to the required point in the same way as the sea water intake pipe (11).

The sea water intake method is installed in the pump room by lowering the seawater intake pump 9 at the tip of the seawater intake pipe 9 at 3 to 4m lower than the sea level so as to prime the seawater as shown in FIG. It may be set at a low 3-4m, and water may be taken in accordance with the siphon principle.

The carbon dioxide is dissolved into the seabed by discharging the seawater dissolved in the deep sea, carbon dioxide hydrated CO ₂ hydrate (CO ₂ hydrate) may be produced. Alternatively, the carbon dioxide is sequestered in the deep seabed where the critical point of temperature is below 31.1 ° C and the pressure is above 7.382MPa.

The carbon dioxide is CO ₂ hydrate (CO ₂ Carbon dioxide is sequestered in the deep seabed where water temperature that can produce hydrates is 10.5 ℃ or less and head pressure is 45mH ₂ O or more. However, considering the flow of tides, waves caused by typhoons, tsunamis caused by earthquakes, upwelling, etc., the water temperature is 500m below sea level even if the temperature is below 10.5 ℃. It is desirable to sequester carbon dioxide in deeper seabed depths.

At seasides where water temperature is not able to withdraw deep ocean water below 10.5 ° C, the head pressure is 74 mH _{2 for} seawater that has dissolved CO ₂ contained in exhaust gas using surface seawater with a critical temperature of 31.1 ° C or lower. It should be sequestered above the seabed deeper than O. In this case, it is preferable to sequester carbon dioxide in a deep seabed that is deeper than 500m above sea level even if the water temperature is lower than 31.1 ° C in view of tidal currents, waves caused by typhoons, tsunamis caused by earthquakes, and water rise.

When the exhaust gas containing the carbon dioxide of the present invention is dissolved in deep sea water at low temperature, the exhaust gas having high dissolution efficiency and low carbon dioxide content of 20% or less has a simple facility in which TSA method is simple, so that the facility cost is low and the cost of accident is high. It is expected to be widely used for treating carbon dioxide in an area where low temperature deep sea water can be easily taken in due to various characteristics such as low cost.

1: exhaust gas transfer blower 2: adsorption tower
3: adsorbent 4: heating tube
5: insulation material 6: chimney
7: Carbon dioxide capture tank seal pit 8: Carbon dioxide capture tank
9: seawater intake pump 10: suction device
10a: liquid flow path 10b: nozzle part
10c: gas flow path 10d: gas-liquid mixture flow path
11: seawater intake pipe 12: deep sea discharge pipe
13 Sugadae 14: Units
G / L: Ground Level

Claims (1)

In the method for sequestering carbon dioxide in the deep seabed in the exhaust gas containing carbon dioxide (CO ₂ ),
A cooling step of treating the exhaust gas containing carbon dioxide with exhaust gas containing carbon dioxide cooled in a cooling process;
The cooled exhaust gas containing carbon dioxide was adsorbed with an adsorbent AMO ₂ (A is an alkali metal such as Li, Na, K, Rb, Cs, and M = Mn, Fe, Co, Ni, Cu, etc.). The exhaust gas adsorbed and removed by supplying to the exhaust gas is discharged through the chimney, and the carbon dioxide adsorbed on the adsorbent is adsorbed and collected to collect the released carbon dioxide into the carbon dioxide collection tank,
The released carbon dioxide is dissolved in seawater to sequester carbon dioxide in the deep seawater, wherein the carbon dioxide contained in the exhaust gas is sequestered in the seabed deep seawater.

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