A high-temperature and high-pressure water-water non-active residual heat exchanger thermal test device and method placed in a cooling water tank

Abstract

This invention provides a thermal testing apparatus and method for a high-temperature, high-pressure water-to-water passive residual heat exchanger placed in a cooling water tank. The apparatus includes: a passive residual heat exchanger, a hot water circulating pump, an electric heater, a loop makeup water pump, a water tank cooling pump, a cooling water tank cooler, a nitrogen pressure regulator, a loop makeup water tank, a multi-functional auxiliary test water tank, a first check valve, a first electrically operated shut-off valve, a first electrically operated regulating valve, a second check valve, a second electrically operated shut-off valve, a third electrically operated shut-off valve, a third check valve, a second electrically operated regulating valve, a fourth electrically operated shut-off valve, a bypass regulating valve, a sixth electrically operated shut-off valve, a first flow meter, a second flow meter, a third flow meter, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, a seventh electrically operated shut-off valve, an eighth electrically operated shut-off valve, and a cooling water tank. This technical solution can conveniently simulate the actual operating conditions of a passive residual heat exchanger, achieving stable control of low-flow conditions on the hot side and control of steady-state temperature conditions on the cold side.

Description

Technical Field

[0001] This application relates to the field of marine power technology, and in particular to a thermal testing apparatus and method for a high-temperature and high-pressure water-to-water passive residual heat exchanger placed in a cooling water tank. Background Technology

[0002] In the field of marine propulsion, the role of a passive waste heat removal system is to remove the decay heat of the reactor to the final heat sink through natural circulation when the entire ship loses power. In a typical design, the hot side of the passive waste heat removal heat exchanger is high-temperature, high-pressure water, and the cold side is water in a cooling water tank. For this type of high-temperature, high-pressure water-to-water passive waste heat removal heat exchanger placed in a cooling water tank, its thermal performance testing differs from that of conventional heat exchangers mainly in the following ways:

[0003] (1) For conventional heat exchangers, the hot and cold side temperatures, flow rates, and other parameters are basically stable during operation, and these stable test conditions are used during thermal tests. For passive waste heat removal heat exchangers, the hot and cold side temperatures, flow rates, and other parameters change continuously with the shutdown time, seawater temperature, and other conditions during operation. Therefore, one or more typical operating conditions need to be proposed during the design process.

[0004] (2) The passive exhaust heat exchanger placed in the cooling water tank does not have the concept of the shell side of the conventional heat exchanger, so it is necessary to simulate the temperature conditions in the cooling water tank.

[0005] (3) Since its principle is natural circulation heat exchange, the flow rate of the hot side and the cold side of the passive exhaust heat exchanger is relatively low when it is running. It is difficult to adjust the parameters required for the test by directly using the regulating valve.

[0006] (4) It is necessary to maximize the versatility of the passive exhaust heat exchanger test system so that the test system can be easily applied to other water-to-water natural circulation heat exchangers. Summary of the Invention

[0007] To address the need for thermal performance testing of high-temperature, high-pressure water-to-water passive waste heat removal heat exchangers placed in a cooling water tank, this invention proposes a thermal performance testing scheme for such heat exchangers placed in a cooling water tank. This scheme can conveniently simulate the actual operating conditions of passive waste heat exchangers, achieve stable control of low-flow conditions on the hot side, and control of steady-state temperature conditions on the cold side.

[0008] This invention provides a thermal testing apparatus for a high-temperature, high-pressure water-to-water passive exhaust heat exchanger placed in a cooling water tank. The testing apparatus includes:

[0009] 1. Passive exhaust heat exchanger; 2. Hot water circulation pump; 3. Electric heater; 4. Loop water supply pump; 5. Water tank cooling pump; 6. Cooling water tank cooler; 7. Nitrogen pressure regulator; 8. Loop water supply tank; 9. Multifunctional test auxiliary water tank; 10. First check valve; 11. First electric shut-off valve; 12. First electric regulating valve; 13. Second electric shut-off valve; 14. Third electric shut-off valve; 15. Third check valve; 16. Second electric regulating valve; 17. Fourth electric shut-off valve; 18. Bypass regulating valve; 19. Sixth electric shut-off valve; 20. First flow meter; 21. Second flow meter; 22. Third flow meter; 23. First temperature sensor; 24. Second temperature sensor; 25. Third temperature sensor; 26. Fourth temperature sensor; 27. Fifth temperature sensor; 28. Seventh electric shut-off valve; 30. Eighth electric shut-off valve; and 31. Cooling water tank; 29.

[0010] The cooling water tank 29 is used to contain cooling liquid. The passive residual heat exchanger 1 is installed in the cooling water tank 29. The output end of the passive residual heat exchanger 1, the third electric shut-off valve 15, the hot water circulation pump 2, the first check valve 10, the first electric shut-off valve 11, the electric heater 3, the eighth electric shut-off valve 31, the first electric regulating valve 12, the first flow meter 21, the second flow meter 22, the seventh electric shut-off valve 30, and the input end of the passive residual heat exchanger 1 are connected in sequence through pipelines. The first temperature sensor 24 and the second temperature sensor 25 are correspondingly connected to the pipelines at the output end and the input end of the passive residual heat exchanger 1.

[0011] The loop water supply tank 8 is connected to the first flow meter 21 and the second flow meter 22 via the loop water supply pump 4, the second check valve 13, and the second electric shut-off valve 14 in sequence.

[0012] The nitrogen pressure regulator 7 is connected to the first flow meter 21 and the second flow meter 22 via the sixth electric shut-off valve 20;

[0013] A bypass pipeline with a bypass regulating valve 19 is provided between the third electric shut-off valve 15 and the hot water circulation pump 2 and between the first flow meter 21 and the second flow meter 22.

[0014] The cooling water tank cooler 7 is installed inside the cooling water tank 29 and is used to cool the cooling liquid contained in the cooling water tank 29. The output end of the cooling water tank cooler 7, the fourth electric shut-off valve 18, the third flow meter 23, the multi-functional test auxiliary water tank 9, the water tank cooling pump 5, the third check valve 16, the second electric regulating valve 17, and the input end of the cooling water tank cooler 7 are connected in sequence through pipelines. The fifth temperature sensor 28 and the fourth temperature sensor 27 are correspondingly connected to the pipelines at the output end and the input end of the cooling water tank cooler 7.

[0015] The cooling water tank 29 is connected to the third temperature sensor 26 for detecting the temperature of the cooling liquid contained in the cooling water tank 29.

[0016] In some embodiments, the rated heat exchange capacity of the electric heater 3 is greater than twice the rated heat exchange capacity of the passive exhaust heat exchanger 1.

[0017] In some embodiments, the rated heat exchange capacity of the cooling water tank cooler 7 is greater than the rated heat exchange capacity of the passive exhaust heat exchanger 1.

[0018] This invention provides a test method based on the thermal test apparatus for a high-temperature, high-pressure water-to-water passive residual heat exchanger placed in a cooling water tank as described in any of the above embodiments. The method includes:

[0019] During the test and evaluation of the passive residual exhaust heat exchanger 1, the commissioning is first carried out in a cold state. The first electric shut-off valve 11, the third electric shut-off valve 15, and the sixth electric shut-off valve 20 are opened, the opening of the first electric regulating valve 12 and the bypass regulating valve 19 are increased, the hot water circulation pump 2 is started, and the flow rate through the passive residual exhaust heat exchanger 1 is adjusted to near the hot side flow rate specified in the test and evaluation conditions of the passive residual exhaust heat exchanger 1 by pressurizing the nitrogen pressure regulator 7 and starting the circuit water supply pump 4, and by adjusting the opening of the first electric regulating valve 12 and the bypass regulating valve 19.

[0020] Open the fourth electric shut-off valve 18, start the water tank cooling pump 5, and adjust the flow rate in the cooling water tank cooler 7 to near the calculated value by adjusting the second electric regulating valve 17.

[0021] After the cold-state commissioning is completed, the electric heater 3 is started, and the power is adjusted to the rated heat exchange capacity of the heat exchanger specified in the test conditions of the passive residual exhaust heat exchanger 1 by adjusting the power. The hot side temperature of the passive residual exhaust heat exchanger 1 is gradually increased. When the second temperature sensor 25 reaches the hot side temperature of the heat exchanger specified in the test conditions of the passive residual exhaust heat exchanger 1, the temperature in the cooling water tank 29 is adjusted to the cold side medium temperature specified in the test conditions of the passive residual exhaust heat exchanger 1 by adjusting the opening of the second electric regulating valve 17.

[0022] When the parameters of the second temperature sensor 25 and the third temperature sensor 26 are stable, the system basically reaches the test conditions specified by the passive exhaust heat exchanger 1. At this time, the required test parameters are obtained through the second flow meter 22, the first temperature sensor 24, the second temperature sensor 25, and the third temperature sensor 26, and the heat exchange power of the passive exhaust heat exchanger 1 is calculated.

[0023] The beneficial effects of the above embodiments of the present invention include:

[0024] The thermal testing scheme for a passive water-to-water heat exchanger placed in a cooling water tank, as proposed in the above embodiments of the present invention, features a simple hot-side test loop principle, quick setup, and high reusability. The combined adjustment of the regulating valve and bypass system allows for convenient regulation of low-flow conditions on the hot side. Furthermore, by installing the heat exchanger within the cooling water tank, the temperature of the medium on the cold side of the heat exchanger can be easily controlled and adjusted. Attached Figure Description

[0025] The accompanying drawings illustrate, by way of example and not limitation, the various embodiments discussed herein.

[0026] Figure 1 This is a schematic diagram of the thermal test device for a high-temperature and high-pressure water-to-water passive residual heat exchanger placed in a cooling water tank, according to an embodiment of the present invention.

[0027] Symbol explanation:

[0028] 1- Passive exhaust heat exchanger, 2- Hot water circulation pump, 3- Electric heater, 4- Loop makeup water pump, 5- Water tank cooling pump, 6- Cooling water tank cooler, 7- Nitrogen pressure regulator, 8- Loop makeup water tank, 9- Multifunctional test auxiliary water tank, 10- First check valve, 11- First electric shut-off valve, 12- First electric regulating valve, 13- Second check valve, 14- Second electric shut-off valve, 15- Third electric shut-off valve, 16- Third check valve, 17- Second electric regulating valve, 18- Fourth electric shut-off valve, 19- Bypass regulating valve, 20- Sixth electric shut-off valve, 21- First flow meter, 22- Second flow meter, 23- Third flow meter, 24- First temperature sensor, 25- Second temperature sensor, 26- Third temperature sensor, 27- Fourth temperature sensor, 28- Fifth temperature sensor, 29- Cooling water tank, 30- Seventh electric shut-off valve, 31- Eighth electric shut-off valve. Detailed Implementation

[0029] In order to gain a more detailed understanding of the features and technical content of the embodiments of this application, the implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this application.

[0030] In the embodiments described in this application, it should be noted that, unless otherwise stated and limited, the term "connection" should be interpreted broadly. For example, it can be an electrical connection, or a connection between two internal components. It can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above term according to the specific circumstances.

[0031] It should be noted that the terms "first," "second," and "third" used in the embodiments of this application are merely used to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first," "second," and "third" can be interchanged in a specific order or sequence where permitted. It should be understood that the objects distinguished by "first," "second," and "third" can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in an order other than those illustrated or described herein.

[0032] This invention patent belongs to the field of marine power technology, specifically relating to a thermal test scheme for a high-temperature and high-pressure water-to-water passive residual exhaust heat exchanger placed in a cooling water tank. It can be applied to the thermal-hydraulic test of a high-temperature and high-pressure water-to-water passive residual exhaust heat exchanger placed in a cooling water tank, and can be used as a reference for the thermal-hydraulic test of other types of water-to-water circulating natural circulation heat exchangers.

[0033] The following is in conjunction with the appendix Figure 1 The embodiments of the present invention will be described in detail below. Figure 1This is a schematic diagram of the thermal test device for a high-temperature and high-pressure water-to-water passive residual heat exchanger placed in a cooling water tank, according to an embodiment of the present invention.

[0034] This invention provides a thermal testing apparatus for a high-temperature, high-pressure water-to-water passive residual heat exchanger placed in a cooling water tank, such as... Figure 1 As shown, the test apparatus includes:

[0035] 1. Passive exhaust heat exchanger; 2. Hot water circulation pump; 3. Electric heater; 4. Loop makeup water pump; 5. Water tank cooling pump; 6. Cooling water tank cooler; 7. Nitrogen pressure regulator; 8. Loop makeup water tank; 9. Multifunctional test auxiliary water tank; 10. First check valve; 11. First electric shut-off valve; 12. First electric regulating valve; 13. Second electric shut-off valve; 14. Third electric shut-off valve; 15. Third check valve; 16. Second electric regulating valve; 17. Fourth electric shut-off valve; 18. Bypass regulating valve; 19. Sixth electric shut-off valve; 20. First flow meter; 21. Second flow meter; 22. Third flow meter; 23. First temperature sensor; 24. Second temperature sensor; 25. Third temperature sensor; 26. Fourth temperature sensor; 27. Fifth temperature sensor; 28. Seventh electric shut-off valve; 30. Eighth electric shut-off valve; and 31. Cooling water tank; 29.

[0036] Cooling water tank 29 is used to contain cooling liquid. Passive residual heat exchanger 1 is installed in cooling water tank 29. The output end of passive residual heat exchanger 1, third electric shut-off valve 15, hot water circulation pump 2, first check valve 10, first electric shut-off valve 11, electric heater 3, eighth electric shut-off valve 31, first electric regulating valve 12, first flow meter 21, second flow meter 22, seventh electric shut-off valve 30, and input end of passive residual heat exchanger 1 are connected in sequence through pipelines. The pipelines at the output end and input end of passive residual heat exchanger 1 are respectively connected to the first temperature sensor 24 and the second temperature sensor 25.

[0037] The loop water supply tank 8 is connected to the first flow meter 21 and the second flow meter 22 via the loop water supply pump 4, the second check valve 13, and the second electric shut-off valve 14.

[0038] The nitrogen pressure regulator 7 is connected to the first flow meter 21 and the second flow meter 22 via the sixth electric shut-off valve 20.

[0039] A bypass pipeline with a bypass regulating valve 19 is provided between the third electric shut-off valve 15 and the hot water circulation pump 2, and between the first flow meter 21 and the second flow meter 22.

[0040] The cooling water tank cooler 7 is installed inside the cooling water tank 29 and is used to cool the cooling liquid contained in the cooling water tank 29. The output end of the cooling water tank cooler 7, the fourth electric shut-off valve 18, the third flow meter 23, the multi-functional test auxiliary water tank 9, the water tank cooling pump 5, the third check valve 16, the second electric regulating valve 17, and the input end of the cooling water tank cooler 7 are connected in sequence through pipelines. The fifth temperature sensor 28 and the fourth temperature sensor 27 are connected to the pipelines at the output end and the input end of the cooling water tank cooler 7, respectively.

[0041] The cooling water tank 29 is connected to a third temperature sensor 26 for detecting the temperature of the cooling liquid contained in the cooling water tank 29.

[0042] Based on the rated heat exchange capacity specified in the test conditions for the passive exhaust heat exchanger 1, configure an electric heater 3 and a cooling water tank cooler 7 of appropriate capacity. The capacity of the electric heater should preferably be at least twice the rated heat exchange capacity of the passive exhaust heat exchanger 1, and the heat exchange capacity of the cooling water tank cooler 7 should preferably be higher than the rated heat exchange capacity of the passive exhaust heat exchanger 1. Configure a suitable water tank cooling pump 5 based on the hot-side flow rate specified in the test conditions for the passive exhaust heat exchanger 1. Configure a suitable loop makeup water pump 4 and nitrogen pressure regulator 7 based on the pressure parameters specified in the test conditions for the passive exhaust heat exchanger 1. The outlet pressure of the loop makeup water pump 4 should be higher than the pressure specified in the test conditions for the passive exhaust heat exchanger 1.

[0043] In some embodiments, the rated heat exchange capacity of the electric heater 3 is greater than twice the rated heat exchange capacity of the passive exhaust heat exchanger 1.

[0044] In some embodiments, the rated heat exchange capacity of the cooling water tank cooler 7 is greater than the rated heat exchange capacity of the passive exhaust heat exchanger 1.

[0045] This invention provides a test method based on a high-temperature, high-pressure water-to-water passive residual heat exchanger thermal test apparatus placed in a cooling water tank as described in any of the above embodiments. The method includes:

[0046] During the test and evaluation of the passive residual exhaust heat exchanger 1, the commissioning is first carried out in a cold state. The first electric shut-off valve 11, the third electric shut-off valve 15, and the sixth electric shut-off valve 20 are opened, the opening of the first electric regulating valve 12 and the bypass regulating valve 19 are increased, the hot water circulation pump 2 is started, and the flow rate through the passive residual exhaust heat exchanger 1 is adjusted to near the hot side flow rate specified in the test and evaluation conditions of the passive residual exhaust heat exchanger 1 by pressurizing the nitrogen pressure regulator 7 and starting the circuit water supply pump 4, and by adjusting the opening of the first electric regulating valve 12 and the bypass regulating valve 19.

[0047] Open the fourth electric shut-off valve 18, start the water tank cooling pump 5, and adjust the flow rate in the cooling water tank cooler 7 to near the calculated value by adjusting the second electric regulating valve 17.

[0048] After the cold-state commissioning is completed, the electric heater 3 is started. The power is adjusted to the rated heat exchange capacity of the passive exhaust heat exchanger 1 as specified in the test conditions. The hot side temperature of the passive exhaust heat exchanger 1 is gradually increased. When the second temperature sensor 25 reaches the hot side temperature of the passive exhaust heat exchanger 1 as specified in the test conditions, the temperature in the cooling water tank 29 is adjusted to the cold side medium temperature as specified in the test conditions by adjusting the opening of the second electric regulating valve 17.

[0049] When the parameters of the second temperature sensor 25 and the third temperature sensor 26 are stable, the system basically reaches the test conditions specified for the passive exhaust heat exchanger 1. At this time, the required test parameters are obtained through the second flow meter 22 and the parameters of the first temperature sensor 24, the second temperature sensor 25 and the third temperature sensor 26, and the heat exchange power of the passive exhaust heat exchanger 1 is calculated.

[0050] In this embodiment of the invention, the passive exhaust heat exchanger 1 is the target device for testing. The multifunctional test auxiliary water tank 9 has the function of an air cooling tower.

[0051] This invention proposes a thermal test scheme for a high-temperature, high-pressure water-to-water passive exhaust heat exchanger placed in a cooling water tank. The test scheme comprises a passive exhaust heat exchanger, a hot water circulating pump, an electric heater, a voltage stabilizer, a loop makeup water tank, a loop makeup water pump, a cooling water tank, a cooling water tank cooler, a water tank cooling pump, piping, insulation layers, and other piping accessories. Detailed descriptions are as follows:

[0052] In the above embodiments of the present invention, the hot-side flow and temperature conditions of the passive exhaust heat exchanger are achieved through a set of electric heating and nitrogen pressure stabilization test circuits.

[0053] In the above embodiments of the present invention, the low flow rate conditions on the hot side of the passive exhaust heat exchanger are achieved by the regulating valve and the bypass branch, wherein the bypass branch contributes a significant flow rate regulation effect.

[0054] In the above embodiments of the present invention, the cold-side medium temperature of the passive exhaust heat exchanger is controlled by a cooling heat exchanger installed inside the cooling water tank. The corresponding cooling heat exchanger is configured according to the designed heat exchange capacity of the passive exhaust heat exchanger. The heat exchange capacity of the cooling heat exchanger is adjusted by temperature measurement inside the cooling water tank. If necessary, multiple cooling heat exchangers can be distributed and installed on both sides of the water tank to achieve stable medium temperature inside the cooling water tank. The cooling water tank is covered with insulation material to reduce external heat loss and enhance the stable control effect of the medium temperature inside the cooling water tank.

[0055] The thermal testing scheme for a passive water-to-water heat exchanger placed in a cooling water tank, as proposed in this invention, features a simple hot-side test loop principle, quick setup, and high reusability. The combined adjustment of regulating valves and a bypass system allows for convenient regulation of low-flow conditions on the hot side. Furthermore, by installing the heat exchanger within the cooling water tank, the temperature of the medium on the cold side of the heat exchanger can be easily controlled and adjusted.

[0056] The technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0057] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A thermal testing apparatus for a high-temperature, high-pressure water-to-water passive residual heat exchanger placed in a cooling water tank, characterized in that, The test apparatus includes: Passive residual heat exchanger (1), hot water circulation pump (2), electric heater (3), loop water supply pump (4), water tank cooling pump (5), cooling water tank cooler (6), nitrogen pressure regulator (7), loop water supply tank (8), multi-functional test auxiliary water tank (9), first check valve (10), first electric shut-off valve (11), first electric regulating valve (12), second check valve (13), second electric shut-off valve (14), third electric shut-off valve (15), third check valve (16), second electric regulating valve (17), fourth electric shut-off valve (18), bypass regulating valve (19), sixth electric shut-off valve (20), first flow meter (21), second flow meter (22), third flow meter (23), first temperature sensor (24), second temperature sensor (25), third temperature sensor (26), fourth temperature sensor (27), fifth temperature sensor (28), seventh electric shut-off valve (30), eighth electric shut-off valve (31) and cooling water tank (29); The cooling water tank (29) is used to contain cooling liquid. The passive residual heat exchanger (1) is installed in the cooling water tank (29). The output end of the passive residual heat exchanger (1), the third electric shut-off valve (15), the hot water circulation pump (2), the first check valve (10), the first electric shut-off valve (11), the electric heater (3), the eighth electric shut-off valve (31), the first electric regulating valve (12), the first flow meter (21), the second flow meter (22), the seventh electric shut-off valve (30), and the input end of the passive residual heat exchanger (1) are connected in sequence through pipelines. The first temperature sensor (24) and the second temperature sensor (25) are connected to the pipelines at the output end and the input end of the passive residual heat exchanger (1). The loop water supply tank (8) is connected to the first flow meter (21) and the second flow meter (22) in sequence through the loop water supply pump (4), the second check valve (13), and the second electric shut-off valve (14); The nitrogen pressure regulator (7) is connected to the first flow meter (21) and the second flow meter (22) via the sixth electric shut-off valve (20); A bypass pipeline with a bypass regulating valve (19) is provided between the third electric shut-off valve (15) and the hot water circulation pump (2) and between the first flow meter (21) and the second flow meter (22); The cooling water tank cooler (7) is installed inside the cooling water tank (29) and is used to cool the cooling liquid contained in the cooling water tank (29). The output end of the cooling water tank cooler (7), the fourth electric shut-off valve (18), the third flow meter (23), the multi-functional test auxiliary water tank (9), the water tank cooling pump (5), the third check valve (16), the second electric regulating valve (17), and the input end of the cooling water tank cooler (7) are connected in sequence through pipelines. The fifth temperature sensor (28) and the fourth temperature sensor (27) are connected to the pipelines at the output end and the input end of the cooling water tank cooler (7). The cooling water tank (29) is connected to the third temperature sensor (26) for detecting the temperature of the cooling liquid contained in the cooling water tank (29).

2. The thermal test apparatus for a high-temperature, high-pressure water-to-water passive residual heat exchanger placed in a cooling water tank according to claim 1, characterized in that, The rated heat exchange capacity of the electric heater (3) is more than twice the rated heat exchange capacity of the passive exhaust heat exchanger (1).

3. The thermal test apparatus for a high-temperature, high-pressure water-to-water passive residual heat exchanger placed in a cooling water tank according to claim 1, characterized in that, The rated heat exchange capacity of the cooling water tank cooler (7) is greater than the rated heat exchange capacity of the passive exhaust heat exchanger (1).

4. A test method, characterized in that, Based on the thermal test apparatus for a high-temperature, high-pressure water-to-water passive residual heat exchanger placed in a cooling water tank as described in any one of claims 1 to 3, the method includes: When testing the passive residual heat exchanger (1), it is first debugged in a cold state. The first electric shut-off valve (11), the third electric shut-off valve (15), and the sixth electric shut-off valve (20) are opened. The opening of the first electric regulating valve (12) and the bypass regulating valve (19) are increased. The hot water circulation pump (2) is started. By pressurizing the nitrogen pressure regulator (7) and starting the loop water supply pump (4), the flow rate through the passive residual heat exchanger (1) is adjusted to be close to the hot side flow rate specified in the test conditions of the passive residual heat exchanger (1) by adjusting the opening of the first electric regulating valve (12) and the bypass regulating valve (19). Open the fourth electric shut-off valve (18), start the water tank cooling pump (5), and adjust the flow rate in the cooling water tank cooler (7) to near the calculated value by adjusting the second electric regulating valve (17); After the cold-state debugging is completed, the electric heater (3) is started. The electric power is adjusted to the rated heat exchange capacity of the heat exchanger specified in the test and assessment conditions of the passive residual exhaust heat exchanger (1) by adjusting the power. The hot side temperature of the passive residual exhaust heat exchanger (1) is gradually increased. When the second temperature sensor (25) reaches the hot side temperature of the heat exchanger specified in the test and assessment conditions of the passive residual exhaust heat exchanger (1), the temperature in the cooling water tank (29) is adjusted to the cold side medium temperature specified in the test and assessment conditions of the passive residual exhaust heat exchanger (1) by adjusting the opening of the second electric regulating valve (17). When the parameters of the second temperature sensor (25) and the third temperature sensor (26) are stable, the system basically reaches the test conditions specified by the passive exhaust heat exchanger (1). At this time, the required test parameters are obtained through the second flow meter (22), the parameters of the first temperature sensor (24), the second temperature sensor (25), and the third temperature sensor (26), and the heat exchange power of the passive exhaust heat exchanger (1) is calculated.

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