Early warning method and device for leakage accident of furnace tube of thermal power plant

Abstract

The invention discloses a thermal power plant furnace tube leakage accident early warning method and device. The thermal power plant furnace tube leakage accident early warning method comprises the steps that S1, furnace tube prediction models based on ridge regression algorithm linear fitting working conditions and furnace tube temperature data are called; s2, utilizing the model to predict the temperature of the furnace tube in real time, wherein the input of the model is real-time time sequence working condition data; the output of the model is furnace tube time sequence temperature data predicted according to the time sequence working condition data; and S3, fuzzy threshold alarm: when the average value of the difference values of the real-time timing sequence temperature data of the furnace tube and the timing sequence temperature data predicted by the prediction model is greater than a first threshold value and the average value of the difference values of the real-time timing sequence temperature data of the adjacent furnace tube and the real-time timing sequence temperature data of the current furnace tube is greater than a second threshold value, performing fuzzy threshold alarm. And early warning of a furnace tube leakage accident is carried out. The boiler four-tube wall temperature fuzzy threshold model early warning method based on time correlation and spatial correlation is provided for the first time, and the method has the advantages of being high in accident recognition accuracy and long in accident early warning time.

Description

technical field [0001] The invention relates to the field of thermal power generation safety monitoring, in particular to an early warning method and device for furnace tube leakage accidents in thermal power plants. Background technique [0002] Thermal power generation is the main source of electricity in my country. The installed capacity of thermal power units in the country is very large. According to statistics, there are currently more than 2,000 installed thermal power units in the country. Boilers are one of the important equipment of thermal power plants. The "four tubes" of the boiler refer to the boiler water wall, superheater, reheater and economizer. The four tubes of the boiler cover all the heating surfaces of the boiler. They are subjected to steam pressure and some chemical components inside, and high temperature outside. , Erosion and wear environment, reconcile between water and fire, is where the energy transfer is concentrated, long-term exposure to ve...

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Problems solved by technology

[0009] (1) Insufficient accuracy

When the traditional method checks the average air temperature at the interface, when calculating the convective heat transfer and radiation heat transfer between the check pipe sections, it does not fully consider the different heat absorption capacity of each pipe section.

[0010] (2) The theoretical calculation principle is complex and the threshold for use is high

[0012] The over-temperature and over-limit alarm based on the fixed temperature threshold cannot give early warning, the furnace tube is already at a dangerous temperature, and the alarm can only be issued, and the working conditions cannot be distinguished, the alarm has hysteresis, cannot be prevented, and has no fault classification ability. Abnormal equipment, high false alarm rate

[0013] The early warning of the vibration signal based on the acoustic wave sensor is mainly to detect the vibration signal of the furnace tube early leakage. It is a detection method for the early state of the accident that the furnace tube leakage accident has already occurred. Short time for on-site specialists to deal with accidents

[0014] This shows that the above-mentioned existing pre-warning method and device of thermal power plant furnace tube leakage accident obviously still have inconvenience and defect, and urgently need to be further improved

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