CN116257943A - Nuclear turbine pressure parameter simulation method - Google Patents
Nuclear turbine pressure parameter simulation method Download PDFInfo
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- CN116257943A CN116257943A CN202211101787.1A CN202211101787A CN116257943A CN 116257943 A CN116257943 A CN 116257943A CN 202211101787 A CN202211101787 A CN 202211101787A CN 116257943 A CN116257943 A CN 116257943A
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Abstract
The invention discloses a method for simulating pressure parameters of a nuclear turbine, which comprises the following steps: in the process of the speed increase and the load increase of the nuclear turbine, original real data are subjected to discrete sampling, and a functional relation between the rotating speed and the load and a pressure real-time value of the nuclear turbine is obtained in a logical curve fitting mode; the method comprises the steps that data of a real starting process of a nuclear turbine are used as initial values for simulation of a simulator, the simulator obtains pressure disturbance values under different theoretical working conditions by controlling an adjusting valve, the pressure disturbance values are pressure fluctuation values corresponding to the same working condition, the pressure disturbance values and the associated pressure real values are overlapped to obtain pressure final values under the corresponding actual working conditions, and the pressure final values are used as data sources of a follow-up upper analysis server. The simulation method for the pressure parameters of the nuclear turbine integrates and corrects the real pressure parameters of the nuclear turbine, and is closer to the real pressure measuring point change trend.
Description
Technical Field
The invention relates to the technical field of turbine monitoring, in particular to a method for simulating pressure parameters of a nuclear turbine.
Background
The domestic scientific research institutions have researches on pressure simulation of the steam turbine, but most institutions establish mathematical models and transfer functions based on experimental platforms such as MATLAB or LABVIEW and the like to conduct computer analysis research, and the method belongs to the theoretical research level. The theoretical simulation of the pressure parameters is realized by adopting a mathematical model, and the deviation and the unauthenticity of the theoretical simulation of the pressure parameters and the actual operation parameters of the nuclear turbine exist to a certain extent, so that the deviation of the follow-up study can be increased.
The manufacturers at home and abroad such as ABB, siemens, GE, emerson and Mitsubishi of the power station control system also study the steam turbine simulation system, the realization of control logic on a hardware platform of the control system is favored, the simulation model is mostly realized through simple configuration, the rotation speed, the power and the valve management can be simulated, the correctness and the usability of the control logic of the steam turbine are verified through the simulation logic, and the power station control system belongs to functional verification and test purposes. The simulation of the type is severely limited, the simulation under a plurality of simple working conditions can be only carried out fixedly, the qualitative analysis is favored, the flexible combination is not realized, and the accuracy is not high.
The above disclosure of background art is only for aiding in understanding the inventive concept and technical solution of the present invention, and it does not necessarily belong to the prior art of the present patent application, nor does it necessarily give technical teaching; the above background should not be used to assess the novelty and creativity of the present application without explicit evidence that the above-mentioned content was disclosed prior to the filing date of the present patent application.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a simulation method for the pressure parameters of a nuclear turbine, which comprises the following specific technical scheme: a nuclear turbine pressure parameter simulation method comprises the following steps:
in the process of the speed increase and the load increase of the nuclear turbine, original real data are subjected to discrete sampling, and a functional relation between the rotating speed and the load and a pressure real-time value of the nuclear turbine is obtained in a logical curve fitting mode; the method comprises the steps that actual starting process data of a nuclear turbine are used as initial values for simulation of a simulator, the simulator obtains pressure disturbance values under different theoretical working conditions by controlling an adjusting valve, the pressure disturbance values are corresponding pressure fluctuation amounts under the same working condition, the pressure actual values and the pressure disturbance values which are related are overlapped to obtain final pressure values under the corresponding actual working conditions, and the final pressure values are used as data sources of a follow-up upper analysis server.
Further, if the pressure parameter simulated by the simulator exceeds the preset value in the pressure fluctuation within the set time period, the pressure disturbance value and the corresponding pressure real-time value are overlapped to obtain a corresponding pressure final value under the actual working condition; and if the pressure fluctuation of the pressure parameter simulated by the simulator does not exceed the preset value in the set time period, the pressure disturbance value is recorded as 0.
Further, the functional relationship between the rotational speed and the load of the nuclear turbine and the pressure real-time value is as follows:
P t ＝f(OS，FT)＝a﹡f 1 (OS)+b﹡f 2 (FT)
wherein P is t For the real-time value of the pressure, OS is the current rotation speed, FT is the current load, f 1 And f 2 For an empirically fitted function, a and b are constants.
Further, the pressure real-time values corresponding to the n adjacent time points are averaged and then are overlapped with the pressure disturbance value corresponding to the last time point to obtain the final pressure value corresponding to the last time point.
Further, the pressure real-time value comprises the front steam pressure of the first stage of the high-pressure cylinder, the steam pressure of the main steam valve, the steam pressure of the high-pressure cylinder, the internal pressure of the condenser and the steam inlet pressure of the low-pressure cylinder, and the nuclear turbine is provided with pressure parameter monitoring points at the air inlet positions of the main steam valve, the high-pressure cylinder, the condenser and the low-pressure cylinder.
Further, if the pressure fluctuation of the simulator at the front time point and the rear time point exceeds 1Mpa, the pressure disturbance value and the corresponding pressure real-time value are overlapped to obtain a corresponding pressure final value under the actual working condition.
Further, the rotational speed and load setting of the simulator when performing simulation are kept consistent with those of the nuclear turbine.
Furthermore, the simulator realizes pressure parameter simulation under bypass full-open, bypass full-closed or boiler feedwater working conditions by controlling the regulating valve.
Further, the working conditions simulated by the simulator comprise brake hanging, impact rotation, warm-up, rated rotation speed, speed rise and loading load.
Further, the simulator is based on a nuclear turbine DEH control system.
Compared with the prior art, the invention has the following advantages: based on the operation data of the steam turbine of the real nuclear power station, the simulation and the actual application are organically combined, a mathematical model is used as a simulation object, the real operation data is used as a simulation base, the real scene of the control simulation is integrated, and the accuracy of the final pressure parameter simulation is improved.
Drawings
FIG. 1 is a schematic diagram of a flow frame of a method for simulating pressure parameters of a nuclear turbine according to an embodiment of the invention;
FIG. 2 is a fitted function f in a method for simulating pressure parameters of a nuclear turbine according to an embodiment of the present invention 1 A schematic diagram of a graph;
FIG. 3 is a fitted function f in a method for simulating pressure parameters of a nuclear turbine according to an embodiment of the present invention 2 A schematic diagram of a graph;
FIG. 4 is a schematic diagram of a simulation interface of pressure parameters in a simulation method of pressure parameters of a nuclear turbine according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a pressure curve in a method for simulating pressure parameters of a nuclear turbine according to an embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
In one embodiment of the invention, a method for simulating a pressure parameter of a nuclear turbine is provided, comprising the following steps: in the process of the speed increase and the load increase of the nuclear turbine, original real data are subjected to discrete sampling, and a functional relation between the rotating speed and the load and a pressure real-time value of the nuclear turbine, namely a pressure conversion algorithm, is obtained in a logical curve fitting mode; the method comprises the steps that actual starting process data of a nuclear turbine are used as initial values for simulation of a simulator, the simulator is based on a nuclear turbine DEH control system, pressure disturbance values under different theoretical working conditions are obtained through controlling a regulating valve, the pressure disturbance values are pressure fluctuation amounts corresponding to the same working condition, the pressure real-time values and the pressure disturbance values which are related are overlapped to obtain pressure final values under the corresponding actual working conditions, and the pressure final values are used as data sources of a subsequent upper analysis server. It should be noted that the rotational speed and load settings of the simulator when performing the simulation are kept consistent with those of the nuclear turbine in real time.
If the pressure fluctuation of the pressure parameter simulated by the simulator exceeds a preset value in a set time period, the pressure disturbance value and the corresponding pressure real-time value are overlapped to obtain a corresponding pressure final value under the actual working condition; and if the pressure fluctuation of the pressure parameter simulated by the simulator does not exceed the preset value in the set time period, the pressure disturbance value is 0.
Referring to fig. 1, the pressure parameter simulated by the simulator has pressure fluctuation exceeding a preset value in a set period of time, and further specifically includes three situations, which all affect the pressure real-time value obtained by the pressure conversion algorithm. Wherein, three cases are as follows:
(1) Large pressure fluctuations: the peak-to-peak value of the maximum fluctuation of the pressure is more than 2Mpa;
(2) Step pressure fluctuation: at a certain moment, the pressure suddenly increases by an increment of >1Mpa;
(3) Irregular pressure fluctuations: sudden pressure changes, such as 0 at the moment, continuous increases, etc.;
the nuclear turbine adopts a program programmed by a discrete control system, the program is a classical starting curve so as to obtain corresponding real data, and according to the data, the functional relation between the rotating speed and the load of the nuclear turbine and the real pressure value is obtained as follows:
P t ＝f(OS，FT)＝a﹡f 1 (OS)+b﹡f 2 (FT)
wherein P is t For the real-time value of the pressure, OS is the current rotation speed, FT is the current load, f 1 And f 2 For an empirical fitting function, see fig. 2 and 3, a and b are constants, the a, b coefficients are typically chosen between 0.9-1.1, default a=1, b=1.
In a preferred embodiment, the pressure real-time values corresponding to the n adjacent time points are averaged and then are overlapped with the pressure disturbance value corresponding to the last time point to obtain the final pressure value corresponding to the last time point. For example, when n=4, the average value of the pressures at the first four times is calculated, and the pressure disturbance value is added, and the calculation formula is as follows:
P s ＝f(x)＝|x|
wherein P is f And x is the pressure disturbance value.
In one embodiment of the invention, the matching design is carried out according to a hard simulation model, and the complete process simulation test from the starting parameter setting, the flushing and the full load of the nuclear turbine is realized through a platform simulation and a simulation algorithm. The simulator is based on a domestic mainstream nuclear turbine DEH control system, and is designed in a targeted mode by combining actual parameters and use conditions of the model. The method mainly realizes the start control, grid connection control and various test operations of the steam turbine, and in the process of simulating the pressure parameter change, simulation data are transmitted to an upper server in a communication mode. The pressure parameter simulation interface is shown in fig. 4.
The pressure simulation function of the nuclear turbine is to simulate and control the turbine, namely, the whole process from the hanging gate, the flushing, the warming-up, the supercritical, up to the rated rotation speed and the rising and loading load of the turbine is simulated, and the pressure simulation function is realized by controlling the regulating valve, and meanwhile, the pressure simulation function has the protection logic function of preventing overspeed of the simulated turbine. In addition, the steam turbine operation parameter simulator also provides a parameter simulation function, is designed according to past operation experience values under corresponding rotation speed and load, and can simulate the variation trend of various parameters including various pressure parameters including main steam pressure parameters, steam pressure parameters of various important parts in the steam turbine and the like in the starting and turning process and after loading. Meanwhile, the simulator also provides a part of parameter change disturbance function, so that the simulation degree is higher and is closer to the actual working condition. The main steam pressure and the reheater pressure can be subjected to small fluctuation, large fluctuation, abrupt rise, abrupt decrease and other operations. The parameters are disturbed and simulated, so that the purpose of simulating the on-site parameter change is achieved.
According to the embodiment, based on a big data mode, pressure data of a plurality of nuclear turbines are collected, wherein the pressure data comprise pressure change conditions in the processes of warming, flushing, constant speed and on-load, and based on the change characteristics of each pressure measuring point under abnormal working conditions, algorithm induction is carried out, and a pressure parameter algorithm of a corresponding position is arranged.
The real-time pressure value comprises the front steam pressure of the first stage of the high-pressure cylinder, the steam pressure of the main steam valve, the steam pressure of the high-pressure cylinder, the internal pressure of the condenser and the steam inlet pressure of the low-pressure cylinder, the pressure parameter monitoring points are arranged at the positions of the main steam valve, the high-pressure cylinder, the condenser and the low-pressure cylinder, which are actually arranged in advance of the first stage of the high-pressure cylinder, of the nuclear turbine, and the pressure measuring points of the nuclear turbine are specifically arranged in the following table:
| sequence number | Name of the name | Measuring range | Unit (B) | Remarks |
| 1 | Front steam pressure of first stage of high pressure cylinder (end regulating 1) | 0-10 | |
|
| 2 | Front steam pressure of first stage of high pressure cylinder (end regulating 2) | 0-10 | Mpa | |
| 3 | Pressure of steam before first stage of high pressure cylinder (electric end 1) | 0-10 | Mpa | |
| 4 | Pressure of steam before first stage of high pressure cylinder (electric end 2) | 0-10 | |
|
| 5 | Main steam valve steam pressure (L) | 0-10 | Mpa | |
| 6 | Main steam valve steam pressure (R) | 0-10 | |
|
| 7 | High pressure cylinder exhaust pressure (electric end) | 0-2 | |
|
| 8 | High pressure cylinder exhaust pressure (end regulating) | 0-2 | Mpa | |
| 9 | Condenser #1 vacuum | 0-2 | |
|
| 10 | |
0-2 | |
|
| 11 | MSR A enters the pressure of inlet steam of low-pressure cylinder #1 | 0-10 | Mpa | |
| 12 | MSR A enters the pressure of the steam admission of the low- |
0-10 | Mpa | |
| 13 | MSR B inlet low pressure cylinder #1 inlet steam pressure | 0-10 | Mpa | |
| 14 | MSR B inlet low |
0-10 | Mpa |
The pressure design in the method for simulating the pressure parameters of the nuclear turbine adopts the actual starting process data of the nuclear power station as an initial value of simulation, and meanwhile, in the process of increasing speed and increasing load, the original actual data is subjected to discretization sampling, and the method is realized in a logical curve fitting mode. Referring to fig. 5, taking the main steam pressure and the main steam temperature as an example, the data is that the front section is the initial set value of 7.5Mpa, the stable state can be kept, the middle section selects small fluctuation, the upper limit value and the lower limit value of the fluctuation are set, the main steam pressure starts to small fluctuation, and the process loads the pressure and the temperature state of the main steam parameters relatively stable when the nuclear power station is started. In the state of small fluctuation of the main steam pressure, the high-pressure first-stage pressure starts to follow the fluctuation of the main steam pressure, so that the pressure transfer characteristic is also reflected, and objective facts are met. The initial value of the outlet pressure of the two MSRs is 7Mpa, and the two MSRs can be executed in the same setting mode as the main steam pressure according to actual conditions.
The simulation method for the pressure parameters of the nuclear turbine can be used for flexible pressure simulation configuration, and simulating pressure changes of different types and different working conditions; the multi-parameter association such as rotation speed, load, unit thermal state and the like can be carried out, and the method has strong universality; disturbance design input can be carried out, simulation analysis of abnormal working conditions, fault reproduction and the like can be realized.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present invention are directly or indirectly applied to other related technical fields, which are also included in the scope of the present invention.
Claims (10)
1. The method for simulating the pressure parameters of the nuclear turbine is characterized by comprising the following steps of:
in the process of the speed increase and the load increase of the nuclear turbine, original real data are subjected to discrete sampling, and a functional relation between the rotating speed and the load and a pressure real-time value of the nuclear turbine is obtained in a logical curve fitting mode; the method comprises the steps that actual starting process data of a nuclear turbine are used as initial values for simulation of a simulator, the simulator obtains pressure disturbance values under different theoretical working conditions by controlling an adjusting valve, the pressure disturbance values are corresponding pressure fluctuation amounts under the same working condition, the pressure actual values and the pressure disturbance values which are related are overlapped to obtain final pressure values under the corresponding actual working conditions, and the final pressure values are used as data sources of a follow-up upper analysis server.
2. The method for simulating the pressure parameters of the nuclear turbine according to claim 1, wherein if the pressure parameters simulated by the simulator have pressure fluctuation exceeding a preset value in a set period of time, the pressure disturbance value and the corresponding pressure real-time value are overlapped to obtain a corresponding pressure final value under the actual working condition; and if the pressure fluctuation of the pressure parameter simulated by the simulator does not exceed the preset value in the set time period, the pressure disturbance value is recorded as 0.
3. The method for simulating pressure parameters of a nuclear turbine according to claim 1, wherein the functional relationship between the rotational speed and load of the nuclear turbine and the real-time pressure value is as follows:
P t ＝f(OS，FT)＝a﹡f 1 (OS)+b﹡f 2 (FT)
wherein P is t For the real-time value of the pressure, OS is the current rotation speed, FT is the current load, f 1 And f 2 For an empirically fitted function, a and b are constants.
4. The method for simulating the pressure parameters of the nuclear turbine according to claim 1, wherein the pressure disturbance values corresponding to the last time point are overlapped after the pressure real-time values corresponding to the adjacent n time points are averaged to obtain the final pressure value corresponding to the last time point.
5. The method for simulating pressure parameters of a nuclear turbine according to claim 1, wherein the real-time pressure values include a high-pressure cylinder pre-stage steam pressure, a main steam valve steam pressure, a high-pressure cylinder exhaust pressure, a condenser internal pressure and a low-pressure cylinder inlet pressure, and the nuclear turbine is provided with pressure parameter monitoring points at the inlet positions of the high-pressure cylinder pre-stage, the main steam valve, the high-pressure cylinder, the condenser and the low-pressure cylinder.
6. The method for simulating the pressure parameters of the nuclear turbine according to claim 1, wherein if the pressure fluctuation of the simulator at the front and rear time points exceeds 1Mpa, the pressure disturbance value and the corresponding pressure real-time value are superimposed to obtain a corresponding pressure final value under the actual working condition.
7. The method for simulating pressure parameters of a nuclear turbine according to claim 1, wherein the rotational speed and load setting of the simulator when the simulator performs the simulation are consistent with the rotational speed and load setting of the nuclear turbine.
8. The method for simulating the pressure parameters of the nuclear turbine according to claim 1, wherein the simulator realizes the pressure parameter simulation under bypass full open, bypass full close or boiler feedwater working conditions by controlling the regulating valve.
9. The method for simulating pressure parameters of a nuclear turbine according to claim 8, wherein the working conditions simulated by the simulator comprise brake hanging, impact rotation, warm-up, rated rotation speed, speed increase and loading load.
10. The method for simulating pressure parameters of a nuclear turbine of claim 1, wherein the simulator is based on a DEH control system of the nuclear turbine.
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| CN117577953A (en) * | 2024-01-19 | 2024-02-20 | 北京海德利森科技有限公司 | Hot isostatic pressing process method and device applied to solid-state lithium battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117577953A (en) * | 2024-01-19 | 2024-02-20 | 北京海德利森科技有限公司 | Hot isostatic pressing process method and device applied to solid-state lithium battery |
| CN117577953B (en) * | 2024-01-19 | 2024-03-29 | 北京海德利森科技有限公司 | Hot isostatic pressing process method and device applied to solid-state lithium battery |
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