Steam turbine generator set flushing device and flushing method

Abstract

This invention belongs to the technical field of steam turbine lubrication oil systems, and discloses a steam turbine generator set flushing device and flushing method. The steam turbine generator set flushing device includes a flushing pump, a filter, a multi-way diversion valve, a filter screen, and flushing components. The input end of the flushing pump is connected to the outlet of the main oil tank, and the input end of the filter is connected to the output end of the flushing pump. Interface A1 is connected to the output end of the filter, interface A2 is connected to the inlet of the oil supply pipe, interface A3 is connected to the inlet of the oil cooler, the filter screen is located at the outlet of the casing oil pipe, the input end of the high-pressure oil gun is connected to interface A4, and the output end of the high-pressure oil gun is connected to the nozzle, which faces the top wall inside the casing oil pipe. It can perform coordinated flushing of the steam turbine body, oil supply and return pipes, oil cooler, and casing oil pipe of the steam turbine generator set, solving the problems of inconvenient flushing and secondary contamination of shell-and-tube oil coolers in conventional flushing. Furthermore, using a high-pressure oil gun to perform targeted flushing of the inner wall of the casing oil pipe can improve the flushing coverage and flushing efficiency.

Description

Technical Field

[0001] This invention relates to the field of steam turbine lubrication oil system technology, and more particularly to a steam turbine generator set flushing device and flushing method. Background Technology

[0002] The lubrication system of a steam turbine generator set is a crucial auxiliary system. The cleanliness of the lubrication system pipelines largely determines whether the system can operate safely, effectively, and stably. Particles in the lubrication oil can cause wear on bearings and journals, jamming of emergency trip valves, and blockage of control ports, posing safety hazards and seriously impacting the operation of the entire unit.

[0003] Oil coolers are turbine oil cooling devices used in power systems, specifically for steam turbines. These coolers are surface-mounted with smooth tubes and use closed-loop circulating cooling water as the heat exchange medium. However, during normal operation, friction between rotating metal parts generates iron filings that enter the cooler with the oil flow. Furthermore, during the flushing process of the turbine generator set, some larger-diameter oil pipes may not be completely filled with lubricating oil, resulting in the top wall of the pipe not contacting the lubricating oil and thus preventing effective flushing.

[0004] Therefore, there is an urgent need for a steam turbine generator set flushing device and flushing method to solve the above problems. Summary of the Invention

[0005] According to one aspect of the present invention, the turbine generator set flushing device provided by the present invention can perform coordinated flushing of the turbine generator set lubrication system, solve the problems of inconvenient flushing of the oil cooler and secondary pollution, and perform targeted flushing of the inner wall of the sleeve oil pipe, which can improve the flushing coverage and flushing efficiency.

[0006] To address the aforementioned problems in the existing technology, the present invention adopts the following technical solution:

[0007] A steam turbine generator set flushing device is used to flush a steam turbine generator set, which includes a turbine body and a lubrication oil system. The lubrication oil system includes a main oil tank, an oil cooler, an oil supply pipe, and a return oil pipe. The main oil tank is connected to the oil cooler, the oil supply pipe, and the return oil pipe through the oil supply pipe. The turbine body is connected to the oil supply pipe and the return oil pipe through the oil supply pipe. The steam turbine generator set flushing device includes:

[0008] A flushing pump, the input of which is connected to the outlet of the main oil tank;

[0009] A filter, the input of which is connected to the output of the flushing pump;

[0010] A multi-way diverter valve has an A1 port, an A2 port, an A3 port, and an A4 port. The A1 port can be connected to or disconnected from the A2, A3, and A4 ports. The A1 port is connected to the output end of the filter, the A2 port is connected to the inlet of the oil supply pipe, and the A3 port is connected to the inlet of the oil cooler.

[0011] A filter screen is disposed at the outlet of the sleeve oil pipe;

[0012] The flushing assembly includes a high-pressure oil gun and a nozzle. The input end of the high-pressure oil gun is connected to the A4 interface, and the output end of the high-pressure oil gun is connected to the nozzle. The high-pressure oil gun is fixedly installed through the inspection port of the sleeve oil pipe. The spray direction of the nozzle is towards the top wall inside the sleeve oil pipe, and it is used to flush impurities from the inner wall of the sleeve oil pipe.

[0013] As an optional technical solution, the nozzle is provided with multiple spray holes, and the lubricating oil sprayed from the multiple spray holes is radial.

[0014] As an optional technical solution, there are multiple nozzles, which are spaced apart along the axial direction of the tubing.

[0015] As an optional technical solution, the turbine generator set flushing device further includes a cooler, which is installed in the connecting pipeline between the flushing pump and the A1 interface and is used to cool the lubricating oil used for flushing.

[0016] As an optional technical solution, the turbine generator set flushing device further includes a heater, the input end of which is connected to the cooler, and the output end of which is connected to the A1 interface and used to heat the lubricating oil used for flushing.

[0017] As an optional technical solution, the turbine generator set flushing device further includes a regulating valve, which is connected in parallel with the flushing pump. The input end of the regulating valve is connected to the outlet of the main oil tank, and the output end of the regulating valve is connected to the input end of the filter, for adjusting the flushing flow rate of the flushing pump.

[0018] As an optional technical solution, the turbine generator set flushing device further includes a first three-way valve and a second three-way valve. There are two oil coolers. The first three-way valve has a B1 port, a B2 port, and a B3 port. The B1 port can be selectively connected to either the B2 port or the B3 port. The B1 port is connected to the A3 port. The B2 port and the B3 port are respectively connected to the inlets of the two oil coolers. The second three-way valve has a C1 port, a C2 port, and a C3 port. The C1 port can be selectively connected to either the C2 port or the C3 port. The C1 port is connected to the sleeve oil pipe. The C2 port and the C3 port are respectively connected to the outlets of the two oil coolers.

[0019] As an optional technical solution, the turbine generator set flushing device also includes a permanent magnet grid, which is installed at the bottom of the bearing housing of the turbine body and inside the main oil tank, and is used to adsorb and collect magnetic foreign objects in the lubricating oil.

[0020] As an optional technical solution, the filter screen is detachably connected to the outlet of the oil pipe.

[0021] According to another aspect of the present invention, a turbine generator set flushing method is provided, wherein, through the implementation of the above-described turbine generator set flushing device, the turbine generator set flushing method includes:

[0022] S100: Lubricating oil is flushed in large flow through the A1 and A2 interfaces to the oil supply pipe, the oil return pipe and the turbine body;

[0023] S200: Lubricating oil flushes the oil cooler at a high flow rate through the A1 and A3 interfaces;

[0024] S300: Lubricating oil is sprayed through the A1 and A4 interfaces and flushed against the top wall of the oil pipe using the nozzle of the high-pressure oil gun.

[0025] The beneficial effects of this invention are as follows:

[0026] The turbine generator set flushing device provided by this invention has a flushing pump whose input end is connected to the outlet of the main oil tank, and a filter whose input end is connected to the output end of the flushing pump. A multi-way diverter valve has interfaces A1, A2, A3, and A4, with interface A1 capable of connecting or disconnecting from interfaces A2, A3, and A4. A filter screen is located at the outlet of the sleeved oil pipe. The flushing assembly includes a high-pressure oil gun and a nozzle; the input end of the high-pressure oil gun is connected to interface A4, and the output end of the high-pressure oil gun is connected to the nozzle. When flushing of the turbine body and lubrication pipes of the turbine generator set is required, interface A1 is connected to interface A2. Lubricating oil flows through interfaces A1 and A2 to flush the oil supply pipe, oil return pipe, and turbine body at a high flow rate. After flushing, interface A1 is disconnected from interface A2. Simultaneously, the flushed lubricating oil flows back to the main oil tank through the sleeved oil pipe and is filtered by the filter screen to ensure that the lubricating oil in the main oil tank is free of impurities. When flushing the oil cooler of the steam turbine generator set is required, interfaces A1 and A3 are connected. Lubricating oil flows through interfaces A1 and A3 to flush the oil cooler at a high flow rate. After flushing, interfaces A1 and A3 are disconnected. Simultaneously, the flushed lubricating oil flows back to the main oil tank through the sleeve oil pipe and is filtered through a filter screen to avoid the risk of secondary contamination. When flushing the sleeve oil pipe of the steam turbine generator set is required, interfaces A1 and A4 are connected. Lubricating oil flows through interfaces A1 and A4, and a high-pressure oil gun nozzle sprays lubricating oil onto the top wall inside the sleeve oil pipe. Impurities flushed out are collected along with the lubricating oil and flow back to the main oil tank through the sleeve oil pipe for reuse. This steam turbine generator set flushing device can simultaneously flush the turbine body, supply and return oil pipes, oil cooler, and sleeve oil pipe of the steam turbine generator set, solving the problems of inconvenient flushing and secondary contamination of shell-and-tube oil coolers in conventional flushing, improving flushing efficiency, and thus shortening the flushing period of the steam turbine generator set lubrication system. Furthermore, using a high-pressure oil gun to perform targeted flushing of the inner wall of the tubing can improve flushing coverage and flushing efficiency.

[0027] The turbine generator set flushing method provided by this invention, through the implementation of a turbine generator set flushing device, uses lubricating oil to flush the oil supply pipe, oil return pipe, and turbine body at a high flow rate through interfaces A1 and A2; lubricating oil also flushes the oil cooler at a high flow rate through interfaces A1 and A3; and lubricating oil is sprayed onto the top wall of the inner casing oil pipe through interfaces A1 and A4 using a high-pressure oil gun nozzle for flushing. This method enables coordinated flushing of the turbine body, oil supply and return pipes, oil cooler, and inner casing oil pipe of the turbine generator set, solving the problems of inconvenient flushing and secondary contamination of shell-and-tube oil coolers in conventional flushing, improving flushing efficiency, and thus shortening the flushing period of the turbine generator set lubrication system. Furthermore, using a high-pressure oil gun to perform targeted flushing of the inner wall of the inner casing oil pipe improves flushing coverage and efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the steam turbine generator set flushing device provided in Embodiment 1 of the present invention;

[0029] Figure 2 This is a flowchart of a steam turbine generator set flushing method provided in Embodiment 2 of the present invention.

[0030] Figure label:

[0031] 100. Main oil tank; 200. Oil cooler; 300. Oil pipe assembly; 301. Inspection port; 400. Oil supply pipe; 500. Oil return pipe; 600. Steam turbine body;

[0032] 1. Flushing pump; 2. Filter; 3. Multi-way diverter valve; 4. Filter screen; 5. High-pressure oil gun; 6. Nozzle; 7. Heater; 8. Cooler; 9. Regulating valve; 10. First three-way valve; 11. Second three-way valve; 12. Permanent magnet grid; 13. Vibrator. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0037] Example 1

[0038] like Figure 1 As shown, in this embodiment, the turbine generator set flushing device includes a flushing pump 1, a filter 2, a multi-way diverter valve 3, a filter screen 4, and flushing components. The input end of the flushing pump 1 is connected to the outlet of the main oil tank 100, and the input end of the filter 2 is connected to the output end of the flushing pump 1. The multi-way diverter valve 3 has interfaces A1, A2, A3, and A4. Interface A1 can be connected to or disconnected from interfaces A2, A3, and A4. Interface A1 is connected to the output end of the filter 2, interface A2 is connected to the inlet of the oil supply pipe 400, and interface A3 is connected to the inlet of the oil cooler 200. The filter screen 4 is located at the outlet of the oil pipe 300. The flushing assembly includes a high-pressure oil gun 5 and a nozzle 6. The input end of the high-pressure oil gun 5 is connected to an A4 interface, and the output end of the high-pressure oil gun 5 is connected to the nozzle 6. The high-pressure oil gun 5 is fixedly installed through the inspection port 301 of the oil pipe 300. The spray direction of the nozzle 6 is towards the top wall inside the oil pipe 300 and is used to flush impurities from the inner wall of the oil pipe 300.

[0039] For example, the turbine body 600 includes a high-pressure cylinder, a low-pressure cylinder, and a bearing housing. An oil supply pipe 300 is connected to the main oil tank 100. The oil outlet of the oil cooler 200 is connected to the oil supply pipe 300. The oil supply pipe 300 has an oil port. The lubricating oil circuit of the turbine body 600 is connected to the oil port of the oil supply pipe 300 via an oil supply pipe 400 and a return pipe 500. Lubricating oil from the main oil tank 100 is supplied to the turbine body 600 via the oil supply pipe 300 and the oil supply pipe 400. The lubricating oil in the turbine body 600 then flows back to the main oil tank 100 via the return pipe 500 and the oil supply pipe 300.

[0040] The flushing pump 1 serves as the power source for flushing, pumping lubricating oil from the main oil tank 100. It can provide a flow rate no less than twice the normal operating speed of the lubricating oil system. Furthermore, the flushing pump 1 is equipped with a variable frequency pump body; under different flushing conditions, the operating frequency of the flushing pump 1 can be adjusted to control the lubricating oil flushing flow rate within a set range. The filter 2 is installed on the connecting pipeline between the flushing pump 1 and the multi-way diverter valve 3, used to filter the lubricating oil pumped out by the flushing pump 1, ensuring the cleanliness of the lubricating oil used for flushing.

[0041] The filter screen 4 is installed at the outlet of the oil pipe 300 and located inside the main oil tank 100. It is used to filter the lubricating oil flowing out of the oil pipe 300, ensuring that clean lubricating oil enters the main oil tank 100 for flushing or lubrication.

[0042] The multi-way diverter valve 3 is configured with a one-inlet, three-outlet valve body structure, meaning that port A1 is the inlet, and ports A2, A3, and A4 are the outlets. Port A1 can selectively connect or disconnect any one or more of ports A2, A3, and A4. Optionally, the main path of the lubricating oil pumped by flushing pump 1 and filter 2 is provided with three branches, each equipped with an isolation valve. The on / off state can be controlled by independently controlling the isolation valve on any branch.

[0043] The A4 interface is connected to the input end of the flexible conduit via a flange, and the high-pressure oil gun 5 is connected to the output end of the flexible conduit. The high-pressure oil gun 5 extends into the interior of the sleeve oil pipe 300 through the inspection port 301. The high-pressure oil gun 5 is fixed inside the sleeve oil pipe 300 by a mechanical clamp. Because the lubricating oil in the sleeve oil pipe 300 cannot fill the pipe completely (i.e., the lubricating oil is mainly concentrated in the lower half of the sleeve oil pipe 300), the top wall of the sleeve oil pipe 300 does not contact the lubricating oil, resulting in ineffective flushing. The nozzle 6 of the high-pressure oil gun 5 sprays lubricating oil onto the top wall of the sleeve oil pipe 300, and the flushed impurities flow back to the main oil tank 100 with the lubricating oil for collection, facilitating secondary use.

[0044] When the turbine body 600 and lubrication pipes of the steam turbine generator set need to be flushed, the A1 and A2 interfaces are connected. Lubricating oil flows through the A1 and A2 interfaces to flush the oil supply pipe 400, return pipe 500, and turbine body 600 at a high flow rate. After flushing, the A1 and A2 interfaces are disconnected. Simultaneously, the flushed lubricating oil flows back to the main oil tank 100 through the sleeve oil pipe 300 and is filtered by the filter screen 4 to ensure that the lubricating oil in the main oil tank 100 is free of impurities. When the oil cooler 200 of the steam turbine generator set needs to be flushed, the A1 and A3 interfaces are connected. Lubricating oil flows through the A1 and A3 interfaces to flush the oil cooler 200 at a high flow rate. After flushing, the A1 and A3 interfaces are disconnected. Simultaneously, the flushed lubricating oil flows back to the main oil tank 100 through the sleeve oil pipe 300 and is filtered by the filter screen 4 to avoid the risk of secondary contamination. When the turbine generator set's oil pipe 300 needs to be flushed, the A1 and A4 interfaces are connected, and lubricating oil is sprayed through the A1 and A4 interfaces. The nozzle 6 of the high-pressure oil gun 5 is used to spray the lubricating oil onto the top wall inside the oil pipe 300, and the impurities flushed out are collected back into the main oil tank 100 along with the lubricating oil through the oil pipe 300 for secondary use.

[0045] This turbine generator set flushing device can perform coordinated flushing of the turbine body 600, oil supply and return pipes 500, oil cooler 200, and sleeve oil pipes 300 of the turbine generator set. This solves the problems of inconvenient flushing and secondary contamination of the shell-and-tube oil cooler 200 in conventional flushing, improving flushing efficiency and shortening the flushing period of the turbine generator set lubrication system. Furthermore, using a high-pressure oil gun 5 to perform targeted flushing of the inner wall of the sleeve oil pipes 300 can improve flushing coverage and efficiency.

[0046] Furthermore, referring to Figure 1 The nozzle 6 is equipped with multiple spray holes, and the lubricating oil sprayed from the multiple spray holes is radial. There are multiple nozzles 6, which are arranged at intervals along the axial direction of the oil pipe 300.

[0047] The nozzle 6 has multiple spray holes with a fan-shaped longitudinal section, and the spray coverage angle of the nozzle 6 is 120-150 degrees. When it is necessary to flush the oil pipe 300 of the turbine generator set, the A1 interface is connected to the A4 interface, and the nozzle 6 of the high-pressure oil gun 5 sprays lubricating oil onto the top wall of the oil pipe 300 for targeted flushing, improving flushing coverage and flushing efficiency. Especially when the oil temperature is high, using the high-pressure oil gun 5 can increase the fluidity of the lubricating oil inside the high-pressure oil gun 5. Preferably, the nozzle 6 is rotatably connected to the high-pressure oil gun 5 through an electrically driven rotating structure. The nozzle 6 rotates freely relative to the high-pressure spray gun, thereby thoroughly flushing the top wall of the oil pipe 300, resulting in a good flushing effect.

[0048] Furthermore, referring to Figure 1 The turbine generator set flushing device also includes a cooler 8 and a heater 7. The cooler 8 is located in the connecting pipeline between the flushing pump 1 and the A1 interface and is used to cool the lubricating oil used for flushing. The input end of the heater 7 is connected to the cooler 8, and the output end of the heater 7 is connected to the A1 interface and is used to heat the lubricating oil used for flushing.

[0049] The lubricating oil pumped by the flushing pump 1 is repeatedly heated and cooled by the heater 7 and the cooler 8. During the heating phase, the heater 7 is energized and turned on, raising the lubricating oil temperature to 60–70°C, making the lubricating oil high-temperature, low-viscosity, and highly active, thus enabling it to polish the internal surfaces of the pipes and achieve a good flushing effect. During the cooling phase, the cooler 8 is energized and turned on, cooling the lubricating oil temperature to 20–35°C. Utilizing the lubricating oil's low-temperature, high-viscosity properties, it carries away heavy particles such as metal shavings, dust, and silt, keeping the lubrication system's pipes clean.

[0050] Furthermore, referring to Figure 1The turbine generator set flushing device also includes a regulating valve 9, which is connected in parallel with the flushing pump 1. The input end of the regulating valve 9 is connected to the outlet of the main oil tank 100, and the output end of the regulating valve 9 is connected to the input end of the filter 2, which is used to regulate the flushing flow rate of the flushing pump 1.

[0051] A bypass pipeline is connected in parallel with the flushing pump 1 at the outlet of the main oil tank 100. A regulating valve 9 is installed on the bypass pipeline. Under different flushing conditions, the flow rate of lubricating oil can be controlled within a set range by adjusting the opening of the regulating valve 9. That is, the larger the opening of the regulating valve 9, the smaller the flow rate of lubricating oil through the flushing pump 1, and vice versa.

[0052] Furthermore, referring to Figure 1 The turbine generator set flushing device also includes a first three-way valve 10 and a second three-way valve 11. There are two oil coolers 200. The first three-way valve 10 has a B1 port, a B2 port and a B3 port. The B1 port can be connected to either the B2 port or the B3 port. The B1 port is connected to the A3 port. The B2 port and the B3 port are respectively connected to the inlets of the two oil coolers 200. The second three-way valve 11 has a C1 port, a C2 port and a C3 port. The C1 port can be connected to either the C2 port or the C3 port. The C1 port is connected to the sleeve oil pipe 300. The C2 port and the C3 port are respectively connected to the outlets of the two oil coolers 200.

[0053] When flushing is required for the oil cooler 200 of the turbine generator set, the A1 and A3 ports are connected, allowing lubricating oil to flush both oil coolers 200 at a high flow rate through the A1 and A3 ports. By operating the first three-way valve 10 and the second three-way valve 11, the B1 and B2 ports are connected, the C1 and C2 ports are connected, and the B1 and B3 ports are disconnected, allowing lubricating oil to flush one of the oil coolers 200. Then, the B1 and B3 ports are connected, the C1 and C3 ports are connected, and the B1 and B2 ports are disconnected, allowing lubricating oil to flush the other oil cooler 200. Repeatedly operating the first three-way valve 10 and the second three-way valve 11 alternately flushes the two oil coolers 200 at a high flow rate.

[0054] Furthermore, referring to Figure 1 The turbine generator set flushing device also includes a permanent magnet grid 12, which is set at the bottom of the bearing housing of the turbine body 600 and inside the main oil tank 100. It is used to adsorb and collect magnetic foreign objects in the lubricating oil, that is, to collect magnetic impurities in time during the flushing process, avoid secondary pollution, and achieve better flushing effect.

[0055] Furthermore, referring to Figure 1The turbine generator set flushing device also includes a vibrator 13, which is installed on the sleeve oil pipe 300 and is used to remove contaminants from the sleeve oil pipe 300.

[0056] The vibrator 13 is an electrically powered micro-vibration device that provides a vibration frequency of 50–150 Hz and a vibration amplitude of 0.05–0.5 Hz. It operates in pulse mode, vibrating for 10 seconds followed by a 5-second pause, repeating this cycle. The vibrator 13 is fixed to the outside of the tubing 300 using an adaptive clamp. The vibrator 13 replaces manual tapping, improving the automation and consistency of the tapping vibration during rinsing, effectively removing deposits from the tubing 300, enhancing contaminant removal, and improving rinsing efficiency and cleanliness.

[0057] Furthermore, referring to Figure 1 The filter screen 4 is detachably connected to the outlet of the oil pipe 300.

[0058] The filter screen 4 is detachably connected to the outlet of the oil pipe 300 via a quick-release structure such as a snap-fit, facilitating disassembly, replacement, and maintenance. During the flushing process, the filter screen 4 should be inspected, cleaned, and replaced regularly. In the early stage of flushing, the filter screen 4 should use a metal coarse filter 2 with a filtration accuracy of 20μm, and in the later stage of flushing, the filter screen 4 should use a glass fiber fine filter 2 with a filtration accuracy of 10μm.

[0059] Example 2

[0060] like Figure 2 As shown, in this embodiment, through the implementation of the above-described turbine generator set flushing device, the turbine generator set flushing method includes the following steps:

[0061] S100: Lubricating oil is flushed in large flow through the A1 and A2 interfaces to the oil supply pipe 400, the oil return pipe 500, and the turbine body 600.

[0062] The input end of flushing pump 1 is connected to the outlet of main oil tank 100, and the input end of filter 2 is connected to the output end of flushing pump 1. The multi-way diverter valve 3 is configured with a one-inlet and three-outlet valve body structure, that is, the A1 port is set as the inlet, and the A2, A3 and A4 ports are set as outlets. The A1 port can select to connect or disconnect any one or more of the A2, A3 and A4 ports. The A1 port is connected to the output end of filter 2, and the A2 port is connected to the inlet of oil supply pipe 400.

[0063] The A1 and A2 interfaces are connected. The lubricating oil is flushed in a large flow through the A1 and A2 interfaces to the oil supply pipe 400, the oil return pipe 500, and the turbine body 600. After the oil is flushed, the A1 and A2 interfaces are disconnected. At the same time, the flushed lubricating oil flows back to the main oil tank 100 through the sleeve oil pipe 300 and is filtered by the filter screen 4 to ensure that the lubricating oil in the main oil tank 100 is free of impurities.

[0064] S200: Lubricating oil flushes the oil cooler 200 at a high flow rate through interfaces A1 and A3.

[0065] The A3 interface connects to the inlet of the oil cooler 200, and the oil outlet of the oil cooler 200 is connected to the sleeve oil pipe 300. The A1 interface is connected to the A3 interface, and the lubricating oil flushes the oil cooler 200 with a large flow rate through the A1 and A3 interfaces. After flushing, the A1 and A3 interfaces are disconnected, and the flushed lubricating oil flows back to the main oil tank 100 through the sleeve oil pipe 300 and is filtered by the filter screen 4 to avoid the risk of secondary contamination.

[0066] S300: Lubricating oil is sprayed through the A1 and A4 interfaces and the nozzle 6 of the high-pressure oil gun 5 is used to spray lubricating oil onto the top wall inside the oil pipe 300 for flushing.

[0067] The A4 interface is connected to the input end of the flexible conduit via a flange, and the high-pressure oil gun 5 is connected to the output end of the flexible conduit. The high-pressure oil gun 5 extends into the interior of the sleeve oil pipe 300 through the inspection port 301. The A1 interface is connected to the A4 interface. Lubricating oil is sprayed through the A1 and A4 interfaces, and the nozzle 6 of the high-pressure oil gun 5 is used to spray the lubricating oil onto the top wall inside the sleeve oil pipe 300. The impurities flushed out are returned to the main oil tank 100 along with the lubricating oil for collection, facilitating secondary use.

[0068] The turbine generator set flushing method provided in this embodiment, through the implementation of the turbine generator set flushing device, uses lubricating oil to flush the oil supply pipe 400, oil return pipe 500, and turbine body 600 at a high flow rate through interfaces A1 and A2; lubricating oil also flushes the oil cooler 200 at a high flow rate through interfaces A1 and A3; and lubricating oil is sprayed onto the top wall inside the sleeve oil pipe 300 through interfaces A1 and A4 using the nozzle 6 of the high-pressure oil gun 5. This method enables coordinated flushing of the turbine body 600, oil supply and return pipes 500, oil cooler 200, and sleeve oil pipe 300 of the turbine generator set, solving the problems of inconvenient flushing and secondary contamination of the shell-and-tube oil cooler 200 in conventional flushing, improving flushing efficiency, and thus shortening the flushing period of the turbine generator set lubrication system. Furthermore, using the high-pressure oil gun 5 to perform targeted flushing of the inner wall of the sleeve oil pipe 300 can improve flushing coverage and flushing efficiency.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A steam turbine generator set flushing device for flushing a steam turbine generator set, the steam turbine generator set including a turbine body (600) and a lubrication oil system, the lubrication oil system including a main oil tank (100), an oil cooler (200), an oil supply pipe (300), an oil supply pipe (400), and a return oil pipe (500), the main oil tank (100) being connected to the oil cooler (200), the oil supply pipe (400), and the return oil pipe (500) via the oil supply pipe (300), the steam turbine body (600) being connected to the oil supply pipe (400) and the return oil pipe (500), characterized in that, The turbine generator set flushing device includes: A flushing pump (1), the input end of which is connected to the outlet of the main oil tank (100); The filter (2) has its input end connected to the output end of the flushing pump (1); A multi-way diverter valve (3) has an A1 port, an A2 port, an A3 port and an A4 port. The A1 port can be connected or disconnected from the A2 port, the A3 port and the A4 port. The A1 port is connected to the output end of the filter (2). The A2 port is connected to the inlet of the oil supply pipe (400). The A3 port is connected to the inlet of the oil cooler (200). A filter screen (4) is provided at the outlet of the sleeve oil pipe (300); The flushing assembly includes a high-pressure oil gun (5) and a nozzle (6). The input end of the high-pressure oil gun (5) is connected to the A4 interface, and the output end of the high-pressure oil gun (5) is connected to the nozzle (6). The high-pressure oil gun (5) is fixedly installed through the inspection port (301) of the sleeve oil pipe (300). The spray direction of the nozzle (6) is towards the top wall inside the sleeve oil pipe (300) and is used to flush the impurities on the inner wall of the sleeve oil pipe (300).

2. The turbine generator set flushing device according to claim 1, characterized in that, The nozzle (6) is provided with multiple nozzles, and the lubricating oil sprayed from the multiple nozzles is radial.

3. The turbine generator set flushing device according to claim 1, characterized in that, There are multiple nozzles (6), and multiple nozzles (6) are arranged at intervals along the axial direction of the sleeve oil pipe (300).

4. The turbine generator set flushing device according to claim 1, characterized in that, The turbine generator set flushing device also includes a cooler (8), which is located in the connecting pipeline between the flushing pump (1) and the A1 interface and is used to cool the lubricating oil used for flushing.

5. The turbine generator set flushing device according to claim 4, characterized in that, The turbine generator set flushing device also includes a heater (7), the input end of which is connected to the cooler (8), and the output end of which is connected to the A1 interface and used to heat the lubricating oil used for flushing.

6. The turbine generator set flushing device according to claim 1, characterized in that, The turbine generator set flushing device also includes a regulating valve (9), which is connected in parallel with the flushing pump (1). The input end of the regulating valve (9) is connected to the outlet of the main oil tank (100), and the output end of the regulating valve (9) is connected to the input end of the filter (2) to regulate the flushing flow rate of the flushing pump (1).

7. The turbine generator set flushing device according to claim 1, characterized in that, The turbine generator set flushing device also includes a first three-way valve (10) and a second three-way valve (11). There are two oil coolers (200). The first three-way valve (10) has a B1 port, a B2 port and a B3 port. The B1 port can be connected to either the B2 port or the B3 port. The B1 port is connected to the A3 port. The B2 port and the B3 port are respectively connected to the inlets of the two oil coolers (200). The second three-way valve (11) has a C1 port, a C2 port and a C3 port. The C1 port can be connected to either the C2 port or the C3 port. The C1 port is connected to the sleeve oil pipe (300). The C2 port and the C3 port are respectively connected to the outlets of the two oil coolers (200).

8. The turbine generator set flushing device according to claim 1, characterized in that, The turbine generator set flushing device also includes a permanent magnet grid (12), which is installed at the bottom of the bearing housing of the turbine body (600) and inside the main oil tank (100) and is used to adsorb and collect magnetic foreign objects in the lubricating oil.

9. The turbine generator set flushing device according to claim 1, characterized in that, The filter (4) is detachably connected to the outlet of the sleeve oil pipe (300).

10. A method for flushing a steam turbine generator set, characterized in that, By implementing the steam turbine generator set flushing device as described in any one of claims 1-9, the steam turbine generator set flushing method includes: S100: Lubricating oil is used to flush the oil supply pipe (400), the oil return pipe (500), and the turbine body (600) in a large flow rate through the A1 and A2 interfaces; S200: Lubricating oil flushes the oil cooler (200) at a high flow rate through the A1 and A3 interfaces; S300: Lubricating oil is sprayed onto the top wall of the sleeve oil pipe (300) through the A1 interface and the A4 interface, and the nozzle (6) of the high-pressure oil gun (5) is used to flush the lubricating oil.

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