JP5425956B2 - Hydrogen gas supply system - Google Patents

Description

  The present invention relates to a hydrogen gas supply system that supplies hydrogen gas to a plurality of systems.

  Conventionally, for example, commercial thermal power generators use hydrogen gas cooling with high thermal conductivity and good cooling efficiency. When the portion to be cooled is cooled using hydrogen gas, carbon dioxide gas or the like is generated, so that the purity of the hydrogen gas gradually decreases. Here, since there is a possibility of explosion if the purity of the hydrogen gas is lowered in the sealed space, it is necessary to appropriately manage the purity of the hydrogen gas in the hydrogen gas cooling for safety management.

  As a method for managing the purity of hydrogen gas, for example, while supplying more hydrogen gas than usual when the purity is updated, the amount of released hydrogen gas is provided by providing an orifice in the release valve that discharges the supplied hydrogen gas. There is known a method of adjusting the above (Patent Document 1).

JP 2008-182791 A

  According to the method described in Patent Document 1, although the renewal period of the hydrogen gas purity can be shortened, there is room for further improvement. That is, when hydrogen gas cooling is performed on a plurality of generators connected to a supply system for supplying hydrogen gas, when the release valve is opened to renew the hydrogen gas purity, the supply system of another generator May be affected, and the renewal period of the hydrogen gas purity may be prolonged.

  This invention is made | formed in view of such a problem, and it aims at shortening the renewal period of hydrogen gas purity in the hydrogen supply system which supplies the hydrogen gas for cooling with respect to several system | strains.

  (1) A hydrogen supply system that supplies hydrogen gas for cooling to a plurality of generator systems, the hydrogen gas supply device storing hydrogen gas, and the hydrogen gas stored in the hydrogen gas supply device A normal hydrogen supply system that supplies a plurality of generator systems at a pressure of 1 and a hydrogen gas stored in the hydrogen gas supply device to the generator system at a second pressure higher than the first pressure. Hydrogen gas supply system for purity update to be supplied, sensor unit for measuring hydrogen gas purity in each of the plurality of generator systems, and the hydrogen gas purity measured by the sensor unit in each of the plurality of generator systems On the condition that it exceeds a predetermined value, hydrogen gas is supplied to each of the plurality of generator systems using the normal hydrogen supply system, and the hydrogen gas purity measured by the sensor unit is any of the above Departure Hydrogen gas is supplied to the generator system using the hydrogen gas supply system for renewal of purity without supplying hydrogen gas to a generator system other than the generator system, provided that it is below a predetermined value in the machine system. A hydrogen gas supply system comprising:

  (2) The plurality of generator systems are connected, and the control device releases the connection of the plurality of generator systems when supplying hydrogen gas using the hydrogen gas supply system for purity update. The hydrogen gas supply system according to (1).

  (3) When supplying the hydrogen gas using the purity renewal hydrogen gas supply system, the control device opens a purity renewal release valve provided at the lowest part of the generator system to be supplied. ) Or the hydrogen gas supply system according to (2).

  (4) When supplying the hydrogen gas using the purity update hydrogen gas supply system, the control device updates the purity on condition that the hydrogen gas pressure in the generator system to be supplied is equal to or lower than a specific value. The hydrogen gas supply system according to (3), wherein the discharge valve is closed.

  According to the present invention, when hydrogen gas purity in a plurality of generator systems is updated, hydrogen gas is supplied only to the target generator system without affecting other generator systems, The renewal period of the hydrogen gas purity can be shortened.

It is a figure which shows the hydrogen gas supply system of this invention. It is a figure which shows hydrogen gas supply at the time of normal operation, and hydrogen gas supply at the time of purity update. It is a flowchart which shows the flow of a process at the time of updating the purity of the hydrogen gas in a hydrogen gas supply system.

  Embodiments of the present invention will be described below with reference to the drawings. First, the hydrogen gas supply system 1 of the present invention will be described with reference to FIG. The hydrogen gas supply system 1 includes a hydrogen gas supply system 10 and a control device 30.

  The hydrogen gas supply system 10 is a supply system that supplies cooling hydrogen gas to the cooled parts 142 and 152 to be cooled such as a turbine shaft. The hydrogen gas supply system 11, the normal system 12, and purity An updating system 13, a primary generator system 14, and a secondary generator system 15 are included.

  The hydrogen gas supply device 11 is constituted by a cylinder or the like and stores hydrogen gas for cooling. Here, the hydrogen gas supply device 11 stores high-pressure hydrogen gas (1.8 MPa). The high-pressure hydrogen gas stored in the hydrogen gas supply device 11 flows into the normal system 12 or the purity renewal system 13 when a valve (not shown) is opened, and then is depressurized to a predetermined pressure. Supplied to the system 14 and / or the secondary generator system 15.

  When the hydrogen gas purity in the primary generator system 14 and the secondary generator system 15 is appropriate (for example, 98% or more), the normal system 12 has the primary generator system 14 and the secondary generator system 15. These are used to supply hydrogen gas to both of them, and include a normal pressure-reducing pre-valve valve 121 and a normal pressure-reducing valve 122.

  The normal pressure reducing valve 121 regulates the supply of hydrogen gas to the normal pressure reducing valve 122. That is, in the state where the normal pre-depressurization valve 121 is opened, the hydrogen gas of the hydrogen gas supply device 11 is supplied to the normal depressurization valve 122, and thereafter, the normal pressure depressurization valve 122 is depressurized to the first pressure. . On the other hand, in the state where the normal pre-depressurization valve 121 is closed, the hydrogen gas of the hydrogen gas supply device 11 is not supplied to the normal pressure reduction valve 122.

  The normal pressure reducing valve 122 reduces the high-pressure hydrogen gas supplied from the hydrogen gas supply device 11 to a first pressure (for example, 0.39 MPa). The normal pressure reducing valve 122 may be composed of a plurality of pressure reducing valves. In other words, the first pressure reducing valve for roughly reducing the high-pressure hydrogen gas and the second pressure reducing valve for finely adjusting the pressure of the roughly reduced hydrogen gas may be used.

  The purity renewal system 13 is used to supply hydrogen gas to the primary generator system 14 or the secondary generator system 15 whose hydrogen gas purity is not appropriate (for example, 97% or less). 131 and a purity renewal pressure reducing valve 132.

The purity renewal pre-reduction valve 131 regulates the supply of hydrogen gas to the purity renewal pressure reduction valve 132 in the same manner as the normal pre-reduction valve 121.
The purity renewal pressure reducing valve 132 depressurizes the high-pressure hydrogen gas supplied from the hydrogen gas supply device 11 to a second pressure (for example, 0.4 MPa). The purity renewal pressure reducing valve 132 may be constituted by a plurality of pressure reducing valves in the same manner as the normal pressure reducing valve 122.

  The primary generator system 14 is a supply system that supplies hydrogen gas for cooling to the primary generator (primary), and includes a hydrogen gas supply valve 141, a cooled portion 142, a discharge valve 143, a sensor Part 144.

  The hydrogen gas supply valve 141 regulates the supply of hydrogen gas to the primary generator system 14. That is, in a state where the hydrogen gas supply valve 141 is opened, hydrogen gas that has been decompressed to a predetermined pressure in the normal system 12 and the purity update system 13 is supplied to the primary generator system 14. On the other hand, in a state where the hydrogen gas supply valve 141 is closed, hydrogen gas from the normal system 12 and the purity update system 13 is not supplied to the primary generator system 14.

  The cooled portion 142 is a target to be cooled using hydrogen gas, and corresponds to, for example, a turbine shaft in a power generation facility. When hydrogen gas is supplied to the cooled portion 142 while the power generation facility is operating, the purity of the hydrogen gas decreases as a result of heating and heat generating carbon dioxide gas.

  The release valve 143 releases the hydrogen gas supplied to the primary generator system 14 or the generated carbon dioxide gas to the atmosphere. More specifically, the release valve 143 is opened when renewing the purity of the hydrogen gas, and releases the hydrogen gas having a reduced purity to the atmosphere. Here, the release valve 143 is preferably provided at the lowermost part of the primary generator system 14. This is because hydrogen gas has a small specific gravity and is light, so that a heavier carbon dioxide gas or the like is preferentially released into the atmosphere by providing a release valve at the lowermost part, and the renewal period of hydrogen gas purity can be shortened.

  The sensor unit 144 includes a purity sensor that measures the purity of the hydrogen gas in the primary generator system 14 and a pressure sensor that measures the pressure of the hydrogen gas in the primary generator system 14. Measurement results (hydrogen gas purity, hydrogen gas pressure) measured by the sensor unit 144 are appropriately transmitted to the control device 30.

The secondary generator system 15 is a supply system that supplies hydrogen gas for cooling to the secondary generator (secondary), and includes a hydrogen gas supply valve 151, a cooled portion 152, a discharge valve 153, a sensor Part 154.
Since the hydrogen gas supply valve 151 to the sensor unit 154 of the secondary generator system 15 are basically the same as the hydrogen gas supply valve 141 to the sensor unit 144 of the primary generator system 14, detailed description thereof is omitted. To do.

By the way, the primary generator system 14 and the secondary generator system 15 are connected as shown in FIG. The hydrogen gas supply valve 141 and the hydrogen gas supply valve 151 are also used for releasing the connection between the primary generator system 14 and the secondary generator system 15. That is, when the hydrogen gas supply valve 141 or the hydrogen gas supply valve 151 is closed, the connection between the primary generator system 14 and the secondary generator system 15 is released.
At this time, hydrogen gas from the normal system 12 and the purity update system 13 is not supplied to the primary generator system 14 or the secondary generator system 15 in which the hydrogen gas supply valves 141 and 151 are closed. Therefore, when updating the purity of the hydrogen gas, when updating the hydrogen gas supply valve of the power generation system other than the power generation system whose purity is to be updated, that is, when the purity of the hydrogen gas of the primary generator system 14 is updated. The hydrogen gas supply valve 151 of the secondary generator system 15 is closed (while the hydrogen gas supply valve 141 of the primary generator system 14 is open). In this case, although no new hydrogen gas is supplied to the secondary generator system 15, the purity and pressure of the hydrogen gas are not abruptly lowered, so the purity and pressure of the hydrogen gas are kept at appropriate values. be able to.

The control device 30 is an arithmetic device including a predetermined processing unit and a storage unit, and controls the hydrogen gas supply system 10 based on the measurement result supplied from the sensor units 144 and 154.
Here, the control of the hydrogen gas supply system 10 by the control device 30 will be described with reference to FIG. FIG. 2 (1) shows control of the hydrogen gas supply system 10 by the control device 30 during normal operation, and FIG. 2 (2) shows control of the hydrogen gas supply system 10 by the control device 30 during purity update operation. .

When the measurement results supplied from the sensor units 144 and 154 are appropriate (for example, in both the primary generator system 14 and the secondary generator system 15, the control device 30 has a hydrogen gas purity of 98% or more, hydrogen The gas pressure is 0.38 MPa or more), and the normal operation shown in FIG.
In the normal operation, the control device 30 closes the purity renewal pressure-reducing valve 131 of the purity renewal system 13 and opens the normal pressure-reduction valve 121 of the normal system 12. As a result, the high-pressure (1.8 MPa) hydrogen gas from the hydrogen gas supply device 11 is reduced to the first pressure (0.39 MPa) via the normal pressure reducing valve 122, and the primary generator systems 14 and 2 It is supplied to the next generator system 15.
At this time, the control device 30 supplies hydrogen gas to the primary generator system 14 and the secondary generator system 15 with the release valves 143 and 153 closed. Thereby, since hydrogen gas does not discharge | release to air | atmosphere, the pressure of hydrogen gas can be maintained.

On the other hand, when the measurement result supplied from the sensor units 144 and 154 is not appropriate (for example, in either the primary generator system 14 or the secondary generator system 15, the control device 30 has a hydrogen gas purity of 97% or less. ), The purity renewal operation shown in FIG. In FIG. 2 (2), the purity update operation for the primary generator system 14 is performed.
In the purity update operation, the control device 30 closes the normal pressure-reducing valve 121 of the normal system 12 while opening the purity renewal pressure-reducing valve 131 of the purity update system 13. As a result, the high-pressure (1.8 MPa) hydrogen gas from the hydrogen gas supply device 11 is reduced to the second pressure (0.4 MPa) via the purity renewal pressure reducing valve 132, and is supplied to the primary generator system 14. Supplied. Here, since the second pressure of the hydrogen gas used in the purity renewal operation is higher than the first pressure of the hydrogen gas used in the normal operation, new high-purity hydrogen gas is appropriately supplied to the primary generator system 14. Can be supplied. At this time, the control device 30 opens the release valve 143 of the primary generator system 14 in order to release the low purity hydrogen gas to the atmosphere.
Thus, in the purity renewal operation, the hydrogen gas purity renewal period is shortened in order to renew the purity of the hydrogen gas in the primary generator system 14 whose purity has been lowered by supplying hydrogen gas at a pressure higher than normal. can do. In particular, in the hydrogen gas supply system 1, since the release valve 143 is provided at the lowermost part of the primary generator system 14, it is possible to preferentially release other gases other than hydrogen gas to the atmosphere. The renewal period of purity can be shortened.

By the way, when gas is released from the release valve 143 to the atmosphere, the pressure of the hydrogen gas in the primary generator system 14 decreases. At this time, in a state in which the primary generator system 14 and the secondary generator system 15 are connected, the hydrogen gas in the secondary generator system 15 is opened with the release valve 143 in the primary generator system 14 being opened. The pressure will also decrease. In such a case, hydrogen gas must be supplied to the secondary generator system 15 to increase the pressure, leading to a prolonged renewal period of the hydrogen gas purity.
Therefore, in the purity update operation, the connection between the primary generator system 14 whose purity is to be updated and the secondary generator system 15 which is not the target of purity update is released. Specifically, the control device 30 closes the hydrogen gas supply valve 151 of the secondary generator system 15 and releases the connection between the primary generator system 14 and the secondary generator system 15. Thereby, even if the release valve 143 is opened in the primary generator system 14, the pressure of the hydrogen gas in the secondary generator system 15 is maintained.
As a result, in the purity renewal operation, it is sufficient to supply hydrogen gas only to the primary generator system 14, and the renewal period of the hydrogen gas purity can be shortened.

  The configuration of the hydrogen gas supply system 1 has been described above. Next, with reference to FIG. 3, the purity update process in the hydrogen gas supply system 1 will be described.

In step S1, the control device 30 acquires the hydrogen gas purity and the hydrogen gas pressure in the primary generator system 14 and the secondary generator system 15 based on the measurement results from the sensor units 144 and 154. Subsequently, in step S2, the control device 30 obtains an obtained hydrogen gas purity of 97% or less for each of the primary generator system 14 and the secondary generator system 15, and the obtained hydrogen gas pressure is 0. It is discriminated whether it is 38 MPa or more.
At this time, if this determination is YES in either the primary generator system 14 or the secondary generator system 15, the process proceeds to step S3. In addition, the generator system determined as YES in the processing after step S3 is the target generator system, and the other generator systems are the non-target generator systems. On the other hand, if this determination is NO in both the primary generator system 14 and the secondary generator system 15, the process is terminated. That is, the control device 30 supplies hydrogen gas to the primary generator system 14 and the secondary generator system 15 in the normal operation shown in FIG.

  When it is determined YES in step S2, control device 30 performs the purity update operation in steps S3 and S4. That is, the control device 30 closes the hydrogen gas supply valve of the non-target generator system and opens the discharge valve of the target generator system (step S3). Further, the control device 30 closes the normal pre-depressurization valve 121 and opens the purity update pre-decompression valve 131 (step S4). As a result, the target generator system is supplied with hydrogen gas at the second pressure, and after the primary generator system 14 and the secondary generator system 15 are disconnected, the target generator system is Unnecessary gas is released from the system.

  Thereafter, the control device 30 acquires the hydrogen gas purity and the hydrogen gas pressure in the target generator system. Subsequently, in step S5, the control device 30 acquires the acquired hydrogen gas purity of 98 or more, or the acquired hydrogen gas. It is determined whether or not the gas pressure is 0.375 MPa or less. When this determination is YES, the control device 30 ends the purity update process and proceeds to the process of step S6. On the other hand, when this determination is NO, control device 30 continues the purity update operation. That is, as a result of the purity renewal operation, the control device 30 causes the hydrogen gas purity in the target generator system to increase to an appropriate value, or the hydrogen gas pressure in the target generator system decreases to an inappropriate value. If this happens, the purity update operation is terminated.

  If YES is determined in step S5, the control device 30 closes the discharge valve of the target generator system and opens the hydrogen gas supply valve of the non-target generator system (step S6). Further, the control device 30 closes the purity updating pre-decompression valve 131, opens the normal pre-decompression valve 121 (step S7), and ends the process. As a result, the purity update operation shifts to the normal operation.

The hydrogen gas supply system 1 according to this embodiment has been described above. According to such a hydrogen gas supply system 1, for a generator system that is not the target for updating the hydrogen gas purity, the hydrogen gas supply valve is closed and the connection with the generator system to be updated is released. Thereby, even if the release valve is opened in the purity renewal operation, the hydrogen gas pressure of the generator system that is not the renewal target can be maintained. As a result, in the hydrogen gas supply system 1, it is not necessary to supply the hydrogen gas of the generator system that is not to be updated, the renewal period of the hydrogen gas purity can be shortened, and the hydrogen gas purity can be reduced with a small amount of hydrogen gas. Can be updated.
Further, in the purity update operation of the hydrogen gas supply system 1, hydrogen gas is supplied at a higher pressure than in the normal operation. Thereby, new high purity hydrogen gas can be supplied efficiently. Further, in the purity renewal operation of the hydrogen gas supply system 1, since the release valve provided at the lowermost part is opened, a gas having a high specific gravity with a reduced purity can be preferentially released to the atmosphere.
Further, in the hydrogen gas supply system 1, when the hydrogen gas pressure in the target generator system decreases during the purity update operation, the purity update operation is interrupted. Thereby, the hydrogen gas pressure in a generator system can be managed appropriately.

  Although the embodiments have been described above, the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

DESCRIPTION OF SYMBOLS 1 Hydrogen gas supply system 10 Hydrogen gas supply system 11 Hydrogen gas supply apparatus 12 Normal system 121 Normal pressure reduction pre-valve 122 Normal pressure reduction valve 13 Purity update system 131 Purity update pressure reduction valve 132 Purity update pressure reduction valve 14 1 Secondary generator system 15 Secondary generator system 141, 151 Hydrogen gas supply valve 142, 152 Cooled part 143, 153 Release valve 144, 154 Sensor part 30 Control device

Claims (4)

A hydrogen supply system that supplies hydrogen gas for cooling to a plurality of generator systems,
A hydrogen gas supply device for storing hydrogen gas;
A normal hydrogen supply system for supplying hydrogen gas stored in the hydrogen gas supply device to the plurality of generator systems at a first pressure;
A purity updating hydrogen gas supply system for supplying the hydrogen gas stored in the hydrogen gas supply device to the generator system at a second pressure higher than the first pressure;
A sensor unit for measuring the hydrogen gas purity in each of the plurality of generator systems;
On the condition that the hydrogen gas purity measured by the sensor unit exceeds a predetermined value in each of the plurality of generator systems, hydrogen is supplied to each of the plurality of generator systems using the normal hydrogen supply system. Supplying gas and supplying hydrogen gas to a generator system other than the generator system on the condition that the hydrogen gas purity measured by the sensor unit is not more than a predetermined value in any of the generator systems A control device for supplying hydrogen gas to the generator system using the hydrogen gas supply system for purity update,
A hydrogen gas supply system comprising: The plurality of generator systems are connected,
The control device, when supplying hydrogen gas using the hydrogen gas supply system for purity update, to disconnect the plurality of generator systems,
The hydrogen gas supply system according to claim 1. When supplying hydrogen gas using the hydrogen gas supply system for purity update, the control device opens a release valve provided at the lowest part of the generator system to be supplied,
The hydrogen gas supply system according to claim 1 or 2. When supplying hydrogen gas using the hydrogen gas supply system for purity update, the control device closes the discharge valve on condition that the hydrogen gas pressure in the generator system to be supplied is a specific value or less. ,
The hydrogen gas supply system according to claim 3.

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