JP6385305B2 - Hydrogen station - Google Patents

Description

  The present invention relates to a hydrogen station, and in particular, a compression means for filling a hydrogen storage container (hydrogen trailer, curdle, etc.) into a hydrogen storage container, and filling from a hydrogen storage container to a pressure accumulator for a dispenser. It is related with the hydrogen station provided with the compression means.

Patent Document 1 discloses a hydrogen station including a multi-stage hydrogen compressor, particularly a variable-stage compressor in which the number of compression stages is variable by selectively allowing hydrogen before compression to be supplied to an intermediate stage. .
And in the hydrogen station disclosed in Patent Document 1, when compressing the hydrogen from the hydrogen generator or hydrogen curdle and supplying it to the pressure accumulator for the dispenser, when compressing the low-pressure hydrogen from the hydrogen generator, When hydrogen is supplied to the first stage of the multi-stage compressor and medium-pressure hydrogen from the hydrogen curdle is compressed, the hydrogen is supplied to the intermediate stage of the multi-stage compressor, thereby compressing in a variable stage.

JP 2007-263245 A

  By the way, hydrogen supplied from a hydrogen transport container such as a hydrogen trailer or a curdle is compressed and filled into a hydrogen storage container, and the hydrogen supplied from the hydrogen storage container is compressed and filled into a pressure accumulator for a dispenser. In the hydrogen station, a compressor is required for filling the hydrogen storage container and for filling the pressure accumulator, respectively, which increases the equipment cost.

  In view of such a situation, the present invention uses a variable stage compressor as described in Patent Document 1 and performs filling of a hydrogen storage container and filling of a pressure accumulator with a single variable stage compressor. It is a first object to provide a hydrogen station that can be used.

  Further, the conventional hydrogen station is provided with a pressure reducing valve for reducing the pressure of hydrogen to about 0.6 MPa, for example, between the compressor and the container in the preceding stage. This is because the number of compression stages is set so that compression is possible to the required pressure even if hydrogen is discharged until the inside of the container in the front stage of the compressor becomes extremely low pressure in order to improve the operation efficiency of hydrogen. This is because the pressure on the inlet side of the compressor is reduced so that overcompression does not occur when the pressure in the previous vessel is high. However, the compression cost (power consumption for driving the compressor) increases due to the compression to the required pressure.

  In order to cope with such a problem, the present invention constructs a system that enables optimum control of the compressor in response to a change (decrease) in the pressure in the vessel in front of the compressor at the hydrogen station. This is a second problem.

In order to solve the first problem, in the present invention, the first compression means for compressing the hydrogen supplied from the hydrogen transport container and filling the hydrogen storage container and the hydrogen storage container are supplied. And a second compression unit that compresses hydrogen into a pressure accumulator for a dispenser, and the first and second compression units have a plurality of compression stages and the number of compression stages is variable. A single variable stage compressor, and the hydrogen transport container is connected to the inlet side of the variable stage compressor so as to use the variable stage compressor as the first compression means, and the variable stage compression is performed. A first connection configuration in which the hydrogen storage container is piped to the outlet side of the machine, and the variable stage compressor is used on the inlet side of the variable stage compressor so as to use the variable stage compressor as the second compression means. Connect the hydrogen storage container by piping, A connection switching device capable of selectively switching the second connection configuration in which the pressure accumulator is pipe-connected to the outlet side of the variable-stage compressor, and includes the first connection configuration and the first connection configuration. 2, the number of compression stages of the variable stage compressor is changed.
Specifically, in the first connection form, the number of compression stages of the variable stage compressor is made smaller than that in the second connection form.

  In order to solve the second problem, in the present invention, the first and second compression means include a first pressure detection device that detects a pressure in the hydrogen transport container, and the hydrogen storage. And a second pressure detecting device for detecting the pressure in the container, and the number of compression stages of the variable stage compressor when used as the first compression means is changed according to the pressure in the hydrogen transport container. A first compression stage number control device and a second compression stage number control device that changes the number of compression stages of the variable stage compressor when used as the second compression means according to the pressure in the hydrogen storage container. And further comprising. Specifically, the higher the pressure, the smaller the number of compression stages, and the greater the pressure, the larger the number of compression stages.

  According to the present invention, the filling from the hydrogen transport container to the hydrogen storage container and the filling from the hydrogen storage container to the pressure accumulator can be covered by a single compressor, and compression suitable for each is provided. Compression can be performed by the number of stages, and the equipment cost can be reduced.

  Also, by detecting the pressure in the container at the front stage of the compressor and controlling the number of compression stages accordingly, when the pressure is high, the number of compression stages is reduced to reduce the compression cost. When the pressure decreases, the number of compression stages can be increased to ensure the required filling pressure, and optimal compressor control is possible.

System diagram of a hydrogen station showing a first embodiment of the present invention System diagram of a hydrogen station showing a second embodiment of the present invention System diagram of a hydrogen station showing a third embodiment of the present invention

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a system diagram of a hydrogen station showing a first embodiment of the present invention.

  Hydrogen is carried into the hydrogen station of the present embodiment from the outside using a hydrogen transport container. Examples of the hydrogen transport container include a self-propelled hydrogen trailer in which large cylinders are bundled and mounted, or a hydrogen curdle in which small cylinders (cylinders) that are transported and unloaded by vehicles are bundled. It is not particularly limited. However, in the following description, it demonstrates as what uses the hydrogen trailer 1 for convenience.

  The hydrogen station of this embodiment stores hydrogen supplied from the hydrogen trailer 1 at an intermediate pressure (for example, 45 MPa), and has a large-capacity hydrogen storage container (hereinafter simply referred to as “storage container”) 2 as a whole. And an accumulator 3 having a small capacity as a whole and accumulating high-pressure (for example, 82 MPa) hydrogen supplied to the fuel cell vehicle (FCV) 5 by the dispenser 4.

When the hydrogen trailer 1 arrives at the storage container 2, the hydrogen supplied from the hydrogen trailer 1 is compressed and filled.
The pressure accumulator 3 is compressed and filled with hydrogen supplied from the storage container 2 every time the dispenser 4 fills the FCV 5 or whenever a predetermined amount of hydrogen in the pressure accumulator 3 is consumed.
Here, a single variable stage compressor 6 is used for compressing and filling the storage container 2 and compressing and filling the accumulator 3.

The variable stage compressor 6 has a plurality of reciprocating compression stages (first to fifth cylinders in this embodiment) and the number of compression stages is variable.
Specifically, the variable-stage compressor 6 has first to fifth cylinders 11 to 15 radially in the radial direction around the center crank-type rotary drive unit 10, and each cylinder 11 to 15 has a crank. And a reciprocating piston (not shown) driven by the crankshaft of the rotary drive unit 10. A pump chamber (not shown) is formed between the cylinder head of each cylinder 11 to 15 and the piston, and suction ports a1 to a5 and discharge ports b1 to b5 are provided in each pump chamber. A one-way valve (not shown) is attached to each of the suction ports a1 to a5 and the discharge ports b1 to b5.

Then, the discharge ports b1 to b4 of the front cylinders 11 to 14 and the suction ports a2 to a5 of the rear cylinders 12 to 15 are connected by communication passages c1 to c4 to constitute a five-stage compressor. .
The five-stage compressor sucks hydrogen from the suction port a1 of the first cylinder 11, compresses it in five stages, and discharges it from the discharge port b5 of the fifth cylinder 15.

On the other hand, a switching valve d2 is provided in the communication path c1 to the suction port a2 of the second cylinder 12 and the four-stage suction path e2 is connected, so that a four-stage compressor can be configured.
When the compressor is used as a four-stage compressor, hydrogen is sucked from the suction port a2 of the second cylinder 12 using the four-stage suction passage e2 and the switching valve d2, and compressed in the four stages. From the discharge port b5. In this case, for the compression stage (first cylinder 11) that is not used, the suction side and the discharge side may be communicated so as to further reduce the load.

  In other words, the variable stage compressor 6 is configured so that hydrogen before compression can be selectively sucked into the first cylinder 11 that is the first compression stage, or the second cylinder 12 that is subsequent thereto. Variable stage (5-stage compressor and 4-stage compressor) is realized.

Here, a four-stage intake passage e2 connected to the intake port a2 of the second cylinder 12 of the variable-stage compressor 6 via a switching valve d2 is connected in order from the inlet side to the coupling 20 for connection with the hydrogen trailer 1. The on-off valve 21 and the pressure reducing valve 22 are provided.
Accordingly, the hydrogen trailer 1 is connected to the four-stage intake passage e <b> 2 (the intake port a <b> 2 of the second cylinder 12) of the variable stage compressor 6 through the on-off valve 21 and the pressure reducing valve 22. The decompression pressure of the decompression valve 22 is set to 0.6 MPa, for example.

  The outlet side of the storage container 2 is connected to the suction port a1 of the first cylinder 11 of the variable stage compressor 6 via the on-off valve 23 and the pressure reducing valve 24. The decompression pressure of the decompression valve 24 is set to 0.6 MPa, for example.

  The outlet pipe from the discharge port b5 of the fifth cylinder 15 which is the final compression stage of the variable stage compressor 6 branches into two, one of which is the inlet of the storage container 2 via the on-off valve 25 and the pressure reducing valve 26. The other side is connected to the inlet side of the pressure accumulator 3 via the on-off valve 27 and the pressure reducing valve 28. The decompression pressure of the decompression valve 26 is set to 45 MPa, for example, according to the required pressure of the storage container 2. The decompression pressure of the decompression valve 28 is set to 82 MPa, for example, according to the required pressure of the accumulator 3.

The on-off valves 21, 23, 25, 27 and the switching valve d2 are controlled by the control device 30.
The control device 30 opens the on-off valves 21 and 25 and causes the switching valve d2 to communicate with the suction passage e2 for the fourth stage and the suction port a2 of the second cylinder 12 when compressing and filling the storage container 2 from the hydrogen trailer 1. Switch to position. At this time, the on-off valves 23 and 27 are kept closed.
The control device 30 also opens the on-off valves 23 and 27 at the time of compression and filling from the storage container 2 to the pressure accumulator 3, and switches the switching valve d2 between the discharge port b1 of the first cylinder 11 and the suction port a2 of the second cylinder 12. Switch to the position where is connected. At this time, the on-off valves 21 and 25 are kept closed.

Therefore, the on-off valves 21 and 25 and the on-off valves 23 and 27 are provided with hydrogen trailers on the inlet side of the variable stage compressor 6 so that the variable stage compressor 6 is used as the first compression means for filling the storage container 2. 1 is connected to the outlet and the storage container 2 is connected to the outlet side of the variable stage compressor 6, and the variable stage compressor 6 is used as the second compression means for filling the pressure accumulator 3. As described above, the second connection configuration in which the storage container 2 is connected to the inlet side of the variable stage compressor 6 and the accumulator 3 is connected to the outlet side of the variable stage compressor 6 can be selectively switched. It corresponds to a connection switching device.
Further, the number of compression stages of the variable stage compressor 6 is changed between the first connection form and the second connection form. Specifically, in the first connection form, the number of compression stages of the variable stage compressor 6 is made smaller than that in the second connection form.

Next, the operation of the first embodiment will be described.
When the hydrogen trailer 1 arrives, the hydrogen trailer 1 is connected to the coupling 20 for unloading. At this time, the on / off valves 21 and 25 are opened by the control device 30, and the switching valve d2 is switched to a position where the four-stage suction passage e2 and the suction port a2 of the second cylinder 12 communicate with each other. The on-off valves 23 and 27 are closed.

  At this time, the hydrogen in the hydrogen trailer 1 is sucked into the second cylinder 12 of the variable stage compressor 6 through the switching valve d2 after being depressurized to 0.6 MPa by the pressure reducing valve 22 through the on-off valve 21. The Thereby, hydrogen is compressed in four stages by the second to fifth cylinders 12 to 15. For example, if the compression ratio per stage is 3.0, it is 81 times in 4 stages and the pressure is increased from 0.6 MPa to 48.6 MPa.

  The hydrogen discharged from the discharge port b5 of the fifth cylinder 15 of the variable stage compressor 6 is reduced to, for example, 45 MPa by the pressure reducing valve 26 through the opening / closing valve 25 and then filled into the storage container 2.

  When the intermediate pressure hydrogen stored in the storage container 2 is made high and stored in the pressure accumulator 3, the control device 30 opens the on-off valves 23 and 27, and the switching valve d2 is discharged from the first cylinder 11. The port b1 and the suction port a2 of the second cylinder 12 are switched to a communicating position. The on-off valves 21 and 25 are closed.

  At this time, the hydrogen in the storage container 2 is sucked into the first cylinder 11 of the variable stage compressor 6 after being decompressed to 0.6 MPa by the pressure reducing valve 24 through the on-off valve 23. Thereby, hydrogen is compressed in five stages by the first to fifth cylinders 11 to 15. For example, when the compression ratio per stage is 3.0, the pressure is increased by 243 times in 5 stages and increased from 0.6 MPa to 145.8 MPa.

The hydrogen discharged from the discharge port b5 of the fifth cylinder 15 of the variable stage compressor 6 is reduced to, for example, 82 MPa by the pressure reducing valve 28 through the on-off valve 27 and then filled in the pressure accumulator 3.
The high-pressure hydrogen accumulated in the accumulator 3 is appropriately filled into the FCV 5 by the dispenser 4.

  According to the present embodiment, the filling from the hydrogen trailer 1 to the storage container 2 and the filling from the storage container 2 to the pressure accumulator 3 can be covered by one compressor 6 and are suitable for each. The compression can be performed with the number of compression stages, and the equipment cost can be reduced.

  Further, in the present embodiment, the inlet side request of the variable stage compressor 6 is required for each of the inlet pipe from the hydrogen trailer 1 to the variable stage compressor 6 and the inlet pipe from the storage container 2 to the variable stage compressor 6. There are pressure reducing valves 22 and 24 in which the pressure reducing pressure is set according to the pressure. Thereby, although compression cost increases, hydrogen can be fully discharged from the hydrogen trailer 1 and the storage container 2, and the operation efficiency of hydrogen improves.

  Further, in the present embodiment, the storage container 2 and the pressure accumulator 3 are respectively connected to the outlet pipe from the variable stage compressor 6 to the storage container 2 and the outlet pipe from the variable stage compressor 6 to the pressure accumulator 3. There are pressure reducing valves 26 and 28 in which the pressure reducing pressure is set according to the required pressure. Thereby, the required pressure of the storage container 2 and the pressure accumulator 3 can be reliably realized.

  FIG. 2 is a system diagram of a hydrogen station showing a second embodiment of the present invention. In FIG. 2, the same elements as those in FIG. 1 are denoted by the same reference numerals, description thereof is omitted, and different elements are described.

In the present embodiment, a four-stage compressor can be configured by providing a switching valve f4 in the communication path c4 from the discharge port b4 of the fourth cylinder 14 of the compressor 6 and connecting the four-stage discharge path g4. It is said.
When used as a four-stage compressor, hydrogen is sucked from the suction port a1 of the first cylinder 11, compressed in four stages, and discharged from the discharge port b4 of the fourth cylinder 14 to the switching valve f4 and the four-stage discharge. It discharges using the passage g4.

  In other words, the variable stage compressor 6 of the present embodiment is configured so that the compressed hydrogen can be selectively discharged from the fifth cylinder 15 as the final compression stage or the fourth cylinder 14 at the preceding stage. This realizes a variable stage (5-stage compressor and 4-stage compressor).

Here, the inlet piping to the suction port a1 of the first cylinder 11 of the variable stage compressor 6 is branched into two, and one of the branch passages is connected to the hydrogen trailer 1 in order from the inlet side. A ring 20, an on-off valve 21, and a pressure reducing valve 22 are provided.
Accordingly, the hydrogen trailer 1 is connected to the suction port a1 of the first cylinder 11 of the variable stage compressor 6 via the on-off valve 21 and the pressure reducing valve 22. The decompression pressure of the decompression valve 22 is set to 0.6 MPa, for example.

  The outlet side of the storage container 2 is connected to the other branch passage of the inlet pipe to the suction port a <b> 1 of the first cylinder 11 of the variable stage compressor 6 via the opening / closing valve 23 and the pressure reducing valve 24. The decompression pressure of the decompression valve 24 is set to 0.6 MPa, for example.

A four-stage discharge passage g4 connected to the discharge port b4 of the fourth cylinder 14 of the variable-stage compressor 6 via the switching valve f4 is connected to the inlet side of the storage container 2 via the on-off valve 25 and the pressure reducing valve 26. Is done. The decompression pressure of the decompression valve 26 is set to 45 MPa, for example, according to the required pressure of the storage container 2.
The outlet pipe from the discharge port b5 of the fifth cylinder 15 of the variable stage compressor 6 is connected to the inlet side of the pressure accumulator 3 via the on-off valve 27 and the pressure reducing valve 28. The decompression pressure of the decompression valve 28 is set to 82 MPa, for example, according to the required pressure of the accumulator 3.

The on-off valves 21, 23, 25, 27 and the switching valve f4 are controlled by the control device 30.
The control device 30 opens the on-off valves 21 and 25 and causes the switching valve f4 to communicate with the discharge port b4 of the fourth cylinder 14 and the four-stage discharge passage g4 at the time of compression filling from the hydrogen trailer 1 to the storage container 2. Switch to position. At this time, the on-off valves 23 and 27 are kept closed.
The control device 30 also opens the on-off valves 23 and 27 and compresses the switching valve f4 at the discharge port b4 of the fourth cylinder 14 and the suction port a5 of the fifth cylinder 15 at the time of compression filling from the storage container 2 to the pressure accumulator 3. Switch to the position where is connected. At this time, the on-off valves 21 and 25 are kept closed.

Next, the operation of the second embodiment will be described.
When the hydrogen trailer 1 arrives, the hydrogen trailer 1 is connected to the coupling 20 for unloading. At this time, the control device 30 opens the on-off valves 21 and 25, and the switching valve f4 is switched to a position where the discharge port b4 of the fourth cylinder 14 communicates with the four-stage discharge passage g4. The on-off valves 23 and 27 are closed.

  At this time, the hydrogen in the hydrogen trailer 1 is sucked into the first cylinder 11 of the variable stage compressor 6 after being decompressed to 0.6 MPa by the pressure reducing valve 22 through the on-off valve 21. Thereby, hydrogen is compressed in four stages by the first to fourth cylinders 11 to 14.

  The hydrogen discharged from the discharge port b4 of the fourth cylinder 14 of the variable stage compressor 6 is reduced in pressure to, for example, 45 MPa by the pressure reducing valve 26 through the switching valve f4, the four-stage discharge passage g4, and the opening / closing valve 25, The storage container 2 is filled.

  When the intermediate pressure hydrogen stored in the storage container 2 is made high and accumulated in the accumulator 3, the control device 30 opens the on-off valves 23 and 27, and the switching valve f4 is discharged from the fourth cylinder 14. The position is switched to a position where the port b4 and the suction port a5 of the fifth cylinder 15 communicate with each other. The on-off valves 21 and 25 are closed.

  At this time, the hydrogen in the storage container 2 is sucked into the first cylinder 11 of the variable stage compressor 6 after being decompressed to 0.6 MPa by the pressure reducing valve 24 through the on-off valve 23. Thereby, hydrogen is compressed in five stages by the first to fifth cylinders 11 to 15.

The hydrogen discharged from the discharge port b5 of the fifth cylinder 15 of the variable stage compressor 6 is reduced to, for example, 82 MPa by the pressure reducing valve 28 through the on-off valve 27 and then filled in the pressure accumulator 3.
The high-pressure hydrogen accumulated in the accumulator 3 is appropriately filled into the FCV 5 by the dispenser 4.

  According to the second embodiment, substantially the same effect as the first embodiment can be obtained.

  FIG. 3 is a system diagram of a hydrogen station showing a third embodiment of the present invention. In FIG. 3, the same elements as those in FIG. 1 are denoted by the same reference numerals, description thereof is omitted, and different elements are described.

In the present embodiment, a four-stage compressor can be configured by providing a switching valve d2 in the communication path c1 to the suction port a2 of the second cylinder 12 of the compressor 6 and connecting the four-stage suction path e2. It is said.
Further, a switching valve d3 is provided in the communication path c2 to the suction port a3 of the third cylinder 13 of the compressor 6 and the three-stage suction path e3 is connected, so that a three-stage compressor can be configured.
In addition, a switching valve d4 is provided in the communication path c3 to the suction port a4 of the fourth cylinder 14 of the compressor 6 and the two-stage suction path e4 is connected, whereby a two-stage compressor can be configured.
Further, a switching valve d5 is provided in the communication path c4 to the suction port a5 of the fifth cylinder 14 of the compressor 6 and the first-stage suction path e5 is connected, whereby a one-stage compressor can be configured.

  In other words, the variable-stage compressor 6 can selectively suck hydrogen before compression into the first cylinder 11 that is the first compression stage or the second to fifth cylinders 12 to 15 that are later than the first compression stage. By configuring, a variable stage (5-stage compressor to 1-stage compressor) is realized.

Here, in the hydrogen passage from the coupling 20 for connection with the hydrogen trailer 1, a pressure sensor 31 and an on-off valve 21 are provided in this order from the coupling 20 side, and there are four downstreams in this example. The on / off valves 42 to 45 and the pressure reducing valves 52 to 55 are respectively provided. One of the on-off valves 42 to 45 is selectively opened when the on-off valve 21 is opened.
And the downstream side of each pressure-reduction valve 52-55 (each on-off valve 42-45) is connected to the suction ports a2-a5 of the 2nd-5th cylinders 12-15 of the variable stage compressor 6 via the switching valves d2-d5. Connected to the four-stage to first-stage suction passages e2 to e5 (or one of the branch paths).
The pressure reducing pressure of the pressure reducing valve 52 is set to 0.6 MPa, the pressure reducing pressure of the pressure reducing valve 53 is set to 1.8 MPa, the pressure reducing pressure of the pressure reducing valve 54 is set to 5.4 MPa, and the pressure reducing pressure of the pressure reducing valve 55 is set to 16.2 MPa, for example. The However, the pressure reducing valves 52 to 55 can be omitted.

A pressure sensor 32 and an opening / closing valve 23 are provided in this order on the outlet side of the storage container 2, and these downstream sides are branched into three in this example, and the opening / closing valves 61 to 63 and the pressure reducing valves 71 to 71 are respectively provided. 73 is provided. One of the on-off valves 61 to 63 is selectively opened when the on-off valve 23 is opened.
The downstream side of the pressure reducing valve 71 (open / close valve 61) is directly connected to the suction port a1 of the first cylinder 11 of the variable stage compressor 6. The downstream side of the pressure reducing valves 72, 73 (open / close valves 62, 63) , Connected to the other branch of the four- and three-stage intake passages e2 and e3 connected to the suction ports a2 and a3 of the second and third cylinders 12 and 13 of the variable-stage compressor 6 via the switching valves d2 and d3. Has been.
The pressure reducing pressure of the pressure reducing valve 71 is set to 0.6 MPa, the pressure reducing pressure of the pressure reducing valve 72 is set to 1.8 MPa, for example, and the pressure reducing pressure of the pressure reducing valve 73 is set to 5.4 MPa, for example. However, the pressure reducing valves 71 to 73 can be omitted.

  The outlet pipe from the discharge port b5 of the fifth cylinder 15 which is the final compression stage of the variable stage compressor 6 branches into two, one of which is the inlet of the storage container 2 via the on-off valve 25 and the pressure reducing valve 26. The other side is connected to the inlet side of the pressure accumulator 3 via the on-off valve 27 and the pressure reducing valve 28. The decompression pressure of the decompression valve 26 is set to 45 MPa, for example, according to the required pressure of the storage container 2. The decompression pressure of the decompression valve 28 is set to 82 MPa, for example, according to the required pressure of the accumulator 3.

The on-off valves 21, 23, 25, 27, 42 to 45, 61 to 63 and the switching valves d2 to d5 are controlled by the control device 30.
The pressure sensor 31 detects the pressure of hydrogen in the hydrogen trailer 1 as a first pressure detection device. The pressure sensor 32 detects the pressure of hydrogen in the storage container 2 as a second pressure detection device. Detection signals from these pressure sensors 31 and 32 are input to the control device 30.

The control device 30 opens the on-off valves 21 and 25 when compressing and filling the storage container 2 from the hydrogen trailer 1, and sets a target 45 MPa according to the hydrogen pressure in the hydrogen trailer 1 detected by the pressure sensor 31. The number of compression stages is determined so as to obtain the pressure after compression, and any one of the on-off valves 42 to 45 is selectively opened. At the same time as the on-off valves 42 to 45 are selectively opened, the corresponding switching valves d2 to d5 are selectively switched. At this time, the on-off valves 23 and 27 are kept closed.
The control device 30 also opens the on-off valves 23 and 27 and compresses the target according to the hydrogen pressure in the storage container 2 detected by the pressure sensor 32 during compression filling from the storage container 2 to the pressure accumulator 3. In order to obtain a pressure after compression of 82 MPa or more, the number of compression stages is determined, and any one of the on-off valves 61 to 63 is selectively opened. When the on-off valve 62 or 63 is opened, the corresponding switching valve d2 or d3 is selectively switched at the same time. At this time, the on-off valves 21 and 25 are kept closed.

  Therefore, the on-off valves 21 and 25 and the on-off valves 23 and 27 are provided with hydrogen trailers on the inlet side of the variable stage compressor 6 so that the variable stage compressor 6 is used as the first compression means for filling the storage container 2. 1 is connected to the outlet and the storage container 2 is connected to the outlet side of the variable stage compressor 6, and the variable stage compressor 6 is used as the second compression means for filling the pressure accumulator 3. As described above, the second connection configuration in which the storage container 2 is connected to the inlet side of the variable stage compressor 6 and the accumulator 3 is connected to the outlet side of the variable stage compressor 6 can be selectively switched. It corresponds to a connection switching device.

The on-off valves 42 to 45 correspond to a first compression stage number control device that changes the number of compression stages of the variable stage compressor 6 when used as the first compression means according to the pressure in the hydrogen trailer 1.
The on-off valves 71 to 73 correspond to a second compression stage number control device that changes the number of compression stages of the variable stage compressor 6 when used as the second compression means according to the pressure in the storage container 2. .

Next, the operation of the third embodiment will be described.
When the hydrogen trailer 1 arrives, the hydrogen trailer 1 is connected to the coupling 20 for unloading. At this time, the control device 30 opens the on-off valves 21 and 25. The on-off valves 23 and 27 are closed.
Further, the control device 30 detects the pressure in the hydrogen trailer 1 based on the signal of the pressure sensor 31, and according to this, any one of the on-off valves 42 to 45 is selectively opened. Further, the corresponding switching valves d2 to d5 are selectively switched.

  At this time, the hydrogen in the hydrogen trailer 1 passes through any one of the on-off valves 42 to 45 from the on-off valve 21 and further through the corresponding switching valves d2 to d5, and the second to second of the variable stage compressor 6. It is sucked into any one of the fifth cylinders 12-15. Thus, when hydrogen is sucked into the second cylinder 12, it is four stages, when it is sucked into the third cylinder 13, it is three stages, when it is sucked into the fourth cylinder 14, it is two stages, and the fifth cylinder When it is inhaled into 15, it is compressed in one stage.

  Thus, when the pressure in the hydrogen trailer 1 is high, for example, the on-off valve 45 or 44 is opened and compressed in one or two stages, and the pressure in the hydrogen trailer 1 is discharged as the hydrogen in the hydrogen trailer 1 is discharged. Is lowered, for example, the on-off valve 43 or 42 is opened and compressed in three or four stages. Thereby, irrespective of the pressure change in the hydrogen trailer 1, the target compression pressure of 45 MPa or more is obtained.

  The hydrogen discharged from the discharge port b5 of the fifth cylinder 15 of the variable stage compressor 6 is reduced to, for example, 45 MPa by the pressure reducing valve 26 through the opening / closing valve 25 and then filled into the storage container 2.

When the intermediate pressure hydrogen stored in the storage container 2 is made high and stored in the pressure accumulator 3, the control device 30 opens the on-off valves 23 and 27. The on-off valves 21 and 25 are closed.
Further, the control device 30 detects the pressure in the storage container 2 based on the signal from the pressure sensor 32, and according to this, any one of the on-off valves 61 to 63 is selectively opened. When the on-off valve 62 or 63 is opened, the corresponding switching valve d2 or d3 is switched.

  At this time, the hydrogen in the storage container 2 passes through any one of the on-off valves 61 to 63 from the on-off valve 23 and further through the corresponding switching valves d2 and d3 (however, the selection of the on-off valve 62 or 63 is selected). Only) and is sucked into one of the first to third cylinders 11 to 13 of the variable stage compressor 6. Thus, hydrogen is compressed in five stages when sucked into the first cylinder 11, in four stages when sucked into the second cylinder 12, and compressed in three stages when sucked into the third cylinder 13. .

Thus, when the pressure in the storage container 2 is high, for example, the on-off valve 63 is opened and compressed in three stages. As the hydrogen in the storage container 2 is discharged, the pressure in the storage container 2 gradually increases. When the pressure drops, for example, the on-off valve 62 is opened and compressed in four stages, and further, for example, the on-off valve 61 is opened and compressed in five stages. Thereby, the target compression pressure of 82 MPa or more is obtained irrespective of the pressure change in the storage container 2.

The hydrogen discharged from the discharge port b5 of the fifth cylinder 15 of the variable stage compressor 6 is reduced to, for example, 82 MPa by the pressure reducing valve 28 through the on-off valve 27 and then filled in the pressure accumulator 3.
The high-pressure hydrogen accumulated in the accumulator 3 is appropriately filled into the FCV 5 by the dispenser 4.

According to the third embodiment, when compressing and filling the storage container 2 from the hydrogen trailer 1, by detecting the pressure in the hydrogen trailer 1 and controlling the number of compression stages accordingly, when the pressure is high, When the number of compression stages is reduced to reduce the compression cost, and when the pressure is reduced by dispensing, the number of compression stages can be increased to ensure the required filling pressure.
In addition, the pressure in the storage container 2 is detected during compression filling from the storage container 2 to the pressure accumulator 3, and the number of compression stages is reduced when the pressure is high by controlling the number of compression stages accordingly. Thus, when the compression cost is reduced and the pressure is reduced by dispensing, the number of compression stages can be increased to ensure the required filling pressure.
Moreover, even if it uses the pressure reducing valves 42-45 and 71-73 in the front | former stage of the compressor 6, since it is for adjustment and does not perform large pressure reduction, an energy loss can be reduced.

In the third embodiment (FIG. 3), it is possible to switch from four stages to one stage when compressing and filling the storage container 2 from the hydrogen trailer 1, and five stages when compressing and filling the storage container 2 to the pressure accumulator 3. Although it is possible to switch to ~ 3 stages, this is due to the restriction shown in the figure, and it is possible to switch from 5 stages to 1 stage at any compression filling.
Further, in the third embodiment (FIG. 3), when the number of compression stages is reduced, hydrogen before compression is sucked into the subsequent stage from the first compression stage (first cylinder 11), as in the first embodiment (FIG. 1). However, as in the second embodiment (FIG. 2), the compressed hydrogen may be discharged from the stage before the final compression stage (fifth cylinder 15).

  The illustrated embodiments are merely examples of the present invention, and the present invention includes various improvements and modifications made by those skilled in the art within the scope of the claims in addition to those directly illustrated by the described embodiments. Needless to say, it is included.

1 Hydrogen trailer (transport container)
2 Storage container 3 Accumulator 4 Dispenser 5 Fuel cell vehicle (FCV)
6 Variable Stage Compressor 10 Crank Type Rotation Drive Units 11-15 Cylinders a1-a5 Suction Ports b1-b5 Discharge Ports c1-c4 Communication Paths d2-d5 Switching Valves e2-e5 Four-stage discharge passage 20 Coupling 21, 23, 25, 27 On-off valve 22, 24, 26, 28 Pressure reducing valve 30 Control device 31, 32 Pressure sensors 42-45, 62-63 On-off valves 52-55, 71-73 Pressure reducing valve

Claims (5)

A first compression means for compressing hydrogen supplied from a hydrogen transport container and filling the hydrogen storage container; and a first compression means for compressing hydrogen supplied from the hydrogen storage container and filling the dispenser pressure accumulator. A hydrogen station comprising two compression means,
The first and second compression means include
A single variable stage compressor having a plurality of compression stages and having a variable number of compression stages;
In order to use the variable stage compressor as the first compression means, the hydrogen transport container is connected to the inlet side of the variable stage compressor, and the hydrogen storage container is connected to the outlet side of the variable stage compressor. A first connection form for connecting the pipe to the container, and the hydrogen storage container is connected to the inlet side of the variable stage compressor so as to use the variable stage compressor as the second compression means; A connection switching device capable of selectively switching the second connection mode in which the pressure accumulator is pipe-connected to the outlet side of the variable stage compressor;
Provided in each of the inlet piping from the hydrogen transport container to the variable stage compressor and the inlet piping from the hydrogen storage container to the variable stage compressor, the required pressure on the inlet side of the variable stage compressor A pressure reducing valve with a pressure reducing pressure set accordingly,
Comprising
The number of compression stages of the variable stage compressor is changed between the first connection form and the second connection form . In the first connection form, the variable stage compressor is compared with the second connection form. A hydrogen station characterized in that the number of compression stages is reduced . A first compression means for compressing hydrogen supplied from a hydrogen transport container and filling the hydrogen storage container; and a first compression means for compressing hydrogen supplied from the hydrogen storage container and filling the dispenser pressure accumulator. A hydrogen station comprising two compression means,
The first and second compression means include
A single variable stage compressor having a plurality of compression stages and having a variable number of compression stages;
In order to use the variable stage compressor as the first compression means, the hydrogen transport container is connected to the inlet side of the variable stage compressor, and the hydrogen storage container is connected to the outlet side of the variable stage compressor. A first connection form for connecting the pipe to the container, and the hydrogen storage container is connected to the inlet side of the variable stage compressor so as to use the variable stage compressor as the second compression means; A connection switching device capable of selectively switching the second connection mode in which the pressure accumulator is pipe-connected to the outlet side of the variable stage compressor;
A first pressure detection device for detecting the pressure in the hydrogen transport container;
A second pressure detection device for detecting the pressure in the hydrogen storage container;
A first compression stage number control device that changes the number of compression stages of the variable stage compressor when used as the first compression means in accordance with the pressure in the hydrogen transport container;
A second compression stage number control device that changes the number of compression stages of the variable stage compressor when used as the second compression means in accordance with the pressure in the hydrogen storage container;
A hydrogen station comprising: 3. The hydrogen station according to claim 1, wherein the variable stage compressor is configured to be able to selectively suck hydrogen before compression into the first compression stage or the stage after the first compression stage. 4. 3. The hydrogen station according to claim 1, wherein the variable stage compressor is configured to be able to selectively discharge compressed hydrogen from a final compression stage or a stage before the final compression stage. 4. Depending on the required pressure of the hydrogen storage container and the pressure accumulator to the outlet pipe from the variable stage compressor to the hydrogen storage container and the outlet pipe from the variable stage compressor to the pressure accumulator, respectively. The hydrogen station according to any one of claims 1 to 4 , further comprising a pressure reducing valve in which a reduced pressure is set.

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