CN111271139B - Method for flushing pipeline of turbine lubricating oil system - Google Patents
Method for flushing pipeline of turbine lubricating oil system Download PDFInfo
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- CN111271139B CN111271139B CN202010210584.0A CN202010210584A CN111271139B CN 111271139 B CN111271139 B CN 111271139B CN 202010210584 A CN202010210584 A CN 202010210584A CN 111271139 B CN111271139 B CN 111271139B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/002—Cleaning of turbomachines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
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Abstract
The invention relates to the technical field of lubricating oil flushing, in particular to a method for flushing a pipeline of a turbine lubricating oil system, which comprises the following steps of 1, manually cleaning the interiors of a main oil tank, a clean oil tank and a dirty oil tank by cleaning substances; step 2, injecting temporary washing oil into a clean oil tank or a dirty oil tank which is cleaned up; step 3, circularly flushing temporary flushing oil among the main oil tank, the clean oil tank, the dirty oil tank and the connecting pipeline through the oil supply pump and the oil transfer pump until the total amount of impurities collected by an oil return filter screen is not more than 1.0g after the flushing time is 8 hours, and completely discharging the temporary flushing oil to an outdoor oil storage device; step 4, manually cleaning the interiors of the main oil tank, the clean oil tank and the dirty oil tank by cleaning substances; and 5, confirming that the necessary temporary measures are installed. The method for washing the pipeline of the turbine lubricating oil system can greatly improve the cleanliness of the pipeline of the turbine auxiliary lubricating oil system, and provides guarantee for safe, stable and reliable operation of the turbine and the auxiliary system thereof.
Description
Technical Field
The invention relates to the technical field of lubricating oil flushing, in particular to a method for flushing a pipeline of a turbine lubricating oil system.
Background
The lubricating oil system of the steam turbine generator unit is an important auxiliary system of the steam turbine generator unit, and has the main functions of providing lubricating oil for a support bearing, a thrust bearing and a turning gear of the steam turbine generator unit, providing low-pressure safety oil for a steam turbine and providing a standby oil source for a sealing oil system of a generator so as to ensure the requirements of the unit under a normal operation state and an accident state. The pipeline flushing of the lubricating oil system is to adopt a safe and reliable method to remove all external impurities which may enter the oil system, and avoid the impurities from damaging the turbine bearing.
The existence of impurity among the lubricating oil system can cause the friction between each part along with the increase of steam turbine operating time, still can lose lubricating oil in a large number simultaneously, weakens the flexibility ability of each part of steam turbine for the steam turbine can not normally operate, destroys the stability between the operation part, and operating time is of a specified duration moreover, still can make steam turbine work load overweight, and then damages the steam turbine. Moreover, due to the rapid erosion of impurities and high oil pressure, the cover function of the turbine cannot be fully exerted, resulting in excessive swing of oil pressure. In addition, in the speed regulating system of the steam turbine, because the operating pulses are different in change and have a small range, the excessive swing of the speed regulating system can be influenced by the excessive swing of the oil pressure, and even the speed regulating system generates load. In addition, in the process of the operation of the steam turbine, the change of the oil pressure is closely related to each speed regulating system, so impurities in the lubricating oil system can also influence other speed regulating systems, the speed regulating systems are jammed, the steam turbine is out of control seriously, and safety accidents are caused.
For providing safe and reliable lubricating and cooling oil for a turbine bearing, a turbine lubricating oil system is usually designed finely, equipment is multiple, and pipeline arrangement is complex, so that the lubricating oil system is difficult to wash, and a large amount of time and labor are consumed.
Practice shows that the higher the cleanliness of the turbine lubricating oil, the safer and more reliable the operation of the turbine and its accessory systems. The inspection and acceptance of domestic turbine lubricating oil flushing are generally judged according to a NAS sampling analysis method, and the inspection and acceptance standard is generally between NAS grade 7 and NAS grade 9. NAS standard grade comparison see fig. 1.
In conclusion, in order to improve the lubricating oil flushing effect and the cleanliness of the turbine lubricating oil, the operation safety, the stability and the economy of the turbine are improved; meanwhile, the manpower and time consumed by the washing work inside the bearing box of the steam turbine are reduced, the working efficiency is improved, and an effective method for washing a lubricating oil system of the steam turbine needs to be developed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an efficient and reliable method for flushing a turbine lubricating oil system pipeline.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for flushing the pipeline of lubricating oil system of steam turbine includes
and step 13, circularly flushing temporary used oil among the main oil tank, the bearing tank and the oil supply pipeline by the alternating-current lubricating oil pump and/or the direct-current lubricating oil pump until the acceptance standard is met, and stopping flushing in the third stage.
Preferably, in the step 5, the temporary measures specifically include
Removing a pore plate and a filter screen arranged on the oil supply pipeline;
disconnecting the connection part of an oil supply pipeline and each bearing in the bearing box, removing a filter screen before the oil supply pipeline enters each bearing box, connecting a temporary hose to the upper part of an end cover of the filter screen, arranging a lubricating oil distribution device at the downstream of the temporary hose, wherein the distribution device is provided with four pipelines and valves, the downstream of each valve is connected with the temporary hose, and the temporary hoses are respectively led into the bearing box through a manhole on the bearing box;
and disconnecting the pipeline of the relevant instrument of the steam turbine.
Preferably, the step 7, the step 9 or the step 13 further comprises heating and cooling the temporary oil/main oil for rinsing, specifically, heating and cooling the temporary oil/main oil for rinsing
Heating the oil for flushing the temporary oil/regular lubricating oil to 40-70 ℃ by an electric heater in a main oil tank and keeping the temperature for 3 hours;
and (3) reducing the temperature of the oil for washing the temporary oil/main lubricating oil to 20-25 ℃ within 1 hour through an oil cooler, and keeping the temperature for 3 hours.
Preferably, the step 7 or the step 9 or the step 13 further comprises
Knocking the oil supply pipeline for 30 minutes by a knocking tool before the temperature rise operation is carried out;
and knocking the oil supply pipeline for 30 minutes by a knocking tool after the temperature reduction operation is carried out.
Preferably, the step 7, the step 9 or the step 13 further comprises the step of locally washing the bearing in the bearing box through a temporary hose and a lubricating oil distribution device.
Preferably, the cycle of the temperature raising and reducing operation is 14 to 16 hours.
Preferably, in step 7, the step of modifying the temporary measure specifically includes
And (4) bringing the relevant instrument pipeline of the steam turbine into a flushing range.
Preferably, the acceptance criteria specifically include
Flushing at a first stage, wherein the total amount of impurities collected by an oil return filter screen is not more than 1.0g, the maximum hard particulate matter and the maximum soft particulate matter are not more than 0.12 mm, and the maximum fibrous impurities are not more than 0.16 mm when the flushing time is 8 hours;
washing in the second stage, wherein the total amount of impurities collected by an oil return filter screen is not more than 0.5g, the maximum hard particulate matter and the maximum soft particulate matter are not more than 0.12 mm, and the maximum fibrous impurities are not more than 0.16 mm after the washing time is 24 hours;
and in the third stage of washing, the total amount of impurities collected by an oil return filter screen is not more than 0.5g after the washing time is 24 hours, the maximum hard particles and the maximum soft particles are not more than 0.12 mm, and the maximum fibrous impurities are not more than 0.16 mm.
Preferably, the striking tool comprises a mallet or a rubber mallet.
Preferably, the cleaning substance comprises a dough or a mastic.
Advantageous effects
The method for flushing the pipeline of the turbine lubricating oil system can greatly improve the cleanliness of the pipeline of the turbine auxiliary lubricating oil system, and provides guarantee for safe, stable and reliable operation of the turbine and the auxiliary system thereof; the abrasion of the steam turbine and accessory lubricating oil system equipment and pipelines thereof caused by impurities in the lubricating oil can be reduced, and the service lives of the steam turbine and the lubricating oil system equipment are prolonged; the impurities such as hard particles in the lubricating oil can be obviously reduced, the fault of the steam turbine caused by poor lubricating oil quality is reduced, and the economical efficiency of the steam turbine and the auxiliary systems thereof and even the whole power station is further improved; by stage flushing, the turbine and the auxiliary lubricating oil system equipment pipelines can be flushed before the pipelines are completely flushed, so that the lubricating oil flushing work is intervened in advance, and the lubricating oil flushing, the subsequent important node work and the completion time of the whole project construction are greatly advanced.
Drawings
FIG. 1 is a NAS standard grade comparison table;
FIG. 2 is a schematic oil supply diagram of a turbine lubrication oil system according to the present application;
FIG. 3 is a schematic view of the arrangement of the oil tanks of the lubricating oil system of the present application;
FIG. 4 is a schematic view of the connection of temporary piping used in the present application to flush the interior of a bearing housing.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 2 and 3, the turbine lubricating oil system of the present application may include a main oil tank 1, an ac lubricating oil pump 2 and a dc lubricating oil pump 3 arranged in parallel, a filter 4 and a straight-through valve arranged in parallel, two oil coolers 5 arranged in parallel, a bearing box 11, a low pressure cylinder 7, a high pressure cylinder 9, a clean oil tank, a dirty oil tank, an oil transfer pump, an oil supply pump, and a waste oil discharge tank.
The main oil tank 1 is provided with an oil return filter screen, the inlet and outlet ends of an alternating-current lubricating oil pump 2 and a direct-current lubricating oil pump 3 which are arranged in parallel are connected with the main oil tank 1 through an oil supply pipeline, the inlet and outlet ends of a filter 4 and a direct-through valve which are arranged in parallel are connected with the inlet and outlet ends of the alternating-current lubricating oil pump 2 and the direct-current lubricating oil pump 3 which are arranged in parallel through an oil supply pipeline, the inlet and outlet ends of two oil coolers 5 which are arranged in parallel are connected with the inlet and outlet ends of the filter 4 and the direct-through valve which are arranged in parallel through an oil supply pipeline, a turbine radial bearing 8 and/or a thrust bearing 10 are arranged in the bearing box 11, the bearing box 11 is connected with the other inlet and outlet ends of the two oil coolers 5 which are arranged in parallel through an oil supply pipeline, a low pressure cylinder 7 and a high pressure cylinder 9 are connected with two adjacent bearing boxes 11, a clean oil tank and a dirty oil tank, and a fuel pump are used for conveying oil in the main oil tank 1 to the clean oil tank or the dirty oil tank through a connecting pipeline, the oil feed pump is used for conveying oil in the clean oil tank or the dirty oil tank back to the main oil tank 1 through a connecting pipeline, and the waste oil discharge tank is connected with the main oil tank 1, the clean oil tank and the dirty oil tank.
When the system operates, lubricating oil in the main oil tank is conveyed to each bearing of the steam turbine through an oil cooler (a filter can be put into operation or bypassed according to actual requirements) by an alternating-current lubricating oil pump or a direct-current lubricating oil pump, and the bearing is arranged in the bearing box.
A method for flushing the pipeline of lubricating oil system of steam turbine includes
And 2, injecting the temporary flushing oil into a clean oil tank or a dirty oil tank which is cleaned up.
And 3, circularly flushing the temporary flushing oil among the main oil tank, the clean oil tank, the dirty oil tank and the connecting pipeline through the oil supply pump and the oil delivery pump until the total amount of impurities collected by an oil return filter screen is not more than 1.0g after the flushing time is 8 hours, and completely discharging the temporary flushing oil to an outdoor oil storage device. The outdoor oil storage device can be an outdoor temporary oil tank or an oil drum.
And 4, manually cleaning the interiors of the main oil tank, the clean oil tank and the dirty oil tank by cleaning substances. When the cleaning tool is used for cleaning, workers need to wear the coveralls and enter the main oil tank, the clean oil tank and the dirty oil tank to manually clean the inside of the main oil tank, the clean oil tank and the dirty oil tank by using dough or cement.
And 5, confirming that the necessary temporary measures are installed. The temporary measures mainly include: firstly, removing a pore plate, a filter screen and the like arranged on an oil supply pipeline; secondly, as shown in fig. 4, the joints of the oil supply pipeline 12 and each bearing 17 in the bearing box 14 are disconnected, the filter screen 13 before the oil supply pipeline 12 enters each bearing box is removed, the upper part of the end cover of the filter screen 13 is connected with a temporary hose 15, a lubricating oil distribution device 16 is arranged at the downstream of the temporary hose 15, the lubricating oil distribution device 16 is provided with four pipelines and valves, the downstream of each valve is connected with the temporary hose 15, the temporary hoses 15 are respectively led into the bearing box 14 through the manhole on the bearing box 14, and the position and the direction of each hose in the bearing box 14 can be flexibly moved so as to realize accurate flushing of each corner in the bearing box 14; and thirdly, disconnecting the pipeline of the relevant instrument of the steam turbine.
And 6, injecting the temporary flushing oil in the outdoor oil storage device into a clean oil tank or a dirty oil tank, and conveying the temporary flushing oil in the clean oil tank or the dirty oil tank to the main oil tank through an oil supply pump.
And 7, circularly flushing temporary used flushing oil among the main oil tank, the bearing tank and the oil supply pipeline by using the alternating-current lubricating oil pump and/or the direct-current lubricating oil pump until the first-stage flushing is stopped after the acceptance standard is met. The oil supply pipeline is a sleeved oil pipeline, namely a small pipeline is sleeved in a large pipeline, oil leading to the bearing box flows through the small pipeline inside, and oil returning to the main oil tank from the bearing box flows in the large pipeline through the outside of the small pipeline.
In addition, when the first-stage flushing is executed, the alternating-current lubricating oil pump or the direct-current lubricating oil pump which is configured by the system provides power for flushing, and the two pumps can be simultaneously put into operation or respectively put into operation according to the flow demand during the flushing. The outlet oil pressure and motor current of the oil pump put into operation are checked once an hour during the flushing process and recorded. If the pressure at the outlet of the oil pump is reduced, a temporary valve at the inlet of a bearing box on the platform of the steam turbine can be selectively closed or closed to reduce the flow and prevent the overload of the motor. And in the initial flushing stage, the oil return filter screen of the main oil tank is monitored, the state of the oil return filter screen is checked at any time, and if impurities are saturated, cleaning is carried out. During the washing, whether the oil leakage of the pipelines, whether the bearing box is full, whether the oil return of the main oil tank is smooth and whether the oil leakage of the temporary pipelines of the bearings is detected. The washing effect is improved by heating and cooling the oil every day in the washing process, and the cycle of heating and cooling is 14-16 hours. Firstly, the temperature of oil is raised to 40-70 ℃ through an electric heater in a main oil tank and is kept for 3 hours, then the temperature of the oil is lowered to 20-25 ℃ within 1 hour through an oil cooler and is kept for 3 hours, and the steps are repeated. Before and after each temperature rise and each temperature reduction, the lubricating oil pipeline is knocked by a wooden mallet or a rubber mallet for 30 minutes, and places where impurities such as reducing pipes and elbows are easy to gather are mainly knocked, so that the impurities attached to the pipeline are easy to fall off. In order to increase the flow rate and improve the washing efficiency, the bearing (bearing box) can be washed locally, the washing sequence and time can be changed according to the field condition, and the local washing in the bearing box is realized by adding a temporary hose and a lubricating oil distribution device. And after the oil return filter screen is washed until no large-particle impurities exist in the oil return filter screen, sampling analysis is carried out on all sampling filter screens according to a weighing sampling method, and the first-stage washing is stopped after the sampling analysis result meets the acceptance standard.
And 8, discharging all temporary flushing oil into a dirty oil tank, and manually cleaning the interiors of the main oil tank, the clean oil tank and the bearing box through cleaning substances. When the cleaning tool is used for cleaning, workers need to wear the coveralls and enter the main oil tank, the clean oil tank and the dirty oil tank to manually clean the inside of the main oil tank, the clean oil tank and the dirty oil tank by using dough or cement. And injecting the flushing temporary oil into the main oil tank through the oil supply pump after the temporary measures are modified, wherein the temporary measures are modified mainly by bringing the related instrument pipelines of the steam turbine into a flushing range.
And 9, circularly flushing temporary used oil among the main oil tank, the bearing tank and the oil supply pipeline by using the alternating-current lubricating oil pump and/or the direct-current lubricating oil pump until the second-stage flushing is stopped after the acceptance criteria are met.
In addition, when the second-stage flushing is executed, the alternating-current lubricating oil pump or the direct-current lubricating oil pump which is configured by the system provides power for flushing, the two pumps can be simultaneously put into operation according to the flow demand during the flushing, and the two pumps can also be respectively put into operation. The outlet oil pressure and motor current of the oil pump put into operation are checked once an hour during the flushing process and recorded. If the pressure at the outlet of the oil pump is reduced, a temporary valve at the inlet of a bearing box on the platform of the steam turbine can be selectively closed or closed to reduce the flow and prevent the overload of the motor. And in the initial flushing stage, the oil return filter screen of the main oil tank is monitored, the state of the oil return filter screen is checked at any time, and if impurities are saturated, cleaning is carried out. During the washing, whether the oil leakage of the pipelines, whether the bearing box is full, whether the oil return of the main oil tank is smooth and whether the oil leakage of the temporary pipelines of the bearings is detected. The washing effect is improved by heating and cooling the oil every day in the washing process, and the cycle of heating and cooling is 14-16 hours. Firstly, the temperature of oil is raised to 40-70 ℃ through an electric heater in a main oil tank and is kept for 3 hours, then the temperature of the oil is lowered to 20-25 ℃ within 1 hour through an oil cooler and is kept for 3 hours, and the steps are repeated. Before and after each temperature rise and each temperature reduction, the lubricating oil pipeline is knocked by a wooden mallet or a rubber mallet for 30 minutes, and places where impurities such as reducing pipes and elbows are easy to gather are mainly knocked, so that the impurities attached to the pipeline are easy to fall off. In order to increase the flow rate and improve the washing efficiency, the bearing (bearing box) can be washed locally, the washing sequence and time can be changed according to the field condition, and the local washing in the bearing box is realized by adding a temporary hose and a lubricating oil distribution device. And after the oil return filter screen is washed until no large-particle impurities exist in the oil return filter screen, sampling analysis is carried out on all sampling filter screens according to a weighing sampling method, and the second stage of washing is stopped after the sampling analysis result meets the acceptance standard.
And step 10, discharging all the temporary flushing oil to a peripheral storage oil tank, wherein the oil discharge needs to ensure that residual oil in all pipelines and equipment of the system is discharged completely, and the temporary flushing oil can be reused after being purified and tested to be qualified.
And 11, removing all temporary measures, recovering the connection of the related instrument pipelines of the steam turbine, and manually cleaning the interiors of the bearing box, the main oil tank, the clean oil tank and the dirty oil tank through cleaning substances. When the cleaning tool is used for cleaning, workers need to wear the coveralls and enter the main oil tank, the clean oil tank and the dirty oil tank to manually clean the inside of the main oil tank, the clean oil tank and the dirty oil tank by using dough or cement.
And 12, injecting formal lubricating oil into the clean oil tank or the dirty oil tank, and conveying the formal lubricating oil in the clean oil tank or the dirty oil tank to the main oil tank through the oil supply pump.
And step 13, circularly flushing temporary used oil among the main oil tank, the bearing tank and the oil supply pipeline by the alternating-current lubricating oil pump and/or the direct-current lubricating oil pump until the acceptance standard is met, and stopping flushing in the third stage.
In addition, when the third-stage flushing is executed, the alternating-current lubricating oil pump or the direct-current lubricating oil pump which is configured by the system provides power for flushing, the two pumps can be simultaneously put into operation according to the flow demand during the flushing, and the two pumps can also be respectively put into operation. The flowing condition of oil in each bearing box is monitored in the washing process, the washing effect is improved through the temperature rise and the temperature reduction of the oil in the washing process of the oil return filter screen which is used for checking and timely cleaning the main oil tank every day in the washing process, and the period of the temperature rise and the temperature reduction is 14-16 hours. Firstly, the temperature of the oil is raised to 40-70 ℃ through an electric heater in a main oil tank and kept for 3 hours, then the temperature of the oil is reduced to 20-25 ℃ within 1 hour through an oil cooler and kept for 3 hours, and the steps are repeated. Before and after each temperature rise and each temperature reduction, the lubricating oil pipeline is knocked by a wooden mallet or a rubber mallet for 30 minutes, and places where impurities such as reducing pipes and elbows are easy to gather are mainly knocked, so that the impurities attached to the pipeline are easy to fall off. And after the oil return filter screen is washed until no large-particle impurities exist in the oil return filter screen, sampling and analyzing the oil return filter screen at all sampling filter screens according to a weighing and sampling method, and stopping washing at the third stage after the sampling and analyzing result meets the acceptance standard.
Wherein, the acceptance standard is specifically that the total amount of impurities collected by an oil return filter screen is not more than 1.0g after the washing in the first stage is carried out for 8 hours, the maximum hard particulate matter and the maximum soft particulate matter are not more than 0.12 mm, and the maximum fibrous impurities are not more than 0.16 mm; washing in the second stage, wherein the total amount of impurities collected by an oil return filter screen is not more than 0.5g, the maximum hard particulate matter and the maximum soft particulate matter are not more than 0.12 mm, and the maximum fibrous impurities are not more than 0.16 mm after the washing time is 24 hours; and in the third stage of washing, the total amount of impurities collected by an oil return filter screen is not more than 0.5g after the washing time is 24 hours, the maximum hard particles and the maximum soft particles are not more than 0.12 mm, and the maximum fibrous impurities are not more than 0.16 mm.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (7)
1. A method for flushing a pipeline of a turbine lubricating oil system is characterized by comprising the following steps: comprises that
Step 1, manually cleaning the interiors of a main oil tank, a clean oil tank and a dirty oil tank by cleaning substances;
step 2, injecting temporary washing oil into a clean oil tank or a dirty oil tank which is cleaned up;
step 3, circularly flushing temporary flushing oil among the main oil tank, the clean oil tank, the dirty oil tank and the connecting pipeline through the oil supply pump and the oil transfer pump until the total amount of impurities collected by an oil return filter screen is not more than 1.0g after the flushing time is 8 hours, and completely discharging the temporary flushing oil to an outdoor oil storage device;
step 4, manually cleaning the interiors of the main oil tank, the clean oil tank and the dirty oil tank by cleaning substances;
step 5, confirming that necessary temporary measures are installed; the temporary measures specifically comprise removing a pore plate and a filter screen arranged on the oil supply pipeline; disconnecting the connection part of an oil supply pipeline and each bearing in the bearing box, removing a filter screen before the oil supply pipeline enters each bearing box, connecting a temporary hose to the upper part of an end cover of the filter screen, arranging a lubricating oil distribution device at the downstream of the temporary hose, wherein the distribution device is provided with four pipelines and valves, the downstream of each valve is connected with the temporary hose, and the temporary hoses are respectively led into the bearing box through a manhole on the bearing box; disconnecting the pipeline of the relevant instrument of the steam turbine;
step 6, injecting the temporary flushing oil in the outdoor oil storage device into a clean oil tank or a dirty oil tank, and conveying the temporary flushing oil in the clean oil tank or the dirty oil tank to a main oil tank through an oil supply pump;
step 7, flushing temporary oil among the main oil tank, the bearing tank and the oil supply pipeline by using an alternating-current lubricating oil pump and/or a direct-current lubricating oil pump in a circulating manner until the inspection and acceptance standards are met, and stopping the first-stage flushing; step 7, heating and cooling the temporary oil for flushing, specifically, heating the oil for flushing the temporary oil to 40-70 ℃ by an electric heater in the main oil tank and keeping the temperature for 3 hours, and knocking the oil supply pipeline for 30 minutes by a knocking tool before heating; the oil temperature of the temporary washing oil is reduced to 20-25 ℃ within 1 hour through an oil cooler and is kept for 3 hours, and after the temperature reduction operation is carried out, the oil supply pipeline is knocked for 30 minutes through a knocking tool;
step 8, discharging all temporary flushing oil into a dirty oil tank, manually cleaning the interiors of a main oil tank, a clean oil tank and a bearing box through cleaning substances, and injecting the temporary flushing oil into the main oil tank through an oil supply pump after temporary measures are modified;
step 9, flushing temporary oil among the main oil tank, the bearing tank and the oil supply pipeline by using the alternating-current lubricating oil pump and/or the direct-current lubricating oil pump in a circulating manner until the inspection and acceptance standards are met, and stopping flushing in the second stage; step 9, heating and cooling the temporary washing oil, specifically, heating the temporary washing oil to 40-70 ℃ by an electric heater in the main oil tank and keeping the temperature for 3 hours, and knocking the oil supply pipeline for 30 minutes by a knocking tool before heating; the oil temperature of the temporary washing oil is reduced to 20-25 ℃ within 1 hour through an oil cooler and is kept for 3 hours, and after the temperature reduction operation is carried out, the oil supply pipeline is knocked for 30 minutes through a knocking tool;
step 10, discharging all the temporary flushing oil to a peripheral storage oil tank;
step 11, removing all temporary measures, recovering the connection of the pipelines of the relevant instruments of the steam turbine, and manually cleaning the interiors of the bearing box, the main oil tank, the clean oil tank and the dirty oil tank through cleaning substances;
step 12, injecting formal lubricating oil into the clean oil tank or the dirty oil tank, and conveying the formal lubricating oil in the clean oil tank or the dirty oil tank to the main oil tank through an oil supply pump;
step 13, circularly flushing formal lubricating oil among a main oil tank, a bearing tank and an oil supply pipeline through an alternating-current lubricating oil pump and/or a direct-current lubricating oil pump until the formal lubricating oil meets the acceptance standard, and stopping flushing at the third stage; step 13 is to perform heating and cooling operations on the formal lubricating oil, specifically to heat the oil of the formal lubricating oil to 40-70 ℃ by an electric heater in the main oil tank and keep the temperature for 3 hours, and knocking the oil supply pipeline for 30 minutes by a knocking tool before the heating operation is performed; the oil temperature of the formal lubricating oil is reduced to 20-25 ℃ within 1 hour through an oil cooler and is kept for 3 hours, and the oil supply pipeline is knocked for 30 minutes through a knocking tool after the temperature reduction operation is carried out.
2. The method for flushing the turbine lubricating oil system pipeline according to claim 1, wherein: the step 7 or the step 9 or the step 13 further comprises the step of locally washing the bearing in the bearing box through a temporary hose and a lubricating oil distribution device.
3. The method for flushing the turbine lubricating oil system pipeline according to claim 1, wherein: the cycle of the heating and cooling operation is 14-16 hours.
4. The method for flushing the turbine lubricating oil system pipeline according to claim 1, wherein: in the step 8, modifying the temporary measure specifically includes
And (4) bringing the relevant instrument pipeline of the steam turbine into a flushing range.
5. The method for flushing the turbine lubricating oil system pipeline according to claim 1, wherein: the acceptance criteria specifically include
Flushing at a first stage, wherein the total amount of impurities collected by an oil return filter screen is not more than 1.0g, the maximum hard particulate matter and the maximum soft particulate matter are not more than 0.12 mm, and the maximum fibrous impurities are not more than 0.16 mm when the flushing time is 8 hours;
washing in the second stage, wherein the total amount of impurities collected by an oil return filter screen is not more than 0.5g, the maximum hard particulate matter and the maximum soft particulate matter are not more than 0.12 mm, and the maximum fibrous impurities are not more than 0.16 mm after the washing time is 24 hours;
and in the third stage of washing, the total amount of impurities collected by an oil return filter screen is not more than 0.5g after the washing time is 24 hours, the maximum hard particles and the maximum soft particles are not more than 0.12 mm, and the maximum fibrous impurities are not more than 0.16 mm.
6. The method for flushing the turbine lubricating oil system pipeline according to claim 1, wherein: the striking tool comprises a wooden mallet or a rubber mallet.
7. The method for flushing the turbine lubricating oil system pipeline according to claim 1, wherein: the cleaning substance comprises a dough or a mastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010210584.0A CN111271139B (en) | 2020-03-24 | 2020-03-24 | Method for flushing pipeline of turbine lubricating oil system |
Applications Claiming Priority (1)
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| CN202010210584.0A CN111271139B (en) | 2020-03-24 | 2020-03-24 | Method for flushing pipeline of turbine lubricating oil system |
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| CN205117422U (en) * | 2015-10-10 | 2016-03-30 | 山东电力建设第一工程公司 | Turbo generator set lubricating oil system's rinse -system |
| CN107605552B (en) * | 2017-08-03 | 2020-05-19 | 山东电力建设第一工程公司 | Lubricating and flushing system for lubricating oil pipeline of steam turbine generator unit |
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