Generator stator cooling water system and air accumulation prevention system thereof

Abstract

The utility model relates to a generator stator cooling water system and an anti-air-accumulation system thereof, the generator stator cooling water system comprises a plurality of water pumps used for driving cooling water, and the anti-air-accumulation system comprises a plurality of anti-air-accumulation assemblies in one-to-one correspondence with the plurality of water pumps; each air accumulation prevention assembly comprises a check valve, the first end of the check valve is connected to an outlet of the water pump through an output pipeline, and the check valve is used for preventing cooling water from flowing back to the outlet of the water pump; the water outlet on-off mechanism is connected with the second end of the check valve and used for conducting or cutting off cooling water from the check valve; the gas collecting mechanism is arranged on the output pipeline, the highest point of the gas collecting mechanism is higher than the check valve, and the gas collecting mechanism is used for collecting gas permeating into the output pipeline from the check valve; and the exhaust mechanism is connected with the highest point of the gas collection mechanism and is used for exhausting the accumulated gas gathered in the gas collection mechanism. According to the utility model, accumulated gas accumulated after the water pump of the generator stator cooling water system is stopped can be efficiently discharged, and the operation stability of a nuclear power plant is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of generators in nuclear power plants, and particularly relates to a generator stator cooling water system and an anti-gas accumulation system thereof. Background Technique

[0002] Since hydrogen will inevitably dissolve into the generator stator cooling water system, when the water pump in the generator stator cooling water system stops running, the gas accumulation at the outlet of the water pump cannot be discharged. After investigation, it is found that the flange sealing surface of the valve (such as a check valve, etc.) arranged at the output end of the water pump cannot achieve absolute sealing. Therefore, due to Fick's diffusion law, concentration difference permeation will inevitably occur, causing gas to slowly penetrate into the pipeline. The existence of gas accumulation will affect the heat dissipation efficiency of the generator stator cooling water system and is not conducive to the safe operation of the nuclear power plant. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a generator stator cooling water system and an anti-gas accumulation system thereof.

[0004] The utility model solves the technical problem by constructing an anti-gas accumulation system for the generator stator cooling water system. The generator stator cooling water system includes several water pumps for driving cooling water, and the anti-gas accumulation system includes several anti-gas accumulation components corresponding to the several water pumps one by one;

[0005] Each of the anti-gas accumulation components includes:

[0006] A check valve, the first end of the check valve is connected to the outlet of the water pump through an output pipeline, and is used to prevent the cooling water from flowing back to the outlet of the water pump;

[0007] An outlet on-off mechanism, connected to the second end of the check valve, and is used to conduct or cut off the cooling water from the check valve;

[0008] A gas collecting mechanism, arranged on the output pipeline, and the highest point of the gas collecting mechanism is higher than the check valve, and is used to gather the gas that penetrates into the output pipeline from the check valve; and

[0009] An exhaust mechanism, connected to the highest point of the gas collecting mechanism, and is used to discharge the accumulated gas in the gas collecting mechanism.

[0010] Preferably, the outlet on-off mechanism includes a first isolation valve, the first end of the first isolation valve is connected to the second end of the check valve, and the second end of the first isolation valve is used to output cooling water.

[0011] Preferably, a part of the pipeline in the output pipeline is in a convex shape, a triangular shape or a trapezoidal shape to form the gas collecting mechanism.

[0012] Preferably, the first isolation valve and the check valve are arranged on a horizontal pipeline.

[0013] Preferably, the exhaust mechanism includes an exhaust valve. The first end of the exhaust valve is connected to the highest point of the gas collecting mechanism, and the second end of the exhaust valve is used for discharging the accumulated gas.

[0014] Preferably, the control end of the exhaust valve is also electrically connected to the outlet of the water pump to receive a control signal that can control the closing of the exhaust valve when the water pump starts and control the opening of the exhaust valve when the water pump is in operation.

[0015] Preferably, each anti-gas accumulation component further includes a drainage mechanism. The first end of the drainage mechanism is connected to the first end of the check valve, and the second end of the drainage mechanism is used for discharging the cooling water in the output pipeline.

[0016] Preferably, each anti-gas accumulation component further includes:

[0017] An inlet channel mechanism, which is connected to the inlets of the several water pumps one by one and is used for conducting or cutting off the cooling water input to the several water pumps.

[0018] The present utility model also constructs a generator stator cooling water system for a generator. The generator stator cooling water system includes:

[0019] Several water pumps for driving the cooling water; and

[0020] The above-mentioned anti-gas accumulation system, which is connected between the several water pumps and the cooling water inlet of the generator.

[0021] Preferably, the generator stator cooling water system further includes:

[0022] A high-level water tank, whose horizontal position is higher than that of the anti-gas accumulation system and is connected to the several water pumps for supplementing cooling water to the several water pumps; and

[0023] A return water exhaust tank, which is connected between the several water pumps and the outlet of the generator and is used for treating the cooling water discharged from the outlet of the generator.

[0024] Implementing the present utility model has the following beneficial effects: After the water pumps in the generator stator cooling water system are shut down, the air infiltrating into the pipeline is gathered at a relatively high position by the gas collecting mechanism, and then the accumulated gas in the gas collecting mechanism is removed by using the exhaust mechanism, which helps to better exhaust all the accumulated gas and has the advantages of good exhaust gas accumulation effect and simple structure. Description of the Drawings

[0025] The present utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0026] Figure 1 is a schematic structural view of the generator stator cooling water system in some embodiments of the present utility model;

[0027] Figure 2 is a schematic structural view of the gas collecting mechanism in some embodiments of the present utility model;

[0028] Figure 3 is a schematic structural view of the check valve and the switch valve of the generator stator cooling water system in some embodiments. Specific Embodiments

[0029] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described in detail with reference to the accompanying drawings.

[0030] In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings and are constructed and operated in a specific orientation. This is only for the convenience of describing the technical solution and does not indicate that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation of the present utility model.

[0031] Please refer to Figure 1 , the present utility model provides an anti-gas accumulation system, which is applied to the generator stator cooling water system and can efficiently discharge the accumulated gas after the water pump of the generator stator cooling water system stops operating, helping to improve the operation stability of the nuclear power plant.

[0032] As Figure 1 shown, the generator stator cooling water system includes several water pumps 1 for driving cooling water. The anti-gas accumulation system can include several anti-gas accumulation components 2 corresponding to the several water pumps 1 one by one. To meet the redundancy criterion, the generator stator cooling water system generally configures multiple water pumps 1 to avoid the failure of the generator stator cooling water system caused by the failure of an individual water pump 1. Correspondingly, the number of anti-gas accumulation components 2 that the anti-gas accumulation system can include is the same as the number of water pumps 1 and forms a one-to-one correspondence, so that each water pump 1 can use the corresponding anti-gas accumulation component 2 to discharge the accumulated gas after it stops operating, and improve the reliability of the anti-gas accumulation system when the water pump is started.

[0033] Please refer to Figure 1 , each anti-gas accumulation component 2 can include a check valve 21, a water outlet on-off mechanism 22, a gas collecting mechanism 23, and an exhaust mechanism 24.

[0034] Please refer to Figure 1, the first end of the check valve 21 is connected to the outlet of the water pump 1 through the output pipeline 3, and the check valve 21 is used to prevent the cooling water from flowing back to the outlet of the water pump 1.

[0035] Please refer to Figure 1 , the water outlet on-off mechanism 22 is connected to the second end of the check valve 21, and the water outlet on-off mechanism 22 is used to conduct or cut off the cooling water from the check valve 21.

[0036] In some embodiments, such as Figure 1 shown, the water outlet on-off mechanism 22 includes a first isolation valve. The first end of the first isolation valve is connected to the second end of the check valve 21, and the second end of the first isolation valve is used to output cooling water when the first isolation valve is conducted. Among them, the first isolation valve can be an existing electric valve or a manual valve.

[0037] Please refer to Figure 1 , the gas collecting mechanism 23 is arranged on the output pipeline 3, and the highest point of the gas collecting mechanism 23 is higher than the check valve 21, and is used to gather the gas that penetrates from the check valve 21 into the output pipeline 3.

[0038] In some embodiments, such as Figure 2 shown, part of the pipeline in the output pipeline 3 is in a convex shape, a triangular shape or a trapezoidal shape to form the gas collecting mechanism 23. Specifically, please refer to Figure 2 , the gas collecting mechanism 23 can be in a convex shape, a triangular shape or a trapezoidal shape respectively. Of course, the gas collecting mechanism 23 can also be a structure of other shapes, as long as it can form a pipeline structure with a raised highest point and is convenient for collecting accumulated gas. It can be understood that, please refer to Figure 1 , when the water outlet on-off mechanism 22 or the first isolation valve is cut off, the gas that penetrates from the check valve 21 into the output pipeline 3 will gather towards the top of the pipeline, and the raised pipeline structure can better gather the gas in the pipeline and gather the gas at the raised part.

[0039] The check valve and the switch valve for controlling the on-off of the water pump outlet in the generator stator cooling water system of some nuclear power plants are as Figure 3 shown, the check valve 100 and the switch valve 200 are arranged on a vertical pipeline. When the switch valve 200 is cut off, the gas that penetrates from the check valve 100 will flow upwards, resulting in gathering in the pipeline between the switch valve 200 and the check valve 100. And it is quite difficult to completely discharge this part of the accumulated gas, which is likely to cause the degradation of the heat dissipation performance of the generator stator cooling water system. In some embodiments, such as Figure 1 shown, the water outlet on-off mechanism 22 (i.e., the first isolation valve) and the check valve 21 are arranged on a horizontal pipeline. It can be understood that, since the highest point of the gas collecting mechanism 23 is higher than the check valve 21, and the water outlet on-off mechanism 22 and the check valve 21 are arranged on a horizontal pipeline, and because the gas in the pipeline has the characteristic of flowing upwards, the accumulated gas will preferentially gather in the gas collecting mechanism 23.

[0040] Please refer to Figure 1 , the exhaust mechanism 24 is connected to the highest point of the gas collecting mechanism 23, and the exhaust mechanism 24 is used to discharge the accumulated gas in the gas collecting mechanism 23.

[0041] In some embodiments, as Figure 1 shown, the exhaust mechanism 24 includes an exhaust valve. The first end of the exhaust valve is connected to the highest point of the gas collecting mechanism 23, and the second end of the exhaust valve is used to discharge the accumulated gas. Since the accumulated gas may contain flammable gases (such as hydrogen), to avoid potential safety hazards caused by the discharged accumulated gas, the second end of the exhaust valve can be connected to the return water exhaust tank 5 in the generator stator cooling water system, and then the accumulated gas can be processed through the return water exhaust tank 5 to avoid directly discharging the accumulated gas into the air.

[0042] To avoid potential water leakage hazards of the exhaust valve when the water pump 1 starts, in some embodiments, as Figure 1 shown, the control end of the exhaust valve is also electrically connected to the outlet of the water pump 1 to receive a control signal that can control the exhaust valve to close when the water pump 1 starts and control the exhaust valve to open when the water pump 1 is in operation. Specifically, the control signal of the exhaust valve can be associated with the control signal of the water pump 1. For example, the exhaust valve conducts after receiving a high level or an input voltage is applied and cuts off after receiving a low level or no input voltage is applied, while the water pump 1 starts after receiving a high level or an input voltage is applied and stops operating after receiving a low level or no input voltage is applied. Then, an existing inverter or inverter circuit can be connected in series between the control end of the water pump 1 and the control end of the exhaust valve to achieve the staggered start effect of the exhaust valve and the water pump 1. Of course, if the exhaust valve cuts off after receiving a high level or an input voltage is applied and conducts after receiving a low level or no input voltage is applied, then the control end of the water pump 1 can be directly electrically connected to the control end of the exhaust valve, so as to achieve the staggered start effect of the exhaust valve and the water pump 1.

[0043] Since the generator stator cooling water system may need to drain the cooling water in the pipeline during major repairs or failures, etc., in some embodiments, as Figure 1 shown, each anti-accumulated gas component 2 further includes a drainage mechanism 25. The first end of the drainage mechanism 25 is connected to the first end of the check valve 21, and the second end of the drainage mechanism 25 is used to discharge the cooling water in the output pipeline 3. Among them, the drainage mechanism 25 can include a second isolation valve. The first end of the second isolation valve is connected to the first end of the check valve 21, and the second end of the second isolation valve is used to discharge the cooling water in the output pipeline 3.

[0044] In some embodiments, as Figure 1As shown, each anti-air accumulation component 2 may further include a water inlet channel mechanism 26. The water inlet channel mechanism 26 is connected to the inlets of a plurality of water pumps 1 one by one, and is used to conduct or cut off the cooling water input to the plurality of water pumps 1. Among them, the water inlet channel mechanism 26 includes a third isolation valve. The first end of each third isolation valve can be connected to the return water exhaust tank 5 to obtain the cooling water processed by the return water exhaust tank 5. The second end of each third isolation valve is connected to the inlet of the corresponding water pump 1 to supply cooling water to the corresponding water pump 1 when the third isolation valve is conducted.

[0045] The technical solution of the present utility model accumulates the air that penetrates into the pipeline after the water pump in the generator stator cooling water system is shut down through the air accumulation mechanism at a relatively high position, and then uses the exhaust mechanism to exhaust the accumulated air in the air accumulation mechanism, which helps to better exhaust the accumulated air, and has the advantages of good air exhaust effect and simple structure.

[0046] As Figure 1 shown, the present utility model also provides a generator stator cooling water system, which is used to dissipate heat from the stator of the generator. The generator stator cooling water system may include the anti-air accumulation system provided by the embodiments of the present utility model, and a plurality of water pumps 1. Among them, the water pump 1 is used to drive the cooling water. The anti-air accumulation system is connected between the plurality of water pumps 1 and the cooling water inlet of the generator.

[0047] In some embodiments, as Figure 1 shown, the generator stator cooling water system may further include a high-level water tank 4 and a return water exhaust tank 5. The horizontal position of the high-level water tank 4 is higher than that of the anti-air accumulation system. The high-level water tank 4 is connected to the plurality of water pumps 1 and is used to supplement cooling water to the plurality of water pumps 1. The return water exhaust tank 5 is connected between the plurality of water pumps 1 and the outlet of the generator to process the cooling water discharged from the outlet of the generator. The return water exhaust tank 5 is also connected to the exhaust valve included in the anti-air accumulation system to process the accumulated air discharged by the exhaust valve.

[0048] In some embodiments, as Figure 1 shown, the generator stator cooling water system may further include a first pressure test unit 61 and a second pressure test unit 62. The first pressure test unit 61 is connected to the cooling water inlet of the generator to measure the pressure of the cooling water input to the generator. The second pressure test unit 62 is connected to the cooling water outlet of the return water exhaust tank 5 to measure the pressure of the cooling water output by the return water exhaust tank 5, so as to facilitate the user to control the rotation speed of the water pump 1 and / or the opening degree of the water outlet on-off mechanism 22 according to the pressure of the cooling water output by the return water exhaust tank 5 and the pressure of the cooling water at the cooling water inlet of the generator.

[0049] It can be understood that the above embodiments only express the preferred embodiments of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. An anti-gas accumulation system for a generator stator cooling water system, the generator stator cooling water system comprising a plurality of water pumps (1) for driving cooling water, characterized in that, The anti-gas accumulation system includes a number of anti-gas accumulation components (2) corresponding one-to-one to the number of water pumps (1); Each of the anti-gas accumulation components (2) includes: A check valve (21), the first end of the check valve (21) is connected to the outlet of the water pump (1) through an output pipeline (3), and is used to prevent the cooling water from flowing back to the outlet of the water pump (1); An outlet on-off mechanism (22), connected to the second end of the check valve (21), and is used to conduct or cut off the cooling water from the check valve (21); A gas accumulation mechanism (23), arranged on the output pipeline (3), and the highest point of the gas accumulation mechanism (23) is higher than the check valve (21), and is used to accumulate the gas that penetrates into the output pipeline (3) from the check valve (21); and An exhaust mechanism (24), connected to the highest point of the gas accumulation mechanism (23), and is used to discharge the accumulated gas in the gas accumulation mechanism (23).

2. The anti-gas accumulation system according to claim 1, wherein The outlet on-off mechanism (22) includes a first isolation valve, the first end of the first isolation valve is connected to the second end of the check valve (21), and the second end of the first isolation valve is used to output the cooling water.

3. The anti-gas accumulation system according to claim 2, characterized in that, Part of the pipeline in the output pipeline (3) is in a convex shape, triangular shape or trapezoidal shape to form the gas accumulation mechanism (23).

4. The anti-gas accumulation system according to claim 2, wherein The first isolation valve and the check valve (21) are arranged on a horizontal pipeline.

5. The anti-gas accumulation system according to claim 1, wherein The exhaust mechanism (24) includes an exhaust valve, the first end of the exhaust valve is connected to the highest point of the gas accumulation mechanism (23), and the second end of the exhaust valve is used to discharge the accumulated gas.

6. The anti-gas accumulation system according to claim 5, characterized in that The control end of the exhaust valve is also electrically connected to the outlet of the water pump (1) to receive a control signal that can control the exhaust valve to close when the water pump (1) starts and control the exhaust valve to open when the water pump (1) is in operation.

7. The anti-gas accumulation system according to any one of claims 1 to 6, characterized in that, Each of the anti-gas accumulation components (2) further includes a drainage mechanism (25), the first end of the drainage mechanism (25) is connected to the first end of the check valve (21), and the second end of the drainage mechanism (25) is used to discharge the cooling water in the output pipeline (3).

8. The anti-gas accumulation system according to claim 7, wherein Each of the anti-gas accumulation components (2) further includes: An inlet channel mechanism (26), connected to the inlets of the number of water pumps (1) one-to-one, and is used to conduct or cut off the cooling water input to the number of water pumps (1).

9. A generator stator cooling water system for a generator, characterized in that, The generator stator cooling water system includes: A number of water pumps (1), used to drive the cooling water; and The anti-gas accumulation system according to any one of claims 1 to 7, connected between the number of water pumps (1) and the cooling water inlet of the generator.

10. The generator stator cooling water system according to claim 9, characterized in that, The generator stator cooling water system further includes: A high-level water tank (4), with a horizontal position higher than the anti-gas accumulation system, connected to the number of water pumps (1), and is used to supplement the cooling water to the number of water pumps (1); and A return water exhaust tank (5), connected between the number of water pumps (1) and the outlet of the generator, and is used to process the cooling water discharged from the outlet of the generator.

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