Lubricating oil purification system for thermal power generation

Abstract

The utility model discloses a thermal power generation lubricating oil purification system, belongs to the technical field of thermal power generation, and aims to solve the problem that a great deal of lubricating oil is discharged and wasted by the thermal power generation lubricating oil purification system. Comprising a main engine oil tank and a purifying device, the main engine oil tank is connected with the purifying device through a first filtering oil outlet pipe and a first filtering oil return pipe, a clean oil storage tank is connected with the main engine oil tank through an oil supplementing front-section pipe, a first oil pump and an oil supplementing rear-section pipe, and the main engine oil tank is connected with a dirty oil storage tank through a dirty oil front-section pipe, the first oil pump and a dirty oil rear-section pipe. The dirty oil storage tank is connected with the clean oil storage tank through a second filtering oil outlet pipe, a purifying device and a second filtering oil return pipe. During maintenance, lubricating oil in the main engine oil tank is pumped into the dirty oil storage tank, the purifying device purifies the lubricating oil in the dirty oil storage tank and then pumps the purified lubricating oil into the purified oil storage tank, and clean lubricating oil in the purified oil storage tank can be pumped back into the main engine oil tank after maintenance is completed, so that the lubricating oil does not need to be discharged during maintenance, and waste is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal power generation, in particular to a thermal power generation lubricating oil purification system. Background Art

[0002] Thermal power generation is a method of generating electricity by using the heat energy generated by the combustion of combustibles and converting it into electrical energy through power devices such as steam turbines. When the generator set is running, it is necessary to continuously lubricate long-term rotating parts such as turbine rotor bearings to ensure the safe and stable operation of the generator set.

[0003] The quality of lubricating oil affects the rotation state of the turbine rotor. Therefore, thermal power generating units are generally equipped with lubricating oil purification systems to filter and purify the lubricating oil. During the inspection, minor repair and overhaul of the lubricating oil purification system of the generating unit, the lubricating oil in the main engine lubricating oil tank is generally poured into the dirty oil tank, resulting in a large amount of lubricating oil discharge and waste. Utility Model Content

[0004] The purpose of the utility model is to provide a thermal power generation lubricating oil purification system to solve the problem that a large amount of lubricating oil is discharged and wasted during the maintenance of the lubricating oil purification system of the thermal power generator set. The technical solution adopted by the utility model is as follows:

[0005] A thermal power generation lubricating oil purification system comprises a main engine oil tank, a purification device, a clean oil storage tank and a dirty oil storage tank, wherein the purification device is a purification device with a built-in oil delivery pump, a coarse filter, a fine filter and an oil-water separator;

[0006] The filtered oil outlet of the main engine oil tank is connected to the oil inlet of the purification device through the first filtered oil outlet pipe, and the oil outlet of the purification device is connected to the filtered oil inlet of the main engine oil tank through the first filtered oil return pipe. Valves are provided on the first filtered oil outlet pipe and the first filtered oil return pipe.

[0007] The oil outlet of the clean oil storage tank is connected to the inlet end of the first oil pump through the oil replenishment front section pipe, the outlet end of the first oil pump is connected to the oil replenishment port of the main engine oil tank through the oil replenishment rear section pipe, the maintenance oil discharge port of the main engine oil tank is connected to the inlet end of the first oil pump through the dirty oil front section pipe, the outlet end of the first oil pump is connected to the oil inlet of the dirty oil storage tank through the dirty oil rear section pipe, the oil outlet of the dirty oil storage tank is connected to the oil inlet of the purification device through the second filter oil outlet pipe, the oil outlet of the purification device is connected to the oil inlet of the clean oil storage tank through the second filter oil return pipe, and valves are provided on the oil replenishment front section pipe, the oil replenishment rear section pipe, the dirty oil front section pipe, the dirty oil rear section pipe, the second filter oil outlet pipe and the second filter oil return pipe.

[0008] Furthermore, it also includes a discharge mother pipe, one end of which is sealed and the other end is connected to the accident oil pool, the accident vent of the main engine oil tank is connected to the discharge mother pipe through the first discharge branch pipe, and an oil replenishing manhole is provided on the clean oil storage tank.

[0009] Furthermore, it also includes a main engine lubricating oil sampling tube, a first valve group is provided on the first discharge branch pipe, the first valve group is composed of two ball valves, one end of the main engine lubricating oil sampling tube is connected to the first discharge branch pipe located between the two ball valves of the first valve group, and a valve is provided on the main engine lubricating oil sampling tube.

[0010] Furthermore, the clean oil storage tank is connected to the discharge main pipeline through a second discharge branch pipe, a second valve group is provided on the second discharge branch pipe, the second valve group is composed of two ball valves, one end of the clean lubricating oil sampling tube is connected to the second discharge branch pipe located between the two ball valves of the second valve group, and a valve is provided on the clean lubricating oil sampling tube.

[0011] Furthermore, the dirty oil storage tank is connected to the discharge main pipeline through a third discharge branch pipe, and a third valve group is provided on the third discharge branch pipe, and the third valve group is composed of two ball valves. One end of the dirty lubricating oil sampling tube is connected to the third discharge branch pipe located between the two ball valves of the third valve group, and a valve is provided on the dirty lubricating oil sampling tube.

[0012] Furthermore, the second filter oil return pipe is connected to the oil inlet of the dirty oil storage tank through an oil unloading pipe, and a valve is provided on the oil unloading pipe.

[0013] Furthermore, the oil outlet of the purification device is connected to the filtered oil return port of the first water pump oil tank through the third filtered oil return pipe, the oil outlet of the purification device is connected to the filtered oil return port of the second water pump oil tank through the fourth filtered oil return pipe, the filtered oil outlet of the first water pump oil tank is connected to the middle of the water pump filter mother pipe through the third filtered oil outlet pipe, the filtered oil outlet of the second water pump oil tank is connected to one end of the water pump filter mother pipe through the fourth filtered oil outlet pipe, and the other end of the water pump filter mother pipe is connected to The oil inlet of the purification device is connected, valves are provided on the third filter oil return pipe, the fourth filter oil return pipe, the third filter oil outlet pipe and the fourth filter oil outlet pipe, the maintenance oil drain port of the first water supply pump oil tank is connected to the middle part of the water supply pump dirty oil main pipe through the first dirty oil branch pipe, the maintenance oil drain port of the second water supply pump oil tank is connected to one end of the water supply pump dirty oil main pipe through the second dirty oil branch pipe, the other end of the water supply pump dirty oil main pipe is connected to the oil inlet of the dirty oil storage tank, and a second oil pump is provided on the water supply pump dirty oil main pipe.

[0014] Furthermore, the third filter oil return pipe is connected to the oil replenishment rear section pipe through the first straight return pipe, and the fourth filter oil return pipe is connected to the oil replenishment rear section pipe through the second straight return pipe.

[0015] Furthermore, the first dirty oil branch pipe and the second dirty oil branch pipe are both connected to the discharge main pipeline through the fourth discharge branch pipe.

[0016] Furthermore, a fourth valve group is provided on the fourth discharge branch pipe, and the fourth valve group is composed of two ball valves. One end of the water pump lubricating oil sampling tube is connected to the fourth discharge branch pipe located between the two ball valves of the fourth valve group, and a valve is provided on the water pump lubricating oil sampling tube.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The main engine oil tank, the first filter oil outlet pipe, the purification device and the first filter oil return pipe constitute the main engine lubricating oil filtering system, the clean oil storage tank, the front section of the oil replenishing pipe, the first oil pump, the rear section of the oil replenishing pipe and the main engine oil tank constitute the main engine lubricating oil replenishing system, the main engine oil tank, the front section of the dirty oil pipe, the first oil pump, the rear section of the dirty oil pipe and the dirty oil storage tank constitute the main engine lubricating oil inspection and drainage system, the dirty oil storage tank, the second filter oil outlet pipe, the purification device, the second filter oil return pipe and the clean oil storage tank constitute the dirty oil purification system, and the first oil pump is used to add the clean lubricating oil in the clean oil storage tank to the main engine oil tank, or to pump the lubricating oil in the main engine oil tank into the dirty oil storage tank during maintenance. The utility model uses a purification device with an oil transfer pump to purify the lubricating oil in the main engine oil tank for lubricating the turbine rotor bearing. When the generator set is running, only the main engine lubricating oil filtering system can form a circulation path, and the valves of other subsystems are closed. The purification device pumps the filtered and purified lubricating oil back to the main engine oil tank. When the generator set needs to be overhauled, close the valve of the main engine lubricating oil filtration system, open the valves of the dirty oil purification system and the main engine lubricating oil overhaul and drain system, and pump the lubricating oil in the main engine oil tank into the dirty oil storage tank through the first oil pump. The purification device can also be used to purify the lubricating oil in the dirty oil storage tank, and pump the purified lubricating oil into the clean oil storage tank. The clean lubricating oil in the clean oil storage tank can be pumped back into the main engine oil tank through the main engine lubricating oil replenishing system after the overhaul is completed, so that the lubricating oil does not need to be discharged during the overhaul, avoiding the waste of lubricating oil. Through the setting of pipelines and valves, the lubricating oil purification system has multiple practical functions to meet the requirements of long-term operation and overhaul. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] In the figure, 1. main engine oil tank, 2. first filter oil outlet pipe, 3. purification device, 4. first filter oil return pipe, 5. clean oil storage tank, 6. front section pipe for oil replenishment, 7. first oil pump, 8. rear section pipe for oil replenishment, 9. front section pipe for dirty oil, 10. rear section pipe for dirty oil, 11. dirty oil storage tank, 12. second filter oil outlet pipe, 13. second filter oil return pipe, 14. discharge main pipeline, 15. accident oil pool, 16. first discharge branch pipe, 17. main engine lubricating oil sampling pipe, 18. second discharge branch pipe, 19. clean lubricating oil sampling pipe, 20. third discharge branch pipe Pipe, 21. Dirty lubricating oil sampling pipe, 22. Third filter oil return pipe, 23. First water pump oil tank, 24. Fourth filter oil return pipe, 25. Second water pump oil tank, 26. First straight return pipe, 27. Third filter oil outlet pipe, 28. First dirty oil branch pipe, 29. Second straight return pipe, 30. Fourth filter oil outlet pipe, 31. Second dirty oil branch pipe, 32. Water pump dirty oil main pipe, 33. Fourth discharge branch pipe, 34. Water pump lubricating oil sampling pipe, 35. Oil unloading pipe, 36. Oil replenishment manhole, 37. Water pump filter main pipe, 38. Second oil pump. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is described below by specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0022] The connection mentioned in the present utility model is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection, including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but is not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: choose welding connection for fixed connection and bolt connection for detachable connection.

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0024] Example: Figure 1As shown, a thermal power generation lubricating oil purification system includes a main engine oil tank 1, a purification device 3, a clean oil storage tank 5 and a dirty oil storage tank 11. The main engine oil tank 1 is provided with a lubricating oil inlet, a lubricating oil outlet, a filter oil inlet and a filter oil outlet. The lubricating oil inlet and the lubricating oil outlet are respectively connected to the lubrication cavity of the turbine rotor bearing seat through pipelines. The purification device 3 is a purification device with a built-in oil pump, a coarse filter, a fine filter and an oil-water separator. In this embodiment, the FCS-YD-01 purification device 3 produced by Yangzhong Xielong Electronic Equipment Co., Ltd. is selected;

[0025] The filtered oil outlet of the main engine oil tank 1 is connected to the oil inlet of the purifier 3 through the first filtered oil outlet pipe 2, and the oil outlet of the purifier 3 is connected to the filtered oil inlet of the main engine oil tank 1 through the first filtered oil return pipe 4. The main engine oil tank 1, the first filtered oil outlet pipe 2, the purifier 3 and the first filtered oil return pipe 4 constitute the main engine lubricating oil filtration system, and valves are provided on the first filtered oil outlet pipe 2 and the first filtered oil return pipe 4;

[0026] The oil outlet of the clean oil storage tank 5 is connected to the inlet end of the first oil pump 7 through the oil replenishment front section pipe 6, and the outlet end of the first oil pump 7 is connected to the oil replenishment port of the main engine oil tank 1 through the oil replenishment rear section pipe 8. The clean oil storage tank 5, the oil replenishment front section pipe 6, the first oil pump 7, the oil replenishment rear section pipe 8 and the main engine oil tank 1 constitute the main engine lubricating oil replenishment system, the maintenance oil drain port of the main engine oil tank 1 is connected to the inlet end of the first oil pump 7 through the dirty oil front section pipe 9, and the outlet end of the first oil pump 7 is connected to the oil inlet of the dirty oil storage tank 11 through the dirty oil rear section pipe 10. The main engine oil tank 1, the dirty oil front section pipe 9, the first oil pump 7, the dirty oil rear section pipe 10 and the dirty oil storage tank 11 constitute the main engine lubricating oil maintenance oil drain system. The oil outlet is connected to the oil inlet of the purifier 3 through the second filter oil outlet pipe 12, the oil outlet of the purifier 3 is connected to the oil inlet of the clean oil storage tank 5 through the second filter oil return pipe 13, the dirty oil storage tank 11, the second filter oil outlet pipe 12, the purifier 3, the second filter oil return pipe 13 and the clean oil storage tank 5 constitute a dirty oil purification system, the first oil pump 7 is used to add the clean lubricating oil in the clean oil storage tank 5 to the main engine oil tank 1, or to pump the lubricating oil in the main engine oil tank 1 into the dirty oil storage tank 11 during maintenance, and valves are provided on the oil replenishment front section pipe 6, the oil replenishment rear section pipe 8, the dirty oil front section pipe 9, the dirty oil rear section pipe 10, the second filter oil outlet pipe 12 and the second filter oil return pipe 13.

[0027] The utility model uses a purification device 3 with an oil pump to purify the lubricating oil in the main engine oil tank 1 for lubricating the turbine rotor bearing. When the generator set is running, only the main engine lubricating oil filtering system can form a circulation path, and the valves of other subsystems are closed. The purification device 3 pumps the filtered and purified lubricating oil back into the main engine oil tank 1. When the generator set needs to be overhauled, the valve of the main engine lubricating oil filtering system is closed, and the valves of the dirty oil purification system and the main engine lubricating oil overhaul and oil discharge system are opened. The lubricating oil in the main engine oil tank 1 is pumped into the dirty oil storage tank 11 through the first oil pump 7. The purification device 3 can also be used to purify the lubricating oil in the dirty oil storage tank 11, and the purified lubricating oil is pumped into the clean oil storage tank 5. The clean lubricating oil in the clean oil storage tank 5 can be pumped back into the main engine oil tank 1 through the main engine lubricating oil replenishing system after the overhaul is completed, so that the lubricating oil does not need to be discharged during the overhaul, thereby avoiding the waste of lubricating oil. Through the arrangement of pipelines and valves, the lubricating oil purification system has multiple practical functions to meet the requirements of long-term operation and overhaul.

[0028] It also includes a discharge mother pipe 14, one end of which is sealed and the other end is connected to the accident oil pool 15. The accident venting port of the main engine oil tank 1 is connected to the discharge mother pipe 14 through the first discharge branch pipe 16, and the clean oil storage tank 5 is provided with an oil replenishment manhole 36. When an accident such as a fire occurs, if there is lubricating oil in the main engine oil tank 1, it will help combustion and bring greater harm to the thermal power plant. Therefore, when an accident occurs, the lubricating oil in the main engine oil tank 1 is discharged to the accident oil pool 15 through the discharge mother pipe 14, which can alleviate or extinguish the fire in time. The oil replenishment manhole 36 is used to replenish the lubricating oil to the system again after the lubricating oil in the main engine oil tank 1 is discharged through the discharge mother pipe 14.

[0029] The main engine lubricating oil sampling tube 17 is also included. A first valve group is provided on the first discharge branch pipe 16. The first valve group is composed of two ball valves. One end of the main engine lubricating oil sampling tube 17 is connected to the first discharge branch pipe 16 located between the two ball valves of the first valve group. A valve is provided on the main engine lubricating oil sampling tube 17. The main engine lubricating oil sampling tube 17 is used to sample the lubricating oil in the main engine oil tank 1 to obtain the quality of the lubricating oil in the main engine oil tank 1.

[0030] The clean oil storage tank 5 is connected to the discharge main pipeline 14 through the second discharge branch pipe 18, and a second valve group is provided on the second discharge branch pipe 18, and the second valve group is composed of two ball valves. One end of the clean lubricating oil sampling tube 19 is connected to the second discharge branch pipe 18 located between the two ball valves of the second valve group, and a valve is provided on the clean lubricating oil sampling tube 19. The second discharge branch pipe 18 is used to discharge the lubricating oil retained in the clean oil storage tank 5, and the clean lubricating oil sampling tube 19 is used to sample the lubricating oil in the clean oil storage tank 5.

[0031] The dirty oil storage tank 11 is connected to the discharge main pipeline 14 through the third discharge branch pipe 20. The third discharge branch pipe 20 is provided with a third valve group, which is composed of two ball valves. One end of the dirty lubricating oil sampling tube 21 is connected to the third discharge branch pipe 20 located between the two ball valves of the third valve group. A valve is provided on the dirty lubricating oil sampling tube 21. The third discharge branch pipe 20 is used to discharge the lubricating oil retained in the dirty oil storage tank 11, and the dirty lubricating oil sampling tube 21 is used to sample the lubricating oil in the dirty oil storage tank 11.

[0032] The second filter oil return pipe 13 is connected to the oil inlet of the dirty oil storage tank 11 through the oil discharge pipe 35, and a valve is provided on the oil discharge pipe 35. The oil discharge pipe 35 is used to discharge the lubricating oil in the purifier 3 into the dirty oil storage tank when repairing the purifier 3 or replacing the filter element of the purifier 3. The valve on the oil discharge pipe 35 is normally closed. When it is necessary to discharge the lubricating oil in the purifier 3, the valve on the second filter oil return pipe 13 is closed, and the valve on the oil discharge pipe 35 is opened.

[0033] The oil outlet of the purifier 3 is connected to the filter oil return port of the first water pump oil tank 23 through the third filter oil return pipe 22, the oil outlet of the purifier 3 is connected to the filter oil return port of the second water pump oil tank 25 through the fourth filter oil return pipe 24, the filter oil outlet of the first water pump oil tank 23 is connected to the middle of the water pump filter mother pipe 37 through the third filter oil outlet pipe 27, the filter oil outlet of the second water pump oil tank 25 is connected to one end of the water pump filter mother pipe 37 through the fourth filter oil outlet pipe 30, and the other end of the water pump filter mother pipe 37 is connected to the purifier 3 The oil inlet of the water pump oil tank 23 is connected, valves are provided on the third filter oil return pipe 22, the fourth filter oil return pipe 24, the third filter oil outlet pipe 27 and the fourth filter oil outlet pipe 30, the maintenance oil drain port of the first water pump oil tank 23 is connected to the middle part of the water pump dirty oil main pipe 32 through the first dirty oil branch pipe 28, the maintenance oil drain port of the second water pump oil tank 25 is connected to one end of the water pump dirty oil main pipe 32 through the second dirty oil branch pipe 31, the other end of the water pump dirty oil main pipe 32 is connected to the oil inlet of the dirty oil storage tank 11, and a second oil pump 38 is provided on the water pump dirty oil main pipe 32. The utility model can also be used for filtering and purifying the lubricating oil of a feedwater pump turbine. The first feedwater pump oil tank 23 and the second feedwater pump oil tank 25 provide lubricating oil for the two feedwater pump turbines respectively. The purification device 3 pumps the filtered and purified lubricating oil back to the first feedwater pump oil tank 23 through the third filter return oil pipe 22 and pumps it back to the second feedwater pump oil tank 25 through the fourth filter return oil pipe 24. The lubricating oil in the first feedwater pump oil tank 23 and the second feedwater pump oil tank 25 can enter the purification device 3 through the feedwater pump filter mother pipe 37, forming a lubricating oil purification circulation system for the feedwater pump turbine.

[0034] The third filter oil return pipe 22 is connected to the oil replenishment rear section pipe 8 through the first straight return pipe 26, and the fourth filter oil return pipe 24 is connected to the oil replenishment rear section pipe 8 through the second straight return pipe 29. When the first water supply pump oil tank 23 and the second water supply pump oil tank 25 do not need to add lubricating oil, the lubricating oil can also be directly returned to the main engine oil tank 1 through the oil replenishment rear section pipe 8.

[0035] The first dirty oil branch pipe 28 and the second dirty oil branch pipe 31 are both connected to the discharge main pipeline 14 through the fourth discharge branch pipe 33. The fourth discharge branch pipe 33 is used to discharge the lubricating oil in the first feed water pump oil tank 23 and the second feed water pump oil tank 25.

[0036] A fourth valve group is provided on the fourth discharge branch pipe 33, and the fourth valve group is composed of two ball valves. One end of a water pump lubricating oil sampling tube 34 is connected to the fourth discharge branch pipe 33 located between the two ball valves of the fourth valve group, and a valve is provided on the water pump lubricating oil sampling tube 34. The water pump lubricating oil sampling tube 34 is used to sample the lubricating oil in the first water pump oil tank 23 and the second water pump oil tank 25.

[0037] The above embodiments are merely illustrative of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A thermal power generation lubricating oil purification system, characterized in that: The invention comprises a main engine oil tank (1), a purification device (3), a clean oil storage tank (5) and a dirty oil storage tank (11); the purification device (3) is a purification device with a built-in oil delivery pump, a coarse filter, a fine filter and an oil-water separator; The filtered oil outlet of the main engine oil tank (1) is connected to the oil inlet of the purification device (3) through a first filtered oil outlet pipe (2), and the oil outlet of the purification device (3) is connected to the filtered oil inlet of the main engine oil tank (1) through a first filtered oil return pipe (4), and valves are provided on the first filtered oil outlet pipe (2) and the first filtered oil return pipe (4); The oil outlet of the clean oil storage tank (5) is connected to the inlet end of the first oil pump (7) through the oil replenishment front section pipe (6), the outlet end of the first oil pump (7) is connected to the oil replenishment port of the main engine oil tank (1) through the oil replenishment rear section pipe (8), the maintenance oil discharge port of the main engine oil tank (1) is connected to the inlet end of the first oil pump (7) through the dirty oil front section pipe (9), and the outlet end of the first oil pump (7) is connected to the oil inlet of the dirty oil storage tank (11) through the dirty oil rear section pipe (10). The oil outlet of the dirty oil storage tank (11) is connected to the oil inlet of the purification device (3) through a second filtered oil outlet pipe (12), and the oil outlet of the purification device (3) is connected to the oil inlet of the clean oil storage tank (5) through a second filtered oil return pipe (13). Valves are provided on the oil replenishment front section pipe (6), the oil replenishment rear section pipe (8), the dirty oil front section pipe (9), the dirty oil rear section pipe (10), the second filtered oil outlet pipe (12) and the second filtered oil return pipe (13).

2. A thermal power generation lubricating oil purification system according to claim 1, characterized in that: It also includes a discharge main pipeline (14), one end of which is sealed and the other end is connected to the accident oil pool (15), the accident venting port of the main engine oil tank (1) is connected to the discharge main pipeline (14) through a first discharge branch pipe (16), and an oil replenishing manhole (36) is provided on the clean oil storage tank (5).

3. A thermal power generation lubricating oil purification system according to claim 2, characterized in that: The invention also comprises a main engine lubricating oil sampling tube (17), a first valve group is arranged on the first discharge branch tube (16), the first valve group is composed of two ball valves, one end of the main engine lubricating oil sampling tube (17) is connected to the first discharge branch tube (16) located between the two ball valves of the first valve group, and a valve is arranged on the main engine lubricating oil sampling tube (17).

4. A thermal power generation lubricating oil purification system according to claim 2, characterized in that: The clean oil storage tank (5) is connected to the discharge main pipeline (14) through a second discharge branch pipe (18), and a second valve group is provided on the second discharge branch pipe (18). The second valve group is composed of two ball valves. One end of the clean lubricating oil sampling pipe (19) is connected to the second discharge branch pipe (18) located between the two ball valves of the second valve group, and a valve is provided on the clean lubricating oil sampling pipe (19).

5. A thermal power generation lubricating oil purification system according to claim 2, characterized in that: The dirty oil storage tank (11) is connected to the discharge main pipeline (14) through a third discharge branch pipe (20), and a third valve group is provided on the third discharge branch pipe (20), and the third valve group is composed of two ball valves. One end of the dirty lubricating oil sampling pipe (21) is connected to the third discharge branch pipe (20) located between the two ball valves of the third valve group, and a valve is provided on the dirty lubricating oil sampling pipe (21).

6. A thermal power generation lubricating oil purification system according to claim 1, characterized in that: The second filter oil return pipe (13) is connected to the oil inlet of the dirty oil storage tank (11) through an oil unloading pipe (35), and a valve is provided on the oil unloading pipe (35).

7. A thermal power generation lubricating oil purification system according to any one of claims 2 to 6, characterized in that: The oil outlet of the purifying device (3) is connected to the oil outlet of the first water supply pump oil tank (23) through the third oil outlet pipe (22), the oil outlet of the purifying device (3) is connected to the oil outlet of the second water supply pump oil tank (25) through the fourth oil outlet pipe (24), the oil outlet of the first water supply pump oil tank (23) is connected to the middle of the water supply pump filter mother pipe (37) through the third oil outlet pipe (27), the oil outlet of the second water supply pump oil tank (25) is connected to one end of the water supply pump filter mother pipe (37) through the fourth oil outlet pipe (30), and the other end of the water supply pump filter mother pipe (37) is connected to the purifying device (3). The oil inlet of the water pump is connected, the third filter oil return pipe (22), the fourth filter oil return pipe (24), the third filter oil outlet pipe (27) and the fourth filter oil outlet pipe (30) are all provided with valves, the maintenance oil outlet of the first water pump oil tank (23) is connected to the middle part of the water pump dirty oil main pipe (32) through the first dirty oil branch pipe (28), the maintenance oil outlet of the second water pump oil tank (25) is connected to one end of the water pump dirty oil main pipe (32) through the second dirty oil branch pipe (31), the other end of the water pump dirty oil main pipe (32) is connected to the oil inlet of the dirty oil storage tank (11), and a second oil pump (38) is provided on the water pump dirty oil main pipe (32).

8. A thermal power generation lubricating oil purification system according to claim 7, characterized in that: The third filter oil return pipe (22) is connected to the oil replenishment rear section pipe (8) through the first straight return pipe (26), and the fourth filter oil return pipe (24) is connected to the oil replenishment rear section pipe (8) through the second straight return pipe (29).

9. A thermal power generation lubricating oil purification system according to claim 7, characterized in that: The first dirty oil branch pipe (28) and the second dirty oil branch pipe (31) are both connected to the discharge main pipe (14) through the fourth discharge branch pipe (33).

10. A thermal power generation lubricating oil purification system according to claim 7, characterized in that: A fourth valve group is provided on the fourth discharge branch pipe (33), and the fourth valve group is composed of two ball valves. One end of the water pump lubricating oil sampling tube (34) is connected to the fourth discharge branch pipe (33) located between the two ball valves of the fourth valve group, and a valve is provided on the water pump lubricating oil sampling tube (34).

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