KR20130073783A - Method of isolating carbon dioxide contained in the exhaust gas in the bottom of the sea depths using sea water - Google Patents

Abstract

PURPOSE: A method of separating carbon dioxide from the exhaust gas which contains carbon dioxide is provided to have high dissolution rate by being dissolved to the low temperature of deep sea water and cost cheap for the operation compared to the absorbing method in high pressure by compressing with the conventional compressor. CONSTITUTION: A method of separating carbon dioxide from the exhaust gas which contains carbon dioxide comprises the following steps. A step of processing the exhaust gas which contains carbon dioxide that was cooled in the cooling process; a step of supplying the cooled exhaust gas including carbon dioxide to the lower part of the absorptive tower by being upwardly returned to the packed layer (3) of the absorptive tower (2) and being supplied to the exhaust gas suction apparatus (5); a step of removing carbon dioxide from the exhaust gas as the carbon dioxide contained to the exhaust gas is absorbed to sea water by supplying the sea water to the upper portion of the packed tower to contact the exhaust gas and ejecting the exhaust gas which removed carhon dioxide to the air by being sent to the chimney (6) through the upper section of the absorbtive tower; a step of absorbing carbon dioxide to the seawater and dissolving it by ejecting the seawater which abosorbed and dissolved carbon dioxide to the lower part of the absorption tower; a step of separating carbon dioxide in the deep ocean floor by ejecting the sea water which absorbs and dissolves carbon dioxide to the deep ocean floor. [Reference numerals] (AA) CO2-containing gas; (BB) Cooling process; (CC) Atmosphere; (DD) The surface of the sea

Description

Method of isolating carbon dioxide contained in the exhaust gas in the bottom of the sea depths using sea water}

The present invention relates to a method for sequestering carbon dioxide (CO ₂ ) contained in the exhaust gas, and more particularly, exhaust gas from a thermal power plant chimney, exhaust gas from a steel mill chimney, exhaust gas from a chimney of a cement plant, and an industrial plant. The present invention relates to a method for dissolving carbon dioxide in seawater in an exhaust gas containing carbon dioxide, such as exhaust gas in a boiler chimney, and separating it into a deep seabed.

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.

Since carbon dioxide dissolves in water, Patent Literature 1 JP-A-2011-31154 discloses that underground water pressure 5 in which ground water, sea water, or brine is present is that carbon dioxide is pressurized by a pressurizing device. Although a method of storing carbon dioxide by supplying it to the aquifer of ˜50 atm is presented, there is a problem in that a huge power ratio is consumed because carbon dioxide must be pressurized by a pressurizing device.

Patent Document 2 Japanese Patent Application Laid-Open No. 2010-207761 discloses that sodium bicarbonate (NaHCO ₃ ) and ammonium chloride (NH ₄ Cl) are produced by treating exhaust gas containing carbon dioxide with a saturated solution by dissolving ammonia in seawater. Carbon dioxide is absorbed.

NaCl + H ₂ O + NH ₃ + CO _2- > NaHCO ₃ + NH ₄ Cl... ... ... ... ... ... ... (One)

The solution containing sodium bicarbonate and ammonium chloride produced by absorbing carbon dioxide in ammonia saturated seawater is sequentially sprayed using the pressure of the exhaust gas, and simultaneously cooled by using the heat of vaporization of the solvent in the solution, and hydrogencarbonate in the solution. The method of recovering carbon dioxide by precipitating sodium and ammonium chloride has been proposed, but the problem of high cost of recovering sodium bicarbonate and ammonium chloride, and the recovered sodium bicarbonate are used as heavy tanks, and ammonium chloride is used as fertilizer. Ultimately, there is a problem in that carbon dioxide is not a stable treatment method.

Patent Document 3 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 generating 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 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.

Patent Document 5 Japanese Patent Application Laid-open No. Hei 8-103649 is a technique almost identical to that of Patent Document 4, both of which are developed by inventor Takayuki Saito. There is a problem in that it is difficult to send dissolved gas (CO ₂ ) to the deep sea because it is not exhausted from the sea gas, but this also requires a high power cost.

And non-Patent Document 1 to non-Patent Document 6 in the above-mentioned patent document, or carbon dioxide to 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.

[Patent Document 1] Japanese Patent Laid-Open No. 2011-31154, Carbon Dioxide Storage of Carbon Dioxide, February 17, 2011 [Patent Document 2] Japanese Patent Publication No. 2010-207761, Method and System for Removing Carbon Dioxide from Flue Gas Using Seawater, (September 24, 2010) ) [Patent Document 3] Japanese Patent Publication No. 2009-119463, Method for generating gas hydrates in sea and gas hydrate generating apparatus (Gas Heidle), (June 04, 2009) ) [Patent Document 4] Japanese Patent 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. Hei 8-103649, Method for Underwater Isolation of Gas Carbon Dioxide and Its Apparatus, (April 23, 1996)

[Non-Patent Literature 1] Ryouyu Lee, Kenji Yamane, Yasuharu Nakajima, Development of CO2 Marine Isolation Technology (CO2 海洋 隔離 技術 開發 の 現狀), Journal of Japan Marine Engineering Society日本 マ リ ン エ ン ニ ア リ ン グ 學會 誌, 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] Saito Takayuki, Highly Efficient Offshore Fixed Technology of Carbon Dioxide, Korea Institute of Resources and Environment Technology, 1997 September, 2017 [Non-Patent Document 4] Steinberg, M., in Discussions at Deep Sea and CO2 2000, Ship Res. Inst., Tokyo, (2000) [Non-Patent Document 5] Yamane, K., et al, “Two Types of Strength Abnormality of CO2 Hydrate Membrane”, Greenhouse Gas Control Technologies, CSIRO, pp. 492-498, (2001) [Non-Patent Document 6] Barry, J.P., K.R. Buck, C.F. Lovera, L. Kuhnz, P.J. Whaling, E.T. Peltzer, P. Walz, and P.G. Brewer, 2004: Effects of direct ocean CO2 injection on deep-sea meiofauna. Journal of Oceanography, 60 (4), 759-766.

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 exhaust gas containing carbon dioxide as the exhaust gas, the exhaust gas discharged from various fermentation processes in which sea water CO ₂ The objective is to present a method for melting and sequestering deep seabeds.

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 an iron and steel plant, an exhaust gas discharged from an industrial plant such as a cement plant, In the method for sequestering carbon dioxide from the exhaust gas containing carbon dioxide (CO ₂ ), such as the exhaust gas discharged from various fermentation processes,

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

Absorbing and dissolving carbon dioxide into the seawater by absorbing and dissolving carbon dioxide into the seawater by absorbing and dissolving carbon dioxide treated with seawater in which carbon dioxide is dissolved in seawater;

It is characterized by consisting of the step of sequestering carbon dioxide by discharging the seawater dissolved in the carbon dioxide to the seabed deep.

The present invention has the effect of high dissolution rate when the exhaust gas containing carbon dioxide is dissolved in deep sea water at low temperature, and the operating cost is lower than the method of compressing with a conventional compressor and absorbing it at high pressure. It is considered to be widely used for treatment.

1 is a process chart for sequestering carbon dioxide contained in exhaust gas using seawater in a deep seabed
2 is a cross-sectional view of an exhaust gas suction device
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
7 is solubility (Solubility of CO ₂ in seawater as a function of Temperature and Pressure) of CO ₂ in the water according to the pH and temperature
8 is a soluble form of the carbon dioxide in sea water _{(CO 2 (aq) -HCO 3} - -CO 3 2 -) and the concentration (salt concentration 3.5%, temperature 15 ℃, pressure 1atm)

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 A method of dissolving exhaust gas containing carbon dioxide (CO ₂ ), such as gas, in seawater and sequestering it in deep seabeds is presented.

The general process of treating the exhaust gas discharged from the current combustion process, as shown in Figure 3, the denitrification treatment, dust collection treatment, desulfurization treatment is sequentially exhausted to the chimney, in the present invention to the desulfurized exhaust gas by a de-carbon dioxide-containing CO ₂ treatment and then it proposes a way to discharge to the chimney.

First, the conditions under which carbon dioxide-containing exhaust gas can be dissolved in seawater and safely sequestered in the 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, when the exhaust gas containing carbon dioxide is supplied to the absorption process by supplying the high pressure exhaust gas compressed by the compressor and dissolved under high pressure, there is a problem in that the power cost is high. The suction device 5 sucks the exhaust gas to absorb carbon dioxide contained in the exhaust gas into the seawater while maintaining the pressure in the absorption tower at 0.2 to 0.5 MPaG.

It is preferable to use ocean deep water with the lowest temperature possible.

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 areas where low-temperature deep sea water can be easily taken in, such as on the east coast of Korea, it is desirable to treat exhaust gas containing carbon dioxide (CO ₂ ) using deep sea water.

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 hydrates on the East Coast power plants, cement plants, steel mills, petrochemical plants seabed depth deep ocean water dissolved CO ₂ treatment of exhaust gases containing carbon dioxide using deep seawater irrigation, etc. that absorb emissions (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 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)... ... ... ... ... ... ... ... (2)

In the reaction scheme (2), the hydrated water n is found to be 5-8, and CO ₂ The specific gravity of the hydrate is settled at the bottom of the sea bottom in the seawater around 1.1 which is larger than the specific gravity 1.023 (24 degreeC) of seawater.

In water with a water temperature of 10.5 ° C or higher, CO ₂ The production of hydrates is difficult.

So, by the intake of cold deep sea water absorbed by the CO ₂ absorption process in the exhaust gas, the deep sea water absorbing CO ₂ CO 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 a 6-a 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 ℃.

4. Since the solubility of carbon dioxide in water rarely dissolves at pH 4 or below, the pH of water dissolving CO ₂ should be operated at pH 5 or higher.

7 when in the water increases the concentration of CO _2, as shown in the "water in the CO ₂ Solubility (Solubility of CO ₂ in seawater as a function of Temperature and Pressure) according to the pH and temperature, by the following reaction formula (3) pH drops.

CO _{2 ^{+ H 2 O → H + +}} HCO 3 - → 2H + + CO 3 2 - ... ... ... ... ... ... ... (3)

And the pH of the "soluble form of the carbon dioxide in sea water _{(CO 2 (aq) -HCO 3} - -CO 3 2 -) and the concentration (salt concentration 3.5%, temperature 15 ℃, 1atm pressure), Fig. 8 when the aqueous solution of less than 4 As can be seen in the H ₂ CO ₃ [= CO _{2 ( aq} ] solution, CO ₂ dissolution almost does not occur, so the pH of the water should be operated to 5 or more by adjusting the injection amount of sea water.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings by using the characteristics of the carbon dioxide (CO ₂ ) and the sea water by dissolving the carbon dioxide contained in the exhaust gas in a stable manner. .

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 in a cooling plant uses a tube and shell heat exchanger type or a gas-liquid contact heat exchanger.

Ⅱ. Absorption of carbon dioxide into sea water

The exhaust gas containing carbon dioxide cooled in the cooling process and dropped to 30 ° C. or lower is absorbed and dissolved in carbon dioxide and treated with seawater in which carbon dioxide is dissolved.

The seawater is collected by the seawater intake pump (7) and fed over the upper packed bed (3) of the absorption tower (2), and sent to the packed tower circulation pump (4) above the packed bed (2) above and below the packed bed (3). When circulating, some of the circulating water is sent to the exhaust gas suction device 5 and supplied to the charging tower 2, where the exhaust gas containing carbon dioxide, which is cooled in the cooling process and dropped to 30 ° C. or lower, is sucked together and filled. It is supplied to the tower (2).

The exhaust gas containing carbon dioxide supplied to the bottom of the packed column 2 passes through the packed bed 3 while the circulating water supplied from the absorption tower circulation pump 4 and the sea water supplied from the seawater intake pump 7 are in countercurrent contact. The carbon dioxide contained in the exhaust gas is dissolved in seawater while the exhaust gas is discharged, and the exhaust gas from which carbon dioxide is removed is discharged to the upper part of the absorption tower 2 and discharged to the atmosphere through the chimney 6.

At this time, the operating pressure of the absorption tower 2 is adjusted to 0.2 to 0.5 MPa by a pressure indicating controller (PIC).

In addition, the seawater in which carbon dioxide is dissolved in the absorption tower 2 is discharged through the subsea deep discharge pipe 10 while adjusting the level of the lower portion of the absorption tower 2 with a level indicating controller (LIC).

The exhaust gas suction device 5 has a structure similar to that of an aspirator in a laboratory, as shown in FIG. 2, a cross-sectional view of the exhaust gas suction device, and absorbs the liquid into the absorption tower circulation pump 4. When a part of deep ocean water is supplied to the liquid flow path 5a of the exhaust gas suction device 5 and passes through the nozzle portion 5b, exhaust gas containing carbon dioxide is sucked by Bernoulli's theory. Together with the water, it passes through the gas-liquid mixing flow passage 5d and is supplied to the lower portion of the absorption tower 2.

The seawater intake pipe 9 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 (9), a water tank (10) is connected to the pipe by a flange, and a light bag (12) 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 (9) is installed in the form of pigtails in the Haisan or Haikou area, the gas is filled in the floor of the convex part of the pipe and 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 discharge pipe 10 is also installed to the required point in the same way as the sea water intake pipe (9).

The sea water intake method is installed in the pump chamber 8 by lowering the seawater intake pump 7 at the tip of the seawater intake pipe 9 3 to 4m lower than the sea level to facilitate priming, as shown in FIG. May be installed 3 to 4 m lower than sea level, and water may be taken in accordance with the siphon principle.

The filler material of the packed bed 3 of the absorption tower 2 is stainless steel (Porcelain), PVC (Polyvinylchloride), PE (Polyethylene), PP (Polypropylene), ABS resin ( Acrylonitrile butadiene styrene copolymer, acrylic resin, ebonite or Bakelite Fill one of the following types: Lessing Ring, Cross partition ring, Saddle type or Ball type.

In addition, the absorption tower 2 includes the exhaust gas mass velocity G supplied from the exhaust gas transfer blower 1 through the exhaust gas suction device 5 and the circulating water and sea water intake supplied to the absorption tower circulation pump 4. The mass velocity ratio (L / G) of the absorbent liquid L of the seawater supplied from the pump 7 is in the range of 0.2 to 0.6, and the top diameter is the pore point according to the type of filling of the packed bed 3. It is the principle to decide in consideration of (floating point) and loading point (Loading point), but in general, the area of the tower is good if the gas flow rate is within the range of 0.15 ~ 0.3m / second.

The height of the packed column 2 is determined in consideration of the number of transfer unit (NTU) and the height of transfer unit (HTU) in consideration of the gas moving height and the height required for the operation (about 2.5 m), but the contact time of the exhaust gas It should be in the range of 1.2 to 2 seconds, and this can be determined considering the gas movement height and the height required for the work (about 2.5m).

Ⅲ. Sequestering Carbon Dioxide in Deep Seabeds

The carbon dioxide is dissolved in the seawater is discharged to the deep seabed to sequester the carbon dioxide.

The water in which the carbon dioxide is dissolved is 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.

In the step of dissolving the carbon dioxide, water deep sea water of 10.5 ℃ or less is taken in CO ₂ hydrate (CO ₂ hydrate generated water 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 carbon dioxide of the present invention is dissolved in seawater, carbon dioxide is widely used to sequester deep seabed because it has various characteristics such as high dissolution efficiency and no need to use any chemicals, and simple facilities and low facility cost. It is expected to be.

1: exhaust gas transfer blower 2: absorption tower
3: packed bed 4: absorption tower circulation pump
5: exhaust gas suction device 5a: liquid flow path
5b: nozzle part 5c: gas flow path
5d: gas-liquid mixture flow path 6: chimney
7: Seawater intake pump 8: Pump room
9: seawater intake piping 10: deep sea drainage piping
11: Suidae 12: Unit
G / L: Ground Level LT: Level Transmitter
LIC: Level indicating controller
PT: Pressure Transmitter
PIC: Pressure indicating controller

Claims (1)

In the method for sequestering carbon dioxide from 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 is supplied to the exhaust gas suction device while being conveyed to the absorption tower packed bed by an absorption tower circulating water pump and supplied to the lower portion of the absorption tower together with the exhaust gas containing cooled carbon dioxide. When the seawater and exhaust gas come into contact with the upper part of the packed tower, the carbon dioxide contained in the exhaust gas is absorbed by the seawater, and the exhaust gas from which carbon dioxide is removed is sent to the chimney through the upper part of the absorption tower to be discharged into the atmosphere, and the carbon dioxide is absorbed and dissolved. Sea water absorbs and dissolves carbon dioxide discharged to the bottom of the absorption tower in the sea water,
A method of isolating carbon dioxide contained in the exhaust gas using sea water, characterized in that consisting of the step of isolating the carbon dioxide absorbed and dissolved in the deep sea bed through the deep sea bottom discharge pipe to isolate the carbon dioxide in the sea bed. .

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