JP4869367B2 - Carbon dioxide recovery device - Google Patents

Description

  The present invention relates to an oxygen dioxide recovery device that efficiently recovers carbon dioxide from a gas containing carbon dioxide.

  In general, exhaust gas generated by burning fossil fuels such as coal, oil, or LNG in thermal power plants or chemical plants contains a large amount of carbon dioxide. It is necessary to efficiently recover the contained carbon dioxide.

  As a technique for recovering carbon dioxide contained in exhaust gas, a technique for solidifying and separating carbon dioxide in exhaust gas as dry ice is known. For example, in Patent Document 1, exhaust gas is supplied to the inside of a carbon dioxide recovery container, and the inside of the carbon dioxide recovery container is cooled so that carbon dioxide contained in the exhaust gas is dried on the inner surface of the carbon dioxide recovery container. A method of adhering is proposed.

JP 2007-69057 A

  However, in the technique proposed in Patent Document 1, in order to recover the dry ice adhering to the inner surface of the carbon dioxide recovery container, the carbon dioxide recovery container itself is vibrated and attached to the carbon dioxide recovery container by this vibration. It was necessary to separate the dry ice. Therefore, excessive force is constantly applied to the carbon dioxide recovery container, and the carbon dioxide recovery container becomes fatigued. And the fatigue | tightness of the carbon dioxide collection container was impaired by such fatigue, and there existed a possibility that exhaust gas might leak from this carbon dioxide collection container.

  In other words, in the conventional method, as a result of vibration applied to the carbon dioxide recovery container over time, the carbon dioxide recovery container may be deteriorated and damaged, and the carbon dioxide cannot be efficiently recovered. is there.

  Therefore, an object of the present invention is to provide a carbon dioxide recovery device that can efficiently recover carbon dioxide without deteriorating a container into which exhaust gas flows.

(1) The present invention is a carbon dioxide recovery device that solidifies and recovers carbon dioxide contained in a gas, and is configured to have a cylindrical shape and a height direction along a vertical direction. A recovery apparatus main body into which the refrigerant is introduced, a heat transfer pipe that is arranged in the recovery apparatus main body so as to extend in a substantially vertical direction, and in which the refrigerant flows, and solidified carbon dioxide adhering to the peripheral surface of the heat transfer pipe Scraping means for scraping off, and an accommodating portion for storing the solidified carbon dioxide disposed below the recovery apparatus main body and scraped off by the scraping means , wherein the scraping means is the heat transfer tube. A scraping member that is movable in the vertical direction in the vicinity of the peripheral surface, and a drive unit that drives the scraping member in the vertical direction. The scraping member is a horizontal direction in the recovery device main body. The plate-shaped member has a heat transfer tube insertion hole through which the heat transfer tube is inserted and a gas flow hole through which the gas introduced into the recovery device main body flows. It relates to a carbon dioxide recovery device to be formed .

  According to the carbon dioxide recovery device described in (1), the carbon dioxide that has adhered to the heat transfer tube and solidified is scraped off and recovered in the accommodating portion, so there is no need to apply vibration to the recovery device body. Therefore, the carbon dioxide can be efficiently recovered without impairing the airtightness of the recovery device body due to fatigue or the like.

According to the carbon dioxide recovery device described in ( 1 ), the scraping member is disposed so as to be movable in the vertical direction in the vicinity of the peripheral surface of the heat transfer tube, and the scraping member is driven in the vertical direction. Therefore, the carbon dioxide adhered to the heat transfer tube and solidified can be easily and efficiently scraped off.

According to the carbon dioxide recovery device described in ( 1 ), the scraping member is configured by a plate-like member that is substantially the same shape as the horizontal cross-sectional shape of the recovery device body, and the heat transfer tube is inserted through the plate-like member. A gas flow hole through which the gas introduced into the heat pipe insertion hole and the inside of the recovery apparatus main body flows was formed. Thereby, the carbon dioxide which adhered to the heat exchanger tube and solidified can be scraped off favorably, using the scraper member as a guide for the heat exchanger tube. Further, since the gas flows through the gas flow hole, the movement of the scraping member is not impaired by the gas.

( 2 ) The present invention provides the carbon dioxide recovery device according to ( 1 ), wherein the driving means includes a cylinder disposed through the upper surface of the recovery device main body, and a tip slidably accommodated in the cylinder. The side is provided with a piston connected to the scraping member.

According to the carbon dioxide recovery device described in ( 2 ), the driving means includes a cylinder disposed through the upper surface of the recovery device body, and is slidably accommodated in the cylinder, and the tip side is coupled to the scraping member. And a piston. Therefore, the scraping member can be driven in the vertical direction with a simple mechanism.

( 3 ) The present invention provides the carbon dioxide recovery device according to any one of (1) and (2 ), wherein the storage portion is configured by a plurality of storage containers, Switching means for supplying solidified carbon dioxide to a predetermined storage container among the plurality of storage containers is provided.

According to the carbon dioxide recovery device described in ( 3 ), the storage unit is configured with a plurality of storage containers, and the carbon dioxide solidified into a predetermined storage container among the plurality of storage containers is formed on the bottom surface side of the recovery device body. Switching means for supplying carbon was provided. Therefore, the storage container can be selected as necessary, and maintenance of unused storage containers can be performed even during the recovery of carbon dioxide.

( 4 ) According to the present invention, in the carbon dioxide recovery device described in ( 3 ), each of the plurality of storage containers is configured by a container having airtightness and pressure resistance.

According to the carbon dioxide recovery device described in ( 4 ), since each of the storage containers has hermeticity and pressure resistance, if the solidified carbon dioxide is left at atmospheric pressure without pressurization, the temperature naturally increases. The solidified carbon dioxide becomes liquid and can be stored as liquid carbon dioxide.

( 5 ) The present invention provides the carbon dioxide recovery device according to (1) or (2 ) , wherein the scraping member is a predetermined standby position in the recovery device main body and a drive position positioned below the standby position. Control means for controlling the driving means so as to be moved between the two.

According to the carbon dioxide recovery device described in ( 5 ), the scraping member is moved between the predetermined standby position and the drive position. Therefore, carbon dioxide adhering to the heat transfer tube and solidified can be easily scraped off.

( 6 ) In the carbon dioxide recovery device according to ( 5 ), the control unit moves the scraping member at a predetermined time interval and moves the scraping member from the standby position to the driving position. Immediately after driving, the drive means is controlled so that the scraping member is returned from the drive position to the standby position.

According to the carbon dioxide recovery device described in ( 6 ), the scraping member is moved at a predetermined time interval, and after the scraping member is driven from the standby position to the driving position, the scraping member is immediately standby from the driving position. The drive means was controlled to return to the position. Therefore, when the scraping member returns, carbon dioxide is hardly attached to the heat transfer tube, so that there is no possibility of hindering the collection of carbon dioxide.

  According to the present invention, carbon dioxide that has adhered to the heat transfer tube and solidified is scraped off and collected in the accommodating portion, so there is no need to apply vibration to the collection device body. Therefore, the carbon dioxide can be efficiently recovered without impairing the airtightness of the recovery device body due to fatigue or the like.

It is a perspective view showing one embodiment of a carbon dioxide recovery device of the present invention. In the carbon dioxide recovery device shown in FIG. 1, it is a diagram schematically showing a state in which a scraping member is in a standby position with a part broken away. FIG. 2 is a diagram schematically showing a state in which the scraping member is positioned between a standby position and a drive position in a partially broken state in the carbon dioxide recovery apparatus shown in FIG. 1. FIG. 2 is a diagram schematically showing a state in which the scraping member is in a driving position with a part broken away in the carbon dioxide recovery device shown in FIG. 1. It is a figure which shows the other example of the scraping member used with this carbon dioxide recovery apparatus.

  Hereinafter, a preferred embodiment of the carbon dioxide recovery device of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the carbon dioxide recovery apparatus 10 of the present invention.
The carbon dioxide recovery device 10 is used in, for example, a thermal power plant that uses coal, petroleum, LNG, or the like as a fuel, and solidifies and recovers carbon dioxide contained in exhaust gas from the thermal power plant.

  The carbon dioxide recovery device 10 includes a recovery device main body 11, a heat transfer tube 14 disposed inside the recovery device main body 11, a scraping member 17 constituting scraping means, and a driving means for driving the scraping member 17. A drive device 18 as a control device, a control device 30 as a control means for controlling the drive device 18, a switching device 26 as a switching means provided on the bottom side of the recovery device main body 11, and a lower portion of the recovery device main body 11. And an accommodating portion 19 to be provided.

The collection device main body 11 has a cylindrical shape extending along the vertical direction (that is, the collection device main body 11 is arranged so that its height is along the vertical direction).
An exhaust gas introduction pipe 12 is connected to a side surface in the vicinity of the upper end of the recovery apparatus main body 11, and an exhaust gas outlet pipe 13 is connected to a side surface in the vicinity of the lower end of the recovery apparatus main body 11. The exhaust gas introduced into the recovery apparatus main body 11 from the exhaust gas introduction pipe 12 is led out from the exhaust gas outlet pipe 13 as carbon dioxide-removed exhaust gas from which carbon dioxide has been removed (hereinafter simply referred to as removed exhaust gas).

  A plurality of heat transfer tubes 14 are arranged inside the recovery apparatus main body 11. The plurality of heat transfer tubes 14 extend in a substantially vertical direction inside the recovery apparatus main body 11. A refrigerant such as liquid nitrogen circulates inside the heat transfer tube 14. The heat transfer tubes 14 are preferably arranged at equiangular intervals with the central axis of the recovery device body 11 as the center.

  As shown in FIG. 1, the lower end side of the heat transfer tube 14 extends radially outward, passes through the side surface of the recovery device main body 11, and is connected to an annular connecting tube 15. Then, the aforementioned refrigerant is introduced into the heat transfer tube 14 via the connecting tube 15. On the other hand, the upper end side of the heat transfer tube 14 passes through the upper surface of the recovery device main body 11 and is connected to the annular connecting tube 16. And the refrigerant | coolant which distribute | circulates the inside of the heat exchanger tube 14 is derived | led-out via the connection pipe 16. FIG. That is, the refrigerant flows through the connecting pipe 15, the heat transfer pipe 14, and the connecting pipe 16, and again at a predetermined temperature (for example, −110 ° C. to −120 ° C .: this temperature is generated by carbon dioxide) in a cooling device (not shown). It is cooled to a temperature at which it becomes solidified and becomes dry ice), and is again introduced into the heat transfer tube 14 from the connecting tube 15.

  The scraping member 17 is a circular plate-like member having substantially the same shape as the horizontal sectional shape of the recovery apparatus main body 11. The scraping member 17 is formed with a plurality of heat transfer tube insertion holes 20 through which the plurality of heat transfer tubes 14 are inserted, and a plurality of gas flow holes 21 through which the exhaust gas introduced into the recovery device main body 11 flows. Has been. An appropriate clearance (for example, 1 mm to 3 mm) is formed between the inner peripheral surface of the plurality of heat transfer tube insertion holes 20 and the outer peripheral surface of the heat transfer tube 14. That is, the inner peripheral surfaces of the plurality of heat transfer tube insertion holes 20 are arranged close to the outer peripheral surface of the heat transfer tube 14. The plurality of gas flow holes 21 are provided at substantially equal intervals on a substantially concentric circle from the center of the scraping member 17.

  The driving device 18 drives the scraping member 17 along the vertical direction. The drive device 18 includes a cylinder 22 and a piston 23 slidably accommodated in the cylinder 22. The cylinder 22 is disposed so as to penetrate the upper surface of the recovery apparatus main body 11. The tip end side of the piston 23 is connected to the scraping member 17. According to this drive device 18, when fluid is supplied into the cylinder 22, the piston 23 moves downward in the vertical direction. As a result, the scraping member 17 moves downward in the vertical direction. When the fluid is discharged from the cylinder 22, the piston 23 moves upward in the vertical direction. As a result, the scraping member 17 moves upward in the vertical direction.

  The accommodating part 19 includes a plurality of accommodating containers 24 and 25. The storage containers 24 and 25 store the solidified carbon dioxide scraped off by the scraping member 17. Each of the storage containers 24 and 25 has airtightness and pressure resistance. The storage containers 24 and 25 are provided with on-off valves 27 and 28, respectively. The carbon dioxide stored in the storage containers 24 and 25 by the opening and closing operation of these on-off valves 27 and 28 is led out through the piping.

  The switching device 26 selectively supplies the solidified carbon dioxide scraped off by the scraping member 17 to a predetermined storage container among the plurality of storage containers 24, 25.

The control device 30 controls the drive device 18 so that the scraping member 17 is placed on the upper standby position A (see FIG. 2) of the recovery device main body 11 and the drive position B located below the standby position A. (See FIG. 4).
In addition, the control device 30 controls the driving device 18 to move the scraping member 17 at a predetermined time interval, and after driving the scraping member 17 from the standby position to the driving position, the scraping member immediately. 17 is returned from the drive position to the standby position.

Next, the operation of the carbon dioxide recovery apparatus 10 of the present embodiment will be described with reference to FIGS.
First, the driving device 18 is driven, and the scraping member 17 is positioned at a standby position A that is a predetermined position slightly below the attachment position of the exhaust gas introduction pipe 12.
In this state, exhaust gas containing carbon dioxide is supplied into the recovery apparatus main body 11 through the exhaust gas introduction pipe 12. The carbon dioxide contained in the exhaust gas introduced into the inside of the recovery apparatus main body 11 is cooled by the refrigerant circulating in the heat transfer tube 14, solidifies on the surface of the heat transfer tube 14, and adheres as dry ice (FIG. 2). reference). The removed exhaust gas from which carbon dioxide has been removed is discharged to the outside through the exhaust gas outlet pipe 13.

The control device 30 drives and controls the drive device 18 at a preset time interval. That is, the control device 30 supplies fluid into the cylinder 22 and moves the piston 23 downward in the vertical direction. As a result, the scraping member 17 moves downward in the vertical direction to the drive position B (see FIGS. 3 and 4). Here, since the inner peripheral surface of the heat transfer tube insertion hole 20 is located on the surface side of the heat transfer tube 14 with an appropriate clearance, the dry ice attached to the surface of the heat transfer tube 14 is scraped off by the scraping member 17. Due to the downward movement, it is scraped off from the surface of the heat transfer tube 14 and falls downward.
Further, when the scraping member 17 reaches the drive position B, the control device 30 immediately discharges the fluid from the cylinder 22 and moves the piston 23 upward in the vertical direction. As a result, the scraping member 17 moves upward in the vertical direction and returns to the standby position A. Here, when the scraping member 17 reaches the driving position B, the control device 30 immediately returns the scraping member 17 to the standby position A. Therefore, when the scraping member 17 returns from the driving position B to the standby position A, The dry ice does not adhere to the surface of the heat transfer tube 14.

  The control device 30 has a built-in timer (not shown), and causes the drive device 18 to execute the above-described processing at predetermined time intervals.

  The dry ice that has fallen to the bottom surface side of the recovery device main body 11 reaches the switching device 26 and is distributed to the storage container 24 or 25 here. For example, according to the amount of dry ice stored in the storage containers 24 and 25, the switching device 26 supplies the dry ice to the storage containers 24 or 25, and the amount of dry ice stored in the storage containers 24 and 25 is reduced. Avoid unevenness.

  The storage containers 24 and 25 are constituted by containers having airtightness and pressure resistance. Thereby, the dry ice accommodated in the storage containers 24 and 25 is stored in a state of liquid carbon dioxide due to the temperature rise inside the storage containers 24 and 25.

  According to the carbon dioxide recovery device 10 described above, the following effects can be obtained.

  The carbon dioxide contained in the exhaust gas is attached to the surface of the heat transfer tube 14 as dry ice, and the scraping member is moved along the heat transfer tube 14 to scrape and store the dry ice attached to the surface of the heat transfer tube 14. The containers 24 and 25 were collected. Thereby, since the carbon dioxide can be recovered without applying vibration to the recovery device main body 11, the recovery device main body 11 is not fatigued. That is, the airtightness of the recovery apparatus main body 11 is not impaired by fatigue, and the exhaust gas does not leak from the recovery apparatus main body 11. As a result, carbon dioxide can always be efficiently recovered.

  Further, a gas flow hole 21 was formed in the scraping member 17. Thereby, when the scraping member 17 moves in the vertical direction using the heat transfer tube 14 as a guide, the exhaust gas introduced into the recovery apparatus main body 11 flows through the gas flow hole 21. Therefore, the movement of the scraping member 17 is not impaired by the exhaust gas introduced into the recovery apparatus main body 11.

  In addition, the storage containers 24 and 25 are constituted by containers having airtightness and pressure resistance. Thereby, the dry ice accommodated in the storage containers 24 and 25 is stored in a state of liquid carbon dioxide due to the temperature rise inside the storage containers 24 and 25. Therefore, since the recovered carbon dioxide can be easily transferred by piping, the liquid carbon dioxide can be used as a refrigerant separately.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

  For example, in the present embodiment, a disc-shaped member is used as the scraping member 17, but the scraping member 17 is not limited to this, and effectively scrapes dry ice adhering to the surface of the heat transfer tube 14. Other shapes are possible as long as they can be used.

  That is, as shown in FIG. 5, the scraping member 17 has a plurality of pipe bodies 17a, and each of the heat transfer tubes 14 is inserted into the pipe body 17a on a one-to-one basis. The scraping member 17 includes, for example, a connecting body (small disc shape) 17b positioned on the central axis of the recovery apparatus main body 11, and the pipe bodies 17a are connected to the connecting body 17b by link members 17c, respectively. And the front-end | tip of piston 23 is connected with the connection body 17b, the drive body 18 moves the connection body 17b, ie, the pipe body 17a, in the vertical direction, and scrapes off the dry ice adhering to the surface of the heat exchanger tube 14.

  Moreover, in this embodiment, although the drive device 18 was comprised with the cylinder 22 and the piston, it is not restricted to this. That is, the drive device 18 may be configured by a magnet disposed on the outer peripheral surface of the collection device main body 11. In this case, the scraping member is made of a magnetic member, and the scraping member can be moved by moving the magnet disposed on the outer peripheral surface in the vertical direction.

  In the present embodiment, an appropriate clearance is formed between the inner peripheral surface of the plurality of heat transfer tube insertion holes 20 and the outer peripheral surface of the heat transfer tube 14, but the present invention is not limited to this. That is, you may contact the inner peripheral surface of a some heat exchanger tube penetration hole, and the outer peripheral surface of a heat exchanger tube. In this case, by constituting the inner peripheral surface of the heat transfer tube insertion hole with an elastic member such as rubber, the heat transfer tube or the scraping member can be prevented from being damaged due to the contact between the heat transfer tube and the heat transfer tube insertion hole.

DESCRIPTION OF SYMBOLS 10 Carbon dioxide recovery apparatus 11 Recovery apparatus main body 12 Exhaust gas inlet pipe 13 Exhaust gas outlet pipe 14 Heat transfer pipe 15, 16 Connecting pipe 17 Scraping member 18 Drive device 19 Housing part 20 Heat transfer pipe insertion hole 21 Gas flow hole 22 Cylinder 23 Piston 24, 25 Container 26 Switching device 27, 28 On-off valve

Claims (6)

A carbon dioxide recovery device for solidifying and recovering carbon dioxide contained in gas,
A recovery device main body configured in a cylindrical shape and arranged so that the height direction is along the vertical direction, and the gas is introduced,
A heat transfer tube disposed in the recovery device main body so as to extend in a substantially vertical direction, and in which a refrigerant flows;
Scraping means for scraping off the solidified carbon dioxide adhering to the peripheral surface of the heat transfer tube;
A storage section for storing solidified carbon dioxide that is disposed below the recovery apparatus main body and scraped off by the scraping means ;
The scraping means is a scraping member that is movable in the vertical direction in the vicinity of the peripheral surface of the heat transfer tube;
Drive means for driving the scraping member in a vertical direction,
The scraping member is constituted by a plate-like member having substantially the same cross-sectional shape in the horizontal direction in the recovery device body, and the plate-like member has a heat transfer tube insertion hole through which the heat transfer tube is inserted and the recovery device body. A carbon dioxide recovery device in which a gas circulation hole through which a gas introduced into the gas flows is formed . Said drive means, according to claim 1 comprising a cylinder disposed through the upper surface of the collection device main body, a piston slidably accommodated in the distal end side in the cylinder is connected to the dumping member scraping said, the Carbon dioxide recovery equipment. The container is composed of a plurality of containers.
The recovery device on the bottom side of the body, the carbon dioxide recovery apparatus according to claim 1 or 2 switching means is provided for supplying carbon dioxide solidified in a predetermined container of the plurality of container. The carbon dioxide recovery device according to claim 3 , wherein each of the plurality of storage containers is configured by a container having airtightness and pressure resistance. Claim 1 or further comprising a control means for controlling said drive means to move between a driving position located below the predetermined standby position and該待machine position in the collecting device body the scraper 2. The carbon dioxide recovery device according to 2. The control means moves the scraping member at a predetermined time interval, drives the scraping member from the standby position to the driving position, and immediately moves the scraping member from the driving position to the standby position. The carbon dioxide recovery device according to claim 5, wherein the drive means is controlled to return to the normal state.

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