JP6437191B2 - Hydrogen production system, hydrogen storage / transport system equipped with the same, and hydrogen production method - Google Patents

Description

  The present invention relates to a hydrogen production system that generates hydrogen used for hydrogenation of aromatic compounds by electrolysis of water, a hydrogen storage / transport system equipped with the same, and a hydrogen production method, and more particularly to hydrogen production in the state of organic hydride. The present invention relates to a hydrogen production system suitable for application to an organic chemical hydride method for storage and transportation, a hydrogen storage / transport system including the same, and a hydrogen production method.

  In recent years, an organic chemical hydride method has been developed in which an aromatic compound such as toluene is hydrogenated to store and transport hydrogen in the state of an organic hydride (hydrogenated aromatic compound). According to this technique, hydrogen is converted into organic hydride at the production site and transported in the form of organic hydride. Then, hydrogen and an aromatic compound are generated by a dehydrogenation reaction of organic hydride in a plant, a hydrogen station, or the like adjacent to a hydrogen use place such as a city. The aromatic compound produced by the dehydrogenation reaction is transported again to the hydrogen production site and used for the hydrogenation reaction.

  There are several existing technologies for producing hydrogen used for the hydrogenation of the aromatic compounds, and in particular, steam reforming methods using fossil fuels such as coal and natural gas as a raw material have become mainstream. Yes. However, the fossil fuel used in the steam reforming method is limited, and in the steam reforming reaction, carbon dioxide is generated together with hydrogen. Therefore, conventionally, a technique is known in which water is electrolyzed with electric power based on renewable energy (wind power, solar light, solar heat, hydropower, etc.), and hydrogen obtained thereby is used for hydrogenation of aromatic compounds. (See Patent Document 1 and Non-Patent Document 1).

JP 2013-136801 A

Satoshi Emori, 3 others, “Recyclable Renewable Energy System”, Hitachi Review, September 2012, Vol. 94, No. 9, p 648-649

  By the way, in the water electrolysis method as described above, high-purity water is required as the raw material water. However, in the prior art described in Patent Document 1 and Non-Patent Document 1, there is no special consideration for securing the raw material water. It wasn't done. However, when hydrogen is produced in an area where it is difficult to secure water, it is necessary to produce raw water by desalinating seawater.

  On the other hand, the production of raw water requires energy such as electricity and heat. However, in the above-described prior art, it is necessary to separately secure energy for the production of raw water. For example, when electric power derived from renewable energy is used in the production of raw water, the amount of electric power supplied is large, and the amount of electric power that can be used for hydrogen production (that is, the amount of hydrogen generated by water electrolysis) This causes a problem of lowering.

  The present invention has been devised in view of such problems of the prior art, and is consumed in the production of raw water for water electrolysis in a configuration in which hydrogen used for hydrogenation of aromatic compounds is generated by water electrolysis. The main object of the present invention is to provide a hydrogen production system, a hydrogen storage / transport system equipped with the hydrogen production system, and a hydrogen production method capable of acquiring the generated energy stably and at low cost.

  In the first aspect of the present invention, in a hydrogen production system, a power generation device (11) that generates electric power using renewable energy, and water electrolysis that generates hydrogen by electrolysis of raw water using the electric power An apparatus (12), a hydrogenation apparatus (14) for adding the hydrogen to an aromatic compound by a hydrogenation reaction to produce an organic hydride, and a fresh water generator (13) for producing the raw water based on an evaporation method The fresh water generator uses the heat of reaction in the hydrogenation device in the production of the raw water.

  In the hydrogen production system according to the first aspect, the raw water for water electrolysis is produced using the reaction heat of the hydrogenation reaction (exothermic reaction) in the hydrogenation apparatus. Energy can be acquired stably and at low cost. Thereby, stable hydrogen production is possible even in an environment where it is difficult to secure raw water.

  According to a second aspect of the present invention, with respect to the first aspect, the renewable energy is at least one of sunlight, wind power, and hydraulic power.

  In the hydrogen production system according to the second aspect, a new heat source is prepared even when hydrogen production is performed in an environment where renewable energy that cannot be directly used as a heat source such as solar power, wind power, and hydropower can be used. Therefore, stable hydrogen production is possible by using the reaction heat of the hydrogenation reaction in the hydrogenation apparatus.

  In a third aspect of the present invention, in a hydrogen storage / transport system, a hydrogen production system (2) relating to any one of the first and second aspects, and dehydrogenation of the organic hydride supplied from the hydrogen production system And a dehydrogenation system (3) for generating hydrogen by reaction.

In the fourth aspect of the present invention, in the hydrogen production method, a power generation step that generates electric power using renewable energy, a water electrolysis step that generates hydrogen by electrolysis of raw water using the electric power, A hydrogenation step of adding organic hydrogen to the aromatic compound by a hydrogenation reaction to produce an organic hydride, and a fresh water production step of producing the raw water based on an evaporation method, In the production of raw water, reaction heat in the hydrogenation step is used.

  As described above, according to the present invention, in a configuration in which hydrogen used for hydrogenation of an aromatic compound is generated by water electrolysis, it is possible to stably and inexpensively acquire energy consumed in the production of raw water for water electrolysis. It becomes possible.

1 is a block diagram showing a schematic configuration of a hydrogen storage / transport system according to a first embodiment. The block diagram which shows the modification of a structure of the hydrogen storage and transport system which concerns on 1st Embodiment. The block diagram which shows schematic structure of the hydrogen storage and transport system which concerns on 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a schematic configuration of a hydrogen storage / transport system 1 according to the first embodiment of the present invention, and FIG. 2 is a block diagram showing a modification of the configuration of the hydrogen storage / transport system. The hydrogen storage / transport system 1 includes a hydrogen production system 2 that generates an organic hydride (here, methylcyclohexane) for storage / transport by adding hydrogen to an aromatic compound (here, toluene), and its organic It is mainly comprised from the dehydrogenation system 3 which produces | generates hydrogen and an aromatic compound by dehydrogenation of hydride.

  The hydrogen production system 2 includes a power generation device 11 that generates power using renewable energy, a water electrolysis device 12 that generates hydrogen by electrolysis of raw material water using power from the power generation device 11, and water electrolysis. A fresh water generator 13 for producing raw water used in the apparatus 12 based on an evaporation method, a hydrogenator 14 for adding hydrogen to toluene (TOL) by a hydrogenation reaction to produce an organic hydride, and a hydrogenator 14 And a first MCH storage device 15 for storing methylcyclohexane (hereinafter referred to as “MCH”) produced by the above.

  The power generation apparatus 11 includes a known solar power generation apparatus that converts sunlight into electric power, a known wind power generation apparatus that converts wind energy into electric power, a hydroelectric power generation apparatus that converts water fall energy into electric power, and the like. The power generation device 11 can be operated at all times and generates power to be supplied to the water electrolysis device 12 (power generation process). In FIG. 1, sunlight, wind power, and hydraulic power are shown as renewable energies, but in the hydrogen production system 2, these can be used alone or in combination. Moreover, the structure containing renewable energy other than sunlight, wind power, and hydropower (for example, geothermal) may be included as renewable energy. Furthermore, the power generation device 11 has a known power storage function for leveling the power supply to the water electrolysis device 12, and a known transformation function for performing voltage conversion and adjustment, conversion between AC and DC, and the like. It may be a thing.

  In the present embodiment, all the electric power generated by the power generation device 11 is supplied to the water electrolysis device 12, and the renewable energy is converted into hydrogen. However, the present invention is not limited to this, and a part of the generated electric power may be used by another device in the hydrogen storage / transport system 1 as necessary. Further, when the power transmission loss or the like is small, a part of the generated electric power can be used for other purposes (for example, residential use) outside the hydrogen storage / transport system 1.

  The water electrolysis device 12 receives supply of electric power (DC power) from the power generation device 11 and supply of raw water (high-purity water) from the water generator 13, thereby providing raw water based on the alkaline water electrolysis method. Is electrolyzed (water electrolysis process). In the water electrolysis apparatus 12, for example, potassium hydroxide is used as an electrolyte, and when a voltage is applied between the electrodes, oxygen and hydrogen are generated from the anode and the cathode, respectively. About the material of the electrode of the water electrolysis apparatus 12, it can select suitably from a well-known material in consideration of the degradation by the fluctuation | variation of the electric power supplied, etc. In addition, the water electrolysis apparatus 12 is not limited to the alkaline water electrolysis method, and may employ other known methods (a method using a solid polymer electrolyte, a method using a solid oxide electrolyte, or the like). However, the water electrolysis method is more preferably one that can realize high efficiency by reducing heat supply from the outside even when the electrolysis temperature is relatively low. In addition, in order to raise the efficiency of the water electrolysis apparatus 12, when it is necessary to raise electrolysis temperature, a part of reaction heat of the hydrogenation apparatus 14 mentioned later can be utilized.

  In addition, when sunlight is used as renewable energy, a water splitting technique using a photocatalyst can also be applied. In this case, as shown in FIG. 2, a known photocatalytic water splitting device 25 can be used instead of the power generation device 11 and the water electrolysis device 12 shown in FIG. The photocatalytic water splitting device 25 decomposes the raw water from the fresh water generator 13 into hydrogen and oxygen by a photocatalyst excited by the absorption of sunlight. The hydrogen storage / transport system 1 according to the modification of FIG. 2 has the same configuration as the hydrogen storage / transport system 1 of FIG.

  In the present embodiment, high-purity hydrogen generated in the water electrolysis apparatus 12 is sent to the hydrogenation apparatus 14, and in order to level the amount of hydrogen supplied to the hydrogenation apparatus 14, hydrogen is converted into high-pressure gas or liquid. Hydrogen may be temporarily stored in a storage tank (not shown) or the like. Further, it is possible to use a part of the generated hydrogen at a hydrogen demand destination outside the hydrogen storage / transport system 1.

  The fresh water generator 13 has a known configuration based on the multistage flash method, and includes a plurality of decompression chambers, brine heaters, and the like. The fresh water generator 13 generates high-purity water by desalinating seawater by receiving heat supplied from the hydrogenation device 14 described later (fresh water production step). Steam heated in the hydrogenation device 14 is introduced into the brine heater of the fresh water generator 13 through the heat medium circulation line L1 as a heat medium for heating seawater. This steam is circulated to the hydrogenation device 14 again through the heat medium circulation line L1 after heat exchange with seawater. The water production ratio (production water amount kg / steam amount kg) in the fresh water generator 13 is about 8 to 10. In addition, the fresh water generator 13 is not limited to the multistage flash method, as long as at least seawater or the like (water having a high salinity or pollution level) can be evaporated to obtain high-purity water (for example, other evaporation methods (for example, A configuration based on the multiple utility method) may be adopted. Similarly, when other evaporation methods are used, it is preferable to use a configuration in which heat is supplied from the hydrogenation device 14.

  The high-purity water produced in the fresh water generator 13 is supplied to the water electrolyzer 12 where it is used as raw water for water electrolysis. In the water produced by the fresh water generator 13, impurities may be left to the extent that the water electrolysis in the water electrolyzer 12 is not significantly hindered. Further, in the hydrogen production system 2, since the reaction heat generated in the hydrogenation device 14 is used for fresh water generation, water exceeding the necessary amount of raw water used in the water electrolysis device 12 can be produced in the fresh water generation device 13. is there. When the water produced in the fresh water generator 13 is surplus, the surplus water can be used as, for example, washing water for solar panels or living water in the surrounding area.

  In the hydrogenation device 14, hydrogen supplied from the water electrolysis device 12 is added to toluene by a hydrogenation reaction in the presence of a catalyst to generate MCH (hydrogenation step). The product of the hydrogenator 14 (MCH is the main product, including unreacted residual hydrogen and by-products, etc.) is below the boiling point of MCH in a gas-liquid separator (not shown) having a known configuration. Gas-liquid separation is performed in a maintained state, and the separated MCH (liquid) is sent to the first MCH storage device 15. The first MCH storage device 15 has a storage tank that can store the MCH from the hydrogenation device 14 at room temperature. It should be noted that at least a part of the residue separated as gas in the gas-liquid separator (such as unreacted residual hydrogen) can be circulated to the hydrogenator 14.

In the hydrogenation apparatus 14, hydrogen is chemically added to toluene (C ₇ H ₈ ) by a hydrogenation reaction based on the following chemical reaction formula (1). This hydrogenation reaction is an exothermic reaction (ΔH ₂₉₈ = −205 kJ / mol). Thus, toluene is converted to _MCH (C _{7 H 14).}

  Here, the reaction temperature of the hydrogenation reaction is in the range of 150 ° C to 250 ° C, more preferably in the range of 160 ° C to 220 ° C. The reaction pressure of the hydrogenation reaction is in the range of 0.1 MPaG to 5 MPaG, more preferably in the range of 0.5 MPaG to 3 MPaG. The supply amount ratio of toluene and hydrogen to the hydrogenation device 14 (toluene / hydrogen (molar ratio)) is 1/3 in the stoichiometric ratio, but is preferably set to 1/2 to 1/10. Preferably it is 1 / 2.5-1 / 5. In particular, it is preferable to set to 1/3 to 1/4. Here, by optimizing the lower limit of the supply amount ratio of toluene and hydrogen to the hydrogenation device 14, toluene can be sufficiently reacted, while by optimizing the upper limit of the supply amount ratio, It can suppress that the quantity of the residue isolate | separated as gas in a gas-liquid separator is excessive.

  Although not shown in detail, the hydrogenation apparatus 14 is a known heat exchange type fixed-bed multitubular reactor, and a plurality of reaction tubes filled with a hydrogenation catalyst (solid catalyst) are accommodated in a shell. It has a configuration. Since the hydrogenation reaction is an exothermic reaction, it is necessary to appropriately remove the heat of reaction in order to avoid a decrease in the equilibrium conversion rate due to an increase in the reaction temperature. The shell of the fixed-bed multitubular reactor is provided with a cooling jacket, and a heat medium (here, steam) flows through the cooling jacket. The heat medium heated by the reaction heat of the hydrogenation reaction is sent to the fresh water generator 13 through the heat medium circulation line L1, cooled there, and then fixed through the heat medium circulation line L1. It is circulated in. By such a cooling mechanism of the hydrogenation device 14, the reaction temperature of the hydrogenation reaction is appropriately adjusted, and heat is supplied to the fresh water generator 13. In addition, when the amount of reaction heat of the hydrogenation reaction is excessive, a part of the reaction heat may be used for applications other than the fresh water generator 13.

  The aromatic compound used for hydrogenation in the hydrogenation apparatus 14 is not particularly limited to toluene, and examples thereof include monocyclic aromatic compounds such as benzene and xylene, and 2 such as naphthalene, tetralin, and methylnaphthalene. Cyclic aromatic compounds and tricyclic aromatic compounds such as anthracene can be used alone or as a mixture of two or more.

  Moreover, the organic hydride which is the main product of the hydrogenation apparatus 14 is obtained by hydrogenating the above aromatic compound. Not only methylcyclohexane but also a monocyclic organic hydride such as cyclohexane, tetralin, decalin, methyldecalin. Or a bicyclic organic hydride such as tetradecahydroanthracene, or a mixture of two or more thereof. As the organic hydride, a material that can be handled as a stable liquid at normal temperature and normal pressure may be selected in consideration of convenience of storage and transportation.

  In addition, the hydrogenation catalyst is formed on a support selected from alumina, silica alumina, and silica on nickel (Ni), platinum (Pt), palladium (Pd), rhodium (Rh), iridium (Ir), and ruthenium (Ru). However, the present invention is not limited to this, and any known catalyst used for hydrogenating aromatic compounds can be used.

  On the other hand, the dehydrogenation system 3 includes a second MCH storage device 21 that stores MCH generated by the hydrogen production system 2, a dehydrogenation reaction device 22 that generates hydrogen by a dehydrogenation reaction of MCH, and a dehydrogenation reaction device 22. And a toluene (TOL) storage device 23 for storing toluene produced together with hydrogen. The MCH stored in the first MCH storage device 15 in the hydrogen production system 2 is transported to the second MCH storage device 21 having a storage tank via the MCH transport line L2 (storage / transport process). Here, the MCH transport line L2 is composed of a pipe (pipeline or the like) connecting the first MCH storage device 15 and the second MCH storage device 21, but the MCH transport line L2 is always provided like a pipe. Need not be. For example, a known transport means (for example, a vehicle such as a tank car or a ship such as a tanker) that can transport MCH between the first MCH storage device 15 and the second MCH storage device 21 may be applied to the MCH transport line L2. it can. The MCH stored in the second MCH storage device 21 is supplied to the dehydrogenation reaction device 22.

  In the dehydrogenation reactor 22, hydrogen and toluene are mainly generated from MCH by a dehydrogenation reaction in the presence of a catalyst (dehydrogenation reaction step). The dehydrogenation reactor 22 includes a heat exchange type fixed-bed multitubular reactor, and has a known configuration in which a plurality of reaction tubes filled with a dehydrogenation catalyst (solid catalyst) are accommodated in a shell. Yes. MCH supplied to each reaction tube of the dehydrogenation reactor 22 flows while contacting the catalyst. A heat supply medium (high-temperature steam or hot oil) is supplied to the shell from a heat transport line (not shown), whereby heat exchange is performed with the reaction tube, and the MCH and the dehydrogenation catalyst are heated. The dehydrogenation reaction in the dehydrogenation reactor 22 is based on the reverse reaction of the above chemical reaction formula (1).

  The dehydrogenation catalyst is made of nickel (Ni), platinum (Pt), palladium (Pd), rhodium (Rh), iridium (Ir), and ruthenium (Ru) on a support selected from alumina, silica alumina, and silica. The catalyst is supported on at least one selected active metal, but is not limited to this, and a known catalyst used for organic hydride dehydrogenation can be used.

  In particular, a homogeneous highly dispersed metal catalyst is effective as the dehydrogenation catalyst. In the uniform type highly dispersed metal catalyst, by pre-dispersing sulfur or a sulfur compound substantially uniformly over the entire cross section of the catalyst carrier, the catalyst metal is supported substantially in accordance with the distribution of the sulfur or sulfur compound, As a result, the catalyst metal is supported in a substantially uniformly dispersed state over the entire support cross section.

  In particular, when the catalyst support is alumina, the slurry of aluminum hydroxide produced by neutralization of the aluminum salt is filtered and washed, and the resulting alumina hydrogel is dehydrated and washed, and then at 400 to 800 ° C. for 1 to 6 hours. A porous γ-alumina support obtained by baking to a certain extent is preferable, and further, the pH value of the alumina hydrogel is alternately changed between the alumina hydrogel dissolution pH region and the boehmite gel precipitation pH region, and at least one of them is used. A porous γ-alumina support obtained through a pH swing process in which an alumina hydrogel-forming substance is added to grow crystals of alumina hydrogel upon pH change from one pH region to the other is more preferable. Such a porous γ-alumina carrier is excellent in that the physical properties of individual pellets are stable and there is little variation in physical properties even in the molded alumina pellets with excellent uniformity of pore distribution. ing. As a result, for the dehydrogenation reaction of the present case, the catalyst is excellent in catalytic activity and selectivity, and in addition, the catalyst can exhibit more excellent functions in a long life.

  Hydrogen produced in the dehydrogenation reactor 22 is sent to a place where hydrogen is used such as in a city. Alternatively, by using the hydrogen generated in the dehydrogenation reactor 22 as a fuel for a thermal power plant (hydrogen-mixed power plant), power is generated again, so that the power derived from renewable energy having a large temporal fluctuation can be substantially reduced. There is an advantage that smooth leveling can be achieved.

  On the other hand, the toluene produced in the dehydrogenation reactor 22 is stored in a toluene storage device 23 having a storage tank. The toluene storage device 23 is supplied again to the hydrogenation device 14 via the toluene circulation line L3 and used as a reaction product of the hydrogenation reaction. The toluene circulation line L3 can be configured in the same manner as the above-described MCH transport line L2.

  In the hydrogen storage / transport system 1, the storage of organic hydride and the method of generating hydrogen from the organic hydride can be performed based on the organic chemical hydride method.

  For details on the organic chemical hydride method, see, for example, Yoshitsugu Okada et al., Development of dehydrogenation catalyst for organic chemical hydride method, Catalyst, 2004, 46 (6), p510-512, ISSN. 05598958, Yoshida Okada et al., Development of organic chemical hydride dehydrogenation catalyst and hydrogen energy chain vision, Catalyst, 2009, 51 (6), p496-498 , ISSN 05598958., Yoshida Okada et al., Development of organic chemical hydride dehydrogenation catalyst aiming at establishment of large-scale long-distance storage and transport technology of hydrogen energy, Chemical Engineering, 2010, 74 (9), p468-470, ISSN 03759253. Yoshida Okada et al., Development of organic chemical hydride dehydrogenation catalyst for hydrogen storage and transport (New Year Special GSC Symposium 2005), Fine Chemicals, 2006, 35 (1), p5-13, I The description of the specification is omitted with reference to SSN 09136150.

  Thus, in the hydrogen production system 2 according to the first embodiment, raw water for water electrolysis in the water electrolysis device 12 is produced by the evaporation method using the reaction heat of the hydrogenation reaction (exothermic reaction) in the hydrogenation device 14. Since it is set as the structure which carries out, it can acquire the energy used for water preparation stably and at low cost. This makes it possible to stably produce hydrogen even in an environment where it is difficult to secure raw water (for example, an area that is not blessed with rainwater, river / lake water, groundwater, etc.). Moreover, according to the hydrogen production system 2, electric power derived from renewable energy is consumed in large quantities for the production of raw water for water electrolysis, and can be obtained by water electrolysis (that is, obtained by water electrolysis). There is no inconvenience such as reduction of hydrogen generation amount.

  In addition, the hydrogen production system 2 is particularly suitable when using renewable energy that is not used as a direct heat source such as sunlight, wind power, and hydropower. That is, in the hydrogen production system 2, even when hydrogen production is performed in an environment where renewable energy that is not directly used as a heat source can be used, it is not necessary to prepare a new heat source, and the hydrogenation reaction in the hydrogenation device 14 can be performed. There is an advantage that stable hydrogen production becomes possible by using reaction heat.

(Second Embodiment)
FIG. 3 is a block diagram showing a schematic configuration of the hydrogen storage / transport system 1 according to the second embodiment of the present invention. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals. In addition, the second embodiment is the same as the first embodiment, except for matters specifically mentioned below.

In the hydrogen storage / transport system 1 according to the second embodiment, the power generation device 11 and the water electrolysis device 12 in the first embodiment are omitted, and a reformer 31 that newly performs steam reforming of hydrocarbon, and a reformer A carbon dioxide (CO ₂ ) recovery device 32 that absorbs carbon dioxide contained in the reformed gas from 31 in the absorption liquid is provided.

In the reformer 31, the reforming step is performed by reacting methane with water vapor in the presence of a catalyst (for example, a nickel-based catalyst) in a high temperature (for example, 500 ° C. to 900 ° C.). Steam reforming is mainly based on the following chemical reaction formulas (2) and (3).

Further, in order to increase the hydrogen concentration in the reformed gas, hydrogen and carbon dioxide are generated from carbon monoxide and water vapor in the presence of the catalyst by a shift reaction. The temperature of the shift reaction can be appropriately set in consideration of the reaction rate of the shift reaction and the composition ratio of the product. Here, the concentration of carbon monoxide is lowered in two stages: a shift reaction at a relatively high temperature (about 350 to 420 ° C.) and a shift reaction at a relatively low temperature (about 200 to 300 ° C.). The shift reaction is mainly based on the following chemical reaction formula (4).

  As the steam reforming process as described above, well-known techniques such as ICI (Imperial Chemical Industries, Ltd.) method and Topso (Haldor Topsoe) method can be used. In the shift reaction, partial oxidation reforming may be used as a method for converting methane into a gas mainly composed of hydrogen and carbon monoxide.

  The water used for the reaction in the reformer 31 is supplied from the fresh water generator 13 that uses the reaction heat of the hydrogenator 14. The reformed gas generated by the reformer 31 is cooled by a cooling device, and then condensed water is separated by a gas-liquid separator (both not shown). The gas after the condensed water is separated is supplied to the carbon dioxide gas recovery device 32.

  The carbon dioxide recovery device 32 is a device that uses carbon dioxide separation and recovery technology based on the chemical absorption method. The carbon dioxide recovery device 32 uses a chemical absorption method in which an alkanolamine aqueous solution that selectively dissolves carbon dioxide is used as an absorbent (absorbent). As the alkanolamine as the absorbing liquid, monoethanolamine is used in the present embodiment, but is not limited thereto, diethanolamine, triethanolamine, methyldiethanolamine, diisopropanolamine, diglycolamine, 2-amino-2-methyl- 1-propanol or the like can be used. The reformed gas (having hydrogen as a main component) after the carbon dioxide gas is removed by the carbon dioxide recovery device 32 is supplied to the hydrogenation device 14 where it is used for the hydrogenation reaction.

  As described above, in the hydrogen production system 2 according to the second embodiment, the water used for the reaction in the reformer 31 is evaporated by using the reaction heat of the hydrogenation reaction (exothermic reaction) in the hydrogenator 14. Since it is set as the structure manufactured, there exists an advantage that the energy used for fresh water can be acquired stably and at low cost, and it is not necessary to prepare the energy source for fresh water separately.

  Note that the reforming device 31 and the carbon dioxide gas recovery device 32 in the second embodiment can be added to the configuration of the first embodiment. In that case, the water generator 13 supplies water to the water electrolyzer 12 and the reformer 31, and the hydrogenator 14 is supplied with hydrogen from the water electrolyzer 12 and the carbon dioxide recovery device 32. Is done.

  As mentioned above, although this invention was demonstrated based on specific embodiment, these embodiment is an illustration to the last, Comprising: This invention is not limited by these embodiment. Note that the components of the hydrogen production system according to the present invention, the hydrogen storage / transport system including the hydrogen production method, and the hydrogen production method shown in the above-described embodiments are not necessarily all essential, and at least depart from the scope of the present invention. As long as it is not, selection can be made as appropriate. In addition, a composite apparatus having the functions of a plurality of apparatuses shown in the above embodiments can be used.

DESCRIPTION OF SYMBOLS 1 Hydrogen storage and transport system 2 Hydrogen production system 3 Dehydrogenation system 11 Power generation apparatus 12 Water electrolysis apparatus 13 Fresh water generation apparatus 14 Hydrogenation apparatus 15 1st MCH storage apparatus 21 2nd MCH storage apparatus 22 Dehydrogenation reaction apparatus 23 Toluene storage apparatus 31 Quality device 32 Carbon dioxide gas recovery device

Claims (4)

A power generation device that generates power using renewable energy;
A water electrolysis device that generates hydrogen by electrolysis of raw water using the electric power;
A hydrogenation device for adding organic hydrogen to an aromatic compound by a hydrogenation reaction to produce an organic hydride;
A fresh water generator for producing the raw water based on the evaporation method,
The water electrolysis apparatus, and utilizing the reaction heat in the hydrogenation apparatus in electrolysis of the raw water, Rutotomoni raised electrolysis temperature, in order to equalize the supply amount of hydrogen in the hydrogenation apparatus, resulting the hydrogen Has a tank that temporarily stores it as high-pressure gas or liquid hydrogen ,
The fresh water generator produces water that exceeds the required amount of the raw water used in the water electrolysis device by utilizing the reaction heat in the hydrogenator in the raw water production ,
The power generator, hydrogen production system, wherein said order to level the power supplied to the water electrolysis apparatus, which have a function of storing electric power generated by combining the renewable energies different. The renewable energy hydrogen production system according to claim 1, characterized in that it comprises solar, wind, and at least one of hydropower. The hydrogen production system according to claim 1 or 2 ,
A hydrogen storage / transport system comprising: a dehydrogenation system that generates hydrogen by a dehydrogenation reaction of the organic hydride supplied from the hydrogen production system. A power generation process that uses renewable energy to generate electricity;
A water electrolysis process for generating hydrogen by electrolysis of raw water using the electric power;
A hydrogenation step of adding the hydrogen to an aromatic compound by a hydrogenation reaction to produce an organic hydride;
A fresh water producing step of producing the raw water based on the evaporation method,
The water electrolysis process utilizes reaction heat in the hydrogenation step in the electrolysis of the raw water, Rutotomoni raised electrolysis temperature, in order to equalize the supply amount of hydrogen in the hydrogenation step, resulting the hydrogen A step of temporarily storing in a storage tank as high-pressure gas or liquid hydrogen ,
The water production step produces water that exceeds the required amount of the raw water used in the water electrolysis step by utilizing reaction heat in the hydrogenation step in the production of the raw water .
In the power generation step, the hydrogen production method is characterized by accumulating power generated by combining a plurality of different renewable energies in order to level the power supplied to the water electrolysis apparatus .

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