KR20100120529A - Device for heating a simulated core in sodium cooled fast reactor system - Google Patents

Abstract

PURPOSE: A device for heating a simulated core in a sodium cooled fast reactor system is provided to directly heat molten metal having a low melting point using an electrode rod provided with low-voltage and high-current power. CONSTITUTION: A device for heating a simulated core in a sodium cooled fast reactor system uses molten metal including alkali metal containing high-temperature sodium, sodium-potassium alloy, lead-bismuth alloy, and lead. The simulated core heating device includes an electrode rod(100) which is installed in the molten metal and heats the molten metal with low-voltage and high-current power. Single phase AC power is applied to the electrode rod through an electric wire which is connected only to the electrode plate of the electrode rod. The exterior of the electrode rod is coated with an insulator which is protected with a protective layer not to contact the molten metal.

Description

Simulation core heater of sodium cooling high speed furnace {DEVICE FOR HEATING A SIMULATED CORE IN SODIUM COOLED FAST REACTOR SYSTEM}

The present invention relates to a simulated core heating apparatus of a sodium cooling high speed furnace, and more particularly, to a simulated core heating apparatus of a sodium cooling high speed furnace capable of directly heating molten metal in a sodium cooling high speed furnace to improve installation and heating efficiency. It is about.

Sodium cooling fast reactors, sodium handling facilities, and alkali metals including sodium (Na) (such as Li, K), sodium-potassium (Na-K) alloys, lead-bismuth (Pb-Bi) alloys, and lead (Pb) In the facility that handles the system, an electrical device acts as a simulated core to study the hydrodynamic phenomena in the reactor vessel or in a specific type of vessel.

The electric device serving as the simulated core serves to install a heater to heat the sodium contained in the container, and to control and heat the temperature of the heater. However, when a large capacity of heating is required in a narrow space, the number of heaters must be large, so that the installation of the heater is not easy and causes a problem of insufficient heating capacity. In addition, there is a problem that the heating speed of the heater is increased, and a failure of the heater may be caused when the heating temperature is high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a simulated core heating apparatus of a sodium cooling high speed furnace which is easy to install.

Another object of the present invention is to provide a simulated core heating apparatus of a sodium cooling high speed furnace having excellent heating efficiency and easy control.

It is still another object of the present invention to provide a simulated core heating apparatus for a sodium cooling high speed furnace that can be used for a long time and is easy to maintain / repair.

The simulation core heating apparatus of a sodium cooling high speed furnace for achieving the above object is an alkali metal (Li, K, etc.) containing sodium (Na) of high temperature, sodium-potassium (Na-K) alloy, lead-bismuth A simulated core heating apparatus for a sodium cooling high speed furnace using a (Pb-Bi) alloy and molten metal containing lead (Pb), wherein the molten metal is installed in the molten metal to heat the molten metal itself with a high current power source having a low voltage. It includes an electrode rod.

According to a preferred embodiment of the present invention, the electrode receives a single-phase AC power. At this time, the single-phase AC power supply may be modified in a DC converter.

The electrode is connected to a power source so as to maintain the electrode distance of the smallest distance, and the electric wire for applying power to the electrode is connected only to the electrode plate of the electrode to heat the conductor component in the molten metal. To this end, an outer circumferential surface of the electrode is wrapped by an insulator so that power is connected only to the electrode, and the insulator is protected by a protective film formed of the same or different insulating material as that of the insulator and is not in contact with the molten metal. .

For reference, the electrode rods are provided with two electrode plates respectively connected to the wires, and the electrode plates of the two electrode rods are connected to one or more wires or three wires, respectively. It is installed not to interfere with the electrode plate. In this case, at least two or six electrodes may be inserted into the upper portion of the container in which the molten metal is loaded to not interfere with the flow of the molten metal. In addition, a core support container formed of an insulator is provided to surround the electrode and the simulated core, thereby inducing a current to flow to the electrode in the shortest distance.

Alkali metal (Li, K, etc.), sodium-potassium (Na-K) alloy, lead-bismuth (Pb-Bi) alloy containing high temperature sodium (Na) according to another aspect of the present invention, and lead (Pb) The simulated core heating apparatus of the sodium cooling high speed furnace using the molten metal containing the electrode is installed in the simulated core portion of the sodium cooling high speed furnace in which the molten metal is accommodated, the electrode rod for directly heating the molten metal, and the electrode rod It includes a power supply for applying a low voltage and high current power supply. According to the present embodiment, the electrode rods are respectively provided on the upper and lower portions of the mock core and electrically connected to the first and second electrode plates through which a plurality of insertion holes through which the molten metal passes is formed, respectively. It includes two electrodes.

According to the present invention having the above configuration, firstly, alkali metal (Li, K, etc.), sodium-potassium (Na-K) alloy containing lead sodium (Na) at high temperature, and lead-bismuth (Pb-Bi) Since the molten metal with low melting point is directly heated in the reactor vessel carrying the alloy and the molten metal including lead (Pb) with an electrode to which a low voltage and high current power is applied, it is unnecessary to secure a space for installing a heater as in the prior art. Has the advantage.

Second, the installation of the electrode can be easier than the conventional heater installation can reduce the manufacturing cost.

Third, as the electrode is electrically connected to the electrode plate having a plurality of insertion holes through which the molten metal can enter and exit, the flow of the molten metal is not inhibited even when the electrode is provided.

Fourth, the heating capacity, heating time, heating temperature, heating rate and the like can be easily controlled compared to the conventional heater, and has the advantage that it can be used for a long time with the maintenance / repair cost reduction.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to Figure 1, the simulated core heating apparatus 90 according to a preferred embodiment of the present invention is an alkali metal (Li, K, etc.), sodium-potassium (Na-K) alloy containing high temperature sodium (Na) The molten metal in the simulated core 20 in which the molten metal containing the lead-bismuth (Pb-Bi) alloy and lead (Pb) is accommodated is directly heated. Here, the simulation core 20 is installed in a reactor vessel or a specific type of vessel, and in the following, the simulation core 20 employing the simulation core heating apparatus 90 according to the present embodiment is applied to the heat removal system sodium It is illustrated that it is installed in the cooling fast furnace 1.

First, the technical configuration of the sodium cooling fast reactor 1 in which the simulation core 20 is installed is as follows.

The sodium cooling fast reactor 1 is located in the lower center of the reactor vessel 10, the simulation core 20, and wraps the outer surface of the simulation core 20 and at a predetermined height to the top of the simulation core 20. An extended core support container 30 is provided. Here, the core support container 30 is formed of an insulator. At this time, the core support vessel 30 composed of the simulated core 20 and the insulator are all illustrated as being cylindrical, but may be configured in a hexagonal structure similar to the actual core. In addition, the annular separator 40 of the annular separator 40 which is vertically extended with respect to the outer surface of the core support container 30, and is disposed in a horizontal state, and extends vertically upward from the edge of the separator 40 to the reactor vessel ( A cylindrical reactor baffle 50 disposed between the inner wall of the vessel 10 and the core support vessel 30 is provided in the reactor vessel 10. Here, the reactor vessel 10 is the upper portion of the simulated core 20 and the separator 40 and the high temperature pool 11 located inside the reactor baffle 50, the lower portion and the reactor of the separator 40 The internal space is divided by the cold pool 12 located between the baffle 50 and the inner wall of the reactor vessel 100.

The height of the reactor baffle 50 is higher than the molten metal level X of the hot pool 11 in the normal operation state to prevent the high temperature sodium in the hot pool 11 from flowing into the cold pool 12. . In addition, the height of the core support vessel 30 is lower than the molten metal level X of the high temperature pool 11 so that hot molten metal is always present in the space on the outer circumferential surface side of the core support vessel 30 within the high temperature pool 11. Keep it filled.

Between the outer circumferential surface of the core support vessel 30 and the inner circumferential surface of the reactor baffle 50, a plurality of intermediate heat exchangers (IHX) 60, which are components of the normal heat removal system, are disposed according to a predetermined arrangement rule. The primary system pump 61 which pumps the molten metal of the low temperature pool 12 to the high temperature pool 11 via the simulation core 20 is arranged in accordance with a predetermined arrangement rule. Accordingly, the liquid level difference (Z) between the molten metal liquid level (X) (Y) of each of the hot pool 11 and the cold pool 12 is always above a certain level during the normal operation of the sodium cooling fast reactor 1. maintain.

Here, the intermediate heat exchanger (60) is composed of two sets, each of which is connected to a steam generator (62) located outside the reactor vessel (10) for each tank simulated core (20) during normal operation Remove heat generated from In addition, an isolation valve 64 is installed on the connection pipe 63 connecting the intermediate heat exchanger 60 and the steam generator 62 to prevent flow of the molten metal therein in the event of a failure of the normal heat removal system. It is configured to block.

In addition, a vertical circular tube 70 is installed at an edge of the high temperature pool 11 adjacent to the inner surface of the reactor baffle 50. For reference, the vertical circular tube 70 is preferably installed in about three. The vertical circular tube 70 has a lower end thereof in communication with the low temperature pool 12, so that the liquid level in the interior is equal to the liquid level Y of the low temperature pool 12 by the head of the primary system pump 61. maintain. In addition, the upper end of the vertical circular tube 70 itself extends higher than the molten metal liquid level X of the high temperature pool 11 during the normal operation of the sodium cooling fast reactor 1 as in the reactor baffle 50.

Meanwhile, a sodium-air heat exchanger 80 enters and is installed through an upper portion of the vertical circular tube 70 to be in non-contact with molten metal in the vertical circular tube 70. The sodium-air heat exchanger 80 is installed. Is penetrated through the reactor head 13 covering the top of the reactor vessel 10 and extends to the top of the reactor vessel 10 to be connected to the sodium-loop 81 for heat removal connected to the sodium-air heat exchanger 80. Accordingly, the heat absorbed through the sodium-air heat exchanger 80 in the reactor vessel 10 is discharged to the atmosphere through the sodium-air heat exchanger 80.

That is, the sodium-air heat exchanger 80 receives heat from the inlet of the lower portion of the sodium-air heat exchanger 80 and heat exchanges the heat of the high-temperature pool 11 transferred by the heat removal sodium-loop 81. It is an example of a sodium cooling fast reactor 1 in which direct heat removal using external air is discharged through an outlet 82 above the air heat exchanger 80.

Hereinafter, the simulation core heating apparatus 90 which comprises the simulation core 20 of the sodium cooling high speed furnace 1 which has the above structure is demonstrated in detail.

First, the mock core heating device 90 includes an electrode rod 100 and a power applying unit 200.

The electrode rod 100 is installed on the molten metal in the simulation core 20 to directly heat the molten metal itself with a high current power source having a low voltage. That is, the electrode 100 electrically heats a molten metal having a conductor component such as sodium (Na). These electrode rods 100 are respectively installed in the upper portion 21 and the lower portion 22 of the mock core 20 and are connected to the power supply unit 200 to be described later by a wire having a sufficient length to heat the molten metal. do. At this time, since the electrode is supported by the core support vessel 30, which is the insulator, a current may be applied in the shortest distance, and at least two or six may be provided.

Hereinafter, for convenience of description, the electrode rods 100 respectively installed on the upper portion 21 and the lower portion 22 of the simulation core 20 are referred to as first and second electrode rods 110 and 120, respectively. The wires connecting the first and second electrode rods 110 and 120 and the power applying unit 200 to be described below are referred to as first and second wires 111 and 121, respectively. Here, at least one or three or more first and second wires 111 and 121 may be provided.

In FIG. 2, the first electrode 100 provided on the simulation core 20 is illustrated in detail. Referring to FIG. 2, the first electrode rod 100 is inserted into and inserted into a plurality of first insertion holes 113 formed on the first electrode plate 112 provided on the simulation core 20. Here, the first electrode rod 100 inserted into the first insertion hole 113 of the first electrode plate 112 is provided with first and second connection wires 114 connected to the first wire 111. A first insulator 116 that insulates the first wire 111 outside the first insertion hole 113 connected to the first and second connection wires 114 and 115, and the first insulator 116 is composed of a first protective film 117 that protects the molten metal from being in contact with the molten metal. In this case, the first passivation layer 117 is formed of an insulating material that is the same as or different from that of the first insulator 116.

In this case, the first and second connection wires 114 and 115 connected to the first wire 111 are electrically connected to the first electrode plate 112 in the first insertion hole 113, thereby melting. Heat the metal. That is, the power applied from the second wire 111 is applied only to the first electrode plate 112 by the first electrode rod 110.

For reference, the first electrode plate 112 corresponds to the unheated portion in the structure of the actual simulation core 20, and the height of the non-heated portion, that is, the height H1 of the first electrode plate 112 is adjusted. It is possible. The volume or height of the first electrode 100 may be adjusted by the height H1 of the first electrode plate 112. In addition, the plurality of first insertion holes 113 may form a hydrodynamic differential pressure when a plurality of simulation cores 20 are installed to control the flow resistance of the fluid flowing between the simulation cores 20. A plurality of nozzles are formed on the first electrode plate 112 instead of the nozzles.

On the other hand, it is preferable to form a plurality of first electrode rods 100 by connecting a plurality of first wires 111 on the first electrode plate 112, but in this embodiment three first wires 111 Only three connected first electrode electrodes 100 are illustrated. In this case, it is preferable that the first electrode 110 has a structure in which a power source is connected to maintain an electrode distance of the smallest distance.

Referring to FIG. 3, the second electrode 120 provided below the simulation core 20 is shown in detail. As shown in FIG. 3, the second electrode 120 is configured to apply power applied through the second wire 121 only to the second electrode plate 122 similarly to the first electrode 100 described above. And the molten metal is heated.

To this end, the second electrode rod 120 is the third and fourth connection wirings 124 and 125 connected to the second wire 121, the second wire 121 outside the second insertion hole 123. A second insulator 126 that insulates the insulating layer, and a second passivation layer 127 formed of an insulating material that is the same as or different from the second insulator 126 to make the second insulator 126 non-contact with molten metal. The second insertion plate 123 is inserted into the second insertion hole 123 of the second electrode plate 122. In this case, the height H2 of the second electrode plate 122 corresponds to the non-heating part. For reference, the second electrode 120 is also illustrated as three, like the first electrode 100, but is not limited thereto.

With the above configuration, the first and second electrode rods 120 constitute the simulated core 20 and can directly heat the molten metal. At this time, the heating capacity, time, and speed of the first and second electrode 120 may be controlled by adjusting the power applied to the first and second electrode 110 and 120.

For reference, the first and second electrode rods 110 and 120 having the configuration as described above are inserted into the upper portion from the lower portion of the reactor vessel 10 as shown in FIG. 1 so as not to disturb the flow of molten metal. It is preferable to. In addition, even if a plurality of first and second electrode plates 112 and 122 of the first and second electrode rods 110 and 120 are provided, their wires 111 and 121 have different electrode plates 112. Naturally, it is installed so as not to interfere with the 122.

The power supply unit 200 is to apply a low voltage, high current power to the electrode 100, using a transformer 220 of the three-phase 210, the secondary side forms a single-phase AC power 230 . On the other hand, in the present embodiment, the power supply unit 200 uses the transformer 220 of the three-phase 210 and the single-phase AC power 230 to supply AC power to the first and second electrode rods 110 and 120. It will be described as passing on). However, as shown in FIG. 4, a DC converter 240 is installed between the first and second electrode rods 110 and 120 and the single-phase AC power supply 230 to supply an AC power supply having a low voltage and a high current. Of course, you can also convert to. In this case, as the power applying unit 200 applies power to the first and second electrode 120 by alternating current or direct current as shown in FIGS. 1 and 4 in consideration of the influence on the power supplied to other devices. Naturally, it is only an option that can be appropriately selected and is not limited to any one.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is a schematic view showing a simulated core heating apparatus of a sodium cooling fast reactor according to an embodiment of the present invention;

2 is a view schematically showing the upper electrode,

3 is a view schematically illustrating a lower electrode, and

4 is a configuration diagram schematically illustrating a modified example in which an electrode is applied to a power source converted by direct current (DC) converter.

<Description of the symbols for the main parts of the drawings>

1: sodium cooling reactor 10: reactor vessel

20: simulated core 90: simulated core heater

100: electrode 110: first electrode

120: second electrode 200: power supply

Claims (10)

Alkali metal containing high temperature sodium (Na) (Li, K, etc.), sodium-potassium (Na-K) alloy, lead-bismuth (Pb-Bi) alloy, molten metal containing lead (Pb) using In the simulation core heating apparatus of sodium cooling high speed furnace, An electrode rod installed in the molten metal to heat the molten metal by a high current power source having a low voltage; Simulation core heater of sodium cooling high-speed furnace comprising a. The method of claim 1, The electrode rod is simulated core heating apparatus of a sodium cooling high-speed furnace characterized in that the single-phase AC power is applied. The method of claim 1, The electrode rod is simulated core heating apparatus of a sodium cooling high-speed furnace, characterized in that the single-phase AC power is applied to the power converted to direct current by a direct current converter. The method of claim 1, The electrode is connected to a power source to maintain the electrode distance of the smallest distance, The electric wire for applying power to the electrode rod is connected to only the electrode plate of the electrode, simulated core heating apparatus of the sodium cooling high-speed furnace. The method of claim 1, The outer circumferential surface of the electrode is wrapped by an insulator so that power is connected only to the electrode, The insulator is protected by a protective film formed of the same or different insulating material than the insulator provided to surround the electrode rod, and the non-contact with the molten metal, simulated core heating apparatus of the sodium cooling high-speed furnace. The method of claim 1, The electrode bar is provided with two electrode plates each connected to the wire, The electrode plates of the two electrode rods are respectively connected to one or more or three wires, the wires connected to any one of the electrode plate is simulated core heating apparatus of sodium cooling high-speed furnace, characterized in that is installed so as not to interfere with the other electrode plate . The method of claim 1, At least two or six electrode rods are inserted into the upper portion from the lower portion of the container in which the molten metal is loaded so as not to interfere with the flow of the molten metal is provided. The method of claim 1, Simulated core heating apparatus of a sodium cooling high-speed furnace by providing a core support container formed of an insulator so as to surround the electrode and the simulated core, to induce a current to flow to the electrode in the shortest distance. Alkali metal containing high temperature sodium (Na) (Li, K, etc.), sodium-potassium (Na-K) alloy, lead-bismuth (Pb-Bi) alloy, molten metal containing lead (Pb) using In the simulation core heating apparatus of sodium cooling high speed furnace, An electrode rod installed in a simulated core portion of the sodium cooling high-speed furnace in which the molten metal is accommodated and directly heating the molten metal; And A power supply unit for applying low voltage and high current power to the electrode; Simulation core heating apparatus of sodium cooling high-speed furnace comprising a. 10. The method of claim 9, The electrode rods may include first and second electrode rods respectively provided on the upper and lower portions of the simulated core part and electrically connected to the first and second electrode plates through which a plurality of insertion holes through which the molten metal enters and exits, respectively. A simulation core heating apparatus for sodium cooling high speed furnace.

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