JP2008002748A - System and method for utilizing combustion heat of exhausted hydrogen gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology which efficiently and effectively utilizes combustion heat generated by catalytic combustion of an exhausted hydrogen gas. <P>SOLUTION: The exhausted hydrogen gas is blown into a reaction chamber of an exhausted hydrogen gas treatment device 28 in a state of receiving a number of reactant particles and a heat transfer tube 80 for circulating a heat exchange medium in the reaction chamber to form a fluidized bed of the reactant particles, and the catalytic combustion of the exhausted hydrogen gas is performed in the fluidized bed. The heat exchange medium is supplied into the heat transfer tube 80 from heat transfer medium supply means 88, 90 under such circumference, the heat exchange is performed between the reactant particles heated or generated by catalytic combustion and a combustion exhaust gas, and the heat exchange medium to heat the heat exchange medium, and the heated heat exchange medium is led out to the external through a heat exchange medium lead-out passage 86 to be utilized in heat exchange medium utilizing equipment 96. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a combustion heat utilization system and method for exhaust hydrogen gas, and more particularly to a technology that can effectively use heat generated when catalytic treatment is performed on exhaust hydrogen gas containing hydrogen gas.

  As is well known, in various devices and mechanisms, hydrogen gas is discharged alone or mixed with other gases. For example, a fuel cell system, an absorption refrigerator, an electrolytic treatment apparatus for a substance containing hydrogen element, or the like. The so-called exhaust hydrogen gas composed of hydrogen gas or a mixed gas containing it exhausted from these various devices and mechanisms is flammable and is extremely dangerous if exhausted as it is into the atmosphere. Therefore, in general, an exhaust hydrogen gas processing device is installed in an apparatus or mechanism that generates such exhaust hydrogen gas, and the exhaust hydrogen gas is processed in such a processing device so that there is no problem in terms of safety. It is designed to be discharged into the atmosphere.

  Such exhaust hydrogen gas treatment apparatuses have various structures. For example, as an exhaust hydrogen gas treatment device installed in a fuel cell system, (a) hydrogen off-gas exhausted from the anode electrode side of the fuel cell is diluted with air exhausted from the cathode electrode side, And (b) hydrogen off-gas is brought into contact with the catalyst in the presence of exhaust air from the cathode electrode side to cause catalytic combustion. The thing provided with the structure (for example, refer the following patent document 2) etc. are known. Among them, in particular, in the exhaust hydrogen gas treatment device having the structure (a), the exhaust hydrogen gas is burned and consumed, so that the exhaust hydrogen gas is simply diluted (a). Compared to devices with a structure, the concentration of hydrogen gas in exhaust gas can be reduced more reliably, and combustion of exhaust hydrogen gas is due to catalytic combustion with a relatively low combustion temperature. As a result, it is possible to exhibit an excellent feature that it can be safely performed while advantageously suppressing the generation of NOx.

  By the way, in a fuel cell system in which these exhaust hydrogen gas treatment devices are incorporated, as is well known, exhaust heat generated during power generation by a fuel cell has been used for various purposes. On the other hand, in the exhaust hydrogen gas processing apparatus having the structure (a) described above, combustion heat is inevitably generated during the combustion process of the exhaust hydrogen gas. Although it is used as a heat source for heating raw fuel and reforming air (see, for example, Patent 3 below), it is usually dissipated through the outer wall of the processing apparatus or the like along with combustion exhaust gas. It is released in and is hardly used.

  Further, even in the conventional exhaust hydrogen gas combustion heat utilization system that uses the combustion heat of the exhaust hydrogen gas generated in the exhaust hydrogen gas processing apparatus as a heat source for heating the raw fuel for reforming or reforming air, Although heat exchange is performed between the combustion exhaust gas generated by catalytic combustion of exhaust hydrogen gas and the raw fuel for reforming or reforming air, the heat of the combustion exhaust gas is recovered, The heat of the catalyst heated by the catalytic combustion of hydrogen gas is not recovered at all and is not utilized at all. Therefore, it is difficult to say that such a conventional exhaust hydrogen gas combustion heat utilization system can sufficiently utilize the combustion heat of the exhaust hydrogen gas.

JP 2004-127666 A JP 2003-142131 A JP 2002-198076 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the heat generated when the exhaust hydrogen gas is treated by catalytic combustion is more efficiently used. Another object of the present invention is to provide a combustion heat utilization system and method for exhaust hydrogen gas that can be used effectively.

  In the present invention, in order to solve such a problem, the gist of the present invention is to contact exhaust hydrogen gas containing hydrogen gas exhausted from various devices and mechanisms with the catalyst in the presence of air. (A) a gas introduction port and a gas discharge port, wherein the exhaust hydrogen gas and the air are A reaction chamber configured to be introduced from the gas inlet and to be circulated in the interior toward the gas outlet, and at least a part of the reaction particles made of the catalyst contained in the reaction chamber. By blowing the discharged hydrogen gas and the air into the reaction chamber through the gas introduction port and fluidizing the many reaction particles in the reaction chamber, Reactive particles An exhaust hydrogen gas treatment device configured to catalytically combust the exhaust hydrogen gas in a fluidized bed of the reaction particles formed in the reaction chamber, b) Heat exchange is performed between the reaction particles that are accommodated in the reaction chamber of the exhaust hydrogen gas treatment device and heated by catalytic combustion of the exhaust hydrogen gas, and combustion exhaust gas generated by the catalyst combustion. A heat transfer medium configured such that a heat exchange medium for recovering heat of the reaction particles and the combustion exhaust gas can be circulated therein; and (c) the heat exchange medium is connected to one end side of the heat transfer pipe. A heat exchange medium supply means for supplying the heat transfer tube into the heat transfer tube through an opening of the heat transfer tube, and (d) provided on the end portion side opposite to the one end side of the heat transfer tube and heated by recovery of heat by the heat exchange. The heat exchange medium A heat exchange medium lead-out path led out of the reaction chamber in the exhaust hydrogen gas treatment device; and (e) heat for using the heat exchange medium led out of the reaction chamber in the heat exchange medium lead-out path It is in the combustion heat utilization system of exhaust hydrogen gas characterized by including an exchange medium utilization facility.

  That is, in the exhaust hydrogen gas combustion heat utilization system according to the present invention, the exhaust hydrogen gas can be catalytically combusted in the fluidized bed of the reaction particles formed in the reaction chamber of the exhaust hydrogen gas processing device. In addition, since the heat transfer tube in which the heat exchange medium is circulated is placed in the reaction chamber in which such a fluidized bed is formed, the heat transfer tube is discharged in the fluidized bed. The combustion exhaust gas generated by catalytic combustion of hydrogen gas and a large number of reaction particles heated by the catalytic combustion are sufficiently brought into contact with each other. As a result, during catalytic combustion of exhaust hydrogen gas, not only between the heat exchange medium circulated in the heat transfer pipe and the combustion exhaust gas, but also between the heat exchange medium and a large number of heated reaction particles is extremely sufficient. In addition, heat exchange is performed reliably, and the heat of each of the flue gas and the heated reaction particles can be advantageously recovered.

  In addition, since the fluidized bed of reactive particles is formed by blowing the exhausted hydrogen gas and air into the reaction chamber of the exhausted hydrogen gas treatment device, the exhausted hydrogen gas and all the reactive particles Are contacted sufficiently and efficiently, and catalytic combustion of the exhaust hydrogen gas is caused uniformly and efficiently by utilizing all the reaction particles almost entirely in the reaction chamber, whereby the reaction The overall temperature in the room is made as uniform as possible. Therefore, heat exchange between the combustion exhaust gas and the heated reaction particles and the heat exchange medium can be efficiently performed over the entire heat transfer tube accommodated in the reaction chamber.

  Therefore, in the exhaust gas combustion heat utilization system according to the present invention as described above, the heat generated when the exhaust hydrogen gas is catalytically burned and processed is recovered extremely efficiently and used more effectively. It can be done.

Aspects of the Invention

  By the way, the present invention can be suitably implemented at least in various aspects as listed below.

<1> A system for utilizing the heat generated when a catalyst is combusted and processed by bringing exhaust hydrogen gas containing hydrogen gas discharged from various devices and mechanisms into contact with the catalyst in the presence of air. And (a) having a gas inlet and a gas outlet, and the discharged hydrogen gas and the air can be introduced from the gas inlet and circulated through the interior toward the gas outlet. A reaction chamber configured as described above, a large number of reaction particles at least partially made of the catalyst housed in the reaction chamber, and the exhaust hydrogen gas through the gas inlet into the reaction chamber. A fluidized bed forming means for forming a fluidized bed of the reaction particles in the reaction chamber by fluidizing the numerous reaction particles in the reaction chamber by blowing the air, and formed in the reaction chamber The reaction particles made An exhaust hydrogen gas treatment device configured to catalytically combust the exhaust hydrogen gas in a fluidized bed of a child; and (b) the exhaust hydrogen gas treatment device is accommodated in the reaction chamber of the exhaust hydrogen gas treatment device, and the exhaust A heat exchange medium for performing heat exchange between the reaction particles heated by catalytic combustion of hydrogen gas and the combustion exhaust gas generated by the catalyst combustion, and recovering heat of the reaction particles and the combustion exhaust gas, A heat transfer tube configured to be circulated, (c) heat exchange medium supply means for supplying the heat exchange medium into the heat transfer tube through an opening on one end side of the heat transfer tube, and (d) the above Heat that is provided on the end side opposite to the one end side of the heat transfer tube, and that guides the heat exchange medium heated by the recovery of heat by the heat exchange to the outside of the reaction chamber in the exhaust hydrogen gas treatment device. Derivation of exchange media And (e) a heat exchange medium utilization facility for utilizing the heat exchange medium led out of the reaction chamber through the heat exchange medium lead-out path. Combustion heat utilization system.

<2> In aspect <1> described above, the heat exchange medium is heat exchange water. According to this aspect, the heat exchange water can be effectively used, for example, as hot water (hot water) supplied from a hot water supply facility.

<3> In the above aspect <1> or aspect <2>, the exhaust hydrogen gas is a hydrogen off-gas exhausted from the anode electrode side of the fuel cell. According to this aspect, it is possible to more efficiently and effectively use the combustion heat generated when the hydrogen off-gas discharged from the anode electrode side of the fuel cell is treated by catalytic combustion.

<4> In any one of the above aspects <1> to <3>, the reaction particles accommodated in the reaction chamber in the exhaust hydrogen gas treatment device are made of a material different from the catalyst. The catalyst is supported on a support. According to this aspect, it is possible to advantageously increase the surface area of the catalyst that one reactive particle has, that is, the contact area of the catalyst with the exhaust hydrogen gas, and thereby the exhaust hydrogen gas can be more efficiently Combustion processing can be performed. As a result, efficient recovery of the combustion heat generated by such a hydrogen off-gas combustion process can also be realized advantageously, and the effective use of the combustion heat of such exhaust hydrogen gas can be further advantageously promoted.

<5> In the aspect <4> described above, the granular carrier is composed of a granular porous body having a large number of communication holes communicating with the outside, and the catalyst includes an outer surface of the granular porous body and an inner surface of the communication hole. In addition, it must be supported respectively. According to this embodiment, the total number of catalysts of one reactive particle can be advantageously increased, and this also makes it possible to effectively realize further efficiency of the exhaust hydrogen gas combustion treatment. Thus, the effective use of the combustion heat of the exhaust hydrogen gas can be further promoted.

<6> In any one of the above aspects <1> to <5>, the heat transfer particles having a high thermal conductivity made of a material different from the catalyst are the exhaust hydrogen gas treatment. A large number of the reaction particles are accommodated in the reaction chamber of the apparatus. According to this embodiment, in the fluidized bed formed in the reaction chamber, for example, in order to ensure sufficient fluidity to ensure good heat transfer in the reaction chamber, the reaction particles, that is, the catalyst Need to be used in excess of the amount required for the combustion reaction with the exhaust hydrogen gas. If a material cheaper than the catalyst is used as the material for the heat transfer particles, the manufacturing cost and running cost of the exhaust hydrogen gas treatment device, and thus the exhaust hydrogen gas combustion heat utilization system as a whole, can be advantageously reduced. .

<7> Said aspect <6> WHEREIN: The said heat-transfer particle is comprised with the granular porous body provided with many communicating holes connected to the exterior. According to this aspect, the heat transfer particles are advantageously reduced in weight, and the surface area is increased, so that better fluidity and excellent heat transfer can be ensured in the fluidized bed. As a result, the combustion heat generated by the combustion treatment of the hydrogen off gas can be efficiently recovered, and the effective utilization of the combustion heat of the exhaust hydrogen gas can be further advantageously promoted.

<8> In any one of the modes <1> to <7> described above, the exhaust hydrogen gas and the air are passed through the gas inlet into the reaction chamber of the exhaust hydrogen gas processing apparatus. In a state in which the combined gas of the discharged hydrogen gas and the air, which are merged by the merging unit and introduced into the reaction chamber from the gas introduction port, is dispersed, and the merging unit that merges before introduction. Dispersing means for allowing the reaction chamber to circulate is further provided. According to this embodiment, the exhaust hydrogen gas and air are uniformly dispersed in a mixed state throughout the reaction chamber, whereby the exhaust hydrogen gas in the fluidized bed formed in the reaction chamber. And the reaction reaction between the reaction particles, that is, the combustion treatment of the exhaust hydrogen gas can be more efficiently advanced. Also by this, the effective use of the combustion heat of the exhaust hydrogen gas can be further advantageously promoted.

<9> In any one of the above aspects <1> to <8>, the reaction chamber has an outlet for taking out the plurality of reaction particles from the inside, and the fluidized bed The reaction particles are configured to be prevented from being detached from the outlet in the formed state. According to this embodiment, for example, when the catalytic performance of the reaction particles accommodated in the reaction chamber is reduced due to long-term use of the apparatus, such reaction particles are taken out from the reaction chamber, and sufficient catalyst is obtained. Replacing with new reactive particles with performance can be easily performed. As a result, good treatment performance of the exhaust hydrogen gas can be stably maintained at as low a cost as possible by exchanging the reaction particles, so that the combustion heat of the exhaust hydrogen gas is more stable. Can be used effectively.

<10> A method of utilizing heat generated when a catalyst is combusted and processed by bringing exhaust hydrogen gas including hydrogen gas discharged from various devices and mechanisms into contact with the catalyst in the presence of air. The exhausted hydrogen gas and the air are blown into the reaction chamber in which a large number of reaction particles, at least a part of which are made of the catalyst, are accommodated, and the heat transfer tube is accommodated. The reaction particles are fluidized to form a fluidized bed of the reaction particles in the reaction chamber, and the exhaust hydrogen gas is catalytically combusted and processed in the fluidized bed, while heat exchange is performed in the heat transfer tube. Supplying a medium, heat exchange is performed between the reaction particles heated by catalytic combustion of the exhaust hydrogen gas and the heat exchange medium, or between combustion exhaust gas generated by the catalytic combustion and the heat exchange medium. The heat exchange medium heated by the heat recovery by the heat exchange after recovering the heat of the reaction particles and the combustion exhaust gas is led out of the reaction chamber and used. To use combustion heat of exhaust hydrogen gas.

  In this embodiment, the heat transfer tube makes sufficient contact with the combustion exhaust gas generated by catalytic combustion of exhaust hydrogen gas and a large number of reactive particles heated by the catalytic combustion in the fluidized bed of reactive particles. I'm damned. In addition, catalytic combustion of the exhaust hydrogen gas is induced uniformly and efficiently using all the reaction particles in almost the entire reaction chamber, thereby making the entire temperature in the reaction chamber as uniform as possible. It becomes. As a result, the heat exchange between the combustion exhaust gas and the heated reaction particles and the heat exchange medium is performed more fully and efficiently throughout the heat transfer tube, and a large number of those heated with the combustion exhaust gas are heated. The heat of each of the reactive particles can be recovered more advantageously.

  Therefore, according to this embodiment as described above, the heat generated when the exhaust hydrogen gas is subjected to catalytic combustion and processed can be recovered very efficiently and used more effectively.

<11> In the aspect <10> described above, the heat exchange medium is heat exchange water. According to this aspect, the heat exchange water can be effectively used as, for example, hot water supplied from a hot water supply facility.

  Hereinafter, in order to clarify the present invention more specifically, an embodiment of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 schematically shows the overall configuration of an embodiment of a combustion heat utilization system for exhaust hydrogen gas having a structure according to the present invention. In FIG. 1, reference numeral 10 denotes a fuel cell, which has a known power generation structure including an anode electrode and a cathode electrode (not shown).

  That is, in the fuel cell 10, the high-pressure hydrogen tank 12 and the air pump 14 are connected via the hydrogen gas supply path 16 and the air supply path 18, respectively. Is supplied from the high-pressure hydrogen tank 12 to the anode electrode of the fuel cell 10 through the hydrogen gas supply path 16, while pressurized air is supplied from the air pump 14 to the cathode electrode of the fuel cell 10 through the air supply path 18. It is like that. A known electrode reaction using the raw material hydrogen gas supplied to each electrode and oxygen in the air is induced between the anode electrode and the cathode electrode, thereby generating a predetermined amount of electric power. It is supposed to be.

  Further, an anode pipe 20 and a cathode pipe 22 are further connected to the fuel cell 10. Then, hydrogen off-gas (exhaust hydrogen gas) containing unreacted hydrogen gas exhausted from the anode electrode side and air off-gas containing air exhausted from the cathode electrode side are anode pipe 20 and cathode pipe 22. Each is led to the outside.

  Further, an on-off valve 21 such as an electromagnetic valve is provided in the middle of the anode pipe 20. In addition, a connecting path 24 that connects the anode pipe 20 and the hydrogen gas supply path 16 is provided upstream of the on-off valve 21 in the anode pipe 20 in the hydrogen off-gas flow direction. The circulation pump 26 is installed.

  Thus, here, when the circulating pump 26 is operated in the closed operation state of the on-off valve 21, the hydrogen off-gas containing unreacted hydrogen gas led to the outside through the anode pipe 20 is connected to the connection path 24 and the hydrogen. Through the gas supply path 16, the anode electrode is supplied again and circulated. Then, the on-off valve 21 is periodically opened to perform a purge operation. At this time, the hydrogen off-gas circulated through the anode pipe 20, the connection path 24, and the hydrogen gas supply path 16 becomes the anode pipe. 20 is intermittently sent from the on-off valve 21 toward the downstream side in the hydrogen off-gas flow direction, so that the anode pipe 20 can be circulated toward the tip side. Further, under the operating state of the air pump 14, the air off gas is always allowed to flow through the cathode pipe 22 toward the tip end side.

  In the combustion heat utilization system of the present embodiment, the hydrogen off-gas treatment device 28 as the exhaust hydrogen gas treatment device for catalytically burning and treating the hydrogen off-gas emitted from the fuel cell 10 as described above is connected to the anode pipe 20. And are connected to the cathode pipe 22.

  More specifically, as shown in FIG. 2, the hydrogen off-gas treatment apparatus 28 includes an apparatus main body 34 that includes a cylindrical container 30 and a lid 32. The cylindrical container 30 constituting the apparatus main body 34 is composed of a metal cylinder having a cylindrical shape with a bottom on one side, further including a lower bottom 36 and an upper opening 38 opening upward. Yes. The lid 32 is made of a metal disk having a diameter that is slightly larger than the upper opening 38 of the cylindrical container 30.

  And this lid body 32 is piled up by the annular-plate-shaped outer flange part 40 integrally formed in the upper end side outer peripheral surface of the cylindrical container 30 in the outer peripheral part of the lower surface, A cylindrical container 30 is positioned so as to cover the upper opening 38, and the lid body 32 and the cylindrical container 30 are welded to each other at the overlapping positions under such an arrangement state. As a result, they are integrally and fluid-tightly joined.

  That is, the apparatus main body 34 of the hydrogen off-gas treatment apparatus 28 is composed of a metal cylinder with a bottom on both sides made of an integrally joined product of the cylindrical container 30 and the lid 32, and such an apparatus. The internal space of the main body 34 is a reaction chamber 42 in which catalytic combustion (combustion reaction) of hydrogen off-gas discharged from the anode electrode side of the fuel cell 10 is caused, as will be described later.

  The reaction chamber 42 contains a large number of fine reaction particles 44 that are brought into contact with the hydrogen off gas. As schematically shown in FIG. 3, the reaction particles 44 are constituted by a large number of granular catalysts 46 in the form of fine particles supported on a granular carrier 48 having a sufficiently larger particle diameter. .

  That is, here, the granular carrier 48 is made of a granular porous body having a large number of communicating holes 50 communicating with the outside, and the surface of the granular carrier 48 made of this granular porous body or the inner surface of the communicating holes 50. In contrast, the granular catalyst 46 is attached and supported in a larger amount so that the reaction particles 44 are formed. As a result, in the reaction chamber 42, one of the reaction particles 44 having a particle size suitable for forming a fluidized bed, which will be described later, is formed as compared with a case where the single particle catalyst 46 is used. Thus, the total surface area of the granular catalyst 46 of the single reaction particle 44 can be made larger. Note that the reaction particles 44 having such a structure are conventionally operated by, for example, immersing a granular carrier 48 in a dispersion in which a large number of granular catalysts 46 are dispersed, and then taking out and drying the granular carrier 48. It can be easily formed by a known method.

  In addition, the particulate catalyst 46 is formed by using a known catalyst capable of catalytic combustion by contact with hydrogen gas in the presence of air. The type of catalyst constituting the granular catalyst 46 is not particularly limited, and is appropriately selected from known ones. That is, for example, a single catalyst selected from precious metal catalysts such as platinum and palladium and a non-metallic catalyst such as cobalt oxide is used alone, or a plurality of catalysts are combined in various ways to form a granular catalyst 46. It is used as a forming material.

  The material of the granular carrier 48 is not particularly limited, and any material can be used as long as it can support the granular catalyst 46 made of the type of catalyst exemplified above. In this case, ceramic particles made of alumina or the like are preferably used as a material for forming the granular carrier 48 because it has excellent moldability, high thermal conductivity, and sufficient strength.

  Thus, in the reaction particles 44, as will be described later, the hydrogen off-gas discharged from the anode electrode side of the fuel cell 10 is blown into the reaction chamber 42 together with the air off-gas discharged from the cathode electrode side of the fuel cell 10. As a result, it is easily fluidized in the reaction chamber 42, and in such a fluid state, the granular catalyst 46 of the reaction particles 44 comes into contact with the hydrogen off-gas over the entire surface having a sufficiently large area. The hydrogen off gas can be catalytically combusted.

  The size of the reaction particles 44 is not limited at all, and may be any size that can be easily fluidized by hydrogen off-gas or air off-gas blown into the reaction chamber 42. That is, from this point of view, the average particle diameter of the reaction particles 44 is appropriately determined according to the flow rate of the hydrogen off-gas or air off-gas blown into the reaction chamber 42, but in general, , About 100 to 200 μm. In addition, the size of the granular catalyst 46 is not specified, and is sufficiently small so that it is reliably supported in a larger amount on the granular carrier 48 and the total surface area becomes larger. It is desirable that In FIG. 3, the reaction particles 44 and further the heat transfer particles 52 to be described later show the flow state clearly, so that the reaction particles 44 and the heat transfer particles 52 are extremely larger than actual. It should be understood that this is exaggerated.

  As apparent from FIG. 2, a large number of heat transfer particles 52 are accommodated in the reaction chamber 42 of the apparatus main body 34 together with a large number of reaction particles 44. Although not shown in the figure, the heat transfer particles 52 are composed of a granular porous body having a large number of communicating holes communicating with the outside, like the granular carrier 48 of the reaction particles 44, and has an advantageously large surface area. Has been. In this case, a ceramic material such as alumina is used as a material for forming the heat transfer particles 52, thereby providing the heat transfer particles 52 with high thermal conductivity and sufficient strength. And good moldability are ensured.

  Thus, even a large number of the heat transfer particles 52 can be easily fluidized together with the many reaction particles 44 in the reaction chamber 42 by blowing hydrogen off-gas and air off-gas into the reaction chamber 42. It is supposed to be. As a result, in this embodiment, the number of the reaction particles 44 accommodated in the reaction chamber 42 is suppressed to the smallest possible number, and a fluidized bed having good fluidity is ensured in the reaction chamber 42. To be formed. In addition, a large number of fluidized heat transfer particles 52 are efficiently brought into contact with the reaction particles 44 heated by the combustion heat generated by catalytic combustion of hydrogen off gas and the combustion exhaust gas generated by such catalytic combustion. Thus, heat is received from the reaction particles 44 and the combustion exhaust gas, so that the internal temperature of the entire reaction chamber 42 can be made as uniform as possible.

  The material for forming the heat transfer particles 52 is not particularly limited as long as it has a high thermal conductivity, but among such materials, in addition to the illustrated ceramic material, silica sand and shirasu balloon Are preferably used from the viewpoint that they can exhibit excellent strength and lightness. Further, the size of the heat transfer particles 52 is not particularly limited as in the case of the reaction particles 44 described above, and the hydrogen off-gas or air off-gas blown into the reaction chamber 42 is facilitated to facilitate fluidization. In general, the thickness is about 100 to 200 μm, although it is appropriately determined according to the flow rate and the like.

  In the hydrogen off-gas treatment device 28, a circular shape penetrating in the thickness direction in the center of the lid 32 in the device main body 34 in which a large number of reaction particles 44 and heat transfer particles 52 are accommodated. A gas discharge port 54 is formed. In addition, on the upper surface of the lid body 32, the cylindrical discharge pipe connecting tube portion 56 having the same inner diameter as the gas discharge port 54 is positioned coaxially with the gas discharge port 54. Are integrally formed so as to protrude upward from the peripheral edge of the opening with a predetermined height. Thereby, the reaction chamber 42 in the apparatus main body 34 is communicated with the outside through the gas discharge port 42 and the inner hole of the discharge pipe connecting cylinder portion 56 on the upper side. In addition, a discharge pipe 58 is connected to the discharge pipe connecting cylinder portion 56. The discharge pipe 58 is opened to the atmosphere at the tip portion opposite to the connection side to the discharge pipe connecting cylinder portion 56.

  Further, here, the reaction particles 44 and the heat transfer particles 52 can be taken in and out through the gas discharge port 54. That is, the gas discharge port 54 serves as an outlet for the reaction particles 44 and the heat transfer particles 52. In this embodiment, since the gas discharge port 54 is provided in the lid 32 formed at the upper end of the apparatus main body 34, the reaction particles 44 and the heat transfer particles 52 are formed as described later. Even when fluidized by injecting hydrogen off-gas and air off-gas into the reaction chamber 42, the particles 44, 52 jump out to the outside through the gas discharge port 54 so that they can be separated from the reaction chamber 42. It can be prevented before anything happens.

  On the other hand, a gas introduction port 60 penetrating in the thickness direction is formed at the center of the lower bottom portion 36 of the cylindrical container 30 in the apparatus main body 34. The gas introduction port 60 has a circular shape having a diameter sufficiently larger than that of the gas discharge port 54 and a diameter slightly smaller than that of the lower bottom portion 36.

  A cylindrical joint 62 is connected to the gas introduction port 60. The cylindrical joint 62 has a cylindrical portion 64 having a relatively large outer diameter and a low height that can be inserted into the gas inlet 60 and a bottom portion 66 that closes the lower opening of the cylindrical portion 64. It has a single-sided bottomed cylindrical overall shape.

  Further, in the cylindrical portion 64 of the cylindrical joint 62, the internal space is a merge space 68, and a dispersion plate 70 as a dispersion means is fixed to the upper portion of the merge space 68. It is installed. The dispersion plate 70 has the same structure as that generally used in a fluidized bed apparatus or the like for forming a fluidized bed. For example, the entire flat plate made of a heat-resistant material such as a ceramic material or a metal material is provided with a large number of fine through-holes penetrating in the thickness direction, and the gas blown toward one surface is It has a structure that can be uniformly blown out from the front surface of the other surface through the through hole. Then, such a dispersion plate 70 covers the upper opening of the cylindrical portion 64 in a state where the lower surface is exposed in the merge space 68 inside the cylindrical portion 64 of the cylindrical joint 62, It is fixedly arranged.

  On the other hand, at the bottom 66 of the cylindrical joint 62, a small-diameter hydrogen off-gas inlet 72 and a large-diameter air off-gas inlet 74 penetrating in the thickness direction are positioned side by side in the radial direction. It has been drilled. Further, on the lower surface of the bottom portion 66, a small-diameter cylindrical anode pipe connecting cylinder portion 76 having the same inner diameter as that of the hydrogen off-gas introduction port 72 is positioned coaxially with the hydrogen off-gas introduction port 72, and In the state where the large-diameter cylindrical cathode pipe connecting cylinder portion 78 having the same inner diameter as the air off-gas inlet 74 is positioned coaxially with the air off-gas inlet 74, the hydrogen off-gas inlet 72 and the air The off-gas inlet 74 is integrally formed so as to protrude downward from each opening peripheral edge with a predetermined height.

  The cylindrical joint 62 is inserted into the gas inlet 60 of the apparatus main body 34 at the upper end of the cylindrical part 64, and the outer peripheral surface of the upper end of the cylindrical part 64 and the gas inlet 60 of the apparatus main body 34. The inner peripheral surface is integrally and fluid-tightly joined by welding or the like. As a result, the reaction chamber 42 in the apparatus main body 34 and the internal space of the cylindrical joint 62 are communicated with each other, and the reaction chamber 42 has a merging space 68 in the cylindrical joint 62 and a hydrogen off-gas on the lower side. The inlet port 72 and the inner hole of the anode pipe connecting cylinder part 76 and the air off gas inlet port 74 and the inner hole of the cathode pipe connecting cylinder part 78 are communicated with the outside.

  Thus, the anode pipe connection cylinder portion 76 of the cylindrical joint 62 connected to the apparatus main body 34 is extended from the anode electrode side of the fuel cell 10 and discharged from the anode electrode side. An anode pipe 20 through which the hydrogen off gas is circulated is connected at the tip thereof. Further, the cathode pipe connection cylinder portion 78 of the cylindrical joint 62 has a cathode pipe 22 that extends from the cathode electrode side of the fuel cell and through which air off-gas discharged from the cathode electrode side flows. Connected at the tip.

  Thus, in the combustion heat utilization system of the present embodiment having the hydrogen off-gas treatment device 28 having such a structure, the cathode electrode is operated in accordance with the operation of the air pump 14 for supplying air to the cathode electrode of the fuel cell 10. The air off gas that is always discharged from the side and circulated in the cathode pipe 22 is always allowed to flow into the merge space 68 from the air off gas introduction port 74 of the cylindrical joint 62, while being provided on the anode pipe 20. The hydrogen off-gas discharged from the anode electrode side and circulated through the anode pipe 20 by the purge operation by the periodic opening operation of the on-off valve 21 passes through the hydrogen off-gas inlet 72 of the cylindrical joint 62 into the merge space 68. In addition, it can be made to flow intermittently.

  In addition, the hydrogen off-gas and the air off-gas that have flowed into the merge space 68 of the cylindrical joint 62 are merged and mixed there to be a mixed (merged) gas. Through the many through holes of the dispersion plate 70, the gas is introduced into the reaction chamber 42 in a state of being uniformly dispersed from the gas introduction port 60 of the apparatus main body 34, and is allowed to flow toward the gas discharge port 54. It has become.

  Then, a large number of reaction particles 44 and a large number of heat transfer particles 52 are contained in the reaction chamber 42 by the mixed gas that is blown into the reaction chamber 42 and flows in the reaction chamber 42 toward the gas discharge port 54. 2 is fluidized so as to be in a convection state as indicated by a thick arrow in FIG. 2, so that a fluidized bed of these many reaction particles 44 and heat transfer particles 52 is formed in the reaction chamber 42. It has become. As is apparent from these, in the present embodiment, the fluidized bed forming means is configured by the anode pipe 20 and the on-off valve 21, the cathode pipe 22 and the air pump 14.

  Thus, in the fluidized bed thus formed, the granular catalyst 46 of the reaction particles 44 and the hydrogen off gas are brought into contact with each other in the presence of air in the air off gas, and the hydrogen off gas is catalytically combusted. It is like that. Further, combustion exhaust gas mixed with water vapor generated by catalytic combustion of such hydrogen off-gas and the remaining high-temperature air is discharged from the gas discharge port 54 in a state where the hydrogen gas concentration is made as zero as possible. It is allowed to flow into the pipe 58 and further to be discharged into the atmosphere through the tip opening of the discharge pipe 58.

  In the present embodiment system, particularly, as shown in FIGS. 1 and 2, the combustion heat generated when the hydrogen off-gas is subjected to catalytic combustion by the hydrogen off-gas treatment device 28 as described above. A structure for recovering and using it is provided.

  That is, here, with respect to the cylindrical container 30 in the apparatus main body 34 of the hydrogen off-gas treatment apparatus 28, a heat transfer tube 80 through which heat exchange water as a heat exchange medium can circulate is partially inside the reaction chamber 42. It is assembled in a state of being housed in the housing. The heat transfer tube 80 is made of a metal tube having a predetermined length and having a high thermal conductivity, such as aluminum, and the intermediate portion in the length direction is a heat exchanging portion 82 extending meanderingly. In addition, one end side portion in the length direction is a heat exchange water introduction portion 84 having a heat exchange water introduction port (not shown), and the other end side portion in the length direction is a heat exchange water. The heat exchange water lead-out portion 86 is provided as a heat exchange water lead-out path provided with a water exchange outlet (not shown).

  The heat exchanging portion 82 is located in the cylindrical housing 30 in the apparatus main body 34 of the hydrogen off-gas treatment apparatus 28 from the lower portion proximal to the lower bottom 36 to the upper portion proximal to the lid 14. Between the above, the reaction particles 44 and the heat transfer particles 52 are disposed so as to extend in a meandering manner across the entire portion where the fluidized bed of the heat transfer particles 52 is formed. On the other hand, the heat exchange water introduction portion 84 and the heat exchange water lead-out portion 86 are arranged at the end portion on the side opposite to the heat exchange portion 82 so that the introduction port and the lead-out port are respectively positioned outside. The cylindrical container 30 is positioned through the cylindrical wall portion. In other words, the heat transfer tube 80 accommodates the heat exchanging portion 82 and the end portions of the heat exchanging water introducing portion 84 and the heat exchanging water outlet 86 on the heat exchanging portion 82 side in the reaction chamber 42. On the other hand, the end portions of the heat exchange water introduction portion 84 and the heat exchange water lead-out portion 86 opposite to the heat exchange portion 82 side where the introduction port and the discharge port are provided are arranged outside the reaction chamber 42. The cylindrical housing 30 is assembled in a state of being protruded to the cylindrical housing 30.

  Further, in such a heat transfer tube 80, the introduction port of the heat exchange water introduction part 84 and the introduction of the heat exchange water lead part 86, which are projected to the outside from the reaction chamber 42 in the apparatus main body 34 of the hydrogen off gas treatment device 28, are introduced. Among the outlets, the former is connected to the water pipe 90 via an opening / closing valve 88 such as an electromagnetic valve, while the latter is surrounded by, for example, a heat insulating material via an opening / closing valve 92 such as an electromagnetic valve. Thus, it is connected to the hot water supply pipe 94 provided with heat insulation. And this hot water supply pipe 94 is opened toward the inside of hot water storage tank 96, such as a bath tub, in the front-end | tip opening part.

  Thus, in the hydrogen off-gas combustion heat treatment system according to this embodiment, the hydrogen off-gas is generated in the fluidized bed of the reaction particles 44 and the heat transfer particles 52 formed in the reaction chamber 42 in the apparatus main body 34 of the hydrogen off-gas treatment apparatus 28. In the state where the on-off valve 92 on the heat exchange water deriving portion 86 is closed while the catalyst combustion is being performed or prior to the implementation of such catalyst combustion, the heat exchange water introduction portion 84 of the heat transfer tube 80 is closed. When the opening / closing valve 88 provided between the water pipe 90 and the water pipe 90 is opened, the tap water in the water pipe 90 is introduced into the heat transfer pipe 80 as heat exchange water, and the heat exchange water introduction section 84. After that, the heat exchange section 82 can be made to flow.

  Then, as the catalytic combustion of hydrogen off gas in the fluidized bed in the reaction chamber 42 proceeds as described above, a large number of reaction particles 44 heated by the catalytic combustion, the combustion exhaust gas generated by the catalytic combustion, and the heat transfer tube 80 The heat exchange is performed with the tap water that has flowed into the heat exchange section 82, and the heat of the heated reaction particles 44 and the heat of the combustion exhaust gas are transferred to the tap water in the heat exchange section 82. As a result, the tap water in the heat exchanging unit 82 is heated to be warm water. Then, when the tap water in the heat exchanging unit 82 is heated, the on-off valve 92 on the heat exchanging water deriving unit 86 is opened so that the hot water is circulated in the hot water supply pipe 94. The hot water 98 is poured into the hot water storage tank 96 and stored through the opening at the tip, and the hot water 98 in the hot water storage tank 96 is used for various purposes. As is clear from this, in this embodiment, the heat exchange medium supply means is constituted by the water pipe 90 and the on-off valve 88, and the heat exchange medium utilization facility is constituted by the hot water storage tank 96. ing.

  As described above, in the hydrogen off-gas combustion heat treatment system according to this embodiment, the reaction particles 44 and the reaction particles 42 are placed in the reaction chamber 42 of the hydrogen off-gas treatment apparatus 28 in which the heat exchange part 82 of the heat transfer tube 80 is accommodated. Since a fluidized bed of heat transfer particles 52 is formed and catalytic combustion of hydrogen off gas is performed in the fluidized bed, the heat exchanging portion 82 of the heat transfer tube 80 is formed in the fluidized bed. Thus, the reaction particles 44 and the heat transfer particles 52 heated by the catalytic combustion of hydrogen off gas can be sufficiently and reliably brought into contact with the combustion exhaust gas generated by the catalytic combustion.

  Therefore, unlike the conventional system in which the heat exchange is performed only between the heat exchange medium and the combustion exhaust gas during the catalytic combustion of the exhaust hydrogen gas, the water that is allowed to flow into the heat exchange section 82 of the heat transfer tube 80. Not only between the water and the combustion exhaust gas, but also between the tap water and the heated reaction particles 44 and the heat transfer particles 52, heat exchange is performed sufficiently and surely so that the combustion exhaust gas is heated. The heat possessed by each of the reaction particles 44 and the heat transfer particles 52 can be efficiently recovered.

  Moreover, since the fluidized bed of the reaction particles 44 and the heat transfer particles 52 is formed by injecting hydrogen off-gas into the reaction chamber 42, all the reaction particles 44 and The hydrogen off-gas is brought into contact with the hydrogen off-gas sufficiently and efficiently, and catalytic combustion of the hydrogen off-gas is caused uniformly and efficiently using all the reaction particles 44 almost entirely in the reaction chamber 42. Thereby, the entire temperature in the reaction chamber 42 is made as uniform as possible. Therefore, heat exchange between the combustion exhaust gas, the heated reaction particles 44 and the heat transfer particles 52 and the tap water is performed over the entire heat exchange portion 82 of the heat transfer tube 80 accommodated in the reaction chamber 42. Can be done more efficiently.

  Therefore, according to the hydrogen offgas combustion heat utilization system according to the present embodiment as described above, the combustion heat generated when the hydrogen offgas discharged from the fuel cell 10 is subjected to catalytic combustion to be processed efficiently and more sufficiently. Thus, it is possible to obtain hot water more easily and stably, and such hot water can be used very easily and more effectively.

  Further, in the present embodiment, the reaction particles 44 accommodated in the reaction chamber 42 of the hydrogen off-gas treatment device 28 are formed on the surface of the granular carrier 48 made of a granular porous body having a large number of communication holes 50 and each communication hole. Since a large number of fine granular catalysts 46 are supported on the inner surface of 50, the total surface area of the granular catalyst 46 included in one reactive particle 44 is sufficiently increased. Thereby, the contact area of the granular catalyst 46 with respect to the hydrogen off gas (mixed gas of hydrogen off gas and air off gas) in the reaction chamber 42 can be increased more effectively, and catalytic combustion of the hydrogen off gas can be further increased. It can be implemented more efficiently. As a result, efficient recovery of combustion heat generated by catalytic combustion of such hydrogen off gas can be advantageously realized, and effective use of such combustion heat can be promoted more effectively.

  Furthermore, in the present embodiment, in the reaction chamber 42 of the hydrogen off-gas treatment device 28, a large number of heat transfer particles 52 are fluidized together with a large number of reaction particles 44, and the reaction particles 44 and the heat transfer particles 52 are separated. A fluidized bed is formed. Therefore, the amount of the granular catalyst 46 used is, for example, suppressed to a minimum amount necessary for reliably burning the hydrogen off-gas introduced into the reaction chamber 42 of the apparatus main body 34, and good fluidity is obtained. The fluidized bed can be reliably and easily formed. As a result, the material cost required for the hydrogen off-gas combustion process can be kept as low as possible, and the effective use of the combustion heat generated by the hydrogen off-gas combustion process can also be realized economically advantageously. Can be done.

  In addition, of course, by using the heat transfer particles 52 made of a granular porous body having high thermal conductivity, the heat of the reaction particles 44 or the combustion exhaust gas heated or generated by catalytic combustion of hydrogen off gas is transferred to the heat transfer. Can be advantageously transmitted to the particles 52, whereby excessive temperature rise in the reaction chamber 42 during the catalytic combustion of such hydrogen off-gas is advantageously eliminated, so that the hydrogen off-gas combustion treatment, and thus such combustion treatment, can be performed. There is also an advantage that the effective use of the combustion heat generated by the above can be realized more safely.

  Furthermore, in the combustion heat utilization system of the present embodiment, the hydrogen offgas and air are joined and mixed in the joining space 68 in the cylindrical joint 62 of the hydrogen offgas processing device 28, and then the dispersion plate. 70 can be blown into the reaction chamber 42 of the apparatus main body 34. As a result, a mixed gas of hydrogen off-gas and air is uniformly dispersed throughout the reaction chamber 42, whereby the hydrogen off-gas in the fluidized bed formed in the reaction chamber 42 and the reaction particles 44 ( The particulate catalyst 46) can be brought into contact more efficiently and reliably. As a result, the combustion treatment of the hydrogen off gas is further promoted more efficiently, and the effective utilization of the combustion heat generated by the catalytic combustion of the hydrogen off gas can be promoted more effectively.

  In the system of the present embodiment, the reaction particles 44 and the heat transfer particles 52 accommodated in the reaction chamber 42 of the hydrogen off-gas treatment device 28 are in a non-fluidized state (hydrogen off-gas and air off-gas are contained in the reaction chamber 42. In the state where it is not blown in), the catalyst performance of the granular catalyst 46 in the reaction particles 44 can be reduced by, for example, long-term use of the hydrogen off-gas treatment device 28, etc. When lowered, such reactive particles 44 can easily be replaced with new reactive particles 44 having sufficient catalytic performance. Therefore, good processing performance of the hydrogen off gas can be stably maintained by a simple operation of exchanging the reaction particles 44 and at as low a cost as possible, which is the combustion heat generated by catalytic combustion of the hydrogen off gas. It can greatly contribute to the stable and effective use of.

  The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.

  For example, in the above-described embodiment, heat exchange water composed of tap water is introduced into the heat transfer tube 80 housed in the reaction chamber 42 of the hydrogen offgas treatment device 28 as the heat exchange medium, and the reaction chamber 42 By heating the heat exchange water in the heat transfer tube 80 with the combustion heat generated by the catalytic combustion of the hydrogen off gas induced in the heat transfer water, it is possible to effectively use the combustion heat. The type of heat exchange medium introduced into the heat transfer tube 80 and the utilization form of the heat exchange medium heated by the combustion heat are not limited to this.

  That is, for example, a liquid such as silicon oil other than water, various gases, or the like can be used as the heat exchange medium. In addition, the heat exchange medium is heated by the combustion heat generated by catalytic combustion of hydrogen off gas, and then warms up the fuel cell 10 incorporated in the fuel cell system, the raw material supplied to the reformer, etc. In addition to being used for heating and the like, it can also be used as a heat source for various heaters. As is clear from this, the heat exchange medium utilization facility is not limited to the illustrated hot water storage tank such as a bath tub or the like, and produces the type of heat exchange medium used and exhausted hydrogen gas. It can be changed as appropriate according to the type of device or mechanism, the location where it is installed, the environment, and the like. Also, the heat exchange medium supply means can be variously changed depending on the type of heat exchange medium used.

  Further, the structure of the reaction particles 44 accommodated in the reaction chamber 42 of the hydrogen off-gas treatment device 28 as the exhaust hydrogen gas treatment device is not particularly limited to the illustrated one, and at least a part of the structure is the hydrogen off-gas ( What is necessary is just to be comprised with the catalyst which can carry out catalytic combustion of the discharge | emission hydrogen gas). Accordingly, it is of course possible to form the reaction particles 44 only with such catalyst particles.

  In the above embodiment, a large number of heat transfer particles 52 are accommodated in the reaction chamber 42 of the hydrogen off-gas treatment device 28 together with a large number of reaction particles 44. Although the fluidized bed is formed, there is no problem even if the heat transfer particles 52 are omitted and the fluidized bed is formed in the reaction chamber 42 only by the reaction particles 44.

  Furthermore, fluidized bed forming means for forming a fluidized bed by fluidizing the heat transfer particles 52 and the reaction particles 44 or fluidizing only the reaction particles 44 when the heat transfer particles 52 are omitted. Needless to say, the structure is not limited to the examples.

  In addition, the present invention catalyzes combustion of hydrogen off-gas discharged from the fuel cell of the fuel cell system, hydrogen gas discharged from various devices and mechanisms, or a mixed gas containing hydrogen gas. It goes without saying that the present invention can be advantageously applied to any of the exhaust heat treatment system and method of exhaust hydrogen gas that uses the heat generated during processing.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is explanatory drawing which shows roughly the structure of one Embodiment of the combustion heat utilization system of exhaust hydrogen gas according to this invention. FIG. 2 is an explanatory diagram including a partially cutaway view showing a part of the system in an enlarged manner in order to explain the exhaust hydrogen gas processing apparatus incorporated in the exhaust hydrogen gas combustion heat utilization system shown in FIG. 1. FIG. 2 is an enlarged cross-sectional explanatory view schematically showing reaction particles accommodated in a reaction chamber of an exhaust hydrogen gas processing apparatus incorporated in the exhaust hydrogen gas combustion heat utilization system shown in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fuel cell 12 High pressure hydrogen tank 14 Air pump 20 Anode piping 21, 88, 92 On-off valve 22 Cathode piping 28 Hydrogen off-gas processing apparatus 42 Reaction chamber 44 Reactive particle 52 Heat transfer particle 54 Gas discharge port 60 Gas introduction port 80 Heat transfer tube 82 Heat Exchange part 84 Heat exchange water introduction part 86 Heat exchange water outlet part 90 Water pipe 96 Hot water storage tank

Claims (5)

A system for utilizing the heat generated when the exhausted hydrogen gas including hydrogen gas exhausted from various devices and mechanisms is brought into contact with the catalyst in the presence of air to cause catalytic combustion and processed,
A reaction having a gas inlet and a gas outlet, and configured such that the discharged hydrogen gas and the air can be introduced from the gas inlet and circulated inside the gas outlet. A chamber, a large number of reaction particles at least partially made of the catalyst, contained in the reaction chamber, and the exhaust hydrogen gas and the air are blown into the reaction chamber through the gas inlet. A fluidized bed forming means for forming a fluidized bed of the reaction particles in the reaction chamber by fluidizing the numerous reaction particles in the reaction chamber, and the reaction particles formed in the reaction chamber An exhaust hydrogen gas treatment device configured to catalytically combust the exhaust hydrogen gas in a fluidized bed;
Heat exchange is performed between the reaction particles heated by catalytic combustion of the exhaust hydrogen gas and the combustion exhaust gas generated by the catalyst combustion, which is placed inside the reaction chamber of the exhaust hydrogen gas treatment device. A heat transfer tube configured to allow a heat exchange medium for recovering the heat of the reaction particles and the combustion exhaust gas to be circulated therein;
Heat exchange medium supply means for supplying the heat exchange medium into the heat transfer tube through an opening on one end side of the heat transfer tube;
The heat exchange medium, which is provided on the end side opposite to the one end side of the heat transfer tube and is heated by collecting heat by the heat exchange, is led out of the reaction chamber in the exhaust hydrogen gas processing apparatus. A heat exchange medium outlet path;
A heat exchange medium utilization facility for utilizing the heat exchange medium led out of the reaction chamber in the heat exchange medium lead-out path;
An exhaust hydrogen gas combustion heat utilization system characterized by comprising   The combustion heat utilization system for exhaust hydrogen gas according to claim 1, wherein the heat exchange medium is heat exchange water.   The combustion heat utilization system for exhaust hydrogen gas according to claim 1 or 2, wherein the exhaust hydrogen gas is a hydrogen off-gas exhausted from the anode electrode side of the fuel cell. A method of utilizing the heat generated when the exhausted hydrogen gas including the hydrogen gas exhausted from various devices and mechanisms is brought into contact with the catalyst in the presence of air to cause catalytic combustion to be processed,
The exhausted hydrogen gas and the air are blown in a state in which a heat transfer tube is placed in a reaction chamber containing at least a part of the reaction particles made of the catalyst, so that the multiple reactions in the reaction chamber are performed. The particles are fluidized to form a fluidized bed of the reaction particles in the reaction chamber, and the exhausted hydrogen gas is catalytically combusted and processed in the fluidized bed, while a heat exchange medium is disposed in the heat transfer tube. To exchange heat between the reaction particles heated by catalytic combustion of the exhaust hydrogen gas and the heat exchange medium, or between combustion exhaust gas generated by the catalytic combustion and the heat exchange medium. The heat exchange medium heated by the heat recovery by the heat exchange after recovering the heat of the reaction particles and the combustion exhaust gas is led out of the reaction chamber and used. Discharged water Combustion heat utilization method for a gas. The method for using combustion heat of exhaust hydrogen gas according to claim 4, wherein the heat exchange medium is heat exchange water.

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