Method and system for adjusting opening degree of blades of induced draft fan in thermal power unit

Abstract

A method and system for adjusting the opening degree of blades of an induced draft fan in a thermal power unit. The method comprises: acquiring historical operation data of an air and flue gas system of a thermal power unit; establishing a coupling model between a pipeline characteristic model of the air and flue gas system and an operation characteristic model of an induced draft fan; determining a simulated opening degree of the induced draft fan, determining the simulated opening degree as an input parameter of the coupling model, and calculating a flow parameter and an operation state point of the induced draft fan at a current simulated opening degree by means of the coupling model; determining whether the flow parameter exceeds a flow threshold to trigger a flow warning signal, and determining whether the operation state point exceeds a surge curve to trigger a surge warning signal; and if the flow warning signal and the surge warning signal are not triggered, determining the simulated opening degree to be a target opening degree, calculating the operation efficiency of the induced draft fan at the target opening degree, and comparing the operation efficiency with the actual operation efficiency of the induced draft fan. A simulation test is performed on the opening degree of blades of an induced draft fan in a simulated mode, so that the continuous safe operation and operation efficiency of the induced draft fan after the opening degree of the blades is adjusted can be effectively ensured.

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