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WO2025249453A1 - Procédé de production de dioxyde de carbone et appareil de production de dioxyde de carbone utilisé dans celui-ci - Google Patents

Procédé de production de dioxyde de carbone et appareil de production de dioxyde de carbone utilisé dans celui-ci

Info

Publication number
WO2025249453A1
WO2025249453A1 PCT/JP2025/019205 JP2025019205W WO2025249453A1 WO 2025249453 A1 WO2025249453 A1 WO 2025249453A1 JP 2025019205 W JP2025019205 W JP 2025019205W WO 2025249453 A1 WO2025249453 A1 WO 2025249453A1
Authority
WO
WIPO (PCT)
Prior art keywords
carbon dioxide
calcium carbonate
calcination furnace
furnace
bag
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2025/019205
Other languages
English (en)
Japanese (ja)
Inventor
千々松芳弘
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cims Japan Co Ltd
Original Assignee
Cims Japan Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cims Japan Co Ltd filed Critical Cims Japan Co Ltd
Publication of WO2025249453A1 publication Critical patent/WO2025249453A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

Definitions

  • the present invention relates to a carbon dioxide production method and a carbon dioxide production device used therein.
  • Another proposed technology involves recovering carbon dioxide from the atmosphere, dissolving it in water, injecting it into the ground, allowing it to be absorbed and fixed in the ground, and then recovering the hot spring water (see, for example, Patent Document 1).
  • carbon dioxide is captured from exhaust gas outlets or from the atmosphere, it is mineralized and fixed underground. In both cases, it is thought that calcium oxide contained in the basalt that makes up the Earth's crust reacts with carbon dioxide to form calcium carbonate, which is fixed underground.
  • carbon dioxide is far removed from the mechanisms for carbon dioxide reduction and capture that are originally performed by the natural environment, and therefore creates other issues, raising concerns that it will take time to improve the marine environment, which has been degraded by increased atmospheric carbon dioxide.
  • the present invention was made in consideration of these circumstances, and aims to provide a carbon dioxide production device and a method for producing the same that can easily reduce greenhouse gases such as carbon dioxide, provide carbon dioxide at low cost, and improve the marine environment.
  • the carbon dioxide production device of the present invention which solves the above problems, is a device for producing carbon dioxide from calcium carbonate, and includes a calcination furnace configured so that a lid can seal the calcium carbonate inlet of the furnace body, and a surge tank connected to the calcination furnace.
  • the calcination furnace is configured to be able to seal a predetermined amount of calcium carbonate and is configured to heat the predetermined amount of calcium carbonate in the calcination furnace to a temperature at which it decomposes into calcium oxide and carbon dioxide.
  • the surge tank is sized to be able to recover the amount of carbon dioxide calculated from the predetermined amount of calcium carbonate charged into the calcination furnace, so as to recover the carbon dioxide obtained when the calcium carbonate in the calcination furnace is heated and decomposed into calcium oxide and carbon dioxide.
  • the calciner may be designed to be heated using a normal power source or waste heat from an incinerator, etc.
  • the calcination furnace may be configured to be heated using renewable energy.
  • the surge tank may be constructed from a sheet-like bag whose capacity can be increased or decreased.
  • the bag body is attached to a pair of frames, and the frames are controllable from a close state to a separated state and from a separated state to a close state, and the capacity of the bag body may be increased when the frames are controlled from a close state to a separated state, and decreased when the frames are controlled from a separated state to a close state.
  • the bag may be housed in a rigid container large enough to house the bag, and the pressure inside the container may be reduced or increased by a pump, so that reducing the pressure inside the container increases the volume of the bag, and increasing the pressure inside the container decreases the volume of the bag.
  • the carbon dioxide production apparatus may have a cooling passage between the calcination furnace and the surge tank.
  • the carbon dioxide production method of the present invention which solves the above problems, involves sealing a predetermined amount of calcium carbonate in a sealable calcination furnace, heating it in the furnace to decompose it into calcium oxide and carbon dioxide, and recovering the resulting carbon dioxide in a surge tank large enough to recover the amount of carbon dioxide calculated to be generated from the predetermined amount of calcium carbonate.
  • the above carbon dioxide production method may also use seashells as calcium carbonate.
  • the shells may be irradiated with ultraviolet light or sun-dried.
  • the calcium carbonate may be obtained by exposing calcium oxide obtained by the above-mentioned method for producing carbon dioxide to the atmosphere, causing the calcium oxide to absorb carbon dioxide in the atmosphere and return to calcium carbonate.
  • the above carbon dioxide production method may also involve producing limewater from the obtained calcium oxide and supplying it to the sea.
  • the above-mentioned carbon dioxide production method may also involve scattering the resulting calcium oxide on a sandy beach landward of the high tide shoreline.
  • the carbonated water of the present invention which solves the above problems, is obtained by dissolving carbon dioxide obtained by the above carbon dioxide production method in water.
  • the lid is configured to seal the calcium carbonate inlet of the furnace body. Therefore, when the calcination furnace containing charged calcium carbonate is heated, the carbon dioxide generated from the calcium carbonate is collected in a surge tank connected to the calcination furnace.
  • the surge tank is sized to collect the amount of carbon dioxide calculated from the amount of calcium carbonate charged into the calcination furnace, so that the carbon dioxide generated when calcium carbonate is heated in the calcination furnace and decomposed into calcium oxide and carbon dioxide can be collected. Therefore, the carbon dioxide decomposed from calcium carbonate can be collected in the surge tank. Furthermore, heating calcium carbonate in this way produces calcium oxide along with carbon dioxide.
  • this calcium oxide absorbs carbon dioxide and returns to calcium carbonate. This process allows the carbon dioxide from the atmosphere to be captured. Furthermore, the converted calcium carbonate can be reused to produce carbon dioxide, so carbon dioxide can be produced while capturing carbon dioxide from the atmosphere.
  • 1 is a schematic diagram showing an outline of the overall configuration of a carbon dioxide production apparatus according to the present invention.
  • 1(a) and 1(b) are horizontal and vertical cross-sectional views showing a calciner of a carbon dioxide production apparatus according to the present invention.
  • 1(a) and 1(b) are cross-sectional views showing an example of a surge tank of a carbon dioxide production apparatus according to the present invention before and after filling.
  • 10(a) and 10(b) are cross-sectional views showing another example of the surge tank of the carbon dioxide generating apparatus according to the present invention before and after filling.
  • Fig. 1 shows an outline of the overall configuration of a carbon dioxide production apparatus 1 according to the present invention
  • Fig. 2 shows a calcination furnace 2 of the carbon dioxide production apparatus 1
  • Figs. 3 and 4 show a surge tank 3 of the carbon dioxide production apparatus 1. That is, the carbon dioxide production apparatus 1 is equipped with the calcination furnace 2 and the surge tank 3, and is capable of producing carbon dioxide CO2 from calcium carbonate CaCO3 .
  • the kiln 2 has a furnace body 21 with a generally U-shaped horizontal and vertical cross section, one side of which forms an inlet 21a, and a lid 22 that fits over the inlet 21a, allowing the lid 22 to seal against the inlet 21a of the furnace body 21.
  • the lid 22 consists of a lid portion 22a that fits over the inlet 21a of the furnace body 21 and a cart-shaped container portion 22b into which calcium carbonate can be added. When the container portion 22b is slid into the furnace body 21, the lid portion 22a of the lid 22 can seal against the inlet 21a of the furnace body 21.
  • This sealing is achieved by operating the handle 23 to close the lid portion 22a of the lid 22 via the hinge 24, and then closing the sealing fitting 25 between the inlet 21a of the furnace body 21 and the lid portion 22a of the lid 22, thereby maintaining an airtight state within the kiln 2.
  • the capacity of the calcination furnace 2 is set so that it can store a predetermined amount of calcium carbonate.
  • the amount of calcium carbonate stored can be, for example, 50 kg, 100 kg, or even 1 ton.
  • the amount of carbon dioxide generated also increases accordingly, so an amount of around 100 kg is preferable.
  • the firing furnace 2 is sealed and can heat the sealed space up to approximately 850°C by a heating element 26 in the furnace body 21 provided in the sealed space.
  • the interior of the sealed space is constructed of a ceramic heat insulating material C, and the outside is constructed of a rigid case F with an air insulation layer A in between.
  • the furnace body 21 of the firing furnace 2 is provided with an exhaust path 27 that passes from the heat insulating material C through the air insulation layer A to the rigid case F.
  • the heating element 26 is not limited to any particular type as long as it can heat the interior of the firing furnace 2 to 850°C, and heating elements 26 used for resistance heating, arc heating, induction heating, dielectric heating, infrared heating, microwave heating, arc plasma heating, etc. can be used.
  • the structure of the firing furnace 2 is a side-opening type, it is not limited to a side-opening type, and may be a top-opening type, and various configurations can be adopted as long as the structure can keep the inside of the furnace body 21 sealed.
  • the surge tank 3 is connected to an exhaust path 27 provided in the incinerator 2, thereby connecting to the sealed interior of the incinerator 2.
  • the surge tank 3 is sized to recover the amount of carbon dioxide calculated from a given amount of calcium carbonate stored in the incinerator 2 when the given amount of calcium carbonate decomposes into calcium oxide and carbon dioxide. For example, approximately 100 g of calcium carbonate decomposes into approximately 56 g of calcium oxide and approximately 44 g of carbon dioxide. Since approximately 44 g of carbon dioxide is equivalent to approximately 22.4 liters per mole, if the incinerator 2 can store 100 kg of calcium carbonate, the surge tank 3 must be sized to recover 22.4 liters x 1,000, or 22,400 liters of carbon dioxide.
  • the surge tank 3 must be sized to recover a sufficient amount of carbon dioxide, such as 25,000 liters or 30,000 liters.
  • the size of the surge tank 3 is merely an example, and is calculated from a predetermined amount of calcium carbonate to be used depending on the size of the calcination furnace 2.
  • the surge tank 3 may be configured as a sheet-like bag 30 for collecting gas.
  • the bag body 30 is formed in the shape of a cube or rectangular parallelepiped, with the bottom surface 30a fixed to the base portion 31a of a frame 31 that is framed so as to surround the bag body 30, and the top surface 30b fixed to a lattice-shaped frame body frame 32 that matches the top surface 30b.
  • This frame body frame 32 is configured to be suspended by a wire 35 from a motor 33 provided on the side of the base portion 31a of the frame 31 via a pulley 34 attached to the top of the frame 31, and by winding this wire 35 by driving the motor 32,
  • the frame 32 can be raised relative to the base 31a of the frame 31, and when winding by the motor 33 is stopped and the torque is released, the frame 32 and the bag 30 can descend under their own weight.
  • the frame 32 can be raised and lowered relative to the base 31a of the frame 31, and accordingly, the bottom surface 30a of the bag 30 fixed to the base 31a of the frame 31 and the top surface 30b of the bag 30 fixed to the frame frame 32 can be brought into a close and separated state.
  • the space between the bottom surface 30a and the top surface 30b of the bag 30 is formed in a bellows shape at a constant interval in the height direction, and when the close state is reached, the capacity of the bag 30 decreases, and when the separated state is reached, the capacity of the bag 30 increases. Therefore, in cases where a large amount of carbon dioxide is generated in the kiln 2 and needs to be quickly exhausted through the exhaust path 27 to the bag 30, or where carbon dioxide generated in the kiln 2 cannot be exhausted unless it is guided through the exhaust path 27 to the bag 30, the frame frame 32 can be separated from the base frame 31 to increase the capacity of the bag 30, creating a negative pressure inside the bag 30 and allowing the carbon dioxide generated in the kiln 2 to be guided and collected into the bag 30.
  • the location of the gas inlet/outlet 30c for storing or venting carbon dioxide inside the bag 30 is not particularly limited, as long as it is located in a position that allows carbon dioxide to smoothly enter and exit through the inlet/outlet 30c without interfering with the increase or decrease in the capacity of the bag 30. It can be located near the periphery of the bottom surface 30a, on the top surface 30b, or on a side surface. It is most preferable to locate it in the center of the bottom surface 30a.
  • the bag body 30 may be formed in a spherical shape and stored in a rigid container 36 configured to accommodate the bag body 30. This storage is achieved by inserting the bag body 30 through an opening 36a provided at the bottom of the rigid container 36. The gas inlet/outlet 30c of the bag body 30 is also aligned with this opening 36a, and when the bag body 30 is stored in the rigid container 36, the opening 36a of the rigid container 36 is closed by the inlet/outlet 30c of the bag body 30, forming a closed space s between the bag body 30 and the storage container 36.
  • an intake/exhaust pipe 36b is provided at the top of the rigid container 36, communicating with the closed space s.
  • the bag 30 expands within the rigid container 36, increasing the volume of the bag 30; when the closed space s is pressurized, the volume of the bag 30 within the rigid container 36 decreases. Therefore, in cases where a large amount of carbon dioxide is generated in the firing furnace 2 and it is necessary to quickly exhaust it through the exhaust path 27 to the bag 30, or in cases where carbon dioxide generated in the firing furnace 2 cannot be exhausted unless it is guided through the exhaust path 27 to the bag 30, the pump 37 can be driven to expand the bag 30 within the rigid container 36, increasing the volume of the bag 30. This creates a negative pressure inside the bag 30, allowing the carbon dioxide generated in the firing furnace 2 to be guided into the bag 30 and recovered.
  • the inlet/outlet 30c of the bag body 30 is connected to the exhaust path 27 of the kiln 2. Because the high-temperature carbon dioxide generated in the kiln 2 passes through the exhaust path 27, it is preferably constructed of a heat-resistant pipe. Furthermore, it is preferable that the exhaust path 27 be constructed of a metal pipe, such as a copper pipe, which has a high cooling effect, so that the carbon dioxide generated in the kiln 2 is cooled when it is collected in the surge tank 3. In this case, the exhaust path 27 may be cooled by heat exchange, such as air cooling or water cooling.
  • the inlet/outlet 30c of the bag body 30 may be extended in a tubular form near the connection point with the bag body 30 to connect to the metal pipe exhaust path 27.
  • the metal pipe exhaust path 27 may be extended to a heat-resistant and flexible exhaust path 27 such as a silicone tube, and connected to the inlet/outlet 30c of the bag body 30 via the silicone tube exhaust path 27.
  • the surge tank 3 is left in a state where the bag body 30 is as lightly packed as possible and empty.
  • heating begins using the heating element 26 of the calcination furnace 2, raising the temperature to approximately 850°C to decompose the calcium carbonate into calcium oxide and carbon dioxide.
  • the pressure inside the calcination furnace 2 increases, but there is a pressure loss when passing through the exhaust path 27, and there is a concern that this will not flow smoothly to the surge tank 3.
  • the surge tank 3 is controlled to generate negative pressure inside the bag 30, increasing its capacity. As a result, the carbon dioxide generated in the calcination furnace 2 is collected within the bag 30 of the surge tank 3.
  • the calcium carbonate to be calcined may be limestone or shells. In either case, if the calcium carbonate contains moisture, the surge tank 3 will require additional capacity due to the water vapor, so it must be thoroughly dried before use.
  • a second exhaust path 29 may be provided in the calcination furnace 2, and this second exhaust path 29 may be left open to allow the water vapor to escape until the temperature exceeds 100°C, at which point the water vapor evaporates.
  • shells when shells are used, they contain organic components such as proteins, so it is preferable to remove these before use. The removal method involves sun-drying the shells, which expose them to ultraviolet light to decompose and remove the organic components.
  • the second exhaust path 29 may be left open until the decomposition temperature of the organic components is reached, allowing the decomposition gases generated during decomposition to escape.
  • the decomposition gas of the organic components is exhausted through the second exhaust path 29 and then the second exhaust path 29 is closed, carbonized carbon remains in the calcination furnace 2. In this case, the remaining carbon will cause the generation of carbon monoxide in addition to carbon dioxide. Therefore, it is preferable to provide a carbon monoxide adsorbent in the exhaust path 27, the inlet/outlet 30c of the bag 30, or inside the bag 30.
  • the aforementioned water vapor and carbon monoxide may also be collected in the surge tank 3, and then the carbon dioxide may be separated and collected.
  • the surge tank 3 should be sized taking into account the amount of water vapor and carbon monoxide generated.
  • the water vapor contained is limited to the amount generated from moisture at the saturated water vapor amount at the current temperature.
  • the water contained in the form of water of crystallization cannot be removed at 100°C, the boiling point of water, and must be heated to near the decomposition temperature of calcium carbonate.
  • the amount of water contained in the shells or limestone should be less than 5% of the raw material, and is usually around 2-3%. Strictly speaking, because the molecular weights of water vapor and carbon monoxide are smaller than that of carbon dioxide, the amount of gas generated from the same amount of raw material will be greater for water vapor and carbon monoxide than for carbon dioxide.
  • the surge tank 3 is sized to have a capacity that is at least 10% larger than the amount of carbon dioxide calculated assuming that shells and limestone are 100% calcium carbonate, it will be possible to recover other gases, such as carbon monoxide and water vapor, even if they are generated. Furthermore, carbon monoxide can be converted to carbon dioxide using a catalyst during firing in the firing furnace 2 or when passing through the exhaust path 27, and water vapor can be condensed by cooling in the exhaust path 27, so this can also be addressed. Furthermore, when recovering carbon dioxide from calcium carbonate made from shells or limestone, only carbon dioxide, carbon monoxide, and water vapor are generated, so a bag 30 of the surge tank 3 can be made of a material with a certain degree of flexibility.
  • a surge tank 3 configured with a bag 30 housed within a rigid container 36 can ensure greater safety.
  • the exhaust path 27 or bag 30 may also be provided with a safety valve 28 that opens when internal pressure rises.
  • the carbon dioxide can be used directly from the surge tank 3, or it can be refilled into a cylinder and used again. For example, when 100 kg of calcium carbonate is processed, 44 kg of carbon dioxide is obtained. If this is used to produce carbonated water, 8,800 bottles of carbonated water can be produced using 5 g of carbon dioxide per 500 ml bottle.
  • the carbon dioxide recovered in the surge tank 3 also contains air equivalent to the volume of the calcination furnace 2. Therefore, in order to increase the concentration of carbon dioxide obtained, the calcination furnace 2 may be equipped with a vacuum pump 20 on the second exhaust path 29, allowing the interior of the calcination furnace 2 to be depressurized. In this case, air from inside the calcination furnace 2 is prevented from being mixed into the surge tank 3, thereby obtaining carbon dioxide of a higher concentration, and the reduced pressure allows the temperature at which calcium carbonate is decomposed to be set lower.
  • Calcium oxide can also be made into limewater and supplied to the ocean.
  • atmospheric carbon dioxide concentrations are rising, leading to concerns about global warming.
  • the ocean absorbs the most carbon dioxide on Earth, resulting in ocean acidification, making it difficult for shellfish to grow and causing the disappearance of coral reefs.
  • limewater By continuously supplying limewater to the ocean, it can act as a buffer against the increased hydrogen ion concentration caused by acidification, preventing further acidification. It can also continuously supply the ocean with calcium ions, which are necessary for the growth of marine exoskeletal organisms such as shellfish and coral. Because limewater can buffer the increased hydrogen ion concentration caused by the ocean absorbing two moles of carbon dioxide, it has the same effect as recovering two moles of carbon dioxide.
  • calcium carbonate can also be spread on sandy beaches landward of the high-tide shoreline or used as plaster. In this case, after absorbing carbon dioxide from the atmosphere and returning to calcium carbonate, the calcium carbonate absorbs more carbon dioxide when struck by rainwater containing carbon dioxide, absorbing two moles of carbon dioxide from the atmosphere and becoming liquid calcium bicarbonate, which then seeps into the ground and flows into the sea, or flows into the sea via rivers and drainage channels.
  • the carbon dioxide production device 1 of the present invention can produce 1 mole of carbon dioxide from the raw material calcium carbonate, and recover 2 moles of carbon dioxide from the resulting calcium oxide.
  • 1 mole is carbon dioxide that was fixed in the base calcium carbonate, so essentially 2 moles of carbon dioxide can be recovered.
  • the carbon dioxide recovery business will be viable. This can be fully achieved even when all power for the carbon dioxide production apparatus 1, including the calcination furnace 2 and surge tank 3 controlled by the control unit 4, is generated solely from thermal power generation. When solar power generation is used, the majority of the carbon dioxide can be recovered.
  • the furnace body 21 of the calcination furnace 2 may be configured to be attached to a waste heat generating section so that calcium carbonate can be directly thermally decomposed using waste heat without using electricity from a thermal power plant.
  • waste heat from municipal waste incinerators or any other source that generates waste heat sufficient to heat calcium carbonate to 850°C, at which it can be thermally decomposed can also be used.

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  • Treating Waste Gases (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

La présente invention concerne un appareil de production de dioxyde de carbone qui permet de réduire facilement le gaz à effet de serre tel que le dioxyde de carbone, de fournir du dioxyde de carbone à faible prix, et de préserver l'environnement marin, ainsi qu'un procédé de production de dioxyde de carbone. Un appareil de production de dioxyde de carbone 1 pour produire du dioxyde de carbone à partir de carbonate de calcium comprend : un four de calcination 2 qui est conçu de telle sorte qu'un couvercle peut sceller hermétiquement un orifice de charge de carbonate de calcium du corps de four ; et un réservoir de surpression 3 qui est relié au four de calcination 2. Le four de calcination 2 est conçu pour pouvoir sceller hermétiquement une quantité prescrite de carbonate de calcium, et est conçu pour être chauffé à une température à laquelle la quantité prescrite de carbonate de calcium dans le four de calcination 2 est décomposée en oxyde de calcium et dioxyde de carbone. Le réservoir tampon 3 est formé dans la taille qui permet la récupération d'une quantité de dioxyde de carbone généré qui est calculée sur la base de la quantité prescrite de carbonate de calcium chargée dans le four de calcination 2, de telle sorte que le dioxyde de carbone obtenu lorsque le carbonate de calcium dans le four de calcination 2 est chauffé pour se décomposer en oxyde de calcium et le dioxyde de carbone est récupéré.
PCT/JP2025/019205 2024-05-30 2025-05-28 Procédé de production de dioxyde de carbone et appareil de production de dioxyde de carbone utilisé dans celui-ci Pending WO2025249453A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024-097748 2024-05-30
JP2024097748 2024-05-30

Publications (1)

Publication Number Publication Date
WO2025249453A1 true WO2025249453A1 (fr) 2025-12-04

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ID=97870578

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2025/019205 Pending WO2025249453A1 (fr) 2024-05-30 2025-05-28 Procédé de production de dioxyde de carbone et appareil de production de dioxyde de carbone utilisé dans celui-ci

Country Status (1)

Country Link
WO (1) WO2025249453A1 (fr)

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