JP4503255B2 - Carbon dioxide recovery device - Google Patents

Description

The present invention, carbon dioxide (CO _2, carbon dioxide) was mixed in the air and the like are released into the atmosphere about the carbon dioxide recovery apparatus for a recovered.

  In general, carbon dioxide is generated by respiration of animals, combustion of fossil fuels such as oil and coal, etc., but in recent years, carbon dioxide emissions have risen sharply and the greenhouse effect absorbs heat released from the ground. As a result, there is a problem of global warming due to the increased concentration. Therefore, research is also progressing to collect and liquefy carbon dioxide, for example, to settle in the deep sea.

  By the way, carbon dioxide is recovered in, for example, a boiler that generates a large amount of carbon dioxide. For example, as a carbon dioxide recovery device for a boiler, it is described in Patent Document 1 (Japanese Patent Laid-Open No. 5-168883). Things are known. This is because in the middle of the exhaust gas duct of the boiler, an oxidizer that oxidizes nitrogen monoxide, sulfur dioxide, etc. in the exhaust gas to nitrogen dioxide and sulfur trioxide is provided, and is oxidized by the oxidizer on the outlet side of the oxidizer Cooling the exhaust gas to condense and separate the water, supply a water to the inside to provide a cooler that dissolves nitrogen dioxide and sulfur trioxide and removes it as nitric acid and sulfuric acid, and compresses and cools the exhaust gas on the outlet side of the cooler. A carbon dioxide liquefying apparatus for liquefying carbon dioxide is provided. In the carbon dioxide liquefier, the exhaust gas is compressed and cooled, the carbon dioxide is liquefied and separated, and the remaining components in the exhaust gas from which the carbon dioxide has been separated, that is, oxygen and nitrogen, are discarded as they are or are otherwise utilized.

  Conventionally, various gases such as oxygen, nitrogen, and argon, and liquefied gas are produced by liquefying rectification separation using air as a raw material. As such an air liquefaction separation apparatus for liquefying and separating such air, for example, the one described in Patent Document 2 (Japanese Patent Laid-Open No. 6-82156) is known. In this method, raw material air compressed by a compressor is cooled with cooling water, then introduced into an adsorber for purification, and then cooled to perform rectification to separate oxygen, nitrogen, and the like. In this air liquefaction separation apparatus, moisture, carbon dioxide, etc. in the raw material air are adsorbed and removed by the adsorbent of the adsorber.

Japanese Patent Laid-Open No. 5-168883 JP-A-6-82156

By the way, the applicant of the present application has been researching to directly recover and liquefy carbon dioxide from the air. In order to do this, for example, it is conceivable to use the former carbon dioxide recovery device described above, but since the amount of carbon dioxide in the air is very low, less than 1%, the carbon dioxide liquefaction device uses air. Even if it is compressed and cooled, there is a problem that the recovery efficiency is poor and cannot be applied as it is.
In the latter air liquefaction separation device, carbon dioxide in the raw material air is adsorbed and removed by the adsorbent of the adsorber, so it is not practically applicable because only carbon dioxide cannot be taken out and liquefied. Even if rectification is carried out without adsorbing carbon dioxide, other gases must be compressed and cooled together, so that there is a problem that the recovery efficiency deteriorates accordingly.
The present invention has been made in consideration of the above problems, to provide a carbon dioxide recovery apparatus that a small amount of carbon dioxide in a gas such as air can be selectively and efficiently liquefied recovered Objective.

In order to achieve such an object, a carbon dioxide liquefaction method according to the carbon dioxide recovery apparatus of the present invention supplies carbon dioxide or a gas containing carbon dioxide into a sealed container and also supplies liquid nitrogen into the container. In this container, heat exchange between carbon dioxide and liquid nitrogen is performed to liquefy carbon dioxide. Thereby, when recovering liquefied carbon dioxide, carbon dioxide or a gas containing carbon dioxide and liquid nitrogen are supplied into the container, and by this supply, heat exchange between carbon dioxide and liquid nitrogen is performed in the container. The carbon dioxide liquefies and flows down to the bottom of the container. In this case, carbon dioxide can be liquefied, and not only a large amount of carbon dioxide but also a small amount of carbon dioxide in the air can be selectively and efficiently liquefied. A gas other than the liquefied carbon dioxide may be exhausted.

  In addition, a carbon dioxide recovery device of the present invention for achieving the above-described object includes a sealed container capable of storing liquefied carbon dioxide at the bottom, and a rotationally provided air provided in the container for suctioning air by centrifugal force. Carbon dioxide is separated and compressed and collected on the outer peripheral side, and the separated and collected carbon dioxide is injected into the container from a plurality of injection ports provided on the outer periphery together with liquid nitrogen. A hollow rotating body that liquefies carbon dioxide by performing heat exchange with the motor, a drive unit that rotates the rotating body, and an air conduction unit that conducts while cooling the air that is communicated to and sucked from the rotating body. An exhaust section for exhausting unnecessary gas from the rotating body; a liquid nitrogen ejector that is provided in the rotating body and jets the liquid nitrogen into the rotating body so that the liquid nitrogen can be ejected from an ejection port of the rotating body; and the liquid nitrogen A liquid nitrogen supply part for supplying liquid nitrogen to Detai has a structure in which a pump for taking out the liquefied carbon dioxide accumulated in the bottom portion of the container is liquefied in the vessel.

Thereby, when recovering liquefied carbon dioxide, it becomes as follows. Normally, the rotating body is rotated by the drive unit, and liquid nitrogen liquefied from the liquid nitrogen supply unit is supplied to the liquid nitrogen ejecting body, and liquid nitrogen is ejected from the liquid nitrogen ejecting body to the rotating body. . Then, air is taken in by the rotation of the rotating body, and the introduced air is centrifugally compressed in the rotating body, whereby carbon dioxide is separated and compressed and collected on the outer peripheral side of the rotating body. Further, unnecessary gas in the rotating body is exhausted from the exhaust part.
Then, the carbon dioxide compressed and collected on the outer peripheral side of the rotating body is injected into the container from a plurality of injection ports provided on the outer periphery of the rotating body together with the liquid nitrogen ejected from the outlet of the liquid nitrogen ejecting body. It is done. By this injection, heat exchange between carbon dioxide and liquid nitrogen is performed in the container, and the carbon dioxide is liquefied and flows down to the bottom of the container. In this case, carbon dioxide is separated and compressed and collected on the outer peripheral side of the rotating body, and only the compressed and collected carbon dioxide is liquefied, so that a small amount of carbon dioxide in the air is selectively and efficiently collected. It liquefies. The liquefied carbon dioxide liquefied in the container and stored at the bottom of the container is taken out by a pump.

And if needed, the inner wall of the rotating body was provided with blades for centrifugally compressing air by rotation. Since it is mechanically compressed by the blades, the apparatus is simple and air can be easily sucked.
Further, if necessary, the liquid nitrogen supply unit includes a compressor that collects and compresses nitrogen vaporized in the container, and a condenser that cools and liquefies nitrogen compressed by the compressor. The liquid nitrogen liquefied by the condenser is supplied again to the liquid nitrogen jet body, and the nitrogen is circulated for use.
As a result, the liquid nitrogen injected into the container from the plurality of injection ports provided on the outer periphery of the rotating body is vaporized when heat exchange between carbon dioxide and liquid nitrogen is performed in the container, but is sucked by the compressor. Then, it is sent to the condenser, cooled by the condenser, liquefied, and supplied again to the liquid nitrogen jet. Therefore, since nitrogen is circulated and used, it is not necessary to supply liquid nitrogen separately, and the processing efficiency is improved accordingly.

In this case, it is effective that the condenser is cooled by air using the exhaust from the exhaust section. In the condenser, air cooling is performed by exchanging heat of the exhaust, so that the heat efficiency is high and labor saving is achieved.
In the above case, it is effective that the condenser is water-cooled using cold water cooled by the container. In the condenser, water cooling is performed using the cold water cooled by the container, so that the heat efficiency is good and labor saving is achieved.

Further, if necessary, the rotating body is rotatably accommodated in a container, an opening is provided in the upper part of the rotating body, and a cylindrical shape is sealed and communicated with the opening of the rotating body in the upper part of the container. An air continuity having a tower body, the air conduction portion being provided in the tower body, having an air inlet through which air flows in at the upper end, and an air outlet through which air flows out at the lower end. A pipe is provided, the exhaust part is provided with an exhaust passage provided in the tower body and formed outside the air conduction pipe, and the liquid nitrogen supply part is provided in the air conduction pipe. Is provided with a liquid nitrogen feed pipe that feeds the liquid nitrogen jet body to the liquid nitrogen jet body.
As a result, due to the rotation of the rotating body, air flows out into the rotating body through the air conduction pipe. In this process, the air in the air conduction pipe is cooled by the exhaust of the exhaust passage, and the liquid nitrogen supply section Since the liquid nitrogen feed pipe cools the air in the air conduction pipe, the thermal efficiency is good and labor saving is achieved.

Further, the rotating body is rotatably accommodated in a container, an opening is provided in an upper portion of the rotating body, and a cylindrical tower body is provided on the upper portion of the container so as to be sealed and communicated with the opening of the rotating body. The air conduction portion is provided in the tower body and includes an air conduction pipe having an air inlet through which air flows in at the upper end and an air outlet through which the air flows out from the container at the lower end. The exhaust section is provided with an exhaust passage provided in the tower body and formed outside the air conduction pipe,
The liquid nitrogen supply unit includes a compressor that collects and compresses nitrogen vaporized in the container, and a condenser that cools and liquefies the nitrogen compressed by the compressor, and liquefies with the condenser The supplied liquid nitrogen is supplied again to the liquid nitrogen jet body so that the nitrogen is circulated and used, and the condenser is provided on the outer periphery of the tower body and communicates with the exhaust passage at the upper part thereof. A hollow air-cooled body having an exhaust inlet and an exhaust outlet through which exhaust flows out, and a heat exchange pipe provided in the air-cooled body and through which nitrogen from the compressor flows. ,
Further, the liquid nitrogen supply unit is provided with a liquid nitrogen supply pipe that is provided in the air conduction pipe and supplies liquid nitrogen to the liquid nitrogen jet.
Thereby, in a condenser, since it cools by heat exchange of exhaust_gas | exhaustion, heat efficiency is good and labor saving is achieved. The rotation of the rotating body causes air to flow out into the rotating body through the air conduction pipe. In this process, the air in the air conduction pipe is cooled by the exhaust of the exhaust passage, and the liquid nitrogen supply section Since the air in the air conduction pipe is cooled by the liquid nitrogen supply pipe, the thermal efficiency is good and labor saving is achieved.

  Then, if necessary, a roof is formed above the tower body, and the air conduction portion is provided on the attic of the roof and has an air intake at the eaves of the roof, and communicates with the air inlet of the air conduction pipe. The liquid nitrogen supply pipe of the liquid nitrogen supply unit is also arranged in the air passage. The rotation of the rotating body causes air to be taken in from the air intake at the eaves of the roof, and the introduced air flows into the air conducting pipe through the air passage and flows out to the rotating body through the air conducting pipe. In this process, the air in the air conduction pipe is cooled by the exhaust of the exhaust passage, and the air in the air conduction pipe and the air passage is cooled by the liquid nitrogen supply pipe of the liquid nitrogen supply section. Labor saving is achieved.

In the present invention, if necessary, the rotating body is configured to have a cylindrical member protruding from the upper side in the container and having an opening in the upper portion, and air is rotated by rotation on the inner wall of the cylindrical member. Another blade for centrifugal compression is provided. Air is reliably sucked and the compression performance is improved.
Further, if necessary, the rotating body is configured to have a cylindrical member that protrudes from the upper side in the container and has an opening in the upper portion thereof, and the inner wall of the cylindrical member is centrifugally compressed by rotation. And provided with
The liquid nitrogen supply unit includes a compressor that collects and compresses nitrogen vaporized in the container, and a condenser that cools and liquefies the nitrogen compressed by the compressor, and liquefies with the condenser The liquid nitrogen is supplied again to the liquid nitrogen jet body so that the nitrogen is circulated and used, and the condenser is provided on the outer periphery of the cylindrical member of the rotating body and is cooled by the container. A water-cooled body that is circulated by a circulation pump and a heat exchange pipe that is provided in the water-cooled body and through which nitrogen from the compressor flows are configured.
Thereby, since another blade | wing which centrifugally compresses air by rotation was provided in the inner wall of the cylindrical member, air suction is performed reliably and compression performance is improved. Moreover, since the condenser is water-cooled using the cold water cooled by the container, the thermal efficiency is good and labor saving is achieved.

  In this case, the outer periphery of the cylindrical member of the rotating body is covered including the condenser to form a cooling chamber for the cylindrical member, and water of the water-cooled body is supplied to the water-cooled body of the condenser. The shower is provided with a water spray. Since the tubular member is cooled by the shower, the air passing through the tubular member is cooled, heat efficiency is good, and labor saving is achieved.

  Further, in this case, an inlet for introducing exhaust and outside air from the exhaust pipe into the cooling chamber so as to be exposed to the sprinkling water of the shower, and exhaust and outside air exposed to the watering of the shower to the cooling chamber. It is effective to provide a lead-out port that leads to the outside, and to provide a blower that sucks exhaust and outside air at the lead-out port. Since the exhaust heat of the shower can be exhausted by the exhaust air and the outside air, the heat efficiency is good and the labor can be saved also in this respect.

  Further, in this case, it is effective to provide a liquid nitrogen injection pipe for injecting liquid nitrogen toward carbon dioxide which is branched from the heat exchange pipe of the condenser and is injected from the rotating body in the container. . In addition to being injected from a plurality of injection ports provided on the outer periphery of the rotating body, liquid nitrogen is also injected from the liquid nitrogen injection tube, so that heat exchange between carbon dioxide and liquid nitrogen is further performed in the container. Surely done.

  Furthermore, in this case, if necessary, a roof is formed above the cylindrical member of the rotating body, the air conducting portion is provided on the attic of the roof, and an air intake is provided at the eaves of the roof. An air passage that communicates with the opening of the cylindrical member, and the exhaust portion includes an exhaust pipe that is disposed in the air passage from the lower part of the rotating body through the tubular member. A nitrogen supply unit is provided in the exhaust pipe and includes a liquid nitrogen supply pipe for supplying liquid nitrogen to the liquid nitrogen jet. Air is taken in from the air intake at the eaves of the roof by the rotation of the rotating body, and the introduced air flows into the cylindrical member through the air passage and flows out to the lower part of the rotating body. In this process, the air in the cylindrical member and the air passage is cooled by the exhaust of the exhaust pipe, and the air in the cylindrical member and the air passage is cooled via the exhaust pipe by the liquid nitrogen supply pipe of the liquid nitrogen supply unit. Since it is cooled, heat efficiency is good and labor saving is achieved.

According to the carbon dioxide liquefaction method according to the carbon dioxide recovery device of the present invention, carbon dioxide can be liquefied by supplying carbon dioxide or a gas containing carbon dioxide and liquid nitrogen into the container. In addition to carbon dioxide, for example, a small amount of carbon dioxide in the air can be selectively liquefied efficiently.
Further, according to the carbon dioxide recovery apparatus of the present invention, carbon dioxide is separated and compressed and collected on the outer peripheral side of the rotating body, and only the compressed and collected carbon dioxide is liquefied. A small amount of carbon dioxide can be selectively liquefied efficiently, and a small amount of carbon dioxide in the air can be reliably recovered. In addition, when the structure of the liquid nitrogen supply part that supplies liquid nitrogen to the air conduction part, the exhaust part, and the liquid nitrogen ejector is configured to improve the heat exchange efficiency of each gas and liquid, the energy is as low as possible. Thus, the apparatus can be operated and labor saving can be achieved.

Hereinafter, with reference to the accompanying drawings, the engagement Ru carbon dioxide recovery apparatus to the embodiment of the present invention will be described in detail.

1 and 2 show a carbon dioxide recovery device S according to the first embodiment of the present invention. The carbon dioxide recovery device S includes a sealed container 1 capable of storing liquefied carbon dioxide L at the bottom.
The container 1 is formed in a vertically symmetric hollow shape like an “abacus ball” formed by joining the opening edges of two conical cup-shaped members 2 and 3, and corresponds to the joint portion. The cross-sectional U-shaped part 4 to be formed has a maximum diameter. The container 1 is covered with a heat insulating material 5. The container 1 is supported by a plurality of legs 6 provided outside and grounded.
A cylindrical tower 7 is erected on the top of the container 1. A roof 8 is formed above the tower body 7.

  A hollow rotating body 10 is provided in the container 1 so as to be rotatable about an axis coaxial with the container 1. The rotating body 10 sucks air and separates and compresses and collects carbon dioxide on the outer peripheral side by centrifugal force, and also separates and compresses and collects carbon dioxide together with liquid nitrogen from a plurality of injection ports 11 provided on the outer periphery. The carbon dioxide is liquefied by being injected into the container 1 and causing heat exchange between the carbon dioxide and liquid nitrogen in the container 1.

Specifically, the hollow rotating body 10 is formed by joining the opening edges of a dish-shaped cup-shaped member 12 and a conical cup-shaped member 13, and is substantially the same as the container 1, the “abacus ball”. A portion corresponding to the joining portion forms the tip portion 14 having the maximum diameter. A plurality of injection ports 11 for injecting carbon dioxide together with liquid nitrogen are formed at the distal end portion 14 in an equiangular relationship. An opening 15 is provided on the upper side of the rotating body 10, and a cylindrical rotating shaft portion 16 is formed on the opening edge. The rotating shaft portion 16 is rotatably fitted to a ring-shaped bearing portion 17 provided in the container 1. A grease reservoir 18 for supplying grease is formed between the rotary shaft portion 16 and the bearing portion 17 inside the bearing portion 17. As a result, the tower body 7 is sealed in the opening of the rotator 10 and connected to the rotator 10.
On the other hand, a rotating shaft 19 is also provided at the lower portion of the rotating body 10 and is rotatably supported by a support body 22 provided at the lower portion of the container 1 via a bearing 21.
The support body 22 is internally provided with a drive unit 20 made of an electric motor that rotates the rotating body 10 in a liquid-tight state.

In the rotating body 10, air is sucked into the inner wall of the lower cup-shaped member 12 from the air outlet 33 of the air conduction pipe 31, which will be described later, and is centrifugally compressed. A plurality of blades 24 that are separated and compressed and assembled are provided.
On the other hand, on the inner wall of the cup-shaped member 12 facing the opening 15, a plurality of fins 25 are provided for exhausting the unnecessary gas in the rotating body 10 to the opening 15 in connection with the exhaust unit 40 described later. .

  In addition, the carbon dioxide recovery device S according to the embodiment includes an air conduction unit 30 that conducts air that is communicated and sucked to the rotating body 10 while cooling, and an exhaust unit 40 that exhausts unnecessary gas from the rotating body 10. A liquid nitrogen jet 50 that is provided in the rotary body 10 and jets liquid nitrogen into the rotary body 10 so that the liquid nitrogen can be jetted from the injection port 11 of the rotary body 10, and a liquid nitrogen supply that supplies the liquid nitrogen to the liquid nitrogen jet body 50 Part 60.

  Specifically, the air conducting portion 30 is provided in the tower body 7, has an air inlet 32 through which air flows at the upper end, and opens at the lower end near the lower inner wall of the container 1 so that the air flows out. An air conduction pipe 31 having an outlet 33 is provided. The air conducting portion 30 is provided in the attic of the roof 8, has an air intake 34 at the eaves of the roof 8, and includes an air passage 35 communicating with the air inlet 32 of the air conducting pipe 31. .

  The exhaust unit 40 includes an exhaust passage 41 provided in the tower body 7 and formed outside the air conduction pipe 31. The exhaust passage 41 is formed in a spiral shape so that the inside of the air conduction pipe 31 can be cooled. Further, a liquid nitrogen supply pipe 68 described later of the liquid nitrogen supply unit 60 is provided in the air conduction pipe 31 and the air passage 35 so that the inside of the air conduction pipe 31 and the air passage 35 can be cooled.

  The liquid nitrogen ejection body 50 is constituted by a spiral tube 51 spirally formed on a plane in the rotating body 10, and an ejection port 52 that ejects liquid nitrogen to the outside of the outermost tube body of the spiral tube 51 and the like. A plurality of angular relations are provided.

  The liquid nitrogen supply unit 60 for supplying liquid nitrogen to the liquid nitrogen ejector 50 cools the nitrogen compressed by the compressor 61 by a compressor 61 including a compressor that collects and compresses the nitrogen vaporized in the container 1. The liquid nitrogen liquefied by the condenser 62 is supplied again to the liquid nitrogen jet 50 to circulate and use the nitrogen. 63 is a pressure reducing valve for reducing the temperature by reducing the pressure of the liquid nitrogen condensed in the condenser 62. The condenser 62 is configured to be air-cooled using the exhaust from the exhaust unit 40.

Specifically, the condenser 62 is a hollow provided on the outer periphery of the tower body 7 and has an exhaust inlet 64 through which the exhaust flows in and communicates with the exhaust passage 41 at the upper part and an exhaust outlet 65 through which the exhaust flows out. The air-cooled body 66 and a heat exchange pipe 67 that is provided in the air-cooled body 66 and into which nitrogen from the compressor 61 flows are configured.
In the liquid nitrogen supply unit 60, a liquid nitrogen supply pipe 68 that reaches the liquid nitrogen ejector 50 is connected to the heat exchange pipe 67. The liquid nitrogen supply pipe 68 is provided in the air conduction pipe 31 and the air passage 35 so that the inside of the air conduction pipe 31 and the air passage 35 can be cooled.

  Furthermore, a pump 80 for taking out the liquefied carbon dioxide L liquefied in the container 1 and stored in the bottom of the container 1 is provided outside the lowermost end of the container 1. The pump 80 is connected to a feed pipe 82 that has an open / close valve 81 and feeds liquefied carbon dioxide L. A cylinder 83 is connected to the feed pipe 82, and the liquefied carbon dioxide L is stored in the cylinder 83. Like to do.

Therefore, according to the carbon dioxide recovery device S according to the first embodiment, the liquefied carbon dioxide L is recovered as follows.
Normally, the rotating body 10 is rotated by the drive unit 20 made of an electric motor, and the compressor 61 of the liquid nitrogen supply unit 60 is driven to compress nitrogen and send it to the condenser 62. Nitrogen is cooled and liquefied, and the liquid nitrogen liquefied by the condenser 62 is supplied to the liquid nitrogen jet 50 through the liquid nitrogen supply pipe 68.

By the rotation of the rotating body 10, a suction force is applied by the plurality of blades 24 and the plurality of fins 25 of the rotating body 10, and air is taken in from the air intake 34 at the eaves of the roof 8. The air flows into the air inlet 32 of the air conduction pipe 31 through the passage 35 and flows out from the air outlet 33 through the air conduction pipe 31. In this process, the air in the air conduction pipe 31 is cooled by the exhaust of the exhaust passage 41, and the air in the air conduction pipe 31 and the air passage 35 is cooled by the liquid nitrogen supply pipe 68 of the liquid nitrogen supply unit 60. Is done.
Further, liquid nitrogen is ejected from the ejection port 52 of the liquid nitrogen ejection body 50 toward the outer peripheral portion of the rotating body 10.

The air flowing out from the air outlet 33 through the air conducting pipe 31 is centrifugally compressed by the plurality of blades 24 in the rotating body 10, whereby carbon dioxide is separated and compressed and collected on the outer peripheral side of the rotating body 10. It is done. Further, unnecessary gas in the rotating body 10 is led to the exhaust passage 41 of the exhaust unit 40 and exhausted by the plurality of fins 25.
The carbon dioxide compressed and collected on the outer peripheral side of the rotating body 10 is supplied from a plurality of injection ports 11 provided on the outer periphery of the rotating body 10 together with the liquid nitrogen ejected from the ejection port 52 of the liquid nitrogen ejecting body 50. It is injected into the container 1. By this injection, heat exchange between carbon dioxide and liquid nitrogen is performed in the container 1, and the carbon dioxide is liquefied and flows down to the bottom of the container 1. In this case, carbon dioxide is separated and compressed and collected on the outer peripheral side of the rotating body 10, and only the compressed and collected carbon dioxide is liquefied, so that a small amount of carbon dioxide in the air is selectively efficient. It liquefies well. The liquefied carbon dioxide L liquefied in the container 1 and stored at the bottom of the container 1 is taken out by the pump 80 and stored in the cylinder 83.

  On the other hand, the liquid nitrogen injected into the container 1 from the plurality of injection ports 11 provided on the outer periphery of the rotating body 10 is vaporized when heat exchange between the carbon dioxide and the liquid nitrogen is performed in the container 1, but is compressed. It is sucked by the machine 61 and sent to the condenser 62, cooled and liquefied by the condenser 62, and supplied again to the liquid nitrogen jet 50. Therefore, since nitrogen is circulated and used, it is not necessary to supply liquid nitrogen separately, and the processing efficiency is improved accordingly. Further, in the condenser 62, the exhaust from the exhaust passage 41 is caused to flow into the air cooling body 66, and air is cooled by heat exchange of the exhaust through the heat exchange pipe 67, so that heat efficiency is high and labor saving is achieved.

3 and 4 show a carbon dioxide recovery device S according to the second embodiment of the present invention. The same components as those described above will be described with the same reference numerals. The carbon dioxide recovery device S includes a sealed container 1 capable of storing liquefied carbon dioxide L at the bottom.
The container 1 is formed in a hollow shape like a “koma” formed by joining the opening edges of a cylindrical cup-shaped member 2 and a conical cup-shaped member 3. Further, the outer surface portion of the container 1 is formed in a storage tank 70 in which water is stored, and the water in the storage tank 70 is cooled by the container 1. The container 1 is supported by a plurality of legs 6 provided outside and grounded.
A cylindrical tower 71 is erected on the upper part of the cylindrical cup-shaped members 2 and 3 of the container 1. A ceiling portion 72 is provided on the upper portion of the tower body 71, and a roof 8 is formed above the ceiling portion 72. The space between the roof 8 and the ceiling 72 is configured as an air passage 35 described later.

  A rotating body 10 is provided in the container 1 so as to be rotatable about an axis coaxial with the container 1. The rotating body 10 sucks air and separates and compresses and collects carbon dioxide on the outer peripheral side by centrifugal force, and also separates and compresses and collects carbon dioxide together with liquid nitrogen from a plurality of injection ports 11 provided on the outer periphery. The carbon dioxide is liquefied by being injected into the container 1 and causing heat exchange between the carbon dioxide and liquid nitrogen in the container 1.

  Specifically, the rotating body 10 is a substantially “abacus ball” formed by joining the opening edges of a dish-shaped cup-shaped member 12 and a member 74 having a frustoconical shape and having an opening 73 on the upper side. A hollow member 75 having such a shape, and a cylindrical member 76 provided in communication with the upper opening 73 of the hollow member 75 and projecting from the upper side of the container 1 and having an opening 77 in the upper portion. Configured. A portion corresponding to the joint portion of the hollow member 75 constitutes the distal end portion 14 having the maximum diameter. A plurality of injection ports 11 for injecting carbon dioxide together with liquid nitrogen are formed at the distal end portion 14 in an equiangular relationship. The lower side of the cylindrical member 76 of the rotating body 10 is rotatably supported by a ring-shaped bearing portion 78 provided in the container 1, and the upper side of the cylindrical member 76 of the rotating body 10 is connected to the ceiling portion 72 of the tower body 71. It is pivotally supported by the provided bearing portion 79. A grease reservoir 90 for supplying grease is formed between the cylindrical member 76 and the bearing portion 78 inside the bearing portion 78.

On the other hand, a rotating shaft 19 is also provided at the lower portion of the rotating body 10 and is rotatably supported by a support body 22 provided at the lower portion of the container 1 via a bearing 21.
The support 22 includes a drive unit 20 made of an electric motor that rotates the rotating body 10 in a liquid-tight state.

In the rotating body 10, the inner wall of the lower cup-shaped member 12 is provided with a plurality of blades 24 that suck air by rotation and centrifugally compress it, and separate and compress and collect carbon dioxide on the outer peripheral side of the rotating body 10. It has been.
In addition, another plurality of blades 91 that centrifugally compress air by rotation are provided on the inner wall of the cylindrical member 76.
The rotating body 10 is also pivotally supported via a bearing 48 in an exhaust pipe 42 of the exhaust unit 40 described later.

  In addition, the carbon dioxide recovery device S according to the embodiment includes an air conduction unit 30 that conducts air that is communicated and sucked to the rotating body 10 while cooling, and an exhaust unit 40 that exhausts unnecessary gas from the rotating body 10. A liquid nitrogen jet 50 that is provided in the rotary body 10 and jets liquid nitrogen into the rotary body 10 so that the liquid nitrogen can be jetted from the injection port 11 of the rotary body 10, and a liquid nitrogen supply that supplies the liquid nitrogen to the liquid nitrogen jet body 50 Part 60.

Specifically, the air conducting portion 30 is configured by providing an air passage 35 provided in the attic of the roof 8, having an air intake 34 at the eaves of the roof 8 and communicating with the opening 77 of the tubular member 76.
The exhaust part 40 includes an exhaust pipe 42 disposed in the air passage 35 from the lower part of the rotating body 10 through the cylindrical member 76, and cools the air. The exhaust inlet 43 of the exhaust pipe 42 opens into the hollow member 75 of the rotating body 10, and the exhaust outlet 44 opens at the center of the outside of the tower body 71. A plurality of blades 92 for centrifugally compressing air in combination with the blades 24 of the rotating body 10 are provided outside the exhaust inlet 43 of the exhaust pipe 42. The rotating body 10 is also supported on the exhaust pipe 42 of the exhaust unit 40 via a bearing 48.
The liquid nitrogen jet body 50 is a ring-shaped pipe body provided on the upper portion of the blade 92 of the exhaust pipe 42, and is configured by providing a plurality of jet outlets 52 for jetting liquid nitrogen on the outside thereof in an equiangular relationship.

The liquid nitrogen supply unit 60 for supplying liquid nitrogen to the liquid nitrogen ejector 50 cools the nitrogen compressed by the compressor 61 by a compressor 61 including a compressor that collects and compresses the nitrogen vaporized in the container 1. The liquid nitrogen liquefied by the condenser 62 is supplied again to the liquid nitrogen jet 50 to circulate and use the nitrogen. The liquid nitrogen supply unit 60 includes a liquid nitrogen supply pipe 68 that is provided in the exhaust pipe 42 and supplies liquid nitrogen to the liquid nitrogen ejector 50.
The condenser 62 is configured to be water-cooled using the cold water in the storage tank 70 cooled by the container 1. Specifically, the condenser 62 is provided on the outer periphery of the cylindrical member 76 of the rotating body 10, the cold water cooled by the container 1 is circulated by the circulation pump 80, and the above-described compressor provided in the water cooling body 100. And a heat exchange pipe 67 through which nitrogen from 61 flows.

Then, the outer periphery of the cylindrical member 76 of the rotating body 10 is covered with the tower 71 including the condenser 62 to form the cooling chamber 101 of the cylindrical member 76, and the water-cooled body 100 of the condenser 62 A shower 102 for spraying water from the water-cooled body 100 toward the tubular member 76 is provided.
Into the cooling chamber 101, an introduction port 103 that introduces exhaust and external air from the exhaust pipe 42 so as to be exposed to the water spray of the shower 102, and exhaust and external air exposed to the water spray of the shower 102 are led out to the outside of the cooling chamber 101. And a lead-out port 104 is provided. The outlet 104 is provided with a blower 105 that sucks exhaust air and outside air.

  Further, the container 1 is provided with a liquid nitrogen injection pipe 106 that is branched from the heat exchange pipe 67 of the condenser 62 and injects liquid nitrogen toward carbon dioxide in the container 1 and injected from the rotating body 10. Yes. Reference numeral 107 is an adjustment door provided at the exhaust outlet 44 of the exhaust pipe 42 to adjust the amount of exhaust gas introduced into the inlet 103 of the cooling chamber 101, and reference numeral 108 is drainage from the drain hole 76 a of the cylindrical member 76. It is a drainage device that drains the collected water.

  Furthermore, a pump 80 for taking out the liquefied carbon dioxide L liquefied in the container 1 and stored in the bottom of the container 1 is provided outside the lowermost end of the container 1. The pump 80 is connected to a feed pipe 82 that has an open / close valve 81 and feeds liquefied carbon dioxide L. A cylinder 83 is connected to the feed pipe 82, and the liquefied carbon dioxide L is stored in the cylinder 83. Like to do.

Therefore, according to the carbon dioxide recovery device S according to the second embodiment, the liquefied carbon dioxide L is recovered as follows.
Normally, the rotating body 10 is rotated by the drive unit 20 made of an electric motor, and the compressor 61 of the liquid nitrogen supply unit 60 is driven to compress nitrogen and send it to the condenser 62. Nitrogen is cooled and liquefied, and liquid nitrogen liquefied by the condenser 62 is supplied to the liquid nitrogen jet 50. Liquid nitrogen is ejected from the ejection port 52 of the liquid nitrogen ejection body 50 toward the outer peripheral portion of the rotating body 10. Further, liquid nitrogen is jetted into the container 1 from a liquid nitrogen jet pipe 106.

  By the rotation of the rotating body 10, a suction force acts by the plurality of blades 24, 91 of the rotating body 10 and the blades 92 provided in the exhaust pipe 42, and air is taken in from the air intake 34 at the eaves of the roof 8. The air that has passed through the air passage 35 flows into the opening 77 of the cylindrical member 76 of the rotating body 10 and flows out into the hollow member 75 of the rotating body 10. In this process, in the cooling chamber 101, the air in the cylindrical member 76 is cooled by the watering of the shower 102, the introduction of the exhaust gas, and the outside air, and the exhaust gas in the exhaust pipe 42 and the liquid nitrogen supply unit 60 supplies liquid nitrogen. Air is cooled by the supply pipe 68. Further, in this process, the air in the tubular member 76 and the air passage 35 is cooled by the exhaust of the exhaust pipe 42, and the tubular shape is formed via the exhaust pipe 42 by the liquid nitrogen supply pipe 68 of the liquid nitrogen supply unit 60. Since the air in the member 76 and the air passage 35 is cooled, the thermal efficiency is good and labor saving is achieved.

The air that has flowed into the hollow member 75 of the rotating body 10 is centrifugally compressed, whereby carbon dioxide is separated and compressed and collected on the outer peripheral side of the hollow member 75 of the rotating body 10. Further, unnecessary gas in the rotator 10 is guided to the exhaust inlet 43 of the exhaust pipe 42 of the exhaust unit 40 and exhausted.
The carbon dioxide compressed and collected on the outer peripheral side of the rotating body 10 is supplied from a plurality of injection ports 11 provided on the outer periphery of the rotating body 10 together with the liquid nitrogen ejected from the ejection port 52 of the liquid nitrogen ejecting body 50. It is injected into the container 1. As a result of this jetting, the liquid nitrogen jetted from the liquid nitrogen jet pipe 106 causes heat exchange between carbon dioxide and liquid nitrogen in the container 1, and the carbon dioxide liquefies and flows down to the bottom of the container 1. Go. In this case, in addition to being ejected from the plurality of ejection ports 11 provided on the outer periphery of the rotating body 10, liquid nitrogen is also ejected from the liquid nitrogen ejection pipe 106, so that carbon dioxide and liquid nitrogen are contained in the container 1. The heat exchange with is more reliably performed. Further, carbon dioxide is separated and compressed and collected on the outer peripheral side of the rotating body 10, and only the compressed and collected carbon dioxide is liquefied, so that a small amount of carbon dioxide in the air is selectively and efficiently collected. It liquefies. The liquefied carbon dioxide L liquefied in the container 1 and stored at the bottom of the container 1 is taken out by the pump 80 and stored in the cylinder 83.

  On the other hand, the liquid nitrogen injected into the container 1 from the plurality of injection ports 11 provided on the outer periphery of the rotating body 10 is vaporized when heat exchange between the carbon dioxide and the liquid nitrogen is performed in the container 1, but is compressed. It is sucked by the machine 61 and sent to the condenser 62, cooled and liquefied by the condenser 62, and supplied again to the liquid nitrogen jet 50. Therefore, since nitrogen is circulated and used, it is not necessary to supply liquid nitrogen separately, and the processing efficiency is improved accordingly. Further, in the condenser 62, water is allowed to flow into the water-cooled body 100 and the heat exchange pipe 67 is water-cooled, so that thermal efficiency is good and labor saving is achieved.

It is a figure showing the carbon dioxide recovery device concerning a first embodiment of the present invention. It is an expansion half sectional view showing the carbon dioxide recovery device concerning a first embodiment of the present invention. It is a figure which shows the carbon dioxide collection apparatus which concerns on 2nd embodiment of this invention. It is an enlarged half sectional view showing a carbon dioxide recovery device concerning a second embodiment of the present invention.

Explanation of symbols

S Carbon dioxide recovery device L Liquefied carbon dioxide 1 Container 6 Leg 7 Tower 8 Roof 10 Rotating body 11 Injection port 15 Opening 20 Drive unit 24 Blade 25 Fin 30 Air conduction part 31 Air conduction pipe 34 Air intake 35 Air passage 40 Exhaust part 41 Exhaust passage 42 Exhaust pipe 48 Bearing 50 Liquid nitrogen jet body 52 Jet port 60 Liquid nitrogen supply part 61 Compressor 62 Condenser 66 Air cooling body 67 Heat exchange pipe 68 Liquid nitrogen supply pipe 70 Storage tank 71 Tower body 72 Ceiling Portion 73 Opening 75 Hollow member 76 Cylindrical member 77 Opening 80 Pump 83 Cylinder 91 Blade 92 Blade 100 Water-cooled body 101 Cooling chamber 102 Shower 105 Blower 106 Liquid nitrogen injection pipe

Claims (14)

A sealed container capable of storing liquefied carbon dioxide at the bottom, and the container rotatably provided in the container, and sucking air to separate and compress and collect carbon dioxide on the outer peripheral side by centrifugal force. A hollow rotator for injecting the carbon dioxide with liquid nitrogen into the container from a plurality of injection ports provided on the outer periphery to liquefy carbon dioxide by performing heat exchange between the carbon dioxide and liquid nitrogen in the container; A driving unit that rotates the rotating body, an air conducting unit that conducts air that is communicated to the rotating body while cooling, an exhaust unit that exhausts unnecessary gas from the rotating body, and a rotating body. A liquid nitrogen ejector for ejecting the liquid nitrogen into the rotating body so that the liquid nitrogen can be ejected from an ejection port of the rotating body; a liquid nitrogen supply unit for supplying liquid nitrogen to the liquid nitrogen ejecting body; and a liquefaction in the container The Carbon dioxide recovery apparatus characterized by comprising a pump taking out the liquefied carbon dioxide accumulated in the bottom of the container. 2. The carbon dioxide recovery apparatus according to claim 1, wherein a blade for centrifugally compressing air by rotation is provided on the inner wall of the rotating body. The liquid nitrogen supply unit includes a compressor that collects and compresses nitrogen vaporized in the container, and a condenser that cools and liquefies the nitrogen compressed by the compressor, and liquefies with the condenser The carbon dioxide recovery apparatus according to claim 1 or 2, wherein the liquid nitrogen thus supplied is supplied again to the liquid nitrogen jet body to circulate the nitrogen. 4. The carbon dioxide recovery apparatus according to claim 2, wherein the condenser is configured to be air-cooled using exhaust from the exhaust section. The carbon dioxide recovery apparatus according to claim 2 or 3, wherein the condenser is water-cooled using cold water cooled by the container. The rotating body is rotatably accommodated in a container, an opening is provided in an upper portion of the rotating body, and a cylindrical tower body that is sealed and communicated with the opening of the rotating body is provided on an upper portion of the container, The air conduction part is provided with an air conduction pipe provided in the tower body and having an air inflow port through which air flows into the upper end and an air outflow port through which the air flows out and opens into the container at the lower end, The exhaust part is provided with an exhaust passage provided in the tower body and formed outside the air conduction pipe, and the liquid nitrogen supply part is provided in the air conduction pipe and liquid nitrogen is supplied to the liquid nitrogen jet body. 6. The carbon dioxide recovery apparatus according to claim 1, wherein the apparatus is provided with a liquid nitrogen supply pipe for supply. The rotating body is rotatably accommodated in a container, an opening is provided in an upper portion of the rotating body, and a cylindrical tower body that is sealed and communicated with the opening of the rotating body is provided on an upper portion of the container, The air conduction part is provided with an air conduction pipe provided in the tower body and having an air inflow port through which air flows into the upper end and an air outflow port through which the air flows out and opens into the container at the lower end, The exhaust part is provided with an exhaust passage provided in the tower body and formed outside the air conduction pipe,
The liquid nitrogen supply unit includes a compressor that collects and compresses nitrogen vaporized in the container, and a condenser that cools and liquefies the nitrogen compressed by the compressor, and liquefies with the condenser The supplied liquid nitrogen is again supplied to the liquid nitrogen jet body so that the nitrogen is circulated and used, and the condenser is provided on the outer periphery of the tower body and communicated with the exhaust passage at the upper part thereof. A hollow air-cooled body having an exhaust inlet and an exhaust outlet through which exhaust flows out, and a heat exchange pipe provided in the air-cooled body and through which nitrogen from the compressor flows. ,
The liquid nitrogen supply pipe according to claim 1 or 2, further comprising a liquid nitrogen supply pipe provided in the air conduction pipe for supplying the liquid nitrogen to the liquid nitrogen jet body. Carbon recovery device. A roof is formed above the tower body, and the air conducting portion is provided on the attic of the roof, and has an air passage having an air intake at the eaves of the roof and communicating with the air inlet of the air conducting pipe. The carbon dioxide recovery apparatus according to claim 6 or 7, characterized in that the liquid nitrogen supply pipe of the liquid nitrogen supply section is also disposed in the air passage. The rotating body is configured to have a cylindrical member that protrudes from the upper side in the container and has an opening in the upper portion, and is configured by providing another blade that centrifugally compresses air by rotation on the inner wall of the cylindrical member. The carbon dioxide recovery device according to claim 1, 2, 3, 4 or 5. The rotating body is configured to have a cylindrical member protruding from the upper side in the container and having an opening in the upper portion, and provided with another blade for centrifugally compressing air by rotation on the inner wall of the cylindrical member. ,
The liquid nitrogen supply unit includes a compressor that collects and compresses nitrogen vaporized in the container, and a condenser that cools and liquefies the nitrogen compressed by the compressor, and liquefies with the condenser The liquid nitrogen is supplied again to the liquid nitrogen jet body so that the nitrogen is circulated and used, and the condenser is provided on the outer periphery of the cylindrical member of the rotating body and is cooled by the container. The carbon dioxide recovery device according to claim 1 or 2, comprising a water-cooled body circulated by a circulation pump and a heat exchange pipe provided in the water-cooled body and through which nitrogen from the compressor flows. . The outer periphery of the cylindrical member of the rotating body is covered including the condenser to form a cooling chamber for the cylindrical member, and water of the water-cooled body is directed to the water-cooled body of the condenser toward the cylindrical member. The carbon dioxide recovery apparatus according to claim 10, wherein a shower for watering is provided. An inlet for introducing exhaust and outside air from the exhaust pipe into the cooling chamber so as to be exposed to the sprinkling water of the shower, and a guide for guiding the exhaust and outside air exposed to the watering of the shower to the outside of the cooling chamber. The carbon dioxide recovery apparatus according to claim 11, wherein an outlet is provided, and a blower for sucking exhaust gas and outside air is provided at the outlet. The liquid nitrogen injection pipe which injects liquid nitrogen toward the carbon dioxide which is branched from the heat exchange pipe of the condenser and is injected from the rotary body in the container is provided. The carbon dioxide recovery device described. An air passage is formed above the cylindrical member of the rotating body, the air conducting portion is provided on the attic of the roof, has an air intake at the eaves of the roof, and communicates with the opening of the cylindrical member. The exhaust part is provided with an exhaust pipe disposed in the air passage from the lower part of the rotating body through the cylindrical member, and the liquid nitrogen supply part is provided in the exhaust pipe. The carbon dioxide recovery apparatus according to claim 9, 10, 11, 12, or 13, further comprising a liquid nitrogen supply pipe for supplying liquid nitrogen to the liquid nitrogen ejection body.

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