Rapid flushing method for high-pressure fire-resistant oil system of steam turbine

Abstract

The invention relates to a rapid flushing method for a high-pressure fire-resistant oil system of a steam turbine, which is suitable for an overhauled unit, a pipeline of the high-pressure fire-resistant oil system is connected with flushing equipment and a spare oil tank, pollutants containing the inner wall of the pipeline are discharged into the spare oil tank through reverse flushing, and a hydraulic servo-motor is also connected with the flushing equipment. And a manual valve is additionally arranged on the hydraulic servo-motor, so that residual oil can be discharged into a standby oil tank together with the manual valve and flushing equipment. The method is easy to operate, the overhauled fire-resistant oil system can be rapidly cleaned, the oil filtering period is shortened, the construction period is shortened, and the reliability and safety of the fire-resistant oil system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation, and particularly relates to a method for quickly flushing a high-pressure fire-resistant oil system of a steam turbine. Background Art

[0002] During the overhaul process of a power plant, oil flushing is a very important link. The quality of the fire-resistant oil in the EH system directly affects the later operation and maintenance of the system, and is particularly crucial for the service life of important hydraulic components. However, the construction period of the power plant is tight, and there is no time for sufficient flushing of the fire-resistant oil.

[0003] In the existing design, the oil motor cannot flush the inside of the oil cylinder. After the oil motor is overhauled, there will be a certain amount of test residual oil in the oil cylinder, which cannot be completely discharged. If this residual oil remains in the system for a long time, it is easy to cause the deterioration of the entire oil quality of the fire-resistant oil system, shorten the service life of hydraulic components, and affect the safe operation of the unit.

[0004] Moreover, a large amount of pollutants adhere to the inside of the fire-resistant oil pipeline of the unit that has been in operation for many years and cannot be cleaned in the short term. If the pollutants exist in the system for a long time, it is also easy to cause the deterioration of the fire-resistant oil, which is extremely harmful. Summary of the Invention

[0005] The present invention provides a method for quickly flushing a high-pressure fire-resistant oil system of a steam turbine, which can quickly flush the entire fire-resistant oil system, reduce the risk of damage to hydraulic components due to impurities in the oil quality, and improve the reliability and safety of the system; the operation of the present invention is simple, applicable to overhauled units, and can fully meet the strong desire of the power plant for quickly realizing oil circulation flushing of the EH system after overhaul.

[0006] The present invention provides a method for quickly flushing a high-pressure fire-resistant oil system of a steam turbine, which specifically includes: a stop valve (1), a stop valve (2), a stop valve (3), a stop valve (4), a tee (5), a tee (6), a tee (7), a short pipe (8), and a manual valve (9).

[0007] Optionally, the method for quickly flushing the high-pressure fire-resistant oil system of the steam turbine is applicable to the overhauled unit. The pipeline of the high-pressure fire-resistant oil system is connected to the flushing equipment and the standby oil tank, and the pollutants containing the inner wall of the pipeline are discharged into the standby oil tank through reverse flushing. The oil motor is also connected to the flushing equipment, and a manual valve is installed on the oil motor. Together with the manual valve and the flushing equipment, the residual oil can be discharged into the standby oil tank.

[0008] The beneficial effects are as follows: 1. The present invention can quickly and efficiently flush the overhauled EH system, ensure that the cleanliness of the system meets the use requirements after continuous flushing, and reduce the risk of damage to hydraulic components due to impurities in the oil quality.

[0009] 2. The present invention can shorten the oil flushing cycle of the overhauled unit and improve the overhaul efficiency.

[0010] 3. The structure of the present invention is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Shows a schematic diagram of equipment connection according to an embodiment of the present invention; Figure 2 Shows a pipeline flushing flow chart according to an embodiment of the present invention; Figure 3 Shows an actuator flushing flow chart according to an embodiment of the present invention; Figure 4 Shows a schematic diagram of the installation of the servomotor manual valve according to an embodiment of the present invention.

[0012] LIST OF REFERENCE NUMERALS 1. Globe valve; 2. Globe valve; 3. Globe valve; 4. Globe valve; 5. Tee; 6. Tee; 7. Tee; 8. Short pipe; 9. Manual valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] In order to make the objectives, solutions and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present invention.

[0014] Embodiment 1: Please refer to Figures 1 to 4 as shown in Taking a servomotor and its connecting pipeline as an example, the present invention will be described. Wherein, HP is the high-pressure fire-resistant oil of the system, and DP is the pressurized return oil of the system. Connect the flushing device and the spare oil tank to the connecting pipeline and the servomotor through tees (parts 5, 6, 7). This method can flush the servomotor and the pipeline simultaneously, or flush the pipeline and the actuator separately. When flushing the servomotor and the pipeline simultaneously, open the globe valves (parts 1, 2, 3), close the globe valve (part 4), install a manual valve (part ⑨) on the servomotor, start the flushing device, and operate the manual valve (part 9) simultaneously to make the servomotor in the fully open / fully closed position, repeat many times, and the waste oil from pipeline flushing and servomotor flushing flows back to the spare oil tank through the return pipe. The system flushing flow chart is as shown in Figure (1) of the attached drawings.

[0015] Embodiment 2: When flushing the pipeline separately, use a short pipe (part 8) to short-circuit the inlet and return oil pipelines of the actuator, open the globe valves (parts 1, 3), close the globe valves (parts 2, 4), start the flushing device to reverse-flush the pipeline, and the waste oil from pipeline flushing flows back to the spare oil tank through the return pipe. The system pipeline flushing flow chart is as shown in Figure (2) of the attached drawings.

[0016] Embodiment 3: When flushing the actuator alone, the stop valves (parts 3 and 4) need to be closed, and the stop valves (parts 1 and 2) need to be opened. At the same time, a manual valve (part 9) is installed on the oil motor. Start the flushing device and operate the manual valve (part 9) simultaneously to make the oil motor in the fully open / fully closed position and reciprocate multiple times. The waste oil from the flushing of the oil motor flows back to the standby oil tank through the return oil pipe. The flow chart of the oil motor flushing is shown in the attached drawing (3), and the installation schematic diagram of the oil motor manual valve is shown in the attached drawing (4).

Claims

1. A rapid flushing method for the high-pressure fire-resistant oil system of a steam turbine, comprising: Globe valve (1), globe valve (2), globe valve (3), globe valve (4), tee (5), tee (6), tee (7), short pipe (8), manual valve (9).

2. The rapid flushing method of a high-pressure fire-resistant oil system for a steam turbine according to claim 1, characterized in that Connect the high-pressure fire-resistant oil system pipeline to the flushing equipment and the standby oil tank, and discharge the pollutants containing the inner wall of the pipeline into the standby oil tank through reverse flushing.

3. The rapid flushing method of a high-pressure fire-resistant oil system for a steam turbine according to claim 1, characterized in that, The oil actuator is also connected to the flushing equipment, and a manual valve is installed on the oil actuator. Together with the manual valve and the flushing equipment, the residual oil can be discharged into the standby oil tank.

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