Thermal test device and method for high-temperature and high-pressure steam-water passive residual discharge heat exchanger arranged in cooling water tank

Abstract

The embodiment of the invention provides a thermal test device and method for a high-temperature and high-pressure steam-water passive residual discharge heat exchanger arranged in a cooling water tank. The test device comprises a passive residual discharge heat exchanger, a steam boiler, a multifunctional test auxiliary water tank, a water tank cooling pump, a cooling water tank cooler, a first electric stop valve, a first electric control valve and a check valve, the system comprises a first electric control valve, a second electric control valve, a third electric stop valve, a first flowmeter, a second flowmeter, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, a second electric stop valve and a cooling water tank. According to the technical scheme, the actual operation condition of the passive residual discharge heat exchanger can be conveniently simulated, the steam flow of the hot side is adjusted, and the steady-state temperature condition of the cold side is controlled.

Description

Technical Field

[0001] The present application relates to the field of ship propulsion technology, and in particular to a thermal engineering test device and method for a high-temperature and high-pressure steam-water passive exhaust heat exchanger placed in a cooling water tank. Background Art

[0002] In the field of ship propulsion, the role of the 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 exchanger is high-temperature and high-pressure steam, and the cold side is water in the cooling water tank. For this high-temperature and high-pressure steam-water passive waste heat exchanger placed in the cooling water tank, its thermal engineering assessment test is mainly different from the conventional heat exchanger assessment test in the following ways:

[0003] (1) For conventional heat exchangers, the temperature and flow rate of the hot and cold sides of the heat exchanger are basically stable during operation, and these stable test conditions are used in thermal tests. For passive residual heat removal heat exchangers, the temperature and flow rate of the hot and cold sides of the heat exchanger are constantly changing with the shutdown time, overboard 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 the principle is natural circulation heat exchange, the flow rates on the hot and cold sides of the passive exhaust heat exchanger are relatively low when it is in operation. It is difficult to adjust to the parameters required for the test assessment by directly using a regulating valve.

[0006] (4) It is necessary to improve the versatility of the passive exhaust heat exchanger test system as much as possible, and the test system can be easily applied to other steam-water natural circulation heat exchangers. Summary of the invention

[0007] In response to the need for thermal performance assessment testing of a high-temperature, high-pressure steam-water passive waste heat removal heat exchanger placed in a cooling water tank, an embodiment of the present invention proposes a thermal performance test scheme for a high-temperature, high-pressure steam-water passive waste heat removal heat exchanger placed in a cooling water tank. This technical scheme can conveniently simulate the actual operating conditions of the passive waste heat exchanger, realize the regulation of the steam flow on the hot side, and realize the control of the steady-state temperature conditions on the cold side.

[0008] An embodiment of the present invention provides a thermal test device for a high-temperature and high-pressure steam-water passive exhaust heat exchanger placed in a cooling water tank, the test device comprising:

[0009] Passive waste heat exchanger 1, steam boiler 2, multifunctional test auxiliary water tank 3, water tank cooling pump 4, cooling water tank cooler 5, first electric stop valve 7, first electric regulating valve 8, check valve 9, second electric regulating valve 10, third electric stop valve 11, first flow meter 12, second flow meter 13, first temperature sensor 14, second temperature sensor 15, third temperature sensor 16, fourth temperature sensor 17, fifth temperature sensor 18, second electric stop valve 19 and cooling water tank 6;

[0010] The cooling water tank 6 is used to contain cooling liquid, and the passive waste heat exchanger 1 is arranged in the cooling water tank 6;

[0011] The boiler water inlet pipeline sequentially connects the steam boiler 2, the first electric regulating valve 8, the first flow meter 12, the second electric stop valve 19, the passive waste heat exchanger 1, the first electric stop valve 7 to the cooling water system pipeline, and the output end and input end of the passive waste heat exchanger 1 are correspondingly connected to the first temperature sensor 14 and the second temperature sensor 15;

[0012] The cooling water tank cooler 5 is arranged in the cooling water tank 6, and is used to cool the cooling liquid contained in the cooling water tank 6. The output end of the cooling water tank cooler 6, the third electric stop valve 11, the second flow meter 13, the multifunctional test auxiliary water tank 3, the water tank cooling pump 4, the check valve 9, the second electric regulating valve 10, and the input end of the cooling water tank cooler 5 are connected in sequence through pipelines, and the pipelines at the output end and the input end of the cooling water tank cooler 5 are correspondingly connected with the fourth temperature sensor 17 and the third temperature sensor 16;

[0013] The cooling water tank 6 is connected to the fifth temperature sensor 18 for detecting the temperature of the cooling liquid contained in the cooling water tank 6 .

[0014] In some embodiments, the steam generation capacity of the steam boiler 2 is more than twice the rated steam flow rate of the passive exhaust heat exchanger 1 .

[0015] In some embodiments, the steam pressure of the steam boiler 2 is higher than the steam pressure on the hot side of the passive exhaust heat exchanger 1 .

[0016] In some embodiments, the rated heat exchange capacity of the cooling water tank cooler 5 is higher than the rated heat exchange capacity of the passive exhaust heat exchanger 1 .

[0017] An embodiment of the present invention provides a test method, based on the thermal test device for a high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater as described in any of the above embodiments, the method comprising:

[0018] During the test and assessment of the passive exhaust heat exchanger 1, firstly, commissioning is performed in a cold state, and the relevant commissioning of the steam boiler 2 is completed;

[0019] Open the third electric stop valve 11, start the water tank cooling pump 4, and adjust the flow rate in the cooling water tank cooler 5 to near the calculated value by adjusting the second electric regulating valve 10;

[0020] After the cold commissioning is completed, the steam boiler 2 is started, and the pressure and steam output of the steam boiler are adjusted to the pressure and steam output specified in the test and assessment working conditions of the passive exhaust heat exchanger 1 by adjusting the power;

[0021] When the parameters of the second temperature sensor 15 and the fifth temperature sensor 18 are stable, the system basically reaches the test and assessment conditions specified for the passive waste heat exchanger 1. At this time, the required test parameters are obtained through the first flow meter 12, the first temperature sensor 14, the second temperature sensor 15, and the fifth temperature sensor 18 parameters, and the heat exchange power of the passive waste heat exchanger 1 is calculated.

[0022] The beneficial effects of the above embodiments of the present invention include:

[0023] The hot side test circuit of the thermal engineering test scheme for high temperature and high pressure steam-water passive exhaust heat exchanger placed in the cooling water tank proposed in the embodiment of the present application is simple in principle, quick to set up, and highly reusable. The hot side flow conditions can be easily adjusted through the joint action of the steam boiler and the regulating valve. By setting the heat exchanger in the cooling water tank, the flow and temperature conditions of the medium on the cold side of the heat exchanger can be easily controlled and adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings illustrate generally, by way of example and not limitation, various embodiments discussed herein.

[0025] Figure 1 It is a structural schematic diagram of a thermal testing device for a high-temperature and high-pressure steam-water passive exhaust heat exchanger placed in a cooling water tank according to an embodiment of the present invention.

[0026] Explanation of symbols:

[0027] 1- passive waste heat exchanger, 2- steam boiler, 3- multi-functional test auxiliary water tank, 4- water tank cooling pump, 5- cooling water tank cooler, 6- cooling water tank, 7- first electric stop valve, 8- first electric regulating valve, 9- first check valve, 10- second electric regulating valve, 11- third electric stop valve, 12- first flow meter, 13- second flow meter, 14- first temperature sensor, 15- second temperature sensor, 16- third temperature sensor, 17- fourth temperature sensor, 18- fifth temperature sensor, 19- second electric stop valve. DETAILED DESCRIPTION

[0028] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

[0029] In the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, it can be an electrical connection or a connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0030] It should be noted that the terms "first\second\third" involved in the embodiments of the present application are only used to distinguish similar objects, and do not represent a specific order for the objects. It is understandable that the specific order or sequence of "first\second\third" can be interchanged where permitted. It should be understood that the objects distinguished by "first\second\third" can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0031] The patent of this invention belongs to the field of ship power technology, and specifically relates to a thermal testing scheme for a high-temperature and high-pressure steam-water passive exhaust heat exchanger placed in a cooling water tank. It can be applied to the thermal-hydraulic testing of a high-temperature and high-pressure steam-water passive exhaust heat exchanger placed in a cooling water tank, and can be used as a reference for thermal-hydraulic testing of other types of water-water circulation natural circulation heat exchangers.

[0032] The following is combined with Figure 1 The embodiments of the present invention are described in detail. Figure 1 This is a schematic diagram of the thermal test device structure of a high-temperature and high-pressure steam-water passive exhaust heat exchanger placed in a cooling water tank according to an embodiment of the present invention.

[0033] The embodiment of the present invention provides a thermal test device for a high-temperature and high-pressure steam-water passive exhaust heat exchanger placed in a cooling water tank, such as Figure 1 As shown, the test device includes:

[0034] Passive waste heat exchanger 1, steam boiler 2, multi-functional test auxiliary water tank 3, water tank cooling pump 4, cooling water tank cooler 5, first electric stop valve 7, first electric regulating valve 8, check valve 9, second electric regulating valve 10, third electric stop valve 11, first flow meter 12, second flow meter 13, first temperature sensor 14, second temperature sensor 15, third temperature sensor 16, fourth temperature sensor 17, fifth temperature sensor 18, second electric stop valve 19 and cooling water tank 6.

[0035] The cooling water tank 6 is used to contain cooling liquid, and the passive waste heat exchanger 1 is arranged in the cooling water tank 6 .

[0036] The boiler water inlet pipeline is connected in sequence to the steam boiler 2, the first electric regulating valve 8, the first flow meter 12, the second electric stop valve 19, the passive waste heat exchanger 1, the first electric stop valve 7 to the cooling water system pipeline, and the pipelines at the output and input ends of the passive waste heat exchanger 1 are correspondingly connected to the first temperature sensor 14 and the second temperature sensor 15.

[0037] The cooling water tank cooler 5 is arranged in the cooling water tank 6, and is used for cooling the cooling liquid contained in the cooling water tank 6. The output end of the cooling water tank cooler 6, the third electric stop valve 11, the second flow meter 13, the multi-functional test auxiliary water tank 3, the water tank cooling pump 4, the check valve 9, the second electric regulating valve 10, and the input end of the cooling water tank cooler 5 are connected in sequence through pipelines, and the pipelines at the output end and the input end of the cooling water tank cooler 5 are correspondingly connected with the fourth temperature sensor 17 and the third temperature sensor 16.

[0038] The cooling water tank 6 is connected to a fifth temperature sensor 18 for detecting the temperature of the cooling liquid contained in the cooling water tank 6 .

[0039] In some embodiments, the steam generation capacity of the steam boiler 2 is more than twice the rated steam flow rate of the passive exhaust heat exchanger 1 .

[0040] In some embodiments, the steam pressure of the steam boiler 2 is higher than the steam pressure on the hot side of the passive exhaust heat exchanger 1 .

[0041] In some embodiments, the rated heat exchange capacity of the cooling water tank cooler 5 is higher than that of the passive exhaust heat exchanger 1 .

[0042] According to the rated heat exchange capacity of the heat exchanger specified in the test and assessment conditions of the passive waste heat exchanger 1, the steam boiler 1 and the cooling water tank cooler 5 of appropriate capacity are configured. The steam generation of the steam boiler 1 should be more than twice the rated steam flow of the passive waste heat exchanger 1. The steam pressure of the steam boiler 2 should be higher than the hot side steam pressure of the passive waste heat exchanger 1. The heat exchanger of the cooling water tank cooler 6 should be higher than the rated heat exchange capacity of the passive waste heat exchanger 1. According to the hot side steam flow rate specified in the test and assessment conditions of the passive waste heat exchanger 1, the flow velocity of the water inside the cooling water tank 23 and other parameters, appropriate water tank cooling pumps 5 and water tank flow circulation pumps 4 are configured.

[0043] In the embodiment of the present invention, the passive exhaust heat exchanger 1 is the target device for the test. The multifunctional test auxiliary water tank 3 has the function of an air cooling tower.

[0044] An embodiment of the present invention provides a test method, based on a thermal test device for a high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater according to any of the above embodiments, the method comprising:

[0045] When testing and assessing the passive exhaust heat exchanger 1, firstly carry out debugging in a cold state and complete the relevant debugging of the steam boiler 2.

[0046] The third electric stop valve 11 is opened, the water tank cooling pump 4 is started, and the flow rate in the cooling water tank cooler 5 is adjusted to be close to the calculated value by adjusting the second electric regulating valve 10.

[0047] After the cold commissioning is completed, start the steam boiler 2, and adjust the pressure and steam output of the steam boiler to the pressure and steam output specified by the test assessment condition of the passive exhaust heat exchanger 1 by adjusting the power.

[0048] When the parameters of the second temperature sensor 15 and the fifth temperature sensor 18 are stable, the system basically reaches the test and assessment conditions specified for the passive waste heat exchanger 1. At this time, the required test parameters are obtained through the first flow meter 12, the first temperature sensor 14, the second temperature sensor 15, and the fifth temperature sensor 18, and the heat exchange power of the passive waste heat exchanger 1 is calculated.

[0049] The present invention proposes a thermal test scheme for a high-temperature and high-pressure steam-water passive exhaust heat exchanger placed in a cooling water tank. The test scheme includes a passive exhaust heat exchanger, a steam boiler, a cooling water tank, a cooling water tank cooler, a water tank cooling pump, pipelines, an insulation layer and other pipeline accessories. The specific description is as follows:

[0050] In the above-mentioned embodiments of the present invention, the flow and temperature conditions on the hot side of the passive exhaust heat exchanger are realized by means of a steam boiler and a regulating valve.

[0051] In the above embodiment of the present invention, the temperature of the medium on the cold side of the passive exhaust heat exchanger is controlled by the cooling heat exchanger arranged 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 the temperature measurement condition arranged inside the cooling water tank. If necessary, it is possible to consider dispersing multiple cooling heat exchangers on both sides of the water tank to achieve the stability of the medium temperature in the cooling water tank. The cooling water tank is coated with thermal insulation material to reduce external heat dissipation and enhance the effect of stable control of the medium temperature in the cooling water tank.

[0052] The hot side test circuit of the thermal engineering test scheme for high temperature and high pressure steam-water passive exhaust heat exchanger placed in the cooling water tank proposed in the embodiment of the present application is simple in principle, quick to set up, and highly reusable. The hot side flow conditions can be easily adjusted through the joint action of the steam boiler and the regulating valve. By setting the heat exchanger in the cooling water tank, the flow and temperature conditions of the medium on the cold side of the heat exchanger can be easily controlled and adjusted.

[0053] The technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0054] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A thermal test device for a high-temperature and high-pressure steam-water passive exhaust heat exchanger placed in a cooling water tank, characterized in that: The test device comprises: Passive waste heat exchanger (1), steam boiler (2), multifunctional test auxiliary water tank (3), water tank cooling pump (4), cooling water tank cooler (5), first electric stop valve (7), first electric regulating valve (8), check valve (9), second electric regulating valve (10), third electric stop valve (11), first flow meter (12), second flow meter (13), first temperature sensor (14), second temperature sensor (15), third temperature sensor (16), fourth temperature sensor (17), fifth temperature sensor (18), second electric stop valve (19) and cooling water tank (6); The cooling water tank (6) is used to contain cooling liquid, and the passive waste heat exchanger (1) is arranged in the cooling water tank (6); The boiler water inlet pipeline is connected in sequence to the steam boiler (2), the first electric regulating valve (8), the first flow meter (12), the second electric stop valve (19), the passive waste heat exchanger (1), the first electric stop valve (7) and the cooling water system pipeline, and the pipelines at the output end and the input end of the passive waste heat exchanger (1) are connected to the first temperature sensor (14) and the second temperature sensor (15) respectively; The cooling water tank cooler (5) is arranged in the cooling water tank (6) and is used to cool the cooling liquid contained in the cooling water tank (6); the output end of the cooling water tank cooler (6), the third electric stop valve (11), the second flow meter (13), the multifunctional test auxiliary water tank (3), the water tank cooling pump (4), the check valve (9), the second electric regulating valve (10), and the input end of the cooling water tank cooler (5) are connected in sequence through pipelines; the output end and the input end of the cooling water tank cooler (5) are connected to the fourth temperature sensor (17) and the third temperature sensor (16) through the pipelines correspondingly; The cooling water tank (6) is connected to the fifth temperature sensor (18) for detecting the temperature of the cooling liquid contained in the cooling water tank (6).

2. The thermal test device for high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater according to claim 1 is characterized in that: The steam generation amount of the steam boiler (2) is more than twice the rated steam flow rate of the passive exhaust heat exchanger (1).

3. The thermal test device for high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater according to claim 1 is characterized in that: The steam pressure of the steam boiler (2) is higher than the steam pressure on the hot side of the passive exhaust heat exchanger (1).

4. The thermal test device for high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater according to claim 1 is characterized in that: The rated heat exchange capacity of the cooling water tank cooler (5) is higher than the rated heat exchange capacity of the passive exhaust heat exchanger (1).

5. A test method, characterized in that: Based on the thermal testing device for the high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater according to any one of claims 1 to 4, the method comprises: When testing and assessing the passive exhaust heat exchanger (1), firstly, commissioning is performed in a cold state, and the relevant commissioning of the steam boiler (2) is completed; Open the third electric stop valve (11), start the water tank cooling pump (4), and adjust the flow rate in the cooling water tank cooler (5) to a value close to the calculated value by adjusting the second electric regulating valve (10); After the cold state commissioning is completed, the steam boiler (2) is started, and the pressure and steam output of the steam boiler are adjusted to the pressure and steam output specified in the test and assessment working conditions of the passive exhaust heat exchanger (1) by adjusting the power; When the parameters of the second temperature sensor (15) and the fifth temperature sensor (18) are stable, the system basically reaches the test and assessment conditions specified for the passive waste heat exchanger (1). At this time, the required test parameters are obtained through the first flow meter (12), the first temperature sensor (14), the second temperature sensor (15), and the fifth temperature sensor (18), and the heat exchange power of the passive waste heat exchanger (1) is calculated.

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