CN114790920A - Method for calculating overpressure state of high-temperature reheat steam pipeline in real time - Google Patents
Method for calculating overpressure state of high-temperature reheat steam pipeline in real time Download PDFInfo
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- CN114790920A CN114790920A CN202210577094.3A CN202210577094A CN114790920A CN 114790920 A CN114790920 A CN 114790920A CN 202210577094 A CN202210577094 A CN 202210577094A CN 114790920 A CN114790920 A CN 114790920A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
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Abstract
The invention discloses a method for calculating the overpressure state of a high-temperature reheating steam pipeline in real time, which comprises the following steps of; 1) acquiring reheat steam pressure RHP of each reheat steam pressure measuring point on high-temperature reheat steam pipeline of unit i (ii) a 2) Obtaining the generated power at the previous moment t now‑1 Real-time generated power P e (t now‑1 ) And current time t now Real-time generated power P e (t now ) Judging whether the unit operates normally or not, and if the unit operates normally and continuously, turning to the step 3), otherwise, turning to the step 1); 3) confirming the current time t now Acquiring the reheat steam pressure RHP of all reheat steam pressure measuring points in the single complete overpressure process i (t) calculating an accumulated overpressure state value S of the high-temperature reheat steam pipeline up to the calculation time, and representing the overpressure state of the high-temperature reheat steam pipeline through the accumulated overpressure state value S of the high-temperature reheat steam pipeline up to the calculation timeThe overpressure condition of the high-temperature reheat steam line can be calculated in real time.
Description
Technical Field
The invention belongs to the technical field of thermal power generation industry, and particularly relates to a method for calculating an overpressure state of a high-temperature reheat steam pipeline in real time.
Background
The reheat steam system of the thermal power plant is a general term of all pipelines and accessory parts thereof in the process of sending steam which does part of work in a steam turbine back to a boiler for heating again and returning the steam to the steam turbine for doing work. The system consists of a cold high-temperature reheating steam pipeline from a steam outlet of a high-pressure cylinder of the steam turbine to an inlet of a reheater of a boiler, a high-temperature reheating steam pipeline from an outlet of the reheater to a medium-pressure cylinder of the steam turbine, a valve and a water drainage device. Because the high-temperature reheating steam pipeline is subjected to a high-temperature high-pressure service environment, particularly, a plurality of units which are put into service in 2000 years and later have been operated for more than 10 ten thousand hours, the material performance is degraded, the operation condition is bad, and the safety is very important.
Although a design unit can give appropriate design pressure, and the specification of the pipe can also consider margins, in the service process, the overpressure operation of the high-temperature reheating steam pipeline can still be caused by severe operating conditions and unstable factors, the aging of the pipeline material can be accelerated under the dual action of high-temperature and internal pressure stress, stress concentration can be caused at the defect position or the crack expansion can be caused at the crack position to cause failure, and particularly, the leakage or failure probability caused by overpressure at the welding seam of a bent pipe section, a tee joint and a straight pipe section is exponentially increased.
In addition, as the arrangement of the high-temperature reheating steam pipeline can pass through the vicinity of the centralized control room, once leakage or failure occurs, serious accidents of personal injury and death can be caused, and therefore, the real-time calculation of the overpressure state of the high-temperature reheating steam pipeline is very meaningful.
Therefore, a method for calculating the overpressure state of the high-temperature reheating steam pipeline in real time is provided, the actual overpressure condition of the high-temperature reheating steam pipeline is reflected by the overpressure state value, operation and maintenance personnel can conveniently master the health condition of the high-temperature reheating steam pipeline, and the safety of a unit is ensured.
At present, in published documents, only document reports that stress distribution at a weld joint of a high-temperature reheat steam pipeline is reasonably calculated based on a finite element stress analysis method, such as document "stress optimization analysis of weld joint of high-temperature reheat steam pipeline based on finite element, 2021 (37)"; there are also reports in the literature that pressure drop of 1000MW reheat steam system piping is optimized by using american AFT fluid analysis and calculation software, and optimal piping selection specifications are proposed, such as "analysis study of pressure drop of main steam and reheat steam system in thermal power plant", 2017(28) ". However, no method for calculating the overpressure condition of the high-temperature reheat steam pipeline in real time is reported.
Disclosure of Invention
It is an object of the present invention to overcome the above-mentioned disadvantages of the prior art and to provide a method for calculating an overpressure condition of a high temperature reheat steam line in real time, which is capable of calculating an overpressure condition of a high temperature reheat steam line in real time.
In order to achieve the purpose, the method for calculating the overpressure state of the high-temperature reheat steam pipeline in real time comprises the following steps of:
1) acquiring reheat steam pressure RHP of each reheat steam pressure measuring point on high-temperature reheat steam pipeline of unit i ；
2) Obtaining the generated power at the previous moment t now-1 Real-time generated power P e (t now-1 ) And current time t now Real-time generated power P e (t now ) Judging whether the unit operates normally or not, and if the unit operates normally and continuously, turning to the step 3), otherwise, turning to the step 1);
3) determining reheat steam pressure measurements on high temperature reheat steam lines of a unitDot at the previous time t now-1 Pressure RHP of reheat steam i (t now-1 ) And the current time t now Reheat steam pressure RHP i (t now ) Judging the overpressure state of the reheat steam pressure measuring point according to the overpressure state, and turning to the step 1) when the judgment result is that overpressure does not exist, overpressure starts or overpressure continues, and turning to the step 4) when the judgment result is that overpressure is finished;
4) confirming the current time t now Acquiring the reheat steam pressure RHP of all reheat steam pressure measuring points in the single complete overpressure process i And (t), calculating an accumulated overpressure state value S of the high-temperature reheating steam pipeline till the calculation time, and representing the overpressure state of the high-temperature reheating steam pipeline through the accumulated overpressure state value S of the high-temperature reheating steam pipeline till the calculation time.
The specific operation of the step 4) is as follows:
41) confirming the current time t now Acquiring the reheat steam pressure RHP of all reheat steam pressure measuring points in the single overpressure process in the previous single complete overpressure process i (t) and calculating the current time t now Single overpressure condition value S of previous reheat steam pressure measurement points i (t)；
42) According to the current time t now Single overpressure condition value S of previous reheat steam pressure measurement points i (t) calculating each reheat steam pressure measurement point until the current time t now Cumulative overpressure condition value S i ；
43) Cutting to the current moment t according to each reheat steam pressure measuring point now Cumulative overpressure condition value S i And calculating an accumulated overpressure state value S of the high-temperature reheating steam pipeline till the current moment.
When the condition shown in the formula (1) is met, the unit is considered to run and continuously run;
when the condition shown in the formula (2) is met, the reheat steam pressure measuring point is considered not to be over-pressurized;
if RHP i (t now-1 )<PA∨RHP i (t now )<PA (2)。
when the condition shown in the formula (3) is met, the reheat steam pressure measuring point is considered to be in overpressure;
if RHP i (t now-1 )<PA∨RHP i (t now )>＝PA (3)。
when the condition shown in the formula (4) is met, the reheat steam pressure measuring point is considered to be continuously over-pressurized;
if RHP i (t now-1 )>＝PA∨RHP i (t now )>＝PA (4)。
when the condition shown in the formula (5) is met, determining that the overpressure of the reheat steam pressure measuring point is over;
if RHP i (t now-1 )>＝PA∨RHP i (t now )<PA (5)。
current time t now Single overpressure condition value S of previous reheat steam pressure measurement points i (t)：
Wherein, t start Overpressure start time, t, for a single overpressure event end Is the overpressure end time of a single overpressure process.
Each reheat steam pressure measuring point is intercepted to the current time t now Cumulative overpressure condition value S i ：
Wherein, t 0 To calculate the initial time, t now Is the current time of day.
The accumulated overpressure state value S of the high-temperature reheat steam pipeline up to the current moment is as follows:
S＝max{S 1 ,S 2 ,S 3 ...,S i ...,S n } (8)
wherein i represents that the high temperature reheat steam pipeline has n reheat steam pressure measuring points.
The invention has the following beneficial effects:
during specific operation, the method for calculating the overpressure state of the high-temperature reheat steam pipeline in real time carries out unit operation judgment by acquiring the real-time power generation power value of the unit operation state parameters, carries out overpressure judgment on each reheat steam pressure measurement point value in real time, calculates the single overpressure state value of each reheat steam pressure measurement point in real time according to the complete single overpressure process, calculates the accumulated overpressure state value of each reheat steam pressure measurement point in real time in an expanded time mode, and finally calculates the accumulated overpressure state value of the high-temperature reheat steam pipeline in real time based on a plurality of reheat steam pressure measurement points. The overpressure state of the high-temperature reheating steam pipeline is represented by the overpressure state value, and technical support is provided for power plant operation and maintenance technicians to conduct operation examination and unit supervision.
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a diagram illustrating the confirmation of the current time t now Previous single complete overpressure profile.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, 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 do not limit the scope of the disclosure of the present invention. 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 and 2, the method for calculating the overpressure condition of the high temperature reheat steam line in real time according to the present invention comprises the steps of:
1) determining a computational object
No matter how the high-temperature reheating steam pipeline of the thermal power plant is arranged and moved, the calculation object is the high-temperature reheating steam pipeline of the unit.
2) Determining an overpressure warning value
And determining an overpressure alarm value PA of the reheat steam pressure of the high-temperature reheat steam pipeline according to the operation rule.
3) Determining calculation-related parameters
And calculating related parameters including overpressure calculation parameters and unit running state parameters.
The overpressure calculation parameter is reheat steam pressure RHP, when a plurality of reheat steam pressure measuring points exist, right lower corner marks i are used for distinguishing, and each reheat steam pressure RHP i All participate in real-time calculations.
The unit running state parameters comprise real-time power generation power P e And installed capacity P e0 。
4) Start calculation and obtain real-time data
From the current time t now Starting to calculate, and acquiring the reheat steam pressure RHP of each reheat steam pressure measuring point i Then go to step 5);
5) unit operation judgment
Obtaining the generated power at the previous moment t now-1 Real-time generated power P e (t now-1 ) And current time t now Real-time generated power P e (t now ) And then judge the machine by thisWhether the group runs normally and continuously;
when the condition shown in the formula (1) is met, the unit is considered to run and continuously run, the step 6 is carried out, otherwise, the unit is considered to be stopped or started to run, and the step 4 is carried out;
6) point overpressure determination
Acquiring the pressure measuring point of each reheat steam at the previous moment t now-1 Pressure RHP of reheat steam i (t now-1 ) And the current time t now Reheat steam pressure RHP i (t now ) And then the overpressure judgment is carried out.
When the condition shown in the formula (2) is met, the reheat steam pressure measuring point is not over-pressurized, and then the step 4) is carried out;
if RHP i (t now-1 )<PA∨RHP i (t now )<PA (2)
when the condition shown in the formula (3) is met, the reheat steam pressure measuring point is considered to be in overpressure, and the step 4) is carried out;
if RHP i (t now-1 )<PA∨RHP i (t now )>＝PA (3)
when the condition shown in the formula (4) is met, the reheat steam pressure measuring point is considered to be continuously over-pressurized, and the step 4) is continued to be carried out;
if RHP i (t now-1 )>＝PA∨RHP i (t now )>＝PA (4)
when the condition shown in the formula (5) is met, the overpressure of the reheat steam pressure measuring point is considered to be finished, and then the step 7) is carried out;
if RHP i (t now-1 )>＝PA∨RHP i (t now )<PA (5)
7) real-time calculation of single overpressure state value and accumulated overpressure state value of measuring point
When the overpressure of the reheat steam pressure measuring point is finished, the current moment t is confirmed now Previous single pass completionOverpressure process (as shown in figure 2), reheat steam pressure RHP of all reheat steam pressure measuring points in single overpressure process is obtained i (t) and calculating the current time t in real time according to the equation (6) now Single overpressure state value S of each previous reheat steam pressure measuring point i (t)：
Wherein, t start Overpressure start time, t, for a single overpressure event end Is the overpressure end time of a single overpressure process.
Expanding the statistical time, and calculating the instant t of each reheat steam pressure measuring point in real time according to the formula (7) now Cumulative overpressure condition value S i ：
Wherein, t 0 To calculate the initial time, t now Is the current time of day.
8) Calculating an accumulated overpressure state value S of the high-temperature reheating steam pipeline up to the current moment in real time, and representing the overpressure state of the high-temperature reheating steam pipeline through the accumulated overpressure state value S of the high-temperature reheating steam pipeline up to the current moment;
cutting to the current moment t according to each reheat steam pressure measuring point now Cumulative overpressure condition value S i And calculating the accumulated overpressure state value S of the high-temperature reheat steam pipeline until the current time according to the formula (8) as follows:
S＝max{S 1 ,S 2 ,S 3 ...,S i ...,S n } (8)
where i represents a high temperature reheat steam line having n reheat steam pressure measurement points.
And finally, finishing real-time calculation, writing the single overpressure state value of the reheat steam pressure measuring point, the accumulated overpressure state value up to the current moment and the accumulated overpressure state value up to the current moment of the high-temperature reheat steam pipeline into a database, finishing the calculation of the current round, and turning to 4) starting a new round of 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 method for calculating an overpressure condition of a high temperature reheat steam line in real time, comprising the steps of:
1) acquiring reheat steam pressure RHP of each reheat steam pressure measuring point on high-temperature reheat steam pipeline of unit i ；
2) Obtaining the generated power at the previous moment t now-1 Real-time generated power P e (t now-1 ) And the current time t now Real-time generated power P e (t now ) Judging whether the unit operates normally or not according to the judgment result, and turning to the step 3) when the unit operates and continuously operates, otherwise, turning to the step 1);
3) determining each reheat steam pressure measuring point on a high-temperature reheat steam pipeline of a unit at the previous moment t now-1 Pressure RHP of reheat steam i (t now-1 ) And the current time t now Pressure RHP of reheat steam i (t now ) Judging the overpressure state of the reheat steam pressure measuring point according to the overpressure state, and turning to the step 1) when the judgment result is that overpressure does not exist, overpressure starts or overpressure continues, and turning to the step 4) when the judgment result is that overpressure is finished;
4) confirming the current time t now In the previous single complete overpressure process, the reheat steam pressure RHP of all reheat steam pressure measuring points in the single complete overpressure process is obtained i (t) calculating an accumulated overpressure state value S of the high-temperature reheat steam pipe up to the calculation time, and representing the high-temperature reheat steam pipe by the accumulated overpressure state value S of the high-temperature reheat steam pipe up to the calculation timeOverpressure conditions of the steam pipe.
2. The method for calculating the overpressure condition of the high-temperature reheat steam line in real time as claimed in claim 1, wherein the specific operation of step 4) is:
41) confirming the current time t now Acquiring the reheat steam pressure RHP of all reheat steam pressure measuring points in the single overpressure process in the previous single complete overpressure process i (t) and calculating the current time t now Single overpressure condition value S of previous reheat steam pressure measurement points i (t)；
42) According to the current time t now Single overpressure condition value S of previous reheat steam pressure measurement points i (t) calculating the intercept of each reheat steam pressure measuring point to the current time t now Cumulative overpressure condition value S i ；
43) Intercepting to the current time t according to each reheat steam pressure measuring point now Cumulative overpressure condition value S i And calculating the accumulated overpressure state value S of the high-temperature reheat steam pipeline till the current moment.
3. The method for calculating the overpressure condition of the high-temperature reheat steam line in real time as claimed in claim 2, wherein when the condition shown in formula (1) is satisfied, the unit is considered to be running and continuously running;
4. the method for calculating the overpressure condition of the high-temperature reheat steam pipeline in real time as claimed in claim 2, wherein when the condition shown in formula (2) is satisfied, the reheat steam pressure measuring point is considered to be not overpressure;
if RHP i (t now-1 )<PA∨RHP i (t now )<PA (2)。
5. the method for calculating the overpressure condition of the high-temperature reheat steam pipeline in real time as claimed in claim 2, wherein when the condition shown in formula (3) is satisfied, the overpressure condition of the reheat steam pressure measuring point is considered to be over-pressurized;
if RHP i (t now-1 )<PA∨RHP i (t now )>＝PA (3)。
6. the method for calculating the overpressure condition of the high-temperature reheat steam pipeline in real time as claimed in claim 2, wherein when the condition shown in formula (4) is satisfied, the reheat steam pressure measuring point is considered to be continuously overpressure;
if RHP i (t now-1 )>＝PA∨RHP i (t now )>＝PA (4)。
7. the method for calculating the overpressure condition of the high-temperature reheat steam pipeline in real time as claimed in claim 2, wherein when the condition shown in formula (5) is satisfied, the overpressure condition of the reheat steam pressure measuring point is considered to be over;
if RHP i (t now-1 )>＝PA∨RHP i (t now )<PA (5)。
8. the method for calculating the overpressure condition of a high temperature reheat steam line in real time as claimed in claim 2, wherein the current time t is now Single overpressure condition value S of previous reheat steam pressure measurement points i (t)：
Wherein, t start Overpressure start time, t, for a single overpressure event end The overpressure end time of the single overpressure process.
9. The method for calculating the overpressure condition of the high-temperature reheat steam pipeline in real time as claimed in claim 2, wherein each reheat steam pressure measuring point is cut to the current time t now Accumulated overpressure so farState value S i ：
Wherein, t 0 To calculate the initial time.
10. The method for calculating overpressure conditions of high temperature reheat steam line in real time as claimed in claim 2, wherein the accumulated overpressure condition value S of high temperature reheat steam line up to the present time is:
S＝max{S 1 ,S 2 ,S 3 ...,S i ...,S n } (8)。
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