JP2016183874A - Hydrogen recoupling device and nuclear power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydrogen recoupling device capable of suitably generating an initial catalytic reaction.SOLUTION: A hydrogen recoupling device 30 provided in a nuclear power plant where natrium which is a liquid metal is used as a coolant includes: an atmosphere flow path 43 through which the atmosphere in the nuclear power plant flows; a catalyst part 32 provided to the atmosphere flow path 43 for generating steam by coupling the hydrogen and the oxygen contained in the atmosphere through a catalytic reaction; and an upstream side filter member 33 provided on the atmosphere flow path 43 at the upstream side of the catalyst part 32 in the atmosphere direction covering partially the catalyst part 32.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hydrogen recombination apparatus and a nuclear power plant that combine hydrogen and oxygen by a catalytic reaction.

  2. Description of the Related Art Conventionally, a sodium aerosol removing device that removes sodium aerosol generated by leakage and burning of sodium handled in a nuclear power plant such as a fast breeder reactor is known (see, for example, Patent Document 1).

JP 2001-124893 A

  By the way, when generation | occurrence | production of the severe accident of nuclear power plants, such as a fast reactor, hydrogen may generate | occur | produce with a sodium aerosol. For this reason, it is desirable to install an apparatus for treating hydrogen in such a nuclear power plant. As such an apparatus, a hydrogen recombination apparatus that adsorbs hydrogen and oxygen on the catalyst surface, combines the adsorbed hydrogen and oxygen by a catalytic reaction, and discharges them as water vapor can be considered. However, when sodium aerosol is generated, the sodium aerosol adheres to the catalyst surface and hinders the adsorption of hydrogen and oxygen, so that the catalytic reaction is inhibited and it becomes difficult to treat hydrogen.

  Here, if a catalytic reaction occurs in a part of the catalyst, heat is transferred from the site where the catalytic reaction has occurred to the other site, and when the catalyst part to which the sodium aerosol is attached is heated, the sodium aerosol melts, or Since the catalyst surface can be exposed by volatilization, an initial catalytic reaction may be generated at least at a predetermined portion of the catalyst in order to properly operate the apparatus.

  Then, this invention makes it a subject to provide the hydrogen recombination apparatus and nuclear power plant which can generate an initial catalytic reaction suitably.

  The hydrogen recombination apparatus of the present invention is provided in an atmosphere flow path through which an atmosphere in the nuclear power plant circulates and in the atmosphere flow path in a hydrogen recombination apparatus provided in a nuclear power plant in which liquid metal is used as a coolant. A catalyst unit that combines hydrogen and oxygen contained in the atmosphere by a catalytic reaction to generate water vapor, and is provided in the atmosphere flow path upstream of the catalyst unit in the flow direction of the atmosphere, and at least the catalyst And an upstream side covering portion provided so as to cover a part of the portion.

  According to this configuration, since at least a part of the upstream side of the catalyst part can be covered with the upstream side covering part, the upstream side covering part can suppress the adhesion of the aerosol to the catalyst part. For this reason, an initial catalytic reaction can be generated in at least a part of the catalyst portion covered with the upstream side covering portion. Therefore, even when the aerosol adheres to the catalyst portion not covered with the upstream coating portion, heat is transferred from a part of the catalyst portion where the initial catalytic reaction has occurred, thereby melting the aerosol, The catalyst part can be exposed. Thereby, even if aerosol is generated, the catalytic reaction of the catalyst part can be suitably generated by exposing the catalyst part, so that hydrogen can be appropriately processed. Note that the upstream side covering portion may cover at least a part of the catalyst portion, or may cover the entire catalyst portion. In addition, the atmosphere channel may be formed using a casing in which an inlet and an outlet of the atmosphere are formed, or may be formed using a duct. Further, as the liquid metal, for example, sodium is used, and in this case, the generated aerosol is sodium aerosol.

  Moreover, it is preferable to further include a downstream covering portion provided in the atmosphere flow path on the downstream side of the catalyst portion in the direction of circulation of the atmosphere and provided to cover at least a part of the catalyst portion.

  According to this configuration, even at the downstream side of the catalyst part, at least a part of the catalyst part can be covered with the downstream coating part. For this reason, it can suppress that the aerosol which enters from the downstream of an atmosphere flow path adheres to a catalyst part.

  Moreover, it is preferable that the said upstream coating | coated part and the said downstream coating | coated part are filter members.

  According to this configuration, by using the filter member, it is possible to allow circulation of an atmosphere (gas) containing hydrogen, oxygen, and water vapor while suppressing intrusion of aerosol. In addition, as a filter member, the metal filter used as the mesh which can suppress infiltration of aerosol is applied, for example. Further, the filter member may be provided adjacent to the catalyst part or may be provided apart from the catalyst part.

  Moreover, it is preferable that the said upstream coating | coated part is a rotor which has a some blade | wing and rotates centering around a rotating shaft.

  According to this configuration, even if the aerosol enters from the upstream side of the atmosphere flow path and adheres to the rotor, the aerosol can be dropped by the centrifugal force and rotational vibration of the rotating rotor. For this reason, it can suppress that aerosol adheres to a catalyst part. The rotor may be configured to rotate passively by the rising air flow generated by the heat of the catalytic reaction, or may be configured to rotate by the power from the drive source.

  In addition, the rotation shaft has an axial direction provided along the circulation direction of the atmosphere, and the plurality of blades are mutually connected so as to block the atmosphere flow path when viewed from the axial direction of the rotation shaft. It is preferable that the arrangement is overlapped.

  According to this configuration, the aerosol contained in the atmosphere flowing between the blades easily collides with the plurality of blades, so that it is difficult for the aerosol to pass through the rotor. For this reason, it can suppress that aerosol adheres to a catalyst part.

  Each of the plurality of blades preferably has a catalyst layer that generates water vapor by combining hydrogen and oxygen contained in the atmosphere by a catalytic reaction at least on the surface.

  According to this configuration, even when the aerosol adheres to the plurality of blades, the aerosol can be melted and dropped by the heat of the catalytic reaction.

  Moreover, it is preferable that a water-repellent coating film is formed on the surface of each of the plurality of blades.

  According to this configuration, even when the aerosol adheres to the plurality of blades, the coating film can repel the aerosol and drop the aerosol.

  In addition, the upstream covering portion is a filter unit with a cleaning function, and the filter unit with a cleaning function cleans the filter member disposed at a removal position for removing the aerosol contained in the atmosphere, and the filter member It is preferable to have a cleaning unit that performs cleaning at a position and a moving unit that moves the filter member between the removal position and the cleaning position.

  According to this configuration, the moving member can move the filter member to which the aerosol is adhered to the cleaning position to clean the filter member, and the cleaned filter member can be moved to the removal position.

  In addition, it is preferable that the cleaning unit is a cleaning pool in which cleaning liquid is stored, and the moving unit moves the filter member to the cleaning position where the cleaning liquid is submerged in the cleaning liquid.

  According to this configuration, the filter member can be cleaned by being immersed in the cleaning pool.

  In addition, it is preferable that the moving unit includes a pair of pulleys and an annular belt member spanned between the pair of pulleys, and a plurality of the filter members are attached to the belt member.

  According to this configuration, the moving unit can sequentially move the plurality of filter members to the removal position and the cleaning position by rotating the belt member between the pair of pulleys.

  Moreover, it is preferable that the said moving part contains a pair of pulley and the said filter member is formed in the cyclic | annular belt spanned over the said pair of pulley.

  According to this configuration, the moving unit can continuously move the filter member to the removal position and the cleaning position by rotating the filter member between the pair of pulleys.

  Moreover, it is preferable that the said moving part moves the said filter member with dead weight of the aerosol adhering to the said filter member.

  According to this configuration, the moving unit can passively move the filter member using the weight of the aerosol. For this reason, since the moving part does not require power from the drive source, the filter member can be moved between the removal position and the cleaning position even in a situation where it is difficult to secure the power.

  Moreover, it is preferable that the said moving part moves the said filter member with the motive power from a drive source.

  According to this configuration, the moving unit can reliably move the filter member by the power from the drive source.

  Further, the upstream side covering portion is a filter unit, and the filter unit peels off the plurality of filter members stacked in the thickness direction and the filter member to which the aerosol adheres, thereby creating a new filter. It is preferable to have a filter peeling mechanism that exposes the member.

  According to this structure, a new filter member can be exposed by peeling off the filter member to which aerosol has adhered. For this reason, it can suppress that aerosol adheres to a catalyst part.

  Further, the nuclear power plant of the present invention is provided in a reactor vessel in which liquid metal is used as a primary coolant, a reactor containment vessel for storing the reactor vessel therein, and the reactor containment vessel. And a hydrogen recombination apparatus as described above.

  According to this configuration, even if aerosol and hydrogen are generated inside the reactor containment vessel, the hydrogen can be suitably processed using the hydrogen recombination apparatus.

  Further, the nuclear power plant of the present invention includes a nuclear reactor vessel in which liquid metal is used as a primary coolant, a nuclear reactor containment vessel that stores the nuclear reactor vessel therein, and a secondary that is heat-exchanged with the primary coolant. A secondary system facility in which liquid metal is used as a coolant, a building that houses the secondary system facility therein, and the hydrogen recombination device that is provided inside the building, To do.

  According to this configuration, even if aerosol and hydrogen are generated inside the building, the hydrogen can be suitably processed using the hydrogen recombination apparatus.

FIG. 1 is a schematic configuration diagram schematically illustrating a nuclear power plant in which a hydrogen recombination apparatus according to Embodiment 1 is provided. FIG. 2 is a cross-sectional view schematically showing the hydrogen recombination apparatus according to the first embodiment. FIG. 3 is a cross-sectional view schematically showing the hydrogen recombination apparatus according to the second embodiment. FIG. 4 is a cross-sectional view schematically showing the hydrogen recombination apparatus according to the third embodiment. FIG. 5 is a cross-sectional view schematically showing the hydrogen recombination apparatus according to the fourth embodiment. 6 is a cross-sectional view taken along the line AA in FIG. FIG. 7 is a cross-sectional view schematically showing the hydrogen recombination apparatus according to the fifth embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined, and when there are a plurality of embodiments, the embodiments can be combined.

[Embodiment 1]
FIG. 1 is a schematic configuration diagram schematically illustrating a nuclear power plant in which a hydrogen recombination apparatus according to Embodiment 1 is provided. FIG. 2 is a cross-sectional view schematically showing the hydrogen recombination apparatus according to the first embodiment.

  The hydrogen recombination apparatus 30 according to the first embodiment processes hydrogen generated in the nuclear power plant 10. First, the nuclear power plant 10 will be described prior to the description of the hydrogen recombination device 30.

  As shown in FIG. 1, the nuclear power plant 10 is a power plant including a nuclear reactor that generates a fission reaction by neutrons. As the nuclear reactor, for example, a fast breeder reactor 12 is applied. The fast breeder reactor 12 uses liquid metal as a coolant, and in the first embodiment, sodium is used. In addition to sodium, examples of the liquid metal include lead, bismuth, an alloy of lead and bismuth, mercury, potassium, and NaK (sodium potassium alloy).

  In this nuclear power plant 10, a reactor containment vessel 11 stores therein a fast breeder reactor 12, a primary main cooling system intermediate heat exchanger 13, and a primary main cooling system circulation pump 14. The fast breeder reactor 12, the primary main cooling system intermediate heat exchanger 13, and the primary main cooling system circulation pump 14 are connected by primary main cooling system pipes 15a, 15b, and 15c. Therefore, a primary sodium loop is formed by the fast breeder reactor 12, the primary main cooling system intermediate heat exchanger 13, the primary main cooling system circulation pump 14, and the primary main cooling system pipes 15a, 15b, and 15c. Therefore, when nuclear fuel undergoes fission in the core of the fast breeder reactor 12 and heat is generated, sodium is circulated by the primary main cooling system circulation pump 14, and this generated heat is absorbed by sodium and cooled.

  A building 20 is provided outside the reactor containment vessel 11, and a superheater 16 and an evaporator 17 as a steam generator and a secondary main cooling system circulation pump 18 are arranged inside the building 20. The superheater 16, the evaporator 17, and the secondary main cooling system circulation pump 18 are connected by secondary main cooling system pipes 19a, 19b, and 19c, and the secondary main cooling system pipe 19a is stored in the reactor. It penetrates into the container 11 and a part thereof is disposed in the primary main cooling system intermediate heat exchanger 13. Accordingly, a secondary sodium loop (secondary system equipment) is formed by the superheater 16, the evaporator 17, the secondary main cooling system circulation pump 18, and the secondary main cooling system pipes 19a, 19b, and 19c. By circulating sodium by the secondary main cooling system circulation pump 18, the heat of the primary sodium is absorbed and cooled by the secondary sodium in the primary main cooling system intermediate heat exchanger 13.

  The tertiary cooling system pipe 22 is arranged so as to pass through the superheater 16 and the evaporator 17. One end of the tertiary cooling system pipe 22 is connected to a steam turbine 23, and a generator 24 is connected to the steam turbine 23. The steam turbine 23 has a condenser 25, and a water intake pipe 26 and a drain pipe 27 for supplying and discharging cooling water (for example, seawater) are connected to the condenser 25. The intake pipe 26 has a circulating water pump 28, and the other end portion is disposed in the sea together with the drain pipe 27. The condenser 25 is connected to the other end of the tertiary cooling system pipe 22, and a water supply pump 29 is provided in the tertiary cooling system pipe 22. Therefore, a tertiary water loop is formed by the tertiary cooling system pipe 22, the steam turbine 23, and the condenser 25, and water is circulated by the feed water pump 29, so that the secondary system is connected by the superheater 16 and the evaporator 17. The sodium heat is absorbed by water and cooled.

  That is, the steam generated by exchanging heat with the secondary high-temperature sodium in the superheater 16 and the evaporator 17 is sent to the steam turbine 23 through the tertiary cooling system pipe 22, and the steam turbine 23 is caused by this steam. Driven to generate power by the generator 24. The steam that has driven the steam turbine 23 is cooled using seawater in the condenser 25 to become condensed water, and is returned to the superheater 16 and the evaporator 17 by the feed water pump 29.

  Here, in the nuclear power plant 10 that uses sodium as a coolant, a hydrogen recombination device 30 is provided for treating hydrogen generated when a severe accident occurs. At this time, the hydrogen recombination apparatus 30 is configured to be able to treat hydrogen even when sodium aerosol is generated due to leakage of sodium when a severe accident occurs.

  Specifically, the hydrogen recombination apparatus 30 will be described with reference to FIG. The hydrogen recombination device 30 is appropriately disposed inside the reactor containment vessel 11 or inside the building 20. The hydrogen recombination device 30 processes hydrogen generated inside the reactor containment vessel 11 or the building 20. The hydrogen recombination device 30 includes a housing 31, a catalyst part 32, an upstream filter member (upstream side covering part) 33, and a downstream filter member (downstream side covering part) 34.

  The casing 31 is formed in a box shape that is long in the vertical direction. In the casing 31, the atmosphere in the nuclear power plant 10 (in the reactor containment vessel 11 or the building 20) flows into the casing 31, and the atmosphere in the casing 31 flows out into the nuclear plant 10. The outlet 42 to be formed is formed. The inflow port 41 is formed on the lower side of the casing 31 in the vertical direction. The outlet 42 is formed on the upper side surface of the casing 31 in the vertical direction. For this reason, the atmosphere flows into the inside of the housing 31 from the inlet 41 of the housing 31, passes through the inside of the housing 31, and flows out from the outlet 42 of the housing 31. Therefore, an atmosphere channel 43 through which the atmosphere in the nuclear power plant 10 circulates is formed inside the casing 31, and the atmosphere channel 43 is formed along the vertical direction.

  The catalyst unit 32 is provided inside the housing 31 between the inflow port 41 and the outflow port 42, and allows the atmosphere to flow in the housing 31. The catalyst unit 32 adsorbs oxygen and hydrogen contained in the flowing atmosphere. The atmosphere in the casing 31 flows from the lower side in the vertical direction toward the upper side. For this reason, the hydrogen recombination apparatus 30 sucks the atmosphere in the nuclear power plant 10 from the inlet 41 of the casing 31 and causes the atmosphere containing water vapor to flow out of the inlet 41 of the casing 31.

  The catalyst unit 32 may be configured to generate the above-described catalytic reaction and allow the atmosphere to flow. For this reason, the catalyst unit 32 may have a configuration in which a plurality of catalyst plates, which are plates coated with a catalyst, are arranged, or may have a configuration in which particles coated with a catalyst are filled, and the surface area of the catalyst is a catalyst. There is no particular limitation as long as it has a surface area capable of generating a reaction.

  The upstream filter member 33 is provided inside the housing 31 between the inflow port 41 and the catalyst unit 32, and is disposed on the upstream side of the catalyst unit 32 in the atmosphere channel 43. The upstream filter member 33 is disposed adjacent to the catalyst unit 32 so as to cover a part of the lower surface of the catalyst unit 32. Further, the upstream filter member 33 is arranged close to the inner surface of the housing 31. The upstream filter member 33 is configured using, for example, a metal filter, and has a mesh that allows the sodium aerosol flowing from the inflow port 41 to enter the catalyst unit 32 while allowing the atmosphere to flow. For this reason, the upstream filter member 33 can suppress the penetration of sodium aerosol from the lower side of the catalyst portion 32 even when sodium aerosol flows from the inlet 41 together with the atmosphere.

  The downstream filter member 34 has the same configuration as that of the upstream filter member 33, and is provided inside the housing 31 between the outlet 42 and the catalyst unit 32, and the catalyst unit 32 is disposed in the atmosphere channel 43. It is arranged downstream. The downstream filter member 34 is disposed adjacent to the catalyst unit 32 so as to cover a part of the upper surface of the catalyst unit 32. At this time, the downstream filter member 34 is disposed to face the upstream filter member 33 in the vertical direction. Further, the downstream filter member 34 is arranged close to the inner surface of the housing 31. The downstream filter member 34 is configured by using, for example, a metal filter, and has a mesh that allows sodium atmosphere flowing from the outlet 42 to enter the catalyst unit 32 while allowing the atmosphere to flow. For this reason, the downstream filter member 34 can suppress the penetration of the sodium aerosol from the upper side of the catalyst portion 32 even when the sodium aerosol flows from the outlet 42 together with the atmosphere.

  In the hydrogen recombination apparatus 30 configured as described above, when an atmosphere containing hydrogen and sodium aerosol flows into the housing 31, the upstream filter member 33 and the downstream filter member 34 are connected to the catalyst part 32 of sodium aerosol. To prevent intrusion into a part of On the other hand, since the upstream filter member 33 and the downstream filter member 34 allow the atmosphere containing hydrogen to flow to a part of the catalyst part 32, a part of the catalyst part 32 contains hydrogen and hydrogen contained in the atmosphere. Oxygen generates an initial catalytic reaction. The heat generated by the initial catalytic reaction is transmitted to the catalyst portion 32 in a portion where the upstream filter member 33 and the downstream filter member 34 are not covered. For this reason, even if sodium aerosol adheres to the part of the catalyst part 32 that is not covered with the upstream filter member 33 and the downstream filter member 34, the entire catalyst part 32 is heated by the initial catalytic reaction. The sodium aerosol is melted or volatilized, and the catalyst part 32 is exposed.

  As described above, according to the first embodiment, a part of the upstream side and the downstream side of the catalyst unit 32 can be covered with the upstream filter member 33 and the downstream filter member 34. For this reason, the upstream filter member 33 and the downstream filter member 34 can suppress the adhesion of sodium aerosol to the catalyst part 32. Thereby, an initial catalytic reaction can be generated in a part of the catalyst portion 32 covered by the upstream filter member 33 and the downstream filter member 34. Therefore, even if sodium aerosol is generated, the hydrogen recombination device 30 can expose the catalyst part 32 and can suitably generate the catalytic reaction of the catalyst part 32. Can do.

  Further, according to the first embodiment, by using the upstream filter member 33 and the downstream filter member 34, the circulation of the atmosphere (gas) containing hydrogen, oxygen, and water vapor is allowed while suppressing the intrusion of sodium aerosol. be able to.

  Further, according to the first embodiment, even if sodium aerosol and hydrogen are generated inside the reactor containment vessel 11 or in the building 20, the hydrogen can be suitably processed using the hydrogen recombination device 30.

  In the first embodiment, the upstream filter member 33 and the downstream filter member 34 are provided so as to cover a part of the catalyst part 32, but may be provided so as to cover the entire surface of the catalyst part 32. In this case, the catalyst unit 32 contains oxygen that is contained in the atmosphere in the nuclear power plant 10 and causes hydrogen combustion before the upstream filter member 33 and the downstream filter member 34 are blocked by the adhesion of sodium aerosol. It is required to be processed.

  In the first embodiment, the upstream filter member 33 and the downstream filter member 34 are provided adjacent to the catalyst unit 32, but may be provided apart from the catalyst unit 32, and are not particularly limited. That is, the upstream filter member 33 may be provided in the atmosphere flow path 43 between the inflow port 41 and the catalyst unit 32, and the downstream filter member 34 is disposed between the outflow port 42 and the catalyst unit 32. What is necessary is just to provide in the atmosphere flow path 43. FIG.

  In the first embodiment, the upstream filter member 33 and the downstream filter member 34 are disposed. However, at least the upstream filter member 33 may be disposed, and the downstream filter member 34 may be omitted.

  In the first embodiment, the atmosphere flow path 43 is formed using the casing 31, but the atmosphere flow path 43 may be formed using a duct.

[Embodiment 2]
Next, the hydrogen recombination apparatus 50 according to the second embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional view schematically showing the hydrogen recombination apparatus according to the second embodiment. In the second embodiment, parts that are different from the first embodiment will be described in order to avoid redundant descriptions, and parts that are the same as those in the first embodiment will be described with the same reference numerals.

  The hydrogen recombination device 50 of the second embodiment is provided with a rotor 51 instead of the upstream filter member 33 and the downstream filter member 34 provided in the hydrogen recombination device 30 of the first embodiment.

  The rotor 51 is provided at the inlet 41 of the housing 31, has a plurality of blades 53, and is freely rotatable around a rotation shaft 55. The axial direction of the rotation shaft 55 of the rotor 51 is the flowing direction of the atmosphere flowing along the atmosphere flow path 43, that is, the vertical direction. The plurality of blades 53 are arranged around the rotation shaft 55 at a predetermined interval. For this reason, the atmosphere flowing in from the inlet 41 passes between the blades 53 and enters the housing 31. In addition, the plurality of blades 53 are arranged so as to overlap each other so as to block the inflow port 41 (that is, the atmosphere flow path 43) when viewed from the axial direction of the rotation shaft 55. For this reason, since the inlet 41 seen from the axial direction of the rotating shaft 55 is not formed with an opening communicating in the axial direction, sodium aerosol contained in the atmosphere easily collides with each blade 53.

  Further, since the rotor 51 is configured to be freely rotatable, when an updraft is generated by the heat of the catalytic reaction of the catalyst unit 32, the atmosphere flows from the upstream side to the downstream side of the atmosphere channel 43. By that, it rotates passively. The rotating rotor 51 removes the sodium aerosol attached to each blade 53 by centrifugal force or vibration caused by rotation. Here, a surrounding member 56 is provided around the rotor 51. For this reason, the sodium aerosol removed by centrifugal force adheres to the enclosure member 56 and falls through the enclosure member 56.

  As described above, according to the second embodiment, even when the aerosol enters from the downstream side of the atmosphere flow path 43 and adheres to the rotor 51, the aerosol can be dropped by the centrifugal force and rotational vibration of the rotating rotor 51. For this reason, it can suppress that aerosol adheres to the catalyst part 32.

  Further, according to the second embodiment, the sodium aerosol contained in the atmosphere flowing between the blades 53 is likely to collide with the plurality of blades 53, so that it is difficult for the sodium aerosol to pass through the rotor 51. For this reason, it can suppress that sodium aerosol adheres to the catalyst part 32. FIG.

  In addition, although the rotor 51 of Embodiment 2 was passively rotated by the rising airflow generated by the heat of the catalytic reaction, the rotor 51 may be rotated by power from a drive source (not shown).

  Further, a catalyst layer that becomes the same catalyst as the catalyst unit 32 may be formed on the surfaces of the plurality of blades 53 provided in the rotor 51 of the second embodiment. In this case, the catalyst layer causes the catalytic reaction to occur on the surfaces of the plurality of blades 53, so that the sodium aerosol is melted by the heat of the catalytic reaction and the sodium aerosol is dropped from the rotor 51.

  In addition, a coating film having water repellency may be formed on the surfaces of the plurality of blades 53 provided on the rotor 51 of the second embodiment. In this case, the coating film is dropped from the rotor 51 by repelling sodium aerosol attached to the plurality of blades 53.

[Embodiment 3]
Next, a hydrogen recombination device 60 according to Embodiment 3 will be described with reference to FIG. FIG. 4 is a cross-sectional view schematically showing the hydrogen recombination apparatus according to the third embodiment. In the third embodiment, parts that are different from the first and second embodiments will be described in order to avoid redundant descriptions, and parts that have the same configurations as those in the first and second embodiments will be described with the same reference numerals.

  In the hydrogen recombination device 60 of the third embodiment, a filter unit 61 with a cleaning function is provided instead of the upstream filter member 33 and the downstream filter member 34 provided in the hydrogen recombination device 30 of the first embodiment.

  The filter unit 61 with a cleaning function is connected to the inlet 41 of the housing 31 and includes a unit case 65, a plurality of filter members 66, an endless track (moving unit) 67, and a cleaning pool 68. doing.

  The unit case 65 is formed in a box shape, a gas inlet 71 through which the atmosphere in the nuclear power plant 10 flows into the unit case 65, and a gas outlet 72 through which the atmosphere in the unit case 65 flows into the housing 31. Is formed. The gas inflow port 71 is formed on the lower side of the unit case 65 in the vertical direction, and is formed close to one side in the horizontal direction. The gas outlet 72 is formed on the upper side of the unit case 65 in the vertical direction, and is formed close to one side in the horizontal direction. The gas outlet 72 is formed at a position facing the gas inlet 71 in the vertical direction. The gas outlet 72 is connected to the inlet 41 of the housing 31. For this reason, the atmosphere flows into the inside of the unit case 65 from the gas inlet 71 of the unit case 65, passes through the inside of the unit case 65, and flows out of the gas outlet 72 of the unit case 65. The atmosphere that flows out from the unit case 65 flows into the inlet 41 of the casing 31, passes through the inside of the casing 31 (catalyst portion 32), and flows out of the outlet 42 of the casing 31. Therefore, the atmosphere channel 43 is formed along the vertical direction inside the unit case 65 and the housing 31.

  The endless track portion 67 includes a pair of pulleys 75 and a belt member 76. The pair of pulleys 75 are arranged in the horizontal direction, and each pulley 75 can freely rotate. The belt member 76 has a predetermined width in the axial direction of each pulley 75, is formed in an annular shape, and is stretched over a pair of pulleys 75. For this reason, the belt member 76 circulates around the pair of pulleys 75. The endless track portion 67 is disposed adjacent to the atmosphere channel 43 formed inside the unit case 65.

  The plurality of filter members 66 are attached to the belt member 76 of the endless track portion 67 side by side at a predetermined interval. Each filter member 66 is attached so as to protrude with respect to the peripheral surface of the belt member 76. The filter member 66 is configured using a metal filter, similarly to the upstream filter member 33 and the downstream filter member 34 of the first embodiment. The filter member 66 rotates around the belt member 76 of the endless track portion 67, so that the plurality of filter members 66 move around. At this time, the plurality of filter members 66 are moved by the endless track portion 67 so that at least one filter member 66 blocks the atmosphere flow path 43 inside the unit case 65. And the position which obstruct | occludes the atmosphere flow path 43 is a removal position which removes sodium aerosol. Therefore, each filter member 66 is sequentially positioned at the removal position by the movement of the endless track portion 67.

  The cleaning pool 68 is for cleaning the filter member 66 to which the sodium aerosol is adhered. The cleaning pool 68 stores cleaning liquid therein. As the cleaning liquid, for example, an alcohol solvent is used. The cleaning pool 68 is disposed on the lower side of the endless track portion 67, and a plurality of filter members 66 that circulate on the lower side of the endless track portion 67 are disposed in the cleaning liquid.

  In the hydrogen recombination device 60 configured as described above, an atmosphere containing hydrogen and sodium aerosol flows into the unit case 65. Then, the sodium aerosol in the atmosphere adheres to the filter member 66 located at the removal position, whereby the atmosphere from which the sodium aerosol has been removed passes through the inside of the unit case 65 and flows into the housing 31. And the catalyst part 32 in the housing | casing 31 processes hydrogen, when a catalytic reaction generate | occur | produces with hydrogen and oxygen contained in atmosphere. Here, when the amount of sodium aerosol attached to the filter member 66 at the removal position increases, the endless track portion 67 moves the filter member 66 attached with sodium aerosol downward due to the weight of the sodium aerosol, A new filter member 66 is moved to the removal position. The filter member 66 that has moved downward is cleaned at a cleaning position immersed in the cleaning liquid in the cleaning pool 68. And the endless track part 67 can move the several filter member 66 to a removal position and a washing | cleaning position sequentially by moving the filter member 66 to which sodium aerosol adhered in the removal position sequentially below. it can. As described above, the endless track portion 67 can passively move the plurality of filter members 66 by the dead weight of the attached sodium aerosol.

  As described above, according to the third embodiment, the filter member 66 to which the sodium aerosol is adhered can be moved to the cleaning position by the endless track portion 67, and the filter member 66 can be cleaned. The member 66 can be moved to the removal position to remove the sodium aerosol.

  Further, according to the third embodiment, the filter member 66 can be easily cleaned by immersing it in the cleaning pool 68.

  Further, according to the third embodiment, the endless track portion 67 can move the plurality of filter members 66 sequentially to the removal position and the cleaning position by rotating the belt member 76 between the pair of pulleys 75. it can.

  In addition, according to the third embodiment, the endless track portion 67 can passively move the filter member 66 by the dead weight of sodium aerosol attached to the filter member 66. For this reason, since the endless track portion 67 does not require power from the drive source, the filter member 66 can be moved between the removal position and the cleaning position even in a situation where it is difficult to secure power. Can do.

  In addition, although the endless track part 67 of Embodiment 3 was set as the structure which moves the filter member 66 passively with the dead weight of aerosol, the structure moved with the motive power from the drive source which is not shown in figure may be sufficient. In this case, the endless track portion 67 can reliably move the filter member 66 by the power from the drive source.

[Embodiment 4]
Next, a hydrogen recombination device 80 according to Embodiment 4 will be described with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view schematically showing the hydrogen recombination apparatus according to the fourth embodiment. 6 is a cross-sectional view taken along the line AA in FIG. In the fourth embodiment, parts that are different from those in the first to third embodiments will be described in order to avoid duplicate descriptions, and parts that have the same configuration as those in the first to third embodiments will be described with the same reference numerals.

  In the hydrogen recombination device 80 of the fourth embodiment, a filter unit 81 with a cleaning function is provided instead of the upstream filter member 33 and the downstream filter member 34 provided in the hydrogen recombination device 30 of the first embodiment.

  The cleaning function-equipped filter unit 81 is connected to the inlet 41 of the housing 31 and includes a unit case 85, a filter member 86, a pair of pulleys 87, and a cleaning pool 88.

  The unit case 85 is formed in a box shape, and includes a gas inlet 91 through which the atmosphere in the nuclear power plant 10 flows into the unit case 85, and a gas outlet 92 through which the atmosphere in the unit case 85 flows into the housing 31. Is formed. The gas inlet 91 is formed on the side surface of the unit case 85 and is formed in the center in the vertical direction of the unit case 85. The gas outlet 92 is formed on the side surface of the unit case 85 and is formed at the center in the vertical direction of the unit case 85. At this time, as shown in FIG. 6, the opening surface of the gas outlet 92 is formed to be orthogonal to the opening surface of the gas inlet 91. One end side of the connection pipe 89 is connected to the gas outlet 92, and the other end side of the connection pipe 89 is connected to the inlet 41 of the housing 31. For this reason, the atmosphere flows into the inside of the unit case 85 from the gas inlet 91 of the unit case 85, passes through the inside of the unit case 85, and flows out of the gas outlet 92 of the unit case 85. The atmosphere flowing out from the unit case 85 flows into the inlet 41 of the casing 31, passes through the inside of the casing 31 (catalyst unit 32), and flows out from the outlet 42 of the casing 31. Therefore, the atmosphere flow path 43 is formed from the gas inlet 91 toward the gas outlet 92 inside the unit case 85 and is formed along the vertical direction inside the housing 31.

  The pair of pulleys 87 are arranged side by side in the vertical direction, and each pulley 87 can freely rotate. Further, each pulley 87 is arranged so that the rotation axis thereof is orthogonal to the opening surface of the gas outlet 92, and a pair of pulleys 87 are located on both sides of the gas outlet 92 in the vertical direction. It is done.

  The filter member 86 has a width that is the same as the length of each pulley 87 in the axial direction, is formed in an annular shape, and is spanned between a pair of pulleys 87. For this reason, the gas outlet 92 is located inside the annular filter member 86. Moreover, the filter member 86 is configured using a metal filter, similarly to the upstream filter member 33 and the downstream filter member 34 of the first embodiment. The filter member 86 circulates around the pair of pulleys 87. The filter member 86 is disposed so that the peripheral surface thereof faces the opening surface of the gas inlet 91. Therefore, a part of the filter member 86 facing the gas inlet 91 is disposed so as to block the atmosphere flow path 43 inside the unit case 85. And the position which obstruct | occludes the atmosphere flow path 43 is a removal position which removes sodium aerosol.

  As in the third embodiment, the cleaning pool 88 is for cleaning the filter member 86 to which the sodium aerosol is adhered. The cleaning pool 88 stores cleaning liquid therein, and is disposed so that a part of the lower side of the filter member 86 is submerged in the cleaning liquid.

  In addition, inside the unit case 85, an outer closing plate 94 disposed outside the annular filter member 86 and an inner closing plate 95 disposed inside the annular filter member 86 are provided. The outer closing plate 94 is provided on the upper side of the filter member 86 and is provided so as to close the space between the outer peripheral surface of the filter member 86 and the inner peripheral surface of the unit case 85. For this reason, the outer closing plate 94 prevents the atmosphere flowing into the unit case 85 from the gas inlet 91 from flowing into the opposite side of the gas inlet 91 across the filter member 86. The inner closing plate 95 is provided between the pair of pulleys 87 and is provided along a part of the filter member 86 on the opposite side of the gas inlet 91 with the gas outlet 92 interposed therebetween. For this reason, the inner closing plate 95 prevents the atmosphere that has passed through the filter member 86 from passing through the filter member 86 again and flowing out to the outside of the filter member 86.

  In the hydrogen recombination device 80 configured as described above, an atmosphere containing hydrogen and sodium aerosol flows into the unit case 85. Then, the sodium aerosol in the atmosphere adheres to a part of the filter member 86 located at the removal position, and thereby the atmosphere from which the sodium aerosol has been removed passes through the inside of the filter member 86 and the gas outlet 92. Spill from. The atmosphere flowing out from the gas outlet 92 flows through the connecting pipe 89 and flows into the housing 31. And the catalyst part 32 in the housing | casing 31 processes hydrogen, when a catalytic reaction generate | occur | produces with hydrogen and oxygen contained in atmosphere. Here, when the amount of sodium aerosol adhering to a part of the filter member 86 at the removal position increases, the pair of pulleys 87 lowers a part of the filter member 86 to which the sodium aerosol adheres due to the weight of the sodium aerosol. Move to the side. Accordingly, the filter member 86 moves around the pair of pulleys 87 to move a part of the filter member 86 to which the sodium aerosol is not attached to the removal position. A part of the filter member 86 to which the sodium aerosol is attached is cleaned at a cleaning position where the cleaning liquid in the cleaning pool 88 is immersed. And a pair of pulley 87 moves the filter member 86 to a removal position and a washing | cleaning position continuously by moving a part of filter member 86 to which sodium aerosol adhered in the removal position to the downward side sequentially. be able to. Thus, the pair of pulleys 87 can passively move the filter member 86 around by the dead weight of the attached sodium aerosol.

  As described above, according to the fourth embodiment, since the filter member 86 can be rotated between the pair of pulleys 87, the filter member 86 can be continuously moved to the removal position and the cleaning position.

  In addition, although the pair of pulleys 87 according to the fourth embodiment are configured to passively move the filter member 86 by its own weight, it may be configured to move by power from a driving source (not shown). In this case, the pair of pulleys 87 can reliably move the filter member 86 by power from the drive source.

[Embodiment 5]
Next, the hydrogen recombination apparatus 100 according to the fifth embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view schematically showing the hydrogen recombination apparatus according to the fifth embodiment. In the fifth embodiment, in order to avoid redundant description, portions different from the first to fourth embodiments will be described, and portions having the same configurations as those of the first to fourth embodiments will be described with the same reference numerals.

  In the hydrogen recombination device 100 of the fifth embodiment, a filter unit 101 is provided instead of the upstream filter member 33 and the downstream filter member 34 provided in the hydrogen recombination device 30 of the first embodiment.

  The filter unit 101 is provided at the inlet 41 of the housing 31 and includes a plurality of filter members 105 and a filter peeling mechanism 106.

  The plurality of filter members 105 are stacked in the thickness direction, and each filter member 105 is configured using a metal filter, similarly to the upstream filter member 33 and the downstream filter member 34 of the first embodiment. ing. The filter member 105 is provided so as to cover the entire surface of the inflow port 41 of the housing 31.

  The filter peeling mechanism 106 holds each filter member 105 to which sodium aerosol is not attached so as to be in a laminated state. On the other hand, the filter peeling mechanism 106 is configured so that the filter member 105 to which the sodium aerosol is adhered is centered on one end portion of the filter member 105 and the other end portion of the filter member 105 is developed downward in the vertical direction. 105 is peeled off.

  As described above, according to the fifth embodiment, the new filter member 105 can be exposed by peeling off the filter member 105 to which the sodium aerosol is adhered. For this reason, it can suppress that sodium aerosol adheres to the catalyst part 32. FIG.

  The first to fifth embodiments may be appropriately combined. For example, the upstream filter member 33 and the downstream filter member 34 of the first embodiment may be combined with the hydrogen recombination devices 50, 60, 80, and second embodiments of the second to fifth embodiments. 100 may be applied.

DESCRIPTION OF SYMBOLS 10 Nuclear power plant 11 Reactor containment vessel 12 Fast breeder reactor 20 Building 23 Steam turbine 24 Generator 25 Condenser 30 Hydrogen recombination device 31 Case 32 Catalyst part 33 Upstream filter member 34 Downstream filter member 41 Inlet 42 Flow Outlet 43 Atmospheric flow path 50 Hydrogen recombination apparatus (Embodiment 2)
51 Rotor 53 Blade 55 Rotating shaft 56 Enclosure member 60 Hydrogen recombination device (Embodiment 3)
61 Filter Unit with Cleaning Function 65 Unit Case 66 Filter Member 67 Endless Track 68 Cleaning Pool 71 Gas Inlet 72 Gas Outlet 75 Pulley 76 Belt Member 80 Hydrogen Recombining Device (Embodiment 4)
81 Filter unit with cleaning function 85 Unit case 86 Filter member 87 Pulley 88 Cleaning pool 89 Connection pipe 91 Gas inlet 92 Gas outlet 100 Hydrogen recombination apparatus (Embodiment 5)
101 Filter unit 105 Filter member 106 Filter peeling mechanism

Claims (16)

In a hydrogen recombination system installed in a nuclear power plant where liquid metal is used as a coolant,
An atmosphere flow path through which the atmosphere in the nuclear power plant circulates;
A catalyst unit that is provided in the atmosphere flow path and generates water vapor by combining hydrogen and oxygen contained in the atmosphere by a catalytic reaction;
A hydrogen recombination comprising: an upstream covering portion provided in the atmosphere flow path upstream of the catalyst portion in the direction of circulation of the atmosphere and provided to cover at least a part of the catalyst portion; apparatus.   2. The apparatus according to claim 1, further comprising a downstream covering portion provided in the atmosphere flow path on the downstream side of the catalyst portion in the circulation direction of the atmosphere, and provided to cover at least a part of the catalyst portion. The hydrogen recombination apparatus according to 1.   The hydrogen recombination apparatus according to claim 2, wherein the upstream covering portion and the downstream covering portion are filter members.   The hydrogen recombination apparatus according to claim 1, wherein the upstream side covering portion is a rotor having a plurality of blades and rotating about a rotation axis. The rotating shaft is provided with its axial direction along the circulation direction of the atmosphere,
5. The hydrogen recombination apparatus according to claim 4, wherein the plurality of blades are arranged to overlap each other so as to block the atmosphere flow path when viewed from the axial direction of the rotation shaft.   6. The catalyst layer according to claim 5, wherein each of the plurality of blades has a catalyst layer that generates water vapor by combining hydrogen and oxygen contained in the atmosphere by a catalytic reaction at least on a surface thereof. Hydrogen recombination equipment.   6. The hydrogen recombination apparatus according to claim 5, wherein a coating film having water repellency is formed on the surface of each of the plurality of blades. The upstream covering portion is a filter unit with a cleaning function,
The filter unit with a cleaning function is:
A filter member disposed at a removal position for removing the aerosol contained in the atmosphere;
A cleaning section for cleaning the filter member at a cleaning position;
The hydrogen recombination apparatus according to claim 1, further comprising a moving unit that moves the filter member between the removal position and the cleaning position. The cleaning unit is a cleaning pool in which cleaning liquid is stored,
The hydrogen recombination apparatus according to claim 8, wherein the moving unit moves the filter member to the cleaning position immersed in the cleaning liquid of the cleaning pool. The moving part includes a pair of pulleys and an annular belt member spanned between the pair of pulleys,
The hydrogen recombination apparatus according to claim 8 or 9, wherein a plurality of the filter members are attached to the belt member. The moving part includes a pair of pulleys,
10. The hydrogen recombination apparatus according to claim 8, wherein the filter member is formed on an annular belt that spans the pair of pulleys.   12. The hydrogen recombination apparatus according to claim 8, wherein the moving unit moves the filter member by the weight of the aerosol attached to the filter member.   The hydrogen recombination apparatus according to claim 8, wherein the moving unit moves the filter member by power from a driving source. The upstream covering portion is a filter unit,
The filter unit is
A plurality of filter members stacked in the thickness direction;
3. The hydrogen recombination apparatus according to claim 1, further comprising: a filter peeling mechanism that peels off the filter member to which the aerosol is attached, and exposes the new filter member. 4. A reactor vessel in which liquid metal is used as the primary coolant;
A reactor containment vessel for housing the reactor vessel therein;
A nuclear power plant comprising: the hydrogen recombination device according to claim 1, which is provided inside the nuclear reactor containment vessel. A reactor vessel in which liquid metal is used as the primary coolant;
A reactor containment vessel for housing the reactor vessel therein;
A secondary system in which a liquid metal is used as a secondary coolant to be heat exchanged with the primary coolant;
A building that houses the secondary system inside;
A nuclear power plant comprising: the hydrogen recombination device according to claim 1, which is provided inside the building.

Images