Lubricating oil cooling system for steam turbine bearing

Abstract

The utility model discloses a lubricating oil cooling system for a steam turbine bearing. The lubricating oil cooling system comprises a lubricating oil station, a lubricating oil pump, a lubricating oil cooler, the steam turbine bearing and a high-position oil groove, the lubricating oil station is communicated with the lubricating oil pump, the lubricating oil cooler is communicated with the lubricating oil pump, the outlet end of the lubricating oil cooler is communicated with the oiling header pipe, and the oiling header pipe is respectively communicated with the first oiling branch pipe and the second oiling branch pipe through a three-way pipe joint; the outlet end of the first oiling branch pipe is communicated with an oil inlet pipeline and an emergency oil conveying pipe through a three-way pipe joint, the outlet end of the second oiling branch pipe is connected to the top end of the high-position oil groove, and the inlet end of the emergency oil conveying pipe is connected to the bottom of the high-position oil groove. The oil inlet pipeline is communicated with an oil inlet end pipe of the turbine bearing, and an oil outlet end pipe of the turbine bearing is communicated with the oil discharge branch pipe; an overflow oil pipe communicated with the oil branch pipe is arranged at the high position of the high-position oil groove, the oil discharge branch pipe is communicated with the return header pipe, and the lubricating oil cooling system can effectively achieve the purpose of preventing a turbine bearing from being damaged due to overheating.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling, in particular to a lubricating oil cooling system for a steam turbine bearing. Background Art

[0002] Steam turbine power generation is a large-scale equipment that uses high-pressure, superheated steam to drive the front and rear shafts of the steam turbine to rotate at high speed and cut the magnetic induction coil to generate electricity. Its support bearings and thrust bearings have high speed and high heat generation during operation. In order to ensure the normal operation of the support and thrust bearings, the safe operating temperature of the bearing parts shall not exceed 95°C. Real-time temperature monitoring is required, and lubricating oil is used for lubrication and cooling, otherwise the bearings will be damaged.

[0003] In order to ensure economic benefits during daily power generation, steam turbines need to generate electricity at full load. After oil cooling, the operating temperature of their bearings can reach about 85°C. This will result in a sudden power outage or lubricating oil pump failure. As the lubricating oil stops working, the temperature of the support and thrust bearings will rise rapidly. In severe cases, the bearing may melt and cause serious damage to the equipment. Even if the steam heat source is cut off immediately, the bearings can still rotate for a long time under high-speed rotation due to inertia. During this period, the bearing temperature will continue to rise, causing irreversible damage to the bearings. Utility Model Content

[0004] Technical problem to be solved: In view of the problem of possible oil supply interruption in the operation of turbine bearings in the prior art, the utility model provides a lubricating oil cooling system for turbine bearings. Under normal conditions, the lubricating oil cooling system continuously supplies lubricating oil from a lubricating oil station. When a power outage or lubricating oil pump failure occurs, the lubricating oil in the high-level oil tank will flow through the bearing lubrication chamber under the action of gravity, taking away heat, thereby effectively preventing the turbine bearings from overheating and being damaged.

[0005] Technical solution: The utility model discloses a lubricating oil cooling system for a steam turbine bearing, the lubricating oil cooling system comprising a lubricating oil station, a lubricating oil pump, a lubricating oil cooler, a steam turbine bearing and a high-position oil tank;

[0006] An oiling end pipe is provided at one side of the bottom of the lubricating oil station, the lubricating oil pump is correspondingly connected to the far end of the oiling end pipe, and the inlet end of the lubricating oil cooler is connected to the inlet end of the lubricating oil pump;

[0007] The outlet end of the lubricating oil cooler is connected to the upper oil main pipe, and the tail end of the upper oil main pipe is connected to the first upper oil branch pipe and the second upper oil branch pipe respectively through a three-way pipe joint;

[0008] The outlet end of the first upper oil branch pipe is connected to the oil inlet pipeline and the emergency oil delivery pipe through a three-way pipe joint; the outlet end of the second upper oil branch pipe is connected to the oil inlet at the top of the high-position oil tank, and the inlet end of the emergency oil delivery pipe is connected to the bottom oil outlet of the high-position oil tank;

[0009] The outlet end of the oil inlet pipeline is connected to the second oil inlet end pipe of the turbine bearing, and the second oil outlet end pipe of the turbine bearing is connected to the oil discharge branch pipe; an overflow oil pipe is arranged at a high position of the high-position oil tank, and the oil discharge branch pipe and the overflow oil pipe are connected to the return main pipe through a three-way pipe joint, and the outlet end of the return main pipe is connected to the top of the lubricating oil station.

[0010] Preferably, at least one first maintenance manhole is provided at the top of the lubricating oil station, and a slag discharge pipe is provided at one side of the bottom of the lubricating oil station.

[0011] Preferably, a second inspection manhole is provided at the top of the high-position oil tank.

[0012] Preferably, the lubricating oil cooler comprises a lubricating oil tank body and a first oil inlet end pipe and a first oil outlet end pipe respectively arranged at the upper and lower ends of the lubricating oil tank body; at least one cooling fan is arranged on a large surface of one side of the lubricating oil tank body.

[0013] Preferably, the oil supply end pipe, the first oil supply branch pipe, the second oil supply branch pipe, the oil inlet pipeline, the oil discharge branch pipe, the return main pipe and the emergency oil delivery pipe are all connected to switch valves, and the switch valves are manual valves or electric valves.

[0014] Preferably, a one-way valve is also provided on the emergency oil pipeline.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The lubricating oil cooling system of the utility model is continuously supplied with lubricating oil by the lubricating oil station under normal conditions. When a power outage or lubricating oil pump failure occurs, the lubricating oil in the high-level oil tank will flow through the bearing lubrication chamber under the action of gravity and take away the heat, effectively preventing the turbine bearing from overheating and damage;

[0017] 2. The lubricating oil cooling system is easy to install and can operate automatically in case of emergencies. It responds quickly and does not require manual operation, which reduces the difficulty of operation. It can effectively protect the turbine bearings and extend the service life of the bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the lubricating oil cooling system of the utility model arranged in the height direction;

[0019] Figure 2 for Figure 1 Top view of the lubricating oil cooling system structure;

[0020] Figure 3 for Figure 1 The front view of the lubricating oil cooler structure;

[0021] Figure 4 for Figure 3 Left view of the lubricating oil cooler structure.

[0022] : 100, lubricating oil cooling system; 1, lubricating oil station; 101, first maintenance manhole; 102, slag discharge pipe; 103, oil supply end pipe; 2, lubricating oil pump; 3, switch valve; 4, lubricating oil cooler; 41, lubricating oil tank; 42, cooling fan; 43, first oil inlet end pipe; 44, first oil outlet end pipe; 5, oil supply main pipe; 6, first oil supply branch pipe; 7, oil supply pipeline; 8, turbine bearing; 81, second oil inlet end pipe; 82, second oil outlet end pipe; 9, oil discharge branch pipe; 10, return main pipe; 11, high-level oil tank; 111, second maintenance manhole; 12, second oil supply branch pipe; 13, overflow oil pipe; 14, emergency oil pipeline. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the following will be combined with the attached Figures 1 to 4 The technical scheme of the embodiment of the utility model is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the utility model.

[0024] like Figure 1~2As shown, the utility model is a lubricating oil cooling system for turbine bearings, the lubricating oil cooling system 100 comprises a lubricating oil station 1, a lubricating oil pump 2, a lubricating oil cooler 4, a turbine bearing 8 and a high-position oil tank 11; an oiling end pipe 103 is arranged on one side of the bottom of the lubricating oil station 1, the lubricating oil pump 2 is correspondingly connected to the far end of the oiling end pipe 103, the inlet end of the lubricating oil cooler 4 is connected to the inlet end of the lubricating oil pump 2; the outlet end of the lubricating oil cooler 4 is connected to the oiling main pipe 5, and the tail end of the oiling main pipe 5 is connected to the first oiling branch pipe 6 and the second oiling branch pipe 12 respectively through a three-way pipe joint; the outlet of the first oiling branch pipe 6 The outlet end is connected to the oil inlet pipeline 7 and the emergency oil delivery pipe 14 respectively through a three-way pipe joint; the outlet end of the second upper oil branch pipe 12 is connected to the oil inlet at the top of the high-level oil tank 11, and the inlet end of the emergency oil delivery pipe 14 is connected to the bottom oil outlet of the high-level oil tank 11; the outlet end of the oil inlet pipeline 7 is connected to the second oil inlet end pipe 81 of the turbine bearing 8, and the second oil outlet end pipe 82 of the turbine bearing 8 is connected to the oil discharge branch pipe 9; an overflow oil pipe 13 is provided at a high position of the high-level oil tank 11, and the oil discharge branch pipe 9 and the overflow oil pipe 13 are connected to the return main pipe 10 through a three-way pipe joint, and the outlet end of the return main pipe 10 is connected to the top of the lubricating oil station 1.

[0025] like Figure 1~2 As shown, at least one first maintenance manhole 101 is provided at the top of the lubricating oil station 1, and a slag discharge pipe 102 is provided at one side of the bottom of the lubricating oil station 1. Specifically, two first maintenance manholes 101 are provided at the top of the lubricating oil station 1 along its length direction, and the impurity precipitation in the lubricating oil station 1 is cleaned through the first maintenance manholes 101, and the slag discharge pipe 102 can further discharge the residue.

[0026] like Figure 1~2 As shown, a second inspection manhole 111 is provided at the top of the high-position oil tank 11 , and impurities precipitated in the high-position oil tank 11 are cleaned through the second inspection manhole 111 .

[0027] like Figure 3~4 As shown, the lubricating oil cooler 4 includes a lubricating oil tank 41 and a first oil inlet end pipe 43 and a first oil outlet end pipe 44 respectively arranged at the upper and lower ends of the lubricating oil tank 41; at least one cooling fan 42 is arranged on a large surface of one side of the lubricating oil tank 41. Specifically, three cooling fans 42 are arranged on a large surface of one side of the lubricating oil tank 41, and the cooling speed of the lubricating oil flowing through the lubricating oil tank 41 can be accelerated by the cooling fans 42.

[0028] like Figure 1~2As shown, the oiling end pipe 103, the first oiling branch pipe 6, the second oiling branch pipe 12, the oil inlet pipe 7, the oil discharge branch pipe 9, the return main pipe 10 and the emergency oil delivery pipe 14 are all connected to the switch valve 3, and the switch valve 3 is a manual valve or an electric valve. It should be noted that the type of the switch valve 3 connected to each delivery pipeline of the lubricating oil cooling system 100 is set according to the demand. Under normal conditions, except for important nodes, most of the switch valves are in a normally open state; when the pipeline is blocked, the switch valve connected to the corresponding pipeline can be closed, so as to facilitate the cleaning of the pipeline.

[0029] like Figure 2 As shown, the emergency oil delivery pipe 14 is connected to a switch valve 3 and a one-way valve (not shown in the figure). The switch valve 3 is in a normally open state, and the one-way valve allows the lubricating oil stored in the high-level oil tank 11 to flow into the oil inlet pipe 7 through the one-way valve; a one-way valve can also be connected to the first oil branch pipe 6 to limit the reverse flow of the lubricating oil.

[0030] The working principle or working method of the utility model:

[0031] During normal operation, after the lubricating oil pump 2 is started, the lubricating oil is first cooled by the lubricating oil cooler 4 under pressure, and then divided. One path of the lubricating oil flows through the first oil-up branch pipe 6 and the oil inlet pipe 7 through the lubrication chamber of the turbine bearing 8 to remove heat; the other path slowly fills the high-level oil tank 11 through the second oil-up branch pipe 12. When the high-level oil tank 11 is full of oil, the excess lubricating oil flows out through the overflow oil pipe 13 and flows along the return main pipe 10 to the lubricating oil station 1.

[0032] When a power outage or a lubricating oil pump failure occurs, the oil pressure at the connection between the first oil branch pipe 6 and the oil inlet pipe 7 and the emergency oil delivery pipe 14 drops and gradually stops. At this time, the lubricating oil in the high-level oil tank 11 will flow back into the turbine bearing lubrication chamber through the oil inlet pipe 7 along the emergency oil delivery pipe 14 under the action of gravity to cool down and take away the heat, thereby achieving the purpose of cooling and preventing the bearing from overheating and damage.

[0033] The above are preferred implementations of the present utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model. These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A lubricating oil cooling system for a steam turbine bearing, characterized in that: The lubricating oil cooling system (100) comprises a lubricating oil station (1), a lubricating oil pump (2), a lubricating oil cooler (4), a steam turbine bearing (8) and a high-level oil tank (11); An oiling end pipe (103) is provided on one side of the bottom of the lubricating oil station (1), the lubricating oil pump (2) is correspondingly connected to the far end of the oiling end pipe (103), and the inlet end of the lubricating oil cooler (4) is connected to the inlet end of the lubricating oil pump (2); The outlet end of the lubricating oil cooler (4) is connected to the upper oil main pipe (5), and the tail end of the upper oil main pipe (5) is connected to the first upper oil branch pipe (6) and the second upper oil branch pipe (12) respectively through a three-way pipe joint; The outlet end of the first upper oil branch pipe (6) is connected to the oil inlet pipeline (7) and the emergency oil delivery pipe (14) respectively through a three-way pipe joint; the outlet end of the second upper oil branch pipe (12) is connected to the top oil inlet of the high-position oil tank (11), and the inlet end of the emergency oil delivery pipe (14) is connected to the bottom oil outlet of the high-position oil tank (11); The outlet end of the oil inlet pipeline (7) is connected to the second oil inlet end pipe (81) of the turbine bearing (8), and the second oil outlet end pipe (82) of the turbine bearing (8) is connected to the oil discharge branch pipe (9); an overflow oil pipe (13) is provided at a high position of the high-position oil tank (11); the oil discharge branch pipe (9) and the overflow oil pipe (13) are connected to the return main pipe (10) through a three-way pipe joint, and the outlet end of the return main pipe (10) is connected to the top end of the lubricating oil station (1).

2. The lubricating oil cooling system for steam turbine bearings according to claim 1, characterized in that: At least one first maintenance manhole (101) is provided at the top of the lubricating oil station (1), and a slag discharge pipe (102) is provided at one side of the bottom of the lubricating oil station (1).

3. The lubricating oil cooling system for steam turbine bearings according to claim 2, characterized in that: A second inspection manhole (111) is provided at the top of the high-position oil tank (11).

4. The lubricating oil cooling system for steam turbine bearings according to any one of claims 1 to 3, characterized in that: The lubricating oil cooler (4) comprises a lubricating oil tank (41) and a first oil inlet pipe (43) and a first oil outlet pipe (44) respectively arranged at the upper and lower ends of the lubricating oil tank (41); at least one cooling fan (42) is arranged on a large surface of one side of the lubricating oil tank (41).

5. The lubricating oil cooling system for steam turbine bearings according to claim 4, characterized in that: The oil supply end pipe (103), the first oil supply branch pipe (6), the second oil supply branch pipe (12), the oil inlet pipeline (7), the oil discharge branch pipe (9), the return main pipe (10) and the emergency oil delivery pipe (14) are all connected to the switch valve (3), and the switch valve (3) is a manual valve or an electric valve.

6. The lubricating oil cooling system for steam turbine bearings according to claim 5, characterized in that: The emergency oil delivery pipe (14) is also provided with a one-way valve.

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