Troublesome problems of C12-35/10 type steam turbine No.3 in the first-phase project of thermal power plant under Shanxi Branch Company of China Aluminium Co Ltd

such as large steam leakage from shaft-packing

unsmoothly clogging of rotary diaphragm

high pressure appeared before the rotary diaphragm and after the secondary pressure stage under pure condensing operation

as well as the unit can not be operating under full load etc.

have been analysed

the reasonable retrofitting scheme being put forward

and being implemented during major repair

achieving remarkable success.