JPH0399298A - Device for removing and collecting hydrogen in liquid metal and nuclear reactor plant incorporating this device - Google Patents

Abstract

PURPOSE:To lessen a load on a cold trap, to prolong the lifetime thereof and to reduce the cost of installation by a construction wherein a chamber having a hydrogen diffusing film through which hydrogen in a liquid metal diffuses is provided in the middle of a piping through which the liquid metal flows. CONSTITUTION:A chamber 3 having a hydrogen diffusing film 2 is provided in the middle of an Na piping 2 through which a liquid Na flow in an auxiliary cooling system of a nuclear reactor. A conduit connecting the chamber 3 with a hydrogen storing container 5 is provided with a blower 4. When the blower 4 is operated, the pressure in a conduit 8 on the suction side of the blower and the one in the chamber 3 are reduced, and hydrogen in an Na flow 17 diffuses through the hydrogen diffusing film 2 provided in the chamber 3 and separated and collected in the chamber 3. The hydrogen thus separated is introduced into the hydrogen storing container 5 through the conduit 8, occluded by a hydrogen occluding metal 7 sealed in the container 5 and collected. In this way, the hydrogen in Na can be separated and removed in the preceding stage of a cold trap of each loop of the auxiliary cooling system, and therefore the lifetime of the cold trap can be prolonged to a large extent.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a device for removing and collecting hydrogen in liquid metal, and a nuclear reactor plant incorporating this device, and particularly relates to a device for removing and collecting hydrogen in liquid metal, and a nuclear reactor plant incorporating this device. A hydrogen removal/collection device suitable for easily separating and removing hydrogen from liquid metals such as rNaJ), and a hydrogen removal/collection device suitable for extending the life of cold traps in nuclear reactors using this device. Regarding nuclear reactor plants.

[Prior Art] A large amount of hydrogen enters the secondary Na system of a nuclear reactor through the walls of the heat exchanger tubes of the steam generator. In the prior art, hydrogen was removed from the secondary Na-based Na using a cold trap. This cold trap is a container filled with metal mesh, and hydrogen in Na is
This is a method in which it is deposited as a hydride on a metal mesh and removed from Na. In this method, the metal mesh would become clogged as hydride capture progressed, so it was necessary to either take a regeneration method or replace the cold trap with a new one.

In addition to the conventional cold trap method, JP-A-63
As described in Japanese Patent No. 156507, it has been proposed to fill a container with a mesh made of a hydrogen storage alloy to capture hydrogen in Na. The hydrogen capture mechanism is liquid N
Metal hydride (MH
), but the decomposition pressure of MH must be lower than that of hydrogenated Na (NaH), which is the existing form of hydrogen in Na. need to be developed.

[Problem to be solved by the invention] The concentration of impurities such as hydrogen and oxygen present in Na produced and sold as a coolant for nuclear reactors is 0.5
ppm, oxygen is about 5 ppm, and when this Na is used in various test equipment and nuclear reactor plants, Na
Conventional technology has used a device called a cold trap to control the purity of impurities in Na, which utilizes the saturated solubility of impurities in Na to precipitate and capture them. Hydrogen diffuses from the walls of the hot tubes, and the cold traps are quickly clogged by this hydrogen. For this reason, a larger cold trap is required, but as described above, there are problems with the controllability of the temperature of the cold trap, the efficiency of capturing impurities, and the increased cost due to the larger size.

For this reason, it has been considered that after a predetermined amount of impurities has been captured in the cold trap, it should be regenerated or replaced with a new cold trap.

Here, we will discuss a large nuclear reactor plant as an example. The Na liquid contact surface area of all heat transfer tubes of the steam generator is approximately 3000 rr.
r, and assuming that the reactor plant will be operated for 30 years, the amount of hydrogen diffused and mixed into the secondary Na system will be approximately 1,300 kg, which is approximately 35 Tr when converted to volume. (Na
H conversion).

For example, if you install a cold trap with an impurity trapping volume of 1 port, it will take 30 years to capture all the hydrogen, even if you ignore impurities such as oxygen in Na, which is captured at the same time as hydrogen in the cold trap. A total of 35 cold traps are required.

Therefore, cold trap equipment cost, operation.

There was a problem that operating costs also increased.

The first object of the present invention is to provide a hydrogen removal/collection device for liquid metals that can efficiently diffuse and separate hydrogen from liquid metals such as liquid Na using simple equipment without using a cold trap. Our goal is to provide the following.

A second object of the present invention is to provide an apparatus for removing and collecting hydrogen in a liquid metal that can more efficiently diffuse and separate hydrogen from the liquid metal.

A third object of the present invention is to provide an apparatus for removing and collecting hydrogen in liquid metal, which can more accurately separate and remove hydrogen from liquid metal.

A fourth object of the present invention is to provide an apparatus for removing and collecting hydrogen in liquid metal that can be adjusted so that the pressure on the hydrogen suction side of the hydrogen storage container during operation is appropriate.

A fifth object of the present invention is that when the hydrogen diffusion membrane is damaged,
An object of the present invention is to provide a device for removing and collecting hydrogen in liquid metal that can block the inflow of liquid metal into the hydrogen conduit side.

A sixth object of the present invention is to provide an apparatus for removing and collecting hydrogen in a liquid metal that can stabilize hydrogen separated from the liquid metal.

Furthermore, the seventh object of the present invention is to provide a nuclear reactor that can extend the life of the cold trap provided in the auxiliary cooling system of the nuclear reactor, and that can significantly reduce equipment costs, operation costs, and operating costs. The goal is to provide plants.

An eighth object of the present invention is to provide a nuclear reactor plant in which hydrogen separated by diffusion from Na can be directly introduced into the exhaust tower of a nuclear reactor and treated.

[Means for Solving the Problems] The first object is to provide a room having a hydrogen diffusion membrane that diffuses hydrogen in the liquid metal in the middle of a pipe through which liquid metal flows, and to connect the room to this room via a conduit, This is achieved by connecting a hydrogen storage container filled with a hydrogen storage metal and providing a hydrogen introducing means for actively introducing hydrogen that has been diffused and separated in the room into the hydrogen storage container.

The second purpose is to install a lattice-shaped hydrogen diffusion membrane having a liquid metal flow path and a hydrogen diffusion 9 separation section in the pipe through which the liquid metal flows, and to install a lattice-shaped hydrogen diffusion membrane having a hydrogen diffusion 9 separation section in the pipe through which the liquid metal flows. In addition, a hydrogen diffusion membrane having a honeycomb structure having a liquid metal channel and a hydrogen diffusion/separation section is installed in the pipe through which the liquid metal flows; By providing this hydrogen diffusion membrane with a conduit for hydrogen that has been separated by diffusion, a hollow cylindrical hydrogen diffusion membrane is installed in the pipe through which the liquid metal flows, and this hydrogen diffusion membrane is

Diffusion 1 is achieved by providing a separate hydrogen conduit.

The third object is to install a plurality of hydrogen diffusion membranes at intervals in the flow direction of the liquid metal in the piping, and to provide each hydrogen diffusion membrane with a conduit for hydrogen that has been separated into two parts.
Furthermore, by providing the conduit with a blower as a means for introducing hydrogen, which suctions hydrogen from the hydrogen diffusion membrane side and sends the hydrogen under pressure to the hydrogen storage container, the hydrogen storage container is further supplied under reduced pressure. By enclosing a hydrogen storage metal that stores hydrogen and providing a vacuum pump as a hydrogen introduction means on the exhaust side of the hydrogen storage container, the hydrogen storage metal can also be formed into a thin wire shape, a mesh shape made of thin wires, This can be achieved by using at least one of the following: a small piece of a thin plate, a chip made from a thin plate, a ball made from a processed thin plate, and a porous block made from sintered metal.

The fourth purpose is to provide a pressure regulator on the hydrogen suction side of the hydrogen storage container, and a control device that controls the diffusion and collection rate of hydrogen in the liquid metal in conjunction with the pressure regulator. This is achieved by:

The fifth object is to provide a liquid metal leakage detector on the hydrogen extraction side of the hydrogen diffusion membrane, and when the leakage of liquid metal detected by the liquid metal leakage detector exceeds a set value, at least hydrogen is detected. This is achieved by deploying control equipment that closes off the conduits.

The sixth purpose is to install a hydrogen diffusion membrane that diffuses and separates the hydrogen in the liquid metal in the middle of the pipe through which the liquid metal flows, and to provide a conduit for the hydrogen that has been diffused and separated by the hydrogen diffusion membrane. This is achieved by installing a processing device in this conduit that oxidizes hydrogen and extracts it as water.

Furthermore, the seventh object is achieved by installing a device for removing and collecting hydrogen in liquid metal upstream of a cold trap provided in an auxiliary cooling system of a nuclear reactor.

The eighth purpose is to install the hydrogen diffusion membrane that diffuses and separates the hydrogen in the liquid sodium in the middle of the pipe through which liquid sodium flows, and to install a hydrogen diffusion membrane that separates the hydrogen in the liquid sodium into a conduit for the hydrogen that has been diffused and separated. This is achieved by providing a conduit and connecting this conduit to the exhaust tower of the reactor.

[Function] In the present invention, a chamber is provided in the middle of the pipe through which the liquid metal flows, and a hydrogen diffusion membrane made of, for example, nickel (Ni) is provided in this chamber. Hydrogen is separated by diffusion 9.

Hydrogen separated from the liquid metal enters the chamber and is sent to a hydrogen storage container via a conduit provided in this chamber.

A hydrogen storage metal such as FaTi alloy is sealed inside the hydrogen storage container. Furthermore, hydrogen introduction means is provided for actively introducing the hydrogen separated by diffusion into the hydrogen storage container.

As a result, hydrogen is actively fed into the hydrogen storage container from the conduit by the hydrogen introducing means.

The hydrogen sent into the hydrogen storage container is stored and collected by the hydrogen storage metal.

Therefore, in the present invention, hydrogen can be efficiently separated and removed from liquid metal with simple equipment without using a cold trap, and the separated hydrogen can be safely stored in the hydrogen storage metal in the hydrogen storage container. can do.

Furthermore, in the present invention, a lattice-shaped hydrogen diffusion membrane having a liquid metal flow path and a hydrogen diffusion and separation section is installed in the pipe through which the liquid metal flows, so that the hydrogen in the liquid metal and the hydrogen diffusion membrane are Since it comes into contact with a large surface area, hydrogen is diffused more efficiently from the liquid metal.

It becomes possible to separate.

Furthermore, in the present invention, a hydrogen diffusion membrane having a honeycomb structure having a liquid metal channel and a hydrogen diffusion/separation section is installed in the pipe through which the liquid metal flows, and in this invention also, the hydrogen in the liquid metal is Since the hydrogen-hydrogen diffusion membrane contacts with a large surface area, it becomes possible to diffuse and separate hydrogen from the liquid metal even more efficiently.

Furthermore, in the present invention, in the pipe through which the liquid metal flows,
A hollow cylindrical hydrogen diffusion separation membrane is installed, and in this invention, the hydrogen in the liquid metal comes into contact with the hydrogen diffusion membrane over a wide surface area, so hydrogen can be diffused and separated from the liquid metal even more efficiently. becomes possible.

Further, in the present invention, since a plurality of hydrogen diffusion membranes are installed at intervals in the flow direction of the liquid metal in the piping, hydrogen can be separated and removed from the liquid metal more accurately.

Further, in the present invention, a blower is provided in the conduit, and the blower sucks hydrogen from the hydrogen diffusion membrane side, and sends the hydrogen under pressure to the hydrogen storage container. Therefore, in the present invention, hydrogen can be more accurately separated and removed from the liquid metal by the action of the blower.

Furthermore, a hydrogen storage metal that stores hydrogen under reduced pressure is sealed in the hydrogen storage container, and a vacuum pump is provided on the exhaust side of the hydrogen storage container to supply vacuum to the hydrogen storage container and introduce hydrogen. ing. As a result, also in the present invention, hydrogen can be separated and removed from the liquid metal more accurately.

In the present invention, the hydrogen storage metal may be thin wire-like,
One type or a mixture of multiple types are used: a mesh made of thin wires, a chip made from a processed thin plate, a ball made from a similarly processed thin plate, or a porous lump made from sintered metal. Separates hydrogen from metals more accurately.

Can be removed.

Further, in the present invention, a pressure regulator is provided on the hydrogen suction side of the hydrogen storage container, and in conjunction with this pressure regulator, a relay or an automatic valve that controls the diffusion and collection rate of hydrogen in the liquid metal is controlled. Since the equipment is provided, the pressure on the hydrogen suction side of the hydrogen storage container during operation can be adjusted to be appropriate by setting the pressure regulator to an arbitrary pressure value.

Furthermore, in the present invention, a liquid metal leakage detector is provided on the hydrogen extraction side of the hydrogen diffusion membrane, and when the liquid metal leakage detected by the liquid metal leakage detector exceeds a set value, a control device is activated. However, at least the hydrogen conduit is closed.

Therefore, it is possible to reliably prevent liquid metal from flowing into the hydrogen conduit when the hydrogen diffusion membrane is damaged.

Further, in the present invention, hydrogen is oxidized in the hydrogen conduit,
Since we have installed a processing device that extracts water, we can convert the hydrogen separated from the liquid metal into water and stabilize it.

Furthermore, in the present invention, the hydrogen removal/collection device having the above configuration is provided with:
It is installed upstream of the cold trap installed in the auxiliary cooling system of the nuclear reactor.

During the operation of the nuclear reactor, the hydrogen that diffuses and mixes into the secondary Na system from the heat transfer tube wall of the steam generator is removed by the hydrogen diffusion membrane of the hydrogen removal/collection device at the stage before the cold trap. The hydrogen in Na is continuously diffused out of the Na loop system and separated.

Next, the separated hydrogen is actively introduced into the hydrogen storage container through the hydrogen introduction means through the conduit, and is stored in the hydrogen storage metal sealed in the hydrogen storage container.

Collect.

Therefore, with this invention, the load on the cold trap can be significantly reduced, and the life of the cold trap can be extended to the same extent as the service life of the nuclear reactor, resulting in a significant reduction in equipment costs, operation costs, and operating costs. be able to.

In the present invention, the hydrogen diffusion membrane is installed in the middle of the pipe through which liquid Na flows, and a hydrogen conduit is provided in this hydrogen diffusion membrane, and this conduit is connected to the exhaust tower of the reactor.
Diffused from inside a with a hydrogen diffusion membrane.

Separated hydrogen can be introduced directly into the reactor exhaust tower for treatment.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an embodiment in which the hydrogen removal/collection device of the present invention is connected to an auxiliary cooling system of a nuclear reactor.

In the embodiment shown in FIG. 1, a hydrogen diffusion membrane 2
A room 3 is provided.

The hydrogen diffusion film 2 is made of Ni or the like.

Said chamber 3 is connected to a hydrogen storage container 5 via a hydrogen conduit 8 . A hydrogen storage metal 7 is enclosed in the hydrogen storage container 5 so as to be surrounded by stainless steel mats arranged on the hydrogen intake side and the exhaust side of the hydrogen storage container 5. This hydrogen storage metal 7 includes, for example, CaNi.
, etc. are used. Furthermore, an exhaust pipe 14 is provided at the bottom of the hydrogen storage container 5.

A conduit 8 connecting the room 3 and the hydrogen storage container 5 is provided with a blower 4 serving as hydrogen introduction means. This blower 4 is of a non-leak type. Further, the blower 4 sucks hydrogen from the room 3 side through a conduit 8, pressurizes the hydrogen, and actively sends it to the hydrogen storage container 5 through the conduit 8. Note that the conduit 8 is provided with a bypass pipe 9 for the blower 4.

a conduit 8 between the room 3 and the blower 4; a bypass pipe 9;
An automatic valve 10 is provided in the conduit 8 between the blower 4 and the hydrogen storage container 5 and in the exhaust pipe 14. The hydrogen storage container 5
A pressure regulator 11 is provided in the conduit 8 on the hydrogen suction side. In the chamber 3 which is the hydrogen extraction side of the hydrogen diffusion membrane 2, there is a Na leak detector 13 which is a liquid metal leak detector.
is provided.

The automatic valve 10 and the blower 4 are electrically connected to the pressure regulator 11 and the Na leak detector 13 through a relay 12 . The automatic valve 10 and relay 12 are
It functions as a control device that works in conjunction with the pressure regulator 11 and the Na leak detector 13.

An exhaust system pipe 16 is connected to the exhaust pipe 14 provided in the hydrogen storage container 5 via a flange 15 .

In this embodiment, the hydrogen removal/collection device is installed upstream of a cold trap (not shown) provided in the auxiliary cooling system of the nuclear reactor.

The hydrogen removal/collection device of the above embodiment operates in conjunction with the cooling system of a nuclear reactor plant as follows.

In the cooling system of a nuclear reactor plant, hydrogen that has entered the Na side of the heat transfer tube wall of the steam generator flows through the secondary main circulation system, and a portion of it is extracted, purified, and returned to the secondary main circulation system for auxiliary cooling. Depending on the system, the target purity is constantly maintained.

In the auxiliary cooling system, hydrogen in Na is separated and collected by a hydrogen removal/collection device attached to the auxiliary cooling system.

That is, when the blower 4 of the hydrogen removal/collection device is operated, the conduit 8 on the suction side of the blower 4 and the chamber 3 are depressurized, and the hydrogen diffusion membrane 2 provided in the chamber 3 causes the inside of the Na pipe 1 to be Hydrogen in flowing Na stream 17 is diffused and separated into chamber 3.

The hydrogen separated in the chamber 3 passes through a conduit 8 and a blower 4, is pressurized by the blower 4, and is actively introduced into the hydrogen storage container 5 through the conduit 8.

A hydrogen storage metal 7 is sealed in the hydrogen storage container 5 via a gas filter, and the hydrogen introduced into the hydrogen storage container 5 is stored and collected in the hydrogen storage metal 7.

As a result, in this example, in each loop of the reactor's auxiliary cooling system, upstream of the cold trap.

Since hydrogen in Na can be separated and removed, the load on the cold trap can be significantly reduced, and therefore cold 1-
The life of the wrap can be significantly extended.

When it is desired to reduce the load on the blower 4 and when it is desired to change the separation rate of hydrogen diffusion 2 in Na.

When the set value of the pressure regulator 11 is changed, the relay 12 and the automatic valve 10 are operated in accordance with the changed set value.

Each part of the hydrogen removal/collection device is operated at the desired set values.

Furthermore, if the hydrogen diffusion membrane 2 is damaged, Na
leaks. When Na leaks into the room 3, N
a When the leakage of Na is detected by the leakage detector 13 and the amount of leakage exceeds the set value, the relay 12 and automatic valve 10 are activated.
is activated, the conduit 2 provided on the room 3 side is closed, and Na is prevented from flowing into the blower 4 side.

Next, FIG. 2 shows another embodiment of the hydrogen diffusion membrane in the hydrogen removal/collection device of the present invention, and is a sectional view taken in a direction perpendicular to the axial direction of the Na pipe.

The hydrogen diffusion membrane 18 shown in FIG. 2 is formed in a lattice shape having an Na flow path section 19 and a hydrogen diffusion/separation section 20, and is formed in a shape that fits within the Na pipe 1 as a whole. ing.

A hydrogen conduit 21 is provided in the hydrogen diffusion film 18 .

Since the hydrogen diffusion film 18 of the embodiment shown in FIG. 2 is formed in a lattice shape, the hydrogen in Na contacts with the hydrogen diffusion film 18 over a large surface area, so hydrogen can be removed from Na more efficiently. It becomes possible to separate well by diffusion.

Further, the hydrogen that has been diffused and separated by the hydrogen diffusion membrane 18 is transferred to the conduit 2.
1.

Furthermore, in the hydrogen diffusion film shown in FIG.

By configuring the honeycomb structure, hydrogen can be diffused and separated with high efficiency.

Next, FIG. 3 is a perspective view showing another embodiment of the hydrogen diffusion membrane of the hydrogen removal/collection device of the present invention.

The hydrogen diffusion membrane 22 of the embodiment shown in FIG. 3 is formed into a hollow cylindrical shape with an outer diameter having a circumferential gap between it and the inner circumferential surface of the Na pipe 1.

A hydrogen conduit 23 is provided in the body of the hydrogen diffusion membrane 22 .

The hydrogen diffusion membrane 22 shown in FIG. 3 is formed in a hollow cylindrical shape, and the hydrogen in Na contacts with the hydrogen diffusion membrane 22 over a large surface area, so hydrogen can be diffused more efficiently from Na. Can be separated.

Note that the hydrogen diffusion membrane shown in FIG. 3 may be formed in the shape of a hollow polygonal cylinder.

Another configuration of the embodiment shown in FIGS. 2 and 3.

The operation is similar to that of the embodiment shown in FIG. 1 above.

Next, various other embodiments will be described.

(1) In the hydrogen removal/collection device of the present invention, a plurality of hydrogen diffusion membranes as shown in FIGS. 1, 2, and 3 are installed at intervals in the Na flow direction, and each hydrogen diffusion membrane is The membrane may be provided with conduits through which hydrogen can be introduced into the hydrogen storage vessel.

(2) As the hydrogen introduction means, instead of the blower 4, a vacuum pump may be connected to the flange 15 shown in FIG. 1, and a hydrogen storage metal that stores hydrogen under reduced pressure may be enclosed in the hydrogen storage container 5. good.

(3) In the hydrogen storage container 5, the hydrogen storage metal may be in the form of a thin wire, a mesh made of thin wires, a small piece of a thin plate, a chip made of a thin plate, a ball made of a thin plate, or a sintered metal. One type or a mixture of multiple types of porous lumps may be used.

(4) The hydrogen storage container 5 may be provided with heating means or hot air supply means to heat the hydrogen once captured in the hydrogen storage metal, release it, and transfer it to another container.

(5) Flange 1 provided on the exhaust pipe 14 shown in Fig. 1
5, a processing device such as an oxidation furnace may be connected to oxidize the hydrogen separated by diffusion into water, stabilize it, and take it out.

(6) Connecting the exhaust system pipe 16 connected to the exhaust pipe 14 via the flange 15 to the exhaust tower of the reactor, and directly introducing the hydrogen that has been diffused and separated by the hydrogen diffusion membrane into the exhaust tower;
It may also be processed.

(7) The hydrogen removal/collection devices of each of the above embodiments can be applied not only to the cooling system of a nuclear reactor plant but also to general applications in which hydrogen is diffused and separated from liquid metal.

[Effects of the Invention] According to the invention described in claim 1 of the present invention described above, a chamber having a hydrogen diffusion membrane for diffusing hydrogen in the liquid metal is provided in the middle of the pipe through which the liquid metal flows, and A hydrogen storage container filled with a hydrogen storage metal is connected via a conduit, and a hydrogen introduction means is provided to actively introduce the hydrogen that has been diffused and separated in the room into the hydrogen storage container, thereby creating a cold trap. In addition to having the effect of efficiently separating and removing hydrogen from liquid metal with simple equipment without using a hydrogen storage container, this method also has the effect of safely storing the separated hydrogen in a hydrogen storage metal in a hydrogen storage container.

According to the description of claim 2 of the present invention, a lattice-shaped hydrogen diffusion membrane having a liquid metal channel and a hydrogen diffusion/separation section is installed in the pipe through which the liquid metal flows. Since the hydrogen in the liquid metal and the hydrogen diffusion membrane come into contact with each other over a wide surface area, hydrogen can be separated from the liquid metal more efficiently by diffusion.

Furthermore, according to the third aspect of the present invention, a liquid metal channel is provided in the pipe through which the liquid metal flows, and a hydrogen diffusion 2
In this invention, the hydrogen in the liquid metal comes into contact with the hydrogen diffusion membrane over a wide surface area, so hydrogen can be diffused from the liquid metal even more efficiently. There are effects that can be separated.

Furthermore, according to the fourth aspect of the present invention, a hollow cylindrical hydrogen diffusion separation membrane is installed in the pipe through which the liquid metal flows. Since it contacts with the diffusion membrane over a wide surface area, hydrogen can be more efficiently diffused and separated from the liquid metal.

Furthermore, according to the fifth aspect of the present invention, since a plurality of hydrogen diffusion membranes are installed at intervals in the flow direction of the liquid metal in the piping, hydrogen can be removed from the liquid metal even more efficiently. It has the effect of being well diffused.

Furthermore, according to the sixth aspect of the present invention, a blower is provided in the conduit, and the blower sucks hydrogen from the hydrogen diffusion membrane side, and pressurizes the hydrogen and sends it to the hydrogen storage container. Therefore, hydrogen can be more accurately separated and removed from the liquid metal by the action of the blower.

Furthermore, according to the seventh aspect of the present invention, a hydrogen storage metal that stores hydrogen under reduced pressure is sealed in the hydrogen storage container, and a vacuum pump is provided on the exhaust side of the hydrogen storage container to store hydrogen. Since a vacuum is supplied to the container and hydrogen is introduced, hydrogen can be more accurately separated and removed from the liquid metal.

According to the eighth aspect of the present invention, the hydrogen storage metal has a thin wire shape, a mesh shape made of thin wires,
Chips made from thin plates, balls made from thin plates, or porous lumps made from sintered metal are used in one type or in a mixture of several types.This allows hydrogen to be extracted from liquid metal more precisely. It has the effect of separating and removing.

Further, according to the invention described in claim 9 of the present invention.

A pressure regulator is provided on the hydrogen suction side of the hydrogen storage container, and a control device that controls the diffusion and collection rate of hydrogen in the liquid metal is provided in conjunction with this pressure regulator. By setting the pressure to an arbitrary pressure value, there is an effect that the pressure on the hydrogen suction side of the hydrogen storage container during operation can be adjusted to be appropriate.

Furthermore, according to the tenth aspect of the present invention, a liquid metal leakage detector is provided on the hydrogen extraction side of the hydrogen diffusion membrane, and the liquid metal leakage detected by the liquid metal leakage detector is set to a set value. When it exceeds the limit, the control equipment will operate
At least the hydrogen conduit is closed, so
This has the effect of reliably preventing liquid metal from flowing into the hydrogen conduit when the hydrogen diffusion membrane is damaged.

Furthermore, according to the eleventh aspect of the present invention, the hydrogen conduit is provided with a processing device that oxidizes hydrogen and extracts it as water, so that the hydrogen separated from the liquid metal is converted into water. It has the effect of stabilizing and removing it.

Furthermore, according to the invention described in claim 12 of the present invention, the hydrogen removal/collection device having the above configuration is installed on the upstream side of a cold trap provided in the auxiliary cooling system of the nuclear reactor. During operation, hydrogen that is constantly diffused and mixed into the secondary Na system by the heat transfer tube walls of the steam generator is removed from the Na solution through the hydrogen diffusion membrane of the hydrogen removal/collection device at the stage before the cold trap. Hydrogen is continuously diffused out of the Na loop system and separated, and the separated hydrogen is actively introduced into a hydrogen storage container through a hydrogen introducing means through a conduit, and is stored in a hydrogen storage metal sealed in this hydrogen storage container. Since the cold traps are collected, the load on the cold traps can be significantly reduced, and the lifespan of the cold traps can be extended to the same extent as the reactor lifespan, reducing equipment costs, operation, and operating costs. This has the effect of significantly reducing both costs.

According to the thirteenth aspect of the present invention, a hydrogen diffusion membrane is installed in the middle of a pipe through which liquid Na flows, a hydrogen conduit is provided in this hydrogen diffusion membrane, and this conduit is connected to an exhaust tower of a nuclear reactor. Since it is connected to the hydrogen diffusion membrane from Na, it can be diffused from Na
This has the effect of directly introducing the separated hydrogen into the reactor exhaust tower and processing it.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of one embodiment of the hydrogen removal/trapping device of the present invention connected to the auxiliary cooling system of a nuclear reactor, and Figure 2 is another embodiment of the hydrogen diffusion membrane in the hydrogen removal/trapping device of the present invention. This is a cross-sectional view in a direction perpendicular to the axial direction of the Na piping, and the third
The figure is a perspective view showing another embodiment of the hydrogen diffusion membrane of the hydrogen removal/collection device of the present invention. 1...Na pipe which is a pipe for flowing liquid metal, 2...
Hydrogen diffusion membrane, 3... Room having a hydrogen diffusion membrane, 4...
・Blower which is a means for introducing hydrogen and storing it in hydrogen storage metal under pressure, 5...Hydrogen storage container, 7...Hydrogen storage metal, 8...Hydrogen conduit, 10...Automatic valve, 1
DESCRIPTION OF SYMBOLS 1... Pressure regulator, 12... Relay, 13... Na leak detector which is a liquid metal leak detector, 14... Exhaust pipe, 16... Exhaust system pipe, 17... Na flow, 18
...Grid-like hydrogen diffusion membrane, 19...Liquid metal channel,
20... Hydrogen diffusion 2 separation section, 21... Same conduit, 2
2...Hollow cylindrical hydrogen diffusion membrane, 23...Hydrogen conduit.

Claims (1)

[Claims] 1. A hydrogen storage device in which a chamber having a hydrogen diffusion membrane that diffuses hydrogen in the liquid metal is provided in the middle of a pipe through which liquid metal flows, and a hydrogen storage metal is sealed in this chamber via a conduit. 1. An apparatus for removing and collecting hydrogen in liquid metal, characterized in that a hydrogen introducing means is provided to connect the container and to actively introduce hydrogen diffused and separated in the chamber into the hydrogen storage container. 2. A lattice-shaped hydrogen diffusion membrane having a liquid metal channel and a hydrogen diffusion/separation section is installed in the pipe through which the liquid metal flows, and a hydrogen diffusion membrane that has been diffused and separated is connected to the hydrogen diffusion membrane. 2. The device for removing and collecting hydrogen in liquid metal according to claim 1, further comprising: 3. A hydrogen diffusion membrane with a honeycomb structure having a liquid metal channel and a hydrogen diffusion and separation section is installed in the pipe through which the liquid metal flows, and a conduit for the diffused and separated hydrogen is installed in the hydrogen diffusion membrane. 2. The device for removing and collecting hydrogen in liquid metal according to claim 1, further comprising: 4. The liquid according to claim 1, wherein a hollow cylindrical hydrogen diffusion membrane is installed in the pipe through which the liquid metal flows, and a conduit for diffused and separated hydrogen is provided in the hydrogen diffusion membrane. Equipment for removing and collecting hydrogen in metals. 5. Claim 1, wherein a plurality of hydrogen diffusion membranes are installed at intervals in the flow direction of the liquid metal in the piping, and each hydrogen diffusion membrane is provided with a conduit for diffused and separated hydrogen. 5. The device for removing and collecting hydrogen in liquid metal according to any one of items 4 to 4. 6. Claims 1 to 5, characterized in that the conduit is provided with a blower as hydrogen introduction means that sucks hydrogen from the hydrogen diffusion membrane side and pressurizes the hydrogen and sends it into the hydrogen storage container.
The device for removing and collecting hydrogen in liquid metal according to any one of the above. 7. A hydrogen storage metal that stores hydrogen under reduced pressure is sealed in the hydrogen storage container, and a vacuum pump is provided as hydrogen introduction means on the exhaust side of the hydrogen storage container. The device for removing and collecting hydrogen in liquid metal according to any one of the above. 8. The hydrogen storage metal is at least in the form of a thin wire, a mesh made of thin wires, a small piece of a thin plate, a chip made of a processed thin plate, a ball made of a processed thin plate, or a porous lump made of sintered metal. 2. The device for removing and collecting hydrogen in liquid metal according to claim 1, wherein one type of hydrogen is used. 9. A pressure regulator is provided on the hydrogen suction side of the hydrogen storage container, and a control device is provided in conjunction with the pressure regulator to control the diffusion and collection rate of hydrogen in the liquid metal. The device for removing and collecting hydrogen in liquid metal according to any one of claims 1 to 8. 10. A liquid metal leak detector is provided on the hydrogen extraction side of the hydrogen diffusion membrane, and when the liquid metal leak detected by the liquid metal leak detector exceeds a set value, at least the hydrogen conduit is closed. The apparatus for removing and collecting hydrogen in liquid metal according to any one of claims 1 to 9, further comprising a control device. 11. Install a hydrogen diffusion membrane that diffuses and separates the hydrogen in the liquid metal in the middle of the pipe through which the liquid metal flows, and install a conduit for the hydrogen that has been diffused and separated by this hydrogen diffusion membrane. A device for removing and collecting hydrogen in liquid metal, characterized by being equipped with a processing device that oxidizes it and extracts it as water. 12. The device for removing and collecting hydrogen in liquid metal according to any one of claims 1 to 11 is installed on the upstream side of a cold trap provided in an auxiliary cooling system of a nuclear reactor. nuclear reactor plant. 13. The hydrogen diffusion membrane according to any one of claims 1 to 4, which diffuses and separates hydrogen in the liquid sodium, is installed in the middle of a pipe through which liquid sodium flows, and the hydrogen diffusion membrane diffuses and separates hydrogen in the liquid sodium. A nuclear reactor plant characterized by providing a hydrogen conduit and connecting this conduit to an exhaust tower of a nuclear reactor.