CN114198162B

CN114198162B - Oil supply device for bearing box of steam turbine

Info

Publication number: CN114198162B
Application number: CN202111449593.6A
Authority: CN
Inventors: 杜岩; 丁孟辉; 杨旭; 孙靖; 李占东; 方聪聪
Original assignee: Tianjin Guoneng Jinneng Thermal Power Co ltd
Current assignee: Tianjin Guoneng Jinneng Thermal Power Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2023-06-23
Anticipated expiration: 2041-11-30
Also published as: CN114198162A

Abstract

The invention discloses a steam turbine bearing box oil supply device, which belongs to the technical field of steam turbines and comprises a lubrication oil supply mechanism which is communicated with a steam turbine bearing box and is used for supplying lubricating oil to the steam turbine bearing box, a control oil supply mechanism which is communicated with a current driver of the steam turbine bearing box and is used for supplying control oil, a transition oil supply mechanism which is used for collecting oil to be changed in the control oil supply mechanism and conveying the oil to the lubrication oil supply mechanism, an accident oil supply mechanism which is communicated with the lubrication oil supply mechanism and is used for continuously supplying the lubricating oil to the steam turbine bearing box without rapidly interrupting the lubricating oil, and an exhaust mechanism which is arranged on the lubrication oil supply mechanism and is used for extracting gas, oil fume and water vapor in the lubrication oil supply mechanism. The method can improve oil quality, reduce the mutual influence of oil pressure between lubricating oil and control oil, and further improve the running reliability and stability of the steam turbine.

Description

Oil supply device for bearing box of steam turbine

Technical Field

The invention relates to the technical field of steam turbines, in particular to an oil supply device for a bearing box of a steam turbine.

Background

At present, in the power generation process, particularly in the thermal power generation process, a steam turbine is commonly used for driving a generator to generate power, and in the related technology, the steam turbine adopts a centralized oil supply system which mainly comprises an oil tank, an oil pump, a main oil pump, a smoke exhaust ventilator, an oil cooler, a double-cylinder oil filter, a meter, a valve and an oil supply pipeline, wherein lubricating oil and control oil of a bearing box of the steam turbine are conveyed from the oil tank to the bearing box by different oil pumps. The lubricating oil and the control oil adopt a centralized oil supply mode, and the conditions of large oil pressure mutual influence and poor oil quality easily occur, so that the operation reliability and stability of the steam turbine are affected.

Accordingly, there is a need for a steam turbine bearing housing oil supply apparatus that ameliorates the above-described problems.

Disclosure of Invention

In order to improve the oil quality and reduce the mutual influence of oil pressure between lubricating oil and control oil, and further improve the running reliability and stability of a steam turbine, the application provides an oil supply device for a bearing box of the steam turbine.

The application provides a steam turbine bearing box oil supply device adopts following technical scheme:

an oil supply device for a bearing housing of a steam turbine, comprising:

the lubrication oil supply mechanism comprises a main oil pump arranged on a steam turbine bearing, a lubrication oil pipeline, a main oil tank, an oil injector, an oil pump group, a first oil cooler and a first oil filter group, wherein one end of the lubrication oil pipeline is communicated with the main oil pump;

the oil supply control mechanism comprises a secondary oil tank, a control oil pipeline, a control oil pump group, an overflow valve, a second oil cooler, an energy accumulator and a second oil filter, wherein one end of the control oil pipeline is communicated with a current driver of a steam turbine bearing box, the control oil pump group is arranged in the secondary oil tank and is communicated with the control oil pipeline, the overflow valve is arranged on the control oil pipeline, the second oil cooler is communicated with the overflow valve through the control oil pipeline, the energy accumulator is communicated with the overflow valve through the control oil pipeline, and the second oil filter is arranged on the control oil pipeline and is positioned between the overflow valve and the energy accumulator;

the transition oil conveying mechanism comprises a transition oil conveying pipeline, a transition oil tank and a transition oil pump group, wherein one end of the transition oil conveying pipeline is communicated with the auxiliary oil tank, the transition oil tank is communicated with the transition oil conveying pipeline, and the transition oil pump group is arranged in the transition oil tank and is communicated with the main oil tank through the transition oil conveying pipeline;

the accident oil conveying mechanism is communicated with the main oil tank and is used for continuously supplying oil to the steam turbine bearing so as not to rapidly interrupt lubricating oil; and

and the exhaust mechanism is arranged on the main oil tank and is used for extracting gas, oil fume and water vapor in the main oil tank.

By adopting the technical scheme, the lubricating oil and the control oil required by the bearing box of the steam turbine are separated, the transition oil conveying mechanism can convey the used control oil in the control oil conveying mechanism into the lubricating oil conveying mechanism to be used as lubricating oil, waste is reduced, the lubricating oil conveying mechanism provides lubricating oil, the control oil conveying mechanism provides the control oil, and the oil of the main oil tank cannot flow into the auxiliary oil tank, so that the effects of improving the oil quality and reducing the mutual influence of the lubricating oil and the oil pressure between the control oil are achieved, and the running reliability and stability of the steam turbine are improved.

Optionally, a filter screen frame for surrounding the lubricator is arranged in the main oil tank.

Through adopting above-mentioned technical scheme, the filter screen frame can be with the lubricating oil in the main oil tank filter back again carry out the oil transportation to lubricated oil pipeline through the grease squirt, makes the impurity in the lubricating oil of carrying the main oil pump less.

Optionally, an overpressure valve is arranged on the lubricating oil pipeline at a position between the first oil filter group and the main oil tank.

By adopting the technical scheme, when the pressure of the lubricating oil is too high, redundant flow can flow back to the main oil tank through the overpressure valve, so that all mechanisms in the whole oil supply device are protected from being damaged due to the too high pressure.

Optionally, the positions, close to the oil inlet end of the bearing box of the steam turbine, on the lubricating oil conveying pipeline are all provided with second oil filters.

By adopting the technical scheme, the second oil filter can further filter the lubricating oil which is about to enter the bearing box of the steam turbine, reduce impurities in the lubricating oil, and further ensure that the quality of the lubricating oil is better.

Optionally, the oil pump group comprises a high-pressure oil pump, an alternating-current lubricating oil pump and a direct-current lubricating oil pump, wherein one end of the high-pressure oil pump is communicated with the oil injector through a lubricating oil pipeline, the alternating-current lubricating oil pump is communicated with the other end of the high-pressure oil pump through the lubricating oil pipeline, and the direct-current lubricating oil pump is arranged on the lubricating oil pipeline and is connected with the alternating-current lubricating oil pump in parallel;

the alternating-current lubricating oil pump and the direct-current lubricating oil pump are communicated with the oil lubricator through a lubricating oil pipeline.

Through adopting above-mentioned technical scheme, high pressure oil pump mainly used provides lubricating oil and security oil for whole steam turbine system, needs to use the alternating current lubrication oil pump when steam turbine jigger, and when steam turbine made lubricating oil pressure lower than the limit value and the unable operation of alternating current lubrication oil pump because of the trouble, direct current lubrication oil pump was used for providing lubricating oil pressure for steam turbine, makes steam turbine can be safe stop, avoids taking place the oil-break and grinds tile accident.

Optionally, the number of the first oil coolers is two and the first oil coolers are mutually connected in parallel.

By adopting the technical scheme, the first oil cooler can be in a standby state, and the normal operation of the steam turbine is prevented from being influenced by maintenance.

Optionally, the number of the energy storages is plural and connected in parallel with each other.

Through adopting above-mentioned technical scheme, the quantity of energy storage is a plurality of, increases energy storage performance, and then makes the release performance of storing whole lubrication oil feed mechanism better.

Optionally, a check valve is arranged on a transitional oil pipeline between the transitional oil tank and the auxiliary oil tank.

Through adopting above-mentioned technical scheme, the setting of check valve can prevent the backward flow in the transition oil tank to in the bellytank to avoid in the bellytank exhaust waste oil backward flow, increase work load for the oil change operation of later stage exhaust and bellytank.

Optionally, the transition oil conveying mechanism further comprises an oil discharge pipeline communicated with the transition oil tank, a settling tank communicated with the oil discharge pipeline, an oil discharge pipeline with one end communicated with the settling tank and an oil discharge pump arranged on the oil discharge pipeline;

the other end of the oil discharge pipeline is communicated with the main oil tank.

Through adopting above-mentioned technical scheme, the deposit box can deposit the impurity removal with the exhaust oil in transition oil tank and the main oil tank back, is carried back in the main oil tank from the oil drain pipeline with oil again by the oil drain pump, makes the life of lubricating oil longer and the oil quality better.

Optionally, a filter plate is arranged in the sedimentation tank, and the filter plate divides the area in the sedimentation tank into a sedimentation area and an oil storage area.

By adopting the technical scheme, the filter plate can filter the oil which is precipitated from the precipitation zone and then flows into the oil storage zone, and then is pumped into the main oil tank from the oil storage zone.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the lubricating oil and the control oil required by the bearing box of the steam turbine are provided separately, the transition oil conveying mechanism can convey the used control oil in the control oil conveying mechanism into the lubricating oil conveying mechanism to serve as lubricating oil, waste is reduced, the lubricating oil conveying mechanism provides lubricating oil, the control oil conveying mechanism provides control oil, and the oil of the main oil tank cannot flow into the auxiliary oil tank, so that the effects of improving the oil quality and reducing the mutual influence of the lubricating oil and the oil pressure between the control oil are achieved, and the running reliability and stability of the steam turbine are further improved;

2. the filter screen frame can filter the lubricating oil in the main oil tank and then convey the lubricating oil to the lubricating oil conveying pipeline through the oil injector, so that the impurities in the lubricating oil conveyed to the main oil pump are less;

3. the sedimentation tank can carry out sediment edulcoration with the oil of the discharge in transition oil tank and the main oil tank back in the main oil tank with oil from oil drain pipeline by the oil drain pump again, makes the life of lubricating oil longer and the oiliness better.

Drawings

Fig. 1 is an overall oil supply schematic diagram of a steam turbine bearing housing oil supply device according to an embodiment of the present disclosure.

FIG. 2 is an overall oil supply schematic of another steam turbine bearing housing oil supply apparatus disclosed in an embodiment of the present application.

Fig. 3 is a schematic structural view of an exhaust mechanism in an embodiment of the present application.

Reference numerals illustrate:

1. a lubrication oil supply mechanism; 11. a main oil pump; 12. lubricating an oil pipeline; 1200. a first lubricating oil pipe; 1201. a second lubricating oil pipe; 1202. a third lubricating oil pipe; 1203. a fourth lubricating oil pipe; 1204. a fifth lubricating oil pipe; 1205. a sixth lubrication pipe; 1206. a seventh lubrication pipe; 1207. an eighth lubrication pipe; 1208. a ninth lubrication pipe; 121. an overpressure valve; 122. a second oil filter; 13. A main oil tank; 131. a filter screen frame; 14. an oil injector; 141. a low pressure lubricator; 142. a high pressure lubricator; 15. an oil pump unit; 151. a high pressure oil pump; 152. an alternating current lubrication pump; 153. a direct current lubrication pump; 16. a first oil cooler; 17. a first oil filter group;

2. controlling an oil supply mechanism; 21. an auxiliary oil tank; 22. controlling an oil pipeline; 2200. a first control oil pipe; 2201. a second control oil pipe; 2202. a third control oil pipe; 2203. a fourth control oil pipe; 2204. a fifth control oil pipe; 2205. a sixth control oil pipe; 23. controlling an oil pump group; 24. an overflow valve; 25. a second oil cooler; 26. an energy storage; 27. a second oil filter;

3. a transitional oil conveying mechanism; 31. a transitional oil delivery pipeline; 3100. a first transition oil pipe; 3101. a second transition oil pipe; 311. a non-return valve; 32. a transition oil tank; 33. a transitional oil pump set; 34. an oil discharge pipeline; 3400. a first oil drain pipe; 3401. a second oil drain pipe; 35. a sedimentation tank; 350. a precipitation zone; 351. an oil storage area; 36. an oil discharging pipeline; 37. a discharge pump; 38. a filter plate;

4. an accident oil delivery mechanism; 41. an accident oil delivery pipe; 42. an accident oil tank; 43. an accident oil delivery pump; 44. an accident oil drain pipe;

5. an exhaust mechanism; 51. an exhaust duct; 52. an exhaust fan.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-3.

The embodiment of the application discloses a steam turbine bearing housing oil supply device, referring to fig. 1, the steam turbine bearing housing oil supply device comprises a lubrication oil supply mechanism 1 which is communicated with a steam turbine bearing housing and is used for supplying oil to the steam turbine bearing housing, a control oil supply mechanism 2 which is communicated with a current driver of the steam turbine bearing housing and is used for supplying control oil, a transition oil conveying mechanism 3 which is used for collecting oil to be replaced in the control oil supply mechanism 2 and conveying the oil to the lubrication oil supply mechanism 1, an accident oil conveying mechanism 4 which is communicated with the lubrication oil supply mechanism 1 and is used for continuing to supply oil to the steam turbine bearing housing without rapidly interrupting the oil, and an exhaust mechanism 5 which is arranged on the lubrication oil supply mechanism 1 and is used for extracting gas, oil fume and water vapor in the lubrication oil supply mechanism 1. In addition, pumps and valves used in the lubrication oil supply mechanism 1, the control oil supply mechanism 2, the transition oil delivery mechanism 3, the accident oil delivery mechanism 4 and the exhaust mechanism 5 are electrically connected with a control cabinet of the steam turbine unit, so that the control of operators is facilitated.

Specifically, the lubrication oil supply mechanism 1 includes a main oil pump 11, a lubrication oil delivery pipe 12, a main oil tank 13, an lubricator 14, an oil pump group 15, a first oil cooler 16, and a first oil filter group 17. The main oil pump 11 can be a centrifugal pump, the main oil pump 11 is sleeved on a front bearing of the steam turbine and driven by a main shaft of the steam turbine, and when the main shaft of the steam turbine rotates at a high speed, the main oil pump 11 is driven to operate, lubricating oil is diffused from the inside of a front bearing box to the periphery, and then high-pressure oil is generated. In general, the outlet oil pressure of the main oil pump 11 is 1.27 mpa.

Referring to fig. 1, the lubrication oil pipeline 12 may be made of stainless steel pipe, and as the lubrication oil pipeline in the whole lubrication oil supply mechanism 1, for easy understanding of the layout path of the lubrication oil pipeline 12 in the embodiment of the present application, each section of the lubrication oil pipeline 12 is numbered from the first lubrication oil pipe 1200 to the ninth lubrication oil pipe 1208, and the first lubrication oil pipe 1200 to the ninth lubrication oil pipe 1208 may be provided with valves according to the specific oil supply situation.

Specifically, one end of the first lubricating oil pipe 1200 is flanged to the oil inlet end of the main oil pump 11, and the other end of the first lubricating oil pipe 1200 is screwed to the oil outlet end of the lubricator 14, so as to inject the oil in the main oil tank 13 into the main oil pump 11. One end of the second lubrication pipe 1201 is in flange connection with the oil discharging end of the main oil pump 11, and the other end of the second lubrication pipe 1201 is connected with the main oil tank 13 for oil return. And the second lubricating oil pipe 1201 is also connected with a third lubricating oil pipe 1202 through an adapter at a position between the main oil tank 13 and the main oil pump 11, and the oil discharging end of the third lubricating oil pipe 1202 is communicated with a security system or an oil engine of the steam turbine unit for rapidly cutting off the security oil so as to protect the steam turbine. The fourth lubricating oil pipe 1203 is communicated with one end of the oil discharging end of the oil injector 14, and the other end of the fourth lubricating oil pipe 1203 is respectively communicated with the oil inlet end of the oil pump set 15 and the oil inlet end of the first oil cooler 16 through a three-way adapter. The lubricating oil is supplied back to the main oil tank 13 through the fifth lubricating oil pipe 1204 by the oil pump group 15.

One end of the sixth lubricant pipe 1205 is communicated with the oil discharging end of the oil pump set 15, and the other end of the sixth lubricant pipe 1205 is communicated with the second lubricant pipe 1201. One end of the seventh lubricating oil pipe 1206 communicates with the oil discharge end of the first oil cooler 16, and the other end of the seventh lubricating oil pipe 1206 communicates with the oil intake end of the first oil filter group 17. One end of the eighth lubricating oil pipe 1207 is communicated with the oil discharging end of the first oil filter group 17, and the other end of the eighth lubricating oil pipe 1207 is respectively communicated with the oil inlet ends of the bearings of the bearing housing of the steam turbine through branch pipes. One end of the ninth lubricating oil pipe 1208 is communicated with the oil discharging end of each bearing, the other end of the ninth lubricating oil pipe 1208 is in threaded connection with the main oil tank 13, and finally return oil returns to the main oil tank 13 through the ninth lubricating oil pipe 1208.

In a possible embodiment of the present application, an overpressure valve 121 is also mounted on the lubrication line 12 at a position between the first oil filter group 17 and the main tank, i.e. an overpressure valve 121 is mounted on the eighth lubrication line 1207. When the pressure of the lubricating oil is too high, the excessive flow can flow back into the main tank 13 through the overpressure valve 121, protecting the mechanisms in the whole oil supply device from damage due to the too high pressure.

Further, in order to make the lubricating oil to be delivered to each bearing of the bearing housing of the steam turbine purer and to reduce impurities in the lubricating oil, a second oil filter 122 is installed on the lubricating oil delivery pipe 12 at a position near the oil inlet end of the bearing housing of the steam turbine for filtering impurities in the lubricating oil.

The main oil tank 13 can be made of aluminum alloy materials, and the bottom of the main oil tank 13 is of a conical necking structure, so that filter residues in lubricating oil can be conveniently precipitated. The main oil tank 13 is communicated with the lubricating oil delivery pipeline 12 in a threaded connection mode and is used for storing lubricating oil.

In some possible embodiments of the present application, in order to reduce impurities from entering the lubricator 14 from the main tank 13, a filter screen frame 131 may be fixedly mounted on a top plate in the main tank 13 in a bolt connection manner, where the filter screen frame 131 may be a rectangular metal filter screen frame body with an open top end, and the filter screen frame 131 combines with the top plate of the main tank 13 to enclose the lubricator 14, so that impurities entering the lubricator 14 can be reduced.

The number of the oil injectors 14 is two, namely, a low-pressure oil injector 141 and a high-pressure oil injector 142, wherein the oil discharging end of the low-pressure oil injector 141 is communicated with the first lubricating oil pipe 1200, the oil discharging end of the low-pressure oil injector 141 is generally 0.1 megapascal and is used for supplying oil to the main oil pump 11, the oil discharging end of the high-pressure oil injector 142 is communicated with the fourth lubricating oil pipe 1203, the oil discharging end of the high-pressure oil injector 142 is generally 0.22 megapascal and is used for supplying oil to each bearing for lubrication and cooling after sequentially passing through the first oil cooler 16 and the first oil filter group 17 under the action of the high-pressure oil injector 142.

The oil pump group 15 includes a high-pressure oil pump 151 having one end communicating with the lubricator 14 through the lubrication oil delivery pipe 12, an alternating-current lubrication oil pump 152 communicating with the other end of the high-pressure oil pump 151 through the lubrication oil delivery pipe 12, and a direct-current lubrication oil pump 153 mounted on the lubrication oil delivery pipe 12 and connected in parallel with the alternating-current lubrication oil pump 152. Specifically, the two ends of the high-pressure oil pump 151 are respectively communicated with the fifth lubrication oil pipe 1204 and the sixth lubrication oil pipe 1205, the high-pressure oil pump 151 can adopt a high-pressure alternating-current oil pump, and the high-pressure oil pump 151 is mainly used for providing lubricating oil and security oil for the whole steam turbine system, when the steam turbine normally operates, the lubricating oil and the security oil are provided by the main oil pump 11, the high-pressure oil pump 151 is used as an emergency standby pump, when the steam turbine normally rotates to drive the main oil pump 11 to start working, the high-pressure oil pump 151 needs to be deactivated, and the pressure of the oil discharging end of the main oil pump 11 is prevented from being higher than that of the high-pressure oil pump 151, so that the high-pressure oil pump 151 is damaged. The alternating-current lubrication pump 152 may be a low-pressure alternating-current pump, and two ends of the alternating-current lubrication pump 152 may be respectively communicated with the fourth lubrication oil pipe 1203 and the fifth lubrication oil pipe 1204 in a flange connection manner. The two ends of the direct-current lubrication oil pump 153 can also be communicated with the fourth lubrication oil pipe 1203 and the fifth lubrication oil pipe 1204 in a flange connection mode, that is, the direct-current lubrication oil pump 153 is connected in parallel with the alternating-current lubrication oil pump 152.

The ac lubricant pump 152 is used when the steam turbine is turned on, and at the same time, the ac lubricant pump 152 may also serve as an emergency backup pump. When the oil pressure of the lubricating oil is lower than the limit value due to the failure of the steam turbine and the alternating-current lubricating oil pump 152 cannot be put into operation, the direct-current lubricating oil pump 153 is used for providing the lubricating oil pressure for the steam turbine, so that the steam turbine can be safely stopped, and the oil-breaking and tile-grinding accidents are avoided.

The first oil cooler 16 may be a water-cooled oil cooler, and both ends of the first oil cooler 16 are respectively communicated with the fourth lubricating oil pipe 1203 and the seventh lubricating oil pipe 1206. In a possible embodiment of the present application, the number of first oil coolers 16 is two and in parallel relationship with each other as a backup. After the lubricating oil passes through the first oil cooler 16, the oil discharge temperature can be controlled to be about 40 ℃, and the heat productivity of the rotating friction part of the bearing box can be continuously taken away in the process of recycling the lubricating oil.

The first filter group 17 is composed of two filters connected in parallel, one for each, and can be switched immediately when the pressure difference of the filters is high, and the first filter group 17 and the seventh lubricating oil pipe 1206 can be mounted in a flange connection manner. The first oil filter group 17 serves to filter impurities in the lubricating oil on-line, thereby improving the safety of the oil.

The flow of the lubricating oil in the lubrication oil feeding mechanism 1 is as follows, the low-pressure lubricator 141 in the main tank 13 supplies the lubricating oil to the main oil pump 11, and then the main oil pump 11 generates high-pressure oil and feeds the high-pressure oil to the steam turbine as main valve high-pressure oil and mechanical overspeed oil. The lubricating oil then flows back from the third lubricating oil pipe 1202 to the main oil tank 13, some impurities in the lubricating oil are precipitated at the bottom of the main oil tank 13, and some impurities are filtered by the filter screen frame 131, and the filtered lubricating oil is conveyed to the fourth lubricating oil pipe 1203 by the high-pressure lubricator 142, and then conveyed to the turbine and the generator from the eighth lubricating oil pipe 1207 after being conveyed to the first oil filter group 17 on the first oil cooler 16 and the seventh lubricating oil pipe 1206 in sequence, as lubricating oil for bearings. When the steam turbine is just started, since the rotation speed is low, the high-pressure oil pump 151 is required to convey the lubricating oil from the sixth lubricating oil pipe 1205 to the main oil pump 11. When the steam turbine is on-board, the alternating current lubricating oil pump 152 is used as emergency standby. When the whole steam turbine fails, the alternating-current lubricating oil pump 152 is not started in a linkage way because the lubricating oil pressure is low, and the direct-current lubricating oil pump 153 is started at the moment to improve the lubricating oil pressure for the steam turbine, so that the steam turbine can be safely stopped.

Referring to fig. 1, the control oil supply mechanism 2 includes a secondary oil tank 21, a control oil delivery pipe 22 having one end communicating with a control end of a bearing housing of the steam turbine, a control oil pump unit 23 installed in the secondary oil tank 21 and communicating with the control oil delivery pipe 22, a relief valve 24 installed on the control oil delivery pipe 22, a second oil cooler 25 communicating with the relief valve 24 through the control oil delivery pipe 22, an accumulator 26 communicating with the relief valve 24 through the control oil delivery pipe 22, and a second oil filter 27 installed on the control oil delivery pipe 22 between the relief valve 24 and the accumulator 26.

Specifically, the auxiliary oil tank 21 may be a rectangular tank body formed by stamping an aluminum alloy, and is used for storing control oil, and the control oil delivery pipeline 22 is also composed of a plurality of sections of control oil pipes, so that the control oil delivery pipeline 22 is numbered to the sixth control oil pipe 2205 in sequence according to the first control oil pipe 2200 for facilitating understanding of the flow path of the control oil. The number of the first control oil pipes 2200 is two, the oil inlet ends of the two first control oil pipes 2200 are communicated with the oil discharge ends of the corresponding control oil pump group 23 arranged in the auxiliary oil tank 21, and the other ends of the first control oil pipes 2200 are communicated with the oil inlet ends of the overflow valves 24. One end of the second control oil pipe 2201 communicates with the oil discharge end of the relief valve 24 for delivering the oil discharged from the relief valve 24 to the oil inlet end of the control end of the steam turbine bearing housing.

One end of the third control oil pipe 2202 communicates with the second control oil pipe 2201, the other end of the third control oil pipe 2202 communicates with the accumulator 26, and a valve is mounted on the third control oil pipe 2202. Both ends of the fourth control oil pipe 2203 are respectively communicated with the relief valve 24 and the second oil cooler 25. Both ends of the fifth control oil pipe 2204 are respectively communicated with the oil discharge end of the second oil cooler 25 and the oil intake end of the sub-tank 21 for delivering the cooled oil into the sub-tank 21. Both ends of the sixth control oil pipe 2205 are respectively communicated with the control end of the steam turbine and the oil inlet end of the auxiliary oil tank 21 for controlling oil return of the oil.

The control oil pump group 23 is composed of two EH oil pumps, the two EH oil pumps are installed in the auxiliary oil tank 21, the oil supply end is used for supplying oil to the first control oil pipe 2200, and the two EH oil pumps are used for one by one, so that the influence on the normal operation of the steam turbine during the maintenance of the control oil pump group 23 is avoided.

The relief valve 24 is used for unloading the whole control oil supply mechanism 2, when the system pressure increases, the flow of the control oil is reduced, and at the moment, the relief valve 24 is opened, so that the excessive control oil overflows back into the auxiliary oil tank 21, and the inlet pressure of the relief valve 24 is ensured.

The second oil cooler 25 may be a water-cooled oil cooler, a cooling water pipe installed in the second oil cooler 25 is connected with a control valve through threads, control oil enters the second oil cooler 25 from the fourth control oil pipe 2203, heat is taken away by water flowing in the cooling water pipe, and the cooled control oil flows back to the auxiliary oil tank 21 from the fifth control oil pipe 2204.

The accumulator 26 is used as an auxiliary pressure oil source for absorbing and storing the oil in the control oil supply mechanism 2, so that the oil pressure fluctuation in a pipeline is reduced, the impact of equipment operation switching on the control oil supply mechanism 2 is reduced, and accidents such as tripping of a steam turbine unit are avoided. In the embodiment of the present application, the number of the accumulators 26 is set to three, and the oil inlet ends of the three accumulators 26 are respectively connected with the oil discharge ends of the four-way adapter mounted on the third control oil pipe 2202. The second oil filter 27 can be threadably mounted on the second control oil line 2201 for filtering control oil to be delivered to the control end of the steam turbine.

Referring to the figure, two main flow paths of the control oil in the control oil supply mechanism 2 are as follows: first, the oil enters the relief valve 24 from the first control oil pipe 2200 under the pumping action of the control oil pump unit 23, then enters the control end of the turbine bearing machine from the second control oil pipe 2201 after being filtered by the second oil filter 27, and finally flows back to the auxiliary oil tank 21 from the sixth control oil pipe 2205. While a part of the oil in the auxiliary tank 21 is split from the relief valve 24, the split control oil is discharged from the relief valve 24, enters the second oil cooler 25 through the fourth control oil pipe 2203, and returns to the auxiliary tank 21 through the fifth control oil pipe 2204 after being cooled by the second oil cooler 25.

Referring to fig. 1, the transitional oil delivery mechanism 3 can be used to deliver the used control oil in the control oil supply mechanism 2 to the lubrication oil supply mechanism 1, avoiding wasting the control oil. The transitional oil delivery mechanism 3 includes a transitional oil delivery pipe 31 having one end in communication with the auxiliary oil tank 21, a transitional oil tank 32 in communication with the transitional oil delivery pipe 31, and a transitional oil pump group 33 provided in the transitional oil tank 32.

Specifically, the transitional oil delivery pipeline 31 is composed of a first transitional oil pipe 3100 and a second transitional oil pipe 3101, wherein two ends of the first transitional oil pipe 3100 are respectively communicated with the auxiliary oil tank 21 and the transitional oil tank 32, and two ends of the second transitional oil pipe 3101 are respectively communicated with the transitional oil tank 32 and the main oil tank 13. The transitional tank 32 may be a rectangular tank body made of aluminum alloy for temporarily storing the control oil discharged from the auxiliary tank 21. The transitional oil pump group 33 is composed of two transitional oil pumps installed in the transitional oil tank 32, wherein the oil inlet end of one transitional oil pump is communicated with the oil discharge end of the first transitional oil pipe 3100 and is used for pumping control oil in the auxiliary oil tank 21. The discharge end of the other transitional oil pump communicates with the inlet end of the second transitional oil pipe 3101 for pumping the control oil in the transitional oil tank 32 into the main oil tank 13.

Referring to fig. 1 and 2, in a possible embodiment of the present application, a check valve is disposed on a transition oil pipeline 31 between a transition oil tank 32 and a secondary oil tank 21, that is, a check valve may be mounted on a first transition oil pipe 3100 in a threaded connection manner, so that backflow in the transition oil tank 32 into the secondary oil tank 21 can be avoided.

Further, in order to make the lubricant oil quality in the main tank 13 better and the impurities less, in other possible embodiments of the transitional oil delivery mechanism 3, the transitional oil delivery mechanism further comprises an oil discharge pipeline 34 communicated with the transitional oil tank 32, a settling tank 35 communicated with the oil discharge pipeline 34, an oil discharge pipeline 36 with one end communicated with the settling tank 35, and an oil discharge pump 37 mounted on the oil discharge pipeline 34.

Specifically, the oil drain pipeline 34 is composed of a first oil drain pipe 3400 and a second oil drain pipe 3401, the first oil drain pipe 3400 is a two-section parallel pipeline, and two ends of the first oil drain pipe 3400 are respectively communicated with the transition oil tank 32 and the settling tank 35 and are used for conveying oil collected in the transition oil tank 32 into the settling tank 35. Both ends of the second oil drain pipe 3401 are respectively communicated with the settling tank 35 and the main oil tank 13 for delivering the oil after settling filtration into the main oil tank 13 as lubricating oil. The settling tank 35 may be a rectangular tank made of aluminum alloy for stationary settling of oil. The oil discharging pipeline 36 is used for discharging inferior oil or waste oil in the settling tank 35, and of course, a valve should be installed on the oil discharging pipeline 36. The oil discharge pump 37 is mounted on the second oil discharge pipe 3401 of the oil discharge pipe 34.

Further, in order to make the effect of removing impurities in the oil of the settling tank 35 better, a filter plate 38 is further inserted into the settling tank 35, the filter plate 38 divides the area in the settling tank 35 into a settling area 350 and an oil storage area 351, the settling area 350 is used for static settling and impurity removal, the oil storage area 351 is used for supplying oil to the oil discharge pump 37, the filter plate 38 can be a plate body made of non-woven fabrics and a filter screen, and can be installed in the settling tank 35 in a bolt connection mode or a welding mode for filtering impurities in the oil.

Referring to fig. 1, the accident oil delivery mechanism 4 may be composed of an accident oil delivery pipe 41, an accident oil tank 42, an accident oil delivery pump 43, and an accident oil discharge pipe 44, wherein a plurality of valves are installed on the accident oil delivery pipe 41, both ends of the accident oil delivery pipe 41 are respectively communicated with the accident oil tank 42 and the main oil tank 13, the accident oil tank 42 may be a rectangular box body made of an aluminum alloy for temporarily storing lubricating oil, the accident oil delivery pump 43 is installed in the accident oil tank 42, and both ends of the accident oil discharge pipe 44 are respectively communicated with the accident oil delivery pump 43 and the first lubricating oil pipe 1200. When the main oil pump 11 stops running, and the steam turbine is still in the accident state of operation, the accident oil delivery mechanism 4 can carry lubricating oil to the main oil pump 11, does not cause the quick interruption of the oil supply of the lubricating oil, and simultaneously can also give sufficient time for the operators to react, thereby avoiding the accident of damage of the steam turbine.

Referring to fig. 2 and 3, the venting mechanism 5 is mounted on the main tank 13 and serves to pump out gas, oil, smoke and water vapor in the main tank 13. The exhaust mechanism 5 comprises an exhaust pipe 51 and an exhaust fan 52, wherein one end of the exhaust pipe 51 is arranged on the top plate of the main oil tank 13 in a penetrating way, and in order to make the exhaust effect better, the air inlet of the exhaust pipe 51 is in a horn shape with a narrow upper part and a wide lower part. The exhaust end of the exhaust pipe 51 is in flange connection with an exhaust fan 52, and the exhaust fan 52 can be a centrifugal fan.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. A steam turbine bearing housing oil supply apparatus, comprising:

the lubricating oil supply mechanism (1) comprises a main oil pump (11) arranged on a steam turbine bearing, a lubricating oil conveying pipeline (12) with one end communicated with the main oil pump (11), a main oil tank (13) communicated with the lubricating oil conveying pipeline (12), an oil injector (14) arranged in the main oil tank (13) and communicated with the lubricating oil conveying pipeline (12), an oil pump group (15) communicated with the oil injector (14) through the lubricating oil conveying pipeline (12), a first oil cooler (16) communicated with an oil pump group (15) through the lubricating oil conveying pipeline (12) and a first oil filter group (17) communicated with the first oil cooler (16) through the lubricating oil conveying pipeline (12), wherein the first oil filter group (17) is communicated with the main oil pump (11) on the steam turbine bearing through the lubricating oil conveying pipeline (12);

a control oil supply mechanism (2) comprising a secondary oil tank (21), a control oil delivery pipeline (22) with one end communicated with a current driver of a bearing box of the steam turbine, a control oil pump group (23) arranged in the secondary oil tank (21) and communicated with the control oil delivery pipeline (22), an overflow valve (24) arranged on the control oil delivery pipeline (22), a second oil cooler (25) communicated with the overflow valve (24) through the control oil delivery pipeline (22), an energy accumulator (26) communicated with the overflow valve (24) through the control oil delivery pipeline (22) and a second oil filter (27) arranged on the control oil delivery pipeline (22) and positioned between the overflow valve (24) and the energy accumulator (26);

the transition oil conveying mechanism (3) comprises a transition oil conveying pipeline (31) with one end communicated with the auxiliary oil tank (21), a transition oil tank (32) communicated with the transition oil conveying pipeline (31) and a transition oil pump group (33) arranged in the transition oil tank (32), wherein the transition oil pump group (33) is communicated with the main oil tank (13) through the transition oil conveying pipeline (31);

the accident oil delivery mechanism (4) is communicated with the main oil tank (13) and is used for continuously supplying oil to the steam turbine bearing without rapidly interrupting lubricating oil; and

an exhaust mechanism (5) mounted on the main oil tank (13) and used for extracting gas, oil fume and water vapor in the main oil tank (13);

the oil pump group (15) comprises a high-pressure oil pump (151) with one end communicated with the oil injector (14) through a lubricating oil pipeline (12), an alternating-current lubricating oil pump (152) communicated with the other end of the high-pressure oil pump (151) through the lubricating oil pipeline (12), and a direct-current lubricating oil pump (153) which is arranged on the lubricating oil pipeline (12) and is connected with the alternating-current lubricating oil pump (152) in parallel;

the alternating-current lubricating oil pump (152) and the direct-current lubricating oil pump (153) are communicated with the oil injector (14) through a lubricating oil pipeline (12);

the transition oil conveying mechanism (3) further comprises an oil discharge pipeline (34) communicated with the transition oil tank (32), a settling tank (35) communicated with the oil discharge pipeline (34), an oil discharge pipeline (36) with one end communicated with the settling tank (35) and an oil discharge pump (37) arranged on the oil discharge pipeline (34);

the other end of the oil drain pipeline (34) is communicated with the main oil tank (13).

2. A steam turbine bearing housing oil supply apparatus as defined in claim 1, wherein: a filter screen frame (131) for surrounding the oil injector (14) is arranged in the main oil tank (13).

3. A steam turbine bearing housing oil supply apparatus as defined in claim 1, wherein: an overpressure valve (121) is arranged on the lubricating oil pipeline (12) at a position between the first oil filter group (17) and the main oil tank (13).

4. A steam turbine bearing housing oil supply apparatus as defined in claim 1, wherein: and the positions, close to the oil inlet end of the bearing box of the steam turbine, on the lubricating oil conveying pipeline (12) are provided with second oil filters.

5. A steam turbine bearing housing oil supply apparatus as defined in claim 1, wherein: the number of the first oil coolers (16) is two and the first oil coolers are mutually connected in parallel.

6. A steam turbine bearing housing oil supply apparatus as defined in claim 1, wherein: the number of energy storage devices (26) is plural and connected in parallel with each other.

7. A steam turbine bearing housing oil supply apparatus as defined in claim 1, wherein: a check valve (311) is arranged on a transition oil pipeline (31) between the transition oil tank (32) and the auxiliary oil tank (21).

8. A steam turbine bearing housing oil supply apparatus as defined in claim 1, wherein: a filter plate (38) is arranged in the sedimentation tank (35), and the filter plate (38) divides the area in the sedimentation tank (35) into a sedimentation area (350) and an oil storage area (351).