JP6014106B2 - High pressure gas storage system and high pressure gas storage method - Google Patents

Description

  The present invention relates to a system and method for accumulating high-pressure gas in an accumulator using a gas-driven compressor.

  As a device for filling hydrogen gas into a hydrogen automobile, for example, Patent Literature 1 discloses a hydrogen filling device. Specifically, the hydrogen filling apparatus disclosed in Patent Document 1 includes a hydrogen gas supply source, a compressor, and a pressure accumulator, and pressurizes the hydrogen gas sent from the hydrogen gas supply source with a compressor, Accumulate pressure in the vessel. Then, hydrogen gas stored in the pressure accumulator is filled in the hydrogen automobile.

  By the way, in order to extend the travel distance of the hydrogen automobile, it is necessary to fill the hydrogen gas with a higher pressure. Therefore, a technique for accumulating high-pressure hydrogen gas in the accumulator is required. For example, in Patent Document 2, by providing two compressors, a low-pressure stage compressor and a high-pressure stage compressor, in series, the hydrogen gas sent from the hydrogen gas supply source is boosted in two stages. A method for accumulating hydrogen gas at a high pressure is disclosed.

JP 2013-130218 A JP 2014-88941 A

  By the way, as a compressor used for compression of hydrogen gas, it is common to use a gas drive type booster pump without fear of ignition. When a gas-driven booster pump is used as the gas compressor, the difference in pressure between the driving gas and the compressed gas directly affects the operating speed. That is, the lower the supply pressure of the driving gas, the slower the operating speed of the compressor. Conversely, the higher the driving gas pressure, the faster the operating speed of the compressor. When the pressure of the driving gas is constant, the operating speed tends to increase as the pressure on the discharge side of the compressed gas decreases.

  In the conventional hydrogen gas pressure accumulating system, the driving gas at the rated pressure is always supplied at a constant pressure to the gas driven booster pump regardless of the pressure of the pressure accumulator (that is, the pressure on the discharge side). For this reason, the gas-driven booster pump has been operated at high speed in the state where the pressure of the pressure accumulator is low immediately after the start of pressure accumulation. In particular, when accumulating with a low-pressure stage and a high-pressure stage two-stage compressor, the high-pressure stage gas-driven booster pump operates at an excessively high speed, frequently fails, and requires replacement and maintenance of the main body in a short period of time. There was a problem of becoming.

  Then, this invention is made | formed in view of the said situation, Comprising: It aims at providing the high pressure gas pressure storage system and high pressure gas pressure storage method which can reduce the load of the high pressure stage compressor immediately after the pressure accumulation start. To do.

  In order to solve the above-described problem, according to the first aspect of the present invention, a gas supply source filled with a supply gas, a pressure accumulator for storing the pressurized supply gas, the gas supply source, and the pressure accumulator A supply gas line provided between the low pressure stage compressor and the low pressure stage compressor provided in the supply gas line for boosting the supply gas to a predetermined pressure, and the low pressure stage compressor of the supply gas line A high-pressure compressor that is provided on the secondary side of the compressor and boosts the supply gas that has been pressurized to a predetermined pressure to a higher pressure, and a first drive gas that supplies a first drive gas to the low-pressure compressor. A gas line; and a second driving gas line that supplies a second driving gas to the high-pressure compressor, and pressurizes the supply gas supplied from the gas supply source to supply the high pressure High pressure gas storage to store gas in the accumulator A bypass line provided so that the first driving gas line and the second driving gas line communicate with each other; a first on-off valve provided in the second driving gas line; And a second on-off valve provided in the bypass line, wherein a supply pressure of the second driving gas is lower than a supply pressure of the first driving gas. Is done.

  According to the second aspect of the present invention, the controller for controlling the opening and closing of the first on-off valve and the second on-off valve, and the pressure for measuring the pressure of the gas accumulated in the accumulator 2. The measuring device according to claim 1, wherein the control unit controls opening and closing of the first on-off valve and the second on-off valve based on the pressure measured by the pressure measuring device. A high pressure gas storage system is provided.

  Moreover, according to the invention which concerns on Claim 3, the said gas for supply is hydrogen gas, The high pressure gas accumulator system as described in any one of Claim 1 or 2 characterized by the above-mentioned is provided.

  Moreover, according to the invention which concerns on Claim 4, the said low-pressure stage compressor and the said high-pressure stage compressor are gas drive type booster pumps, The Claim 1 thru | or 3 characterized by the above-mentioned. A high pressure gas storage system is provided.

  According to the fifth aspect of the present invention, the supply gas supplied from the gas supply source is boosted to a predetermined pressure by the low-pressure stage compressor, and then boosted to a higher pressure by the high-pressure stage compressor. A high pressure gas accumulating method for storing in the first pressure step of stopping the supply of the driving gas to the high pressure stage compressor from the start of accumulating until the pressure value in the accumulator becomes a first threshold value; After the pressure value in the pressure accumulator becomes the first threshold value, the driving gas having a lower pressure than the driving gas supplied to the low-pressure compressor is supplied to the high pressure until the second threshold value is reached. A second step of supplying to the stage compressor, and driving at a pressure equal to the driving gas supplied to the low-pressure stage compressor until the pressure accumulation is completed after the pressure value in the pressure accumulator reaches the second threshold value. A third step of supplying a working gas to the high-pressure stage compressor High pressure gas accumulator wherein the door is provided.

  The invention according to claim 6 is a high-pressure gas accumulator system that boosts the supply gas supplied from a gas supply source and stores the high-pressure supply gas in an accumulator, wherein the supply gas The gas supply source filled with the pressure, the pressure accumulator for storing the pressurized supply gas, the supply gas line provided between the gas supply source and the pressure accumulator, and the supply gas line A low-pressure stage compressor that boosts the supply gas to a predetermined pressure, and the supply gas pressure booster to a predetermined pressure that is provided on the secondary side of the low-pressure stage compressor of the supply gas line A high-pressure stage compressor that boosts the gas to a higher pressure, a first driving gas line that supplies the first driving gas to the low-pressure stage compressor, and a supply pressure that is lower than the supply pressure of the first driving gas The second driving gas of the high pressure stage A second driving gas line to be supplied to the compressor, a bypass line provided so that the first driving gas line and the second driving gas line communicate with each other, and a second driving gas line A first on-off valve that is provided, and a second on-off valve that is provided in the bypass line, and pressurizes the supply gas supplied from the gas supply source to store the high-pressure supply gas in the accumulator A method for operating a high pressure gas accumulator system for storing in a reservoir, wherein the first on-off valve and the second on-off valve are closed until the pressure value in the accumulator reaches a first threshold value from the start of pressure accumulation. And the first on-off valve is opened and the second on-off valve is closed until the second threshold value is reached after the pressure value in the pressure accumulator reaches the first threshold value. And the second step, and the pressure value in the accumulator is the second threshold value. After Tsu, until completion of the accumulator, the third step and, a method of operating a high-pressure gas pressure accumulator system, characterized in that it comprises a for the first on-off valve and the second on-off valve to the open state is provided.

  According to the high pressure gas accumulating system of the present invention, the first driving gas line for supplying the first driving gas to the low pressure compressor and the second driving gas having a lower supply pressure than the first driving gas are supplied with high pressure. A bypass line provided to communicate with a second drive gas line supplied to the stage compressor; a first on-off valve provided in the second drive gas line; and a second provided in the bypass line. And the pressure of the driving gas supplied to the high-pressure compressor can be controlled by selecting the open / close state of the first and second open / close valves. It is possible to reduce the load on the high-pressure compressor immediately after the start of pressure accumulation with a low internal pressure. Therefore, the maintenance frequency of the high-pressure compressor can be reduced, and replacement of the high-pressure compressor in a short period can be suppressed. Furthermore, since the first on-off valve and the second on-off valve used in the present invention are small in size, they can be easily installed in a conventional pressure accumulation system. Therefore, the high-pressure gas pressure accumulation system of the present invention can be easily constructed from the conventional pressure accumulation system.

  According to the high pressure gas accumulating method of the present invention, the first step of stopping the supply of the driving gas to the high pressure compressor from the start of accumulating until the pressure value in the accumulator becomes the first threshold, A first driving gas is supplied to the high-pressure stage compressor at a lower pressure than the driving gas supplied to the low-pressure stage compressor until the pressure value in the chamber reaches the second threshold value after reaching the first threshold value. Supply the driving gas with the same pressure as the driving gas supplied to the low-pressure stage compressor until the completion of the pressure accumulation after the two steps and the pressure value in the pressure accumulator reaches the second threshold value. And the third step, and when the pressure in the accumulator is low, the first step or the second step can be performed at a low speed, so the load on the high-pressure stage compressor is reduced. Can do. Therefore, the maintenance frequency of the high-pressure compressor can be reduced, and replacement of the high-pressure compressor in a short period can be suppressed.

1 is a system diagram showing a configuration of a high-pressure gas accumulation system that is an embodiment to which the present invention is applied. It is a figure for demonstrating the pressure accumulation method of the high pressure gas pressure accumulation system which is one Embodiment to which this invention is applied.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a high-pressure gas pressure accumulation system that is an embodiment to which the present invention is applied will be described in detail with reference to the drawings together with an operation method (high-pressure gas pressure accumulation method).

  In addition, in the drawings used in the following description, in order to make the features easy to understand, there are cases where the portions that become the features are enlarged for the sake of convenience, and the dimensional ratios of the respective components are not always the same as the actual ones. Absent.

First, the configuration of a high-pressure gas accumulator system that is an embodiment to which the present invention is applied will be described. FIG. 1 is a system diagram showing a configuration of a high-pressure gas accumulator system according to an embodiment to which the present invention is applied. As shown in FIG. 1, a high-pressure gas accumulator system 1 according to this embodiment includes a hydrogen gas supply source (gas supply source) 2, an accumulator 3, a supply gas line L 1, a low-pressure compressor 4, A stage compressor 5, a driving gas supply source 6, a first driving gas line L2, a second driving gas line L3, a first on-off valve 7, a bypass line L4, and a second on-off valve 8; The pressure measuring device 9 and the control unit 10 are schematically configured.

  The high pressure gas accumulator system 1 of the present embodiment boosts the hydrogen gas (supply gas) supplied from the hydrogen gas supply source 2 using the low pressure stage compressor 4 and the high pressure stage compressor 5, and enters the accumulator 3. It is a system for filling.

  In the high-pressure gas accumulator system 1, the equipment and gas lines except for a part of the hydrogen gas supply source 2, the driving gas supply source 6 and the third driving gas line L 5 are installed in the hydrogen explosion-proof area A. Yes.

  The hydrogen gas supply source 2 is a hydrogen gas supply source for supplying the pressure accumulator 3. The hydrogen gas supply source 2 is not particularly limited, and specifically, for example, a curdle or a tube trailer filled with hydrogen gas can be used.

  The pressure accumulator 3 is a container for storing hydrogen gas whose pressure has been increased by the low-pressure stage compressor 4 and the high-pressure stage compressor 5. The material of the pressure accumulator 3 is, for example, a C-FRP container, a steel container (ASME SA-723M), and the size is, for example, 200 L, 250 L, 300 L, and the like, and can store pressure up to about 100 MPaG. Although it does not specifically limit as the pressure accumulator 3, For example, a large cylinder, a curdle, etc. can be used.

  The supply gas line L1 is a pipe provided between the hydrogen gas supply source 2 and the pressure accumulator 3 for supplying hydrogen gas, and one end of the supply gas line L1 is detachably connected to the hydrogen gas supply source 2 and the other end. Is connected to the pressure accumulator 3. Although it does not specifically limit as supply gas line L1, Specifically, metal piping, a flexible tube, etc. can be used, for example. In addition, the pipe diameter of the supply gas line L1 is not particularly limited as long as hydrogen gas can be sufficiently supplied.

  The low-pressure stage compressor 4 is provided in the supply gas line L1 in order to increase the pressure of the hydrogen gas supplied from the hydrogen gas supply source 2 to a predetermined pressure (specifically, for example, 20 to 50 MPaG). . The low-pressure stage compressor 4 is not particularly limited as long as the hydrogen gas can be increased to a predetermined pressure. Here, in the high-pressure gas accumulator system 1 of the present embodiment, since hydrogen gas is used as the supply gas, it is preferable to use a gas-driven booster pump that does not ignite as the low-pressure compressor 4. With this low-pressure stage compressor 4, hydrogen gas whose pressure has been increased to a predetermined pressure can be supplied to a high-pressure stage compressor 5 provided in the subsequent stage.

  The high-pressure stage compressor 5 is used to raise the hydrogen gas, which has been pressurized to a predetermined pressure by the low-pressure stage compressor 4, to a higher pressure (specifically, for example, 50 to 100 MPaG). The high-pressure stage compressor 5 is provided on the secondary side of the low-pressure stage compressor 4 in the supply gas line L1. The high-pressure compressor 5 is not particularly limited as long as the hydrogen gas can be increased to a predetermined pressure. Here, in the high-pressure gas accumulator system 1 of the present embodiment, since hydrogen gas is used as the supply gas, it is preferable to use a gas-driven booster pump that does not ignite as the high-pressure compressor 5. By using the high-pressure stage compressor 5 connected in series with the low-pressure stage compressor 4, it is possible to easily store hydrogen gas at a higher pressure without using a compressor having a large compression capacity.

  The driving gas supply source 6 is a supply source for supplying driving gas to the low-pressure stage compressor 4 and the high-pressure stage compressor 5. Although it does not specifically limit as drive gas, Specifically, nitrogen gas, dry air, etc. can be used, for example. As the driving gas supply source 6, specifically, for example, a large air compressor or a combination of an inert gas liquefied gas storage tank and an evaporator can be used.

  The first driving gas line L <b> 2 is a pipe provided between the driving gas supply source 6 and the low pressure compressor 4 in order to supply the driving gas to the low pressure compressor 4. Specifically, one end of the first driving gas line L2 is connected to the driving gas supply source 6 via the third driving gas line L5, and the other end is a driving gas for the low-pressure compressor 4. It is connected to a supply port (not shown). Although it does not specifically limit as the 1st drive gas line L2, Specifically, metal piping, a flexible tube, etc. can be used, for example. Further, the pipe diameter of the first driving gas line L2 is not particularly limited as long as the driving gas can be sufficiently supplied, and may be any narrower size.

  The first driving gas line L2 is provided with a first pressure regulating valve 11 for controlling the supply pressure of the driving gas. Thereby, the supply pressure of the driving gas (first driving gas) on the secondary side of the first pressure regulating valve 11 can be controlled to 0.7 MPaG, for example. Therefore, 0.7 MPaG of driving gas can be supplied from the driving gas supply source 6 to the low-pressure compressor 4. Although it does not specifically limit as the 1st pressure regulation valve 11, Specifically, a pressure reducing valve etc. can be used, for example.

  The third driving gas line L5 includes a driving gas supply source 6, a low-pressure stage compressor 4, and a high-pressure stage compressor 5 for supplying driving gas to the low-pressure stage compressor 4 and the high-pressure stage compressor 5. It is the piping provided between. Specifically, one end of the third driving gas line L5 is detachably connected to the driving gas supply source 6, and the other ends are respectively connected to the first driving gas line L2 and the second driving gas line L3. Connected with. As a result, the driving gas can be supplied to each of the low-pressure compressor 4 and the high-pressure compressor 5. The third driving gas line L5 is not particularly limited, but specifically, for example, metal piping, a flexible tube, or the like can be used. Further, the pipe diameter of the third driving gas line L5 is not particularly limited as long as the driving gas can be sufficiently supplied, and may be any smaller size.

  The third driving gas line L5 is provided with a driving gas supply source valve 12 for controlling the supply of driving gas. Thus, when accumulating is started, the driving gas supply source valve 12 is opened, supply of driving gas to the low-pressure stage compressor 4 and the high-pressure stage compressor 5 is started, and when accumulating is completed. The supply of the driving gas can be stopped in the closed state. The driving gas supply source valve 12 is not particularly limited as long as it satisfies the hydrogen explosion-proof specification, and may be a gas-driven automatic valve or another type of automatic valve. There may be. Specifically, for example, a ball valve, a ball valve, or the like can be used.

  The second driving gas line L <b> 3 is a pipe provided between the driving gas supply source 6 and the high-pressure compressor 5 in order to supply the driving gas to the high-pressure compressor 5. Specifically, one end of the second drive gas line L3 is connected to the drive gas supply source 6 via the third drive gas line L5, and the other end is a drive gas for the high-pressure compressor 5. It is connected to a supply port (not shown). The second driving gas line L3 is not particularly limited, and specifically, for example, a metal pipe or a flexible tube can be used. In addition, the pipe diameter of the second driving gas line L3 is not particularly limited as long as the driving gas can be sufficiently supplied, and may be any smaller size.

  The second driving gas line L3 is provided with a second pressure regulating valve 13 for controlling the supply pressure of the driving gas. The driving gas (second driving gas) whose supply pressure is controlled by the second pressure regulating valve 13 is supplied more than the driving gas (first driving gas) whose supply pressure is controlled by the first pressure regulating valve 11. The pressure is controlled to be low. Thereby, the supply pressure of the driving gas on the secondary side of the second pressure regulating valve 13 can be controlled to 0.2 MPaG, for example. Accordingly, the driving gas of 0.2 MPaG can be supplied from the driving gas supply source 6 to the low-pressure compressor 4. Although it does not specifically limit as the 2nd pressure regulating valve 13, Specifically, a pressure reducing valve etc. can be used, for example.

  Further, in the second driving gas line L3, a first on-off valve 7 is provided on the secondary side of the second pressure regulating valve 13 in order to control the supply of driving gas. Thus, even when the driving gas supply source valve 12 is in the open state, the supply of the driving gas to the high-pressure compressor 5 can be stopped by closing the first on-off valve 7. The first on-off valve 7 is not particularly limited as long as it satisfies the hydrogen explosion-proof specification, and may be a gas-driven automatic valve, another type of automatic valve, or a manual valve. Also good. Specifically, for example, a ball valve, a ball valve, or the like can be used. The position of the first on-off valve 7 may be the primary side of the second pressure regulating valve 13 in the second driving gas line L3 without being limited to the example of the present embodiment.

  The bypass line L4 has a first driving gas line L2 and a second driving gas line L3 in order to flow a part of the first driving gas flowing through the first driving gas line L2 to the second driving gas line L3. And a pipe provided to communicate with each other. Specifically, one end of the bypass line L4 is connected to the secondary side of the first pressure regulating valve 11 in the first driving gas line L2, and the other end is connected to the second driving gas line L3. The second pressure regulating valve 13 is connected on the secondary side. Although it does not specifically limit as the bypass line L4, Specifically, metal piping, a flexible tube, etc. can be used, for example. Further, the pipe diameter of the bypass line L4 is not particularly limited as long as the driving gas can be sufficiently supplied, and may be any smaller size.

  The bypass line L4 is provided with a second on-off valve 8 for controlling the supply of driving gas. Since the first driving gas is controlled to have a higher supply pressure than the second driving gas, by opening the second on-off valve 8, a part of the first driving gas is The gas can flow to the second driving gas line L3. Therefore, when both the first on-off valve 7 and the second on-off valve 8 are open, the supply pressure of the driving gas supplied to the high pressure compressor 5 is equal to the supply pressure of the first driving gas. Become. The second on-off valve 8 is not particularly limited as long as it satisfies the hydrogen explosion-proof specification, and may be a gas-driven automatic valve, another type of automatic valve, or a manual valve. Also good. Specifically, for example, a ball valve, a ball valve, or the like can be used.

  The pressure measuring device 9 is provided in the pressure accumulator 3 in order to measure the pressure of hydrogen gas inside the pressure accumulator 3. By transmitting the measured value obtained by the pressure measuring device 9 to the control unit 10, the first on-off valve 7, the second on-off valve 8, and the driving gas are based on the pressure of the hydrogen gas inside the accumulator 3. The opening and closing of the supply source valve 12 can be controlled. Although it does not specifically limit as the pressure measuring device 9, Specifically, a pressure transmitter etc. can be used, for example.

  The control unit 10 is provided to control the opening / closing of the first on-off valve 7, the second on-off valve 8, and the driving gas supply source valve 12 based on the pressure of hydrogen gas inside the accumulator 3. The control unit 10 includes a driving gas supply source valve 12 via the first on-off valve 7 and the signal line c1, via the second on-off valve 8 and the signal line c2, and via the pressure measuring device 9 and the signal line c3. And a signal line c4. By receiving a pressure value from the pressure measuring device 9 and transmitting an opening / closing signal to the first opening / closing valve 7, the second opening / closing valve 8 and the driving gas supply source valve 12 according to the received pressure value, the opening / closing of each valve is performed. To control. Thereby, the supply pressure of the driving gas supplied to the high-pressure compressor 5 can be controlled in three stages, and the pressure can be accumulated while changing the operation state in stages according to the internal pressure of the pressure accumulator 3. Although it does not specifically limit as the control part 10, Specifically, a sequencer, PLC, etc. can be used, for example.

Next, a pressure accumulation method (that is, an operation method of the high pressure gas pressure accumulation system 1) of the high pressure gas pressure accumulation system of the present embodiment using the above-described high pressure gas pressure accumulation system 1 will be described.
The pressure accumulating method (hereinafter simply referred to as “accumulating pressure method”) of the high pressure gas accumulating system 1 of the present embodiment is obtained by increasing the hydrogen gas supplied from the hydrogen gas supply source 2 to a predetermined pressure by the low pressure compressor 4. A pressure accumulating method in which the pressure is increased to a higher pressure by the high-pressure stage compressor 5 and stored in the accumulator 3, and the driving gas supplied to the high-pressure stage compressor 5 is supplied to the first on-off valve 7 and the second on-off valve 8. By controlling the opening and closing, the pressure accumulation is divided into three steps.

  More specifically, the first step of closing the first on-off valve 7 and the second on-off valve 8 from the start of the pressure accumulation until the pressure value in the pressure accumulator 3 becomes the first threshold value, and the pressure accumulator A second step in which the first on-off valve 7 is opened and the second on-off valve 8 is closed until the second threshold value is reached after the pressure value in 3 has reached the first threshold value; 3 and a third step of opening the first on-off valve 7 and the second on-off valve 8 until the completion of pressure accumulation after the pressure value in 3 becomes the second threshold value. is there.

  The pressure accumulation method of this embodiment will be described with reference to FIG. Here, the horizontal axis of FIG. 2 shows the flow of time (process), and the vertical axis shows the pressure in the pressure accumulator 3 from the top, the open / close state of the driving gas supply source valve 12, and the first on-off valve 7. , The open / close state of the second on-off valve 8, the gas supply pressure for driving the high-pressure compressor 5, and the operating speed of the high-pressure compressor 5.

  In the following description, a gas-driven booster pump having a rated driving gas pressure of 0.7 MPaG is used as both the low-pressure stage compressor 4 and the high-pressure stage compressor 5, and the first pressure regulating valve 11 performs the first operation. The supply pressure of the driving gas (first driving gas) flowing through the secondary side of the pressure regulating valve 11 is controlled to 0.7 MPaG, and the secondary pressure side of the second pressure regulating valve 13 is controlled by the second pressure regulating valve 13. Although the case where the supply pressure of the driving gas flowing through (second driving gas) is controlled to 0.2 MPaG will be described as an example, it is not limited thereto.

As shown in FIG. 2, first, the first on-off valve 7, the second on-off valve 8, and the driving gas supply source valve 12 are all closed until time t1 is reached. In this state, since the driving gas is not supplied to the low-pressure stage compressor 4 and the high-pressure stage compressor 5, the low-pressure stage compressor 4 and the high-pressure stage compressor 5 are stopped. Therefore, pressure accumulation is not started and the pressure in the pressure accumulator 3 is constant.
In the present embodiment, both the first on-off valve 7 and the second on-off valve 8 are closed, but before the time t1, the first on-off valve 7 and the second on-off valve 8 are opened and closed, respectively. Either state is acceptable.

  Next, pressure accumulation is started by opening the driving gas supply source valve 12 at time t1. Specifically, when the control unit 10 sends an open signal to the driving gas supply source valve 12, the driving gas supply source valve 12 is opened. As a result, 0.7 MPaG of driving gas is supplied to the low-pressure compressor 4, the low-pressure compressor 4 starts to increase the pressure of hydrogen gas, and the pressure accumulation of the hydrogen gas to the pressure accumulator 3 is started. At this time, since the first on-off valve 7 and the second on-off valve 8 are all closed, the driving gas is not supplied to the high-pressure stage compressor 5, and the high-pressure stage compressor 5 remains stopped (stopped state). ). Therefore, pressure is accumulated only by the operation of the low-pressure stage compressor 4. Accumulation of pressure proceeds in this state before time t2, and a process from time t1 to time t2 is defined as a “first process”.

  When the pressure accumulation progresses and the pressure in the pressure accumulator 3 reaches 50 MPaG at time t2, the first on-off valve 7 is opened, and the operation of the high-pressure compressor 5 is also started. Specifically, the first opening / closing valve 7 is opened by the control unit 10 sending an opening signal to the first opening / closing valve 7. Thereby, since the driving gas of 0.2 MPaG is supplied to the high-pressure stage compressor 5, the high-pressure stage compressor 5 starts operation. However, since the pressure is lower than the rated driving gas pressure, the operating speed is suppressed (low speed state). Accumulation of pressure proceeds in this state until time t3, and the process from time t2 to before time t3 is defined as a “second process”.

  When the pressure accumulation further proceeds and at time t3, the internal pressure of the pressure accumulator 3 reaches 60 MPaG, the second on-off valve 8 is opened, and the operating speed of the high-pressure compressor 5 becomes a steady speed. Specifically, the second opening / closing valve 8 is opened by the control unit 10 sending an opening signal to the second opening / closing valve 8. As a result, part of the first driving gas starts to flow through the bypass line L4 to the second driving gas line L3. As a result, 0.7 MPaG of driving gas is supplied to the high-pressure compressor 5 and operation is started at a steady speed (steady speed state). Accumulation of pressure proceeds in this state until time t4, and the process from time t3 to time t4 is defined as a “third process”.

When the pressure in the pressure accumulator 3 reaches a target value (93 MPaG: normal pressure of the pressure accumulator, but not limited to 93 MPaG) at time t4, the pressure accumulation is completed. Specifically, the control unit 10 sends a close signal to the first on-off valve 7, the second on-off valve 8, and the driving gas supply source valve 12 to close all the valves. As a result, the supply of the driving gas to the low-pressure stage compressor 4 and the high-pressure stage compressor 5 is stopped, and the supply pressure of the driving gas becomes zero, so that the low-pressure stage compressor 4 and the high-pressure stage compressor 5 are operated. Is stopped and pressure accumulation is completed. As a result, hydrogen gas whose pressure has been increased to 93 MPaG is stored in the pressure accumulator 3.
In the present embodiment, both the first on-off valve 7 and the second on-off valve 8 are closed. However, after the time t4, the first on-off valve 7 and the second on-off valve 8 are in an open / closed state. But you can.

  Therefore, the hydrogen gas boosted to 93 MPaG can be stored in the pressure accumulator 3 by the pressure accumulation method of the present embodiment.

  As described above, according to the high pressure gas accumulating system 1 of the present embodiment, the first driving gas line L2 for supplying the first driving gas to the low pressure compressor 4 is supplied more than the first driving gas. A bypass line L4 provided so as to communicate with a second drive gas line L3 for supplying the second drive gas having a low pressure to the high-pressure compressor 5 is provided, and provided in the second drive gas line L3. The first on-off valve 7, the second on-off valve 8 provided on the bypass line L4, the driving gas supply source valve 12 provided on the third driving gas line L5, and the pressure measurement provided on the pressure accumulator 3 The control unit 10 includes a first on-off valve 7, a second on-off valve 8, and a control unit 10 based on the pressure in the accumulator 3 measured by the pressure measuring unit 9. By controlling the open / closed state of the driving gas supply source valve 12, high It is possible to control the supply pressure of the drive gas supplied to the stage compressor 5, it is possible to reduce the load of the high-pressure compressor 5 immediately after the pressure is low pressure accumulation starts in the accumulator 3. Therefore, the maintenance frequency of the high-pressure stage compressor 5 can be reduced, and replacement of the high-pressure stage compressor 5 in a short period can be suppressed.

  For example, if the controller 10 is designed so that the pressure value in the pressure accumulator 3 measured by the pressure measuring device 9 is periodically received even after the pressure accumulation is completed, for example, in the pressure accumulator 3 When the pressure value falls below a certain threshold value, the accumulator 3 is automatically started by automatically opening the driving gas supply source valve 12 and the pressure in the accumulator 3 is always kept above a certain level. Is possible.

  Furthermore, the first on-off valve 7 and the second on-off valve 8 used in the present embodiment are selected to be smaller than the first pressure adjustment valve 11 and the second pressure adjustment valve 13, so that a conventional pressure accumulating system is obtained. It can be installed easily. Therefore, the high-pressure gas pressure accumulation system of the present invention can be easily constructed from the conventional pressure accumulation system.

  Next, according to the high pressure gas accumulating method of the present embodiment, by stopping the supply of the driving gas to the high pressure compressor 5 from the start of accumulating until the pressure value in the accumulator 3 becomes 50 MPaG, Supplying 0.2 MPaG of driving gas to the high-pressure stage compressor 5 until the first step of setting the operation speed to “stopped state” and the pressure value in the pressure accumulator 3 becomes 50 MPaG to 60 MPaG. Thus, the second step of setting the operating speed of the high-pressure compressor 5 to the “low-speed state” and the pressure value in the pressure accumulator 3 after the pressure value in the pressure accumulator 3 reaches 60 MPaG until the pressure accumulation is completed, And a third step of setting the operating speed of the high-pressure stage compressor 5 to the “steady speed state” by supplying the driving gas of FIG. Set the operating speed to `` Stopped state '' and the pressure builds up Once By a "low speed state", to prevent excessive speed operation, it is possible to reduce the load of the high-pressure compressor 5. Therefore, the maintenance frequency of the high-pressure stage compressor 5 can be reduced, and replacement of the high-pressure stage compressor 5 in a short period can be suppressed.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention. For example, in the above-described embodiment, an example in which hydrogen gas is used as the supply gas has been described. However, the present invention is not limited to this. Specifically, for example, any gas may be used as long as the gas can be stored in the pressure accumulator.

  The high-pressure gas storage system and the high-pressure gas storage method of the present invention can be applied to a hydrogen gas station for a hydrogen automobile.

1 ... High pressure gas storage system 2 ... Hydrogen gas supply source (gas supply source)
DESCRIPTION OF SYMBOLS 3 ... Accumulator 4 ... Low pressure stage compressor 5 ... High pressure stage compressor 6 ... Gas supply source for drive 7 ... 1st on-off valve 8 ... 2nd on-off valve 9 ... Pressure measuring device 10 ... Control part 11 ... 1st pressure adjustment Valve 12 ... Drive gas supply source valve 13 ... Second pressure regulating valve L1 ... Supply gas line L2 ... First drive gas line L3 ... Second drive gas line L4 ... Bypass line L5 ... Third drive gas line c1, c2, c3, c4 ... signal line A ... hydrogen explosion-proof area

Claims (6)

A gas supply source filled with supply gas;
A pressure accumulator for storing the pressurized supply gas;
A gas line for supply provided between the gas supply source and the pressure accumulator;
A low-pressure stage compressor provided in the supply gas line to increase the supply gas to a predetermined pressure;
A high-pressure stage compressor that is provided on the secondary side of the low-pressure stage compressor of the supply gas line and pressurizes the supply gas that has been pressurized to a predetermined pressure to a higher pressure;
A first driving gas line for supplying a first driving gas to the low-pressure stage compressor;
A second driving gas line for supplying a second driving gas to the high-pressure compressor,
A high-pressure gas accumulator system that boosts the supply gas supplied from the gas supply source and stores the high-pressure supply gas in the accumulator,
A bypass line provided so that the first driving gas line and the second driving gas line communicate with each other;
A first on-off valve provided in the second driving gas line;
A second on-off valve provided in the bypass line,
The high pressure gas storage system, wherein a supply pressure of the second driving gas is lower than a supply pressure of the first driving gas. A control unit for controlling opening and closing of the first on-off valve and the second on-off valve;
A pressure measuring instrument for measuring the pressure of the gas accumulated in the accumulator,
The high-pressure gas accumulation system according to claim 1, wherein the control unit controls opening and closing of the first on-off valve and the second on-off valve based on the pressure measured by the pressure measuring device.   The high-pressure gas accumulation system according to claim 1, wherein the supply gas is hydrogen gas.   The high-pressure gas storage system according to any one of claims 1 to 3, wherein the low-pressure stage compressor and the high-pressure stage compressor are gas-driven booster pumps. A high-pressure gas accumulating method for boosting a supply gas supplied from a gas supply source to a predetermined pressure by a low-pressure compressor and then increasing the pressure to a higher pressure by a high-pressure compressor and storing it in an accumulator,
A first step of stopping the supply of driving gas to the high-pressure stage compressor from the start of pressure accumulation until the pressure value in the pressure accumulator becomes a first threshold value;
After the pressure value in the accumulator reaches the first threshold value, the driving gas having a lower pressure than the driving gas supplied to the low pressure stage compressor is supplied to the high pressure stage until the second threshold value is reached. A second step of supplying to the compressor;
After the pressure value in the pressure accumulator becomes the second threshold value, the driving gas having the same pressure as the driving gas supplied to the low-pressure stage compressor is supplied to the high-pressure stage compressor until the pressure accumulation is completed. A high-pressure gas accumulating method comprising: a third step. A high-pressure gas accumulator system that boosts a supply gas supplied from a gas supply source and stores the high-pressure supply gas in an accumulator,
The gas supply source filled with the supply gas;
The pressure accumulator for storing the pressurized supply gas;
A gas line for supply provided between the gas supply source and the pressure accumulator;
A low-pressure stage compressor provided in the supply gas line to increase the supply gas to a predetermined pressure;
A high-pressure stage compressor that is provided on the secondary side of the low-pressure stage compressor of the supply gas line and pressurizes the supply gas that has been pressurized to a predetermined pressure to a higher pressure;
A first driving gas line for supplying a first driving gas to the low-pressure stage compressor;
A second drive gas line for supplying a second drive gas having a supply pressure lower than a supply pressure of the first drive gas to the high-pressure compressor;
A bypass line provided so that the first driving gas line and the second driving gas line communicate with each other;
A first on-off valve provided in the second driving gas line;
A second on-off valve provided in the bypass line,
A method of operating a high-pressure gas accumulator system that boosts the supply gas supplied from the gas supply source and stores the high-pressure supply gas in the accumulator,
A first step of closing the first on-off valve and the second on-off valve from the start of pressure accumulation until the pressure value in the pressure accumulator becomes a first threshold;
A second step of opening the first on-off valve and closing the second on-off valve until the pressure value in the pressure accumulator becomes the second threshold after the first threshold is reached; ,
And a third step of opening the first on-off valve and the second on-off valve until the completion of pressure accumulation after the pressure value in the pressure accumulator becomes the second threshold value. To operate the high pressure gas storage system.

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