A thermal testing device and method for a high-temperature and high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater

Abstract

An embodiment of the present invention provides a thermal testing device and method for a high-temperature, high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater. The device includes: a passive exhaust heat exchanger, a steam boiler, a multifunctional test auxiliary water tank, a water tank cooling pump, a water tank flow circulation pump, a cooling water tank cooler, a first electric stop valve, a first electric regulating valve, a first check valve, a second electric regulating valve, a third electric stop valve, a second check valve, a third electric regulating valve, 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. This technical solution can conveniently simulate the actual operating conditions of a passive exhaust heat exchanger, achieve regulation of the steam flow on the hot side, and control of low-flow flow conditions and steady-state temperature conditions on the cold side.

Description

Technical Field

[0001] The present application relates to the field of ship propulsion technology, and in particular to a thermal testing 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 marine propulsion, the role of a passive waste heat removal system is to remove the decay heat of the reactor to a 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, high-pressure steam, and the cold side is seawater outside the ship. For this type of high-temperature, high-pressure steam-water passive waste heat exchanger directly immersed in seawater, the thermal performance test differs from that of conventional heat exchangers in the following key aspects:

[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. These stable test conditions are used during thermal testing. 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. Therefore, one or more typical operating conditions must 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 side and cold side 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 the 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 performance testing of high-temperature, high-pressure steam-water passive waste heat removal heat exchangers directly immersed in seawater, an embodiment of the present invention proposes a thermal performance testing scheme for high-temperature, 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 achieve the control of the low-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 exhaust heat exchanger 1, steam boiler 2, multi-function 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 exhaust heat exchanger 1 is arranged in the cooling water tank 23;

[0011] The boiler water inlet pipeline sequentially connects 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 output end and input end pipelines 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. The output end and the input end of the cooling water tank cooler 6 are correspondingly connected to the pipelines 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. 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 that of the passive exhaust heat exchanger 1 .

[0017] An embodiment of the present invention provides a test method based on the thermal testing device for a high-temperature, 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 carry out commissioning in a cold state and complete the relevant commissioning of the steam boiler 2;

[0019] Open the fourth electric stop valve 14, start the water tank flow circulation pump 5, and adjust the flow rate of the water in the cooling water tank 23 to the cold side medium flow rate specified in the test and assessment conditions of the passive exhaust 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 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 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 thermal testing scheme for a high-temperature, high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater, proposed in this application, features a simple hot-side test circuit, quick setup, and high reusability. The hot-side flow conditions can be easily adjusted through the combined action of a steam boiler and a regulating valve. By placing the heat exchanger within a 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 accompanying drawings illustrate generally, by way of example and not limitation, various embodiments discussed herein.

[0026] Figure 1A schematic structural diagram of a thermal testing 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-function 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 with reference to 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 description of the embodiments of this 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 it can be the internal 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 meaning of the above terms can be understood according to the specific circumstances.

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

[0032] 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, high-pressure steam-water passive exhaust heat exchanger directly immersed in seawater. It can be applied to the thermal-hydraulic testing of high-temperature, high-pressure steam-water passive exhaust heat exchangers directly immersed in seawater, and can be used as a reference for thermal-hydraulic testing of other types of water-water natural circulation heat exchangers.

[0033] In response to the need for thermal performance testing of high-temperature, high-pressure steam-water passive waste heat removal heat exchangers directly immersed in seawater, an embodiment of the present invention proposes a thermal performance testing scheme for high-temperature, 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 achieve the control of the low-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 testing 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 includes:

[0036] Passive waste heat exchanger 1, steam boiler 2, multi-functional 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 disposed 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 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 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. 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.

[0040] The output end of the cooling water tank 23, the fourth electric stop valve 14, the second flow meter 16, the multi-functional 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] Configure steam boiler 1 and cooling water tank cooler 6 of appropriate capacity based on the rated heat exchange capacity of the heat exchanger specified in the test and assessment conditions for passive exhaust heat exchanger 1. Steam boiler 2's steam production should ideally be at least twice the rated steam flow of passive exhaust heat exchanger 1. Steam boiler 2's steam pressure should be higher than the hot-side steam pressure of passive exhaust heat exchanger 1. Cooling water tank cooler 6's rated heat exchange capacity should ideally be higher than that of passive exhaust heat exchanger 1. Configure water tank cooling pump 5 and water tank circulation pump 4 appropriately based on parameters such as the hot-side steam flow rate and the water flow velocity within cooling water tank 23 specified in the test and assessment conditions for passive exhaust heat exchanger 1.

[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] During the test and assessment of the passive exhaust heat exchanger 1, first debug it 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 water flow rate inside the cooling water tank 23 to near the cold side medium flow rate specified in the test assessment condition of the passive exhaust 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 production of the steam boiler to the pressure and steam production specified in the test assessment working conditions 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 embodiments of the present invention, the flow and temperature conditions on the hot side of the passive exhaust heat exchanger are achieved through a steam boiler and a regulating valve.

[0054] In the above embodiment of the present invention, the low flow rate 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-described embodiment of the present invention, the temperature of the medium on the cold side of the passive exhaust heat exchanger is controlled by a cooling heat exchanger installed within the cooling water tank. A corresponding cooling heat exchanger is configured based on the designed heat exchange capacity of the passive exhaust heat exchanger. The heat exchange capacity of the cooling heat exchanger is adjusted based on the temperature measurement conditions installed within the cooling water tank. If necessary, multiple cooling heat exchangers can be dispersed on both sides of the water tank to achieve stable temperature control of the medium within the cooling water tank. The cooling water tank is coated with thermal insulation material to reduce external heat dissipation and enhance the effectiveness of stable temperature control of the medium within the cooling water tank.

[0056] The technical solutions described in the embodiments of this application can be combined arbitrarily unless there is any conflict.

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

Claims

1. A thermal testing 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), 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); 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 output end and the input end of the passive waste heat exchanger (1) are respectively connected to the first temperature sensor (18) and the second temperature sensor (19); 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 output end and the input end of the cooling water tank cooler (6) are connected to the pipelines with the fourth temperature sensor (21) and the third temperature sensor (20) respectively. 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 testing 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 capacity of the steam boiler (2) is more than twice the rated steam flow rate of the passive exhaust heat exchanger (1).

3. The thermal testing 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 testing device for a 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 a 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: During the test and assessment of the passive exhaust heat exchanger (1), the commissioning is first carried out 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 residual 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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