Thermal test device and method for high-temperature and high-pressure steam-water passive residual discharge heat exchanger directly soaked in seawater

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 directly soaked in seawater. The device comprises a passive residual discharge heat exchanger, a steam boiler, a multifunctional test auxiliary water tank, a water tank cooling pump, a water tank flow circulating pump, a cooling water tank cooler, a first electric stop valve, a first electric control valve, a first check valve, a second electric control valve, a third electric stop valve, a second check valve, a third electric control valve and a fourth electric stop 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 fifth 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 on the hot side can be adjusted, and the small-flow flowing condition and the steady-state temperature condition on the cold side can be 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 directly immersed in seawater. 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 seawater outside the ship. For this kind of high-temperature and high-pressure steam-water passive waste heat exchanger directly immersed in seawater, 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 directly immersed in seawater does not have the concept of the shell side of a conventional heat exchanger, so it is necessary to simulate the flow and temperature conditions of the seawater outside the ship.

[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 water-water circulation natural circulation heat exchangers. Summary of the invention

[0007] In response to the need for thermal assessment testing of high-temperature and high-pressure steam-water passive waste heat removal heat exchangers directly immersed in seawater, an embodiment of the present invention proposes a thermal testing scheme for high-temperature and high-pressure steam-water passive waste heat removal heat exchangers directly immersed in seawater. 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 small flow flow conditions and steady-state temperature conditions on the cold side.

[0008] An embodiment of the present invention provides a thermal testing device for a high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater, the device comprising:

[0009] Passive waste heat exchanger 1, steam boiler 2, multifunctional test auxiliary water tank 3, water tank cooling pump 4, water tank flow circulation pump 5, cooling water tank cooler 6, first electric stop valve 7, first electric regulating valve 8, first check valve 9, second electric regulating valve 10, third electric stop valve 11, second check valve 12, third electric regulating valve 13, fourth electric stop valve 14, first flow meter 15, second flow meter 16, third flow meter 17, first temperature sensor 18, second temperature sensor 19, third temperature sensor 20, fourth temperature sensor 21, fifth temperature sensor 22, fifth electric stop valve 24 and cooling water tank 23;

[0010] The cooling water tank 23 is used to contain cooling liquid, and the passive waste heat exchanger 1 is arranged in the cooling water tank 23;

[0011] The boiler water inlet pipeline is connected to the steam boiler 2, the first electric regulating valve 8, the first flow meter 15, the first electric stop valve 7, the passive waste heat exchanger 1, the fifth electric stop valve 24 to the cooling water system pipeline in sequence, and the output end and the input end of the passive waste heat exchanger 1 are correspondingly connected to the first temperature sensor 18 and the second temperature sensor 19;

[0012] The cooling water tank cooler 6 is arranged in the cooling water tank 23, and is used to cool the cooling liquid contained in the cooling water tank 23. The output end of the cooling water tank cooler 6, the third electric stop valve 11, the third flow meter 17, the multifunctional test auxiliary water tank 3, the water tank cooling pump 4, the first check valve 9, the second electric regulating valve 10, and the input end of the cooling water tank cooler 6 are connected in sequence through pipelines, and the pipelines at the output end and the input end of the cooling water tank cooler 6 are correspondingly connected with the fourth temperature sensor 21 and the third temperature sensor 20;

[0013] The output end of the cooling water tank 23, the fourth electric stop valve 14, the second flow meter 16, the multifunctional test auxiliary water tank 3, the water tank flow circulation pump 5, the second check valve 12, the third electric regulating valve 13, and the input end of the cooling water tank 23 are connected in sequence through pipelines, and the cooling water tank 23 is connected to the fifth temperature sensor 22 for detecting the temperature of the cooling liquid contained in the cooling water tank 23.

[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 6 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 fourth electric stop valve 14, start the water tank flow circulation pump 5, and adjust the flow rate of the water body inside the cooling water tank 23 to the vicinity of the cold side medium flow rate specified in the test assessment working condition of the passive residual heat exchanger 1 by adjusting the third electric regulating valve 13;

[0020] 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 6 to near the calculated value by adjusting the second electric regulating valve 10;

[0021] 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;

[0022] When the parameters of the second temperature sensor 19 and the fifth temperature sensor 22 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 15, the first temperature sensor 18, the second temperature sensor 19, and the fifth temperature sensor 22 parameters, and the heat exchange power of the passive waste heat exchanger 1 is calculated.

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

[0024] The hot side test circuit of the thermal engineering test scheme for high temperature and high pressure steam-water passive exhaust heat exchanger directly immersed in seawater 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 arranging a heat exchanger in the cooling water tank and adjusting the flow rate of the medium entering 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

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

[0026] Figure 1A schematic structural diagram of a thermal test device for a high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater is provided for an embodiment of the present invention.

[0027] Explanation of symbols:

[0028] 1- passive waste heat exchanger, 2- steam boiler, 3- multi-functional test auxiliary water tank, 4- water tank cooling pump, 5- water tank flow circulation pump, 6- cooling water tank cooler, 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- second check valve, 13- third electric regulating valve, 14- fourth electric stop valve, 15- first flow meter, 16- second flow meter, 17- third flow meter, 18- first temperature sensor, 19- second temperature sensor, 20- third temperature sensor, 21- fourth temperature sensor, 22- fifth temperature sensor, 23- cooling water tank, 24- fifth electric stop valve. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The patent of this invention belongs to the field of ship power technology, and specifically relates to a thermal test scheme for a high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater. It can be applied to the thermal-hydraulic test of a high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater, and can be used as a reference for thermal-hydraulic tests of other types of water-water circulation natural circulation heat exchangers.

[0033] In response to the need for thermal assessment testing of high-temperature and high-pressure steam-water passive waste heat removal heat exchangers directly immersed in seawater, an embodiment of the present invention proposes a thermal testing scheme for high-temperature and high-pressure steam-water passive waste heat removal heat exchangers directly immersed in seawater. 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 small flow flow conditions and steady-state temperature conditions on the cold side.

[0034] The following is combined with Figure 1 The embodiments of the present invention are described in detail. Figure 1 A schematic structural diagram of a thermal test device for a high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater is provided for an embodiment of the present invention.

[0035] The embodiment of the present invention provides a thermal test device for a high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater, such as Figure 1 As shown, the device comprises:

[0036] Passive waste heat exchanger 1, steam boiler 2, multifunctional test auxiliary water tank 3, water tank cooling pump 4, water tank flow circulation pump 5, cooling water tank cooler 6, first electric stop valve 7, first electric regulating valve 8, first check valve 9, second electric regulating valve 10, third electric stop valve 11, second check valve 12, third electric regulating valve 13, fourth electric stop valve 14, first flow meter 15, second flow meter 16, third flow meter 17, first temperature sensor 18, second temperature sensor 19, third temperature sensor 20, fourth temperature sensor 21, fifth temperature sensor 22, fifth electric stop valve 24 and cooling water tank 23.

[0037] The cooling water tank 23 is used to contain cooling liquid, and the passive exhaust heat exchanger 1 is arranged in the cooling water tank 23 .

[0038] The boiler water inlet pipeline is connected in sequence to the steam boiler 2, the first electric regulating valve 8, the first flow meter 15, the first electric stop valve 7, the passive waste heat exchanger 1, the fifth electric stop valve 24 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 18 and the second temperature sensor 19.

[0039] The cooling water tank cooler 6 is arranged in the cooling water tank 23, and is used for cooling the cooling liquid contained in the cooling water tank 23. The output end of the cooling water tank cooler 6, the third electric stop valve 11, the third flow meter 17, the multi-functional test auxiliary water tank 3, the water tank cooling pump 4, the first check valve 9, the second electric regulating valve 10, and the input end of the cooling water tank cooler 6 are connected in sequence through pipelines, and the pipelines at the output end and the input end of the cooling water tank cooler 6 are correspondingly connected with the fourth temperature sensor 21 and the third temperature sensor 20.

[0040] The output end of the cooling water tank 23, the fourth electric stop valve 14, the second flow meter 16, the multifunctional test auxiliary water tank 3, the water tank flow circulation pump 5, the second check valve 12, the third electric regulating valve 13, and the input end of the cooling water tank 23 are connected in sequence through pipelines. The cooling water tank 23 is connected to a fifth temperature sensor 22 for detecting the temperature of the cooling liquid contained in the cooling water tank 23.

[0041] 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 .

[0042] 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 .

[0043] In some embodiments, the rated heat exchange capacity of the cooling water tank cooler 6 is higher than that of the passive exhaust heat exchanger 1 .

[0044] 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 6 of appropriate capacity are configured. The steam generation of the steam boiler 2 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 rated heat exchange capacity 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 and the flow velocity of the water inside the cooling water tank 23 specified in the test and assessment conditions of the passive waste heat exchanger 1, the appropriate water tank cooling pump 5 and water tank flow circulation pump 4 are configured.

[0045] 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.

[0046] 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:

[0047] 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.

[0048] Open the fourth electric stop valve 14, start the water tank flow circulation pump 5, and adjust the flow rate of the water inside the cooling water tank 23 to near the cold side medium flow rate specified in the test and assessment conditions of the passive waste heat exchanger 1 by adjusting the third electric regulating valve 13.

[0049] 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 6 is adjusted to be close to the calculated value by adjusting the second electric regulating valve 10.

[0050] 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.

[0051] When the parameters of the second temperature sensor 19 and the fifth temperature sensor 22 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 15, the first temperature sensor 18, the second temperature sensor 19, and the fifth temperature sensor 22, and the heat exchange power of the passive waste heat exchanger 1 is calculated.

[0052] The present invention proposes a thermal engineering test scheme for a high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater. 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, a water tank flow circulation pump, pipelines, an insulation layer and other pipeline accessories.

[0053] 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.

[0054] In the above-mentioned embodiment of the present invention, the small flow condition of the medium on the cold side of the passive exhaust heat exchanger is achieved by controlling the flow rate of the medium entering the cooling water tank.

[0055] 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.

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

[0057] 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 directly immersed in seawater, characterized in that: The device comprises: Passive waste heat exchanger (1), steam boiler (2), multifunctional test auxiliary water tank (3), water tank cooling pump (4), water tank flow circulation pump (5), cooling water tank cooler (6), first electric stop valve (7), first electric regulating valve (8), first check valve (9), second electric regulating valve (10), third electric stop valve (11), second check valve (12), third electric regulating valve (13), electric stop valve (14), first flow meter (15), second flow meter (16), third flow meter (17), first temperature sensor (18), second temperature sensor (19), third temperature sensor (20), fourth temperature sensor (21), fifth temperature sensor (22), fifth electric stop valve (24) and cooling water tank (23); The cooling water tank (23) is used to contain cooling liquid, and the passive waste heat exchanger (1) is arranged in the cooling water tank (23); The boiler water inlet pipeline is connected in sequence to the steam boiler (2), the first electric regulating valve (8), the first flow meter (15), the first electric stop valve (7), the passive waste heat exchanger (1), the fifth electric stop valve (24) 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 (18) and the second temperature sensor (19) respectively; The cooling water tank cooler (6) is arranged in the cooling water tank (23) and is used to cool the cooling liquid contained in the cooling water tank (23); the output end of the cooling water tank cooler (6), the third electric stop valve (11), the third flow meter (17), the multifunctional test auxiliary water tank (3), the water tank cooling pump (4), the first check valve (9), the second electric regulating valve (10), and the input end of the cooling water tank cooler (6) are connected in sequence through pipelines; the pipelines at the output end and the input end of the cooling water tank cooler (6) are correspondingly connected to the fourth temperature sensor (21) and the third temperature sensor (20); The output end of the cooling water tank (23), the fourth electric stop valve (14), the second flow meter (16), the multifunctional test auxiliary water tank (3), the water tank flow circulation pump (5), the second check valve (12), the third electric regulating valve (13), and the input end of the cooling water tank (23) are connected in sequence through pipelines, and the cooling water tank (23) is connected to the fifth temperature sensor (22) for detecting the temperature of the cooling liquid contained in the cooling water tank (23).

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 waste 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 (6) 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 fourth electric stop valve (14), start the water tank flow circulation pump (5), and adjust the flow rate of the water body inside the cooling water tank (23) to near the cold side medium flow rate specified in the test assessment working condition of the passive waste heat exchanger (1) by adjusting the third electric regulating valve (13); 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 (6) 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 (19) and the fifth temperature sensor (22) 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 (15), the first temperature sensor (18), the second temperature sensor (19), and the fifth temperature sensor (22), and the heat exchange power of the passive waste heat exchanger (1) is calculated.

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