Abnormal Current Fluctuation Detection of Boiler Air Preheater in 1000 MW Units
In order to improve the operational stability of boiler air preheater,a method for detecting abnormal current fluctuations of boiler air preheater of a 1000 MW unit was studied.The air preheater of the 33.5VNT2600 three part rota-ry 1000 MW unit boiler was taken as the object,and its current fluctuation related parameters during operation were measured to achieve abnormal detection.From the analysis of the current fluctuation period of 2A air preheater,the gap between axial sealing flake and sealing plate at certain angles might be too small.As the temperature difference between cold and hot ends of the air preheater increased,the mushroom-shape deformation of the rotor intensified,causing friction when rotating to the relevant position,which in turn triggered current fluctuations.By taking effective measures based on the detection results to deal with abnormal current fluctuations in the air preheater,the hot-to-cold-end temperature gradi-ent of the 2A unit rotor was effectively reduced,and the mushroom-shape deformation of the rotor was suppressed.
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