JPH10252418A - Flashing method for lubricating oil system in disassembling/inspection of generator plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce flashing time of a lubricating oil system of a turbine body bearing after disassembling and inspection of the turbine body of a generator plant. SOLUTION: Tanks 12, 26, 17, 46 are cleaned and lubricating oil 14 in the tanks is purified during disassembling/inspection of a turbine body. After disassembling and inspection of the turbine body, a pump 16 is driven for flowing the purified lubricating oil 14 inside the mainoil tank 12 to a turbine body bearing lubricating oil system 10. Then, flashing of a turbine body bearing 20 is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for flushing a lubricating oil system in a turbine body bearing during a turbine body disassembly and inspection in a power plant such as a nuclear power plant or a thermal power plant. This is a reduction in the total number of days required.

[0002]

2. Description of the Related Art In nuclear power plants and thermal power plants, periodic inspections of plants are required at regular intervals. One periodic inspection usually takes several tens of days, during which time the plant must be shut down, so it is desired to reduce the number of days required for the periodic inspection. In the periodic inspection, the turbine body is also disassembled and inspected, and after the disassembly and inspection is completed, the lubricating oil is circulated through the lubricating oil system of the turbine main body bearing portion to flush the system.

FIG. 2 shows an example of a conventional lubricating oil system for a bearing portion of a turbine body and a lubricating oil system for a feed water pump (reactor feed water pump) in a nuclear power plant. The turbine main body lubricating oil system 10 supplies the lubricating oil 14 stored in the main oil tank 12 to each bearing 20 of the turbine main body through the pipe 18 by the power of the pump 16, and lubrication discharged from each bearing 20. The oil is supplied to the main oil tank 12 through the pipe 22.
It is configured to return to. Two systems 24 and 25 are provided as the lubricating oil system for the feedwater pump bearing. One of the systems 24 supplies the lubricating oil 14 stored in the RFP-T oil tank (oil tank for feed water pump) 26 to each bearing 40 of the feed water pump through the pipe 30 by the power of the pump 32,
The lubricating oil 14 discharged from each bearing portion 40 is configured to return to the RFP-T oil tank 26 through the pipe 42.

Similarly, another system 25 supplies the lubricating oil 14 stored in an RFP-T oil tank (oil tank for a water supply pump) 27 to each bearing 40 of the water supply pump through a pipe 31 by the power of a pump 33. Then, the lubricating oil 14 discharged from each bearing portion 40 is supplied to the RFP-T oil tank 27 through the pipe 43.
It is configured to return to. The feedwater pump bearing lubricating oil systems 24 and 25 may be provided with sub-tanks 34 and 35 on the way.

The oil storage tank 46 includes the main oil tank 12 and the RF
This is for replenishing the lubricating oil 14 through the lubricating oil replenishment system 51 when the amount of oil in the PT oil tanks 26 and 27 decreases. The lubricating oil 14 stored in the oil storage tank 46 is supplied to the pipes 50 and 54, the valve 56,
7. The oil is supplied to the main oil tank 12 through a valve 58, a pipe 63, and a valve 59. Further, the oil is supplied to the RFP-T oil tank 26 through the pipes 50 and 54, the valve 56, the pipe 61, the valve 60, the pipe 62, and the valve 64. In addition, the oil is supplied to the RFP-T oil tank 27 through the pipes 50 and 54, the valve 56, the pipe 61, the valve 60, the pipe 66, and the valve 68.

A return route from the main oil tank 12 and the RFP-T oil tanks 26 and 27 to the oil storage tank 46 is also provided. That is, the lubricating oil 1 in the main oil tank 12
4 is a pipe 100, a valve 102, pipes 104 and 105
Through to the oil storage tank 46. The lubricating oil 14 in the RFP-T oil tank 26 includes a pipe 106, a valve 108,
The oil is returned to the oil storage tank 46 through the pipes 110, 112, and 105. The lubricating oil 14 in the RFP-T oil tank 27 is
Piping 114, valve 116, piping 111, 112, 10
5 and returned to the oil storage tank 46.

[0007] The bowler 70 cleans the lubricating oil 14 in the main oil tank 12 and the RFP-T oil tanks 26 and 27 during operation of the plant. That is, an oil cleaning filter is accommodated in the bowler 70, and the lubricating oil 14 purified by the filter is supplied to the main oil tank 12 through the pipes 74 and 63 and the valve 59 by the power of the pump 72. The lubricating oil 14 in the main oil tank 12
6 and 78 to be supplied to the bowler 70. The lubricating oil 14 cleaned by the filter in the bowler 70
Is connected to the pipe 74, the valve 80, and the pipe 8 by the power of the pump 72.
2, RFP through valve 84, piping 62, valve 64
-T oil tank 26, pipe 66, valve 6
8 to the RFP-T oil tank 27. RF
The lubricating oil 14 in the PT oil tank 26 is
It is supplied to the bowler 70 through 8,78. RFP-
The lubricating oil 14 in the T oil tank 27 is supplied to the pipes 90, 88, 7
8 to a bowler 70.

FIG. 3 shows the work process and procedure of the disassembly and inspection of the turbine main body at the time of periodic inspection in the power plant equipped with the lubricating oil system of FIG. After the start of the periodic inspection, the turbine body is disassembled and inspected (including maintenance, repair, parts replacement, etc.), and assembled after the inspection is completed. The disassembly, inspection and assembly usually require about 40 days.

While the turbine body is being disassembled, inspected and assembled, the main oil tank 12, the RFP-T oil tank 2
6, 27, the inside of the oil storage tank 46 is cleaned. The cleaning of the inside of the tank is performed, for example, in such a state that the lubricating oil 14 contained in the tanks 12, 26, 27, 46 is transferred to another empty tank at once or alternately, and after the cleaning is completed, the lubricating oil 14 is re-used. Return to the original tank. Cleaning of the tanks usually requires about three days for each of the tanks 12, 26, 27, and 46.

After disassembling, inspecting, assembling and cleaning the tanks 12, 26, 27, 46 of the turbine body, the pump 16 is driven to remove the lubricating oil 14 in the main oil tank 12 from the turbine body bearing part lubricating oil. The oil is flushed through the system 10 by flowing the system 10.

As shown in FIG. 4 (a), a strainer 94 is always in the turbine main body bearing inlet 92 (orifice), and a relatively large amount of dust in the turbine main body bearing lubricating oil system 10 during operation. Is removed here. When the flushing of the turbine body bearing lubricating oil system 10 is performed after the completion of the overhaul and inspection, as shown in FIG.
A mesh 96 of about 140 to 160 mesh is attached to the strainer 94.
Is set in the turbine main body bearing inlet 92, and the pump 16 (FIG. 1) is driven to circulate the lubricating oil 14 through the system 10. As a result, the fine particles in the system 10 are removed and the lubricating oil 14 is cleaned. Flushing usually takes about 12 to 13 days.

[0012]

According to the conventional working process shown in FIG. 3, it takes about 40 days to disassemble, inspect, and assemble the turbine body (the oil tanks 12, 26, 27, and 46 have a different size). The cleaning is performed during that time), and thereafter, the flushing of the turbine main body lubricating oil system 10 is performed for about 12 to 13 days, so that a periodical inspection requires more than 50 days in total.

The present invention solves the above-mentioned problems in the prior art, and provides a method of flushing a lubricating oil system at the time of disassembly and inspection of a power plant in which the time required for flushing after the completion of disassembly and inspection of the turbine body is reduced. What you want to do.

[0014]

According to the first aspect of the present invention,
In a power plant having a turbine main body bearing lubricating oil system in which lubricating oil flows from a main oil tank to a turbine main body bearing and returns to the main oil tank, the turbine main body lubricating oil system is provided separately from the turbine main body bearing lubricating oil system. A main oil tank flushing system for returning the lubricating oil to the main oil tank through an oil cleaning filter is provided. During disassembly and inspection of the turbine main body, cleaning of the main oil tank and subsequent main oil tank flushing system are performed. The flushing of the main oil tank is also performed, and after the disassembly and inspection of the turbine main body is completed and assembled, the lubricating oil in the main oil tank cleaned by the flushing is supplied to the turbine main body bearing lubricating oil system. Through the oil purifying filter that is branched into or part of the turbine main body lubricating oil system. Te is made by flushing the turbine body bearing portion lubricant oil system.

According to a second aspect of the present invention, there is provided a lubricating oil system for a turbine main body bearing portion in which lubricating oil flows from a main oil tank to a turbine main body bearing portion and returns to the main oil tank. In a power plant having a lubricating oil supply system for supplying a lubricating oil to a water supply pump bearing part and a lubricating oil to be supplied from the oil storage tank to the main oil tank and the oil tank for the water supply pump by flowing to the bearing part and returning to the oil tank for the water supply pump. , The turbine body bearing lubricating oil system,
A main oil tank flushing system that returns the lubricating oil in the main oil tank to the main oil tank through an oil cleaning filter, separately from the lubricating oil system for the water supply pump bearing and the lubricating oil supply system; An oil tank flushing system for returning the lubricating oil to the oil tank for the feed pump through an oil cleaning filter; an oil storage tank flushing system for returning the lubricating oil in the oil storage tank to the oil storage tank through the oil cleaning filter; During disassembly and inspection of the main body, cleaning of the main oil tank and subsequent flushing of the main oil tank by the main oil tank flushing system, cleaning of the oil tank for the water supply pump, and subsequent oil for the water supply pump Flushing of the oil tank for the feedwater pump by the tank flushing system, before After cleaning the inside of the oil storage tank and subsequent flushing of the oil storage tank by the oil storage tank flushing system, after disassembling and inspecting the turbine main body and assembling it, the inside of the main oil tank cleaned by the flushing is cleaned. Is passed through the turbine body bearing lubricating oil system, and the turbine body bearing lubricating oil system is flushed through an oil cleaning filter disposed in the turbine body bearing lubricating oil system or a part thereof. It is made.

According to a third aspect of the present invention, the main oil tank flushing system, the oil tank flushing system for the water supply pump, and the oil cleaning filters of the oil storage tank flushing system share the same oil cleaning filter. Things.

According to a fourth aspect of the present invention, the turbine body bearing lubricating oil system has a turbine body bearing inlet portion for detachably housing a strainer on an inlet side of the turbine body bearing portion. When flushing a bearing portion lubricating oil system, a first space communicating with the main oil tank side and a second space communicating with the turbine body bearing side are provided in place of the strainer instead of the strainer. An oil purifying filter that accommodates a filter mounting jig for partitioning into a space and that flushes the turbine body bearing lubricating oil system is disposed outside the turbine body bearing entrance, and the oil cleaning filter is disposed inside the turbine body bearing entrance. The first space and the inlet side of the oil purifying filter, and the second space and the outlet side of the oil purifying filter are connected by hoses or In Connect is made to constitute a path for flushing the turbine body bearing portion lubricant oil system.

According to the first aspect of the present invention, a main oil tank flushing system is provided, the inside of the main oil tank is cleaned during the overhaul of the turbine body, and the main oil tank flushing system is used to lubricate the main oil tank. Since the oil is cleaned, when the turbine main body bearing is flushed after the completion of the disassembly and inspection of the turbine main body, the flushing can be performed using the lubricating oil in the cleaned main oil tank, which is necessary for the flushing. The time can be reduced, and the time required for periodic inspection can be reduced.

According to the second aspect of the present invention, an oil tank flushing system for a feed water pump and an oil storage tank flushing system are further provided so that cleaning and flushing of each tank can be performed during overhaul of the turbine body. Therefore, the time required for the periodic inspection can be shortened.

According to the third aspect of the present invention, since the oil cleaning filter of each oil tank flushing system is shared, the configuration can be simplified.

According to the fourth aspect of the present invention, the space in the turbine main body bearing inlet portion for detachably housing the strainer is used, and this space is replaced with the first space on the main oil tank side instead of the strainer. A filter mounting jig for partitioning is accommodated in a second space on the turbine body bearing side, and an oil cleaning filter provided outside and the first and second spaces are connected to each other by a hose or a pipe to form a turbine body bearing portion. Since the path for flushing the lubricating oil system has been configured, the lubricating oil system of the turbine main body can be flushed using a large-capacity oil cleaning filter. Can be further reduced.

[0022]

Embodiments of the present invention will be described below. FIG. 5 shows an example of a lubricating oil system of a turbine main body bearing portion and a feedwater pump (reactor feedwater pump) bearing portion to which the method of the present invention is applied.

The bearing body lubricating oil system 10 supplies the lubricating oil 14 stored in the main oil tank 12 to each bearing part 20 of the turbine body through a pipe 18 by the power of a pump 16, and discharges it from each bearing part 20. The lubricating oil is returned to the main oil tank 12 through the pipe 22. Two systems 24 and 25 are provided as the lubricating oil system for the feedwater pump bearing. One of the systems 24 is a lubricating oil 14 stored in an RFP-T oil tank (oil tank for feed water pump) 26.
Is supplied to each bearing portion 40 of the water supply pump through the pipe 30 by the power of the pump 32, and the lubricating oil 14 discharged from each bearing portion 40 is returned to the RFP-T oil tank 26 through the pipe 42.

Similarly, the other one system 25 supplies the lubricating oil 14 stored in the RFP-T oil tank (oil tank for the water supply pump) 27 to each bearing 40 of the water supply pump through the pipe 31 by the power of the pump 33. Then, the lubricating oil 14 discharged from each bearing portion 40 is supplied to the RFP-T oil tank 27 through the pipe 43.
It is configured to return to. The feedwater pump bearing lubricating oil systems 24 and 25 may be provided with sub-tanks 34 and 35 on the way.

The oil storage tank 46 includes the main oil tank 12 and the RF
This is for replenishing the lubricating oil 14 through the lubricating oil replenishment system 51 when the amount of oil in the PT oil tanks 26 and 27 decreases. The lubricating oil 14 stored in the oil storage tank 46 is supplied to the pipes 50 and 54, the valve 56,
7. The oil is supplied to the main oil tank 12 through a valve 58, a pipe 63, and a valve 59. Further, the oil is supplied to the RFP-T oil tank 26 through the pipes 50 and 54, the valve 56, the pipe 61, the valve 60, the pipe 62, and the valve 64. In addition, the oil is supplied to the RFP-T oil tank 27 through the pipes 50 and 54, the valve 56, the pipe 61, the valve 60, the pipe 66, and the valve 68.

A return route from the main oil tank 12 and the RFP-T oil tanks 26 and 27 to the oil storage tank 46 is also provided. That is, the lubricating oil 1 in the main oil tank 12
4 is a pipe 100, a valve 102, pipes 104 and 105
Through to the oil storage tank 46. The lubricating oil 14 in the RFP-T oil tank 26 includes a pipe 106, a valve 108,
The oil is returned to the oil storage tank 46 through the pipes 110, 112, and 105. The lubricating oil 14 in the RFP-T oil tank 27 is
Piping 114, valve 116, piping 111, 112, 10
5 and returned to the oil storage tank 46.

The bowler 70 cleans the lubricating oil 14 in the main oil tank 12 and the RFP-T oil tanks 26 and 27 during operation of the plant. That is, an oil cleaning filter is accommodated in the bowler 70, and the lubricating oil 14 purified by the filter is supplied to the main oil tank 12 through the pipes 74 and 63 and the valve 59 by the power of the pump 72. The lubricating oil 14 in the main oil tank 12
6 and 78 to be supplied to the bowler 70. The lubricating oil 14 cleaned by the filter in the bowler 70
Is connected to the pipe 74, the valve 80, and the pipe 8 by the power of the pump 72.
2, RFP through valve 84, piping 62, valve 64
-T oil tank 26, pipe 66, valve 6
8 to the RFP-T oil tank 27. RF
The lubricating oil 14 in the PT oil tank 26 is
It is supplied to the bowler 70 through 8,78. RFP-
The lubricating oil 14 in the T oil tank 27 is supplied to the pipes 90, 88, 7
8 to a bowler 70.

The configuration up to the point described above is the same as that of FIG.

The capacity of the oil cleaning filter in the bowler 70 is generally small, and it is impossible to flush the tanks 12, 26, 27 and 46 in a short time after cleaning.
Therefore, the pipe 120 bypassing the valve 56 is connected to the pipe 5
4 and an oil purification filter housing 122 that accommodates a relatively large-capacity oil purification filter is provided in the pipe 120. Oil cleaning filter housing 122
Before and after, valves 124 and 126 are provided. In the oil cleaning filter housing 122, for example, a ZetaPlus (registered trademark) filter manufactured by CUNO is housed as a cartridge type oil cleaning filter. As a result, dust and impurities in the lubricating oil 14 can be removed by the mechanical filtration and the adsorption action by the zeta potential.

A pipe 128 is connected between the pipe 57 and the oil storage tank 46. A valve 130 is provided in the middle of the pipe 128. The pipe 50 and the pipe 105 are connected by a pipe 132. A valve 134 is provided in the middle of the pipe 132.

With the above configuration, a main oil tank flushing system 140, a feed pump oil tank flushing system 142, and an oil storage tank flushing system 144 are configured. Switching of each of the flushing systems 140, 142, 144 is realized by switching valves. That is, when configuring the main oil tank flushing system 140, the valves 102, 134, 124, 126, 58, 59 are turned on and the others are turned off. Then, the lubricating oil 14 in the main oil tank 12 is supplied to the pipe 100 and the valve 10 by the power of the pump 52.
2, piping 104, 105, piping 132, valve 134,
The main oil tank 12 passes through the pump 52, the pipe 120, the valve 124, the oil cleaning filter housing 122, the valve 126, the pipe 57, the valve 58, the pipe 63, and the valve 59.
The oil is cleaned in the oil cleaning filter housing 122 by circulating through a route returning to.

Oil tank flushing system 1 for feed water pump
42, the valves 124, 126, 60,
64, 68, 108, 116 and 134 are turned on, and the others are turned off. Then, the lubricating oil 14 in the PFP-T oil tank 26 (27) is supplied to the pipe 106 (11
4), valve 108 (116), piping 110 (11)
1), 112, 105, 132, valve 134, pump 52, pipe 120, valve 124, oil cleaning filter housing 122, valve 126, pipe 57, 61, valve 60, pipe 62 (66), through valve 64 (68). The oil is circulated through a route returning to the PFP-T oil tank 26 (27) to perform oil cleaning in the oil cleaning filter housing 122.

When configuring the oil storage tank flushing system 144, the valves 124, 126 and 130 are turned on,
Turn off others. Then, with the power of the pump 52, the lubricating oil 14 in the oil storage tank 46 is supplied to the pipe 50, the pump 52, the pipe 120, the valve 124, the flushing filter 122, the valve 126, the pipes 57 and 128, and the valve 13.
Circulating through 0 to return to oil storage tank 46,
Oil cleaning is performed in the oil cleaning filter housing 122. The flushing systems 140, 142, 144
Can be operated individually one system at a time, or multiple systems can be operated simultaneously.

When the flushing of the turbine main body bearing 20 is performed after the completion of the disassembly and inspection of the turbine main body, the strainer 9 used during operation is inserted into the turbine main body bearing entrance 92.
If the oil cleaning device 150 as shown in FIG. 6A is set instead of the oil purifier 4 (FIG. 4A), the flushing of the turbine main body bearing portion 20 can be performed more efficiently. This oil cleaning device 150 includes a filter mounting jig 1 accommodated in a turbine main body bearing inlet 92 instead of the strainer 94.
52. The filter mounting jig 152 is made of iron or the like, and includes a semi-cylindrical partition plate 160 and disk-shaped plates 156 and 158 for closing both ends thereof, as shown in FIG. 6B. . Filter mounting jig 1
The first and second spaces 52 form first and second spaces 162 and 164 in the inlet portion 92 while being housed in the turbine body bearing inlet portion 92. The outer shape of the plate 156 is formed to be substantially the same as the inner diameter of the turbine main body bearing inlet portion 92. A hole 168 is formed in the plate 156 at a position facing the second space 164. A packing 169 is attached to an end surface of the plate 156 at a position surrounding the hole 168. The plate 158 includes the plate 15
Hole 1 through which bolts for fixing 8 to flange 180 are inserted
74 are formed. The plate 158 has holes 17 at positions facing the first and second spaces 162 and 164.
0,172 are formed. Filter mounting jig 15
2 is a pipe connecting the first space 162 to the pipe 1 from the main oil tank 12.
76, with the hole 170 facing the pipe 178 to the turbine main body bearing portion 20 and the turbine main body bearing inlet 9
2 and fixed by bolting the plate 158 to the flange 180. In this state, the packing 169
Is strongly pressed against the inner space end face 171 of the turbine main body bearing inlet 92, and the lubricating oil 14 flowing from the pipe 176 is prevented from running over the peripheral edge of the plate 156 and flowing directly to the pipe 178.

The outer surface of the plate 158 has holes 17
Hose connection ports 182 and 184 are attached to communicate with 0,172. Valves 186 and 188 are provided at the hose connection ports 182 and 184. Hose connection port 1
82,184 have flexible hoses 190,19.
2 are connected respectively. Between both ends of the hoses 190 and 192, the pipe 194 to which the pipe 194 is connected is branched in the middle into two pipes, and each of the branch pipes 194-1 and 194 is connected.
-2, oil cleaning filter housings 196 and 198 are provided. Oil cleaning filter housing 196,1
The cartridge 98 contains, for example, a Zeta Plus filter manufactured by Cuno Inc. as a cartridge type oil cleaning filter.

Oil cleaning filter housings 196, 19
Before and after 8, valves 200, 202, 204, 206
Are arranged. A valve 207 is provided downstream of the position where the branch pipes 194-1 and 194-2 merge.
In each of the branch pipes 194-1 and 194-2, differential pressure gauges 212 and 214 for measuring a differential pressure between input and output of the oil cleaning filter housings 196 and 198 are provided. These differential pressure gauges 212 and 214 are for detecting a clogged state of the filter during flushing. The pipe 194 is provided with a sample outlet 208 for checking the cleanliness of the oil during flushing. The sample outlet 208 is provided with a valve 210.

The valves 186, 188, 200, 202,
By driving the pump 16 (FIG. 5) with the valves 204 and 206 opened and the valve 210 closed, the main oil tank 1
2 from the pipe 176, the first space 162, the hose 190, the pipes 194-1 and 194-2, and the hose 19
2, circulates through a path returning to the main oil tank 12 via the second space 164, the pipe 178, and the turbine main body bearing 20, and dust and impurities are removed by oil cleaning filter housings 196 and 198 on the way, and the turbine main body bearing is removed. Flushing of the partial lubricating oil system 10 is performed. During the flushing, the valve 210 is opened and a sample is taken out to detect the degree of cleaning of the lubricating oil. Further, during flushing, the clogging state of the oil cleaning filter can be known by the differential pressure gauges 212 and 214 (the larger the clogging amount, the larger the differential pressure). If the differential pressure becomes larger than a predetermined value, , Replace the oil cleaning filter. When replacing the oil cleaning filter, replace the valve 200,
Close 202 (or 204, 206) and open the oil cleaning filter housing 196 (198) to replace the oil cleaning filter cartridge with a new one. By replacing the oil cleaning filter housings 196 and 198 one by one, the filter can be replaced without stopping the flushing operation.

FIG. 1 shows work steps and procedures of a turbine body disassembly and inspection work at the time of a periodic inspection in a power plant equipped with the lubricating oil system of FIG. After the start of the periodic inspection, the turbine body is disassembled and inspected (including maintenance, repair, parts replacement, etc.), and assembled after the inspection is completed. The disassembly, inspection and assembly usually require about 40 days.

While disassembling, inspecting and assembling the turbine body, the main oil tank 12, the RFP-T oil tank 2
6, 27, the inside of the oil storage tank 46 is cleaned. The inside of the tank is cleaned, for example, by transferring the lubricating oil 14 contained in the tanks 12, 26, 27, 46 to another empty tank at once or alternately. Return to the original tank again. To clean the tank,
Each of the tanks 12, 26, 27, and 46 usually requires about three days.

After cleaning the tanks 12, 26, 27, and 46, the pumps 52 power the tanks 12, 26, 2 and 2, respectively.
The lubricating oil in 7, 46 is supplied to the main oil tank flushing system 14
0, the oil is circulated through the oil pump flushing system 142 for the water supply pump and the oil storage tank flushing system 144, and the oil is cleaned by the oil cleaning filter housing 122. This flushing operation can be performed sequentially from the tank system where cleaning has been completed, or can be performed after cleaning of all tanks 12, 26, 27 and 46 is completed. Further, the flushing operation is performed one system at a time, or two systems are simultaneously operated (for example, the systems 140 and 142 are simultaneously operated).
Alternatively, the systems 142 and 144 are simultaneously operated or the system 1
40, 144 simultaneously) or all systems 14
0, 142 and 144 can be performed simultaneously. By this flushing, the lubricating oil 14 in each of the tanks 12, 26, 27, and 46 is cleaned by the time the turbine body is disassembled, inspected, and assembled.

The flushing of each system 140, 142, 144 is terminated almost at the same time as or before or after disassembly, inspection, and assembly of the turbine body are completed.
After the assembly is completed, the pump 16 is driven to flow the lubricating oil 14 of the main oil tank 12 to the turbine main body lubricating oil system 10 to flush the system 10.
This flushing is performed by using the lubricating oil 14 in the cleaned main oil tank 12 and by using the oil cleaning device 150 having a large filter capacity shown in FIG. 6, so that the flushing can be completed in a short time. , About three days. Therefore, the entire process can be significantly reduced as compared with the conventional method of FIG. Note that the flushing of the tank flushing systems 140, 142, and 144 can be continued during the flushing of the turbine main body lubricating oil system 10.

FIG. 7 shows another example of the structure of the filter mounting jig accommodated in the turbine main body bearing inlet portion 92. 7A illustrates a state in which the filter mounting jig 216 is housed in the turbine main body bearing inlet 92, and FIG. 7B illustrates the filter mounting jig 216 alone. Filter mounting jig 2
In 16, a disk-shaped plate 218 is attached to the flange 180 of the turbine main body bearing entrance portion 92 by bolting.
Pipes 220 and 222 are fixed to the plate 218. The end 220 a of the pipe 220 is the hole 2 of the plate 218.
26. The pipe 222 penetrates the plate 218 and is housed in the turbine main body bearing inlet 92.

A disk-shaped plate 224 is fixed to the end 222 a of the pipe 222. The outer diameter of the plate 224 is formed to be substantially the same as the inner diameter of the turbine main body bearing inlet portion 92. The end 222a of the pipe 222 is a plate 22
4 communicates with a hole 228 at the center. Plate 224
The packing 230 is attached to the end face of the wrapping member 228 so as to surround the hole 228. When the plate 218 is fixed to the flange 180 by bolting, the packing 230 is strongly pressed against the end face 232 of the internal space of the turbine main body bearing entrance portion 92. Outer ends 220b, 2 of pipes 220, 222
The filter unit 234 is connected to 22b. The filter unit 234 is configured, for example, as shown in the right part of FIG.

According to the above configuration, the space inside the turbine main body bearing inlet 92 is partitioned by the wall surface of the pipe 222,
A first space 236 communicating with the main oil tank 12 is formed outside the pipe 222, and a second space 238 communicating with the turbine main body bearing 20 is formed inside the pipe 222.
The flushing system is composed of the main oil tank 12 → pipe 176 → first space 236 → pipe 220 → filter section 234 → pipe 222 (second space 238) → pipe 178 → turbine main body bearing section 20 → main oil tank 12. Is done.

FIG. 8 shows another example of the structure of the filter mounting jig accommodated in the turbine main body bearing inlet 92. 8A shows a state in which the filter mounting jig 240 is housed in the turbine main body bearing entrance 92, and FIG. 8B shows the filter mounting jig 240 alone. Filter mounting jig 2
At 40, a disk-shaped plate 242 is attached to the flange 180 of the turbine main body bearing entrance portion 92 by bolting.
The plate 242 is fixedly provided with an end 244 a of a pipe 244 having substantially the same inner diameter as the turbine main body bearing inlet 92. The end 244 a of the pipe 244 communicates with the hole 246 of the plate 242. The pipe 244 is bent at a right angle by an elbow 248 and narrowed to a small diameter at the small diameter portion 250. In the pipe 244, a pipe 252 having a smaller diameter than the pipe 244 penetrates the elbow 248 of the pipe 244 and is fixedly disposed coaxially with the pipe 244. The pipe 252 is housed in the turbine main body bearing entrance 92.

A disk-shaped plate 254 is fixed to the end 252a of the pipe 252. End 25 of pipe 252
2a communicates with a hole 256 at the center of the plate 254. A packing 258 is attached to an end surface of the plate 254 so as to surround the hole 256. When the plate 242 is fixed to the flange 180 by bolting, the packing 2
58 is the end face 2 of the internal space of the turbine main body bearing entrance 92;
32 is pressed strongly. A filter section 260 is connected to outer ends 244b and 252b of the pipes 244 and 252. The filter unit 260 is configured, for example, as shown in the right part of FIG.

According to the above configuration, the space inside the turbine main body bearing inlet 92 is partitioned by the wall surface of the pipe 252,
A first space 262 communicating with the main oil tank is formed outside the pipe 252, and a second space 264 communicating with the turbine main body bearing 20 is formed inside the pipe 252. The flushing system includes a main oil tank 12 → a pipe 176 → a first space 262 → a pipe 244 → a filter section 260 → a pipe 252.
(Second space 264) → pipe 178 → turbine main body bearing part 20 → main oil tank 12.

8, the outer pipe 244 is formed in a straight line, and the inner pipe 252 is bent in the middle.
It is also possible to have a structure that penetrates the wall surface of the outer pipe 244 and pulls it out.

[0049]

As described above, according to the first aspect of the present invention, the main oil tank flushing system is provided, the main oil tank is cleaned during the overhaul of the turbine body, and the main oil tank flushing system is used. When cleaning the turbine body bearing after the turbine body has been disassembled and inspected,
Flushing can be performed using the purified lubricating oil in the main oil tank, the time required for flushing can be reduced, and the time required for periodic inspection can be reduced.

According to the second aspect of the present invention, an oil tank flushing system for a feed water pump and an oil storage tank flushing system are further provided so that cleaning and flushing of each tank are performed during overhaul and inspection of the turbine body. Therefore, the time required for the periodic inspection can be shortened.

According to the third aspect of the invention, since the oil cleaning filter of each oil tank flushing system is shared, the configuration can be simplified.

According to the fourth aspect of the present invention, the space in the turbine main body bearing inlet portion for detachably housing the strainer is used, and this space is replaced with the first space on the main oil tank side instead of the strainer. A filter mounting jig for partitioning is accommodated in a second space on the turbine body bearing side, and an oil cleaning filter provided outside and the first and second spaces are connected to each other by a hose or a pipe to form a turbine body bearing portion. Since the path for flushing the lubricating oil system has been configured, the lubricating oil system of the turbine main body can be flushed using a large-capacity oil cleaning filter. Can be further reduced.

[Brief description of the drawings]

FIG. 1 is a work process diagram showing an embodiment of the present invention;
FIG. 6 is a diagram showing work steps and procedures for disassembling and inspecting a turbine main body at the time of periodic inspection in a power plant including the lubricating oil system of FIG. 5.

FIG. 2 is a diagram showing an example of a conventional lubricating oil system of a turbine main body bearing and a lubricating oil system of a feedwater pump bearing in a nuclear power plant.

3 is a work process for disassembling and inspecting a turbine body during a periodic inspection in a power plant including the lubricating oil system of FIG. 2;
It is a figure showing a procedure.

FIG. 4 is a diagram showing a detailed configuration of a turbine main body bearing inlet portion 92 of FIG. 2;

FIG. 5 is a diagram showing an example of a lubricating oil system of a turbine main body bearing and a lubricating oil system of a feed water pump bearing in a nuclear power plant to which the method of the present invention is applied.

6 is a diagram showing an example of an oil cleaning device used for flushing of the turbine main body lubricating oil system 10 of FIG.

FIG. 7 is a diagram showing another configuration example of the filter mounting jig.

FIG. 8 is a view showing still another configuration example of the filter mounting jig.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 Turbine body bearing lubricating oil system 12 Main oil tank 14 Lubricating oil 20 Turbine body bearing part 24 Feed water pump bearing lubricating oil system 26, 27 RFP-T oil tank (oil tank for feed water pump) 40 Feed water pump bearing part 46 Oil storage Tank 51 Lubricating oil supply system 92 Turbine main body bearing inlet 94 Strainer 122 Oil cleaning filter housing (oil cleaning filter for flushing systems 140, 142, 144) 140 Main oil tank flushing system 142 Oil tank flushing system for feed water pump 144 Oil storage tank Flushing system 152, 216, 240 Filter mounting jig 162 First space 164 Second space 190, 192 Hose 194 Piping 196, 198 Oil cleaning filter housing (oil cleaning filter for turbine body bearing lubricating oil system) Over)

Claims (4)

[Claims] 1. A power plant having a turbine body bearing lubricating oil system for flowing lubricating oil from a main oil tank to a turbine body bearing and returning the lubricating oil to the main oil tank. A main oil tank flushing system for returning the lubricating oil in the main oil tank to the main oil tank through an oil cleaning filter is provided, and during disassembly and inspection of the turbine body, cleaning of the main oil tank and subsequent main cleaning are performed. After the flushing of the main oil tank by the oil tank flushing system is performed, and after the disassembly and inspection of the turbine body is completed and assembled,
The lubricating oil in the main oil tank, which has been cleaned by the flushing, flows into the turbine main body bearing lubricating oil system, and is divided into the turbine main body bearing lubricating oil system or a part of the oil cleaning system. A method for flushing a lubricating oil system during a disassembly and inspection of a power generation plant formed by flushing the lubricating oil system of the turbine main body through a filter. 2. A lubricating oil system for a turbine main body bearing portion, in which lubricating oil flows from a main oil tank to a turbine main body bearing portion and returns to the main oil tank, and lubricating oil flows from a feed water pump oil tank to a water feed pump bearing portion. A power supply plant having a lubricating oil system for returning a lubricating oil to a feed water pump oil tank and a lubricating oil replenishing system for supplying lubricating oil from an oil storage tank to the main oil tank and the oil pump tank; A main oil tank flushing system that returns the lubricating oil in the main oil tank to the main oil tank through an oil cleaning filter, separately from the lubricating oil system, the water supply pump bearing lubricating oil system, and the lubricating oil supply system, the water supply pump Oil tank flushing system for returning the lubricating oil in the oil tank to the oil tank for the water pump through an oil purifying filter. Providing an oil storage tank flushing system for returning the lubricating oil in the oil storage tank to the oil storage tank through an oil cleaning filter; disassembling and inspecting the turbine body, cleaning the main oil tank and subsequently flushing the main oil tank; Flushing of the main oil tank by a system, cleaning of the oil tank for the feed pump and subsequent flushing of the oil tank for the feed pump by the flushing system of the oil tank for the feed pump, cleaning of the oil storage tank and subsequent storage of the oil After the flushing of the oil storage tank by the tank flushing system is also performed, after the disassembly and inspection of the turbine body is completed and assembled,
The lubricating oil in the main oil tank, which has been cleaned by the flushing, flows into the turbine main body bearing lubricating oil system, and is divided into the turbine main body bearing lubricating oil system or a part of the oil cleaning system. A method for flushing a lubricating oil system during a disassembly and inspection of a power generation plant formed by flushing the lubricating oil system of the turbine main body through a filter. 3. The power generator according to claim 2, wherein the oil cleaning filters of the main oil tank flushing system, the oil tank flushing system for the feed water pump, and the oil storage tank flushing system share the same oil cleaning filter. Flushing method for lubricating oil system when disassembling and inspecting the plant. 4. The turbine body bearing lubricating oil system has a turbine body bearing inlet section for removably accommodating a strainer on an inlet side of the turbine body bearing section. At the time of flushing, in place of the strainer, a filter mounting for partitioning a space in the turbine main body bearing inlet into a first space communicating with the main oil tank side and a second space communicating with the turbine main body bearing side. A jig is accommodated, and an oil cleaning filter for flushing the turbine main body bearing portion lubricating oil system is arranged outside the turbine main body bearing entrance portion,
The first space in the turbine main body bearing inlet portion and the inlet side of the oil clean filter and the second space and the outlet side of the oil clean filter are connected by a hose or a pipe, respectively, and the turbine main body bearing portion is connected. The method for flushing a lubricating oil system during disassembly and inspection of a power plant according to any one of claims 1 to 3, wherein a path for flushing the lubricating oil system is configured.