JP2014073923A - Hydrogen purification system and hydrogen feeding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydrogen purification system in which the miniaturization of the whole of a hydrogen feeding system can be achieved, and the hydrogen feeding system.SOLUTION: The hydrogen purification system 120 comprises: a compressor 21 making a hydrogen-containing gas into a high pressure state; and a cooler 23 making the hydrogen-containing gas into a cool state. The hydrogen-containing gas is made into the cool state by the coolant 23 after made in to the high pressure state by the compressor 21, thus is made into a state where the gas can be fed to FCV 30 as the feed destination of the external part of the system. Further, a gas-liquid separator 24 performs the gas-liquid separation of the hydrogen-containing gas in either state of the high pressure state by the compressor 21 or the cool state by the coolant 23, thus can increase the purity of the hydrogen-containing gas. In this way, the compressor 21 and the cooler 23 required for hydrogen feed obviate a separately provided personal apparatus or reduces the same to refine hydrogen, and the miniaturization of the whole of the system can be achieved.

Description

  The present invention relates to a hydrogen purification system that purifies hydrogen from a hydrogen-containing gas, and a hydrogen supply system that supplies hydrogen.

  As a conventional hydrogen supply system, for example, one disclosed in Patent Document 1 is known. The hydrogen supply system of Patent Document 1 is obtained by a tank for storing a raw material aromatic hydrocarbon hydride, a reactor for obtaining hydrogen by dehydrogenating a raw material supplied from the tank, and a reactor. A gas-liquid separator that separates hydrogen into gas and liquid, and purification means that purifies the gas-liquid separated hydrogen by membrane separation. Here, as a method for purifying hydrogen in the hydrogen supply system, in addition to a method using a hydrogen separation membrane as shown in Patent Document 1, a method using PSA (Pressure Swing Adsorption) or TSA (Temperature Swing Adsorption) is known. ing.

JP 2006-232607 A

  As described above, the conventional hydrogen supply system requires a hydrogen purification unit using a hydrogen separation membrane, PSA, TSA, or the like for further purifying the hydrogen gas-liquid separated. Further, for example, in order to supply purified hydrogen to a fuel cell vehicle (FCV), a compression unit for bringing hydrogen into a high pressure state, a cooling unit for bringing hydrogen into a cooling state, or the like may be required. is there. Here, in recent years, with the widespread use of hydrogen, it has been required to further reduce the size of the hydrogen supply system.

  Then, an object of this invention is to provide the hydrogen purification system and hydrogen supply system which can achieve size reduction of the whole hydrogen supply system.

  A hydrogen purification system according to the present invention is a hydrogen purification system for purifying hydrogen from a hydrogen-containing gas produced by a hydrogen generation system, wherein a compression unit that brings the hydrogen-containing gas into a high-pressure state, and a hydrogen-containing gas in a cooled state A cooling portion that is connected to the compression portion on the downstream side of the compression portion, passes through the cooling portion, and flows a hydrogen-containing gas, and contains hydrogen that is at least one of a high pressure state and a cooling state A gas-liquid separation unit that separates gas into liquid.

  When purified hydrogen is supplied to a supply destination outside the system, it is necessary to supply the hydrogen in a cooled state after setting the hydrogen to a high pressure state. On the other hand, when the hydrogen-containing gas before purification is in at least one of a high temperature state and a cooled state, gas-liquid separation can be performed efficiently, and the hydrogen purity of the hydrogen-containing gas can be increased. Here, the hydrogen purification system according to the present invention is connected to the compression unit for bringing the hydrogen-containing gas into a high-pressure state, the cooling unit for bringing the hydrogen-containing gas into a cooling state, and connected to the compression unit on the downstream side of the compression unit and cooled. A first flow path through which the hydrogen-containing gas flows. Accordingly, the hydrogen-containing gas flowing through the first flow path is brought into a state where it can be supplied to a supply destination outside the system by being brought into a high pressure state by the compression unit and then being cooled by the cooling unit. Furthermore, the gas-liquid separation unit can increase the purity of the hydrogen-containing gas by gas-liquid separation of the hydrogen-containing gas that is at least one of the high pressure state by the compression unit and the cooling state by the cooling unit. Therefore, according to the hydrogen purification system of the present invention, hydrogen is purified by omitting or reducing the dedicated hydrogen purification apparatus separately provided from the compression unit and the cooling unit required for supplying hydrogen. can do. As described above, the entire system can be reduced in size.

  In the hydrogen purification system according to the present invention, the gas-liquid separation unit is provided on the first flow path and in the cooling unit or on the downstream side of the cooling unit, and gas containing the hydrogen-containing gas in a high pressure state and a cooling state is removed. Liquid separation is preferable. By setting it as such a structure, the hydrogen-containing gas which passed through the compression part and the cooling part and was made into the high pressure state and the cooling state can be efficiently gas-liquid separated by the gas-liquid separation part. Therefore, according to the hydrogen purification system of the present invention, hydrogen is purified by omitting or reducing the dedicated hydrogen purification apparatus separately provided from the compression unit and the cooling unit required for supplying hydrogen. can do. As described above, the entire system can be reduced in size.

  In the hydrogen purification system according to the present invention, the gas-liquid separation unit is provided on the first flow path and upstream of the cooling unit, and may be configured to gas-liquid-separate the hydrogen-containing gas in a high-pressure state. Good. By setting it as such a structure, the hydrogen-containing gas which passed the compression part and was made into the high pressure state can be efficiently gas-liquid-separated by a gas-liquid separation part. Therefore, according to the hydrogen purification system of the present invention, hydrogen is purified by omitting or reducing the dedicated hydrogen purification apparatus separately provided from the compression unit and the cooling unit required for supplying hydrogen. can do. As described above, the entire system can be reduced in size.

  The hydrogen purification system according to the present invention further includes a second flow path that passes through the cooling unit and is connected to the compression unit on the upstream side of the compression unit, and allows the hydrogen-containing gas to flow. It is good also as a structure which is on a flow path and is provided in the inside of a cooling part, or the downstream rather than a cooling part, and gas-liquid separation of the hydrogen containing gas which is a cooling state. By setting it as such a structure, the hydrogen-containing gas which passed the cooling part and was made into the cooling state can be efficiently gas-liquid-separated by a gas-liquid separation part. Therefore, according to the hydrogen purification system of the present invention, hydrogen is purified by omitting or reducing the dedicated hydrogen purification apparatus separately provided from the compression unit and the cooling unit required for supplying hydrogen. can do. As described above, the entire system can be reduced in size.

  In the hydrogen purification system according to the present invention, it is preferable to further include an adsorption unit that adsorbs and removes impurities from the hydrogen-containing gas from the gas-liquid separation unit. The purity of the hydrogen-containing gas hydrogen can be increased by gas-liquid separation of the hydrogen-containing gas in a high-pressure state and / or a cooled state in the gas-liquid separation unit, but a trace amount of impurities remains. There is a case. Therefore, the hydrogen purity of the hydrogen-containing gas can be further increased by further providing an adsorption part that adsorbs and removes a small amount of impurities.

  A hydrogen supply system including a hydrogen generation system that generates a hydrogen-containing gas from a raw material and any of the hydrogen purification systems that purify hydrogen from the hydrogen-containing gas generated by the hydrogen generation system can be configured. According to the hydrogen supply system of the present invention, hydrogen can be purified by omitting or reducing the size of a dedicated device for purifying hydrogen separately from a compression unit and a cooling unit required for hydrogen supply. Can do. As described above, the entire system can be reduced in size.

  ADVANTAGE OF THE INVENTION According to this invention, the hydrogen purification system and hydrogen supply system which can achieve size reduction of the whole hydrogen supply system can be provided.

It is a block diagram which shows the structure of the hydrogen purification system and hydrogen supply system which concern on 1st embodiment of this invention. It is a block diagram which shows the structure of the hydrogen purification system and hydrogen supply system which concern on 1st embodiment of this invention. It is a block diagram which shows the structure of the hydrogen supply system which concerns on a comparative example. It is a block diagram which shows the structure of the hydrogen purification system and hydrogen supply system which concern on 2nd embodiment of this invention. It is a block diagram which shows the structure of the hydrogen purification system and hydrogen supply system which concern on 3rd embodiment of this invention.

  Hereinafter, embodiments of a hydrogen purification system and a hydrogen supply system according to the present invention will be described in detail with reference to the drawings.

[First embodiment]
First, a hydrogen purification system and a hydrogen supply system according to the first embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of a hydrogen purification system 120 and a hydrogen supply system 100 according to the first embodiment of the present invention. The hydrogen supply system 100 includes a hydrogen generation system 10 that generates a hydrogen-containing gas from a raw material, and a hydrogen purification system 120 that purifies hydrogen from the hydrogen-containing gas generated by the hydrogen generation system 10. The hydrogen generation system 10 according to the present embodiment will be described by taking as an example the case of using a hydrogen generation method by a dehydrogenation reaction using an organic compound (liquid at normal temperature) as a raw material. In the process of hydrogen purification, the dehydrogenated product (liquid at room temperature) (organic compound (liquid at room temperature)) obtained by dehydrogenating the organic compound (liquid at room temperature) as a raw material is removed. Examples of the raw material organic compound include organic hydride. An organic hydride is preferably a hydride obtained by reacting a large amount of hydrogen produced in a refinery with an aromatic hydrocarbon. In addition, the organic hydride is not limited to an aromatic hydrogenated compound, and there is a system of 2-propanol (hydrogen and acetone are generated). The organic hydride can be transported to the hydrogen supply system 100 as a liquid fuel by a tank lorry as in the case of gasoline. In this embodiment, methylcyclohexane (hereinafter referred to as MCH) is used as the organic hydride. In addition, hydrides of aromatic hydrocarbons such as cyclohexane, dimethylcyclohexane, ethylcyclohexane, decalin, methyldecalin, dimethyldecalin, and ethyldecalin can be used as organic hydrides. This is a preferred example). The present invention can also be applied to the production of hydrogen from liquid hydrocarbon raw materials such as natural gas mainly composed of methane, LPG mainly composed of propane, or gasoline, naphtha, kerosene, and light oil.

  In the present embodiment, a hydrogen station that supplies high-purity hydrogen to the FCV 30 will be described as an example of the hydrogen supply system 100. As shown in FIG. 1, the hydrogen supply system 100 includes a hydrogen generation system 10, a hydrogen purification system 120, and a dispenser 26. The hydrogen generation system 10 includes an MCH tank 11, a vaporizer 12, a dehydrogenation reactor 13, a gas-liquid separator 14, a toluene tank 15, a fuel tank 16, and a heat source 17. The hydrogen purification system 120 includes a compressor (compression unit) 21, a gas storage device 22, a cooler (cooling unit) 23, a gas-liquid separator (gas-liquid separation unit) 24, and an adsorbent (adsorption unit) 25. .

  First, the hydrogen generation system 10 will be described. The vaporizer 12 vaporizes the raw material MCH supplied from the MCH tank 11 and supplies it to the dehydrogenation reactor 13. The dehydrogenation reactor 13 takes out a hydrogen-containing gas from the MCH supplied from the vaporizer 12 by a dehydrogenation reaction using a dehydrogenation catalyst. Here, since the dehydrogenation reaction is an endothermic reaction, the heat source 17 supplies heat to the dehydrogenation reactor 13 through the high-temperature gas for heating. The hydrogen-containing gas taken out by the dehydrogenation reactor 13 is supplied to the gas-liquid separator 14 in a state containing toluene as a mixture as a mixture. The gas-liquid separator 14 gas-liquid-separates the supplied hydrogen-containing gas into a hydrogen-containing gas that is a gas and a toluene that is a liquid. Toluene, which is a liquid separated by the gas-liquid separator 14, is stored in the toluene tank 15. On the other hand, the hydrogen-containing gas which is a gas separated by the gas-liquid separator 14 is supplied to the compressor 21 in the hydrogen purification system 120. In addition, the purity of the hydrogen-containing gas when supplied to the hydrogen purification system 120 is 90 to 99.5%, the pressure is normal temperature to 1.0 MPa, and the temperature is 0 to 50 ° C.

  Next, the hydrogen purification system 120 will be described in detail with reference to FIGS. 1 and 2. FIG. 2 is a block diagram showing the configuration of the hydrogen purification system and the hydrogen supply system according to the first embodiment of the present invention. The hydrogen generation system 10 and the hydrogen purification system 120 in FIG. 2 are the same as the hydrogen generation system 10 and the hydrogen purification system 120 in FIG. 1, respectively. The hydrogen purification system 120 can obtain high-purity hydrogen of 99.97% or higher by purifying hydrogen from the hydrogen-containing gas generated by the hydrogen generation system 10, and more preferably high purity of 99.99% or higher. Purity hydrogen can be obtained.

  The flow of the hydrogen-containing gas in the hydrogen purification system 120 will be described. The hydrogen-containing gas supplied from the hydrogen generation system 10 to the compressor 21 in the hydrogen purification system 120 is connected to the gas storage device 22, the cooler 23, the gas-liquid separator 24, and the adsorbent 25 via the first flow path L1. , Dispenser 26 and FCV 30 in this order.

  The first flow path L1 is a flow path that is connected to the compressor 21 on the downstream side of the compressor 21 and flows through the cooler 23 to flow the hydrogen-containing gas. The first flow path L1 includes a line L11 from the compressor 21 to the gas storage device 22, a line L12 from the gas storage device 22 to the cooler 23, a line L13 passing through the inside of the cooler 23, and the cooler 23. And a line L14 up to FCV30. The line L13 passing through the inside of the cooler 23 is connected to the heat exchange line L15 in which the hydrogen-containing gas is cooled by heat exchange, and the heat exchange line L15 on the downstream side of the heat exchange line L15. And a downstream line L16 extending to the outside.

  The compressor 21 is a device that pumps the hydrogen-containing gas at a predetermined pressure. The compressor 21 brings the hydrogen-containing gas into a high pressure state at a pressure of 20 to 90 MPa. The compressor 21 supplies the hydrogen-containing gas to the gas storage device 22 via the line L11 after making the hydrogen-containing gas into a high-pressure state capable of supplying gas to the FCV 30 and efficiently performing gas-liquid separation. In addition, the compressor 21 in this embodiment employs a two-stage configuration including two compression units that perform compression. However, a single-stage configuration may be used as long as the target pressure can be obtained. Conversely, a multi-stage configuration of three or more stages may be used to obtain a target pressure.

  The gas storage device 22 is a device for storing the hydrogen-containing gas in a high pressure state. The hydrogen-containing gas stored in the gas storage device 22 flows to the cooler 23 via the line L12. Since the gas storage device 22 can store a certain amount of hydrogen-containing gas in a high-pressure state in the hydrogen purification system 120, hydrogen can be stably supplied to the FCV 30. Therefore, the hydrogen purification system 120 preferably includes the gas storage device 22. However, the gas storage device 22 may be omitted because it is not essential for performing hydrogen purification and hydrogen supply.

  The cooler 23 is a device that cools the hydrogen-containing gas. The cooler 23 cools the hydrogen-containing gas flowing through the heat exchange line L15 to −60 to 0 ° C. Thereby, the cooler 23 is in a cooling state in which the hydrogen-containing gas can be supplied to the FCV 30 and gas-liquid separation can be performed efficiently. The cooling temperature of the cooler 23 is higher than the cooling temperature in the cryogenic separation method, which is a separation method using conventional cooling, but even in such a temperature, High purity hydrogen can be obtained by adopting such a system configuration.

  The gas-liquid separator 24 gas-liquid separates the hydrogen-containing gas into a hydrogen-containing gas that is a gas and a toluene that is a liquid. The gas-liquid separator 24 can be disposed at any position on the line L13 that passes through the inside of the cooler 23. In this embodiment, the gas-liquid separator 24 is provided on the line L16 and immediately after the heat exchange line L15. As a result, the hydrogen-containing gas maintained at a high pressure in the gas accumulator 22 flows to the cooler 23 via the line L12 and is cooled by passing through the heat exchange line L15. 24. Accordingly, since the hydrogen-containing gas supplied to the gas-liquid separator 24 is in a high pressure state and a cooled state that enable efficient gas-liquid separation, the purity of hydrogen in the hydrogen-containing gas is reduced by gas-liquid separation. Can be increased. That is, when the hydrogen-containing gas containing hydrogen and impurities (toluene, methane, etc.) is in a high-pressure state, the impurities that are in the gaseous state under normal pressure are liquefied, thereby reducing the impurity concentration in the hydrogen-containing gas. Further, when the hydrogen-containing gas is in a cooled state, the impurities that are in a gaseous state at normal temperature are liquefied, thereby reducing the impurity concentration in the hydrogen-containing gas. High-purity hydrogen can be obtained by gas-liquid separation of the hydrogen-containing gas with impurities thus liquefied by the gas-liquid separator 24. The gas-liquid separator 24 may be provided at any position on the line L13 as long as the gas-liquid separation can be performed after the hydrogen-containing gas is sufficiently cooled. It may be provided. Further, although it may be provided in the middle of the heat exchange line L15, it is preferably provided on the downstream side of the heat exchange line L15, that is, on the line L16 in order to sufficiently cool the hydrogen-containing gas. In the present embodiment, the gas-liquid separator 24 is arranged on the line L16 inside the cooler 23. However, if the cooling state can be maintained, the line L14 outside the cooler 23 is used. You may arrange on top. In that case, it is preferable to provide a heat insulating material or the like around the line from the cooler 23 to the gas-liquid separator 24 and around the gas-liquid separator 24 so that the temperature of the hydrogen-containing gas in the gas-liquid separator 24 does not rise. .

  The adsorbent 25 is an adsorbent that removes impurities (toluene, methane, etc.) contained in the hydrogen-containing gas by adsorption. The hydrogen-containing gas that has been gas-liquid separated by the gas-liquid separator 24 is supplied to the adsorbent 25 via the line L16 and the line L14. Here, a trace amount of impurities may remain in the hydrogen-containing gas supplied to the adsorbent 25. Therefore, the adsorbent 25 adsorbs and removes a small amount of impurities, whereby the purity of hydrogen in the hydrogen-containing gas can be further increased. However, the adsorbent 25 may be omitted when a hydrogen-containing gas having a target purity is obtained without using the adsorbent 25.

  The hydrogen-containing gas obtained by adsorbing and removing impurities with the adsorbent 25 is supplied to the FCV 30 using the dispenser 26 via the line L14. In this embodiment, a fuel cell vehicle (FCV) is assumed as a hydrogen supply destination. However, the hydrogen supply destination needs to be supplied with hydrogen and has a mechanism for receiving supply of hydrogen. Anything is acceptable and not limited to FCV.

  Next, the operation and effect of the hydrogen purification system 120 according to the first embodiment will be described.

  First, the configuration of the hydrogen supply system 50 according to the comparative example will be described with reference to FIG. The hydrogen supply system 50 according to the comparative example includes a hydrogen generation system 10, a hydrogen purification compressor 41, a hydrogen purification gas-liquid separator 42, a hydrogen purification device 43, a compressor 21, a gas storage device 22, and a cooler 23. Is provided.

  Main differences between the hydrogen supply system 100 according to the first embodiment and the hydrogen supply system 50 according to the comparative example will be described.

  The hydrogen supply system 50 according to the comparative example includes a hydrogen purification compressor 41, a hydrogen purification gas / liquid separator 42, and a hydrogen purification device 43, while the gas / liquid included in the hydrogen purification system 120 according to the first embodiment. The separator 24 and the adsorbent 25 are not provided. The hydrogen purifier 43 differs depending on the hydrogen purification method employed. Specifically, the hydrogen purifier 43 is a hydrogen separation membrane when membrane separation is used as the hydrogen purification method, and adsorbs impurities when PSA or TSA is used. It is an adsorption removal apparatus provided with two or more adsorption towers which store the adsorbent to perform.

  As described above, the hydrogen supply system 50 according to the comparative example uses a conventional hydrogen purification method such as a hydrogen separation membrane, PSA, or TSA as a hydrogen purification method. A gas-liquid separator for purification 42 and a hydrogen purifier 43 are required. On the other hand, the hydrogen supply system 50 also requires a compressor 21, a gas storage device 22, and a cooler 23 in order to supply purified high-purity hydrogen to the FCV 30. As described above, in the hydrogen supply system 50 according to the comparative example, in addition to the compressor 21 and the cooler 23 required for supplying hydrogen, a dedicated device required only for hydrogen purification is additionally provided. . As a result, the entire system becomes larger by the dedicated device.

  On the other hand, as described above, the hydrogen purification system 120 according to the first embodiment is configured so that the hydrogen-containing gas is brought into a high-pressure state and a cooled state by the compressor 21 and the cooler 23 that are necessary for supplying hydrogen to the FCV 30. Thus, the gas-liquid separator 24 can efficiently perform gas-liquid separation. That is, the compressor 21 and the cooler 23 in the present embodiment can also function as a device for performing hydrogen purification in addition to a function as a device for supplying hydrogen to the FCV 30 (note that the hydrogen according to the comparative example) The compressor 21 and the cooler 23 in the supply system 50 function only as a device for supplying hydrogen to the FCV 30). Accordingly, the hydrogen purification compressor 41, the hydrogen purification gas-liquid separator 42, and the hydrogen purification device 43, which are provided separately from the compressor 21 and the cooler 23 required for hydrogen supply, are omitted, and the hydrogen Can be purified. As described above, the entire hydrogen supply system 100 can be reduced in size.

  Further, in the hydrogen supply system 100, by providing the adsorbent 25 together with the gas-liquid separator 24, it is easier to obtain high-purity hydrogen that can be supplied to the FCV 30 than when the gas-liquid separator 24 is used alone. Become.

  By configuring the hydrogen supply system 100 including the hydrogen generation system 10 and the hydrogen purification system 120 as described above, the compressor 21 and the cooler 23 required for supplying hydrogen are separately provided for hydrogen purification. The compressor 41, the gas-liquid separator 42 for hydrogen purification, and the hydrogen purifier 43 can be omitted to purify hydrogen. As described above, the entire hydrogen supply system can be reduced in size.

  As described above, the hydrogen supply system 100 includes the gas-liquid separator 24 and the adsorbent 25 that the hydrogen supply system 50 according to the comparative example does not have, but these are for hydrogen purification such as the hydrogen purifier 43. Since it is a small-scale device as compared with the dedicated device, the entire hydrogen supply system can be made smaller than the hydrogen supply system 50 according to the comparative example.

  An example of each condition when performing hydrogen purification using the hydrogen purification system 120 according to the first embodiment is given below.

[Example of the first embodiment]
The composition example of the hydrogen-containing gas after gas-liquid separation at 30 ° C. and 0.18 MPaG in the hydrogen generation system 10 is “hydrogen: toluene: MCH: methane = 98: 1.8: 0.2: 0. 05 "or so. First, this hydrogen-containing gas is compressed to 70 MPa by the compressor 21, and the concentration of toluene + MCH is reduced to about 120 ppm. Next, the hydrogen-containing gas is cooled to −40 ° C. by the cooler 23, and the concentration of toluene + MCH is reduced to about 1 ppm. Finally, the liquid toluene is separated by gas-liquid separation in the gas-liquid separator 24, and the remaining trace amount of toluene and methane are removed by the adsorbent 25, so that the concentration of toluene + MCH is 0.28 ppm or less. The high-purity hydrogen obtained in this way is supplied to the FCV 30 using the dispenser 26.

[Second Embodiment]
Next, a hydrogen purification system and a hydrogen supply system according to the second embodiment will be described with reference to FIG. FIG. 4 is a block diagram showing the configuration of the hydrogen purification system 220 and the hydrogen supply system 200 according to the second embodiment of the present invention. The hydrogen generation system 10 in FIG. 4 is the same as the hydrogen generation system 10 in FIGS. 1 to 3.

  The configuration and function of each component constituting the hydrogen purification system 220 according to the second embodiment is the same as that of the hydrogen purification system 120 according to the first embodiment shown in FIG. The first embodiment relates to the first embodiment in that the hydrogen-containing gas that is provided on the upstream side of the cooler 23 and is upstream of the cooler 23 and that is in a high-pressure state and not in the cooled state is compressed by the compressor 21. Mainly different from the hydrogen purification system 120. Hereinafter, a specific configuration of the difference will be described.

  Similar to the hydrogen purification system 120 according to the first embodiment, the hydrogen purification system 220 according to the second embodiment includes a compressor 21, a gas storage device 22, a cooler 23, a gas-liquid separator 24, and an adsorbent 25. Is provided. However, the gas-liquid separator 24 and the adsorbent 25 are disposed on the line L11 on the downstream side of the compressor 21 and on the upstream side of the gas storage unit 22. That is, in the hydrogen purification system 220 according to the second embodiment, the hydrogen-containing gas supplied from the hydrogen generation system 10 to the compressor 21 in the hydrogen purification system 220 is gas-liquid separated via the first flow path L1. The vessel 24, the adsorbent 25, the gas storage device 22, the cooler 23, the dispenser 26, and the FCV 30 are supplied in this order.

  The hydrogen purification system 220 according to the second embodiment can efficiently perform gas-liquid separation by the gas-liquid separator 24 after the hydrogen-containing gas is brought into a high pressure state by the compressor 21. Accordingly, the hydrogen purification compressor 41, the hydrogen purification gas-liquid separator 42, and the hydrogen purification device 43, which are provided separately from the compressor 21 and the cooler 23 required for hydrogen supply, are omitted, and the hydrogen Can be purified. As described above, the entire hydrogen supply system 200 can be reduced in size.

  When the compressor 21 has a multistage configuration including two or more compression units, the gas-liquid separator 24 is positioned on the most upstream side of the compressor 21 and the most downstream side of the compressor 21. You may arrange | position between compression units. Alternatively, the gas-liquid separator 24 may be disposed between the compression units, and further the gas-liquid separator 24 may be disposed on the downstream side of the compressor 21 itself. In these cases, the compression unit located on the most upstream side of the compressor 21 corresponds to the “compression unit” in the claims of the present invention. The flow path connecting the compression units is included in the “first flow path” in the claims of the present invention.

  An example of each condition when performing hydrogen purification using the hydrogen purification system 220 according to the second embodiment will be described below.

[Example of the second embodiment]
The composition example of the hydrogen-containing gas after gas-liquid separation at 30 ° C. and 0.18 MPaG in the hydrogen generation system 10 is “hydrogen: toluene: MCH: methane = 98: 1.8: 0.2: 0. 05 "or so. First, this hydrogen-containing gas is compressed to 70 MPa by the compressor 21, and the concentration of toluene + MCH is reduced to about 120 ppm. Next, toluene, which is liquid, is separated by gas-liquid separation in the gas-liquid separator 24, and the remaining trace amount of toluene and methane are removed by the adsorbent 25, so that the concentration of toluene + MCH is reduced to about 1 ppm. Finally, the hydrogen-containing gas is cooled to −40 ° C. with the cooler 23, and the concentration of toluene + MCH is set to 0.28 ppm or less. The high-purity hydrogen obtained in this way is supplied to the FCV 30 using the dispenser 26.

[Third embodiment]
Next, a hydrogen purification system and a hydrogen supply system according to a third embodiment will be described with reference to FIG. FIG. 5 is a block diagram showing the configuration of the hydrogen purification system 320 and the hydrogen supply system 300 according to the third embodiment of the present invention. The hydrogen generation system 10 in FIG. 5 is the same as the hydrogen generation system 10 in FIGS. 1 to 4.

  The configuration and function of each component constituting the hydrogen purification system 320 according to the third embodiment is the same as that of the hydrogen purification system 120 according to the first embodiment shown in FIG. A second flow path L2 connected to the compressor 21 on the upstream side of the machine 21, and a gas-liquid separator 24 is provided on the second flow path L2 and inside the cooler 23. This is mainly different from the hydrogen purification system 120 according to the first embodiment and the hydrogen purification system 220 according to the second embodiment in that the hydrogen-containing gas that is in a cooled state and not in a high pressure state is gas-liquid separated. Hereinafter, a specific configuration of the difference will be described.

  Similar to the hydrogen purification system 120 according to the first embodiment and the hydrogen purification system 220 according to the second embodiment, the hydrogen purification system 320 according to the third embodiment includes a compressor 21, a gas storage device 22, a cooler 23, A gas-liquid separator 24 and an adsorbent 25 are provided. However, it further includes a second flow path L2 that passes through the cooler 23 and is connected to the compressor 21 on the upstream side of the compressor 21 and allows the hydrogen-containing gas to flow.

  Here, the second flow path L2 includes a line L21 from the hydrogen generation system 10 to the cooler 23, a line L22 that passes through the inside of the cooler 23, and a line L23 from the cooler 23 to the compressor 21. The line L22 passing through the inside of the cooler 23 is connected to the heat exchange line L24 in which the hydrogen-containing gas is cooled by heat exchange, and the heat exchange line L24 on the downstream side of the heat exchange line L24. And a downstream line L25 extending to the outside.

  In the hydrogen purification system 320 according to the third embodiment, the gas-liquid separator 24 is disposed on the line L25, and the adsorbent 25 is disposed on the line L23. That is, in the hydrogen purification system 320 according to the third embodiment, the hydrogen-containing gas supplied from the hydrogen generation system 10 is supplied to the cooler 23, the gas-liquid separator 24, and the adsorbent 25 via the second flow path L2. The compressor 21 is supplied in this order, and from the compressor 21, the gas storage device 22, the cooler 23, the dispenser 26, and the FCV 30 are supplied in this order via the first flow path L1. As with the gas-liquid separator 24 according to the first embodiment, the gas-liquid separator 24 according to the third embodiment is also a position where gas-liquid separation can be performed after sufficiently cooling the hydrogen-containing gas. For example, it may be provided at any position on the line L22, and may be disposed on the line L23 outside the cooler 23 as long as the cooling state can be maintained.

  In the present embodiment, the hydrogen-containing gas from the gas storage device 22 is cooled again by the cooler 23 via the heat exchange line L15 on the first flow path L1, so that it can be supplied to the FCV 30. However, the cooler that passes the hydrogen-containing gas before gas-liquid separation by the gas-liquid separator 24 and the cooler that passes immediately before being supplied to the dispenser 26 may be separate devices. However, it is preferable that the same cooler 23 is shared as in the present embodiment from the viewpoint of downsizing of the system scale and equipment cost.

  The hydrogen purification system 320 according to the third embodiment can efficiently perform gas-liquid separation with the gas-liquid separator 24 after the hydrogen-containing gas is cooled by the cooler 23. Accordingly, the hydrogen purification compressor 41, the hydrogen purification gas-liquid separator 42, and the hydrogen purification device 43, which are provided separately from the compressor 21 and the cooler 23 required for hydrogen supply, are omitted, and the hydrogen Can be purified. As described above, the entire hydrogen supply system 300 can be reduced in size. In particular, since the hydrogen purification system 320 according to the third embodiment can obtain high-purity hydrogen on the upstream side of the compressor 21, the load on the compressor 21 (and equipment downstream thereof) can be reduced. it can.

  An example of each condition when performing hydrogen purification using the hydrogen purification system 320 according to the third embodiment will be given below.

[Example of the third embodiment]
The composition example of the hydrogen-containing gas after gas-liquid separation at 30 ° C. and 0.18 MPaG in the hydrogen generation system 10 is “hydrogen: toluene: MCH: methane = 98: 1.8: 0.2: 0. 05 "or so. First, this hydrogen-containing gas is cooled to −40 ° C. by the cooler 23, and the concentration of toluene + MCH is reduced to about 130 ppm. Next, toluene, which is liquid, is separated by gas-liquid separation by the gas-liquid separator 24, and the remaining trace amount of toluene and methane are removed by the adsorbent 25, so that the concentration of toluene + MCH is reduced to about 0.28 ppm. The high-purity hydrogen obtained in this way is supplied to the FCV 30 using the dispenser 26.

  The hydrogen purification system and the hydrogen supply system according to the present invention are not limited to the hydrogen purification system and the hydrogen supply system according to the third to third embodiments described above. For example, as described in detail in the description of each embodiment, the gas storage device 22 and the adsorbent 25 may be omitted, or the gas-liquid separator 24 may be disposed outside the cooler 23. In the above-described embodiment, the hydrogen generation system 10 generates a hydrogen-containing gas by a dehydrogenation reaction. However, the hydrogen generation system 10 is not limited to this method, and natural gas mainly containing methane or LPG mainly containing propane. Alternatively, any method for generating hydrogen may be employed, such as when hydrogen is produced from a liquid hydrocarbon feedstock such as gasoline, naphtha, kerosene, or light oil. In addition to hydrogen purification by the hydrogen purification systems 120, 220, and 320, by providing a conventional hydrogen purification unit 43, hydrogen purification can be performed by both the hydrogen purification unit 43 and the hydrogen purification systems 120, 220, and 320. It is good also as a structure to perform. Even in such a case, the apparatus scale of the hydrogen purifier 43 can be made smaller than before because the hydrogen purifying systems 120, 220, and 320 have a function of purifying hydrogen.

  The hydrogen supply system according to the above-described embodiment may be used for any application. For example, in the above-described embodiment, the hydrogen supply system is applied to a hydrogen station. In other words, it is used as a hydrogen station by connecting a hydrogen supply device (here, a dispenser) that supplies hydrogen to an external hydrogen consuming device (such as a fuel cell vehicle or a hydrogen vehicle) downstream from the hydrogen purification system. You can do it. In addition, hydrogen may be directly supplied to the hydrogen consuming device by connecting a hydrogen consuming device (such as a power generation device) downstream of the hydrogen purification system. For example, it may be used as a hydrogen supply system for a distributed power source (for example, a household power source or an emergency power source).

  DESCRIPTION OF SYMBOLS 10 ... Hydrogen production system, 11 ... MCH tank, 12 ... Vaporizer, 13 ... Dehydrogenation reactor, 14 ... Gas-liquid separator, 15 ... Toluene tank, 16 ... Fuel tank, 17 ... Heat source, 21 ... Compressor (compression) Part), 22 ... gas accumulator, 23 ... cooler (cooling part), 24 ... gas-liquid separator (gas-liquid separation part), 25 ... adsorbent (adsorption part), 26 ... dispenser, 30 ... FCV, 41 ... Compressor for hydrogen purification, 42 ... Gas-liquid separator for hydrogen purification, 43 ... Hydrogen purifier, 100, 200, 300 ... Hydrogen supply system, 120, 220, 320 ... Hydrogen purification system, L1 ... First flow path, L2 ... second flow path.

Claims (8)

A hydrogen purification system for purifying hydrogen from a hydrogen-containing gas produced by a hydrogen production system,
A compression section for bringing the hydrogen-containing gas into a high-pressure state;
A cooling unit for cooling the hydrogen-containing gas;
A first flow path connected to the compression section on the downstream side of the compression section and passing through the cooling section to flow the hydrogen-containing gas;
A gas-liquid separator that gas-liquid separates the hydrogen-containing gas that is at least one of the high-pressure state and the cooling state;
A hydrogen purification system comprising:   The gas-liquid separation unit is provided on the first flow path and in the cooling unit or downstream of the cooling unit, and gas-liquid separation of the hydrogen-containing gas in the high-pressure state and the cooling state is provided. The hydrogen purification system according to claim 1.   2. The hydrogen purification system according to claim 1, wherein the gas-liquid separation unit is provided on the first flow path and upstream of the cooling unit and gas-liquid-separates the hydrogen-containing gas in the high-pressure state. A second flow path that passes through the cooling unit and is connected to the compression unit on the upstream side of the compression unit, and allows the hydrogen-containing gas to flow;
The gas-liquid separation unit is provided on the second flow path and is provided in the cooling unit or downstream of the cooling unit, and gas-liquid separation of the hydrogen-containing gas in the cooled state is performed. The described hydrogen purification system.   The hydrogen purification system according to claim 1, further comprising an adsorption unit that adsorbs and removes impurities from the hydrogen-containing gas from the gas-liquid separation unit. A hydrogen supply system for supplying hydrogen,
A hydrogen generation system for generating a hydrogen-containing gas from a raw material;
The hydrogen purification system according to any one of claims 1 to 5, wherein hydrogen is purified from the hydrogen-containing gas generated by the hydrogen generation system;
A hydrogen supply system comprising:   The hydrogen purification system according to claim 1, wherein the hydrogen purification system is connected to a hydrogen supply device that supplies hydrogen to an external hydrogen consumption device. The hydrogen purification system according to any one of claims 1 to 5, which is connected to a hydrogen consuming apparatus.

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