Carbon dioxide recovery apparatus and method

Abstract

To provide a carbon dioxide recovery apparatus capable of recovering carbon dioxide in liquids at low cost, and a method of recovering carbon dioxide.SOLUTION: A carbon dioxide recovery apparatus includes a partition separating the atmosphere from the interior space, a storage part for storing a liquid in which carbon dioxide is dissolved in the interior space, a vibration transmission part transmitting vibrations of a vibration source located in close proximity to the storage part or in the storage part, to the liquid stored in the storage part, and an accumulation part for collecting and storing the carbon dioxide released from the liquid by the vibrations transmitted through the vibration transmission part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a carbon dioxide recovery device and a carbon dioxide recovery method for recovering carbon dioxide from a liquid at low cost. [Background technology]

[0002] There is a worldwide demand for reducing the burden on the global environment by reducing the amount of carbon dioxide in the atmosphere as a measure against global warming. To achieve this, it is necessary to reduce carbon dioxide emissions and, at the same time, to reduce the concentration of carbon dioxide in the atmosphere by capturing carbon dioxide that is in the atmosphere. The concentration of carbon dioxide in the atmosphere is low at about 400 ppm, so in order to reduce the concentration of carbon dioxide in the atmosphere, it is necessary to find a method that minimizes the release of new carbon dioxide as energy for capture.

[0003] One method of capturing carbon dioxide without releasing new carbon dioxide is to capture it through seawater or freshwater, which contains dissolved carbon dioxide from the atmosphere, and a method of extracting carbon dioxide from the aforementioned seawater or freshwater by reducing pressure is known.

[0004] Patent Document 1 describes a carbon dioxide removal device for a fish tank that removes carbon dioxide dissolved in seawater in the fish tank by reducing the pressure of the seawater. Specifically, it discloses that in order to remove carbon dioxide from the seawater, carbon dioxide bubbles are discharged to the outside in a reduced pressure space, and seawater from which carbon dioxide has been removed is supplied to the tank. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2003-259759 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the device described in Patent Document 1 requires a nozzle and a control unit for maintaining a reduced pressure state inside the tank, which results in a complex device configuration and high costs.

[0007] An object of the present invention is to provide a carbon dioxide recovery device and a carbon dioxide recovery method that recover carbon dioxide in a liquid at low cost. [Means for solving the problem]

[0008] In order to solve the above problems, a carbon dioxide capture device in one aspect of the present invention is provided comprising: a partition wall separating the atmosphere from an internal space; a storage section for storing a liquid in which carbon dioxide is dissolved in the internal space; and a vibration transmission section for transmitting vibrations from a vibration source disposed in the storage section or adjacent to the storage section to the liquid stored in the storage section; and a storage unit that collects and stores the carbon dioxide released from the liquid due to the vibrations transmitted via the vibration transmission unit. Effect of the Invention

[0009] According to the present invention, carbon dioxide contained in a liquid can be recovered at low cost. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic diagram of a carbon dioxide capture device according to a first embodiment of the present invention. [Diagram 2] FIG. 5 is a schematic diagram of a carbon dioxide capture device according to a second embodiment of the present invention. [Diagram 3] FIG. 11 is a schematic diagram of a carbon dioxide capture device according to a third embodiment of the present invention. [Figure 4] FIG. 11 is a schematic diagram of a carbon dioxide capture device according to a fourth embodiment of the present invention. [Diagram 5] FIG. 11 is a schematic diagram of a carbon dioxide capture device according to a fifth embodiment of the present invention. [Figure 6]FIG. 13 is a schematic diagram of a carbon dioxide capture device according to a sixth embodiment of the present invention. [Figure 7] FIG. 13 is a schematic diagram of a carbon dioxide capture device according to a seventh embodiment of the present invention. [Figure 8] FIG. 13 is a schematic diagram of a carbon dioxide capture device according to an eighth embodiment of the present invention. [Figure 9] FIG. 13 is a schematic diagram of a carbon dioxide capture device according to a ninth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A carbon dioxide capture device according to one embodiment of the present invention captures carbon dioxide from the atmosphere at low cost by heating or reducing pressure from a liquid in which carbon dioxide is dissolved. Examples of the liquid in which carbon dioxide is dissolved include rainwater, river water, lake water, seawater, and the like. Here, in fresh water such as rainwater and river water, carbon dioxide from the atmosphere is dissolved at an equilibrium pressure. In comparison, seawater has an even higher solubility of carbon dioxide. Also, the solubility of carbon dioxide in water is high at low temperatures and low at high temperatures. Additionally, the higher the air pressure, the higher the solubility of carbon dioxide, and the lower the air pressure, the lower the solubility.

[0012] In order to reduce the amount of carbon dioxide in the atmosphere as a measure against global warming, it is necessary to extract carbon dioxide while feeding and discharging large amounts of seawater or freshwater into the device. In order to capture carbon dioxide from seawater or freshwater using low energy, it is desirable to extract carbon dioxide by depressurizing the seawater or freshwater.

[0013] The carbon dioxide capture device according to the present invention can capture carbon dioxide at low cost with a simple device configuration. Specifically, seawater or fresh water is pumped, carbon dioxide released from the storage unit is captured, and the seawater or fresh water is circulated within the device using the principle of a siphon. Here, for example, the storage unit is a Torricelli vacuum (a vacuum space formed at the top as water is pumped), and the Torricelli vacuum refers to a vacuum space generated in a space that exceeds the height that is the positional limit at which water can be pumped by reducing pressure. It is generally known that a Torricelli vacuum is formed due to the relationship between atmospheric pressure, the specific gravity of the solution, and the vapor pressure of the solution, and when water exceeds about 10 m above sea level, a Torricelli vacuum occurs. On the other hand, reducing pressure in the storage unit is not essential, and the device may be configured so that carbon dioxide is released by heating with a heating mechanism.

[0014] In one embodiment of the carbon dioxide capture device of the present invention, the carbon dioxide dissolved in seawater or freshwater is released as a gas in response to the Torricelli vacuum, so that the carbon dioxide can be discharged by a vacuum pump and captured in a capture tank. The carbon dioxide capture device of the present invention also utilizes, for example, the siphon principle to circulate the pumped seawater or freshwater within the device under reduced pressure. Note that the method of circulation within the device is not limited to the siphon principle, and may be configured using other known techniques as long as it is a mechanism for circulating liquid.

[0015] In the carbon dioxide capture device of the present invention, the pressure density due to the weight of the liquid in the water supply channel and the pressure density of the liquid in the drainage channel are the same if the positional heights of the water supply channel and the drainage channel are the same. In other words, if the water level of the water supply surface is higher than the water level of the drainage surface, the liquid can be caused to flow from the water supply side to the drainage side by potential energy without power assistance such as a water flow pump. Even if the water supply surface and the drainage surface are at the same height, the liquid can be circulated within the device by providing a small amount of power assistance from a water flow pump.

[0016] The carbon dioxide capture device of the present invention employs the above-mentioned configuration and method, thereby enabling the carbon dioxide capture device to capture carbon dioxide with low energy. Furthermore, the present invention further enables the capture of carbon dioxide from a liquid at low cost by transmitting vibrations to the liquid, i.e., by vibrating the liquid, as a means for shortening the reaction time for extracting carbon dioxide dissolved in the liquid as a gas. Furthermore, it is preferable to employ a method of vibrating the liquid by transmitting vibrations generated by a device that is a vibration source and is not intended to generate vibrations.

[0017] That is, the carbon dioxide capture device of the present invention is composed of a partition wall that separates the atmosphere from the internal space, and has a storage section that stores a liquid in which carbon dioxide is dissolved in the internal space.The device also has a vibration transmission section that transmits vibrations from the storage section or a vibration source disposed in the vicinity of the storage section to the liquid stored in the storage section.The device is further characterized by having a storage section that recovers and accumulates the carbon dioxide released from the liquid by the vibrations transmitted via the vibration transmission section, thereby recovering carbon dioxide at low cost.

[0018] The present invention will be described in detail below with reference to preferred embodiments. Note that the present invention is not limited to the following embodiments, and the scope of the present invention includes any appropriate modifications and improvements to the following embodiments based on the ordinary knowledge of those skilled in the art, provided that the modifications and improvements do not deviate from the spirit of the present invention.

[0019] [First embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0020] Liquid 100 in which carbon dioxide from the atmosphere is dissolved is injected into a CO2 release tank (storage unit) 101 via an injection valve 105 by an injection pump 104. A drain valve 107 is closed, and a space 111 is generated in the liquid 100 inside the CO2 release tank (storage unit) 101 by adjusting the amount of liquid injected. After the injection is completed, the injection valve 105 is closed.

[0021] Next, the valve 106 is opened, and the inside of the CO2 release tank (storage section) 101 is depressurized by the vacuum pump 102. In this embodiment, the degree of vacuum inside the CO2 release tank (storage section) 101 is set to 2 kPa, but the pressure may be higher than this as long as it is equal to or lower than atmospheric pressure, and the degree of vacuum is not limited.

[0022] Here, the vacuum pump 102 is physically connected to a CO2 release tank (storage section) 101 via a vibration transmission section 103. The vibration generated by the exhaust operation of the vacuum pump 102, which is a vibration source, is transmitted to the liquid inside the storage section by the vibration transmission section 103. Specifically, the vibration is transmitted to the liquid 100 inside the CO2 release tank (storage section) 101 via the CO2 release tank (storage section) 101. That is, the vibration of a vibration source arranged close to the storage section 101 is transmitted to the liquid stored in the storage section 101 via the vibration transmission section 103.

[0023] Here, the liquid 100 is in a state where excess carbon dioxide is dissolved therein compared to the pressure equilibrium due to the reduced pressure, and carbon dioxide is released from the liquid 100 to the storage section 101. Furthermore, due to vibrations generated by the vacuum pump 102, carbon dioxide is released from the liquid 100 as bubbles 110 into the space 111. The carbon dioxide released into the space 111 is collected from the release tank 101 by the vacuum pump 102 and stored in the CO2 storage section (accumulation section) 108.

[0024] In this embodiment, the depressurization time for liquid 100 is set to 3 minutes, but the depressurization time is not limited thereto, and by lengthening the depressurization time, the recovery rate of carbon dioxide from liquid 100 by the carbon dioxide recovery device is improved. However, by lengthening the depressurization time, the amount of carbon dioxide remaining in liquid 100 decreases, and therefore the amount of carbon dioxide that can be recovered per hour decreases.

[0025] In this embodiment, after the liquid 100 has been depressurized for a desired depressurization time, the valve 106 is closed and the vacuum pump 102 is stopped. The atmospheric leak valve 122 is opened to bring the space 111 to atmospheric pressure, and the drain valve 107 is opened to drain the liquid 100 inside the CO2 release tank (storage section) 101. After the liquid 100 inside the CO2 release tank (storage section) 101 has been drained, the drain valve 107 is closed, completing a series of carbon dioxide recovery operations. The series of operations described above is repeated to recover carbon dioxide from the atmosphere.

[0026] In this embodiment, seawater is used as the liquid 100 in which carbon dioxide is dissolved, but the liquid is not limited to seawater as long as it is a liquid in which atmospheric carbon dioxide is dissolved, and rainwater, river water, lake water, or tap water may also be used.

[0027] Liquid 100 may be a basic aqueous solution or a fluorine-based active liquid, and carbon dioxide in the atmosphere may be captured by exposing these liquids to the atmosphere. It is also possible to use the CO2 in the captured liquid as a circulating system in which the liquid 100 after carbon dioxide capture is used again to capture carbon dioxide in the atmosphere.

[0028] The liquid 100 may be a basic solution for recovering CO2. Examples of basic substances include sodium hydroxide, ammonia, and amines (primary amines, secondary amines, and tertiary amines), and may be used as is or in solution. A solution of a salt such as sodium bicarbonate that is dissolved and shows basicity may also be used. In order to suppress a sudden change in pH accompanying the recovery of CO2, borate, phosphate buffer, or Tris may be used as a buffer. Recovery efficiency is improved by using a fluorine-based active liquid with high CO2 solubility. In addition, the fluorine-based active liquid with high CO2 solubility is characterized in that it is selected from fluorocarbons that may have a substituent from the viewpoint of viscosity and may have a branched structure and / or a cyclic structure. For example, perflubron, perfluorodecalin, Fluorinert FC-3283, perfluorobutyl perfluorotetrahydrofuran, perfluoro-1-isopropoxyhexane, perfluoro-1,4-diisopropoxybutane, and hydrofluoroether (Novec 7100, Novec 7300) are listed, but the scope of the present invention is not limited thereto. It is also useful to mix other liquids to adjust the physical properties of the liquid.

[0029] The vacuum pump 102 used in this embodiment is a vacuum pump driven by an induction motor that operates on a single-phase 100V, 50Hz commercial power source. When the vibration of the vacuum pump, which is the vibration source, was measured, large vibrations were obtained at several Hz or more, and peaks of vibration amplitude were observed around 25 Hz and around 50 Hz.

[0030] It is preferable to use a power-saving brushless motor, and the general control frequency is in the range of several kHz to 10 kHz. The drive current of a brushless motor is generated by amplifying the digital waveform caused by the PWM signal generated by the drive frequency mentioned above using a power transistor or FET, and converting it into an analog current waveform using a low-pass filter. Depending on the drive circuit configuration, high frequencies that cannot be completely removed by the low-pass filter mentioned above remain in the drive current waveform, which affects the vibration generated by the motor. For this reason, the pump's vibration frequency range is set to the aforementioned rotation speed and structure, and large vibrations can be obtained in the range of several Hz to 10 kHz, taking into account the control frequency.

[0031] A typical brushless motor has a maximum rotation speed of 6000 rpm, and at this rotation speed, the rotation frequency of the motor itself is 100 Hz or less. Vibrations can also be generated by controlling the motor's rotation speed to cause unevenness, for example by controlling the motor drive current so that the vibration caused by cogging of the brushless motor increases. For example, in the case of a motor driven by a three-phase current, the product is often made up of about five sets of three-phase coils, and vibrations due to cogging occur about 15 times per motor rotation. Brushless motors come in a wide variety of configurations, so the coil configuration described above is just one example.

[0032] In addition, the vibration frequency generated varies depending on the structure of the gears and screws that make up the pump. For example, a part of the pump structure may be configured to have a gear that rotates at high speed, generating high-frequency vibration. It is generally known that vibration energy increases with increasing frequency for the same amplitude, and there is no limitation on the vibration frequency as long as it can promote the generation of bubbles 110 from the liquid 100.

[0033] In this embodiment, the vibration transmission unit 103 uses a metal member made of iron. The vacuum pump 102, which is the vibration source, and the CO2 release tank (storage unit) 101 are fixed by the above-mentioned metal member. The vibration transmission unit 103 is not limited to the above-mentioned metal member made of iron as long as it transmits the vibration of the vacuum pump 102, which is the vibration source, to the liquid 100, and may be, for example, SUS, an alloy of aluminum or copper, or a resin material. The vibration transmission unit 103 may also be an exhaust pipe for reducing the pressure inside the CO2 release tank (storage unit) 101, and the device stand 124 may be used as the vibration transmission unit 103 by installing the vacuum pump 102 on the device stand 124.

[0034] The CO2 release tank (storage unit) 101 is supported on a mounting unit such as an apparatus stand 124 via an elastic unit 123, and the CO2 release tank (storage unit) 101 is structured to be easily vibrated. In this embodiment, a rubber member is used for the elastic unit 123, but it may be a structure made of metal, resin, or wood having spring properties, or a damper structure. The mounting unit is not limited to the stand, and may be the ground, etc.

[0035] In the carbon dioxide recovery device, the liquid 100 in the storage unit 101 may be heated by a heating unit 109 composed of a heating mechanism. The heating unit 109 is preferably a heat source that does not release new carbon dioxide into the atmosphere for heating, and is preferably one that uses, for example, factory waste heat, solar energy, geothermal energy, or green electricity. The solution 100 in which carbon dioxide is in atmospheric pressure equilibrium releases carbon dioxide not only by reducing the pressure but also by increasing the solution temperature, so it is desirable to heat the solution as well as reducing the pressure.

[0036] [Second embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0037] The following mainly describes the differences from the first embodiment. In this embodiment, the liquid 100 in which carbon dioxide is dissolved is seawater, and the CO2 release tank (storage unit) 101 is installed so that the pumping height H2 of the liquid 100 inside the CO2 release tank (storage unit) 101 is about 10 m above the seawater level H2. The liquid 100 is pumped by a pumping pump 104 through a water supply pipe 113 into the CO2 release tank (storage unit) 101 in the direction shown by the arrow.

[0038] At the same time, the pressure inside the CO2 release tank (storage portion) 101 is reduced by the vacuum pump 102. The liquid 100 pumped from the water supply port is stored inside the CO2 release tank (storage portion) 101 in an amount based on the shape of the CO2 release tank (storage portion) 101 and the pumping height H2.

[0039] In the carbon dioxide capture device of this embodiment, the pumped liquid 100 is drained from the drain outlet 118 as a flow shown by the arrow by the drain pipe 114 and the drain pump 106. In this embodiment, the space 111 is decompressed to 2 kPa. Moreover, the height relationship between the water supply pipe 113 and the drain pipe 114 inside the CO2 release tank (storage section) 101 is preferably a height relationship in which the liquid 100 with a reduced residual carbon dioxide concentration is drained, and is not limited thereto because it differs depending on the liquid 100 that is the solvent.

[0040] In this embodiment, the liquid 100 is drained by the drain pump 106, but the upper limit of the pumping height H2 is determined by a principle called the "Torricelli vacuum height", and when seawater at sea level 0 m is pumped, the pumping height H2 is about 10 m. The Torricelli vacuum height is determined by the relationship between the vapor pressure of the liquid 100, the weight density of the liquid 100, and the atmospheric pressure at the sea level H1. In other words, the carbon dioxide capture device in this embodiment is provided with a water supply pipe 113, which is a structure for suppressing the flow rate of the water supply path that supplies the liquid to the storage unit 101, and a drain pipe 114, which is a drain mechanism for draining the liquid from the storage unit. Also, the liquid level of the liquid inside the storage unit 101 is lower than the Torricelli vacuum height in the storage unit. The liquid level of the liquid 100 described above varies depending on the atmospheric pressure, the temperature of the liquid 100, the degree of vacuum inside the CO2 release tank (storage unit) 101, and the constituent elements of the liquid 100.

[0041] Furthermore, when the pumping height H2 is the Torricelli vacuum height, the liquid 100 will be drained by its own weight even without the drainage pump 106, so the configuration may not require the drainage pump 106. Furthermore, when supplying and draining the liquid 100 using both the pumping pump 104 and the drainage pump 106, the pumping height H2 can be set to any height equal to or lower than the Torricelli vacuum height. Alternatively, the pumping height may be adjusted by reducing the supply flow rate of the liquid 100 using a flow rate suppression mechanism and draining the liquid 100 using the drainage pump 106.

[0042] The flow rate suppression mechanism described above may be any mechanism capable of increasing the flow resistance of the water being supplied, and may be, for example, a structure in which a flow rate adjustment valve is provided in the water supply pipe 113, or a structure in which the diameter of the water supply pipe 113 is narrowed.

[0043] When the pumping height H2 is set to the Torricelli vacuum height, the liquid 100 can be drained using the drainage pump 106. Specifically, even if the configuration does not include the pumping pump 104, the liquid 100 is pumped due to the relationship between the pressure inside the CO2 release tank (storage section) 101 and the atmospheric pressure that the liquid 100 receives. Therefore, from the viewpoint of power saving, it is desirable to use either the pumping pump 104 or the drainage pump 106.

[0044] In this embodiment, liquid 100 is circulated within the device by the siphon principle. Therefore, when liquid 100 is circulated by pumping with pump 104, only a small amount of pumping is required, and therefore the liquid can be circulated with little pump drive power.

[0045] Carbon dioxide released into the reduced pressure space 111 is collected by the vacuum pump 102 through the water vapor filter 115, temporarily stored in a carbon dioxide buffer tank 116, and then stored in the CO2 storage unit (accumulation unit) 108 by the pressure pump 117. In this embodiment, the collected carbon dioxide is stored in the CO2 storage unit (accumulation unit) 108 at a pressure equal to or higher than atmospheric pressure.

[0046] In this embodiment, the water supply pipe 113 is a vibration transmission part that transmits the vibration of the water lifting pump 104, which is a vibration source, to the liquid 100 inside the CO2 release tank (storage part) 101. In addition, the drain pipe 114 is a vibration transmission part that transmits the vibration of the drainage pump 106. The water supply pipe 113 and the drain pipe 114 are stainless steel pipes, but the material is not limited. With this configuration, the vibration of the water lifting pump 104 is transmitted to the water supply pipe 113, which is a vibration transmission part, and the water supply pipe vibrates, and the vibration of the water supply pipe 113 is transmitted to the storage part 111, thereby releasing carbon dioxide from the liquid in the storage part 101. In addition, the vibration of the drainage pump 106 is transmitted to the storage part 111 by the drain pipe 114, which is a vibration transmission part, vibrating, and carbon dioxide is further released from the liquid in the storage part 101. As in the first embodiment, the vibration of the vacuum pump may be caused to function via a vibration transmission unit, or may be appropriately combined with any of the vibration transmission units described above.

[0047] The vibration frequency of a water pump or a drainage pump varies depending on the structure, such as the rotation speed of the motor and the number of blades that generate the water flow. It is generally known that the vibration energy increases as the frequency increases for the same amplitude, and there is no restriction on the vibration frequency as long as it can promote the generation of bubbles 110 from the liquid 100.

[0048] In this embodiment, the liquid 100 is seawater, but any liquid containing dissolved carbon dioxide may be used, such as rainwater, river water, lake water, tap water, a basic aqueous solution, or a fluorine-based active liquid, and is not limited to seawater. In addition, the liquid 100 may be combined with the configuration described in the first embodiment in which the liquid 100 is exposed to the atmosphere to capture carbon dioxide in the atmosphere, to form a circulatory carbon dioxide capture device.

[0049] [Third embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0050] In particular, the differences from the above-mentioned embodiment will be described. In this embodiment, the liquid 300 in which carbon dioxide is dissolved is river water, and the height of the drain outlet 118, which is the drain surface, is lower than the height of the surface of the liquid 300, which is the water supply surface where the water supply port is arranged. The water supply port is also provided vertically above the drain outlet. In this embodiment, the carbon dioxide capture device is configured in this way, so that the supplied liquid 300 can be circulated and drained inside the carbon dioxide capture device by the principle of a siphon without requiring a power source to move the liquid. In this embodiment, the drain outlet 118 and the drained liquid 301 are configured not to come into contact with each other, but as long as the configuration allows drainage by the principle of a siphon, it does not matter whether they come into contact with each other.

[0051] A generator 302, which is a hydraulic generator, is attached to the flow path of the drain pipe 114, and hydroelectric power is generated based on the potential energy associated with the drainage of the liquid 300. The power generated by the generator 302 is used as the power source for the vacuum pump 102, the pressure pump 117, and the device control system. The vibration generated by the generator 302 is transmitted to the liquid 300 in the storage unit 101 by the drain pipe 114, which is a vibration transmission unit. The vibration frequency caused by the generator 302 generating electricity varies depending on the number of blades that convert the water flow into rotational motion and the number of revolutions of the generator, but the vibration amplitude and vibration frequency are not limited as long as they can promote the generation of bubbles 110 from the carbon dioxide dissolved in the liquid 300. The material of the drain pipe 114 is a stainless steel pipe, but it may be a polyvinyl chloride pipe or an iron pipe, and the material is not limited.

[0052] The height of the liquid surface of the liquid 300 varies depending on the atmospheric pressure, the temperature of the liquid 300, the degree of vacuum inside the CO2 release tank (storage section) 101, and the constituent elements of the liquid 300. In this embodiment, the degree of vacuum inside the CO2 release tank (storage section) 101 is set to about 2 kPa, and the height from the air contact surface of the liquid 300 to the liquid surface of the liquid 300 inside the CO2 release tank (storage section) 101 is set to about 10 m. The length of the drain pipe 114 is set to 10 m or more, so that the generator 302 can obtain sufficient potential energy of the liquid 300 to generate electricity.

[0053] [Fourth embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0054] In this embodiment, a mechanism for floating on the water surface is provided for the carbon dioxide device configuration in the second embodiment. The liquid 400 in which carbon dioxide is dissolved is seawater, but may be fresh water such as river water or lake water. The floating body 401 is, for example, the hull of a ship, and has an engine 402, which is an internal combustion engine for the purpose of sailing the ship. That is, the vibration source in this embodiment is, for example, a propulsion engine of the ship. Note that the engine 402 may be an engine for generating electricity, and the use of the engine is not limited, and for example, the vibration source may be an engine for generating electricity. Also, in this embodiment, the floating body 401 is a ship, but it may be any structure that floats on the water surface, for example, a wind power generator floating on the ocean.

[0055] The vibration frequency generated by the engine 402 changes depending on the rotation speed as an internal combustion engine. The vibration generated by the engine 402 is transmitted to the water supply pipe 113 and the drain pipe 114 via the floating body 401, and then to the liquid 400 inside the CO2 release tank (storage section) 101. In other words, the vibration generated by the engine 402 promotes the release of carbon dioxide from the liquid 400 inside the CO2 release tank (storage section) 101. In this embodiment, the water supply pipe 113 and the drain pipe 114 are the vibration transmission sections, but a separate structure serving as the vibration transmission section may be provided.

[0056] In addition, since the liquid 400 is seawater and the floating body 401 floats on the seawater, it sways due to wave forces caused by weather. When the floating body 401 sways, the liquid 400 inside the CO2 release tank (storage section) 101 sways. The vibration frequency of the hull due to the influence of wave forces varies depending on the size and structure of the hull, but is approximately 0.1 Hz to 1 Hz. Since the CO2 release tank (storage section) 101 is installed at a height of approximately 10 m above sea level, the vibration amplitude due to the influence of wave forces is large, which promotes the release of carbon dioxide from the liquid 400 inside the CO2 release tank (storage section) 101. The height of the liquid surface of the liquid 400 described above changes depending on the air pressure, the temperature of the liquid 400, the degree of vacuum inside the CO2 release tank (storage section) 101, and the constituent elements of the liquid 100.

[0057] The buffer tank 404 is intended to prevent the vacuum pump 102 from sucking in the liquid 400 inside the CO2 release tank (storage section) 101 when the floating body 401 is significantly rocked by the effect of waves, and prevents a small amount of liquid 400 from flowing into the vacuum pump 102. In this embodiment, the CO2 release tank (storage section) 101 and the buffer tank 404 are configured as separate tanks, but a partition plate may be attached inside the CO2 release tank (storage section) 101 to provide separate rooms.

[0058] If the floating body 401 tilts significantly due to the effect of wave force, the valve 403 is closed to prevent the liquid 400 from flowing into the vacuum pump 102. In this embodiment, a sensor is provided to detect the tilt of the hull, and the valve 403 is automatically closed when the tilt exceeds a certain level.

[0059] In this embodiment, the heat generated by the engine 402 is transferred to the liquid 400 via the water supply pipe 113, but a separate heat transfer mechanism may be provided to transfer the heat generated by the engine 402 to the liquid 400. By heating the liquid 400, the release of carbon dioxide from the liquid 400 is promoted.

[0060] [Fifth embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0061] This embodiment is a configuration in which a mechanism for generating electricity by wind power is added to the configuration of the second embodiment. It has a windmill 501, a generator 502 that generates electricity by the rotation of the windmill, and a vibration transmission unit 503 that transmits the vibration of the generator to the liquid 400 inside the CO2 release tank (storage unit) 101. The material of the vibration transmission unit 503 in this embodiment is an iron member, but the material is not limited to this.

[0062] The vibration frequency of the generator 502 varies depending on the structure, such as the rotation speed of the windmill and the number of blades. Wind power generators often generate vibrations in the low frequency range of several tens of Hz or less. It is generally known that the higher the frequency, the greater the vibration energy is at the same amplitude, and a larger amplitude promotes the release of carbon dioxide from the liquid 100. There are no limitations on the vibration frequency as long as it promotes the generation of bubbles 110 from the liquid 100.

[0063] A wind power generator needs to be tall enough to prevent the windmill 501 from coming into contact with the ground. For this reason, in this embodiment, the height of the liquid surface of the liquid 100 inside the CO2 release tank (storage section) 101 is set to about 10 m from the height of the water intake surface. The height of the liquid surface of the liquid 100 described above varies depending on the atmospheric pressure, the temperature of the liquid 100, the degree of vacuum inside the CO2 release tank (storage section) 101, and the constituent elements of the liquid 100.

[0064] In this embodiment, the CO2 release tank (storage section) 101 is installed at a predetermined height by a structure (not shown) built on the ground. The CO2 release tank (storage section) 101 is configured to swing left and right and front and back due to the elasticity of the structure caused by wind force. The CO2 release tank (storage section) 101 swings, causing the liquid 100 inside the CO2 release tank (storage section) 101 to vibrate, promoting the release of carbon dioxide from the liquid 100. The windmill 501 and the generator 502 are installed near the CO2 release tank (storage section) 101, but it is only necessary that the vibration transmission section 503 transmits the vibration to the CO2 release tank (storage section) 101. For example, the windmill 501 and the generator 502 may be installed at a height of about 40 m, and the positional relationship is not limited. The above-mentioned structure is made of iron material, but it may be made of metals and alloys such as stainless steel and aluminum, concrete, or wood, and the material is not limited.

[0065] Although the liquid 100 is seawater, it may be fresh water. The configuration in this embodiment may be combined with the floating body 401 described in embodiment 4. In this embodiment, the configuration is provided with two pumps, the lifting pump 104 and the drainage pump 106, but the liquid 100 can be circulated if either one of the pumps is provided, and the pump configuration is not limited.

[0066] [Sixth embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0067] In this embodiment, in contrast to the configuration in the first embodiment, a CO2 release tank (storage unit) 101 and a vacuum pump 102 are installed on a vibration transmission unit 103. The vacuum pump 102 is a DA-20D model manufactured by ULVAC, and when the vibration frequency was measured, the main vibration frequency peak was 50 Hz. The vibration transmission unit 103 was a top plate of a typical stainless steel laboratory equipment rack, and the elastic unit 123 was a plastic caster for the rack.

[0068] The piping connecting the vacuum pump 102 and the water vapor filter 115, and the piping connecting the vacuum pump 102 and the carbon dioxide buffer tank 116 are made of flexible resin piping, so that the installation position of the vacuum pump 102 can be easily changed.

[0069] 6(B) shows the results of measuring the change in CO2 capture amount over time when the vacuum pump 102 is installed on the vibration transmission part 103 and when it is installed on the equipment stand 124. In this embodiment, the liquid 100 is seawater, and the measurement was performed with the injection valve 105 and the drain valve 107 closed and the liquid 100 not circulating. When the vacuum pump 102 is installed on the vibration transmission part 103, more CO2 can be captured in a short time compared to when it is installed on the equipment stand 124.

[0070] In addition, in a measurement in which the vacuum pump 102 was installed on the device stand 124, when the installation location of the vacuum pump 102 was changed to above the vibration transmission part 103 during the measurement, the CO2 capture rate was found to be faster.

[0071] This measurement was performed in a state where liquid 100 was not circulating, but this was for the purpose of measurement, and carbon dioxide may be continuously collected by opening injection valve 105 and drain valve 107 and circulating the liquid with drain pump 601. The model number of vacuum pump 102 was used for measurement experiments, and is not intended to limit the model number or type of the vacuum pump.

[0072] The method of circulating the liquid 100 may be a method of draining the liquid 100 from the CO2 release tank (storage unit) 101 and then pouring new water in. Alternatively, when draining the liquid, a method of returning the internal pressure of the CO2 release tank (storage unit) 101 to atmospheric pressure may be used, and the method of circulating the liquid is not limited.

[0073] [Seventh embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0074] In this embodiment, in contrast to the configuration of the third embodiment, a structure is provided inside water supply pipe 113 that narrows the width of the flow path, and a vibration generating unit 701 is provided that generates vibrations due to changes in water flow. The vibration generating unit 701 causes local changes in water pressure in liquid 100, causing cavitation or the water hammer phenomenon, which generates vibrations. In other words, the vibration generating unit 701 is characterized by transmitting vibrations generated by at least one of cavitation and the water hammer phenomenon, which are caused by local changes in water pressure inside the liquid due to the flow of the liquid.

[0075] The vibrations generated by the vibration generating unit 701 are transmitted to the liquid 100 inside the CO2 release tank (storage unit) 101 by the water supply pipe 113, which is a vibration transmitting unit. The vibration generating unit 701 may generate vibrations by changing the water flow, and the structure of the vibration generating unit 701 may be, for example, a screw, a floating structure of metal spheres, stone grains, or pieces of wood, marine organisms such as crustaceans or shellfish, or marine plants such as seaweed.

[0076] In this embodiment, the vibration generating unit 701 is made of stainless steel, but the material is not limited to this. In this embodiment, the liquid 100 is river water, and the liquid level of the liquid 100 is in a positional relationship in which the water supply side liquid level 300 is higher than the water discharge side liquid level 301, and the liquid 100 is circulated by the siphon principle. However, it may be configured to circulate seawater, in which the water supply side liquid level 300 and the water discharge side liquid level 301 are the same level, by a circulation pump.

[0077] [Eighth embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0078] In this embodiment, unlike the configuration of the seventh embodiment, the liquid level of the liquid 100 is in a positional relationship in which the water supply side liquid level 300 is higher than the drain side liquid level 301, and the liquid 100 flows due to the difference between atmospheric pressure and the pressure inside the CO2 release tank (storage section) 101.

[0079] The flow rate of the liquid 100 injected into the CO2 release tank (storage section) 101 is adjusted by the injection valve 105. Vibrations caused by the liquid 100 passing through the injection valve 105 are transmitted to the liquid 100 inside the CO2 release tank (storage section) 101 by the water supply pipe 113, which is a vibration transmission section.

[0080] The liquid 100 inside the CO2 release tank (storage section) 101 is configured to be drained from the drain outlet 118 by its own weight, but it may be drained by providing a separate auxiliary circulation pump for the purpose of drainage.

[0081] [Ninth embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0082] The present embodiment differs from the eighth embodiment in that the liquid 100 poured into the CO2 release tank (storage unit) 101 is caused to collide with a vibration transmission unit 901 to generate vibrations, which are then transmitted to the liquid 100. The vibrations generated by the collision are transmitted to the entire liquid 100 in the CO2 release tank by the liquid 100 inside the CO2 release tank (storage unit) 101.

[0083] In this embodiment, the injected liquid 100 is configured to collide with the vibration transmission unit 901 to generate vibrations. However, it may be configured to collide with the liquid 100 inside the CO2 release tank (storage unit) 101, and transmit the generated collision energy to the vibration transmission unit 901 via the liquid 100. In other words, the vibration transmission unit 901 may transmit vibrations generated by the injected liquid colliding with the liquid stored in the storage unit. [Explanation of symbols]

[0084] 100 liquid 101 CO2 release tank (storage section) 102 Vacuum Pump 103 Vibration transmission part 104 Infusion pump 105 Injection valve 106 Valve 107 Drain valve 108 CO2 storage unit (accumulation unit) 109 Heating section 110 Bubbles 111 Space 122 Atmospheric leak valve 123 Elastic part 124 Equipment stand

Claims

1. A storage section configured by a partition wall that separates the atmosphere from an internal space, and that stores a liquid in which carbon dioxide is dissolved in the internal space; a vibration transmission unit that transmits vibrations from a vibration source disposed in the storage unit or in the vicinity of the storage unit to the liquid stored in the storage unit; a storage unit that collects and stores the carbon dioxide released from the liquid by the vibration transmitted through the vibration transmission unit; A carbon dioxide recovery device comprising:

2. 2. The carbon dioxide recovery device according to claim 1, wherein the vibration source is a vacuum pump, a water lifting pump, a drainage pump, a hydroelectric generator, a wind power generator, a ship's propulsion engine, a power generating engine, wave power, or wind power.

3. 2. The carbon dioxide recovery device according to claim 1, wherein the storage portion is supported by the mounting portion via an elastic portion.

4. 2. The carbon dioxide recovery device according to claim 1, wherein the internal space of the storage section is depressurized relative to atmospheric pressure.

5. 2. The carbon dioxide recovery device according to claim 1, further comprising a heating mechanism for heating the liquid stored in the storage section.

6. 2. The carbon dioxide recovery device according to claim 1, wherein the liquid stored in the storage section is drained by its own weight.

7. 2. The carbon dioxide recovery device according to claim 1, wherein the storage section has a water supply port and a water drain port, and the water supply port is provided vertically above the water drain port with respect to the liquid level.

8. 8. The carbon dioxide recovery device according to claim 7, wherein the liquid in which the carbon dioxide is dissolved circulates by the siphon principle.

9. 2. The carbon dioxide recovery device according to claim 1, wherein the storage section has an internal space formed with a Torricelli vacuum space.

10. The carbon dioxide recovery device according to claim 1, characterized in that a structure for suppressing a flow rate is provided in a water supply passage that supplies liquid to the storage section, a drainage mechanism is provided for draining liquid from the storage section, and the liquid level height of the liquid inside the storage section is lower than the Torricelli vacuum height in the storage section.

11. 2. The carbon dioxide recovery device according to claim 1, wherein the vibration transmitting portion is a metal member.

12. 2. The carbon dioxide recovery device according to claim 1, wherein the vibration is caused by at least one of cavitation and water hammer, which are caused by a change in local water pressure inside the liquid due to the flow of the liquid.

13. The carbon dioxide recovery device according to claim 1, characterized in that the vibration is generated by the injected liquid colliding with the liquid stored in the storage section.

14. a vibration transmitting step of transmitting vibrations from a vibration source disposed in the storage unit or adjacent to the storage unit to the liquid stored in the storage unit, the liquid being constituted by a partition wall separating the atmosphere from an internal space and dissolving carbon dioxide in the internal space; a storage step of collecting and storing the carbon dioxide released from the liquid by the transmitted vibration; A method for recovering carbon dioxide, comprising the steps of:

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