KR101513816B1 - Super conducting electric power generation system - Google Patents

Abstract

The present invention relates to a super conducting electric power generation system. A super conducting electric power generation system according to an embodiment of the present invention includes: a rotator in which a field magnet including a super conducting coil, and a cooling chamber which is rotated with the field magnet, surrounds the super conducting coil, and is filled with a first coolant; a stator which surrounds the rotator and includes an armature; a rotation shaft which is connected to the rotator to transmit power and has a hollow part of the rotation shaft; an ultra-low temperature coolant supply device which cools a second coolant and supplies the same; and a heat exchanger which exchanges the second coolant which is installed to the hollow part of the rotation shaft and is supplied to the ultra-low temperature coolant supply device for the first coolant which is filled with the cooling chamber of the rotator.

Description

[0001] SUPER CONDUCTING ELECTRIC POWER GENERATION SYSTEM [0002]

An embodiment of the present invention relates to a superconducting power generation system, and more particularly, to a superconducting power generation system for cooling a superconducting coil using a plurality of coolants.

Generally, a superconducting generator is a generator that uses superconductivity phenomenon in which electrical resistance disappears at an absolute temperature of OK, ie, -273 ° C. Early superconducting generators use wire materials that generate superconducting phenomena within an absolute temperature range of 4K to 20K. Recently, materials for superconducting phenomena have been found at relatively high absolute temperatures of 30K to 77K, accelerating the development of superconducting generators have.

Most of the superconducting generators currently developed have a structure in which superconducting coils replace the copper coils used in the field generators in the superconducting generators.

Thus, when a field is formed with a superconducting coil, a magnetic field of a high magnetic field can be produced without loss due to electrical resistance. Thus, superconducting generators can have improved efficiency and reduced size and weight as compared to a superconducting generator.

However, in order to allow a current to flow through a superconducting coil made of superconducting wire without a resistor, a cooling system for cooling a field provided with a superconducting wire to a cryogenic temperature is further required. Nevertheless, the superconducting wire can flow more current than the copper wire without resistance, so that the loss can be reduced compared to the normal-mode generator because the loss is close to zero and the total loss can be reduced considerably.

However, since the operating temperature of a field coil with superconducting windings is very low, it is necessary to use a refrigerant with a low liquid point to use it.

Conventionally, the superconducting coils are cooled using the heat of vaporization generated when the liquefied refrigerant is phase-changed into gas. However, since a certain amount of refrigerant is used for cooling the superconducting coil, the initial cooling time is usually delayed. Further, since the refrigerant circulation is not smooth, there is a problem that the cooling time is prolonged not only in the initial cooling section but also in the transient cooling section.

Japanese Patent Application Laid-Open No. 10-2013-0107641 (Oct. 20, 2013) Published Japanese Patent Application No. 10-2004-0009260 (January 31, 2004) Japanese Patent Application Laid-Open No. 10-2000-0060116 (October 16, 2000)

An embodiment of the present invention provides a superconducting power generation system capable of effectively cooling a superconducting coil.

According to an embodiment of the present invention, a superconducting power generation system includes a rotor including a field including a superconducting coil and a cooling chamber surrounding the superconducting coil while being rotated together with the field and filled with a first coolant, A cryogenic coolant supply device connected to the rotor to transmit a rotational power and having a rotation shaft hollow portion and a cryogenic coolant supply device for cooling and supplying the second coolant to a cryogenic temperature, And a heat exchanger for exchanging heat between the second refrigerant supplied by the cryogenic coolant supply device and the first refrigerant filled in the cooling chamber of the rotor.

The superconducting power generation system may further include a first refrigerant pipe connecting the cooling chamber of the rotor and the heat exchanger, and a second refrigerant pipe connecting the cryogenic refrigerant supply device and the heat exchanger.

The second refrigerant pipe may connect a non-rotating cryogenic coolant supply device with a heat exchanger installed in a hollow portion of the rotating shaft. The superconducting power generation system may further include a rotary coupling installed on the rotary shaft and connecting the non-rotary section and the rotary section of the second refrigerant tube.

The cryogenic coolant supply device may include a cryogenic cooler for cooling the second coolant recovered after heat exchange with the first coolant in the heat exchanger to a cryogenic temperature again.

The first refrigerant is maintained in a solid state in the cooling chamber of the rotor, and the second refrigerant can circulate between the cryogenic coolant supply device and the heat exchanger in a liquid state.

The first refrigerant may be nitrogen and the second refrigerant may be a neon.

Further, the rotor may further include a polygonal tubular torque disk for transmitting rotational power of the rotating shaft. The field magnet may further include a support plate coupled to an outer surface of the torque disc, and a bobbin plate having the superconducting coil wound thereon and the one side thereof being removably slidably coupled to the support plate.

The rotor may further include a prismatic refrigerant eccentricity preventing part coupled to the other side of the bobbin plate.

The torque disc may have a disc hollow portion in a vacuum state.

The rotor further includes an adiabatic chamber surrounding the cooling chamber, and the space between the cooling chamber and the adiabatic chamber may be in a vacuum state.

According to the embodiment of the present invention, the superconducting power generation system can effectively cool the superconducting coil.

1 is a configuration diagram of a superconducting power generation system according to an embodiment of the present invention.
Figure 2 is a cross-sectional view of the rotor of Figure 1;
3 is an enlarged cross-sectional view of the field of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures are shown exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive. And to the same structure, element or component appearing in more than one drawing, the same reference numerals are used to denote similar features.

The embodiments of the present invention specifically illustrate ideal embodiments of the present invention. As a result, various variations of the illustration are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture.

Hereinafter, a superconducting power generation system 101 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.

1, a superconducting power generation system 101 according to an embodiment of the present invention includes a rotary shaft 400, a rotor 200, a stator 300, a cryogenic coolant supply device 900, (600).

The superconducting power generation system 101 according to an embodiment of the present invention may further include a first refrigerant pipe 510, a second refrigerant pipe 520, and a rotary coupling 550.

Further, although not shown, the superconducting power generation system 101 according to an embodiment of the present invention may further include an engine that provides rotational power to the rotating shaft 400. [ That is, the superconducting power generation system 101 can generate electricity through rotational power supplied from the engine.

The rotating shaft 400 is connected to the rotor 200 to transmit rotational power to the rotor 200. In an embodiment of the present invention, the rotary shaft 400 may have a rotary shaft hollow 409.

Also, in one embodiment of the present invention, the superconducting power generation system 101 may be of a rotary field type in which the stator 300 becomes an armature and the rotor 200 becomes a field. However, the embodiment of the present invention is not limited thereto, and the superconducting power generation system 101 may be formed as a rotating electrical machine.

2, the rotor 200 includes a field magnet 210, a torque disc 250, a cooling chamber 240, a heat insulating chamber 280, and a coolant eccentricity preventing portion 230 .

The torque disc 250 receives the rotational power of the rotating shaft 400. That is, the rotor 200 rotates by the rotational power transmitted from the rotational shaft 400 to the torque disc 250.

In one embodiment of the present invention, the torque disc 250 may be formed in a polygonal shape. However, the embodiment of the present invention is not limited thereto.

Further, the torque disc 250 is formed in a hollow shape, and the inside of the torque disc 250, i.e., the disc hollow 259, is maintained in a vacuum state. Thus, the disk hollow portion 259 of the torque disk 250 has a vacuum insulation effect, and heat can be prevented from entering the rotary shaft 400.

The field 210 includes a bobbin plate 211 on which a superconducting coil is wound and a support plate 215 slidably engaged with the bobbin plate 211, as shown in Fig. The support plate 215 is engaged with the outer surface of the polygonal tubular torque disk 250. A refrigerant eccentricity preventing portion 230 is coupled to the other side of the bobbin plate 211 which is slidably coupled to the supporting plate 215. Here, the refrigerant eccentricity preventing portion 230 may include a prism shape.

The superconducting coil wound on the bobbin plate 211 can be made of a wire material which generates a superconducting phenomenon at a cryogenic temperature, that is, within an absolute temperature range of 4K to 100K. Superconductor wire rods are known to those skilled in the art.

When the current flows through the superconducting coil at a very low resistance, a magnetic field is generated. In order to generate a high operating current of the superconducting coil, the superconducting field coil should be maintained at a cryogenic temperature below the critical temperature.

As shown in FIG. 1, the cooling chamber 240 surrounds the field 210 including the superconducting coil. Inside the cooling chamber 240, the first refrigerant is filled. The refrigerant eccentricity preventing portion 230 prevents the first refrigerant filled in the cooling chamber 240 from being eccentric as the rotor 200 rotates.

Further, in one embodiment of the present invention, the cooling chamber 240 serves as a damper. An electromagnetic force may be generated between the stator 300 and the rotor 200 due to the characteristics of the superconducting power generation system 101 and the cooling chamber 240 may act as a damper to generate abnormalities between the stator 300 and the rotor 200 Thereby preventing generation of harmonics and the like.

In addition, the rotor 200 may further include a coolant inlet 247 for initially injecting the first coolant into the coolant chamber 240. Meanwhile, the first refrigerant may be recovered from the cooling chamber 240 through the refrigerant inlet 247, and a new first refrigerant may be injected.

According to an embodiment of the present invention, the first refrigerant in a state close to a cryogenic temperature is directly injected into the cooling chamber 240 through the refrigerant injection port 247, so that the cryogenic refrigerant supply device 900 can be operated 210 superconducting coils can be quickly cooled.

The adiabatic chamber 280 surrounds the cooling chamber 240 and the space between the adiabatic chamber 280 and the cooling chamber 240 is maintained in a vacuum state. That is, the adiabatic chamber 280 prevents the heat from entering the cooling chamber 240 from the outside. Specifically, the adiabatic chamber 280 protects the superconducting coil of the field 210 to be cooled from unintended heat exchange and external disturbance by convection.

The stator 300 surrounds the rotor 200. In one embodiment of the present invention, the stator 300 may use a normal conducting coil such as copper or aluminum.

Further, in one embodiment of the present invention, the core in which the armature coil of the stator 300 is wound may be formed of glass fiber reinforced plastic (GFRP) though not shown. Since the core formed of the glass fiber reinforced plastic has air-like characteristics on the side of the magnetic flux, the high magnetic field generated in the superconducting coil of the field 210 can be transmitted to the armature coil of the stator 300 without magnetic saturation. The core formed of the glass fiber reinforced plastic has a light weight and excellent mechanical strength as compared with the core of the normal electric power generator.

The heat exchanger 600 is installed in the rotary shaft hollow portion 409 of the rotary shaft 400 and is provided with a second refrigerant supplied from a cryogenic coolant supply device 900 to be described later and a refrigerant filled in the cooling chamber 240 of the rotor 200 1 heat exchanges the refrigerant with each other.

The first refrigerant pipe (510) connects the cooling chamber (240) of the rotor (200) and the heat exchanger (600). The second refrigerant pipe (520) connects the cryogenic coolant supply device (900) and the heat exchanger (600). That is, the first refrigerant circulates through the first refrigerant pipe 510 to the cooling chamber 240 of the rotor 200 and the heat exchanger 600, and the second refrigerant circulates through the second refrigerant pipe 520 at a very low temperature And circulates the refrigerant supply device 900 and the heat exchanger 600.

The second refrigerant pipe 520 connects the non-rotating cryogenic coolant supply device 900 with the heat exchanger 600 installed in the rotating shaft hollow 409. Therefore, the second refrigerant pipe 520 is divided into the non-rotating section 522 and the rotating section 521.

The rotary coupling 550 is installed on the rotary shaft 400 and connects the non-rotary section 522 of the second refrigerant pipe 520 with the rotary section 521. In addition, in one embodiment of the present invention, the rotary coupling 550 may have a variety of structures known to those skilled in the art.

In one embodiment of the present invention, the cryogenic coolant supply device 900 is configured to cool the second coolant through the heat exchange with the first coolant directly cooling the superconducting coil of the rotor 200 to an extremely low temperature state Supply.

Specifically, the cryogenic coolant supply device 900 may include a refrigerator 910, a condenser 920, and a heater 930.

In addition, the cryogenic coolant supply device 900 may further include a liquefaction storage tank 950 and a coolant replenishing tank 990.

A cryogenic cooler 910 absorbs the heat of the second refrigerant vaporized. The condenser 920 condenses and re-liquefies the second refrigerant cooled in the freezer 910. The condenser 920 is installed at the end of the refrigerator 910 and has a structure in which the contact area is enlarged to effectively re-liquefy the vaporized cryogenic refrigerant to the maximum to be cooled below the operating temperature. The liquefied storage tank 950 stores the second refrigerant in a cryogenic state that has been liquefied through the condenser 920 and supplies the second refrigerant to the second refrigerant pipe 520. Here, the liquefied storage tank 950 may be omitted, and the second refrigerant liquefied in the condenser 920 may be moved along the second refrigerant pipe 520 directly without going through the liquefied storage tank 950.

Meanwhile, the heater 930 is disposed between the refrigerator 910 and the condenser 920 to prevent the second refrigerant from solidifying.

The coolant replenishing tank 990 is used to fill the cryogenic coolant supply device 900 with the second coolant during the initial operation of the superconducting power generation system 101 or to replenish the second coolant discharged during operation.

As described above, in the embodiment of the present invention, while the second refrigerant repeatedly phase-changes between the vaporized state and the liquefied state, the condenser 920 or the liquefied storage tank 950 and the heat exchanger 600 are spontaneously circulated by gravity, Lt; / RTI > However, for effective cooling as required, the cryogenic coolant supply device 900 may further include a circulation pump (not shown) for forcibly circulating the second refrigerant.

In addition, in an embodiment of the present invention, the cryogenic coolant supply device 900 is not limited to the above-described one, and may be modified into various structures known to those skilled in the art.

Also, in one embodiment of the present invention, the first refrigerant in the cooling chamber 240 of the rotor 200 may be maintained in a solid state. The second refrigerant circulates between the cryogenic coolant supply device 900 and the heat exchanger 600 in a liquid state to cool the first refrigerant. As an example, the first refrigerant may be nitrogen and the second refrigerant may be neon.

With this structure, the superconducting power generation system 101 according to an embodiment of the present invention can effectively cool the field 210 including the superconducting coil.

According to one embodiment of the present invention, the cooling time can be reduced when the superconducting coil is initially cooled down to the operating temperature. In addition, since the cooling chamber 240 filled with the first refrigerant can perform a function of a damper for preventing quench and equipment damage caused by an abrupt temperature increase of the superconducting coil by an external heat source, Can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be.

It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

101: Superconducting power generation system
200: Rotor 210: Fielder
240: cooling chamber 247: refrigerant inlet
250: torque disc 280: insulating chamber
300: stator 400: rotating shaft
409: rotating shaft hollow part 510: first refrigerant tube
520: second refrigerant tube 550: rotary coupling
600: heat exchanger 900: cryogenic refrigerant supply device
910: refrigerator 920: condenser
930: Heater 950: Liquid storage tank
990: Refrigerant supplement tank

Claims (10)

A rotor including a field coil including a superconducting coil and a cooling chamber surrounding the superconducting coil while being rotated together with the field, the cooling chamber being filled with a first coolant;
A stator surrounding the rotor and including an armature;
A rotating shaft connected to the rotor to transmit rotational power and having a rotating shaft hollow portion;
A cryogenic coolant supply device for cooling and supplying the second coolant to a cryogenic temperature;
A heat exchanger installed in a hollow portion of the rotary shaft of the rotary shaft for exchanging heat between the second refrigerant supplied by the cryogenic coolant supply device and the first refrigerant filled in the cooling chamber of the rotor; And
The rotor has a polygonal tubular torque disk
/ RTI >
Wherein the field comprises a support plate coupled to an outer surface of the torque disc and a bobbin plate having the superconducting coil wound and one side slidably coupled to the support plate. The method of claim 1,
A first refrigerant pipe connecting the cooling chamber of the rotor and the heat exchanger;
A second refrigerant pipe connecting the cryogenic coolant supply device and the heat exchanger
The superconducting power generation system further comprising: 3. The method of claim 2,
Wherein the second refrigerant pipe connects the non-rotating cryogenic coolant supply device with a heat exchanger installed in a hollow portion of the rotating shaft,
Further comprising a rotary coupling installed on the rotary shaft for connecting a non-rotating section and a rotating section of the second refrigerant tube. The method of claim 1,
Wherein the cryogenic coolant supply device includes a cryogenic coole that cools the second refrigerant recovered after heat exchange with the first refrigerant in the heat exchanger to a cryogenic temperature again. The method of claim 1,
The first refrigerant in the cooling chamber of the rotor is maintained in a solid state,
And the second refrigerant circulates between the cryogenic coolant supply device and the heat exchanger in a liquid state. The method of claim 5,
Wherein the first refrigerant is nitrogen and the second refrigerant is neon. delete The method of claim 1,
Wherein the rotor further comprises a prismatic refrigerant eccentricity preventing part coupled to the other side of the bobbin plate. The method of claim 1,
Wherein the torque disc has a hollow disc portion in a vacuum state. The method of claim 1,
The rotor further comprising an adiabatic chamber surrounding the cooling chamber,
Wherein the space between the cooling chamber and the heat insulating chamber is in a vacuum state.

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