JP5715697B2 - Carbon dioxide supply and recovery device for supercritical carbon dioxide gas turbine and method for adjusting carbon dioxide filling amount - Google Patents

Description

  The present invention relates to a carbon dioxide supply and recovery device for a supercritical carbon dioxide gas turbine and a carbon dioxide enclosure amount adjusting method. More specifically, in a closed cycle gas turbine using supercritical carbon dioxide as a working fluid, a device for adjusting the amount of carbon dioxide enclosed in the cycle as the working fluid, and the amount of carbon dioxide enclosed using this device. It is about the method of adjusting.

  From the viewpoint of fuel diversification and energy saving, development of a closed cycle gas turbine (external combustion engine) using carbon dioxide as a working medium is underway. A gas turbine using supercritical carbon dioxide as a working fluid can be expected as a highly efficient power generation system by reducing compressor power, and can use various fuels and exhaust heat because it is a closed cycle.

  However, if the amount of carbon dioxide necessary for the operating state is enclosed in the closed cycle from the beginning, the gas and liquid are separated into two phases at the time of turbine startup when the temperature of the equipment and piping is low. If supplied, the compressor may be damaged. Even during operation, the cycle characteristics vary depending on the amount of carbon dioxide that is the working medium. Therefore, there is a need for means for flexibly adjusting the amount of carbon dioxide enclosed in the cycle.

JP 2006-96635 A

  When supplying carbon dioxide to a high-pressure cycle, a method of pushing liquefied carbon dioxide into the cycle using a high-pressure pump as described in Patent Document 1 may be employed. However, in this case, it is necessary to operate the pump under conditions where carbon dioxide does not vaporize, and in a pump including a drive portion, carbon dioxide may leak from the seal portion.

  In addition, carbon dioxide can be heated to increase the pressure in the reserve tank, and carbon dioxide can be supplied to the cycle from the high-pressure reserve tank. However, it cannot be recovered without going through a process of cooling and decompression.

  As a means for adjusting the amount of carbon dioxide enclosed, only the supply means is prepared, and when reducing the amount enclosed, it can be released to the atmosphere without being recovered, but if supply and release are repeated, high-pressure carbon dioxide is newly replenished There is a need.

  The present invention can adjust the amount of carbon dioxide enclosed in the cycle system by heating and cooling operations without using a driving device such as a high-pressure pump, and can supply carbon dioxide flexibly to changes in the operating state of the gas turbine. It aims at providing a recovery device.

  It is another object of the present invention to provide a carbon dioxide enclosure amount adjusting method for adjusting the amount of carbon dioxide enclosure in a cycle system by a heating / cooling operation without using a driving device such as a high pressure pump.

  According to the first aspect of the present invention, the compressor and the turbine are connected by a flow path, and a regenerator, a heater, and a cooler are provided along the flow path, and are connected to the compressor and the turbine. A carbon dioxide supply and recovery device used in a closed cycle gas turbine having a starter motor and using supercritical carbon dioxide as a working fluid includes a carbon dioxide recovery valve, a carbon dioxide supply valve, and a cooling / heating device. And a refrigerant tank provided.

  The refrigerant tank includes a low temperature side cold tank and a high temperature side hot tank, and the cooling / heating device includes a cooler provided on the upstream side of the cold tank, and a downstream side of the hot tank. You may comprise from the provided heater.

  The cold tank may be disposed above the hot tank, and the cold tank and the hot tank may be connected by a connecting pipe through which supercritical carbon dioxide flows and a pressure equalizing pipe.

  According to the second aspect of the present invention, the compressor and the turbine are connected by a flow path, and a regenerator, a heater, and a cooler are provided along the flow path, and are connected to the compressor and the turbine. A carbon dioxide enclosure amount adjusting method for adjusting a carbon dioxide enclosure amount of a closed cycle gas turbine having a starter motor and using supercritical carbon dioxide as a working fluid while cooling the carbon dioxide in the closed cycle gas turbine A carbon dioxide recovery step of recovering carbon dioxide; and a carbon dioxide supply step of supplying carbon dioxide while heating the carbon dioxide in the closed cycle gas turbine.

  The carbon dioxide recovery step is a step of recovering carbon dioxide while cooling a refrigerant tank provided in the closed cycle gas turbine with a cooling / heating device, and the carbon dioxide supply step is a step of cooling the refrigerant tank with the cooling It may be a step of supplying carbon dioxide while heating with a heater.

  The carbon dioxide recovery step is a step of recovering carbon dioxide by cooling the carbon dioxide with a cooler built in a cold tank provided in the closed cycle gas turbine or provided above the cold tank. The carbon dioxide supply step may be a step of supplying carbon dioxide by a heater built in a hot tank provided in the closed cycle gas turbine or provided in a lower part of the hot tank. .

  According to the carbon dioxide supply and recovery device and the carbon dioxide enclosure amount adjusting method according to the aspect of the present invention, the carbon dioxide enclosure amount in the cycle system can be adjusted by heating / cooling operation without using a drive device such as a pump. it can. For this reason, it can respond flexibly to changes in the operating state of the closed cycle gas turbine.

  Further, if an appropriately sized hot tank and cold tank are used, it is not necessary to replenish carbon dioxide, which is a working fluid of the gas turbine, as long as there is no leakage of carbon dioxide from piping or the like.

It is a figure showing the closed cycle gas turbine provided with the carbon dioxide supply recovery device concerning a 1st embodiment of the present invention. It is a figure showing an example of a carbon dioxide supply recovery device concerning a 1st embodiment of the present invention. It is a figure showing an example of a carbon dioxide supply recovery device concerning a 1st embodiment of the present invention. It is a figure showing an example of a carbon dioxide supply recovery device concerning a 1st embodiment of the present invention. It is a figure which shows the principal part of the carbon dioxide supply recovery apparatus which concerns on 2nd Embodiment of this invention. It is explanatory drawing when supplying and collect | recovering a carbon dioxide in a closed cycle gas turbine using the carbon dioxide supply and recovery apparatus which concerns on 2nd Embodiment of this invention. It is explanatory drawing when transferring a carbon dioxide from a cold tank to a hot tank in the carbon dioxide supply and recovery device concerning a 2nd embodiment of the present invention.

[First Embodiment]
A first embodiment of the present invention will be described below with reference to FIG.
FIG. 1 shows a closed cycle gas turbine (hereinafter referred to as “cycle”) 100 according to a first embodiment of the present invention. The cycle 100 includes a compressor 1, a turbine 2, a regenerator 3, a heater 4, a cooler 5, a motor / generator 6 as a starting motor, a bypass 7, an expansion valve 8, and a flow rate control. A valve 9 and a carbon dioxide supply and recovery device 20 are provided.

  The compressor 1 and the turbine 2 are connected to a motor / generator 6 through a shaft 10 so that power can be transmitted. The outlet of the compressor 1 and the inlet of the turbine 2 are connected by piping through a regenerator 3 and a heater 4. The turbine 2 is provided with a bypass 7 having an expansion valve 8. The bypass 7 branches off from the pipe before the inlet of the turbine 2 and is connected to the outlet pipe of the turbine 2. The junction between the bypass 7 and the piping at the outlet of the turbine 2 is a bypass junction 11. A flow control valve 9 is installed between the outlet of the turbine 2 and the bypass junction 11. The bypass junction 10 and the inlet of the compressor 1 are connected by piping through the regenerator 3 and the cooler 5, and the cycle 100 constitutes a closed cycle.

  The cycle 100 uses carbon dioxide as a working medium. The cycle 100 contains a predetermined amount of carbon dioxide after evacuation. As a heat source of the heater 4, exhaust heat of 300 ° C. or less can be used in addition to various known fuels. The cooler 5 is cooled by a cooling heat medium having an outside air temperature.

  The carbon dioxide supply / recovery device 20 is provided by branching from a branching portion 12 provided at the outlet of the compressor 1. The downstream side of the carbon dioxide supply / recovery device 20 joins the pipe before the inlet side of the compressor 1 at the junction 13. That is, the carbon dioxide supply and recovery device 20 according to the present embodiment is provided so as to bypass the compressor 1 via the branching section 12 and the merging section 13. An enclosure amount adjusting valve 14 is provided downstream of the branching unit 12 and before the inlet of the regenerator 3. A recovery valve 21, which is a carbon dioxide recovery valve, is provided downstream of the branching unit 12 and in front of the carbon dioxide supply and recovery device 20. A supply valve 22, which is a carbon dioxide supply valve, is provided downstream of the carbon dioxide supply and recovery device 20 and before the junction 13.

  The carbon dioxide supply and recovery device 20 includes a refrigerant tank 24 and a cooling / heating device 23. The refrigerant tank 24 is used to store the carbon dioxide enclosed in the cycle 100. The cooling / heating device 23 is attached to the refrigerant tank 24 and is used to cool and heat the carbon dioxide stored in the refrigerant tank 24. The cooling / heating device 23 may be of any type as long as it can cool and heat the carbon dioxide stored in the refrigerant tank 24.

[Method of adjusting carbon dioxide filling amount]
Hereinafter, a method for adjusting the amount of carbon dioxide enclosed in the cycle 100 using the carbon dioxide supply and recovery apparatus according to the present embodiment will be described with reference to FIG.

(1) At the start of the cycle 100 (carbon dioxide supply process)
First, the operation of the cycle 100 will be described with reference to FIG. At the start of the cycle 100, the expansion valve 8 is opened at a predetermined opening, and the flow control valve 9 is closed. After flowing a cooling heat medium (not shown) through the cooler 5, the motor / generator 6 is used as a starting motor to drive the compressor 1 and the turbine 2. While the carbon dioxide is heated by the heater 4, the rotational speeds of the compressor 1 and the turbine 2 are increased.

The operating condition of the cycle 100 according to the present embodiment can be evaluated by Expression (1). Here, p is pressure (Pa), ρ is density (kg / m ³ ), U is the peripheral speed (m / s) of the impeller in the case of a radial turbine, and the average axial flow velocity (in the case of an axial turbine) m / s). Subscripts i and o represent an inlet and an outlet, respectively.

_{Ψ = (p i -p o)} / (ρ i U 2/2) ··· (1)

  When the value obtained by equation (1) exceeds a predetermined value determined from the turbine characteristics, it is determined that the turbine 2 can generate an output without causing backflow or excessive flow, and the flow control valve is closed while the expansion valve 8 is closed. 9 is opened. When the flow rate control valve 9 is fully opened and the expansion valve 8 is fully closed and the flow rate of the turbine 2 is increased, the output of the turbine 2 increases and eventually the self-sustaining operation is started.

  Here, when carbon dioxide in an amount necessary for the operation state in the cycle 100 is sealed from the beginning, the carbon dioxide is separated into two phases at the time of starting the turbine 2 where the temperature of the equipment and piping is low. If the droplets are supplied to the compressor 1, the compressor may be damaged. For this reason, at the start of the cycle 100, the amount of carbon dioxide necessary for the operating state is not enclosed. Therefore, when the output of the turbine 2 increases and the cycle 100 reaches a state where it enters a self-sustained operation, the carbon dioxide enclosed in the cycle 100 becomes insufficient.

Therefore, after the output of the turbine 2 increases and the cycle 100 enters a self-sustaining operation and the operation is stabilized, the carbon dioxide supply and recovery device 20 supplies the insufficient carbon dioxide into the cycle 100. Specifically, the carbon dioxide stored in the refrigerant tank 24 is heated by the cooling / heating device 23. The carbon dioxide in the heated refrigerant tank 24 rises in temperature and vaporizes. Once fully warmed until carbon dioxide vaporizes in the refrigerant tank 24, while closing the recovery valve 21, opening the supply valve 22. Then, the carbon dioxide in the refrigerant tank 24 heated and vaporized and having increased in pressure is supplied into the cycle 100 through the supply valve 22 and the junction portion 13 due to a pressure difference from the system pressure in the cycle 100. The When the predetermined carbon dioxide filling amount is reached, the supply valve 22 is closed.

(2) When cycle 100 is stopped (carbon dioxide recovery process)
When the cycle 100 is stopped and left, the apparatus is cooled in the atmosphere, the carbon dioxide in the cycle 100 becomes saturated, the liquid partially stays, and a so-called sleep operation in which the liquid flows into the compressor or turbine at the start is performed. There is a risk of triggering. For this reason, when the cycle 100 is stopped, it is necessary to recover the carbon dioxide so that the carbon dioxide is not saturated in the cycle 100 during the stop.

When the cycle 100 is stopped, the refrigerant tank 24 is cooled and decompressed by the cooling / heating device 23. Then, at the same time as opening the recovery valve 21, the enclosed amount adjustment valve 14 is throttled . Then, a portion of the carbon dioxide fed from the compressor 1 through the minute Kibe 12 through the recovery valve 21, flows into the refrigerant tank 24. At this time, since the refrigerant tank 24 is cooled by the cooling / heating device 23, the carbon dioxide flowing into the refrigerant tank 24 is stored in the refrigerant tank 24 while being liquefied. In this way, the carbon dioxide in the cycle 100 is recovered by the carbon dioxide supply and recovery device 20.
At this time, it goes without saying that the outlet temperature of the cooler 5 is controlled so that carbon dioxide does not enter a gas-liquid two-phase state at the inlet of the compressor 1.

  As described above, according to the present embodiment, the carbon dioxide supply and recovery device provided in the cycle 100 is cooled or heated, so that the carbon dioxide in the cycle 100 system can be used without using an external driving device such as a pump. The amount of encapsulation can be adjusted. For this reason, it can respond flexibly to changes in the operating state of the closed cycle gas turbine.

[Example of carbon dioxide supply and recovery equipment]
Hereinafter, a configuration example of the carbon dioxide supply and recovery device 20 according to the present embodiment will be described with reference to FIGS. 2 to 4.

[Configuration example 1]
A cycle 200 including the configuration example 1 of the carbon dioxide supply and recovery apparatus 20 is shown in FIG. The carbon dioxide supply and recovery device 20 included in the cycle 200 uses the heating medium HM used by the heater 4 and the cooling medium CM used by the cooler 5 as the cooling / heating device 23. The heating medium HM is branched from the supply path to the heater 4 and supplied to the refrigerant tank 24. The cooling medium CM is branched from the supply path to the cooler 5 and supplied to the refrigerant tank 24. In the cycle 200, the carbon dioxide stored in the refrigerant tank 24 is heated and cooled by adjusting the supply amounts of the heating medium HM and the cooling medium CM to the refrigerant tank 24.

[Configuration example 2]
A cycle 300 including the configuration example 2 of the carbon dioxide supply and recovery apparatus 20 is shown in FIG. The cycle 300 is similar to the cycle 200 in that the cooling medium CM used by the cooler 5 is used as a cooling source, except that carbon dioxide output from the turbine 2 is used as a heating source. As shown in FIG. 3, in the cycle 300, the outlet pipe of the turbine 2 is branched. One of the branched pipes is connected to the cooler 5. The other branched pipe is arranged in the refrigerant tank 24. Then, the carbon dioxide stored in the refrigerant tank 24 is heated by flowing high-temperature carbon dioxide output from the turbine 2 into the pipe disposed in the refrigerant tank 24. The configuration of the cycle 300 is suitable for the case where the heater 4 is a “method of burning the fuel and heating the working fluid (carbon dioxide)” such as a boiler.

[Configuration example 3]
A cycle 400 including the configuration example 3 of the carbon dioxide supply and recovery apparatus 20 is shown in FIG. The cycle 400 is similar to the cycle 300 in that the carbon dioxide output from the turbine 2 is used as a heating source, but is different in that the chiller unit CU is used as a cooling source. As shown in FIG. 4, in the cycle 400, an independent chiller unit CU as a cooling source is connected to the refrigerant tank 24. Then, the carbon dioxide stored in the refrigerant tank 24 is cooled by the chiller unit CU. According to the configuration of the cycle 400, the temperature of the cooling medium can be further lowered without being affected by the outside air temperature or the like, so that carbon dioxide can be efficiently recovered.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 5-7. In addition, the same code | symbol is attached | subjected to the component which is common in 1st Embodiment, and the overlapping description is abbreviate | omitted. This embodiment is different from the first embodiment in the configuration of the carbon dioxide supply and recovery device.

FIG. 5 shows a carbon dioxide supply and recovery device 30 according to this embodiment. The carbon dioxide supply and recovery device 30 includes a cooler 31, a cold tank 32, a hot tank 33, and a heater 34. The cold tank 32 is a low-temperature side refrigerant tank and stores liquefied carbon dioxide. The hot tank 33 is a high-temperature side refrigerant tank, and heats and vaporizes the internal carbon dioxide.
The cold tank 32 is preferably kept cold so that the recovered carbon dioxide is not heated by the wall surface of the cold tank 32 or provided with a cooling device such as a water cooling jacket. The hot tank 33 is insulated so that the heated carbon dioxide does not cool, and the carbon dioxide flowing from the cold tank 32 is not heated when the carbon dioxide is transferred from the cold tank 32, or the temperature of a cold / hot water jacket or the like is adjusted. More preferably, an apparatus is provided.
The type of the cooler 31 is not particularly limited as long as it can cool carbon dioxide. The heater 34 may be of any type as long as it can vaporize carbon dioxide by heating.

The cold tank 32 and the hot tank 33 are connected by a connecting pipe 41 having a connecting valve 36. A cooler 31 is provided on the upstream side of the cold tank 32. Downstream of the hot tank 33, the heater 34 is connected via the heating valve 37.
The cold tank is provided with a recovery pipe 50 having a return valve 35. The recovery pipe 50 is guided to the cooler 31.
The hot tank 33 is provided with a pressure equalizing pipe 42 having a pressure equalizing valve 38. The pressure equalizing pipe 42 is connected to the upstream side of the cooler 31. That is, the hot tank 33 is connected by the connecting pipe 41 and is connected by the pressure equalizing pipe 42 through the cooler 31.
On the upstream side of the cooler 31, the recovery valve 21 is provided further upstream of the junction with the pressure equalizing pipe 42. The upstream side of the recovery valve 21 is connected to the branch portion 12. A supply valve 22 is provided on the downstream side of the heater 34. A downstream side of the heater 34 and an upstream side of the supply valve 22 is branched, and is bypassed to the upstream side of the pressure equalizing valve 38 by a bypass pipe 43 provided with a bypass valve 39. The downstream side of the supply valve 22 is connected to the junction 13. In this way, the carbon dioxide supply and recovery device 30 is connected to the cycle 100 to constitute a closed cycle.

  In the present embodiment, it is more preferable that the cooler 31, the cold tank 32, the hot tank 33, and the heater 34 are arranged in order in the vertical direction.

[Method of adjusting carbon dioxide filling amount]
Hereinafter, with reference to FIG. 6, illustrating a method of adjusting the carbon dioxide filling quantity in the cycle 100 using the carbon dioxide supply and recovery apparatus according to this embodiment.

(1) At the start of the cycle 100 (carbon dioxide supply process)
When supplying carbon dioxide to the cycle 100, the heating valve 37 and the bypass valve 39 are opened, and the carbon dioxide in the hot tank 33 is introduced to the heater 34 and heated. After confirming that the hot tank 33 is at a higher pressure than the pressure in the pipe on the downstream side of the supply valve 22, the supply valve 22 is opened. At this time, the connecting valve 36 and the pressure equalizing valve 38 are closed. If the heater 34 is installed at a position lower than the hot tank 33, the carbon dioxide in the hot tank 33 can be heated by the heater 34 by convection only by opening the heating valve 37 and the bypass valve 39.

(2) When cycle 100 is stopped (carbon dioxide recovery process)
Carbon dioxide from the cycle 100 is guided to the cooler 31 through the recovery pipe 50 when the recovery valve 21 and the return valve 35 are opened. The carbon dioxide led to the cooler 31 is cooled and liquefied or becomes high density. The liquefied or high-density carbon dioxide is collected in the cold tank 32 by gravity. At this time, the connecting valve 36 and the pressure equalizing valve 38 are closed. Here, the piping upstream of the recovery valve 21 is installed so as to be on the higher pressure side than the recovery piping 50.

  As described above, according to the present embodiment, the amount of carbon dioxide enclosed in the timely cycle system is adjusted by independently adjusting the temperature using the cold tank 32 for carbon dioxide recovery and the hot tank 33 for supply. Can be adjusted.

  Further, according to the present embodiment, the carbon dioxide in the hot tank 33 is heated by the heater to increase the pressure, and the carbon dioxide can be supplied into the cycle system without using a driving device such as a pump. .

  Furthermore, according to the present embodiment, the carbon dioxide in the cycle system is cooled by the cooler 31, and liquefied carbon dioxide or supercritical carbon dioxide having a high density is caused to flow into the cold tank 32 due to its weight or density difference. Can be recovered.

  In the above description, the cooler 31 and the heater 34 are provided separately from the cold tank 32 and the hot tank 33. However, in the present embodiment, the cooler may be built in the cold tank. In this case, the cooler is installed at the top of the cold tank. The heater may be built in the hot tank. In this case, the heater is installed below the hot tank.

In the present embodiment, if carbon dioxide is continuously supplied into the cycle 100, the density of carbon dioxide in the hot tank 33 decreases, and even if the temperature is increased by heating, the pressure cannot be sufficiently increased. In this case, it is necessary to transfer the liquefied carbon dioxide in the cold tank 32 or the low-temperature / high-density supercritical carbon dioxide to the hot tank 33. It will be described below with reference to steps of transporting carbon dioxide in the cold tank 32 to the hot tank 33 in FIG.

The heating valve 37 and the bypass valve 39 are closed to stop heating. Further, the recovery valve 21 is also closed, and the supply of carbon dioxide to the carbon dioxide supply and recovery device 30 is also stopped. Usually, the cold tank 32 has a low temperature and a low pressure, and the hot tank 33 has a high temperature and a high pressure. However, when the pressure equalizing valve 38 is opened, the pressures in the cold tank 32 and the hot tank 33 become equal. If the pipe from the bottom of the cold tank 32 is connected to the upper part of the hot tank 33, and the cold tank 32 is installed at a higher position, the connection valve 36 is opened, so that the carbon dioxide in the cold tank 32 is removed. It can be poured into the hot tank 33.

  As described above, according to the present embodiment, the hot tank 33 and the cold tank 32 are connected by the connecting pipe 41 through which the liquefied carbon dioxide or high-density supercritical carbon dioxide flows and the pressure equalizing pipe 42 for pressure equalization. . Thereby, the carbon dioxide in the cold tank 32 can be transferred to the hot tank 33 using the difference in carbon dioxide density in both tanks.

  In the present embodiment, even when the recovery pipe 50 is not connected, if a device for cooling the cold tank 32 such as a water cooling jacket is attached from the outside, the inside of the cold tank 32 is kept at a low temperature and low pressure, thereby cycling carbon dioxide. 100 can be recovered.

  According to the carbon dioxide supply and recovery device and the carbon dioxide enclosure amount adjusting method according to the aspect of the present invention, the carbon dioxide enclosure amount in the cycle system can be adjusted by heating / cooling operation without using a drive device such as a pump. it can.

1 Compressor 2 Turbine 3 Regenerator 4 Heater 5 Cooler 6 Motor generator (starting motor)
DESCRIPTION OF SYMBOLS 7 Bypass 8 Expansion valve 9 Flow control valve 10 Shaft 11 Bypass merge part 12 Branch part 13 Merge part 14 Enclosed amount adjustment valve 20, 30 Carbon dioxide supply recovery device 21 Recovery valve (carbon dioxide recovery valve)
22 Supply valve (carbon dioxide supply valve)
23 Cooling / heating device 24 Refrigerant tank 31 Cooling device 32 Cold tank 33 Hot tank 34 Heating device 35 Return valve 36 Connection valve
37 Heating valve 38 Pressure equalizing valve 41 Connecting piping 42 Pressure equalizing piping 50 Recovery piping

Claims (6)

A compressor and a turbine are connected by a flow path, and a regenerator, a heater, and a cooler are provided along the flow path, and the compressor and the starter motor connected to the turbine are provided. A carbon dioxide supply and recovery device used in a closed cycle gas turbine using carbon as a working fluid,
A carbon dioxide recovery valve;
A carbon dioxide supply valve;
A carbon dioxide supply and recovery device having a refrigerant tank equipped with a cooling / heating device. The carbon dioxide supply and recovery device according to claim 1,
The refrigerant tank is composed of a cold tank on the low temperature side and a hot tank on the high temperature side,
The cooling / heating device includes a cooler provided on the upstream side of the cold tank and a heater provided on the downstream side of the hot tank. The carbon dioxide supply and recovery device according to claim 2,
The cold tank is disposed above the hot tank,
The cold tank and the hot tank are connected by a connecting pipe through which supercritical carbon dioxide flows and a pressure equalizing pipe. A compressor and a turbine are connected by a flow path, and a regenerator, a heater, and a cooler are provided along the flow path, and the compressor and the starter motor connected to the turbine are provided. A carbon dioxide enclosure amount adjusting method for adjusting the carbon dioxide enclosure amount of a closed cycle gas turbine using carbon as a working fluid,
A carbon dioxide recovery step of recovering carbon dioxide while cooling the carbon dioxide in the closed cycle gas turbine;
A carbon dioxide supply step of supplying carbon dioxide while heating the carbon dioxide in the closed cycle gas turbine;
A method for adjusting the amount of carbon dioxide enclosed. The method for adjusting the amount of carbon dioxide enclosed according to claim 4,
The carbon dioxide recovery step is a step of recovering carbon dioxide while cooling a refrigerant tank provided in the closed cycle gas turbine with a cooling / heating device,
The carbon dioxide supply step is a step of supplying carbon dioxide while heating the refrigerant tank with the cooling / heating device. The method for adjusting the amount of carbon dioxide enclosed according to claim 4,
The carbon dioxide recovery step is a step of recovering carbon dioxide by cooling the carbon dioxide with a cooler built in a cold tank provided in the closed cycle gas turbine or provided at an upper part of the cold tank. ,
The carbon dioxide supply step is a step of supplying carbon dioxide by a heater built in a hot tank provided in the closed cycle gas turbine or provided in a lower part of the hot tank. .

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