Why does the primary dust removal fan of converter surge?

That's too general. Are you sure that the shaft vibration is not caused by the loss of dynamic balance of the fan impeller or the damage of the bearing bush? Or because the washing water is full? After reading your supplement, I think there are only two situations. First, there is something wrong with the piston of the gas holder. Second, there is something wrong with the water seal check valve or the three-way valve. Personally, I think the problem of gas holder is bigger. Or the wind pressure of the converter primary fan is not enough.