Large-flow flushing device for lubricating oil of steam turbine generator

Abstract

The utility model relates to the technical field of steam turbine generator lubricating oil flushing, in particular to a steam turbine generator lubricating oil large-flow flushing device which comprises a base, an electric control cabinet, a flushing assembly and a cleaning assembly, the flushing assembly and the cleaning assembly are both connected with the electric control cabinet, and the flushing assembly comprises a first flow pump, a filtering part and a heater. The first flow pump, the filtering part, the heater and the steam turbine generator lubricating oil system are sequentially communicated end to end to form a circulating cleaning loop; the cleaning assembly comprises a blowdown tank, a second flow pump and an oil storage tank, an oil outlet pipe of the heater is communicated with the oil storage tank, the input end of the second flow pump is communicated with the oil storage tank, the output end of the second flow pump is communicated with the output end of the filtering part, and the input end of the filtering part is further communicated with the blowdown tank through a first switch valve. The flow speed is increased, oil liquid is continuously purified, the circulation period is shortened, the oil filter can be cleaned, the disassembly, washing or replacement frequency of the oil filter is reduced, and the service life of the oil filter is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine generator lubricating oil flushing, and specifically discloses a large-flow flushing device for steam turbine generator lubricating oil. Background Technique

[0002] During the construction process of thermal power generation projects, the lubricating oil system of steam turbine generator sets is an important auxiliary system of steam turbine generator sets. Its main functions are to provide lubricating oil for the support bearings, thrust bearings and turning gear devices of steam turbine generator sets, to provide low-pressure safety oil for steam turbines, and to provide a standby oil source for the steam turbine seal oil system to ensure the needs of the unit under normal operating conditions and accident conditions. The quality of lubricating oil is directly related to the safe and economic operation of the unit equipment. The particle size, moisture, viscosity and anti-emulsifier performance of impurities in the oil are all crucial. Especially, if there are a little impurities in the oil, it will cause serious consequences such as journal and bearing bush wear. Therefore, flushing the steam turbine bearing box, oil tank and oil system pipeline by means of circulating oil filtration is an important process in the installation and commissioning of steam turbines. Whether the circulating oil filtration flushing method is reasonable directly affects the normal operation of the steam turbine and even endangers the safety of the steam turbine.

[0003] In the prior art, the lubricating oil flushing system of steam turbine generators uses plate-type oil filters. The filtering components generally consist of multiple layers of filter meshes. The oil filtering means is single, the circulation period is long, and the disassembly and replacement of the filtering components are relatively cumbersome. If the oil filter is not cleaned, the later flushing efficiency is likely to decrease. Content of the Utility Model

[0004] The purpose of the utility model is to provide a large-flow flushing device for steam turbine generator lubricating oil to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A large-flow flushing device for steam turbine generator lubricating oil, including a base, an electric control cabinet, a flushing component and a cleaning component. The electric control cabinet, the flushing component and the cleaning component are all arranged on the base. The flushing component and the cleaning component are both connected to the electric cabinet. The flushing component includes a first flow pump, a filtering part and a heater. The first flow pump, the filtering part and the heater are connected in series end to end with the steam turbine generator lubricating oil system in sequence to form a circulating cleaning loop. The cleaning component includes a sewage discharge tank, a second flow pump and an oil storage tank. The oil outlet pipe of the heater is also connected to the oil storage tank. The input end of the second flow pump is connected to the oil storage tank. The output end of the second flow pump is connected to the output end of the filtering part. The input end of the filtering part is also connected to the sewage discharge tank through a first switching valve.

[0006] Further, the flushing assembly further includes a first sampling valve. The first flow pump, the heater, and the filtering part are all fixedly arranged on the upper surface of the base. A main oil inlet and a secondary oil inlet are arranged on the oil inlet pipe of the first flow pump. The main oil inlet is communicated with the lubricating oil system of the steam turbine generator through the first sampling valve arranged thereon, and the secondary oil inlet is communicated with the lower end of the sewage discharge tank through a second switching valve.

[0007] Further, the flushing assembly further includes a flow regulating valve. The input end of the filtering part is communicated with the output end of the first flow pump through the flow regulating valve. The output end of the filtering part is communicated with the input end of the heater through a third switching valve. A main output port and a secondary output port are arranged on the oil outlet pipe of the heater. The main output port is communicated with the lubricating oil system of the steam turbine generator, and the secondary output port is communicated with the oil storage tank. A flow valve is arranged between the oil storage tank and the heater.

[0008] Further, the cleaning assembly further includes a regulating valve. The sewage discharge tank, the second flow pump, and the oil storage tank are all fixedly arranged on the upper surface of the base. A regulating valve is arranged between the second flow pump and the filtering part.

[0009] Further, the cleaning assembly further includes a second sampling valve. The lower end of the sewage discharge tank is communicated with the secondary oil inlet of the oil inlet pipe of the first flow pump through the second sampling valve, and a second switching valve is arranged between the second sampling valve and the first flow pump.

[0010] Further, a filter screen is arranged inside the sewage discharge tank. A tank cover is arranged on the top of the sewage discharge tank. The tank cover is threadedly connected to the top of the sewage discharge tank. A support platform is arranged at the lower end inside the sewage discharge tank. The bottom of the filter screen contacts or separates from the support platform. The filter screen is slidably connected or separated from the upper end inside the sewage discharge tank. A handle is rotatably arranged at the upper end of the filter screen.

[0011] Further, the filtering part includes a first oil filter and a second oil filter. The output end of the first oil filter is communicated with the input end of the second oil filter. A main inlet and a secondary inlet are arranged at the input end of the first oil filter. The main inlet is communicated with the output end of the first flow pump, and the secondary inlet is communicated with the sewage discharge tank. A main outlet and a secondary outlet are arranged at the output end of the second oil filter. The main outlet is communicated with the input end of the heater, and the secondary outlet is communicated with the oil storage tank.

[0012] Further, the base includes universal wheels and a push handle. Four universal wheels are arranged, and the four universal wheels are respectively arranged at the four corners of the lower surface of the base. The push handle is fixedly arranged at one end of the upper surface of the base.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. A large-flow flushing device for the lubricating oil of a steam turbine generator provided by the present utility model combines a first flow pump, a flow regulating valve, a first oil filter, and a second oil filter, which can increase the flushing flow rate, raise the flow velocity, continuously purify the oil, and shorten the circulation period.

[0015] 2. A large-flow flushing device for the lubricating oil of a steam turbine generator provided by the present utility model can clean the filtering part, improve the working efficiency, reduce the disassembly or replacement frequency of the filtering part, and extend the service life of the filtering part by adding a second flow pump to pump the filtered oil for reverse flushing of the first oil filter and the second oil filter.

[0016] 3. A large-flow flushing device for the lubricating oil of a steam turbine generator provided by the present utility model stores the oil after reverse flushing the filtering part in a sewage discharge tank. A filter screen is arranged in the sewage discharge tank. The oil in the sewage discharge tank is filtered through the filter screen in the sewage discharge tank, and the oil in the sewage discharge tank is sampled and detected through a second sampling valve. If it meets the standard, the valve can be opened to communicate with the first flow pump for continuous recycling, saving costs.

[0017] 4. A large-flow flushing device for the lubricating oil of a steam turbine generator provided by the present utility model flushes the pipeline outside the bearing box in the first stage and flushes the official oil inlet and outlet pipelines and bearing components where the bearing bush is located in the second stage. It adopts a pure physical flushing method, with high flushing efficiency, comprehensive flushing, high oil purification degree, and simple and convenient operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a large-flow flushing device for the lubricating oil of a steam turbine generator according to an embodiment of the present utility model;

[0019] Figure 2 is a top view structural diagram according to an embodiment of the present utility model;

[0020] Figure 3 is a schematic sectional structure diagram of the sewage discharge tank according to an embodiment of the present utility model.

[0021] In the figure: 1, base; 11, universal wheel; 12, push handle; 2, electric control cabinet; 3, flushing assembly; 31, first flow pump; 32, first sampling valve; 33, filtering part; 331, first oil filter; 332, second oil filter; 34, flow regulating valve; 35, heater; 36, oil inlet pipe; 37, oil outlet pipe; 4, cleaning assembly; 41, sewage discharge tank; 411, filter screen; 412, support platform; 413, handle; 414, tank cover; 42, second sampling valve; 43, second flow pump; 44, regulating valve; 45, oil storage tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] In the following description of the utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The term "connection" only represents the connection between devices and has no special meaning.

[0024] In addition, as long as there is no conflict between the technical fields and installation methods involved in the embodiments of the present utility model described below, they can be combined with each other.

[0025] Specific embodiments are as Figures 1 - 3 shown. A large-flow flushing device for the lubricating oil of a steam turbine generator includes a base 1, an electric control cabinet 2, a flushing assembly 3, and a cleaning assembly 4. The electric control cabinet 2, the flushing assembly 3, and the cleaning assembly 4 are all arranged on the base 1. The flushing assembly 3 and the cleaning assembly 4 are both controlled by the electric control cabinet 2 to operate. The flushing assembly 3 includes a first flow pump 31, a filtering part 33, and a heater 35. The first flow pump 31, the filtering part 33, and the heater 35 are sequentially connected end to end with the steam turbine generator lubricating oil system to form a circulating cleaning circuit. The cleaning assembly 4 includes a sewage discharge tank 41, a second flow pump 43, and an oil storage tank 45. The oil outlet pipe 37 of the heater 35 is also connected to the oil storage tank 45. The input end of the second flow pump 43 is connected to the oil storage tank 45. The output end of the second flow pump 43 is connected to the output end of the filtering part 33. The input end of the filtering part 33 is also connected to the sewage discharge tank 41 through a first switching valve. This setting can store a part of the oil liquid cleaned by the flushing assembly 3 in the oil storage tank 45, and flush the filtering part 33 in the reverse direction, reducing the disassembly or replacement frequency of the filtering part 33, improving work efficiency, and extending the service life of the filtering part 33.

[0026] The base 1 includes universal wheels 11 and a push handle 12. Four universal wheels 11 are provided, and the four universal wheels 11 are respectively arranged at the four corners of the lower surface of the base 1. The push handle 12 is fixedly arranged at one end of the upper surface of the base 1, which is convenient to move the device to the vicinity of the steam turbine generator that needs to be flushed.

[0027] The flushing assembly 3 further includes a first sampling valve 32 and a flow regulating valve 34. The first flow pump 31, the heater 35, and the filtering section 33 are all fixedly arranged on the upper surface of the base 1. A main oil inlet and a secondary oil inlet are arranged on the oil inlet pipe 36 of the first flow pump 31. Among them, the main oil inlet is communicated with the lubricating oil system of the steam turbine generator through the first sampling valve 32 provided, and this setting can sample and detect the cleanliness of the oil in the main oil tank to observe whether flushing is needed again; the secondary oil inlet is communicated with the lower end of the sewage discharge tank 41 through a second switching valve; the output end of the first flow pump 31 is communicated with the input end of the filtering section 33 through the flow regulating valve 34. The output end of the filtering section 33 is communicated with the input end of the heater 35 through a third switching valve. A main output port and a secondary output port are arranged on the oil outlet pipe 37 of the heater 35. Among them, the main output port is communicated with the lubricating oil system of the steam turbine generator, and the secondary output port is communicated with the storage tank 45. A flow valve is arranged between the storage tank 45 and the heater 35. This setting can pump a large amount of oil through the flow regulating valve 34 into the filtering section 33 by the first flow pump 31 for filtering and cleaning, which can increase the flushing flow rate, improve the flow velocity, continuously purify the oil, shorten the circulation period, and then enter the heater 35 to heat and reduce the viscosity of the oil, facilitating the flow of the oil for flushing.

[0028] The cleaning assembly 4 further includes a second sampling valve 42 and a regulating valve 44. The sewage discharge tank 41, the second flow pump 43, and the storage tank 45 are all fixedly arranged on the upper surface of the base 1. A regulating valve 44 is arranged between the second flow pump 43 and the filtering section 33 to prevent oil from entering the second flow pump 43 when the flushing assembly 3 is in use; the lower end of the sewage discharge tank 41 is communicated with the secondary oil inlet of the oil inlet pipe 36 of the first flow pump 31 through the second sampling valve 42. This setting can store a part of the oil heated by the heater 35 in the storage tank 45 and pump the oil in the storage tank 45 to reversely flush the filtering section 33; a second switching valve is arranged between the second sampling valve 42 and the first flow pump 31, and this setting can prevent the oil in the main oil tank from accidentally flowing into the second sampling valve 42; a filter screen 411 is arranged in the sewage discharge tank 41. The oil after flushing the filtering section 33 enters the sewage discharge tank 41 and passes through the filter screen 411 and then through the second sampling valve 42, and the sampled oil can be observed to see if it meets the standard. If it meets the standard, it enters the first flow pump 31 for continuous recycling; a tank cover 414 is arranged on the top of the sewage discharge tank 41, and the tank cover 414 is threadedly connected to the top of the sewage discharge tank 41. A support platform 412 is arranged at the lower end inside the sewage discharge tank 41. The bottom of the filter screen 411 contacts or separates from the support platform 412, and the filter screen 411 is slidably connected or separated from the upper end inside the sewage discharge tank 41. A handle 413 is rotatably arranged at the upper end of the filter screen 411, which is convenient for taking out the filter screen 411 for cleaning.

[0029] The filtering section 33 includes a first oil filter 331 and a second oil filter 332. The output end of the first oil filter 331 is communicated with the input end of the second oil filter 332. The combination of the first oil filter 331 and the second oil filter 332 can better filter the oil fluid and improve the filtering effect. The input end of the first oil filter 331 is provided with a main inlet and a secondary inlet. The main inlet is communicated with the output end of the first flow pump 31, and the secondary inlet is communicated with the sewage tank 41. The output end of the second oil filter 332 is provided with a main outlet and a secondary outlet. The main outlet is communicated with the input end of the heater 35, and the secondary outlet is communicated with the oil storage tank 45.

[0030] When a large-flow flushing device for the lubricating oil of a steam turbine generator is in use, it is carried out in two stages. In the first stage, the external pipeline of the bearing box is flushed. There are two circuits in total. The first circuit flushes the main oil pump pipeline. Lubricating oil is injected into the main oil tank of the steam turbine generator lubricating oil system to the highest oil level. The smoke exhaust device of the main oil tank is started. The inlet pipe 36 of this flushing device is communicated with the main oil tank. The main output port of the outlet pipe 37 of the heater 35 is communicated with the outlet pipeline of the main oil pump. The inlet pipeline of the main oil pump is communicated with the main oil tank for circulating flushing. Open multiple valve bodies on the first flow pump 31, the filtering section 33, the heater 35 and the flushing assembly 3. Observe the temperature and oil pressure of the oil fluid through the electric control cabinet 2. Circulatingly flush the main oil pump pipeline. When flushing, the heater 35 is turned on at a set temperature interval for a specific period of time, and the lubricating oil flushes the pipeline with alternating cold and heat changes.

[0031] The second circuit flushes the supply and return oil pipelines connecting the bearings. Build a temporary supply and return oil pipeline. The lubricating oil bypasses the formal supply and return oil pipelines where the bearing bushes are located. The inlet pipe 36 of this flushing device is still communicated with the main oil tank. The main output port of the outlet pipe 37 of the heater 35 is communicated with the temporary supply and return oil pipeline. The temporary supply and return oil pipeline is communicated with the main oil tank. The temporary supply and return oil pipeline is also communicated with the supply and return oil pipelines from the main oil tank to the bearings. Open multiple valve bodies on the first flow pump 31, the filtering section 33, the heater 35 and the flushing assembly 3 again to circulate and flush the supply and return oil pipelines connecting the bearings. After flushing, sample and detect the oil fluid in the main oil tank through the first sampling valve 32. If it meets the standard, the flushing ends. When flushing, the heater 35 is turned on at a set temperature interval for a specific period of time, and the lubricating oil flushes the pipeline with alternating cold and heat changes.

[0032] Then, perform the second-stage restoration system flushing. Remove the temporary inlet and return oil pipelines, and restore the use of the formal inlet and return oil pipelines where the bearing bushes are located in the steam turbine generator lubricating oil system. Inject lubricating oil into the main oil tank of the steam turbine generator lubricating oil system to the highest oil level. Start the main oil tank smoke exhaust device. Connect the inlet pipe 36 of this flushing device to the main oil tank. Connect the main output port of the outlet pipe 37 of the heater 35 to the formal inlet and return oil pipelines where the bearing bushes are located. Connect the main oil tank to the formal inlet and return oil pipelines where the bearing bushes are located, and flush the internal formal inlet and return oil pipelines and bearing components of the steam turbine generator lubricating oil system. After the flushing is completed, take a sample for detection from the first sampling valve 32 again. After the detection is qualified, end the flushing. When flushing, the heater 35 is turned on at a set temperature interval for a specific period of time, and the lubricating oil alternately changes between hot and cold to flush the pipeline;

[0033] During the flushing process, if it is necessary to clean the filtering part 33, open the flow valve between the heater 35 and the storage oil tank 45, and temporarily store a part of the oil fluid in the storage oil tank 45. After the flushing is completed, close the multiple valve bodies and each component on the flushing assembly 3, and open the second flow pump 43, the regulating valve 44, and the first switching valve, so that the second flow pump 43 pumps the previously filtered oil fluid from the storage oil tank 45 and flows towards the filtering part 33 to reversely flush the second oil filter 332 and the first oil filter 331. After the flushing is completed, take a sample to detect the oil fluid in the sewage discharge tank 41 through the second sampling valve 42. If it meets the standard, it is left in the sewage discharge tank 41. Open the second switching valve connected to the first flow pump 31 and continue to use it in a cycle. If it does not meet the standard, it is cleaned up; The box cover 414 can be rotated when the flushing device flushes the steam turbine generator lubricating oil system, open the sewage discharge tank 41, observe the degree of dirt on the filter screen 411, and clean the filter screen 411.

[0034] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large flow flushing device for lubricating oil of a steam turbine generator, characterized in that: It includes a base, an electric control cabinet, a flushing component and a cleaning component, which are all arranged on the base, and are connected to the electric cabinet. The flushing component includes a first flow pump, a filter part and a heater, and the first flow pump, the filter part, the heater and the steam turbine generator lubricating oil system are connected end to end in sequence to form a circulating cleaning loop; the cleaning component includes a sewage tank, a second flow pump and an oil storage tank, the oil outlet pipe of the heater is also connected to the oil storage tank, the input end of the second flow pump is connected to the oil storage tank, the output end of the second flow pump is connected to the output end of the filter part, and the input end of the filter part is also connected to the sewage tank through the first switch valve.

2. A large flow flushing device for lubricating oil of a steam turbine generator according to claim 1, characterized in that: The flushing assembly also includes a first sampling valve, a first flow pump, a heater and a filter part are all fixedly arranged on the upper surface of the base, and a main oil inlet and an auxiliary oil inlet are arranged on the oil inlet pipe of the first flow pump, wherein the main oil inlet is connected to the steam turbine generator lubricating oil system through the first sampling valve, and the auxiliary oil inlet is connected to the lower end of the sewage tank through the second switch valve.

3. A large flow flushing device for lubricating oil of a steam turbine generator according to claim 1, characterized in that: The flushing component also includes a flow regulating valve, the filter input end is connected to the first flow pump output end through the flow regulating valve, the filter output end is connected to the heater input end through the third switch valve, and the heater oil outlet pipe is provided with a main output port and a secondary output port, wherein the main output port is connected to the steam turbine generator lubricating oil system, and the secondary output port is connected to the oil storage tank, and a flow valve is provided between the oil storage tank and the heater.

4. A large flow flushing device for lubricating oil of a steam turbine generator according to claim 1, characterized in that: The cleaning component also includes a regulating valve. The sewage tank, the second flow pump and the oil storage tank are all fixedly arranged on the upper surface of the base. A regulating valve is arranged between the second flow pump and the filter part.

5. A large flow flushing device for lubricating oil of a steam turbine generator according to claim 1, characterized in that: The cleaning assembly also includes a second sampling valve, the lower end of the sewage tank is connected to the auxiliary oil inlet of the oil inlet pipe of the first flow pump through the second sampling valve, and a second switch valve is arranged between the second sampling valve and the first flow pump.

6. A large flow flushing device for lubricating oil of a steam turbine generator according to claim 1, characterized in that: A filter is arranged in the sewage box, a box cover is arranged on the top of the sewage box, the box cover is threadedly connected to the top of the sewage box, a support platform is arranged at the lower end of the sewage box, the bottom of the filter is in contact with or separated from the support platform, the filter is slidably connected or separated from the upper end of the sewage box, and a handle is rotatably arranged on the upper end of the filter.

7. A large flow flushing device for lubricating oil of a steam turbine generator according to claim 1, characterized in that: The filtering part includes a first oil filter and a second oil filter, the output end of the first oil filter is connected to the input end of the second oil filter, the input end of the first oil filter is provided with a main inlet and a secondary inlet, wherein the main inlet is connected to the output end of the first flow pump, and the secondary inlet is connected to the sewage tank, and the output end of the second oil filter is provided with a main outlet and a secondary outlet, wherein the main outlet is connected to the input end of the heater, and the secondary outlet is connected to the oil storage tank.

8. A large flow flushing device for lubricating oil of a steam turbine generator according to claim 1, characterized in that: The base comprises universal wheels and a push handle, wherein four universal wheels are arranged, and the four universal wheels are respectively arranged at four corners of the lower surface of the base, and the push handle is fixedly arranged at one end of the upper surface of the base.

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