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 PDF

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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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reheat steam
overpressure
now
steam pressure
high temperature
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CN114790920B (en
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王大鹏
杜保华
吴智群
杨永军
吕佩哲
王博
柴胜凯
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Xian Thermal Power Research Institute Co Ltd
Xian TPRI Power Station Information Technology Co Ltd
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Xian TPRI Power Station Information Technology Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-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

一种实时计算高温再热蒸汽管道超压状态的方法A method for real-time calculation of overpressure state of high temperature reheat steam pipeline

技术领域technical field

本发明属于火力发电行业技术领域,具体涉及一种实时计算高温再热蒸汽管道超压状态的方法。The invention belongs to the technical field of thermal power generation industry, and particularly relates to a method for calculating the overpressure state of a high-temperature reheat steam pipeline in real time.

背景技术Background technique

火力发电厂再热蒸汽系统是将是在汽轮机中做了一部分功的蒸汽送回锅炉再一次加热、重新回到汽轮机做功的过程中的全部管道及其附属部件的总称。它是由从汽轮机高压缸排汽口至锅炉再热器进口的冷高温再热蒸汽管道、从再热器出口至汽轮机中压汽缸的高温再热蒸汽管道、阀门、疏水装置所组成。其中的高温再热蒸汽管道,由于经受高温高压的服役环境,特别是许多2000年前后投产服役的机组已运行超过10万小时,材料性能劣化、运行工况恶劣,其安全性至关重要。The reheat steam system of a thermal power plant is a general term for all the pipes and their ancillary components in the process of returning the steam that has done part of the work in the steam turbine to the boiler for reheating and returning to the steam turbine to do work. It is composed of the cold and high temperature reheat steam pipeline from the steam outlet of the steam turbine high pressure cylinder to the inlet of the boiler reheater, the high temperature reheat steam pipeline from the reheater outlet to the steam turbine medium pressure cylinder, the valve and the drain device. Among them, the high-temperature reheat steam pipeline is subjected to high-temperature and high-pressure service environment, especially many units put into operation around 2000 have been running for more than 100,000 hours, the material properties are deteriorated, and the operating conditions are harsh, and its safety is very important.

虽然设计单位会给出合适的设计压力,管材规格也会考虑裕度,但是在服役过程中,恶劣运行工况、不稳定因素仍会造成高温再热蒸汽管道超压运行,在高温、内压应力的双重作用下,不仅会加速管道材质老化,而且会在缺陷处造成应力集中或在裂纹处引发裂纹扩展导致失效,特别是在弯管段、三通与直管段焊缝处,因超压引起的泄露或失效概率成指数增高。Although the design unit will give the appropriate design pressure, and the pipe specification will also consider the margin, during the service process, severe operating conditions and unstable factors will still cause the high-temperature reheated steam pipeline to operate under overpressure. Under the dual action of stress, it will not only accelerate the aging of the pipe material, but also cause stress concentration at the defect or cause the crack to expand at the crack, resulting in failure. The resulting probability of leakage or failure increases exponentially.

此外,由于高温再热蒸汽管道的布置会经过集控室附近,一旦发生泄露或失效,会引发人身伤亡的重大安全事故,因此对高温再热蒸汽管道超压状态的实时计算是十分有意义的。In addition, because the arrangement of the high-temperature reheat steam pipeline will pass near the centralized control room, once leakage or failure occurs, it will lead to a major safety accident of personal injury and death. Therefore, the real-time calculation of the overpressure state of the high-temperature reheat steam pipeline is very meaningful.

为此,提出了一种实时计算高温再热蒸汽管道超压状态的方法,用超压状态值来反应高温再热蒸汽管道的超压实际状况,方便运行和检修人员掌握高温再热蒸汽管道的健康状况,保证机组的安全性。To this end, a method for real-time calculation of the overpressure state of the high temperature reheat steam pipeline is proposed, and the overpressure state value is used to reflect the actual overpressure state of the high temperature reheat steam pipeline, which is convenient for the operation and maintenance personnel to grasp the high temperature reheat steam pipeline. Health status to ensure the safety of the unit.

目前,在已发表的文献中,仅有文献报道基于有限元应力分析法,对高温再热蒸汽管道焊缝处应力分布进行合理计算,如文献“基于有限元的高温再热蒸汽管道焊缝应力优化分析,2021(37)”;也有文献报道采用美国AFT流体分析计算软件,对1000MW的再热蒸汽系统管道的压降进行优化,提出最佳的管道选择规格,如文献“火电厂主蒸汽和再热蒸汽系统压降分析研究,2017(28)”。但针对实时计算高温再热蒸汽管道超压状态的方法未见报道。At present, in the published literature, only the literature reports that based on the finite element stress analysis method, the stress distribution at the weld of high temperature reheat steam pipeline is reasonably calculated. Optimization Analysis, 2021(37)"; there are also literature reports that the pressure drop of the 1000MW reheat steam system pipeline is optimized by using the American AFT fluid analysis and calculation software, and the best pipeline selection specifications are proposed, such as the literature "The main steam and Analysis of Pressure Drop in Reheat Steam System, 2017(28)”. However, there is no report on the method of real-time calculation of the overpressure state of the high temperature reheat steam pipeline.

发明内容SUMMARY OF THE INVENTION

本发明的目的在于克服上述现有技术的缺点,提供了一种实时计算高温再热蒸汽管道超压状态的方法,该方法能够实时计算高温再热蒸汽管道的超压状态。The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and to provide a real-time calculation method for the overpressure state of the high temperature reheat steam pipeline, which can calculate the overpressure state of the high temperature reheat steam pipeline in real time.

为达到上述目的,本发明所述的实时计算高温再热蒸汽管道超压状态的方法包括以下步骤:In order to achieve the above object, the method for calculating the overpressure state of a high temperature reheat steam pipeline in real time according to the present invention comprises the following steps:

1)获取机组的高温再热蒸汽管道上各再热蒸汽压力测点的再热蒸汽压力RHPi1) obtain the reheat steam pressure RHP i of each reheat steam pressure measuring point on the high temperature reheat steam pipeline of the unit;

2)获取发电功率在前一时刻tnow-1的实时发电功率Pe(tnow-1)及当前时刻tnow的实时发电功率Pe(tnow),并以此判断机组运行且持续运行是否正常,当机组运行且持续运行时,则转至步骤3),否则,则转至步骤1);2) Obtain the real-time generation power P e (t now-1 ) of the generation power at the previous time t now-1 and the real-time generation power P e (t now ) at the current time t now , and use this to judge that the unit is running and continues to run Whether it is normal, when the unit is running and continues to run, go to step 3), otherwise, go to step 1);

3)确定机组的高温再热蒸汽管道上各再热蒸汽压力测点在前一时刻tnow-1的再热蒸汽压力RHPi(tnow-1)以及当前时刻tnow的再热蒸汽压力RHPi(tnow),并以此判断再热蒸汽压力测点的超压状态,当判断结果为未超压、开始超压或持续超压时,则转至步骤1),当判断结果为超压结束时,则转至步骤4);3) Determine the reheat steam pressure RHP i (t now-1 ) of each reheat steam pressure measuring point on the high temperature reheat steam pipeline of the unit at the previous time t now-1 and the reheat steam pressure RHP at the current time t now i (t now ), and judge the overpressure state of the reheat steam pressure measurement point based on this, when the judgment result is no overpressure, starting overpressure or continuous overpressure, then go to step 1), when the judgment result is overpressure When the pressure is over, go to step 4);

4)确认当前时刻tnow之前的单次完整超压过程,获取单次完整超压过程中所有再热蒸汽压力测点的再热蒸汽压力RHPi(t),并以此计算高温再热蒸汽管道截至计算时刻为止的累计超压状态值S,通过高温再热蒸汽管道截至计算时刻为止的累计超压状态值S表征高温再热蒸汽管道的超压状态。4) Confirm the single complete overpressure process before the current time t now , obtain the reheat steam pressure RHP i (t) of all reheat steam pressure measurement points in the single complete overpressure process, and use this to calculate the high temperature reheat steam The accumulated overpressure state value S of the pipeline up to the calculation time, and 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 up to the calculation time.

步骤4)的具体操作为:The specific operation of step 4) is:

41)确认当前时刻tnow之前的单次完整超压过程,获取单次超压过程中所有再热蒸汽压力测点的再热蒸汽压力RHPi(t),并以此计算当前时刻tnow之前的各再热蒸汽压力测点的单次超压状态值Si(t);41) Confirm the single complete overpressure process before the current time t now , obtain the reheat steam pressure RHP i (t) of all the reheat steam pressure measuring points in the single overpressure process, and use this to calculate the time before the current time t now The single overpressure state value S i (t) of each reheat steam pressure measuring point;

42)根据当前时刻tnow之前的各再热蒸汽压力测点的单次超压状态值Si(t)计算各再热蒸汽压力测点截至当前时刻tnow为止的累计超压状态值Si42) According to the single overpressure state value S i (t) of each reheat steam pressure measurement point before the current time t now , calculate the cumulative overpressure state value S i of each reheat steam pressure measurement point up to the current time t now ;

43)根据各再热蒸汽压力测点截至当前时刻tnow为止的累计超压状态值Si,计算高温再热蒸汽管道截至当前时刻为止的累计超压状态值S。43) Calculate the accumulated overpressure state value S of the high temperature reheat steam pipeline as of the current time according to the accumulated overpressure state value S i of each reheat steam pressure measurement point as of the current time tnow .

当满足式(1)所示条件时,则认为机组运行且持续运行;When the conditions shown in formula (1) are satisfied, the unit is considered to be running and running continuously;

Figure BDA0003662603660000031
Figure BDA0003662603660000031

当满足式(2)所示条件时,则认为再热蒸汽压力测点未超压;When the conditions shown in formula (2) are satisfied, it is considered that the reheat steam pressure measuring point is not overpressured;

if RHPi(tnow-1)<PA∨RHPi(tnow)<PA (2)。if RHP i (t now-1 )<PA∨RHP i (t now )<PA (2).

当满足式(3)所示条件时,则认为再热蒸汽压力测点开始超压;When the conditions shown in formula (3) are satisfied, it is considered that the reheat steam pressure measurement point begins to overpressure;

if RHPi(tnow-1)<PA∨RHPi(tnow)>=PA (3)。if RHP i (t now-1 )<PA∨RHP i (t now )>=PA (3).

当满足式(4)所示条件时,则认为再热蒸汽压力测点持续超压;When the conditions shown in formula (4) are satisfied, the reheat steam pressure measurement point is considered to be continuously overpressured;

if RHPi(tnow-1)>=PA∨RHPi(tnow)>=PA (4)。if RHP i (t now-1 )>=PA∨RHP i (t now )>=PA (4).

当满足式(5)所示条件时,则认为再热蒸汽压力测点超压结束;When the conditions shown in formula (5) are satisfied, it is considered that the overpressure of the reheat steam pressure measuring point is over;

if RHPi(tnow-1)>=PA∨RHPi(tnow)<PA (5)。if RHP i (t now-1 )>=PA∨RHP i (t now )<PA (5).

当前时刻tnow之前的各再热蒸汽压力测点的单次超压状态值Si(t):The single overpressure state value S i (t) of each reheat steam pressure measurement point before the current time t now :

Figure BDA0003662603660000041
Figure BDA0003662603660000041

其中,tstart为单次超压过程的超压开始时间,tend为单次超压过程的超压结束时间。Among them, t start is the overpressure start time of a single overpressure process, and tend is the overpressure end time of a single overpressure process.

各再热蒸汽压力测点截至当前时刻tnow为止的累计超压状态值SiThe accumulated overpressure state value S i of each reheat steam pressure measurement point up to the current time t now :

Figure BDA0003662603660000042
Figure BDA0003662603660000042

其中,t0为计算最初时间,tnow为当前时刻时间。Among them, t 0 is the initial time of calculation, and t now is the current time.

高温再热蒸汽管道截至当前时刻为止的累计超压状态值S为:The accumulated overpressure state value S of the high temperature reheat steam pipeline up to the current time is:

S=max{S1,S2,S3...,Si...,Sn} (8)S=max{S 1 ,S 2 ,S 3 ...,S i ...,S n } (8)

其中,i表示高温再热蒸汽管道有n个再热蒸汽压力测点。Among them, i indicates that the high temperature reheat steam pipeline has n reheat steam pressure measuring points.

本发明具有以下有益效果:The present invention has the following beneficial effects:

本发明所述的实时计算高温再热蒸汽管道超压状态的方法在具体操作时,通过获取机组运行状态参数实时发电功率值进行机组运行判断,实时对每个再热蒸汽压力测点值进行超压判断,根据完整的单次超压过程中,针对各再热蒸汽压力测点实时计算其单次超压状态值,并在时间上扩展针对各再热蒸汽压力测点实时计算其累次超压状态值,最终基于多个再热蒸汽压力测点实时计算高温再热蒸汽管道的累计超压状态值。通过超压状态值来表征高温再热蒸汽管道的超压状态,为电厂运行和检修技术人员开展运行考核、机组监督提供技术支持。The method for calculating the overpressure state of a high-temperature reheat steam pipeline in real time according to the present invention is, during specific operation, by obtaining the real-time power generation power value of the unit operating state parameter to judge the unit operation, and performing the overpressure measurement of each reheat steam pressure measurement point value in real time. According to the complete single overpressure process, the single overpressure state value is calculated in real time for each reheat steam pressure measurement point, and the cumulative overpressure is calculated in real time for each reheat steam pressure measurement point in time. Finally, based on multiple reheat steam pressure measurement points, the accumulated overpressure state value of the high temperature reheat steam pipeline is calculated in real time. The overpressure state of the high temperature reheat steam pipeline is characterized by the overpressure state value, which provides technical support for the power plant operation and maintenance technicians to carry out operation assessment and unit supervision.

附图说明Description of drawings

图1为本发明的流程图。FIG. 1 is a flow chart of the present invention.

图2为确认当前时刻tnow前单次完整超压过程图。FIG. 2 is a diagram showing a single complete overpressure process before the current time t now is confirmed.

具体实施方式Detailed ways

为了使本技术领域的人员更好地理解本发明方案,下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分的实施例,不是全部的实施例,而并非要限制本发明公开的范围。此外,在以下说明中,省略了对公知结构和技术的描述,以避免不必要的混淆本发明公开的概念。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都应当属于本发明保护的范围。In order to make those skilled in the art better understand the 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only The embodiments are part of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

在附图中示出了根据本发明公开实施例的结构示意图。这些图并非是按比例绘制的,其中为了清楚表达的目的,放大了某些细节,并且可能省略了某些细节。图中所示出的各种区域、层的形状及它们之间的相对大小、位置关系仅是示例性的,实际中可能由于制造公差或技术限制而有所偏差,并且本领域技术人员根据实际所需可以另外设计具有不同形状、大小、相对位置的区域/层。The accompanying drawings show a schematic structural diagram of an embodiment according to the disclosure of the present invention. The figures are not to scale, some details have been exaggerated for clarity, and some details may have been omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are only exemplary, and in practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art should Regions/layers with different shapes, sizes, relative positions can be additionally designed as desired.

参考图1和图2,本发明所述的实时计算高温再热蒸汽管道超压状态的方法包括以下步骤:1 and 2, the method for calculating the overpressure state of a high temperature reheat steam pipeline in real time according to the present invention includes the following steps:

1)确定计算对象1) Determine the calculation object

无论火力发电厂高温再热蒸汽管道如何布置和走向,计算对象均为机组的高温再热蒸汽管道。No matter how the high temperature reheat steam pipeline of thermal power plant is arranged and the direction, the calculation object is the high temperature reheat steam pipeline of the unit.

2)确定超压报警值2) Determine the overpressure alarm value

根据运行规程确定高温再热蒸汽管道再热蒸汽压力的超压报警值PA。Determine the overpressure alarm value PA of the reheat steam pressure of the high temperature reheat steam pipeline according to the operation regulations.

3)确定计算相关参数3) Determine the relevant parameters of the calculation

计算相关参数包括超压计算参数及机组运行状态参数。Calculation-related parameters include overpressure calculation parameters and unit operating state parameters.

其中,超压计算参数为再热蒸汽压力RHP,当存在多个再热蒸汽压力测点时,则使用右下角标i区分,各再热蒸汽压力RHPi均参与实时计算。Among them, the overpressure calculation parameter is the reheat steam pressure RHP. When there are multiple reheat steam pressure measurement points, the subscript i in the lower right corner is used to distinguish, and each reheat steam pressure RHP i participates in the real-time calculation.

机组运行状态参数包括实时发电功率Pe及装机容量Pe0The operating state parameters of the unit include real-time power generation P e and installed capacity P e0 .

4)开始计算并获取实时数据4) Start calculation and get real-time data

从当前时刻tnow开始计算,获取各再热蒸汽压力测点的再热蒸汽压力RHPi,再转至步骤5);Calculate from the current time t now , obtain the reheat steam pressure RHP i of each reheat steam pressure measurement point, and then go to step 5);

5)机组运行判断5) Judgment of unit operation

获取发电功率在前一时刻tnow-1的实时发电功率Pe(tnow-1)及当前时刻tnow的实时发电功率Pe(tnow),并以此判断机组运行且持续运行是否正常;Obtain the real-time power generation P e (t now-1 ) of the generated power at the previous time t now-1 and the real-time power generation P e (t now ) at the current time t now , and judge whether the unit is running and continues to run normally. ;

其中,当满足式(1)所示条件时,认为机组运行且持续运行,则转至步骤6),否则,认为机组停机或启停机运行,则转至步骤4);Wherein, when the condition shown in formula (1) is satisfied, it is considered that the unit is running and continues to operate, then go to step 6), otherwise, it is considered that the unit is shut down or running, then go to step 4);

Figure BDA0003662603660000061
Figure BDA0003662603660000061

6)测点超压判断6) Judgment of overpressure at the measuring point

获取各再热蒸汽压力测点在前一时刻tnow-1的再热蒸汽压力RHPi(tnow-1)以及当前时刻tnow的再热蒸汽压力RHPi(tnow),并以此进行超压判断。Obtain the reheat steam pressure RHP i (t now-1 ) of each reheat steam pressure measurement point at the previous time t now-1 and the reheat steam pressure RHP i (t now ) at the current time t now , and proceed accordingly Overpressure judgment.

当满足式(2)所示条件时,认为再热蒸汽压力测点未超压,则转至步骤4);When the condition shown in formula (2) is satisfied, it is considered that the reheat steam pressure measuring point is not overpressured, then go to step 4);

if RHPi(tnow-1)<PA∨RHPi(tnow)<PA (2)if RHP i (t now-1 )<PA∨RHP i (t now )<PA (2)

当满足式(3)所示条件时,认为再热蒸汽压力测点开始超压,则转至步骤4);When the condition shown in formula (3) is satisfied, it is considered that the reheat steam pressure measuring point starts to overpressure, then go to step 4);

if RHPi(tnow-1)<PA∨RHPi(tnow)>=PA (3)if RHP i (t now-1 )<PA∨RHP i (t now )>=PA (3)

当满足式(4)所示条件时,认为再热蒸汽压力测点持续超压,则继续转至步骤4);When the condition shown in formula (4) is satisfied, it is considered that the reheat steam pressure measurement point continues to be overpressured, and then continue to step 4);

if RHPi(tnow-1)>=PA∨RHPi(tnow)>=PA (4)if RHP i (t now-1 )>=PA∨RHP i (t now )>=PA (4)

当满足式(5)所示条件时,认为再热蒸汽压力测点超压结束,则转至步骤7);When the condition shown in formula (5) is satisfied, it is considered that the overpressure of the reheat steam pressure measuring point is over, and then go to step 7);

if RHPi(tnow-1)>=PA∨RHPi(tnow)<PA (5)if RHP i (t now-1 )>=PA∨RHP i (t now )<PA (5)

7)测点单次超压状态值及累计超压状态值的实时计算7) Real-time calculation of single overpressure state value and accumulated overpressure state value of measuring point

当再热蒸汽压力测点超压结束后,确认当前时刻tnow之前的单次完整超压过程(如图2所示),获取单次超压过程中所有再热蒸汽压力测点的再热蒸汽压力RHPi(t),并按照式(6)实时计算当前时刻tnow之前的各再热蒸汽压力测点的单次超压状态值Si(t):When the overpressure of the reheated steam pressure measuring point ends, confirm the single complete overpressure process before the current time t now (as shown in Figure 2), and obtain the reheating of all the reheated steam pressure measuring points during the single overpressure process steam pressure RHP i (t), and calculate in real time the single overpressure state value S i (t) of each reheat steam pressure measurement point before the current time t now according to formula (6):

Figure BDA0003662603660000071
Figure BDA0003662603660000071

其中,tstart为单次超压过程的超压开始时间,tend为单次超压过程的超压结束时间。Among them, t start is the overpressure start time of a single overpressure process, and tend is the overpressure end time of a single overpressure process.

将统计时间扩展,并按照式(7)实时计算各再热蒸汽压力测点截至当前时刻tnow为止的累计超压状态值SiExtend the statistical time, and calculate in real time the accumulated overpressure state value S i of each reheat steam pressure measurement point up to the current time t now according to formula (7):

Figure BDA0003662603660000081
Figure BDA0003662603660000081

其中,t0为计算最初时间,tnow为当前时刻时间。Among them, t 0 is the initial time of calculation, and t now is the current time.

8)实时计算高温再热蒸汽管道截至当前时刻为止的累计超压状态值S,通过高温再热蒸汽管道截至当前时刻为止的累计超压状态值S表征高温再热蒸汽管道的超压状态;8) Calculate the cumulative overpressure state value S of the high temperature reheat steam pipeline up to the current moment in real time, and represent the overpressure status of the high temperature reheat steam pipeline by the cumulative overpressure status value S of the high temperature reheat steam pipeline up to the current moment;

根据各再热蒸汽压力测点截至当前时刻tnow为止的累计超压状态值Si,并根据式(8)计算高温再热蒸汽管道截至当前时刻为止的累计超压状态值S为:According to the accumulated overpressure state value S i of each reheat steam pressure measurement point up to the current time t now , and according to formula (8), the accumulated overpressure state value S of the high-temperature reheat steam pipeline up to the current time is calculated as:

S=max{S1,S2,S3...,Si...,Sn} (8)S=max{S 1 ,S 2 ,S 3 ...,S i ...,S n } (8)

其中,i表示高温再热蒸汽管道有n个再热蒸汽压力测点。Among them, i indicates that the high temperature reheat steam pipeline has n reheat steam pressure measuring points.

最终,实时计算完成,将再热蒸汽压力测点单次超压状态值和截至当前时刻为止的累计超压状态值、以及高温再热蒸汽管道截至当前时刻为止的累计超压状态值写入数据库,结束本轮计算,转至4)开始新一轮计算。Finally, the real-time calculation is completed, and the single overpressure state value of the reheat steam pressure measurement point, the accumulated overpressure state value up to the current time, and the accumulated overpressure state value of the high-temperature reheat steam pipeline up to the current time are written into the database. , end this round of calculation, go to 4) to start a new round of calculation.

上述实施例仅仅是能够实现本发明技术方案的实施方式之一,本发明所要求保护的范围并不仅仅受本实施例的限制,还包括在本发明所公开的技术范围内,任何熟悉本技术领域的技术人员所容易想到的变化、替换及其他实施方式。The above-mentioned embodiment is only one of the embodiments that can realize the technical solution of the present invention. The scope of protection claimed in the present invention is not only limited by this embodiment, but also included in the technical scope disclosed in the present invention. Anyone familiar with the present technology Variations, substitutions, and other implementations will readily occur to those skilled in the art.

Claims (10)

1.一种实时计算高温再热蒸汽管道超压状态的方法,其特征在于,包括以下步骤:1. a method for calculating high temperature reheat steam pipeline overpressure state in real time, is characterized in that, comprises the following steps: 1)获取机组的高温再热蒸汽管道上各再热蒸汽压力测点的再热蒸汽压力RHPi1) obtain the reheat steam pressure RHP i of each reheat steam pressure measuring point on the high temperature reheat steam pipeline of the unit; 2)获取发电功率在前一时刻tnow-1的实时发电功率Pe(tnow-1)及当前时刻tnow的实时发电功率Pe(tnow),并以此判断机组运行且持续运行是否正常,当机组运行且持续运行时,则转至步骤3),否则,则转至步骤1);2) Obtain the real-time generation power P e (t now-1 ) of the generation power at the previous time t now-1 and the real-time generation power P e (t now ) at the current time t now , and use this to judge that the unit is running and continues to run Whether it is normal, when the unit is running and continues to run, go to step 3), otherwise, go to step 1); 3)确定机组的高温再热蒸汽管道上各再热蒸汽压力测点在前一时刻tnow-1的再热蒸汽压力RHPi(tnow-1)以及当前时刻tnow的再热蒸汽压力RHPi(tnow),并以此判断再热蒸汽压力测点的超压状态,当判断结果为未超压、开始超压或持续超压时,则转至步骤1),当判断结果为超压结束时,则转至步骤4);3) Determine the reheat steam pressure RHP i (t now-1 ) of each reheat steam pressure measuring point on the high temperature reheat steam pipeline of the unit at the previous time t now-1 and the reheat steam pressure RHP at the current time t now i (t now ), and judge the overpressure state of the reheat steam pressure measurement point based on this, when the judgment result is no overpressure, starting overpressure or continuous overpressure, then go to step 1), when the judgment result is overpressure When the pressure is over, go to step 4); 4)确认当前时刻tnow之前的单次完整超压过程,获取单次完整超压过程中所有再热蒸汽压力测点的再热蒸汽压力RHPi(t),并以此计算高温再热蒸汽管道截至计算时刻为止的累计超压状态值S,通过高温再热蒸汽管道截至计算时刻为止的累计超压状态值S表征高温再热蒸汽管道的超压状态。4) Confirm the single complete overpressure process before the current time t now , obtain the reheat steam pressure RHP i (t) of all reheat steam pressure measurement points in the single complete overpressure process, and use this to calculate the high temperature reheat steam The accumulated overpressure state value S of the pipeline up to the calculation time, and 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 up to the calculation time. 2.根据权利要求1所述的实时计算高温再热蒸汽管道超压状态的方法,其特征在于,步骤4)的具体操作为:2. the method for calculating high temperature reheat steam pipeline overpressure state in real time according to claim 1, is characterized in that, the concrete operation of step 4) is: 41)确认当前时刻tnow之前的单次完整超压过程,获取单次超压过程中所有再热蒸汽压力测点的再热蒸汽压力RHPi(t),并以此计算当前时刻tnow之前的各再热蒸汽压力测点的单次超压状态值Si(t);41) Confirm the single complete overpressure process before the current time t now , obtain the reheat steam pressure RHP i (t) of all the reheat steam pressure measuring points in the single overpressure process, and use this to calculate the time before the current time t now The single overpressure state value S i (t) of each reheat steam pressure measuring point; 42)根据当前时刻tnow之前的各再热蒸汽压力测点的单次超压状态值Si(t)计算各再热蒸汽压力测点截至当前时刻tnow为止的累计超压状态值Si42) According to the single overpressure state value S i (t) of each reheat steam pressure measurement point before the current time t now , calculate the cumulative overpressure state value S i of each reheat steam pressure measurement point up to the current time t now ; 43)根据各再热蒸汽压力测点截至当前时刻tnow为止的累计超压状态值Si,计算高温再热蒸汽管道截至当前时刻为止的累计超压状态值S。43) Calculate the accumulated overpressure state value S of the high temperature reheat steam pipeline as of the current time according to the accumulated overpressure state value S i of each reheat steam pressure measurement point as of the current time tnow . 3.根据权利要求2所述的实时计算高温再热蒸汽管道超压状态的方法,其特征在于,当满足式(1)所示条件时,则认为机组运行且持续运行;3. the method for calculating the overpressure state of high temperature reheat steam pipeline in real time according to claim 2, is characterized in that, when satisfying the condition shown in formula (1), then consider that the unit operates and continues to operate;
Figure FDA0003662603650000021
Figure FDA0003662603650000021
4.根据权利要求2所述的实时计算高温再热蒸汽管道超压状态的方法,其特征在于,当满足式(2)所示条件时,则认为再热蒸汽压力测点未超压;4. the method for calculating high temperature reheat steam pipeline overpressure state in real time according to claim 2, is characterized in that, when satisfying the condition shown in formula (2), then think that the reheat steam pressure measuring point is not overpressured; if RHPi(tnow-1)<PA∨RHPi(tnow)<PA (2)。if RHP i (t now-1 )<PA∨RHP i (t now )<PA (2). 5.根据权利要求2所述的实时计算高温再热蒸汽管道超压状态的方法,其特征在于,当满足式(3)所示条件时,则认为再热蒸汽压力测点开始超压;5. the method for calculating high temperature reheat steam pipeline overpressure state in real time according to claim 2, is characterized in that, when satisfying the condition shown in formula (3), then think that the reheat steam pressure measuring point starts overpressure; if RHPi(tnow-1)<PA∨RHPi(tnow)>=PA (3)。if RHP i (t now-1 )<PA∨RHP i (t now )>=PA (3). 6.根据权利要求2所述的实时计算高温再热蒸汽管道超压状态的方法,其特征在于,当满足式(4)所示条件时,则认为再热蒸汽压力测点持续超压;6. the method for real-time calculation of high temperature reheat steam pipeline overpressure state according to claim 2, is characterized in that, when satisfying the condition shown in formula (4), then think that reheat steam pressure measuring point continues overpressure; if RHPi(tnow-1)>=PA∨RHPi(tnow)>=PA (4)。if RHP i (t now-1 )>=PA∨RHP i (t now )>=PA (4). 7.根据权利要求2所述的实时计算高温再热蒸汽管道超压状态的方法,其特征在于,当满足式(5)所示条件时,则认为再热蒸汽压力测点超压结束;7. the method for calculating high temperature reheat steam pipeline overpressure state in real time according to claim 2, is characterized in that, when satisfying the condition shown in formula (5), then think that the overpressure of the reheat steam pressure measuring point ends; if RHPi(tnow-1)>=PA∨RHPi(tnow)<PA (5)。if RHP i (t now-1 )>=PA∨RHP i (t now )<PA (5). 8.根据权利要求2所述的实时计算高温再热蒸汽管道超压状态的方法,其特征在于,当前时刻tnow之前的各再热蒸汽压力测点的单次超压状态值Si(t):8. the method for calculating high temperature reheat steam pipeline overpressure state in real time according to claim 2, is characterized in that, the single overpressure state value S i (t of each reheat steam pressure measuring point before current time t now ):
Figure FDA0003662603650000031
Figure FDA0003662603650000031
其中,tstart为单次超压过程的超压开始时间,tend为单次超压过程的超压结束时间。Among them, t start is the overpressure start time of a single overpressure process, and tend is the overpressure end time of a single overpressure process.
9.根据权利要求2所述的实时计算高温再热蒸汽管道超压状态的方法,其特征在于,各再热蒸汽压力测点截至当前时刻tnow为止的累计超压状态值Si9. The method for calculating the overpressure state of high temperature reheat steam pipeline in real time according to claim 2, is characterized in that, the accumulated overpressure state value S i of each reheat steam pressure measuring point up to the current time t now :
Figure FDA0003662603650000032
Figure FDA0003662603650000032
其中,t0为计算最初时间。Among them, t 0 is the initial time of calculation.
10.根据权利要求2所述的实时计算高温再热蒸汽管道超压状态的方法,其特征在于,高温再热蒸汽管道截至当前时刻为止的累计超压状态值S为:10. the method for calculating the overpressure state of high temperature reheat steam pipeline in real time according to claim 2, is characterized in that, the accumulated overpressure state value S of high temperature reheat steam pipeline up to the current moment is: S=max{S1,S2,S3...,Si...,Sn} (8)。S=max{S 1 , S 2 , S 3 ..., S i ..., Sn } (8).
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