Cooling system for nuclear main pump test bed system in severe low-temperature environment

Abstract

The utility model provides a cooling system for a nuclear main pump test bed system in a severe low-temperature environment, which can effectively prevent the problem of freezing of an air cooler in the severe low-temperature environment. The indoor cooling loop comprises a cooling water tank, a water outlet pipeline and a water inlet pipeline, the water outlet pipeline is used for being connected with a water inlet of the nuclear main pump test bed system, the water outlet pipeline is connected with an outlet of the cooling water tank, and the water inlet pipeline is used for being connected with a water outlet of the nuclear main pump test bed system; the outdoor cooling loop comprises an air cooler; the water inlet pipeline is connected with a hot fluid inlet of the plate heat exchanger; a hot fluid outlet of the plate heat exchanger is connected with an inlet of the cooling water tank; the outdoor cooling loop further comprises an ethylene glycol circulating pump and an ethylene glycol storage tank; an inlet of the ethylene glycol circulating pump is connected with an outlet of the ethylene glycol storage tank; an outlet of the ethylene glycol circulating pump is connected with a cold fluid inlet of the plate heat exchanger; a cold fluid outlet of the plate heat exchanger is connected with an inlet of the air cooler, and an outlet of the air cooler is connected with an inlet of the ethylene glycol storage tank.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of cooling systems for nuclear main pump test bench system under harsh low temperature environment. BACKGROUND

[0002] Nuclear main pump test bench system is a facility for testing the performance of nuclear main pump, durability test and other tests. During the test, the nuclear main pump needs to simulate various operating conditions in the actual nuclear power plant, including full power operation, partial power operation, start-up and shutdown processes. These test conditions require high precision and may generate varying degrees of heat in the nuclear main pump. For example, when testing the hydraulic performance of the nuclear main pump, the temperature and other parameters need to be accurately controlled, because temperature changes may affect the density, viscosity and other physical properties of the coolant, thereby affecting the accuracy of the test results. Therefore, the cooling system must be able to operate stably to ensure the smooth progress of the test. However, under harsh outdoor temperatures of -40°C, the heat exchange elements of the air cooler in the cooling system are prone to freezing when the system is shut down in winter, causing damage to the cooling system and affecting the nuclear main pump test bench system. SUMMARY

[0003] The utility model aims at overcoming the above-mentioned deficiencies in the prior art and providing a cooling system for nuclear main pump test bench system under harsh low temperature environment, which can effectively prevent the freezing problem of the air cooler under low temperature harsh environment.

[0004] The utility model discloses the technical scheme adopted to solve the above-mentioned problems: a cooling system for nuclear main pump test bench system under harsh low temperature environment, comprising an indoor cooling circuit and an outdoor cooling circuit; the indoor cooling circuit comprises a cooling water tank, an outlet pipe and an inlet pipe, the outlet pipe is used to connect the water inlet of the nuclear main pump test bench system, the outlet pipe is connected with the outlet of the cooling water tank, and the inlet pipe is used to connect the water outlet of the nuclear main pump test bench system; the outdoor cooling circuit comprises an air cooler; characterized in that: the indoor cooling circuit further comprises a plate heat exchanger, the inlet pipe is connected with the hot fluid inlet of the plate heat exchanger, and the hot fluid outlet of the plate heat exchanger is connected with the inlet of the cooling water tank; the outdoor cooling circuit further comprises a glycol circulating pump and a glycol storage tank; the outlet of the glycol storage tank is connected with the inlet of the glycol circulating pump, and the outlet of the glycol circulating pump is connected with the cold fluid inlet of the plate heat exchanger; the cold fluid outlet of the plate heat exchanger is connected with the inlet of the air cooler, and the outlet of the air cooler is connected with the inlet of the glycol storage tank.

[0005] The utility model is provided with a valve on the outlet pipe.

[0006] The hot fluid outlet of the plate heat exchanger is connected with the inlet of the cooling water tank through a valve.

[0007] The utility model discloses a Y type filter and the third valve are arranged between the import of ethylene glycol circulating pump and the export of ethylene glycol storage tank, and the import of ethylene glycol circulating pump is connected with the export of ethylene glycol storage tank through the Y type filter and the third valve.

[0008] The utility model discloses a one-way valve is arranged between the export of ethylene glycol circulating pump and the cold fluid import of plate heat exchanger, and the export of ethylene glycol circulating pump is connected with the cold fluid import of plate heat exchanger through the one-way valve.

[0009] The utility model discloses a bypass regulating valve is connected in parallel on the import and export of ethylene glycol circulating pump.

[0010] The utility model discloses the cold fluid export of plate heat exchanger is connected with the import of air cooler through the fourth valve.

[0011] The utility model discloses the export of air cooler is connected with the import of ethylene glycol storage tank through the fifth valve.

[0012] Compared with the prior art, the utility model has the following advantages and effects: the ethylene glycol working medium process route is adopted to replace the conventional cooling working medium process route, the capacity of each single equipment in the cooling system is matched according to the corresponding physical property parameter calculation, the plate heat exchanger is added in the room to carry out the secondary heat exchange process route, and the freezing problem of the air cooler in the low-temperature harsh environment can be effectively prevented by adopting the ethylene glycol solution to circulate the plate heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structure schematic diagram of the utility model embodiment.

[0014] Figure 2 It is the local structure schematic diagram of the utility model embodiment. CONCRETE IMPLEMENTING METHOD

[0015] The utility model will be further explained in detail in combination with the drawings and through the embodiment, and the following embodiment is the explanation of the utility model, and the utility model is not limited to the following embodiment.

[0016] The utility model embodiment includes indoor cooling circuit and outdoor cooling circuit.

[0017] The indoor cooling circuit is mainly used for reducing equipment cooling water temperature, and controls the equipment cooling water in the design range, and it includes cooling water tank 3, plate heat exchanger 1, water outlet pipeline 15 and water inlet pipeline 16.

[0018] The water outlet pipeline 15 is used for connecting the water inlet of the nuclear main pump test bench system, the water outlet pipeline 15 is connected with the outlet of the cooling water tank 3, and a first valve 4 is arranged on the water outlet pipeline 15.

[0019] The working medium of the indoor cooling circuit is deionized water, which is pure and stable, and will not cause adverse effects on the system due to impurities or ion concentration changes in the water. When the cooling water system is running, its performance will not fluctuate greatly due to water quality fluctuations.

[0020] The outdoor cooling circuit mainly transmits heat in the indoor cooling circuit to the air cooler 13 outside through the plate heat exchanger 1, and then dissipates the heat to the atmosphere through the air cooler, including the ethylene glycol circulating pump 8, the ethylene glycol storage tank 5 and the air cooler 13.

[0021] A Y-type filter 7 and a third valve 6 are arranged between the inlet of the ethylene glycol circulating pump 8 and the outlet of the ethylene glycol storage tank 5, and the inlet of the ethylene glycol circulating pump 8 is connected to the outlet of the ethylene glycol storage tank 5 through the Y-type filter 7 and the third valve 6; a size head 9 and a check valve 11 are arranged between the outlet of the ethylene glycol circulating pump 8 and the cold fluid inlet of the plate heat exchanger 1, and the outlet of the ethylene glycol circulating pump 8 is connected to the cold fluid inlet of the plate heat exchanger 1 through the size head 9 and the check valve 11. The inlet and outlet of the ethylene glycol circulating pump 8 are connected in parallel with a bypass regulating valve 10, and the heat exchange efficiency of the plate heat exchanger can be controlled by adjusting the bypass regulating valve 10. The cold fluid outlet of the plate heat exchanger 1 is connected to the inlet of the air cooler 13 through a fourth valve 12, and the outlet of the air cooler 13 is connected to the inlet of the ethylene glycol storage tank 5 through a fifth valve 14.

[0022] The working medium of the outdoor cooling circuit is ethylene glycol solution, which is composed of 57% ethylene glycol, 42% water and 1% additive. Ethylene glycol can effectively prevent the freezing of the cooling liquid in cold weather conditions or cooling systems that require low temperature environments, ensuring the continuous and stable operation of the cooling system and avoiding problems such as pipe expansion, equipment damage and other problems caused by freezing of the cooling liquid. Using ethylene glycol solution to circulate the plate heat exchanger 1 can effectively prevent the freezing problem of the closed air cooler in a low temperature and harsh environment.

[0023] The working process of the utility model is as follows:

[0024] The cooling water of the nuclear main pump test bench system enters the plate heat exchanger 1 through the water inlet pipeline 16 to be cooled, and after being reduced to a specified outlet temperature, enters the cooling water tank 3 through the second valve 2 to be stored, and when used, the first valve 4 can be opened to release the cooling water, which enters the nuclear main pump test bench system through the water outlet pipeline 15 to be cooled. Temperature instruments are arranged at the inlet and outlet of the plate heat exchanger 1 according to the need, and temperature instruments can be additionally arranged at both ends of the air cooler 13.

[0025] The ethylene glycol storage tank 5 sends the ethylene glycol solution to the plate heat exchanger 1 by the ethylene glycol circulating pump 8 to cool the cooling water, and the ethylene glycol solution can accelerate the heat exchange efficiency of the plate heat exchanger 1. The ethylene glycol solution that has passed through the plate heat exchanger 1 is cooled in the air cooler 13 and then returns to the ethylene glycol storage tank 5 through the gate valve 14. Thus, the entire cooling circulation system is completed.

[0026] The technical parameters of the plate heat exchanger 1 on the indoor cooling circuit side are shown in Table 1.

[0027] Table 1.

[0028]

[0029] The technical parameters of the air cooler 13 on the outdoor cooling circuit side are shown in Table 2, and the technical parameters of the plate heat exchanger 1 on the outdoor cooling circuit side are shown in Table 3.

[0030] Table 2.

[0031]

[0032] Table 3.

[0033]

[0034] In addition, it should be noted that the specific embodiments described in the specification, the shape of the zero, the components, the name taken, etc. can be different, and the above described in the specification is only an example of the structure of the utility model. Any equivalent changes or simple changes made according to the structure, features and principles described in the utility model patent concept are included in the protection scope of the utility model patent. The person skilled in the art of the utility model can make various modifications or supplements or adopt similar ways to replace the described specific embodiments, as long as it does not deviate from the structure of the utility model or exceed the range defined in the claims, which shall belong to the protection scope of the utility model.

Claims

1. A cooling system for a nuclear main pump test bed system in a severe low-temperature environment, comprising an indoor cooling circuit and an outdoor cooling circuit; the indoor cooling circuit comprises a cooling water tank, an outlet water pipeline and an inlet water pipeline, the outlet water pipeline is used for connecting an inlet of the nuclear main pump test bed system, the outlet water pipeline is connected with an outlet of the cooling water tank, and the inlet water pipeline is used for connecting an outlet of the nuclear main pump test bed system; the outdoor cooling circuit comprises an air cooler; characterized in that: The indoor cooling circuit further comprises a plate heat exchanger, the water inlet pipeline is connected with a hot fluid inlet of the plate heat exchanger, a hot fluid outlet of the plate heat exchanger is connected with an inlet of the cooling water tank; the outdoor cooling circuit further comprises a glycol circulating pump and a glycol storage tank; an outlet of the glycol storage tank is connected with an inlet of the glycol circulating pump, an outlet of the glycol circulating pump is connected with a cold fluid inlet of the plate heat exchanger; a cold fluid outlet of the plate heat exchanger is connected with an inlet of the air cooler, an outlet of the air cooler is connected with an inlet of the glycol storage tank.

2. The cooling system for the test rig of the nuclear main pump in severe low-temperature environment according to claim 1, characterized in that: A first valve is arranged on the water outlet pipeline.

3. The cooling system for the test rig of the nuclear main pump in severe low-temperature environment according to claim 1, characterized in that: The hot fluid outlet of the plate heat exchanger is connected with the inlet of the cooling water tank through a second valve.

4. The cooling system for the test rig of the nuclear main pump in severe low-temperature environment according to claim 1, characterized in that: A Y-type filter and a third valve are arranged between the inlet of the glycol circulating pump and the outlet of the glycol storage tank, the inlet of the glycol circulating pump is connected with the outlet of the glycol storage tank through the Y-type filter and the third valve.

5. The cooling system for the test rig of the nuclear main pump in severe low-temperature environment according to claim 1, characterized in that: A one-way valve is arranged between the outlet of the glycol circulating pump and the cold fluid inlet of the plate heat exchanger, the outlet of the glycol circulating pump is connected with the cold fluid inlet of the plate heat exchanger through the one-way valve.

6. The cooling system for the test rig of the nuclear main pump in severe low-temperature environment according to claim 1, characterized in that: A bypass regulating valve is connected in parallel with the inlet and outlet of the glycol circulating pump.

7. The cooling system for the test rig of the nuclear main pump in severe low-temperature environment according to claim 1, characterized in that: The cold fluid outlet of the plate heat exchanger is connected with the inlet of the air cooler through a fourth valve.

8. The cooling system for the test rig of the nuclear main pump in severe low-temperature environment according to claim 1, characterized in that: The outlet of the air cooler is connected with the inlet of the glycol storage tank through a fifth valve.

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