JPS58213404A - Superconductive energy storage device in shape of toroidal coil - Google Patents

Abstract

PURPOSE:To utilize the useless space in a superconductive coil effectively and at the same time raise stability of the device by using the inner space of a toroidal coil as a cooling medium storage tank. CONSTITUTION:Liquid helium is produced by a helium liquefaction machine, and it is stored in a dummy vessel 8 through a piping 6'. When a specified volume of liquid helium is produced and stored, the supply tube of the piping 6' and the supply tube of a piping 6 from the dummy vessel 8 are connected to transfer the liquid helium to a liquid helium vessel 3 that has a superconductive coil 2 in it. When the vessel 3 is filled with the liquid helium, the device starts operating. The liquid helium in the liquid helium vessel which decreased during operation can be replenished from the dummy vessel 8 continuously in the same manner. Further, liquid helim produced during operation by the helium liquefaction machine can also be stored in the dummy vessel 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to superconducting energy storage devices, and more particularly to improvements in toroidal coil superconducting energy storage devices.

A superconducting energy storage device is considered to be of the Niga type, which includes a solenoid-like superconducting coil and a toroidal-like superconducting coil. The former requires a little less superconducting wire, and the latter has no leakage Qp, and is characterized by the fact that the electromagnetic force can be extremely small by designing the large radius to be large and the small radius to be small. Although superconducting energy storage devices are currently in the conceptual design stage and no large-scale devices have been constructed, they are an essential device in the future for smoothing peak power.

The most immediate future demand is tens to hundreds of gigabytes for fusion reactors.
It is considered a joule-scale device.

An example of a conventional toroidal coil superconducting energy storage device is a cryostat system, and its configuration is shown in the first example.
As shown in Fig. and Fig. 2. In Fig. 1, a superconducting coil 2 is placed inside, and around it a liquid helium container 3, a radiation heat insulating plate 4,
A superconducting energy storage bag [1] is shown in which vacuum containers 5f are sequentially arranged and configured in a donut shape. Piping 6 is for injecting liquid helium into a liquid helium container or recovering (vaporized helium gas), and piping 7 is for radiant heat insulation plate 4
The purpose is to completely inject or recover liquid nitrogen to cool it down. As is clear from this figure, the space inside the superconducting coil 2 is a wasted space, which significantly increases the amount of liquid helium filled, which causes an increase in operating costs. Figure 2 has almost the same configuration as Figure 1, but
Eliminate wasted space inside the superconducting coil 2.
This is an example in which a dummy container 8 is arranged to reduce the amount of liquid helium filled. The dummy container 8 is naturally a vacuum container,
Moreover, it must be destroyed unless it is a pressure vessel. Therefore, the overall weight of the device increases, resulting in increased construction and operating costs. Furthermore, even if the dummy container 8 is placed, this space remains a wasted space with no use value.

The present invention has been developed in view of the above points, and its purpose is to effectively utilize the wasted space of superconducting coils and to improve the stability of the device. There are a lot of things to offer.

The present invention achieves the intended purpose by using a toroidal coil internal space as a tank for storing the entire refrigerant.

Hereinafter, the present invention will be described in detail based on embodiments of the drawings. Note that the same reference numerals are used for the same items as in the past. No.! An embodiment of the present invention is shown on land, where the dummy container 8 is used as a liquid helium storage container. In devices with stored energy of several tens to several gigajoules, the amount of liquid helium used is on the order of tens of thousands to hundreds of thousands of liters.

Vl with superconducting energy storage device that can replace pumped storage power plants
It is said to amount to several million liters. Instead of preparing a separate container for storing such a large amount of liquid helium, the dummy container 8 is used for this purpose. For that,
Simply adding piping 67 is sufficient. The method for cooling the superconducting coil is similar to the method for cooling a small superconducting magnet. First, liquid helium is produced in a helium liquefaction machine, and this is stored in a dummy container 8 through a pipe 6'. At this time, if all the incoming pipes of the pipe 6' and the outgoing pipes of the pipe 6 are connected, it can be expected that not only will it contribute to the cooling of the superconducting coil 2, but also that the storage efficiency will be improved. Furthermore, since the dummy container 8 and the liquid helium container 3 are used at almost the same pressure and temperature, they do not need to be pressure containers, and the thickness of the material can be made thinner, thereby eliminating the above-mentioned drawbacks. When a predetermined amount of liquid helium is generated and stored by the liquefier, the dummy container 8 is connected to the outgoing pipe of piping 6' and the outgoing pipe of piping 6, and the liquid helium container containing the liquid helium gold superconducting coil 2 is connected. 3, and once the money is filled, the device will be in operation.

The reduced amount of liquid helium in the liquid helium container during operation can be successively replenished from the dummy container 8 using the same method. It is also possible to store the liquid helium in the kedummy container 8 produced by the IJium liquefaction machine during operation. Since the dummy container 8 is surrounded by liquid helium, the storage efficiency is extremely high.

An additional effect expected from the present invention is that it is extremely suitable for safety protection measures for superconducting energy storage devices. If a device that possesses energy of several tens of gigajoules or more is destroyed, the damage will be severe, not only to the device itself but also to its surroundings. Especially in the case of superconducting coils,
When the superconducting state breaks down, the cold liquid helium vaporizes all at once, and the pressure inside the liquid helium container 3 rises rapidly.
Its destruction? invite Naturally, the protection of the superconducting coils and the containers have been thoroughly considered and countermeasures have been taken, but to be on the safe side, it is necessary to ensure that the superconducting coils and containers are protected at the same time that the superconducting coils and containers are protected. If the liquid Q and lll rams are transferred to another location, a sudden pressure rise can be avoided and it is extremely safe. That is, if the pipes 6 and 6' are properly connected at this point so that the liquid helium can be transferred to the dummy container 8, the pressure increase in the liquid helium container 3 can automatically transfer the liquid helium.

If it can be transferred as a liquid, the transfer time will be shortened, the pressure increase will be minimized, and liquid helium can be recovered, making it possible to minimize losses without going through extremely dangerous conditions. .

FIG. 4 shows another embodiment of the invention. This is just a simplified version of the piping connection shown in Figure 3, and its functions and effects are exactly the same. That is, the liquid helium container 3 and the dummy container 8 are connected through a communication pipe 9, and the liquid helium is transferred by controlling the pressure between the two containers. Needless to say, fL shown in FIG.
The control may be facilitated by supplementing the pipe 6' etc. 9 or providing pulp in the communication pipe 9. Compared to the method shown in FIG. 3, the efficiency of transferring liquid helium between the liquid helium container 3 and the dummy container 8 is extremely high because the communication pipe 9 is always kept at the same temperature as the liquid helium. .

Although only one pipe is shown in FIGS. 3 and 4, a plurality of pipes may be installed depending on the scale of the apparatus.

According to the present invention described above, the space inside the toroidal coil can be used as a space for storing liquid helium, and there is no need to construct a separate storage tank, and in the event of an emergency when the superconducting coil loses its superconductivity. It can also be used as a space for collecting liquid helium in a liquid helium container, minimizing pressure rise in the system, and is extremely effective from both an economic and safety standpoint, and is useful for constructing superconducting energy storage devices. The contribution is enormous.

[Brief explanation of the drawing]

1 and 2 are sectional views showing a conventional toroidal coil superconducting energy storage device, and FIG. 3 is an embodiment of the toroidal coil superconducting energy storage device according to the present invention. FIG. 4 is a sectional view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Toroidal coil-shaped superconducting energy storage device, 2... Superconducting coil, 3... Liquid helium container, 4... Radiation insulation board, 5... Vacuum container, 6.6'
...Liquid helium supply and discharge pipe, 7...Liquid nitrogen supply and discharge pipe, 8
...Dummy Figure 71') I2 Figure Otsu 3.3 [¥1 6 Figure 4

Claims (1)

[Claims] 1. A toroidal coil superconducting energy storage device characterized in that the internal space of the toroidal coil is configured as a refrigerant storage tank. 2. A toroidal coil superconducting energy storage device, characterized in that the refrigerant storage tank described in claim 1 and the toroidal coil container are connected through a communication port.