Abstract: Abstract:The practical problems encountered in site were analyzed. Combining with the fault treatment experiences, under normal operation condition of the axial flow fan with adlustable rotor blade, the output feedback structure of the hydraulic cylinder of the axial flow fan with adjustable rotor blade was improved and optimized. After the improvement, various hidden troubles of the fan, which may cause high fault rate of the fan cylinder, were eliminated thoroughly, the fan outage accident and the MFT accident were avoided, and the operational reliability and stability of the boiler air flue gas system of the power unit were improved effectively.

Key words: Keywords:axial flow fan with adjustable rotor blade, hydraulic cylinder, feedback structure, improveent research