Power generation facility and power generation method

Abstract

To appropriately increase the pressure of a target gas which should be increased in pressure without using a booster that involves large energy consumption such as a compressor, and to generate power using the target gas at an increased pressure without supplying energy from other sources.SOLUTION: A bag membrane interior SP1 is configured to be connectable to a high-pressure conduit PH through which a high-pressure fluid flows that is at a pressure higher than the pressure of target gas TG received in a temporary storage tank T1, and a generator GE is provided that can generate electricity with rotational power of the turbine T. A control device is provided that carries out an expansion process to connect the bag membrane interior SP1 to the high-pressure conduit PH with the target gas TG present in a storage space SP2, and generates electricity with the generator GE by blowing out the target gas TG in the storage space SP1 after being pressurized in the expansion process from a blowing section PS2a of the temporary storage tank T1 to rotate the turbine T.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power generation facility and a power generation method that generates electricity using the fluid pressure of a fluid supplied from the outside. [Background technology]

[0002] Conventionally, as a power generation facility that generates electricity using the fluid pressure of a fluid supplied from outside, a differential pressure power generation device has been known, which is equipped with an expansion turbine in a gas pipe as a gas supply system that supplies fuel gas, which expands the fuel gas flowing from the primary side to reduce the pressure to the secondary side, and which is equipped with a generator using the shaft output of the expansion turbine (see Patent Document 1). In the differential pressure power generation device disclosed in Patent Document 1, the temperature of the fuel gas after being decompressed by the expansion turbine drops significantly when the expansion turbine is rotated. Therefore, the fuel gas is heated by various heating devices and then supplied to the secondary side before being supplied to the secondary demand destination. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-165382 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology disclosed in Patent Document 1, the expansion turbine is directly rotated by the fuel gas supplied to the secondary side, so it is necessary to provide a heating device for heating the fuel gas after it has passed through the expansion turbine and its temperature has been reduced, and it is also necessary to supply thermal energy from the outside to heat the fuel gas in the heating device. Therefore, there is room for improvement from the viewpoint of simplifying the structure and improving energy efficiency.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a power generation facility and a power generation method that can appropriately boost the pressure of a target gas to be boosted without using a booster such as a compressor that consumes a large amount of energy, and that can generate electricity using the boosted target gas without supplying energy from anywhere. [Means for solving the problem]

[0006] The characteristic configuration of the power generation facility to achieve the above objectives is as follows: a temporary storage tank having a receiving section for receiving a target gas to be pressurized, a storage space for temporarily storing the received target gas, and a blowing section for blowing the target gas in the storage space to the outside; an expanding and contracting bag membrane that expands when a fluid flows into the bag membrane from the outside and contracts when the fluid is discharged from the bag membrane is provided inside the storage space of the temporary storage tank in a state in which the inside of the bag membrane is airtightly partitioned from the storage space; The inside of the bag membrane is configured to be connectable to a high-pressure conduit through which the fluid flows at a pressure higher than the pressure of the target gas received in the temporary storage tank, Equipped with a generator that can generate electricity using the rotational power of the turbine, The device is characterized in that it is equipped with a control device that performs an expansion process to connect the inside of the bag membrane with the high-pressure conduit while the target gas is present in the storage space, and generates electricity using the generator by blowing out the target gas in the storage space that has been pressurized in the expansion process from the blowing part of the temporary storage tank to rotate the turbine.

[0007] The characteristic configuration of the power generation method for achieving the above object is as follows: A power generation method for a power generation facility that pressurizes a target gas that is a target for pressurization and generates power using the pressurized target gas, The apparatus includes a temporary storage tank having a receiving section for receiving the target gas to be pressurized, a storage space for temporarily storing the received target gas, and a blowing section for blowing the target gas in the storage space to the outside, an expanding and contracting bag membrane that expands when a fluid flows into the bag membrane from the outside and contracts when the fluid is discharged from the bag membrane is provided inside the storage space of the temporary storage tank in a state in which the inside of the bag membrane is airtightly partitioned from the storage space; The power generation facility is configured so that the inside of the bag membrane can be connected to a high-pressure conduit through which the fluid flows at a pressure higher than the pressure of the storage space, and is equipped with a generator that can generate electricity using the rotational power of a turbine, While the target gas is present in the storage space, an expansion process is carried out to connect the inside of the bag membrane with the high-pressure conduit, and the target gas in the storage space, which has been pressurized in the expansion process, is blown out from the blowing section of the temporary storage tank to rotate the turbine, thereby generating electricity using the generator.

[0008] According to the above characteristic configuration, a temporary storage tank is provided with a storage space for temporarily storing the target gas, and an expansion / contraction bag membrane is provided inside the storage space of the temporary storage tank, with the inside of the bag membrane being airtightly separated from the storage space, and the inside of the bag membrane expands when fluid flows into the inside of the bag membrane from the outside and contracts when fluid is discharged from inside the bag membrane.In this configuration, the inside of the bag membrane is configured to be connectable to a high-pressure conduit through which a fluid with a high pressure higher than the pressure of the target gas received in the temporary storage tank flows, so that a fluid with a high pressure higher than the pressure of the storage space can be introduced into the inside of the bag membrane, and the expansion / contraction bag membrane can be expanded at high pressure. Furthermore, by having the control device execute an expansion step that connects the inside of the bag membrane with the high-pressure conduit while the target gas is present in the storage space, the target gas in the storage space can be compressed at high pressure and increased in pressure without using a compressor that requires an external power supply, etc. In addition, by generating electricity with a generator in a form in which the pressurized target gas in the storage space is blown out from the outlet of the temporary storage tank to rotate the turbine, the turbine can be rotated well using the target gas to obtain generated power, and by using a gas that can be dissipated into the atmosphere, such as air, as the target gas, even if the temperature of the target gas is significantly reduced by rotating the turbine, there is no need to heat the target gas, so a power generation facility can be realized with a simple configuration that does not require a heating device, and there is no need to supply thermal energy for heating, so overall power generation efficiency can be expected to improve. As described above, it is possible to realize a power generation facility and a power generation method that can appropriately boost the pressure of the target gas to be boosted without using a booster such as a compressor, which involves large energy consumption, and that can generate electricity using the boosted target gas without supplying energy from elsewhere.

[0009] Further characteristic configurations of the power generation equipment are: The inside of the bag membrane is configured to be communicatively connectable to a low-pressure conduit through which the fluid flows, the low-pressure conduit having a pressure lower than the pressure of the target gas received in the temporary storage tank, The control device alternately performs a contraction process, which connects the inside of the bag membrane with the low-pressure conduit, and the expansion process while allowing the target gas to flow from the receiving section into the storage space.

[0010] According to the above characteristic configuration, the inside of the bag membrane is configured to be connectable to a low-pressure conduit through which a low-pressure fluid flows that is lower than the pressure of the target gas received in the temporary storage tank. For example, the control device can realize a contraction process that connects the inside of the bag membrane to the low-pressure conduit in a state in which the target gas can flow from the receiving section into the storage space via a check valve or the like, with a highly energy-saving configuration that does not use a blower or the like that requires an external power supply. Furthermore, because this configuration allows the fluid used to inflate the inflation-deflation bag membrane to be guided to the low-pressure conduit during the contraction process, for example, by installing this power generation equipment at a location where the pressure of a fluid such as city gas is reduced from a high-pressure conduit to a low-pressure conduit, it is possible to effectively utilize the pressure energy that was not previously used when reducing the pressure of the city gas to achieve a pressure increase of the target gas. The city gas used as the fluid for pressure increase can be smoothly guided to the gas usage location via the low-pressure conduit, as before.

[0011] Further characteristic configurations of the power generation equipment are: The temporary reservoir is configured as a part of a conduit through which the fluid flows.

[0012] According to the above-mentioned characteristic configuration, the temporary storage tank is constructed from a portion of the piping through which the fluid flows. Therefore, for example, the temporary storage tank can be buried underground like other high-pressure and low-pressure pipes. Compared to installing a new fluid storage tank above ground, there is no need to secure installation space above ground, and deterioration of the landscape can be prevented. Furthermore, if unused high-pressure pipelines or low-pressure pipeline branches buried underground can be used as temporary storage tanks, initial costs can be reduced.

[0013] Further characteristic configurations of the power generation equipment are: The pressurized gas flow path that connects the blow-out portion and the turbine is provided with a flow condition adjustment valve that can allow fluid to flow from the blow-out portion to the turbine and can prohibit fluid from flowing from the turbine to the blow-out portion.

[0014] As in the above-described characteristic configuration, a flow state adjustment valve is provided in the pressurized gas flow path that connects the blow-out portion and the turbine, and is in an open state to allow fluid to flow from the blow-out portion to the turbine and in a closed state to prohibit fluid from flowing from the turbine to the blow-out portion.For example, after the target gas is pressurized in the expansion process, the flow state adjustment valve can be set to an open state, and the high-pressure target gas blown out from the storage space can be effectively used to rotate the turbine and generate electricity.

[0015] Further characteristic configurations of the power generation equipment are: A plurality of the temporary storage tanks are provided, The control device blows out the target gas to rotate the turbine in a manner that sequentially switches the timing at which the pressurized target gas is blown out from the blow-out portions of the multiple temporary storage tanks.

[0016] As described above, by providing a plurality of temporary storage tanks and sequentially switching the timing at which pressurized target gas is blown out from the blowout ports of the plurality of temporary storage tanks to blow out the target gas and rotate the turbine, even when one temporary storage tank is in a contraction process and cannot blow out the target gas from the blowout port, another temporary storage tank can be set in an expansion process (or a process after the expansion process is completed and before the contraction process is executed) to blow out the target gas from the blowout port. This makes it possible to realize, for example, a power generation facility that can continuously blow out the target gas to the turbine, thereby continuously rotating the turbine and generating continuous electricity with the generator. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic diagram showing the power generation facility of the present invention in an expansion process in which the generator is not generating power; FIG. [Figure 2] 1 is a schematic diagram showing the power generation state of a power generator in a blowing process in the power generation facility of the present invention. FIG. [Figure 3] 1 is a schematic diagram showing the power generation facility of the present invention in a contraction process and in a non-power generating state; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] The power generation facility 100 and power generation method according to an embodiment of the present invention relate to a facility and method that can appropriately boost the pressure of a target gas to be boosted without using a booster such as a compressor that consumes a large amount of energy, and that can generate power using the boosted target gas without supplying energy from elsewhere.

[0019] Hereinafter, with reference to the drawings, a description will be given of a power generation facility 100 and a power generation method using the power generation facility 100. Note that in this embodiment, the pressure of the target gas, etc. is shown, but this pressure is an example and is not limited to this value.

[0020] <Power generation facilities> As shown in FIGS. 1 to 3, the power generation facility 100 includes a temporary storage tank T1 having a receiving section PS5a that receives a target gas TG (for example, air) to be pressurized, a storage space SP2 that temporarily stores the received target gas TG, and a blowout section PS2a that blows out the target gas TG in the storage space SP2 to the outside. The temporary storage tank T1 includes an expansion / contraction bag membrane that expands when a fluid (in this embodiment, city gas 13A) flows into the bag membrane interior SP1 from the outside and contracts when the fluid is discharged from the bag membrane interior SP1. The MF is provided inside the storage space SP2 of the temporary storage tank T1, with the bag membrane interior SP1 airtightly partitioned from the storage space SP2, and the bag membrane interior SP1 is configured to be connectable to a high-pressure conduit PH through which a high-pressure fluid received into the temporary storage tank T1 flows, the high-pressure conduit PH being equal to or higher than the pressure of the target gas TG, and the bag membrane interior SP1 is configured to be connectable to a low-pressure conduit PL through which a low-pressure fluid received into the temporary storage tank T1 flows, the low-pressure conduit PL being equal to or lower than the pressure of the target gas TG, and a control device (not shown) is provided for controlling operation.

[0021] To further explain, the receiving section PS5a of the temporary storage tank T1 is connected to a target gas supply passage PS5 that supplies the target gas TG at a constant pressure (e.g., 0.05 MPaG), and the blowing section PS2a is connected to a pressurized gas flow passage PS2 that guides the pressurized target gas TG to the turbine T. The target gas supply passage PS5 is provided with a second check valve NV2 that prevents the target gas TG from flowing back from the temporary storage tank T1 to the target gas supply passage PS5, and the pressurized gas flow passage PS2 is provided with a first check valve NV1 that prevents the target gas TG from flowing back from the turbine T to the temporary storage tank T1, and a second switching valve V2 that opens and closes the pressurized gas flow passage PS2. In other words, the first check valve NV1 functions as a flow condition regulating valve that can allow the flow of fluid from the blowing section PS2a to the turbine T and can prohibit the flow of fluid from the turbine T to the blowing section PS2a. That is, the turbine T is configured to be rotatable by the pressurized target gas TG, and the turbine T is provided with a generator GE that generates electricity using the rotational power (shaft output) of the turbine T.

[0022] The temporary storage tank T1 may be cylindrical or spherical and made of steel. The expansion / contraction membrane MF can be made of various materials that can withstand the pressure difference (approximately 0.4 MPa) between the membrane interior SP1 and the storage space SP2, but a flexible material that maintains its softness over a wide temperature range and maintains its flexibility stably at both low and high temperatures is particularly preferred. For example, nitrile rubber (NBR), which is used as a measuring membrane for medium-pressure meters with a pressure resistance of 0.9 MPa, is preferably used. The volume of the temporary storage tank T1 is preferably small from the viewpoint of installation space. 3 The volume of the interior SP1 of the inflatable / contractable membrane MF when inflated can also be set to the same extent.

[0023] The high-pressure conduit PH is connected to the inside SP1 of the bag membrane via a fluid flow path PS1, and the fluid flow path PS1 is provided with a first switching valve V1 that can switch the fluid flow path PS1 between an open state and a closed state. Furthermore, a low-pressure conduit PL is connected to the fluid flow path PS1 between the first switching valve V1 and the inside of the bag membrane SP1, and the low-pressure conduit PL is provided with a governor G whose opening is adjusted so that the pressure on the secondary side becomes a predetermined target pressure (e.g., 0.002 MPaG). In this embodiment, the pressure of the fluid flowing through the high-pressure conduit PH is 0.65 MPaG, and the supply pressure of the target gas TG is 0.05 MPaG.

[0024] 3, when the control device closes the first switching valve V1 and the second switching valve V2 while the target gas supply path PS5 is in communication with the storage space SP2 of the temporary storage tank T1 and the expansion / contraction bag membrane MF is inflated, the fluid in the bag membrane interior SP1 of the expansion / contraction bag membrane MF is guided to the low-pressure conduit PL, and a contraction process is executed in which the expansion / contraction bag membrane MF contracts. That is, because the supply pressure of the target gas TG is higher than the pressure on the secondary side of the governor G of the low-pressure conduit PL, when the fluid flow path PS1 and the low-pressure conduit PL are in communication, the supply pressure of the target gas TG compresses the bag membrane interior SP1 of the expansion / contraction bag membrane MF, and a contraction process is realized in which the volume of the bag membrane interior SP1 decreases.

[0025] Incidentally, the supply area downstream of the low-pressure pipeline PL contains, for example, 3 billion m 3 A consignment volume of approximately 10 ...

[0026] The temporary storage tank T1 is provided with a first pressure sensor P1 that measures the pressure in the storage space SP2 (for example, the pressure near the blow-out portion PS2a), and the control device, as shown in Fig. 1, after the contraction step, when the target gas TG is present in the storage space SP2 of the temporary storage tank T1 and the expansion / contraction bag membrane MF is contracted, opens the first switching valve V1 and closes the second switching valve V2, executing an expansion step in which high-pressure fluid flowing through the high-pressure conduit PH is guided into the bag membrane interior SP1 of the expansion / contraction bag membrane MF, causing the expansion / contraction bag membrane MF to expand. During this expansion step, the target gas TG present in the storage space SP2 of the temporary storage tank T1 is compressed and pressurized as the expansion / contraction bag membrane MF expands, and the target gas TG is pressurized to a certain pressure or above (expansion step stop pressure: for example, 0.65 MPaG).

[0027] As shown in Figure 2, when the pressure in the storage space SP2 becomes less than the expansion process stop pressure, the control device switches the first switching valve V1 to a closed state and switches the second switching valve V2 to an open state, thereby performing a blow-out process in which the pressurized target gas TG is blown out to the turbine T through the pressurized gas flow path PS2. That is, when the target gas TG is present in the storage space SP2, the control device executes an expansion process to connect the inside of the bag membrane SP1 with the high-pressure conduit PH, and generates electricity in the generator GE by blowing out the target gas TG in the storage space SP2, which has been pressurized in the expansion process, from the blow-out section PS2a of the temporary storage tank T1, thereby rotating the turbine T.

[0028] For example, when the pressure in the storage space SP2 (pressure measured by the first pressure sensor P1) becomes lower than the compression process start pressure (for example, a pressure of approximately 0.1 MPaG or more and 0.65 MPaG or less), the control device closes the first switching valve V1 and the second switching valve V2, guides the high-pressure fluid (city gas 13A) to the low-pressure conduit PL via the fluid flow path PS1, and executes the above-mentioned contraction process to contract the inside SP1 of the bag membrane.

[0029] Incidentally, the temporary storage tank T1 is provided with a second pressure sensor P2 that measures the internal pressure inside the bag membrane SP1, and the control device starts the expansion process when the pressure of the second pressure sensor P2 becomes less than the contraction process stop pressure (for example, a pressure of approximately 0.002 MPaG or more and 0.1 MPaG or less). That is, the control device alternately executes the contraction process and the expansion process, and executes the blow-out process of blowing the target gas TG from the blow-out portion PS2a after executing the expansion process and before executing the contraction process.

[0030] [Another embodiment] (1) In the above embodiment, the control example has been described in which the target gas TG is blown out from the blowout portion PS2a of the temporary storage tank T1 in the blowout process after the expansion process and before the contraction process. As another control, the time when the target gas TG is blown out from the blow-out section PS2a of the temporary storage tank T1 may include the time during the expansion process after the storage space SP2 reaches a predetermined blow-out start pressure (for example, a pressure less than the expansion process stop pressure mentioned above, that is, a pressure of 0.1 MPaG or more and less than 0.65 MPaG). In other words, the control device may execute control to open the second switching valve V2 and guide the target gas TG in the storage space SP2 to the turbine T after the storage space SP2 reaches a predetermined blow-out start pressure during the expansion process.

[0031] (2) In the above embodiment, the pressure of the target gas TG supplied from the target gas supply path PS5 is approximately 0.05 MPaG, the pressure of the fluid flowing through the high-pressure conduit PH is 0.65 MPaG, and the pressure on the secondary side of the low-pressure conduit PL is adjusted to a predetermined target pressure (e.g., 0.002 MPaG). From the viewpoint of improving the output of the turbine T, it is preferable to increase the pressure of the fluid. For example, the pressure of the fluid flowing through the high-pressure conduit PH may be 3 MPaG, and the pressure on the secondary side of the low-pressure conduit PL may be adjusted to, for example, about 0.65 MPaG. In this case, the supply pressure of the target gas TG is set to a pressure higher than 0.65 MPaG.

[0032] (3) In the above blowing process, the control device controls the first switching valve V1 to be in a closed state. However, in the blowing process, the first switching valve V1 may be in an open state.

[0033] (4) In the above embodiment, the fluid flowing into the membrane interior SP1 of the expansion / contraction membrane MF is city gas 13A. However, the fluid may be any fluid that can expand and contract the membrane interior SP1 of the expansion / contraction membrane MF, and may be, for example, pressurized air.

[0034] (5) When pressurized air or the like is used as the fluid that expands and contracts the inside of the bag membrane SP1, a configuration may be adopted in which the fluid flowing out from the inside of the bag membrane SP1 during the contraction process is released into the atmosphere without being guided to the low-pressure conduit PL.

[0035] (6) In the above embodiment, a configuration in which one temporary storage tank T1 is provided has been shown, but a configuration in which a plurality of temporary storage tanks T1 are provided may also be employed. In this case, the control device performs control to blow out the target gas TG and rotate the turbine T, for example, by sequentially switching the time at which the pressurized target gas TG is blown out from the blow-out sections PS2a of multiple temporary storage tanks T1. In other words, when one temporary storage tank T1 is in a contraction process and the target gas TG cannot be blown out from the blowing section PS2a of the one temporary storage tank T1, the control device sets another temporary storage tank T1 in an expansion process (or a blowing process after the expansion process is completed and before the contraction process is performed) and blows out the target gas TG from the blowing section PS2a of the other temporary storage tank T1.

[0036] (7) In the above embodiment, the temporary storage tank T1 is exemplified as an independent housing having a cylindrical or spherical shape, but it may also be configured as a part of a conduit through which the city gas 13A or the like flows.

[0037] (8) In the above embodiment, the control device may control the power generation facility in such a manner that the expansion process, the blowing process, and the contraction process are each performed for a predetermined period of time.

[0038] (9) The first check valve NV1 and the second check valve NV2 may be configured as switching valves whose open / closed states can be switched by a control device, and the control device may actively control the open / closed states.

[0039] (10) In the above embodiment, the target gas TG is air, but various other gases can also be used as the target gas.

[0040] Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, as long as no contradictions arise. Furthermore, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited to these, and can be modified as appropriate within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0041] The power generation equipment and power generation method of the present invention can be effectively used as power generation equipment and power generation method that can appropriately boost the pressure of the target gas to be boosted without using a booster such as a compressor, which involves large energy consumption, and that can generate electricity using the boosted target gas without supplying energy from anywhere. [Explanation of symbols]

[0042] 100: Power generation facilities GE: Generator MF: Expanding and contracting membrane NV1: First check valve P1: First pressure sensor P2: Second pressure sensor PH: High pressure pipe PL: Low pressure pipe PS2a:Blowout part PS5a:Reception Department SP1: Inside the pouch membrane SP2: Storage space T: Turbine T1: Temporary storage tank TG: Target gas

Claims

1. a temporary storage tank having a receiving section for receiving a target gas to be pressurized, a storage space for temporarily storing the received target gas, and a blowing section for blowing the target gas in the storage space to the outside; an expanding and contracting bag membrane that expands when a fluid flows into the bag membrane from the outside and contracts when the fluid is discharged from the bag membrane is provided inside the storage space of the temporary storage tank in a state in which the inside of the bag membrane is airtightly partitioned from the storage space; The inside of the bag membrane is configured to be connectable to a high-pressure conduit through which the fluid flows at a pressure higher than the pressure of the target gas received in the temporary storage tank, Equipped with a generator that can generate electricity using the rotational power of the turbine, A power generation facility comprising a control device that executes an expansion process to connect the inside of the bag membrane with the high-pressure conduit while the target gas is present in the storage space, and generates electricity with the generator by blowing out the target gas in the storage space that has been pressurized in the expansion process from the blowing portion of the temporary storage tank to rotate the turbine.

2. The inside of the bag membrane is configured to be communicatively connectable to a low-pressure conduit through which the fluid flows, the low-pressure conduit having a pressure lower than the pressure of the target gas received in the temporary storage tank, The power generation facility described in claim 1, wherein the control device alternately performs a contraction process, which connects the inside of the bag membrane with the low-pressure conduit, and the expansion process while allowing the target gas to flow from the receiving section into the storage space.

3. The power generation facility according to claim 1 or 2, wherein the temporary storage tank is formed as a part of a conduit through which the fluid flows.

4. 3. The power generation facility according to claim 1, wherein a flow condition adjusting valve is provided in a pressurized gas flow path that connects the blow-out portion and the turbine, and that is capable of allowing a fluid to flow from the blow-out portion to the turbine and prohibiting a fluid to flow from the turbine to the blow-out portion.

5. A plurality of the temporary storage tanks are provided, The power generation facility according to claim 1 or 2, wherein the control device sequentially switches the timing at which the pressurized target gas is blown out from the blowing portions of the plurality of temporary storage tanks to blow out the target gas and rotate the turbine.

6. A power generation method for a power generation facility that pressurizes a target gas that is a target for pressurization and generates power using the pressurized target gas, The apparatus includes a temporary storage tank having a receiving section for receiving the target gas to be pressurized, a storage space for temporarily storing the received target gas, and a blowing section for blowing the target gas in the storage space to the outside, an expanding and contracting bag membrane that expands when a fluid flows into the bag membrane from the outside and contracts when the fluid is discharged from the bag membrane is provided inside the storage space of the temporary storage tank in a state in which the inside of the bag membrane is airtightly partitioned from the storage space; The power generation facility is configured so that the inside of the bag membrane can be connected to a high-pressure conduit through which the fluid flows at a pressure higher than the pressure of the storage space, and is equipped with a generator that can generate electricity using the rotational power of a turbine, A power generation method in which, while the target gas is present in the storage space, an expansion process is carried out to connect the inside of the bag membrane with the high-pressure conduit, and the target gas in the storage space, which has been pressurized in the expansion process, is blown out from the blowing portion of the temporary storage tank to rotate the turbine, thereby generating power with the generator.

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