CN114817835A - Real-time calculation method for three-level over-limit safety risk of main steam pipeline pressure - Google Patents
Real-time calculation method for three-level over-limit safety risk of main steam pipeline pressure Download PDFInfo
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Abstract
The invention discloses a real-time calculation method for three-level transfinite safety risk of main steam pipeline pressure, which comprises the following steps: measuring the previous moment t according to the main steam pressure i‑1 Of the kth stage of overpressure condition S Bk (t i‑1 ) And each main steam pressure measuring point is at the current moment t i Of the kth stage of overpressure condition S Bk (t i ) Judging whether the kth-level overpressure occurs or not; when the kth level of overpressure occurs, calculating the current time t according to the moment when the kth level of overpressure occurs i Real-time overpressure safety risk value R of each main steam pressure measuring point jk (t i ) (ii) a According to the current time t i Real-time overpressure safety risk at each main steam pressure measurement pointValue R jk (t i ) Calculating the accumulated overpressure safety risk value R of each main steam pressure measuring point till the calculation moment j (ii) a According to the accumulated overpressure safety risk value R of each main steam pressure measuring point till the calculation moment j And calculating an accumulated overpressure safety risk value R of the main steam pipeline until the calculation time, and calculating the three-level overrun safety risk of the pressure of the main steam pipeline in real time by using the method.
Description
Technical Field
The invention belongs to the technical field of thermal power generation industry, and relates to a real-time calculation method for three-level over-limit safety risk of main steam pipeline pressure.
Background
A main steam system of a thermal power plant sends steam generated by a boiler to a steam turbine for applying work, and the main steam system consists of a main steam pipeline, a valve and a drainage device, wherein the main steam pipeline is connected with an outlet header of a boiler superheater to a main steam valve at an inlet of the steam turbine. The main steam pipeline is the most important part, and the importance of the main steam pipeline as one of four pipelines of the thermal power plant is also self-evident.
Because the main steam pressure value of a thermal power generating unit is often hundreds of times of the atmospheric pressure, for example, the value of an ultra-supercritical unit can reach 27MPa (270 times of the atmospheric pressure), the safety is considered, the main steam pipeline is designed into a large-size thick-wall part, a design institute, a boiler and a steam turbine manufacturing plant can also synthesize various design working conditions to give a proper design operating pressure, but the operating condition is severe due to unstable factors in the service process, and the overpressure operation of the main steam pipeline is caused. The main steam pressure brings axial and circumferential internal pressure stress to the main steam pipeline, especially when the main steam pressure is in overpressure operation, under the high-temperature environment and the large internal pressure stress environment, the aging of pipeline materials can be accelerated, and under the conditions of stress concentration caused by pipe defects, residual stress caused by welding and micro-crack defects, frequent overpressure operation or even large-amplitude overpressure operation can amplify the stress concentration or initiate micro-crack expansion to cause failure accidents, so that the monitoring of overpressure operation or even multi-stage overpressure operation monitoring on the main steam pipeline is necessary and important.
Therefore, based on three levels of overpressure, a real-time calculation method for the pressure three-level over-limit safety risk of the main steam pipeline is provided, the overpressure condition of the main steam pipeline is represented by the pressure three-level over-limit safety risk value, operation personnel can conveniently pay special attention to the operation condition of the main steam pressure, the production management professionals can conveniently strengthen the technical supervision of the main steam pipeline, and reference is provided for the maintenance personnel to make a maintenance plan in a targeted manner.
At present, only literature reports apply ANSYS finite element software numerical simulation, and an equivalent stress mathematical model of a main steam pipeline elbow danger point is provided, such as literature 'reliability theory-based main steam pipeline life prediction, 2008, North China Power university (Beijing)'; there is also a literature report that the design pressure value specification of the main steam pipeline of the existing supercritical (super) critical unit in China is analyzed, and the working pressure under the working condition of the maximum continuous evaporation capacity (BMCR) of the boiler is proposed to be used as the design pressure, such as the literature, "the design pressure value of the main steam pipeline of the supercritical (super) critical unit, 2010 (08)". However, a real-time calculation method for the three-level transfinite 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 over-limit safety risk of the pressure of the main steam pipeline, which can calculate the three-level over-limit safety risk of the pressure of the main steam pipeline in real time.
In order to achieve the purpose, the real-time calculation method for the three-level transfinite safety risk of the main steam pipeline pressure comprises the following steps:
1) unit real-time grid-connected switch and unit real-time power generation power at current moment t i Value of (a) KG (t) i ) And MW (t) i ) Calculating the current time t i Operating state S of the unit A (t i ) (ii) a Acquiring real-time grid-connected switch of unit and real-time generating power of unit at previous moment t i-1 Value of (a) KG (t) i-1 ) And MW (t) i-1 ) Calculating the previous time t i-1 Operating state S of the unit A (t i-1 )；
When (S) A (t i )+S A (t i-1 ) ) is not less than 1, then the step 2) is carried out;
2) acquiring the pressure of each main steam measuring point at the previous moment t i-1 MSP (numerical value of j (t i-1 ) Calculating the previous time t of each main steam pressure measuring point i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) (ii) a Obtaining the current time t of each main steam pressure measuring point i MSP (numerical value of j (t i ) Calculating the current time t of each main steam pressure measuring point i Of the kth stage of overpressure condition S Bk (t i )；
3) Measuring the previous moment t according to the main steam pressure i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) And each main steam pressure measuring point is at the current moment t i Of the kth stage of overpressure condition S Bk (t i ) Judging whether the kth-level overpressure occurs or not;
4) when the kth level of overpressure occurs, calculating the current time t according to the moment when the kth level of 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 the accumulated overpressure safety risk value R of each main steam pressure measuring point till the calculation moment j ；
6) According to the accumulated overpressure safety risk value R of each main steam pressure measuring point till the calculation moment j And calculating the accumulated overpressure safety risk value R of the main steam pipeline till the calculation time.
In step 1), the current time t i Operating state S of the unit A (t i ) Comprises the following steps:
previous time t i-1 Operating state S of the unit A (t i-1 ) Comprises the following steps:
in step 2), the previous moment t of each main steam pressure measuring point i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) 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 is at the current moment t i Of the kth stage of overpressure condition 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 moment t i Of the kth stage of overpressure condition S Bk (t i ) And the previous time t i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) When the condition shown in the formula (5) is met, 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 moment t i Of the kth stage of overpressure condition S Bk (t i ) And the previous time t i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) When the condition shown in the formula (6) is satisfied, the kth-stage overpressure just starts 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 moment t i Of the kth stage of overpressure condition S Bk (t i ) And the previous time t i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) When the condition shown in the formula (7) is met, 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 moment t i Of the kth stage of overpressure condition S Bk (t i ) And the previous time t i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) When the condition shown in equation (8) is satisfied, the kth stage overpressure will end:
if S Bk (t i-1 )＝1∨S Bk (t i )＝0 (8)
when the kth-stage 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 ) Comprises the following steps:
when the kth-stage overpressure of each main steam pressure measuring point is in the process, the real-time overpressure safety risk value R of the main steam pressure measuring point jk (t i ) Comprises the following steps:
when the kth-stage 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 ) Comprises the following steps:
accumulated overpressure safety risk value R of each main steam pressure measuring point till calculation moment j Comprises the following steps:
wherein, t start Initial time, t, calculated for accumulating overpressure safety risk values now The current time is calculated for the accumulated overpressure safety risk value.
Calculating the accumulated overpressure safety risk value R of the main steam pipeline until the calculation time as follows:
where j denotes that the main steam line has n main steam pressure stations.
The invention has the following beneficial effects:
when the real-time calculation method for the three-level transfinite safety risk of the main steam pipeline pressure is operated specifically, the running condition of the unit is screened by acquiring the real-time grid-connected switch of the unit and the real-time generating power of the unit in real time, the main steam pressure measurement value is acquired in real time to judge the three-level overpressure state, calculating corresponding real-time overpressure safety risk values according to the overpressure state, sequentially calculating the accumulated overpressure safety risk values of the main steam pressure measuring points and the accumulated overpressure safety risk values of the main steam pipeline in real time on the basis of the calculated overpressure safety risk values, the overpressure condition of the main steam pipeline is represented by the overpressure safety risk value, reference is provided for operators to adjust main steam parameters and related parameters, support is provided for production managers to carry out technical supervision on the main steam pipeline, and technical support is provided for maintainers to make maintenance plans in a targeted mode.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the real-time calculation method for the three-level overrun safety risk of the main steam pipeline pressure comprises the following steps:
1) determining a computational object
According to the actual situation of the thermal power plant, the calculation object is a main steam pipeline on the A side or the B side of a single unit.
2) Determining condition parameters and calculating parameters
The condition parameters are as follows: unit real-time grid-connected switch KG, unit real-time generating power MW and unit installed capacity MW Design ；
The calculation parameters are as follows: main steam pressure MSP;
when a plurality of main steam pressure measuring points exist on the main steam pipeline, the main steam pressure measuring points are distinguished by using a right lower corner mark j, and each measuring point value MSP j And (4) independently participating in calculation.
3) Determining three-level overpressure limits
The three overpressure limits are respectively a first overpressure limit LV I Second overpressure limit LV II And a three-level overpressure limit LV III Wherein, LV I <LV II <LV III 。
For convenience of calculation, each stage of three-stage overpressure is uniformly represented by a lower right corner mark k, and three-stage overpressure limit values are represented as LV k 。
4) Start of calculation and acquisition of real-time data
From the current time t i Starting calculation, acquiring condition parameters and calculation parameters from a database, and turning to the step 5);
5) continuous operation condition judgment of unit
Acquiring real-time grid-connected switch of condition parameter unit and real-time generating power of unit at current moment t i Value of (a) KG (t) i ) And MW (t) i ) Then the current time t i Operating state S of the unit A (t i ) Comprises the following steps:
acquiring condition parameter of real-time grid-connected switch of unit and real-time generating power of unit at previous moment t i-1 Value of (a) KG (t) i-1 ) And MW (t) i-1 ) Wherein the previous time t i-1 Operating state S of the unit A (t i-1 ) Comprises the following steps:
when (S) A (t i )+S A (t i-1 ) ) is not less than 1, if the unit is continuously operated, the step 6) is carried out, otherwise, the step 4) is carried out;
6) three-level overpressure condition determination
Acquiring the pressure of each main steam measuring point at the previous moment t i-1 MSP (numerical value of j (t i-1 ) Calculating the previous moment t of each main steam pressure measuring point i-1 Class k overpressure condition S Bk (t i-1 ) 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)
obtaining the current time t of each main steam pressure measuring point i Value of (MSP) j (t i ) Calculating the current time t of each main steam pressure measuring point i Of the kth stage of overpressure condition 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 moment t i Of the kth stage of overpressure condition S Bk (t i ) And the previous time t i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) When the condition shown in the formula (5) is met, if the kth stage overpressure does not occur, the step 4) is carried out;
if S Bk (t i-1 )＝0∨S Bk (t i )＝0 (5)
when each main steam pressure measuring point is at the current moment t i Of the kth stage of overpressure condition S Bk (t i ) And the previous time t i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) When the condition shown in the formula (6) is satisfied, the kth stage overpressure just starts to occur, and the process goes to 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 moment t i Of the kth stage of overpressure condition S Bk (t i ) And the previous time t i-1 Class k overpressure condition S Bk (t i-1 ) When the condition shown in the formula (7) is met, the kth stage overpressure is in the process, and the step 72) is carried out;
if S Bk (t i-1 )＝1∨S Bk (t i )＝1 (7)
when each main steam pressure measuring point is at the current moment t i Of the kth stage of overpressure condition S Bk (t i ) And the previous time t i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) When the condition shown in formula (8) is satisfied, the kth stage overpressure will end, and go to step 73):
if S Bk (t i-1 )＝1∨S Bk (t i )＝0 (8)
7) real-time overpressure safety risk value calculation for main steam pressure measurement point
Aiming at different kth-stage overpressure conditions, measuring points are arranged at the current moment t according to each main steam pressure i MSP (numerical value of j (t i ) And at the previous time t i-1 MSP (numerical value of j (t i-1 ) And a three-level overpressure limit LV k Calculating the current time t i The real-time overpressure safety risk value of each main steam pressure measuring point specifically comprises the following steps:
7-1) when the kth stage 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 ) Comprises the following steps:
7-2) when the kth stage 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 ) Comprises the following steps:
7-3) when the kth stage overpressure of each main steam pressure measuring point is about to end, then the real-time overpressure safety risk value R of the main steam pressure measuring point jk (t i ) Comprises the following steps:
8) real-time calculation of accumulated overpressure safety risk value of main steam pressure measuring point
According to each main steam pressure measuring point at the current moment t i Real-time overpressure safety risk value R jk (t i ) Calculating the cutoff of each main steam pressure measuring pointCumulative overpressure safety risk value R up to time j Comprises the following steps:
wherein, t 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 values of main steam pipeline
According to the accumulated overpressure safety risk value R of each main steam pressure measuring point till the calculation moment j Calculating the accumulated overpressure safety risk value R of the main steam pipeline until the calculation time as follows:
where j denotes that the main steam line has n main steam pressure stations.
And (4) finishing the real-time calculation of the accumulated overpressure safety risk value of each main steam pressure measuring point till the calculation time and the accumulated overpressure safety risk value of the main steam pipeline till the calculation time, writing data into a database, finishing the real-time calculation of the current round, and turning to 4) starting a new round of real-time calculation.
The above-described embodiment is only one of the embodiments that can implement the technical solution of the present invention, and the scope of the present invention is not limited by the embodiment, but includes any variations, substitutions and other embodiments that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed.
Claims (10)
1. A real-time calculation method for three-level overrun safety risk of main steam pipeline pressure is characterized by comprising the following steps:
1) acquiring real-time grid-connected switch of unit and real-time generating power of unit at current time t i Value of (a) KG (t) i ) And MW (t) i ) Calculating the current time t i Operating state S of the unit A (t i ) (ii) a Acquiring real-time grid-connected switch of unit and real-time generating power of unit at previous moment t i-1 Value of (2) KG (t) i-1 ) And MW (t) i-1 ) Calculating the previous time t i-1 Operating state S of the unit A (t i-1 )；
When (S) A (t i )+S A (t i-1 ) ) is not less than 1, then the step 2) is carried out;
2) acquiring the pressure of each main steam measuring point at the previous moment t i-1 MSP (numerical value of j (t i-1 ) Calculating the previous moment t of each main steam pressure measuring point i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) (ii) a Obtaining the current time t of each main steam pressure measuring point i MSP (numerical value of j (t i ) Calculating the current time t of each main steam pressure measuring point i Of the kth stage of overpressure condition S Bk (t i )；
3) Measuring the previous moment t according to the main steam pressure i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) And each main steam pressure measuring point is at the current moment t i Of the kth stage of overpressure condition S Bk (t i ) Judging whether the kth-level overpressure occurs or not;
4) when the kth level of overpressure occurs, calculating the current time t according to the moment when the kth level of 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 the accumulated overpressure safety risk value R of each main steam pressure measuring point till the calculation moment j ；
6) According to the accumulated overpressure safety risk value R of each main steam pressure measuring point till the calculation moment j And calculating the accumulated overpressure safety risk value R of the main steam pipeline till the calculation time.
2. The main steam line pressure three stage overrunning safety of claim 1The real-time calculation method of the total risk is characterized in that in the step 1), the current time t is i Operating state S of the unit A (t i ) Comprises the following steps:
previous time t i-1 Operating state S of the unit A (t i-1 ) Comprises the following steps:
3. the method for calculating the three-level safety risk of exceeding the limit of the main steam pipeline pressure according to claim 1, wherein in the step 2), the previous time t of each main steam pressure measuring point is i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) 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 is at the current moment t i Of the kth stage of overpressure condition S Bk (t i ) 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 of claim 1, wherein the method comprises calculating the safety risk of a tertiary overrun condition at each main steam pressure measurement point at a current time t i Of the kth stage of overpressure condition S Bk (t i ) And the previous time t i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) When the condition shown in the formula (5) is met, the kth stage overpressure does not occur;
if S Bk (t i-1 )＝0∨S Bk (t i )＝0 (5)。
5. the method of claim 1, wherein each main steam pressure measurement point is at a current time t i Of the kth stage of overpressure condition S Bk (t i ) And the previous time t i-1 Class k overpressure condition S Bk (t i-1 ) When the condition shown in the formula (6) is satisfied, the kth-stage overpressure just starts to occur;
if S Bk (t i-1 )＝0∨S Bk (t i )＝1 (6)。
6. the method of claim 1, wherein the method comprises calculating the safety risk of a tertiary overrun condition at each main steam pressure measurement point at a current time t i Class k overpressure condition S Bk (t i ) And the previous time t i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) When the condition shown in the formula (7) is met, the kth stage overpressure is in the process;
if S Bk (t i-1 )＝1∨S Bk (t i )＝1 (7)。
7. the method of claim 1, wherein the method comprises calculating the safety risk of a tertiary overrun condition at each main steam pressure measurement point at a current time t i Of the kth stage of overpressure condition S Bk (t i ) And the previous time t i-1 Of the kth stage of overpressure condition S Bk (t i-1 ) When the condition shown in equation (8) is satisfied, the kth stage overpressure will end:
if S Bk (t i-1 )＝1∨S Bk (t i )＝0 (8)。
8. the method of claim 1, wherein the real-time overpressure at the primary steam pressure measurement points is calculated when the kth overpressure at each primary steam pressure measurement point begins to occurSafety risk value R jk (t i ) Comprises the following steps:
when the kth-stage overpressure of each main steam pressure measuring point is in the process, the real-time overpressure safety risk value R of the main steam pressure measuring point jk (t i ) Comprises the following steps:
when the kth-stage 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 ) Comprises the following steps:
9. the method for calculating the safety risk of three-level overrun of the main steam pipeline pressure as claimed in claim 1, wherein the accumulated overpressure safety risk value R of each main steam pressure measuring point up to the calculation time j Comprises the following steps:
wherein, t 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 real-time calculation method of the three-level safety risk of overrun of the main steam pipeline pressure as claimed in claim 1, characterized in that the accumulated overpressure safety risk value R of the main steam pipeline up to the calculation time is calculated as:
where j denotes that the main steam line has n main steam pressure stations.
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