Protection device for preventing EH oil temperature of steam turbine from rising
Through the steam turbine EH oil temperature regulation system designed with dual oil chiller and redundant pipelines, the problem of easy failure caused by a single design of cooling water pipelines is solved, and the stable cooling of EH oil temperature and high reliability operation of the system is achieved.
Patent Information
- Application Number
- CN202421665766.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-15
AI Technical Summary
In the existing EH oil temperature regulation system of the turbine, the single design of the cooling water pipeline is prone to interruption of the cooling water due to the failure of the solenoid valve, which in turn leads to an increase in the EH oil temperature, affecting the safe and stable operation of the unit.
The dual oil cooler and redundant pipeline design are adopted. The EH oil is heat exchanged and cooled down through two oil coolers, and the redundant pipeline and valve design is designed to ensure that even if some pipelines or valves fail, the supply of cooling water will not be affected.
It can ensure normal cooling of EH oil temperature in the event of failure, avoid oil quality deterioration and unit operation failure, and improve the reliability and safety of the system.
Smart Images
Figure CN222797796U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a device for preventing the temperature of EH oil of a steam turbine from rising, and belongs to the technical field of high temperature protection of EH oil of a steam turbine. Background Art
[0002] The main function of the turbine EH oil supply device is to provide the pressure oil required by the turbine control part. The operating oil temperature of the turbine EH oil system is 35℃~57℃. EH oil is a triaryl phosphate type synthetic oil. The increase in temperature causes the oxidation and decomposition of EH oil to accelerate, the acidity to increase, and the color to deepen. When the oil temperature is higher than 60℃, the acid value of the oil increases and the oil quality will deteriorate. When the acid value of EH oil exceeds 0.15mgKOH / g, the high acidity of EH oil will cause problems such as precipitation and foaming characteristics of EH oil. The increase in acid value accelerates the corrosion of components in the system (such as sealing rings, sliding valve bosses, valve cup sealing surfaces, etc.), reduces the safety of system operation, causes oil leakage, internal leakage, component jamming and refusal to operate, and then adjusts the system to fail, affecting the safe and stable operation of the unit.
[0003] At present, the EH oil temperature of the steam turbine is generally cooled by an oil cooler to meet the normal operation of the steam turbine. The cooling method of the oil cooler is to exchange heat between "water" and "EH oil" to reduce the temperature of the EH oil. The existing oil cooler cooling water inlet and outlet pipelines have only one pipeline, and a solenoid valve is installed on the pipeline. The solenoid valve controls the opening and closing of the water supply pipeline. In the actual operation process, the heat of the "EH oil" in the oil cooler is exchanged with water, and the water is discharged from the outlet pipeline. The solenoid valve installed on the outlet pipeline is easily damaged by high temperature or the solenoid valve fails during operation. The cooling water is interrupted, which will cause the EH oil temperature to rise. If the EH oil temperature is maintained at a high temperature for a long time, it is easy to cause oil quality deterioration, which indirectly leads to turbine operation failure.
[0004] Based on the above problems, it is urgent to propose a turbine EH oil temperature rise protection device to solve the above problems. Utility Model Content
[0005] The utility model is to solve the above-mentioned technical problems. A brief overview of the utility model is given below to provide a basic understanding of certain aspects of the utility model. It should be understood that this overview is not an exhaustive overview of the utility model. It is not intended to determine the key or important parts of the utility model, nor is it intended to limit the scope of the utility model.
[0006] The technical solution of this utility model:
[0007] A protection device for preventing the EH oil temperature of a steam turbine from rising, comprising a circulating water inlet pipeline, a circulating water outlet pipeline, a circulating water inlet branch, a circulating water outlet branch, a first oil cooler inlet pipeline, a second oil cooler inlet pipeline, a first oil cooler outlet pipeline, a second oil cooler outlet pipeline, a first oil cooler and a second oil cooler, wherein the circulating water inlet pipeline and the circulating water outlet pipeline are respectively connected with a circulating water inlet branch and a circulating water outlet branch;
[0008] The water inlet of the first oil cooler and the water inlet of the second oil cooler are respectively connected with a first oil cooler water inlet pipeline and a second oil cooler water inlet pipeline, and the second oil cooler water inlet pipeline and the first oil cooler water inlet pipeline are connected with the circulating water inlet branch after merging;
[0009] The water outlet of the first oil cooler and the water outlet of the second oil cooler are respectively connected with the first oil cooler water outlet pipeline and the second oil cooler water outlet pipeline. The first oil cooler water outlet pipeline and the second oil cooler water outlet pipeline are connected with the circulating water outlet branch after converging.
[0010] Preferably: a water inlet branch valve is installed on the circulating water inlet branch, and a water outlet branch valve is installed on the circulating water outlet branch.
[0011] Preferably: a first water inlet valve is installed on the water inlet pipe of the first oil cooler, a second water inlet valve is installed on the water inlet pipe of the second oil cooler, a first water outlet valve is installed on the water outlet pipe of the first oil cooler, and a second water outlet valve is installed on the water outlet pipe of the second oil cooler.
[0012] Preferably: the first oil cooler water outlet pipeline is connected in parallel with a first oil cooler standby water outlet pipeline, a third water outlet valve is installed on the first oil cooler standby water outlet pipeline, the second oil cooler water outlet pipeline is connected in parallel with a second oil cooler standby water outlet pipeline, a fourth water outlet valve is installed on the second oil cooler standby water outlet pipeline.
[0013] Preferably: it also includes a water filter pipeline, one end of which is connected to the first oil cooler outlet pipeline, and the other end of which is connected to the circulating water outlet branch, and a water filter switch valve, a water filter and a one-way valve are installed on the water filter pipeline.
[0014] The utility model has the following beneficial effects:
[0015] The utility model is a protection device for preventing the EH oil temperature of a steam turbine from rising. It uses two oil coolers and pipeline designs to form a steam turbine EH oil temperature rising protection system. The two oil coolers can realize heat exchange and cooling of the steam turbine EH oil temperature respectively. In the water supply and return process of the two oil coolers, the water inlets of the two oil coolers are respectively connected to the first oil cooler water inlet pipeline and the second oil cooler water inlet pipeline, and the water outlets of the two oil coolers are respectively connected to the first oil cooler water outlet pipeline and the second oil cooler water outlet pipeline. Even if the valve on the pipeline fails, it will not affect the interruption of cooling water. The oil cooler of the utility model adopts a redundant design, which can ensure that the EH oil temperature is maintained within the allowable range, avoiding abnormal oil temperature, increased oil acidity, and thus threatening the safe operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a pipe connection device to prevent the EH oil temperature of the steam turbine from rising. Figure 1 ;
[0017] Figure 2 It is a pipe connection device to prevent the EH oil temperature of the steam turbine from rising. Figure 2 ;
[0018] Figure 3 A pipe connection of a protection device for preventing the EH oil temperature of a steam turbine from rising in a specific implementation method 3 Figure 1 ;
[0019] In the figure, 1-circulating water inlet pipeline, 2-circulating water outlet pipeline, 3-circulating water inlet branch, 4-circulating water outlet branch, 5-first oil cooler inlet pipeline, 6-second oil cooler inlet pipeline, 7-first oil cooler outlet pipeline, 8-second oil cooler outlet pipeline, 9-first oil cooler, 10-second oil cooler, 11-inlet branch valve, 12-outlet branch valve, 13-first inlet valve, 14-second inlet valve, 15-first outlet valve, 16-second outlet valve, 17-first oil cooler standby outlet pipeline, 18-third outlet valve, 19-second oil cooler standby outlet pipeline, 20-fourth outlet valve, 21-water filter pipeline, 22-water filter switch valve, 23-water filter, 24-check valve. DETAILED DESCRIPTION
[0020] 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.
[0021] Specific implementation method 1: Combination Figure 1-Figure 3 The present embodiment is described. A protection device for preventing the EH oil temperature of a steam turbine from rising in the present embodiment comprises a circulating water inlet pipe 1, a circulating water outlet pipe 2, a circulating water inlet branch 3, a circulating water outlet branch 4, a first oil cooler inlet pipe 5, a second oil cooler inlet pipe 6, a first oil cooler outlet pipe 7, a second oil cooler outlet pipe 8, a first oil cooler 9 and a second oil cooler 10. The circulating water inlet pipe 1 and the circulating water outlet pipe 2 are respectively connected with the circulating water inlet branch 3 and the circulating water outlet branch 4;
[0022] The water inlet of the first oil cooler 9 and the water inlet of the second oil cooler 10 are respectively connected with the first oil cooler water inlet pipeline 5 and the second oil cooler water inlet pipeline 6. The second oil cooler water inlet pipeline 6 and the first oil cooler water inlet pipeline 5 are connected with the circulating water inlet branch 3 after converging.
[0023] The water outlet of the first oil cooler 9 and the water outlet of the second oil cooler 10 are respectively connected to the first oil cooler water outlet pipeline 7 and the second oil cooler water outlet pipeline 8. The first oil cooler water outlet pipeline 7 and the second oil cooler water outlet pipeline 8 are connected to the circulating water outlet branch 4 after converging.
[0024] The circulating water inlet branch 3 is provided with an inlet branch valve 11 , and the circulating water outlet branch 4 is provided with an outlet branch valve 12 .
[0025] A first water inlet valve 13 is installed on the first oil cooler water inlet pipeline 5, a second water inlet valve 14 is installed on the second oil cooler water inlet pipeline 6, a first water outlet valve 15 is installed on the first oil cooler water outlet pipeline 7, and a second water outlet valve 16 is installed on the second oil cooler water outlet pipeline 8.
[0026] In the present embodiment, the working principle of a protection device for preventing the EH oil temperature of a steam turbine from rising is as follows: water from the circulating water inlet pipeline 1 flows into the first oil cooler inlet pipeline 5 and the second oil cooler inlet pipeline 6 respectively through the circulating water inlet branch 3, and supplies water to the first oil cooler 9 and the second oil cooler 10 through the first oil cooler inlet pipeline 5 and the second oil cooler inlet pipeline 6. In the first oil cooler 9 and the second oil cooler 10, the high-temperature EH oil exchanges heat with water to reduce the oil temperature of the EH oil. The water after heat exchange is discharged from the outlets of the first oil cooler 9 and the second oil cooler 10 into the first oil cooler outlet pipeline 7 and the second oil cooler outlet pipeline 8 respectively. The water in the first oil cooler outlet pipeline 7 and the second oil cooler outlet pipeline 8 converges and is discharged into the circulating water outlet pipeline 2 through the circulating water outlet branch 4. The above process is repeated to achieve cooling of the EH oil.
[0027] When the first oil cooler 9 or the second oil cooler 10 fails and needs maintenance, the valves on the corresponding pipelines can be closed to perform maintenance work without affecting the normal cooling of the EH oil. For example, when the first oil cooler 9 needs maintenance, the first water inlet valve 13 is closed, and the water in the circulating water inlet pipeline 1 flows directly into the second oil cooler water inlet pipeline 6 through the circulating water inlet branch 3 (since the first water inlet valve 13 is closed, the water does not enter the first oil cooler 9 at this time), and the second oil cooler 10 works to perform heat exchange and cooling for the turbine EH oil.
[0028] In this embodiment, the first oil cooler 9 and the second oil cooler 10 are used to cool the turbine EH oil at the same time, which can improve the cooling efficiency of the EH oil.
[0029] Specific implementation method 2: Combination Figure 1-Figure 3 The present embodiment is described. The present embodiment is a protection device for preventing the EH oil temperature of a steam turbine from rising. The first oil cooler outlet pipe 7 is connected in parallel with the first oil cooler standby outlet pipe 17. The first oil cooler standby outlet pipe 17 is installed with a third outlet valve 18. The second oil cooler outlet pipe 8 is connected in parallel with the second oil cooler standby outlet pipe 19. The second oil cooler standby outlet pipe 19 is installed with a fourth outlet valve 20. In this configuration, the first outlet valve 15 and the second outlet valve 16 are electromagnetic valves. A third outlet valve 18 is connected in parallel to the first outlet valve 15. A fourth outlet valve 20 is connected in parallel to the second outlet valve 16. The third outlet valve 18 and the fourth outlet valve 20 are manual ball valves DN25mm. The pressure of the manual ball valve is 1.6MPa. In normal operation, the cooling water is adjusted by opening / closing the first outlet valve 15 and / or the second outlet valve 16. Once the two valve electromagnetic valves fail, the manual ball valve is immediately opened to adjust the cooling water.
[0030] Specific implementation method three: Combination Figure 1-Figure 3 The present embodiment is described. A protection device for preventing the temperature rise of the EH oil of the steam turbine according to the present embodiment also includes a water quality filter pipeline 21. One end of the water quality filter pipeline 21 is connected to the first oil cooler outlet pipeline 7. The other end of the water quality filter pipeline 21 is connected to the circulating water outlet branch 4. A water quality filter switch valve 22, a water filter 23 and a check valve 24 are installed on the water quality filter pipeline 21. In this way, in order to improve the water quality of the circulating water in the first oil cooler 9 and the second oil cooler 10, a water quality filter pipeline 21 is connected to the first oil cooler outlet pipeline 7. The water after the heat exchange of the EH oil by the first oil cooler 9 and the second oil cooler 10 enters the water quality filter pipeline 21 through the first oil cooler outlet pipeline 7, and is filtered under the action of the water filter 23. The filtered water flows into the circulating water outlet branch 4 through the check valve 24, and finally flows into the circulating water outlet pipeline 2.
[0031] In this embodiment, water filtration can be performed regularly according to demand. When water filtration is not needed, the water filtration switch valve 22 is closed, and the return water of the first oil cooler outlet pipe 7 will not flow into the water filtration pipe 21. Under the action of the one-way valve 24, the return water will not flow back into the other end of the water filtration pipe 21. Through the pipeline system of this embodiment, the cooling water quality can be improved, which not only improves the cleanliness of the EH oil cooler but also increases the circulation rate of the cooling water.
[0032] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present utility model will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present utility model.
[0033] This implementation is only an exemplary description of this patent and does not limit its protection scope. Those skilled in the art may also make partial changes to it, as long as they do not exceed the spirit of this patent, they are all within the protection scope of this patent.
Claims
1. A protection device for preventing the EH oil temperature of a steam turbine from rising, characterized in that: It comprises a circulating water inlet pipeline (1), a circulating water outlet pipeline (2), a circulating water inlet branch (3), a circulating water outlet branch (4), a first oil cooler inlet pipeline (5), a second oil cooler inlet pipeline (6), a first oil cooler outlet pipeline (7), a second oil cooler outlet pipeline (8), a first oil cooler (9) and a second oil cooler (10), wherein the circulating water inlet pipeline (1) and the circulating water outlet pipeline (2) are respectively connected to the circulating water inlet branch (3) and the circulating water outlet branch (4); The water inlet of the first oil cooler (9) and the water inlet of the second oil cooler (10) are respectively connected to a first oil cooler water inlet pipeline (5) and a second oil cooler water inlet pipeline (6); the second oil cooler water inlet pipeline (6) and the first oil cooler water inlet pipeline (5) are connected to the circulating water inlet branch (3) after merging; The water outlet of the first oil cooler (9) and the water outlet of the second oil cooler (10) are respectively connected to a first oil cooler water outlet pipeline (7) and a second oil cooler water outlet pipeline (8); the first oil cooler water outlet pipeline (7) and the second oil cooler water outlet pipeline (8) are connected to the circulating water outlet branch (4) after merging.
2. A protection device for preventing the EH oil temperature of a steam turbine from rising according to claim 1, characterized in that: The circulating water inlet branch (3) is provided with an inlet branch valve (11), and the circulating water outlet branch (4) is provided with an outlet branch valve (12).
3. A protection device for preventing the EH oil temperature of a steam turbine from rising according to claim 1, characterized in that: A first water inlet valve (13) is installed on the first oil cooler water inlet pipeline (5), a second water inlet valve (14) is installed on the second oil cooler water inlet pipeline (6), a first water outlet valve (15) is installed on the first oil cooler water outlet pipeline (7), and a second water outlet valve (16) is installed on the second oil cooler water outlet pipeline (8).
4. A protection device for preventing the EH oil temperature of a steam turbine from rising according to claim 3, characterized in that: The first oil cooler water outlet pipeline (7) is connected in parallel with a first oil cooler standby water outlet pipeline (17), and a third water outlet valve (18) is installed on the first oil cooler standby water outlet pipeline (17); the second oil cooler water outlet pipeline (8) is connected in parallel with a second oil cooler standby water outlet pipeline (19), and a fourth water outlet valve (20) is installed on the second oil cooler standby water outlet pipeline (19).
5. A protection device for preventing the EH oil temperature of a steam turbine from rising according to claim 1, characterized in that: It also includes a water filter pipeline (21), one end of which is connected to the first oil cooler water outlet pipeline (7), and the other end of which is connected to the circulating water outlet branch (4). A water filter switch valve (22), a water filter (23) and a one-way valve (24) are installed on the water filter pipeline (21).