JP2009107884A - Fuel gas generating device and fuel cell system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-size hydrogen generating device and a fuel cell system, for suppressing a residual product from moving by easily breaking bubbles from the residual product and removing an unreacted product. <P>SOLUTION: The hydrogen generating device generates hydrogen by the reaction of a solid reactant 1 and an aqueous solution 2 for the reaction, wherein the device includes a heat supply unit 40 supplying heat to a residual product produced by the reaction of the solid reactant 1 and the aqueous solution 2 for the reaction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to, for example, a fuel gas generation device that decomposes a compound to generate fuel gas, and a fuel cell system that uses fuel gas generated by the fuel gas generation device as fuel.

  Due to the recent increase in energy problems, there is a demand for a power source with higher energy density and clean emissions. A fuel cell is a generator having an energy density several times that of an existing cell, has high energy efficiency, and is characterized by no or little nitrogen oxides and sulfur oxides contained in exhaust gas. Therefore, it can be said that it is a very effective device that meets the demand as a next-generation power supply device.

In a fuel cell that obtains an electromotive force by an electrochemical reaction between hydrogen and oxygen, hydrogen is required as a fuel. Examples of a hydrogen generator that generates hydrogen used in a fuel cell include an apparatus that generates hydrogen by reacting a metal hydride (borohydride salt) with water. In a hydrogen generator using such a liquid, a residual product is generated together with hydrogen, and thus a mixture containing hydrogen and the residual product may flow out from the reaction vessel. For this reason, in order to isolate | separate hydrogen from a residual product, there exist some which provided the separator between reaction container and a fuel cell.
JP 2002-154803 A

  In such a conventional hydrogen generator, it may be necessary to lengthen the separator in order to drop impurities. As a result, the volume of the hydrogen generator increases. The cause is related to the generation and increase of bubbles during the reaction as shown below.

  When hydrogen (fuel gas) generation reaction occurs from water, bubbles are generated. The bubble foam film is composed of a residual product including excessively supplied water and the like, but the residual product is highly hydrated and highly viscous, and thus forms a strong foam film. That is, the bubbles are difficult to break, and once the bubbles are formed, the shape is maintained for a long time.

  Moreover, since the total amount of the metal hydride dissolved in water does not react quickly, the residual product contains unreacted metal hydride. This unreacted metal hydride gradually reacts with moisture in the foam film, and further generates bubbles.

  As described above, bubbles continue to be formed and increase, and the bubbles are not easily broken, so that the residual product increases in volume and easily flows out from the reaction vessel to the separator.

  When water flows out together with the residual product into the separator, water and unreacted metal hydride react to generate more hydrogen. At the same time, bubbles are also generated to further increase the volume of the residual product. In order to prevent this residual product from flowing out of the separator, the volume of the separator must be increased to increase the portion where the residual product can be stored.

  Even when water does not flow into the separator, the residual product moves along the wall of the container and fills the container as it increases, thus preventing the residual product from moving to the power generation unit. In order to prevent this, the separator and reaction vessel must be enlarged.

  The present invention has been made in view of such circumstances, and reduces the volume of the residual product by facilitating breakage of bubbles of the residual product, thereby reducing the size of the residual fuel gas generating device and the fuel cell system. The purpose is to provide.

  A first aspect of the present invention that solves the above problem is a fuel gas generation device that generates a fuel gas by a reaction between a reaction aqueous solution and a reactant, wherein the reaction aqueous solution and the reactant react. The fuel gas generation apparatus includes a heat supply unit that supplies heat to the residual product generated by the above.

  As a result, the residual product is heated and the temperature rises, so that the viscosity of the foam film is lowered and the foam is easily broken. Further, the hydrogen generation reaction between the unreacted reactant contained in the foam film and water is promoted, and the unreacted reactant can be reduced. As a result, the volume of the residual product can be reduced to suppress the movement, and the apparatus can be miniaturized.

  In the second aspect of the present invention, the heat supply unit is a heat transfer unit that transfers heat generated by the reaction between the reaction aqueous solution and the reactant to the residual product, and the reaction proceeds in the vicinity of the heat transfer unit. In the fuel gas generation device according to the first aspect of the invention.

  As a result, it becomes possible to use the reaction heat generated in the reaction that generates the fuel gas for the heat supplied to the residual product, and it is not necessary to separately provide a power source for supplying the heat. The apparatus can be miniaturized.

  In the third aspect of the present invention, the reactant is a solid reactant, the solid reactant is fixed to the heat transfer section, and the reaction between the aqueous solution for reaction and the solid reactant is the contact surface between the solid reactant and the heat transfer section. In the fuel gas generation device according to the second aspect,

  As a result, the hydrogen generation reaction can be stably generated in the heat transfer section, so that the reaction heat can be efficiently transferred to the heat transfer section and used to reduce the volume of the residual product. Become.

  According to a fourth aspect of the present invention, there is provided the fuel gas generating apparatus according to the first aspect, wherein the heat supply unit is constituted by a water-containing member having water retention.

  As a result, when moisture is released from the residual product by heat supply, water can be present in the heat supply unit, so that the foam film of the residual product is more easily broken, and more unreacted reactants react. It becomes possible to make it an easy environment.

  A fifth aspect of the present invention has an anode chamber to which fuel gas is supplied, and also has the fuel gas generation device according to any one of the first to fourth aspects as fuel gas supply means to the anode chamber. In the fuel cell system.

Thereby, since a residual product does not flow out from the fuel gas generator, a fuel cell system capable of stably supplying electric power can be realized.
In the aspect of the present invention, hydrogen is used as the fuel gas for generating electric power, but it goes without saying that other fuel gas may be used.

  In the present invention, since heat is supplied from the heat supply unit to the residual product generated by the reaction between the aqueous solution for reaction and the reactant, the bubbles generated during the reaction are easily broken and increase in bubbles. Can be suppressed. Therefore, the volume of the residual product can be reduced, and the apparatus can be miniaturized.

  Hereinafter, the present invention will be described in detail based on embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing a schematic configuration of a hydrogen generator according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the hydrogen generation apparatus includes a reaction vessel 10 that generates a hydrogen generation reaction, and a solution vessel 20 that is connected to the reaction vessel 10 through a solution flow path 30. The reaction vessel 10 includes a holding unit 11 that holds the solid reactant 1 that is a reaction product of the hydrogen generation reaction, a heat supply unit 40, and a hydrogen discharge unit 12 that discharges hydrogen from the reaction vessel 10. . The solution container 20 stores a reaction aqueous solution 2 that is the other reactant of the hydrogen generation reaction. The solution flow path 30 is arranged so as to supply the reaction aqueous solution 2 from the solution container 20 to the solid reactant 1, and the reaction aqueous solution 2 is moved by the supply control device 31 provided in the solution flow path 30. Made. The heat supply unit 40 operates with electric power supplied from the power source 42 while being ON / OFF controlled by the control unit 41.

The solid reactant 1 is a substance that reacts with water to generate hydrogen. Examples include metal hydrides such as sodium borohydride, potassium borohydride, and lithium aluminum hydroxide. The reaction aqueous solution 2 may be water, but using an acid aqueous solution mixed with malic acid, citric acid, sulfuric acid, etc., or a metal chloride aqueous solution such as cobalt chloride or nickel chloride for the purpose of increasing the reaction rate. Also good. Further, as a solid reactant 1, a mixture of a solid organic acid such as malic acid or citric acid, a metal chloride such as nickel chloride or cobalt chloride, a solid such as a noble metal and a metal hydride is hydrogenated as an aqueous solution 2 for reaction. An aqueous solution of a boron compound may be used. The aqueous reaction solution 2 is preferably made highly alkaline with sodium hydroxide or the like in order to improve the stability of the reaction product. In the present embodiment, sodium borohydride (NaBH ₄ ) is used for the solid reactant 1 and malic acid aqueous solution is used for the reaction aqueous solution 2.

  As another example, hydrogen generation accompanying metal dissolution may be applied. In this case, it is possible to use a base metal such as aluminum or magnesium for the solid reactant 1 and an acid aqueous solution or an alkali aqueous solution for the reaction aqueous solution 2. The above is not particularly limited, and any reaction that generates hydrogen by reacting with liquid water is applicable.

  Next, in FIG. 1, the solution container 20 is disposed outside the reaction container 10, and both are shown separately. On the other hand, although not shown, both may be integrated, or the solution container 20 may be disposed inside the reaction container 10. Further, the supply control device 31 can send and stop the reaction aqueous solution 2 using a pump. It is also possible to use the supply control device 31 as a valve to send and stop the reaction aqueous solution 2 using the differential pressure between the reaction vessel 10 and the solution vessel 20. Although not shown, the supply controller 31 may be installed in the solution container 20 as a pump, and the solution supply control may be performed by pressurizing or depressurizing the inside of the solution container 20.

  When the aqueous reaction solution 2 is supplied to the solid reactant 1, a hydrogen generation reaction occurs. In the reaction of sodium borohydride, hydrogen and sodium metaborate are generated. Although the hydrogen production reaction proceeds at a very high speed, the reaction rate gradually decreases due to the increase in the pH of the aqueous solution for reaction 2 during the reaction and the increase in sodium metaborate around the sodium borohydride. Here, since the hydrogen generation reaction is a reaction involving liquid water, hydrogen bubbles are generated during hydrogen generation.

  Bubble foam film is composed of residual products such as sodium metaborate and unreacted water, but sodium metaborate is highly hydratable and its water mixture is highly viscous, so it forms a strong foam film To do. That is, the bubbles are difficult to break, and once the bubbles are formed, the shape is maintained for a long time.

  Further, since the total amount of sodium borohydride dissolved in water does not react rapidly, the residual product contains unreacted sodium borohydride. This unreacted substance gradually reacts with the moisture in the foam film, and a phenomenon of generating bubbles is observed.

  It was confirmed that the volume of such bubbles as a whole decreased with increasing temperature. The following can be considered as this reason. First, as the temperature rises, the viscosity of the foam film decreases, and it becomes easy to break the foam. In addition, a hydrogen generation reaction between unreacted sodium borohydride and water contained in the foam film is promoted to reduce the amount of unreacted substances, thereby making it difficult to generate new bubbles.

  Therefore, in the present invention, the air bubbles are brought into contact with the heat supply unit 40 and heated. The holding unit 11 holding the solid reactant 1 has a container shape, and bubbles generated inside the holding unit 11 flow out of the holding unit 11 and come into contact with the heat supply unit 40. A heater was used for the heat supply unit 40. In FIG. 1, the holding unit 11 has an L-shaped cross section, but the shape of the holding unit 11 is not limited to this, and the generated bubbles are directed from the holding unit 11 to the heat supply unit 40. Any structure that flows into It is also possible to define a bubble moving direction by forming a bubble channel using a channel plate, and to make a structure in which the bubble and the heat supply unit 40 are always in contact with each other.

  The reason why the heat supply unit 40 is waved in FIG. 1 is to increase the contact area between the bubbles and the heat supply unit 40. In addition, the structure of the heat supply unit 40 may be a structure that increases the contact area by making it porous or arranging a plurality of heat supply units 40.

  Using the structure described above, the temperature of the heater was set to 80 ° C. to generate a hydrogen generation reaction, and it was found that the volume of bubbles was reduced.

  Moreover, although not shown in figure, the same experiment was done by attaching a metal foam to the heater surface. As a result, the volume of bubbles was further reduced. Therefore, compared with the case where a metal foam is not attached to the heater surface, the volume of the reaction vessel 10 can be reduced to 75%.

  Thereby, the whole apparatus can be reduced in size.

(Embodiment 2)
FIG. 2 is a cross-sectional view illustrating a schematic configuration of the hydrogen generator according to the second embodiment.

  As shown in FIG. 2, the present embodiment is the same as the first embodiment except that heat transfer units 43 a and 43 b are used instead of the heat supply unit 40 that sends power from the power source 42 while being controlled by the control unit 41. is there. The heat transfer parts 43a and 43b are heat pipes. The heat transfer unit 43a was installed inside the holding unit 11, and the heat transfer unit 43b connected to the heat transfer unit 43a was installed in the bubble flowing unit outside the holding unit 11. In FIG. 2, the heat transfer unit 43 a is disposed on the side surface of the holding unit 11, but the heat transfer unit 43 a may be disposed on the bottom surface and the solid reactant 1 may be placed on the heat transfer unit 43 a. Moreover, it becomes possible to move reaction heat more efficiently by inserting the heat transfer part 43a into the bottom surface or side surface of the holding part 11 or by using the plate of the holding part 11 as a heat transfer part. . The heat transfer parts 43a and 43b are not limited to heat pipes, and may be heat conductive members such as metal and carbon. Further, if the product outlet of the holding unit 11 is slightly narrowed, the amount of heat leakage from other than the heat transfer unit 43a is reduced, and the reaction heat due to the reaction between the solid reactant 1 and the aqueous solution for reaction 2 can be efficiently transferred to the bubbles. It became possible.

  In FIG. 1 showing the first embodiment and FIG. 2 showing the second embodiment, the reaction product is shown as a granular solid reaction product, but is not limited to this. It does not matter.

  With this configuration, when heat is generated by the hydrogen generation reaction generated inside the holding unit 11, heat can be efficiently extracted by the heat transfer unit 43a, and the heat is transmitted to the heat transfer unit 43b. When the bubbles flowing out from the holding unit 11 come into contact with the heat transfer unit 43b, the volume of the bubbles can be reduced. In addition, since a power supply from the outside is not required and a control unit, a signal line, and a power line are not required, a hydrogen generation apparatus having a small volume and a small energy loss can be obtained.

(Embodiment 3)
FIG. 3 is a cross-sectional view illustrating a schematic configuration of the hydrogen generator according to the third embodiment.

  As shown in FIG. 3, the present embodiment is an example in which the solid reactant 1 is directly fixed to the heat transfer section 43 and the heat transfer section 43 is extended around the fixed portion. This is the same as in the second mode. Moreover, the solid reactant 1 was fixed by pressing the solid reactant 1 in the direction of the arrow in FIG. To enable this immobilization method, solid reactant 1 was pelletized. In addition, the solid reactant 1 may not be pressed against the heat transfer section 43 by the pressing component 13, but if not pressed, the unreacted solid reactant 1 rides on the flow of the residual product or the aqueous solution 2 for reaction. It is more preferable that the solid reactant 1 is pressed by the pressing component 13 because it becomes difficult to control the reaction by flowing out and the heat transfer efficiency of the reaction heat to the heat transfer section 43 decreases.

  Although stainless steel is used for the heat transfer portion 43, other members may be used as long as they are members that conduct heat. For example, simple substances such as iron, nickel, titanium, and carbon, alloys, mixtures, ceramics, and the like can be raised, and stainless steel and noble metals are more preferable. Further, if the solid reactant 1 is not pressed by the pressing component 13, a flexible material or an elastic body in which a heat good conductor is attached to or mixed with a resin or fiber is partially or entirely included in the heat transfer portion 43. You may use for.

  In the present embodiment, reaction heat is used for bubble heating as in the second embodiment. The solution flow path 30 is arranged so that the aqueous solution for reaction 2 is supplied near the contact portion of the solid reactant 1 with the heat transfer section 43 so that heat can be efficiently transferred to the heat transfer section 43 that heats the bubbles. .

  When hydrogen generation reaction occurs and bubbles are generated, the bubbles spread to the periphery, move on the heat transfer portion 43 around the solid reactant 1 and receive heat, so that the growth of bubbles is suppressed and volume reduction is confirmed.

  The heat transfer part 43 shown in FIG. 3 has a bent part on the surface in order to increase the contact area with the generated bubbles and to transfer heat efficiently. The heat transfer portion 43 may be a flat plate, but is more preferably a shape that increases the contact area. For example, the heat transfer part 43 may be a porous body, a net, a nonwoven fabric, or a plate having a through hole. If the plate has a through hole, heat can be received more efficiently when the bubbles pass through the through hole. In addition, by providing a plurality of protrusions on the surface of the heat transfer unit 43, forming grooves, attaching particles, etc., the surface is provided with irregularities, and the contact area between the bubbles and the heat transfer unit 43 can be increased. Good. Furthermore, it is more preferable that the heat transfer section 43 is composed of a water-containing member having water retention property, because bubbles are familiar with the surface and heat is easily transmitted.

  In the present embodiment, only one heat transfer section 43 is shown, but a plurality of heat transfer sections 43 may be provided. Moreover, although not shown in figure, the arrangement direction of the heat-transfer part 43 may be perpendicular | vertical. In the vertical case, the solid reactant 1 needs to be pressed against the heat transfer section 43 by the pressing component 13. In this case, since the bubbles move to the bottom of the container while being in contact with the heat transfer section 43, the volume of the bubbles is smaller when the bubbles reach the bottom of the container, leading to the miniaturization of the reaction container 10. As shown in FIG. 3, when the arrangement direction of the heat transfer section 43 is horizontal, since the bubbles do not move due to their own weight, the time for the bubbles to stay in the heat transfer section 43 becomes longer, and the effect of bubble breakage and bubble volume reduction increases. In any case, the location of the heat transfer section 43 in the reaction vessel 10 may be any location as long as bubbles are in contact with the heat transfer section 43 without reaching the hydrogen discharge section 12. It is preferable to install in a lower part than the part 12.

  In addition, it cannot be overemphasized that the material, structure, arrangement | positioning direction, and arrangement | positioning location of the heat-transfer part 43 described by this embodiment are applied also to the heat supply part 40 in Embodiment 1. FIG.

(Embodiment 4)
FIG. 4 is a cross-sectional view showing a schematic configuration around the reaction part of the solid reactant 1 and the aqueous solution 2 for reaction in the hydrogen generator according to Embodiment 4. (a) is a side sectional view, and (b) is a top view.

  In the present embodiment, the groove 45 is provided on the surface where the heat transfer section 43 contacts the solid reactant 1. Other configurations are the same as those of the third embodiment. Needless to say, the shape of the groove 45 is not limited to the shape shown in FIG. The aqueous reaction solution 2 supplied from the solution channel 30 passes through the groove 45 and is supplied to the heat transfer section 43 side of the solid reactant 1. The solid reactant 1 does not need to be fixed or pressed to the heat transfer section 43. However, if the solid reactant 1 is fixed or pressed, the reaction heat is more easily transferred to the heat transfer section 43, and the bubbles are formed in the solid reactant 1. It is more preferable to be fixed or pressed because it is easy to be discharged from between the heat transfer section 43 and to receive heat from the heat transfer section 43.

  Thereby, since heat can be efficiently transmitted to the bubbles, the volume of the bubbles can be reduced and the reaction vessel can be downsized.

(Embodiment 5)
FIG. 5 is a cross-sectional view illustrating a schematic configuration of the hydrogen generator according to the fifth embodiment.

  In the present embodiment, a flow path plate 47 that defines the moving direction of bubbles is provided between the solid reactant 1 and the hydrogen discharger 12. Other configurations are the same as those of the third embodiment. The flow path plate 47 may have a function as a heat transfer section.

  Thereby, since the movement direction of a bubble can be prescribed | regulated, it becomes easy to make a bubble contact the heat-transfer part 43. FIG. Further, as shown in FIG. 5, even when the hydrogen discharge part 12 is provided in the lower part of the reaction vessel 2 or when the posture of the reaction vessel 2 is changed, the bubbles do not reach the hydrogen discharge part 12 and heat transfer is performed. The heat can be received from the portion 43 and the volume can be reduced.

(Embodiment 6)
FIG. 6 is a cross-sectional view illustrating a schematic configuration of a hydrogen generator according to Embodiment 6.

  In the present embodiment, as shown in FIG. 6, the solid reactant 1 is directly fixed to the heat transfer section 43, an opening is provided at the position of the heat transfer section 43 in contact with the solid reactant 1, The solid reaction product 1 is covered with a container-shaped holding unit 11. Moreover, the holding | maintenance part 11 may be comprised with the member similar to the heat-transfer part 43, and will become easy to transmit reaction heat with a bubble with this structure. Other configurations are the same as those of the third embodiment. Although stainless steel is used for the heat transfer portion 43, other members may be used as long as they are members that conduct heat. The solid reactant 1 was fixed by pressing the solid reactant 1 in the direction of the arrow in FIG. 6 with the pressing component 13 attached to the holding portion 11 and pressing it against the heat transfer portion 43.

  In the present embodiment, reaction heat is used for bubble heating as in the third embodiment. The solution flow path 30 is connected to the heat transfer section 43 so that the reaction aqueous solution 2 can be supplied from the opening provided in the heat transfer section 43 because the reaction heat is efficiently supplied to the heat transfer section 43 that heats the bubbles. This is to be able to communicate. With this structure, a reaction can occur at the interface between the solid reactant 1 and the heat transfer section 43, and the heat transfer section was efficiently heated by the reaction heat.

  Bubbles generated by the reaction moved around and behind the heat transfer unit 43 through the outlet of the holding unit 11. When the bubbles contacted the heat transfer part 43, the volume of the bubbles was reduced, and the increase of bubbles was also suppressed.

  Moreover, in this structure, since the circumference | surroundings of the solid reactant 1 were covered with the holding | maintenance part 11 and the bubble exit was controlled, the path | route which a bubble moves was decided. As a result, a hydrogen generator capable of responding to the posture change can be obtained.

(Embodiment 7)
FIG. 7 is a cross-sectional view showing a schematic configuration around the reaction part of the solid reactant 1 and the reaction aqueous solution 2 in the hydrogen generator according to the seventh embodiment. (a) is a side sectional view, and (b) is a top view of the heat transfer section.

  In the present embodiment, as shown in FIG. 7, a heat transfer section internal solution flow path 32 communicating with the solution flow path 30 is provided in the heat transfer section 43, and the contact surface of the heat transfer section 43 with the solid reactant 1 is provided. A supply port 34 for supplying the reaction aqueous solution 2 was provided. Other configurations are the same as those of the sixth embodiment.

  Needless to say, the shape and number of the heat transfer section internal solution flow channel 32 and the supply port 34 are not limited to those shown in FIG. The solid reactant 1 may or may not be fixed or pressed to the heat transfer section 43, but is more preferably fixed or pressed.

  Further, the connection part of the solution flow path 30 is not limited to the solid reaction product 1 side of the heat transfer part 43 as shown in FIG. The connection part of the solution flow path 30 and the heat transfer part internal solution flow path 32 is provided on the surface opposite to the solid reactant 1 of the heat transfer part 43, and the aqueous solution for reaction 2 is connected to the solid reactant 1 of the heat transfer part 43. Supply from the opposite surface, or provide a connection portion between the solution flow path 30 and the heat transfer section internal solution flow path 32 on the side surface of the heat transfer section 43, and supply the reaction aqueous solution 2 from the side face of the heat transfer section 43. Also good.

  Further, the heat transfer section 43 may be arranged horizontally as shown in FIG. 7 or may be arranged vertically.

  Accordingly, the reaction aqueous solution 2 is supplied to the solid reactant 1 from the heat transfer section internal solution flow path 32 through the supply port 34, so that the reaction occurs closer to the heat transfer section 43. For this reason, reaction heat is more efficiently transmitted to the heat transfer unit 43, and the generated bubbles are more likely to receive heat from the heat transfer unit 43, and the volume of the bubbles can be efficiently reduced.

(Embodiment 8)
FIG. 8 is a cross-sectional view illustrating a schematic configuration of the hydrogen generator according to the eighth embodiment.

  In this embodiment, a liquid is used as the reactant. For example, the reactant can be an aqueous solution of a borohydride compound, and the aqueous solution for reaction can be an aqueous acid solution or an aqueous metal chloride solution. In order to improve the stability, the reaction product is preferably made highly alkaline with sodium hydroxide or the like.

  As shown in FIG. 8, in this embodiment, the reactant container 21 for storing the liquid reactant 3, the reactant channel 36 for supplying the liquid reactant 3 to the heat transfer section 43c, and the supply of the liquid reactant 3 are controlled. A supply control device 38 is provided. Other configurations are the same as those of the third embodiment.

  The liquid reactant 3 is supplied from the reactant container 21 through the reactant channel 36 to the heat transfer section 43 c under the control of the supply control device 38. The aqueous reaction solution 2 is supplied from the solution container 20 through the solution flow path 30 to the heat transfer section 43 c under the control of the supply control device 31. The heat transfer section 43c has such a shape that it can be mixed without flowing out to other places when the aqueous solution for reaction 2 and the liquid reactant 3 are supplied. For example, a concave shape as shown in FIG. The heat transfer section 43c is connected to the heat transfer section 43d, and the reaction heat when the reaction aqueous solution 2 and the liquid reactant 3 react on the heat transfer section 43c is transmitted to the heat transfer section 43d. Bubbles generated by the reaction move from the heat transfer section 43c to 43d. During this time, the bubbles receive heat and can be reduced in volume.

(Embodiment 9)
FIG. 9 is a diagram showing an outline of a fuel cell system according to Embodiment 9, where the same members are denoted by the same reference numerals, and redundant descriptions are omitted.

  The fuel cell system according to this embodiment shown in FIG. 9 is a system in which the hydrogen generator shown in FIG. 6 is connected to the fuel cell. That is, the fuel cell includes a power generation unit 50 and an anode chamber 51 in contact with the anode of the power generation unit 50. The anode chamber 51 is a space that temporarily holds hydrogen consumed by the anode. The anode chamber 51 and the reaction vessel 10 are connected by the hydrogen discharge unit 12, and hydrogen generated in the reaction vessel 10 is supplied to the anode chamber 51. The hydrogen generator is not limited to that shown in FIG. 6, but any of the other hydrogen generators shown in FIGS. 1 to 5, 7, and 8 can be used.

  By using the hydrogen generator of the present application, since a residual product does not flow out from the hydrogen generator, it is possible to provide a small fuel cell system that can supply power stably. As mentioned above, although each embodiment of the present invention was described, the present invention is not limited to these embodiments. Moreover, it cannot be overemphasized that the structure of each above-mentioned embodiment may be combined.

It is sectional drawing which shows schematic structure of the hydrogen generator which concerns on Embodiment 1 of this invention. It is sectional drawing which shows schematic structure of the hydrogen generator based on Embodiment 2 of this invention. It is sectional drawing which shows schematic structure of the hydrogen generator based on Embodiment 3 of this invention. It is sectional drawing which shows schematic structure of the reaction part periphery of the solid reaction material and aqueous solution for reaction of the hydrogen generator which concerns on Embodiment 4 of this invention. (a): Side sectional view, (b): Top view It is sectional drawing which shows schematic structure of the hydrogen generator based on Embodiment 5 of this invention. It is sectional drawing which shows schematic structure of the hydrogen generator based on Embodiment 6 of this invention. It is sectional drawing which shows schematic structure of the reaction part periphery of the solid reaction material and aqueous solution for reaction of the hydrogen generator which concerns on Embodiment 7 of this invention. (a): Cross-sectional side view, (b): Top view of heat transfer section It is sectional drawing which shows schematic structure of the hydrogen generator based on Embodiment 8 of this invention. It is sectional drawing which shows schematic structure of the fuel cell system which concerns on Embodiment 9 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solid reactant 2 Reaction aqueous solution 3 Liquid reactant 10 Reaction container 11 Holding part 12 Hydrogen discharge part 13 Press part 20 Solution container 21 Reactant container 30 Solution flow path 31 Supply control device 32 Heat transfer part internal solution flow path 34 Supply Port 36 Reactant flow path 38 Supply control device 40 Heat supply section 41 Control section 42 Power supply 43, 43a, 43b, 43c, 43d Heat transfer section 45 Groove 47 Channel plate 50 Power generation section 51 Anode chamber

Claims (5)

A fuel gas generation device that generates a fuel gas by reacting an aqueous solution for reaction with a reactant,
A fuel gas generation device comprising: a heat supply unit configured to supply heat to a residual product generated by a reaction between the reaction aqueous solution and the reactant. The heat supply section is a heat transfer section that transfers heat generated by the reaction between the reaction aqueous solution and the reactant to the residual product,
The fuel gas generation device according to claim 1, wherein the reaction proceeds in the vicinity of the heat transfer section. The reactant is a solid reactant;
The solid reactant is fixed to the heat transfer section,
The fuel gas generation device according to claim 2, wherein the reaction between the aqueous reaction solution and the solid reactant occurs at a contact surface between the solid reactant and the heat transfer unit.   The fuel gas generation device according to claim 1, wherein the heat supply unit includes a water-containing member having water retention.   5. A fuel cell system comprising: an anode chamber to which the fuel gas is supplied; and the fuel gas generation device according to claim 1 as a fuel gas supply means to the anode chamber. .

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