Control method for substance content in sealing oil, measurement test system and related device

Abstract

The invention discloses a method for controlling the content of substances in sealing oil, a measurement test system and a related device, and relates to the field of power plant generator sealing oil, the measurement test system which is the same as a sealing oil system can be constructed, and the measurement test system comprises a vacuum pump, a vacuum meter and a vacuum oil tank; the measurement test system is provided with a sealing oil supply and sampling position, and the moisture content and the air content of the sealing oil taken out from the sealing oil supply and sampling position can represent the moisture content and the air content of the sealing oil in the vacuum oil tank, so that the vacuum pump in the measurement test system can be adjusted; the vacuum pressure in a vacuum oil tank in the measurement test system is the corresponding vacuum pressure, and then the moisture content and the air content of the sealing oil taken out from the sealing oil supply and oil sampling position are detected, so that the corresponding relation between the vacuum pressure and the moisture content and the air content of the sealing oil is obtained. Therefore, the sealing oil system in a real scene can be adjusted based on the corresponding relation.

Description

Technical Field

[0001] This application relates to the field of generator seal oil in power plants, and particularly to a method for controlling the content of substances in seal oil and related devices. Background Art

[0002] Hydrogen is used as a cooling medium inside the generator because hydrogen has good thermal conductivity and low density, which can effectively improve the cooling efficiency. To prevent the leakage of hydrogen inside the generator and at the same time prevent external air from entering the generator, seal oil is used as a sealing medium. The seal oil forms an oil film through the dynamic and static gaps between the seal ring and the generator rotor and stator, playing a sealing role. In this process, the seal oil will come into contact with the hydrogen inside the generator, and the hydrogen may absorb moisture and air in the seal oil, resulting in a decrease in the purity of the hydrogen inside the generator.

[0003] In order to reduce the rate of decrease in the purity of hydrogen inside the generator, it is necessary to reduce the content of substances such as moisture and air in the seal oil. Based on this, how to reduce the content of substances in the seal oil is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] In view of the above problems, this application provides a method for controlling the content of substances in seal oil and related devices to achieve the purpose of reducing the content of substances in seal oil. The specific solutions are as follows:

[0005] In the first aspect of this application, a measurement and test system for the content of substances in seal oil is provided, including:

[0006] A vacuum pump for adjusting the vacuum pressure in the vacuum oil tank;

[0007] A vacuum gauge for displaying the vacuum pressure in the vacuum oil tank;

[0008] The vacuum oil tank for storing seal oil; the output end of the vacuum oil tank is used to output seal oil to the seal rings at both ends of the generator, and a seal oil supply, oil sampling position is provided between the output end of the vacuum oil tank and the seal rings at both ends of the generator;

[0009] A controller for constructing a correspondence between the vacuum pressure, the moisture content and the air content of the seal oil obtained from the seal oil supply, oil sampling position based on the vacuum pressure displayed by the vacuum gauge; the correspondence is the basis for adjusting the moisture content and the air content of the seal oil in the vacuum oil tank in the seal oil system.

[0010] In a possible implementation, the seal oil flowing back through the seal rings at both ends of the generator is input to the supply end of the vacuum oil tank; a seal oil make-up, oil sampling position is provided on the pipeline connected to the supply end.

[0011] In a possible implementation, the controller is further configured to:

[0012] Based on the moisture content and air content of the sealed oil obtained from the oil sampling position of the sealed oil supply oil extraction, and the moisture content and air content of the sealed oil obtained from the oil sampling position of the sealed oil makeup oil extraction, determine the removal efficiency of removing moisture and air from the sealed oil.

[0013] In a possible implementation, it further includes:

[0014] A sealed oil pump with an inlet connected to the output end of the vacuum oil tank;

[0015] A first valve with a first end connected to the outlet of the sealed oil pump, a second end of the first valve connected to the circulation port of the vacuum oil tank; a third end of the first valve is the oil sampling position for the sealed oil supply oil extraction.

[0016] The second aspect of the present application provides a method for controlling the content of substances in sealed oil, which is applied to a sealed oil system. The sealed oil system includes: a vacuum pump, a vacuum gauge, a vacuum oil tank, and a generator; the method includes:

[0017] Determine the target air content and target moisture content to be adjusted corresponding to the sealed oil in the vacuum oil tank;

[0018] Look up the target vacuum pressure corresponding to the target air content and the target moisture content from the preset corresponding relationship between the vacuum pressure and the moisture content and air content of the sealed oil;

[0019] Adjust the vacuum pump so that the vacuum pressure in the vacuum oil tank represented by the vacuum gauge is the target vacuum pressure;

[0020] Wherein, the corresponding relationship is obtained through the measurement test system for the content of substances in sealed oil in the first aspect.

[0021] In a possible implementation, the sealed oil in the vacuum oil tank in the sealed oil system is the same as the sealed oil in the vacuum oil tank in the measurement test system for the content of substances in sealed oil.

[0022] The third aspect of the present application provides a device for controlling the content of substances in sealed oil, which is applied to a sealed oil system. The sealed oil system includes: a vacuum pump, a vacuum gauge, a vacuum oil tank, and a generator; the device includes:

[0023] A determination module for determining the target air content and target moisture content to be adjusted corresponding to the sealed oil in the vacuum oil tank;

[0024] A search module, configured to search for a target vacuum pressure corresponding to the target air content and the target moisture content from a preset correspondence between the vacuum pressure and the moisture content and air content of the sealing oil;

[0025] An adjustment module, configured to adjust the vacuum pump so that the vacuum pressure in the vacuum oil tank indicated by the vacuum gauge is the target vacuum pressure;

[0026] Wherein, the correspondence is obtained through the measurement test system for the content of substances in the sealing oil in the first aspect.

[0027] A computer program product provided in the fourth aspect of the present application includes computer-readable instructions, which, when running on an electronic device, enable the electronic device to implement the control method for the content of substances in the sealing oil in the above-mentioned first aspect or any implementation manner of the first aspect.

[0028] A fifth aspect of the present application provides an electronic device, including at least one processor and a memory connected to the processor, wherein:

[0029] The memory is used to store a computer program;

[0030] The processor is configured to execute the computer program so that the electronic device can implement the control method for the content of substances in the sealing oil in the above-mentioned first aspect or any implementation manner of the first aspect.

[0031] A fifth aspect of the present application provides a computer storage medium, which carries one or more computer programs, and when the one or more computer programs are executed by an electronic device, can enable the electronic device to implement the control method for the content of substances in the sealing oil in the above-mentioned first aspect or any implementation manner of the first aspect.

[0032] With the above technical solution, the present application provides a measurement test system for the content of substances in the sealed oil. A measurement test system identical to the sealed oil system is constructed. The measurement test system includes: a vacuum pump for adjusting the vacuum pressure in the vacuum oil tank; a vacuum gauge for displaying the vacuum pressure in the vacuum oil tank; a vacuum oil tank for storing the sealed oil. The output end of the vacuum oil tank is used to output the sealed oil to the sealing glands at both ends of the generator. There is a position for taking oil samples of the sealed oil supply between the output end of the vacuum oil tank and the sealing glands at both ends of the generator. Since there is a position for taking oil samples of the sealed oil supply in the measurement test system, the moisture content and air content of the sealed oil taken from the position for taking oil samples of the sealed oil supply can represent the moisture content and air content of the sealed oil in the vacuum oil tank. Therefore, the vacuum pump in the measurement test system can be adjusted so that the vacuum pressure in the vacuum oil tank in the measurement test system is the corresponding vacuum pressure. Then, the moisture content and air content of the sealed oil taken from the position for taking oil samples of the sealed oil supply are detected to obtain the corresponding relationship between the vacuum pressure and the moisture content and air content of the sealed oil. Thus, the vacuum pump of the sealed oil system in the real scenario can be adjusted based on this corresponding relationship. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In combination with the accompanying drawings and with reference to the following specific embodiments, the above and other features, advantages and aspects of the various embodiments of the present disclosure will become more apparent. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the original components and elements are not necessarily drawn to scale.

[0034] Figure 1a Schematic diagram of the first implementation manner of the hydrogen cooling cycle of the generator provided by the embodiment of the present application;

[0035] Figure 1b Schematic diagram of the second implementation manner of the hydrogen cooling cycle of the generator provided by the embodiment of the present application;

[0036] Figure 2 Schematic diagram of the vacuum oil tank provided by the embodiment of the present application;

[0037] Figure 3 Schematic diagram of the on-site of the measurement test system provided by the embodiment of the present application;

[0038] Figure 4 Schematic diagram of an implementation manner of the measurement test system provided by the embodiment of the present application;

[0039] Figure 5 Simplified schematic diagram of taking oil samples of the sealed oil provided by the embodiment of the present application;

[0040] Figure 6 Curve graph of the moisture content, air content and vacuum pressure in the sealed oil provided by the embodiment of the present application;

[0041] Figure 7 It is a schematic flow chart of a method for controlling the content of substances in the sealed oil provided by an embodiment of the present application;

[0042] Figure 8 It is a schematic structural diagram of a device for controlling the content of substances in the sealed oil provided by an embodiment of the present application. Detailed implementation manners

[0043] The following describes the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. The terms used in the embodiment part of the present application are only used to explain the specific embodiments of the present application, rather than aiming to limit the present application.

[0044] The following describes the embodiments of the present application in conjunction with the accompanying drawings. Those skilled in the art know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0045] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing when describing objects with the same attributes in the embodiments of the present application. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product or device including a series of units does not have to be limited to those units, but may include other units not clearly listed or inherent to these processes, methods, products or devices.

[0046] During the operation of the generator, a large amount of heat will be generated, which will cause the internal temperature of the generator to rise, resulting in a decrease in the efficiency of the generator, a shortening of its life, and potential fire safety hazards. Therefore, a cooling system is needed to control the internal temperature of the generator to ensure that the generator can operate under safe and efficient conditions.

[0047] Exemplarily, the cooling system can adopt the water-hydrogen-hydrogen cooling method for cooling, that is, hydrogen is used as the cooling medium inside the generator because hydrogen has excellent thermal conductivity, a small specific gravity, and high cooling efficiency. Compared with air, hydrogen is not an oxidant, which can prevent the insulation material from aging prematurely due to lack of oxygen, and there is no risk of ozone formation. In addition, pressurized hydrogen can also suppress partial discharge. As a better electrical insulator, a higher voltage is required to cause electrical breakdown.

[0048] Due to its excellent thermal conductivity, small specific gravity, and high cooling efficiency, hydrogen is widely used in the cooling systems of large generators above 200MW.

[0049] It is understandable that hydrogen circulates inside the generator, taking away the heat generated during the operation of the generator.

[0050] Exemplarily, the generator can be a nuclear power half-speed steam turbine generator set, such as the Arabella-type nuclear power half-speed steam turbine generator set. Exemplarily, the model of this generator is TA1100-78.

[0051] To prevent the leakage of hydrogen inside the generator, a seal oil system is adopted as the sealing medium. The seal oil system provides seal oil to the shaft ends of the generator to prevent hydrogen from leaking out along the dynamic and static gaps between the rotor and stator of the generator. At the same time, the seal oil can also prevent the atmosphere from polluting the hydrogen inside the generator. The seal oil system is specifically used to provide seal oil to the seal glands at both ends of the generator and maintain the oil pressure higher than the hydrogen pressure inside the generator by a certain value to prevent hydrogen leakage, while also avoiding excessive oil pressure that may cause a large amount of seal oil to enter the generator interior.

[0052] The following describes the process of the seal oil system providing seal oil to the seal glands at both ends of the generator.

[0053] As Figure 1a shown, it is a schematic diagram of the first implementation method of the hydrogen cooling cycle of the generator provided by the embodiment of the present application.

[0054] Exemplarily, the seal oil system includes, but is not limited to: a vacuum pump 101, a vacuum oil tank 102, a seal oil pump 103, a first valve 104, a first filter 105, an oil-hydrogen differential pressure valve 106, a second valve 107, a second filter 108, an oil-gas separator 109, a smoke exhaust fan 110, and a hydrogen-side return oil tank 111. Figure 1a It also includes a generator 112.

[0055] The following explains the principle of reducing the heat generated by the generator 112 through the seal oil system.

[0056] The vacuum pump 101 is used to adjust the vacuum pressure inside the vacuum oil tank 102 so that the vacuum oil tank 102 maintains a certain degree of vacuum, reducing the solubility of air and moisture in the seal oil and promoting the precipitation of air and moisture from the seal oil, thereby purifying the seal oil.

[0057] The vacuum oil tank 102 is a container for storing the seal oil that has undergone vacuum treatment.

[0058] The seal oil pump 103 is responsible for transporting the treated seal oil to the seal glands at both ends of the generator to ensure the circulating flow of the seal oil and maintain the sealing and lubrication of the generator.

[0059] The first valve 104 is used to control the flow rate of the seal oil flowing into the vacuum oil tank and adjust the supply amount of the seal oil provided to the generator.

[0060] The first filter 105 is installed at the outlet of the seal oil pump 103 to remove impurities and particles in the seal oil entering the seal glands at both ends of the generator.

[0061] The oil-hydrogen differential pressure valve 106 is used to regulate the pressure of the seal oil, ensuring that the oil pressure is higher than the hydrogen pressure to prevent hydrogen leakage, and at the same time avoiding excessive oil pressure that may cause a large amount of oil to enter the generator interior.

[0062] The second valve 107 is used to control the flow rate of the seal oil flowing into the vacuum oil tank 102.

[0063] The second filter 108 is installed at the inlet of the vacuum oil tank 102 to further remove impurities in the seal oil, ensuring the cleanliness of the seal oil and extending its service life.

[0064] The oil-gas separator 109 is used to separate gas (mainly hydrogen) from the seal oil, preventing hydrogen from circulating back to the steam turbine lubricating oil tank with the oil and accumulating in the lubricating oil tank to cause a hydrogen explosion, or preventing hydrogen from circulating back to the oil system with the oil and accumulating in the oil system to cause a hydrogen explosion.

[0065] The exhaust gas fan 110 is used to discharge the exhaust gas in the system, such as the hydrogen separated by the oil-gas separator, to ensure the safe operation of the system.

[0066] The hydrogen-side return oil tank 111 is used to collect the return oil flowing out from the hydrogen side of the generator, and this oil can be recycled after being processed.

[0067] The generator 112 is responsible for converting mechanical energy into electrical energy. The cooling system ensures that the heat generated during the operation of the generator is effectively removed to maintain the normal operating temperature of the generator.

[0068] As Figure 1b shown, it is a schematic diagram of the second implementation manner of the hydrogen cooling cycle of the generator provided by the embodiment of the present application.

[0069] Figure 1b The shown seal oil system includes: a vacuum pump 101, a vacuum oil tank 102, a seal oil pump 103, an AC standby pump 501, a DC oil pump 502, a filter 1, a filter 2, a filter 3, a filter 4, an oil-hydrogen differential pressure valve 106, an oil-gas separator 109, a first exhaust gas fan 503, a second exhaust gas fan 504, a first hydrogen-side return oil tank 505, and a second hydrogen-side return oil tank 506. Exemplarily, it further includes: a generator 112.

[0070] The functions of each module will be described below.

[0071] Exemplarily, the AC standby pump 501 may be used to provide additional oil pressure or serve as a standby oil pump to ensure the stability of the oil flow.

[0072] Exemplarily, the DC oil pump 502 may also serve as a standby oil pump or provide oil pressure under specific circumstances, enhancing the reliability of the system.

[0073] Exemplarily, Filter 1, Filter 2, Filter 3, and Filter 4 are used to remove impurities and particles in the seal oil, protecting the generator and the oil pump from wear and blockage.

[0074] Exemplarily, the first exhaust gas fan 503 and the second exhaust gas fan 504 are used to discharge the exhaust gas in the system, such as the gas separated from the oil-gas separator, ensuring the safe operation of the system.

[0075] Exemplarily, the first hydrogen-side return oil tank 505 and the second hydrogen-side return oil tank 506 are used to collect the return oil flowing out from the hydrogen side of the generator, and these oils can be recycled after being processed.

[0076] Whether Figure 1a or Figure 1b , when the seal oil is injected into the seal glands at both ends of the generator 112, part of the seal oil will flow into the pressure boundary of the generator. The seal oil is thrown out of the oil seal through the shearing action and injection in the gap, getting agitated, and exposed to a space close to pure hydrogen. Oxygen and nitrogen in the air will diffuse out of the seal oil, while hydrogen will also diffuse into the seal oil.

[0077] In summary, the above technical implementation process will cause two effects. One effect is that the air and moisture in the seal oil are added to the hydrogen, reducing the hydrogen purity; the other effect is that the contact between the seal oil and hydrogen will dissolve the hydrogen into the oil and carry it out of the generator, causing normal loss of hydrogen.

[0078] To study the dissolution of moisture and air in the seal oil at different temperatures and vacuum pressures, the present application provides a measurement test system for the content of substances in the seal oil to detect the corresponding relationship between the content of moisture and air in the seal oil and the vacuum pressure and temperature. Thus, based on this corresponding relationship, the content of moisture and air in the seal oil in the vacuum oil tank of the seal oil system in actual application is adjusted.

[0079] It can be understood that the solubility in a liquid follows Henry's law, which is applicable to the dissolution of gases in the seal oil, that is, at a certain temperature, the volume of gas dissolved in the liquid is proportional to the vacuum pressure. Air dissolves in the seal oil in a molecular state, with the same molecular state as before it was insoluble in the liquid, and may chemically react with the seal oil.

[0080] Exemplarily, the seal oil system is supplied by the lubricating oil system of the steam turbine generator set, and after being purified, boosted, filtered, and regulated by the oil-hydrogen differential pressure valve, it is supplied to the seal glands on both sides of the generator. There is no oil sampling point for air and moisture content analysis in the seal oil system in actual application.

[0081] Combined with Figure 1a and Figure 1b it can be seen that there is no oil sample sampling point in the seal oil system for analyzing the air and moisture content, otherwise there will be a situation of leaking seal oil.

[0082] In summary, there is currently a problem of frequent decline in hydrogen purity. Research shows that due to the contact of air and moisture in the seal oil with hydrogen at the seal gland, the hydrogen in the generator is contaminated, resulting in frequent decline in hydrogen purity. Due to the frequent decline in hydrogen purity, it is necessary to periodically discharge part of the low-purity hydrogen in the generator and fill in high-purity hydrogen to improve the hydrogen purity in the generator.

[0083] This application controls the air and moisture content in the seal oil to prevent the contamination of hydrogen purity, effectively solving the problem of too rapid decline in hydrogen purity of nuclear power half-speed steam turbine generator sets, which has become an urgent matter for nuclear power half-speed steam turbine generator enterprises.

[0084] In the related technology, the vacuum method is used in the seal oil system to remove moisture and air from the seal oil. As Figure 2 shown, it is a schematic diagram of a vacuum oil tank provided by an embodiment of this application. If the vacuum degree in the vacuum oil tank is lower than 80%, an alarm will be issued. Therefore, the vacuum pressure in the vacuum oil tank in the related technology is basically set to 15 kpa.a ~ 17kpa.a.

[0085] The vacuum degree refers to the degree to which the air pressure inside the vacuum oil tank is lower than the atmospheric pressure.

[0086] In the requirements of the power industry standard "Quality Standard for Seal Oil Used in Hydrogen-Cooled Generators during Operation" (DL / T705-2021), only the gas content volume fraction of the seal oil ≤ 4% and the moisture content of the seal oil ≤ 50mg / L are determined. However, it does not explain how to achieve the corresponding standards for removing air and moisture from the seal oil by the vacuum method, that is, the "corresponding relationship between the moisture and air content in the seal oil and the vacuum pressure and temperature" cannot be obtained.

[0087] Combined with Figure 1a and Figure 1b it can be seen that there is no oil sample sampling point in the seal oil system, so the air and moisture content in the seal oil cannot be analyzed; if an oil sample sampling point is set, it will lead to the situation of leaking seal oil. Since an oil sample sampling point cannot be set, the air and moisture content of the seal oil in the vacuum oil tank cannot be detected. Therefore, through Figure 1a and Figure 1b the seal oil system in cannot obtain the "corresponding relationship between the moisture and air content in the seal oil and the vacuum pressure and temperature". Based on this, the embodiment of this application manufactures a measurement test system according to the seal oil system layout.

[0088] Such as Figure 3As shown, it is a site schematic diagram of the measurement test system provided by the embodiment of the present application.

[0089] In order to establish the corresponding relationship between different vacuum pressures and the moisture content and air content in the sealing oil, a measurement test system is fabricated by simulating the actual layout of the on-site sealing oil system. The purpose is to pass the sealing oil of the same brand as the sealing oil through the vacuum oil tank of the measurement test platform, and analyze the gas and moisture content by taking oil samples, so as to achieve the effects that cannot be achieved in the actual sealing oil system.

[0090] In order to make the measurement test system consistent with the environment where the actual sealing oil system is located, the design parameters of the sealing oil system are analyzed, as shown in Table 1.

[0091] Table 1 Design parameters of the sealing oil system

[0092]

[0093] Exemplarily, the temperature of the sealing glands at both ends of the generator in the measurement test system is maintained at 45°C; the temperature of the return oil of the sealing glands in the measurement test system is maintained at 65°C; that is, the corresponding parameters in the measurement test system are set to be the same as the design parameters in Table 1, so that the "corresponding relationship between the moisture and air content in the sealing oil and the vacuum pressure and temperature" obtained by the measurement test system is more accurate.

[0094] As Figure 4 shown, it is a schematic diagram of an implementation manner of the measurement test system provided by the embodiment of the present application.

[0095] Exemplarily, the measurement test system includes but is not limited to: a vacuum pump 401, a vacuum oil tank 402, a sealing oil pump 403, a vacuum gauge 404; Exemplarily, the measurement test system may further include: a liquid level regulator 405, a make-up oil pressure gauge 406, an oil pump outlet pressure gauge 407, a vacuum break valve V3200, a vacuum pump inlet regulating valve V3011, a vacuum pump oil-gas separator inlet valve V3010, a sealing oil pump outlet flow regulating valve V3008, a sealing oil pump outlet check valve V3007, a sealing oil pump recirculation valve V3004.

[0096] As Figure 4 shown, the measurement test system further includes a plurality of valves, Figure 4 which are only examples and do not limit the number and connection relationship of the plurality of valves.

[0097] Exemplarily, the measurement test system further includes: an oil-hydrogen differential pressure valve, an oil-gas separator, an exhaust fan, and a hydrogen-side return oil tank. The relevant connection relationships can be referred to Figure 1a and Figure 1b , which will not be elaborated here.

[0098] The functions of each module in the measurement test system will be described below.

[0099] The vacuum pump 401 is used to adjust the vacuum pressure in the vacuum oil tank 402.

[0100] The vacuum gauge 404 is used to display the vacuum pressure in the vacuum oil tank 402.

[0101] The vacuum oil tank 402 is used to store the seal oil; the output end of the vacuum oil tank 402 is used to output the seal oil to the seal glands at both ends of the generator in the measurement test system, and a seal oil supply and oil sampling position 41 is provided between the output end of the vacuum oil tank 402 and the seal glands at both ends of the generator 112.

[0102] It can be understood that according to Henry's law, the amount of air dissolved in a liquid is directly proportional to the absolute pressure. At a certain temperature, the lower the absolute pressure, the smaller the liquid air content. Therefore, the higher the vacuum pressure in the vacuum oil tank, the more gas is separated from the seal oil. At the same time, when the vacuum pressure drops to the oil-air separation pressure Pg, the supersaturated air in the seal oil precipitates and aggregates around fine air bubbles to grow into larger bubbles. After the formation of larger bubbles in the limited space of the vacuum oil tank, they will enter the seal oil again under the entrainment of larger oil droplets and be sucked into the seal oil with the oil flow. When the seal oil containing bubbles enters the seal oil pump, it will rupture during the pressure boost process of the screw pump, causing disturbance to the operation of the pump. When the seal oil containing gas enters the seal gland and contacts with hydrogen, it will affect the hydrogen purity of the generator. Therefore, in the design of the vacuum oil tank, it is not only necessary to meet the requirement that the vacuum pressure reaches the gas separation pressure value, but also to provide sufficient separation area for the seal oil in the vacuum oil tank to effectively separate the gas and moisture in the oil.

[0103] The controller is used to construct the corresponding relationship between the vacuum pressure and the moisture content and air content of the seal oil based on the vacuum pressure displayed by the vacuum gauge 404, the moisture content and air content of the seal oil obtained from the seal oil supply and oil sampling position; the corresponding relationship is the basis for adjusting the moisture content and air content of the seal oil in the vacuum oil tank in the seal oil system.

[0104] Exemplarily, the moisture content and air content of the seal oil taken from the seal oil supply and oil sampling position can represent the moisture content and air content of the seal oil in the vacuum oil tank. After adjusting the vacuum pump 401, the vacuum gauge 404 can display the vacuum pressure in the vacuum oil tank; then, the seal oil is taken from the seal oil supply and oil sampling position 41, and the moisture content and air content of the seal oil are detected to obtain the corresponding relationship between the vacuum pressure and the moisture content and air content of the seal oil.

[0105] Exemplarily, the make-up oil upstream of the seal oil comes from the steam turbine lubricating oil system, and the oil in the steam turbine lubricating oil system contacts air during the operation cycle, resulting in the air and moisture content in the oil reaching the saturation state under atmospheric pressure.

[0106] Exemplarily, the seal oil flowing back from the seal glands at both ends of the generator of the test system is input to the oil supply end of the vacuum oil tank 402; a seal oil make-up oil sampling position 42 is provided on the pipeline connected to the oil supply end.

[0107] Exemplarily, based on the moisture content and air content of the seal oil obtained from the seal oil supply oil sampling position, and the moisture content and air content of the seal oil obtained from the seal oil make-up oil sampling position, the removal efficiency of removing moisture and air from the seal oil can be determined.

[0108] Exemplarily, the liquid level regulator 405 is used to monitor and control the oil level in the vacuum oil tank 402. It senses the liquid level height in the vacuum oil tank 402 and automatically adjusts the amount of oil entering or discharging from the tank according to the set liquid level range to keep the oil level within the safe operation range.

[0109] The make-up oil pressure gauge 406 is used to monitor the pressure in the make-up oil pipeline. This helps to ensure that the make-up oil process is carried out at an appropriate pressure, preventing too high or too low oil pressure from affecting the normal operation of the system.

[0110] The oil pump outlet pressure gauge 407 is used to monitor the oil pressure at the outlet of the seal oil pump. By monitoring this pressure, it can be ensured that the oil pump supplies oil at an appropriate pressure and necessary adjustments can be made to the system.

[0111] The vacuum break valve V3200 is used to release the vacuum in the vacuum oil tank 402 in case of emergency or during system maintenance. This can prevent the system from being damaged in a vacuum state and allow normal maintenance operations.

[0112] The vacuum pump inlet regulating valve V3011 is used to control the air flow entering the vacuum pump. By adjusting this valve, the pumping speed of the vacuum pump can be controlled, thus affecting the vacuum degree in the vacuum oil tank.

[0113] The vacuum pump oil-gas separator inlet valve V3010 is used to control the air flow entering the vacuum pump oil-gas separator. This valve helps to separate the gas and oil pumped out from the vacuum oil tank to ensure the purity of the seal oil.

[0114] The seal oil pump outlet flow regulating valve V3008 is used to regulate the oil flow at the outlet of the seal oil pump. By adjusting this valve, the oil supply amount can be controlled to meet the needs of the generator seal system.

[0115] The check valve V3007 at the outlet of the seal oil pump is used to prevent the seal oil from flowing back when the seal oil pump stops running. This can protect the oil pump from damage caused by backflow and maintain the stable operation of the system.

[0116] The seal oil recirculation valve V3004 is used to control the recirculation of the seal oil. When the pressure or flow rate at the outlet of the seal oil pump exceeds the set value, this valve can guide the excess oil back to the oil tank to avoid system overload.

[0117] The implementation principle of the measurement test system is the same as that of Figure 1a and Figure 1b the test principle in, which will not be elaborated here.

[0118] Through Figure 4 it can be known that the measurement test system also includes: valve V3012, valve V3002, valve V3003, valve V3004, valve V3301.

[0119] Exemplarily, in combination with Table 1, the oil supply temperature of the seal tile is 45 °C, so the temperature of the seal oil in the vacuum oil tank 402 is 45 °C. Therefore, during the construction of the "corresponding relationship between vacuum pressure and moisture content and air content of the seal oil", the temperature of the seal oil in the vacuum oil tank 402 is set to 45 °C. Since the temperature is constant at 45 °C, the "corresponding relationship between vacuum pressure and moisture content and air content of the seal oil" constructed does not include temperature.

[0120] Combined with Figure 1a , Figure 1b and Figure 4 the specific positions of the seal oil supply oil sampling position 41 and the seal oil make-up oil sampling position 42 can be seen. To further illustrate the specific positions of the seal oil supply oil sampling position 41 and the seal oil make-up oil sampling position 42, the following will be described in combination with Figure 5 for illustration.

[0121] As Figure 5 shown, it is a simplified schematic diagram of seal oil sampling provided by the embodiment of the present application.

[0122] Exemplarily, the gas components in the seal oil sample can be separated and detected by a gas chromatograph, and data collection and collation can be carried out. Exemplarily, the oil sample analysis results shown in Table 2 can be obtained.

[0123] Table 2 Oil Sample Analysis Results

[0124]

[0125] Exemplarily, the curve graphs of the moisture content, air content and vacuum pressure in the seal oil can be drawn according to the oil sample analysis results. As Figure 6As shown, it is a curve graph of the moisture content, air content, and vacuum pressure in the seal oil provided by the embodiment of the present application.

[0126] Figure 6 Among them, counting from top to bottom, the first curve is the moisture content curve, the second curve is the nitrogen content curve, and the third curve is the oxygen content curve.

[0127] A controller is used to construct the corresponding relationship between the vacuum pressure and the moisture content and air content of the seal oil based on the vacuum pressure shown by the vacuum gauge, the moisture content and air content of the seal oil obtained from the seal oil supply and oil sampling position; the corresponding relationship is the basis for adjusting the moisture content and air content of the seal oil in the vacuum tank of the seal oil system.

[0128] The embodiment of the present application provides a measurement test system for the substance content in the seal oil. A measurement test system identical to the seal oil system is constructed. The measurement test system includes: a vacuum pump for adjusting the vacuum pressure in the vacuum tank; a vacuum gauge for displaying the vacuum pressure in the vacuum tank; a vacuum tank for storing the seal oil; the output end of the vacuum tank is used to output the seal oil to the seal tiles at both ends of the generator, and a seal oil supply and oil sampling position is provided between the output end of the vacuum tank and the seal tiles at both ends of the generator; since there is a seal oil supply and oil sampling position in the measurement test system, the moisture content and air content of the seal oil taken from the seal oil supply and oil sampling position can represent the moisture content and air content of the seal oil in the vacuum tank, so the vacuum pump in the measurement test system can be adjusted to make the vacuum pressure in the vacuum tank of the measurement test system the corresponding vacuum pressure, and then the moisture content and air content of the seal oil taken from the seal oil supply and oil sampling position are detected to obtain the corresponding relationship between the vacuum pressure and the moisture content and air content of the seal oil. Thus, the vacuum pump of the seal oil system in the real scenario can be adjusted based on this corresponding relationship.

[0129] Refer to Figure 7 , Figure 7 is a schematic flowchart of a control method for the substance content in the seal oil provided by the embodiment of the present application. As Figure 7 shown, a control method for the substance content in the seal oil provided by the embodiment of the present application may include steps S701 to S703, and these steps will be described in detail below.

[0130] Step S701: Determine the target air content and target moisture content to be adjusted corresponding to the seal oil in the vacuum tank.

[0131] Among them, the seal oil in the vacuum tank of the seal oil system is the same as the seal oil in the vacuum tank of the measurement test system for the substance content in the seal oil.

[0132] Step S702: Look up the target vacuum pressure corresponding to the target air content and the target moisture content from the preset correspondence between the vacuum pressure and the moisture content and air content of the sealing oil.

[0133] The "correspondence between the vacuum pressure and the moisture content and air content of the sealing oil" is obtained through a measurement test system for the substance content in the sealing oil.

[0134] Step S703: Adjust the vacuum pump so that the vacuum pressure in the vacuum oil tank represented by the vacuum gauge is the target vacuum pressure.

[0135] The embodiment of the present application provides a method for controlling the substance content in the sealing oil. Since the "correspondence between the vacuum pressure and the moisture content and air content of the sealing oil" has been obtained through the measurement test system for the substance content in the sealing oil, the vacuum pressure in the vacuum oil tank can be determined to be adjusted to the target vacuum pressure according to the target air content and the target moisture content. By adjusting the vacuum pump so that the vacuum pressure shown by the vacuum gauge is the target vacuum pressure, the moisture content of the sealing oil in the vacuum oil tank is the target moisture content, and the air content of the sealing oil in the vacuum oil tank is the target air content. In the process of adjusting the air content and moisture content of the sealing oil in the vacuum oil tank of the actual sealing oil system, the "correspondence between the vacuum pressure and the moisture content and air content of the sealing oil" has very important guiding significance.

[0136] The above introduces a method for controlling the substance content in the sealing oil provided by the embodiment of the present application. The following will introduce the device for executing the above method for controlling the substance content in the sealing oil.

[0137] Please refer to Figure 8 , Figure 8 which is a schematic structural diagram of a device for controlling the substance content in the sealing oil provided by the embodiment of the present application. As Figure 8 shown, the device for controlling the substance content in the sealing oil includes:

[0138] A determination module 801, configured to determine the target air content and target moisture content to be adjusted corresponding to the sealing oil in the vacuum oil tank;

[0139] A lookup module 802, configured to look up the target vacuum pressure corresponding to the target air content and the target moisture content from the preset correspondence between the vacuum pressure and the moisture content and air content of the sealing oil;

[0140] An adjustment module 803, configured to adjust the vacuum pump so that the vacuum pressure in the vacuum oil tank represented by the vacuum gauge is the target vacuum pressure;

[0141] Among them, the corresponding relationship is obtained by the measurement test system for the content of substances in the sealed oil in the measurement test system for the content of substances in the sealed oil.

[0142] In a possible implementation, the sealed oil in the vacuum oil tank in the sealed oil system is the same as the sealed oil in the vacuum oil tank in the measurement test system for the content of substances in the sealed oil.

[0143] An embodiment of the present application also provides a computer program product, including computer-readable instructions, which when running on an electronic device, enable the electronic device to implement any one of the control methods for the content of substances in the sealed oil provided by the embodiments of the present application.

[0144] An embodiment of the present application also provides a computer-readable storage medium, which carries one or more computer programs. When the one or more computer programs are executed by an electronic device, they can enable the electronic device to implement any one of the control methods for the content of substances in the sealed oil provided by the embodiments of the present application.

[0145] In addition, it should be noted that the device embodiments described above are only illustrative. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the device embodiments provided in the present application, the connection relationship between the modules indicates that they have a communication connection, which can be specifically implemented as one or more communication buses or signal lines.

[0146] Through the description of the above embodiments, those skilled in the art can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course, it can also be implemented by dedicated hardware including dedicated integrated circuits, dedicated CPUs, dedicated memories, dedicated components, etc. Generally, functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structures for implementing the same function can also be various, such as analog circuits, digital circuits or dedicated circuits. However, for the present application, in more cases, software program implementation is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a readable storage medium, such as a floppy disk, U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disc of a computer, and includes several instructions to enable a computer device (which can be a personal computer, a training device, or a network device, etc.) to execute the methods described in the various embodiments of the present application.

[0147] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product.

[0148] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another, for example, the computer instructions may be transmitted from a website, a computer, a training device, or a data center to another website, a computer, a training device, or a data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or a wireless manner (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device or a data center that includes one or more integrated available media. The available medium may be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)).

Claims

1. A test system for measuring the substance content in sealing oil, characterized in that: include: A vacuum pump, used to adjust the vacuum pressure in the vacuum tank; A vacuum gauge, used to display the vacuum pressure in the vacuum oil tank; The vacuum oil tank is used to store sealing oil; the output end of the vacuum oil tank is used to output sealing oil to the sealing shoes at both ends of the generator, and a sealing oil supply and oil sampling position is provided between the output end of the vacuum oil tank and the sealing shoes at both ends of the generator; The controller is used to establish a corresponding relationship between the vacuum pressure and the moisture content and air content of the sealing oil based on the vacuum pressure displayed by the vacuum gauge and the moisture content and air content of the sealing oil obtained from the sealing oil supply and oil sampling position; the corresponding relationship is the basis for adjusting the moisture content and air content of the sealing oil in the vacuum oil tank in the sealing oil system.

2. The measuring test system for the substance content in sealing oil according to claim 1, characterized in that: in, The sealing oil refluxed through the sealing shoes at both ends of the generator is input to the oil supply end of the vacuum oil tank; a sealing oil replenishment and oil sampling position is arranged on the pipeline connected to the oil supply end.

3. The measuring test system for the substance content in sealing oil according to claim 2, characterized in that: The controller is further used for: Based on the moisture content and air content of the sealing oil obtained from the sealing oil supply oil sampling position and the moisture content and air content of the sealing oil obtained from the sealing oil replenishment oil sampling position, the removal efficiency of removing moisture and air in the sealing oil is determined.

4. The test system for measuring the substance content in sealing oil according to any one of claims 1 to 3, characterized in that: Also includes: a sealed oil pump having an inlet connected to the output end of the vacuum oil tank; A first valve having a first end connected to the outlet of the sealing oil pump, a second end of the first valve connected to the circulation port of the vacuum oil tank; and a third end of the first valve being the sealing oil supply and oil sampling position.

5. A method for controlling the content of a substance in a sealing oil, characterized in that: Applied to a sealing oil system, the sealing oil system includes: a vacuum pump, a vacuum gauge, a vacuum oil tank, and a generator; the method for controlling the substance content in the sealing oil includes: Determining a target air content and a target moisture content to be adjusted corresponding to the sealing oil in the vacuum oil tank; Finding the target vacuum pressure corresponding to the target air content and the target moisture content from the corresponding relationship between the preset vacuum pressure and the moisture content and air content of the sealing oil; adjusting the vacuum pump so that the vacuum pressure in the vacuum oil tank indicated by the vacuum gauge is the target vacuum pressure; Wherein, the corresponding relationship is obtained by a test system for measuring the substance content in the sealing oil according to any one of claims 1 to 4.

6. The method for controlling the substance content in sealing oil according to claim 5, characterized in that: The sealing oil in the vacuum oil tank in the sealing oil system is the same as the sealing oil in the vacuum oil tank in the test system for measuring the substance content in the sealing oil.

7. A device for controlling the content of a substance in sealing oil, characterized in that: Applicable to a sealing oil system, the sealing oil system comprises: a vacuum pump, a vacuum gauge, a vacuum oil tank, and a generator; the device comprises: A determination module, used to determine a target air content and a target moisture content to be adjusted corresponding to the sealing oil in the vacuum oil tank; A search module, used to search for a target vacuum pressure corresponding to the target air content and the target moisture content from a correspondence relationship between a preset vacuum pressure and the moisture content and air content of the sealing oil; A regulating module, configured to regulate the vacuum pump so that the vacuum pressure in the vacuum oil tank indicated by the vacuum gauge is the target vacuum pressure; Wherein, the corresponding relationship is obtained by a test system for measuring the substance content in the sealing oil according to any one of claims 1 to 4.

8. A computer program product, characterized in that It comprises computer-readable instructions, and when the computer-readable instructions are executed on an electronic device, the electronic device implements the method for controlling the content of a substance in sealing oil as claimed in any one of claims 5 to 6.

9. An electronic device, characterized in that: The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the electronic device can implement the method for controlling the substance content in the sealing oil as described in any one of claims 5 to 6.

10. A computer storage medium, characterized in that: The storage medium carries one or more computer programs, and when the one or more computer programs are executed by an electronic device, the electronic device can implement the method for controlling the substance content in the sealing oil as described in any one of claims 5 to 6.

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