A method for detecting abnormal back pressure of air-cooled unit

Abstract

The invention relates to a method for detecting abnormal back pressure of an air-cooling unit. Combined with the division of working conditions and the OPTICS clustering algorithm, the historical operation data of key characteristic variables affecting the back pressure of the air-cooling unit are synchronously clustered, and a class of samples with the lowest coal consumption rate for power supply is selected. As a decision sample for abnormal detection of unit back pressure; k ‑The nearest neighbor probability density estimation method, which estimates the probability density distribution of the unit back pressure in the decision sample, and determines the normal threshold range of the back pressure of the air-cooled unit under various working conditions; uses the gated cycle unit algorithm to construct the air-cooled unit back pressure prediction model; The sliding window detection technology determines whether the predicted value of the back pressure is within the normal threshold range, and realizes the abnormal detection of the unit back pressure. The method for detecting abnormal back pressure of an air-cooling unit proposed by the invention can provide accurate early warning information of abnormal back pressure of the unit, and assist in realizing the energy-saving and optimal operation of the cold end of the air-cooling unit.

Description

technical field [0001] The invention belongs to the technical field of energy-saving optimization of coal-fired power units, in particular 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, which in turn affects 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 unit back pressure, it is necessary to Seek a balance between the incremental power generation of the unit and the incremental power consumption of the air-cooling fan. At the sam...

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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