Three-flow-ring seal oil system flushing device and method

Abstract

The present invention discloses a flushing device and method for a three - flow - ring seal oil system. The flushing device for the three - flow - ring seal oil system includes two groups of five - valve sets, a three - way valve set, and a flushing and filtering unit; the five - valve set includes a main pipeline and the first valve to the fifth valve connected in parallel to the main pipeline; the three - way valve set includes the first three - way valve to the fifth three - way valve; the flushing and filtering unit is connected between the air - side return oil pipe and the air - side oil tank, and the flushing and filtering unit is provided with five parallel interfaces, and the first three - way valve to the fifth three - way valve are respectively bypassed to the five interfaces. The flushing device for the three - flow - ring seal oil system of the present invention installs each valve set and the flushing and filtering unit at one time before the system flushing. During the flushing process, the flushing circuit is directly switched by valve switching, without disassembling and assembling pipelines and valves, saving oil, reducing the risk of oil leakage, and reducing oil pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant commissioning and operation, and particularly to a flushing device and method for a three-flow ring seal oil system. Background Art

[0002] The three-flow ring seal oil system (GHE) is divided into three loops: the air-side seal oil loop, the vacuum-side seal oil loop, and the hydrogen-side seal oil loop. Its system pipelines are also divided into two parts: pumps, valves, filters, and connected pipelines, etc. are manufactured and integrated into components in the factory, and the pipelines connecting the integrated components to the generator seal tile are installed in the power plant and called external pipelines.

[0003] The flow rate of the air-side pump > the flow rate of the hydrogen-side pump > the flow rate of the vacuum-side pump. The flow rates of the hydrogen-side pump and the vacuum-side pump are relatively small. To ensure the flushing effect, the hydrogen-side pump and the vacuum-side pump cannot be directly used to flush their corresponding external pipelines (the external pipelines are long and fabricated on-site, and are generally considered to be "dirtier"). The existing three-flow ring seal oil systems in power plants are as Figure 1 shown. The loops and steps that need to be flushed are as follows: 1. Start the air-side pumps 2115 / 2125PO to flush the air-side loop; 2. Start the accumulator charging pumps 1235 / 1245PO to flush the accumulator loop; 3. Flush the pipelines inside the vacuum-side loop assembly; 4. Flush the external pipelines of the vacuum-side loop; 5. Flush the supply oil pipeline of the external pipeline of the hydrogen-side loop; 6. Flush the return oil pipeline of the external pipeline of the hydrogen-side loop; 7. Flush the pipelines inside the non-driving-end hydrogen-side loop assembly; 8. Flush the pipelines inside the driving-end hydrogen-side loop assembly.

[0004] Due to the large number of system loops and complex composition, when flushing the system, it is necessary to comprehensively flush the pipelines inside and outside the assembly in 8 loops. Before each flushing, a temporary flushing device needs to be installed, and after flushing, it is removed and switched to a new flushing loop for flushing. This takes a long time, the number of times of disassembling and installing pipelines is large, the risk of oil leakage is high, some oil waste will inevitably be caused during the process of disassembling and installing pipelines, and it also consumes a lot of manpower and time. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a flushing device and a flushing method for a three-flow ring seal oil system that can ensure the flushing effect without the need to disassemble and install pipelines, valves, etc. multiple times.

[0006] The technical solution adopted by the present invention to solve its technical problem is: to provide a flushing device for a three-flow ring seal oil system, including two groups of five-valve assemblies, three-way valve assemblies, and flushing and filtering units corresponding to both sides of the generator;

[0007] The five-valve group includes a main pipeline, and the first to fifth valves are connected in parallel to the main pipeline. The first valve and the second valve are respectively connected to the air-side return oil pipe and the air-side inlet oil pipe. The third valve is connected to the vacuum-side inlet oil pipe. The fourth valve and the fifth valve are respectively connected to the hydrogen-side supply oil pipe and the hydrogen-side return oil pipe;

[0008] The three-way valve group includes the first to fifth three-way valves. The first three-way valve is arranged on the external pipeline on the vacuum side. The second three-way valve and the third three-way valve are respectively arranged on the external pipelines on the hydrogen side at the driving end. The fourth three-way valve and the fifth three-way valve are arranged on the external pipelines on the hydrogen side at the non-driving end;

[0009] The flushing and filtering unit is connected between the air-side return oil pipe and the air-side oil tank. The flushing and filtering unit is provided with five parallel interfaces, and the first to fifth three-way valves are respectively bypassed to the five interfaces.

[0010] Preferably, the flushing and filtering unit includes a filtering component, a first flushing pipeline connected between the inlet end of the filtering component and the air-side return oil pipe, and a second flushing pipeline connected between the outlet end of the filtering component and the air-side oil tank; the five interfaces are connected in parallel to the first flushing pipeline, and a stop valve is arranged on the first flushing pipeline.

[0011] Preferably, the filtering component includes two filters arranged in parallel; the inlet ends of the two filters are connected to the first flushing pipeline through an inlet three-way valve and an isolation valve; the outlet ends of the two filters are connected to the second flushing pipeline through an outlet three-way valve.

[0012] Preferably, in the two groups of the five-valve groups, the fourth valve and the fifth valve of one group of the five-valve groups are respectively connected to the hydrogen-side supply oil pipe and the hydrogen-side return oil pipe at the driving end, and the fourth valve and the fifth valve of the other group of the five-valve groups are respectively connected to the hydrogen-side supply oil pipe and the hydrogen-side return oil pipe at the non-driving end.

[0013] Preferably, an exhaust valve is installed on the main pipeline.

[0014] Preferably, the first to fifth valves are respectively stop valves.

[0015] The present invention also provides a flushing method for a three-flow ring seal oil system, using the flushing device for a three-flow ring seal oil system described in any one of the above. The flushing method for the three-flow ring seal oil system includes an air-side loop flushing, a vacuum-side loop flushing, and a hydrogen-side loop flushing.

[0016] Preferably, the air-side loop flushing includes the following steps:

[0017] S1.1. Open the first valve and the second valve, and keep the third to fifth valves closed;

[0018] S1.2. Start the air-side pump to pump out the dielectric oil in the air-side oil tank. The dielectric oil flows through the air-side inlet pipe, the second valve, the first valve, and the air-side return pipe in sequence, and then enters the flushing and filtering unit from the air-side return pipe.

[0019] S1.3. After being filtered by the flushing and filtering unit, the dielectric oil flows back into the air-side oil tank.

[0020] Preferably, the vacuum-side circuit flushing includes the internal pipeline flushing of the vacuum-side integrated assembly and the external pipeline flushing of the vacuum side.

[0021] Among them, the internal pipeline flushing of the vacuum-side integrated assembly includes the following steps:

[0022] S2.1. Open the first valve and the second valve, keep the third valve to the fifth valve closed, and the first three-way valve connects the corresponding interfaces on the internal pipeline of the vacuum-side integrated assembly and the flushing and filtering unit.

[0023] S2.2. Start the air-side pump to pump out the dielectric oil in the air-side oil tank. A part of the dielectric oil enters the vacuum-side oil tank through the air-side inlet pipe, then flows through the vacuum-side oil pump and the first three-way valve and enters the flushing and filtering unit; another part of the dielectric oil enters the second valve, the first valve, and the air-side return pipe in sequence through the air-side inlet pipe, and then enters the flushing and filtering unit from the air-side return pipe.

[0024] S2.3. After being filtered by the flushing and filtering unit, the dielectric oil flows back into the air-side oil tank.

[0025] The external pipeline flushing of the vacuum side includes the following steps:

[0026] S3.1. Open the second valve and the third valve, keep the first valve, the fourth valve, and the fifth valve closed, and the first three-way valve connects the corresponding interfaces on the vacuum-side inlet pipe and the flushing and filtering unit.

[0027] S3.2. Start the air-side pump to pump out the dielectric oil in the air-side oil tank. The dielectric oil enters the second valve, the third valve, and the vacuum-side inlet pipe in sequence through the air-side inlet pipe, and then enters the flushing and filtering unit through the first three-way valve.

[0028] S3.3. After being filtered by the flushing and filtering unit, the dielectric oil flows back into the air-side oil tank.

[0029] Preferably, the hydrogen-side circuit flushing includes the external pipeline flushing of the hydrogen side; the external pipeline flushing of the hydrogen side includes the hydrogen-side supply pipe flushing and the hydrogen-side return pipe flushing.

[0030] Among them, the hydrogen-side supply pipe flushing includes the following steps:

[0031] S4.1. Open the second valve and the fourth valve, keep the first valve, the third valve and the fifth valve closed. The second three-way valve connects the hydrogen side supply oil pipe at the driving end and the corresponding interface on the flushing and filtering unit, and the fifth three-way valve connects the hydrogen side supply oil pipe at the non-driving end and the corresponding interface on the flushing and filtering unit;

[0032] S4.2. Start the air side pump to extract the medium oil in the air side oil tank. The medium oil enters the second valve and the fourth valve through the air side inlet oil pipe, and then enters the flushing and filtering unit through the hydrogen side supply oil pipe at the driving end and the second three-way valve, and the hydrogen side supply oil pipe at the non-driving end and the fifth three-way valve respectively;

[0033] S4.3. After the medium oil is filtered by the flushing and filtering unit, it flows back into the air side oil tank.

[0034] The flushing of the hydrogen side return oil pipe includes the following steps:

[0035] S5.1. Open the second valve and the fifth valve, keep the first valve, the third valve and the fourth valve closed. The third three-way valve connects the hydrogen side return oil pipe at the driving end and the corresponding interface on the flushing and filtering unit, and the fourth three-way valve connects the hydrogen side return oil pipe at the non-driving end and the corresponding interface on the flushing and filtering unit;

[0036] S5.2. Start the air side pump to extract the medium oil in the air side oil tank. The medium oil enters the second valve and the fifth valve through the air side inlet oil pipe, and then enters the flushing and filtering unit through the hydrogen side return oil pipe at the driving end and the third three-way valve, and the hydrogen side return oil pipe at the non-driving end and the fourth three-way valve respectively;

[0037] S5.3. After the medium oil is filtered by the flushing and filtering unit, it flows back into the air side oil tank.

[0038] Preferably, the flushing of the hydrogen side circuit further includes the flushing of the internal pipelines of the hydrogen side container assembly; the flushing of the internal pipelines of the hydrogen side container assembly includes the flushing of the internal pipelines of the hydrogen side container assembly at the non-driving end and the flushing of the internal pipelines of the hydrogen side container assembly at the driving end.

[0039] Among them, the flushing of the internal pipelines of the hydrogen side container assembly at the non-driving end includes the following steps:

[0040] S6.1. Open the fifth valve and the second valve in a group of five-valve assemblies that connect the hydrogen side return oil pipe at the non-driving end, keep the remaining valves and the other group of five-valve assemblies closed. The fourth three-way valve connects the hydrogen side return oil pipe at the non-driving end, and the fifth three-way valve connects the supply oil pipe inside the hydrogen side container assembly at the non-driving end and the corresponding interface on the flushing and filtering unit;

[0041] S6.2. Start the air side pump to extract the medium oil in the air side oil tank. The medium oil enters the second valve and the fifth valve through the air side inlet oil pipe, and then enters the flushing and filtering unit through the fourth three-way valve, the hydrogen side oil pump at the non-driving end and the fifth three-way valve in sequence;

[0042] After the dielectric oil is filtered by the flushing and filtering unit, it flows back into the air-side oil tank.

[0043] Preferably, the internal pipeline flushing of the driving-end hydrogen-side container assembly includes the following steps:

[0044] S7.1. Open the fifth valve and the second valve connecting the driving-end hydrogen-side return oil pipe in a set of five-valve groups, keep the remaining valves and the other set of five-valve groups closed, the third three-way valve connects the driving-end hydrogen-side return oil pipe, and the second three-way valve connects the oil supply pipe inside the driving-end hydrogen-side container assembly and the corresponding interface on the flushing and filtering unit;

[0045] S7.2. Start the air-side pump, draw out the dielectric oil in the air-side oil tank, the dielectric oil enters the second valve and the fifth valve through the air-side inlet oil pipe, and then sequentially enters the flushing and filtering unit through the third three-way valve, the driving-end hydrogen-side oil pump and the second three-way valve;

[0046] S7.3. After the dielectric oil is filtered by the flushing and filtering unit, it flows back into the air-side oil tank.

[0047] Advantages of the present invention: On the premise of ensuring the flushing effect of the three-flow ring seal oil system pipeline, all valve groups and the flushing and filtering unit are installed at one time before system flushing. During the flushing process, the flushing circuit is directly switched by valve switching, without disassembling and assembling pipelines and valves, saving oil, reducing the risk of oil leakage, and reducing oil pollution; saving the flushing construction period. Description of the Drawings

[0048] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0049] Figure 1 is a connection schematic diagram of the existing three-flow ring seal oil system;

[0050] Figure 2 is a connection schematic diagram of the three-flow ring seal oil system flushing device according to an embodiment of the present invention;

[0051] Figure 3 is a connection schematic diagram of the air-side circuit flushing in the present invention;

[0052] Figure 4 is a connection schematic diagram of the internal pipeline flushing of the vacuum-side container assembly in the present invention;

[0053] Figure 5 is a connection schematic diagram of the external pipeline flushing of the vacuum side in the present invention;

[0054] Figure 6 is a connection schematic diagram of the hydrogen-side oil supply pipe flushing in the present invention;

[0055] Figure 7It is a schematic connection diagram for flushing the hydrogen-side return oil pipe in the present invention;

[0056] Figure 8 It is a schematic connection diagram for flushing the internal pipes of the hydrogen-side integrated component at the non-driving end in the present invention;

[0057] Figure 9 It is a schematic connection diagram for flushing the internal pipes of the hydrogen-side integrated component at the driving end in the present invention. Detailed implementation manners

[0058] For a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0059] The flushing device for the three-flow ring seal oil system of the present invention is connected to the three-flow ring seal oil system and is used for flushing the three-flow ring seal oil system.

[0060] Figure 2 The flushing device for the three-flow ring seal oil system according to an embodiment of the present invention is shown, which includes two groups of five-valve assemblies, a three-way valve assembly, and a flushing and filtering unit 30.

[0061] The two groups of five-valve assemblies are respectively located on both sides of the driving end and the non-driving end of the generator. Each group of five-valve assemblies includes a main pipeline 10 and five valves connected in parallel to the main pipeline 10. Each valve can be connected through the main pipeline 10. The five valves are respectively the first valve 11 to the fifth valve 15. Among them, the first valve 11 and the second valve 12 are respectively connected to the air-side return oil pipe 103 and the air-side inlet oil pipe 102, the third valve 13 is connected to the vacuum-side inlet oil pipe 202, and the fourth valve 14 and the fifth valve 15 are respectively connected to the hydrogen-side supply oil pipe and the hydrogen-side return oil pipe.

[0062] The two groups of five-valve assemblies are arranged in a mirror image on both sides of the generator. An exhaust valve 16 is also installed on the main pipeline 10 of each five-valve assembly, which can be used for exhausting gas before or during flushing.

[0063] Among the two groups of five-valve assemblies, one group of five-valve assemblies corresponds to the driving end of the generator, and its fourth valve 14 and fifth valve 15 are respectively connected to the hydrogen-side supply oil pipe (i.e., the supply oil pipe 306 inside the hydrogen-side integrated component) and the hydrogen-side return oil pipe 303 at the driving end. The other group of five-valve assemblies corresponds to the non-driving end of the generator, and its fourth valve 14 and fifth valve 15 are respectively connected to the hydrogen-side supply oil pipe (the supply oil pipe 305 inside the hydrogen-side integrated component) and the hydrogen-side return oil pipe 304 at the non-driving end.

[0064] Optionally, in each five-valve assembly, the first valve 11 to the fifth valve 15 are respectively globe valves.

[0065] The three-way valve group is mainly arranged on the vacuum side and the hydrogen side (including the driving end and the non-driving end). Specifically, the three-way valve group includes the first three-way valve 21 to the fifth three-way valve 25. The first three-way valve 21 is arranged on the external pipeline of the vacuum side, that is, on the vacuum side oil inlet pipe 202; the second three-way valve 22 and the third three-way valve 23 are respectively arranged on the external pipelines of the hydrogen side at the driving end, that is, on the hydrogen side oil supply pipe and the hydrogen side return oil pipe 303 at the driving end. The fourth three-way valve 24 and the fifth three-way valve 25 are arranged on the external pipelines of the hydrogen side at the non-driving end, that is, on the non-driving end hydrogen side return oil pipe 304 and the non-driving end hydrogen side oil inlet pipe.

[0066] In the three-way valve group, two ports of each three-way valve are connected to the pipeline where it is located, and the other port is bypassed to the flushing and filtering unit 30. Any two of the three ports of each three-way valve can be made to communicate with each other.

[0067] The flushing and filtering unit 30 is connected between the air side return oil pipe 103 and the air side oil tank 100, and is used for filtering when the medium oil is flushed through to remove impurities in the medium oil, etc. The flushing and filtering unit 30 is provided with five parallel interfaces 1, 2, 3, 4, 5, and the first three-way valve 21 to the fifth three-way valve 25 are respectively bypassed to the five interfaces 1, 2, 3, 4, 5.

[0068] Furthermore, the flushing and filtering unit 30 may include a filtering component, a first flushing pipeline 31 connected between the inlet end of the filtering component and the air side return oil pipe, and a second flushing pipeline 32 connected between the outlet end of the filtering component and the air side oil tank 100. The five interfaces 1, 2, 3, 4, 5 are connected in parallel on the first flushing pipeline 31. A stop valve 33 is provided on the first flushing pipeline 31. The pipe section where the stop valve 33 is located is also connected in parallel with the five interfaces 1, 2, 3, 4, 5, and the five interfaces 1, 2, 3, 4, 5 and the first flushing pipeline 31 form six branch paths. When each branch path is connected, it can allow the medium oil to pass through and enter the filtering component.

[0069] The filtering component includes two filters 34 arranged in parallel. The two filters 34 are backup to each other, and a drain valve is installed at the bottom of each filter 34. The inlet ends of the two filters 34 are connected to the first flushing pipeline 31 through an inlet three-way valve 35 and an isolation valve 36. A sampling valve 37 is also connected to the inlet end of the filter 34, which is convenient for sampling during the flushing process. The outlet ends of the two filters 34 are connected to the second flushing pipeline 32 through an outlet three-way valve 38.

[0070] For the flushing and filtering unit 30, the first flushing pipeline 31, the second flushing pipeline 32 and the connection of other pipelines, etc. can be realized by using steel wire hoses.

[0071] Applying the flushing device for the three-flow ring seal oil system of the present invention to flush the three-flow ring seal oil system includes flushing the air side circuit, the vacuum side circuit and the hydrogen side circuit.

[0072] Among them, as Figure 3 shown, the air-side circuit flushing includes the following steps:

[0073] S1.1. For two five-valve groups, open the first valve 11 and the second valve 12 respectively, and keep the third valve 13, the fourth valve 14 and the fifth valve 15 closed.

[0074] S1.2. Start the air-side pump 101 to extract the medium oil in the air-side oil tank 100. The medium oil flows through the air-side inlet pipe 102, the second valve 12, the main pipe 10, the first valve 11 and the air-side return pipe 103 in sequence, and then enters the flushing and filtering unit 30 from the air-side return pipe 103.

[0075] S1.3. After the medium oil is filtered by the flushing and filtering unit 30, it flows back into the air-side oil tank 100, so as to realize the circulating flushing of the medium oil.

[0076] Among them, the medium oil enters the filter 34 along the first flushing pipeline 31 through the stop valve 33, the isolation valve 36 and the inlet three-way valve 35, and after being filtered, it flows back into the air-side oil tank 100 through the outlet three-way valve 38 and the second flushing pipeline 32, mainly entering the air-side oil tank 100 from the top thereof.

[0077] The flow direction of the medium oil for the air-side circuit flushing is as Figure 3 shown by each short arrow in

[0078] In the vacuum-side circuit flushing, it further includes the internal pipeline flushing of the vacuum-side integrated assembly and the external pipeline flushing of the vacuum side.

[0079] As Figure 4 shown, the internal pipeline flushing of the vacuum-side integrated assembly includes the following steps:

[0080] S2.1. For two five-valve groups, open the first valve 11 and the second valve 12 respectively, and keep the third valve 13, the fourth valve 14 and the fifth valve 15 closed. The first three-way valve 21 connects the internal pipeline 203 of the vacuum-side integrated assembly and the corresponding interface 1 on the flushing and filtering unit 30, and other three-way valves are kept closed.

[0081] S2.2. Start the air-side pump 101 to extract the medium oil in the air-side oil tank 100; a part of the medium oil enters the vacuum-side oil tank 200 through the air-side inlet pipe 102, the vacuum-side oil pump 201 is started to extract the medium oil in the vacuum-side oil tank 200, and then it flows through the internal pipeline 203 of the vacuum-side integrated assembly, the first three-way valve 21 and the interface 1 into the flushing and filtering unit 30; another part of the medium oil enters the second valve 12, the main pipe 10, the first valve 11 and the air-side return pipe 103 through the air-side inlet pipe 102 in sequence, and then enters the flushing and filtering unit 30 from the air-side return pipe 103.

[0082] S2.3. After the dielectric oil is filtered by the flushing and filtering unit for 30, it flows back into the air-side oil tank 100.

[0083] Among them, a part of the dielectric oil enters the first flushing pipeline 31 through the interface 1, successively passes through the stop valve 33, the isolation valve 36 and the inlet three-way valve 35, enters the filter 34, and after being filtered, flows back into the air-side oil tank 100 through the outlet three-way valve 38 and the second flushing pipeline 32, mainly entering from the top of the air-side oil tank 100.

[0084] Another part of the dielectric oil enters the filter 34 along the first flushing pipeline 31 through the stop valve 33, the isolation valve 36 and the inlet three-way valve 35, and after being filtered, flows back into the air-side oil tank 100 through the outlet three-way valve 38 and the second flushing pipeline 32, mainly entering from the top of the air-side oil tank 100.

[0085] The flow direction of the dielectric oil for flushing the internal pipeline of the vacuum-side container assembly is as shown by each short arrow in Figure 4 the figure.

[0086] As Figure 5 shown, the flushing of the external pipeline of the vacuum side includes the following steps:

[0087] S3.1. For two groups of five-valve assemblies, open the second valve 12 and the third valve 13 respectively, and keep the first valve 11, the fourth valve 14 and the fifth valve 15 closed; the first three-way valve 21 connects the vacuum-side inlet oil pipe 202 and the corresponding interface 1 on the flushing and filtering unit 30, and the other three-way valves remain closed.

[0088] S3.2. Start the air-side pump 101 to pump out the dielectric oil in the air-side oil tank 100. The dielectric oil enters the second valve 12, the main pipeline 10, the third valve 13 and the vacuum-side inlet oil pipe 202 in sequence through the air-side inlet oil pipe 102, and then enters the flushing and filtering unit 30 through the first three-way valve 21 and the interface 1.

[0089] S3.3. After the dielectric oil is filtered by the flushing and filtering unit 30, it flows back into the air-side oil tank 100.

[0090] Among them, the dielectric oil enters the first flushing pipeline 31 from the interface 1, enters the filter 34 through the isolation valve 36 and the inlet three-way valve 35, and after being filtered, flows back into the air-side oil tank 100 through the outlet three-way valve 38 and the second flushing pipeline 32, mainly entering from the top of the air-side oil tank 100.

[0091] The flow direction of the dielectric oil for flushing the external pipeline of the vacuum side is as shown by each short arrow in Figure 5 the figure.

[0092] During the flushing of the hydrogen side circuit, it further includes the flushing of the external hydrogen side pipeline and the internal pipeline of the hydrogen side container assembly. Further still, the flushing of the external hydrogen side pipeline includes the flushing of the hydrogen side oil supply pipeline and the hydrogen side oil return pipeline.

[0093] Among them, as Figure 6 shown, the flushing of the hydrogen side oil supply pipeline includes the following steps:

[0094] S4.1. For two groups of five-valve assemblies, open the second valve 12 and the fourth valve 14 respectively, and keep the first valve 11, the third valve 13 and the fifth valve 15 closed; the second three-way valve 22 connects the driving-end hydrogen side oil supply pipeline 301 and the corresponding interface 2 on the flushing and filtering unit 30, and the fifth three-way valve 25 connects the non-driving-end hydrogen side oil supply pipeline 302 and the corresponding interface 5 on the flushing and filtering unit 30, and the remaining three-way valves are kept closed.

[0095] S4.2. Start the air side pump 101 to pump out the medium oil in the air side oil tank 100. The medium oil enters the second valve 12, the main pipeline 10 and the fourth valve 14 through the air side inlet pipeline 102. A part of the medium oil enters the flushing and filtering unit 30 through the driving-end hydrogen side oil supply pipeline 301, the second three-way valve 22 and the interface 2, and another part of the medium oil enters the flushing and filtering unit 30 through the non-driving-end hydrogen side oil supply pipeline 302, the fifth three-way valve 25 and the interface 5.

[0096] S4.3. After the medium oil is filtered by the flushing and filtering unit 30, it flows back into the air side oil tank 100.

[0097] Among them, the medium oil enters the first flushing pipeline 31 from the interface 2 and the interface 5 respectively, enters the filter 34 through the isolation valve 36 and the inlet three-way valve 35, and after being filtered, flows back into the air side oil tank 100 through the outlet three-way valve 38 and the second flushing pipeline 32, mainly entering from the top of the air side oil tank 100.

[0098] The flow direction of the medium oil for the flushing of the hydrogen side oil supply pipeline is as shown by Figure 6 each short arrow in.

[0099] As Figure 7 shown, the flushing of the hydrogen side oil return pipeline includes the following steps:

[0100] S5.1. For two groups of five-valve assemblies, open the second valve 12 and the fifth valve 15 respectively, and keep the first valve 11, the third valve 13 and the fourth valve 14 closed; the third three-way valve 23 connects the driving-end hydrogen side oil return pipeline 303 and the corresponding interface 3 on the flushing and filtering unit 30, and the fourth three-way valve 24 connects the non-driving-end hydrogen side oil return pipeline 304 and the corresponding interface 4 on the flushing and filtering unit 30, and the remaining three-way valves are kept closed.

[0101] S5.2. Start the air-side pump 101 to extract the dielectric oil in the air-side oil tank 100. The dielectric oil enters the second valve 12 and the fifth valve 15 through the air-side inlet pipe 102. A part of the dielectric oil enters the flushing and filtering unit 30 through the drive-end hydrogen-side return pipe 303, the third three-way valve 23 and the interface 3, and another part of the dielectric oil enters the flushing and filtering unit 30 through the non-drive-end hydrogen-side return pipe 304, the fourth three-way valve 24 and the interface 4.

[0102] S5.3. After being filtered by the flushing and filtering unit 30, the dielectric oil flows back into the air-side oil tank 100.

[0103] Among them, the dielectric oil enters the first flushing pipeline 31 from the interface 3 and the interface 4 respectively, enters the filter 34 through the isolation valve 36 and the inlet three-way valve 35, and flows back into the air-side oil tank 100 through the outlet three-way valve 38 and the second flushing pipeline 32 after being filtered, mainly entering it from the top of the air-side oil tank 100.

[0104] The flow direction of the dielectric oil for flushing the hydrogen-side return pipe is as Figure 7 shown by each short arrow.

[0105] The flushing of the internal pipes of the hydrogen-side container assembly includes the flushing of the internal pipes of the non-drive-end hydrogen-side container assembly and the flushing of the internal pipes of the drive-end hydrogen-side container assembly.

[0106] Among them, as Figure 8 shown, the flushing of the internal pipes of the non-drive-end hydrogen-side container assembly includes the following steps:

[0107] S6.1. Open the valves in the five-valve group on the non-drive-end side of the corresponding generator, including the second valve 12 and the fifth valve 15. The fifth valve 15 is connected to the non-drive-end hydrogen-side return pipe 304, and the remaining valves and the other group of five-valve groups are kept closed. Connect the fourth three-way valve 24 to the non-drive-end hydrogen-side return pipe 304, and connect the fifth three-way valve 25 to the oil supply pipe 305 inside the non-drive-end hydrogen-side container assembly and the corresponding interface 5 on the flushing and filtering unit 30, and keep the other three-way valves closed.

[0108] S6.2. Start the air-side pump 101 to extract the dielectric oil in the air-side oil tank 100. The dielectric oil enters the second valve 12, the main pipeline 10 and the fifth valve 15 through the air-side inlet pipe 102, and then enters the flushing and filtering unit 30 through the non-drive-end hydrogen-side return pipe 304, the fourth three-way valve 24, the non-drive-end hydrogen-side oil pump 300 and the fifth three-way valve 25 in sequence.

[0109] S6.3. After being filtered by the flushing and filtering unit 30, the dielectric oil flows back into the air-side oil tank 100.

[0110] Among them, the dielectric oil enters the first flushing pipeline 31 from the interface 5, enters the filter 34 through the isolation valve 36 and the inlet three-way valve 35, and after being filtered, flows back to the air-side oil tank 100 through the outlet three-way valve 38 and the second flushing pipeline 32, mainly entering the air-side oil tank 100 from the top thereof.

[0111] The flow direction of the dielectric oil for flushing the internal pipeline of the non-driving-end hydrogen-side integrated assembly is as Figure 8 shown by each short arrow in

[0112] As Figure 9 shown, the flushing of the internal pipeline of the driving-end hydrogen-side integrated assembly includes the following steps:

[0113] S7.1. Open the valves in the five-valve group on the driving-end side of the corresponding generator, including the second valve 12 and the fifth valve 15 among them, where the fifth valve 15 is connected to the driving-end hydrogen-side return oil pipe 303, and the remaining valves and the other group of five-valve groups are kept closed. Connect the third three-way valve 23 to the driving-end hydrogen-side return oil pipe 303, and connect the second three-way valve 22 to the corresponding interface 2 on the oil supply pipe 306 inside the driving-end hydrogen-side integrated assembly and the flushing and filtering unit 30, and keep the remaining three-way valves closed.

[0114] S7.2. Start the air-side pump 101 to extract the dielectric oil in the air-side oil tank 100. The dielectric oil enters the second valve 12, the main pipeline 10, and the fifth valve 15 through the air-side inlet oil pipe 102, and then sequentially passes through the third three-way valve 23, the driving-end hydrogen-side oil pump 310, the oil supply pipe 306 inside the driving-end hydrogen-side integrated assembly, and the second three-way valve 22 along the driving-end hydrogen-side return oil pipe 303 and enters the flushing and filtering unit 30.

[0115] S7.3. After the dielectric oil is filtered by the flushing and filtering unit 30, it flows back into the air-side oil tank 100.

[0116] Among them, the dielectric oil enters the first flushing pipeline 31 from the interface 2, enters the filter 34 through the isolation valve 36 and the inlet three-way valve 35, and after being filtered, flows back to the air-side oil tank 100 through the outlet three-way valve 38 and the second flushing pipeline 32, mainly entering the air-side oil tank 100 from the top thereof.

[0117] The flow direction of the dielectric oil for flushing the internal pipeline of the driving-end hydrogen-side integrated assembly is as Figure 9 shown by each short arrow in

[0118] In addition, flushing the three-flow ring seal oil system also includes flushing the accumulator circuit, which can be realized by using the existing technology and will not be elaborated here.

[0119] After flushing each of the above circuits, remove the five-valve group and the flushing and filtering unit, and restore the formal pipeline.

[0120] In summary, the flushing device for the three - flow ring seal oil system of the present invention flushes the three - flow ring seal oil system. Only one installation is required at the beginning to achieve the flushing of the air - side circuit, vacuum - side circuit, and hydrogen - side circuit in the three - flow ring seal oil system. During this process, only the on - off of the pipeline needs to be controlled by valve switching, and there is no need to disassemble and assemble the valves and pipelines anymore; during the flushing process, there is no need to drain the oil and then disassemble the pipeline to re - establish the flushing circuit, which saves oil, reduces the risk of oil leakage, and reduces oil pollution.

[0121] The present invention is applied in the flushing work of the three - flow ring seal oil system. Compared with the prior art, it can save 6 days of flushing construction period and 4 person - days of labor. Saving 6 days of construction period is obvious when commissioning the system, especially when the whole system needs to be flushed during the major overhaul of the unit.

[0122] The above - mentioned are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A flushing method for a three-flow-ring sealed oil system, characterized in that, Adopt a three - flow ring seal oil system flushing device. The three - flow ring seal oil system flushing method includes air - side loop flushing, vacuum - side loop flushing, and hydrogen - side loop flushing; The three - flow ring seal oil system flushing device includes two groups of five - valve assemblies, three - way valve assemblies, and flushing and filtering units corresponding to both sides of the generator; The five - valve assembly includes a main pipeline, and the first valve to the fifth valve are connected in parallel on the main pipeline. The first valve and the second valve are respectively connected to the air - side return oil pipe and the air - side inlet oil pipe. The third valve is connected to the vacuum - side inlet oil pipe. The fourth valve and the fifth valve are respectively connected to the hydrogen - side supply oil pipe and the hydrogen - side return oil pipe; The three - way valve assembly includes the first three - way valve to the fifth three - way valve. The first three - way valve is arranged on the external pipeline of the vacuum side. The second three - way valve and the third three - way valve are respectively arranged on the external pipelines of the hydrogen - side at the driving end. The fourth three - way valve and the fifth three - way valve are arranged on the external pipelines of the hydrogen - side at the non - driving end; The flushing and filtering unit is connected between the air - side return oil pipe and the air - side oil tank. The flushing and filtering unit is provided with five parallel interfaces, and the first three - way valve to the fifth three - way valve are respectively bypassed to the five interfaces; The flushing and filtering unit includes a filtering component, a first flushing pipeline connected between the inlet end of the filtering component and the air - side return oil pipe, and a second flushing pipeline connected between the outlet end of the filtering component and the air - side oil tank. The five interfaces are connected in parallel on the first flushing pipeline, and a stop valve is arranged on the first flushing pipeline; The filtering component includes two filters arranged in parallel; the inlet ends of the two filters are connected to the first flushing pipeline through an inlet three - way valve and an isolation valve; the outlet ends of the two filters are connected to the second flushing pipeline through an outlet three - way valve; Among the two groups of five - valve assemblies, the fourth valve and the fifth valve of one group of five - valve assemblies are respectively connected to the hydrogen - side supply oil pipe and the hydrogen - side return oil pipe at the driving end, and the fourth valve and the fifth valve of the other group of five - valve assemblies are respectively connected to the hydrogen - side supply oil pipe and the hydrogen - side return oil pipe at the non - driving end; An exhaust valve is installed on the main pipeline; The first valve to the fifth valve are respectively stop valves.

2. The flushing method of the three-flow-ring seal oil system according to claim 1, wherein The air - side loop flushing includes the following steps: S1.

1. Open the first valve and the second valve, and keep the third valve to the fifth valve closed; S1.

2. Start the air - side pump, draw out the medium oil in the air - side oil tank. The medium oil flows through the air - side inlet oil pipe, the second valve, the first valve, and the air - side return oil pipe in sequence, and then enters the flushing and filtering unit from the air - side return oil pipe; S1.

3. After the medium oil is filtered by the flushing and filtering unit, it flows back into the air - side oil tank.

3. The flushing method of the three-flow-ring seal oil system according to claim 1, wherein, The vacuum - side loop flushing includes the internal pipeline flushing of the vacuum - side integrated assembly and the external pipeline flushing of the vacuum - side; Among them, the internal pipeline flushing of the vacuum - side integrated assembly includes the following steps: S2.

1. Open the first valve and the second valve, keep the third valve to the fifth valve closed, and connect the internal pipeline of the vacuum - side integrated assembly and the corresponding interface on the flushing and filtering unit through the first three - way valve; S2.

2. Start the air-side pump to extract the dielectric oil in the air-side oil tank. A part of the dielectric oil enters the vacuum-side oil tank through the air-side inlet pipe, then flows through the vacuum-side oil pump and the first three-way valve into the flushing and filtering unit; another part of the dielectric oil enters the second valve, the first valve and the air-side return pipe in sequence through the air-side inlet pipe, and then enters the flushing and filtering unit from the air-side return pipe. S2.

3. After being filtered by the flushing and filtering unit, the dielectric oil flows back into the air-side oil tank. The flushing of the external pipeline on the vacuum side includes the following steps: S3.

1. Open the second valve and the third valve, keep the first valve, the fourth valve and the fifth valve closed, and the first three-way valve connects the corresponding interfaces on the vacuum-side inlet pipe and the flushing and filtering unit. S3.

2. Start the air-side pump to extract the dielectric oil in the air-side oil tank. The dielectric oil enters the second valve and the third valve in sequence through the air-side inlet pipe, then enters the vacuum-side inlet pipe, and then enters the flushing and filtering unit through the first three-way valve. S3.

3. After being filtered by the flushing and filtering unit, the dielectric oil flows back into the air-side oil tank.

4. The flushing method of the three-flow-ring seal oil system according to claim 1, characterized in that The flushing of the hydrogen-side circuit includes the flushing of the external pipeline on the hydrogen side; the flushing of the external pipeline on the hydrogen side includes the flushing of the hydrogen-side supply pipe and the flushing of the hydrogen-side return pipe. Among them, the flushing of the hydrogen-side supply pipe includes the following steps: S4.

1. Open the second valve and the fourth valve, keep the first valve, the third valve and the fifth valve closed, connect the driving-end hydrogen-side supply pipe and the corresponding interface on the flushing and filtering unit with the second three-way valve, and connect the non-driving-end hydrogen-side supply pipe and the corresponding interface on the flushing and filtering unit with the fifth three-way valve. S4.

2. Start the air-side pump to extract the dielectric oil in the air-side oil tank. The dielectric oil enters the second valve and the fourth valve through the air-side inlet pipe, and then enters the flushing and filtering unit through the driving-end hydrogen-side supply pipe and the second three-way valve, and the non-driving-end hydrogen-side supply pipe and the fifth three-way valve respectively. S4.

3. After being filtered by the flushing and filtering unit, the dielectric oil flows back into the air-side oil tank. The flushing of the hydrogen-side return pipe includes the following steps: S5.

1. Open the second valve and the fifth valve, keep the first valve, the third valve and the fourth valve closed, connect the driving-end hydrogen-side return pipe and the corresponding interface on the flushing and filtering unit with the third three-way valve, and connect the non-driving-end hydrogen-side return pipe and the corresponding interface on the flushing and filtering unit with the fourth three-way valve. S5.

2. Start the air-side pump to extract the dielectric oil in the air-side oil tank. The dielectric oil enters the second valve and the fifth valve through the air-side inlet pipe, and then enters the flushing and filtering unit through the driving-end hydrogen-side return pipe and the third three-way valve, and the non-driving-end hydrogen-side return pipe and the fourth three-way valve respectively. S5.

3. After being filtered by the flushing and filtering unit, the dielectric oil flows back into the air-side oil tank.

5. The flushing method of the three-flow-ring seal oil system according to claim 1, characterized in that The flushing of the hydrogen-side circuit also includes the flushing of the internal pipeline of the hydrogen-side container assembly; the flushing of the internal pipeline of the hydrogen-side container assembly includes the flushing of the internal pipeline of the non-driving-end hydrogen-side container assembly and the flushing of the internal pipeline of the driving-end hydrogen-side container assembly. Among them, the flushing of the internal pipeline of the non-driving-end hydrogen-side container assembly includes the following steps: S6.

1. Open the fifth valve and the second valve in a set of five-valve groups that connect to the non-drive-end hydrogen-side return oil pipe. Keep the remaining valves and the other set of five-valve groups closed. The fourth three-way valve connects to the non-drive-end hydrogen-side return oil pipe, and the fifth three-way valve connects to the oil supply pipe inside the non-drive-end hydrogen-side assembly unit and the corresponding interface on the flushing and filtering unit; S6.

2. Start the air-side pump to pump out the dielectric oil in the air-side oil tank. The dielectric oil enters the second valve and the fifth valve through the air-side inlet oil pipe, and then enters the flushing and filtering unit through the fourth three-way valve, the non-drive-end hydrogen-side oil pump, and the fifth three-way valve in sequence; S6.

3. After the dielectric oil is filtered by the flushing and filtering unit, it flows back into the air-side oil tank; The internal pipeline flushing of the drive-end hydrogen-side assembly unit includes the following steps: S7.

1. Open the fifth valve and the second valve in a set of five-valve groups that connect to the drive-end hydrogen-side return oil pipe. Keep the remaining valves and the other set of five-valve groups closed. The third three-way valve connects to the drive-end hydrogen-side return oil pipe, and the second three-way valve connects to the oil supply pipe inside the drive-end hydrogen-side assembly unit and the corresponding interface on the flushing and filtering unit; S7.

2. Start the air-side pump to pump out the dielectric oil in the air-side oil tank. The dielectric oil enters the second valve and the fifth valve through the air-side inlet oil pipe, and then enters the flushing and filtering unit through the third three-way valve, the drive-end hydrogen-side oil pump, and the second three-way valve in sequence; S7.

3. After the dielectric oil is filtered by the flushing and filtering unit, it flows back into the air-side oil tank.

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