JP4847052B2 - Gas-liquid separation method and apparatus - Google Patents

Description

  The present invention relates to a gas-liquid separation method for separating high-pressure hydrogen gas containing moisture into the high-pressure hydrogen gas and water, and a gas-liquid separation device used in the gas-liquid separation method.

  In recent years, hydrogen production apparatuses that produce hydrogen gas by electrolysis of water have been used. The hydrogen production apparatus includes, for example, a solid polymer membrane having catalyst electrode layers on both sides, a cathode-side power feeding body, an anode-side power feeding body provided on opposite sides of the solid polymer film, and each power feeding body. A structure including a separator stacked on each other is a single cell, and a plurality of the single cells are stacked on each other. In the hydrogen production apparatus, water is supplied to the anode side, and by supplying current to each power feeding body, the supplied water is electrolyzed in the catalyst electrode layer on the anode side of the solid polymer electrolyte membrane, and hydrogen ions, electrons To produce oxygen gas. The hydrogen ions permeate the solid polymer electrolyte membrane due to the potential difference between the anode side and the cathode side, move to the cathode side, receive electrons from the catalyst electrode layer on the cathode side, and become hydrogen gas. As a result, in the hydrogen production apparatus, high-pressure hydrogen gas can be obtained on the cathode side.

  By the way, since the hydrogen ions are accompanied by water molecules when passing through the solid polymer electrolyte membrane, the high-pressure hydrogen gas contains moisture. Therefore, when using the high-pressure hydrogen gas, it is necessary to perform gas-liquid separation to remove the moisture.

  As the high-pressure hydrogen gas-liquid separator, for example, an apparatus that introduces the high-pressure hydrogen gas obtained in the hydrogen production apparatus into a pressure-resistant vessel and separates it into high-pressure hydrogen gas and water by gravity in the pressure-resistant vessel. Are known. The gas-liquid separator is provided with a hydrogen gas outlet at the top of the pressure vessel and a drainage conduit at the bottom, and when a predetermined amount of water accumulates in the pressure vessel, the water level detection means It detects, the solenoid valve provided in this drainage pipe is opened, and the water in this pressure vessel is discharged outside from this drainage pipe (for example, refer to patent documents 1).

  However, since the high-pressure hydrogen gas is stored in the pressure vessel, when trying to discharge the water in the pressure vessel as described above, high-pressure water will be ejected vigorously from the drainage conduit, There exists a problem that there exists a possibility of damaging apparatuses, such as piping connected to the said solenoid valve and this drainage conduit | pipe. In addition, when there is no water in the pressure vessel, the high-pressure hydrogen gas leaks from the drainage conduit. Therefore, it is necessary to close the solenoid valve before all the water in the pressure vessel is discharged. However, in a state where high-pressure water is ejected vigorously from the drainage conduit, there is also a problem that it is difficult to close the solenoid valve in a timely manner because the water level fluctuates rapidly.

  In order to solve the above problem, the drainage conduit is connected to a buffer tank and drained after primary pressure reduction in the buffer tank, or the cross-sectional area of the pressure vessel is increased to moderate fluctuations in the water level. Has been done.

However, all of the above-mentioned means have the disadvantage that an increase in the size of the apparatus cannot be avoided.
JP-A-6-74033 (paragraph numbers 0011 and 0014, FIG. 1)

  The present invention provides a gas-liquid separation method that eliminates such inconveniences and can slowly discharge water separated from high-pressure hydrogen gas under reduced pressure without using a large apparatus. Objective.

  Another object of the present invention is to provide a gas-liquid separator used in the gas-liquid separation method.

  In order to achieve such an object, the first aspect of the method of the present invention is to introduce a high-pressure hydrogen gas containing moisture into a pressure-resistant vessel and separate the high-pressure hydrogen gas and water by gravity, The high-pressure hydrogen gas is taken out until the water level in the pressure vessel rises to a second predetermined water level higher than the first predetermined water level when the water level in the pressure vessel is equal to or higher than the first predetermined water level; When the water level in the pressure vessel reaches the second predetermined water level, the extraction of the high-pressure hydrogen gas is stopped, and the water in the pressure vessel is reduced until the water level in the pressure vessel drops to the first predetermined water level. In the gas-liquid separation method for discharging, a first back pressure valve that opens at a first predetermined pressure or higher to a first conduit connected to a region in which the high-pressure hydrogen gas of the pressure vessel is stored; And a solenoid valve provided on the downstream side of the back pressure valve, and water in the pressure vessel The second conduit connected to the region to be retained is provided with a second back pressure valve that opens at a second predetermined pressure higher than the first predetermined pressure, and the water level in the pressure vessel is When the predetermined water level reaches 1, the electromagnetic valve is opened and high-pressure hydrogen gas is taken out from the first conduit through the first back pressure valve, and the water level in the pressure vessel is set to the first predetermined level. When the second predetermined water level higher than the water level is reached, the solenoid valve is closed to stop taking out the high-pressure hydrogen gas until the water level in the pressure vessel drops to the first predetermined water level. The water in the pressure vessel is discharged from the second conduit through the second back pressure valve.

  The method of the first aspect includes a pressure vessel that introduces high-pressure hydrogen gas containing moisture and separates it into high-pressure hydrogen gas and water by gravity, water level detection means for detecting the water level in the pressure vessel, and When the water level in the pressure vessel detected by the water level detection means is equal to or higher than the first predetermined water level, the water level in the pressure vessel rises to a second predetermined water level higher than the first predetermined water level. Until a hydrogen extraction means for extracting high-pressure hydrogen gas from the pressure vessel, and a water level in the pressure vessel detected by the water level detection means reaches a second predetermined water level higher than the first predetermined water level. In the gas-liquid separator comprising a drainage means for discharging water from the pressure vessel until the water level in the pressure vessel drops to a first predetermined water level, the hydrogen extraction means is a high-pressure hydrogen in the pressure vessel A first lead connected to the area where the gas is stored; A first back pressure valve provided in the first conduit and opened at a pressure equal to or higher than the first predetermined pressure, and provided downstream of the first back pressure valve of the first conduit and detected by the water level detecting means When the water level in the pressure vessel detected by the water level detecting means reaches the first predetermined water level, the valve is opened, and when the water level in the pressure vessel reaches the second predetermined water level. An electromagnetic valve that closes, and the drainage means is provided in a second conduit connected to a region in which the water in the pressure-resistant container is stored, and is provided in the second conduit, and is more than a first predetermined pressure. This can be implemented by a gas-liquid separation device including a second back pressure valve that opens at a high second predetermined pressure or higher.

  In the gas-liquid separation device, the electromagnetic valve is opened when the water level in the pressure vessel detected by the water level detection means becomes a first predetermined water level that is a low water level. At this time, in the first back pressure valve provided in the first conduit and the second back pressure valve provided in the second conduit, the first back pressure valve has a lower pressure (the first back pressure valve). It is set to open at a predetermined pressure. Therefore, each time the pressure of the high-pressure hydrogen gas in the pressure-resistant container reaches the first predetermined pressure, the first back pressure valve is opened, and the high-pressure hydrogen gas is intermittently passed through the first back pressure valve, The pressure vessel is taken out from the first conduit.

  During this time, gas-liquid separation for separating moisture from the high-pressure hydrogen gas introduced into the pressure vessel is performed in the pressure vessel, and the water level in the pressure vessel gradually rises. When the water level in the pressure vessel detected by the water level detection means reaches a second predetermined water level that is a high water level, the electromagnetic valve is closed and the high-pressure hydrogen from the first conduit is closed. Gas extraction is stopped.

  Then, every time the pressure in the pressure vessel increases and reaches a second predetermined pressure that is higher than the first predetermined pressure, the second back pressure valve opens, and water in the pressure vessel is intermittently opened. Is discharged from the second conduit to the outside of the pressure vessel through the second back pressure valve. The discharge of water continues until the water level in the pressure vessel drops to a first predetermined water level that is a low water level.

  When the water level in the pressure vessel drops to the first predetermined water level, the electromagnetic valve is opened again, and the extraction of the high-pressure hydrogen gas from the first conduit is started. Repeated.

  According to the gas-liquid separator, the water in the pressure-resistant vessel is supplied by the second back pressure valve that opens at a pressure higher than the pressure at which the first back pressure valve used for taking out the high-pressure hydrogen gas opens. Since it is discharged, it can be discharged at a pressure lower than the pressure of the high-pressure hydrogen gas in the pressure vessel. Further, according to the gas-liquid separator, the water in the pressure vessel is intermittently discharged through the second back pressure valve, so that the water level can be easily controlled.

  In the second aspect of the method of the present invention, high-pressure hydrogen gas containing moisture is introduced into a pressure-resistant vessel and separated into the high-pressure hydrogen gas and water by gravity, and the water level in the pressure-resistant vessel is the first level. The high pressure hydrogen gas is taken out until the water level in the pressure vessel rises to a second predetermined water level higher than the first predetermined water level, and the water level in the pressure vessel is A gas-liquid separation method that stops taking out the high-pressure hydrogen gas when the second predetermined water level is reached and discharges the water in the pressure vessel until the water level in the pressure vessel drops to the first predetermined water level. In the pressure vessel, the first conduit connected to the region where the high-pressure hydrogen gas is stored is provided with a back pressure valve that opens at a predetermined pressure or higher, and connected to the region where the water in the pressure vessel is stored. The second conduit is provided with a throttle part and downstream of the throttle part A magnetic valve, and when the water level in the pressure vessel reaches a first predetermined water level, the solenoid valve is closed and high-pressure hydrogen gas is taken out from the first conduit via the back pressure valve. When the water level in the pressure vessel reaches a second predetermined water level higher than the first predetermined water level, the solenoid valve is opened to stop taking out high-pressure hydrogen gas, and the water level in the pressure vessel is Until the water level drops to the first predetermined water level, the water in the pressure vessel is discharged from the second conduit through the throttle.

  The method of the second aspect includes a pressure vessel that introduces high-pressure hydrogen gas containing moisture and separates it into high-pressure hydrogen gas and water by gravity, water level detection means that detects the water level in the pressure vessel, and When the water level in the pressure vessel detected by the water level detection means is equal to or higher than the first predetermined water level, the water level in the pressure vessel rises to a second predetermined water level higher than the first predetermined water level. Until when the hydrogen extraction means for extracting high-pressure hydrogen from the pressure vessel and the water level in the pressure vessel detected by the water level detection means has reached a second predetermined water level higher than the first predetermined water level, In the gas-liquid separator comprising a drain means for discharging water from the pressure vessel until the water level in the pressure vessel drops to a first predetermined water level, the hydrogen extraction means is a high-pressure hydrogen gas in the pressure vessel A first conduit connected to an area where A back pressure valve that is provided in the first conduit and opens at a pressure equal to or higher than a predetermined pressure, and the discharge means includes a second conduit connected to a region in which the water in the pressure vessel is stored, and a second conduit And a throttle part provided on the downstream side of the throttle part of the second conduit, and opened when the water level in the pressure vessel detected by the water level detecting means reaches a second predetermined water level. The gas-liquid separator includes a solenoid valve that is closed when the water level in the pressure-resistant vessel is lowered to the first predetermined water level.

  In the gas-liquid separation device, the electromagnetic valve is closed when the water level in the pressure-resistant container detected by the water level detection means falls to a first predetermined water level that is a low water level. When the solenoid valve is closed, the pressure in the pressure-resistant container increases, so that whenever a predetermined pressure is reached, the back pressure valve provided in the first conduit is opened, and the high-pressure hydrogen gas is intermittently transferred to the pressure valve. The pressure vessel is taken out from the first conduit through a back pressure valve.

  During this time, gas-liquid separation for separating moisture from the high-pressure hydrogen gas introduced into the pressure vessel is performed in the pressure vessel, and the water level in the pressure vessel gradually rises. When the water level in the pressure vessel detected by the water level detection means reaches a second predetermined water level that is a high water level, the electromagnetic valve is opened, and the water in the pressure vessel is It begins to drain from the conduit. At this time, the second conduit is provided with a throttle portion on the upstream side of the electromagnetic valve. Therefore, the water is discharged through the throttle, and the pressure is reduced and the flow rate is limited. On the other hand, when the water in the pressure vessel is discharged, the pressure in the pressure vessel is lowered, so that the back pressure valve is closed and the extraction of the high-pressure hydrogen gas from the first conduit is stopped.

  The discharge of water continues until the water level in the pressure vessel drops to a first predetermined water level that is a low water level. When the water level in the pressure vessel drops to the first predetermined water level, the solenoid valve is closed again, the extraction of the high-pressure hydrogen gas from the first conduit is started, and the above operation is repeated. It is.

  According to the gas-liquid separator, the water in the pressure vessel is discharged through the throttling portion, so that it can be discharged at a pressure lower than the pressure of the high-pressure hydrogen gas in the pressure vessel. Further, according to the gas-liquid separation device, the flow rate of the water in the pressure vessel is limited by the throttling portion, so that the fluctuation of the water level becomes gentle, and the water level can be easily controlled.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is an explanatory cross-sectional view showing a schematic configuration of the gas-liquid separation device of the present embodiment, FIG. 2 is an explanatory cross-section showing the configuration of the first aspect of the gas-liquid separation device of the present embodiment, and FIG. It is explanatory drawing which shows the structure of the 2nd aspect of the gas-liquid separation apparatus of a form.

  The gas-liquid separator of this embodiment shown in FIG. 1 is used to separate high-pressure hydrogen gas containing moisture produced by the hydrogen production apparatus 1 into high-pressure hydrogen gas and water.

  The hydrogen production apparatus 1 includes a solid polymer electrolyte membrane 2, cathode-side power feeders 3, anode-side power feeders 4 provided opposite to each other, and cathode sides stacked on the power feeders 3, 4, respectively. The unit cell 7 includes a separator 5 and an anode-side separator 6. In the hydrogen production apparatus 1, for example, two single cells 7 and 7 are stacked to form a two-layer stack. In the single cells 7, the anode separator 6 of the other single cell 7 is laminated on the cathode separator 5 of the single cell 7.

  In each single cell 7, the cathode-side separator 5 includes a fluid passage 8 in which the cathode-side power feeder 3 is exposed, and a hydrogen outlet 9 that communicates with the fluid passage 8. The anode-side separator 6 includes the anode-side power feeder 4. Are exposed to the fluid passage 10, a water supply port 11 communicating with one end of the fluid passage 10, and a drain port 12 communicating with the other end of the fluid passage 10.

  The single cells 7 and 7 are sandwiched between end plates 14 and 14 via insulating members 13 and 13 on both sides, and are fastened by bolts 15 and nuts 16 attached to the end plates 14 and 14. It is attached and fixed to.

  The hydrogen outlet 9, the water inlet 11, and the drain 12 are all provided between the single cells 7 and 7, and are provided through the insulating member 13 and the end plate 14.

In the hydrogen production apparatus 1, the solid polymer electrolyte membrane 2 is a cation permeable membrane. For example, Nafion (registered trademark, manufactured by DuPont), Aciplex (trade name, manufactured by Asahi Kasei Co., Ltd.), or the like can be used. The solid polymer electrolyte membrane 2 includes an electrode catalyst layer (not shown) containing, for example, a RuIrFeO _X catalyst on the anode side, and an electrode catalyst layer (not shown) containing, for example, a platinum catalyst, on the cathode side. .

  In the hydrogen production apparatus 1, water is supplied from the water supply port 11 to the fluid passage 10 of the anode separator 6, and the cathode side feeder 3 and the anode side feeder 4 are connected via the cathode side separator 5 and the anode side separator 6. The water is electrolyzed by energizing each of them. According to the electrolysis, water supplied from the fluid passage 10 is electrolyzed by the catalyst electrode layer on the anode side of the solid polymer electrolyte membrane 2 to generate hydrogen ions, electrons, and oxygen gas. The hydrogen ions permeate the solid polymer electrolyte membrane 2 with water molecules and move to the cathode side, receive electrons from the catalyst electrode layer on the cathode side, and become hydrogen gas. The hydrogen gas moves to the fluid passage 8 of the cathode separator 5 through the cathode power feeder 3.

  Here, since the hydrogen ions permeate the solid polymer electrolyte membrane 2 due to the potential difference between the anode side and the cathode side and move to the cathode side, a high-pressure hydrogen gas of 36 MPa, for example, is obtained in the fluid passage 8. Further, as described above, since the hydrogen ions are accompanied by water molecules when passing through the solid polymer electrolyte membrane 2, the high-pressure hydrogen gas obtained in the fluid passage 8 contains moisture.

  The high-pressure hydrogen gas containing moisture is taken out from the hydrogen outlet 9 and introduced into the gas-liquid separator 18 through the hydrogen conduit 17. Note that water containing oxygen gas generated on the anode side of the solid polymer electrolyte membrane 2 is taken out from the drain port 12.

  In the gas-liquid separator 18, the high-pressure hydrogen gas containing moisture is separated into high-pressure hydrogen gas and water by gravity. The high-pressure hydrogen gas from which the moisture has been removed is taken out from the gas-liquid separator 18 by the hydrogen take-out means 19, and the water is discharged by the drain means 20.

  As the gas-liquid separator 18 of the present embodiment, the gas-liquid separator 18a of the first mode shown in FIG. 2 or the gas-liquid separator 18b of the second mode shown in FIG. 3 can be used.

  As shown in FIG. 2, the gas-liquid separation device 18a of the first aspect of the present embodiment includes a pressure vessel 21 to which the hydrogen conduit 17 is connected, a water level sensor 22 that detects the water level in the pressure vessel 21, A hydrogen extraction conduit 23 as the hydrogen extraction means 19 connected to the ceiling portion of the pressure vessel 21 and a drainage conduit 24 as the drainage means 20 connected to the bottom of the pressure vessel 21 are provided. The hydrogen extraction conduit 23 is provided with a first back pressure valve 25, an electromagnetic valve 26 is provided on the downstream side of the first back pressure valve 25, and the discharge conduit 24 is provided with a second back pressure valve 27. It has been.

  The first back pressure valve 25 is set to open at, for example, 35 MPa, and the second back pressure valve 27 is set to be higher in pressure than the first back pressure valve 25, for example, at 36 MPa. The electromagnetic valve 26 operates in response to a detection signal from the water level sensor 22 and opens when the water level detected by the water level sensor 22 reaches a predetermined low water level and closes when the water level reaches a predetermined high water level. .

  Next, the operation of the gas-liquid separator 18a will be described.

  In the gas-liquid separation device 18a, the high-pressure hydrogen gas containing water produced by the hydrogen production device 1 is introduced into the pressure vessel 21 through the hydrogen conduit 17, and the high-pressure hydrogen gas and the liquid are separated by gravity in the pressure vessel 21. Separated into water. At this time, in order to prevent the high-pressure hydrogen gas from which the moisture has been removed from leaking from the discharge conduit 24, water is supplied in advance to the predetermined low water level, and the water level is reduced to the water level. When the sensor 22 detects, the electromagnetic valve 26 is opened. As a result, the high-pressure hydrogen gas is stored at the top of the pressure-resistant vessel 21 and the liquid water is stored at the bottom.

  When the electromagnetic valve 26 is opened, the first back pressure valve 25 is set to open at 35 MPa, which is lower than the second back pressure valve 27. Accordingly, the first back pressure valve 25 is opened every time the pressure in the pressure vessel 21 reaches 35 MPa, and the high-pressure hydrogen gas from which the moisture has been removed is intermittently supplied from the hydrogen extraction conduit 23 via the first back pressure valve 25. To be taken out. At this time, the second back pressure valve 27 is closed.

  As described above, while the high-pressure hydrogen gas from which moisture has been removed is taken out, the high-pressure hydrogen gas containing moisture introduced through the hydrogen conduit 17 is converted into high-pressure hydrogen gas and moisture in the pressure-resistant vessel 21. The gas-liquid separation is continued, and the water level in the pressure vessel 21 gradually rises. When the water level sensor 22 detects that the water level in the pressure vessel 21 has reached a predetermined high water level, the electromagnetic valve 26 is closed.

  When the solenoid valve 26 is closed, the extraction of the high-pressure hydrogen gas from the hydrogen extraction conduit 23 is forcibly stopped, so that the pressure in the pressure-resistant vessel 21 exceeds 35 MPa, which is the set pressure of the first back pressure valve 25. Become higher. As a result, the second back pressure valve 27 opens each time the pressure in the pressure vessel 21 reaches its set pressure of 36 MPa, and liquid water is intermittently discharged from the drainage conduit 24 via the second back pressure valve 27. Discharged. The discharge of the liquid water is continued until the water level in the pressure vessel 21 drops to a predetermined low water level. When the water level sensor 22 detects that the water level in the pressure vessel 21 has reached a predetermined low water level, the electromagnetic valve 26 is opened and the above-described operation is repeated.

  As shown in FIG. 3, the gas-liquid separation device 18 b of the second aspect of the present embodiment is provided with a back pressure valve 28 instead of the first back pressure valve 25 and the electromagnetic valve 26 in the hydrogen extraction conduit 23. The exhaust conduit 24 has the same configuration as that of the gas-liquid separator 18a shown in FIG. 2 except that a throttle portion 29 and an electromagnetic valve 30 are provided instead of the second back pressure valve 27. Yes.

  The back pressure valve 28 is set to open at 35 MPa, for example.

  The throttle unit 29 may be an orifice or an adjusting valve such as a needle valve. When the throttle portion 29 is an orifice, for example, by setting the orifice diameter to about 0.4 mm with respect to the inner diameter of 1/4 inch (0.6 cm) of the discharge conduit 34, the amount of drainage is 20 ml / second with a differential pressure of 35 MPa. It can be. Further, when the throttle portion 29 is an adjustment valve, an adjustment valve such as a needle valve having a Cv value of 0.005 can be used.

  The solenoid valve 30 is disposed on the downstream side of the throttle portion 29 in the discharge conduit 24. The electromagnetic valve 30 operates in response to a detection signal from the water level sensor 22 and opens when the water level detected by the water level sensor 22 is high, and closes when the water level is low.

  In the gas-liquid separator 18b, an integrated electromagnetic valve having a throttle structure may be used instead of the throttle portion 29 and the electromagnetic valve 30.

  Next, the operation of the gas-liquid separator 18b will be described.

  In the gas-liquid separator 18b, the high-pressure hydrogen gas containing water produced by the hydrogen production apparatus 1 is introduced into the pressure vessel 21 through the hydrogen conduit 17, and the high-pressure hydrogen gas and liquid are separated by gravity in the pressure vessel 21. Separated into water. At this time, in order to prevent the high-pressure hydrogen gas from which the moisture has been removed from leaking from the discharge conduit 24, water is supplied in advance to the predetermined low water level, and the water level is reduced to the water level. The electromagnetic valve 30 is closed by detecting the sensor 22. As a result, the high-pressure hydrogen gas is stored at the top of the pressure-resistant vessel 21 and the liquid water is stored at the bottom.

  Since the back pressure valve 28 is set to open at 35 MPa when the solenoid valve 30 is closed, the valve is opened each time the pressure in the pressure vessel 21 reaches 35 MPa, and the water is removed. High-pressure hydrogen gas is intermittently extracted from the hydrogen extraction conduit 23 via the back pressure valve 28.

  As described above, while the high-pressure hydrogen gas from which moisture has been removed is taken out, the high-pressure hydrogen gas containing moisture introduced through the hydrogen conduit 17 is converted into high-pressure hydrogen gas and moisture in the pressure-resistant vessel 21. The gas-liquid separation is continued, and the water level in the pressure vessel 21 gradually rises. When the water level sensor 22 detects that the water level in the pressure vessel 21 has reached a predetermined high water level, the electromagnetic valve 30 is opened, and the liquid water stored in the pressure vessel 21 is discharged from the discharge conduit. 24 is discharged.

  At this time, the liquid water in the pressure vessel 21 is discharged through the throttle 29, so that the pressure is reduced and the flow rate is limited. Therefore, the solenoid valve 30 disposed on the downstream side of the throttle portion 29 is not damaged by the ejection of high-pressure water. On the other hand, when the liquid water in the pressure vessel 21 is discharged as described above, the pressure in the pressure vessel 21 is reduced, so the back pressure valve 28 is closed and the high-pressure hydrogen gas is discharged from the hydrogen extraction conduit 23. Will not be removed.

  The discharge of the liquid water is continued until the water level in the pressure vessel 21 drops to a predetermined low water level. When the water level sensor 22 detects that the water level in the pressure vessel 21 has reached a predetermined low water level, the electromagnetic valve 30 is closed and the above-described operation is repeated.

The explanatory section which shows the schematic structure of the gas-liquid separation device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Explanatory cross section which shows the structure of the 1st aspect of the gas-liquid separator of this invention. Explanatory cross section which shows the structure of the 2nd aspect of the gas-liquid separator of this invention.

Explanation of symbols

  18 (a, b): gas-liquid separator, 21: pressure vessel, 22: water level detecting means, 23: first conduit, 24: second conduit, 25: first back pressure valve, 26: solenoid valve, 27 ... Second back pressure valve, 28 ... Back pressure valve, 29 ... Throttle part, 30 ... Solenoid valve.

Claims (4)

When the high-pressure hydrogen gas containing moisture is introduced into the pressure-resistant container and separated into the high-pressure hydrogen gas and water by gravity, and the water level in the pressure-resistant container is equal to or higher than the first predetermined water level, the pressure-resistant container The high pressure hydrogen gas is taken out until the water level in the pressure rises to a second predetermined water level higher than the first predetermined water level, and when the water level in the pressure vessel reaches the second predetermined water level, In the gas-liquid separation method of stopping the gas extraction and discharging the water in the pressure vessel until the water level in the pressure vessel drops to the first predetermined water level,
A first back pressure valve that opens at a pressure equal to or higher than a first predetermined pressure and a downstream side of the first back pressure valve are provided in a first conduit connected to a region where high pressure hydrogen gas is stored in the pressure vessel. And a second conduit connected to a region where water in the pressure vessel is stored is opened at a second predetermined pressure higher than the first predetermined pressure. With two back pressure valves,
When the water level in the pressure vessel becomes the first predetermined water level, the solenoid valve is opened to take out high-pressure hydrogen gas from the first conduit via the first back pressure valve;
When the water level in the pressure vessel reaches a second predetermined water level higher than the first predetermined water level, the solenoid valve is closed to stop taking out high-pressure hydrogen gas, and the water level in the pressure vessel is A gas-liquid separation method, wherein water in the pressure vessel is discharged from the second conduit through the second back pressure valve until the first predetermined water level is lowered. When the high-pressure hydrogen gas containing moisture is introduced into the pressure-resistant container and separated into the high-pressure hydrogen gas and water by gravity, and the water level in the pressure-resistant container is equal to or higher than the first predetermined water level, the pressure-resistant container The high pressure hydrogen gas is taken out until the water level in the pressure rises to a second predetermined water level higher than the first predetermined water level, and when the water level in the pressure vessel reaches the second predetermined water level, In the gas-liquid separation method of stopping the gas extraction and discharging the water in the pressure vessel until the water level in the pressure vessel drops to the first predetermined water level,
The first conduit connected to the region where the high-pressure hydrogen gas of the pressure vessel is stored is provided with a back pressure valve which opens at a predetermined pressure or more, and is connected to the region where the water of the pressure vessel is stored. The second conduit includes a throttle part and a solenoid valve provided on the downstream side of the throttle part,
When the water level in the pressure vessel reaches a first predetermined water level, high-pressure hydrogen gas is taken out from the first conduit via the back pressure valve,
When the water level in the pressure vessel reaches a second predetermined water level higher than the first predetermined water level, the electromagnetic valve is opened to stop taking out high-pressure hydrogen gas, and the water level in the pressure vessel is A gas-liquid separation method characterized in that water in the pressure vessel is discharged from the second conduit through the throttle until the water level drops to a first predetermined water level. A pressure vessel that introduces high-pressure hydrogen gas containing moisture and separates it into high-pressure hydrogen gas and water by gravity;
Water level detection means for detecting the water level in the pressure vessel;
When the water level in the pressure vessel detected by the water level detection means is equal to or higher than the first predetermined water level, the water level in the pressure vessel rises to a second predetermined water level higher than the first predetermined water level. A hydrogen extraction means for extracting high-pressure hydrogen gas from the pressure vessel until
When the water level in the pressure vessel detected by the water level detection means reaches a second predetermined water level that is higher than the first predetermined water level, the water level in the pressure vessel drops to the first predetermined water level. In the gas-liquid separator comprising the drainage means for discharging water from the pressure vessel,
The hydrogen extraction means includes a first conduit connected to a region where high pressure hydrogen gas is stored in the pressure vessel,
A first back pressure valve provided in the first conduit and opening at a first predetermined pressure or higher;
Provided at the downstream side of the first back pressure valve of the first conduit and opens when the water level in the pressure vessel detected by the water level detecting means reaches a first predetermined water level, and the pressure vessel An electromagnetic valve that closes when the water level in the inside reaches a second predetermined water level,
The drainage means includes a second conduit connected to a region where water in the pressure vessel is stored;
A gas-liquid separation device comprising: a second back pressure valve provided in the second conduit and opened at a second predetermined pressure higher than the first predetermined pressure. A pressure vessel that introduces high-pressure hydrogen gas containing moisture and separates it into high-pressure hydrogen gas and water by gravity;
Water level detection means for detecting the water level in the pressure vessel;
When the water level in the pressure vessel detected by the water level detection means is equal to or higher than the first predetermined water level, the water level in the pressure vessel rises to a second predetermined water level higher than the first predetermined water level. Hydrogen extracting means for extracting high-pressure hydrogen from the pressure vessel until
When the water level in the pressure vessel detected by the water level detection means reaches a second predetermined water level that is higher than the first predetermined water level, the water level in the pressure vessel drops to the first predetermined water level. In the gas-liquid separator comprising the drainage means for discharging water from the pressure vessel,
The hydrogen extraction means includes a first conduit connected to a region where high pressure hydrogen gas is stored in the pressure vessel,
A back pressure valve provided in the first conduit and opened at a predetermined pressure or higher,
The discharge means includes a second conduit connected to a region where water in the pressure vessel is stored;
A throttle provided in the second conduit;
Provided on the downstream side of the throttle portion of the second conduit, and opens when the water level in the pressure vessel detected by the water level detection means reaches a second predetermined water level, A gas-liquid separator comprising a solenoid valve that closes when the water level drops to a first predetermined water level.

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