JPS6333112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nuclear fusion device having a blanket that generates internal heat, and particularly to a nuclear fusion device having a plurality of cooling grooves extending through a plurality of blanket plates provided in a blanket container to provide cooling. This relates to a nuclear fusion device with improved characteristics.

First, let's look at this type of conventional fusion device in Figure 1~
This will be explained with reference to FIG. In FIGS. 1 and 2, reference numeral 1 indicates plasma, and this plasma 1
A blanket 2 is provided so as to surround it, and a shield 3 is further provided outside the blanket 2. This shielding body 3 has a shielding function, and also has a function as a vacuum container by providing a vacuum wall inside or outside of the shielding body 3.
A toroidal coil 4 is wound around the outside of the shield 3, thereby confining the plasma 1. Further, a poloidal coil 5 for heating and controlling the plasma 1 is wound around the outside thereof.

FIG. 3 shows the structure of a conventional blanket, which mainly slows down neutrons and has a cooling mechanism inside. The blanket is on blanket board 6.
A large number of pipes 7 are embedded in this blanket plate 6 to form cooling channels. The large number of pipes 7 are arranged according to the neutron flux, and are arranged densely near the plasma 1 and sparsely near the plasma 1. The blanket plate 6 is made of a material with good workability, such as stainless steel.

Incidentally, since internal heat generation occurs in the blanket 2 due to neutrons from the plasma 1, it is necessary to cool it from the viewpoint of suppressing temperature rise. For this reason, cooling fluid such as water is caused to flow inside the embedded pipe 7 for cooling. A large number of pipes 7 branch out from the inlet header 8, enter the blanket 2, pass through the blanket 2, and are connected to the outlet headers 9, respectively.

In such a conventional device, the cooling pipe 7
and the blanket plate 6 were connected by silver soldering or other welding to improve heat conduction, but in reality,
It is impossible to connect the silver solder over the entire surface of each pipe 7, resulting in a drawback that the overall heat conduction between the pipe 7 and the blanket 2 is poor. Furthermore, since the blanket plates 6 were connected to each other by silver brazing, it was impossible to connect them over the entire surface in the same manner as described above, and a cavity was created inside, which became gas released during evacuation and caused the evacuation to be interrupted. There is a risk that it will be difficult to do so, and since the temperature is raised to about 800°C for silver brazing, the blanket plate 6 will be thermally deformed.
Gaps were created between the blanket plates, making connection difficult. Furthermore, the cooling pipes 7 are connected to both the inlet and outlet headers 8 and 9, but it is difficult to connect a large number of pipes to the headers in a limited location for reliable connection. was occurring.

In view of the drawbacks of the conventional apparatus, the present invention provides a plurality of cooling grooves that penetrate through a plurality of blanket plates provided in a blanket container, and connects both ends of the blanket container to an inlet header and an outlet via connecting pipes. The object of the present invention is to provide a nuclear fusion device that can be connected to a header, thereby improving cooling characteristics compared to conventional devices, and furthermore, reducing the number of piping and facilitating connection.

Embodiments of the present invention will be described below with reference to FIGS. 6 to 9.

Blanket plates 10 according to the present invention are stacked inside a blanket container 11, and connecting pipes 12 and 13 are connected to lids 11a and 11b at both ends of the blanket container 11. Further, an inlet header and an outlet header 14, 15 are connected to both the connecting pipes 12, 13, respectively. Further, a large number of cooling grooves 16 are provided in the blanket plates 10 stacked in the blanket container 11 in a direction perpendicular to the plane of the paper in FIG. The thickness and structure of the blanket container 11 are designed to sufficiently withstand the pressure of the fluid flowing in the cooling grooves 16.

In such a configuration, the cooling fluid enters through the inlet header 14 and enters a flow regulating chamber (not shown) in the blanket container 11 located in the same position as a similar flow regulating chamber 18 located in an opposing position. ), passes through a large number of cooling grooves 16 to reach the other flow rate adjustment chamber 18 , and enters the outlet header 15 .
is discharged. The cooling fluid does not flow in pipes as in conventional fusion devices;
Since it flows while being in direct contact with the blanket plate 10, it has good heat conduction characteristics.

As described above, the present invention provides a nuclear fusion device having a blanket for confining plasma, in which a blanket container is provided which is connected to an inlet header and an outlet header via a connecting pipe, and blanket plates are stacked and installed in the blanket container. Since a large number of cooling grooves are provided in the plurality of blanket plates to allow the cooling fluid to flow from the inlet header, a large number of pipes are separately provided in the blanket plate and the cooling fluid flows therein, unlike the conventional method. Compared to the above method, the cooling fluid flows directly into the cooling grooves of the blanket plate, resulting in better heat conduction and extremely good cooling characteristics. Furthermore, since the number of piping to the outside of the blanket is reduced, connection becomes easier and reliability is improved. Furthermore, by storing the blanket board inside the blanket container,
It is possible to reliably prevent the refrigerant from leaking to the outside. Furthermore, since the blanket plate is not directly exposed to the ultra-high vacuum region, gases can be prevented from being released from the surface of the blanket plate, and problems associated with evacuation can be avoided.

Further, by forming the flow rate adjustment chambers at both ends of the blanket container, it is possible to equalize the flow of the cooling fluid flowing in the refrigerant groove.

[Brief explanation of drawings]

Figures 1 to 5 show conventional nuclear fusion devices, with Figure 1 being a longitudinal sectional view of the fusion device, Figure 2 being a horizontal sectional view, and Figure 3 showing a blanket incorporated in the fusion device. 4 is a right side view of FIG. 3, FIG. 5 is a sectional view taken along the line - in FIG. 3, FIG. 6 is a front view of the blanket incorporated in the nuclear fusion device of the present invention, and FIG. 6 is a right side view of FIG. 6, FIG. 8 is a sectional view taken along the line --- in FIG. 6, and FIG. 9 is an enlarged detailed view of section A in FIG. 6. 1... Plasma, 2... Blanket, 3... Shielding body, 4... Toroidal coil, 5... Poloidal coil, 6, 10... Blanket plate, 7... Pipe, 1
1...Blanket container, 12, 13...Connecting pipe, 1
4...Inlet header, 15...Outlet header, 16...
Cooling groove, 18...Flow rate adjustment chamber.

Claims (1)

[Claims] 1. In a nuclear fusion device having a blanket that confines plasma inside, the blanket has a blanket container connected to an inlet header and an outlet header, respectively, and accommodates stacked blanket plates in the blanket container, and A plurality of cooling grooves are provided in each of the blanket plates, and the cooling grooves form a flow path for cooling fluid extending in the longitudinal direction of the blanket container, and flow rate adjustment chambers are provided at both ends of the blanket container to communicate with each cooling groove. , and each of the flow rate adjustment chambers is connected to the inlet header and the outlet header via connecting pipes, respectively.