JP5518531B2 - 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) A carbon dioxide recovery device of the present invention is a carbon dioxide recovery device that solidifies and recovers carbon dioxide contained in exhaust gas, the recovery device main body through which exhaust gas flows, and the interior of the recovery device main body And a solidified carbon dioxide that is disposed in the vicinity of the heat transfer tube and that moves in the horizontal direction and adheres to the peripheral surface of the heat transfer tube. Scraping means for scraping off the carbon dioxide, and a storage section for storing carbon dioxide scraped off by the scraping means disposed below the recovery apparatus main body.

  (2) The heat transfer tube includes a first heat transfer tube disposed at a lower portion in the height direction of the recovery device main body, and a second heat transfer tube disposed at an upper portion than the first heat transfer tube, The flow direction of the refrigerant in the first heat transfer tube is preferably opposite to the flow direction of the refrigerant in the second heat transfer tube.

  (3) a first state in which the refrigerant flows in the first direction in the first heat transfer tube, and the refrigerant flows in a second direction opposite to the first direction in the second heat transfer tube; It is preferable that flow path switching means for switching between the second state in which the refrigerant is circulated in the second direction in the first heat transfer tube and the refrigerant is circulated in the first direction in the second heat transfer tube is further provided. .

  (4) The recovery device body includes an exhaust gas introduction port provided at an upper portion of the recovery device body and into which exhaust gas is introduced, a first exhaust gas circulation chamber that allows the exhaust gas introduced from the exhaust gas introduction port to flow downward, A second exhaust gas circulation chamber continuously provided in a lower portion of the first exhaust gas circulation chamber and allowing the exhaust gas flowing through the first exhaust gas circulation chamber to flow upward; and the second exhaust gas circulation chamber provided in an upper portion of the second exhaust gas circulation chamber. It is preferable to include an exhaust gas discharge port for discharging the exhaust gas flowing through the exhaust gas circulation chamber.

  (5) It is preferable that the heat transfer tube and the scraping means are provided in the first exhaust gas circulation chamber.

  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 mimetic diagram explaining a carbon dioxide recovery device concerning an embodiment of the present invention. It is a perspective view which shows the collection | recovery apparatus main body which concerns on embodiment of this invention. It is a top view which shows the heat exchanger tube which concerns on embodiment of this invention. It is a front view which shows the scraping member which concerns on embodiment of this invention. It is a side view which shows the scraping member and drive part which concern on embodiment of this invention. It is a figure which shows partially the state which the scraping member in the carbon dioxide collection device shown in FIG. FIG. 2 is a diagram schematically showing a state in which a scraping member in the carbon dioxide recovery device shown in FIG. 1 is located between a standby position and a drive position, with a part broken away. FIG. 2 is a diagram schematically showing a state in which a scraping member in the carbon dioxide recovery device shown in FIG.

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

  As shown in FIG. 1, the carbon dioxide recovery device 1 is used in, for example, a thermal power plant that uses coal, petroleum, LNG, or the like as a fuel, and solidifies carbon dioxide contained in exhaust gas from the thermal power plant. to recover.

  The carbon dioxide recovery device 1 includes a recovery device main body 10, a heat transfer tube 20 disposed inside the recovery device main body 10, a refrigerant circulation portion 24 through which a refrigerant flows, and a peripheral surface of the heat transfer tube 20. Scraping means 30 for scraping off the solidified carbon dioxide (dry ice), flow path switching means 40 (see FIG. 2) for switching the flow path of the refrigerant flowing through the heat transfer tube 20, and dry ice that has been scraped off The recovery part 50 to collect | recover, the accommodating part 60 arrange | positioned under the collection | recovery apparatus main body 10, the pump 70 which adjusts the pressure of the collection | recovery part 50 and the accommodating part 60, and the control apparatus 80 are provided.

As shown in FIG. 2, the recovery apparatus main body 10 includes an exhaust gas introduction port 11, a first exhaust gas circulation chamber 12, a second exhaust gas circulation chamber 14, and an exhaust gas discharge port 13, and the exhaust gas circulates therein. .
The exhaust gas inlet 11 is provided in the upper part of the recovery apparatus main body 10. Exhaust gas is introduced into the recovery apparatus main body 10 from the exhaust gas inlet 11.
The first exhaust gas circulation chamber 12 extends downward from the exhaust gas inlet 11. In the first exhaust gas circulation chamber 12, the exhaust gas introduced from the exhaust gas inlet 11 circulates from above to below.
The second exhaust gas circulation chamber 14 is provided continuously below the first exhaust gas circulation chamber 12. The second exhaust gas circulation chamber 14 is formed extending upward. In the second exhaust gas circulation chamber 14, the exhaust gas that has circulated through the first exhaust gas circulation chamber 12 circulates from below to above.
The exhaust gas discharge port 13 is provided in the upper part of the second exhaust gas circulation chamber 14. From the exhaust gas discharge port 13, the exhaust gas flowing through the second exhaust gas circulation chamber 14 is discharged. The exhaust gas discharge port 13 is disposed at a position lower than the exhaust gas introduction port 11.

  The recovery apparatus main body 10 is narrowed so that the area of the cross section in the horizontal direction gradually decreases downward in a portion where the first exhaust gas circulation chamber 12 and the second exhaust gas circulation chamber 14 are continuous. That is, the wall surface of the recovery apparatus body 10 at the portion where the first exhaust gas circulation chamber 12 and the second exhaust gas circulation chamber 14 are continuous is an inclined surface that is inclined downward toward the center of the cross section of the recovery apparatus body 10 in the horizontal direction. Thus, a projecting portion 16 projecting downward is formed. The protrusion 16 is provided with an opening. The volume of the first exhaust gas circulation chamber 12 is larger than the volume of the second exhaust gas circulation chamber 14, and the opening provided in the recovery device body 10 is located on the first exhaust gas circulation chamber 12 side.

  The refrigerant circulation part 24 includes a first refrigerant circulation part 24a through which the refrigerant is circulated substantially horizontally, and a second refrigerant circulation part 24b disposed above the first refrigerant circulation part and substantially in parallel with the first refrigerant circulation part. And a pair of connecting parts 24c that connect the first refrigerant circulation part 24a and the second refrigerant circulation part 24b. The refrigerant circulation part 24 is disposed so as to extend in the horizontal direction inside the recovery apparatus main body 10 and has a heat transfer tube 20 through which the refrigerant circulates. A refrigerant such as liquid nitrogen circulates inside the heat transfer tube 20.

  As shown in FIGS. 2 and 3, the first refrigerant flow portion 24 a is substantially perpendicular to the direction in which the plurality of first heat transfer tubes 21 extending substantially parallel to each other and the plurality of first heat transfer tubes 21 extend. A first connection pipe 241 connected to one end side of each of the plurality of first heat transfer pipes 21 and connected to the other end side of each of the plurality of first connection pipes 241 extending substantially parallel to the first connection pipe 241. The second connecting pipe 242, the one end side being connected to the first connecting pipe 241, the other end side being connected to the second connecting pipe 242, and the one end side being connected to the third connecting pipe 243. 4 connecting pipes 244.

  The plurality of first heat transfer tubes 21 are disposed through the first exhaust gas circulation chamber 12. Most of the plurality of first heat transfer tubes 21 are located inside the first exhaust gas circulation chamber 12. One end side and the other end side of the plurality of first heat transfer tubes 21 are located outside the first exhaust gas circulation chamber 12.

The first connection pipe 241 is disposed outside the first exhaust gas circulation chamber 12. One end side of each of the plurality of first heat transfer tubes 21 is connected to the first connection tube 241 at a predetermined interval in the longitudinal direction.
The second connection pipe 242 is disposed outside the first exhaust gas circulation chamber 12. The other end side of each of the plurality of first heat transfer tubes 21 is connected to the second connection tube 242 at a predetermined interval in the longitudinal direction.

The third connection pipe 243 is disposed outside the first exhaust gas circulation chamber 12. The third connection pipe 243 is disposed along the side surface of the first exhaust gas circulation chamber 12. One end side of the third connecting pipe 243 is connected to a substantially central part in the longitudinal direction of the first connecting pipe 241, and the other end side of the third connecting pipe 243 is connected to a substantially central part in the longitudinal direction of the second connecting pipe 242. Connected.
The fourth connecting pipe 244 is connected to the substantially central portion of the third connecting pipe 243 in the longitudinal direction.

  The second refrigerant circulation part 24b extends substantially perpendicular to the extending direction of the plurality of second heat transfer tubes 22 and the plurality of second heat transfer tubes 22 in the heat transfer tubes 20, and the plurality of second heat transfer tubes 22. A fifth connection pipe 245 connected to one end side of each, a sixth connection pipe 246 extending substantially parallel to the fifth connection pipe 245 and connected to the other end side of each of the plurality of second heat transfer pipes 22, and one end side thereof A seventh connecting pipe 247 connected to the fifth connecting pipe 245 and having the other end connected to the sixth connecting pipe 246; and an eighth connecting pipe 248 connected to the seventh connecting pipe 247 at one end.

  The plurality of second heat transfer tubes 22 are disposed above the first heat transfer tubes 21. The plurality of second heat transfer tubes 22 are arranged through the first exhaust gas circulation chamber 12 so as to extend along the direction in which the plurality of first heat transfer tubes 21 extend. Most of the plurality of second heat transfer tubes 22 are located inside the first exhaust gas circulation chamber 12. One end side and the other end side of the plurality of second heat transfer tubes 22 are located outside the first exhaust gas circulation chamber 12.

The fifth connection pipe 245 is disposed outside the first exhaust gas circulation chamber 12. One end side of each of the plurality of second heat transfer tubes 22 is connected to the fifth connection tube 245 at a predetermined interval in the longitudinal direction.
The sixth connection pipe 246 is disposed outside the first exhaust gas circulation chamber 12. The other end side of each of the plurality of second heat transfer tubes 22 is connected to the sixth connection tube 246 at a predetermined interval in the longitudinal direction.

The seventh connection pipe 247 is disposed outside the first exhaust gas circulation chamber 12. The seventh connection pipe 247 is disposed along the side surface of the first exhaust gas circulation chamber 12. One end side of the seventh connection pipe 247 is connected to a substantially central part in the longitudinal direction of the fifth connection pipe 245, and the other end side of the seventh connection pipe 247 is connected to a substantially central part in the longitudinal direction of the sixth connection pipe 246. Connected.
The eighth connecting pipe 248 is connected to the substantially central portion of the seventh connecting pipe 247 in the longitudinal direction.

  The pair of connecting portions 24c includes a ninth connecting pipe 249 that connects the first connecting pipe 241 and the fifth connecting pipe 245, and a tenth connecting pipe 250 that connects the second connecting pipe 242 and the sixth connecting pipe 246. Composed. The ninth connecting tube 249 connects the substantially central portion of the first connecting tube 241 in the longitudinal direction and the substantially central portion of the fifth connecting tube 245 in the longitudinal direction. The tenth connecting pipe 250 connects the substantially central part in the longitudinal direction of the second connecting pipe 242 and the substantially central part in the longitudinal direction of the sixth connecting pipe 246.

  In the refrigerant circulation part 24 described above, the refrigerant is introduced from the fourth connecting pipe 244 to the first refrigerant circulation part 24a. The refrigerant that has flowed through the first refrigerant flow portion 24a flows into the second refrigerant flow portion 24b through the connecting portion 24c. And the refrigerant | coolant which distribute | circulated the 2nd refrigerant | coolant distribution | circulation part 24b is derived | led-out from the 8th connection pipe 248. FIG.

  The flow path switching means 40 switches the flow path of the refrigerant that flows through the refrigerant flow section 24. The flow path switching means 40 includes a first control valve 41 provided on the first connection pipe 241 side of the third connection pipe 243 and a first control valve 41 provided on the second connection pipe 242 side of the third connection pipe 243. A third control valve 43 provided on the fifth connection pipe 245 side of the seventh connection pipe 247, a fourth control valve 44 provided on the sixth connection pipe 246 side of the seventh connection pipe 247, and a ninth connection pipe And a sixth control valve 45 provided in the tenth connecting pipe 250.

  The flow path switching unit 40 switches the refrigerant flow direction in the first heat transfer tube 21 and the refrigerant flow direction in the second heat transfer tube 22 to be in opposite directions. The flow path switching means 40 causes the refrigerant to flow in the first direction (the direction of arrow A in FIG. 2) in the first heat transfer tube 21 and in the second heat transfer tube 22, the refrigerant is in a second direction opposite to the first direction. And the second state in which the refrigerant is circulated in the second direction in the first heat transfer tube 21 and the refrigerant is circulated in the first direction in the second heat transfer tube 22.

  More specifically, when circulating the refrigerant in the first state, the second control valve 42 is opened and the first control valve 41 is closed. Thereby, the refrigerant introduced from the fourth connecting pipe 244 flows through the third connecting pipe 243 to the second connecting pipe 242 side, and the plurality of first heat transfer pipes 21 from the second connecting pipe 242 side to the first connecting pipe. It circulates to the 241 side. Since the first control valve 41 is closed, the refrigerant circulated to the first connecting pipe 241 side passes through the ninth connecting pipe 249 to the plurality of second heat transfer pipes 22. The refrigerant flows from the fifth connecting pipe 245 side of the plurality of second heat transfer pipes 22 to the sixth connecting pipe 246 side. The refrigerant that has flowed to the sixth connecting pipe 246 side flows through the seventh connecting pipe 247, and since the third control valve 43 is closed, the refrigerant does not flow to the fifth connecting pipe 245 side, but passes through the eighth connecting pipe 248. Distributed and derived.

  Moreover, when circulating a refrigerant | coolant in a 2nd state, while opening the 1st control valve 41, the 2nd control valve 42 valve is closed. Thereby, the refrigerant introduced from the fourth connection pipe 244 flows through the third connection pipe 243 to the first connection pipe 241 side, and the plurality of first heat transfer pipes 21 from the first connection pipe 241 side to the second connection pipe. It distributes to the 242 side. The refrigerant circulated to the second connecting pipe 242 side passes through the tenth connecting pipe 250 to the plurality of second heat transfer pipes 22 because the second control valve 42 is closed. The refrigerant flows from the sixth connecting pipe 246 side to the fifth connecting pipe 245 side of the plurality of second heat transfer tubes 22. The refrigerant that has flowed to the fifth connecting pipe 245 side flows through the seventh connecting pipe 247, and since the fourth control valve 44 is closed, the refrigerant does not flow to the sixth connecting pipe 246 side, but passes through the eighth connecting pipe 248. Distributed and derived.

  As shown in FIGS. 4 and 5, the scraping means 30 is a substantially rectangular plate-shaped scraping member 31 disposed inside the first exhaust gas circulation chamber 12 and a drive for moving the scraping member 31 in the horizontal direction. Drive device 32 as a unit. The scraping means 30 is disposed in the vicinity of the peripheral surface of the heat transfer tube 20, moves in the horizontal direction, and scrapes off solidified carbon dioxide (dry ice) attached to the peripheral surface of the heat transfer tube 20.

  The scraping member 31 is disposed such that its plate surface is orthogonal to the direction in which the heat transfer tube 20 extends, and the thickness direction of the plate surface is along the vertical direction. The scraping member 31 is formed with a plurality of heat transfer tube insertion holes 33 through which the plurality of heat transfer tubes 20 are inserted. 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 33 and the outer peripheral surface of the heat transfer tube 20. That is, the inner peripheral surface of the plurality of heat transfer tube insertion holes 33 is disposed close to the outer peripheral surface of the heat transfer tube 20.

  As shown in FIG. 5, the scraping member 31 includes a pair of first plate-like members 31a and a second plate-like member 31b disposed between the pair of first plate-like members 31a. The pair of first plate members 31a is made of a fluororesin, and the second plate member 31b is made of a stainless steel plate.

  The drive device 32 includes a geared rack portion 34, a pinion portion 35 that meshes with teeth provided in the rack portion 34, and an electric motor 36 that drives them. The rack portion 34 is connected to the center of gravity of the plate surface of the scraping member 31 and extends in a substantially horizontal direction from the plate surface. The pinion part 35 is provided in the electric motor 36 and rotates in a state of being engaged with the teeth of the rack part 34. The electric motor 36 drives the rack portion 34 by rotating the pinion portion 35, thereby driving the scraping member 31 connected to the rack portion 34 in the horizontal direction.

  As shown in FIG. 1, the recovery unit 50 is disposed below the first exhaust gas circulation chamber 12. The recovery unit 50 includes a rotary valve 51 that recovers the dry ice that flows through the first exhaust gas circulation chamber 12 and a pressure reduction plate 52 that is provided above the rotary valve 51 and reduces the pressure applied to the rotary valve 51. A recovery container 53 provided below the rotary valve 51, and a switching device 54 provided between the rotary valve 51 and the recovery container 53 for blocking and opening a pipe for circulating dry ice to the recovery container 53; Is provided.

  The rotary valve 51 is connected to the protruding portion 16 of the recovery apparatus main body 10. An opening is provided above the rotary valve 51. It joins so that the opening provided in the protrusion part 16 of the collection | recovery apparatus main body 10 and the opening part of the rotary valve 51 may fit. Thereby, the dry ice that flows through the first exhaust gas circulation chamber 12 and falls is collected by the rotary valve 51 through the opening of the rotary valve 51.

  The pressure reduction plate 52 has a substantially triangular pyramid shape with the center side bulging, and is provided below the collection apparatus main body 10 and above the rotary valve 51 with a gap from the rotary valve 51. The shape of the cross section in the horizontal direction of the pressure reduction plate 52 is smaller than the shape of the cross section at the position where the pressure reduction plate 52 is provided in the recovery device main body 10, and between the lower wall surface of the recovery device main body 10 and the pressure reduction plate 52. A gap is formed. On the inclined wall surface below the recovery apparatus main body 10, a protrusion protruding inward is provided. The pressure reduction plate 52 is placed on the protrusion and supported by the protrusion. The dry ice is recovered by dropping from the gap formed between the pressure reduction plate 52 and the lower wall surface of the recovery apparatus main body 10 to the opening of the protrusion 16.

  The collection container 53 is provided below the rotary valve 51. The recovery container 53 includes, for example, two pressure resistors 531 through which a steam pipe through which steam flows is passed. The collection container 53 includes an inlet control valve 532 provided above each of the pressure devices 531, that is, on the rotary valve 51 side, and an outlet control valve 533 provided below each of the pressure devices 531. The pressure device 531 is pressurized by adjusting the inside to minus 56.6 ° C. or more and less than 31.1 ° C., which changes the state of carbon dioxide from an individual to a liquid.

  The switching device 54 is a switching damper provided in a pipe for circulating dry ice from the rotary valve 51 to the pressure device 531. When two withstand pressure devices 531 are provided, the piping extends from below the rotary valve 51 and branches toward the respective withstand pressure devices 531. The switching device 54 is provided at a branched portion of the piping, and shuts off or opens the piping according to the temperature and pressure of the pressure device 531 and the amount of liquefied carbon dioxide in the pressure device 531, and the rotary valve 51. The dry ice recovered by the above is guided to an appropriate pressure device 531.

  The storage unit 60 is scraped off by the scraping means 30, and a passage 62 through which the liquefied carbon dioxide flows from the recovery unit 50 to the storage unit 60, a storage container 61 that stores the liquefied carbon dioxide through the passage 62, Is provided. The liquefied carbon dioxide that has passed through the outlet control valve 533 flows through the passage 62 and is stored in the storage container 61. The storage container 61 is composed of a container having a sealing property and a pressure resistance.

  The pump 70 adjusts the pressure of the pressure device 531 and the passage 62. The pump 70 increases the pressure of the pressure device 531 and the passage 62 to, for example, 10 Mpa or more.

  The control device 80 controls the driving device 32 to move the scraping member 31 between one side and the other side in the longitudinal direction of the heat transfer tube 20. Specifically, the control device 80 drives the electric motor 36 to rotate a pinion portion 35 (not shown) provided in the electric motor 36 in a state of being engaged with the teeth of the rack portion 34. As a result, the scraping member 31 connected to the rack portion 34 moves in the horizontal direction.

The control device 80 controls the flow path switching means 40 provided in the refrigerant flow section 24 to switch the direction of the refrigerant flowing through the first heat transfer tube 21 and the second heat transfer tube 22.
Specifically, the control device 80 puts the flow path switching unit 40 in the first state. That is, the control device 80 opens the second control valve 42, the fourth control valve 44, and the fifth control valve 45 while the first control valve 41, the third control valve 43, and the sixth control valve 46 are closed. Put it in a state. And the control apparatus 80 distribute | circulates a refrigerant | coolant to the 1st refrigerant | coolant distribution part 24a from the refrigerant | coolant supply apparatus which is not shown in figure. Then, the refrigerant flows from the fourth connecting pipe 244 to the second connecting pipe 242 side via the opened second control valve 42, and the first heat transfer pipe 21 is connected to the first connecting pipe 242 side from the first connecting pipe 242 side. It circulates to the pipe 241 side. The refrigerant that has flowed to the first connecting pipe 241 side flows through the ninth connecting pipe 249 via the opened fifth control valve 45 and then flows to the plurality of second heat transfer pipes 22. And a refrigerant | coolant distribute | circulates from the 5th connection pipe 245 side of the some 2nd heat exchanger tube 22 to the 6th connection pipe 246 side. The refrigerant that has flowed to the sixth connecting pipe 246 side flows through the seventh connecting pipe 247 and flows out through the eighth connecting pipe 248.

  The control device 80 puts the flow path switching means 40 in the second state. That is, the control device 80 opens the first control valve 41, the third control valve 43, and the sixth control valve 46 while the second control valve 42, the fourth control valve 44, and the fifth control valve 45 are closed. Put it in a state. And the control apparatus 80 distribute | circulates a refrigerant | coolant to the 1st refrigerant | coolant distribution part 24a from the refrigerant | coolant supply apparatus which is not shown in figure. Then, the refrigerant flows from the fourth connecting pipe 244 to the first connecting pipe 241 side via the opened first control valve 41, and the first heat transfer pipe 21 is connected to the second connecting pipe 241 side from the first connecting pipe 241 side. It circulates to the pipe 242 side. The refrigerant that has flowed to the second connecting pipe 242 side flows through the tenth connecting pipe 250 via the opened sixth control valve 46 and then flows to the plurality of second heat transfer pipes 22. The refrigerant flows from the sixth connecting pipe 246 side to the fifth connecting pipe 245 side of the plurality of second heat transfer tubes 22. And the refrigerant | coolant which distribute | circulated to the 5th connection pipe 245 side distribute | circulates the 7th connection pipe 247, distribute | circulates the 8th connection pipe 248, and is derived | led-out.

  The control device 80 has a built-in timer (not shown), and causes the drive device 32 and the flow path switching unit 40 to execute the above-described processing at predetermined time intervals.

  Further, the control device 80 controls the recovery unit 50 to recover the dry ice that flows through the first exhaust gas circulation chamber 12 and falls. Specifically, the control device 80 rotates the rotary valve 51. Then, the control device 80 controls the switching device 54 provided below the rotary valve 51 to block or open the pipe provided between the rotary valve 51 and the pressure device 531. Thus, after the dry ice is collected by the rotary valve 51, it flows through the opened pipe and flows into the pressure device 531 from the inlet control valve 532 provided above the pressure device 531. The pressure device 531 is pressurized with dry ice contained therein.

  In addition, the control device 80 controls the pump 70 to adjust the pressure of the pressure device 531 and the passage 62.

Next, the operation of the carbon dioxide recovery apparatus 1 of the present embodiment will be described with reference to FIGS.
First, the drive device 32 is driven, and the scraping member 31 is positioned at the standby position A (see FIG. 6) on one end side in the longitudinal direction of the heat transfer tube 20.
In this state, exhaust gas containing carbon dioxide is supplied from the exhaust gas inlet 11 into the recovery apparatus main body 10. The carbon dioxide contained in the exhaust gas introduced into the first exhaust gas circulation chamber 12 from the exhaust gas inlet 11 is a refrigerant that circulates inside the heat transfer tube 20 disposed in the horizontal direction inside the first exhaust gas circulation chamber 12. And is solidified on the peripheral surface of the heat transfer tube 20 and adheres as dry ice.

  The control device 80 controls the driving of the driving device 32 at a preset time interval. The control device 80 drives the electric motor 36 to rotate a pinion portion 35 (not shown) provided in the electric motor 36 in a state where the pinion portion 35 is engaged with the teeth of the rack portion 34. As a result, the scraping member 31 connected to the rack portion 34 moves in the horizontal direction (see FIG. 7). As a result, the scraping member 31 moves from the standby position A to the drive position B on the other side in the longitudinal direction of the heat transfer tube 20 (see FIG. 8). Here, since the inner peripheral surface of the heat transfer tube insertion hole 33 is located on the surface side of the heat transfer tube 20 with an appropriate clearance, the dry ice attached to the peripheral surface of the heat transfer tube 20 is scraped off. By the horizontal movement of 31, it is scraped off from the peripheral surface of the heat transfer tube 20 and falls downward.

When the scraping member 31 reaches the drive position B, the control device 80 returns the scraping member 31 to the standby position A.
In addition, since the scraping member 31 is disposed so that the plate surface thereof is orthogonal to the direction in which the heat transfer tube 20 extends, the exhaust gas flows without being blocked by the scraping member 31.

  The control device 80 causes the refrigerant to flow in the first direction in the first heat transfer tube 21, and causes the refrigerant to flow in the second direction opposite to the first direction in the second heat transfer tube 22, and the first state. While the refrigerant is circulated in the second direction in the heat transfer tube 21, the second state in which the refrigerant is circulated in the first direction in the second heat transfer tube 22 is periodically switched. As the refrigerant flows from upstream to downstream, the temperature rises, but the first state and the second state are periodically switched, so the temperature of the refrigerant flowing through the first heat transfer tube 21 and the second heat transfer tube is not biased. .

Specifically, the control device 80 switches the direction of the refrigerant flowing through the first heat transfer tube 21 and the second heat transfer tube 22 by controlling the flow path switching means 40 provided in the refrigerant flow unit 24.
The control device 80 puts the flow path switching means 40 in the first state. That is, the control device 80 opens the second control valve 42, the fourth control valve 44, and the fifth control valve 45 while the first control valve 41, the third control valve 43, and the sixth control valve 46 are closed. The refrigerant is circulated from a refrigerant supply device (not shown) to the first refrigerant circulation part 24a. According to the first state, the refrigerant flows through the first heat transfer tube 21 disposed below in the first direction, flows through the connecting portion 24c, and flows through the second heat transfer tube 22 disposed above in the second direction. Then, it circulates through the second refrigerant circulation part 24b.

  Moreover, the control apparatus 80 makes the flow-path switching means 40 into a 2nd state. That is, the control device 80 opens the first control valve 41, the third control valve 43, and the sixth control valve 46 while the second control valve 42, the fourth control valve 44, and the fifth control valve 45 are closed. The refrigerant is circulated from a refrigerant supply device (not shown) to the first refrigerant circulation part 24a. According to the second state, the refrigerant flows through the first heat transfer tube 21 disposed below in the second direction, flows through the connecting portion 24c, and flows through the second heat transfer tube 22 disposed above in the first direction. Then, it circulates through the second refrigerant circulation part 24b.

  Carbon dioxide is cooled by the heat transfer tube 20, solidified, and removed from the exhaust gas. The removed exhaust gas from which the carbon dioxide has been removed flows from the lower side of the first exhaust gas circulation chamber 12 to the continuous second exhaust gas circulation chamber 14 and flows upward through the second exhaust gas circulation chamber 14. And it is discharged | emitted from the waste gas exhaust port 13 provided above the 2nd waste gas circulation chamber 14. FIG. Since dry ice has a high specific gravity, the dry ice does not circulate upward in the second exhaust gas circulation chamber 14 and falls to the opening of the projecting portion 16 provided below the first exhaust gas circulation chamber 12.

The control device 80 rotates the rotary valve 51 of the recovery unit 50 while the exhaust gas flows through the first exhaust gas circulation chamber 12. For this reason, the dry ice that has fallen into the opening of the protrusion 16 is collected from the upper opening of the rotary valve 51 connected to the opening of the protrusion 16.
A pressure reducing plate 52 is disposed above the rotary valve 51. For this reason, a part of the dry ice scraped off from the peripheral surface of the heat transfer tube 20 is received by the pressure reduction plate 52. The pressure reduction plate 52 reduces the load applied to the rotary valve 51 by the fallen dry ice.

  The dry ice is collected by the rotary valve 51 and then flows into the collection container 53. In the recovery container 53, for example, two pressure devices 531 are provided. A switching device 54 is provided in a pipe for sending the dry ice collected by the rotary valve 51 to the pressure device 531. The control device 80 causes the switching device 54 to shut off or open the pipe according to the temperature of each of the pressure devices 531, the amount of carbon dioxide already stored in the pressure device 531, and the like. The recovered dry ice flows through the piping opened by the switching device 54 and then flows to the pressure device 531.

  The dry ice circulates in the pressure device 531 through an inlet control valve 532 provided above the pressure device 531. Inside the pressure device 531, a pipe through which steam flows is provided. The dry ice is pressurized by the pressure device 531 and changes to a liquid state. The carbon dioxide that has become liquid is discharged from an outlet control valve 533 provided below the pressure device 531, flows through the passage 62, and is stored in the storage container 61 in the storage unit 60.

  According to the carbon dioxide recovery device 1 described above, the following effects can be obtained.

  The carbon dioxide contained in the exhaust gas is attached to the peripheral surface of the heat transfer tube 20 as dry ice, the scraping member 31 is moved along the heat transfer tube 20, and the dry ice attached to the peripheral surface of the heat transfer tube 20 is scraped. It was scraped off by the dropping means and accommodated in the accommodating portion 60. Thereby, since the carbon dioxide can be recovered without applying vibration to the recovery device main body 10, the recovery device main body 10 is not fatigued. That is, the airtightness of the recovery apparatus body 10 is not impaired by fatigue, and the exhaust gas does not leak from the recovery apparatus body 10. As a result, carbon dioxide can always be efficiently recovered.

The heat transfer tube 20 was arranged to extend in the horizontal direction, and the scraping means 30 was moved in the horizontal direction. Considering inspection and repair at a high place when the scraping means 30 is moved in the vertical direction, maintenance such as repair and inspection of the scraping means 30 becomes easy. The scraping means 30 is driven by an electric motor 36 constituted by a rack part 34 and a pinion part 35. For this reason, even if the scraping means 30 is enlarged, stable driving with high driving torque is possible.
Further, the scraper member 31 is disposed so that the plate surface is orthogonal to the direction in which the heat transfer tube 20 extends, and the thickness direction of the plate is directed in the vertical direction. For this reason, the exhaust gas introduced from the upper part of the first exhaust gas circulation chamber 12 is not blocked by the plate surface of the scraping member 31, and the scraping member 31 has little influence on the exhaust gas circulation.

  A first state in which the flow path switching means 40 causes the refrigerant to flow in the first direction in the first heat transfer tube 21 and causes the refrigerant to flow in the second direction opposite to the first direction in the second heat transfer tube 22; The first heat transfer tube 21 was switched between the second state in which the refrigerant was circulated in the second direction and the second heat transfer tube 22 was circulated in the first direction. The temperature of the refrigerant on the upstream side near the refrigerant supply device is low, and the temperature rises as it flows downstream. However, the first heat transfer tube 21 and the second heat transfer tube 22 are arranged above the first heat transfer tube 21 and are periodically switched so that the directions of the refrigerant flowing through these tubes are opposite to each other. For this reason, the dry ice is not biased toward the first heat transfer tube 21 and the second heat transfer tube 22 without the temperature being lowered due to the bias toward either one of the first heat transfer tube 21 and the second heat transfer tube 22. Does not adhere.

  Further, an exhaust gas inlet 11 is provided above the recovery apparatus body 10 in the vertical direction, and is continuously provided in the first exhaust gas circulation chamber 12 through which the exhaust gas introduced from the exhaust gas inlet 11 circulates. The second exhaust gas circulation chamber 14 for circulating the exhaust gas flowing through the first exhaust gas circulation chamber 12 upward, and the exhaust gas that has been continuously provided below the first exhaust gas circulation chamber 12 and circulated through the first exhaust gas circulation chamber 12 The second exhaust gas circulation chamber 14 to be circulated upward and the second exhaust gas circulation chamber 14 are disposed at a position above the portion where the second exhaust gas circulation chamber 14 and the first exhaust gas circulation chamber 12 are continuous. 1, an exhaust gas discharge port 13 for discharging the exhaust gas flowing through the exhaust gas circulation chamber 12 was provided. Since dry ice has a high specific gravity, it falls downward, but the exhaust gas from which carbon dioxide has been removed flows through the second exhaust gas circulation chamber 14 and is discharged from the upper exhaust gas outlet 13. For this reason, it is prevented that the dry ice scraped off by the scraping member 31 is mixed into the removed exhaust gas or scattered.

  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 this embodiment, the heat transfer tube 20 includes a plurality of first heat transfer tubes 21 disposed in the lower portion and a plurality of second heat transfer tubes 22 disposed in the upper portion, and is disposed in two stages. Not limited to. Any number of heat transfer tubes adjacent in the vertical direction may be arranged as long as the refrigerant can circulate in opposite directions.

  In the present embodiment, a substantially rectangular member is used as the scraping member 31, but the scraping member 31 is not limited to this, and the dry ice attached to the peripheral surface of the heat transfer tube 20 is effectively scraped. Other shapes may be used as long as they can be dropped.

  Moreover, in this embodiment, although the moderate clearance was formed between the internal peripheral surface of the some heat exchanger tube penetration hole 33, and the outer peripheral surface of the heat exchanger tube 20, it is not restricted 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 1 Carbon dioxide recovery apparatus 10 Recovery apparatus main body 11 Exhaust gas inlet 12 First exhaust gas circulation chamber 13 Exhaust gas outlet 14 Second exhaust gas circulation chamber 20 Heat transfer tube 21 First heat transfer tube 22 Second heat transfer tube 30 Scraping means 40 Flow path switching Means 60 Housing

Claims (3)

A carbon dioxide recovery device that solidifies and recovers carbon dioxide contained in exhaust gas,
A recovery device body through which exhaust gas circulates;
A heat transfer tube disposed in the recovery device main body so as to extend in the horizontal direction, and through which the refrigerant flows;
Scraping means arranged in the vicinity of the heat transfer tube, moving horizontally and scraping off the solidified carbon dioxide adhering to the peripheral surface of the heat transfer tube;
A storage unit that is disposed below the recovery device body and stores carbon dioxide scraped off by the scraping means ; and
The heat transfer tube includes a first heat transfer tube disposed at a lower portion in the height direction of the recovery device main body, and a second heat transfer tube disposed at an upper portion than the first heat transfer tube,
The flow direction of the refrigerant in the first heat transfer tube is opposite to the flow direction of the refrigerant in the second heat transfer tube,
A first state in which the refrigerant is circulated in the first direction in the first heat transfer tube, and the refrigerant is circulated in a second direction opposite to the first direction in the second heat transfer tube;
With circulating the coolant in the second direction in the first heat transfer tubes, further Ru comprising a flow passage switching means for switching, and a second state for circulating the refrigerant in the first direction in the second heat transfer tube dioxide Carbon recovery device. The recovery device main body is provided at an upper portion of the recovery device main body, and an exhaust gas inlet for introducing exhaust gas;
A first exhaust gas circulation chamber for circulating the exhaust gas introduced from the exhaust gas inlet;
A second exhaust gas circulation chamber which is continuously provided at a lower portion of the first exhaust gas circulation chamber and allows the exhaust gas flowing through the first exhaust gas circulation chamber to circulate upward;
Carbon dioxide recovery apparatus according to claim 1 and a gas discharge port for discharging the exhaust gas flowing through the second exhaust gas flow chamber provided in an upper portion of the second exhaust gas flow chamber. The carbon dioxide recovery apparatus according to claim 2 , wherein the heat transfer tube and the scraping means are disposed in the first exhaust gas circulation chamber.

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