Method for judging property variation of thermal power plant on basis of statistical control technique
A thermal power unit and control technology technology, applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve the problems of inaccurate determination of performance changes, and achieve the effect of low cost and good effect
Active Publication Date: 2017-01-04
TSINGHUA UNIV
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[0005] The purpose of the present invention is to provide a thermal power unit component performance change judgment method based on statistical control technology, apply it to the online performance monitoring of thermal power unit key components, solve the problem of inaccurate judgment of thermal power unit key component performance changes, improve the key The effect of on-line performance monitoring of components
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Embodiment
[0067] Example: Carry out fault simulation analysis on the regenerative heating heat exchanger of the power plant.
[0068] 1) Taking the #1 high-pressure heater, a key component of a 330MW thermal power unit, as an example, the model of the dominant factor that follows the conservation of mass and energy and can reflect the heat transfer characteristics of the heat exchanger is established, and the characteristic curve of the heater is obtained as follows: figure 2 shown. Its input variables include feedwater flow rate D_w1(t), feedwater inlet pressure P_w1, feedwater inlet temperature T_w1, extraction steam inlet pressure P_s, and extraction steam inlet temperature T_s. The output variables include feedwater outlet temperature T_w2 and drain outlet temperature T_ss. Combining with the physical model and using the dominant factor modeling method to establish the full working condition model of the 1# high pressure heater, the healthy value of the feed water outlet temperatu...
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The invention discloses a method for judging property variation of a thermal power plant on the basis of a statistical control technique, and belongs to the technical field of thermal power plant fault diagnosis. The method comprises two parts, wherein the first part comprises the following steps: establishing an overall working condition mold of a key part of the thermal power plant, and calculating monitoring variable deviation; the second part comprises the following steps: studying and analyzing statistical digital characteristics of the monitoring variable deviation, establishing a controllable state judging basis of the characteristics of the key part of the thermal power plant according to the statistical digital characteristics of the monitoring variable deviation, completing design of a statistical control diagram, and recognizing sudden property variation and gradual change defaults of the part. Compared with a conventional thermal power plant property monitoring and default diagnosis technique, the fault judging method is capable of positioning defaults of parts, precise quantitative judgment bases can be provided, the accuracy of fault judgment can be effectively improved, and the wrong report rate and the false alarm ratio can be reduced.
Description
technical field [0001] The invention relates to a method for judging performance change of thermal power unit components based on statistical control technology, which belongs to the technical field of thermal power unit fault diagnosis. Background technique [0002] At present, my country's thermal power units still occupy a dominant position in my country's electric power production. The online performance monitoring technology of thermal power units has been widely studied and applied as a means to effectively improve the operating efficiency of units and ensure the safe operation of units. At present, there are mainly two methods for online performance monitoring of thermal power unit systems and equipment in China: the first method is based on data-driven methods, using a large amount of process data to establish equipment and system models for performance monitoring and diagnosis; The first method is to establish a model based on the physical mechanism, so as to calcul...
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Login to View More IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 刘培李政肖辉刘永鹏余孟亮郭思思
Owner TSINGHUA UNIV