CN114817835B - Real-time calculation method for three-level overrun safety risk of main steam pipeline pressure - Google Patents
Real-time calculation method for three-level overrun safety risk of main steam pipeline pressure Download PDFInfo
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Abstract
Description
技术领域Technical field
本发明属于火力发电行业技术领域,涉及一种主蒸汽管道压力三级超限安全风险的实时计算方法。The invention belongs to the technical field of the thermal power generation industry and relates to a real-time calculation method for the safety risk of three-level over-limit pressure of main steam pipelines.
背景技术Background technique
火力发电厂主蒸汽系统是将锅炉产生的蒸汽送入汽轮机做功,它是由从锅炉过热器出口联箱至汽轮机进口主汽阀的主蒸汽管道、阀门、疏水装置所组成。其中的主蒸汽管道是最重要的部件,作为火力发电厂四大管道之一,其重要性也是不言而喻的。The main steam system of a thermal power plant sends the steam generated by the boiler to the steam turbine to perform work. It is composed of the main steam pipeline, valves and drain devices from the boiler superheater outlet header to the turbine inlet main steam valve. The main steam pipeline is the most important component. As one of the four major pipelines in thermal power plants, its importance is self-evident.
由于火力发电机组的主蒸汽压力数值往往是大气压力的几百倍,例如超超临界机组,其数值能达到27MPa(是大气压力的270倍),考虑安全性,主蒸汽管道被设计为大尺寸厚壁部件,设计院和锅炉、汽机制造厂也会综合各种设计工况给出合适的设计运行压力,但是在服役过程中会因不稳定因素导致运行工况恶劣,造成主蒸汽管道超压运行。主蒸汽压力给主蒸汽管道带来轴向和周向的内压应力,特别是在超压运行时,在高温环境和大的内压应力环境下,会加速管道材料老化,而且在管材缺陷造成的应力集中、焊接造成的残余应力以及有微小裂纹缺陷的情况下,频繁的超压甚至是大幅度的超压运行,会放大应力集中或引发微小裂纹扩展导致失效事故发生,因此对主蒸汽管道进行超压运行监测甚至是多级超压运行监测是必要且重要的。Since the main steam pressure value of thermal power generating units is often hundreds of times the atmospheric pressure, for example, the value of ultra-supercritical units can reach 27MPa (270 times the atmospheric pressure). Considering safety, the main steam pipeline is designed to be large in size. For thick-walled components, design institutes and boiler and turbine manufacturers will also provide appropriate design operating pressures based on various design conditions. However, during service, unstable factors may lead to poor operating conditions, resulting in overpressure in the main steam pipeline. run. The main steam pressure brings axial and circumferential internal pressure stress to the main steam pipeline. Especially during overpressure operation, in high temperature environment and large internal pressure stress environment, it will accelerate the aging of pipeline materials and cause pipe defects. In the case of stress concentration, residual stress caused by welding, and micro-crack defects, frequent overpressure or even large-scale overpressure operation will amplify the stress concentration or cause micro-crack expansion to cause failure accidents. Therefore, it is harmful to the main steam pipeline. It is necessary and important to conduct overpressure operation monitoring and even multi-level overpressure operation monitoring.
为此,基于三级超压,提出了一种主蒸汽管道压力三级超限安全风险的实时计算方法,用压力三级超限安全风险值来表征主蒸汽管道的超压情况,方便运行人员特别关注主蒸汽压力的运行状况,有利于生产管理专业人加强主蒸汽管道的技术监督,并且为检修人员有针对性的制定检修计划提供参考。To this end, based on the three-level overpressure, a real-time calculation method for the safety risk of the three-level over-limit pressure of the main steam pipeline is proposed. The three-level pressure over-limit safety risk value is used to characterize the overpressure situation of the main steam pipeline, which is convenient for operators. Paying special attention to the operating status of the main steam pressure will help production management professionals strengthen the technical supervision of the main steam pipeline, and provide a reference for maintenance personnel to formulate targeted maintenance plans.
目前,仅有文献报道运用ANSYS有限元软件数值模拟,提出了主蒸汽管道弯管危险点的等效应力数学模型,如文献“基于可靠性理论的主蒸汽管道寿命预测,2008,华北电力大学(北京)”;也有文献报道对国内现行的超(超)临界机组主蒸汽管道设计压力取值规定进行分析,提出采用锅炉最大连续蒸发量(BMCR)工况下的工作压力作为设计压力,如文献“超(超)临界机组主蒸汽管道设计压力取值,2010(08)”。但针对火力发电厂主蒸汽管道压力三级超限安全风险的实时计算方法未见报道。At present, there are only reports in the literature that use ANSYS finite element software numerical simulation to propose an equivalent stress mathematical model of the dangerous point of the main steam pipeline bend, such as the literature "Main steam pipeline life prediction based on reliability theory, 2008, North China Electric Power University ( Beijing)"; there are also literature reports that analyze the current domestic regulations for the design pressure of the main steam pipeline of super (super) critical units, and propose that the working pressure under the boiler maximum continuous evaporation capacity (BMCR) condition be used as the design pressure, such as the literature "Design pressure value of main steam pipeline of super (super) critical unit, 2010(08)". However, there is no report on the real-time calculation method of the safety risk of level three pressure overrun in the main steam pipeline of thermal power plants.
发明内容Contents of the invention
本发明的目的在于克服上述现有技术的缺点,提供了一种主蒸汽管道压力三级超限安全风险的实时计算方法,该方法能够实时计算主蒸汽管道压力三级超限安全风险。The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a real-time calculation method for the safety risk of a three-level over-limit pressure in a main steam pipeline, which can calculate the safety risk of a three-level over-limit pressure in the main steam pipeline in real time.
为达到上述目的,本发明所述的主蒸汽管道压力三级超限安全风险的实时计算方法包括以下步骤:In order to achieve the above purpose, the real-time calculation method of the safety risk of three-level over-limit pressure of the main steam pipeline according to the present invention includes the following steps:
1)机组实时并网开关及机组实时发电功率在当前时刻ti的数值KG(ti)及MW(ti),计算当前时刻ti的机组运行状态SA(ti);获取机组实时并网开关以及机组实时发电功率在前一时刻ti-1的数值KG(ti-1)及MW(ti-1),计算前一时刻ti-1的机组运行状态SA(ti-1);1) Use the real-time grid-connected switch of the unit and the values KG(t i ) and MW(t i ) of the real-time generated power of the unit at the current time t i to calculate the operating status S A (t i ) of the unit at the current time t i; obtain the real-time value of the unit Calculate the unit operating status S A (t i-1 );
当(SA(ti)+SA(ti-1))≥1,则转至步骤2);When (S A (t i )+S A (t i-1 )) ≥ 1, go to step 2);
2)获取每个主蒸汽压力测点在前一时刻ti-1的数值MSPj(ti-1),计算各主蒸汽压力测点前一时刻ti-1的第k级超压状态SBk(ti-1);获取每个主蒸汽压力测点在当前时刻ti的数值MSPj(ti),计算各主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti);2) Obtain the value MSP j (t i -1 ) of each main steam pressure measuring point at the previous time t i- 1, and calculate the kth level overpressure state of each main steam pressure measuring point at the previous time t i-1 S Bk (t i-1 ); obtain the value MSP j (t i ) of each main steam pressure measuring point at the current time t i , and calculate the kth level overpressure state of each main steam pressure measuring point at the current time t i S Bk (t i );
3)根据各主蒸汽压力测点前一时刻ti-1的第k级超压状态SBk(ti-1)及各主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti)判断第k级超压是否发生;3) According to the k-th level overpressure state S Bk (t i-1 ) of each main steam pressure measuring point at the previous time t i-1 and the k-th level overpressure state of each main steam pressure measuring point at the current time t i S Bk (t i ) determines whether the kth level overpressure occurs;
4)当第k级超压发生时,根据第k级超压发生的时刻,计算当前时刻ti各主蒸汽压力测点的实时超压安全风险值Rjk(ti);4) When the kth level overpressure occurs, calculate the real-time overpressure safety risk value R jk (t i ) of each main steam pressure measuring point at the current time t i based on the time when the kth level overpressure occurs;
5)根据当前时刻ti各主蒸汽压力测点的实时超压安全风险值Rjk(ti)计算每个主蒸汽压力测点截至计算时刻为止的累计超压安全风险值Rj;5) Calculate the cumulative overpressure safety risk value R j of each main steam pressure measuring point up to the calculation time based on the real-time overpressure safety risk value R jk (t i ) of each main steam pressure measuring point at the current time ti ;
6)根据每个主蒸汽压力测点截至计算时刻为止的累计超压安全风险值Rj计算主蒸汽管道截至计算时刻为止的累计超压安全风险值R。6) Calculate the cumulative overpressure safety risk value R of the main steam pipeline as of the calculation time based on the cumulative overpressure safety risk value R j of each main steam pressure measuring point as of the calculation time.
步骤1)中,当前时刻ti的机组运行状态SA(ti)为:In step 1), the unit operating status S A (t i ) at the current time ti is:
前一时刻ti-1的机组运行状态SA(ti-1)为:The unit operating status S A (t i-1 ) at the previous time t i-1 is:
步骤2)中,各主蒸汽压力测点前一时刻ti-1的第k级超压状态SBk(ti-1)为:In step 2), the kth-level overpressure state S Bk (t i -1 ) of each main steam pressure measuring point at the previous time t i-1 is:
if MSPj(ti-1)≥LVk,SBk(ti-1)=1,else,SBk(ti-1)=0 (3)if MSP j (t i-1 ) ≥ LV k ,S Bk (t i-1 )=1, else, S Bk (t i-1 )=0 (3)
各主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti):The kth level overpressure state S Bk (t i ) of each main steam pressure measuring point at the current time t i :
if MSPj(ti)≥LVk,SBk(ti)=1,else,SBk(ti)=0 (4)if MSP j (t i )≥LV k ,S Bk (t i )=1,else,S Bk (t i )=0 (4)
当每个主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti)和前一时刻ti-1的第k级超压状态SBk(ti-1)满足式(5)所示条件时,则第k级超压未发生;When the kth-level overpressure state S Bk (t i ) of each main steam pressure measuring point at the current time t i and the k-th level overpressure state S Bk (t i-1 ) at the previous time t i-1 satisfy When the conditions shown in equation (5) are met, the kth level overpressure does not occur;
if SBk(ti-1)=0∨SBk(ti)=0 (5)if S Bk (t i-1 )=0∨S Bk (t i )=0 (5)
当每个主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti)和前一时刻ti-1的第k级超压状态SBk(ti-1)满足式(6)所示条件时,则第k级超压刚开始发生;When the kth-level overpressure state S Bk (t i ) of each main steam pressure measuring point at the current time t i and the k-th level overpressure state S Bk (t i-1 ) at the previous time t i-1 satisfy When the conditions shown in equation (6) are met, the kth level overpressure has just begun to occur;
if SBk(ti-1)=0∨SBk(ti)=1 (6)if S Bk (t i-1 )=0∨S Bk (t i )=1 (6)
当每个主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti)和前一时刻ti-1的第k级超压状态SBk(ti-1)满足式(7)所示条件时,则第k级超压在过程中;When the kth-level overpressure state S Bk (t i ) of each main steam pressure measuring point at the current time t i and the k-th level overpressure state S Bk (t i-1 ) at the previous time t i-1 satisfy When the conditions shown in equation (7) are met, the kth level overpressure is in the process;
if SBk(ti-1)=1∨SBk(ti)=1 (7)if S Bk (t i-1 )=1∨S Bk (t i )=1 (7)
当每个主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti)和前一时刻ti-1的第k级超压状态SBk(ti-1)满足式(8)所示条件时,则第k级超压将结束时:When the kth-level overpressure state S Bk (t i ) of each main steam pressure measuring point at the current time t i and the k-th level overpressure state S Bk (t i-1 ) at the previous time t i-1 satisfy When the conditions shown in equation (8) are met, the kth level overpressure will end:
if SBk(ti-1)=1∨SBk(ti)=0 (8)if S Bk (t i-1 )=1∨S Bk (t i )=0 (8)
当每个主蒸汽压力测点的第k级超压刚开始发生时,则主蒸汽压力测点的实时超压安全风险值Rjk(ti)为:When the kth level overpressure of each main steam pressure measuring point begins to occur, the real-time overpressure safety risk value R jk (t i ) of the main steam pressure measuring point is:
当每个主蒸汽压力测点的第k级超压在过程中时,则主蒸汽压力测点的实时超压安全风险值Rjk(ti)为:When the kth level overpressure of each main steam pressure measuring point is in process, the real-time overpressure safety risk value R jk (t i ) of the main steam pressure measuring point is:
当每个主蒸汽压力测点的第k级超压将结束时,则主蒸汽压力测点的实时超压安全风险值Rjk(ti)为:When the kth level overpressure of each main steam pressure measuring point will end, the real-time overpressure safety risk value R jk (t i ) of the main steam pressure measuring point is:
每个主蒸汽压力测点截至计算时刻为止的累计超压安全风险值Rj为:The cumulative overpressure safety risk value R j of each main steam pressure measuring point as of the calculation time is:
其中,tstart为累计超压安全风险值计算的初始时间,tnow为累计超压安全风险值计算当前时间。Among them, t start is the initial time for calculating the cumulative overpressure safety risk value, and t now is the current time for calculating the cumulative overpressure safety risk value.
计算主蒸汽管道截至计算时刻为止的累计超压安全风险值R为:Calculate the cumulative overpressure safety risk value R of the main steam pipeline up to the calculation time as:
其中,j表示主蒸汽管道有n个主蒸汽压力测点。Among them, j indicates that the main steam pipeline has n main steam pressure measuring points.
本发明具有以下有益效果:The invention has the following beneficial effects:
本发明所述的主蒸汽管道压力三级超限安全风险的实时计算方法在具体操作时,通过实时获取机组实时并网开关和机组实时发电功率进行机组运行条件筛选,实时获取主蒸汽压力测点值进行三级超压状态判断,根据超压状态进行对应的实时超压安全风险值计算,并以此为基础依次实现主蒸汽压力测点的累计超压安全风险值的实时计算以及主蒸汽管道的累计超压安全风险值的实时计算,通过超压安全风险值来表征主蒸汽管道的超压情况,为运行人员调整主蒸汽参数及相关联参数提供参考,为生产管理人员开展主蒸汽管道的技术监督提供支持,为检修人员有针对性的制定检修计划提供技术支撑。During specific operation, the real-time calculation method of the safety risk of the main steam pipeline pressure three-level overrun according to the present invention screen the operating conditions of the unit by obtaining the real-time grid connection switch of the unit and the real-time power generation of the unit in real time, and obtains the main steam pressure measuring point in real time. The value is used to judge the three-level overpressure status, and the corresponding real-time overpressure safety risk value calculation is performed based on the overpressure status. Based on this, the real-time calculation of the cumulative overpressure safety risk value of the main steam pressure measuring point and the main steam pipeline are realized in turn. Real-time calculation of the cumulative overpressure safety risk value, using the overpressure safety risk value to characterize the overpressure situation of the main steam pipeline, providing a reference for operators to adjust main steam parameters and related parameters, and for production management personnel to carry out inspections of main steam pipelines Provide technical supervision and provide technical support for maintenance personnel to formulate targeted maintenance plans.
附图说明Description of drawings
图1为本发明的流程图。Figure 1 is a flow chart of the present invention.
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 enable those skilled in the art to 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 in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only These are part of the embodiments of the present invention, not all of them, and are not intended to limit the scope of the disclosure of the present invention. Furthermore, 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 those of ordinary skill in the art without creative efforts should fall within the scope of protection 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。A schematic structural diagram according to a disclosed embodiment of the present invention is shown in the accompanying drawings. The drawings are not drawn to scale, with certain details exaggerated and may have been omitted for purposes of clarity. The shapes of the various regions and layers shown in the figures and the relative sizes and positional relationships between them are only exemplary. In practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art will base their judgment on actual situations. Additional regions/layers with different shapes, sizes, and relative positions can be designed as needed.
参考图1,本发明所述的主蒸汽管道压力三级超限安全风险的实时计算方法包括以下步骤:Referring to Figure 1, the real-time calculation method of the safety risk of the three-level overrun of main steam pipeline pressure according to the present invention includes the following steps:
1)确定计算对象1) Determine the calculation object
根据火力发电厂实际情况,计算对象为单台机组A侧或B侧的主蒸汽管道。According to the actual situation of the thermal power plant, the calculation object is the main steam pipe on side A or B of a single unit.
2)确定条件参数及计算参数2) Determine condition parameters and calculation parameters
条件参数为:机组实时并网开关KG、机组实时发电功率MW及机组装机容量MWDesign;The condition parameters are: the unit’s real-time grid connection switch KG, the unit’s real-time power generation MW and the unit’s installed capacity MW Design ;
计算参数为:主蒸汽压力MSP;The calculation parameters are: main steam pressure MSP;
当主蒸汽管道上存在多个主蒸汽压力测点时,用右下角标j区分,则每个测点值MSPj独立参与计算。When there are multiple main steam pressure measuring points on the main steam pipeline, they are distinguished by j in the lower right corner, and the value MSP j of each measuring point is independently involved in the calculation.
3)确定三级超压限值3) Determine the level three overpressure limit
所述三级超压限值分别为一级超压限值LVI、二级超压限值LVII及三级超压限值LVIII,其中,LVI<LVII<LVIII。The three-level overpressure limits are respectively the first-level overpressure limit LV I , the second-level overpressure limit LV II and the third-level overpressure limit LV III , where LV I < LV II < LV III .
为计算方便,将三级超压的每一级超压用右下角标k统一表示,三级超压限值表示为LVk。For the convenience of calculation, each level of overpressure of the three-level overpressure is uniformly represented by the subscript k in the lower right corner, and the limit value of the three-level overpressure is expressed as LV k .
4)开始计算并获取实时数据4) Start calculation and obtain real-time data
从当前时刻ti开始计算,从数据库中获取条件参数及计算参数,在转至步骤5);Start calculation from the current time t i , obtain the condition parameters and calculation parameters from the database, and then go to step 5);
5)机组持续运行条件判断5) Judgment of continuous operating conditions of the unit
获取条件参数机组实时并网开关及机组实时发电功率在当前时刻ti的数值KG(ti)及MW(ti),则当前时刻ti的机组运行状态SA(ti)为:Obtain the condition parameters KG(t i ) and MW(t i ) of the real-time grid-connected switch of the unit and the real-time generated power of the unit at the current time t i . Then the operating status S A (t i ) of the unit at the current time t i is:
获取条件参数机组实时并网开关以及机组实时发电功率在前一时刻ti-1的数值KG(ti-1)及MW(ti-1),其中,前一时刻ti-1的机组运行状态SA(ti-1)为:Obtain the condition parameters of the unit's real-time grid-connected switch and the unit's real-time power generation value KG (t i-1 ) and MW (t i-1 ) at the previous moment t i-1, where the unit's real-time power generation at the previous moment t i-1 The operating state S A (t i-1 ) is:
当(SA(ti)+SA(ti-1))≥1,机组持续运行,则转至步骤6),否则,则转至步骤4);When (S A (t i ) + S A (t i-1 )) ≥ 1, the unit continues to run, then go to step 6), otherwise, go to step 4);
6)三级超压状态判断6) Judgment of level three overpressure status
获取每个主蒸汽压力测点在前一时刻ti-1的数值MSPj(ti-1),计算各主蒸汽压力测点前一时刻ti-1的第k级超压状态SBk(ti-1)为:Obtain the value MSP j (t i-1 ) of each main steam pressure measuring point at the previous time t i-1, and calculate the k-th level overpressure state S Bk of each main steam pressure measuring point at the previous time t i-1 (t i-1 ) is:
if MSPj(ti-1)≥LVk,SBk(ti-1)=1,else,SBk(ti-1)=0 (3)if MSP j (t i-1 ) ≥ LV k ,S Bk (t i-1 )=1, else, S Bk (t i-1 )=0 (3)
获取每个主蒸汽压力测点在当前时刻ti的数值MSPj(ti),计算各主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti):Obtain the numerical value MSP j (t i ) of each main steam pressure measuring point at the current time t i , and calculate the k-th level overpressure state S Bk (t i ) of each main steam pressure measuring point at the current time t i :
if MSPj(ti)≥LVk,SBk(ti)=1,else,SBk(ti)=0 (4)if MSP j (t i )≥LV k ,S Bk (t i )=1,else,S Bk (t i )=0 (4)
当每个主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti)和前一时刻ti-1的第k级超压状态SBk(ti-1)满足式(5)所示条件时,则第k级超压未发生,则转至步骤4);When the kth-level overpressure state S Bk (t i ) of each main steam pressure measuring point at the current time t i and the k-th level overpressure state S Bk (t i-1 ) at the previous time t i-1 satisfy When the conditions shown in equation (5) are met, then the kth level overpressure does not occur, then go to step 4);
if SBk(ti-1)=0∨SBk(ti)=0 (5)if S Bk (t i-1 )=0∨S Bk (t i )=0 (5)
当每个主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti)和前一时刻ti-1的第k级超压状态SBk(ti-1)满足式(6)所示条件时,则第k级超压刚开始发生,则转至步骤71);When the kth-level overpressure state S Bk (t i ) of each main steam pressure measuring point at the current time t i and the k-th level overpressure state S Bk (t i-1 ) at the previous time t i-1 satisfy When the conditions shown in equation (6) are met, the kth level overpressure has just begun to occur, then go to step 71);
if SBk(ti-1)=0∨SBk(ti)=1 (6)if S Bk (t i-1 )=0∨S Bk (t i )=1 (6)
当每个主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti)和前一时刻ti-1的第k级超压状态SBk(ti-1)满足式(7)所示条件时,则第k级超压在过程中,则转至步骤72);When the kth-level overpressure state S Bk (t i ) of each main steam pressure measuring point at the current time t i and the k-th level overpressure state S Bk (t i-1 ) at the previous time t i-1 satisfy When the conditions shown in equation (7) are met, then the kth level overpressure is in process, then go to step 72);
if SBk(ti-1)=1∨SBk(ti)=1 (7)if S Bk (t i-1 )=1∨S Bk (t i )=1 (7)
当每个主蒸汽压力测点在当前时刻ti的第k级超压状态SBk(ti)和前一时刻ti-1的第k级超压状态SBk(ti-1)满足式(8)所示条件时,则第k级超压将结束时,则转至步骤73):When the kth-level overpressure state S Bk (t i ) of each main steam pressure measuring point at the current time t i and the k-th level overpressure state S Bk (t i-1 ) at the previous time t i-1 satisfy When the conditions shown in equation (8) are met, when the kth level overpressure will end, go to step 73):
if SBk(ti-1)=1∨SBk(ti)=0 (8)if S Bk (t i-1 )=1∨S Bk (t i )=0 (8)
7)主蒸汽压力测点的实时超压安全风险值计算7) Calculation of real-time overpressure safety risk value of main steam pressure measuring point
针对不同的第k级超压状态,根据每个主蒸汽压力测点在当前时刻ti的数值MSPj(ti)和在前一时刻ti-1的数值MSPj(ti-1)以及三级超压限值LVk,计算当前时刻ti每个主蒸汽压力测点的实时超压安全风险值,具体为:For different k-th level overpressure states, according to the value MSP j (t i ) of each main steam pressure measuring point at the current time t i and the value MSP j (t i-1 ) at the previous time t i- 1 As well as the third-level overpressure limit LV k , calculate the real-time overpressure safety risk value of each main steam pressure measuring point at the current time t i , specifically as follows:
7-1)当每个主蒸汽压力测点的第k级超压刚开始发生时,则主蒸汽压力测点的实时超压安全风险值Rjk(ti)为:7-1) When the kth level overpressure of each main steam pressure measuring point begins to occur, the real-time overpressure safety risk value R jk (t i ) of the main steam pressure measuring point is:
7-2)当每个主蒸汽压力测点的第k级超压在过程中时,则主蒸汽压力测点的实时超压安全风险值Rjk(ti)为:7-2) When the kth level overpressure of each main steam pressure measuring point is in process, the real-time overpressure safety risk value R jk (t i ) of the main steam pressure measuring point is:
7-3)当每个主蒸汽压力测点的第k级超压将结束时,则主蒸汽压力测点的实时超压安全风险值Rjk(ti)为:7-3) When the kth level overpressure of each main steam pressure measuring point will end, the real-time overpressure safety risk value R jk (t i ) of the main steam pressure measuring point is:
8)主蒸汽压力测点的累计超压安全风险值实时计算8) Real-time calculation of the cumulative overpressure safety risk value of the main steam pressure measuring point
根据每个主蒸汽压力测点在当前时刻ti的实时超压安全风险值Rjk(ti),计算每个主蒸汽压力测点截至计算时刻为止的累计超压安全风险值Rj为:According to the real-time overpressure safety risk value R jk (t i ) of each main steam pressure measuring point at the current time t i , the cumulative overpressure safety risk value R j of each main steam pressure measuring point up to the calculation time is calculated as:
其中,tstart为累计超压安全风险值计算的初始时间,tnow为累计超压安全风险值计算当前时间。Among them, t start is the initial time for calculating the cumulative overpressure safety risk value, and t now is the current time for calculating the cumulative overpressure safety risk value.
9)主蒸汽管道的累计超压安全风险值实时计算9) Real-time calculation of the cumulative overpressure safety risk value of the main steam pipeline
根据每个主蒸汽压力测点截至计算时刻为止的累计超压安全风险值Rj,计算主蒸汽管道截至计算时刻为止的累计超压安全风险值R为:According to the cumulative overpressure safety risk value R j of each main steam pressure measuring point as of the calculation time, the cumulative overpressure safety risk value R of the main steam pipeline as of the calculation time is calculated as:
其中,j表示主蒸汽管道有n个主蒸汽压力测点。Among them, j indicates that the main steam pipeline has n main steam pressure measuring points.
在每个主蒸汽压力测点截至计算时刻为止的累计超压安全风险值和主蒸汽管道截至计算时刻为止的累计超压安全风险值实时计算完成,将数据写入数据库,结束本轮实时计算,转入4)开始新一轮实时计算。The real-time calculation of the cumulative overpressure safety risk value at each main steam pressure measuring point as of the calculation time and the cumulative overpressure safety risk value of the main steam pipeline as of the calculation time is completed, and the data is written into the database, ending this round of real-time calculation. Go to 4) to start a new round of real-time 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 embodiment is only one of the ways to realize the technical solution of the present invention. The scope of protection claimed by the present invention is not only limited by this embodiment, but also includes any technical scope disclosed by the present invention. Changes, substitutions and other implementations may be easily imagined by those skilled in the art.
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