JP2013178188A - Hydrogen treatment equipment of nuclear power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hydrogen treatment equipment of a nuclear power plant, allowed to be downsized and capable of improving hydrogen treatment capacity.SOLUTION: Hydrogen treatment equipment 1 has an annular catalyst layer 2 and surrounds a periphery of the catalyst layer 2 by a heat insulating layer 3. A gas passage 4 is formed on the inside of the catalyst layer 2. The hydrogen treatment equipment 1 is installed, for example, in a dry well filled with nitrogen gas in a reactor container. In accident of loss of a coolant, nitrogen gas containing hydrogen and oxygen discharged from cracks generated in a pipeline connected to the reactor container into the dry well is made flow into the gas passage 4. The hydrogen contained in the nitrogen gas generates water by reacting with the oxygen in the nitrogen gas by action of a catalyst metal of the catalyst layer 2. Since the gas passage 4 is surrounded by the annular catalyst layer 2, thermal dose from the catalyst layer 2 to the nitrogen gas in the gas passage 4 is increased, and further heat quantity discharged from the catalyst layer 2 to the outside is reduced due to the formation of the heat insulating layer 3.

Description

  The present invention relates to a hydrogen treatment facility for a nuclear power plant, and more particularly to a hydrogen treatment facility for a nuclear power plant suitable for being placed in a reactor building of a boiling water nuclear power plant.

  In a loss-of-coolant accident, which is considered as a design standard event in the safety design of a nuclear reactor, high-temperature and high-pressure cooling water in the reactor pressure vessel causes high-temperature steam from breakage points such as piping connected to the reactor pressure vessel. And released into the reactor containment vessel. The temperature of the fuel rod of the fuel assembly loaded in the reactor core in the reactor pressure vessel rises, and the zirconium and water in the cladding of the fuel rod react to generate hydrogen gas. This hydrogen is released into the reactor containment vessel along with steam from the pipe breakage point. In addition, it is assumed that radioactive materials released into the reactor containment from the pipe breakage point flow into the pressure suppression pool, and hydrogen gas and oxygen gas are generated by radiolysis of water.

  As a countermeasure against such an event, in a boiling water nuclear power plant that employs a reactor containment vessel having a pressure suppression chamber, the atmosphere in the reactor containment vessel is replaced with nitrogen gas during operation. Furthermore, in the event of a loss of coolant accident, a heated hydrogen treatment facility connected to the reactor containment vessel by piping is installed. When a coolant loss accident occurs, the blower is driven to supply gas containing hydrogen and oxygen in the reactor containment vessel to the heated hydrogen treatment facility, and hydrogen and oxygen are heated by the electric heater of the heated hydrogen treatment facility. It is recombined and converted to water vapor.

  On the other hand, in recent years, catalytic-type hydrogen treatment facilities that have excellent passive safety and do not require external power have been developed. An example of this catalytic hydrogen treatment facility is described in JP-A-10-227885. Catalytic hydrogen treatment equipment has a catalyst that reacts hydrogen and oxygen, and a chimney that houses the catalyst, and is placed in a dry well and a pressure suppression chamber in the reactor containment vessel where the reactor pressure vessel is placed. The The height from the upper end of the catalyst layer to the chimney outlet is at least twice the height of the catalyst layer, and the channel area of the chimney outlet is 25% or more of the channel area of the chimney inlet.

  In the reactor containment vessel, gas existing around the catalytic hydrogen treatment facility including hydrogen and oxygen flows from the chimney inlet to the catalyst layer in the chimney. Hydrogen and oxygen undergo a chemical reaction on the catalyst surface and recombine into water. This chemical reaction is an exothermic reaction, and the gas in the catalyst layer is warmed by the heat generation, and an upward flow is generated in the catalyst layer. The warmed gas flows out of the catalyst layer and is discharged out of the catalytic hydrogen treatment facility from the chimney outlet. As a result, the pressure in the chimney becomes negative, and a new gas flows from the chimney inlet at the lower end into the catalyst layer in the chimney, where hydrogen and oxygen react. When these processes are repeated and the gas existing around the catalytic hydroprocessing equipment contains hydrogen and oxygen, the catalytic hydroprocessing equipment forms a circulating flow while treating the hydrogen with the catalyst and is contained in the gas. The hydrogen to be treated is continuously treated.

  Japanese Patent Application Laid-Open No. 2009-69122 discloses an example in which a catalytic hydrogen treatment facility is disposed outside a reactor containment vessel inside a reactor building.

Japanese Patent Laid-Open No. 10-227885 JP 2009-69122 A

  Hydrogen released at the time of the coolant loss accident is treated even in the situation where the power source is lost by the catalytic hydrogen treatment facility. However, when some of the gas containing hydrogen flows into the reactor building or the like, there is a possibility that those gases partially stay. For such an event, it is effective to install a catalytic hydrogen treatment facility in each room and space in the reactor building where gas may stay (JP 2009-69122 A). reference).

  However, there are cases where a space where the catalytic hydrogen treatment facility can be installed cannot be secured in those rooms and spaces, and it is necessary to make the catalytic hydrogen treatment facility smaller than before. However, catalytic hydroprocessing equipment needs to warm the gas by the heat generated by the hydrogen recombination reaction and generate an upward flow, and simply downsizing can reduce the spatial heat generation density and other than gas. There is a concern that the necessary amount of heat generation cannot be ensured due to heat escape to the heat source.

  Inventors examined the countermeasure which can suppress the fall of the hydrogen treatment performance at the time of size reduction of a catalytic type hydrogen treatment facility. As a result, it has been found that in a catalytic hydrogen treatment facility, the contact area between the catalyst and the gas flow can be maximized, and heat escape to the surroundings can be minimized, thereby improving the hydrogen treatment performance during downsizing.

  An object of the present invention is to provide a hydrogen treatment facility for a nuclear power plant that can be reduced in size and improved in hydrogen treatment performance.

  A feature of the present invention that achieves the above-described object resides in having an annular catalyst layer and a gas flow path formed inside the annular catalyst layer.

  The above object can also be achieved by providing a catalyst layer that forms a gas flow path and a heat insulating layer that surrounds the catalyst layer.

  ADVANTAGE OF THE INVENTION According to this invention, a hydrogen treatment facility can be reduced in size and the hydrogen treatment performance in the hydrogen treatment facility can be improved.

It is a block diagram of the hydrogen treatment equipment of the nuclear power plant of Example 1 which is one suitable Example of this invention. It is explanatory drawing which shows the process of the hydrogen recombination in the hydrogen treatment equipment shown in FIG. It is a characteristic view which shows the relationship between the heat insulating material thickness in the hydrogen treatment equipment shown in FIG. 1, a catalyst layer thickness, and a hydrogen treatment speed. It is a block diagram of the hydrogen treatment equipment of the nuclear power plant of Example 2 which is another Example of this invention. It is a block diagram of the hydrogen treatment equipment of the nuclear power plant of Example 3 which is another Example of this invention. It is a block diagram of the hydrogen treatment equipment of the nuclear power plant of Example 4 which is another Example of this invention.

  Inventors examined the countermeasure which can suppress the fall of the hydrogen-treatment performance of a catalyst-type hydrogen treatment facility, when reducing the size of a catalyst-type hydrogen treatment facility. As a result, it has been found that the decrease in the hydrogen treatment performance is mainly due to the heat generated in the catalyst layer of the catalytic hydrogen treatment facility being released to the outside of the catalyst layer. Therefore, the inventors made the gas flowing in the gas flow path by making the catalyst layer cylindrical and making the central region surrounded by the catalyst layer a gas flow path in which a gas containing hydrogen flows. It has been found that the temperature can be efficiently raised by the heat generated in the surrounding catalyst layer to form an upward flow in the gas flow path.

  Further, the inventors have found that in order to further suppress the release of heat from the catalyst layer to the outside, it is preferable to surround the catalyst layer with a heat insulating layer.

  Furthermore, in order to cope with the case where heat generation necessary for the recombination reaction between hydrogen and oxygen cannot be secured, such as when the concentration of hydrogen contained in the gas flowing into the gas flow path surrounded by the catalyst layer is low, a hydrogen sensor The inventors have also found that it is necessary to install a fan driven by a battery and a battery. Thereby, even when the hydrogen concentration is low, the hydrogen treatment can be performed more reliably.

  Examples of the present invention reflecting the above examination results will be described below.

  A hydrogen treatment facility for a nuclear power plant according to embodiment 1, which is a preferred embodiment of the present invention, will be described with reference to FIG.

  The hydrogen treatment facility 1 of the nuclear power plant according to the present embodiment is a catalytic hydrogen treatment facility, and includes an annular catalyst layer 2 and a heat insulating layer 3. The catalyst layer 2 is disposed in a cylindrical container (not shown). A gas flow path 4 is formed inside the cylindrical catalyst layer 2 and is surrounded by the catalyst layer 2. A heat insulating layer 3 surrounds the outer surface of the container in which the catalyst layer 2 is disposed.

  The catalyst filled in the catalyst layer 2 has a granular shape, and an inorganic oxide (for example, alumina oxide) is supported on the surface of the porous metal carrier, and the supported inorganic oxide (for example, alumina oxide) is supported. It is a metal catalyst constituted by adding platinum as a catalyst metal to the surface. Instead of the metal catalyst, an inorganic oxide catalyst constituted by attaching a metal catalyst (for example, platinum) to the surface of a porous inorganic oxide (for example, porous alumina oxide) support may be used. As the catalyst metal, palladium may be used instead of platinum.

  Glass wool is used in this embodiment as a heat insulating material constituting the heat insulating layer 3. In addition to glass wool, fiber-based heat insulating materials such as rock wool and cellulose fiber, or foam-based heat insulating materials may be used. Glass wool is a type of fiber insulation.

  The hydrogen treatment facility 1 of the present embodiment is disposed, for example, in a reactor containment vessel of a boiling water nuclear plant. Moreover, you may install the hydrogen treatment equipment 1 in the outer area | region of a reactor containment vessel in the reactor building where a reactor containment vessel is installed.

  A reactor pressure vessel in which a core loaded with a plurality of fuel assemblies is disposed is disposed in the reactor containment vessel. The main steam pipe connected to the reactor pressure vessel extends through the reactor containment vessel to the turbine building located adjacent to the reactor building, and is connected to the turbine installed in the turbine building. . Isolation valves are provided in the main steam pipe in and out of the reactor containment near the penetration of the main containment in the main containment. During operation of the boiling water nuclear power plant, the reactor containment vessel is in a nitrogen gas atmosphere.

  The function of the hydrogen treatment facility 1 will be described by taking as an example a case where a crack penetrating the main steam pipe occurs in the reactor containment vessel and a coolant loss accident occurs. When a coolant loss accident occurs, each isolation valve provided in the main steam pipe is fully closed.

  Due to the occurrence of the coolant loss accident, the high-temperature and high-pressure cooling water in the reactor pressure vessel is released as high-temperature steam to the dry well in the reactor containment vessel through a crack generated in the main steam pipe. Hydrogen gas and oxygen gas generated in the reactor pressure vessel together with this steam are released into the dry well. Nitrogen gas in the dry well containing hydrogen, oxygen, and steam flows into the hydrogen treatment facility 1 disposed in the dry well. Specifically, this nitrogen gas containing hydrogen and the like flows into the gas flow path 4 surrounded by the catalyst layer 2 from the gas inlet, and a part of this nitrogen gas rises in the catalyst layer 2. To do. The gas inlet is formed at the lower end of the gas channel 4, and the gas outlet is formed at the upper end of the gas channel 3.

  While the nitrogen gas containing hydrogen and oxygen is rising in the catalyst layer 2 and the gas flow path 4, the hydrogen contained in the nitrogen gas is converted into the nitrogen gas by the action of platinum which is a catalyst metal present in the catalyst layer 2. Reacts with oxygen contained in water to become water. The recombination reaction between hydrogen and oxygen by the action of the catalytic metal is an exothermic reaction (see S1 in FIG. 2). Due to the heat generated by the recombination reaction, the nitrogen gas flowing into the gas flow path 4 is heated and the temperature rises, so that an upward flow of nitrogen gas is formed in the gas flow path 4 (see S2 in FIG. 2). ). Hydrogen contained in the nitrogen gas flowing into the gas flow path 4 is recombined with oxygen by the action of the catalytic metal to become water. For this reason, the hydrogen concentration of the nitrogen gas flowing out from the gas inlet of the gas flow path 4 to the dry well is lower than the hydrogen concentration of the nitrogen gas flowing into the gas flow path 4 from the gas inlet.

  Since an upward flow is formed in the gas flow path 4, new nitrogen gas containing hydrogen in the dry well flows into the gas flow path 4 from the gas inlet (see S3 in FIG. 2). While the nitrogen gas in the dry well contains hydrogen and oxygen, the nitrogen gas continuously flows into the gas flow path 4. Due to the hydrogen treatment by the hydrogen treatment facility 1, the hydrogen concentration in the reactor containment vessel is significantly reduced.

  In the present embodiment, since the annular catalyst layer 2 surrounds the gas flow path 4, the heating amount from the catalyst layer 2 to the nitrogen gas in the gas flow path 4 is described in JP-A-10-227885. It becomes larger than the heating amount from the catalyst to the nitrogen gas in the catalytic hydrogen treatment facility. That is, in the rectangular flat type catalyst cartridge used in the catalytic hydrogen treatment facility described in Japanese Patent Laid-Open No. 10-227885, the temperature rise is small because heat is generated uniformly in a wide area. On the other hand, when the annular catalyst layer 2 is used as in this embodiment, when nitrogen gas containing hydrogen and oxygen flows into the gas channel 4 surrounded by the catalyst layer 2, the gas channel 4 Heat is generated intensively, and heat is easily trapped in the gas flow path 4 surrounded by the annular spot sale 2, so that the temperature is higher than that of the catalytic hydrogen treatment facility described in Japanese Patent Laid-Open No. 10-227885. To do. For this reason, the temperature of the nitrogen gas rising in the gas flow path 4 becomes high, and the hydrogen treatment efficiency in this example is the hydrogen treatment efficiency in the catalytic hydrotreating facility described in Japanese Patent Application Laid-Open No. 10-227885. More than.

  Further, in the hydrogen treatment facility 1 of the present embodiment, the rate of upward flow of nitrogen gas in the gas flow path 4 increases due to an increase in the amount of heating to the nitrogen gas. The flow rate of inflowing nitrogen gas increases. The hydrogen treatment facility 1 of this embodiment does not require a chimney and is downsized.

  Since the periphery of the catalyst layer 2 is surrounded by the heat insulating layer 3, in this embodiment, the catalyst layer 2 is kept warm by the heat insulating layer 3, and the release of heat from the outer surface of the catalyst layer 2 to the outside is suppressed. As a result, of the amount of heat generated by the recombination reaction between hydrogen and oxygen, the proportion of the amount of heat used for heating the nitrogen gas in the gas flow path 4 increases, and the recombination reaction between hydrogen and oxygen is further promoted. That is, the hydrogen treatment efficiency in the hydrogen treatment facility 1 is further improved.

  FIG. 3 shows an example of the result of relatively evaluating the relationship between the ratio of the radial thickness of the heat insulating layer 3 to the radial thickness of the catalyst layer 2 and the hydrogen treatment speed in the hydrogen treatment facility 1 of this example. Show. The hydrogen treatment speed when the thickness of the heat insulating layer 3 is normalized by the thickness of the catalyst layer 2 increases with an increase in the ratio of the thickness of the heat insulating layer 3 to the thickness of the catalyst layer 2. However, when the ratio exceeds a certain value, the rate of increase in the hydrogen treatment rate is saturated.

  As described above, the hydrogen treatment facility 1 of this embodiment can be downsized and improve the hydrogen treatment performance. The downsized hydrogen treatment facility 1 of the present embodiment can be installed in a narrow space in the reactor containment vessel and a narrow room and a narrow space in the reactor building where gas may stay.

  A plurality of annular catalyst layers 2 having different outer diameters are arranged concentrically, and a gas flow path into which nitrogen gas containing hydrogen flows is formed between the innermost catalyst layer 2 and between the catalyst layers 2. However, the outer surface of the annular catalyst layer 2 located on the outermost side may be surrounded by the heat insulating material layer 3 to constitute a hydrogen treatment facility. Such a hydrogen treatment facility can also obtain each effect produced in the hydrogen treatment facility 1. By arranging the plurality of annular catalyst layers 2 concentrically, the heat released outward from the catalyst layer 2 located on the inner side of the catalyst layer 2 located on the outermost side is the outer surface of the catalyst layer 2. It is used for heating the nitrogen gas that rises in the gas flow path in contact with the gas.

  A hydrogen treatment facility for a nuclear power plant according to embodiment 2, which is another embodiment of the present invention, will be described with reference to FIG. The hydrogen treatment facility 1A of the nuclear power plant of the present embodiment is a catalytic hydrogen treatment facility.

  The hydrogen treatment facility 1A has a configuration in which a fan (blower) 5, a battery 6, and a temperature sensor 7 are added to the hydrogen treatment facility 1 of the first embodiment. The other configuration of the hydrogen treatment facility 1A is the same as that of the hydrogen treatment facility 1.

  A fan 5 is disposed directly above the gas outlet of the gas flow path 4. A motor (not shown) of the fan 5 is connected to the battery 6 by the cable 8, and the temperature sensor 7 is also connected to the battery 6. Although not shown, the fan 5 and the sensor 7 are also connected to a local power source or an external power source. The temperature sensor 7 is installed in the dry well and measures the temperature in the dry well. The temperature sensor 7 is a sensor for detecting a loss of coolant accident. Instead of the temperature sensor 7, a hydrogen sensor for detecting the hydrogen concentration in the dry well or a pressure sensor for detecting the pressure in the dry well is replaced with the loss of coolant. It may be used as a sensor for detecting an accident and installed in a dry well.

  If the in-house power supply or the external power supply is normal when the coolant loss accident occurs, the fan 5 and the temperature sensor 7 operate with a current supplied from the in-house power supply or the external power supply. The temperature in the dry well measured by the temperature sensor 7 is input to a control device (not shown). The control device determines whether the input measured temperature is equal to or higher than a set temperature indicating the occurrence of a coolant loss accident. When a coolant loss accident occurs, as described above, high-temperature steam is released from a crack generated in the pipe into the dry well, and thus the temperature in the dry well rises rapidly. By measuring the temperature in the dry well, it is possible to grasp the occurrence of the coolant loss accident. When the control device determines that the temperature measured by the temperature sensor 7 is equal to or higher than the set temperature, a switch (not shown) provided in a power cable connecting the fan 5 to the in-house power source or the external power source. ) Is closed. Since current is supplied to the motor of the fan 5 through the power cable, the fan 5 rotates.

  When a coolant loss accident occurs, in the hydrogen treatment facility 1A, as in the first embodiment, nitrogen gas containing hydrogen flows into the gas flow path 4 and the action of the metal catalyst (for example, platinum) of the catalyst layer 2 Thus, a recombination reaction between hydrogen and oxygen contained in the flowing nitrogen gas occurs. Since the fan 5 is rotated in such a state, the flow rate of nitrogen gas flowing in the gas flow path 4 increases. For this reason, time has passed since the accident of loss of coolant occurred, and the hydrogen treatment in the hydrogen treatment facility 1A reduces the concentration of hydrogen contained in the nitrogen gas present in the dry well, and the catalyst layer 2 of the hydrogen treatment facility 1A. Even if the calorific value of the gas decreases, low concentration hydrogen contained in the nitrogen gas can be treated.

  When both the in-house power supply and the external power supply are lost when the coolant loss accident occurs, current is supplied from the battery 6 to the control device. This control device is operated by a battery 6. The temperature sensor 7 can also measure the temperature by the current supplied from the battery 6. When the control device determines that the temperature measured by the temperature sensor 7 is equal to or higher than the set temperature and that both the in-house power source and the external power source are lost, a switch (not shown) provided in the cable 8 is connected. close up. A current is supplied from the battery 6 to the motor of the fan 5 through the cable 8, and the fan 5 is rotated. As described above, the rotation of the fan 5 increases the flow rate of nitrogen gas flowing in the gas flow path 4. Even when both the in-house power supply and the external power supply are lost when the coolant loss accident occurs, the hydrogen treatment facility 1A can treat the hydrogen contained in the nitrogen gas in the dry well.

  In the present embodiment, each effect produced in the first embodiment can be obtained. Since the fan 5 is provided, this embodiment can treat this hydrogen even if the concentration of hydrogen contained in the gas (for example, nitrogen gas) flowing into the hydrogen treatment facility 1A is reduced.

  The fan 5, the battery 6 and the temperature sensor 7 which are the configurations used in the present embodiment may be applied to the hydrogen treatment facility 1B of the third embodiment described later.

  A hydrogen treatment facility for a nuclear power plant according to embodiment 3, which is another embodiment of the present invention, will be described with reference to FIG. The hydrogen treatment facility 1B of the nuclear power plant of the present embodiment is a catalytic hydrogen treatment facility.

  The hydrogen treatment facility 1B has a configuration in which the heat insulating layer 3 is omitted from the hydrogen treatment facility 1 of the first embodiment. The other configuration of the hydrogen treatment facility 1B is the same as that of the hydrogen treatment facility 1.

  Similarly to the hydrogen treatment facility 1, the hydrogen treatment facility 1B recombines hydrogen contained in the nitrogen gas flowing into the gas flow path 4 with oxygen by the action of the catalyst metal (for example, platinum) in the catalyst layer 2. Let me handle it. Such a hydrogen treatment facility 1B does not have the heat insulation layer 3, and thus can obtain other effects other than the effects brought about by the heat insulation layer 3 among the effects produced in the first embodiment. The hydrogen treatment facility 1B can be downsized and improve the hydrogen treatment performance.

  Also in this embodiment, a plurality of annular catalyst layers 2 having different outer diameters are concentrically arranged, and nitrogen gas containing hydrogen flows between the innermost catalyst layer 2 and the catalyst layer 2. A gas flow path may be formed.

  A hydrogen treatment facility for a nuclear power plant according to embodiment 4, which is another embodiment of the present invention, will be described with reference to FIG. The hydrogen treatment facility 1C of the nuclear power plant of this embodiment is a catalytic hydrogen treatment facility.

  The hydrogen treatment facility 1C includes a plurality of plate-like catalyst cartridges 2A instead of the annular catalyst layer 2 as in the hydrogen treatment facilities 1A and 1B described above. The hydrogen treatment facility 1 </ b> C further includes a heat insulating layer 3 </ b> A and a casing 10. A plurality of plate-shaped catalyst cartridges 2 </ b> A are arranged in parallel in the casing 10 below the casing 10. In the casing 10, a plurality of gas flow paths 13 partitioned by a plurality of plate-shaped catalyst cartridges 2A are formed. These gas passages 13 communicate with a gas inlet 11 formed at the lower end of the casing 10. A gas outlet 12 formed in one side wall portion at the upper end of the casing 10 is also connected to each gas flow path 13. The heat insulating layer 3 </ b> A is installed on the outer surface of the casing 10 and covers the outer surface of the casing except for the gas inlet 11 and the gas outlet 12.

  In the hydrogen treatment facility 1C, a catalyst layer forming a gas flow path is formed by the plurality of catalyst cartridges 2A in the casing 10, and the heat insulating layer 3A surrounds the catalyst layer forming the gas flow path. .

  When a crack that penetrates the main steam pipe occurs in the reactor containment vessel and a coolant loss accident occurs, nitrogen gas containing hydrogen and oxygen in the dry well enters the gas flow path 13 from the gas inlet 11. Inflow. While the nitrogen gas is rising in the gas flow path 13, the hydrogen contained in the nitrogen gas reacts with the oxygen contained in the nitrogen gas by the action of the catalyst metal (for example, platinum) of the catalyst cartridge 2A. Become water. Nitrogen gas having a reduced hydrogen concentration due to the reaction with oxygen is discharged from the gas flow path 13, and further discharged to the outside of the hydrogen treatment facility 1 </ b> C, that is, to the dry well in the reactor containment vessel through the gas outlet 12. Is done. Since the reaction between hydrogen and oxygen is an exothermic reaction, the nitrogen gas whose temperature has risen in the gas flow path 13 becomes an upward flow and is discharged from the gas outlet 12 and in the dry well outside the hydrogen treatment facility 1C. Nitrogen gas is newly supplied into the gas flow path 13 through the gas inlet 11.

  Since the heat insulating layer 3A surrounds the outer surface of the casing 10, the amount of heat released from the inside of the casing 10 to the outside through the side wall of the casing 10 is reduced. Of the amount of heat generated by the recombination reaction between hydrogen and oxygen in the casing 10, the proportion of the amount of heat used for heating the nitrogen gas rising in the gas flow path 13 increases. For this reason, the temperature of the nitrogen gas in the gas flow path 13 further rises to promote the recombination reaction between hydrogen and oxygen, and the hydrogen treatment efficiency in the hydrogen treatment facility 1C is further improved.

  Since the temperature of the nitrogen gas in the gas flow path 13 further increases, the height from the chimney portion of the casing 10, that is, the upper end of the catalyst cartridge 2A to the gas outlet 12 can be reduced. Thereby, the hydrogen treatment facility 1C is downsized.

  The hydrogen treatment facility 1 </ b> C of the present embodiment does not have the annular catalyst layer 2, and thus obtains other effects other than the effects brought about by the annular catalyst layer 2 among the effects generated in the embodiment 1. Can do. The hydrogen treatment facility 1C of the present embodiment can be downsized and improve the hydrogen treatment performance.

  Each of the first to fourth embodiments described above can be applied to a boiling water nuclear plant and a pressurized water nuclear plant which are nuclear plants.

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C ... Hydrogen treatment equipment, 2 ... Catalyst layer, 2A ... Catalyst cartridge, 3, 3A ... Heat insulation layer, 4, 13 ... Gas flow path, 5 ... Fan, 6 ... Battery, 7 ... Temperature sensor ( (Accident detection sensor), 10 ... casing.

Claims (7)

  A hydrogen treatment facility for a nuclear power plant comprising an annular catalyst layer and a gas flow path formed inside the annular catalyst layer.   The hydrogen treatment facility for a nuclear power plant according to claim 1, wherein a blower for sucking a gas flowing in the gas flow path is disposed immediately above the gas flow path.   The hydrogen treatment facility for a nuclear power plant according to claim 1 or 2, wherein a heat insulating layer surrounds the circumference of the annular catalyst layer.   The annular catalyst layer includes a plurality of annular catalyst layers having different outer diameters, and these annular catalyst layers are arranged concentrically, inside the innermost annular catalyst layer, and adjacent annular layers. The hydrogen treatment facility for a nuclear power plant according to claim 1, wherein the gas flow path is formed between the catalyst layers.   The hydrogen treatment facility for a nuclear power plant according to claim 4, wherein a heat insulating layer surrounds the annular catalyst layer located on the outermost side among the annular catalyst layers arranged concentrically.   A hydrogen treatment facility for a nuclear power plant, comprising: a catalyst layer that forms a gas flow path; and a heat insulating layer that surrounds the catalyst layer.   A casing having a gas inlet formed at a lower end and a gas outlet formed at an upper end; the catalyst layer is disposed in the casing; the catalyst layer includes a plurality of catalyst cartridges; The hydrogen treatment facility for a nuclear power plant according to claim 6, wherein a flow path is formed between the catalyst cartridges.

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