Water feed pump turbine lubricating oil system with stable and adjustable oil pressure

Abstract

The invention relates to the technical field of coal-fired power generation, and discloses a feed pump turbine lubricating oil system with stable and adjustable oil pressure, which comprises a lubricating oil mother pipe, a bypass pipe, an oil tank and an oil pump, the driving method for the oil pump comprises the steps that a first oil pressure demand characteristic is determined according to the first operation state of the feed pump turbine; determining a first driving strategy for driving the oil pump based on the first oil pressure demand characteristic, and driving the oil pump based on the first driving strategy; after a first preset time period after the oil pump is driven according to the first driving strategy, a second operation state of the water feeding pump turbine is obtained, the second operation state is analyzed, and a first difference characteristic between the second operation state and the predicted standard operation state is judged; and the first difference feature is substituted into an oil supply abnormity judgment model, the oil supply abnormity influence degree is determined, the first driving strategy is subjected to emergency correction based on the oil supply abnormity influence degree, and lubricating oil system faults are screened. According to the invention, stable oil pressure and safe operation of the system can be effectively ensured.

Description

Technical Field

[0001] The invention relates to the technical field of coal-fired power generation, and in particular to a feedwater pump turbine lubricating oil system with stable and adjustable oil pressure. Background Art

[0002] Existing power plants generally use small steam turbines to drive feedwater pumps. During the normal operation of the feedwater pump steam turbine unit, various faults often occur in the oil system, among which the fault of unit tripping due to reduced lubricating oil pressure has the greatest impact. The existing literature on the research on the causes of reduced lubricating oil pressure mainly focuses on equipment defects such as check valves and oil pumps and the application of accumulators installed in the system. However, there are relatively few related defect analysis and treatment such as oil pressure fluctuations during the pump cutting process of a relatively mature oil supply device.

[0003] In actual construction, the oil supply device of the feedwater pump turbine unit is often arranged nearby, that is, at the 8.6-meter level of the steam turbine room. However, due to conflicts between the plant area and the layout of other equipment such as high- and low-pressure heaters, some power plants choose to set the oil supply device at 0 meters from the machine room. For a system where an oil pump supplies lubricating oil and regulating oil at the same time, maintaining the stability of the lubricating oil and regulating oil pressure will be affected by many factors. Among them, the change in the layout position of the oil supply device will have a great impact on the stability of the system oil pressure (especially the lubricating oil pressure), resulting in repeated connection and restart of the system accident oil pump, affecting the safety of the system; the small operating opening of the lubricating oil regulating valve causes abnormal fluctuations in the lubricating oil pressure when the pump is cut, causing frequent connection and restart of the DC pump. At the same time, due to severe throttling, the noise on site is very loud.

[0004] Therefore, how to provide a feedwater pump turbine lubricating oil system with stable and adjustable system oil pressure and low noise is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a feedwater pump turbine lubricating oil system with stable and adjustable oil pressure to solve the technical problems of repeated restart of the system accident oil pump due to unstable system oil pressure and loud noise due to severe throttling.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure, comprising a lubricating oil main pipe and a bypass pipe for oil supply, an oil tank and an oil pump which are sequentially connected to the lubricating oil main pipe, and the oil pump delivers lubricating oil to the steam turbine; wherein a method for driving the oil pump comprises: determining a first oil pressure demand characteristic according to a first operating state of the feedwater pump steam turbine and based on the first operating state;

[0008] Determining a first driving strategy for driving the oil pump based on the first oil pressure demand characteristic, and driving the oil pump based on the first driving strategy;

[0009] After a first preset time period after the oil pump is driven according to the first driving strategy, a second operating state of the feedwater pump turbine is obtained, and the second operating state is analyzed to determine a first difference feature between the second operating state and the predicted standard operating state;

[0010] Performing data screening and classification on the second difference characteristics of past records, classifying the difference characteristics that meet the first classification conditions, and analyzing and configuring the impact degree of abnormal fuel supply in the classified difference characteristics;

[0011] A fuel supply abnormality judgment model is constructed based on the classified difference characteristics and the corresponding fuel supply abnormality impact degree;

[0012] The first difference feature is substituted into the oil supply abnormality judgment model to determine the impact degree of the oil supply abnormality, and based on the impact degree of the oil supply abnormality, the first driving strategy is urgently corrected and the lubricating oil system fault is screened.

[0013] Preferably, in the above feedwater pump turbine lubricating oil system with stable and adjustable oil pressure, the determining of the first oil pressure demand characteristic based on the first operating state includes:

[0014] A correspondence relationship between oil pressure demand characteristics and parameter intervals is preset, wherein each oil pressure demand characteristic of the feedwater pump turbine is associated with operating parameter intervals of several different operating parameters;

[0015] A plurality of first operating parameters of the first operating state of the feedwater pump turbine are obtained, and based on a mapping relationship between an operating parameter interval to which each first operating parameter belongs and within the oil pressure demand characteristic-parameter interval correspondence, the current oil pressure demand characteristic of the feedwater pump turbine is determined.

[0016] Preferably, in the above-mentioned feedwater pump turbine lubricating oil system with stable and adjustable oil pressure, the method for determining the first difference characteristic between the second operating state and the predicted standard operating state includes:

[0017] Acquire a plurality of first operating parameters of a first operating state of the feedwater pump steam turbine, and determine a standard operating state corresponding to the feedwater pump steam turbine at this time based on the overall performance state of the plurality of first operating parameters;

[0018] A plurality of second operating parameters of the second operating state are compared and analyzed with a plurality of standard operating parameters of the standard operating state to obtain a plurality of first parameter differences.

[0019] Preferably, in the above feedwater pump turbine lubricating oil system with stable and adjustable oil pressure, the method for constructing the oil supply abnormality judgment model includes:

[0020] A fuel supply abnormality data group is preset, and the fuel supply abnormality data group includes a plurality of fuel supply abnormality parameter difference intervals;

[0021] Comparing each parameter difference in the second difference feature with a corresponding fuel supply abnormality parameter difference interval in the fuel supply abnormality data group, and determining a first degree of proximity between each parameter difference and the corresponding fuel supply abnormality parameter difference interval;

[0022] Based on the first degree of proximity of the differences between the different parameters, a second degree of proximity of the second difference feature to the fuel supply abnormality data set is determined, and based on the second degree of proximity, the second difference feature is classified.

[0023] Preferably, in the above feedwater pump turbine lubricating oil system with stable and adjustable oil pressure, the expression for calculating the second degree of proximity of the second difference feature to the oil supply abnormality data group is:

[0024]

[0025] Wherein, j2 is the second closeness of the second difference feature to the fuel supply abnormality data group, k n is the weight coefficient of the nth parameter difference in the second difference feature, c n is the nth parameter difference, c n-sb is the upper boundary value of the difference interval of the nth abnormal fuel supply parameter, c n-xb is the lower boundary value of the nth fuel supply abnormality parameter difference interval, and & means or.

[0026] Preferably, in the above feedwater pump turbine lubricating oil system with stable and adjustable oil pressure, the second difference characteristics are classified and analyzed and configured based on the second proximity;

[0027] A corresponding relationship between the proximity degree and the oil pressure parameter interval of the driving oil pump is preset, wherein the corresponding relationship between the proximity degree and the oil pressure parameter of the driving oil pump is associated with a number of different oil pressure parameter intervals of the driving oil pump for each difference feature relative to the degree of proximity of the oil supply abnormality data group;

[0028] Obtain a second degree of proximity of the second difference feature to the oil supply abnormality data group, and determine the oil pressure demand characteristic of the current driving oil pump of the feedwater pump turbine based on a mapping relationship between the degree of proximity of each difference feature to the oil supply abnormality data group and the corresponding relationship between the degree of proximity and the oil pressure parameter interval of the driving oil pump.

[0029] Preferably, in the above feedwater pump turbine lubricating oil system with stable and adjustable oil pressure, the method for emergency correction of the first driving strategy includes:

[0030] Acquire a plurality of first parameter differences of the first difference feature, compare them with the corresponding fuel supply abnormality parameter difference intervals in the fuel supply abnormality data group, and determine a third degree of proximity between each parameter difference and the corresponding fuel supply abnormality parameter difference interval;

[0031] Determining a fourth degree of closeness of the first difference feature to the fuel supply abnormality data group based on a third degree of closeness of the differences of the different parameters;

[0032] Determine the second oil pressure demand characteristic of the current driving oil pump of the feedwater pump steam turbine based on the mapping relationship between the fourth proximity degree of the first difference characteristic and the corresponding relationship between the proximity degree and the oil pressure parameter interval of the driving oil pump;

[0033] Comparing and analyzing the second oil pressure demand characteristic with the first oil pressure demand characteristic to generate a judgment result;

[0034] The first driving strategy is urgently corrected according to the judgment result.

[0035] Preferably, in the above feedwater pump turbine lubricating oil system with stable and adjustable oil pressure, the emergency correction of the first driving strategy according to the judgment result includes:

[0036] An oil pressure demand characteristic data group is preset, and the oil pressure demand characteristic data group includes a plurality of oil pressure demand characteristic difference intervals, and the plurality of oil pressure demand characteristic difference intervals include an oil pressure demand characteristic difference interval that meets a first classification condition;

[0037] If the difference between the second oil pressure demand characteristic and the first oil pressure demand characteristic is within the oil pressure demand characteristic difference interval that satisfies the first classification condition, the result of the judgment is that the operation is normal, and the opening of the first regulating valve on the lubricating oil main pipe is adjusted according to the second oil pressure demand characteristic, and the first regulating valve is a self-operated regulating valve;

[0038] If the difference between the second oil pressure demand characteristic and the first oil pressure demand characteristic is outside the oil pressure demand characteristic difference range that satisfies the first classification condition, the result is judged as abnormal operation, and the bypass pipe is opened according to the second oil pressure demand characteristic.

[0039] Preferably, in the above feedwater pump turbine lubricating oil system with stable and adjustable oil pressure, the method of opening the bypass pipe according to the second oil pressure demand characteristic comprises:

[0040] Acquire the starting oil pressure of the bypass pipe, and open the bypass pipe based on the starting oil pressure;

[0041] The opening of the second regulating valve on the bypass pipe is calculated based on the difference between the second oil pressure demand characteristic and the first oil pressure demand characteristic, and the second regulating valve is a needle-type regulating valve.

[0042] The present invention provides a feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure. Compared with the prior art, the present invention has the following beneficial effects:

[0043] (1) The feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure of the present invention determines the first driving strategy through the first oil pressure demand characteristic, drives the oil pump based on the first driving strategy, and then compares and analyzes the second oil pressure demand characteristic with the first oil pressure demand characteristic to generate a judgment result, and makes an emergency correction to the first driving strategy according to the judgment result, so as to quickly and accurately judge the oil pressure demand characteristic of the system, and adjust the opening of the regulating valve on the lubricating oil main pipe or bypass pipe according to the oil pressure demand characteristic, so as to quickly adjust the oil pressure of the feedwater pump steam turbine lubricating oil system, ensure the oil pressure stability of the feedwater pump steam turbine lubricating oil system and the continuous and stable operation of the feedwater pump steam turbine lubricating oil system, solve the problem of repeated connection and starting of the oil pump in the system accident, and improve the safety performance of the system;

[0044] (2) The lubricating oil system of the feedwater pump turbine with stable and adjustable oil pressure of the present invention is provided with a bypass pipe, which can effectively increase the adjustable range of the oil pressure, increase the pressure after the valve, significantly improve the regulating performance, reduce the throttling problem of the system, and also reduce the spring compression amount, effectively reducing the sharp noise on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 It is a schematic diagram of the lubricating oil system of the feedwater pump steam turbine with stable and adjustable oil pressure of the present invention;

[0047] Figure 2 The present invention is a schematic flow chart of a feedwater pump steam turbine lubricating oil system driving an oil pump with stable and adjustable oil pressure.

[0048] In the figure, 1, oil tank; 2, oil pump; 3, lubricating oil main pipe; 4, first regulating valve; 5, bypass pipe; 6, second regulating valve. DETAILED DESCRIPTION

[0049] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0050] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] like Figure 1 As shown, the present invention provides a feedwater pump turbine lubricating oil system with stable and adjustable oil pressure, comprising a lubricating oil main pipe 3 and a bypass pipe 5 for oil supply, an oil tank 1 and an oil pump 2 which are sequentially connected to the lubricating oil main pipe 3, wherein the oil pump 2 transports lubricating oil to the turbine.

[0054] In some embodiments of the present invention, a first regulating valve 4 is further provided on the lubricating oil main pipe 3, and a second regulating valve 6 is further provided on the bypass pipe 5, wherein the first regulating valve 4 is a self-operated regulating valve, and the second regulating valve 6 is a needle-type regulating valve. When the oil pump is repeatedly started and operated and cannot be stopped, the bypass pipe 5 is opened by adjusting the second regulating valve 6 to increase the pressure after the valve and the oil pressure adjustment range of the system, thereby ensuring the oil pressure stability of the system, reducing the problem of repeated starting of the accident oil pump, and improving the safety of the operation of the feedwater pump turbine unit.

[0055] like Figure 2 As shown, the driving method of the oil pump of the lubricating oil system of the feedwater pump turbine with stable and adjustable oil pressure of the present invention comprises:

[0056] S100: According to the first operating state of the feedwater pump turbine, and based on the first operating state, determine the first oil pressure demand characteristic, wherein the first operating state includes a plurality of first operating parameters. By acquiring the plurality of first operating parameters and judging the operating parameter interval to which they belong, the accurate first oil pressure demand characteristic is determined, and the calculation efficiency is fast and accurate.

[0057] S200: Determine a first driving strategy for driving the oil pump based on the first oil pressure demand characteristic, and drive the oil pump based on the first driving strategy, that is, drive the oil pump through the actuator under the action of the signal of the first driving strategy to improve fuel efficiency.

[0058] S300: After the oil pump is driven according to the first driving strategy for a first preset time period, the second operating state of the feedwater pump turbine is obtained, and the second operating state is analyzed to determine the first difference feature between the second operating state and the predicted standard operating state, wherein the second operating state includes a number of second operating parameters, and the predicted standard operating state includes a number of standard operating parameters. By comparing the second operating parameters with the standard operating parameters and calculating the difference to obtain the first difference feature, a more reliable inspection result can be obtained.

[0059] S400: Data screening and classification of the second difference characteristics of past records can greatly improve the efficiency of data analysis, discover the patterns in the data, classify the difference characteristics that meet the first classification conditions, and analyze and configure the degree of impact of fuel supply abnormalities in the classified difference characteristics, which helps to improve the calculation efficiency of the system and quickly and accurately obtain the degree of impact of fuel supply abnormalities, thereby helping to improve the efficiency of system operation and ensure the safe operation of the system.

[0060] S500: Building a fuel supply abnormality judgment model based on the classified difference characteristics and the corresponding fuel supply abnormality impact degree is crucial to ensuring the normal operation of the system and discovering potential problems in advance. It has high accuracy and fast data processing speed, realizes intelligent monitoring of the system, and improves the operating efficiency and safety of the system.

[0061] S600: Substitute the first difference feature into the oil supply abnormality judgment model to determine the impact of the oil supply abnormality, and based on the impact of the oil supply abnormality, urgently correct the first driving strategy and screen the lubricating oil system faults. That is, through real-time analysis of the system oil supply abnormality and timely adjustment of the driving strategy, the abnormal operation of the system can be effectively avoided to ensure its stable and safe operation, and the additional costs caused by the oil supply abnormality can be avoided, which has obvious economic benefits.

[0062] In some embodiments of the present invention, determining the first oil pressure requirement characteristic based on the first operating state in step S100 includes:

[0063] S101: a correspondence relationship between oil pressure demand characteristics and parameter intervals is preset. For each oil pressure demand characteristic of the feedwater pump turbine, the correspondence relationship between oil pressure demand characteristics and parameter intervals is associated with several operating parameter intervals of different operating parameters, which is beneficial to improving calculation efficiency, reducing errors, and ensuring stable operation of the system;

[0064] S102: Acquire several first operating parameters of the first operating state of the feedwater pump turbine, and determine the current oil pressure demand characteristics of the feedwater pump turbine based on the mapping relationship between the operating parameter interval to which each first operating parameter belongs and the oil pressure demand characteristics-parameter interval correspondence relationship, which can effectively remove useless or redundant characteristics, thereby improving the accuracy of system calculations.

[0065] In some embodiments of the present invention, the method of determining the first difference feature between the second operating state and the predicted standard operating state in step S300 includes:

[0066] S301: Acquire a plurality of first operating parameters of a first operating state of a feedwater pump steam turbine, and determine a corresponding standard operating state of the feedwater pump steam turbine at this time based on the overall performance state of the plurality of first operating parameters;

[0067] S302: Compare and analyze a plurality of second operating parameters of the second operating state with a plurality of standard operating parameters of the standard operating state to obtain a plurality of first parameter differences, which helps to improve the stability and efficiency of system judgment.

[0068] In some embodiments of the present invention, the method of constructing the fuel supply abnormality judgment model in step S500 includes:

[0069] S501: A fuel supply abnormality data group is preset, and the fuel supply abnormality data group includes a plurality of fuel supply abnormality parameter difference intervals, which helps to improve the stability and accuracy of the system in judging fuel supply abnormality;

[0070] S502: Compare each parameter difference in the second difference feature with the corresponding fuel supply abnormality parameter difference interval in the fuel supply abnormality data group, and determine a first degree of proximity between each parameter difference and the corresponding fuel supply abnormality parameter difference interval;

[0071] S503: Determine a second degree of proximity of the second difference feature to the fuel supply abnormality data set based on the first degree of proximity of the different parameter differences, and classify the second difference feature based on the second degree of proximity.

[0072] In some embodiments of the present invention, the expression for calculating the second degree of proximity of the second difference feature to the fuel supply abnormality data set in step S503 is:

[0073]

[0074] Among them, j 2 k is the second closeness of the second difference feature to the fuel supply abnormality data set, n is the weight coefficient of the nth parameter difference in the second difference feature, c n is the nth parameter difference, c n-sb is the upper boundary value of the difference interval of the nth abnormal fuel supply parameter, c n-xb is the lower boundary value of the nth fuel supply abnormality parameter difference interval, and & means or.

[0075] In some embodiments of the present invention, the method of classifying and analyzing the second difference features based on the second proximity in step S503 includes:

[0076] S504: a correspondence relationship between the proximity degree and the oil pressure parameter interval of the driving oil pump is preset. The correspondence relationship between the proximity degree and the oil pressure parameter of the driving oil pump is associated with a number of different oil pressure parameter intervals of the driving oil pump for the proximity degree of each difference feature relative to the oil supply abnormality data group, which helps to improve the efficiency of system calculation and operation;

[0077] S505: Obtain a second degree of proximity of the second difference feature to the oil supply abnormality data group, and determine the oil pressure demand characteristics of the current driving oil pump of the feedwater pump turbine based on a mapping relationship between the degree of proximity of each difference feature to the oil supply abnormality data group and the oil pressure parameter interval corresponding to the proximity degree of the driving oil pump.

[0078] In some embodiments of the present invention, the method of urgently correcting the first driving strategy in step S600 includes:

[0079] S601: obtaining a plurality of first parameter differences of the first difference feature, comparing them with corresponding fuel supply abnormality parameter difference intervals in the fuel supply abnormality data group, and determining a third degree of proximity between each parameter difference and the corresponding fuel supply abnormality parameter difference interval;

[0080] S602: Determine a fourth degree of closeness of the first difference feature to the fuel supply abnormality data group based on a third degree of closeness of the differences of the different parameters;

[0081] S603: determining a second oil pressure demand characteristic of the current driving oil pump of the feedwater pump steam turbine based on a mapping relationship between the fourth proximity of the first difference characteristic and the corresponding relationship between the proximity and the oil pressure parameter range of the driving oil pump;

[0082] S604: Compare and analyze the second oil pressure demand characteristic with the first oil pressure demand characteristic to generate a judgment result;

[0083] S605: Emergency correction is performed on the first driving strategy according to the determination result.

[0084] In some embodiments of the present invention, the first driving strategy is urgently modified according to the judgment result, including: a set of oil pressure demand characteristic data is preset, and the set of oil pressure demand characteristic data includes a plurality of oil pressure demand characteristic difference intervals, and the plurality of oil pressure demand characteristic difference intervals include an oil pressure demand characteristic difference interval that meets the first classification condition;

[0085] If the difference between the second oil pressure demand characteristic and the first oil pressure demand characteristic is within the oil pressure demand characteristic difference range that meets the first classification condition, the judgment result is that the operation is normal, and the opening of the first regulating valve on the lubricating oil main pipe is adjusted according to the second oil pressure demand characteristic to adjust the pressure after the valve, wherein the first regulating valve is a self-operated regulating valve, and its actuator is a smaller piston type with a diameter of 40mm and a throat diameter of DN40mm, which can better match the flow rate and improve the regulation performance of the system;

[0086] If the difference between the second oil pressure demand characteristic and the first oil pressure demand characteristic is outside the oil pressure demand characteristic difference range that meets the first classification condition, the judgment result is abnormal operation, and the bypass pipe is opened according to the second oil pressure demand characteristic to increase the pressure after the valve to ensure stable operation of the system.

[0087] In some embodiments of the present invention, the method of opening the bypass pipe according to the second oil pressure demand characteristic includes: obtaining the starting oil pressure of the bypass pipe, and opening the bypass pipe based on the starting oil pressure;

[0088] Based on the difference between the second oil pressure demand characteristic and the first oil pressure demand characteristic, the opening of the second regulating valve on the bypass pipe is calculated to adjust the pressure after the valve. The second regulating valve is a needle-type regulating valve with a diameter of DN10mm, which can optimize the regulation linearity and significantly improve the regulation performance of the regulating valve, thereby ensuring the stable operation of the system.

[0089] The working principle of the above-mentioned feedwater pump turbine lubricating oil system with stable and adjustable oil pressure is as follows: first, the second difference characteristics of the past records are screened and classified, and an oil supply abnormality judgment model is constructed based on the classified difference characteristics and the corresponding oil supply abnormality impact degree. When in use, the first oil pressure demand characteristic is determined according to the first operating state of the feedwater pump turbine, and the first driving strategy for driving the oil pump is determined according to the first oil pressure demand characteristic, and the oil pump is driven based on the first driving strategy. Then, the second operating state of the feedwater pump turbine is obtained and data analysis and comparison are performed to make emergency corrections to the first driving strategy, effectively solving the problems of unstable oil pressure in the existing system, which easily leads to repeated starting of the accident oil pump, and loud noise due to severe throttling.

[0090] In some embodiments of the present invention, when the difference between the second oil pressure demand characteristic and the first oil pressure demand characteristic is within the oil pressure demand characteristic difference interval that satisfies the first classification condition, it is only necessary to increase the opening of the first regulating valve to increase the valve post-valve pressure of the lubricating oil main pipe; when the difference between the second oil pressure demand characteristic and the first oil pressure demand characteristic is outside the oil pressure demand characteristic difference interval that satisfies the first classification condition, it is necessary to open the second regulating valve on the bypass pipe to increase the valve post-valve pressure, thereby solving the problem of unstable system oil pressure and easy to cause repeated starting of the accident oil pump. It can not only increase the adjustable range of the oil pressure, but also reduce the compression of the spring and the noise on site, effectively ensuring the safe and stable operation of the feedwater pump turbine unit.

[0091] It can be seen from the above embodiments that the present invention provides a feedwater pump turbine lubricating oil system with stable and adjustable oil pressure.

[0092] In summary, the feedwater pump turbine lubricating oil system with stable and adjustable oil pressure of the present invention can not only reduce the throttling problem of the system and significantly improve the sharp noise on site, but also ensure the stability of the oil pressure of the feedwater pump turbine and increase the adjustable range of the oil pressure. According to the current operating status obtained and the analysis of the operating status, the first driving strategy of the driving oil pump is corrected, and the lubricating oil system faults are screened, thereby improving the safety of the operation of the feedwater pump turbine unit and ensuring the normal and stable operation of the feedwater pump turbine lubricating oil system.

[0093] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0094] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure, comprising: A lubricating oil main pipe and a bypass pipe for oil supply, an oil tank and an oil pump which are sequentially connected to the lubricating oil main pipe, the oil pump conveys lubricating oil to the steam turbine, and the method for driving the oil pump includes: According to and based on a first operating state of the feedwater pump turbine, a first oil pressure demand characteristic is determined; Determining a first driving strategy for driving the oil pump based on the first oil pressure demand characteristic, and driving the oil pump based on the first driving strategy; After a first preset time period after the oil pump is driven according to the first driving strategy, a second operating state of the feedwater pump turbine is obtained, and the second operating state is analyzed to determine a first difference feature between the second operating state and the predicted standard operating state; Performing data screening and classification on the second difference characteristics of past records, classifying the difference characteristics that meet the first classification conditions, and analyzing and configuring the impact degree of abnormal fuel supply in the classified difference characteristics; A fuel supply abnormality judgment model is constructed based on the classified difference characteristics and the corresponding fuel supply abnormality impact degree; The first difference feature is substituted into the oil supply abnormality judgment model to determine the impact degree of the oil supply abnormality, and based on the impact degree of the oil supply abnormality, the first driving strategy is urgently corrected and the lubricating oil system fault is screened.

2. The feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure according to claim 1 is characterized in that: The determining of the first oil pressure requirement characteristic based on the first operating state includes: A correspondence relationship between oil pressure demand characteristics and parameter intervals is preset, wherein each oil pressure demand characteristic of the feedwater pump turbine is associated with operating parameter intervals of several different operating parameters; A plurality of first operating parameters of the first operating state of the feedwater pump turbine are obtained, and based on a mapping relationship between an operating parameter interval to which each first operating parameter belongs and within the oil pressure demand characteristic-parameter interval correspondence, the current oil pressure demand characteristic of the feedwater pump turbine is determined.

3. The feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure according to claim 1, characterized in that: The method for determining the first difference feature between the second operating state and the predicted standard operating state includes: Acquire a plurality of first operating parameters of a first operating state of the feedwater pump steam turbine, and determine a standard operating state corresponding to the feedwater pump steam turbine at this time based on the overall performance state of the plurality of first operating parameters; A plurality of second operating parameters of the second operating state are compared and analyzed with a plurality of standard operating parameters of the standard operating state to obtain a plurality of first parameter differences.

4. The feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure according to claim 1, characterized in that: The method for constructing the fuel supply abnormality judgment model comprises: A fuel supply abnormality data group is preset, and the fuel supply abnormality data group includes a plurality of fuel supply abnormality parameter difference intervals; Comparing each parameter difference in the second difference feature with a corresponding fuel supply abnormality parameter difference interval in the fuel supply abnormality data group, and determining a first degree of proximity between each parameter difference and the corresponding fuel supply abnormality parameter difference interval; Based on the first degree of proximity of the differences between the different parameters, a second degree of proximity of the second difference feature to the fuel supply abnormality data set is determined, and based on the second degree of proximity, the second difference feature is classified.

5. The feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure according to claim 4 is characterized in that: The expression for calculating the second degree of proximity of the second difference feature to the fuel supply abnormality data group is: Wherein, j2 is the second closeness of the second difference feature to the fuel supply abnormality data group, k n is the weight coefficient of the nth parameter difference in the second difference feature, c n is the nth parameter difference, c n-sb is the upper boundary value of the difference interval of the nth abnormal fuel supply parameter, c n-xb is the lower boundary value of the nth abnormal fuel supply parameter difference interval, and & means or.

6. The feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure according to claim 4 is characterized in that: Based on the second proximity, classifying and analyzing the configuration of the second difference features; A correspondence relationship between the proximity degree and the oil pressure parameter interval of the driving oil pump is preset, wherein the correspondence relationship between the proximity degree and the oil pressure parameter of the driving oil pump is associated with a number of different oil pressure parameter intervals of the driving oil pump for each difference feature relative to the degree of proximity of the oil supply abnormality data group; Obtain a second degree of proximity of the second difference feature to the oil supply abnormality data group, and determine the oil pressure demand characteristic of the current driving oil pump of the feedwater pump turbine based on a mapping relationship between the degree of proximity of each difference feature to the oil supply abnormality data group and the corresponding relationship between the degree of proximity and the oil pressure parameter interval of the driving oil pump.

7. The feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure according to claim 1, characterized in that: The method for urgently correcting the first driving strategy comprises: Acquire a plurality of first parameter differences of the first difference feature, compare them with the corresponding fuel supply abnormality parameter difference intervals in the fuel supply abnormality data group, and determine a third degree of proximity between each parameter difference and the corresponding fuel supply abnormality parameter difference interval; Determining a fourth degree of closeness of the first difference feature to the fuel supply abnormality data group based on a third degree of closeness of the differences of the different parameters; Determine the second oil pressure demand characteristic of the current driving oil pump of the feedwater pump steam turbine based on the mapping relationship between the fourth proximity degree of the first difference characteristic and the corresponding relationship between the proximity degree and the oil pressure parameter interval of the driving oil pump; Comparing and analyzing the second oil pressure demand characteristic with the first oil pressure demand characteristic to generate a judgment result; The first driving strategy is urgently corrected according to the judgment result.

8. The feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure according to claim 7, characterized in that: The emergency correction of the first driving strategy according to the judgment result includes: An oil pressure demand characteristic data group is preset, and the oil pressure demand characteristic data group includes a plurality of oil pressure demand characteristic difference intervals, and the plurality of oil pressure demand characteristic difference intervals include an oil pressure demand characteristic difference interval that meets a first classification condition; If the difference between the second oil pressure demand characteristic and the first oil pressure demand characteristic is within the oil pressure demand characteristic difference interval that satisfies the first classification condition, the result of the judgment is that the operation is normal, and the opening of the first regulating valve on the lubricating oil main pipe is adjusted according to the second oil pressure demand characteristic, and the first regulating valve is a self-operated regulating valve; If the difference between the second oil pressure demand characteristic and the first oil pressure demand characteristic is outside the oil pressure demand characteristic difference range that satisfies the first classification condition, the result is judged as abnormal operation, and the bypass pipe is opened according to the second oil pressure demand characteristic.

9. The feedwater pump steam turbine lubricating oil system with stable and adjustable oil pressure according to claim 8, characterized in that: The method for opening the bypass pipe according to the second oil pressure demand characteristic comprises: Acquire the starting oil pressure of the bypass pipe, and open the bypass pipe based on the starting oil pressure; The opening of the second regulating valve on the bypass pipe is calculated based on the difference between the second oil pressure demand characteristic and the first oil pressure demand characteristic, and the second regulating valve is a needle-type regulating valve.

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