CN114790920B - 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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- CN114790920B CN114790920B CN202210577094.3A CN202210577094A CN114790920B CN 114790920 B CN114790920 B CN 114790920B CN 202210577094 A CN202210577094 A CN 202210577094A CN 114790920 B CN114790920 B CN 114790920B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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Abstract
The invention discloses a method for calculating the overpressure state of a high-temperature reheat 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 a high-temperature reheat steam pipeline of a unit i The method comprises the steps of carrying out a first treatment on the surface of the 2) Acquiring the generation power at the previous time t now‑1 Real-time power P of (2) e (t now‑1 ) At the current time t now Real-time power P of (2) e (t now ) Judging whether the unit operates and continuously operates normally or not according to the method, and when the unit operates and continuously operates, turning to the step 3), otherwise turning to the step 1); 3) Confirm the current time t now Acquiring reheat steam pressure RHP of all reheat steam pressure measuring points in the single integral overpressure process i And (t) calculating an accumulated overpressure state value S of the high-temperature reheat steam pipeline from the point of time of calculation, wherein the overpressure state of the high-temperature reheat steam pipeline is represented by the accumulated overpressure state value S of the high-temperature reheat steam pipeline from the point of time of calculation, and the method can calculate the overpressure state of the high-temperature reheat steam pipeline 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 for all pipelines and accessory parts thereof in the process that steam which is subjected to partial work in a steam turbine is sent back to a boiler for heating again and returned back to the steam turbine for acting. The steam turbine medium-pressure cylinder comprises a cold high-temperature reheat steam pipeline from a steam turbine high-pressure cylinder steam outlet to a boiler reheater inlet, a high-temperature reheat steam pipeline from a reheater outlet to a steam turbine medium-pressure cylinder, a valve and a drainage device. The high-temperature reheat steam pipeline is subjected to a high-temperature and high-pressure service environment, and particularly a plurality of units put into production and service before and after 2000 years are operated for more than 10 ten thousand hours, so that the material performance is deteriorated, the operation working condition is bad, and the safety is very important.
Although the design unit gives proper design pressure and the specification of the pipe can consider the margin, in the service process, severe operation conditions and unstable factors still cause overpressure operation of the high-temperature reheat steam pipeline, under the dual effects of high temperature and internal pressure stress, the ageing of pipeline materials can be accelerated, stress concentration can be caused at the defect position or 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 joints 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 reheat steam pipeline can pass through the vicinity of the centralized control room, once leakage or failure occurs, serious safety accidents of personal casualties can be caused, and therefore, the real-time calculation of the overpressure state of the high-temperature reheat steam pipeline is very significant.
Therefore, the method for calculating the overpressure state of the high-temperature reheat steam pipeline in real time is provided, the overpressure state value is used for reflecting the actual overpressure state of the high-temperature reheat steam pipeline, operation and maintenance personnel can conveniently master the health state of the high-temperature reheat steam pipeline, and the safety of a unit is ensured.
Currently, only the literature 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 in published literature, such as literature 'optimization analysis of weld joint stress of the high-temperature reheat steam pipeline based on finite elements, 2021 (37)'; there are also reports of optimizing the pressure drop of 1000MW reheat steam system piping using us AFT fluid analysis and calculation software, providing the best piping selection specifications, such as literature "primary steam and reheat steam system pressure drop analysis studies in thermal power plants, 2017 (28)". However, no report is made on a method for calculating the overpressure state of the high-temperature reheat steam pipeline in real time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for calculating the overpressure state of a high-temperature reheat steam pipeline in real time.
In order to achieve the above purpose, the method for calculating the overpressure state of the high-temperature reheat steam pipeline in real time comprises the following steps:
1) Acquiring reheat steam pressure RHP of each reheat steam pressure measuring point on a high-temperature reheat steam pipeline of a unit i ；
2) Acquiring the generation power at the previous time t now-1 Real-time power P of (2) e (t now-1 ) At the current time t now Real-time power P of (2) e (t now ) Judging whether the unit operates and continuously operates normally or not according to the method, and when the unit operates and continuously operates, turning to the step 3), otherwise turning to the step 1);
3) Determining that each reheat steam pressure measuring point on a high-temperature reheat steam pipeline of a unit is at a previous time t now-1 Is the reheat steam pressure RHP of (C) i (t now-1 ) At the current time t now Is the reheat steam pressure RHP of (C) i (t now ) Judging the overpressure state of the reheat steam pressure measuring point according to the overpressure state, when the judging result is that the overpressure is not exceeded, the overpressure starts or the overpressure continues, turning to the step 1), and when the judging result is that the overpressure ends, turning to the step 4);
4) Confirm the current time t now Acquiring reheat steam pressure RHP of all reheat steam pressure measuring points in the single integral overpressure process i And (t) calculating the accumulated overpressure state value S of the high-temperature reheating steam pipeline until the calculation time, and representing the overpressure state of the high-temperature reheating steam pipeline by the accumulated overpressure state value S of the high-temperature reheating steam pipeline until the calculation time.
The specific operation of the step 4) is as follows:
41 Confirm the current time t now Acquiring reheat steam pressure RHP of all reheat steam pressure measuring points in the single overpressure process in the previous single integral overpressure process i (t) and thereby calculate the current time t now Single overpressure state value S of each previous reheat steam pressure measurement point i (t)；
42 According to the current time t) now Single overpressure state value S of each previous reheat steam pressure measurement point i (t) calculating the point of each reheat steam pressure measurement to the current time t now Cumulative overpressure state value S up to i ；
43 According to the point of each reheat steam pressure measuring point to the current time t now Cumulative overpressure state value S up to i And calculating the accumulated overpressure state value S of the high-temperature reheat steam pipeline till the current moment.
When the condition shown in the formula (1) is satisfied, the unit is considered to run and continuously runs;
when the condition shown in the formula (2) is satisfied, the reheat steam pressure measuring point is considered to be not overpressurized;
if RHP i (t now-1 )<PA∨RHP i (t now )<PA (2)。
when the condition shown in the formula (3) is satisfied, the reheat steam pressure measuring point is considered to start overpressure;
if RHP i (t now-1 )<PA∨RHP i (t now )>＝PA (3)。
when the condition shown in the formula (4) is satisfied, the reheat steam pressure measuring point is considered to continuously superpressure;
if RHP i (t now-1 )>＝PA∨RHP i (t now )>＝PA (4)。
when the condition shown in the formula (5) is satisfied, the overpressure of the reheat steam pressure measuring point is considered to be ended;
if RHP i (t now-1 )>＝PA∨RHP i (t now )<PA (5)。
at the current time t now Single overpressure state value S of each previous reheat steam pressure measurement point i (t)：
Wherein t is start An overpressure start time, t, for a single overpressure procedure end Is the overpressure end time of a single overpressure procedure.
Each reheat steam pressure measuring point is cut to the current time t now Cumulative overpressure state value S up to i ：
Wherein t is 0 To calculate the initial time, t now Is the current time.
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 line has n reheat steam pressure measurement points.
The invention has the following beneficial effects:
when the method for calculating the overpressure state of the high-temperature reheat steam pipeline in real time is specifically operated, the unit operation judgment is carried out by acquiring the real-time power generation power value of the unit operation state parameter, the overpressure judgment is carried out on each reheat steam pressure measuring point value in real time, the single overpressure state value of each reheat steam pressure measuring point is calculated in real time according to the complete single overpressure process, the accumulated overpressure state value of each reheat steam pressure measuring point is calculated in real time by expanding in time, and finally the accumulated overpressure state value of the high-temperature reheat steam pipeline is calculated in real time based on a plurality of reheat steam pressure measuring points. The overpressure state of the high-temperature reheat steam pipeline is represented by the overpressure state value, and technical support is provided for operation assessment and unit supervision of power plant operation and maintenance technicians.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 shows the confirmation of the current time t now A single complete overpressure process map.
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 and 2, the method for calculating the overpressure state of the high-temperature reheat steam pipe in real time according to the present invention includes the following steps:
1) Determining a computing object
No matter how the high-temperature reheat steam pipeline of the thermal power plant is arranged and oriented, the calculation object is the high-temperature reheat steam pipeline of the unit.
2) Determining overpressure alarm value
And determining an overpressure alarm value PA of the reheat steam pressure of the high-temperature reheat steam pipeline according to the operation rules.
3) Determining calculation related parameters
The calculation related parameters comprise overpressure calculation parameters and unit operation state parameters.
Wherein, the overpressure calculation parameter is reheat steam pressure RHP, when a plurality of reheat steam pressure measuring points exist, the reheat steam pressure RHP is distinguished by using a right lower corner mark i, and each reheat steam pressure RHP i All participate in the real-time computation.
The unit running state parameters comprise real-time power P e Capacity P of installation e0 。
4) Start computing and acquire real-time data
From the current time t now Starting calculation and acquiring reheat steam pressure RHP of each reheat steam pressure measuring point i Turning to step 5);
5) Unit operation judgment
Acquiring the generation power at the previous time t now-1 Real-time power P of (2) e (t now-1 ) At the current time t now Real-time power P of (2) e (t now ) Judging whether the unit operates normally or not continuously according to the method;
when the condition shown in the formula (1) is met, the unit is considered to run and continuously run, and the step 6) is switched to, otherwise, the unit is considered to stop or start to stop, and the step 4) is switched to;
6) Measurement point overpressure judgment
Acquiring each reheat steam pressure measuring point at the previous time t now-1 Is the reheat steam pressure RHP of (C) i (t now-1 ) At the current time t now Is the reheat steam pressure RHP of (C) i (t now ) And judging the overpressure according to the above.
When the condition shown in the formula (2) is satisfied, the reheat steam pressure measuring point is considered to be not overpressured, and 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 start 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 overpressurized, and the process continues to the step (4);
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 over, and the process goes to the step (7);
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
After the overpressure of the reheat steam pressure measuring point is over, the current time t is confirmed now The previous single complete overpressure process (as shown in fig. 2), and the reheat steam pressure RHP of all reheat steam pressure measuring points in the single overpressure process is obtained i (t) and calculating the current time t in real time according to the formula (6) now Single overpressure state value S of each previous reheat steam pressure measurement point i (t)：
Wherein t is start An overpressure start time, t, for a single overpressure procedure end Is the overpressure end time of a single overpressure procedure.
Expanding the statistical time, and calculating the time of each reheat steam pressure measuring point to the current time t according to the step (7) now Cumulative overpressure state value S up to i ：
Wherein t is 0 To calculate the initial time, t now Is the current time.
8) Calculating an accumulated overpressure state value S of the high-temperature reheat steam pipeline until the current moment in real 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 until the current moment;
according to the time t from each reheat steam pressure measuring point to the current time t now Cumulative overpressure state value S up to i And calculating the accumulated overpressure state value S of the high-temperature reheat steam pipeline until the current moment according to the formula (8) as follows:
S＝max{S 1 ,S 2 ,S 3 ...,S i ...,S n } (8)
wherein i represents that the high temperature reheat steam line has n reheat steam pressure measurement points.
Finally, the real-time calculation is completed, the single overpressure state value of the reheat steam pressure measuring point, the accumulated overpressure state value until the current moment and the accumulated overpressure state value of the high-temperature reheat steam pipeline until the current moment are written into a database, the calculation of the round is finished, and the calculation is switched to 4) to start a new round.
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 (4)
1. A method for calculating the overpressure condition of a high-temperature reheat steam line in real time, comprising the steps of:
1) Obtaining each reheat steam on a high-temperature reheat steam pipeline of a unitReheat steam pressure RHP of steam pressure measuring point i ；
2) Acquiring the generation power at the previous time t now-1 Real-time power P of (2) e (t now-1 ) At the current time t now Real-time power P of (2) e (t now ) Judging whether the unit operates and continuously operates normally or not according to the method, and when the unit operates and continuously operates, turning to the step 3), otherwise turning to the step 1);
3) Determining that each reheat steam pressure measuring point on a high-temperature reheat steam pipeline of a unit is at a previous time t now-1 Is the reheat steam pressure RHP of (C) i (t now-1 ) At the current time t now Is the reheat steam pressure RHP of (C) i (t now ) Judging the overpressure state of the reheat steam pressure measuring point according to the overpressure state, when the judging result is that the overpressure is not exceeded, the overpressure starts or the overpressure continues, turning to the step 1), and when the judging result is that the overpressure ends, turning to the step 4);
4) Confirm the current time t now Acquiring reheat steam pressure RHP of all reheat steam pressure measuring points in the single integral overpressure process i And (t) calculating the accumulated overpressure state value S of the high-temperature reheating steam pipeline until the calculation time, and representing the overpressure state of the high-temperature reheating steam pipeline by the accumulated overpressure state value S of the high-temperature reheating steam pipeline until the calculation time.
2. The method for calculating the overpressure condition of the high-temperature reheat steam line in real time according to claim 1, wherein the specific operation of the step 4) is as follows:
41 Confirm the current time t now Acquiring reheat steam pressure RHP of all reheat steam pressure measuring points in the single overpressure process in the previous single integral overpressure process i (t) and thereby calculate the current time t n o w Single overpressure state value S of each previous reheat steam pressure measurement point i (t)；
42 According to the current time t) now Single overpressure state value S of each previous reheat steam pressure measurement point i (t) calculating the reheat steamsThe steam pressure measuring point is at the current time t n o w Cumulative overpressure state value S up to i ；
43 According to the point of each reheat steam pressure measuring point to the current time t now Cumulative overpressure state value S up to 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 state of the high-temperature reheat steam pipe in real time according to claim 2, wherein each reheat steam pressure measurement point is up to a current time t now Cumulative overpressure state value S up to i ：
Wherein t is 0 To calculate the initial time, where t start An overpressure start time, t, for a single overpressure procedure end Is the overpressure end time of a single overpressure procedure.
4. The method for calculating the overpressure state of the high-temperature reheat steam pipe in real time according to claim 2, wherein the accumulated overpressure state value S of the high-temperature reheat steam pipe up to the present moment is:
S＝max{S 1 ,S 2 ,S 3 ...,S i ...,S n }。
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