KR20150070873A - Leak detecting device of heat exchanger and leak detecting method thereof - Google Patents

Abstract

Disclosed are a leak detecting device of a heat exchanger and a leak detecting method thereof. The leak detecting device includes: a first flow rate sensor which is installed on a first pipe where fluid moves from a first heat exchanger to a second heat exchanger, and measures the flow rate of the fluid; a second flow rate sensor which is installed on a second pipe where the fluid moves from the second heat exchanger to the first heat exchanger, and measures the flow rate of the fluid; and a control part which detects damage on at least one of the first and second heat exchangers by using a change in the sum of flow rates or the difference in the flow rates of the fluid measured in the first and second flow rate sensors.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a leak detection apparatus and a leakage detection method for a heat exchanger,

The present invention relates to an apparatus and a method for detecting damage to a heat exchanger.

Sodium cooling The high-speed furnace uses sodium (sodium), a liquid metal, as the coolant. Sodium has a melting point of 98 degrees Celsius and a boiling point of 883 degrees. Therefore, there is little risk of explosion due to high pressure because the inside temperature of the core is about 540 degrees Celsius and the inside temperature is not boiled even at 1 atmospheric pressure.

The inside of the reactor is primarily circulated by a pump that is heated by the heat of the core and cold sodium outside the core. In addition, the sodium-cooled high-speed furnace is equipped with a passive residual heat removal system to cool the hot sodium inside the core using a natural convection phenomenon even if the power is cut off and the pump does not operate.

The passive residual heat removal system has a structure in which a sodium-sodium heat exchanger (DHX) and an external sodium-air heat exchanger (AHX, FHX) installed in a sodium cooling high-speed furnace are connected by piping. The sodium in the sodium-sodium heat exchanger warmed by the hot sodium in the core is routed through the piping to the sodium-air heat exchanger. In the sodium-air heat exchanger, cold air passes and the sodium in the piping cools down. The cooled sodium is piped back to the sodium-sodium heat exchanger to cool the sodium inside the sodium-cooled high-speed furnace. In other words, the passive remanent elimination system circulates only with the temperature difference of sodium without power, and the heat of the core is cooled.

On the other hand, when the sodium-sodium heat exchanger located in the pool of the sodium-cooled high-speed loop forming the closed loop is damaged and leakage occurs, the performance of the sodium-sodium heat exchanger deteriorates, can do.

It is an object of the present invention to provide an apparatus and a method for detecting damage to a sodium-sodium heat exchanger provided in a system for removing residual heat of a sodium-cooled high-speed furnace.

It is an object of the present invention to provide an apparatus and a method for detecting damages of a general heat exchanger as well as a sodium-sodium heat exchanger.

In order to accomplish the above object, there is provided a leak detector of a heat exchanger according to an embodiment of the present invention includes a first pipe installed in a first pipe through which a fluid moves from a first heat exchanger to a second heat exchanger, A second flow sensor installed in a second pipe through which the fluid flows from the second heat exchanger to the first heat exchanger and measuring a flow rate of the fluid; And a controller for detecting damage of at least one of the first and second heat exchangers using a change in the flow rate difference or the flow rate sum of the measured fluid.

According to an embodiment of the present invention, the control unit compares a change in the flow rate difference or the flow rate sum of the fluid with a predetermined threshold value to detect whether at least one of the first and second heat exchangers is damaged.

The control unit may transmit an alarm signal to the alarm device to notify that at least one of the first and second heat exchangers has been damaged if the change in the flow rate difference or the flow rate sum of the fluid is greater than the threshold value have.

According to another embodiment of the present invention, the first flow sensor includes: a first magnetic field forming unit that forms a magnetic field perpendicular to the first pipe; and a second magnetic field forming unit that is perpendicular to the first pipe, Wherein the second flow rate sensor comprises a second magnetic field forming unit for forming a magnetic field orthogonal to the second pipe and a second electromotive force measuring unit for measuring a second electromotive force And a measurement electrode unit.

The leakage detection device of the heat exchanger further includes a first voltage meter connected to the first electromotive force measuring electrode unit and measuring an electromotive force proportional to the flow rate of the fluid flowing through the first pipe, And a second voltage meter connected to the second pipe and measuring an electromotive force proportional to the flow rate of the fluid flowing through the second pipe.

Alternatively, the first electromotive force measuring electrode unit and the second electromotive force measuring electrode unit are continuously connected, and the leakage detection device of the heat exchanger is connected to the first electromotive force measuring electrode unit and the second electromotive force measuring electrode unit, respectively And a voltage measuring device for measuring an electromotive force proportional to a sum of the flow rates of the fluids flowing through the first and second pipes, respectively.

According to another aspect of the present invention, there is provided a method for measuring a flow rate of a fluid, comprising the steps of: measuring a flow rate of the fluid in the first pipe using a first flow rate sensor installed in a first pipe through which a fluid moves from a first heat exchanger to a second heat exchanger; 2 measuring the flow rate of the fluid in the second pipe using a second flow sensor installed in a second pipe through which the fluid moves from the heat exchanger to the first heat exchanger, Detecting a damage of at least one of the first and second heat exchangers by using a change in a flow rate difference or a flow rate sum of the fluid measured by the sensors, respectively.

According to one embodiment of the present invention, the sensing step comprises the steps of: comparing a change in the flow rate difference or the flow rate sum of the fluid with a predetermined threshold value; and if the change in the fluid flow rate difference or flow rate sum is greater than the threshold value And transmitting an alarm signal to at least one of the first and second heat exchangers to inform the alarm device that the damage has occurred.

The present invention senses whether the heat exchanger is damaged by using the flow rate difference or the flow rate change of the fluid measured by the first flow rate sensor and the second flow rate sensor, respectively. Therefore, the operation states of the first and second heat exchangers connected to form the circulation loop can be monitored at all times.

In addition, since the alarm signal is generated when the change in the flow rate difference of the fluid or the change in the flow rate sum is larger than a preset threshold value, the trouble can be dealt with promptly.

When the apparatus and method for detecting the leakage of the heat exchanger are applied to the sodium-sodium heat exchanger and the sodium-air heat exchanger provided in the passive residual heat removal system of the sodium cooling high-speed furnace, stability and operability of the sodium cooling high-speed furnace can be improved .

1 is a conceptual view for explaining a sodium cooling high-speed heat transport system;
2 is a conceptual view showing a system for removing residual heat of a sodium-cooled high-speed furnace according to an embodiment of the present invention;
3 is a flow chart illustrating a method of detecting leaks in the sodium-sodium heat exchanger shown in FIG. 2;
4 is a conceptual diagram showing an example of a leak detection device using an electronic flow meter.
5A to 5D are graphs showing signals obtained through the leak detection apparatus of FIG.
6 is a conceptual diagram showing another example of a leak detection device using an electronic flow meter.
FIGS. 7A and 7B are graphs showing signals obtained through the leak detection apparatus of FIG. 6;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a leakage detecting apparatus and method of a heat exchanger according to the present invention will be described in detail with reference to the drawings.

In describing the present invention, a detailed description of well-known functions or constructions may be omitted for clarity of the present invention. Furthermore, the singular < RTI ID = 0.0 > terms < / RTI > used herein include plural referents unless the context clearly dictates otherwise.

Hereinafter, the leak detecting apparatus of a heat exchanger of the present invention is applied to a sodium-sodium heat exchanger and a sodium-air heat exchanger provided in a drift residual heat eliminating system in a sodium-cooled high-speed furnace. However, the present invention is not necessarily limited to these examples. The leakage detector of the heat exchanger of the present invention may be installed in a general heat exchanger and may be configured to monitor the operation state at any time.

1 is a conceptual diagram for illustrating a sodium cooling high-speed heat transport system.

Referring to FIG. 1, during normal operation, sodium in the PHTS is heated from the core to a high temperature, flows into the high temperature pool, passes through the IHX and transfers the heat of the PHTS to the IHTS. IHX, the cooled sodium is collected in the low-temperature pool, and then flows into the core through the PHTS pump and flows back to the core, hot pool, IHX shell side, low temperature pool, PHTS pump, PHTS pump discharge piping and core inlet plenum inlet plenum) to form a circulating flow path of the internal sodium pool.

The Intermediate Heat Exchanger (IHX) is a heat exchanger that transfers heat from PHTS sodium to IHTS sodium, a physical barrier that isolates radioactive sodium PHTS from non-radioactive IHTS sodium and isolates radioactive sodium inside the containment boundary Function.

The IHX is a cylindrical form consisting of tubes for heat transfer between the PHTS and IHTS and piping for the flow of IHTS sodium. The upper tube sheet is fixed to the barrel of the IHX to maintain the integrity of the structure by the flow distribution and thermal stress of the IHX, but the lower tube sheet has a design feature that is supported by the tube itself in a floating form.

The PHTS sodium flows down through the IHX shell side and the cold IHTS sodium introduced through the central piping is a counter-current flow heat exchange method that flows upward through the inside of the heat transfer tube. The PHTS sodium flows through the IHX inlet nozzle directly below the upper tube sheet of the IHX in the hot pool, then flows downward through the bundle of heat transfer tubes and is discharged to the low temperature pool through the IHX discharge nozzle. As a result of this flow, the pressure loss on the shell side of the IHX appears as the difference in the liquid level between the low and high temperature pools during normal operation.

The removal of residual heat from the sodium-cooled high-speed furnace is accomplished through the condensation cooling of the steam generating system (SGS), the active decay heat removal system (ADHRS), and the passive decay heat removal system (PDHRS). PHTS, IHTS, and SGS Note The normal heat removal path consisting of condenser cooling is used in the normal output operation mode and the plant shutdown from the output operation to the reloading mode. If the normal heat transfer path can not be used due to clogging of the heat transfer pipe of the intermediate heat exchanger or damage or maintenance / repair of the steam generator water supply system, the system can be cooled to a safe state without exceeding the temperature limit of the core and sodium coolant pressure boundary Appropriate emergency core residual heat removal methods should be provided. Among these residual heat removal systems, SGS and ADHRS are active systems, and PDHRS is a passive residual heat removal system, which is designed to provide a reliable emergency residual heat removal means without operator intervention.

The DHS (Decay Heat Removal System) should ensure a stable performance to remove heat from the sodium-cooled high-speed furnace into the atmosphere due to the final heat sink, regardless of any type of design basis accident during the lifetime of the plant. The safety grade demagnetization system is divided into ADHRS and PDHRS and consists of four independent heat rejection loops (two PDHRS loops and two ADHRS loops) for diversity and redundancy. do.

The sodium-cooled sodium-to-sodium decay heat exchanger (DHX) is installed in the sodium-cooled high-speed furnace for primary system heat removal with core residual heat, It is a concept that the heat of the system is released to the atmosphere due to the final heat sink using a connected sodium-air heat exchanger. Since the activated sodium of PHTS performs heat exchange in the physically separated state of sodium of ADHRS and PDHRS loops which are not sodium spinnot released by DHX, even if sodium heat transfer tube defects occur in the sodium-air heat exchanger, Radiation leakage can be prevented at the source.

Since the air-side convection heat resistance of the sodium-air heat exchanger shell side on a series of heat removal paths leading from the pool to the atmosphere at sodium cooling high speed accounts for more than 97% of the total heat transfer resistance, the performance of the sodium- It is an important factor in determining overall residual heat removal system performance. Therefore, the residual heat removal system of the sodium cooling high-speed furnace introduces different types of sodium-air heat exchangers in the active and passive residual heat removal systems for diversity and multiplicity. The active ADHRS system uses a forced-draft sodium-to-air heat exchanger (FHX), which uses an intuitive sintered sodium tube with a fin to perform forced draft cooling using an air blower. On the other hand, in the case of the passive type PDHRS, air cooling by natural ventilation is performed without using active devices, so that the concept of AHX (sodium- to-Air Heat Exchanger to maximize heat transfer area without fin.

The sodium-sodium residual heat exchanger (DHX) removes the residual heat from the sodium-air heat exchanger (AHX, FHX) installed at the top of the building at high speed by sodium cooling the heat accumulated in the PHTS sodium pool by the generation of core residual heat after stopping at the sodium cooling high- Sodium loop, and also performs a barrier function to prevent the sodium of the radioactive PHTS from leaking out of the residual heat eliminating sodium loop or the storage system. Therefore, it is very important to maintain soundness of DHX tube in case of unexpected sodium leakage in sodium-air heat exchanger tube.

DHX, a shell-and-tube type heat exchanger, is placed in a low temperature sodium pool at a sodium cooling rate. PHTS Sodium is flowed downward through the DHX shell side and the low-temperature residual heat removal loop introduced through the sodium downflow pipe at the center of DHX. Sodium is counter-flowed upward through the inside of the heat transfer tube, current flow type heat exchanger. The sodium in the upper part of the low-temperature pool flows through the DHX inlet nozzle immediately below the upper tube sheet of DHX, then flows downward through the bundle of DHX tubes, and the cooled PHTS sodium through the DHX is located in the lower part of the DHX And discharged through the outlet nozzle to the low-temperature sodium pool sub-region.

Heat observation Sodium was connected to the cold-leg of the residual heat elimination loop and flowed into a DHX lower sodium chamber through a cold sodium downcomer located at the center of the heat exchanger. DHX And is designed to be distributed to each of the sodium heat pipes through the lower tube sheet. At this time, the central downward flow pipe of the DHX was designed as a double pipe to prevent the downward sodium on the heat transfer pipe side from being heated by the hot side sodium on the shell before being introduced into the DHX lower sodium chamber. In this case, compared to the case of using a single tube, the gas layer between the double tubes reduces the heat flux from the hot sodium to the downflow channel on the DHX shell side, thereby suppressing the temperature rise of the sodium introduced into the DHX lower sodium chamber.

The low-temperature sodium introduced into each heat transfer pipe is a structure that performs counter-current flow heat exchange with PHTS hot sodium while flowing vertically upward along the inside of the straight pipe. The sodium heated in the DHX tube is collected again in the co-axial part sodium chamber of the DHX and circulated to the sodium-air heat exchanger through the hot-leg of the residual heat removal loop, Loop high-temperature tube → sodium-air heat exchanger → residual heat elimination loop Low-temperature tube → DHX to form a pulsating circulation flow path to release the heat of the system into the atmosphere.

Hereinafter, an apparatus and method for detecting a damage of a sodium-sodium heat exchanger provided in a drift residual heat removal system of a sodium-cooled high-speed furnace will be described.

2 is a conceptual diagram showing a drift residual heat removal system 100 of a sodium-cooled high-speed furnace 10 according to an embodiment of the present invention.

In the sodium-cooled high-speed furnace 10, sodium (H) heated by the heat of the core 11 and cold sodium (C) outside the core 11 are primarily circulated by the pump 12. In the sodium-cooled high-speed furnace 10, a driven residual heat elimination system 100 is provided so that hot sodium (H) inside the core 11 is removed by natural convection even when the pump 12 is not operated, As shown in FIG.

The passive residual heat removal system 100 includes a sodium-sodium heat exchanger (DHX) 13 installed inside the sodium-cooled high-speed furnace 10 and an externally installed sodium-air heat exchanger [AHX 110, FHX] And has a connected structure. In this figure, a natural sodium-air heat exchanger 110 is connected to a sodium-sodium heat exchanger 13. However, the present invention is not limited thereto. As shown in FIG. 1, the passive residual heat eliminating system 100 includes a natural cooling sodium-air heat exchanger 110 and a forced circulating sodium-air heat exchanger And a forced circulation sodium-air heat exchanger (FHX).

The sodium of the sodium-sodium heat exchanger 13 warmed by the hot sodium in the core 11 is transferred to the sodium-air heat exchanger 110 via the pipe. In the sodium-air heat exchanger (110), cold air passes and the sodium in the pipe cools down. The cooled sodium is again piped back to the sodium-sodium heat exchanger (13) to cool the sodium inside the sodium-cooled high-speed furnace (10).

As such, the driven residual heat removal system 100 is a cooling system that infinitely circulates with only the temperature difference of sodium without power.

The sodium-air heat exchanger (110) includes an outer chamber (111) and an inner chamber (112).

The outer chamber 111 contains an inner chamber 112 and an air inlet and an air outlet, respectively, through which the outside air for cooling the sodium flows in and out.

The inner chamber 112 has a heat transfer tube tube through which sodium flows. A tube sheet for supporting the heat transfer tube may be additionally provided between the upper portion and the lower portion of the chamber. In the case of a forced circulation sodium-air heat exchanger (FHX), a fin for forced air inflow may be additionally provided.

On the other hand, since a part of the sodium-sodium heat exchanger 13 is submerged in the sodium pool of the sodium-cooled high-speed furnace 10, it is difficult to grasp the internal damage. If the internal damage of the sodium-sodium heat exchanger 13 occurs, the performance of the passive residual heat removal system 100 described above is degraded. In addition, there is a great risk if not quickly responding to the internal damage.

Hereinafter, an apparatus and method for monitoring whether the driven residual heat elimination system 100 is operating normally will be described in more detail.

FIG. 3 is a flow chart illustrating a method of detecting leaks in the sodium-sodium heat exchanger 13 shown in FIG.

2, the leakage sensing device 120 of the sodium-sodium heat exchanger 13 includes a first flow sensor 121, a second flow sensor 122, and a controller 124 (see FIG. 4) ). The leakage sensing device 120 is configured to continuously monitor whether the driven residual heat eliminating system 100 is operating normally through the steps described below (S310).

The first flow sensor 121 is installed in a first pipe 101 through which the sodium is transferred from the sodium-sodium heat exchanger 13 to the sodium-air heat exchanger 110 to measure the flow rate S 1 of the sodium (S320).

The second flow sensor 122 is installed in the second pipe 102 where sodium is moved from the sodium-air heat exchanger 110 to the sodium-sodium heat exchanger 13 to measure the flow rate S2 of sodium (S330).

When the first pipe 101 and the second pipe 102 are arranged side by side, the directions of flow of sodium may be opposite to each other.

The first and second flow sensors 121 and 122 may be an electromagnetic flowmeter applying an electromagnetic induction law, an ultrasonic flowmeter using ultrasonic waves, a volumetric flowmeter for measuring the volume or mass of a unit time, .

The control unit 124 obtains the flow rate difference (S3 = S1-S2, S3 = S2-S1) or the flow rate sum (S3 = S1 + S2) of the sodium measured by the first and second flow sensors 121 and 122 The sodium-sodium heat exchanger 13 and the sodium-air heat exchanger 110 are damaged using the change (differential value, D1) (S350).

Since the sodium-air heat exchanger 110 is disposed outside the sodium-cooled high-speed furnace 10, it can be relatively easily grasped whether or not the sodium-air heat exchanger 110 is damaged. However, It is difficult to understand whether it is damaged because it is locked in the grass. Therefore, the present invention can be usefully used for detecting whether or not the sodium-sodium heat exchanger 13 is damaged.

Specifically, the control unit 124 compares the sodium-sodium heat exchanger 13 and the sodium-air heat exchanger 110 with each other by comparing the change (D1) of the flow rate difference or the flow rate sum of sodium with the predetermined threshold value TH1 (Step S360). The threshold value TH1 is a maximum value of the change D1 when the passive residual heat removal system 100 is operating normally. If the change D1 exceeds the threshold value TH1, It may be a measure for determining that there is a problem in the operation of the apparatus 100.

The control unit 124 may control the amount of leaks in at least one of the sodium-sodium heat exchanger 13 and the sodium-air heat exchanger 110 if the flow rate difference or the flow rate change D1 of the sodium flow rate is greater than the threshold value TH1 ), That is, to transmit an alarm signal indicating that the damage has occurred to the alarm device 125 (see FIG. 4) (S370). For example, when damage occurs in the sodium-sodium heat exchanger 13, the peak value of the change in the flow rate of sodium or the change in the flow rate sum (D1) curve exceeds the threshold value TH1. In this case, the alarm device 125 may be configured to receive an alarm signal from the control unit 124 and generate an alarm so that an operator can quickly respond to the alarm signal.

On the contrary, if the flow rate difference or the flow rate change D1 of the fluid is smaller than the threshold value TH1, the controller 124 determines that the driven residual heat elimination system 100 is operating normally. The control unit 124 controls the flow rates S 1 and S 2 of the sodium flowing through the first and second pipes 101 and 102 obtained from the first and second flow sensors 121 and 122, (D1) of the difference (S3 = S1-S2, S3 = S2-S1) or the flow sum (S3 = S1 + S2).

Hereinafter, a case where the first and second flow sensors 121 and 122 are constituted by an electromagnetic flow meter will be described in more detail as an example.

FIG. 4 is a conceptual diagram illustrating an example of a leakage sensing device 120 using an electromagnetic flow meter, and FIGS. 5A to 5D are graphs showing signals obtained through the leakage sensing device 120 of FIG.

Referring to FIG. 4, the first flow sensor 121 includes a first magnetic field forming portion 121a and a first electromotive force measuring electrode portion 121b. The first magnetic field forming portion 121a forms a magnetic field orthogonal to the first pipe 101 and the first electromotive force measuring electrode portion 121b is perpendicular to the first pipe 101 so as to be perpendicular to the magnetic field.

According to the above structure, when conductive sodium flows in the first pipe 101 in a state where a magnetic field perpendicular to the first pipe 101 as a non-magnetic pipe is formed, the first electromotive force measuring electrode part 121b An electromotive force proportional to the flow rate of sodium is generated. When the electromotive force is measured, the flow rate S 1 of sodium can be calculated.

Similarly, the second flow sensor 122 includes a second magnetic field forming portion 122a and a second electromotive force measuring electrode portion 122b. The second magnetic field forming portion 122a forms a magnetic field orthogonal to the second pipe 102 and the second electromotive force measuring electrode portion 122b is perpendicular to the second pipe 102 so as to be orthogonal to the magnetic field.

The leak detector 120 of the heat exchanger may further include a data collection device 123 having a first voltage meter 123a and a second voltage meter 123b.

The first voltage meter 123a is connected to the first electromotive force measuring electrode part 121b to measure electromotive force proportional to the flow rate of sodium flowing through the first pipe 101. [ The second voltage meter 123b is connected to the second electromotive force measuring electrode unit 122b to measure an electromotive force proportional to the flow rate of sodium flowing through the second pipe 102. [ That is, the flow rates S1 and S2 of sodium flowing through the first and second pipes 101 and 102, respectively, can be obtained by the first and second voltage meters 123a and 123b.

5A shows the flow rate S 1 of sodium flowing through the first pipe 101 obtained through the first flow sensor 121 and FIG 5B shows the flow rate S 1 of the second pipe 102 obtained through the second flow sensor 122 ) Of sodium (S2) flowing through the column.

The control unit 124 may include a differential calculator 124a and a discriminator 124b.

The differential calculator 124a calculates the flow rate difference (S3 = S1-S2, S3 = S2-S1) or the flow rate sum (S3 = S1 + S2) of the sodium flowing through the first and second pipes 101 and 102, And calculates its change D1. 5C and 5D, the differential calculator 124a calculates the difference (S3 = S1-S2) of the flow rate of sodium flowing through the first and second pipes 101 and 102 and then graphs the differential D1 have.

In the differential graph showing the difference in flow rate or the sum of flow rate of sodium obtained by this method, the flow rate change of sodium appears as a peak-shaped signal. If the peak value of the differential curve is higher than the predetermined threshold value TH1, the discriminator 124b generates an alarm informing that at least one of the sodium-sodium heat exchanger 13 and the sodium-air heat exchanger 110 has been damaged Signal to the alerting device 125.

FIG. 6 is a conceptual diagram showing another example of the leakage sensing device 220 using an electromagnetic flow meter, and FIGS. 7A and 7B are graphs showing signals obtained through the leakage sensing device 220 of FIG. In the present embodiment, the same or similar reference numerals are given to similar or similar components to those of the previous embodiment, and the description thereof is replaced with the first explanation.

6, 7A and 7B, the first electromotive force measuring electrode part 221b and the second electromotive force measuring electrode part 222b are continuously connected.

In addition, the leakage detection device 220 of the heat exchanger may further include a data collection device 223 having a voltage meter 223a. The voltage meter 223a is connected to the first electromotive force measuring electrode portion 221b and the second electromotive force measuring electrode portion 222b and is proportional to the sum of the flow rates of sodium flowing through the first and second pipes 201 and 202, To measure the electromotive force.

That is, in order to obtain the flow rates S 1 and S 2 of the sodium flowing through the first and second pipes 101 and 102, respectively, first and second voltages V 1 and V 2 corresponding to the first and second pipes 101 and 102, The voltage measuring device 223a is connected to the first and second electromotive force measuring electrode parts 221b and 222b and is connected to the first and second piping parts 221a and 222b in the present embodiment, unlike the previous embodiment in which the measuring devices 123a and 123b are provided. (S 3 = S 1 + S 2) of the flow of sodium flowing through the flow paths 201, 202.

7A and 7B, the sum (S3 = S1 + S2) of the flow rates of sodium flowing through the first and second pipes 201 and 202 can be obtained by the voltage meter 223a The flow rate of sodium S 1 flowing through the first pipe 201 obtained through the flow sensor 221 and the flow rate S 2 of the sodium flowing through the second pipe 202 obtained through the second flow sensor 222 The same as in the previous embodiment).

As described above, the control unit 224 obtains the sum of flow (or flow rate difference) of sodium by using the differential calculator 224a, and calculates the sum of the sodium-sodium heat exchanger 13 and the sodium - determine whether a damage has occurred to at least one of the air heat exchangers (110).

According to the present embodiment, the flow rate S1 of sodium flowing through the first pipe 201 obtained through the first flow sensor 221 and the flow rate S1 of the second pipe 202 obtained through the second flow sensor 222 It is not possible to measure the flow rate of the flowing sodium (S2), but it is considered that this is a process for obtaining a difference in flow rate of sodium (S3 = S1-S2, S3 = S2-S1) or sum of flows (S3 = S1 + S2) There is an advantage that the structure of the data collection device 123 can be further simplified.

As described above, the present invention senses whether the heat exchanger is damaged by using the flow rate difference or the flow rate change of the fluid measured by the first flow rate sensor and the second flow rate sensor, respectively. Therefore, the operation states of the first and second heat exchangers connected to form the circulation loop can be monitored at all times.

In addition, since the alarm signal is generated when the change in the flow rate difference of the fluid or the change in the flow rate sum is larger than a preset threshold value, the trouble can be dealt with promptly.

When such a leakage detecting device and method of this heat exchanger is applied to the sodium-sodium heat exchanger 13 and the sodium-air heat exchanger 110 provided in the drift residual heat removal system 100 of the sodium cooling high-speed furnace 10, The stability and the drivability of the sodium-cooled high-speed furnace 10 can be improved.

The leakage detecting apparatus and method of the heat exchanger described above are not limited to the method and configuration of the embodiment described above. The present invention can be variously modified and modified within the scope of the technical idea. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: sodium-cooled high-speed furnace 11: core
12: Pump 13: Sodium-sodium heat exchanger
14: intermediate heat exchanger 15: UIS
100: driven residual heat removal system 101: first piping
102: second piping 110: sodium-air heat exchanger
111: outer chamber 112: inner chamber
120: leak detection device 121: first flow sensor
121a: first magnetic field forming section 121b: first electromotive force measuring electrode section
122: second flow sensor 122a: second magnetic field forming section
122b: second electromotive force measuring electrode part 123: data collecting device
123a: first voltage meter 123b: second voltage meter
124: control unit 124a: differential calculator
124b: discriminator 125: alarm device

Claims (8)

A first flow sensor installed in a first pipe through which the fluid flows from the first heat exchanger to the second heat exchanger, the first flow sensor measuring the flow rate of the fluid;
A second flow sensor installed in a second pipe through which the fluid moves from the second heat exchanger to the first heat exchanger and measuring a flow rate of the fluid; And
And a controller for detecting damage of at least one of the first and second heat exchangers using a change in a flow rate difference or a flow rate sum of the fluid measured by the first and second flow rate sensors, Device. The method according to claim 1,
Wherein,
And comparing a change in the flow rate difference or the flow rate sum of the fluid with a predetermined threshold value to detect whether at least one of the first and second heat exchangers is damaged. 3. The method of claim 2,
Wherein,
Wherein an alarm signal indicating that damage has occurred to at least one of the first and second heat exchangers is transmitted to the alarm device if the change in the flow rate difference or the flow rate sum of the fluid is greater than the threshold value A leak detector of a heat exchanger. The method according to claim 1,
Wherein the first flow rate sensor comprises:
A first magnetic field forming unit forming a magnetic field orthogonal to the first pipe; And
And a first electromotive force measuring electrode unit installed perpendicular to the first pipe so as to be orthogonal to the magnetic field,
Wherein the second flow rate sensor comprises:
A second magnetic field forming unit forming a magnetic field orthogonal to the second pipe; And
And a second electromotive force measuring electrode unit installed perpendicular to the second pipe so as to be orthogonal to the magnetic field. 5. The method of claim 4,
A first voltage meter connected to the first electromotive force measuring electrode unit and measuring an electromotive force proportional to a flow rate of the fluid flowing through the first pipe; a second voltage meter connected to the second electromotive force measuring electrode unit, And a second voltage meter for measuring an electromotive force proportional to the flow rate of the fluid. 5. The method of claim 4,
The first electromotive force measuring electrode unit and the second electromotive force measuring electrode unit are continuously connected,
And a voltage measuring unit connected to the first and second electromotive force measuring electrode units and measuring a electromotive force proportional to a sum of a flow rate of the fluid flowing through the first and second pipes, Further comprising: a leakage sensor for detecting the temperature of the heat exchanger. Measuring a flow rate of the fluid in the first pipe using a first flow sensor installed in a first pipe through which fluid flows from the first heat exchanger to the second heat exchanger;
Measuring a flow rate of the fluid in the second pipe using a second flow sensor installed in a second pipe in which the fluid moves from the second heat exchanger to the first heat exchanger; And
Detecting a damage of at least one of the first and second heat exchangers using a change in a flow rate difference or a flow rate sum of the fluid measured by the first and second flow rate sensors, Way. 8. The method of claim 7,
Wherein the sensing comprises:
Comparing a change in the flow rate difference or the flow rate sum of the fluid with a predetermined threshold value; And
And delivering an alarm signal to the alarm device indicating that damage has occurred to at least one of the first and second heat exchangers if the change in flow rate difference or flow sum of the fluid is greater than the threshold value A method of detecting leakage of a heat exchanger.

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