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- W2545342930 abstract "Coal mill malfunctions are some of the most common causes of failing to keep the power plant crucial operating parameters or even unplanned power plant shutdowns. Therefore, an algorithm has been developed that enable on-line detection of abnormal conditions and malfunctions of an operating mill. Based on calculated diagnostic signals and defined thresholds, this algorithm informs about abnormal operating conditions. Diagnostic signals represent the difference between the measured and modeled value of two selected mill operating parameters. Models of mill motor current and outlet temperature of pulverized fuel were developed based on the linear regression theory. Various data analyses and feature selection procedures have been performed to obtain the best possible model. The model based on linear regression has been compared with two alternative models. The first was based on an artificial neural network and the second was based on physical equations with the use of a genetic algorithm to determine the unknown model coefficients. The algorithm validation was carried out based on historical data containing values of operating parameters from 10 months of mill operation. Historical data was downloaded from DCS system of a 200 MW coal-fired power plant. In this data set failures occurred six times causing unplanned mill shutdowns. Tests carried out on historical data show that this algorithm can be successfully used to detect certain abnormal conditions and malfunctions of the operating mill, such as: feeder blockage, lack of coal, mill overload." @default.
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- W2545342930 date "2018-05-02" @default.
- W2545342930 modified "2023-10-03" @default.
- W2545342930 title "Detection of Malfunctions and Abnormal Working Conditions of a Coal Mill" @default.
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- W2545342930 doi "https://doi.org/10.5772/intechopen.72952" @default.
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