Fusion Diagnosis of the Combustion Stability Based on D-S Evidence Theory
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Abstract
Combined with the judgment logic of combustion stability of existing FSSS system, a combustion stability discrimination method based on D-S (Dempster-Shafer) evidential theory was proposed for boiler combustion instability in power plant. This paper discussed the combustion conditions under different conditions of the flame, used the four flame monitoring signals of the single-layer burner combined with the size of the coal-to-air ratio and the fire signals of adjacent layers to establish a typical sample. It took typical sample as comparable data and computed the confidence density of ignition goal pattern and fire extinguishing goal pattern, then carried on normalized processing to the typical sample to obtain the confidence function distribution. In this paper, in a period of time within a layer of burner 4 fire monitoring signals, air-coal ratios and the adjacent layer of flames were selected as evidence, and combined with the typical sample database, the reliability function distribution and uncertainty of the evidence in each goal pattern were calculated. D-S joint rules were used to fuse the data to judge the combustion stability. The experimental result shows that the method is effective, and can not only improve the accuracy of the judgment result, but also reduce the subjectivity in the process of construction of reliability function, which is convenient for engineering application.
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