Analysis of induced draft fan blade fracture accident of a 600 MW unit
A blade fracture accident occurred during the operation of a boiler induced draft fan in a power plant after capacity expansion and renovation.In order to study the main causes of blade fatigue fracture,the current blade structure was analyzed.Large blade torsion angles are prone to local stall,leading to strong vibration of weak blades;In addition,fan performance and vibration tests were conducted,and the current fan selection is too large,which exacerbates the local stall situation and generates large blade passing frequency vibration;In order to further study the stress situation of the fan blades,a model was established for the fan impeller and finite element analysis calculations were carried out.Currently,the strengthening ring is at the stress concentration position,providing guidance for improving the blade type.
induced draft fanblade brokenstiffening ringpower plantpassing frequency
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