CN114817835B - Real-time calculation method for three-level overrun safety risk of main steam pipeline pressure - Google Patents
Real-time calculation method for three-level overrun safety risk of main steam pipeline pressure Download PDFInfo
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Abstract
The invention discloses a real-time calculation method of a three-level overrun safety risk of main steam pipeline pressure, which comprises the following steps: according to the previous time t of each main steam pressure measuring point i‑1 Is the kth stage overpressure state S Bk (t i‑1 ) Each main steam pressure measuring point is at the current time t i Is the kth stage overpressure state S Bk (t i ) Judging whether the k-th overpressure occurs or not; when the kth level overpressure occurs, calculating the current time t according to the time when the kth level overpressure occurs i Real-time overpressure safety risk value R of each main steam pressure measuring point jk (t i ) The method comprises the steps of carrying out a first treatment on the surface of the According to the current time t i Real-time overpressure safety risk value R of each main steam pressure measuring point jk (t i ) Calculating an accumulated overpressure safety risk value R from each main steam pressure measuring point to the moment of calculation j The method comprises the steps of carrying out a first treatment on the surface of the Based on the accumulated overpressure safety risk value R from each main steam pressure measuring point to the moment of calculation j The method calculates the accumulated overpressure safety risk value R of the main steam pipeline until the calculation time, and calculates the three-level overrun safety risk of the pressure of the main steam pipeline in real time.
Description
Technical Field
The invention belongs to the technical field of thermal power generation industry, and relates to a real-time calculation method of a main steam pipeline pressure three-level overrun safety risk.
Background
The main steam system of thermal power plant is to send the steam generated by boiler into steam turbine to do work, and it is composed of main steam pipeline from outlet header of boiler superheater to inlet main steam valve of steam turbine, valve and drainage device. The main steam pipeline is the most important part, and the importance of the main steam pipeline is self-evident as one of four pipelines of a thermal power plant.
Because the main steam pressure value of the thermal generator set is often hundreds times of the atmospheric pressure, such as a super supercritical set, the main steam pressure value can reach 27MPa (270 times of the atmospheric pressure), and the main steam pipeline is designed into a large-size thick-wall part in consideration of safety, a design yard, a boiler and a steam machine manufacturer can also synthesize various design working conditions to provide proper design operation pressure, but the operation working condition is bad due to unstable factors in the service process, so that the main steam pipeline is in overpressure operation. The main steam pressure brings axial and circumferential internal pressure stress to the main steam pipeline, particularly when in overpressure operation, the ageing of pipeline materials can be accelerated under high-temperature environment and large internal pressure stress environment, and when the pipeline is in the condition of stress concentration caused by pipe defects, residual stress caused by welding and tiny crack defects, frequent overpressure operation even with large overpressure operation can amplify stress concentration or initiate tiny crack expansion to cause failure accidents, so that overpressure operation monitoring and even multistage overpressure operation monitoring of the main steam pipeline are necessary and important.
Therefore, based on three-level overpressure, the real-time calculation method of the three-level overrun safety risk of the main steam pipeline is provided, the overpressure condition of the main steam pipeline is represented by the three-level overrun safety risk value of the pressure, the operation condition of the main steam pressure is conveniently and particularly focused by operators, the technical supervision of the main steam pipeline is facilitated to be enhanced by production management professionals, and a reference is provided for the maintainer to purposefully make a maintenance plan.
At present, only literature reports and uses ANSYS finite element software numerical simulation to provide an equivalent stress mathematical model of a main steam pipeline bent pipe dangerous point, such as literature ' main steam pipeline life prediction based on reliability theory ', 2008, north China electric university (Beijing) '; there are also reports of analysis of the design pressure specification of the main steam pipeline of the supercritical unit currently used in China, and the working pressure under the working condition of the maximum continuous evaporation capacity (BMCR) of the boiler is adopted as the design pressure, such as the design pressure specification of the main steam pipeline of the supercritical unit, 2010 (08). However, a real-time calculation method aiming at the three-level overrun safety risk of the main steam pipeline pressure of the thermal power plant is not reported.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a real-time calculation method for the three-level overrun safety risk of the pressure of a main steam pipeline, which can calculate the three-level overrun safety risk of the pressure of the main steam pipeline in real time.
In order to achieve the above purpose, the real-time calculation method of the main steam pipeline pressure three-level overrun safety risk comprises the following steps:
1) Real-time grid-connected switch of unit and real-time generation power of unit at current time t i Is a value KG (t) i ) MW (t) i ) Calculating the current time t i Set operation state S of (2) A (t i ) The method comprises the steps of carrying out a first treatment on the surface of the Acquiring a real-time grid-connected switch of a unit and real-time generation power of the unit at a previous time t i-1 Is a value KG (t) i-1 ) MW (t) i-1 ) Calculate the previous time t i-1 Set operation state S of (2) A (t i-1 )；
When (S) A (t i )+S A (t i-1 ) 1), and then turning to the step 2);
2) Acquiring each main steam pressure measuring point at the previous time t i-1 Numerical MSP of (2) j (t i-1 ) Calculation ofThe time t before each main steam pressure measuring point i-1 Is the kth stage overpressure state S Bk (t i-1 ) The method comprises the steps of carrying out a first treatment on the surface of the Acquiring the current time t of each main steam pressure measuring point i Numerical MSP of (2) j (t i ) Calculating the current time t of each main steam pressure measuring point i Is the kth stage overpressure state S Bk (t i )；
3) According to the previous time t of each main steam pressure measuring point i-1 Is the kth stage overpressure state S Bk (t i-1 ) Each main steam pressure measuring point is at the current time t i Is the kth stage overpressure state S Bk (t i ) Judging whether the k-th overpressure occurs or not;
4) When the kth level overpressure occurs, calculating the current time t according to the time when the kth level overpressure occurs i Real-time overpressure safety risk value R of each main steam pressure measuring point jk (t i )；
5) According to the current time t i Real-time overpressure safety risk value R of each main steam pressure measuring point jk (t i ) Calculating an accumulated overpressure safety risk value R from each main steam pressure measuring point to the moment of calculation j ；
6) Based on the accumulated overpressure safety risk value R from each main steam pressure measuring point to the moment of calculation j And calculating an accumulated overpressure safety risk value R of the main steam pipeline until the calculation moment.
In step 1), the current time t i Set operation state S of (2) A (t i ) The method comprises the following steps:
time t before i-1 Set operation state S of (2) A (t i-1 ) The method comprises the following steps:
in step 2), each main steam pressure measuring point is immediately before time t i-1 Is the kth level of superState of compression S Bk (t i-1 ) The method comprises the following steps:
if MSP j (t i-1 )≥LV k ,S Bk (t i-1 )＝1,else,S Bk (t i-1 )＝0 (3)
each main steam pressure measuring point at the current time t i Is the kth stage overpressure state S Bk (t i )：
if MSP j (t i )≥LV k ,S Bk (t i )＝1,else,S Bk (t i )＝0 (4)
When each main steam pressure measuring point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) When the condition shown in the formula (5) is satisfied, the kth stage overpressure does not occur;
if S Bk (t i-1 )＝0∨S Bk (t i )＝0 (5)
when each main steam pressure measuring point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) When the condition shown in the formula (6) is satisfied, the kth stage overpressure just begins to occur;
if S Bk (t i-1 )＝0∨S Bk (t i )＝1 (6)
when each main steam pressure measuring point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) When the condition shown in the formula (7) is satisfied, the kth stage overpressure is in the process;
if S Bk (t i-1 )＝1∨S Bk (t i )＝1 (7)
when each main steam pressure measuring point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) When the condition shown in formula (8) is satisfied, then the kth stage overpressure will end:
if S Bk (t i-1 )＝1∨S Bk (t i )＝0 (8)
when the kth overpressure of each main steam pressure measuring point just begins to occur, the real-time overpressure safety risk value R of the main steam pressure measuring point jk (t i ) The method comprises the following steps:
when the kth overpressure of each main steam pressure measuring point is in the process, then the real-time overpressure safety risk value R of the main steam pressure measuring point jk (t i ) The method comprises the following steps:
when the kth overpressure of each main steam pressure measuring point is about to end, the real-time overpressure safety risk value R of the main steam pressure measuring point jk (t i ) The method comprises the following steps:
the accumulated overpressure safety risk value R from each main steam pressure measuring point to the moment of calculation j The method comprises the following steps:
wherein t is start Initial time, t, calculated for accumulating overpressure safety risk values now The current time is calculated for the accumulated overpressure safety risk value.
The accumulated overpressure safety risk value R from the main steam pipeline to the calculation moment is calculated as follows:
where j represents the main steam line having n main steam pressure stations.
The invention has the following beneficial effects:
when the real-time calculation method of the three-level overrun safety risk of the main steam pipeline pressure is specifically operated, the real-time grid-connected switch of the unit and the real-time power generation power of the unit are obtained in real time to carry out unit operation condition screening, the main steam pressure measuring point value is obtained in real time to carry out three-level overpressure state judgment, the corresponding real-time overpressure safety risk value calculation is carried out according to the overpressure state, the real-time calculation of the accumulated overpressure safety risk value of the main steam pressure measuring point and the real-time calculation of the accumulated overpressure safety risk value of the main steam pipeline are sequentially realized on the basis of the overpressure state, the overpressure condition of the main steam pipeline is represented by the overpressure safety risk value, references are provided for operators to adjust main steam parameters and related parameters, support is provided for production managers to develop technical supervision of the main steam pipeline, and technical support is provided for maintainers to pointedly formulate maintenance plans.
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FIG. 1 is a flow chart of the present invention.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, but not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. 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.
In the accompanying drawings, there is shown a schematic structural diagram in accordance with a disclosed embodiment of the invention. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
Referring to fig. 1, the real-time calculation method of the three-level overrun safety risk of the main steam pipeline pressure according to the invention comprises the following steps:
1) Determining a computing object
According to the actual condition of the thermal power plant, the calculation object is the main steam pipeline on the side A or the side B of the single unit.
2) Determining condition parameters and calculating parameters
The condition parameters are as follows: real-time grid-connected switch KG of unit, real-time generating power MW of unit and unit capacity MW of unit Design ；
The calculation parameters are as follows: main steam pressure MSP;
when there are multiple main steam pressure measuring points on the main steam pipeline, the main steam pressure measuring points are distinguished by a right lower corner mark j, and each measuring point value MSP j Independently participate in the calculation.
3) Determining a three-level overpressure limit
The three-level overpressure limit values are respectively a first-level overpressure limit value LV I Two-stage overpressure limit LV II Three-stage overpressure limit LV III Wherein LV is I <LV II <LV III 。
For the convenience of calculation, each level of the three levels of overpressure is uniformly represented by a right lower corner mark k, and the three levels of overpressure limit value is represented as LV k 。
4) Start computing and acquire real-time data
From the current time t i Starting calculation, acquiring condition parameters and calculation parameters from a database, and turning to step 5);
5) Continuous operation condition judgment of unit
Acquiring condition parameter set real-time grid-connected switch and set real-time generation power at current time t i The value KG [ ]t i ) MW (t) i ) Then the current time t i Set operation state S of (2) A (t i ) The method comprises the following steps:
acquiring real-time grid-connected switch of condition parameter unit and real-time generation power of unit at previous time t i-1 Is a value KG (t) i-1 ) MW (t) i-1 ) Wherein the previous time t i-1 Set operation state S of (2) A (t i-1 ) The method comprises the following steps:
when (S) A (t i )+S A (t i-1 ) 1), continuously running the unit, and turning to the step 6), otherwise, turning to the step 4);
6) Three-level overpressure condition judgment
Acquiring each main steam pressure measuring point at the previous time t i-1 Numerical MSP of (2) j (t i-1 ) Calculating the time t before each main steam pressure measuring point i-1 Is the kth stage overpressure state S Bk (t i-1 ) The method comprises the following steps:
if MSP j (t i-1 )≥LV k ,S Bk (t i-1 )＝1,else,S Bk (t i-1 )＝0 (3)
acquiring the current time t of each main steam pressure measuring point i Numerical MSP of (2) j (t i ) Calculating the current time t of each main steam pressure measuring point i Is the kth stage overpressure state S Bk (t i )：
if MSP j (t i )≥LV k ,S Bk (t i )＝1,else,S Bk (t i )＝0 (4)
When each main steam pressure measuring point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) When the condition shown in the formula (5) is satisfied, if the kth stage overpressure does not occur, the process goes to the step (4);
if S Bk (t i-1 )＝0∨S Bk (t i )＝0 (5)
when each main steam pressure measuring point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) When the condition shown in the formula (6) is satisfied, the kth stage overpressure just begins to occur, and the process goes to the step 71);
if S Bk (t i-1 )＝0∨S Bk (t i )＝1 (6)
when each main steam pressure measuring point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) If the condition shown in the formula (7) is satisfied, the kth stage overpressure is in the process, and the process goes to the step 72);
if S Bk (t i-1 )＝1∨S Bk (t i )＝1 (7)
when each main steam pressure measuring point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) When the condition shown in formula (8) is satisfied, the kth stage overpressure is terminated, and the process goes to step 73):
if S Bk (t i-1 )＝1∨S Bk (t i )＝0 (8)
7) Real-time overpressure safety risk value calculation of main steam pressure measuring point
For different kth level overpressure conditions, at the current time t according to each main steam pressure measuring point i Numerical MSP of (2) j (t i ) And at the previous time t i-1 Numerical MSP of (2) j (t i-1 ) Three-stage overpressure limit LV k Calculating the current time t i The real-time overpressure safety risk value of each main steam pressure measuring point is specifically as follows:
7-1) when the kth level overpressure of each main steam pressure measuring point just begins to occur, then the real-time overpressure safety risk value R of the main steam pressure measuring point jk (t i ) The method comprises the following steps:
7-2) when the kth stage overpressure of each main steam pressure measurement point is in the process, then the real-time overpressure safety risk value R of the main steam pressure measurement point jk (t i ) The method comprises the following steps:
7-3) when the kth level overpressure of each main steam pressure measurement point is about to end, then the real-time overpressure safety risk value R of the main steam pressure measurement point jk (t i ) The method comprises the following steps:
8) Real-time calculation of accumulated overpressure safety risk value of main steam pressure measuring point
At the current time t according to each main steam pressure measuring point i Real-time overpressure safety risk value R of (2) jk (t i ) Calculating an accumulated overpressure safety risk value R from each main steam pressure measuring point to the moment of calculation j The method comprises the following steps:
wherein t is start Initial time, t, calculated for accumulating overpressure safety risk values now The current time is calculated for the accumulated overpressure safety risk value.
9) Real-time calculation of accumulated overpressure safety risk value of main steam pipeline
The time from the interception of each main steam pressure measuring point to the calculation isCumulative overpressure safety risk value R j The accumulated overpressure safety risk value R from the main steam pipeline to the calculation moment is calculated as follows:
where j represents the main steam line having n main steam pressure stations.
And (3) finishing the real-time calculation of the accumulated overpressure safety risk value from each main steam pressure measuring point to the calculating moment and the accumulated overpressure safety risk value from the main steam pipeline to the calculating moment, writing data into a database, finishing the real-time calculation of the main steam pressure measuring point, and switching to 4) to start a new round of real-time calculation.
The above embodiment is only one of the implementation manners capable of implementing the technical solution of the present invention, and the scope of the claimed invention is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily recognized by those skilled in the art within the technical scope of the present invention.
Claims (10)
1. The real-time calculation method for the three-level overrun safety risk of the main steam pipeline pressure is characterized by comprising the following steps of:
1) Acquiring real-time grid-connected switch of unit and real-time generation power of unit at current time t i Is a value KG (t) i ) MW (t) i ) Calculating the current time t i Set operation state S of (2) A (t i ) The method comprises the steps of carrying out a first treatment on the surface of the Acquiring a real-time grid-connected switch of a unit and real-time generation power of the unit at a previous time t i-1 Is a value KG (t) i-1 ) MW (t) i-1 ) Calculate the previous time t i-1 Set operation state S of (2) A (t i-1 )；
When (S) A (t i )+S A (t i-1 ) 1), and then turning to the step 2);
2) Acquiring each main steam pressure measuring point at the previous time t i-1 Numerical MSP of (2) j (t i-1 ) Calculating the pressure of each main steamTime t before measuring point i-1 Is the kth stage overpressure state S Bk (t i-1 ) The method comprises the steps of carrying out a first treatment on the surface of the Acquiring the current time t of each main steam pressure measuring point i Numerical MSP of (2) j (t i ) Calculating the current time t of each main steam pressure measuring point i Is the kth stage overpressure state S Bk (t i )；
3) According to the previous time t of each main steam pressure measuring point i-1 Is the kth stage overpressure state S Bk (t i-1 ) Each main steam pressure measuring point is at the current time t i Is the kth stage overpressure state S Bk (t i ) Judging whether the k-th overpressure occurs or not;
4) When the kth level overpressure occurs, calculating the current time t according to the time when the kth level overpressure occurs i Real-time overpressure safety risk value R of each main steam pressure measuring point jk (t i )；
5) According to the current time t i Real-time overpressure safety risk value R of each main steam pressure measuring point jk (t i ) Calculating an accumulated overpressure safety risk value R from each main steam pressure measuring point to the moment of calculation j ；
6) Based on the accumulated overpressure safety risk value R from each main steam pressure measuring point to the moment of calculation j And calculating an accumulated overpressure safety risk value R of the main steam pipeline until the calculation moment.
2. The method for real-time calculation of main steam line pressure three-level overrun safety risk according to claim 1, wherein in step 1), the current time t is i Set operation state S of (2) A (t i ) The method comprises the following steps:
time t before i-1 Set operation state S of (2) A (t i-1 ) The method comprises the following steps:
3. the method for real-time calculation of three-level overrun safety risk of main steam line pressure according to claim 1, wherein in step 2), each main steam pressure measurement point is immediately before time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) The method comprises the following steps:
if MSP j (t i-1 )≥LV k ,S Bk (t i-1 )＝1,else,S Bk (t i-1 )＝0 (3)
each main steam pressure measuring point at the current time t i Is the kth stage overpressure state S Bk (t i ) The method comprises the following steps:
if MSP j (t i )≥LV k ,S Bk (t i )＝1,else,S Bk (t i )＝0 (4)。
4. the method for real-time calculation of a three-level overrun safety risk of main steam line pressure according to claim 1, wherein when each main steam pressure measurement point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) When the condition shown in the formula (5) is satisfied, the kth stage overpressure does not occur;
if S Bk (t i-1 )＝0∨S Bk (t i )＝0 (5)。
5. the method for real-time calculation of a three-level overrun safety risk of main steam line pressure according to claim 1, wherein when each main steam pressure measurement point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) When the condition shown in the formula (6) is satisfied, the kth stage overpressure just begins to occur;
if S Bk (t i-1 )＝0∨S Bk (t i )＝1 (6)。
6. the method for real-time calculation of a three-level overrun safety risk of main steam line pressure according to claim 1, wherein when each main steam pressure measurement point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) When the condition shown in the formula (7) is satisfied, the kth stage overpressure is in the process;
if S Bk (t i-1 )＝1∨S Bk (t i )＝1 (7)。
7. the method for real-time calculation of a three-level overrun safety risk of main steam line pressure according to claim 1, wherein when each main steam pressure measurement point is at the current time t i Is the kth stage overpressure state S Bk (t i ) And a previous time t i-1 Is the kth stage overpressure state S Bk (t i-1 ) When the condition shown in formula (8) is satisfied, then the kth stage overpressure will end:
if S Bk (t i-1 )＝1∨S Bk (t i )＝0 (8)。
8. the method for real-time calculation of three-level overrun safety risk of main steam line pressure according to claim 1, wherein when the kth level overpressure of each main steam pressure measuring point starts to occur, the real-time overpressure safety risk value R of the main steam pressure measuring point jk (t i ) The method comprises the following steps:
when the kth overpressure of each main steam pressure measuring point is in the process, then the real-time overpressure safety risk value R of the main steam pressure measuring point jk (t i ) The method comprises the following steps:
when the kth overpressure of each main steam pressure measuring point is about to end, the real-time overpressure safety risk value R of the main steam pressure measuring point jk (t i ) The method comprises the following steps:
9. the method for real-time calculation of three-level overrun safety risk of main steam line pressure according to claim 1, wherein each main steam pressure measuring point has an accumulated overpressure safety risk value R up to the calculation time j The method comprises the following steps:
wherein t is start Initial time, t, calculated for accumulating overpressure safety risk values now The current time is calculated for the accumulated overpressure safety risk value.
10. The method for real-time calculation of three-level overrun safety risk of main steam line pressure according to claim 1, wherein the cumulative overpressure safety risk value R up to the calculation time of main steam line is calculated as:
where j represents the main steam line having n main steam pressure stations.
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