Back pressure anomaly detection method for air cooling unit

Abstract

The invention relates to a back pressure anomaly detection method for an air cooling unit. Working condition division and an OPTICS clustering algorithm are combined to perform synchronous clustering on historical operation data of key characteristic variables influencing air cooling unit back pressure, and a class of samples with the lowest power supply coal consumption rate are selected as decision samples for unit back pressure anomaly detection; a k-nearest neighbor probability density estimation method is used for estimating probability density distribution of the unit back pressure in the decision samples, and a normal threshold interval of the air cooling unit back pressure under each working condition is determined; a back pressure prediction model of the air cooling unit is constructed by the aid of a gating circulation unit algorithm; and in combination with a sliding window detection technology, whether the predicted value of the back pressure is within a normal threshold interval is judged, and abnormal detection of the unit back pressure is realized. By means of the back pressure anomaly detection method for the air cooling unit, accurate unit back pressure anomaly early warning information can be provided, and energy-saving optimized operation of the cold end of the air cooling unit can be achieved in an auxiliary mode.

Description

technical field [0001] The invention belongs to the technical field of energy-saving optimization of coal-fired power units, and in particular relates to a method for detecting abnormal back pressure of an air-cooling unit. Background technique [0002] The back pressure of the air-cooled unit determines the final parameters of the thermodynamic cycle of the unit, which will directly affect the efficiency of the thermodynamic cycle, and then affect the coal consumption rate of the unit for power supply. Although reducing the back pressure can increase the ideal specific enthalpy drop of the steam turbine and increase the output power, the reduction of the back pressure of the air-cooled unit is mainly achieved by increasing the output of the air-cooled island fan. Therefore, to determine the appropriate back pressure of the unit, it is necessary to A balance should be sought between the increase in generating power of the unit and the increase in power consumption of the air...

AI Technical Summary

Problems solved by technology

However, most of these methods are calculated for one or several typical working conditions, and some simplified assumptions need to be made. Affected by the accuracy of the model, the calculated optimal back pressure is a theoretical value, which is subject to certain restrictions in engineering applications. limits

[0004] Affected by new energy power generation, most of the coal-fired power units in active service need to undertake the task of peak regulation, the load changes frequently, and the operating parameters will fluctuate accordingly and deviate from the design value, resulting in an increase in unit energy consumption

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